JPH0719221A - Securing method of male screw to metal plate - Google Patents

Abstract

PURPOSE:To secure a male screw to a metal plate in a simple manner by forming a lot of rugged grooves parallel to an axis in a male screw head part and plural pieces of notch stepped parts on a peripheral surface of this head part respectively, while securing these rugged grooves to a peripheral wall part of a burring hole of the metal plate, and engaging a locking claw with the notch stepped part. CONSTITUTION:A lot of rugged grooves 13 parallel to an axis is formed in the peripheral surface of a head part 11 of a bolt 10 and a rectangular notch stepped part 14 in a symmetrical position at the side end of a screw shaft 12 of the head part 11, respectively. A burring hole 16 is formed in this metal plate 15 at a diameter equal to the bolt head part 11 and in height equal to the height, while about two-thirds in height of a peripheral part 17 is cut into a U-shaped form at the shorter width than that of the notch stepped part 14 and a locking claw 18 bent inward in parallel with a surface of the metal plate 15 is formed in a position corresponding to the peripheral wall part 17. When the notch stepped part 14 is mateched with the locking claw 18 and the bolt head part 11 is pressed-in the burring hole 16, the rugged grooves 13 advances into an inner surface of the peripheral wall part 17 as biting thereinto, whereby the notch stepped part 14 is engaged with the locking claw 18, and the bolt head part 11 is fitted in the burring hole 16, so that the bolt 10 is secured to the metal palte 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing screws to a metal plate.

[0002]

2. Description of the Related Art Conventionally, a method shown in FIG. 5 has been known as a method of fixing screws to a metal plate. This is a metal plate 1
This is a method in which a bolt 3 is inserted into a hole 2 formed in the metal plate 1 and the bolt 3 is fixed to the metal plate 1 by a nut 4. Also,
The method shown in FIG. 6 is to weld the bolt 3 to the metal plate 1. Furthermore, the one shown in FIG.
No. 41, the bolt 3 has a disk-shaped head portion 5, a hexagonal step shaft portion 6, and a screw shaft 7. Then, the stepped shaft portion 6 of the bolt 3 is attached to the metal plate 1.
A slightly larger hexagonal square hole 8 is formed.
Then, the step shaft portion 6 of the bolt 3 is inserted into the square hole 8 of the metal plate 1, and the step shaft portion 6 is pressed from the screw shaft 7 side in the axial direction of the bolt 3 toward the head 5 side by a punch (not shown). As a result, the outer peripheral portion of the stepped shaft portion 6 is shear-expanded and the square hole 8 of the metal plate 1 is
Also, the bolt 3 is deformed to fix the bolt 3 to the metal plate 1.

[0003]

However, among the above-mentioned conventional techniques, the nut 4 is interposed between the member 9 and the metal plate 1 in the method shown in FIG. There is a gap corresponding to the height of the nut 4. In addition, in the method of welding the bolt 3 to the metal plate 1 shown in FIG. 6, there is a constraint that a material suitable for welding must be used for the bolt 3 and distortion occurs in the metal plate 1 after welding. There is. Further, the method shown in FIG. 7 of Japanese Patent Publication No. 50-37341 requires a tool such as a punch to fix the bolt 3, and since the bolt 3 and the metal plate 1 are deformed, the strength is lowered. There was a problem such as.

The present invention has been made in view of the above circumstances and an object thereof is to provide a method capable of easily fixing a screw to a metal plate without requiring a special tool.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention forms a concave-convex groove parallel to the axis of the male screw on the head of the male screw, and forms a bearing surface on the head. In addition to forming a plurality of notch steps, a burring hole having a diameter substantially equal to the diameter of the head portion is formed in the metal plate, and the head portion of the screw is press-fitted into the peripheral wall portion of the burring hole to form the uneven groove. Is fixed to the inner surface of the peripheral wall portion of the burring hole, and the locking claw is engaged with the notch step portion to fix the screw to the metal plate.

