JP5376247B2 - Impact tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact tool which can lessen an operation load of an operator at the time of changing an angle of a tip tool and has a simple structure. <P>SOLUTION: In the impact tool, 12 pieces ribs 51A are arranged on an outer peripheral surface of a rear end side of a front cover in a circumferential direction of the front cover at an equal interval so as to make the ribs face in an axial direction of the front cover in parallel. Sleeve ribs regularly connected with a guide grooves 51a are arranged on an inner peripheral surface of a sleeve. The front end of the sleeve has 12 crests regulated with an inclined surface and projecting to the front end side. Rotary member ribs 54A used for connecting and disconnecting with the guide grooves 51a are arranged on an inner peripheral surface of a rotary member. A rear end of the rotary member has 12 crests regulated with the inclined surface and projecting at the rear end side. The rotary member is urged to the rear end side with a spring. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a striking tool, and more particularly to a striking tool to which a tip tool having a substantially flat portion such as a cutter or a scoop is attached.

  Conventionally, a hitting tool to which a tip tool having a substantially flat portion such as a cutter or a scoop is attached is known. In order to generate a striking force, the striking tool has a motor, a cylinder, a piston disposed in the cylinder, a motion conversion mechanism for converting the rotational force of the motor into a reciprocating motion of the piston, and a striking element driven by the piston. And a meson which the striker collides with. A tip tool is attached to the tip of the impact tool, and the impact force is transmitted to the tip tool via the intermediate element when the impact element collides with the intermediate element.

  In the impact tool, the tip tool is held by a retainer sleeve, and the retainer sleeve can rotate integrally with the tip tool about the axis of the tip tool with respect to the housing of the impact tool. The tip tool is not removed from the retainer sleeve by the needle whose position is regulated by the needle holder. A substantially flat portion such as a cutter or a scoop is rotated by the user of the impact tool so as to form a desired angle around the axis of the tip tool, and is fixed at the angle. Such an impact tool is described in, for example, JP-A-10-225879 (Patent Document 1), British Patent 2276578 (Patent Document 2), and British Patent 2276579 (Patent Document 3). Has been.

JP-A-10-225879 GB Patent No. 2276578 British Patent No. 2276579

  In the hitting tool described in the above publication, the grip is provided so as to be movable in the axial direction of the tip tool, and a subbling is provided between the needle holder and the grip. The retainer sleeve and grip can be rotated by moving the grip in the axial direction of the tip tool against the urging force of the spring, and the angle of the tip tool can be manually rotated by the impact tool user. It was configured to be variable.

  In this configuration, in order to change the angle of the tip tool, two actions are required such as maintaining the grip moved in the axial direction of the tip tool against the biasing force of the spring and rotating the grip. The operator's operation burden when changing the angle was heavy.

  Moreover, in the impact tool described in Patent Document 1, by rotating the grip, the spring is tightened with a substantially cylindrical holder in which the spring is disposed to face the inner peripheral surface of the spring. This constitutes a one-way clutch, and it is necessary to adjust the distance between the outer peripheral surface of the holder and the inner peripheral surface of the spring with high accuracy, and the manufacturing process is complicated.

  Therefore, an object of the present invention is to provide a striking tool with a simple operation and a small operation burden on the operator when changing the angle of the tip tool.

  In order to achieve the above object, the present invention comprises a retainer sleeve having a substantially cylindrical shape and an inner peripheral surface that supports the tip tool and is capable of rotating integrally with the tip tool about the axis of the tip tool, and a substantially cylindrical shape. A front cover that rotatably supports the retainer sleeve, a rotatable position that is supported by the front cover and that can rotate integrally with the retainer sleeve relative to the front cover, and the rotation in the axial direction of the tip tool. A rotation member that is aligned with the position and that is not rotatable with respect to the front cover, and a rotation member that is movable between the rotation position and the rotation position that is in contact with the rotation member. A spring that urges the rotating member in a direction toward the front, and can be brought into contact with one end of the rotating member, can move in the axial direction of the tip tool, and cannot rotate with respect to the front cover. Supported by And a rotating means for rotating the rotating member relative to the sleeve by the biasing force of the spring when the rotating member is moved to the rotatable position by the movement of the sleeve. Blow tools are provided.

