Electromagnetic door lock device

Closure fasteners – Magnetic

Patent

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Details

292144, E05C 1756

Patent

active

048262234

ABSTRACT:
The device includes an electromagnet, a bracket for holding the electromagnet in a door frame to force the opening therein, an electrical conduit for connecting the electromagnet to a power source, an armature magnetically attracted to the electromagnet when the latter is energized, a connector for holding the armature on a door edge in the frame for adjustable movement towards the electromagnet and a lock component for the device. The lock component comprises one or more ledges at the periphery of the electromagnet and/or armature pair projecting towards and engageable with the other(s) of the pair when the armature is magnetically attracted to the energized electromagnet. This occurs when the armature and electromagnetic are in line with each other, the armature being free to move toward the electromagnet. Unlocking is effected by deenergizing the electromagnet and allowing the armature to retract by gravity or spring action, so that the lock component also moves out of the descirbed engagement. The device is simple, durable and effective.

REFERENCES:
patent: 3350127 (1967-10-01), Hekelaar
patent: 3794366 (1974-02-01), Graham
patent: 4257631 (1981-03-01), Logan, Jr.
patent: 4401346 (1983-08-01), Jones et al.
patent: 4439808 (1984-03-01), Gillham
patent: 4487439 (1984-12-01), McFadden
patent: 4652028 (1987-03-01), Logan et al.

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