JP2880054B2 - Manufacturing method of open leg nail - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an open leg nail used for attaching wood or equipment to building materials such as ALC (cellular concrete) and gypsum board.

[0002]

2. Description of the Related Art In order to attach wood or equipment to building materials having brittle materials such as ALC and gypsum board, legs are opened in the building material by driving, and open-split nails are used to obtain pull-out resistance with the opening. ing.

[0003] As a conventional open leg nail 1, as shown in FIG. 3, for example, as proposed by US Patent No. 2,501,701, a metal wire having a circular cross section is bent into two folds to form a long leg. 2 and the short leg 3, and the heads 4 and 5 are provided at short portions of the long leg 2 and the short leg 3, respectively.

[0004] The open leg nail 1 strikes the head of the long leg 2 with a hammer and drives it into the building material, and after the head of the short leg 3 abuts against the object to be fixed, strikes the long leg 2 more strongly. As a result, the distal end of the long leg 2 pushes and bends the distal end of the short leg 3, and at the same time, the distal end of the long leg 2 also bends toward the short leg 3 from the middle, so that the long leg 2 and the short leg 3 are bent. The distal end is opened in the building material, and the open leg portion exerts pull-out resistance.

Therefore, the open leg nail 1 requires the head 5 at least at the rear end of the short leg 3 in order to cause the long leg 2 to open and to fix an object to be fixed.

Conventionally, in order to form the heads 4 and 5 at the ends of the long leg 2 and the short leg 3, respectively, the rear extensions of the long leg 2 and the short leg 3 are bent in opposite directions, respectively. This is done by crushing the bent portion to make it flat.

[0007]

However, the method of forming the head by crushing the bent portion requires a pressing step, and when the head is enlarged in a plane, the thickness becomes thinner and the strength is reduced. If the thickness is increased and the strength is increased by increasing the wall thickness, there is a problem that the pressing area against the object is reduced, and the fastening strength of the object becomes unstable.

Accordingly, an object of the present invention is to form a head having a sufficient strength and a planar size by forming a head part by a separate plate, and to securely fasten a fixed member. It is an object to provide a method for manufacturing a nail.

[0009]

Means for Solving the Problems To solve the above problems, the invention of claim 1 folds a continuous wire rod into two.
Is formed of an elongated legs and short legs come together tip by bending
A leg is formed, and the weight of the long leg and the short leg is
Inter becomes mutually plane incorporating the open leg promotion of Nagashakuashi to, insert the head plate having a through portion above Symbol length Shakuashi the short side after Nagashakuashi, after the head plate and the short legs A configuration in which short portions are overlapped and welded is adopted.

[0010]

[Function] The long leg and the short leg with the tip integrated are overlapped, the penetrating part of the head plate is inserted into the rear end of the long leg, and this head plate is overlapped with the rear end of the short leg. ,
If the overlapping portion between the rear end of the short leg and the head plate is fixed by welding, the long leg can move in the axial direction with respect to the short leg and the fixed head plate, and the long leg can be moved when driving into the building material. Along with ensuring that the leg is open,
A head plate having a sufficient size and strength can be adopted as the head plate, so that the fastening of the fixed object can be reliably obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1A, an open leg nail 11 is made of a wire having a semicircular cross section, and is folded in two so that the flat surfaces are opposed to each other, and the long legs 12 and the short legs are integrated. A leg portion 14 composed of a leg 13 is formed, and a head plate 15 is inserted into a rear end of the long leg 12 projecting from the short leg 13, and the head plate 15 is superimposed on a rear end of the short leg 13. The head plate 15 is fixed to the short leg 13 by welding 16 of the overlapped portion.

The head plate 15 has a penetrating portion of the long leg 12, in the illustrated case, a fitting hole 17;
If the head plate 15 is fixed to the short leg 13 with the 7 inserted into the long leg 12, the long leg 12 is allowed to move in the axial direction with respect to the head plate 15. .

Incidentally, the head plate 15 is
Although a disk-shaped member is shown, the hole may be formed in an elliptical shape, a polygonal shape, or the like, and a penetrating portion provided in this may be cut out other than the fitting hole 17 or a combination of both.

The illustrated open leg nail 11 is provided with recesses 18 and 19 on the overlapping surface of the long leg 12 and the short leg 13 on the distal end side of the leg portion 14 so as to face the wedges over both the recesses 18 and 19. A leg-shaped opening promotion body 20 is incorporated.

The concave portion 18 provided in the long leg 12 is formed in a shape in which an inclined surface 21 which is inclined upward to the flat surface side is provided at the upper end of the rising wall along the axial direction.
The leg 14 has a shape that fits over both recesses 18 and 19.
Is formed to a width that fits within the maximum diameter of
8 fits into the inclined surface 2 corresponding to the inclined surface 21.
It is 2.

