KR102485576B1 - Keyless drill chuck - Google Patents

Abstract

The present invention, the body portion is installed in the machine tool, the shaft hole is formed along the longitudinal direction; a bolt portion screwed into the shaft hole of the body portion; a split cap fixed to the body portion by the bolt portion; A jaw including a plurality of jaws for fixing a tool; And it relates to a keyless drill chuck comprising a fixed cap screwed to the outer surface of the split cap, for applying an external force to the jaw.
According to the present invention, since it is possible to install and replace tools without a key handle, working time can be shortened and work efficiency can be improved.
In addition, according to the present invention, since the configuration is simple, there is an effect that durability can be improved and production cost can be reduced.
In addition, according to the present invention, since the configuration is simple, there is an effect of facilitating maintenance.

Description

Keyless drill chuck {KEYLESS DRILL CHUCK}

The present invention relates to a keyless drill chuck, and more particularly, to a keyless drill chuck having a simple configuration and enabling installation and replacement of tools without a key handle.

A drill refers to a machine tool that fixes a tool to a shaft rotated by an electric motor and forms a hole in a workpiece while rotating the tool.

A drill chuck for holding a tool is installed in such a drill.

Three or more jaws are disposed inside the drill chuck, and as these jaws are evenly tightened, a tool drawn between each jaw can be fixed.

On the other hand, the drill chuck can be divided into a general drill chuck for mounting a tool by rotating the outer circumference of the chuck using a key handle, and a keyless drill chuck for mounting a tool by a user directly rotating the outer circumference of the chuck.

The keyless drill chuck is a trend that is widely used because it can easily mount and replace tools without a key handle.

However, the conventional drill chuck has a problem in that it is composed of a large number of parts, has low durability and high production cost.

In addition, since the configuration and structure are complicated, there is a problem that maintenance is difficult when parts are replaced or damaged.

The background technology of the present invention is disclosed in Republic of Korea Utility Model Registration No. 20-0446122.

An object of the present invention has been created to solve the above-mentioned problems, to provide a keyless drill chuck that enables installation and replacement of tools without a key handle, and is simple in configuration and easy to maintain.

The present invention, the body portion is installed in the machine tool, the shaft hole is formed along the longitudinal direction; a bolt portion screwed into the shaft hole of the body portion; a split cap fixed to the body portion by the bolt portion; A jaw including a plurality of jaws for fixing a tool; and a fixed cap screwed to an outer surface of the split cap to apply an external force to the jaw.

The body portion may be threaded with the bolt portion by forming a screw bone in the shaft hole.

In the split cap, a coupling groove in which each set of the jaws can be disposed is formed, and each set can be inserted into the coupling groove and moved toward the center of the split cap.

In the set, the distance of each set may be uniformly adjusted according to the direction of rotation of the fixing cap.

An escape groove for preventing abrasion of the split cap may be formed in the jaw part along the longitudinal direction of the jaw part.

According to the present invention, since it is possible to install and replace tools without a key handle, working time can be shortened and work efficiency can be improved.

In addition, according to the present invention, since the configuration is simple, there is an effect that durability can be improved and production cost can be reduced.

In addition, according to the present invention, since the configuration is simple, there is an effect of facilitating maintenance.

1 is a perspective cross-sectional view of a keyless drill chuck according to an embodiment of the present invention;
Figure 2 is an exploded view of the keyless drill chuck of Figure 1,
3 is a cross-sectional view of the keyless drill chuck of FIG. 1;
4 is a partial cross-sectional view of the keyless drill chuck of FIG. 1;
5 is a partial cross-sectional view showing the movement of the fixing cap and jaw of the keyless drill chuck of FIG. 1;
6 is a perspective view showing the coupling position of the bolt part and the jaw part of the keyless drill chuck of FIG. 1;
7 is a cross-sectional view of a jaw of the keyless drill chuck of FIG. 1;

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings.

And, in describing the embodiments of the present invention, if it is determined that a detailed description of a related known configuration or performance hinders understanding of the embodiments of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term.

Referring to FIGS. 1 to 7 , the keyless drill chuck 100 includes a body part 110, a bolt part 120, a split cap 130, a jaw part 140, and a fixing cap 150.

A shaft hole (I) may be formed in the body portion 110 along the longitudinal direction of the body portion 110 .

The main shaft of the machine tool is coupled to one side of the shaft hole (I), and the bolt part 120 is screwed to the other side of the shaft hole (I).

A screw bone may be formed on the other side of the shaft hole (I) of the body part 110 .

The body part 110 may rotate in the same direction as the main shaft of the machine tool rotates.

The body portion 110 may be made of various alloys such as stainless steel, brass, and titanium so as not to be damaged by strong rotation and external impact.

