Pinching tool

Abstract

To provide a pinching tool capable of safely operating a disk body having a short diameter part on one side in the axial direction and a long diameter part having a diameter longer than that of the short diameter part on the other side in the axial direction.SOLUTION: The pinching tool includes a rod-shaped base portion, a grip portion provided on one side of the base portion and gripped by a user, a first pinching piece provided on a first lateral side of the other side end portion of the base portion and capable of coming into contact with a lateral surface and a peripheral surface of the minor axis portion, and a second pinching piece provided on a second lateral side opposite to the first lateral side of a portion between the grip portion and the first pinching piece of the base portion so as to be movable in a lateral direction of the base portion and capable of coming into contact with the lateral surface and the peripheral surface of the major axis portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to clamps. [Background technology]

[0002] At work sites such as logistics warehouses and factories, railway vehicle wheels are transported. For transporting railway vehicle wheels, a suspension device such as an overhead crane is used, as disclosed in Patent Document 1 below. The operation of the suspension device is controlled by a controller used by a worker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-057429 Summary of the Invention [Problem to be solved by the invention]

[0004] When such a suspension device is used to lower a railway vehicle wheel to a destination, the wheel may sway or rotate due to the swaying or swinging of the wire. In particular, railway vehicle wheels have an asymmetrical structure with a short diameter portion on one axial side and a long diameter portion (a so-called flange) on the other axial side that is longer than the short diameter portion, so the degree of sway and rotation is greater than that of wheels of other vehicles. Therefore, when a railway vehicle wheel is lowered to a destination using a suspension device, it can be difficult to lower the wheel in the correct orientation without it deviating from the destination.

[0005] On the other hand, when using a lifting device to lower a railway vehicle wheel to its desired position, if a worker has to manually fine-tune the position and orientation of the wheel, there is a possibility that the worker may be at risk of the wheel falling, etc.

[0006] The present disclosure has been made in consideration of the above-mentioned situation, and aims to provide a clamping tool that can safely manipulate a disk body that has a short diameter portion on one axial side and a long diameter portion on the other axial side that is longer in diameter than the short diameter portion. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the clamping device of the present disclosure is a clamping device that clamps a disk body having a short diameter portion on one axial side and a long diameter portion on the other axial side that is longer in diameter than the short diameter portion from both sides in the axial direction, and is equipped with a rod-shaped base, a gripping portion that is provided on one side of the base and is held by a user, a first clamping piece that is provided on a first lateral side of the other end of the base and is capable of contacting the side and peripheral surface of the short diameter portion, and a second clamping piece that is provided on a second lateral side opposite the first lateral side of the portion between the gripping portion and the first clamping piece of the base and is capable of moving freely in the lateral direction of the base and is capable of contacting the side and peripheral surface of the long diameter portion. [Effects of the Invention]

[0008] According to the present disclosure, a clamping tool can be provided that can safely manipulate a disk body having a short diameter portion on one axial side and a long diameter portion on the other axial side that is longer in diameter than the short diameter portion. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view showing the configuration of a clamping tool according to an embodiment of the present invention. [Figure 2] 2 is a schematic side view of the clamping tool of the present embodiment as seen from a first side. FIG. [Figure 3] 3 is a schematic side view of the clamping tool of the present embodiment as seen from a second side. FIG. [Figure 4] FIG. 2 is a schematic front view of the disk body of the present embodiment as viewed from one side in the axial direction. [Figure 5] 5 is an E-E cross-sectional view of the disk shown in FIG. 4. [Figure 6] 1 is a schematic perspective view showing an example of use of the clamping tool of the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1. Configuration of clamping tool FIG. 1 is a schematic perspective view showing the configuration of a clamping tool 1 of this embodiment. FIG. 2 is a schematic side view of the clamping tool 1 of this embodiment seen from a first lateral side. FIG. 3 is a schematic side view of the clamping tool 1 of this embodiment seen from a second lateral side. FIG. 4 is a schematic front view of a disk body 200 of this embodiment seen from one side in the axial direction A. FIG. 5 is an E-E cross-sectional view of the disk body 200 shown in FIG. 4. FIG. 6 is a schematic perspective view showing an example of use of the clamping tool 1 of this embodiment. First, the clamping tool 1 will be described mainly with reference to FIGS. 1 to 4.

