Closure fasteners – Magnetic
Patent
1989-02-27
1990-04-10
Moore, Richard E.
Closure fasteners
Magnetic
292DIG53, 292DIG61, E05C 1756
Patent
active
049154311
ABSTRACT:
An electromagnetic lock including an armature and an electromagnet with the armature adapted for floating attachment to a door by a plunger-bolt assembly fixed to the door, and an electromagnet adapted for fixed attachment to a door frame. A door-movement alert switch structure comprising a pushbutton switch supported on the electromagnet, a plunger supported on the plunger-bolt assembly, and a spring force-biasing the plunger into mating contact with the switch when the door is electromagnetically locked to establish a first switch-actuation state. The force-biased spring maintains the switch in its first state while the armature is magnetically restrained. When the door is opened a door-movement distance slightly less than the armature float distance, the plunger is partially drawn into a plunger housing fixed on the plunger-bolt assembly. The switch responds by transferring to a second switch actuation state indicating an attempt to open the magnetically locked door.
REFERENCES:
patent: 2693382 (1954-11-01), Teetor
patent: 2864637 (1958-12-01), Teague et al.
patent: 4310188 (1982-01-01), Aoki
patent: 4720128 (1988-01-01), Logan, Jr. et al.
Douvas Augustus G.
Moore Richard E.
Rixson-Firemark Inc.
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