JPS61203205A - Chuck apparatus for rotary tool - Google Patents

Abstract

PURPOSE:To perfectly hold the pulling-out direction by carrying-out chucking in the direction of revolution and fastening a tool by utilizing the pulling-out force directly acting onto a rotary tool. CONSTITUTION:A fastening force is applied through a holding tool 40 onto the tightened part (t) of a rotary tool T by a thrust chuck Y. Said press- fastening force is applied along the tapered inner peripheral surface 51 of a thrust chuck case 50 surrounding the holding tool 40, accompanied by the shift of the rotary too T in the direction of the axis center line of the rotary tool T. The revolution direction of the rotary tool T is held by a rotary driving chuck D, permitting automatic center adjustment, and the fastening action for the tightened part (t) can be released by a releasing means R, and also the easy release from the chuck D is permitted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chucking device for a rotating tool, and particularly to a chucking device for a rotating tool, and in particular, a method for chucking the rotating tool and using extraction force that acts directly on the tool to tighten the tool. The present invention relates to a chuck device that more completely holds the extraction direction.

[Conventional technology]

There are friction chucks, collet chucks, and locking chucks as chuck devices for rotary tools that have been widely used in the past, and each has the advantage of being relatively easy to handle.

[Problem that the invention seeks to solve]

However, in the friction chuck shown in Japanese Utility Model Publication No. 56-51846, elastic materials such as rubber and plastic are used for the friction retaining part, which results in poor durability and requires a jig for tightening and releasing. It also had the disadvantage that it could not be sterilized using high heat. Also, special public service 1978-3
In the collet chuck shown in No. 37, the clamping part is limited to only one part, so the swing is large, and the operating part must be operated to tighten the rotary tool, so the chuck must be changed each time it is tightened. However, in the case of an engaging chuck such as the one disclosed in Japanese Utility Model Application No. 56-42209, its use is limited to rotary tools with retaining grooves formed therein, and it also has the disadvantage of being prone to whirling during rotation. had.

[Means for solving problems]

Rotary tool chuck device wt/i% of the present invention In FIGS. 1 and 2, the gripper ■ inserted through the clamped portion (1) of the one-rotation tool (T) is bent around the gripping tool (1). A thrust chuck (1) that generates a clamping force on the tightened part (t) by moving in the axis direction of the rotary tool (T) along the six rings of the tapered inner peripheral surface of the thrust chuck case 44e4; The rotational driving force from the rotational drive shaft Q is transferred to the rotating tool (
The rotary tool (T) is moved by pressing and moving the rotary drive chuck (■), which generates a self-help centripetal clamping force in the rotational direction, and the thrust chuck case member or gripping tool (■). 'Y) and a release means (R) for simultaneously releasing from the rotary drive chuck (O).

The present invention generates a clamping force in the direction of rotation in a self-help centripetal manner, and utilizes the extraction force that acts directly on a one-rotation tool to generate a clamping force against the tool from a tapered surface via a gripping tool, and extracts the tool. It is an object of the present invention to provide a highly durable chucking device for a rotary tool that can more completely hold the direction, easily release the tool using a built-in release means, and can be subjected to high-temperature sterilization. do.

[Effect]

The chuck device for a rotary tool of the present invention has a gripping tool ( A thrust chuck case ring (A) that surrounds the gripping tool (T) as the rotary tool (T) moves in the axial direction
Apply clamping force along the tapered inner circumferential surface 6]) of 62).

The tool is securely held in the extraction direction, and the rotary tool (T) is securely held in the rotational direction in a self-aligning manner by the one-rotation drive chuck (■), and the thrust chuck case is held or gripped by the release means (R). By pressing and moving the tool (A), it is possible to easily release the clamping action of the gripping tool (61) on the tightened part (1) received from the taper inner circumferential surface @Zo, and at the same time, it can also be removed from the rotationally driven chuck (D). , it is liberating.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a chuck device for a rotary tool according to the present invention will be explained with reference to the drawings.

First Embodiment> A perspective view of the barrel and retainer, FIG. 4 is a cross-sectional view of the rotary drive chuck in a relaxed state, FIG. 5 is a cross-sectional view of the same in the tightened state, and FIG. FIG. 3 is a cross-sectional view showing a tapered cam surface of a chuck tightening member used only in clockwise rotation.

