U.S. patent application number 14/084338 was filed with the patent office on 2016-01-14 for tool attachment for a hand-held machine tool.
This patent application is currently assigned to Robert Bosch GmbH. The applicant listed for this patent is Torsten Tussing. Invention is credited to Torsten Tussing.
Application Number | 20160008893 14/084338 |
Document ID | / |
Family ID | 50625757 |
Filed Date | 2016-01-14 |
United States Patent
Application |
20160008893 |
Kind Code |
A9 |
Tussing; Torsten |
January 14, 2016 |
TOOL ATTACHMENT FOR A HAND-HELD MACHINE TOOL
Abstract
In a tool attachment for fastening to a fastening interface of a
hand-held machine tool, having a locking unit which in an unlocked
state makes it possible for the tool attachment to be placed on the
fastening interface of the hand-held machine tool and in a locked
state makes it possible for the tool attachment to be locked to the
fastening interface of the hand-held machine tool for operation,
the locking unit having a rotatable locking body, and a first
rotational position of the locking body being associated with the
unlocked state and a second rotational position of the locking body
being associated with the locked state, the locking unit has a
locking member which is configured to prevent rotation of the
locking body from the second rotational position into the first
rotational position in the locked state.
Inventors: |
Tussing; Torsten;
(Illertissen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Tussing; Torsten |
Illertissen |
|
DE |
|
|
Assignee: |
Robert Bosch GmbH
Stuttgart
DE
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20150115554 A1 |
April 30, 2015 |
|
|
Family ID: |
50625757 |
Appl. No.: |
14/084338 |
Filed: |
November 19, 2013 |
Current U.S.
Class: |
279/140 |
Current CPC
Class: |
Y10T 279/17615 20150115;
Y10T 279/32 20150115; B23B 31/12 20130101; B23B 31/123 20130101;
B23B 2240/04 20130101; Y10T 408/95 20150115; B25F 3/00
20130101 |
International
Class: |
B23B 31/12 20060101
B23B031/12 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 22, 2012 |
DE |
10 2012 221 320.1 |
Jul 15, 2013 |
DE |
10 2013 213 804.0 |
Claims
1. A tool attachment for fastening to a fastening interface of a
hand-held machine tool, comprising: a locking unit which in an
unlocked state makes it possible for the tool attachment to be
placed on the fastening interface of the hand-held machine tool and
in a locked state makes it possible for the tool attachment to be
locked to the fastening interface of the hand-held machine tool for
operation, the locking unit having a rotatable locking body, and a
first rotational position of the locking body being associated with
the unlocked state and a second rotational position of the locking
body being associated with the locked state, wherein the locking
unit has a locking member which is configured to prevent rotation
of the locking body from the second rotational position into the
first rotational position in the locked state.
2. The tool attachment according to claim 1, wherein the locking
member is configured to cooperate in the locked state with a
locking element associated with the fastening interface of the
hand-held machine tool.
3. The tool attachment according to claim 2, wherein the locking
element has at least one set of locking teeth.
4. The tool attachment according to claim 3, wherein the locking
member is of a resilient configuration at least in regions and has
at least one locking portion which in the locked state is urged
toward the fastening interface of the hand-held machine tool by an
elastic deformation of the locking member.
5. The tool attachment according to claim 4, wherein the locking
portion is configured to engage the set of locking teeth in order
to prevent the rotation of the locking body from the second
rotational position into the first rotational position.
6. The tool attachment according to claim 1, wherein the locking
unit has an actuating element which is configured to make possible
a rotation of the locking body from the first into the second
rotational position.
7. The tool attachment according to claim 6, wherein the locking
body is at least partly tubular and the actuating element is
rotatably supported on an outer periphery of the locking body.
8. The tool attachment according to claim 6, wherein at least one
driver element is provided on the actuating element and at least
one driven member is provided on the locking body, the driver
element and the driven member being configured to cooperate for
rotary entrainment of the locking body upon actuation of the
actuating element to rotate the locking body from the first into
the second rotational position.
9. The tool attachment according to claim 8, wherein the driven
member is configured to make possible a rotational movement of the
actuating element relative to the locking body at least by a
predetermined rotation angle.
10. The tool attachment according to claim 6, wherein the actuating
element is configured to urge the locking member in the locked
state at least in portions toward the fastening interface of the
hand-held machine tool.
11. The tool attachment according to claim 10, wherein the
actuating element has a control curve which is configured to enable
the locking member to be urged at least in portions toward the
fastening interface of the hand-held machine tool in the locked
state.
12. The tool attachment according to claim 6, wherein there is
associated with the actuating element a blocking member which is
configured to block the actuating element in a blocking position at
the locking body in the locked state, in which blocking position
the actuating element urges the locking member at least in portions
toward the fastening interface of the hand-held machine tool.
13. The tool attachment according to claim 12, wherein the blocking
member is of a resilient configuration at least in regions and has
a blocking portion which in the blocking position may be releasably
fixed in a fixing member provided on the locking body.
14. The tool attachment according to claim 13, wherein the fixing
member is configured in the manner of a recess and the blocking
portion is configured to snap into the fixing member in the
blocking position in order to prevent automatic rotation of the
actuating element relative to the locking body in the locked
state.
15. The tool attachment according to claim 12, wherein the locking
member and the blocking member are constructed in one piece.
16. The tool attachment according to claim 1, wherein the locking
body has locking elements which are configured in the manner of
bayonets to form a bayonet connection with the fastening interface
of the hand-held machine tool.
17. A hand-held machine tool, comprising: a fastening interface for
fastening of a tool attachment which has a locking body which is
lockable to the fastening interface, wherein there is associated
with the fastening interface a locking element which is configured
to lock a rotationally secured locking of the locking body of the
tool attachment to the fastening interface.
18. A tool system, comprising: a hand-held machine tool which has a
fastening interface, and a tool attachment for fastening to the
fastening interface of the hand-held machine tool, the tool
attachment having a locking unit which in an unlocked state makes
it possible for the tool attachment to be placed on the fastening
interface of the hand-held machine tool and in a locked state makes
it possible for the tool attachment to be locked to the fastening
interface of the hand-held machine tool for operation, the locking
unit having a rotatable locking body which in the unlocked state is
disposed in a first rotational position and in the locked state is
disposed in a second rotational position on the fastening interface
of the hand-held machine tool, wherein the locking unit has a
locking member which is configured to prevent rotation of the
locking body from the second rotational position into the first
rotational position in the locked state.
19. A hand-held machine tool, comprising: a fastening interface for
rotationally secured fastening of a tool attachment, wherein the
fastening interface is fastened to a gear unit housing of the
hand-held machine tool.
20. The hand-held machine tool according to claim 19, further
comprising: a tool holder for receiving an inserted tool, which
tool holder has a spring-loaded locking sleeve for locking the
inserted tool, wherein the locking sleeve may be pushed at least
partly into the fastening interface.
21. The hand-held machine tool according to claim 19, wherein the
fastening interface is configured to enable a fastening of the tool
attachment to the gear unit housing, which fastening is oriented in
a predetermined angular position.
22. The hand-held machine tool according to claim 19, wherein an at
least partly conical centering aid is provided at the fastening
interface for axial centering of the tool attachment.
