KR101759303B1 - Clamp device of electrically-drive tool and electrically-drive tool including the same - Google Patents

Abstract

A chuck unit including a chuck member having a head portion formed at one end thereof, and a locking bolt disposed inside the chuck member and reciprocating in an axial direction; And a movement providing unit for causing the chuck member and the locking bolt to perform relative movement in mutually opposite directions, wherein the head part is widened or contracted according to the relative movement.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clamping device for a power tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clamping device for a power tool and a power tool including the same, which can mount each blade to perform various power operations such as cutting a material such as wood or polishing tiles on a floor surface.

Among the power tools, there are those that can select a blade having an optimized shape according to the work object and attach it to perform a shape or a space work that is difficult to work with existing tools such as seam elimination, scraping, sanding, polishing and cutting.

At this time, the blade is detachably mounted to the power tool, in which the power tool includes a clamping device. However, for example, in U.S. Published Patent Application No. 2014-0110908, since the clamping element is formed as a single member, elastic deformation occurs when the tool is clamped or unclamped. That is, the conventional clamping element has a problem that fatigue can be accumulated due to repeated elastic deformation.

In addition, the clamping head on which the tool is mounted for clamping of the tool must be designed to expand or contract in the radial direction. In the course of the clamping head being opened, the clamping element is moved in the axial direction by a predetermined distance. Accordingly, there is a problem in that the electric power tool is required to be longer in the axial direction in proportion to the moving distance.

U.S. Published Patent Application No. 2014-0110908 (published April 24, 2014) U.S. Published Patent Application No. 2014-0182873 (published on April 03, 2014) Korean Registered Patent No. 10-0655317 (Registered on December 01, 2006) Korean Registered Patent No. 10-1288170 (Registered on July 15, 2013)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to minimize the size of an operating force of a lever portion required for converting between a clamping mode and an unclamping mode.

Further, it is intended to realize a shape in which fatigue and the like are not accumulated in the chuck member of the power tool even when the blade is repeatedly mounted and detached. It is also intended that the chuck unit operates quickly and stably when it is switched between the clamping mode and the unclamping mode.

Further, it is an object of the power tool including the clamping device to mount the blade manufactured and manufactured by another manufacturer. So as to prevent fine particles such as dust generated during the operation of the power tool from flowing into the interior of the power tool.

In order to solve the above problems, an embodiment of the present invention provides a chuck unit including a chuck member having a head portion at one end and a locking bolt disposed inside the chuck member and reciprocating in an axial direction; And a movement providing unit for causing the chuck member and the locking bolt to perform relative movement in mutually opposite directions, wherein the head part is widened or contracted according to the relative movement.

The locking bolt includes a bolt head on which a receiving groove is formed; A first body extending from the bolt head, the first body contacting an inner surface of the chuck member; And a second body extending from the first body, the second body extending the head portion when the end portion is inserted into the head portion.

The chuck member may be composed of a plurality of divided pieces having the same shape and arranged to surround the locking bolt.

At least one ring seating part formed on an outer peripheral surface of the dividing piece; And an O-ring made of an elastic material disposed on the ring seating portion.

The motion providing unit may include a lever portion, and the lever portion may include a pivot axis to cause the lever portion to rotate between the clamping mode and the unclamping mode.

The first and second cams having different shapes may be disposed on the pivot shaft.

Wherein the motion providing unit comprises: a steel ball which is seated in the receiving recess; A locking bolt opener for allowing both ends of the first and second cams to be in contact with the steel ball, respectively, to linearly move the locking bolt in an axial direction; And a chuck member opener whose one end is in contact with the other one of the first and second cams to allow the chuck member to relatively move in opposite directions to the locking bolt.

Wherein the first and second cams axially lift the locking bolt opener in the unclamping mode and lower the chuck member opener in the axial direction and lower the locking bolt opener in the axial direction in the clamping mode, The chuck member opener may be formed in a shape that lifts the chuck member opener in the axial direction.

Wherein the chuck unit is disposed between the chuck member and the locking bolt to release the locking bolt in the unclamping mode; And a chuck spring disposed on an outer circumferential surface of the chuck member to return the chuck member in a clamping mode.

