JPS6243841Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a towing device used when a trailer or the like is towed by a tractor.

In a tractor, a tow hitch is provided at the lower rear end of the tractor body, and a trailer or the like is connected to the tow hit so that the tractor can be towed. However, in the past, the trailer was simply towed, and when loading and unloading cargo, it was not possible to lift the front of the trailer upwards and lower the rear of the loading platform; was difficult.

The present invention was provided with the aim of solving these conventional problems, and its feature is that a three-point linkage mechanism is installed at the rear of the tractor body that can be raised and lowered using a hydraulic system. In the tractor equipped with the above-mentioned tractor, a towing frame is detachably attached to the rear end of the three-point linkage mechanism, a pair of left and right support brackets are provided on a support member provided laterally to the towing frame, and a pair of left and right support brackets are provided between the support brackets. A traction bracket is provided rotatably around the horizontal axis, and a vertical hit pin for connecting the towed rod is provided on the traction bracket so as to be perpendicular to the axis of the horizontal axis.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 to 3, 1 is a tractor body, 2 is a hydraulic system mounted on the rear of the tractor body, and has a pair of left and right lift arms 3. Reference numeral 4 denotes a three-point link mechanism mounted on the rear of the tractor body 1, which includes a top link 5 and a pair of left and right lower links 6, each of which can be raised and lowered by a lift arm 3 via a lift rod 7. Reference numeral 8 denotes a triangular towing frame, the upper end of which is connected to the top link 5 by a mounting pin 9, and the lower end of both sides connected to the top link 5 by mounting pins 10.
The lower links 6 are removably connected to each lower link 6, respectively. A support member 11 is horizontally suspended in the middle portion of the tow frame 8 so as to connect the left and right sides, and a pair of left and right support brackets 12 are protruded from the support member 11. Reference numeral 13 denotes a traction bracket that opens front and rear, and is rotatably supported between the support brackets 12 by a pair of left and right horizontal shafts 14. The traction bracket 13 has a hit pin 16 that can be inserted into and removed from the pin hole 15, and this hit pin 16 is attached to the horizontal shaft 14.
It is provided in a direction substantially perpendicular to the axis of the. 17 is a trailer, 18 is a loading platform, and 19 is a towed rod, the ring-shaped connecting portion 20 at the front end of which is connected to the towing bracket 13 by a hitch pin 16.

In the above configuration, when transporting a load such as a combine harvester using the trailer 17, the towing frame 8 is attached to the three-point linkage mechanism 4, and the towing bracket 13 is attached to the towing frame 8.
Connecting portion 2 of trailer 17 with hitch pin 16.
Concatenate 0. Next, when the hydraulic system 2 is operated in the upward direction, the three-point linkage mechanism 4 and the towing frame 8 rise via the lift arm 3 and lift rod 7, so the front side of the trailer 7 is lifted and the loading platform 1
8 tilts backwards. At this time, the traction bracket 13 rotates around the horizontal axis 14, so in terms of operation,
No problems will occur. If the loading platform 18 is tilted backward, it becomes easier to load and unload cargo onto the loading platform 18. After loading the cargo, the hydraulic system 2 is lowered, the trailer 17 is placed in a substantially horizontal state, and the trailer 17 is towed by the tractor body 1, and the same towing work as with a conventional tow hit is possible.

Although the above embodiment uses a dedicated towing frame 8, the following method may be used. That is, as shown in FIG. 4, a female connecting frame 21 is formed by combining inwardly-opening U-shaped members in a mountain shape, and the female connecting frame 21 is removably fitted from the lower side. The male type connecting frame 22 is provided, and the female type connecting frame 21 is connected to the work machine 2.
The male connecting frame 22 is attached to the three-point link mechanism 4 side on the 3 side, and the male connecting frame 22 is fitted from below to the female connecting frame 21 when the work machine 23 is attached. Although there is a work machine coupling device, the male mounting frame 22 of this coupling device may be used as the traction frame 8, and the support member 11, traction bracket 13, etc. may be provided on this. The upper and lower ends of the support bracket 12 are fixed to the male connection frame 22 and the support member 11 by welding or the like, respectively. 26 is a top link bracket, 24 is a lower link bracket, and 25 is a guide roller.

According to the present invention, the towing frame is detachably attached to the three-point linkage mechanism, and the towing bracket is provided with a hitch pin, so the towing bracket can be moved up and down using the hydraulic system mounted on the tractor. Therefore, when loading and unloading cargo onto a trailer, the loading platform of the trailer can be lowered backwards, making the work extremely easy. In addition, a pair of support brackets is provided on the lateral support member of the traction frame, and the traction bracket is provided between the pair of support brackets so as to be rotatable around the horizontal axis, so that the traction bracket can be moved up and down using a hydraulic device. At times, the towed rod rotates the towing bracket about its transverse axis, so that the towing bracket is not strained.
Furthermore, since the hit pin in the vertical direction of the traction bracket is provided so as to be approximately perpendicular to the axis of the horizontal axis, even when the traction bracket rotates around the horizontal axis, the connection position with the towed rod does not change. There is an advantage that the traction point is approximately constant.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a rear view of the towing frame, FIG. 3 is an enlarged view of the main parts, FIG. 4 is a cutaway side view showing another embodiment, and FIG.
The figure is a cross-sectional side view of the same main part, and FIG. 6 is a cross-sectional front view of the same main part. 1... Tractor body, 2... Hydraulic system, 4...
Three-point link mechanism, 8... Traction frame, 13... Traction bracket, 14... Horizontal shaft, 16... Hitch pin,
17... Trailer, 21... Female connection frame, 22...
...Male connecting frame.

Claims (1)

[Scope of utility model registration request] In a tractor equipped with a three-point link mechanism 4 that can be raised and lowered by a hydraulic device 2 at the rear end of the tractor body 1, towing frames 8 and 22 are detachably attached to the rear end of the three-point link mechanism 4, and A pair of left and right support brackets 12 are provided on a support member 11 provided laterally on the frames 8 and 22, and the support brackets 12
In between, a traction bracket 13 is provided rotatably around a horizontal axis 14, and a vertical hit pin 1 for connecting a towed rod 19 is attached to this traction bracket 13.
6 is provided so as to be perpendicular to the axis of the horizontal shaft 14.