JPH0447083B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a plow that is attached to a snowplow, and in particular, the present invention relates to a plow that is attached to a snowplow, and in particular, when the cutting edge at the lower end of the plow receives an abnormal impact during work. This is used in the field of safety devices that rotate edges in reverse.

(b) Prior art A conventional plow safety device is disclosed in Utility Model Publication No. 55-32898, in which a pair of left and right male joints protrudes from the front of the plow, and a cutting edge body integrated with the cod. A female joint is protruded from the front of the plow between the male joints, and a shear pin is provided between the two joints, and if the blade body receives an abnormal impact, the shear pin is cut and the blade body rotates backward. It is designed to prevent damage to the cutting edge body.

(c) Problems to be Solved by the Invention However, in the above structure, since both joints protrude to the front of the plow, snow on the front of the plow hits both joints and adheres to both joints without being removed, impeding snow removal work.

Furthermore, when replacing the shear pin, the snow attached to both joints must be removed before the shear pin can be replaced, forcing workers to perform harsh work in cold regions.

(d) Means for solving the problems The present invention solves the problems as described above.
In a plow consisting of a plow body and a cutting edge, the cutting edge is rotatably supported on the rear surface of the plow body via a bracket,
On the other hand, a reinforcing member is provided on the rear surface of the plow body, a rotating body is provided on the cutting edge via a mounting member at a position apart from the bracket, and the rotating body is located behind the reinforcing member and the cutting edge is The reinforcing member is located approximately on the same line as the shaft fulcrum, and the reinforcing member is provided with a through hole passing through it in the front and back, the rotating body is provided with a hole that is located on the same line as the through hole, and shear pins are inserted into both of the holes. The present invention relates to a plow safety device in which the annular groove of the shear pin is located between a reinforcing member and a rotating body.

(e) Action During snow removal work, if the cutting edge hits an obstacle such as a manhole cover and receives an abnormal impact, shearing occurs between the reinforcing member and the rotating body in the annular groove of the shear pin. The force acts and the shear pin is cut.

When the shear pin is cut, the cutting edge together with the rotating body rotates rearward about the pivot point to avoid obstacles.

(f) Embodiment An embodiment will be described below with reference to the drawings. Reference numeral 1 denotes a plow, and the plow 1 consists of a plow body 2 and a cutting edge 3 divided into a plurality of parts.

A reinforcing beam 4 extending in the left-right direction is fixed to the rear surface of the plow body 2 in a box shape, and a thick reinforcing member 5 is attached to the rear surface of the plow body 2 below the reinforcing beam 4.
is fixed.

An upper bracket 6 is fixed to the reinforcing girder 4 and the reinforcing member 5, a lower bracket 7 is fixed to the cutting edge 3, both brackets 6 and 7 are pivotally supported, and cutting is performed around the pivot point 8. Edge 3 is designed to be able to rotate backwards.

On the other hand, on the rear surface of the cutting edge 3, a mounting member 9 is attached with a countersunk bolt 1 close to the lower bracket 7.
0 and a nut 11.

The mounting member 9 extends to the rear of the reinforcing member 5,
A cylindrical rotating body 12 is fixed to the free end of this mounting member 9, and the rotating body 12 is arranged so that its axis coincides with the pivot point 8 of the upper and lower brackets 6 and 7.

Reference numeral 13 denotes a through hole passing through the reinforcing member 5 and the plow body 2 in the front-rear direction, and the through hole 13 has a large diameter portion 14 formed with a female thread at the front and a small diameter portion 15 at the rear.

16 is a hole perpendicularly penetrated through the rotating body 12;
The hole 16 passes through the center of rotation of the rotating body 12 and is aligned with the through hole 13 when the cutting edge 3 is positioned on the same plane as the plow body 2.

A shear pin 17 is inserted through the through hole 13 and the hole 12, and the annular groove 18 formed in the center of the shear pin 17 is connected to the reinforcing member 5.
and the rotating body 12.

Reference numeral 19 denotes a stop member for preventing the set position of the annular groove 18 of the shear pin 17 from shifting. The set position of the annular groove 18 is fixed.

20 is a hexagonal hole provided in the stopper member 19.

FIG. 4 shows the shear pin 17 and stop member 19 separated, and by screwing the stop member 19 into the through hole 13, the annular groove 18 can be fixed at the set position.

