JP2546311Y2 - Drip-proof screw receiving structure - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to the structure of holes for screws for fixing electronic devices and components, and is particularly suitable for preventing intrusion of dust and water droplets. The present invention relates to a drip screw receiving structure.

(B) Conventional Art Conventionally, as shown in FIGS. 5 and 6, there has been provided a structure of a screw hole provided in a housing of an electronic device for fixing an electronic device or a component.

FIG. 5 is a cross-sectional view showing a screw hole structure for mounting a housing formed of a synthetic resin, and FIG. 6 is a cross-sectional view showing a structure in which the screw hole for mounting the housing is a blind hole.

In the figure, reference numeral 2 denotes a metal bush inserted to reinforce a screw hole for attaching the housing to the mount, 2a denotes a screw hole of the bush 2, 11 denotes a housing of an electronic device molded from a synthetic resin material, and 11a denotes a screw. The bottom of the bag hole, 12 is a metal bush inserted for the screw hole for mounting the housing, etc.
12a is a screw hole provided in the bush 12.

As shown in FIGS. 5 and 6, a hole for a screw for mounting a housing or a component of a conventional electronic device is a synthetic resin housing formed by insert-molding a bush 2 having a screw hole 2a.
A case made of a synthetic resin material in which the bush 12 is insert-molded in order to prevent the penetration of the screw hole 2a or the entry of dust and water droplets, and the screw hole 12a is closed by a thick bottom portion 11a. It was like.

(C) Problems to be Solved by the Invention However, the structure of the screw hole provided in the above-described conventional housing has a structure in which the motor hole is provided without fixing the component or fixing to the mount because the screw hole is penetrated. When used in a car or in a car, there is a problem that dust and water droplets enter through the threaded screw holes.

In addition, when the case is fixed to the mount, the bush must be sufficiently long so that the tip of the screw does not contact the bottom of the screw hole when the case is fixed to the mount. However, there is a problem that it becomes an obstacle to miniaturization of electronic devices.

Further, when the housing of the electronic device is fixed to a mount or the like with a mounting screw, the mounting screw is screwed and the bottom of the screw bag hole is pierced by the screw tip, and the bottom of the bottom portion is screwed in by the mounting screw. There is a problem that the broken resin fragments at the bottom are scattered inside the housing, and a problem due to the broken pieces occurs inside the housing.

Further, in the case of a blind hole, the bush becomes long and a large amount of synthetic resin material is used, so that there is a problem that the cost of both parts is increased.

This invention has been made in view of the above points,
Its purpose is to eliminate the disadvantages of the conventional example, prevent dust and water droplets from entering through the screw holes of the housing, and prevent problems inside the housing due to broken resin debris at the bottom, thereby reducing costs. It is to provide a drip screw receiving structure.

(D) Means for Solving the Problem The drip-proof screw receiving structure of the present invention is provided in a housing of an electronic device manufactured using a mold such as a synthetic resin molded or metal die-cast product. The screw hole is formed as a blind hole, and the bottom is made thin so as to prevent dust and water droplets from entering, and to be easily broken by screwing.

When the bottom of the screw hole is thinned near the center of the screw hole and the screw is screwed and the bottom is damaged, the thinnest part is damaged and the broken pieces are scattered. It is formed so as to be attached to the housing.

(E) Action According to the present invention, since the bottom is provided in the screw hole, dust and water droplets do not enter even when the screw hole is not used. In addition, the bottom is thinner, and the center is the thinnest near the center, so when fixing it to a mount or the like, the screw can be screwed in and the bottom can be easily broken at the tip of the screw. The part is damaged, and the area around the bottom is not damaged.

(F) Embodiment An embodiment of a drip-proof screw receiving structure according to the present invention will be described with reference to FIG. 1 to FIG.

The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a cross-sectional view showing a drip-proof screw receiving structure of the present invention, FIG. 2 is a cross-sectional view showing a state in which a housing of an electronic device is fixed to a mount with screws, and FIG. FIG. 4 (A) is a cross-sectional view showing the drip-proof screw receiving structure of the present invention.
(B) and (C) are sectional views showing a modified example of the bottom thin portion in the drip-proof screw receiving structure of the present invention, showing a conical shape, a spherical shape, and a concave shape at the center of the spherical surface, respectively.

In the drawing, 1 is a housing of an electronic device made of a synthetic resin material or an aluminum material using a mold, for example, a housing of an electronic device using an ABS resin, 1a is a bottom portion closed with a thin hole with a screw hole, 1b is the thinnest portion formed near the center of the bottom 1a, for example, the center is formed so that damage by the tip of the screw is easiest
1c is a uniform thin bottom with a uniform thin portion, 1d is a conical uniform thin bottom, 1e is a spherical uniform thin bottom, 1f is a concave thin bottom at the center of the spherical surface, and 3 is slightly smaller than the depth of the screw hole 2a. The large screw 4 is a mount for fixing the electronic device or a component for fixing the electronic device, for example, a mount.

