US3834468A - Hammer-drill - Google Patents

Hammer-drill Download PDF

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Publication number
US3834468A
US3834468A US00243939A US24393972A US3834468A US 3834468 A US3834468 A US 3834468A US 00243939 A US00243939 A US 00243939A US 24393972 A US24393972 A US 24393972A US 3834468 A US3834468 A US 3834468A
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United States
Prior art keywords
projections
tool spindle
additional element
drill
axis
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Expired - Lifetime
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US00243939A
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English (en)
Inventor
A Hettich
R Stroezel
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/23—Cutting by use of rotating axially moving tool including means to cause Tool to progressively vibrate toward work

Definitions

  • the present invention relates generally to a tool, and more particularly to a manually held tool. Still more particularly, the invention relates to a manually held hammer-drill.
  • Hammer-drills are already known and need not be described in detail, except to point out that contrary to conventional drills they are so arranged that when it is desired by an operator, they can be employed to transmit to the tool spindle which carries the tool (that is the drill) longitudinally acting impacts.
  • the drill not only rotates but also is subjected to impact blows which are, of course, transmitted to the material in which the device is used for drilling.
  • the known hammer drills are so constructed that they will transmit to the tool spindle a fixed number of impacts per revolution of the spindle. It was originally thought that this was acceptable but it has since been found that such constructions have certain disadvantages. In particular, if drills of different diameters are utilized, such difficulties will arise. This is due to the fact that the number of impacts per revolution is predetermined by the manufacturer with respect to the use of a drill having a median diameter, that is having a diameter which is substantially midway between the largest-diameter and the smallestdiameter with which the hammer drill can be used.
  • a further disadvantage of the prior-art hammer drills is the fact that their efficiency is reduced due to the impossibility of considering the hardness or other characteristic of the material in which a bore hole is to be produced, when the number of impacts per complete revolution is determined and fixed by the manufacturer.
  • An additional object of the invention is to provide such a hammer-drill in which the number of impacts transmitted to the drill bit during each complete revolution thereof, can be accommodated to the diameter of the drill bit and to characteristics of the material in which a bore hole is to be formed.
  • a manually held hammer-drill which, briefly stated, comprises housing means and drive means located in the housing means and having a rotary output shaft.
  • Tool spindle means is journalled in the housing means and extends in part out of the same.
  • Coupling means couples the spindle means with the output shaft for rotation by the latter.
  • Impact means is provided for transmitting to the tool Spindle means a predetermined number of longitudinally acting impacts per revolution of the tool spindle means, and in accordance with the present invention there is provided varying means for varying this number of impacts at the will of an operator.
  • the drill according to the present invention achieves the basic purpose of providing improvements which avoid the disadvantages of the prior art.
  • FIG. 1 is a fragmentary vertical longitudinal section through a hammer-drill according to one embodiment of the invention
  • FIG. 2 is a top plan view of FIG. 1;
  • FIG. 3 is a view similar to FIG. 1 but illustrating a further embodiment of the invention.
  • FIG. 4 is a section taken on line lV-IV of FIG. 3;
  • FIG. 5 is an elevational view of two cooperating components used in the embodiments of FIGS. 1 and 3, as seen in the direction of the arrows in these Figures;
  • FIG. 6 is a view similar to FIG. 3 illustrating an additional embodiment of the invention.
  • FIG. 7 is an elevational view of FIG. 6
  • FIG. 8 is a section taken on line VIIIVIII of FIG. 6;
  • FIG. 9 is a side-elevational view of a component in the embodiment of FIGS. 6 8;
  • FIG. is an end-elevational view of a detail of the embodiment in FIGS. 6 8;
  • FIG. 1 l is a view similar to FIG. 10 illustrating a further detail
  • FIG. 12 is a view similar to FIG. 11 illustrating another detail
  • FIG. 13 is a view similar to FIG. 3 of yet another embodiment of the invention.
  • FIG. 14 is a top plan view of FIG. 13.
  • FIG. is a section taken on line XV-XV of FIG. 13.