The first and second cams convert the axial rotation of the lever portion into the reciprocating linear motion of the chuck unit.

A chuck unit including a chuck member having a head portion formed at one end thereof, and a locking bolt disposed inside the chuck member and reciprocating in an axial direction; And a clamping device for a power tool including the chuck member and the locking bolt, wherein the chuck member and the locking bolt are opposed to each other, to provide.

A spindle housing in which the chuck unit is housed; And a carrier block having one end inserted into and engaged with the spindle housing and the other end formed with a plurality of circular projections.

A rubber-made adapter housing fixedly coupled to an outer circumferential surface of the carrier block through which the fitting protrusion is exposed; And an adapter inserted into the adapter housing and coupled to an inner circumferential surface of the adapter housing, wherein the adapter has a protrusion groove corresponding to the fitting protrusion and is detachably fitted to the carrier block.

The adapter may further include coupling protrusions formed on both sides in different shapes and patterns.

And an oscillation arm for oscillating the spindle housing within a predetermined angle range in the axial direction.

Wherein the chuck member is composed of a plurality of split pieces having the same shape and arranged so as to surround the locking bolt, the split piece includes at least one ring seating part formed on the outer peripheral surface; And an O-ring made of an elastic material disposed on the ring seating portion.

Wherein the movement providing unit includes a lever portion, and the lever portion includes a pivot shaft for moving the lever portion between the clamping first mode and the unclamping second mode, And a second cam can be disposed.

As described above, according to the present invention, various effects including the following can be expected. However, the present invention does not necessarily achieve the following effects.

The clamping device of the electric power tool according to the embodiment of the present invention is designed so that the chuck member constituting the chuck unit and the locking bolt are designed to perform relative movement in opposite directions to each other so that the stroke for converting into the other mode between the clamping mode and the unclamping mode The distance can be minimized and the miniaturization of the product can be realized. At the same time, it is possible to reduce the magnitude of the operating force required to move the position of the lever portion for mode conversion.

Further, even if the chuck member is composed of at least two split pieces and the blade is repeatedly replaced, fatigue or the like is not accumulated in the chuck member. That is, the durability of the chuck member can be improved.

In the unclamping mode, an O-ring is provided on the outer circumferential surface of the chuck member to cause the head to be disturbed, thereby facilitating attachment / detachment of the blade in the unclamping process.

In addition, the motion providing unit may include a chuck member opener and a locking bolt opener that are in direct contact with the outer peripheral surfaces of the first and second cams of different shapes, so that the chuck member and the locking bolt can stably move relative to each other.

Further, the chuck unit further includes a release spring and a chuck spring, so that the chuck member and the locking bolt can be quickly returned to the original position when the lever portion is switched between the clamping mode and the unclamping mode.

The power tool according to one embodiment of the present invention can increase the competitiveness of the product by including the above-described clamp device. Further, the power tool can mount more blades by an adapter that is detachably coupled. Further, the power tool has an adapter housing made of rubber, so that fine material such as dust can be prevented from flowing into the power tool, and the adapter can be temporarily fixed in the unclamping mode.

1 is a perspective view of a power tool including a clamping device in accordance with an embodiment of the present invention;
2 is a schematic cross-sectional view of the power tool when in the clamping mode;
3 is a schematic cross-sectional view of the power tool when in the unclamping mode;
4 is a perspective view of a clamping device according to an embodiment of the present invention;
5 is a perspective view of a chuck unit according to an embodiment of the present invention;
FIG. 6 is an exploded perspective view of FIG. 5; FIG.
7 is a perspective view of a motion providing unit according to an embodiment of the present invention;
8 is an exploded perspective view of Fig.
9 is a perspective view of a lever portion according to an embodiment of the present invention.
10 is a perspective view of an adapter in accordance with one embodiment of the present invention;
11 is a bottom perspective view of Fig.
Fig. 12 is a perspective view showing a state in which a blade is mounted on the adapter of Fig. 10; Fig.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a power tool including a clamping device according to an embodiment of the present invention, Fig. 2 is a schematic cross-sectional view of the power tool when in a clamping mode, Fig. 3 is a schematic FIG. 4 is a perspective view of a clamping device according to an embodiment of the present invention. FIG.

