JP2011152607A - Cutting pliers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain cutting pliers capable of easily separating between tips of a pair of legs of a cotter pin. <P>SOLUTION: The cutting pliers include a pair of arms 21A and 21B, respectively having coupling parts 22a and 22b structured between one and the other ends, rotatably coupled around a rotation axis passing through the coupling parts 22a and 22b, and structured so that ends come closer to/farther away from each other as the other ends come closer to/farther away from each other. On one of ends of one of the arms 21A, a pin fitting recess 26 opened toward the other arm 21B and permitting a head 3 to be fitted into is formed in a predetermined length. A sharp protrusion 28 in a shape of a wall face is provided on one end of the other arm 21B, which has a peak 28a facing the deepest part of the pin fitting recess 26 and comprises a pin aligning surface 29 extending from the peak 28a in a direction separating from the pin fitting recess 26 and a first pin bending surface 30 extending from the peak 28a to gradually separate from the pin fitting recess 26 as coming farther away from the pin aligning surface 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pliers suitable for separating the tips of leg portions of a split pin.

  It is widely known that a split pin is used as a means for preventing a shaft inserted in a loosely fitted state on a shaft support member from falling off the shaft support member.

  For example, a conventional hanging insulator includes an insulator body, a cap portion attached to the outer peripheral surface of the insulator body, a pair of projecting pieces provided on the upper end portion of the cap portion so as to face each other, and a pair of projecting pieces. A cotter pin that is inserted into the fitted state and supported by the projecting piece and is located near the outside of the pair of projecting pieces, and a pin hole having a radial direction as a hole direction is inserted into the pin hole. And a cotter pin that prevents the cotter pin from falling off the protruding piece (see, for example, Patent Document 1).

  The split pin has a shape in which a rod-shaped member made of, for example, steel is folded at a predetermined portion in the longitudinal direction, and a pair of leg portions extending from the head portion in one direction without a substantial gap therebetween. The distal end side of one leg portion is slightly extended from the distal end of the other leg portion.

  The split pin is used by inserting a pair of leg portions into the pin hole and bending the distal ends of the pair of leg portions extending from the pin hole in directions opposite to each other. As a result, even if the cotter pin moves in the axial direction and tries to come off from the protruding piece, the tip side of the leg protruding from the head or the pin hole comes into contact with the protruding piece, so the cotter pin may fall off the protruding piece. It was prevented.

Utility Model Registration No. 3122955

  In the conventional hanging insulator, the split pin is disposed by inserting the pair of leg portions into the pin hole so that the distal ends of the pair of leg portions are extended side by side in the circumferential direction of the cotter pin. The split pin is attached to the cotter pin by bending the distal ends of the pair of leg portions in directions opposite to each other in the circumferential direction of the cotter pin. At this time, first, the pair of leg portions is bent by first bending the distal end side of one long leg portion and then bending the distal end side of the other leg portion away from the distal end side of one leg portion. The tip side of the was separated.

  Since the cotter pin is rotatable around its axis, when folding the tip of one leg, grasp the head with a pair of radio pliers held by one hand so that the rotation of the cotter pin is restricted. While applying a force to the head, it is necessary to grip and bend the tip side of one leg with radio pliers held by the other hand.

  One leg portion of the split pin is only slightly extended from the tip of the other leg portion, and it is difficult to grip one leg portion with radio pliers. In order to prevent the cotter pin from rotating under these conditions, a skilled technique is required to fold one leg by applying an appropriate force to the radio pliers held by both hands. The efficiency of installation work on the camera will be greatly reduced.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a pliers that can easily separate the tips of a pair of leg portions of a split pin.

  The pliers of the present invention are for separating the tips of a pair of split pins provided with a head and a pair of legs extending in one direction from the head, one end and the other end, respectively. A connecting portion configured between the two ends. The connecting portion is rotatably connected around a rotation axis passing through the connecting portion, and the one end approaches and separates as the other end approaches and separates. A pair of arms configured as described above is provided, and one arm of one arm has an opening toward the other arm, and a pin fitting recess into which the head of the split pin can be fitted has a predetermined length The other arm has a top portion facing the deepest portion of the pin fitting recess, extending from the top portion in a direction away from the pin fitting recess, and from the pin fitting surface The first pin extending from the top so as to gradually move away from the pin fitting recess as it leaves. Peak protrusions of the wall surface shape composed of the bottom surface is formed.

