Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1975-12-09
1977-09-27
Frazier, Roy D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
70278, 70280, H01H 4700
Patent
active
040515486
ABSTRACT:
An electric locking device comprising a plurality of manipulative control switches, a presetting mechanism having a plurality of variable connecting mechanisms capable of selectively varying and presetting connected states with respect to the manipulative control switches, a relay circuit including a plurality of relays respectively connected to the variable connecting mechanisms and being successively supplied with electric power when the manipulative control switches to which the variable connecting mechanisms are selectively connected are closed in a specific sequence, the relays being so connected that, as a result of energization of one relay, a relay switch of that one relay closes, whereby the succeeding relay in the specific sequence assumes an energizable state, and, at the same time, the relay switch assumes a lock-up state, and a circuit operated by the energization of the final relay in the specific sequence of the relay of the relay circuit to cause a locking mechanism to perform an unlocking operation.
REFERENCES:
patent: 1283845 (1918-11-01), Marchant
patent: 2436809 (1948-03-01), Joel
patent: 3266278 (1966-08-01), Ennitt
patent: 3513357 (1970-05-01), Dittmore
patent: 3562596 (1971-02-01), Scheuer
patent: 3854310 (1974-12-01), Paull et al.
patent: 3893723 (1975-07-01), Boule
patent: 3933382 (1976-01-01), Counts et al.
Bonck Rodney H.
Frazier Roy D.
Murata Tokao
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