JP2012152831A - Impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact tool capable of suppressing an impact caused by movement of a retainer sleeve from being transmitted to a needle holder as much as possible, preventing the needle holder from becoming disengaged from a holder, and preventing the occurrence of disengagement or damage of a locking member.SOLUTION: A first holder 56 is abutted on the locking member 55 fixed to the retainer sleeve 41. A second holder 57 is disposed at a further rear end side than the first holder 56, and the second holder 57 is movable in the axial direction of the retainer sleeve 41 with respect to the retainer sleeve 41. A cushioning member 58 is disposed between the first holder 56 and the second holder 57. A rear end 56A of the first holder 56 is arranged directly opposed to an end face at the tip end side of the second holder 57, and the rear end 56A of the first holder 56 and the end face on the tip end side of the second holder 57 are separated via a prescribed clearance 57a.

Description

  The present invention relates to an impact tool.

  A hitting tool for crushing a work material is conventionally known. The impact tool includes a casing (housing) including a handle portion, a motor housing, and a gear housing, and an electric motor is accommodated in the motor housing. The gear housing has a motion conversion housing and a striking housing 130 as shown in FIG. A motion conversion mechanism (not shown) for converting the rotational motion of an electric motor (not shown) into a reciprocating motion is provided in the motion conversion housing (not shown). In the striking housing 130, a cylinder 140 is provided that extends in a direction orthogonal to the rotation axis of an electric motor (not shown). A tip tool 147 is detachably attached to the left side of FIG.

  The cylinder 140 is provided with a piston (not shown) slidably on the inner periphery thereof. A piston (not shown) reciprocates along the inner periphery of the cylinder 140 by a motion conversion mechanism (not shown). A striking piece 144 is slidably provided on the inner periphery of the cylinder 140 at the tip end side in the cylinder 140. An air chamber (not shown) is defined in the cylinder 140 between a piston (not shown) and the striking element 144, and an intermediate element 146 is disposed on the leading end side, the rear end side, and the leading end side of the striking element 144. Are provided so as to be capable of reciprocating in the left-right direction of FIG. The tip tool 147 is located on the tip side of the intermediate element 146.

  Further, a retainer sleeve 141 is provided in the striking housing 130 on the tip side of the cylinder 140. The axis of the retainer sleeve 141 is arranged in a positional relationship that coincides with the axis of the cylinder 140, and an intermediate element 146 and a tip tool 147 are arranged in the retainer sleeve 141. The meson 146 and the tip tool 147 are slidable with respect to the inner peripheral surface of the retainer sleeve 141, and the tip tool 147 is disposed on the tip side of the meson 146.

  A through hole 141b that penetrates the retainer sleeve 141 in the radial direction is formed in a part of the retainer sleeve 141, and a needle 151 is disposed in the through hole 141b. The needle 151 is movable in the radial direction of the retainer sleeve 141 in the through hole 141b. A needle holder 152 is mounted on the retainer sleeve 141. The needle holder 152 is movable in the axial direction of the retainer sleeve 141, and by the movement, the movement of the retainer sleeve 141 in the radial direction in the through hole 141 b of the needle 151 is restricted or the restriction is released. It is configured. When the movement is restricted, a part of the needle 151 protrudes inward in the radial direction of the retainer sleeve 141 from the inner peripheral surface of the retainer sleeve 141, and this portion is a groove 147 a formed on the side surface of the tip tool 147. And the tip tool 147 cannot be removed from the impact tool. When the movement of the needle 151 is not restricted, the tip tool 147 can be removed from the impact tool. The distal end of the needle holder 152 can be brought into contact with a locking member 155 that is fixed to the outer peripheral surface of the retainer sleeve 141, and the needle holder 152 cannot move to the distal end side as compared with the contacted state. It is configured.

  The needle holder 152 is provided with a grip 154 provided around the needle holder 152. The grip 154 is fixed by being fitted to the needle holder 152, and is movable integrally with the needle holder 152 in the axial direction of the retainer sleeve 141. A spring 153 is provided between the grip 154 and the striking housing 130. The front end of the spring 153 is in contact with the grip 154, and the rear end of the spring 153 is in contact with the striking housing 130.