[0011] The clamping tool 1 clamps a disk 200 (see FIGS. 4 and 5) from both sides in the axial direction A of the disk 200. The disk 200 is a railway vehicle wheel, and has a short diameter portion 210 on one side in the axial direction A, and a long diameter portion 220 on the other side in the axial direction A, the long diameter portion 220 having a diameter longer than that of the short diameter portion 210. The radial direction B of the disk 200 is a direction perpendicular to the axial direction A of the disk 200.

[0012] The clamping tool 1 includes a base 10, a gripping portion 30, a first clamping piece 50, and a second clamping piece 90. The base 10 is a rod-shaped member with a rectangular cross section and has a hollow structure with a cavity inside. Therefore, the base 10 can also be said to be a rectangular box-shaped member.

[0013] With respect to the base 10, the lateral direction C of the base 10 is a direction perpendicular to the extension direction D of the base 10, and corresponds to the axial direction A when the disk body 200 is clamped. Furthermore, the extension direction D of the base 10 corresponds to the radial direction B when the disk body 200 is clamped. In the following description, one side of the lateral direction C of the base 10 with the base 10 as the boundary will be referred to as a first lateral side, and the other side, i.e., the opposite side to the first lateral side, will be referred to as a second lateral side. Note that the first lateral side of the base 10 corresponds to one side of the axial direction A of the disk body 200, and the second lateral side of the base 10 corresponds to the other side of the axial direction A of the disk body 200.

[0014] The gripping portion 30 is a rectangular tubular member, and is provided on one side of the base 10 in the extension direction D of the base 10. Specifically, the gripping portion 30 is provided on one end of the base 10 in the extension direction D of the base 10 so that the axial direction of the gripping portion 30 and the extension direction D of the base 10 are perpendicular to each other. In this embodiment, the axial direction of the gripping portion 30 and the lateral direction C of the base 10 are the same direction.

[0015] The gripping portion 30 is gripped by a user of the clamping tool 1. Specifically, the gripping portion 30 includes a gripping member 30a on the side opposite to the clamping piece side (the side on which the first clamping piece 50 and the second clamping piece 90 are provided) of the gripping portion 30, and the gripping member 30a is gripped by the user of the clamping tool 1. The gripping member 30a extends in a direction intersecting the extension direction D of the base 10, specifically, in a direction perpendicular to the extension direction D of the base 10, and more specifically, in a direction perpendicular to both the extension direction D and the lateral direction C of the base 10.

[0016] The first clamping piece 50 is provided on a first lateral side of the other end of the base 10 in the extension direction D of the base 10. The first clamping piece 50 is generally L-shaped and is capable of contacting a peripheral surface 212 and a side surface 214 of the short diameter portion 210 of the disk body 200. The first clamping piece 50 includes a first receiving plate 52 and a first clamping plate 54.

[0017] The first receiving plate 52 is plate-shaped and extends in a direction perpendicular to both the lateral direction C and the extension direction D of the base 10, while being curved along the peripheral surface 212 of the short diameter portion 210. A first receiving surface 52a, which is the surface of the first receiving plate 52 opposite to the gripping portion 30 side, is a surface that can come into contact with the peripheral surface 212 of the short diameter portion 210, and is curved along the peripheral surface 212 of the short diameter portion 210.

[0018] The first clamping plate 54 is plate-shaped and extends in the extension direction D of the base 10. The end of the first clamping plate 54 on the gripping portion 30 side is connected to the end of the first receiving plate 52 on the opposite side to the base 10 side. A first clamping surface 54a, which is the surface of the first clamping plate 54 on the base 10 side, is a surface that can come into contact with the side surface 214 of the short diameter portion 210.

