HAYMAKING MACHINE WITH A COUPLING DEVICE COMPRISING AN IMPROVED RETURN DEVICE Russian patent published in 2018 - IPC A01D67/00 A01B59/06 

FIELD: agriculture.

SUBSTANCE: invention relates to haymaking machine. Haymaking machine comprises chassis directly or indirectly supported by wheels and at least one working device linked to the chassis. Chassis comprises coupling device (4) to which two coupling parts (18a, 18b) are hinged, each carrying pin (17a, 17b) for coupling to the respective lower arms of tractor. Each coupling part (18a, 18b) is engaged with corresponding return device (21a, 21b). Each return device (21a, 21b) is designed to store energy, when corresponding pin (17a, 17b) moves relative to coupling device (4) upwards from the first position, and each return device (21a, 21b) is configured to give this energy to corresponding pin (17a, 17b) by returning this pin (17a, 17b) to the first position. Each return device (21a, 21b) is designed to store energy, when corresponding pin (17a, 17b) moves relative to coupling device (4) upwards from the second position, and each return device (21a, 21b) is configured to give this energy to corresponding pin (17a, 17b) by returning this pin (17a, 17b) to the second position.

EFFECT: achieved technical result consists in increasing the comfort of driving machine, service life of the machine and its stability when moving, which, in turn, improves the quality of performance at increased speeds.

19 cl, 4 dwg