JP2006322206A - Excavation bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavation bucket capable of preventing the inside adhesion of sediment by compaction, by a simple constitution. <P>SOLUTION: This excavation bucket 1 has a contour shape of storing an excavated object in an inner space, and has a baseplate 10 forming the innermost wall surface and the bottom surface of the inner space, and a pair of side plates 11 and 11 respectively fixed to both right and left ends of the baseplate 10 and forming the side surface of the inner space. The innermost part 1b is formed wider than an opening 1a of the inner space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an excavation bucket suitable for use in a work machine such as a hydraulic excavator.

  In excavation work using a work machine such as a hydraulic excavator, a standard bucket is generally used as a work tool. A standard bucket (hereinafter simply referred to as a bucket) is a container-like shape having a substantially C-shaped base plate in side view and side plates fixed to the left and right ends of the base plate so as to close both side surfaces of the base plate. It is a work tool and has a shape suitable for temporarily storing the excavated earth and sand at the same time as excavating the earth and sand.

  By the way, in excavation work, for example, when soil such as highly viscous soil (clay) is excavated, such viscous soil tends to adhere to the bottom and side portions (inside the bucket) of the bucket inner peripheral surface. And, when the earth and sand are attached inside the bucket, the capacity of the bucket is reduced by the volume of the attached earth and sand, so the amount of earth and sand that can be excavated in one bucket is substantially reduced, Excavation efficiency will decrease.

Moreover, in excavation work, the earth and sand contained in the bucket is usually moved to a place different from the place where the bucket was excavated and turned over and discharged by natural fall. The earth and sand adhere to each other due to their viscosity and form a relatively large lump, making it difficult to fall.
For this reason, for example, with the bucket turned upside down, the bucket is repeatedly and suddenly activated, or the bucket is hit against a hard structure, and the bucket is shocked so that the earth and sand are separated from each other or earth and sand. It is necessary to cause the soil to leave each other to drop and discharge, or to manually discharge the soil and sand adhered by the operator using a scoop etc., but it may take time to be discharged, work efficiency Will fall.

In response to such a problem, for example, Patent Document 1 discloses forming a cross-sectional area restricting portion on a peripheral surface inside the bucket as a technique for easily dropping and discharging the earth and sand inside the bucket. In this technique, the side wall (side plate) of the bucket is disposed so as to be narrower toward the back, and a ridge body is provided on the inner surface of the side wall of the bucket to reduce the cross-sectional area of the earth and sand entering the bucket. It is like that. That is, by passing a lump of soil (soil lump) between the ridges, the lateral width of the soil lump inside the bucket is reduced, and the soil lump can be easily peeled from the inside of the bucket.
Japanese Patent Laid-Open No. 9-316913

  However, in the technique described in Patent Document 1, since it is necessary to provide a protrusion on the side wall of the bucket, for example, when forming the side wall of the bucket using a steel plate, a member that forms the protrusion is welded to the side wall. Or the side walls have to be bent, which increases the manufacturing process and cost. In addition, since the protruding portion protrudes into the bucket, the protruding rod becomes an obstacle when the earth and sand enters the bucket, and there is a possibility that the earth and sand may adhere to the protruding body.

Furthermore, for example, in the shape of the bucket described in Patent Document 1 such that the side surface becomes narrower toward the back than the opening, the earth and sand that has entered the inside of the bucket starts from the side wall of the bucket as it proceeds from the opening to the back. Since the pressure received is increased and consolidated, it tends to adhere to the side and bottom of the inner peripheral surface of the bucket.
The present invention has been devised in view of such problems, and an object of the present invention is to provide a bucket for excavation that has a simple configuration and that can prevent internal adhesion of earth and sand due to consolidation.

  In order to achieve the above object, the excavation bucket of the present invention according to claim 1 is an excavation bucket having an outer shape for accommodating excavated excavated material in the inner space, the inner wall of the inner space, A base plate that forms a bottom surface and a pair of side plates that are fixed to the left and right ends of the base plate to form side surfaces of the inner space, and the inner space is formed wider at the back than at the opening. It is characterized by being.