23. The hand-held machine tool according to claim 19, wherein there
is associated with the fastening interface a locking element which
is configured to lock a rotationally secured locking, to the
fastening interface, of a locking body of the tool attachment,
which locking body is lockable to the fastening interface.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to Application No.
DE 10 2012 221 320.1, filed in the Federal Republic of Germany on
Nov. 22, 2012, and Application No. DE 10 2013 213 804.0, filed in
the Federal Republic of Germany on Jul. 15, 2013, the contents of
each of which are expressly incorporated herein by reference
thereto.
FIELD OF INVENTION
[0002] The present invention relates to a tool attachment for
fastening to a fastening interface of a hand-held machine tool,
having a locking unit which in an unlocked state makes it possible
for the tool attachment to be placed on the fastening interface of
the hand-held machine tool and in a locked state makes it possible
for the tool attachment to be locked to the fastening interface of
the hand-held machine tool for operation, the locking unit having a
rotatable locking body which in the unlocked state is disposed in a
first rotational position and in the locked state is disposed in a
second rotational position on the fastening interface of the
hand-held machine tool.
BACKGROUND INFORMATION
[0003] A tool attachment which has a locking unit for fastening to
a fastening interface of a hand-held machine tool is known from the
related art. That locking unit serves to lock the tool attachment
to the hand-held machine tool in an associated locked state in
order to render possible operation of the tool attachment on the
hand-held machine tool by transfer of a driving torque from the
hand-held machine tool to the tool attachment. For that purpose,
the locking unit has a rotatable locking body on which locking
elements configured in the manner of bayonets are provided to form
a bayonet connection with the fastening interface of the hand-held
machine tool.
[0004] A disadvantage with the related art is that such a bayonet
connection may come undone automatically as a result of vibrations
which occur in operation of the hand-held machine tool. That may
result in damage to the tool attachment and/or to the hand-held
machine tool and also in injuries to the user of the hand-held
machine tool.
SUMMARY
[0005] It is therefore an object of the present invention to
provide a novel tool attachment for fastening to a fastening
interface of a hand-held machine tool, with which, after locking to
the fastening interface of the hand-held machine tool, automatic
detachment therefrom may be prevented.
[0006] That object is attained by a tool attachment for fastening
to a fastening interface of a hand-held machine tool, having a
locking unit which in an unlocked state makes it possible for the
tool attachment to be placed on the fastening interface of the
hand-held machine tool and in a locked state makes it possible for
the tool attachment to be locked to the fastening interface of the
hand-held machine tool for operation. The locking unit has a
rotatable locking body, a first rotational position of the locking
body being associated with the unlocked state and a second
rotational position of the locking body being associated with the
locked state. The locking unit has a locking member which is
configured to prevent rotation of the locking body from the second
rotational position into the first rotational position in the
locked stated.
[0007] The present invention accordingly makes it possible to
provide a tool attachment with which, in operation of an associated
hand-held machine tool to which the tool attachment is locked in
the locked state, an automatic detachment of the locking body of
the tool attachment from the fastening interface of the hand-held
machine tool may be safely and reliably prevented by the locking
member.
[0008] According to one exemplary embodiment, the locking member is
configured to cooperate in the locked state with a locking element
associated with the fastening interface of the hand-held machine
tool.
[0009] It is thus possible to provide in a simple manner a stable
and robust locking arrangement.
[0010] The locking element has preferably at least one set of
locking teeth.
[0011] It is thus possible to provide a locking element that may be
produced quickly and in an uncomplicated manner.
[0012] According to one exemplary embodiment, the locking member is
of a resilient configuration at least in regions and has at least
one locking portion which in the locked state is urged toward the
fastening interface of the hand-held machine tool by an elastic
deformation of the locking member.
[0013] The present invention thus makes it possible to provide a
locking member that is safe in operation and inexpensive.
[0014] Preferably, the locking portion is configured to engage the
set of locking teeth in the locked state in order to prevent the
rotation of the locking body from the second rotational position
into the first rotational position.
[0015] Thus, a safe and robust blocking of an automatic rotation of
the locking body in the locked state of the locking unit may be
made possible.
[0016] According to one exemplary embodiment, the locking unit has
an actuating element which is configured to make possible a
rotation of the locking body from the first into the second
rotational position.
[0017] The present invention thus makes it possible to provide a
tool attachment whose locking unit is configured for simple and
user-friendly handling.
[0018] The locking body is preferably at least partly tubular and
the actuating element is rotatably supported on the outer periphery
of the locking body.
[0019] Thus, stable and uncomplicated supporting of the actuating
element on the locking body may be made possible.
[0020] According to one exemplary embodiment, at least one driver
element is provided on the actuating element and at least one
driven member is provided on the locking body, the driver element
and the driven member being configured to cooperate for rotary
entrainment of the locking body upon actuation of the actuating
element to rotate the locking body from the first into the second
rotational position.
[0021] The present invention thus makes it possible to provide a
tool attachment in which safe and reliable rotary entrainment of
the locking body by the actuating element may be ensured.
[0022] Preferably, the driven member is configured to make possible
a rotational movement of the actuating element relative to the
locking body at least by a predetermined rotation angle.
[0023] Thus, a relative movement between actuating element and
locking body may be made possible, which relative movement may be
used according to the present invention to activate or deactivate
the locking member.
[0024] The actuating element is preferably configured to urge the
locking member in the locked state at least in portions toward the
fastening interface of the hand-held machine tool.
[0025] Thus, the locking function of the locking member in the
locked state of the locking unit may be effectively maintained by
the actuating element.
[0026] Preferably, the actuating element has a control curve which
is configured to enable the locking member to be urged at least in
portions toward the fastening interface of the hand-held machine
tool in the locked state.
[0027] Thus, a stable urging of the locking member in the locked
state of the locking unit may be made possible in a simple
manner.
[0028] According to one exemplary embodiment, there is associated
with the actuating element a blocking member which is configured to
block the actuating element in a blocking position at the locking
body in the locked state, in which blocking position the actuating
element urges the locking member at least in portions toward the
fastening interface of the hand-held machine tool.
[0029] The present invention thus makes it possible to provide a
tool attachment in which the actuating element may be safely and
reliably blocked at the locking body upon urging of the locking
member.
[0030] The blocking member is preferably of a resilient
configuration at least in regions and has a blocking portion which
in the blocking position may be releasably fixed in a fixing member
provided on the locking body.
[0031] Thus, a robust and inexpensive blocking member may be
provided.
[0032] Preferably, the fixing member is configured in the manner of
a recess and the blocking portion is configured to snap into the
fixing member in the blocking position in order to prevent
automatic rotation of the actuating element relative to the locking
body in the locked state.
[0033] Thus, an operationally safe and reliable engagement of the
actuating element at the locking body may be made possible.
[0034] The locking member and the blocking member are preferably
constructed in one piece.
[0035] Thus, a simple and inexpensive single component may be used
to implement the locking member and the blocking member.
[0036] According to one exemplary embodiment, the locking body has
locking elements which are configured in the manner of bayonets to
form a bayonet connection with the fastening interface of the
hand-held machine tool.
[0037] The present invention thus makes it possible to provide a
tool attachment that is safely and reliably connectable to the
fastening interface of the hand-held machine tool by a robust and
stable bayonet connection.
