JP3512891B2 - Excavator bucket claw - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket claw which is detachably mounted on an excavator such as a power shovel, and more particularly to a bucket claw which can be used for a long period of time even on highly abrasive soil such as sandstone.

[0002]

2. Description of the Related Art A bucket of an excavator such as a power shovel is provided with a large number of claws for excavating the tip thereof. FIG. 5 shows a standard bucket pawl currently used. The bucket claw 1 includes a wedge-shaped main body portion 11, a hollow portion 12 into which the claw engagement portion is fitted, a hole 13 for fixing the bucket claw portion to the bucket engagement portion, and a cutting edge portion 14. Various types of claws with deformed cutting edges are prepared according to the application. For example, when excavating rocky soil, a claw of a rock bucket with a cutting edge protruding in a spear shape is used.

However, in the case of excavating soil such as sandstone or conglomerate, which is highly abraded to an iron bucket claw, a bucket claw having a flat tip blade edge has only a small amount of excavation and a small excavation amount. However, there is a problem that the blade edge is significantly worn and the life is short. If a spear-shaped rock bucket is used as a bucket claw, the bite is deeply bitten, but there is still a limit to improvement in efficiency. Further, when excavating with a rock bucket, the claw marks are left on the ground as a groove, and it is necessary to smooth the ground surface after excavation in some cases, which is not preferable because the extra work amount increases.

Therefore, an object of the present invention is to provide a bucket claw that can be used with a long life even in highly abrasive soil such as sandstone.

[0005]

As a result of earnest research in view of the above-mentioned object, the present inventor has found that cutting edges are provided inside and outside.
2 pyramid-shaped cutting edges with a roughly rhombic cross section
The V-shaped bifurcated part is attached to the tip of the wedge-shaped claw body.
The bottom of the V-shape formed by the inner cutting edge of the cutting edge is
The present invention was discovered by discovering that the excavation speed can be improved while suppressing wear by matching the tip of the worm-like main body portion with the present invention.

That is, the bucket pawl for an excavator of the present invention has a diamond shape on the inside and the outside so that the whole is substantially diamond-shaped.
The pyramidal cutting edge with a cross section of
The tip is provided with a V-shaped bifurcated shape,
V-shaped bottom formed by the inner cutting edge of the tip of the wedge-shaped body
It is characterized by being formed by edges .

[0007]

Operation and Embodiment FIG. 1 shows an example of a bucket pawl according to the present invention, and FIGS. 2 to 4 show a side surface, a plane and a cross section, respectively. The bucket claw 1 of the present invention includes a main body 11 having a wedge shape and a hollow portion 12 into which a claw engaging portion of a bucket fits.
A hole 13 for fixing with a pin to the bucket engaging portion, and two cutting edge portions 14 provided at the tip of the main body portion 11 in a bifurcated shape.
Consists of.

In this embodiment, each cutting edge portion 14 is a quadrangular pyramid having a substantially rhombic cross section as shown in FIG. Each cutting edge
14 has outer surfaces 14a, 14a that intersect at a large angle and inner surfaces 14b, 14b that intersect at a small angle. Outer side 14
A ridge line 15a formed by intersecting a and 14a projects outward from the tip to the rear end, is located at the outermost point 14c, and is connected to the inclined surface 21a continuous with the side surface 21. On the other hand, the ridge line 15b formed by intersecting the inner side surfaces 14b, 14b is inclined inward at a slightly larger angle than the outer ridge line 15a.
The angle .theta. Formed by the ridge lines 15b, 15b on the inner side of the two cutting edge portions 14, 14 is in the range of about 20.degree. Further, in FIG. 4, the upper and lower ridge lines 16a and 16b respectively project upward and downward, and point 14d and
At 14d, the main body 11 contacts the continuous inclined surfaces 11a, 11a. As described above, each cutting edge portion 14 has a substantially quadrangular pyramid shape having the points 14c and 14d as the outermost ends.

As shown in FIG. 4, the two outer surfaces 14a, 14a
The angle formed by the two inner side surfaces 14b, 14b is smaller than the angle formed by a. The angle between the two outer surfaces 14a, 14a is about 45.
Preferably between 90 ° and 90 °, the two inner surfaces 14b,
The angle formed by 14b is preferably between about 20 ° and 60 °. In this way, the inner cutting edge has a sharper angle than the outer cutting edge of each cutting edge portion 14. In addition, the upper and lower ridge lines 16 in FIG.
The angle α formed by a and 16b is preferably about 20 ° to 40 °. Further, in FIG. 3, the angle β formed by the ridgelines 16a, 16a of the two cutting edges 14, 14 is preferably about 5 ° to 15 °.

