Washer installation tool

Abstract

To provide a washer mounting tool for mounting a washer so as to match a predetermined position in a circumferential direction with a mounted part.SOLUTION: A washer mounting tool 1 of a washer has a projection in an outer diameter part. In a mounted part, a cylindrical side part where a part corresponding to the projection is notched in an axial direction in a cylinder having the same outer diameter as the bottom face part is erected in the bottom face part of a columnar recess having the inner diameter as the outer diameter of the projection. The washer mounting tool 1 has a body part 4 having a first cylinder side part 42b for supporting the projection of the washer, a slide part 5 which is slidable relative to the body part 4 and has an inner diameter part insertion part 54 and a second cylinder side part 55b having such a shape as to correspond to the cylinder side part, and a spring 6 for energizing the slide part 5. When the washer is brought into contact with the cylinder side part of the mounted part and presses the body 4 while rotating, in a state where the second cylinder side part 55b is inserted to a part other than the projection of the washer, the second cylinder side part 55b is moved in an opposite direction to the bottom face part by the cylinder side part, the washer is arranged in the bottom face part of the recess.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a washer installation tool, and more particularly to an installation tool for a washer having a protrusion on its outer diameter portion. [Background technology]

[0002] Conventionally, an installation tool has been used to facilitate the installation of a washer on a mounting portion. The washer installation tool described in Patent Document 1 includes a cylindrical holding member and a base that slidably houses the holding member, and the washer is installed by pressing the washer attached to the tip of the holding member against the mounting portion with the base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-33672 Summary of the Invention [Problem to be solved by the invention]

[0004] The installation tool described in the above-mentioned Patent Document 1 can easily install washers that can be installed at any circumferential position on the mounting surface. However, some washers require that a specific circumferential position of the washer be aligned with a specific position on the mounting surface. For example, this applies when the washer has a protrusion that protrudes radially from its outer diameter. Such washers must be installed by fitting the protrusion into a corresponding recess on the mounting surface, which poses a problem of poor installation workability when using the above-mentioned installation tool.

[0005] In view of the above problems, an object of the present invention is to provide a washer installation tool that installs a washer by aligning it with a predetermined circumferential position relative to a mounting portion. [Means for solving the problem]

[0006] A first aspect of the present invention is a washer installation tool for installing a washer having an inner diameter portion and an outer diameter portion, and having a convex portion on part of the outer diameter portion that protrudes radially by a certain distance and extends circumferentially, to an installation target portion, wherein the installation target portion has a cylindrical recess whose inner diameter is approximately the same as the outer diameter of the convex portion, and a cylindrical side portion formed by cutting out a portion of the cylinder, the cylinder having an axis coincident with the recess and an outer diameter equal to the diameter of the bottom surface portion, in the direction extending of the axis, corresponding to the convex portion, and the washer installation tool comprises a main portion having a first support portion shaped to correspond to the notch, which is a portion of the cylinder other than the cylindrical side portion that abuts against and supports the convex portion of the washer in the axial direction, and a washer installation tool that is slidable in the axial direction relative to the main portion and is inserted into the inner diameter portion of the washer. and a spring that biases the sliding part toward the tip of the axial rod part relative to the main body part, wherein the second support part is inserted into a part of the washer supported on the main body part other than the convex part, preventing the washer from rotating, and the washer is brought into contact with the cylindrical side part of the attached part and pressed toward the bottom part while rotating the main body part around the axis; when the convex part matches the notch, the second support part is pressed in the opposite direction from the bottom part by the cylindrical side part, and the sliding part moves in the opposite direction from the bottom part against the biasing force of the spring, and the washer is placed on the bottom part of the recess.

[0007] According to the first aspect of the present invention, the washer can be attached to the mounting portion by inserting the axial rod of the washer attachment tool through the inner diameter portion of the washer, supporting the protrusion with the first support portion, and inserting the second support portion into the portion other than the protrusion, and then inserting the washer attachment tool from the tip of the axial rod into the recess and pressing it against the bottom while rotating it. This allows the washer to be attached to the mounting portion with a simple operation, with the protrusion of the washer aligned with the notch in the mounting portion.

