Measuring and testing – Dynamometers – Responsive to force
Patent
1981-12-24
1984-06-19
Hartary, Joseph W.
Measuring and testing
Dynamometers
Responsive to force
177211, 177229, 338 5, G01L 122
Patent
active
044547706
ABSTRACT:
A load cell having a parallelogram configuration formed by a pair of spaced-apart, generally parallel force-receiving members interconnected by a cantilever beam and a parallel spacer beam. The cantilever beam projects perpendicularly from one of the force-receiving members, and its end is secured to the other beam by a flexure hinge. The ends of the spacer beam are secured to the force-receiving members by respective flexure hinges. In order to maintain the parallelogram configuration of the load cell, the length of the spacer beam is equal to the length of the cantilever beam from the beam's virtual pivot point to its end. Rotational moments imparted to the force-receiving members apply forces to the beams along their longitudinal axes without deflecting the cantilever beam, thus making the load cell insensitive to such moments. A reduced thickness portion instrumented with semiconductor strain gauges is formed in the cantilever beam near its point of attachment with the force-receiving member. The reduced thickness portion accurately positions the virtual pivot point of the beam and it concentrates the stress at the strain gauges. The load cell may be used in a scale by securing one of the load-receiving members on a base and mounting a load-receiving tray on the other load-receiving member.
REFERENCES:
patent: 2859613 (1958-11-01), Green
patent: 2866059 (1958-12-01), Laimins
patent: 3161046 (1964-12-01), Farley
patent: 3805604 (1974-04-01), Ormond
patent: 3927560 (1975-12-01), Farr
patent: 4219089 (1980-08-01), Gard
Modern Strain Gage Transducers . . . Their Design and Construction; Epsilonics, vol. 2, No. 2, Jul. 1982, pp. 6-8.
Hartary Joseph W.
Kistler-Morse Corporation
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