Measuring and testing – Dynamometers – Responsive to force
Patent
1982-03-18
1984-08-07
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to force
177210C, 361283, G01L 114
Patent
active
044636148
ABSTRACT:
A force transducer includes a pair of rigid force summing members that each extend toward one another along a central axis and a pair of beam members that each extend along the central axis and couple the force summing members to form a parallelogram frame. More specifically, the beam members are mounted to the force summing members to provide a frame such that a force applied to one force summing member along a first reference axis and resisted on the opposite side of the other force summing member produces a flexing of the beam members. The force summing members each include sensing members that also extend along the central axis toward one another. The sensing members are spaced from one another in the direction of the first reference axis. Electrically conductive members mounted on the opposite faces of the sensor form a variable gap capacitor that is integral with the frame. The flexing of the frame produces a change in the gap that relates to the applied force. The force summing and beam members are formed of a dielectric material. In one form each beam member is integral with an associated force summing member, the beam member being defined by an open slot. The beam members are each tapered along the central axis and toward the variable gap. In one form of the construction the beam member portions associated with each force summing member are joined at a point of inflection (i.e. the zero bending moment point) of the beam as joined. In the preferred form, the beam members and the associated force summing members are integral, monolithic and each force summing member and associated beam and sensor portions is identical to the other.
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Ruehl Charles A.
Setra Systems, Inc.
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