JP2002054616A - Fastener, and method of locking the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener provided with a rational structure to be easily locked to an installation part, and a rational locking method for easily locking the fastener to the installation part. SOLUTION: This fastener 4 is provided with a rotation torque input part 5, an extended part 6 extended from the input part 5, an engagement part 7 provided in a part of the extended part 6 to be engaged with the installation part, and a restraining means 8 to restrain the extended part 6 in a specified deformed state. By rotation torque inputted to the input part 5 as the fastener 4 is disposed at a specified position of the installation part, the extended part 6 is deformed. By deformation force generated by above deformation to change an interval between the input part 5 and the engagement part 7, the fastener 4 is engaged with the installation part. By restraining such an engaged state by the restraining means 8, the fastener 4 is locked to the installation part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a fastener fixed to a mounting portion and a method of fixing the fastener.

[0002]

2. Description of the Related Art Conventionally, in order to fix a fastener to a mounting portion, generally, the fastener and the mounting portion are fixed using screws. However, the fixing method using screws requires parts for fixing, tools for fixing the parts, and the like, and the fixing is complicated.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a fastener having a rational structure for easily fastening to a mounting portion, or a rational fastener for easily fastening a fastener to an mounting portion is provided. It is an object to provide a wearing method.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is a fastener or a fastening method of a fastener having a structure as described in each of the claims. According to the first aspect of the present invention, the fastener is provided on a portion for inputting the rotational torque, an extending portion extending from the input portion, and a part of the extending portion, and is engageable with the mounting portion. And a restraining means for restraining the extended portion in a predetermined deformed state. Further, the extension portion is deformed by the rotation torque input to the input portion in a state where the fastener is disposed at a predetermined position of the attachment portion. The fastener is engaged with the mounting portion by the deformation force generated by this deformation, which changes the distance between the input portion and the engagement portion. Further, the engaging state is restrained by the restraining means, so that the fastener is fixed to the mounting portion.

Here, the shape of the extending portion extending from the input portion is, for example, a shape that refracts linearly or in the middle, or extends in a curved line. Further, the extension portion may be configured not only by one component but also by a plurality of components. In addition, the extension part is not limited to the case where the entire extension part is deformed, but part of the extension part is deformed, and when the extension part is configured by a plurality of parts, one of the parts is deformed or the joint part is deformed. May be performed. In addition, it is preferable that the extending portion has a shape extending on a plane perpendicular to the rotation axis of the rotating torque so that the extending portion can be efficiently deformed by the rotating torque. The engagement portion is provided in a part of the extension portion, that is, at a predetermined location on the extension portion. In particular, it is preferable that the engaging portion is provided near the distal end of the extending portion so that a deformation force is easily generated between the input portion and the engaging portion. A rotation torque (torsional moment) about the input unit as a rotation center is input to the input unit. Therefore, the fastener can be easily attached to the attachment portion only by using the components without using screws or the like. Further, since the fastener is deformed and the fastener is engaged with the mounting portion by using the deformation force, the fastener can be firmly engaged. Note that the fastener may be a fastener for fastening the fastener itself to the attachment portion, or may be a fastener used for attaching another thing to the attachment portion.

According to the invention described in claim 2, according to claim 1
Wherein the input unit includes a stopper portion and a contact portion. The retaining portion can be inserted into a mounting hole provided in the mounting portion and can be engaged with the upper surface of the mounting portion by being rotated by a rotating torque input to the input portion. The contact portion contacts the lower surface of the mounting portion when the input portion is inserted into the mounting hole. That is, in a state where the fastener is disposed at a predetermined position of the mounting portion, the input portion is rotated by the rotating torque input to the input portion, and the mounting portion is prevented from slipping out of the upper surface and the lower surface is sandwiched by the contact portion. It is. Therefore, the fastener is fixed to the mounting portion, and in particular, the vertical movement of the fastener with respect to the mounting portion is restricted. Therefore, in addition to the structure according to the first aspect of the present invention, in addition to the structure in which the retaining portion of the input portion and the abutting portion engage with the attaching portion, the fastener is more securely fastened to the attaching portion. Can be.