[0038] The object mentioned in the introduction is also attained by
a hand-held machine tool having a fastening interface for fastening
of a tool attachment which has a locking body which is lockable to
the fastening interface. There is associated with the fastening
interface a locking element which is configured to lock a
rotationally secured locking of the locking body of the tool
attachment to the fastening interface.
[0039] Furthermore, the object mentioned in the introduction is
also attained by a tool system having a hand-held machine tool
which has a fastening interface, and having a tool attachment for
fastening to the fastening interface of the hand-held machine tool.
The tool attachment has a locking unit which in an unlocked state
makes it possible for the tool attachment to be placed on the
fastening interface of the hand-held machine tool and in a locked
state makes it possible for the tool attachment to be locked to the
fastening interface of the hand-held machine tool for operation.
The locking unit has a rotatable locking body which in the unlocked
state is disposed in a first rotational position and in the locked
state is disposed in a second rotational position on the fastening
interface of the hand-held machine tool. The locking unit has a
locking member which is configured to prevent rotation of the
locking body from the second rotational position into the first
rotational position in the locked state.
[0040] In addition, the object mentioned in the introduction is
also attained by a hand-held machine tool having a fastening
interface for rotationally secured fastening of a tool attachment,
wherein the fastening interface is fastened to a gear unit housing
of the hand-held machine tool.
[0041] The present invention thus makes it possible to provide a
hand-held machine tool of a compact and robust construction.
[0042] Preferably, the hand-held machine tool has a tool holder for
receiving an inserted tool, which tool holder has a spring-loaded
locking sleeve for locking the inserted tool, wherein the locking
sleeve may be pushed at least partly into the fastening
interface.
[0043] Thus, it is possible to provide a hand-held machine tool of
a shorter overall length.
[0044] Preferably, the fastening interface is configured to enable
a fastening of the tool attachment to the gear unit housing, which
fastening is oriented in a predetermined angular position.
[0045] Thus, an application-specific orientation of the tool
attachment on the hand-held machine tool may be made possible in a
simple manner.
[0046] Preferably, an at least partly conical centering aid is
provided at the fastening interface for axial centering of the tool
attachment.
[0047] Thus, a stable and reliable axial centering of the tool
attachment on the hand-held machine tool may be made possible.
[0048] Preferably, there is associated with the fastening interface
a locking element which is configured to lock a rotationally
secured locking, to the fastening interface, of a locking body of
the tool attachment, which locking body is lockable to the
fastening interface.
[0049] It is thus possible for automatic detachment of the locking
body of the tool attachment from the fastening interface of the
hand-held machine tool in operation thereof to be safely and
reliably prevented by the locking member.
[0050] Exemplary embodiments of the present invention are described
in detail in the following with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0051] FIG. 1 shows a schematic view of a hand-held machine tool
with a tool holder and a fastening interface according to one
exemplary embodiment.
[0052] FIG. 2 shows a sectional view of a tool attachment that may
be fastened to the fastening interface of the hand-held machine
tool of FIG. 1, having a locking body and an actuating element
according to one exemplary embodiment.
[0053] FIG. 3 shows a perspective view of the locking body of FIG.
2.
[0054] FIG. 4 shows a perspective view of the locking body of FIG.
3 with a locking member according to one exemplary embodiment.
[0055] FIG. 5 shows a perspective view of the locking body of FIG.
4 with a blocking member according to one exemplary embodiment.
[0056] FIG. 6 shows a perspective view of the actuating element of
FIG. 2 according to one exemplary embodiment, with the locking
member of FIG. 4 and the blocking member of FIG. 5.
[0057] FIG. 7 shows a perspective view of the actuating element of
FIG. 6.
[0058] FIG. 8 shows a perspective view of the actuating element of
FIG. 6, without the locking member of FIG. 4.
[0059] FIG. 9 shows a sectional view of the actuating element of
FIG. 2 supported on the locking body of FIG. 2.
[0060] FIG. 10 shows a sectional view of a tool system according to
one exemplary embodiment, with the tool attachment of FIG. 2 placed
on the hand-held machine tool of FIG. 1.
[0061] FIG. 11 shows a sectional view of the tool system of FIG. 10
upon locking of the tool attachment to the hand-held machine
tool.
[0062] FIG. 12 shows a sectional view of a tool system according to
one exemplary embodiment, with the tool attachment of FIG. 2 having
a locking unit configured according to an alternative exemplary
embodiment, placed on the hand-held machine tool of FIG. 1.
[0063] FIG. 13 shows a sectional view of a tool attachment
according to an alternative exemplary embodiment, with a fastening
interface for fastening to the hand-held machine tool of FIG.
1.
[0064] FIG. 14 shows a sectional view of a tool system according to
an alternative exemplary embodiment, with the tool attachment of
FIG. 13 fastened to the hand-held machine tool of FIG. 1.
DETAILED DESCRIPTION
[0065] FIG. 1 shows a hand-held machine tool 100 provided with a
tool holder 140 and having a housing 110 with a hand grip 126, and
also shows an enlarged detail of hand-held machine tool 100.
According to one exemplary embodiment, hand-held machine tool 100
is mechanically and electrically connectable to a battery pack 130
for mains-independent power supply.
[0066] Hand-held machine tool 100 is configured by way of example
as a battery-powered rotary impact screwdriver. It is pointed out,
however, that the present invention is not limited to
battery-powered rotary impact screwdrivers but rather may be used
in different hand-held machine tools having a tool holder
corresponding to tool holder 140, irrespective of whether the
hand-held machine tool is operable electrically, that is,
mains-independently using battery pack 130 or mains-dependently,
and/or non-electrically.
[0067] Disposed in housing 110 are an electric drive motor 114
supplied with power by battery pack 130, and a gear unit 118 and an
optional impact mechanism 122. Drive motor 114 is operable, that
is, may be switched on or off, by a manual switch 128, for example,
and is preferably electronically controllable by closed or open
loop control such that both reversing operation and settings in
respect of a desired speed of rotation may be implemented.
[0068] According to one exemplary embodiment, drive motor 114 is an
electronically commutated drive motor, preferably a DC motor having
by way of illustration stator and rotor components 111 and 117
respectively. In this case, stator components 111 form by way of
example an outer stator and rotor components 117 form by way of
example an inner rotor. It is pointed out, however, that the
description of a drive motor constructed in the manner of an
electronically commutated drive motor with outer stator and inner
rotor is purely of an illustrative nature and is not to be
construed as a limitation of the present invention which may also
be used in the case of a drive motor having an inner stator and an
outer rotor or, for example, in the case of a commutator motor
having brushes.
[0069] Drive motor 114 is connected via an associated motor shaft
116 to gear unit 118 which converts rotation of motor shaft 116
into rotation of a drive member 120, for example a drive shaft,
provided between gear unit 118 and impact mechanism 122. That
conversion preferably takes place such that drive member 120
rotates relative to motor shaft 116 with an increased torque but at
a reduced speed of rotation. By way of illustration, drive motor
114 is disposed in a motor housing 115 and gear unit 118 is
disposed in a gear unit housing 119, gear unit housing 119 and
motor housing 115 being disposed by way of example in housing
110.
[0070] Optional impact mechanism 122 which is connected to drive
member 120 is by way of example a rotary impact mechanism which
produces high-intensity impact-like rotary pulses and transmits
them to a drive shaft 124, for example a drive spindle. An example
of an impact mechanism with which impact mechanism 122 may be
implemented is described in German Utility Model DE 20 2006 014 850
U1 to which reference is explicitly made here and the teachings of
which are incorporated herein by reference and are to be understood
as forming part of the present description, so that a detailed
description of impact mechanism 122 may be dispensed with here for
conciseness.
