CN102922492A - Rotatable chisel jacket assembly - Google Patents
Rotatable chisel jacket assembly Download PDFInfo
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- CN102922492A CN102922492A CN2012103955994A CN201210395599A CN102922492A CN 102922492 A CN102922492 A CN 102922492A CN 2012103955994 A CN2012103955994 A CN 2012103955994A CN 201210395599 A CN201210395599 A CN 201210395599A CN 102922492 A CN102922492 A CN 102922492A
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Abstract
The invention relates to a rotatable chisel jacket assembly, and mainly aims to solve the technical problems that the conventional jacket of an electric pick cannot rotate, so that the operation of the electric pick is influenced, and the like. The rotatable chisel jacket assembly is characterized in that one end of a main sleeve penetrates through a connecting sleeve, and the other end of the main sleeve is rotationally and axially fixed in the connecting sleeve; a clamped rotating device is arranged outside the connecting sleeve and comprises a clamped rotating sliding sleeve, multiple balls and a return spring; through holes for accommodating the balls are formed on the peripheral wall of the connecting sleeve; multiple clamping grooves matched with the balls in an annular array are formed on the peripheral side wall of the main sleeve and below the through holes; the clamped rotating sliding sleeve and the return spring are arranged outside the connecting sleeve; and the clamped rotating sleeve can horizontally move along with the connecting sleeve under driving of the return spring, so that the balls in the through holes and the clamping grooves are attached and locked at a first working position of the main sleeve, the clamped rotating sliding sleeve is driven to horizontally move under the action of external force, and the balls and the clamping grooves are separated from each other at a second working position.
Description
Technical field
The present invention relates to a kind of locking device, relate in particular a kind of rotating chisel chuck assembly, be mainly used in the electric pick field.
Background technology
Electric pick is mainly used in pipeline laying, mechanical erection, plumbing Facilities Construction, interior decoration, port facilities construction and other engineering constructions, and for the ease of concrete, masonry structure, bituminous paving being carried out the operations such as fragmentation, chipping, excavation, fluting, cutting, chisel or cutter shovel etc. are installed in the electric pick chuck are carried out operation.Existing chuck only possesses chisel is fixed on the electric pick head, and the type of chisel is a lot of at present, such as diamond bit, flat chisel or cutter shovel etc., such as electric pick when using flat chisel or cutter shovel, because chuck can not rotate, when the edge of a knife of flat chisel or cutter shovel with punching or the direction of groove inconsistent, at this moment, can only adjust position or the angle of electric pick, if on the ground operation, adjustment is to be relatively easy to, if and setting aloft, operating personnel are unsettled or when utilizing the ladder operation, and position or the angle of removing to adjust electric pick because flat chisel or cutter perching knife mouth are inconsistent are just not too easy, affect operational benefit.
Summary of the invention
For the chuck that solves existing electric pick can not rotate, affect the technical problems such as electric pick operation; The invention provides a kind of rotating chisel chuck assembly, this chuck assembly not only can clamp chisel, simultaneously, the edge of a knife of chisel with punching or groove direction when inconsistent, the edge of a knife that rotatable chuck makes chisel with punching or groove consistent, conveniently carry out operation.
For solving above technical problem, the technical scheme that the present invention takes is a kind of rotating chisel chuck assembly, it includes and can also can cut a hole the main sleeve pipe of bar and connect main sleeve pipe and the joint sleeve of electric pick housing by clamping device is fixing by accommodating cutter bar, main sleeve pipe one end is connected with joint sleeve, and clamping device is installed in the other end of main sleeve pipe; It is characterized in that described main sleeve pipe one end passes joint sleeve, the other end is rotating to be axially fixed in the joint sleeve, and outside joint sleeve, be provided with the card rotary device, this card rotary device includes card and turns sliding sleeve, a plurality of ball and back-moving spring, joint sleeve week sidewall be provided with the through hole of accommodating ball, all sidewalls of main sleeve pipe be positioned at through hole below be provided with the draw-in groove that a plurality of and ball of circular array cooperates; Card turns sliding sleeve and back-moving spring is nested with outside joint sleeve, and card pivoted housing pipe can be along the joint sleeve horizontal displacement under the driving of back-moving spring and the ball that places in the through hole and draw-in groove fitted lock the first operating position and the under external force driver card pivoted housing pipe horizontal displacement of main sleeve pipe and make ball and the second operating position that draw-in groove is separated.