According to the third aspect of the present invention, the first aspect is provided.
Or the fastener according to 2, wherein the restraining means of the fastener includes a first locking portion provided on the distal end side of the extension portion and a second locking portion provided on the input portion side of the extension portion. It consists of a part. In addition, the first locking portion and the second locking portion are configured to engage with each other when the extension portion is deformed by the rotation torque input to the input portion. Therefore, the first locking portion and the second locking portion are engaged by a series of deformation operations of the extension portion, and the deformation state of the extension portion can be restricted. Therefore, there is no need to provide a special process for engaging the first locking portion and the second locking portion, and the fastener can be easily fixed to the mounting portion.

[0008] According to the invention described in claim 4, according to claim 1 of the present invention.
4. The fastener according to any one of items 3 to 3, wherein the input portion is formed in a substantially triangular shape that can be inserted into a substantially triangular mounting hole provided in the mounting portion. Therefore, the input portion of the fastener comes into contact with the two sides of the mounting hole due to the deformation force that tends to change the distance between the input portion and the engaging portion. Therefore, the fastener is stably fixed to the mounting portion. In the case where the input section is rotated as in the second aspect of the present invention, since the input section and the mounting hole are both substantially triangular, the input section and the mounting hole are likely to overlap each other. A retaining portion engageable with the upper surface of the portion can be easily provided on the fastener.

According to a fifth aspect of the present invention, there is provided a fastening method for fastening a fastener to an attachment portion, wherein an input portion and an engagement portion of the fastener are respectively disposed at predetermined positions of the attachment portion. I do. For example, the input part and the engaging part are inserted into two holes provided in the mounting part, respectively, and the fastener is arranged in the mounting part. Next, a rotation torque is input to the input portion, and the extension portion extending from the input portion and connecting the engagement portion is deformed, and the deformation between the input portion and the engagement portion changes due to the deformation. The engaging portion is engaged with the mounting portion by the deformation force to be applied. And the deformation of the extension part is restrained by the restraining means of the fastener,
Fasten the fastener to the mounting part. Thus, in order to fix the fastener to the mounting part by deforming the extension part of the fastener,
The fastener can be easily fixed to the mounting portion without the need for a fixing member such as a screw. The restriction of the deformation of the extension by the restricting means may be performed by a series of movements with the deformation of the extension by the rotation torque input to the input unit, or by adding another operation. May be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the perspective view of FIG. 1, a fastener 4 is a component of the sun visor 1 and is fastened to a mounting portion 3 to mount the sun visor 1 to the mounting portion 3. The sun visor 1 further includes a plate-shaped sun visor body 10 forming a light shielding portion, and a support shaft 2 that rotatably holds the sun visor body 10. 2 is a perspective view of the fastener 4, FIG. 3 is a top view from the direction of arrow III in FIG. 2, and FIG. 4 is a bottom view from the direction of arrow IV in FIG. FIG.
As shown in FIG. 4, the fastener 4 includes an input portion 5 into which the support shaft 2 is rotatably inserted, an extension portion 6 extending from the input portion 5,
It is composed of an engaging portion 7 provided on a part of the extending portion 6 and a restraining means 8 provided on the extending portion 6.

The input section 5 has a substantially cylindrical bearing holding section 50, and the inner diameter of the bearing holding section 50 becomes narrower as it is closer to the insertion side (upper side in FIG. 2) into the mounting section 3. A plurality of notched grooves 51 provided in the longitudinal direction of the bearing holding portion 50 are formed at the upper end in FIG. As shown in FIGS. 2 and 4, a shaft detachment preventing portion 58 protruding toward the inner peripheral side is formed on the inner peripheral portion of the upper end portion of FIG. 2 of the bearing holding portion 50.

Further, on the outer peripheral surface side of the bearing holding portion 50, two substantially triangular prism-shaped retaining portions 52, 52 and a column having a substantially arrow-shaped cross section in which a rectangular section and a triangular section are provided continuously. Shaped retaining portions 53 are provided at equal intervals. Also,
These retaining portions 52, 52, 53 are provided with bearing holding portions 50.
Thus, the outer shape forms a substantially triangular shape. Further, the bearing holding portion 50 below the retaining portions 52, 52, 53 is provided.
A first contact portion 54 is formed on the outer peripheral surface of the bearing holder 50 along a substantially half circumference of the outer peripheral surface of the bearing retaining portion 50. A second abutting portion 55 is formed on the outer peripheral surface side of the cylinder 50 so that the longitudinal direction of the column is substantially half-split. As shown in FIG. 4, a fan-shaped surface provided along the outer peripheral shape of the first contact portion 54 is provided on the surface of the first contact portion 54 on the insertion side (lower side in FIG. 2) of the support shaft 2. A rail groove 56 is formed.

