Noncontacting linear dimension optical measuring device

Claim 1

OPTICAL APPARATUS FOR MEASURING THE DIAMETERS OF WORKPIECES COMPRISING, IN COMBINATION, A PAIR OF TELESCOPIC SIGHTS HAVING PARALLEL OPTICAL AXES, GUIDE MEANS FOR SAID TELESCOPIC SIGHTS, MEANS FOR RENDERING SAID TELESCOPIC SIGHTS DISPLACEABLE ON SAID GUIDE MEANS IN A DIRECTION TRANSVERSE TO SAID AXES SO THAT SAID AXES ARE RESPECTIVELY IN TANGENTIAL RELATION TO TWO END POINTS OF A DIAMETER OF THE WORKPIECE, SCALE MEANS ASSOCIATED WITH SAID GUIDE MEANS BETWEEN AND AT RIGHT ANGLES TO THE TELESCOPIC SIGHTS, WHERE FROM THE DISPLACEMENT OF SAID TELESCOPIC SIGHTS ON SAID GUIDE MEANS CAN BE READ, A FIRST AND SECOND LIGHT PROJECTING UNIT DISPOSED AT OPPOSITE SIDES OF THE WORKPIECE FOR PROJECTING REFERENCE MARKS IN THE DIRECTION OF SAID DIAMETER OF THE WORKPIECE ONTO SAID TWO END POINTS OF SAID DIAMETER OF THE WORKPIECE, AND A FIRST AND A SECOND ADJUSTABLE DIAPHRAGM ASSOCIATED WITH SAID FIRST AND SAID SECOND PROJECTING UNIT, RESPECTIVELY, FOR ADJUSTING THE WIDTH OF PROJECTED REFERENCE MARKS IN DIRECTION OF SAID AXES, AND SAID TELESCOPIC SIGHTS BEING ADJUSTABLE ON SAID GUIDE MEANS TO PLACE THE REFERENCE MARKS IN ALIGNMENT WITH THE OPTICAL AXIS OF THE RESPECTIVE TELESCOPIC SIGHTS, WHEREBY THE WORKPIECE CAN ROTATE DURING MEASURMENT, MEANS FOR PROJECTING A FIRST AND SECOND PAIR OF PARALLEL LIGHT MARKS INTO THE RANGE OF VISION OF SAID TELESCOPIC SIGHTS, RESPECTIVELY, AS A REFERENCE MEANS FOR DETERMINING AND ADJUSTING THE POSITIONS OF THE LIGHT BANDS PRODUCED BY SAID PROJECTING UNITS IN COOPERATION WITH SAID ADJUSTABLE DIAPHRAGMS.