  The rear end portion of the retainer sleeve 141 has a flange-shaped portion 141 </ b> C, and the flange-shaped portion 141 </ b> C is disposed to face a rear step portion 132 </ b> C provided in the striking housing 130. A first buffer member 148 is disposed between the flange-shaped portion 141C and the rear step portion 132C. The retainer sleeve 141 has an axially facing portion 141D that can contact the tip portion 132D of the striking housing 130 at a substantially central position in the axial direction.

  A rotational driving force of an electric motor (not shown) is transmitted to a motion conversion mechanism (not shown), and a piston (not shown) is reciprocated in the cylinder 140 by a motion conversion mechanism (not shown). By the reciprocating motion of a piston (not shown), the pressure of the air in the air chamber repeatedly rises and falls, giving a striking force to the striking element 144. The striking element 144 moves forward and collides with the rear end of the intermediate element 146, and the striking force is transmitted to the tip tool 147 through the intermediate element 146. As a result, the work material is crushed. Such an impact tool is described in, for example, Japanese Patent Application Laid-Open No. 2007-237304 (Patent Document 1).

JP 2007-237304 A

  When the tip tool 147 is not in contact with the work material and no load is applied to the tip tool 147, a so-called idle driving state is obtained. In the idle driving state, the reciprocating intermediate element 146 collides with the tip tool 147 and the retainer sleeve 141. Due to this impact, the retainer sleeve 141 compresses the first buffer member 148 and moves to the distal end side. Then, as shown in FIG. 7, when the axially facing portion 141 </ b> D collides with the tip portion 132 </ b> D of the striking housing 130, the retainer sleeve 141 is returned to the rear end side.

  At this time, the impact due to the movement of the retainer sleeve 141 is transmitted to the needle holder 152 via the locking member 155 fixed to the retainer sleeve 141, and the fitting between the needle holder 152 and the grip 154 is released, or the locking member 155 may come off or be damaged.

  Therefore, the present invention suppresses the impact caused by the movement of the retainer sleeve from being transmitted to the needle holder as much as possible, and prevents the fitting between the needle holder and the holder from being removed or the locking member from being detached or damaged. An object of the present invention is to provide a striking tool that can be used.

  In order to achieve the above object, the present invention has a housing having a housing cylindrical portion and a substantially cylindrical shape. The housing cylindrical portion is coaxially disposed in the housing cylindrical portion and penetrates in the radial direction. A retainer sleeve formed with a through-hole, slidably supporting the tip tool and the intermediate element with respect to the inner peripheral surface, and slidable on the inner peripheral surface of the housing cylindrical portion in the axial direction of the housing cylindrical portion; A needle disposed so as to be movable in the radial direction of the retainer sleeve in the through-hole, and slidable with respect to the outer peripheral surface of the retainer sleeve in the axial direction of the retainer sleeve, and in contact with the needle A movement restricting position for restricting movement of the needle in the radial direction of the retainer sleeve, and allowing movement of the needle in the radial direction of the retainer sleeve apart from the needle A needle holder movable between the movement allowable position, one end abutting the needle holder and the other end abutting a part of the housing cylindrical portion, and the needle holder is moved from the movement allowable position to the movement restriction A compression spring urging in the direction toward the position, a power generation unit supported by the housing, and power for transmitting the power transmitted from the power generation unit to the meson and causing the meson to collide with the tip tool A retainer sleeve, the retainer sleeve having a first axially facing portion that faces a part of the housing tubular portion in one axial direction of the retainer sleeve, and the first axially facing portion A first buffer member is provided between the cylindrical portion of the housing and the first holder, the movement of which is restricted relative to the retainer sleeve, and the first holder in the one axial direction of the retainer sleeve A second holder facing the needle holder so as to come into contact with the needle holder in the other axial direction of the retainer sleeve; and a second buffer member sandwiched between the first holder and the second holder. Blow tools are provided.

  The retainer sleeve has a first axial facing portion that faces a part of the housing tubular portion in one axial direction of the retainer sleeve, and the first sleeve is disposed between the first axial facing portion and the housing tubular portion. A first holder provided with one buffer member and restricted in movement with respect to the retainer sleeve; and a needle holder facing the first holder in one direction in the axial direction of the retainer sleeve and in the other direction in the axial direction of the retainer sleeve And a second buffer member sandwiched between the first holder and the second holder so that the tip tool is not in contact with the work material during so-called idle driving, The first shock-absorbing member can buffer the impact of the first impact member that collides with the retainer sleeve and the impact that the tip tool collides with the needle.

