Patent ID: 6571679
Filing Date: 2003-06-03
Classification: B27L

Abstract:
A driving mechanism for operating in a mode for moving two objects simultaneously and reciprocatingly in mutually opposite directions, said driving mechanism comprising:a pair of hydraulic cylinders individually connected to said two objects; a pump for moving a hydraulic liquid; a first valve which controls motion of said hydraulic liquid to and from said pair of hydraulic cylinders such that said two objects will move simultaneously and in mutually opposite directions; a connecting pipe which directly connects said pair of hydraulic cylinders through which said hydraulic liquid flows from one to the other of said pair of hydraulic cylinders each time said pair of hydraulic cylinders is operated to move said two objects in said mutually opposite directions; and a second valve which controls motion of said hydraulic liquid directly to and from one of said pair of hydraulic cylinders connected to said two objects without passing through the other of said pair of hydraulic cylinders.