EP2085190A1 - Outil à percussion - Google Patents

Outil à percussion Download PDF

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Publication number
EP2085190A1
EP2085190A1 EP07832324A EP07832324A EP2085190A1 EP 2085190 A1 EP2085190 A1 EP 2085190A1 EP 07832324 A EP07832324 A EP 07832324A EP 07832324 A EP07832324 A EP 07832324A EP 2085190 A1 EP2085190 A1 EP 2085190A1
Authority
EP
European Patent Office
Prior art keywords
bit
holding
tool
region
holding region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07832324A
Other languages
German (de)
English (en)
Other versions
EP2085190B1 (fr
EP2085190A4 (fr
Inventor
Toshiro Hirayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Makita Corp filed Critical Makita Corp
Publication of EP2085190A1 publication Critical patent/EP2085190A1/fr
Publication of EP2085190A4 publication Critical patent/EP2085190A4/fr
Application granted granted Critical
Publication of EP2085190B1 publication Critical patent/EP2085190B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/42—Steel

Definitions

  • the present invention relates to an impact tool that performs a predetermined operation on a workpiece by a striking movement of a tool bit in its axial direction.
  • a shank of a hammer bit is held by a tool holder so as to be movable in an axial direction.
  • a slight clearance large enough to allow insertion of the shank is provided between an inner wall surface of a bit holding hole of the tool holder and an outer surface of the shank of the hammer bit inserted into the bit holding hole. Therefore, during hammering or hammer drill operation on a workpiece such as concrete, concrete dust generated by the operation adheres to the outer surface of the shank of the hammer bit and enters the above-described clearance. The hammer bit then moves with respect to the tool holder with the dust existing therebetween.
  • WO02/20224 discloses an impact tool having a tool holder designed to resist wear.
  • a sleeve made of a material harder than a body of the tool holder is provided as a separate member and press-fitted into the body in order to reduce wear of the inner wall surface of the bit holding hole.
  • an impact tool is configured such that steel balls arranged on the tool holder prevent removal of a hammer bit inserted into a bit holding hole of a tool holder. Therefore, an axial impact force is applied from the hammer bit to the tool holder via the steel balls during striking movement of the hammer bit. Accordingly, in the above-described known technique in which a hard sleeve is formed along the entire length of the bit holding hole into which a shank of the hammer bit is inserted, the sleeve is acted upon by an impact force.
  • the sleeve made of a hard material however may crack on impact due to its high hardness.
  • slots in which the steel balls are disposed are formed through the sleeve in the radial direction. It is however difficult to form the slots by machining because the sleeve is hard. Therefore, in the known impact tool, further improvements are required in durability and machinability.
  • an object of the invention to provide an effective technique for improving the durability and machinability of a tool holder for holding a tool bit in an impact tool.
  • the present invention provides an impact tool which includes a tool holder having a bit holding hole. A tool bit is inserted into the bit holding hole and the tool bit is held so as to be movable in an axial direction to perform a predetermined operation on a workpiece at least by striking movement of the tool bit in an axial direction.
  • the manner "at least by striking movement of the tool bit in an axial direction” here includes the manner of driving the tool bit only by striking movement, and the manner of driving the tool bit by combination of striking movement and rotation.
  • the impact tool according to this invention is characterized in that the tool holder has a bit holding region which is held in contact with an outer surface of the tool bit inserted into the bit holding hole and which holds the tool bit such that the tool bit can move in the axial direction.
  • the bit holding region has a first holding region, a second holding region and a third holding region, arranged in this order in the bit holding hole from the side of a bit insertion opening toward the far side from the opening.
  • the first holding region is provided as a region for holding the tool bit inserted into the bit holding hole, while allowing the tool bit to move in the axial direction with respect to the bit holding hole.
  • the second holding region is provided as a region to dispose a removal preventing member which engages with the tool bit and thereby prevents the tool bit from becoming slipped out of the bit holding hole.
  • the third holding region is provided as a region for holding an inserted end of the tool bit inserted into the bit holding hole, while allowing it to move in the axial direction with respect to the bit holding hole.
  • the hardness of the first holding region is higher than that of the second holding region.
