JP3445772B2 - Flange plate mounting structure to gas tap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting a flange plate on a gas plug, and more particularly to a mounting structure for mounting a flange plate having a bolt insertion hole for mounting on a wall surface to a pipe connection portion of the gas plug. .

[0002]

2. Description of the Related Art In a gas plug of a type which is connected to a flexible pipe housed in a wall, a pipe connecting portion for connecting the flexible pipe of the gas plug main body is opened in order to attach the gas plug main body to a wall surface. A flange plate is provided near the end.

The flange plate (1) has a fixing bolt (22
a) Bolt insertion holes (11a) (11b) for inserting (22b)
Is installed, and these fixing bolts (22a) (22b)
Screw it directly into (3) or, as shown in FIG. 9, use a U-shaped or horseshoe-shaped pad plate (31) and screw it into the screw holes (32a) (32b) provided in it. Combine the wall (3) with the flange plate
The gas plug can be attached to the wall (3) depending on whether it is fixed by sandwiching it between the (1) and the backing plate (31).

The flange plate (1) is attached to the pipe connection portion (20) of the gas plug so that the bolt insertion holes (11a) (11b) have a fixed positional relationship with the gas plug body (2). As a mounting structure, there is one disclosed in Japanese Utility Model Laid-Open No. 64-25586. In this, a hexagonal recess into which the pipe connecting portion can be fitted is provided in the center of the flange plate, and the pipe connecting portion is fitted into the recess, and the flange plate is screwed to the open end of the pipe connecting portion. Fixed by. Further, in the one disclosed in Japanese Utility Model Laid-Open No. 1-78783, as shown in FIG. 9, a hexagonal recess (23) similar to the above is provided in the center of the flange plate (1) and the gas of the joint (33) is formed. With a configuration in which a tightening nut (29) is provided at the base end of the taper-shaped threaded portion for mounting the plug, while fitting the pipe connection part (20) of the gas plug body (2) into the recess (23). By tightening the tightening nut (29), the flange plate (1) becomes the tightening nut (29).
It is configured to be pressed against the open end of the pipe connecting part (20) and attached to the gas plug body (2).

In these conventional mounting structures,
The gas stopper body is placed in the hexagonal recess provided on the flange plate (1).
By fitting and fixing the pipe connection part (20) of (2), the bolt insertion holes (11a) (11b) of the flange plate (1) are always in a fixed positional relationship with the gas stopper body (2). Can be attached to have.

[0006] The flange plate (1) is wall-mounted by using the backing plate (31).
When it is attached to (3), the backing plate (31) is attached to the wall (so that the screw holes (32a) (32b) correspond to the bolt insertion holes (11a) (11b) of this flange plate (1). It may be attached and fixed to the peripheral portion of the opening (30) on the back side of 3).

The fixing bolts (22a) (22b) inserted into the bolt insertion holes (11a) (11b) are screwed into the screw holes (32a) (32b) of the backing plate (31) through the opening (30). When tightened until reaching the final tightening position, the flange plate (1) and the contact plate (31) pinch the peripheral edge of the opening (30),
The (1) is attached and fixed to the inside of the wall (3), and the flange body (1) attaches the gas plug body (2) to the wall (3).

In the case of this conventional example, the flange plate (1) is so arranged that the bolt insertion holes (11a) (11b) of the flange plate (1) always have a fixed positional relationship with the gas stopper body (2). ) To the gas stopper body (2), it is necessary to provide a hexagonal recess in the flange plate (1) or to provide an accessory member such as a screw member or a tightening nut as described above. In addition to increasing the number of parts, the mounting structure for attaching the flange plate (1) to the gas plug body (2) was complicated.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a bolt insertion hole provided in the flange plate is securely attached to the gas stopper body without using an additional member or the like for mounting the flange plate. An object of the present invention is to easily attach the flange plate to the gas stopper body so as to have a fixed positional relationship.