  Further, when the retainer sleeve attempts to return to the original position by the elastic force of the first buffer member, the second buffer member is compressed by the first holder and the second holder, and the impact of the retainer sleeve is transmitted to the needle holder. That can be suppressed. For this reason, it can suppress that a needle holder is exposed by an impact, and when the grip is being fixed to the needle holder by fitting, it can prevent that the fitting will be canceled. Further, it is possible to prevent other parts fixed to the retainer sleeve from being damaged or detached from the retainer sleeve.

  Here, the first holder has a second holder contactable portion that directly faces the second holder so as to be able to contact the second holder, and between the second holder contactable portion and the second holder, It is preferable that a gap having a width equal to an amount that is elastically compressed to such an extent that the second buffer member can be maintained for a predetermined life without being plastically deformed.

  The first holder has a second holder contactable portion that directly faces the second holder so as to be able to contact the second holder, and the second buffer member is plastic between the second holder contactable portion and the second holder. Since a gap having a width equal to the amount that is elastically compressed to such an extent that the buffer function can be maintained for a predetermined life without deformation is formed, even if the second buffer member is compressed by the first holder and the second holder, The second buffer member can be prevented from being crushed and the buffer function cannot be exhibited, and the buffer function can be maintained in the second buffer member for a predetermined life.

  Further, the retainer sleeve has a second axial facing portion that faces a part of the housing tubular portion in one axial direction of the retainer sleeve, and the second axial facing portion and the housing tube. It is preferable that a gap having a width equal to an amount that is elastically compressed to such an extent that the buffering function can be maintained for a predetermined life without plastic deformation of the first buffering member is formed between the first and second parts.

  The retainer sleeve has a second axial facing portion that faces a part of the housing cylindrical portion in one direction in the axial direction of the retainer sleeve, and between the second axial facing portion and the housing cylindrical portion. A gap having a width equal to the amount that is elastically compressed to such an extent that the buffering function can be maintained for a predetermined life without plastic deformation of the first buffering member is formed. Even if compressed by the biaxially facing portion, the first buffer member can be prevented from being crushed and unable to exhibit the buffer function, and the buffer function can be maintained in the first buffer member for a predetermined life.

  As described above, the present invention suppresses as much as possible that the impact due to the movement of the retainer sleeve is transmitted to the needle holder, and prevents the fitting between the needle holder and the holder from being removed and the locking member from being detached or damaged. An impact tool that can be provided can be provided.

The perspective view which shows the impact tool by embodiment of this invention. The principal part sectional view showing the hitting housing of the hitting tool by an embodiment of the invention. The principal part sectional drawing which shows the front-end | tip part of the impact tool by embodiment of this invention. The principal part sectional drawing which shows the state which the intermediate | middle collided with the retainer sleeve in the front-end | tip part of the impact tool by embodiment of this invention. Sectional drawing along the VV line of FIG. The principal part sectional drawing which shows the front-end | tip part of the conventional impact tool. The principal part sectional drawing which shows the state which the intermediate | middle collided with the retainer sleeve in the front-end | tip part of the conventional impact tool.

  An embodiment of an impact tool according to the present invention will be described with reference to FIGS. First, the left front side in FIG. 1 is defined as the front end side of the impact tool 1, and the right side is defined as the rear end side of the impact tool 1. The direction from the rear end side to the front end side corresponds to one direction, and the opposite direction corresponds to the other direction. Further, the upper side in FIG. 1 is defined as the upper side of the impact tool 1 and the lower side is defined as the lower side of the impact tool 1 and will be described below. The striking tool 1 includes a casing (housing) including a handle portion 10, a motor housing 20, and a gear housing 30 that are connected to each other.

  A power cable 11 is attached to the handle portion 10 and a switch mechanism (not shown) is built therein. A trigger 13 that can be operated by a user is mechanically connected to a switch mechanism (not shown). The power cable 11 can connect a switch mechanism (not shown) to an external power source (not shown), and an operator operates the trigger 13 to connect an electric motor 21 (described later) and an external power source (not shown). Or disconnect. In addition, the handle portion 10 has a grip portion 14 that is gripped when an operator uses the impact tool 1.

