CN114173998A

CN114173998A - Tool for C-shaped check ring, tool component for C-shaped check ring and method for mounting C-shaped check ring

Info

Publication number: CN114173998A
Application number: CN201980098774.3A
Authority: CN
Inventors: 砚川政秀; 松本章二
Original assignee: Mitsubishi Electric Building Techno Service Co Ltd
Current assignee: Mitsubishi Electric Building Solutions Corp
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2022-03-11
Anticipated expiration: 2039-07-31
Also published as: WO2021019722A1; CN114173998B; JP6686238B1; JPWO2021019722A1

Abstract

Provided is a tool for a C-shaped retainer ring, which can smoothly mount the C-shaped retainer ring to a retainer ring groove and can suppress the mounting labor of the C-shaped retainer ring to the retainer ring groove. A tool (1) is provided with: a pair of arms (12a, 12b) including a pair of pins at the distal end side; a pair of handles (13a), (13 b); a connecting mechanism (14) for connecting the pair of arms (12a, 12b) and the pair of handles (13a, 13 b); and a retainer ring pressing unit having a protruding portion (30) protruding from the connecting mechanism (14) side toward the pin portion side, and a pressing portion (40) connected to an end portion of the protruding portion (30) on the side opposite to the connecting mechanism (14) side. The pressing part (40) comprises a support pressing surface, and when the pair of pin parts are inserted into the pair of tool insertion holes (78a, 78b), at least one part of the support pressing surface can contact with a part of the end surface of the C-shaped retaining ring (70) on the pin insertion side. The pair of pin portions can be inserted into the pair of tool insertion holes (78a, 78b) and can be held by a retainer ring that supports at least a part of the pressing surface in contact with a part of the end surface.

Description

Tool for C-shaped check ring, tool component for C-shaped check ring and method for mounting C-shaped check ring

Technical Field

The present disclosure relates to a tool for a C-shaped retainer ring. The present disclosure also relates to a tool member for a C-shaped retainer ring, which is attached to the clip pliers and constitutes a tool for a C-shaped retainer ring together with the clip pliers. The present disclosure also relates to a C-type retainer attaching method for attaching a C-type retainer to a retainer groove provided in a shaft portion.

Background

In an escalator, a drive unit generally rotates a drive side sprocket to circulate a step chain connected with steps between a drive side sprocket and a driven side sprocket, thereby circulating the steps. The handrail driving device transmits power from the driving-side sprocket to move the moving handrail in the same direction and at the same speed as the steps. In addition, when the steps are moved in a circulating manner, the drive rollers provided on both sides of the step plate of the step are caused to travel on the drive rail, and the driven rollers provided on both sides of the step plate are caused to travel on the driven rail, thereby achieving a desired posture of the steps. In an escalator, as described in patent document 1, a C-shaped retainer ring is disposed outside a drive roller and a driven roller of a roller mounting shaft portion to prevent the drive roller and the driven roller from coming off the roller mounting shaft portion.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009 and 221013

Disclosure of Invention

Problems to be solved by the invention

The drive roller and the driven roller deteriorated by wear and the like are replaced by the following method, for example. To describe the replacement of the drive roller as an example, first, the apron provided on the side of the steps is removed, or as shown in fig. 10, the floor of the landing located on the lower side of the escalator is removed, whereby the drive roller 80 is brought into a visually recognizable state. Thereafter, as shown in fig. 10, the mirror 89 is disposed outside the drive roller 80, and the outer surface of the drive roller 80 shown in fig. 11 can be visually confirmed through the mirror 89.

After the positions of the pair of

tool insertion holes

78a and 78b of the C-shaped retainer 70 disposed on the roller mounting shaft 81 are confirmed by the mirror 89, the hole insertion portions of the retainer pliers (not shown) are inserted into the

tool insertion holes

78a and 78 b.

Then, the space between the pair of

tool insertion holes

78a and 78b is expanded by the force from the clip pliers to expand the diameter of the C-shaped retainer ring 70. Then, the C-shaped retainer 70 after the diameter expansion is separated from the retainer groove provided in the roller mounting shaft 81, and thereafter, the C-shaped retainer 70 is pulled out from the roller mounting shaft 81 to the outside. Thus, the C-shaped retainer 70 is disengaged from the roller mounting shaft portion 81.

Next, the worn drive roller 80 is detached from the shaft portion, and a new drive roller 80 is fitted into the shaft portion. Next, the C-shaped retainer 70 is attached to the retainer groove of the roller attachment shaft portion 81 again. Specifically, the hole insertion portions of the clip pliers are inserted into the pair of

tool insertion holes

78a and 78b of the C-shaped retainer ring 70. Thereafter, as shown in fig. 10, the mirror 89 is disposed outside the drive roller 80, and the outer surface of the drive roller 80 shown in fig. 11 can be visually confirmed through the mirror 89.

Then, after the space between the pair of

tool insertion holes

78a and 78b is expanded by the force from the snap ring pliers to expand the diameter of the C-shaped retainer 70, the C-shaped retainer 70 after the expansion is arranged so as to substantially surround the roller mounting shaft portion 81. Then, while the hand is being held against the outer end surface of the C-shaped retainer 70, the C-shaped retainer 70 is moved inward in the axial direction of the roller mounting shaft 81 to move to the retainer groove. When the C-shaped retainer 70 is fitted into the retainer groove, the hole insertion portions of the clip pliers are disengaged from the pair of

tool insertion holes

78a and 78b, and the re-fitting of the C-shaped retainer 70 to the roller mounting shaft portion 81 is completed.

One elevator includes a plurality of steps, and sometimes a plurality of driving rollers 80 and driven rollers need to be replaced. In such a case, in this method, each time the C-shaped retainers 70 are to be attached, it is necessary to move the C-shaped retainers 70 inward in the axial direction of the roller attachment shaft 81 while holding the hand against the outer end faces of the C-shaped retainers 70 in a narrow working space, which requires a large amount of labor for attachment.

Therefore, an object of the present disclosure is to provide a tool for a C-type retainer, a tool member for a C-type retainer, and a method of attaching a C-type retainer, which can smoothly attach a C-type retainer to a retainer groove and can suppress labor for attaching a C-type retainer to a retainer groove.

Means for solving the problems

In order to solve the above problem, a C-type retainer tool according to the present disclosure is a C-type retainer tool for attaching a C-type retainer having a pair of tool insertion holes to a retainer groove provided in a shaft portion, the C-type retainer tool including: a pair of arms including a pair of pin portions on a distal end side, the pair of pin portions extending substantially in parallel and being inserted into the pair of tool through-holes; a pair of handles; a coupling mechanism that couples an end portion of the pair of arms on a side opposite to the pin portion and an end portion of the pair of handles on a side thereof so that a distance between the pair of pin portions varies when the distance between the pair of handles varies; and a retainer pressing unit having a protruding portion protruding from the connecting mechanism side toward the pin portion side and a pressing portion connected to an end portion of the protruding portion on a side opposite to the connecting mechanism side, wherein the pressing portion includes a support pressing surface at least a part of which is contactable with a part of an end surface of the C-type retainer on a pin insertion side when the pair of pin portions are inserted into the pair of tool through holes, and the C-type retainer can be held by the C-type retainer with the pair of pin portions inserted into the pair of tool through holes and at least a part of the support pressing surface being contactable with the part of the end surface.

