Electronic door lock

Details Electronic door lock Electronic door lock

1975-10-20

1977-03-22

Envall, Jr., R. N.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70278, E05B 4702

Patent

active

040139301

ABSTRACT:
An electronic door lock has a lockbolt operable between locked and unlocked positions by an electrically energizable bolt mover which is responsive to an electronic locking circuit and an electronic unlocking circuit. A switch actuates the electronic unlocking when the door is to be opened. A control circuit, also responsive to the switch, generates a control signal which is time-delayed by at least a predetermined interval after the actuation of the unlocking circuit. The locking circuit responds to the control signal by energizing the bolt mover so as to move the lockbolt to the locked position, thereby causing the door to be automatically locked after at least the predetermined interval following the unlocking of the door.

REFERENCES:
patent: 3831065 (1974-08-01), Martin
patent: 3877266 (1975-04-01), McLaughlin

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