Hydraulic drive means for dredge comprising means for the selective injection or withdrawal of pressure fluid from a motor driving circuit

Claim 1

A FLUID CONTROL SYSTEM FOR A DREDGE HAVING A LEFT SWING LINE WINCH AND RIGHT SWING LINE WINCH COMPRISING; (A) A FLUID SWING CIRCUIT, (B) A LEFT MOTOR IN SAID SWING CIRCUIT FOR DRIVING SAID LEFT WINCH, (C) A RIGHT FLUID MOTOR IN SERIES WITH SAID LEFT FLUID MOTOR IN SAID SWING CIRCUIT FOR DRIVING SAID RIGHT WINCH IN THE OPPOSITE DIRECTION FROM SAID LEFT WINCH, (D) MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID SWING CIRCUIT FOR DRIVING SAID MOTORS, (E) MEANS FOR REVERSING THE FLOW OF FLUID THROUGH SAID SWING CIRCUIT TO REVERSE THE DIRECTION OF SAID MOTORS, (F) A CONTROL CIRCUIT INCLUDING FIRST AND SECOND BRANCH CIRCUITS, (G) SAID FIRST BRANCH CIRCUIT COMMUNICATING WITH SAID SWING CIRCUIT BETWEEN SAID MOTORS, (H) SAID SECOND BRANCH CIRCUIT COMMUNICATING WITH SAID SWING CIRCUIT ON THE OPPOSITE SIDE OF ONE OF SAID CONTROL CIRCUIT, AND (I) MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID CONTROL CIRCUIT, AND (J) VALVE MEANS FOR SELECTIVELY DIVERTING SAID SUPPLY FLUID IN SAID CONTROL CIRCUIT TO SAID FIRST BRANCH CIRCUIT OR TO SAID SECOND BRANCH CIRCUIT.