FR2791863A1 - Stabilising mechanism for lifting arms of tractor comprises transverse member with attachment points for machine and further attachments and bearings including direct connecting rods for lower coupling bars. - Google Patents

Abstract

The mechanism has a transverse member (10) which extends between two lower coupling bars (1,2) and carries two first attachment points (11,12) for a machine. Second attachment points (13,14) are provided for the bearings (4,5) of the lower coupling bars. Connecting rods (15,16) are provided for direct attachment to the lower coupling bars.

Description

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Description

  The present invention relates to a stabilization mechanism of a lifting device of a tractor which comprises two lower drawbars with members for attaching a machine, which bars are articulated on axes of the tractor and are movable in height around said axes by means of connecting rods. These lower drawbars constitute in combination with an upper bar a three-point coupling system. Such systems are used for coupling various machines used

  for example in agriculture, forestry or roadside maintenance.

  However, when the machine which is coupled to the lifting device comprises a tool which is offset laterally relative to the median axis of the device or which moves to the sides during work, said device can be destabilized. One of the lower drawbars can then move

  in height and tilt the whole machine towards the side on which the tool is located.

  Such displacements can deteriorate the entire lifting device or even

  destabilize the tractor when it is on sloping ground.

  To remedy this, it has already been proposed to block the lower drawbars relative to the tractor by means of props or tie rods. In this case, the entire lifting device is immobilized. It is no longer possible to raise or lower the machine with the lifting device, which can be

  detrimental to the performance and quality of the work performed.

  The object of the present invention is to propose a mechanism for stabilizing the lifting device of a tractor which does not have the aforementioned drawbacks. To this end, an important characteristic of the invention consists in that the mechanism consists of a crosspiece which extends between the two lower drawbars and which comprises first attachment points for a machine, second attachment points for coupling it to the attachment members of the lower drawbars and means for fixing it directly to said lower drawbars, at locations between the

two ends of these.

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  This mechanism stabilizes the lifting device thanks to the connection between the two lower drawbars and its double fixing on each of these bars. It is thus possible to hang machines there with tools offset laterally. Furthermore, the mechanism according to the invention does not immobilize the lifting device. The two lower drawbars can be raised or lowered by

according to needs.

  Said mechanism is also simple to make and easy to use on different

types of tractors.

  Other characteristics and advantages of the invention will emerge from the

  description which follows and which refers to the appended drawings which represent, at

  by way of nonlimiting example, an embodiment of the mechanism according to the invention. In these drawings - Figure 1 shows a perspective view of the mechanism according to the invention, - Figure 2 shows said mechanism mounted on the drawbars

lower parts of a tractor.

  As shown in Figures 1 and 2, the mechanism according to the invention is intended to be fixed on the lower drawbars (1 and 2) of a tractor. These bars (1 and 2) are articulated on horizontal axes (3) of the tractor and comprise at their opposite ends hooking members (4 and 5) such as hooks. They can be raised or lowered by means of connecting rods (6 and 7)

  of the tractor. These are articulated on the bars (1 and 2) with axes (8 and 9).

  The mechanism consists of a beam-shaped crosspiece (10) whose length roughly corresponds to the spacing between the attachment members (4 and) of the lower drawbars (1 and 2). This crosspiece (10) has first attachment points (11 and 12) for a machine, second attachment points (13 and 14) for coupling it to the attachment members (4 and 5) of the bars. lower coupling (1 and 2) and means (15 and 16) for fixing it directly to said lower coupling bars (I and 2). Near each of its ends, the crosspiece (10) has legs (17 and 18) substantially vertical

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  which are directed upwards. These legs (17 and 18) have V-shaped notches (19 and) which are open towards the rear. These notches (19 and 20) of the wolf mouth type receive the lower tenons of the carrying machine. They constitute the first attachment points (11 and 12) mentioned above. These attachment points (11 and 12) can also be made so that they link the

  mechanism cannot be dismantled by machine.

  The tabs (17 and 18) also have pins (21 and 22) for coupling to the attachment members (4 and 5) of the lower drawbars (1 and 2). These axes (21 and 22) are located under the notches (19 and 20). The lifting height of the machine from the ground is therefore greater than that of the

hooking members (4 and 5).