Further, be provided with the first limited step in the described joint sleeve, described card turns sliding sleeve and includes and be nested with the passive sliding sleeve outside joint sleeve and be nested with active sliding sleeve outside passive sliding sleeve, and the outer wall cross section of passive sliding sleeve and sliding sleeve inner wall section initiatively are all stepped and complement each other to form synchronous interaction; Outside the active sliding sleeve, be provided with the annular stop boss, back-moving spring one end and passive sliding sleeve compress mutually and drive ball and draw-in groove and be affixed to merge and sliding sleeve one end and the first limited step pushed up mutually press spacing, and displacement is separated ball and draw-in groove and can makes positive stop lug boss and the clamping device of active sliding sleeve compress mutually spacing the active sliding sleeve with passive sliding sleeve level of synchronization under external force drives; Be provided with at passive sliding sleeve inwall and can drive the second limited step that ball and draw-in groove compress mutually, the second limited step and open-ended inwall form stepped.
Further, described passive sliding sleeve is provided with annular boss with the end that back-moving spring compresses mutually, and back-moving spring places in the annular boss.
Further, described draw-in groove is opening U-shaped shape, and the cross section is that the external diameter of arc and ball is complementary, and described ball is provided with 2～4, is arranged with the through hole of accommodating ball at the sidewall of joint sleeve.
Further, but described clamping device includes and is nested with outside main sleeve pipe and locking sliding sleeve and the locking sliding sleeve synchronous interaction of horizontal sliding and be nested with hand push sliding sleeve and lock dog outside the locking sliding sleeve, lock dog is mobilizable to be fixed in the counterbore that connects main sleeve pipe sidewall, back-moving spring one end compresses mutually with the locking sliding sleeve, the other end with by movable slider pressures that offset, the hand push sliding sleeve can drive under external force the horizontal displacement of locking sliding sleeve and make the first operating position that lock dog and cutter bar square groove be separated and drive the locking sliding sleeve at back-moving spring and make lock dog and second operating position of cutting a hole the bar square groove and being interlocked.
Further, described lock dog is provided with two, correspondingly on the inwall of locking sliding sleeve is provided with the groove that an end is opening, and lock dog can place in the groove square groove with the cutter bar to be separated under external force.
Further, the end of described main sleeve pipe is provided with rubber sleeve, and hand push slides over next end of External Force Acting and pushes up mutually spacing cooperation of pressure with the positive stop lug boss of joint sleeve; The other end at action of reset spring assistant sliding cover can compress spacing the cooperation mutually with rubber sleeve.
The invention has the beneficial effects as follows outside joint sleeve, to add the card rotary device, in use, draw-in groove on ball and the main sleeve pipe is fitted lock main sleeve pipe thereby utilize the back-moving spring driver card to turn sliding sleeve top nip drum pearl; And if when need rotating the cutter bar, turn the sliding sleeve horizontal displacement with regard to available hand propelled card to make splenium position, top leave the through hole top, at this moment, rotate main sleeve pipe ball and draw-in groove are separated realize the rotation of cutter bar, thereby operation is convenient in the adjusting of conveniently cutting a hole the bar angle.
Description of drawings
Fig. 1 is the sectional structure chart of a kind of rotating chisel chuck assembly of the embodiment of the invention
Fig. 2 is the three-dimensional structure diagram of embodiment of the invention master sleeve pipe
Fig. 3 is the three-dimensional structure diagram of embodiment of the invention locking sliding sleeve
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described further:
As shown in Figure 1 to Figure 3, the present invention is a kind of rotating chisel chuck assembly, the joint sleeves 2 that it includes the main sleeve pipe 1 of can accommodating cutter bar and can be by clamping device 4 fixing cutter bars and connects main sleeve pipe 1 and electric pick housing, main sleeve pipe 1 one ends are connected with joint sleeve 2, clamping device 4 is installed in the other end of main sleeve pipe 1, in order to solve existing electric pick when fixing the cutter bar, the cutter bar can not rotate technical problems such as affecting operation; Described main sleeve pipe 1 one ends pass joint sleeve 2, the other end is rotating to be axially fixed in the joint sleeve 2, and outside joint sleeve 2, be provided with card rotary device 3, this card rotary device 3 includes card and turns sliding sleeve 31, a plurality of ball 32 and back-moving spring 33, be provided with the through hole 21 of accommodating ball 32 at joint sleeve 2 all sidewalls, all sidewalls of main sleeve pipe 1 be positioned at through hole 21 below be provided with the draw-in groove 11 that a plurality of and ball 32 of circular array cooperates; Card turns sliding sleeve 31 and back-moving spring 33 is nested with outside joint sleeve 2, and card pivoted housing pipe 31 can be along joint sleeve 2 horizontal displacement under the driving of back-moving spring 33 and made the ball 32 that places through hole 21 in and draw-in groove 11 fit the first operating position and under external force driver card pivoted housing pipe 31 horizontal displacements of the main sleeve pipe 1 of locking and the second operating position that ball 32 and draw-in groove 11 are separated; Outside joint sleeve 2, add card rotary device 3, in use, ball 32 and draw-in groove 11 on the main sleeve pipe 1 are fitted lock main sleeve pipe 1 thereby utilize back-moving spring 33 driver cards to turn sliding sleeve 31 top nip drum pearls 32; And if needs rotate when cutting a hole bar, turning sliding sleeve 31 horizontal displacements with regard to available hand propelled card makes splenium position, top leave through hole 21 tops, at this moment, rotate main sleeve pipe 1 and ball 32 and draw-in groove 11 are separated realize the rotation of cutter bar, thereby operation is convenient in the adjusting of convenient cutter bar angle.
