KR101639248B1 - A chisel is equipped with exchange bits - Google Patents

Abstract

The present invention relates to a chisel having a replaceable bit unit and, more specifically, to a chisel which comprises: a main body unit which has a coupling groove having a first screw along the inner circumference at one end; and a bit unit which has a crushing unit formed at the other end and has an end including a coupling protrusion which is combined through a screw in order to be attachable to and detachable from the coupling groove by having a second screw formed to correspond to the first screw along the outer circumference, wherein the second screw has one or more section units formed so that the second screw is cut. The present invention has effects of: easily replacing a damaged bit by forming the bit unit, which can be damaged during a crushing operation, to be attachable to and detachable from the main body unit; and easily separating the bit unit from the main body unit even in continuous hitting operations for the crushing work by having one or more section units in the second screw.

Description

A CHISEL IS EQUIPPED WITH EXCHANGE BITS [0001]

The present invention relates to a chisel having an interchangeable bit unit.

More particularly, the present invention relates to a chisel having a replaceable bit portion for allowing a damaged bit to be easily replaced by detachably attaching a bit portion that may be damaged during a shredding operation to the body portion.

Generally, a chisel is widely used for crushing concrete or rock, etc., and is used to crush concrete or rock in a state of being coupled to a hydraulic breaker, an excavator and a loader.

Therefore, there is a problem that the chisel which directly hits the object is often damaged during the work in order to crush the concrete or the rock.

Accordingly, in the past, in order to replace a damaged chisel, a damaged chisel is separated from a hydraulic breaker, an excavator, a loader, and the like, and then a new chisel is coupled to the work.

As one of the related arts, Japanese Patent No. 10-1062705 discloses a hydraulic breaker in which a chisel can be easily replaced.

1 is a view showing a hydraulic breaker in which a conventional chisel is easily replaced. 1 is a perspective view illustrating a hydraulic breaker according to a first embodiment of the present invention. FIG. 2 is a perspective view of a hydraulic breaker according to a first embodiment of the present invention. Thereby reducing the generated vibration sound.

The hydraulic breaker includes a housing 11, a reciprocating piston 12 provided in the housing 11, and a piston 12 disposed inside the housing 11, A head 14 which is detachably coupled to the body 13 and strikes an object and an elastic member provided between the body 13 and the head 14, The head 14 can be easily replaced and the head 14 can be easily replaced with an elastic material between the body 13 and the head 14. [ By inserting the dissimilar materials 15, it is possible to reduce the vibration sound generated by the impact of the object.

However, since the dissimilar material 15 is not fixed in the state that the dissimilar material 15 is inserted into the body 13, the dissimilar material 15 is prevented from being detached from the body 13 13), thereby causing a safety accident.

The above-mentioned conventional technique is also applied to a case where the head 14 is rotated inside the dissimilar material 15 when the body 13 is rotated to exchange the head 14 in a state where the body 13 is coupled to the inside of the housing 11. [ However, since the dissimilar material 15 may also be rotated inside the body 13, there is a problem in that it is not easy to attach and detach the head 14.

Also, as one of the related arts, a point chisel is disclosed in Patent Publication No. 10-2010-0023994.

2A and 2B are views showing a conventional point chisel. Referring to FIGS. 2A and 2B, when a point is worn according to a shredding operation, only a point is purchased and replaced without purchasing the entire chisel.

The point chisel is classified into a through type and a combined type. The through type point chisel includes a sleeve shank 21 attached to a holder and a through point 22 , And the combined point chisel consists of a general shank 23 attached to the holder and a threaded engagement point 24 screwed to the common shank 23 to replace only the point portion of the chisel So that the cost of replacement of the chisel can be reduced.

However, in the case of the through-hole type, the rear end of the penetration point 22 protrudes to the rear end of the sleeve shank 21, so that it is difficult to stably secure the sleeve shank 21 and the holder. There is a problem that the continuous shots for the operation may break the thread formed in the common shank 23 and the threaded engagement point 24, making detachment difficult.

The above-described prior art is also applicable to a case where a twist occurs between the sleeve shank 21 and the penetration point 22 and between the normal shank 23 and the screw connection point 24 during a crushing operation for crushing concrete or rock. There is a problem that heat can not be solved.

