JPH0448645Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work implement coupling device for connecting a tractor and a work implement.

Conventionally, a three-point linkage mechanism has been used to connect a tractor and a working machine. A cantilever type connecting pin is provided at the rear end of the lower link of this three-point link mechanism, and the pin is inserted into a receiving member on the working machine side.

Since the connecting pin was supported by the lower link in a cantilevered manner, its strength was unstable.

Therefore, it has been proposed to improve the shortcomings of the cantilever type by using a connecting pin at the end of the connecting body that connects the left and right lower links (for example,
-182306, JP-A-54-24705, or Japanese Utility Model Publication No. 57-34882).

However, in the case where the end of the lower link connecting body is a connecting pin, the connecting body is a straight rod-shaped body, so depending on the type of work equipment, the tractor's PTO axis and the input of the work equipment may There was a risk of interference with the transmission shaft that connects the shaft.

Therefore, when the transmission shaft and the coupling body interfere with each other, it is conceivable to bend the coupling body so that the coupling body detours around the transmission shaft.

However, if the connecting body is bent and formed, the connecting pin becomes nearly cantilevered, and its strength is unstable.

Therefore, an object of the present invention is to provide a work equipment coupling device with improved coupling strength. Therefore,
The feature is that in a device that removably connects a working machine through a pair of left and right connecting rods provided on a tractor, a connecting pin with a horizontal axis in the left and right direction is attached to the end of each connecting rod. The working machine is provided with a pair of left and right receiving members, and the ends of the connecting rod are connected by a connecting member that bypasses the lower part, and the working machine is provided with a pair of left and right receiving members, and the working machine is provided with a pair of left and right receiving members. Each of the connecting pins has a pair of left and right recesses for respectively receiving the protruding parts at both ends of the connecting pin, and when the protruding parts at both ends of the connecting pin are fitted into the respective recesses, the inner parts of the protruding parts at both ends of the connecting pin are fitted. Each receiving member is provided with a locking member that engages with at least one of the protrusions to prevent the connecting pin from separating from the recess.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Figs. 1 to 4, 1 is an agricultural tractor, 2 is a rotary tiller, and both are similar to the tractor 1.
They are detachably connected via a three-point link mechanism 3 provided in the.

The three-point linkage mechanism 3 has a pair of left and right connecting rods 4, 4 as lower links, and the front ends of the connecting rods 4 are pivotally connected to the tractor body so as to be vertically movable. A connecting pin 5 is inserted into and supported at the rear end of the connecting rod 4 so that both ends protrude in the left-right direction in a horizontal axis position. The connecting pin 5 is prevented from coming off in the axial direction by holding the connecting rod 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 member constituted by the connecting plate 9 and the bracket 8. A circumferential groove 12 is formed in the protruding end portion of the connecting pin 5 on the outer side in the left-right direction.

The rotary tiller 2 has a power receiving gearbox 13 in the center in the left-right direction, and support arms 14 are provided on both left and right sides of the gearbox 13. This support arm 14 is provided with a conventional pin insertion type lower link attachment piece 15 projecting forward, and the rear end of the attachment piece 15 is a rotary cover attachment portion 16 . This mounting piece 15
The front connecting pin 5 is attached to the side support arm 14 of the
A receiving member 17 for removably receiving is provided in a removable manner.

This receiving member 17 is fixed to the support arm 14 by sandwiching the support arm 14 with the half flange bracket 18. A half spacer 19 is interposed between the bracket 18 and the support arm 14.

The receiving member 17 is provided with a pair of left and right receiving pieces 20 and 21 that protrude forward, one of which protrudes more forward than the other. Hereinafter, this forwardly protruding receiving piece 20 will be referred to as the main receiving piece 20, and the other one will be referred to as the sub-receiving piece 21. In the illustrated example, the sub-receiving piece 21 is located on the mounting piece 15 side, and the pin 23 inserted into the pin insertion hole 22 of the mounting piece 15 is inserted into the pin insertion hole 24 opened in the sub-receiving piece 21. This prevents the receiving member 17 from rotating around the support arm 14.

Main receiving piece 20 located outside of sub-receiving piece 21
and the sub-receiving piece 21 has receiving recesses 25, 2 that open toward the front to receive the connecting pin 5.
6 is provided. The recess 26 of the sub-receiving piece 21 is a semicircular or smaller arc-shaped recess. The recessed portion 25 of the main receiving piece 20 that projects forward from the sub-receiving piece 21 has a guide portion 28 that expands in the vertical direction via a parallel portion 27 in front of the semicircular portion. The rear end surfaces of both the recesses 25 and 26 are located on the same straight line in the left-right direction. The front end of the main receiving piece 20 is bent outward. Both ends of the connecting pin 5 fit into both the recesses 25 and 26.