[0008] A second aspect of the present invention is characterized in that, in the first aspect, a plurality of the protrusions are provided at equal angular intervals around the axis of the washer.

[0009] According to the second invention, multiple protrusions are provided at equal angular intervals, so when the washer mounting tool is rotated in the recess, the protrusions and cutouts align with each other with a small rotation angle, allowing for easy alignment.

[0010] The third invention of the present invention is characterized in that, in the first or second invention, when the axial rod portion is passed through the inner diameter portion of the washer and the convex portion is supported by the first support portion, the outer diameter portion of the axial rod portion is provided with an engaging groove whose width extending circumferentially is slightly larger than the plate thickness of the washer at the position where the inner diameter portion abuts.

[0011] According to the third aspect of the present invention, when the washer is attached to the washer attachment tool, part of the inner diameter portion is inserted into the locking groove, making it easy to catch and difficult to move axially relative to the shank. This makes it difficult for the washer to come off the shank even when the washer attachment tool with the washer attached is held with the washer facing downward, making it easy to attach the washer to the attachment target. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a washer installation tool according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the washer attaching tool of the embodiment. [Figure 3] 3A and 3B are diagrams illustrating a main body of the washer attaching tool of the embodiment. [Figure 4] 4A to 4C are diagrams illustrating a sliding portion of the washer attaching tool of the embodiment. [Figure 5] 3A to 3C are diagrams illustrating a washer in the embodiment. [Figure 6] 4A and 4B are diagrams illustrating a mounting portion in the embodiment. [Figure 7] 4A and 4B are diagrams illustrating a mounting portion in the embodiment. [Figure 8] 10A to 10C are diagrams illustrating a procedure for attaching a washer using the washer attaching tool of the embodiment. [Figure 9] 10A to 10C are diagrams illustrating a procedure for attaching a washer using the washer attaching tool of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] A washer installation tool 1 according to one embodiment of the present invention will be described with reference to Figures 1 to 9. The washer installation tool 1 is a tool for installing a washer 2 shown in Figure 5 at a predetermined position in a gear case 3 shown in Figures 6 and 7.

[0014] Prior to describing the washer mounting tool 1, the washer 2 and the gear case 3 to which the washer 2 is attached will be described.

[0015] As shown in Figure 5, washer 2 is a resin plate component placed between abutting components to reduce sliding resistance between the components. Washer 2 has a circular inner diameter portion 21 and an outer diameter portion 22 that shares an axis C1 with inner diameter portion 21. On outer diameter portion 22, protrusions 23 that protrude radially outward and extend circumferentially are arranged at 90° intervals around axis C1. Tip end 23a of each protrusion 23 is shaped as part of a circle whose diameter is larger than that of outer diameter portion 22 and is centered on axis C1.

[0016] As shown in Figures 6 and 7, the gear case 3 is a resin member that houses a reduction gear that constitutes a lifter mechanism for an automobile seat. The gear case 3 is formed with a first recessed portion 31, which is a cylindrical recessed portion into which the reduction gear is inserted, and a second recessed portion 32, which is a cylindrical recessed portion having an axis that is in a twisted positional relationship with the axis of the first recessed portion 31 and into which a drive shaft of a motor (not shown) is inserted. The central axis of the second recessed portion 32 is the axis C1, and the second recessed portion 32 has an annular bottom surface portion 33. The outer diameter of the bottom surface portion 33 is set slightly larger than the diameter of a circle that includes the tip ends 23a of the protrusions 23 of the washer 2. On the outer diameter side of the bottom surface portion 33, cylindrical side portions 32a, which form part of a cylinder whose central axis is the axis C1, are arranged at 90° angular intervals from each other around the axis C1. The inner diameter of each cylindrical side portion 32a is slightly larger than the outer diameter of the outer diameter portion 22 of the washer 2, and the outer diameter is set to be the same as the outer diameter of the bottom surface portion 33. The cylindrical portion between each cylindrical side portion 32a is formed as a notch 32b cut out in the direction of the axis C1. The inner diameter of the notch 32b is set to be the same as the outer diameter of the bottom surface portion 33. This allows the washer 2 to be attached by abutting against the bottom surface portion 33 in a state where rotation with respect to the gear case 3 is stopped, with each protrusion 23 inserted into each notch 32b of the gear case 3. Here, the second recessed portion 32 corresponds to the "recess" in the claims. Furthermore, the second recessed portion 32, in which the cylindrical side portion 32a is arranged on the bottom surface portion 33, corresponds to the "attached portion" in the claims.

