JP2013086212A - Work tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for suppressing the increase in size of a work tool which drives a tip tool sandwich-held.SOLUTION: By a biasing force of an O-ring 132 or a coil spring 134 arranged outside a spindle 120, an electric vibration tool 100 which holds a clamp shaft 123 arranged inside the spindle 120 is configured. By a thrust pin 140 which moves by revolution of a cam lever 150, the biasing force of the O-ring 132 or the coil spring 134 acting on the clamp shaft 123 is released, and the clamp shaft 123 can be removed. As a result, a blade 200 can be replaced without using a special tool.

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, in the work tool described in JP-T-2007-533472, the work tool may become large depending on the place where the stop assembly, the spring element, and the like are arranged. Then, an object of this invention is to provide the technique which can suppress the enlargement of a working tool in view of the above.

  In order to solve the above problems, according to a preferred embodiment of the work tool according to the present invention, the work tool includes a first shaft having a first clamp portion and a second shaft having a second clamp portion, A work tool is configured to drive the tip tool held by the second clamp portion. The first shaft and the second shaft are arranged in parallel to each other in the axial direction, and the second shaft is arranged inside the first shaft. A biasing member that generates a biasing force for holding the second shaft is provided outside the first shaft. In addition, the 2nd shaft should just be arrange | positioned at least one part inside the 1st shaft.

  According to the present invention, since the urging member for generating the urging force for holding the second shaft is provided outside the first shaft, the first shaft can be made thin. Thereby, the weight of a 1st shaft becomes light and a work tool is reduced in weight. Furthermore, since the first shaft can be made thin, the drive mechanism for driving the first shaft can be reduced in size. As a result, the work tool can be reduced in size.

  According to the further form of the work tool which concerns on this invention, a 1st shaft has an opening part opened toward the crossing direction which cross | intersects the said axial direction in the intermediate area in an axial direction, and is attached via an opening part. A holding member that transmits the urging force of the urging member to the second shaft is provided.

  According to this embodiment, the urging force can be transmitted to the second shaft by the holding member disposed at the opening of the first shaft. Therefore, compared with the structure which arrange | positions a holding member inside a 1st shaft, a 1st shaft can be made thin and, as a result, a working tool can be reduced in size.

  According to the further form of the working tool which concerns on this invention, an urging | biasing member is a structure which makes an urging | biasing force act in parallel with the axial direction of a 1st shaft. The holding member holds the second shaft by converting the urging force into a force in a direction toward the second shaft in the crossing direction.

  According to this form, in order to make the urging force of the urging member act in parallel with the axial direction of the first shaft, the urging member expands and contracts in the direction intersecting the axial direction of the first shaft to apply the urging force. In comparison with this, it is possible to suppress an increase in size of the work tool in the direction intersecting the axial direction of the first shaft.

  According to the further form of the work tool which concerns on this invention, a holding member is engaged with the axial direction movement member which receives the urging | biasing force of a urging | biasing member, and moves to the axial direction of a 1st shaft, and an axial direction movement member. And a cross direction moving member that moves in the cross direction. The holding member converts the biasing force into a force in the direction toward the second shaft in the cross direction, and the cross direction moving member holds the second shaft.

  According to this embodiment, the holding member can be formed with a simple configuration in which the two members of the axial direction moving member and the cross direction moving member are engaged.

  According to the further form of the working tool which concerns on this invention, it is arrange | positioned so that a movement in parallel with the axial direction of a 1st shaft or a 2nd shaft is carried out, and the displacement member which carries out relative movement of the 1st shaft and the said 2nd shaft in an axial direction And a biasing force releasing member that engages with the transition member and moves with the movement of the displacement member. Then, the biasing force release member releases the holding of the second shaft by the holding member when the transition member moves so as to move the first shaft and the second shaft in the axially separating direction. The biasing member is configured to move.

  According to this embodiment, when the transition member moves so as to relatively move the first shaft and the second shaft in the axial direction, the biasing force is released so as to release the holding of the second shaft by the holding member. Since the release member moves the urging member, the holding of the second shaft by the urging force can be released simultaneously with the relative movement of the first shaft and the second shaft. Therefore, there is no need to perform the relative movement of the first shaft and the second shaft and the release of the holding of the second shaft by different operations, the tip tool can be easily removed, and a special tool is not used. The tip tool can be changed.

  According to the further form of the working tool which concerns on this invention, it has a supporting member which supports a 1st shaft rotatably. And the 1st shaft is supported by the supporting member at two places in the axial direction. Further, the urging member has one end in contact with the support member and is rotatably held together with the first shaft.

