JPH0610928A - Fitting button - Google Patents

Abstract

PURPOSE:To provide a synthetic resin fitting button capable of keeping a desired performance even under a condition as being exposed to water. CONSTITUTION:A fitting button performs the fixing of another part by the fitting of a female part 10 having a hollow part on the top end and a male member 20 to be fitted into the hollow part. The male and female members are formed of a waterproof synthetic resin. A circumferential projection 15 is formed on the inner circumferential surface of the hollow part of the female member 10, a circumferential projection 22 is also formed on the male member surface, and the fitting and fixing is performed by the engagement of such circumferential projections. Thus, a fitting button never causing a looseness in the engagement even when dipped in rainwater can be provided, and it can be not only adapted to the assembling of a mud guard, but also sufficiently utilized in, for example, the joint part of an oil fence or pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mating button made of synthetic resin which maintains desired performance even under conditions such as splashing with water.

[0002]

2. Description of the Related Art A mat guard having a net made of a linear lattice made of synthetic resin fixed to a back plate with a button is attached to a rear side of a vehicle tire in order to prevent water splashing in a rainy day of the automobile. It is a device that prevents water from splashing. In fixing both of them, a synthetic resin pin typified by nylon or the like having a hollow end from the back side is inserted into a play hole provided around the back plate which serves as the base of the mudguard. Then, project the tip of this pin and fit the net here, fit a similar synthetic resin button from the top of the net through a holding plate into the hollow part at the tip of the pin, and use the head of the button to attach the net. The structure of holding down was adopted.

[0003]

In such a mudguard, as a matter of course, the pins and buttons are exposed to rainwater, and the synthetic resin pins and buttons used here are affected by rainwater. It should not be received. However, the nylon resin that is favorably used in these productions is a synthetic resin that is quite rich in water absorption. It absorbs water, expands and softens, and the fitting between the two becomes loose. There was a defect that the fitting was disengaged due to the addition of vibration and the like.

The present invention is intended to improve a fitting button used under such a condition that it is exposed to rainwater, and a synthetic resin adopted while devising a fitting structure thereof. It has been specified.

[0005]

The present invention adopts the following constitution in order to achieve the above object. That is, according to the present invention, in a fitting button for fixing another component by fitting a female member having a hollow portion at its tip and a male member fitted in the hollow portion, the male and female members are water resistant. Fitting that is made of synthetic resin and has a circumferential projection formed on the inner peripheral surface of the hollow portion of the female member, while forming a circumferential projection on the surface of the male member, and is fitted and fixed by the engagement of the circumferential projection. As a button, the synthetic resin used here is polyacetal
The present invention relates to a fitting button which is a resin or a polycarbonate resin.

[0006] In particular, as a usage example thereof, a fitting button used for fixing a mudguard hanging to the rear side of a tire of a vehicle, the diameter of a female member having a hollow portion at its tip is Use one that is larger than the grid spacing of the net members,
This is inserted from the back side into the play hole formed in the back plate, its tip projects from the back plate, the grid of the net member is inserted into the tip, and the grid is inserted into the circumferential groove provided on the outer periphery of the female member. The pressing plate is brought into contact with the engaging member while maintaining this state, and the umbrella-shaped male member is fitted into the hollow portion formed at the tip of the female member from above the pressing plate to form a mudguard to which the net is fixed. It is such a thing.

[0007]

The present invention is a fitting button applicable to a member such as a mudguard which is constantly exposed to rainwater, and is composed of a male and female member, which is structurally sufficiently engaged and has a material thereof. Even if there is water, for example, a polyacetal resin or a polycarbonate resin having water resistance is used, and the desired engagement is maintained as it is without absorbing rainwater.

[0008]

SPECIFIC EXAMPLE Hereinafter, the fitting button of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a partially cutaway side view of a fitting button of the present invention formed for use in a mudguard.

This fitting button is made up of a female member 10 and a male member 20.
And is made of a polyacetal resin having extremely low water absorption. Female member 10
Has a head portion 11 at one end and a hollow portion 12 at the tip, and a circumferential groove 13 is formed on the outer periphery on the tip side. The outer diameter of the female member 10 is made larger than the lattice spacing of the net, which will be described later. Further, a peripheral projection 14 is formed on the inner peripheral surface of the hollow portion 12 and is used for engagement with the male member 20.

On the other hand, the male member 20 is provided with an umbrella-shaped head portion 21, and a peripheral projection 22 for engaging with the peripheral projection 14 formed in the hollow portion 12 is formed on the outer peripheral surface thereof. When the male member 20 is press-fitted into the hollow portion 12 of the female member 10 and the circumferential ridges 14 and 22 of both members engage with each other to provide pull-out resistance, when normally used in a mudguard, It is preferable that the pulling force is 20 kgf or more.

