JPS60259104A - Hitch apparatus of agricultural tractor and working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coupling device for an agricultural tractor and a working machine.

(Prior Art) Conventionally, it is known that a three-point attachment mechanism consisting of one top link and two lower links is provided at the rear of an agricultural tractor, and a work implement is detachably attached via the three-point attachment mechanism. be.

(Problems to be Solved by the Invention) The above-mentioned known device had a defect in that it could not be attached or detached by the operation of a single operator of an agricultural tractor.

(Means for Solving the Problem) Therefore, the present invention provides a three-point attachment mechanism 3 consisting of one top link 4 and two lower links 5 at the rear of an agricultural tractor l. The rear end portions of the top link 4 and the lower link 5 are connected at a predetermined interval by a connecting member 11, and the upper center of the connecting member 11 is provided with an upper engaging member. Lower engagement shafts 15 are provided on both left and right sides of the lower portion of the shaft 14, and a substantially inverted U-shaped upper flap 17 is provided at the front end of the upper portion of the work implement 16 to engage the upper retaining shaft 14 from below. A horizontal engagement groove 26 with an open front side is provided on both sides of the front end of the lower part, and a movable hook 18 is provided in the engagement groove 26, which is always biased to the closed position by a spring 30. When the engaging shaft 14 is engaged with the upper hook 17 and the working implement 16 is lifted up, the lower part of the working implement 16 is configured to rotate forward by its own weight, and the movable hook 18 is in contact with the lower engaging shaft 15. Then, the connecting device for an agricultural tractor and a working machine is configured such that it automatically opens against the elasticity of the spring 30 and the lower engagement shaft 15 engages with the engagement groove 26.

(Example) To explain using example diagrams, l is an agricultural tractor,
It has a front wheel and a rear wheel 2, and the so-called 3 is installed at the rear of the agricultural tractor l.
A point attachment mechanism 3 is provided. The three-point mounting mechanism 3 is formed of one top link 4, two wooden lower links 5, two lift arms 6, two rods 7, etc. The top link 4 is extendable and retractable with a turnbuckle, the lift arm 6 is moved up and down about a hydraulic rotation axis 9 by a hydraulic device 8 attached to the rear of the agricultural tractor 1, and one end of the rod 7 is attached to the lift arm 6. The lower end of the rod 7 attached to the tip of the arm 6 is pivoted approximately midway between the front and rear of the lower link 5.

The line connecting the rear ends of the top link 4 and the lower link 5 is adjusted by adjusting the turnbuckle of the top link 4. When the lift arm 6 is moved up and down by the hydraulic device 8, the height of the lower link 5 can be adjusted. 10 is a PTO shaft protruding from the rear of the agricultural tractor l.

11 is a connecting member that connects the three-point attachment mechanism 3 and various working machines attached to the three-point attachment mechanism 3;
The rear end of the top link 4 is connected to the upper connecting shaft 12 at the center of the upper part of the connecting member 11, and the lower connecting shafts 13 on both the left and right lower sides of the connecting member 11
．． The rear ends of the lower links 5 are rotatably attached to each of the lower links 5 and 13.

The upper connecting shaft 12 of the connecting member 11 projects in the axial direction on both sides to form an upper retaining shaft 14.14, and the lower connecting shafts 13.13 each project in the axial direction on the outside. A lower retaining shaft 15.15 is formed, and a working machine 16 is attached to the -1 part retaining shaft 14 and the lower retaining shaft 15 to be attached to an agricultural tractor l to be described later for various operations.

The working machine 16 and the connecting member 11 are connected by a two-part hook 17 and an upper engagement shaft 14. This is done by the engagement between the lower engagement groove 26 and the lower retaining shaft 15. The upper hook 17 is attached to the work machine 16
21.21 is an inverted U-shaped hook formed at the other end of the upper engaging rod 20 whose one end is fixed to the frame 19 of This is a guide edge that guides when the upper hook 17 is engaged.

The movable hook 18 that closes the lower engaging groove 26 of the working machine 16 connected to the lower retaining shaft 15 of the connecting member 11 is connected to the fourth movable hook 18.
As shown in the figure, it is formed into a fishhook shape, and the fishhook-shaped root portion is pivoted 22 to the lower engagement rod 23.23.

The tip end of the lower engaging rod 23.23 is formed into a fork 25 as shown in FIG. 6, and the movable hook 18 is pivoted 22 between the fork 25. The forked portion 25 is formed with a horizontal engagement groove 26 that is open on the side of the agricultural tractor I.