  It has a substantially cylindrical shape and the inner peripheral surface supports the tip tool and can be rotated integrally with the tip tool around the axis of the tip tool. The retainer sleeve is supported by the front cover and can rotate integrally with the retainer sleeve with respect to the front cover. A rotatable member that is movable between a rotatable position and a non-rotatable position that is aligned with the rotatable position in the axial direction of the tip tool and cannot rotate with respect to the front cover, A spring that urges the rotating member in a direction from the rotatable position toward the non-rotatable position, and can contact one end of the rotating member, move in the axial direction of the tip tool, and rotate with respect to the front cover When the sleeve is supported by the front cover and the rotating member is moved to the rotatable position by the movement of the sleeve, the rotating member is rotated with respect to the sleeve by the biasing force of the spring. Because having a rotating means for, only the rotating member one action such moving sleeve in the axial direction of the tool bit, the retainer sleeve, and a tip tool can be rotated about the axis of the tool bit. For this reason, the user's operativity of a striking tool can be improved, and the operation burden to the user at the time of operation can be reduced.

  Here, each of the rotating member and the sleeve has a substantially cylindrical shape, and the front cover is inserted therethrough. A plurality of ribs extending in the axial direction of the tip tool are formed on the outer peripheral surface of the front cover. Provided at a predetermined interval in the circumferential direction of the cover, a guide groove is formed between the ribs, and a sleeve rib that is always engaged with the guide groove is provided on the inner peripheral surface of the sleeve. The surface is provided with a rotating member rib that engages with the guide groove when the rotating member is in the non-rotatable position and is disengaged from the guide groove when the rotating member is in the rotatable position. The rotating means is provided at an end of each rib in a direction from the non-rotatable position to the rotatable position, and a rib inclined surface that intersects the circumferential direction at the same first predetermined angle, Direction from the rotatable position to the non-rotatable position Provided at the end of each of the rotating member ribs, provided at the rotating member rib inclined surface substantially parallel to the rib inclined surface, and at the end of the sleeve on the side in contact with the rotating member, A sleeve end inclined surface that intersects at a second predetermined angle with respect to the direction and inclines in the same direction as the rib inclined surface; and an end of the rotating member that is in contact with the sleeve, and the sleeve end A rotating member end inclined surface that is parallel to the inclined surface and abuts against the sleeve end inclined surface, and the sleeve end inclined surface and the rotating member end inclined surface by a biasing force of the spring. Are always in contact, and when the rotating member is in the rotatable position, it is preferable that the rotating member end inclined surface slides with respect to the sleeve end inclined surface by the biasing force of the spring.

  Each of the rotating member and the sleeve has a substantially cylindrical shape, and a front cover is inserted therethrough. On the outer peripheral surface of the front cover, a plurality of ribs extending in the axial direction of the tip tool are provided at predetermined intervals in the circumferential direction of the front cover. A guide groove is provided between the ribs, and a sleeve rib that is always engaged with the guide groove is provided on the inner peripheral surface of the sleeve. The rotary member is in a non-rotatable position on the inner peripheral surface of the rotary member. Sometimes a rotating member rib that engages with the guide groove and is out of the guide groove when the rotating member is in the rotatable position is provided, and the rotating means is configured to move each rib in the direction from the non-rotatable position to the rotatable position. Rib inclined surfaces provided at the ends and intersecting each other at the same first predetermined angle with respect to the circumferential direction, and provided at the ends of the rotating member ribs in the direction from the rotatable position to the non-rotatable position. Abbreviated on inclined surface Rotating member rib inclined surface and sleeve end portion provided at the end of the sleeve abutting on the rotating member and intersecting the circumferential direction at a second predetermined angle and inclining in the same direction as the rib inclined surface An inclined surface and a rotating member end inclined surface provided at an end of the rotating member on the side in contact with the sleeve, parallel to the inclined end surface of the sleeve, and in contact with the inclined end surface of the sleeve; The sleeve end inclined surface and the rotating member end inclined surface are always in contact with each other by the biasing force of the spring, and when the rotating member is in the rotatable position, the rotating member end inclined surface is Since it slides with respect to the part inclined surface, it is not necessary to make the configuration for rotating the tip tool in the impact tool complicated, and complicated adjustment can be made unnecessary in this configuration. For this reason, the cost concerning manufacture of an impact tool can be aimed at.

