JPH09313233A - Decorative tack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by the stabilization of precision and quality by a method wherein, for a female die, a cylindrical shaft part and a head part are integrally formed, and the cylindrical shaft part is pressurized using a metal die, and the leading end part of the cylindrical shaft part is formed into a tapered shape wherein the diameter is contracted. SOLUTION: A female die 2 comprises a cylindrical shaft part 5 and a head part, and both parts are integrally formed. For this die 2, a hollow rivet 7, which is a standardized product of JIS standard or others, and is header-process-formed, is adopted, and its cylindrical shaft part 8 is deformed into a cylindrical shaft part 5 of the female die 2, and is formed into a tapered shape in which the shaft part of a male die is fitted. A protruding part 10 at the center of a metal die 9 is fitted in a hole 8a of the cylindrical shaft part 8, and an annular recessed part 11 being provided around the protruding part 10, is fitted on a peripheral edge mouth part 8b of the cylindrical shaft part 8, and presses it. The hollow rivet 7 has a thickness and strength, and the precision is uniform. Since the hollow rivet is hard to be deformed at the time of installation, or at the time of compressing with the male die, its quality can be kept uniform as well. Also, since the diameter of the hole 5a of the cylindrical shaft part 5, which is formed by contracting the diameter of the leading end part 8b, is uniform, the installability with the shaft part of the male die is also favorable, and the quality is stabilized as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative stud used for clothes, bags and the like.

[0002]

2. Description of the Related Art A decorative tack of this type is composed of a male die a and a female die b as shown in FIG. 3, and is formed by punching and molding thin metal plates and caulking them together.
The male die a has a shaft portion c and a head portion d, and the female die b has a tapered cylindrical shaft portion e into which the shaft portion c is fitted and a head portion f.

In this decorative tack, as shown in FIG. 4, the shaft part c of the male mold a is fixed through the holes i of the cloths g and h such as leather of a bag, and then fixed to the shaft part c of the female mold b. After fitting and assembling the cylindrical shaft portion e, the center portion of the head portion d of the female die b is pressed by the striking rod j to compress and attach between the male die a and the female die b. As shown in FIG. 5, the decorative tack is thus a male type a.
The fabrics f and g can be sandwiched between the male mold a and the female mold b.
Either the head of the female type b or the female type b is visible and functions as a decorative button.

At this time, the shaft portion c of the male die a is compressed and deformed in the space inside the tubular shaft portion e of the female die b, as shown by the broken line in FIG. It is not necessary to prepare a plurality of male molds a having different lengths of the shaft portion c. In that respect, it is more versatile than a case where a plurality of hollow rivets having different shaft lengths are used and attached in combination with an annular washer.

[0005]

However, when the cylindrical shaft portion e of the female die b is stamped and formed, the center position is likely to shift, resulting in poor uniformity and uneven quality. Moreover,
Since the cylindrical shaft part e is easily deformed when assembled and compressed with the male mold a because the material is thin, it is necessary to press the central part of the head part d with a striking rod, which requires a skilled work. There is.

The present invention solves the above problems, uses a female die of stable quality with high accuracy, facilitates the assembling work of the male die and the female die, and greatly reduces the cost during the operation. The purpose is to provide products with tacks at low cost.

[0007]

In order to achieve the above object, the present invention has a male type having a shaft portion and a head portion, and a female portion having a cylindrical shaft portion and a head portion into which the male type shaft portion is fitted. In the decorative stud provided with a mold, the female mold adopts a hollow rivet in which a cylinder shaft portion and a head are integrally formed, and the tip of the cylinder shaft portion is pressed by pressing the cylinder shaft portion with a mold. Is deformed so as to have a tapered shape with a reduced diameter.

Incidentally, the taper shape in the present invention is not limited to a so-called perfect taper shape which is inclined in a straight line shape, but also a curved surface shape in which the diameter gradually decreases toward the tip as shown in the embodiments described later. It also includes things.

According to the present invention, the female mold has a hollow rivet,
For example, JIS standard and other standard products can be adopted, so the precision is constant, and the head and the cylinder shaft are integrally molded and have a thickness, so they are not easily deformed during assembly or processing, and the quality is constant. Can be kept. By pressing the hollow rivet with a mold, the cylindrical shaft portion is deformed into a tapered shape with a reduced diameter at the tip end, so that the diameter of the hole is constant and the quality is stable.

