| 摘要 |
A vertically elongated mount is provided and supported from a tractor vehicle of the cab over engine type closely behind and spaced slightly inwardly of the front wheel of the tractor on the driver's side thereof. An elongated support arm is provided and has a first end portion pivotally supported from the lower end portion of the mount for angular displacement of the arm about a horizontal axis extending transversely of the arm and in a front to rear direction relative to the tractor. The arm is swingable between a lowered generally horizontally position with the second end portion of the arm projecting horizontally outwardly from the mount behind and slightly outwardly of the outer side of the wheel and a raised position with the second end portion of the arm projecting upwardly and outwardly from the mount to a position generally horizontally aligned with the upper periphery of the wheel and recessed slightly inwardly of the outer side thereof, and an extendible and retractable fluid cylinder is provided and has one end pivotally attached to the upper end portion of the mount and the other end pivotally anchored to the arm intermediate with the first and second end portions thereof. The cylinder is operative, upon extension and retraction thereof, to swing the arm between its lowered and raised positions.
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