POWER TOOL WITH INNER HOUSING

Abstract

A power tool (100; 200) that performs a predetermined operation on a workpiece by driving a tool accessory (145), comprising a body casing (101), an engine (115), a spindle (124) which transmits a driving force of the motor (115) to the tool accessory (145), a tool accessory holding member (127) configured to be movable in a spindle rotation axis direction between a holding position for holding the tool accessory (145) and a release position for releasing the tool accessory (145), a locking mechanism (130) configured to be movable between an engagement position for locking the tool accessory holding member (127) in the holding position and an unlocking position for releasing the locking of the tool accessory holding member (127), an inner housing (110) received in the body housing (101) and accommodating at least a portion of the locking mechanism (130), and an actuating mechanism (150) for actuating the locking mechanism (130), in which the actuating mechanism (150) a handle (151) arranged on an outer side of the body casing (101) to be operated by a user, a switching element (152) connected to the handle (151) and switching the locking mechanism (130) between the engagement position and the unlocking position according to the operation of the handle (151), and a switching connection element (153) connected to the switching element (152), wherein the switching connection element (153) is separated from the inner housing (110) when the locking mechanism (130) is placed in the engaged position by the switching element (152) and comes into contact with the inner housing (110) when the locking mechanism (130) is placed in the unlocked position by the switching element (152).

Description

TECHNICAL FIELD

[0001] The present invention relates to a power tool that performs a predetermined operation on a workpiece by driving a tool accessory. STATE OF THE ART

[0002] EP 1 737 616 A1 discloses a handheld power tool that transmits a drive force from a drive motor to a spindle for driving a tool accessory. In this power tool, a clamping shaft extends through the spindle and holds the tool accessory. The clamping shaft is configured to be movable between a holding position for holding the tool accessory and a release position for releasing the tool accessory, and to engage, in the holding position, a locking mechanism provided inside the spindle.

[0003] Furthermore, DE 41 22 320 A1 discloses a tool fastening for power tools and DE 10 2007 035 045 A1 discloses a power-driven hand tool. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In the power tool described in EP 1 737 616 A1, the clamping shaft is locked by the locking mechanism and holds the tool accessory, allowing a user to stably perform a predetermined work operation. Furthermore, the user can easily replace the tool accessory by placing the clamping shaft in the release position.

[0005] However, in this power tool, the spindle is mounted on a body housing, which forms an outer shell of the power tool, so that vibration is easily transmitted to the body housing.

[0006] Accordingly, an object of the present invention is to provide a more rational technique for reducing the transmission of vibration to a body casing.

[0007] To achieve the above-described object, the present invention provides a power tool that performs a predetermined operation on a workpiece by driving a tool accessory. The power tool includes a body casing, a motor, and a spindle that transmits the driving force of the motor to the tool accessory. The spindle may have a hollow shape.

[0008] The power tool further includes a tool accessory holding member configured to be movable in a spindle rotation axis direction between a holding position for holding the tool accessory and a release position for releasing the tool accessory, and a locking mechanism configured to be movable between an engagement position for locking the tool accessory holding member in the holding position and an unlocking position for releasing the locking of the tool accessory holding member. The tool accessory holding member may be arranged in an inner region of the spindle.

[0009] The power tool further includes an inner housing received within the body housing and accommodating at least a portion of the locking mechanism, and an actuating mechanism for actuating the locking mechanism. The manner in which the inner housing "accommodates at least a portion of the locking mechanism" represents that the locking mechanism is entirely covered by the inner housing, or that the locking mechanism has a portion covered by the inner housing and a portion exposed by the inner housing. In this sense, the inner housing may accommodate at least a portion of the spindle and the tool accessory retaining member.

[0010] The operating mechanism includes a handle portion disposed on the exterior of the body casing to be operated by a user, a switching portion connected to the handle portion and switching the locking mechanism between the engaged position and the unlocked position according to the operation of the handle portion, and a switching connection portion connected to the switching portion. The switching connection portion is separated from the inner casing when the locking mechanism is placed in the engaged position by the switching portion, and comes into contact with the inner casing when the locking mechanism is placed in the unlocked position by the switching portion.

[0011] With the structure described above, in the power tool according to the present invention, the switch connection part is separated from the inner casing during operation by a user, so that transmission of vibration to the body casing via the switch connection part can be reduced.

[0012] In the power tool of the present invention, the spindle is normally rotationally driven by the motor so as to reciprocally drive the tool accessory within a predetermined angular range about the spindle rotation axis. Specifically, the tool accessory is driven to reciprocally rotate about the spindle rotation axis. The tool accessory suitably includes a plurality of tools, such as a cutting tool for cutting a workpiece and a grinding tool for grinding a workpiece. Thus, the tool accessory performs a cutting or grinding operation by reciprocally driving (vibrating) the tool accessory within a predetermined angular range. The power tool is also referred to as a vibration tool.

[0013] According to another aspect of the power tool of the present invention, the power tool may include a biasing member disposed between the spindle and the locking mechanism, which biases the locking mechanism to hold the locking mechanism in the engaged position. With this structure, when the locking mechanism is placed in the unlocked position by the switching part, the switching connection part is biased by the biasing member to come into contact with the inner housing.

[0014] In the power tool according to this aspect, the inner housing absorbs the biasing force of the biasing member when the locking mechanism is placed in the unlocking position. Therefore, the body housing can be formed of a lightweight material such as synthetic resin, and the inner housing is preferably formed of metal so that it can withstand the biasing force of the biasing member.

[0015] According to another aspect of the power tool of the present invention, the switching portion may include a first cam and a second cam configured to rotate upon actuation of the handle. The locking mechanism may include a collar member configured to be movable and a clamp member configured to move between the engaged position and the unlocked position by moving relative to the collar member.

[0016] The first cam is configured to contact a predetermined portion of the collar member, and the second cam is configured to contact a portion of the collar member spaced apart from the predetermined portion. With this structure, when the collar member is moved by rotating the first and second cams, the clamping member can be moved between the engaged position and the unlocked position.

