Title: Vehicle weighing system transducer

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Abstract: A transducer for measuring the load of a vehicle employing an equalizing beam suspension. In an equalizing beam suspension a pair of tandem wheels are supported by opposite ends of a pair of transversely spaced, center-mounted equalizing beams. Each equalizing beam carries one of the transducers which measures the deflection of the respective equalizing beam responsive to vehicle loading. The transducer includes a push rod clamped to the equalizing beam and extending into a measurement block which is clamped to a different point on the equalizing beam. The measurement block contains a strain gauge instrumented cantilever beam against which the motion transmitting bar abuts. Consequently, the cantilever beam deflects responsive to movement of the motion transmitting bar toward and away from the measurement block produced by load induced deflections of the equalizing beams. The measurement block is essentially a plurality of stacked plates, one of which forms the cantilever beam. Two plates positioned on opposite faces of the cantilever beam plate contain cutouts for providing deflection clearance for the cantilever beam. A second pair of plates positioned toward the motion transmitting bar each contain an aperture through which the motion transmitting beam passes. The aperture through the inside plate loosely contacts the motion transmitting beam to prevent transverse movement thereof, and the aperture through the outside plate contains an O-ring seal for protecting the cantilever beam and strain gauge from dirt and moisture.


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