Keyboard assembly momentary contact push button switch with tact

Details Keyboard assembly momentary contact push button switch with tact Keyboard assembly momentary contact push button switch with tact

1976-01-19

1977-11-01

Scott, James R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 200 67DB, 200 76, 200159A, 200243, 200275, 200340, H01H 1352

Patent

active

040567001

ABSTRACT:
A contact switch for momentary connection between conductors is disclosed. The switch has particular utility in a keyboard assembly, such as pocket calculators. In the first embodiment, the switch comprises a button member, and a sinusoidal-shaped spring. The spring is of a configuration such that reaction of the spring is stronger in its normal position than in its depressed state. This provides the user with a tactile feeling when the button is depressed. In the second embodiment, the button member is retained in an extended position by an associated buckle spring. This spring also provides the user with a tactile feeling.

REFERENCES:
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patent: 1006394 (1911-10-01), Morrell
patent: 2424527 (1947-07-01), Whyte et al.
patent: 2755352 (1956-07-01), Birkemeier
patent: 2923787 (1960-02-01), Nelson
patent: 3544987 (1970-12-01), McMann et al.
patent: 3808389 (1974-04-01), Ramsay et al.
patent: 3818170 (1974-06-01), Seidel
patent: 3849611 (1974-11-01), Walker, Jr.
patent: 3899648 (1975-08-01), Murata
patent: 3922513 (1975-11-01), Kravchuck
patent: 3959611 (1976-05-01), Greene et al.
patent: 3997745 (1976-12-01), Marquardt
patent: 4004121 (1977-01-01), Twyford

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