Patent ID: 7043906

Claim:
A hydraulic apparatus comprising: an operating fluid tank; a driving source inherently or additionally provided with a predetermined amount of inertia; a hydraulic pump driven by the driving source, said pump adapted to suck in the operating fluid from said tank; a first pipeline extending the discharge port of said hydraulic pump toward a load; a second pipeline branching off from said first pipeline and extending to said tank; a first open/close valve interposed in said second pipeline; and a check valve interposed in said first pipeline on a downstream side of a branching point between said first and second pipelines, said check valve adapted to flow the fluid in only one direction from said hydraulic pump toward said load, wherein pressure of the fluid is raised by said inertia and the fluid is supplied to said load when the position of said first open/close valve is repeatedly switched between a pass side and a stop side thereof.