JPH0698605A - Connecting device in working machine - Google Patents

Abstract

PURPOSE:To provide a connecting device designed to easily ensure a working machine to be connected via a three-point link mechanism to the rear of a tractor. CONSTITUTION:A pawl having a pair of left and right pawl recess 10 and a pawl shaft 13 is provided in between the rear of the three-point link mechanism Y for a tractor 1 and the front of a working machine 20 so as to allow the pawl shaft 13 to be clicked on the pawl recess 10, and a pair of left and right revolvable hooks 14 are provided at the pawl so that the pawl shaft 13 moves between the first revolving position A to check detaching the pawl shaft 13 from the pawl recess 10 and the second revolving position B to allow such detachment, and one of the two hooks 14 is clicked at the connecting device X for the working machine equipped with a spring 16 energizing on the first revolving position A, and the other hook 14 is clicked at the second revolving position B; in response to detaching the pawl shaft 13 from the pawl recess 10, the latter hook 14 is provided with a click 17 to release the click of this hook 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a connecting device for a working machine which is connected to a rear portion of a tractor via a three-point link mechanism.

[0002]

2. Description of the Related Art Conventionally, a three-point link mechanism has been widely used for connecting a working machine to a rear portion of a tractor, and a working machine connecting device connected through the three-point link mechanism is also used for the working machine. It was devised variously for the purpose of facilitating attachment and detachment. For example, as one of the above-mentioned inventions, a pair of left and right engaging recesses and detachable engagements between these engaging recesses are provided between the rear part of the three-point link mechanism attached to the rear part of the tractor and the front part of the working machine. An engaging portion having a pair of right and left engaging shaft portions to be engaged is provided, and a first rotating position for preventing the engaging shaft portion from being disengaged from the engaging recess portion, and an engagement portion from the engaging recess portion. A pair of rotatable hooks is provided on the left and right sides of the engaging part so that the engaging shaft part moves between the engaging shaft part and the second rotating position allowing the disengagement of the engaging shaft part. A spring for selectively urging the hook toward the first rotation position and the second rotation position in accordance with the above, is provided in the coupling device of the working machine, and the urging body has a stronger urging force than the spring. Is installed in the connecting device,
The hook is biased toward the first rotation position in response to the disengagement of the engagement shaft portion from the engagement recess.

[0003]

However, in the prior art, the urging force of the spring for urging the hook to the first rotation position is greater than the urging force of the spring for fixing the hook to the second rotation position. Was also set large,
When the hook is rotated, the balance of the urging force relationship between the two springs is lost due to the influence of frictional force, etc., so in order to prevent this, the spring for urging the first rotating position should be large. The drawback was that it had to be configured.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, between the rear part of the three-point link mechanism Y attached to the rear part of the tractor 1 and the front part of the working machine 20, a pair of left and right engaging recesses 10 and these engaging recesses 10 are detachably engaged. An engaging portion having a pair of left and right engaging shaft portions 13 is provided, the engaging shaft portion 13 is allowed to engage with the engaging recess portion 10, and the engaging shaft from the engaging recess portion 10 is provided. The first rotation position for preventing the detachment of the portion 13 and the engaging shaft portion 1
3 so that the engagement shaft portion 13 can move between a second rotation position that allows 3 to be disengaged from the engagement recess portion 10,
In the coupling device X of the working machine, which is provided with a pair of left and right rotatable hooks 14 on the engaging portion and a spring 16 for urging the hooks 14 toward the first rotational position, the hooks 14 are connected to each other. The hook 14 is provided with a locking body 17 that locks the hook 14 in the second rotation position and releases the hook 14 in response to the engagement shaft portion 13 being detached from the engagement recess 10. .

[0005]

The function of the present invention will be described. When the work implement 20 is connected to the tractor 1, the hook 1
4 is rotationally fixed to the first rotational position by the urging force of the spring 16 with the connecting pin 7 serving as a fulcrum, and prevents the engagement shaft portion 13 from being disengaged from the engagement recess 10. Then, when the work implement 20 is removed from the tractor 1, when the rotating lever 15 is operated from the first rotating position A to the second rotating position B to move the left and right hooks 14, The locking body 17 provided on the hook 14 is locked to the engagement shaft portion 13 and the hook 14 is fixed to the second rotation position, so that the engagement shaft portion 13 can be disengaged from the engagement recessed portion 10. To do. Further, when the engaging shaft portion 13 is disengaged from the engaging recessed portion 10, in response to this, the locking body 17 and the hook 14 pivot forward, return to the original first pivot position, and rejoin. Occasionally, the engagement shaft portion 13 is allowed to engage with the engagement recess 10.

