EP0429475B1 - Bohr- oder schlaghammer - Google Patents

Bohr- oder schlaghammer Download PDF

Info

Publication number
EP0429475B1
EP0429475B1 EP89908388A EP89908388A EP0429475B1 EP 0429475 B1 EP0429475 B1 EP 0429475B1 EP 89908388 A EP89908388 A EP 89908388A EP 89908388 A EP89908388 A EP 89908388A EP 0429475 B1 EP0429475 B1 EP 0429475B1
Authority
EP
European Patent Office
Prior art keywords
guide tube
hammer
tool holder
guide
hammer according
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.)
Expired - Lifetime
Application number
EP89908388A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0429475A1 (de
Inventor
Ulrich Ranger
Karl Wanner
Johann Kaltenecker
Manfred Hellbach
Gerhard Meixner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0429475A1 publication Critical patent/EP0429475A1/de
Application granted granted Critical
Publication of EP0429475B1 publication Critical patent/EP0429475B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves

Definitions

  • the invention is based on a percussion hammer according to the preamble of claim 1.
  • a fixed guide tube in which pistons and clubs are guided tightly and slidably, is surrounded by a control body which is used for idle control is axially displaceable.
  • the control body engages around the end of the guide tube in such a way that a collar of the intermediate striker comes to rest on the bottom of the control body and this can thereby be pushed axially inward in the impact mode.
  • Such a design has the disadvantage that it is only suitable for pure chisel hammers, but not for rotary hammers with rotary drive.
  • a rotary drive of the guide tube is not possible and the rotary movement is also not transferable to the tool holder, since the control body stands in the way of a connection of the guide tube to the tool holder.
  • the additional control body causes an increased manufacturing effort and is a hindrance if the hammer is to be supplemented by further functions.
  • a generic hammer drill is known from FR-A 21 62 883, in which the guide tube is axially fixed in the housing.
  • a slotted ring is used here as an idling catch device, which is expanded by the percussion piston when the tool is not pressed against the workpiece. This construction requires the not inconsiderable frictional force between the ring and the percussion piston to be overcome in order to start the hammer.
  • the impact hammer according to the invention with the characterizing features of claim 1 has the advantage that an additional control sleeve can be omitted entirely, since the guide tube itself is axially displaceable. This enables a rotary drive of the hammer or guide tube, which can be transferred to the tool holder, with a simple and part-saving structure of the striking mechanism.
  • the idle behavior is improved by a larger distance between the racket and the idle hole.
  • Claims 3 - 5 describe particularly inexpensive or easy-to-manufacture designs of the striking mechanism or of the rotary drive for the tool holder.
  • the racket is constantly pushed against the striker when idling and thus the idling is guaranteed much more reliably - even when the machine is held vertically upwards.
  • the hammer with the characterizing features of claim 12 has the advantage that the switching device for switching on or off or blocking the rotary movement is very simple and very inexpensive and easy to manufacture. Such a switching ring with only a single toothing can also be used for switching a hammer mechanism on or off.
  • FIGS. 1A and 1B show a longitudinal section through a hammer drill according to a first embodiment in two different positions of the guide tube.
  • FIG. 2 shows a second embodiment in longitudinal section and
  • FIG. 3 shows a third embodiment, for which the striking position is shown in FIG. 3A and the idling position of the striking mechanism in FIG. 3B.
  • FIGS. 4 and 5 each show a fourth and a fifth exemplary embodiment of hammers with an L arrangement of striking mechanism and motor in longitudinal section.
  • a motor 2 Arranged in a housing 1 of a hammer drill and percussion hammer is a motor 2, shown schematically in FIG. 1, and an impact mechanism 3, to which a tool holder 4 with inserted tool 5 is connected at the front.
  • a piston 7 driven by the motor 2, a racket 8 and a striker 9 are guided.
  • the guide tube 6 has longitudinal teeth 10 at the rear on the circumference, which mesh with a gear 11.
  • An intermediate shaft can also be connected between the guide tube 6 and the gear 11.
  • a refill hole 12 to compensate for the air loss in the air cushion space 13 and one or more idle control openings 14 are arranged in the wall of the guide tube 6, a refill hole 12 to compensate for the air loss in the air cushion space 13 and one or more idle control openings 14 are arranged.
  • the two openings 12, 14 lie outside the piston path in which the air cushion is compressed, that is outside the compression range.
