| 摘要 |
A three point linkage for coupling a tractor or similar vehicle to a working tool includes two lower guide members and an upper guide member which is resiliently connected to the lower guide members. A catch hook is located at one end of each of the guide members for coupling to the working tool. The other end of each of the guide members is coupled to the tractor. The upper guide member is longitudinally adjustable and includes an inner guide element telescopically cooperating with a spring loaded outer guide element. A nut, carrying pivotally movable locking jaws, is slidably carried on the outer guide element for fixing the outer guide element relative to the inner guide element. The catch hook of the upper guide member is carried at the opposite end of the outer guide element from the nut. A locking slide is axially displaceable on the outer guide element for locking a coupling bolt on the working machine within the catch hook and also for displacing the sliding nut in response to its contact with the working tool. The locking slide has a first slot and the outer guide element is provided with a lug which has a second slot positioned at an angle with respect to the first slot. A cross-bar passes through both slots so that the locking slide will be displaced when the cross-bar is moved within the slots. Resilient struts connect the cross-bar with the lower guide members to achieve resilient coupling of the upper and lower guide members. Longitudinal displacement of the slide relative to the outer guide element causes displacement of the sliding nut for releasing of the locking jaws and also for opening the catch hook to receive the coupling bolt of the working tool.
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