[0019] Such a first clamping piece 50 is supported by the first support portion 70 and is provided on a first lateral side of the other end portion of the base 10. The first support portion 70 extends in the lateral direction C of the base 10 on the first lateral side of the other end portion of the base 10, with one end portion connected to the other end portion of the base 10 and the other end portion connected to the first clamping piece 50. Specifically, the other end portion of the first support portion 70 is connected to a portion of the first clamping piece 50 that is closer to the gripping portion 30 than the first receiving surface 52a.

[0020] The second clamping piece 90 is provided on a second lateral side of the portion of the base 10 between the gripping portion 30 and the first clamping piece 50, so as to be movable in the lateral direction C of the base 10. The second clamping piece 90 is substantially L-shaped, and is capable of contacting the peripheral surface 222 and the side surface 224 of the major diameter portion 220 of the disk body 200. The second clamping piece 90 includes a second receiving plate 92, a second clamping plate 94, etc.

[0021] The second receiving plate 92 is plate-shaped and extends in a direction perpendicular to both the lateral direction C and the extension direction D of the base 10, while being curved along the circumferential surface 222 of the long diameter portion 220. A second receiving surface 92a, which is the surface of the second receiving plate 92 opposite to the gripping portion 30 side, is a surface that can come into contact with the circumferential surface 222 of the long diameter portion 220, and is curved along the circumferential surface 222 of the long diameter portion 220.

[0022] The second clamping plate 94 is plate-shaped and extends in the extension direction D of the base 10. An end of the second clamping plate 94 on the gripping portion 30 side is connected to an end of the second receiving plate 92 on the opposite side to the base 10 side. A second clamping surface 94a, which is the surface of the second clamping plate 94 on the base 10 side, is a surface that can come into contact with the side surface 224 of the long diameter portion 220.

[0023] Such a second clamping piece 90 is supported by the second support portion 110 and is arranged to be freely movable in the lateral direction C of the base 10 on the second lateral side of the portion between the gripping portion 30 of the base 10 and the first clamping piece 50.

[0024] The second support part 110 includes a support member 112, a reinforcing member 114, etc. The support member 112 is rod-shaped and extends in the lateral direction C of the base 10 on the second lateral side of the portion between the gripping part 30 of the base 10 and the first clamping piece 50, and penetrates a portion of the second clamping piece 90 that is closer to the gripping part 30 than the second receiving surface 92a. One end of the support member 112 is connected to the base 10, and the other end is connected to the reinforcing member 114.

[0025] In addition, in order to prevent rotation of the second clamping piece 90 around the lateral direction C of the base 10 as the rotation axis, two parallel extending support members 112 are inserted through the second clamping piece 90, and the support members 112 have a rectangular cross section.

[0026] The reinforcing member 114 is plate-shaped and extends in the extension direction D of the base 10 on the second lateral side of the base 10, while being bent so as to approach the base 10. One end of the reinforcing member 114 is connected to the other end of the support member 112, and the other end is connected to a portion of the base 10 between the gripping portion 30, the second clamping piece 90, and the gripping portion 30.

[0027] Furthermore, the distance between the first clamping piece 50 and the second clamping piece 90 in the extension direction D of the base 10 is the same as or greater than the distance between the peripheral surface 212 of the short diameter portion 210 and the peripheral surface 222 of the long diameter portion 220 in the radial direction B of the disk body 200.

[0028] Furthermore, the maximum distance between the first clamping piece 50 and the second clamping piece 90 in the lateral direction C of the base 10 is greater than the distance between the side surface 214 of the short diameter portion 210 and the side surface 224 of the long diameter portion 220 in the axial direction A of the disk body 200.

[0029] The clamping tool 1 also includes an operating lever 120, a tube portion 124, a transmission portion 126, and a biasing portion 128, and when the operating lever 120 is operated, the second clamping piece 90 moves in the lateral direction C of the base 10. The operating lever 120, the tube portion 124, the transmission portion 126, and the biasing portion 128 will be described below.

