JP2017039178A - Work tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a more rational technique for improving the design freedom of a work tool. A work tool 100 includes a spindle 124 that transmits a driving force of a motor 115 to a tip tool 145, a holding position that holds the tip tool 145, and an open position that opens the tip tool 145. A tip tool holding member 127 configured to be movable in the direction 124a, a lock mechanism 130 for locking the tip tool holding member 127 placed in the holding position, and a main body housing 101. The lock mechanism 130 is a spindle With respect to the rotation axis direction 124 a, it is disposed between the other end 1241 of the spindle 124 and the wall portion constituting the main body housing 101. [Selection] Figure 3

Description

  The present invention relates to a work tool that drives a tip tool to perform a predetermined machining operation on a workpiece.

  European Patent No. 1737616 discloses a hand-held work tool that transmits a driving force of a drive motor to a spindle to drive a tip tool. In the work tool, the tip tool is held by a clamp shaft that passes through the spindle. The clamp shaft is configured to be movable between a holding position for holding the tip tool and an open position for releasing the tip tool, and when the clamp shaft is in the holding position, a lock mechanism disposed in the spindle; It is configured to engage.

EP 1737616

In the work tool, since the clamp shaft locked by the lock mechanism holds the tip tool, the worker can stably perform a predetermined work. Also, by placing the clamp shaft in the open position, the operator can easily change the tip tool.
On the other hand, in the work tool, since the lock mechanism is arranged in the spindle, the degree of freedom in design of the spindle and the lock mechanism is suppressed, and a further arrangement as a member arrangement structure for designing a desired work tool is provided. It was requested.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a more rational technique for improving the design freedom of a work tool.

In order to solve the above-described problems, a work tool according to the present invention is a work tool that drives a tip tool to perform a predetermined machining operation on a workpiece, and includes a motor, a spindle, and a tip tool holding member. And a lock mechanism and a main body housing.
The spindle is configured to transmit the driving force of the motor to the tip tool. The spindle is formed in a hollow shape and has one end and the other end in the spindle rotation axis direction.
The tip tool holding member is configured to be movable in the spindle rotation axis direction between a holding position for holding the tip tool and an open position for releasing the tip tool. The tip tool holding member includes a spindle inner region disposed in the spindle, a tip tool fastening region extending from one end of the spindle and configured to be fastened to the tip tool, and the other end of the spindle. And an engagement region configured to be engageable with the lock mechanism.
The locking mechanism is configured to engage the tip tool holding member placed in the holding position and lock the tip tool holding member.
The main body housing constitutes at least a part of the outline of the work tool.
In the work tool having the above-described configuration, the lock mechanism is disposed between the other end portion of the spindle and the wall portion constituting the main body housing in the spindle rotation axis direction.

With the above-described configuration, in the work tool according to the present invention, the lock mechanism and the spindle are arranged at positions separated from each other. That is, since the spindle structure can be uniquely designed without depending on the lock mechanism, for example, the spindle can be downsized.
In addition, since the components of the lock mechanism can be assembled into an assembly, the lock mechanism can be easily assembled, and only the lock mechanism assembly can be removed from the main body housing, improving workability in repairs. Can be planned.

  In the work tool according to the present invention, typically, the spindle is rotationally driven by a motor, and the tip tool is reciprocated with respect to a predetermined angle range around the spindle rotation axis around the spindle rotation axis. That is, the tip tool is reciprocally driven in an arc shape around the spindle rotation axis. The tip tool suitably includes a plurality of types of tools such as a cutting tool for cutting a workpiece and a grinding tool for grinding a workpiece. Accordingly, the reciprocating drive (vibration) of the tip tool within a predetermined angle range causes the tip tool to perform a cutting operation or a grinding operation. This work tool is also called a vibration tool.

Moreover, according to the further form of the working tool which concerns on this invention, it can have the urging | biasing member arrange | positioned between the other edge part of a spindle, and a lock mechanism. In this configuration, the urging member urges the locking mechanism engaged with the tip tool holding member toward the engagement region, so that the tip tool is sandwiched between the tip tool fastening region and the spindle, The tip tool can be fastened to the tip tool fastening region.
As a specific example of the configuration in which the tip tool is sandwiched between the tip tool fastening region and the spindle, a flange-shaped clamp head is provided at the end of the tip tool fastening region, and the end of the spindle facing the clamp head (one end) Part) can be provided with a flange-like tool holding part. With this configuration, the tip tool can be clamped between the clamp head and the tool holding portion.
Furthermore, in the region (engagement region) between the spindle and the lock mechanism, a hollow support member penetrating the tip tool holding member can be provided. The support member may have a flange for supporting one end portion of the urging member in the spindle rotation axis direction. In the configuration, the other end portion of the urging member is supported by the lock mechanism. Can do.

Further, according to the further form of the work tool according to the present invention, the lock mechanism includes an engagement position that engages the tip tool holding member to lock the tip tool holding member at the holding position, and a tip tool holding member. A clamp member configured to be movable between a release position for releasing the engagement and a collar member for supporting the clamp member can be provided. In this configuration, in the crossing direction, which is a direction crossing the spindle rotation axis direction, the collar member can constitute a long color member region formed longer than the length of the spindle.
According to the work tool which concerns on this form, the other end part of the urging | biasing member mentioned above can be efficiently supported by comprising a collar member elongate area | region. In other words, it is possible to configure the biasing member support region in the lock mechanism.

Moreover, according to the further form of the working tool which concerns on this invention, a biasing member can be comprised with a coil spring. In this configuration, the coil spring long region can be formed in the coil spring by forming the outer diameter of the coil spring larger than the outer diameter of the spindle. In addition, a coil spring elongate area | region is comprised in the crossing direction.
According to the work tool according to the present invention, since the biasing member and the spindle are arranged in different regions, a desired coil spring can be used as the biasing member. For example, in the work tool according to the present embodiment, a coil spring having a long coil spring region can be used, so that the above-described support member can be disposed in the inner region of the coil spring.

According to the further form of the work tool concerning the present invention, it has a transmission member which transmits the driving force of the motor to the spindle, and the motor is arranged so that the motor rotation axis direction is parallel to the spindle rotation axis direction. be able to. In this configuration, the transmission member and the spindle can be disposed closer to the tip tool fastening region than the motor.
According to the work tool according to the present embodiment, by providing the fixed position (fixed portion) between the transmission member and the spindle closer to the tip tool fastening region than the motor, the spindle can be shortened in the spindle rotation axis direction. .
In addition, since the position of the tip tool and the transmission member can be close to each other with respect to the spindle rotation axis direction, couple force generated according to the distance between the tip tool and the transmission member is reduced, and vibration caused by the action of the tip tool on the workpiece is suppressed. can do.
Typically, the motor can have an eccentric shaft portion provided with a drive bearing, and the transmission member can have a pair of arm portions sandwiching the drive bearing and a fixed portion fixed to the spindle. it can. In this case, the transmission member can be configured in a substantially linear shape. According to this configuration, the tip tool can perform a reciprocating motion by transmitting the motion of the arm portion rotated in an arc shape by the eccentric shaft portion to the spindle via the fixed portion. In this configuration, the transmission member can be arranged by effectively utilizing the space formed between the eccentric shaft portion and the spindle.

