JPH0316912Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a mechanism for easily attaching and detaching a front loader to which an advanced working device such as a bucket belt can be detachably attached to a tractor.

``Conventional technology'' A front loader, which has an advanced working device such as a bucket, manifold oak, or hayfoke removably attached to its tip, is attached to a tractor and performs various tasks such as digging, scooping, and loading, and is used for agricultural work, etc. widely used.

In the type that uses a straight bar stand to attach and detach the front loader, the stand is erected on the ground to support the lift arm so that it does not go down, the tractor is moved forward, and the front loader is connected with a docking pin. When the front loader is to be removed, the dotting pin is removed while the front loader is supported by the stand, and then the tractor is moved backward.

``Problems that the invention aims to solve'' By the way, when attaching and detaching such a front loader, moving the tractor forward and backward, opening and closing valves, attaching and detaching hydraulic pipes, operating levers, etc. are complicated and troublesome, and moreover, it is difficult to attach and detach the front loader. It takes a "trick". For this reason, it is difficult for front loader operators, especially farmers who operate agricultural front loaders, to attach and detach the front loader.

"Problems to be Solved by the Invention" This invention aims to facilitate the attachment and detachment of the front loader as described above, and has the following configuration.

The bracket attached to the tractor is provided with a connecting recess that opens upward and has a guiding back surface in the upper part, and a docking pin hole in the lower part.

The main frame supporting the front loader is provided with at least one pair of upper and lower pin holes with a pitch equal to the pitch between the center of the connecting recess and the center of the docking pin hole.

A connecting pin is inserted into the upper pin hole and the connecting recess, and a docking member is inserted into and removed from the lower pin hole and the docking pin hole, so that the front loader can be detachably attached to the tractor. do.

Furthermore, a link stand is attached to the front loader to support the grounded front loader. This link stand is formed by a main frame side link piece and a lift arm side link piece.

That is, the lower end of the double-acting hydraulic lift cylinder whose upper end is supported by the lift arm of the front loader is rotatably attached to the lower shaft supported at the lower part of the main frame by the main frame side link piece. Also, attach the lift arm side link piece to the lift arm so that it can rotate freely. Both link pieces are rotatably connected at the lower end with a connecting pin.

``Operation'' When detaching the front loader from the tractor, ground the front loader, remove the docking pin, and ground the link stand to support the front loader. Next, when the lift cylinder is retracted, the main frame rotates clockwise around the connecting pin. As the main frame rotates, the main frame side link rotates counterclockwise about the connection pin, thereby raising the main frame. Therefore, the connecting pin rises along the guiding back surface of the connecting recess. When the connecting pin becomes higher than the front surface of the connecting recess, the lift cylinder is stopped, the hydraulic pressure connected to the front loader is disconnected, and the tractor is moved backward.

When attaching the front loader to a tractor, the tractor is moved forward to bring the connecting recess and the guiding back surface into contact with the connecting pin of the main frame. Next, when the hydraulic pressure between the tractor and front loader is connected and the lift cylinder is extended, the main frame will rotate counterclockwise around the connecting pin, so as the main frame rotates, the main frame side link The piece descends while rotating clockwise as a connecting pin shaft. The connecting pin therefore descends along the guiding back surface and fits into the connecting recess.

Finally, insert the docking pin into the lower pin hole and the docking pin hole.

In addition, remove the link stand, leave the connecting pin attached, or remove the connecting pin.
Perform loader work by attaching it to the mounting means on the front loader side.

``Example'' This invention will be described in detail below based on the illustrated example.

Reference numeral 1 designates a tractor, and front loader attachment/detachment brackets 2 are fixedly installed on both sides of the front part of the bonnet.
Reference numeral 3 denotes a receiving member integrally provided at the front end of the bracket 2, and the receiving member 3 projects toward the front of the bonnet. As shown in detail in FIG. 3, this receiving member 3 is provided with a hook-shaped connecting recess 4 that opens upwards at the upper part, and a rising portion at the rear thereof forms a guiding back surface 4'. do.
Also, in the lower part of the receiving member 3, there is a pin hole 5 for docking.
1 is installed through it.

6 is a front loader, and at its tip,
For example, a tip working device 7 such as a bucket can be attached and detached.

Reference numeral 8 denotes a pair of left and right main frames, from the bottom of which a lift cylinder mounting member 8' projects diagonally rearward. At the rear of the main frame 8, there is a fourth
As shown in detail in the drawings and FIG. 5, support members 9 each having a U-shaped cross section are fixedly provided, into which the receiving member 3 is inserted. In the case of the illustrated embodiment, five pin holes 10a to 10e are formed through the support member 9 at regular intervals in the vertical direction. That is, a pair of pin holes 10a and 10c, which have the same pitch as the center of the connecting recess 4 of the receiving member 3 and the center of the docking pin hole 5,
Three pairs, 10b and 10d, and 10c and 10e, are arranged in parallel. These pairs of pin holes are for adjusting the height of the mounting position of the front loader 6.
In the case of Figures 1 and 2, 10a is the upper pin hole, 10
c is the lower pin hole. Of course, it is optional to provide two or four or more pairs of pin holes, and if the mounting position of the front loader 6 is to be fixed, a pair of upper and lower pin holes may be provided.

11 is a pair of left and right lift arms, and 12 is a double-acting hydraulic lift cylinder that raises and lowers the lift arms 11. Installation of the lift cylinder 12 will be described later.