Referring to Figs. 1 to 4, a clamping device for a power tool includes largely a chuck unit and a motion providing unit for its function. At this time, the chuck unit includes a chuck member 10 and a locking bolt 20 designed to perform relative movement in mutually opposite directions, and has a clamping mode and an unclamping mode. At this time, the motion providing unit allows the chuck unit to perform relative motion.

Here, the clamping mode refers to a positional relationship when the blade 5 is mounted and fixed to the head end 12 of the chuck member 10 by the chuck unit and the motion providing unit, Means the positional relationship when the head unit 5 is detached or detached from the front end of the head unit 12.

The blade 5 has a different shape on the surface on which the blade 5 is mounted to the power tool so that it is usually dedicated to each maker of the power tool. As a result, the compatibility between the blades 5 manufactured by different manufacturers is denied.

For example, a blade of a certain manufacturer has a mounting hole having a predetermined diameter at the center of its mounting surface, so that when the head portion 12 of the chuck member 10 is broken, To pass through the mounting holes. The head portion 12 is then spread in the radial direction so that the blade 5 can be engaged with the head portion 12. In addition, a plurality of anti-rotation holes having a size smaller than the size of the mounting hole are formed in the periphery of the mounting hole. The rotation preventing hole prevents the blade 5 from shaking in the mounted state even if it rotates in the circumferential direction by vibration or the like applied from the power tool.

Here, the circumferential direction indicates the direction in which the chuck unit rotates clockwise or counterclockwise when setting the direction in which the chuck unit of the power tool is disposed in the axial direction. Further, the radial direction indicates a direction in which the radius increases with respect to the axial direction.

FIG. 5 is a perspective view of a chuck unit according to an embodiment of the present invention, and FIG. 6 is an exploded perspective view of FIG. 5 and 6, the chuck member 10 according to the embodiment has a head 12 formed at one end thereof. This head portion 12 flares when it is in the clamping mode and is broken when it is in the unclamping mode. To this end, a locking bolt 20 reciprocating in the axial direction is disposed inside the chuck member 10.

The locking bolt 20 has an overall shape similar to a pin shape. More specifically, the locking bolt 20 extends from one side of the bolt head 22 with respect to the bolt head 22 on which the receiving groove 23 is formed, and includes a first body (not shown) 24 and the first body 24 so that the chuck member 10 and the locking bolt 20 are inserted into the head portion 12 of the chuck member 10 by the relative movement in the clamping mode, And a second body (26) for widening the opening (12).

On the other hand, in the unclamping mode, the chuck member 10 and the locking bolt 20 move in mutually opposite directions, so that the second body 26 inserted in the head portion 12 is separated from the head portion 12 , The head portion 12 is broken. That is, the locking bolt 20 linearly reciprocates by the force applied to the bolt head 22 through the motion providing unit, and the tip of the second body 26 is inserted into the head part 12 or the head part 12 .

On the other hand, the receiving groove 23 is formed at the center of the outer head surface of the bolt head 22. Further, it is preferable that the locking bolt 20 is formed integrally with a metal material.

Specifically, the chuck member 10 may be composed of a plurality of divided pieces 10a, 10b having the same shape. The divided pieces 10a and 10b are disposed around the locking bolt 20 so as to surround the same. That is, the chuck member 10 can minimize the fatigue load generated in the chuck member 10 in the process of repeatedly mounting and dismounting the blade 5 by the individual split pieces 10a and 10b spaced apart at regular intervals have. As a result, the chuck member 10 can be further improved in durability than the conventional one.

The split pieces 10a and 10b may be formed with at least one ring seating portion 15 on the outer peripheral surface. At this time, it is preferable that the ring seating portion 15 is formed particularly near the position adjacent to the head portion 12. This is because an O-ring of an elastic material is disposed on each of the ring seating portions 15 so that when the second body 26 of the locking bolt 20 is detached from the head portion 12, This is because the portion 12 is broken.

