US3777825A - Hammer drilling machine - Google Patents

Hammer drilling machine Download PDF

Info

Publication number
US3777825A
US3777825A US00269774A US3777825DA US3777825A US 3777825 A US3777825 A US 3777825A US 00269774 A US00269774 A US 00269774A US 3777825D A US3777825D A US 3777825DA US 3777825 A US3777825 A US 3777825A
Authority
US
United States
Prior art keywords
drilling
plunger
hammer
spindle
machine 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
US00269774A
Other languages
English (en)
Inventor
R Gullich
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.)
Impex Essen Vertrieb von Werkzeugen GmbH
Original Assignee
Impex Essen Vertrieb von Werkzeugen 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 Impex Essen Vertrieb von Werkzeugen GmbH filed Critical Impex Essen Vertrieb von Werkzeugen GmbH
Application granted granted Critical
Publication of US3777825A publication Critical patent/US3777825A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • B25D2211/062—Cam-actuated impulse-driving mechanisms
    • B25D2211/064—Axial cams, e.g. two camming surfaces coaxial with drill spindle

Definitions

  • ABSTRACT PP N04 269,774 A hammer drilling machine selectively switchable between pure drilling and hammer drilling modes oper- [301 Foreign Application Priority Dan ates with reduced frictional heat due to the construc- Se l 4 971 G P21444495 tion of the percussion mechanism. During hammer p many drilling there is no relative rotation between the plunger and the drilling spindle.
  • the percussion mechg 1.73/13 gg anism includes two co-operable cam members, both of [58] Ficid 48 which are stationary when the machine is idling, and one of which is connected to the plunger and is set into rotation with the machine in the hammer drilling [56'] g giig g gr mode by axial displacement of the drilling spindle. 3,395,765 8/1968 Schnettler 173/13 10 Claims, 2 Drawing Figures 15 O g I new a 3 I2 a Z H 1 if, i 7? l 1, 5
  • HAMMER DRILLING MACHINE BACKGROUND TO THE INVENTION This invention relates to a hammer drilling machine comprising gearing which can be switched between drilling and hammer drilling modes of operation, a drilling spindle which is mounted for limited axial displacement, and a percussion mechanism arranged symmetrically about the drilling spindle, the percussion mechanism comprising a plunger which is subject to the action of spring means and is axially displaceable relative to the drilling spindle, and two co-operable cam members, one of which is connected to the plunger.
  • a plunger is axially oscillatable directly on an axially movable drilling spindle under the effect of the force of a spring, in such a way that a cam ring or toothed disc rigidly screwed to the plunger co-operates with a cam ring or toothed disc of the drilling spindle.
  • the latter is displaced on setting the machine against the stone or on feeding axially in the direction of the interior of the gear housing, so that coupling teeth on the plunger are brought into engagement with coupling teeth fixedly arranged in the housing and the plunger is secured against rotation.
  • the toothed discs and springs thereby allow the plunger to hammer upon the drilling spindle with a predetermined rhythm.
  • the spring acts so that the toothed discs perform no rotation relative to one another and the plunger is then rotated together with the drilling spindle.
  • This co-rotation of the plunger and the toothed discs coupling it to the drilling spindle also takes place during pure drilling with the drill, in which mode the axial movement of the drilling spindle is blocked.
  • the primary disadvantage of this known machine is that in the hammer drilling mode which loads the machine to the greatest degree, additional frictional heat is produced by the drilling spindle rotating in the plunger and behaving as a guide for it at the same time.
  • a hammer drilling machine comprising gearing which can be switched selectively between drilling and hammer drilling modes of operation, a drilling spindle which is mounted for limited axial displacement, and a percussion mechanism arranged symmetrically about the drilling spindle, said percussion mechanism comprising a plunger which is subject to the action of spring means and is axially displaceable relative to the drilling spindle, and two co-operable cam members, one of which is connected to the plunger, wherein both cam members remain stationary when the machine is idling and wherein said cam member connected to the plunger is arranged to be set into rotation with the machine in the hammer drilling mode by axial displacement of the drilling spindle.
  • both cam members remain still on idling and that when operating in the hammer drilling mode only the cam member connected to the plunger is rotated upon setting the machine against the stone or on advancing the machine.
  • the power capacity of the driving motor can also be reduced, since when idling, when operating in the hammer drilling mode, and during pure rotational drilling,
  • the plunger does not need to be enclosed or to be correspondingly accelerated.
  • said cam member connected to the plunger - is coupled to the drilling spindle with the machine in the hammer drilling mode through the plunger.
  • the other cam member cooperating with this cam member can therefore be fixedly arranged so that the construction of the percussion gearing is very simple.