  The motor housing 20 is provided at the lower end on the front end side of the handle portion 10. The electric motor 21 (FIG. 2) is housed in the motor housing 20. The electric motor 21 corresponds to a power generation unit, and includes an output shaft 22 that outputs the rotational driving force. A pinion gear 23 is provided at the tip of the output shaft 22, and the pinion gear 23 is located in the gear housing 30.

  The gear housing 30 includes a motion conversion housing 31 and a striking housing 32. The motion conversion housing 31 is connected to the upper portion of the motor housing 20, and the rear end thereof is connected to the handle portion 10. The striking housing 32 is connected to the tip of the striking housing 32.

  A crankshaft 34 extending in parallel with the output shaft 22 is rotatably supported in the motion conversion housing 31 on the rear end side of the pinion gear 23. A first gear 35 that meshes with the pinion gear 23 is fixed coaxially with the crankshaft 34 at a lower portion of the crankshaft 34. A motion conversion mechanism 36 is provided at the upper end of the crankshaft 34. The motion conversion mechanism 36 includes a crank weight 37, a crank pin 38, and a connecting rod 39. The crank weight 37 is fixed to the upper end of the crankshaft 34. The crank pin 38 is fixed to the end of the crank weight 37 in the radial direction of the crank shaft 34. The crankpin 38 is inserted into a hole formed in the rear end portion of the connecting rod 39.

  The striking housing 32 has a substantially cylindrical outer frame member 32A and a substantially cylindrical front cover 32B, and corresponds to a housing cylindrical portion. The outer frame member 32A and the front cover 32B are arranged so that the positions of the axial centers coincide with each other, and the front cover 32B is connected to the distal end portion of the outer frame member 32A. A cylinder 40 extending in a direction orthogonal to the output shaft 22 is provided in the outer frame member 32A. The central axis of the cylinder 40 and the rotation axis of the output shaft 22 are located on the same plane. Further, the rear end portion of the cylinder 40 faces the output shaft 22 of the electric motor 21 in the vertical direction. A piston 43 is provided in the cylinder 40 so as to be slidable on the inner periphery of the cylinder 40. The piston 43 has a piston pin 43 </ b> A, and the piston pin 43 </ b> A is inserted into the hole at the tip of the connecting rod 39. A striking piece 44 is slidably provided on the inner periphery of the cylinder 40 at the tip end side in the cylinder 40. An air chamber 45 is defined in the cylinder 40 and between the piston 43 and the striker 44. The members from the first gear 35 to the striker 44 that transmit the power of the electric motor 21 from the pinion gear 23 to the below-described intermediate element 46 correspond to a power transmission unit.

  A portion of the front cover 32B that is connected to the outer frame member 32A is provided with a rear step 32C that protrudes inward of the front cover 32B. In addition, a front step portion 32D that protrudes inward of the front cover 32B is provided at the front end portion of the front cover 32B.

  A retainer sleeve 41 is provided in the front cover 32B. The retainer sleeve 41 and the cylinder 40 are disposed in a positional relationship in which the respective axes coincide with each other, and an intermediate element 46 and a tip tool 47 are disposed in the retainer sleeve 41. More specifically, as shown in FIG. 3, the retainer sleeve 41 has a large-diameter portion 41A having a large outer diameter and inner diameter as a portion on the rear end side, and a contraction with a small outer diameter and inner diameter as a portion on the front end side. It has a diameter portion 41B. The tip tool 47 is arranged in the reduced diameter portion 41B, and the intermediate element 46 is mainly arranged in the enlarged diameter portion 41A. The intermediate element 46 and the tip tool 47 are slidable with respect to the inner peripheral surface of the retainer sleeve 41. The retainer sleeve 41 is slidable in the axial direction of the retainer sleeve 41 with respect to the inner peripheral surface of the front cover 32B.

  The rear end portion of the retainer sleeve 41 has a flange-like portion 41C. The flange-like portion 41C is located on the rear end side with respect to the rear step portion 32C of the front cover 32B, and is disposed opposite to the rear step portion 32C. A first buffer member 48 is disposed between the flange-like portion 41C and the rear step portion 32C. The flange-like portion 41C corresponds to the first axially facing portion.