[0071] Constructed at drive shaft 124 is tool holder 140 which by
way of illustration has a receiving body 147 with internal
polygonal receptacle 148 which is provided to receive inserted
tools with external polygonal couplings. On the outer periphery of
receiving body 147, which is rotationally rigidly connected and/or
integrally connected, for example, to drive shaft 124, there is
disposed by way of example a locking sleeve 149 for locking
suitable inserted tools in internal polygonal receptacle 148, which
locking sleeve 149 is spring-loaded by a spring element in an axial
direction 199 pointing away from hand-held machine tool 100.
[0072] Tool holder 140 is constructed by way of example in the
manner of a bit holder, that is, for receiving an inserted tool 170
which is constructed in the manner of a screwdriver bit and which
is pushed into internal polygonal receptacle 148 in the direction
of hand-held machine tool 100 as indicated by an arrow 198. A
screwdriver bit of that kind, which, for example, is of the
so-called HEX type, is sufficiently known from the related art and
therefore a detailed description will be dispensed with here for
conciseness. It is pointed out, however, that the present invention
is not limited to use of a HEX screwdriver bit, but rather other
inserted tools may also be used depending on a respectively
selected configuration of tool holder 140, for example HEX drills
or so-called SDS Quick insert tools. It is furthermore pointed out
that the structure and mode of operation of a suitable bit holder
will also be sufficiently known to a person skilled in the art and
therefore a detailed description of bit holder 140 may be dispensed
with here for conciseness.
[0073] According to one exemplary embodiment, there is associated
with hand-held machine tool 100 a fastening interface 150 which by
way of illustration is fastened to housing 110 in an axially and
radially immovable manner in the region of bit holder 140 and which
is referred to hereinafter for clarity of the description as
"machine interface 150". It is pointed out, however, that machine
interface 150 is constructed as a separate component merely by way
of example and may alternatively be constructed in one piece with
housing 110.
[0074] Machine interface 150 serves to fasten an associated tool
attachment (200 in FIG. 2) in a rotationally secured manner, which
tool attachment may, for example, be constructed in the manner of a
drill chuck, an angle attachment or an eccentric attachment. By way
of illustration, machine interface 150 has a fastening element 151
which is fastened to a front face 112 of housing 110 in a
rotationally secured manner. Fastening element 151 is by way of
example at least partly sleeve-shaped or ring-shaped, and is
fastened in the region of a terminating or protective sleeve 158
disposed annularly on housing 110 at front face 112 by suitable
fastening members, for example screws or rivets, but may
alternatively be constructed in one piece with housing 110.
Fastening element 151 preferably at least partly surrounds bit
holder 140 at a predetermined radial spacing in order to allow
axial displacement of locking sleeve 149 of bit holder 140 in the
interior of fastening element 151.
[0075] According to one exemplary embodiment, fastening element 151
has at its outer periphery at least one locking element 155 and at
least two retaining members 152, 154. Locking element 155
preferably has at least one set of locking teeth 156 and the at
least two retaining members 152, 154 are constructed by way of
example in the manner of bayonets to form a bayonet connection. It
is pointed out, however, that the description of such a bayonet
connection is merely of an illustrative nature and does not serve
to limit the present invention. Rather, alternative fastening
possibilities may also be used in the case of machine interface
150, in which a corresponding tool attachment (200 in FIG. 2) may
be fastened to machine interface 150 by a rotational movement, for
example a so-called wire bail latch, etc.
[0076] By way of illustration, there is provided at machine
interface 150 an at least partly conical centering aid 153 for
axial centering of a locking unit (202 in FIG. 2) of an associated
tool attachment (200 in FIG. 2), fastening element 151 being
configured to enable the associated tool attachment (200 in FIG. 2)
to be axially centered at housing 110. For that purpose, there is
provided on the inner periphery of fastening element 151 a
centering surface 159, which by way of example is annular and at
least partly funnel-shaped, to form centering aid 153.
[0077] It is pointed out, however, that centering surface 159 is
funnel-shaped only by way of example and not as a limitation of the
present invention. Rather, it is also possible to implement a
cone-shaped configuration at an additional centering ring.
Accordingly, any reference to the term "conical" in the context of
the present invention represents a reference both to a cone-shaped
and to a funnel-shaped configuration of a corresponding component.
Furthermore, instead of having a single annular and funnel-shaped
centering surface 159, centering aid 153 may also have a plurality
of conical arc portions, etc.
[0078] In addition, fastening element 151 has at least one and by
way of example three optional angle setting members 157. These are
used, for example in the case of a tool attachment constructed in
the manner of an angle attachment or eccentric attachment being
fastened to machine interface 150, to specify a predetermined
angular position.
[0079] FIG. 2 shows an example of a tool attachment 200 which may
be fastened to machine interface 150 of hand-held machine tool 100
of FIG. 1 in a rotationally secured manner. Tool attachment 200 is
constructed, according to one exemplary embodiment, in the manner
of a drill chuck attachment and has by way of example a locking
unit 202 and a clamping chuck unit 204. It is pointed out, however,
that tool attachment 200 is constructed as a drill chuck attachment
only by way of example and not as a limitation of the present
invention. Rather, tool attachment 200 may be of any desired
configuration, for example in the manner of an angle attachment, an
eccentric attachment etc.
[0080] Clamping chuck unit 204 has by way of example a supporting
body 294 on which there is supported a plurality of clamping jaws
290 which are operable by a clamping body 292 provided with a
clamping sleeve 280 to clamp therein an associated inserted tool,
for example a round drill. Supporting body 294 is fastened in a
rotationally secured manner, for example by a screwed connection
275, to a first axial end 274 of an actuating member 270 associated
with locking unit 202, so that, upon rotational movement of
actuating member 270, supporting body 294 rotates therewith.
Alternatively, supporting body 294 may, for example, also be
connected to actuating member 270 by way of a press-fit connection
or may also be constructed in one piece therewith. By way of
illustration, in at least partly sleeve-shaped actuating member
270, a drive shaft 268 is received in a rotationally secured
manner, for example by a press-fit connection 266, so that, upon
rotation of drive shaft 268, actuating member 270 rotates
therewith. Alternatively, drive shaft 268 and actuating member 270
may also be constructed in one piece.
[0081] At a free axial end of drive shaft 268, which by way of
example is received in a second axial end region of actuating
member 270, a polygonal driving contour 265 is provided. An outer
periphery of the second axial end region of actuating member 270 is
rotatably supported in, and preferably press-fitted in, a bearing
element 212 associated with locking unit 202, for example a rolling
bearing constructed in the manner of a radial bearing, so that
clamping chuck unit 204 is rotatably supported at locking unit 202.
Bearing element 212 is in this case axially fixed in position in
the axial direction of actuating member 270 between an annular
shoulder 226 formed thereon and a securing ring 227 fastened
thereto. It is pointed out, however, that a suitable practical
realization of clamping chuck unit 204 is sufficiently known from
the related art and therefore a detailed description of clamping
chuck unit 204 may be dispensed with here for conciseness.
