EP1946892A2 - Clé à chocs - Google Patents

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Publication number
EP1946892A2
EP1946892A2 EP07022437A EP07022437A EP1946892A2 EP 1946892 A2 EP1946892 A2 EP 1946892A2 EP 07022437 A EP07022437 A EP 07022437A EP 07022437 A EP07022437 A EP 07022437A EP 1946892 A2 EP1946892 A2 EP 1946892A2
Authority
EP
European Patent Office
Prior art keywords
drive shaft
impact
impact wrench
switching ring
impactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07022437A
Other languages
German (de)
English (en)
Other versions
EP1946892A3 (fr
EP1946892B1 (fr
Inventor
Bernd Fleischmann
Jens Zieger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protool GmbH
Original Assignee
Protool GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Protool GmbH filed Critical Protool GmbH
Publication of EP1946892A2 publication Critical patent/EP1946892A2/fr
Publication of EP1946892A3 publication Critical patent/EP1946892A3/fr
Application granted granted Critical
Publication of EP1946892B1 publication Critical patent/EP1946892B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket

Definitions

  • the invention relates to an impact wrench to non-impact mode switchable impact wrench, arranged with a motor driven drive shaft, a coaxial to the drive shaft, rotatably mounted relative to the drive shaft output shaft and a concentric to the drive shaft mounted on this, in driving connection with the drive shaft and by a spring force in Impact body acted upon in the axial direction to the output shaft, which is in rotational driving engagement with the output shaft in a forward position to the output shaft and connected by at least one cam arrangement and an engaging in this control with the drive shaft such that during impact operation of the shock body when on the Output shaft from the outside no counter-torque or a smaller counter-moment acts as a limit counter-moment, assumes its front position and, if on the output shaft from the outside, the limit Martinezmome nt, contrary to the spring force performs an axial movement to the rear with superimposed rotary motion relative to the drive shaft, rotates past the output shaft and then passes under the spring force back into its forward position and exerts a shock on the output shaft in
  • Impact wrenches are used for tightening screws or loosening tightened screws.
  • the impact wrench is attached to the respective screw and in operated according to the tightening or loosening corresponding direction of rotation, so that in the impact mode when the limit counter-torque occurs consecutive, pulse-like blows in the circumferential direction on the output shaft and thus exerted on the screw.
  • a drive shaft in the axial direction enforcing switching pin is present, which is advanced to switch from the impact mode to the non-impact mode, so that it comes into rotationally fixed engagement with the output shaft and this directly rotatably connected to the drive shaft.
  • the present invention has for its object to provide an impact wrench of the type mentioned, with a simple and stable structure and easy to handle manner of impact operation on the non-impact operation can be switched and allowed in non-impact operation, the transmission of relatively large torques.
  • the impactor is locked in non-impact mode on the switching ring with the drive shaft, so that the impactor no longer rotate relative to the drive shaft and thus can not shift axially. Therefore, the impactor can no longer dodge as it were and get out of engagement with the output shaft when acting on the output shaft of the limiting counter-torque. Therefore, the output shaft is always connected rotationally fixed to the drive shaft.
  • the switching ring may have a relatively large diameter, so that correspondingly large torques can be transmitted.
  • the impact wrench 1 is designed as a cordless device.
  • a receptacle for a battery pack is arranged at the bottom of the handle 7.
  • the impact wrench could also be operated with mains power.
  • a user-actuated push-button 10 is arranged at the front, via which a lying in the power supply operating switch 11 is actuated.
  • the output shaft 5 is at the front of the device housing 6 in front of this and can be connected to a turning tool for screwing or unscrewing a screw.
  • the protruding output shaft portion 12 is formed as a square shaft 13 and includes an outgoing from its front polygonal recess 14.
  • a conventional socket wrench can be inserted non-rotatably having a polygonal receptacle for rotationally fixed insertion of a polygonal screw head.
  • a socket wrench can also be attached to the square shank a header, on which in turn a turning tool can be set.
  • the polygonal recess 14, however, can be used for the rotationally fixed insertion of a bit-like turning tool.
  • the impact wrench 1 is switchable from a beating operation to a non-impact operation.
  • the output shaft 5 is independent of the applied torque or regardless of the incoming or ausuformenden from the screw acting on the output shaft counter torque non-rotatably connected without interruption to the drive shaft, so that the impact wrench 1 works like a conventional screwdriver without impact function.
  • the output shaft 5 can be selectively driven in both directions of rotation.
  • the output shaft 5 is rotatably supported relative to the drive shaft 4.