  • the "hardness of the first holding region” is preferably set to a hardness of 60 Rockwell Hardness C-Scale (HRC) or higher, and the first holding region is suitably formed of alloy tool steels (SKD), high speed tool steels (SKH) or high-carbon chrome bearing steels (SUJ).
  • the first holding region on the bit insertion opening side where wear most easily occurs has a higher hardness than the second holding region, so that wear resistance of the first holding region can be increased.
  • wear of the first holding region can be reduced and its durability can be increased.
  • Wear of the bit holding region causes runout of the tool bit. Then, for example, in the case of a hammer drill, in which the rotating force of the tool holder is transmitted to the tool bit, torque transmitting projections formed on the tool holder may suffer wear.
  • a removal preventing member for example, steel balls
  • the regions other than the first holding region preferably have as high a hardness as in a conventional technique.
  • the second holding region in which the removal preventing member is disposed can preferably have as high a hardness as in a conventional technique. Therefore, cracks which might be produced due to too high hardness can be prevented from being produced on impact during striking movement of the hammer bit. Moreover, the machinability in forming a radial through hole for receiving the removal preventing member in the second holding region, for example, by machining, is not impaired because the hardness of the second holding region can preferably be as high as in a conventional technique.
  • the hardness of the third holding region is higher than that of the second holding region.
  • the "hardness of the third holding region" is equal to that of the first holding region.
  • the first holding region of the first and third holding regions is formed of a material having a higher hardness than the second holding region and as a separate member.
  • the "separate member" in this invention typically represents a ring-like member.
  • the manner of being “formed” here typically represents the manner in which the ring-like member is press-fitted into the bore of the tool holder, but it also suitably includes manners other than press-fitting, such as fixing by screws or by welding.
  • the bit holding hole having the bit holding region of different hardnesses in the axial direction can be easily produced by forming the first holding region as a separate member, so that ease of production can be enhanced.
  • the removal preventing member in the second holding region prevents removal of the tool bit by moving in a radially inward direction of the bit holding hole and engaging with the tool bit, and allows removal of the tool bit by moving in a radially outward direction of the bit holding hole.
  • an opening is formed in the second holding region and the removal preventing member is disposed in the opening so as to be movable in the radial direction.
  • the opening in which the removal preventing member is disposed is formed in the second holding region having a lower hardness than the first holding region. Therefore, the opening can be easily formed, for example, by machining, and thus the machinability can be increased.
  • an effective technique for improving the durability and machinability of a tool holder for holding a tool bit in an impact tool is provided.
  • FIG. 1 is a sectional side view showing an entire electric hammer drill 101 according to this embodiment.
  • the hammer drill 101 mainly includes a body 103 that forms an outer shell of the hammer drill 101, a hammer bit 119 detachably coupled to the tip end region (on the left side as viewed in FIG. 1 ) of the body 103 via a tool holder 137, and a grip 109 connected to the body 103 on the side opposite to the hammer bit 119 and designed to be held by a user.
  • the hammer bit 119 is mounted such that it is allowed to reciprocate with respect to the tool holder 137 in its axial direction and prevented from rotating with respect to the tool holder in its circumferential direction.
  • the hammer bit 119 is a feature that corresponds to the "tool bit" according to the present invention.
  • the side of the hammer bit 119 is taken as the front side and the side of the grip 109 as the rear side.
  • the body 103 mainly includes a motor housing 105 that houses a driving motor 111, and a gear housing 107 that houses a motion converting mechanism 113, a power transmitting mechanism 114 and a striking mechanism 115.
  • the motor housing 105 and the gear housing 107 are connected together, for example, by screws (not shown)
  • the rotating output of the driving motor 111 is appropriately converted into linear motion via the motion converting mechanism 113 and transmitted to the striking mechanism 115. Then, an impact force is generated in the axial direction of the hammer bit 119 via the striking mechanism 115. Further, the power transmitting mechanism 114 appropriately reduces the speed of the rotating output of the driving motor 111 and then transmits the rotating output as a rotating force to the hammer bit 119. As a result, the hammer bit 119 is caused to rotate in the circumferential direction.
