Patent ID: 6691994
Filing Date: 2004-02-17
Classification: B23Q,B25B,F15B,Y10T

Abstract:
A hydraulic lock device, comprising:a rod; a sleeve having a thin-walled portion fittable over said rod, said sleeve being elastically deformable to a smaller diameter; a casing member supporting said sleeve; an external hydraulic chamber being formed around said sleeve a rod-moving hydraulic cylinder moving said rod in a direction of an axial center thereof; an annular pressure booster, on an interior of said casing member, for pressurizing oil in said external hydraulic chamber; an input oil chamber communicating with said pressure booster; a pressurized oil feed port in said casing member for feeding pressurized oil to said rod-moving hydraulic cylinder and said input oil chamber of said pressure booster; an oil supply channel extending from said pressurized oil feed port to said input oil chamber; a throttle valve interposed in said oil supply channel; an oil discharge channel extending from said input oil chamber to said pressurized oil feed port; a nonreturn valve, in said oil discharge channel, capable of discharging pressurized oil from said input oil chamber; and said nonreturn valve being opened when pressurized oil is discharged through said pressurized oil feed port.