U.S. patent application number 17/738091 was filed with the patent office on 2022-08-18 for floor cleaning machine and method for operating a floor cleaning machine.
The applicant listed for this patent is ALFRED KARCHER SE & CO. KG. Invention is credited to Alexander BRANDLE, Alexander GILICH, Stefan GRABANT, Pascal NUDING, Frieder SCHMUCKLE.
Application Number | 20220257079 17/738091 |
Document ID | / |
Family ID | 1000006365834 |
Filed Date | 2022-08-18 |
United States Patent
Application |
20220257079 |
Kind Code |
A1 |
SCHMUCKLE; Frieder ; et
al. |
August 18, 2022 |
FLOOR CLEANING MACHINE AND METHOD FOR OPERATING A FLOOR CLEANING
MACHINE
Abstract
A floor cleaning machine is provided, comprising a suction unit
device, a suction bar which is operatively connectable, or
operatively connected, to the suction unit device for fluid
communication therewith, a holder which releasably holds the
suction bar, a fixing device for releasably fixing the suction bar
at the holder, and an overload protection device which is
associated with the suction bar, wherein the overload protection
device comprises at least one rotational bearing by way of which
the suction bar is rotatable at the holder relative to the holder
when an overload situation occurs.
Inventors: |
SCHMUCKLE; Frieder;
(Winnenden, DE) ; GILICH; Alexander; (Winnenden,
DE) ; GRABANT; Stefan; (Winnenden, DE) ;
NUDING; Pascal; (Winnenden, DE) ; BRANDLE;
Alexander; (Winnenden, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ALFRED KARCHER SE & CO. KG |
Winnenden |
|
DE |
|
|
Family ID: |
1000006365834 |
Appl. No.: |
17/738091 |
Filed: |
May 6, 2022 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2019/080603 |
Nov 7, 2019 |
|
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17738091 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47L 11/30 20130101;
A47L 11/4044 20130101; A47L 11/4002 20130101; A47L 11/4052
20130101 |
International
Class: |
A47L 11/40 20060101
A47L011/40; A47L 11/30 20060101 A47L011/30 |
Claims
1. Floor cleaning machine, comprising: a suction unit device; a
suction bar which is operatively connectable, or operatively
connected, to the suction unit device for fluid communication
therewith; a holder which releasably holds the suction bar; a
fixing device for releasably fixing the suction bar at the holder;
and an overload protection device which is associated with the
suction bar; wherein the overload protection device comprises at
least one rotational bearing by way of which the suction bar is
rotatable at the holder relative to the holder when an overload
situation occurs.
2. Floor cleaning machine in accordance with claim 1, wherein the
at least one rotational bearing has an axis of rotation with at
least one of the following: the axis of rotation is transverse to a
plane of support of the suction bar on a floor to be cleaned; the
axis of rotation is transverse to a wheel axis of the floor
cleaning machine; the axis of rotation is in spaced relation to a
central plane of the suction bar, which central plane lies between
a first end face and a second end face of the suction bar, relative
to a fixing position of the suction bar at the holder; the axis of
rotation is oriented at least approximately parallel to a central
plane which lies between a first end face and a second end face of
the suction bar, relative to a fixing position of the suction bar
at the holder.
3. Floor cleaning machine in accordance with claim 2, wherein the
at least one rotational bearing, relative to a fixing position of
the suction bar at the holder, is at least one of (i) in spaced
relation to a port for a suction conduit that is arranged at the
suction bar, and (ii) in spaced relation to a central plane of the
suction bar which lies between a first end face and a second end
face of the suction bar.
4. Floor cleaning machine in accordance with claim 1, wherein at
least a first rotational bearing and a second rotational bearing
are provided, which second rotational bearing is in spaced relation
to the first rotational bearing, with at least one of the
following: a first axis of rotation of the first rotational bearing
and a second axis of rotation of the second rotational bearing are
at least approximately parallel to one another; a central plane of
the suction bar which lies between a first end face and a second
end face of the suction bar, lies between the first rotational
bearing and the second rotational bearing, relative to a fixing
position of the suction bar at the holder; the first rotational
bearing and the second rotational bearing are in a
mirror-symmetrical arrangement about a central plane which lies
between a first end face end and a second end face end of the
suction bar; a port for a suction conduit at the suction bar is
located between the first rotational bearing and the second
rotational bearing, relative to a fixing position of the suction
bar at the holder.
5. Floor cleaning machine in accordance with claim 1, wherein the
suction bar comprises a support region for the holder and the
holder comprises a contact region for the support region of the
suction bar.
6. Floor cleaning machine in accordance with claim 5, wherein the
support region has a planar contact surface.
7. Floor cleaning machine in accordance with claim 5, wherein the
at least one rotational bearing comprises a wall which is arranged
at the support region of the suction bar, wherein the wall defines
a receptacle, and the at least one rotational bearing comprises a
counter element which is arranged at the contact region of the
holder, wherein, in a fixing position of the suction bar at the
holder, the counter element is positioned in the receptacle.
8. Floor cleaning machine in accordance with claim 7, wherein at
least one of the following is provided: the receptacle is closed
towards the support region of the suction bar; the receptacle is
open in a direction away from the support region; the receptacle is
bounded by the wall in a direction away from the holder with
respect to a fixing position of the suction bar at the holder; the
receptacle is open towards the holder with respect to a fixing
position of the suction bar at the holder; the wall has an arcuate
shape; the wall extends in an angular range of at most 180.degree.;
the wall has a height (H) of no more than 5 cm.
9. Floor cleaning machine in accordance with claim 7, wherein at
least one of the following is provided: the counter element has an
arcuate shape on an end face that faces towards the wall; the
counter element is formed as a finger; the counter element is of
planar configuration on an underside thereof facing towards the
support region of the suction bar; the counter element is of planar
configuration on an upper side thereof facing away from the
underside; a height of the counter element between an upper side
and an underside is no more than 2 cm.
10. Floor cleaning machine in accordance with claim 7, wherein the
counter element bounds an indentation at the holder, with at least
one of the following: a fastening element of the suction bar is
positioned in the indentation when the suction bar is in a fixing
position at the holder; the indentation has an arcuate boundary;
the indentation is bounded by a web on a side thereof facing away
from the counter element.
11. Floor cleaning machine in accordance with claim 1, wherein at
least one tab is arranged at the suction bar for connection to the
holder.
12. Floor cleaning machine in accordance with claim 1, wherein at
least one tab is arranged at the suction bar for connection to the
holder, and wherein the at least one tab is formed as a hand grip
for holding the suction bar.
13. Floor cleaning machine in accordance with claim 11, wherein the
at least one tab is formed as a hoop.
14. Floor cleaning machine in accordance with claim 11, wherein the
at least one tab is centrally arranged with respect to outer end
faces of the suction bar.
15. Floor cleaning machine in accordance with claim 11, wherein the
holder comprises a holder receptacle for the at least one tab,
wherein the at least one holder receptacle is configured for
providing support to the tab.
16. Floor cleaning machine in accordance with claim 15, wherein at
least one of the following is provided: the holder receptacle is
configured for providing support to the at least one tab downwardly
towards a floor to be cleaned; the holder receptacle is configured
for providing support to the at least one tab upwardly in a
direction away from a floor to be cleaned; the holder receptacle is
open on an insertion side; the holder receptacle has associated
therewith an insertion ramp on an insertion side.
17. Floor cleaning machine in accordance with claim 15, wherein the
holder comprises a contact region and the suction bar comprises a
support region for the contact region, wherein the contact region
is in spaced relation to the holder receptacle for the at least one
tab.
18. Floor cleaning machine in accordance with claim 1, wherein a
housing box is arranged at the holder, to which housing box is
connected a suction conduit, and wherein the housing box, in a
fixing position of the suction bar at the holder, is positioned
over a port for a suction conduit at the suction bar.
19. Floor cleaning machine in accordance with claim 18, wherein at
least one of the following is provided: the housing box comprises a
support surface for the suction bar; the port for a suction conduit
at the suction bar has an inclined surface at which a port mouth is
positioned; the housing box is in spaced relation to at least one
engagement region of the fixing device; a holder receptacle for at
least one tab of the suction bar for fixing the suction bar at the
holder is arranged in the region of the housing box; the holder
receptacle is spaced in height from the housing box; in a fixing
position of the suction bar at the holder, operative connection and
fluid communication between a suction conduit and a port for a
suction conduit at the suction bar is established; the holder
receptacle conforms to the at least one tab such that, when the
suction bar is fixed at the holder with the at least one tab
received in the holder receptacle, the holder is automatically
positioned relative to the suction bar such that the at least one
rotational bearing is formed.
20. Floor cleaning machine in accordance with claim 1, wherein the
fixing device is configured such that in a fixing position of the
suction bar at the holder, a force-locking connection exists
between the holder and the suction bar.
21. Floor cleaning machine in accordance with claim 1, wherein the
fixing device is configured such that in a fixing position of the
suction bar at the holder, a form-locking connection exists between
the holder and the suction bar.
22. Floor cleaning machine in accordance with claim 1, wherein the
fixing device is configured such that in a fixing position of the
suction bar at the holder, a form-locking connection exists between
the holder and the suction bar, and exists in addition to a
force-locking connection.
23. Floor cleaning machine in accordance with claim 20, wherein the
fixing device comprises at least one clamping element which is
arranged at the suction bar and via which the holder is clampable
against the suction bar.
24. Floor cleaning machine in accordance with claim 23, wherein the
suction bar comprises a support region for the holder and the
holder comprises a contact region for the support region of the
suction bar, and wherein the at least one clamping element is
configured such that the contact region of the holder is clampable
between the support region and the at least one clamping
element.
25. Floor cleaning machine in accordance with claim 23, wherein at
least one of the following is provided: the at least one clamping
element is formed as a clamping lever; the at least one clamping
element comprises a pivot element which has a clamping surface and
which is pivotably mounted on a bearing element; a bearing element
of the at least one clamping element is mounted for displacement on
the suction bar; a direction of displacement of the bearing element
is oriented transversely to a pivot axis of the pivot element; the
bearing element is supported on the suction bar via a spring
device; a spring force of the spring device in a clamping position
of the at least one clamping element exerts a clamping force for
fixing the holder and the suction bar together in a form-locking
manner; at least one of the direction of displacement of the
bearing element and a direction of force of the spring device is
oriented at least approximately parallel to an axis of rotation of
the at least one rotational bearing.
26. Floor cleaning machine in accordance with claim 23, wherein at
least a first clamping element and a second clamping element are
provided, the second clamping element being in spaced relation to
the first clamping element, with at least one of the following: the
first clamping element and the second clamping element are arranged
outside of a central plane of the suction bar which lies between a
first end face and a second end face of the suction bar; the first
clamping element and the second clamping element have mirror
symmetry about a central plane of the suction bar which lies
between a first end face and a second end face; a port for a
suction conduit is positioned between the first clamping element
and the second clamping element; the first clamping element and the
second clamping element are located between a first rotational
bearing and a second rotational bearing.
27. Floor cleaning machine in accordance with claim 21, wherein the
fixing device comprises at least one first form-locking element
which is arranged at the suction bar, and at least one second
form-locking element which corresponds to the first form-locking
element and is arranged at the holder.
28. Floor cleaning machine in accordance with claim 27, wherein the
at least one first form-locking element and the at least second
form-locking element are arranged and configured such that, in a
fixing position of the suction bar at the holder, when a
force-locking connection is established between the suction bar and
the holder, a form-locking connection with the at least one first
form-locking element and the at least one second form-locking
element is also established.
29. Floor cleaning machine in accordance with claim 28, wherein the
at least one first form-locking element is arranged at a support
region of the suction bar for the holder.
30. Floor cleaning machine in accordance with claim 27, wherein the
at least one first form-locking element and the at least one second
form-locking element are configured to conform to one another such
that, in a fixing position of the suction bar at the holder, a
movement of the suction bar away from the holder in a blocking
direction is blocked by a form lock, with at least one of the
following: the blocking direction is at least approximately
parallel to a plane of support of the suction bar on a floor to be
cleaned; the blocking direction is at least approximately parallel
to a direction of insertion of at least one tab of the suction bar
into a holder receptacle of the holder; the blocking direction is
transverse to an axis of rotation of the at least one rotational
bearing; the blocking direction is at least approximately parallel
to a chassis axis of the cleaning machine; the blocking direction
is at least approximately parallel to a support region of the
suction bar for the holder; the blocking direction is transverse to
a wheel axis; the blocking direction is a unidirectional direction
away from the holder.