According to the further form of the work tool concerning the present invention, it has a transmission member which transmits the driving force of a motor to a spindle, and the transmission member is fixed to an arm part which receives the driving force of a motor, and a spindle. And a fixing part. In this configuration, the motor is arranged such that the motor rotation axis direction intersects the spindle rotation axis direction, and the fixing portion and the spindle are arranged on the tip tool fastening region side of the motor.
The work tool according to this embodiment can reduce the length of the spindle in the direction of the spindle rotation axis by providing the fixing portion closer to the tip tool fastening region than the motor.
In addition, since the position of the tip tool and the transmission member can be close to each other with respect to the spindle rotation axis direction, couple force generated according to the distance between the tip tool and the transmission member is reduced, and vibration caused by the action of the tip tool on the workpiece is suppressed. can do.
Typically, the motor can have an eccentric shaft portion provided with a drive bearing, and the arm portion can be constituted by a pair of members that sandwich the drive bearing. In the transmission member, the arm part is arranged on the engagement area side, and the fixing part is arranged on the tip tool fastening area side. However, in order to effectively use the space surrounded by the motor, the transmission member and the spindle, A region between the arm portion and the fixed portion of the member can be a curved shape or a crank shape.

Moreover, according to the further form of the working tool which concerns on this invention, a clamp member and the said collar member can have a slidable contact area | region which mutually slidably contacts. Furthermore, the slidable contact region can have a first inclined element that is inclined with respect to the spindle rotational axis direction and a second inclined element that is inclined with respect to the spindle rotational axis direction. In this configuration, the first tilt element and the second tilt element can be arranged so as to be separated from each other with respect to the spindle rotation axis direction.
By moving the clamp member and the collar member in sliding contact with each other, the clamp member can be moved between the engagement position and the release position. Typically, the inclination of the first inclination element and the second inclination element has an inclination in which the side closer to the spindle rotation axis is on the lower side and the direction away from the spindle rotation axis is on the upper side. it can. When the clamp member moves from the upper side to the lower side with respect to the collar member, the clamp member moves in the direction close to the spindle rotation axis in the intersecting direction along the inclination of the first inclined element and the second inclined element (inward direction). ). Accordingly, the clamp member can be placed at the engagement position. On the other hand, when the clamp member moves from the lower side to the upper side with respect to the collar member, the clamp member moves away from the spindle rotation axis in the intersecting direction along the inclination of the first inclined element and the second inclined element ( It can be moved in the outward direction). Accordingly, the clamp member can be placed at the release position.
In other words, the upper end and the lower end for ensuring relative movement over a predetermined distance between the clamp member and the collar member, and a continuous region in which the upper end and the lower end are continuous are set in the inclination of the sliding contact area. There is a need. When the sliding contact area has only a single inclination, only one upper end, lower end, and continuous area are set. On the other hand, when the first inclined element and the second inclined element are provided, the upper end, the lower end, and the continuous region can be provided on the first inclined element and the second inclined element, respectively, and the cross direction , The lower end of the first inclined element and the upper end of the second inclined element can be brought close to each other. Accordingly, a straight line on the crossing direction connecting the upper end of the first inclined element and the lower end of the second inclined element is arranged on the crossing direction connecting the upper end and the lower end in the configuration in which the sliding contact region has only a single inclination. It becomes possible to set shorter than a straight line.
That is, the work tool according to the present embodiment can shorten the locking mechanism in the crossing direction.

Note that the sliding contact region (first inclined element or second inclined element) is configured by a linear shape, a curved shape, a shape formed by a combination of a plurality of continuous linear shapes, a shape formed by a combination of a plurality of continuous curved shapes, or the like. Can do. A typical example of the curved shape is an arc shape.
The fact that the sliding contact area is inclined with respect to the spindle rotation axis direction indicates that the extended line of the sliding contact area intersects the spindle rotation axis at a predetermined angle. The extension line of the slidable contact area indicates the linearly extended line when the slidable contact area has a linear shape, and indicates the normal line of the circular arc shape when the slidable contact area has an arc shape. In addition, when the sliding contact area is a combination of a plurality of continuous linear shapes or a combination of a plurality of continuous curved shapes, the extension line of the straight line connecting the upper end portion and the lower end portion of the sliding contact region is the extension line of the sliding contact region. It can be.
The predetermined angle formed by the first inclined element with respect to the spindle rotational axis direction and the predetermined angle formed by the second inclined element with respect to the spindle rotational axis direction may be the same or different. Also good.

Moreover, according to the further form of the working tool which concerns on this invention, a collar member has an inner area | region which has a hole for inserting the engagement area | region of a tip tool holding member while a clamp member is arrange | positioned, and a cross direction And an outer region formed outside the inner region. In the said structure, the bearing arrangement | positioning area | region for arrange | positioning the bearing which supports a collar member rotatably can be comprised in an outer side area | region.
When the collar member is in the engaging position, the collar member is rotated by rotating the tip tool holding member with the rotation of the spindle by the motor. In order to stably support the rotation of the collar member, the bearing is disposed. However, according to the work tool according to the present embodiment, the bearing is disposed in the outer region of the collar member, so that the lock mechanism has a compact structure. Therefore, it is possible to contribute to downsizing of the work tool.

Moreover, according to the further form of the working tool which concerns on this invention, the collar member accept | permits allowing a clamp member to move to a release position from a maintenance position which maintains a clamp member in an engagement position from an engagement position It can be configured to be movable between positions. In this configuration, the work tool can further include an operation mechanism configured to move the collar member between the maintenance position and the allowable position by manual operation by the user. The operation mechanism may have a contact portion that moves the collar member from the allowable position to the maintenance position.
Typically, the contact portion can be constituted by a cam portion connected to a handle portion operated by a user.
According to the work tool according to this embodiment, since the operation mechanism directly contacts the collar member, the number of parts can be reduced, and the work tool can be downsized.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the more rational technique for improving the design freedom of a working tool.