At this time, the shear pin 17 is prevented from coming off backward by making the hole in the rotating body have an inner diameter that approximates the outer shape of the shear pin 17.

FIG. 5 shows a spring ring 22 fitted into a part of the shear pin 21.
2 and insert it into the through hole 24 of the reinforcing member 23 together with the shear pin 21. When the annular groove 25 comes to the set position, the spring ring 22 expands and fits into the notched groove 26 of the reinforcing member 23, and the shear pin 21 is fixed. It's becoming more and more popular.

In FIG. 6, a snap ring 27 is fitted into a reinforcing member 28 at a position in front of the shear pin 17 to prevent the shear pin 17 from moving forward.

At this time, rearward slippage is prevented by making the hole in the rotating body smaller, as in the case of FIG.

In addition, in the examples, various structures have been described in order to prevent the shear pin from shifting from the set position, but if the through hole of the reinforcing member and the hole of the rotating body are made to have an inner diameter close to the outer diameter of the shear pin, the stopper member can be It can be fixed in the set position by the frictional force between the shear pin and each hole without providing any.

The present invention has the above-mentioned structure. Next, the operation will be explained. First, snow removal work is performed in the state shown by the solid line in FIG.
It is scraped off by the plow body 2 and laterally removed by the plow body 2.

Next, if the cutting edge hits an obstacle and an abnormal impact occurs, the reinforcing member 5 and the rotating body 1
2, the shear pin 17 is cut at the annular groove 18, and the cutting edge 3 rotates rearward about the pivot point 8 from the solid line position in FIG. To avoid damage to the cutting edge 3.

To return to the working state after avoiding an obstacle, remove a portion of the stop member 19 and shear pin 17, and then rotate the cutting edge 3 that has been rotated backwards forward to open the through holes 13 and 16. match,
In this state, a new shear pin 17 is inserted into both holes 13 and 16 from the front of the plow 1, and screwed in with the stopper member 19.

At that time, the shear pin 1 is inserted into the hole 16 of the rotating body 12.
Part of 7 remains, but new shear pin 17
can be removed from the hole 16 by inserting it.

(g) Effects of the Invention As described above, the present invention pivots the cutting edge to the plow body via a bracket so that it can rotate backwards, while the rotating body provided integrally with the cutting edge is reinforced integrally with the plow body. The reinforcing member is located at the rear of the member and approximately on the same line as the pivot point, the reinforcing member is provided with a through hole passing through the front and rear, the gas rotor is provided with a hole that is on the same line as the through hole, and both of the holes A shear pin is inserted from the front of the cutting edge, and if an abnormal impact is applied to the cutting edge, the shear pin is cut and the cutting edge rotates backwards around the pivot point to avoid obstacles.
Damage to the cutting edge can be reliably prevented.

In addition, since the shear pin is installed between the reinforcing member and the rotating body, there is no protruding part from the plow body, making it possible to perform snow removal work smoothly and reliably, and also to easily replace the shear pin. can.

Furthermore, since the shaft support part of the cutting edge and the mounting part of the rotating body are made separate, the stabilizing device can be easily attached to an existing plow.

[Brief explanation of the drawing]

Figure 1 is the rear view of the whole, Figure 2 is A- of Figure 1.
A sectional view, Fig. 3 is a BB sectional view of Fig. 1, Fig. 4
Figures 6 through 6 show other embodiments of shear pin attachment. 1 is a plow, 2 is a plow body, 3 is a cutting edge, 5 is a reinforcing member, 6 is an upper bracket,
7 is a lower bracket, 12 is a rotating body, 13 is a through hole, 16 is a hole, 17 is a shear pin, and 18 is an annular groove.

Claims (1)

[Claims] 1. In a plow consisting of a plow body and a cutting edge, the cutting edge is rotatably supported on the rear surface of the plow body via a bracket, and a reinforcing member is provided on the rear surface of the plow body, and the cutting edge is provided with a reinforcement member on the rear surface of the plow body. A rotating body is provided at a position apart from the bracket via a mounting member, and the rotating body is positioned behind the reinforcing member and approximately on the same line as the pivot point of the cutting edge. A through hole is provided in the rotating body, a hole located on the same line as the through hole is provided in the rotating body, a shear pin is inserted into both of the holes, and an annular groove of the shear pin is inserted between the reinforcing member and the rotating body. A plow safety device located between.