  • the drive shaft 4 on its output shaft 5 side facing a bearing extension 16 which engages in a bearing recess 15 of the output shaft 5 rotatably.
  • the output shaft 5 is rotatably supported in the device housing 6 by means of a pivot bearing 17 arranged on its outer circumference.
  • the output shaft 5 also has at least one, advantageously a plurality of, in particular two diametrically opposed, radially outwardly projecting output drive projections 18, 19 (see in particular the FIGS. 2, 3 and 6 ), so that in the circumferential direction between the output driving projections 18, 19 spaces 20, 21 are formed.
  • a concentric with the drive shaft 4 arranged impactor 22 is mounted, which is in a manner to be described in driving connection with the drive shaft 4, but it can perform on the drive shaft 4 an axial movement with superimposed rotary motion.
  • the impactor 22 is acted upon by a spring force applied by a coil spring 23 in the direction of the output shaft 5 and takes except in the impact mode when acting on a counter-torque exceeding the counter-torque under the spring force to the output shaft 5 toward a forward forward position, which in the Drawing is shown. In this front position, the striker 22 is in rotational engagement with the output shaft 5.
  • the striker 22 at its output shaft 5 facing end in the number of output driving projections 18, 19 of the output shaft 5 corresponding drive driving projections 24, 25, the protrude in the axial direction of the impactor body 22 and engage in the front position of the impactor body 22 in each case in one of the intermediate spaces 20, 21 between the output drive projections 18, 19.
  • the driving entrainment projections 24, 25 have a smaller circumferential extent than the intermediate spaces 20, 21 between the driven entrainment projections 18, 19, so that the impactor body 22 and the output shaft 5 are relatively rotatable relative to one another. If the striking body is in its forward position, the driving entrainment projections 24, 25 lie in the direction of rotation of the drive shaft 4 on the driven entrainment projections 18, 19, so that the output shaft 5 is taken in the direction of rotation.
  • the impactor body 22 and the drive shaft 4 are connected to each other via two diametrically opposite cam assemblies 26, 27, each with associated and in the respective control cam assembly 26, 27 engaging control 28, 29 in the form of a control ball 30, 31.
  • two cam arrangements would suffice.
  • each control cam arrangement 26, 27 has a V-shaped extending control groove 32 on the outer circumference of the drive shaft 4, in which the respective control ball 30, 31 engages.
  • the tip of the V-shape of the cam groove 32 faces the output shaft 5.
  • the respective control ball 30, 31 protrudes from the relevant control groove 32 of the drive shaft 4 and abuts a respective control surface 33 on the inner periphery of the impactor 22.
  • FIG. 7 is the control surface 33 indicated by dash-dotted lines.
  • the control surface 33 is formed on the inner circumference of the impactor body 22 at the transition to an extension 34, facing the output shaft 5, of the inner cross-section of the impactor body 22.
  • the control surface 33 also has a V-shaped profile, wherein the tip of the V, however, faces away from the output shaft 5.
  • a control groove corresponding course could be provided on the inner periphery of the impactor 22.
  • the striking body 22 during impact operation when the output shaft 5 from the outside a larger counter-torque than the limit counter-torque is applied, against the spring force axial movement to the rear with superimposed Rotary movement relative to the drive shaft 4, so that the striking body 22 rotates past the output shaft 5 and then again under the spring force forward to the front position and thereby with its drive-driving projections 24, 25 in the spaces 20, 21 against the output driving projections 18, 19 of the output shaft 5 is moved, so that in the circumferential direction a blow to the output driving projections 18, 19 and thus exerted on the output shaft 5.
  • a switching ring 35 is present, which can be actuated by means of an actuating device 36 from the outside and between an impact position associated with the inoperative position and the non-impact mode associated effective position.
  • the switching ring 35 is arranged radially outside of the drive shaft 4 concentric with this.
  • the switching ring 35 is rotatably mounted on a rotatably connected to the drive shaft 4 switching ring bearing part 37 and axially displaceable. In its inoperative position ( Figures 2 . 4 and 5 ) is the switching ring 35 away from the impactor 22, so that the impactor 22 is unaffected by the switching ring 35.
  • the switching ring 35 moves you the switching ring 35, however, in its operative position to the impactor 22 back, the switching ring 35 comes into rotationally fixed locking engagement with the impactor 22.
  • the switching ring 35 a plurality of distributed over the circumference, the impactor 22 projecting toward locking projections 38 on (in principle, only such a locking projection 38 could be present).
  • Each locking projection 38 is assigned a arranged at the facing end of the impactor 22 locking recess 39.
