Keyboard switch assembly having raised contacts supported by hel

Details Keyboard switch assembly having raised contacts supported by hel Keyboard switch assembly having raised contacts supported by hel

1974-09-23

1976-09-07

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 67DB, 200159B, 200275, 200292, H01H 1326, H01H 106

Patent

active

039795683

ABSTRACT:
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 support legs that are also an integral part of the support substrate. The support legs extend radially outward from the movable contact and contact the substrate and the movable contact at equally spaced points. The movable contact is aligned with either a stationary contact or another movable contact and a stationary contact to provide either single or multiple switching. The switching device can be used for contact switching or capacitive switching. A plurality of the switching devices can be formed on the support substrate making the switching device particularly well suited for use in a keyboard. A portion of each support leg may be thinned to provide a negative force-displacement characteristic which provides a good tactile feedback signal indicating switching.
One or more of the switching devices are produced by forming one or more groups of curved, unconnected, radially extending slots in a metallic substrate, deforming the legs defined by the slots past their elastic limit, and then, if desired, precipitation hardening the completed structure. To assure movement of the central area of the movable contact past the plane of the support substrate, a portion of each of the legs is thinned prior to the legs being plastically deformed.

REFERENCES:
patent: 3133170 (1964-05-01), Nanninga
patent: 3331040 (1967-07-01), Woodhead
patent: 3600528 (1971-08-01), Leposavic
patent: 3742157 (1973-06-01), Leposavic
patent: 3800104 (1974-03-01), Lien et al.
patent: 3831118 (1974-08-01), Bitko
patent: 3842230 (1974-10-01), Kashio et al.
IBM Technical Disclosure Bulletin, H. L. Funk et al, "Keyboard Encoder," vol. 7, No. 11, Apr. 1965, pp. 1018, 1019.

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