Patent ID: 7204319

Claim:
Rockshaft structure for a lift system of a multi-section implement adapted for movement in a forward direction over the ground, the rockshaft structure comprising: an elongated rockshaft including a first rockshaft segment and a second rockshaft segment; a flexible joint connecting ends of the first and second rockshaft segments, the flexible joint facilitating pivotal movement of the implement sections relative to each other from an extended field working position wherein the rockshaft segments lie generally along a rockshaft axis extending transverse to the forward direction, to a folded transport position wherein the rockshaft segments are angled relative to each other, the flexible joint constraining the first and second rockshaft sections for rotation together generally about the rockshaft axis when the frame sections are in the field-working position; and wherein the flexible joint includes adjustment structure for selectively rotating the first rockshaft segment relative to the second rockshaft segment generally about the rockshaft axis and changing the relative angular position of the first rockshaft segment and the second rockshaft segment when the implement sections are in the extended field-working position.