Load cell for use with electronic counting and weighing scales

Details Load cell for use with electronic counting and weighing scales Load cell for use with electronic counting and weighing scales

1981-04-22

1983-01-11

Hartary, Joseph W.

Weighing scales

Self-positioning

Electrical current generating or modifying

7386267, 177229, G01G 314

Patent

active

043678017

ABSTRACT:
A load cell is disclosed, which is especially applicable for use with electronic counting and/or weighing scales and the like. The load cell comprises a parallelogram-type flexure frame, and is characterized by four strain gauges, which are located at the upper and lower surfaces of two vertically overlying corner flexure regions of the parallelogram. This arrangement--because of symmetry considerations--is uniquely free of second-order errors generated by offset loading on the weight-receiving platform via which the generally vertically-directed forces to be measured by the cell are applied. At the same time, the arrangement provides two corners completely free of strain gauges, providing sites which can be trimmed by filing or so forth to compensate for small symmetry errors present in the load cell as originally fabricated and assembled.

REFERENCES:
patent: 2866059 (1958-12-01), Laimins
patent: 3577779 (1971-05-01), Laimins
patent: 3777828 (1973-12-01), Dietemeyer
patent: 3788411 (1974-01-01), Oxley
patent: 3927560 (1975-12-01), Farr
patent: 4043412 (1977-08-01), Rock
patent: 4128001 (1978-12-01), Marks
patent: 4219089 (1980-08-01), Gard
Perry et al., The Strain Gage Primer, McGraw-Hill, 1955, Second Edition, pp. 62-64 and 238-243.

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