US3785443A - Portable electric impact tool - Google Patents

Portable electric impact tool Download PDF

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Publication number
US3785443A
US3785443A US00308941A US3785443DA US3785443A US 3785443 A US3785443 A US 3785443A US 00308941 A US00308941 A US 00308941A US 3785443D A US3785443D A US 3785443DA US 3785443 A US3785443 A US 3785443A
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US
United States
Prior art keywords
spindle
gear
combination
gears
housing
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
US00308941A
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English (en)
Inventor
G Armbruster
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/008—Gear boxes, clutches, bearings, feeding mechanisms or like equipment
    • 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
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19219—Interchangeably locked
    • Y10T74/19293—Longitudinally slidable
    • Y10T74/19298—Multiple spur gears
    • Y10T74/19307—Selective
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19219—Interchangeably locked
    • Y10T74/19377—Slidable keys or clutches
    • Y10T74/19414—Single clutch shaft
    • Y10T74/19419—Progressive
    • Y10T74/19442—Single key
    • Y10T74/19451—Spur gears
    • Y10T74/1946—Sliding clutch carrier

Definitions

  • ABSTRACT A portable electric impact drill wherein an axially reciprocable tool spindle can be driven at two speeds by a gear transmission which is installed in front of a universal electric motor.
  • the tool spindle is movable axially by a rotary or reciprocable selector to assume one of four positions including a first position in which it receives torque from a first gear of the transmission and is driven at a relatively low speed, a second position in which it receives torque from a second gear of the transmission and is driven at a relatively high speed, a third position in which it is disengaged from both gears, and a fourth position in which it receives torque from the second gear and causes an annulus of projections on the second gear to travel along an annulus of projections in the housing of the power tool so that the tool spindle rotates at the higher speed and is'caused to perform axial oscillatory movements.
  • the present invention relates to portable powertools in general, especially to electric power tools, and more particularly to imrprovements in portable electric impact drills, wrenches or the like. Still more particularly, the invention relates to improvements in electric impact tools wherein the tool spindle can be driven at a plurality of speeds.
  • a drawback of presently known portable electric power tools wherein the tool spindle can receive axial impulses and can be driven at several speeds is that the transmission for the tool spindle is bulky, expensive and consists of a large number of precision-finished parts. Furthermore, the speed changes must be effected by rotating, shifting and/or otherwise moving several discrete parts so that the manipulation of such power tools cannot be entrusted to unskilled operators.
  • An object of the invention is to provide a portable power tool, especially an electric impact drill,which is simpler, less expensive, lighter, more compact and easier to manipulate than presently known power tools.
  • Another object of the invention is to provide a portable electric impact tool with a novel and improved multispeed transmission for the tool spindle.
  • a further object of the invention is to provide the electric impact tool with novel and improved means for selecting the speeds of the tool spindle and for moving the tool spindle to at least one further position in which the tool spindle is caused to perform axial oscillatory movements.
  • An additional object of the invention is to provide a portable electric impact tool with a multi-speed transmission for the tool spindle which can be manipulated not only by skilled operators but also by tinkers and other amateurs.
  • Still another object of the invention is to provide a portable electric impact drill or an analogous tool with novel and improved means for mounting the tool spindle, parts of the multi-speed transmission for the tool spindle and other components in the interior of the housing.
  • An ancillary object of the invention is to provide the power tool with a novel and improved tool spindle.
  • the improved portable power tool can be used with particular advantage as an impact drill and preferably embodies an electric motor.