  • the locking projections 38 engage in the locking recesses 39, so that the striking body 22 is rotatably connected to the switching ring 35.
  • the arrangement could also be made so that the locking projections on the striker and the locking recesses are arranged on the switching ring.
  • Another advantage of the impact wrench 1 is that the impactor body 22 in the inoperative position of the switching ring 35 automatically off such a rotational position relative to the switching ring 35 assumes that the locking recesses 39 of the impactor 22 in the axial direction in alignment with the locking projections 38 of the switching ring 35 are arranged so that the switching ring 35 immediately enters his locking into the operative position with its locking projections 38 in the locking recesses 39 of the impactor body 22 and no further manipulations are required to bring the locking projections 38 and the locking recesses 39 in an aligned position.
  • the end face regions 40, 41 of the striking body 22 arranged between two respective locking recesses 39 have a course which is recessed with respect to the mouths of the locking recesses 39, so that the aforementioned end face regions 40, 41 form depressions on the end face of the striking body 22. In this way it is avoided that the latching projections 38 of the switching ring 35 can collide with the end face of the impactor 22 in impact mode.
  • the transmission unit 3 includes a drive shaft 4 driving planetary gear.
  • this planetary gearset includes a set of planetary gears 42 distributed over the circumference, which radially inwardly mesh with a sun gear 43 driven by the drive motor 2 and radially outwardly with a ring gear 44 enclosing the set of planetary gears 42.
  • the planetary gears 42 are each rotatably mounted on a Planetenradwelle 45 which project from an annular peripheral web body 46 which is arranged on the impactor 22 side facing the planetary gear 42.
  • the drive shaft 4 is rotatably and axially fixedly connected to the web body 46, so that the drive shaft 4 is driven via the planetary gear.
  • the planetary gear mechanism is a multi-stage, switchable planetary gear.
  • the planetary gear mechanism has a web body facing the striking body 22, that is, the web body 46.
  • This web body 46 is designed such that it also forms the switching ring bearing part 37.
  • the switching ring 35 is rotatably mounted on the outer circumference of the web body 46 and axially displaceable. In this way, no separate switching ring bearing part is required, so that results in a low-part arrangement.
  • the web body 46 has a smaller diameter than the impactor 22, so that the web body 46, as shown in FIGS. 4 and 5 it can be seen, a piece immersed in the impactor 22.
  • groove-like, axially directed guideways 47 are arranged on the outer periphery of the web body 46.
  • the arrangement is suitably made so that the locking projections 38 of the switching ring 35 run radially inward in the guideways 47 and engage in the non-impact operation with its radially outer region in the locking recesses 39 of the impactor body 22.
  • the striker 22 acting on the front coil spring 23 is supported with its rear end on the web body 46, which is arranged fixed in the axial direction.
  • the coil spring 23 rotates during operation of the impact wrench 1 with.
  • the impactor 22 has an open towards the rear, annular circumferential recess 48 into which engages the coil spring 23 and is mounted with the respective end.
  • the web body 46 also forms an annular circumferential recess 49, which is open towards the front and receives the rear end of the coil spring 23. This contributes to the space-saving design. In principle, only one of the two recesses 48, 49, expediently the recess 48 in the impactor 22, could be present.
  • the actuating device 36 with which the switching ring 35 can be displaced, has an externally on the device housing 6 movably arranged actuating element 50, from the movement of the axial displacement movement of the switching ring 35 is derived.
  • the switching ring 35 on its outer circumference on a circumferential annular groove 51 into which a suitably U-like switching bracket 52 engages, which preferably consists of wire material.
  • the switch bracket 52 is movable in the axial direction and is actuated by means of the actuating element 50.
  • the switching bracket 52 During operation of the impact wrench 1, the switching bracket 52 remains in the direction of rotation, and the switching ring 35 rotates past the switching bracket 52.
  • the actuating element 50 is formed in the expedient embodiment of an annular, rotatably mounted on the housing 6 rotary valve 53 which is connected to the switch bracket 52 so that its rotational movement is converted into the axial displacement movement of the switching ring 35.
  • This movement conversion takes place by means of a flat shape having deflecting part 54, on the one hand carries the switching bracket 52 and on the other hand with the rotary valve 53 in engagement is that the switching bracket 52 and with this the switching ring 35 moves in the axial direction when the rotary valve 53 is rotated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP20070022437 2007-01-20 2007-11-20 Clé à chocs Active EP1946892B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710003037 DE102007003037A1 (de) 2007-01-20 2007-01-20 Schlagschrauber

