JPH1068109A - Blade device of earth-moving vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the broken piece of a bolt from dropping out, by providing a retaining means preventing the broken piece of a tension bolt broken and separated due to shocks, from getting out of the bolt hole. SOLUTION: When a cutting edge 8 collides with an obstacle 71 on the ground face E during a work by means of a blade device 2, an impulse generates to rotate the cutting support 6 to the arrow mark 72 and acts on the tension bolt 10. When the impulsive force is larger than the strength of the bolt 10, the bolt is broken. The stopring provided in the bolt 10 contacts the fixed face of the bolt hole 12 to prevent the separated piece from the bolt from dropping out of the hole, in the bolt hole 12 of the fitting block 6a of the support 6. And further, the broken piece is prevented from dropping out of the bolt hole 12 of the fitting block 4a of the blade body 4. In this way, the broken piece of the bolt 10 can be prevented from dropping out of the bolt hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade device for an earth-moving vehicle, and more particularly, to a cutting edge support (cutting edge support) fixed to a blade main body by a tension bolt (pull bolt), and by an impact applied to the cutting edge support. The present invention relates to a blade device having a structure in which a tension bolt is cut and separated.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 63-31604 discloses a blade device for an earth-moving vehicle. The blade device includes a blade body, a cutting edge support rotatably mounted on a lower end portion of the blade body, and a turning of the cutting edge support. A tension bolt for stopping and fixing the cutting edge support to the blade body, and when an impact greater than the strength of the tension bolt acts on the cutting edge support, the tension bolt is cut off and the cutting edge support is pivotable with respect to the blade body. A blade device is disclosed. This blade device is attached to the cutting edge support of the blade device on obstacles such as curbs, electric poles, large stones on the ground, manhole covers, etc. when performing snow removal work by an earthmoving vehicle equipped with the blade device. When the cutting edge collides, the impact causes the tension bolt to be cut and separated by receiving the force in the tensile direction, absorbing the energy of the impact and turning the cutting edge support against the blade body to avoid obstacles. The impact on the earthmoving vehicle and the blade device is cushioned.

The structure and operation of a portion of the blade device relating to the present invention will be described with reference to FIGS. 4 and 5 of the gazette. The blade body (the gazette of the gazette 4; A cutting edge support (6) is attached to a lower end of the publication (see the publication with a reference numeral) so as to be pivotable about a connecting pin (24) and a connecting rod (28) via a connecting member (26). The upper end of the cutting edge support (6) has a through hole (52)
It is fixed to the blade body (4) by a tension bolt (44) passed through. Here, when an impact (in the direction of arrow 80) of the strength of the tension bolt (44) acts on the cutting edge (8) attached to the cutting edge support (6), the tension bolt (44) is pulled by the pulling force. V provided on the shaft
The cutting edge support (6) is pivoted with respect to the blade body (4) to avoid obstacles while being cut off and separated from the groove, thereby damping the impact applied to the earthmoving vehicle and the blade device.

[0004]

The conventional through hole for mounting a tension bolt is provided so that the mounting hole can be easily accessed from the outside in order to facilitate the work of remounting the tension bolt when the tension bolt is cut. The blade device penetrates from the front side to the rear side. Therefore, the separation pieces of the tension bolts that are pulled and cut by the impact and separated into two pieces escape from the mounting holes and are discharged to the outside, so that there is the following problem. (1) In a snow removal operation, which is a typical application of the blade device, the separated pieces are mixed into the snow and damage rotating parts such as a blower and an auger of the snow removal machine. (2) If the separation piece is left on the road surface after snow removal, it will hinder running of a high-speed running vehicle or the like. (3) In the collection operation of the present blade device in a stockyard, for example, in which a mixture of foreign matter is not allowed, for example, uniform sand, gravel, salt, and cereal, the separated pieces are mixed as foreign matter into a homogeneous processed material, Special work steps are required to extract the separation pieces.

The present invention has been made in view of the above-mentioned circumstances, and a technical problem thereof is to provide a blade device in which when a tension bolt is cut and separated, the separated piece is held so as not to be detached from the mounting hole. It is to be.

[0006]

According to the present invention, in order to solve the above technical problem, a tension bolt holding means is provided in a tension bolt and a mounting hole of a blade device, and a separation piece of the tension bolt is provided in the mounting hole. So that it can be held without detaching.

[0007] That is, according to the present invention, as a blade device for an earthmoving vehicle that solves the above technical problem, the blade device is configured to hold the cut and separated tension bolt from being detached from the mounting hole of the tension bolt. A blade device is provided, comprising:

In a preferred embodiment, the holding means includes a locked means provided on the tension bolt and a locking means provided on the mounting hole, and the holding means includes the locking means and the locked means. The axial movement of the tension bolt in the mounting hole is prevented.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a blade device for an earthmoving vehicle constructed in accordance with the present invention.