  • the plunger is arranged to be axially displaceable but non-rotatable on a coupling sleeve which is mounted for rotation and limited axial movement on the drilling spindle, said sleeve having at its one end coupling means for engagement with coupling means on the drilling spindle and supporting at its other end said spring means which is arranged to be stressed by axial movement of the plunger.
  • the coupling sleeve thus carries the oscillatable plunger, so that the sliding friction originating from the oscillatory movement is transferred to the coupling sleeve and does not have an effect on the upper surface of the drilling spindle, as is the case with the known hammer drilling machines. Sliding friction forces between the drilling spindle and the coupling sleeve only occur when the latter is stationary during idling in the hammer drilling mode or during pure drilling operations.
  • the plunger spring means effecting the hammering movements of the plunger in conjunction with the cam members is supported by the coupling sleeve in such a way that, in addition to the sliding friction originating from the oscillation of the plunger, no further sliding friction arises due to the springmeans, but on the contrary the sliding friction in the hammer drilling mode rather remains limited to the sliding surfaces guiding the plunger and the bearings supporting the drilling spindle, apart from the sliding friction of the cam members.
  • the drilling spindle preferably includes a striker plate which carries the drilling spindle coupling means and transfers the hammer blows of the plunger to the spindle; This means that with heavy loadings the striker plate may be changed without renewal of the drilling spindle also being necessary at the same time.
  • the other said cam member is preferably carried by a lock nut connected into a housing for the precussion mechanism.
  • the cam member and lock nut may be formed as one part, and the additional expense of fitting a separate cam member is then not necessary.
  • the drilling spindle is preferably mounted in two roller bearings, the inner race ring of the motor-side roller bearing supporting the rotatable coupling sleeve of the drilling spindle in the hammer drilling mode against the force of the plunger sping means. In this way the axial forces arising when operating in the hammer drilling mode can be transferred 'in a simple way through the coupling sleeve to the inner race ring of this roller bearing.
  • the percussion gearing is fitted as a built-up unit into the gear housing and is preferably screwed into the housing.
  • the end of the drilling spindle to which the rotary driving force is imparted carries an axially displaceable driving gear wheel which preferably has an inclined tooth periphery urging it in the feed direction.
  • FIG. 1 is a longitudinal sectional view through the whole gear system of the hammer drilling machine
  • FIG. 2 is a schematic sketch illustrating the principle of the percussion gearing.
  • the percussion mechanism of the hammer drilling machine consists essentially of components grouped symmetrically about a drilling'spindle B. These components comprise a first cam ring N, an opposing cam ring G rigidly connected to a plunger 5, and a spring F which throws the plunger S against a stroker plate T by the 'action of the spreading of the two cam rings on rotation of the one relative to the other, e.g. by relative rotation of two sets of ratchet teeth sliding on one another, stressing the spring, whereafter the closing of the cam rings'upon further relative rotation causes the spring to be unloaded and the plunger to be thrown forward.
  • the drilling spindle l in FIG. 1 is so mounted, as indicated by the arrows of movement, that it is both rotatable as well as displaceable to a limited degree in an axial direction. It is supported by two roller bearings 7, 8, the first of which is arranged in an end lock nut 18 of the gear housing 12 and the second of which is arranged in a gear housing flange separating the percussion gearing from the rotary gearing.
  • the axial movement of the drilling spindle 1 can be blocked by means,
  • a control pin 15 which is rotatably mounted in the machine housing in such a way that a ball 16 positioned at the end of the drilling spindle can be pressed by the pin against the drilling spindle counter to the force of a spring 6 seated in the spindle.
  • the rotation of the drilling spindle is effected through a motor drive shaft 20 which drives a gear wheel 13 and thence a rotatably mounted counter shaft 10, the latter driving a toothed gear wheel 9 which is axially displaceable on the drilling spindle.
  • the inclined teeth 14 of the gear wheel 9 ensure that on turning the drilling spindle in a clockwise direction the gear wheel runs constantly in the I feed direction against the inner roller bearing 8.
  • the drilling spindle 1 carries a striker plate 5 adjacent to the outer roller bearing 7.
  • This striker plate is rigidly connected to the drilling spindle and is provided with coupling teeth 5' on its axially inner face.
  • a coupling sleeve 1 l is rotatably arranged on the drilling spindle and co-axial therewith, the sleeve 11 having coupling teeth 11' at its outer end adjacent to the coupling teeth 5'.
  • This coupling sleeve 11 supports in a non-rotatable but axially displaceable manner a plunger 3 and a plunger spring 4.
  • the latter presses at one end against a circlip or snap ring 21 of the coupling sleeve 11 adjacent to the inner roller bearing 8, and at the other end against the plunger 3, which at its end remote from the spring 4 has a counter-pressur cam ring 3 non-rotatably connected to it.
