JPS5923103Y2 - Structure of hitchi - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a hitch used when attaching a working implement such as a packet to a tractor.

Conventionally, working implements such as packets have been attached directly to a front loader attached to the front side of a tractor or to a link attached to the rear side of the tractor using pins.

However, when the working implement is attached directly with the pin in this way, it takes time and effort to replace the working implement, and the replacement work is extremely complicated.

Further, the working implements attached to the front and rear parts of the tractor are dedicated to the front and rear parts, respectively, and one working implement cannot be used for both the front and rear parts.

As a result, the operating rate of the working implements is extremely poor, and the purchaser must purchase each working implement for the front or rear of the tractor, which is extremely uneconomical.

This invention is an improvement on the above-mentioned drawbacks.
It is an object of the present invention to provide a structure for a hitch that allows the attachment and detachment of a working implement such as a packet to be extremely simple and easy, and also allows the working implement to be used for both the front and rear parts of a tractor. .

The configuration of the present invention will be described below with reference to the embodiments shown in the drawings.

In Fig. 1, reference numeral 1 denotes a lift arm that is pivotally attached to both sides of a tractor body (not shown), and 2 is a pair of hit bodies that are each pivotally attached to the tip of the lift arm 1 by a support shaft 2. A horizontal rod 4 having a hole 4' is installed between the hit bodies 2, 2.

If a hawk or the like is attached to the hole 4' of the horizontal rod 4, it can be used as a simple hawk pit.

As shown in Fig. 2, the hitch main body 2 is composed of two side plates 2a and 2b held opposite each other at a predetermined interval, and a cylindrical body 5 is fixedly fixed to the upper end of the side plate 5, and the outer surface of the hitch body 2 is fixed. A protruding boss portion 6 is formed, the uppermost end portion 7 is bent into a 71 shape, and a support piece 8 is provided at the lower end with a portion of the support piece 8 protruding outward. The front edge is formed into a slope part 9, and a hook part 10 is formed by cutting out a part of the upper edge.

Then, the tip of the piston rod 12 of the hydraulic cylinder 11 whose base end is pivotally connected to the intermediate plate 1' of the lift arm 1,
The hydraulic cylinder 1 is pivotally connected to the cylindrical body 5 of the hit body 2.
1 rotates the hitch body 2 about the support shaft 3.

Reference numeral 13 denotes a working device such as a packet, and as shown in FIG.
4a and 14b are fixedly installed.

The mounting plates 14a and 14b are arranged with a gap between them such that the hitch main body 2 can be fitted therein, and a hook portion 16 is formed on the inner surface of the upper end by fixing a locking plate 15.

Also, a mounting plate 14a. A pin 17 that is inserted into the hook portion 10 at the lower end of the hitch main body 2 is installed at the lower end of the hitch main body 2, and further, the boss portion 6 of the hitch main body 2 is inserted into the hook portion 16 of the locking plate 15. A hole 18 is provided slightly below the locking plate 15 so as to be concentric with the hole 5' of the cylindrical body 5 when locked.

The dimensions of the attachment relationship between the hitch body 2 and the working device 13 are the distance Y between the center points of the pin 17 of the working device 13 and the hole 18, respectively.
, the distance between the center point of the cylindrical body 5 of the hitch body 2 and the hook part 10 is Y', and the distance between the tip surface of the locking plate 15 of the work implement 13 and the outer peripheral surface of the pin 17 is S, 2 boss part 6
If the distance between and the upper edge of the support piece 8 is S', then Y=Y'
, and s<s'.

Therefore, when attaching the work implement 13 to the hitch main body 2,
The hydraulic cylinder 11 is extended, and the hit body 2 is rotated counterclockwise about the support shaft 3 to take a forward leaning position.

Then, while holding the hitch main body 2 in a forward leaning position, move the tractor forward and first attach the V-shaped uppermost end 7 to the mounting plate 14.
a and 14b, and then the lift arm 1 is slightly raised upward to fit and lock the boss portion 6 into the hook portion 16 of the locking plate 15.

At this time, since the center of gravity of the work implement 13 is located at the front, it rotates counterclockwise about the boss portion 6 as a fulcrum, and its pin 17 abuts against the slope portion 9 of the support piece 8 of the hit body 2.

After the support piece 8 and pin 17 come into contact, when the hydraulic cylinder 11 is retracted, the hit body 2 rotates clockwise around the support shaft 3, and at the same time, the work implement 13 is moved so that the pin 17 is on the slope of the support piece 8. While being pressed against the portion 9, it rotates clockwise around the boss portion 6 as a fulcrum.

Then, when the hydraulic cylinder 11 is further compressed and the slope part 9 becomes almost horizontal, the work implement 13 has its center of gravity in the front as described above, so the pin 17 slides on the slope part 9 due to its own weight and hooks up. It moves to the part 10 side and fits into the hook part 10.

