JP2003322128A - Stud pin - Google Patents

Abstract

(57) [Summary] [Object] To obtain a stud pin which maintains the aesthetic appearance of a product and can be mass-produced at low cost. A thread is formed in a shaft portion, and a stud pin provided with a serration portion to be press-fitted and fixed to a work on a head portion having a larger diameter than the shaft portion is provided on a head portion. An arcuate surface 11 is formed on the outer peripheral side of the end surface of the serration portion 10 so that the thickness on the peripheral side is gradually reduced, and a flat surface continuous with the arcuate surface 11 is formed on the center side of the head 3.
Since the stud pin is provided with the neck portion 5 having a smaller diameter than the shaft portion 2 between the shaft portion 2 and the shaft portion 2, the stud pin is firmly fixed to the work without turning and coming off.
In addition, since the head of the metal plate-shaped work to which the stud pins are fixed hardly protrudes at the mounting position of the stud pins, for example, when a film is attached to the back surface, the film is caught at a corner and is damaged. That will be eliminated and the aesthetics will improve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal plate-like work, in which a head is press-fitted and fixed in a mounting hole which is preliminarily formed with a predetermined size, and a screw or a nut is screwed to a shaft portion of the work to be fastened. Regarding stud pins for attaching things.

[0002]

2. Description of the Related Art As a method for integrally fixing a screw or a nut to a thin metal plate-like work, there are usually various methods such as welding, caulking, and screwing. However, each of them has its own advantages or disadvantages. Generally, a screw thread is formed on the outer periphery of the shaft portion, or a screw thread is formed on the inner periphery of the shaft portion to form a serration portion having an outer diameter larger than the shaft portion and smaller than the head portion between the head portion and the shaft portion. On the other hand, on the other hand, the work is shown in FIG.
As shown in FIG. 5, a mounting hole 121 having an inner diameter smaller than the outer diameter of the serration portion is opened, and the serration portion 110 is
The head 103 is press-fitted into the mounting hole 121 of the workpiece 120 by press fitting. Then, in this press-fitting, when the width of the work 120 is narrow, the jig 10 for receiving the work 120 in order to regulate the force in the expansion direction due to the expansion of the mounting hole 121 due to the press-fitting.
7 is provided with a protrusion 108 to prevent the stud pin 10 from being widened and deformed by the force in the expanding direction so that the stud pin 10 is inserted into the mounting hole 121.
The first serration portion 110 is press-fitted and fixed.

[0003]

However, in the stud pin having such a shape, most of the stud pins are manufactured by cutting, so that the number of processing steps increases and the cost increases, which is expensive. ing. Further, since it is a cutting process, it is difficult to mass-produce when many products are required. Further, burrs are liable to be generated on the head due to cutting, and the products in contact with the burrs are easily scratched. Moreover, the head of the metal plate-shaped workpiece to which the stud pin is fixed protrudes at the mounting position of the stud pin. Issues such as damage to

An object of the present invention is to solve the above problems and to obtain a stud pin which can maintain the aesthetics of the product and can be mass-produced at low cost.

[0005]

The object of the present invention is to provide a shaft portion 2
In the stud pin in which a screw thread is formed on the inner circumference or the outer circumference, and the serration portion 10 press-fitted and fixed to the work 20 is provided on the head side having a larger diameter than the shaft portion 2, the serration is formed on the outer circumference of the head portion 3. The portion 10 is provided, and the arcuate surface 11 is formed on the outer peripheral surface of the end surface of the serration portion 10 so that the thickness of the peripheral edge is gradually reduced. On the other hand, on the center side of the head 3, a flat surface continuous with this is formed, Further, it is achieved by providing a stud pin having a neck portion 5 having a diameter smaller than that of the shaft portion 2 between the head portion 3 and the shaft portion 2. Further, in order to achieve this object, the head 3 is formed by press forming, and the head 3 is also formed by a stud pin in which the arcuate surface 11 on the outer peripheral side of the end surface of the serration portion 10 and the flat surface on the center side are simultaneously formed. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described with reference to FIG. In FIGS. 1 and 2, 1
Is a stud pin composed of a shaft portion 2 and a head portion 3 having a diameter larger than that of the shaft portion 2, and a female screw 4 is formed on the inner periphery of the shaft portion 2. The female screw 4 is formed so as to penetrate from the shaft end to the head end, but in addition to this, the head side may be formed as a bottomed hole having a bottomed cylindrical shaft shape. A neck portion 5 having a diameter smaller than that of the shaft portion 2 and having a width of about 1/2 of the thickness of the head portion 3 is formed between the shaft portion 2 and the head portion 3. The neck portion 5 is a metal plate. This is a groove into which the meat of the work 20 fits when the work 20 is press-fitted and fixed. As a result, the work 2
With respect to 0, it has a retaining structure and a rotation preventing structure.