The bolt part 120 is screwed into the shaft hole I of the body part 110 .

The bolt part 120 may include a bolt body 121 and a bolt head 122.

A screw thread corresponding to the screw bone of the body portion 110 may be formed on an outer circumferential surface of the bolt body 121 .

The bolt body 121 may be fixed to the body part 110 by being screwed into a screw bone of the body part 110 .

The bolt head 122 is installed at one end of the bolt body 121 and can guide the movement of the jaw part 140 .

A plurality of 'T' shaped grooves 1221 may be formed in the bolt head 122 .

The plurality of grooves 1221 may be formed from an outer direction of the bolt head 122 toward a center of the bolt head 122 .

That is, the plurality of grooves 1221 may be formed in a direction perpendicular to the axis of the bolt body 121 .

For example, the plurality of grooves 1221 may include a first groove 1221a, a second groove 1221b, and a third groove 1221c formed in the bolt head 122.

In addition, the jaw parts 140 may be disposed in the first groove 1221a, the second groove 1221b, and the third groove 1221c to slide.

More specifically, when the external force is applied to the jaw part 140, the jaw part 140 slides along the formation direction of the first groove 1221a, the second groove 1221b, and the third groove 1221c. While approaching the tool, it is possible to fix the tool.

That is, the plurality of grooves 1221 of the bolt head 122 can provide a space into which the jaw 140 can be inserted and guide the movement of the jaw 140 .

Meanwhile, the bolt part 120 is fixed to the body part 110 in a state of being inserted into the split cap 130, thereby fixing the split cap 130 to the body part 110.

The split cap 130 guides the position of the jaw part 140 and may be fixed to the body part 110 .

That is, in the present invention, when the jaw part 140 is pressed by the fixing cap 150, the movement can be guided by the bolt head 122 and the split cap 130.

More specifically, an insertion space into which the bolt part 120 can be inserted may be formed inside the split cap 130 .

The bolt head 122 of the bolt part 120 is disposed in the insertion space of the split cap 130, and the bolt body 121 of the bolt part 120 is disposed in the shaft hole I of the body part 110. ) can be introduced.

That is, as the bolt part 120 inserted into the split cap 130 is screwed to the body part 110 , the split cap 130 may be fixed to the body part 110 .

On the other hand, it is preferable that the screwing direction of the bolt part 120 and the body part 110 is the same as the direction of rotation of the main shaft.

When the screwing direction of the bolt part 120 and the body part 110 is opposite to the direction of rotation of the main shaft, the rotational force and vibration of the main shaft cause a gap between the bolt part 120 and the body part 110. This is because the screw connection may become loose.

A plurality of coupling grooves 131 in which the jaws 140 can be disposed may be formed in the split cap 130 .

The plurality of coupling grooves 131 may be formed spaced apart at equal intervals.

For example, the plurality of coupling grooves 131 may be formed at positions where the cross-sectional circumference of the split cap 130 is divided into thirds.

The plurality of coupling grooves 131 may be made in a number corresponding to the number of the jaws 140 so that the jaws 140 can be disposed respectively.

For example, a first coupling groove, a second coupling groove, and a third coupling groove may be formed in the split cap 130 .

Also, a screw thread may be formed on an outer circumferential surface of the split cap 130 .

The jaw part 140 fixes the tool and may include a plurality of jaws. For example, the grandfather 140 may include Article 1 (Jaw, 141), Article 2 (Jaw, 142), and Article 3 (Jaw, 143).

The jaw part 140 may be circularly arranged such that the first jaw 141, the second jaw 142, and the third jaw 143 have the same distance.

In more detail, the jaw part 140 may be disposed along the outer circumferential surface of the split cap 130 . At this time, the first article 141, the second article 142, and the third article 143 are inserted into the respective coupling grooves 131 and arranged at regular intervals along the outer circumferential surface of the split cap 130. Can be arranged circularly.

For example, the first set 141 is inserted into the first coupling groove, the second set 142 is inserted into the second coupling groove, and the third set 143 is inserted into the third coupling groove. can be brought in.

According to the arrangement of the jaws 140, the distance of each jaw can be maintained constant.

In addition, according to the arrangement of the jaw part 140, a mounting space in which the tool can be mounted may be formed between the respective jaws.

When the tool is inserted into the mounting space, the jaw part 140 is moved in the direction of the outer circumferential surface of the tool and applies an external force to the tool to fix the tool.

The distance between each jaw may be uniformly adjusted according to the rotation direction of the fixing cap 150 to be described later.

In more detail, each jaw may include a base 1401, a hooking part 1402, and a coupling part 1403.

The base 1401 may be inserted into the coupling groove 131 and may be disposed to pass through the split cap 130 .