[0030] The grip portion 30 is provided with a pair of slits 32, 34. The slits 32, 34 extend in the extension direction D of the base portion 10 and face each other in a direction perpendicular to both the extension direction D of the base portion 10 and the axial direction of the grip portion 30.

[0031] The operating lever 120 is provided in the slits 32, 34 of the grip part 30. The operating lever 120 is rod-shaped and passes through the slits 32, 34. Furthermore, on the outside of the grip part 30, retainers 122 are attached to both ends of the operating lever 120 to prevent it from falling off the slits 32, 34. In other words, the operating lever 120 is freely movable in the extending direction D of the base part 10.

[0032] A through hole 36 extending in the extension direction D of the base 10 is formed at the connecting point between the gripping portion 30 and the base 10, connecting the inner periphery of the gripping portion 30 to the inside of the base 10. In addition, a through hole 12 extending in the lateral direction C of the base 10 is formed at the location of the base 10 facing the second clamping piece 90, connecting the inside of the base 10 to the outside of the base 10.

[0033] The pipe portion 124 extends from the inner circumferential side of the grip portion 30 to the second lateral side of the base portion 10, via the through-hole 36, the inside of the base portion 10, and the through-hole 12. The pipe portion 124 extends in the extension direction D of the base portion 10 from the inner circumferential side of the grip portion 30 to the other end portion inside the base portion 10, and extends from the other end portion inside the base portion 10 in the lateral direction C of the base portion 10.

[0034] The transmission part 126 transmits a force acting on one of the second clamping piece 90 and the operating lever 120 to the other, interlocking them. The transmission part 126 is a linear member such as a wire, and extends from the operating lever 120 to the second clamping piece 90 via the tube part 124. In other words, the transmission part 126 extends inside the tube part 124, with one end connected to the second clamping piece 90 and the other end connected to the operating lever 120. The length of the transmission part 126 is set to a length that allows the second clamping piece 90 and the operating lever 120 to interlock with each other.

[0035] According to the transmission unit 126, when the second clamping piece 90 moves away from the base 10, the operating lever 120 moves along the slits 32, 34 in a direction from one side of the base 10 to the other side. On the other hand, when the operating lever 120 moves along the slits 32, 34 in a direction from the other side of the base 10 to one side, the second clamping piece 90 approaches the base 10.

[0036] The biasing portion 128 is provided on the second lateral side of the base 10, and biases the second clamping piece 90 in a direction away from the base 10. Specifically, the biasing portion 128 is provided on the second lateral side of the base 10, between the base 10 and the second clamping piece 90, and biases the second clamping piece 90 in a direction away from the base 10 by pressing the second clamping piece 90.

[0037] The biasing portion 128 is, for example, a general-purpose compression coil spring, one end of which is connected to a portion of the base 10 facing the second clamping piece 90, and the other end of which is connected to the second clamping piece 90. The support member 112 is inserted into the biasing portion 128.

[0038] According to the biasing portion 128, when the operating lever 120 is not operated by the user, the biasing force of the biasing portion 128 causes the second clamping piece 90 to move away from the base portion 10. Therefore, when the operating lever 120 is not operated by the user, the clamping tool 1 is maintained in the state shown in Figures 1 to 4.

[0039] For these reasons, in the clamping tool 1, when the user operates the operating lever 120 (holding the entire clamping tool 1 together with the operating lever 120), the operating lever 120 moves along the slits 32 and 34 in a direction from the other side of the base 10 toward one side, and the second clamping piece 90 approaches the base 10. Furthermore, as the second clamping piece 90 approaches the base 10, a force that resists the biasing force of the biasing part 128, i.e., a compressive force, acts on the biasing part 128. On the other hand, when the user stops operating the operating lever 120 (releasing the grip of the operating lever 120), the biasing force of the biasing part 128 causes the second clamping piece 90 to move away from the base 10, and the operating lever 120 moves along the slits 32 and 34 in a direction from one side of the base 10 toward the other side. In other words, when the user stops operating the operating lever 120 (releasing the grip of the operating lever 120), the clamping tool 1 returns to the state it was in before the operating lever 120 was operated.