[0017] In the power tool according to this aspect, the first and second cams come into contact with the portions of the collar member that are spaced apart from each other, so that the movement of the collar member can be stabilized.

[0018] Furthermore, if the first and second cams are configured to contact predetermined regions of the collar member that are opposite to each other with respect to the spindle rotation axis, the movement of the collar member can be further stabilized. In this case, it is particularly preferred that the first and second cams be arranged in point symmetry with respect to the spindle rotation axis.

[0019] Furthermore, typically, the clamp member and the collar member may have a sliding contact portion so that they slide in contact with each other. The sliding contact portion may include a first inclined member inclined with respect to the spindle rotation axis direction and a second inclined member inclined with respect to the spindle rotation axis direction. With this structure, the first inclined member and the second inclined member may be spaced apart from each other in the spindle rotation axis direction. The clamp member may be allowed to move between the engaged position and the unlocked position by sliding contact of the clamp member and the collar member with each other.

[0020] According to another aspect of the power tool of the present invention, the switching connecting part may be formed by an eccentric shaft connecting the first cam and the second cam.

[0021] In the power tool according to this aspect, the eccentric shaft is rotated in conjunction with the rotation of the first and second cams. When the locking mechanism is placed in the engaged position by the first and second cams, the eccentric shaft can be separated from the inner housing, and when the locking mechanism is placed in the unlocked position by the first and second cams, the eccentric shaft can come into contact with the inner housing.

[0022] According to another aspect of the power tool of the present invention, the handle portion may include a handle rotating shaft disposed within the body housing. In this structure, the switching portion and the switching connection portion may be formed on the handle rotating shaft.

[0023] In the power tool according to this aspect, the handle rotating shaft can also serve as the switching part and the switching connecting part, so that the operating mechanism can have a compact structure.

[0024] According to another aspect of the power tool of the present invention, the inner housing may include a first inner housing, a second inner housing connected to the first inner housing, and an inner housing spacing portion formed by disposing the first inner housing and the second inner housing with a predetermined spacing therebetween. With this structure, at least a part of the locking mechanism may be housed in the first inner housing, and a part of the switching connection part may be disposed in the inner housing spacing portion.

[0025] In the power tool according to this aspect, the switching connection part can come into contact with the second inner housing when the locking mechanism is placed in the unlocking position by the switching part. Furthermore, the inner housing having the inner housing clearance portion can be formed by the first inner housing and the second inner housing, so that the inner housing can be easily manufactured.

[0026] According to another aspect of the power tool of the present invention, the body housing and the inner housing are connected to each other via an elastic member.

[0027] In the power tool according to this aspect, vibration generated in the inner casing and transmitted to the body casing can be reduced.

[0028] According to the present invention, a more rational technique for reducing transmission of vibration to a body casing can be provided. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the external appearance of an electric vibration tool according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing an internal structure of the vibrating tool. Fig. 3 is an enlarged cross-sectional view showing an essential part of the vibrating tool. Fig. 4 is an enlarged cross-sectional view showing a locking mechanism of the vibrating tool. Fig. 5 is a cross-sectional view showing the vibrating tool viewed from the front. Fig. 6 is an external view showing the replacement process of a tool accessory. Fig. 7 is an enlarged cross-sectional view illustrating the operation of a locking mechanism for exchanging the tool accessories. Fig. 8 is a cross-sectional view illustrating an operation of a lock operating mechanism for exchanging the tool accessory. Fig. 9 is a cross-sectional view showing an internal structure of an electric vibration tool according to a second embodiment of the present invention. Fig. 10 is an enlarged cross-sectional view showing an essential part of the vibrating tool. REPRESENTATIVE EMBODIMENT OF THE INVENTION

[0029] Representative embodiments of a power tool according to the present invention will now be described with reference to Fig. 1 to 10 described. Fig. 1 to 8 show a power tool according to a first embodiment, and FIGS. 9 and 10 show a power tool according to a second embodiment.

[0030] Parts and mechanisms of the power tool of the second embodiment that are identical or similar to those of the first embodiment are given the same names and reference numerals as in the first embodiment and will not be described here. (First embodiment)

[0031] The first embodiment of the present invention will now be described with reference to Fig. 1 to 8. In the first embodiment, an electric vibration tool 100 is described as a representative example of the power tool according to the present invention. As shown in Fig. 1, the electric vibration tool 100 has a tool accessory selected from a plurality of tool types, such as a cutting edge and a polishing wheel, attached thereto, and performs a working operation, such as a cutting operation and a polishing operation, on a workpiece according to the selected tool accessory by vibrating the attached tool accessory. In Fig. 1, a cutting edge 145 is attached as a representative example of the tool accessories.

[0032] Fig. 1 to 5 show the state in which the cutting edge 145 is attached to the vibrating tool 100, and Fig. 6 to 8 show the state in which the cutting edge 145 is removed from the vibrating tool 100. (Contour of the electric vibration tool)

[0033] As in Fig. As shown in FIG. 1, the electric vibration tool 100 includes a resin body casing forming an outer shell of the vibration tool 100. The body casing 101 is an exemplary embodiment corresponding to the "body casing" according to the present invention. The cutting edge 145 is removably attached to a front end portion of the body casing 101 in the extending direction of the body casing 101, and a battery mounting part 109, to which a battery 190 is removably mounted, is provided at the other end portion of the body casing 101. The battery 190 is configured to be removable from the battery mounting part 109.

[0034] As in Fig. 1, the body casing 101 forms a grip part 107 to be held by a user. The grip part 107 is formed to extend in an elongated shape in an intermediate region 1012 between a front region 1011 and a rear region 1013 of the body casing 101. The battery 190 is attached to and removed from the battery mounting part 109 by sliding in a direction that crosses the extending direction of the grip part 107. A slide switch 108 is provided at a position where a user's thumb is assumed to be placed when a user holds the grip part 107. The slide switch 108 and the battery mounting part 109 are connected to a controller 180 (see Fig. 2) are electrically connected. Therefore, by operating the slide switch 108, a drive motor 115 (see Fig. 2) On and off. When the slide switch 108 is turned on, the user can select a first mode for driving the drive motor 115 at a predetermined speed or a second mode for driving the drive motor 115 at a higher speed than the speed of the first mode. The controller 180 controls the drive motor 115 according to the operation of the slide switch 108.