31. Floor cleaning machine in accordance with claim 27, wherein,
when a sufficiently large force is applied to the suction bar, the
at least one second form-locking element is releasable from the at
least one first form-locking element.
32. Floor cleaning machine in accordance with claim 27, wherein the
at least one first form-locking element is formed by an elevation
at the suction bar and wherein the at least one second form-locking
element is a nose at the holder.
33. Floor cleaning machine in accordance with claim 27, wherein the
at least one second form-locking element has a blocking region for
the at least one first form-locking element, with which blocking
region the second form-locking element is in contact against the
first form-locking element when in a form-locking connection, and
wherein the at least one second form-locking element has an
inclined plane for overriding the at least one first form-locking
element.
34. Floor cleaning machine in accordance with claim 1, wherein in
an overload event, the suction bar at least one of (i) rotates
relative to the holder and (ii) falls off the holder.
35. Floor cleaning machine in accordance with claim 1, wherein a
checking device is provided to check for blockage at a suction
path.
36. Floor cleaning machine in accordance with claim 35, wherein at
least one pressure sensor is provided which is arranged at the
suction path.
37. Floor cleaning machine in accordance with claim 36, wherein the
pressure sensor is arranged at a pressure conduit which is
connectable, or is connected, to the suction bar.
38. Floor cleaning machine in accordance with claim 37, wherein a
port for a suction conduit at the suction bar comprises a port for
the pressure conduit.
39. Floor cleaning machine in accordance with claim 37, wherein the
pressure conduit is connected to a suction conduit.
40. Floor cleaning machine, comprising: a chassis; a suction unit
device; a suction bar which is operatively connectable, or
operatively connected, to the suction unit device for fluid
communication therewith; and a holder which is connected to the
chassis and which holds the suction bar; wherein the holder has
associated therewith a pivot joint via which the suction bar is
pivotable relative to the chassis; and wherein a locking device is
provided via which an adjusted pivot position of the suction bar
relative to the chassis is lockable in place.
41. Floor cleaning machine in accordance with claim 40, wherein at
least one of the following is provided: a pivot axis of the pivot
joint is oriented at least approximately parallel to a plane of
support of the suction bar on a floor to be cleaned; the pivot axis
is oriented at least approximately parallel to a wheel axis; the
pivot axis is oriented transversely to a direction of forward
travel.
42. Floor cleaning machine in accordance with claim 40, wherein the
holder is formed of multi-part configuration and the pivot joint is
integrated in the holder.
43. Floor cleaning machine in accordance with claim 40, wherein the
holder comprises a first part and a second part, wherein the second
part comprises a contact region for the suction bar, the second
part is connected to the first part via the pivot joint, and the
second part is lockably pivotable relative to the first part.
44. Floor cleaning machine in accordance with claim 43, wherein the
locking device is connected to the first part and the second
part.
45. Floor cleaning machine in accordance with claim 43, wherein the
holder comprises a fastening part which is fixed at the chassis,
and comprises an intermediate part which comprises the first part,
wherein the intermediate part is oriented at an angle to the
fastening part, the intermediate part is in spaced relation to the
chassis, and an engagement region at the locking device for an
operator is above an upper side or above an underside of the
intermediate part.
46. Floor cleaning machine in accordance with claim 43, wherein the
locking device comprises at least one pin element which is in
spaced relation to a pivot axis of the pivot joint and is connected
to the first part and the second part, wherein a height position of
the at least one pin element locks a pivot position of the second
part relative to the first part, with at least one of the
following: the at least one pin element is formed as an adjusting
screw; the at least one pin element is at least one of (i) guided
by at least one of the first part and the second part via threads
and (ii) provided with a counter nut; a compression spring device
is located between the first part and the second part in the region
of the at least one pin element and is supported on the first part
and the second part.
47. Method for operating a floor cleaning machine; comprising: a
suction unit device; a suction bar which is operatively
connectable, or operatively connected, to the suction unit device
for fluid communication therewith; a holder which releasably holds
the suction bar; a fixing device for releasably fixing the suction
bar at the holder; and an overload protection device which is
associated with the suction bar; wherein the overload protection
device comprises at least one rotational bearing by way of which
the suction bar is rotatable at the holder relative to the holder
when an overload situation occurs; the method comprising: rotating
the suction bar which is held to a holder relative to the holder
via the at least one rotational bearing when an overload event
occurs.
Description
[0001] This application is a continuation application of
international application number PCT/EP2019/080603 filed on Nov. 7,
2019, the entire contents of which are incorporated herein by
reference in its entirety.
[0002] The present disclosure relates to the subject matter
disclosed in international application number PCT/EP2019/080603
filed on Nov. 7, 2019, which is incorporated herein by reference in
its entirety and for all purposes.
BACKGROUND OF THE INVENTION
[0003] The invention relates to a floor cleaning machine,
comprising a suction unit device, a suction bar which is
operatively connectable, or operatively connected, to the suction
unit device for fluid communication therewith, a holder which
releasably holds the suction bar, a fixing device for releasably
fixing the suction bar at the holder, and an overload protection
device which is associated with the suction bar.
[0004] The invention further relates to a method for operating a
floor cleaning machine.
[0005] WO 2011/057232 A2 discloses a release mechanism for a
suction bar in a floor cleaning machine.
[0006] Suction bars are disclosed, for example, in EP 2 559 367 A1,
WO 2014/191024 A1, WO 2015/086115 A1, JP 05280785 B2, EP 3 178 363
A1. DE 20 2014 011 047 U1 discloses a suction nozzle.
[0007] DE 10 2011 055 445 A1 discloses a cleaning apparatus
comprising a suction channel.
[0008] EP 2 814 370 B1 discloses a floor cleaning machine
comprising a release squeegee.
[0009] DE 10 2009 029 956 A1 discloses a self-propelled pick-up
sweeper.
[0010] DE 196 11 371 A1 discloses a suction apparatus attachment
for wet cleaning of surfaces.
SUMMARY OF THE INVENTION
[0011] In accordance with an exemplary embodiment of the invention,
a floor cleaning machine is provided which permits an optimized
cleaning operation to be effected.
[0012] In accordance with an exemplary embodiment of the invention,
the floor cleaning machine comprises a suction unit device, a
suction bar which is operatively connectable, or operatively
connected, to the suction unit device for fluid communication
therewith, a holder which releasably holds the suction bar, a
fixing device for releasably fixing the suction bar at the holder,
and an overload protection device which is associated with the
suction bar, wherein the overload protection device comprises at
least one rotational bearing by way of which the suction bar is
rotatable at the holder relative to the holder when an overload
situation occurs.
[0013] In the event that the suction bar, when operating in a
cleaning mode, collides against an object or even snags onto an
object, an overload situation can occur. In the solution in
accordance with the invention, in certain overload situations, the
suction bar, via the at least one rotational bearing, can perform
an avoidance movement by rotating at the holder before it in
particular falls away therefrom. Damage to the floor cleaning
machine and to the object is thereby avoided.
[0014] In particular, the at least one rotational bearing has no
function during normal cleaning operation. It only functions in a
(certain) overload situation to enable the suction bar to perform
an avoidance movement relative to the holder.
[0015] The at least one rotational bearing does not necessarily
have a function in every type of overload situation. For example,
the situation may arise where the cleaning machine is passing
through a passageway that has room for the body of the machine to
pass therethrough but leaves no room for the suction bar. When the
suction bar collides against the boundaries of the passageway on
either side of it, then the configuration of the overload
protection device (overload protection) is such that the suction
bar (when in such position that both sides thereof simultaneously
collide against the boundaries) will fall off without prior
rotation.
[0016] It is advantageous for the at least one rotational bearing
to have an axis of rotation with at least one of the following:
[0017] the axis of rotation is transverse, and in particular
perpendicular, to a plane of support of the suction bar on a floor
to be cleaned; [0018] the axis of rotation is transverse, and in
particular perpendicular, to a wheel axis of the floor cleaning
machine; [0019] the axis of rotation is in spaced relation to a
central plane of the suction bar, which central plane lies between
a first end face and a second end face of the suction bar, relative
to a fixing position of the suction bar at the holder; [0020] the
axis of rotation is oriented at least approximately parallel to a
central plane which lies between a first end face and a second end
face of the suction bar, relative to a fixing position of the
suction bar at the holder.
[0021] The fixing position is a position of the suction bar with
respect to the floor cleaning machine which permits a proper
cleaning operation and a cleaning run to be performed. Here, the
suction bar sits (with its suction lips) on the surface being
cleaned and can draw off excess fluid (which is dirt-laden in
particular). By virtue of the corresponding orientation of the axis
of rotation of the at least one rotational bearing, in the event
that the suction bar collides against an object or in the event
that the suction bar snags onto an object, an avoidance movement
can be achieved in order to avoid damage to the floor cleaning
machine and to the object.
[0022] In particular, the at least one rotational bearing, relative
to a fixing position of the suction bar at the holder, is in spaced
relation to a port for a suction conduit that is arranged at the
suction bar, and/or is in spaced relation to a central plane of the
suction bar which lies between a first end face and a second end
face of the suction bar. A capability for rotation of the suction
bar relative to the holder can thereby be achieved when an overload
situation is encountered.
[0023] It is particularly advantageous for at least a first
rotational bearing and a second rotational bearing to be provided,
which second rotational bearing is in spaced relation to the first
rotational bearing. With this arrangement, in the event of a
collision to the left hand side or to the right hand side, a
respective avoidance movement can be achieved. In particular, at
least one of the following is then provided:
[0024] a first axis of rotation of the first rotational bearing and
a second axis of rotation of the second rotational bearing are at
least approximately parallel to one another; [0025] a central plane
of the suction bar which lies between a first end face and a second
end face of the suction bar, lies between the first rotational
bearing and the second rotational bearing, relative to a fixing
position of the suction bar at the holder; [0026] the first
rotational bearing and the second rotational bearing are in a
mirror-symmetrical arrangement about a central plane which lies
between a first end face end and a second end face end of the
suction bar; [0027] a port for a suction conduit at the suction bar
is located between the first rotational bearing and the second
rotational bearing, relative to a fixing position of the suction
bar at the holder.
[0028] Thus, in particular, a symmetrical arrangement can be
achieved which permits different avoidance movements for different
overload situations to be performed by the suction bar.
[0029] In a configuration with simple construction, the suction bar
comprises a support region for the holder and the holder comprises
a contact region for the support region of the suction bar, in
particular wherein in a fixing position of the suction bar at the
holder, the suction bar is clampingly held to the holder via the
contact region. This then provides a simple way of mounting or
dismounting the suction bar with respect to the holder. A simple
way is provided to fix the suction bar at the holder in a
force-locking manner and/or in a form-locking manner. An overload
protection device can be configured in a simple manner. The at
least one rotational bearing can be implemented in a simple manner.
In particular, a rotation of the suction bar relative to the holder
can be implemented in an overload situation in which the contact
region is in supportive contact with the support region and, hence,
the suction bar still remains with the holder.
[0030] It is then particularly advantageous for the support region
to have a planar contact surface and, in particular, for the
contact region to have a planar contact surface for the support
region. This provides a simple way of implementing the at least one
rotational bearing.
[0031] In an embodiment having simple construction, the at least
one rotational bearing comprises a wall which is arranged at the
support region of the suction bar, wherein the wall defines a
receptacle, and the at least one rotational bearing comprises a
counter element which is arranged at the contact region of the
holder, wherein, in a fixing position of the suction bar at the
holder, the counter element is positioned in the receptacle. This
provides a simple way of implementing the at least one rotational
bearing when the fixing position of the suction bar at the holder
is present. The at least one rotational bearing does not hinder
mounting the suction bar to the holder and does not hinder
dismounting the suction bar from the holder. The at least one
rotational bearing can be formed with a minimized number of
components.
[0032] In particular, at least one of the following is provided:
[0033] the receptacle is closed towards the support region of the
suction bar, and is in particular bounded by the support region;
[0034] the receptacle is open in a direction away from the support
region; [0035] the receptacle is bounded by the wall in a direction
away from the holder, with respect to a fixing position of the
suction bar at the holder; [0036] the receptacle is open towards
the holder with respect to a fixing position of the suction bar at
the holder; [0037] the wall has an arcuate shape; [0038] the wall
extends in an angular range of at most 180.degree.; [0039] the wall
has a height of no more than 5 cm, and in particular of no more
than 3 cm, and in particular of no more than 2 cm.