  • tool side will be used herein to designate that end of the hammer-drill where a tool is secured to the portion of the tool spindle which extends out of the housing of the drill; conversely, the term operators side refers to the opposite end, that is the end (which is not specifically illustrated in the Figures) where the hammerdrill is provided with a conventional grip which is engaged by the hands of an operator. It is thought that this defintion of terminology will facilitate the description.
  • FIGS. 1 and 2 it will be seen that there has been fragmentarily shown a hammer-drill according to one embodiment of the invention, only the actual motor which preferably but not necessarily is an electrically operated motor and the hand-grip to be engaged by the hands of an operator, having been omitted.
  • the drill has a housing 1,3 of which the housing portion 1 is fragmentarily shown and should be understood to accommodate in known manner the motor.
  • the housing portion 3 accommodates the gearing of the drill and is separated from the housing portion 1 by a divider 2.
  • the motor has in conventional manner an output shaft 4 which is fragmentarily shown and which should be understood as being representative of the drive means; the output shaft 4 carries an insulating sleeve 5, for instance of synthetic plastic material, and press-fitted on this sleeve 5 is a stub shaft 6.
  • the end of the stub shaft 6 which faces the tool side is provided with a pinion 7 which may be formed of one-piece with the stub shaft 6 as shown, and which is journalled in the divider wall 2 by means of the anti-friction bearing 8.
  • the pinion 7 drives gears 10 and 11 which surround a shaft 9 and are retained against axial displacement relative to the housing 1,2,3 by the retaining rings 10' and 1], respectively.
  • the shaft 9 itself is provided at the tool side with an annulus of teeth 12 which mesh with the teeth of the gear 13, which is fixed on a further shaft 14 constituting the tool spindle.
  • Shaft 9 is journalled at its opposite ends in sleeve bearings 15 and 16 so that it can shift axially; it is of course also rotatable.
  • FIG. 1 shows clearly, the inner surfaces bounding the bores in the gears 10 and 11 through which the shaft 9 extends, are provided with a plurality of angularly spaced axially extending parallel grooves 17, and the shaft 9 is provided with a transverse passage or bore 18 in which there are located two ball members (preferably of steel) 19 which are pressed outwardly away from one another by an expansion spring 20.
  • the two ball members 19 attempt to enter into a pair of diametrally opposite grooves 17 of the gear 10 or 11, respectively.
  • the arrangement has the purpose of permitting either the gear IO or the gear 11 to be coupled for rotation with the shaft 9, and in the region of its end facing the operators side the shaft 9 is provided with an outer circumferentially extending annular groove 21, into which a non-illustrated displacing member en gages.
  • This displacing member which structurally and in its operational effectiveness is known per se, can shift the shaft 9 toward the left or towards the right in FIG. 1, so that the ball members 19 engage in the grooves of either the gear 11 as shown, or in the grooves 17 of the gear 10 if the shaft 9 is shifted towards the right in FIG. 1.
  • gears 10 and 11 are of differential size it is thus possible to drive the shaft 9 at different rotational speeds, and thereby to drive the tool spindle 14 also at different rotational speeds, inasmuch as it has motion transmitted to it via the teeth 12 and the gear 13.
  • the tool spindle 14 is journalled in a sleeve 23 of a sleeve bearing 24 which is mounted in the housing portion 3; similarly, at the operators side the spindle 14 is journalled in a sleeve bearing 22 in the intermediate wall 2.
  • the sleeve bearing 22 can shift axially in the intermediate wall 2, being in abutment at the operators side with a member 25 of quadratic cross-section (the cross-section in a plane normal to the plane of FIG. 1) which has rounded edges.
  • the member 25 is eccentrically mounted on a pin 26 which latter can turn with the member 25 about the Y axis of the pin 26, for which purpose the pin 26 is turnably journalled in the divider wall 2.
  • a knob or similar engaging element 27 is provided at the exterior of the hammer-drill, cooperating with the members 25 and 26 to turn them to two end positions; the knob 27 also acts upon the non-illustrated element which engages in the groove 21 and effects axial shifting of the shaft 9.
  • the sleeve 22 abuts at its end facing the tool side of the hammer-drill against a thrust bearing 28 and is supported via the same, and a helical spring 30 surrounding a portion 29 of the tool spindle 14, with respect to the gear 13 which is fast with the tool spindle.
