Low profile keyboard switch having panel hinged actuators and ca

Details Low profile keyboard switch having panel hinged actuators and ca Low profile keyboard switch having panel hinged actuators and ca

1973-12-21

1977-06-28

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

197 98, 200 1R, 200 5R, 200 67DA, 200159A, 200275, 200340, 235145R, H01H 1326, R41J 500, G06C 702

Patent

active

040327299

ABSTRACT:
A low profile keyboard switch with tactile feel and short key travel is disclosed. The keyboard may be a matrix connected keyboard and includes a lower, fixed contact and an upper, concave contact. The concave contact is supported at one end and operates as a cantilever beam. When pressure is applied by a key, at the unsupported end to cause buckling of the concave contact at its supported end, electrical contact is made with the lower fixed contact. The concave contacts possess the key return force and the snap action desirable for tactile feel and short key travel for a low-profile, low-cost keyboard switch.

REFERENCES:
patent: 3080115 (1963-03-01), Buchholz
patent: 3205754 (1965-09-01), Becwar
patent: 3290439 (1966-12-01), Willcox et al.
patent: 3388226 (1968-06-01), Willcox
patent: 3489342 (1970-01-01), Anderson
patent: 3548131 (1970-12-01), Piber
patent: 3627935 (1971-12-01), Spievak
patent: 3707609 (1972-12-01), Dupot et al.
patent: 3743797 (1973-07-01), Hoffman
patent: 3786205 (1974-01-01), Lien
patent: 3797357 (1974-03-01), Thomas et al.
patent: 3800104 (1974-03-01), Lien et al.
IBM Technical Disclosure Bulletin, R. G. Cross, "Keyboard Overlay", vol. 15; No. 1; June, 1972; p. 31.

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