Referring to FIG. 1 showing a partial cross section of a lower end portion of a blade device of an earthmoving vehicle, a blade device indicated by reference numeral 2 as a whole includes a blade body 4 and a cutting edge support 6 having a cutting edge 8. , Tension bolt 10 and mounting hole 1 for tension bolt 10
2, the tension bolt 10 and the mounting hole 12 are provided with a holding means 20 for holding the separated piece so as not to be detached from the mounting hole 12 when the tension bolt 10 is cut and separated. The blade device 2 has an appropriate width, for example, a vehicle width of an earth-moving vehicle, and a blade body 4 and a cutting edge 8 and a cutting edge support 6 extend in a direction perpendicular to the paper surface in FIG. A plurality of the tension bolts 10 are disposed substantially at appropriate intervals in the width direction of the blade device.

The blade device 2 is mounted on a front end of an earth-moving vehicle (not shown) via support means (not shown), and is moved by the expansion and contraction movement of an actuator such as a hydraulic cylinder provided on the pointing means. And the position is determined. The movement of the actuator is controlled and controlled in the driver's seat of the earthmoving vehicle.

The blade body 4 is formed by welding steel members and has a concave curved surface on the front surface (left side in FIG. 1). The blade body 4 has a cutting edge support 6 to which a cutting edge 8 is attached. Are mounted as follows. The cutting edge 8 is attached to the cutting edge support 6 by a countersunk bolt 54, a washer 58, and a nut 56. A plurality of brackets 6c each having a connecting rod hole 6b are fixed to the lower portion of the back surface of the cutting edge support 6 in a width direction of the cutting edge support 6 by means such as welding. On the other hand, a plurality of brackets 4c having connecting pin holes 4b are fixed to the rear end of the bottom surface of the blade body 4 in the width direction of the blade body 4 by means such as welding.
The connecting rod holes 6b of the plurality of brackets 6c are provided with connecting rods 18 in the width direction of the cutting edge support 6.
Connecting member 1 having a plurality of pin holes at both ends.
One end of 4 is rotatably connected. Connecting member 14
Can be formed by a thick steel plate. The other end of the connecting member 14 is connected to the bracket 4 c via a connecting pin 16.
Is rotatably connected to the The cutting edge support 6 is pivotally attached to the blade body 4 by the connecting member 14.

A mounting block 6 a having a through hole 12 for a tension bolt 10 is fixed to the upper end of the back surface of the cutting edge support 6 by welding. At the front end of the bottom surface of the blade body 4, a through-hole 12 abuts on the mounting block 6 a and is provided in the mounting block 6 a.
Tension bolt 10 having substantially the same central axis as
The mounting block 4a provided with the through mounting hole 12 is fixed by welding. A counterbore 12 a for accommodating the head of the tension bolt 10 is provided at an end of the through-hole 12 on the cutting edge support 6 side. The tension bolt 10 is inserted into the mounting hole 12 from the front (left side in FIG. 1) of the blade device 2 through the counterbore 12 a, and a washer 52 and a nut 50 are attached to a thread portion at the tip protruding from the mounting hole 12. by this,
Mounting block 6 on the back of cutting edge support 6
“a” is fixed to a mounting block 4 a on the bottom surface of the blade body 4, and the cutting edge support 6 is fixed to the blade body 4 so as not to turn. At a portion of the mounting hole 12 provided in the mounting blocks 6a and 4a, a holding means 20 for the tension bolt 10 described in detail later is provided.

Here, the holding means in the present invention means that even after the tension bolt is cut and separated by the pulling force,
Means for preventing the separation piece from moving in the axial direction of the mounting hole, and preventing and holding the separation piece from detaching from the mounting hole.Specifically, as described in detail later, a means provided on the tension bolt Provided on both sides of the cut separation portion is a projection-shaped locking means having an outer diameter larger than the axis diameter of the tension bolt, and the mounting hole is provided with a mounting hole axis for preventing the locked means from moving in the mounting hole axial direction. This can be achieved by providing a vertical wall-shaped locking means, and preventing the movement of the separation piece in the axial direction of the mounting hole by contact between the locking means and the locked means.

The tension bolt 10 will be described with reference to FIG. 2. The tension bolt 10 has a well-known bolt shape, that is, has a head at one end and a thread at the other end, and is made of steel. An annular V-shaped notch 10a, which is perpendicular to the axial direction, is provided on the intermediate outer peripheral surface, and a portion that is weakest against tensile force, that is, a cut portion is formed. When the mounting block 6a and the mounting block 4a move in the directions away from each other, an axial tensile force is applied to the tension bolt 10, and when the force reaches a set value, the tension bolt 10 is moved from the V-shaped notch 10a. Be cut off. The magnitude of the cutting force is V-shaped notch 10
It is set according to the bolt shaft cross-sectional area of part a and the strength of the material used.

