Flexible frame for a multi-section implement

摘要

A flexible frame structure for an implement includes a wing frame section with several fore-and-aft spaced, transversely extending rank tubes that are connected to surrounding support structure with conventional, non-resilient pin joints for rotation about a fore-and-aft extending horizontal rank axis. A transversely extending rear rank tube is rigidly connected to a fore-and-aft extending caster wheel support frame which extends forwardly above the ends of the rank tubes. A caster wheel projects forwardly from the end of the support frame out of interfering relationship with the forward tool-carrying rank. The rear rank tube and caster wheel support frame define a rigid L-shaped member which is connected to the adjacent frame section by a conventional pin and pivot structure for rotation about a first axis corresponding to the rank axis, and a second axis perpendicular to the forward direction. A diagonal brace has a leading end pivotally connected to the surrounding support structure and a trailing outer end connected near the vertex area of the L-shaped member for pivoting about a transverse axis. The non-resilient pin joints connect the outer ends of the rank tubes to the underside of the fore-and-aft leg of the L-shaped member, and pin hole clearances allow the frame section to distort for the implement flexibility, without rotation of the rank tubes, when operating on irregular ground surfaces. Centrally located fore-and-aft links are connected between the ranks for further rank rotational resistance.