Protected retractible feeler bore concentricity gauge

Claim 2

THE COMBINATION WITH A DIAL INDICATOR HOLDER INCLUDING A STATIONARY HANDLE STRUCTURE HAVING A DIAL INDICATOR THEREON AND A ROTARY HANDLE STRUCTURE ROTATABLY CONNECTED TO SAID STATIONARY HANDLE STRUCTURE, OF AN ELONGATED HOLLOW STEM CONNECTED IN COAXIAL RELATIONSHIP TO SAID ROTARY HANDLE STRUCTURE FOR ROTATION THEREBY AND HAVING AN EXTERNAL REFERENCE SURFACE THEREON ADAPTED TO FIT A CONCENTRICITY REFERENCE BORE, SAID STEM HAVING A LONGITUDINAL BORE THEREIN COAXIAL WITH THE AXIS OF ROTATION OF SID HANDLE STRUCTURE AND A FIRST TRANSVERSE BORE DISPOSED REMOTE FROM SAID HANDLE STRUCTURE IN COMMUNICATION WITH SAID LOGITUDINAL BORE, A TRANSVERSELY-RECIPROCABLE MEASURING MEMBER RECIPROCABLY MOUNTED IN SAID FIRST TRNSVERSE BORE AND HAVING A WORKPIECE BORE-CONTACTING FEELER PORTION OPERATIVELY CONNECTED THERETO, MOTION-TRANSMITTING MECHANISM EXTENDING FROM SAID MEASURING MEMBER THROUGH SAID STEM AND HANDLE STRUCTURES TO THE DIAL INDICATOR AND RESPONSIVE TO THE TRANSVERSE SHIFTING OF SAID MEASURING MEMBER BY THE ENGAGEMENT OF SAID FEELER PORTION, AND A DIAL INDICATOR ZERO-SETTING GAUGE HAVING A ZEROSETTING SURFACE THEREON OF A RADIUS FROM THE AXIS OF SAID STEM EQUAL TO THE ZERO POSITION RADIUS ON THE DIAL OF THE DIAL INDICATOR AND MOVABLY CONNECTED TO SAID STEM FOR TRAVEL SELECTIVELY INTO AND OUT OF ENGAGEMENT WITH SAID MEASURING MEMBER FEELER PORTION.

Claim 3

THE COMBINATION WITH A DIAL INDICATOR HOLDER INCLUDING A STATIONARY HANDLE STRUCTURE HAVING A DIAL INDICATOR THEREON AND ROTARY HANDLE STRUCTURE ROTATABLY CONNECTED TO SAID STATIONARY HANDLE STRUCTURE OF AN ELONGATED HOLLOW STEM CONNECTED IN COAXIAL RELATIONSHIP TO SAID ROTARY HANDLE STRUCTURE FOR ROTATION THEREBY AND HAVING AN EXTERNAL REFERENCE SURFACE THEREON ADAPTED TO FIT A CONCENTRICITY REFERENCE BORE, SAID STEM HAVING A LONGITUDINAL BORE THEREIN COAXIAL WITH THE AXIS OF ROTATION OF SAID HANDLE STRUCTURE AND A FIRST TRANSVERSE BORE DISPOSED REMOTE FROM SAID HANDLE STRUCTURE IN COMMUNICATION WITH SAID LONGITUDINAL BORE, A TRANSVERSELY-RECIPROCABLE MEASURING MEMBER RECIPROCABLY MOUNTED IN SAID FIRST TRANSVERSE BORE AND HAVING A WORKPIECE BORE-CONTACTING FEELER PORTION OPERATIVELY CONNECTED THERETO, MOTION-TRANSMITTING MECHANISM EXTENDING FROM SAID MEASURING MEMBER THROUGH SAID STEM AND HANDLE STRUCTURES TO THE DIAL INDICATOR AND RESPONSIVE TO THE TRANSVERSE SHIFTING OF SAID MEASURING MEMBER BY THE ENGAGEMENT OF SAID FEELER PORTION, SAID MEASURING MEMBER HAVING A RETRACTION PORTION THEREON INCLINED RELATIVELY TO THE AXIS OF SAID STEM AND SAID MOTION-TRANSMITTING MECHANISM INCLUDING A RECIPROCABLE MEMBER HAVING A RETRACTION-EFFECTING PORTION THEREON OPERATIVELY CONNECTED TO SAID RECIPROCABLE MEMBER AND ENGAGEABLE WITH SAID RETRACTION PORTION, AND MEANS FOR SELECTIVELY MOVING SAID RECIPROCABLE MEMBER IN A RETRACTION-EFFECTING DIRECTION.

Claim 4

THE COMBINATION WITH A DIAL INDICATOR HOLDER INCLUDING A STATIONARY HANDLE STRUCTURE HAVING A DIAL INDICATOR THEREON AND ROTARY HANDLE STRUCTURE ROTATABLY CONNECTED TO SAID STATIONARY HANDLE STRUCTURE OF AN ELONGATED HOLLOW STEM CONNECTED IN COAXIAL RELATIONSHIP TO SAID ROTARY HANDLE STRUCTURE FOR ROTATION THEREBY AND HAVING AN EXTERNAL REFERENCE SURFACE THEREON ADAPTED TO FIT A CONCENTRICITY REFERENCE BORE, SAID STEM HAVING A LONGITUDINAL BORE THEREIN COAXIAL WITH THE AXIS OF ROTATION OF SAID HANDLE STRUCTURE AND A FIRST TRANSVERSE BORE DISPOSED REMOTE FROM SAID HANDLE STRUCTURE IN COMMUNICATION WITH SAID LONGITUDINAL BORE, A TRANSVERSELY-RECIPROCABLE MEASURING MEMBER RECIPROCABLY MOUNTED IN SAID FIRST TRANSVERSE BORE AND HAVING A WORKPIECE BORE-CONTACTING FEELER PORTION OPERATIVELY CONNECTED THERETO, MOTION-TRANSMITTING MECHANISM EXTENDING FROM SAID MEASURING MEMBER THROUGH SAID STEM AND HANDLE STRUCTURES TO THE DIAL INDICATOR AND RESPONSIVE TO THE TRANSVERSE SHIFTING OF SAID MEASURING MEMBER BY THE ENGAGEMENT OF SAID FEELER PORTION, SAID MEASURING MEMBER HAVING A RETRACTION PORTION THEREON INCLINED RELATIVELY TO THE AXIS OF SAID STEM AND SAID MOTION-TRANSMITTING MECHANISM INCLUDING A RECIPROCABLE MEMBER HAVING A RETRACTION-EFFECTING PORTION THEREON OPERATIVELY CONNECTED TO SAID RECIPROCABLE MEMBER AND ENGAGEABLE WITH SAID RETRACTION PORTION, AND MEANS FOR SELECTIVELY MOVING SAID RECIPROCABLE MEMBER IN A RETRACTION-EFFECTING DIRECTION.