Fluid pressure pump or motor

Claim 1

A FLUID PRESSURE PUMP COMPRISING IN COMBINATION: A. A FRAME HAVING, B. A PAIR OF SPACED SIDE PLATES HAVING INNER FACES FACING TOWARD EACH OTHER, C. A DRIVE SHAFT JOURNALED IN SAID SIDE PLATES, D. A ROTOR FIXED TO SAID DRIVE SHAFT AND LOCATED BETWEEN SAID SIDE PLATES, E. ROTOR VANES RADIALLY RECIPROCATABLE IN SLOTS FORMED IN SAID ROTOR, F. A PLURALITY OF ROCKABLE SEGMENTS PIVOTALLY MOUNTED BETWEEN SAID INNER FACES OF SAID SIDE PLATES HAVING ARCUATE VANE CONTACTING SURFACES ADAPTED TO SLIDINGLY ENGAGE THE OUTER EDGES OF SAID ROTOR VANES DURING ROTATION ON SAID ROTOR, G. PIVOTAL CONNECTIONS BETWEEN EACH OF SAID ROCKING SEGMENT ELEMENTS LOCATED ADJACENT TO THE ENDS OF EACH OF SAID ARCUATE VANE CONTACTING SURFACES, H. AND MEANS FOR ROCKING AT LEAST ONE OF SAID ROCKING SEGMENT ELEMENTS SO THAT EVERY OTHER ONE OF SAID ROCKING SEGMENTS SIMULTANEOUSLY ROCKS IN THE OPPOSITE DIRECTION FROM ITS ADJACENT SEGMENTS TO VARY THE VOLUME AND DIRECTION OF FLUID FLOW IN SAID PUMP.