JPH0132805Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a coupling device for agricultural machinery, and relates to a device for coupling agricultural machinery such as a tiller to a tractor.

(Prior art) Conventionally, as a coupling device for this type of agricultural machine,
For example, as described in Japanese Utility Model Application Publication No. 53-58108, the upper end of the mast of an agricultural machine is connected to the tip of the top link of the tractor by a spindle, and the tips of the left and right lower links of the tractor are The lower pin of the above is engaged in the hitch of the agricultural working machine, the left and right lower pins are locked by a locking piece energized by a tension spring, and the release piece energized by the above-mentioned tension spring is rotated by this locking piece. A structure is known in which the rope is freely engaged and one end of the rope is locked to the release piece.

(Problems to be solved by the invention) According to the structure described in the above publication, the connection between the top link and the mast and the connection between the left and right lower pins and the left and right hits must be performed separately, and furthermore, the top link and the mast must be connected separately. After connecting the left and right lower links, the left and right lower links are rotated upward and the lower pins are fitted to the left and right hits, so when making this connection, it is difficult to align the mutually connected parts when the tractor is backed up relative to the agricultural machine. Moreover, the backward stop position of the tractor tends to be unstable and uncertain, and since the top link and the mast are connected by inserting and locking the support shaft, there is a problem that it takes time and effort to connect the top link and the mast.

Therefore, the present invention was developed in view of these points, and it is possible to connect the three-point connection part on the tractor side and the three-point connection part on the agricultural machine side at the same time. The purpose of the present invention is to provide a coupling device that can stably and reliably determine the backward stop position of the tractor and the alignment of mutual coupling parts, thereby easily and reliably coupling agricultural machinery to the tractor. It is something.

[Structure of the idea]

(Means for Solving the Problems) The agricultural machine coupling device of the present invention connects the coupling frame 4 to the three-point suspension mechanism of the tractor 1, moves the tractor 1 backward toward the farm machine 14, and connects the By the upward rotation of the frame 4, the upper hitch fitting 48 of the agricultural working machine 14 is connected to the upper connecting pin 10, and the lower pins 12 on the left and right sides of the connecting frame 4 are connected to the agricultural working machine 14.
In the device for connecting the left and right lower hitch metal fittings 26, the upper hitch metal fitting 48 forms a holding portion 48a for holding the connecting pin 10 between the front side piece 49 and the rear side piece 50, and the lower side The connecting pin 10 is formed into an open inverted U-shape, and the connecting pin 10, which extends downwardly from the lower edge 27a of the front piece 49 and moves backward, engages with the lower part of the rear piece 50, and pushes it upward. The left and right lower hit metal fittings 26 form a holding part 29 between the front piece 27 and the rear piece 28 that holds the left and right lower pins 12, and the left and right lower hit metal fittings 26 form a holding part 29 that holds the left and right lower pins 12. The left and right lower pins 12, which are formed in a U-shape and extend downwardly from the lower edge 27a of the front piece 27 and move backward, are engaged with the lower part of the rear piece 28 through a guide hole 31. A locking portion 36 is formed with an engaging guide piece 30 that guides the left and right lower hit fittings 26 upwardly, and that extends and retracts from the guide hole 31 into the holding portion 29 and locks the left and right lower pins 12. and a lock arm 35 having a release lever 34.
A spring 38 is attached to the lock arm 35 so that the locking part 36 is always projected into the holding part 29.

(Function) The agricultural working machine coupling device of the present invention is capable of connecting the agricultural working machine 14
When tractor 1 is backed up against
A connecting frame 4 connected and supported by a three-point suspension mechanism.
The upper connecting pin 10 abuts and engages with the lower engagement guide piece 51 of the upper hitch fitting 48 of the agricultural working machine 14, and the left and right lower pins 12 of the connecting frame 4
are abutted and engaged with the lower engagement guide pieces 30 of the left and right lower hitch fittings 26 of the agricultural working machine 14. This allows the tractor 1 to stop moving backward, and the upper connecting pin 10 and the upper hitch fittings 48, as well as the left and right lower pins 12 and the left and right lower hitch fittings 26, are aligned in preparation for connection.