  A long groove extending in the axial direction of the tip tool is formed on the peripheral surface of the tip tool, and a portion of the retainer sleeve that can be opposed to the long groove penetrates the retainer sleeve in the radial direction of the retainer sleeve. A through hole is formed, and a needle is provided in the through hole so as to be movable in a radial direction of the retainer sleeve. When the needle moves inward in a radial direction of the retainer sleeve, the needle A restriction position that is engageable with the long groove and is provided on the outer peripheral surface of the retainer sleeve, and restricts movement of the needle to maintain the engagement state of the needle with the long groove; and restriction of movement of the needle The needle holder is movable between the movable position where the needle is movable and the other end of the spring abuts the needle holder. It is preferred to bias to maintain the Doruhoruda the restricting position.

  A long groove extending in the axial direction of the tip tool is formed in the peripheral surface of the tip tool, and a through hole that penetrates the retainer sleeve in the radial direction of the retainer sleeve is formed in a portion of the retainer sleeve that can face the long groove. A needle is provided in the hole so as to be movable in the radial direction of the retainer sleeve. It is possible to move between the restriction position where the movement of the needle is restricted and the engagement state of the needle with the long groove is maintained, and the movable position where the restriction of the needle movement is released and the needle can move A needle holder, the other end of the spring abuts the needle holder, and the spring biases the needle holder so as to maintain it in a restricted position. Both the needle holder and the pivot member at one spring can be biased and it is possible to reduce the number of parts of the impact tool.

  Moreover, it is preferable that this rib is provided in the surrounding surface of this front cover over the perimeter. Since ribs are provided on the entire circumference of the front cover, when the tip tool has a desired rotation angle, the tip is at the same angle as the desired rotation angle or an angle close to the desired rotation angle. The rotating member, the retainer sleeve, and the tip tool can be fixed to be non-rotatable at the angle as the tool is rotated.

  As described above, the present invention can provide a striking tool with a simple operation and a small operation burden on the operator when changing the angle of the tip tool.

The perspective view which shows the impact tool by embodiment of this invention. The principal part sectional drawing which shows the impact tool by embodiment of this invention. The principal part sectional drawing which shows the impact tool by embodiment of this invention. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. The side view which shows the front cover of the impact tool by embodiment of this invention. It is a figure which shows the rotation member of the impact tool by embodiment of this invention, (a) is sectional drawing, (b) is a rear view. It is a figure which shows the sleeve of the impact tool by embodiment of this invention, (a) is a front view, (b) is sectional drawing. The conceptual diagram which shows the positional relationship of a rotation member rib and a guide groove when the rotation member of the impact tool by embodiment of this invention exists in a non-rotatable position. The principal part sectional drawing which shows the impact tool by embodiment of this invention. The conceptual diagram which shows the positional relationship of a rotation member and a sleeve when the rotation member of the impact tool by embodiment of this invention exists in a non-rotatable position. The conceptual diagram which shows the positional relationship of a rotation member and a sleeve when the rotation member of the impact tool by embodiment of this invention exists in a rotatable position. The conceptual diagram which shows the positional relationship of a rotation member rib and a guide groove when the rotation member of the impact tool by embodiment of this invention exists in a rotatable position.