  • the power tool comprises a preferably plastic housing, a tool spindle which is rotatably and axially movably mounted in the housing and is connected with a chuck or analogous tool retaining means, a multi-speed transmission which is installed in the housing and includes first and second gears mounted on the tool spindle and means for rotating the first and second gears at different speeds, first coupling means provided on each of the gears, second coupling means provided on the tool spindle, axial impulse transmitting means provided in the housing, and selector means which is actuatable to move the tool spindle between a plurality of positions including a first position in which the coupling means of the tool spindle receives torque from the coupling means of the first gear, a second position in which the coupling means of the tool spindle receives torque from the coupling means of the second gear and a third position in which the tool spindle receives torque from one of the gear
  • the impulse transmitting means may comprise a first annulus of projections provided on a stationary portion of the housing and the one gear is preferably provided with a second annulus of projections which ride over the projections of the first annulus to thereby transmit to the tool spindle axial impulses while the coupling means of the tool spindle receives torque from the coupling means of the one gear.
  • FIG. 1 is a longitudinal vertical sectional view of a portable electric impact drill which embodies one form of the invention, the section being taken in the direction of arrows as seen from the line 1-1 of FIG. 2;
  • FIG. 2 is a transverse vertical sectional view as seen in the direction of arrows from the line IIII of FIG.
  • FIG. 3 is a fragmentary longitudinal vertical sectional view of a second power tool
  • FIG. 4 is a similar fragmentary longitudinal vertical sectional view of a third power tool
  • FIG. 5 is a longitudinal vertical sectional view of the front portion of a fourth power tool.
  • FIG. 6 is a fragmentary longitudinal vertical sectional view of the front portion of a fifth power tool.
  • FIGS. 1 and 2 there is shown a portable electric power tool which constitutes an impact drill.
  • the power tool comprises a housing including an outer portion consisting of two shells 1, 2 made of synthetic plastic material and defining a chamber which accommodates a universal electric motor 6 and a twospeed transmission which can driven an axially movable rotary tool spindle 17 at a higher speed and a lower speed.
  • the rear portions of the shells 1 and 2 form a handle 3 having an opening for a cable 4 provided with a plug (not shown) which is connectable to an outlet.
  • the motor 6 can be started in response to depression of a switch trigger 5.
  • the electric motor 6 comprises a rotor 7 which is secured to the rear portion 8 of an output shaft.
  • the latter is formed with a blind axial bore for an insulating sleeve 9 which receives the rear part of the front shaft portion 10.
  • the shaft portion 10 extends forwardly beyond the sleeve 9 and carries a fan 11 which serves to cool the interior of the housing.
  • the rear shaft portion 8 has a smaller-diameter rear end 12 which is received in a sleeve 13 mounted in the housing and consisting of sintered metal.
  • the front shaft portion extends forwardly beyond the fan 11 and is rotatable in a needle bearing 14 which is installed in a bridge member 15 secured to the shell 1 by two screws 16.
  • the bridge member 15 is installed in the chamber which is defined by the outer portion 1, 2 of the housing and can be said to form part of this housing.
  • the tool spindle 17 is also mounted in the bridge member 15 and its rear end portion 17' is of semispherical outline.
  • a first intermediate shaft 18 of the twospeed transmission is a press fit in a bore of the bridge member 15 and carries a gear cluster 21 consisting of sintered metal and including a smaller gear 20 and a larger gear 19.
  • the gear cluster 21 is rotatable on the intermediate shaft 18in front of the bridge member 15.
  • the larger-diameter gear 19 meshes with a small gear or pinion 22 constituting the foremost end of the output shaft portion 10 and being located in front of the needle bearing 14 in the bridge member 15.
  • the pinion 22 further meshes with a gear 23 which is rotatable on the tool spindle 17 in front of the bridge member 15 and is located behind a similar gear 31.
  • the latter is also rotatable on the tool spindle 17 and meshes with a gear 34 which is driven by the gear 20 of the gear cluster 21 and is rotatable on a second intermediate shaft 33 a portion of which is a press fit in a bore of the bridge member 15.