  A second axially facing portion 41D is provided in a portion of the retainer sleeve 41 that is closer to the tip than the portion of the reduced diameter portion 41B connected to the enlarged diameter portion 41A. The second axially facing portion 41D includes a step portion provided on the outer peripheral surface of the retainer sleeve 41 and protruding outward from the retainer sleeve 41, and is disposed on the rear end side of the front step portion 32D of the front cover 32B. . The second axially facing portion 41D is opposed to the front step portion 32D of the front cover 32B via a gap 41a having a predetermined width in the axial direction of the front cover 32B. The gap 41a having the predetermined width is provided as a buffer function without the plastic deformation of the first buffer member 48 when the first buffer member 48 is elastically compressed by the flange-shaped portion 41C and the rear step portion 32C as will be described later. Has a width that can be maintained for a predetermined lifetime.

  A through hole 41b that penetrates the retainer sleeve 41 in the radial direction is formed in the reduced diameter portion 41B of the retainer sleeve 41, and a needle 51 is disposed in the through hole 41b. The needle 51 is movable in the radial direction of the retainer sleeve 41 in the through hole 41b. The retainer sleeve 41 is provided with a needle holder 52 provided around the retainer sleeve 41. The needle holder 52 is movable in the axial direction of the retainer sleeve 41, and the movement restricts the movement of the retainer sleeve 41 in the radial direction in the through hole 41b of the needle 51, or the restriction is released. It is configured. The position of the needle holder 52 when the movement is restricted corresponds to a movement restriction position, and the position of the needle holder 52 when the restriction is released corresponds to a movement allowable position.

  When the movement is restricted, a part of the needle 51 protrudes inward in the radial direction of the retainer sleeve 41 from the inner peripheral surface of the retainer sleeve 41, and this portion is a groove 47 a formed on the side surface of the tip tool 47. Is engaged. As a result, the tip tool 47 cannot be removed from the impact tool 1. When the movement of the needle 51 is not restricted, the needle 51 can be detached from the groove 47 a, and thus the tip tool 47 can be detached from the impact tool 1.

  A spring 53 made of a compression spring is provided between the needle holder 52 and the front cover 32B. The front end of the spring 53 is in contact with the needle holder 52, and the rear end of the spring 53 is in contact with a part of the front cover 32B. With this configuration, the needle holder 52 is urged toward the distal end side. Further, the needle holder 52 is provided with a grip 54 provided around the needle holder 52. The grip 54 is fixed to the needle holder 52 by being fitted to the needle holder 52, and is movable in the axial direction of the retainer sleeve 41 integrally with the needle holder 52.

  A locking member 55 is fixed to the outer peripheral surface of the retainer sleeve 41 at a portion that is a part of the retainer sleeve 41 and on the front end side of the needle holder 52, and the locking member 55 and the needle holder 52 are provided. A first holder 56, a second holder 57, and a second buffer member 58 are provided between the first holder 56 and the second buffer member 58. The first holder 56 is in contact with the locking member 55 on the rear end side of the locking member 55, and has a substantially L shape when viewed in a cross section including the axis of the retainer sleeve 41 as shown in FIG. Therefore, the retainer sleeve 41 is mounted.

  The second holder 57 has a plate-like ring shape and is provided with the retainer sleeve 41. The second holder 57 is arranged on the rear end side of the first holder 56 and moves relative to the retainer sleeve 41 in the axial direction of the retainer sleeve 41. Is possible. The second buffer member 58 is disposed between the first holder 56 and the second holder 57, and is one of the retainer sleeve 41 and the first holder 56 while being sandwiched between the first holder 56 and the second holder 57. The part is wrapped around. By mounting a part of the first holder 56, the second buffer member 58 is arranged more outward in the radial direction of the retainer sleeve 41. For this reason, the cross-sectional area of the 2nd buffer member 58 in the cross section cut by the surface orthogonal to the axial center of the retainer sleeve 41 can be enlarged more.

  The rear end 56A of the first holder 56 is disposed directly opposite to the end face on the front end side of the second holder 57, and the rear end 56A of the first holder 56 and the end face on the front end side of the second holder 57 have a predetermined gap. It is separated via 57a. The predetermined gap 57a has a predetermined buffering function without the plastic deformation of the second buffer member 58 when the second buffer member 58 is elastically compressed by the first holder 56 and the second holder 57 as will be described later. It has a width that can be maintained during its lifetime. The rear end 56A of the first holder 56 corresponds to a second holder contactable portion.