[0035] As in Fig. 2, the electric vibration tool 100 comprises a drive mechanism 120 for driving the cutting edge 145 and a locking mechanism 130 for removably attaching the cutting edge 145 to the body housing 101. The locking mechanism 130 is actuated by a locking actuating mechanism 150, which is shown in Fig. 1. The locking actuating mechanism 150 is an exemplary embodiment corresponding to the "actuating mechanism" according to the present invention. As shown in Fig. 1, the lock actuating mechanism 150 includes a handle portion 151 disposed on an outer side of the front portion 1011, and a rotating shaft 1513 connected to the handle portion 151 at the front portion 1011 and disposed inside the body case 101. The handle portion 151 includes a handle 1511 to be held by a user and a pair of arms 1512 extending from the handle 1511. The rotating shaft 1513 extends between the arms 1512 and is connected to the arms 1512. The handle portion 151 and the rotating shaft 1513 are exemplary embodiments corresponding to the "handle" and "handle rotating shaft," respectively, according to the present invention.

[0036] Fig. 1 shows the handle part 151 in a cutting locking position and Fig. 6 shows the handle portion 151 in a blade replacement position. When the handle portion 151 is placed in the blade locking position, the locking mechanism 130 locks the blade 145 to the vibratory tool 100. When the handle portion 151 is placed in the blade replacement position, the locking mechanism 130 releases the locking of the blade 145, allowing the blade 145 to be removed from or attached to the vibratory tool 100.

[0037] Fig. 2 is a cross-sectional view of the vibratory tool 100. The body casing 101 accommodates an inner casing 110. The inner casing 110 includes a first inner casing 1101 and a second inner casing 1102. The first inner casing 1101 and the second inner casing 1102 are formed of metal and connected to each other by connecting members 1103 such as screws. A prescribed clearance portion 1104 is provided between the first inner casing 1101 and the second inner casing 1102. The inner casing 110, the first inner casing 1101, the second inner casing 1102, and the clearance portion 1104 are exemplary embodiments corresponding to the "inner casing," the "first inner casing," the "second inner casing," and the "inner casing clearance portion," respectively, according to the present invention.

[0038] The inner housing 110 is connected to the body housing 101 via a plurality of elastic members 111. The elastic members 111 can reduce vibration generated in the inner housing 110 and transmitted to the body housing 101. The elastic member 111 is an exemplary embodiment corresponding to the "elastic member" according to the present invention.

[0039] As in Fig. 2, the first inner housing 1101 accommodates the drive mechanism 120 and the locking mechanism 130. The locking mechanism 130 is an exemplary embodiment corresponding to the "locking mechanism" according to the present invention. Furthermore, as shown in Fig. 5, the rotary shaft 1513 of the locking actuating mechanism 150 extends through the clearance portion 1104.

[0040] As in Fig. As shown in Figure 2, the drive mechanism 120 includes a rotatable spindle 124. A spindle rotational axis direction 124a defines a crossing direction 124b that crosses the spindle rotational axis direction 124a. The spindle 124 and the spindle rotational axis direction 124a are exemplary embodiments corresponding to the "spindle" and the "spindle rotational axis direction," respectively, according to the present invention.

[0041] Furthermore, in the electric vibration tool 100, the extension direction of the handle part 107 defines a longitudinal direction 100a. In a vibration tool crossing direction that crosses the longitudinal direction 100a, a direction parallel to the spindle rotation axis direction 124a defines a height direction 100b. Furthermore, in the vibration tool crossing direction, a direction that crosses both the height direction 100b and the longitudinal direction 100a defines a width direction 100c. The longitudinal direction 100a defines a front side 100a1 on which the cutting edge 145 is arranged, and a rear side 100a2 opposite the front side 100a1. The height direction 100b defines a lower side 100b2 on which the cutting edge 145 is arranged, and an upper side 100b1 opposite the lower side 100b2. (drive mechanism)

[0042] As in Fig. 2 or Fig. 3, the drive mechanism 120 is configured as a mechanism for driving the cutting edge 145. The drive mechanism 120 mainly includes the drive motor 115, an eccentric shaft 121, a drive bearing 122, a driven arm 123, the spindle 124, and a clamp shaft 127. The drive motor 115 and the clamp shaft 127 are exemplary embodiments corresponding to the "motor" and the "tool accessory holding component" according to the present invention, respectively.

[0043] As in Fig. As shown in Figure 3, the drive motor 115 is configured as a brushless motor. The drive motor 115 is arranged such that an output shaft 117 extends in the height direction 100b. Specifically, the drive motor 115 is arranged in the inner housing 110 such that a motor rotation axis direction 117a is parallel to the spindle rotation axis direction 124a.

[0044] The eccentric shaft 121 is mounted on one end of the output shaft 117 of the drive motor 115 and has an eccentric part 1211 eccentric 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, 121b are held by the first inner housing 1101. The drive bearing 122 is fitted onto the outer periphery of the eccentric part 1211. The drive bearing 122 is arranged between the bearings 121a, 121b in the height direction 100b.

[0045] As in Fig. 3, the driven arm 123 is provided to extend in the longitudinal direction 100a and connect the drive bearing 122 to the spindle 124. A pair of arm parts 1231 are formed in a portion of the driven arm 123 on the rear side 100a2. The arm parts 1231 are arranged in the width direction 100c in contact with the outer periphery of the drive bearing 122. A fixed part 1232 is formed in a portion of the driven arm 123 on the front side 100a1. The fixed part 1232 is configured to surround a specific portion of the spindle 124 and is fixed to the spindle 124.

[0046] The driven arm 123 and the spindle 124 are arranged on the lower side 100b2 of the drive motor 115. With this structure, the drive mechanism 120 can be shortened in the spindle rotation axis direction 124a.

