JP2022177277A - stud pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positional accuracy of components mounted on both surfaces of a fastened member.

SOLUTION: A stud pin comprises: a first shaft portion that extends in a first direction; a first flange portion that is provided coaxially with the first shaft portion at one end portion of the first shaft portion; a second flange portion that is provided coaxially with the first flange portion on the opposite side to a surface on which the first shaft portion of the first flange portion is provided, and is larger than the first flange portion; and a second shaft portion that is provided coaxially with the second flange portion on a surface on the opposite side to a surface on which the first flange portion is provided of the second flange portion, and extends in a second direction opposite to the first direction. The second flange portion has a first groove portion formed in a circumferential direction on the surface on which the first flange portion is provided.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to stud pins.

Stud pins are crimped and fixed to a plate-shaped sheet metal or the like, and the shafts of the stud pins are used for positioning when mounting components such as substrates on the sheet metal.

Japanese Patent No. 4133813

Stud pins typically have only one shaft extending from the flange in one direction. Therefore, stud pins can only be used for positioning parts mounted on one side of the sheet metal. Therefore, it is necessary to arrange two stud pins in order to position the parts to be mounted on the other surface of the sheet metal. However, if two stud pins are used to position the parts on both sides of the sheet metal, the positional accuracy of the parts on both sides may deteriorate.

The present invention provides a stud pin capable of improving the positional accuracy of parts mounted on both sides of a member to be fastened.

The stud pin of the present invention comprises: a first shaft portion extending in a first direction; a first flange portion provided coaxially with the first shaft portion at one end of the first shaft portion; a second flange portion larger than the first flange portion provided coaxially with the first flange portion on the opposite side of the surface of the first flange portion on which the first shaft portion is provided; provided coaxially with the second flange portion and extending in a second direction opposite to the first direction on the surface of the flange portion opposite to the surface on which the first flange portion is provided and a second shaft portion, wherein the second flange portion has a first groove portion formed along the circumferential direction on the surface on which the first flange portion is provided.

ADVANTAGE OF THE INVENTION According to this invention, the positional accuracy of components mounted on both surfaces of a to-be-fastened member can be improved.

FIG. 1 is a schematic front view showing the configuration of a stud pin according to an embodiment of the invention. FIG. 2 is a schematic perspective view showing the configuration of the stud pin according to the embodiment of the present invention. FIG. 3A is a schematic diagram for explaining an example of a member to be fastened. FIG. 3B is a schematic diagram for explaining an example of a member to be fastened. FIG. 4 is a schematic diagram for explaining an example of the crimping method according to the embodiment of the present invention. FIG. 5 is a schematic diagram for explaining an example of the positioning method according to this embodiment. FIG. 6 is a schematic perspective view showing an example of the configuration of the first modified example of the stud pin according to the embodiment of the present invention. FIG. 7A is a schematic diagram for explaining an example of a method of fixing a stud pin to a sheet metal according to the first modified example; FIG. 7B is a schematic diagram for explaining an example of a method of fixing the stud pin to the sheet metal according to the first modified example. FIG. 8 is a schematic perspective view showing an example of the configuration of a second modified example of the stud pin according to the embodiment of the present invention. FIG. 9A is a schematic diagram for explaining an example of a method of fixing a stud pin to a sheet metal according to a second modification; FIG. 9B is a schematic diagram for explaining an example of a method of fixing the stud pin to the sheet metal according to the second modification. It is a perspective schematic diagram which shows an example of a structure of the 3rd modification of the stud pin which concerns on embodiment of this invention. It is a perspective schematic diagram which shows an example of a structure of the 4th modification of the stud pin which concerns on embodiment of this invention.

DETAILED DESCRIPTION OF THE INVENTION Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and when there are a plurality of embodiments, a combination of each embodiment is also included.

In the following, an XYZ orthogonal coordinate system is set and the present invention is described using the XYZ orthogonal coordinate system.
The direction parallel to the X axis in the horizontal plane is the X direction, the direction parallel to the Y axis in the horizontal plane perpendicular to the X axis is the Y direction, and the direction parallel to the Z axis perpendicular to the horizontal plane is the Z direction. The X direction is the horizontal direction,
The Y direction is sometimes called the front-rear direction, and the Z direction is sometimes called the vertical direction.
[Embodiment]
A configuration of a stud pin according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a schematic front view showing the configuration of a stud pin according to an embodiment of the invention. Figure 2
1] is a schematic perspective view showing the configuration of a stud pin according to an embodiment of the present invention. [FIG.

