JPS6310730Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a rivet for a button, etc., in particular, the center part of the rivet is inserted under pressure into the hollow cylindrical part of the button main body, and the button main body and the rivet are crimped and fixed. Concerning rivets for buttons, etc.

Prior Art Buttons, for example buttons for jeans, are generally made by inserting the pillar part of the stud under pressure into the hollow cylindrical part of the button main body through clothing fabric, thereby deforming the tip of the pillar part and forming the hollow cylindrical part. However, it is desired that the tip of the column of the stud be smoothly curved and deformed in a predetermined direction so that it can be stably attached to the clothing fabric.

However, in conventional buttons, the tip of the column of the stud is shaped like a pyramid and this part is deformed, so when deformed, the sharp apex of the pyramid-shaped tip digs into the plate that is the main body of the button, resulting in deformation. The pressurizing force when tightening and fixing is concentrated on the top part, and the column part tilts from the base, bending the hollow cylindrical part that is the main body of the button, causing the button to tilt with respect to the fabric,
There were cases where the fastening of the button body and studs became loose. Furthermore, when the pyramid-shaped tip is curved and deformed, if the sharp edge of the tip comes into contact with the plate that mainly consists of the button, the corner edge bites into the plate.
On the other hand, if the flat side surface comes into contact with the plate, the contact area between the side surface and the plate will be large, and the sliding resistance will be large, causing the column to tilt more from the base and making the hollow cylinder that is the main body of the button larger. It deformed, and it was not possible to perform smooth caulking work.

Purpose of the invention The purpose of the invention is to provide a rivet for buttons, etc., in which the column part curves smoothly at the tip without tilting from the base, and is firmly and stably crimped and fixed to the main body of the button. .

Structure of the Device According to the present invention, the tip of the tapered shape of the column has an apex that is deviated from the center line of the column, and the tip is formed by plastic working below the deviated side of the apex. has a recessed part, the recessed part is
It is formed at a location that almost faces the outward bent portion formed at the upper end of the hollow cylinder portion of the button main body, and the surface of the tip portion located on the opposite side from this recessed portion is a curved surface,
The rivet is formed so that the top part is arc-shaped when viewed from the direction of the recess, and while sliding the arc-shaped top part of the tip part and the curved surface continuous thereto on the button main plate, the tip part of the top part is moved toward the recess part. This is achieved by creating a configuration that allows the transformation to occur.

Embodiments Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

The main body of the button shown in FIG. 1 includes a hollow body 2,
It is composed of a cap 3 fitted onto the body 2, and a plate 4 provided between the body 2 and the cap 3. Body 2 has a bottom 5 in the center of the interior.
It has a hollow cylindrical part 6 rising from the top, and has a dish-shaped flange part 7 on the outer upper end into which the cap 3 is fitted.

A sloped surface 9 is formed on the lower inner surface of the hollow cylindrical portion 6 on the side of the bottom 5 so that the rivet insertion hole 8 becomes wider toward the bottom 5, and an outwardly bent portion 10 is formed on the upper end. is formed. The bent portion 10 is
It extends outward, then extends downward and inward, and is bent into an arcuate cross-section, with the tip edge 11 located inside the maximum outer diameter d of the bending portion 10.

As shown in FIGS. 2 to 6, the stud 20 used in the button main body 1 has a disc-shaped head 21 and a column 22 extending from the center of the head 21. The head 21 has a plurality of small locking protrusions 24 formed on the surface 23 on the side of the column 22, and the surface 23
The surface 25 on the opposite side is a flat surface. Pillar part 2
2, the base located on the head 21 side has a cylindrical shape with approximately the same diameter as the stud insertion hole 8 of the button main body 1,
The distal end portion 22a has a tapered shape, and the top portion 26, which is the most distal end thereof, is slightly offset from the center line 27 of the columnar portion 22. Furthermore, the pillar portion 22 is
It has a recess 28 adjacent to the tip 22a, and an arcuate surface 29 at the end on the head 21 side.

The recess 28 is located along the center line 2 as shown in FIG.
It is located on the top 26 side, that is, on the deviated side with respect to 7, and is formed at a location that substantially faces the bent portion 10 of the button main body 1. Further, the recessed portion 2
8 is a punch (not shown) whose tip has a substantially truncated pyramid shape (i.e., ship bottom shape) with rounded corners.
Therefore, the recess 28 has a substantially truncated pyramid shape (that is, a boat bottom shape) with rounded corners, and as shown in FIG. is the recess 28
The bulge 30 is formed by plastic deformation of the material that existed in the area. Furthermore, the portion of the columnar portion 22 near the recess 28 becomes a hardened portion 31 that is harder than other portions because the recess 28 is formed by plastic working such as punching.

As is clear from FIGS. 2 to 4 and 6, the surface of the tapered tip portion 22a on the concave portion 28 side and the surface on the opposite side thereof are arcuate surfaces 4 bent in the outer circumferential direction.
0, 41, and a flat surface 42 following the arc surfaces 40, 41,
It is constituted by a combination of 43, 44, and 45. The boundary between the arc surface 40 and the flat surfaces 42, 43 and the boundary between the arc surface 41 and the flat surfaces 44, 45 are continuous surfaces without corners, and the flat surfaces 42,
The boundary between 43 and the flat surfaces 44 and 45 is a corner. The arc surface 40 is located above the recess 28, and the arc surface 41 is located on the opposite side to the arc surface 40. Further, the top portion 26 has an arc shape when viewed from the direction of the recess 28, as shown in FIG.

