JPH0890316A - Chuck device - Google Patents

Abstract

PURPOSE: To make it sufficiently resistible to even to load being large in the reverse direction by apposingly installing two inclined engaged teeth appearing at the side of an axial base end of a nut cylinder in an outer boundary of this nut cylinder, and setting up an engaged tooth cylinder apposed with these inclined engaged teeth to be engaged with the former at the end face. CONSTITUTION: After gripping a base cylinder 4 and having this chuck unit attached to a spindle of a metalcutting machine tool, a turning cylinder 12 is rotated, jaws 3 expanded wide and then being retracted, a tool is installed among these jaws 3, rotating the turning cylinder 12 in reverse by one hand, these jaws 3 are contracted and advanced forward, compressing the tool tight, and a lock operating cylinder 6 is turned round into a state of being locked by the hand. In brief, when the lock operating cylinder 6 is rotated and a projection goes down from an inclined step part and slides to some extent, an engaged tooth cylinder 10 shifts to the tip side of a nut cylinder 1, and both engaged teeth 5 and 8 in a state of nonengagement are engaged with each other, coming into a state of being locked. In addition, when the lock operating cylinder 6 is rotated in reverse, and the projection ascends the inclined step part 9 and slides against spring force of a coil spring 23, both these engaged teeth 5 and 8 come to a state of nonengagement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck device for holding a tool.

[0002]

2. Description of the Related Art Conventionally, as a chuck device for gripping a tool, a type in which a claw is expanded / contracted by revolving by gripping a rotary cylinder provided in the main body by hand without using a handle or the like separate from the main body Have been proposed.

By the way, in the above-mentioned conventionally proposed chuck device, a first member formed by fitting the nut cylinder 1 with the base cylinder 4 in a non-rotating state, and the nut cylinder 1 is screwed by a left screw. The pawl advancing / retreating member 2, a plurality of pawls 3 connected to the pawl advancing / retreating member 2, a pawl holding member 11 for holding the pawl 3, and a rotary cylinder 12 fitted on the pawl holding member 11. , The claw advancing / retreating member 2, the claw holding member 11, and the rotating cylinder 12 are integrally configured to rotate together with the second member, and the claw 3 is rotated by rotating the rotating cylinder 12. There is a chuck device provided with a self-tightening mechanism configured to move back and forth for expansion and contraction (the same components as those in this embodiment are designated by the same reference numerals).

This self-tightening mechanism is intended to strengthen the gripping force of the claw 3 with respect to the tool by the left screw action of the nut cylinder 1 and the claw advancing / retreating member 2 when the main body rotates in the normal direction.

By the way, in such a chuck device with a self-tightening mechanism, since the self-tightening mechanism does not act on a load in the reverse rotation direction of the main body, the chuck device moves in the reverse rotation direction at the time of a sudden stop during the forward rotation cutting operation. When the moment of inertia of is applied, the gripping force of the claw 3 with respect to the tool is loosened, and the tool may be dropped.

Therefore, in order to prevent this from happening, a locking means composed of a known ratchet mechanism is provided, and a self-tightening mechanism acts on the load in the forward rotation direction to act on the load in the reverse rotation direction. Has proposed a chuck device with a lock means for making the locked state appear by the ratchet mechanism, as disclosed in, for example, Japanese Patent Publication No. 61-1242.

[0007]

However, since the ratchet mechanism is complicated, the locking means constituted by the ratchet mechanism has a large number of parts and a high cost, and the assembling work is very troublesome.

As is well known, the ratchet mechanism only loads one ratchet tooth and one ratchet pawl, and cannot bear such a large load.
Since this ratchet mechanism must be provided in a limited space of the chuck device and cannot be formed larger than necessary, it cannot withstand a large load in this respect as well.

Specifically, it can withstand a load such as a sudden stop during the forward rotation cutting work, but cannot withstand the reverse rotation cutting work. That is, considering that the total cutting torque is applied to one ratchet tooth and one ratchet pawl during reverse cutting work, the reliability is remarkably reduced and it cannot be used for actual work.