[0040] Once the corresponding counter element is received in the
receptacle, a rotational bearing is implemented. The arcuate
configuration correspondingly provides a capability for rotation.
By virtue of the wall's limited dimensions and/or by virtue of the
upwardly and rearwardly open receptacle, the counter element also
can be brought out of the receptacle when a certain overload
situation is encountered. It is then possible, for example, for the
suction bar to be fully released from the holder. This effectively
prevents damage to collision objects or to the floor cleaning
machine and the suction bar.
[0041] Furthermore, it is advantageous for at least one of the
following to be provided: [0042] the counter element has an arcuate
shape on an end face that faces towards the wall; [0043] the
counter element is formed as a finger; [0044] the counter element
is of planar configuration on an underside thereof facing towards
the support region of the suction bar; [0045] the counter element
is of planar configuration on an upper side thereof facing away
from the underside; [0046] a height of the counter element between
an upper side and an underside is no more than 2 cm.
[0047] Thus, the at least one rotational bearing can be implemented
with simple structure. The number of components required is
minimized.
[0048] In an embodiment, the counter element bounds an indentation
at the holder, with at least one of the following: [0049] a
fastening element of the suction bar is positioned in the
indentation when the suction bar is in a fixing position at the
holder; [0050] the indentation has an arcuate boundary; [0051] the
indentation is bounded by a web on a side thereof facing away from
the counter element.
[0052] In this way, optimized positioning of the suction bar at the
holder can be achieved.
[0053] In an advantageous embodiment, at least one tab is arranged
at the suction bar for connection to the holder. An additional
fixing region can thereby be provided. For example, this provides a
simple way of preventing tilting of the suction bar relative to the
holder (rotation of the suction bar relative to the holder).
Furthermore, the tab can be utilized for positioning the suction
bar at the holder, wherein, when the tab is correctly positioned,
the at least one rotational bearing is automatically also
established. Simple mounting and dismounting of the suction bar can
thereby be achieved.
[0054] In accordance with a particularly advantageous exemplary
embodiment of the invention, at least one tab is arranged at the
suction bar for connection to the holder, and the at least one tab
is formed as a hand grip for holding the suction bar.
[0055] The tab can then be used on the one hand for connection to
the holder, and on the other hand, when the suction bar has been
released from the holder, the at least one tab allows the suction
bar to be held and carried by an operator.
[0056] In particular, the at least one tab is formed as a hoop. In
this form, a weight saving is achieved. A simple way is provided
for an operator to utilize the tab as a hand grip.
[0057] It is advantageous for the at least one tab to be centrally
arranged with respect to outer end faces of the suction bar. With
the tab configured as a hand grip, one can, in a sense, hold and
carry the suction bar in a "balanced" orientation. Furthermore,
this is a simple way of centrally providing tilt protection.
[0058] It is advantageous for the holder to comprise a holder
receptacle for the at least one tab, wherein the at least one
holder receptacle is configured for providing support to the tab.
In particular, support against rotation of the suction bar relative
to the holder can thereby be achieved.
[0059] In particular, at least one of the following is provided:
[0060] the holder receptacle is configured for providing support to
the at least one tab downwardly towards a floor to be cleaned;
[0061] the holder receptacle is configured for providing support to
the at least one tab upwardly in a direction away from a floor to
be cleaned; [0062] the holder receptacle is open on an insertion
side; [0063] the holder receptacle has associated therewith an
insertion ramp on an insertion side.
[0064] By the provision of the downward and/or upward support, with
respect to the holding of the suction bar by the holder, one or
more points of support can be provided. This provides a simple way
of achieving tilt protection in particular.
[0065] By the provision of the holder receptacle apertured on the
insertion side, the at least one tab can be inserted into the
holder receptacle. A simple mounting and dismounting are thereby
possible.
[0066] By employing the insertion ramp, the insertion is
facilitated. This provides an optimized useability for an
operator.
[0067] Here, it is advantageously provided for the holder to
comprise a contact region and for the suction bar to comprise a
support region for said contact region, wherein the contact region
is in spaced relation to the holder receptacle for the at least one
tab. By way of example, the contact region is spaced in height. As
a result of this, a further point of support is provided for the
suction bar at the holder, and this provides a simple way of
achieving tilt protection in particular.
[0068] It is advantageous for a housing box to be arranged at the
holder, to which housing box is connected a suction conduit, and
for the housing box, in a fixing position of the suction bar at the
holder, to be positioned over a port for a suction conduit at the
suction bar. The port for a suction conduit forms part of the
suction bar. The housing box forms part of the holder. It is
thereby possible for a suction conduit to remain with the machine.
There is then no need for the suction conduit to reach all the way
to the suction bar and be connected to the suction bar. In turn,
the effect can thereby be achieved in a simple manner that, when an
overload event occurs, the suction bar is partially or fully
released from the holder without having to carry along with it the
suction conduit (in the form of a suction hose in particular). The
operative connection and fluid communication between the suction
conduit and the suction bar is realized via the connection between
the housing box and the port for a suction conduit at the suction
bar. Furthermore, this results in a simple mounting of the suction
bar to the holder and a simple dismounting therefrom.
[0069] In particular, at least one of the following is provided:
[0070] the housing box comprises a support surface for the suction
bar; [0071] the port for a suction conduit at the suction bar has
an inclined surface at which a port mouth is positioned; [0072] the
housing box is in spaced relation to at least one engagement region
of the fixing device; [0073] a holder receptacle for at least one
tab of the suction bar for fixing the suction bar at the holder is
arranged in the region of the housing box; [0074] the holder
receptacle is spaced in height from the housing box; [0075] in a
fixing position of the suction bar at the holder, operative
connection and fluid communication between a suction conduit and a
port for a suction conduit at the suction bar is established, and
is established automatically in particular; [0076] the holder
receptacle conforms to the at least one tab such that, when the
suction bar is fixed at the holder with the at least one tab
received in the holder receptacle, the holder is automatically
positioned relative to the suction bar such that the at least one
rotational bearing is formed.
[0077] This makes for a simple mounting and dismounting of the
suction bar. A simple way is provided to establish and release an
operative connection and fluid communication between the machine
and the suction bar, there being no need, for example, to
additionally connect or disconnect a suction conduit from the
suction bar.
[0078] In particular, then, a simple way is provided to
automatically establish the connection when the suction bar is
brought into its fixing position at the holder, and a simple way to
automatically release the connection is provided.
[0079] If, in the event of an overload situation, the suction bar
releases from the holder, the suction conduit can still remain with
the machine.
[0080] It is advantageous for the fixing device to be configured
such that in a fixing position of the suction bar at the holder, a
force-locking connection exists between the holder and the suction
bar. In the event that, when an overload situation occurs, a
certain threshold value of the force loading is exceeded, which
threshold value is then predetermined by the force-locking
connection, a relative movement between the suction bar and the
holder can be achieved in order to avoid the overload event and
prevent damage to the floor cleaning machine and the object. The
suction bar may be released from the holder.
[0081] Here, it can be advantageous for the fixing device to be
configured such that, in a fixing position of the suction bar at
the holder, a form-locking connection exists between the holder and
the suction bar, and exists in addition to a force-locking
connection in particular.
[0082] In particular, in accordance with an exemplary embodiment of
the invention, the fixing device is configured such that, in a
fixing position of the suction bar at the holder, a form-locking
connection exists between the holder and the suction bar, and, in
addition thereto, a force-locking connection exists between the
holder and the suction bar.
[0083] This provides a simple way of mounting and dismounting the
suction bar to and from the holder. Furthermore, this is a simple
way for the suction bar to be able to release from the holder when
an overload event occurs. In particular, this is a simple way of
implementing a capability for rotation of the suction bar relative
to the holder when an overload situation occurs.
[0084] In an embodiment having simple construction, the fixing
device comprises at least one clamping element which is arranged at
the suction bar and via which the holder can be clamped against the
suction bar. This provides a simple way of mounting and dismounting
the suction bar to and from the holder. A simple way to achieve a
force-locking connection is provided.
[0085] It is then advantageous for the suction bar to comprise a
support region for the holder and for the holder to comprise a
contact region for the support region of the suction bar, and,
here, for the at least one clamping element to be configured such
that the contact region of the holder can be clamped between the
support region and the at least one clamping element. In
particular, this provides a simple way of achieving, through the
clamping element, a clamped (and therefore force-locking)
connection by transition from an open position to a closed
position, or of releasing such clamped connection by reversing the
process.
[0086] In particular, at least one of the following is provided:
[0087] the at least one clamping element is formed as a clamping
lever, and is formed as an eccentric lever in particular; [0088]
the at least one clamping element comprises a pivot element which
has a clamping surface and which is pivotably mounted on a bearing
element; [0089] a bearing element of the at least one clamping
element is mounted for displacement on the suction bar; [0090] a
direction of displacement of the bearing element is oriented
transversely and perpendicularly to a pivot axis of the pivot
element; [0091] the bearing element is supported on the suction bar
via a spring device, and is supported on an inner side of a support
region of the suction bar in particular; [0092] a spring force of
the spring device in a clamping position of the at least one
clamping element exerts a clamping force for connecting the holder
and the suction bar together in a form-locking manner; [0093] a
direction of displacement of the bearing element and/or a direction
of force of the spring device is oriented at least approximately
parallel to an axis of rotation of the at least one rotational
bearing.
[0094] A force-locking connection can thereby be achieved which
affords simple construction. A simple mounting and dismounting of
the suction bar is possible.
[0095] It is advantageous if at least a first clamping element and
a second clamping element are provided, the second clamping element
being in spaced relation to the first clamping element. Clamping at
spaced-apart fixing points can thereby be achieved. In particular,
at least one of the following is provided: [0096] the first
clamping element and the second clamping element are arranged
outside of a central plane of the suction bar which lies between a
first end face and a second end face of the suction bar; [0097] the
first clamping element and the second clamping element have mirror
symmetry about a central plane of the suction bar which lies
between a first end face and a second end face; [0098] a port for a
suction conduit is positioned between the first clamping element
and the second clamping element; [0099] the first clamping element
and the second clamping element are located between a first
rotational bearing and a second rotational bearing.
[0100] In particular, a symmetrical arrangement can thereby be
achieved which provides optimized fixing of the suction bar at the
holder for a cleaning run, wherein a simple way is provided for an
operator to mount and dismount the suction bar. Furthermore, a
simple way is provided to achieve a force avoiding movement and
release of the suction bar from the holder when an overload
situation occurs.
[0101] It is advantageous for a form-locking connection to be
present in addition to a force-locking connection. In particular,
the fixing device then comprises at least one first form-locking
element which is arranged at the suction bar, and at least one
second form-locking element which corresponds to the first
form-locking element and is arranged at the holder. In this way,
for example, capabilities of movement for rotation of the suction
bar at the holder can be predetermined. This results in an improved
fixing.
[0102] In an embodiment, the at least one first form-locking
element and the at least second form-locking element are arranged
and configured such that, in a fixing position of the suction bar
at the holder, when a force-locking connection is established
between the suction bar and the holder, a form-locking connection
with the at least one first form-locking element and the at least
one second form-locking element is also established. In particular,
establishing a force-locking connection automatically establishes a
form-locking connection. An optimized fixing of the suction bar at
the holder for a cleaning run is thereby achieved.
[0103] In an embodiment having simple construction, the at least
one first form-locking element is arranged at the support region of
the suction bar for the holder. In particular, this provides a
simple way of establishing the fixing position of the suction bar
at the holder while at the same time achieving a force lock and a
form lock.
[0104] It is particularly advantageous for the at least one first
form-locking element and the at least one second form-locking
element to be configured to conform to one another such that, in a
fixing position of the suction bar at the holder, a movement of the
suction bar away from the holder in a blocking direction is blocked
by a form lock, and is blocked in a single blocking direction in
particular, with at least one of the following: [0105] the blocking
direction is at least approximately parallel to a plane of support
of the suction bar on a floor to be cleaned; [0106] the blocking
direction is at least approximately parallel to a direction of
insertion of at least one tab of the suction bar into a holder
receptacle of the holder; [0107] the blocking direction is
transverse, and in particular perpendicular, to an axis of rotation
of the at least one rotational bearing; [0108] the blocking
direction is at least approximately parallel to a chassis axis of
the cleaning machine; [0109] the blocking direction is at least
approximately parallel to a support region of the suction bar for
the holder; [0110] the blocking direction is transverse, and in
particular perpendicular, to a wheel axis; [0111] the blocking
direction is a unidirectional direction away from the holder.