  • the gear 31 is mirror symmetrical to the gear 23 with reference to a plane which is located between the gears 23, 31 and is normal to the axis of the tool spindle 17. At least one of the gears 23, 31 may consist of sintered metal.
  • the spindle 17 is movable axially of the gears 23 and 31.
  • the surface surrounding the groove 26 constitutes a torque transmitting coupling element of the gear 23 and can rotate the too] spindle 17 by way of a torque receiving coupling element 28 here shown as a pin received in a transverse bore 27 of the tool spindle 17 and extending with bothends beyond the peripheral surface of the tool spindle so as to be receivable in the groove 26 in two predetermined axial positions of the tool spindle.
  • a torque receiving coupling element 28 here shown as a pin received in a transverse bore 27 of the tool spindle 17 and extending with bothends beyond the peripheral surface of the tool spindle so as to be receivable in the groove 26 in two predetermined axial positions of the tool spindle.
  • the rear end face of the front gear 31 on the tool spindle 17 is provided with a circular recess 31 the bottom wall of which has a diametrically extending groove 32.
  • the surface surrounding the groove 32 constitutes a torque transmitting coupling element of the gear 31 and can rotate the tool spindle 17 by way of the coupling element 28 in a further predetermined axial position of tool spindle.
  • the combined axial length of the circular recesses 23, 31' exceeds the diameter of the coupling element 28 so that the tool spindle 17 can be moved to still another axial position in which the coupling element 28 is located in the recesses 23, 31 without extending into the groove 26 and/or 32. In such axial position, the spindle 17 is at a standstill even if the gears 23, 31 rotate.
  • the axis of the transverse bore 27 preferably intersects the axis of the tool spindle 17, and the length of both outwardly projecting end portions of the coupling element 28 is preferably the same.
  • the tool spindle 17 extends forwardly beyond the gears 23, 3'1 and is rotatable and axially movable in a bearing sleeve 30 which is mounted in a neck portion of the housing including the shells 1, 2 and preferably consists of sintered metal.
  • the foremost part of the tool spindle 17 is rigidly connected to a conventional chuck 29 which can take and rotate a screwdriver, a boring tool, a wrench or any other tool capable of performing work in response to rotation and/or axial oscillatory movements of the tool spindle.
  • the axial length of that portion of the intermediate shaft 18 which extends forwardly beyond the bridge member 15 preferably equals the axial length of the corresponding portion of the intermediate shaft 33.
  • the front portions of the intermediate shafts 18 and 33 have reduced diameters (see the portion 18' of the intermediate shaft 18 in FIG. 1) and are received in apertures provided in a metallic plate-like holder 35. Those parts of the intermediate shafts l8 and 33 which extend beyond the respective apertures of the holder 35 are upset to respectively form rivets 18" and 33".
  • the purpose of the holder 35 is to hold the gears 20, 34 and 31 against axial movement and to prevent sidewise movements of intermediate shafts 18, 33 relative to each other.
  • the rear face of the bridge member 15 is provided with a blind bore for the front end portion of a shaft 36 which is a press fit therein and the rear end portion of which extends into a blind bore 37 of the shell 1.
  • the intermediate portion of the shaft 37 supports rotary selector knob 38 having a serrated, knurled or otherwise roughened peripheral surface 39 a portion of which extends outwardly through a window 40 of the shell 1 so that it can be reached by a finger of the operator.
  • the rear end face of the knob 38 is formed with a set of four detent notches 41 (only one shown in FIG.
  • the knob 38 is provided with four notches 41 (all of which are equidistant from the axis of the shaft 37) because the tool spindle 17 is assumed to be movable between four different axial positions.
  • the rear face of the knob 38 preferably abuts against that portion of the surface of the shell 1 which bounds the rearmost part of the window 40.
  • the ball 44 preferably consists of steel and is mounted in the bore 42 of the shell 1 in such a way that it automatically enters into and is expelled from successive notches 41 in response to rotation of the knob 38.
  • a portion of the selector knob 38 constitutes a cam having an arcuate cam face 38 which is formed with four steps and can be tracked by the semispherical rear end portion or follower 17 of the tool spindle 17.
