Load cell for use with electronic counting and weighing scales
US4367801A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1981 |
| Grant date | Jan 11, 1983 |
| Priority date | — |
| Expiry date | Apr 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G19/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.