JPH1034417A - Drill chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit turning force directly to a drill by providing a groove radially at the lower part surface of a drill chuck so as to connect the drill chuck and a ring to each other in the rotating direction, in correspondence with a protrusion provided at the upper part surface of the ring. SOLUTION: Turning force transmitted from a drill chuck 1 to a drill 7 is transmitted from a claw 2 of the drill chuck and also from a ring 9 through a groove 15 provided at the lower face of a chuck body 3 and a protrusion on the upper face of the ring 9 used as a drill locking means. Since the turning force transmitted from the ring 9 to the drill 7 is not through the claw 2 of the drill chuck 1, extra force in a lateral direction or the like is not applied to the claw 2 so as to prevent lowering of accuracy of gripping a shank 8 of the drill 7. Accurate drilling can thereby be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill chuck for performing efficient machining by preventing slippage between a drill and a drill chuck in drilling using a drill.

[0002]

2. Description of the Related Art Conventionally, in drilling with a drill, the drill is held by the claws of a drill chuck of a drilling machine. Slippage occurs between the shaft and the drill, and the inner surface of the chuck nail or the portion gripped by the shank of the drill is worn and damaged. For this reason, the applicant of the present application has reported the Japanese Utility Model 6-322.
No. 67 discloses a chip removing tool for a drill having a protrusion on a sleeve or a ring to be fixed to a drill, which is inserted into a gap between claws of a drill chuck and interconnects the drill chuck and the sleeve or the ring in a rotational direction. It has been disclosed.

[0003]

SUMMARY OF THE INVENTION
With the chip removing tool of No. 32267, a problem arises when the drill diameter increases. That is, since the claws of the chuck are opened in accordance with the diameter of the drill, when the diameter of the drill is increased, the claws are widely opened and drawn into the drill chuck, so that the drill is gripped inside the drill chuck. Therefore, depending on the shape of the drill chuck, if the tip of the nail is at the same height as the lower surface of the drill chuck, the protrusion for interconnecting with the drill chuck will not be able to insert the projection and the nail will be pulled in. If it does, the upper surface of the sleeve or ring contacts the lower surface of the drill chuck and cannot follow the pawl any more, so that it does not enter between the pawls and the drill chuck and the sleeve or ring cannot be interconnected. Furthermore, with this chip removal tool, a projection is pressed against the side surface of the nail that fixes the drill during rotation to transmit the rotational force, and a force is applied to the nail, so that the drill holding accuracy and the strength of the nail itself are also increased. Problems arise. Also, when the drill cannot be cut or when trying to increase the depth of cut per revolution, the drill gripped by the claw slips and goes into the space inside the drill chuck, changing the drilling depth. . SUMMARY OF THE INVENTION An object of the present invention is to use the chip removing tool for drill or the loosening stopper for drill of Japanese Utility Model Publication No. 6-32267 described above to securely fix the drill to the drill chuck even when the drill has a large diameter and to reduce the rotational force. It is an object of the present invention to provide a drill chuck that can transmit a nail to a drill without difficulty.

[0004]

In order to solve the above-mentioned problems, in the drill chuck of the present invention, a fixing means for fixing a drill loosening stopper or a drill chip removing tool to a through hole through which the drill passes and to the drill is provided. Corresponding to the projections provided on the upper surface of the sleeve or ring, the grooves into which the projections are inserted are formed on the lower surface of the drill chuck so as to interconnect the drill chuck and the sleeve or ring in their rotational directions. It has a configuration provided in the radial direction.

[0005] Further, a drill stopper attached to the tip of the shank of the drill and inserted in the axial direction of the inside of the drill chuck in an axial direction, such that the end of the drill contacts the mounting bar of the drill chuck or the inner surface of the drill chuck. A drill stopper that is fixed and prevents the drill from slipping into the drill chuck during drilling may be included. Further, a groove corresponding to the attachment portion of the drill stopper to the tip of the shank of the drill may be provided in the axial direction of the inner peripheral surface of the drill chuck.

[0006]

According to the above construction, in the drill chuck of the present invention, a drill equipped with a chip removing tool for drilling or a loosening stopper for a drill is mounted on a drill chuck installed on a drilling machine such as a drilling machine via a mounting bar. When drilling is performed, the groove on the lower surface of the drill chuck body and the protrusion of the sleeve or ring are combined, so that the drill chuck and the sleeve or ring are interconnected in the rotation direction, and at the same time, the sleeve or ring is Since it is fixed to the drill, it is possible to avoid such a problem that slippage occurs between the drill chuck and the drill during the drilling.
That is, since the protrusion of the upper surface of the sleeve or ring and the groove of the drill chuck are combined, when the drill chuck tries to rotate in one direction with respect to the drill, the sleeve or ring rotates integrally with the drill chuck. Also, since the sleeve or ring is fixed to the drill by the fixing means, the rotation of the sleeve or ring is reliably transmitted to the drill. Thus, the possibility of slippage between the drill chuck and the drill is significantly reduced, extending the life of the drill and improving the machining efficiency.

