FR2697129A1 - Connecting device for the drawbar of a towed element. - Google Patents

Abstract

Conventional connection devices for connecting towed equipment to a towing vehicle, either cannot be detached from the equipment, or can only be assembled to the latter at the cost of great effort, or are suitable for transporting the machine. equipment, and not simultaneously for its operation. The invention provides a connecting device (10) having a frame (16) which can be connected to a three-point equipment hitch (20) of a towing vehicle (12), with a first part of a coupling on it. a forearm (18) of said frame and a second coupling part (34) on a drawbar (30) of the equipment (14). The two coupling parts can be, by a vertical movement, brought into a mutual pivotal engagement. Such a connection device (10) can in particular be used for mowers or mowers for agricultural use.

Description

The present invention relates to a connection device

  for the drawbar of a towed equipment in operation, in particular for a mower, with a frame hinged to a three-point equipment coupling of a towing vehicle and at the rear end of which is a first part of a mating, while the second

  part of this coupling is mounted on the underside of the drawbar.

  Connecting devices are used to realize

  a link between a towing vehicle, for example an agricultural tractor

  and a vehicle to be towed, for example a wheeled mower Such connecting devices are usually designed

  so that it can be detached, particularly rapidly, from

  tractor than towed equipment.

  Document DE-A-29 28 524 thus describes a support frame, which is connected to the three-point hitch of an agricultural tractor and

  has a forearm with a mating jaw, in the-

  which coupling ring of a trailer can be received and stopped

  by means of a pin The forearm is designed so that it can

  connect the trailer when a forage harvester is mounted on the carrier For travel on the road network, the

  The forage harvester itself can be connected to the jaw.

  This device has the disadvantage that it does not provide any possibility of connection of the forage harvester during

  exploitation, and that the operator must leave the tractor to

string the trailer.

  Furthermore, EP-A 1-0 196 426 discloses a provision

  connecting device for a mower having, at the front end of the drawbar, a vertical hinge in which a pivot of a carrier block is pivotably engaged, which is connected to a tractor

  agricultural through two swing arms.

  In this device, the carrier block can not be separated

towed equipment.

  Finally, DE-AI-39 30 080 describes a carrier block,

  connected to the three-point equipment coupling of an agricultural tractor

  with a forearm, at the end of which extends a spherical pin, directed upwards, which can be

  introduced into a spherical bowl, open downwards,

  This ball link is only used to allow transportation

  easier, since it can now be towed long

  gitudinalement; on the other hand, during field operation, the drill is directly connected to the three-piece

points of the tractor.

  The present invention aims to provide a connection device for quick connection of the equipment to a towing vehicle and leaving the equipment, especially during its operation on the field, enough freedom for it to move so much in the transverse direction in the longitudinal direction. According to the invention, this object is achieved by the fact that the two coupling parts can be brought into mutual engagement by a vertical movement and are configured and arranged such that they allow a movement of inflection and torsion between

  the frame and the drawbar According to additional configurations advantage-

  of the solution proposed by the invention: a forearm extends

  from the frame towards the equipment, forearm in the re

  terminal terminal cantilever of which is said first coupling part; the frame is connected in mobility to the towing vehicle by means of two lower swingarms and an arm

  oscillating upper, a cross, constituting or carrying the front

  arm, extending between the connection points of the lower swingarms; said first coupling part is in the form of a ball, having a receiving opening and mounted in

  mobility in the frame or in his forearm; the second part

  coupling is made in the form of a pivot, rigidly

  attached to the drawbar and intended to be received in the receiving opening pre-

  cited; the second part has a self-locking device

  blocking, against which said first part can be brought axially

  in application; finally, the second part can be mounted in

  different positions on the drawbar.

  According to the invention, the equipment can therefore be connected by lifting the frame and by mutually engaging the two parts of the coupling. The equipment and the towing vehicle can be permanently adapted to the irregularities. of the ground, since the coupling allows pivoting movement in the horizontal plane, in a plane transverse to the direction of

  and in the vertical longitudinal median plane Despite the

  If there is a PTO shaft, it is possible to obtain a

tit turning circle.

