| 摘要 |
A horizontally folding implement has a pair of tool-supporting beams that project laterally outwardly from opposite sides of the central, fore-and-aft extending frame of the implement when the beams are in their widespread, working positions. A pair of vertical pivots on opposite sides of the longitudinal axis of the frame adapt the beams for horizontal swinging between such working position and a folded, transport position, while a pair of horizontal pivots adapt the beams for limited vertical swinging movement in order to accommodate variations in ground contour. A pivotal coupling between the proximal inner ends of the beams when the latter are in their working positions keeps the two inner ends at the same height relative to one another during terrain variations encountered by the ground wheels or the tools of the beams, but the coupling does not inhibit horizontal swinging of the beams between their working and transport positions.
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