Dual bore alignment and concentricity gauge

Claim 1

A DUAL BORE ALIGNMENT AND CONCENTRICITY GAUGE FOR CHECKING THE ALIGNMENT AND CONCENTRICITY OF FIRST AND SECOND WORKPIECE BORES RELATIVELY TO A THIRD REFERENCE BORE IN A MEASURING FIXTURE, SAID GAUGE COMPRISING AN ELONGATED HOLLOW SUPPORT HAVING A FORWARD PORTION ADAPTED TO ENTER THE WORKPIECE BORES AND A PRECISELY-MACHINED REARWARD PORTION HAVING A LONGITUDINALLY-EXTENDING EXTERNAL PILOT SURFACE WITH A CONFIGURATION WHICH IS THE ACCURATE COUNTERPART OF THE REFERENCE BORE AND WHICH IS ADAPTED TO ACCURATELY FIT THE REFERENCE BORE, SAID FORWARD PORTION HAVING THEREIN FORWARD AND REARWARD TRANSVERSE BORES SPACED LONGITUDINALLY APART FROM ONE ANOTHER IN PARALLEL AXIS RELATIONSHIP; FORWARD AND REARWARD MEASURING ELEMENTS RECIPROCABLY MOUNTED IN SAID FORWARD AND REARWARD TRANSVERSE BORES AND HAVING EXTERNAL BORE-ENGAGING CONTACT PORTIONS, FORWARD AND REARWARD DIAL INDICATORS MOUNTED ON THE REARWARD PORTION OF SAID HOLLOW SUPPORT AND HAVING MOVABLE OPERATING MEMBERS EXTENDING INTO THE INTERIOR THEREOF, AND FORWARD AND REARWARD MOTION-TRANSMITTING MECHANISMS OPERATIVELY CONNECTING SAID FORWARD AND REARWARD MEASURING ELEMENTS TO SAID FORWARD AND REARWARD DIAL INDICATORS RESPECTIVELY, SAID FORWARD AND REARWARD MOTION-TRANSMITTING MECHANISMS BEING FREELY MOVABLE IN OPPOSITE DIRECTIONS IN RESPONSE TO THE MOTIONS OF SAID FORWARD AND REARWARD MEASURING ELEMENTS IN OPPOSITE DIRECTION CONSEQUENT UPON THE SLIDING ENGAGEMENT OF SAID MEASURING ELEMENTS RELATIVELY TO SAID FIRST AND SECOND WORKPIECE BORES FOR SHIFTING SAID DIAL INDICATOR OPERATING MEMBERS IN OPPOSITE DIRECTIONS TO ACTUATE SAID DIAL INDICATORS IN CONCENTRICITY-INDICATING ACTION.