Method of forming a deformed, integral switching device

Details Method of forming a deformed, integral switching device Method of forming a deformed, integral switching device

1974-09-23

1976-04-20

Lanham, C. W.

Metal working

Method of mechanical manufacture

Electrical device making

29622, 29630B, 200 5A, 200159B, H01R 900

Patent

active

039508463

ABSTRACT:
A method of forming a switching device having a movable contact that is an integral part of a metallic support substrate and is supported above the support substrate by a plurality of spring-like legs that are also an integral part of the support substrate. One or more of the switching devices is produced by forming one or more groups of curved, unconnected radially extending slots in a metallic substrate to define support legs, plastically deforming the legs defined by the slots past their elastic limit, and then precipitation hardening the complete structure. The slots can be formed by a photomasking technique followed by an acid etch with the etch being performed from both sides of the metallic support substrate. To provide a desired tactile response characteristic, and to assure movement of a central portion of the switching device past the plane of the metallic support substrate, a portion of each of the legs defined by the slots may be removed to thin that portion of each leg. The plastic deformation may be performed in a male-female die mechanism.

REFERENCES:
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patent: 3582596 (1971-06-01), Woodhead
patent: 3600528 (1971-08-01), Leposavic
patent: 3643041 (1972-02-01), Jackson
patent: 3697711 (1972-10-01), Tetrick
Metals Handbook, 8th Ed., Vol. 2, Heat Treating, Cleaning and Finishing, pp. 284-292.

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