JPH02123796A - Electrical equipment - Google Patents

Abstract

PURPOSE:To facilitate assembly, and to decrease defectives by movably fitting housing members, either one of which is made of a shape memory synthetic resin, to each fitting edge section and heating the housing members. CONSTITUTION:A base 1 is composed of a normal synthetic resin material, and has terminals 5. A case 2 is formed in a box body made up of a shape memory synthetic resin material, the box shape of approximately a U-shaped cross section is stored while the opening edge section 2a of the case 2 is forcibly pushed open to the outside and deformed, and an opening area is made slightly larger than the floor area of the base 1. When the opening edge section 2a of the case 2 is fitted to the fitting edge section 1a of the base 1 into which a relay body 4 is incorporated and heated from the outside, the opening edge section 2a of the case 2 is recovered to an original shape and pressure-welded to the fitting edge section 1a of the base 1, and a housing 3 is sealed. Accordingly, assembly operation is facilitated, and yield is improved.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electrical equipment.

(Prior Art and Problems to be Solved by the Invention) Conventionally, for electrical equipment, for example, in order to protect the internal components arranged in the housing from dust, etc., the case is press-fitted into the base and the mating edges of the two are It is widely known that the inside of the housing is sealed.

However, since this was a press-fitting method, it took time and effort to position and assemble the base and the case.

On the other hand, in order to ensure a high degree of airtightness that prevents the intrusion of cleaning fluids, electrical equipment is widely known in which a case is fitted to a base, and a sealing material is injected into the joint between the two and solidified to completely seal the case.

However, with this method, the gas inside the housing expands and pushes up the case before the sealing material solidifies, and the sealing material solidifies in that state, so the height of the final product tends to be out of specification, resulting in poor yield. There was a problem.

In view of the above-mentioned problems, an object of the present invention is to provide an electrical device that is easy to assemble and has fewer defective products.

(Means for Solving the Problems) In order to achieve the above object, the electrical equipment according to the present invention has the following features:
In an electrical device in which internal components are arranged in a housing formed by fitting a case to a base, at least one of the housing members of the base and the case forming the housing is made of a shape memory synthetic resin; The mating edge of the one housing member and the other housing have recovered their original shapes by forcibly deforming the mating edge, loosely fitting it into the mating edge of the other housing member, and heating it. It has a structure in which the fitting edge of the member is integrated by pressure contact.

(Function) Therefore, according to the present invention, by loosely fitting the case to the base and heating it, the base or the case constituting the housing recovers to its original shape with shape memory, and the fitted edge of the base and the fitting edge of the case come into pressure contact with each other.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings of FIGS. 1 to 3.

This embodiment is applied to a relay, and a relay main body 4 (
(shown by the two-dot chain line).

The base l is made of an ordinary synthetic resin material and has terminals 5.

On the other hand, case 2 is a box made of shape memory synthetic resin material.
By memorizing the box shape of the cross-sectional path 9 (Fig. 1) and forcing the opening edge 2a outward to deform it, the opening area is larger than the floor area of the base l. is also slightly larger.

After fitting the opening edge 2a of the case 2 to the fitting edge 1a of the base 1 on which the relay main body 4 is assembled (Fig. 2)
By heating from the outside, the opening edge 2a of the case 2 recovers to its original shape and comes into pressure contact with the fitting edge [a] of the base l, thereby sealing the housing 3.

Next, the joint between the opening edge 2a of the case 2 and the fitting edge 2a of the base l and the attachment of the terminal 5 are completed by injecting a sealing material 6 into the base and solidifying it. Note that when heating the case 2, for example, heat from preliminary solder may be used.

According to this embodiment, since the opening edge 2a of the case 2 is pushed outward and the opening area is increased, the assembly of the positioning 2 becomes easier and automatic assembly becomes easier.

Moreover, before the sealing material 6 solidifies, the inside of the housing 3
Even if the gas expands, the fitting edge 1a of the base l and the opening edge 2a of the case 2 are integrally pressed together, so the case 2 will not lift up from the base 1, and the external dimensions will not exceed the standard. The advantage is that it does not.

Although this example describes the case where the sealant is injected and solidified, it is not always necessary to seal with the sealant, and the integration of the base and case and the sealing work with the sealant can be performed at the same time. good.

Further, in the above-mentioned embodiments, the base is a plate-shaped body made of an ordinary synthetic resin material, but the base may be made of a shape-memory synthetic resin material, or may be box-shaped.

Moreover, it goes without saying that the electrical equipment to which the present invention is applied is not limited to relays, but may be other electrical equipment such as switches.

(Effects of the Invention) As is clear from the above description, according to the present invention, when one housing member is assembled to the other housing member, the fitting is in a so-called loose fit state, so that the assembly is a labor-intensive process. becomes easier.

Furthermore, due to heating after the housing members are fitted, the fitting edge of one housing member, which has recovered its original shape, is pressed and integrated with the fitting edge of the other housing, so that the injected sealing material solidifies. Even if the gas inside the housing expands before it is removed, the case will not lift up from the base and will not shift.

Therefore, the external dimensions of the final product will not be out of specification, and the yield will be improved.

[Brief explanation of drawings]

1 to 3 show an embodiment of the electrical device according to the present invention, in which FIG. 1 is a sectional view of the case, FIG. 2 is a sectional view showing the case fitted to the base, and FIG. 3 is a sectional view of the case. FIG. 2 is a sectional view showing a state in which a sealing material is injected and solidified to be sealed. DESCRIPTION OF SYMBOLS 1... Base, la... Fitting edge, 2... Case, 2a... Opening edge (fitting edge), 3... Housing, 4... Internal components.

Claims (1)

[Claims] (1) In an electrical device in which internal components are arranged within a housing formed by fitting a case to a base, at least one of the housing members of the base and the case forming the housing is made of shape memory synthetic resin. and the fitting edge of the one housing member which has recovered its original shape by forcibly deforming the fitting edge, loosely fitting it into the fitting edge of the other housing member, and heating it. An electrical device characterized in that the fitting edge of the other housing member is integrated by pressure welding.