JP3881358B2 - Tooth removal tool for bucket - Google Patents

Description

The present invention relates to a tooth attaching / detaching tool which is an excavating tooth that can be freely attached to and detached from a bucket.

A well-known bucket equipped with, for example, a hydraulic excavator or the like in which the tooth attaching / detaching tool according to the present invention is used will be described with reference to FIG. The bucket indicated by number 2 includes a plurality of teeth 4 that are a plurality of excavating teeth that can be freely attached to and detached from a plurality of adapters 6 that are a plurality of tooth holders that are integrally adjacent to the bucket body. (For example, refer to Patent Document 1).

The attachment of the tooth 4 and the adapter 6 is performed by fitting the concave portion of the tooth 4 at the tip of the adapter 6 and inserting the holding pin 8 into each of the through holes penetrating both. When the holding pin 8 is inserted, the holding pin 8 is passed through a ring-shaped retainer provided at the end of the through hole of the adapter 6 in a tightly fitted state, and the position thereof is fixed.

The plurality of adapters 6 to which the tooth 4 is attached are welded and joined to the end of the flat cutting edge 10 of the bucket body at a predetermined interval. The plurality of sets of adapters 6 and the through holes of the teeth 4 and the holding pins 8 are disposed on substantially the same axis X.

By attaching the tooth 4 detachably to the bucket 2 via the adapter 6, various types of sizes and sizes such as replacement of a worn tooth with a new one, standard type / reinforced type, etc. according to work using the bucket 2 The attachment of the tooth can be performed appropriately.
JP 2000-104293 A

However, the conventional bucket having the above-described form has the following problems to be solved in connection with the attachment / detachment of the tooth 4, that is, the attachment / detachment of the holding pin 8.

When attaching / detaching the tooth 4 to / from the adapter 6, the distance between the adjacent teeth 4 is relatively narrow. Therefore, as shown in FIG. 5, as shown in FIG. The holding pin 8 is hit with a hammer or the like from an oblique direction, and the holding pin 8 is inserted into or removed from the through hole. Therefore, it is difficult to drive the holding pin 8, and an extra force is required because the holding pin 8 cannot be hit in the direction of the axis X.

Also, when the holding pin 8 is driven and inserted due to the structure of the tooth attachment portion, it is necessary to hold the holding pin 8 together with the burl 12 by hand. Therefore, the striking work is difficult to do.

If a bar-like tool such as a bar passing through a plurality of through holes on the axis X is used, the holding pin 8 can be hit in the direction of the axis X. However, such a tool such as a bar is long and suitable for factory facilities, but is unsuitable for use at work sites, users and the like because it is long and difficult to store and is heavy and difficult to use.

The present invention has been made in view of the above facts, and its technical problem is to penetrate through a plurality of combinations of a plurality of adapters of a bucket and a tooth fitted to each of the buckets by substantially the same axis. Provided is a tooth attaching / detaching tool that can be easily attached and detached, and can be easily handled and stored when a holding pin is inserted into and removed from each hole and the tooth is freely attached to and detached from the adapter. That is.

According to the present invention, as a tooth attaching / detaching tool for solving the above technical problem, a tooth is fitted to each of a plurality of adapters protruding adjacent to a bucket, and a plurality of sets of adapters and teeth are substantially the same axis. A tool for attaching and detaching the tooth to and from the adapter by inserting and removing the holding pin in each of the through-holes penetrating through the adapter, and a main body extending straightly between a pair of adjacent teeth, and the main body A protrusion that extends integrally between a pair of teeth from approximately the middle in the direction in which the portion extends, and a recessed hole that extends in the axial direction and opens at a position corresponding to the axis of the protrusion. One end of the holding pin is inserted and held in the recessed hole, the other end is positioned at the end of the through hole, one end of the main body is hit, and the holding pin is inserted into the through hole, so that the tooth is attached to the adapter. take When removing the tooth, insert one end of the rod-shaped tool into the recessed hole and hold it, position the other end to the end of the holding pin inserted into the through hole, hit one end of the main body, A tool for attaching and detaching a tooth of a bucket is provided, wherein the tooth is removed from the adapter by being extracted from the through hole.

