Patent ID: 9144198
Filing Date: 2015-09-29
Classification: A01B,A01D

Abstract:
1. A harvesting machine comprising: a frame with a lateral upright; a pivot which is articulated on the lateral upright, the pivot including a wheel; a first hydraulic jack connected to the lateral upright and to the pivot, the first hydraulic jack including a first piston which divides an interior of the first hydraulic jack into a first chamber and a second chamber containing oil; a harvesting mechanism including cutting members; a suspension device linking the harvesting mechanism to the frame and allowing a vertical displacement of the harvesting mechanism with respect to the frame; and a lightening device of the harvesting mechanism, wherein the lightening device includes a second hydraulic jack articulated on the frame and on at least one of the harvesting mechanism or the suspension device, wherein the second hydraulic jack includes a second piston which closes a third chamber containing oil, wherein the third chamber of the second hydraulic jack is connected by a first hydraulic circuit to the second chamber of the first hydraulic jack such that the second hydraulic jack is able to be actuated by the first hydraulic jack, wherein a hydropneumatic accumulator is arranged on the first hydraulic circuit which connects the second chamber of the first hydraulic jack to the third chamber of the second hydraulic jack, wherein the first hydraulic circuit is connected to a second hydraulic circuit and the second hydraulic circuit is connected to a control device, wherein the first chamber of the first hydraulic jack is connected by a third hydraulic circuit to the control device, wherein the second and third hydraulic circuits are separate and can be controlled separately by the control device, and wherein, in a work position of the harvesting mechanism, the first chamber of the first hydraulic jack is substantially emptied of oil and the second chamber of the first hydraulic jack fills with oil originating from the third chamber of the second hydraulic jack, and, in a transport position of the harvesting mechanism, oil is injected into the first chamber of the first hydraulic jack and oil is pushed from the second chamber of the first hydraulic jack to the third chamber of the second hydraulic jack.