Patent ID: 9732500
Date: 2017-08-15
CPC Classifications: E02F,F15B

Claim:
1. A hydraulic cushion circuit comprising: a bi-directional hydraulic cylinder; a directional control valve; first and second cylinder conduits individually connected to the directional control valve and the hydraulic cylinder; a pump; a sump; a first conduit connected to the first cylinder conduit and a second conduit connected to the second cylinder conduit; a first one way check valve in the second conduit oriented to prevent flow from the second cylinder conduit; a second one way check valve in the first conduit oriented to prevent flow from the first cylinder conduit; a cushion valve connected to the first cylinder conduit by the first conduit and an outlet conduit, and connected to the second cylinder conduit by the second conduit and the outlet conduit, the cushion valve being operative to selectively move to a first open position to connect the second cylinder conduit to the outlet conduit, move to a second open position to connect the first cylinder conduit to the outlet conduit, or move to a closed position to prevent flow through the cushion valve; a flow restrictor provided in the outlet conduit; and wherein the cushion valve moves to one of the first and second open positions when the fluid flow supplied by the pump through the directional control valve to the cylinder is greater than a predetermined flow value.