[0047] Furthermore, with this structure, the cutting edge 145 can be positioned closer to the driven arm 123 for driving the spindle 124 in the spindle rotation axis direction 124a. Therefore, the moment generated according to the distance between the driven arm 123 and the cutting edge 145 can be reduced. Thus, vibration generated by machining the workpiece with the cutting edge 145 can be reduced.

[0048] As in Fig. As shown in Figure 3, the spindle 124 is an elongated member having a generally cylindrical hollow shape. The spindle 124 has a flange-like tool-holding portion 126 on the lower side 100b2 for holding the cutting edge 145 in cooperation with the clamping shaft 127. The spindle 124 is rotatably supported by a bearing 124c on the upper side 100b1 and by a bearing 124d on the lower side 100b2. The bearings 124c, 124d are held by the inner housing 110.

[0049] As in Fig. 3, the clamping shaft 127 comprises a generally cylindrical member that can be inserted into the spindle 124. The clamping shaft 127 includes a spindle inner portion 1271 disposed inside the spindle 124, a mounting portion 1273 projecting from a lower end 1242 of the spindle, and an engagement portion 1272 projecting from an upper end 1241 of the spindle 124 when the clamping shaft 127 is inserted into the spindle 124.

[0050] As in Fig. 3, a flange-like clamp head 128 is integrally formed in the mounting portion 1273, and a clamp member engagement groove 129 is formed in the engagement portion 1272. When the clamp shaft is inserted into the spindle 124 and held by the locking mechanism 130, the cutting edge 145 is held between the clamp head 128, the clamp shaft 127, and the tool holding portion 126 of the spindle 124.

[0051] When the drive motor 115 is driven and the output shaft 117 is rotated, a center of the eccentric part 1211 rotates around the motor rotation axis 117a. Thus, the drive bearing 122 reciprocates in the width direction, and the driven arm 123 is driven to reciprocally rotate around the rotation axis of the spindle 124. Consequently, the cutting edge 145 held between the spindle 124 and the clamp shaft 127 is driven to reciprocally rotate, so that a predetermined operation, such as a cutting operation, can be performed. (Locking mechanism and pre-tensioning mechanism)

[0052] The locking mechanism 130 and a biasing mechanism 140 will now be described with reference to Fig. 3 to 5. Fig. 4 is an enlarged cross-sectional view showing the locking mechanism 130, and Fig. 5 is a front cross-sectional view showing the locking mechanism 130 and the biasing mechanism 140. The locking mechanism 130 serves to hold the clamping shaft 127, and the biasing mechanism 140 serves to bias the clamping shaft 127 in a direction from the lower side 100b2 to the upper side 100b1. The locking mechanism 130 and the biasing mechanism 140 are arranged in the first inner housing 1101, which has a cylindrical shape.

[0053] As in Fig. As shown in Figure 4, the locking mechanism 130 mainly includes a clamping member 131, a collar member 135, a first coil spring 134, a cover member 137, and a bearing 135a. These components of the locking mechanism 130 form a locking mechanism assembly 1301. The clamping member 131 and the collar member 135 are exemplary embodiments corresponding to the "clamping member" and "collar member" according to the present invention, respectively.

[0054] As in Fig. 3, the biasing mechanism 140 mainly includes a support member 141 and a second coil spring 142. The second coil spring 142 is an exemplary embodiment corresponding to the “biasing member” according to the present invention.

[0055] The structure of the preloading mechanism 140 will now be described with reference to Fig. 3 and Fig. 5. The support member 141 has a generally cylindrical hollow shape through which the engaging portion 1272 of the clamping shaft 127 is inserted. The support member 141 is rotatably supported by the bearing 124c. The bearing 124c is configured to support both the spindle 124 and the support member 141. With this structure, the number of bearings can be reduced and the vibratory tool 100 can be shortened in the spindle rotation axis direction 124a.

[0056] The support member 141 includes a flange-like coil spring support portion 1411 formed on the lower side 100b2 so as to be held in contact with a lower end of the coil spring 142, and a clamp member support portion 1412 formed on the upper side 100b1 for supporting the clamp member 131. Furthermore, the clamp member support portion 1412 supports the clamp member 131 when the clamp member 131 is placed in a position (unlock position) for replacing the cutting edge 145, which will be described later.

[0057] The second coil spring 142 has an elongated portion 1421 having a larger outer diameter than the spindle 124. In the second coil spring 142 having the elongated portion 1421, the bearing member 141 may be disposed in the inner portion of the second coil spring 142.

[0058] The end of the second coil spring 142 on the lower side 100b2 is held in contact with the support member 141, as described above, and the other end on the upper side 100b1 is held in contact with the collar member 135. Thus, the second coil spring 142 is arranged between the upper end 1241 of the spindle 124 and the locking mechanism 130.

[0059] The structure of the locking mechanism 130 will now be described with reference to Fig. 4. The locking mechanism 130 is arranged between one end of the support member 141 on the upper side 100b1 and the body housing 101 in the spindle rotation axis direction 124a. In other words, the locking mechanism 130 is arranged between the upper end 1241 of the spindle 124 and a wall of the body housing 101. The locking mechanism 130 and the spindle 124 are configured independently of each other and arranged spaced apart from each other, so that the locking mechanism 130 can be constructed independently of the construction of the spindle 124.

[0060] Furthermore, the locking mechanism 130 forming the locking mechanism assembly 1301 can be fully assembled, and only the locking mechanism assembly 1301 can be removed for repair.

[0061] As in Fig. 4, the clamping member 131 consists of a pair of members that hold the engagement portion 1272 of the clamping shaft 127 in a radial direction of the clamping shaft 127. Each clamping member 131 is configured to be movable in the crossing direction 124b. A plurality of ridge portions 132 are formed on an inner surface of the clamping member 131 opposite to the clamping shaft 127 and can engage with the clamping member engagement groove 129 of the clamping shaft 127. The clamping member 131 further includes a first inclined portion 1331 and a second inclined portion 1332, which are inclined with respect to the spindle rotation axis direction 124a.The inclined surfaces of the first and second inclined parts of the clamping member 1331, 1332 are straight, and an angle of an extension line of the inclined surface of the first inclined part of the clamping member 1331 with respect to the spindle rotation axis direction 124a is the same as an angle of an extension line of the inclined surface of the second inclined part of the clamping member 1332 with respect to the spindle rotation axis direction 124a.

