EP0050192A1 - Perceuse à percussion - Google Patents

Perceuse à percussion Download PDF

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Publication number
EP0050192A1
EP0050192A1 EP81105591A EP81105591A EP0050192A1 EP 0050192 A1 EP0050192 A1 EP 0050192A1 EP 81105591 A EP81105591 A EP 81105591A EP 81105591 A EP81105591 A EP 81105591A EP 0050192 A1 EP0050192 A1 EP 0050192A1
Authority
EP
European Patent Office
Prior art keywords
intermediate shaft
hammer drill
drill according
hub body
axial
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
EP81105591A
Other languages
German (de)
English (en)
Other versions
EP0050192B2 (fr
EP0050192B1 (fr
Inventor
Manfred Bleicher
Manfred Dipl.-Ing. Buck
Jörg Fälchle
Karl Dr.-Ing. Wanner
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6114858&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0050192(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0050192A1 publication Critical patent/EP0050192A1/fr
Application granted granted Critical
Publication of EP0050192B1 publication Critical patent/EP0050192B1/fr
Publication of EP0050192B2 publication Critical patent/EP0050192B2/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • 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
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate

Definitions

  • the invention relates to a hammer drill according to the type of the main claim (DE-OS 24 49 191, R. 2377).
  • a hammer drill has already become known, in which the striking mechanism was automatically started up when the tool held in the tool holder of the hammer drill was attached to the workpiece to be machined. This is done by a longitudinal movement of the tool holder, wherein a clutch that sets the striking mechanism in motion is actuated. To keep the clutch in its engaged position, the operator must always overcome the force of a spring that tries to disengage the clutch. Pure drilling without axial loading of the tool is not possible with the known hammer drill.
  • the hammer drill according to the invention with the characterizing features of the main claim has the advantage that in the - desired by the operator - percussion drilling the clutch over which the wobble disc drive is set in motion is held in engagement by a clutch. This significantly simplifies the handling of the rotary hammer.
  • This hammer drill also offers the option of being used as a drilling machine. This opens up the possibility of creating a light hand drill, which is therefore suitable for home improvement, but which can still be used with the highly effective air cushion hammer mechanism that was previously reserved for relatively heavy handicraft machines.
  • FIG. 1 shows a rotary hammer in partial longitudinal section
  • FIG. 2 shows a cross section along II-II in FIG. 1
  • FIG. 3 shows a transmission development
  • FIG. 4 shows a longitudinal section through an intermediate shaft of the rotary hammer in the position of use corresponding to FIG. 1 along IV-IV of FIGS. 3 and 4
  • Figure 5 shows a second embodiment of an intermediate shaft according to Figure 3 in longitudinal section.
  • FIG. 3 contains two partial cuts rotated about the axis of the intermediate shaft in the plane of the drawing.
  • the viewing directions are designated III 'and III "in FIG. 3; the corresponding areas are numbered the same in FIG. 2.
  • the hammer drill shown in Figure 1 of the drawing has a metal gear housing 1, which is arranged in an outer plastic shell 2. At its front end, the plastic shell merges into a cylindrical housing extension 3, which is designed, for example, for clamping additional devices - here a handle 4. At the front end of the housing extension 3, a tool holder 5 is arranged on the hammer drill, which is used to hold tools (not shown) - here a drill 6. At the rear end facing away from the tool holder 5. a pistol handle 7 is molded onto the plastic housing shell 2. In the pistol handle 7, a switch 8 with a pusher is installed, via which the hammer drill can be put into operation. At the lower end of the gun handle 7, a power supply cable 9 is inserted through an elastic grommet.