  According to this embodiment, the support member that supports the first shaft can be used as a pedestal that holds the biasing member. Therefore, the number of parts of the work tool can be reduced, and as a result, the work tool can be reduced in size.

  According to another preferable form of the work tool according to the present invention, the first shaft having the first clamp portion, the second shaft having the second clamp portion, and the direction in which the first clamp portion and the second clamp portion are close to each other. The working tool is configured to drive the tip tool sandwiched between the first clamp portion and the second clamp portion. The first shaft and the second shaft are arranged in parallel to each other in the axial direction, and the second shaft is arranged inside the first shaft. The first shaft is rotatably supported by two support members at two locations in the axial direction, and a biasing member is disposed between the two support members in the axial direction. In addition, the 2nd shaft should just be arrange | positioned at least one part inside the 1st shaft.

  According to the present invention, the biasing member is disposed between the two support members in the axial direction of the first shaft. In the rotating member, the space between the supporting members in the axial direction tends to be a dead space. Therefore, in this invention, a working tool can be reduced in size by utilizing a dead space effectively.

  According to the further form of the working tool which concerns on this invention, the biasing member is arrange | positioned on the outer side of the 1st shaft.

  According to this embodiment, the biasing member is disposed outside the first shaft, so that the first shaft can be made thinner than the configuration in which the biasing member is disposed inside the first shaft. it can. Thereby, the weight of a 1st shaft becomes light and a work tool is reduced in weight. Furthermore, since the first shaft can be made thin, the drive mechanism for driving the first shaft can be reduced in size. As a result, the work tool can be reduced in size.

  According to the further form of the working tool which concerns on this invention, the biasing member is hold | maintained rotatably with the 1st shaft, one end contact | abutted with the support member.

  According to this embodiment, the support member that supports the first shaft can be used as a pedestal that holds the biasing member. Therefore, the number of parts of the work tool can be reduced, and as a result, the work tool can be reduced in size.

  According to the further form of the working tool which concerns on this invention, the biasing member is comprised so that the biasing force for hold | maintaining a 2nd shaft may be produced.

  According to this embodiment, the first clamp portion and the second clamp portion can be brought close to each other and the second shaft can be held by the biasing force of the biasing member. That is, since the biasing member has two functions, the number of parts of the work tool can be reduced, and as a result, the work tool can be reduced in size.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can suppress the enlargement of a working tool can be provided.

It is a fragmentary sectional view of the electric vibration tool concerning the present invention. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is a perspective view which shows the structure holding a clamp shaft. FIG. 5 is an exploded perspective view of FIG. 4. It is a figure which shows the state in which a cam lever is located in a clamp position. It is a figure which shows the state which a cam lever is located in a release position. It is a fragmentary sectional view of the electric vibration tool which concerns on the modification of this embodiment.

  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.

  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.

  As shown in FIGS. 1 and 2, the electric vibration tool 100 is mainly configured by 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.

  The drive mechanism 102 is mainly composed of a motor 110, an eccentric shaft 112, a bearing 113, a driven arm 114, a spindle connecting 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. As shown in FIG. 3, the driven arm 114 is composed of 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. 3, 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 tool holding mechanism 103 mainly includes the spindle 120, the clamp shaft 123, the clamp shaft holding mechanism 130, and the like. Has been.

  The spindle 120 is a hollow cylindrical member, and is arranged so that the long axis direction extends in a direction intersecting the output shaft 111 of the motor 110. The spindle 120 is supported by the main body housing 101 via bearings 125 and 126 so as to be rotatable around the long axis direction at two locations in the long axis direction. The spindle 120 is formed with a clamp member insertion hole 122a that penetrates in the radial direction of the spindle 120 in an intermediate region between the bearings 125 and 126 in the long axis direction. Further, the spindle 120 is an engagement pin that penetrates in the radial direction of the spindle 120 in a direction intersecting the clamp member insertion hole 122a in an intermediate region between the clamp member insertion hole 122a and the bearing 126 in the long axis direction. An insertion hole 122b is formed. Further, a flange 121 is attached to the tip of the spindle 120 outside the main body housing 101. The spindle 120 corresponds to the “first shaft” in the present invention, the bearings 125 and 126 correspond to the “support member” in the present invention, and the clamp member insertion hole 122a corresponds to the “opening” in the present invention. It is an implementation configuration example.