[0112] On the one hand, this provides a simple way of releasing the
form-locking connection in a certain overload situation in order to
permit a relative movement of the suction bar with respect to the
holder also in the blocking direction. On the other hand, this
provides a simple way of securing the fixing position in the
blocking direction.
[0113] In particular, when a sufficiently large force is applied to
the suction bar (in the event of a threshold force on the suction
bar being encountered), the at least one second form-locking
element can be released from the at least one first form-locking
element. As a result, the form-locking connection provides a fixing
which, although secure, is still releasable when an overload
situation occurs.
[0114] In an embodiment having simple construction, the at least
one first form-locking element is formed by an elevation at the
suction bar and the at least one second form-locking element is a
nose at the holder.
[0115] It is then advantageous for the at least one second
form-locking element to have a blocking region for the at least one
first form-locking element with which blocking region the second
form-locking element is in contact against the first form-locking
element when in a form-locking connection, and for the at least one
second form-locking element to have an inclined plane for
overriding the at least one first form-locking element. It is
thereby possible, when a particular overload situation is
encountered, for the second form-locking element to be brought over
the first form-locking element in order to release the form locking
relation therebetween. The suction bar can then partially or fully
release from the holder in order to be able to avoid an overload
event.
[0116] In particular, in an overload event, the suction bar rotates
relative to the holder (via the at least one rotational bearing)
and/or falls off the holder. What form of motion occurs depends on
the particular overload situation, and in particular depends on how
a suction bar collides against an object or snags onto the
object.
[0117] In an embodiment, a checking device is provided to check for
blockage at a suction path. It is thereby possible to recognize
whether a blockage is formed at a suction path. The checking device
may also recognize whether the suction bar has become released from
the holder.
[0118] In particular, the checking device comprises at least one
pressure sensor which is arranged at the suction path, and is
arranged outside of the suction bar in particular. Via the at least
one pressure sensor, a special situation can be detected by
comparison against a characteristic curve family. It is also
possible, for example, for a further pressure sensor to be provided
at a fan.
[0119] The corresponding situation can be detected via a
differential measurement. In the solution in accordance with the
invention, the suction bar can partially or fully release from the
holder when an overload situation occurs. If the pressure sensor is
arranged outside of the suction bar, it can remain with the
machine, and operative connection and signal communication with the
machine automatically exists, even if the suction bar has become
released.
[0120] In particular, the pressure sensor is arranged at a pressure
conduit which can be connected, or is connected, to the suction
bar, and is in particular releasably connected thereto. The
pressure prevailing at the suction bar, and at the suction space of
the suction bar in particular, can be detected via the pressure
conduit. This can then be evaluated. Here, the pressure sensor need
not be arranged at the suction bar but can be positioned outside of
the suction bar.
[0121] It is advantageous for a port for a suction conduit at the
suction bar to comprise a port for the pressure conduit. The
pressure situation of a suction bar can thereby be measured, in a
sense, at a distance from the suction bar.
[0122] In an embodiment, the pressure conduit is connected to a
suction conduit.
[0123] This makes for a configuration having simple structure.
[0124] Furthermore, in accordance with an exemplary embodiment of
the invention, a floor cleaning machine is provided, the floor
cleaning machine comprising a chassis, a suction unit device, a
suction bar which is operatively connectable, or operatively
connected, to the suction unit device for fluid communication
therewith, and a holder which is connected to the chassis and which
holds the suction bar.
[0125] In accordance with an exemplary embodiment of the invention,
a floor cleaning machine is provided which has advantageous
cleaning properties.
[0126] In accordance with an exemplary embodiment of the invention,
the floor cleaning machine comprises a chassis, a suction unit
device, a suction bar which is operatively connectable, or
operatively connected, to the suction unit device for fluid
communication therewith, and a holder which is connected to the
chassis and which holds the suction bar, wherein the holder has
associated therewith a pivot joint via which the suction bar can be
pivoted relative to the chassis, and a locking device is provided
via which an adjusted pivot position of the suction bar relative to
the chassis can be locked in place.
[0127] For an optimized cleaning result to be achieved, the suction
bar (with its suction lips) must be oriented at an appropriate
angle with respect to the surface being cleaned. Because of
manufacturing tolerances, forces created during a cleaning
operation, and differing requirements depending on floor type it
may be advantageous to have variable presetting capabilities. By
way of example, the suction bar, when in operation, can suck down
on a floor surface and tilt somewhat in the direction of
travel.
[0128] By virtue of the solution in accordance with the invention,
an adjustable, lockable pivot position of the suction bar can be
preset. The suction bar can then be adjusted, for example during
mounting and/or during servicing and/or directly by an operator, in
such a way that the optimized cleaning result is achieved.
[0129] By virtue of the solution in accordance with the invention,
the floor cleaning machine is given enhanced variability in order
to achieve an optimized suction result and also to permit
adaptation to specific situations.
[0130] In particular, at least one of the following is provided:
[0131] a pivot axis of the pivot joint is oriented at least
approximately parallel to a plane of support of the suction bar on
a floor to be cleaned;
[0132] the pivot axis is oriented at least approximately parallel
to a wheel axis; [0133] the pivot axis is oriented transversely,
and in particular perpendicularly, to a direction of forward
travel.
[0134] In the corresponding orientation of the pivot axis, an
angular adjustment of the suction bar relative to the floor to be
cleaned can be effected in order to achieve an optimized cleaning
result. This provides a way of, for example, compensating for
manufacturing tolerances. Forces generated during operation can be
compensated for, or also adjustments can be made to suit a
particular floor type.
[0135] It is in principle possible for the holder as a whole to be
pivotably arranged at the chassis of the floor cleaning machine.
The pivot joint is then a pivot joint between the chassis and the
holder. Furthermore, it is also possible for the pivot joint to be
formed between the suction bar and the holder.
[0136] The holder in an advantageous embodiment is formed of
multi-part configuration and the pivot joint is integrated in the
holder. It is thereby possible, on the one hand, for the holder to
be fixedly connected to the chassis (wherein the holder may have
capability for height adjustment relative to the chassis), and it
is further possible for the suction bar to be connected to the
holder, in particular via a support region thereof. In particular,
this is a simple way of fixing the suction bar at the holder via a
corresponding fixing device, and is a simple way of providing an
overload protection device for the suction bar at the holder, as
described above. The pivotability for angular adjustment for an
optimized cleaning result is then fully integrated in the
holder.
[0137] In an advantageous embodiment, the holder comprises a first
part and a second part, wherein the second part comprises a contact
region for the suction bar, the second part is connected to the
first part via the pivot joint, and the second part is lockably
pivotable relative to the first part. This provides a simple way of
adjusting an angular position (pivotal position) of the suction bar
relative to the chassis and relative to the floor to be cleaned. As
a result, the corresponding pivot mechanism is simple in
construction.
[0138] It is then further advantageous for the locking device to be
connected (in particular directly connected) to the first part and
the second part. This provides a simple way of adjusting and also
locking a pivot position.
[0139] In an advantageous embodiment, the holder comprises a
fastening part which is fixed at the chassis, and comprises an
intermediate part which comprises the first part, wherein the
intermediate part is oriented at an angle to the fastening part,
the intermediate part is in spaced relation to the chassis, and an
engagement region at the locking device for an operator is above an
upper side or above an underside of the intermediate part. The term
"above" as used herein means that a spaced relation exists to the
upper side or to the underside and that the upper side or the
underside bounds the corresponding space. This provides a simple
way of making the locking device accessible to an operator in order
to adjust and lock a particular pivot position of the suction bar.
A space is present above the upper side or above the underside via
which access can be had to the locking device, in particular with a
tool.
[0140] In an embodiment having simple structure, the locking device
comprises at least one pin element which is in spaced relation to a
pivot axis of the pivot joint and is connected to the first part
and the second part, wherein a height position of the at least one
pin element (at the first part and/or the second part) locks a
pivot position of the second part relative to the first part (and
hence also an angular position of the suction bar relative to the
chassis), in particular with at least one of the following: [0141]
the at least one pin element is formed as an adjusting screw;
[0142] the at least one pin element is guided by the first part
and/or the second part via threads and/or is provided with a
counter nut; [0143] a compression spring device is located between
the first part and the second part in the region of the at least
one pin element and is supported on the first part and the second
part.
[0144] This provides a simple way of adjusting and locking in place
a defined pivot position of the second part with respect to the
first part. Here, in particular, the at least one pin element is
arranged in spaced relation to the suction bar and is positioned,
for example, between a fastening part and a holding part of the
holder. This provides for improved operator accessibility in order,
for example, to be able to act on the at least one pin element via
a corresponding tool.
[0145] In accordance with an exemplary embodiment of the invention,
a method for operating a floor cleaning machine in accordance with
the invention is provided, in which method the suction bar which is
held to a holder can be rotated relative to the holder via the at
least one rotational bearing when an overload event occurs.
[0146] The method in accordance with the invention has the
advantages that have already been discussed in connection with the
apparatus in accordance with the invention.
[0147] The following description of preferred embodiments serves in
conjunction with the drawings to explain the invention in greater
detail.
BRIEF DESCRIPTION OF THE DRAWINGS
[0148] FIG. 1 shows, in top view, an exemplary embodiment of a
floor cleaning machine in accordance with the invention;
[0149] FIG. 2 shows the floor cleaning machine of FIG. 1 in bottom
view,
[0150] FIG. 3 illustrates, in perspective view, a suction bar of
the floor cleaning machine of FIGS. 1, 2, showing it in its fixing
position on a holder of the floor cleaning machine;
[0151] FIG. 4 shows a view similar to FIG. 3, although in the
nature of an exploded view (the position of clamping elements at
the suction bar corresponds to a position thereof when in a fixing
position);
[0152] FIG. 5 illustrates the suction bar of FIG. 3, with clamping
elements in such a position that the suction bar can be fixed on a
holder;
[0153] FIG. 6 illustrates a top view of the suction bar of FIG. 3
and the holder, with suction conduit removed;
[0154] FIG. 7 shows an enlarged view of detail A of FIG. 6;
[0155] FIG. 8 shows a sectional view taken along line 8-8 of FIG. 5
(with clamping elements shown as being "opened");
[0156] FIG. 9 shows a sectional view taken along line 9-9 of FIG.
7;
[0157] FIG. 10 shows a sectional view taken along line 10-10 of
FIG. 7;
[0158] FIG. 11 shows a sectional view taken along line 11-11 of
FIG. 7, wherein FIGS. 7 to 11 illustrate a fixing position of the
suction bar at the holder;
[0159] FIG. 12 illustrates a view similar to FIG. 10, but showing
an intermediate condition where the suction bar is about to release
from the holder;
[0160] FIG. 13 shows an enlarged view of a portion of a holder
receptacle of a holder for receiving a tab of the suction bar;
[0161] FIG. 14 shows a partial view of an exemplary embodiment of a
suction conduit, shown as having a pressure conduit connected
thereto;
[0162] FIG. 15 illustrates, in a perspective view, another
exemplary embodiment of a holder, shown as having a suction bar
held thereto;
[0163] FIG. 16 shows a sectional view taken along section plane B
of FIG. 15; and
[0164] FIG. 17 shows a sectional view taken along section plane C
of FIG. 15.
DETAILED DESCRIPTION OF THE INVENTION
[0165] An exemplary embodiment of a cleaning machine in accordance
with the invention, shown in FIGS. 1 and 2 and in the partial views
of FIGS. 3 to 14, designated therein by 10, is a scrubber suction
machine. The cleaning machine 10 comprises a chassis 12. Arranged
at the chassis 12 is a rear wheel device 14 having a left rear
wheel 18 and a right rear wheel 20, relative to a direction of
forward travel 16.
[0166] Also located at the chassis 12 is a steerable front wheel 22
which can be steered via a steering wheel 24 (FIG. 1).
[0167] In the exemplary embodiment as shown, the cleaning machine
10 is configured as a ride-along machine. A driver's seat 26 is
arranged on the chassis 12. A driver sitting on the driver's seat
26 can access the steering wheel 24.