  • the gear housing 1 essentially consists of a transverse wall 10, in which a bearing seat 11 is arranged approximately in the center for a front bearing of an armature shaft 13 of an electric motor which is designed as a ball bearing 12.
  • the electric motor of which essentially only the front part of the armature shaft 13 is shown in the drawing, thus lies on the side of the transverse wall 10 of the transmission housing 1 facing away from the tool holder 5.
  • the transverse wall 10 carries a tubular extension 14 on the side facing away from the electric motor , in which a cylindrical sleeve 16 for an air cushion hammer mechanism 15 is arranged.
  • the extension 14 carries one at its front end facing the tool holder 5 Flange 17, which engages in a tubular fitting 18 in the interior of the housing shell 2, the gear housing 1 on its front.
  • the gear housing 1 is supported on the other side with the transverse wall 10 on the inner surface of the housing shell 2.
  • an O-ring 19 is inserted in an annular groove on the outer edge of the transverse wall 10 and touches the inner wall of the housing shell 2 with a slight prestress.
  • the transverse wall 10 is supported on stops 20 formed by thickening the wall of the housing shell 2.
  • the external spline toothing 25 is turned off in the area of the deep groove ball bearing 26, it is supported on the inner ring of the deep groove ball bearing 26 with the shoulder that arises.
  • the outer ring of the deep groove ball bearing 26 is held in a correspondingly designed receptacle 26 'which is molded onto the transverse wall 10 (FIG. 3).
  • the outer ring of the deep groove ball bearing 26 is supported on the base of the receptacle 26 'in such a way that from the intermediate shaft 24 transmitted axial forces can be introduced into the transverse wall 10.
  • a bore 27 is coaxially made, in which a spring 28 is arranged.
  • a shaft part 29 extends from the free end of the bore 27 and can be inserted telescopically against the force of the spring 28 into the bore 28.
  • the free end of the shaft part 29 is in turn held in a needle bearing 30. With its string side, the shaft part 29 is held axially by the spring 28 against a plate 32 arranged in the base of a bearing seat 31 for the needle bearing 30.
  • the bearing receptacle 31 is molded onto the housing shell 2, which may consist of a glass fiber reinforced plastic.
  • a hub body 33 of a swash plate drive for the air cushion hammer mechanism 15 is rotatably arranged on the intermediate shaft 24.
  • the hub body 33 On its outside, the hub body 33 has a single groove 34 for balls 35, which is closed in a ring-like manner and is inclined in one plane to the axis of the hub body 33.
  • the hub body 33 is connected to the intermediate shaft 24 so that it can be disengaged by means of positive coupling elements.
  • the outer spline teeth 25 of the intermediate shaft 24 serve as coupling elements, in which an annular inner spline teeth 36 engages in the bore of the hub body 33.
  • an undercut 37 is located axially on the side facing the deep groove ball bearing 26 next to the internal spline toothing 36, the axial width of which is greater than the width of the annular internal spline toothing 36 of the hub body 33.
  • the drive gear 23 On the end of the external spline toothing 25 facing the deep groove ball bearing 26, the drive gear 23 provided with a corresponding internal spline connection sits non-rotatably but axially displaceably on the intermediate shaft 24.
  • a tooth height which is reduced in relation to the tooth height in the remaining partial region of the intermediate shaft 24.
  • the transition 38 from the reduced to the undiminished tooth height forms an axial stop for the hub body 33 on its end face facing away from the drive gear 23.
  • the bore in the hub body 33 is adapted at least in the region of the ring-shaped internal spline teeth 36 to the reduced tooth height of the external teeth 25 of the intermediate shaft 24.
