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Force sensors

  • US 4,594,898 A
  • Filed: 06/06/1984
  • Issued: 06/17/1986
  • Est. Priority Date: 06/07/1983
  • Status: Expired due to Term
First Claim
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1. A beam structure for a vibrating beam force sensor of the type wherein a beam or strip of a piezoelectric material mounted at either end is piezoelectrically driven into flexural vibration while under stress, a change in the vibrational frequency indicating a change in the stressing force, wherein the structure comprises at least three coplanar beams, a common pair of mountings for these beams, and the beams are spaced side by side and supported between the common mountings one at either end of the beams for flexural vibration in a plane normal to the beams'"'"' common plane, and wherein the three coplanar beams generally are of the same length, but the breadth of each of the two outer beams is half that of the inner one, said beams in operation flexing in a direction normal to the plane of the beams, with the two outer beams flexing in opposite phase to the inner beam.

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