Abstract: A haymaking machine includes a chassis supported directly or indirectly on the ground by wheels and a working device connected to the chassis. The chassis includes a coupling device to which two hitching pieces are articulated each bearing a hitching pin for the hitching to the respective lower arms of a tractor. Each hitching piece cooperates with a respective return device. Each return device storing energy when the corresponding hitching pin moves, relative to the coupling device, upward from a first position. Each return device is able to release that energy to the corresponding hitching pin by returning the hitching pin toward the first position. Each return device stores energy when the corresponding hitching pin moves, relative to the coupling device, downward from a second position, and each return device can release that energy to the corresponding hitching pin by returning the hitching pin toward the second position.

Abstract: A haymaking machine includes a chassis supported directly or indirectly on the ground by wheels and a working device connected to the chassis. The chassis includes a coupling device to which two hitching pieces are articulated each bearing a hitching pin for the hitching to the respective lower arms of a tractor. Each hitching piece cooperates with a respective return device. Each return device storing energy when the corresponding hitching pin moves, relative to the coupling device, upward from a first position. Each return device is able to release that energy to the corresponding hitching pin by returning the hitching pin toward the first position. Each return device stores energy when the corresponding hitching pin moves, relative to the coupling device, downward from a second position, and each return device can release that energy to the corresponding hitching pin by returning the hitching pin toward the second position.

Abstract: The present invention relates to a harvesting machine with an arm comprising a first part articulated to a chassis and a second part connected to the first part and carrying a work tool, with first and second devices used for adjusting a distance between the work tool and the chassis, between minimum and maximum values, and for displacing the work tool vertically between a work position and a raised position above the ground, and with servo-control means for positioning at least one of these first and second devices in accordance with a control setpoint which determines a target height of the work tool relative to the ground. According to the invention, the servo-control means makes it possible to raise the work tool to a height substantially equal to this target height, from two transverse positions located at a distance from the chassis between the minimum and maximum values.