1 is a perspective view showing an external appearance of an electric vibration tool according to a first embodiment of the present invention. It is sectional drawing which shows the internal mechanism of the said electric vibration tool. It is an expanded sectional view showing the important section of the electric vibration tool concerned. It is an expanded sectional view which shows the locking mechanism of the said electric vibration tool. It is sectional drawing which shows the state which faced the said electric tool from the front side. It is an external view which shows operation | movement in the case of exchanging a front-end tool. It is an expanded sectional view showing operation of a lock mechanism in the case of exchanging a tip tool. It is sectional drawing which shows operation | movement of the lock operation mechanism in the case of exchanging a front-end tool. It is sectional drawing which shows the internal mechanism of the electrically driven vibration tool which concerns on 2nd Embodiment of this invention. It is an expanded sectional view showing the important section of the electric vibration tool concerned.

An embodiment of a work tool according to the present invention will be described with reference to FIGS. FIGS. 1-8 is a figure which shows the work tool which concerns on 1st Embodiment, and FIG. 9 and FIG. 10 are figures which show the work tool which concerns on 2nd Embodiment.
In addition, in the work tool according to the second embodiment, the same name is used and the same reference numeral is used for parts and mechanisms that have substantially the same or similar functions as the parts and mechanisms of the work tool according to the first embodiment. A description thereof will be omitted.

(First embodiment)
1st Embodiment of this invention is described based on FIGS. In the first embodiment, an electric vibration tool will be used as a work tool. As shown in FIG. 1, the electric vibration tool 100 selectively attaches a plurality of types of tip tools such as a blade and a polishing pad, and vibrates the attached tip tools so that the workpiece is vibrated. Processing such as cutting and polishing according to the type of tool. As an example of the tip tool, a blade 145 is attached in FIG.
1 to 5 show a state where the electric vibration tool 100 is attached with the blade 145, and FIGS. 6 to 8 show a state where the electric vibration tool 100 attaches and detaches the blade 145.

(Outline of electric vibration tool)
As shown in FIG. 1, the electric vibration tool 100 includes a resin main body housing 101 that forms an outline of the electric vibration tool 100. The main body housing 101 is an example embodiment that corresponds to the “main body housing” according to the present invention. A blade 145 is detachably mounted on one end side of the main body housing 101 with respect to the extending direction of the main body housing 101, and a battery mounting portion 109 to which the battery 190 is detachably mounted is provided on the other end side of the main body housing 101. ing. The battery 190 is configured to be detachable from the battery mounting unit 109.

  As shown in FIG. 1, the main body housing 101 constitutes a grip portion 107 held by an operator. The grip portion 107 is formed in an elongated shape in an intermediate region 1012 between the front region 1011 and the rear region 1013 of the main body housing 101. The battery 190 is attached to and detached from the battery mounting portion 109 by sliding in the direction intersecting the extending direction of the grip portion 107. A slide switch 108 is provided at a position where a thumb is expected to be placed when the user grips the grip portion 107. The slide switch 108 and the battery mounting portion 109 are electrically connected to the controller 180 (see FIG. 2). Therefore, by operating the slide switch 108, ON / OFF of the drive motor 115 (see FIG. 2) is switched. The ON operation of the slide switch 108 selects a first mode in which the drive motor 115 is driven at a predetermined rotational speed and a second mode in which the drive motor 115 is driven at a higher rotational speed than the first mode. Can do. The controller 180 controls the drive motor 115 based on the operation of the slide switch 108.

As shown in FIG. 2, the electric vibration tool 100 includes a drive mechanism 120 that drives the blade 145 and a lock mechanism 130 that allows the blade 145 to be attached to and detached from the main body housing 101. The lock mechanism 130 is operated by the lock operation mechanism 150 shown in FIG. The lock operation mechanism 150 is an example of the “operation mechanism” according to the present invention. As shown in FIG. 1, the lock mechanism 150 includes a handle portion 151 disposed outside the front region 1011, and a rotating shaft portion that is coupled to the handle portion 151 in the front region 1011 and disposed inside the main body housing 101. 1513. The handle portion 151 includes a grip portion 1511 that is gripped by the user and a pair of arm portions 1512 that extend from the grip portion 1511. The rotation shaft portion 1513 is provided across one arm portion 1512 and the other arm portion 1512 and is connected to each arm portion 1512.
The position of the handle portion 151 shown in FIG. 1 constitutes a blade fixing position, and the position of the handle portion 151 shown in FIG. 6 constitutes a blade replacement position. In other words, when the handle portion 151 is at the blade fixing position, the blade 145 is locked to the electric vibration tool 100 by the lock mechanism 130. When the handle portion 151 is in the blade replacement position, the blade 145 is unlocked by the lock mechanism 130, so that the blade 145 can be attached to and detached from the electric vibration tool 100.

FIG. 2 is a cross-sectional view of the electric vibration tool 100. The main body housing 101 accommodates the inner housing 110. The inner housing 110 includes a first inner housing 1101 and a second inner housing 1102. The first inner housing 1101 and the second inner housing 1102 are both made of metal and are connected by a connecting member 1103 such as a screw. A predetermined space region 1104 is formed between the first inner housing 1101 and the second inner housing 1102.
The inner housing 110 is connected to the main body housing 101 via a plurality of elastic members 111. The elastic member 111 can suppress transmission of vibration generated in the inner housing 110 to the main body housing 101.
As shown in FIG. 2, the first inner housing 1101 accommodates the drive mechanism 120 and the lock mechanism 130. The lock mechanism 130 is an example of the “lock mechanism” according to the present invention. Further, as shown in FIG. 5, the rotation shaft portion 1513 of the lock operation mechanism 150 is disposed so as to penetrate the space region 1104.

As shown in FIG. 2, the drive mechanism 120 has a spindle 124 configured to be rotatable. The spindle rotation axis direction 124a defines an intersecting direction 124b that is a direction intersecting with the spindle rotation axis direction 124a. The spindle 124 is an example of the “spindle” according to the present invention, the spindle rotation axis direction 124a is an example of the “spindle rotation axis direction” according to the present invention, and the intersecting direction 124b is the “cross direction” according to the present invention. It is an example.
In the electric vibration tool 100, the extending direction of the grip portion 107 defines the longitudinal direction 100a. In the vibration tool crossing direction, which is a direction crossing the longitudinal direction 100a, the direction parallel to the spindle rotation axis direction 124a defines the height direction 100b. Further, in the vibration tool crossing direction, the direction crossing both the height direction 100b and the longitudinal direction 100a defines the width direction 100c. The longitudinal direction 100a defines a front side 100a1 on which the blade 145 is disposed and a rear side 100a2 on the opposite side of the front side 100a1. The height direction 100b defines a lower side 100b2 on which the blade 145 is disposed and an upper side 100b1 on the opposite side of the lower side 100b2.