In the present embodiment, be provided with the first limited step 22 in the described joint sleeve 2, described card turns sliding sleeve 31 and includes and be nested with the passive sliding sleeve 311 outside joint sleeve 2 and be nested with active sliding sleeve 312 outside passive sliding sleeve 311, and the outer wall cross section of passive sliding sleeve 311 and sliding sleeve 312 inner wall sections initiatively are all stepped and complement each other to form synchronous interaction; Outside active sliding sleeve 312, be provided with annular stop boss 3121, back-moving spring 33 1 ends and passive sliding sleeve 311 compress mutually and drive ball 32 and draw-in groove 11 and be affixed to merge and sliding sleeve 312 1 ends and the first limited step 22 push up mutually press spacing, and initiatively sliding sleeve 312 is separated ball 32 and draw-in groove 11 with passive sliding sleeve 311 level of synchronization displacements and can makes positive stop lug boss 3121 and the clamping device 4 of active sliding sleeve 312 compress mutually spacing under external force drives; Be provided with at passive sliding sleeve 311 inwalls and can drive the second limited step 3111, the second limited steps 3111 that ball 32 and draw-in groove 11 compress mutually and form stepped with open-ended inwall; In use as needing to rotate the cutter bar, with regard to initiatively sliding sleeve 312 horizontal displacements of available hand propelled (along Fig. 1 left side slippage), be subjected to active sliding sleeve 312 and the restriction of passive sliding sleeve 311 inside and outside ladders to make passive sliding sleeve 311 synchronous interactions, at this moment, the second limited step 3111 and the ball 32 of passive sliding sleeve 311 is separated and initiatively sliding sleeve 312 1 ends and clamping device 4 fit, prevent that ball 32 from rolling out in through hole 21, rotation cutter bar just can make ball 32 and draw-in groove 11 be separated and realize the angular adjustment of cutter bar like this; After adjusting was finished, back-moving spring 33 just can drive passive sliding sleeve 311 and initiatively sliding sleeve 312 horizontal displacements (along the slippage of Fig. 1 right side), at this moment, locked main sleeve pipe 1 but the second limited step 3111 fits ball 32 and draw-in groove 11 with regard to top nip drum pearl 32; When the second limited step 3111 top is pressed in ball 32 top, initiatively sliding sleeve 312 1 ends can with positive stop lug boss 22 fit form spacing.
In the present embodiment, described passive sliding sleeve 311 is provided with annular boss 3112 with the end that back-moving spring 33 compresses mutually, back-moving spring 33 places in the annular boss 3112, establish annular boss 3112 at passive sliding sleeve 311 1 ends, so just can prevent the horizontal displacement of back-moving spring 33 dislocation impact active sliding sleeves 312 and passive sliding sleeve 311.