Next, when the hydraulic drive of the tractor 1 is activated and the connecting frame 4 is pulled up together with the three-point suspension mechanism, the left and right lower pins 12 are rotated upward along the engagement guide pieces 30 and are engaged with the locking portions 36 of the lock arms 35. However, due to the pulling force of the left and right lower pins 12, the locking portion 36 is pushed against the spring 38, the lock arm 35 is rotated, and the locking portion 36 is pushed outward from the guide hole 31. While being pushed out, the left and right lower pins 12 are inserted into the holding portion 29 of the lower hitch fitting 26. Also, left and right lower pin 1
2 is inserted into the holding part 29, the lock arm 35 is rotated back by the restoring force of the spring 38, and its locking part 36 is automatically projected into the holding part 29 from the guide hole 31. This locking portion 36 prevents the lower pin 12 from coming off. As a result, the left and right lower pins 12 are connected within the left and right lower hitch fittings 26. Also, this left and right lower pin 1
2, the upper connecting pin 10 is similarly rotated upward along the engagement guide piece 51 and inserted into the holding portion 48a in the upper hitch fitting 48. As a result, the agricultural machine 14 is automatically connected to the tractor 1 via the connection frame 4.

When the release lever 34 is rotated, the lock arm 35 is rotated against the spring 38, and the locking portion 36 of the lock arm 35 is withdrawn from the holding portion 29 through the guide hole 31. The lower pin 12 in the holding portion 29 is unlocked. Then, by the downward rotation of the connecting frame 4, the connection between the connecting frame 4 and the agricultural machine 14 is released.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In the figure, 1 is a tractor, and this tractor 1
A top link 2 is attached to the rear upper part of the tractor 1 so as to be freely rotatable in the vertical direction, and lower links 3 are attached to the left and right sides of the rear lower part of the tractor 1 so as to be freely rotatable in the vertical direction. The top link 2 and the left and right lower links 3 constitute a three-point suspension mechanism.

4 is a connecting frame formed in a gate shape,
Connecting pieces 6 are erected in parallel to each other on the horizontal rod portions 5 of the connecting frame 4, and the top link 2 is disposed between the upper ends of the opposing connecting pieces 6.
A connecting portion 7 for inserting a connecting pin is formed to removably and rotatably connect the rear end portions, and the opposing connecting pieces 6 are supported halfway by a support rod 8 serving as a connecting pin. . Further, connecting protrusions 9 are provided in parallel to each other at the rear of the horizontal rod portions 5 of the connecting frame 4, and a horizontal rod-shaped connecting pin 10 is fixed between the rear ends of the connecting protrusions 9. has been done. Further, a lower pin 12, which connects the rear end of the lower link 3 at its outer end in a detachable and rotatable manner, is provided on the lower outer side of the left and right vertical rod portions 11 of the connection frame 4 in a substantially horizontal manner, and These left and right lower pins 12
A disk-shaped flange 13 is fixed to the inner end of the flange 13 .

Reference numeral 14 denotes a tilling and crushing machine as an agricultural working machine, and this tilling and soil crushing machine 14 is equipped with a transmission 17 with an input shaft 16 protruding forward at the middle part of the main frame 15. Lower arms 18 are provided on both sides to protrude forward, and at the tips of the left and right lower arms 18, oblong guide plates 19 that gradually become wider toward the front are fixed with a plurality of bolts and nuts 20. , stopper pieces 21 are attached to the upper and lower edges of the left and right guide plates 19.
is bent horizontally outward. Further, the rear end of a hitch mounting plate 23 disposed inside the guide plate 19 is attached to the horizontal shaft 22 to which the left and right guide plates 19 and the tips of the lower arm 18 are fixed, so as to be rotatable in the vertical direction. A locking hole 24 is bored at the tip of the guide plate 19 midway up and down the plate 23.
A plurality of communication holes 25 are bored to communicate with each other, and lower hitch fittings 26 for removably connecting the lower pin 12 are fixed to the lower tips of the left and right hitch mounting plates 23. The left and right lower hit fittings 26 are formed into a substantially inverted U-shape with openings on the lower side, and a curved holding portion 29 that holds the lower pin 12 at the upper part of the front side piece 27 and the rear side piece 28. An engagement guide piece 30 is integrally provided at the lower part of the rear piece 28 and extends downwardly from the lower edge 27a of the front piece 27. A vertically long guide hole 31 is bored. Further, a mounting rod 33 is horizontally suspended between the mounting pieces 32 protruding from the upper portions of the left and right lower hitch fittings 26 and the hitch mounting plate 23, and a release lever 34 is rotatably mounted on the mounting rod 33. The upper part of a lock arm 35 formed in a substantially C-shape is integrally fixed to the lower part of this release lever 34, and an arc-shaped locking part 36 at the lower end of this lock arm 35 is inserted from the guide hole 31 into the above-mentioned holding part. It protrudes into and out of the opening 37 of the portion 29 . Further, one end portion 38a of the coil spring 38 wound around the mounting rod 33 is locked to the release lever 34, and the other end portion 38b is locked to a locking portion 39 of the hitch mounting plate 23, respectively. and,
Due to this coil spring 38, the lock arm 35 is always energized and its locking portion 36 is locked into the guide hole 3.
1 into the opening 37 of the holding part 29 and locks the lower pin 12 inserted into the holding part 29 from below.

