U.S. patent application number 13/936901 was filed with the patent office on 2014-01-09 for impact driver having an impact mechanism.
This patent application is currently assigned to Robert Bosch GmbH. The applicant listed for this patent is Siew Yuen Lee, Sim Teik YEOH. Invention is credited to Siew Yuen Lee, Sim Teik YEOH.
Application Number | 20140008089 13/936901 |
Document ID | / |
Family ID | 49780732 |
Filed Date | 2014-01-09 |
United States Patent
Application |
20140008089 |
Kind Code |
A1 |
YEOH; Sim Teik ; et
al. |
January 9, 2014 |
Impact driver having an impact mechanism
Abstract
In an impact driver including an impact mechanism for percussive
driving of an output drive shaft on which is provided a tool
receptacle for receiving an inserted tool, the tool receptacle is
embodied as a clamping chuck, a permanent connection being embodied
between the clamping chuck and the output drive shaft in order to
prevent at least tool-free detachment of the clamping chuck from
the output drive shaft.
Inventors: |
YEOH; Sim Teik; (Gelugor
Penang, MY) ; Lee; Siew Yuen; (Pulau Pinang,
MY) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
YEOH; Sim Teik
Lee; Siew Yuen |
Gelugor Penang
Pulau Pinang |
|
MY
MY |
|
|
Assignee: |
Robert Bosch GmbH
Stuttgart
DE
|
Family ID: |
49780732 |
Appl. No.: |
13/936901 |
Filed: |
July 8, 2013 |
Current U.S.
Class: |
173/90 |
Current CPC
Class: |
B23B 31/1246 20130101;
B25B 21/02 20130101 |
Class at
Publication: |
173/90 |
International
Class: |
B25B 21/02 20060101
B25B021/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 9, 2012 |
DE |
102012211907.8 |
Claims
1. An impact driver, comprising: an impact mechanism for percussive
driving of an output drive shaft on which is provided a tool
receptacle for receiving an inserted tool; wherein the tool
receptacle is a clamping chuck, a permanent connection being
embodied between the clamping chuck and the output drive shaft to
prevent at least tool-free detachment of the clamping chuck from
the output drive shaft.
2. The impact driver of claim 1, wherein the impact mechanism
includes a mechanical impact mechanism having a spring-loaded
impact member having at least one input drive cam, the output drive
shaft having at least one output drive cam.
3. The impact driver of claim 1, wherein the output drive shaft has
at least one axial internal recess having an internal thread, and
wherein an external thread is embodied on the external periphery of
the output drive shaft, the internal thread and the external thread
having counterdirectional screw threads.
4. The impact driver of claim 3, wherein the clamping chuck has a
clamping chuck body equipped with an axial passthrough opening and
an internal thread, the internal thread being embodied for
thread-joining to the external thread of the output drive shaft and
the axial passthrough opening being equipped for passage of a screw
equipped with an external thread, and the external thread of the
screw being embodied for thread-joining to the internal thread of
the output drive shaft.
5. The impact driver of claim 2, wherein the output drive shaft is
embodied in at least two pieces and has an output drive stud and a
cam member having at least one output drive cam, the output drive
stud being fastened via a rigid connection on the clamping chuck
and being connected nonrotatably to the cam member.
6. The impact driver of claim 5, wherein the output drive stud has,
at its axial end connected to the cam member, a rotationally
entrained member that engages in a rotationally secured manner into
a rotationally entraining member correspondingly embodied on the
cam member.
7. The impact driver of claim 6, wherein the rotationally entrained
member is embodied in the manner of a polygonal contour on the
external periphery of the output drive stud, and the rotationally
entraining member is provided in the manner of a polygonal opening
on the cam member.
8. The impact driver of claim 5, wherein the cam member is fastened
on the output drive stud via a securing member.
9. The impact driver of claim 8, wherein the securing member is
disposed on a side of the cam member facing toward the impact
member.
10. The impact driver of claim 8, wherein the securing member is
disposed on a side of the cam member facing away from the impact
member.
11. The impact driver of claim 9, wherein the securing member is
embodied in the manner of a securing ring that is disposed in an
annular groove provided on the output drive stud.
12. The impact driver of claim 1, wherein the output drive shaft
embodies a rotationally entraining member and has at least one
radial passthrough opening.
