KR20220086022A - Keyless drill chuck - Google Patents

Abstract

The present invention is installed in a machine tool, the body portion is formed with a shaft hole along the longitudinal direction; a bolt part screwed to the shaft hole of the body part; a split cap fixed to the body part by the bolt part; A jaw including a plurality of jaws (Jaw) for fixing the tool; and a fixing cap screwed to the outer surface of the split cap to apply an external force to the jaw.
According to the present invention, since it is possible to mount and replace the tool without a key handle, the working time can be shortened, and the working efficiency can be improved.
In addition, according to the present invention, since the configuration is simple, there is an effect that durability is improved and the production cost can be reduced.
In addition, according to the present invention, since the configuration is simple, there is an effect that maintenance becomes easy.

Description

Keyless drill chuck {KEYLESS DRILL CHUCK}

The present invention relates to a keyless drill chuck, and more particularly, to a keyless drill chuck in which a tool can be mounted and replaced without a key handle and has a simple configuration.

The drill refers to a machine tool that forms a hole in a work piece while fixing the tool on a rotating shaft by an electric motor and rotating it.

A drill chuck for fixing the tool is installed in such a drill.

Three or more jaws are arranged inside the drill chuck, and by tightening these jaws evenly, the tool inserted between each jaw can be fixed.

Meanwhile, the drill chuck may be divided into a general drill chuck in which a tool is mounted by rotating the outer periphery of the chuck by using a key handle, and a keyless drill chuck in which a user directly rotates the outer periphery of the chuck to mount a tool.

The keyless drill chuck is widely used because it can be easily installed and replaced without a key handle.

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

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

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

SUMMARY OF THE INVENTION An object of the present invention is to provide a keyless drill chuck, which has been created to solve the above-described problems, can be installed and replaced without a key handle, and has a simple configuration and is easy to maintain.

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

The body part may be screw-coupled to the bolt part by forming a screw trough in the shaft hole.

A coupling groove in which each set of the jaws can be arranged is formed in the split cap, and each group is introduced into the coupling groove to move in a central direction of the split cap.

The jaws may have a uniform distance between each jaw according to the rotation direction of the fixing cap.

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

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

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

In addition, according to the present invention, since the configuration is simple, there is an effect that maintenance becomes easy.

1 is a perspective cross-sectional view of a keyless drill chuck according to an embodiment of the present invention;
2 is an exploded view of the keyless drill chuck of FIG. 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 jaws 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;
FIG. 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 with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings.

In the description of the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or performance interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.

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 part 110 in the longitudinal direction of the body part 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 valley may be formed on the other side of the shaft hole I of the body part 110 .

The body part 110 may be rotated in the same direction when the main shaft of the machine tool rotates.

The body part 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 to 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 trough of the body part 110 may be formed on the outer peripheral surface of the bolt body 121 .

The bolt body 121 may be screwed to the screw trough of the body part 110 to be fixed to the body part 110 .

The bolt head 122 may be installed at one end of the bolt body 121 and guide the movement of the jaw portion 140 .

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

The plurality of grooves 1221 may be made from the outer direction of the bolt head 122 to the center direction 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 jaws 140 may be respectively disposed in the first groove 1221a, the second groove 1221b, and the third groove 1221c to be slid.

In more detail, when the jaw unit 140 receives an external force, the jaw unit 140 slides along the formation direction of the first groove 1221a, the second groove 1221b, and the third groove 1221c. It is possible to access the tool and fix the tool.

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

Meanwhile, the bolt part 120 may be fixed to the body part 110 while 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 may be guided by the bolt head 122 and the split cap 130 .

In more detail, 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 located in the shaft hole I of the body part 110 . ) can be introduced.

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

On the other hand, the screw coupling direction between the bolt part 120 and the body part 110 is preferably the same as the rotation direction of the main shaft.

When the screw coupling direction of the bolt part 120 and the body part 110 is opposite to the rotation direction of the main shaft, between the bolt part 120 and the body part 110 by the rotational force and vibration of the main shaft. This is because the screw connection of the

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 to be spaced apart at the same interval.

For example, the plurality of coupling grooves 131 may be respectively formed at positions obtained by dividing the cross-sectional circumference of the dividing cap 130 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 respectively disposed.

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

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

The jaw unit 140 is for fixing the tool, and may be formed of a plurality of jaws. For example, the jaw unit 140 may include Article 1 (Jaw, 141), Article 2 (Jaw, 142), and Article 3 (Jaw, 143).

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

In more detail, the jaws 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 dividing cap 130 . It can be arranged in a circle.

For example, the first set 141 is introduced into the first coupling groove, the second set 142 is introduced 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 between the jaws may be constantly maintained.

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

When the tool is inserted into the mounting space, the jaw part 140 is moved in the direction of the outer peripheral surface of the tool to apply an external force to the tool, thereby fixing the tool.

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

In more detail, each of the jaws (Jaw) may include a base 1401 , a locking part 1402 , and a coupling part 1403 .

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

The base 1401 may be made in a right triangle shape and may be made in a shape that becomes narrower toward the inner direction (lower direction in FIG. 7 ).

The inner side of the base 1401 is a portion that is introduced into the split cap 130, and a planar contact surface may be formed so as to be in contact with the outer circumferential surface of the tool to apply an external force to the tool.

That is, as shown in FIG. 7 , the base 1401 may be made in the shape of a right-triangular plate, and the width may become narrower in the inward direction, and the contact surface of the flat shape may be formed.

