JP2013086213A - Work tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for enabling a tip tool to be held in a work tool with a simple configuration.SOLUTION: An electric vibration tool having an outer flange 130 which can be attached to and detached from a clamp head 123 formed at a clamp shaft 122 is configured. The clamp shaft 122 is configured so as to be able to move in a long axis direction according to a clamp position and a release position where a cam lever is positioned. When the cam lever is positioned at the release position, the outer flange 130 is linearly moved in a direction that intersects with the long axis direction of the clamp shaft 122 with respect to the clamp shaft 122, is engaged with the clamp head 123, and is positioned and fixed. When the cam lever is positioned at the clamp position, by a biasing force of a coil spring, a clamp force is caused between the outer flange 130 and a spindle, and a blade is held by the clamp shaft 122 by the clamp force.

Description

  The present invention relates to a work tool for driving a clamped tip tool.

  Japanese Patent Publication No. 2007-533472 discloses a work tool for driving a tool held between a work spindle and a fastening element. The work tool is configured such that the fastening element is slidable with respect to the work spindle between a clamp position for holding the tool and an open position where it is removed from the work spindle. In the clamping position, the clamp shaft of the fastening element is held by the stop assembly provided inside the work spindle, and the clamping force applied by the spring element provided inside the work spindle is used to clamp the work spindle and the fastening element. There is a tool in between.

Special table 2007-533472 gazette

  However, since the work tool described in JP-T-2007-533472 is configured to hold the end tool by holding the fastening element by a stop assembly, a spring element, or the like, the stop tool for holding the fastening element is used. It is necessary to provide an assembly, a spring element, etc., and the structure for holding the tip tool becomes complicated. Then, an object of this invention is to provide the technique which can hold | maintain a tip tool with a simple structure in a working tool in view of the above.

  In order to solve the above-described problems, according to a preferred embodiment of the work tool according to the present invention, the work tool has a drive shaft and a clamp member that can be attached to and detached from the drive shaft. A work tool is configured to drive the tip tool held on the drive shaft via a clamping action. The drive shaft has an engagement portion that engages with the clamp member, and the attachment of the clamp member is moved in the crossing direction in which the clamp member intersects the longitudinal direction of the drive shaft with respect to the drive shaft, and the engagement portion The driving shaft is configured to generate a clamping force in a direction in which the tip tool is inserted. The “clamping action by the clamp member” is preferably configured by cooperation of the clamp member and another member.

  According to the present invention, since the tip tool is clamped by the clamp member that can be attached to and detached from the drive shaft, the tip tool can be held with a simple configuration of the drive shaft and the clamp member. Further, the clamp member is attached by moving the clamp member in the crossing direction that intersects the long axis direction of the drive shaft with respect to the drive shaft, thereby positioning and fixing the clamp member with respect to the engaging portion. Since the clamping force is generated in the insertion direction, the clamping member can be easily attached.

  According to the further form of the working tool which concerns on this invention, a clamp member is linearly moved to the direction which cross | intersects the long axis direction of a drive shaft with respect to a drive shaft, and is positioned and fixed with respect to an engaging part. It is the composition which is done.

  According to this embodiment, the clamp member is configured to be positioned and fixed with respect to the engaging portion by moving linearly in a direction crossing the long axis direction of the drive shaft. The clamp member can be easily attached by simple movement.

  According to the further form of the work tool which concerns on this invention, a clamp member is moved to the circular arc shape regarding the longitudinal direction of a drive shaft with respect to a drive shaft, and is positioned and fixed with respect to an engaging part. It is a configuration.

  According to the present embodiment, the clamp member is configured to be positioned and fixed with respect to the engaging portion by being moved in an arc shape in the circumferential direction with respect to the longitudinal direction of the drive shaft. The clamp member can be easily attached by movement.

  According to the further form of the working tool which concerns on this invention, the clamp member has the 1st part engaged with an engaging part, and the 2nd part which cannot be engaged with an engaging part. When the drive shaft and the clamp member are located at the first position, the first portion engages with the engaging portion, and when the drive shaft and the clamp member are located at the second position, the second portion is opposed to the engaging portion. It is detachable and is configured to be movable between a first position and a second position.

  According to this embodiment, the clamp member is engaged with the drive shaft by moving from the second position to the first position, and the clamp member is moved from the first position to the second position by moving the clamp member to the drive shaft. Can be removed from. Therefore, the clamp member can be easily attached to and detached from the drive shaft by a simple movement between the first position and the second position in the positional relationship between the clamp member and the drive shaft.

