JPH0650716U - Electric chuck drill chuck - Google Patents

Abstract

(57) [Summary] [Purpose] At the same time as drilling a hole for a screw, form a recess around the hole where the head of the screw abuts. [Structure] A chuck 4 that chucks a drill 5, a claw 3 into which the chuck 4 is inserted, and a rotating ring 2 that is rotated to chuck and release the chuck 4 constitute a drill chuck 1. Attach 1 to the electric drill. A tip-shaped cutting tip 14 is formed at the tip portion of the chuck 4, and at the same time when the drill 5 is used for drilling,
The recess formed by the cutting tip 14 is chamfered on the workpiece.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drill chuck for attaching / detaching a drill used for drilling work to / from an electric drill, and more particularly to a drill chuck capable of simultaneously forming a hole and a chamfer on a workpiece.

[0002]

[Prior art]

 FIG. 5 shows a drill chuck of an electric drill that has been conventionally used. This drill chuck includes a rotating ring 51 that is detachably mounted on the output end side of an electric drill, and a claw 52 that is coaxially provided at the tip of the rotating ring 51. A chuck 53 is provided in the claw 52. It is provided. The chucks 53 are evenly distributed in the same circumference, and the drill 54 is chucked by approaching and separating from each other by rotating the rotating ring 51. Then, when the motor in the electric drill is driven in this chucking state, the chuck 53 and the drill 54 are integrally rotated at high speed to carry out drilling.

[0003]

[Problems to be solved by the device]

 Since this conventional drill chuck is used only for chucking the drill, it has the following disadvantages. FIG. 6 shows a state in which a conventional drill chuck is used to perforate a workpiece 57 such as a building material or a wall with a predetermined hole. When the screw 60, such as a wood screw, is screwed into the workpiece 57 after this drilling, the head portion 61 of the screw is formed in a dish shape, so that the head portion 61 and the end surface of the workpiece 61 fit together. Therefore, it is not possible to screw in the head of the screw, and the head 61 is likely to protrude from the workpiece 57. For this reason, conventionally, after drilling, it is necessary to form a dish-shaped recess 58 matching the head of the screw 60 around the hole, that is, so-called chamfering, which is a troublesome work for forming the recess 58. Was becoming.

The present invention has been made in consideration of the above circumstances, and in addition to chucking a drill for drilling, it is possible to simultaneously form a dish-shaped recess (chamfer) on a workpiece. The purpose is to provide a drill chuck that can be used.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is characterized in that a tip-shaped cutting tip is provided at a tip portion of a chuck for detachably chucking a drill inserted in a claw.

[0006]

[Action]

 In the above structure, when the chuck is rotated while chucking the drill, drilling is performed and the cutting tip at the tip of the chuck forms a peripheral portion and a recess of the workpiece. Therefore, it is not necessary to form the concave portion when the screw is screwed into the workpiece.

[0007]

【Example】

 1 to 4 show an embodiment of the present invention. In FIGS. 1 and 2, a rotary chuck 2, a claw 3 and a chuck 4 constitute a drill chuck 1. The rotary ring 2 is detachably attached to the output end side of an electric drill (not shown). The rotating ring 2 rotates relative to the claw 3, and this rotation causes the chuck 4 to move in and out due to axial movement, and chuck and chuck the drill 5. In order to perform such rotation, a gear surface 6 with which a bevel gear (not shown) of a chuck handle meshes is formed on the front side of the rotary ring 2.

The claw 3 is coaxially provided at the tip of the rotary ring 2. The claw 3 is formed in a tubular shape, and a plurality of chucks 4 (three in the illustrated example) are inserted therein. Reference numeral 7 is a shaft hole formed on the outer surface of the claw 3 into which the gear shaft of the chuck handle for rotating the rotary ring 2 enters. The chuck 4 is inserted so as to penetrate through the claw 3. A plurality of the chucks 4 are inserted into the claw 3 so as to be provided at equal positions on the circumference.