One end of a rotating rod 29 is rotatably attached to the outer surface of the curved portion 27 of the movable hook 18, a spring 30 is wound around the rotating rod 29, and the other end of the rotating rod 29 is attached to the lower part. It is inserted into a shaft 31 rotatably attached to the engagement rod 23. That is, when the movable hook 18 is in the engaged position, it is always urged by the spring 30 and comes into contact with the stopper 32 to stop at the closed position. Furthermore, when the shaft is in the closed position as shown in FIG. 5, the shaft 28 is on the work machine 16 side from the line connecting the shaft 22 and the shaft 31, so the movable hook 18 is always connected to the stopper 33 on the work machine 16 side. remain in contact and in the non-occluded position.

35 is a guide edge similar to the guide edge 21, and the lower engagement shaft 1
5 at each outer end.

A rotating rotor 36 is attached to the lower end side of the frame 19, and the rotating rotor 36 is connected to the PTO shaft IO and rotates. 37 is a rear cover, which moves up and down when operating the operating rod 3B to level the floor.

(effect) Next, we will discuss the effect.

A connecting member 11 is arranged at the rear of the agricultural tractor l, the rear part of the top link 4 is pivotally attached to the upper connecting shaft 12 at the upper part of the connecting member 11, and the rear part of the lower link 5 is connected to the lower connecting shaft 13 at the lower part of the connecting member 11. The height of the upper engagement shaft 14 is set by the upper hook 17.
If the lower engagement shaft 15 is set at a slightly lower position and then retreated as it is, the lower engagement shaft 15 will not engage the engagement groove 26 as shown in FIG.
The upper retaining shaft 14 advances to the position where the -L luff 1 engages.

In this state, when the hydraulic device 18 is operated to move the lid armuro -L, the lower link 5 is pulled up by the rod 7, so the upper engagement shaft 14 moves upward and engages the upper hook 17 from below.

Furthermore, when the lift arm 6 is rotated upward, -1=
Since the holding shaft 14 acts to lift the entire working machine 16, the lower part of the working machine 16 moves to rotate toward the agricultural tractor l side, and the movable hook 18 closes the engagement groove 26.
The claw portion 34 strongly hits the lower engagement shaft 15 on the tractor I side. Then, against the elasticity of the spring 30, the claw portion 34 is raised to the extent that the lower engagement shaft 15 is lowered. In this state, when the engagement groove 26 further moves toward the agricultural tractor I, the claw portion 34 advances over the lower retaining shaft 15, the lower engagement shaft 15 engages with the engagement groove 26, and the claw portion 34 is returned to the state shown in FIG. 4 due to the elasticity of the spring 30. To remove the work implement 16 in which the above-mentioned part engaging shaft 14 and lower retaining shaft 15 are engaged, get off the agricultural tractor l, rotate the movable hook 18 with your fingertips so that it hits the stopper 33, and then remove the claw part. 34 is in the open state, and in this state, when the hydraulic device 8 is operated to lower the lift arm 6, the lower engagement shaft 15 is pulled out from the engagement groove 26, and the L portion retaining shaft 14 is removed from the upper hook 17. It comes off and can be easily released.

(Effects) Conventionally, it is known that a three-point attachment mechanism consisting of one top link and two lower links is provided at the rear of an agricultural tractor, and a work implement is detachably attached via the three-point attachment mechanism. . The above-mentioned known device had a defect in that it could not be attached or detached by the operation of a single operator of an agricultural tractor.

However, in the present invention, a three-point attachment mechanism 3 consisting of one top link number and two lower links 5 is provided at the rear of an agricultural tractor l, and a working machine is detachably attached via the three-point attachment mechanism 3. The rear ends of the top link 4 and the lower link 5 are connected at a predetermined interval by a connecting member 11, and an upper engagement shaft 14 is provided at the center of the upper part of the connecting member 11.
A lower engaging shaft 15 is provided on both left and right sides of the lower part, and a lower front end of the roughly inverted U-shaped -L part lug 1 is provided at the upper front end of the working machine 16 to engage the upper retaining shaft 14 from below. A horizontal engagement groove 26 with an open front end is provided on both sides, and a movable hook 18 is provided in the engagement groove 26, which is always biased to the closed position by a spring 30. By engaging the mating shaft 14 with the upper hook 17, the work machine 1
6, the lower part of the work implement 16 is configured to rotate forward by its own weight, and the movable hook 18 is attached to the lower retaining shaft 15.
A coupling device for an agricultural tractor and a working machine is configured such that when the lower retaining shaft 15 comes into contact with the retaining groove 26, the lower retaining shaft 15 automatically opens against the elasticity of the spring 30 and engages with the retaining groove 26. Therefore, the rear part of the top link 4 and the rear part of the lower link 5 at the rear of the agricultural tractor l are each pivoted to the connecting member 11, and in this state, the agricultural tractor l is mounted on the tower,
Operate the hydraulic device 8 to move the L part engagement shaft 14 to the one part hook 1.
7, and then retreats as it is, and the F section engaging shaft 14 advances to a position where it engages with the upper hook 17, and the upper engaging shaft 14 moves upward and engages with the upper hook 17 from below.

