Abstract: A method and device for automatically adjusting the lightening of a working unit (U) of a machine by use of a hydraulic ram (57) associated with a hydropneumatic accumulator (67). Use is made of a second hydraulic ram (58) of which the piston (53), which can move as far as a predetermined position (PP) in the cylinder (C2) and which is detached from the rod (46) of the first hydraulic ram (57), acts directly or indirectly on the latter rod via the oil (O) contained in the first hydraulic ram (57). The working unit (U) is raised and lowered by the second hydraulic ram (58). When raising the working unit (U), the volume of oil in the first hydraulic ram (57) is increased or decreased in such a way that the working unit (U) is always at a predetermined height (HP) at the end of raising travel.

Abstract: A disk colter has a main disk for making a furrow in the ground. A secondary disk keeps the furrow open over a long enough distance that one or more seeds can be deposited. A support member supports the disks which are mounted so that they can rotate freely and are inclined in such a way that their peripheries meet in a region where the disks are closest to each other. This region is located at a bottom front part of the colter. On the main disk and/or the secondary disk, there is a plugging member intended to plug, at least in a vicinity of the region, a slot between the main disk and the secondary disk so that earth and/or plant debris are prevented from accumulating between the disks at least in the region.

Abstract: The invention relates to an agricultural cutting machine includes a chassis, a harvesting mechanism and a suspension device connecting the harvesting mechanism to the chassis. The suspension device includes a lower suspension member and an upper suspension member forming an articulated quadrilateral which allows the harvesting mechanism to move relative to the chassis. The geometric axis of the articulation connecting the lower suspension member to the harvesting mechanism passes through or substantially through the center of mass of the harvesting mechanism.

Abstract: A haymaking machine, especially a windrower of mown plant matter, comprisinga frameseveral windrowing rotors which are driven in rotation during work about substantially vertical axes having supports fitted with carrier wheels,the frame comprising a draft beam and a connecting beam to which at least one of the windrowing rotors is connected,the connecting beam being articulated with respect to the draft beam so that it can be moved, together with the rotor or rotors connected to it, laterally to the right and/or to the left,at least the rotor furthest from the articulation to the draft beam being flanked by a windrowing deflector which can be adjusted into several positions with respect to the rotor,the windrowing deflector is connected by means of at least one lever to a support,the support is connected to the substantially vertical axis of the rotor beside which the windrowing deflector is situated,the lever is connected to the connecting beam by means of a rod and can be moved with respect to the support t

Abstract: An agricultural machine includes a body, a connecting mechanism, an operating device for pivoting the connecting mechanism into at least two working positions, transmission elements which include at least one gearbox, and a control mechanism intended to pivot the gearbox into operating positions corresponding to the working positions of the connecting mechanism. In accordance with the invention, the control mechanism is installed, among others, between the gearbox and the operating device. This control mechanism can also include a first control cylinder installed between the connecting mechanism and the body and connected in series to a second control cylinder installed between the body and the gearbox.

Abstract: The present invention relates to an agricultural machine for harvesting plant matter including: a mobile frame; a draw bar connected to the mobile frame; a harvesting mechanism having two conditioning units, each one provided with two contra-rotating conditioning members; and transmission members intended to impart movement to the conditioning units and including a transmission box equipped with a first output shaft and with a second output shaft. The inner end of each first conditioning member is supported by the corresponding first output shaft, and a transmission device of each second conditioning member couples an end thereof to the corresponding second output shaft.

Abstract: A conditioning device for harvesting products includes a casing having an inlet and outlet section, a transport rotor, a deflector defining a passage channel, and at least one comb having teeth which enter the passage channel through a slit in the deflector. The comb is connected to the deflector so that it can be placed in at least two different positions with respect to the deflector. The deflector is also connected to the casing so as to be able to be placed in at least two different positions with respect to the transport rotor so as to alter the passage section of the passage channel. A conditioning machine and a mower conditioner also include the conditioning device described above.

Abstract: A haymaking machine having a chassis which is composed of a central section and several lateral sections which are articulated together and carry rotors. On each side of the central section four lateral sections are provided which are articulated together by axes extending in the direction of travel, the length of each first lateral section being at least equal to the distance between the support spindles of two adjacent rotors, the length of each second lateral section being substantially longer than the distance between the support spindles of the two adjacent rotors, the length of each third lateral section being substantially shorter than the distance between the support spindles of the first adjacent rotors, and the length of each fourth lateral section being at most equal to the distance between the support spindles of the two adjacent rotors.

Abstract: A cutting machine includes a cutting mechanism, an operating device and a carrying beam connected to the cutting mechanism by an articulation. The operating device includes a retractable stop which limits the upwards pivoting of the carrying beam about a longitudinal axis of the articulation when the cutting mechanism is extending in a windrowing position and which is retracted to allow the cutting mechanism to be placed in a transport position. The retractable stop is set in place and retracted automatically by a control mechanism when the cutting mechanism is brought from a work position or from the windrowing position into the transport position.

Abstract: A cutting machine which includes a hitching structure supporting, via a suspension arm, an elongated cutting mechanism connected to the suspension arm by one articulation of horizontal longitudinal axis pointing in the direction of travel during work, and a locking device intended in the transport position to lock automatically this one articulation. The locking device includes a connecting member connected on the one hand to the cutting mechanism by another articulation of geometric axis substantially parallel to the longitudinal axis of the one articulation, and on the other hand to the hitching structure by a connection allowing, in the work position, a movement of the connecting member with respect to the hitching structure, and preventing, in the transport position, a movement of the connecting member with respect to the hitching structure.