  • the member 25 is in engagement with the sleeve 22, with that surface of the member 25 which permits the sleeve 22 to slide towards the right, that is towards the operators side, whereby the spindle 14 is not displaced as a result of pressure by the sleeve 22.
  • the knob 27 is turned through from the position shown in FIG.
  • the member 25 will be similarly turned and, because it is mounted eccentrically on the pin 26, the surface of the member 25 which will now engage the sleeve 22 will cause the latter to be displaced towards the left in FIG. 1, that is towards the tool side.
  • This causes the sleeve 22 to exert leftwardly directed pressure against the thrust bearing 28 and, via a shoulder 29 of the spindle portion 29, to displace the spindle 14 in the left-hand direction to such an extent that only sufficient axial space remains between the leftward-facing end of gear 13 and the rightwardfacing end of the bearing 24 to permit rotational movement of the spinle 14, that is sufficient axial play remains to employ the device as a drill.
  • the right-hand end of the gear 13, that is the one facing the operators side, is provided with an annulus 31 of projections surrounding the axis of rotation of the spindle 14.
  • This annulus 31 is juxtaposed with a pair of annular elements 32 and 33, which in the illustrated embodiment are concentric in that the element 33 is surrounded by the element 32.
  • the latter is fixedly mounted in the housing portion 3 and can neither turn nor shift axially.
  • the annular member 33 is guided in the member 32 by means of a neck portion 34, both turnably and axially displaceably.
  • An expansion spring 35 of helical configuration surrounds the neck portion 34 and abuts with its opposite ends against the annular member 32 and a circlip 36, respectively, the circlip 36 being retained in an outer circumferential groove on the neck portion 34. Because of this arrangement the spring 35 attempts to displace the annular member 33 towards the right, that is towards the operators side. In so doing it normally maintains the right-hand end face of the annular member 33 in engagement with the lefthand end face bounding the axial recess in the annular member 32, with both of these end faces being constructed as cam tracks 37 and 38,
  • An axially parallel longitudinal slot 39 is formed in the neck portion 34 and a guide projection or pin 40 of an annular member 40 made of synthetic plastic material, engages in the slot 39.
  • the end face of the member 40 which faces the operators side, that is the righthand side in FIG. 1, carries a bevel gear annulus 41 which cooperates with a similar annulus 42 of gear teeth provided on a knob 43 accessible at the exterior of the hammer-drill.
  • the knob 43 is turnably mounted on the housing portion 3 as shown.
  • FIG. 1 shows the left-hand end face of the annular member 32 carries an annulus 44 of gear teeth facing towards the annulus 31 of the gear 13; a similar annulus 45 of gear teeth is provided on the left-hand end face of the inner annular member 33.
  • the knob 43 When the knob 43 is turned it causes via the teeth 42 and 41 a turning of the member 40 and via the same this motion is transmitted by means of the projection 40' and the slot 39 to the inner annular member 33, causing the same to become angularly displaced. Because of the action of the cam tracks 37 and 38 the inner annular member 33 is displaced until its annulus 45 of gear teeth or projections is located in the plane of the annulus 44 from which it is normally retracted to the position shown in FIG. 1.
  • FIGS. 1 and 2 operate.
  • the output shaft 4 drives via pinion 7, shaft 9 and gears 12 and 13 the tool spindle 14 which thus rotates.
  • the handle 27 is in such a position that the member 25 displaces the sleeve 22 towards the left (the opposite position from the one shown in FIG. 1), then the spindle 14 is similarly displaced towards its left-hand end position via the member 22, the thrust bearing 28 and the shoulder 29 of the spindle member 29.
  • the working pressure which results during use of the device for drilling purposes is transmitted via the thrust bearing 28, the sleeve 22, the member 25 and the pin 26 to the divider wall 2, and thereby to the housing.
  • the spindle 14 which continues to be held in the lefthand position via the members 22, 28 and 30 now can axially and resiliently yield in the direction towards the operators side.
  • the spindle 14 can yield to a sufficient extent for the projections of the annulus 31 to come into engagement and mesh with the projections 44 of the member 32. Relative rotation of the member 13 with respect to the member 32 will now result in the transmission of axially directed impacts upon the tool spindle 14 and a drill bit carried by it, this being too well known to require any further explanation.
