Device for contact between a case bottom and cover of a closed h

Details Device for contact between a case bottom and cover of a closed h Device for contact between a case bottom and cover of a closed h

1993-09-13

1995-03-21

Moy, Joseph Man-Fu

Receptacles

Sectional

Electrical housing

220 421, 220 428, B65D 600

Patent

active

053988337

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a device for contact between the case bottom and cover of a closed housing in which the cover can be pushed and/or slipped over the case bottom.
2. Description of the Related Art
In electronic equipment, in particular as used in telecommunications engineering and data engineering, the housing for the equipment is to be configured with respect to effective screening (EMC) and radio interference suppression in such a way that the influence of external interference remains as slight as possible. In the case of multipart housings which are assembled integrally, the boundaries between units therefore requires special measures, such as overlaps, labyrinths, spring contacts or complicated screwed joints.
Two-part housings consisting of a case bottom and cover therefore offer substantial advantages. In this case, the case bottom serves as a chassis in which the equipment components are installed. The cover is slipped and/or pushed over the case bottom. The interior of the case is therefore adequately shielded from interfering radiation without interruption. However, this applies only if a reliable electrical contact can be established between the case bottom and cover. This is particularly difficult, however, because possible contact regions are no longer accessible or are accessible only with difficulty when the housing is closed.


SUMMARY OF THE INVENTION

It is the object of an present invention to provide a contacting device for contacting the case bottom and cover of a closed housing, in which the cover can be pushed and/or slipped over the case bottom in such a way that a simple and yet reliable contact between the case bottom and cover is possible even at points that are difficult to access.
This and other objects is achieved according to the invention by both the case bottom and the cover each have the form of a cuboid that is open at least towards one side and are each produced in one piece from sheet metal, there are arranged on the insides of two mutually opposite side walls of the cover rails whose U-shaped profile contains a spring receiving surface approximately at right angles to the side wall, a supporting surface joined to the wall is opposite this spring receiving surface, which supporting surface is embraced by the open limbs of the rails, and contact springs are captively arranged between the spring receiving surface and supporting surface.
Advantageous developments and embodiments of the invention are provided when the spring receiving surface is parallel to the surface of the outside of the cover. Further, there are provided on the edges of the case bottom against which the cover bears when the housing is closed lug-like projections which are aligned such that they are parallel to the surface of the cover bearing against them. In one embodiment, strip contact springs are arranged between the surfaces, directed towards the cover, of the lug-like projections and the cover.
A preferred arrangement provides that the lug-like projections and the supporting surfaces of the case bottom are formed by bending the sheet metal.


BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the invention is explained in more detail below with the aid of the drawings, wherein
FIG. 1 shows a housing consisting of a case bottom and cover with a plurality of contacting devices, in a perspective, exploded representation,
FIG. 2 shows a sectional representation through the spring receiving surface of a rail with a sheet-metal strip spring clamped in place, and,
FIG. 3 shows a transverse section through the rail with the cover placed on the case bottom.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows the perspective exploded representation of a closed cuboid housing. The housing, which is viewed from the rear, comprises a case bottom 2 and a cover 1. Both the case bottom 2 and cover 1 are each produced in one piece from a metal sheet. The case bottom 2 comprises an underside, a front side and a rear side of the c

REFERENCES:
patent: 2731555 (1956-01-01), Beck
patent: 4899900 (1990-02-01), Debus et al.
patent: 4953734 (1990-09-01), Stohr
patent: 5111362 (1992-05-01), Flamm et al.
patent: 5207342 (1993-05-01), Tsuji et al.
patent: 5280132 (1994-01-01), Clarey et al.

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