JP5635143B2 - Cotter insertion aid - Google Patents

Description

  The present invention relates to a cotter insertion aid. In particular, the first through hole that penetrates the clevis-type support portion provided at the end of a suspended insulator or the like matches the second through-hole that penetrates the support member connected to the clevis-type support portion, so that the cotter can be inserted. It relates to the structure of an auxiliary tool that facilitates.

  The main body of the insulator is made of porcelain. Generally, an insulator is interposed between an electric wire and a support member, and insulates and supports the electric wire. For example, in a so-called insulator series in which a plurality of hanging insulators are connected by a plurality of cotters, one end portion thereof is supported by a utility pole or a steel tower, and an electric wire is stretched at the other end portion.

  FIG. 11 is a front view of the suspended insulator arranged continuously as described above, and a part thereof is shown in cross section. Referring to FIG. 11, the hanging insulator 7 includes an umbrella-like main body 70 made of porcelain. The hanging insulator 7 includes a double clevis-shaped first support portion 71 and a single clevis-shaped second support portion 72. The first support portion 71 protrudes from the upper portion of the main body 70. The second support portion 72 protrudes from the lower portion of the main body 70.

  Referring to FIG. 11, by inserting the columnar cotter 8 with the first through hole 71 h penetrating the first support portion 71 and the second through hole 72 h penetrating the second support portion 72 aligned. A plurality of hanging insulators 7 can be swingably connected around the cotter 8. After connecting the plurality of hanging insulators 7, the cotter 8 is attached with a split pin 8p for preventing the falling off.

  Referring to FIG. 11, for example, a large suspension insulator 7 standardized by JIS has a second through hole 72 h partially opened inside the main body 70. For this reason, the single clevis of the second support part 72 is slid between the double clevises of the first support part 71 with the tip part of the cotter 8 partially inserted into the first through hole 71h. The cotter 8 was inserted after the first through hole 71h and the second through hole 72h were completely matched.

  However, since the tip portion of the cotter 8 is flat, it is difficult to insert the cotter 8 until the first through hole 71h and the second through hole 72h completely coincide with each other, and the first through hole 71h and the second through hole. Since it is not easy to visually confirm that the holes 72h are completely coincident with each other, labor and time have been spent on the cotter insertion work.

  In order to solve such problems, there has been disclosed a cotter insertion assisting tool that assists in inserting a cotter so that the cotter can be easily inserted into a clevis-shaped through hole provided in a hanging insulator or the like (for example, a patent Reference 1).

  The cotter insertion assisting tool according to Patent Document 1 is formed in a substantially conical shape so that the inside of the cotter can be inserted into a hollow cylindrical fitting portion and the fitting portion gradually converges continuously. The interior consists of a solid point. Then, with the tip of the cotter inserted into the fitting part, the tip is driven into the clevis-type through hole, and the cotter is pulled out of the cotter-type through-hole after the cotter has passed through the clevis-type through-hole. It can be inserted into.

JP 2008-84731 A

  However, the cotter insertion assisting tool according to Patent Document 1 has a concern of being dropped during work at a high place, and a countermeasure for preventing the dropping has been demanded. Further, the cotter insertion assisting tool according to Patent Document 1 has a conical tip, so that it is difficult to grasp and the cotter is difficult to pull out, and there is a concern of dropping the cotter insertion assisting tool after being pulled out from the cotter. It was. There was a need for measures to prevent the cotter insertion aid from dropping easily after the cotter was mounted on the hanging insulator. The above can be said to be the subject of the present invention.

  The present invention has been made in view of such problems, and solves the problems of the conventional cotter insertion assisting tool and allows the cotter to be easily inserted into a clevis-shaped through hole provided in a hanging insulator or the like. Another object of the present invention is to provide a cotter insertion assisting tool that assists in inserting a cotter.

