WO2015166617A1

WO2015166617A1 - Drill chuck

Info

Publication number: WO2015166617A1
Application number: PCT/JP2015/000961
Authority: WO
Inventors: 健吾堀内
Original assignee: 株式会社堀内製作所
Priority date: 2014-04-28
Filing date: 2015-02-25
Publication date: 2015-11-05
Also published as: TW201607649A; JP2015208824A

Abstract

Provided is a drill chuck that allows for reliable and easy mounting and detaching of tools and enables both tool attachment and detachment via a chuck key and tool attachment and detachment by one's bare hands alone. The drill chuck (11) comprises: jaws (31) for holding a tool in the space formed between the jaws, wherein said jaws (31) are mounted on the front part of a drill chuck body (21) so as to be movable to the leading end side and to the machine mounting side (A) relative to the drill chuck body (21) and are configured so that the inner circumferential diameter between the jaws is widened when the jaws are moved to the leading end side or the machine mounting side (A) relative to the drill chuck body (21); a rotary sleeve (41) that is disposed on the outer circumference of the drill chuck body (21) and that moves the jaws (31) by rotating along the outer circumference of the drill chuck body (21); and a bevel gear (42) that is provided on the machine mounting side (A) of the rotary sleeve (41) and that causes the rotary sleeve (41) to rotate when an engaged chuck key (61, 62) is operated.

Description

Drill chuck

The present invention relates to a drill chuck. More specifically, the present invention relates to a drill chuck provided with a bevel gear driven by a chuck key for tightening or releasing a jaw.

A conventional drill chuck 201 whose central partial cross section is shown in FIG. 7 is a standard key type drill chuck, and a set of three jaws 202 is attached to the tip. The jaws 202 are fitted into the drill chuck main body 208 at an angle. Rack gears 203 are provided on the outer surfaces of the jaws 202, respectively. Reference numeral 204 denotes a rotating sleeve, and 205 denotes a split nut.
The split nut 205 is attached to the inside of the rotary sleeve 204. The split nut 205 has a straight outer shape, and has a tapered female screw cut inside. The female screw provided on the split nut 205 is meshed with the male screw provided on the rack gear 203 provided on the jaw 202. The rotation sleeve 204 can be rotated by a chuck key or a bare hand.
The jaw 202 slides and moves by the rotation of the split nut 205 due to the rotation of the rotating sleeve 204, while narrowing the inner peripheral diameter between the three pairs. A driver and tools are held in a space formed between a set of three jaws 202.

In FIG. 7, reference numeral 207 denotes a chuck key connection hole, which is provided from the side surface from the tip of the drill chuck main body 208 toward the center line 225 which is the center side. After rotating the rotary sleeve 204 with bare hands to hold the cutters lightly, the chuck key is inserted into the chuck key connection hole 207. At the same time, the chuck key side bevel gear 206 is engaged with the drill chuck side bevel gear 206 provided on the jaw 202 side of the rotating sleeve 204 to connect the chuck key. Next, the chuck key is rotated to further tighten the rotating sleeve 204. Further tightening of the rotating sleeve 204 provides a holding force that can withstand the work.
Reference numeral 209 denotes a machine attachment portion, and a hole is formed from the machine attachment side (right side in the figure) toward the tip side (left side in the figure). The main spindle of the machine is inserted into the hole.

FIG. 8 shows a state in which the jaw 202 is retracted or retracted to the machine mounting side in the conventional drill chuck 201 shown in FIG.
The jaw 202 is retracted, and the space between the three jaws 202 is formed to form a space portion, and a drill 211 as a tool is sandwiched in the space portion. The tip of the chuck key 210 is connected to the chuck key connection hole 207 and meshes with the chuck key side bevel gear 212 and the drill chuck side bevel gear 206 provided on the side surface of the tip of the chuck key 210.
After the bevel gears are engaged with each other, the chuck key 210 is rotated and the rotating sleeve 204 is rotated, whereby the three jaws 202 further tighten a tool such as the drill 211.

9 and 10 are partial front sectional views of the drill chuck 201 according to the cited document 1 “Drill Chuck”. The drill chuck 201 has the same structure as the drill chuck 201 shown in FIGS.