[0062] Furthermore, a clamping member inclination connecting part 1333 is formed between the first and second inclined parts of the clamping members 1331, 1332. The clamping member inclination connecting part 1333 includes a first extension portion 1333a extending inward in the crossing direction 124b from one end of the first inclined part of the clamping member 1331 on the lower side 100b2, and a second extension portion 1333b extending in the spindle rotation axis direction 124a from an inner end of the first extension portion 1333a to one end of the second inclined part of the clamping member 1332 on the upper side 100b1. By providing the clamping member inclination connecting part 1333, the first and second inclined parts of the clamping member 1331, 1332 can be formed spaced apart from each other in the spindle rotation axis direction 124a.Furthermore, in the crossing direction 124b, the end of the first inclined part of the clamping member 1331 on the lower side 100b2 can be arranged adjacent to the end of the second inclined part of the clamping member 1332 on the upper side 100b1 by means of the first extension region 1333a. Thus, the first and second inclined parts of the clamping members 1331, 1332 can be shortened in the crossing direction 124b.

[0063] As in Fig. As shown in Figure 4, the first coil spring 134 is disposed between each of the clamping members 131 and the cover member 137. The first coil spring 134 biases the clamping member 131 toward the lower side 100b2 to stabilize the position of the clamping member 131.

[0064] As in Fig. As shown in Figure 4, the collar member 135 serves to control the clamping of the clamping shaft 127 by the clamping members 131. The collar member 135 has an inner portion 1351 having a hole 352 in which the clamping members 131 are arranged and through which the engaging portion 1272 of the clamping shaft 127 is inserted, and an outer portion 1352 formed on the outside of the inner portion 1351 in the crossing direction 124b. The cover member 137 is arranged to cover the inner portion 1351.

[0065] The collar member 135 has an elongated collar member portion 1354 that is longer than the spindle 124 in the crossing direction 124b. By providing the elongated collar member portion 1354, the collar member 135 can receive the end of the second coil spring 142 on the lower side 100b1.

[0066] The outer portion 1353 of the collar member 135 has a bearing arrangement portion 1355 in which the bearing 135a for rotatably supporting the collar member 135 is disposed. By providing the bearing arrangement portion 1355, it becomes unnecessary to provide an arrangement portion for the bearing 135a in a portion of the collar member 135 in the spindle rotation axis direction 124a. Therefore, the collar member 135 can be shortened in the spindle rotation axis direction 124a.

[0067] The bearing arrangement portion 1355 is formed like a groove in the outer periphery of the collar member 135 so that the bearing 135a can be compactly arranged on the collar member 135.

[0068] The outer periphery of the bearing 135a is slidably disposed in the inner housing 110. With this structure, the locking mechanism assembly 1301 is allowed to move in the spindle rotation axis direction 124a. Furthermore, a clearance is formed between the outer portion 1353, which does not include the bearing 135a, and the inner housing 110. Specifically, in the locking mechanism assembly 1301, the bearing 135a forms a contact element with respect to the inner housing 110, and the outer portion 1353 forms a non-contact element with respect to the inner housing 110. With this structure, abnormal noise generated when the locking mechanism assembly 1301 is rotated can be reduced.

[0069] The collar member 135, the clamping members 131, and the bearing 135a are arranged along the intersection direction 124b. With this structure, the locking mechanism 130 can be shortened in the spindle rotation axis direction 124a.

[0070] As in Fig. As shown in Figure 4, the collar member 135 includes a first inclined portion of the collar member 1361 and a second inclined portion of the collar member 1362, which are inclined with respect to the spindle rotation axis direction 124a. The inclined surfaces of the first and second inclined portions of the collar members 1361, 1362 are straight, and an angle of an extension line of the inclined surface of the first inclined portion of the collar member 1361 with respect to the spindle rotation axis direction 124a is the same as the angle of an extension line of the inclined surface of the second inclined portion of the collar member 1362 with respect to the spindle rotation axis direction 124a.

[0071] Furthermore, a collar member inclination connecting part 1363 is formed between the first and second inclined parts of the collar members 1361, 1362. The extension direction of the collar member inclination connecting part 1363 is parallel to the spindle rotation axis direction 124a. With this structure, the first and second inclined parts of the collar members 1361, 1362 can be arranged spaced apart from each other in the spindle rotation axis direction 124a. Furthermore, one end of the first inclined part of the collar member 1361 on the lower side 100b2 and one end of the second inclined part 1362 of the collar member 1362 on the upper side 100b1 are arranged on a line extending in the spindle rotation axis direction 124a. Thus, the first and second inclined parts of the collar member 1361, 1362 can be shortened in the crossing direction 124b.

[0072] The first inclined part of the collar member 1361 and the second inclined part of the collar member 1362 are configured to slide into contact with the first inclined part of the clamping member 1331 and the second inclined part of the clamping member 1332, respectively. Specifically, the collar member 1361 and the clamping member 1331 form a sliding contact area 130a. In the sliding contact area 130a, the first inclined part of the collar member 1361 and the first inclined part of the clamping member 1331 form a first inclined element 130b, and the second inclined part of the collar member 1362 and the second inclined part of the clamping member 1332 form a second inclined element 130c.

[0073] As in Fig. As shown in Fig. 4, the collar member 135 is biased by the second coil spring 142, and the clamp member 131 is biased by the first coil spring 134, so that the first inclined portion of the collar member 1361 comes into contact with the first inclined portion of the clamp member 1331, and the second inclined portion of the collar member 1362 comes into contact with the second inclined portion of the clamp member 1332. Thus, the clamp member 131 is moved inward in the radial direction of the clamp shaft 127. Accordingly, the two clamp members 131 hold the clamp shaft 127 by engaging the ridge portions 132 of the clamp member 131 with the clamp member engagement groove 129 of the clamp shaft 127. The clamping shaft 127 is held by the clamping members 131 and biased toward the upper side 100b1 by the second coil spring 142. In this way, the cutting edge 145 is held between the clamping head 128 of the clamping shaft 127 and the tool holding part 126 of the spindle 124.