[0006]

The problems to be solved and the means for solving the present invention are as described above. Next, the specific structure of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of a tractor with a working machine mounted, FIG. 2 is a side view of the working machine connecting device and the working machine of the present invention, FIG. 3 is a rear view of the working machine connecting device of the present invention, and FIG. 6 and 5 are side views showing a state in which the hook engages with the engagement shaft portion and is in the second rotation position.
Is a side view showing a state where the engaging shaft portion is disengaged and the hook is in the first rotation position. FIG. 7 is a side view showing a state where the hook is between the first rotation position and the second rotation position. FIG. 8 is a bottom view of FIG. 4, and FIG. 9 is a bottom view of FIG.

As shown in FIG. 1, a three-point link mechanism Y is attached to the rear part of the tractor 1 in advance, and the three-point link mechanism Y is attached.
The rear ends of the pair of left and right lower links 2 and top links 3 forming the above are pivotally supported by the connecting pin 5 and the connecting pin 7 of the connecting device X of the working machine of the present invention. The working machine 20 is attached to the device X.

First, as shown in FIGS. 3 and 4, the construction of the connecting device X of the working machine of the present invention is an arch-shaped connecting frame 8.
At the center of the upper part of the plate, a connecting support member 4 having a plate member symmetrically fixed in close proximity is projected rearward, and the connecting support member 4 is provided with an engaging recess 9 that opens upward. The engagement shaft portion 12 of the working machine 20 can be fitted. Further, connection support members 6 are fixed symmetrically on both ends of the arch-shaped connection frame 8, and the rear end of each lower link 2 of the three-point link mechanism Y is pivotally attached to each connection support member 6. A connecting pin 7 for supporting is provided so as to project outward, and an engaging recess 10 that is opened rearward is provided. A support rod 8a is horizontally installed between both ends of the connecting frame 8 to increase the strength of the connecting frame 8.

As shown in FIGS. 4 and 8, the connection support member 6 has a hook 14 which is rotatable about a connection pin 7.
The hook 14 is pivotally supported, and the hook 14 is fixedly provided with a rotary lever 15 which is rotatable between a first rotary position A and a second rotary position B, and is connected to the rotary lever 15. A spring 16 that biases the hook 14 toward the first rotation position A is interposed between the support members 6. An engaging body 17 having a horizontal axis in the left-right direction and having an L-shape in a side view is pivotally supported on the hook 14 substantially directly below the engaging recess 10. A torsion coil spring 18 that urges backward around the shaft center is attached, and a stopper 19 is provided so that the tip locking portion 17a is located at the center of the engaging recess 10.

Further, an engaging shaft portion 12 is provided on the upper end of the top link mast 11 projecting upward from the front portion of the working machine 20, and engaging shaft portions 13 are provided on both sides of the lower portion, as shown in FIG. Engaging shaft portion 12, the engaging recessed portion 9, and engaging shaft portion 13
The engaging recess 10 and the engaging recess 10 are configured to be engageable and disengageable.

A method of connecting the working machine to the tractor in such a structure will be described with reference to FIGS. First,
The tractor 1 is positioned so as to match the direction of the working machine 20, the three-point link mechanism Y is lowered to move backward, and the engaging recessed portion 9 of the coupling device X and the engaging shaft portion 12 of the working machine 20 are made to match each other. The three-point link mechanism Y is raised and engaged. Next, the lower end of the working machine 20 moves away from the ground as it rises, and the working machine 2
0 is lifted and the working machine 2 is moved around the engaging recess 9 as a fulcrum.
0 rotates forward, as shown in FIG. 6, the hook 14 begins to push down so that the engaging shaft portion 13 enters the inside of the engaging recessed portion 10, and as shown in FIG. While the hook 14 is pushed down and abutted on the shaft abutting portion 17b of the locking body 17, the locking body 17 is rotated forward so that the engaging shaft portion 13 moves to the maximum position of the engaging recess 10 as shown in FIG. Enter deep inside. At this time, the hook 14 is biased by the spring 16 toward the first rotation position A, and the engagement shaft portion 13 is prevented from being disengaged from the engagement recess 10, and the work machine 20 is connected to the tractor 1. Ends. The locking body 17 is rotated forward by the weight of the working machine 20 acting on the engaging shaft portion 13, and the shaft abutting portion 17b of the locking body 17 and the engaging shaft portion 1 are rotated.
The contact state of 3 is maintained by the biasing force of the torsion coil spring 18.

