Card key switch

Details Card key switch Card key switch

1983-01-26

1984-12-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70277, 361175, E05B 4900

Patent

active

044893590

ABSTRACT:
A card key switch including a card key obtained by forming notches, in accordance with a key code, on opposite side edges of a card or a card casing for accommodating the card, a key cylinder formed with a key slot, a plurality of tumblers, a light emitting element and a photo detector operatively associated with the light emitting element so as to generate an electric signal in response to detection of light from the light emitting element.

REFERENCES:
patent: 3550410 (1970-12-01), Toepfer
patent: 3749930 (1973-07-01), Roe
patent: 3764859 (1973-10-01), Wood et al.
patent: 3781805 (1973-12-01), O'Neal, Jr.
patent: 3863115 (1975-01-01), Hasenbein

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