  According to the further form of the working tool which concerns on this invention, the drive shaft is comprised so that a movement between the holding position which hold | maintains a tip tool, and the cancellation | release position which cancels | releases holding | maintenance of a tip tool is comprised. The clamp member is configured to hold the tip tool at the holding position and to be detachable from the drive shaft at the release position.

  According to this embodiment, the drive shaft is movable between the holding position and the release position, and the clamp member is configured to be detachable from the drive shaft at the release position. Can be attached and detached. That is, malfunctions can be suppressed with respect to the attachment and detachment of the clamp member. Furthermore, the clamp member can reliably hold the tip tool at the holding position. Further, by moving the drive shaft to the holding position and the release position, the tip tool can be easily removed without using a special tool.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can hold | maintain a front-end tool with a simple structure in a working tool can be provided.

It is a fragmentary sectional view of the electric vibration tool concerning a 1st embodiment of the present invention. It is sectional drawing in the II-II line of FIG. It is a perspective view of an outer flange and a clamp shaft. It is a perspective view which shows the state by which the outer flange was fixed to the clamp shaft. It is a figure which shows the state which a cam lever is located in a release position. It is a perspective view of the outer flange and clamp shaft which concern on 2nd Embodiment. It is a perspective view which shows the state before an outer flange is fixed to a clamp shaft. It is a perspective view which shows the state by which the outer flange was fixed to the clamp shaft. It is a perspective view of the outer flange and clamp shaft which concern on 3rd Embodiment. It is the perspective view which looked at the outer flange from the side with which a clamp shaft engages. It is a perspective view which shows the state before an outer flange is fixed to a clamp shaft. It is a perspective view which shows the state by which the outer flange was fixed to the clamp shaft.

  Embodiments of the present invention will be described in detail with reference to the drawings. The present embodiment is an example in which the present invention is applied to an electric vibration tool as a work tool.

(First embodiment)
As shown in FIG. 1, the electric vibration tool 100 selectively attaches a plurality of types of tools such as a blade and a polishing pad, and vibrates the attached tool so that the tool is applied to a workpiece. It is a work tool that performs processing such as cutting and polishing according to the type. In the present embodiment, description will be made using a blade 200 as an example of a tool. The tool such as the blade 200 is an implementation configuration example corresponding to the “tip tool” in the present invention.

  The electric vibration tool 100 is mainly composed of a drive mechanism 102, a tool holding mechanism 103, a tool holding release mechanism 104 and the like housed in a main body housing 101.

  As shown in FIGS. 1 and 2, the drive mechanism 102 is mainly configured by a motor 110, an eccentric shaft 112, a bearing 113, a driven arm 114, a spindle connection portion 115, and the like. The eccentric shaft 112 is disposed at the tip of the output shaft 111 of the motor 110 and at a position eccentric to the rotation shaft of the output shaft 111 so as to extend in a direction parallel to the rotation shaft. The bearing 113 is attached to the eccentric shaft 112. The driven arm 114 includes two arm portions 114 a extending from the spindle connection portion 115 toward the motor 110. The driven arm 114 is disposed so that the two arm portions 114 a come into contact with the bearing 113 at two opposite positions outside the bearing 113. In FIG. 2, the main body housing 101 is not shown for convenience of explanation.

  The tool holding mechanism 103 is a mechanism for holding the blade 200 and transmitting the output of the motor 110 to the blade 200 to vibrate the blade 200. The spindle 120, the drive transmission shaft 121, the clamp shaft 122, the outer flange 130, the clamp The shaft holding mechanism 135 and the like are mainly configured.

  The spindle 120 is a hollow cylindrical member. The drive transmission shaft 121 is a hollow cylindrical member and is connected to the spindle 120. The spindle 120 and the drive transmission shaft 121 are arranged so that the major axis direction extends in a direction intersecting the output shaft 111 of the motor 110. The coupled spindle 120 and the drive transmission shaft 121 are supported by the main body housing 101 via bearings 125 and 126 so as to be rotatable around the long axis direction.

