JPS6014204B2 - Manufacturing method for connecting fasteners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be loaded into a fastener driving tool such as a nailer,
Connected fasteners (hereinafter referred to as connected fasteners) are separated one by one and driven into the material to be driven by a driving driver that reciprocates inside a cylindrical nose provided on the tool body.

) is particularly applicable to those in which each of the above-mentioned fasteners is made of metal. Conventionally, this type of connected fastener has been widely used because it allows a large number of fasteners to be arranged in parallel at regular intervals and loaded into a driving tool in advance. Conventionally, there are fasteners in which, for example, a large number of nails are connected in parallel at regular intervals by connecting one side of the body of the nails with a metal wire.

By the way, in the method of manufacturing the connecting nails having the above structure, the wires have to be spot welded and fixed to 8 identical parts of each nail, which is difficult to work with and takes time and effort in mass production. there were.

Furthermore, the welding described above destroys the tissue of the welded portion of the chest of the nail, causing changes in the material, leaving problems with the durability of the nail. In addition, since the wire used has a small diameter, the connecting portion between adjacent nails in the wire may be bent when loading it into the magazine of a nail gun, for example. There are many cases where it is not possible to feed the nails smoothly when feeding them out of the magazine. Furthermore, if the bending is large, the wire may break at the welded part of the chest of the nail, and the reality is that a stable connection is not always achieved. Therefore, in recent years, in order to eliminate the drawbacks caused by the wire connection,
A manufacturing method has been devised in which a large number of nails are connected using a plastic connecting material formed in the shape of a highly hard band.

By the way, in the conventional manufacturing method described above, although it is excellent for mass production, both ears of each nail are sandwiched between two band-shaped connecting members, so that they do not engage with the nail. The amount of continuous material used is large, leading to increased costs.

Furthermore, since the amount of the continuous striped material is large, the volume of the connecting material hitting the nail surface when driving the nail becomes large, resulting in a large shear stress and a large driving resistance. Therefore, there is a drawback that the nail is not driven in enough. Furthermore, the amount of the connecting material scattered during nail driving increased, resulting in poor nail driving workability. In addition, since each of the nails is simply held between the connecting materials, the nails often slide in the axial direction, and a stable connection is not always achieved. It is. Therefore, the present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and is excellent in mass production, can keep the amount of connecting material to the minimum necessary, and provides strong and stable connection of each fastener. The purpose of this study is to propose a method for manufacturing a new connecting fastener that can obtain the following conditions.

Another object of the present invention is to suppress changes in material properties due to heating during connection of fasteners to the necessary minimum.

The gist of the present invention is to form a connecting member for connecting a large number of metal fasteners into a long shape using a resin that has thermal adhesive properties to metal, and to use each of the above-mentioned fasteners as a resistor to conduct electric current. a step of heating the fastener by pouring water into the fastener; a step of relatively pressing one side of the heated main body of the fastener with a negative side surface of the connecting member; and placing each fastener at a constant interval in the longitudinal direction of the connecting member. The method is characterized in that it consists of a step of placing and arranging them in parallel.

Hereinafter, preferred embodiments of the present invention will be specifically described based on the drawings.

1 and 2 are diagrams showing an example of a connecting nail constructed by the manufacturing method of the present invention, FIG. 1 is a partially omitted front view showing the connected state of the nail, and FIG. It is a sectional view taken along the line A-A.

As an example of a connecting fastener, each nail 2 of the connecting nail 1, 2...
. . . is a flat circular head 3, an axial ear portion 4 following this head 3, and a foot portion 6 formed at an acute angle at the tip of this body 4.
It is composed of. And each of the above nails 2, 2...
In one side 4A of the chest 4 of . Connecting materials 6, 6 formed in a narrow band shape are fixed with a resin having thermal adhesive properties to metal such as a graft polymer resin of carbon fiber and unsaturated carboxylic acid, etc.), and each of these nails 2, 2... It is constructed by connecting and arranging ``...'' in parallel at regular intervals.

The nails 2, 2, . . . are connected with the body portions 4 slightly biting into the negative sides 6A, 6A of the connecting members 6, 6. Next, an example of a method for manufacturing the connecting nail 1 having the above structure will be explained with reference to FIG.

A heating device 20 for heating each of the nails 2, 2, . The nail holding body 22, 22 has a high conductivity, and the nail 2 is held between the above-mentioned holding bodies 22, 22.
are held in an upright state, and each of the above-mentioned support rods 2 is connected via the nails 2.
The nail 2 is instantaneously heated by passing a current between the nails 1 and 21.

That is, since the nail 2 held upright between the clamping bodies 22 and 22 becomes a resistor when current is supplied, Joule heat is generated in the nail 2 and the nail 2 is heated.

