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Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device

  • US 4,107,604 A
  • Filed: 12/01/1976
  • Issued: 08/15/1978
  • Est. Priority Date: 12/01/1976
  • Status: Expired due to Term
First Claim
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1. A position indicating device comprising:

  • a housing having a central bore, an electrical connector connected to one end of said housing in registry with said bore for providing electrical connection into and out of said housing, a guide and support tube having one end connected to said electrical connector and extending into said central bore at one end, said guide and support tube being generally rectangular in cross section, sensing means responsive to changes in magnitude of magnetic flux for providing an output signal varying in magnitude in accordance with the changes in magnitude of magnetic flux, said sensing means secured to the outer surface of said guide and support tube and magnet means located within said support tube for movement relative to said sensing means whereby the variations in magnitude of said output signal will be provided as a function of the relative position between said magnet means and said sensing means, display means operatively connected with said sensing means and responsive to said output signal for providing a display of the magnitude of the relative position between said magnet means and said sensing means, said magnet means comprising a bar magnet extending longitudinally along an axis and having a circular cross section and a support tube structure fixedly holding said bar magnet, said support tube structure having a generally rectangular cross section and being located within said guide and support tube for relative sliding movement therein, said magnet means including a return, coil spring connected with one end of said bar magnet and engageable with said electrical connector, a cap located in the opposite end of said central bore, a pin slidably supported in said cap and engageable with the opposite end of said bar magnet whereby axial movement of said pin will result in movement of said bar magnet relative to said sensing means, said sensing means comprising a Hall effect device secured to said guide and support tube with its Hall plate parallel to the axis of said bar magnet, said bar magnet having only one north magnetic pole located at one end and only one south magnetic pole located at the opposite end, said output signal indicating a null when said Hall plate is located substantially centrally of said north and south poles.

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