  The inventors have inserted the first string-attached connector into the base end of the auxiliary tool body to prevent the cotter insertion auxiliary tool from falling, and after inserting the auxiliary tool body into the clevis-shaped through hole, The cotter can be easily inserted into the clevis-shaped through-hole by inserting the cotter into the base end of the auxiliary tool body instead of the connecting tool, tethering the second string body to the distal end of the auxiliary tool body, and pulling the auxiliary tool body. Based on this, the following new cotter insertion aids have been invented.

  (1) A cotter insertion assisting tool according to the present invention includes a first clevis-shaped first support portion and a first clevis-shaped second support portion that are swingably connected to the first support portion. The first through hole is formed so that the first through hole and the second through hole penetrating the second support portion are aligned with each other and has a hook portion for retaining the base end portion, and the split pin can be inserted from the outer peripheral direction. A cotter insertion assisting tool for assisting in inserting a columnar cotter included in a portion, a columnar first shaft portion having an outer diameter that can be inserted into the first through hole and the second through hole, An auxiliary end having an insertion end that is reduced in diameter toward the tip end of the first shaft portion and a recess that is recessed in the axial direction so that the tip end portion of the cotter can be fitted to the base end portion of the first shaft portion. It has a tool body and a second shaft part that can be fitted into the recess of the auxiliary tool body at one end to prevent falling. A column-shaped coupling tool in which the first string body is anchored to the other end portion, and the recesses of the auxiliary tool body protrude from the inner wall so as to face each other, and at the opening end of the first insertion hole of the cotter It has a pair of hemispherical protrusions that can be fitted, and the second shaft portion of the connector has a second insertion hole penetrating in the outer circumferential direction at the end, and the opening end of the second insertion hole is The pair of protrusions can be fitted.

  (2) The auxiliary tool body is capable of tethering a second string for pulling the auxiliary tool body through the first through hole and the second through hole in a state where the cotter is connected to the recess. It is preferable to have a simple hole at the insertion end.

  (3) The cotter insertion method according to the present invention includes a first clevis-shaped first support portion and a single clevis-shaped second support portion that are pivotally connected to the first support portion in order to swingably connect. The first through hole is formed so that the first through hole and the second through hole penetrating the second support portion are aligned with each other and has a hook portion for retaining the base end portion, and the split pin can be inserted from the outer peripheral direction. A cotter insertion method for inserting the cotter into the first through hole and the second through hole by using a cotter insertion assisting tool for assisting in inserting a cylindrical cotter having a cotter part, the cotter insertion assist The tool includes a cylindrical first shaft portion having an outer diameter that can be inserted into the first through hole and the second through hole, an insertion end portion that is reduced in diameter toward the tip portion of the first shaft portion, and the Formed at the base end of the first shaft, the tip of the cotter can be fitted An auxiliary tool body having a recessed portion recessed in the axial direction, and a second shaft portion that can be fitted into the recessed portion of the auxiliary tool body are provided at one end portion, and the first string body for preventing fall is tethered to the other end portion. And a concave portion of the auxiliary tool body has a pair of hemispherical protrusions that protrude from the inner wall so as to face each other and can be fitted to the opening end of the first insertion hole of the cotter. The second shaft portion of the connector has a second insertion hole whose opening end can be fitted into the pair of protrusions, and the auxiliary tool body is connected to the recess, The insertion end portion has a hole portion capable of anchoring a second string body for pulling out the auxiliary tool body so as to pass through the first through hole and the second through hole, and the first string body is connected to the connection tool. The second shaft portion is inserted into the concave portion of the auxiliary tool body in a state where the auxiliary tool body is connected to the connecting tool. A first step, a second step of inserting into the first through hole and the second through hole with the insertion end portion at the top in a state where the auxiliary tool body and the connector are connected, and the first step. In a state where the insertion end protrudes from one end surface of the support portion, a third step of tethering the second string body to the insertion end, and holding the second string body and the first string body Pulling and removing the connecting tool from the auxiliary tool body, and inserting the tip of the cotter into the recessed part of the auxiliary tool body to fit the pair of protrusions into the first insertion hole. 5 steps, a sixth step of moving the auxiliary tool main body and the cotter by pulling the second string body until the collar part contacts the other end surface of the first support part, and the collar part is Pulling the second string body in contact with the other end surface of the first support portion, the cotter And a seventh step of removing the auxiliary tool body from the main body.