[0017] As shown in Figures 1 to 4, the washer attachment tool 1 has a substantially cylindrical main body 4, which is the part that the operator grips, and a substantially columnar sliding part 5 that is arranged inside the main body 4 and is slidable in the direction of axis C2 relative to the main body 4.

[0018] 2 and 3, the main body 4 has a small diameter portion 41 which is a portion gripped by an operator, and a large diameter portion 42 which is disposed on one end side of the small diameter portion 41 in the direction of the axis C2 and shares the axis C2 with the small diameter portion 41. The ratio of the outer diameter of the large diameter portion 42 to the outer diameter of the small diameter portion 41 is approximately 4:3, and the ratio of the dimension of the large diameter portion 42 in the direction of the axis C2 to the dimension of the small diameter portion 41 in the direction of the axis C2 is approximately 1:3.

[0019] The small diameter portion 41 has a cylindrical shape with an outer diameter surface portion 41a and an inner diameter surface portion 41b, and has a bottom surface portion 41c extending radially inward on the side opposite the large diameter portion 42, which is the other end side in the direction of the axis C2. A cylindrical through hole 41c1 is formed in the bottom surface portion 41c, and the through hole 41c1 shares the axis C2. The inner diameter of the inner diameter surface portion 41b is set slightly larger than the outer diameter of a main shaft portion 51 of the sliding portion 5, which will be described later. The inner diameter of the through hole 41c1 is set slightly larger than the outer diameter of a bolt portion 53 of the sliding portion 5, which will be described later.

[0020] The large diameter portion 42 has a cylindrical portion 42a connected to the small diameter portion 41 and four first cylindrical side portions 42b extending from an end face 42a1 of the cylindrical portion 42a opposite the small diameter portion 41 in a direction opposite the small diameter portion 41. The inner diameter portion of the cylindrical portion 42a is formed as a common surface with the inner diameter surface portion 41b. The ratio of the dimension of the cylindrical portion 42a in the direction of the axis C2 to the dimension of each of the first cylindrical side portions 42b in the direction of the axis C2 is approximately 1:1. Each of the first cylindrical side portions 42b is formed by cutting out four notches in the direction of the axis C2 from a cylinder having the same outer diameter as the cylindrical portion 42a and equal to a circle including the tip ends 23a of each of the protrusions 23 of the washer 2, and an inner diameter slightly larger than the outer diameter of the outer diameter portion 22 of the washer 2. The end surface 42b1 of each first cylindrical side portion 42b opposite the cylindrical portion 42a matches the shape of the protrusion 23 of the washer 2. The first cylindrical side portions 42b are arranged at equal angular intervals of 90° around the axis C2 when viewed from the direction of the axis C2. The end side of each first cylindrical side portion 42b opposite the cylindrical portion 42a is formed as an inclined surface 42b2 whose outer diameter gradually decreases toward the tip. This is intended to make it easier to insert the washer installation tool 1 with the washer 2 attached into the second recessed portion 32 of the gear case 3 (described later) from the side of each first cylindrical side portion 42b. Here, the first cylindrical side portion 42b is the "first support portion" in the claims.

[0021] As shown in Figures 2 and 4, the sliding part 5 has a cylindrical main shaft part 51, a washer temporary fixing part 52 arranged on one end side of the main shaft part 51 in the direction of the axis C2 and sharing the axis C2, and a bolt part 53 arranged on the other end side of the main shaft part 51 in the direction of the axis C2 and sharing the axis C2.

