Work dimension and position detecting, indicating and controlling method and apparatus

Claim 1

WORK DIMENSION AND POSITION INDICATING APPARATUS COMPRISING: A PNEUMATIC CYLINDER CONTAINING INTERMEDIATE ITS ENDS A PISTON DEFINING TWO CHAMBERS THEREIN, SAID PISTON HAVING A STEM EXTENDING OUT FROM AN END OF SAID CYLINDER; AIR GAGE MEANS POSITIONABLE OPERATIVELY ADJACENT THE WORK AND MOUNTING FOR MOVEMENT WITH SAID PISTON STEM, SAID AIR GAGE MEANS INCLUDING AT LEAST ONE GAGING NOZZLE; MEANS FOR SUPPLYING AIR UNDER PRESSURE TO SAID NOZZLE; MEANS FOR COMMUNICATING WORK-RESPONSIVE BACK PRESSURE AT SAID NOZZLE TO ONE OF SAID CHAMBERS; MEANS FOR SUPPLYING TO THE OTHER OF SAID CHAMBERS AIR UNDER PRESSURE CONSTANTLY PROPORTIONED TO THE AIR PRESSURE SUPPLIED TO SAID NOZZLE; MEANS FOR OPERATIVELY RELATING SAID PISTON TO A NOZZLE POSITION INDICATING GAGE; WHEREBY SAID NOZZLE IS BODILY POSITIONABLE AT A DETERMINED DISTANCE FROM SAID WORK AND DIMENSIONAL AND POSITIONAL VARIATIONS OF THE WORK RELATIVE TO THE NOZZLE ARE COMMUNICATED TO SAID PISTON AND ARE ADAPTED TO BE INDICATED AT SAID GAGE; AND MEANS FOR SUPPLYING AIR UNDER RELATIVELY GREATER PRESSURE TO THE NOZZLE-COMMUNICATING CHAMBER FOR RETRACTING AND AIR GAGE MEANS FROM THE WORK.