Patent Registration No. 10-1062705 (Aug. 31, 2011) Patent Document 1: Japanese Patent Application Laid-Open No. 10-2010-0023994 (Mar. Patent Registration No. 10-1242869 (Mar. Patent Registration No. 10-1488515 (Jan. 26, 2015)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and a device for detachably fixing a damaged bit, And a replaceable bit unit.

Another problem to be solved by the present invention is to provide a replaceable bit unit capable of easily removing the body portion and the bit portion even in continuous blow for the crushing operation by providing one or a plurality of disconnecting portions formed in the second screw To provide a chisel.

Another problem to be solved by the present invention is to provide a chisel having a replaceable bit portion capable of allowing the oil of the coupling groove to stay in the storage groove portion by providing the storage groove portion facing the inside of the coupling protrusion in the cutting portion I have to.

Another problem to be solved by the present invention is that a first fillet portion is formed around the coupling portion between the coupling protrusion and the bit portion, and the coupling groove and the coupling protrusion are formed to have the same length, so that the body portion and the bit portion are continuously engaged The present invention also provides a chisel having a replaceable bit portion that can prevent a problem of tight fitting of the body portion and the bit portion.

Another problem to be solved by the present invention is to solve the problem of removing the body part and the bit part which can be generated during the operation by the first fitting part formed in the coupling groove of the body part and the second fitting part formed in the coupling protrusion of the bit part And a replaceable bit portion that can prevent the changeable bit portion.

According to an aspect of the present invention, there is provided a chisel provided with a replaceable bit unit, including: a body portion having an engaging groove formed at one end thereof along a circumferential edge thereof to form a first screw; And a bit portion formed at one end with a coupling protrusion having a second screw corresponding to the first screw formed on the outer periphery and detachably screwed to the coupling groove at one end, and a bit portion formed at the other end of the breaking portion.

Further, the second screw may have one or a plurality of cut-away portions formed by cutting the second screw.

Further, in the cut-off portion, one or a plurality of storage grooves facing the inside of the coupling protrusions are formed.

Further, the cutout portion is formed with a moving hole passing through one side and the other side of the engaging projection.

A first fillet portion having a circular arc shape is formed between the bit portion and the coupling protrusion.

A second fillet portion having a radius (r) smaller than a radius (R) of the first fillet portion is formed on the body portion that is in contact with the first fillet portion of the bit portion when the body portion and the bit portion are coupled .

Further, the coupling groove of the body portion is characterized in that a high frequency oil heat treatment is performed.

Further, the coupling groove is formed to have the same length as the coupling projection.

In addition, the body may have one or more discharge holes extending from the outside of the body to the inside of the coupling groove.

In addition, the discharge hole is formed inside the first screw formed in the coupling groove.

According to the chisel having the replaceable bit unit according to an embodiment of the present invention, since the bit unit that can be damaged in the crushing operation is detachably attached to the body unit, the damaged bit can be easily replaced.

In addition, according to the present invention, since the one or more cutouts formed in the second screw are provided, it is possible to easily remove the body portion and the bit portion even in the continuous blow for the crushing operation.

According to the present invention, there is provided an effect that the oil of the coupling groove can stay in the storage groove portion by providing the storage groove portion facing the inside of the coupling projection in the cutting portion.

According to the present invention, since the first fillet portion is formed around the coupling portion between the coupling protrusion and the bit portion, and the coupling groove and the coupling protrusion are formed to have the same length, even if the body portion and the bit portion are continuously engaged, It is possible to prevent the problem of tight attachment.

According to the present invention, since the first and second fitting portions formed in the coupling groove of the body portion and the coupling protrusions of the bit portion can prevent the problem of detaching the body portion and the bit portion, .