The excavation bucket according to a second aspect of the present invention is the excavation bucket according to the first aspect, wherein the inner space has a dimension in the inner width direction of the pair of side plates that is closer to the inner side than the opening. It is characterized in that the back portion is formed wider than the opening by being formed larger on the side.
The excavation bucket according to a third aspect of the present invention is the excavation bucket according to the second aspect, wherein the pair of side plates are configured such that the inner surfaces of the pair of side plates gradually increase from the opening toward the back. The base plate is inclined and fixed to both left and right ends.

The excavation bucket according to a fourth aspect of the present invention is the excavation bucket according to any one of the first to third aspects, wherein the pair of side plates are uniform from the opening to the back. It is characterized by having a thickness.
The excavation bucket according to a fifth aspect of the present invention is the excavation bucket according to any one of the first to third aspects, wherein the pair of side plates gradually increase in thickness from the opening toward the back. It is characterized by being formed in a tapered shape that becomes thinner.

The excavation bucket according to a sixth aspect of the present invention is the excavation bucket according to any one of the first to fifth aspects, wherein the pair of side plates are formed such that outer surfaces thereof are parallel to each other. It is characterized by being.
The excavation bucket according to a seventh aspect of the present invention is the excavation bucket according to any one of the first to sixth aspects, wherein the excavation bucket is fixed to an opening end portion of the pair of side plates, and the string of the base plate A pair of side cutter plates extending in the direction to reinforce the opening, and the pair of side cutter plates are formed to be thicker than the pair of side plates, and the inner surface thereof is more than the inner surface of the side plate. Is also characterized by being fixed in a state shifted to the inside.

The excavation bucket according to an eighth aspect of the present invention is the excavation bucket according to the seventh aspect, wherein the outer surface of the side cutter plate is disposed on the same plane as the outer surface of the opening end of the side plate. It is characterized by being.
The excavation bucket according to a ninth aspect of the present invention is the excavation bucket according to any one of the first to eighth aspects, wherein the excavation bucket is fixed to a bottom-side opening end of the base plate, and the pair of side plates An edge plate that extends in the internal width direction and reinforces the opening is provided, and the edge plate is formed to be thicker than the base plate, and the inner surface thereof is shifted inward from the inner surface of the base plate. It is characterized by being fixed.

The excavation bucket of the present invention according to claim 10 is the excavation bucket according to claim 9, characterized in that the outer surface of the edge plate is arranged on the same surface as the outer surface of the base plate.
An excavation bucket according to an eleventh aspect of the present invention is the excavation bucket according to any one of the first to eighth aspects, wherein the excavation bucket is fixed to a bottom side opening end of the base plate, and the pair of side plates An edge plate extending in the inner width direction to reinforce the opening is provided, and the base plate has a bulging portion that protrudes outward from the inner surface of the edge plate at the bottom surface portion. It is characterized by.

According to the excavation bucket of the present invention, since the inner space of the bucket is formed wider in the back than the opening, the bucket of earth and sand entering the back from the opening of the bucket The pressure received from the inner surface can be reduced, and the compaction of earth and sand can be suppressed. Therefore, it becomes possible to prevent the adhesion of earth and sand due to consolidation.
According to the excavation bucket of the present invention, the inner space of the bucket is formed such that the inner width of the pair of side plates is larger on the back side than on the opening side. In the inner space, compaction of earth and sand in the side surface direction (left-right direction) can be suppressed. Further, the inner space of the bucket can be easily formed wider than the opening with a simple configuration.

According to the excavation bucket of the present invention described in claim 3, the pair of side plates are inclined at the inner and lower ends of the base plate so that the inner surfaces thereof are gradually inclined from the opening toward the back. Since it is fixed, the inner width of the pair of side plates can be formed more easily on the back side than on the opening side.
According to the excavation bucket of the present invention, the side plate having a uniform thickness is used, so that the bucket can be formed at a low cost.