Generally, in the case of tapping, the reverse rotation cutting is performed after the normal rotation cutting descent, but the tapping operation is difficult with the locking means constituted by the ratchet mechanism for the above reason.

The present invention provides a chuck device that solves the above problems.

[0012]

The gist of the present invention will be described with reference to the accompanying drawings.

A first member formed by fitting the base cylinder 4 into the nut cylinder 1 in a non-rotatable state, a pawl advancing / retracting member 2 screwed to the nut cylinder 1 by a screw, and a pawl advancing / retracting member 2 are provided in series. It is composed of a plurality of claws 3, a claw holding member 11 that holds the claws 3, and a rotating cylinder 12 that is fitted to the claw holding member 11. The claw advancing and retracting member 2, the claw 3, the claw holding member 11, and the rotating cylinder. 12 and a second member configured to rotate together as a unit, and a rotating cylinder.
In a chuck device that expands / contracts the claw 3 by rotating the claw 12, a position between the claw holding member 11 and the base cylinder 4 appears on the outer periphery of the nut cylinder 1 on the proximal side in the axial direction of the nut cylinder 1. The locking operation cylinder 6 which is fitted to the outer circumference of the locking tooth 5 is provided, and the locking operation cylinder 6 is fitted to the nut cylinder 1 and the locking operation cylinder 6 is elastically biased toward the base end of the nut cylinder 1 to provide a locking tooth tube 10 in which inclined locking teeth 8 for locking the locking tooth 5 are arranged side by side on the end surface. Is fitted to the nut cylinder 1 so that the locking teeth 8 and the locking teeth 5 face each other, and the locking tooth cylinder 10 is elastically biased toward the tip side of the nut cylinder 1. The present invention relates to a chuck device.

A first member formed by fitting the base cylinder 4 into the nut cylinder 1 in a non-rotating state, a pawl advancing / retracting member 2 screwed to the nut cylinder 1 with a screw, and the pawl advancing / retracting member 2 are continuously provided. It is composed of a plurality of claws 3, a claw holding member 11 that holds the claws 3, and a rotating cylinder 12 that is fitted to the claw holding member 11. The claw advancing and retracting member 2, the claw 3, the claw holding member 11, and the rotating cylinder. 12 and a second member configured to rotate together as a unit, and a rotating cylinder.
In a chuck device that expands / contracts the claw 3 by rotating the claw 12, a position between the claw holding member 11 and the base cylinder 4 appears on the outer periphery of the nut cylinder 1 on the proximal side in the axial direction of the nut cylinder 1. The lock operating cylinder 6 is provided in parallel, and the lock operating cylinder 6 is fitted to the outer peripheral position of the locking tooth 5 and has the push-up portion 7 formed therein. When the lock operation cylinder 6 is fitted, the lock operation cylinder 6 is elastically biased toward the proximal end of the nut cylinder 1, and inclined locking teeth 8 for locking the locking teeth 5 are arranged in parallel on the end face and an inclined step is formed at the lower edge of the peripheral wall. The locking tooth tube 10 having the portion 9 is provided, and the locking tooth tube 10 is attached to the nut tube 1.
And the locking teeth 8 and the locking teeth 5 are opposed to each other and the locking tooth cylinder 10 is elastically biased toward the tip end side of the nut cylinder 1, and the lock operation cylinder 6 is rotated and pushed up. As the part 7 slides up and down the inclined step part 9, the locking tooth tube 10 is moved in the axial direction of the nut tube so that both the locking teeth 5 and 8 in the engaged state are disengaged. The present invention relates to a chuck device having the above structure.

