The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1990
Filed:
Oct. 03, 1989
Tohru Kitagawa, Mishima, JP;
Takaharu Yamasita, Shizuoka, JP;
Tokyo Electric Co., Ltd., Tokyo, JP;
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.