In the present embodiment, for guaranteeing the stability of main sleeve pipe 1 when working, described draw-in groove 11 is opening U-shaped shape, the cross section is that the external diameter of arc and ball 32 is complementary, described ball 32 is provided with 2～4, be arranged with the through hole 21 of accommodating ball 32 at the sidewall of joint sleeve 2, draw-in groove 11 is made as opening U-shaped shape, can be beneficial to like this production and processing of draw-in groove 11, and draw-in groove 11 cross sections are made as the arc that is complementary with ball 32, when the second positive stop lug boss 3111 top nip drum pearls 32 of passive sliding sleeve 311, ball 32 and draw-in groove 11 are fitted like this, farthest guarantee the locking firmness of main sleeve pipe 1, prevent that master's sleeve pipe 1 rotates when impacting; And ball 32 is arranged 2～4, and just can utilize ball 32 simultaneously main sleeve pipe 1 to be applied extruding force from the two or four direction, farthest guarantee the locking firmness of main sleeve pipe 1.
In the present embodiment, but described clamping device 4 includes and is nested with outside main sleeve pipe 1 and locking sliding sleeve 41 and locking sliding sleeve 41 synchronous interactions of horizontal sliding and be nested with hand push sliding sleeve 42 and lock dog 43 outside locking sliding sleeve 41, lock dog 43 mobilizable being fixed in the counterbore 12 that connects main sleeve pipe 1 sidewall, back-moving spring 33 1 ends compress mutually with locking sliding sleeve 41, the other end with compressed mutually by movable slider 311, hand push sliding sleeve 42 can drive under external force locking sliding sleeve 41 horizontal displacements and make the first operating position that lock dog 43 and cutter bar square groove be separated and drive the second operating position that locking sliding sleeves 41 are interlocked lock dog 43 and cutter bar square groove at back-moving spring 33; In use as needing to install chisel or cutter shovel, drive locking sliding sleeve 41 horizontal slidings (to the slippage of Fig. 1 right side) with hand propelled hand push sliding sleeve 42, and then will cut a hole bar and insert main sleeve pipe 1 interior top pressure lock dog 43 and make lock dog 43 place the square groove of cutter bar, unclamp again hand push sliding sleeve 42, at this moment, locking sliding sleeve 41 drives hand push sliding sleeve 42 horizontal displacements (to the slippage of Fig. 1 left side) and the top presses lock dog 43 to make the cutter bar be fixed in main sleeve pipe 1 internal locking connection under the effect of back-moving spring 33; Equally, when dismounting cutter bar, also only need to drive locking sliding sleeve 41 horizontal displacements (to the slippage of Fig. 1 right side) with hand propelled hand push sliding sleeve 42 and make lock dog 43 have space to top offset, extract so again the cutter bar and just can make and cut a hole bar and separate dismounting with main sleeve pipe 1.
In the present embodiment, for guaranteeing the degree of being connected firmly of cutter bar and main sleeve pipe 1, described lock dog 43 is provided with two, correspondingly on the inwall of locking sliding sleeve 41 be provided with the groove 411 that an end is opening, lock dog 43 can place in the groove 411 and be separated with the square groove of cutting a hole bar under external force, lock dog 43 is arranged two, and locking sliding sleeve 41 interior arrange two can accommodating lock dog 43 groove 411, like this when driving locking sliding sleeve 41 horizontal slidings (to the slippage of Fig. 1 right side) with hand propelled hand push sliding sleeve 42, the cutter bar inserts just can push up in the main sleeve pipe 1 presses lock dog 43 that lock dog 43 is placed in the groove 411, after the insertion of cutter bar puts in place, lock dog 43 under gravity pressure to bottom offset and snap in the cutter bar square groove in, at this moment, unclamp hand push sliding sleeve 42, back-moving spring 33 just can drive locking sliding sleeve 41 tops and press lock dog 43 that the cutter bar is fixedly connected with main sleeve pipe 1, and makes hand push sliding sleeve 42 1 ends and main sleeve pipe 1 compress mutually spacing; By groove 411 is set, can be convenient to greatly lock dog 43 to top offset, prevent that lock dog 43 breaks away from counterbore 12, guarantees the job stability of lock dog 43.