  • the driving motor 111 is driven when a trigger 117 on the grip 109 is depressed.
  • the motion converting mechanism 113 mainly includes a driving gear 121 that is disposed on a tip end (front end) of an armature shaft 112 of the driving motor 111 and rotated in a vertical plane by the driving motor 111, a driven gear 123 that engages with the driving gear 121, a rotating element 127 that rotates together with the driven gear 123 via an intermediate shaft 125, a swash plate 129 that is caused to swing in the axial direction of the hammer bit 119 by rotation of the rotating element 127, and a cylindrical piston 141 that is caused to reciprocate by swinging movement of the swash plate 129.
  • the intermediate shaft 125 is arranged parallel (horizontally) to the axial direction of the hammer bit 119.
  • the outer surface of the rotating element 127 that is fitted onto the intermediate shaft 125 is inclined at a predetermined angle with respect to the axis of the intermediate shaft 125.
  • the swash plate 129 is fitted on the inclined outer surface of the rotating element 127 via a ball bearing 126 such that it can rotate with respect to the rotating element 127.
  • the swash plate 129 is caused to swing in the axial direction of the hammer bit 119 by rotation of the rotating element 127.
  • the swash plate 129 has a swinging rod 128 extending upward (in the radial direction) from the swash plate 129.
  • the swinging rod 128 is connected to a rear end of the cylindrical piston 141 via a connecting shaft 124 such that it can rotate with respect to the piston 141.
  • the cylindrical piston 141 is slidably disposed within a sleeve 135 that is disposed within the gear housing 107, and the rear end of the bore of the piston is closed.
  • the power transmitting mechanism 114 mainly includes a first transmission gear 131 that is caused to rotate in a vertical plane by the driving motor 111 via the driving gear 121 and the intermediate shaft 125, a second transmission gear 133 that engages with the first transmission gear 131, a sleeve 135 that is caused to rotate together with the second transmission gear 133, and a tool holder 137 that is caused to rotate together with the sleeve 135 in a vertical plane.
  • the striking element 115 mainly includes the cylindrical piston 141, a striker 143 slidably disposed within the bore of the cylindrical piston 141, and an impact bolt 145 that is slidably disposed within the tool holder 137 and serves to transmit the kinetic energy of the striker 143 to the hammer bit 119.
  • the driving gear 121 is caused to rotate in a vertical plane by the rotating output of the driving motor 111.
  • the rotating element 127 is caused to rotate in a vertical plane via the driven gear 123 that engages with the driving gear 121 and via the intermediate shaft 125.
  • the swash plate 129 and the swinging rod 128 are then caused to swing in the axial direction of the hammer bit 119, which in turn causes the cylindrical piston 141 to slide linearly.
  • the striker 143 is then caused to linearly move within the piston 141 by pressure fluctuations of air or the action of an air spring within an air chamber 141a of the cylindrical piston 141 as a result of the sliding movement of the piston 141.
  • the striker 143 then collides with the impact bolt 145 and transmits the kinetic energy to the hammer bit 119.
  • the sleeve 135 When the first transmission gear 131 rotates together with the intermediate shaft 125, the sleeve 135 is caused to rotate in a vertical plane via the second transmission gear 133 that engages with the first transmission gear 131. Further, the tool holder 137 and the hammer bit 119 supported by the tool holder 137 rotate together with the sleeve 135. Thus, the hammer bit 119 performs a drilling operation on a workpiece (concrete) by a hammering movement in the axial direction and a drilling movement in the circumferential direction.
  • the hammer drill 101 can be switched between a hammer drill mode in which the hammer bit 119 is caused to perform a hammering movement and a drilling movement as described above and a drill mode in which the hammer bit 119 is caused to perform only a drilling movement.
  • a mechanism for such mode changing is not directly related to this invention and therefore will not be described.
  • the bit holding mechanism 151 for holding the hammer bit 119 inserted into the tool holder 137 is described with reference to FIGS. 2 and 3 .
  • the bit holding mechanism 151 mainly includes the tool holder 137 having a bit holding hole 137a which has a circular section and into which a shank 119a of the hammer bit 119 is removably inserted, an engagement member in the form of a plurality of steel balls 153 which prevent or allow removal of the hammer bit 119 inserted into the bit holding hole 137a, and a tool sleeve 155 that switches the steel balls 153 between a bit removal preventing position and a bit removal allowing position.