  The clamp shaft 123 is a substantially columnar member, has a clamp head 124 integrally formed at one end, and is formed in the circumferential direction that engages with the clamp member 131 at the other end. It has an engaging groove. The clamp shaft 123 is disposed inside the spindle 120 in parallel with the long axis direction of the spindle 120 and is slidable in the long axis direction on the inside of the spindle 120. The clamp shaft 123 is configured to be detachable from the spindle 120. This clamp shaft 123 is an implementation structural example corresponding to the "second shaft" in the present invention.

  The spindle 120 and the clamp shaft 123 configured as described above are capable of sandwiching the blade 200 between the clamp head 124 and the tip of the spindle 120 facing the clamp head 124 and the flange 121. The tip of the spindle 120, the flange 121, and the clamp head 124 are implementation examples corresponding to the “first clamp part” and the “second clamp part” in the present invention, respectively.

  As shown in FIGS. 4 and 5, the clamp shaft holding mechanism 130 is a mechanism that holds the end of the clamp shaft 123 opposite to the clamp head 124, and includes a clamp member 131, an O-ring 132, an annular member 133, and a coil spring. It is comprised mainly by 134. The member constituting the clamp shaft holding mechanism 120 is an implementation configuration example corresponding to the “holding member” in the present invention.

  The clamp member 131 is a member that is disposed at two opposing positions in the circumferential direction of the spindle 120 and is inserted into the clamp member insertion hole of the spindle 120, and is movable in the radial direction of the spindle 120 through the clamp member insertion hole. It is configured. The clamp member 131 has a plurality of convex portions that can be engaged with the engagement grooves of the clamp shaft 123 at positions facing the clamp shaft 123. The clamp member 131 has an inclined surface 131 a that is inclined with respect to the major axis direction of the spindle 120, and the inclined surface 131 a is configured to engage with the inclined surface of the annular member 133.

  An O-ring 132 is disposed outside the clamp member 131 and urges the clamp member 131 in the radial direction toward the center of the spindle 120. Thereby, the convex part formed in the clamp member 131 is meshed with the mating groove of the clamp shaft 123 disposed inside the spindle 120 so that the clamp shaft 123 can be held. Further, the O-ring 132 not only applies an urging force for holding the clamp shaft 123 to the clamp member 131, but also makes the posture of the clamp member 131 even when the clamp member 131 does not hold the clamp shaft 123. An urging force for holding is applied to the clamp member 131. This clamp member 131 is an implementation structural example corresponding to the “cross direction moving member” in the present invention.

  The annular member 133 is an annular member disposed so as to surround the outer side of the clamp member 131 in the radial direction of the spindle 120, and is configured to be movable in the longitudinal direction of the spindle 120. The annular member 133 has an inclined surface that engages with the inclined surface 131 a of the clamp member 131. Further, between the annular member 133 and the bearing 126, a coil spring 134 that is in contact with the annular member 133 and the bearing 126 and is disposed in parallel with the long axis direction of the spindle 120 is disposed. The annular member 133 is held in a state of being urged in the longitudinal direction of the spindle 120 by the urging force of the coil spring 134, and engages with the inclined surface 131 a of the clamp member 131, so that the clamp member 131 of the spindle 120 is engaged. Energized in the radial direction. That is, the clamp member 131 is moved in the radial direction of the spindle 120 by the engagement of the inclined surfaces of the clamp member 131 and the annular member 133. This annular member 133 is an implementation configuration example corresponding to the “axially moving member” in the present invention.

  In the clamp shaft holding mechanism 130 configured as described above, the clamp member 131 is biased in the radial direction of the spindle 120 by the O-ring 132 and holds the clamp shaft 123. On the other hand, the annular member 133 urged by the coil spring 134 engages with the inclined surface 131 of the clamp member 131, thereby converting the urging force of the coil spring 134 into the urging force in the radial direction of the spindle 120. As a result, the coil spring 134 biases the clamp member 131 in the radial direction of the spindle and holds the clamp shaft 123. That is, the clamp shaft 123 is held by the urging force of the O-ring 132 or the urging force of the coil spring 134. The O-ring 132 and the coil spring 134 are an implementation configuration example corresponding to “a biasing member that generates a biasing force for holding the second shaft” in the present invention.

  Further, the coil spring 134 biases the clamp shaft holding mechanism 130 toward the side (downward) opposite to the side (downward) where the blade 200 is held in the longitudinal direction of the spindle 120. That is, the coil spring 134 holds the clamp shaft 123 by an urging force and urges the clamp shaft 123 upward. Accordingly, the clamp head 124 is urged in the direction approaching the spindle 120 and the flange 121, and the blade 200 is sandwiched between the flange 121 and the clamp head 124.

