Electronic lock and key switch having key identifying function

Details Electronic lock and key switch having key identifying function Electronic lock and key switch having key identifying function

1987-02-25

1989-07-18

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825560, 70413, 70278, H04Q 100, H04Q 700, E05B 4700

Patent

active

048497495

ABSTRACT:
When a key is inserted into a key hole of a lock, magnetism creating means creates a magnetic flux corresponding to a predetermined magnetic code set in the key. Magnetism detecting means detects the magnetic flux and outputs a signal representing the detected magnetic flux. Decision means compares the signal value with a predetermined value, and outputs an agreement signal when the two values are the same. Driving means enables at least unlocking by key operation in response to the agreement signal. The magnetism detecting means outputs, as the above signal, a voltage corresponding to the magnitude of the detected magnetic flux or pulses having a frequency corresponding to same. At least one of material, dimensions, and thickness of the magnetic element determines the predetermined magnetic code. Further, an unlocking mechanism has a magnetic actuator which unlocks the lock by coupling the lock with unlocking means via a cam in response to the agreement signal.

REFERENCES:
patent: 3355631 (1967-11-01), Christiansen
patent: 3911252 (1975-10-01), Meyer
patent: 4177453 (1979-12-01), Collins
patent: 4257030 (1981-03-01), Bruhin et al.
patent: 4258352 (1981-03-01), Lipschutz
patent: 4392134 (1983-07-01), Lutz
patent: 4433355 (1984-02-01), Chew et al.
patent: 4665397 (1987-05-01), Pinnow
patent: 4712398 (1987-12-01), Clarkson et al.
patent: 4717816 (1988-01-01), Raymond et al.
patent: 4734693 (1988-03-01), Dluhosch et al.
patent: 4758835 (1988-07-01), Rathmann et al.

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