Abstract: An implement wheel assembly includes two individual wheel arms tied together by a linkage that pivots about a fore-and-aft extending axis at a location above the wheels and generally above the plane of the implement frame. The linkage constrains the wheel arms to pivot in opposite vertical directions as the implement moves over irregular ground surfaces to improve weight distribution on the wheels. Spring structure may be interposed between the ends of a pivoting linkage and the individual wheel arms to lower frame impact forces. The structure allows two wheels to be placed side-by-side with their axes generally aligned and reduces under-frame hardware to improve crop and soil and trash flow.

Abstract: An implement wheel assembly includes two individual wheel arms tied together by a linkage that pivots about a fore-and-aft extending axis at a location above the wheels and generally above the plane of the implement frame. The linkage constrains the wheel arms to pivot in opposite vertical directions as the implement moves over irregular ground surfaces to improve weight distribution on the wheels. Spring structure may be interposed between the ends of a pivoting linkage and the individual wheel arms to lower frame impact forces. The structure allows two wheels to be placed side-by-side with their axes generally aligned and reduces under-frame hardware to improve crop and soil and trash flow.

Abstract: A vertical retainer assembly for a roll-up door that selectively blocks and unblocks a doorway, the door including a curtain attached to a roller, and vertical members disposed on either side of the doorway, which include vertically-disposed guide tracks for receiving and guiding the curtain in a vertical plane, the vertical retainer assembly compromising: a horizontally disposed member attached to the curtain, the member being movable out of the vertical plane of the door; and a retaining surface in one of the vertical members at a location external to the guide track, the horizontally disposed member being selectively engageable with this retaining surface which vertically retains the member against upward movement, and prevents the roller from being actuated to roll up the curtain.