KR200345384Y1 - Tool bit for keyless drill chuck - Google Patents

Abstract

The present invention is to provide a tool bit for a keyless drill chuck structure that can be quickly and easily replaced by the removal of the various tool bits used for various operations by being attached to the hand drill installed the keyless drill chuck.

To this end, the present invention is a tool bit having a structure that is mounted to the drill chuck of the hand drill without the need for a chuck key, the tool bit is open to the shank end in the circumferential axial direction of the shank portion that is directly mounted to the drill chuck A pair of spline grooves are formed, and a pair of locking grooves are formed in a axial direction along the circumference between the spline grooves, and the tool bits are characterized in that for screw driver bits, socket driver bits, and drill bits.

Description

Tool bit for keyless drill chuck}

The present invention relates to a tool bit for a keyless drill chuck, and more particularly, using a power tool provided with a keyless drill chuck to drill a metal sheet or the like, or to tighten and loosen various screws (pieces) and bolts. The present invention relates to tool bits such as screw driver bits, socket driver bits and drill bits that can be mounted on a keyless drill chuck and can be quickly replaced.

Generally, a drill chuck that is a component of a hand drill and a tool bit is used, but there are many types of drill chucks. However, there are general drill chucks that detach a tool bit by loosening or tightening the drill chuck using a chuck key. Unlike the keyless drill chuck which inserts the tool bit into the keyless drum chuck without the need for the chuck key, the mounting is completed and the work can be performed immediately.

1 shows a conventional hand drill installed with a conventional drill chuck and various tool bits used to be detached and detached therefrom. To illustrate this, the hand drill 1 is installed at a body 2 and a tip end of the motor. And a general drill chuck 5 that can be tightened or loosened with a chuck key 6 so that various tool bits can be attached and detached, a handle 3 protruding downward from the rear end, and a switch 4 configured near the handle. do.

The hand drill 1 can bite the various drill bits 7 to the general drill chuck 5 to drill the basic metal, wood, concrete, etc., as well as to bite the core bit 10 to perform a larger drilling operation. The screw driver bit 8 and the socket driver bit 9 can perform a screw operation such as various screws, direct connection pieces, and bolts.

However, when performing various operations using the hand drill 1 as described above, it is often necessary to switch between these operations at the construction site. In the hand drill in which the general drill chuck 5 is installed, the change of work was not inconvenient at all. .

That is, in order to proceed with the corresponding work, the tool bit suitable for the work must be inserted in the general drill chuck (5), and the general drill chuck (5) must be used after tightening using the chuck key (6). This is an inconvenient process of releasing the general drill chuck (5) with the chuck key (6), removing the corresponding tool bit used in the previous work, and then inserting the tool bit suitable for the next operation into the general drill chuck (5) and tightening with the chuck key (6). It is repeated repeatedly with every change of work.

In particular, for example, in a construction site for building a prefabricated building, it is necessary to drill a concrete drill bit to install anchors on concrete floors, and to drive various pieces (direct screw) using screw driver bits to fasten metal plates. In addition, since the work of the bolt piece using the socket driver bit is combined in order to penetrate through the thick panel, the replacement work of the very inconvenient tool bit that requires to loosen and tighten the general drill chuck every time these operations are switched. This was accompanied.

In addition, this chuck is a small component separate from the hand drill, so it is not easy to manage, and this chuck is frequently lost, so when the change of work is necessary, the tool bit cannot be replaced. Was generated.

Due to this complex problem, efforts are being made in the workplace to reduce the frequency and inconvenience of replacement of the tool bits by pre-installing the mainly used tool bits in several hand drills in order to realize more rapid work. In reality, however, there is an inconvenience of increasing the purchase cost and managing the need for providing a plurality of hand drills.

Accordingly, an object of the present invention is to provide a tool bit that can be quickly converted to each operation, such as a variety of drilling operations using a hand drill or fastening or loosening of various screws or bolts.

To this end, an object of the present invention is to provide a tool bit for a keyless drill chuck having a structure in which the corresponding tool bit used for various operations in a hand drill equipped with a keyless drill chuck can be easily and easily made.

1 is a view showing a conventional hand drill installed with a conventional drill chuck and various tool bits used to be detached thereto.

Figure 2 is an exploded perspective view of a hand drill with a keyless drill chuck installed as an embodiment according to the present invention and a screw driver bit detachable thereto.

3 to 4 is a perspective view of the socket driver bit as an embodiment according to the present invention.

5 is a perspective view of a drill bit as an embodiment according to the present invention.