[0022] The main shaft portion 51 is cylindrical, and its outer diameter is set to be slightly smaller than the inner diameter of the inner diameter surface portion 41b of the main body portion 4, so that when the sliding portion 5 is attached to the main body portion 4, it can slide in the direction of the axis C2 relative to the inner diameter surface portion 41b. One end surface of the main shaft portion 51 in the direction of the axis C2 is a first end surface portion 51a, and the other end surface in the direction of the axis C2 is a second end surface portion 51b.

[0023] 2 and 4, washer temporary fixing portion 52 is attached to first end surface portion 51a of main shaft portion 51, and has inner diameter portion insertion portion 54 and rotation prevention portion 55. Main shaft portion 51 and rotation prevention portion 55 are integrally formed. Here, inner diameter portion insertion portion 54 corresponds to the "shaft portion" in the claims.

[0024] The bore insertion portion 54 has a cylindrical shape with the axis C2 as its central axis and is provided with a bolt hole 54a at its center, with the axis C2 as its central axis. The outer diameter portion 54b of the bore insertion portion 54 is set to be slightly smaller than the inner diameter of the bore portion 21 of the washer 2, so that when the bore insertion portion 54 is inserted into the bore portion 21 of the washer 2, the washer 2 is temporarily fixed to the bore insertion portion 54. Furthermore, the outer diameter portion 54b of the bore insertion portion 54 is provided with a groove 54b1 extending circumferentially in the approximate center in the direction of the axis C2. The width of the groove 54b1 is set to be slightly larger than the thickness of the washer 2, so that the washer 2 can be temporarily fixed to the bore insertion portion 54 more easily. A chamfered portion 54b2 is provided at the corner of the bore insertion portion 54 opposite the main shaft portion 51. The chamfered portion 54b2 functions to facilitate insertion of the inner diameter portion insertion portion 54 into the inner diameter portion 21 of the washer 2. Here, the groove 54b1 corresponds to the "locking groove" in the claims.

[0025] Anti-rotation portion 55 has a cylindrical portion 55a with its central axis coincident with axis C2, and four second cylindrical side portions 55b provided on the outer diameter surface of cylindrical portion 55a and protruding radially outward. Cylindrical portion 55a has an outer diameter set slightly larger than the outer diameter of outer diameter portion 22 of washer 2, and outer bottom surface portion 55a1, which is the end face opposite main shaft portion 51, is provided with a cylindrical recess 55a2 with its central axis coincident with axis C2 and recessed toward main shaft portion 51. Concave bottom surface portion 55a3, on the opposite side from the opening of recess 55a2, is provided with a cylindrical threaded hole 55a4 with its central axis coincident with axis C2 and extending toward main shaft portion 51 and continuously into main shaft portion 51. The inner diameter of the recess 55a2 is set slightly larger than the outer diameter portion 54b of the inner diameter portion insertion portion 54, so that the side of the inner diameter portion insertion portion 54 opposite to the side where the chamfered portion 54b2 is provided can be inserted. When the inner diameter portion insertion portion 54 is inserted into the recess 55a2, the bolt hole 54a and the screw hole 55a4 are aligned, so that the inner diameter portion insertion portion 54 can be fastened and fixed to the washer temporary fixing portion 52 and the main shaft portion 51 by a bolt B. Each second cylindrical side portion 55b is formed as part of a cylinder having an outer diameter equal to the outer diameter of each first cylindrical side portion 42b of the main body 4 and an inner diameter equal to the outer diameter of the tubular portion 55a, with the axis C2 as its central axis, by cutting out four notches in the direction of extension of the axis C2. The cross-sectional shape of the four notches 55b2 taken perpendicular to the axis C2 substantially matches the cross-sectional shape of each first cylindrical side portion 42b of the main body 4 taken perpendicular to the axis C2, and the four second cylindrical side portions 55b are adapted to be slidably assembled with each first cylindrical side portion 42b of the main body 4 in the direction of extension of the axis C2. An outer end surface portion 55b3, which is the end surface of each second cylindrical side portion 55b opposite the main shaft portion 51, is positioned approximately five times the thickness of the washer 2 away from the outer bottom surface portion 55a1 toward the tip in the direction of extension of the axis C2. Here, the second cylindrical side portion 55b corresponds to the "second support portion" in the claims.

