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Weighing scales

  • US 5,193,631 A
  • Filed: 05/10/1991
  • Issued: 03/16/1993
  • Est. Priority Date: 05/11/1990
  • Status: Expired due to Fees
First Claim
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1. A weighing scale for determining a weight of an article placed thereupon comprising:

  • a circular base;

    an annular collar being integrally formed and coaxial with said circular base, said collar defining a recess and being formed with a plurality of equally angularly spaced slots;

    a plurality of lever means being respectively received in said angularly spaced slots so as to project into said recess, each of said lever means adapted to pivot about a lower edge of its respective slot;

    a plunger means received in said recess and contacting a radially inner end of said lever means;

    a reservoir cover formed to cover said recess and adapted to be secured to said annular collar;

    a diaphragm received in said recess and adapted to be sealed in place between said cover and said collar;

    a platform contacting the radially outward ends of said lever means, said platform adapted to move relative to said base and said collar;

    a deformable reservoir formed between said diaphragm and said cover, said deformable reservoir being compressible in response to said weight of said article on said platform and containing a displaceable fluid;

    a display means in fluid communication with said deformable reservoir for displaying the volume of fluid displaced; and

    a recording means for temporarily recording the position of a meniscus of the fluid displaced from said reservoir;

    whereby in response to the weight being placed on said platform, said platform is translated relative to said collar, said lever means pivots about the lower end of it respective slot, said plunger is translated within said recess, said deformable reservoir is compressed, and said fluid is displaced from said deformable reservoir to said display means.

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