13. The impact driver of claim 12, wherein the clamping chuck has a
clamping chuck body on which is provided a radial opening oriented
in alignment with the radial passthrough opening of the output
drive shaft, and which embodies a rotationally entrained member
into which the rotationally entraining member embodied on the
output drive shaft engages in rotationally secured fashion.
14. The impact driver of claim 13, wherein for rotationally secured
fastening of the clamping chuck body on the output drive shaft, an
at least locally peg-shaped securing member is disposed in the
radial passthrough opening of the output drive shaft and at least
locally in the radial opening of the clamping chuck body.
15. The impact driver of claim 14, wherein an O-shaped securing
ring is disposed in the region of the peg-shaped securing member on
the clamping chuck body to immobilize the peg-shaped securing
member in the radial opening of the clamping chuck body and in the
radial passthrough opening of the output drive shaft.
Description
RELATED APPLICATION INFORMATION
[0001] The present application claims priority to and the benefit
of German patent application no. 10 2012 211 907.8, which was filed
in Germany on Jul. 9, 2012, the disclosure of which is incorporated
herein by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to an impact driver having an
impact mechanism for percussive driving of an output drive shaft on
which is provided a tool receptacle for receiving an inserted
tool.
BACKGROUND INFORMATION
[0003] German patent document DE 20 2006 014 850 U1 discusses an
impact driver of this kind that has a tool receptacle, equipped
with a polygonal internal receptacle, that is provided on an output
drive shaft percussively drivable by an associated impact
mechanism. The polygonal internal receptacle is connectable to an
inserted tool of the so-called hex type, e.g. a screwdriver bit,
that has an external polygonal coupling that corresponds to the
polygonal internal receptacle, has a hexagonal cross section, and
is equipped e.g. with an external annular groove embodied in
accordance with DIN 3126-E6.3.
[0004] The existing art is disadvantageous in that such impact
drivers are limited to the use of inserted tools of the hex type.
For the case in which a user wishes to use inserted tools that are
embodied in accordance with other inserted tool types, for example
inserted tools of the so-called SDS type or round shank type, he or
she must then possess a respective separate hand-held power tool
suitable therefor, and must use it as necessary instead of the
impact driver. This on the one hand necessitates corresponding
procurement costs on the part of the user, and on the other hand
can result in loss of utilization convenience during operation of
an impact driver of this kind, as a result of the exchange of tools
required in each case.
SUMMARY OF THE INVENTION
[0005] An object of the present invention is thus to make available
a novel impact driver that is usable with a plurality of inserted
tools embodied in accordance with different inserted-tool
types.
[0006] This problem is solved by an impact driver having an impact
mechanism for percussive driving of an output drive shaft on which
is provided a tool receptacle for receiving an inserted tool. The
tool receptacle is embodied as a clamping chuck, a permanent
connection being embodied between the clamping chuck and the output
drive shaft in order to prevent at least tool-free detachment of
the clamping chuck from the output drive shaft.
[0007] The present invention thereby makes it possible to provide
an impact driver in which, thanks to the use of a tool receptacle
embodied in the manner of a clamping chuck, utilization of a
plurality of inserted tools embodied in accordance with different
inserted tool types is enabled, for example inserted tools of the
hex, SDS, and/or round shank type, etc.
[0008] The impact mechanism may be embodied in the manner of a
mechanical impact mechanism having a spring-loaded impact member
that is equipped with at least one input drive cam, the output
drive shaft having at least one output drive cam.
[0009] Provision of an impact driver having a robust and compact
impact mechanism can thereby be enabled.
[0010] According to an embodiment, the output drive shaft has at
least one axial internal recess equipped with an internal
thread.
[0011] The present invention thereby makes it possible to provide a
simple and economical first fastening element on the output drive
shaft for fastening the clamping chuck.
[0012] In addition or alternatively thereto, an external thread can
be embodied on the external periphery of the output drive
shaft.
[0013] The present invention thereby allows a simple and economical
second fastening element to be made available on the output drive
shaft for fastening the clamping chuck.
[0014] The internal thread and the external thread may have
counterdirectional screw threads.
[0015] It is thereby possible to provide on the output drive shaft,
in simple fashion, fastening elements acting in opposite rotation
directions for nonrotatable fastening of the clamping chuck.