Figures 1 and 3~! In FIG. 6, the structure of the head (1) of a contra-angle type dental handpiece (6) incorporating the rotary tool chuck device of the present invention will be outlined. Inside the head (1) of the handpiece (6), a rotary drive shaft (1) having a blade part (c) is connected to the bearing (4) and the inner diameter of the bearing (5) through a slight gap (6). It is rotatably supported. These bearings (4) and (5) are provided with holes (7) for supplying air to the gap (6).
A hole (8) for injecting air into the blade part (c) and a bearing (
4) A hole (9b) for supplying air to (5) is bored respectively. CP) is a gasket to prevent air from leaking to the bearings (4) and (5), and is a pair of vanes (c) on the 0-rotation drive shaft (1), which are provided one pair each on the upper and lower sides of the air supply annular groove. On the end face (2) of the bearings (4) (5) are integrated into the handpiece head (1) by means of a cap (1a).

installed. On the other hand, the rotary tool chuck device of the present invention incorporated into the hand piece (6) has a one-turn operator (T
) is inserted into the tightened part (1) of the gripper ■ along the tapered inner circumferential surface (2) of the thrust chuck case (62) surrounding it in the axial direction of the rotary tool (T). The thrust chuck (1) exerts a clamping force on the tightened part (1) by moving K, and the rotating ball A (T) by pressing and moving the thrust chuck case member or gripping tool (2). The rotational driving force from the thrust chuck (1) and the one-rotation drive shaft q0 is transmitted to the rotating ball A (T),
From a rotary drive chuck (D) that generates a clamping force in the rotational direction in a self-aligning manner, and a rotary drive shaft +70 that simultaneously releases the rotary tool (T) from the thrust chuck (1) and the rotary pivot chuck (D). Rotation M that transmits the rotational driving force of to the rotary tool (T) and generates a clamping force in the rotational direction in a self-aligning manner.
It is equipped with a release means (9) for simultaneously releasing the rotary tool (T) from the Idt chuck (9), the thrust chuck CY) and the rotary drive chuck (2).

The thrust chuck (2) has a gripping tool (toward) that has an inner diameter larger than the outer diameter of the to-be-tightened part (1) of the rotary tool (T), and has a cylindrical shape that accommodates the to-be-tightened part (1). a retainer (b) having a body shape and provided with at least one pair of conical through holes (6) extending radially in the circumferential direction thereof, and having a diameter larger than the wall thickness of the retainer (goods); Each through hole (6
), and the gripping tool (7) has an inner diameter larger than the outer diameter of the retainer (6), and a tapered surface of an inner diaphragm on the lower part. It is incorporated into the formed thrust chuck case so as to be movable in the axial direction of the tool (T). In the assembled state, when the grip A (to) is lowered, it comes into contact with the tapered surface 6η of the ball ah, and the curved surface of the ball protrudes from the inner peripheral surface of the retainer (B) within the first through hole (C). At this time, the inscribed diameter of the ball sakaki is smaller than the outer diameter of the tightened portion (1) of the tool. Furthermore, even when workpiece A (T) is pulled out, the circumscribed diameter of the ball that contacted the retainer (b) is the same as that of the case -〇tapered surface (
The taper angle of the conical through hole is selected to be larger than the minimum diameter of the case ring, and is always caught on the tapered surface of the case wheel. That is.

Except when the tool is released, the retainer (B) is always kept at a distance from the rotary drive chuck glue retainer (■) at the lower part.

The flange at the upper end of the thrust chuck case cap is connected to the coil spring by the flange at the upper end of the rotary drive shaft (to), and then to the step (c) formed in the hollow part of the rotary drive shaft (to) in the longitudinal direction (coinciding with the axial direction of the tool). It is movable and supported by bullets.

A tool release means (R) is provided in the upper part of the thrust chuck (2). This release means (R) is attached to the top of the head (1) of the chuck device of the one-turn tool (
A push button 6]) loosely fitted so as to be able to be displaced in the axial direction of the head (1), a spring ring that biases the push button to project from the top of the head (1), and a spring ring that urges the push button to protrude from the top of the head (1); The rotational drive shaft G'0 above the thrust chuck case member at the bottom
It consists of a pressing body (50) that is loosely fitted into the upper part of the hollow part so as to be movable in the axial direction of the rotary tool (T) and transmits the downward displacement of the push button (61) to the thrust chuck case ring. has been done. The suppressor (to) has a protrusion (63a) formed at its upper end that protrudes from the upper end face of the drive shaft ffO, and a hole (63b) for guiding the tightened part (1) of the tool from the lower end face. ) are formed coaxially.

