JP2005171612A - Excavation tooth of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bucket having an excavation tooth for facilitating the replacement and storage-management of the tooth, by effectively utilizing a material of the tooth. <P>SOLUTION: This tooth of the bucket is detachably installed on the under surface part tip of the excavation bucket. The tooth is characterized in that a sharp part is arranged in both a tip part and a rear part of the tooth; the tip part and the rear end part are inversely installed to be usable; and a positioning boss is arranged in the center between the tip part and the rear end part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a bucket structure of a construction machine. More specifically, the technique relates to the structure of a tooth (tooth) attached to the tip of the lower surface of the bucket.

  Conventionally, construction machines and civil engineering machines are attached with buckets to enable excavation work. FIG. 4 is a diagram showing a configuration example of a bucket used conventionally. In FIG. 4, a box-shaped recess 31 is provided at the center of the bucket 30, and excavated earth and sand are placed in this portion. Bosses 32 and 33 having pin holes for rotating the bucket 30 by pin-connecting the bucket 30 to a bucket arm (not shown) and a bucket cylinder (not shown) are provided at the upper end. A flat plate member 34 is provided at the bottom of the bucket 30, and an adapter 35 is fixed to the plate member 34 by welding or the like at the tip of the plate member 34, and a tooth (tooth) 36 is attached via the adapter 35. It is detachably attached.

To facilitate excavation work, the tooth 36 needs to be sharp so that the tip of the tooth can easily bite into the ground such as soil. On the other hand, there is a problem that the tooth tip collides frequently with rocks and the like contained in the earth and sand and is easily damaged. Therefore, various ideas related to the tooth and the adapter have been made and proposed. For example, the following patent documents disclose a device relating to a tooth and an adapter.
JP 2002-146850 A (Tooth of bucket and adapter and its mounting structure) JP 2002-121777 A (bucket with tooth plate for construction machine) JP 2001-342649 A (Drilling bucket of construction machine JP-A-10-183698 (excavation bucket device) Japanese Patent Laid-Open No. 10-252106 (Tooth for bucket and method for attaching / detaching the same) JP 2000-104293 A (tooth joint structure of excavation bucket)

  FIG. 5 is a simplified view of the tooth and adapter disclosed in Patent Document 6. In FIG. This will be briefly described below. In FIG. 5, the adapter 35 is fixed to the bottom plate 34 of the bucket 30 by means such as welding. A protrusion 37 is provided at the front end of the adapter 35. In addition, a pin hole 41 penetrating in the lateral direction is provided at substantially the center of the protrusion 37. The pin 43 can be inserted into the pin hole 41, and an elastic body 43a is fixed to a part of the surface thereof. Further, a circumferential groove 43b is provided in which a split ring 44 for fixing after inserting the pin 43 is fitted. On the other hand, the tip of the front end portion of the tooth 36 is pointed to make it easy to bite into the ground, and a recessed hole 39 into which the protrusion 37 can be inserted is provided at the rear end portion. Holes 40, 40 into which pins 43 can be inserted are provided in the wall portions 39 on both sides of the recessed hole 39.

  In this conventional example, the protrusion 37 is inserted all the way into the recessed hole 38 of the tooth 36, and the pin 43 is inserted into the hole 40, the pin hole 41, and the hole 40 after the insertion. A ring 44 is attached and fixed. This mounting operation is performed for all the teeth. As a result, the bucket 30 can easily dig a hole in the ground. In addition, if the tip of the sharp front end of some of the teeth 36 is damaged during the work, the biting of the ground is worsened and the work efficiency is reduced, so the tooth 36 is replaced. To replace the tooth 36, the assembly operation described above is performed in the reverse order, and the tooth 36 is removed from the adapter 35. After the removal, a new tooth 36 may be attached to the removed adapter 35.

In the conventional apparatus described above, if the front end of the tooth is damaged or the like, it must be replaced with a new one. To do so, always bring a new tooth as a spare at the work site or improve the work efficiency. It was a problem because it was necessary to continue working in a bad state. Further, there is a problem that the material is wasted if the damaged tooth is discarded as it is.
Further, not only the above-described conventional apparatus but also the above-described Patent Documents 2 to 6 have similar problems. The present invention has been made to solve such a problem, and employs the following means.

    The present invention employs the following configuration as means for solving the above-described problems. That is, the invention according to claim 1 is a bucket tooth that is detachably attached to the tip of the lower surface portion of the excavation bucket, and the tip portion and the rear end portion are provided with sharp portions at both the tip portion and the rear end portion of the tooth. It is characterized by the fact that it can be installed and used in reverse.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the tooth is provided with a positioning boss at the center of the front end portion and the rear end portion.

  Furthermore, the invention according to claim 3 is the invention according to any one of claim 1 or claim 2, wherein an adapter is fixed to the excavation bucket, and one end of the tooth is provided inside the adapter. A recessed portion into which the boss can be fitted is provided, and a fixing pin hole for fixing the boss to the adapter is provided.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the tooth has a symmetrical shape in the left-right and front-rear directions.