Next, a method for removing the working machine from the tractor will be described. First, turn the turning lever 15 to the first turning position A.
To the second rotation position B. Next, the three-point link mechanism Y of the tractor 1 is lowered to move the working machine 20.
When the bottom of the hook is grounded, as shown in FIG.
Rotates rearward about the axis of the connecting pin (support shaft) 7, the locking body 17 also rotates rearward by the biasing force of the torsion coil spring 18, and the rotation is stopped by the stopper 19. When the turning lever 15 is turned back in the direction of the first turning position A and returned (when the hand is released, it is returned by the spring 16), the tip end locking portion 17a of the locking body 17 is engaged with the engaging shaft portion 13.
The outer peripheral surface of the engaging shaft 13 comes into contact with the outer peripheral surface in the axial direction and is fixed at that position, and the engaging shaft portion 13 is in a state in which it can be disengaged from the inside of the engaging concave portion 10.

When the tractor 1 is advanced under the above-mentioned condition, the engaging shaft portion 13 is completely disengaged from the inside of the engaging concave portion 10, and as shown in FIG.
Turns from the second turning position to the first turning position and returns,
The three-point link mechanism Y descends so that the engagement shaft portion 12 moves into the engagement recess 9
Therefore, the removal of the work implement 20 is completed.

[0014]

Since the present invention is configured as described above, it has the following effects. First, when the work implement is disengaged, the hook is fixed so that the engaging shaft can be disengaged automatically by the locking body provided on the hook simply by rotating the hook to the second rotation position and releasing it. The hook returns to its original position when it is released, and when removing the work implement connected to the tractor and connecting it to the tractor again, it is possible to connect without operating the hook. You can do it. Further, since the hook is provided with the locking body, the structure is a simple and compact disengagement release mechanism, and the positional relationship of the coupling device is clarified, so that the design and manufacture can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a working machine is mounted on a tractor.

FIG. 2 is a side view of the work implement connecting device and the work implement of the present invention.

FIG. 3 is a rear view of the work implement connecting device of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a side view showing a state in which the hook engages with the engagement shaft portion and is in the second rotation position.

FIG. 6 is a side view showing a state where the engaging shaft portion is disengaged from the hook and the hook is in the first rotation position.

FIG. 7 is a side view showing a state where a hook is provided between a first rotation position and a second rotation position.

FIG. 8 is a bottom view of FIG.

FIG. 9 is a bottom view of FIG.

[Explanation of symbols]

 X Coupling device for working machine Y Three-point link mechanism 6 Coupling support member 7 Coupling pin 8 Coupling frame 9 Engagement recess 11 Coupling arm 13 Engaging shaft part 14 Hook 15 Rotating lever 16 Spring 17 Locking body 17a Tip locking part 17b Shaft contact portion 18 Torsional coil spring 19 Stopper 20 Working machine

Claims (1)

[Claims] 1. A pair of left and right engaging recesses 10 and engagement / disengagement between the left and right engaging recesses 10 between a rear part of a three-point link mechanism Y attached to a rear part of a tractor 1 and a front part of a working machine 20. An engaging portion having a pair of left and right engaging shaft portions 13 engaged with the engaging recess portion 10 is provided, and the engaging shaft portion 13 is allowed to engage with the engaging recess portion 10. Engaging shaft portion 13
And the engaging shaft portion 13
So that the engaging shaft portion 13 can move between a second rotation position B that allows the member to disengage from the engaging recess portion 10.
In the coupling device X of the working machine, which is provided with a pair of left and right rotatable hooks 14 on the engaging portion and a spring 16 for urging the hooks 14 toward the first rotational position A, the hooks 14 are detached at the time of disengagement. Is locked at the second rotation position B, and
A coupling device for a working machine, characterized in that a hooking body (17) for unlocking the hook (14) is provided on the hook (14) in response to disengagement of the engagement shaft portion (13) from the engagement recessed portion (10).