JP2001079783A - Drilling tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling tool to save troublesome work to reinstall a driver bit and a hexagonal socket by removing a drill or to save a trouble to prepare another electric tool at the time of screw or bolt-fastening various facility equipment after inserting plugs and anchors in a drill hole applied on a fragile wall surface lathing of a gypsum board, etc. SOLUTION: This drilling tool has a shaft part having a head end part having a cutting blade on its head end, a spiral groove continued to it and a cylindrical driver shaft holding part through a flange on a rear end of the shaft part, a hexagonal hole 4 is formed toward the head end side from the rear end side so as to fit on a hexagonal shaft part of a hexagonal shaft plus bit for an electric driver on this driver shaft holding part, and a cross hole 5 is formed toward the head end side continuously from this hexagonal hole. Consequently, it is possible to engage it with a cross head end part of the hexagonal plus bit for the electric driver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling tool necessary for inserting plugs and anchors used for mounting various equipments on a fragile wall base such as a gypsum board or the like.

[0002]

2. Description of the Prior Art Conventionally, a drill having a twisted shank portion leaving a mounting portion and a triangular-pointed blade portion, which is adapted to be attached to the tip of an electric drill as a drilling tool. Is used. Alternatively, Japanese Utility Model Publication No. 6-32325 has been proposed for a manual driver.

[0003]

However, when mounting various equipment on a fragile wall base such as a gypsum board, a drill attached to the power tool is drilled on the wall base, and plugs and anchors are mounted on the wall base. After inserting the screw or bolt into the drilled hole, remove the drill from the power tool to screw the screws and bolts into the plugs and anchors inserted into the base of the wall through various equipment, and use the screwdriver bit and hex socket on the power tool. Do the troublesome work of re-attaching, or in addition to the power tool with the drill,
I had to have another power tool with a screwdriver bit and a hex socket. In order to solve the problem, it is necessary to use a
Although -32325 has been proposed, only the + and-machining portions at the tip of the driver bit are fitted with the drilling tool,
There is a problem that rattling occurs, accurate drilling is difficult, and when used in an electric tool, the fitting portion is immediately damaged.

[0004]

In order to solve the above-mentioned problems, a first aspect of the present invention is a drilling tool having a front end portion having a cutting edge at a front end and a cylindrical driver shaft holding portion at a rear end. In the above, a hexagonal hole is formed from the rear end side toward the front end side in the cylindrical driver shaft holding portion so as to fit with the hexagonal shaft portion of the hexagonal axis plus bit for the electric screwdriver, and continuously from the hexagonal hole. It employs a configuration in which a cross-shaped hole is formed so as to engage with the cross-shaped tip of the hexagonal axis plus bit for the electric screwdriver toward the tip. According to a second aspect of the present invention, there is provided the drilling tool according to the first aspect, wherein the outer surface of the cylindrical driver shaft holding portion is formed into a hexagonal column so as to engage with a hexagonal socket for an electric screwdriver. It was done. The invention of claim 3 is based on claim 1,
The drilling tool according to claim 2, wherein a cylindrical shaft portion provided with one or more helical grooves extending continuously from the distal end side of the cylindrical driver shaft holding portion toward the distal end portion is provided,
The tip has a sharp tip on the center axis of the foremost end, and gradually expands its diameter toward the outer peripheral surface at the end of the cylindrical shaft. A cutting portion that coincides with the terminal end surface of the crest of the groove and forms flat surfaces on both side surfaces extending in the central axis direction from the outer peripheral surface, and gradually from the sharp tip toward the outer peripheral surface of the terminal end of the cylindrical shaft portion. A chip discharging rib adjacent to the end face of the valley of the spiral groove provided in the shaft portion, and the largest diameter expanding portion is adjacent to the chip, and the cutting portion and the chip discharging rib are connected to the drilling tool. Are provided at a position symmetrical with respect to the center axis.
Finally, the invention according to claim 4 is the drilling tool according to any one of claims 1 to 3, wherein the cylindrical shaft portion is provided between the cylindrical driver shaft holding portion and the cylindrical shaft portion. This adopts a configuration in which a flange having a diameter larger than the diameter is provided.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the drilling tool 1 has a cylindrical driver shaft holding portion 2 at a rear end.
Hex Axis Part 2 of Hex Axis Plus Bit 22 for Electric Screwdriver
A hexagonal hole 4 is formed in the cylindrical driver shaft holding portion 2 from the rear end side to the distal end side so as to fit with the hexagonal hole 3. The cross hole 5 is provided to engage with the cross tip 24 of the shaft plus bit. Further, a flange 3 having a diameter larger than the diameter of the cylindrical shaft portion 6 is provided on the distal end side of the cylindrical driver shaft holding portion 2, and the front end of the flange 3 is positioned from the surface of the flange 3 opposite to the cylindrical driver shaft holding portion 2. A cylindrical shaft portion 6 provided with a single spiral groove 7 extending toward the portion is provided.
It has a sharp tip 9 on the central axis 10 and gradually expands its diameter toward the outer peripheral surface at the end of the cylindrical shaft portion, and the largest diameter portion forms a peak of the spiral groove 7 provided in the shaft portion. A cutting portion 11 that coincides with the end surface and has flat surfaces on both sides extending from the outer peripheral surface in the direction of the central axis, and the diameter gradually increases linearly from the sharp tip, and the largest diameter expanding portion is formed on the shaft portion. A position where the chip discharging ribs 12 corresponding to the end surfaces of the provided valleys of the spiral grooves are adjacent to each other, and the cutting portion 11 and the chip discharging ribs 12 are point-symmetric with respect to the center axis 10 of the drilling tool 1. Are provided in pairs.