  The use of a forearm, that is to say a cantilevered element, avoids a collision between the drawbar and the frame even when

  a tight turn With the forearm, there is a horizontal distance

  between the vertical axis of the first coupling part and

  the connection points of the lower swingarms on the frame.

  The use of a ball containing an aperture

  trice for a pivot and mounted in mobility in the frame or the forearm allows, on the one hand, a reliable assembly of the two coupling parts and, on the other hand, a great freedom of movement between

  the equipment and the towing vehicle.

  The use on the pivot of a self-locking locking device has the advantage that following a connection of the

  drawbar, this assembly can no longer be undone until

  locking the locking device, which could be ef-

  made by means of a Bowden cable, a motor or the like.

  The possibility of mounting the pivot in different places of the

  drawbar, makes it possible to arrange this pivot so that its median vertical axis

  cal, which simultaneously constitutes the pivot axis, is always

  days substantially above the longitudinal middle of the tree of

transmission used.

  The following description describes in more detail an example of

  embodiment of the invention which is shown in the accompanying drawings, in which: FIG. 1 is a side view of a connecting device and

  FIG. 2 is a view from above, in schematic

  tick, of the connecting device.

  According to FIG. 1, a connection device 10 makes a connection between a tractor vehicle 12 and a mobile equipment

towed 14.

  The connecting device 10 consists essentially of a frame 16, at the rear end of which is a

forearm 18.

  The towing vehicle 12, made in the form of a trac-

  The agricultural tractor, of a vehicle working machine or the like, has in its rear region a three-point equipment hitch 20, with lower oscillating arms 22 and an upper oscillating arm 24 A PTO shaft 26, on which can be fitted a transmission shaft 28, extends rearwardly in the space between these oscillating arms 22, 24 The equipment hitch 20 is designed conventionally and therefore height-adjustable In a manner

  also known, the PTO shaft 26 and the transmission shaft

  The traction vehicle 12 is used, inter alia, for operation, to pull the equipment 14 on the field, for example, for example from the power supply unit 28.

  to mow fodder While moving on the field, the

  tractor 12 and equipment 14 follow the irregularities

  from the ground and thus keep moving away from an optimal horizontal position.

  The equipment 14, which could be for example a fault

  heuse, a forage harvester, a press, a handset equipped with work tools, and other similar equipment, is supported on the ground by unrepresented wheels and is towed by means of a drawbar, which makes a connection with the tractor vehicle 12 by

  via the connecting device 10 according to the invention.

  The assembly of the drawbar 30 to the frame 16 is effected by means of a coupling comprising a first part and a second part.

  34 The second part 34 of the coupling, carried out in the form of

  vot, is fixed on the underside of the drawbar 30 in the front region of the latter, via a bracket 32, while a bearing 36 for a drive shaft 38 is fixed on the underside of the drawbar 30 a short distance behind the console 32 The console 32

  engages in a removable manner on the underside of the drawbar 30, by means of

  penetrating holes of a multiplicity of drillings practically

  in the drawbar 30, the arrangement of the holes

  place the console 32 in a predetermined range along the longitudinal axis of the drawbar 30. While the console 32 has essentially the shape of a plate-like base and is applied against the underside of the drawbar, the second part of Coupling 34 extends, in the form of a round pivot, downwards from this bracket 32 The second part 34 can be screwed into the console 32 so much that it is made in one piece with

  the latter At some distance from the point of connection between the

  part 34 and the console 32, a radial bore 40 is practiced

  in the second part 34: it serves to receive a non-representative esse

  tee or other similar stop pin A vertical axis passing through

  the longitudinal median axis of the second part 34 constitutes simultaneously

  the axis of pivoting of the equipment 14 around the device of

connection 10.

  The frame 16 consists essentially of a cross member 42 and two cheeks 44 symmetrically arranged, which are welded at their base end to the crossbar 32, extend upwardly from the crossbar forming a triangle and have, in their head region, a bore 46 for assembly to the upper swing arm 24 The forearm 18, which is also welded at both ends to

  cheeks 44, extends cantilevered, tongue-shaped, parallel-

  crossbar 42 at the rear of the latter.