A spring is installed between the lower end surface of the suppressor and the retainer (2), which presses the ball against the tapered surface (2) of the thrust chuck case member via the retainer (2). This pressing body ring is loosely fitted into the hollow part of the drive shaft, is always urged upward by a spring, and is provided on a bush q◆ which is integrally fixed at its lower part. During the rotation of the rotating shaft Q1, which is a one-rotation part sealed by a cap (C) together with the rotary drive chuck (D) and the thrust chuck (Y), a protruding part facing the pressing body (
A gap is provided between the upper end surface of the spring 63 and the concave spring so that they do not come into contact with each other. An emergency extraction through-hole is formed in the center of the push button ■ and the press body to insert a push rod in case the tool (T) cannot be removed by operating the push button e due to some obstacle. ing.

The rotary drive chuck (D) has an inner diameter larger than the outer diameter of the rotary tool (T), and has a tightened portion (1) of the rotary tool (T).
>, and is provided with at least one row (three rows in the figure) in the vertical direction and four radially penetrating through holes spaced at 90° intervals in the circumferential direction. Between the retainer ■ and a chuck tightening member having an inner diameter larger than the outer diameter of the retainer ■, in which the retainer ■ is relatively rotatably installed, and a concave tapered cam surface l provided on the inner peripheral surface. and a ball (2), which is held rotatably in a through hole (2) through which the retainer (1) penetrates, and has a diameter slightly larger than the wall thickness of the retainer (2). ) is integrated with the rotary drive shaft Q in a non-rotatable state, and the retainer (2), which is not integrated, is equipped with a holding linter such as an O-ring that holds the rotary tool (T) by elastic force. When a cutting load is applied to the rotary tool (T), the retainer (2) independently rotates slightly within the surface area of the concave tapered cam surface (1) relative to the tightening member (T) integrated with the drive shaft qO. Due to the rotation, the ball (2) is pressed against the tapered cam surface J of the chuck tightening member (7) through the retainer (2), and the reaction force thereof presses the side surface of the rotary tool (T). Then, tighten and hold the rotary tool (T). Chuck tightening member a4c, multiple blades forming an air turbine (c)
The other retainer that is not integrated with the rotary drive shaft (A) is the chuck tightening member (G).
When a rotational force is transmitted to the rotary tool (T) and a cutting load is applied to the rotary tool (T) elastically supported through the ring (2), the concave tapered cam surface (1) independently moves against the surface chuck tightening member (4). It rotates slightly within the area. By this rotation of the retainer (■) with respect to the chuck tightening member diagram, the ball circle is transferred along the tapered cam surface (11) K of the chuck tightening member (toward) while being held by the retainer J, and is moved in the direction of the smaller gap due to the wedge action. The cam surface 1 is pressed, and the side surface of the rotary tool (T) is strongly pressed by the reaction force to hold it tightly. In order to reduce initial slippage, the taper angle between the tapered cam surface l and the inner circumferential surface of the chuck tightening member (2) is made extremely small, and the tapered cam surface l is connected to the curved portion of the largest concave portion with a smooth curve. The diameter (B) of the ball ■ is larger than the wall thickness of the retainer I and smaller than the distance between the inner circumferential surface and the outer circumferential surface of the rotary tool (T) in the diagram of the chuck tightening member. The selection is determined as appropriate depending on the outer diameter of the rotary tool (T). Even when the tool (T) is inserted,
Also, even when the tool (T) is pulled out, the ball field does not go over the concave tapered cam surface l of the tightening member (4) in the rotational direction, and the balls (to) do not cross the through hole of the retainer field. The hole is made into a conical shape so that it does not fall off from the hole toward the inner diameter side. This conical shape is formed so that a part of the curved surface of the ball ■ protrudes toward the inner diameter side of the retainer ■, and the inscribed diameter of the ball ■ is smaller than the diameter of the tightened part (1) of the tool. There is. The shape of the cam surface I shown in FIG. 184 and FIG. 5 is for reversible use, and the shape of the cam [111] shown in FIG. This is for rotation in a specific direction. Moreover, as shown in FIG. 7, instead of the retainer mother housing the ball field, the roller ω is provided with a penetrating hole #C21 having a tapered surface.
) It is also possible to use a retainer ■ housed in the roller ■. Correspondingly, the tapered surface of the chuck tightening member is also formed over a length so that it can uniformly abut against the roller ■. The holding ring for the tool (T) + 231 and the airtight O-ring (P) used in the air turbine section are made of silicone rubber with excellent heat resistance, so it is difficult to hold the tool (T) in the head of the handpiece. Thermal disinfection is performed using high-temperature steam, etc. while the device is being worn.