Thereafter, the pin 19 is inserted into the hole 18 and the hole 5' of the cylindrical body 5, and the pin 19 is fixed with a ring pin 20.

When it is desired to remove the working implement 13, the pin 19 is removed, the lift arm 1 is rotated downward, and the tractor is moved backward.

Figure 5 shows the case where the pitch main body 2' is installed on the rear side of the tractor, and the back structure of the hitch main body 2' and the work implement 13, as well as the dimensions related to their installation, are those that are installed on the front loader side. are the same.

Note that the same parts are indicated by the same reference numerals. In this case, the pitch main body 2' is held by a so-called three-point link.

That is, in FIG. 5, 21 and 22 are a lower nonk and a lifting arm, 23 whose base ends are respectively pivotally connected to a part of the tractor.
24 is a connecting link that connects the tip of the lifting arm 22 and the middle part of the lower link 21, and 24 is a machine frame that is pivotally attached to the tip of the lower link 21 with a support shaft 25, which is a side part as shown in FIG. 24′.

A horizontal frame 26 is installed between 24'.

The hitch main body 2' is a side portion 24' of the machine frame 24.
, 24', respectively.

Reference numeral 27 is a connecting rod that is fixed and erected between the machine frame 24 and the horizontal rod 26 as shown in FIG.
The tip of a piston rod 29 of a hydraulic cylinder 28 whose base end is pivotally connected to a part of the tractor is pivotally connected, and the hitch body 2' is rotated about a support shaft 25 by expansion and contraction of the hydraulic cylinder 28.

In this case, move the tractor backwards and move the hitch main body 2.
The working device 13 is attached to the front loader side, but the operation procedure is exactly the same as the case where the working device 13 is attached to the front loader side, so a description thereof will be omitted.

As explained above, the present invention provides a hit body having a boss section at the upper end and a protruding support piece having a slope section and a hook section at the lower end, which can be attached to the front or rear side of a tractor. In addition to being rotatably attached, a mounting plate corresponding to the pitch body is fixed only to the rear of the work implement, and a locking plate into which the boss of the hitch body fits and locks the upper end of the mounting plate. is attached adjacent to the mounting plate, and a pin is provided at the lower end to fit into the hook part of the hitch body, and at the upper end, the locking plate of the work implement and the boss part of the hitch body are connected. At the lower end, after the working implement is locked to the hitch body by engaging the pin of the work implement and the hook part of the hitch body, a removable pin is provided adjacent to the boss part of the hitch body. Since the construction is such that the two are connected to each other through the hole in the mounting plate of the working implement, all that is required to attach the working implement to the tractor is to insert a pin through the pin. Since it engages with the hitch body, not only can it be manufactured with high engagement precision, but this part will not be damaged by objects handled during work, and it is extremely easy to attach the work implement. Replacement work is also extremely simple and easy.

In addition, since the implement can be used for both the front and rear parts of the tractor, the operating rate of the implement is high, and the purchaser does not have to purchase separate implements for the front or rear side. Moreover, if a fork is attached, it can be easily used as a forklift, making it extremely versatile and economical.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the structure of the hitch according to the present invention,
This shows the case where the work equipment is attached to the front side of the tractor. FIG. 2 is a front explanatory view of the hitch main body, FIG. 3 is a plan view of the working implement, and FIG. 4 is an explanatory view showing a state in which the hitch main body and the working implement shown in FIG. 1 are connected. FIG. 5 is an explanatory diagram of the structure of a hitch according to the present invention, similar to FIG. 1, and shows a case where a working implement is attached to the rear side of the tractor. FIG. 6 is an explanatory view showing how the hitch main body is attached to the machine frame, and FIG. 7 is an explanatory view showing how the hitch main body and the work implement shown in FIG. 5 are connected. 2.2'...Hit body, 6...Boss part, 8...Support piece, 9...Slope part, 1
0...Hook part, 13...Bucket),
14a, 14b...Mounting plate, 16...
Locking plate, 17... pin, 19... pin.

Claims (1)

[Scope of utility model registration request] The hitch body, which has a boss part on the upper end and a protruding support piece with a slope part and a hook part connected to the lower end, is rotatably attached to the front or rear side of the tractor, and can be used for work. A mounting plate that corresponds to the hitch body is fixed only to the rear of the device, and a locking plate into which the boss of the hitch body fits and locks is installed adjacent to the mounting plate at the upper end of the mounting plate. A pin that is inserted into the hook part of the hitch body is installed at the lower end, and a pin is installed at the upper end to connect the locking plate of the work implement and the boss part of the hitch main body, and at the lower end, the pin is inserted into the hook part of the hitch main body. After the work implement is locked to the hitch body by the engagement of the pin and the hook part of the hitch body, the removable pin is used to lock the work implement to the boss part of the hitch main body and the hole in the mounting plate of the work implement provided close to the hitch body. The structure of the hitchi is characterized by being structured so as to combine the two.