  The tool holding release mechanism 104 is a mechanism that allows the blade 200 held between the spindle 120 and the clamp shaft 123 to be detachable by releasing the holding of the clamp shaft 123 held by the clamp shaft holding mechanism 130. The tool holding / release mechanism 104 is mainly composed of a thrust pin 140, an engaging pin 141, a clamp shaft holding / release member 142, a cam lever 150, and the like.

  The thrust pin 140 is disposed inside the spindle 120 and is slidable in the major axis direction of the spindle 120. The engagement pin 141 is inserted into the engagement pin insertion hole 122b of the spindle 120, and is engaged with the clamp shaft holding release member 142 as shown in FIG. The engagement pin 141 is configured to move in contact with the thrust pin 140 as the thrust pin 140 moves. This thrust pin 140 is an implementation configuration example corresponding to the “transition member” in the present invention.

  The clamp shaft holding / releasing member 142 is a cylindrical member that surrounds the outer periphery of the spindle 120, and can be moved in the longitudinal direction of the spindle 120 together with the engagement pin 141. Further, the clamp shaft holding release member 142 is integrated with the annular member 133 of the clamp shaft holding mechanism 130 and is configured to be movable in the longitudinal direction of the spindle 120 together with the annular member 133.

  The cam lever 150 is a member that abuts against the thrust pin 140 and slides the thrust pin 140 in the long axis direction of the spindle 120, and is mainly composed of 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 long axis direction of the spindle 120. 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. 6, 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. 7, 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. The eccentric portion 153 is configured to move the thrust pin 140 downward in the long axis direction of the spindle 120 by further turning the lever portion 151 toward the release position from that position.

  The tool holding release mechanism 104 configured as described above turns the cam pin 150 from the clamp position to the release position and slides the thrust pin 140, whereby the engagement pin 141 and the clamp shaft holding release member 142 are moved to the spindle 120. It moves downward in the major axis direction. At this time, the clamp shaft holding / releasing member 142 moves together with the annular member 133 downward in the long axis direction of the spindle 120 to move the clamp member 131 in the long axis direction of the spindle 120. After the clamp member 131 comes into contact with the spindle 120, the clamp shaft holding / releasing member 142 moves downward in the longitudinal direction of the spindle 120 together with the annular member 133, so that the relationship between the inclined surface of the annular member 133 and the clamp member 131 is increased. Can be canceled. Thereby, the urging force of the coil spring 134 is not transmitted to the clamp member 131, and the urging force of the coil spring 134 acting on the clamp shaft 123 can be released. By reducing the urging force for holding the clamp shaft 123, the holding of the clamp shaft 123 can be released, and the clamp shaft 123 can be detached from the spindle 120. Thereby, the blade 200 can be removed. The engagement pin 141 and the clamp shaft holding / releasing member 142 are an implementation configuration example corresponding to the “biasing force releasing member” in the present invention.

  On the other hand, when the blade 200 is mounted, the cam lever 150 is turned from the release position to the clamp position with the blade 200 disposed between the flange 121 and the clamp head 124 and the clamp shaft 123 inserted into the spindle 120. . As the cam lever 150 turns, the thrust pin 140 and the annular member 133 move upward in the longitudinal direction of the spindle 120 by the biasing force of the coil spring 134. The inclined surface of the annular member 133 and the inclined surface 131a of the clamp member 131 are engaged, and the urging force of the coil spring 134 is converted into the urging force in the radial direction of the spindle 120. Accordingly, the clamp member 131 is moved toward the center of the spindle 120 in the radial direction, and the convex portion of the clamp member 131 and the engagement groove of the clamp shaft 123 are engaged to hold the clamp shaft 123. At this time, the urging force of the coil spring 134 holds the clamp shaft 123 via the clamp member 131 and moves the clamp shaft 123 upward so that the clamp head 124 moves in a direction close to the flange 121. Let Thereby, the blade 200 is held between the flange 121 and the clamp head 124.

  In the electric vibration 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 forms a predetermined angle in the circumferential direction around the spindle 120 (hereinafter referred to as the B direction) indicated by the arrow B around the spindle connecting portion 115. Converted to rotational motion. As a result, the spindle 120 connected to the spindle connecting portion 115 is driven to reciprocate in the B direction. As a result, the blade 200 sandwiched between the flange 121 and the clamp head 124 can be vibrated to perform processing such as cutting on the workpiece.