  • the guide tube 6 has a ventilation hole 15 for the space 16 in front of the racket and a throttle hole 17 for damping the empty stroke.
  • the guide tube has an inward-reaching collar 18 which guides the anvil 9 and a longitudinal toothing 19 which engages in a toothing 21 of the tool holder 4.
  • the tool holder 4 is rotatably held relative to the housing 1 by means of a bearing 22.
  • the rotational movement of the tool holder 4 is z. B. via not shown projections, engage in the grooves in the shank of the tool 5, transferred to this.
  • a first guide piece 25 which is integrally connected to the housing 1 and is formed as a collar, and a second guide piece 24 pressed into the housing.
  • the first guide piece 25 can also be designed as a guide ring to be inserted into the housing.
  • a compression spring 26 is supported against the guide piece 25 and, on the other hand, bears against a retaining ring 28 fixed in the guide tube 6 by a locking ring 27.
  • the axial displacement of the guide tube 6 is limited at the front by the tool holder 4 and at the rear by a stop on the housing 1.
  • the striker 9 has in the middle a collar 30 and an O-ring 31 which bears against a retaining ring 32 secured in the guide tube 6.
  • the striking mechanism 3 is shown in FIG. 1A in the striking position and in FIG. 1B in the idle position.
  • the piston 7 is at the left or front dead center.
  • the control opening 14 is in impact operation closed by the guide piece 25.
  • the idle control opening 14 and also the refill hole 12 are additionally closed by the striker 8.
  • the spring 26 presses the guide tube 6 forward in the direction of the tool holder 4 (FIG. 1B).
  • the control opening 14 thus comes out of the region of the guide piece 25 and is open.
  • a negative pressure in the air cushion space 13, which pulls the bat 8 back, can no longer build up.
  • the empty stroke of the racket 8 is damped by the narrow throttle bore 17, which is now also exposed.
  • the vent hole 15 is covered by the guide piece 24.
  • the racket can run further forward than shown in FIG. 1B by pushing the striker 9 forward by the distance A between the collar 30 of the striker and the collar 18 of the guide tube 6. This increases the distance B between the rear edge of the racket 8 and the idle bore 14. This reduces the risk that the racket may eventually run back into the area of the idle control opening 14 and inadvertently close it.
  • the rotary drive of the hammer is ensured via the longitudinal teeth 10 in every axial position of the guide tube; likewise the forwarding of the rotary movement to the tool holder 4.
  • the hammer can also be designed as a pure impact hammer without a rotary drive in the same cost-effective manner with a sliding guide tube, as shown in FIG. 2.
  • the embodiment of Figure 2 largely corresponds to the first.
  • the same reference numbers were used, which are indicated by a Indent were added.
  • the tool holder 4 ' is rigidly connected to the housing 1'.
  • the guide tube 6 ' is not driven to rotate.
  • a z. B. used as a rubber membrane valve 34. It lies in the flow path of the air from the control opening 14 'to the large-volume interior of the hammer.
  • the valve 34 opens in order to prevent the formation of a negative pressure in the air cushion space 13'.
  • the valve 34 closes, so that the racket is pushed forward against the striker 9' by the air cushion which forms.
  • FIG. 3 an embodiment with pot piston 107 is shown.
  • the parts which correspond to those in the exemplary embodiments in FIGS. 1 and 2 are provided with reference numbers increased by 100.
  • the pot piston 107 has one or more bores 135 in its side wall, one of which comes into congruence with the refill bore 112 during impact operation. This always happens when the piston 107 is at the front dead center, as shown in FIG. 3.
  • the guide piece 125 on the housing 101 has two O-rings 136, 137 for additional sealing with respect to the control opening 114. It carries a collar 138 as an axial stop for the guide tube 106. In the striking position shown in FIG. 3A, the idle control opening 114 is sealed by the guide piece 125 .
  • the guide tube 106 has on its inside in the area of the idle control opening 114 a flat annular groove 139. Via this annular groove, the control opening 114 and the bore 135, the air cushion space 113 is ventilated when idling, as can be seen from FIG. 3B.
  • the annular groove is dimensioned such that it is connected to the bore 135 in every position of the piston 107.
  • the function of the striking mechanism corresponds to that of the first embodiment.
  • a gearwheel for the percussion drive and a toothed spur gear 241 are driven by the motor pinion 240.
  • the spur gear 241 carries as a second toothing a bevel gear 243.
  • This meshes with a bevel gear 244 which is mounted in the housing 201 and which has a sleeve-shaped base body and has coupling claws 245 opposite the bevel gear 243.