In addition, as detailed in the specification and drawings of Special Patent No. 59-77692 by the applicant of the present application, instead of the above-mentioned rotary drive chuck (1) of IC1, a retainer is fixedly attached to the rotary drive shaft and tightened. It is also possible to use a system in which the members are rotatably fitted loosely and the rotational force is transmitted to the tool via the retainer.

Furthermore, it is also possible to provide the retaining ring (C) and chuck tightening member (G) fitted on the retainer I, and the structure thereof can be changed, for example, to the chuck tightening member (G) as shown in FIGS. 1 and 2. (G) or a synthetic rubber such as silicone rubber or plastic that is fitted into the ring-shaped groove provided on the inner peripheral surface of the retainer and has an inner diameter slightly smaller than the outer diameter of the one-turn tool (T). A structure consisting of a metal elastic ring, or a structure in which a cylindrical magnet having an inner diameter slightly larger than the outer diameter of the rotary tool (T) is attached or fitted to the chuck tightening member or retainer.

Alternatively, attach a cylindrical elastic body having an inner diameter slightly smaller than the outer diameter of the rotary tool (T) to the chuck tightening member (7) or retainer ■l.
or the above-mentioned chuck tightening member (G).
Also, a part of Haritainer ■■ may be configured as an elastic body, and it is desirable that the configuration of these holding parts is heat resistant.
When holding T), the rotating ball A (T) can be inserted into the holding part by hand, and the rotating ball A (T) can be inserted into the holding part by hand.
When a cutting load is applied to (T), the ball Enmata 1jc1
- It is sufficient if it works to move the (to) to the tapered cam surface I. Furthermore, any material that has substantially the above-mentioned effect can be used as a holding member.

Next, we will explain the operation of the thrust chuck (to).The operation of the single rotation drive chuck Φ) will be explained in the previous special section. l
As stated in the application document No. 59-77692, the rotational torque transmitted from the member (in this example, the chuck tightening member (g)) that is integrated with the one-rotation drive shaft (to) and the tool. (T) is chucked by itself due to the load applied to it, and the ball is released after the drive shaft (to) stops.
is wedged into the taper cam surface l to hold the tool (T) in the rotational direction.

Since the rotational moment of the rotary tool (T) becomes 0, it is released simultaneously with the thrust chuck (Y) by operating the push button Oη.

When inserting the rotary tool (T), the rotary tool (151) inserted into the inner diameter of the retainer and comes into contact with the ball sakaki.

While in contact with the ball sakaki, the retainer target is pushed up and a gap is created between the tapered surface (2) of the thrust chuck case (to) and the ball sakaki, and the inscribed diameter of the ball ■ increases, allowing the cutting tool to pass through. Hole (63b) of pressing body (61)
inserted into.

When the holding tool (T) in the axial direction of the rotary tool is inserted, the tool (T) and the tapered surface of the thrust chuck case member ( During 2), yj(-ru) is held in a biting state.In this state, it is impossible to remove the cutting tool^.

By pressing the extraction push button (46) of the rotary tool, the pushing body is pushed down against the elasticity of the spring, and the thrust chuck case is also pushed down, and the retainer (B) is also pushed down by the force of the spring. The end face of the retainer (6), which is synchronized with the movement tz of the thrust chuck case (62), comes into contact with the retainer, and the movement of the retainer stops. From this state, the thrust chuck case ring is further pushed down, creating a gap between the tapered surface of the thrust chuck case member and the circumscribed part of the ball sakaki, and this gap creates a gap between the tool (T) and the tapered surface of the thrust chuck case ring. The biting state caused by the ball (to) during 6η is completely released. In addition, a rotary drive chuck ■) C, a tool (
If T) is not rotating, the clamping force of the ball ■ will not work in the direction of strengthening, so a weak collision caused by the operation of the push button 11) will cause the ball ■ to move toward the side where the play of the taper cam surface is greater and the tool can be removed by hand. (T) can be released to the extent that it can be extracted.