  • the tool holder 137 has a bit holding part 137A through which the bit holding hole 137a is formed in the axial direction and an impact bolt housing part 137B in which a space for housing the impact bolt 145 is formed.
  • the impact bolt housing part 137B is integrally formed with the bit holding part 137A on its rear in the axial direction.
  • the impact bolt housing part 137B is connected to the above-described sleeve 135 so that the tool holder 137 rotates together with the sleeve 135.
  • the tool holder 137 and the sleeve 135 may be formed in one piece.
  • the bit holding part 137A of the tool holder 137 is a feature that corresponds to the "bit holding region" according to this invention.
  • the bit holding hole 137a has an open front end as a bit insertion opening and a rear end open to the space of the impact bolt housing part 137B.
  • a plurality of slots 137b are formed through the bit holding part 137A of the tool holder 137 in the radial direction.
  • the slots 137b have a predetermined length extending in the axial direction of the bit holding part 137A and are arranged at predetermined intervals in the circumferential direction of the bit holding part 137A.
  • the steel balls 153 are each disposed in the associated slots 137b. Each of the steel balls 153 can move in the associated slot 137b in the axial direction and can be moved (displaced) in the radial direction of the bit holding part 137A.
  • the slot 137b is a feature that corresponds to the "opening" according to this invention.
  • the tool sleeve 155 is fitted on the bit holding part 137A such that it can move in the axial direction of the hammer bit.
  • a stopper ring 157 for preventing the steel balls 153 from being displaced radially outward is fitted in the inside of the tool sleeve 155 on the bit holding part 137A.
  • a stopper plate 159 is disposed on the rear of the stopper ring 157 such that it can move in the axial direction of the tool sleeve 155 with respect to the tool sleeve 155.
  • the stopper plate 159 is pressed against a rear surface of the stopper ring 157 by a biasing spring 161 disposed between the tool sleeve 155 and the bit holding part 137A.
  • the biasing force of the biasing spring 161 acts as a force of pushing the tool sleeve 155 forward. Therefore, the tool sleeve 155 is normally held in a position in which its front end is in contact with a cap 163 fitted over a front end portion of the bit holding part 137A, or in a bit removal preventing position.
  • the engagement groove 119b of the hammer bit 119 has a predetermined length extending in the axial direction.
  • a plurality of radially extending projections 137c are formed as a torque transmitting part on the inner surface of the bit holding hole 137a of the bit holding part 137A and arranged at predetermined intervals in the circumferential direction.
  • the torque transmitting projections 137c have a predetermined length extending in the axial direction of the bit holding part 137A and fitted (engaged) in torque transmission grooves 119c (see FIG. 3 ) formed in the outer surface of the shank 119a of the hammer bit 119 which is inserted into the bit holding hole 137a. In this state, the rotating force of the bit holding part 137A is transmitted to the hammer bit 119.
  • the torque transmission grooves 119c are open to a rear end of the shaft 119a such that they are used to position the hammer bit 119 in the circumferential direction when inserting the hammer bit 119 into the bit holding hole 137a.
  • the bit holding mechanism 151 holds the hammer bit 119 in the bit holding hole 137a of the tool holder 137 while allowing the hammer bit 119 to move in the axial direction.
  • the tool sleeve 155 In order to remove the hammer bit 119 from the bit holding part 137A, the tool sleeve 155 is moved to the rear bit removal allowing position against the biasing force of the biasing spring 161. As a result, the stopper ring 157 is released from the steel balls 153, so that the steel balls 153 are no longer prevented from moving radially outward. In this state, when the hammer bit 119 is pulled forward, the steel balls 153 are pushed radially outward. Therefore, the hammer bit 119 can be removed from the bit holding hole 137a.
  • Holding rings 165, 167 are press-fitted into the bit holding part 137A of the tool holder 137 on the bit insertion opening side of the bit holding hole 137a and on the far side of the bit holding hole 137a in the bit inserting direction or the side adjacent to the impact bolt housing part 137B, respectively.
  • the holding rings 165, 167 are formed of materials having a higher hardness than the bit holding part 137A, such as alloy tool steels (SKD), high speed tool steels (SKH) and high-carbon chrome bearing steels (SUJ), having a hardness of 60 Rockwell Hardness C-Scale (HRC) or higher.
  • the holding ring 165 on the bit insertion opening side is provided as a region for holding the hammer bit 119 inserted into the bit holding hole 137a, while allowing the hammer bit 119 to move in the axial direction with respect to the bit holding hole 137a.