In addition, in the prior art, the temperature of the chisel is raised to 300 to 400 DEG C due to the torque generated in the crushing operation, and the strength is weakened. In contrast, in the present invention, the torque generated during the crushing operation is consumed The strength of the bit portion can be improved and the safety accident caused by the high temperature can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a hydraulic breaker in which a conventional chisel is easily replaced; FIG.
2A and 2B show a conventional point chisel.
3 is a view showing a chisel having an interchangeable bit unit according to the present invention;
4 is an exploded view showing a chisel having an interchangeable bit unit according to the present invention;
5 is a view showing a body portion of a chisel having a replaceable bit unit according to the present invention.
6 is a view showing a bit portion of a chisel having a replaceable bit unit according to the present invention;
7A to 7C are diagrams showing an embodiment of an interchangeable bit unit according to the present invention;
8 is a view showing a moving hole of the chisel in which the replaceable bit unit is provided according to the present invention.
9 is a view showing a storage groove portion of a chisel having an interchangeable bit portion according to the present invention.
10 is a view showing a discharge hole of a chisel in which the replaceable bit unit is provided according to the present invention.
11A and 11B are views showing a first fitting portion and a second fitting portion of a chisel having the replaceable bit portion according to the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, And does not preclude the presence or addition of one or more other features, integers, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor should properly interpret the concept of the term to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Further, it is to be understood that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible.

The present invention relates to a chisel having a replaceable bit portion that is detachably attachable to a body portion that can be damaged during a crushing operation so that a damaged bit can be easily replaced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a chisel having a replaceable bit unit according to the present invention will be described in detail with reference to the accompanying drawings.

4 is an exploded view showing a chisel having an interchangeable bit unit according to the present invention, and Fig. 5 is a sectional view of a replaceable bit unit according to the present invention. FIG. 6 is a view showing a bit portion of a chisel having a replaceable bit unit according to the present invention. FIG.

3 to 6, the chisel having the replaceable bit unit of the present invention comprises a body 110 and a bit 120, and is detachably coupled.

The body 110 has an engagement groove 111 formed at one end thereof along which the first screw 112 is formed.

The body 110 may have a hexagonal shape and the body 110 may be coupled to a hydraulic breaker, an excavator, a loader, A portion 115 may be formed.

At this time, the coupling part 115 may be formed in a circular shape, and may be deformed in any way according to the coupling means such as the hydraulic breaker, the excavator, and the loader.

In addition, the coupling groove 111 of the body 110 may be heat-treated with a high-frequency oil. The oil is absorbed into the coupling groove 111 and the oil remains in the coupling groove 111 for a long period of time. Therefore, when the high-frequency oil heat treatment is performed, 120 can easily be screw-rotated in the engaging groove 111.

The bit portion 120 is formed with a second screw 122 corresponding to the first screw 112 along the outer circumference and an engaging projection 121 detachably engaged with the engaging groove 111, And the crushing part 123 is formed at the other end.

At this time, the second screw 122 may have one or a plurality of cut-off portions 122a formed in a state where the second screw 122 is broken. The cut-off portion 122a serves to store the oil remaining in the high-frequency oil heat-treated coupling groove 111 or to reduce the frictional force when the body portion 110 and the bit portion 120 are removed. can do.

The bit unit 120 may be formed by dividing a force transmitted from the body 110 into a crushing part 123 in a state where the coupling protrusion 121 is screwed into the coupling groove 111 of the body part 110. [ To crush the concrete or the rock or the like and crush it.

At this time, the crushing part 123 may be formed in a shape that gradually becomes sharp in one direction, and the end may be formed in a round shape due to the property of crushing and crushing the concrete or rock.

A first fillet portion 126 may be formed between the bit portion 120 and the coupling protrusion 121 so as to have a circular cross section and may be formed between the body portion 110 and the bit portion 120. [ The body portion 110 contacting the first fillet portion 126 of the bit portion 120 at the time of bonding may be provided with a second fillet portion 126 having a radius r smaller than the radius R of the first fillet portion 126, The fillet portion 116 may be formed.

The first fillet part 126 and the second fillet part 116 may prevent the body part 110 and the bit part 120 from being completely joined. That is, by reducing the friction area when the bit unit 120 is detached from the body unit 110 in a state where the body unit 110 and the bit unit 120 are engaged, And the bit portion 120 can be easily removed.

The first screw 112 and the second screw 122 may have the same pitch. More specifically, the first screw 112 and the second screw 122 may be formed with threads having an outer diameter of 12 mm and a pitch of 1.25 mm.

7A to 7C are diagrams showing an embodiment of the replaceable bit unit according to the present invention.

7A shows a state before the concrete part or the rock is crushed in a state where the bit part 120 is screwed to the body part 110 and FIG. 7 (c) shows a state where the bit portion 120 is screwed to the body portion 110, and FIG. 7 (c) shows a state where the bit portion 120 is screwed to the body portion 110, And so on.

