JPS6142964Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a twisted nail used for fixing wood to a soft material such as foamed concrete.

In recent years, foamed concrete has come into widespread use as a wall component of buildings, and when securing wood to such foamed concrete walls, it is necessary to use twisted nails.

This is because foamed concrete is porous, brittle, and soft, and has no resilience, so it can be easily pulled out with a straight nail.

As a conventional twisted nail, a twisted nail 2 is known in which a main body 1 is formed by spirally twisting a thin metal plate, as shown in FIG.

By the way, when twisting the main body 1 of such a twisted nail 2, it is difficult to twist it uniformly over the entire length due to variations in the hardness of the material. In other words, if there is a part of the metal plate that changes in hardness, the hard part will have a strong repulsive force during manufacturing deformation, and will be less likely to deform than the soft part, regardless of the manufacturing method, such as twisting or press heading. Therefore, variations occur in the helix angle.

If there are variations in the torsion angle of the main body 1, the approach rotation during driving will change at the uneven parts, and the inner wall will be pushed out and destroyed at the uneven parts, resulting in a lack of pull-out strength, and the material of the nail material. homogenization,
Research on manufacturing methods to make the twist angle uniform is desired.

However, with soft materials such as foamed concrete, when a blow is applied when driving a twisted nail, the lower surface of the main body in the direction of entry always compresses the inside of the wall.
A gap is created between the upper surface side in the direction of the head and the inside of the wall, and even if the torsion angle is uniform over the entire length, it will not be possible to prevent initial wobbling if a pulling force is applied in the direction of the head. It turns out.

In order to prevent the initial wobbling as described above and to prevent the foam concrete wall from breaking when an axial driving force is applied to the main body 1, as shown in Fig. 2, when the main body 1 is placed, It has been proposed to provide a rounded portion 3 at the corner that strongly contacts the concrete wall, or to form both sides of the main body 1 into arcuate surfaces 4 extending in opposite directions around the axis, as shown in FIG. However, such processing will not produce a sufficient effect unless the torsion angle of the main body 1 is uniform over the entire length.

In addition to the twisted nails mentioned above, there are other uses and purposes,
Although the effects are different, there are wood screws with a circular cross-section body and sharp protrusions that look like twists, and screw nails whose body is formed by twisting square wire into a square cross-section. The inside of the foamed concrete is destroyed by the shafts and sharp protrusions, causing rattling, so it is only effective for materials such as wood that have resilience.

This invention was made to solve the problems and drawbacks mentioned above, and its object is to provide a twisted nail which has a strong pull-out strength even against the initial pull-out force after driving into soft parts such as foamed concrete, does not wobble, and can be efficiently manufactured by the current twisting method, which makes it difficult to make the twist angle uniform.

The structure of this device is that the main body, which is approximately rectangular in cross section, is twisted over 180° between both ends, and the twist angle gradually changes to become larger on the head side than on the tip side, so that the main body has a substantially rectangular cross section. Only the upper side in the head direction is in close contact with the wall member to exhibit strong pull-out strength.

This invention will be explained below based on the embodiments shown in FIGS. 4 to 9 of the accompanying drawings.

As shown in the figure, the twisted nail 11 of this invention is constructed by providing a head 13 at one end of a main body 12 using a rectangular metal plate having a substantially rectangular cross-sectional shape, and a tapered tip 14 at the other end. The main body 12 is given a twisting deformation in which the twist amount θ ₁ between both ends exceeds 180° with respect to the central axis in the longitudinal direction, and the twist angle is gradually deformed so that it becomes maximum on the head 13 side and becomes minimum on the tip 14 side. It's changing.

The cross-sectional shape of the main body 12 is not limited to the regular rectangle shown in FIG. 8, but may also have a desired cross-sectional shape, such as a diamond shape with a thick center or rounded corners. The thickness of the main body 12 is to provide strength to prevent bending during driving.
It is preferable to have a wall thickness of 1.5 mm or more in order to press the inner wall surface of the member with strong force.

In the main body 12, the torsion angle with respect to the longitudinal direction is preferably such that the maximum angle θ ₂ near the head 13 is 40° or less, and the torsion angle θ ₃ on the distal end side is preferably 40° or less.
is naturally smaller than θ ₂ and is preferably within 18°.

