Valving arrangement for fluid pressure device

Claim 1

IN A FLUID PRESSURE DEVICE, CASING MEANS, SAID CASING DEFINING INTERNALLY THEREOF A FLAT WALL SURFACE AND A PLURALITY OF PASSAGES, SAID PASSAGES HAVING EQUALLY SPACED OPENINGS IN SAID WALL SURFACE ARRANGED CIRCUMFERENTIALLY RELATIVE TO A REFERENCE AXIS, CHAMBER FORMING MEANS FOR FORMING EXPANDING AND CONTRACTING CHAMBERS HAVING FLUID COMMUNICATION WITH SAID PASSAGES, GENERALLY RING SHAPED VALVE MEANS ECCENTRICALLY DISPOSED RELATIVE TO SAID AXIS AND HAVING AN END SURFACE SLIDABLY ENGAGING SAID CASING WALL SURFACE, SAID VALVE MEANS COOPERATING WITH SAID CASING TO DEFINE INTERIOR AND EXTERIOR VALVE CHAMBERS, DRIVE MEANS BETWEEN SAID CHAMBER FORMING MEANS AND SAID VALVE MEANS FOR ORBITING SAID VALVE MEANS ABOUT SAID AXIS IN SYNCHRONISM WITH SAID CHAMBER FORMING MEANS, SAID OPENINGS BEING SPACED FROM SAID AXIS SO THAT UPON ORBITING OF SAID VALVE MEANS SAID OPENINGS CONNECTED TO SAID EXPANDING CHAMBERS HAVE FLUID COMMUNICATION WITH ONE OF SAID VALVE CHAMBERS AND SAID OPENINGS CONNECTED TO SAID CONTRACTING CHAMBERS HAVE FLUID COMMUNICATION WITH THE OTHER OF SAID VALVE CHAMBERS, SAID VALVE MEANS HAVING EQUAILATERAL POLYGONAL SIDES WITH EACH SIDE HAVING PARALLEL EDGES, SAID SIDES BEING EQUAL IN NUMBER TO SAID OPENINGS, SAID OPENINGS BEING ELONGATED AND ARRANGED TANGENTIALLY TO A CIRCLE HAVING ITS CENTER COINCIDENT WITH SAID AXIS, EACH OF SAID OPENINGS HAVING PARALLEL SIDES, VALVE RESTRAINING MEANS FOR LIMITING THE MOVEMENT OF SAID VALVE TO ONLY ORBITAL MOVEMENT RELATIVE TO SAID AXIS, SAID VALVE MEANS BEING INDEXED RELATIVE TO SAID OPENINGS BY SAID VALVE RESTRAINING MEANS SO THAT EACH OF SAID VALVE SIDES ARE PARALLEL TO A CORRESPONDING ONE OF SAID OPENINGS DURING SAID ORBITAL MOVEMENT OF SAID VALVE MEANS, AND SAID CASING HAVING FLUID INLET AND OUTLET MEANS IN RESPECTIVE FLUID COMMUNICATION WITH SAID INTERIOR AND EXTERIOR VALVE CHAMBERS.