JPS647163B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic shear pin replacement technology for a snow plow with shear pin support, and more specifically, to a technology that skillfully utilizes the movement of a hydraulic cylinder that lifts and lowers a snow plow. The present invention relates to an automatic shear pin replacement system that can automatically and easily replace shear pins without requiring any manual work, and can be greatly utilized to save labor in shear pin replacement work in severe cold weather.

[Conventional technology and problems to be solved]

As is well known, to ensure traffic in snowy countries, snow plows equipped with snow plows are used to remove snow from main roads. And the plow of such a snowplow,
In order to ensure safety when colliding with an obstacle, it is normal to have a mechanism for reversing the cutting edge at the lower edge, but in the case of such a system, the cutting edge does not reverse under normal conditions. As a means to prevent this, a structure in which a shear pin is used to hold the vehicle is increasingly being adopted.

By the way, in such a shear pin supported snow plow, if the cutting edge collides with an obstacle and the shear pin breaks, it is necessary to replace the shear pin, and this replacement work must be done at night when it is extremely cold. It was said to be a very difficult and difficult task.

Therefore, the inventor of the present invention made various efforts to find a way to simplify the shear pin replacement work, and as a result, he succeeded in putting into practical use a snow plow having a structure as shown in Japanese Utility Model Publication No. 55-32898.

However, in this case, since the shear pin support member protrudes from the front of the plow, this part tends to increase the resistance of the snow flow path during snow removal and impede the smooth flow of snow. Since replacement still had to be done manually, requests for further improvements were heard from those actually engaged in snow removal work.

The present invention has been made with the aim of overcoming the difficulties in the shear pin supported snow plow, and going one step further to provide a snow plow that is excellent in snow flow.The technical problem to be solved is the present invention. Unexamined Japanese Patent Application Publication No. 1983-1983, which was first proposed by the inventor.
This invention is the same as the invention described in Publication No. 217815, ``Snow plow automatic shear pin loading device''.

[Means for solving problems]

The means adopted by the present inventor to solve the above technical problem will be explained with reference to the attached drawings.
It is as follows.

That is, in the present invention, cutting edges 1a, 1a, . . . of a required width are provided at the lower edge of the plow body 1, which is installed in the front part of the snowplow S so that it can be raised and lowered according to the expansion and contraction movement of the hydraulic cylinder C, respectively. The above-mentioned cutting of such a snow plow is based on the technical premise of a conventionally well-known snow plow which is pivotably supported in a reversible manner and whose reversal is prevented by a shear pin 13 until a load above a predetermined level is applied to each edge portion 1a. The edges 1a, 1a... are the beams 14 on the back of the plow body 1.
The rear surface is supported by the stay link 3 connected to the force end 21 of the hammer link 2, which is pivotally supported by the hammer link 2, while the working end 22 of the hammer link 2 has the foremost shear pin of the shear pin cassette 4. A hammer head 22 that engages with the shear pin 13 and generates a destructive impact by the upward movement of the stay link 3 connected to the hammer link 2, thereby shearing the shear pin 13.
a and an arcuate guide portion 22b connected thereto, and the shear pin cassette 4 has built-in biasing members 41, 41 for sequentially feeding the shear pin 13 to the set position. The first shear pin 13 is the hammer head 22
When it is sheared and discharged by the destructive impact of a,
By extending the hydraulic cylinder C, the plow body 1 is lifted up, and by shortening the cylinder C, the cutting edge 1a is brought into contact with the ground, and then the cutting edge 1a is brought into contact with the ground. By employing a linkage mechanism means in which the next shear pin 13 is forced to the set position where it engages with the hammer head 22a by the urging force of the urging members 41, 41 by relatively retracting, the above-mentioned This has realized an automatic shear pin exchange system that satisfies the technical challenges.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the accompanying drawings. In addition, Fig. 1 a and b are explanatory diagrams of the mechanism showing the state immediately after the cutting edge is reversed, and Fig. 2 a and b show the state when the entire plow body is lifted by extending the hydraulic cylinder. 3a and 3b are explanatory views of the mechanism, showing a state when the entire plow body is lowered by shortening the hydraulic cylinder after the operation shown in FIG. 2.

Figures 1a and 1b show that during snow removal work, one of the cutting edges 1a of the plow body 1 collides with an obstacle on the road and rebounds while centering on the hinge shaft 1b. This shows a state in which the shear pin 13 is sheared by the hammer head 22a by rotating clockwise (in the direction of the arrow) and rotating the hammer link 2 counterclockwise via the stay link 3.

