Measuring and testing – Dynamometers – Responsive to force
Patent
1991-07-12
1993-11-02
Chilcot, Jr., Richard E.
Measuring and testing
Dynamometers
Responsive to force
73862382, G01L 100
Patent
active
052575497
ABSTRACT:
A variable load cell arrangement operative for precisely measuring loads over a range beyond the range of a single conventional single low range load cell. The arrangement includes a low range measuring element positioned in a case and having one end adapted to be connected through the case to a load and the opposing end coupled to a fixed reference. A variable pressure means, such as a controllable bellows, is interposed in the case between the load element and an end of the case whereby a predetermined force may be selectively applied to the load measuring element in a direction opposing the load to relieve the strain on the element and permit it to continue to function in an extended range. Electrical circuits, including Wheatstone bridges, are coupled to the load measuring element and provide an electrical output indicative of the applied load and an electrical output that is used to control the variable pressure means.
REFERENCES:
patent: 2157723 (1939-05-01), Wilson
patent: 2570321 (1951-10-01), Christoffer
patent: 2582886 (1952-01-01), Ruge
patent: 2588387 (1952-03-01), Hughes
patent: 3121328 (1964-02-01), Todd et al.
patent: 4113040 (1978-09-01), Storace
patent: 4586388 (1986-05-01), Tanaka et al.
Biegel Ronald L.
Chilcot Jr. Richard E.
Duncan John R.
Gilliam Frank D.
Lockheed Corporation
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