As shown in FIG. 1 to FIG. 3, the drip-proof screw receiving structure of the housing of the electronic device or the like of the present invention is, for example, that a bush 2 having a screw hole 2a is inserted into a housing 1 using an ABS resin material. It is formed such that the bottom portion 1a of the screw hole 2a is made thin and the center portion is made the thinnest portion 1b.

Thus, even when the housing 1 is not fixed to the mount 4 and therefore the mounting screw 3 is not screwed into the screw hole 2a, dust and water drops do not enter.

When the housing 1 of the electronic device is fixed to the mount 4,
Since the bottoms 1a and 1c are thin, if a screw 3 larger than the depth of the screw hole 2a is screwed, the screw 3 is easily damaged by the tip of the screw 3.

In particular, when the screw 3 is screwed into the screw hole 2a having the center portion of the bottom portion 1a as the thinnest portion 1b, the thinnest portion 1b is damaged, and the periphery of the bottom portion 1a is not damaged and the cross section is substantially as shown in FIG. And the bottom
The broken pieces of 1a and the thinnest portion 1b are not scattered and are stuck to the housing.

When the screw 3 is screwed into the screw hole 2a as described above, the screw 3 is tightened with the mounting screw 3, so that dust and water droplets do not enter from this portion.

Modifications of the screw hole 2a having a dustproof and drip-proof action are shown in FIGS. 4A, 4B, and 4C. In the structures shown in FIGS. The broken piece at the time of breakage due to the screw 3 is attached to the housing. In the structure shown in FIG. 3B, damage by the screw 3 is particularly easy.

(G) Effect of the Invention According to the drip-proof screw receiving structure according to the invention, there is an effect that dust and water droplets can be prevented from entering the screw hole even when the screw hole of the housing is not used.

Also, when fixing the housing to the mount, the bottom of the screw hole can be easily broken by the tip of the mounting screw, so it is not necessary to make the bush longer with a margin, and the bush can be shortened. This has the effect of making it easier.

Furthermore, since the resin at the bottom part damaged by the mounting screw is not scattered and adheres to the housing, there is an effect that the occurrence of problems due to fragments can be prevented.

In addition, it has excellent features such as a simple structure, a short bushing, a low cost configuration, and easy implementation.

[Brief description of the drawings]

1 to 4 show an embodiment of a drip-proof screw receiving structure according to the present invention, FIG. 1 is a cross-sectional view showing a drip-proof screw receiving structure of the present invention, and FIG. FIG. 3 is a cross-sectional view showing a state of being fixed to a mount with screws, FIG. 3 is a cross-sectional view showing a drip-proof screw receiving structure of the present invention in which the bottom is made uniform and thin, and FIG.
FIGS. 7A, 7B, and 7C are sectional views showing modified examples of the bottom thin portion in the drip-proof screw receiving structure of the present invention, showing a conical shape, a spherical shape, and a concave shape at the center of the spherical surface, respectively. 5 and 6 show the structure of a conventional mounting screw hole, FIG. 5 is a cross-sectional view showing a screw hole structure for mounting a housing molded of synthetic resin, and FIG. It is sectional drawing which shows the structure which made the hole for screws to be attached a blind hole. Explanation of main symbols 1: Housing 1a: Bottom 1b: Thinnest 1c: Uniform thin bottom 1d: Conical uniform thin bottom 1e: Spherical uniform thin bottom 1f: Central recessed uniform thin bottom 2: Metal Bush 2a: Screw hole 3: Screw 4: Mount 11: Housing 11a: Bottom 12: Bush 12a: Screw hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A housing for an electronic device manufactured by using a mold such as a synthetic resin molding or a metal die-cast product, wherein a screw hole provided in the housing is a blind hole, and a bottom portion is thin. As described above, the bottom portion is usually formed so as to prevent dust and water droplets from entering, and is easily damaged by screwing of the screw, and the thickness of the bottom portion of the screw hole near the center portion is reduced. When the screw is screwed down and the bottom is made thinnest, the thinnest part is broken, and the broken piece is not scattered and is formed so as to be attached to the housing. Receiving structure. 2. A housing for an electronic device manufactured by using a mold such as a synthetic resin molded or metal die-cast product, wherein a screw hole provided in the housing is a blind hole, and a bottom portion has a wall thickness. As a thin wall, the bottom portion is usually formed so as to prevent intrusion of dust and water droplets, and is easily damaged by screwing of the screw, and the bottom portion of the screw hole is formed as a conical uniform thin bottom portion or a spherical uniform thin bottom portion. When the screw is screwed and the bottom is damaged,
A drip-proof screw receiving structure, characterized in that the thin bottom portion is broken and the broken piece is attached to the housing without scattering.