Closure fasteners – Magnetic
Patent
1991-12-23
1993-02-09
Nicholson, Eric K.
Closure fasteners
Magnetic
361155, 361144, 29234116, H01H 4700, E05C 1756
Patent
active
051848554
ABSTRACT:
An electromagnetic door lock assembly employs an electromagnet positioned in a frame adjacent to a door, power source for providing power to the electromagnet, and an adjustable armature assembly positioned in the door for interaction with the electromagnet. The armature assembly includes an armature plate having a front surface and a back surface opposite from the front surface, a backing plate situated adjacent to the back surface of the armature plate, a stem coupling the backing plate to the armature plate including a spring biasing the backing plate and armature plate toward each other, a mounting plate for mounting the armature assembly to a door to be locked, adjusting screws for adjustably positioning the backing plate at a fixed position with respect to the mounting plate so that the armature plate is positioned at a first position for optimum interaction with the electromagnet, the screws having elongated heads for maintaining the relative alignment between the armature plate and the mounting plate as the armature plate moves between said first position and a position contiguous to the electromagnet.
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Baker Donald D.
Dye William P.
Waltz Kevin P.
Nicholson Eric K.
Palermo Robert F.
Richardson A. James
Von Duprin, Inc.
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