That is, in the unclamping mode, when the second body 26 of the locking bolt 20 is inserted and separated from the head 12, the O-ring is divided into a plurality of divided pieces 10a, 10b so that the head portion 12 can be brought into contact with each other. This makes it easier to attach and detach the blade 5 in the unclamping mode.

The plurality of divided pieces 10a and 10b may be disposed parallel to each other when the second body 26 is inserted into the head 12 by protruding the inner surface of the head 12 by a predetermined thickness. The end portion of the head portion 12 is formed into a latching shape protruding in the radial direction so that the mounted blade 5 is not separated when the head portion 12 is opened.

The chuck unit may further include a chuck unit holder 38 that receives the upper end portion of the chuck unit in the axial direction.

FIG. 7 is a perspective view of a motion providing unit according to an embodiment of the present invention, FIG. 8 is an exploded perspective view of FIG. 7, and FIG. 9 is a perspective view of a lever unit 50 according to an embodiment of the present invention. Referring to Figs. 7 to 9, the movement providing unit allows the chuck member 10 and the locking bolt 20 to perform relative movement in opposite directions to each other. This motion providing unit is interlocked with the operation of the lever portion 50 having the pivot shaft 52 at one end.

The lever portion 50 can be manually operated by an operator. For example, the lever portion 50 may include a structure that rotates 180 degrees around the pivot shaft 52. [ In particular, the lever portion 50 preferably has its position fixed in a clamping mode in which a power transmission operation is performed. To this end, the power tool may be provided with a lever holder 52 that allows the position of the lever portion 50 to be fixed in the clamping mode. The lever holder 52 according to an embodiment is a clip type in which the male and female clip structures are formed in the lever portion 50 and the lever holder 52 so that they are fixed to each other in the fastened state.

The first and second cams 60 having different shapes are disposed on the pivot shaft 52 of the lever portion 50. [ The first and second cams 60 are fixedly coupled to the pivot shaft 52 of the lever portion 50 and rotate in the same manner as the pivot angle of the lever portion 50. [ As a result, the members that are in contact with the outer circumferential surfaces of the first and second cams 60 can perform different motions according to the shapes of the first and second cams 60.

That is, the chuck member 10 and the locking bolt 20 can perform relative movement in opposite directions by the double eccentric cam realized by the first and second cams 60. [ This is because, when the first and second cams 60 are used, the rotational motion can be converted into a linear motion. That is, the first and second cams 60 can convert the axial rotation of the lever portion 50 into the reciprocating linear motion of the chuck unit.

Specifically, the motion providing unit may include a steel ball 32, a locking bolt opener 34 and a chuck member opener 36. [ The steel ball 32 is seated in the receiving groove 23 of the locking bolt 20. At this time, the steel ball 32 has a bead shape of a metal material. Therefore, the steel ball 32 and the locking bolt 20 can rotate relative to each other while being seated in the receiving groove 23.

Both ends of the locking bolt opener 34 are connected to the steel ball 32 and one of the first and second cams 60 so that the locking bolt 20 linearly moves in the axial direction. The locking bolt opener 34 corresponds to a connecting member for transmitting motion in a rod-like shape in most cases.

The chuck member opener 36 is brought into contact with the other one of the first and second cams 60 to move the chuck member 10 in the direction opposite to the locking bolt 20. Specifically, the chuck member opener 36 has a shape in which the upper end of the chuck unit holder 38 can be received and coupled to one side. Further, the chuck member opener 36 is formed with a tube having a through-hole with a predetermined length extending to the other side. That is, the chuck member opener 36 is similar in overall shape to the funnel. As a result, the locking bolt opener 34 is disposed in the through hole and can reciprocate axially along the through hole.

The first and second cams 60 according to one embodiment axially lift the locking bolt openers 34 and lower the chuck member openers 36 axially in the unclamping mode, The second body 26 has a shape in which the head portion 12 is detached from the head portion 12 of the chuck member 10. At the same time, the first and second cams 60 lower the locking bolt openers 34 axially in the clamping mode and elevate the chuck member openers 36 axially so that the second body of the locking bolt 20 26 are inserted into the head portion 12 of the chuck member 10 so that the head portion 12 is opened.