[0016] The clamping chuck may have a clamping chuck body equipped
with an axial passthrough opening, the axial passthrough opening
being equipped for passage of a screw equipped with an external
thread and the external thread of the screw being embodied for
thread-joining to the internal thread of the output drive
shaft.
[0017] It thereby becomes possible to make available an impact
driver in which the clamping chuck body is fastened in permanently
secure and stable fashion on the output drive shaft.
[0018] Alternatively or additionally thereto, the clamping chuck
body can have an internal thread, the internal thread being
embodied for thread-joining to the external thread of the output
drive shaft.
[0019] Robust and reliable permanent fastening, acting in opposite
rotation directions, of the clamping chuck on the output drive
shaft is thereby made possible.
[0020] According to an embodiment, the output drive shaft is
embodied in at least two pieces and has an output drive stud as
well as a cam member equipped with at least one output drive cam,
the output drive stud being fastened via a rigid connection on the
clamping chuck and being connected nonrotatably to the cam
member.
[0021] The present invention thereby makes possible the provision
of an impact driver in which simplified installation of the
clamping chuck and improved concentricity properties are made
possible by dividing the output drive shaft in two.
[0022] The output drive stud may have, at its axial end connected
to the cam member, a rotationally entrained member that engages in
rotationally secured fashion into a rotationally entraining member
correspondingly embodied on the cam member.
[0023] A stable and secure connection between the output drive stud
and cam member can thereby be made possible.
[0024] The rotationally entrained member may be embodied in the
manner of a polygonal contour on the external periphery of the
output drive stud, and the rotationally entraining member is
provided in the manner of a polygonal opening on the cam
member.
[0025] The connection between output drive stud and cam member can
thereby be embodied, in uncomplicated and economical fashion, in
the manner of a positive engagement.
[0026] The cam member may be fastened on the output drive stud via
a securing member.
[0027] Undesired detachment of the output drive stud from the cam
member can thereby be securely and reliably prevented.
[0028] According to an embodiment, the securing member is disposed
on a side of the cam member facing toward the impact member.
[0029] The present invention thereby makes it possible to provide
an impact driver in which a comparatively small and economical
securing member is sufficient for rotationally secured fastening of
the output drive stud on the cam member.
[0030] According to an embodiment, the securing member is disposed
on a side of the cam member facing away from the impact member.
[0031] The present invention thereby makes it possible to provide
an impact driver in which a comparatively larger securing member is
used for improved rotationally secured fastening of the output
drive stud on the cam member.
[0032] The securing member may be embodied in the manner of a
securing ring that is disposed in an annular groove provided on the
output drive stud.
[0033] The securing member can thereby be permanently fastened on
the output drive stud in a simple manner.
[0034] According to an embodiment, the output drive shaft embodies
a rotationally entraining member.
[0035] The present invention thereby makes it possible to provide
an impact driver in which rotational entrainment of the clamping
chuck is made possible in simple fashion.
[0036] The clamping chuck may have a clamping chuck body that
embodies a rotationally entrained member, into which the
rotationally entraining member embodied on the output drive shaft
engages in rotationally secured fashion.
[0037] Robust and reliable rotational entrainment of the clamping
chuck can thereby be enabled.
[0038] According to an embodiment, the output drive shaft has at
least one radial passthrough opening.
[0039] The present invention thereby enables the provision of a
simple and economical capability for fastening the clamping chuck
on the output drive shaft.
[0040] A radial opening oriented in alignment with the radial
passthrough opening of the output drive shaft may be provided on
the clamping chuck body.
[0041] Stable, permanent fastening of the clamping chuck body on
the output drive shaft is thereby made possible.
[0042] For rotationally secured fastening of the clamping chuck
body on the output drive shaft, an at least locally peg-shaped
securing member may be disposed in the radial passthrough opening
of the output drive shaft and at least locally in the radial
opening of the clamping chuck body.
[0043] Robust and uncomplicated permanent fastening of the clamping
chuck body on the output drive shaft is thereby achieved.
[0044] An O-shaped securing ring may be disposed in the region of
the peg-shaped securing member on the clamping chuck body in order
to immobilize the peg-shaped securing member in the radial opening
of the clamping chuck body and in the radial passthrough opening of
the output drive shaft.
