| 摘要 |
A farm implement comprising: a) a carrier frame (1), b) a tool gang frame (3) disposed to the rear of and transversely aligned to said carrier frame (I) when in the field working position, c) a rockshaft (2) disposed between said carrier frame (1) and said tool gang frame (3), d) said rockshaft (2) being pivotally connected to each of said carrier frame (1) and said tool gang frame (3) about a first and a second axis of rotation respectively, said first and second axes being horizontally and transversely disposed when in the field working position, e) means (d) to selectively control the relative angular position of the said rockshaft (2) in respect of said carrier frame about said first axis i) between first and second rockshaft positions, whereby (1) said tool gang frame (3) rotates relative to said rockshaft (2) about said second axis, and (2) the front of said tool gang frame (3) is supported above the ground on said rockshaft (2) at a distance determined by the said relative angular position of said rockshaft (2), ii) and between said second and a third rockshaft position, f) further support means disposed rearwards of said axes of rotation and adapted to support the rear of said tool gang frame (3) above the ground in the field working position between said first and second positions, g) abutment means (g) adapted to selectively restrain relative rotation between said rockshaft and said tool gang frame (3) between said second and third rockshaft positions whereby said abutment means (g) is adapted to fully support said tool gang frame (3) on said rockshaft (2) upon rotation of said rockshaft (2).
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