[0040] 2. Disk Next, the disk body 200 will be described mainly with reference to Figures 4 and 5. As described above, the disk body 200 is a wheel of a railway vehicle, and includes a core 202, a rim 204, and the like.

[0041] Core 202 is a disk-shaped plate member. Rim 204 is a cylindrical member provided on the circumferential surface of core 202. The other side of rim 204 in axial direction A of disk body 200 protrudes outward in radial direction B of disk body 200.

[0042] Therefore, disk body 200 has a short diameter portion 210 on one side in the axial direction A, and a long diameter portion 220 on the other side in the axial direction A, the long diameter portion 220 having a diameter longer than that of short diameter portion 210. Furthermore, short diameter portion 210 includes a peripheral surface (tread surface) 212 and a side surface 214, etc., and long diameter portion 220 includes a peripheral surface 222 and a side surface 224, etc. Note that side surface 214 can also be said to be one end surface of disk body 200 in the axial direction A, and side surface 224 can also be said to be the other end surface of disk body 200 in the axial direction A.

[0043] When the disk body 200 is to be installed in an inspection device or simply carried out, it is suspended in mid-air by a suspension device such as an overhead crane. When the disk body 200 is to be lowered to a target position, an operator controls the suspension device with a controller to adjust the position, orientation, etc. of the disk body 200.

[0044] 3. Examples of clamping tool use Next, an example of how to use the clamping tool 1 will be described mainly with reference to Fig. 6. The disk body 200 shown in Fig. 6 is suspended in mid-air by a suspension device or the like.

[0045] First, the user of the clamping device 1 grasps the gripping member 30a of the gripping portion 30 without including the operating lever 120, aligns the lateral direction C of the base 10 with the axial direction A of the disc body 200, aligns the extension direction D of the base 10 with the radial direction B of the disc body 200, aligns the first lateral side of the base 10 with one side of the disc body 200, aligns the second lateral side of the base 10 with the other side of the disc body 200, and faces the first clamping piece 50 and the second clamping piece 90 toward the disc body 200.

[0046] Next, the user of the clamping device 1 sets the distance between the first clamping surface 54a of the first clamping piece 50 and the second clamping surface 94a of the second clamping piece 90 in the lateral direction C of the base 10 to be slightly larger than the size in the axial direction A of the disc body 200, and brings the clamping device 1 closer to the disc body 200 along the radial direction B of the disc body 200.

[0047] Next, the user of the clamping device 1 brings the first receiving surface 52a of the first clamping piece 50 into contact with the peripheral surface 212 of the short diameter portion 210, the first clamping surface 54a of the first clamping piece 50 into contact with the side surface 214 of the short diameter portion 210, and the second receiving surface 92a of the second clamping piece 90 into contact with the peripheral surface 222 of the long diameter portion 220.

[0048] Next, the user of the clamping device 1 operates the operating lever 120 (holds the operating lever 120 together) and brings the second clamping piece 90 closer to the base 10, thereby bringing the second clamping surface 94a of the second clamping piece 90 into contact with the side surface 224 of the long diameter portion 220, and as shown in Figure 6, the first clamping piece 50 and the second clamping piece 90 clamp the disk body 200 from both sides in the axial direction A.

[0049] According to the clamping tool 1 of this embodiment, the disk body 200 can be clamped from both sides in the axial direction A at a position away from the disk body 200, and the position and orientation of the disk body 200 suspended in mid-air by a suspension device or the like can be adjusted. In other words, according to the clamping tool 1 of this embodiment, the suspended disk body 200 can be safely operated.

[0050] Furthermore, in the clamping tool 1 of this embodiment, the distance between the first clamping piece 50 and the second clamping piece 90 can be adjusted in the lateral direction C of the base 10. Therefore, the clamping tool 1 of this embodiment can accommodate disk bodies 200 of various sizes.