The stud pin 1 has a first shaft portion 10 , a flange portion 20 and a second shaft portion 30 . The stud pin 1 is crimped and fixed to a member to be fastened (for example, sheet metal). The stud pin 1 is used to position a component (for example, a substrate) to be mounted on a member to be fastened.

The stud pin 1 is made of metal, for example. The stud pin 1 may be made of resin, for example. The first shaft portion 10, the flange portion 20, and the second shaft portion 30 are integrally formed. For example, the first shaft portion 10, the flange portion 20, and the second shaft portion 30 are integrally formed with the axis O as the same central axis.

The first shaft portion 10 is a shaft extending in the +Z direction (first direction) from the flange portion 20 . The first shaft portion 10 has a tip portion 10a at the end portion on the +Z direction side. The tip portion 10a has a truncated cone shape that gradually tapers in the +Z direction. Tip 10a
, the first shaft portion 10 can be easily inserted into the insertion hole formed in the member to be fastened, but this may be omitted. The first shaft portion 10 has a first flange portion 21 of the flange portion 20 at the end on the -Z direction side.

The flange portion 20 has a first flange portion 21 and a second flange portion 22 . That is, the flange portion 20 is a double flange portion.

As shown in FIG. 2, the first flange portion 21 has, for example, a columnar shape extending on the XY plane with the axis O as the center. The distance from the axis O to the outer edge of the first flange portion 21 is longer than the distance from the axis O to the outer edge of the first shaft portion 10 . The first flange portion 21 has a size that allows it to be inserted through an insertion hole provided in a member to be fastened through which the first shaft portion 10 is inserted when the stud pin 1 is fixed to the member to be fastened. For example, the first flange portion 21 has substantially the same size as the insertion hole. The first flange portion 21 has a second flange portion 22 on the −Z direction side opposite to the +Z direction side surface having the first shaft portion 10 . The first flange portion 21 is formed thicker than the member to be fastened.

As shown in FIG. 2, the second flange portion 22 has, for example, a columnar shape centered on the axis O and extending on the XY plane. The distance from the axis O to the outer edge of the second flange portion 22 is longer than the distance from the axis O to the outer edge of the first flange portion 21 . That is, the second flange portion 22 is larger than the first flange portion 21 . Specifically, the second flange portion 22 is formed larger than the insertion hole. Therefore, in order to fix the stud pin 1 to the member to be fastened, the first shaft portion 1
0 is inserted into the shaft insertion hole, the second flange portion 22 prevents further entry. The second flange portion 22 has a second shaft portion 30 on the −Z direction side surface opposite to the +Z direction side surface having the first flange portion 21 .

The second shaft portion 30 is a shaft extending from the flange portion 20 in the −Z direction (second direction). The second shaft portion 30 has a tip portion 30a at the end portion on the -Z direction side. The tip portion 30a has a truncated cone shape that gradually tapers in the -Z direction. tip 30a
, the second shaft portion 30 can be easily inserted into the insertion hole, but may be omitted.
That is, the second shaft portion 30 has the same shape as the first shaft portion 10 .

A member to be fastened according to an embodiment of the present invention will be described with reference to FIGS. 3A and 3B. 3A and 3B are schematic diagrams for explaining an example of a member to be fastened according to an embodiment of the present invention.

As shown in FIG. 3A, the member to be fastened according to the present embodiment is a plate-shaped sheet metal 40 . The sheet metal 40 has parts such as substrates arranged on both the surface 40a and the back surface of the surface 40a. The sheet metal 40 has an insertion hole 41 through which the first shaft portion 10 of the stud pin 1 is inserted.

The insertion hole 41 has a size through which the first flange portion 21 can pass and a size through which the second flange portion 22 cannot pass. Therefore, when the first shaft portion 10 is inserted through the insertion hole 41 , the first flange portion 21 passes through the insertion hole 41 , but the second flange portion 22 does not pass through the insertion hole 41 . That is, the second flange portion 22 restricts movement of the stud pin 1 in the insertion direction with respect to the insertion hole 41 .