Preferably, a pair of the projecting portions are provided on both sides in the extending direction of the main body portion, and each of the pair of projecting portions includes the concave hole at a different position from the main body portion. The concave holes at different positions are formed in different sizes. The main body portion and the protruding portion are integrally formed in a plate shape.

A bucket tooth attaching / detaching tool configured according to the present invention is formed and held on a main body portion that is passed over a pair of teeth, a protrusion portion that extends between a pair of teeth from a substantially middle portion of the main body portion, and a protrusion portion. It has a recessed hole to hold a pin or bar tool.

Therefore, according to the attachment / detachment of the holding pin, the main body holding the holding pin or the rod-shaped tool is passed over the pair of teeth in the recessed hole of the protruding portion, and the position of the holding pin or the rod-shaped tool is moved to the through hole of the tooth and the adapter. In addition, it is possible to easily attach and detach the tooth by hitting one end of the main body with a hammer or the like and attaching or removing the holding pin to or from the through hole. Further, since the size of the tooth attaching / detaching tool is formed to be relatively small so as to be transferred to the pair of teeth, it is easy to handle and store.

Hereinafter, a tooth detaching tool for a bucket constructed according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment.

First, refer to FIG. 3 which is an enlarged cross-sectional view of the attachment state of the adapter 6 and the tooth 4 by the holding pin 8 in the bucket 2 shown in FIG. 4 which is a typical example of the bucket in which the tooth attaching / detaching tool according to the present invention is used. To explain.

The tooth 4 fitted to the adapter 6 and the tip end portion thereof is provided with a through hole K that passes through the adapter 6 along the axis X. A counterbore 7 is formed at one end of the through hole K of the adapter 6, and a ring-shaped retainer 14 is installed. The tooth 4 is attached to the adapter 6 by inserting the holding pin 8 through the retainer 14 and the through hole K in the direction indicated by the arrow Z from the retainer 14 side.

The retainer 14 is formed of spring steel so that the inner diameter is smaller than the outer diameter of the holding pin 8, and a slit that allows the inner diameter to be expanded and contracted is formed in a part of the annular shape. An annular groove 15 is formed in the holding pin 8 at a location corresponding to the position where the retainer 14 is installed in the axis X direction. The holding pin 8 and the retainer 14 are fitted in an interference fit at the groove 15, and the position of the holding pin 8 in the axis X direction is fixed.

With reference to FIG. 1, the tooth attachment / detachment tool indicated by numeral 20 will be described. FIG. 1 is a view showing a combination of a pair of adjacent teeth 4 and an adapter 6 and a tooth attaching / detaching tool 20 in the bucket 2 shown in FIG. 1A shows “when the pin is removed” when a rod-shaped tool 22 described later is attached, and FIG. 1B shows “when the pin is attached” when the holding pin 8 is attached.

The tooth attaching / detaching tool 20 is integrally formed between a pair of teeth 4 and 4 from a substantially middle in a direction in which the main body 20a extends, and a main body 20a that extends straightly between a pair of adjacent teeth 4 and 4. An opening extending in the direction of the axis X at a position corresponding to the axis X of the through hole K of the tooth 4 and the adapter 6 apart from the dimension A away from the protruding portion 20b extending to the tooth 4 of the main body 20a. A concave hole 24 is provided. The recessed hole 24 is formed to have a diameter and depth that can hold one end of the holding pin 8.

A detailed view of the tooth attaching / detaching tool 20 will be described with reference to FIG. 2 in a state in which two types of bar-shaped tools 22 and 26 are attached. The main body portion 20a is provided with the above-described protruding portions 20b and opposing protruding portions 20c on both sides orthogonal to the extending direction. The protrusions 20b and 20c are each provided with a recessed hole at a different distance from the mounting portion on the teeth 4 and 4 of the main body 20a. That is, in contrast to the concave hole 24 of the above-described protruding portion 20b positioned at the dimension A, the protruding portion 20c is formed with a concave hole 28 having a smaller diameter than the concave hole 24 at a position of the dimension B shorter than the dimension A.