[0074] In this state, the position of the clamping shaft 127 defines a holding position for holding the cutting edge 145, the position of the clamping member 131 defines an engagement position for engagement with the clamping shaft 127, and the position of the collar member 135 defines a retention position for maintaining the clamping member 131 in the engagement position. When the cutting edge 145 is removed from the vibrating tool 100, which will be described below with reference to Fig. 6 to 8, the collar member 135 moves to an enabling position so as to allow the clamping member 131 to move to an unlocking position, the clamping member 131 moves to the unlocking position for unlocking the clamping shaft 127, and the clamping shaft 127 moves to a releasing position for releasing the cutting edge 145. (locking actuation mechanism)

[0075] The locking actuating mechanism 150 is configured to actuate the locking mechanism 130. Specifically, the locking actuating 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 clamping member 131 is switched between the engaged position and the unlocked position with respect to the clamping shaft 127.

[0076] Fig. 1 to 5 show the state in which the clamping member 131 is placed in the engaging position by the locking operating mechanism 150, and Fig. 6 to 8 show the state in which the clamping member 131 is allowed to move to the unlocking position by the locking operating mechanism 150.

[0077] As in Fig. As shown in Fig. 5, the rotary shaft 1513 connected to the handle part 151 is arranged to extend through the body case 101 in the width direction 110c so as to be located in the clearance region 1104 formed between the first inner case 1001 and the second inner case 1102. A switching part 152 is provided at both ends of the rotary shaft 1513 and is configured to come into contact with the collar member 135. The switching part 152 includes a first cam 1521 and a second cam 1522. The first cam 1521 has a first contact part 1521a that can come into contact with the collar member 135 and a first notch part 1521b that can be separated from the collar member 135. The second cam 1522 has a second contact part 1522a that can come into contact with the collar member 135 and a second notch part 1522b that can be separated from the collar member 135.The switching part 152, the first cam 1521 and the second cam 1522 are exemplary embodiments corresponding to the “switching element”, the “first cam” and the “second cam” according to the present invention, respectively.

[0078] A switching link part 153 is provided between the first cam 1521 and the second cam 1522 on the rotating shaft 1513. An eccentric shaft 1531 forms the switching link part 153 and has a rotation axis eccentric to the rotation axis of the rotating shaft 1513. Specifically, the rotating shaft 1513 is formed with the switching part 152 and the switching link part 153. Thus, the switching part 152 and the switching link part 153 rotate with each other in conjunction with the rotational operation of the handle part 151. The switching link part 153 and the eccentric shaft 1531 are exemplary embodiments corresponding to the "switch link member" and the "eccentric shaft" according to the present invention.

[0079] When the handle part 151 is in the cutting lock position as shown in Fig. 1, the first notch part 1521b and the second notch part 1522b of the switching part 152 (the first cam 1521 and the second cam 1522) are located on the upper side 100b1 of the collar member 135, as shown in Fig. 5. Therefore, the switching part 152 releases the collar member 135. At this time, the collar member 135 is biased toward the upper side 100b1 by the second coil spring 142, and the first inclined part 1361 of the collar member and the second inclined part 1362 of the collar member come into contact with the first inclined part of the clamping member 1331 and the second inclined part of the clamping member 1332, respectively. As a result, the two clamping members 131 are moved toward the clamping shaft 127 and hold the clamping shaft 127. Furthermore, the switching connection part 153 (the eccentric shaft 1531) is placed spaced apart from the second inner housing 1102. Thus, transmission of vibration to the second inner housing 1102 by means of the switching connection part 153 can be reduced.

[0080] In this state, as in Fig. 4, the clamp shaft support portion 1412 of the support member 1441 is held in non-contact with the clamp member 131.

[0081] As described above, in this state, the position of the clamp shaft 127 defines a holding position for holding the cutting edge 145, the position of the clamp member 131 defines an engaging position for engaging with the clamp shaft 127, and the position of the collar member 135 defines a maintaining position for maintaining the clamp member 131 in the engaging position.

[0082] When the handle part 151 is in the cutter replacement position as shown in Fig. 6, the first contact part 1521a and the second contact part 1522a of the switching part 152 come into contact with the collar component 135, as shown in Fig. 8, and move the collar member 135 to the lower side 100b2 against the biasing force of the second coil spring 142. Accordingly, as shown in Fig. 7, the clamp member supporting part 1412 of the supporting part 141 comes into contact with the clamp members 131 and moves the clamp members 131 to the upper side 100b1 with respect to the collar member 135.

[0083] Furthermore, regions of the collar member 135 that come into contact with the first and second contact parts 1521a, 1522a are located in point symmetry with respect to the spindle rotation axis 124a. Thus, the first and second contact parts 1521a, 1522a come into contact with the regions of the collar member 135 that are spaced apart from each other in the crossing direction 124b, so that the movement of the collar member 135 can be stabilized.

[0084] When the clamping members 131 are moved toward the upper side 100b1 with respect to the collar member 135, the first inclined portion of the clamping member 1331 and the second inclined portion of the clamping member 1332 are disengaged from the first inclined portion of the collar member 1361 and the second inclined portion of the collar member 1362, respectively, allowing the clamping members 131 to move in a direction away from the clamping shaft 127 in the intersection direction 124b. Specifically, the clamping force of the clamping shaft 127 with the clamping members 131 is reduced. In this state, the clamping shaft 127 can be moved downward from the spindle 124 by pulling out the clamping shaft 127. The cutting edge 145 is thus released by releasing the clamping shaft 127. Thus, the cutting edge 145 can be replaced as a tool accessory.