FIG. 3B shows how the stud pin 1 is inserted through the insertion hole 41 of the metal plate 40 . In FIG. 3B, the first shaft portion 10 of the stud pin 1 is inserted from the back side of the surface 40a.
Thereby, the first shaft portion 10 and the first flange portion 21 are exposed on the surface 40a.
In this embodiment, the stud pin 1 is fixed to the sheet metal 40 by crimping the first flange portion 21 in the state shown in FIG. 3B.

A crimping method according to this embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram for explaining an example of the crimping method according to this embodiment. FIG. 4 schematically shows cross sections of the stud pin 1 , the sheet metal 40 , the support jig 50 and the caulking jig 60 .

The support jig 50 supports the second flange portion 22 from below, thereby maintaining the state in which the first shaft portion 10 and the first flange portion 21 are inserted through the insertion hole 41 of the metal plate 40 . It is a tool.

The crimping jig 60 crimps the first flange portion 21 to attach the stud pin 1 to the sheet metal 40 .
It is a jig for fixing to The crimping jig 60 has a blade for crimping the first flange portion 21 at the tip portion 60a. The crimping jig 60 has a space for accommodating the first shaft portion 10 when crimping the first flange portion 21 . With the blade of the tip portion 60a in contact with the first flange portion 21, the user strikes the caulking jig 60 from above or presses it in the -Z direction, thereby moving the blade of the tip portion 60a to -Z direction. direction to crimp the first flange portion 21 . The crimping jig 60 may be of a screw type in which the blade of the tip portion 60a moves in the −Z direction while rotating on the XY plane to crimp the first flange portion 21. FIG.

In the crimping method according to this embodiment, first, the first shaft portion 10 is inserted into the insertion hole 41 of the sheet metal 40 .
and the first flange portion 21 are inserted, the second flange portion 2 is supported by the support jig 50
2. As a result, the support jig 50 maintains the state in which the first shaft portion 10 and the first flange portion 21 are inserted through the metal plate 40 .

Next, a crimping jig 60 for crimping the first flange portion 21 is installed. In particular,
While accommodating the first shaft portion 10 in the space for accommodating the first shaft portion 10, the distal end portion 6
A crimping jig 60 is installed from above the first shaft portion 10 so that the blade 0a and the first flange portion 21 are in contact with each other.

Next, the first flange portion 21 is crimped by moving the blade of the tip portion 60a of the crimping jig 60 in the -Z direction to bite into the first flange portion 21 . The stud pin 1 is thereby fixed to the metal plate 40 .

A positioning method according to this embodiment will be described with reference to FIG. FIG. 5 is a schematic diagram for explaining an example of the positioning method according to this embodiment.

5 shows the state after the stud pin 1 is fixed to the metal plate 40. FIG. The first shaft portion 10 and the second shaft portion 30 are used for positioning parts mounted on the sheet metal.

The first shaft portion 10 is used for positioning when mounting the first substrate 70 on one surface 40 a of the metal plate 40 . In this case, the first substrate 70 is provided with a positioning hole 71, and when the first substrate 70 is mounted on the surface 40a, the first shaft portion 10 is inserted through the positioning hole 71 for positioning. Then, with the first shaft portion 10 inserted into the positioning hole 71, the first substrate 70 is attached to the surface 4 by screws 72 and a plurality of other screws (not shown).
0a.

The second shaft portion 30 is used for positioning when the second substrate 80 is mounted on the other surface 40 b of the metal plate 40 . In this case, the second substrate 80 is provided with a positioning hole 81, and when the second substrate 80 is mounted on the surface 40b, the second shaft portion 30 is inserted through the positioning hole 81 for positioning. Then, with the second shaft portion 30 inserted into the positioning hole 81, the second substrate 80 is attached to the surface 4 by screws 82 and a plurality of other screws (not shown).
0b.

As described above, in the present embodiment, substrates mounted on both sides of the metal plate 40 can be positioned by using only one stud pin 1 . Therefore, this embodiment is advantageous in terms of cost compared to the conventional art.