Next, mounting pieces 40 are horizontally protruded from the upper ends of the left and right guide plates 19, and the handle 4 is connected between the opposing mounting pieces 40 via a horizontal shaft 41.
A rod-shaped stopper 43 is fixed to the lower end of the handle 42.
is inserted into a selected one of the locking hole 24 of the guide plate 19 and the connecting hole 25 of the hitch mounting plate 23 from the guide hole 45 of the supporting frame 44 fixed to the guide plate 19 so as to be freely movable forward and backward. , this stopper 43
is energized by a spring 46 wound around it so that it always passes through one of the communication holes 25 of the hitch mounting plate 23 and projects outward.

Further, a top mast 47 is provided on the transmission 17 provided in the main frame 15 so as to protrude forward, and an upper hitch metal fitting for removably connecting and locking the connecting pin 10 of the connecting frame 4 to the tip of the top mast 47. 48 is fixed. The lower side of the upper hitch fitting 48 is opened to form a substantially inverted U-shape, and a curved holding portion 48a for holding the connecting pin 10 is formed at the upper part of the front side piece 49 and the rear side piece 50. An engagement guide piece 51 is integrally provided at the lower part of the rear piece 50 and extends downward from the lower edge 49a of the front piece 49.
The top mast 47 and the left and right lower arms 18 are connected by stays 52 and maintained at a distance.

Furthermore, a rotary work body 55 is constructed by providing a large number of tilling claws 54 radially protruding in the axial direction between the lower ends of a chain case 53 and a bracket (not shown) attached to both ends of the main frame 15. The rotary work body 55 is rotatably mounted on a shaft, and is driven in conjunction with the transmission 17 via an interlocking medium (not shown).
In the figure, 56 is a cover body that covers the upper part of the rotary work body 55, and 57 is rotatably attached to the cover body 56, and a mounting piece 58, a vertically movable rod 59, and a spring 60 are attached to the main frame 15. It is a leveling plate that is supported through the .

In this structure, the handle 42 is rotated about the horizontal shaft 41, the stopper 43 is pulled out from the communication hole 25 against the spring 46, and the hitch mounting plate 23 is moved to the horizontal shaft 22.
As shown in FIG. 3, for example, as shown in FIG. , stopper 43
is pushed out by the restoring force of the spring 46 and automatically inserted into the selected upper communication hole 25, so that the left and right hitch mounting plates 23 are fixed at predetermined positions, and the left and right hitch mounting plates 23 are Board 2
The lower hitch fitting 26 at the tip of No. 3 is set at a predetermined position. This allows the left and right lower hitch metal fittings 2 to
6 is set corresponding to the height of the left and right lower pins 12 in the connecting frame 4 of the tractor.

Next, when the tractor 1 is moved backward with respect to the tiller 14, the connecting pin 10 at the top of the connecting frame 4 connected and supported by the top link 2 of the tractor 1 and the left and right lower links 3 is connected to the upper hitch of the tiller 14. The rear piece 50 of the metal fitting 48 abuts and engages with the lower engagement guide piece 51, and the connecting frame 4
The left and right lower pins 12 abut and engage with the lower engaging guide pieces 30 of the rear pieces 28 of the left and right lower hit fittings 26 of the tiller 14. This allows the tractor 1 to stop moving backward, and the upper connecting pin 10 and the upper hitch fittings 48, as well as the left and right lower pins 12 and the left and right lower hitch fittings 26, are aligned in preparation for connection.