According to the excavation bucket of the present invention, the pair of side plates are tapered in thickness, so that the inner space of the bucket is formed wider at the back than at the opening. The outer surface shape can be easily changed.
According to the excavation bucket of the present invention described in claim 6, since the pair of side plates are formed so that the outer surfaces thereof are parallel to each other, the outer surfaces of the side plates are parallel to the excavation direction. The resistance is reduced, and wear on the side outer surface of the bucket can be suppressed.

  According to the excavation bucket of the present invention, the pair of side cutter plates are provided at the opening ends of the pair of side plates, the side cutter plates are formed thicker than the side plates, Since it is displaced so as to protrude inward from the inner surface of the plate, the inner space of the bucket can be formed wider in the side surface direction than the opening portion with a simple configuration. Sediment consolidation can be suppressed.

According to the excavation bucket of the present invention described in claim 8, since the outer surface of the side cutter plate and the outer surface of the side cutter plate are arranged on the same surface, the inner space of the bucket is located at the back of the opening rather than the opening. Can be formed more widely.
According to the excavation bucket of the present invention according to claim 9, the edge plate is provided at the bottom side opening end of the base plate, the edge plate is formed thicker than the base plate, and the inner surface of the edge plate is the inner surface of the side cutter plate. The inner space of the bucket can be formed wider in the vertical direction than in the opening with a simple configuration in the vertical direction, so that the sand compaction in the vertical direction can be achieved. Can be suppressed.

According to the excavation bucket of the present invention according to claim 10, since the outer surface of the edge plate and the outer surface of the base plate are arranged on the same surface, the inner space of the bucket is more deeper than the opening. Can be widely formed.
According to the excavation bucket of the present invention as set forth in claim 11, since the bulging portion is formed at the bottom surface portion of the base plate, the inner space of the bucket in the vertical direction has a simple configuration and is deeper than the opening portion. Therefore, it is possible to suppress the compaction of earth and sand in the vertical direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 3 show a bucket for excavation according to a first embodiment of the present invention, FIG. 1 is a schematic side view thereof, FIG. 2 is a sectional view taken along arrow AA in FIG. 1, and FIG. It is a typical exploded perspective view of a bucket.

  As shown in FIGS. 1 to 3, the excavation bucket 1 includes a base plate 10 that is curved in a substantially C shape in a side view, and a flat plate in which one end portions 11 a and 11 a are welded to left and right end portions 10 a and 10 b of the base plate 10. A pair of left and right side plates 11, 11 and a pair of left and right side cutter plates 12, which are welded to the other end portions 11b, 11b of the pair of side plates 11, 11 and extend in the chord direction of the base plate 10. 12 and a pair of side cutter plates 12, 12, the rear end portion 13 a is welded to the lower end portion 10 c of the base plate 10 and extends in the left-right direction, and the tip of the edge plate 13. It comprises a plurality of teeth 14 mounted on the part. In FIG. 3, the tooth 14 is not shown for convenience. The chord direction is a chord direction corresponding to a C-shaped arc of the base plate 10.

  The side plate 11 and the side cutter plate 12 form the side surface of the bucket 1, and the base plate 10 and the edge plate 13 form the bottom surface of the bucket 1. The base plate 10 also has a back wall surface. The excavation bucket 1 accommodates excavated earth and sand in an inner space surrounded by an outer wall formed by a base plate 10, an edge plate 13, a pair of left and right side plates 11, 11, and a pair of left and right side cutter plates 12, 12. It is supposed to do. As shown in FIG. 1, the inner space is configured to have an opening 1a facing the outside of the bucket 1 and a back portion 1b on the inner side (in the direction of arrow B in FIG. 1) than the opening 1a. .