[0082] According to one exemplary embodiment, locking unit 202 is
configured at least for rotationally secured fastening to machine
interface 150 of hand-held machine tool 100 of FIG. 1 and, in an
unlocked state, makes it possible for tool attachment 200 to be
placed on machine interface 150 and, in a locked state, makes it
possible for tool attachment 200 to be locked to machine interface
150 for operation. For that purpose, locking unit 202 preferably
has a rotatable locking body 300 which in the unlocked state is
disposed in a first rotational position and in the locked state is
disposed in a second rotational position on machine interface 150
of hand-held machine tool 100 of FIG. 1, as described hereinafter
in the case of FIGS. 10 and 11. That locking body 300 preferably
has at its inner periphery at least two retaining members 298, 299
which are configured, for example, in the manner of bayonets to
form a bayonet connection with bayonets 152, 154 of machine
interface 150 of FIG. 1.
[0083] According to one exemplary embodiment, locking body 300 is
at least partly tubular and forms an interior space 216 and also an
outer periphery 245 on which an external collar 215 is provided.
External collar 215 is provided at an axial end (399 in FIG. 3) of
locking body 300, which axial end is remote from clamping jaw unit
204, locking body 300 having at its opposite axial end (398 in FIG.
3) an internal annular groove 297 with an internal securing ring
228 being fastened in annular groove 297. In addition, by way of
illustration, locking body 300 has an internal annular shoulder
223, a centering member 260 being by way of example axially fixed
in position in the region between annular shoulder 223 and securing
ring 228. Between that centering member 260 and annular shoulder
223, an elastic element 240 is preferably disposed, for example an
O-ring of rubber material, a cup spring, a corrugated washer, a
cylindrical compression spring etc. By way of example, bearing
element 212 is disposed at inner periphery 273 of centering member
260 and is preferably press-fitted therein.
[0084] Preferably, a preferably sleeve-shaped actuating element 600
provided with an external grip surface 249 and having an internal
projection 241, which by way of illustration is annular, is
disposed and rotatably supported on outer periphery 245 of locking
member 300. Actuating element 600 is configured to make it possible
for locking body 300 to be rotated from the first into the second
rotational position.
[0085] In the region between locking body 300 and actuating element
600, according to one exemplary embodiment a locking member 400
that is resilient at least in regions and a blocking member 500 are
disposed. Locking member 400 is fixed in position on locking body
300 at least by a portion, and blocking member 500 on actuating
element 600. According to one exemplary embodiment, locking member
400 is configured to prevent rotation of locking body 300 from its
second rotational position into its first rotational position in
the locked state of locking unit 202, locking member 400 preferably
cooperating with locking element 155 of FIG. 1 associated with
machine interface 150 of hand-held machine tool 100 of FIG. 1. In
this case, actuating element 600 is preferably configured to urge
locking member 400 in the locked state of locking unit 202 at least
in portions toward machine interface 150 of hand-held machine tool
100, as described below in the case of FIG. 11. Blocking member 500
is configured according to one exemplary embodiment to block
actuating element 600, in the locked state of locking unit 202, in
a blocking position at locking body 300, in which position
actuating element 600 urges locking member 400 at least in portions
toward machine interface 150 of hand-held machine tool 100 of FIG.
1 to prevent automatic rotation of actuating element 600 relative
to locking body 300.
[0086] It is pointed out, however, that locking member 400
described above and blocking member 500, which is separate
therefrom, are merely of an illustrative nature and do not serve to
limit the present invention. Rather, locking member and blocking
member may also be constructed in one piece and, for example, may
together be held on the locking body, as will be described by way
of example below in the case of FIG. 12. Furthermore, it is also
pointed out that the described tubular or sleeve-shaped
configurations of locking body 300 and of actuating element 600 are
likewise merely of an illustrative nature and are not to be
construed as a limitation of the present invention. Rather, locking
body 300 and the actuating element may, for example, each be formed
from two or more arcuate elements, etc.
[0087] Centering member 260 and machine interface 150 of hand-held
machine tool 100 of FIG. 1 preferably form complementary geometric
shapes which make possible an axial centering of locking unit 202
at machine interface 150 of FIG. 1 and for that purpose they
preferably engage with each other. Those complementary geometric
shapes are configured to form a positive connection in the axial
direction of locking unit 202. For that reason, complementary
geometric shapes are to be understood within the context of the
present invention as being quite generally geometric shapes that
are capable of being joined together to form a positive
connection.
[0088] By way of illustration, centering member 260 of locking unit
202 has at least one at least partly conical centering aid 220.
Centering aid 220 is provided for engagement in at least partly
funnel-shaped centering aid 153 provided at machine interface 150
of hand-held machine tool 100 of FIG. 1, and is preferably
configured at least partly in the manner of a ring 221 having an
outer periphery 225 that is chamfered at least in regions, at an
axial end region 262 of locking unit 202. Alternatively, instead of
having ring 221, centering aid 220 may have, for example, a
plurality of conical arc portions, etc.
[0089] For mounting of tool attachment 200 on machine interface 150
of hand-held machine tool 100 of FIG. 1, tool attachment 200 is
brought in direction 198 of FIG. 1 toward machine interface 150 and
is positioned thereon such that actuating member 270 is brought
into contact with locking sleeve 149 of tool holder 140 of
hand-held machine tool 100, so that the free end of drive shaft 268
at least partly engages the empty internal polygonal receptacle 148
of tool holder 140. Then, tool attachment 200 is moved toward
machine interface 150 in direction 198, in which operation
actuating member 270 also moves locking sleeve 149 in direction 198
and thus unlocks tool holder 140 so that the free end of drive
shaft 268 is pushed into internal polygonal receptacle 148. In that
operation, tool attachment 200 is pushed onto machine interface 150
such that locking body 300 rests against, or rather engages around,
fastening element 151 of machine interface 150 of FIG. 1 so that,
by actuation of actuating element 600, locking unit 202 may be
locked to machine interface 150 of FIG. 1. In that operation, at
least partly conical centering aid 220 of locking unit 202 is
brought into contact with at least partly funnel-shaped centering
aid 153 of machine interface 150 of FIG. 1. To take tool attachment
200 off hand-held machine tool 100 of FIG. 1, it is removed from
machine interface 150 of FIG. 1 in direction 199 of FIG. 1 after
locking unit 202 has been unlocked.
[0090] It is, however, once again pointed out that centering aids
220 and 153 of FIG. 1 are of a conical configuration merely by way
of example and not as a limitation of the present invention.
Rather, as described above, they merely have to have complementary
geometric shapes suitable for forming a positive connection.
Accordingly, centering aid 153 of machine interface 150 may, for
example, as shown in FIG. 1, be funnel-shaped while centering aid
220 of tool attachment 200 is, for example, cylindrical or annular.
Alternatively, it is possible, for example, for centering aid 220
of tool attachment 200 to be of a conical, that is, cone-shaped or
funnel-shaped, configuration as described above, while centering
aid 153 of machine interface 150 of FIG. 1 is cylindrical or
annular, and so on.
[0091] FIG. 3 shows tubular locking body 300 of FIG. 2 which at an
axial end 399 has on its outer periphery 245 external collar 215
and on its inner periphery retaining member 298 constructed in the
manner of a bayonet. At its opposite axial end 398, internal
annular groove 297 and internal annular shoulder 223 are provided.
