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Hydraulic weighing apparatus

  • US 3,992,946 A
  • Filed: 12/11/1975
  • Issued: 11/23/1976
  • Est. Priority Date: 12/11/1975
  • Status: Expired due to Term
First Claim
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1. A weighing apparatus including at least one hydraulic load cell comprising:

  • A. a piston member,B. cooperating cylinder means having an inner cylindrical wall for receiving said piston member in freely interfittable, relatively reciprocally movable relation, andC. a flexible diaphragm of fluid impervious material sealed in said cylinder means and overlying said piston member to form a fluid pressure receiving chamber therebetween, an annular fold of said diaphragm interlying a portion of the free space between said cylindrical wall and said piston member,said cylinder means having an undercut portion underlying the inner cylindrical wall to permit the inner cylindrical wall to flex in the radial direction in response to fluid pressure received in said pressure receiving chamber and said annular diaphragm fold to maintain the acting area of said diaphragm at a substantially uniform value independently of the relative position of said piston member and cylinder means.

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