JPH1147865A - Rivet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rivet wherein the fitting root part of a needle-like leg body is reinforced so as not to excessively bend and moreover the needle-like leg body is surely fixed and held so as not to easily slip out of the body. SOLUTION: A needle-like body 2 with a stepped projecting part 7 wherein the diameter of a base end part 5 is stepwise increased and a base body 3 having the inserting groove hole 6 with a stepped recessed part 8 whose diameter is stepwise decreased so as to lock the large diameter part of the needle-like leg body 2 are respectively formed. In this case, the step angle at the stepped projecting part 7 is made larger (90 deg.C) than the step angle at the stepped recessed part 8. Next, the leg part 4 of the needle-like leg body 2 is inserted from the large diameter side of the inserting groove hole 6 in the base body 3, the stepped recessed part 8 is pushed outside with the stepped projecting part 7 to form a buildup reinforced part 10 in the outlet side edge part at the inserting groove hole 6, whereby the rivet 1 is formed where the needle-like leg body 2 and the base body 3 are joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tacks and a method for manufacturing the same, and more particularly, to a stud where a mounting base portion of a needle-like leg is reinforced without being bent unnecessarily, and
The present invention relates to a thumbtack such as a thumbtack, a pin badge, and the like, and a method for manufacturing the same, in which the needle-like leg is securely fixed and held without being unintentionally pulled out of the base.

[0002]

2. Description of the Related Art As shown in FIG. 3, a means for attaching a needle-like leg to a base in a tack is to attach a base end (25) of the needle-like leg (22) to the back side of the base (23). , And the attachment base portion is joined by using an attachment member (29) such as brazing or solder to form a stud (21), or as shown in FIG. (32) has a disk-shaped head (37) formed at a base end (35), and a base groove (33) formed by bending a base (33) at an edge thereof. 36) is formed on the back side, the head (37) is arranged in the step groove (36), and then the bending and locking piece (38) is bent to form the bending and locking piece (38). With the head (3
7) is known in which a tack (31) is formed by locking and joining.

[0003] However, in the above-described means, a small part of the base end of the needle-like leg is held down by using an attachment member such as solder, solder, or a bending-locking piece, so that members that are separate from each other are held together. Because it is made to join, when force is applied to the needle-like leg from the lateral direction,
Since the force for holding the needle-like leg against the base is weak, the needle-like leg may be easily bent from the mounting base. That is, since the base end portion of the needle-like leg is joined in a state where it is placed near the back surface of the base, the direction of the joint surface between the needle-like leg and the base is added from the side. In the same direction as the direction of the stress, the needle-like leg itself may be peeled off from the joint rather than being bent.

Therefore, as shown in FIG. 5, the diameter of the needle-like leg (42) is slightly smaller than that of the needle-like leg (42) so as to prevent the needle-like leg from being inadvertently peeled off from the joint portion with the base. The base (4) having an insertion hole (46) having a diameter
The needle-like leg (42) is inserted through 3), and the needle-like leg (4) is inserted.
Insert the base end (45) of the base (43) into the insertion hole (4) of the base (43).
6) The studs (41) are formed by tightly accommodating and joining the insides with the press contact force, so that the direction of the joint surface between the needle-shaped legs and the base is applied to the needle-shaped legs. It is conceivable to join them in a direction different from the above, that is, in a direction orthogonal to the direction of the stress.

[0005]

However, the above-mentioned means surely removes the needle-like leg from the joint with the base and securely holds the needle-like leg without bending. On the other hand, the stress applied from the side is concentrated at the contact boundary surface between the base and the needle-shaped legs, that is, at the base of the needle-shaped legs in contact with the insertion hole exit side edge of the base. The root of the needle-shaped leg itself is easily bent. Further, since the needle-like leg is joined to the base body only by the pressing force of the base end portion, when the distal end side of the needle-like leg body is pressed, the needle-like leg body comes out of the base body carelessly. There is fear.

[0006]

According to the present invention, in order to cope with such a problem, the joint between the base and the needle-like leg is different from the direction of the stress applied to the needle-like leg. The needle-like leg is bonded to the base with the bonding surface in the direction as described above, and the stress applied from the side at the contact boundary surface with the needle-like leg in the base is dispersed, and the needle is The configuration is such that the frictional resistance between the needle-like leg and the base increases with respect to the pressing from the tip end side of the leg-like leg, so that it is difficult for the needle-like leg to come off.

