Closure fasteners – Magnetic
Patent
1989-04-19
1990-09-18
Nicholson, Eric K.
Closure fasteners
Magnetic
292DIG64, 292DIG60, E05C 1756
Patent
active
049573160
ABSTRACT:
An electromagnetic surface lock comprising an electromagnetic adapted to be mounted to a door frame and an armature adapted to be mounted to a door and attracted to the electromagnet and lock the door in the frame, said armature comprising first and second plates of magnetic flux permeable material, the plates being secured together in surface contact, a device for mounting said armature to a door and having headed portion with a socket therein and, having a shank portion adapted to be received in and secured to the door, a recess is defined in the first of the plates, and receives the headed portion, the second plate has an opening therein for receiving the shank portion whereby the headed portion is captured between the plates, and a small passage is defined through the first plate to the socket in the headed portion for receiving a turning tool whereby the headed device may secure the armature to the door, the second plate greatly increasing the rigidity of the armature.
REFERENCES:
patent: 3533652 (1970-10-01), Crane et al.
patent: 3781047 (1973-12-01), Surko, Jr.
patent: 3913958 (1975-10-01), Larime
patent: 4049302 (1977-10-01), Andersson et al.
patent: 4439808 (1984-03-01), Gillham
patent: 4652028 (1987-03-01), Logan et al.
patent: 4696500 (1987-09-01), Zunkel
patent: 4703962 (1987-11-01), Kelly et al.
patent: 4861080 (1989-08-01), Frolov
Harrow Products Inc.
Nicholson Eric K.
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