As shown in FIG.
The tip 22a of the column 22 is attached to the plate 4 by pressing the button body 1 and the stud 20 with a mounting machine or the like while the button body 1 is inserted into the stud insertion hole 8 of the hollow cylindrical portion 6 of the button body 1. By touching it and deforming it,
This deformable portion 34 is crimped and fixed to the bent portion 10 in a locked state.

According to this button, when the button main body 1 and the stud 20 are crimped and fixed, the arcuate top portion 26 of the stud 20 is aligned with the center line 27.
The recessed portion 2 is deviated from the arcuate top portion 26 and is hardened toward the lower side of the deviated side of the arcuate top portion 26, that is, toward the head 21 side.
8, the tip side of the column 22 is bent at a substantially right angle in the recess 28 to engage with the bent portion 10 of the button main body 1 without being tilted from the base. At this time, since the top part 26 is arcuate when viewed from the recess 28 side, the part that first contacts the plate 4 during crimping is at the center compared to when the top part 26 is arcuate when viewed from the side perpendicular to the recess 28. The tip is far away from the line 27, and the fact that the top 26 is arcuate and the recess 28 is formed ensures that the tip is bent toward the recess 28.

In addition, since the curved surface 41 of the stud 20 located on the opposite side of the recess 28 slides smoothly on the plate 4 following the arcuate top 26, the tip 22a is smoothly bent and the crimping operation is facilitated. On the other hand, the curved surface 41
If the part is a corner, this corner will dig into the plate 4, and unreasonable force will be applied to the column 22, making the tightening work troublesome and causing the column 22 to tilt from its base.

Furthermore, this stud 20 has a bulging part 30 around the recess 28, and the part near the recess 28 has been made into a hardened part 31 that is harder than other parts by plastic processing such as punching. Since the deformed portion 34 on the tip side of the column 22 becomes the recess 28 due to the bulge 30 and the recess 28, the mechanical strength near the recess 28 is large, and therefore the button main body 1 and the stud 20 are Even if a strong pulling force is applied, the column 2
The tip side of the button 2 does not deform in the direction of returning to its original state, and the stud 20 does not come off from the button main body 1.

On the other hand, this button has an arc surface 29 at the end of the column 22 on the head 21 side, so this end is reinforced.
The column part 22 does not incline with respect to the head part 21 when crimped and fixed. Further, since the stud 20 has a plurality of small locking protrusions 24 extending in the same direction as the column 22, the locking projections 24 are sunk into the fabric 33, and as a result, the stud 20 and the button rotate with respect to the fabric 33. There's nothing to do. Furthermore, the surface 25 of the head 21 of the stud 20
Since the head 21 is flat, the rivet 20 can be stably placed by bringing the surface 25 into contact with the die when placing the head 21 on the die of the crimping device.

Note that the recess 28 does not necessarily have to be in the shape of a ship's bottom, but may be in the shape of a pyramid, a cone, or the like.

Effects of the Invention As described above, in the present invention, the top of the column is deviated from the center line of the column, and a recess is formed by plastic working below the deviated side of the top, and the recess is It is formed at a location that almost faces the outward bent portion formed at the upper end of the hollow cylindrical portion of the button body, and the surface of the column located on the opposite side of this recessed portion is a curved surface, and the top portion is shaped like a recessed portion. Because it has an arc shape when viewed from the direction, the tip side of the column slides smoothly on the plate of the button body when crimping and fixing, deforming at an almost right angle in the recessed part, and forming the hollow part of the button body. There is no need to apply outward force to the upper end of the cylindrical portion to deform it.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of the button main body, Fig. 2 is a front view showing an example of the stud, Fig. 3 is a plan view of the stud, Fig. 4 is a left side view of Fig. 2, and Fig. 5 is a front view showing an example of the stud. The figures are a cross-sectional view taken along the line -- in FIG. 2, FIG. 6 is a cross-sectional view taken along the line -- in FIG. 2, and FIG. 7 is a cross-sectional view showing the state in which the button is attached. 1: Button main body, 6: Hollow cylinder part, 20: Stud, 21:
Head, 22: Pillar, 22a: Tip, 23,2
5: surface, 24: locking projection, 26: top, 27: center line, 28: recess, 29: arc surface, 30: bulge,
31: Hardened portion, 41: Curved surface.

Claims (1)

[Scope of utility model registration request] A button main body 1 with an outward bent portion 10 formed at the upper end
In the studs for buttons, etc., which are inserted into the hollow cylindrical portion 6 and fixed by caulking, the studs are attached to the column portion 22.
The center line 2 of the column 22 is aligned with the tapered tip 22a of the column 22.
7 and has an apex 26 offset from the apex 2
A recess 28 plastically worked below the deviated side of 6
The recess 28 has a bent portion 1 of the button main body 1.
0, the surface of the tip 22a located on the opposite side of the recess 28 is a curved surface 41, and the top 26 is arc-shaped when viewed from the direction of the recess 28. Studs for use.