  • the holding ring 167 on the far side in the bit inserting direction is provided as a region for holding an inserted end of the hammer bit 119 inserted into the bit holding hole 137a, while allowing it to move in the axial direction with respect to the bit holding hole 137a.
  • a region between the two holding rings 165, 167 is provided as a region to dispose a mechanism for preventing removal of the hammer bit 119 and a mechanism for transmitting a rotational driving force of the tool holder 137 to the hammer bit 119.
  • the hardnesses of a bit insertion opening side inner wall surface 165a and a far side inner wall surface 167a are higher than that of an intermediate inner wall surface 166a between the bit insertion opening side inner wall surface 165a and the far side inner wall surface 167a.
  • the bit insertion opening side inner wall surface 165a, the far side inner wall surface 167a and the intermediate inner wall surface 166a are features that correspond to the "first holding region", the "third holding region” and the "second holding region", respectively, according to this invention.
  • the hammer drill 101 is thus constructed.
  • the bit insertion opening side inner wall surface 165a is located in an environment in which wear most easily occurs because dust generated during operation easily enters it.
  • the bit insertion opening side inner wall surface 165a susceptible to wear is formed by the holding ring 165 having a higher hardness (of 60 Rockwell Hardness C-Scale (HRC) or higher), so that wear resistance of the bit insertion opening side inner wall surface 165a is increased.
  • HRC Rockwell Hardness C-Scale
  • the hammer bit 119 when the hammer bit 119 performs a striking movement during operation, the hammer bit 119 is acted upon not only by a reaction force from the workpiece in the axial direction, but by an external force including a radial component in a radial direction transverse to the axial direction.
  • the inner wall surface of the bit holding hole 137a supports this transverse force acting upon the hammer bit 119 mainly on the bit insertion opening side inner wall surface 165a and the far side inner wall surface 167a.
  • portions that are subjected to the above-described transverse force, or the bit insertion opening side inner wall surface 165a and the far side inner wall surface 167a, are formed by the holding rings 165, 167 having a higher hardness.
  • the bit insertion opening side inner wall surface 165a and the far side inner wall surface 167a which are subjected to higher load can have a higher durability, so that wear of the inner wall surfaces 165a, 167a can be reduced in a rational
  • Wear of the inner wall surface of the bit holding hole 137a may cause runout of the hammer bit 119. Then, particularly in the case of the hammer drill 101, in which the rotating force of the tool holder 137 is transmitted to the hammer bit 119, the torque transmitting projections 137c formed on the tool holder 137 may suffer wear. As a result, drilling or other operation may become difficult due to the runout of the hammer bit 119.
  • the inner wall surface of the bit holding hole 137a is formed by a sleeve having a higher hardness along its entire axial length
  • an axial impact force which acts upon a front end region (left end region as viewed in FIG. 2 ) of the slots 137b of the bit holding part 137A via the steel balls 153 during striking movement of the hammer bit 119 may produce cracks in the bit holding part 137A in the vicinity of the front end region due to its higher hardness.
  • the machinability in forming the slots 137b of the bit holding part 137A by machining may be reduced.
  • the bit holding part 137A forming the intermediate inner wall surface 166a can have as high a hardness as in a conventional technique. Therefore, the above-described problems of cracks and reduction in machinability can be solved. Further, in this embodiment, the bit holding hole 137a having the inner wall surface of different hardnesses can be easily produced by press-fitting the holding rings 165, 167 having a higher hardness than the bit holding part 137A, into the bit holding hole 137a on the bit insertion opening side and on the far side, respectively.
  • the holding rings 165, 167 are described as being provided in the bit holding hole 137a on the bit insertion opening side and on the far side, respectively, it may be changed such that the holding ring 165 is provided only on the bit insertion opening side. Further, the holding rings 165, 167 may be fixed by means other than press fitting, such as by welding and by using screws. Further, in this embodiment, the electric hammer drill is described as a representative example of the impact tool, but the present invention can also be applied to an electric hammer in which the hammer bit 119 performs only the hammering operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Electrophonic Musical Instruments (AREA)
EP07832324A 2006-11-22 2007-11-21 Outil à percussion Not-in-force EP2085190B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006316087A JP2008126378A (ja) 2006-11-22 2006-11-22 打撃工具
PCT/JP2007/072594 WO2008062851A1 (fr) 2006-11-22 2007-11-21 Outil à percussion