Further, when a drill stopper is used for the above-mentioned drill chuck, even if a large pressing load is applied to the drill when the workpiece is hard, the drill cannot be cut, or the drilling diameter is large, the drill is attached to the drill chuck by a ring. Because it is firmly fixed and directly connected to the drill chuck mounting bar by the drill stopper,
The rotating force from the motor is directly transmitted to the drill chuck and transmitted to the drill without the drill slipping into the inside of the drill chuck, so the cut per rotation can be increased,
A large drilling speed and drilling progress can be obtained.

[0008]

FIG. 1 shows a first embodiment of the present invention.
(A) is a side sectional view, and (b) is a transverse sectional view along line AA of (a). Reference numeral 1 denotes a drill chuck for a drilling machine. In a chuck body 3, a three-way claw 2 is formed in the chuck body 3 in the axial direction and through a tooth form of a female screw member 5 and a three-way claw 2 provided therein by the rotation of a cover 4. It moves in the radial direction. As in the prior art, the drill chuck 1 is fitted at its upper opening to a mounting bar 6, and the mounting bar 6 has the other end (not shown) fitted to a mounting portion of a drilling machine. . The drill chuck 1 holds the shank 8 of the drill 7 inside by tightening the three-way claw 2 in the axial and radial directions. A groove 25 is provided on the lower surface of the drill chuck body 3 in the radial direction. The grooves 25 are preferably provided at equal intervals between the claws 2.

In the present invention, in mounting the drill 7, a ring 9 used as a drill loosening stopper penetrating a hole 10 inside the drill is used by being fixed to the drill 7 by a set screw 11. The lower surface of this ring 9 is provided with two claws 12 at the center in a disk shape at its periphery, and these claws 12 enter the two twist grooves of the drill and engage with the bottoms thereof, and serve as a chip removing tool. Also works.
On the upper surface of the ring, three projections 13 are provided on the circumference thereof so as to correspond to the grooves 25 of the drill chuck 1.

In order to attach the drill 7 to the drill chuck 1, first, as shown in FIG. 3, the shank 8 of the drill 7 is inserted into the inside of the Then, the ring 9 of FIG. 1 is fixed to the drill 7 at an appropriate position with the push screw 11. Drill stopper 2
If the zero leg 22 is made elastic, it can tolerate a slight change in the diameter of the drill. The legs 22 are preferably made of a metal such as steel or copper or a plastic elastic member and a spring so as to exhibit elasticity.
Instead of the feet 22, the lower part of the stopper shaft 21 may be constituted by a rod-shaped member made of a material having a magnetic force such as a magnet, and may be attached to the shank 8 of the drill 7 by the magnetic force. The shank 8 of the drill 7 to which the drill stopper 20 and the ring 9 are attached is opened by turning the cover 4 of the drill chuck 1 to open the claw 2 and inserted therein. As shown in FIG. 1, after inserting one end of the stopper shaft 21 of the drill stopper 20 until it comes into contact with the drill mounting bar 6, the cover 4 is turned in the opposite direction to close the claw 2 and fix the drill 7, and at this time, the ring 7 is fixed. 9 is adjusted so that the projection 13 on the 9 fits into the groove 15 provided in the drill chuck body 3, and the mounting is completed. It is desirable that the diameter of the stopper shaft 21 be smaller than the drill diameter so as not to hit the claw 2.

After the drill 7 has been mounted on the drill chuck 1 in this way, the motor is turned on and drilling is performed. At this time, drill chuck 1 to drill 7
The rotational force transmitted to the chuck 9 is transmitted not only from the claw 2 of the drill chuck 1 but also from the ring 9 via the groove 15 provided on the lower surface of the chuck body 3 and the projection 13 of the ring 9. Since the rotational force transmitted from the ring 9 to the drill 7 does not pass through the claw 2 of the drill chuck 1, no extra force is applied to the claw 2 in the lateral direction and the accuracy of gripping the shank 8 of the drill 7 is reduced. Since there is no hole, accurate drilling can be performed. Further, by providing the drill stopper 20, even if a large pressing force is applied to the drill 7, the drill does not slip into the inside of the drill chuck 1, so that the pressing force is reflected on the workpiece as it is to reduce the cutting speed of the drill. It is fast and the drill shank is not loose and scratched.