  According to the present invention, a sharpened portion is provided on both the front end portion and the rear end portion of the tooth, and the front end portion and the rear end portion are reversed and can be used. In this case, it is only necessary to install it in the reverse direction, and in this case, it is only necessary to store and bring a new tooth in the construction machine. An effect is obtained. Furthermore, the effect that effective utilization of material is achieved is also acquired.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a tooth embodying the present invention, and FIG. 2 is a perspective view of an adapter. FIG. 3 is a view showing a state in which the tooth is attached to the adapter. In FIG. 1, the tooth 10 includes a front portion 11 and a rear portion 12 with a boss 13 interposed therebetween. The width of the front part 11 and the rear part 12 is configured to be narrower than the width of the boss 13. Further, a sharpened portion 11b is provided at the front end portion 11a of the front portion 11, and at the same time, a sharpened portion 12b is also provided at the rear end portion 12a of the rear portion 12. Further, a pin hole 14 for fixing is provided at a substantially central portion of the boss 13. Note that the tooth 10 is made of steel, and the front end portion 11a and the rear end portion 12a are subjected to a treatment for hardening the surface.

  In FIG. 2, the adapter 20 is provided with a recessed hole 21 on the surface at the front end to fit the boss 13. Pin holes 23 a and 23 b for inserting pins are provided in the upper wall and the bottom wall of the recess hole 21. The surface wall around the pin hole 23a is provided with a shallow recess so that the head of the pin does not protrude from the surface wall when the pin is mounted. Similarly, a shallow recess is formed in the pin hole 23b. Further, a hollow hole 22 having a width narrower than the width of the recessed hole 21 is provided in the back of the recessed hole 21. The portion of the hollow hole 22 is configured to insert and fit the front portion 11 or the rear portion 12 of the tooth 10. As a result, the front wall surface of the hollow hole 22 and the rear wall of the boss 13 come into contact with each other, so that the attachment position of the tooth 10 is accurately determined. For this reason, rattling or the like does not occur. Furthermore, a notch 24 is provided at the rear end of the adapter 20 to be fixed to the bottom plate 25 of the bucket.

  3A is a plan view seen from the upper side of the bucket, and FIG. 3B is a side view. In FIG. 3, the adapter 20 is fixed to the bottom plate 25 of the bucket by welding. The pin holes 23a and 23b are arranged so that the fixing pin 26 is inserted in a state where the rear end surface (or front end surface) of the boss 13 is in contact with the rear wall of the recessed hole 21 when the tooth 10 is inserted into the adapter 20. ing. Instead of the above configuration, the pin holes 14, 23a, and 23b can be configured to be inserted and fixed from the lateral direction.

  As described above, according to the present embodiment, the attaching and detaching operations of the tooth 10 can be performed by simple operations, and the tooth 10 can be attached even when one sharpened portion 11b (or 12b) of the tooth 10 is damaged. It only needs to be installed in reverse, and there is no need to replace it with a new tooth. Therefore, the effect of facilitating the management of the tooth can be obtained. Further, since the sharpened portions are provided at both ends of the tooth, even if one sharpened portion 11b is damaged, the other sharpened portion can be used, so that an effect of saving material can be obtained. Further, since the boss 13 is located in the recessed hole 21 of the adapter 20, there is an effect that it is not affected by wear due to excavation during work and the life is extended.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the technical scope of the present invention is not limited to this, and even if there is an improvement or a change that is substantially regarded as the same technology, Belongs to the technical scope. For example, a case where the front part and the rear part are configured symmetrically around the boss, or a case where the fixing pin is fixed through the side surface of the boss also belongs to the technical scope of the present invention.

1 shows a perspective view of a tooth embodying the present invention. The perspective view of the adapter which implemented this invention is shown. The assembly figure at the time of mounting | wearing the adapter with the tooth by this embodiment is shown. The block diagram of the bucket in a conventional apparatus is shown. The block diagram of the conventional tooth and adapter is shown.

Explanation of symbols

10 tooth 11 tooth front part 12 tooth rear part 11b, 12b tooth sharp part 14 boss 20 adapter 21 boss fitting recessed hole 22 cavity hole

Claims (4)

In the tooth of the bucket that is detachably attached to the tip of the bottom surface of the excavation bucket, the tip and the rear end of the tooth are provided with a sharp portion, and the tip and the rear end can be attached in reverse and used. Tooth for excavation of construction machinery, characterized by The tooth for excavation of a construction machine according to claim 1, wherein a positioning boss is provided in the center of the front end and the rear end. An adapter is fixed to the excavation bucket, and one end of the tooth and a dent capable of fitting the boss are provided inside the adapter, and a fixing pin hole for fixing the boss to the adapter is provided. The tooth for excavating a construction machine according to claim 2. The tooth for excavation of a construction machine according to any one of claims 1 to 3, wherein the tooth has a symmetrical shape in the left-right and front-rear directions.

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