Publications (3)

Publication Number Publication Date
EP2085190A1 true EP2085190A1 (fr) 2009-08-05
EP2085190A4 EP2085190A4 (fr) 2011-02-16
EP2085190B1 EP2085190B1 (fr) 2012-02-01

Family

ID=39429782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07832324A Not-in-force EP2085190B1 (fr) 2006-11-22 2007-11-21 Outil à percussion

Country Status (4)

Country Link
EP (1) EP2085190B1 (fr)
JP (1) JP2008126378A (fr)
AT (1) ATE543613T1 (fr)
WO (1) WO2008062851A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4597262B1 (ja) * 2010-04-15 2010-12-15 正義 嶋本 先端工具付スライドハンマー
US8068011B1 (en) 2010-08-27 2011-11-29 Q Street, LLC System and method for interactive user-directed interfacing between handheld devices and RFID media
DE102020213165A1 (de) * 2020-10-19 2022-04-21 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine mit einer Verriegelungseinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168324A (en) * 1963-02-15 1965-02-02 Ingersoll Rand Co Chuck
US4332300A (en) * 1979-06-14 1982-06-01 Rensselear Polytechnic Institute Pneumatic hammer nozzle seal
JPS62150077U (fr) * 1986-03-14 1987-09-22
DE9320653U1 (de) * 1993-10-28 1995-02-23 Robert Bosch Gmbh, 70469 Stuttgart Werkzeugaufnahme an Handwerkzeugmaschinen für Schlagbohrwerkzeuge
EP0737550A1 (fr) * 1995-04-14 1996-10-16 Hyup Sung Heavy Industries Co. Ltd. Marteau à percussion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3637354A1 (de) * 1986-11-03 1988-05-05 Bosch Gmbh Robert Werkzeughalter
FR2692187B1 (fr) * 1992-06-16 1997-06-20 Montabert Ets Dispositif de maintien de l'outil d'un brise roche hydraulique.
JPH07299767A (ja) * 1994-04-28 1995-11-14 Hitachi Koki Co Ltd 打撃工具
DE10044387A1 (de) 2000-09-08 2002-04-04 Bosch Gmbh Robert Werkzeughalterung für eine Handwerkzeugmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168324A (en) * 1963-02-15 1965-02-02 Ingersoll Rand Co Chuck
US4332300A (en) * 1979-06-14 1982-06-01 Rensselear Polytechnic Institute Pneumatic hammer nozzle seal
JPS62150077U (fr) * 1986-03-14 1987-09-22
DE9320653U1 (de) * 1993-10-28 1995-02-23 Robert Bosch Gmbh, 70469 Stuttgart Werkzeugaufnahme an Handwerkzeugmaschinen für Schlagbohrwerkzeuge
EP0737550A1 (fr) * 1995-04-14 1996-10-16 Hyup Sung Heavy Industries Co. Ltd. Marteau à percussion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008062851A1 *

Also Published As

Publication number Publication date
ATE543613T1 (de) 2012-02-15
EP2085190B1 (fr) 2012-02-01
WO2008062851A1 (fr) 2008-05-29
EP2085190A4 (fr) 2011-02-16
JP2008126378A (ja) 2008-06-05

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