JPH07269539A - Fastening member - Google Patents

Abstract

PURPOSE:To provide a fastening member which is unnecessary to exchange an outer package cover and the like, when a member such as a reinforcing metal fitting is installed to the rear side of the outer package cover of a business machine and the like. CONSTITUTION:When the first member 14 and the second member 10 are fasteded by a screw 9, the locked member 6 and the form variable member 4 of the first fastening member 1 are inserted to the hole 12 of the tubular part 11 of the second member 10, the plate form part 2 of the fastening member 1 is held between the first member 14 and the front end of the tubular part 11, the screw 9 is inserted to holes 15 and 3, and by screwing the screw 9 to the lower hole 8 for tapping of the locked member 6, the form variable member 4 is projected to the outer side in the radius direction so as to be abutted to the inner wall surface of the tubular part 11, and the screw 9, the member 10, and the member 1 4 are connected through the fastening member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening member which is used together with a fastening screw when fastening two members with each other,
In particular, it relates to a fastening member that enables fastening both members without providing a screw hole in one member.

[0002]

2. Description of the Related Art Generally, members such as a hinge member, a reinforcing metal fitting, and a positioning metal fitting are attached to the inner surface side of an outer cover of an office machine or the like. Conventionally, in order to fix the metal fitting and the member to the outer cover. Resin screws are used. The resin screw is a self-tapping screw, and by screwing the resin screw into a pilot hole provided in advance in a resin exterior cover, the member is fastened to the exterior cover while threading the pilot hole. Was there.

[0003]

In the above-described conventional fastening structure, the fastening holding force between the resin exterior cover and the metal fittings fastened to the cover is determined by the screw hole of the cover (formed by the fastening screw). Since it depends only on the screwing relationship between the female screw part of the tapping screw hole) and the male screw part of the fastening screw,
When the screw thread or thread groove of the screw hole is worn, the coupling force between the cover and the metal fittings is reduced. Therefore, even if the outer cover or the metal fittings are not damaged, either of them should be replaced. It had to be done, or both had to be exchanged together, with very uneconomical consequences.

An object of the present invention is to solve the above-mentioned problems in the prior art, and to enable both members to be fastened without directly screwing a fastening screw to one of the two members to be fastened together. The purpose is to provide a fastening member.

[0005]

As one measure for realizing a fastening structure that does not cause the above-mentioned problems, for example, the fastening force between two members does not depend only on the screwing relationship of the fastening screws. It is conceivable that the other engaging structure is also shared. Further, if one of the two members to be fastened to each other is made of a material such as resin that is easily worn, it is desirable that no screw hole be formed in the member.

The present invention has been made based on the above idea, and the fastening member according to the present invention has a restrained portion to be screwed with the fastening screw, and the fastening screw to be screwed to the outer side in the radial direction. In the fastening structure using the fastening member of the present invention, there is a deformable portion that is deformed into and is frictionally engaged with the fastened member. It is not necessary to screw the two together, and therefore, the situation in which the fastening force of both members is reduced due to the wear of the screw hole of one member after fastening is not brought about, and the situation in which both members have to be replaced is brought about. I have no fear.

[0007]

As shown in FIG. 3, the fastening member 1 of the present invention includes the plate-shaped portion 2 which is clamped between the first member 14 and the tip of the tubular portion 11 of the second member 10. There is a constrained portion 6 that is constrained within the tubular portion 11 and that is screwed into the fastening screw 9, and a deformable portion 4 that is deformed radially outward and frictionally engages with the tubular portion 11. Although both members 14 and 10 are coupled via the fastening screw 9 and the fastening member 1 of the present invention, it is not necessary to provide a screw hole in the member 10, so that both members 1
When the binding force of 0 and 14 is reduced, only the fastening member 1 of the present invention needs to be replaced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fastening member according to the present invention and a fastening structure for fastening two members using the fastening member will be described below with reference to FIGS.

In FIG. 1, 14 is a first member having a hole 15 for inserting the fastening screw 9, and 10 is a second member to be fastened to the first member. On the outer surface of the second member 10, a cylindrical portion 11 having a non-circular and non-through hole 12 is provided so as to project, and flat surfaces 13 parallel to each other are formed on the peripheral wall surface of the hole 12. The hole 12 is a non-circular hole.

1 is a fastening member according to the present invention. The member 1 is inserted into the hole 12 and the plate-shaped portion 2 which is abutted on the lower surface of the first member 14 and rests on the tip end surface of the cylindrical portion 11 so as not to rotate in the hole 12. It has a held portion 6 to be held, and a deformable portion 4 connecting the plate-like portion 2 and the restraining portion 6, and these three portions are integrally molded with a resin material.

A screw insertion hole 3 aligned with the hole 15 of the first member 14 is formed through the plate-shaped portion 2, and the plate-shaped portion 2 is mounted on the tip end surface of the tubular portion 11. Diameter part and the tubular part 11
Small-diameter part that fits into the hole 12 (not shown in FIG. 1)
And have.

The outer shape of the constrained portion 6 is the same as the shape of the hole 12 of the tubular portion 11 of the second member 10, and the outer peripheral portion of the constrained portion 6 has a surface 13 on the surface of the hole 12. Two axially parallel surfaces 7 are formed that make contact. Further, a tapping pilot hole 8 into which a fastening screw 9 is to be screwed is provided at the center of the restrained portion 6.