  • the projections of the annulus 45 may correspond in number to the projections of the annulus 44, but be angularly offset with respect to successive projections of the annulus 44 by half the distance between such successive projections. In that case, the cooperation of the projections of both annuli 44 and 45 with the projections of the annulus 31 will assure that the number of impacts transmitted to the tool spinlde 14 during each complete revolution thereof, is double the number which is transmitted to the tool spinlde if only the projections of the annulus 44 cooperate with the projections of the annulus 31.
  • FIG. 2 The top plan view of FIG. 2 is of the embodiment of FIG. 1 and shows the handles 27 and 43. It will be seen that the handle 27 can be turned to four operative positions, namely the positions I and II, on the one hand, and the positions III and IV, on the other hand. The two groups of positions are separated visually for easy identification by the line 27'.
  • the knob 27 When the knob 27 is in the position I, the device is used for drilling at low rotational speed (no impacts are transmitted to the spindle 14); when the knob 27 is in the position II the device is used for drilling at high rotational speed.
  • the knob 27 when the knob 27 is in the position III, the device drills at low rotational speeds and impacts are transmitted to the tool spindle, and in the position IV the device drills at high rotational speed and impacts are again transmitted to the tool spindle.
  • the number of impacts transmitted per complete revolution of the tool spindle can be varied, as already indicated with the knob 43 which has two operative positions A and B.
  • the knob 43 When the knob 43 is in the operative position A the number of impacts transmitted to the tool spindle per complete revolution will be low (only the annuli 31 and 44 will cooperate) and when the knob 43 is in the position B the number of impacts will be higher (the annuli 31, 44 and 45 will all cooperate).
  • the position A may for instance be utilized when the device is used with a drill bit having a diameter of mm.
  • the position B may be utilized when the device employs a drill bit having for instance a diameter of 16 mm.
  • FIGS. 3 and 4 we have illustrated a further embodiment which corresponds essentially to the embodiment in FIGS. 1 and 2, with like reference numerals identifying like components to the extent necessary.
  • FIGS. 3 and 4 differs essentially from that in FIGS. 1 and 2 in that the device for effecting the variation in the number of impacts per revolution is differently constructed.
  • the inner annular member is identified with reference 133 and has the neck 134 which is provided at its end facing the operators side with an annulus of gear teeth 146.
  • a rack 147 has teeth 148 which engage with the annulus 146; the rack 147 extends transversely to the axis of the tool spindle and can be shifted longitudinally.
  • the housing portion 103 has a bore 149 in which a ball member 151 (see FIG. 4) is located, being biased outwardly by a spring 150.
  • the ball member 151 can snap into one of two grooves provided in the rack 147, thereby providing an arresting means for the two possible positions of the inner annular member 133.
  • this embodiment is the same as the preceding one, and this includes the possibility of affording still a third position for the member 133, as discussed with respect to FIGS. 1 and 2.
  • FIG. 5 is of course self-explanatory, showing a view of the annuli 44 and 45 as seen in the direction of the arrow V in FIG. 1, and also in FIG. 3.
  • FIGS. 6 show two arrangements in which the varying of the number of impacts per rotation is achieved by making the inner annular member turnable but preventing it from axial displacement, and preventing it at the will of the operator from rotation with the annulus on the gear which rotates with the gear spindle.
  • the inner annular member 233 is provided with a shoulder 233 which prevents it from displacement towards the right, that is towards the operators side. Displacement towards the left that is towards the tool side is prevented by means of a circlip 233".
  • Neck 234 has a bore 234' (FIG. 9) which merges with a slot 234".
  • a sleeve 252 is mounted in the housing portion 203 and a bolt 254 provided with a handle 253, is turnable and shiftable in the sleeve 252.
  • a member 255, havin in this embodiment a cylindrical form with two opposite flat facets, is connected to that end of the bolt 254 which is remote from the handle 253, for instance by cooperating screw threads.
  • a spring is located in the sleeve 252 and presses the bolt 254 in direction inwardly of the housing portion 203.
  • a pin 256 is provided in the knob 253 in parallelism with the bolt 254 and is juxtaposed in the sleeve 252 with one flat and two deep recesses or bores which are offset through with reference to one another.
