JPH08299028A - Snap fastener - Google Patents

Abstract

PURPOSE: To provide a snap fastener capable of easily expanding and deforming the protruded tip section of a projection by an impact even when a hard resin is used for the material of a rivet member, capable of preventing the occurrence of cracks at the root of the projection and the root of an expansion deformation section, and capable of preventing the drawing of a flexible sheet into through holes by the projection. CONSTITUTION: This snap fastener is constituted of rivet members 3a, 3b and coupling members 9a, 9b. A small-diameter hole section having a steeply inclined reverse conical inner periphery X and a large-diameter hole section having a gently inclined reverse conical inner periphery Y are formed in this order from the back face side on projection inserting through holes 6a, 6b provided on the coupling members 9a, 9b, and the minimum inner diameter of the small- diameter hole section is formed slightly smaller than the diameter of the projection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a rivet member having a synthetic resin substrate integrally formed with a protrusion having a circular cross section and a sharp synthetic resin, and a through hole for inserting the protrusion. And a rivet driven from one side of the flexible sheet, which comprises a fitting member integrally formed with a male or female fitting portion projecting concentrically with the through hole on the surface of a synthetic resin substrate. The present invention relates to a snap fastener in which the fitting member is attached to a flexible sheet by inserting the protrusion of the member into the through hole and expanding and deforming the protruding tip end portion of the member by striking.

[0002]

2. Description of the Related Art In a conventional snap fastener of this type, as shown in FIGS.
The inner peripheral surface d of the through hole c into which the protrusion b of
Was formed in a circle substantially parallel to the central axis, and the inner peripheral surface d of the through hole c and the surface of the synthetic resin substrate e formed a right angle.

Therefore, when the projecting tip of the projection b of the rivet member a driven from one side of the flexible sheet (for example, cloth for clothes) f is hit and expanded and deformed, as shown in FIG. Further, if the rivet member a is made of a soft resin that is deformed by bending at a right angle until the expanding deformation part g comes into surface contact with the surface of the synthetic resin substrate e, the expanding deformation part g
Is so soft that the expanding deformation part g is easily deformed by the force when the elastic fitting of the male and female snaps is released, and it is difficult to exert the retaining function by the expanding deformation part g.

When a relatively hard resin such as tenac resin is used as the material of the rivet member a, the protrusion b
Since a large force is required when hitting the tip of the protrusion to expand and deform it, a large force acts on the base of the protrusion b,
Firstly, as shown in FIG. 11, cracks h are likely to occur at this portion.

Therefore, when the snap fastener is attached to the flexible sheet f, the projection b may be cracked between the synthetic resin substrate j. Further, even if the clothes to which the snap fasteners are attached are pulled, or when the elastic fitting of the male and female snaps is removed, the clothes may be broken at the position of the crack h even if they are not broken at the time of attachment.

Moreover, due to the elastic restoring force of the material resin, the expanding deformation part g is not deformed to a right angle with respect to the protrusion b, and a gap i is formed between the expanding deformation part g and the surface of the synthetic resin substrate e. Therefore, as shown in FIG. 11, the expanding deformation part g is in a state of point contact or line contact with the hole edge of the through hole c, and the expanding deformation part g of the expansion deformation part g is removed every time when the elastic fitting of the male and female snaps is removed. Since the force is concentrated on the base, a crack k is finally generated at this portion, and the expansion deformation portion is caused by the force when the elastic fitting of the male and female snaps is removed and the force when the clothes are pulled. g
Is broken from the crack k, and the fitting member 1 and the rivet member a are broken.
And were sometimes separated.

In the above conventional example, the flexible sheet f is used.
When the projection b of the rivet member a driven from one side of the above is inserted into the through hole c, as shown in FIG. 12, a part of the flexible sheet f is dragged into the through hole c by the projection b. was there. This is a little problem for male snaps, but a very big problem for female snaps. That is, in the female snap, since the male fitting portion fits inside the female fitting portion to perform the snap action, a part of the flexible sheet f is fitted into the female fitting portion from the through hole c. When brought into the inside of the portion, the brought-in flexible sheet f becomes an obstacle and the substantial depth of the female fitting portion becomes shallow, and as a result, the female and male snaps are elastically fitted. It becomes impossible or incomplete and cannot function as a snap fastener.

[0008]

SUMMARY OF THE INVENTION The present invention has been made with the above points in mind, and its purpose is to use a relatively hard resin as the material for the rivet member, Expanding deformation by hitting the protruding tip of the protrusion can be easily performed, cracks can be prevented from occurring at the root of the protrusion, and further cracks can be prevented from occurring at the base of the expanding deforming portion. An object of the present invention is to provide a snap fastener that can improve the retaining function of the open deformation portion and reliably prevent the protrusion of the rivet member from dragging the flexible sheet into the through hole.