Further, the requirement that the pair of pin portions can be made into a retainer retaining shape in which the pair of pin portions are inserted into the pair of tool insertion holes and at least a part of the pressing surface is supported to be in contact with a part of the pin insertion side end surface of the C-shaped retainer is satisfied when the requirement is satisfied in at least one C-shaped retainer existing in the world.

The tool for a C-type retainer according to the present disclosure may be configured as an integral tool that cannot be separated. Alternatively, the tool for a C-type retainer ring according to the present disclosure may be configured to include a main body and a member that is attachable to and detachable from the main body, and the member may be attached to the main body when in use.

According to the present disclosure, the pair of pin portions can be inserted into the pair of tool insertion holes and can be held by the retainer ring that supports at least a part of the pressing surface in contact with a part of the end surface. Therefore, by moving the pair of handles to increase the distance between the pair of pins in the retainer holding state, the C-shaped retainer can be expanded in diameter, and the expanded C-shaped retainer can be fitted to the outer peripheral side of the shaft portion.

Further, since a part of the C-shaped stopper is in contact with the support pressing surface in the stopper holding state, the posture of the C-shaped stopper can be stabilized by the support of the support pressing surface in the stopper holding state. In addition, after the C-shaped retainer is fitted into the shaft portion, when the tool for the C-shaped retainer is moved in the axial direction toward the retainer groove, the C-shaped retainer can be smoothly pushed out toward the retainer groove by the support pressing surface.

As a result, when the C-shaped retainer is moved on the outer peripheral side of the shaft portion, unlike the conventional art, it is not necessary to move the C-shaped retainer while holding the hand up, and the C-shaped retainer can be easily attached to the retainer groove. Therefore, the labor required for attaching the C-shaped retainer to the retainer groove can be reduced.

In the present disclosure, the pressing portion may have a side surface protruding from the support pressing surface, and the side surface may face an arc-shaped outer side surface of the C-shaped retainer in the retainer holding state.

Conventionally, when the C-shaped retainer is attached to or detached from the shaft portion, the C-shaped retainer needs to be expanded in diameter, but the degree of expansion of the C-shaped retainer at this time depends on the feeling of the maintenance worker. As a result, there is a possibility that the C-shaped retainer is excessively expanded and plastically deformed without a means for suppressing the plastic deformation due to the excessive expansion of the C-shaped retainer, and in such a case, a play is generated between the C-shaped retainer and the roller mounting shaft portion 81 at the time of re-mounting, and a sufficient roller drop prevention function of the C-shaped retainer may be lost.

In contrast, according to the present configuration, the side surface continuous with the support pressing surface faces the arcuate outer side surface of the C-shaped retainer in the retainer holding state. Therefore, by adjusting the position of the side surface to a position where the side surface contacts the C-shaped stopper before the C-shaped stopper is plastically deformed when the C-shaped stopper is expanded in diameter, the plastic deformation of the C-shaped stopper can be suppressed or prevented. Therefore, a sufficient roll drop prevention function of the C-shaped retainer ring at the time of remounting is easily ensured, and safety is easily lost.

In the present disclosure, the pressing portion may have an opposing surface that is connected to an end portion of the side surface opposite to the support pressing surface side and that faces the support pressing surface with a space therebetween, the support pressing surface, the side surface, and the opposing surface may define a groove, and a part of the C-shaped retainer may be sandwiched between the support pressing surface and the opposing surface in the retainer holding state.

When the C-shaped land is expanded in diameter, the C-shaped land becomes unstable (a state in which a force is applied to return to the original diameter). Therefore, in the conventional C-shaped stopper mounting, the C-shaped stopper is easily ejected from the clip pliers particularly in a state of being expanded in diameter, and it may take time and labor to search for the ejected C-shaped stopper.

In contrast, according to the present configuration, since a part of the C-shaped retainer is sandwiched between the support pressing surface and the opposing surface in the retainer holding state, the C-shaped retainer does not fly out of the tool for the C-shaped retainer. Therefore, the replacement of the drive roller and the driven roller can be performed quickly and efficiently. Further, since the diameter of the C-shaped retainer is expanded from a state in which a part of the C-shaped retainer is sandwiched between the support pressing surface and the opposing surface when the shaft portion is fitted, the degree of expansion of the C-shaped retainer is limited to a range in which the C-shaped retainer moves against static friction in the groove at most or a range in which the retainer pressing means can elastically deform, and there is no fear that the C-shaped retainer plastically deforms. Therefore, not only the C-shaped stopper can be prevented from flying out, but also the C-shaped stopper can be prevented from being plastically deformed, and a significant operational effect can be obtained.

Further, a tool member for a C-shaped retainer ring according to the present disclosure is attached to a clip pliers, the clip pliers including: a pair of arms including a pair of pin portions on a distal end side; and a block portion connected to an end portion of at least one of the arms on a side opposite to the pin side, the C-shaped retainer ring tool member including: a ring-shaped portion inserted from a distal end side of the pin so as to pass through the pin when attached to the clip pliers, and arranged to surround the block portion; a pressing portion including a support pressing surface, at least a portion of which is contactable with a portion of an end surface on an insertion side of the pin portion of the C-shaped retainer ring in a state where the pair of pin portions are inserted through the pair of tool insertion holes of the C-shaped retainer ring and the annular portion is arranged to surround the block portion; and a projecting portion that projects from one end portion in an extending direction of the annular portion and has a distal end portion connected to the pressing portion, wherein the C-shaped retaining ring tool member is capable of being brought into a retaining ring holding state in which at least a part of the support pressing surface is in contact with a part of the end surface when the pair of pin portions are inserted into the pair of tool insertion holes in a state in which the C-shaped retaining ring tool member is attached to the snap ring pliers.

According to the present disclosure, in a state where the tool member for the C-shaped retainer is attached to the block portion of the clip pliers, the pair of pin portions can be inserted into the pair of tool insertion holes and can be in a retainer holding state in which at least a part of the pressing surface is in contact with a part of the end surface. Therefore, similarly to the above-described tool for a C-type retainer, when moving the C-type retainer on the outer peripheral side of the shaft portion, unlike the conventional one, it is not necessary to move the C-type retainer while holding a hand up, and the C-type retainer can be easily attached to the retainer groove. Therefore, the labor required for attaching the C-shaped retainer to the retainer groove can be reduced.

According to the above configuration, the pressing portion has a side surface facing the arc-shaped outer side surface of the C-shaped retainer in the retainer holding state. Therefore, by adjusting the position of the side surface to a position where the side surface contacts the C-shaped stopper before the C-shaped stopper is plastically deformed when the C-shaped stopper is expanded in diameter, the plastic deformation of the C-shaped stopper can be suppressed or prevented. Therefore, a sufficient roll drop prevention function of the C-shaped retainer ring at the time of remounting is easily ensured, and safety is easily lost.

