Spring unit for a keyboard

Details Spring unit for a keyboard Spring unit for a keyboard

1984-08-06

1986-02-18

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1376

Patent

active

045714665

ABSTRACT:
A spring unit for a keyboard comprises a base sheet having a specified number of openings perforated thereupon in accordance with a key layout and a number of dome-shaped spring members separated individually from each other, and each bearing a movable contact point for completing a circuit between fixed contact points. Each of the spring members is removably engaged with an opening in the base sheet. The spring members are molded from a high polymer resilient material and are easily replaceable.

REFERENCES:
patent: 3489342 (1970-01-01), Anderson
patent: 3879586 (1975-04-01), DuRocher et al.
patent: 3930083 (1975-12-01), Pinkham
patent: 4032729 (1977-06-01), Koistinen
patent: 4366355 (1982-12-01), Oelsch
patent: 4408103 (1983-10-01), Smith, III
patent: 4441001 (1984-04-01), Miyano et al.
Johnson, D. O. Jr.; IBM Technical Disclosure Bulletin; "Keyboard with Changeable Encoding and Key Designation"; vol. 13, No. 7, Dec. 1970, pp. 2041, 2042.

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