In the present embodiment, for adversary's sliding cover 42 and initiatively the slippage stroke of sliding sleeve 312 limit, the end of described main sleeve pipe 1 is provided with rubber sleeve 13, hand push sliding sleeve 312 a under external force end pushes up spacing cooperation of pressure mutually with the positive stop lug boss 22 of joint sleeve 2; The other end at back-moving spring 33 effect assistant sliding covers 42 can compress spacing the cooperation mutually with rubber sleeve 13; When needs are installed the cutter bar, hand push sliding sleeve 42 (to Fig. 1 right side) horizontal displacement, when the groove 411 of locking sliding sleeve 41 placed lock dog 43 top, hand push sliding sleeve 42 1 ends compressed spacing with the positive stop lug boss 3121 of active sliding sleeve 312 mutually; After installation, back-moving spring 33 drives locking sliding sleeve 41 tops and presses lock dog 43 and the square groove of cutter bar to compress mutually and make hand push sliding sleeve 42 1 ends and rubber sleeve 13 to fit spacing; When rotating main sleeve pipe 1 such as needs, with initiatively sliding sleeve 312 horizontal displacements of hand propelled (to Fig. 1 left side), when the second limited step 3111 in the passive sliding sleeve 311 during away from ball 32, initiatively the positive stop lug boss 3121 on the sliding sleeve 312 just can fit spacing with hand push sliding sleeve 42 1 ends, at this moment, finish the angular adjustment of main sleeve pipe 1 with regard to rotatable main sleeve pipe 1, after finishing angular adjustment, unclamp initiatively sliding sleeve 312, passive sliding sleeve 311 is (to Fig. 1 right side) horizontal displacement under the driving of back-moving spring 33, after the second limited step 3111 top nip drum pearls 32 fit with draw-in groove 11, initiatively sliding sleeve 312 1 ends just can with joint sleeve 2 on the first limited step 22 compress mutually spacing the cooperation.
Above-described embodiment should not be considered as limitation of the present invention, but any improvement of doing based on spirit of the present invention, all should be within protection scope of the present invention.
Claims (7)
1. rotating chisel chuck assembly, it includes and can also can cut a hole the main sleeve pipe of bar and connect main sleeve pipe and the joint sleeve of electric pick housing by clamping device is fixing by accommodating cutter bar, main sleeve pipe one end is connected with joint sleeve, and clamping device is installed in the other end of main sleeve pipe; It is characterized in that described main sleeve pipe one end passes joint sleeve, the other end is rotating to be axially fixed in the joint sleeve, and outside joint sleeve, be provided with the card rotary device, this card rotary device includes card and turns sliding sleeve, a plurality of ball and back-moving spring, joint sleeve week sidewall be provided with the through hole of accommodating ball, all sidewalls of main sleeve pipe be positioned at through hole below be provided with the draw-in groove that a plurality of and ball of circular array cooperates; Card turns sliding sleeve and back-moving spring is nested with outside joint sleeve, and card pivoted housing pipe can be along the joint sleeve horizontal displacement under the driving of back-moving spring and the ball that places in the through hole and draw-in groove fitted lock the first operating position and the under external force driver card pivoted housing pipe horizontal displacement of main sleeve pipe and make ball and the second operating position that draw-in groove is separated.
2. a kind of rotating chisel chuck assembly as claimed in claim 1, it is characterized in that being provided with in the described joint sleeve the first limited step, described card turns sliding sleeve and includes and be nested with the passive sliding sleeve outside joint sleeve and be nested with active sliding sleeve outside passive sliding sleeve, and the outer wall cross section of passive sliding sleeve and sliding sleeve inner wall section initiatively are all stepped and complement each other to form synchronous interaction; Outside the active sliding sleeve, be provided with the annular stop boss, back-moving spring one end and passive sliding sleeve compress mutually and drive ball and draw-in groove and be affixed to merge and sliding sleeve one end and the first limited step pushed up mutually press spacing, and displacement is separated ball and draw-in groove and can makes positive stop lug boss and the clamping device of active sliding sleeve compress mutually spacing the active sliding sleeve with passive sliding sleeve level of synchronization under external force drives; Be provided with at passive sliding sleeve inwall and can drive the second limited step that ball and draw-in groove compress mutually, the second limited step and open-ended inwall form stepped.
3. a kind of rotating chisel chuck assembly as claimed in claim 2 is characterized in that the end that described passive sliding sleeve and back-moving spring compress mutually is provided with annular boss, and back-moving spring places in the annular boss.
4. a kind of rotating chisel chuck assembly as claimed in claim 3, it is characterized in that described draw-in groove is opening U-shaped shape, the cross section is that the external diameter of arc and ball is complementary, and described ball is provided with 2～4, is arranged with the through hole of accommodating ball at the sidewall of joint sleeve.
