JPH11201130A - Self-tapping screw and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loosening of a fastened self-tapping screw by a state wherein an infinite number of recesses and protrusions formed on the outer peripheral part of the inner surface of a washer part formed integrally with a head part bite through a steel sheet when the steel sheet is fastened. SOLUTION: A self-tapping screw comprises a head part 1; a washer part 2 formed integrally with the head part 1; a screw part 3 formed in a protruding state integrally with the central part of the washer part 2; and a drill blade part 4 formed at the tip part of the screw part 3. An infinite number of recesses and protrusions 2a' are formed at least on the outer peripheral part 2a of the inner surface 2b of the washer part 2, and the outer peripheral part 2a is curved and formed on the screw part 3 side. The screw part 3 forms self-tapping screws formed in succession throughout a portion ranging from the inner surface 2b of a washer part 2 to a drill blade part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example,
m or galvanized steel sheet into a C-shaped or grooved shape, or assembling a framework with lightweight steel, or when fixing the steel sheet to the framework, do not open a tapped hole in the steel sheet in advance, The present invention relates to an improvement in a self-tapping screw that can assemble the framework by fixing a steel plate to the framework by screwing the steel plate while directly drilling holes.

[0002]

2. Description of the Related Art In recent years, the use of wood has been extremely reduced.
So-called steel houses are being developed. For example, 2
A steel-storey steel house has a foundation installed on a concrete foundation and a floor frame (1st floor) installed on the foundation.
And floor materials (1st floor) to be placed on this floor framework (1st floor)
And a wall panel (1) standing around the floor material (1st floor)
Floor), a floor frame (second floor) provided at the upper end of the wall panel (first floor), a floor material (second floor) provided on the floor frame (second floor), and this floor A wall panel (second floor) erected around the timber (second floor), a beam framework disposed at the upper end of the wall panel (second floor), a roof truss disposed on the beam framework,
The roof surface material and the like disposed on the roof truss are manufactured using the galvanized steel sheet having a thickness of about 1 mm.

[0003] In particular, among the above-mentioned building structural members, the frame structural members such as the floor frame, the beam frame and the roof truss are composed of a self-tapping screw made of a lightweight steel obtained by processing the galvanized steel sheet into a C shape or a groove shape. Assembling and manufacturing the framework using, and, among the building structural members, floor surface materials, wall panels, and roof surface materials are manufactured by fixing galvanized steel sheets to the framework structural members using self-tapping screws. ing. 7A and 7B show a conventional example of the self-tapping screw. FIG. 7A is a front view, FIG. 7B is a left side view, and FIG. 7C is a right side view. A washer portion 12 integrally formed with the head portion 11, a screw portion 13 integrally formed at a central portion of an inner surface 12a of the washer portion 12, and a drill blade portion formed at a tip portion of the screw portion 13 14. The inner surface 12a of the washer portion 12 of this conventional self-tapping screw is flat and has no irregularities, but there are also cases where irregularities are formed on the flat surface.

[0004]

In the self-tapping screw of the prior art, since the inner surface 12a of the washer portion 12 is flat, when the steel plate is fixed by the self-tapping screw, the self-tapping screw is fixed.・ Tapping screws could be loosened. The self-tapping screw according to the present invention, in order to eliminate the above-described problem, forms countless irregularities on at least the outer peripheral portion of the inner surface of the washer portion formed integrally with the head, and places the outer peripheral portion on the screw portion side. Due to the curved formation, when the steel plate is fixed to a member formed of a steel plate with this self-tapping screw or when a plurality of steel plates are fastened, countless irregularities formed on the curved outer peripheral portion of the washer portion There is no danger that the self-tapping screw will be loosened by biting into the steel plate, and further, it is intended to fasten a plurality of steel plates having a thickness of, for example, 1 mm or less so as to draw each other.

[0005]

In order to achieve the above object, a first aspect of the present invention provides a head 1, a washer 2 formed integrally with the head 1, and a washer 2. At least the outer periphery of the inner surface 2b of the washer 2 is formed by a screw portion 3 integrally formed at the center of the inner surface 2b of the portion 2 and a drill blade portion 4 formed at the tip of the screw portion 3. Part 2
a is formed with innumerable irregularities 2 a ′, and the outer peripheral portion 2 a is curved toward the screw portion 3 side, and the screw portion 3
Is a self-tapping screw formed continuously from the inner surface 2b of the washer 2 to the drill blade 4.

A second invention is directed to a head 1, a washer 2 formed integrally with the head 1, and a screw formed integrally with the center of an inner surface 2 b of the washer 2. 3 and a drill bit 4 formed at the tip of the screw 3, and at least an outer peripheral portion 2 a of the inner surface 2 b of the washer 2.
Innumerable irregularities 2a 'are formed on the outer peripheral portion 2a.
a is formed to be curved toward the screw portion 3, and the screw portion 3 is formed from a position at a predetermined distance T from the inner surface 2 b of the washer 2 to the drill bit 4. It is a screw.