[0045] It is thereby possible to achieve, in simple fashion, secure
and reliable immobilization of the peg-shaped securing member in
the radial opening of the clamping chuck body and in the radial
passthrough opening of the output drive shaft.
[0046] The present invention is explained in further detail in the
description below with reference to exemplifying embodiments
depicted in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0047] FIG. 1 is a schematic view of an impact driver having an
impact mechanism according to an embodiment.
[0048] FIG. 2 is a sectioned view of a portion of the impact driver
of FIG. 1 having a tool receptacle according to a first
embodiment.
[0049] FIG. 3 is a perspective exploded view of the impact driver
of FIG. 1 equipped with the tool receptacle of FIG. 2.
[0050] FIG. 4 is a sectioned view of the portion of the impact
driver of FIG. 1 having a tool receptacle according to a second
embodiment.
[0051] FIG. 5 is a perspective exploded view of the impact driver
of FIG. 1 equipped with the tool receptacle of FIG. 4.
[0052] FIG. 6 is a sectioned view of the portion of the impact
driver of FIG. 1 having a tool receptacle according to a third
embodiment.
[0053] FIG. 7 is a perspective exploded view of the impact driver
of FIG. 1 equipped with the tool receptacle of FIG. 6.
[0054] FIG. 8 is a sectioned view of the portion of the impact
driver of FIG. 1 having a tool receptacle according to a fourth
embodiment.
[0055] FIG. 9 is a perspective exploded view of the impact driver
of FIG. 1 equipped with the tool receptacle of FIG. 8.
DETAILED DESCRIPTION
[0056] FIG. 1 shows an exemplifying impact driver 100 that is
equipped with a tool receptacle 150 and an impact mechanism 122 and
has a housing 110 having a handle 126. According to an embodiment,
impact driver 100 is mechanically and electrically connectable to a
rechargeable battery pack 130 for cordless power supply.
[0057] Impact driver 100 is embodied by way of example as a
rechargeable battery-operated impact driver. Be it noted, however,
that the present invention is not limited to rechargeable
battery-operated impact drivers, but instead can be applied very
generally to impact drivers regardless of whether they are drivable
electrically, i.e. in cordless fashion with a rechargeable battery
pack or in line-connected fashion, or non-electrically.
[0058] An electric drive motor 114 supplied with power from
rechargeable battery pack 130, a gearbox 118, and impact mechanism
122 are disposed illustratively in tool housing 110. Drive motor
114 can be actuated, for example, via a manual switch 128, i.e.
switched on and off, and can be of any motor type, e.g. an
electronically commutated motor or a DC motor. By preference, drive
motor 114 is electronically controlled or regulated in such a way
that both a reverse mode and also stipulations with regard to a
desired rotation speed can be implemented. The construction and
mode of operation of a suitable drive motor are sufficiently known
from the existing art, and in the interest of a concise and simple
description are therefore not further described here.
[0059] Drive motor 114 is connected via an associated motor shaft
116 to gearbox 118, which converts a rotation of motor shaft 116
into a rotation of a drive member 120, e.g. an input drive shaft,
provided between gearbox 118 and impact mechanism 122.
[0060] This conversion may occur in such a way that input drive
shaft 120 rotates relative to motor shaft 116 with increased torque
but at a decreased rotation speed. Drive motor 114 is disposed
illustratively in a motor housing 115, and gearbox 118 is disposed
in a gearbox housing 119; gearbox housing 119 and motor housing 115
are disposed, by way of example, in tool housing 110. Be it noted,
however, that alternatively thereto, drive motor 114 and gearbox
118 can also be disposed, for example, directly in tool housing
110, e.g. for the case in which impact driver 100 is embodied using
a so-called "open frame" configuration.
[0061] Impact mechanism 122 connected to drive member 120 is, by
way of example, a rotary or rotational impact mechanism that is
equipped with an impact member 125 and generates high-intensity
rotary percussive pulses and transfers them via impact member 125
to output drive shaft 124, for example an output drive spindle.
Illustratively, impact mechanism 122 is disposed in an associated
impact mechanism housing 123, but alternatively thereto can also be
disposed in another suitable housing, e.g. in gearbox housing 119
or in tool housing 110.
