Patent ID: 9615498
Date: 2017-04-11
CPC Classifications: A01B,A01D

Claim:
1. A haymaking machine, comprising a chassis supported on the ground by wheels and at least one working device connected to the chassis, the chassis including a coupling device to which a first hitching piece and a second hitching piece are articulated, each of the first and second hitching pieces bearing a hitching pin for hitching to respective first and second lower arms of a tractor, wherein the first and second hitching pieces respectively cooperate with a first return device and a second return device, wherein each of the first and second return devices stores energy when the corresponding hitching pin moves, relative to the coupling device, upward from a first position, and each of the first and second return devices being able to release that energy to the corresponding hitching pin by returning the hitching pin toward the first position, and wherein each of the first and second return devices stores energy when the corresponding hitching pin moves, relative to the coupling device, downward from a second position, and each of the first and second return devices can release that energy to the corresponding hitching pin by returning the hitching pin toward the second position.