Importance

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Abstract

A weigh scale apparatus in which forces caused by the applied load are transformed into moments of opposite sense and applied to opposite ends of a substantially rigid beam. Bending deflection of the beam is measured by centrally disposed strain gauge resistors to produce an electrical signal quantity proportional to the applied load. The conversion of applied load to moments of opposite sense is accomplished by a pair of spaced parallel pivot members which are suspended between the load receiving pan and the base such that the pivots tend to rotate in opposite directions. The beam is mechanically connected between the pivots such that it is subjected to the bending moment over substantially its entire length. A flexure hinge is provided adjacent each end of the beam to render the beam soft or compliant with respect to twisting forces imposed on the beam with the result that the twisting moment introduced into the beam in response to a given magnitude of twist is greatly reduced to a point where it generates no significant cross-talk in the beam such as would affect the accuracy of the bending stress being measured by the beam in response to the opposite rotation of the pivots.

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First Claim