Electromagnetic door lock device

Details Electromagnetic door lock device Electromagnetic door lock device

1990-04-16

1991-01-22

Moore, Richard E.

Closure fasteners

Magnetic

292DIG72, 292144, E05C 1756

Patent

active

049865811

ABSTRACT:
An improvement in an electromagnetic door device. The door device includes an electromagnet secured in a housing to the underside of the top of a door frame, a door hinged in the frame for opening and closing therein, and an armature secured to the top of the door for movement betrween a resting position on the door top and an operative position upwardly magnetically attracted to the electromagnet when the latter is energized. In the operative position, the armature is intercepted by a locking plate depending from the housing, so as to lock the door until the electromagnet is deenergized and the armature drops away to the resting position. The improvement is a device which biases the armature upwardly so that it is, in effect, lighter, requiring less electromagnetic force to attract it and permitting the armature to be spaced, in the resting position, a greater distance therefrom for improved door-frame clearance. The biasing device may be one or more leaf or coil springs, elastomeric cushions or plugs or mutually repelling permanent magnets disposed between the adjacent surfaces of the armature and door top. The armature can also be honeycombed to reduce its weight.

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