JPH0342706Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a waterproof case in which a tongue piece that comes into contact with an elastic member and a base is provided at the corner of the case.

[Conventional technology]

Conventionally, there is a waterproof case disclosed in, for example, Japanese Utility Model Application Publication No. 55-7293.

In this conventional waterproof case, a step into which the lid fits is formed in the opening of the case, a pool is formed in this step to prevent the filling sealant from flowing into the case, and the inner periphery of this pool is formed as described above. It had a structure separated from the lid body.

[Problem that the invention attempts to solve]

The above-mentioned conventional technology had many problems as described below.

First, sealing with a filling sealant requires time for the sealant to harden, which significantly reduces work efficiency.

Second, when a defect in a device sealed with a sealant is discovered, it is usually difficult to remove the sealant and regenerate the device, and the sealed electrical equipment has to be discarded.

Third, when a device sealed with a sealant is used in a harsh temperature environment such as in an automobile, thermal stress is applied to the sealant due to the difference in thermal expansion coefficient between the sealant and the case and lid, resulting in long-term Needless to say, problems such as cracking and peeling of the sealing material may occur even during short-term use. In order to ensure the sealing function, it was necessary to prevent the lid from falling off from the case and to fix the lid with a locking part or a screw.

[Means for solving problems]

This invention addresses the problems of the conventional technology described above, and includes a box with a bottom, a base that is pressed against the opening of the box, and a seal that seals the joint between the box and the base. In the waterproof case, the sealing means includes a tongue piece whose tip portion deforms so as to come into contact with the joining surface when the box body and the base body are joined together, and an elastic member disposed at a corner. The present invention provides a waterproof case that is characterized in that it is disposed on at least one of the box body or the base body, and is intended to improve the efficiency of the assembly process and reduce the number of assembly steps.

[Effect]

When assembling the base body to the bottomed box, the tip of the tongue piece is brought into contact with the joint surface, and the tongue piece is deformed into a flexible state.

Further, an elastic member disposed at the corner is held between the bottomed box body and the base body, and is deformed under pressure, thereby performing a sealing action at the corner. In this way, the tongue piece and the elastic member work together to achieve waterproofing.

〔Example〕

The accompanying drawings illustrate preferred embodiments of the invention.

FIG. 1 is a sectional view of a main part showing a state in which a base body 2 is attached to a bottomed box body 1. Note that mechanical parts, electronic circuits, etc. housed in the box 1 are not shown and omitted.

FIG. 2 is a detailed cross-sectional view of the tongue piece 3 provided at the joint between the bottomed box body 1 and the base body 2 and integrally formed with the box body 1. FIG. Also, in the same figure, 4
5 is a hole into which the base body 2 is elastically fitted, and 5 is a tapered portion which guides the base body 2 during the elastic fit.

FIG. 3 is a perspective view of a rubber-like elastic member 6 disposed at a corner of the box 1. As shown in FIG.

FIG. 4 is a bottom view of the box 1 having the tongue piece 3 and the elastic member 6 disposed thereon. Further, in the figure, reference numeral 7 denotes a support portion for supporting the elastic member 6 at a corner, and is formed integrally with the box body 1. 8 is a fitting hole for an external connection connector.

The shape of the tongue piece 3 will be explained in detail.

The tongue piece 3 is formed almost all around the opening except for the corners of the box body 1 and the 8 fitting holes of the connector, and extends toward the center of the box body 1 as shown in FIG. It has a slightly inclined shape. For example, the first surface 3a has an angle α° of approximately 10° with respect to the side wall 1a of the box 1, and the second surface 3b has an angle β° of approximately 10°.
Tilt as 30°.

Therefore, when joining the box body 1 and the base body 2, the apex 3c formed by the first surface 3a and the second surface 3b of the tongue piece 3 first comes into contact with the surface of the base body 2, and then by further pressing. The second surface 3b of the tongue piece 3 slides and bends while being in contact with the surface of the base body 2.

Further, the angle θ° of the elastic member 6 shown in FIG. 3 is set to be slightly larger than the angle γ° formed by the corner of the box body 1, for example, about 5°. That is, γ=
When 90°, θ=95°. It has improved tightness in the corners.

The material constituting the base body 2 may be a metal plate, a ceramic plate, a printed circuit board, or a synthetic resin substrate, and the material of the box body 1 may be selected as appropriate. Also, tongue piece 3
may be formed integrally with the base body 2, and the elastic member 6 may also be provided on the base body 2.

Further, the fixing means for fixing the box body 1 and the base body 2 is not limited to the above-mentioned embodiment, by eliminating the hole 4 in which the base body 2 is elastically fitted.
For example, various means such as caulking or screwing may be used.

[Effect of idea]

In this invention, the sealing means of the waterproof case is composed of a tongue piece whose tip part deforms by contacting the joint surface when the bottomed box body and the base body are joined, and an elastic member disposed at the corner part. As a result, it is possible to improve the efficiency of assembling the waterproof case and reduce the number of assembly steps.Also, if a defect in the internal equipment is discovered after assembly, the box and base can be disassembled again. The box body and base body can be reused as they are because the deflection of the tongue piece returns to its original state.

Furthermore, since the sealing means has elasticity and forms a watertight structure, it has many effects such as being unaffected by thermal stress and the like.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a preferred embodiment of this invention. FIG. 2 is an enlarged detail of what is shown in FIG. FIG. 3 is a perspective view of an elastic member disposed at a corner of the bottomed box. FIG. 4 is a bottom view of a preferred embodiment of the waterproof case according to this invention. 1... Bottomed box body, 2... Base body, 3... Tongue piece, 6
...Elastic member.

Claims (1)

[Scope of utility model registration request] In a waterproof case comprising a box with a bottom, a base that is pressed against an opening of the box, and a sealing means for sealing a joint between the box and the base, the sealing means is configured to It is characterized in that it consists of a tongue piece whose tip part is deformed by contacting the joint surface when the base bodies are joined, and an elastic member disposed at the corner, and is disposed on at least one of the box body or the base body. Waterproof case.