  • This counter-pressure cam ring 3' engages with axial play A with a further cam ring 2 which is supported by the lock nut 18.
  • the cam rings are preferably formed integrally with the components which support them or are machined directly from them. The construction then works well with just two roller bearings in spite of the movable parts of the percussion gearing.
  • the axial play A is always guaranteed, in order to avoid unnecessary friction, by virtue of the fact that the spring 4 is supported at its two ends directly or indirectly via the seating ring 21 for absorbing the. forces on the coupling sleeve 11.
  • the drilling spindle l is displaced axially into the inside of the gear housing 12 counter to the force of the spring 6 as a result of setting the drilling tool against the stone to be drilled, so that the drilling spindle teeth 5' come into engagement with the teeth 11' on the coupling sleeve 11 and drive them.
  • the plunger 3 is also set into rotation and the cam ring 3' which is rigidly connected to it turns relative to the fixed cam ring 2.
  • the plunger 3 is axially displaced counter to the force of the spring 4 and thereafter is thrown against the striker plate 5 of the drilling spindle, as the crests of the cam ring disc 3' first displace the plunger axially as far as possible and then fall into the valleys between the crests of the cam ring disc 2.
  • the plunger 3 transfers the energy given to it by the spring 4 to the striker plate 5, and thus to the drilling spindle l which passes this energy to the drilling tool.
  • the driving gear wheel 9 is axially displaceably mounted on the motor-side end of the drilling spindle. Since as a result the mass of the gear wheel does not need to be accelerated as well as the mass of the drilling spindle by the plunger, the plunger can be kept smaller while achieving the same impact force on a drilling tol. Besides this, the whole machine can be made shorter in respect of the drilling spindle stroke H, since the driving gear wheel 9 runs constantly in the feed direction of the machine against the inner race ring of the roller bearing 8. A short-period running of the gear wheel 9 on the gear wheel 13 when set for hammer drilling, that is with the drilling tool set against the stone to be drilled, does not cause trouble and is immediately eliminated by the inclined tooth arrange-.
  • control pin 15 is turned when the machine is switched off or when it is idling so that the spindle ball 16 is pressed against the small pressure of the spring 6 into the drilling spindle at the end adjacent to the roller bearing 8, so that, on drilling, the spindle is supported by the control pin 15.
  • the coupling teeth 5' and 11 then remain out of engagement, so that the percussion mechanism does not operate.
  • a hammer drilling machine comprising gearing which can be switched selectively between drilling and hammer drilling modes of operation, a drilling spindle which is mounted for limited axial displacement, and a percussion mechanism arranged symmetrically about the drilling spindle, said percussion mechanism comprising a plunger which is subject to the action of spring means and is axially displaceable relative to the drilling spindle, and two co-operable cam members, one of which is connected to the plunger, wherein both cam members remain stationary when the machine is idling and wherein said cam member connected to the plunger is arranged to be set into rotation with the machine in the hammer drilling mode by axial displacement of the drilling spindle.
  • a hammer drilling machine in which the other of the cam members is permanently fixed in position and is machined into a lock nut conin which said one cam member is machined directly from the plunger.
  • a hammer drilling machine in which the plunger is arranged to be axially displaceable but non-rotatable ,on a coupling sleeve which is mounted for rotation and limited axial movement on the drilling spindle, said sleeve having at its one end coupling means for engagement with coupling means on the drilling spindle and supporting at its other end said spring means which is arranged to be stressed by axial movement of the plunger.
  • a hammer drilling machine in which the coupling sleeve is provided at its said other end with an annular supporting member for said spring means.
  • a hammer drilling machine in which the coupling sleeve is supported with the machine in the hammer drilling mode by an inner ring of a driving-end drilling spindle roller bearing against the force of said spring means.
  • a hammer drilling machine in which a striker plate transmitting the hammer blows of the plunger to the drilling spindle carries said coupling means on the drilling spindle which is engageable with said coupling means on the sleeve.
  • a hammer drilling machine in which the end of the drilling spindle to which the rotary driving force is imparted carries an axially displaceable driving gear wheel.
  • a hammer drilling machine in which the driving gear wheel has an inclined tooth periphery urging it in the feed direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)
US00269774A 1971-09-04 1972-07-07 Hammer drilling machine Expired - Lifetime US3777825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2144449A DE2144449A1 (de) 1971-09-04 1971-09-04 Hammerbohrmaschine

