Safety locks

Details Safety locks Safety locks

1981-01-21

1982-07-20

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70278, H01H 4700

Patent

active

043409253

ABSTRACT:
The opening order of this safety lock causes the following operations to occur successively: application, to the key, of a coded sequence of angular solicitations in both directions, then the free rotation of this key in a given direction. The decoding is ensured electrically by comparing, with a previously memorized reference sequence, the train of electrical pulses generated by two electromechanical transducers actuated, according to the sequence applied to the key, by a cam itself driven by this key.

REFERENCES:
patent: 3749930 (1973-07-01), Roe
patent: 3889501 (1975-06-01), Fort
patent: 3941955 (1976-03-01), Gerber
patent: 4023161 (1977-05-01), Sasaki

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