Keyboard switch

Details Keyboard switch Keyboard switch

1975-01-27

1977-04-05

Schaefer, Robert K.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200159A, H01H 900

Patent

active

040163881

ABSTRACT:
A pushbutton switch has a base and a button telescopically movable on the base. There are a pair of terminals, with one of the terminals having a contact arm positioned within a switching chamber in the base. Movement of the button is effective to cause the contact arm to close upon the other terminal. The effective length of the contact arm is greater than its actual length. In one improvement, a light emitting device may be illuminated when the switch is operated. In another, a portion of the light emitting device forms the means to close the contact arm.

REFERENCES:
patent: 2420066 (1947-05-01), Conway
patent: 2673914 (1954-03-01), Sundt
patent: 3610860 (1971-10-01), Baldwin
patent: 3632938 (1972-01-01), Stessel
patent: 3749872 (1973-07-01), Foster
patent: 3916131 (1975-10-01), Goldbeck et al.
Liebert, P-n junctions as radiation sources, Electronics, vol. 37, No. 20, July 13, 1964, p. 61.

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