  According to this invention, with respect to the split pin having a pair of legs inserted through the shaft, the pin fitting recess fits into the head of the split pin, and the pin pliing surface is along one leg. The tip protrusions can be pushed between the pair of legs simply by rotating the pair of arms so as to narrow the gap between the ends of the pair of arms. In other words, the operator can separate the tip ends of the pair of leg portions by simply performing an easy operation of rotating the pair of arms around the rotation axis, and insert the split pin through the shaft. Workability when mounting is significantly improved.

It is a front view of a split pin. It is a perspective view explaining the usage example of a split pin. It is a front view of the pliers concerning Embodiment 1 of this invention. FIG. 4 is a side view of the pliers viewed from the direction A in FIG. 3. In the pliers concerning Embodiment 1 of this invention, it is a side view which shows the state which fitted the head to the pin fitting recessed part, and has arrange | positioned the split pin between the one ends of a pair of arm action part. It is a front view explaining the operation | work which attaches a split pin to an axis | shaft using the pliers concerning Embodiment 1 of this invention. It is VII-VII arrow sectional drawing of FIG. It is a front view which shows the state in which the split pin was attached to the axis | shaft. It is a side view of the pliers concerning Embodiment 2 of this invention. It is sectional drawing explaining the operation | work which attaches a split pin to an axis | shaft using the pliers concerning this Embodiment 2. FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
First, prior to the description of the pliers, the structure of the split pin will be described.
FIG. 1 is a front view of the split pin.
In FIG. 1, a split pin 1 is produced by bending a steel rod-like member, for example, and a head 3 and a pair of legs that extend from the head 3 in one direction without a substantial gap therebetween. Part 2a, 2b.
The head 3 has a shape in which a part of an annular body having a predetermined inner diameter is cut out.
A pair of leg portions 2 a and 2 b extend from both ends of the head 3. One leg 2a is made longer than the other leg 2b, and the tip end of one leg 2a extends slightly from the tip of the other leg 2b.

Next, a usage example of the split pin 1 configured as described above will be described.
FIG. 2 is a perspective view for explaining a usage example of the split pin.
In FIG. 2, the split pin 1 is used to prevent the shaft 13 inserted through a pair of shaft support portions 11 protruding so as to face the main body 10 of any device from slipping out of the shaft support portion 11. It is done.

  A pin insertion hole 13a whose hole direction coincides with the radial direction is formed in a portion near one end and the other end of the shaft 13 in the axial direction. Although not shown in detail, the interval between the pair of pin insertion holes 13 a is set to be slightly wider than the interval between the pair of shaft support portions 11. The shaft 13 has one end and the other outside the pair of shaft support portions 11 so that each of the pin insertion holes 13a is disposed outside the pair of shaft support portions 11 and in the vicinity of the shaft support portion 11. The end is extended and is supported by the shaft support portion 11.

  The split pin 1 is disposed by inserting the pair of leg portions 2a and 2b through the pin insertion hole 13a, and the distal ends of the pair of leg portions 2a and 2b extending from the pin insertion hole 13a are separated from each other. It is bent and attached to the shaft 13. The split pin 1 attached in this way prevents the shaft 13 from falling off the pair of shaft support portions 11.

Next, the pliers will be described.
3 is a front view of the pliers according to Embodiment 1 of the present invention, FIG. 4 is a side view of the pliers viewed from the direction A in FIG. 3, and FIG. 5 is a pin fitting in the pliers according to Embodiment 1 of the present invention. It is a side view which shows the state which fitted the head to the recessed part and has arrange | positioned the split pin between the one ends of a pair of arm action part.

  3 to 5, the pliers 20 </ b> A have connecting portions 22 a and 22 b each formed in a predetermined region in the intermediate portion in the extending direction, the connecting portions 22 a and 22 b are overlapped with each other, and the respective connecting portions 22 a. , 22b are provided with a pair of arms 21A, 21B that are pivotally connected around a rotation axis that passes through the connecting portions 22a, 22b. The pair of arms 21A and 21B are configured to be opposed to each other on one end side.

