Security system and lock

Details Security system and lock Security system and lock

1986-08-14

1989-04-11

Pascall, M. H.

Registers

Coded record sensors

Particular sensor structure

235435, 235441, G06K 700

Patent

active

048209104

ABSTRACT:
A code system comprising a temperature-resistance conversion element the change of electric resistance value of which describes a hysteresis loop with respect to a temperature change; a means for changing the temperature of said temperature-resistance conversion element; a means for detecting the change of the electric resistance of said conversion element; and a time counting means of counting the actuation time of said temperature changing means. A hard lock device for use in the code system is also disclosed.

REFERENCES:
patent: 3900716 (1975-08-01), Kawabata et al.
patent: 3935431 (1976-01-01), Scheffel
patent: 4058705 (1977-11-01), Cannon
patent: 4079360 (1978-03-01), Ookvbo et al.
patent: 4104515 (1978-08-01), Thornburg et al.
patent: 4582985 (1986-04-01), Lofbers

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