Patent ID: 7549801

Claim:
A heavy load support system, comprising: an object and a support member for supporting the object; a hydraulic oil seal mechanism for preventing leakage of hydraulic oil, which is supplied into an hydraulic pocket defined between slide surfaces respectively formed on oppositely facing sides of the object and the support member; a connection means for connecting to the hydraulic pocket a hydraulic oil supply means for supplying hydraulic oil thereto; and a hydraulic oil supply stopping means for stopping supply of hydraulic oil into the hydraulic pocket at the time when a given clearance has been created between the slide surfaces, said hydraulic oil supply stopping means including a check valve that includes a steel ball for being brought into press contact with a tapered conduit being in communication with the hydraulic pocket and having a tapered shape, in such a manner as to be able to be contacted thereto and separated therefrom a coil spring for urging the steel ball towards the tapered conduit in a press contact direction, and a push rod for pushing the steel ball in such a direction away from the tapered conduit, wherein the push rod is placed in a hydraulic oil supply passage through the hydraulic pocket, and has an upper end disposed facing the slide surface of the object and a lower end disposed facing the steel ball within the tapered conduit.