JPS59103014A - Method of fixing metalic sheet and bolt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of fixing a bolt to a thin metal plate easily and with sufficient strength.

Generally, when fixing an object to a thin metal plate, a method is used in which bolts are inserted into the thin metal plate in advance to simplify the assembly work.

In the past, various fixing methods of this type have been proposed, but in particular, as a means to prevent the bolt from rotating, it has been proposed to provide a protrusion that is polygonal or divided into several points on the lower surface of the flange that forms the bolt head. This is inserted into the back surface of the thin metal plate using a press or the like. Therefore, long-term use tends to cause backlash and loosening of the tightening nuts, and there are disadvantages in that sufficient strength cannot be ensured.

The present invention eliminates such drawbacks, and aims to provide a method for fixing a thin metal plate and a bolt, which can be easily fixed with sufficient strength.

In order to achieve the above object, the present invention mainly consists of forming a striped knurled part in the axial direction with a predetermined length left at the end of the head.

A bolt integrally provided with a flange having a protrusion formed concentrically with the bolt shaft on the lower surface at the upper end of the head,
Pressing the protrusion into a hole drilled in the thin metal plate and pressing the metal thin plate causes the protrusion to bite into the metal thin plate, thereby filling and fixing the thin plate peak part which has been plastically deformed between the knurled part and the flange part. It is characterized by

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

In the drawings, Fig. 1 is a cross-sectional side view showing the bolt and thin metal plate before press-fitting, Fig. 2 is a cross-sectional view taken along the line 2-2 in Fig. 1, and Fig. 3 shows the entire state in which the bolt is press-fitted into the thin metal plate. A cross-sectional side view showing,
FIG. 4 is a cross-sectional side view showing a state in which the state in FIG. 3 is pressed.

First, when fixing, as shown in FIG. 1, a bolt 1 and a thin metal plate 2 to which the bolt is fixed are prepared.

The bolt 1 has a round bar-shaped head 3 with a predetermined length left at the end 3ak to form a striped knurled part 4 in the axial direction, and this knurled part 4 has a cross section extending over the circumference as shown in FIG. It has a repeating zigzag shape. Further, a flange 5 having a predetermined thickness and having a protrusion 6 on the lower surface 5a is integrally provided at the upper end of the head 3.

This protrusion 6 is integrally formed on the lower surface 5a in a concentric circular shape with respect to the axis of the bolt 1. Therefore, between the flange part 5 and the knurling part 4, the inner diameter is smaller than the outer diameter of the knurling part 4 (because the peaks of the knurling part 4 are raised), and the outer diameter is smaller than the outer diameter of the knurling part 4. A ring-shaped space S defined by the inner diameter of 6 is formed. On the other hand, neck T portion 7 of bolt 1. That is.

A threaded portion 8 extends from the lower end of the head 3, and thus constitutes the bolt 1.

On the other hand, a circular hole 9 having an inner diameter into which the head 3 of the bolt 1 can be press-fitted is bored in the thin metal plate 2.

When fixing the bolt 1 and the thin metal plate 2, first press the head 83 of the bolt 1 into the hole 9 of the thin metal plate 2 as shown in FIG. 1 and the thin metal plate 3 are pressed together, the result is as shown in FIG. 4, and the thin plate 2 and the bolt 1 are fixed. That is, the protrusion 6 bites into the back surface 2a of the thin metal plate 2 through plastic deformation, and due to this biting, the peak 2a of the thin plate existing inside the protrusion 6 moves into the space S within the protrusion 6 due to plastic deformation, and the space S As a result, the bolt 1 is fixed in the axial direction by the peak portion 2a filled between the lower surface 5a of the collar portion 5 and the knurling portion 4. Further, the rotational direction of the bolt 1 is fixed by the knurled portion 4. Therefore, the protrusion 6 does not have the function of preventing rotation as in the conventional case, but has the function of preventing the bolt from being pulled out by causing plastic deformation, and the bolt 1 is securely fixed to the thin metal plate 2. I'm smiling.

As is clear from the above explanation, the fixing method according to the present invention is to knurl the head of the bolt to prevent it from rotating, and to use a protrusion provided on the lower surface of the collar provided at the upper end of the head. Due to the action of the protrusion formed concentrically with respect to the bolt shaft, it is possible to secure the bolt with sufficient strength to prevent it from being pulled out.

In addition, it has technical features such as being able to be fixed extremely easily by simply drilling a hole in a thin metal plate, press-fitting a bolt into the hole, and pressing.

It can be provided as a method of fixing thin metal plates and bolts with high economic value.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view showing the bolt and thin metal plate before press-fitting.
Figure 2 is a cross-sectional view taken along the line 2-2 in Figure 1, Figure 3 is a cross-sectional side view showing the state in which Pol H is press-fitted into a thin metal plate, and Figure 4 is a cross-sectional view of the 3-2 line in Figure 1.
FIG. 3 is a cross-sectional side view showing a state in which the state shown in the figure is pressed. In the drawings, 1 is a bolt, 2 is a thin metal plate, 2a is a thin plate ridge, 3 is a head s3a is an end, 4 is a knurled part, 5 is a flange, 5a is a lower surface, 6 is a protrusion, and 9 is a hole. It is. Patent Applicant Honda Motor Co., Ltd. Representative Patent Attorney Yoshi Shimoda Patent Attorney Kunihiko Ohashi Patent Attorney Yu Koyama Figure 4

Claims (2)

[Claims] (1) A striped knurling part is formed in the axial direction with a predetermined length left at the end of the head, and a bolt with a flange having a protrusion on the lower surface is integrally provided on the upper end of the head, and is attached to a thin metal plate. Fixation of a bolt to a thin metal plate, characterized in that the bolt is press-fitted into a drilled hole and pressed, the protrusion bites into the thin metal plate, plastic deformation occurs inside the thin plate inside the protrusion, and the bolt is fixed. Method. (2) The method for fixing a thin metal plate and a bolt according to claim 1, wherein the protrusion is formed in a concentric circular shape with respect to the axis of the bolt.