[0168] The cleaning machine 10 is formed of self-propelled
configuration. To this end, the cleaning machine 10 comprises a
motor drive such as an internal combustion engine or an electric
motor.
[0169] Furthermore, (at least) one cleaning tool 28 is arranged at
the chassis 12 (FIG. 2). For the case of a scrubber suction
machine, the at least one cleaning tool 28 is a scrubbing tool. In
particular, the scrubbing tool is provided with corresponding
bristles.
[0170] In operation of the cleaning machine 10, the cleaning tool
28 performs a rotary movement about an axis of rotation 30. The
axis of rotation 30 of the cleaning tool 28 is oriented in
particular transversely to a wheel axis 32 of the rear wheel device
14. Here, the axis of rotation 30 can be oriented perpendicular to
the wheel axis 32, or it can be inclined at a small angle, for
example in the order of magnitude of 5.degree. to 10.degree., from
the perpendicular to the wheel axis 32.
[0171] The cleaning machine 10 comprises a motor drive for rotating
the cleaning tool 28 about the wheel axis 32.
[0172] The cleaning machine 10 comprises an application device 34
for applying cleaning liquid onto a floor 36 that is to be cleaned
(cf. FIG. 8). To this end, a nozzle device is arranged at the
cleaning machine 10 via which cleaning liquid can be applied
directly to the floor 36 to be cleaned. Alternatively or in
addition, provision may be made for the cleaning liquid to be
applied to the cleaning tool 28.
[0173] In particular, the cleaning liquid is water which may have
added thereto a cleaning agent, for example a surfactant cleaning
agent.
[0174] In particular, a tank device for cleaning liquid is arranged
at the chassis 12.
[0175] In operation of the cleaning machine 10, provision is made
for excess liquid to be sucked up from the floor 36. To this end, a
suction bar 40 (suction squeegee) is held to the chassis 12 via a
holder 38 (FIG. 2).
[0176] The cleaning machine 10 comprises a suction unit device 42
(cf. FIG. 1) having a fan and a fan motor. The fan has (at least)
one impeller which is driven in rotation by the fan motor. A
suction flow is thereby generated. The suction flow is applied to
the suction bar 40 for taking up liquid from the floor 36 by
suction.
[0177] The suction unit device 42 has associated therewith (at
least) one dirty fluid tank 44 which receives fluid that has been
sucked up. A separator may be provided.
[0178] The holder 38 is fixedly connected to the chassis 12. In
particular, the holder 38 is arranged centrally relative to a width
direction 46 of the chassis 12 (which is a direction parallel to
the wheel axis 32).
[0179] In an embodiment, the holder 38 is arranged and/or
configured such that a height position of the suction bar 40
relative to the floor 36 to be cleaned is adjustable. In
particular, then, an operating position is provided in which the
suction bar 40 sits on the floor 36 being cleaned, and a
spaced-apart position of the suction bar 40 relative to the floor
36 is provided. In the spaced-apart position of the suction bar 40,
the cleaning machine 10 can travel over a ground surface without
the suction bar 40 touching the ground surface and undergoing
unnecessary wear.
[0180] The suction bar 40 is arranged at the chassis 12 at a
location downstream of the at least one cleaning tool 28 (relative
to the direction of forward travel 16 in particular). In operation
of the cleaning machine 10, cleaning liquid is applied to the floor
36 to be cleaned in the region of the cleaning tool 28. The
downstream suction bar 40 is used for later pickup of excess
liquid, subsequent to a cleaning operation performed on a
particular area of the floor surface traversed by the cleaning
machine 10.
[0181] In the cleaning machine 10, the suction bar 40 is arranged
in the region of a rear end 48. Here, the rear end 48 faces away
from a front end 50, wherein the front wheel 22 is positioned in
the region of the front end 50. The suction bar 40 is also arranged
downstream of the rear wheel device 14.
[0182] It is alternatively possible for the suction bar 40 to be
arranged upstream of the rear wheel device 14, relative to the
direction of forward travel 16 (and thereby to be arranged
downstream of the at least one cleaning tool 28).
[0183] The holder 38 (cf. FIGS. 3 and 4 for example) comprises a
fastening part 52 by which it is fixed at the chassis. Here, as
mentioned above, the fixation can be fixed or with capability for
height adjustment.
[0184] The fastening part 52 is located at an intermediate part 54.
In particular, the fastening part 52 is oriented at an angle to the
intermediate part 54, which angle is, for example, of the order of
150.degree..
[0185] Located at the intermediate part 54 is a holding part 56
which serves to releasably fix the suction bar 40.
[0186] The fastening part 52 is fixedly connected to the chassis 12
or is located at a height adjustment device which is connected to
the chassis 12 and, in particular, via which the suction bar 40 can
be lowered onto the floor 36 that is to be cleaned.
[0187] The holding part 56 is oriented transversely to the
intermediate part 54. A width of the intermediate part 54 in a
width direction is smaller than a corresponding width of the
holding part 56 in that direction. The combination of intermediate
part 54 and holding part 56 is T-shaped.
[0188] The holding part 56 comprises a contact region 58 for the
suction bar 40. The suction bar 40 comprises a corresponding
support region 60. The contact region 58 can be placed upon the
support region 60. In particular, in a fixing position 62 of the
suction bar 40 at the holder 38, in which position the suction bar
40 is fixed at the holder 38 for suction mode of operation, the
suction bar 40 is clamped against the holder 38 via the contact
region 58. This will be further elaborated below.
[0189] By way of example, the contact region 58 has a planar
contact surface 64 for the support region 60 of the suction bar 40
(cf., for example, FIG. 9).
[0190] In an exemplary embodiment, the holding part 56 is formed
with a flat configuration. Here, a surface of the holding part 56
opposite the contact surface 64 is, at least in portions thereof,
of a planar configuration.
[0191] At a middle portion of the holding part 56 is connected a
housing box 66. The housing box 66 is open towards the contact
surface 64 and is open towards a front side 68. It has opposed side
walls 70 which are formed of triangular shape. It has the open side
thereof that faces towards the contact surface 64 closed by a lid
72. The lid 72 is oriented at an acute angle 74 to the contact
surface 64 (cf. FIG. 11). The acute angle 64 is, for example, of
the order of 25.degree..
[0192] A height of an interior space 76 of the housing box 66
increases continuously towards the front side 68.
[0193] A connecting piece 78 is arranged at the lid 72 of the
housing box 66. Connected to the connecting piece 78 is a suction
conduit 80 which is operatively connected to the suction unit
device 42 for fluid communication therewith. The suction conduit
has been omitted for clarity in FIGS. 6, 7, 11.
[0194] The suction conduit 80 is a machine-side suction conduit 80.
It is not connected to the suction bar 40 directly but via the
housing box 66. The housing box 66, along with the connecting piece
78 and the suction conduit 80 connected thereto, forms a
machine-side connection of the suction unit device 42 to the
suction bar 40.
[0195] When the suction bar 40 is removed from the cleaning machine
10 upon release of its fixing position 62, or when it releases from
the cleaning machine 10 following an overload situation (as will be
described in more detail below), the suction conduit 80 remains
with the cleaning machine 10, and, here, remains with the housing
box 66 in particular, while a corresponding suction pathway is
disconnected from the suction bar 40, i.e., the operative
connection and fluid communication therebetween ceases to
exist.
[0196] The suction bar 40 comprises a port 82 for the suction
conduit 80 which functions as a counter part to the housing box 66.
This will be explained in more detail below.
[0197] The holder 38 comprises, at the holding part 56 thereof, in
spaced relation to the contact region 58, a holder receptacle 84
(FIGS. 11, 13). The holder receptacle 84 serves to receive (at
least) one tab 86 of the suction bar 40. The holder receptacle 84
is open towards a front side 88 which in the fixing position 62
faces towards the suction bar 40. It is closed on all other sides.
The holder receptacle 84 comprises a wall 90 which has a rear wall
92a opposite the front side 88. It further comprises a bottom wall
92b which is oriented transversely to the rear wall 92a. It has a
cover wall 92c which is in spaced relation to the bottom wall 92b.
The cover wall 92c is in particular parallel to the bottom wall
92b.
[0198] The holder receptacle 84 is closed at its sides by opposed
side walls (not visible in the drawing).
[0199] The holder receptacle 84 has dimensions that conform to
those of the tab 86. The tab 86, when in the fixing position 62,
extends into a corresponding opening 94 of the holder receptacle 84
(cf. FIG. 13 in particular). Here, the opening 94 is formed between
the rear wall 92a, the bottom wall 92b, the cover wall 92c and the
corresponding side walls. In particular, the holder receptacle 84
is configured such that it forms a positioning aid for locating the
suction bar 40 at the holder 38. Accordingly, little play is
permitted to the tab 86 within the opening 94. Once the position of
the tab 86 is established in the opening 94, then the fixing
position 62 can also be correspondingly established.
[0200] At the front side 88, which is an insertion side, the holder
receptacle 84 has associated therewith an insertion ramp 96 (FIG.
13). The tab 86 of the suction bar 40 can be positioned in the
opening 94 in a direction of insertion 98. The insertion ramp 96
has at least one wall 100 which is oriented at an incline to the
direction of insertion 98 in order to facilitate insertion.
[0201] In the exemplary embodiment as depicted in FIG. 13, opposed
walls 100 are provided, each of which is oriented at an incline to
the direction of insertion 98.
[0202] By virtue of the insertion ramp 96, a form of insertion
funnel for the tab 86 is formed at the holder receptacle 84.
[0203] The holder receptacle 84, when seen in a longitudinal
direction 102 (cf. FIG. 10), which is a direction parallel to the
direction of insertion 98, is placed in spaced relation with
respect to the contact region 58 having the contact surface 64. A
further support region to support the suction bar 40 in spaced
relation to the contact surface 64 is thereby provided for the
suction bar 40 in the fixing position 62 at the holder 38.
[0204] It is in particular provided that, when seen in a height
direction 104 (cf. FIG. 10), the holder receptacle 84 is placed in
spaced relation with respect to the contact region 58, and the
contact surface 64 in particular (see FIGS. 10 and 13).
[0205] It is, in principle, also possible for the holder receptacle
84 to have, at the opening 94 thereof, a directly adjoining
relationship with the contact surface 64 and, for example, for the
contact region 58, at an inner side thereof where the contact
surface 64 lies, to form the cover wall 92c.
[0206] In particular, the further support provided to the suction
bar 40 via the tab 86 within the holder receptacle 84 prevents the
suction bar 40 from tilting at the holder 38 when in the fixing
position 62.
[0207] The holder 38, and the holding part 56 in particular, are
configured with at least approximate mirror symmetry about a
central plane 106 (FIG. 4).
[0208] The holding part 56 of the holder 38 has a finger 108 at an
outer end region of the contact region 58. The finger 108 laterally
bounds the holding part 56.
[0209] At an end face 110, the finger 108 is formed in an arcuate
shape, and, here, in a convexly arcuate shape. Adjoining the finger
108 in a direction towards the central housing box 66 is an
indentation 112. The indentation 112 is rounded, formed with an
arcuate configuration; it has a concave boundary.
[0210] The indentation 112 is bounded by a web 114, or transitions
into said web. The end face 110 of the finger 108 and a
corresponding end face of the web 114 are spaced from one another
via the indentation 112, wherein a continuous transition is present
via the concave boundary.
[0211] At a location lying next to the housing box 66, the contact
region 58 has a region 116. Located between the region 116 and the
web 114 is a further indentation 118. The further indentation 118
is, for example, cuboid-shaped with a rounded back side.
[0212] In particular, the further indentation 118 has a smaller
width in a width direction 120 of the holding part 56 than the
indentation 112.
[0213] Because the holding part 56 is configured to have mirror
symmetry, in particular at the contact region 58 of the central
plane 106, the aforementioned structure, including the elements of
further indentation, web, indentation, finger, is duplicated.
[0214] This geometrical configuration of the holding part 56
conforms to the suction bar 40 in order to be able to fix same in
the fixing position 62 and in order to be able to partially or
fully release the suction bar 40 from its fixing position 62 at the
holder 38 when an overload situation occurs.
[0215] The holding part 56 has formed at its contact region 58 and,
relative to the fixing position 62, on a side thereof that faces
towards the suction bar 40, at least one nose 122 (FIGS. 10, 12).
In particular, two noses 122 are provided in a mirror-symmetrical
arrangement about the central plane 106.
[0216] Furthermore, a nose 122 is arranged at the region 116 in
particular.