  Here, as shown in FIG. 3, the one end 11a and the other end 11b of the side plate 11 are, as shown in FIG. 3, one end 11a of the outer side of the side plate 11, that is, the arc-shaped one side 11a and the linear one side 11b. Indicates an arc-shaped side on the back 1b side, and the other end 11b indicates a linear side on the opening 1a side. Note that one end portion 12a of the side cutter plate 12 indicates one side on the back portion 1b side of the outer side (four sides) of the side cutter plate 12, and the other end portion 12b indicates one side on the opening portion 1a side. Further, the lower end portion 10c of the base plate 10 indicates one side of the opening 1a side and the bottom surface side (the lower side in the vertical direction shown in FIG. 1), and the back end portion 13a of the edge plate 13 indicates one side of the back portion 1b side.

As shown in FIG. 2, the thickness D ₁₂ of the side cutter plate 12 is formed thicker greater than the thickness D ₁₁ of the side plate _{11 (D 12> D 11)} . As a result, the periphery of the opening 1a is reinforced, and the strength of the excavation bucket 1 against deformation or the like is improved. Similarly, as shown in FIG. 1, the plate thickness D ₁₃ of the edge plate 13 is formed larger than the plate thickness D _{10 of the} base plate 10 (D ₁₃ > D ₁₀ ), and the periphery of the opening 1 a is reinforced, deformed, etc. The strength against is improved.

Here, as a feature of the present embodiment, as shown in FIG. 3, the width of the base plate 10 is formed such that the width W _10b in the back portion 1b is larger than the width W _10a on the opening 1a side. That is, as shown in FIG. 2, toward the opening 1a to the back portion 1b, so that the lateral width W ₁₀ of gradually wider, and is formed in a substantially trapezoidal shape in top view. The edge plate 13, toward the opening 1a to the inner portion 1b side, as the width W ₁₃ in the lateral direction becomes gradually wider, and is formed in a substantially trapezoidal shape in top view.

The side plate 11 and the side cutter plate 12 have dimensions (inner surface) in the inner width direction from the other end portions 11b and 12b toward the one end portions 11a and 12a, that is, from the opening 1a to the back portion 1b. as the width and the plate 11, 12 distance) W _11, W ₁₂ between the gradually increases, by inclining their inner surfaces are welded to the base plate 10 and the edge plate 13. That is, the inner space of the bucket 1 gradually becomes wider from the opening 1a toward the back 1b. Of course, since the bucket 1 is bilaterally symmetric, the inner surfaces of the side plates 11 are slightly tilted toward the inner space 1b.

The excavation bucket according to the first embodiment of the present invention is configured as described above, and thus has the following operations and effects.
The inner space surrounded by the base plate 10, the edge plate 13, the pair of left and right side plates 11, 11 and the pair of left and right side cutter plates 12, 12 of the bucket 1 is formed so that the inner portion 1 b is wider than the opening 1 a. Therefore, the earth and sand that has entered from the opening 1a of the bucket 1 are not consolidated because the pressure received from the inner surface of the bucket when further entering the back 1b is reduced. Therefore, adhesion of earth and sand to the inside of the bucket 1 can be reduced.

Further, the inner space of the bucket 1 has a simple configuration in which the inner surface width W11 of the pair of side plates 11 and ₁₁ is formed larger on the back side 1b than on the opening side 1a, and is deeper than the opening 1a. The portion 1b can be formed wider.
The pair of side plates 11 and 11 are fixed to the left and right end portions 10a and 10b of the base plate 10, respectively, with the inner surfaces thereof inclined so that the distance gradually increases from the opening 1a toward the back portion 1b. As a result, the inner space of the bucket 1 can be formed sufficiently wider in the back portion 1b than in the opening portion 1a.