The conventional drill chuck 201 shown in FIGS. 11 and 12 has the same internal structure as the so-called standard type drill chuck 201 shown in FIGS. 7 to 10, but the rotating sleeve 204, the body holding sleeve 213, etc. This is a so-called keyless drill chuck in which no bevel gear is provided outside the drill chuck 201.
The rotary sleeve 204 is covered as a cover around the split nut 231 fitted to the jaw 202. Reference numeral 213 denotes a main body cover. The split nut 231 and the rack gear 203 of the jaw 202 are engaged with each other.
In the drill chuck 201 shown in FIG. 11 to FIG. 12, the main body holding sleeve 213 and the rotating sleeve 204, which are the outer diameters of the drill chuck main body 208 on the machine main shaft mounting side, are gripped and rotated with only bare hand force to rotate each other. Because the rotation causes the split nut 231 and the rack gear 203 of the jaw 202 to mesh with each other, the jaw 202 moves backward to the machine mounting portion 209 side, and the inner peripheral interval of the set of three jaws 202 is opened.

A drill 211 is inserted into a space formed between a set of three jaws 202. Next, the rotating sleeve 204 is again rotated in the reverse direction and tightened to fix the drill 211.
The drill chuck 201 shown in FIGS. 11 to 13 is attached / detached only with bare hands. Therefore, in order to reduce friction, a washer 214 and a steel ball are provided on the end face of the split nut 231. Further, the holding force is strengthened by reducing the pitch of the rack gear 203, increasing the outer diameter, or making the tool holding portion of the jaw 202 an acute angle.

13 and 14 show a drill chuck 201 which is a keyless drill chuck described in Patent Document 2 as a conventional example. In the keyless drill chuck 201, reference numeral 221 denotes a lifting member. The elevating member 221 moves forward and backward, that is, the front end side and the machine attachment side with respect to the center line 225 in order to hold tools 211 such as a drill and a screwdriver. The jaw 202 holds the tools by narrowing the inner peripheral diameter while moving in the same direction as the movement of the elevating member 221 toward the opening of the jaw 202.

In the keyless drill chuck 201 shown in FIGS. 13 and 14, the tool is sandwiched between the jaws 202 and the taper ring 227 is rotated by a hand to move the elevating member 221 and the jaw 202 to the distal end side. Although the holding force is weak only by tightening by hand, the resistance of the elevating member 221 caused by the resistance transmitted from the tool 211 to the jaw 202 and the torsion of the power transmitted from the machine main shaft 261 or the chuck arbor 215 when the tool comes into contact with the workpiece. By moving toward the tip side, the tool 211 is automatically tightened without using the chuck key.
The drill chuck 201 shown in FIGS. 13 and 14 requires only a small tightening force with bare hands.

Reference numeral 222 denotes a screw screwed on the surface of the elevating member 221, reference numeral 223 denotes a jaw guide, and reference numeral 224 denotes a drill chuck body. When the taper ring 227 is rotated, the elevating member 221 is moved back and forth by the screw 222 of the elevating member 221, and the jaw 202 is moved to the machine side which is the front end side direction on the right side in the figure or the rear end side direction on the left side in the figure. Open and close.
The rotating sleeve 204 is not provided with a bevel gear.
Reference numeral 226 denotes a spanner groove. The spanner groove 226 is provided in the shape of a groove on the surface of the cylindrical portion of the taper ring 227 in parallel with the center line direction. The spanner groove 226 can be hooked with the spanner 251 to rotate the taper ring 227 to move the elevating member 221 and the jaw 202 forward and backward.

In addition, there is known a drill chuck 201 of the type in which a front partial sectional view and a partially enlarged sectional view are shown in FIGS. The chuck chuck 201 shown in FIGS. 15 and 16 is a key type standard type drill chuck, and can be used with a bare hand without using the chuck key 210 or can be connected to the chuck key connection hole 207. This is a type of drill chuck 201 in which tools can be attached and detached even by 210.
As shown in FIG. 16, the

clutch nuts

241 and 242 are configured by providing irregularities inside the split nut 205 and the cover or the rotation sleeve 204, respectively.
Reference numeral 229 denotes a leaf spring. The leaf spring 229 presses the rotary sleeve 204 toward the machine side, that is, the right side in the drawing.

When the tools are tightened without the chuck key 210, the machine main shaft 261 is rotated with the rotary sleeve 204 held with a bare hand. The concave and

convex portions

241 and 242 that are internal clutches cause the rotary sleeve 204 to be idle, and only the rotary sleeve 204 can stop rotating.
At this time, the unevenness 241 provided inside the stopped rotating sleeve 204 is pressed against the unevenness 242 provided on the split nut 205 that continues to rotate by the machine main shaft 261, and the clutch is engaged by an impact that the

unevennesses

241 and 242 collide with each other. You can tighten tools.
The drill chuck 201 shown in FIG. 15 can be replaced with the tool 211 using a chuck key or without a chuck key. It is necessary to give an impact force for engaging the clutch necessary for tightening the tools.