  As shown in FIG. 3, the clamp shaft 122 is a substantially cylindrical member, and includes a shaft 122a, an outer flange mounting portion 122b having a smaller diameter than the shaft 122a formed at one end of the shaft 122a, and an outer flange. The clamp head 123 is connected to the mounting portion 122b. The clamp head 123 is larger than the radial size of the outer flange mounting portion 122b. In other words, the clamp head 123 is formed to protrude in the radial direction with respect to the outer flange mounting portion 122b. As shown in FIG. 1, the clamp head 123 is inserted into a through hole formed in the blade 200 and holds the blade 200, so that the clamp head 123 is smaller than the through hole of the blade 200 and can be inserted into the through hole. Yes. The clamp shaft 122 has a shaft 122a disposed inside the spindle 120 in parallel with the major axis direction of the spindle 120, and is movable in the major axis direction. The clamp shaft 122 and the clamp head 123 are implementation configuration examples corresponding to the “drive shaft” and the “engagement portion” in the present invention, respectively.

  As shown in FIG. 3, the outer flange 130 is a substantially C-shaped disk-like member in a plan view, and has a recess 131 in a side view. The outer flange 130 is configured to be attachable to and detachable from the outer flange mounting portion 122 b, and the recess 131 is configured to engage with the clamp head 123. This outer flange 130 is an implementation structural example corresponding to the "clamp member" in this invention.

  FIG. 4 shows a state where the outer flange 130 is attached to the clamp shaft 122. The outer flange 130 is linearly moved from the radial direction intersecting the major axis direction of the clamp shaft 122, thereby engaging with the outer flange mounting portion 122b. At this time, the recess 131 engages with the clamp head 123, and the outer flange 130 is positioned and fixed with respect to the clamp head 123. The fixing of the outer flange 130 affects not only the shape engagement of the recess 131 and the clamp head 123 but also the frictional force generated by the engagement.

  As shown in FIG. 1, the clamp shaft holding mechanism 135 is a mechanism that holds the clamp shaft 122 and biases the clamp head 123 in a direction approaching the spindle 120. The clamp shaft holding mechanism 135 is mainly composed of an axial direction moving member 136, a circlip 137, a coil spring 138, and the like.

  The axially moving member 136 is a substantially disk-shaped member having a through hole through which the clamp shaft 122 is inserted, and has an outer diameter that is substantially the same as the inner diameter of the hollow portion of the spindle 120. The circlip 137 is a member that engages with the end of the clamp shaft 122 opposite to the clamp head 123. The outer diameter of the circlip 137 is larger than the through hole of the axial movement member 136, and the clamp shaft 122 inserted through the axial movement member 136 is prevented from coming out of the through hole.

  In the clamp shaft 122, the shaft 122 a of the clamp shaft 122 is inserted into the spindle 120 and the axial movement member 136 in a state where the axial movement member 136 is disposed inside the spindle 120, and the circlip 137 is connected to the clamp shaft 122. By being engaged, it is held by the clamp shaft holding mechanism 135. As a result, the clamp shaft 122 is held in parallel with the long axis direction of the spindle 120 by the clamp shaft holding mechanism 135.

  In addition, a coil spring 138 that applies a biasing force in a direction parallel to the shaft 122 a is disposed between the axial direction moving member 136 inside the spindle 120 and the spindle 120. The coil spring 138 urges the axial movement member 136 to urge the clamp head 123 in the direction approaching the spindle 120.

  The tool holding mechanism 103 configured as described above urges the outer flange 130 engaged with the clamp head 123 in the direction approaching the spindle 120 by the urging force of the coil spring 138, thereby causing the outer flange 130 and the spindle to be urged. The blade 200 disposed between 120 is integrally held. The urging force of the coil spring 138 generates a clamping force for holding the blade 200 in the axial direction of the clamp shaft 122 between the outer flange 130 and the spindle 120.

  The tool holding release mechanism 104 is a mechanism that allows the outer flange 130 to be detached from the clamp shaft 122 by releasing the biasing force of the coil spring 138 that biases the clamp shaft 122. When the outer flange 130 is removed, the blade 200 sandwiched between the spindle 120 and the outer flange 130 can be removed. The tool holding / release mechanism 104 is mainly configured by a thrust pin 140, a cam lever 150, and the like.

  The thrust pin 140 is disposed inside the drive transmission shaft 121 and is slidable in the major axis direction of the drive transmission shaft 121. One end of the thrust pin 140 is disposed so as to be in contact with the axial movement member 136, and the other end is disposed so as to be able to contact with the cam lever 150.