(Drive mechanism)
As shown in FIG. 2 or FIG. 3, the drive mechanism 120 is configured as a mechanism that drives the blade 145. The drive mechanism 120 is mainly composed of a drive motor 115, an eccentric shaft 121, a drive bearing 122, a driven arm 123, a spindle 124, and a clamp shaft 127. The drive motor 115 is an example of the “motor” according to the present invention, the driven arm 123 is an example of the “transmission member” according to the present invention, and the clamp shaft 127 is the “tip tool holding member” according to the present invention. It is an example.

As shown in FIG. 3, the drive motor 115 is configured as a brushless motor. The drive motor 115 is disposed such that the output shaft portion 117 extends in the height direction 100b. That is, the drive motor 115 is disposed in the inner housing 110 such that the motor rotation axis direction 117a is parallel to the spindle rotation axis direction 124a.
The eccentric shaft portion 121 is attached to the tip of the output shaft portion 117 of the drive motor 115, and includes an eccentric portion 1211 that is eccentric with respect to the motor rotation axis direction 117a. The eccentric shaft 121 is rotatably supported by a bearing 121a on the upper side 100b1 and a bearing 121b on the lower side 100b2. The bearings 121a and 121b are held by the first inner housing 1101. A drive bearing 122 is provided on the outer periphery of the eccentric portion 1211. The drive bearing 122 is disposed between the bearing 121a and the bearing 121b with respect to the height direction 100b.

As shown in FIG. 3, the driven arm 123 extends in the longitudinal direction 100 a and is provided so as to connect the drive bearing 122 and the spindle 124. A pair of arm portions 1231 is formed in the region of the rear side 100 a 2 in the driven arm 123. The pair of arm portions 1231 are provided so as to contact the outer peripheral portion of the drive bearing 122 in the width direction 100c. A fixed portion 1232 that surrounds and fixes a predetermined region of the spindle 124 is formed in the region of the front side 100 a 1 in the driven arm 123.
The driven arm 123 and the spindle 124 are disposed on the lower side 100b2 from the drive motor 115. With this configuration, the drive mechanism 120 can be shortened in the spindle rotation axis direction 124a.
Further, with this configuration, the position of the driven arm 123 for driving the blade 145 and the spindle 124 can be made closer to each other with respect to the spindle rotation axis direction 124a. Therefore, the couple generated according to the distance between the driven arm 123 and the blade 145 is reduced. Thereby, the vibration which arises by the effect | action of the blade 145 with respect to a workpiece at the time of a process operation is suppressed.

  As shown in FIG. 3, the spindle 124 is a hollow, substantially cylindrical long member, and has a flange-like tool holding portion 126 for holding the blade 145 together with the clamp shaft 127 on the lower side 100b2. The spindle 124 is rotatably supported by a bearing 124c on the upper side 100b1 and a bearing 124d on the lower side 100b2. The bearings 124 c and 124 d are held by the inner housing 110.

As shown in FIG. 3, the clamp shaft 127 is a substantially cylindrical member that can be inserted into the spindle 124. When the clamp shaft 127 is inserted into the spindle 124, the clamp shaft 127 has an in-spindle region 1271 disposed in the spindle 124 and a fastening region 1273 extending from the lower end 1242 of the spindle 124. And an engagement region 1272 extending from the upper end 1241 of the spindle 124. The in-spindle region 1271 is an example of the “inside spindle region” according to the present invention, the fastening region 1273 is an example of the “fastening region” according to the present invention, and the engaging region 1272 is the “engaging region” according to the present invention. The lower end 1242 of the spindle 124 is an example of “one end” according to the present invention, and the upper end 1241 of the spindle 124 is an example of “the other end” according to the present invention. It is.
As shown in FIG. 3, the fastening region 1273 is provided with a flange-shaped clamp head 128 formed integrally. In addition, a clamp member engagement groove 129 is formed in the engagement region 1272. When the clamp shaft 127 is inserted into the spindle 124 and held by the lock mechanism 130, the blade 145 is sandwiched between the clamp head 128 of the clamp shaft 127 and the tool holding portion 126 of the spindle 124.

  When the drive motor 115 is driven, the center of the eccentric part 1211 rotates around the motor rotation axis direction 117a by the rotation of the output shaft part 117. As a result, the drive bearing 122 is reciprocated in the width direction 100c, and the driven arm 123 is reciprocated in an arc shape around the rotation axis of the spindle 124. As a result, the blade 145 sandwiched between the spindle 124 and the clamp shaft 127 is reciprocated in an arc shape so that a predetermined processing operation (for example, cutting) can be performed.

(Lock mechanism and urging mechanism)
Next, the lock mechanism 130 and the urging mechanism 140 will be described with reference to FIGS. 4 is an enlarged cross-sectional view showing the lock mechanism 130, and FIG. 5 is a front cross-sectional view showing the lock mechanism 130 and the urging mechanism 140. The lock mechanism 130 is a mechanism that holds the clamp shaft 127, and the biasing mechanism 140 is a mechanism that biases the clamp shaft 127 from the lower side 100b2 to the upper side 100b1. The lock mechanism 130 and the urging mechanism 140 are both disposed in the first inner housing 1101, but the area of the first inner housing 1101 in which the lock mechanism 130 and the urging mechanism 140 are disposed is configured in a cylindrical shape. Yes.

As shown in FIG. 4, the lock mechanism 130 mainly includes a clamp member 131, a collar member 135, a first coil spring 134, a lid member 137, and a bearing 135 a, and these components constitute a lock mechanism assembly 1301. To do. The clamp member 131 is an example of the “clamp member” according to the present invention, the collar member 135 is an example of the “collar member” according to the present invention, and the bearing 135a is an example of the “bearing” according to the present invention.
As shown in FIG. 3, the urging mechanism 140 is mainly composed of a support member 141 and a second coil spring 142. The second coil spring 142 is an example of the “biasing member” according to the present invention.

Based on FIG. 3 and FIG. 5, the structure of the urging mechanism 140 will be described. The support member 141 is a hollow, substantially cylindrical member that passes through the engagement region 1272 of the clamp shaft 127, and is rotatably supported by a bearing 124c. The bearing 124c is configured to support both the spindle 124 and the support member 141. With this configuration, it is possible to reduce the number of bearing parts and reduce the length in the spindle rotation axis direction 124a.
In the support member 141, a flange-like coil spring support portion 1411 with which the lower end portion of the second coil spring 142 abuts is formed on the lower side 100b2, and a clamp member support for supporting the clamp member 131 is formed on the upper side 100b1. A portion 1412 is formed. As will be described later, the clamp member support portion 1412 supports the clamp member 131 in a state where the clamp member 131 is placed at a position (release position) when the blade 145 is replaced.