In addition, it is preferable to use the bucket 1 of this embodiment with respect to soil properties with high viscosity, such as soft ground and clay, which have low excavation resistance and poor soil separation.
Moreover, although the bucket 1 of this embodiment has described the inner surface of each side plate 11 with large inclination in FIG. 2, this inclination may be very small.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic cross-sectional view showing the excavation bucket according to the second embodiment of the present invention.
Also in this embodiment, as in the first embodiment, the excavation bucket 2 has a base plate 20 that is curved in a substantially C shape in a side view, and one end portion on both left and right ends of the base plate 20 as shown in FIG. A pair of welded flat left and right side plates 21 and 21, and a pair of flat left and right side cutter plates 22 and 22 that are welded to the other ends of the pair of side plates 21 and 21 and extend in the chord direction; The rear end portion is welded to the lower end portion of the base plate 20 located between the pair of side cutter plates 22, 22, and is attached to the front end of the edge plate 23, and the flat edge plate 23 extending in the left-right direction. A plurality of teeth 24 are provided. The plate thickness of the side cutter plate 22 is formed larger than the plate thickness of the side plate 21, and the plate thickness of the edge plate 23 is formed larger than the plate thickness of the base plate 20.

Here, as a feature of this embodiment, the lateral width W ₂₀ of the base plate 20 is uniformly or substantially uniformly formed from the opening 2a side over the inner portion 2b. The width W ₂₃ of the edge plate 23, like the width W ₂₀ of the base plate, from the opening 2a over the rear portion 2b side are uniformly or substantially uniformly formed, the edge plate 23 is a rectangular flat plate It is configured. The pair of side plates 21 and 21 are welded to the base plate 20 in parallel or substantially parallel to each other, and the pair of side cutter plates 22 are also welded to the pair of side plates 21 and 21 in parallel or substantially parallel to each other. .

Further, the outer surface 21 _OUT of the side plate 21 and the outer surface 22 _OUT of the side cutter plate 22 are arranged on the same surface, and one end of the side cutter plate 22 is welded to the other end portion of the side plate 21. That is, the side plate 21 and the side cutter plate 22 are welded with the outer surfaces 21 _OUT and 22 _OUT being combined and the inner surfaces 21 _IN and 22 _IN being shifted.

Since the excavation bucket according to the second embodiment of the present invention is configured as described above, there are the following operations and effects.
The pair of side plates 21 and 21 and the pair of side cutter plates 22 and 22 are arranged in parallel with each other, and at the same time, the outer surfaces 21 _OUT and 22 _OUT are aligned and the inner surfaces 21 _IN and 22 _IN are shifted and welded. Therefore, compared to the inner space in the opening 2 a surrounded by the edge plate 23 and the side cutter plate 22, the inner space in the inner portion 2 b surrounded by the side plate 21 and the base plate 20 is in the lateral direction of the bucket 2. Become wider.
Therefore, the sand and sand that has entered from the opening 2a of the bucket 2 is not consolidated even if it further advances toward the inner part 2b of the bucket 2 (inner space), and the adhesion of sand and sand to the inside of the bucket 2 is reduced. Can do.

Further, the side cutter plate 22 is formed thicker than the side plate 21 and is welded so that its inner surface 22 _IN is shifted so as to protrude inward from the inner surface 21 _IN of the side plate 21. The back portion 2b can be formed wider than the opening 2a with a simple structure.
Further, since the outer surface 22 _OUT of the side cutter plate 22 and the outer surface 21 _OUT of the side plate 21 are formed in parallel to each other, the outer surfaces 21 _OUT and 22 _OUT are parallel to the excavation direction, and the excavation resistance is reduced. Thus, wear of the side outer surfaces 21 _OUT and 22 _OUT of the bucket 2 can be suppressed.