  The crosspiece (10) has in addition near the legs (17 and 18), arms (23 and 24) which form practically right angles to it. These arms (23 and 24) are directed horizontally towards the tractor. They carry the means (15 and 16) serving to fix the cross-member (10) to the lower drawbars (1 and 2) at locations situated between the two ends of the latter, preferably at equal distances from these ends. . These means (15 and 16) are constituted by threaded rods (25 and 26), flanges (27 and 28) and clamping nuts (29 and 30). Each of said arms (23 and 24) has a substantially horizontal axis (31 and 32) on which the threaded rods (25 and 26) are articulated in pairs. These are movable longitudinally on these axes (31 and 32) so as to be able to modify their spacing in order to adapt it to the width of the lower drawbars (1 and 2). The arms (23 and 24) have at least two holes (33 and 34) for the axes

  (31 and 32) so that these can be moved to different positions.

  The flanges (27 and 28) have two holes (35 and 36) for the passage of the threaded rods (25 and 26). At least one of these holes (34 and 36) is oblong. Therefore, these flanges can be used even if the threaded rods (25 and 26) are moved

  lengthwise on the axes (31 and 32).

  When the mechanism is fixed to the lower drawbars (1 and 2) of the tractor, the hooking members (4 and 5) are coupled to the axes (21 and 22) of the legs (17 and 18) of the crossmember (10 ). The axes (31 and 32) which carry the threaded rods (25 and 26) are located under said drawbars (1 and 2). The stems

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  threaded (25 and 26) are brought on either side of these drawbars (1 and 2) and are fixed on these by means of flanges (27 and 28) and nuts (29 and 30) ( see figure 2). Being able to move the axes (31 and 32) with the threaded rods (25 and 26) in different positions on the arms (23 and 24) avoids the connecting rods (6 and 7). The machine to be moved with the tractor can then be hooked in the notches (19 and 20) of the legs (17 and 18) of the cross-member (10) and on an upper drawbar usually used for three-point hitches. The double attachment of the mechanism according to the invention to the lower drawbars (1 and 2) provides good stability to the latter. The risk of the machine tipping over is practically eliminated. The lower drawbars (1 and 2) can be raised or lowered to bring the machine to the

good height during work.

  It is obvious that the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications remain possible, in particular as regards the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection.

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Claims (11)

Claims   1. Stabilization mechanism of a lifting device of a tractor, this device comprising two lower drawbars with members for attaching a machine, which bars are articulated on axes of the tractor and are movable in height around said axes by means of connecting rods, characterized in that it consists of a crosspiece (10) which extends between the two lower drawbars (1 and 2) and which comprises first points of attachment (11 and 12) for a machine, second attachment points (13 and 14) for coupling it to the attachment members (4 and 5) of the lower drawbars (1 and 2) and means ( 15 and 16) to fix it directly to said lower drawbars (1 and 2). 2. Mechanism according to claim 1, characterized in that the crosspiece (10) has near its ends legs (17 and 18) with notches   (19 and 20) constituting the attachment points (11 and 12) for a machine.   3. Machine according to claim 2, characterized in that the lugs (17 and 18) of the crosspiece (10) have pins (21 and 22) for coupling   to the attachment members (4 and 5) of the lower drawbars (1 and 2).   4. Mechanism according to claim 3, characterized by the fact that on the legs (17 and 18) of the crosspiece (10), the coupling pins (21 and 22) are located in below the notches (19 and 20).   5. Mechanism according to any one of the preceding claims,   characterized by the fact that the means (15 and 16) for fixing the cross-member (10) to the lower drawbars (1 and 2) consist of flanges (27 and 28) each cooperating with two threaded rods (25 and 26 ) which are connected to the crosspiece (10). 6 2791863   6. Mechanism according to claim 5, characterized in that the crosspiece (10) comprises two arms (23 and 24) which form practically angles   right with it and which are located near the legs (17 and 18).   7. Mechanism according to claim 6, characterized in that the arms (23 and 24) carry axes (3 let 32) on which the threaded rods are articulated   (25 and 26) fixing means (15 and 16).   8. Mechanism according to claim 7, characterized in that the pins (31 and 32) are located under the lower drawbars (1 and 2) when it is   mounted on said drawbars (1 and 2).   9. Mechanism according to claim 7 or 8, characterized in that the threaded rods (25 and 26) are movable on the axes (31 and 32) so as to be able to change their spacing.   10. Mechanism according to any one of claims 7 to 9, characterized by   the fact that the axes (31 and 32) are movable in at least two positions on the arms (23 and 24).   11. Mechanism according to claim 5, characterized in that the flanges (27 and 28) comprise at least one oblong hole (35 and 36) for the passage of threaded rods (25 and 26).