In addition, at axial end 398, by way of example three openings 340
for receiving associated retaining members of centering member 260
of FIG. 2 are provided which, for example, are oriented radially
outwardly from centering member 260 in the manner of
projections.
[0092] According to one exemplary embodiment, at least one driven
member 330 is provided on locking body 300, by way of illustration
at outer periphery 245 thereof. Driven member 330 is by way of
example of a ridge-like configuration and, beginning at external
collar 215, is oriented, for example, parallel to the axis of
rotation of locking body 300 in the direction of axial end 398, as
indicated by arrow 199 of FIG. 2. In addition, by way of
illustration a fixing member 320 is provided on external collar
215. Furthermore, an engagement aperture 310 is provided in the
region of external collar 215.
[0093] FIG. 4 shows locking body 300 of FIG. 3 rotated about its
axis of rotation by about 180.degree.. In contrast to FIG. 3, as a
result of the rotation, retaining member 299 configured in the
manner of a bayonet at axial end 399 is visible here.
[0094] According to one exemplary embodiment, locking member 400 of
FIG. 2 is fastened to outer periphery 245 of locking body 300. For
that purpose, locking member 400 has a fastening portion 410 which
by way of example is fastened in a groove-like opening 415 of
external collar 215 of locking body 300. Beginning at that
fastening portion 410, locking member 400 is by way of illustration
U-shaped with a locking spring arm 417 extending, at least in
regions, parallel to external collar 215 and with a supporting arm
419 extending, for example, parallel to arm 417. Locking spring arm
417 engages by its free end through engagement aperture 310 of
locking body 300. Supporting arm 419 preferably rests completely
against outer periphery 245 of locking body 300.
[0095] FIG. 5 shows locking body 300 of FIG. 4 mirrored in the
direction of arrow 199 of FIGS. 3 and 4 to illustrate the free end,
engaging through engagement aperture 310 thereof, of locking spring
arm 417 of locking member 400 of FIG. 4, which locking member 400
according to one exemplary embodiment forms a locking portion 420.
In addition, FIG. 5 shows blocking member 500 of FIG. 2 which is
disposed by way of illustration on outer periphery 245 of locking
body 300 and which, as described in the case of FIG. 2 and as shown
in FIG. 6, is fastened to actuating element 600 of FIG. 2 and has
by way of example the shape of a curly brace.
[0096] Blocking member 500 is preferably configured to be resilient
at least in regions and has a blocking portion 520 which may be
releasably fixed to fixing member 320 provided on external collar
215 of locking body 300. In this case, fixing member 320 has at
least one snap-in groove configured in the manner of a recess into
which blocking portion 520, which by way of illustration is
configured in the manner of a resilient snap-in projection, may be
snapped.
[0097] FIG. 6 shows sleeve-shaped actuating element 600 of FIG. 2
with locking member 400 of FIGS. 4 and 5 disposed on its inner
periphery to illustrate fastening portion 410 of FIG. 4 and locking
portion 420 of FIG. 5. Actuating element 600 may have at its outer
periphery 249 a grip surface that is rubberized at least in regions
and which enables actuating element 600 to be actuated comfortably
and safely.
[0098] According to one exemplary embodiment, at least one driver
element 630 is provided on the inner periphery of actuating element
600. Driver element 630 is by way of example of a ridge-like
configuration and, beginning at internal projection 241, is
oriented, for example, parallel to the axis of rotation of
actuating element 600 in the direction of the axial end of
actuating element 600 remote from projection 241, that is to say,
in FIG. 2 in the direction of arrow 198. In addition, in the region
of internal projection 241, a fastening member 620 is disposed for
fastening of blocking member 500 of FIGS. 2 and 5. By way of
illustration, fastening member 620 has two openings in which the
free ends of blocking member 500, which is configured in the manner
of a curly brace, are disposed. The free ends may be permanently
fastened in the two openings in any desired manner.
[0099] FIG. 7 shows actuating element 600 of FIG. 6 tilted about
its axis of rotation, with locking member 400 of FIG. 4 disposed on
its inner periphery and with a control curve 650, constructed on
the inner periphery according to one exemplary embodiment, for
actuating locking member 400 or rather locking spring arm 417
thereof. Control curve 650 is preferably configured to make it
possible for locking member 400 to be urged at least in portions
toward machine interface 150 of hand-held machine tool 100 of FIG.
1 in the locked state of locking unit 202 of FIG. 2.
[0100] FIG. 8 shows actuating element 600 of FIG. 6 rotated about
its axis of rotation by about 160.degree., without locking member
400 of FIGS. 4 and 5, to illustrate control curve 650 of FIG. 7.
According to one exemplary embodiment, control curve 650 has a
release portion 652, in which locking spring arm 417 of locking
member 400 is able to spring radially outward in a release
position, and an urging portion 656, configured by way of
illustration in the manner of a radially inwardly oriented
projection, with which locking spring arm 417 may be urged radially
inward in a locking position. Between release portion 652 and
urging portion 656, a sloped transfer portion 654 is preferably
provided over which it is possible for locking spring arm 417 to be
transferred from its release position to its locking position and
vice versa.
[0101] FIG. 9 shows an assembly 900 having locking body 300 of
FIGS. 3 through 5 and actuating element 600 of FIGS. 6 through 8
rotatably supported on its outer periphery 245, and locking and
blocking members 400 and 500, respectively, of FIGS. 4 through 6
disposed therebetween. Locking body 300 and actuating element 600
are shown by way of example in the unlocked state of locking unit
202 of FIG. 2, in which blocking portion 520 of blocking member 500
is engaged in an unlocking position in a first recess 922 of fixing
member 320 and locking spring arm 417 of locking member 400 springs
radially outward in its release position toward release portion 652
of control curve 650.
[0102] According to one exemplary embodiment, locking body 300 may
be rotated by rotation of actuating element 600 in the direction of
an arrow 999--clockwise in FIG. 9--in order to transfer locking
unit 202 of FIG. 2 from the unlocked to the locked state. In this
case, driven members 330 of locking body 300 are preferably
configured to make possible a rotational movement of actuating
element 600 relative to locking body 300 at least by a
predetermined rotation angle 910 to enable blocking member 500 to
be transferred from the unlocked position to the blocking position,
in which its blocking portion 520 snaps into a second recess 924 of
fixing member 320, and to enable locking member 400 to be
transferred from its release position to its locking position.
[0103] After such a relative rotation by rotation angle 910, viewed
in the direction of arrow 999 driver elements 630 rest against
driven members 330. For example, after the relative rotation by
rotation angle 910, a driver element 932 rests against a driven
member 934. Upon rotation in the direction of arrow 999 beyond
rotation angle 910, driver elements 630 of actuating element 600
and driven members 330 of locking body 300, which viewed in the
direction of arrow 999 now rest against each other, are preferably
configured to cooperate for rotary entrainment of locking body 300
in order to rotate locking body 300 from its first rotational
position to its second rotational position.
[0104] FIG. 10 shows a tool system 1000 with hand-held machine tool
100 of FIG. 1 and tool attachment 200 of FIG. 2, of which only
machine interface 150 of FIG. 1 and assembly 900 of FIG. 9 are
shown in order to simplify the drawing. For releasable fastening or
locking of tool attachment 200, assembly 900 is disposed on machine
interface 150 such that bayonets 298, 299 and 152, 154 of locking
body 300 and machine interface 150 may be locked to each other by
rotation of actuating element 600 in direction 999 of FIG. 9, and
hence of locking body 300 from its illustrated, first rotational
position to its second rotational position illustrated in FIG.
