Fluid operated switch actuator

Claim 1

A FLUID OPERATED SWITCH ACTUATOR COMPRISING A HOUSING DEFINING A CAVITY THEREIN, A COVER MEMBER SEALABLY CONNECTED TO SAID HOUSING, A BELLOWS SECURED TO SAID COVER DEPENDING INTO SAID CAVITY, A COIL SPRING MOUNTED WITHIN SAID BELLOWS AXIALLY THEREOF TO BIAS SAID BELLOWS INTO SAID CAVITY, A FLUID INLET TO SAID CAVITY EXTERNALLY OF SAID BELLOWS, A CONTROL ROD EXTENDING AXIALLY THROUGH SAID COVER AND SECURED TO SAID BELLOWS FOR AXIAL MOVEMENT IN ACCORDANCE WITH THE EXPANSION AND CONTRACTION OF SAID BELLOWS IN SAID CAVITY, SAID ROD HAVING AN AXIAL HOLE THEREIN OPENING OUTWARDLY OF SAID COVER AND HAVING A THREADED WALL, A SCREW THREADEDLY RECEIVED IN SAID HOLE, A SPUR GEAR SECURED TO SAID SCREW, A PINION GEAR ROTATABLY CARRIED BY SAID HOUSING IN OPERATIVE MESHING ENGAGEMENT WITH SAID SPUR GEAR WHEREBY ROTATION OF SAID PINION GEAR CAUSES AXIAL MOVEMENT OF SAID SCREW IN SAID ROD, A SWITCH MOUNTED TO SAID HOUSING BEYOND THE EXPOSED END OF SAID SCREW, SAID SWITCH HAVING AN ACTUATOR DISPOSED AXIALLY OF SAID SCREW, SAID ACTUATOR BEING OPERATED BY MOVEMENT THEREOF ALONG THE AXIS OF SAID SCREW, AND MEANS OPERATIVELY CONNECTING SAID SCREW TO SAID ACTUATOR WHEREBY AXIAL MOVEMENT OF SAID SCREW OPERATES SAID SWITCH.