FIG. 2 shows a second embodiment according to the present invention.
(A) is a side sectional view, and (b) is a transverse sectional view along the line BB of (a). The same reference numerals as those in the first embodiment denote the same components, and a description thereof will not be repeated. In this embodiment, the drill stopper 30 has a stopper shaft 31 and a foot 32 which are separated from each other. The upper portion of the foot 31 is provided with a spring or a gripper having elasticity by a split mold divided in a radial direction. Are gripped and connected.
As can be understood from FIG. 2B, since the size of the foot 31 is larger than the hole of the chuck body 3, a groove 35 on the lower surface of the chuck body 3 is further axially formed on the inner surface thereof. 33 is provided to pass through the groove 33. This embodiment is applicable to a case where a drill having a large diameter is attached, but the shape in which the stopper shaft and the foot are separated from each other is applicable even if the diameter of the drill is not large. When the stopper shaft and foot are separated, a separate recess may be provided in the upper part of the foot, and the stopper shaft may be simply inserted into the recess. Provided and engaged with each other and connected,
Depending on the degree of these engagements, the entire length of the drill stopper may be adjustable. In the case of this separate drill stopper, the entire length can be adjusted by appropriately changing the stopper shafts having different lengths.

When the diameter of the drill is small, the gap between the claws 2 of the chuck 1 is narrowed in order to grip the drill 7, and the gap may be smaller than the diameter of the projection 13 of the ring 9, so that the projection 13 may not enter. To respond to this, drill chuck 1
A groove, a hole, or the like corresponding to the projection 13 may be provided on the lower surface of the claw 2. Further, in the case of a drill chuck such as a keyless chuck, the tip of the nail may be stepped, that is, the other part may be lower than the lower surface of the nail while leaving only the vicinity of the center for gripping the drill. . By doing so, even if the tip of the claw of the drill chuck is at the same height as the lower surface of the chuck body, a space is created by the stepped portion in the radial direction outward, so that the ring projection is inserted into this space. It can be used as a locking device.

[0014]

By using the drill chuck of the present invention, it is possible to directly transmit a rotating force from the drill chuck to the drill, thereby improving the drilling accuracy of the drill and cutting the shank of the drill. Can be prevented and the use period can be prolonged. Further, since the use of the drill stopper can prevent the drill from slipping into the drill chuck, the cutting speed can be increased by processing with a high pressing force. Further, in the drill chuck of the present invention, the force during drilling is transmitted from the drill to the body of the drill chuck, and transmitted from the mounting bar to the drive unit. For this reason, since it is not related to the strength of the claws, it can be used for end milling of a milling machine other than a drill.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a drill chuck according to the present invention, in which (a) is a side cross-sectional view, and (b) is a cross-sectional view taken along line AA of (a).

FIG. 2 is a sectional view of a second embodiment of the drill chuck according to the present invention, wherein (a) is a side sectional view, and (b) is a transverse sectional view taken along the line BB of (a).

FIG. 3 is a perspective view of a drill stopper according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drill chuck 2 Claw 3 Chuck body 4 Cover 5 Female screw 6 Drill chuck attachment bar 7 Drill 8 Shank 9 Ring 10 Hole 11 Push screw 12 Claw 13 Projection 15, 35 Groove 20, 30 Drill stopper 21, 31, Stopper shaft 22, 32 Foot 33 axial groove

Claims (4)

[Claims] 1. A drill chuck for a drilling machine, wherein a drill locking stopper corresponds to a projection provided on an upper surface of a sleeve or a ring having a through hole through which the drill passes and fixing means for fixing the drill. A drill chuck having a lower surface provided with a groove into which the protrusion is inserted in a radial direction for interconnecting the sleeve or ring and the drill chuck in a rotational direction thereof; 2. The drill chuck according to claim 1, wherein the drill chuck is attached to a tip of a shank of the drill and is inserted into an inner space of the drill chuck in an axial direction, and one end of the drill chuck has a mounting bar for the drill chuck. A drill chuck including a drill stopper that comes into contact with the inner surface of the drill chuck and prevents the drill from slipping into the drill chuck during drilling. 3. The drill chuck according to claim 2, wherein the drill stopper has a stopper shaft formed of a cylindrical member having one end contacting the inner surface of the mounting bar or the drill chuck, and the other end of the stopper shaft. A drill attached to the tip of the shank of the drill, and a groove formed in a lower surface of the drill chuck so that the foot passes therethrough, and a groove is further formed in an inner peripheral surface of the drill chuck in an axial direction. Drill drill. 4. The drill chuck is attached to the tip of a shank of a drill and inserted axially into an inner space of a drill chuck of a drilling machine, and one end thereof comes into contact with a mounting bar of the drill chuck or an inner surface of the drill chuck. And a drill stopper for fixing a drill, which prevents the drill from slipping into the drill chuck during drilling.