  According to the above embodiment, the clamp shaft 123 can be removed and the blade 200 can be replaced simply by turning the cam lever 150. That is, the blade 200 can be easily replaced without using a special tool. Further, when the thrust pin 140 moves and moves the clamp shaft 123 downward in the long axis direction of the spindle 120, the clamp shaft 123 is released from being held by the clamp shaft holding / release member 142 engaged with the thrust pin 140. be able to. Therefore, the clamp shaft 123 can be removed, that is, the blade 200 can be replaced by a simpler operation simply by moving the cam lever 150 from the clamp position to the release position.

  Further, according to the present embodiment, the clamp shaft 123 disposed inside the spindle 120 can be held by the urging force of the O-ring 132 or the coil spring 134 disposed outside the spindle 120. Can be thinned. Therefore, the spindle 120 is reduced in weight, and the electric vibration tool 100 can be reduced in weight. Further, since the weight of the spindle 120 is reduced by making the spindle 120 thinner, the spindle 120 can be driven with a small rotational output, and the motor 110 can be reduced in size.

  Further, according to the present embodiment, since the clamp shaft 123 is held by the urging force of the O-ring 132 and the urging force of the coil spring 134, the urging force required for each of the O-ring 132 and the coil spring 134 can be appropriately determined. It is possible to increase the degree of freedom in designing the work tool. Further, since the urging force of the coil spring 134 is applied in parallel to the axial direction of the spindle 120, the extension direction of the coil spring 134 is set to the diameter of the spindle 120 so that the urging force of the coil spring 134 directly acts in the radial direction of the spindle 120. Compared with the case where the direction is matched, the size of the electric work tool 100 in the radial direction of the spindle 120 can be suppressed.

  Further, according to the present embodiment, the biasing force of the coil spring 134 acting in parallel with the axial direction of the spindle 120 can be applied in the radial direction of the spindle 120 by a simple configuration in which the inclined surfaces of the clamp member 131 and the annular member 133 are engaged. Can be converted. Furthermore, the urging force of the coil spring 134 not only holds the clamp shaft 123 but also urges the clamp head 124 of the clamp shaft 123 in the longitudinal direction of the spindle 120 in a direction close to the flange 121 of the spindle 120. That is, since the coil spring 134 has two functions of holding the clamp shaft 123 and urging the clamp shaft 123 in the long axis direction, the number of parts of the electric vibration tool 100 can be reduced.

  Moreover, according to this embodiment, since the coil spring 134 is held by the bearing 125, it is not necessary to separately provide a member for holding the coil spring 134, and the number of parts of the electric vibration tool 100 can be reduced. . That is, the electric vibration tool 100 can be reduced in size.

  In addition, in the rotating member supported by the two bearings, the space between the two bearings in the axial direction tends to be a dead space anyway. Therefore, according to the present embodiment, since the coil spring 134 is disposed between the bearings 125 and 126 in the long axis direction of the spindle 120, the dead space can be used effectively, and thereby the electric vibration The tool 100 can be reduced in size.

  In the above embodiment, the flange 121 is separate from the spindle 120 and is configured to be attached to the spindle 120, but may be configured integrally with the spindle 120. In addition, the clamp head 124 is configured integrally with the clamp shaft 123, but the clamp head 124 may be configured to be attached to the clamp shaft 123 separately from the clamp shaft 123.

  In the present embodiment, both the tip of the spindle 120 and the flange 121 sandwich the blade 200 together with the clamp head 124, but either the tip of the spindle 120 or the flange 121 faces the clamp head 124. Then, the blade 200 may be clamped. That is, the blade 200 may be sandwiched between the flange 121 and the clamp head 124. On the other hand, the flange 121 is not provided, and the blade 200 is sandwiched between the tip of the spindle 120 and the clamp head 124. It may be configured to.

  In this embodiment, the O-ring 132 and the coil spring 134 urge the clamp member 132 in the radial direction of the spindle 120, but only one of the O-ring 132 and the coil spring 134 is the clamp member 132. The other of the O-ring 132 and the coil spring 134 may not be provided.

  Further, the configuration is not limited to the configuration in which the clamp shaft holding mechanism 130 is provided so that the urging force of the coil spring 134 holds the clamp shaft 123. In other words, the clamping shaft 123 may be biased in the direction approaching the flange 121 without holding the clamping shaft 123 by the biasing force of the coil spring 134.

