Low cost fluid pressure servomotor

Claim 1

IN A FLUID PRESSURE MOTOR: A HOUSING HAVING FRONT AND REAR ENDS THROUGH WHICH AN IMAGINARY AXIS EXTENDS; A MOVABLE ELEMENT HAVING A RECESS IN ITS OUTER SURFACE, SAID RECESS BEING OF UNIT CONSTRUCTION AND HAVING A SMOOTH BOTTOM SURFACE OF A PREDETERMINED DIMENSION, AND THE FRONT END WALL OF SAID RECESS EXTENDING GENERALLY RADIALLY OUTWARDLY TO A POINT LEAVING A SMALL ANNULAR SPACE BETWEEN SAID WALL AND SAID HOUSING TO PROVIDE A DIAPHRAGM ABUTMENT SURFACE; A DIAPHRAGM OF A STRETCHABLE MATERIAL THE MAJOR PORTION OF WHICH ABUTS SAID DIAPHRAGM ABUTMENT SURFACE, SAID DIAPHRAGM HAVING A CENTRAL OPENING THERETHROUGH WHICH OPENING IS LESSER DIMENSION THAN SAID BOTTOM SURFACE OF SAID RECESS SUCH THAT AN INTERFERENCE FIT IS FORMED BETWEEN THE OPENING OF SAID DIAPHRAGM AND SAID BOTTOM OF SAID RECESS, WHICH INTERFERNCE FIT SEALINGLY CONNECTS SAID DIAPHRAGM TO SAID MOVABLE WALL, SAID DIAPHRAGM LAYING UP AGAINST SAID ABUTMENT SURFACE TO PROVIDE FRICTIONAL CONTACT THEREWITH; AND THE OUTER PERIPHERY OF SAID DIAPHRAGM BEING SEALED TO SAID HOUSING.