A first member formed by fitting the base cylinder 4 into the nut cylinder 1 in a non-rotatable state, a pawl advancing / retreating member 2 screwed to the nut cylinder 1 by a screw, and the pawl advancing / retreating member 2 are continuously provided. It is composed of a plurality of claws 3, a claw holding member 11 that holds the claws 3, and a rotating cylinder 12 that is fitted to the claw holding member 11. The claw advancing and retracting member 2, the claw 3, the claw holding member 11, and the rotating cylinder. 12 and a second member configured to rotate together as a unit, and a rotating cylinder.
In a chuck device exclusively for tapping, in which the claw 3 is expanded / contracted by rotating the claw 3 by rotating the claw holding member 11 and the base cylinder 4, the axial base end of the nut cylinder 1 is located on the outer periphery of the nut cylinder 1. Side by side, the inclined locking teeth 5 appearing side by side,
The engaging teeth 5 are fitted on the outer peripheral positions of the engaging teeth 5 and pushed up inside.
The lock operating cylinder 6 is formed, and the lock operating cylinder 6 is formed.
Is engaged with the nut cylinder 1, and the lock operation cylinder 6 is elastically biased toward the base end of the nut cylinder 1, and inclined locking teeth 8 for locking the locking teeth 5 are provided side by side on the end surface. A locking tooth tube 10 having an inclined step portion 9 is provided on the lower edge of the peripheral wall, and the locking tooth tube 10 is fitted on the nut tube 1 to lock the locking tooth 8 and the locking tooth 5.
And the locking tooth cylinder 10 are elastically urged toward the tip end side of the nut cylinder 1, the lock operation cylinder 6 is rotated, and the push-up portion 7 slides up the inclined step portion 9 so that The present invention relates to a chuck device characterized in that the locking tooth tube (10) is moved in the axial direction of the nut tube so that both locking teeth (5, 8) in the engaged state are brought into the non-engaged state.

A first member formed by fitting the base cylinder 4 into the nut cylinder 1 in a non-rotating state, a pawl advancing / retreating member 2 screwed to the nut cylinder 1 by a screw, and the pawl advancing / retreating member 2 are continuously provided. It is composed of a plurality of claws 3, a claw holding member 11 that holds the claws 3, and a rotating cylinder 12 that is fitted to the claw holding member 11. The claw advancing and retracting member 2, the claw 3, the claw holding member 11, and the rotating cylinder. 12 and a second member configured to rotate together as a unit, and a rotating cylinder.
In a chuck device that expands / contracts the claw 3 by rotating the claw 12, a position between the claw holding member 11 and the base cylinder 4 appears on the outer periphery of the nut cylinder 1 on the proximal side in the axial direction of the nut cylinder 1. The lock operating cylinder 6 is provided in parallel, and the lock operating cylinder 6 is fitted to the outer peripheral position of the locking tooth 5 and has the push-up portion 7 formed therein. When the lock operation cylinder 6 is fitted, the lock operation cylinder 6 is elastically biased toward the proximal end of the nut cylinder 1, and inclined locking teeth 8 for locking the locking teeth 5 are arranged in parallel on the end face and an inclined step is formed at the lower edge of the peripheral wall. The locking tooth tube 10 having the portion 9 is provided, and the locking tooth tube 10 is attached to the nut tube 1.
And the locking teeth 8 and the locking teeth 5 are opposed to each other and the locking tooth cylinder 10 is elastically biased toward the tip end side of the nut cylinder 1, and the lock operation cylinder 6 is rotated and pushed up. As the part 7 slides up and down the inclined step part 9, the locking tooth tube 10 is moved in the axial direction of the nut tube so that both the locking teeth 5 and 8 in the engaged state are disengaged. And the rotation direction of the lock operation cylinder 6 when the locking teeth 6 and 8 are engaged by the rotation of the lock operation cylinder 6 is the same as the rotation direction of the rotation cylinder 12 that causes the pawl 3 to contract and advance. The present invention relates to a chuck device characterized in that

[0017]

When the main body is mounted on the main shaft of the cutting machine and the rotary cylinder 12 is rotated, the claw 3 also expands / retracts while rotating together with the rotary cylinder 12. A tool is attached to the plurality of claws 3 that move forward and backward, and the tool is gripped by the claws 3.

Finally, the locking teeth 5 and the locking teeth 8 are engaged with each other to complete the mounting of the tool. In this locked state, since the locking teeth 5 and the locking teeth 8 are inclined, for example, when the load in the normal direction is clicked, the rotation cylinder 12 rotates and the claw 3 contracts. Move forward and clamp the tool.