A head portion 3 having a diameter larger than that of the shaft portion 2 is continuously provided on the neck portion 5, and the head portion 3 has a serrated portion having a sawtooth shape at equal intervals on the outer circumference thereof. 1
0 is formed. On the upper surface of the head portion 3, an arc-shaped surface 11 is formed on the outer peripheral side of the end surface of the serration portion 10 so that the thickness of the peripheral edge side is gradually reduced.
The top surface of the head portion 3 on the center side that is continuous with 1 is a flat surface.

Further, the outer diameter of the stud pin 1 is formed by forging, so that the strength of the metal structure as a material of the stud pin 1 is improved, and in particular, the arcuate surface 11 and the head 3 are improved. It is possible to obtain a smooth head shape in which flat surfaces are continuously connected.

In this embodiment, as shown in FIG. 3, a female screw 4 is formed on the inner circumference of the shaft portion 2 to form a screw 31.
However, in addition to this, for example, a thread (not shown) may be formed on the outer periphery of the shaft portion 2 instead of the female screw 4, and a nut (not shown) may be screwed into the thread. Good.

When the stud pin 1 thus constructed is fixed to the metal plate serving as the work 20, a mounting hole having a diameter smaller than the outer diameter of the serration portion 10 of the head 3, that is, the outer diameter of the serration is previously prepared. After making a mounting hole 21 having a size approximately the intermediate diameter between the root diameter and the root diameter, the serration portion 10 of the head 3 is driven into this hole 21. This allows
As shown in FIG. 3, the serrated portion 10 having a saw-tooth shape bites into the work 20, and at the same time, the work 2 is inserted into the neck 5.
The flesh of 0 enters, and the stud pin 1 is integrally fixed to the work 20 by preventing the stud pin 1 from rotating and coming off at the same time. At this time, since the surface of the head 3 that reaches the serration portion 10 is the arcuate surface 11, as shown in FIG.
There is no protruding corner between the work 20 and the work 20, and the entire work is substantially flat.

After the predetermined amount of stud pins 1 are fixed in this way, the object to be fastened 30 is placed on the side opposite to the head 3 and is fixed to the shaft portion 2 of the stud pin 1 with the screw 31. Thus, the object to be fastened 30 can be fixed to the work 20.

[0012]

As is apparent from the above-described embodiments of the present invention, the shaft portion 2 has threads formed therein, and the shaft portion 2
In the stud pin in which the serration portion 10 that is press-fitted and fixed to the work 20 is provided on the head side having a larger diameter, the head portion 3
The arcuate surface 11 is formed on the outer peripheral side of the end surface of the serration portion 10 provided on the outer peripheral surface side so that the thickness of the peripheral edge side is gradually reduced, and the flat surface that is continuous with the arcuate surface 11 is formed on the center side of the head portion 3. Since the stud pin is provided with the neck portion 5 having a diameter smaller than that of the shaft portion 2 with the shaft portion 2, the stud pin is firmly fixed to the work without turning and without coming off. You can get great support. In addition, the back surface of the metal plate-shaped work to which this stud pin is fixed has almost no head protruding at the mounting position of this stud pin. For example, when a film is attached to this back surface, the film is caught in a corner and damaged. There is nothing to do and the aesthetics are improved.

Further, since the arcuate surface 11 on the outer peripheral side of the end surface and the flat surface on the center side of the serration portion 10 of the head 3 are simultaneously formed by press forming, compared with the conventional case of manufacturing by cutting work, Man-hours are reduced, and inexpensive products can be provided. Moreover, since it is manufactured by forging, mass production is possible in a short time, and moreover,
Burrs are not generated on the head, and peculiar effects such as the worker being injured during work can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a stud pin showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view of an essential part showing a usage state of the present invention.

FIG. 4 is an enlarged sectional view of a main part of FIG.

FIG. 5 is a sectional front view of an essential part showing a conventional example of the present invention.

[Explanation of symbols]

1 Stud pin 2 shafts 3 heads 4 female screw 5 neck 10 Serration part 11 arc surface 20 work 21 mounting holes 30 Fastener 31 screws

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Claims (2)

[Claims] 1. A serration portion (10) having a thread formed on the inner circumference or the outer circumference of the shaft portion (2) and press-fitted and fixed to a work (20) on the head side having a larger diameter than the shaft portion (2). ) Is provided, the serration portion is provided on the outer periphery of the head portion, and an arcuate surface (11) is formed on the outer peripheral side of the end surface of the serration portion so that the thickness of the peripheral edge side is gradually reduced. A stud pin, characterized in that a flat surface continuous to the center is formed on the center side, and a neck portion (5) having a diameter smaller than that of the shaft portion is further provided between the head portion and the shaft portion. 2. The stud pin according to claim 1, wherein the head is formed by forging, and the arcuate surface on the outer peripheral side of the end surface and the flat surface on the center side of the serration portion are simultaneously formed.