[0062] Impact mechanism 122 may be embodied in the manner of a
mechanical impact mechanism for percussively driving output drive
shaft 124, in which impact member 125 is, for example, disposed
longitudinally displaceably and at least partly rotationally
movably on input drive shaft 120 and is spring-loaded there in the
direction of output drive shaft 124. An exemplifying mechanical
impact mechanism with which impact mechanism 122 can be implemented
is described in DE 20 2006 014 850 U1, to which reference is
expressly made here and whose teaching is to be understood as part
of the present description, so that a detailed description of
impact mechanism 122 can be omitted here in the interest of a
concise description.
[0063] Tool receptacle 150, embodied for reception of an inserted
tool 140, is provided by way of example on output drive shaft 124.
This receptacle is embodied illustratively as a clamping chuck
equipped with a clamping sleeve 152, and is therefore also referred
to hereinafter as "clamping chuck 150."According to an embodiment,
a permanent connection is embodied between this clamping chuck 150
and output drive shaft 124 in order to prevent at least tool-free
detachment of clamping chuck 150 from output drive shaft 124.
[0064] In the context of the present invention the term "permanent"
means that no provision is made for removal of clamping chuck 150
from impact driver 100 by a user, and clamping chuck 150 is thus an
integral constituent of impact driver 100. While replacement of
clamping chuck 150 can in principle be possible, for example in
order to avoid acquisition of an entirely new impact driver
following damage, but at least not in tool-free fashion and may be
not without opening tool housing 110. In other words, in the
context of the present invention the term "permanent" therefore
means that clamping chuck 150 is the principal tool receptacle of
impact driver 100 and is not connected to impact driver 100 in the
form of a detachable or exchangeable adapter or tool
attachment.
[0065] An enlarged portion 200 of impact driver 100 is described
below with reference to FIGS. 2, 4, 6, and 8, with differently
embodied clamping chucks that can each be utilized to implement
clamping chuck 150. In the interest of a simplified and concise
description, identical or identically functioning parts are in each
case labeled with identical reference characters and, in principle,
described only once.
[0066] FIG. 2 shows portion 200 of impact driver 100 of FIG. 1 with
an exemplifying clamping chuck 250 which is connected to output
drive shaft 124 of FIG. 1 and with which clamping chuck 150 of FIG.
1 can be implemented in accordance with a first embodiment. Portion
200 elucidates, by way of example, the fastening of impact
mechanism housing 123 on tool housing 110 equipped with manual
switch 128, as well as individual components of impact mechanism
122 that is embodied in the manner of a mechanical impact mechanism
and is disposed in impact mechanism housing 123. These components
encompass impact member 125 that is spring-loaded illustratively by
way of a compression spring 129 in the direction of output drive
shaft 124 and is equipped with at least one drive cam (325, 326 in
FIG. 3) that, by way of example, interacts with at least one output
drive cam 224, 225 provided on output drive shaft 124.
[0067] Illustratively, output drive shaft 124 is mounted in
rotationally movable fashion on input drive shaft 120 via a bearing
peg 212 that is embodied at that axial end of the output drive
shaft which is associated with input drive shaft 120. Output drive
shaft 124 is furthermore, by way of example, mounted in
rotationally movable fashion in a bearing element 270 that is
disposed in an opening 292 that is provided at an axial end 223 of
impact mechanism housing 123 facing toward clamping chuck 250, at
which end an external rubber protective cap 280 is furthermore
illustratively disposed. Bearing element 270 can in this context
be, for example, a bearing sleeve pressed into opening 292 or any
other plain or rolling bearing. In addition, a spacer ring 272 is
disposed by way of example on output drive shaft 124 in the region
between bearing element 270 and output drive cams 224, 225.
[0068] Output drive shaft 124 illustratively has at least one axial
internal recess 222 equipped with an internal thread 221, and
alternatively or additionally thereto an external thread 227 is
embodied on external periphery 226 of output drive shaft 124.
Internal thread 221 and external thread 227 have, by way of
example, counterdirectional screw threads and are provided for
fastening clamping chuck 250.