The extending portion 6 has an input portion connecting arm 60 extending straight from the input portion 5 and a shape extending continuously from the input portion connecting arm 60 and winding the outer periphery of the input portion 5, ie, a curved shape, a spiral shape, and a circle. The extension arm 61 extends in an arc shape. Further, a first locking portion 70 is formed at an end of the extension arm 61 on the distal end side along the extension shape of the extension arm 61. Also, the extension arm 61 and the input section connection arm 6
0, that is, on the input portion 5 side of the extension portion 6, the extension portion 61 is extended to the side opposite to the extension side of the extension arm 61, and a second locking portion 73 is formed. Have been. The first locking part 70 and the second locking part 73 constitute the restraining means 8. Further, as shown in FIG. 4, on the lower surface side of FIG. 2 of the extension arm 61 and the second locking portion 73, a support shaft holding bank portion 62 is formed along the outer periphery.

The first locking portion 70 is composed of an arm 71 formed continuously with the extending arm 61 and a projection 72 projecting outward provided at the tip of the arm 71. The second locking portion 73 is composed of an arm 74 formed continuously with the extension arm 61 and a projection 75 provided at the end of the arm 74 and extending inward.
A substantially triangular prism engaging portion 7 is formed at one end of the extension arm 61 facing the input portion 5 so as to be perpendicular to the plane on which the extension arm 61 extends.

As shown in a perspective view of FIG. 5, the support shaft 2 includes a main body support receiving rod 20 for supporting the sun visor main body 10, a fastener fitting rod 23 rotatably fitted to the fastener 4, and It is constituted by a substantially conical rotation guide portion 21 that connects the main body support receiving rod 20 and the fastener fitting insertion rod 23. The fastener fitting rod 23 has a stopper flange 24 at the tip and a shaft stopper preventing receiving portion 25 having a smaller diameter at a position adjacent to the stopper flange 24. Further, on the outer periphery of the fastener fitting rod 23, a suppressed part 26 which is a column having a substantially right-angled triangular cross section is formed at a position in contact with the plane of the rotation guide part 21.

As shown in FIG. 1, the mounting portion 3 includes a body 30 forming a ceiling panel of the vehicle, and a head lining 31 provided on a lower surface of the body 30.
The body 30 is formed with a substantially triangular mounting hole 32 and a substantially triangular locking hole 33 which is a hole smaller than the mounting hole 32. The head lining 31 is provided with a lining mounting hole 34.
And a substantially triangular lining locking hole 35 having substantially the same shape as the locking hole 33 is formed. The shape of the lining mounting hole 34 is a shape in which a circle is overlapped with the shape of the mounting hole 32 of the body 30.

Next, a state in which the support shaft 2 is fitted into the fastener 4 will be described with reference to FIG. Fixing rod 2 for supporting shaft 2
3 is inserted into the bearing holder 50 of the fastener 4. When the support shaft 2 is inserted, the diameter of the bearing holding portion 50 is widened by the notch groove 51, so that the support shaft 2 can be easily inserted, and the retaining flange 2
4 is carried out until it protrudes from the bearing holder 50. At this time, since the lower surface of the retaining flange 24 is in contact with the end face of the bearing holder 50, the retaining flange 24 does not come off from the bearing holder 50. Further, the shaft retaining portion 58 of the bearing holding portion 50
Engages with the shaft removal prevention receiving portion 25 of the support shaft 2. The inhibited portion 26 of the support shaft 2 is inserted into the rail groove 56 of the fastener 4.

Next, a method of mounting the fastener 4 and the support shaft 2 to the mounting portion 3 will be described. The input part 5 of the fastener 4 is inserted into the mounting hole 32 and the lining mounting hole 34 of the mounting part 3, and the engaging part 7 of the fastener 4 is inserted into the locking hole 33 and the lining locking hole 35.
Insert (place). The shape of the mounting hole 32 and the shape of the substantially triangular component of the lining mounting hole 34 are as follows.
The shape is substantially the same as the substantially triangular shape formed by the retaining portions 51, 51, 52 of the input portion 5. The shapes of the locking holes 33 and the lining locking holes 35 are substantially the same as the substantially triangular cross-sectional shape of the engaging portion 7.