The base 1401 may be made in a right-triangular shape and may be made in a shape that becomes narrower toward the inside (downward direction in FIG. 7).

The inner side of the base 1401 is a portion inserted into the split cap 130, and a flat contact surface may be formed to apply an external force to the tool by contacting the outer circumferential surface of the tool.

That is, as shown in FIG. 7 , the base 1401 may be made in the shape of a right triangular plate, the width of which becomes narrower toward the inside, and the contact surface of the flat shape may be formed.

According to the shape of the base 1401, a strong external force can be applied to the outer circumferential surface of the tool.

That is, the tool can be fixed more firmly.

Escape grooves l401a may be formed on both side surfaces of the base 1401 along the longitudinal direction of the base 1401 .

The escape groove 1401a may form an escape space between the base 1401 and the split cap 130 .

More specifically, while the fixing cap 150 is rotated, the jaw part 140 and the split cap 130 are pressed, and at this time, each tip of the split cap 130 forming each coupling groove 131 (Edges) may come into contact with both sides of the base 1401 while being pushed to both sides of the base 1401 .

According to this, each tip forming each coupling groove 131 may be worn or damaged due to contact and friction with the base 1401 .

However, according to the escape groove 1401a, even if each tip forming each coupling groove 131 is pressed by the fixing cap 150, it can be pushed and moved into the escape groove 1401a, so that the base 1401 ) can be prevented from contacting both sides of the

According to this, since the plurality of coupling grooves 131 of the split cap 130 can be prevented from being worn or damaged, the useful life of the split cap 130 and the claw 140 can be extended.

The hanging part 1402 is installed on the outer surface of the base 1401.

The hooking part 1402 may be formed wider than the width of the base 1401 and may be made to have a curved outer surface.

At this time, the curved shape of the outer surface may be made to correspond to the curved shape of the inner surface of the fixing cap 150.

An outer surface of the hooking part 1402 may come into contact with an inner surface of the fixing cap 150 .

The hooking part 1402 may move the base 1401 toward the inside of the split cap 130 when an external force is applied from the fixing cap 150 .

After the hooking part 1402 is moved for a certain distance, the movement may be restricted by interfering with the outer surface of the split cap 130 .

That is, the hanging part 1402 can adjust the moving distance of the base 1401 .

The coupling part 1403 is disposed on the bolt head 122 and can be moved.

In more detail, the coupling part 1403 may be formed to extend from the inclined surface of the base 1401 and be made in an 'a' shape bent in one direction.

The coupling part 1403 may slide in each groove 1221 of the bolt head 122 when an external force is applied from the fixing cap 150 .

For example, the coupling part 1403 of the first set 141 slides inward in the first groove 1221a, and the coupling part 1403 of the second set 142 slides in the first groove 1221a. It slides inward in the second groove 1221b, and the coupling part 1403 of the third row 143 can slide inward in the third groove 1221c.

That is, each groove 1221 of the bolt head 122 can provide a space in which the jaw 140 can slide and guide the movement of the jaw 140 .

Meanwhile, when the coupling part 1403 is inserted into each groove 1221 of the bolt head 122, a space in which lubricant can be applied can be formed between the coupling part 1403 and each groove 1221. there is.

More specifically, since each of the grooves 1221 is made in a 'T' shape and the coupling part 1403 is made in an 'L' shape, the coupling part 1403 is drawn into each of the grooves 1221. Then, a space can be formed due to the difference in shape.

According to this, the lubricating oil reduces the frictional force between the jaw part 140 and the bolt part 120, so that the jaw part 140 can slide more smoothly.

The fixing cap 150 applies an external force to the jaw part 140 and may be combined with the split cap 130 .

The fixing cap 150 may have a coupling space formed therein and openings formed at both ends thereof.

A screw bone corresponding to a screw thread formed on an outer circumferential surface of the split cap 130 may be formed on an inner surface of the fixing cap 150 .

One end of the fixing cap 150 may be screwed to the outer surface of the split cap 130 .

When the fixing cap 150 is coupled to the split cap 130, the inner surface of the fixing cap 150 may come into contact with the jaw part 140.

On the other hand, the coupling space of the fixing cap 150 may be made such that its diameter becomes narrower toward the other end.

According to the shape of the fixing cap 150, an external force may be applied to the jaw part 140 according to the direction of rotation of the fixing cap 150.

For example, when a user rotates the fixing cap 150 in a left direction, the fixing cap 150 may move toward the body part 110 .

At this time, the fixing cap 150 may apply an external force to the jaw part 140 by the shape of the fixing cap 150 .

According to this, the distances between the first set 141, the second set 142, and the third set 143 may become closer.