5. a kind of rotating chisel chuck assembly as claimed in claim 4, but it is characterized in that described clamping device includes is nested with outside main sleeve pipe and locking sliding sleeve and the locking sliding sleeve synchronous interaction of horizontal sliding and be nested with hand push sliding sleeve and lock dog outside the locking sliding sleeve, lock dog is mobilizable to be fixed in the counterbore that connects main sleeve pipe sidewall, back-moving spring one end compresses mutually with the locking sliding sleeve, the other end with by movable slider pressures that offset, the hand push sliding sleeve can drive under external force the horizontal displacement of locking sliding sleeve and make the first operating position that lock dog and cutter bar square groove be separated and drive the locking sliding sleeve at back-moving spring and make lock dog and second operating position of cutting a hole the bar square groove and being interlocked.
6. a kind of rotating chisel chuck assembly as claimed in claim 5, it is characterized in that described lock dog is provided with two, correspondingly on the inwall of locking sliding sleeve be provided with the groove that an end is opening, lock dog can place in the groove square groove with the cutter bar to be separated under external force.
7. a kind of rotating chisel chuck assembly as claimed in claim 6 is characterized in that the end of described main sleeve pipe is provided with rubber sleeve, and hand push slides over next end of External Force Acting and pushes up mutually spacing cooperation of pressure with the positive stop lug boss of joint sleeve; The other end at action of reset spring assistant sliding cover can compress spacing the cooperation mutually with rubber sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103955994A CN102922492A (en) | 2012-10-08 | 2012-10-08 | Rotatable chisel jacket assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103955994A CN102922492A (en) | 2012-10-08 | 2012-10-08 | Rotatable chisel jacket assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102922492A true CN102922492A (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103955994A Pending CN102922492A (en) | 2012-10-08 | 2012-10-08 | Rotatable chisel jacket assembly |
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| Country | Link |
|---|---|
| CN (1) | CN102922492A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103737559A (en) * | 2014-01-24 | 2014-04-23 | 江苏恒丰电动工具有限公司 | Improved electric pick transmission mechanism |
| CN104526654A (en) * | 2015-01-12 | 2015-04-22 | 方大控股有限公司 | Reducing sleeve for drill bits |
| CN105328643A (en) * | 2015-10-23 | 2016-02-17 | 江苏恒丰电动工具有限公司 | Electric hammer |
| CN106730448A (en) * | 2017-01-20 | 2017-05-31 | 彭辉 | Ram |
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| US4174113A (en) * | 1978-05-08 | 1979-11-13 | Dresser Industries, Inc. | Bit retainer for pneumatic tools |
| US4434859A (en) * | 1981-06-29 | 1984-03-06 | Hilti Aktiengesellschaft | Hammer drill for performing rotary drilling or percussive drilling |
| US5586607A (en) * | 1994-04-25 | 1996-12-24 | Hilti Aktiengesellschaft | Manually operated chipping tool |
| JP2000334681A (en) * | 1999-05-08 | 2000-12-05 | Black & Decker Inc | Rotary hammer |
| EP2283976A2 (en) * | 2009-08-14 | 2011-02-16 | Robert Bosch GmbH | Tool holder device for a hammer drill |
| CN202781071U (en) * | 2012-10-08 | 2013-03-13 | 方大控股有限公司 | Rotatable chisel clamping sleeve assembly |
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| US4131165A (en) * | 1976-04-28 | 1978-12-26 | Robert Bosch Gmbh | Hammer drill |
| US4174113A (en) * | 1978-05-08 | 1979-11-13 | Dresser Industries, Inc. | Bit retainer for pneumatic tools |
| US4434859A (en) * | 1981-06-29 | 1984-03-06 | Hilti Aktiengesellschaft | Hammer drill for performing rotary drilling or percussive drilling |
| US5586607A (en) * | 1994-04-25 | 1996-12-24 | Hilti Aktiengesellschaft | Manually operated chipping tool |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103737559A (en) * | 2014-01-24 | 2014-04-23 | 江苏恒丰电动工具有限公司 | Improved electric pick transmission mechanism |
| CN104526654A (en) * | 2015-01-12 | 2015-04-22 | 方大控股有限公司 | Reducing sleeve for drill bits |
| CN105328643A (en) * | 2015-10-23 | 2016-02-17 | 江苏恒丰电动工具有限公司 | Electric hammer |
| CN105328643B (en) * | 2015-10-23 | 2018-08-24 | 江苏恒丰电动工具有限公司 | A kind of electric hammer |
| CN106730448A (en) * | 2017-01-20 | 2017-05-31 | 彭辉 | Ram |
| CN106730448B (en) * | 2017-01-20 | 2022-04-15 | 彭辉 | Percussion device |
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Application publication date: 20130213 |