[0069] Clamping chuck 250 illustratively has a clamping chuck body
255, equipped with an axial passthrough opening 251, on which an
internal thread 254 can be embodied alternatively or additionally
to passthrough opening 251. Internal thread 254 is embodied in an
internal recess 252 that is provided on clamping chuck body 255 and
faces toward axial end 223 of impact mechanism housing 123. Said
recess is approximately cup-shaped, having an open axial end region
which faces toward axial end 223 of impact mechanism housing 123
and through which output drive shaft 124 engages into internal
recess 252, as well as an oppositely located, substantially closed
axial end region in which passthrough opening 251 is embodied.
[0070] Axial passthrough opening 251 is provided, by way of
example, for passage of a screw 260 equipped with an external
thread 262. External thread 262 of screw 260 is embodied here for
thread-joining to internal thread 221 of output drive shaft 124.
Internal thread 254 of clamping chuck body 255 is embodied, by way
of example, for thread-joining to external thread 227 of output
drive shaft 124. Clamping chuck body 255 of clamping chuck 250 can
thus be thread-joined in duplicate fashion, with counterdirectional
screw threads, on output drive shaft 124, so that clamping chuck
250 is fastened on output drive shaft 124 in a manner rotationally
secured in both rotation directions.
[0071] Be it noted that clamping chuck 250 illustratively has
clamping sleeve 152 of FIG. 1 as well as clamping jaws 290. Further
characterization of individual components of clamping chuck 250
has, however, been omitted in the interest of a simple and
comprehensible drawing. A detailed description thereof can thus
also be omitted in the interest of a simple and concise
description, since the construction and mode of operation of a
clamping chuck are sufficiently known as such to one skilled in the
art.
[0072] FIG. 3 shows impact driver 100 of FIG. 1, equipped with
clamping chuck 250 of FIG. 2, in the context of an exemplifying
installation of clamping chuck 250 on output drive shaft 124, in
order to elucidate an exemplifying configuration of impact
mechanism 125, output drive shaft 124, spacer ring 272, bearing
bushing 270, impact mechanism housing 123, rubber protective cap
280, clamping chuck 250, and screw 260. Impact driver 100
illustratively has a carrying strap 310, and impact member 125 is
illustratively equipped with two output drive cams 325, 326.
[0073] FIG. 4 shows portion 200 of impact driver 100 of FIG. 1 with
an exemplifying clamping chuck 450 which is connected to output
drive shaft 124 of FIG. 1 and with which clamping chuck 150 of FIG.
1 can be implemented in accordance with a second embodiment. Here
output drive shaft 124 is embodied by way of example in at least
two pieces, and has a cam member 420 that is equipped with at least
one, and by way of example with two output drive cams 424, 425 and
is connected nonrotatably to an output drive stud 452.
[0074] Output drive stud 452 is fastened nonrotatably via a rigid
connection to clamping chuck 450 and to clamping chuck body 455
associated therewith, and may be shaped onto them or embodied in
one piece with them. Output drive stud 452 is moreover, by way of
example, mounted in rotationally movable fashion in bearing bushing
270.
[0075] Illustratively, output drive stud 452 tapers at a shoulder
454 abutting against cam member 420 and has, at its tapered axial
end connected to cam member 420, a rotationally entrained member
412. The latter is embodied by way of example in the manner of a
polygonal contour on the outer periphery of output drive stud 452,
and by way of example engages in rotationally secured fashion into
a rotationally entraining member 422 embodied correspondingly, and
may be in the manner of a polygonal opening, on cam member 420.
Output drive stud 452 can thereby be pressed into cam member 420 in
order to stabilize the connection. Rotational entrainment of
clamping chuck 450 by output drive shaft 124 can thus be brought
about by way of a positive engagement embodied between rotationally
entraining member 422 and rotationally entrained member 412.
[0076] Cam member 420 is fastened on output drive stud 452
illustratively by way of a securing member 416. The latter is
embodied, by way of example, in the manner of a securing ring that
is disposed in an annular groove 414 provided on output drive stud
452 on a side of cam member 420 (the right in FIG. 4) facing toward
impact member 125. Securing ring 416 can moreover also, as
illustrated, be disposed in a recess embodied on cam member 420 in
order to enable planar abutment of cam member 420 against shoulder
454 of output drive stud 452. Because securing ring 416 is disposed
at the tapered axial end 410 of output drive stud 452--which in
addition, for connection to cam member 420, is illustratively at
least locally mounted in rotationally movable fashion in input
drive shaft 120 - securing ring 416 can be embodied with a
comparatively small diameter.
