JP2880028B2 - Fastening member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening member for fastening a member to be fastened comprising at least two plate-like members.

[0002]

2. Description of the Related Art Conventionally, as a fastening member for fastening a member to be fastened comprising at least two plate-like members, there is a so-called snap-fit fastening member described below.

FIG. 5 shows a conventional fastening method using a fastening member, in which (A) is a sectional view of a main part showing a state in which the fastening member is being fastened, and (B) is a sectional view of a main part showing a state in which the fastening is completed. It is.

A conventional fastening member 21 has hemispherical projections 22 and 23 having cross-sectional dimensions larger than the cross-sectional dimension of the rod-shaped body 24 at both ends of the rod-shaped body 24, respectively.
A slit 25 extending from 2 to the other protrusion 23
Is formed, and the one protruding portion 22 and the rod-shaped body 24 are elastically deformed in the radial direction and can be reduced. FIG.
(A), the fastening member 21 is pushed in the direction of the arrow from one plate-like body 26 side into a hole 28 that penetrates two superposed plate-like bodies 26 and 27 as members to be fastened. Then, the one protruding portion 22 and the rod-shaped body 24 are elastically deformed by the reaction force from the inner peripheral surface of the hole 28 acting on the one protruding portion 22, contracted in the radial direction, and inserted into the hole 28, and The protruding portion 22 protrudes outward from the opening of the other plate-like body 27 and returns to its original shape. Thereby, one protrusion 22 of the fastening member 21 is engaged with the opening periphery of the other plate-like body 27, and the other protrusion 23 is engaged with the opening periphery of the one plate-like body 26. Thus, the two plate-like bodies 26 and 27 are fastened.

[0005]

According to the above-mentioned prior art, the member to be fastened can be fastened only by pushing the fastening member into the hole at the time of fastening. Therefore, compared with the fastening method using screws, bolts and nuts. The fastening operation is simple. However, when disassembling products for product recycling,
The following inconvenience occurs.

In order to release the fastening without damaging the fastening member or the plate-like body which is the member to be fastened, it is necessary to radially reduce one of the protruding portions formed with the slits and to remove it from the hole. However, in general, there is often one protruding portion having a slot formed on the inner side of the product, which has a problem in that the operation of releasing the fastening is hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to facilitate and quickly perform fastening and unfastening operations without damaging a fastening member or a member to be fastened. It is intended to realize a member.

[0008]

In order to achieve the above object, a fastening member according to the present invention has, at both ends of a rod, protrusions larger than the cross-sectional dimension of the rod, and one of the protrusions has a rod-like shape. A fastening member having a slit extending to a body, wherein a surface of the one of the projections having the slit and facing the other of the projections is a conical surface, and the conical surface has a spiral shape. A groove having a shape of a circle is formed.

[0009]

The fastening member can be fastened by pushing the fastening member into the hole passing through the member to be fastened from one of the protruding portions on which the slit is formed. Conversely, when releasing the fastening, if the other protruding part side is rotated by a rotating tool or the like,
By the screw action of the spiral groove and the edge of the opening of the hole that comes into contact with the spiral groove, the fastening member moves toward the other protruding portion and is drawn into the hole. As a result, the one protruding portion and the rod-shaped body are elastically deformed by the reaction force from the inner peripheral surface of the hole acting on the one protruding portion, and are reduced in the radial direction, so that the fastening member can be pulled out from the hole.

[0010]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment, in which (A) is a longitudinal sectional view and (B) is a plan view.

The fastening member 1 of the present embodiment has, at one end of the rod 4, one substantially spherical projection 2 having a cross-sectional dimension larger than the cross-sectional dimension of the rod 4, and the other end. Has a columnar other protrusion 3 having a cross-sectional dimension larger than the cross-sectional dimension of the rod-shaped body 4. In addition, the rod-shaped body 4
Is formed, and a surface of the one protruding portion 2 facing the other protruding portion 3 on the rod-like body side is formed in a conical surface, and a spiral groove 7 is formed in the conical surface. Is formed. For this reason, the rod-shaped body 4 is elastically deformable, and when one of the protrusions 2 is pressed from the direction in which the slit 5 is sandwiched, the rod-shaped body 4 is elastically deformed within a range where the opposing surfaces of the slit 5 abut. When the pressure is released, it returns to its original shape.

In this embodiment, a hexagonal hole 6 is formed on the surface of the other protrusion 3 on the side opposite to the rod-like body.

Next, a method of fastening and releasing the fastening using the fastening member of the present embodiment will be described with reference to FIG.

