JP2001140831A - Drill screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill screw easily screwed into a laminated portion of a hard member such as a metal plate and a soft member such as a wood plate. SOLUTION: This drill screw 10 includes a columnar shaft part 12. A helical first male screw part 14a and a helical second male screw part 14b are formed on a circumferential face of the shaft part 12. A drill part 16 is formed on one end of the shaft part 12. The drill part 16 includes a tip portion 18. The tip portion 18 is formed with a point angle θ 1 of, for example, 120 and a diameter ϕ of the most widest part of, for example, 1 mm. An intermediate portion 20 is formed on the drill part 16 extending from the tip portion 18. The intermediate portion 20 is formed with a tip angle θ 2 of, for example, 30 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill screw, and more particularly to a drill screw used for a laminated portion of a hard member such as a metal plate and a soft member such as a wooden plate.

[0002]

2. Description of the Related Art Some conventional drill screws which are the background of the present invention are used for metal plates such as iron plates. The drill screw for a metal plate includes a cylindrical shaft portion, and a helical male screw portion is formed on a peripheral surface of the shaft portion. A drill portion is formed at one end of the shaft portion. This drill portion has a tip angle of, for example, 120 degrees. further,
At the other end of the shaft, a head that can be engaged with a tightening tool such as a driver is formed. In this drill screw for a metal plate, the tip of the drill portion is applied to the metal plate, and the whole is pressed to the metal plate side and rotated, thereby making a hole in the metal plate with the drill portion and screwing the male screw portion into the hole. You can go. Further, in the conventional wood screw which is the background of the present invention, a drill portion is not provided and a tip portion is formed to be tapered and sharp as compared with the above-described drill screw for a metal plate. With this wood screw, the male screw portion can be screwed into the wood board by rotating the tip of the wood screw while pressing the tip against the wood board.

[0003]

However, conventional drill screws for metal plates are suitable for drilling holes in metal plates and fastening metal plates, but not for wood plates. In addition, in the conventional wood screw, since the tip portion is formed sharp, a hole cannot be formed in the metal plate.

[0004] Therefore, a main object of the present invention is to provide a drill screw which can be easily screwed into a laminated portion of a hard member such as a metal plate and a soft member such as a wooden plate.

[0005]

A drill screw according to the present invention is a drill screw used for a laminated portion of a hard member and a soft member, and is formed on a columnar shaft portion and a peripheral surface of the shaft portion. An external thread portion, a drill portion formed at one end of the shaft portion, and a head portion formed at the other end of the shaft portion, wherein the drill portion has a tip portion having a relatively large tip angle and an extension from the tip portion. And a middle portion having a relatively small tip angle. In the drill screw according to the present invention, the tip angle of the tip portion of the drill portion is, for example, 105 to 125 degrees, and the tip angle of the middle portion of the drill portion is, for example, 25 to 35 degrees. In the drill screw according to the present invention, the diameter of the thickest portion at the tip of the drill portion is, for example, 1 to 2 mm. Further, in the drill screw according to the present invention, the diameter of the thickest part of the middle part of the drill part is the same as the diameter of the shaft part, for example.

A case where the drill screw according to the present invention is used in a laminated portion of a hard member such as a metal plate and a soft member such as a wooden plate will be described. In the drill screw according to the present invention, a hole is formed in a hard member such as a metal plate at a tip portion of the drill portion, and the hole is widened at an intermediate portion of the drill portion. In this case, the tip angle of the tip portion of the drill portion is, for example, 105 to 125 degrees, which is suitable for drilling a metal plate. Furthermore, in the drill screw according to the present invention, a hole of an appropriate size is formed in a soft member such as a wooden board at an intermediate portion of the drill portion, and the soft member such as the wooden board is not broken. In the drill screw according to the present invention, since the male screw portion is screwed into a hole formed in a hard member such as a metal plate and a soft member such as a wood plate, a hard member such as a metal plate and a soft member such as a wood plate are connected. It is easy to screw into the laminated part of.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the accompanying drawings.

[0008]

FIG. 1 is a front view showing an example of a drill screw according to the present invention, FIG. 2 is a side view of the drill screw, FIG. 3 is a plan view of the drill screw,
FIG. 4 is an enlarged front view showing a drill portion of the drill screw, and FIG. 5 is an illustrative sectional view taken along line VV in FIG.
The drill screw 10 includes, for example, a cylindrical shaft portion 12.

On the peripheral surface of the shaft portion 12, a spiral first male screw portion 14a and a spiral second male screw portion 14b are formed in a double manner with a space therebetween. In this case, the ridge of the first male screw portion 14a is formed higher than the ridge of the second male screw portion 14b.

A drill portion 16 is formed at one end of the shaft portion 12. Drill portion 16 includes a tip portion 18. The tip portion 18 has a tip angle θ1 (see FIG. 4) of, for example, 120 degrees, and a diameter φ of the thickest portion of, for example, 1 mm. Further, the drill portion 16 has an intermediate portion 20 extending from the distal end portion 18. The intermediate portion 20 has a tip angle θ2 of, for example, 30 degrees. Further, the drill portion 16 has a root portion 22 extending from the intermediate portion 20 to the shaft portion 12. The diameter of the root portion 22 is
For example, it is formed to have the same diameter as 2 such as 3 mm. Further, a discharge groove 24 is formed in the tip portion 18, the intermediate portion 20, and the root portion 22 of the drill portion 16. The discharge groove 24 is
In particular, as shown in FIG. 5, two points are formed at point-symmetric positions about the axis of the drill screw 10. The discharge groove 24 is
The chips shaved by the drill part 16 are removed by the drill screw 1
0 to the first male screw portion 14 from the drill portion 16.
a and a groove for discharging to the second male screw portion 14b side.