  The cam lever 150 is a member that abuts on the thrust pin 140 and slides the thrust pin 140 in the long axis direction of the drive transmission shaft 121, and is configured mainly by the lever portion 151, the turning shaft 152, and the eccentric portion 153. .

  The cam lever 150 is configured such that the lever portion 151 can turn around a turning shaft 152 orthogonal to the longitudinal direction of the drive transmission shaft 121. An eccentric portion 153 that can contact the thrust pin 140 is provided around the pivot shaft 152. The eccentric part 153 is arranged so that the center position is eccentric with respect to the axis center of the turning shaft 152, so that the distance from the axis center of the turning shaft 152 is different at each position on the outer periphery of the eccentric part 153. It is configured.

  Specifically, as shown in FIG. 1, when the lever portion 151 is positioned in the direction from the pivot shaft 152 toward the motor 110 (hereinafter referred to as a clamp position), the eccentric portion 153 contacts the thrust pin 140. Not. On the other hand, as shown in FIG. 5, when the lever portion 151 is pivoted and the lever portion 151 is positioned in a direction opposite to the clamp position from the pivot shaft 152 (hereinafter referred to as a release position), the eccentric portion 153. Is in contact with the thrust pin 140. That is, by turning the lever portion 151 from the clamp position toward the release position, the eccentric portion 153 contacts the thrust pin 140 on the way to the release position. By further turning the lever portion 151 toward the release position from that position, the eccentric portion 153 moves the thrust pin 140 toward the side (downward) where the clamp shaft 122 is disposed in the longitudinal direction of the drive transmission shaft 121. It is configured to move.

  The tool holding release mechanism 104 configured as described above turns the cam lever 150 from the clamp position to the release position and slides the thrust pin 140, so that the thrust pin 140 attaches the axial movement member 136 to the coil spring 138. Move down against the forces. At this time, the urging force of the coil spring 138 is released and the clamp shaft 122 can move freely in the long axis direction. Further, when the thrust pin 140 moves downward, the thrust pin 140 contacts the clamp shaft 122 and moves the clamp shaft 122 downward. Accordingly, the outer flange 130 can be removed from the clamp shaft 122, and the blade 200 that has been inserted and held by the clamp shaft 122 can be removed by removing the outer flange 130.

  On the other hand, when the blade 200 is mounted on the clamp shaft 122, the clamp shaft 122 is inserted through the through hole of the blade 200. Thereafter, the outer flange 130 is moved linearly from the radial direction of the clamp shaft 122 on the side opposite to the spindle 120 of the blade 200 and engaged with the clamp head 123 to be fixed. When the cam lever 150 is pivoted from the release position to the clamp position with the outer flange 130 engaged with the clamp shaft 122, the axial movement member 136 and the thrust pin 140 are moved in the longitudinal direction of the spindle 120 by the biasing force of the coil spring 138. Moved upwards. At this time, the circlip 137 contacts the axial movement member 136 and moves upward, thereby moving the clamp shaft 122 upward. As a result, the outer flange 130 engaged with the clamp head 123 is moved in the direction approaching the spindle 120, an axial clamping force of the clamp shaft 122 is generated between the outer flange 130 and the spindle 120, and the blade 200 is moved to the outer side. It is held between the flange 130 and the spindle 120.

  In the electric vibrating tool 100 configured as described above, when the motor 110 is energized and driven, the rotational movement of the output shaft 111 is indicated by the arrow A by the eccentric shaft 112 and the bearing 113 as shown in FIG. It is converted into a reciprocating motion in a direction (hereinafter referred to as A direction). The reciprocating motion in the A direction is transmitted to the driven arm 114, and a predetermined angle in the circumferential direction (hereinafter referred to as B direction) around the drive transmission shaft 121 indicated by the arrow B with the spindle connecting portion 115 as the center. It is converted to the rotational motion that makes. As a result, the drive transmission shaft 121 connected to the spindle connecting portion 115 is driven to reciprocate in the B direction. At this time, the spindle 120 is driven integrally with the drive transmission shaft 121. As a result, the blade 200 held by the clamp shaft 122 that rotates integrally with the spindle 120 can be vibrated by the urging force of the coil spring 138, and the workpiece can be cut or processed.

  According to the first embodiment described above, the urging force of the coil spring 138 acting on the outer flange 130 can be released simply by turning the cam lever 150, and the outer flange 130 can be removed. Then, the blade 200 can be removed by removing the outer flange 130. That is, the blade 200 can be easily removed without using a special tool.