  • the bolt 254 and with it the member 255 can assume three positions, one in which it is pulled out and in which the member 255 does not interfere with the inner annular member 233, so that the latter can turn with the turnable annulus of projections on the tool spindle.
  • a second position is provided in which the maximum dimension of the member 255 extends in parallelism with the axis of the tool spindle and in which the bore 234 of the neck of the inner annular member 233 can accommodate the member 255.
  • there is a third position in which the maximum dimension of the member 255 extends transversely to the axis of rotation of the tool spindle and can enter into the slot 234".
  • FIGS. 13 15 is essentially similar to that of the preceding Figures, except that the arrangement for retaining the inner annular member is constructed as a turnable handle or knob which, when it is turned, will be raised via a cam track to such an extent that a detent member is withdrawn from a transverse bore in the neck of the inner annular member.
  • a manually held hammer drill in combination, housing means; drive means in said housing means and having a rotary output shaft; tool spindle means journalled in said housing means and extending in part out of the same; coupling means coupling said tool spindle means with said output shaft for rotation by the latter; impact means for transmitting to said tool spindle means a predetermined number of longitudinally acting impacts per revolution of said tool spindle means, said impact means comprising a first element fixedly mounted in said housing means, and a second element mounted on said tool spindle means, said elements, having juxtaposed surfaces provided with inter engaging annuli of projections which surround the axis of rotation of said tool spindle means; control means for effecting and terminating the interengagement of said projections at the will of an operator; varying means for varying said number of impacts at the will of an operator, said varying means comprising at least one additional element coaxially surrounded by said first element and also having an annulus of projections, said additional element being turnable about the axis of said tool spind
  • said arresting means being operative for arresting said additional element against turning in at least one further angularly displaced position of said additional element relative to said axis, at least some of the projections of said additional element being in the same angular orientation relative to said axis in one of said positions as corresponding projections of said first element.
  • a manually held hammer drill in combination, housing means; drive means in said housing means and having a rotary output shaft; tool spindle means journalled in said housing means and coupled with said output shaft for rotation therewith; impact means for transmitting to said tool spindle means a predetermined number of longitudinally acting impacts per revolution of said tool spindle means, said impact means comprising a first element fixedly mounted in said housing means, and a second element mounted on said tool spindle means, said elements having juxtaposed surfaces provided with interengageable annuli of projections; control means for effecting and terminating theinterengagement of said projections at the will of an operator; varying means for varying said number of impacts at the will of an operator, said varying means comprising at least one additional element coaxial with said first element and also having an annulus of projections, said additional element being turnable about the axis of said tool spindle means but being fixed against displacement longitudinally of said axis; and arresting means for arresting said additional element against turning in at least one angularly displaced position
  • a manually held hammer drill in combination, housing means; drive means in said housing means and having a rotary output shaft; tool spindle means journalled in said housing means and extending in part out of the same; coupling means coupling said tool spindle means with said output shaft for rotation by the latter; impact means for transmitting to said tool spindle means a number of longitudinally acting impacts per revolution of said tool spindle means, said impact means comprising a first element fixedly mounted in said housing means, and a second element mounted on said tool spindle means, said elements having juxtaposed surfaces provided with interengageable annuli of projections which surround the axis of rotation of said tool spindle means and are each located in a plane normal to said axis; varying means for varying said number of impacts at the will of an operator, said varying means comprising at least one axially movable additional element coaxially surrounded by said first element and having one additional annulus of projections surrounding said axis of rotation; and control means operative for selectively and at the will of