Japanese Utility Model Publication No.59-17526 Japanese Patent Laid-Open No. 10-118813

The drill chuck 201 shown in FIGS. 7 to 10 can obtain an appropriate holding force by rotating and rotating the rotating sleeve 204 using the chuck key 210, and can be used for forward and reverse operations with a simple structure. Yes. However, each time the tool 211 is replaced, an operation of loosening with the chuck key 210 and an operation of tightening are required, which is troublesome.
Even if the rotary sleeve 204 is turned only with a bare hand without using the chuck key 210 and the tool 211 is tightened, the chuck key is a hole for connecting the chuck key 210 to the outer diameter of the jaw side of the drill chuck body 208. There is a connection hole 207. The outer diameter in the vicinity of the chuck key connection hole 207 is smaller than the rotary sleeve 204 by the inner diameter of the drill chuck side bevel gear 206 because the chuck key 210 is attached. In the vicinity of the chuck key connection hole 207, the length is short and there is a step in the diameter, so the drill chuck body 208 cannot be held with bare hands. For this reason, the chuck key 210 is not an unnecessary keyless type, and tightening with the chuck key 210 is required.

A drill chuck 201 shown in FIGS. 11 to 12 holds a main body holding sleeve 213 which is the outer periphery of the drill chuck main body 208 on the machine mounting side with one hand, and rotates the rotating sleeve 204 with the other hand to use tools 211. Loosen and tighten with bare hands. Although the jaw 202 can be opened and closed with only a bare hand, workability is good, but there are many cases where the tightening force is insufficient, and there is a problem that the tool 211 is idle.
11 to 12 cannot be tightened with the chuck key 210 because the bevel gear 206 is not provided even when the tightening force is insufficient. When the rear portion of the blade 211 such as a drill is hard, the biting of the jaw 202 is weak and the holding force is insufficient, so that there is a problem that the tools 211 are likely to be idle.

Further, when the drill chuck 201 shown in FIGS. 11 to 12 is used to some extent, the tool holding portion of the jaw 202 is worn away and appears to be reduced or damaged, the tool holding force is gradually reduced, and the tool 211 is frequently idle. Have problems that occur.
In such a state, the holding force of the tools 211 is insufficient even when tightening with only bare hands. However, retightening with the chuck key 210 is not possible. There is a problem that the life of the drill chuck 201 is shortened because it is not possible to cope with the tightening even if the tools 211 are idle.
Further, since the tightening with the chuck key 210 cannot be performed, there is a problem that it cannot be used for work requiring a large torque.
In order to reduce the idle rotation of the tools 211, there may be a method of making the tool holding portion of the jaw 202 an acute angle or a method of making it in two rows. However, the tools 211 are likely to be damaged by the jaw 202. Has a point. The sharp tool holding part has a problem that it easily wears down and the holding force is quickly reduced.

The drill chuck 201 shown in FIGS. 13 and 14 requires only a small tightening force with bare hands. However, when the wear of the jaw 202 occurs, the biting of the tool holding portion of the jaw 202 is reduced, and the blades 211 rotate before the twist is transmitted to the elevating member 221. In such a state, it is difficult to automatically tighten.
Even when the tool 211 is idle, it cannot be retightened because there is no bevel gear or chuck key. Some taper rings 227 are provided with a wrench groove 226 for using the hook spanner 251. However, if the machine main body cannot be fixed, the entire drill chuck 201 rotates together with the machine spindle 261 and it is difficult to apply a tightening force. It is. When the machine spindle 261 cannot be fixed, there is a problem that two hook spanners 251 must be used and tightened using the machine spindle fixed side and the taper ring 227 side.

In the case of a structure in which the tools 211 are automatically tightened, the power of the machine will automatically be added to the holding force when working with a large amount of torsional stress with the tools, so the tools will be tightened more than necessary. It may be crowded. In this state, there is a problem that the taper ring 227 cannot be loosened and removed by turning the taper ring 227 only with bare hand force.
The lifting member 221 of the drill chuck 201 shown in FIGS. 13 and 14 is usually provided with a left-hand screw, and the rotational direction in which the mechanical spindle 261 and the tools 211 are twisted is tightened in one direction and loosened in the reverse direction. It has become.
Therefore, it is not suitable for work that requires forward rotation and reverse rotation such as a driver or tap work. When reverse rotation is required, a ratchet structure and a lock mechanism are required inside the drill chuck 201, which is complicated and expensive. Furthermore, even such a mechanism cannot be said to be a structure corresponding to retightening with a chuck key or a spanner.