In this embodiment, the first shaft portion 10 and the second shaft portion 30 of the stud pin 1 are integrally formed with the same axis O as the central axis. Therefore, positioning using the stud pins 1 improves the positional accuracy of the first substrate 70 mounted on the surface 40a and the second substrate 80 mounted on the surface 40b.
[First Modification]
A configuration of a stud pin 1A according to a first modification of the stud pin 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic perspective view showing an example of the configuration of a stud pin 1A according to a first modified example of the stud pin 1 according to the embodiment of the invention.

As shown in FIG. 6, the stud pin 1A differs from the stud pin 1 according to the embodiment of the present invention in that the second flange portion 22 has the first groove portion 23. As shown in FIG.

The first groove portion 23 is formed on the surface of the second flange portion 22 having the first flange portion 21 . The first groove portion 23 is an annular groove portion formed along the circumferential direction of the second flange portion 22 over one circumference. The first groove portion 23 is formed, for example, along the first flange portion 21 over one week of the second flange portion 22 . The first groove portion 23 is a groove for embedding the metal plate 40 by crimping the metal plate 40 when fixing the stud pin 1A to the metal plate 40 .

A method of fixing the stud pin 1A to the sheet metal 40 will be described with reference to FIGS. 7A and 7B. 7A and 7B are schematic diagrams for explaining an example of a method for fixing the stud pin 1A to the metal plate 40. FIG. In FIG. 7A, the stud pin 1, the sheet metal 40, and the support jig 50
, and a crimping jig 60A. In FIG. 7B, the stud pin 1 and
Cross sections of the sheet metal 40, the support jig 50, and the caulking jig 60B are schematically shown.

As shown in FIGS. 7A and 7B, the stud pin 1A is fixed to the sheet metal 40 using a crimping jig 60A and a crimping jig 60B.

The crimping jig 60A is a jig for crimping the sheet metal 40 . The caulking jig 60A has a blade for caulking the sheet metal 40 at the tip portion 60Aa. The caulking jig 60A has a space for accommodating the first shaft portion 10 when the sheet metal 40 is caulked. Since the blade of the tip portion 60Aa of the crimping jig 60A contacts the sheet metal 40, the first shaft portion 10
is wider than the space of the crimping jig 60 according to the embodiment described above. The method of crimping the sheet metal 40 with the crimping jig 60A is the same as the method of crimping the first flange portion 21 with the crimping jig 60 according to the above-described embodiment, so description thereof will be omitted.

The crimping jig 60B crimps the sheet metal 40 with the crimping jig 60A, and then the first flange portion 21
It is a jig for caulking. The crimping jig 60B has the same configuration as the crimping jig 60 according to the embodiment described above. The method of crimping the first flange portion 21 with the crimping jig 60B is the same as the method of crimping the first flange portion 21 with the crimping jig 60 according to the above-described embodiment, so description thereof will be omitted.

In the crimping method according to the first modification, first, the first shaft portion 10 is inserted into the insertion hole 41 of the sheet metal 40.
and the first flange portion 21 are inserted, the second flange portion 2 is supported by the support jig 50
2 to maintain the state in which the first shaft portion 10 and the first flange portion 21 are inserted through the metal plate 40 .

Next, a crimping jig 60A for crimping the sheet metal 40 is installed. Specifically, while the first shaft portion 10 is accommodated in a space capable of accommodating the first shaft portion 10, the first shaft portion 10 is crimped from above so that the blade of the tip portion 60Aa and the sheet metal 40 are in contact with each other. A jig 60A is installed.

Next, the tip 60Aa of the crimping jig 60A is moved in the -Z direction to move the blade to the sheet metal 4.
The sheet metal 40 is crimped by making it bite into 0. Specifically, the sheet metal 40 is crimped to embed the sheet metal 40 in the first groove portion 23 . Therefore, the blade of the tip portion 60</b>Aa may be inclined toward the direction of the first groove portion 23 in order to facilitate the embedding of the sheet metal 40 in the first groove portion 23 .

Next, the crimping jig 60A is removed and a crimping jig 60B for crimping the first flange 21 is installed. Specifically, while the first shaft portion 10 is accommodated in a space capable of accommodating the first shaft portion 10, the first shaft portion 10 is crimped from above so that the blade of the tip portion 60Aa and the sheet metal 40 are in contact with each other. A jig 60B is installed.