  • An axially displaceable shift ring 246 with teeth 247 can be inserted into the claws 245. This engages with a longitudinal toothing 248 on the circumference of the guide piece 225 designed as a sleeve.
  • the switching ring 246 can optionally also be engaged in claws 249, which are firmly connected to the housing 201.
  • the longitudinal toothing 248 and the claws 245 and 249 have the same pitch and the toothing 247 is designed such that it can simultaneously engage in the longitudinal toothing 248 and in the claws 245 and 249. This enables the use of a simple stamped part as a switching ring 246.
  • the guide piece 225 is firmly connected to the tool holder 204 in its front region, but the elements can also be in two parts.
  • the guide tube 206 has a vent hole 251 for the space in front of the racket 208 and openings 252 in the area of the bevel gear 244 for venting when idling.
  • the openings 252 are idle in connection with a recess 253 which connects the idle bores 214 to one another.
  • the idle control openings 214 are sealed by the guide piece 225.
  • the switching ring 246 is in a neutral position, so that the guide piece 225 is neither driven in rotation nor blocked against rotation. So that's the Tool holder freely rotatable.
  • the switching ring engages in the claws 249 the tool holder 204 is blocked in a rotationally fixed manner; when the switching ring engages in the claws 245, the tool holder is driven in rotation.
  • a lever (not shown) which extends through the housing 201 (for example an eccentric lever) acts on the non-toothed part of the switching ring 246 in a known manner.
  • the spring 226 presses the guide tube 206 to the left or forward, so that the recess 253 establishes a connection between the control openings 214 and the openings 252.
  • the air cushion space 213 is thus ventilated in idle mode as in the previous exemplary embodiments.
  • FIG. 5 is similar to that according to FIG. 4 with the difference that the guide tube 306 is connected in one piece to the tool holder 304. Parts which correspond to those in FIGS. 1 and 4 are identified by reference numbers increased by 300 and 100, respectively.
  • the rotary drive is transmitted via the bevel gear 343 to the beveled guide piece 325.
  • the guide piece 325 covers the idle control opening 314 as in the previous exemplary embodiments.
  • a ventilation channel 356 extends from a recess 355 on the inside of the guide piece 325 into the interior of the housing.
  • the guide piece 325 is supported against a sleeve 357 which bears against a housing part 358.
  • the sleeve 357 is toothed on the outside and inside and engages on the one hand in longitudinal teeth 310 on the guide tube 306 and on the other hand in an internal toothing of the switching ring 346.
  • the guide tube 306 merges in one piece into the tool holder 304 with a locking element 360 for the tool 305.
  • the locking element 360 is an axially displaceable retaining ring 361 locked. This is supported forward against a tool holder housing part 362, which is fixed axially relative to the tool holder 304 by a locking ring 363.
  • a compression spring 326 is supported against the retaining ring 361, the other end of which rests on a securing ring 364 inserted into the housing part 358.
  • the locking ring 364 or the disk 365 lying thereon also serves as a stop for the axially displaceable guide tube 306.
  • a double-bent angle ring 366 is provided which, with its inner flanging, engages a shoulder 367 of the guide tube 306 and the outer flanging of the disk 365 opposite, an O-ring 368 dampens the impact on the disc 365 occurring during idling.
  • the guide tube 306 when transitioning to idling, the guide tube 306 is displaced axially forward in the direction of the tool.
  • the spring 326 presses the entire tool holder including the guide tube 306 forward until the angle ring 366 or the O-ring 368 hits the disk 365.
  • a connection is established between the idle control opening 314 and the recess 355 of the guide piece 325.
  • the air exchange between the air cushion space 313 and the interior of the housing or the atmosphere takes place via the ventilation channel 356 and the gaps between the guide piece 325 and the sleeve 357.
  • the rotational movement is further transmitted to the guide tube 306 via the longitudinal teeth 310 and the sleeve 357 if the switching ring 346 is coupled into the claws 345.
  • the spring 326 fulfills two functions. In addition to the shift shift for idling, it takes over the locking of the elements 360 by exerting a closing force on the retaining ring 361. Instead of a single spring 326, two separate springs can also be provided in the same position. B. on an attached to the forked part of the tool holder housing part 362, inward collar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP89908388A 1988-08-02 1989-07-19 Bohr- oder schlaghammer Expired - Lifetime EP0429475B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3826213A DE3826213A1 (de) 1988-08-02 1988-08-02 Bohr- oder schlaghammer
DE3826213 1988-08-02