  One arm 21A includes a connecting portion 22a, an arm action portion 23a extending from the connecting portion 22a in opposite directions, and a gripping portion 24a. In addition, the arm action part 23a is arrange | positioned at the one side of the connection part 22a, and the clamping part 25a is comprised in the front end side of the arm action part 23a.

  The pinching portion 25a has a predetermined width in the axial direction of the rotation axis, and the pin fitting recess 26 that opens at the center in the width direction of the pinching portion 25a is connected to the head 3 of the split pin 1. It is formed in a predetermined length from the distal end side (one end of the arm 21A) of the arm action portion 23a toward the connecting portion 22a so as to be fitted. The shape of the cross section perpendicular to the longitudinal direction of the pin fitting recess 26 is deepest at the center in the width direction of the sandwiching portion 25a, and gradually becomes wider from the deepest portion to the opening.

Similarly to the arm 21A, the other arm 21B includes a connecting portion 22b, an arm operating portion 23b, and a gripping portion 24b, and a clamping portion 25b is configured on the distal end side of the arm operating portion 23b.
And the clamping part 25b has the width | variety of the rotation-axis center direction which corresponds to the width | variety of the clamping part 25a, and the one side and the other side of the width center of the clamping part 25b are comprised by the peak protrusion part 28 and the low bottom part 31a. Has been. The wall surface of the peak projecting portion 28 is orthogonal to the rotational axis, protrudes from the end of the holding portion 25b of the low bottom portion 31a on the width center side, and the projecting end constitutes the top portion 28a of the peak projecting portion 28. It has the 1st pin bending surface 30 extended from the top part 28a, changing the wall surface position to the base end side of the pin alignment surface 29 gradually as it leaves | separates from the alignment surface 29 and the pin alignment surface 29. As shown in FIG.

  In addition, the surface of the low bottom portion 31 a disposed so as to face the sandwiching portion 25 a is orthogonal to the pin alignment surface 29. The distance between the top portion 28a and the base end portion of the pin alignment surface 29 is such that the leg portions 2b and 2c of the split pin 1 are inserted into the pin insertion holes 13a formed on the shaft 13, and the head 3 is pivoted. 13 is set so as to be longer than the length on the tip side of one leg 2a extending from the pin insertion hole 13a.

Next, a connection structure of the pair of arms 21A and 21B will be described.
The pair of arms 21A and 21B are arranged such that the connection portions 22a and 22b are overlapped so that the pair of arm action portions 23a and 23b and the pair of gripping portions 24a and 24b face each other, and are inserted through the connection portions 22a and 22b. The pivot shaft 32 is pivotally connected around the axis of the pivot shaft pin 32.

  The connecting portions 22a and 22b are formed with through holes (not shown) whose hole centers coincide with the rotation axis. The rotation shaft pin 32 is configured to have a slightly smaller diameter than the through hole of the connecting portion, and has a pin shaft (not shown) having a male screw formed at one end and a diameter larger than the pin shaft at the other end of the pin shaft. A head 33 is provided. Then, the pin shaft is inserted into the through holes of the connecting portions 22a and 22b from the connecting portion 22a side, and the nut is screwed onto the male screw of the pin shaft extending from the other connecting portion 22b, thereby a pair of arms 21A and 21B. Are connected. At this time, the pair of connecting portions 22a and 22b are configured not to be clamped between the head 33 and the nut of the rotation shaft pin 32, whereby the pair of arms 21A and 21B are configured to have the rotation axis. It is possible to rotate around the axial center of the rotation shaft pin 32 as described above.

  In the pliers 20A configured by connecting the pair of arms 21A and 21B as described above, the pin fitting concave portion 26 opens toward one end side of the other arm 21B, and the top portion 28a of the peak projecting portion 28 is formed. And the pin fitting recess 26 are in a relative positional relationship. Further, when the pair of gripping portions 24a and 24b are operated so that the tips of the pair of gripping portions 24a and 24b (the other ends of the pair of arms 21A and 21B) approach and separate, the arm action portions 23a and 23b In other words, the tip end (one end of the pair of arms 21A and 21B), in other words, the pin fitting recessed portion 26 and the peak projecting portion 28 are approached and separated.