In the case of fastening, similarly to the conventional example shown in FIG. 5, one of the projections 2 on which the slit 5 is formed is inserted into the holes passing through the two plate-like bodies 8 and 9 as members to be fastened. 10 and then pushed in. Then, the reaction force from the inner peripheral surface of the hole 10 acting on the outer peripheral surface of the one protruding portion 2 causes the one protruding portion 2 and the rod-shaped body 4 to reduce the gap between the slits 5, that is, in the radial direction. It contracts by elastic deformation and is inserted into the hole 10, and one protruding portion 2 protrudes outward from the opening of the hole 10 of one plate-like body 8 to return to its original shape. As a result, a part of the spiral groove 7 of one of the protrusions 2 of the fastening member 1 is locked to the peripheral portion of the opening of the hole 10 of the one plate-shaped body 8, and the other protrusion 3 is connected to the other plate. The two plate-shaped members 8 are engaged with the periphery of the opening of the hole 10 of the plate-shaped member 9,
9 is concluded.

In order to release the fastening, a wrench is engaged with the hexagonal hole 6 of the other protruding portion 3 to rotate the fastening member 1 in a predetermined direction (the direction of movement in the direction of the arrow). Is engaged with the periphery of the opening, so that one of the protrusions 2 of the fastening member 1 is moved into the hole 10 by a screw action as if it were a screw. As a result, the reaction force from the inner peripheral surface of the hole 10 acting on the one protrusion 2 causes
One protruding portion 2 and the rod-shaped body 4 are elastically deformed and contract in the radial direction, and can be pulled out from the other protruding portion 3 side.

Next, a second embodiment will be described.

As shown in FIGS. 3A and 3B, the fastening member 11 of the present embodiment comprises a rod-shaped body 14, one protruding portion 12 and a slit 15 having the same shape as in the first embodiment. Mochi,
Since only the shape of the other protruding portion 13 is different, the description of the same portion is omitted, and the different portion will be described.

The other protruding portion 13 has a substantially hemispherical shape, and has a groove 16 at the top thereof, into which a tip of a driver or the like can be fitted. Needless to say, this groove may have a cross shape.

In this embodiment, since the processing is simpler than in the first embodiment, the manufacturing cost is reduced.

FIG. 4 is a sectional view of a main part showing a modification of the fastening method using the fastening member according to the second embodiment of the present invention. In this modification, the edge of the opening of the hole 20 of one plate-like body 18 is chamfered, and the spiral groove 1 of the fastening member 11 is formed on the chamfered surface.
Numeral 7 is a spiral groove 18a to be engaged.

In the present modification, the engagement between the spiral grooves 17 and 18a is improved, so that the fastening can be more easily released.

In the present invention, the external shape of the other protruding portion may be various shapes such as a polygonal column and an elliptical column in addition to the above embodiments. Further, the slit is provided to be elastically deformable to be freely deformable in the radial direction, and the number thereof may be two or more according to the material of the fastening member and the like.

[0024]

Since the present invention is configured as described above, the following effects can be obtained.

The work of fastening and unfastening can be performed easily and quickly, and the fastening can be canceled without damaging the fastening member or the member to be fastened. Therefore, the member to be fastened can be disassembled and reused.

[Brief description of the drawings]

1A and 1B show a first embodiment of a fastening member according to the present invention, and FIG.
Is a longitudinal sectional view, and (B) is a plan view.

2A and 2B show an example of a method of fastening and releasing using the fastening member shown in FIG. 1, wherein FIG. 2A is a sectional view of a main part showing a state at the time of fastening, and FIG. It is a fragmentary sectional view.

FIG. 3 shows a second embodiment of the fastening member of the present invention, and (A)
Is a longitudinal sectional view, and (B) is a plan view.

FIG. 4 is a sectional view of a main part showing a modification of the fastening method using the fastening member shown in FIG.

5A and 5B show a conventional fastening member and a fastening method using the same, in which FIG. 5A is a sectional view of a main part showing a state in the middle of fastening, and FIG. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,11 Fastening member 2,12 One protruding part 3,13 The other protruding part 4,14 Bar-shaped body 5,15 Slot 6 Hexagon hole 7,17 Spiral groove 16 Groove 8,18 One plate-shaped body 9,19 The other plate-shaped body 10, 20 holes

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16B 19/00

Claims (2)

(57) [Claims] 1. A fastening member having protrusions at both ends of a rod-shaped body that are larger than a cross-sectional dimension of the rod-shaped body, and a slit extending from one of the protrusions to the rod-shaped body is formed. A fastening member, wherein a surface of one of the protrusions having the split and facing the other protrusion is a conical surface, and a spiral groove is formed in the conical surface. 2. The fastening member according to claim 1, wherein an engagement portion for engaging a rotary tool is formed on an outer surface of the other protrusion.