Publications (2)

Publication Number Publication Date
EP0429475A1 EP0429475A1 (de) 1991-06-05
EP0429475B1 true EP0429475B1 (de) 1993-09-29

Family

ID=6360076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89908388A Expired - Lifetime EP0429475B1 (de) 1988-08-02 1989-07-19 Bohr- oder schlaghammer

Country Status (5)

Country Link
US (1) US5111890A (ja)
EP (1) EP0429475B1 (ja)
JP (1) JP2746712B2 (ja)
DE (2) DE3826213A1 (ja)
WO (1) WO1990001400A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724531B4 (de) * 1997-06-11 2005-07-14 Robert Bosch Gmbh Bohrhammer

Families Citing this family (62)

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JP2552566B2 (ja) * 1990-04-05 1996-11-13 株式会社マキタ 打撃工具
DE4239294A1 (de) * 1992-11-23 1994-05-26 Black & Decker Inc Bohrhammer mit pneumatischem Schlagwerk
DE4241000A1 (de) * 1992-12-05 1994-06-09 Bosch Gmbh Robert Bohr- und/oder Schlaghammer
JP2602411Y2 (ja) * 1993-11-26 2000-01-17 日立工機株式会社 打撃工具の切換機構
JP3424870B2 (ja) * 1995-02-28 2003-07-07 株式会社マキタ 打撃工具の空打ち防止装置
JP3459493B2 (ja) * 1995-05-25 2003-10-20 株式会社マキタ 打撃工具
JP3424880B2 (ja) * 1995-08-18 2003-07-07 株式会社マキタ ハンマードリル
JP3292969B2 (ja) * 1995-08-18 2002-06-17 株式会社マキタ ハンマードリル
JP3292972B2 (ja) * 1996-03-29 2002-06-17 株式会社マキタ 打撃工具
DE19714287A1 (de) * 1997-04-07 1998-10-08 Hilti Ag Bohr- und/oder Meisselgerät
DE19714288A1 (de) * 1997-04-07 1998-10-08 Hilti Ag Bohr- und/oder Meisselgerät
US5954140A (en) * 1997-06-18 1999-09-21 Milwaukee Electric Tool Corporation Rotary hammer with improved pneumatic drive system
DE19810088C1 (de) * 1998-03-10 1999-08-26 Bosch Gmbh Robert Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk
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GB9902789D0 (en) * 1999-02-09 1999-03-31 Black & Decker Inc Rotary hammer
GB9910599D0 (en) * 1999-05-08 1999-07-07 Black & Decker Inc Rotary hammer
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DE19933972A1 (de) * 1999-07-20 2001-01-25 Bosch Gmbh Robert Bohr- oder Schlaghammer
DE10021355B4 (de) * 2000-05-02 2005-04-28 Hilti Ag Schlagendes Elektrohandwerkzeuggerät mit schwingungsentkoppelten Baugruppen
DE10103141A1 (de) * 2001-01-24 2002-07-25 Hilti Ag Elektrohandwerkzeuggerät mit Leerschlagabschaltung
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DE10121088A1 (de) * 2001-04-28 2002-11-07 Bosch Gmbh Robert Bohr- und/oder Meißelhammer
US7032683B2 (en) * 2001-09-17 2006-04-25 Milwaukee Electric Tool Corporation Rotary hammer
DE10156388A1 (de) * 2001-11-16 2003-06-05 Bosch Gmbh Robert Handwerkzeugmaschine mit einem pneumatischen Schlagwerk
GB0213464D0 (en) * 2002-06-12 2002-07-24 Black & Decker Inc Hammer
US7527272B2 (en) * 2002-09-18 2009-05-05 Robert Bosch Gmbh Chuck
GB2394517A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Powered hammer having a spindle lock with synchronising element
DE10261030A1 (de) 2002-12-24 2004-07-08 Robert Bosch Gmbh Bohrhammer
GB2401570B (en) * 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
DE10333799B3 (de) * 2003-07-24 2005-02-17 Wacker Construction Equipment Ag Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung
DE102004012433A1 (de) 2004-03-13 2005-09-29 Robert Bosch Gmbh Handwerkzeugmaschine
US7140450B2 (en) * 2004-10-18 2006-11-28 Battelle Energy Alliance, Llc Percussion tool
JP4446248B2 (ja) * 2004-11-24 2010-04-07 日立工機株式会社 ハンマドリル