The bucket 4 (FIG. 4) equipped in a hydraulic excavator or the like includes a “standard type” and a “reinforced type” as teeth that are normally attached to the adapter 6. The “enhanced type” has larger external dimensions of the tooth, the thickness and length of the holding pin, and the like than the “standard type”. Accordingly, by providing at least two projecting portions 20b and 20c and the recessed holes 24 and 28 having different sizes in this way, one tooth removably attaching tool 20 can attach and detach two different types of teeth. be able to.

The main body 20a and the protrusions 20b and 20c of the tooth attaching / detaching tool 20 are integrally formed by fusing and cutting out a steel sheet having a thickness T in a cross shape. The cross-shaped thick plate may be manufactured by forging or casting. The thickness T is defined as a thickness that can form the large-diameter recessed hole 24.

The rod-shaped tools 22 and 26 are formed of steel in a substantially similar shape like a round pin, and the length, thickness, and the like are defined according to the holding pins having different sizes depending on the type of the tooth. That is, with reference to FIG. 1, the bar-shaped tool 22 has the same overall length as the holding pin 8, the base end portion held in the recessed hole 24 has the same diameter as the holding pin 8, and other parts. Is formed with a diameter smaller than that of the holding pin 8.

Since the rod-shaped tools 22 and 26 are sequentially used a plurality of times when the holding pins that respectively stop the plurality of teeth of the bucket are extracted, the rod-shaped tools 22 and 26 are fixed to the recessed holes 24 and 26 by screws 30 so as not to fall off.

The attachment / detachment of the tooth using the tooth attachment / detachment tool 20 as described above will be described with reference to FIG.

Attaching the tooth (FIG. 1 (b)):
At the time of “tooth attachment”, that is, “pin attachment”, the main body portion 20a in which the holding pin 8 is inserted and held in the concave hole 24 of the protruding portion 20b is passed over the pair of teeth 4 and 4, and the position of the holding pin 8 is changed. Align with the retainer 14 side of the through hole K of the tooth 4 and the adapter 6, hit one end (right side) end of the main body 20a passed in the direction of arrow Z with a hammer or the like, and insert the holding pin 8 into the through hole K Attach and attach the tooth 4 to the adapter 6. The holding pin 8 is tightly fitted by the retainer 14 and its position is fixed. The adjacent teeth 4 are also attached sequentially by the same method.

Removing the tooth (FIG. 1 (a)):
At the time of “tooth removal”, that is, “pin removal”, the main body portion 20a in which the rod-shaped tool 22 is inserted into the recessed hole 24 of the projecting portion 20b and is fixedly held by the screw 30 is passed over the pair of teeth 4 and 4 The position of the rod-shaped tool 22 is aligned with the end on the retainer 14 side of the holding pin 8 inserted through the through hole K of the tooth 4 and the adapter 6, and the end of one side (right side) of the main body portion 20 a that has been passed is indicated by an arrow Hitting in the Z direction, the holding pin 8 is extracted from the through hole K, and the tooth 4 is removed from the adapter 6. By this impact, the interference fit between the holding pin 8 and the retainer 14 is released. The adjacent teeth 4 are also sequentially removed by the same method.

An operation of the bucket tooth attaching / detaching tool 20 as described above will be described.

Tooth detachment:
Since the tooth attaching / detaching tool 20 is formed so as to position the protrusion 20b holding the holding pin 8 or the rod-shaped tool 22 between the adjacent teeth 4 and the teeth 4, the distance between the adjacent teeth 4 and 4 is narrow. In attaching and detaching the tooth, the holding pin can be hit and removed in the direction of the axis X. Therefore, it is possible to solve the problem that the conventional attaching and detaching work by inserting the holding pin 8 obliquely is difficult and the problem that requires extra force.