First, a rectangular window portion 12 into which a nail feeding claw of a nail gun (not shown) is inserted and engaged in a portion between each nail 2, 2, . . . adjacent to each holding body 22 of the heating device 20, 12...
・is formed. Each of the nails 2, 2, . This constitutes a connecting nail '0'. As is clear from the above description, according to the present invention ~
The main body part of the fastener and the connecting material can be fixed together simply by applying relative pressure to one side of the heated main body part of the fastener and one side of the connecting material.It is simple and easy to manufacture, and is excellent for mass production. Cost reduction can be achieved.

Furthermore, according to the present invention, the hardening of the fastener can be performed at the same time as the process of connecting it to the connecting member, making manufacturing easier than before.

Furthermore, according to the present invention, it is possible to instantaneously heat the fastener, thereby speeding up the heating process of the fastener, and minimizing changes in the material of the fastener due to heating.

Further, since the main body portion of the fastener and the connecting member are in a fixed state, each fastener does not slide in the axial direction after being connected, and a stable connected state can be obtained.

In addition, due to the characteristics of the material, the connecting material used in the present invention becomes hard when it is cooled after manufacturing. A strong connected state of the fasteners can be obtained without any problems.In addition, since each fastener can be connected only on one side of the main body of the fastener, the amount of connecting material in the connected fasteners can be kept to the minimum amount necessary for connection. Since the shear stress and driving resistance during driving of the fastener can be reduced, the fastener can be reliably driven to the end into the material to be driven.

In addition, the amount of the connecting material hitting the surface of the field to be driven and being scattered is small, and the connecting nails 2 are inserted between the driving tops, and the one ends 21a, 21 of each of the support rods 21, 21 are moved in opposite directions. The nail 2 is held between the holding bodies 22, 22.・
After this clamping process is completed, each of the support rods 21, 21
In between, a current 1 is supplied as shown by the arrow in FIG.
is heated to a predetermined temperature (approximately 200°C). Then, when this heating process is completed, the supply of the above-mentioned current is cut off,
Before the heating temperature of the nail 2 drops, one side surface 6A of the connecting material 6, 6, which has been previously formed into a belt shape by an extrusion molding machine (not shown), is attached to one side 4A of the body 4 of the nail 2. The connecting members 6, 6 are brought into pressure contact by pressing the supporting jig 23 in the direction of arrow A in FIG. 3 so that the width W between them is constant.

Then, the tissues of the connecting members 6, 6 are thermally fused to the tissues of the chest 4 of the nail 2, and these tissues are bonded together.

That is, the above-mentioned heating of the nails 2 and fixation to the connecting members 6, 6 are carried out by aligning the nails 2, 2, etc. with a constant interval in the longitudinal direction of the connecting members 6, 6. The above-mentioned connecting nail 1 can be manufactured by performing the process one by one while making the following adjustments.

In addition, each of the above-mentioned nails 2, 2... is arranged in parallel at a certain interval in advance, and an electric current is supplied to all of these nails 2, 2... all at once, and then heated. ,2
The above-mentioned connecting nail 1 can be manufactured even if the connecting members 6, 6 are pressed and fixed at one time.

Moreover, the connecting nail 10 shown in FIGS. 4 and 5 can also be manufactured by the above manufacturing method.

Note that the configuration of each nail 2, 2, . Place this connecting nail 1, then each of the above nails 2, 2...
Connecting material 1 for connecting ... in parallel at regular intervals
1 is formed in a wide band shape from a resin having thermal adhesive properties to metal, such as an acid copolymer resin, as in the first embodiment, and this connecting member 11 has each of the nails 2, The workability of connecting 2... is good. In the fastener heating step of the present invention, it is sufficient to connect the fastener even if the current is applied to the fastener at least near the joint with the continuous material in the main body of the fastener.

At this time, since parts of the main body of the fastener other than the vicinity of the joint with the connecting member are not directly heated, there is no particular effect on the material of the hit part of the fastener and the driving tip. Note that, at this time, it is desirable that the current supply be continued until the fixation with the connecting member is completed. Brief explanation of Kannami Fig. 1 is a partially omitted front view showing an example of a connecting nail manufactured by the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-sectional view showing an example of the connecting nail manufactured by the present invention. Schematic side view showing the embodiment, No. 4
The figure is a partially omitted front view showing another example of the connecting nail manufactured by the present invention, and FIG. 5 is a sectional view taken along the line B--B in FIG. 4.

1, 10...Connecting nail, 2...Nail, 4.
...Body part, 4A... One side part, 6,1 1...
... Connecting material, 6A, 11A... One side, 20.
...Heating device.

Figure 2 Figure 5 Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A step of forming a long connecting material for connecting a large number of metal fasteners using a resin that has thermal adhesive properties to metal, and a step of heating the fasteners by passing an electric current through each of the above-mentioned fasteners as a resistor. , a step of bringing one side of the main body portion of the heated fastener into relative pressure contact with one side of the connecting member, and a step of arranging each of the fasteners in parallel at regular intervals in the longitudinal direction of the connecting member. A method for manufacturing a connected fastener characterized by: