U.S. patent application number 10/416987 was filed with the patent office on 2004-03-11 for vaccum cleaner.
Invention is credited to Lindquist, Tommy, Nyberg, Curt, Sjoberg, Goran.
Application Number | 20040045124 10/416987 |
Document ID | / |
Family ID | 20281869 |
Filed Date | 2004-03-11 |
United States Patent
Application |
20040045124 |
Kind Code |
A1 |
Lindquist, Tommy ; et
al. |
March 11, 2004 |
Vaccum cleaner
Abstract
A vacuum cleaner comprising a vacuum cleaner housing (10) with a
vacuum source and an inlet (13) for dust-laden air communicating
with the vacuum source. The vaccum cleaner has a separation system
for particles separated from the airflow that is placed after the
inlet as seen in the airflow direction. The separated particles are
collected in a bag (21) of a mainly airtight material. The vaccum
cleaner is provided with a closing and/or sealing arrangement by
which a bag (21) inserted into the vaccum cleaner is closed and/or
sealed before the bag is removed from the vacuum cleaner.
Inventors: |
Lindquist, Tommy; (Farsta,
SE) ; Sjoberg, Goran; (Kungsangen, SE) ;
Nyberg, Curt; (Tyreso, SE) |
Correspondence
Address: |
PEARNE & GORDON LLP
1801 EAST 9TH STREET
SUITE 1200
CLEVELAND
OH
44114-3108
US
|
Family ID: |
20281869 |
Appl. No.: |
10/416987 |
Filed: |
June 24, 2003 |
PCT Filed: |
November 2, 2001 |
PCT NO: |
PCT/SE01/02421 |
Current U.S.
Class: |
15/347 |
Current CPC
Class: |
A47L 9/149 20130101;
A47L 9/1418 20130101; A47L 9/1683 20130101 |
Class at
Publication: |
015/347 |
International
Class: |
A47L 009/10 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 17, 2000 |
SE |
0004223-4 |
Claims
1. A vacuum cleaner comprising a vacuum cleaner housing (10) with a
vacuum source, an inlet (13) for dust-laden air communicating with
the vacuum source, and a separation system for particles separated
from an airflow that is placed after the inlet as seen in the
airflow direction, wherein the separated particles are collected in
at least one dust bag (21) of a mainly airtight material
characterized in that the vacuum cleaner is provided with a closing
and/or sealing arrangement which in its non active position is
separated from the bag and by means of which the bag (21), that at
each time is inserted into the vacuum cleaner, can be closed and/or
sealed before the bag is removed from the vacuum cleaner.
2. A vacuum cleaner according to claim 1 characterized in that the
separation system comprises a cyclone chamber with an inlet opening
for the dust laden air and an outlet for cleaned air as well as an
outlet for the separated particles the lastmentioned outlet being
arranged such that it ends in the dust bag (21).
3. A vacuum cleaner according to claim 1 or 2 characterized in that
the closing or sealing arrangement comprises clamping means (25,
41, 43, 71, 72) between which the bag (21) is clamped before it is
sealed.
4. A vacuum cleaner according to claim 3 characterized in that the
clamping means (25) is provided with electrically heated means (30)
for sealing the bag.
5. A vacuum cleaner according to claim 4 characterized in that the
vacuum cleaner further comprises a battery (32) for current supply
to the electrically heated means (30).
6. A vacuum cleaner according to claim 3 characterized in that the
clamping means (41, 43) comprises means for stretching and/or
penetrating the bag material.
7. A vacuum cleaner according to claim 6 characterized in that said
stretching and/or penetrating means comprises projecting portions
(46) and corresponding recesses (42) for stretching or penetrating
the bag.
8. A vacuum cleaner according to any of claims 1-3 characterized in
that the sealing arrangement comprises a cassette (52) with a tape
roller (53) and a tearing off device (67), the sealing being
affected by relative motion between the cassette and an opening of
the bag.
9. A vacuum cleaner according to claim 1 characterized in that it
comprises a container (20) enclosing said bag (21), the container
being provided with a cover part (23) with a cover opening (22)
through which a part of the bag is inserted, wherein the closing or
sealing arrangement is disposed in the cover part.
Description
[0001] This invention relates to a vacuum cleaner comprising a
vacuum cleaner housing with a vacuum source, an inlet for
dust-laden air communicating with the vacuum source, and a
separation system for particles separated from the airflow that is
placed after the inlet as seen in the airflow direction. The
separated particles are generally collected in a bag of a mainly
airtight material.
[0002] In conventional vacuum cleaners, dust-laden air is
transported by a vacuum source from a nozzle to a dust container in
the form of an air permeable bag. The air is filtrated so that the
dust is retained in the bag, while the cleaned air flows through
the bag material towards the vacuum source. Usually this bag is
disposable and is often provided with a closing arrangement that is
manually activated when the bag is removed from the vacuum cleaner.
Such an arrangement gives a rather hygienic handling of the bag and
its content, but the arrangement still has some disadvantages.
Because of leakage and unsatisfactory filter capacity, a leakage of
the airflow normally occurs to the outside of the bag causing dust
particles to be deposited on the outside. A further disadvantage is
that the bags are usually specially made for different vacuum
cleaner models and are sold in special stores making it difficult
for the customers to find the bags on the market.
[0003] During recent years, so-called cyclone vacuum cleaners have
appeared on the market. They are designed such that the dust
particles are separated from the airflow by means of centrifugal
separation. The dust particles are collected in a rigid container
which, when emptied, is removed from the vacuum cleaner and
transported to a dustbin. This is cumbersome as well as dirty work,
since a large amount of the dust sticks to the wall of the
container and has to be removed by manual effort. The container
also surrounds vital parts of the cyclone arrangement and manual
efforts are necessary in order to remove the interior parts of the
container before cleaning the container. This manual work causes
dust to spread to the surroundings when the container is emptied.
Thus, the arrangement is very unhygienic.
[0004] In order to create a better solution for cyclone vacuum
cleaners, the use of disposable bags in the form of airtight bags
has been suggested, see U.S. Pat. Nos. 5,145,499 and 5,090,976. The
dust is enclosed in the bag, after which the complete bag with its
content is thrown into the dustbin. However, these bags are
specially made and the handling will not be much better with these
bags since parts of the cyclone arrangement, which are placed
within the container and which press the bag towards the container
wall to prevent the bag from being sucked into the cyclone, still
have to be removed manually before the container can be
emptied.
[0005] A further development of the last-mentioned special bags is
described in W.O. No. 9,810,691. This bag has an upper portion that
can be twisted in order to close the bag before the bag is removed
from the vacuum cleaner. The bag is complicated and hence
expensive.
[0006] Emptying systems for cyclone vacuum cleaners have also been
suggested, see PCT/SE98/00240. In these systems, conventional
plastic bags are used which are retained at the container wall by
an under-atmospheric pressure created on the outside of the bag by
the vacuum source. The portions of the cyclone arrangement, which
are positioned at the upper part of the container, are easier to
remove. The outside of the bag, as well as the inside of the
container, also remains clean producing better hygienic conditions
during handling. However, this system is still not completely
hygienic, since the operator is forced to remove the bag from the
surrounding container by manual means before it can be closed, for
instance, by being tied.
[0007] This invention provides for a closing and/or a sealing
effect of a dust bag by a closing and/or sealing means built into
the vacuum cleaner. This enables a hygienic removal procedure for
the bag as well as hygienic handling of the bag. Thus, the bag can
be removed, transported, and thrown into a dustbin without any
spillage of dust.
[0008] According to the invention, the arrangement is preferably
because there is no need to touch the bag before the bag is closed
and/or sealed and subsequently removed from the container where the
bag is placed in the vacuum cleaner. This is achieved by means of a
vacuum cleaner having a housing with a vacuum source, an inlet for
dust-laden air communicating with the vacuum source, a separation
system for particles separated from the air flow that is placed
after the inlet as seen in the airflow direction, wherein the
separated particles are collected in a bag of a mainly airtight
material, and a closing and/or sealing arrangement by which the bag
inserted into the vacuum cleaner is closed and/or sealed before the
bag is removed from the vacuum cleaner.
[0009] An embodiment of the invention will now be described with
reference to the accompanying figures in which:
[0010] FIG. 1 is a schematic of a vertical section through a
cyclone vacuum cleaner having a combined closing and sealing means
according to an embodiment of the invention;
[0011] FIG. 2 is a vertical section through a part of a vacuum
cleaner equipped with a first embodiment of a combined closing and
sealing means;
[0012] FIG. 3 is a perspective view of the closing and sealing
means shown in FIG. 2;
[0013] FIG. 4 is an elevation view of the device shown in FIGS. 2
and 3;
[0014] FIG. 5 is a perspective view of a second embodiment of a
sealing device;
[0015] FIG. 6 is an elevation view of a third embodiment of a
sealing device;
[0016] FIG. 7 is a vertical section through a fourth embodiment of
a sealing device;
[0017] FIG. 8 is elevation view of a section on the line VIII-VIII
in FIG. 7; and
[0018] FIGS. 9 and 10 are the same views as FIG. 8, but with the
mechanical parts in other positions.
[0019] The vacuum cleaner shown in FIG. 1 comprises a housing 10
enclosing a vacuum source 11, such as a motor-fan unit, and a
separation part shaped as a cyclone separator 12 having an inlet 13
for dust-laden air. The inlet 13 is connected via a tube 14 to a
nozzle (not shown). The cyclone separator 12 comprises a mainly
cylindrical chamber 15 having a first and a second end wall 16 and
17, respectively. The inlet 13 is arranged near the first end wall
16 and designed such that a tangential inflow of the dust-laden air
is achieved. Centrally in the chamber 15 and close to the first end
wall 16, there is a tube-shaped outlet 18 for cleaned air. This
outlet 18 extends somewhat into the chamber 15 and is connected to
the inlet side of the motor-fan unit 11. The chamber 15 also has a
peripheral particle outlet 19 for particles separated by the
cyclone separator 12 and is placed close to the second end wall
17.
[0020] The particle outlet 19 ends in a removable, stiff collecting
container 20 in which a dust container, in the form of a bag 21, is
inserted. The bag 21 is pulled through an opening 22 in a cover
part 23 belonging to the collecting container 20 such that the
particles passing the particle outlet 19 are collected in the bag.
The bag 21 preferably consists of an airtight material, such as
plastic. The container cover 23, which also comprises a cover plate
24 (not shown in detail), encloses a closing and sealing
arrangement for the bag 21 such that the bag can first be closed
and then be sealed before it is removed from the vacuum
cleaner.
[0021] The vacuum cleaner includes two L-shaped clamping jaws 25,
as shown in FIGS. 2-4. Each L-shaped clamping jaw 25 is turnably
arranged about a shaft 26, which is arranged beside the cover
opening 22 of the container cover part 23. Each clamping jaw 25 has
a first leg 27 with a part extending outside the cover that can be
acted on manually or by some type of automatic system for turning
the clamping jaws 25 between the positions shown with the full
lines and the dashed lines in FIG. 4. Between the legs 27 of the
clamping jaws 25, there is a tension spring 28, which is placed
such that when the clamping jaws are open and in their inactive
position (FIG. 3), the tension spring 28 is positioned at one side
of a connecting line between the shafts 26. When the clamping jaws
25 are in their active, closed position (FIG. 4), the tension
spring 28 is positioned at the other side of said connecting line.
Thus, the clamping jaws 25 automatically take one of these
positions. The second legs 29 of the clamping jaws 25 are provided
with a heating thread 30 on their sides facing towards one another.
The heating thread 30 extends between the two clamping jaws and at
each side of them. The heating thread is connected to an electric
supply circuit 31 comprising one or several batteries 32 (FIG. 2)
or means for electric supply via the mains supply (not shown).
There may also electrical control means, such as switches, timers
and so on, for controlling the sealing and/or closing
arrangement.
[0022] The device according to FIGS. 1-4 operates in the following
way. When the motor-fan unit 11 is activated, dust-laden air will
flow through the inlet 13 and circulate in the chamber 15. The dust
particles will be influenced by the centrifugal forces and be
transported towards the second end wall 17 of the chamber 15 and
towards the particle outlet 19, where the particles are thrown out
through the cover opening 22 and into the bag 21 inserted through
the cover opening 22. At the same time, cleaned air flows through
the clear air outlet 18 and is transferred to atmosphere by means
of the motor-fan unit 11. In this position, the clamping jaws 25
take the position shown in FIG. 3.
[0023] When the bag 21, which in this case is a plastic bag, has
been filled and the operator wishes to change the bag, the
collecting container 20 is removed together with the bag 21 and the
container cover 23, after which the clamping jaws 25 are moved to
take the position shown in FIG. 4. Then, a switch 33 is engaged so
that that the control circuit 31 supplies a suitable current flow
from the battery 32, or some other current source, and the heating
thread 30 heats to such a temperature that a welding seal is
achieved at the plastic bag. Then, the clamping jaws 25 are moved
back to the position shown in FIG. 3, after which the container
cover 23 is removed from the collecting container 20 such that the
bag is lifted up from the collecting container 20, removed from the
container cover 23, and transported to a dustbin without spillage.
A new bag is then inserted through the cover opening 22 and
together with the container cover 23 is placed in the collecting
container 20. Of course, the closing and/or the sealing process can
be partly or completely automated, for instance, by being connected
to the removal of the collecting container 20 from the vacuum
cleaner.
[0024] With the embodiment described above, it is also possible to
desist from the sealing arrangement in question. After closing the
bag by means of the clamping jaws 25, the bag can be sealed by
manual methods, for instance, by tying up the extending part of the
bag with clips, strings, or tape around the bag, or by using
existing closing means on the bag, for instance, so-called zippers
or the like. Such an embodiment is described in FIGS. 7-10.
[0025] The sealing arrangement according to the embodiment shown in
FIG. 5 has a container cover 23 that encloses a circular bottom
plate 40 provided with a fixed clamping jaw 41 having several small
openings or recesses 42 on one side of the cover opening 22. At the
other side of the cover opening 22, there is a movable clamping jaw
43, which by two arms 44 is turnably supported at two brackets 45
arranged on the bottom plate 40. The movable clamping jaw 43 is
provided with several projections 46, which are placed such that
they will enter into the small recesses 42 when the movable
clamping jaw 43 is turned to abut the fixed clamping jaw 41.
[0026] The last-mentioned device operates in the following way when
the bag 21, which preferably is a plastic bag, is changed. The
collecting container 20 with the bag 21 is removed from the vacuum
cleaner, after which the movable clamping jaw 43 is turned from the
position shown in FIG. 5 to a position where it rests on the fixed
clamping jaw 41 and an area around the bag opening is clamped
between the two clamping jaws 41, 43. Further pressing forces of
the movable clamping jaw 43 causes the projections 46 to stretch,
penetrate, and/or deform the bag material when they enter into the
recesses 42 such that the bag will be closed. The upper part of the
bag with the seal is then pulled out through the cover opening 22
and transported to a dustbin, after which a new bag is inserted
through the cover opening 22 and together with the container cover
23 is placed in the collecting container 20.
[0027] In the sealing arrangement shown in FIG. 6, which can be
used for all types of bags, the container cover 23 is provided with
a rectangular bottom plate 50 having guides 51 on which a cassette
52 is slidably arranged. The cassette 52 comprises a tape on a
first roller 53 rotatably arranged on a first holder 54. The tape
is pulled out above a notched wheel 55 with the gluing surface
facing outwards from the wheel. The notched wheel 55 is arranged in
close vicinity of a slot-shaped opening 56 of the cassette 52,
where one end of the slot-shaped opening 56 faces against the cover
opening 22 in the bottom plate 50 through which the bag is
partially inserted. The notched wheel 55 is placed such that its
notches mainly overbridge the slot-shaped opening 56. The other end
of the slot-shaped opening 56 continues into an extension 57, the
purpose of which will be explained below. The cassette 52 comprises
a second roller 58 having a strip-shaped non-gluing material, which
is rotatably supported on a second holder 59, with the strip
extending through an outlet opening 60 into the slot-shaped opening
56. The cassette 52 also encloses a L-shaped tilting arm 61
turnably supported on an arm shaft 62 and having a first arm leg
63, which via an arm tension spring 64 is connected to the housing
of the cassette 52 such that the first arm leg 63 normally rests
against a stop means 65. The second leg 66 of the tilting arm is
placed such that it normally overbridges the slot-shaped opening
56. The first arm leg 63 is also provided with a cutting edge
67.
[0028] The device shown in FIG. 6 operates in the following manner.
When the collecting container 20 with the container cover 23 has
been removed from the vacuum cleaner, the cassette 52 is moved
towards the left in FIG. 6 along the guides 51. The area around the
bag opening is inserted into the slot-shaped opening 56 of the
cassette, so that the bag material is pressed together by the
notched wheel 55 at the same time as the tape with its gluing
surface abuts the bag material and at the same time the
strip-shaped material is pulled out from the second roller 58 since
its end is glued to the outer end of the tape. Thus, the tape and
the strip-shaped material surround the bag 21 from each side. When
the notched wheel has passed the bag, the tape again engages the
strip-shaped material and adheres to it at the same time as the
strip-shaped material and the tape are pulled out. Thus, the bag is
sealed. Further movement of the cassette 52 causes the bag to
engage the second leg 66 of the tilting arm 61 such that it turns
anticlockwise in FIG. 6. The knife-shaped means 67 enters into the
slot-shaped opening 56 and cuts the tape glued to the strip-shaped
material such that there remains material glued together that is
connected to the strip-shaped material on the second roller 58 as
well as the tape on the first roller 53. The cassette 52 is then
moved such that the bag opening, when the container cover 23 is
lifted from the collection container 20, is pulled out through the
extension 57, after which the bag is removed from the collecting
container 20 and the cassette 52 is moved back to its original
position.
[0029] In the embodiment shown in FIGS. 7-10, the vacuum cleaner
has a particle outlet 19 comprising a projecting sleeve 70
extending through the cover plate 24 and the cover opening 22 of
the cover part 23 into the collecting container 20. The collecting
container 20 is provided with a bag 21, for instance, a
conventional plastic bag. The bag opening is inserted through the
cover part 23 and folded outwardly around the sleeve 70 between the
cover plate 24 and the housing 10 of the vacuum cleaner such that
the bag is clamped between the sleeve 70 and the surrounding
periphery of the cover opening 22. The vacuum cleaner housing 10 is
arranged such that the housing together with the sleeve 70 can be
moved vertically in FIG. 7, with respect to the collecting
container 20 and the cover part 23, when the bag is closed. The
cover part 23 (in a manner not shown) is lifted up or turned up
from the collecting container 20 in order to uncover the bag
21.
[0030] The cover part 23 comprises a first and a second clamping
jaw 71, 72, respectively, which are connected to one another each
via a first and a second notched wheel 73, 74, respectively. The
wheels engage one another and synchronize a turning motion of the
first and second clamping jaws towards and away from one another.
Each clamping jaw 71, 72 with associated notched wheel 73, 74, are
turnable around jaw shafts 75, 76. The two clamping jaws 71, 72 are
via a jaw tension spring 77 connected to one another such that the
line of action of the spring at different positions of the clamping
jaws 71, 72 are placed at different sides of a line between the
centers of the jaw shafts 75, 76. The first clamping jaws 71 also
has an operating arm 78 extending outwardly from the cover part 23,
which is acted on by a shoulder 79 belonging to the vacuum cleaner
housing 10.