The chuck unit includes a release spring 42 disposed between the chuck member 10 and the locking bolt 20 for returning the locking bolt 20 in the unclamping mode, A chuck spring 44 for returning the chuck member 10 in the mode.

Specifically, the release spring 42 is disposed axially between the inner circumferential surface of the chuck unit holder 38 and the outer circumferential surface of the first body 24 of the locking bolt 20. In the unclamping mode, as the locking bolt opener 34 moves upwards in the axial direction, the release spring 42 is released from the locking bolt (not shown) by the elastic restoring force while the force pressing the locking bolt 20 in the axial direction in the clamping mode is removed 20 can be returned. As a result, in the unclamping mode, the locking bolt 20 is raised in the axial direction.

The chuck spring 44 is also disposed axially between the outer circumferential surface of the chuck member 10 and the inner circumferential surface of the spindle housing 70 receiving the clamping device. In the clamping mode, as the chuck member opener 36 moves upward in the axial direction, the force for pressing the chuck member 10 in the axial direction in the unclamping mode is removed, 10). As a result, the chuck member 10 ascends in the axial direction in the clamping mode. That is, in the clamping mode, the chuck member 10 is lifted in the axial direction, and at the same time, the second body 26 of the locking bolt 20 is inserted between the head portions 12 and the head portion 12 is opened.

The reason why the chuck member 10 and the locking bolt 20 move in opposite directions to each other as described above is that the first and second cams 60 move the locking bolt 20 in the axial direction And the chuck member 10 is further lowered in the axial direction. At this time, the chuck member 10 and the locking bolt 20 can quickly move to positions according to different modes by the elastic restoring force provided by the release spring 42 and the chuck spring 44.

As a result, the clamping device of the power tool including the first and second cams 60 can minimize the stroke while the chuck member 10 and the locking bolt 20 perform relative movement in opposite directions to each other Therefore, it is possible to reduce the magnitude of the force for axial rotation of the lever portion 50, which is required to be converted into a different mode between the clamping mode and the unclamping mode.

1 to 4, a power tool according to an embodiment of the present invention includes a chuck member 10 having a head 12 formed at one end thereof, And a movement providing unit for allowing the chuck member (10) and the locking bolt (20) to perform relative movement in mutually opposite directions, wherein the chuck member (10) and the locking bolt And a clamping device for the power tool in which the head portion 12 is opened or closed.

The chuck member 10 is composed of a plurality of divided pieces 10a and 10b having the same shape and arranged so as to surround the locking bolt 20 and the divided pieces 10a and 10b have at least one Ring O-ring 16 of an elastic material disposed on the ring seating portion 15 and the ring seating portion 15, respectively.

The movement providing unit includes a lever portion 50. The lever portion 50 includes a pivot shaft 52 for rotating the lever portion 50 between the clamping mode and the unclamping mode, 52 may have first and second cams 60 of different shapes.

 The chuck unit and the motion providing unit, which are the main components of the clamping device included in the power tool according to one embodiment, have already been described in detail and will not be described below. In addition, other than the clamping device according to the embodiment of the present invention, the main components such as the electric motor, which are indispensably required for driving the power tool, can be implemented by appropriately arranging known configurations. Is omitted.

Such a power tool includes a spindle housing 70 in which a chuck unit is received. That is, in the spindle housing 70, the chuck unit is reciprocated linearly in the axial direction. The power tool may further include a carrier block 82 having one end inserted into and engaged with the spindle housing 70 and a plurality of fitting protrusions 83a arranged on the other end side in a circular shape. At this time, the carrier block 82 may be fixed to the spindle housing 70 by a method such as press fitting. On the other hand, the fitting projection 83a has a side tapered shape.

The power tool further includes a rubber-made adapter housing 84 in which the fitting projection 83a is fixedly engaged with the outer peripheral surface of the carrier block 82 in a state where the carrier block 82 is fitted into the spindle housing 70, A protrusion groove 130 corresponding to the fitting protrusion 83a of the carrier block 82 is formed so as to be engaged with the inner circumferential surface of the adapter housing 84 so as to be detachably engaged with the carrier block 82, The adapter 100 may include a plurality of adapters.