[0077] Be it noted that clamping chuck 450 as well illustratively
encompasses clamping sleeve 152 as well as clamping jaws 290 of
FIG. 2. Further characterization of individual components of
clamping chuck 450 has, however, as in the case of clamping chuck
250 of FIG. 2, been omitted in the interest of a simple and
comprehensible drawing.
[0078] FIG. 5 shows impact driver 100 of FIG. 1, equipped with
clamping chuck 450 of FIG. 4, in the context of an exemplifying
installation of clamping chuck 450 on impact driver 100, in
particular to elucidate an exemplifying embodiment of output drive
shaft 124, embodied in two pieces, having cam member 420 and having
output drive stud 452 provided on clamping chuck 450, and having
securing ring 416 embodied with a comparatively small diameter.
[0079] FIG. 6 shows portion 200 of impact driver 100 of FIG. 1 with
an exemplifying clamping chuck 650 which is connected to output
drive shaft 124 of FIG. 1 and with which clamping chuck 150 of FIG.
1 can be implemented in accordance with a third embodiment. Output
drive shaft 124 is likewise embodied here, by way of example, in at
least two pieces, and has a cam member 620 and an output drive stud
652. Cam member 620 is equipped with at least one, and by way of
example with two output drive cams 624, 625 and is connected
nonrotatably to output drive stud 652 that is fastened nonrotatably
via a rigid connection to clamping chuck 650 and to clamping chuck
body 655 associated therewith, and may be shaped onto them or
embodied in one piece with them.
[0080] Output drive stud 652 is likewise, by way of example,
mounted in rotationally movable fashion in bearing bushing 270 and
tapers illustratively at a shoulder 654 abutting against cam member
620. Embodied at its tapered axial end 610 connected to cam member
620 is, on the one hand, by way of example an even further tapered
region that is mounted at least locally in rotationally movable
fashion in input drive shaft 120, and on the other hand by way of
example a rotationally entrained member 612 that is embodied e.g.
in the manner of a polygonal contour on the external periphery of
output drive stud 652 and by way of example engages in rotationally
secured fashion into a rotationally entraining member 622 embodied
correspondingly, and may be in the manner of a polygonal opening,
on cam member 620. Output drive stud 652 can thereby be pressed
into cam member 620 in order to stabilize the connection.
Rotational entrainment of clamping chuck 650 by output drive shaft
124 can thus be brought about by way of a positive engagement
embodied between rotationally entraining member 622 and
rotationally entrained member 612.
[0081] Cam member 620 is fastened on output drive stud 652
illustratively by way of a securing member 616 embodied in the
manner of a securing ring, disposed for that purpose, by way of
example, in an annular groove 614 provided on output drive stud 652
on a side of cam member 620 (the left in FIG. 6) facing away from
impact member 125. Securing ring 616 can moreover also, as
illustrated, be disposed in a recess embodied on bearing bushing
270 in order to enable planar abutment of cam member 620 against
bearing bushing 270. Because securing ring 616 is disposed on the
non-tapered region of output drive stud 652, securing ring 616 can
be embodied with a diameter that is enlarged with respect to
securing ring 416 of FIG. 4.
[0082] Be it noted that clamping chuck 650 as well illustratively
encompasses clamping sleeve 152 as well as clamping jaws 290 of
FIG. 2. Further characterization of individual components of
clamping chuck 650 has, however, as also in the case of clamping
chuck 250 of FIG. 2, been omitted in the interest of a simple and
comprehensible drawing.
[0083] FIG. 7 shows impact driver 100 of FIG. 1, equipped with
clamping chuck 650 of FIG. 6, in the context of an exemplifying
installation of clamping chuck 650 on impact driver 100, in
particular in order to elucidate an exemplifying embodiment of
output drive shaft 124, embodied in two pieces, having cam member
620 and having output drive stud 652 embodied on clamping chuck
650, and having securing ring 616 embodied with a comparatively
enlarged diameter. As compared with FIGS. 4 and 5, said ring
replaces spacer ring 272 and securing ring 416 so that here,
advantageously, one component can be eliminated as compared with
the second embodiment.
