Keyhole-less electronic lock

Details Keyhole-less electronic lock Keyhole-less electronic lock

1975-12-29

1977-06-21

Envall, Jr., R. N.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70277, E05B 4700

Patent

active

040314340

ABSTRACT:
An inductively coupled electronic lock system wherein a key unit receives binary multiple bit data and generates a binary frequency modulated carrier which is input to a transmitter inductor. A lock unit of the system has an inductive pick-up which compares the received sequence of binary signals with a predetermined sequence of binary signals so that upon a proper correspondence a motor opens the lock.

REFERENCES:
patent: 3885408 (1975-05-01), Clark, Jr.
patent: 3953769 (1976-04-01), Sopko

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