A head 26 is formed at the other end of the shaft 12. A cross-shaped hole 28 is formed in the center of the head 26 so as to be able to engage with a tightening tool such as a driver or a wrench.

Next, a case where the drill screw 10 is used for a laminated portion of a metal plate M and a wooden plate W will be described.

First, as shown in FIG.
Are arranged above the laminated portion of the metal plate M and the wooden plate W.

Then, as shown in FIG.
The tip of the zero drill portion 16 is applied to the surface of the metal plate M.

Then, the drill screw 10 is rotated while being pressed against the metal plate M side.

Then, as shown in FIG.
The hole H is formed in the metal plate M and the wooden plate W by the zero drill portion 16. That is, a hole H is formed in the metal plate M and the wooden plate W at the distal end portion 18 of the drill portion 16, and the hole H is widened at the intermediate portion 20 of the drill portion 16. In this case, the tip angle of the tip portion 18 of the drill portion 16 is, for example, 120 degrees, which is suitable for drilling a hole in a metal plate. Also,
The intermediate portion 20 of the drill portion 16 makes a hole H of an appropriate size in a soft member such as a wooden board, so that the soft member such as a wooden board does not break.

Then, as shown in FIG.
0 is completely screwed into the laminated portion of the metal plate M and the wooden plate W. In this case, the drill screw 10 is
Since the 4a and the second male screw portion 14b are screwed into the holes H formed in the metal plate M and the wooden plate W, the screw is easily screwed into the laminated portion of the metal plate M and the wooden plate W.

In this way, the drill screw 10 is used for a laminated portion of the metal plate M and the wooden plate W.

The above-described drill screw 10 has two male screw parts, that is, a first male screw part 14a and a second male screw part 14b.
Only one external thread may be formed.

In the above-described drill screw 10, the tip angle θ1 of the tip portion 18 of the drill portion 16 is 120 degrees.
In the drill screw according to the present invention, the tip angle of the tip portion of the drill portion may be in the range of 105 to 125 degrees.

Further, in the above-described drill screw 10, the diameter φ of the thickest portion of the tip portion 18 of the drill portion 16 is 1 mm.
However, in the drill screw according to the present invention, the diameter of the thickest portion at the tip of the drill portion may be in the range of 1 to 2 mm.

In the above-described drill screw 10, the tip angle θ2 of the intermediate portion 20 of the drill portion 16 is 30 degrees, but in the drill screw according to the present invention, the tip angle of the intermediate portion of the drill portion is 25 to 35 degrees. It only has to be in the range.

Further, in the drill screw 10 described above, the head 2
Although the cross hole 28 is formed in 6, the head of the drill screw according to the present invention may be formed in another shape as long as the head can be engaged with the tightening tool.

[0024]

According to the present invention, a drill screw which can be easily screwed into a laminated portion of a hard member such as a metal plate and a soft member such as a wooden plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a drill screw according to the present invention.

FIG. 2 is a side view of the drill screw shown in FIG.

FIG. 3 is a plan view of the drill screw shown in FIG. 1;

FIG. 4 is an enlarged front view showing a drill portion of the drill screw shown in FIG.

FIG. 5 is an illustrative sectional view taken along line VV in FIG. 1;

FIG. 6 is an illustrative view showing a state in which the drill screw shown in FIG. 1 is arranged above a laminated portion of a metal plate and a wooden plate.

FIG. 7 is an illustrative view showing a state in which a tip of a drill screw is applied to a surface of a metal plate from the state shown in FIG. 6;

FIG. 8 is an illustrative view showing a state in which holes are made in a metal plate and a wooden plate with a drill screw from the state shown in FIG. 7;

9 is an illustrative view showing a state in which a drill screw is completely screwed into a metal plate and a wooden plate from the state shown in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drill screw 12 Shaft part 14a 1st male screw part 14b 2nd male screw part 16 Drill part 18 Tip part 20 Intermediate part 22 Root part 24 Drain groove 26 Head 28 Cross hole θ1, θ2 Tip angle φ diameter

Claims (4)

[Claims] 1. A drill screw used for a laminated portion of a hard member and a soft member, comprising: a columnar shaft portion; a male screw portion formed on a peripheral surface of the shaft portion; and one end of the shaft portion. A drill portion, and a head portion formed at the other end of the shaft portion, wherein the drill portion has a tip portion having a relatively large tip angle, and is formed so as to extend from the tip portion, and has a relatively small tip angle. A drill screw, including an intermediate portion having. 2. The drill screw according to claim 1, wherein a tip angle of the tip portion of the drill portion is 105 to 125 degrees, and a tip angle of the intermediate portion of the drill portion is 25 to 35 degrees. 3. The drill screw according to claim 1, wherein a diameter of a thickest portion of the tip portion of the drill portion is 1 to 2 mm. 4. The drill screw according to claim 1, wherein a diameter of the thickest portion of the intermediate portion of the drill portion is the same as a diameter of the shaft portion.