Next, the caulking jig 60B moves the tip 60Ba in the -Z direction to bite the blade into the first flange. The first flange portion 21 is crimped. As a result, the stud pin 1A is fixed to the metal plate 40. As shown in FIG.

As described above, in the first modification, the sheet metal 40 is crimped with the crimping jig 60A to embed the sheet metal 40 in the first groove portion 23, and then the first flange portion 21 is crimped with the crimping jig 60B to form the stud. The pin 1A is fixed to the metal plate 40. - 特許庁That is, in the first modified example, the stud pin 1A is fixed to the sheet metal 40 by two caulking processes. As a result, the first modification is
Since the stud pin 1A is fixed to the metal plate 40 by the first flange portion 21 and the metal plate 40, the fixing strength can be further improved.
[Second Modification]
A configuration of a stud pin 1B according to a second modification of the stud pin 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic perspective view showing an example of the configuration of a stud pin 1B according to a second modified example of the stud pin 1 according to the embodiment of the invention.

As shown in FIG. 8 , the stud pin 1B differs from the stud pin 1 according to the embodiment of the present invention in that the first flange portion 21 has the second groove portion 24 .

The second groove portion 24 is formed on the side surface of the first flange portion 21 . Specifically, the second groove portion 24 is a groove portion formed on the side surface of the first flange portion 21 over a circumference. Second groove portion 24
is formed around the side surface of the first flange portion 21 along, for example, the second flange portion 22 . The second groove portion 24 is a groove for embedding the metal plate 40 by crimping the metal plate 40 when fixing the stud pin 1A to the metal plate 40 . The height of the second groove portion 24 in the Z direction is smaller than the thickness of the member to be fastened.

A method of fixing the stud pin 1B to the metal plate 40 will be described with reference to FIGS. 9A and 9B. 9A and 9B are schematic diagrams for explaining an example of a method of fixing the stud pin 1A to the metal plate 40. FIG. In FIG. 9A, the stud pin 1, the sheet metal 40, and the support jig 50
, and a crimping jig 60A. In FIG. 9B, stud pin 1 and
Cross sections of the sheet metal 40, the support jig 50, and the caulking jig 60B are schematically shown.

The crimping method according to the second modification is to attach the first shaft portion 10 and the first flange portion 2 to the sheet metal 40.
Since the method from inserting 1 to installing the crimping jig 60A is the same as the crimping method according to the first modification, the description is omitted.

Next, the tip 60Aa of the crimping jig 60A is moved in the -Z direction to move the blade to the sheet metal 4.
The sheet metal 40 is crimped by making it bite into 0. Specifically, the sheet metal 40 is crimped to embed the sheet metal 40 in the second groove portion 24 . Therefore, the blade of the tip portion 60</b>Aa may be inclined toward the second groove portion 24 in order to facilitate the embedding of the sheet metal 40 in the second groove portion 24 . In this case, since the second groove portion 24 is provided on the side surface of the first flange portion 21, the direction of the blade is parallel to the XY plane compared to the first modification.

The method for crimping the first flange portion 21 after crimping the sheet metal 40 is the same as in the first modified example, so the description is omitted.

As described above, in the second modification, the sheet metal 40 is crimped with the crimping jig 60A to embed the sheet metal 40 in the second groove portion 24, and then the first flange portion 21 is crimped with the crimping jig 60B to form the stud. The pin 1B is fixed to the metal plate 40. - 特許庁That is, in the second modification, the stud pin 1B is fixed to the sheet metal 40 by two caulking processes. As a result, the second modification is
Since the stud pin 1B is fixed to the metal plate 40 by the first flange portion 21 and the metal plate 40, the fixing strength can be further improved.
[Third modification]
A configuration of a stud pin 1C according to a third modification of the stud pin 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 10 is a schematic perspective view showing an example of the configuration of a stud pin 1C according to a third modified example of the stud pin 1 according to the embodiment of the invention.

The stud pin 1C has a shaft portion 10A and a flange portion 20. As shown in FIG. Flange 2
A first groove portion 23 is formed in the second flange portion 22 of 0.