The outer diameter of the second coil spring 142 has a long region 1421 configured to be larger than the outer diameter of the spindle 124. Since the second coil spring 142 has the coil spring long region 1421, the support member 141 can be disposed in the inner region of the second coil spring 142. This coil spring long region 1421 is an example embodiment that corresponds to the “coil spring long region” according to the present invention.
As described above, in the second coil spring 142, the end of the lower side 100b2 contacts the support member 141, and the end of the upper side 100b1 contacts the collar member 135. That is, the second coil spring 142 is disposed between the upper end portion 1241 of the spindle 124 and the lock mechanism 130.

Next, the structure of the lock mechanism 130 will be described with reference to FIG. The lock mechanism 130 is disposed between the end portion of the upper side 100b1 of the support member 141 and the main body housing 101 in the spindle rotation axis direction 124a. In other words, it can be said that the lock mechanism 130 is disposed between the upper end portion 1241 of the spindle 124 and the wall portion constituting the main body housing 101. Since the lock mechanism 130 and the spindle 124 have independent configurations and are spaced apart from each other, the design of the lock mechanism 130 can be performed without depending on the spindle 124.
Further, since the lock mechanism 130 constitutes the lock mechanism assembly 1301, the lock mechanism 130 can be easily assembled, and only the lock mechanism assembly 1301 can be removed for repair.

As shown in FIG. 4, the clamp member 131 includes a pair of members that sandwich an engagement region 1272 of the clamp shaft 127 in the radial direction of the clamp shaft 127. Each clamp member 131 is configured to be movable in the intersecting direction 124 b, and has a plurality of convex portions that can engage with clamp member engagement grooves 129 formed in the clamp shaft 127 on the inner surface facing the clamp shaft 127. 132 is formed. Further, the clamp member 131 includes a first clamp member inclined portion 1331 and a second clamp member inclined portion 1332 that are inclined with respect to the spindle rotation axis direction 124a. In addition, the inclined surfaces of the first clamp member inclined portion 1331 and the second clamp member inclined portion 1332 are respectively configured in a straight line, and the extended line of the inclined surface of the first clamp member inclined portion 1331 and the spindle rotation axis direction 124a. Is the same as the angle formed by the extended line of the inclined surface of the second clamp member inclined portion 1332 and the spindle rotation axis direction 124a.
In addition, a clamp member inclined connecting portion 1333 is formed between the first clamp member inclined portion 1331 and the second clamp member inclined portion 1332. The clamp member inclined connecting portion 1333 includes a first extending region 1333a extending inward in the intersecting direction 124b from an end of the lower side 100b2 of the first clamp member inclined portion 1331, and an inner end of the first extending region 1333a. To the end of the upper side 100b1 of the second clamp member inclined portion 1332 and a second extending region 1333b extending in the spindle rotation axis direction 124a. By the clamp member inclined connecting portion 1333, the first clamp member inclined portion 1331 and the second clamp member inclined portion 1332 can be arranged at positions separated from each other on the spindle rotating shaft 124a. Further, in the intersecting direction 124b, the end portion of the lower side 100b2 of the first clamp member inclined portion 1331 and the end portion of the upper side 100b1 of the second clamp member inclined portion 1332 are adjacent to each other via the first extending region 1333a. be able to. For this reason, it becomes possible to shorten the 1st clamp member inclination part 1331 and the 2nd clamp member inclination part 1332 in the cross direction 124b.

As shown in FIG. 4, a first coil spring 134 is arranged between each clamp member 131 between the clamp member 131 and the lid member 137. The first coil spring 134 biases the clamp member 131 toward the lower side 100b2, and stabilizes the posture of the clamp member 131.
As shown in FIG. 4, the collar member 135 is a member for controlling clamping of the clamp shaft 127 by the clamp member 131. The collar member 135 is formed on the outer side of the inner region 1351 in the intersecting direction 124b and the inner region 1351 having the hole portion 1352 for inserting the engaging region 1272 of the clamp shaft 127 while the clamp member 131 is disposed. An outer region 1353. The hole 1352 is an example of the “hole” according to the present invention, the inner region 1351 is an example of the “inner region” according to the present invention, and the outer region 1353 is an example of the “outer region” according to the present invention. is there. The lid member 137 is disposed so as to cover the inner region 1351.

The collar member 135 has a collar member long region 1354 formed longer than the spindle 124 in the intersecting direction 124b. The collar member 135 can receive the end of the upper side 100 b 1 of the second coil spring 142 by the collar member long region 1354. This long color member region 1354 is an example of the “long color member region” according to the present invention.
In the outer region 1353 of the collar member 135, a bearing arrangement region 1355 in which a bearing 135a for rotatably supporting the collar member 135 is arranged is formed. This bearing arrangement region 1355 is an example of the “bearing arrangement region” according to the present invention. By providing the bearing arrangement area 1355, it is not necessary to configure the arrangement area of the bearing 135 a in the area of the spindle rotation axis direction 124 a of the collar member 135. Therefore, the spindle length direction 124 a of the collar member 135 can be shortened. It becomes possible.
The bearing arrangement region 1355 is provided in a cutout shape on the outer periphery of the collar member 135. Thereby, the bearing 135a can be compactly arranged with respect to the collar member 135.

  The outer peripheral portion of the bearing 135a is slidably disposed on the inner housing 110. With this configuration, the lock mechanism assembly 1301 is movable on the spindle rotation shaft 124a. The outer region 1353 that does not have the bearing 135a has a gap with the inner housing 110. That is, in the lock mechanism assembly 1301, the bearing 135 a constitutes a contact element for the inner housing 110, and the outer region 1353 constitutes a non-contact element for the inner housing 110. With this configuration, it is possible to suppress noise generated when the lock mechanism assembly 1301 is rotated.

  The collar member 135, the clamp member 131, and the bearing 135a are disposed along the intersecting direction 124b. With this configuration, the lock mechanism 130 can be shortened in the spindle rotation axis direction 124a.

