Load cell

Details Load cell Load cell

1989-10-03

1990-08-21

Reynolds, Bruce A.

Electrical resistors

Strain gauge type

338 3, G01L 122

Patent

active

049510274

ABSTRACT:
A load cell comprises a distortion generating body including first and second arms each of which has a thickness y and which are arranged in parallel, and thin deformable portions of a thickness x, which are coupled to the two ends of each of the first and second arms and each of which has flat and curved surfaces facing each other, a height of the distortion generating body, a distance between both of the thin deformable portions coupled with both ends of each of the first and second arms, and a radius of curvature of the curved surface of the thin deformable portions being set to predetermined values H, D, and R, respectively, strain gauges insulatively formed on the flat surfaces of the thin deformable portions coupled with both ends of the first arm, and leading portions connecting the strain gauges to form a bridge circuit. The thickness y is given by a linear equation y=ax+b, and constants a and b are determined by a linear equation p=aq+b indicating the relation between thicknesses p and q with respect to a plurality of standard load cells each of which includes the distortion generating body having predetermined height H, predetermined distance D, and predetermined radius R. Each of the thin deformable portions has a thickness q and a thickness p of each of the first and second arms is set according to the thickness q to give a linear load weight-output voltage characteristic.

REFERENCES:
patent: 3600942 (1971-08-01), Brendle
patent: 4322707 (1982-03-01), Ort
patent: 4332174 (1982-06-01), Suzuki et al.
patent: 4343197 (1982-08-01), Suzuki et al.
patent: 4628296 (1986-12-01), Kitagawa et al.

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