JPH0243189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fixing device for screwing a male screw into a support plate such as a resin bumper for a vehicle to tighten an object to be fixed such as a license plate.

<Prior Art> As shown in FIG. 1, such a conventional fixing device has a resin bumper A with a sheet metal belt-shaped bracket C attached from the back side through a mounting hole A', and a resin bumper of this bracket C. Align the hole drilled in the folded part facing A (not shown) with the hole in the license plate B, which is the object to be fixed, insert the male screw D into the hole, and tighten the nut N from the back side. It is something that sticks.

Therefore, tightening with the nut N not only becomes a so-called blind operation from the back side, but also acts on the metal bracket C, which causes rust to form between the bracket C and the license plate B. There is a possibility that the contact part will corrode and the license plate B will fall off due to vibrations during driving.

Further, this method is not satisfactory in terms of weight and number of component parts, and the workability is also not good.

Therefore, we used plastic to eliminate the fear of rust, and to avoid blind work, we developed a technology that could be supported by simply inserting one side into the other.
Techniques such as the combination rivet disclosed in Japanese Patent No. 9531 have been proposed.

<Problems to be Solved by the Invention> However, according to such a configuration, if the supported member is statically supported, it cannot be adopted in a vehicle that travels on rough roads as in the present invention. However, if the rivets are simply combined, there is still the possibility that the license plate will fall off.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fixing device that prevents a fixed object such as a license plate from falling off from a vehicle while driving.

The present invention will be explained below with reference to the illustrated embodiments.

2 to 6 show an embodiment of the present invention, in which reference numeral 1 indicates a front member and 2 indicates a back member, and both members 1 and 2 are each made of a suitable plastic.

The front member 1 includes a first plate portion 3 and a first plate portion 3.
first protrusions 16, 16 protruding from the inner surface 3'side;
A first opening 4 formed in the center of the first plate part 3 and a quarter opening 4 having an outer diameter slightly smaller than the edge of the first opening 4 or the inner diameter from the inner surface 3' side of the first plate part 3. It consists of first engaging portions 5, 5 which are oppositely protruded and have a single arc cross section.

The back member 2 includes a second plate part 6, second protrusions 16', 16' protruding from the inner surface 6' side of the second plate part 6,
a second opening 7 formed in the center of the second plate portion 6 and aligned with the first opening 4 of the front member 1;
The second protrusions 16', 16' and the second protrusions 16' and 16' are located at positions substantially perpendicularly different from each other with respect to the first engaging portions 5, 5, facing each other with quarter-arc cross sections whose outer diameters are the edges. The second plate part 6 protrudes from the inner surface 6' side of the second plate part 6 by the thickness of the support plate A, and also by approximately the same length when the first engaging parts 5, 5 are engaged. It consists of second engaging parts 8, 8 protruding from the outer surface 6'' side.

When the first and second engaging parts 5 and 8 are engaged from the front and back sides through the hole _a1 of the support plate A, the chevrons or The serrated teeth 5a and 8a mesh with each other to enable temporary fixing.

By screwing the male screw D into the first and second engaging parts 5 and 8, the inner surfaces of the first and second engaging parts 5 and 8 are carved, and when a screwing force is applied, the first and second engaging parts are engaged. Part 5, 8
tends to warp and escape in the direction of the outer circumference. In order to prevent this, a radial first reinforcing wall 14 is provided so that the edge of the second opening 7 protruding from the outer surface 6'' side of the back member 2 can come into contact with the outer peripheral surface of the first engaging portions 5, 5. The first reinforcing wall 1 is provided in a protruding manner to prevent the first engaging portions 5, 5 from opening.
It will be blocked by interfering with 4. Similarly, a second reinforcing wall 15 is provided so as to protrude from the outer surface 6'' of the back member 2 to the outer circumferential surface of the second engaging part 8, so that the second engaging part 8 is prevented from opening. This will interfere with the second reinforcing wall 15 and be blocked.

The back member 2 has a hole a ₂ formed in the engaging portion A,
It is provided with protruding pieces 9, 9 which are anti-rotation devices that protrude into _a2 and prevent rotation.

Of course, there may be only one protruding piece 9, 9, or they may be provided on the inner surface 3' of the front member 1.

To fix the number plate B, which is the object to be fixed, to the surface side of the resin bumper A, which is the support plate, with the male screw D, both members 1 and 2 should be faced with the inner surfaces 3 and 6' with the resin bumper A separated, and should be oriented in the correct direction. do.