The drilling tool 1 of the present invention has the above-described configuration, and is attached to a power tool 21 as shown in FIG.
Into the hexagonal cross bit 22. At this time, the hexagonal shaft portion 23 of the hexagonal cross bit 22 and the hexagonal hole 4 of the driver shaft holding portion 2 are fitted together, and the tip cross 24 of the hexagonal cross bit 22 and the driver shaft holding portion 2 may be adjusted depending on the mounting position of the bit. The cross hole 5 is fitted. Also, when using a circular cross bit for a power tool or a hand-shaped cross driver, the cross-processed portion at the end and the cross hole 5 of the driver shaft holding portion 2 are fitted, and the six side surfaces of the hexagon hole 4 are circular. Support to envelop the side of the shaft. When using a hexagon bolt to mount various devices on the wall, instead of using a hexagonal cross bit, a hexagon socket is usually attached to the power tool and the hexagon bolt is tightened. The hexagonal outer peripheral surface 13 is used by fitting it into a hexagonal recess of a hexagon socket. As described above, various bits and drilling tools 1
The torque of the power tool 21 is stably transmitted to the sharp tip 9 of the drilling tool 1 without rattling. As shown in FIG. 6 (A), when drilling a fragile wall surface base 31 such as a gypsum board, the largest diameter portion coincides with the terminal surface of the ridge of the spiral groove 7 provided in the shaft portion 6. At the same time, the chips generated by the cutting portion 11 pass through the chip discharge ribs 12 from the sharp tip 9, are sent to the spiral groove 7, and are discharged to the outside of the wall surface base 31. At this time, the chip discharge ribs 12 gradually increase in diameter linearly, and since the largest diameter enlarged portion coincides with the end surface of the valley of the spiral groove 7 provided in the shaft portion, the cutting chips are discharged for chip discharge. It is possible to discharge the material to the outside of the wall base 31 without staying in the ribs 12. This is to prevent a flower blooming phenomenon that occurs around the through hole 32 on the back surface of the wall base 31 which often occurs during drilling. Connect. After the drilling is completed, as shown in FIG.
2, the drilling tool 1 is pulled out from the hexagonal cross bit 22, and screws are used to attach various equipment to the hexagonal cross bit 22.