  • the four steps of the cam face 38 are preferably connected to each other by inclined guide surfaces (not specifically shown) along which the follower 17 slides in response to rotation of the knob 38.
  • the top of the tool which is mounted in the chuck 29 normally bears against a workpiece so that the tool spindle 17 (which is rigid with the housing of the chuck 29) tends to move rear-wardly (toward the universal motor 6) and thus maintains the follower 17' in abutment with the cam face 38.
  • the selector knob 38 can move the tool spindle 17 to any one of the following four axial positions:
  • the tool spindle 17 In a first axial position, the tool spindle 17 is remotest from the motor 6 and maintains its coupling element 28 in the groove 32 of the front gear 31. The tool spindle 17 is then rotated at a relatively slow speed by way of the front output shaft portion 10, pinion 22, gear cluster 21, gear 34 and gear 31.
  • the coupling element 28 is located between the grooves 26, 32 (i.e., in the recesses 23, 31') and is at a standstill even if the gears 23 and 31 are driven by the motor 6.
  • the tool spindle 17 maintains its coupling element 28 in the groove 26 of the gear 23 so that it is driven at a relatively high speed by way of the shaft portion 10, pinion 22, gear cluster 21 and gear 23.
  • the tool spindle maintains its coupling element 28 in the groove 26 of the gear 23 so that it is driven at a relatively high speed.
  • the tool spindle l7 urges the gear 23 rearwardly (by way of the coupling element 28) so that the projections 24 of the gear 23 ride over the stationary projections 25 of the bridge member and causes the gear 23 to oscillate with the tool spindle 17 by moving therewith axially back and forth while the coupling element 28 remains in the groove 26 so that the gear 23 continues to drive the tool spindle.
  • the thus received impulses are communicated to the tool which is mounted in the chuck 29 so that the tool is more likely to penetrate into the material of a workpiece.
  • cam face 38' on the selector knob 38 is such that, when the tool spindle 17 assumes its forth axial position, it has sufficient freedom of axial oscillatory movement while the projections 24 of the gear 23 travel along the projections 25 of the bridge member 15.
  • the gear 34 may consist of sintered metal.
  • FIG. 3 illustrates a modified construction of the rear end portion of a tool spindle 117.
  • This rear end portion has a socket 117A for a spherical follower 17a which tracks the cam face 38 of the rotary selector knob 38 on the shaft 36.
  • the spherical follower 17a preferably consists of hardened steel or the like.
  • the socket 117A is initially formed as an axial blind bore to receive a little more than one-half of the spherical follower 17a; in the next step, the marginal portion of the spindle 117 at the open end of the blind bore is upset to prevent uncontrolled escape of the follower 17a from the thus obtained socket 117A.
  • FIG. 4 shows the rear end portion of a third tool spindle 217 which is formed with an axial blind bore 17b the innermost part of which receives a steel ball 17d.
  • This ball constitutes an anvil for the rounded front end portion of an elongated cylindrical pin 17c which consists of hardened steel or the like and has a semispherical rear end portion constituting a follower which tracks the cam face 38' of the selector knob 38.
  • the pin 17c is reciprocable in the axial bore 17b of the tool spindle 217.
  • Flg. 5 illustrates the front portion of a modified power tool wherein the tool spindle 317 is formed with a circumferential groove l7e located in front of the gear 31 and receiving a split ring 17f serving as a re tainer for the smallest rearmost convolution of a conical helical spring 17g bearing against an internal surface of the outer housing portion formed by the shell 1 and/or 2. If desired, a thrust bearing can be interposed between the rearmost convolution of the spring 17g and the split ring 17f.
  • the purpose of the spring 17g is to bias the tool spindle 317 against the cam face 38 of the knob 38 even if the tool which is mounted in the chuck (not shown) does not engage a workpiece and even if the power tool is held in such position that the chuck is located at its lower end, i.e.. that the tool spindle 317 tends to move away from the cam face 38 under the action of gravity.
  • FIG. 5 shows the tool spindle 317 in the aforediscussed third axial position in which the coupling element 28 receives torque from the coupling element of the rear gear 23 so that the spindle 317 is driven at the higher of two speeds as soon as the operator depresses the switch trigger 5 (FIG. 1).