In this locked state, of course, the rotating cylinder 12 cannot be rotated, that is, the claw 3 cannot be expanded and retracted, and the gripping force of the claw 3 with respect to the tool cannot be relaxed against the load in the reverse rotation direction. Absent.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the present invention.
This will be described below.

The first member is composed of a nut cylinder 1 and a base cylinder 4, and the second member is composed of a claw advancing and retracting member 2, a claw holding member 11, a claw 3 and a rotating cylinder 12. Therefore, the first member and the second member are relatively rotatable, and when the second member is fixed and the first member, that is, the base cylinder 4 is rotated, the nut cylinder 1 is rotated, and the pawl advancing and retracting member 2 is rotated. Does not rotate and is screwed in and out, and the claw 3 moves back and forth. Further, when the first member is fixed and the second member, that is, the rotating cylinder 12 is rotated, the nut cylinder 1 does not rotate, the pawl advancing / retreating member 2 pivots and is screwed in and out, and the pawl 3 pivots. Scale back and forth. The claw advancing / retreating member 2 is screwed onto the nut cylinder 1. This screwing is a screwing with a left screw. A flange 13 is provided at the tip of the claw advancing / retracting member 2, and locking grooves 14 for locking the claw 3 are formed at three points of the flange 13.

A claw holding member 11 having a tapered cylindrical tip is fitted on the claw advancing / retreating member 2. Split grooves 15 are formed at three positions of the tapered portion of the claw holding member 11.

The claw 3 is fitted in each of the split grooves 15, and the base of the claw 3 is locked in the locking groove 14 of the claw advancing / retracting member 2.
Reference numeral 3a is a locking portion that locks with the step portion 15a of the split groove 15, and 3b is a locking portion that locks with the step portion 14b of the locking groove 14.

Therefore, the pawl 3 moves forward / backward with the engaging portions 3a and 3b as guides.

The claw holding member 11 is slidably fitted on the outer side of the collar portion 13, a holding ring member 16 is fitted on the outer side of the nut cylinder 1, and a rotary cylinder is fitted on the outer side of the claw holding member 11. 12 is fitted, and the rotating cylinder 12 and the retaining ring member 16 are screwed together.

The holding ring member 16 and the claw holding member 11 are integrated by screws or the like.

Reference numeral 20 is a steel ball for reducing the friction between the nut cylinder 1 and the holding ring member 16, and 22 is a hook spanner engaging portion.

One end of the retaining ring member 16 on the proximal end side of the nut cylinder is vertical, and the other end is a locking tooth 5 inclined clockwise.
(Saw blade teeth) are arranged side by side in a radial state.

The first member fitted on the nut cylinder 1 is the lock operation cylinder 6. The lock operation cylinder 6 has a T-shaped vertical cross-section with a peripheral flange 6a protruding from the inner peripheral edge thereof.
On the side surface of the nut cylinder base end, three protrusions as push-up portions 7 are formed at equal intervals. This lock operation tube 6
The conical flange 6a is fitted onto the nut cylinder 1, and the side surface of the tip end of the nut cylinder of the peripheral collar 6a is flat spring 16a outside the portion where the locking teeth 5 are juxtaposed.
Placed via 17. The disc operation spring 17 presses the lock operation cylinder 6 toward the base end side of the nut cylinder 1, and thus the position of the protrusion with respect to the inclined step portion 9 is appropriately held.

The lock operating cylinder 6 has a horizontal T-shaped cross section and is arranged with its tip fitted on the retaining ring member 16. It also works to prevent foreign matter from entering.

