JPH11270523A - Fastening pin and its fastening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a fastening pin used for fastening or connecting a plurality of object members, and its fastening structure. SOLUTION: A taper shaped lock part 3a whose tip end is gradually enlarged is arranged on a tip end of a fastening pin 1 composed of a head part 2 and a leg part 3, a ring shaped lock member 4 is plasticaly deformed for integratedly fixing the lock member 4 to the taper shaped lock part 3a, a plurality of fastening object members 5, 6 on which the leg part 3 is penetrated are held between the lock member 4 and the head part 2, and they are integratedly fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening pin used to fasten or connect a plurality of target members, and a fastening structure therefor.

[0002]

2. Description of the Related Art Generally, when a plurality of members are fastened, a rivet 10 as shown in FIG. 5 is used. The rivet 10 has a round bar-shaped leg 1 on the back surface of the head 10a.
0b, and the rivet holes 1 of the plurality of fastening target members 11, 12 as shown by the arrows in the legs 10b.
1a, 12a, the tip of the leg 10b protruding from the rivet holes 11a, 12a, using a hammer or the like,
As shown in FIG. 6, by crushing, the plurality of fastening target members 11 and 12 are fastened to prevent the rivet 10 from coming off.

Although not shown, bolts and nuts are also used to fasten a plurality of fastening members.

[0004]

The above-mentioned conventional rivet for fastening members is generally made of a relatively soft metal such as aluminum, copper or brass in order to crush the tip of the leg.

Therefore, it is relatively easy to use a hammer or the like to crush the tip of the leg of the rivet. However, when the rivets are used to connect the members rotatably, the strength of the rivet serving as a shaft is reduced. The rivet may be worn down with use and rattle with use, and in some cases, the rivet may come off.

On the other hand, if the rivet is hardened or the rivet is formed of a hard metal in order to secure the strength of the shaft, the operation of crushing the tip of the leg becomes difficult, and
In some cases, cracks occur in the legs at that time, and a problem has arisen that fastening of the members becomes impossible.

[0007] In the fastening using bolts and nuts,
Because it requires tools such as spanners and wrenches, it is difficult to fasten small items, and if it is used to connect rotating parts, it must be tightened with a double nut so that the nut does not loosen, The task becomes more difficult. Further, bolts and nuts have a higher unit price than rivets and are disadvantageous in terms of cost.

An object of the present invention is to solve the problems of the above-mentioned conventional rivets for fastening members and bolts and nuts.

[0009]

Means for Solving the Problems In order to solve the above problems, of the present invention, the invention according to claim 1 comprises a head,
A tapered locking portion that is continuous with the head and gradually increases in diameter toward the distal end forms a fastening pin with a leg provided at the distal end, and passes through a pin hole formed in a member to be fastened. The locking member is plastically deformed and fixed to the tapered locking portion at the distal end of the leg portion, so that the fastening pin is prevented from coming off from the fastened target member.

The invention according to a second aspect is characterized in that the material of the fastening pin according to the first aspect is limited to a ceramic or a hard metal material.

According to a third aspect of the present invention, the fastening pin according to the first aspect is limited to a pin formed of a soft metal and having at least legs hardened.

According to a fourth aspect of the present invention, there is provided a ring-shaped member formed of a soft metal material on a small-diameter neck provided at the tip of a leg of a fastening pin inserted through a pin hole formed in a member to be fastened. The locking member is plastically deformed and fitted, whereby the fastening pin is prevented from coming off by this locking member, and the members to be fastened are fastened to the head of the fastening pin. It is a characteristic fastening structure.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a side view of a fastening pin 1 according to the present invention. The fastening pin 1 includes a head 2 and a leg 3, and is provided with a tapered locking portion 3 a at the tip of the leg 3. In the tapered locking portion 3a, the diameter B at the distal end (right side in FIG. 1) is equal to or slightly smaller than the diameter A of the leg portion 3, and gradually increases toward the base end side of the leg portion 3 (left side in FIG. 1). And a narrow neck portion 3b having a diameter C is formed.

The fastening pin 1 is made of a hard material such as hard metal or ceramic so as not to be easily deformed.

The fastening pin 1 may be formed by cutting the tip of an ordinary pin or rivet whose leg is a round bar. In this case, if the material of the pin or the rivet is soft, it is necessary to harden at least the legs to harden.

FIG. 2 is a perspective view of the locking member 4 used to prevent the fastening pin 1 from coming off. This locking member 4
Is formed of a deformable metal material in a ring shape, and has an inner diameter D outside the tip of the tapered locking portion 3a so that it can be inserted into the tapered locking portion 3a at the tip of the fastening pin 1. The diameter is set to be equal to or slightly larger than the diameter B. The thickness t of the tapered locking portion 3
It is set slightly larger than the length L of a.

Next, a procedure for fastening the members 5 and 6 to be fastened using the fastening pin 1 will be described.