  • the hub body 33 is supported on the one hand with the annular internal spline 36 on the intermediate shaft 24.
  • the hub body 33 is supported on an axially projecting collar 39 of the drive gear 23.
  • the spring 28 In the position shown in FIG. 3, in which the coupling elements 25 (external spline teeth) of the intermediate shaft 24 are in engagement with the mating coupling elements 36 (internal spline teeth) of the hub body 33, the spring 28 ultimately braces the intermediate shaft with the axial stop (transition 38) against the hub body 33.
  • This is in turn supported axially on the drive gear 23, which rests on the inner ring of the deep groove ball bearing 26.
  • the external spline toothing 25 of the intermediate shaft 24 has the form of a toothing suitable for the transmission of rotary movements, in this case, for example, an involute toothing.
  • a toothing suitable for the transmission of rotary movements in this case, for example, an involute toothing.
  • the output pinion 40 of the intermediate shaft 24 can form the output pinion 40 of the intermediate shaft 24.
  • This output pinion 40 meshes with a gear 41, which ultimately sets the tool held in the tool holder 5 - the drill 6 - in rotation.
  • the hub body 33 In the position shown in FIG. 3, the hub body 33 is in the engaged position, in which it is set in rotation by the intermediate shaft 24.
  • the intermediate shaft In order to interrupt the rotary connection between the intermediate shaft 24 and the hub body 33, that is to say ultimately to put the air cushion hammer mechanism 15 out of operation, the intermediate shaft must be moved forward in the direction of the tool holder 5.
  • switching means that can be actuated from the outside have been arranged, which enable this disengagement of the striking mechanism.
  • These switching means are designed as eccentrics 42 on a switching shaft 43.
  • the selector shaft is guided in an associated bearing bore 44 which is formed in the transverse wall 10. In the operating position of the rotary hammer, the axis of the control shaft 43 and thus also the bearing bore 44 lie horizontally.
  • the selector shaft 43 carries an actuating button 45 '(FIGS. 2 and 3).
  • the switching eccentric 42 is designed in such a way that it does not touch the rear, spherical end 46 of the intermediate shaft 24 which projects from the deep groove ball bearing 26 in the position in which the striking mechanism is switched on. Only by turning the operating button 45 from the position shown in FIG. 3 by 180 ° does the outer surface of the control shaft 43 come into contact with the crowned end 46 of the intermediate shaft 24, so that it finally counteracts the force of the Spring 28 is moved forward.
  • the switching eccentric 42 is thus loaded by the spring 28 in the axial direction only when the air cushion percussion mechanism is switched off, in which no stresses are placed on the machine.
  • the switching eccentric 42 is completely relieved of the force of the spring 28.
  • the spring force is fully available to eliminate the axial play of the hub body 33. In this way, minimal noise is achieved on the one hand.
  • the elastic bracing of the hub body 33 against the housing of the hammer drill guarantees complete freedom from axial play - both due to manufacturing tolerances and the occurrence of wear.
  • the groove 34 on the hub body 33 is assigned an outer groove 49 cut into the inside of a ring 48, between which the balls 35 are guided. To keep the balls at a defined distance, are they are guided in a cage 50 known from ball bearings.
  • a wobble finger 51 which drives the air cushion hammer mechanism 15 of the rotary hammer back and forth, is integrally formed on the ring 48.
  • the hammer mechanism of the hammer drill is arranged in the interior of the fixed bushing 16 which is attached in the extension 14. It consists of a cup piston 52 which is tightly and slidably guided in the liner 16 and in the cylindrical bore 53 of which a club 54 designed as a free-flying piston is also arranged in a tight and sliding manner.