The drill chuck 201 shown in FIGS. 15 and 16 can be exchanged with or without the chuck key 210. However, when the opening / closing operation is performed without the chuck key 210, it is necessary to apply an impact force necessary for tightening the tools 211 to the split nut 205 inside the drill chuck 201.
For this purpose, it is necessary to rotate the machine main shaft 261 while holding the rotary sleeve 204 with bare hands. However, the machine main shaft 261, the chuck body 208, and the jaws are held while the rotary sleeve 204 is idled by the

clutches

241 and 242. 202, the tools 211, the blades such as the drill 211, and the like continue to rotate.
Further, during the time when the tools are tightened by grasping the rotating sleeve 204, there is a great amount of vibration that bumps into the hand. It is difficult to adjust the tightening force according to the tool 211 for tightening with the power of the machine.

In any case, no conventional drill chuck has a bevel gear on the machine mounting side that can be larger in diameter than the jaw mounting side, and the jaw is tightened or released with a chuck key.
The object of the present invention is that in the conventional example, the bevel gear is provided around the tip of the drill chuck near the tip of the jaw, so the diameter of the periphery of the jaw is small, and force is applied to turn the bevel gear by hand. It is an object of the present invention to provide a drill chuck that solves the problems such as no problem and can reliably and easily attach and remove tools.

The drill chuck according to the present invention is:
It is attached to the front part of the drill chuck body so that it can move to the tip side and machine mounting side with respect to the drill chuck body, and the inner diameter between each other by moving to the tip side or machine mounting side with respect to the drill chuck body The jaws that hold the tools in the space between them,
A rotating sleeve that is installed on the outer periphery of the drill chuck body and moves the jaw by rotating along the outer periphery of the drill chuck body;
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Is provided.

Furthermore, the drill chuck according to the present invention is:
It is attached to the front of the drill chuck body so that it can move to the tip side and machine mounting side with respect to the drill chuck body, has a rack gear, and moves to the tip side or machine mounting side with respect to the drill chuck body. A jaw that widens and narrows the inner peripheral diameter between them and holds the tools in the space created between them,
A rotating sleeve, which has a cylindrical shape that can be rotated by a chuck key or a bare hand, is installed on the outer periphery of the drill chuck body, and rotates along the outer periphery of the drill chuck body;
A split nut made of a taper type, provided inside the rotary sleeve, holding the tools by narrowing the inner peripheral diameter while moving the jaw by the rotation of the rotary sleeve,
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Is provided.

Furthermore, the drill chuck according to the present invention is:
A lifting member that moves to the tip side and the machine mounting side with respect to the center line of the drill chuck;
It is attached to the front of the elevating member so that it can move to the tip side and the machine mounting side with respect to the drill chuck body. Jaw that holds the tools in the space created between them by widening and narrowing the inner peripheral diameter between them by moving,
Have
In a keyless type drill chuck that can tighten tools without using a chuck key due to the movement of the lifting member due to the resistance transmitted to the jaw from the tools and the torsion of the power transmitted from the machine spindle,
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Is provided.

According to the present invention, since it is a drill chuck that can easily and quickly tighten tools such as a screwdriver and blades such as a drill by simply turning the rotating sleeve with a bare hand without a chuck handle, it has a bevel gear. When strong tightening or forward / reverse rotation is required, additional tightening with a chuck key is possible. Both tools can be attached / detached with the chuck key and only with bare hands.
Even if the drill chuck is too tight and does not loosen with bare hands, and the tools cannot be removed, it is possible to reverse the rotation with the chuck key and simply loosen the rotating sleeve.
Tool replacement is safe because it can be done while the machine is stopped.
Even when the holding force of the jaw holding part of the jaw is reduced due to wear, additional tightening with the chuck key can be performed, so that the life of the drill chuck can be extended.