Conversely, when the user rotates the fixing cap 150 in the right direction, the fixing cap 150 may move in the opposite direction of the body part 110 .

At this time, since the inner surface of the wide diameter of the fixing cap 150 is in contact with the jaw part 140, the magnitude of the external force applied to the jaw part 140 by the fixing cap 150 can be reduced. That is, the distance between the first set 141, the second set 142, and the third set 143 may be increased.

The fixing cap 150 can detach the tool from the jaw part 140 according to the direction of rotation.

From now on, the operation of the keyless drill chuck will be described in detail with reference to FIGS. 4 and 5 .

Referring to FIG. 4 , the fixing cap 150 may be rotated by a worker and moved toward the body part 110 .

At this time, the inner surface of the fixing cap 150 may be in contact with the jaw part 140 to apply an external force to the jaw part 140 .

In more detail, the inner surface of the fixing cap 150 is formed to narrow in the other direction.

Accordingly, when the fixing cap 150 is moved toward the body part 110, the jaw part 140 receives an external force due to the shape of the fixing cap 150.

Each of the jaws receiving an external force from the fixing cap 150 may be moved closer to each other.

That is, each jaw can be uniformly moved toward the center of the cross-sectional circumference of the split cap 130 .

At this time, each jaw may slide in each groove 1221 of the bolt head 122 in a direction perpendicular to the bolt part 120 .

According to this operation, the jaw part 140 can provide force in a certain direction to the outer circumferential surface of the tool inserted into the jaw part 140 .

According to this, the tool can be firmly mounted and fixed between the jaws 140 .

At this time, the coupling part 1403 of each jaw is disposed in each groove 1221 of the bolt head 122 and slides, and the base 1401 of each jaw is the split cap ( 130) can be inserted into each coupling groove 131 and moved.

Referring to FIG. 5 , the fixing cap 150 may be rotated by an operator and moved in the opposite direction of the body part 110 .

At this time, the jaw part 140 may be in contact with a coupling space having a wide diameter according to the inner shape of the fixing cap 150.

According to this, while the external force applied to the jaw part 140 is reduced, each jaw can be moved away from each other.

That is, each jaw can be uniformly moved away from the center of the circumference of the cross section of the split cap 130 .

According to this operation, since the external force applied to the tool mounted on the jaw part 140 is removed, the tool can be removed from the jaw part 140 .

According to the operation of the keyless drill chuck of FIGS. 4 and 5, the tool can be easily attached and detached by rotating the split cap 130.

According to the above-described keyless drill chuck including the body part 110, the bolt part 120, the split cap 130, the jaw part 140, and the fixing cap 150, the production cost is low because the configuration is simple. It has the effect of increasing durability. In addition, there is an effect that maintenance is easy and tools can be easily replaced without a key.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate.

In addition, terms such as "include", "comprise" or "have" described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

In addition, the above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: Keyless drill chuck according to an embodiment of the present invention.
110: body part
120: bolt part
130: split cap
140: grandfather
150: fixed cap

Claims (5)

A body portion installed on a machine tool and having a shaft hole formed along the longitudinal direction;
a bolt portion screwed into the shaft hole of the body portion;
a split cap fixed to the body portion by the bolt portion;
A jaw including a plurality of jaws for fixing a tool; and
A fixed cap screwed to the outer surface of the split cap to apply an external force to the jaw,
In the split cap,
A plurality of coupling grooves are formed spaced apart at equal intervals so that each pair of the jaws can be drawn in and disposed,
The bolt part,
A bolt body screwed into the shaft hole of the body portion and a bolt head for guiding the movement of the jaw portion,
The bolt head,
A plurality of T-grooves having a “T”-shaped cross section are formed to guide the movement of each pair,
Each of the above,
A base inserted into the coupling groove and disposed to pass through the split cap;
A hooking portion formed wider than the width of the base and formed such that an outer surface is curved and caught on both edges of the split cap forming the coupling groove;
The cross section is formed in an "L" shape and includes a coupling portion that is inserted into the T-groove of the bolt head and slid,
The T groove,
When the coupling part is inserted, a space into which lubricating oil can be introduced is formed,
The base is
A flat contact surface is formed at the end,
In the base,
A keyless drill chuck, characterized in that a pair of escape grooves are formed along the longitudinal direction of the base to prevent abrasion of both edges of the split cap forming the coupling groove at the boundary with the engaging portion.
The method of claim 1,
The body part,
A keyless drill chuck, characterized in that a screw bone is formed in the shaft hole to be screwed with the bolt portion.
delete The method of claim 1,
said grandfather,
A keyless drill chuck, characterized in that the distance of each pair is uniformly adjusted according to the rotation direction of the fixing cap.
delete

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