Electronic combination door lock with dead bolt sensing means

Details Electronic combination door lock with dead bolt sensing means Electronic combination door lock with dead bolt sensing means

1977-08-04

1979-04-03

Goldberg, Gerald

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

70149, 70153, E05B 4900

Patent

active

041480929

ABSTRACT:
The electronic combination door lock uses a push button keyboard in combination with a door provided with a dead bolt manually operable by an outer turning knob. The electronic circuitry for the keyboard compares an input code with a stored code and generates an enabling signal only if the input code is the same as the stored code. The outer turning knob is restrained from being manually moved to retract the dead bolt when the door is in its locked condition. This restraining of the outer knob is removed by the enabling signal which requires very little energy so that the dead bolt can then be manually retracted. Since the major portion of the work involved in unlocking the door is a manual operation, very little electrical energy is required for the keyboard and circuitry and a battery can thus be used to thereby eliminate complicated wiring to exterior power sources. Further major features of the invention include the ability to store several different combinations and to reprogram or change such combinations by means of the keyboard itself. The combination itself can comprise any number of digits within the capacity of memory storages in the electronic circuit.

REFERENCES:
patent: 1573802 (1926-02-01), Cadenel
patent: 3733861 (1973-05-01), Lester
patent: 3747377 (1973-01-01), Van Deudekom
patent: 3796889 (1974-03-01), Fradkin
patent: 3831065 (1974-08-01), Martin et al.
patent: 3845361 (1974-10-01), Watase et al.
patent: 4019355 (1977-04-01), Germanton
patent: 4038846 (1977-08-01), Klann
patent: 4062056 (1977-12-01), Goodrich

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