JPH0480244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an expandable clip used, for example, for fixing a plastic bumper of an automobile to a rainforth, or for fixing parts having mutually different coefficients of thermal expansion. be.

Conventional clips of this type include those shown in FIGS. 1A and 1B. As shown in the figure, the clip consists of a main body 1 and a screw member 2. The main body 1 has a flange portion 3 and a leg portion 4 that is vertically disposed on the lower surface of the flange portion 3. The insertion hole 5 for the screw member 2 is formed in the flange portion 3 side, and the notch cavity 6 communicating with the insertion hole 5 is formed in the distal end side. As shown in FIGS. 2A and 2B, after the legs 4 of the main body 1 are inserted into the locking holes H1 and H2 of the automobile's rainforth P and resin bumper B, the legs 4 of the main body 1 are inserted into the insertion holes 5 of the legs 4. When the screw member 2 is forcibly inserted into the hole, the leg portion 4 is inserted into the notch cavity 6 according to the insertion of the screw member 5.
It expands to both sides under the action of the thick wall surface 5a of the insertion hole 5, and works together with the flange portion 3 to grip the hole edges of the rain force P and bumper B, and fix both P and B together. It is something to do.

However, in the case of such conventional clips, the expansion-side outer circumferential surface of the leg portion 4 directly contacts the inner circumferential surface of each of the locking holes H1 and H2, and the expansion of the leg portion 4 is caused by the expansion of the rain force P. Since this occurs immediately after passing through the locking hole H1, the fixed state of the resin bumper B and the reinforcement P is determined solely by the insertion condition of the screw member 2, and if anything, a strong tightening force is required. Accordingly, the resin bumper B is fixed to the reinforcement P.

For this reason, when fixing different members made of resin and metal, such as the above-mentioned resin bumper B and rain force P, distortions and wrinkles may occur particularly on the resin member side due to the difference in their respective coefficients of thermal expansion. However, it had some problems.

Furthermore, as with conventional clips, simply forcing the legs 4 to expand immediately after passing through the locking hole H1 of the rain force P requires a considerable amount of force. Therefore, it cannot be denied that the expansion work that involves inserting screw members becomes difficult.

In view of the problems with conventional clips, the present invention provides a method for effectively absorbing the difference in thermal expansion coefficient between the members such as a resin bumper when fixing the member to a metal or other member by polymerization. This clip was developed with the aim of providing a new clip that allows the leg to be expanded easily, and has a clip that is equivalent to the thickness of the member to which it is attached, on both sides of the leg's expansion side and on the lower surface of the corresponding flange. A configuration was adopted in which spacer pieces having a height of 100 mm are vertically arranged facing each other, and gaps having a constant width are formed on the corresponding outer peripheral surfaces of the spacer pieces and the legs.

Hereinafter, the present invention will be described in detail based on one embodiment illustrating the present invention.
As shown in FIG. 2, it consists of a main body 11 and a screw member 12, similar to the conventional clip, and the main body 11 has a flange portion 13.
The leg part 14 has a leg part 14 vertically installed on the lower surface of the flange part 13, and the leg part 14 forms an insertion hole 15 for the screw member 12 that opens toward the flange part 13 at its longitudinal center, and The insertion hole 15 is provided on the tip side.
This is based on a configuration in which a cutout cavity 16 is formed that communicates with the
Flange portions 13 corresponding to both sides of the leg portions 14 on the expansion side
A pair of spacer pieces 1 having a height equivalent to the thickness of the member to be attached such as the above-mentioned resin bumper are placed on the lower surface of the
7 and 17 are vertically arranged facing each other, and a gap 18 having a constant width is formed between each spacer piece 17 and the corresponding outer peripheral surface of the leg portion 14. In providing the spacer pieces 17, a disk-shaped base 19 is formed adjacent to the flange portion 13 as shown in the figure, and the spacer pieces 17 are integrally hung from the base 19.