Reference numeral 13 denotes a pair of left and right link stands, which are a feature of this invention, and support the front loader 6 when it is on the ground. Lift arm side link piece 1
4. The main frame side link piece 15 constitutes the lift arm 11. Lift arm side link piece 1
4 has a pin hole penetrated through both ends, and the upper end is attached to a mounting shaft 17 of a dump link 16' connected to a dump cylinder 16 that operates the tip working machine 7, and is attached with a round pin or the like (not shown). It is locked. The main frame side link piece 15 also has pin holes penetrated at both ends, and the upper end has an upper shaft 20 for pivotally connecting the lift cylinder 12 to the lift arm 11.
It is rotatably attached to the holder and is removably locked by a round pin (not shown). The lower end of the main frame side link piece 15 is connected to the lift cylinder 1.
On the lower shaft 18 of the mounting member 8' supporting the lower end of 2,
It is detachably attached and secured with a round pin (not shown).

In the illustrated embodiment, both link pieces 14, 15
A docking pin 19 is used as a connecting pin to connect the two. That is, when the front loader 6 is detached from the tractor 1 and is grounded, the docking pin 19 is removed and removably inserted into the pin hole at the lower end of both link pieces 14 and 15. , use a round pin (not shown) to lock it. In this way, the link pieces 14 and 15 are rotatably connected to each other to form the link stand 13,
The front loader 6 is supported on the ground (see Figure 1). As described above, when attaching the front loader 6 to the tractor 1, the docking pin 19 is removed from the link stand 13 and inserted into the lower pin hole 10c and the docking pin hole 5.

The storage means when the link stand 13 is not in use will be explained.

Remove the dotting pin 19 and remove both link pieces 1.
4 and 15 are rotated upward so as not to interfere with loader work, etc., and the lift arm side link piece 14 is locked to the upper shaft 20 with a round pin or the like. In addition, the main frame side link piece 15 is removed from the lower shaft 18 and attached to the mounting frame 21 (fourth frame) provided on the main frame 8.
5), and insert the upper pin hole into the lift arm mounting shaft 22. The imaginary lines in FIG. 1 indicate both link pieces 14 and 15.
It shows the state in which it is stored.

Reference numeral 23 denotes a connecting pin, which is removably inserted into the upper pin hole 10a of the support member 9 and the connecting recess 4 of the receiving member 3 when the front loader 6 is mounted on the tractor. Similarly, the docking pin 19 is removably inserted into the lower pin hole 10c of the support member 9 and the docking pin 5 of the receiving member 3.

Instead of the above-mentioned embodiment of the link stand 13,
It is also optional to use a dedicated connecting pin instead of the docking pin 19 as the connecting pin for both link pieces 14 and 15. Also, both link pieces 14, 15
Connect the main frame 8 with the connecting pin.
Alternatively, it can be removably stored at an appropriate location on the lift arm 11.

Furthermore, the attachment position of the lift arm side link piece 14 to the lift arm 11 and the attachment position of the main frame side link piece 15 to the main frame 8 are not limited to the embodiments, and the structures of the main frame 8 and the lift arm 11, It can be arbitrarily selected depending on the size of the link stand 13, etc.

``Effects'' The front loader can be attached to and detached from the tractor while being supported by the link stand that rotates mainly due to the expansion and contraction of the lift cylinder. Therefore, the attachment/detachment operation is much easier than before without requiring any "tricks".

Furthermore, since the front loader is supported by a lift stand even on uneven ground or in places with poor ground, it can be easily attached and detached.

Furthermore, since the structure of the link stand is extremely simple, it can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a side view of a front loader attached to a tractor that is grounded and supported by a link stand, and shows a case where docking pins are used as connection pins. FIG. 2 is a side view when the front loader is completely detached. Figure 3 is an enlarged side view of the receiving member, Figure 4 is an enlarged side view of the main frame, and Figure 5 is an enlarged side view of the receiving member.
The figure is a cross-sectional view of the main frame side link piece, showing a state in which the main frame side link piece is retracted. 1...Tractor, 2...Bracket, 3...Receiving member, 4...Connecting recess, 4'...Guiding back surface,
6...Front loader, 8...Main frame,
10a-10e...Pin hole, 11...Lift arm, 12...Lift cylinder, 13...Link stand, 14...Lift arm side link piece, 15
... Main frame side link piece, 18 ... Lower shaft,
19... Connection pin (docking pin), 23...
connecting pin.

Claims (1)

[Scope of Claim for Utility Model Registration] The bracket attached to the tractor has a connecting recess that opens upward and has a guiding back surface at the top, and a docking pin hole at the bottom, and the main frame that supports the front loader. At least one pair of upper pin holes and lower pin holes are provided at a pitch equal to the pitch between the center of the connecting recess and the center of the docking pin hole, and a connecting pin is provided in the upper pin hole and the connecting recess. The front loader is removably attached to the tractor by inserting and removably inserting the dotting pin into the lower pin hole and the docking pin hole. The main frame side link piece is rotatably attached to the lower shaft that supports the lower end of the hydraulic lift cylinder at the lower part of the main frame, and the lift arm side link piece is rotatably attached to the lift arm. A front loader attachment/detachment mechanism using a link stand that is rotatably connected to each other with a connecting pin to form a link stand that supports a grounded front loader.