<Second Embodiment> FIG. 2 is a vertical cross-sectional view showing a rotary tool chuck device of this embodiment.1 A contra-angle type dental handpiece (I ()
1 rotation drive shaft (To) Ball bearing (B) (To)
The 6-rotation drive chuck (D) and the release means (R) rotatably supported on the shaft have the same structure as that used in the first embodiment, so a description thereof will be omitted. The thrust chuck (Y) in this example is a one-rotation tool (
T) is capped on the tightened part (1), has a circumscribed tapered surface (56) on the lower outer periphery, and has a plurality of longitudinal slits (B) extending at least to the tapered surface (G). A thrust chuck having a substantially cylindrical gripping tool (7) having a gripping tool (7), and having the gripping tool (1) inside so as to be freely slidable in the longitudinal direction, and having a circumferential tapered surface (56) corresponding to the same taper surface on the inner surface. The thrust chuck case is integrally formed with the hollow circumferential wall of the rotational drive shaft. Therefore, when the tool (T) is strongly inserted into the gripper ■, the tapered surface t4 of the thrust chuck case
presses the tapered surface (1) of the gripper, and the lower part of the gripper (7), which is made flexible by the slit (6), clamps the tightened part (1) of the tool. The chuck release means of the second embodiment is also carried out in the same manner as in the first embodiment.

Both the first embodiment and the WJ2 embodiment have been described in which the chuck device of the present invention is applied to a contra-angle type dental handpiece, but it can be used not only for straight-type dental handpieces but also for other types of woodworking, ironwork, and civil engineering. Needless to say, it can be used as a chuck device for holding rotary tools such as drills and excavators used in work.

〔Effect of the invention〕

As described above, according to the rotating tool chuck device of the present invention, the rotating tool (
For the tightened part (1)'' of T), the tightened part (1)
As the one-rotation tool (T) moves in the axial direction through the gripper (A) inserted in the ) A clamping force is applied along the ring to securely hold the tool in the extraction direction, and the tool is held in the direction of one rotation by the rotary drive chuck Φ), and the release means (thrust chuck case ring or gripping tool) Press and move the tightened part (1), which is received from the tapered inner peripheral surface 6]) (E).
The clamping action in the thrust direction and rotational direction can be simultaneously and easily released.

In addition, the chuck device of the present invention is capable of self-helping centripetally gripping the rotary tool (T) in the rotary drive chuck (2) and performing accurate centering, as well as being able to eliminate variations in the shaft diameter of the rotary tool (T). Tightening member (a) Easily absorbs abrasion of the field without reducing the tightening force, and furthermore, high-temperature sterilization can be carried out extremely easily with the rotating tool attached.

It is possible to greatly improve handling properties and, as mentioned in Vim, durability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a chuck device for a rotary tool according to the first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing a chuck device according to the second embodiment, and FIG. A perspective view of the ball and retainer of the rotary drive chuck, Figure 4 is a cross-sectional view of the rotary drive chuck in a relaxed state, Figure 5 is a cross-sectional view of the same in the tightened state, Figure 6 is a clockwise view of the rotary tool. A cross-sectional view showing the tapered cam surface of a chuck tightening member used only by rotation,
FIG. 7 is a perspective view of a gripper using rollers according to the present invention. (Explanation of symbols) 1.- Head of chuck device (head of handpiece). 1G - chuck tightening member, 11 - taper cam surface, 2
0.20'-Retainer, 21...Through hole, 21'-
- Groove that penetrates m, 3G...Ball %30-...Roller, 40...Gripper, 41...Retainer, 43-Ball, 46...Circumscribed tapered surface, so, ss-・Thrust chuck case, 51.56-・Tapered inner circumferential surface, D
...Rotary drive chuck, R...Release means, T-single rotation tool, T-same tightened part, Y-thrust chuck. - Above - Applicant Morita Manufacturing Co., Ltd. Agent
Patent Attorney (6235) Hidehiko Matsuno Figure 1 Figure 2 Figure 7 Figure 3 n Figure 4 Figure 5 Figure 6 Figure 11'

Claims (1)

