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US 5,257,549 AGranted
Variable range load cell system and method of application
AssigneeLockheed Corporation
InventorPhilip J. Mole
Life of this patent
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AssigneeLockheed Corporation
InventorPhilip J. Mole
Estimating the term…
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.
A load cell arrangement which is operative for precisely measuring loads over a range beyond the functional range of a single load cell and which comprises:
A variable load cell measuring arrangement for accurately measuring loads over a predetermined functional range comprising:
A method for accurately measuring loads applied to a load measuring element positioned in a case, said loads being greater than the functional range of a measuring element which comprises the steps of:
Dependencies are inferred from the claim text.