JPS6121928Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an extension bracket attachment device for agricultural machinery in which an extension bracket is attached to a top link bracket in order to ensure a large lifting height of a working machine. It is.

[Prior art]

For example, in the case of tractors, etc., rotary tiller work equipment is attached removably, and the work equipment is attached using a special three-point linkage system to ensure a large lifting height. An extending bracket is detachably attached to the top link bracket, and a top link for connecting a working machine is rotatably attached to the extending bracket.

At least two sets of mounting holes are provided between the extension bracket and the top link bracket to facilitate attachment and detachment, and the extension bracket is fixed by inserting a mounting pin into these mounting holes. It is becoming more and more common.

However, in order to make it easier to insert and remove the mounting pin, play is generally provided between the mounting hole and the mounting pin. There is a problem in that noise and wear occur due to rattling of the mounting pins as the machine bounces or swings.

As a solution to this problem,
A vibration prevention device as described in Publication No. 38837 has been proposed. However, this device is fixed by pulling a small fixing piece inserted between the holder and the mounting base in the insertion direction using a spring, and this spring can be used to manually control the elastic force. It is not only impossible to make the mounting pin strong enough to exceed the operating force required by hand, and it is not only impossible to completely absorb the looseness of the mounting pin caused by swinging under a high load that cannot be achieved by human power, but also has the disadvantage that the structure is complicated.

[Purpose of invention]

The present invention was devised in view of the above-mentioned conventional situation and to eliminate the drawbacks, and uses a strong elastic body interposed between the bracket and the extending bracket to completely eliminate the play of the mounting pin. It is an object of the present invention to provide an extension bracket attachment device for an agricultural machine that has an extremely simple structure that can absorb the bracket.

[Structure of the idea]

The extending bracket attachment device for agricultural machinery according to the present invention which achieves the above object includes inserting the extending bracket into a top link bracket fixedly installed on the agricultural machinery body, and inserting mounting pins into at least two sets of mounting holes provided in both of the top link brackets. In an agricultural machine in which a work machine is connected to the other end of the extending bracket so as to be able to be raised and lowered by a lift arm through a link, a leaf spring-like elastic body whose base end is attached to the extending bracket side is used. , is installed diagonally so that its protruding end contacts the top link bracket, and with the mounting pin inserted into the lower mounting hole, the extending bracket resists the elastic body's elasticity by the upward movement of the lift arm. This feature is characterized in that the upper mounting hole is aligned with the upper mounting hole and the mounting pin is inserted by rotating the mounting pin.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be explained.

As shown in FIG. 1, reference numeral 1 denotes a tractor body, and the power of this tractor body 2 is transmitted to a rotary tiller 3 via a universal joint 2. As shown in FIG. The rotary tiller 3 has an upper end of a mast 6 erected on the rotary tiller 3 rotatably supported by one end of a top link 9 via a shaft 8, and the other end of the top link 9. is rotatably attached to the extending bracket 10 by its top link attachment shaft 11.

This extending bracket 10 is attached to a top link bracket 12 fixed to the tractor body 1 side via attachment pins 13 and 14, as will be described in detail later, and the base end is attached to the extending bracket 10. By bringing the protruding end of the oblique leaf spring 15 into contact with the top link bracket 12, an elastic force is applied in the direction in which the extending bracket 10 moves away from the top link bracket 12. There is.

Reference numeral 16 denotes a lift arm that rotates by hydraulic pressure around a drive shaft 17, and its tip is connected to the lower link 12 via a link 22. Therefore, when the lift arm 16 rotates up and down, the lower link 12 moves up and down in conjunction with it, and the rotary cultivating section 3 is raised and lowered.

Now, when the rotary tilling unit 3 is raised by the lift arm 16, the center of gravity of the rotary tilling unit 3 is located behind the shaft 5 of the lower link (to the right in the figure), so the shaft 8 of the mast 6 is connected to the shaft 5 of the lower link 4.
A moment acts in the direction of arrow A about the center. This force pulls up the top link mounting shaft 11 of the extension bracket 10 via the top link 9, and also acts on the mounting pins 13 and 14.

Further, the extension bracket 10 has mounting holes 18, 1.
9 are bored, and corresponding to the mounting holes 18 and 19, the top link bracket 12 also has mounting holes 2.
0 and 21 are drilled, and the mounting holes 18 and 20 and the mounting holes 19 and 21 of both are formed into sets, respectively.