FIG. 3 is a perspective view of the chuck 4, in which an engaging portion 11 and a taper portion 12 are coaxially and integrally formed. The engaging portion 11 is located inside the rotating ring 2, and a rack 13 is formed on the back of the engaging portion 11 by cutting. A ring-shaped pinion (not shown) provided in the rotary ring 2 is engaged with the rack 13, and when the pinion is integrally rotated by the rotation of the rotary ring 2, this rotary motion is converted into a linear motion. . As a result, the chuck 4 is moved in the axial direction, and the tip portion of the chuck 4 is projected and retracted. Then, when the chuck 4 advances from the claw 3, the chuck 5 is in the chucking state, while when the chuck 4 is retracted into the claw 3, the chucking is in the open state. Further, since the interference with other members of the chuck 4 is prevented when the claw 3 is retracted, the chuck 4 can be protected.

The taper portion 12 is inclined outward from the engagement portion 11 to facilitate insertion of the drill 5 into the chuck 4. A cutting tip 14 is formed at the tip of the tapered portion 12. As shown in FIGS. 2 and 3, the cutting tip 14 is formed by cutting the tip portion of each chuck 4 and attaching the cutting tip 14 to this portion by welding with silver wax. The cutting tip 14 is formed with a notch 15 for making the width narrower than that of the chuck 4. Due to the formation of the notch portion 15, the cutting tip 14 has a sharply pointed tip portion and has a shape that gradually widens toward the tapered portion 12, and the edge portions on both sides serve as blade portions. It is made of hard metal that can be hardened. When the chuck 4 rotates while the drill 5 is chucked, the cutting tip 14 acts to cut the workpiece by the rotation. In forming the cutting tip 14, the tip portion including the taper portion 12 of the chuck 4 excluding the rack 13 portion is formed of cemented metal and is welded to the chuck 4 main body by the above means. Is also good. Further, the cutting tip 14 may be formed integrally with the chuck 4.

FIG. 4 shows a state in which the workpiece 20 is punched using the chuck 4. A hole 21 is formed in the workpiece 20 by the drill 5 chucked by the chuck 4, and a dish-shaped recess 22 is simultaneously formed around the hole 2 by the cutting tip 14 of the tip portion of the chuck 4. To be done. When the recess 22 is formed, since the cutouts 15 are formed on both sides of the cutting tip 14, chips are scattered outward from the cutout 15 and adhere to the cutting edge of the cutting tip 4. There is no. Therefore, the recess 22 can be smoothly processed. When a screw 25 such as a wood screw is screwed into such a hole 21, the dish-shaped head 26 abuts against the recess 22, so that the head 26 of the screw 25 protrudes from the surface of the workpiece 20. Disappears. Therefore, it is not necessary to separately form the concave portion 22 after the drilling with the drill 5, and it is possible to perform the drilling quickly. Further, since the chuck 4 has the same structure as the conventional one except that the cutting tip 14 is formed at the tip portion thereof, it can be used as it is in the existing electric drill, and thus has versatility. ing.

[0012]

[Effect of device]

 As described above, according to the present invention, since the pointed cutting tip is formed at the tip portion of the chuck for chucking the drill, the recess for preventing the protrusion of the screw head can be formed simultaneously with the drilling. In addition to having the advantage of not requiring a separate chamfering work, the drilling work can be performed quickly, and the formation of the notch allows efficient drilling work without chips adhering to the cutting tip. I can.

[0013]

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a perspective view of a chuck.

FIG. 4 is a cross-sectional view showing a punched state.

FIG. 5 is a perspective view of a conventional drill chuck.

FIG. 6 is a cross-sectional view showing a conventional punched state.

[Explanation of symbols]

 1 Drill chuck 2 Rotating ring 3 Claw 4 Chuck 14 Cutting tip

Claims (1)

[Scope of utility model registration request] 1. A drill chuck for an electric drill, wherein a tip of a chuck for detachably chucking a drill inserted in a claw is provided with a pointed cutting tip.