The deformable portion 4 provided between the plate-like portion 2 and the constrained portion 6 has two thin flat cylindrical bodies having the same outer diameter as the outer diameter of the constrained portion 6 and parallel to the axis. It has a shape like a cutout and is composed of two thin wall-shaped portions facing each other with the axis interposed therebetween, and the wall-shaped portions are axially centered when a compressive force in the axial direction is applied to the fastening member 1. Is elastically deformable outward in the radial direction with respect to the deformable portion 4
A rib (projection portion) 5 having a triangular cross-sectional shape is provided on the outer peripheral surface of the so as to project along the circumferential direction. When the deformable portion 4 elastically deforms outward in the radial direction within the hole 12, the rib 5 is pressed against the cylindrical inner wall surface of the hole 12 and frictionally engages between the fastening member 1 and the second member 10. It is the part that generates the binding force.

In order to cause deformation of the deformable portion 4 at the position of the rib 5, the wall thickness of the deformable portion 4 is designed to be minimum at the position of the rib 5, and the plate-shaped portion 2 and The thickness is largest in the part connected to the restricted part 6.

Next, with reference to FIGS. 1 to 3, a work procedure for fastening the first member 14 and the second member 10 using the fastening member 1 of the present invention will be described.

First, as shown in FIG. 2, the fastening member 1 of the present invention is inserted into the hole 12 of the tubular portion 11 of the second member 10, and the plate portion 2 is attached to the tip surface of the tubular portion 11. Put it on top.

Next, the first member 14 is placed on the plate-like portion 2 of the fastening member 1 with the shaft portion of the fastening screw 9 inserted into the hole 15 (clearance hole) of the first member 14. And the fastening screw 9 is placed in the screw insertion hole 3 (clearance hole) of the plate-shaped portion 2.
Insert into. At this time, the tip of the fastening screw 9 enters the tapping pilot hole 8 of the restrained portion 6 of the fastening member 1,
Positioning of the member 14, the member 10 and the fastening member 1 is performed by the screw 9.

Thereafter, when the fastening screw 9 is rotated by a tool such as a screwdriver to screw the screw 9 into the hole 8, the restrained portion 6 is pulled up toward the plate-like portion 2 as the screwing progresses. Therefore, the deformable portion 4 receives a compressive force in the axial direction and the portion of the rib 5 which is the thinnest portion is bent outward, and the rib 5 is pressed against the inner wall surface of the tubular portion 11 to finally As shown in FIG. 3, the first member 14 and the second member 10 are
Is completed.

As described above, by using the fastening member of the present invention, it is not necessary to provide a tapping pilot hole in the second member (that is, it is not necessary to directly screw the fastening screw into the second member). The member and the second member can be fastened.

In order to further increase the coupling force between the fastening member 1 and the second member 10, for example, a circumferential groove that engages with the rib 5 is provided on the circumferential wall surface of the hole 12 of the tubular portion 11. Alternatively, the plate-shaped portion 2 may be provided with a cap portion fitted into the tubular portion 11.

[0021]

As described above, according to the fastening member of the present invention, the fastening screw insertion hole (clearance hole) is formed in only one of the two members to be fastened to each other. Since the members can be fastened, unlike the conventional fastening structure, the fastening force of both members is loosened due to the wear of the screw holes in the other member, and as a result, the other member must be replaced. There is no fear of causing this, and when the fastening force of both members is reduced, only the fastening member of the present invention needs to be replaced, which is very economical.

[Brief description of drawings]

FIG. 1 shows two members 14 using the fastening member 1 of the present invention.
And FIG. 10 is a perspective view of each member in the case of tightening and 10.

2 is a longitudinal section showing a state in which the fastening member 1 is set on the second member 10 in the first work procedure for fastening the two members 14 and 10 using the fastening member 1 shown in FIG. Face view.

FIG. 3 is a vertical cross-sectional view showing a state in which a first member and a second member 10 are fastened by performing a second work procedure subsequent to the work procedure shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fastening member 2 ... Plate part 3 ... Fastening screw insertion hole 4 ... Elastically deformable part 5 ... Rib 6 ... Restrained part 7 ... Axial parallel surface 8 ... Self-tapping pilot hole 9 ... Fastening screw 10 ... No. Second member 11 ... Cylindrical part 12 ... Non-circular hole 13 ... Surface 14 ... First member 15 ... Screw insertion hole

Claims (1)

[Claims] 1. A fastening member for use in a fastening structure in which a first member and a second member are joined via a fastening screw, the fastening member being in contact with the first member and the first member. A plate-shaped portion that is clamped and held between the one member and a part of the second member, a fastening screw insertion hole that penetrates through the plate-shaped portion, and is connected to the plate-shaped portion. And a deformable portion that extends along the axis of the fastening screw insertion hole and is elastically deformable outward in the radial direction with respect to the axis, and a part of the second member that is connected to the deformable portion and that is connected to the deformable portion. A constrained portion whose movement in the rotational direction is constrained by a fastening screw threaded hole provided in the constrained portion centering on the same axis as the axis of the fastening screw insertion hole, A fastening member, wherein the plate-shaped portion, the deformable portion, and the restrained portion are integrally molded of a resin material.