Hartmann

Claim 1

A MANUALLY CONTROLLABLE VARIABLE SPEED HYDRAULIC DRIVE COMPRISING A HOUSING HAVING A FLUID INLET OPENING AND A FLUID OUTLET OPENING AND A CHAMBER DEFINED THEREIN, A VANE TYPE OF ROTOR ROTATABLY DISPOSED IN SAID CHAMBER AND INCLUDING SLIDING VANES, AN INPUT SHAFT CONNECTED TO SAID ROTOR AND EXTENDING INTO SAID HOUSING AND HAVING A BORE THEREIN IN FLUID-FLOW COMMUNICATION WITH SAID FLUID OUTLET OPENING, A RING ROTATABLY DISPOSED IN SAID CHAMBER AND HAVING AN INNER ARCUATE SURFACE ENCIRCLING SAID ROTOR AND BEING IN FLUID-SNUG CONTACT THEREWITH ON A PART OF SAID SURFACE AND BEING SPACED FROM SAID ROTOR AT ANOTHER PART OF SAID SURFACE TO DEFINE A WORKING CHAMBER WITH SAID ROTOR IN THE PATH OF SAID VANES, PLATES ATTACHED TO OPPOSITE SIDES OF SAID ROTOR TO ROTATE THEREWITH AND EXTENDING BEYOND THE CIRCUMFERENCE OF SAID ROTOR AND WITH ONE OF SAID PLATES HAVING FLUID PASSAGES IN ROTATIONALLY FORWARD POSITIONS FROM SAID VANES AND IN FLOW COMMUNICATION WITH SAID WORKING CHAMBER AND SAID BORE, SAID ROTOR AND SAID RING AND SAID PLATES ALL BEING RADIALLY SPACED FROM SAID HOUSING, SAID RING HAVING A FLUID PASSAGE IN FLUID-FLOW COMMUNICATION WITH BOTH SAID FLUID INLET OPENING AND SAID WORKING CHAMBER, AN OUTPUT SHAFT ROTATABLY MOUNTED IN SAID HOUSING AND CONNECTED TO SAID RING AND EXTENDING EXTERIORLY OF SAID HOUSING, AND A MANUALLY CONTROLLABLE HYDRAULIC VALVE DISPOSED IN SAID OUTLET OPENING IN THE PATH OF THE OUTLET FLOW FROM SAID HOUSING FOR REGULATING THE QUANTITY OF HYDRAULIC FLUID FLOWING THROUGH SAID WORKING CHAMBER AND THEREBY REGULATING THE SPEED OF ROTATION OF SAID OUTPUT SHAFT.