[0026] 2 and 4, bolt portion 53 is erected on second end surface portion 51b of main shaft portion 51, sharing axis C2. The outer diameter of bolt portion 53 is set slightly smaller than the inner diameter of through hole 41c1 of main body portion 4, and bolt portion 53 is slidable along axis C2 relative to the wall surface of through hole 41c1. A male thread 53a is formed on the tip end side of bolt portion 53 in the direction of axis C2.

[0027] 1 to 4, the assembly procedure for the washer attachment tool 1 will be described. First, the inner diameter portion insertion portion 54 is attached to the rotation prevention portion 55 of the sliding portion 5. Specifically, the inner diameter portion insertion portion 54 is inserted into the recess 55a2 of the rotation prevention portion 55 from the side opposite to the side where the chamfered portion 54b2 is provided, and then the rotation prevention portion 55 is fastened to the main shaft portion 51 with the bolt B. At this time, the groove 54b1 of the washer temporary fixing portion 52 and the outer end surface portion 55b3 of each second cylindrical side portion 55b are aligned in the direction of the axis C2. Next, with the bolt portion 53 of the sliding portion 5 inserted through the inner diameter portion of the spring 6, which is a compression coil spring, the sliding portion 5 is inserted into the inner diameter surface portion 41b of the main body 4 from the bolt portion 53 side, and the bolt portion 53 is inserted into the through hole 41c1. As a result, the spring 6 is sandwiched between the inner surface of the bottom surface 41c of the main body 4 and the second end surface 51b of the sliding part 5, causing it to be compressed and deformed. At the same time, the second cylindrical side portions 55b of the sliding part 5 are fitted between the first cylindrical side portions 42b of the main body 4, allowing the sliding part 5 to slide along the axis C2 while its rotation relative to the main body 4 is restricted. Finally, in this state, the first nut 7 is threaded onto the male thread 53a of the bolt part 53, compressing and deforming the spring 6, and adjusting the position of the sliding part 5 along the axis C2 relative to the main body 4. Specifically, the outer end surface portions 55b3 of the second cylindrical side portions 55b of the sliding part 5 protrude from the end surfaces 42b1 of the first cylindrical side portions 42b of the main body 4 by the thickness of the washer 2 in the direction opposite the small diameter portion 41. Then, in this state, the second nut 8 is tightened onto the first nut 7 to stop the rotation of the first nut 7. This state is the washer temporarily fixed state S1 shown in Fig. 8. From this state, as shown in Fig. 9, the sliding part 5 compresses and deforms the spring 6 relative to the main body part 4, and the inner end surface part 55b4 of each second cylindrical side part 55b becomes slidable in the direction of the axis C2 until it abuts against the end surface 42a1. Here, the spring 6 corresponds to the "spring" in the claims.