The second member fitted in the nut cylinder 1 is the locking tooth cylinder 10. The locking tooth tube 10 is composed of a small diameter portion 10a and a large diameter portion 10b. One end of the large diameter portion 10b that engages with the locking tooth 5 is vertical and the other surface is counterclockwise. Sloped locking teeth 8 (saw-toothed teeth) are arranged side by side in a radial state, and step portions 10c are formed on the outer sides of the locking teeth 8. The step portions 10c are inclined at three positions at equal intervals. A step portion 9 is formed. This locking tooth tube 10 is locked against the nut tube 1 by a key 18 formed on the nut tube 1 so as to prevent it from rotating.
The nut cylinder 1 is fitted by being pressed toward the tip end side of the nut cylinder 1. By the pressing by the coil spring 23, the position of the protrusion with respect to the inclined step portion 9 is held and the engagement between the locking teeth 5 and 8 is ensured. A key 18 is provided on the inner edge of the locking tooth tube 10.
A recessed groove 25 that fits with is formed.

Reference numerals 9a and 9b are recesses for holding the positions of the protrusions 7.

The third member fitted on the nut cylinder 1 is the base cylinder 4. The base cylinder 4 is fitted into the nut cylinder 1 by the key 18 in a non-rotating state. This base cylinder 4
Is fitted in such a manner that the lower edge of the tip end side of the nut cylinder abuts the protrusion of the lock operation cylinder 6. At the lower edge of the base cylinder 4 on the tip end side of the nut cylinder, three notches 24 corresponding to the inclined step portion 9 of the locking tooth cylinder 10 are formed at equal intervals.
The rotation of is restricted by the notch 24. This notch 24
A locking recess 24a is formed at one end of the locking recess 24a, and the projection of the lock operating cylinder 6 is fitted into the locking recess 24a to ensure a locked state (see FIG. 5).

A concave groove 19 for fitting with the key 18 is formed on the inner edge of the base cylinder 4.

Reference numeral 21 is a snap ring for fixing the base cylinder 4 to the nut cylinder 1.

The operation of the chuck device constructed as described above is as follows.

After gripping the base cylinder 4 and mounting the chuck device on the main shaft of the machine tool, the rotary cylinder 12 is rotated to retreat the claws 3 in an enlarged manner, and the tool is arranged between the claws 3. The rotary cylinder 12 is reversely rotated with one hand, the pawl 3 is contracted and advanced to clamp the tool, and the lock operation cylinder 6 is rotated with that hand to be in a locked state.

That is, when the lock operation cylinder 6 is rotated and the projection slides down the inclined step portion 9, the locking tooth cylinder 10 moves to the tip end side of the nut cylinder 1 and the non-engaged state (see FIG. The locking teeth 5 and the locking teeth 8 in (B) are engaged with each other to be locked (see FIG. 5A). When the lock operation cylinder 6 is rotated in the reverse direction and the projection slides up the inclined step portion 9 against the spring force of the coil spring 23, both locking teeth 5 and 8 are disengaged.

In this locked state, for example, tapping is performed. Since the nut cylinder 1 and the pawl advancing / retreating member 2 of the present embodiment are screwed by the left screw, a case of creating a right screw will be described below. However, the nut cylinder 1 and the pawl advancing / retreating member 2 are the right screw. If it is screwed by, only the opposite relation to the following will be obtained.

During normal rotation cutting work, that is, when descending, even if a load is applied in the normal direction, the engaging teeth 5 and 8 which are engaged rotate with a clicking sound. The rotation of the cylinder 12 provides a self-tightening action.

After the descending cutting is completed, the spindle is reversed in the ascending cutting. At this time, the engaging teeth 5 and the engaging teeth 8 are engaged.
Is a plurality, and since one ratchet tooth and one ratchet pawl are not engaged as in the conventional example, even if a strong cutting load is applied in the reverse direction, the pawl 3 does not loosen, and the tool It will not be dropped.

Further, in the case of the present embodiment, the turning cylinder 12 and the lock operating cylinder 6 can be rotated with one hand when the tool is mounted, and the rotating directions of the rotating cylinder 12 and the lock operating cylinder 6 are the same. Therefore, workability is very good in this respect.

That is, unless the structure for engaging and disengaging the locking teeth 5 and the locking teeth 8 by rotating the lock operation cylinder 6 as in the present embodiment is adopted, There is no choice but to adopt a configuration in which the tooth barrel 10 (actually, the lock operation barrel 6) is manually moved in the axial direction of the nut barrel.