According to the above configuration, since a part of the C-shaped retainer is held between the pressing surface and the facing surface in the retainer holding state, the C-shaped retainer does not fly out of the tool for the C-shaped retainer. Therefore, the replacement of the drive roller and the driven roller can be performed quickly and efficiently. Further, since the diameter of the C-shaped land is expanded from a state in which a part of the C-shaped land is sandwiched between the bearing pressing surface and the opposing surface when the shaft portion is fitted, the degree of expansion of the C-shaped land is limited to a range in which the C-shaped land moves against static friction in the groove at most or a range in which the tool member for the C-shaped land can be elastically deformed, and there is no fear that the C-shaped land is plastically deformed. Therefore, not only the C-shaped stopper can be prevented from flying out, but also the C-shaped stopper can be prevented from being plastically deformed, and a significant operational effect can be obtained.

In the present disclosure, the annular portion may include a diameter-enlarged portion, and a cross-sectional area of the through hole of the diameter-enlarged portion, the cross-sectional area being perpendicular to the extending direction, may gradually increase toward a side opposite to the protruding portion in the extending direction.

The C-shaped retaining ring tool member is attached to the block portion so that the opposite side of the annular portion from the pin side covers the block portion. Here, according to the present configuration, since the enlarged diameter portion in which the cross-sectional area of the through-hole including the annular portion is gradually increased as the distance from the pin portion is increased, the enlarged diameter portion can be firmly fixed to all of the block portions having the cross-sectional size in the range between the maximum cross-sectional area and the minimum cross-sectional area of the enlarged diameter portion. Therefore, a wide range of clip pliers can be firmly attached to the tool member for the C-shaped retainer ring, and the tool member for the C-shaped retainer ring can be made excellent in versatility.

Further, a C-type retainer mounting method according to the present disclosure is a C-type retainer mounting method for mounting a C-type retainer to a retainer groove provided in a shaft portion using a C-type retainer tool that sandwiches a part of the C-type retainer with a support pressing surface and the opposing surface in a retainer holding state, the C-type retainer mounting method including: a retaining ring holding step of inserting the pair of pin portions of the C-shaped retaining ring tool into the pair of tool insertion holes and sandwiching a part of the C-shaped retaining ring by a support pressing surface and an opposing surface; a fitting step of, after the retainer holding step, fitting the C-shaped retainer to the outer peripheral surface of the shaft portion after moving the pair of handles so as to expand the distance between the pair of pins and thereby expanding the diameter of the C-shaped retainer; a retainer ring attaching step of, after the fitting step, moving the C-shaped retainer ring tool toward the retainer ring groove in the axial direction of the shaft portion until the C-shaped retainer ring is fitted into the retainer ring groove; and a tool removing step of removing the pair of pins from the pair of tool insertion holes after the retainer ring attaching step, and then separating the support pressing surface and the opposing surface from the C-shaped retainer ring.

According to the present disclosure, when the C-shaped retainer is moved on the outer peripheral side of the shaft portion, unlike the conventional art, it is not necessary to move the C-shaped retainer while holding a hand up, and the C-shaped retainer can be easily attached to the retainer groove. Therefore, the labor required for attaching the C-shaped retainer to the retainer groove can be reduced. In addition, not only can the C-shaped check ring be prevented from flying out, but also the plastic deformation of the C-shaped check ring can be prevented, and remarkable action and effect can be obtained.

Effects of the invention

According to the present disclosure, the C-shaped retainer ring can be smoothly attached to the retainer groove, and the labor for attaching the C-shaped retainer ring to the retainer groove can be suppressed.

Drawings

Fig. 1 is a perspective view of a known clip pliers constituting a main body of a C-shaped retainer ring tool according to an embodiment of the present disclosure.

Fig. 2 is a front view of a C-shaped retainer ring tool component of the C-shaped retainer ring tool.

Fig. 3 is a perspective view of the C-shaped retainer ring tool member as viewed from the direction indicated by the arrow a in fig. 2.

Fig. 4 is a front view of the C-type retainer tool in a state where the C-type retainer is held, as viewed from a side of the C-type retainer tool projecting from the pin portion in the thickness direction.

Fig. 5 is a rear view of the C-shaped retainer holding tool when viewed from the side opposite to the pin portion projecting side in the thickness direction.

Fig. 6 (a) is a schematic front view of the C-type retainer, and fig. 6 (B) is a B-direction view of the C-type retainer when viewed from the direction indicated by arrow B in fig. 6 (a). Fig. 6 (C) is a schematic side view of the roller mounting shaft portion provided with a retainer groove to which the C-shaped retainer is attached and detached.

Fig. 7 is a perspective view showing a state in which the C-shaped retainer held by the C-shaped retainer tool is brought close to the roller mounting shaft portion.

Fig. 8 is a perspective view of a C-shaped retainer ring tool member according to a modification corresponding to fig. 3.

Fig. 9 is a perspective view showing a modified example of the annular portion.

Fig. 10 is a perspective view showing a state in which a mirror is disposed outside the driving roller in order to insert the hole insertion portion of the snap ring holder into the tool insertion hole of the C-shaped retainer ring.

Fig. 11 is a perspective view of a drive roller falling-off prevention structure including a roller mounting shaft portion, a drive roller, and a C-shaped retainer ring.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, when a plurality of embodiments, modifications, and the like are included below, it is initially assumed that a new embodiment is constructed by appropriately combining these features. In the following embodiments, the same components are denoted by the same reference numerals in the drawings, and redundant description thereof is omitted. In addition, the drawings include schematic drawings, and the dimensional ratios of the members such as the vertical, horizontal, and height are not necessarily uniform between different drawings. Among the constituent elements described below, those not recited in the independent claims indicating the uppermost concept are arbitrary constituent elements and are not essential constituent elements. In the present specification, when a term "substantially" is used, the term "substantially" is used in the same sense as the term "substantially" and the requirement of "substantially" is satisfied when a human body looks like it.

Fig. 1 is a perspective view of a known clip pliers 10 constituting a main body of a C-shaped retainer ring tool according to an embodiment of the present disclosure. Fig. 2 is a front view of the C-type retainer tool member 20 of the C-type retainer tool, and fig. 3 is a perspective view of the C-type retainer tool member 20 as viewed from the direction indicated by the arrow a in fig. 2.

The tool for a C-type retainer (hereinafter simply referred to as a tool) includes a clip pliers 10 shown in fig. 1 and a tool member for a C-type retainer (hereinafter simply referred to as a tool member) 20 shown in fig. 2 and 3. As shown in fig. 1, the clip pliers 10 includes a pair of first and

second arms

12a and 12b, a pair of first and

second handles

13a and 13b, and a coupling mechanism 14. The first arm 12a has a first pin portion 11a on the distal end side, and the second arm 12b has a second pin portion 11b on the distal end side. The coupling mechanism 14 couples one end of the pair of

arms

12a and 12b opposite to the

pin portions

11a and 11b to one end of the pair of

handles

13a and 13b so that the distance between the pair of

pin portions

11a and 11b varies when the distance between the pair of

handles

13a and 13b varies.

