Patent ID: 7748215
Filing Date: 2010-07-06
Classification: F15B,F16D,F16H

Abstract:
1. In a manifold for hydraulically coupling a reversible source of hydraulic power for reversibly circulating hydraulic liquid for driving coupled, dual motor, reversible hydraulic drive of a winding and unwinding system, having: (i) two hydraulic input/output (I/O) chambers each hydraulically coupled to receive input liquid from the reversible source of hydraulic power, and each hydraulically coupled for providing liquid input to and receiving liquid output from one reversible hydraulic motor; (ii) a tubular bypass cavity hydraulically coupled to receive liquid from and provide liquid to both reversible hydraulic motors; (iii) a translation passageway having an opening into each input/output (I/O) chamber hydraulically establishing communication between each chamber and the tubular bypass cavity; (iv) a ball within each input/output (I/O) chamber settable upon a valve seat annularly surrounding the opening of the translation passageway for isolating the tubular bypass cavity from hydraulic liquid input from the reversible source of hydraulic power and for directing that liquid to the particular reversible hydraulic motor coupled to that chamber to rotate its actuator; and (v) a shuttle rod translating in the translation passageway having a cross section for permitting liquid to flow though the translation passageway and having a length longer than the translation passage for preventing the respective balls in the input/output (I/O) chambers from simultaneously seating upon the valve seats in the respective input/output (I/O) chambers; an improvement comprising in combination therewith: (vi) a stop within each input/output (I/O) chamber confining the ball within each chamber in a region between the valve seat annularly surrounding the opening of the translation passageway and all hydraulic couplings allowing the chamber to receive liquid from the reversible source of hydraulic power and to provide and receive liquid from one reversible hydraulic motor.