[0010]

[Means for Solving the Problems] Item 1 The technical means of the present invention for solving the above-mentioned problems is "mounting a flange plate projecting in a direction perpendicular to the axis of a pipe connection portion of a gas tap. In the structure, a male screw portion having a diameter smaller than that of the base end portion is formed on the open end side of the body portion of the pipe connecting portion, and a screw hole that is screwed into the male screw portion is formed in the center of the flange plate. Is formed, the flange plate is configured to be tightened with respect to the male screw portion until reaching a final mounting position, and a boundary portion between the proximal end side of the body portion and the male screw portion is the flange plate. In the final mounting position of, the structure is pressed against the surface of the flange plate, the contact portion deformable by the pressing is provided on the surface of the flange plate or the boundary portion, the boundary portion to the male screw portion. Shrink toward A peripheral surface of the screw hole on the front surface side of the flange plate is an annular recess recessed one step from the surface, and the contact portion is a peripheral surface side peripheral portion of the annular recess. ,
It is set so that the contact portion comes into contact with the tapered surface at the final mounting position of the flange plate ”. Here, the term “deformable” means to be plastically or elastically deformed by an external force.

The above technical means operates as follows. In the body part of the pipe connection part, the base end side is formed with a larger diameter than the open end side where the male screw part is formed, so tighten the flange plate into the male screw part of the pipe connection part. Then, the surface of the flange plate comes into contact with the base end portion of the male screw portion, that is, the boundary portion between the base end portion side of the pipe connection portion and the male screw portion, and further tightening of the flange plate is prevented. To be done. This is the state where the flange plate reaches the final mounting position with respect to the body part of the pipe connection part, and in this state, when the contact part is provided on the surface of the flange plate, the contact part is the boundary. When the contact portion is provided on the boundary portion, the contact portion is in a state of being pressed against the surface of the flange plate. Since this contact portion can be plastically or elastically deformed by the pressing, even if the flange plate has already reached the final mounting position with respect to the pipe connection portion, for example, it is provided on the flange plate. When it is desired to change the rotation angle of the flange plate, such as when changing the position of the bolt insertion hole, the flange plate may be further tightened with respect to the male screw portion. Then, the contact portion is pressed against the surface or the boundary portion of the flange plate to be plastically or elastically deformed, and the flange plate can be further rotated.

In this structure, the boundary portion is composed of a tapered surface whose diameter decreases toward the male screw portion, and the peripheral edge portion of the screw hole on the front surface side of the flange plate is recessed one step from the front surface. It is an elliptical concave portion, and the abutting portion is a surface side peripheral edge portion of the annular concave portion, and since the abutting portion is set to abut the tapered surface at the final mounting position of the flange plate, The final mounting position of the flange plate is the state where the peripheral edge on the surface side of the annular recess provided on the peripheral edge of the screw hole of the flange plate is in contact with the tapered surface formed on the body of the pipe connection part, and the flange in this state When the plate is further tightened, the peripheral edge on the surface side of the annular recess serving as the contact portion is pressed by the taper surface and is crushed and deformed, and the flange plate further rotates due to the deformation. The ability.

* 2 "A mounting structure for mounting a flange plate projecting in the direction perpendicular to the axis of the pipe connecting portion of the gas plug, wherein the base end portion is provided on the open end side of the body portion of the pipe connecting portion. A male screw portion having a smaller diameter than the side is formed, a screw hole that is screwed into the male screw portion is formed in the center of the flange plate, and the flange plate reaches the final mounting position with respect to the male screw portion. It is a configuration that is tightened, the boundary portion between the base end side of the body and the male screw portion, at the final mounting position of the flange plate, is a configuration that is pressed against the surface of the flange plate, the pressing A deformable contact part is provided on the surface or the boundary part of the flange plate, and the contact part is an independent annular part continuous with the inner peripheral edge part of the flange plate, and the final mounting of the flange plate. In position The position of the independent annular portion is set so that the protruding end of the independent annular portion comes into contact with the boundary portion and bends. ”, The flange plate is provided at the inner peripheral edge portion corresponding to the peripheral edge of the screw hole or the vicinity thereof. It is configured such that the independent annular portion is projected, and the state where the projecting end of the independent annular portion is in contact with the boundary portion of the pipe connecting portion is the final mounting position of the flange plate. When the flange plate is further tightened from this state, the protruding end of the independent annular portion is pushed as a contact portion by the boundary portion of the pipe connecting portion, and the independent annular portion is bent in the pressing direction. The flange plate can be rotated in the tightening direction by the amount of bending of the independent annular portion. In this case, the boundary portion does not necessarily have to be a tapered surface,
It suffices that the outer peripheral edge of the boundary portion is set to have a dimensional relationship in which it contacts the predetermined position of the independent annular portion (preferably closer to the protruding end).