Next, when the hydraulic drive of the tractor 1 is activated and the connection frame 4 is pulled up together with the top link 2 and the left and right lower links 3, the left and right lower pins 12 are rotated upward along the engagement guide pieces 30, and the lock arm 35 is locked. However, due to the pulling force of the left and right lower pins 12, the locking portion 36 is pushed against the coil spring 38, and the lock arm 35 moves counterclockwise in FIG. 3 about the mounting rod 33. The locking portion 36 is pushed outward from the guide hole 31, and the left and right lower pins 1
2 is inserted into the holding part 29 of the lower hit fitting 26. Further, the left and right lower pins 12 are inserted into the holding part 29, and the lock arm 35 is rotated back clockwise in FIG. 36 is automatically projected from the guide hole 31 into the opening 37 thereof, and the lower pin 12 is locked into the holding portion 29 by the locking portion 36 without coming off. As a result, the left and right lower pins 12 are connected within the left and right lower hitch fittings 26. Further, as the left and right lower pins 12 are connected, the upper connecting pin 10 is similarly rotated upward along the engagement guide piece 51 and inserted into the holding portion 48a in the upper hit fitting 48. As a result, the tiller 14 is automatically connected to the tractor 1 via the connection frame 4.

Also, one end of a power transmission shaft (not shown) is connected to the power output shaft of the tractor 1 via a universal joint, and the other end of this power transmission shaft is connected to the tiller 1 through a universal joint.
It is connected to the input shaft 16 of the transmission 17 of No. 4. As a result, the power of the tractor 1 is transmitted to the input shaft 16 of the tiller 14.

Then, the tractor 1 is driven to operate the tiller 14.
When the input shaft 16 is driven in conjunction with the power take-off shaft of the tractor 1 via the power transmission shaft, the rotary work body 55 is rotated through the transmission 17 and the interlocking medium.
The rotary work body 55 advances the field while plowing and crushing or raking the soil, and the field is leveled by the leveling plate 57. In addition, when separating the tiller 14 connected to the tractor 1 from the tractor 1, when the release lever 34 is rotated about the mounting rod 33, the lock arm 35 resists the coil spring 38 and rotates counterclockwise in FIG. The locking portion 3 of the lock arm 35
6 is withdrawn outward from the holding part 29 through the guide hole 31, and the lower pin 12 in the holding part 29 is unlocked. When the connecting frame 4 is rotated downward by the top link 2 and the left and right lower links 3 of the tractor 1, the upper connecting pin 10 of the connecting frame 4 is moved to the holding portion 48a of the upper hitch fitting 48 of the agricultural machine 14. The left and right lower pins 12 are separated from the holding portions 29 of the left and right lower hitch fittings 26 of the agricultural working machine 14, and the connection between the connecting frame 4 and the agricultural working machine 14 is released.

In this embodiment, two communicating holes 25 are shown in the upper and lower directions of the hitch mounting plate 23, but the present invention is not limited to this, and more communication holes may be provided in the vertical direction.
As a result, the adjustment range of the vertical position of the lower hit metal fitting 26 can be widened and set appropriately, and the working conditions in the field can be adequately coped with.

In addition, in the implementation, locking protrusions are provided on the lower pins 12 on both sides to protrude outward from the flanges 13, and these locking protrusions engage with the lower hitch metal fittings 26 to prevent vibrations during work. It is preferable to prevent the connecting frame 4 from rotating due to the rotation of the connecting frame 4.

In addition, a locking means such as a metal fitting or a pin for locking the release lever 34 of the lock arm 35 is attached to the hit mounting plate 23, and this locking means prevents the release lever 34 from rotating due to vibrations during work. It is a good idea to do so.

