JP3170683B2 - Shear pin fall prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical device and a shear pin used as protection means for an operator during an operation, and more particularly to a shear pin mounted as a protection means for the mechanical device due to overload. The present invention relates to a device for preventing a separating piece of a shear pin from being detached from a mounting position after shear separation.

[0002]

2. Description of the Related Art Heretofore, this type is as follows. Sharpins used as protective means for various machinery and operators are known. A. As an example, in the side wing device of the snow removing machine, in order to protect the side wing device and the operator from overload due to obstacles, etc., when the shear pin is mounted and the side wing device is overloaded, the shear pin is sheared. The side wing device and the operator are protected. However, when the shear pin is sheared and separated, it drops off from the mounting position and is left on the road surface and the shoulder. B. Further, in Japanese Patent Application Laid-Open No. 10-68109, when the tension bolt is cut, the separating piece is not detached from the mounting hole due to the effect of the nut and the retaining ring. ,
Nut tightening and retaining rings must be fitted.

[0003]

The above-mentioned prior art has the following problems. A. The conventional mechanical device and operator protection means of the shear pin type are those in which the shear pin is sheared by an overload applied to the mechanical device, and the shear separation pieces of the shear pin fall off and are left on the road surface and the road shoulder and mixed with snow. Things. The effect of this is that the blower of the rotary snowplow is damaged. In addition, the snow plows and the like are scattered at the same time as snow removal and enter fields and ranches, and there is a fear of adverse effects such as damage to rotating blades of agricultural machines and accidental swallowing of livestock. Furthermore, there is a concern that scattering by tires of a general passing vehicle may cause obstacles to other passing vehicles. In addition, in snow removal at airports, if the shear separation pieces of the shaping pin scatter, there is a concern that the aircraft may have some adverse effect. B. Further, as disclosed in Japanese Patent Application Laid-Open No. H10-68109, when replacing the tension bolt, the nut and the retaining ring need to be attached each time.

[0004] The present invention has been made in view of such problems of the prior art, and has as its object to provide the following. A. A shear pin bush 2 is press-fitted to each member at the sharp pin mounting position. A C-shaped ring fitting groove 2A is formed inside the shear pin bush 2,
The C-shaped ring 1 is engaged, and the C-shaped ring 1
Is obtained by subjecting a spring steel material to a heat treatment and is an elastic body. Further, the inner diameter of the C-shaped ring 1 is
Are configured to be slightly smaller than the outer diameter of. After the shear pin 3 is inserted into the C-shaped ring 1 fitted in the C-shaped ring fitting groove 2A inside the shear pin bush 2, an appropriate tightening force is generated by the elastic action of the C-shaped ring 1, and the shear pin 3 is tightened and held. However, even if the shear pins 3 are separated by shearing, the separation pieces 3Al of the respective shear pins do not fall off while being held at the mounting position by the tightening force of the C-shaped ring. B. Further, the side wing device of the snow removing machine will be described as an example as follows. In the side wing device provided for the snow removal vehicle A for the purpose of removing snow, the side wing device includes a device for discharging snow accumulated on a road surface (a roadway and a sidewalk) to the outside of the road, a sidewalk and a sidewalk. There are two types of apparatuses for scraping snow to scrape snow to a roadway and throw the snow scraped by a rotary snowplow of a succeeding vehicle to a distant position outside the road.