  The cotter insertion assisting tool according to the present invention has an auxiliary tool main body having a recessed portion that is recessed in the axial direction so that the tip end portion of the cotter can be fitted, and a second shaft portion that can be fitted in the recessed portion of the auxiliary tool main body at one end portion. The recess of the auxiliary tool body protrudes from the inner wall so as to face each other, and can be fitted to the opening end of the first insertion hole of the cotter or the opening end of the second insertion hole provided in the second shaft portion Since it has a pair of hemispherical projections, the cotter can be easily inserted into the clevis-shaped through hole.

  Moreover, since the cotter insertion assisting tool according to the present invention has the first string body anchored to the connecting tool and the second string body can be anchored to the assisting tool body, the connecting tool and the assisting tool body can be prevented from falling. .

It is a perspective view which shows the structure of the cotter insertion auxiliary tool by one Embodiment of this invention, and shows the state before a set of suspension insulators are connected with a cotter in the perspective exploded view. It is a perspective view which shows the structure of the cotter insertion auxiliary tool by the said embodiment, FIG. 2 (A) is a state figure which the auxiliary tool main body and the connection tool connected, FIG.2 (B) is a connection tool from the auxiliary tool main body. FIG. 2 (C) is a state diagram before inserting the cotter into the auxiliary tool body, and FIG. 2 (D) is a state diagram when the cotter is inserted into the auxiliary tool body. It is a front view which shows the structure of the cotter insertion auxiliary tool by the said embodiment, FIG. 3 (A) is a state figure which the auxiliary tool main body and the connection tool connected, FIG.3 (B) is a connection tool from the auxiliary tool main body. FIG. 3C is a state diagram before the cotter is inserted into the auxiliary tool body, and FIG. 3D is a state diagram when the cotter is inserted into the auxiliary tool body. It is a front view of the cotter insertion assistance tool by the said embodiment, and is a state figure just before inserting a cotter insertion assistance tool into a set of suspension insulators. It is a front view of the cotter insertion assistance tool by the said embodiment, and is a state figure which inserted the cotter insertion assistance tool in a set of suspension insulators. It is a front view of the cotter insertion auxiliary tool by the said embodiment, and is the state figure which tethered the 2nd string body to the auxiliary tool main body. It is a front view of the cotter insertion assistance tool by the said embodiment, and is the state figure which removed the connection tool from the assistance tool main body. It is a front view of the cotter insertion auxiliary tool by the said embodiment, and is a state figure before inserting a cotter into an auxiliary tool main body. It is a front view of the cotter insertion auxiliary tool by the said embodiment, and is a state figure which inserted the cotter in the auxiliary tool main body. It is a front view of the cotter insertion auxiliary tool by the said embodiment, and is a state figure which removed the auxiliary tool main body from the cotter. It is a front view of the suspension insulator provided in a row by the cotter, and a part is shown in cross section.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, the cotter insertion assistance tool by this invention demonstrates the Example which assists the insertion of a cotter to the several suspended insulator provided as a suitable embodiment.

[Composition of cotter insertion aid]
Initially, the structure of the cotter insertion auxiliary tool by one Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a configuration of a cotter insertion assisting tool according to an embodiment of the present invention, and shows a state before a set of hanging insulators are connected by a cotter in a perspective exploded view.

  FIG. 2 is a perspective view showing a configuration of the cotter insertion assisting device according to the embodiment, FIG. 2A is a state diagram in which the assisting device main body and the connecting tool are connected, and FIG. 2B is an assisting device main body. FIG. 2 (C) is a state diagram before inserting the cotter into the auxiliary tool body, and FIG. 2 (D) is a state diagram when the cotter is inserted into the auxiliary tool body.