  An embodiment of an impact tool according to the present invention will be described with reference to FIGS. The impact tool 1 includes a main handle 10, a sub handle 110, a housing including a motor housing 20 and a gear housing 30, and a tool holding unit 50 for attaching the tip tool 2. In the following description, the left side in FIGS. 1 and 2 is defined as the front end side of the impact tool 1, the right side is defined as the rear end side of the impact tool 1, and the upper side in FIGS. 1 and 2 is defined as the upper side and the lower side of the impact tool 1. The description will be made by defining the lower side of the tool 1.

  As shown in FIG. 1, the main handle 10 is provided at the rear end of the housing. The main handle 10 is provided with a power cable 11 and a switch mechanism (not shown). A trigger 13 that can be operated by a user is mechanically connected to a switch mechanism (not shown). When the user of the impact tool 1 operates the trigger 13, connection / disconnection between an electric motor 21 (FIG. 2) described later and an external power source (not shown) connected to the power cable 11 can be switched.

  Further, the main handle 10 has an upper end portion and a lower end portion, and the upper end portion is connected to a rear portion of a motion conversion housing 31 described later. The lower end portion is connected to the rear portion of the motor housing 20. The sub handle 110 has a grip portion 111, and the grip portion 111 is connected to the distal end portion of the gear housing 30.

  An electric motor 21 (FIG. 2) is accommodated in the motor housing 20. The electric motor 21 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.

  The gear housing 30 includes a motion conversion housing 31 and a striking housing 32. The motion conversion housing 31 is located in the upper part of the motor housing 20. The striking housing 32 is located on the distal end side of the motion converting housing 31.

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

  A cylinder 40 extending in a direction orthogonal to the output shaft 22 is provided in the striking housing 32. The axis of the cylinder 40 and the axis of the output shaft 22 are located on the same plane. The rear end portion of the cylinder 40 is located above the electric motor 21. A piston 43 is provided in the cylinder 40 so as to be slidable on the inner peripheral surface of the cylinder 40. The piston 43 has a piston pin 43A, and the tip of a connecting rod 39 is fixed to the piston pin 43A. A striker 44 is slidably provided on the inner peripheral surface of the cylinder 40 in the cylinder 40 and on the tip side of the piston 43. An air chamber 45 is defined in the cylinder 40 and between the piston 43 and the striker 44. Further, an intermediate element 46 is provided in the front end side of the striker 44 so as to be slidable in the front-rear direction in the cylinder 40. The tool holding unit 50 is provided on the tip side of the cylinder 40, and the tip tool 2 is detachably attached to the tool holding unit 50.

  The tool holding unit 50 includes a front cover 51 and a retainer sleeve 52. The front cover 51 is provided on the distal end side of the impact housing 32 and is fixed to the impact housing 32 coaxially with the cylinder 40. The retainer sleeve 52 is provided radially inward of the front cover 51 and has a substantially cylindrical shape. The retainer sleeve 52 is provided so as to be rotatable with respect to the front cover 51 about the axis of the front cover 51, and the distal end side portion of the retainer sleeve 52 protrudes further toward the front end side than the front end of the front cover 51. Yes.

  As shown in FIGS. 4 and 5, a plurality of ribs 51 </ b> A are provided on the outer peripheral surface on the front end side of the front cover 51. Twelve ribs 51 </ b> A are provided, and the longitudinal directions thereof are parallel to the axial direction of the front cover 51, and are arranged at equal intervals in the circumferential direction of the front cover 51. For this reason, the structure which the guide groove 51a was formed between the rib 51A and the rib 51A is comprised. The rear ends of the ribs 51A are connected to each other in the circumferential direction of the front cover 51, and the rear ends of the guide grooves 51a are dead ends by this connected portion.