In the present invention, the former road surface (roadway and sidewalk)
The following description is based on a side wing device of a type that discharges snow accumulated on the outside of a road. In side wing device, a shear pin instrumentation attachment position adjusting tube center portion is bending support mechanism of the working angle of the side wing body 10, the lower arm 7 and upper arm 8 is bending support mechanism of the tilt angle of the side wing body Although it is attached to two places of the joint, the following description will be made based on the tilt angle changing mechanism. A shear pin bush 2 is press-fitted to each member at the shear pin mounting position. A C-shaped ring 1 is inserted into the C-shaped ring fitting groove 2A inside the shear pin bush.
Are fitted, and the C-shaped ring has a tightening force capable of fixing the shear pin 3. Therefore, even if the shear pin 3 is sheared and separated by an overload, the shear pin separation piece 3A1
Is held at the mounting position and does not fall off.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention is as follows. That is,
According to the present invention, the shear pin bush 2 is fitted to each member at the shear pin mounting position, the shear pin 3 is inserted into the inside of the shear pin bush 2, and the proper insertion position of the shear pin 3 is determined by mounting the lock pin 4. When the shear pin 3 is fixed and reaches the shear stress limit, a shear groove 3A to be sheared is machined, and the position of the shear groove 3A and the position of the contact surface of each shear pin bush 2 are configured to match. Is overloaded and shear pin 3
When the shear stress reaches the limit of the shear stress, the shear pin is configured to be sheared from the shear groove 3A, and a C-shaped ring fitting groove 2A is formed inside each of the shear pin bushes 2, and the C-shaped ring fitting groove is formed. Each of the C-shaped rings 1 is fitted into 2A, and the C-shaped ring 1 has a ring shape.
And a part of the outer periphery is cut and separated to form a C-shape and cut.
The dimensions are configured to have an appropriate opening width, and the C-shaped ring 1 is obtained by subjecting a spring steel material to a heat treatment and is an elastic body. Further, the inner diameter of the C-shaped ring 1 is configured to be slightly smaller than the outer diameter of the shear pin 3 , and the shear pin 3 is inserted into the C-shaped ring 1 fitted in the C-shaped ring insertion groove 2 </ b> A inside the shear pin bush 2. After that, C
An appropriate tightening force is generated by the elastic action of the shaped ring 1 to tighten and hold the shear pin 3, and even when the shear pin 3 is separated by shearing, the separation pieces 3 Al of each shear pin are attached to the mounting position by the tightening force of the C-shaped ring. This is a device for preventing a sheer pin from dropping off while being held.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings. The following is an example of a side wing device of a snow removing machine. In the side wing device provided for the snow removing vehicle A for the purpose of removing snow, the side wing device includes a road surface (a roadway and a sidewalk).
To remove snow accumulated on the road to the outside of the road, and to scrape the snow on the sidewalk and shoulders to the roadway and throw the snow scraped by the rotary snow plow of the succeeding vehicle to a distant position outside the road, There are two types of devices for scraping. The present invention will be described below with reference to the drawings of a side wing device of the former type in which snow accumulated on a road surface (a roadway and a sidewalk) is discharged to the outside of the road. The arrow indicates the traveling direction of the snowplow.

Referring to FIG. 1, in the side wing device, the mounting position of the shear pin 3 is determined by adjusting the center portion of the adjusting pipe outer cylinder 12 which is a support mechanism for changing the working angle of the side wing body 10 and the side wing body 10. There are two places where a lower arm 7 and an upper arm 8, which are support mechanisms for tilt angle change, are joined. FIG. 1 shows a state in which the tilt mechanism supporting device is mounted with a shear pin, in order to explain an example of a tilt angle changing mechanism in the present invention.

FIG. 2 shows a shear pin bush 2 and FIGS.
Shows a C-shaped ring 1 and FIG. 5 shows a shear pin 3. FIG.
With reference to the figure, while the snow-removing vehicle A is moving forward, the side wing body is overloaded by an obstacle during the snow-removing operation by the side wing device, and the shear pin 3 attached to the central portion of the adjusting pipe outer tube 12 is sheared to be vertical. The shaft 13 is pivoted and retracted rearward about the axis. Note that the work angle of the side wing body 10 in the snow removing operation is changed by the expansion and contraction operation of the hydraulic cylinder 15. Further, in the snow removing operation by the forward movement of the snow removing vehicle A, if an obstacle is brought into contact with the vehicle front outside portion of the side wing body 10 and an overload is applied, the connecting portion between the support shaft 11 at the center of the adjusting tube and the adjusting tube outer tube 12. The shear pin 3 attached to is separated by shearing,
While the side wing body 10 is in contact with an obstacle as the vehicle advances, the adjusting tube outer cylinder 12 slides, and the entire adjusting tube is in an extended state. Therefore, the side wing body 10 turns and retracts rearward with the vertical axis 13 as an axis only while being pushed by an obstacle as the snow removal vehicle A advances.