As shown in FIG. 4, the collar member 135 has a first collar member inclined portion 1361 and a second collar member inclined portion 1362 that are inclined with respect to the spindle rotation axis direction 124a. In addition, the inclined surfaces of the first collar member inclined portion 1361 and the second collar member inclined portion 1362 are each configured in a straight line, and the extended line of the inclined surface of the first collar member inclined portion 1361 and the spindle rotation axis direction 124a. Is the same as the angle formed by the extended line of the inclined surface of the second collar member inclined portion 1362 and the spindle rotation axis direction 124a.
In addition, a color member inclined connecting portion 1363 is formed between the first color member inclined portion 1361 and the second color member inclined portion 1362. The extending direction of the color member inclined connecting portion 1363 is parallel to the spindle rotation axis direction 124a. With this configuration, the first color member inclined portion 1361 and the second color member inclined portion 1362 are mutually connected on the spindle rotation axis 124a. It can arrange | position in the position which spaces apart. Further, the end portion of the lower side 100b2 of the first collar member inclined portion 1361 and the end portion of the upper side 100b1 of the second collar member inclined portion 1362 are respectively positioned on the spindle rotation axis direction 124a. For this reason, it becomes possible to shorten the 1st color member inclination part 1361 and the 2nd color member inclination part 1362 in the cross direction 124b.

  The first collar member inclined portion 1361 and the first clamp member inclined portion 1331 are configured to be in sliding contact with each other, and the second collar member inclined portion 1362 and the second clamp member inclined portion 1332 are configured to be in sliding contact with each other. That is, the collar member 135 and the clamp member 131 constitute a sliding contact region 130a. This sliding contact area 130a is an example of the “sliding contact area” according to the present invention. In the sliding contact region 130a, the first collar member inclined portion 1361 and the first clamp member inclined portion 1331 constitute a first inclined element 130b, and the second collar member inclined portion 1362 and the second clamp member inclined portion 1332 are second inclined. Configure element 130c. The first inclined element 130b is an example of the “first inclined element” according to the present invention, and the second inclined element 130c is an example of the “second inclined element” according to the present invention.

As shown in FIG. 4, the collar member 135 is urged by the second coil spring 142, the clamp member 131 is urged by the first coil spring 134, and the first collar member inclined portion 1361 becomes the first clamp member. The second collar member inclined portion 1362 comes into contact with the second clamp member inclined portion 1332 while coming into contact with the inclined portion 1331. Thereby, the clamp member 131 is moved toward the inside in the radial direction of the clamp shaft 127. As a result, the two clamp members 131 sandwich the clamp shaft 127 in a state where the convex portion 132 of the clamp member 131 and the clamp member engagement groove 129 of the clamp shaft 127 are engaged. The clamp shaft 127 is urged toward the upper side 100 b 1 by the second coil spring 142 while being clamped by the clamp member 131. As a result, the blade 145 is sandwiched between the clamp head 128 of the clamp shaft 127 and the tool holding portion 126 of the spindle 124.
Note that the position of the clamp shaft 127 in this state defines the holding position for holding the blade 145, the position of the clamp member 131 defines the engagement position for engaging with the clamp shaft 127, and the position of the collar member 135 is the clamp member. A maintenance position for maintaining 131 in the engagement position is defined. The operation when removing the blade 145 from the electric vibration tool 100 will be described later with reference to FIGS. 6 to 8. In this case, the allowable position where the collar member 135 allows the clamp member 131 to move to the release position. The clamp member 131 moves to a release position where the engagement with the clamp shaft 127 is released, and the clamp shaft 127 moves to an open position where the blade 145 is released.

(Lock operation mechanism)
The lock operation mechanism 150 is configured to operate the lock mechanism 130. More specifically, the lock operation mechanism 150 is configured to move the collar member 135 in the spindle rotation axis direction 124a. By moving the collar member 135 in the spindle rotation axis direction 124a, the clamp shaft 127 by the clamp member 131 is switched between engagement and release of both.
1 to 5 show a state in which the lock operation mechanism 150 places the clamp member 131 in the engagement position, and FIGS. 6 to 8 show a state in which the lock operation mechanism 150 can move the clamp member 131 to the release position. Indicates.

As shown in FIG. 5, the rotation shaft portion 1513 connected to the handle portion 151 is placed in a space region 1104 formed between the first inner housing 1101 and the second inner housing 1102. Is arranged penetrating in the width direction 100c. At both ends of the rotation shaft portion 1513, a switching portion 152 configured to be able to contact the collar member 135 is provided. The switching unit 152 includes a first cam unit 1521 and a second cam unit 1522. The first cam portion 1521 includes a first contact portion 1521 a that can contact the collar member 135, and a first notch portion 1521 b that can be separated from the collar member 135. The second cam portion 1522 includes a second contact portion 1522 a that can contact the collar member 135, and a second notch portion 1522 b that can be separated from the collar member 135. The first contact portion 1521a and the second contact portion 1522a are examples of the “contact portion” according to the present invention.
In the rotation shaft portion 1513, a switching connection portion 153 is provided between the first cam portion 1521 and the second cam portion 1522. The switching connecting portion 153 includes an eccentric shaft portion 1531 having a rotation shaft that is eccentric with respect to the rotation shaft of the rotation shaft portion 1513. In other words, the rotation shaft portion 1513 is provided with the switching portion 152 and the switching connecting portion 153. Accordingly, the switching unit 152 and the switching connecting unit 153 are rotated in conjunction with the rotation operation of the handle unit 151.

As shown in FIG. 1, when the handle portion 151 is placed at the blade fixing position, as shown in FIG. 5, the first notch portion 1521b of the switching portion 152 (first cam portion 1521, second cam portion 1522). The second notch 1522b is positioned on the upper side 100b1 of the collar member 135. Therefore, the switching unit 152 is in a state where the collar member 135 is opened. At this time, the collar member 135 is biased toward the upper side 100b1 by the second coil spring 142, and the first collar member inclined portion 1361, the first clamp member inclined portion 1331, the second collar member inclined portion 1362, and the second clamp member inclined. The parts 1332 are in contact with each other. As a result, the clamp member 131 is moved toward the clamp shaft 127, and the clamp shaft 127 is held between the two clamp members 131. Further, the switching connecting portion 153 (eccentric shaft portion 1531) is placed at a position separated from the second inner housing 1102. Accordingly, it is possible to suppress the vibration from being transmitted to the second inner housing 1102 via the switching connecting portion 153.
In this state, as shown in FIG. 4, the clamp member support portion 1412 of the support member 141 is not in contact with the clamp member 131.
As described above, the position of the clamp shaft 127 in this state defines the holding position for holding the blade 145, the position of the clamp member 131 defines the engagement position for engaging with the clamp shaft 127, and the position of the collar member 135 is A maintenance position for maintaining the clamp member 131 in the engagement position is defined.