  The leading ends of the ribs 51A are in a positional relationship that coincides with each other in the axial direction of the front cover 51, and the leading end surfaces of the ribs 51A form rib inclined surfaces 51B. The rib inclined surfaces 51B are inclined toward the rear end side so as to intersect at about 45 ° with respect to the circumferential direction of the front cover 51, respectively. This angle of approximately 45 ° corresponds to the first predetermined angle.

  As shown in FIG. 3 and the like, a sleeve 53 is provided on the outer peripheral surface of the front cover 51 facing the rib 51 </ b> A in the radial direction of the front cover 51. The sleeve 53 has a substantially cylindrical shape and is provided with a front cover 51. As shown in FIG. 7, four sleeve ribs 53 </ b> A having substantially the same width as the guide groove 51 a are provided on the inner peripheral surface of the sleeve 53 at equal intervals in the circumferential direction of the sleeve 53. The sleeve rib 53A is always engaged with the guide groove 51a, and the sleeve 53 slides in the axial direction of the front cover 51 with respect to the front cover 51 by the sleeve rib 53A being guided in the guide groove 51a. It is configured. Further, since the sleeve rib 53A is always engaged with the guide groove 51a, the sleeve 53 cannot always rotate around the axis of the front cover 51.

  The distal end portion of the sleeve 53 has twelve peak portions 53B that protrude toward the distal end side over the entire circumference in the circumferential direction. Each of the crests 53B has an inclined surface 53C that inclines toward the rear end so as to intersect with one direction in the circumferential direction of the sleeve 53 at approximately 30 °, and a direction opposite to the one direction in the circumferential direction of the sleeve 53. Is defined by an inclined surface 53D that inclines toward the rear end so as to intersect at approximately 30 °, and a valley portion is formed between the mountain portion 53B and the mountain portion 53B. Therefore, the tip part of the sleeve 53 has a jagged shape due to the peak part 53B and the valley part. This approximately 30 ° angle corresponds to a second predetermined angle. The slope 53D corresponds to the sleeve end slope.

  In addition, a rotating member 54 is provided on the outer peripheral surface of the front cover 51 that can face the tip of the rib 51A. As shown in FIG. 6, the rotating member 54 has a substantially cylindrical shape and is provided with a front cover 51 (FIG. 3). Further, the distal end portion of the rotating member 54 protrudes further toward the distal end side than the distal end of the front cover 51 and is fixed to a retainer sleeve 52 described later. The rotating member 54 and a retainer sleeve 52 to be described later can be integrally rotated about the axis of the front cover 51.

  Four rotating member ribs 54 </ b> A having substantially the same width as the width of the guide groove 51 a in the circumferential direction are provided on the inner peripheral surface of the rotating member 54 at equal intervals in the circumferential direction of the sleeve 53. The rotating member rib 54A can be engaged with a portion on the distal end side of the guide groove 51a, and the rotating member rib 54A is guided to the guide groove 51a in the engaged state as shown in FIG. When 54 is slid with respect to the front cover 51 toward the front end in the axial direction of the front cover 51, the rotating member rib 54A is removed from the front end portion of the guide groove 51a as shown in FIG. Has been. The position of the rotation member 54 when the rotation member rib 54A is engaged with the guide groove 51a corresponds to a non-rotatable position, and the rotation member 54 when the rotation member rib 54A is detached from the guide groove 51a. The position corresponds to a rotatable position. Therefore, the non-rotatable position and the rotatable position are aligned in the axial direction of the tip tool 2 described later. The rear end surface of the rotating member rib 54A has a rotating member rib inclined surface 54E. The rotating member rib inclined surface 54E is parallel to a rib inclined surface 51B facing in the axial direction of the tip tool 2 to be described later so as to intersect with the circumferential direction of the front cover 51 at approximately 45 °. Inclined to the side.