7A to 7C, the coupling groove 111 of the present invention may be formed to have the same length as that of the coupling projection 121. The bit portion 120 rotated by the vibration and the torque generated by the chisel of the present invention is inserted into the coupling groove 111 of the body portion 110 by the coupling protrusion 121 of the bit portion 120, The bit portion 120 is detached from the body portion 110 because the coupling protrusion 121 can not be inserted into the coupling recess 111 any more when the concrete or the rock is broken. When the concrete protrusion 121 of the bit unit 120 is crushed in a state that the concrete protrusion 121 of the bit unit 120 is partially detached from the coupling recess 111 of the body 110, The bit portion 120 can be rotated in the direction in which the bit portion 120 is coupled to the body portion 110 by friction with the rock.

When the bit portion 120 rubs against the concrete or the rock to crush the concrete or rock, twisting energy is generated between the body portion 110 and the bit portion 120, The torsion energy is converted into heat and the coupling protrusion 121 is positioned inside the coupling groove 111 so that the heat converted by the torsional energy is not diverted so that the temperature of the chisel is increased to 300-400 ° C., However, in the present invention, the torsional energy may be canceled by the rotation of the bit unit 120. Accordingly, the heat generated in the bit portion 120 and the body portion 110 after the crushing operation of the concrete or the rock is reduced to about 30 to 40 ° C, thereby preventing a safety accident.

When the concrete portion or the rock portion is crushed in a state where the bit portion 120 is initially coupled to the body portion 110, the bit portion 120 is deformed by vibration and torque generated in the chisel of the present invention, (Not shown). At this time, the bit portion 120 should be rotated in the direction of the body portion 110 by friction with the concrete or the rock, but the length of the coupling groove 111 formed in the body portion 110 may be longer than the length of the bit portion 120. [ Since the body 120 is formed to have a length equal to the length of the engaging projection 121 of the body 120, the body 120 is no longer rotated in the direction of the body 110, and the rotating force is repelled in the concrete or rock direction.

That is, when the concrete part or the rock part is crushed in a state where the bit part 120 and the body part 110 are combined, the bit part 120 can be rotated in the concrete or rock direction, 120 may be rotated in the concrete or rock direction to partially fracture the concrete or rock, the bit portion 120 may be rotated in the direction of the body 110, The crushing part 123 formed on the bit part 120 can add the rotational force to crush the concrete or rock.

In the present invention, only the bit portion 120 is rotated once in a direction in which the bit portion 120 is detached from the body portion 110, and the bit portion 120 is rotated once in a direction in which the bit portion 120 is coupled to the body portion 110 The bit part 120 of the present invention which can be detached and coupled to the body part 110 may include repeating the process of being continuously detached and coupled while using the chisel of the present invention .

8 is a view showing a moving hole of a chisel provided with a replaceable bit unit according to the present invention.

According to the attached FIG. 8, a cutout 122a formed in the bit 120 of the present invention may be formed with a moving hole 125 passing through one side and the other side of the coupling protrusion 121.

The moving hole 125 is formed in a position where the oil remaining in the coupling groove 111 of the body portion 110 subjected to the high frequency oil heat treatment flows from one side of the coupling projection 121 to the other side, So that it can be moved from one side to the other side.

At this time, the moving hole 125 may be formed in a '+' shape as well as a 'I' shape passing through one side of the coupling protrusion 121, but also a plurality of moving holes 125 have.

9 is a view showing a storage groove portion of a chisel having a replaceable bit portion according to the present invention.

9, one or more storage groove portions 124 may be formed in the cutout portion 122a formed in the bit portion 120 of the present invention, the storage groove portions 124 facing the inside of the coupling protrusions 121. Referring to FIG.

The storage groove portion 124 allows the oil remaining in the coupling groove 111 of the body portion 110 subjected to the high frequency oil heat treatment to be stored for a short period of time. 121 and the second screw 122 formed on the second screw 121. The oil stored in the storage groove part 124 for a short period of time may flow through the second screw 122 according to the rotation of the bit part 120, And is bi-directionally rotated in a direction to be coupled to the body portion 110. [

The storage groove 124 may be inclined in a direction in which the bit 120 is loosened from the body 110 and a direction in which the bit 120 is coupled to the body 110 . That is, the storage groove 124 may be formed to be inclined clockwise or counterclockwise, or may be formed to face the center of the coupling protrusion 121.