10 is a perspective view of the adapter 100 according to an embodiment of the present invention, FIG. 11 is a bottom perspective view of FIG. 10, and FIG. 12 is a perspective view showing a state where the blade 5 is mounted on the adapter 100 of FIG. FIG.

Referring to FIGS. 10 to 12, the adapter 100 includes a body 110, a coupling protrusion 120, and a protrusion groove 130. Specifically, the body portion 110 has a flat circular ring shape. The outer circumferential surface of the body 110 is formed such that the middle portion thereof protrudes more than both sides. This is to make detachment of the adapter 100 easier.

In addition, the coupling protrusions 120 include first and second coupling protrusions 121 and 122, which are formed on both sides in different shapes and patterns, respectively. Specifically, the first coupling protrusions 121 are uniformly spaced in a circular shape at a predetermined distance from the center of the body 110 at one side of the body 110. On the other hand, the second engaging protrusions 122 are equally spaced in a circular shape along the central opening of the body portion 110 on the other side of the body portion 110.

At least one or more protrusion grooves 130 are formed on both sides of the body 110, and are arranged in a circular shape. The protrusion grooves 130 may be formed as a pair of mutually symmetrical with respect to the center of the body 110 in terms of thickness. At this time, each protrusion groove 130 has a shape in which the cross sectional area decreases as the body portion 110 is deeper in the thickness direction. For example, the projection groove 130 is formed to be tapered corresponding to the shape of the fitting projection 83a of the carrier block 82. [

Since the height of the fitting protrusion 83a of the carrier block 82 is larger than the depth of the protrusion groove 130, when the adapter 100 is coupled to the carrier block 82, the height of the fitting protrusion 83a between the adapter 100 and the carrier block 82 A gap is formed. That is, the adapter 100 can be easily separated from the adapter housing 84 due to the gap. Specifically, when the adapter housing 84 in the vicinity where the gap is located is pressed from the outside, the portion to which the adapter 100 is coupled is opened to the outside, so that the adapter 100 can be easily detached and detached.

The power tool may further include an oscillation arm 90 that is press-fitted into the spindle housing to vibrate the spindle housing 70 while rotating the spindle housing 70 within a predetermined angle range in the axial direction.

Hereinafter, a method of operating the clamping device of the power tool according to an embodiment of the present invention will be described. The clamping device has a clamping mode and an unclamping mode largely in a configuration necessary for mounting the selected blade 5 to the power tool according to the work subject.

2 and 3, in the unclamping mode, the chuck member 10 is further lowered in the axial direction than the position where the chuck member 10 is disposed in the clamping mode, The position of the head portion 12 of the first embodiment is further raised in the axial direction. The head portion 12 is closed by the O-ring 16 disposed in the ring seating portion 15 of the chuck member 10.

At this time, the selected blade 5 is fitted in consideration of the head portion 12 of the chuck member 10 and the adapter 100, and then the lever portion 50 is rotated about 180 degrees. The power tool is changed from the unclamping mode to the clamping mode and the chuck member 10 is moved in the axial direction in accordance with the shape of the first and second cams 60 disposed on the pivot shaft 52 of the lever portion 50 The locking bolt 20 is inserted into the head portion 12 of the chuck member 10 while the chuck member 10 is lowered in the axial direction. As a result, the head portion 12 is opened and engaged with the mounting hole of the blade 5 so that the blade 5 can be mounted on the power tool. Then, in order to change the blade 5 to the unclamping mode, the lever portion 50 is rotated 180 degrees again.