  FIG. 3 is a front view showing the configuration of the cotter insertion assisting tool according to the embodiment, FIG. 3A is a state diagram in which the assisting tool body and the connecting tool are connected, and FIG. 3B is an assisting tool body. FIG. 3C is a state diagram before inserting the cotter into the auxiliary tool body, and FIG. 3D is a state diagram when the cotter is inserted into the auxiliary tool body. In addition, since the effect | action of the component which has the same code | symbol disclosed by FIG. 11 is the same, it may omit in the following description.

  1 to 3, a cotter insertion assisting tool (hereinafter abbreviated as an assisting tool) 10 according to an embodiment of the present invention includes an assisting tool body 1 and a columnar connecting tool 2. The auxiliary tool body 1 has a columnar shaft portion 1a, an insertion end portion 1b, and a recess 1c. The shaft portion 1a has an outer diameter D1 that can be inserted into the first through hole 71h and the second through hole 72h (see FIG. 1). The insertion end 1b is formed at the distal end of the shaft 1a and is reduced in diameter toward the distal end of the shaft 1a. The recess 1c is recessed in the axial direction so that the tip of the cotter 8 can be fitted. The auxiliary tool body 1 is preferably made of an aluminum alloy or the like.

  Referring to FIGS. 1 to 3, the connector 2 has a second shaft portion 2a formed at one end and a tab 2b protruding from the other end. The second shaft portion 2 a can be fitted into the recess 1 c of the auxiliary tool body 1. The tab 2b has an attachment hole 21b at the end. One end of the first string 21 is inserted into the attachment hole 21b, and one end of the first string 21 is anchored to the connector 2 (see FIG. 1). With reference to FIG. 1, the auxiliary tool 10 can be prevented from falling if the other end portion of the first string 21 is tethered to an operator or the like in a state where the connecting tool 2 is connected to the auxiliary tool body 1.

  Referring to FIGS. 1 to 3, the cotter 8 includes a cylindrical shaft portion 8 a and a flange portion 8 b provided at the base end portion of the shaft portion 8 a. Further, the flange portion 8b has a pair of flat end portions 81b and 81b in which a part of the outer periphery is cut out so as to have the same width as the outer diameter of the shaft portion 8a. As a result, when the cotter 8 is inserted into or removed from the first through hole 71h and the second through hole 72h, the flange 8b is unlikely to come into contact with the flange 7a (see FIG. 11) protruding in a wave shape on the bottom surface of the main body 70. . Further, the cotter 8 has a first insertion hole 81a for inserting the split pin 8p for preventing the drop off, opened on the tip end side of the shaft portion 8a.

  Referring to FIG. 2 or FIG. 3, the recess 1 c of the auxiliary tool body 1 has a pair of hemispherical protrusions 1 d and 1 d. These protrusions 1d and 1d protrude from the inner wall of the recess 1c so as to face each other. And a pair of protrusion 1d * 1d can be fitted to the opening end of the 1st penetration hole 81a of the cotter 8 (refer FIG.3 (D)).

  2 or 3, the second shaft portion 2 a of the connector 2 has a second insertion hole 21 a penetrating in the outer peripheral direction at the end portion. If the 2nd axial part 2a is inserted in the recessed part 1c, the opening end of the 2nd penetration hole 21a can be fitted to a pair of protrusion 1d * 1d.

  Referring to FIG. 2 or FIG. 3, the shaft portion 8a of the cotter 8 can be inserted into the recess 1c and held by the pair of protrusions 1d and 1d, and the second shaft portion 2a of the connector 2 can be held. Can be inserted and held by the pair of protrusions 1d and 1d. In order to facilitate the insertion of the shaft portion 8a of the cotter 8 or the second shaft portion 2a of the connector 2, the recess 1c is provided with a pair of slits 1s and 1s.