[0006]

According to the method of fixing the screw to the metal plate, the notched step portion of the head is aligned with the locking claw of the metal plate, and the head of the male screw having the concave and convex groove is pressed into the burring hole. As a result, the head is fixed to the inner surface of the peripheral wall of the burring hole, the locking claw is engaged with the notch step, and the screw is fixed to the metal plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A male screw and a metal plate for carrying out the method for fixing a male screw to a metal plate according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a bolt 10 as a male screw has a head portion 11 and a screw shaft 12, and the head portion 11 has a cylindrical shape, and its peripheral surface is parallel to the axis of the bolt 10. The uneven groove 13 is formed. And the screw shaft 12 of the head 11
Rectangular cutout steps 14 are formed at a plurality of symmetrical positions (two positions in this embodiment) at the side end.

On the other hand, on the metal plate 15, as shown in FIG.
A burring hole 16 having a height substantially equal to 1 is formed. Then, the peripheral wall portion 1 of the burring hole 16
7 at a plurality of corresponding symmetrical positions (two positions in the present embodiment) with a width slightly shorter than the width of the notched step portion 14 of the bolt 10 and approximately 2/3 of the height of the peripheral wall portion 17 is provided. A locking claw 18 is formed that is cut in a letter shape and is bent inward in parallel to the surface of the metal plate 15.

FIG. 4 shows another embodiment of the locking claw 18, in which the entire height of the peripheral wall portion 17 of the burring hole 16 is cut and bent inward.

Next, a method of fixing the bolt 10 to the metal plate 15 will be described.

The notch step portion 14 of the head portion 11 of the bolt 10 is aligned with the locking claw 18 of the burring hole 16 and the head portion 11 of the bolt 10 is press-fitted into the burring hole 16. Then head 1
As shown in FIG. 4, the uneven groove 13 of No. 1 enters the inner surface of the peripheral wall portion 17 of the burring hole 16 while biting in, and the notch step portion 14 of the head portion 11 engages with the locking claw 18 of the metal plate 15. First, the head 11 of the bolt 10 is fitted into the burring hole 16, and the bolt 10 is fixed to the metal plate.

[0013]

As described above, in the method for fixing a screw to a metal plate according to the present invention, an uneven thread groove parallel to the axis of the male screw is formed in the head of the male screw, and the seat surface of the head is formed. A burring hole having a diameter substantially equal to the diameter of the head portion is formed on the metal plate, and the head portion of the screw is press-fitted into the peripheral wall portion of the burring hole to burring the uneven groove. Since the screw is fixed to the metal plate by fixing it to the inner surface of the peripheral wall of the hole and engaging the locking claw with the notch step, there is no gap between the metal plate and the component to be fastened. Absent. Since the male screw is fixed to the metal plate by the concave-convex groove, the burring hole, the notch step and the locking claw, the male screw does not run idle and the screw can be securely fixed and the component can be attached. . Furthermore, even if something hits the tip of the male screw and the male screw is twisted, the head of the screw is fitted in the burring hole, so the male screw does not fall off the metal plate. There is an effect. or,
According to this method, it is possible to fix a high-strength male screw using high carbon steel or alloy steel unsuitable for welding as a material of the male screw to a metal plate without welding.

[Brief description of drawings]

FIG. 1 is a perspective view of a bolt used in an embodiment of a method for fixing a screw to a metal plate of the present invention.

FIG. 2 is a perspective view showing an example of a burring hole.

FIG. 3 is a cross-sectional view showing a case where a bolt is attached to a burring hole.

FIG. 4 is a perspective view showing another embodiment of the burring hole.

FIG. 5 is a side view showing a conventional method of fixing a bolt to a metal plate.

FIG. 6 is a side view showing a conventional method of fixing a bolt to a metal plate.

FIG. 7 is a partial cross-sectional side view showing a conventional method of fixing a bolt to a metal plate.

[Explanation of symbols]

 10 Bolt 13 Uneven Line Groove 14 Notch Step 15 Metal Plate 16 Burring Hole 18 Locking Claw

Claims (1)

[Claims] 1. A method of fixing a screw to a metal plate,
An uneven groove is formed on the head of the male screw parallel to the axis of the male screw, and a plurality of notch steps are formed on the seat surface of the male screw, and the diameter of the metal plate is approximately equal to the diameter of the head. A burring hole is formed, and the head of the screw is press-fitted into the peripheral wall portion of the burring hole to fix the uneven groove to the inner surface of the peripheral wall portion of the burring hole and the locking claw to the notch step portion. A method for fixing a male screw to a metal plate, characterized in that the screw is fixed to the metal plate by engaging them.