A pair of brackets 29 are provided on the outer surface of the main receiving piece 20 and near the parallel portion 27, vertically opposing each other with the parallel portion 27 interposed therebetween, and each bracket 29 is provided with an insertion hole 30 that passes through the bracket 29 vertically.

A cylindrical member 31 is provided on the upper surface of the upper bracket 29, and a locking member 32 is inserted into the cylindrical member 31 so as to be vertically movable. A spring seat 33 is provided on the inner circumferential surface of the upper end of the cylindrical member 31, and is located below the spring seat 33 and
A spring seat 34 is also provided on the inner locking member 32, and a compression spring 35 is interposed between both spring seats 33, 34. Therefore, the locking member 32 is always urged downward.

When the spring 35 is fully extended and the lower spring seat 34 is in contact with the upper bracket 29, the lower part of the locking member 32 penetrates the parallel part 27 on the side of the parallel part 27, and the lower part It is inserted into the insertion hole 30 of the bracket 29.
In this state, the circumferential groove 12 of the connecting pin 5 fitted into the recesses 25 and 26 comes into contact with the lower part of the locking member 32, and the connecting pin 5 is prevented from separating from the recess.

When the spring 35 is compressed and the locking member 32 is moved upward, the lower end of the locking member 32 is located above the parallel portion 27 and the concave portion 2 of the connecting pin 5
Acceptance and defection to 5 are allowed.

In order to move the locking member 32 upward, a handle 36 is provided at the top of the locking member 32 and projects upward from the cylinder member 31.

At a position that allows the connection pin to be received,
In order to maintain this state, a locking member 37 made of an elastic member that engages with the lower end surface of the locking member 32 is provided. This locking member 37 is connected to the main receiving piece 20.
The lower end of the helical spring is wound around a pin 38 projecting from the outer surface of the bracket 29, and the upper end of the spring is engaged with the lower surface of the lower bracket 29. It engages the lower end of member 32.

When the connecting pin 5 enters into the recess 25, the connecting pin 5 presses the locking member 37, and the locking member 37 is deformed by the pressing force, and the locking member 37 is deformed and engaged with the locking member 32. cancel the connection. When releasing this, make sure that the connecting pin 5 is already in the recess 2.
5 is fitted. This disengagement causes
The locking member 32 moves downward and prevents the connecting pin 5 from separating from the recess.

To release the connection between the connection pin 5 and the recess 25, the locking member 32 may be moved upward using the handle 36.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the locking member may lock on both ends of the connecting pin.

Furthermore, it is easily possible to provide the connecting pin on the working machine side and the receiving member on the connecting rod side. Further, the direction in which the connecting pin and the receiving recess are fitted is not limited to the front-back direction, but may be in the up-down direction. Furthermore, the locking member may fall under its own weight without being biased by a spring. Further, as shown in FIG. 5, if a flange guide member 40 having an inclined guide surface 39 is provided on the side of the connecting pin 5, fitting with the receiving member 17 will be facilitated. The flange guide member 40 may be fixed to the connecting pin 5 or may be rotatable.

As detailed above, 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 members, so that the three-point support structure is strong. Therefore, it has superior strength compared to conventional cantilever pins.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and Fig. 1 is a plan view;
Figure 2 is an enlarged plan view of the main part, Figure 3 is Figure 2-
A line sectional view, FIG. 4, a line sectional view taken from FIG. 2, and FIG. 5 are enlarged plan views of main parts showing other embodiments. 1... Tractor, 2... Working machine, 4... Connecting rod, 5... Connecting pin, 8, 9... Connecting member, 17
... Receiving member, 25, 26 ... Recess, 32 ... Locking member.

Claims (1)

[Claims for Utility Model Registration] In a device for removably connecting a working machine 2 via a pair of left and right connecting rods 4 provided on a tractor 1, the end portions of each of the connecting rods 4 have a left-right horizontal axis posture. A connecting pin 5 is supported at its midpoint and protrudes from both ends, and the ends of the connecting rod 4 are connected by connecting members 8 and 9 that bypass the lower part. A receiving member 17 is provided, and each of the receiving members 17 has a pair of left and right recesses 25 and 26 that respectively receive the protruding portions at both ends of each of the connecting pins 5, and the protruding portions at both ends of the connecting pins 5 are Each recess 2
5 and 26, the locking member 3 engages with at least one of the protrusions at both ends of the connecting pin 5 and prevents the connecting pin 5 from separating from the recess.
2 is provided on each of the receiving members 17.