Compact rare earth magnet security switch assembly

Details Compact rare earth magnet security switch assembly Compact rare earth magnet security switch assembly

1996-02-01

1997-06-03

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

335207, H01H 900

Patent

active

056358873

ABSTRACT:
A method and an apparatus employing a compact magnetic security switch for detecting the open or closed position of corresponding fixed frame and movable closure members, such as door and window assemblies, of entryways of buildings. The security switch assembly includes a high intrinsic coercive force rare earth, preferably neodymium, alloy magnet mountable on a movable closure member within a close clearance and within a predetermined gap and break distance of a switch mounted on a corresponding fixed frame member when in closed position, such that the electrical contacts interact with the magnet and thereby place the switch in a nonalarm position. The method of the present invention provides for mounting the rare earth alloy magnet without invading the subsurface structural integrity of the movable closure member. The rare earth alloy magnet has a generally flat configuration and is adaptable to unobtrusive and noninvasive shallow recess or surface mounting in tight-fitting structures having close clearances.

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patent: 5438869 (1995-08-01), Mueller et al.
Cookson Magnet Sales, Inc., High Performance Permanent Magnets 4, Magnet Sales and Manufacturing Company, 1993.

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