In such a state, when the hydraulic cylinder C is extended as shown in FIG. 2a, the plow body 1 is lifted as shown in FIG. 2b, and
The cutting edge 1a hangs down in a free state due to its own weight. At this time, the next new shear pin 13 is pressed against the arc-shaped guide portion 22b on the upper surface of the hammer link 2 by the action of the biasing members 41, 41 built into the cassette.

Therefore, next, as shown in Fig. 3, the fluid pressure cylinder C
When the plow body 1 is shortened, the plow body 1 is lowered and the cutting edge 1a touches the ground. At this time, by slightly retracting the lower end of the cutting edge 1a from the ground surface, the edge 1a can move the hinge shaft 1b. It rotates clockwise around the center, and at the same time, the hammer link 2 also rotates clockwise. Then, the shear pin 13, which was pressed against the guide portion 22b of the hammer link 2, slides on the guide portion 22b and engages with the hammer head 22a, locking the cutting edge 1a in its original state. It is.

Thus, such automatic shear pin exchange operation is
This can be repeated as long as the shear pin 13 is present in the cassette 4.

In this embodiment, the shear pins 13 are replenished by rotating the lock handle 5 to attach the shear pin cassette 4 attached to the vertical cylindrical cassette case K disposed on the beam 14 on the back of the plow main body 1. This is done by releasing the action of the force means 41 and removing the cassette 4 from the case K.

Although the system of this embodiment has the configuration generally as described above, the present invention is by no means limited to the above-described embodiment, and various modifications can be made within the scope of the claims. Needless to say, for example, with respect to the mechanism for supplying the shear pin 13 from the cassette 4, it is possible to change the design of the mechanism for supplying the shear pin 13 from the cassette 4, for example, in addition to spring biasing, biasing means using fluid pressure, biasing means using self-gravity, etc. It goes without saying that there is.

[Effects of the present invention]

As explained above, according to the present invention, even if the shear pin is sheared due to the cutting edge of the snow plow colliding with an obstacle on the road,
By operating the hydraulic cylinder, the shear pin can be easily replaced without any manual effort, and the labor of snow removal work in the harsh, freezing winter is greatly reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of a snow plow constructed by applying the present invention. Fig. 1 a and b are explanatory diagrams of the mechanism showing the state immediately after the cutting edge is reversed, and Fig. 2 a and b are explanatory diagrams of the mechanism showing the state immediately after the cutting edge is reversed. An explanatory diagram of the mechanism showing the state when the entire plow body is lifted by extending the hydraulic cylinder. Figures 3a and b are after the operation shown in Figure 2, the hydraulic cylinder is shortened and the entire plow body is lowered. FIG. 3 is an explanatory diagram of the mechanism showing a state when DESCRIPTION OF SYMBOLS 1... Plow body, 1a... Cutting edge, 13... Shear pin, 2... Hammer link, 21... Power end, 22... Working end, 22a
...Hammer head, 22b...Guide part, 3...
...Stay link, 4...Shear pin cassette, 4
1...Biasing member. C...Fluid pressure cylinder, K...
...cassette case, S...snowplow.

Claims (1)

[Claims] 1. A plow body 1 installed at the front of a snowplow S so that it can be raised and lowered in accordance with the expansion and contraction movement of a hydraulic cylinder C.
A cutting edge 1a of the required width is attached to the lower edge of the
In a snow plow, the cutting edges 1a, 1a are each pivotally supported so as to be reversible to the rear, and the reversal is prevented by a shear pin 13 until a predetermined load or more is applied to each edge portion 1a;
The rear surface of a is supported by the stay link 3 connected to the force end 21 of the hammer link 2 which is pivotally supported on the beam 14 on the back of the plow main body 1, and the working end 22 of the hammer link 2. The hammer head 22 engages with the foremost shear pin 13 of the shear pin cassette 4 and generates a destructive impact by the upward movement of the stay link 3 connected to the hammer link 2 to shear the shear pin 13.
a and an arcuate guide portion 22b connected thereto, and the shear pin cassette 4 is provided with a shear pin 1
3 to the set position in sequence.
1 and 41 are built in, and the foremost shear pin 13 is the hammer head 22.
When it is sheared and discharged by the destructive impact of a,
By extending the hydraulic cylinder C, the plow body 1 is lifted up, and by shortening the cylinder C, the cutting edge 1a is brought into contact with the ground, and then the cutting edge 1a is brought into contact with the ground. An automatic shear pin exchange system characterized in that by relatively retracting the shear pin 13, the next shear pin 13 is forced to the set position where it engages with the hammer head 22a by the urging force of the urging members 41, 41.