As described above, when the needle-like leg is joined to the base with a joint surface in a direction different from the direction of the stress applied to the needle-like leg, the base and the needle-like leg can be joined. Since the stress is applied to the needle-shaped legs themselves, not to the joints with the base, the needle-shaped legs are taken off so as to be peeled off from the joints to the base, and are securely fixed and held without being bent. The stress applied from the side is dispersed at the contact boundary surface of the base with the needle-shaped leg, and the needle-shaped leg and the needle-shaped leg are pressed against from the tip side of the needle-shaped leg. When the frictional resistance with the base is configured to be increased, even if stress is applied to the needle-shaped leg itself, stress is not applied to one location concentrated on the corresponding boundary surface portion, The root can be easily bent In addition, the frictional force at the contact boundary surface between the base and the needle-like leg is added to the bonding force between the base and the base end of the needle-like leg, and the needle-like leg is further strongly strengthened. It is possible to prevent the liquid from being inadvertently pulled out by being fixedly held on the base.

[0008] Here, the tacks referred to in the present invention include pushpins, company badges and school badges indicating the group or class to which the user belongs, pin badges displaying characters and the like, and buttons and brooches. It has a needle-like leg including an ornament.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a needle-like leg having a step-like convex portion having a base end portion having a stepwise large diameter, and locking the large-diameter portion of the needle-like leg. And a base having an insertion groove formed with a step-shaped concave portion having a stepwise small diameter, wherein the step angle of the step-shaped convex portion of the needle-like leg is larger than the step angle of the step-shaped concave portion of the base. Then, by inserting the needle-like leg from the large-diameter side of the insertion slot in the base and pressing the base end, the step-shaped projection presses the step-shaped recess to insert the insertion slot in the base. Is formed by forming a swelling reinforcing portion at the edge of the outlet side and attaching the needle-like leg to the base.

As described above, a step-like convex portion having a stepwise large diameter is provided at the base end portion of the needle-like leg, and the step-like projection is formed so as to lock the large-diameter portion of the needle-like leg. If the base is provided with an insertion groove formed with a stepped recess having a small diameter, the base end of the needle-like leg is securely caught in the insertion groove in the base without falling out of the outlet side. And is joined to the substrate with a joining surface in a direction different from the direction of the stress applied from the side. In addition, since the step angle of the step-shaped projection of the needle-shaped leg is larger than the step angle of the step-shaped depression of the base, a part of the step-shaped depression pressed by the step-shaped projection having a large step angle. Is extruded toward the exit side of the insertion slot, and swells at the exit side edge of the base to form a reinforcing portion, and covers the root portion of the needle-like leg more toward the tip side to prevent bending, and When the leg-shaped member tries to move in the withdrawal direction, the bulging reinforcing portion contracts, so that it comes into contact with the needle-shaped leg with a strong frictional force. Is prevented from accidentally exiting.

The step angle of the step-shaped projection and the step angle of the step-shaped depression may be pushed when the step angle of the step-shaped projection is larger than 90 ° and the step angle of the step-shaped depression is approximately 90 °. As a result, the stepped concave portion having no place to go can be easily pushed out so as to escape toward the exit side of the insertion slot, which can be more preferable.

According to the invention of the present application, basically, a swelling reinforcing portion for reinforcing and protecting the root portion of the needle-like leg may be formed at the outlet side edge of the base body. As described above, the step angle at the step-shaped convex portion of the needle-shaped leg is not limited to the step angle made larger than the step angle at the step-shaped concave portion of the base, and corresponds to a step angle larger than the step-shaped concave portion. The stepped portion is constituted by an annular member separate from the step-shaped convex portion, and the annular member is interposed between the step-shaped concave portion and the step-shaped convex portion and sandwiched therebetween, so that the step angle substantially larger than the step-shaped concave portion. Of course, the same action as the step-shaped convex portion having the above-mentioned is included.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The present invention can be formed from a metal material such as iron, zinc, or brass, and as shown in FIG. 1, a step-like projection (7) in which a base end (5) has a step-likely large diameter. And an insertion groove formed with a stepped concave portion (8) having a stepwise small diameter so as to lock a large part of the diameter of the needlelike leg (2). A stepped projection (7) of the needle-like leg (2), which is formed by combining a base (3) having a hole (6).
Is larger than the step angle (β) in the stepped concave portion (8) of the base (3) (see FIG. 2), and the diameter of the insertion slot (6) in the base (3) is large. By inserting the leg (4) of the needle-like leg (2) from the side and pressing the base end (5), the step-shaped protrusion (7) causes the step-shaped recess (8) to be formed. The needle-like leg body (3) is extruded toward the back side of the base (3), that is, toward the outlet side of the insertion slot (6), and swells at the edge of the insertion slot (6) on the outlet side to form a reinforcing portion (10). 2) and the base (3) are joined to form a stud (1) (see FIG. 2 (b)).

