Electromagnetic door lock

Details Electromagnetic door lock Electromagnetic door lock

1992-10-05

1993-11-16

Moore, Richard E.

Closure fasteners

Magnetic

292DIG64, E05C 1916

Patent

active

052617130

ABSTRACT:
An electromagnetic door lock comprises in combination a convex armature plate and oblong magnet whereby the plate is flattened into full contact with the magnet when energized. De-energizing the magnet allows the plate to spring back to the convex shape and elastic means to instantly separate the armature from the magnet. One or more reed switches are located in cavities in the support bracket for the magnet. The reed switches are positioned to sense a substantial change in the leakage flux caused by an "air gap" between the armature and the magnet and thereby infer full locking or unlocking of the door lock.

REFERENCES:
patent: 3931551 (1976-06-01), Holt
patent: 4257631 (1981-03-01), Logan
patent: 4318155 (1982-03-01), Thomas
patent: 4439808 (1984-03-01), Gilliham
patent: 4516114 (1985-05-01), Cook
patent: 4682801 (1987-07-01), Cook
patent: 4840411 (1989-06-01), Sowersby
patent: 4957316 (1990-09-01), Frolov
patent: 5016929 (1991-05-01), Frolov
Securitron-Magnalock Advertisement Access Control Magazine Jan. 1990.

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