Abstract: An agricultural machine includes a body, a connecting mechanism, an operating device for pivoting the connecting mechanism into at least two working positions, transmission elements which include at least one gearbox, and a control mechanism intended to pivot the gearbox into operating positions corresponding to the working positions of the connecting mechanism. In accordance with the invention, the control mechanism is installed, among others, between the gearbox and the operating device. This control mechanism can also include a first control cylinder installed between the connecting mechanism and the body and connected in series to a second control cylinder installed between the body and the gearbox.

Abstract: A cutting machine including a cutting mechanism which can occupy at least one work position and one set-down position; a hitching structure; a carrying beam connected on the one hand to the hitching structure by a first articulation and on the other hand to the cutting mechanism by a second articulation; a lightening device including an elastically deformable element, and a locking device intended to block the first and second articulations. In the set-down position, the hitching structure and the carrying beam are held by the elastically deformable element and the first and second articulations are locked.

Abstract: The present invention relates to a shredder for plants especially including a hitching device and a casing which is open downward and which is fitted with lateral skids. This casing has at least one gearbox with a substantially vertical shaft which can be driven in rotation and which carries one or more knives at its lower end. The invention is noteworthy in that the casing is connected to the hitching device by rods which are articulated to the casing and to the hitching device by axes and in that structure which allow the casing to pivot and to move with respect to the hitching device in directions transverse to the direction of forward travel are arranged between the rods and the hitching device and/or the casing.

Abstract: A haymaking machine including at least one windrowing rotor which is articulated to a bearing structure in such a manner that it can pivot about at least one axis which is substantially horizontal and perpendicular to the direction of travel. The at least one rotor can be driven in rotation about a central spindle which is substantially vertical and which is fitted at its lower end with a support equipped with several bearing wheels at least one of which is situated behind the central spindle. The bearing wheel which is situated behind the central spindle of the rotor is connected to an arm of the support which includes a mechanism pressing the bearing wheel against the ground during windrowing work in such a way that it is constantly bearing against the ground and tends to cause the rotor to pivot downward on its front half about the articulation to the bearing structure.

Abstract: A mower includes a cutting mechanism extending, in a work position, transversely to the direction of travel during work; a hitch structure connectable to the hitch device of a motor vehicle; a carrying beam articulated on the one hand to the hitch structure by a first articulation and on the other hand to the cutting mechanism by a second articulation; a lightening device which includes an elastic element intended to lighten the cutting mechanism in the work position; a control device which includes a body connected to the hitch structure by a third articulation; a tie rod connected to one of the ends of said elastic element and sliding on the other hand in said body; a stop element limiting, at least in one direction, sliding of the tie rod with respect to the body; and a set-down member connected, in the set-down position, to the carrying beam by the stop element.

Abstract: A mower includes a linking structure designed to link the mower to a motor vehicle; a cutting mechanism with driven cutting elements that include cutting tools; and a windrowing device designed to move laterally, toward a median plane of the cutting mechanism, the product that has been cut by the cutting elements before it is dropped to the ground. The windrowing device has at least one guiding element for the cut product, located in the vicinity of one of the lateral ends of the cutting mechanism, and considering the direction of work, behind the front of the cut of the cutting mechanism. The guiding element has at least two rotors arranged crosswise to the direction of work and to the rotation axis directed upward during work. The rotors are hung to a carrying structure linked to the cutting mechanism and/or to the linking structure, and the rotors are driven in rotation by way of a driving mechanism.

Abstract: A mower including a cutting mechanism, a hitch structure, a carrying beam, and an operating device. The operating device makes it possible to bring the cutting mechanism at least into the work position and into the windrowing position. This operating device includes an operating member connected, among other things, to the cutting mechanism which includes a first lever, a second lever connected to the carrying beam and to said first lever, and a latch intended to stop the upward pivoting of the cutting mechanism when bringing into the windrowing position, and an operating element connected to said operating member and to the hitch structure.

Abstract: A mowing machine includes a harvesting mechanism which extends during mowing transversely to a working direction, and a lightening device for the harvesting mechanism which includes at least one elastically deformable member whose action can be adjusted by way of an adjustment device connected to the elastically deformable member. The elastically deformable member can include a deformable envelope which contains a gas under adjustable pressure. The adjustment device can include a supply circuit provided with at least one electrovalve or gate connected to the deformable envelope. In an alternative embodiment, the adjustment device can include at least one jack connected to a mechanical spring, and a supply circuit provided with at least one gate or electrovalve connected to the jack.

Abstract: The present invention relates to a haymaking machine including a chassis which carries several tedding and/or windrowing rotors. This chassis has lateral parts which can be folded upward for transport and/or setting down. A protection device which at least partially surrounds the rotors is connected to said chassis. This protection device includes lateral elements which can also be folded upward for transport and/or setting down.Each lateral element of the protection device includes at least one substantially straight section which is guided in such a way that it can move longitudinally in a bearing which is connected to the corresponding lateral part of the chassis so as to reduce the height of the machine in this position.

Abstract: A valve includes a distributor with four ports and two positions. In a first position, a first non-return valve allows only circulation of a fluid from the first port toward the third port, while the second port and the fourth port are directly in communication with one another. In a second position, the third port and the fourth port are directly in communication with one another, while a second non-return valve allows only circulation of fluid from the third port and the fourth port in communication toward the first port.