Dual sensor electromagnetic door lock system

Details Dual sensor electromagnetic door lock system Dual sensor electromagnetic door lock system

1989-01-17

1990-01-16

Smith, Gary L.

Closure fasteners

Magnetic

49 25, 367 93, 250342, 292 92, E05C 1756

Patent

active

048938521

ABSTRACT:
An electromagnetic lock which mounts at the top of a door frame and magnetically bonds with an armature employs both an ultrasonic sensor and a passive infrared sensor to detect the approach of an individual at the doorway. Both the ultrasonic sensor and the passive infrared detector have fan-shaped sensing regions which are positioned forwardly from the doorway. Upon detection of an individual approaching the doorway, the lock is capable of automatically releasing to allow egress through the doorway.

REFERENCES:
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patent: 4155066 (1979-05-01), Galvin et al.
patent: 4551826 (1985-11-01), Kritz
patent: 4591864 (1986-05-01), Sternberg et al.
patent: 4697383 (1987-10-01), Hagiwara
patent: 4720128 (1988-01-01), Logan, Jr. et al.
patent: 4763937 (1988-08-01), Sittnick, Jr. et al.
patent: 4800368 (1989-01-01), Wisner
patent: 4822085 (1989-04-01), Guity-Mehr

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