In the present embodiment, the side plate 21 and the side cutter plate 22 are welded with the outer surfaces 21 _OUT and 22 _OUT being aligned and the inner surfaces 21 _IN and 22 _IN being shifted, but the outer surfaces 21 _OUT and 22 _OUT are particularly welded. Without matching, the side plate 21 may be welded to the side cutter plate 22 with its inner surface 21 _IN shifted to the outer surface 21 _OUT side. Even in such a configuration, the inner space in the inner portion 2b surrounded by the side plate 21 and the base plate 20 is wider than the inner space in the opening 2a surrounded by the edge plate 23 and the side cutter plate 22. Therefore, the earth and sand that has entered from the opening 2a of the bucket 2 is not consolidated even if it further enters the inner part 2b of the bucket 2 (inner space), and the adhesion of earth and sand to the inside of the bucket 2 is reduced. be able to.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic side view showing a bucket for excavation according to a third embodiment of the present invention. In the first embodiment and the second embodiment, by setting the side surface shape in the bucket, the back part is formed wider than the opening, but in this embodiment, by setting the bottom surface shape in the bucket, The back part is formed wider than the opening part.

Also in this embodiment, the excavation bucket 3 includes a base plate 30 curved in a substantially C shape in a side view and left and right ends welded to both left and right ends of the base plate 30, as in the first and second embodiments. A pair of side plates 31, 31, a pair of left and right side cutter plates 32, 32 that are welded to the other ends of the pair of side plates 31, 31 and extend in the chord direction, and a pair of side cutter plates 32 , 32 and having a rear end welded to the lower end of the base plate 30 and extending in the left-right direction, and a plurality of teeth 34 attached to the tip of the edge plate 30 Has been. The thickness of the side cutter plate 32 is formed larger than the thickness of the side plate 31, the plate thickness D ₃₃ of the edge plate 33 is formed larger than the thickness D ₃₀ of the base plate 30 (D _33> D ₃₀ ).

Here, as a feature of the present embodiment, the lower surface 30 _OUT of the base plate 30 and the lower surface 33 _OUT of the edge plate 33 are arranged on the same surface at the lower end of the base plate 30, and the back end of the edge plate 33 is welded. ing. That is, the base plate 30 and the edge plate 33 are welded with the lower surfaces 30 _OUT and 33 _OUT being combined and the upper surfaces 30 _IN and 33 _IN being shifted.

The excavation bucket according to the third embodiment of the present invention is configured as described above, and thus has the following operations and effects.
Since the base plate 30 and the edge plate 33 are welded with the lower surfaces 30 _OUT and 33 _OUT being aligned and the upper surface 33 _OUT being shifted, compared with the inner space in the opening 3 a surrounded by the edge plate 33 and the side cutter plate 32. Thus, the inner space in the inner portion 3 b surrounded by the side plate 31 and the base plate 30 becomes wider in the lower direction of the bucket 3.
Accordingly, the sand and sand that has entered from the opening 3a of the bucket 3 is not consolidated even if it further advances toward the inner part 3b of the bucket 3 (inner space), and the adhesion of earth and sand to the bucket 3 is reduced. Can do.

In the present embodiment, the base plate 30 and the edge plate 33, the lower surface 30 _OUT, 33 _OUT alignment, have been welded by shifting the upper surface 30 _IN, 33 _IN, in particular without matching the lower surface 30 _OUT, 33 _OUT The base plate 30 may be welded to the edge plate 33 with its upper surface 30 _IN shifted to the lower surface 30 _OUT side. Even in such a configuration, the inner space in the inner portion 3b surrounded by the side plate 31 and the base plate 30 is wider than the inner space in the opening 3a surrounded by the edge plate 33 and the side cutter plate 32. Therefore, the earth and sand that has entered from the opening 3a of the bucket 3 is not consolidated even if it further advances toward the inner part 3b of the bucket 3 (inner space), and the adhesion of earth and sand to the inside of the bucket 3 is reduced. be able to.