  Referring to FIG. 1, the first through hole 71h that penetrates the first support portion 71 and the second through hole 72h that penetrates the second support portion 72 are aligned with each other, and the insertion end portion 1b is used as the first. The shaft portion 1a can be inserted into the through hole 71h and the second through hole 72h. The insertion length L of the shaft portion 1a is defined so that the shaft portion 1a extends from both end faces of the first support portion 71 (see FIG. 5).

  Referring to FIGS. 1 to 3, the auxiliary tool body 1 has a hole portion 11 b penetrating in the outer peripheral direction in the insertion end portion 1 b. One end of the second string 12 can be inserted into the hole 11b and the one end of the second string 12 can be anchored to the auxiliary tool body 1 (see FIG. 6).

  With reference to FIG. 1 to FIG. 3, the auxiliary tool is pulled from the first through hole 71 h and the second through hole 72 h by pulling the second string 12 in a state where the cotter 8 is connected to the recess 1 c of the auxiliary tool body 1. The main body 1 can be pulled out so that it can pass through (see FIG. 9). Referring to FIG. 10, if the other end of the second string 12 is tethered to an operator or the like, the auxiliary tool body 1 can be prevented from falling.

[Action of cotter insertion aid]
Next, the operation and effect of the auxiliary tool 10 according to the embodiment will be described while explaining a procedure for connecting the pair of hanging insulators 7 and 7.

  FIG. 4 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram immediately before inserting the cotter insertion assisting tool into a set of hanging insulators. FIG. 5 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram in which the cotter insertion assisting tool is inserted into a set of hanging insulators. FIG. 6 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram in which a second string body is tethered to the assisting tool body. FIG. 7 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram in which the connecting tool is removed from the assisting tool body.

  FIG. 8 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram before the cotter is inserted into the assisting tool body. FIG. 9 is a front view of the cotter insertion assisting device according to the embodiment, and is a state diagram in which the cotter is inserted into the assisting device body. FIG. 10 is a front view of the cotter insertion assisting tool according to the embodiment, and is a state diagram in which the assisting tool main body is removed from the cotter.

  Referring to FIG. 4, first, in a state where the first string body 21 is anchored to the connector 2, the second shaft portion 2 a of the connector 2 is inserted into the recess 1 c of the auxiliary device body 1, and the assist device main body is inserted. 1 and the connector 2 are connected (first step). In this case, if the other end part of the 1st string 21 is tethered to an operator etc., fall of the auxiliary tool 10 can be prevented.

  Next, referring to FIG. 5, the first through hole 71 h that penetrates the first support portion 71 and the second through hole 72 h that penetrates the second support portion 72 are aligned with each other so that the auxiliary tool body 1 and the connecting tool are aligned. In a state where the two are connected, the insertion end 1b is placed at the top and the first through hole 71h and the second through hole 72h are inserted (second step).

  Referring to FIG. 5, the insertion end 1b is reduced in diameter toward the tip of the first shaft portion 1a, so that it can be easily inserted into the first through hole 71h and the second through hole 72h. Moreover, it is preferable to insert the auxiliary tool main body 1 to such an extent that the shaft portion 1 a extends from both end faces of the first support portion 71.

  Next, referring to FIG. 6, the second string body 12 is tethered to the insertion end 1 b in a state where the insertion end 1 b protrudes from one end face of the first support 71 (third process). Specifically, one end of the second string 12 is inserted into the hole 11b, and the one end of the second string 12 is anchored to the auxiliary tool body 1 (see FIG. 2 or FIG. 3).

  Next, referring to FIG. 7, the second string body 12 is held and the first string body 21 is pulled to remove the connector 2 from the auxiliary tool body 1 (fourth step). In the state shown in FIG. 7, if the other end of the first string 21 is anchored to an operator or the like, the connector 2 can be prevented from falling. Further, in the state shown in FIG. 7, the auxiliary tool main body 1 holds the state in which the first through hole 71 h and the second through hole 72 h are matched.