[0009]

The technical means taken by the present invention to achieve the above object are as follows.
That is, the feature of the present invention is that a rivet member having a synthetic resin substrate integrally formed with a synthetic resin projection having a circular cross section and a sharp projection in the center of the back surface of the synthetic resin substrate, and a synthetic resin having a through hole for inserting the projection. A rivet member that is driven from one side of a flexible sheet, and comprises a fitting member integrally formed with a male or female fitting portion projecting concentrically with the through hole on the surface of the substrate. In a snap fastener in which the protrusion is inserted into the through hole and the protruding tip end is expanded and deformed by striking to attach the fitting member to the flexible sheet, the through hole has a sharp upward spread. A small-diameter hole portion having an inclined reverse conical inner peripheral surface and an inner peripheral surface of a reverse cone shape having a gentler inclination than the inner peripheral surface of the small-diameter hole portion that is gently inclined upward from the upper end of the small diameter hole portion. With a large diameter hole,
The fitting member is formed in this order from the back surface side of the synthetic resin substrate, and the minimum inner diameter of the small diameter hole is formed to be slightly smaller than the diameter of the protrusion.

In addition, the above-mentioned protrusion has a solid structure,
In some cases, a hole is provided at the center of the protrusion from the tip to near the back surface of the synthetic resin substrate to prevent depression of the front surface side of the synthetic resin substrate due to "sinking" of the material resin.

[0011]

According to the above construction, the projection of the rivet member driven from one side of the flexible sheet is inserted into the through hole,
When the protruding tip is expanded and deformed by striking, it is deformed only to the position where it contacts the inverted conical inner peripheral surface of the large diameter hole, so even if a relatively hard resin is used as the material of the rivet member, This makes it possible to easily expand and deform the projection tip of the projection by striking it. As a result, when attaching the snap fastener, it is not necessary to apply a large force to the root of the projection, and cracks are prevented from occurring at this site. .

Moreover, in the state where the snap fastener is attached (the fitting member is attached to the flexible sheet), the expanding deformation portion of the projection makes surface contact with the inverted conical inner peripheral surface of the large diameter hole portion. , When pulling clothes with snap fasteners or removing the elastic fitting of male and female snaps, even if force is applied to the protrusions in the direction of pulling out, it will spread due to surface contact with the inner surface of the inverted cone. Since it acts in a distributed manner on the entire open deformation portion, it is possible to prevent cracks from being generated at the base of the expansion deformation portion.

Further, since the inner peripheral surface of the small diameter hole portion is formed in an inverted conical shape which is steeply upwardly expanded and the minimum inner diameter of the small diameter hole portion is formed to be slightly smaller than the diameter of the protrusion, it is flexible. When inserting the protrusion of the rivet member driven from one side of the flexible sheet into the through hole, the protrusion penetrates while opening the opening edge of the small diameter hole (minimum inner diameter) against the elastic restoring force of the material resin. On the other hand, the opening edge portion of the small-diameter hole portion is elastically deformed into a concomitant space caused by the inner cone having an upwardly conical inverted cone shape, and as a result,
The protrusion is inserted into the through hole while being handled by the opening edge portion (minimum inner diameter portion) of the small diameter hole portion, and thus the dragging of the flexible sheet into the through hole of the flexible sheet is reliably prevented.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. A shows a snap fastener composed of a male snap 1 and a female snap 2. The male snap 1 is a rivet member 5a in which a synthetic resin substrate 3a is integrally molded with a sharp synthetic resin projection 4a in the center of the back surface.
As shown in FIGS. 5 and 6, a male fitting portion projecting concentrically with the through hole 6a on the surface of the synthetic resin substrate 7a in which the through hole 6a for inserting the protrusion 4a is formed. 8a is composed of a fitting member 9a integrally formed, and the projection 4a of the rivet member 5a, which is driven from one side of the flexible sheet (for example, cloth for clothes) 10a, is inserted into the through hole 6a, and its projection The fitting member 9a is attached to the flexible sheet 10a by expanding and deforming the tip end portion by hitting.

Similarly, the female snap 2 has a rivet member 5b integrally formed with a projection 4b made of a synthetic resin having a circular cross-section and a sharp shape at the center of the back surface of the synthetic resin substrate 3b, as shown in FIG.
As shown in FIG. 4, a through hole 6b into which the protrusion 4b is inserted.
The through hole 6 is formed on the surface of the synthetic resin substrate 7b on which the holes are formed.
b and a fitting member 9b integrally formed with a male fitting portion 8b protruding concentrically, and the projection 4b of the rivet member 5b driven from one side of the flexible sheet 10b is provided with the through hole. The fitting member 9b is attached to the flexible sheet 10b by inserting the fitting member 9b into the flexible sheet 10b and expanding and deforming the projecting tip end portion by hitting. Reference numeral 11 is a reinforcing rib, which is arranged radially. Incidentally, the protrusions 4a, 4
Appropriate roundness is attached to each base of b.