Publications (1)

Publication Number Publication Date
US3777825A true US3777825A (en) 1973-12-11

Family

ID=5818723

Family Applications (1)

Application Number Title Priority Date Filing Date
US00269774A Expired - Lifetime US3777825A (en) 1971-09-04 1972-07-07 Hammer drilling machine

Country Status (6)

Country Link
US (1) US3777825A (fr)
AT (1) AT315053B (fr)
DE (1) DE2144449A1 (fr)
FR (1) FR2151891A5 (fr)
GB (1) GB1388735A (fr)
IT (1) IT962568B (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073348A (en) * 1975-07-25 1978-02-14 Robert Bosch Gmbh Impact drilling tool
US4232749A (en) * 1977-10-22 1980-11-11 Robert Bosch Gmbh Convertible rotary/percussion drill
US4506743A (en) * 1981-11-13 1985-03-26 Black & Decker Inc. Latching arrangement for power tools
US5494115A (en) * 1994-10-25 1996-02-27 Hwong; Steven Electric hammer drill
EP1050381A2 (fr) 1999-04-30 2000-11-08 Matsushita Electric Works, Ltd. Outil à chocs rotatif
US20050194164A1 (en) * 2004-03-05 2005-09-08 Hitachi Koki Co., Ltd. Impact drill
US20060213675A1 (en) * 2005-03-24 2006-09-28 Whitmire Jason P Combination drill
US20070181319A1 (en) * 2005-09-13 2007-08-09 Whitmine Jason P Impact rotary tool with drill mode
EP1871954A2 (fr) * 2005-04-19 2008-01-02 BLACK & DECKER INC. Structures de retenue a palier externe pour mecanisme a marteau a cremaillere
US7717192B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode drill with mode collar
US7717191B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode hammer drill with shift lock
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US7762349B2 (en) 2007-11-21 2010-07-27 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US7770660B2 (en) 2007-11-21 2010-08-10 Black & Decker Inc. Mid-handle drill construction and assembly process
US7798245B2 (en) 2007-11-21 2010-09-21 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US7854274B2 (en) 2007-11-21 2010-12-21 Black & Decker Inc. Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing
US20120111594A1 (en) * 2009-06-26 2012-05-10 Tobias Herr Hand-held power tool
US20130270051A1 (en) * 2010-10-15 2013-10-17 Robert Bosch Gmbh Hand-held electric tool having a spindle-locking device
US20160129577A1 (en) * 2009-07-03 2016-05-12 Robert Bosch Gmbh Hand-held power tool
US20160362864A1 (en) * 2014-02-28 2016-12-15 Krinner Innovation Gmbh Method and apparatus for driving screwable foundations into the ground
US11008725B2 (en) * 2018-06-14 2021-05-18 Krinner Innovation Gmbh Driving device with impact effect

