| 摘要 |
<p>A coupling device at a tractor is described, provided with a three-points fastening for tools, with an upper top beam, with a 1:st substantially horizontally displaceable fastening link, and two lower traction beams, with 2:nd and 3:rd substantially vertically displaceable fastening links, and a power output in the form of a substantially horizontally rotating shaft, directed in the longitudinal direction of the tractor. It comprises a first coupling frame, fastened hinged (6, 7, 8) at said 1:st to 3:rd fastening links, and a second coupling frame, provided with at least an upper (25) and two lower (26, 27) fastening links for hinged fastening of a tool, the first coupling frame being provided with a first coupling element (16) in longitudinal- and direction variable rotation connection with said rotating shaft of the tractor, the second coupling frame being provided with a second coupling element (28) being able to be connected to rotation connection with the first coupling element, to transfer the effect of said rotating shaft to the tool, the coupling frames being provided with cooperating upper and lower fastening elements. The coupling device is primarily characterized in that the upper fastening element of the first coupling frame consists of two fastening hooks (9, 10), turned from the tractor, provided at a distance from each other symmetrically from the vertical symmetric axis of the coupling frame, converging upwards towards each other, and that the second coupling frame comprises an upper beam element (20) in each end limited by downwardly directed limiting elements (21, 22). The fastening hooks and the beam element are formed and provided in such a way, that the fastening hooks can be brought, from below, to vertically and horizontally correct coupling with the horizontal beam element, also when the first and second coupling frames are somewhat mutually twisted in a plane perpendicular to the longitudinal direction of the tractor.</p> |