First, a plurality of members to be fastened 5 and 6 to be fastened are overlapped with pin holes 5a and 6a formed in advance at predetermined positions of the members 5 and 6 to be fastened. Then, as shown in FIG. 3, the leg 3a of the fastening pin 1 is inserted from one of the pin holes 5a, 6a (left side in FIG. 3), and the other side of the pin holes 5a, 6a (right side in FIG. 3). The ring-shaped locking member 4 is inserted into the tapered locking portion 3a projecting from the side). Then, in this state, the fastening pin 1
The outer end surface of the locking member 4 is hit with a hammer or the like as shown by an arrow in FIG. 3 while restricting the head 2 with a backing plate (not shown) or the like so as not to come off. As a result, the locking member 4 formed of a relatively soft metal material
As shown in FIG. 4, the inner peripheral portion of the crushed neck 3 has a small diameter.
b and is integrally connected to the tapered locking portion 3a. Therefore, the fastening pin 1 is prevented from coming off by the locking member 4 and the plurality of fastening target members 5, 6 which are superimposed.
To conclude.

Thus, in the fastening structure using the fastening pin 1 of the present invention, the neck 3b at the tip of the fastening pin 1 is
When the locking member formed of a soft metal material is plastically deformed and fitted, the locking pin 1 is prevented from coming off, and the plurality of members 5 and 6 to be fastened are integrally fastened.

In the above embodiment, an example is shown in which the locking member 4 is plastically deformed by hitting the outer end face of the locking member 4 and attached to the locking portion 3a of the fastening pin 1. Alternatively, the locking member 4 may be crushed by tightening its outer periphery with a tool or the like, so that the locking portion 3a is hardly inserted.

In the fastening structure of the present invention, the fastening pin 1
It is sufficient that the locking member 4 is plastically deformed and fixed to the tip of the fixing pin 1 so as to prevent the fastening pin 1 from coming out. Instead, any tapered shape having a small diameter neck (including a grooved shape) may be used.

[0023]

As described above, according to the first aspect of the present invention, in the present invention, a tapered locking portion whose diameter is increased toward the distal end is provided at the distal end of the fastening pin, Since the locking member, which serves as a retaining member, is plastically deformed and fixed to the locking part, the fastening operation can be easily performed using a hammer, etc., compared to the conventional fastening with bolts and nuts. Once the bolts and nuts are fastened, there is no risk of loosening like bolts and nuts, and the unit price is lower than that of bolts and nuts.

According to the second aspect of the present invention, since the above-mentioned fastening pin is formed of a ceramic or hard metal material, the strength of the fastening portion is improved, and the fastening pin is used for fastening the rotating portion. Even when used, there is an effect that the wear is small and the durability is improved.

According to the third aspect of the present invention, the fastening pin is formed of a soft metal material and the legs are hardened by quenching. Therefore, the effects of the first and second aspects of the present invention are provided. Can be easily formed by processing an existing pin or rivet, and the manufacturing equipment thereof can be continuously used as it is. Therefore,
There is an effect that the fastening pin of the present invention can be implemented easily at low cost.

According to a fourth aspect of the present invention, a fastening structure in which a locking member is plastically deformed and integrally fixed to the tip of a fastening pin so as to prevent the fastening pin from coming off allows a narrow neck portion to be formed at the tip. There is an effect that the members to be fastened can be easily and reliably fastened using the provided fastening pins.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a fastening pin of the present invention.

FIG. 2 is a perspective view of a locking member fixed to the fastening pin of the present invention.

FIG. 3 is a cross-sectional view showing a state before fastening members using the fastening pins of the present invention.

FIG. 4 is a cross-sectional view of a member fastening state using the fastening pin of the present invention.

FIG. 5 is a side view of a conventional example before a member is fastened.

FIG. 6 is a side view of a conventional example in which members are fastened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastening pin 2 Head 3 Leg 3a Tapered locking part 3b Neck 4 Locking member 5,6 Fastening target member 5a, 6a Pin hole

Claims (4)

[Claims] 1. A head member, and a tapered locking portion, which is continuous with the head and gradually increases in diameter toward the distal end, comprises a leg provided at the distal end, and is formed on the member to be fastened. A fastening pin, characterized in that the locking member is plastically deformed and fixed to the tapered locking portion at the distal end of the leg portion through which the pin hole is inserted, so that the locking member is prevented from coming off from the fastened target member. . 2. The fastening pin according to claim 1, wherein the fastening pin is formed of a ceramic or a hard metal material. 3. The fastening pin according to claim 1, wherein the pin is formed of a soft metal material and at least the leg is hardened. 4. A ring-shaped locking member made of a soft metal material is plastically attached to a small-diameter neck provided at a tip of a leg of a fastening pin inserted through a pin hole formed in a member to be fastened. The fastening structure is characterized in that the fastening pin is prevented from coming off by the locking member by being deformed and fitted, and the fastening target members are fastened to the head of the fastening pin. .