In addition, the male type shaft portion is forcibly fitted to the female type cylindrical shaft portion to be surely assembled, and the accuracy of the female type is also high. It is possible to hit directly with a hammer without the need for skilled work such as. Therefore, even an unskilled person can easily perform those operations and reduce the occurrence of defective products.
Compared with the conventional punched female mold, the female mold itself costs a little, but the overall cost can be reduced due to the significant cost reduction of the work surface. It can be provided at low cost.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an embodiment of the decorative tack of the present invention. This decorative tack is composed of a male die 1 and a female die 2. The male die 1 uses a regular stud (see FIG. 4 shown in the conventional example) obtained by punching and forming a thin metal plate. A flange portion 3a is integrally formed on the shaft portion 3 of the male die 1, and the periphery of the head portion 4 is bent and crimped to the flange portion 3a.

The female die 2 comprises a cylindrical shaft portion 5 and a head portion 6,
Both are molded integrally. This is a JIS standard product or another standard product, in which a hollow rivet 7 formed by processing a header is adopted and its cylindrical shaft portion 8 is replaced with the cylindrical shaft portion 5 of the female die 2.
It is made into a taper shape to which the shaft portion 3 of the male die 1 is fitted. The taper shape is not limited to a so-called straight taper shape that is a perfect taper shape, but is also a curved surface shape in which the cylindrical shaft portion gradually decreases in diameter toward the tip as formed by the processing step described below. Include items.

FIG. 2 shows the processing steps. FIG.
Reference numeral 9 shown in (b) denotes a mold, in which a central convex portion 10 is fitted in a hole 8a of a cylindrical shaft portion 8 of the hollow rivet 7, and an annular concave portion 11 provided around the convex portion 10 is a cylindrical shaft portion. The peripheral edge opening 8b of 8 is fitted and pressed. As in the conventional example shown in FIG. 4, the hollow rivet 7 has thickness and strength as compared with a female mold in which two parts of a shaft part and a head part are punched out from a thin metal plate and caulked, and accuracy is improved. Is also constant. Further, since it is hard to be deformed when assembled or compressed with the male die 1, the quality can be kept constant. Further, since the diameter of the hole 5a of the cylindrical shaft portion 5 formed by reducing the diameter of the tip portion 8b is constant, the assembling property with the shaft portion 3 of the male die 1 is good and the quality is stable.

The head 6 of the female die 2 is shown in FIG.
As described above, when it is attached to a cloth such as a bag, it becomes the outer surface of the decorative stud and the appearance, so it is advisable to adopt various shapes.

Further, since the male mold 1 and the female mold 2 are easily assembled and the female mold 2 is highly accurate, it is possible to directly hit them with a hammer or the like without the need for skilled work when compressing them through the cloth. become. Therefore, even an unskilled person can easily perform those operations and reduce the occurrence of defective products, so that the operation cost can be reduced and the female die 2 can be used when compared with the conventional female die that has been punched. Although it costs a little on its own, it is possible to reduce the cost as a whole by drastically reducing the cost of work, and it is possible to provide a product with a decorative tack at a low cost.

[0017]

According to the present invention, by using a female die of which the quality is stable with high accuracy, the assembling work of the male die and the female die is facilitated, and the cost for the work is greatly reduced, so that the decorative tack is provided. It is possible to provide a product with a mark at a low price.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a decorative tack of the present invention.

FIG. 2 is a side view showing a step of pressurizing a female mold used in the embodiment.

FIG. 3 is a vertical sectional side view showing a conventional example.

FIG. 4 is a side view showing a process of attaching a conventional decorative tack to a cloth.

FIG. 5 is a perspective view showing a state in which the decorative tack is attached to the bag.

[Explanation of symbols]

 1 Male type 2 Female type 3 Shaft part 4, 6 Head part 5, 8 Cylindrical shaft part 7 Hollow rivet 9 Mold

Claims (1)

[Claims] 1. A decorative stud comprising a male die including a shaft portion and a head portion, and a female die including a cylindrical shaft portion and a head portion into which the male shaft portion is fitted, wherein the female die is the tubular shaft portion. Also, by adopting a hollow rivet with an integrally molded head, and pressing the cylinder shaft with a mold, the tip of the cylinder shaft was deformed into a tapered shape with a reduced diameter. A characteristic decorative tack.