Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1976-09-21
1977-12-27
Scott, James R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200 5A, 235145R, 340365R, H01H 1370
Patent
active
040656500
ABSTRACT:
In a hand-operated electronic calculator, a switchboard having push-button switches for digits and symbols, every two or more switches combined into V, or U, or square shaped groups either above the surface or recessed for receiving fingertips and actuated along two or more directions. Switch groups are arranged at finger locations, each group of switches being assigned to a certain finger, two or more groups to active fingers, and a group can be at a perpendicular direction to the other four fingers for thumb operating.
REFERENCES:
patent: 1823809 (1931-09-01), Varner et al.
patent: 3319884 (1967-05-01), Franklin
patent: 3428747 (1969-02-01), Alferieff
patent: 3684842 (1972-08-01), Boulanger
patent: 3700836 (1972-10-01), Rackson
patent: 3728509 (1973-04-01), Shimojo
patent: 3950634 (1976-04-01), Speiser
R. Seibel et al.; "Keyboard", IBM Tech. Disc. Bull; vol. 3; No. 6; Nov. 1960; p. 16.
D. Conway; "Digital "X" Typewriter Keyboard"; IBM Tech. Disc. Bull.; vol. 18; No. 12; May 1976; pp. 4187-4190.
D.C. Kowalski; "Semi-Captive Keyboard"; Xerox Disclosure Journal; vol. 1; No. 2; Feb. 1976; p. 85.
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