According to the shape of the base 1401, it is possible to provide a strong external force to the outer peripheral surface of the tool.

That is, the tool can be more firmly fixed.

Escape grooves 1401a may be formed on both sides of the base 1401 in 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 .

In more detail, the fixed cap 150 is rotated to press the jaw part 140 and the split cap 130 , at this time, each tip forming the respective coupling grooves 131 of the split cap 130 . (edges) may be in contact with both sides of the base 1401 while being pushed to both sides of the base 1401 .

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

However, according to the escape groove 1401a, even if the respective ends forming the respective coupling grooves 131 are pressed by the fixing cap 150, they can be pushed and moved into the escape groove 1401a, so that the base 1401 ) can be prevented from coming into contact with both sides.

Accordingly, since the plurality of coupling grooves 131 of the split cap 130 can be prevented from being worn or damaged, the service life of the split cap 130 and the jaws 140 can be extended.

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

The locking part 1402 may be formed to be wider than the width of the base 1401 , and an outer surface thereof may be curved.

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 .

The outer surface of the locking part 1402 may be in contact with the inner surface of the fixing cap 150 .

When receiving an external force from the fixing cap 150 , the locking part 1402 may move the base 1401 in the inner direction of the split cap 130 .

After the locking part 1402 is moved for a certain distance, it may interfere with the outer surface of the split cap 130 to limit movement.

That is, the locking 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 portion 1403 may be formed to extend from the inclined surface of the base 1401 and be made in a 'L' shape that is bent in one direction.

When receiving an external force from the fixing cap 150 , the coupling part 1403 may slide in each of the grooves 1221 of the bolt head 122 .

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 is the first The second groove 1221b slides inwardly, and the coupling portion 1403 of the third set 143 may slide inwardly in the third groove 1221c.

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

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

In more detail, since each of the grooves 1221 is made in a 'T' shape, and the coupling part 1403 is made in a 'L' shape, the coupling part 1403 is introduced into each of the grooves 1221 . In this case, a space may be formed due to the difference in shape.

Accordingly, the lubricating oil reduces the frictional force between the jaws 140 and the bolts 120 so that the jaws 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 may be formed at both ends.

On the inner surface of the fixing cap 150 , a screw trough corresponding to the screw thread formed on the outer circumferential surface of the split cap 130 may be formed.

One end of the fixing cap 150 may be screw-coupled 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 be in contact with the jaw unit 140 .

Meanwhile, the coupling space of the fixing cap 150 may be made to have a narrower diameter as it goes toward the other end.

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

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

In this case, the fixing cap 150 may apply an external force to the jaw unit 140 according to the shape of the fixing cap 150 .

Accordingly, the distance between the first article 141 and the second article 142 and the third article 143 may be close.

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

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

The fixing cap 150 may detach the tool from the jaw unit 140 according to the rotation direction.

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 an operator and moved toward the body 110 .

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

More specifically, the inner surface of the fixing cap 150 is formed to narrow in the other side direction.

Accordingly, when the fixing cap 150 is moved toward the body part 110 , the jaw part 140 is provided with an external force by the shape of the fixing cap 150 .

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

That is, each jaw may be uniformly moved in the direction of the center of the cross-sectional circumference of the split cap 130 .

In this case, each jaw may be slid in each groove 1221 of the bolt head 122 in a direction perpendicular to the bolt part 120 .

According to this operation, the jaw unit 140 may provide a force in a certain direction to the outer peripheral surface of the tool inserted into the jaw unit 140 .

Accordingly, the tool may 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 slid, and the base 1401 of each jaw is the split cap ( It can be moved by being inserted into each coupling groove 131 of 130).

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

Accordingly, as the external force applied to the jaws 140 decreases, the jaws may be moved away from each other.

That is, each jaw may be uniformly moved away from the center of the cross-sectional circumference of the split cap 130 .

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

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

According to the 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 construction is simple, so the production cost is low. and has the effect of increasing durability. In addition, there is an effect that maintenance is easy and the tool can be simply replaced without a key.

In the above, even though it has been described that all the components constituting the embodiment of the present invention operate by being combined or combined into one, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more.

In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be inherent, unless otherwise specified, excluding other components. Rather, it should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be construed as being consistent with the contextual meaning of the related art, and should not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

And, the above description is merely illustrative of the technical idea of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

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

100: a 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)

The body portion is installed on the machine tool, the shaft hole is formed along the longitudinal direction;
a bolt part screwed to the shaft hole of the body part;
a split cap fixed to the body part by the bolt part;
A jaw including a plurality of jaws (Jaw) for fixing the tool; and
A keyless drill chuck comprising a fixing cap screwed to the outer surface of the split cap and applying an external force to the jaw.
The method according to claim 1,
The body part,
A keyless drill chuck, characterized in that a screw valley is formed in the shaft hole to be screwed with the bolt part.
The method according to claim 1,
In the split cap,
A coupling groove in which each pair of the jaws can be arranged is formed,
In the coupling groove,
The keyless drill chuck, characterized in that each jaw is retracted and moved toward the center of the split cap.
4. The method according to claim 3,
the grandfather,
A keyless drill chuck, characterized in that the distance of each set is uniformly adjusted according to the rotational direction of the fixing cap.
The method according to claim 1,
In the grandfather,
A keyless drill chuck, characterized in that an escape groove for preventing wear of the split cap is formed along the longitudinal direction of the jaw.

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