  In the above description, the blade 200 is used as the tip tool. However, as shown in FIG. 8, other types of tip tools such as the polishing pad 201 may be attached as the tip tool. In this embodiment, the coil spring 134 is used as the biasing member. However, as shown in FIG. 8, a plurality of disc springs 135 may be stacked as the biasing member. In this case, the disc spring 135 may be one. Moreover, you may use another kind of spring as a biasing member. Other than the spring, any member that generates a restoring force by elastic deformation may be rubber, resin, or the like.

  In addition, the electric vibration tool 100 has been described as the work tool. However, the work tool is not limited to this, and any work tool that clamps the tip tool may be a work tool that rotates the tip tool, such as a grinder or a circular saw. Also, the present invention can be applied.

100 Electric vibration tool (work tool)
DESCRIPTION OF SYMBOLS 101 Main body housing 102 Drive mechanism 103 Tip tool holding mechanism 110 Motor 111 Output shaft 112 Eccentric shaft 114 Driven arm 120 Spindle (first shaft)
121 Flange (first clamp part)
122a Clamp member insertion hole (opening)
122b engagement pin insertion hole 123 clamp shaft (second shaft)
124 Clamp head (second clamp part)
125 Bearing (support member)
126 Bearing (support member)
130 Clamp shaft holding mechanism 131 Clamp member (holding member, cross direction moving member)
132 O-ring (biasing member)
133 annular member (holding member, axially moving member)
134 Coil spring (biasing member)
135 Belleville spring (biasing member)
140 Thrust pin (transition member)
141 engaging pin (transition member, biasing force release member)
142 Clamp shaft holding release member (biasing force release member)
150 Cam lever 200 Blade (tip tool)
201 Polishing pad (tip tool)

Claims (11)

A first shaft having a first clamp portion;
A second shaft having a second clamp portion;
A work tool for driving a tip tool sandwiched between the first clamp part and the second clamp part,
The first shaft and the second shaft are arranged in parallel to each other in the axial direction, and the second shaft is arranged inside the first shaft,
An urging member for generating an urging force for holding the second shaft is provided outside the first shaft. The work tool according to claim 1,
The first shaft has an opening that opens in a crossing direction intersecting the axial direction in an intermediate region in the axial direction;
A work tool comprising a holding member that transmits an urging force of the urging member to the second shaft through the opening. The work tool according to claim 2,
The biasing member is configured to apply the biasing force in parallel with the axial direction of the first shaft,
The work tool is characterized in that the holding member holds the second shaft by converting the biasing force into a force in a direction toward the second shaft in the crossing direction. The work tool according to claim 3,
The holding member has an axial movement member that moves in the axial direction of the first shaft in response to the biasing force, and a cross direction movement member that engages with the axial movement member and moves in the cross direction. And
The work tool, wherein the holding member converts the biasing force into a force in a direction toward the second shaft in the crossing direction, and the crossing direction moving member holds the second shaft. The work tool according to any one of claims 2 to 4,
A transition member that is arranged to be movable in parallel with the axial direction of the first shaft or the second shaft, and that relatively moves the first shaft and the second shaft in the axial direction;
An urging force release member that engages with the displacement member and moves with the movement of the displacement member;
The biasing force releasing member releases the holding of the second shaft by the holding member when the transition member moves so as to move the first shaft and the second shaft in a direction in which they are separated in the axial direction. Thus, the working tool is configured to move the biasing member. The work tool according to any one of claims 1 to 5,
A support member for rotatably supporting the first shaft;
The working tool, wherein the first shaft is supported by the support member at two locations in the axial direction. The work tool according to claim 6,
One end of the urging member is in contact with the support member and is held rotatably with the first shaft. A first shaft having a first clamp portion;
A second shaft having a second clamp portion;
An urging member that urges the first clamp part and the second clamp part in the approaching direction;
A work tool for driving a tip tool sandwiched between the first clamp part and the second clamp part,
The first shaft and the second shaft are arranged in parallel to each other in the axial direction, and the second shaft is arranged inside the first shaft,
The first shaft is rotatably supported by two support members at two locations in the axial direction, and the biasing member is disposed between the two support members in the axial direction. Work tool to do. The work tool according to claim 8,
The work tool according to claim 1, wherein the biasing member is disposed outside the first shaft. The work tool according to claim 8 or 9, wherein
One end of the urging member is in contact with the support member and is held rotatably with the first shaft. It is a work tool given in any 1 paragraph of Claims 8-10,
The work tool characterized in that the biasing member is configured to generate a biasing force for holding the second shaft.

Images