  • the spring 17;; is preferably disengaged from the split ring 17f when the tool spindle 317 is moved to the fourth axial position in which it receives impulses from the projections 25 of the bridge member 15.
  • the helical spring 17g has been replaced by a leaf spring 17h which bears against the split ring 17f and tends to maintain the tool spindle 317 in the third axial position.
  • the bias of the leaf spring 17h is prefera bly such that the spindle 317 cannot move forwardly from its second or third axial position except, of course, in response to rotation of the selector knob 38 (not shown in FIG. 6).
  • the rotary selector knob 38 may be replaced by a reciprocable selector element which can move lengthwise between several positions each of which corresponds to a different axial position of the tool spindle.
  • a reciprocable selector element is preferably movable in parallelism with the axis of the tool spindle.
  • An important advantage of the improved power tool is that it consists of a relatively small number of simple, rugged and long-lasting parts in spite of the fact that the housing receives a multi-speed transmission.
  • Another advantage of the improved power tool is that the axial' positions of the tool spindle can be changed by means of a single selector in a time-saving operation and with the exertion of a minimal effort.
  • the coupling element 28 leaves the groove 32 as soon as the tip of a tool in the chuck 29 is pressed against a workpiece so that the spindle assumes an axial position which is dictated by the selected setting of the knob 38.
  • a combination comprising a housing; a tool spindle rotatably and axially movably mounted in said housing; a multi-speed transmission provided in said housing and including first and second gears rotatably mounted on said spindle and means for rotating said gears at different speeds, each of said gears having torque transmitting first coupling means and said spindle having torque receiving second coupling means; axial impulse transmitting means provided in said housing; and selector means actuatable to effect axial movements of said spindle between a plurality of positions including first and second positions in which said second coupling means respectively engages with and receives torque from the first coupling means of said first and second gears and a third position in which said second coupling means engages the first coupling means of one of said gears and at least said spindle receives axial impulses from said impulse transmitting means so that said spindle oscillates axially while being driven by said one gear.
  • said impulse transmitting means comprises a first annulus of projections provided in said housing and said one gear comprises a second annulus of projections which travel along the projections of said first annulus in said third position of said spindle.
  • said selector means comprises a rotary element mounted in said housing and having a cam face tracked by said follower means, said rotary element being turnable by hand to thereby change the axial position of said spindle by way of said cam face and said follower means.
  • said housing includes an outer portion defining a chamber and a bridge member provided in said chamber, said spindle having a portion rotatable and axially movable in said bridge member and said impulse transmitting means being provided on said bridge member.
  • said means for rotating said gears at different speeds comprises an intermediate shaft mounted in said bridge member and a third gear mounted on said intermediate shaft and meshing with said first gear.
  • a combination as defined in claim 12, wherein said means for rotating said first and second gear at different speeds further comprises a second intermediate shaft mounted in said bridge member and a fourth gear mounted on said second intermediate shaft and meshing with said second gear.
  • said selector means comprises a rotary element and a shaft for said rotary element, said shaft being mounted in said bridge member.
  • first and second gears are mirror symmetrical to each other with reference to a plane passing between said first and second gears and normal to the axis of said tool spindle.
  • said housing comprises an outer portion defining a chamber for said transmission and a bridge member provided in said chamber and consisting of sintered metal, said spindle being rotatably and axially movably mounted in said bridge member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)
US00308941A 1971-11-24 1972-11-24 Portable electric impact tool Expired - Lifetime US3785443A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712158118 DE2158118B2 (de) 1971-11-24 1971-11-24 Zweigang-handbohrmaschine