However, with this construction, the work is actually the work of lifting the locking tooth barrel 10 (lock operation barrel 6) by hand and rotating the rotary barrel 12 with another hand. Considering that, in reality, it is necessary to hold a tool in reality, the work must be very complicated. Further, in the case of this configuration, it is troublesome to make the locking teeth 8 and the locking teeth 8 disengaged. This is because when the locking teeth 5 and the locking teeth 8 are engaged with each other, they often come into a biting state, and the locking tooth tube is to separate the two in the biting state. This is because a considerable force is required to move the 10 (lock operation cylinder 6) in the axial direction of the nut cylinder.

In this respect, this embodiment does not have a structure in which the lock operating cylinder 6 is moved in the axial direction of the nut cylinder, but the locking tooth cylinder 10 is moved in the axial direction of the nut cylinder by rotating the lock operating cylinder 6. Since the locking teeth 5 and the locking teeth 8 are engaged and disengaged, the force required for moving the lock operation cylinder 6 in the axial direction of the nut cylinder is not required (the lock operation cylinder 6).
It is also possible to rotate the lock operation cylinder 6 with the same hand after the rotation of the rotation cylinder 12 is performed.
Can be engaged and disengaged with the locking tooth 8, and the rotation cylinder 12,
Since the rotation directions of the lock operation tube 6 are the same, the workability is very good.

[0046]

Since the present invention is configured as described above, it can sufficiently withstand a large load in the reverse direction, and therefore the chuck does not loosen the gripping force of the claw against the tool even when a large load in the reverse direction is applied. It becomes a device.

[Brief description of drawings]

FIG. 1 is a front view of the present embodiment.

FIG. 2 is a sectional view of the present embodiment.

FIG. 3 is an exploded perspective view of the present embodiment.

FIG. 4 is an exploded perspective view of a main part of this embodiment.

FIG. 5 is an operation explanatory diagram of the present embodiment.

[Explanation of symbols]

 1 nut cylinder 2 claw advancing / retracting member 3 claw 4 base cylinder 5 locking tooth 6 lock operating cylinder 7 push-up part 8 locking tooth 9 tilt step 10 locking tooth tube 11 claw holding member 12 rotating cylinder

Claims (4)

