JPH0321121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a work machine coupling device for detachably coupling a tractor and a work machine.

<Prior art> As such a coupling device, for example,
The one described in Publication No. 137509 (Utility Application No. 56-23808) is known.

In the conventional system described above, one automatic coupling mechanism is provided at each end of the coupling rod provided on the tractor, and a cantilevered coupling pin is provided on the work machine side to detachably connect the two. It was hot.

<Problems to be Solved by the Invention> According to the above-mentioned conventional coupling device, since the coupling was made using only one automatic coupling mechanism, the coupling part would be strained and worn out by the lateral load of the work machine. There was a problem.

<Means for Solving the Problems> In order to solve the above problems, the present invention takes the following measures. That is, the features of the present invention are as follows:
In a device for removably connecting a working machine via a pair of left and right connecting rods provided on a tractor, a connecting pin with a horizontal axis in the left-right direction is provided at each end of the connecting rod so as to protrude from both ends; The work machine is provided with a pair of left and right receiving parts that receive the protruding parts at both ends of the connecting pin, and one of the receiving parts has a main locking device that prevents vertical and longitudinal movement of one of the protruding parts of the connecting pin when it is received. is provided, and the other receiving portion is provided with a simple locking device that prevents the other protruding portion of the connecting pin from moving back and forth when the other protruding portion is received.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings. In Figures 1 to 4, 1 is an agricultural tractor;
is a rotary tiller, and the two are detachably connected via a three-point linkage mechanism 3 provided on the tractor 1.

The three-point link mechanism 3 has lower links 4, 4, which are a pair of left and right connecting rods, and the front end of the lower link 4 is pivotally connected to the tractor body so as to be vertically movable. A connecting pin 5 is provided at the rear end of the lower link 4.
is inserted and supported in a horizontal axis position so that both ends protrude in the left-right direction. The connecting pin 5 is prevented from coming off in the axial direction by holding the lower link 4 between the flange portion 6 and the knock pin 7.

An L-shaped bracket 8 is provided at one end of the connecting pin 5, and the pair of left and right brackets 8 are connected by a connecting plate 9. The bracket 8 or the connecting plate 9 is provided with an elongated hole 10 having a long axis in the left-right direction, and the bracket 8 and the connecting plate 9 are fixed by bolts 11 inserted through the elongated hole 10 so that the dimensions in the left-right width direction can be adjusted freely. has been done. The distance between the pair of left and right connecting pins 5 is maintained constant by the connecting plate 9 and the bracket 8. A sleeve 12 is fitted over the protruding end of the connecting pin 5 on the outer side in the left-right direction, and a circumferential groove 13 is formed in the outer peripheral surface of the sleeve 12.

The rotary tiller 2 has a power receiving gearbox 14 in the center in the left-right direction, and support arms 15 are provided on both left and right sides of the gearbox 14. A main bracket 16 and a sub-bracket 17 are fixed to the support arm 15 and project forward. The main bracket 16 is provided with a front-open fitting groove 18 for receiving the outer end of the connecting pin 5. The sub-bracket 17 is also provided with a front-open engagement recess 19 for receiving the inner end of the connecting pin 5. However, the above main and sub bracket 1
6 and 17 constitute a pair of left and right receiving portions 20 and 21 that receive both ends of the connecting pin 5.

The receiving portion 20 on the side of the main bracket 16 is provided with a main lock device 22 having the following configuration.
That is, a pair of upper and lower support frames 23, 23 are protruded from the outer surface of the main bracket 16 via the fitting groove 18.
A cylindrical body 24 is erected on the upper support frame 23, and a lock pin 25 is attached to the cylindrical body 24 between the pair of upper and lower support frames 2.
Vertical through holes 26, 26 provided in 3, 23
It can be inserted freely. The lock pin 25 is always urged downward by a spring 27 built into the cylindrical body 24. The handle 2 is attached to the upper end of the lock pin 25.
8, the lock pin 25 can be moved upward by lifting the handle 28, and by engaging the lock pin 28 with the stopper 29 in the upper position, the lower end of the lock pin 25 is moved to the upper position of the fitting groove 18. Retained. The lock pin 25 can also be held in the normal position by engaging one end of a coil spring 30 provided on the outer surface of the main bracket 16 with the lower end of the lock pin 25.