[0085] In this state, the position of the collar member 135 defines an enabling position for allowing the clamp member 131 to move to the unlocking position, the position of the clamp member 131 defines the unlocking position for unlocking from the clamp shaft 127, and the position of the clamp shaft 127 defines the releasing position for releasing the cutting edge 145.

[0086] Furthermore, as in Fig. As shown in Figure 8, the switching connection part 153 is arranged in contact with the second inner housing 1102. Therefore, the second inner housing 1102 receives the biasing force of the second coil spring 142 via the locking mechanism 130, the switching part 152, and the switching connection part 153. Specifically, the body housing 101 does not receive the biasing force of the second coil spring 142, so the body housing 101 can be formed of synthetic resin to reduce the weight of the vibrating tool 100.

[0087] As described above, the cutting edge 145 can be moved by moving the handle part 151 from the cutting edge locking position shown in Fig. 1, to the cutting blade replacement position shown in Fig. 6. On the other hand, when the clamping shaft 127 is inserted into the spindle 124 with the cutting edge 145 mounted thereon and the handle portion 151 is moved from the cutting edge replacement position to the cutting edge locking position, the cutting edge 145 can be held between the clamping shaft 127 and the spindle 124. (Second embodiment)

[0088] An electric vibration tool 200 according to the second embodiment of the present teachings will now be described with reference to Fig. 9 and Fig. 10. The vibration tool 200 of the second embodiment differs from the vibration tool 100 of the first embodiment in the arrangement of the drive motor 115. As shown in Fig. 9, the drive motor 115 is arranged in the inner housing 110 such that the motor rotation axis direction 117a extends in a direction that crosses the spindle rotation axis direction 124a.

[0089] With this arrangement of the drive motor 115, as in Fig. As shown in Figure 10, a portion of the driven arm 123 between the arm portions 1231 and the fixed portion 1232 is curved. The arm portions 1231 extend from the lower side 100b2 to the upper side 100b1 and are configured to support the drive bearing 122 from the lower side 100b2. By forming the driven arm 123 in a curved shape, a space enclosed by the drive motor 115, the eccentric shaft 121, and the spindle 124 within the body case 101 can be effectively utilized.

[0090] Furthermore, with the configuration of the driven arm 123 extending from the arm parts 1231 to the fixed part 1232 across the curved portion, stress concentrations at the fixed part 1232 can be avoided.

[0091] The electric vibration tool 200 includes the locking mechanism 130 and the locking actuation mechanism 150 provided in the above-described electric vibration tool 100. Therefore, the electric vibration tool 200 can perform the same operations and functions as the electric vibration tool 100.

[0092] In the above-described embodiments, the electric vibration tools 100, 200 were described as representative examples of the power tool, but the power tool is not limited to an electric vibration tool. For example, the present invention can also be applied to a power tool such as a grinder and a circular saw in which the tool attachment rotates. Furthermore, a brushless motor is used as the drive motor 115, but a motor with a brush can also be used.

[0093] Given the nature of the invention described above, the power tool of the present invention may include the following features. Each of the features may be used separately or in conjunction with the others, or in combination with the claimed invention. (Aspect 1)

[0094] A bearing component is arranged between the second end of the spindle and the locking mechanism, the bearing component has a coil spring bearing part formed in a lower region and supporting a preloading component, and a coil spring is arranged between the coil spring bearing part and the locking mechanism. (Aspect 2)

[0095] The support member includes a clamp shaft support portion formed in an upper portion and supporting a clamp member when the clamp member is placed in an unlocking position. (Aspect 3)

[0096] A bearing for supporting the spindle also serves as a bearing for supporting the bearing component. (Aspect 4)

[0097] A locking mechanism assembly is slidably disposed in the spindle rotation axis direction in the inner housing. (Aspect 5)

[0098] In the locking mechanism assembly, the bearing forms a contact element with respect to the inner housing, and the collar member forms a non-contact element with respect to the inner housing. (Correspondences between the features of the embodiment and the features of the invention)

[0099] The above-described embodiment is a representative example for embodying the present invention, and the present invention is not limited to the structures described as the representative embodiment. Correspondences between the features of the embodiment and the features of the invention are as follows: The electric vibration tool 100, 200 is an exemplary embodiment corresponding to the “power tool” according to the present invention. The cutting edge 145 is an exemplary embodiment corresponding to the “tool accessory” according to the present invention. The body casing 101 is an exemplary embodiment corresponding to the “body casing” according to the present invention. The lock operating mechanism 150 is an exemplary embodiment corresponding to the “operating mechanism” according to the present invention. The handle part 151 and the rotating shaft 1513 are exemplary embodiments corresponding to the “handle part” and the “handle rotating shaft” according to the present invention, respectively. The inner casing 110, the first inner casing 1101, the second inner casing 1102, and the spacer portion 1104 are exemplary embodiments corresponding to the “inner casing,” the “first inner casing,” the “second inner casing,” and thecorrespond to the "inner housing clearance range" according to the present invention. The elastic member 111 is an exemplary embodiment corresponding to the "elastic member" of the present invention. The locking mechanism 130 is an exemplary embodiment corresponding to the "locking mechanism" according to the present invention. The spindle 124 and the spindle rotation axis direction 124a are exemplary embodiments corresponding to the "spindle" and the "spindle rotation axis direction" according to the present invention, respectively. The drive motor 115 and the clamp shaft 127 are exemplary embodiments corresponding to the "drive motor" and the "tool accessory holding member" according to the present invention. The clamp member 131 and the collar member 135 are exemplary embodiments corresponding to the "clamp member" and the "collar member" of the present invention, respectively.The second coil spring 142 is an exemplary embodiment corresponding to the "biasing member" according to the present invention. The switching part 152, the first cam 1521, and the second cam 1522 are exemplary embodiments corresponding to the "switching part," the "first cam," and the "second cam," respectively, according to the present invention. The switching connection part 153 and the eccentric shaft 1531 are exemplary embodiments corresponding to the "switching connection part" and the "eccentric shaft," respectively, according to the present invention.

