Pressure-responsive device

Claim 1

A FLUID-PRESSURE INDICATOR COMPRISING AN ELONGATED HOLLOW FLEXIBLE-WALLED TUBE OPEN AT ONE END AND CLOSED AT ITS OPPOSITE END, MEANS FACILITATING COMMUNICATION OF THE OPEN END OF THE TUBE WITH THE FLUID PRESSURE BEING SENSED, A HOUSING, ROLLER MEANS MOUNTED FOR SUBSTANTIALLY LINEAR RECIPROCATORY MOVEMENT IN SAID HOUSING AND CLAMPINGLY ENGAGING THE TUBE BODY INTERMEDIATE ITS OPEN AND CLOSED ENDS, AN AXIAL TRUNNION CARRIED BY SAID ROLLER MEANS AND PROJECTING FROM OPPOSITE ENDS THEREOF, SPRING MEANS URGING SAID ROLLER MEANS IN A DIRECTION TENDING TO CONSTRICT THE TUBE UPON A DECREASE IN THE PRESSURE BEING SENSED, AN INCREASE IN PRESSURE CAUSING THE TUBE TO EXPAND AND DRIVE SAID ROLLER MEANS IN THE OPPOSITE DIRECTION AGAINST THE TORSIONAL RESISTANCE OF SAID SPRING, A TAPEACTUATING ROLLER MOUNTED FOR SUBSTANTIALLY LINEAR RECIPROCATORY MOVEMENT WITH SAID ROLLER MEANS, A FLEXIBLE TAPE BEARING INDICIA REPRESENTING UNITS OF PRESSURE PASSED OVER SAID TAPE-ACTUATING ROLLER AND HAVING ITS ONE END ANCHORED TO SAID CASE, AND A SPRING-BIASED TAPE TAKEUP ROLLER ON WHICH THE TAPE WINDS AND UNWINDS AS THE TAPE-ACTUATING ROLLER RECIPROCATES IN RESPONSE TO CHANGES IN PRESSURE OF THE FLUID BEING SENSED.