Importance

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Abstract

A folding frame for a drawn implement such as a hay rake is disclosed. The frame includes cushion fold cylinders, a lift cylinder, and a windrow width cylinder. The lift arms actuated by the lift cylinder lift the frame wings and engage a selector valve, providing an open circuit to either the fold cylinder or the windrow width cylinder, or both. During folding, when the cylinders reach the cushion region of their stroke, the pressure in the hydraulic circuit increases, resulting in a change in the force applied to the selector valve by the lift arm. By careful adjustment, this change in pressure will adjust the selector valve so the hydraulic circuit is open to both the fold and windrow width cylinders. Consequently, the windrow width cylinders extend, keeping the frame wings from colliding with the main frame.

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First Claim