11.
[0105] When such a rotation is performed by a user of tool system
1000, bayonets 298, 299 and 152, 154 are first brought into
engagement with one another such that, owing to elastic element 240
of FIG. 2, a resilient force is built up between bayonets 298 and
152 and, respectively, 299 and 154, which force is greater than the
spring forces of blocking portion 520 of blocking member 500, which
blocking portion 520 is to be transferred between recesses 922 and
924, and of locking spring arm 417 of locking member 400, which arm
417 is to be guided along sloped transfer portion 654 of control
curve 650. Accordingly, upon further rotation of actuating element
600 in direction 999, first the relative rotation described in the
case of FIG. 9 between actuating element 600 and locking body 300
by rotation angle 910 takes place, in which rotation a rotation of
locking body 300 is prevented by the resilient force that has built
up. After completion of the relative rotation by rotation angle
910, locking portion 420 of locking member 400 engages set of
locking teeth 156 of locking element 155 and the resilient force
which has built up may be overcome by a rotational force applied by
the user in order to close the bayonet connection completely.
[0106] Since, therefore, locking portion 420 of locking member 400
already engages set of locking teeth 156 of locking element 155
upon tightening and at least upon complete closing of the bayonet
connection, a chattering or clattering noise is produced which
provides the user with auditory feedback. That noise preferably
does not occur upon undoing the bayonet connection since in that
case, owing to the resilient force which has built up, the
connection forces are preferably greater than the above-described
spring forces, with the result that the engagement of locking
portion 420 by set of locking teeth 156 is released before bayonet
connection is undone.
[0107] FIG. 11 shows tool system 1000 of FIG. 10 in the locked
state of locking unit 202 of FIG. 2 after rotation of actuating
element 600 in the direction of arrow 999 and hence of locking body
300 into its second rotational position. FIG. 11 makes clear the
arrangement of blocking portion 520 of blocking member 500, which
blocking portion 520 is disposed in the blocking position in recess
924 of fixing member 320, and also illustrates locking member 400
urged by elastic deformation toward machine interface 150 of
hand-held machine tool 100 and whose locking portion 420 engages
set of locking teeth 156 in order to prevent locking body 300 from
automatically turning from its second rotational position into the
first rotational position of FIGS. 9 and 10. In addition, FIG. 11
illustrates locking spring arm 417 which is urged radially inward
by urging portion 656 of control curve 650.
[0108] FIG. 12 shows a tool system 1200 with hand-held machine tool
100 of FIG. 1, of which only machine interface 150 is shown to
simplify the drawing, and tool attachment 200 of FIG. 2 which has a
locking body 300', an actuating element 600' and a locking and
blocking member 400' that are configured in accordance with an
alternative exemplary embodiment. Elements in the two exemplary
embodiments that are functionally identical but which structurally
may have been slightly modified have identical reference
numerals.
[0109] In contrast to locking member 400 of FIG. 4 and blocking
member 500 of FIG. 5, locking and blocking member 400' is in one
piece with a locking portion 420' and is disposed on the inner
periphery of locking body 300'. Such a one-piece configuration of
locking and blocking member 400' requires a few structural
alterations to locking body 300' and actuating element 600' in
contrast to locking body 300 of FIGS. 3 through 5 and actuating
element 600 of FIGS. 5 through 8. For example, illustrative locking
and blocking member 400' merely has a locking member portion 417'
and a blocking member portion 520' which assume the functionality
of locking spring arm 417 and blocking portion 520, respectively,
of FIGS. 4 and 5. Those portions 417', 520' engage through
respective engagement apertures 310' and 310'' provided at locking
body 300' and are spring-loaded toward an inner periphery of
actuating element 600' on which by way of illustration a control
curve 650' and a fixing member 320' are provided.
[0110] FIG. 13 shows an example of a tool attachment 700 according
to an alternative exemplary embodiment which is preferably likewise
configured for fastening to machine interface 150 of hand-held
machine tool 100 of FIG. 1. Tool attachment 700 is configured in
the manner of an angle attachment and by way of example has a
fastening interface 702, hereinafter referred to as an "attachment
interface" for clarity of the description, and a drive unit 704
which is also referred to hereinafter as an "angle drive portion".
It is pointed out, however, that tool attachment 700 is constructed
as an angle attachment merely by way of example and not as a
limitation of the present invention. Rather, tool attachment 700
may have any desired configuration, for example in the manner of an
eccentric attachment, a drill chuck attachment, etc. For simplicity
of the description, tool attachment 700 is also referred to
hereinafter as "angle attachment 700".
[0111] Angle drive portion 704 has by way of example an attachment
housing 710 in which a drive shaft 798 which is drivable in
rotation is rotatably supported in two bearing elements 777, 779.
Drive shaft 798 serves to drive a drive shaft 705 which is disposed
at a predetermined angle thereto, by way of illustration
90.degree., and which is likewise rotatably supported in attachment
housing 710, for example in two bearing elements 787, 789, and
which may, for example, be configured to receive screwdriver bit
170 of FIG. 1. In this case, drive shaft 798 drives drive shaft
705, for example, via a suitable conversion 720. It is pointed out,
however, that a suitable practical realization of angle drive
portion 704 is sufficiently known from the related art and
therefore a detailed description of angle drive portion 704 may be
dispensed with here for conciseness.
[0112] Disposed in the region of a free end 769, remote from angle
drive portion 704, of drive shaft 798, on which end a polygonal
driving contour 765 is provided by way of example, there is an
angle setting element 772 which is of a sleeve-shaped or tubular
configuration at least in regions, through which drive shaft 798
extends. That angle setting element 772 is preferably rigidly
connected to attachment housing 710, that is, so as to be axially
and radially immovable, and/or is constructed in one piece with
attachment housing 710. By way of illustration, angle setting
element 772 has at the axial end thereof toward angle drive portion
704 an external ring collar 752 which is disposed in an axially and
radially immovable manner between two, for example annular,
projections 757, 759 of attachment housing 710, for example by
being press-fitted or clamped. At its other axial end 771, a
front-face set of angle setting teeth 774 is provided.
[0113] In addition, drive shaft 798 is assigned an actuating member
797 which is provided with a free end 788 and the functionality of
which corresponds to the functionality of actuating member 270 of
FIG. 2, and therefore a detailed description thereof will be
dispensed with here for conciseness description. Alternatively,
drive shaft 798 and actuating member 797 may also be constructed in
one piece. Actuating member 797 is by way of example disposed in
the interior of angle setting element 772 and is preferably
radially spaced therefrom.
[0114] According to one exemplary embodiment, drive shaft 798 is
rotatable relative to actuating member 797. In this case, drive
shaft 798 may, for example, be rotatably supported in a plain
bearing, for example a sintered bearing, press-fitted in actuating
member 797.