In addition, as shown in FIG. 6, the bulging portion 35 may be formed so as to protrude from the inner surface of the edge plate 33 to the outer surface side at the bottom surface portion of the base plate 30. In this case, the upper surface 30 _{IN of the} base plate 30 and the upper surface 33 _IN of the edge plate 33 preferably coincide with each other. The bottom end of the bulging portion 35 is preferably formed so as to be positioned on the extension line of the lower surface 33 _OUT of the edge plate 33 so that the bulging portion 35 is formed large. Even in such a configuration, since the inner space in the back portion 3b is wider than the opening 3a, the earth and sand are not consolidated and adhesion to the bucket 3 is reduced.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic sectional view showing a bucket for excavation according to a fourth embodiment of the present invention.
This embodiment is a modification of the bucket for excavation of the first embodiment, and is different in terms of the thickness of the side plate and the side cutter plate.
That is, as in the first embodiment, the bucket 4 of this embodiment includes a base plate 40 that is curved in a substantially C shape in a side view, and a pair of left and right side plates that are welded at one end to the left and right ends of the base plate 40. 41, 41 and a pair of left and right side cutter plates 42, 42 welded to the other end of the pair of side plates 41, 41 and extending in the chord direction, and a pair of side cutter plates 42, 42 The bottom end of the base plate 40 is welded to the back end, and includes an edge plate 43 extending in the left-right direction, and a plurality of teeth 44 attached to the tip of the edge plate 43.

However, this embodiment differs from the first embodiment in that the plate thickness D ₄₁ of the side plate 41 is not uniform. That is, the thickness D ₄₁ of the side plate 41 is formed in a tapered shape with an inclination so as to gradually decrease from the opening 4a toward the back 4b. Further, the side cutter plate 42 is also formed so that its thickness D ₄₂ is tapered with the same inclination as the side plate 41.

The inner surface 41 _IN of the side plate 41 and the inner surface 42 _IN of the side cutter plate 42 are smoothly continuous, and the width of the inner surface is increased from the opening 4a toward the back 4b. . Further, the outer surface 41 _OUT of the side plate 41 and the outer surface 42 _OUT of the side cutter plate 42 are smoothly continuous, and the pair of outer surfaces 41 _OUT and 42 _OUT are parallel to each other as indicated by solid lines in FIG. It is arranged to become.

The excavation bucket according to the fourth embodiment of the present invention is configured as described above, and thus has the following operations and effects.
As in the first embodiment, the inner space surrounded by the base plate 40, the edge plate 43, the pair of left and right side plates 41, 41, and the pair of left and right side cutter plates 42, 42 is located in the back part 4b rather than the opening 4a. Therefore, the sand and sand that has entered from the opening 4a of the bucket 4 is not consolidated even if it further enters the inner portion 4b of the bucket 4 (inner space). The adhesion of earth and sand to the inside can be reduced.

At the same time, the outer surface of the side portion of the bucket 4, that is, the outer surfaces 41 _OUT and 42 _{OUT of} the side plate 41 and the side cutter plate 42 are formed so as to be parallel to the excavation direction. The wear of the side surface of the bucket can be suppressed.
In the present embodiment, the side plates 41 and side cutter plate 42 is the outer surface 41 _OUT, 42 _OUT respectively are parallel to each other, as shown in FIG. 7 by a two-dot chain line, opposite outer surface 41 _OUT , 41 _OUT (42 _OUT , 42 _OUT ) may be formed so that the interval gradually decreases from the opening 4a toward the back 4b.

In the bucket 4 of this embodiment, in FIG. 7, the inner surfaces 41 _IN and 42 _IN of the side plates 41 and the side cutter plates 42 are both given a large inclination, but this inclination is very small. May be.

[Others]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, a structure in which the first to fourth embodiments are appropriately combined may be used. That is, for example, the first embodiment may be combined with the second embodiment and the third embodiment. Specifically, each of the side plate and the side cutter plate is inclined so that the internal width dimension gradually increases from the opening toward the back (first embodiment), and the outer surfaces thereof are aligned. The inner surface is displaced (a part of the second embodiment), and the base plate and the edge plate are disposed with the lower surface aligned and the upper surface shifted (third embodiment). Depending on the setting of both bottom shapes, it may be wider at the back than at the opening.