Specifically, the connecting mechanism 14 includes, for example, a first flat plate 15a, a second flat plate 15b, and a pin 19. A part of the first flat plate 15a in the extending direction protrudes to one side in the width direction, and the width of the part is larger than the width of the other part. Further, a part of the second flat plate portion 15b in the extending direction protrudes to the other side in the width direction, and the width of the part is larger than the width of the other part. The wide portions of the first flat plate 15a and the second flat plate 15b overlap each other in the thickness direction. The pin 19 extends in the thickness direction so as to penetrate the overlapping wide portions. The first flat plate portion 15a and the second flat plate portion 15b are rotatable about the pin 19.

A portion of the first flat plate portion 15a on the first handle 13a side is elongated, and a distal end portion of the elongated portion 16a is connected to the first handle 13 a. Further, the second flat plate portion 15b is also elongated on the second handle 13b side, and the distal end portion of the elongated portion 16b is connected to the second handle 13 b. The elongated portion 16a and the elongated portion 16b are joined by a coil spring 18. In a state where a person does not apply a force to the

handles

13a and 13b, the pair of

handles

13a and 13b are opened by the biasing force of the coil spring 18.

Each of the

flat plate portions

15a and 15b has

block portions

17a and 17b including substantially prism-shaped portions on the first and

second arms

12a and 12b sides. The first arm 12a is connected to the first block portion 17a of the first flat plate portion 15a, and the second arm 12b is connected to the second block portion 17b of the second flat plate portion 15 b. The first arm 12a, the first flat plate 15a, and the first handle 13a may be integrally formed, and the second arm 12b, the second flat plate 15b, and the second handle 13b may be integrally formed.

The first arm 12a on one side in the width direction of the clip pliers 10 is connected to the first handle 13a on one side in the width direction via a first flat plate portion 15a, and the second arm 12b on the other side in the width direction of the clip pliers 10 is connected to the second handle 13b on the other side in the width direction via a second flat plate portion 15 b.

The first pin 11a protrudes from the distal end portion of the first arm 12a in the thickness direction of the tool 1, and the second pin 11b protrudes from the distal end portion of the second arm 12b in the thickness direction. When a person grips the

handles

13a, 13b to decrease the distance between the

handles

13a, 13b, the distance between the first arm 12a and the second arm 12b becomes larger. Further, as the snap ring pliers, any snap ring pliers having a block portion (block body portion) connected to at least one arm side may be used, and any known snap ring pliers may be used. For example, the clip pliers are not limited to the configuration shown in fig. 1, and when a person grips the handles and the distance between the handles is reduced, the distance between the first arm and the second arm may be reduced.

Next, the structure of the tool member 20 will be explained. The tool member 20 is integrally formed of a hard material such as metal. As shown in fig. 2 and 3, the tool member 20 includes an annular portion 21, a protruding portion 30, and a pressing portion 40. Both sides of the annular portion 21 in the axial direction are open in the axial direction. In the present embodiment, the annular portion 21 is formed of 4 first to fourth flat plate portions 22a to 22d, and defines a substantially rectangular parallelepiped space. The protruding portion 30 protrudes from one axial edge 22e of the first flat plate 22a to one axial region.

In fig. 2 and 3, the Z direction is the axial direction of the annular portion 21, and the X direction is the normal direction of the first flat plate portion 22a to which the protruding portion 30 is connected among the 4 first to fourth flat plate portions 22a to 22 d. The Y direction is an extending direction of one axial edge of the first flat plate 22 a. The X direction, the Y direction and the Z direction are perpendicular to each other.

As shown in fig. 3, the projection 30 includes an axial extension 31 and an inclined extension 32. The axially extending portion 31 protrudes from one side edge portion 22e of the first flat plate portion 22a to substantially one side in the Z direction. As shown in fig. 2, the axially extending portion 31 may have a rib 31a formed by bending both sides in the width direction, and the rib 31a may extend in the extending direction of the axially extending portion 31. By forming the rib 31a, the periphery of the connection portion between the annular portion 21 and the protruding portion 30, which is easily weakened in strength, can be reinforced, and the rigidity of the tool member 20 can be increased.

Referring to fig. 3, the existing position of the inclined extension portion 32 moves to the X direction side and the Y direction side as going from the end portion of the axial extension portion 31 on the opposite side to the annular portion 21 side to the side away from the annular portion 21 in the Z direction. The inclined extension portion 32 extends toward one side in the X direction until an end portion 33 on the opposite side to the axially extending portion 31 side is positioned on the opposite side to the first flat plate portion 22a side in the X direction from the second flat plate portion 22b facing the first flat plate portion 22a in the annular portion 21. As shown in fig. 2, the end 33 of the inclined extension portion 32 is not located on a plane P that bisects the first flat plate portion 22a in a plane-symmetric manner and includes the Z direction, but is located in a region on one side of the plane P and on the Y direction side of the plane P.

As shown in fig. 3, the pressing portion 40 protrudes from the end portion 33 of the inclined extension portion 32 to one side in the Z direction. As shown in fig. 2, the pressing portion 40 includes a supporting pressing surface 41, a side surface 50, and an opposing surface 60. The supporting and pressing surface 41 is included in a first arc-shaped flat plate 42, the first arc-shaped flat plate 42 being a flat plate having a substantially arc shape when viewed from the front, and the opposing surface 60 is included in a second arc-shaped flat plate 43, the second arc-shaped flat plate 43 being a flat plate having a substantially arc shape when viewed from the front. The first circular arc flat plate 42 and the second circular arc flat plate 43 have substantially the same circular arc front shape and are arranged substantially in parallel with a slight gap therebetween. The supporting and pressing surface 41 forms a surface of the first arcuate flat plate 42 on the side of the second arcuate flat plate 43, and the opposing surface 60 forms a surface of the second arcuate flat plate 43 on the side of the first arcuate flat plate 42.

As shown in fig. 2, the first arc-shaped flat plate 42 and the second arc-shaped flat plate 43 each have an arc-shaped edge portion on the other side in the Y direction. The pressing portion 40 includes a connecting flat plate portion 51 extending in a direction substantially normal to the first arcuate flat plate 42, and the connecting flat plate portion 51 connects an edge portion of the first arcuate flat plate 42 on a side opposite to the arcuate edge portion side and an edge portion of the second arcuate flat plate 43 on a side opposite to the arcuate edge portion side. As shown in fig. 2, the first arcuate flat plate 42, the second arcuate flat plate 43, and the connecting flat plate portion 51 define a groove 55 that opens toward the other side in the Y direction.

More specifically, side surface 50 constitutes a surface on the groove 55 side of coupling plate portion 51, and constitutes a bottom surface of groove 55. The supporting and pressing surface 41, the facing surface 60, and the side surface 50 cooperate with each other to define a groove 55. The end portion of the protrusion 30 on the opposite side to the annular portion 21 side in the Z direction is connected to the end portion of the first arcuate flat plate 42 on the annular portion 21 side in the Z direction. Further, the one end portion of the projection may be connected to both the first arcuate flat plate and the second arcuate flat plate so as to extend across the first arcuate flat plate and the second arcuate flat plate, instead of being connected to only the first arcuate flat plate.