<Explanation of symbols for the main parts of the drawings>

11: hand drill 12: keyless drill chuck

13: sleeve 20: screwdriver bit

21: screw bit 22, 32, 42, 52: shank

23,33,43,53: Spline groove 24,34,44,54: Locking groove

30,40: Socket driver bit 31,41: Socket part

50: drill bit 51: cutting part

The present invention for achieving the object as described above, in the tool bit having a structure that is mounted to the drill chuck of the hand drill without the need for the chuck key, the tool bit is circumferential in the shank portion that is a portion directly mounted to the drill chuck A pair of spline grooves open in the axial direction to the shank end are formed, and a pair of locking grooves are formed in the circumference between the spline grooves in a predetermined length in the axial direction, and the tool bit includes a screw driver bit, a socket driver bit, and a drill. It can be achieved by a tool bit for a keyless drill chuck characterized in that it is for a bit.

And the screw driver bit is characterized in that the shank portion provided with the pair of spline grooves and a pair of locking grooves are formed in both directions in the axial direction, and both end portions of the shank portion are formed with screwed projections formed to be bitten by the screw head grooves, respectively. do.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

2 is an exploded perspective view of a hand drill with a keyless drill chuck installed therein as an embodiment according to the present invention and a screw driver bit detachably used. As shown in the figure, one side of the screw driver bit 20 is formed with a cross-shaped protruding screw bit 21 so as to be bitten by the screw head groove, and the other side is mounted on the keyless drill chuck 12 to receive the rotational force. Shank 22 is formed, and is used to tighten or loosen various screws or fastening pieces using the hand drill 11 on which the screw driver bit 20 is mounted. The coupling structure between the screw driver bits 20 mounted thereto will be described.

The locking means is disposed in the rotational direction and the axial direction so that the coupling is achieved by inserting the screw driver bit 20 into the keyless drill chuck 12. The protrusion is elongated in the axial direction to the screw driver bit 20. A pair of ridges (not shown) that transmit rotational force and a pair of locking balls (not shown) that prevent deviating in the axial direction when the screw driver bit 20 is inserted into the keyless drill chuck 12 are provided. It is provided. The pair of ridges and a pair of locking balls are arranged in the center of the keyless drill chuck 12 in a symmetrical structure, which is arranged at intervals of 90 ° on a circle.

At this time, when the screw driver bit 20 is pushed into the keyless drill chuck 12, the shank portion 22 of the screw driver bit 20, which is mounted by being bitten by the chuck to be smoothly engaged, is symmetrically arranged circumferentially. A pair of spline grooves 23 and a pair of locking grooves 24 are formed.

More specifically, when the screw driver bit 20 is inserted into the keyless drill chuck 12, the pair of spline grooves 23 into which the pair of ridges slide and engage with the shank portion 22 are axially circumferentially. And a pair of locking grooves 24 are formed in a long direction and at the same time the pair of locking balls are temporarily pushed back and rested to form a predetermined length in the axial direction on the circumference between the pair of spline grooves 23. do.

The pair of spline grooves 23 formed in the shank portion 22 has a groove having a predetermined depth that is open to the shank end long in the axial direction to facilitate the sliding of the ridge, and has a symmetrical structure on the circumference. It is arranged at intervals.

In addition, the pair of locking grooves 24 formed in the shank portion 22 are formed to be deeply recessed in a long direction in the axial direction, but the bottom cross section of the groove is semi-circular so that the locking ball can be seated, and the pair of locking grooves 24 Are each disposed between the pair of spline grooves 23 and the spacing is 180 °. In the pair of spline grooves 23 and the pair of locking grooves 24, the circumferential intervals between these grooves are arranged at 90 degrees.

That is, when the screw driver bit 20 is inserted into the keyless drill chuck 12, the ridge and the locking ball of the keyless drill chuck 12 are formed in the spline groove 23 and the locking groove 24 formed in the shank portion 22. It is a structure that engages with each other, and these are combined.

Since the mounting is completed by inserting the shank portion 22 of the screw driver bit 20 into the center of the keyless drill chuck 12 by such a structure, the hand drill 11 equipped with the screw driver bit 20 is provided. By using the fastening or loosening of various screws or direct connection pieces can proceed quickly.

The process of separating the tool bit from the keyless drill chuck 12 in order to switch to another operation may include a sleeve 13 provided on the outside of the drill chuck so as to selectively restrain the outside of the locking ball, that is, the rear of the hand drill 11, that is, the body ( By moving in the direction 14), the locking ball is not restrained from the sleeve 13 so that the locking action is terminated and the tool bit is easily released by separating the tool bit from the keyless drill chuck 12.