[0217] The corresponding nose 122 serves to establish a
form-locking connection, in particular in the fixing position 62 of
the suction bar 40 at the holder 38. The suction bar 40 comprises
corresponding counter elements, namely a first form-locking element
124 associated with a nose 122, wherein the associated nose 122
then forms a second form-locking element for a corresponding
form-locking connection. This will be explained in more detail
below.
[0218] As an example, a nose 122 is of wedge-shaped configuration.
The corresponding nose 122 has a blocking region 126a for the first
form-locking element 124 and an inclined plane 126b which adjoins
the blocking region 126a. In particular, the first form-locking
element 124 can be overridden via the inclined plane 126b. This is
explained in more detail below.
[0219] In a wedge-shaped configuration, the blocking region 126a is
formed at the "steep" slope, while the inclined plane 126b is
formed at the "flat" slope.
[0220] A height of the nose 122 above the contact surface 64 (cf.
FIG. 10, for example) increases along the inclined plane 126b in a
direction 128 towards the blocking region 126a. Here, the direction
128 is perpendicular to the width direction 120, and is also
parallel to the direction of insertion 98 in particular.
[0221] The suction bar 40 comprises a bar body 130. The bar body
130 extends between a first end face 132 and a second end face 134
along an axis of extent 136.
[0222] In an exemplary embodiment, the suction bar 40 has a curved
configuration and the axis of extent 136 is correspondingly
curved.
[0223] In particular, the suction bar 40 has an apex region 138
with respect to which, in the fixing position 62 and fitted to a
cleaning machine 10, the suction bar 40 is curved in a convex shape
when viewed in a direction from the front end 50 towards the rear
end 48 of the cleaning machine 10, that is, it is curved in the
direction towards the front end 50.
[0224] In an embodiment, provision is made for the suction bar 40
to have a length along the axis of extent 136 such that it projects
beyond the chassis 12 on the left hand side and on the right hand
side (cf. FIGS. 1 and 2).
[0225] It is in particular further provided for the suction bar 40
to not substantially project beyond the rear end 48 of the cleaning
machine 10.
[0226] In particular, the suction bar 40, with its bar body 130,
has at least approximate mirror symmetry about a central plane 140,
wherein the central plane 140 lies centrally between the first end
face 132 and the second end face 134.
[0227] Arranged at the bar body, in the region of the end faces
132, 134, is in each case a castor wheel element 142, or the castor
wheel element 142 forms the end faces 132, 134 in each case.
[0228] The castor wheel element 142 comprises (at least) one castor
wheel 144 which, in operation of the cleaning machine 10, can roll
over the floor 36 being cleaned. This provides additional support
for the suction bar 40.
[0229] Here, the corresponding castor wheels 144 of the castor
wheel elements 142 are arranged such that they are outside of a
cleaning liquid floor pattern. The castor wheels 144 point
outwardly in a direction from the front end 50 to the rear end
48.
[0230] Furthermore, the castor wheel elements 142 are in each case
provided at an end region thereof with a roller 146 which is for
rolling along a wall surface. The rollers 146 provide a form of
lateral stop bumpers.
[0231] In an embodiment, the castor wheel element 142 further
comprises a hand grip, and comprises a hoop-type grip 148 in
particular. The hoop-type grip 148 is positioned between castor
wheels 144 and 146.
[0232] Contact elements 150 for contact against the floor 36 to be
cleaned are arranged at the bar body 130 of the suction bar 40. In
suction mode of operation of the cleaning machine 10, the contact
elements 150 are supported on the floor 36 (FIG. 8). They define a
plane of support 152 for the floor 36.
[0233] In particular, a first contact element 150a (a first suction
lip) is provided, which first contact element 150a points outwardly
(viewed in a direction from the front end 50 to the rear end
48).
[0234] In spaced relation to the first contact element 150a is
provided a second contact element 150b (a second suction lip) which
points towards the front end 50 when viewed in a direction from the
rear end 48 to the front end 50 of the cleaning machine 10 (in the
fixing position 62 of the suction bar 40).
[0235] Here, the second contact element 150b faces towards the
cleaning tool 28.
[0236] The contact element 150b can be provided with recesses.
[0237] A suction space 154 is formed between the contact elements
150a and 150b. In suction mode of operation of the cleaning machine
10, the suction space 154 has applied thereto a suction flow which
is provided by the suction unit device 42. Excess liquid can
thereby be correspondingly taken up from the floor 36 by
suction.
[0238] In an embodiment, a ledge 156 is arranged at the bar body
130. The ledge 156 is removable from the bar body 130. Fastening
elements 158 are provided for connection. The fastening elements
158 are screws in particular.
[0239] In operation of the cleaning machine 10, the ledge 156 is
fixedly connected to the bar body 130 via the fastening elements
158.
[0240] By releasing the ledge 156 from the bar body 130, the
contact elements 150 can be replaced.
[0241] The port 82 for the suction conduit 80 is arranged on the
central plane 140 of the suction bar 40. The port 82 conforms to
the housing box 66. To this end, an elevation 160 is arranged at
the bar body 130. The elevation 160 has an inclined surface 162. A
port mouth 164 is positioned at the inclined surface 162. The port
mouth 164 is operatively connected to the suction space 154 for
fluid communication therewith.
[0242] In the fixing position 62, the housing box 66 is located
above the elevation 160, wherein an operative connection and fluid
communication is established between the suction conduit 80 and the
port mouth 164.
[0243] In particular, the elevation 160 can, in a sense, be slid
into the housing box 66 in the direction of insertion 98 (whereby
the tab 86 is also simultaneously slid into the holder receptacle
84).
[0244] Here, the port 82 and the housing box 66 are in particular
configured such that this process of inserting one within the other
in the fixing position 62 automatically establishes an operative
connection and fluid communication, and also fluid-tight
communication as well. To this end, a corresponding seal is
arranged in particular at the housing box 66 and/or at the port
mouth 164, which seal provides a fluid-tight connection, and, here,
provides automatic sealing in the fixing position 62 in
particular.
[0245] The housing box 66 has a support surface 173 via which it
can be supported on the support region 60 of the suction bar 40
when in the fixing position 62.
[0246] The tab 86 is arranged symmetrically with respect to the
central plane 140 on a side of the bar body 130 that faces away
from the first contact element 150a. It is thus centrally arranged
at the suction bar 40.
[0247] The tab 86 is formed as a hoop. It comprises a longitudinal
web 166 that is in spaced relation to the bar body 130. The tab 86
is connected to the bar body 130 via spaced transverse webs 168a,
168b, which are in spaced relation to one another. A free space 170
is provided between the longitudinal web 166 and the transverse
webs 168a, 168b.
[0248] The tab 86 is formed as a hand grip via which an operator
can carry the suction bar 40. As mentioned, the tab 86 is formed as
a hoop-type grip in particular.
[0249] In an exemplary embodiment, the support region 60 of the
suction bar, which serves to have the contact region 58 of the
holder 38 brought in contact thereagainst, is formed at the ledge
156. The support region 60 has a substantially planar contact
surface 172 for the contact surface 64 of the holding part 56.
[0250] In an embodiment, the tab 86 is offset in height relative to
the contact surface 172 in a direction towards the plane of support
152.
[0251] In an alternative embodiment, an upper side of the tab 86 is
on the same plane as the contact surface 172.
[0252] The tab 86 extends beyond the bar body 130.
[0253] A fixing device 174 is provided for fixing the suction bar
40 at the holder 38 and for securing the fixing position 62 in
place.
[0254] The fixing device 174 comprises a first clamping element 176
and a second clamping element 178 in spaced relation to the first
clamping element. In particular, the first clamping element 176 and
the second clamping element 178 are in a mirror symmetry
arrangement about the central plane 140. The port 82 is located
between the first clamping element 176 and the second clamping
element 178 at the suction bar 40.
[0255] The first clamping element 176 and the second clamping
element 178 are each formed as clamping levers, and are formed as
eccentric levers in particular.
[0256] The first clamping element 176 and the second clamping
element 178 each comprise a bearing element 180. The bearing
element 180 is supported for displacement in a direction of
displacement 182 on the suction bar 40, and is supported on the bar
body 130 in particular.
[0257] The bearing element 180 has a first region 184 which
projects upwardly beyond the support region 60 and, here, beyond
the ledge 156.
[0258] The bearing element 180 has a second region 186 which passes
through an opening 188 in the ledge 156.
[0259] The bearing element 180 further has a third region 190 which
is positioned above the suction space 154.
[0260] Arranged at the first region 184 is a pivot element 194
which is supported for pivotal movement by a pivot bearing 192. A
pivot axis 196 is oriented transversely and, in particular,
perpendicularly to the direction of displacement 182.
[0261] The pivot element 194 has a clamping surface 198 which is a
contact surface for the holding part 56 and, here, for the contact
region 58 thereof that faces away from the contact surface 64. By
way of the clamping surface 198, the holding part 56 of the holder
38, which is then in contact against the support region 60, can be
clamped between the pivot element 194 and the support region
60.
[0262] The clamping surface 198 is in spaced relation to the pivot
axis 196.
[0263] Arranged at the third region 190 of the bearing element 180
is an annular element 200. A spring device 202 is supported on the
annular element 200. The spring device 202 is further supported on
the bar body 130 at an inner side 204 thereof which is in opposing
relation to the annular element 200.
[0264] In FIGS. 5 and 8, an open position of the clamping elements
176, 178 is shown. In FIGS. 3, 4, 6, 7, 9, 10, a fixing position is
shown which corresponds to the fixing position 62 of the suction
bar 40 at the holder 38.
[0265] In said fixing position which corresponds to the fixing
position 62, the pivot element 194, via the clamping surface 198
surface thereof, urges the contact region 58 of the holding part 56
of the holder 38 against the support region 60 of the suction bar
40, thereby clamping the suction bar 40 against the holder 38 in a
force-locking manner. A force-locking connection is
established.
[0266] Here, the spring device 202 is arranged and configured such
that it tends to urge the bearing element 180 away from the inner
side 204 to thereby urge the clamping surface 198 in a direction
against the contact surface 172 at the suction bar 40. This in turn
causes the holding part 56 to be clamped between the clamping
surfaces 198 of the clamping elements 176, 178 and the bar body
130.
[0267] The spring device 202 is configured and arranged such that a
spring force 206 (cf. FIG. 9) acts in a direction away from the
inner side 204 and towards the plane of support 152.
[0268] By pivoting the pivot element 194 about the pivot axis 196
from the open position (FIG. 8) to the closed position (FIG. 9),
the bearing element 180 is displaced upwardly in the displacement
direction 182, i.e., away from the plane of support 152. The spring
device 202 is thereby tensioned. When the clamping surface 198 is
in contact against the contact region 58 of the holder 38, then on
the one hand such closed position is fixed in place by virtue of
the corresponding configuration of the clamping elements 176, 178.
On the other hand, the spring force 206 provides for the holder 38
to be clamped against the suction bar (and the clamping elements
176, 178 thereof). The corresponding fixing in place via the
clamping elements 176, 178 is force-locking in nature.
[0269] The noses 122 as the second form-locking elements have
associated therewith the first form-locking elements 124 at the
suction bar 40. The corresponding second form-locking elements 124,
which are arranged symmetrically with respect to the central plane
140 and are aligned with the noses 122, are formed as elevations
extending from the contact surface 172. They permit a form-locking
connection to be achieved in addition to the force-locking
connection that is achieved with the clamping elements 176,
178.
[0270] When the form-locking connection is established, the
blocking region 126a of a nose 122 is in contact against the
associated first form-locking element 124. Movement of the suction
bar 40 in a direction 208 is thereby blocked. The direction 208 is
a direction opposite to the direction 128.
[0271] An overload protection device is associated with the suction
bar 40. The overload protection device provides for the suction bar
40 to be partially or fully releasable from the holder 38 when an
overload situation is encountered.
[0272] By virtue of the force-locking connection of the suction bar
40 with the holder 38, a release is possible, i.e., the
force-locking connection can be released if a corresponding acting
force exceeds the force of the force lock. In particular, said
force of the force lock can be adjusted by a corresponding
configuration and arrangement of the spring device 202.
[0273] By the provision of the form-locking connection using the
form-locking elements 122, 124, an additional connection is
achieved, wherein the form locking relation can likewise be
released when an overload situation is encountered. This is
indicated by the intermediate position shown in FIG. 12. Here, the
first form-locking element 124 can be overridden by the inclined
plane 126b of the second form-locking element 122 in order to
enable a corresponding release and thereby to release the contact
therebetween with respect to the direction 208.