Next, an operation of attaching the tool member 20 to the snap ring pliers 10 will be described, and an operation of attaching the C-shaped retainer ring in the tool 1 including the snap ring pliers 10 and the tool member 20 will be described. Fig. 4 is a front view of the tool 1 in a state where the C-shaped retainer 70 is held, as viewed from a side of the pin portion projecting in the thickness direction, and fig. 5 is a rear view of the tool 1 in a state where the C-shaped retainer 70 is held, as viewed from the opposite side in the thickness direction.

As shown in fig. 1, the first pin portion 11a projects from the distal end portion of the first arm 12a toward one side region in the thickness direction of the tool 1, and the second pin portion 11b projects from the distal end portion of the second arm 12b toward one side region in the thickness direction of the tool 1. As shown in fig. 4, the tool member 20 is attached to the ring clamp 10 by inserting the annular portion 21 from the opening on the opposite side to the protruding portion 30 side so as to surround one of the first pin portions 11a (see fig. 1), and thereafter press-fitting and fixing the annular portion 21 to the first block portion 17a (see fig. 1) connected to the first arm 12a including the first pin portion 11 a. The tool part 20 constitutes a retainer ring pressing unit in the tool 1.

As shown in fig. 4, the annular portion 21 is attached so that the second flat plate portion 22b comes into contact with the surface of the first block portion 17a on the pin portion projecting side in the thickness direction. As described above, in the tool 1, the existing position of the inclined extension portion 32 moves to the X direction side (the thickness direction side of the tool 1) and the Y direction side (the width direction side of the tool 1) as going from the end portion of the axial extension portion 31 on the side opposite to the annular portion 21 to the side away from the annular portion 21 in the Z direction.

As a result, in the tool 1, as shown in fig. 4, the retainer ring can be held in the following manner: the pair of

pin portions

11a, 11b are inserted into the pair of

tool insertion holes

78a, 78b of the C-shaped retainer 70, and the tool member (retainer pressing means) 20 is positioned at a position spaced apart from the

arms

12a, 12b, and at least a part of the support pressing surface 41 is in contact with a part of one side end surface in the thickness direction of the C-shaped retainer 70. In the present embodiment, the side surface 50 (see fig. 2) faces the arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state. In the retainer holding state, a part of the C-shaped retainer 70 is sandwiched between the support pressing surface 41 and the opposing surface 60 (see fig. 2), and the C-shaped retainer 70 is locked to the pressing portion 40.

Next, the operation of attaching the shaft portion of the C-shaped retainer 70 to the retainer groove using the tool 1 will be described. First, the structures of the C-shaped retainer 70, the roller mounting shaft 81, and the retainer groove 77 provided in the roller mounting shaft 81 will be briefly described. Fig. 6 (a) is a schematic front view of the C-shaped retainer ring 70, and fig. 6 (B) is a B-direction view of the C-shaped retainer ring 70 when viewed from the direction indicated by the arrow B in fig. 6 (a). Fig. 6 (C) is a schematic side view showing the roller mounting shaft 81 provided with the retainer groove 77 to which the C-shaped retainer 70 is attached and detached.

The tool 1 is used for attaching and detaching the C-shaped retainer 70 shown in fig. 6 (a) and (b) to and from the retainer groove 77 of the roller mounting shaft 81 as an example of the shaft shown in fig. 6 (C). As shown in fig. 6 (a), the C-shaped retainer ring 70 has a gap 71. The C-shaped retainer ring 70 has a pair of

tool insertion holes

78a and 78b provided at both ends thereof so as to sandwich the gap 71. Referring to fig. 6 (c), the retainer groove 77 is provided on the cylindrical outer peripheral surface of the roller mounting shaft 81 over the entire circumference.

Next, the procedure for attaching the C-shaped retainer 70 to the retainer groove 77 will be described. First, the above-described retaining ring holding state is realized. Specifically, the pair of

pin portions

11a and 11b of the tool 1 are inserted into the pair of

tool insertion holes

78a and 78b, and a part of the C-shaped retainer ring 70 is sandwiched between the support pressing surface 41 and the opposing surface 60.

Next, as described in the conventional example, the C-shaped retainer 70 held by the tool 1 is brought close to the roller mounting shaft 81 as shown in fig. 7 while using the mirror 89. Then, the pair of

grips

13a and 13b (see fig. 1) are gripped so that the distance between the pair of

pin portions

11a and 11b is increased, and after the C-shaped retainer 70 is expanded in diameter, the C-shaped retainer 70 is fitted to the outer peripheral surface of the roller mounting shaft portion 81.

Then, the tool 1 is moved toward the retainer groove 77 side in the axial direction of the roller mounting shaft portion 81 until the C-shaped retainer 70 is fitted into the retainer groove 77. When the C-shaped retainer 70 is fitted into the retainer groove 77, the tool 1 is moved toward the end surface 97 of the roller mounting shaft 81 in the axial direction so as to be separated from the retainer groove 77, and the pair of

pin portions

11a and 11b are pulled out from the pair of

tool insertion holes

78a and 78 b. Thereafter, the tool 1 is moved in a direction in which the pressing portion 40 moves outward in the radial direction of the roller mounting shaft portion 81, whereby the support pressing surface 41 (see fig. 2) and the opposing surface 60 (see fig. 2) are disengaged from the C-shaped retainer ring 70. When the pressing surface 41 and the counter surface 60 are supported and separated from the C-shaped retainer 70, and the tool 1 is in a state of being separated from the C-shaped retainer 70, the mounting of the C-shaped retainer 70 to the retainer groove 77 by the tool 1 is completed.

As described above, the tool 1 is used to attach the C-shaped retainer 70 having the pair of

tool insertion holes

78a and 78b to the retainer groove 77 provided in the roller attachment shaft portion 81. Further, the tool 1 includes: a pair of

arms

12a, 12b including, on distal end sides, a pair of

pin portions

11a, 11b extending substantially in parallel and inserted into the pair of tool through-

holes

78a, 78 b; and a pair of

handles

13a, 13 b. The tool 1 further includes a coupling mechanism 14, and the coupling mechanism 14 couples the end portions of the pair of

arms

12a and 12b on the opposite side to the

pin portions

11a and 11b and the end portions of the pair of

handles

13a and 13b on the one side so that the distance between the pair of

pin portions

11a and 11b varies when the distance between the pair of

handles

13a and 13b varies. Further, the tool 1 includes a retainer ring pressing unit including: a protrusion 30 protruding from the connecting mechanism 14 side toward the

pin portions

11a and 11 b; and a pressing portion 40 connected to an end portion of the protruding portion 30 on the opposite side to the connecting mechanism 14 side. In the tool 1, the pressing portion 40 includes the support and pressing surface 41, and when the pair of

pin portions

11a and 11b are inserted into the pair of

tool insertion holes

78a and 78b, at least a part of the support and pressing surface 41 can be brought into contact with a part of the pin insertion side end surface 88 (see fig. 5) of the C-shaped retainer 70, and a retainer holding state can be established in which the pair of

pin portions

11a and 11b are inserted into the pair of

tool insertion holes

78a and 78b and at least a part of the support and pressing surface 41 is brought into contact with a part of the end surface 88.