  Further, as shown in FIG. 5, the apex 28 a of the pointed protrusion 28 of the other arm 21 </ b> B is disposed at a position facing the deepest portion of the pin fitting recess 26. At this time, the pin fitting surface 29 extends from the top portion 28a in the direction away from the pin fitting recess 26, and the first pin bending surface 30 gradually moves away from the pin fitting recess 26 as the distance from the pin fitting surface 29 increases. It extends from the top part 28a so that it may space apart.

  As described above, since the fitting recess 26 and the peak protrusion 28 are opposed to each other, the pin fitting recess 26 and the peak protrusion 28 are separated from the split pin 1 inserted through the shaft 13. If the direction is adjusted by moving the pliers 20 </ b> A to an appropriate position, the one leg 2 a can be along the pin alignment surface 29 with the head 3 fitted in the fitting recess 26.

Next, an operation of attaching the split pin 1 to the shaft 13 using the pliers 20A will be described.
6 is a front view for explaining the operation of attaching the split pin to the shaft using the pliers according to Embodiment 1 of the present invention, FIG. 7 is a sectional view taken along the arrow VII-VII in FIG. 6, and FIG. It is a front view which shows the state attached to.

As an initial state, the shaft 13 is supported by the shaft support portion 11 with one end and the other end extending outside the pair of shaft support portions 11 as shown in FIG.
As shown in FIG. 6, the operator first inserts the pair of leg portions 2 a and 2 b of the split pin 1 into the pin insertion hole 13 a formed in the shaft 13. Next, the pair of arms 21 </ b> A and 21 </ b> B is rotated around the axis of the rotation shaft pin 32, so that the distance between the pin fitting recess 26 and the peak protrusion 28 is wider than the length of the split pin 1.

  After the split pin 1 is oriented so that the distal ends of the pair of legs 2a and 2b are aligned in the circumferential direction of the shaft 13, the pin fitting recess 26 is fitted to the head 3 of the split pin 1, and the orientation of the pliers 20A The one leg portion 2a is caused to run along the pin fitting surface 29. At this time, a portion between the tip of the other leg 2b and the one leg 2a is opposed to the top 28a of the peak protrusion 28. Subsequently, the space | interval of the pin fitting recessed part 26 and the peak protrusion part 28 is narrowed.

  Further, as shown in FIG. 7, the pair of arms 21A and 21B are rotated so as to narrow the distance between the pin fitting recess 26 and the peak protrusion 28, and the top 28a of the peak protrusion 28 is set to a pair of legs. Push between the parts 2a, 2b. At this time, the pin alignment surface 29 moves along the one leg 2a while being in contact with the distal end side of the one leg 2a, and the first pin bending surface 30 is moved to the proximal end side of the other leg 2b. Move towards. As a result, the distal end side of the other leg portion 2b is pushed by the first pin bending surface 30 and bent in the direction along the first pin bending surface 30, so that it is separated from the distal end side of the one leg portion 2a.

  In this way, after the tips of the pair of legs 2a and 2b are separated from each other, the tips of the pair of legs 2a and 2b are gripped by, for example, radio pliers (not shown) gripped by both hands. As shown, the pair of legs 2a and 2b are bent in the opposite directions. As described above, the split pin 1 is attached to the shaft 13 and the dropping of the shaft 13 from the shaft support portion 11 is prevented.

  According to the first embodiment, the pliers 20A have connecting portions 22a and 22b configured between one end and the other end, respectively, and rotate around a rotation axis that passes through the connecting portions 22a and 22b. A pair of arms 21 </ b> A and 21 </ b> B are configured to be freely connected and configured so that one end approaches and separates as the other end approaches and separates. A pin fitting recess 26 that opens toward the other arm 21B and can be fitted to the head 3 is formed at one end of the one arm 21A. Further, on one end side of the other arm 21B, there is a top portion 28a facing the deepest portion of the pin fitting concave portion 26, and a pin alignment surface 29 extending from the top portion 28a in a direction away from the pin fitting concave portion 26, Further, as the distance from the pin alignment surface 29 increases, a wall-shaped pointed protrusion 28 formed of a first pin bending surface 30 extending from the top 28 a so as to be gradually separated from the pin fitting recess 26 is formed.