In each of the through holes 6a and 6b, as shown in FIGS. 3 to 6, small diameter hole portions 12a and 12b having a reverse conical inner peripheral surface X that is steeply inclined upward and a small diameter are formed. Large-diameter holes 13a, 13b having a reverse conical inner peripheral surface Y with a gentler inclination than the inner peripheral surfaces X of the small-diameter hole portions 12a, 12b which are gently inclined upward from the upper ends of the hole portions 12a, 12b. Are formed in this order from the back surface side of the synthetic resin substrates 7a and 7b. The minimum inner diameters of the small diameter holes 12a and 12b (inner diameters of the opening edge portions) are rivet members 5a and 5b, respectively.
The diameter is set to be slightly smaller than the diameter of the protrusions 4a and 4b.

The back surfaces of the synthetic resin substrates 7a and 7b are formed perpendicularly to the central axes of the through holes 6a and 6b. Although not shown, an appropriate roundness may be added to the corner portion between the circular inner peripheral surface X and the inverted conical inner peripheral surface Y.

In the illustrated embodiment, the large-diameter hole portion 13b of the through hole 6b has an inner peripheral surface Y parallel to the circular inner peripheral surface X at the upper end of the inner peripheral surface Y of the inverted cone shape. However, this inner peripheral surface portion may be omitted. That is, the inverted conical inner peripheral surface Y has the through hole 6
The large-diameter hole portion 13b may be continuous to the upper end of b (the surface of the synthetic resin substrate 7b). In the illustrated embodiment,
Although the protrusions 4a and 4b each have a solid structure,
In some cases, a hole may be provided in the center of the protrusion from the tip to near the back surface of the synthetic resin substrate to prevent the sinking of the material resin on the front surface side of the synthetic resin substrate.

According to the above configuration, (a) in FIG.
As shown in (b), the rivet member 5b and the fitting member 8b are arranged on both sides of the flexible sheet 10b.
By pushing down, the projection 4b is penetrated through the flexible sheet 10b, and is inserted into the through hole 6b of the fitting member 8b. In this state, the protruding end of the projection 4b is struck by the hammer 14, and as shown in the drawing. The expansion deformation portion 15b has a large diameter hole portion 13.
In such a manner that the inner peripheral surface Y of the inverted cone of b is in surface contact,
The protruding tip portion is expanded and deformed. Incidentally, 14a shown in FIG. 7 is a recess formed in the center of the hammer 14,
At the time of striking, the tip of the protrusion 4b is fitted into the recess 14a and positioned, and in this state, the tip of the protrusion is crushed (expanded and deformed).

In this way, the projection 4b of the rivet member 5b driven from one side of the flexible sheet 10b is formed in the through hole 6.
When the rivet member 5b is inserted into the rivet member 5b and the projecting tip portion thereof is expanded and deformed by striking, the rivet member 5b is made of tenac. Even if a relatively hard resin such as a resin is used, it is possible to easily expand the deformation of the projection 4b by striking the projecting tip of the projection 4b with a small force, and when mounting the snap fastener A, a large base is formed at the base of the projection 4b. Since no force acts, the generation of cracks at this portion is prevented, and the cracking of the rivet member 5b (separation of the synthetic resin substrate 3b and the protrusion 4b) due to the cracks is prevented.

Moreover, when the snap fastener A is attached (the fitting member 8b is attached to the flexible sheet 10b), the expansion deformation portion 15b of the protrusion 4b has an inverted conical inner circumference of the large diameter hole portion 13b. Since it comes into surface contact with the surface Y, even when a force in the withdrawal direction acts on the protrusion 4b when the clothes with the snap fastener A is pulled or when the elastic fitting of the male and female snaps 1 and 2 is removed, It resists by the surface contact with the reverse conical inner peripheral surface Y and acts in a distributed manner on the entire expansion deforming portion 15b, so that cracks can be prevented from being generated at the root of the expanding deforming portion 15b. Unless the open deformation portion 15b is compressed to the inner diameter of the small diameter hole portion 12b, the through hole 6b
Since it does not come out of this, the retaining function of the expanding deformation portion 15b is significantly improved.

