| 摘要 |
An agricultural harvesting machine includes a frame section carrying a pair of ground-engaging wheels and a header section carrying a crop cutting mechanism and pivotably mounted to the frame section. An adjustable link arrangement is interposed between the frame section and the header section, for controlling the angular relationship of the header section relative to the frame section to vary the elevation of the cutting mechanism carried by the header section. The adjustable link arrangement includes a rear link connected to the frame section and a front link pivotably connected to the rear link. An adjustment assembly is interconnected with the front link at a location spaced from the connection of the front link to the rear link, and the adjustment assembly is interconnected with the header section. The front link includes a threaded receiver, and the adjustment assembly includes a threaded shaft engageable with the threaded receiver, such that turning the threaded shaft results in adjustment of the axial position of the header section relative to the front link, and thereby relative to the frame section through the rear link. The threaded shaft is interconnected with a handle assembly for facilitating rotation of the threaded shaft by a user. Guide structure is mounted to a frame member associated with the header section, and includes a pair of guide slots which receive end portions of a pivot pin which interconnects the front and rear link members. The handle assembly includes a shoulder engageable with the guide structure, such that engagement of the guide structure with the shoulder controls the position of the header section relative to the front link member, and thereby relative to the frame section.
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