JPH07103217A - Manufacture of split nail - Google Patents

Abstract

PURPOSE:To provide a manufacturing method simplifying the formation of the head of a nail driven into building material such as ALC and split. CONSTITUTION:A long-sized leg 12 and a short-sized leg 13 with the respective tips integrated are overlapped with each other. A head plate 15 with the rear end side of the long-sized leg 12 inserted into a fit-in hole 17 is put over the rear end of the short-sized leg 13, and the head plate 15 is fixed to the short- sized leg 13 by welding (16) to enable the formation of a head.

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 To attach wood or equipment to a building material such as ALC or gypsum board that is fragile, an open leg nail is used that opens the leg in the building material by hammering and that can withstand pull-out strength. ing.

As a conventional open leg nail 1, as shown in FIG. 3, for example, as proposed in US Pat. No. 2,501,701, a metal wire rod having a circular cross section is folded in two and the leg portion is made into a long leg. 2 and short legs 3, and heads 4 and 5 are provided at the short portions of the long legs 2 and the short legs 3, respectively.

The open leg nail 1 hits 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 contacts the object to be fixed, the long leg 2 is further strongly hit. As a result, the tip of the long leg 2 pushes the tip of the short leg 3 and bends, and at the same time, the tip of the long leg 2 also bends from the middle toward the short leg 3 side. The tip opens the leg inside the building material, and the pull-out strength is exerted at this leg.

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 end extensions of the long leg 2 and the short leg 3 are bent in opposite directions, This is done by crushing this bent portion to make it flat.

[0007]

However, the method of crushing the bent portion to form the head requires a pressing step, and if the head is made large in plan, the wall thickness becomes thin and strength is increased. If the thickness is weakened and the wall thickness is increased to give strength, the pressing area against the fixed object is reduced, and the fastening strength of the fixed object becomes unstable.

Therefore, an object of the present invention is to provide an open leg which has a sufficient strength and a planar size and can securely fasten a fixed member by forming the head with a separate plate. An object is to provide a method for manufacturing nails.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a head plate having a long leg and a short leg which are integrated at the distal end and which has a penetrating portion of the long leg. It is configured to be inserted into the rear end side of the long leg, and the head plate and the rear end of the short leg are overlapped and welded.

[0010]

[Operation] The long leg and the short leg with integrated tips are overlapped, the penetrating part of the head plate is inserted into the rear end side of the long leg, and this head plate is overlapped with the rear end of the short leg. ,
If the rear end of the short leg and the overlapping part of the head plate are fixed by welding, the long leg can be moved in the axial direction relative to the short leg and the fixed head plate, and the long leg can be moved long when driving into building materials. It is possible to reliably open the shakudoku,
As the head plate, one having a sufficient size and strength can be adopted, whereby the fastening of the fixed object can be surely obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

As shown in FIG. 1 (A), the open-leg nail 11 is made of a wire material having a semicircular cross section, which is folded in two so that its flat surfaces face each other, and a long leg 12 and a short leg 12 whose ends are integrated. A leg portion 14 composed of legs 13 is formed, and a head plate 15 is inserted into the rear end of the long leg 12 protruding from the short leg 13, and the head plate 15 is superposed on the rear end of the short leg 13. The head plate 15 is fixed to the short leg 13 by welding 16 the overlapped portions.

The head plate 15 has a penetrating portion of the long leg 12, a fitting hole 17 in the case shown in the drawing.
If the head plate 15 is fixed to the short leg 13 in a state where 7 is 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. .

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

In the illustrated open leg nail 11, recesses 18 and 19 are provided so as to face each other on the overlapping surface of the long leg 12 and the short leg 13 on the tip side of the leg portion 14, and the wedges are extended over both the recesses 18 and 19. The leg-shaped spreader promotion body 20 is incorporated.

The recess 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 portion 14 has a shape that fits over both recesses 18 and 19.
Is formed to have a width that fits within the maximum diameter of
The part that fits inside 8 is the inclined surface 2 that matches the inclined surface 21.
It is 2.

