| 摘要 |
A lower hook for three-point linkages, in particular for the coupling of an implement to agricultural machinery, comprises a main body including a hook-shaped portion (3) which defines a recess for the housing of a coupling sphere (4) of an implement. The hook also comprises a blocking device (6) positioned inside the main body, from which it can protrude selectively to lock the coupling sphere (4) in an extracted position. The blocking device can be activated by means of a control lever (14) hinged to a lever element (10), which is coupled to the blocking device by means of a peg-slot link (11, 12). A resilient member (20) exerts a return action on the lever element (10) to return the blocking device (6) from the retracted position to the extracted position. A shaped portion (18) of the control lever (14) is adapted to interfere with a corresponding shaped portion (19) of the main body to lock the blocking device in the open position. <IMAGE> |
