Patent ID: 7516614
Filing Date: 2009-04-14
Classification: B66F,E02F,F15B

Abstract:
1. An improved hydraulic arrangement for a spring support system, the hydraulic arrangement having a hydraulic cylinder with first and second chambers, a hydraulic reservoir, a hydraulic fluid feeder conveying hydraulic fluid, a hydraulic accumulator, a first hydraulic line disposed between the hydraulic accumulator and the first chamber, a first control valve disposed in the first hydraulic line, a second hydraulic line disposed between the second chamber and the hydraulic reservoir, a second control valve disposed in the second hydraulic line, a first supply line for the first chamber, a second supply line for the second chamber, an automatic shut-off valve disposed in the first supply line, and a controller with at least three positions, comprising a lifting position, a lowering position and a neutral position for the hydraulic cylinder, wherein the improvement comprises: a third hydraulic line provided with a non-return valve that opens in the direction of the accumulator and is disposed between the accumulator and the controller; and, a fourth hydraulic line provided with a flow-reducing means disposed between the non-return valve and the first chamber, with the third hydraulic line being connected to the first supply line between the automatic shut-off valve and the controller and the fourth hydraulic line being connected to the third hydraulic line between the non-return valve and the accumulator.