2A and 2B show the state in which the extension bracket 10 is attached to the top link bracket 12. First, with the rotary tiller 3 lowered as shown in Figure 2A, the lower mounting hole 1 is opened.
Insert the mounting pin 14 into the pair 9 and 21. At this time, the upper mounting holes 18 and 20 are biased with an elastic force that causes the extending bracket 10 to move away from the top link bracket 12 when the tip of the obliquely installed leaf spring 15 comes into contact with the top link bracket 12. Therefore, it is in a state where they do not match.

When the lift arm 16 is moved upward from this state to raise the rotary tiller 3, the aforementioned force from the rotary tiller 3 acts in the direction of arrow B, as shown in FIG. 1
4 and rotates upward against the elastic force of the leaf spring 15. This rotation of the extending bracket 10 causes the leaf spring 15 to bend and strengthen its elastic force, and the mounting holes 18 and 20 are brought into alignment, so that the mounting pin 13 can be inserted.

This completes the attachment of the extension bracket 10 to the top link bracket 12, but there is a strong elastic force between the two, which can be bent by the upward movement of the lift arm 16, and a strong elastic force by the leaf spring 15. The elastic force of the leaf spring 15, which can be made stronger than this manual operation force, allows the attachment holes 18, 19, 20, 21 and the attachment pin 1 to be separated from each other.
3 and 14 is completely removed, making it possible to completely prevent noise and wear during work.

3A and 3B show another embodiment of the present invention, in which the chain 26 is moved by using the force of the lift arm 16 instead of using the weight of the rotary tiller 3 during lifting and lowering as in the previous example. The extension bracket 10 is pulled up through the bracket, and the same effect as the previous example is obtained.

That is, first, as shown in FIG. 3A, the extending bracket 10 is lowered and the lower mounting holes 19, 2 are inserted.
1, and then rotate the lift arm 16 upward to lift the extending bracket 10 around the mounting pin 14, so that the upper mounting holes 18 and 20 are aligned as shown in FIG. 3B. When the condition is reached, the mounting pin 13 is inserted.

[Effect of idea]

In short, the extending bracket attachment device for agricultural machinery according to the present invention is capable of attaching and detaching the extending bracket to and from the top link bracket fixed to the agricultural machinery body by inserting mounting pins into at least two sets of mounting holes provided in both. In an agricultural machine in which a working machine is connected to the other end of the extending bracket via a link so that it can be raised and lowered by a lift arm, a leaf spring-like elastic body whose base end is attached to the extending bracket is The end is installed diagonally so that it touches the top link bracket, and with the mounting pin inserted into the lower mounting hole, the extending bracket is rotated against the elastic force of the elastic body by the upward motion of the lift arm. Since the upper mounting hole is aligned with the upper mounting hole and the mounting pin is inserted, the extension bracket can be installed without the need for complicated parts. of,
Although the structure is extremely simple, it can be done by simply rotating the lift arm for upward movement against the elastic force of the obliquely installed leaf spring and inserting the mounting pin into the matching upper mounting hole. Furthermore, the leaf spring-like elastic body that separates the bracket and the extending bracket from each other can be made to have a strong elastic force that can be pressed and deformed by utilizing the upward movement of the lift arm, and this strong elastic force can cause the mounting pin to It is possible to completely absorb the backlash and completely prevent the noise and wear caused by the backlash.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 is a side view of a tractor equipped with a rotary tiller, Figs. 2 A and B are enlarged side views of essential parts explaining the installation operation of the extension bracket, and Fig. 3 A and B are views of other embodiments. FIG. 1...Tractor body, 3...Rotary tiller,
9... Link, 10... Extension bracket, 12... Top link bracket, 13, 14... Mounting pin, 1
5... Leaf spring, 16... Lift arm, 18, 19,
20, 21...Mounting holes.

Claims (1)

[Scope of utility model registration request] The extension bracket is removably attached to the top link bracket fixed to the agricultural machine body by inserting mounting pins into at least two sets of mounting holes provided on both sides, and a link is attached to the other end of the extension bracket. In an agricultural machine in which a working machine is connected to a lift arm so as to be able to be raised and lowered via a lift arm, a leaf spring-like elastic body whose base end is attached to the extending bracket side is installed diagonally so that its projecting end contacts the top link bracket, With the mounting pin inserted into the lower mounting hole, rotate the extending bracket for upward movement of the lift arm against the elasticity of the elastic body to match the upper mounting hole and insert the mounting pin. An extension bracket mounting device for an agricultural machine, characterized in that the extension bracket is configured to be inserted into the extension bracket.