Further, the arrangement of these holes corresponds to the free state in which no external force is applied to the fastener 4, that is, the shape and position of the input section 5 and the engaging section 7 in the state shown in FIG. I have. Further, the first contact portion 54 and the second contact portion 55 of the input portion 5 abut on the lower surface of the attachment portion 3 without penetrating the attachment hole 32 and the lining attachment hole 35, and the insertion of the fastener 4 is suppressed. Is done. FIG. 6 is a top view of the mounting portion 3 when the fastener 4 and the support shaft 2 are arranged on the mounting portion 3 as described above, and FIG. 7 is a bottom view of the mounting portion 3 as viewed from the lower surface side. It is.

Next, a method of attaching the fastener 4 to the attachment portion 3 will be described. The support shaft 2 is rotated in the direction of arrow A shown in FIG. By being rotated, the suppressed portion 26 of the support shaft 2 is
Moves in the rail groove 56, and the rotation is restricted by the rotation suppressing portion 56 a which is the end face of the rail groove 56.

When the support shaft 2 is further rotated, a rotation torque is input from the support shaft 2 to the input section 5 of the fastener 4. Due to this turning torque, the extension arm 61 of the extension section 6 is deformed so as to wind around the input section 5, and the radius of curvature of the extension arm 61 is reduced. Here, the turning torque refers to a torsional moment about an axis in the longitudinal direction of the input section 5 or an axis perpendicular to the extension plane of the extension section 6. With the series of deformations of the extension arm 61 caused by the rotation torque, the arm 71 of the first locking portion 70 is deformed inward, and the arm 74 of the second locking portion 73 is deformed outward, and the protrusion 72, 7
5 are engaged (see FIGS. 3, 4, and 9).

When the projections 72 and 75 are engaged,
The extension 6 is restrained in a deformed state. FIG.
10 is a top view of the mounting portion 3 viewed from the upper surface side in a state where the extension portion 6 is deformed and restrained, FIG. 9 is a bottom view of the mounting portion 3 viewed from the lower surface side, and FIG. FIG. 3 is a sectional view taken along line XX of FIG. The extension portion 6 is deformed in a direction in which the curvature becomes smaller, whereas the movement of the input portion 5 and the engagement portion 7 is restricted by the attachment holes 32 and the engagement holes 33 of the attachment portion 3.
Therefore, the input section 5 and the engagement section 7 tend to change in the direction of arrow B in FIG. 8, that is, in the direction in which the distance between the input section 5 and the engagement section 7 becomes shorter. Therefore, the input portion 5 and the engaging portion 7 are engaged with the mounting portion 3 by the changing force.

Further, since the engaging portion 7 and the locking hole 33 are substantially triangular, respectively, the engaging portion 7 and the input portion 5 have a large number of contact surfaces, and the two surfaces are easily in contact with each other. Therefore, the engaging portion 7 and the locking hole 33 are stably engaged.

The input unit 5 rotates with respect to the mounting hole 32 by the rotation torque input by the support shaft 2, and
From the state shown in FIG. 8 in the direction of arrow C shown in FIG. Therefore, the retaining portions 52, 52, 53 rotate with respect to the mounting hole 32, and the upper surface of the mounting portion 3 and the lower surfaces of the retaining portions 52, 52, 53 contact (engage) as shown in FIG. I do. Further, the first contact portion 54 contacts the lower surface of the mounting portion 3, and similarly, the second contact portion 55 also contacts the lower surface of the mounting portion 3. Therefore, the mounting portion 3 is provided on the upper surface thereof by the retaining portions 52, 52, 53.
The lower surface is sandwiched between the first contact portion 54 and the second contact portion 55.

The support shaft 2 in this state is
Is moved in the rail groove 56 of the fastener 4 so as to be able to rotate with respect to the fastener 4 within a predetermined rotation range.

The fastener 4 may have a structure in which the input portion 5, the extension portion 6, the engagement portion 7, and the restraining means 8 are formed separately, but they are preferably formed integrally. Further, the extension 6 is an elastically deformable material, and is preferably formed of an elastic resin material. The more elastically deformable the material, the greater the deformation force, so that the input part 5 and the engagement part 7 of the fastener 4 can be further locked to the mounting part 3. Further, the attachment hole 32 and the locking hole 33 are substantially triangular, but may be circular, or preferably non-circular and have a polygonal or elliptical shape. Thereby, the input unit 5 and the engagement unit 7 can be stably locked to the attachment unit 3.