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)
US00243939A 1971-05-07 1972-04-14 Hammer-drill Expired - Lifetime US3834468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2122582A DE2122582C3 (de) 1971-05-07 1971-05-07 Von Hand geführte Drehschlagbohrmaschine

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US3834468A true US3834468A (en) 1974-09-10

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US00243939A Expired - Lifetime US3834468A (en) 1971-05-07 1972-04-14 Hammer-drill

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US (1) US3834468A (ja)
JP (1) JPS5427283B1 (ja)
BR (1) BR7202811D0 (ja)
CH (1) CH552432A (ja)
DE (1) DE2122582C3 (ja)
ES (1) ES402486A1 (ja)
FR (1) FR2139315A5 (ja)
GB (1) GB1395814A (ja)
IT (1) IT955286B (ja)
NL (1) NL7206106A (ja)

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US4763733A (en) * 1985-10-26 1988-08-16 Hilti Aktiengesellschaft Hammer drill with rotational lock
US5111889A (en) * 1990-03-29 1992-05-12 Hilti Aktiengesellschaft Drilling tool speed shifting unit
US5505271A (en) * 1993-05-01 1996-04-09 Black & Decker Inc. Power tools and hammer mechanisms therefor
US5704433A (en) * 1993-03-05 1998-01-06 Black & Decker Inc. Power tool and mechanism
US5711379A (en) * 1995-05-29 1998-01-27 Makita Corporation Hammer drill
EP0976505A2 (de) * 1998-07-25 2000-02-02 HILTI Aktiengesellschaft Handbohrgerät
US6176321B1 (en) * 1998-09-16 2001-01-23 Makita Corporation Power-driven hammer drill having an improved operating mode switch-over mechanism
US6192996B1 (en) * 1999-08-26 2001-02-27 Makita Corporation Mode changing mechanism for use in a hammer drill
US6688406B1 (en) 2003-01-29 2004-02-10 Mobiletron Electronics Co., Ltd. Power tool having a function control mechanism for controlling operation in one of rotary drive and hammering modes
US6691796B1 (en) 2003-02-24 2004-02-17 Mobiletron Electronics Co., Ltd. Power tool having an operating knob for controlling operation in one of rotary drive and hammering modes
EP1393863A1 (en) * 2002-08-27 2004-03-03 Matsushita Electric Works, Ltd. Hammer Drill
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US20050028996A1 (en) * 2003-08-06 2005-02-10 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
US20060231277A1 (en) * 2005-04-19 2006-10-19 Daniel Puzio Outer bearing retention structures for ratchet hammer mechanism
US20070056756A1 (en) * 2005-09-13 2007-03-15 Eastway Fair Company Limited Impact rotary tool with drill mode
US20070251708A1 (en) * 2005-02-10 2007-11-01 Michael Stirm Hammer
US20080058671A1 (en) * 2004-09-27 2008-03-06 Vibratech Ab Arrangement For Cell Sampling
US20080210448A1 (en) * 2007-03-02 2008-09-04 Andre Ullrich Hand power tool
US20100084151A1 (en) * 2006-12-14 2010-04-08 Axel Kuhnle Electrical device with locked-on rotatable operating element
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
US20100200380A1 (en) * 2009-02-12 2010-08-12 Black & Decker Inc. Switch Assembly for a Power Tool
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
CN101648286B (zh) * 2008-08-14 2011-09-07 苏州宝时得电动工具有限公司 冲击钻
US20120111594A1 (en) * 2009-06-26 2012-05-10 Tobias Herr Hand-held power tool
US20120152577A1 (en) * 2010-12-20 2012-06-21 Christopher Mattson Hand tool impacting apparatus and method
US20160023344A1 (en) * 2014-07-28 2016-01-28 Black & Decker Inc. Mode Change Knob Assembly
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
US11305406B2 (en) * 2019-02-19 2022-04-19 Makita Corporation Power tool having hammer mechanism
US11484978B2 (en) 2017-08-18 2022-11-01 Hilti Aktiengesellschaft Electrically insulated locking element

