JPH07151120A - Spread leg nail and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] To make sure that the nail is opened by driving it into the ALC. [Structure] Long wire 1 by folding one wire into two
2 and the short leg 13 are formed, and the long leg 12 is made wider than the short leg 13, so that the resistance generation in the opening direction of the long leg 12 is increased, and the short leg is driven by driving the long leg 12. The long leg 12 and the short leg 13 are surely opened by bending to the 13 side.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In order 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 driving and obtains pull-out resistance. ing.

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

[0004] In the open nail 1, the head of the long leg 2 is hammered into the building material, and after the head of the short leg 3 comes into contact with the object to be fixed, the long leg 2 is struck more strongly. 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 of the leg opens in the building material, and the pull-out strength is to be exerted in this open leg.

[0005]

The conventional open-leg nail 1 as described above has a structure in which the long leg 2 and the short leg 3 are formed by folding a wire rod having a circular cross section into two.
Since the long legs 2 and the short legs 3 have a circular cross-sectional shape and have the same width, there is a problem that the legs of the long legs 2 and the short legs 3 are unlikely to open to obtain the pulling resistance.

That is, since both the long leg and the short leg have a circular cross section, the contact surfaces in the opening direction with the ALC when driven into the ALC are both arc-shaped surfaces having the same width. The resistance generation in ALC for the open leg direction becomes equal, and A for bending the short leg to the open leg direction is changed to the long leg.
The resistance between the long leg and the short leg does not occur between the long leg and the short leg, so that only the long leg bends in the middle.

SUMMARY OF THE INVENTION An object of the present invention is to provide an open leg nail in which long legs and short legs can be reliably opened and a sufficient pull-out strength can be obtained, and a method for manufacturing the same.

[0008]

In order to solve the above problems, the first aspect of the present invention is configured such that the long legs are wider than the short legs.

The long leg and the short leg are formed by folding a single wire into two folds, the short leg has a circular cross section, and the long leg has an irregular cross section in which the opposite surface of the short leg is a flat surface. The long legs can be wider than the short legs.

The short leg is formed by forming a part of the cross section having an irregular shape from the bottom of the locking head toward the bent point, and the part from the bending point to the locking head is longer than the long leg. The width can be narrowed.

According to the second aspect of the present invention, a wire rod having a circular cross-section is formed into a wide portion by pressing, and the wire rod is bent to form a long leg at the wide portion and a short leg at the portion where the wire rod is left as it is. Is.

[0012]

[Function] The head of the long leg is tapped into the building material and driven, and the head of the long leg further protruding in a state where the washer locked by the head of the short leg is in contact with the workpiece Drive in.

At this time, since the long legs are wider than the short legs, the resistance in the direction of opening the leg is greater when driving it into the building material, so that the short leg is surely moved toward the short leg side. Bend and open long and short legs.

[0014]

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.

In the first embodiment shown in FIGS. 1 (A) to 1 (F), the open-leg nail 11 uses a single metal wire rod, and the wire rod is bent in two to form a long leg 12 and a short leg. A leg 14 composed of 13 is formed, and the long leg 12 is attached to the tip of the short leg 13.
And the locking head 16 of the washer 15 inserted through the short leg 13 is provided so as to bend to the opposite side of the long leg 12, and the width W of the long leg 12 is made wider than the width W'of the short leg 13. Has become.

The wire rod made of the material used to form the leg portion 14 has a circular cross section, and the short leg 13 has a circular cross section as it is, whereas the long leg 12 has a bending point with the short leg 13. It is wider than the short leg 13 by forming the entire length up to the head with a deformed cross section such as a substantially semicircular shape in which the surface opposite to the short leg 13 is a flat surface 17.

The open-leg nail of the first embodiment is constructed as described above, and as shown in FIG. 1 (F), in order to fix the attached portion 32 to the building material 31 such as ALC, it is stacked on the building material 31. Insert the tip of the leg portion 14 into the hole 33 of the attached object 32, and
Hit the head of No. 2 with a hammer or the like and drive it into the building material 31.

The leg portion 14 goes straight into the building material 31, the washer 15 comes into contact with the object 32 to be attached, and when the entry of the short leg 13 is stopped, the protruding head end of the long leg 12 is driven. , The tip of the long leg 12 that is about to enter the building material 31 pushes the tip portion of the short leg 13 outward to bend and move, and at the same time, the tip portion of the long leg 12 also bends to the short leg 13 side. As shown in FIG. 1 (F), the long legs 12 and the short legs 13 have their ends opened in the building material 31 and the attachment head 32 is fixed by the locking head 16 via the washer 15. Thus, the above-mentioned open leg portion exhibits pullout resistance.