Referring to FIG. 2 and FIG.
To explain the outline of the embodiment of the present invention, the tension bolt 10 has a retaining ring 22 constituting a locked means and a retaining ring 2.
2 is provided with an annular groove 10b. The mounting holes 12 are provided with locking surfaces 12b and 12c as locking means, respectively.

Retaining ring 22 and groove 10b, which are locking means
Are provided on the tension bolt 10 as follows. In the longitudinal direction of the tension bolt 10, two annular grooves 10b are formed on both sides of the V-shaped notch 10a at right angles to the axis. The retaining ring 22 is made of elastic spring steel, the outer diameter of which is larger than the diameter of the mounting hole 12 of the tension bolt 10, and a notch 22a is provided at one place from the inner diameter to the outer diameter to form a C-shape. Is formed.

A block 6a which is an intermediate portion of the mounting hole 12 penetrating through the mounting blocks 6a and 4a substantially on the same axis.
And 4a are provided with space-like locking openings 24 and 26 having a diameter larger than the diameter of the mounting hole 12, respectively. The locking openings 24 and 26 are partially open to the outside of the mounting blocks 6a and 4a, the locking surface 12b perpendicular to the axis of the mounting hole 12 is on the mounting block 6a side, and the locking surface 12c is Each is provided on the mounting block 4a side. The annular groove 10 of the tension bolt 10 described above
“b” is disposed so as to be located at a substantially intermediate position between the locking surfaces 12 b and 12 c of the mounting hole 12 and the V-shaped notch 10 a of the tension bolt 10.

Referring to FIGS. 1 to 3 and FIG. 8, the tension bolt 10 of the blade device 2 of the earthmoving vehicle described above.
The operation of the holding means 20 will be described.

First, the attachment of the tension bolt 10 and the holding means 20 to the blade device 2 will be described with reference to FIGS. 2 and 3. The tension bolt 10 is located at the front of the blade device 2 provided at one end of the through-hole 12. The counterbore 12a is inserted into the mounting hole 12 and the mounting hole 1
A nut 50 is attached via a washer 52 to a male screw portion protruding from 2, and the cutting edge support 6 is attached to the blade body 4 as required. The head of the tension bolt 10 is housed in the counterbore 12a to protect the head from being damaged by foreign matter, and has a flat blade front surface. The retaining ring 22 is attached to the two annular grooves 10b of the mounted tension bolt 10 through the locking openings 24 and 26 by expanding the notch 22a.

Next, the cutting and separating of the tension bolt 10 will be described with reference to FIGS. 1 to 3. The work of the earthmoving vehicle is advanced (moving in the direction indicated by an arrow 70 in FIG. 1) during the operation using the blade device 2. When the lower end of the cutting edge 8 disposed at the forward end of the blade device 2 collides with the obstacle 71 on the ground E, the collision attaches the cutting edge 8 about the center axis of the connecting rod 18 due to the collision. An impact force (moment force) is generated to turn the cutting edge support 6 in a predetermined direction indicated by an arrow 72, and this impact force acts on the tension bolt 10. When the impact force acting on the tension bolt 10 is larger than the strength of the tension bolt 10, the tension bolt 10 is cut from the weakest V-shaped notch 10a.

Next, the holding of the separated pieces of the tension bolt 10 cut by the holding means 20 by means 8 will be described. FIG. 8 shows that the blade main body 4 supports the earth-moving vehicle when the tension bolt 10 is cut and separated. A situation is shown in which it has been lifted up by means (not shown). In the mounting hole 12 of the mounting block 6 a provided on the cutting edge support 6, the cut piece separated from the tension bolt 10 is provided with a retaining ring 22 provided on the tension bolt 10 and a locking surface provided on the mounting hole 12. 12b, the cut piece is prevented from coming off from the mounting hole 12, and in the mounting hole 12 of the mounting block 4a provided on the blade body 4, the retaining ring 22 provided on the tension bolt 10 is fitted to the mounting hole 12. The cut piece comes into contact with the provided locking surface 12c to prevent the cut piece from being detached from the mounting hole 12.

FIG. 8 also shows a state of the blade device 2 suitable for an operation of removing the separation piece of the tension bolt 10 from the mounting hole 12. As can be easily understood from the drawing, by removing the retaining ring 22 attached to each separation piece of the tension bolt 10, the mounting hole 1 is removed.
The separation piece held in 2 is easily dropped from the mounting hole 12 and removed.