[0031] The closing device shown in FIGS. 7-10 operates in the
following manner. At the position shown in FIGS. 7 and 8, which is
the normal operating position for the vacuum cleaner, the clamping
jaws 71 and 72 abut the outside of the bag 21 and press the bag
towards the sleeve 70 by the jaw spring 77, and the dust particles
flow through the sleeve 70 into the bag 21. When the bag 21 is
changed, the housing 10 is removed. The shoulder 79 and the sleeve
70 are removed from the cover part 23 and the jaw spring 77 turns
the clamping jaws 71, 72 towards one another such that the bag 21
is clamped between the jaws, see FIG. 9. The clamping jaws 71, 72
are designed such that they cover the complete cover opening 22
enabling the dust container to be separated from the surrounding in
a hygienic manner. It is now possible to seal the bag opening
manually, for instance, by tying with tape, clips, a string around
the bag, or activating a sealing device arranged on the bag, for
instance, a so-called zip-arrangement. The cover part 23 is then
lifted up from the collecting container 20 and the sealed bag is
removed and transported to a dustbin or the like.
[0032] The operator then acts on the operating arm 78 such that the
clamping jaws 71, 72 are turned away from one another and are moved
to the position shown in FIG. 10. In this position, the action line
of the jaw spring 77 is placed at the other side of a connecting
line between the centers of the jaw shafts 75,76. The clamping jaws
71, 72, in this stable position, abut the periphery of the cover
part 23 and the cover opening 22 becomes uncovered. A new bag is
inserted from below into the opening in the cover part 23 and the
associated cover plate 24, before the bag is inserted into the
collecting container 20, and the cover part 23 with the cover plate
24 is applied to the container. When the housing 10 of the vacuum
cleaner is then applied to the collecting container 20, the sleeve
70 again enters through the cover opening 22 at the same time as
the shoulder 79 engages the operating arm 78 such that it is moved
counterclockwise in FIG. 8. The action line of the jaw spring 77
thereby moves back to the first side of the connecting line between
the turning centers of the jaw shafts 75, 76. Thus, the clamping
jaws 71, 72 under the influence of the jaw spring 77 move toward
one another and again clamp the bag against the sleeve 70.
[0033] The closing arrangement shown in FIGS. 7-10 might also, in a
manner mentioned in association to the embodiment according to
FIGS. 1-4, be completed with a sealing arrangement. It is possible
with the embodiment shown in FIGS. 7-10 to also desist from using a
bag. An operator may instead collect the dust directly into the
collecting container 20 and, in a hygienic manner, transport the
closed collecting container 20 together with the cover part 23 to a
dustbin. The cover part 23 may then be removed from the collecting
container 20, after which the container can be emptied into the
dustbin. It would also be possible to use an arrangement where the
bag can be taken out from the collecting container before it is
closed and/or sealed. This may occur as long as the communication
between the interior of the bag and the particle outlet of the
separation system is maintained such that particles in the dust bag
do not escape outside the vacuum cleaner when forces are applied on
the bag.
[0034] The closing and sealing arrangements described above are
primary intended to be used together with cyclone vacuum cleaners
to seal airtight bags in the form of conventional plastic bags that
are available on the market. However, the three last-mentioned
embodiments may also be used with other bags, for example, paper
bags. The expression "closing arrangement" in this connection
generally means a device for temporarily closing the bag opening to
prevent dust particles from leaving through the bag opening under
the initial period of the bag changing procedure. The expression
"sealing arrangement" generally means a device for permanently
sealing of the bag opening such that the bag in a hygienic manner
can be taken out of the collecting container and be moved to a
dustbin or the like
[0035] While the invention has been described with reference to
specific embodiments, various changes may be made and equivalents
may be substituted for elements thereof by those skilled in the art
without departing from the scope of the invention. In addition,
other modifications may be made to adapt a particular situation or
method to the teachings of the invention without departing from the
essential scope thereof. The present invention herein is not to be
construed as being limited, except insofar as indicated in the
appended claims.
* * * * *