In the open leg nail 11, the long leg 12 is the short leg 1.
Since the width is wider than 3, it is possible to easily bend the short leg 13 toward the short leg 13 side with less resistance in the opening direction during the driving in the leg opening process. The spread legs are surely obtained.

Further, the short leg 13 has a circular cross section, whereas the long leg 12 has a flat surface 17 on the opposite side to the short leg 13, so that the building material is different in width and cross section shape. Within 31, the long leg 12 has a larger resistance generation in the open leg direction, so that the tip of the long leg 12 pushes the short leg 13 to the outside surely, so that the long leg 12 and the short leg 13 have a resistance. The tip can be surely opened with a light force.

Next, the spread leg nail of the second embodiment shown in FIG. 2 will be described. The same parts as those in the first embodiment described above are designated by the same reference numerals and will not be described.

The open-leg nail 11a according to the second embodiment.
Is a modified cross-section 21 similar to that of the long leg 12, with a part from the underside of the locking head 16 of the short leg 13 toward the bending point,
Only the tip side portion has a circular cross section 22 of the wire as it is, and the width W ′ of this circular cross section 22 is made narrower than the width W of the long leg 12.

The circular cross section 22 of the short leg 13 has the narrowest width, and during the leg opening process at the time of driving, the circular cross section 22 has less resistance to the leg opening direction and is more likely to bend. You will get a smooth spread of legs.

In order to manufacture the open-leg nail shown in each of the above-mentioned embodiments, one wire having a circular cross section having a predetermined length is used,
A part of this wire rod corresponding to the long leg is formed wide by pressing.

Next, the wire may be folded in two to form a long leg in the wide portion and a short leg in the portion where the wire is left as it is. The head may be formed with.

In the case of the open-leg nail shown in the second embodiment, a part of the portion corresponding to the short leg may be pressed.

The long leg 12 and the short leg 13 are not limited to the structure in which one wire is bent as shown in the figure, but two strip-shaped metal plates having different widths are used, and the tips of both are used. May be joined by welding to form the long leg 12 and the short leg 13, and the deformed cross section of the long leg 12 may have various sectional shapes other than the semicircular shape.

[0028]

As described above, according to the present invention, since the long leg is wider than the short leg, the resistance of the long leg in the opening direction is large and the long leg and the short leg are Since the open leg of the tip portion is smoothly generated with a light force, a sufficient pull-out strength can be obtained by the reliable open leg, and the long leg is not strongly hit to damage the attached object.

Furthermore, when a long wire and a short foot are formed by bending a single wire rod, it is easy to manufacture and advantageous in terms of cost.

[Brief description of drawings]

FIG. 1A is a perspective view showing an open-leg nail of a first embodiment,
(B) is the same front view, (C) is the same side view, (D) is the same enlarged plan view, (E) is a sectional view taken along the arrow ee of (B),
(F) is a vertical sectional view showing the driving state.

FIG. 2A is a perspective view showing an open leg nail of the second embodiment;
(B) is the same front view, (C) is the same side view, (D) is the same enlarged plan view, (E) is a sectional view taken along the arrow ee of (B),
(F) is a sectional view taken along the arrow f-f in (B), and (G) is a longitudinal sectional view showing a driving state.

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

[Explanation of symbols]

 11, 11a Open leg nail 12 Long leg 13 Short leg 14 Leg 15 Washer 16 Locking head

Claims (4)

[Claims] 1. An open-leg nail in which a long leg and a short leg form a leg portion, and a head is provided at the tip of the short leg, wherein the long leg is wider than the short leg. Open leg nail. 2. A long leg and a short leg are formed by folding a single wire into two folds, the short leg has a circular cross section, and the long leg has an irregular cross section in which the opposite surface of the short leg is a flat surface. The spread leg nail according to claim 1, wherein the long leg is formed so that the long leg is wider than the short leg. 3. A part of the short leg that extends from the bottom of the neck of the locking head toward the bending point is formed to have an irregular cross-sectional shape, and the portion from the bending point toward the locking head is wider than the long leg. 3. The spread leg nail according to claim 2, wherein the opening is narrow. 4. A method of manufacturing an open-leg nail in which a wire rod having a circular cross section is formed into a wide portion by a press and is bent to form a long leg at the wide portion and a short leg at the portion where the wire rod is left as it is.