  A substantially annular tip cover 59 is provided at the tip of the retainer sleeve 41 so as to cover the tip of the retainer sleeve 41. A cover step portion 59A is provided on the outer peripheral surface of the tip cover 59, and the tip of the grip 54 can come into contact with the cover step portion 59A. When no force is applied to the grip 54 from the outside, the tip of the grip 54 is in contact with the cover step portion 59 </ b> A by the biasing force of the spring 53.

  Next, operation | movement of the impact tool 1 by this Embodiment is demonstrated. First, in a state where the handle portion 10 is gripped by hand, the tip tool 47 is pressed against a work material (not shown). Next, the trigger 13 is pulled, and electric power is supplied to the electric motor 21 to rotate it. This rotational driving force is transmitted to the crankshaft 34 via the pinion gear 23 and the first gear 35. The rotation of the crankshaft 34 is converted into a reciprocating motion of the piston 43 in the cylinder 40 by the motion conversion mechanism 36 (crank weight 37, crankpin 38, and connecting rod 39). Due to the reciprocating motion of the piston 43, the pressure of the air in the air chamber 45 repeatedly rises and falls, giving a striking force to the striking element 44. The striking element 44 moves forward and collides with the rear end of the intermediate element 46, and the striking force is transmitted to the tip tool 47 (not shown) via the intermediate element 46.

  When the tip tool 47 is separated from the work material, a so-called idle driving state is obtained. At this time, the intermediate piece 46 is a part of the inner peripheral surface of the retainer sleeve 41 and vigorously collides with the rear end face of the reduced diameter portion 41 </ b> B, and the tip tool 47 collides with the needle 51 vigorously. As a result, the retainer sleeve 41 slightly moves relative to the striking housing 32 toward the distal end side. At this time, the first buffer member 48 is elastically compressed by the flange-like portion 41C and the rear step portion 32C of the retainer sleeve 41 from the state shown in FIG. 3, and the retainer sleeve 41 is opposed to the second axial direction as shown in FIG. The portion 41D gently collides with the front step portion 32D of the front cover 32B.

  Then, the first buffer member 48 moves to the rear end side of the flange-like portion 41C of the retainer sleeve 41 in an attempt to return to the original state by the elastic force of the first buffer member 48. At this time, the second holder 57 is pressed relative to the retainer sleeve 41 toward the distal end by the needle holder 52 biased by the spring 53 toward the distal end, and the first holder 56 and the second holder 57 The second buffer member 58 is elastically compressed. Then, the rear end 56A of the first holder 56 and the end face on the front end side of the second holder 57 gently collide.

  Thus, the retainer sleeve 41 has the flange-shaped portion 41C, and the first buffer member 48 is provided between the flange-shaped portion 41C and the rear stepped portion 32C, and the movement of the retainer sleeve 41 is restricted with respect to the retainer sleeve 41. The first holder 56 is sandwiched between the first holder 56, the second holder 57, the second holder 57 facing the first holder 56 in the front end direction and facing the needle holder 52 in the rear end direction. Since the second shock absorbing member 58 is provided, the impact that the intermediate piece 46 collides with the retainer sleeve 41 and the impact that the tip tool 47 collides with the needle 51 during the blanking operation in which the tip tool 47 is not in contact with the work material are the first. It can be buffered by the buffer member 48.

Further, when the retainer sleeve 41 tries to return to the original position by the elastic force of the first buffer member 48, the second buffer member 58 is compressed by the first holder 56 and the second holder 57, and the impact of the retainer sleeve 41 is applied. Transmission to the needle holder 52 can be suppressed. For this reason, it can suppress that the needle holder 52 is exposed by an impact, and when the grip 54 is being fixed to the needle holder 52 by fitting, it can prevent that the said fitting will be cancelled | released. . Further, it is possible to prevent other components fixed to the retainer sleeve 41 from being damaged or detached from the retainer sleeve 41.
.

  Further, between the rear end 56A of the first holder 56 and the end face on the front end side of the second holder 57, the second buffer member 58 is elastically compressed to such an extent that the buffer function can be maintained for a predetermined life without plastic deformation. Since the gap 57a having a width equal to the amount to be formed is formed, even if the second buffer member 58 is compressed by the first holder 56 and the second holder 57, the second buffer member 58 is crushed and exhibits a buffer function. It is possible to prevent the situation from being impossible, and the buffer function can be maintained in the second buffer member 58 for a predetermined lifetime.