On the other hand, the receiving portion 20 on the side of the sub-bracket 17 is provided with a simple locking device 31 having the following configuration. That is, a lock plate 32 is pivotally supported on the inner surface of the sub-bracket 17 so as to be vertically movable. An unstable switching spring 33 is provided between the lock plate 32 and the sub-bracket 17.
3, the lock plate 32 is held in the upper rotational position and the lower rotational position. Lock plate 32
is provided with a fitting recess 34 that is open to the front in the upward rotation position.

In addition, 35 is a flange guide member, which is fitted onto the outer protrusion of the connecting pin 5, and which is attached to the inclined guide surface 36.
, which guides the connecting pin 5 in the left-right direction by slidingly contacting the main bracket 16 during the connecting operation.

To explain the operation of the above work equipment coupling device, the lock pin 25 is moved upward, the coil spring 30 is engaged with the lower end of the lock pin 25 to maintain the position, and the lock plate 32 is rotated upward to maintain the position. It is held by a spring 33. Thus, the fitting groove 18 of the main bracket 16 and the engagement recess 19 of the sub-bracket 17 are opened in the front.

In this state, the connecting pin 5 of the lower link 4
The tractor 1 and the rotary tiller 2 are brought close together so that the rotary tiller 2 is received in the fitting groove 18 and the engagement recess 19.

As the connecting pin 5 is received into the fitting groove 18, the connecting pin 5 pushes the coil spring 30. However, the spring 30 and the lock pin 25
is disengaged, and the lock pin 25 is moved downward by the other spring 27 to engage the front side surface of the connecting pin 5 and fit into the through hole 26 of the lower support frame 23, causing the connecting pin 5 to move forward. to regulate. In this state, the connecting pin 5 is prevented from moving back and forth and up and down.

Simultaneously with the operation of the lock pin 25, the fitting recess 34 of the lock plate 32 of the sub-bracket 17 is opened.
is also pushed by the connecting pin 5, so the lock plate
32 rotates downward. This downward rotation causes the fitting recess 34 to embrace the connecting pin 5,
This state is a position beyond the dead point of unstable switching caused by the spring 33. In this state, the connecting pin 5 is prevented from moving in the front-rear direction.

Thus, both ends of the connecting pin 5 engage with the fitting groove 18 and the engaging recess 19, and are prevented from moving up and down and back and forth by the lock pin 25 and the lock plate 32. are fully concatenated.

This disconnection is carried out by moving the handle 28 upward to engage the stopper 29 and rotating the lock plate 32 upward by hand to open the front side of the coupling pin 5.

<Effects of the Invention> According to the present invention, the intermediate part of the connecting pin is supported by the connecting rod, and the protruding parts at both ends are supported by the receiving parts, so the strength is superior to that of the conventional cantilever type. It becomes something.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, and FIG. 1 is a plan view;
2 is a sectional view, FIG. 3 is a sectional view taken along line A--A in FIG. 2, and FIG. 4 is a view taken along arrow B in FIG. 1... Working machine, 4... Connecting rod, 5... Connecting pin, 20... Receiving part, 21... Receiving part, 22...
Main lock device, 31...simple lock device.

Claims (1)

[Claims] 1. In a device for detachably connecting a working machine via a pair of left and right connecting rods provided on a tractor,
A connecting pin with a horizontal axis posture in the left-right direction is provided at each end of the connecting rod so as to protrude from both ends, and the working machine is provided with a pair of left and right receiving portions for receiving the protruding portions at both ends of the connecting pin, one receiving portion. is equipped with a main locking device that prevents the vertical and longitudinal movement of one protruding part of the connecting pin when it is received, and the main locking device that prevents the forward and backward movement of the other protruding part of the connecting pin when it is received. A work equipment coupling device characterized by being provided with a simple locking device for preventing.