Rotary power device

Claim 1

A ROTARY HYDRAULIC POWER UNIT OF THE ROTARY ABUTMENT TYPE COMPRISING A CASING HAVING THREE ANNULAR CYLINDERS EACH HAVING AN INLET AND AN OUTLET AND A ROTOR SHAFT CARRYING A PISTON ROTOR WITH A PISTON SLIDABLY ARRANGED IN THE CYLINDER TO TRANSVERSE THE CYLINDER IN ROTARY MOVEMENT, A ROTARY ABUTMENT ARRANGED IN SAID CASING WITH ITS AXIS PARALLEL TO THE ROTOR SHAFTS, SAID ANNULAR CYINDERS BEING DISTRIBUTED AROUND SAID ABUTMENT SHAFT AND LYING IN A COMMON PLANE, SAID ABUTMENT HAVING A PAIR OF RECESSES TO CLEAR EACH OF THE THREE PISTONS AS A PASSESS THE ABUTMENT, THE PISTONS HAVING A BASE RADIUS WHICH IS ONE-HALF THE RADIUS OF THE ABUTMENT AND THE PISTON ROTORS ROTATING IN 2:1 RELATION TO THE ABUTMENT, (A) THE ABUTMENT RECESSES MESHING CLOSELY WITH THE PISTONS SO THAT THE TIPS OF THE PISTONS SUBSTANTIALLY CLOSE WITH THE EDGES OF THE ABUTMENT RECESSES AS THE PISTONS PASS THROUGH THE RECESSES, AND (B) DUCTS LEADING FROM AT LEAST ONE END OF THE ABUTMENT AT POINTS WHICH ARE IN COMMUNICATION WITH THE ABUTMENT RECESSES WHEN THE PISTONS ARE CLEARING THROUGH THE RECESSES, SAID DUCT EXTENDING INTO COMMUNICATION WITH AT LEAST ONE OF SAID INLETS AND OUTLETS OF THE CYLINDERS TO ACCOMMODATE FLOW OF LIQUID PREVENTED FROM FLOWING AROUND THE TIPS OF THE PISTONS BY THE CONSTRUCTION DEFINED IN (A) ABOVE, BY VIRTUE OF ALL OF WHICH THE HEIGHT OF THE PISTONS FOR A GIVEN SIZE OF UNIT CAN BE INCREASED WITHOUT CREATING OBJECTIONABLE PULSATION DUE TO RESTRICTION OF FLOW AROUND THE PISTON TIPS, THE INCREASED PISTON HEIGHT SO ACCOMMODATED YIELDING A HIGHER VOLUME OF LIQUID FLOW PER STROKE OF THE PISTONS.