Hydraulic pump

Claim 1

IN A HYDRAULIC PUMP, THE COMBINATION OF, A HOUSING, CYLINDRICAL CASING JOURNALED IN SAID HOUSING TO ROTATE ABOUT A FIXED AXIS, A REVERSIBLE ROTARY PUMP INCLUDING A PUMP ELEMENT DISPOSED WITHIN AND JOURNALED ON SAID CASING TO TURN ABOUT AN AXIS PARALLELING THE CASING AXIS, A SHAFT JOURNALED IN AND CONCENTRIC WITH SAID CASING AND OPERABLE TO DRIVE SAID PUMP ELEMENT SELECTIVLEY IN OPPOSITE DIRECTIONS, A PLURALITY OF CYLINDERS MOUNTED ON SAID CASING AND COMMUNICATING ALTERNATELY WITH OPPOSITE SIDES OF SAID ROTARY PUMP TO RECEIVE PRESSURE FLUID FROM THE OUTPUT SIDE OF THE PUMP IN EACH DIRECTION OF ROTATION OF THE LATTER, SAID CASING BEING FORMED WITH AN OUTLET PORT SPACED RADIALLY FROM SAID CASING AXIS AND COMMUNICATING WITH SAID CYLINDERS, A PLURALITY OF PISTONS SLIDABLY MOUNTED IN SAID CYLINDERS, MEANS FOR CONVERTING THE ROTARY MOTION OF SAID SHAFT INTO LINEAR MOTION OF SAID PISTONS RELATIVE TO SAID CYLINDERS TO PUMP SAID FLUID THROUGH SAID OUTLET PORT, THE REACTIVE FORCE OF SAID ROTARY PUMP UPON REVERSAL OF THE DIRECTION OF ROTATION OF SAID SHAFT CAUSING THE CASING TO TURN IN THE HOUSING, AND MEANS ON SAID CASING AND SAID HOUSING COACTING TO LIMIT TURNING OF SAID CASING BETWEEN TWO PREDETERMINED POSITIONS, SAID HOUSING HAVING TWO APERTURES DISPOSED ADJACENT SAID OUTLET PORT AND ALTERNATELY COMMUNICATING WITH SAID OUTLET PORT IN SAID PREDETERMINED POSITIONS OF SAID CASING WHEREBY REVERSAL OF THE DIRECTION OF ROTATION OF SAID ROTARY PUMP SHIFTS THE OUTPUT OF SAID CYLINDERS FROM ONE APERTURE TO THE OTHER.