FIG. 7 shows that during the snow removal operation by the side wing device, an obstacle causes an overload to be applied to the lower portion of the side wing body due to an obstacle, and the shear pin 3 attached to the joint between the lower arm 7 and the upper arm 8 is sheared. FIG. 4 is a rear view of a state in which a shear pin attachment joint of an upper arm 8 is separated, and a side wing body 10 is pushed up, turned, and retracted by an obstacle around a horizontal axis 9 as an axis.
The tilt angle of the side wing body 10 in the snow removing operation is changed to an angle corresponding to the state of the road surface. That is, the side wing body 1 is placed on a flat road surface such as a road or a sidewalk, or on a slope such as a slope.
In order to align the lower surface of the lower arm 7 with the pin 18 as a pivot,
And the upper arm 8 is turned up and down.
During the snow removal operation while the snow removal vehicle A is moving forward, following the rolling of the vehicle, the irregularity of the road surface, and the following of unevenness, the pin 17 at the tip of the upper arm 8 rotates inside the elongated hole 16A of the turnbuckle 16. This can be handled by:

When the amount of pushing up of the tip of the side wing body 10 is too large due to obstacles or the like and cannot be handled by the long hole 16A of the turnbuckle, the relief valve incorporated in the hydraulic circuit of the hydraulic cylinder 14 is used. To release the pressure in the hydraulic cylinder 14 by operation (not shown),
Even if the amount of pushing up of the lower end of the side wing main body 10 is increased, it can be handled. Furthermore, a large load is instantaneously generated due to an obstacle in an abnormal state, and the long hole 1
In the case where the free operation of the pin 17 inside the 6A or the operation of releasing the pressure in the hydraulic cylinder 14 by the relief valve incorporated in the hydraulic circuit of the hydraulic cylinder 14 cannot be handled, the lower arm 7 To the shear pin 3 attached to the joint of the upper arm 8 and
Since a load which reaches the limit of the shear stress is applied, the lower arm 7
And the joint between the upper arm 8 and the upper arm 8 are separated. That is, since only the upper arm 8 is rotatable about the pin 18 as a pivot, the side wing body is not affected by the expansion and contraction operation of the hydraulic cylinder 14 even if the amount of pushing up by the obstacle against the side wing body 10 increases. In addition, it is possible to push up and retreat.

FIG. 1 also shows a state in which the shear pin 3 is mounted on the joint between the lower arm 7 and the upper arm 8 corresponding to each member at the shear pin mounting position in the tilt angle changing mechanism support device. This will be described in detail below. The shear pin bush 2 is fitted to each of the lower arm 7 and the upper arm 8, and the shear pin bosses 5 and 6 are fixed to the outside of the upper arm 8, respectively. Furthermore, the C-shaped ring fitting groove 2 inside the shear pin bush 2
A is fitted with a C-shaped ring 1. C-shaped ring 1
Has a ring shape, and cuts and separates a part of the outer circumference to form a C
Shape and the cutting dimensions are configured to have the appropriate opening width.
Further, the C-shaped ring 1 is obtained by subjecting a spring steel material to heat treatment, and is an elastic body. Further, the inner diameter of the C-shaped ring 1 is configured to be slightly smaller than the outer diameter of the shear pin 3. After the shear pin 3 is inserted into the C-shaped ring fitted into the C-shaped ring fitting groove 2A inside the shear pin bush 2, an appropriate tightening force is generated by the elastic action of the C-shaped ring 1, and the shear pin 3 is tightened and held. Even when the shear pin 3 is separated by shearing, the separation piece 3A1 of each shear pin is configured not to fall off while being held at the mounting position by the tightening force of the C-shaped ring. Further, the C-shaped ring itself is fitted in the C-shaped ring fitting groove inside the shear pin bush, so that it is not damaged by external influences and does not come off, so that it can be used semipermanently.