Then, from the front side, the first engaging parts 5, 5 of the front member 1
and the tips of the second engaging portions 8 protruding from the inner surface 6' of the back member 2 from the back side are respectively inserted into the holes _a1 with different angles.

As a result, the first engaging portion 5 of the front member 1 enters into the arcuate space between the second engaging portions 8, 8 provided in the opening 7 of the back member 2, and the teeth 5a and 8a eventually engage. Since the projecting pieces 9 and 9 enter the hole a ₂ , both members 1 and 2 are prevented from rotating around the hole a ₁ .

As a result, the first and second engaging parts 5 and 8 of both members 1 and 2 complement each other to form a screw hole 10 in the back member 2, so that the license plate B can be attached to the first plate part 3 of the front member 1. Screw the male screw D from the front side of the license plate B into the screw hole 10, carve a male screw on the inner periphery of the screw hole 10, and screw the license plate B into the plate part with the screw head D'. Therefore, the first engaging portion 5 of the front member 1 and the second engaging portion 8 of the back member 2 not only maintain the engaging relationship between the two, but also simultaneously Grommet (screw receiver) that forms a screw hole
It can be understood that it fulfills the function of

Because of this configuration, it is difficult for the resin bumper A made of materials such as polypropylene and polyurethane foam to maintain a constant thickness due to molding errors, thermal expansion, etc., and there is a need to use expensive materials. However, according to this method, the position (depth) of engagement (meshing) between the two can be selected.

<Effects> The present invention configured as described above can significantly improve workability.

In other words, by inserting the front member and the back member into a support plate such as a bumper from the front and back, they can be engaged and temporarily fixed, and the screwing force can be used in the process of attaching the object to be fixed such as a license plate. Both members can be firmly fixed together, and it can also be reused when replacing the fixed object. It will be clear from the figure that these screws can be installed from one side only.

The fixing device according to the present invention can be implemented in various ways within the scope of its gist.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of a conventional fixing tool, and FIGS. 2 to 6 are views showing an embodiment of the present invention.
The figure is an exploded perspective view of the front and back members. Figure 3 is a front view showing the inner surface on the right half of the front member and the outer surface on the left half. Figure 4 is a front view showing the inner surface on the right half of the back member and the inner surface on the left half. 5 is a front view showing the outer surface, FIG. 5 is a longitudinal sectional view of the device in use, and FIG. 6 is a horizontal sectional view. DESCRIPTION OF SYMBOLS 1... Front member, 2... Back member, 3... First plate part of front member, 4... First opening, 5... First engaging part, 5a... Teeth,
6...Second plate part of the back member, 6'...Inner surface, 6''...Outer surface,
7... Second opening, 8... Second engaging portion, 9... Rotation prevention device, 14, 15... First and second reinforcing walls, A... Bumper (support plate), B... License plate (fixed object).

Claims (1)

[Scope of Claims] 1. Consists of a plastic front member and a back member that are assembled on the front and back sides of a support plate with the support plate in between, and the front member includes a first plate portion and an inner surface of the first plate portion. A raised first protrusion, a first opening formed in the first protrusion, and a quarter arc cross section from the inner surface of the first plate portion with the first opening edge as the outer diameter. the back member includes a second plate part, a second protrusion protruding from the inner surface of the second plate part, and a first engaging part protruding toward the second plate part; a second opening that aligns with the first opening of the front member; and a quarter-arc cross section whose outer diameter is the edge of the second opening, which face each other and are substantially perpendicular to the first engaging portion. In this position, the second protrusion protrudes from the inner surface of the second plate portion by the thickness of the support plate, and when the first engagement portion engages, the second protrusion protrudes from the inner surface of the second plate portion by approximately the same length. and a second engaging part protruding from the outer surface side of the second plate part, and when the first and second engaging parts are engaged from the front and back sides through the holes of the support plate, the first and second engaging parts The teeth formed on the ends of the connector mesh with each other to enable temporary fixing, and by screwing the male screws into the first and second engaging parts, the inner surfaces of the first and second engaging parts are carved. The second opening edge protruding from the outer surface of the backing member has a radial shape that can be in contact with the outer circumferential surface of the first engaging portion. 1st
A second reinforcing wall protrudes from the outer surface of the reinforcing wall and the back member to extend over the outer peripheral surface of the second engaging portion, and at least one of the front member and the back member includes a support plate. A fixing device characterized by being equipped with a rotation prevention device that plunges into and stops rotation.