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Load cell and weighing apparatus including a strain sensor welded to a strain inducing device

  • US 5,539,158 A
  • Filed: 11/15/1994
  • Issued: 07/23/1996
  • Est. Priority Date: 12/27/1991
  • Status: Expired due to Fees
First Claim
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1. A load cell for use in detecting a load imposed thereon, said load cell comprising:

  • a strain inducing means made of metal for generating a strain as a function of the load;

    a strain sensor including a metal substrate having a strain detecting element formed thereon for detecting the strain generated in the strain inducing means, said metal substrate being of a generally rectangular shape having a pair of first sides opposite and parallel to each other and a pair of second sides opposite to each other, said metal substrate having a pair of strain generating areas defined therein and situated between said first sides while separated a distance from each other in a direction parallel to any one of the first sides, each of said strain generating areas being where stress build-up occurs;

    said detecting element being positioned at each of said strain generating areas for detecting the strain generated at the respective strain generating area and away from each of the second sides of the metal substrate;

    said strain sensor being mounted in the strain inducing means with the second sides of the metal substrate, spot-welded to said strain sensor, being oriented along a horizontal plane when in an unloaded mode and said second sides being positioned on horizontal mount surfaces of mount portions of the strain inducing means; and

    said metal substrate being a thin plate having a smaller cross-sectional area perpendicular to said first sides, than said mount portions.

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