Conventionally, since the bevel gear is provided around the tip of the drill chuck near the tip of the jaw, the diameter of the periphery of the jaw is small and no force is applied to turn the bevel gear by hand. However, according to the present invention, the bevel gear is provided on the machine mounting side of the rotating sleeve, and the rotating sleeve is rotated by the operation of the meshed chuck key. Easy to grip with hands.
According to the present invention, a drill chuck capable of attaching and detaching tools reliably and easily is provided.

It is an assembly drawing of the 1st example concerning an embodiment of this invention. It is a front fragmentary sectional view of the 1st example concerning an embodiment of this invention. It is a front fragmentary sectional view of the 1st example concerning an embodiment of this invention. It is a front fragmentary sectional view of 2nd Example which concerns on embodiment of this invention. It is a front view of the chuck key concerning an embodiment of this invention. It is a front view of the chuck key concerning an embodiment of this invention. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example. It is a front fragmentary sectional view of a prior art example.

A first embodiment according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3, 5 and 6 showing an embodiment of the present invention.

11 is a drill chuck. The drill chuck 11 shown in FIG. 1 is an embodiment based on a so-called standard drill chuck.
21 is a drill chuck body. The drill chuck main body 21 is provided with irregularities on the surface, but is composed of a substantially cylindrical metal rod as a whole. 22 is a ridge, and is formed in a convex shape from the adjacent small diameter portion 27 in the middle portion of the drill chuck main body 21. Reference numeral 23 denotes an outer periphery of the drill chuck body.
Reference numeral 24 denotes a chuck key connection hole. A plurality of chuck key connection holes 24 are formed in the periphery of the end portion of the drill chuck main body 21 near the machine mounting side A, three in this embodiment, and are formed from the outer periphery toward the center. Reference numeral 25 denotes a jaw mounting hole. The jaw mounting hole 25 is provided at the tip of the drill chuck body 21 in three equal parts toward the machine mounting side A.

31 is Joe. The jaw 31 has a substantially rod shape, and is attached to the front portion of the drill chuck body 21 so as to be movable on the tip side C and the machine mounting side A with respect to the drill chuck body 21 in a set of three.
The jaw 31 mounted in the jaw mounting hole 25 moves so that the tool holding portion B inside the tip of the jaw 31 can adjust the circumferential diameter with the central axis direction of the drill chuck body 21 as the origin.
The jaws 31 move to the tip end side C or the machine mounting side A with respect to the drill chuck main body 21 to widen or narrow the inner peripheral diameter between them, and hold the tool T in the space portion formed between them.

32 is a rack gear. The rack gear 32 is provided on the rear side from the middle of the outer surface of the jaw 31.
Reference numeral 41 denotes a rotating sleeve. The rotating sleeve 41 has a cylindrical shape. The rotating sleeve 41 is installed on the outer periphery of the drill chuck main body 21 and is rotated along the outer periphery of the drill chuck main body 21 by

chuck keys

61 and 62 or a bare hand. The chuck key comprises a T-shaped chuck key 61 as shown in FIG. 5 or an L-shaped chuck key 62 as shown in FIG.
The jaw 31 is moved by rotation of the tapered

split nuts

55a and 55b provided inside the rotary sleeve 41 that can be rotated by the

chuck keys

61 and 62 or a bare hand, while narrowing the inner peripheral diameter, and a knife such as a screwdriver or a drill. Etc. are held by the tool holding part B.

42 is a bevel gear. The bevel gear 42 is provided at the end A of the rotating sleeve 41 on the machine mounting side of the cylinder. The bevel gear 42 rotates the rotating sleeve 41 by operating the

chuck keys

61 and 62 to be engaged with each other, and tightens the jaw 31 for opening / closing and tightening the jaw 31.

Reference numeral 51 denotes a main body cover. The diameter of the main body cover 51 is the same as that of the rotating sleeve 41, the tip is open, and the opening 51 a is fitted to the outer periphery 23 of the drill chuck main body 21 to D of the drill chuck main body 21.
52 is a thrust bearing. The thrust bearing 52 has a donut shape and is fitted into the small diameter portion 27 between the flange 22 and the outer periphery 23 of the drill chuck main body 21.
53 is a steel ball embedded in the thrust bearing. Reference numeral 54 denotes a cage, which is made of resin and has a steel ball 53 embedded therein.
55a and 55b are split nuts, and 56 is a washer.
The

split nuts

55a and 55b have a taper type inner diameter screw, and are provided inside the rotary sleeve 41. While the jaw 31 is moved by the rotation of the rotary sleeve 41, the inner peripheral diameter is narrowed and the tools T are held.
Reference numeral 71 denotes a connection shank. The connection shank 71 is attached to the machine attachment side A end of the drill chuck body 21, and the machine side is attached to the processing machine.