Although only the female snap 2 is shown in FIGS. 7 and 8, the rivet member 5a is also applicable to the male snap 1.
Since the relationship between the rivet member 5a and the fitting portion 8a is the same, even when a relatively hard resin such as tenac resin is used as the material of the rivet member 5a, the expansion deformation due to the impact of the projecting tip of the projection 4a is minimal. Riveting member 5
It is possible to prevent the occurrence of cracks at the base of a and prevent cracking of the rivet member 5a (separation between the synthetic resin substrate 3a and the protrusions 4a) due to the cracks, and to prevent the expansion deformation portion 15a of the protrusions 4a. By making surface contact with the inverted conical inner peripheral surface Y of the large-diameter hole portion 13a, even if a force in the withdrawal direction acts on the protrusion 4a, it is dispersed throughout the expansion deformation portion 15a, and the expansion deformation portion 15a It is the same as in the case of the female snap 2 that cracks can be prevented from being generated at the base and the retaining function of the expanding deformation portion 15a is significantly improved.

The same can be said for the female snap 2, but here, only the male snap 1, which has a great influence in securing the function as a snap fastener, will be described. In this embodiment, a small diameter hole is used. Part 12a
The inner peripheral surface X of the above is formed in an inverted conical shape that is steeply inclined upward, and the minimum inner diameter of the small diameter hole portion 12a is set to the above-mentioned projection 4a.
Since the projection 4a of the rivet member 5a driven from one side of the flexible sheet 10a is inserted into the through hole 6a, as shown in FIG. 9, the projection 4a has a small diameter. The opening edge portion (minimum inner diameter portion) of the portion 12a is inserted into the through hole while pushing and expanding against the elastic restoring force of the material resin. On the other hand, the opening edge portion of the small diameter hole portion 12a has an inner peripheral surface with an upward spread. The conical space is elastically deformed into a flexible space. Therefore, the protrusion 4a is inserted into the through hole 6a while being handled by the opening edge portion (minimum inner diameter portion) of the small diameter hole portion 12a.
It is possible to reliably prevent the flexible sheet 10a from being dragged into the through hole 6a due to a.

[0024]

As described above, according to the present invention, even when a relatively hard resin is used as the material of the rivet member, the expansion deformation due to the impact of the projecting tip of the projection can be easily performed, and the projection It is possible to prevent the occurrence of cracks at the base of the expansion deformation part, to prevent the occurrence of cracks at the base part of the expansion deformation part, and to improve the retaining function of the expansion deformation part, and moreover, the projection of the rivet member. It is possible to reliably prevent the flexible sheet from being dragged into the through hole.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a garment to which a snap fastener is attached.

FIG. 2 is a vertical sectional side view of a main part of a snap fastener.

FIG. 3 is a vertical sectional side view of a female snap fitting member.

FIG. 4 is a plan view of a female snap fitting member.

FIG. 5 is a vertical sectional side view of a male snap fitting member.

FIG. 6 is a plan view of a male snap fitting member.

FIG. 7 is an explanatory diagram of a method of attaching the snap fastener.

FIG. 8 is a vertical cross-sectional side view of a main part showing a joined state of the rivet-shaped member and the fitting member in the female snap.

FIG. 9 is a vertical cross-sectional side view of the main parts for explaining the operation.

FIG. 10 is an explanatory diagram of a conventional example.

FIG. 11 is an explanatory diagram of a conventional example.

FIG. 12 is an explanatory diagram of a conventional example.

[Explanation of symbols]

3a, 3b ... Substrate made of synthetic resin, 4a, 4b ... Protrusion, 5
a, 5b ... Rivet member, 6a, 6b ... Through hole, 7a,
7b ... Synthetic resin substrate, 8a, 8b ... Fitting portion, 9a, 9
b ... Fitting member, 10a, 10b ... Flexible sheet, 12
a, 12b ... small diameter hole portion, 13a, 13b ... large diameter hole portion, X
... a steeply sloped inverted conical inner peripheral surface, Y ... a gently sloped inverted conical inner peripheral surface.

Claims (1)

[Claims] 1. A rivet member having a synthetic resin substrate integrally formed with a protrusion made of a sharp synthetic resin having a circular cross section in the center of the back surface of the substrate, and a synthetic resin substrate having a through hole into which the protrusion is inserted. The fitting member integrally formed with a male or female fitting portion projecting concentrically with the through hole on the surface, and the projection of the rivet member driven from one side of the flexible sheet. In a snap fastener in which the fitting member is attached to a flexible sheet by inserting into the through hole and expanding and deforming the projecting tip end portion of the projecting end portion, the through hole has a reverse slope that is steeply upwardly expanded. A large diameter having a small-diameter hole portion having a conical inner peripheral surface and an inverted conical inner peripheral surface having a gentler inclination than the inner peripheral surface of the small-diameter hole portion gently sloping upward from the upper end of the small diameter hole portion. The hole and the synthetic resin base of the fitting member A snap fastener characterized in that it is formed in this order from the back side of the plate, and that the minimum inner diameter of the small diameter hole is formed slightly smaller than the diameter of the protrusion.