10 is a view showing a discharge hole of a chisel having a replaceable bit unit according to the present invention.

Referring to FIG. 10, one or more discharge holes 113 may be formed in the body 110 of the present invention to penetrate from the outside of the body 110 to the inside of the coupling groove 111 .

At this time, the discharge hole 113 may be formed on the first screw 112 formed in the coupling groove 111. That is, the discharge hole 113 is formed at the deepest position of the coupling groove 111, so that the discharge hole 113 is moved into the coupling groove 111 by the coupling protrusion 121 coupled to the coupling groove 111 And the heat generated between the body portion 110 and the bit portion 120 may be released together with the heat generated during the crushing operation.

In addition, the diameter of the discharge hole 113 may be 0.1 mm to 1 mm, and the diameter of the discharge hole 113 may be such that foreign matter may not flow through the discharge hole 113.

11A and 11B are views showing the first and second fitting portions of the chisel having the replaceable bit portion according to the present invention.

11A and 11B, the body 110 of the present invention is formed on the upper portion of the first screw 112 formed in the coupling groove 111 and has a smaller diameter than the first screw 112 The bit portion 120 of the present invention may be formed on the second screw 122 formed on the coupling protrusion 121 and may include the first fitting portion 114, And a second fitting portion 127 having a corresponding diameter.

The first and second fitting portions 114 and 127 may be formed of a material having elasticity so as to prevent the body portion 110 and the bit portion 120 from being completely removed during the operation. .

The second screw 122 and the second fitting part 127 may be spaced apart from each other. For example, when the bit unit 120 is coupled to the body 110, the bit unit 120 is rotated in a direction in which the bit unit 120 is detached from the body 110. At this time, The first and second fitting portions 114 and 127 define the number of turns of the bit portion 120 by a distance between the second screw 122 and the second fitting portion 127 .

When the bit unit 120 is to be completely detached from the body 110, the bit unit 120 is rotated in the detaching direction from the body 110, The bit portion 120 and the body portion 110 can be detached from the first and second fitting portions 127 and 127, respectively.

As described above, according to the present invention, since the bit portion, which may be damaged during the crushing operation, is detachably attachable to the body portion, the damaged bit can be easily replaced and the one or more cutting portions formed in the second screw are provided, The body portion and the bit portion can be easily removed even when the body is continuously hit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It can be seen that branch substitution, modification and modification are possible.

110: body portion 111: engaging groove
112: first screw 113: discharge hole
114: First fitting part 115: Coupling part
116: second fillet portion
120: bit portion 121: engaging projection
122: second screw 122a:
123: crushing section 124: storage groove
125: moving hole 126: first fillet portion
127: second fitting portion

Claims (10)

A body portion 110 formed at one end with a coupling groove 111 in which a first screw 112 is formed along an inner periphery; And
A second screw 122 corresponding to the first screw 112 is formed along an outer periphery of the first screw 112 and a coupling protrusion 121 detachably engaged with the coupling groove 111 is formed at one end, 123) is formed at the other end;
Lt; / RTI >
In the second screw 122,
One or a plurality of cut-off portions 122a formed by cutting off the second screws 122 are formed,
In the cut-off portion 122a,
And a moving hole (125) passing through one side and the other side of the coupling protrusion (121) is formed.
delete delete delete The method according to claim 1,
Between the bit portion 120 and the coupling protrusion 121,
And a first fillet portion (126) having an arc shape in cross section is formed.
The method of claim 5,
The body portion 110 which is in contact with the first fillet portion 126 of the bit portion 120 when the body portion 110 and the bit portion 120 are coupled,
Wherein a second fillet portion (116) having a radius (r) smaller than a radius (R) of the first fillet portion (126) is formed.
The method according to claim 1,
In the coupling groove 111 of the body 110,
And a high-frequency oil heat treatment is performed.
The method of claim 5,
The engaging groove 111 is formed in a substantially U-
Wherein the coupling protrusion (121) is formed to have the same length as the coupling protrusion (121).
The method according to claim 1,
In the body 110,
Wherein one or a plurality of discharge holes (113) penetrating from the outside of the body part (110) to the inside of the coupling groove (111) are provided.
The method of claim 9,
The discharge hole (113)
And the first screw (112) formed in the coupling groove (111) is formed inside the first screw (112).

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