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3213672C2 (de) * 1982-04-14 1984-07-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Stellglied zum Umschalten einer Hammerbohrmaschine mit einem durch einen Taumelscheibenantrieb betätigbaren pneumatischen Schlagwerk vom Betriebszustand "Bohren" in den Betriebszustand "Hammerbohren"
JPS5969808U (ja) * 1982-09-07 1984-05-11 株式会社マキタ 震動ドリルにおける震動装置
JPS5950617U (ja) * 1982-09-25 1984-04-03 日立工機株式会社 振動ドリル機
JPS59173507U (ja) * 1983-05-09 1984-11-20 芝浦メカトロニクス株式会社 振動ドリル
NL8304043A (nl) * 1983-11-24 1985-06-17 Skil Nederland Nv Inrichting voor het aandrijven van een boor- en/of slaggereedschap.
JPS6224979A (ja) * 1985-07-25 1987-02-02 松下電工株式会社 振動ドリル
ES2936520T3 (es) * 2019-09-12 2023-03-17 Krinner Innovation Gmbh Dispositivo de atornillado con efecto de impacto

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395765A (en) * 1966-12-19 1968-08-06 Milwaukee Electric Tool Corp Small rotary hammer
US3680642A (en) * 1969-11-14 1972-08-01 Bosch Gmbh Robert Variable speed percussion drilling machine
US3693728A (en) * 1969-11-15 1972-09-26 Reinhold Stroezel Percussion and rotary drilling machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395765A (en) * 1966-12-19 1968-08-06 Milwaukee Electric Tool Corp Small rotary hammer
US3680642A (en) * 1969-11-14 1972-08-01 Bosch Gmbh Robert Variable speed percussion drilling machine
US3693728A (en) * 1969-11-15 1972-09-26 Reinhold Stroezel Percussion and rotary drilling machine