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DE2951644A1 (de) * 1979-12-21 1981-07-02 Mafell Maschinenfabrik Rudolf Mey GmbH & Co KG, 7238 Oberndorf Motorgetriebenes handwerkzeug
AT372639B (de) * 1980-11-06 1983-10-25 Hilti Ag Schlagbohrmaschine
FR2547347B1 (fr) * 1983-06-10 1985-09-06 Ts P Konstruktors Machine miniere de forage avec mecanismes de rotation et de percussion a commandes independantes
JPH0746470Y2 (ja) * 1991-05-10 1995-10-25 リョービ株式会社 ドリル等の切換用操作つまみ装置

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US6196330B1 (en) * 1998-07-25 2001-03-06 Hilti Aktiengesellschaft Manually operable drilling tool with dual impacting function
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US20080058671A1 (en) * 2004-09-27 2008-03-06 Vibratech Ab Arrangement For Cell Sampling
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US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
US8555998B2 (en) 2007-11-21 2013-10-15 Black & Decker Inc. Multi-mode drill with mode collar
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US8109343B2 (en) 2007-11-21 2012-02-07 Black & Decker Inc. Multi-mode drill with mode collar
CN101648286B (zh) * 2008-08-14 2011-09-07 苏州宝时得电动工具有限公司 冲击钻
US20100200380A1 (en) * 2009-02-12 2010-08-12 Black & Decker Inc. Switch Assembly for a Power Tool
US8436267B2 (en) 2009-02-12 2013-05-07 Black & Decker Inc. Switch assembly for a power tool
EP2218553A1 (en) 2009-02-12 2010-08-18 Black & Decker Inc. Switch Assembly for a Power Tool
US9421679B2 (en) * 2009-06-26 2016-08-23 Robert Bosch Gmbh Hand-held power tool
US20120111594A1 (en) * 2009-06-26 2012-05-10 Tobias Herr Hand-held power tool
US20120152577A1 (en) * 2010-12-20 2012-06-21 Christopher Mattson Hand tool impacting apparatus and method
US9102046B2 (en) * 2010-12-20 2015-08-11 Brigham Young University Hand tool impacting device with floating pin mechanism
US9981364B2 (en) 2010-12-20 2018-05-29 Brigham Young University Hand tool impacting device with floating pin mechanism
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
US20160023344A1 (en) * 2014-07-28 2016-01-28 Black & Decker Inc. Mode Change Knob Assembly
US10046450B2 (en) * 2014-07-28 2018-08-14 Black & Decker Inc. Mode change knob assembly
US11484978B2 (en) 2017-08-18 2022-11-01 Hilti Aktiengesellschaft Electrically insulated locking element
US11305406B2 (en) * 2019-02-19 2022-04-19 Makita Corporation Power tool having hammer mechanism

Also Published As

Publication number Publication date
ES402486A1 (es) 1975-03-16
IT955286B (it) 1973-09-29
JPS5427283B1 (ja) 1979-09-08
BR7202811D0 (pt) 1973-04-26
FR2139315A5 (ja) 1973-01-05
DE2122582A1 (de) 1972-11-16
NL7206106A (ja) 1972-11-09
GB1395814A (en) 1975-05-29
CH552432A (de) 1974-08-15
DE2122582C3 (de) 1980-01-10
DE2122582B2 (de) 1979-05-31

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