ANZEIGEGERAET ZUR MESSUNG RELATIVER VERSCHIEBUNGEN EINES FEDERBELASTETEN TASTGLIEDES

摘要

A dial indicator for use on apparatus for measuring Rockwell hardness and ovality or out-of-roundness. A sensing spindle is biased axially and movable axially in opposite directions in response to variations in a surface being sensed. The spindle comprises a rack driving a pinion during axial travel thereof for driving an auxiliary pointer with which the reference axial position of the sensing spindle is established. A magnification gear is coupled to the pinion through a slip clutch coupling a main pointer to the sensing spindle. The sensing spindle is stopped by a stop cooperative with the magnification gear to establish a reference position from which indications are made. The reference position of the sensing spindle is a position from which indicated sensing of the sensing spindle is initiated. The use of the auxiliary pointer results in a precise reference condition being established for the dial indicator.