[0051] Furthermore, in the clamping tool 1 of this embodiment, an operating lever 120 is provided on the gripping portion 30, and when the operating lever 120 is operated, the second clamping piece 90 moves in the lateral direction C of the base 10. Therefore, the operator can use the clamping tool 1 with only one hand to clamp the disk body 200 from both sides in the axial direction A. In other words, with the clamping tool 1 of this embodiment, the disk body 200 can be easily clamped from both sides in the axial direction A.

[0052] Furthermore, if a worker can use the clamping tool 1 with only one hand to clamp the disk body 200 from both sides in the axial direction A, the worker can operate the controller of the suspension device with the other hand. In other words, the clamping tool 1 of this embodiment allows the worker to efficiently carry the disk body 200.

[0053] Furthermore, in the clamping tool 1 of this embodiment, the biasing portion 128 biases the second clamping piece 90 in a direction away from the base 10, and when the operating lever 120 is operated, the second clamping piece 90 approaches the base 10. In other words, in the clamping tool 1 of this embodiment, the operation for moving the first clamping piece 50 away from the base 10 can be omitted. Therefore, according to the clamping tool 1 of this embodiment, the distance between the first clamping piece 50 and the second clamping piece 90 in the lateral direction C of the base 10 can be easily adjusted.

[0054] In addition, in this embodiment, the first receiving surface 52a of the first clamping piece 50 is curved along the circumferential surface 212 of the short diameter portion 210, and the second receiving surface 92a of the second clamping piece 90 is curved along the circumferential surface 222 of the long diameter portion 220. Therefore, the first receiving surface 52a of the first clamping piece 50 is in surface contact with the circumferential surface 212 of the short diameter portion 210, and the second receiving surface 92a of the second clamping piece 90 is in surface contact with the circumferential surface 222 of the long diameter portion 220. As a result, in the process of clamping the disk body 200 with the clamping tool 1 and in the state in which the disk body 200 is clamped with the clamping tool 1, the extension direction D of the base 10 is prevented from tilting with respect to the radial direction B of the disk body 200. In other words, the clamping tool 1 of this embodiment can stabilize the clamping state of the disk body 200.

[0055] 4. Variations This concludes the description of the embodiment of the present invention, but the specific configuration shown in this embodiment is just an example, and the aspects of the present invention are not limited to the configuration shown in this embodiment.

[0056] In the clamping tool 1 of the above embodiment, each of the first receiving surface 52 a, the first clamping surface 54 a, the second receiving surface 92 a, and the second clamping surface 94 a may be provided with an elastic body, specifically, a viscoelastic body. Examples of the viscoelastic body include a resin sheet.

[0057] In this way, if an elastic body is provided on each of the surfaces that can come into contact with the short diameter portion 210 of the first clamping piece 50 and the long diameter portion 220 of the second clamping piece 90, it is possible to prevent the disc body 200 from coming off the clamping tool 1 when the disc body 200 is clamped by the clamping tool 1.

[0058] Furthermore, the biasing portion 128 in the above embodiment may be provided between the second clamping piece 90 and one end of the reinforcing member 114, and may pull the second clamping piece 90 to bias the second clamping piece 90 in a direction away from the base 10. In this case, the biasing portion 128 may be, for example, a general-purpose tension spring, with one end connected to the side of the second clamping piece 90 opposite to the base 10 side, and the other end connected to one end of the reinforcing member 114.

[0059] Furthermore, the configuration of the transmission unit 126 is not particularly limited as long as it is capable of transmitting a force acting on one of the second clamping piece 90 and the operating lever 120 to the other and interlocking them. For example, the transmission unit 126 may be a transmission mechanism including a rack, gears, etc. Furthermore, the transmission unit 126 may be configured so that the operating lever 120 can receive both an operation for moving the second clamping piece 90 closer to the base 10 and an operation for moving the second clamping piece 90 away from the base 10.

[0060] Furthermore, the biasing portion 128 may be omitted from the clamping tool 1 of the above embodiment. Even if the biasing portion 128 is omitted from the clamping tool 1, the second clamping piece 90 can be moved away from the base 10 by rotating the clamping tool 1 itself around the extension direction D of the base 10 as the rotation axis after bringing the second clamping piece 90 close to the base 10.

