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Liquid level gage system

  • US 5,136,883 A
  • Filed: 08/24/1990
  • Issued: 08/11/1992
  • Est. Priority Date: 08/24/1990
  • Status: Expired due to Term
First Claim
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1. A liquid level gage system comprising:

  • a cable;

    a rotatable drum;

    a displacer secured to said cable and moveable in response to winding or unwinding said cable around or from around said rotatable drum;

    a driven shaft coupled to said rotatable drum;

    a drive assembly operatively coupled to said driven shaft to drive said driven shaft;

    an indicator assembly operatively coupled to said driven shaft to provide an indication of a change in the apparent weight of said displacer as said displacer is moved across a liquid level, said indicator assembly including an elongated member secured to said driven shaft and a strain gage secured to said elongated member away from said driven shaft; and

    a movement restrictor component located to contact said elongated member to provide the operative coupling between said drive assembly and said driven shaft, and together with said driven shaft acting to place a strain on said elongated member, said strain being sensed by said strain gage and being variable in response to variations in the apparent weight of said displacer, said strain gage providing a signal which is indicative of the amount of strain on said elongated member.

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