[0028] 1 and 5 to 9, a procedure for attaching a washer 2 to a gear case 3 using a washer attachment tool 1 will be described. In the initial state of the washer attachment tool 1 shown in FIGS. 1 and 8, the washer 2 is temporarily fixed to the tip of the washer attachment tool 1. Specifically, the washer 2 is temporarily fixed by placing each of the protruding portions 23 on the end surfaces 42b1 of the first cylindrical side portions 42b of the main body 4, which are recessed toward the small diameter portion 41 from the outer end surfaces 55b3 of the second cylindrical side portions 55b of the sliding portion 5. At this time, the inner diameter portion insertion portion 54 of the sliding portion 5 is inserted into the inner diameter portion 21 of the washer 2, and the groove 54b1 is disposed opposite the periphery of the inner diameter portion 21. Therefore, even if the washer 2 moves slightly in the radial direction, a portion of the periphery of the inner diameter portion 21 gets caught on the side wall of the groove 54b1, making it less likely to fall off. As a result, even when the washer installation tool 1 is operated to tilt the tip end portion to which the washer 2 is temporarily fixed in order to insert it into the second recessed portion 32 of the gear case 3, the washer 2 can be brought into contact with the bottom surface portion 33 in a state in which it will not fall out of the washer installation tool 1. This state is the washer temporarily fixed state S1 shown in FIG. 8. In the washer temporarily fixed state S1, the washer 2 temporarily fixed to the tip end portion of the washer installation tool 1 is inserted into the second recessed portion 32 of the gear case 3 with the axis C2 aligned with the axis C1. Then, with the washer 2 and the outer end surface portions 55b3 of each second cylindrical side portion 55b in contact with and pressed against the end surface portions of each cylindrical side portion 32a opposite the bottom surface portion 33, the main body 4 of the washer installation tool 1 is rotated. When the protrusions 23 of the washer 2 align with the notches 32b, the washer 2 is pressed against the bottom surface 33, and the second cylindrical side portions 55b of the sliding portion 5 are pressed toward the opening of the second recessed portion 32 by the cylindrical side portions 32a of the gear case 3. At this time, the sliding portion 5 moves toward the bottom surface 41c of the main body 4 while compressing and deforming the spring 6. FIG. 9 shows a washer temporary fixation release state S2, which is the state of the tip of the washer attachment tool 1 when the sliding portion 5 moves toward the bottom surface 41c of the main body 4. When the washer attachment tool 1 in the washer temporary fixation release state S2 is pulled out from the second recessed portion 32 of the gear case 3, the washer 2 is positioned at a predetermined position on the bottom surface 33 of the second recessed portion 32.At this time, as the washer attaching tool 1 is pulled out from the gear case 3, the sliding part 5 is returned to its initial position relative to the main body part 4 by the action of the spring 6.

[0029] The present embodiment configured as described above provides the following advantageous effects. The inner diameter portion insertion portion 54 of the washer installation tool 1 is inserted into the inner diameter portion 21 of the washer 2, with the protrusions 23 supported by the first cylindrical side portions 42b and the second cylindrical side portions 55b inserted into the portions other than the protrusions 23. Then, the washer installation tool 1 is inserted into the second recessed portion 32 of the gear case 3 from the washer 2 side, with the axis C2 aligned with the axis C1. The washer 2 and the outer end surfaces 55b3 of the second cylindrical side portions 55b are pressed against the end surfaces of the cylindrical side portions 32a opposite the bottom surface 33, and the main body 4 of the washer installation tool 1 is rotated. When the protrusions 23 of the washer 2 are aligned with the notches 32b, the washer 2 abuts against the bottom surface 33 and is positioned in a predetermined position within the second recessed portion 32. This allows the washer 2 to be attached in the second recess 32 with the projections 23 of the washer 2 aligned with the notches 32b in the second recess 32 by a simple operation.

[0030] Furthermore, since the protrusions 23 of the washer 2 are arranged at 90° intervals from one another around the axis C1, when the washer attachment tool 1 is rotated in the second recess 32, a maximum rotation of 90° will cause the protrusions 23 to align with the notches 32b, allowing for easy alignment. Furthermore, when the inner diameter portion insertion portion 54 of the washer attachment tool 1 is passed through the inner diameter portion 21 of the washer 2 and the protrusions 23 are supported by the first cylindrical side portions 42b, a groove 54b1 is arranged in the inner diameter portion insertion portion 54 facing the peripheral edge of the inner diameter portion 21 of the washer 2. As a result, when the washer 2 is attached to the washer attachment tool 1, a part of the inner diameter portion 21 is inserted into the groove 54b1 and easily caught, making it difficult to move in the direction of the axis C2 relative to the inner diameter portion insertion portion 54.Even if the washer attachment tool 1 with the washer 2 attached is held so that the washer 2 faces downward, the washer 2 is unlikely to come off from the inner diameter portion insertion portion 54, making it easy to attach the washer 2 into the second recess 32.

