Key-controlled electromagnetic operating mechanism for a lock an

Details Key-controlled electromagnetic operating mechanism for a lock an Key-controlled electromagnetic operating mechanism for a lock an

1979-12-14

1981-07-21

Yusko, Donald J.

Communications: electrical

Digital comparator systems

70413, 200 44, 361171, H04Q 300, E05B 4700, H01H 2700, G08B 1308

Patent

active

042801184

ABSTRACT:
An operating mechanism for a lock and the like is operated by means of a key on which permanent magnets may be secured in available magnet positions of a fixed pattern of such positions, selected positions being occupied by magnets. A reading device includes a reader body and a guide for guiding the key into a predetermined position in which respective sensors are contiguously adjacent each available magnet position and respond to the presence of a magnet in the adjacent position by generating an electrical signal. The several signals are compared with a reference signal, and an operating signal is generated by a comparator connected to the sensors and to the source of the reference signal when the sensor signals agree with the reference signal.

REFERENCES:
patent: 3512382 (1970-05-01), Check et al.
patent: 3744027 (1973-07-01), Vemura et al.
patent: 3854120 (1974-12-01), Matto et al.
patent: 3919869 (1975-11-01), Fromm

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