On the other hand, as shown in FIG. 6, when the handle portion 151 is placed at the blade replacement position, as shown in FIG. 8, the first contact portion 1521 a and the second contact portion 1522 a of the switching portion 152 are connected to the collar member 135. The collar member 135 is moved to the lower side 100b2 against the urging force of the second coil spring 142. As a result, as shown in FIG. 7, the clamp member support portion 1412 of the support member 141 comes into contact with the clamp member 131, and the clamp member 131 is moved to the upper side 100 b 1 relative to the collar member 135.
Note that the area of the collar member 135 where the first contact portion 1521a and the second contact portion 1522a contact each other is a point-symmetrical position with respect to the spindle rotation axis direction 124a. Therefore, since the first contact portion 1521a and the second contact portion 1522a are in contact with a region separated in the intersecting direction 124b in the color member 135, the color member 135 can be stably moved.

By moving the clamp member 131 to the upper side 100b1 relative to the collar member 135, the first clamp member inclined portion 1331 and the first collar member inclined portion 1361 are in contact with each other and the second clamp member inclined portion 1332 and the first The two collar member inclined portions 1362 are released from contact with each other, and the clamp member 131 can move in a direction away from the clamp shaft 127 in the intersecting direction 124b. That is, the clamping force of the clamp shaft 127 by the clamp member 131 is reduced. In this state, the clamp shaft 127 is removed from the spindle 124 by pulling the clamp shaft 127 downward. When the clamping shaft 127 is released, the blade 145 is released. Thereby, the blade 145 as the tip tool can be replaced.
The position of the collar member 135 in this state defines an allowable position that allows the clamp member 131 to move to the release position, and the position of the clamp member 131 defines a release position that releases the engagement with the clamp shaft 127. The position of the shaft 127 defines an open position where the blade 145 is opened.

  As shown in FIG. 8, the switching connecting portion 153 is placed at a position where it abuts on the second inner housing 1102. As a result, the urging force of the second coil spring 142 is received by the second inner housing 1102 via the lock mechanism 130, the switching part 152, and the switching connecting part 153. That is, since the main body housing 101 is configured not to receive the urging force of the second coil spring 142, the main body housing 101 is made of resin, and the weight of the electric vibration tool 100 can be reduced.

  As described above, the blade 145 can be removed by moving the handle portion 151 from the blade fixing position shown in FIG. 1 to the blade replacement position shown in FIG. On the other hand, the blade 145 is clamped between the clamp shaft 127 and the spindle 124 by moving the handle portion 151 from the blade replacement position to the blade fixing position with the clamp shaft 127 fitted with the blade 145 inserted into the spindle 124. be able to.

(Second Embodiment)
An electric vibration tool 200 according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10. The electric vibration tool 200 according to the second embodiment differs from the electric vibration tool 100 according to the first embodiment in the arrangement form of the drive motor 115. That is, as shown in FIG. 9, the drive motor 115 is disposed with respect to the inner housing 110 such that the motor rotation axis direction 117a intersects the spindle rotation axis direction 124a.

Since the drive motor 115 is in this arrangement, the driven arm 123 is formed with a curved region between the arm portion 1231 and the fixed portion 1232 as shown in FIG. The arm portion 1231 extends from the lower side 100b2 toward the upper side 100b1, and has a structure in which the drive bearing 122 is held from the lower side 100b2. By making the driven arm 123 into the curved shape, the space surrounded by the drive motor 115, the eccentric shaft 121, and the spindle 124 inside the main body housing 101 can be effectively utilized.
Further, since the arm portion 1231 reaches the fixing portion 1232 through the curved region, stress concentration in the fixing portion 1232 can be avoided.
The electric vibration tool 200 includes a lock mechanism 130 and a lock operation mechanism 150 corresponding to the electric vibration tool 100 described above. Therefore, even with the electric vibration tool 200, operations and functions similar to those of the electric vibration tool 100 can be achieved.

  In the above, although explained using electric vibration tools 100 and 200, a work tool is not restricted to an electric vibration tool. For example, the present invention may be applied to a work tool in which a tip tool rotates, such as a grinder or a circular saw, as the work tool. Further, although the brushless motor is used as the drive motor 115, a brush motor may be used.

In view of the gist of the present invention, the following modes can be configured for the work tool according to the present invention. Each aspect is used not only alone or in combination with each other, but also in combination with the invention described in the claims.
(Aspect 1)
A support member is disposed between the other end of the spindle and the lock mechanism,
The support member has a coil spring support portion for supporting the biasing member in the lower region,
The coil spring is disposed between the coil spring support and the lock mechanism.
(Aspect 2)
The support member has a clamp member support portion in the upper region for supporting the clamp member when the clamp member is in the release position.
(Aspect 3)
The bearing that supports the spindle is also used as a bearing that supports the support member.
(Aspect 4)
The lock mechanism assembly is disposed in the inner housing so as to be slidable with respect to the spindle rotation axis direction.
(Aspect 5)
In the lock mechanism assembly, the bearing constitutes a sliding contact element for the inner housing, and the collar member constitutes a non-contact element for the inner housing.

(Correspondence between each component of this embodiment and each component of the present invention)
The correspondence between each component of the present embodiment and each component of the present invention is shown as follows. In addition, this embodiment shows an example of the form for implementing this invention, and this invention is not limited to the structure of this embodiment.
The electric vibration tools 100 and 200 are examples of the “work tool” according to the present invention. The blade 145 is an example of the “tip tool” according to the present invention. The main body housing 101 is an example embodiment that corresponds to the “main body housing” according to the present invention. The lock operation mechanism 150 is an example of the “operation mechanism” according to the present invention. The lock mechanism 130 is an example of the “lock mechanism” according to the present invention. The spindle 124 is an example of the “spindle” according to the present invention. The spindle rotation axis direction 124a is an example of the “spindle rotation axis direction” according to the present invention. The crossing direction 124b is an example of the “crossing direction” according to the present invention. The drive motor 115 is an example of the “motor” according to the present invention. The driven arm 123 is an example of the “transmission member” according to the present invention. The clamp shaft 127 is an example of the “tip tool holding member” according to the present invention. The in-spindle area 1271 is an example of the “in-spindle area” according to the present invention. The fastening area 1273 is an example of the “fastening area” according to the present invention. The engagement region 1272 is an example of the “engagement region” according to the present invention. The lower end 1242 of the spindle 124 is an example of “one end” according to the present invention. The upper end 1241 of the spindle 124 is an example of the “other end” according to the present invention. The second coil spring 142 is an example of the “biasing member” according to the present invention. The coil spring long region 1421 is an example embodiment that corresponds to the “coil spring long region” according to the present invention. The bearing 135a is an example embodiment that corresponds to the “bearing” according to the present invention. The clamp member 131 is an example embodiment that corresponds to the “clamp member” according to the present invention. The color member 135 is an example of the “color member” according to the present invention. The hole 1352 is an example of the “hole” according to the present invention. The inner region 1351 is an example of the “inner region” according to the present invention. The outer region 1353 is an example of the “outer region” according to the present invention. The color member long region 1354 is an example of the “color member long region” according to the present invention. The bearing arrangement area 1355 is an example of the “bearing arrangement area” according to the present invention. The sliding contact area 130a is an example of the “sliding contact area” according to the present invention. The first inclined element 130b is an example embodiment that corresponds to the “first inclined element” according to the present invention. The second inclined element 130c is an example embodiment that corresponds to the “second inclined element” according to the present invention. The first contact portion 1521a and the second contact portion 1522a are examples of the “contact portion” according to the present invention.