Publications (3)

Publication Number Publication Date
EP1946892A2 true EP1946892A2 (fr) 2008-07-23
EP1946892A3 EP1946892A3 (fr) 2009-06-03
EP1946892B1 EP1946892B1 (fr) 2011-05-04

Family

ID=39284012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070022437 Active EP1946892B1 (fr) 2007-01-20 2007-11-20 Clé à chocs

Country Status (2)

Country Link
EP (1) EP1946892B1 (fr)
DE (2) DE102007003037A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2168724A1 (fr) * 2008-09-25 2010-03-31 BLACK & DECKER INC. Outil d'impact hybride
WO2012002578A1 (fr) * 2010-06-30 2012-01-05 Hitachi Koki Co., Ltd. Outil à percussion
EP2476519A1 (fr) * 2009-09-10 2012-07-18 Positec Power Tools (Suzhou) Co., Ltd Outil motorisé
CN106166722A (zh) * 2015-05-22 2016-11-30 罗伯特·博世有限公司 具有机械式旋转冲击机构的手持式工具机
CN112703087A (zh) * 2018-07-27 2021-04-23 费斯托工具有限责任公司 手持式工具机器、尤其冲击式旋拧器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101948A1 (de) 2017-02-01 2018-08-02 Festool Gmbh Schlagschrauber

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1050381A2 (fr) 1999-04-30 2000-11-08 Matsushita Electric Works, Ltd. Outil à chocs rotatif

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2828640B2 (ja) * 1988-11-15 1998-11-25 松下電工株式会社 回転衝撃工具
DE4301610C2 (de) * 1993-01-22 1996-08-14 Bosch Gmbh Robert Schlagschrauber
JP4405900B2 (ja) * 2004-03-10 2010-01-27 株式会社マキタ インパクトドライバ
US20060237205A1 (en) * 2005-04-21 2006-10-26 Eastway Fair Company Limited Mode selector mechanism for an impact driver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1050381A2 (fr) 1999-04-30 2000-11-08 Matsushita Electric Works, Ltd. Outil à chocs rotatif

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2168724A1 (fr) * 2008-09-25 2010-03-31 BLACK & DECKER INC. Outil d'impact hybride
EP2476519A1 (fr) * 2009-09-10 2012-07-18 Positec Power Tools (Suzhou) Co., Ltd Outil motorisé
EP2476519A4 (fr) * 2009-09-10 2013-10-23 Positec Power Tools Suzhou Co Outil motorisé
WO2012002578A1 (fr) * 2010-06-30 2012-01-05 Hitachi Koki Co., Ltd. Outil à percussion
CN102971113A (zh) * 2010-06-30 2013-03-13 日立工机株式会社 冲击工具
CN102971113B (zh) * 2010-06-30 2015-03-25 日立工机株式会社 冲击工具
US9522461B2 (en) 2010-06-30 2016-12-20 Hitachi Koki Co., Ltd. Impact tool
CN106166722A (zh) * 2015-05-22 2016-11-30 罗伯特·博世有限公司 具有机械式旋转冲击机构的手持式工具机
CN112703087A (zh) * 2018-07-27 2021-04-23 费斯托工具有限责任公司 手持式工具机器、尤其冲击式旋拧器
US11986929B2 (en) 2018-07-27 2024-05-21 Festool Gmbh Handheld machine tool, in particular impact driver

Also Published As

Publication number Publication date
DE102007003037A1 (de) 2008-07-24
EP1946892A3 (fr) 2009-06-03
EP1946892B1 (fr) 2011-05-04
DE502007007112D1 (de) 2011-06-16

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