Snap fastener

Abstract

To provide a synthetic resin snap fastener that can adjust maintenance force at the time of fitting of a synthetic resin snap fastener to be weakened stepwise with easy and safe processing.SOLUTION: A snap fastener is provided with one or more pre-cut-off process thin wall parts 3 which have thinned material thickness and are recessed and provided in a male-member cylindrical projection part 1 of a male member A. Cutting off the pre-cut-off process thin wall parts 3 that is recessed can safely and readily generate a post-cut-off process slit 4 that has a stable size. When a post-cut-off process slit 4 is produced, the male-member cylindrical projection part 1 of the male member A becomes being likely to deform in a central direction of a circumference of the male-member cylindrical projection part 1 at the time of disconnecting the fitting to a female member B, thereby adjusting maintenance force at the time of being fitted to the female member B to be weakened stepwise and weakening the force required in detachment. Increasing the depth and the number of the post-cut-off process slits 4 can adjust the maintenance force to a desired force at the time of being fitted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a snap button used as a fastener for fastening clothing, etc., and relates to a synthetic resin snap fastener formed of a male member and a female member. As shown in Figure 11, a ring-shaped male member curved bulge 2 is formed on the outer periphery of the upper outer end of the male member cylindrical protrusion 1 of the male member A, and a ring-shaped female member curved bulge 6 is formed on the inner edge of the recess 5 inside the female member of the female member B, so that when fitted and attached, the male member curved bulge 2 of the male member A and the female member curved bulge 6 of the female member B are engaged with each other with a retaining force that prevents them from coming off. [Background technology]

[0002] Snap fasteners such as those described in Patent Document 1 are widely known, which are designed to form grooves at the mating parts of the male and female components to facilitate the snap action (engagement and disengagement of the male and female components). However, the retention force when fitted and attached cannot be changed, and the retention force cannot be weakened as desired by the user, for example when used on thin and weak fabrics. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4172866 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional synthetic resin snap fasteners have a constant retention force when fitted and the user cannot weaken the retention force. The present invention, which has the characteristic of being able to adjust the retention force when fitted, can be provided as a versatile synthetic resin snap fastener by weakening the retention force of a single type of snap fastener. As an example, if a user feels that the retention strength of a synthetic resin snap fastener when fitting is too strong for the material of the fabric used, such as underwear for infants, the retention strength can be gradually weakened by creating a slit until the desired strength is reached. Furthermore, it is difficult to create a stable slit simply by cutting into the male member cylindrical protrusion 1 of the male member A with a cutter knife or scissors, and there is a problem that the member may be deformed during the processing stage, but the present invention makes it possible to safely and easily process a stable slit. [Means for solving the problem]

[0005] The synthetic resin snap fastener of the present invention has one or more recessed thin-walled portions 3 in which the material is thinned before cutting on the male member cylindrical protrusion 1 of the male member A, and by cutting off the recessed thin-walled portions 3, it is possible to easily and safely create slits 4 of a stable size after cutting. Effect of the Invention

[0006] In the present invention, by cutting out the recessed thin-walled portion 3 before cutting out provided on the male member cylindrical protrusion 1 of the male member A of the snap fastener, any number of slits 4 after cutting out are created, which makes it easier for the male member cylindrical protrusion 1 of the male member A to deform when mating with or releasing from the female member B. Therefore, by increasing the number of slits 4 after cutting out, it is possible to adjust the mating attachment retention force between the male member A and the female member B to a desired retention force. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a male member A of a snap fastener according to the present invention; [Diagram 2] FIG. 2 is a top view of the male member A. [Diagram 3] 3 is a cross-sectional view taken along line aa in FIG. 2. [Figure 4] FIG. 2 is a side view of the male member A. [Diagram 5]FIG. 2 is an enlarged view of a recessed thin-walled portion 3 in FIG. 1 before cutting out. [Figure 6] FIG. 2 is an enlarged view of the slit 4 after cutting in FIG. [Figure 7] FIG. [Figure 8] 8 is a cross-sectional view taken along line b-b in FIG. 7. [Figure 9] FIG. 2 is a side view of the female member B. [Figure 10] FIG. 2 is a side view of the rivet-like member C. [Figure 11] 4A to 4C are cross-sectional views showing how each member is used. [Figure 12] 1 is a cross-sectional view of a male member A and a female member B when they are fitted together. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In Fig. 1, one or more recessed thin-walled portions 3 before cutting are provided on a male member cylindrical protrusion 1 including a male member curved bulge 2 of a male member A. The number and width can be changed depending on the synthetic resin material used.

[0009] As shown in Figure 2, the thickness of the recessed thin-walled portion 3 before cutting is intended to be a guide for the cutting operation, and is considered not to affect the strength of the male member cylindrical protruding portion 1. In some cases, the outer edge of the male member circular plate portion 10 may be provided with projections and recesses to serve as markers for the position during the cutting operation.

[0010] As shown in FIG. 4, in consideration of the safety of the cutting process, the length of the recessed thin-walled portion 3 before the cutting process and the length of the slit 4 after the cutting process can be changed depending on the material, and in this embodiment, they are set to about the height of the outer edge of the male component circular plate portion 10.

[0011] FIG. 5 shows the recessed thin-walled portion 3 before cutting out, and a tool is used to cut out the recess.

[0012] Figure 6 shows the slit 4 after cutting out. Since the recessed thin-walled portion 3 is machined to a smooth surface before cutting out, the edges of the slit 4 after cutting out are smooth and safe.

[0013] 7, 8 and 9 show the female member B. This embodiment is characterized in that the retention force during fitting can be weakened, so the initial strength of the retention force during initial fitting can be freely set.

[0014] 11 and 12 explain how to use the snap fastener. The protruding portion 8 of the rivet-like member C penetrates the fabric D1 and passes through the through hole 7 in the center of the male member circular plate portion 10 of the male member A, and the protruding portion 8 of the rivet-like member is crushed using a snap fastener attachment tool made of synthetic resin to form the retaining portion 9, and the snap fastener is attached to the fabric. The rivet-like member C, fabric D2, and female member B are attached in the same manner.

[0015] The pre-cut recessed thin portion 3 can be cut away to create the post-cut slit 4 either before or after the snap fastener is attached to the fabric. [Explanation of symbols]

[0016] A Male member B Female part C Rivet-like member D1 Fabric D2 Fabric 1 Male member cylindrical protrusion 2 Male member curved bulge 3. Thin-walled recess before cutting 4 Slits after cutting 5 Recess inside female component 6 Female member curved bulge 7 Through hole 8. Protruding portion of rivet-like member 9 The protruding part was crushed and became the retaining part. 10 Male member circular plate portion

Claims

[Claim 1] A snap fastener made of synthetic resin, characterized in that a male member (A) has a male member circular plate portion (10) with a through hole (7) formed in the center for inserting a protruding portion (8) of a rivet-like member (C) and a male member tubular protruding portion (1) with a male member curved bulge portion (2) formed on the upper end outer periphery, and one or more pre-cutout recessed thin-walled portions (3) are provided along the protruding direction of the male member tubular protruding portion (1), and the pre-cutout recessed thin-walled portions (3) can be cut to form slits (4) after cutting.

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