Next, assembly of the drill chuck 11 will be described with reference to FIGS.
For attachment to the drill chuck body 21, the jaw 31 is inserted into the jaw mounting hole 25 from the distal end side C, and the washer 56 and the holder 54 are inserted in this order. Further, the split nut 55a and the split nut 55b are fitted to the small diameter portion 27 between the flange 22 and the outer periphery 23 of the drill chuck body 21 from both sides, and the portion where the rack gear 32 of the jaw 31 protrudes from the small diameter portion 27 is divided into the split nut 55a and The split nut 55b is sandwiched from both sides and combined into a ring shape.
The thrust ball 52 is connected in advance by a cage 54 made of resin.

The outer diameters of the split nuts 55a and 55b are fixed by press-fitting the rotary sleeve 41 from the machine mounting side A of the drill chuck body 21 with a press.
As shown in FIG. 1, the rotating sleeve 41 may be formed by integral molding or by combining two parts made of the same cylinder as the bevel gear 42. Finally, a body cover 51 for making the drill chuck body 21 easy to grip is press-fitted.

In this state, the screw on the machine mounting side A of the drill chuck 11 is connected to a tool T such as a machine or an electric tool.
Alternatively, the drill chuck 11 attaches and detaches the hexagonal shaft portion to a machine such as an electric tool with the connection shank 71 attached.

For exchanging the tool T such as a drill or a screwdriver, the rotary sleeve 41 is rotated while holding the main body cover 51, the tool T is inserted into the tool holding part B of the jaw 31 at a circumferential interval, and the rotary sleeve 41 is again inserted. Is rotated in reverse to fix the drill T.
If the cutting resistance is low, it is only necessary to tighten it with bare hands. However, if the cutting resistance is large or the tool holding portion B of the jaw 31 is worn away and the holding force is weakened, the

chuck keys

61 and 62 are pressed. It is inserted into the chuck key connection hole 24 of the drill chuck body 21, meshed with the bevel gear 42 of the rotating sleeve 41, and rotated and tightened.

As for the shape of the chuck key, the L-shaped chuck key 62 without one side is less likely to interfere with the attached electric tool or machine than the T-shaped chuck key 61.
In this embodiment, the tool T can be attached / detached by the

chuck keys

61 and 62 and attached / detached only by bare hands.

A second embodiment according to another embodiment of the present invention will be described with reference to FIGS. 4 to 6 showing an embodiment of the present invention.
The second embodiment is a keyless drill chuck based on Japanese Patent Laid-Open No. 10-118813 “Keyless Drill Chuck” according to Cited Document 2. That is, in the second embodiment, the elevating member 81 is provided, and the

chuck keys

61 and 62 are not used due to the movement of the elevating member 81 due to the resistance transmitted from the tools T to the jaw 31 and the twist of the power transmitted from the connecting shank 71. This is a keyless type drill chuck 11 capable of tightening the tool T.
The second embodiment is common to the drill chuck described in the cited document 2 except that a bevel gear 42 is provided at the machine mounting side A end of the rotating sleeve 41.

The elevating member 81 moves in the front-rear direction, that is, the front end side C and the machine attachment side A along the drill chuck center line L in order to hold tools T such as a drill and a screwdriver.
This will be described in detail below.
43 is a taper ring. The taper ring 43 has a truncated cone shape. A female screw 43 a is provided on the machine mounting side A of the inner periphery of the taper ring 43. A jaw guide 91 is mounted inside the taper ring 43, and the jaw 31 is inserted into the jaw guide groove 92 of the jaw guide 91.
44 is a grip ring. The grip ring 44 has an outer diameter substantially the same as that of the rotary sleeve 41 and is connected to the drill chuck body 21 from the machine mounting side A.

The rotating sleeve 41 has a cylindrical shape, and a male screw 41a is provided on the outer periphery of the distal end side C.
The rotating sleeve 41 and the taper ring 43 are connected by engaging the male screw 41a provided on the outer periphery of the distal end C of the rotating sleeve 41 with the female screw 43a provided on the inner periphery of the taper ring 43 on the machine mounting side A. Is installed on the outer periphery of the drill chuck main body 21 and moves the jaw 31 by rotating along the outer periphery.
A steel ball 53 and a washer 56 are attached between the rotary sleeve 41 and the drill chuck body 21.