* 3 "A mounting structure for mounting a flange plate projecting at right angles to the axis of the pipe connecting portion of the gas plug, wherein the base end portion is provided on the open end side of the body portion of the pipe connecting portion. A male screw portion having a smaller diameter than the side is formed, a screw hole that is screwed into the male screw portion is formed in the center of the flange plate, and the flange plate reaches the final mounting position with respect to the male screw portion. It is a configuration that is tightened, the boundary portion between the base end side of the body and the male screw portion, at the final mounting position of the flange plate, is a configuration that is pressed against the surface of the flange plate, the pressing A deformable contact portion is provided on the surface of the flange plate or on the boundary portion, and the contact portion is provided at a position on the flange plate side of the boundary portion, and an inner peripheral edge is integrally connected to the base end portion side. On the outer peripheral side The annular plate is a protruding annular plate, and the position of the annular plate is set so that the outer peripheral portion of the annular plate comes into contact with the surface of the flange plate and bends at the final mounting position of the flange plate. The portion is provided at the boundary portion, and the state where the outer peripheral portion of the annular plate that functions as the contact portion contacts the surface of the flange plate is the final mounting position of the flange plate. If the flange plate is further tightened from this state, the annular plate is pushed by the flange plate and bends toward the base end side of the pipe connection portion, and the amount of this bending causes rotation of the flange plate in the tightening direction. It will be possible.

[0015]

The present invention, having the above-mentioned structure, has the following unique effects. The flange plate can be attached to the main body of the gas stopper by simply tightening the flange plate to the body of the pipe connection part of the gas stopper until it reaches the final mounting position.
Since it is easy to attach the flange plate to the gas stopper body, and it is not necessary to provide an accessory such as a screw member for attachment, the number of components can be reduced accordingly. or,
When the flange plate in the tightened state is further rotated in the tightening direction until reaching the final mounting position, the flange plate or the contact portion provided at the boundary portion in the body portion of the pipe connection portion is deformed, and the flange plate is further It is possible to rotate. Therefore, when you want to adjust the position of the bolt insertion hole formed in the flange plate, without loosening the tightening of the flange plate, the male screw portion of the pipe connection portion,
The position can be adjusted by further rotating in the tightening direction.

In addition to the above-mentioned effects, in the second item, when the peripheral edge on the front surface side of the annular recess provided on the flange plate as the contact portion comes into contact with a predetermined position of the tapered boundary portion. Then, since the tightening torque of the flange plate becomes heavy, there is an effect that it can be surely confirmed that the flange plate has been mounted at the final mounting position with respect to the pipe connection portion of the gas plug body.

In the third aspect, since the annular independent annular portion which is projected from the peripheral edge portion on the surface side of the annular concave portion of the flange plate as the contact portion is pressed by the boundary portion to be easily bent, the flange plate is used. When it is desired to rotate in the tightening direction further than the final mounting position, it is easy to rotate, and even a large deviation of the flange plate can be corrected.

In the item (4), since the annular plate as a contact part projecting from the boundary part is easily bent by being pressed by the flange plate, the same effect as the above item (3) can be obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present invention described above will be described in detail with reference to the drawings. FIG. 1 shows a gas plug body (2) with a flange plate (1) according to the first embodiment.
FIG. 3 is a partially cutaway cross-sectional view showing a state in which is attached to the wall (3) by using a backing plate (31).

On the open end side of the pipe connection part (20) of the gas plug body (2), a male screw part (21) having a diameter smaller than that of the base end side body part (24).
Is formed, and the boundary portion (portion A in FIG. 1) between the male screw portion (21) and the proximal end side body portion (24) is tapered as shown in the enlarged sectional view of FIG. 25).

As shown in FIG. 3, the flange plate (1) is a metal disc having a screw hole (10) formed in the center thereof to be screwed into the male screw portion (21). The bolt insertion holes (11a) and (11b) are formed at symmetrical positions with respect to (). In addition, the surface of the flange plate (1) is attached to the periphery of the screw hole (10).
It has a configuration in which an annular recessed portion (12) which is recessed one step from (1a) is formed.