[Claims] 1. A first member formed by fitting a base cylinder to a nut cylinder in a non-rotating state, a pawl advancing / retracting member screwed to the nut cylinder by a screw, and a plurality of pawls connected to the pawl advancing / retreating member. And a claw holding member for holding the claw and a rotary cylinder fitted on the claw holding member. The claw advancing and retracting member, the claw, the claw holding member and the rotary cylinder are integrally rotated. In a chuck device configured by a second member configured to move a rotating cylinder to expand and contract a retracting claw, a nut cylinder is provided on the outer periphery of the nut cylinder at a position between the claw holding member and the base cylinder. The inclined locking teeth appearing on the axially proximal end side of the locking teeth are arranged side by side, and the lock operating cylinder to be fitted to the outer peripheral position of the locking teeth is provided, and the lock operating cylinder is fitted to the nut cylinder. The lock operation cylinder is elastically biased toward the base end of the nut cylinder, and is tilted to engage with the engaging teeth. A locking toothed tube in which the locking toothing is arranged side by side on the end face, and the locking toothed tube is fitted on the nut tube so that the locking toothing and the locking toothing are opposed to each other. The chuck device is characterized in that the spring is biased toward the tip side of the nut cylinder. 2. A first member formed by fitting a base cylinder to a nut cylinder in a non-rotating state, a pawl advancing / retracting member screwed to the nut cylinder by a screw, and a plurality of pawls connected to the pawl advancing / retreating member. And a claw holding member for holding the claw and a rotary cylinder fitted on the claw holding member. The claw advancing and retracting member, the claw, the claw holding member and the rotary cylinder are integrally rotated. In a chuck device configured by a second member configured to move a rotating cylinder to expand and contract a retracting claw, a nut cylinder is provided on the outer periphery of the nut cylinder at a position between the claw holding member and the base cylinder. The locking operation cylinder is provided in parallel on the base end side in the axial direction of the, and a lock operating cylinder fitted with an outer peripheral position of the locking tooth and having a push-up portion is provided. While being fitted into the cylinder, the lock operation cylinder is elastically urged toward the base end of the nut cylinder. A locking toothed tube is provided in which inclined locking teeth for locking the locking tooth are arranged side by side on the end surface and an inclined step portion is formed on the lower edge of the peripheral wall, and the locking toothed tube is fitted to the nut tube. The locking tooth and the locking tooth are provided in a pair, and the locking tooth tube is elastically biased toward the tip end side of the nut tube, and the lock operation tube is rotated to push up the uphill portion to slide on the inclined step portion. By doing so, the locking tooth tube is moved in the axial direction of the nut tube, and both engaging teeth in the engaged state are disengaged from each other. 3. A first member formed by fitting a base cylinder to a nut cylinder in a non-rotating state, a pawl advancing / retreating member screwed to the nut cylinder by a screw, and a plurality of pawls connected to the pawl advancing / retreating member. And a claw holding member for holding the claw and a rotary cylinder fitted on the claw holding member. The claw advancing and retracting member, the claw, the claw holding member and the rotary cylinder are integrally rotated. In a chuck device dedicated to tapping, which is composed of a second member configured to move the rotating cylinder and expands and contracts the claws by rotating the rotating cylinder, a nut cylinder of the nut cylinder is provided at a position between the claw holding member and the base cylinder. On the outer circumference, slanted locking teeth that appear on the axial direction base end side of the nut cylinder are arranged in parallel, and a lock operation cylinder that is fitted to the outer peripheral position of this locking tooth and has a push-up portion inside is provided. Fit the operation tube onto the nut tube and snap the lock operation tube toward the proximal end of the nut tube. A locking toothed tube is provided in which inclined locking teeth that are biased by pressure and are locked to the locking tooth are juxtaposed on the end surface, and an inclined step is formed at the lower edge of the peripheral wall. The locking tooth and the locking tooth so as to be opposed to each other, and the locking tooth tube is elastically biased toward the tip end side of the nut tube, and the lock operating tube is rotated to push up the push-up portion to the inclined step. A chuck device characterized in that the locking tooth tube is moved in the axial direction of the nut tube by sliding up and down the portion so that both locking teeth in the engaged state are brought into the disengaged state. 4. A first member formed by fitting a base cylinder to a nut cylinder in a non-rotating state, a pawl advancing / retreating member screwed to the nut cylinder by a screw, and a plurality of pawls connected to the pawl advancing / retreating member. And a claw holding member for holding the claw and a rotary cylinder fitted on the claw holding member. The claw advancing and retracting member, the claw, the claw holding member and the rotary cylinder are integrally rotated. In a chuck device configured by a second member configured to move a rotating cylinder to expand and contract a retracting claw, a nut cylinder is provided on the outer periphery of the nut cylinder at a position between the claw holding member and the base cylinder. The locking operation cylinder is provided in parallel on the base end side in the axial direction of the, and a lock operating cylinder fitted with an outer peripheral position of the locking tooth and having a push-up portion is provided. While being fitted into the cylinder, the lock operation cylinder is elastically urged toward the base end of the nut cylinder. A locking toothed tube is provided in which inclined locking teeth for locking the locking tooth are arranged side by side on the end surface and an inclined step portion is formed on the lower edge of the peripheral wall, and the locking toothed tube is fitted to the nut tube. The locking tooth and the locking tooth are provided in a pair, and the locking tooth tube is elastically biased toward the tip end side of the nut tube, and the lock operation tube is rotated to push up the uphill portion to slide on the inclined step portion. By doing so, the locking tooth tube is moved in the axial direction of the nut tube so that both locking teeth in the engaged state are brought into the non-engaged state. A chuck device, wherein a rotation direction of a lock operation cylinder at the time of engagement is set to be the same as a rotation direction of a rotation cylinder for reducing and advancing a claw.