  The forearm 18 extends essentially in a horizontal plane

  zontal and essentially maintains this position during the

  vertical elements of the three-point equipment coupling 20 The first

  first part of the coupling is received in mobility, but in a

  perdable, in the middle region of the forearm 18 She presents herself

  in the form of a ball provided with a central receiving opening.

  The inside diameter of this receiving opening is slightly

  less than the outside diameter of the second coupling portion 34,

  so that the latter can be received in the opening.

  the second part 34 is expected, relative to the height of

  said first part, so that the radial bore 40 is again

  Calf accessible after assembling the two coupling parts.

  According to an alternative embodiment, not shown

  felt, the forearm 18 and the cross 42 could also be made in one piece. Instead of being provided with the radial bore 40 to receive a locking pin, the second coupling portion 34 could also

  be designed in such a way as to have an automatic locking device

  blocking that while allowing threading the first part

  coupling, would be placed in a locked position,

  under the action of a jurisdiction, as soon as the said first part

  This means of locking could be

  locked, either manually by means of a Bowden cable or the like, or by means of a control motor, in particular actuated

electric.

  The connecting device 10 according to the invention

  just described works as follows.

  To connect the equipment 14 to the towing vehicle 12, the frame 16 is first connected to the three-point equipment hitch 20 of said vehicle. The towing vehicle 12 of the equipment 14 is then approached so that the opening receiver of the first

  coupling part is vertically aligned with the second part

  34, and the frame 16 is lifted until the second portion 34 is completely passed through the receiving opening and the forearm

  18 arrived against the console 32 or against a pistol.

  Secondly, finally, if necessary, we put the esse

  or similar stop pin in the radial bore 40.

  After having thus connected the equipment 14 to the towing vehicle 12, the transmission shaft 28 is fitted onto the PTO shaft 26, and a parking stand, which may be present during the traction, is disassembled or disengaged by pivoting. equipment, both the equipment 14 and the towing vehicle 12 can adapt to the irregularities of the ground, since the second coupling part 34, made in the form of a pivot, is mounted in the forearm 18, together with the first coupling part made in the form of a ball, pivotable both transversely to the longitudinal axis and in the direction of said forearm. During a turn, the first coupling part can therefore rotate both in the second part 34, that together with the latter in the forearm 18.

Claims (7)

  1. Connecting device (10) for the drawbar (30) of an equipment (14) towed in operation, in particular for a mower, with a frame (16) articulated to a three-point equipment hitch (20). a towing vehicle (12) and at the rear end of which is a first part of a coupling, while the second part (34) of the coupling is mounted on the underside of the drawbar (30), characterized in that that the two coupling parts are brought into mutual engagement by a vertical movement and are configured and arranged so that they allow an inflection movement   and twisting between the frame (16) and the drawbar (30).   The connecting device according to claim 1, wherein a forearm (18) extends from the frame (16) towards the equipment (14), forearm in the end region.   cantilever of which is said first coupling part.   3. Connecting device according to claim 1 or 2, wherein the frame (16) is connected in mobility to the towing vehicle (12) via two lower oscillating arms (22) and an upper oscillating arm (24). ), a cross member (42), constituting or carrying the forearm (18), extending between the points   connecting the lower oscillating arms (22).   4. Connection device according to any one of   preceding claims, wherein said first part   coupling is in the form of a ball, with a receiving opening and mounted in mobility in the frame (16) or in his forearm (18).   5. Connection device according to any one of   preceding claims, wherein the second part   coupling (34) is formed in the form of a pivot, rigidly fixed to the drawbar (30) and intended to be received in the aforementioned receiving opening. 6. Connection device according to claim 5, wherein the second part (34) has a self-locking locking device, against which said first part can   be brought axially into application.   Connecting device according to claim 5 or 6, wherein the second part (34) can be mounted in different positions on the drawbar (30).