[0084] FIG. 8 shows portion 200 of impact driver 100 of FIG. 1 with
an exemplifying clamping chuck 850 which is connected to output
drive shaft 124 of FIG. 1 and with which clamping chuck 150 of FIG.
1 can be implemented in accordance with a fourth embodiment. Here
output drive shaft 124, similarly to the case in FIGS. 2 and 3, is
embodied in one piece and is equipped with output drive cams 224,
225 and with at least one, for example, radial passthrough opening
828. Output drive shaft 124 can furthermore embody a rotationally
entraining member 821.
[0085] Rotationally entraining member 821 is illustratively
embodied in a first tapered region 826 of output drive shaft 124,
in which region output drive shaft 124 transitions from output
drive cams 224, 225 to a first shoulder 824. Radial passthrough
opening 828 is also provided, by way of example, in this first
tapered region 826. In addition, first tapered region 826 in turn
tapers at a second shoulder 827 into a second tapered region 829 in
which, by way of example, rotationally entraining member 821 is
embodied, for example in the manner of a polygonal external
contour, for rotational entrainment of clamping chuck 850.
[0086] Clamping chuck 850 illustratively has a clamping chuck body
855 on whose axial end facing toward impact mechanism housing 123
is embodied a fastening portion 858 in which is provided a radial
opening 856 oriented in alignment with radial passthrough opening
828 of output drive shaft 124. Fastening portion 858 illustratively
closes off an internal recess 852 that is provided on clamping
chuck body 855 and widens in the region of an annular shoulder 859
into fastening portion 858. Internal recess 852 is equipped by way
of example with a rotationally entrained member 857 into which
rotationally entraining member 821, embodied on output drive shaft
124, engages in rotationally secured fashion. Output drive shaft
124 can thereby be pressed into clamping chuck body 855 in order to
stabilize the connection.
[0087] Rotationally entraining member 821 is embodied, for example,
in the manner of a polygonal external contour on the external
periphery of second tapered region 829, and rotationally entrained
member 857 is embodied, for example, in the manner of a polygonal
internal contour in internal recess 852. Rotational entrainment of
clamping chuck body 855 and thus of clamping chuck 850 by output
drive shaft 124 can thus be brought about by way of a positive
engagement embodied between rotationally entraining member 821 and
rotationally entrained member 857.
[0088] For rotationally secured fastening of clamping chuck body
855 on output drive shaft 124, an at least locally peg-shaped
securing member 830, which will be referred to hereinafter also as
a "securing pin" in order to simplify the description, is disposed
illustratively in radial passthrough opening 828 of output drive
shaft 124 and at least locally in radial opening 856 of clamping
chuck body 855. Securing pin 830 can, for example, be pressed into
openings 828, 856 or clamp-locked therein, and/or can have an
angled portion in order to prevent securing pin 830 from
undesirably falling out of openings 828, 856 in the context of
installation of clamping chuck 850 on output drive shaft 124.
[0089] In addition, an O-shaped securing ring 840 is disposed in
the region of securing pin 830, for example on clamping chuck body
855, in order to immobilize securing pin 830 in radial opening 856
of clamping chuck 855 and in radial passthrough opening 828 of
output drive shaft 124. This securing ring 840, embodied e.g. from
an elastic polymer, fits around output drive shaft 124 and around
fastening portion 858 of clamping chuck body 855 in the region of
securing pin 830 so as thereby to prevent securing pin 830 from
undesirably falling out of openings 828, 856.
[0090] Be it noted that clamping chuck 850 as well illustratively
encompasses clamping sleeve 152 as well as clamping jaws 290 of
FIG. 2. Further characterization of individual components of
clamping chuck 850 has, however, as also in the case of clamping
chuck 250 of FIG. 2, been omitted in the interest of a simple and
comprehensible drawing.
[0091] FIG. 9 shows impact driver 100 of FIG. 1, equipped with
clamping chuck 850 of FIG. 8, in the context of an exemplifying
installation of clamping chuck 850 on impact driver 100, in
particular in order to elucidate an exemplifying embodiment of
output drive shaft 124 embodied in one piece, and of securing pin
830 and securing ring 840.
* * * * *