A bevel gear 42 is provided at the machine attachment side A end which is the machine attachment side A of the rotating sleeve 41. The rotating sleeve 41 rotates the rotating sleeve 41 by operating the

chuck keys

61 and 62 to be engaged with each other.
The drill chuck main body 21 is provided with a chuck key connection hole 24 which is a hole for connecting the

chuck keys

61 and 62.

The drill chuck main body 21 is continuously provided with through holes of a connecting inner diameter 21a and an elevating member inner diameter 21b from the machine mounting side A to the tip side C.
The connecting inner diameter 21a is provided at the center of the drill chuck body 21 from the machine mounting side A of the drill chuck body 21 toward the tip side C. The elevating member inner diameter 21b is provided on the distal end side C of the connecting inner diameter 21a. Female threads are provided on the inner circumferences of the connecting inner diameter 21a and the lifting member inner diameter 21b. It is good also as a taper-shaped hole matched with the attachment shape of the machine instead of the internal thread.

The elevating member 81 has a substantially cylindrical shape. A male screw 82 is provided on the outer peripheral surface of the elevating member 81.
Reference numeral 26 denotes a female screw. The female screw 26 is provided on the inner periphery of the drill chuck main body 21. A male screw 82 provided on the outer peripheral surface of the elevating member 81 is screwed onto a female screw 26 provided on the inner periphery of the elevating member inner diameter 21b of the drill chuck body 21 and attached. The tip end side C of the elevating member 81 is formed of a cylindrical opening end and is provided with a jaw attachment portion 83.
91 is a jaw guide and 92 is a jaw guide groove. The jaw guide 91 and the jaw guide groove 92 are provided on the inner periphery of the taper ring 43.
In the jaw guide 91, three jaw guide grooves 92 are formed at positions equally divided into three on the circumferential surface. In each jaw guide groove 92, the jaw 31 is disposed so as to be movable back and forth. The jaw 31 is guided by the jaw guide groove 92 and can move forward and backward, that is, from the machine mounting side A to the tip side C, and the jaw 31 is provided on the inner surface of the taper ring 43 as the elevating member 81 moves. It moves while being guided along the groove 92.

The jaw attachment portion 83 of the elevating member 81 has a wall shape along the outer periphery, and three T-shaped grooves (not shown) are formed at positions on the peripheral surface obtained by dividing the attachment portion end peripheral surface into three equal parts. . An L-shaped groove may be used instead of the T-shaped groove. The T-shaped groove is provided with a notch from the machine mounting side A to the tip side C and a portion perpendicular to the notch at the tip side C of the notch to form a T-shape as a whole notch. The machine mounting side A which is the rear part of the jaw 31 is connected to the T-shaped groove.
The jaw 31 is attached to the front end side C and the machine attachment side A with respect to the drill chuck main body 21 in a T-shaped groove in the front portion of the elevating member 81.
When the rotating sleeve 41 or the taper ring 43 is rotated, the elevating member 81 moves back and forth due to the screwing of the screw 82 of the elevating member 81 and the female screw 26 of the drill chuck body 21, and the jaw 31 is moved in the distal direction C direction or rearward. Move to machine side A which is the end side direction.

When the elevating member 81 moves back and forth with respect to the center line L, that is, the distal end side C and the machine mounting side A, the jaw 31 moves in the same direction as the elevating member 81 moves in the direction of the opening of the jaw 31. While narrowing the inner peripheral diameter between the jaws 31 and holding the tools T such as a drill and a screwdriver, or moving to the machine mounting side A in the reverse direction, the inner peripheral diameter between the jaws 31 is increased. The holding | maintenance of the tools T in the space part produced in between is weakened.

The drill chuck 11 according to the second embodiment is assembled as follows.
A rotating sleeve 41 provided with a bevel gear 42 is attached via a washer 56 and a steel ball 53 from the rear part of the drill chuck body 21, that is, the machine attachment side A.
Next, the elevating member 81 is screwed into the female screw 26 of the drill chuck body 21 from the tip side C which is the opposite direction, and a jaw guide having a jaw guide groove 92 is further engaged. 91 is inserted between the outside of the drill chuck body 21 and the rotary sleeve 41.
Next, the jaw 31 is attached to a T-shaped groove provided on the distal end side C of the elevating member 81 so as to be movable in the jaw guide 91. Thereafter, the taper ring 43 and the grip ring 44 are attached.