[Claims] 1. The gripper (40) inserted through the tightened portion (t) of the rotary tool (T) has a tapered thrust chuck case (50) (55) surrounding the gripper (40). Inner peripheral surface (51) (56)
A thrust chuck (Y) that generates a clamping force on the tightened part (t) by moving in the axial direction of the rotating tool (T) along A rotary drive chuck (D) that transmits driving force to the rotary tool (T) and generates a self-help centripetal clamping force in the rotational direction, and the thrust chuck case (50) or the gripping tool (40).
A chuck device for a rotary tool, comprising a releasing means (R) that simultaneously releases the rotary tool (T) from a thrust chuck (Y) and a rotary drive chuck (O) by pressing and moving the rotary tool. . 2. The thrust chuck (Y) has a cylindrical shape that has an inner diameter larger than the outer diameter of the tightened portion (t) of the rotary tool (T) and accommodates the tightened portion (t). and at least one pair of radially penetrating through holes (41) in the circumferential direction thereof.
A retainer (41) is provided with a retainer (41), which together with the retainer (41) forms a gripping tool (40), has a diameter larger than the wall thickness of the retainer (41), and is housed in each through hole (42). The ball (43) has an inner diameter larger than the outer diameter of the retainer (41), and the retainer (41) has an inner diameter larger than the outer diameter of the retainer (41).
is assembled so as to be movable in the axial direction of the tool (T), and a tapered surface (51) of an inner diaphragm that comes into contact with the inner circumferential surface when balling and presses against the tightened part (t) is provided, and a rotary drive shaft (70 2. The chuck device according to claim 1, further comprising a thrust chuck case (50) held in the hollow part of the chuck case (50). 3. The thrust chuck (Y) is capped on the tightened portion (t) of the rotary tool (T), has an outwardly expanding tapered surface (46) on the outer periphery of the lower part, and has at least the tapered surface ( 46
), the gripping tool (40) is installed inside the gripping tool (40) to be slidable in the longitudinal direction, and has a tapered surface (46). )
2. The chuck device according to claim 1, further comprising a thrust chuck case (55) having a tapered surface (56) that expands outward in accordance with the above. 4. The release means (R) is a push button (61) loosely fitted to the upper part of the head (1) of the chuck device of the rotary tool so as to be displaceable in the axial direction of the rotary tool (T). , a spring (62) that urges the push button (61) to protrude from the top of the head (1), and a rotation drive of the upper thrust chuck cases (50) and (55) below the spring (62). A rotary tool (T) is attached to the top of the hollow part (X) of the shaft (3).
A pressing body (63) and a pressing body (63) are loosely fitted to be movable in the axial direction of
63) is always pushed upward (65)
A chuck device according to claim 1, which comprises: 5. The rotary drive chuck (D) has a cylindrical shape that has an inner diameter larger than the outer diameter of the rotary tool (T) and accommodates the tightened portion (t) of the rotary tool (T), A plurality of axial grooves (21) that penetrate in the radial direction in the circumferential direction...
・Or a retainer (20) provided with a through hole (21) (
20)' and a tapered cam surface (11) having an inner diameter larger than the outer diameter of the retainer (20), into which the retainer (20) is relatively rotatably incorporated, and a concave tapered cam surface (11).
) is held rotatably in the groove (21)' or through hole (21) through which the retainer (20) (20)' passes, and the retainer (20) ) (20)' or a ball (30) having a diameter larger than the wall thickness of the retainer (20) (20)' and/or the chuck tightening member (10). One is integrated with the rotary drive shaft (70) in a non-rotatable state, and the other retainer (20) (20)' or the chuck tightening member (10) that is not integrated is subjected to elastic force and/or magnetic force. Therefore, the holding part (A) that holds the rotary tool (T)
), and when a cutting load is applied to the rotary tool (T), one integrated with the drive shaft (70) and the other independently operate within the area of the concave tapered cam surface (11). The roller (30) or the ball (30)' is rotated slightly by the rotation, and the roller (30) or the ball (30)' is rotated slightly.
20) (20)' is pressed against the tapered cam surface (11) of the chuck tightening member (10), and the side surface of the rotary tool (T) is pressed by the reaction force, so that the rotary tool (T)
2. The chuck device according to claim 1, wherein the chuck device is configured to tighten and hold the chuck device. 6. The chuck device according to claim 3, wherein the thrust chuck case (55) is integrally formed with a hollow circumferential wall of the rotational drive shaft (70).