  The rear end portion of the rotating member 54 can be brought into contact with the front end portion of the sleeve 53 and has twelve peak portions 54B protruding toward the rear end side. A valley portion is formed between the mountain portion 54B and the mountain portion 54B, and the shapes of the mountain portion 54B and the valley portion coincide with the shapes of the valley portion and the mountain portion 53B of the sleeve 53. However, when the rotating member 54 is in a non-rotatable position and is in contact with the distal end portion of the sleeve 53, as shown in FIG. The portion 54 </ b> B is not in a completely matched state, and the rotating member 54 is configured to be slightly rotated with respect to the sleeve 53. The mountain portion 54B is defined by slopes 54C and 54D. The inclined surface 54C corresponds to the inclined surface of the rotating member end. The rib inclined surface 51B, the rotating member rib inclined surface 54E, the inclined surface 53D, and the inclined surface 54C correspond to rotating means.

  As shown in FIG. 3, a through-hole 52 a is formed in a portion of the retainer sleeve 52 that protrudes further to the front end side than the front end of the front cover 51. A needle 55 is disposed in the through hole 52a, and the needle 55 is movable in the radial direction of the retainer sleeve 52 in the through hole 52a. A needle holder 56 is provided at a position on the outer peripheral surface of the retainer sleeve 52 that can face the through hole 52a. The need holder 56 is slidable in the axial direction of the retainer sleeve 52 with respect to the outer peripheral surface of the retainer sleeve 52, the sliding portion 56 </ b> A that slides, and an inner diameter enlarged portion 56 </ b> B that is separated from the outer peripheral surface of the retainer sleeve 52. And have. The needle 55 can move in the radial direction of the retainer sleeve 52 when the needle holder 56 slides and the inner diameter enlarged portion 56B is in a positional relationship facing the through hole 52a. When the needle holder 56 slides and the sliding portion 56 </ b> A is in a positional relationship facing the through hole 52 a, the needle 55 cannot move in the radial direction of the retainer sleeve 52. When it becomes impossible to move, the needle 55 engages with a long groove 2 a of the tip tool 2 described later, and the tip tool 2 cannot be removed from the impact tool 1.

  A spring 57 is provided between the need holder 56 and the rotating member 54. The front end of the spring 57 is in contact with the need holder 56 and the rear end is in contact with the front end portion of the rotating member 54. The spring 57 urges the rotating member 54 to move to the rear end side and urges the need holder 56 to move to the front end side.

  The tip tool 2 attached to the impact tool 1 is, for example, a scoop as shown in FIG. 1, and has a flat portion 2B having a plane substantially parallel to the axis of the handle 2A at the tip of the handle 2A. The rear end of the handle 2A can be inserted into the retainer sleeve 52 through the opening of the tip of the retainer sleeve 52 of the striking tool 1 and into the striking tool 1. The handle 2A extends in the axial direction of the handle 2A. A long groove 2a is formed. The axial center of the handle 2A, the axial center of the front cover 51, the axial center of the retainer sleeve 52, the axial center of the rotating member 54, and the axial center of the sleeve 53 are in the same positional relationship.

  Next, the operation of rotating the tip tool 2 about the axis of the handle 2A in the impact tool 1 will be described. First, the user of the striking tool 1 moves the sleeve 53 positioned closer to the rear end side by the biasing force of the spring 57 to the front end side. As a result, the rotating member 54 in contact with the sleeve 53 moves to the distal end side, and when reaching the rotatable position, the rotating member rib 54A comes off the guide groove 51a. Then, as shown in FIG. 10, the rotating member 54 rotates in the opposite direction to the rotation from the state where the rotating member 54 is slightly rotated with respect to the sleeve 53 at the non-rotatable position as described above, as shown in FIG. The valley 53B and the valley 54B of the rotating member 54 are completely aligned with the peak 53B and valley of the sleeve 53.