  Therefore, with respect to the split pin 1 in which the pair of legs 2a and 2b are inserted into the shaft 13, the pin fitting recess 26 is fitted to the head 3 of the split pin 1, and the pin alignment surface 29 is one leg. 2a, the pliers 20A are moved so as to narrow the gap between one end of the pair of arms 21A, 21B. It can be pushed in between 2b. That is, the operator simply performs an easy operation of rotating the arms 21A and 21B around the rotation axis so that the pointed protrusion 28 is pushed between the pair of legs 2a and 2b. The other leg 2b can be bent so that the tips of the legs 2a, 2b are spaced apart from each other.

  Further, if the other leg 2b is bent, the ends of the pair of legs 2a and 2b are separated from each other, so that the ends of the pair of legs 2a and 2b are respectively connected to the radio pliers held by both hands. Easy to grasp. As a result, the operation of bending one leg 2a to the opposite side of the other leg 2b is to maintain the state of the radio pliers holding the tip of the other leg 2b while moving the tip of the one leg 2a. This can be done easily by bending the other leg 2a to the opposite side of the tip. By using the pliers 20 </ b> A, workability when the split pin 1 is inserted through the shaft 13 and attached can be remarkably improved.

  In the first embodiment, the pin fitting recess 26 and the pointed protrusion 28 are described as having a predetermined length from one end of one and the other arms 21A and 21B toward the connecting portion 22a. However, the pin fitting recessed part 26 and the peak protrusion part 28 are not limited to what is formed toward the connection part 22a from the end of one side and the other arm 21A, 21B. The pin fitting recessed part 26 and the peak protrusion part 28 should just be formed in the predetermined | prescribed site | part of one end side from connection part 22a, 22b of one and the other arms 21A and 21B.

  Moreover, although the pin fitting recessed part 26 was demonstrated as a shape where the cross section perpendicular | vertical to a longitudinal direction becomes a shape which becomes gradually wide toward the opening from the deepest part, the shape of a pin fitting recessed part is not limited to this. The cross-sectional shape perpendicular to the longitudinal direction of the pin fitting recess may be any shape as long as the head 3 of the split pin 1 can be fitted. For example, the cross-sectional shape of the pin fitting concave is changed to the head 3 of the split pin 1. A rectangular shape having a predetermined depth that is slightly wider than the diameter may be used.

Embodiment 2. FIG.
FIG. 9 is a side view of a pliers according to Embodiment 2 of the present invention, and FIG. 10 is a cross-sectional view illustrating an operation of attaching a split pin to a shaft using the pliers according to Embodiment 2 of the present invention.
9 and 10, the same reference numerals are given to the same or corresponding parts as those in the first embodiment, and the description thereof is omitted.

In FIG. 9, the pliers 20B are configured in the same manner as the pliers 20A except that the arm 21C is used instead of the arm 21B.
The arm 21C is configured in the same manner as the arm 21B except that it has an arm action part 23c formed with a clamping part 25c composed of a low bottom part 31b and a pointed protrusion 28 instead of the arm action part 23b.
The surface of the low bottom portion 31b disposed relative to the sandwiching portion 25c is predetermined from the top portion 28a so that the wall surface position is changed in a direction away from the surface perpendicular to the pin alignment surface 29 as the distance from the pin alignment surface 29 increases. A second pin bending surface 34 extending from the base end portion of the pin alignment surface 29 separated by a distance is formed. The predetermined distance is set to be longer than the length of one leg 2a extending from the other leg 2b in the split pin 1.

  In the pliers 20B configured by connecting the pair of arms 21A and 21C, the base end portion of the pin alignment surface 29 is disposed at a position spaced apart from the top portion 28a by a predetermined distance in a direction away from the pin fitting recess 26. Is done. Then, as the second pin bending surface 34 moves away from the pin fitting surface 29, the second pin bending surface 34 gradually moves away from the pin fitting recess 26 from the proximal end portion of the pin fitting surface 29 to the opposite side of the first pin bending surface 30. Extended.

  Next, an operation of attaching the split pin 1 to the shaft 13 using the pliers 20B will be described.

As an initial state, the shaft 13 is supported by the shaft support portion 11 with one end and the other end extending outside the pair of shaft support portions 11 as shown in FIG.
First, the operator inserts the pair of leg portions 2 a and 2 b of the split pin 1 through the pin insertion hole 13 a formed in the shaft 13. Next, the pair of arms 21 </ b> A and 21 </ b> C are rotated around the axis of the rotation shaft pin 32, so that the distance between the pin fitting recess 26 and the peak protrusion 28 is wider than the length of the split pin 1.