Further, a third invention is a method of manufacturing a self-tapping screw according to the first invention, wherein a head 1, a washer 2, and an inner surface 2 b of the washer 2 are attached to one end of a metal round bar 5. (1) Forming innumerable irregularities 2a 'at least on the outer peripheral portion 2a
A step, a second step of forming the drill blade 4 at the tip of the metal round bar 5, and a second step of continuously forming the screw 3 from the inner surface 2 b of the washer 2 to the drill blade 4. A method for manufacturing a self-tapping screw, comprising: a step (3); and a step (4) of forming the outer peripheral portion 2a of the washer 2 toward the screw 3 side.

A fourth invention is a method of manufacturing a self-tapping screw according to the second invention, wherein one end of a metal round bar 5 has a head 1, a washer 2 and an inner surface 2b of the washer 2. (1) a step of forming innumerable irregularities 2a 'at least on the outer peripheral portion 2a and curving the outer peripheral portion 2a toward the metal round bar 5;
And a (3) step of forming the screw portion 3 from a position at a predetermined distance T from the inner surface 2b of the washer portion 2 to the drill blade portion 4. And a method for manufacturing a self-tapping screw.

By using the self-tapping screw manufactured as described above, that is, countless irregularities 2a 'are formed at least on the outer peripheral portion 2a of the inner surface 2b of the washer portion 2, and the outer peripheral portion 2a is formed Since the screw portion 3 is formed to be curved, when the steel plate is fixed to a member formed of a steel plate by the self-tapping screw or when a plurality of steel plates are fastened, the curved outer periphery of the washer portion is formed. There is no risk that the self-tapping screw will be loosened due to the infinite number of irregularities formed in the portion, and the self-tapping screw will not be loosened. Further, a plurality of steel plates having a thickness of, for example, 1 mm or less can be fastened to each other.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the self-tapping screw according to the present invention will be described below in detail with reference to the drawings. FIG.
1A and 1B show an embodiment of a self-tapping screw according to the first invention, wherein FIG. 1A is a front view of the self-tapping screw, FIG. 1B is a left side view thereof, and FIG. It is a diagram, for example, a hexagonal head 1, a circular washer 2 formed integrally with the head 1, and a screw formed integrally at right angles to the center of an inner surface 2 b of the washer 2. 3 and a drill bit 4 formed at the tip of the screw 3.
Innumerable irregularities 2a 'are formed on at least the outer peripheral portion 2a of the inner surface 2b (side surface of the screw portion) of the washer portion 2, and the outer peripheral portion 2a is curved toward the screw portion 3 side. It is formed continuously from the inner surface 2 b of the washer 2 to the drill blade 4.

FIG. 2 shows an embodiment of a self-tapping screw according to the second invention. FIG. 2 (a) is a front view of the self-tapping screw, FIG. 2 (b) is a left side view thereof, and FIG. The figure is a right side view of the same. For example, a hexagonal head 1, a circular washer 2 formed integrally with the head 1, and a central part of an inner surface 2 b of the washer 2 are perpendicularly integrated with each other. And a drill blade 4 formed at the tip of the screw 3, and at least an outer peripheral portion 2 a of the inner surface 2 b of the washer 2 has countless irregularities 2 a ′. The outer peripheral portion 2a is formed to be curved toward the screw portion 3, and the screw portion 3 is formed from a position at a predetermined distance T from the inner surface 2b of the washer portion 2 to the drill blade portion 4.

The innumerable irregularities 2a 'may be formed radially on the entire inner surface 2b of the washer 2, and the innumerable irregularities 2a' may be formed in the direction of tightening the self-tapping screw (right direction). (In the direction of the screw), the innumerable unevenness 2a 'may be formed to be inclined in a direction in which the steel plate bites into the steel plate.
When the self-tapping screw rotates in the loosening direction (the direction of the left-handed screw), the countless unevenness 2a 'may be formed so as to be inclined in the direction of cutting into the steel plate. The shape of the head 1 is not limited to a hexagon but may be a polygon including a quadrangle.
A (-) or (+)-shaped groove into which the tip of the tightening tool is fitted may be provided on a flat surface of a polygonal or round head including a hexagon.

FIG. 3 is a view showing a manufacturing process of the method for manufacturing a self-tapping screw according to the third invention, that is, the first invention, wherein a head 1, a washer 2, and a washer are provided at one end of a metal round bar 5. At least the outer peripheral portion 2 of the inner surface 2b (the metal round bar side surface) of the portion 2
a) forming the innumerable irregularities 2 a ′ in a, and the second forming the drill blade 4 at the tip of the metal round bar 5.
Process, and from the inner surface 2b of the washer 2 to the drill blade 4
A self-tapping screw comprising a (3) step of continuously forming the screw portion 3 over the entire surface, and a (4) step of forming the outer peripheral portion 2a of the washer 2 toward the screw portion 3 side. It is what it was. After the outer peripheral portion 2a of the washer portion 2 is curved toward the screw portion 3 in the step (4), quenching is performed to increase the hardness of the drill blade portion 4 and the rust does not occur. Is galvanized as follows.