  • the rear end, facing away from the tool holder 5, of the pot piston 52 is fork-shaped and carries a pivot pin 55.
  • a transverse bore is arranged in the center of the pivot pin 55, in which the wobble finger 51 engages with little movement play. As a result, the wobble finger 51 can move slightly in the axial direction in the transverse bore.
  • an intermediate striker 56 extends into the front end region of the bore 53 facing away from the wobble finger 51.
  • the intermediate striker is guided in an axially movable manner in a support sleeve 57.
  • the intermediate striker touches with its front end in a manner known per se and therefore not shown in the drawing, the inner end of the drill 6 axially displaceable but non-rotatably held in the tool holder 5.
  • the support sleeve 57 is in turn fastened inside a rotary sleeve 58 which is rotatably guided in the housing extension 3 in a manner not shown.
  • the rear end of the rotary sleeve 58 is supported via an axial needle bearing 59 on the flange 17 of the extension 14 of the transverse wall 10.
  • the rotary sleeve is in its radial direction rear, facing the needle bearing 59 on the protruding from the extension 15 end of the bushing 16.
  • the gear 41 which meshes with the intermediate shaft 24, is rotatably guided on the cylindrical outer wall of the rotary sleeve 58.
  • the body of the gearwheel 41 which has clutch claws on its end face on the engine, is held in engagement with associated clutch claws on the rear flange 62 of the rotary sleeve 58 via a compression spring 61 which is supported on a snap ring 60 which is inserted into an associated groove of the rotary sleeve 58 .
  • the strength of the compression spring 61 is dimensioned such that the gear 41 is held in engagement with the rear flange of the rotary sleeve at normal drilling torques via the coupling claws.
  • the rotary connection between the gear 41 and the rotary sleeve 58 is only interrupted when a response torque is reached.
  • a rotary movement of the hub body 33 produces, as can be easily seen, a reciprocating movement of the pot piston 52.
  • the racket is also moved in an axial direction via the air cushion which forms between the piston 52 and the racket 54 and acts as an energy store. and moving around.
  • the striker 54 releases its energy, which finally acts as an axial stroke on the tool held in the tool holder 5.
  • the tool - the drill 6 - is set in rotation via the above-described safety coupling consisting of gear 41 and rear flange 62 of the rotating sleeve 58.
  • the striking mechanism By actuating the eccentric 42 arranged on the selector shaft 43, the striking mechanism can be put out of operation in the manner described above. Since the air cushion hammer mechanism is completely stationary in this case, an absolutely vibration-free run is achieved in impact stop mode, i.e. in drilling mode. It has been shown that the swash plate drive can be switched in any operating state of the rotary hammer.
  • the second exemplary embodiment of an intermediate shaft 24 shown in FIG. 5 differs from the first exemplary embodiment in that the tooth height of the external spline toothing 25 is of the same height over the entire length of the intermediate shaft 24.
  • the axial stop required for the axial displacement of the hub body 33 or for the axial bracing of the hub body 33 in the engaged state, which in the first embodiment is formed by the transition 38 from the reduced to the undiminished tooth height of the external spline toothing 25, is in this embodiment of at least one a recess of the intermediate shaft 24 inserted round ring 68 is formed.
  • the recess consists of parts of an annular groove cut into each tooth of the external spline toothing 24. Of course, if the annular groove were cut deeper, the recess could extend into the core of the intermediate shaft 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP81105591A 1980-10-21 1981-07-16 Perceuse à percussion Expired EP0050192B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3039669 1980-10-21
DE19803039669 DE3039669A1 (de) 1980-10-21 1980-10-21 Bohrhammer