[0061] Furthermore, the shapes of the various components of the clamping tool 1 of the above embodiment are not particularly limited as long as they can clamp the disk body 200, as described above. For example, a square shape may be replaced with a circular shape.

[0062] The present disclosure includes, for example, the following aspects. [1] A clamping tool for clamping a disk body from both sides in an axial direction, the disk body having a short diameter portion on one side in an axial direction and a long diameter portion on the other side in the axial direction, the long diameter portion being longer than the short diameter portion, A rod-shaped base; a grip portion provided on one side of the base portion and adapted to be gripped by a user; a first clamping piece provided on a first lateral side of the other end of the base portion and capable of contacting a side surface and a peripheral surface of the minor diameter portion; A clamping tool comprising a second clamping piece that is provided on a second lateral side opposite the first lateral side of the portion between the gripping portion of the base and the first clamping piece, and that is movable in the lateral direction of the base and can contact the side and peripheral surface of the major diameter portion. [2] The grip portion is provided with an operating lever, The clamping tool described in [1], wherein when the operating lever is operated, the second clamping piece moves in a lateral direction of the base. [3] a biasing portion provided on a second side of the base portion and biasing the second clamping piece in a direction away from the base portion; The clamping tool according to [2], wherein when the operating lever is operated, the second clamping piece approaches the base. [4] A clamping tool described in any one of [1] to [3], wherein the surface of the first clamping piece that can come into contact with the circumferential surface of the short diameter portion is curved along the circumferential surface of the short diameter portion, and the surface of the second clamping piece that can come into contact with the circumferential surface of the long diameter portion is curved along the circumferential surface of the long diameter portion. [5] A clamping device described in any one of [1] to [3], wherein an elastic body is provided on each of the surfaces of the first clamping piece that can come into contact with the short diameter portion and the second clamping piece that can come into contact with the long diameter portion. [Explanation of symbols]

[0063] 1 Clamping tool 10 base 30 Gripping part 50 1st clamping piece 52a First receiving surface 54a 1st clamping surface 90 Second clamping piece 92a Second receiving surface 94a Second clamping surface 120 Operating lever 128 energizing part 200 discs 210 Short diameter section 212 Peripheral surface 214 Side 220 Long diameter 222 Peripheral surface 224 Side A axis direction B Radial direction C Lateral direction D Extension direction

Claims

1. A clamping tool for clamping a disk body from both sides in an axial direction, the disk body having a short diameter portion on one side in an axial direction and a long diameter portion on the other side in the axial direction, the long diameter portion being longer than the short diameter portion, A rod-shaped base; a grip portion provided on one side of the base portion and adapted to be gripped by a user; a first clamping piece provided on a first lateral side of the other end of the base portion and capable of contacting a side surface and a peripheral surface of the minor diameter portion; A clamping tool comprising: a second clamping piece that is arranged on a second lateral side of the base, opposite the first lateral side, of the portion between the gripping portion of the base and the first clamping piece, and that is movable in the lateral direction of the base and can contact the side and peripheral surface of the long diameter portion.

2. The grip portion is provided with an operating lever, The clamping tool according to claim 1 , wherein the second clamping piece moves in a lateral direction of the base when the operating lever is operated.

3. a biasing portion provided on a second side of the base portion and biasing the second clamping piece in a direction away from the base portion; The clamping tool according to claim 2 , wherein when the operating lever is operated, the second clamping piece approaches the base portion.

4. 2. The clamping tool of claim 1, wherein the surface of the first clamping piece that can come into contact with the peripheral surface of the short diameter portion is curved along the peripheral surface of the short diameter portion, and the surface of the second clamping piece that can come into contact with the peripheral surface of the long diameter portion is curved along the peripheral surface of the long diameter portion.

5. The clamping tool according to claim 1 , wherein an elastic body is provided on each of a surface of the first clamping piece that can come into contact with the short diameter portion and a surface of the second clamping piece that can come into contact with the long diameter portion.

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