Patent ID: 7380391

Claim:
A mower comprising: a hitching structure configured to be connected to a motor vehicle; a cutting mechanism extending during work transversely to a direction of advance; a carrier beam connected to the hitching structure by a first pivot articulation with a horizontal axis and to the cutting mechanism by a second pivot articulation whose axis is substantially parallel to the axis of the first articulation; a maneuvering device configured to bring the cutting mechanism from a working position, in which the cutting mechanism rests at least partially on the ground, to a maneuvering position in which the cutting mechanism extends somewhat above the ground, and vice versa; a lightening device configured to transfer at least a part of the weight of the cutting mechanism onto the hitching structure, the lightening device including a first hydraulic cylinder fed with oil by at least one hydropneumatic accumulator by a first pipe, the first hydraulic cylinder configured to exert an upward torque on the cutting mechanism; wherein the maneuvering device includes a floating piston cylinder whose interior is divided into first and second chambers by a floating piston, wherein the first chamber is connected to the first hydraulic cylinder by a second pipe and the second chamber is connected to a hydraulic circuit of the motor vehicle by a third pipe, wherein said hydraulic circuit is configured to inject from the first chamber of said floating piston cylinder an additional quantity of oil into the first hydraulic cylinder of the lightening device to bring the cutting mechanism from the working position into the maneuvering position, and to, wherein said hydraulic circuit is configured to extract said additional quantity of oil from the first hydraulic cylinder into said first chamber of said floating piston cylinder so as to bring the cutting mechanism from the maneuvering position into the working position.