  Further, the outer flange 130 is attached to the clamp shaft 122 by moving the outer flange 130 linearly from the radial direction of the clamp shaft 122, thereby positioning and fixing the outer flange 130 with respect to the clamp head 123. . That is, the outer flange 130 can be positioned and fixed with respect to the clamp head 123 with a simple configuration in which the outer flange 130 is simply moved in a direction intersecting the major axis direction of the clamp shaft 122. Thereby, the blade 200 can be held, and as a result, the blade 200 can be easily replaced without using a special tool.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The second embodiment differs from the first embodiment only in the clamp shaft 122 and the outer flange 130, and the configuration other than the clamp shaft 122 and the outer flange 130 is the same. Therefore, the description of the configuration other than the clamp shaft 122 and the outer flange 130 is omitted.

  As shown in FIG. 6, the clamp shaft 222 is a substantially cylindrical member, and includes a shaft 222a, an outer flange mounting portion 222b having a smaller diameter than the shaft 222a formed at one end of the shaft 222a, and an outer flange. It has a clamp head 223 connected to the mounting portion 222b. The clamp head 223 is larger than the radial size of the outer flange mounting portion 222b. In other words, the clamp head 223 is formed to protrude in the radial direction with respect to the outer flange mounting portion 222b. The clamp head 223 is formed of an arc-shaped portion that is larger than the radial direction of the shaft 222a and a linear portion that includes a portion that is smaller than the radial direction of the shaft 222a. The clamp head 223 is inserted into a through-hole formed in the blade 200 and holds the blade 200, so that the clamp head 223 is smaller than the through-hole of the blade 200 and can be inserted into the through-hole of the blade 200. The clamp shaft 222 and the clamp head 123 are implementation configuration examples corresponding to the “drive shaft” and the “engagement portion” in the present invention, respectively.

  The outer flange 230 is a disk-shaped member. A through portion 231 having the same shape as the clamp head 223 is formed at the center of the outer flange 230. In addition, on both sides of the penetrating portion 231, engagement concave portions 232 with which the clamp head 223 can be engaged are formed. This outer flange 230 is an implementation configuration example corresponding to the “clamp member” in the present invention.

  As shown in FIG. 7, the outer flange 230 configured as described above has a shaft 222 a corresponding to the linear portion of the clamp head 223 engaged with the outer flange 230 when the clamp head 223 is inserted into the through portion 231. The movement of the outer flange 230 in the major axis direction of the clamp shaft 222 is stopped by coming into contact with the opposite side of the recess 232.

  Thereafter, by rotating the outer flange 230 in an arc shape in the direction of the arrow, as shown in FIG. 8, the clamp head 223 and the engagement recess 232 are engaged, and the outer flange 230 is positioned and fixed to the clamp head 223. Is done. In other words, the outer flange 230 is moved in a direction crossing the major axis direction of the clamp shaft 222 to position and fix the outer flange 230 to the clamp head 223. That is, in a state where the clamp head 223 is inserted through the through-hole 231, the outer flange 230 is not positioned and fixed with respect to the clamp head 223, and the outer flange 230 is clamped by rotating the outer flange 230. It is configured to be positioned and fixed with respect to the head 223.

  Also in the second embodiment described above, as in the first embodiment, when the cam lever 150 is pivoted from the clamp position to the release position and the clamp shaft 222 is moved downward, the outer flange 230 moves in the circumferential direction of the clamp shaft 222. And can be detached from the clamp shaft 222. By removing the outer flange 230, it is possible to remove the blade 200 in which the clamp shaft 222 is inserted and held.

  On the other hand, when the blade 200 is attached to the clamp shaft 222, the clamp shaft 222 is inserted through the through hole of the blade 200. Thereafter, the outer flange 230 is inserted from the axial direction of the clamp shaft 222 on the side opposite to the spindle 120 of the blade 200. Then, the outer flange 230 is rotated in the circumferential direction of the clamp shaft 222 to position and fix the outer flange 230 with respect to the clamp head 223. When the cam lever 150 is turned from the release position to the clamp position while the outer flange 230 is fixed to the clamp shaft 222, the clamp shaft 222 is moved upward in the longitudinal direction of the spindle 120. As a result, the outer flange 230 fixed to the clamp head 223 is moved in the direction approaching the spindle 120, an axial clamping force of the clamp shaft 222 is generated between the outer flange 230 and the spindle 120, and the blade 200 is moved to the outer side. It is held between the flange 230 and the spindle 120.