The attachment between the fastener 4 and the attachment part 3 utilizes a deformation force that tends to change the distance between the input part 5 and the engagement part 7 caused by the deformation of the extension 6 of the fastener 4. That is,
This deformation force is suppressed by the mounting hole 32 and the locking hole 33, the input portion 5 is locked in the mounting hole 32, and the engaging portion 7 is locked in the locking hole 33. Therefore, the fastener 4 is mounted on the mounting portion 3, and is particularly stably mounted against the movement of the mounting portion 3 in the planar direction.

The input unit 5 is rotated by the input rotation torque, and the retaining portions 52, 52, 53 of the input unit 5 abut (engage) with the upper surface of the mounting unit 3, and the input unit 5 is rotated. The first contact portion 54 and the second contact portion 55 contact (engage) with the lower surface of the mounting portion 3. Therefore, the fastener 4 is mounted on the mounting portion 3, and is particularly stably mounted against the vertical movement of the mounting portion 3.

Further, since the rotation torque input by the input unit 5 can be input by the support shaft 2, the support shaft 2 having a long handle or the sun visor body 10 is rotated to utilize the principle of leverage. To apply a rotating torque, and can be easily assembled. Also, since the fastener 4 can be attached to the mounting portion 3 only by deforming the fastener 4,
No fixing screws are required, and no tools or the like for tightening the screws are required.

In the above-described embodiment, the engaging portion 7 provided on the fastener 4 is a substantially triangular prism and is provided in a convex shape from the extending portion 6. It is also possible to adopt another embodiment in which the engaging portion 7 is provided in the second embodiment. In this case, the mounting portion 3 is provided with a convex or columnar locking portion capable of engaging with the concave or concave engaging portion 7 instead of the locking hole 33. Even in such a mode, it is possible to obtain the same effects as those of the above embodiment.

In the above embodiment, the extending portion 6 extends so as to wind around the input portion 5.
Another embodiment as shown in FIG. 11, which is a top view of the fastener 4 (a view corresponding to FIG. 3), may be used. As shown in FIG. 11, the fastener 4 is provided with the input unit 5 in the same manner as in the above embodiment.
, An extending portion 6 extending from the input portion 5, an engaging portion 7 provided on a part of the extending portion 6, and a restraining means 8 provided on the extending portion 6.
, But has a shape in which the extending portion 6 does not wind the input portion 5 and the engaging portion 7, that is, a shape in which the input portion 5 and the engaging portion 7 are connected in a V-shape or an arc shape. In this case, it is preferable that the extending portion 6 is provided with an extending thin arm portion 63 so that the extending portion 6 is easily deformed. In addition, restraining means 8
Is an arm 8 provided on the input section 5 side of the extended thin arm section 63.
0 and a convex hook portion 81 provided at the tip of the arm 80
And a first locking portion 83 formed in a concave shape on the distal end side of the extended thin arm portion 63.

When a rotating torque is input to the input unit 5 in a state where the fastener 4 is installed on the attachment unit 3, the extension unit 6 is deformed, and the distance between the input unit 5 and the engagement unit 7 is increased. A deforming force is generated. Since this deformation force is restricted by the mounting holes 32 and the locking holes 33 provided in the mounting portion 3, the input portion 5 and the engaging portion 7 are locked to the mounting portion 3, and the fastener 4 is fixed to the mounting portion 3. 3 is attached. Therefore, the fastener 4 can be easily attached to the mounting portion 3 by the fastener 4. Further, in this embodiment, the extension portion 6 can be configured to be short, and the size can be reduced.

Further, as another embodiment, FIG.
Is a case where the extension thin arm portion 63 is formed of another part from the other portion of the extension portion 6. In this case, for example, the extension thin arm 63 is a hinge and its joint portion is rotatable, or the extension thin arm 63 is formed of a highly elastic spring. That is, the extension portion 6 is configured by a plurality of components, and the connection portion or one component thereof is deformed. Also in this embodiment, the fastener 4 can be installed on the mounting portion 3.

In the above embodiment, the convex engaging portion 7 is fitted into the locking hole 33 of the mounting portion 3 so that the mounting portion 3 and the engaging portion 7 are engaged. On the other hand, the engaging portion 7 is formed in a concave shape, and the convex engaging portion engaging in the concave shape is attached to the mounting portion 3.
May be provided. Also in this embodiment, the mounting portion 3 and the engaging portion 7 can be engaged.