Next, a holding means 30 as another embodiment of the holding means for the tension bolt 10 will be described with reference to FIGS. Note that portions substantially the same as the holding means 20 shown in FIGS. 2 and 3 are denoted by the same reference numerals. The holding means 30 is the same as the holding means 20 described above except for the following points. In the holding means 30, a wire clip 32 is mounted in place of the retaining ring 22 described above. The wire clip 32 is formed by forming a single elastic wire, such as a piano wire, into a substantially U-shape.
a is fitted and pushed into the annular groove 10b of the tension bolt 10 to hold the annular groove 10b under pressure so that the annular groove 10b does not fall out of the annular groove 10b. The U-shaped bent end 32b is formed so as to be used also as a handle for attachment and detachment. This wire clip 3
Numeral 2 functions as a means for holding the separation piece of the tension bolt 10, just like the retaining ring 22 described above.

Referring to FIGS. 6 and 7, a description will be given of a holding means 40 which is still another embodiment of the holding means. Note that portions substantially the same as the holding means 20 shown in FIGS. 2 and 3 are denoted by the same reference numerals. The holding means 40 is the same as the holding means 20 described above except for the following points.
In the holding means 40, instead of the annular groove 10 b provided in the tension bolt 10, a through-pin hole 44 extending in the diameter direction is formed at the same position in the axial direction as the annular groove 10 b, and a split pin 42 is provided instead of the retaining ring 22. Is inserted, and the end protruding from the through pin hole 44 is bent and held in the through pin hole 44. The split pin 42 also functions as a means for holding the separation piece of the tension bolt 10 just like the retaining ring 22 described above.

[0026] These holding means are appropriately used depending on the frequency of cutting the tension bolts 10 depending on the type of work or the form of work by the dozer device 2 of the earthmoving vehicle, and can be used properly. If the frequency of cutting is relatively high, such as in snow removal work, it is required to immediately re-install the tension bolt 10, and the snap ring 22,
Alternatively, since it is difficult to remove the separation piece of the tension bolt 10 by removing the wire clip 32 or the split pin 42, the snap ring 2 is required to facilitate the work.
2 or the wire clip 32, the annular groove 10
The degree of fitting with b is reduced by, for example, making the groove shallower, and the cut end of the separation piece of the tension bolt 10 is hit with a hammer to punch out the separation piece from the mounting hole 12 and to attach the retaining ring 22 or the wire clip 32. It can be automatically disengaged. By making the retaining ring 22 from a relatively brittle material such as plastic and hitting the cut end of the separating piece with a hammer, the retaining ring 22 can be broken and the separating piece can be punched out of the mounting hole 12.

[0027]

According to the blade device for an earthmoving vehicle constructed in accordance with the present invention, the holding means is provided for preventing the separated piece of the tension bolt cut and separated from coming off from the mounting hole of the tension bolt. The separation piece is prevented from coming out of the mounting hole and being released to the outside.
In snow removal work, which is a typical application of the blade device, the separated pieces do not enter the snow and damage the rotating parts of the blower, auger, etc. of the snow remover, and the separated pieces are removed on the road surface after snow removal. To prevent obstacles to running of high-speed vehicles, etc.
Processing of salt, grains and the like is also facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a blade device of an earthmoving vehicle configured according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a tension bolt holding unit of the blade device.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2;

FIG. 4 is a sectional view showing another embodiment of the tension bolt holding means.

FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4;

FIG. 6 is a sectional view showing still another embodiment of the tension bolt holding means.

FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6;

FIG. 8 is a sectional view showing a state where the tension bolt of the blade device shown in FIG. 1 is cut and separated.

[Explanation of symbols]

 2: Blade device 4: Blade body 6: Cutting edge support 10: Tension bolt 12: Mounting hole 12b, 12c: Locking surface (locking means) 20, 30, 40: Holding means 22: Retaining ring (Locked means) 32: Wire clip (measured means) 42: Split pin (measured means)

Continued on the front page (72) Inventor Keisuke Kishitani 3700 Tana, Sagamihara-shi, Kanagawa Inside CM Custom Products Co., Ltd.

Claims (2)

[Claims] 1. A blade body mounted on an earthmoving vehicle,
A cutting edge support rotatably mounted on the blade body; and a tension bolt for stopping the rotation of the cutting edge support and fixing the cutting edge support to the blade body. In the blade device of the earth-moving vehicle, when the impact of the strength or more acts, the tension bolt is cut and separated, and the cutting edge support can be turned with respect to the blade body. A blade device for an earthmoving vehicle, comprising: holding means for preventing the tension bolt from being detached from a mounting hole. 2. The holding means comprises a locked means provided on the tension bolt, and a locking means provided on the mounting hole, wherein the locking means, the locked means, The blade device for an earthmoving vehicle according to claim 1, wherein axial movement of the tension bolt in the mounting hole is prevented by the tension bolt.