When the shear pin 3 is mounted, it is fixed at a fixed position by the lock pin 4 after insertion. The shear pin bush 2 is configured so that each side surface which has been hardened by the heat treatment and the shear groove 3A of the shear pin 3 coincide with each other, and an overload is applied to a lower portion of the side wing body 10,
When the limit of the shear stress of the shear pin 3 is reached, shearing can be easily performed. In the snow removing operation, the shear pin 3 is sheared and separated due to the overload applied to the side wing body 10, but the fastening effect of the C-shaped ring 1 can be obtained even if the shear pin mounting joint between the lower arm 7 and the upper arm 8 separates as shown in the figure. Thus, the separation piece 3A1 of the cut and separated shear pin is held to prevent falling off.

[0014]

Since the present invention is configured as described above, the following effects can be obtained. 1. Even when the shear pins are separated by shearing, the separated pieces of the shear pins are retained and do not fall off due to the tightening effect of the C-shaped ring. Therefore, there is no concern that the vehicle may be left on the road and hinder the snow removal vehicle, the agricultural machine, or the general traffic vehicle. In addition, it does not adversely affect livestock. Also,
In snow removal at airports, there is no adverse effect on the aircraft due to the falling and scattering of the cut and separated pieces of the sharpin. 2. In the replacement of the shear pin, accessories such as a nut and a retaining ring are unnecessary, and the replacement can be easily performed by a normal pushing and pushing operation of the single shear pin. 3. In addition, since the number of parts is small, the shear pin can be manufactured at low cost and can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing a mounting state of a shear pin in a device for supporting a mechanism for changing a tilt angle of a side wing body.

FIG. 2 is a sectional view of a shear pin bush.

FIG. 3 is a side view of a C-shaped ring.

FIG. 4 is a sectional view taken along line AA of the C-shaped ring .

FIG. 5 is a plan view of a shear pin.

FIG. 6 illustrates a state in which a shear pin attached to the center of the adjustment pipe outer tube is sheared due to an overload in the snow removal work of the side wing device, and the side wing body is turned and retracted rearward with the vertical axis as an axis. It is a top view.

FIG. 7: In the snow removing work of the side wing device, the shear pin mounted on the joint between the lower arm and the upper arm of the tilt angle changing mechanism support device is sheared due to overload, and the side wing body is pivoted about the horizontal axis. It is a rear view explaining the state where it pushed up and turned away.

[Explanation of symbols]

 Reference Signs List A snow removal vehicle 1 C-shaped ring 2 Sherpin bush 2A C-shaped ring fitting groove 3 Sharpin 3A shear groove 3A1 Separation piece 4 Lock pin 5, 6 Sherpin boss 7 Lower arm 8 Upper arm 9 Horizontal axis 10 Side wing body 11 Adjusting pipe support axis 12 Adjusting tube outer cylinder 13 Vertical axis 14, 15 Hydraulic cylinder 16 Turnbuckle 16A Turnbuckle long hole 17, 18 pin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 56-66533 (JP, U) Japanese Utility Model Sho 57-122851 (JP, U) Japanese Utility Model Sho 63-33709 (JP, U) Japanese Utility Model Sho 51- 110149 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 9/08

Claims (1)

(57) [Claims] A processing hole is provided in each member at a mounting position of a shear pin for press-fitting the shear pin bush (2), and the shear pin bush (2) is pressed into the processing hole by a press or the like. In a shear pin bush fitted by a normal interference fit method, a C-shaped ring fitting groove (2) is provided inside each of the shear pin bushes (2).
A) is formed, each C-shaped ring in the C-ring fitting groove (2A) (1) are Hama遊, C-shaped ring
(1) is a ring shape, which cuts and separates a part of the outer circumference.
C-shape and cut dimensions should have appropriate opening width
The C-shaped ring (1) is obtained by subjecting a spring steel material to heat treatment and is made of an elastic body. Further, the inner diameter of the C-shaped ring (1) is slightly smaller than the outer diameter of the shear pin (3). After inserting the shear pin (3) into the C-shaped ring (1) configured and fitted in the C-shaped ring insertion groove (2A) inside the shear pin bush (2), the C-shaped ring (1)
An appropriate tightening force is generated by the elastic action of, and the shear pin (3) is tightened and held, and even if the shear pin (3) is separated by shearing, the separation pieces (3A1) of each shear pin are tightened by the tightening force of the C-shaped ring. The sherpin is prevented from falling off while being held at the mounting position.