Strain gage load cell
US4338825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Oct 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Theload cell herein disclosed is designed for precise measurement of forces along or parallel to a single axis, while being substantially immune to forces applied along the other mutually perpendicular axes as well as moments applied about any of the three mutually perpendicular axes. Rigid force input and force output members are resiliently interconnected by a pair of parallel flexure beams which establish with such members a parallelogram type of linkage which is relatively yieldable to forces parallel to the selected measurement axis while being relatively stiff and unyieldable to forces parallel to the other two axes and to moments about any of the three axes. A strain gage-equipped sensing beam is mounted within the plane of the parallelogram linkage and between the two flexure beams. One end of the sensing beam is rigidly connected to the fixed force output member, while the other end is free to flex in cantilevered fashion responsive to displacement of the force input member. The sensing beam thereby provides part of the resilient interconnection between the force input and force output members, and is dimensioned so that its stiffness relative to that of the two flexure be…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.