According to the present disclosure, the pair of

pin portions

11a and 11b can be inserted into the pair of

tool insertion holes

78a and 78b, and can be in the retainer retaining state in which at least a part of the pressing surface 41 is supported in contact with a part of the end surface 88. Therefore, by moving the pair of

handles

13a and 13b so as to increase the distance between the pair of

pins

11a and 11b in the retainer holding state, the C-shaped retainer 70 can be expanded in diameter, and the C-shaped retainer 70 after the diameter expansion can be fitted to the outer peripheral side of the roller mounting shaft 81.

Further, since a part of the C-shaped retainer 70 is in contact with the support pressing surface 41 in the retainer holding state, the posture of the C-shaped retainer 70 can be stabilized by the support of the support pressing surface 41 in the retainer holding state. In addition, even when the tool 1 is moved in the axial direction toward the retainer groove 77 after the C-shaped retainer 70 is fitted into the roller mounting shaft 81, the C-shaped retainer can be smoothly pushed out toward the retainer groove by the support pressing surface 41.

As a result, when the C-shaped retainer 70 is moved on the outer peripheral side of the roller mounting shaft 81, unlike the conventional art, it is not necessary to move the C-shaped retainer 70 while holding the hand up, and the C-shaped retainer 70 can be easily mounted to the retainer groove 77. Therefore, the labor required for attaching the C-shaped retainer 70 to the retainer groove 77 can be reduced.

In the tool 1, the pressing portion 40 may have a side surface 50 protruding from the support pressing surface 41, and the side surface 50 may face an arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state.

Conventionally, when the C-shaped retainer 70 is attached to or detached from the roller attachment shaft 81, the C-shaped retainer 70 needs to be expanded in diameter, but the degree of expansion of the C-shaped retainer 70 at this time depends on the feeling of the maintenance worker. As a result, in the case where there is no means for suppressing the C-shaped retainer 70 from being excessively expanded and plastically deformed as in the known snap ring pliers, there is a possibility that the C-shaped retainer 70 is excessively expanded and plastically deformed, and in such a case, when the C-shaped retainer 70 is mounted again, a play is generated between the C-shaped retainer 70 and the roller mounting shaft portion 81, and there is a possibility that the sufficient roller drop prevention function of the C-shaped retainer 70 is lost.

In contrast, according to the present configuration, the side surface 50 continuous with the support pressing surface 41 faces the arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state. Therefore, by adjusting the position of the side surface 50 to a position that contacts the C-shaped retainer ring 70 before the C-shaped retainer ring 70 is plastically deformed when the C-shaped retainer ring 70 is expanded in diameter, the plastic deformation of the C-shaped retainer ring 70 can be suppressed or prevented. Therefore, a sufficient roll drop prevention function of the C-shaped retainer 70 at the time of remounting is easily ensured, and safety is easily lost.

In the tool 1, the pressing portion 40 may have an opposing surface 60, the opposing surface 60 being connected to an end portion of the side surface 50 opposite to the side supporting the pressing surface 41 and opposing the supporting and pressing surface 41 with a gap therebetween, and the supporting and pressing surface 41, the side surface 50, and the opposing surface 60 defining the groove 55. In the retainer holding state, a part of the C-shaped retainer 70 may be sandwiched between the support pressing surface 41 and the opposing surface 60.

When the C-shaped retainer 70 is expanded in diameter, the C-shaped retainer 70 is in an unstable state (a state in which a force is applied to return to its original diameter). Therefore, in the conventional installation of the C-shaped retainer 70, the C-shaped retainer 70 is easily ejected from the clip pliers particularly in a state of being expanded in diameter, and it may take time and labor to search for the ejected C-shaped retainer 70.

In contrast, according to the present configuration, in the retainer holding state, since a part of the C-shaped retainer 70 is sandwiched between the support pressing surface 41 and the opposing surface 60, the C-shaped retainer 70 does not fly out of the tool 1. Therefore, the replacement of the drive roller 80 and the driven roller of the passenger conveyor, for example, an escalator or a moving sidewalk can be performed quickly and efficiently. Further, since the diameter of the C-shaped retainer 70 is expanded from a state in which a part of the C-shaped retainer 70 is already sandwiched between the support pressing surface 41 and the facing surface 60 when the roller mounting shaft 81 is fitted, the degree of expansion of the C-shaped retainer 70 is limited to a range in which the C-shaped retainer 70 moves against static friction in the groove 55 at most or a range in which the retainer pressing means can elastically deform, and there is no fear that the C-shaped retainer 70 is plastically deformed. Therefore, not only the C-shaped retainer 70 can be prevented from flying out, but also the C-shaped retainer 70 can be prevented from being plastically deformed, and a significant operational effect can be obtained.

Further, the tool part 20 is mounted to the snap ring pliers 10, the snap ring pliers 10 comprising: a pair of

arms

12a, 12b including a pair of

pin portions

11a, 11b on a distal end side; and

block portions

17a, 17b connected to an end portion of at least one of the

arms

12a, 12b on the side opposite to the

pins

11a, 11 b. The tool member 20 includes a ring portion 21, and the ring portion 21 is inserted from the distal end side of the

pins

11a and 11b so as to pass through the

pins

11a and 11b when being attached to the clip pliers 10, and is disposed so as to surround the block portion 17 a. The tool member 20 includes a pressing portion 40, the pressing portion 40 includes a supporting and pressing surface 41, and at least a part of the supporting and pressing surface 41 is contactable with a part of the insertion-side end surface 88 of the

pin portions

11a and 11b of the C-shaped retainer 70 in a state where the pair of

pin portions

11a and 11b are inserted into the pair of

tool insertion holes

78a and 78b of the C-shaped retainer 70 and the annular portion 21 is arranged so as to surround the block portion 17 a. The tool member 20 further includes a protruding portion 30, and the protruding portion 30 protrudes from one end portion in the extending direction of the annular portion 21 and has a distal end portion connected to the pressing portion 40. In addition, when the pair of

pin portions

11a and 11b are inserted into the pair of

tool insertion holes

78a and 78b in a state where the tool member 20 is attached to the snap ring pliers 10, a snap ring holding state can be achieved in which at least a part of the pressing surface 41 is supported in contact with a part of the end surface 88.

According to the present disclosure, in a state where the tool member 20 is attached to the block portion 17a of the snap ring pliers 10, the pair of

pin portions

11a and 11b can be inserted into the pair of

tool insertion holes

78a and 78b, and can be in a snap ring holding state where at least a part of the pressing surface 41 is supported in contact with a part of the end surface 88. Therefore, as in the case of the tool 1 described above, when the C-shaped retainer 70 is moved on the outer peripheral side of the roller mounting shaft 81, unlike the conventional art, it is not necessary to move the C-shaped retainer 70 while holding a hand up, and the C-shaped retainer 70 can be easily mounted to the retainer groove 77. Therefore, the labor required for attaching the C-shaped retainer 70 to the retainer groove 77 can be reduced.

In the tool member 20 of the present disclosure, the pressing portion 40 may have a side surface 50 protruding from the support pressing surface 41, and the side surface 50 may face an arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state.