  Thereafter, when the user of the impact tool 1 releases his / her hand from the sleeve 53 and the rotating member 54 and the sleeve 53 are moved to the rear end side by the ineffective force of the spring 57, the rotating member rib inclined surface 54E is shown in FIG. Thus, it rides on the rib inclined surface 51B of the rib 51A immediately above the guide groove 51a with which the rotating member rib 54A has been engaged. Then, the rotating member rib inclined surface 54E slides on the rib inclined surface 51B, and accordingly, the rotating member 54, the retainer sleeve 52, and the tip tool 2 rotate around the axis of the tip tool 2. Then, the rotation member rib 54A engages with the guide groove 51a immediately above the guide groove 51a that has been engaged in FIG. 5 and FIG. 12, and thereby the rotation member 54, the retainer sleeve 52, and The rotation of the tip tool 2 is restricted. Then, the rotating member 54 is further moved to the rear end side by the urging force of the spring 57 and comes into contact with the sleeve 53. Then, the sleeve 53 and the rotating member 54 come into contact with each other again as shown in FIG. 10, and in this state, the sleeve 53 and the rotating member 54 move to the rear end side, and the sleeve rib 53A moves to the guide groove 51a. By abutting against the portion of the front cover 51 that defines the end of the dead end, the movement of the sleeve 53 and the rotating member 54 in the axial direction of the handle 2A of the tip tool 2 is restricted.

  By performing the above series of operations, the rotating member 54, the retainer sleeve 52, and the tip tool 2 can be rotated by 30 ° around the axis of the handle 2A of the tip tool 2. Therefore, for example, when it is desired to rotate the tip tool 2 by 90 ° from the current angle, the above-described series of operations may be repeated three times.

  When the rotation member 54 is moved to the rotatable position by the movement of the sleeve 53, the rotation member 54 has a rotating means for rotating the rotation member 54 with respect to the sleeve 53 by the urging force of the spring 57. The rotating member 54, the retainer sleeve 52, and the tip tool 2 can be rotated about the axis of the tip tool 2 by only one action such as moving only to the tip end side of the two axial directions. For this reason, the user's operativity of the impact tool 1 can be improved, and the operation burden to the user at the time of operation can be reduced.

  Further, since the rotating means includes the rib inclined surface 51B, the rotating member rib inclined surface 54E, the inclined surface 53D, and the inclined surface 54C, the configuration for rotating the tip tool 2 in the impact tool 1 is not complicated. In addition, it is possible to eliminate the need for complicated adjustment in the configuration. For this reason, the cost concerning manufacture of the impact tool 1 can be reduced.

  Further, since the spring 57 abuts the need holder 56 and the rotating member 54, and the spring 57 biases the needle holder 56 so as to maintain the restricted position, both the need holder 56 and the rotating member are moved by one spring 57. Thus, the number of parts of the impact tool 1 can be reduced.

  Further, since the rib 51A is provided on the entire circumference of the front cover 51, when the tip tool 2 is desired to have a desired rotation angle, the tip tool 2 is rotated to an angle close to the desired rotation angle. In this state, the rotating member 54, the retainer sleeve 52, and the tip tool 2 can be fixed to be non-rotatable at the angle.

  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, in the present embodiment, the tip tool 2 and the retainer sleeve 52 are rotated by moving the sleeve 53 toward the front end side. However, the tip tool 2 and the retainer sleeve 52 are rotated by moving the sleeve 53 toward the rear end side. It may be a simple configuration.

  Further, the rotating means is not limited to the rib inclined surface 51B, the rotating member rib inclined surface 54E, the inclined surface 53D, and the inclined surface 54C as in the present embodiment.

  The impact tool of the present invention is particularly useful in the field of impact tools to which a tip tool having a substantially flat portion such as a cutter or a scoop is attached.