Publications (3)

Publication Number Publication Date
EP0050192A1 true EP0050192A1 (fr) 1982-04-28
EP0050192B1 EP0050192B1 (fr) 1984-02-22
EP0050192B2 EP0050192B2 (fr) 1989-10-04

Family

ID=6114858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105591A Expired EP0050192B2 (fr) 1980-10-21 1981-07-16 Perceuse à percussion

Country Status (4)

Country Link
US (1) US4446931A (fr)
EP (1) EP0050192B2 (fr)
JP (1) JPS57102779A (fr)
DE (2) DE3039669A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0135654A1 (fr) * 1983-09-29 1985-04-03 Licentia Patent-Verwaltungs-GmbH Guidage du piston d'une perforatrice à coussin d'air
WO1989011955A1 (fr) * 1988-06-04 1989-12-14 Robert Bosch Gmbh Marteau perforateur
EP2767367A4 (fr) * 2012-12-11 2015-10-14 Zhejiang Benyu Tools Co Ltd Dispositif de commutation de transmission de marteau électrique

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3319934A1 (de) * 1982-06-02 1983-12-15 Black & Decker, Inc. (eine Gesellschaft n.d.Ges.d. Staates Delaware), 19711 Newark, Del. Schlagbohrmaschine
JPS5930607A (ja) * 1982-08-12 1984-02-18 Hitachi Koki Co Ltd 電気ハンマドリル
DE3322964A1 (de) * 1983-06-25 1985-01-24 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Schlagwerkzeug, insbesondere bohrhammer
DE3429140A1 (de) * 1984-08-08 1986-02-20 Black & Decker Inc., Newark, Del. Bohrhammer mit einem pneumatischen schlagwerk
DE3504650C2 (de) * 1985-02-12 1994-01-20 Bosch Gmbh Robert Bohrhammer mit Verstärkung der Betätigungskraft für die Kupplung des Schlagantriebes
DE3627869A1 (de) * 1986-08-16 1988-02-18 Bosch Gmbh Robert Schlagwerkabschaltung
NL8801466A (nl) * 1988-06-07 1990-01-02 Emerson Electric Co Inrichting voor het aandrijven van een boor- en/of slaggereedschap.
USRE35372E (en) * 1988-06-07 1996-11-05 S-B Power Tool Company Apparatus for driving a drilling or percussion tool
DE4013512A1 (de) * 1990-04-27 1991-10-31 Black & Decker Inc Schalteinrichtung zum umschalten eines kraftgetriebenen werkzeugs
US5447205A (en) * 1993-12-27 1995-09-05 Ryobi Motor Products Drill adjustment mechanism for a hammer drill
US5588496A (en) * 1994-07-14 1996-12-31 Milwaukee Electric Tool Corporation Slip clutch arrangement for power tool
DE19540391A1 (de) * 1995-10-30 1997-05-07 Hilti Ag Bohr- und Meisselgerät
DE19955412A1 (de) * 1999-11-18 2001-05-23 Hilti Ag Bohr- und Meisselgerät
DE10213093B4 (de) * 2002-03-23 2013-06-20 Andreas Stihl Ag & Co. Handbohrmaschine mit einem Verbrennungsmotor
GB2394437A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Hammer including a piston with wear-reducing washers
GB2394517A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Powered hammer having a spindle lock with synchronising element
JP3976187B2 (ja) * 2002-11-20 2007-09-12 株式会社マキタ ハンマードリル
DE602004026665D1 (de) * 2003-08-06 2010-06-02 Hitachi Koki Kk Schlagbohrer
DE102004012820B3 (de) * 2004-03-16 2005-11-17 Wacker Construction Equipment Ag Taumelfingergetriebe
DE102004025951A1 (de) * 2004-05-27 2005-12-22 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
DE102004026845A1 (de) * 2004-06-02 2005-12-22 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
DE102004034268B3 (de) * 2004-07-15 2005-12-29 Wacker Construction Equipment Ag Bohrhammer mit Sicherheitskupplung
DE102004058686A1 (de) * 2004-09-03 2006-03-09 Robert Bosch Gmbh Elektrowerkzeug mit einem zwischen den Betriebsarten Bohren, Schlagbohren, Meißeln umschaltbaren Antrieb
DE102004044499B4 (de) * 2004-09-15 2021-02-18 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
DE102005019196A1 (de) * 2005-04-25 2006-10-26 Hilti Ag Handwerkzeuggerät mit Taumeleinrichtung
DE102005041447A1 (de) * 2005-08-31 2007-03-01 Robert Bosch Gmbh Bohrhammer
DE102005041448A1 (de) * 2005-08-31 2007-03-01 Robert Bosch Gmbh Handbohrmaschine mit Schaltgetriebe
DE102005047353A1 (de) * 2005-10-04 2007-04-05 Robert Bosch Gmbh Elektrowerkzeugmaschine
DE102005047600A1 (de) * 2005-10-05 2007-04-12 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Welle und mit einem auf der Welle gelagerten Hubantriebslager
JP4981506B2 (ja) * 2007-04-12 2012-07-25 株式会社マキタ ハンマードリル
US7806201B2 (en) * 2007-07-24 2010-10-05 Makita Corporation Power tool with dynamic vibration damping
DE112009001141T5 (de) * 2008-05-07 2011-06-09 Milwaukee Electric Tool Corp., Brookfield Antriebsanordnung für ein Kraftwerkzeug
US20110194796A1 (en) * 2010-02-05 2011-08-11 Schaeffler Technologies Gmbh & Co. Kg Angled Bore Bearing
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
JP5512441B2 (ja) * 2010-07-22 2014-06-04 株式会社マキタ ねじ締め工具
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
CN104994997B (zh) * 2013-03-26 2017-10-10 日立工机株式会社 电动工具
JP6325360B2 (ja) * 2014-06-12 2018-05-16 株式会社マキタ 打撃工具
JP6479570B2 (ja) * 2015-05-19 2019-03-06 株式会社マキタ 作業工具