When the screw hole (10) of the flange plate (1) is screwed into the male screw part (21) of the gas stopper body (2) and tightened, the flange plate (1) is attached to the gas stopper body (2). As it moves toward the body part (24) on the base end side, the peripheral edge part (13) on the front surface side of the annular recess (12) comes into contact with a predetermined position of the tapered surface (25) as shown in FIG. Tightening torque becomes heavy at the time of
The tightening of (1) will be prevented. In this state, the flange plate (1) is completely attached to the gas stopper body (2) until it reaches the final installation position, and the front side peripheral edge part (13) is the contact part. It will function as (H).

In the case of a gas plug of the type shown in FIG. 1, the bolt insertion holes (11a) and (11b) are easy to tighten a fixing bolt (not shown) to be inserted therethrough and have a good appearance. In consideration of the above, as shown by the solid line in FIG.
It is desirable to place them horizontally to the left and right of (2).

However, in the state where the flange plate (1) is tightened until it reaches the final mounting position, the bolt insertion holes (11a) (11b) are not always located just horizontally, and the two points in the figure are shown. As shown by the chain line, it may be located at a slanted position. In such a case, forcibly tighten the flange plate (1) to rotate the flange plate (1),
Adjust the positions of the bolt insertion holes (11a) (11b).

At the final mounting position of the flange plate (1), as shown by the solid line in FIG. 2, the taper surface (25) of the gas stopper body (2) is attached to the peripheral portion (13) on the front surface side of the flange plate (1). Are in contact with each other, but when the flange plate (1) is forcibly tightened further, as shown by the chain double-dashed line in the figure, the surface side peripheral edge portion (13) is tapered surface (25). It is forcibly plastically deformed in such a manner that the edge portion is crushed by being pressed by. The flange plate (1) at the final mounting position can be further tightened and rotated by the amount of this deformation.

It should be noted that, by tightening the flange plate (1), it is possible to move the flange plate (1) to the proximal end side body part (24) side of the gas plug body (2) so that the male screw part ( It is necessary to provide a certain amount of space between the proximal end of 21) and the tapered surface (25).

In this way, the flange plate (1) is attached to the gas stopper body (2).
By simply screwing it into the male screw part (21) and tightening it, the bolt insertion holes (11a) (11b) can be fitted to the gas plug with the flange plate (1) located on the left and right with respect to the gas plug body (2). Complete.

After that, the flange plate (1) may be attached to the wall (3) using the contact plate (31) in the same manner as in the conventional case. As the abutting plate (31), a substantially inverted U-shaped metal plate as shown in FIG. 4 can be adopted.
Is accommodated in the wall (3) through the opening (30) formed in the wall (3), and the screw holes (32a) (32b) provided therein
However, it is attached and fixed to the vicinity of the periphery of the opening (30) on the back side of the wall (3) with an adhesive tape or the like so as to be positioned in the horizontal direction.

After that, the end portion of the flexible pipe (4) is pulled out to the room side from the opening (30) of the wall (3), and the pipe connecting portion (20) of the gas stopper body (2) is connected through the joint (33). And the flexible pipe (4) back into the wall (3), and the bolt insertion holes (11a) (11
The flange plate (1) is attached to the wall (3) from the indoor side so that b) is positioned horizontally.

When the fixing bolts are inserted into the bolt insertion holes (11a) (11b), the fixing bolts are opened in the wall (3).
Through the (30), screw holes (32a) in the backing plate (31) on the back side of the wall (3)
(32b) can be screwed, and by tightening this,
As shown in FIG. 1, the gas stopper main body (2) has a structure in which the wall (3) is sandwiched between the flange plate (1) and the contact plate (31).
It will be attached to the wall (3) along with (1).

FIG. 6 shows the gas stopper body (2) of the second embodiment and the flange plate (final mounting position) with respect to the male screw portion (21) of the gas stopper body (2). FIG. 2 is an enlarged cross-sectional view of the main part of 1). In this embodiment, the base end side body
The boundary portion between the (24) and the male screw portion (21) having a smaller diameter than this is a tapered surface as in the first embodiment.
(25) and the flange plate
On the front surface side of (1), an annular recess (12) is formed along the peripheral edge of the screw hole (10) as in the first embodiment, and the peripheral edge of the front surface side is further formed. The independent annular portion (14) projects from the portion toward the center of the peripheral portion on the front surface side. The independent annular portion is integrally connected to the flange plate only at the outer peripheral edge portion.