US7325624B2 (en) * 2004-11-24 2008-02-05 Hitachi Koki Co., Ltd. Hammer drill having switching mechanism for switching operation modes
DE102005019710A1 (de) * 2005-04-28 2006-11-09 Robert Bosch Gmbh Handwerkzeugmaschinenschlagwerkeinheit
DE102005019711A1 (de) * 2005-04-28 2006-11-09 Robert Bosch Gmbh Handwerkzeugmaschinenschlagwerkeinheit
DE102005035099A1 (de) * 2005-07-27 2007-02-01 Robert Bosch Gmbh Schlagwerk und wenigstens schlagend antreibbare Handwerkzeugmaschine mit einem Schlagwerk
US7164252B1 (en) 2005-07-29 2007-01-16 Battelle Energy Alliance, Llc Electrically powered hand tool
BG66156B1 (bg) * 2007-09-21 2011-09-30 "Спарки Елтос" АД Ударен механизъм за електрически преносими ударно-пробивни машини
US7681658B2 (en) * 2007-11-06 2010-03-23 Maurice DUVAL Pneumatic impact tool
DE102007056531A1 (de) * 2007-11-23 2009-05-28 Hilti Aktiengesellschaft Handwerkzeugmaschine mit Schlagwerkzeugaufnahme und zugeordnetes Werkzeug
JP5245667B2 (ja) * 2008-09-12 2013-07-24 日立工機株式会社 打込機
DE102010001683A1 (de) * 2010-02-09 2011-08-11 Robert Bosch GmbH, 70469 Handwerkzeugmaschinenvorrichtung
DE102011007433A1 (de) * 2010-04-20 2011-12-08 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
DE102010029915A1 (de) 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine und Steuerungsverfahren
DE102010029917A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine
DE102011081617A1 (de) 2011-08-26 2013-02-28 Hilti Aktiengesellschaft Handgehaltene Werkzeugmaschine
DE102011081711A1 (de) 2011-08-29 2013-02-28 Metabowerke Gmbh Luftpolster-Schlagwerk für einen motorisch angetriebenen Bohr- oder Schlaghammer
US9308636B2 (en) 2012-02-03 2016-04-12 Milwaukee Electric Tool Corporation Rotary hammer with vibration dampening
DE102012206445A1 (de) * 2012-04-19 2013-10-24 Hilti Aktiengesellschaft Werkzeugmaschine
DE102012212231A1 (de) 2012-07-12 2014-01-16 Hilti Aktiengesellschaft Handwerkzeugmaschine
GB201216905D0 (en) * 2012-09-21 2012-11-07 Black & Decker Inc A hammer drill
GB201216903D0 (en) * 2012-09-21 2012-11-07 Black & Decker Inc A hammer drill
DE102012220886A1 (de) 2012-11-15 2014-05-15 Hilti Aktiengesellschaft Werkzeugmaschine
EP3181298A1 (de) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Schlagende werkzeugmaschine
EP3181300A1 (de) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Schlagende handwerkzeugmaschine
EP3181299A1 (de) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Schlagende handwerkzeugmaschine
EP3181301A1 (de) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Schlagende handwerkzeugmaschine
CN108544430B (zh) * 2018-06-04 2023-07-18 广西玉柴机器股份有限公司 铝堵气锤冲头装置
EP3875224A1 (de) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Vorrichtung zum verstellen eines meissels
US11819989B2 (en) 2020-07-07 2023-11-21 Techtronic Cordless Gp Powered fastener driver
CA3167425A1 (en) 2021-07-16 2023-01-16 Techtronic Cordless Gp Powered fastener driver

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724531B4 (de) * 1997-06-11 2005-07-14 Robert Bosch Gmbh Bohrhammer

Also Published As

Publication number Publication date
DE3826213A1 (de) 1990-02-15
US5111890A (en) 1992-05-12
WO1990001400A1 (de) 1990-02-22
EP0429475A1 (de) 1991-06-05
DE58905786D1 (de) 1993-11-04
JP2746712B2 (ja) 1998-05-06
JPH04500043A (ja) 1992-01-09

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