By providing a flange 3 having a diameter larger than the diameter of the cylindrical shaft 6 between the driver shaft holding portion 2 and the cylindrical shaft 6, the flange 3 functions as a stopper.

In the case of forming a hole in a gypsum board having a structure in which gypsum is sandwiched between papers, the cutting portion 8 is formed in order to form a through-hole without breaking the paper on the back of the board more than necessary. It is desirable that the tip angle α formed by the outer peripheral surface be an acute angle of about 45 degrees. In order to produce the drilling tool 1 at low cost, it may be integrally formed by injection molding.

[0009]

As described above, according to the present invention, drilling can be performed with a driver bit or a hexagon socket attached to a power tool, so that various types of equipment can be mounted on a fragile wall base such as a gypsum board. Drilling necessary to insert the plugs and anchors used in the case into the wall foundation, and after inserting the plugs and anchors into the holes drilled in the wall foundation, screws and bolts are passed through the various equipment to the wall. In order to screw into the plugs and anchors inserted into the base, remove the drill from the power tool and reattach the hexagonal cross bit to the power tool, or in addition to the power tool with the drill, the driver bit and There is no need to prepare a separate power tool with a hexagon socket, so significant labor savings can be obtained and the back of the gypsum board To penetrate without breaking large paper than necessary, it is possible to stably exhibit the ability of the plug plugging the through hole.

[Brief description of the drawings]

FIG. 1 is a front view of a drilling tool.

FIG. 2 is a plan view of a drilling tool.

FIG. 3 is a bottom view of the drilling tool.

FIG. 4 is a sectional view taken along the line AA of the drilling tool.

FIG. 5 is a diagram showing a use situation of a drilling tool.

FIG. 6: Conventional example

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling tool 2 Holding part 3 Flange 4 Hexagon hole 5 Cross hole 6 Shaft 7 Spiral groove 8 Tip 9 Tip 10 Center axis 11 Cutting part 12 Rib 13 Outer peripheral surface 21 Electric tool 22 Bit 23 Hex axis 24 Cross tip 31 Board 32 Hole 33 plug

Claims (4)

[Claims] 1. A drilling tool having a front end portion having a cutting edge at a front end and a cylindrical driver shaft holding portion at a rear end, wherein a cylinder is fitted to a hexagonal shaft portion of a hexagonal shaft plus bit for an electric screwdriver. A hexagonal hole is formed in the shape of the driver shaft holder from the rear end toward the front end, and the hexagonal hole for the electric screwdriver is continuously engaged from the hexagonal hole toward the front end with the cross end of the hex shaft plus bit for the electric screwdriver. Drilling tool, characterized by being formed into a cross hole. 2. The drilling tool according to claim 1, wherein an outer surface of the cylindrical driver shaft holding portion is formed into a hexagonal column so as to engage with a hexagonal socket for an electric screwdriver. tool. 3. The drilling tool according to claim 1, wherein one or more spiral grooves extending continuously from the distal end of the cylindrical driver shaft holding portion toward the distal end are provided. In addition, a cylindrical shaft portion is provided, and the distal end portion has a sharp tip on the center axis of the foremost end, and gradually expands in diameter toward the outer peripheral surface at the end of the cylindrical shaft portion, and has a maximum diameter expanding portion. A cutting portion that matches the terminal surface of the crest of the spiral groove provided in the shaft portion and forms flat surfaces on both side surfaces extending in the central axis direction from the outer peripheral surface, and the cylindrical shaft portion from the sharp tip. The diameter gradually increases toward the outer peripheral surface at the end of the chip, and the largest diameter expanding portion is adjacent to a chip discharge rib coinciding with the terminal surface of the valley portion of the spiral groove provided in the shaft portion, and the cutting portion and A hole provided with a pair of the chip discharging ribs at positions symmetrical with respect to a center axis of the drilling tool. Opening tool. 4. The drilling tool according to claim 1, wherein the diameter of the cylindrical shaft portion is larger than the diameter of the cylindrical shaft portion between the cylindrical driver shaft holding portion and the cylindrical shaft portion. A drilling tool characterized by providing a flange.