Insert the screw hole (10) of the flange plate (1) into the gas stopper body.
When it is screwed into the male screw part (21) of (2) and tightened, the flange plate (1) moves toward the proximal end side body part (24), and the independent annular part (14). Inner peripheral edge (15) is the gas stopper body
At the stage of contact with the tapered surface (25) of (2), the tightening torque of the flange plate (1) becomes heavy, and further tightening of the flange plate (1) is prevented. That is, in this embodiment, the inner peripheral edge (15) of the independent annular portion (14) is the contact portion (H).
Will function as.

This state shown by the solid line in FIG. 6 is a state in which the flange plate (1) is fastened to the gas plug body (2) until it reaches the final mounting position. Flange plate in this state
To adjust the rotation angle of (1), rotate the flange plate (1) further in the tightening direction. Then, the tightening force causes the inner peripheral edge (15) of the independent annular portion (14) to be tapered (25).
Is pushed inward by the annular recess (12) by the flange plate (1)
Is an independent annular portion (14), as shown by the two-dot chain line in the figure,
It will be tightened while being deformed along the tapered surface (25) so as to bend inward of the annular recess (12). The flange plate (1) can be rotated by a predetermined angle by the degree of bending of the independent annular portion (14).

In this embodiment, the gas stopper body (2)
The boundary portion between the proximal end side body portion (24) and the male screw portion (21) is formed by the tapered surface (25), but it deforms so as to bend the independent annular portion (14). If possible, for example, as shown in FIG. 7, the boundary portion is a step portion (26), and a mutual dimensional relationship is set so that a predetermined position of the independent annular portion (14) abuts on the step portion (26). You may set it. In this case, the independent annular portion (1
The predetermined position on the surface side of 4) will function as the contact part (H).

Further, the independent annular portion (14) does not have to be provided in a loop shape, and it is sufficient that the independent annular portion (14) is formed as an independent annular portion only by a partial projecting portion or by continuation thereof. Further, the projecting direction is not particularly limited as long as it can abut the boundary portion of the pipe connecting portion (20).

FIG. 8 shows a gas stopper body (2) of the third embodiment and a flange plate (final mounting position for the male screw portion (21) of the gas stopper body (2)). FIG. 2 is an enlarged cross-sectional view of the main part of 1). In this embodiment, the base end side body
In the space between the stepped portion (28) and the small-diameter male screw portion (21) that form the boundary between the (24) and the male screw portion (21) with a smaller diameter, the tip is It is assumed that an annular plate (27) having a substantially L-shaped cross section, which extends toward the open end of the stopper body (2), is configured to project.

In this embodiment, the flange plate
As you tighten (1), the surface of the flange plate (1) will
The movement of the flange plate (1) in the tightening direction is prevented when it comes into contact with the tip of the (7). That is, the tip portion of the annular plate (27) becomes the contact portion (H). From the final mounting position of the flange plate (1) where the contact part (H) abuts the surface of the flange plate (1), when the flange plate (1) is further tightened, the annular plate (27) is As shown by the dotted line, the contact portion (H) is pushed by the surface of the flange plate (1), so that the contact portion (H) bends toward the proximal end side body portion (24) side. Thus, the flange plate (1) can be tightened while bending the annular plate (27) toward the base end side body part (24) side, and can be rotated in a predetermined angle tightening direction.

Incidentally, what is disclosed in each of the above embodiments is
An example of the shape of the peripheral portion of the screw hole (10) of the flange plate (1) and the shape of the boundary between the proximal end side body portion (24) of the gas stopper body (2) and the male screw portion (21) When tightening the flange plate (1), at the final mounting position of the flange plate (1),
The flange plate (1) or the gas stopper body (2) is contacted to prevent further tightening of the flange plate (1), but when the flange plate (1) is forcibly tightened, it is deformed. However, if the contact part (H) is formed to allow further tightening of the flange plate (1), the shape of the flange plate (1) and the gas stopper body (2) and their combination are free. It goes without saying that it can be set. Further, the positional relationship of the bolt insertion holes (11a) (11b) of the flange plate (1) with respect to the gas stopper body (2) may be appropriately set according to the shape, posture, etc. of the gas stopper body (2). .

