Closure fasteners – Magnetic
Patent
1987-02-13
1989-06-20
Smith, Gary L.
Closure fasteners
Magnetic
335261, 292144, E05C 1716
Patent
active
048404110
ABSTRACT:
An electromagnetic shear lock comprising an electromagnewt having an E-shaped cross section with a coil positioned about the middle leg of the E is mounted in a doorway and an armature having a central projection is mounted to the door, where the middle leg of the E is shortened to define a recess to receive the armature projection and provide mechanical reinforcement against shearing when the electromagnet is energized. The inner edges of the outer legs of the E and the edges of the armature projection are matingly beveled to prevent binding when the electromagnet is de-energized and an airgap is defined between the middle leg of the E and the armature projection to overcome any effects of residual magnetism.
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Harrow Products Inc.
Montgomery Robert H
Nicholson Eric K.
Smith Gary L.
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