  After the split pin 1 is oriented so that the distal ends of the pair of legs 2a and 2b are aligned in the circumferential direction of the shaft 13, the pin fitting recess 26 is fitted to the head 3 of the split pin 1, and the orientation of the pliers 20B The one leg portion 2a is caused to run along the pin fitting surface 29. At this time, a portion between the tip of the other leg 2b and the one leg 2a is opposed to the top 28a of the peak protrusion 28. Subsequently, the space | interval of the pin fitting recessed part 26 and the peak protrusion part 28 is narrowed.

  Further, as shown in FIG. 10, the pair of arms 21A and 21C are rotated so as to narrow the distance between the pin fitting recess 26 and the pointed protrusion 28, and the apex part 28a of the pointed protrusion 28 is moved to the pair of legs. Push between the parts 2a, 2b. At this time, the pin alignment surface 29 moves along the one leg 2a while being in contact with the distal end side of the one leg 2a, and the first pin bending surface 30 is moved to the proximal end side of the other leg 2b. Move towards. As a result, the distal end side of the other leg portion 2b is pushed by the first pin bending surface 30 and bent in the direction along the first pin bending surface 30, so that it is separated from the distal end side of the one leg portion 2a.

  After the other leg 2b is bent, the pair of arms 21A and 21C are further rotated so as to narrow the distance between the pin fitting recess 26 and the peak protrusion 28. Thereby, the 2nd pin bending surface 34 contact | abuts to one leg part 2a. Furthermore, the space | interval of the pin fitting recessed part 26 and the peak protrusion part 28 is narrowed. Thereby, the tip end side of the other leg portion 2 b is pushed by the second pin bending surface 34 and bent in a direction along the first pin bending surface 30. At this time, the pair of leg portions 2a and 2b are bent to the opposite sides.

  The pliers 20 </ b> B of the second embodiment has a pointed protrusion 28 having a pin alignment surface 29 and a first pin bending surface 30 on the one end side of the other arm 21 </ b> C, and a distance from the pin alignment surface 29. The second pin bending surface 34 extending from the base end portion of the pin alignment surface 29 that is separated from the top portion 28a by a predetermined distance toward the direction away from the fitting recess 26 so as to gradually move away from the pin fitting recess 26. And a low bottom portion 31b having a wall shape.

  Therefore, when the pliers 20B are used, the operator pushes the pointed protrusion 28 between the pair of legs 2a and 2b, and the one leg 2a comes into contact with the second pin bending surface 34. Further, by simply performing an easy operation of rotating the pair of arms 21A and 21C so as to narrow one end of the pair of arms 21A and 21C, the tips of the pair of legs 2a and 2b are simultaneously spaced apart from each other. Can be folded. Therefore, workability when the split pin 1 is inserted through the shaft 13 and attached can be further improved.

  1 split pin, 2a, 2b leg, 3 head, 20A, 20B pliers, 21A-21C arm, 22a, 22b connecting part, 26 pin fitting recess, 28 pointed protrusion, 28a top, 29 pin surface , 30 1st pin bending surface, 31b Low bottom part, 34 2nd pin bending surface.

Claims (2)

A pliers for separating the tips of a pair of legs of a split pin comprising a head and a pair of legs extending in one direction from the head,
Each has a connecting portion configured between one end and the other end, and is rotatably connected around a rotation axis passing through the connecting portion, and according to approaching and separating between the other ends, A pair of arms configured to approach and separate from one end;
On one end side of one of the arms, a pin fitting recess that is open toward the other arm and into which the head can be fitted is formed to a predetermined length.
On one end side of the other arm, there is a top portion facing the deepest portion of the pin fitting recess, a pin running surface extending from the top in a direction away from the pin fitting recess, and the pin running A pliers having a wall-shaped pointed protrusion formed of a first pin bending surface extending from the top so as to gradually move away from the pin fitting recess as the distance from the surface increases.   The one end of the other arm has a predetermined distance from the top in a direction away from the fitting recess so as to gradually move away from the pin fitting recess as the distance from the pin alignment surface increases. The pliers according to claim 1, wherein a low bottom portion having a second pin bending surface extending from a proximal end portion of the pin alignment surface in a wall shape is formed.

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