[Brief description of drawings]

FIG. 1 is a gas plug body according to a first embodiment of the present invention.
FIG. 3 is a partial cross-sectional view showing an example in which the flange plate (1) attached to (2) is attached and fixed to the wall (3).

FIG. 2 is an enlarged cross-sectional view of the portion of FIG.

FIG. 3 is a flange plate according to the first embodiment of the present invention.
Sectional view of (1).

FIG. 4 is an explanatory view of a backing plate (31)

FIG. 5 is a front view of the gas plug with the flange plate according to the embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a flange plate (1) and a gas plug body (2) according to a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of an essential part showing a modified example of the gas plug body (2) according to the second embodiment of the present invention.

FIG. 8 is an enlarged sectional view of an essential part of a flange plate (1) and a gas plug body (2) according to a third embodiment of the present invention.

[Fig. 9] A conventional gas stopper body (2) with a flange plate (1) is attached to a wall
Partial sectional view showing the state of being attached to (3).

[Explanation of symbols]

(1) ・ ・ ・ ・ Flange plate (10) ・ ・ ・ Screw hole (20) ・ ・ ・ Piping connection (21) ... Male thread (24) ・ ・ ・ Body end side (25) (26) ・ ・ ・ Boundary (H) ... hit part

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 5/00 F16K 27/00 F16L 23/024 F16L 23/026 F16L 23/028

Claims (3)

(57) [Claims] 1. A mounting structure for mounting a flange plate projecting in a direction perpendicular to an axis of a pipe connecting portion of a gas plug, wherein the pipe connecting portion is provided on an open end side of a body portion from a base end side. Is also formed with a male screw portion having a small diameter, a screw hole that is screwed into the male screw portion is formed in the center of the flange plate, and the flange plate is tightened with respect to the male screw portion until the final mounting position is reached. The boundary portion between the base end portion side of the body portion and the male screw portion is configured to be pressed against the surface of the flange plate at the final mounting position of the flange plate, and is deformed by the pressing. A possible contact portion is provided on the surface or the boundary portion of the flange plate, and the boundary portion is composed of a tapered surface that reduces in diameter toward the male screw portion, and the screw hole on the surface side of the flange plate is formed. The edge portion is an annular recess recessed one step from the surface, the contact portion is a peripheral edge on the surface side of the annular recess, and the contact portion contacts the tapered surface at the final mounting position of the flange plate. Flange plate mounting structure for gas plugs that are set to contact. 2. A mounting structure for mounting a flange plate projecting in a direction perpendicular to an axis of the pipe connecting portion of the gas plug, wherein the pipe connecting portion is provided on the open end side of the body portion from the base end side. Is also formed with a male screw portion having a small diameter, a screw hole that is screwed into the male screw portion is formed in the center of the flange plate, and the flange plate is tightened with respect to the male screw portion until the final mounting position is reached. The boundary portion between the base end portion side of the body portion and the male screw portion is configured to be pressed against the surface of the flange plate at the final mounting position of the flange plate, and is deformed by the pressing. A possible contact part is provided on the surface or the boundary part of the flange plate, and the contact part is an independent annular part continuous with the inner peripheral edge part of the flange plate, and at the final mounting position of the flange plate. Previous Flange plate mounting structure to separate the annulus gas stopper protruding end the independent annulus position to deflect in contact with the boundary portion is set for. 3. A mounting structure for mounting a flange plate projecting in a direction perpendicular to an axis of the pipe connecting portion of the gas plug, wherein the pipe connecting portion is provided on the open end side of the body portion from the base end side. Is also formed with a male screw portion having a small diameter, a screw hole that is screwed into the male screw portion is formed in the center of the flange plate, and the flange plate is tightened with respect to the male screw portion until the final mounting position is reached. The boundary portion between the base end portion side of the body portion and the male screw portion is configured to be pressed against the surface of the flange plate at the final mounting position of the flange plate, and is deformed by the pressing. A possible contact portion is provided on the surface of the flange plate or the boundary portion, and the contact portion is provided at a position on the flange plate side of the boundary portion, and an inner peripheral edge is integrally connected to the base end portion side. Overhang on the outer peripheral side It is an annular plate, and at the final mounting position of the flange plate, the position of the annular plate is set so that the outer peripheral portion of the annular plate contacts the surface of the flange plate and bends. Construction.