It is a typical side view showing the bucket for excavation concerning a 1st embodiment of the present invention. It is an AA arrow sectional view of Drawing 1 showing the bucket for excavation concerning a 1st embodiment of the present invention. It is a typical exploded perspective view showing the bucket for excavation concerning a 1st embodiment of the present invention. It is typical sectional drawing which shows the bucket for excavation which concerns on 2nd Embodiment of this invention. It is a typical side view which shows the bucket for excavation which concerns on 3rd Embodiment of this invention. It is a typical side view which shows the bucket for excavation which concerns on the modification of 3rd Embodiment of this invention. It is typical sectional drawing which shows the bucket for excavation which concerns on 4th Embodiment of this invention.

Explanation of symbols

1, 2, 3, 4 bucket (excavation bucket)
1a, 2a, 3a, 4a Opening portion 1b, 2b, 3b, 4b Back portion 10, 20, 30, 40 Base plate 10a, 10b Left and right end portions 10c Lower end portion (bottom side opening end portion)
10d Upper end 11, 21, 31, 41 Side plate 11a One end 11b The other end (open end)
12, 22, 32, 42 Side cutter plate 12a One end portion 12b Other end portion 13, 23, 33, 43 Edge plate 13a Back end portion 14, 24, 34, 44 Tooth 35 bulging portion

Claims (11)

An excavation bucket having an outer shape for accommodating excavated excavated material in an inner space,
A base plate that forms the back wall surface and bottom surface of the inner space;
A pair of side plates fixed to the left and right ends of the base plate, respectively, forming side surfaces of the inner space;
The excavation bucket is characterized in that the inner space is formed wider at the back than at the opening. The inner space is formed such that the dimension of the pair of side plates in the inner width direction is larger on the back side than on the opening side, so that the back part is wider than the opening part. The excavation bucket according to claim 1, wherein the excavation bucket is formed. The pair of side plates are fixed to the left and right ends of the base plate, respectively, with the inner surfaces thereof inclined so that the distance gradually increases from the opening toward the back. The excavation bucket according to claim 2. The excavation bucket according to any one of claims 1 to 3, wherein the pair of side plates have a uniform thickness from the opening to the back. 4. The pair of side plates according to claim 1, wherein the pair of side plates are formed in a tapered shape that gradually decreases in thickness from the opening toward the back. 5. Bucket for excavation. The excavation bucket according to any one of claims 1 to 5, wherein the pair of side plates are formed so that outer surfaces thereof are parallel to each other. A pair of side cutter plates fixed to the opening ends of the pair of side plates, respectively, extending in the chord direction of the base plate and reinforcing the opening;
The pair of side cutter plates are formed thicker than the pair of side plates, and the inner surfaces of the pair of side cutter plates are fixed in a state of being displaced inward from the inner surface of the side plate. The bucket for excavation in any one of 1-6. The excavation bucket according to claim 7, wherein an outer surface of the side cutter plate is disposed on the same plane as an outer surface of the opening end portion of the side plate. An edge plate that is fixed to a bottom side opening end of the base plate and extends in the inner width direction of the pair of side plates to reinforce the opening,
The said edge plate is thickly formed rather than the said base plate, The inner surface is fixedly installed in the state which shifted | deviated to the inner side rather than the inner surface of the said base plate, The any one of Claims 1-8 characterized by the above-mentioned. The excavation bucket according to item. The excavation bucket according to claim 9, wherein an outer surface of the edge plate is disposed on the same surface as an outer surface of the base plate. An edge plate that is fixed to a bottom side opening end of the base plate and extends in the inner width direction of the pair of side plates to reinforce the opening,
9. The excavation according to claim 1, wherein the base plate has a bulging portion projecting outward from the inner surface of the edge plate at a bottom surface portion thereof. bucket.

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