In the above embodiment, the restrained portion 26 is formed on the support shaft 2, and the rail groove 56 and the rotation restraining portion 56 a are formed on the fastener 4. 5
6 and the rotation restraining portion 56a may be formed, and the restrained portion 26 may be formed on the fastener 4. Even in this embodiment, the same effects as in the above embodiment can be obtained.

[0036]

According to the present invention, there is provided a fastener which can be easily fixed to a mounting portion, and a method for fixing the fastener.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sun visor.

FIG. 2 is a perspective view of a fastener.

FIG. 3 is a top view from the direction of arrow III in FIG. 2;

FIG. 4 is a bottom view from the direction of arrow IV in FIG. 2;

FIG. 5 is a perspective view of a support shaft.

FIG. 6 is a top view of the mounting portion in a state where the fastener and the support shaft are arranged on the mounting portion, as viewed from the upper surface side.

FIG. 7 is a bottom view of the attachment portion in a state where the fastener and the support shaft are arranged on the attachment portion, as viewed from the lower surface side.

FIG. 8 is a top view as seen from the upper surface side of the attachment portion in a state where the extension portion is deformed and restrained.

FIG. 9 is a bottom view of the mounting portion viewed from the lower surface side in a state where the extension portion is deformed and restrained.

FIG. 10 is a sectional view taken along line XX of FIG. 8;

FIG. 11 is a top view of a fastener according to another embodiment.

[Description of Signs] 1 ... Sun visor 2 ... Support shaft 3 ... Mounting part 4 ... Fastening tool 5 ... Input part 6 ... Extending part 7 ... Engaging part 8 ... Restriction means 10 ... Sun visor body 26 ... Suppressed part 32 ... Mounting Hole 33: locking holes 52, 53: retaining portion 54: first contact portion 55: second contact portion 56a: rotation suppressing portion 70: first locking portion 73: second locking portion

Continued on front page F-term (reference) 3J001 FA02 JC03 JC06 JD22 KA19 KB01 3J022 DA15 EA18 EA41 EB02 EB12 EC22 FA05 FB03 FB07 FB12 FB16 GA07 GA16 GB23 GB24 3J037 AA01 BA02 BB01 CA14 CA17 3J105 AA12 AA08 DA04

Claims (5)

[Claims] 1. A fastener fastened to an attachment portion, wherein the fastener is provided on a rotation torque input portion, an extension portion extending from the input portion, and a part of the extension portion. An engaging portion engaged with the mounting portion, and a restraining means for restraining the extension portion in a predetermined deformed state, wherein the input is performed in a state where the fastener is arranged at a predetermined position of the mounting portion. The extension portion is deformed by the rotation torque input to the portion, and the fastener is attached to the attachment portion by a deformation force generated by the deformation, which changes a distance between the input portion and the engagement portion. By engaging this engagement state with the restraining means,
The fastener according to claim 1, wherein the fastener is fixed to the attachment portion. 2. The fastener according to claim 1, wherein the input portion is insertable into a mounting hole provided in the mounting portion, and is rotated by a rotation torque input to the input portion. And a contact portion that comes into contact with a lower surface of the mounting portion when the input portion is inserted into the mounting hole. Fasteners. 3. The fastener according to claim 1, wherein the restraining means is provided on a first locking portion provided on a distal end side of the extension portion and on an input portion side of the extension portion. The first locking portion and the second locking portion are engaged with each other when the extension portion is deformed by the rotation torque input to the input portion. A fastener characterized by having a configuration. 4. The fastener according to claim 1, wherein the input portion is formed in a substantially triangular shape that can be inserted into a substantially triangular mounting hole provided in the mounting portion. Fasteners featured. 5. A fastening method for fastening a fastener to an attachment portion, wherein an input portion and an engagement portion of the fastener are respectively arranged at predetermined positions of the attachment portion, and the attachment portion is rotated to the input portion. By inputting a torque, the extension portion extending from the input portion and connecting the engagement portion is deformed, and the deformation force generated by the deformation changes the distance between the input portion and the engagement portion. A fastening method in which the engagement portion is engaged with the attachment portion, and the deformation of the extension portion is restrained by restraining means of the fastener, and the fastener is fastened to the attachment portion.