Electromagnetic door lock system

Details Electromagnetic door lock system Electromagnetic door lock system

1986-09-11

1988-08-16

Gall, Lloyd A.

Closure fasteners

Magnetic

49 25, 49 31, 70277, 292 92, 340542, 361170, E05C 1756

Patent

active

047639377

ABSTRACT:
An electromagnetic door lock system employs an electromagnetic lock which magnetically bonds with an armature plate. An acoustical sensor generates a detection beam. The detection beam is directed toward the doorknob. Reflected energy is received and electronically processed to detect the presence of a foreign object in the vicinity of the doorknob. The lock automatically deactuates when a foreign object is detected in the vicinity of the knob. The electromagnetic lock, sensor and processing circuitry are mounted in a housing which is located near the top of a doorway. An audio alarm and status light indicators are mounted at the housing to indicate the status of the lock.

REFERENCES:
patent: 2601775 (1952-07-01), Jewett et al.
patent: 3126218 (1964-03-01), Andrews
patent: 4034437 (1977-07-01), Robertson et al.
patent: 4080594 (1978-03-01), Plevy
patent: 4123748 (1978-10-01), Otani
patent: 4257631 (1981-03-01), Logan
patent: 4639902 (1987-01-01), Leverance et al.
patent: 4652028 (1987-03-01), Logan et al.
patent: 4652862 (1987-03-01), Verslycken

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