100, 200 Electric vibration tool (work tool)
100a Longitudinal direction 100a1 Front side 100a2 Rear side 100b Height direction 100b1 Upper side 100b2 Lower side 100c Width direction 101 Main body housing 1011 Front side area 1012 Middle area 1013 Rear side area 107 Grip part 108 Slide switch 109 Battery mounting part 110 Inner housing 1101 First inner Housing 1102 Second inner housing 1103 Connecting member 1104 Spatial region 111 Elastic member 115 Drive motor (motor)
117 Output shaft portion 117a Motor rotating shaft direction 120 Drive mechanism 121 Eccentric shaft portion 1211 Eccentric portion 121a Bearing 121b Bearing 122 Drive bearing 123 Driven arm (transmission member)
1231 Arm portion 1232 Fixed portion 124 Spindle 1241 Upper end portion 1242 Lower end portion 124a Spindle rotation axis direction 124b Crossing direction 124c Bearing 124d Bearing 126 Tool holding portion 127 Clamp shaft (tip tool holding member)
1271 Spindle inner region 1272 Engagement region 1273 Fastening region (tip tool fastening region)
128 Clamp head 129 Clamp member engaging groove 130 Lock mechanism 1301 Lock mechanism assembly 130a Sliding contact region 130b First inclined element 130c Second inclined element 131 Clamp member 132 Convex part 1331 First clamp member inclined part 1332 Second clamp member inclined part 1333 Clamp member inclined connection region 1333a First extension region 1333b Second extension region 134 First coil spring 135 Collar member 1351 Inner region 1352 Hole 1353 Outer region 1354 Color member long region 1355 Bearing arrangement region 135a Bearing 1361 First Color member inclined portion 1362 Second color member inclined portion 1363 Color member inclined connecting region 137 Lid member 140 Energizing mechanism 141 Support member 1411 Coil spring support portion 1412 Clamp member support portion 42 second coil spring (biasing member)
1421 Coil spring long region 145 Blade (tip tool)
150 Lock operation mechanism (operation mechanism)
151 Handle part 1511 Grasping part 1512 Arm part 1513 Rotating shaft part (Handle rotating shaft part)
152 switching portion 1521 first cam portion 1521a first contact portion 1521b first notch portion 1522 second cam portion 1522a second contact portion 1522b second notch portion 153 switching connection portion 1531 eccentric shaft portion 180 controller 190 battery

Claims (9)

A working tool that drives a tip tool to perform a predetermined machining operation on a workpiece,
A motor,
A spindle for transmitting the driving force of the motor to the tip tool;
A tip tool holding member configured to be movable in a spindle rotation axis direction between a holding position for holding the tip tool and an open position for releasing the tip tool;
A locking mechanism that engages with the tip tool holding member placed at the holding position to lock the tip tool holding member;
A main body housing constituting at least a part of an outline of the work tool,
The spindle is hollow and has one end and the other end on the spindle rotation axis direction,
The tip tool holding member includes a spindle inner region disposed in the spindle, a tip tool fastening region extending from the one end portion and configured to be fastened to the tip tool, and the other end portion. An engagement region extending from and configured to be engageable with the locking mechanism,
The work mechanism is characterized in that the lock mechanism is disposed between the other end and a wall portion constituting the main body housing in the spindle rotation axis direction. The work tool according to claim 1,
An urging member disposed between the other end and the locking mechanism;
The biasing member biases the tip tool holding member toward the engagement region, whereby the tip tool is clamped between the tip tool fastening region and the spindle, and the tip tool fastening region is The work tool, wherein the tip tool is fastened. The work tool according to claim 1 or 2,
The locking mechanism is
It is configured to be movable between an engagement position that engages with the tip tool holding member to lock the tip tool holding member at the holding position and a release position that releases the engagement of the tip tool holding member. A clamp member;
A collar member for supporting the clamp member,
In the crossing direction which is a direction crossing the spindle rotation axis direction, the collar member constitutes a color member long region formed longer than the length of the spindle. A work tool according to claim 2,
The biasing member is constituted by a coil spring,
A work tool characterized in that an outer diameter of the coil spring constitutes a coil spring long region formed larger than an outer diameter of the spindle. The work tool according to any one of claims 1 to 4,
A transmission member for transmitting the driving force of the motor to the spindle;
The motor is arranged such that the motor rotation axis direction is parallel to the spindle rotation axis direction,
The work tool, wherein the transmission member and the spindle are disposed closer to the tip tool fastening region than the motor. The work tool according to any one of claims 1 to 4,
A transmission member for transmitting the driving force of the motor to the spindle;
The transmission member includes an arm portion that receives the driving force of the motor, and a fixed portion that is fixed to the spindle.
The motor is arranged such that the motor rotation axis direction intersects the spindle rotation axis direction,
The work tool characterized in that the fixed portion and the spindle are disposed closer to the tip tool fastening region than the motor. The work tool according to any one of claims 1 to 6,
The clamp member and the collar member have a sliding contact area in sliding contact with each other,
The sliding contact region has a first inclined element inclined with respect to the spindle rotational axis direction, and a second inclined element inclined with respect to the spindle rotational axis direction,
The work tool, wherein the first tilting element and the second tilting element are arranged so as to be separated from each other in the spindle rotation axis direction. The work tool according to claim 7,
The collar member includes an inner region having a hole portion through which the clamp member is disposed and the engagement region of the tip tool holding member is inserted, and an outer region formed outside the inner region in the intersecting direction. And having an area
The work tool according to claim 1, wherein a bearing arrangement area for arranging a bearing for rotatably supporting the collar member is formed in the outer area. A work tool according to claim 7 or 8,
The collar member is configured to be movable between a maintenance position for maintaining the clamp member in the engagement position and an allowable position for allowing the clamp member to move from the engagement position to the release position. ,
The work tool further includes an operation mechanism configured to move the collar member between the maintenance position and the allowable position by a manual operation by a user.
The operation mechanism includes a contact portion that moves the collar member from the allowable position to the maintenance position.

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