Force transducer

Details Force transducer Force transducer

G - Physics

01

L

340/133, 73/70

G01L 1/04 (2006.01) G01G 3/12 (2006.01) G01G 7/06 (2006.01) G01L 1/14 (2006.01)

Patent

CA 1219320

ABSTRACT OF THE DISCLOSURE A force transducer includes a pair of opposed rigid-body force summing members and a pair of beam members extending between and coupling the force summing members to form a parallelogram structure. Sensor members mounted on the force summing members or the beam members extend towards one another and include opposing sensing portions which are mutually offset and carry conductive elements to form a variable capacitive gap. A rigid force input member transmits a central applied force to one end of the parallelogram structure. A rigid support member transmits a reaction force to the opposite end of the parallelogram, The entire force transducer, including the force summing beam, force input, and support members, may be formed from a single piece of dielectric material. In a low cost embodiment the transducer has a "sandwich" construction. The force summing members support sensor members that oppose one another. The beams are each an integral, monolithic member with a thin, flexible central portion and a pair of end pieces that have a much larger (preferably at least four times greater) cross-sectional area than the thin central portion. A thin layer of bonding material secures a large area face of the end pieces to an adjacent face of a force summing member.

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