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, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

5: blade 10: chuck member
10a, 10b: Split piece 12: Head part
15: ring seating part 16: o-ring
20: Locking bolt 32: Steel ball
34: Locking bolt opener 36: Chuck member opener
38: chuck unit holder 42: release spring
44: chuck spring 50: lever part
52: Pivot shaft 55: Lever holder
60: first and second cams 70: spindle housing
82: carrier block 84: adapter housing
90: Oscillation arm 92: Ball bearing
94: Needle bearing 96: Crank housing
22: bolt head 23: receiving groove
24: first body 26: second body
83a: insertion projection 100: adapter
110: body part 120: engaging projection
130: projecting groove 121: first engaging projection
122: second engaging projection

Claims (17)

A chuck unit including a chuck member having a head portion formed at one end thereof, and a locking bolt disposed inside the chuck member and reciprocating in an axial direction; And
And a movement providing unit for allowing the chuck member and the locking bolt to perform relative movement in mutually opposite directions,
The head portion is opened or closed according to the relative movement,
The locking bolt includes a bolt head on which a receiving groove is formed; A first body extending from the bolt head, the first body contacting an inner surface of the chuck member; And a second body extending from the first body, the second body extending the head portion when the end portion is inserted into the head portion.
delete The method according to claim 1,
Wherein the chuck member is composed of a plurality of divided pieces having the same shape and arranged so as to surround the locking bolt.
The method of claim 3,
At least one ring seating part formed on an outer peripheral surface of the dividing piece; And
And an O-ring made of an elastic material disposed on the ring seating portion.
The method according to claim 1,
Wherein the motion providing unit includes a lever portion,
And the lever portion includes a pivot shaft for rotating the lever portion between the clamping mode and the unclamping mode.
6. The method of claim 5,
And the first and second cams having different shapes are disposed on the pivot shaft.
The method according to claim 6,
The motion providing unit
A steel ball seated in the receiving groove;
A locking bolt opener for allowing both ends of the first and second cams to be in contact with the steel ball, respectively, to linearly move the locking bolt in an axial direction; And
And a chuck member opener whose one end is in contact with the other one of the first and second cams to cause the chuck member to relatively move in opposite directions with respect to the locking bolt.
8. The method of claim 7,
The first and second cams
In the unclamping mode, axially elevating the locking bolt opener and lowering the chuck member opener axially,
Wherein the locking bolt opener is lowered in the axial direction in the clamping mode, and the chuck member opener is formed in a shape that axially lifts the chuck member opener.
The method according to claim 1,
Wherein the chuck unit is disposed between the chuck member and the locking bolt to release the locking bolt in the unclamping mode; And
And a chuck spring disposed on an outer circumferential surface of the chuck member to return the chuck member in a clamping mode.
The method according to claim 6,
Wherein the first and second cams convert an axial rotation of the lever portion into a reciprocating linear motion of the chuck unit.
A chuck unit including a chuck member having a head portion formed at one end thereof, and a locking bolt disposed inside the chuck member and reciprocating in an axial direction; And
And a movement providing unit for allowing the chuck member and the locking bolt to perform relative movement in mutually opposite directions,
And a clamping device of the power tool in which the head part is widened or crushed according to the relative movement,
A spindle housing in which the chuck unit is housed; And a carrier block having a plurality of fitting protrusions formed at one end thereof by being inserted into and engaged with the spindle housing and circularly arranged at the other end side face.
delete 12. The method of claim 11,
A rubber-made adapter housing fixedly coupled to an outer circumferential surface of the carrier block through which the fitting protrusion is exposed; And
And an adapter which is inserted into the adapter housing and is engaged with an inner circumferential surface of the adapter housing, wherein a protrusion groove corresponding to the fitting protrusion is formed and detachably fitted to the carrier block.
14. The method of claim 13,
Wherein the adapter further comprises coupling protrusions formed on both sides of the adapter, the coupling protrusions being formed in different shapes and patterns.
12. The method of claim 11,
And an oscillation arm for oscillating the spindle housing axially within a predetermined angle range.
12. The method of claim 11,
Wherein the chuck member is composed of a plurality of divided pieces having the same shape and arranged to surround the locking bolt,
At least one ring seating part formed on an outer peripheral surface of the dividing piece; And
And an O-ring of elastic material disposed on the ring seating portion.
12. The method of claim 11,
Wherein the motion providing unit includes a lever portion,
And the lever portion includes a pivot shaft for moving the lever portion between the clamping first mode and the unclamping second mode,
And first and second cams of different shapes are disposed on the pivot shaft.

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