| 摘要 |
Towable tractor tool supported by ground engaging wheels (2), runners or the like and which is fastened to a tractor via a pull member (3) which is pivotably fastened to a frame (1) in a pivot (4), and wherein harrow segments (6, 7, 12, 13) are turnably fastened to the frame (1) by means of hinged links (19, 20, 21, 22) and provided to be turned in a generally horisontal plane by means of slides (10, 16) which are provided to be moved along a boom (11) by means of hydraulic cylinders (17, 18). When the slides (10, 16) prior to road transport are displaced towards the centre of the boom (11), the harrow segments (6, 7, 12, 13) are turned relative to the frame (1) so that the longitudinal axis of the harrow segments will become parallel or almost parallel with the longitudinal axis of the frame (1). One end of the harrow segments (6, 7, 12, 13) also is drawn towards a position between the ground engaging wheels (2), so that the total length of the tractor tool is reduced. The ground engaging wheels (2) are secured to levers (26) which are fastened to the frame (1) and provided to be turned about an axis of rotation (27) by means of a hydraulic cylinder (23), wherein the working depth of the tractor tool can be adjusted. The cylinder (23) also can raise the tractor tool to transport position. When the working depth is adjusted by raising or lowering the ground engaging wheels (2), the pull member at the same time is turned about the said pivot (4) by strut connected with the cylinder (23), wherein the angle of the frame (1) relative to the ground is influenced. <IMAGE> |