[Effects of the invention] According to the invention, by moving the tractor 1 backward relative to the front of the agricultural working machine 14, the left and right lower pins 12 of the connecting frame 4 connected to the three-point suspension mechanism of the tractor 1 are connected to the agricultural working machine 14. At the same time, the upper connecting pin 10 of the connecting frame 4 contacts the engaging guide pieces 5 of the upper hit fittings 48 of the agricultural working machine 14.
Therefore, the upper, lower, left and right engaging guide pieces 30, 51 can easily align the connecting positions of the three-point connecting parts, and also prevent the tractor 1 from retreating. It can be stopped reliably. In addition, by lifting and rotating the connecting frame 4 using the three-point suspension mechanism after setting it to the above-mentioned relative position, the left and right lower pins 12 and connecting pins 10 are guided by the respective engagement guide pieces 30 and 51 and lifted, respectively. can be reliably guided and fitted into the holding part 48a of the upper hit fitting 48 and the holding parts 29 of the left and right lower hit fittings 26, and
In the case of the left and right lower hitch metal fittings 26, the holding part 2
Since the locking portion 36 of the lock arm 35 which is biased and supported by the spring 38 protrudes inside the locking portion 9, the locking portion 36 is pushed from below by the lifting force of the lower pin 12 and is engaged with the spring 38. When the lower pin 12 is fitted into the holding part 29, the locking part 36 is automatically rotated from the guide hole 31 by the return force of the spring 38. The lower pin 12 can be reliably locked in the holding portion 29 by the lower pin 12 being returned to its original position. Further, since the left and right lock arms 35 have release levers 34, the locks of the left and right lower pins 12 can be easily released by rotating the release levers 34. Therefore, it is possible to stably and reliably determine the backward stop position of the tractor with respect to the agricultural machine and the mutual alignment of the connecting parts, and also to simultaneously connect the three-point connecting part on the tractor side and the three-point connecting part on the agricultural working machine side. It is possible to provide a connecting device with excellent operability, which can be connected in various ways.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view of the agricultural machine connected to the tractor, Fig. 2 is a perspective view of the above coupling device, and Fig. 3 is the installation of the upper and lower hitch fittings. It is a perspective view of a mechanism part. 1...Tractor, 2...Top link, 3...
Lower link, 4...Connection frame, 10...Connection pin, 12...Lower pin, 14...Agricultural machine, 2
6... Lower hitch fitting, 27, 49... Front piece,
28, 50... Rear piece, 30, 51... Engagement guide piece, 29, 48a... Holding part, 31... Guide hole,
34...Release lever, 35...Lock arm, 3
6...Locking portion, 38...Spring, 48...Upper hitch fitting.

Claims (1)

[Claims for Utility Model Registration] The connecting frame 4 is connected to the three-point suspension mechanism of the tractor 1, and the tractor 1 is connected to the agricultural machine 1.
4, and by upward rotation of the connecting frame 4, the upper hitch fitting 48 of the agricultural working machine 14 is connected to the upper connecting pin 10, and
In a connecting device that connects the left and right lower hitch fittings 26 of the agricultural working machine 14 to the left and right lower pins 12 of the connection frame 4, the upper hitch fittings 48 are connected between the front side piece 49 and the rear side piece 50. A holding portion 48a for holding the pin 10 is formed in an inverted U-shape with an open lower side, and extends long downward from the lower end edge 49a of the front piece 49 at the lower part of the rear piece 50. The left and right lower hitch fittings 26 form an engagement guide piece 51 with which the retracting connecting pin 10 engages and guides it upward;
A holding portion 29 for holding the left and right lower pins 12 is formed between the rear side piece 28 and the left and right lower pins 12 to form an inverted U-shape, and a guide hole 31 is formed in the lower part of the rear side piece 28.
The left and right lower pins 1 extend downwardly from the lower edge 27a of the front piece 27 via the
2 engages and guides it upward.
The guide hole 3 is formed in the left and right lower hitch fittings 26.
1, a lock arm 35 having a locking portion 36 that protrudes and retracts into the holding portion 29 and locks the left and right lower pins 12 and has a release lever 34 is rotatably supported, and is locked to the lock arm 35. The spring 3 is energized so that the portion 36 always protrudes into the holding portion 29.
8. A coupling device for agricultural machinery, characterized in that a number 8 is attached thereto.