FIGS. 1B and 1C show an example of a method of assembling the leg opening accelerating body 19 into the recesses 18 and 19, and bending the long leg 12 and the short leg 13 in a wire as shown in the figure. The portion is made thin by shaving the flat surface side, etc., and at least the end of the shaved portion on the long leg 12 side is set as the inclined surface 21, and the wire is folded in two at the thin thick portion to form the long leg 12 and the short length. The leg 13 is formed, and a space 23 is provided inside the thin and thick portion by this bending, and a wedge-shaped leg-opening promoting body 20 is incorporated into the space 23.
As shown in (C), by drawing the tip from both sides and compressing the tip, the recesses 18 and 19 can be formed and the leg-opening promoting body 20 can be assembled.

The leg-opening promoting body 20 is shown as an example in which a separate body from the leg portion 14 is simply fitted over both the recesses 18 and 19, but this leg-opening promoting body 20 is fixed to the short leg 13. Or the concave portion 18 of the long leg 12 on the flat surface side of the short leg 13.
A protrusion that fits inside may be provided integrally to provide a leg-opening promoting body.

Further, in the case shown in the drawing, the open leg nail 11 is shown by folding a wire having a semicircular cross section in two so that the flat surfaces overlap, but the same wire is folded in two so that the arcuate surfaces are back to back. or, but it may also be formed legs with wire of circular section.

Next, the fastening of the fixed member to the building material of the open leg nail of the present invention illustrated in FIG. 1A will be described with reference to FIG.

First, as shown in FIG. 2 (A), when the end of the long leg 12 of the open leg nail 11 in which the front end bent into two is applied to the building material a or the like is hit, the building material a The head plate 15 fixed to the end of the short leg 13 comes into contact with the surface of the fixed member b.

Furthermore, if the end of the long leg 12 of the open leg nail 11 is hit, the short leg 13 cannot enter, so only the long leg 12 attempts to enter. The recessed portions 18 and 19 of the long leg 12 and the short leg 13 are loaded with the leg opening promoting body 20,
As shown in FIG. 2 (B), the inclined surface 21 formed in the concave portion 18 of the long leg 12 which is going to advance in the axial direction strikes the inclined surface 22 of the leg opening promoting body 20 and slides outward so as to slide outward. Start. The striking force in the axial direction that is subsequently applied to the long leg 12 once the leg has begun to open easily acts as a force in the leg opening direction as shown in FIG. The long leg 12 starts the leg-spreading operation without requiring a large force, and continues to open the leg while bending the short leg 13 while bending itself, as shown in FIG.
When the end of the long leg 12 is driven into the same position as the head plate 15 fixed to the end of the short leg 13, the optimum leg opening state is obtained.

The leg 14 is forcibly opened with the inclined surface 22 of the leg opening promoting body 20 and the inclined surface 21 of the concave portion 18 after the short leg 13 stops entering. So
The timing of opening the legs is not delayed, and the long legs 12
Can be opened with a light driving force.

[0024]

As described above, according to the present invention, the configuration as described above has the following effects.

(1) Since the head plate inserted at the rear end of the long leg is welded to the end of the short leg, the planar size and thickness can be set to required values in forming the head of the open nail. As a result, reliable opening of the long leg and firm fastening of the fixed member can be obtained.

(2) Since the head plate is simply welded to the short portion, the formation of the head can be performed more easily and inexpensively than in press molding.

(3) Bending a continuous wire into two
To form a leg consisting of a long leg and a short leg with integrated tips
The surface where the long leg and the short leg overlap on the tip side of this leg
Since a long leg-opening promoting body was incorporated in between,
The long leg can be forcibly opened and the tie
The legs are opened with a light driving force without delaying the mining
Can be

[Brief description of the drawings]

1A is a perspective view showing an example of a leg-spread nail according to the present invention, FIG. 1B is a perspective view of a main part before a leg-spreading body is incorporated in a leg, and FIG. 1C is a leg-spreading body. Main part front view with embedded

FIGS. 2A, 2B, 2C, and 2D are longitudinal cross-sectional views sequentially showing a step of leg opening by driving a nail;

FIG. 3 is a front view showing a conventional split nail;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Opening nail 12 Long leg 13 Short leg 14 Leg 15 Head plate

Claims (1)

(57) [Claims] 1. A continuous wire rod is folded in two to form a leg portion including a long leg and a short leg having an integrated end .
On the tip side of this leg, between the overlapping surfaces of the long leg and the short leg
Incorporate open leg promotion of Nagashakuashi, insert the head plate having a through portion above Symbol length Shakuashi the short side after Nagashakuashi, overlapping the short portion after the head plate and the short legs A method for manufacturing an open leg nail, comprising welding together.