Closure fasteners – Magnetic
Patent
1990-04-30
1991-07-23
Moore, Richard E.
Closure fasteners
Magnetic
292DIG72, E05C 1756
Patent
active
050337793
ABSTRACT:
An improvement is provided in an electromagnetic door lock device. The device itself includes an electromagnet in a housing adapted to be connected to the top of a door frame and depend from the underside thereof above a door in the frame. The device also includes an armature block connected to the top of the door in a position near the electromagnet. The armature moves between a down inoperative position away from the electromagnet, facilitated by gravity, when the electromagnet is deenergized and an up extended operative position against the underside of the electromagnet housing when the electromagnet is energized. A locking plate connected to the housing has a tab which depends therefrom and abuts the armature when the latter is in the up position to lock the door closed in the door frame. The improvement prevents slow separation of the armature and tab and hesitant unlocking of the door when the electromagnet is deenergized. It is a separation accelerator which may be one or more flexible resilient elastomeric plugs, springs, ball and spring arrays, plug and spring arrays or the like in pockets in the top surface of the armature and projecting upwardly therefrom, but readily compressible by the electromagnet housing. When the electromagnet is deenergized, the armature is sprung away therefrom by the accelerator and also by gravity for improved operation. When the electromagnet is energized, the accelerator acts as a cushioning device to lower the amount of noise generated by the mating of the armature to the electromagnet.
REFERENCES:
patent: 545277 (1895-08-01), Feinberg
patent: 3492037 (1970-01-01), Hutchinson
patent: 4696500 (1987-09-01), Zunkel
patent: 4826223 (1989-05-01), Geringer et al.
Geringer Arthur
Geringer David
Geringer Richard
Moore Richard E.
Posta Jr. John J.
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