Magnetic door lock with time delay option

Details Magnetic door lock with time delay option Magnetic door lock with time delay option

1986-05-08

1987-11-03

Moore, Richard E.

Closure fasteners

Magnetic

292DIG65, E05C 1756

Patent

active

047039620

ABSTRACT:
A magnetic door lock with a time delay option includes an electromagnet mounted on a door frame and an armature mounted on a door. The electromagnet has a pair of laterally spaced slots therein which each have a reed switch therein for monitoring magnetic flux in the electromagnet. When the armature is engaged with the electromagnet, the magnetic flux is at a selected level sufficient to close the reed switches. If, due to tampering or some other reason, the magnetic flux drop does not reach the selected level, at least one of the reed switches will remain open indicating that the armature is not securely engaged with the electromagnet. The door lock also includes separate mounting plates for mounting the electromagnet and armature so that the electromagnet and armature will be properly aligned when mounted. A plunger is provided adjacent the electromagnet for engagement by a block adjacent the armature. When an attempt is made to open the door, the plunger moves thereby sensing the attempt. The plunger negates the need for an electric hinge for carrying current across the gap between the door and door jamb.

REFERENCES:
patent: 3204154 (1965-08-01), Crandell
patent: 3426166 (1969-02-01), Canceill
patent: 3438051 (1969-04-01), DeVines
patent: 4257631 (1981-03-01), Logan, Jr.
patent: 4287512 (1981-09-01), Combs
patent: 4314722 (1982-02-01), Logan, Jr.
patent: 4324425 (1982-04-01), Logan
patent: 4328985 (1982-05-01), Logan
patent: 4351552 (1982-09-01), VanDerLinden
patent: 4354699 (1982-10-01), Logan
patent: 4470625 (1984-09-01), Walsh et al.
patent: 4487439 (1984-12-01), McFadden
patent: 4516114 (1985-05-01), Cook
patent: 4540208 (1985-10-01), Logan, Jr. et al.
patent: 4609910 (1986-09-01), Geringer et al.

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