[0031] Although specific embodiments have been described above, the present invention is not limited to those external appearances and configurations, and various modifications, additions, and deletions are possible within the scope of the present invention. For example, the following can be mentioned.

[0032] 1. In the above embodiment, the protrusions 23 of the washer 2 are arranged at 90° angular intervals around the axis C1, but this is not limited to this and the number of protrusions may be one. However, if the number of protrusions is reduced to one, or to two or three at equal angular intervals, the angle by which the washer attachment tool 1 is rotated in the second recess 32 increases, reducing workability.

[0033] 2. In the above embodiment, a groove 54b1 is provided in the inner diameter portion insertion portion 54 to facilitate temporary fixation of the washer 2, but this is not limiting. The inner diameter portion insertion portion 54 can also be formed from an elastically deformable material, and the washer 2 can be temporarily fixed by the elastic force that accompanies deformation of the inner diameter portion insertion portion 54. [Explanation of symbols]

[0034] 1 Washer installation tool 2 washers 3 Gear case 4 Main body 5 Sliding part 6 Spring 21 Inner diameter part 22 Outer diameter part 23 Convex part 32 Second recess (recess) 32a Cylindrical side 32b Notch 33 Bottom part 42 Large diameter section 42b First cylindrical side portion (first support portion) 42b1 End face 52 Temporary fixing part of washer 54 Inner diameter insertion part (shaft part) 54b groove (locking groove) 54b1 Outer diameter part 55b Second cylindrical side portion (second support portion) 55 Rotation stopper 55b3 Outer end surface C1 axis center C2 axis S1 Washer temporarily fixed S2 Washer temporarily released

Claims

1. A washer installation tool for installing a washer having an inner diameter portion and an outer diameter portion, the washer having a protrusion that protrudes radially by a certain distance from a part of the outer diameter portion and extends circumferentially, to an installation target, The mounting portion has a cylindrical recess having an inner diameter substantially equal to the outer diameter of the protrusion, and a cylindrical side portion formed by cutting out a portion of the cylindrical recess, the portion corresponding to the protrusion, in the direction of extension of the axis, from the bottom surface of the recess, the cylindrical side portion having an outer diameter equal to the diameter of the bottom surface and the axis of the recess, The washer installation tool includes a main body portion having a first support portion shaped to correspond to the notch portion, which is a portion of the cylinder other than the cylindrical side portion, and which abuts against and supports the protrusion portion of the washer in the axial direction; a sliding portion including a cylindrical axial rod portion that is slidable in the axial direction relative to the main body portion and is inserted into the inner diameter portion of the washer, and a second support portion that is coaxial with the axial rod portion and has a shape that corresponds to the cylindrical side portion; a spring that biases the sliding portion toward the tip of the shaft portion relative to the main body portion, When the second support portion is inserted into a portion of the washer supported by the main body portion other than the convex portion and the washer is prevented from rotating, the washer is abutted against the cylindrical side portion of the mounting portion and the main body portion is rotated around the axis while being pressed toward the bottom portion, and when the convex portion matches the cutout portion, the second support portion is pressed in the opposite direction to the bottom portion by the cylindrical side portion, causing the sliding portion to move in the opposite direction to the bottom portion against the spring force, and the washer is placed on the bottom portion of the recess.

2. 2. The washer attaching tool according to claim 1, wherein the protrusions are provided in a plurality at equal angular intervals around the axis of the washer.

3. 3. A washer installation tool according to claim 1 or claim 2, wherein when the axial rod portion is passed through the inner diameter portion of the washer and the protrusion is supported by the first support portion, the outer diameter portion of the axial rod portion is provided with an engaging groove whose width extending circumferentially is slightly larger than the plate thickness of the washer at the position where the inner diameter portion abuts.

Images