FIGS. 1 (B) and 1 (C) show an example of a method of assembling the leg opening promoting member 19 into the recesses 18, 19, and as shown in the drawing, the long leg 12 and the short leg 13 are bent in a wire rod. The part is made thin by shaving the flat surface side, and at least the end of the shaving part on the long leg 12 side is set as the inclined surface 21, and the wire rod is folded in two at the thin thickness part and the long leg 12 and the short length. The leg 13 is formed, and by this bending, a space 23 is provided inside the thin-walled thick portion, and the wedge-shaped open leg promoting body 20 is incorporated into the space 23.
As shown in (C), the distal end portion is subjected to drawing processing from both sides, so that the concave portion 18, 19 can be formed and the spread leg promoting body 20 can be assembled by crimping the distal end portion.

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

Further, in the case of the open leg nail 11 shown in the drawing, a wire rod having a semicircular cross section is folded in two so that the flat surfaces are overlapped with each other, and the open leg promoting member 20 is incorporated at the tip end. The wire may be folded in two so that the arcuate surfaces are back to back, or the leg may be formed using a wire having a circular cross section. Furthermore, the use of the leg opening accelerator 20 is omitted, and a long leg and a short leg are simply used. The leg 14 is formed by folding a single wire into two, and a notch is provided at a position near the tip of the long leg and the short leg in the leg to smoothly open the leg. The structure may be such that

Next, the fastening of the fixed member to the building material of the spread 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 spread leg nail 11 in which the two bent ends are applied to the building material a or the like, the end of the long material 12 is hit from the tip. 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, when the end of the long leg 12 of the spread nail 11 is hit, the short leg 13 cannot enter, so that only the long leg 12 attempts to enter. Since the leg opening accelerator 20 is loaded in the recesses 18 and 19 of the long leg 12 and the short leg 13,
As shown in FIG. 2B, the inclined surface 21 formed in the concave portion 18 of the long leg 12 that is going to move in the axial direction strikes the inclined surface 22 of the spread leg promoting body 20 and slides outward so as to slide outward. To start. The striking force in the axial direction continuously applied to the long leg 12 that has once started to open acts as a force in the open leg direction, as shown in FIG. 2C. The long leg 12 starts the leg opening operation without requiring a large force, and continues to open the leg while curving the short leg 13 while curving itself, as shown in FIG. 2 (D).
When the end of the long leg 12 is driven up to almost the same position as the head plate 15 fixed to the end of the short leg 13, the optimum open state is obtained.

When the legs 14 are opened, the long legs 12 are forcibly opened by the inclined surface 22 of the leg opening accelerator 20 and the inclined surface 21 of the recess 18 after the short legs 13 have stopped entering. So
The long leg 12
It can be opened with a light striking force.

[0024]

As described above, according to the present invention, since it has the above-mentioned structure, the following effects can be obtained.

(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 the required values when forming the head of the open leg nail. As a result, reliable opening of the long legs and firm fastening of the fixed member can be obtained.

(2) Since the head plate is simply welded to the short portion, the head can be formed more easily and cheaply than the press forming.

(3) Since the head can be formed separately from the legs,
The shape and material can be arbitrarily selected.

[Brief description of drawings]

FIG. 1A is a perspective view showing an example of an open leg nail according to the present invention, FIG. 1B is a perspective view of a main part before the leg opener is incorporated into a leg, and FIG. Front view of the main part incorporating

2 (A), (B), (C), and (D) are vertical cross-sectional views sequentially showing a process of opening legs by driving nails with open legs.

FIG. 3 is a front view showing a conventional nail spreader.

[Explanation of symbols]

 11 Open leg nail 12 Long leg 13 Short leg 14 Leg body 15 Head plate

Claims (1)

[Claims] 1. A long leg and a short leg having integrated ends are overlapped with each other, and a head plate having a penetrating portion of the long leg is inserted into the rear end side of the long leg. A method for manufacturing an open-leg nail, which comprises superimposing and welding the rear end portion.