[0115] Fastening interface 702 serves to fasten tool attachment 700
to an associated hand-held machine tool, for example hand-held
machine tool 100 of FIG. 1, and has by way of illustration an
angular position setting unit 770, which may likewise be used in
the case of tool attachment 200 of FIG. 2 and with which angle
setting element 772 is associated, and a locking unit 760. Locking
unit 760 is configured to lock tool attachment 700 for operation to
the hand-held machine tool in a predetermined angular position
thereon in the locked state and to enable tool attachment 700 to be
pulled off the hand-held machine tool in an unlocked state. Angular
position setting unit 770 is configured to enable the predetermined
angular position of tool attachment 700 to be set for operation on
the hand-held machine tool. According to one exemplary embodiment,
angular position setting unit 770 is operable in the locked state
of locking unit 760 to make it possible for the predetermined
angular position to be altered. Such operation to alter the
predetermined angular position is preferably effected by a combined
longitudinal and rotational movement of attachment housing 710.
[0116] According to one exemplary embodiment, locking unit 760 has
a locking body 762, especially a locking body of an at least partly
tubular configuration or a locking body provided with a tubular
receiving portion 761. In tubular receiving portion 761 and hence
in locking unit 760, angle setting element is supported to be
movable longitudinally and in rotation. At an axial end of locking
body 762 remote from angle drive portion 704, locking body 762
continues via an annular shoulder 781 from tubular receiving
portion 761 on the one hand into a widened region 783 and on the
other hand into a centering member 731 which has, for example, at
least two arcuate centering regions 776, 778 which are sloped in
the longitudinal direction of tool attachment 700, that is, in
direction 198 of FIG. 1. It is pointed out, however, that centering
member 731 has the at least two arcuate, sloped centering regions
776, 778 merely by way of example and not as a limitation of the
present invention. Rather, centering member 731 may also have a
single centering region configured in the manner of a conical
frustum.
[0117] In widened region 783, at least two locking elements 766
(and 768 in FIG. 14) are preferably provided which by way of
example are configured in the manner of bayonets to form a bayonet
connection. Furthermore, there is disposed on the outer periphery
of that widened region 783 by way of example an actuating ring 764
which is operable to lock locking body 762 to the hand-held machine
tool, it being possible for locking body 762 and actuating ring 764
to be constructed in one piece. On outer periphery of tubular
receiving portion 761, by way of illustration a return sleeve 750
is supported to be movable axially and radially. The latter is
supported on annular shoulder 781 by an annular collar 714 provided
at an axial end of return sleeve 750 toward annular shoulder 781 of
tubular receiving portion 761, and at its other axial end is
engaged by an annular groove 717 provided in attachment housing
710. Alternatively, return sleeve 750 may be integrally formed on
attachment housing 710 and/or may be constructed in one piece
therewith.
[0118] In addition, provided between annular collar 714 and a
securing ring 719 disposed in an outer annular groove 718 of
tubular receiving portion 761 is a spring element 780, for example
a compression spring, which biases return sleeve 750 with a
predetermined spring force in the direction of annular shoulder
781, that is, in direction 198 of FIG. 1. Annular groove 718 is
constructed by way of example in the region of an axial end 732 of
tubular receiving portion 761 toward angle drive portion 704.
[0119] FIG. 14 shows an example of a tool system 800 which by way
of illustration has hand-held machine tool 100 of FIG. 1 and angle
attachment 700 of FIG. 13 to illustrate an example of the mounting
of angle attachment 700 on hand-held machine tool 100. Only a
portion of the latter is shown, by a detail of housing 110 of FIG.
1 at whose front face 112 machine interface 150 of FIG. 1 is
disposed and in which drive shaft 124 is rotatably supported in an
illustrative rolling bearing 824, tool holder 140 of FIG. 1 being
disposed on drive shaft 124. As described in the case of FIG. 1,
according to one exemplary embodiment machine interface 150 is
disposed on gear unit housing 119. By way of illustration,
fastening element 151 is in this case fastened to gear unit housing
119 by suitable fastening members, for example screws or
rivets.
[0120] To mount angle attachment 700 on machine interface 150 of
hand-held machine tool 100, angle attachment 700 is brought toward
machine interface 150 of FIG. 1 in direction 198 of FIG. 1 and is
positioned thereon in a predetermined angular position such that
widened portion 783 of tubular receiving portion 761 is disposed in
the region of fastening element 151 of machine interface 150. In
that operation, actuating member 797 of angle attachment 700 is
brought by its free end 788 into contact with locking sleeve 149 of
tool holder 140 of hand-held machine tool 100, so that free end 769
of drive shaft 798 engages partly in empty internal polygonal
receptacle 148 of tool holder 140 and is prevented from engaging
completely by locking balls 729 associated by way of example with
tool holder 140. Those locking balls 729, or other suitable locking
elements, are urged radially inward in a manner known to one
skilled in the art, for example, by locking sleeve 149 of tool
holder 140 in order in that manner to prevent unimpeded insertion
of drive shaft 768 into internal polygonal receptacle 148, locking
sleeve 149 being spring-loaded by a spring element 897 in axial
direction 199 of FIG. 1 pointing away from hand-held machine tool
100.
[0121] In a further step, angle attachment 700 is pushed onto
machine interface 150 in the direction of hand-held machine tool
100, that is, in direction 198, for example until widened region
783 of tubular receiving portion 761 rests against fastening
element 151 of machine interface 150 so that, by rotation of
actuating ring 764 of locking unit 760 of tool attachment 700,
bayonets 766, 768 thereof may be brought into engagement with
bayonets 152, 154 of fastening element 151 and thus may be locked
thereto, so that locking unit 760 is transferred from its unlocked
state to the locked state. In that locked state, attachment housing
710 of angle attachment 700 is urged in direction 198 of hand-held
machine tool 100 by a predetermined spring force exerted by spring
element 780 of locking unit 760 of tool attachment 700.
[0122] In addition, as a result of tool attachment 700 being pushed
onto machine interface 150, locking sleeve 149 of tool holder 140
is pushed by actuating member 797 of angle attachment 700 in
direction 198 against a spring force exerted by spring element 897,
so that free end 769 of drive shaft 798 may be pushed into internal
polygonal receptacle 148. That makes one-handed mounting of tool
attachment 700 on hand-held machine tool 100 possible, drive shaft
798 having clearance tangentially and axially and preferably being
received in internal polygonal receptacle 148 of receiving body 147
of tool holder 140 exclusively for transmitting torque.
[0123] In addition, sloped centering regions 776, 778 of tubular
receiving portion 761 of tool attachment 700 are brought into
contact with centering aid 153 of fastening element 151, which
centering aid 153 is configured in the manner of an annular cone
surface 159. A secure and reliable axial centering of tool
attachment 700 at tool holder 140 or rather relative to drive
spindle 124 of hand-held machine tool 100 may thus be made
possible. In addition, set of angle setting teeth 774 of angle
setting element 772 of tool attachment 700 is brought into
engagement with angle setting members 157 of fastening element 151.
In that manner, the predetermined angular position for operation of
tool attachment 700 on hand-held machine tool 100 is
established.
[0124] Actuating ring 764 of angle attachment 700 and hence entire
angle attachment 700 is then released, whereupon actuating member
797 is urged, owing to the spring force of spring element 897, by
locking sleeve 149 of tool holder 140 in direction 199, so that
entire angle attachment 700 is forced to move axially in direction
199. In that manner, the bayonet connection between bayonets 766,
768 of tool attachment 700 and bayonets 152, 154 of fastening
element 151 is additionally secured.
* * * * *