  Next, referring to FIG. 8, the shaft portion 8 a of the cotter 8 is entered with the shaft portion 8 a at the head toward the concave portion 1 c of the auxiliary tool body 1 (see FIG. 2C or FIG. 3C). ). In this case, it is preferable to arrange the auxiliary tool main body 1 at a position where the projection 1d can be viewed from the front so that the flange portion 8b of the cotter 8 does not contact the flange 7a.

  Next, referring to FIG. 9, the tip of the cotter 8 is inserted into the recess 1 c of the auxiliary tool body 1, and as shown in FIG. 2D or FIG. 1d is fitted into the first insertion hole 81a (fifth step). In the state shown in FIG. 9, since the pair of protrusions 1 d and 1 d are fitted in the first insertion hole 81 a, the cotter 8 can be moved together with the auxiliary tool body 1 by pulling the second string body 12.

  Next, referring to FIG. 10, the second cord body 12 is pulled and the auxiliary tool main body 1 and the cotter 8 are moved until the collar portion 8 b comes into contact with the other end surface of the first support portion 71 (sixth sixth embodiment). Process). Next, in a state where the collar portion 8b is in contact with the other end surface of the first support portion 71, the second string body 12 is pulled and the auxiliary tool body 1 is removed from the cotter 8 (seventh step). In this case, since the one end part of the 2nd string body 12 is tethered to the auxiliary tool main body 1, if the other end part of the 2nd string body 12 is tethered to a worker etc., the auxiliary tool main body 1 Can prevent falling or loss.

  In the process from the state shown in FIG. 9 to the state shown in FIG. 10, the cotter 8 may be pushed while the auxiliary tool body 1 is pulled out by the second string body 12, and the first through hole 71h and the second through hole 72h. The cotter 8 can be easily entered.

  The auxiliary tool 10 according to the embodiment includes an auxiliary tool body 1 having a concave portion 1c that is recessed in the axial direction so that the tip of the cotter 8 can be fitted, and a second shaft portion 2a that can be fitted into the concave portion 1c of the auxiliary tool body 1. The recess 1c of the auxiliary tool body 1 protrudes from the inner wall so as to face each other, and is provided at the opening end of the first insertion hole 81a of the cotter 8 or the second shaft portion 2a. Since the pair of hemispherical projections 1d and 1d that can be fitted to the opening end of the second insertion hole 21a are provided, the cotter 8 can be easily inserted into the clevis-shaped through hole.

  Moreover, since the auxiliary tool 10 by embodiment has the 1st string body 21 anchored to the connection tool 2, and the 2nd string body 12 can be anchored to the auxiliary tool main body 1, the connection tool 2 and the auxiliary tool main body 1 Can be prevented from falling. The cotter insertion method according to the present invention can easily connect a plurality of hanging insulators 7 having the first support portion 71 at the upper portion and the second support portion 72 at the lower portion (FIG. 1). And the operation | work which connects the some suspension insulator 7 can be implemented safely and efficiently.

  Although the cotter insertion aid according to the present invention discloses a useful embodiment for connecting a lever having a clevis-type support portion to a support member with a cotter, the present invention is not limited thereto. The cotter insertion aid according to the present invention can be applied when an actuator such as a cylinder having a clevis-type support portion is connected to a support member with a cotter, and can be applied not only to electrical work but also to assembly work of a machine. Can be wide.