  According to the second embodiment described above, the urging force of the coil spring 138 acting on the outer flange 230 can be released simply by turning the cam lever 150, and the outer flange 230 can be removed. Then, the blade 200 can be removed by removing the outer flange 230. That is, the blade 200 can be easily removed without using a special tool.

  Further, the outer flange 230 is attached to the clamp shaft 222 after the outer flange 230 is engaged with the clamp shaft 222 from the axial direction of the clamp shaft 222 and then the outer flange 230 is inserted in the circumferential direction intersecting the major axis direction of the clamp shaft 222. The outer flange 230 is positioned and fixed with respect to the clamp head 223 by moving in an arc shape. That is, the outer flange 230 can be positioned and fixed with respect to the clamp head 223 with a simple configuration in which the outer flange 230 is simply moved in a direction crossing the major axis direction of the clamp shaft 222. Thereby, the blade 200 can be held, and as a result, the blade 200 can be easily replaced without using a special tool.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. The third embodiment differs from the first embodiment only in the clamp shaft 122 and the outer flange 130, and the configuration other than the clamp shaft 122 and the outer flange 130 is the same. Therefore, the description of the configuration other than the clamp shaft 122 and the outer flange 130 is omitted.

  As shown in FIG. 9, the clamp shaft 322 is a substantially cylindrical member, and includes a shaft 322 a, an outer flange guide groove 324, and an outer flange engagement groove 324 that is connected to the outer flange guide groove 323. . The shaft 322 a is inserted into a through hole formed in the blade 200 and holds the blade 200, and thus is smaller than the through hole of the blade 200 and is formed so as to be inserted into the through hole of the blade 200. The outer flange guide groove 323 and the outer flange engagement groove 324 are grooves of the same depth formed by being recessed in the radial direction with respect to the shaft 322a at two opposing positions in the circumferential direction of the clamp shaft 322. The outer flange guide groove 323 extends in parallel with the major axis direction of the clamp shaft 322. The outer flange engaging groove 324 is formed along the circumferential direction of the clamp shaft 322, and one end thereof is connected to the outer flange guide groove 323. The width of the outer flange guide groove 323 is formed larger than the width of the outer flange engagement groove 324. The clamp shaft 322 and the outer flange engagement groove 324 are implementation configuration examples corresponding to the “drive shaft” and the “engagement portion” in the present invention, respectively.

  As shown in FIGS. 9 and 10, the outer flange 330 is a disk-shaped member. A bottomed engagement hole 331 with which the clamp shaft 323 engages is formed at the center of the outer flange 330. Two engaging convex portions 332 projecting in the radial direction of the engaging hole 331 are formed in the engaging hole 331. The engagement convex portion 332 is urged by the urging mechanism 333 in a direction toward the radially inner side of the engagement hole 331. The width of the engaging projection 332 is substantially equal to the width of the outer flange engaging groove 324 and is smaller than the width of the outer flange guide groove 323. The distance from the bottom of the engagement hole 331 to the engagement protrusion 332 is formed to be equal to the length of the outer flange guide groove 323 in the long axis direction of the clamp shaft 322. The outer flange 330 is an implementation configuration example corresponding to the “clamp member” in the present invention.

  As shown in FIG. 11, the outer flange 330 configured as described above is engaged when the clamp shaft 322 is inserted into the engagement hole 331 at a position where the engagement protrusion 332 and the outer flange guide groove 323 correspond. The tip of the clamp shaft 322 comes into contact with the bottom of the joint hole 331, and the movement of the outer flange 330 in the long axis direction of the clamp shaft 322 is stopped.

  Thereafter, by rotating the outer flange 330 in the direction of the arrow, as shown in FIG. 12, the engaging convex portion 332 and the outer flange engaging groove 323 are engaged, and the outer flange 330 is positioned on the clamp shaft 322. Fixed. In other words, the outer flange 330 is rotationally moved in the circumferential direction intersecting the major axis direction of the clamp shaft 322, and the outer flange 330 is positioned and fixed with respect to the clamp shaft 322. That is, in a state where the clamp shaft 322 is inserted into the engagement hole 331 of the outer flange 330, the outer flange 330 is not positioned and fixed with respect to the clamp shaft 322, and by rotating the outer flange 330, The outer flange 330 is configured to be positioned and fixed with respect to the clamp shaft 222 by engaging with the outer flange engaging groove 323.

