Patent ID: 6053419
Filing Date: 2000-04-25
Classification: A01M

Abstract:
A self-adjusting velocity damping system for a structure having at least two relatively movable parts, the damping system comprising:a) a hydraulic actuator hydraulically connected to a source of hydraulic fluid via a hydraulic supply line and mechanically connected between a first part and a second part of the structure for moving the first part with respect to the second part in response to a change in the supply of hydraulic fluid;b) a hydraulic relief valve assembly having an inlet and an outlet, with the inlet connected to a first hydraulic supply line and having a first hydraulic relief valve responsive to an overpressure condition in the hydraulic actuator and operative to divert hydraulic fluid from the first hydraulic supply line and the actuator when the pressure at the inlet is in excess of a predetermined desired cracking pressure; andc) a flow restricting orifice connected to the outlet of the first hydraulic relief valve and operative to increase the pressure at the inlet of the first hydraulic relief valve when increased hydraulic flow exists simultaneously with hydraulic pressure in excess of the desired cracking pressuresuch that excessive velocity between the first and second parts of the structure is retarded by the orifice acting to raise the inlet pressure of the first hydraulic relief valve in response to increased hydraulic fluid flow.