When the cutting edge portion 14 having such a shape is used,
Even rocky soil can be easily excavated, with the advantage of low wear during excavation. This is because the rock at the tip of the cutting edge is pushed into both cutting edge parts 14 and 14,
It is considered that this is because it is cut by 15b and 15b.
Further, since the two outer ridge lines 15a and 15a are slightly inwardly inclined toward the tip, there is an advantage that the cutting edge portions 14 and 14 can easily enter the soil.

Since the bucket claw 1 of the present invention is in the shape of a quadrangular pyramid as described above, each surface 14a, 14a, 14b, 14 is excavated.
b is worn on average, and the shape of the quadrangular pyramid hardly changes. Therefore, the problem with the conventional bucket claw that the excavation capacity decreases during use is solved.

The material of the bucket claw 1 is not particularly limited, and it can be integrally manufactured from cast iron, cast steel or the like. Further, the main body portion 11, the hollow portion 12, and the bucket engaging hole 13 can be the same as conventional ones.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this and various modifications can be made without departing from the spirit of the present invention. For example, it is obvious that the shape of the main body can be changed for excavators such as various power shovels, and the size can be changed for buckets of various sizes. In addition, those skilled in the art can easily change the shape that has no new effect.

[0014]

As described above, the bucket pawl according to the present invention has a substantially rhombic cross section as a whole having sharp ridges.
Since it has two quadrangular pyramid-shaped cutting edges , it can be used for a long life even on highly abrasive soil such as sandstone, and has the advantage of a high excavation speed. The bucket claw of the present invention is
It can be widely used for excavators such as power shovels and bulldozers, and other civil engineering machinery.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a bucket pawl for an excavator of the present invention.

FIG. 2 is a partial sectional side view showing an example of an excavator bucket pawl of the present invention.

FIG. 3 is a plan view showing an example of a bucket pawl for an excavator of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view showing an example of a conventional bucket pawl for an excavator.

[Explanation of symbols]

1 ... Bucket claw 11 ... Main body 11a, 21a ... Inclined surface 12 ... Hollow part 13 ... Hole 14 ... Blade edge 14a ... Outer surface 14b ... Inner surface 15a・ ・ ・ Outer ridge line 15b ・ ・ ・ Inner ridge line 16a, 16b ・ ・ ・ Ridge line 21, 21 ′ ・ ・ ・ Side face of main body

Claims (6)

(57) [Claims] 1. A whole body having cutting edges on the inside and the outside.
Has a pyramidal cutting edge with a substantially rhombic cross section.
It is provided in a V-shaped bifurcated shape at the tip of the main body,
The V-shaped bottom formed by the inner cutting edge of the cutting edge is wedge-shaped
A bucket pawl for an excavator, which is formed by the tip of a main body . 2. The bucket pawl for an excavator according to claim 1, wherein the inner cutting edge is sharper than the outer cutting edge of each cutting edge portion.
Bucket claw for excavator characterized by being a corner . 3. The bucket pawl for an excavator according to claim 1 or 2, wherein an angle formed by two outer side surfaces of each cutting edge portion is about
45 ° to 90 °, the angle between the two inner surfaces is about 20 °
Bucket claw for excavator, which is 60 °. 4. The bucket pawl for an excavator according to claim 1, wherein the cutting blades inside the two blade tips are shaped.
The bucket claw for excavator characterized in that the angle formed by the ridgeline is about 20 ° to 60 °. 5. The excavator bucket claw according to any one of claims 1 to 4, a ridge line and the one outer surface of the edge portion and the inner surface is Deki intersects the outer surface of the other edge portion The angle between the ridgeline formed by the intersection of the inner surface and the inner surface is approximately 5 ° to 15 °
Bucket claw for excavator, characterized by being °. 6. The excavator according to claim 1.
The outer cutting edge of the bucket claw is the outermost at the rear end.
Side, and then a tilt that is continuous with the side surface of the main body.
Excavator bucket characterized by being connected to a slope
Nails .