  Also in the third embodiment, as in the first embodiment, when the cam lever 150 is pivoted from the clamp position to the release position and the clamp shaft 322 is moved downward, the outer flange 330 is moved in the circumferential direction of the clamp shaft 322. And can be detached from the clamp shaft 322. By removing the outer flange 330, it is possible to remove the blade 200 through which the clamp shaft 322 is inserted and held.

  On the other hand, when the blade 200 is mounted on the clamp shaft 322, the clamp shaft 322 is inserted through the through hole of the blade 200. Thereafter, the outer flange 330 is inserted in the axial direction of the clamp shaft 322 on the opposite side of the blade 200 from the spindle 120. Then, the outer flange 330 is rotated in the circumferential direction of the clamp shaft 322 to position and fix the outer flange 330 with respect to the clamp shaft 322. When the cam lever 150 is pivoted from the release position to the clamp position while the outer flange 330 is fixed to the clamp shaft 322, the clamp shaft 322 is moved upward in the longitudinal direction of the spindle. As a result, the outer flange 330 fixed to the clamp shaft 322 is moved in the direction approaching the spindle 120, and an axial clamping force of the clamp shaft 322 is generated between the outer flange 330 and the spindle 120, and the blade 200 is moved to the outer side. It is held between the flange 330 and the spindle 120.

  According to the third embodiment described above, the urging force of the coil spring 138 acting on the outer flange 330 can be released simply by turning the cam lever 150, and the outer flange 330 can be removed. Then, the blade 200 can be removed by removing the outer flange 330. That is, the blade 200 can be easily removed without using a special tool.

  Further, the outer flange 330 is attached to the clamp shaft 322 after the outer flange 330 is engaged with the clamp shaft 322 from the axial direction of the clamp shaft 322, and then the outer flange 330 is moved in the circumferential direction intersecting the major axis direction of the clamp shaft 322. The outer flange 330 is positioned and fixed with respect to the clamp shaft 322 by moving in an arc shape. That is, the outer flange 330 can be positioned and fixed with respect to the clamp shaft 322 with a simple configuration in which the outer flange 330 is simply moved in a direction intersecting the long axis direction of the clamp shaft 322. Thereby, the blade 200 can be held, and as a result, the blade 200 can be easily replaced without using a special tool.

  In each of the above embodiments, the blade 200 is used as the tip tool. However, the tip tool is not limited to the blade 200, and a polishing pad or the like may be attached as the tip tool. Although the coil spring 138 has been described as the urging member, the urging member may be another spring element such as a disc spring, or a rubber member that generates a restoring force by elastic deformation. Or resin.

(Modification)
In the above description, the blade 200 is configured to be held between the outer flanges 130, 230, and 330 and the spindle 120, but is not limited thereto. For example, a tool holding portion that abuts against the radially projecting blade 200 is provided at a position spaced apart in the long axis direction from a position where the outer flanges 130, 230, 330 of the clamp shafts 122, 222, 322 are engaged. The blade 200 may be held between the outer flange 130, 230, 330 and the tool holding portion. The position of the tool holding portion may be provided at a position separated from the outer flanges 130, 230, 330 by a length corresponding to the thickness of the blade 200 in a state where the outer flanges 130, 230, 330 are attached. . In this case, the frictional force generated on the contact surfaces of the blade 200 and the tool holding portion and between the blade 200 and the outer flanges 130, 230, and 330 becomes the clamping force, and the blade 200 is held by the clamping force.

  Moreover, in a modification, you may be comprised so that the outer flange of several thickness may be selectively attached so that the outer flange of the thickness according to the thickness of the kind of tip tool with which it is mounted | worn may be attached.

  In the above description, the electric vibration tool 100 is used as the work tool. However, the present invention is not limited to this, and the work tool that rotates the tip tool, such as a grinder or a circular saw, is not limited thereto. The present invention can also be applied to a tool.