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073348A (en) * 1975-07-25 1978-02-14 Robert Bosch Gmbh Impact drilling tool
US4232749A (en) * 1977-10-22 1980-11-11 Robert Bosch Gmbh Convertible rotary/percussion drill
US4506743A (en) * 1981-11-13 1985-03-26 Black & Decker Inc. Latching arrangement for power tools
US5494115A (en) * 1994-10-25 1996-02-27 Hwong; Steven Electric hammer drill
EP1050381A2 (fr) 1999-04-30 2000-11-08 Matsushita Electric Works, Ltd. Outil à chocs rotatif
US6457535B1 (en) * 1999-04-30 2002-10-01 Matsushita Electric Works, Ltd. Impact rotary tool
EP1050381A3 (fr) * 1999-04-30 2003-04-16 Matsushita Electric Works, Ltd. Outil à chocs rotatif
US7073605B2 (en) * 2004-03-05 2006-07-11 Hitachi Koki Co., Ltd. Impact drill
US20050194164A1 (en) * 2004-03-05 2005-09-08 Hitachi Koki Co., Ltd. Impact drill
US20060213675A1 (en) * 2005-03-24 2006-09-28 Whitmire Jason P Combination drill
EP1871954A2 (fr) * 2005-04-19 2008-01-02 BLACK & DECKER INC. Structures de retenue a palier externe pour mecanisme a marteau a cremaillere
EP1871954A4 (fr) * 2005-04-19 2015-01-07 Black & Decker Inc Structures de retenue a palier externe pour mecanisme a marteau a cremaillere
US20070181319A1 (en) * 2005-09-13 2007-08-09 Whitmine Jason P Impact rotary tool with drill mode
US7410007B2 (en) 2005-09-13 2008-08-12 Eastway Fair Company Limited Impact rotary tool with drill mode
US8122971B2 (en) 2005-09-13 2012-02-28 Techtronic Power Tools Technology Limited Impact rotary tool with drill mode
US20110011606A1 (en) * 2005-09-13 2011-01-20 Whitmire Jason P Impact rotary tool with drill mode
US7798245B2 (en) 2007-11-21 2010-09-21 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US8292001B2 (en) 2007-11-21 2012-10-23 Black & Decker Inc. Multi-mode drill with an electronic switching arrangement
US7762349B2 (en) 2007-11-21 2010-07-27 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US7854274B2 (en) 2007-11-21 2010-12-21 Black & Decker Inc. Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US7987920B2 (en) 2007-11-21 2011-08-02 Black & Decker Inc. Multi-mode drill with mode collar
US8109343B2 (en) 2007-11-21 2012-02-07 Black & Decker Inc. Multi-mode drill with mode collar
US7717191B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode hammer drill with shift lock
US7717192B2 (en) 2007-11-21 2010-05-18 Black & Decker Inc. Multi-mode drill with mode collar
US7770660B2 (en) 2007-11-21 2010-08-10 Black & Decker Inc. Mid-handle drill construction and assembly process
US8555998B2 (en) 2007-11-21 2013-10-15 Black & Decker Inc. Multi-mode drill with mode collar
US20120111594A1 (en) * 2009-06-26 2012-05-10 Tobias Herr Hand-held power tool
US9421679B2 (en) * 2009-06-26 2016-08-23 Robert Bosch Gmbh Hand-held power tool
US20160129577A1 (en) * 2009-07-03 2016-05-12 Robert Bosch Gmbh Hand-held power tool
US10183391B2 (en) * 2009-07-03 2019-01-22 Robert Bosch Gmbh Hand-held power tool
US20130270051A1 (en) * 2010-10-15 2013-10-17 Robert Bosch Gmbh Hand-held electric tool having a spindle-locking device
US9724816B2 (en) * 2010-10-15 2017-08-08 Robert Bosch Gmbh Hand-held electric tool having a spindle-locking device
US20160362864A1 (en) * 2014-02-28 2016-12-15 Krinner Innovation Gmbh Method and apparatus for driving screwable foundations into the ground
US9976275B2 (en) * 2014-02-28 2018-05-22 Krinner Innovation Gmbh Method and apparatus for driving screwable foundations into the ground
US11008725B2 (en) * 2018-06-14 2021-05-18 Krinner Innovation Gmbh Driving device with impact effect

Also Published As

Publication number Publication date
GB1388735A (en) 1975-03-26
DE2144449A1 (de) 1973-03-08
AT315053B (de) 1974-05-10
FR2151891A5 (fr) 1973-04-20
IT962568B (it) 1973-12-31

Similar Documents

Publication Publication Date Title
US3777825A (en) Hammer drilling machine
US4537264A (en) Power-driven hand tool
US4529044A (en) Electropneumatic hammer drill or chipping hammer
US3685594A (en) Rotary hammer or the like
US5113951A (en) Apparatus for driving a drilling or percussion tool
US4284148A (en) Portable hammer drill with rotating tool
US4732218A (en) Hammer drill with separate and interconnectable drive means
RU2416509C2 (ru) Механизированный инструмент
US6196330B1 (en) Manually operable drilling tool with dual impacting function
JPH04506036A (ja) 衝撃装置駆動部内にクラッチを有するドリルハンマまたは衝撃ハンマ
US4431062A (en) Rotating drive for impact hammer
US3507337A (en) Function switching arrangement for electro-pneumatic hammer drills
US3794124A (en) Electrically operated hammer drill
US2684738A (en) Rotary impact tool
GB1342745A (fr)
JP2703637B2 (ja) ドリルハンマ
US4712625A (en) Drilling and percussion hammer
US3334694A (en) Rotary hammer
US3269466A (en) Impact tool
JPS6319314B2 (fr)
GB1600944A (en) Percusiive hand tool
USRE35372E (en) Apparatus for driving a drilling or percussion tool
US3892107A (en) Device for transferring torque from a drill-sleeve to a drill-tool
US3006202A (en) Rotary and percussive tool
US3270821A (en) Power tool