DESCRIPTION OF SYMBOLS 1 Auxiliary tool main body 1a 1st axial part 1b Insertion end part 1c Recessed part 1d / 1d A pair of protrusion 2 Connecting tool 2a 2nd axial part 8 Cotter 8b Eaves part 8p Split pin 10 Auxiliary tool (cotter insertion auxiliary tool)
21 1st string 21a 2nd insertion hole 71 1st support part 71h 1st through hole 72 2nd support part 72h 2nd through hole

Claims (2)

In order to connect the double clevis-type first support portion and the single-clevis-type second support portion in a swingable manner, the first through-hole penetrating the first support portion and the second support portion are penetrated. A cylindrical cotter having a first insertion hole at the distal end portion through which the second through hole is matched and has a hook portion for retaining at the base end portion and a split pin can be inserted from the outer peripheral direction is inserted. An auxiliary cotter insertion aid,
A cylindrical first shaft portion having an outer diameter that can be inserted into the first through hole and the second through hole, an insertion end portion that is reduced in diameter toward a tip portion of the first shaft portion, and the first shaft An auxiliary tool body having a recessed portion that is formed in the base end portion of the portion and recessed in the axial direction so that the tip end portion of the cotter can be fitted,
A columnar connector having a second shaft portion that can be fitted into the concave portion of the auxiliary device main body at one end portion, and a first string body for preventing the drop being anchored to the other end portion;
The recess of the auxiliary tool body has a pair of hemispherical protrusions that protrude from the inner wall so as to face each other and can be fitted to the opening end of the first insertion hole of the cotter,
The second shaft portion of the connector has a second insertion hole penetrating in the outer peripheral direction at the end portion,
The opening end of the second insertion hole can be fitted to the pair of protrusions ,
The auxiliary tool main body has a hole portion capable of tethering a second string for pulling out the auxiliary tool main body from the first through hole and the second through hole in a state where the cotter is connected to the recess. A cotter insertion aid having the insertion end . In order to connect the double clevis-type first support portion and the single-clevis-type second support portion in a swingable manner, the first through-hole penetrating the first support portion and the second support portion are penetrated. A cylindrical cotter having a first insertion hole at the distal end portion through which the second through hole is matched and has a hook portion for retaining at the base end portion and a split pin can be inserted from the outer peripheral direction is inserted. A cotter insertion method for inserting the cotter into the first through hole and the second through hole using an auxiliary cotter insertion assist tool,
The cotter insertion aid is
A cylindrical first shaft portion having an outer diameter that can be inserted into the first through hole and the second through hole, an insertion end portion that is reduced in diameter toward a tip portion of the first shaft portion, and the first shaft An auxiliary tool body having a recessed portion that is formed in the base end portion of the portion and is recessed in the axial direction so that the distal end portion of the cotter can be fitted;
A columnar connector having a second shaft portion that can be fitted into the concave portion of the auxiliary device main body at one end portion, and a first string body for preventing the drop being anchored to the other end portion;
The recess of the auxiliary tool body has a pair of hemispherical protrusions that protrude from the inner wall so as to face each other and can be fitted to the opening end of the first insertion hole of the cotter,
The second shaft portion of the connector has a second insertion hole whose open end can be fitted into the pair of protrusions,
The auxiliary tool main body has a hole portion capable of tethering a second string for pulling out the auxiliary tool main body from the first through hole and the second through hole in a state where the cotter is connected to the recess. At the insertion end,
A first step of connecting the auxiliary tool body and the connecting tool by inserting the second shaft portion into the recess of the auxiliary tool body in a state where the first string body is anchored to the connecting tool;
A second step of inserting into the first through hole and the second through hole with the insertion end portion at the top in a state where the auxiliary tool body and the connector are connected;
A third step of tethering the second string body to the insertion end in a state where the insertion end protrudes from one end face of the first support;
A fourth step of holding the second string body and pulling the first string body to remove the coupling tool from the auxiliary tool body;
A fifth step of inserting the tip of the cotter into the recess of the auxiliary tool body and fitting the pair of protrusions into the first insertion hole;
A sixth step of moving the auxiliary tool main body and the cotter by pulling the second string body until the collar portion comes into contact with the other end face of the first support portion;
A seventh step of removing the auxiliary tool main body from the cotter by pulling the second string body in a state in which the collar portion is in contact with the other end surface of the first support portion, and a cotter insertion method including the cotter .

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