The inner diameter 21a for connection provided in the drill chuck main body 21 of the drill chuck 11 assembled in this way is connected to the connection shank 71, a power tool or a drilling machine.
As the grip ring 44 and the taper ring 43 are twisted with each other, the elevating member 81 moves in and out in the axial direction and slides the jaw 31.
In this embodiment, the jaw 31 is slid along the inner diameter taper of the taper ring 43 to adjust the inner circumferential interval of the tool holding portions B of the three jaws 31.
Further, when attaching the tool T, the grip ring 44 and the taper ring 43 are gripped by hand and rotated with respect to each other, the inner circumferential interval of the jaw 31 is opened, the tool T is inserted therein, and the taper ring 43 is reversed again. Rotate, move the elevating member 81 and the jaw 31 to the machine side A and tighten them to fix the blades T.

Although it is weak just by tightening by hand, it automatically moves without using the

chuck keys

61 and 62 due to the resistance transmitted from the tool T to the jaw 31 and the movement of the elevating member 81 due to the torsion of the power transmitted from the mechanical spindle 72 or the connecting shank 71. Tighten the tools T.
That is, the twist of the jaw 31 is caused by the resistance of the machine main shaft 72 and the tool T. Therefore, the cutting resistance of the tool T such as a drill is automatically tightened by the rotational torque transmitted to the elevating member 81.
When further tightening is required or when the drill chuck is rotated in reverse, the

chuck keys

61 and 62 are inserted into the chuck key connection holes 24 provided in the drill chuck main body 21 and further tightened by the bevel gear 42 provided in the rotary sleeve 41. .

Therefore, in these embodiments, the bevel gear 42 can be used in spite of the drill chuck 11 that can easily and quickly tighten the tools T and the tools such as the drill by simply rotating the rotary sleeve 41 with a bare hand without a chuck handle. When the forward and reverse rotation is necessary with strong tightening or a screwdriver, additional tightening with the

chuck keys

61 and 62 is possible.
Even when the drill chuck 11 is too tight and does not loosen with bare hands, and the tools T cannot be removed, the rotary sleeve 41 and the taper ring 43 can be easily loosened by using the

chuck keys

61 and 62.
The replacement work of the tools T can be performed safely while the machine is stopped.
Even when the holding force of the tool holding portion B of the jaw 31 is reduced due to wear due to use, it is possible to extend the life of the drill chuck 11 because the

chuck keys

61 and 62 can be tightened.

11 Drill Chuck 21 Drill Chuck Body 31 Jaw 41 Rotating Sleeve 42 Bevel Gear 61 Chuck Key 62 Chuck Key 72 Machine Spindle A Machine Mounting Side

Claims

It is attached to the front part of the drill chuck body so that it can move to the tip side and machine mounting side with respect to the drill chuck body, and the inner diameter between each other by moving to the tip side or machine mounting side with respect to the drill chuck body The jaws that hold the tools in the space between them,
A rotating sleeve that is installed on the outer periphery of the drill chuck body and moves the jaw by rotating along the outer periphery of the drill chuck body;
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Drill chuck comprising.
It is attached to the front of the drill chuck body so that it can move to the tip side and machine mounting side with respect to the drill chuck body, has a rack gear, and moves to the tip side or machine mounting side with respect to the drill chuck body. A jaw that widens and narrows the inner peripheral diameter between them and holds the tools in the space created between them,
A rotating sleeve, which has a cylindrical shape that can be rotated by a chuck key or a bare hand, is installed on the outer periphery of the drill chuck body, and rotates along the outer periphery of the drill chuck body;
A split nut made of a taper type, provided inside the rotary sleeve, holding the tools by narrowing the inner peripheral diameter while moving the jaw by the rotation of the rotary sleeve,
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Drill chuck comprising.
A lifting member that moves to the tip side and the machine mounting side with respect to the center line of the drill chuck;
It is attached to the front of the elevating member so that it can move to the tip side and the machine mounting side with respect to the drill chuck body. Jaw that holds the tools in the space created between them by widening and narrowing the inner peripheral diameter between them by moving,
Have
In a keyless type drill chuck that can tighten tools without using a chuck key due to the movement of the lifting member due to the resistance transmitted to the jaw from the tools and the torsion of the power transmitted from the machine spindle,
A bevel gear which is provided on the machine mounting side of the rotating sleeve and rotates the rotating sleeve by operating a chuck key engaged with the rotating sleeve;
Drill chuck comprising.