DESCRIPTION OF SYMBOLS 1 ... Impact tool 2 ... Tip tool 2a ... Long groove 51 ... Front cover 51A ... Rib 51B ... Rib inclined surface 51a ... Guide groove 52 ... Retainer sleeve 52a ... · Through hole 53 ··· Sleeve 53A · · · Sleeve rib 53B · · · Mountain portion 53C · · · Slope 54 · · · Rotary member 54E · · · Rotary member rib inclined surface 55 · · · Needle 56 ···・ Needle holder 57 ・ ・ ・ Spring

Claims (4)

A retainer sleeve having a substantially cylindrical shape and an inner peripheral surface supporting the tip tool and capable of rotating integrally with the tip tool about the axis of the tip tool;
A front cover that has a substantially cylindrical shape and rotatably supports the retainer sleeve;
A rotatable position supported by the front cover and capable of rotating integrally with the retainer sleeve with respect to the front cover, and aligned with the rotatable position in the axial direction of the tip tool and not rotatable with respect to the front cover. A rotation member movable between the non-rotatable position, and
A spring that contacts the rotating member and biases the rotating member in a direction from the rotatable position toward the non-rotatable position;
A sleeve supported on the front cover, capable of abutting on one end of the rotating member, movable in the axial direction of the tip tool, and non-rotatable with respect to the front cover;
And a rotating means for rotating the rotating member relative to the sleeve by a biasing force of the spring when the rotating member is moved to the rotatable position by the movement of the sleeve. Blow tool to do. Each of the rotating member and the sleeve has a substantially cylindrical shape, and the front cover is inserted therethrough.
On the outer peripheral surface of the front cover, a plurality of ribs extending in the axial direction of the tip tool are provided at predetermined intervals in the circumferential direction of the front cover, and a guide groove is formed between the ribs.
A sleeve rib that is always engaged with the guide groove is provided on the inner peripheral surface of the sleeve,
The inner circumferential surface of the rotating member is engaged with the guide groove when the rotating member is in the non-rotatable position and is disengaged from the guide groove when the rotating member is in the rotatable position. Moving member ribs are provided,
The rotating means includes
A rib inclined surface provided at an end of each rib in a direction from the non-rotatable position to the rotatable position, and intersecting the circumferential direction at the same first predetermined angle;
A rotating member rib inclined surface provided at an end of each rotating member rib in a direction from the rotatable position to the non-rotatable position, and substantially parallel to the rib inclined surface;
A sleeve end inclined surface that is provided at an end of the sleeve that contacts the rotating member, intersects the circumferential direction at a second predetermined angle, and inclines in the same direction as the rib inclined surface;
A rotating member end inclined surface that is provided at an end of the rotating member on the side in contact with the sleeve, is parallel to the sleeve end inclined surface, and contacts the sleeve end inclined surface; ,
Due to the biasing force of the spring, the inclined surface of the sleeve end and the inclined surface of the rotating member end are always in contact with each other, and when the rotating member is in the rotatable position, 2. The impact tool according to claim 1, wherein the inclined surface slides with respect to the inclined surface of the sleeve end. A long groove extending in the axial direction of the tip tool is formed on the peripheral surface of the tip tool,
A portion of the retainer sleeve that can face the long groove is formed with a through hole that penetrates the retainer sleeve in a radial direction of the retainer sleeve, and a needle is movable in the radial direction of the retainer sleeve in the through hole. Provided, and when the needle moves radially inward of the retainer sleeve, the needle is engageable with a long groove of the tip tool;
A restriction position provided on the outer peripheral surface of the retainer sleeve for restricting the movement of the needle to maintain the engagement state of the needle with the long groove, and releasing the restriction of the movement of the needle and allowing the needle to move A movable holder position and a needle holder that can move between,
3. The striking tool according to claim 1, wherein the other end of the spring abuts against the needle holder, and the spring biases the needle holder so as to maintain the restricting position.   The striking tool according to any one of claims 1 to 3, wherein the rib is provided over the entire circumference of the front cover.

Images