LOAD SENSOR FOR GRAVITATIONAL CENTER OSCILLATION GAUGE

PROBLEM TO BE SOLVED: To measure only the load of a vertical direction by applying loads of upper and lower directions by a strain steel ball plate by using a steel ball disposed in an upper steel ball holding plate and a plurality of steel balls arranged in a lower steel ball holding plate and producing an output from a strain gauge disposed in the strain steel plate. SOLUTION: A strain steel plate 3 applies loads of upper and lower directions by a steel ball 7 inserted into a short silicon tube 8 and softly held in the center of an upper steel ball holding plate 6 and steel balls 13, 14 and 15 inserted into short silicon tubes 10, 11 and 12 and softly held in a portion close to both ends of a lower steel ball holding plate 9. By the loads, the steel plate produces flexibility in a direction for lowering the center and reduces one strain gauge 1 to reduce electric resistance. The steel plate expands the other strain gauge 2 to increase electric resistance. By connecting an electric circuit to these strain gauges 1 and 2, gravitational center oscillation is calculated.