Further, when the lift arm 6 is rotated upward, the upper engagement shaft 14 acts to lift the entire work implement 16, so that the lower part of the work implement 16 moves to rotate in the direction of the agricultural tractor. The claw portion 34 of the movable tool 2 18 that closes the movable tool 26 strongly hits the lower engagement shaft 15 of one example of a tractor, and the claw portion 34 rises against the elasticity of the spring 30. When the agricultural tractor moves toward the l side, the lower engagement shaft 15 engages with the engagement @26. When removing the work implement 16 in which the lower retaining shaft 15 and the lower engaging shaft 15 are engaged, rotate the movable hook 18 with your fingertips so that it hits the stopper 33 to open the claw portion 34. In this state, when the hydraulic device 8 is operated to lower the lift arm 6, the lower engagement shaft 15 comes out of the engagement groove 26, and the lower retaining shaft 15
can be removed from the upper hook 17 and released easily.

[Brief explanation of drawings]

Figure 1 is an overall side view, Figure 2 is an overall side view when the engagement shaft and upper hook are engaged, Figure 3 is a front view of the connecting member, and Figure 4 is an overall side view.
5 is a state diagram showing the lower hook in the engaged position, FIG. 5 is a state diagram showing the lower tool 2 in the non-engaged position, and FIG. 6 is an enlarged plan view of the main part. Explanation of symbols■...Agricultural tractor, 2...Rear wheel, 3...Three-point attachment mechanism, 4.) Twin link, 5...Lower link,
6...Lift arm, 7...Rod, 8...Hydraulic device, 9...Hydraulic rotation axis, lO...PTO axis, 11
...Connection member, 12...-L portion connection shaft, 13...
Lower connecting shaft, 14... Upper retaining shaft, 15... Lower engaging shaft, 16... Work equipment, 17... Upper hook, 1
8... Movable hook, 19... Frame, 20...
Upper engaging rod, 21... Guide edge, 22... Pivoting, 23
... lower engagement rod, 24 ... space, 25 ... two-pronged part, 26 ... engagement groove, 27 ... curved part, 28 ... pivoting, 29 ... rotation Rod, 30...Spring, 31.
... Shaft, 32 ... Stopper, 33 ... Stopper, 34 ... Claw portion, 35 ... Guide edge, 36 ... Rotating rotor, 37 ... Rear cover, 38 ... Operation rod. Patent applicant Suzuki Forging Co., Ltd. and one other person

Claims (1)

[Claims] A three-point attachment mechanism 3 consisting of one top link 4 and two lower links 5 is provided at the rear of an agricultural tractor l, and a working machine is detachably attached via the three-point attachment mechanism 3. The rear end portions of the top link 4 and the lower link 5 are connected at a predetermined interval by a connecting member 11, and an upper retaining shaft 14 is provided at the center of the L portion of the connecting member 11, and lower engaging shafts are provided on both left and right sides of the lower portion. 15 respectively, and -L of the working machine 16 is provided.
The front end of the section has a substantially inverted U that engages the upper engagement shaft 14 from below.
A horizontal groove-shaped retaining groove 26 which is open on the front side is provided on both sides of the lower front end of the upper hook 17 in the shape of a letter, and the retaining groove 1I
II 26 is provided with a movable hook 18 that is always urged to the closed position by a spring 30, and the upper engagement shaft 14
When the upper hook 18 is engaged with the upper hook 17 and the working implement 16 is lifted up, the lower part of the working implement 16 is configured to rotate forward by its own weight, and when the lower retaining shaft 15 comes into contact with the movable hook 18, A coupling device for an agricultural tractor and a working machine configured to automatically open against the elasticity of a spring 30 so that the lower retaining shaft 15 engages with the engagement groove 26.