Holding pin holding:
The tooth attaching / detaching tool 20 has a recessed hole 24 for holding the holding pin 8 or the rod-shaped tool 22. Therefore, it is possible to solve the problem that the conventional holding pin must be held by hand when driven and inserted.

Tool handling and storage:
The tooth attaching / detaching tool 20 is formed in a comparatively small size so that its size is passed to the pair of teeth 4, 4. Therefore, handling and storage at a work site, a user, and the like are easy.

General purpose:
The tooth attaching / detaching tool 20 is provided with two projecting portions 20b and 20c each having a recessed hole for holding a holding pin or a rod-like tool, and each is formed at different positions A and B from the main body portion and in different sizes. Has been. Therefore, it is possible to attach and detach the “standard type” and “strengthening type” teeth of different sizes that are usually prepared in a bucket with a single tooth attaching / detaching tool, and it is necessary to prepare two types of tools. Absent.

compact:
The tooth attaching / detaching tool 20 has a main body portion 20a and projecting portions 20b and 20c which are integrally formed in a plate shape. Therefore, it is compact, can be easily manufactured by fusing a thick steel plate, and can be provided at low cost.

The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various changes or modifications can be made within the scope of the present invention.

For example, in the embodiment of the present invention, the tooth attaching / detaching tool 20 is provided with a pair of protruding portions on both sides of the main body portion. However, when only one type of tooth is attached and detached, the tooth attaching tool 20 may be provided with only one protruding portion. Good.

The figure which showed the tooth | gear removal tool of the bucket comprised according to this invention with the combination of a pair of adjacent tooth | gear of a bucket, and an adapter in the state of use (the figure seen in the CC arrow direction of FIG. 4). 1A shows “when the pin is removed” and FIG. 1B shows “when the pin is attached”. The (a) front view and (b) side view of a tooth detachment tool shown in the state where a rod-shaped tool was attached. The expanded sectional view of the attachment state by the holding pin of an adapter and a tooth (The figure seen in the DD arrow direction of FIG. 4). FIG. 2 is a perspective view of a typical bucket with teeth. An explanatory perspective view of a conventional tooth attaching / detaching method.

Explanation of symbols

2: Bucket 4: Tooth 6: Adapter 8: Holding pin 20: Tooth attaching / detaching tool 20a: Main body portion 20b, 20c: Protruding portion 22, 26: Bar-shaped tool 24, 28: Recessed hole X: Axis

Claims (4)

A tooth is fitted to each of a plurality of adapters protruding adjacent to the bucket, and a holding pin is inserted into and removed from each through-hole that penetrates each of the plurality of adapter and tooth sets substantially along the same axis, and the tooth is attached to and detached from the adapter. A tool to attach and detach the tooth of the bucket to be attached freely,
A straightly extending main body passed over a pair of adjacent teeth;
A protrusion integrally extending between a pair of teeth from substantially the middle of the extending direction of the main body,
A concave hole that extends and opens in the axial direction at a position corresponding to the axial line of the protrusion,
When attaching the tooth, insert one end of the holding pin into the concave hole and hold it, position the other end at the end of the through hole, hit one end of the main body and insert the holding pin into the through hole. To the adapter,
When removing the tooth, insert one end of the rod-shaped tool into the concave hole and hold it, position the other end to the end of the holding pin inserted into the through hole, hit one end of the main body, and insert the holding pin into the through hole Remove the tooth from the adapter by pulling it out of the
A tool for attaching and detaching a tooth of a bucket. A pair of the projecting portions are provided on both sides in the extending direction of the main body,
Each of the pair of protrusions includes the concave hole at a different position from the main body.
The tool for attaching and detaching a tooth of the bucket according to claim 1. The concave holes at different positions are formed in different sizes,
The bucket tooth detaching tool according to claim 2. The main body portion and the protruding portion are integrally formed in a plate shape,
4. The tooth detaching tool for a bucket according to any one of claims 1 to 3.

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