In view of the gist of the invention, the following aspects can be configured.
(Aspect 1)
A drive shaft;
A clamp member removable from the drive shaft;
The working shaft is inserted into the driving shaft and drives a tip tool held by the driving shaft through a clamping action by the clamping member,
The drive shaft includes a shaft portion extending in a long axis direction, and an engagement portion that is connected to the shaft portion and engages with the clamp member, and the clamp member engages with the engagement portion and The drive shaft is configured to generate a clamping force in a direction in which the tip tool is inserted to hold the tip tool,
The operation is characterized in that the engaging portion has a length different from a length in a crossing direction intersecting the major axis direction of a connecting portion connected to the engaging portion of the shaft portion. tool.

(Aspect 2)
The work tool according to aspect 1,
The working tool is characterized in that the engaging portion is constituted by a convex portion protruding in the intersecting direction with respect to the connecting portion.

(Aspect 3)
The work tool according to aspect 1,
The working tool is characterized in that the engaging portion is constituted by a concave portion recessed in the intersecting direction with respect to the connecting portion.

(Aspect 4)
The work tool according to aspect 2 or 3,
The said clamping member is comprised so that attachment or detachment is possible by moving linearly from the said crossing direction with respect to the said connection part.

(Aspect 5)
The work tool according to any one of aspects 1 to 4,
The clamp member has a first part that engages with the engaging part, and a second part that cannot engage with the engaging part,
When the drive shaft and the clamp member are positioned at the first position, the first portion engages with the engaging portion, and when the drive shaft and the clamp member are positioned at the second position, the second portion is engaged with the engagement portion. A work tool characterized in that it is detachable with respect to the joint part and is movable between the first position and the second position.

(Aspect 6)
The work tool according to any one of aspects 1 to 5,
The drive shaft is configured to be movable between a holding position for holding the tip tool and a release position for releasing the holding of the tip tool,
The work tool, wherein the clamp member is configured to be engaged with the engagement portion at the holding position to hold the tip tool, and to be detachable from the drive shaft at the release position.

100 Electric vibration tool (work tool)
DESCRIPTION OF SYMBOLS 101 Main body housing 102 Drive mechanism 103 Tip tool holding mechanism 104 Tool holding release mechanism 110 Motor 111 Output shaft 112 Eccentric shaft 114 Driven arm 120 Spindle 121 Drive transmission shaft 122 Clamp shaft (drive shaft)
122a Shaft 122b Outer flange mounting portion 123 Clamp head (engaging portion)
130 Outer flange (clamp member)
131 Recess 135 Clamp shaft holding mechanism 138 Coil spring 140 Thrust pin 150 Cam lever 200 Blade (tip tool)
222 Clamp shaft (drive shaft)
223 Clamp head (engagement part)
230 Outer flange (clamp member)
231 Through portion 232 Engaging recess 322 Clamp shaft (drive shaft)
324 Outer flange engagement groove (engagement part)
330 Outer flange (clamp member)
331 engaging hole 332 engaging convex part

Claims (5)

A drive shaft;
A clamp member removable from the drive shaft;
The working shaft is inserted into the driving shaft and drives a tip tool held by the driving shaft through a clamping action by the clamping member,
The drive shaft has an engaging portion that engages with the clamp member;
The clamp member is attached by positioning and fixing the clamp member with respect to the engagement portion by moving the clamp member with respect to the drive shaft in a crossing direction that intersects the longitudinal direction of the drive shaft. A work tool characterized in that a clamping force is generated in a direction in which the tip tool is inserted. The work tool according to claim 1,
The work tool characterized in that the clamp member is linearly moved in a direction intersecting the major axis direction with respect to the drive shaft, and is positioned and fixed with respect to the engagement portion. The work tool according to claim 1,
The work tool is configured such that the clamp member is moved in an arc shape in a circumferential direction with respect to the long axis direction with respect to the drive shaft, and is positioned and fixed with respect to the engagement portion. The work tool according to any one of claims 1 to 3,
The clamp member has a first part that engages with the engaging part, and a second part that cannot engage with the engaging part,
When the drive shaft and the clamp member are positioned at the first position, the first portion engages with the engaging portion, and when the drive shaft and the clamp member are positioned at the second position, the second portion is engaged with the engagement portion. A work tool characterized in that it is detachable with respect to the joint part and is movable between the first position and the second position. The work tool according to any one of claims 1 to 4,
The drive shaft is configured to be movable between a holding position for holding the tip tool and a release position for releasing the holding of the tip tool,
The work tool, wherein the clamp member is configured to hold the tip tool at the holding position and to be detachable from the drive shaft at the release position.

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