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DE1948055A1 (de) * 1969-09-23 1971-04-01 Impex Essen Vertrieb Elektrisch betriebener Bohrhammer
DE2242944A1 (de) * 1972-08-31 1974-03-14 Bosch Gmbh Robert Bohrhammer
DE1938660B2 (de) * 1969-07-30 1974-10-03 Metabowerke Kg, Closs, Rauch & Schnizler, 7440 Nuertingen Schlagbohrhammer
DE2449191A1 (de) * 1974-10-16 1976-05-06 Bosch Gmbh Robert Handwerkzeugmaschine

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US2385439A (en) * 1943-08-27 1945-09-25 Gubbins Charles Henry Mechanical hammer
US2824455A (en) * 1952-06-27 1958-02-25 Milwaukee Electric Tool Corp Portable reciprocating saw
US3399441A (en) * 1965-12-13 1968-09-03 Imamura Yukio High speed recoilless chisel device
BE793096A (fr) * 1971-12-23 1973-06-20 Caterpillar Tractor Co Agencement de frein de parcage avec decouplage du dispositif d'entrainement hydrostatique final pour un chargeur
US4158970A (en) * 1977-06-15 1979-06-26 Black & Decker Inc. Override arrangement and actuating knob for a shifting mechanism in portable tools
DE2820128A1 (de) * 1978-05-09 1979-11-22 Bosch Gmbh Robert Handwerkzeugmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1938660B2 (de) * 1969-07-30 1974-10-03 Metabowerke Kg, Closs, Rauch & Schnizler, 7440 Nuertingen Schlagbohrhammer
DE1948055A1 (de) * 1969-09-23 1971-04-01 Impex Essen Vertrieb Elektrisch betriebener Bohrhammer
DE2242944A1 (de) * 1972-08-31 1974-03-14 Bosch Gmbh Robert Bohrhammer
DE2449191A1 (de) * 1974-10-16 1976-05-06 Bosch Gmbh Robert Handwerkzeugmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0135654A1 (fr) * 1983-09-29 1985-04-03 Licentia Patent-Verwaltungs-GmbH Guidage du piston d'une perforatrice à coussin d'air
WO1989011955A1 (fr) * 1988-06-04 1989-12-14 Robert Bosch Gmbh Marteau perforateur
EP2767367A4 (fr) * 2012-12-11 2015-10-14 Zhejiang Benyu Tools Co Ltd Dispositif de commutation de transmission de marteau électrique

Also Published As

Publication number Publication date
EP0050192B2 (fr) 1989-10-04
JPS57102779A (en) 1982-06-25
DE3162371D1 (en) 1984-03-29
DE3039669A1 (de) 1982-05-27
JPS6351828B2 (fr) 1988-10-17
EP0050192B1 (fr) 1984-02-22
US4446931A (en) 1984-05-08

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