Electrical device, particularly switching and control device for

Details Electrical device, particularly switching and control device for Electrical device, particularly switching and control device for

1994-11-02

1996-07-09

Picard, Leo P.

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

361736, 361796, 361801, 174 50, H05K 500

Patent

active

055350984

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on an electrical device, particularly a switching and control device for motor vehicles, of the generic type of the main claim. Such an electrical device is known, for example, from DE 92 00 624 U1, not previously published. Such devices are of very simple construction with respect to their mechanical structure and can therefore be inexpensively produced. The electrical device essentially consists of three main components, a printed circuit board assembly (with connector strip), a housing bottom and a housing cover. The housing bottom and the housing cover in each case have a continuous collar-like edge. The housing bottom and the housing cover rest with these edges against the underside and, respectively, top side of the circuit board in the area of its outer edge. As a result, the circuit board is clamped and fixed in location between the housing bottom and housing cover. To obtain a fixed and reliable connection between the two housing parts and to secure the circuit board in position, these three components are permanently connected to one another in the area of the collar-like edges of the housing parts. This connection can be effected inexpensively and by simple production means by flanging. Such a housing configuration has the disadvantage that a considerable amount of unusable areas are used on the circuit board for supporting the housing parts and their interconnection. The total area of the circuit board is therefore relatively large in comparison with the inner area of the circuit board available for fitting and accommodating circuit components. Since no circuit elements can be arranged in the support areas for the housing parts, such an electrical device requires a relatively large base area compared with the circuit-carrying, that is to say equipped area of the circuit board.


ADVANTAGES OF THE INVENTION

By comparison, the electrical device, particularly switching and control device for motor vehicles according to the invention, having the characterizing features of the main claim, has the advantage that a simple inexpensive housing configuration is made possible, the base area of the electrical device taken up being only slightly larger than the equipped area of the circuit board. The unusable zones on the circuit board which are required for mounting the circuit board in the interior of the housing are minimal. The housing dimensions and the dimensions of the electrical device at the level of the circuit board are only slightly larger than the circuit board area required for equipping and accommodating the circuit.
By constructing one or more housing parts as stamped sheet metal parts or as deep-drawn stamped sheet metal parts, an inexpensive component production which is simple in terms of production engineering is possible.
An inexpensive production or a simple production process which manages without additional mounting parts is obtained especially when the housing parts are connected to one another into the circuit board by means of flanging.
Constructed sections at the housing parts which extend parallel to the circuit board surfaces advantageously result in support areas for the circuit board by means of which a spacing from the remaining housing surfaces is ensured. Thus, no additional spacing elements or fixing elements are required inside the housing. These support areas can be used simultaneously for mounting. It is possible to form these sections either during a machine mounting and flanging process or to preshape these sections directly or in an intermediate step during the shaping of the housing parts.
It is particularly advantageous if the sections of the housing parts which extend parallel to the surface of the circuit board point into the interior of the housing for supporting and mounting the circuit board. This ensures that the outside dimensions of the electrical device are only slightly larger than the corresponding dimensions of the circuit board in the area of the flat circuit board extent. The side walls of the housing can thus exten

REFERENCES:
patent: 4668873 (1987-05-01), Ohba et al.
patent: 5268820 (1993-12-01), Tseng et al.

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