According to this configuration, the pressing portion 40 has a side surface facing the arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state. Therefore, by adjusting the position of the side surface 50 to a position that contacts the C-shaped retainer ring 70 before the C-shaped retainer ring 70 is plastically deformed when the C-shaped retainer ring 70 is expanded in diameter, the plastic deformation of the C-shaped retainer ring 70 can be suppressed or prevented. Therefore, a sufficient roll drop prevention function of the C-shaped retainer 70 at the time of remounting is easily ensured, and safety is easily lost.

In the tool member 20 of the present disclosure, the pressing portion 40 may have an opposing surface 60, the opposing surface 60 being connected to an end portion of the side surface 50 opposite to the side of the supporting and pressing surface 41 and opposing the supporting and pressing surface 41 with a gap therebetween, the supporting and pressing surface 41, the side surface 50, and the opposing surface 60 defining the groove 55, and a part of the C-shaped retainer 70 may be sandwiched between the supporting and pressing surface 41 and the opposing surface 60 in the retainer holding state.

According to the above configuration, in the retainer holding state, since a part of the C-shaped retainer 70 is sandwiched between the support pressing surface 41 and the opposing surface 60, the C-shaped retainer 70 does not fly out of the tool 1. Therefore, the replacement of the drive roller 80 and the driven roller can be performed quickly and efficiently. Further, since the diameter of the C-shaped retainer 70 is expanded from a state in which a part of the C-shaped retainer 70 is already sandwiched between the support pressing surface 41 and the opposing surface 60 when the roller mounting shaft 81 is fitted, the degree of expansion of the C-shaped retainer 70 is limited to a range in which the C-shaped retainer 70 moves against static friction in the groove 55 at most or a range in which the tool member 20 can be elastically deformed, and there is no fear that the C-shaped retainer 70 is plastically deformed. Therefore, not only the C-shaped retainer 70 can be prevented from flying out, but also the C-shaped retainer 70 can be prevented from being plastically deformed, and a significant operational effect can be obtained.

The C-type retainer attaching method according to the present disclosure is used when the C-type retainer 70 is attached to the retainer groove 77 provided in the roller attaching shaft portion 81 by using the tool 1 according to the embodiment of the present disclosure, and the tool 1 sandwiches a part of the C-type retainer 70 between the support pressing surface 41 and the facing surface 60 in the retainer holding state. In addition, the C-shaped check ring installation method comprises the following check ring holding steps: the pair of

pin portions

11a and 11b of the tool 1 are inserted into the pair of

tool insertion holes

78a and 78b, and a part of the C-shaped retainer ring 70 is sandwiched between the support pressing surface 41 and the opposing surface 60. The method for attaching the C-shaped retainer ring includes the following fitting steps: after the retainer holding step, the pair of

handles

13a and 13b are moved so as to increase the distance between the pair of

pins

11a and 11b, thereby expanding the diameter of the C-shaped retainer 70, and then the C-shaped retainer 70 is fitted to the outer peripheral surface of the roller mounting shaft 81. In addition, the C-shaped check ring installation method comprises the following steps: a retainer ring attaching step of, after the fitting step, moving the tool 1 toward the retainer ring groove 77 side in the axial direction of the roller attaching shaft portion 81 until the C-shaped retainer ring 70 is fitted into the retainer ring groove 77; and a tool removing step of removing the pair of

pins

11a and 11b from the pair of

tool insertion holes

78a and 78b after the retainer ring attaching step, and then separating the support pressing surface 41 and the opposing surface 60 from the C-shaped retainer ring 70.

According to the present disclosure, when the C-shaped retainer 70 is moved on the outer peripheral side of the roller mounting shaft 81, unlike the conventional art, it is not necessary to move the C-shaped retainer 70 while holding a hand up, and the C-shaped retainer 70 can be easily mounted to the retainer groove. Therefore, the labor required for attaching the C-shaped retainer 70 to the retainer groove 77 can be reduced. In addition, not only the C-shaped retainer ring 70 can be prevented from flying out, but also the C-shaped retainer ring 70 can be prevented from being plastically deformed, and a significant operational effect can be obtained.

The present disclosure is not limited to the above-described embodiments and modifications thereof, and various improvements and modifications can be made within the scope of the matters recited in the claims of the present application and their equivalents.

For example, in the above embodiment, the following case is explained: in the tool 1 and the tool member 20, the pressing portion 40 has a side surface 50 protruding from the support pressing surface 41, and the side surface 50 faces the arc-shaped outer side surface of the C-shaped retainer 70 in the retainer holding state. In addition, the following is explained: in the tool 1 and the tool member 20, the pressing portion 40 has the facing surface 60, the facing surface 60 is connected to an end portion of the side surface 50 opposite to the side of the supporting and pressing surface 41 and faces the supporting and pressing surface 41 with a space therebetween, the supporting and pressing surface 41, the side surface 50, and the facing surface 60 define the groove 55, and a part of the C-shaped retainer 70 is sandwiched between the supporting and pressing surface 41 and the facing surface 60 in the retainer holding state. However, the pressing portion of the tool or the tool member may have a supporting pressing surface and a side surface, and may not have an opposing surface. Alternatively, the pressing portion of the tool or the tool member may have a supporting pressing surface, and not both the side surface and the facing surface.

In the tool 1, the retainer ring can be held as follows: the pair of

pin portions

11a, 11b are inserted into the pair of

tool insertion holes

arms

12a, 12b, and at least a part of the support pressing surface 41 is in contact with a part of one side end surface in the thickness direction of the C-shaped retainer 70. However, in the retainer holding state, the retainer pressing means (tool member) may not be located at a position spaced apart from the arm, and at least a part of the retainer pressing means (tool member) may be in contact with at least a part of the arm.

This is because the retainer ring pressing unit can be slightly elastically deformed. In particular, when the tool member 20 is attached to the snap ring pliers 10, the tool member 20 can move slightly relative to the snap ring pliers 10. Further, the retainer pressing means (tool member) may contact the arm so as to overlap the arm in the thickness direction of the tool. Therefore, in the retainer holding state, even if at least a part of the retainer pressing means (tool member) is in contact with at least a part of the arm, the arm may be relatively movable with respect to the retainer pressing means (tool member), and the diameter expanding operation may be performed. However, in the retainer holding state, it is preferable that the retainer pressing means (tool member) is located at a position spaced apart from the arm, since the diameter expansion operation is facilitated.

The case where the retainer pressing means (tool member 20) has the inclined extension portion 32 that moves to one side in the X direction and one side in the Y direction as going to the side away from the annular portion 21 in the Z direction has been described. However, the retainer ring pressing unit (tool member) may not have such an inclined extension portion. As shown in fig. 3, the case where the pressing portion 40 extends substantially parallel to the YZ plane has been described. However, as shown in fig. 8, which is a perspective view of the tool member 120 of the modification corresponding to fig. 3, the pressing portion 140 of the tool member 120 may be extended in a plane direction inclined with respect to the YZ plane. In short, the tool of the present disclosure may be in a retainer retaining state in which the pair of pin portions are inserted into the pair of tool insertion holes and at least a part of the support pressing surface is in contact with a part of the pin insertion side end surface of the C-shaped retainer.

