Closure fasteners – Magnetic
Patent
1976-12-10
1978-07-11
Moore, Richard E.
Closure fasteners
Magnetic
E05C 1756
Patent
active
040997553
ABSTRACT:
Several forms of releasable magnet door latches are disclosed. In one embodiment, a pull on a knob mounted in a housing attached to a door is translated by an inclined cam surface into rotary motion of an actuator rod extending into the door. The rod mounts a horseshoe magnet which is rotated with rotation of the rod. An intermediate member is mounted on the opposite surface of the door and contains a pair of ferromagnetic pole pieces which are spaced from each other and which act as extension of the poles of the horseshoe magnet in the ON position of the magnet. In such position, the magnet attracts a ferromagnetic plate mounted on the door frame. The intermediate member also contains a transverse shunt piece which bridges the poles of the magnet when the magnet has been rotated through an arc of 90.degree. to an OFF position. In the other embodiments, a rectangular permanent magnet having poles formed on opposite side surfaces has a pair of pole plates disposed on such side surfaces. The intermediate member mounted in the door contains a pair of spaced shunt bars which are aligned with the pole pieces to act as extensions thereof in the ON position, and which, upon the rotation of the magnet by the turning of a handle, bridge the pair of poles pieces to shunt the magnetic flux. In one of the other embodiments, the magnet and its pole pieces and the intermediate member constitute a subassembly in which extensions of the pole pieces are rotatably mounted within a central opening in the intermediate member and are restrained axially in such opening.
REFERENCES:
patent: 2117132 (1938-05-01), Baermann, Jr.
patent: 3288511 (1966-11-01), Tavano
patent: 3691688 (1972-09-01), Kaiserswerth
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