When the first groove portion 23 is formed in the second flange portion 22 as in the first modified example described above, the number of shaft portions may be one. The stud pin 1C has a shape in which the first shaft portion 10 of the stud pin 1A according to the first modified example is omitted. That is, the shaft portion 1
0A corresponds to the second shaft portion 30 of the stud pin 1A according to the first modification.

The stud pin 1C can be fixed to the sheet metal 40 by the crimping method according to the first modification described with reference to FIGS. 7A and 7B. Specifically, only the first flange portion 21 is inserted into the insertion hole 41 of the sheet metal 40, and the first shaft portion 10 of the stud pin 1A is accommodated and crimped by the crimping jigs 60A and 60B. The method is the same as described in FIGS. 7A and 7B, except for the points.

The stud pin 1</b>C according to the third modification can be used for positioning when mounting a component such as a substrate on only one side of the metal plate 40 , for example.
[Fourth Modification]
A configuration of a stud pin 1D according to a third modification of the stud pin 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 11 is a schematic perspective view showing an example of the configuration of a stud pin 1D according to a fourth modified example of the stud pin 1 according to the embodiment of the invention.

Stud pin 1</b>D has shaft portion 10</b>A and flange portion 20 . Flange 2
A second groove portion 24 is formed in the first flange portion 21 of 0.

When the second groove portion 24 is formed in the first flange portion 21 as in the second modified example described above, the number of shaft portions may be one. The stud pin 1D has a shape in which the first shaft portion 10 of the stud pin 1B according to the second modification is omitted.

The stud pin 1D can be fixed to the sheet metal 40 by the caulking method according to the second modification described with reference to FIGS. 9A and 9B. Specifically, only the first flange portion 21 is inserted into the insertion hole 41 of the sheet metal 40, and the first shaft portion 10 of the stud pin 1A is accommodated and crimped by the crimping jigs 60A and 60B. The method is the same as described in FIGS. 9A and 9B, except for the points.

The stud pin 1D according to the fourth modification can be used for positioning when mounting a component such as a substrate on only one side of the metal plate 40, for example.

Although the embodiments of the present invention have been described above, the embodiments are not limited by the contents of these embodiments. In addition, the components described above include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within the so-called equivalent range. Furthermore, the components described above can be combined as appropriate. Furthermore, various omissions, replacements, or modifications of components can be made without departing from the gist of the above-described embodiments.

In an embodiment of the invention, the first shaft portion 10, the flange portion 20 and the second shaft portion 3
0 is described as coaxially formed with the axis 0 as the central axis, but the first shaft portion 10 and the second shaft portion 30 may be eccentric from the axis O. In this case, the first shaft portion 10 and the second shaft portion 30 may have different eccentric positions. As a result, the first shaft portion 10 can be formed so that the first shaft portion 10 can be inserted through the insertion hole 41 even if there is a restriction on the position where the insertion hole 41 is provided in the metal plate 40 . As a result, the stud pin 1 can be crimped and fixed to the sheet metal 40 . this is,
The same applies to each modification.

Reference Signs List 1, 1A, 1B, 1C, 1D stud pin 10 first shaft portion 10A shaft portion 20 flange portion 21 first flange portion 22 second flange portion 23 first groove portion 24 second groove portion 30 second shaft portion 40 sheet metal 50 support jig Tool 60, 60A, 60B Crimping jig

Claims (2)

a first shaft portion extending in a first direction;
a first flange portion provided coaxially with the first shaft portion at one end of the first shaft portion;
a second flange portion larger than the first flange portion provided coaxially with the first flange portion on the opposite side of the surface of the first flange portion on which the first shaft portion is provided;
On the surface opposite to the surface on which the first flange portion of the second flange portion is provided,
a second shaft portion provided coaxially with the second flange portion and extending in a second direction opposite to the first direction;
with
The second flange portion has a first groove portion formed along the circumferential direction on the surface on which the first flange portion is provided,
stud pin. The first flange portion has a size that allows it to be inserted into an insertion hole of a member to be fastened that is inserted from the other end of the first shaft portion,
The second flange portion has a shape larger than the hole of the member to be fastened,
The stud pin according to claim 1.

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