[0274] In particular, the first form-locking element 124 has an
elevation height above the contact surface 172, and the second
form-locking element 122 correspondingly conforms thereto so that
in an expected overload situation said overriding of the first
form-locking element 124 by the second form-locking element 122 is
possible. To this end, for example, the first form-locking element
124 has a height above the contact surface 172 which is no more
than 2 cm, and is no more than 1 cm in particular. The nose 122
correspondingly conforms therewith. In an embodiment, the elevation
height is about 0.9 cm.
[0275] A first wall 210 and a second wall 212 are arranged
symmetrically with respect to the central plane 140 at the support
region 60 of the suction bar 40, and at the ledge 156 in
particular. The first wall 210 and the second wall 212 are each
formed with an arcuate configuration. They are open upwardly and in
a direction 214. The direction 214 points towards the holder 38
when in the fixing position 62.
[0276] The walls 210, 212 are closed on a side thereof facing away
from the upper side, and are bounded by the support region 60 in
particular.
[0277] The walls 210, 212 define a receptacle 216 for the fingers
108 of the holding part 56 in each case.
[0278] The corresponding finger 108 is extended into in the
receptacle 216 when in the fixing position 62.
[0279] A fastening element 158 is positioned in the indentation 112
when in the fixing position 62 (cf. FIG. 7).
[0280] A corresponding bearing element 180 of the clamping elements
176 and 178 is located in the further indentation 118. The
respective web 114 is then positioned between the corresponding
fastening element 158 and the corresponding bearing element
180.
[0281] A rotational bearing is formed by the finger 108 and the
respective wall 210 and 212 associated therewith. A first
rotational bearing 218 (including wall 210) and a second rotational
bearing 220 are provided. The first rotational bearing 218 and the
second rotational bearing 220 are symmetrical about the central
plane 140, relative to the fixing position 62.
[0282] Under conditions of normal operation, the rotational
bearings 218, 220 have no function. They become operative in an
overload situation.
[0283] In an overload situation, the suction bar 40 can rotate at
the holder 38, and, here, while still remaining with the holder,
can rotate on the first rotational bearing 218 or on the second
rotational bearing 220, depending on the particular overload
situation. A force can thereby be avoided in order to achieve
overload protection.
[0284] The first rotational bearing 218 has associated therewith a
first axis of rotation 222. The second rotational bearing 220 has
associated therewith a second axis of rotation 224. The first axis
of rotation 222 and/or the second axis of rotation 224 are oriented
transversely, and in particular perpendicularly, to the contact
surface 64 and the contact surface 172.
[0285] They are oriented transversely, and in particular
perpendicularly, to the plane of support 152.
[0286] They are oriented transversely, and in particular
perpendicularly, to the wheel axis 32.
[0287] They are oriented transversely, and in particular
perpendicularly, to the axis of extent 136.
[0288] They extend at least near parallel (with a deviation of no
more than 10.degree.) to the central planes 106 and 140.
[0289] The rotational bearings 218, 220 are in spaced relation to
the port 82 and the housing box 66.
[0290] The cleaning machine 10 works as follows:
[0291] In a cleaning mode of operation of the cleaning machine 10,
which is a floor cleaning machine, the suction bar 40 is fixed in
place at the holder 38 when in the fixing position 62.
[0292] Cleaning liquid is applied to the floor 36 to be cleaned via
the corresponding application device 34. The one or more cleaning
tools 98 perform a mechanical cleaning action, wherein the cleaning
liquid provides improved release of dirt on the floor 36 being
cleaned.
[0293] The cleaning machine 10 is formed of self-propelled
configuration and traverses a corresponding cleaning area. Excess
liquid is sucked up via the suction bar 40. The suction unit device
42 in suction mode of operation generates a suction flow which is
applied to the suction space 154. Via corresponding recesses 226
provided in the second contact element 150b, liquid can enter the
suction space 154 whence it can be drawn off.
[0294] In cleaning mode of operation, the contact elements are
supported on the floor 36 against their plane of support 152.
[0295] Liquid being drawn in is received in the dirty fluid tank
44.
[0296] The suction bar 40 is releasable from the holder 38.
[0297] In order to fix a suction bar 40 in place on the cleaning
machine 10 after it has been removed from the latter, the clamping
elements 176, 178 are opened (FIGS. 5, 8). When in this open
position, the corresponding pivot elements 194 are pivoted such
that the respective first region 184 of the bearing elements 180 is
in contact against the support region 60.
[0298] The suction bar 40 is then inserted into the holder 38. To
this end, the tab 86 is brought into the holder receptacle 84.
Automatic positioning is thereby achieved.
[0299] The contact region 58 is in contact against the support
region 60. The corresponding fingers 108 are positioned in their
respective receptacles 216. The corresponding fastening elements
158 are located in the indentations 112.
[0300] The bearing elements 180 are positioned in the respective
further indentation 118.
[0301] The pivot elements 194 are then closed by a pivoting
movement in a pivoting direction 228 (FIG. 8). This causes the
corresponding bearing elements 180 to be displaced. The clamping
surfaces 198 are urged against the holder 38. The corresponding
spring devices 202 are tensioned. The contact region 58 is clamped
against the suction bar 40 via the clamping elements 176, 178.
[0302] The spring device 202 is tensioned.
[0303] A force-locking connection is thereby produced.
[0304] In addition, this causes the noses 122 to be placed in
contact against the first form-locking elements 124, and a form
lock is achieved with respect to the direction 208. Here, said form
lock occurs at at least two locations symmetric with respect to the
central plane 140.
[0305] By virtue of such positioning of the suction bar 40 at the
holder 38, the housing box 66 is also brought over the port 82 and
this then provides for the suction conduit 80 to be in operative
connection and fluid communication with the suction bar 40, i.e.,
for it to be in operative connection and fluid communication with
the suction space 154.
[0306] The cleaning machine 10 is now ready for suction mode of
operation.
[0307] By the provision of the tab 86 which is also formed as a
hand grip, further support is provided to the suction bar in
addition to the support thereof at the holder 38, and, here, at the
contact region 58. In particular, such further support prevents the
suction bar 40 from tilting relative to the holder 38.
[0308] In the event that the suction bar 40 in cleaning mode
collides against an obstacle and, in particular, if the
corresponding applied force is large enough, the suction bar 40,
supported on the floor 36, can rotate at the holder 38 via one of
the rotational bearings 218, 220 (depending on the applied force)
and, thus, avoid the force application. This provides a way of
"compensating" for a corresponding overload situation, thereby
accommodating the overload on the suction bar 40 or the cleaning
machine 10. The suction bar 40 can avoid the overload situation.
Damage is thereby avoided. The suction bar 40 can then fall from
the holder 38.
[0309] In a corresponding overload situation, it is also possible
for the suction bar 40 to release from the holder 38 and hence fall
from the cleaning machine 10 without prior rotation.
[0310] FIG. 12 shows a corresponding intermediate situation in
comparison to FIG. 10. In such an overload event, the force exerted
on the suction bar 40 and/or the on holder 38 is such that,
correspondingly, a nose 122 at the holder 38 can move over the
first form-locking element 124 at the suction bar 40 and override
it. The form-locking connection is thereby released and the suction
bar 40 can move relative to the holder 38 in direction 208. The
previously present contact (FIG. 10) is released, and the suction
bar 40 is thereby allowed to fall off.
[0311] The walls 210, 212 have a height H (cf. FIG. 5) above the
contact surface 172 such that a corresponding release is possible.
Since the corresponding receptacles 216 are open upwardly, a finger
108 can be brought out of the associated receptacle 216 in an
upward direction.
[0312] Furthermore, the suction bar 40 can be released at the
corresponding first rotational bearing 218, 220 by a forward
movement relative to the holder 38.
[0313] In particular, a height H of the corresponding wall 210 or
212 is no more than 5 cm, and in particular no more than 4 cm, and
in particular no more than 2 cm. In a concrete embodiment, the
height is about 1.1 cm.
[0314] The wall 210 or 212, on at least a side that faces towards
the receptacle 216, is formed with an arcuate configuration, and is
formed with a convex configuration in particular. It is thereby
possible for the respective finger 108, which is formed with
concave configuration, to effect a rolling motion for the rotary
motion capability.
[0315] Machine-side attachment of the suction bar 40 to the
cleaning machine 10 is realized via the holder 38. Such attachment
is not rigid but flexible. A combination of force-locking
connection and form-locking connection is provided. A defined
position of the suction bar 40 (the fixing position 62) can thereby
be achieved during "normal" cleaning operation of the cleaning
machine 10. When the loading imposed on said attachment exceeds a
certain threshold value, the suction bar 40 can be partially or
fully released.
[0316] Damage to objects and to the cleaning machine 10 can thereby
be prevented via the corresponding overload protection device.
[0317] If, as an example, the suction bar 40 snags onto an object
during a cleaning run, it can experience a force acting thereon
that will cause the suction bar 40 to rotate at the holder 38 via
the first rotational bearing 218 or 220. If one side of the suction
bar 40 snags, the latter rotates in a controlled manner about a
defined center of rotation which is predetermined by the first
rotational bearing 218 or the second rotational bearing 220.
[0318] In certain overload situations, the suction bar 40 can also
release from the corresponding attachment without prior
rotation.
[0319] Here, the suction conduit 80 remains with the machine. A
releasable connection is provided via the port 82 and the housing
box 66, which releasable connection allows the suction bar 40 to
partially or fully release from the holder 38.
[0320] In particular, a sensor device is provided which detects
partial or complete release of the suction bar 40 from the holder
38. A corresponding signal is then provided to an operator so that
the operator may again adjust the fixing position 62.
[0321] By virtue of the tab 86 and the associated holder receptacle
84, the suction bar 40 is prevented from tilting (angular shift) at
the holder 38.
[0322] Via the clamping elements 176, 178, a simple way is provided
for an operator to mount or dismount the suction bar 40 to or from
the holder 38. Only a small application of hand force is required
to accomplish this purpose. In particular, an overload force can be
decoupled from a force required for mounting or dismounting.
[0323] Corresponding overload forces for overload situations can be
adjusted by adapting the parameters relevant to the force-locking
connection and the form-locking connection.
[0324] In particular, the cleaning machine 10 is formed of
self-propelled configuration. In the exemplary example illustrated,
it is configured as a ride-on machine. It is also possible for the
cleaning machine 10 to be configured, for example, as a stand-on
machine or as a walk-behind machine.
[0325] In an exemplary embodiment, the cleaning machine 10
comprises a checking device 230 to check for blockage formed at a
suction path 232. It is thereby possible to recognize whether a
blockage occurs at some location within the suction path 232, such
as for example within the suction conduit 80, requiring
intervention on the part of the operator.
[0326] Correspondingly, the checking device 230 provides an
indication to the operator to show the presence or likely presence
of a blockage condition.
[0327] The checking device 230 comprises (at least) one pressure
sensor 234. In an exemplary embodiment, a further pressure sensor
236 is provided which is arranged at the fan of the suction unit
device 42.
[0328] As an example, a differential pressure measurement is
performed, wherein pressure values are measured via the pressure
sensor 234 and the further pressure sensor 236.
[0329] It is, in principle, also possible for only one pressure
sensor, such as the pressure sensor 234, to be provided and for the
necessary data to be then taken from a known characteristic curve
family.
[0330] If, then, for example, the deviation between a pressure
measurement value at the pressure sensor 234 and a fan
characteristic plot is greater than specified, it can be assumed
that a blockage is present in the suction path 232.
[0331] It is useful for a pressure measurement to be taken in the
suction space 154.
[0332] Because the suction bar 40 is releasable from the holder 38
in an overload event, it is further advantageous for the pressure
sensor 234 to be arranged in the cleaning machine 10 or at the
holder 38, and for it not to be arranged in the suction bar 40. In
an exemplary embodiment, a pressure conduit 238 is provided which
is operatively connected to the suction space 154 for fluid
communication therewith. The pressure conduit 238 leads to the
pressure sensor 234 outside of the suction space 154, and outside
of the suction bar 40 in particular. Via the pressure conduit 238,
the pressure in the suction space 154 can be determined at a
distance from the suction space 154.
[0333] In an exemplary embodiment, the pressure conduit 238 is
connected to the suction conduit 80.
