Fluid pressure servomotor

Claim 1

A SERVOMOTOR COMPRISING: A HOUSING HAVING TWO PORTIONS WHICH ARE JOINED TOGETHERE WITH A SPACER MEANS ARRANGED TO SEALINGLY HOLD A FIRST FLEXIBLE MEMBER AND A SECOND FLEXIBLE MEMBER, SAID SPACER MEANS INCLUDING A DEPENDING PARTITION HAVING A CENTRAL OPENING; A FRONT MOVABLE WALL HAVING AN ANNULAR GROOVE WHOSE INTERNAL DIMENSION IS GREATE THAN AN OPENING DIAMETER OF SAID FIRST FLEXIBLE MEMBER TO PROVIDE AN INTERFERENCE FIT AS SAID FIRST FLEXIBLE MEMBER IS SNAP-FITTED INTO SAID GROOVE TO JOIN SAID FRONT MOVABLE WALL AND SAID FIRST FLEXIBLE MEMBER ON A FORWARD SIDE OF SAID PARTITION, SAID FRONT MOVABLE WALL INCLUDING AN INTEGRAL REARWARDLY PROJECTING TUBULAR MEMBER WHICH IS THREADED AT ITS REARMOST POINT AND A RADIAL SLOT AHEAD OF SAID THREADS, SAID REARWARDLY PROJECTING TUBULAR MEMBER BEING SEALINGLY AND SLIDABLY SUPPORTED IN THE CENTRAL OPENING OF SAID PARTITION AND OPEN BY MEANS OF A CENTRAL PASSAGE TO A FIRST VARIABLE VOLUME CHAMBER AHEAD OF SAID FRONT MOVABLE WALL TO COMMUNICATE SAME WITH AN AREA WITHIN SAID HOUSING BEHIND SAID PARTITION BY WAY OF SAID RADIAL SLOT; A REAR MOVABLE WALL HAVING AN ANNULR GROOVE WHOSE INTERNAL DIMENSION IS GREATER THAN AN OPENING DIAMETER OF SAID SECOND FLEXIBLE MEMBER TO PROVIDE AN INTERFERENCE FIT AS SAID SECOND FLEXIBLE MEMBER IS SNAP-FITTED INTO SAID GROOVE TO JOIN SAID REAR MOVABLE WALL AND SAID SECOND FLEXIBLE MEMBER IN SAID AREA TO CREATE A SECOND VARIABLE VOLUME CHAMBER AND A THIRD VARIABLE VOLUME CHAMBER AHEAD AND BEHIND SAID REAR MOVABLE WALL, RESPECTIVIVELY, SAID REAR MOVABLE WALL HAVING A THREADED BORE ON A FRONT FACE THEREOF RECEIVING SAID THREADED, REARWARDLY PROJECTING TUBULAR MEMBER TO JOIN SAID FRONT AND REAR MOVABLE WALLS, WHICH BORE IS OPEN TO A VALVE CAVITY IN SAID REAR MOVABLE WALL COMMUNICATED BY A SUBSTANTIALLY AXIAL PASSAGE IN SAID REAR MOVABLE WALL TO SAID SECOND VARIABLE VOLUME CHAMBER AND A RADIAL PASSAGE TO SAID THIRD VARIABLE VOLUME CHAMBER AND BY MEANS OF A TUBULAR EXTENSION TO THE EXTERIOR OF SAID HOUSING; A PASSAGE MEANS IN SAID HOUSING FOR COMMUNICATING SAID THIRD VARIABLE VOLUME CHAMBER TO A FOURTH VARIABLE VOLUME CHAMBER AHEAD OF SAID PARTITION BEHIND SAID FRONT MOVABLE WALL; AND VALVE MEANS IN SAID VALVE CAVITY TO SUSPEND THE FRONT AND REAR MOVABLE WALLS IN AN EQUAL PRESSURE MEDIUM OR TO CREATE A PRESSURE DIFFERENTIAL OF EQUAL MAGNITUDE ACROSS EACH OF SAID WALLS, SAID VALVE MEANS HAVING A LOST MOTION CONNECTION WITH SAID WALLS TO BE MECHANICALLY CONNECTED TO BOTH SAID WALLS BY ABUTTING SAID TUBULAR PROJECTION OF SAID FRONT WALL AFTER BEING OPERATED TO CREATE THE PRESSURE DIFFERENTIAL.