The present invention is also characterized in that the material forming the button is changed to a resin having more water resistance than the conventional nylon resin, for example, polyacetal resin, and even if the button comes in contact with rainwater. The resin does not absorb water to expand or soften, and the dimensional accuracy and strength of the member are maintained as expected. Therefore, the fitting force of the button does not decrease.

The fitting button shown in FIG. 1 was formed of a nylon resin, and a tensile test was performed with the one formed of the polyacetal resin of the present invention to examine its effect. The test is to measure the force when pulling out immediately after fitting both members,
On the other hand, the tensile force after immersion in 100 ° C. water for one week was measured and compared. In the fitting button, the fitting depth between the hollow portion 12 and the male member 20 was 15 mm, and the diameter of the male member 20 and the diameter of the hollow portion 12 were 6 mm.

Hereinafter, the test results will be referred to as indexes. Regarding the tensile force immediately after fitting, assuming that the tensile force of the conventional button is 100, the button of the present invention has a tensile force of 150.
And has an extremely large tensile force.

On the other hand, in the button after being immersed in water,
It was found that the conventional button was reduced to 38, and could hardly be used. However, it was found that the button of the present invention shows 125, which retains a tensile force equal to or higher than that immediately after the fitting of the conventional button.

FIG. 2 is a plan view of a mudguard using the fitting button of the present invention, and FIG. 3 is a partially enlarged sectional view of the mudguard in the vicinity of the fitting button. In the figure, reference numeral 30 indicates a back plate of the mudguard, and an edge portion 3 around the back plate.
A through hole 32 is formed at 1. And this through hole 32
The female member 10 is inserted therethrough and is formed in a large number on the peripheral edge portion 31.

Now, the female member 10 is formed in the through hole 32.
Is inserted from the back side, and the tip end projects from the circumferential groove 13 from the back plate 30. The outer diameter of this female member 10 is
It is larger than the lattice spacing of the net described below.

Reference numeral 40 is a net for reducing splashes generated from the tire, which is composed of a linear body 41 made of synthetic resin having a triangular cross section, which is inserted into a protruding portion of the female member 10 from the back plate 30 and has a circumference. The linear body 41 is engaged in the groove 13, and the pressing plate 42 is brought into contact with the net 40 while maintaining this state. Further, in this state, the male member 20 is press-fitted into the hollow portion 12 of the female member 10, and the holding plate 42 is pressed and fixed by the head portion 21 of the male member 20.

The cross-sectional shape of the linear body 41 forming the net 40 is not limited to a triangle, but in the case of a circular cross-section, for example, the circumferential groove 13 provided on the outer circumference of the female member 10 should be an arc. Can increase the degree of engagement.

According to such a mudguard, the net is supported not only by the circumferential groove provided on the outer periphery of the female member but also by the holding plate, which not only facilitates the assembling work, but also Even if the fitting button gets wet with rainwater during traveling, the engagement does not loosen, and there is no danger of the net coming off due to this.

[0020]

As described above, the present invention can provide a fitting button that does not loosen even when immersed in rainwater, and is used for assembling a mudguard or the like. In addition, for example, it can be sufficiently used for joints of oil fences and pipes.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a fitting button of the present invention.

FIG. 2 is a mudguard using the fitting button of the present invention.
FIG.

3 is a partially enlarged cross-sectional view of the mudguard near the fitting button of FIG.

[Explanation of symbols]

 10 ... Female member, 11 ... Head of female member, 12 ... Hollow portion of female member tip, 13 ... Circumferential groove provided on outer periphery of female member, 14 ... Circumferential projection provided in hollow portion, 20 ... Male member, 21 ... Umbrella head of male member, 22 ... Circumferential ridges provided on outer periphery of male member, 30 ... Rear plate of mudguard, 31 ... Surrounding edge, 32: through hole, 40: net, 41: linear body, 42: presser plate.

Claims (2)

[Claims] 1. A fitting button for fixing other parts by fitting a female member having a hollow portion at its tip and a male member fitted in the hollow portion, wherein the male and female members are water-resistant composites. Fitting button made of resin and having a circumferential projection formed on the inner peripheral surface of the hollow portion of the female member and a circumferential projection formed on the male member surface, and fitted and fixed by the engagement of the circumferential projection. . 2. The fitting button according to claim 1, wherein the male and female members are made of polyacetal resin or polycarbonate resin.