Fail safe system for a mechanical lock and key set with electric

Details Fail safe system for a mechanical lock and key set with electric Fail safe system for a mechanical lock and key set with electric

1992-09-15

1994-02-15

O'Shea, Sandra L.

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 70278, 70237, 235492, H04Q 100

Patent

active

052870987

ABSTRACT:
A mechanical key and lock set with a rotating cylinder includes an electronic interlock which is responsive to the insertion of a mated key in the cylinder and proper rotation of the cylinder. A sensor is placed in communication with the cylinder and senses proper rotation of the cylinder to generate an activation signal. Systems controlled by the lock cannot be enabled without the generation of the activation signal. Fail safe blocking circuitry is placed in communication with the activation signal generator and in the event the actuation signal is attempted to be read in an unauthorized manner without properly rotating the cylinder, the blocking circuitry is functional to preclude reading.

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"Microelectronic Circuit" Sedra and Smith p. 432 1982.

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