[0334] In particular, then, a corresponding port for the pressure
conduit 238 is arranged at the port 82. Said port for the pressure
conduit is indicated in FIG. 5 by the reference numeral 240.
[0335] In particular, the checking device 230 can in principle also
be utilized to detect when the suction bar 40 has fully released
from the holder 38.
[0336] For example, the pressure in the suction space 154 is then
measured via the pressure sensor 234 at a distance from the suction
space 154. This is compared, via the checking device 230, with
threshold values derived, for example, from a fan characteristic
plot, and the operator is alerted to error conditions when a
threshold value is exceeded or not reached.
[0337] For example, corresponding pressure values of the fan can be
calculated from the fan characteristic plot at all operating
conditions. This provides a way of conducting a differential
pressure measurement without use of a second pressure sensor,
although, as mentioned already, a further pressure sensor 236 can
be used.
[0338] In addition, this provides a way of recognizing, for
example, whether the first contact elements 150a, 150b (suction
lips) have become worn, or of detecting the nature of ground of the
floor 36 being cleaned. For example, it is possible to provide
pressure monitoring over the life of the contact elements 150,
including corresponding evaluation of the pressure increase or of
the pressure course, averaged over different floor surfaces for
example.
[0339] As mentioned above, the checking device 230 can also be used
to detect a suction bar 40 release event.
[0340] The pressure conduit 238 remains with the machine when the
suction bar 40 is released.
[0341] Another exemplary embodiment (FIGS. 15 to 17) comprises a
holder 250. The holder 250 comprises a fastening part 252 and an
intermediate part 254. The fastening part 252 is fixed at the
chassis 12 of the corresponding floor cleaning machine. It is
mounted to the chassis 12 in a fixed manner or with capability for
height adjustment.
[0342] The intermediate part 254 is oriented at an incline to the
fastening part 252.
[0343] When in a mounted condition, the intermediate part 254 has
an underside 256 facing towards a floor 36 to be cleaned and an
upper side 258 opposite thereto.
[0344] The upper side 258 is in spaced relation to the chassis 12,
and is for example in at least near-parallel spaced relation
thereto.
[0345] Articulated to the intermediate part 254 via a pivot joint
260 is a holding part 262. The holding part 262 serves to directly
hold a suction bar 264.
[0346] In particular, the holding part 262 comprises a contact
region 266 for the suction bar 264, which contact region 266
corresponds to the contact region 58 as has been described above
for the case of the holder 38.
[0347] In principle, the suction bar 264 and the suction bar 40 can
have substantially identical configuration.
[0348] Here, it is possible for the fixing of the suction bar 264
on the holding part 262 to be carried out substantially the same
way as has been described above for the case of holder 38 and
suction bar 40. In principle, a corresponding overload protection
device can also be provided, as described before.
[0349] Furthermore, it is in principle possible for the overload
protection device to be omitted or configured differently.
[0350] The holding part 262 is articulated to the intermediate part
254 for pivotal movement with respect thereto about a pivot axis
268 via the pivot joint 260.
[0351] The intermediate part 254 forms a first part 254 of the
holder 250, and the holding part 262 forms a second part 262 of the
holder 250, wherein the second part 262 is pivotally articulated to
the first part 254 via the pivot joint 260.
[0352] The pivot axis 268 is oriented such that it is at least
approximately parallel to a plane of support of the suction bar 264
on a floor 36 to be cleaned.
[0353] The pivot axis 268 is oriented at least approximately
parallel to the wheel axis 32.
[0354] Furthermore, the pivot axis 268 is oriented transversely
and, in particular, perpendicular to the direction of forward
travel 16.
[0355] The pivot joint 260 is formed at the holder 250. In an
embodiment, the pivot joint 260 comprises a pin 270 having a collar
272. The pin 270 is located in opposing receptacles 274a, 274b in
rotationally fixed relation thereto. The receptacles 274a, 274b,
which are of loop-like configuration, are themselves located at the
holding part 262.
[0356] Located between the receptacles 274a, 274b, on the pin 270,
rotatable about the pivot axis 268, is a sleeve 276. The sleeve 276
is connected to the intermediate part 254 in rotationally fixed
relation thereto. As a result, the intermediate part 254 is
rotatable relative to the pin 270 via the sleeve 276.
[0357] Furthermore, it is in principle possible for the pin 270 to
be connected to the intermediate part 254 in rotationally fixed
relation thereto and, correspondingly, for the capability for
rotation to be achieved via corresponding rotatable mounting of the
pin 270 at corresponding receptacles 274a, 274b.
[0358] The receptacles 274a, 274b at the holding part 262 are in
spaced relation to the contact region 266 for the suction bar
264.
[0359] A locking device 278 is provided for adjusting and locking
in place a defined pivot position of the holding part 262 relative
to the intermediate part 254 (and thereby of the suction bar 264
relative to the intermediate part 254). The locking device 278
connects, in spaced relation to the pivot joint 260, the holding
part 262 to the intermediate part 254 and hence the second part 262
of the holder 250 to the first part 254 of the holder 250.
[0360] In an exemplary embodiment, the locking device 278 comprises
a pin element 280 which is formed as an adjusting screw.
[0361] Arranged between the intermediate part 254 and the holding
part 262 is a compression spring device 282 (cf. FIG. 16) which
comprises one or more compression springs. The compression spring
device 282 is supported both on the intermediate part 254, and here
on the underside 256 thereof, and on the holding part 262.
[0362] The compression spring device 282 seeks to rotate the
holding part 262 away from the intermediate part 254 in a direction
284 (FIG. 16).
[0363] A counter nut 286 is arranged at the pin element 280 via
threads. The counter nut 286 is located at or above the upper side
258 of the intermediate part 254.
[0364] Via a counter element 288 which is arranged at the pin
element 280 and which acts upon the holding part 262, an adjusted
defined pivot position at the pivot joint 260 can then be prevented
from being released.
[0365] In an embodiment, the counter element 288 has one or more
spherical washers 290 associated therewith, which spherical washers
290 can compensate for angular differences resulting from
adjustment of the pin element 280.
[0366] The pin element 280 comprises an engagement region 292 for a
tool via which it is possible to rotate the pin element 280 for
adjusting a corresponding pivot position and locking the pivot
position. The engagement region 292 is located above the upper side
258 of the intermediate part 254, and, here, in spaced relation to
the chassis 12.
[0367] Adjusting a height position of the pin element 280 at the
intermediate part 254 adjusts an angular position of the holding
part 262 at the intermediate part 254. An angular position of the
suction bar 264 fixed on the holding part 262 is thereby adjusted
relative to the intermediate part 254 or the chassis 12.
[0368] By way of example, the corresponding angular position can be
adjusted when the holder 250 is being mounted or when a servicing
operation is performed. In principle, it can also be adjusted by an
operator.
[0369] For an optimal cleaning result to be achieved, the suction
bar 264 need be oriented at the "appropriate angle" relative to the
surface 36 being cleaned. Because of production tolerances, forces
created during operation and also, for example, because of
different requirements depending on the particular type of floor, a
specific angular adjustment can be advantageous. As an example,
under operating conditions, the suction bar 264 sucks down on the
floor surface and tilts somewhat in the direction of forward travel
16. The adjustability of the angular position of the suction bar
264 relative to the chassis 12 via adjustment of the pivot position
of the holding part 262 relative to the intermediate part 254
achieves appropriate adjustment to achieve an optimal cleaning
result.
[0370] In particular, the pin element 280 (the locking device 278)
is arranged between the fastening part 252 and the suction bar 264
when the suction bar 264 is arranged at the holder 250.
[0371] As mentioned above, it is possible for the holder 250 and
the suction bar 264 to have associated therewith an overload
protection device which is configured as has been described above,
or to have a differently configured overload protection device, or
to be devoid of such overload protection device.
[0372] In particular, the holder 250 and the suction bar 264 are
combined with the overload protection device in accordance with the
invention.
[0373] The solution in accordance with the invention with respect
to the fixing device and the overload protection device can be used
on an operator-controlled floor cleaning machine (for example, on a
ride-on machine, a stand-on machine or a walk-behind machine). It
can also find use in a cleaning robot which is in particular
self-propelled and self-steering. In the same way, the solution
with respect to the adjustment of an angle of inclination of the
suction bar via a corresponding pivot joint can be used on an
operator-controlled floor cleaning machine or on a robotic
cleaner.
LIST OF REFERENCE CHARACTERS
[0374] 10 cleaning machine [0375] 12 chassis [0376] 14 rear wheel
device [0377] 16 direction of forward travel [0378] 18 left rear
wheel [0379] 20 right rear wheel [0380] 22 front wheel [0381] 24
steering wheel [0382] 26 driver's seat [0383] 28 cleaning tool
[0384] 30 axis of rotation [0385] 32 wheel axis [0386] 34
application device [0387] 36 floor to be cleaned [0388] 38 holder
[0389] 40 suction bar [0390] 42 suction unit device [0391] 44 dirty
fluid tank [0392] 46 width direction [0393] 48 rear end [0394] 50
front end [0395] 52 fastening part [0396] 54 intermediate part
[0397] 56 holding part [0398] 58 contact region [0399] 60 support
region [0400] 62 fixing position [0401] 64 contact surface [0402]
66 housing box [0403] 68 front side [0404] 70 side wall [0405] 72
lid [0406] 74 acute angle [0407] 76 interior space [0408] 78
connecting piece [0409] 80 suction conduit [0410] 82 port [0411] 84
holder receptacle [0412] 86 tab [0413] 88 front side [0414] 90 wall
[0415] 92a rear wall [0416] 92b bottom wall [0417] 92c cover wall
[0418] 94 opening [0419] 96 insertion ramp [0420] 98 direction of
insertion [0421] 100 wall [0422] 102 longitudinal direction [0423]
104 height direction [0424] 106 central plane [0425] 108 finger
[0426] 110 end face [0427] 112 indentation [0428] 114 web [0429]
116 region [0430] 118 further indentation [0431] 120 width
direction [0432] 122 nose, second form-locking element [0433] 124
first form-locking element [0434] 126a blocking region [0435] 126b
inclined plane [0436] 128 direction [0437] 130 bar body [0438] 132
first end face [0439] 134 second end face [0440] 136 axis of extent
[0441] 138 apex region [0442] 140 central plane [0443] 142 castor
wheel element [0444] 144 castor wheel [0445] 146 roller [0446] 148
hand grip [0447] 150 contact elements [0448] 150a first contact
element [0449] 150b second contact element [0450] 152 plane of
support [0451] 154 suction space [0452] 156 ledge [0453] 158
fastening element [0454] 160 elevation [0455] 162 inclined surface
[0456] 164 port mouth [0457] 166 longitudinal web [0458] 168a
transverse web [0459] 168b transverse web [0460] 170 free space
[0461] 172 contact surface [0462] 173 support surface [0463] 174
fixing device [0464] 176 first clamping element [0465] 178 second
clamping element [0466] 180 bearing element [0467] 182 direction of
displacement [0468] 184 first region [0469] 186 second region
[0470] 188 opening [0471] 190 third region [0472] 192 pivot bearing
[0473] 194 pivot element [0474] 196 pivot axis [0475] 198 clamping
surface [0476] 200 annular element [0477] 202 spring device [0478]
204 inner side [0479] 206 spring force [0480] 208 direction [0481]
210 first wall [0482] 212 second wall [0483] 214 direction [0484]
216 receptacle [0485] 218 first rotational bearing [0486] 220
second rotational bearing [0487] 222 first axis of rotation [0488]
224 second axis of rotation [0489] 226 recess [0490] 228 pivoting
direction [0491] 230 checking device [0492] 232 suction path [0493]
234 pressure sensor [0494] 236 further pressure sensor [0495] 238
pressure conduit [0496] 240 port for pressure conduit [0497] 250
holder [0498] 252 fastening part [0499] 254 intermediate part
(first part) [0500] 256 underside [0501] 258 upper side [0502] 260
pivot joint [0503] 262 holding part (second part) [0504] 264
suction bar [0505] 266 contact region [0506] 268 pivot axis [0507]
270 pin [0508] 272 collar [0509] 274a, 274b receptacle [0510] 276
sleeve [0511] 278 locking device [0512] 280 pin element [0513] 282
compression spring device [0514] 284 direction [0515] 286 counter
nut [0516] 288 counter element [0517] 290 spherical washer [0518]
292 engagement region
* * * * *