The needle leg (2) has a leg (4) having a diameter of 1..
0 mm, the diameter of the base end portion (5), which becomes larger stepwise, is 1.3.
mm, and a step angle (α) in the step-shaped convex portion (7) is slightly larger than 90 °, and is a rod-shaped analog having an inclined surface rising toward the leg (4) side. It is formed by a rod. On the other hand, the base (3)
Is a hole having a large diameter of about 1.2 mm at which the base end (5) of the needle-shaped leg (2) is pressed into contact with the base, and a base having a stepwise smaller diameter. A step in a stepped recess (8) having an insertion groove (6) formed of a hole having a diameter as small as 1.1 mm in which (5) is locked in the middle and only the leg (4) can be inserted; It is made of a zinc plate having an angle (β) of about 90 °.

The step angle of the step-shaped convex portion and the step angle of the step-shaped concave portion are set so that the step-shaped convex portion pushes the step-shaped concave portion slightly outward. May be formed so as to be larger than the step angle in the step-shaped concave portion, but the step angle in the step-shaped convex portion is approximately 90 °, and the step angle in the step-shaped concave portion is smaller than 90 °, If the step angle in the step-like convex part is considerably larger than 90 ° and the step angle in the step-like concave part is slightly larger than 90 °, the bulges at the exit side edge of the insertion slot and the reinforcing part is not formed well. As described above, it is difficult to form the step-shaped portion, or the strength of the step-shaped protrusion or the step-shaped recess may be reduced and the step-shaped protrusion may be easily damaged.゜Ri slightly larger, and who stage angle in stepwise concave portion was made to approximately 90 ° is preferred.

[0016]

The studs according to the present invention constructed as described above are reinforced by covering the base portion of the needle-like leg with the deformed exit side edge of the insertion slot in the base, and at the same time, the needle-like shape. Since the stress applied to the leg is dispersed, the root of the needle-shaped leg can be prevented from being easily bent.

Further, since the needle-shaped leg is locked by the pressure contact force between the base end portion and the large-diameter hole of the base, the needle-like leg can be securely attached to the base without using an attachment member such as an adhesive. It will be fixedly held.

Furthermore, the deformed outlet side edge of the insertion slot in the base, which reinforces the base of the needle-like leg, is deformed like a leaf spring by being pushed out from the inside. When the leg-shaped body tries to move in the exit direction, the deformed outlet side edge abuts on the needle-shaped leg with a strong frictional force and is pinched, thereby preventing the needle-shaped leg from accidentally falling out. Things.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views before and after combination, respectively, showing the structure of tacks according to the present invention.

FIG. 2 is an enlarged schematic diagram illustrating a step angle in the present invention.

FIGS. 3A and 3B are cross-sectional views before and after combination, respectively, showing the structure of tacks according to the related art.

FIGS. 4A and 4B are cross-sectional views before and after combination, respectively, showing the structure of another conventional stud.

5A and 5B are cross-sectional views before and after combination, respectively, showing the structures of other tacks of the related art.

[Explanation of symbols]

 α: step angle on the side of the step-shaped convex portion β: step angle on the side of the step-shaped concave portion 1 ... stud 2 ... needle-like leg 3 ... base 4 ... leg 5 ... group End 6: insertion slot 7: step-shaped projection 8: step-shaped recess 10: bulging reinforcement 29: mounting member 36: step groove 37: head 38 ... Bend locking pieces

Claims (3)

[Claims] 1. A needle-like leg having a step-like convex portion whose base end portion has a step-like increase in diameter, and a step-like diameter so as to lock a large-diameter portion of the needle-like leg. A base having an insertion slot formed with a small step-shaped recess, wherein the step angle of the step-shaped projection of the needle-shaped leg is larger than the step angle of the step-shaped recess of the base, and The needle-like leg is inserted into the insertion slot, and the step-shaped concave portion is pushed out by the step-shaped convex portion, so that a swelling reinforcing portion is formed at an insertion-portion-side edge of the base. And tacks. 2. The step angle of the step-like convex portion is larger than 90 °,
The studs according to claim 1, wherein the step angle of the stepped concave portion is approximately 90 °. 3. A leg of a needle-like leg having a step-like convex portion whose base end is stepwise increased in diameter so that a large-diameter portion of the needle-like leg can be locked. The base having a through-hole formed with a step-shaped concave portion having a stepwise small diameter is inserted from the large-diameter side of the through-hole into the base to press the base end portion, whereby the step-like convex portion is used. A method for manufacturing studs, comprising extruding a stepped concave portion to form a swelling portion at an exit side edge of an insertion slot in the base to form a reinforcing portion, and attaching the needle-like leg to the base.