Publications (1)

Publication Number Publication Date
US3785443A true US3785443A (en) 1974-01-15

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ID=5825927

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Application Number Title Priority Date Filing Date
US00308941A Expired - Lifetime US3785443A (en) 1971-11-24 1972-11-24 Portable electric impact tool

Country Status (8)

Country Link
US (1) US3785443A (de)
JP (1) JPS5733124B2 (de)
AU (1) AU453892B2 (de)
BR (1) BR7208248D0 (de)
CH (1) CH543332A (de)
DE (1) DE2158118B2 (de)
ES (1) ES408902A1 (de)
GB (1) GB1349437A (de)

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US4232749A (en) * 1977-10-22 1980-11-11 Robert Bosch Gmbh Convertible rotary/percussion drill
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US4418766A (en) * 1979-07-25 1983-12-06 Black & Decker Inc. Compact multi-speed hammer-drill
US4487272A (en) * 1982-02-13 1984-12-11 Robert Bosch Gmbh Impacting drill
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US20090129876A1 (en) * 2007-11-21 2009-05-21 Black & Decker Inc. Multi-speed drill and transmission with low gear only clutch
US20100026107A1 (en) * 2008-07-30 2010-02-04 Hitachi Kodki Co., Ltd. Power tool
US7735575B2 (en) 2007-11-21 2010-06-15 Black & Decker Inc. Hammer drill with hard hammer support structure
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
US20120048585A1 (en) * 2010-08-25 2012-03-01 Makita Corporation Handheld electrical power tools
US20120205132A1 (en) * 2010-01-21 2012-08-16 Wenjiang Wang Light single-button multifunctional electric hammer
US20150122524A1 (en) * 2013-11-06 2015-05-07 Robert Bosch Gmbh Portable Power Tool
US10807226B2 (en) 2014-07-23 2020-10-20 Black & Decker Inc. Range of power tools
US20210114194A1 (en) * 2019-10-21 2021-04-22 Makita Corporation Power tool having hammer mechanism
US11484978B2 (en) 2017-08-18 2022-11-01 Hilti Aktiengesellschaft Electrically insulated locking element
US11865691B2 (en) 2020-12-10 2024-01-09 Black & Decker Inc. Power tool with chuck key holder

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US5011341A (en) * 1989-11-09 1991-04-30 The Aro Corporation Two speed gear system for power tool
JPH0633418U (ja) * 1992-10-02 1994-05-06 優 高橋 刈払機用飛散防護カバー
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US8109343B2 (en) 2007-11-21 2012-02-07 Black & Decker Inc. Multi-mode drill with mode collar
US8555998B2 (en) 2007-11-21 2013-10-15 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
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US9259832B2 (en) * 2010-08-25 2016-02-16 Makita Corporation Handheld electrical power tools
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US11484978B2 (en) 2017-08-18 2022-11-01 Hilti Aktiengesellschaft Electrically insulated locking element
US20210114194A1 (en) * 2019-10-21 2021-04-22 Makita Corporation Power tool having hammer mechanism
US11529727B2 (en) 2019-10-21 2022-12-20 Makita Corporation Power tool having hammer mechanism
US11826891B2 (en) * 2019-10-21 2023-11-28 Makita Corporation Power tool having hammer mechanism
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Also Published As

Publication number Publication date
JPS4860363A (de) 1973-08-24
BR7208248D0 (pt) 1973-08-30
CH543332A (de) 1973-10-31
JPS5733124B2 (de) 1982-07-15
DE2158118C3 (de) 1980-01-10
AU4921472A (en) 1974-05-30
GB1349437A (en) 1974-04-03
DE2158118A1 (de) 1973-05-30
AU453892B2 (en) 1974-10-17
DE2158118B2 (de) 1977-10-27
ES408902A1 (es) 1975-10-01

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