[0100] It is explicitly emphasized that all features disclosed in the description and / or the claims are to be considered separate and independent of each other for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, regardless of the feature combinations in the embodiments and / or the claims. It is explicitly stated that all range specifications or specifications of groups of units disclose every possible intermediate value or subgroup of units for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, in particular also as a limit of a range specification. List of reference symbols 100, 200 electric vibration tool (power tool) 100a Longitudinal direction 100a1 front page 100a2 rear side 100b elevation direction 100b1 upper side 100b2 lower side 100c width direction 101 Body casing 1011 front area 1012 Intermediate area 1013 rear area 107 Handle part 108 slide switches 109 Battery mounting part 110 inner casing 1101 first inner casing 1102 second inner housing 1103 connecting component 1104 Distance range 111 elastic component 115 Drive motor (engine) 117 Issue Wave 117a Motor rotation axis 120 drive mechanism 121 eccentric shaft 1211 eccentric part 121a Warehouse 121b warehouse 122 drive bearings 123 driven arm (transmission component) 1231 armrest 1232 fixed part 124 Spindle 1241 upper end 1242 lower end 124a Spindle rotation axis direction 124b Crossing direction 124c warehouse 124d bearing 126 Tool holder 127 Clamping shaft (tool accessory holding component) 1271 spindle inner area 1272 intervention area 1273 Mounting area (tool accessory mounting area) 128 clamping head 129 Clamping component engagement groove 130 Locking mechanism 1301 Locking mechanism assembly 130a Sliding contact area 130b first inclined element 130c second inclined element 131 clamping component 132 ridge part 1331 first inclined part of the clamping component 1332 second inclined part of the clamping component 1333 Clamping component inclination connection part 1333a first extension area 1333b second extension area 134 first coil spring 135 collar component 1351 inner area 1352 holes 1353 outer area 1354 elongated collar component area 1355 Storage arrangement area 135a Camp 1361 first inclined part of the collar component 1362 second inclined part of the collar component 1363 Collar component inclination connecting part 137 Cover component 140 Pre-tensioning mechanism 141 Bearing component 1411 Coil spring bearing part 1412 Clamping component storage part 142 second coil spring (preload component) 1421 elongated coil spring area 145 Cutting edge (tool accessories) 150 Locking operating mechanism (operating mechanism) 151 Handle part 1511 handle 1512 Arm 1513 Rotating shaft (handle part rotating shaft) 152 Switching part 1521 first cam 1521a first contact part 1521b first notch part 1522 second cam 1522a second contact part 1522b second notch part 153 Switch connection part 1531 eccentric shaft 180 Control 190 Battery

Claims

[1] Power tool (100; 200) that performs a predetermined operation on a workpiece by driving a tool accessory (145), with a body casing (101), an engine (115), a spindle (124) which transmits a driving force of the motor (115) to the tool accessory (145), a tool accessory holding member (127) configured to be movable in a spindle rotation axis direction between a holding position for holding the tool accessory (145) and a release position for releasing the tool accessory (145), a locking mechanism (130) configured to be movable between an engagement position for locking the tool accessory holding member (127) in the holding position and an unlocking position for releasing the locking of the tool accessory holding member (127), an inner housing (110) received in the body housing (101) and accommodating at least a portion of the locking mechanism (130), and an actuating mechanism (150) for actuating the locking mechanism (130), in which the actuating mechanism (150) a handle (151) arranged on an outer side of the body casing (101) to be operated by a user, a switching element (152) connected to the handle (151) and switching the locking mechanism (130) between the engagement position and the unlocking position according to the operation of the handle (151), and a switching connection element (153) connected to the switching element (152), wherein the switching connection element (153) is separated from the inner housing (110) when the locking mechanism (130) is placed in the engaged position by the switching element (152) and comes into contact with the inner housing (110) when the locking mechanism (130) is placed in the unlocked position by the switching element (152). [2] The power tool (100; 200) according to claim 1, comprising a biasing member (142) disposed between the spindle (124) and the locking mechanism (130) and biasing the locking mechanism (130) to hold the locking mechanism (130) in the engaged position, wherein when the locking mechanism (130) is placed in the unlocking position by the switching member (152), the switching link member (153) is biased by the biasing member (142) to come into contact with the inner housing (110). [3] Power tool according to claim 1 or 2, wherein the switching element (152) includes a first cam (1521) and a second cam (1522) configured to rotate upon actuation of the handle (151), the locking mechanism (130) a collar member (135) configured to be movable, and a clamping member (131) configured to move between the engagement position and the unlocking position by moving relative to the collar member (135), and the first cam (1521) is configured to come into contact with a predetermined portion of the collar member (135), and the second cam (1522) is configured to come into contact with a portion of the collar member (135) that is spaced apart from the predetermined portion, whereby the clamping member (131) is moved between the engaged position and the unlocked position when the collar member (135) is moved by rotating the first and second cams (1521, 1522). [4] Power tool (100; 200) according to claim 3, wherein the switching connecting element (153) comprises an eccentric shaft (1531) connecting the first and second cams (1521, 1522). [5] Power tool (100; 200) according to one of claims 1 to 4, wherein the handle (151) has a handle rotating shaft (1513) arranged within the body case (101), and the switching element (152) and the switching connecting element (153) are formed on the handle rotating shaft (1513). [6] Power tool (100; 200) according to one of claims 1 to 5, wherein the inner housing (110) a first inner housing (1101), a second inner housing (1102) connected to the first inner housing (1101), and an inner housing spacing portion (1104) formed by arranging the first inner housing (1101) and the second inner housing (1102) with a predetermined spacing therebetween, at least a part of the locking mechanism (130) is accommodated in the first inner housing (1101), at least a part of the switching connection element (153) is arranged in the inner housing spacing region (1104), and the switching connection element (153) comes into contact with the second inner housing (1102) when the locking mechanism (130) is placed in the unlocking position by the switching element (152). [7] Power tool (100; 200) according to one of claims 1 to 6, wherein the body housing (101) and the inner housing (110) are connected to each other via an elastic member (111).

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