Tracer system and mechanism therefor for profile or scanning operations

Claim 1

A TRACER MECHANISM COMPRISING IN COMBINATION A HOUSING, AN ELONGATED TRACER STYLUS, MEANS TO MOUNT SAID TRACER STYLUS IN THE HOUSING FOR AXIAL MOVEMENT AND TILTING MOVEMENT, FIRST AND SECOND VALVE MEMBERS MOUNTED IN THE HOUSING IN SPACED RELATION AROUND THE TRACER STYLUS AND CONNECTED THERETO NINETY DEGREES APART FOR MOVEMENT IN RESPONSE TO TILTING MOVEMENT THEREOF, A THIRD VALVE MEMBER MOUNTED IN THE HOUSING AND MOVABLE IN THE AXIAL DIRECTION OF THE TRACER STYLUS, A FIRST VALVE ACTUATING MEMBER ON THE STYLUS ADAPTED TO ENGAGE SAID THIRD VALVE MEMBER TO EFFECT MOVEMENT THEREOF ON AXIAL MOVEMENT OF THE STYLUS, SAID FIRST VALVE ACTUATING MEMBER INEFFECTIVE TO MOVE SAID THIRD VALVE MEMBER ON TILTING MOVEMENT OF THE TRACER STYLUS, A SECOND VALVE ACTUATING MEMBER MOUNTED ON THE STYLUS AND EXTENDING LATERALLY THEREFROM FOR TILTING THEREWITH, AND MEANS TO EFFECT RELATIVE AXIAL SHIFTING BETWEEN SAID SECOND VALVE ACTUATING MEMBER AND SAID THIRD VALVE MEMBER TO EFFECT ENGAGEMENT AND DISENGAGEMENT THEREBETWEEN FOR SELECTIVE CONNECTION OF SAID THIRD VALVE MEMBER TO THE TRACER STYLUS FOR MOVEMENT IN RESPONSE TO TILTING MOVEMENT THEREOF.