Therefore, when fixing the resin bumper B to the reinforcement P as shown in FIG.
After the leg portion 14 of the main body 11 is inserted into the locking hole H1 of the bumper B and the locking hole H2 of the bumper B, if the screw member 12 is inserted into the insertion hole 15 of the leg portion 14, the screw member 12, the leg portion 14 expands to both sides under the action of the notch cavity 16 and the thick wall surface 15a of the insertion hole 15, and as shown in FIG. I will do it.

In such a state, a pair of spacer pieces 17, 17 having a height equivalent to the thickness of the resin bumper B.
The lower end of the bumper comes into contact with the surface of the reinforcement P, effectively suppressing the contact force of the resin bumper B against the reinforcement P from becoming larger than necessary.
As shown in the figure, if the locking hole H2 of the resin bumper B is formed into a long hole shape, the resin bumper B
Even if the resin bumper B thermally expands due to the influence of temperature, the elongated locking hole H1 can effectively absorb the thermal expansion and prevent the resin bumper B from deforming due to a difference in the coefficient of thermal expansion. Become.

Further, in this embodiment, the screw member 12 is inserted into the insertion hole 15 of the leg 14 in such a manner that a space 18 is formed between each spacer piece 17 and the corresponding outer peripheral surface of the leg 14.
When the legs 14 are expanded by inserting it into the inside, the presence of the gap 18 actively allows the base side of the legs 14, which is difficult to expand, to expand. Since it is possible to easily promote the expansion of the entire portion 14 to both sides, the leg portion 14 can be expanded sufficiently and easily without increasing the insertion force of the screw member 12 unnecessarily. At the same time, by expanding the leg portions 14, a strong tightening force is obtained in cooperation with the flange portion 13, so that the resin bumper B
There is no need to worry about it becoming loose.

This means that even if there is a dimensional error between the leg portion 14 and the locking hole H1 on the reinforcement P side,
By sufficiently and easily expanding the leg portions 14 described above, it is possible to absorb this dimensional error, etc. In any case, in order to securely superimpose and fix the resin bumper B on the reinforcement P side, This is an extremely optimal clip.

As described above, by employing the above structure, the clip of the present invention can secure a strong tightening force as a whole when members having different coefficients of thermal expansion are fixed together, and the clip can expand the thermal expansion of both members. Since it is possible to effectively absorb the difference in the amount of water, it is possible to effectively prevent distortions, wrinkles, etc. from occurring in the bumper, especially when used in a resin bumper for an automobile.

Furthermore, by forming a gap between the spacer piece and the corresponding outer circumferential surface of the leg, the leg can be sufficiently and easily expanded without unnecessarily increasing the insertion force of the screw member. Therefore, the workability is extremely improved, and it is also possible to ensure that the member to be attached is securely and firmly fixed.

[Brief explanation of the drawing]

FIG. 1A is an exploded perspective view showing a conventional clip;
Figure B is a sectional view of the main body, Figure 2A is an overall sectional view showing the resin bumper fixed to the rainforth using conventional clips, Figure B is an enlarged sectional view of the main part, and Figure 3A is an enlarged sectional view of the main part. FIG. 4 is an exploded perspective view showing the clip according to the present invention, FIG. 4 is a sectional view of the main body, and FIG. . 11... Main body, 12... Screw member, 13... Flange portion, 14... Leg portion, 15... Insertion hole, 16
...Notch cavity, 17...Spacer piece, 18...
〓Ma, P...Rain force, B...Bumper.

Claims (1)

[Claims] 1. Consisting of a main body and a screw member, the main body has a flange portion and a leg portion suspended from the lower surface of the flange,
The leg portion has an insertion hole for the screw member opened toward the flange portion at the center in the longitudinal direction thereof, and
In a clip configured to form a cutout cavity in the distal end part communicating with the insertion hole, and to insert a screw member into the insertion hole of the leg part to obtain expansion of the leg part to both sides. , Spacer pieces having a height equivalent to the thickness of the member to be attached are vertically provided on the lower surface of the flange corresponding to both sides of the expanded side of the leg, and the corresponding outer circumferential surface of the spacer piece and the leg. A clip characterized by forming a space with a constant width between the clips.