The case where the annular portion 21 has a shape defining a substantially rectangular parallelepiped space has been described. However, the annular portion may include a diameter-enlarged portion whose cross-sectional area perpendicular to the extending direction of the through-hole gradually increases toward the side opposite to the protruding portion in the extending direction.

For example, as in the annular portion 221 of the modification example shown in the perspective view in fig. 9 (a), the through-hole 222 may have a quadrangular frustum shape, and the cross-sectional area of the through-hole 222 may gradually increase toward the opposite side of the pressing portion in the axial direction of the through-hole 222. Alternatively, as in the annular portion 321 of the modification example shown in the perspective view in fig. 9 (c), the through-hole 322 may have a truncated cone shape, and the cross-sectional area of the through-hole 322 may gradually increase toward the opposite side of the pressing portion in the axial direction of the through-hole 322.

The tool member is attached to the block portion so that the side of the annular portion opposite to the pin side covers the block portion. Here, according to the present modification, since the

annular portions

221, 321 include the

enlarged diameter portions

225, 325 in which the cross-sectional area of the through-

holes

222, 322 gradually increases with distance from the pin portion, all the block portions having a cross-sectional area in a range between the maximum cross-sectional area and the minimum cross-sectional area of the

enlarged diameter portions

225, 325 can be firmly fixed to the

enlarged diameter portions

225, 325. Therefore, the clamp ring pliers in a wide range can be firmly attached to the tool member, and the tool member can be made excellent in versatility.

In addition, the case where the tool member 20 is attachable to and detachable from the snap ring pliers 10 has been described. However, the tool member 20 may be permanently fixed to the snap ring clamp 10 using welding, an adhesive, or the like. Alternatively, in the tool of the present disclosure, the coupling mechanism and the retainer pressing unit may be integrally formed, or may be formed without using a tool member. When the tool member 20 is permanently fixed to the snap ring pliers 10 by welding, an adhesive, or the like, or when the coupling mechanism is integrated with the retainer ring pressing means, the retainer ring pressing means moves relatively only within a range in which it can elastically deform with respect to the arm, and does not move substantially or relatively. Therefore, the operability of the tool is improved, and the C-shaped retainer is easily attached to the retainer groove.

Description of the reference symbols

1: a tool; 10: a snap ring clamp; 11 a: a first pin portion; 11 b: a second pin portion; 12 a: a first arm; 12 b: a second arm; 13 a: a first handle; 13 b: a second handle; 14: a connecting mechanism; 17 a: a first block portion; 17 b: a second block section; 20. 120: a tool component; 21. 221, 321: an annular portion; 30: a protrusion; 40. 140: a pressing part; 41: supporting the pressing surface; 50: a side surface; 55: a groove; 60: opposite surfaces; 70: a C-shaped retainer ring; 77: a retainer groove; 78a, 78 b: a tool through hole; 80: a drive roller; 81: a roller mounting shaft portion; 88: the end face of the pin insertion side of the C-shaped retainer ring; 222. 322: a through hole; 225: an expanding portion.

Claims

1. A tool for a C-type retainer for attaching a C-type retainer having a pair of tool insertion holes to a retainer groove provided in a shaft portion, the tool comprising:

a pair of arms including a pair of pin portions on a distal end side, the pair of pin portions extending substantially in parallel and being inserted into the pair of tool through-holes;

a pair of handles;

a coupling mechanism that couples an end portion of the pair of arms on a side opposite to the pin portion and an end portion of the pair of handles on a side thereof so that a distance between the pair of pin portions varies when the distance between the pair of handles varies; and

a retainer ring pressing unit having a projecting portion projecting from the connecting mechanism side toward the pin portion side and a pressing portion connected to an end portion of the projecting portion on a side opposite to the connecting mechanism side,

the pressing portion includes a support and pressing surface at least a part of which is contactable with a part of an end surface of the C-shaped retainer ring on a pin insertion side when the pair of pin portions are inserted into the pair of tool insertion holes,

the C-shaped retainer tool can be in a retainer holding state in which the pair of pin portions are inserted into the pair of tool insertion holes and at least a part of the support and pressing surface is in contact with a part of the end surface.

2. The tool for C-shaped retainer ring according to claim 1,

the pressing part has a side surface protruding from the supporting and pressing surface,

the side surface faces an arc-shaped outer side surface of the C-shaped retainer ring in the retainer ring holding state.

3. The tool for C-shaped retainer ring according to claim 2,

the pressing portion has an opposed surface connected to an end of the side surface opposite to the supporting and pressing surface side and opposed to the supporting and pressing surface with a gap therebetween, the supporting and pressing surface, the side surface, and the opposed surface defining a groove,

in the retainer ring holding state, a part of the C-shaped retainer ring is sandwiched by the support pressing surface and the facing surface.

4. A tool component for a C-ring, to be mounted to a snap ring pliers, the snap ring pliers comprising: a pair of arms including a pair of pin portions on a distal end side; and a block portion connected to an end portion of at least one of the arms on a side opposite to the pin side, the C-shaped retainer ring tool member including:

a ring-shaped portion inserted from a distal end side of the pin so as to pass through the pin when attached to the clip pliers, and arranged to surround the block portion;

a pressing portion including a support pressing surface, at least a portion of which is contactable with a portion of an end surface on an insertion side of the pin portion of the C-shaped retainer ring in a state where the pair of pin portions are inserted through the pair of tool insertion holes of the C-shaped retainer ring and the annular portion is arranged to surround the block portion; and

a protruding portion protruding from one end portion in an extending direction of the annular portion and having a distal end portion connected to the pressing portion,

when the pair of pin portions are inserted into the pair of tool insertion holes in a state where the C-shaped retainer tool member is attached to the clip pliers, the retainer holding state can be established in which at least a part of the support and pressing surface is in contact with a part of the end surface.

5. The tool part for a C-shaped retainer ring according to claim 4,

6. The tool part for a C-shaped retainer ring according to claim 5,

7. The tool part for a C-type check ring according to any one of claims 4 to 6,

the annular portion includes a diameter-enlarged portion, and a cross-sectional area of the through-hole of the diameter-enlarged portion, which is perpendicular to the extending direction, gradually increases toward a side opposite to the protruding portion in the extending direction.

8. A method of attaching a C-type retainer to a retainer groove provided in a shaft portion using the tool for a C-type retainer according to claim 3, the method comprising:

a retaining ring holding step of inserting the pair of pin portions of the C-shaped retaining ring tool into the pair of tool insertion holes and sandwiching a part of the C-shaped retaining ring by a support pressing surface and an opposing surface;

a fitting step of, after the retainer holding step, fitting the C-shaped retainer to the outer peripheral surface of the shaft portion after moving the pair of handles so as to expand the distance between the pair of pins and thereby expanding the diameter of the C-shaped retainer;

a retainer ring attaching step of, after the fitting step, moving the C-shaped retainer ring tool toward the retainer ring groove in the axial direction of the shaft portion until the C-shaped retainer ring is fitted into the retainer ring groove; and

and a tool removing step of removing the pair of pins from the pair of tool insertion holes after the retainer ring attaching step, and then separating the support pressing surface and the opposed surface from the C-shaped retainer ring.