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High security balanced-type, magnetically-actuated proximity switch system

  • US 5,668,533 A
  • Filed: 06/07/1995
  • Issued: 09/16/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A balanced-type, magnetically-actuated proximity switch system, comprising:

  • a magnetic switch assembly mountable to a first structure, said magnetic switch assembly including (1) first and second switch magnets fixed in relative position wherein they are axially aligned and wherein adjacent ends thereof have the same polarity, and (2) first and second reed switches positioned on opposite outside ends of respective said first and second switch magnets and generally perpendicular to an axial magnet alignment and both operatively connectable to ab electric circuit; and

    an actuator magnet assembly mountable to a second structure which is movable between open and closed positions relative to the first structure;

    wherein said first and second reed switches, when the second structure is in the open position, are in a first condition relative to the electrical circuit indicating the open position, due to the magnetic influence of said first and second switch magnets thereon; and

    wherein said first and second reed switches, when the second structure is in the closed position, are in a second condition relative to the electrical circuit indicating the closed position, due to the magnetic influence of said actuator magnet assembly thereon.

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