  The retainer sleeve 41 has a second axially facing portion 41D. Between the second axially facing portion 41D and the front step portion 32D, the first cushioning member 48 has a predetermined buffering function without plastic deformation. Since the gap 41a having a width equal to the amount that is elastically compressed to the extent that it can be maintained for the lifetime, the first buffering member 48 is compressed by the rear stepped portion 32C and the flange-like portion 41C. The member 48 can be prevented from being crushed and the buffer function cannot be exhibited, and the buffer function can be maintained in the first buffer member 48 for a predetermined lifetime.

  The impact tool of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, although the gaps 41a and 57a are formed in the present embodiment, only one of the gaps 41a and 57a may be formed, or the gap may not be formed.

  Moreover, the shape of the 1st buffer member 48, the 1st holder 56, the 2nd holder 57, and the 2nd buffer member 58 is not limited to the shape of this Embodiment.

  The striking tool of the present invention is particularly useful in the field of striking tools having a configuration in which the tip tool and the intermediate element slide in the retainer sleeve and the tip tool is struck by the intermediate element.

DESCRIPTION OF SYMBOLS 1 ... Blow tool 10 ... Handle part 20 ... Motor housing 30 ... Gear housing 21 ... Electric motor 22 ... Output shaft 31 ... Motion conversion housing 32 ... Blow housing 36 ... Motion conversion mechanism 32A ... Outer frame member 32B ... Front cover 40 ... Cylinder 32C ... Rear step part 32D ... Front step part 41 ... Retainer sleeve 46 ... Meson 46 47 ... Tip tool 41C ... Flange-like portion 48 ... First shock absorbing member 41D ... Second axially facing portion 41a ... Gap 41b ... Through hole 51 ... Needle 52 ... Needle holder 53 ... Spring 56 ... First holder 57 ... Second holder 58 ... Second buffer member 57a ... Gap

Claims (3)

A housing having a housing tubular portion;
It has a substantially cylindrical shape, and is coaxially arranged in the housing cylindrical portion and has a through hole that penetrates in the radial direction so that the tip tool and the intermediate element can slide on the inner peripheral surface. A retainer sleeve that supports and is slidable on the inner peripheral surface of the housing tubular portion in the axial direction of the housing tubular portion;
A needle disposed in the through hole so as to be movable in a radial direction of the retainer sleeve;
A movement restricting position that is slidable with respect to the outer peripheral surface of the retainer sleeve in the axial direction of the retainer sleeve and that abuts on the needle and restricts the movement of the retainer sleeve in the radial direction; and the needle A needle holder movable between and a movement allowance position that allows movement of the needle in a radial direction of the retainer sleeve away from
A compression spring that has one end abutting against the needle holder and the other end abutting against a part of the housing tubular portion, and biasing the needle holder in a direction from the movement allowable position toward the movement restricting position;
A power generator supported by the housing;
A power transmission unit that transmits the power transmitted from the power generation unit to the meson and causes the meson to collide with the tip tool; and
The retainer sleeve has a first axial facing portion that faces a part of the housing tubular portion in one axial direction of the retainer sleeve, and the first axial facing portion, the housing tubular portion, A first buffer member is provided between the
A first holder that is restricted in movement relative to the retainer sleeve; and the needle holder that faces the first holder in the one direction in the axial direction of the retainer sleeve and in the other direction in the axial direction of the retainer sleeve. A striking tool comprising: a second holder that is opposed to be in contact with the first holder; and a second buffer member sandwiched between the first holder and the second holder.   The first holder has a second holder contactable portion that directly faces the second holder so as to be able to contact the second holder, and the first holder is disposed between the second holder contactable portion and the second holder. 2. The impact tool according to claim 1, wherein a gap having a width equal to an amount that is elastically compressed to such an extent that the cushioning function can be maintained for a predetermined life without plastic deformation. The retainer sleeve has a second axially facing portion that faces a part of the housing tubular portion in one direction in the axial direction of the retainer sleeve,
Between the second axially opposed portion and the housing tubular portion, the width of the first buffer member is equal to an amount that is elastically compressed to such an extent that the buffering function can be maintained for a predetermined life without plastic deformation. The striking tool according to claim 1, wherein a gap is formed.

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