Pump or motor device

Claim 1

AN ENERGY TRANSLATING DEVICE COMPRISING: A VALVE PLATE HAVING INLET AND OUTLET PORTS THEREIN HAVING A SEATING SURFACE, A ROTATABLE CYLINDER BLOCK HAVING A PLURALITY OF CYLINDERS THEREIN AND HAVING A FACE COMMUNICATING WITH SAID CYLINDERS, SAID FACE ENGAGING SAID SEATING SURFACE AND ROTATABLE WITH RESPECT TO SAID VALVE PLATE, SAID BLOCK HAVING AN AXIAL LENGTH SUBSTANTIALLY LESS THAN ITS DIAMETRICAL WIDTH, MEANS LOCATING SAID CYLINDER BLOCK RADIALLY, PISTONS SLIDABLY MOUNTED IN SAID CYLINDERS ADAPTED TO RECEIVE AND EXPEL FLUID THROUGH SAID PASSAGES, A CAM MEMBER HAVING AN CAMMING SURFACE FOR RECIPROCATING SAID PISTONS, AND RIGID RODS PIVOTALLY CONNECTED AT ONE END TO SAID CAMMING SURFACE AND PIVOTALLY CONNECTED AT THEIR OTHER ENDS TO SAID PISTONS TO RECIPROCATE SAID PISTONS, SAID RODS BEING SUBSTANTIALLY PERPENDICULAR TO SAID CAMMING SURFACE, SAID RODS EXERTING A SIDE FORCE ON EACH OF SAID PISTONS, THE CENTROID OF THE POINTS OF PIVOTAL INTERCONNECTIONS BETWEEN SAID RODS AND SAID PISTONS LYING IN A PLANE PERPENDICULAR TO THE AXIS OF SAID CYLINDER BLOCK AND BISECTING SAID LOCATING MEANS.