Meanwhile, the screw driver bit may be formed in a structure that can be used in both directions. Specifically, the screw driver bit has a shank portion provided with the pair of spline grooves and the pair of locking grooves in both axial directions. At both ends of the shank portion, a threaded portion that is inserted into the screw head groove and can be snapped is formed with a projection. At this time, each screwed portion should be formed between the symmetrical spline grooves at the end so that the ridge does not prevent the ridge from entering the spline groove during insertion of the shank portion of the screw driver bit into the keyless drill chuck. In addition, the protruding screw bit is preferably formed so that the length of the protruding screw bit can be bitten by the screw head groove, but is short enough to prevent the coupling between the shank portion and the keyless drill chuck. As the screw bit is formed on both sides of the screw driver bit in this way, even if one of the screw bit parts is damaged during use, the opposite screw bit can be used to increase utilization and reduce purchase cost.

3 to 4 are perspective views of the socket driver bit, wherein the socket driver bit 30 of FIG. 3 is a hexagonal driver bit which can be tightened or loosened when the bolt or the screw head is hexagonal, and the socket driver bit 40 of FIG. ) Is a triangular driver bit used when the screw head is a triangle.

As shown in the drawing, one of the socket driver bits 30 and 40 is provided with socket portions 31 and 41 that can be bitten by covering the head of an angled screw, and on the opposite side, it is bitten by a keyless drill chuck 12. Shank portions 32 and 42 are formed.

The socket driver bits 30 and 40 also insert the shank portions 32 and 42 into the keyless drill chuck 12 so that the shank portions 32 and 42 have a pair of spline grooves symmetrically arranged circumferentially. A pair of locking grooves 34 and 44 is formed on the circumference between the 33 and 43 and the pair of spline grooves 33 and 43. Since the spline grooves 33 and 43 and the locking grooves 34 and 44 formed in the shank portions 32 and 42 of the socket driver bits 30 and 40 are the same as those described in detail in the screw driver bits 20. Description of specific shapes will be omitted.

5 is a perspective view of a drill bit used when drilling a metal sheet or wood.

As shown in the figure, one side of the drill bit 50 is formed with a spiral cutting portion 51 for performing a drilling operation, and the other side is formed with a shank portion 52 which is bitten by a keyless drill chuck 12 to receive rotational force. do.

The drill bit 50 also includes a pair of spline grooves 53 and a pair of splines symmetrically arranged circumferentially in the shank portion 52 so that the mounting is completed by inserting the shank portion 52 into the keyless drill chuck 12. A pair of locking grooves 54 are formed long in the axial direction on the circumference between the grooves 53. Since the shape of the spline groove 53 and the locking groove 54 formed in the shank portion 52 of the drill bit 50 is the same as described in detail in the screw driver bit 20, a detailed description thereof will be omitted.

As described above, the shank portion of the screw bit for the screw driver bit 20, the socket driver bit 30 and 40, and the drill bit 50 can be quickly mounted or detached to the keyless drill chuck 12 as described above. When a pair of spline grooves and a pair of locking grooves are provided, the keyless drill chuck 12 is mounted by simply inserting the corresponding tool bits, and the keyless is used to separate the corresponding tool bits for switching to another operation. Pushing the sleeve 13 provided on the outer side of the drill chuck 12 to the rear and removing the tool bit can be easily detached, thereby enabling quick replacement of the tool bit, thereby improving work efficiency.

When the tool bit according to the present invention is mounted on a hand drill equipped with a keyless drill chuck and used, the corresponding tool is appropriate for each corresponding work such as tightening and loosening of various screws or bolts, drilling of metal sheets or various panels, and the like. Since it can be easily replaced and used, there is an advantage that the work conversion is quicker and the work efficiency is increased.

Claims (2)

In a tool bit having a structure in which the drill chuck of the hand drill does not need a chuck key, The tool bit has a pair of spline grooves open to the shank end in the circumferential axial direction, which is a part directly mounted to the drill chuck, and a pair of locking grooves axially axially arranged on the circumference between the spline grooves. Is formed, the tool bit is a screw driver bit, a socket driver bit, a drill bit for a keyless drill chuck characterized in that for the drill bit. 2. The screw driver bit according to claim 1, wherein the shank portion provided with the pair of spline grooves and the pair of locking grooves is formed in both directions in the axial direction, and both end portions of the screw driver protrusions are formed so as to be bitten by the screw head grooves. Keyless drill chuck tool bits, characterized in that each formed.