Patent ID: 6385969
Filing Date: 2002-05-14
Classification: F15B

Abstract:
An apparatus for moving a movable component relative to a vehicle, said apparatus comprising a double-action hydraulic working cylinder which is connectable to said vehicle and said component, said working cylinder defining a piston chamber and a rod chamber,a hydraulic accumulator connected to said working cylinder to supply hydraulic fluid to said piston chamber thereof, a hydraulic storage tank, a first hydraulic line connected between said hydraulic storage tank and said rod chamber of said working cylinder, said first hydraulic line including a pump and a first check valve which allows hydraulic fluid flow through said pump only in a direction to said rod chamber, and a second hydraulic line connected between said hydraulic storage tank and said first hydraulic line between said check valve and said rod chamber, said second hydraulic line including an electrically-controllable proportional pressure valve to enable hydraulic fluid to flow from said rod chamber to said hydraulic storage tank.