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Angle change detector

  • US 4,571,844 A
  • Filed: 06/08/1983
  • Issued: 02/25/1986
  • Est. Priority Date: 06/09/1982
  • Status: Expired due to Fees
First Claim
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1. An angle change detector comprising:

  • a swingable pendulum of an electroconductive non-magnetic material;

    means for applying magnetic flux to the pendulum; and

    means for detecting the rotation of the pendulum;

    wherein said magnetic flux applying means comprises a pair of opposing magnets supported by a magnetic plate frame, said pendulum is pivotally mounted to the magnetic plate frame, said pendulum is pivotally mounted to the magnetic plate frame to swing past a spacing between the opposing magnets, and said detecting means comprises two photosensors disposed near opposite side edges of said pendulum and adjustable threshold circuits respectively connected with the two photosensors to produce an output signal when an output signal from the photosensor exceeds a predetermined selectable threshold level.

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