Hydraulic cylinder with fast-acting means

Claim 1

A FLUID ACTUATED POWER UNIT COMPRISING A CYLINDER HAVING TWO AXIALLY SPACED AND AXIALLY EXTENDED BORES IN FLUID-FLOW COMMUNICATION AND OF DIFFERENT CROSS-SECTIONAL SIZES TO PRESENT A SMALLER BORE AND A LARGER BORE, A PISTON AXIALLY SLIDABLY DISPOSED IN EACH OF SAID BORES AND BEING FLUID TIGHT THEREIN AND CONNECTED TOGETHER TO SLIDE AXIALLY WITH EACH OTHER AND PROVIDE A STROKE, A PISTON ROD CONNECTED TO SAID PISTONS AND EXTENDING EXTERNALLY OF SAID CYLINDER AND BEING MOVABLE IN ACCORD WITH THE SLIDING MOVEMENT OF SAID PISTONS, SAID CYLINDER HAVING A FLUID PASSAGEWAY IN FLUID-FLOW COMMUNICATION WITH SAID SMALLER BORE AND AT A LOCATION TO THE OPPOSITE AXIAL SIDE OF SAID PISTON THEREIN WITH RESPECT TO SAID LARGER BORE, THE AXIAL EXTENT OF SAID LARGER BORE BEING GREATER THAN THE AXIAL EXTENT OF SAID SMALLER BORE, SAID PISTON IN SAID SMALLER BORE BEING FLUID TIGHT THEREIN AND BEING AXIALLY MOVABLE TO ONE POSITION AND ADAPTED TO BLOCK FLUID FLOW TOWARD SAID LARGER BORE AND BEING AXIALLY MOVABLE TO ANOTHER POSITION AND ADAPTED FOR THE PASSAGE OF FLUID FROM SAID LARGER BORE, AND SAID PISTON IN SAID SMALLER BORE BEING SUPPORTED AND PILOTED BY THE OTHER SAID PISTON AND BEING MOVABLE OUT OF SAID SMALLER BORE WITH THE MOVEMENT OF SAID PISTON IN SAID LARGER BORE SO THAT FLUID FROM SAID FLUID PASSAGEWAY CAN FLOW INTO SAID LARGER BORE.