FIG. 4 is a view showing a manufacturing process of a method for manufacturing a self-tapping screw according to the fourth invention, that is, the second invention, wherein a head 1, a washer 2, and a washer are provided at one end of a metal round bar 5. Countless irregularities 2 on at least the outer peripheral portion 2a of the inner surface 2b of the portion 2.
a 'and forming the outer peripheral portion 2a with the metal round bar 5
A first step (1) of forming a curved side, a second step (2) of forming a drill blade 4 at the tip of the metal round bar 5, and a predetermined distance T from the inner surface 2b of the washer 2. (3) forming the screw portion 3 from the position to the drill blade portion 4
And a method for manufacturing a self-tapping screw. After forming the screw portion 3 in the step (3), quenching is performed to increase the hardness of the drill blade portion 4 and zinc plating is performed so as not to rust. In the method of manufacturing a self-tapping screw according to the fourth aspect of the present invention, the number of manufacturing steps is one less than that of the method of manufacturing a self-tapping screw according to the third aspect of the invention. The part 3 cannot be formed directly from the inner surface 2b of the washer part 2.

Since the self-tapping screw of the first invention is manufactured as described above, that is, innumerable irregularities 2a 'are formed on at least the outer peripheral portion 2a of the inner surface 2b of the washer portion 2, and The outer peripheral portion 2a is formed to be curved toward the screw portion 3, and further, the inner surface 2b of the washer portion 2 is formed.
Since the screw portion 3 is formed continuously from the above to the drill blade portion 4, as shown in FIG. 5, when the steel plate 6 is tightened and fixed to another steel plate 6 'with the self-tapping screw, as shown in FIG. The infinite number of irregularities 2a 'formed on the curved outer peripheral portion 2a of the washer portion 2 does not bite into the steel plate 6, and the self-tapping screw does not loosen.
The infinite number of irregularities 2a 'at the curved end portion of the outer peripheral portion 2a of the washer portion 2 bites into the steel plate 6, and the steel plate 6 and the other steel plate 6' are attracted to each other, and further, the inner surface 2b of the washer portion 2 , And is tightened and fixed, so that the tightening and fixing is performed more firmly.

Further, since the self-tapping screw of the second invention is manufactured as described above, that is, the self-tapping screw has countless irregularities 2a 'formed at least on the outer peripheral portion 2a of the inner surface 2b of the washer 2. In addition, since the outer peripheral portion 2a is formed to be curved toward the screw portion 3, as shown in FIG. 6, the steel plate 6 is formed by the self-tapping screw into another steel plate 6 '.
When fixed to the steel plate 6, the countless irregularities 2a 'formed on the curved outer peripheral portion 2a of the washer portion 2
And the self-tapping screw is no longer loosened. Further, the countless unevenness 2a 'of the curved tip of the outer peripheral portion 2a of the washer portion 2 bites into the steel plate 6, and the steel plate 6 and other The steel plates 6 'are drawn together and clamped.

[0017]

According to the first aspect of the present invention, there is provided a head, a washer formed integrally with the head, a screw integrally formed at a central portion of an inner surface of the washer, and a screw. Formed with a drill blade portion formed at the tip of the portion, and at least the outer peripheral portion of the inner surface of the washer portion is formed with innumerable irregularities, and the outer peripheral portion is curvedly formed on the screw portion side, The screw portion is a self-tapping screw continuously formed from the inner surface of the washer portion to the drill blade portion. The third invention, which is a method of manufacturing the self-tapping screw according to the first invention, comprises a metal round bar having a head, a washer, and countless irregularities on at least an outer peripheral portion of an inner surface of the washer. A first step of forming, a second step of forming a drill bit at the tip of the metal round bar, and a second step of continuously forming a screw portion from the inner surface of the washer to the drill bit. The method is a self-tapping screw manufacturing method including a step (3) and a step (4) in which an outer peripheral portion of the washer is curved toward the screw portion. In particular, the self-tapping screw manufactured in this manner has countless irregularities formed at least on the outer peripheral portion of the inner surface of the washer portion, and the outer peripheral portion is curved and formed on the screw portion side. Since the screw portion is continuously formed from the inner surface of the portion to the drill blade portion, when the steel plate is tightened and fixed with the self-tapping screw, the countless number of formed on the curved outer peripheral portion of the washer portion are formed. Since the irregularities bite into the steel plate and are tightened, there is no possibility that the self-tapping screw is loosened, and further, the countless irregularities at the tip of the curved outer peripheral portion of the washer bite into the steel plate,
Since the steel plates are attracted to each other and further attracted to the inner surface of the washer and fastened and fixed, there is an effect that the fastening is more firmly performed.

According to a second aspect of the present invention, there is provided a head, a washer formed integrally with the head, a screw integrally formed at a central portion of an inner surface of the washer, Formed with a drill bit formed at the end of the washer, an infinite number of irregularities are formed on at least the outer peripheral portion of the inner surface of the washer, and the outer peripheral portion is curvedly formed on the screw portion side, and the screw portion is formed. Is a self-tapping screw formed from a position at a predetermined distance from the inner surface of the washer to the drill bit. The fourth invention, which is a method for manufacturing a self-tapping screw according to the second invention, comprises a metal round bar having a head, a washer, and a myriad of irregularities on at least the outer periphery of the inner surface of the washer. A step (1) of forming and bending the outer peripheral portion toward the metal rod, a step (2) of forming a drill bit at the tip of the metal rod, and an inner surface of the washer. A method for manufacturing a self-tapping screw, comprising: a (3) step of forming a screw portion from a position spaced a predetermined distance from the drill blade portion. In the self-tapping screw manufactured in this manner, in particular, countless irregularities are formed at least on the outer peripheral portion of the inner surface of the washer portion, and the outer peripheral portion is curved toward the screw portion side. When the steel plates are tightened and fixed with a self-tapping screw, the countless irregularities formed on the curved outer periphery of the washer bite into the steel plate, and there is no possibility that the self-tapping screw may be loosened. There is an effect that the countless irregularities of the curved end portion of the outer peripheral portion of the washer bite into the steel plate, and the steel plates are attracted to each other and tightened.

[Brief description of the drawings]

FIG. 1 is a view showing a self-tapping screw according to a first invention.

FIG. 2 is a view showing a self-tapping screw according to a second invention.

FIG. 3 is a view showing a manufacturing process of a self-tapping screw according to a third invention.

FIG. 4 is a view showing a manufacturing process of a self-tapping screw according to a fourth invention.

FIG. 5 is a diagram showing an example of use of the self-tapping screw of the first invention.

FIG. 6 is a diagram showing a use example of the self-tapping screw of the second invention.

FIG. 7 is a view showing a conventional self-tapping screw.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 2 Washer part 2a Outer peripheral part 2a 'Innumerable unevenness 2b Inner surface 3 Screw part 4 Drill blade part 5 Metal round bar 6 Steel plate 6' Other steel plate 11 Head 12 Washer part 12a Inner surface 13 Screw part 14 Drill blade part T distance

Claims (4)

[Claims] 1. A head (1), a washer (2) integrally formed with the head (1), and an inner surface (2) of the washer (2).
a screw part (3) integrally formed at the center of b);
An inner surface (2) of the washer (2) is formed by a drill bit (4) formed at the tip of the screw (3).
b) at least on the outer peripheral portion (2a),
a ′) is formed, and the outer peripheral portion (2a) is curved toward the screw portion (3), and the screw portion (3) is formed from the inner surface (2b) of the washer portion (2) by a drill bit. (4) Self-characterized by being formed continuously.
Tapping screw. 2. A head (1), a washer (2) integrally formed with the head (1), and an inner surface (2) of the washer (2).
a screw part (3) integrally formed at the center of b);
An inner surface (2) of the washer (2) is formed by a drill bit (4) formed at the tip of the screw (3).
b) at least on the outer peripheral portion (2a),
a ′) is formed, and the outer peripheral portion (2a) is curved toward the screw portion (3), and the screw portion (3) is a predetermined distance from the inner surface (2b) of the washer portion (2). A self-tapping screw formed from the position where (T) is placed to the drill bit (4). 3. One end of a metal round bar (5) is provided with a head (1), a washer (2), and an inner surface (2b) of the washer (2). '), A (2) step of forming a drill bit (4) at the tip of the metal rod (5), and the washer (2).
(3) a step of continuously forming a screw portion (3) from the inner surface (2b) of the drilling portion to the drill blade portion (4); and an outer peripheral portion (2a) of the washer portion (2) with the screw portion (3). (4) A method for manufacturing a self-tapping screw, which comprises a step (4) of forming a curve on the side. 4. One end of a metal round bar (5) has a head (1), a washer (2), and an inner surface (2b) of the washer (2). ') And forming the outer peripheral portion (2a) to be curved toward the metal round bar (5), and a drill bit (4) at the tip of the metal round bar (5). A second step of forming, and a screw part (3) extending from a position at a predetermined distance (T) from an inner surface (2b) of the washer part (2) to the drill blade part (4).
(3) forming a self-tapping screw.