If the angle θ ₁ of the main body 12 on the head 13 side exceeds 40°, when driving from wood A to soft material B, as shown in Fig. 7, unreasonable resistance will occur on the head side, and the wood will If A is destroyed and a hole is made large enough for the main body 12 to rotate, the main body 12 will be able to rotate freely, and if it is slightly reversed, the compressed soft material B and the compressed surface of the main body 12 will separate, and the main body 12 will not rotate. You will be able to get out of it. Note that if the helix angle on the tip side exceeds 18 degrees, the amount of rotation of the main body during driving will be excessive, the pressure contact force between the side surface of the main body and the inner wall of the member will be weak, and a sufficient effect will not be obtained.

Furthermore, it is effective to provide the taper of the tip 14 of the main body 12 on two wide surfaces or one surface as shown in the figure to prevent the wood from cracking. The taper angle θ ₄ can be freely selected depending on the properties of the member to be driven, and in order to obtain even higher pullout strength, the wide portions on both sides of the main body 12 are tapered from the tip toward the head. It may be formed into a tapered surface.

In this way, the length, width and thickness of the main body 12,
The amount of torsional deformation, the torsional angle, and the position and angular shape of the tapered tip can be freely selected, and the shape of the head 13 is square as shown in FIGS. Alternatively, as shown in FIG. 9, the upper end of the main body 12 may be split into two and both sides thereof may be bent in opposite directions.

In addition, the amount of twist of the main body 12 can be freely selected depending on the application as long as it is not less than 180 degrees.
The twisted shape can be formed using a twisting method.

If the twist amount of the main body is 180° or less, press forming using a mold is possible, and it is relatively easy to twist the entire body to make it uniform.
If the angle exceeds 180°, manufacturing using a mold becomes difficult.

This invention uses twisting processing to provide a twisted nail that does not cause initial rattling on soft materials, since the amount of twist exceeds 180° and press processing with a mold is impossible. Since the twist angle of the main body is gradually changed so that it becomes larger on the head side than on the tip side, it can be manufactured without any problems even if the material has parts with uneven hardness.

The torsion nail of this invention has the above-mentioned structure, and is used to attach a long and narrow piece of wood A to a soft material B made of foamed concrete, for example.

When the twisted nail 11 is driven into the wood A with a hammer, the twisted nail 11 enters the wood A as shown in FIG. 7 while maintaining an approach angle θ ₄ approximately equal to the amount of torsional deformation of the main body 12.

As the twisted nail 11 advances, the angle of the main body 12 changes from θ ₃ to θ ₂ , and the entrance angle also changes.

As the approach angle increases, the torsion nail 11 itself is forcibly twisted in the torsion direction, and the main body 12 is twisted in the direction of arrows a and b shown in FIG.
The end faces 12a, 12b in the twisting direction are forcibly pressed, and the portion of the soft material B shown by the lattice lines is compressed and solidified, and comes into strong contact with the end faces 12a, 12b in the twisting direction.

Although the pressure is small compared to the end faces 12a and 12b in the twisting direction, the arrows c and d in FIG.
The end faces of the thick portions on both sides also press against the soft material B and come into close contact with the soft material B.

As described above, the torsion nail 11 compresses the soft material B at each part of the four circumferential surfaces of the main body 12 by slightly increasing the twist of the main body 12, thereby strengthening the adhesion, thereby preventing wobbling in the axial direction. is prevented.

By the way, if the torsion angle is uniform over the entire length, the impact during driving tends to create a slight gap between the anchor body and the soft material. When a pulling force is applied to the rear twist nail body, it moves in the axial direction of the body, so
It appears as a large rattle.

On the other hand, in the twisted nail 11 of this invention, as mentioned above, the main body 12 is located at the arrows a and b in FIG.
Since the soft material A is strongly pressed in the directions c and d to achieve close contact, there is no gap that would cause wobbling in the drawing direction.

Furthermore, in the twisted nail 11 of this invention, a gap is created on the back side opposite to each soft material compression surface, such as the end faces 12a and 12b in the twisting direction of the main body 12, and the above-mentioned screw with a changed lead angle is used. Although the structure does not take into account loosening in the rotational direction, in actual use of the twisted nail 11, the long and thin wood A is attached at multiple locations, so carelessness during installation may occur. Otherwise, since the wood A does not rotate once it is installed, there is no need for a structure to prevent loosening due to rotation.

As described above, the purpose of the twisted nail 11 of this invention is not to prevent loosening due to rotation, but to strengthen the close contact with a part of the soft material B compressed by a part of the main body 12 by increasing the twist of the main body 12. The purpose of this is to prevent initial wobbling in the axial direction.

As described above, according to this invention, the main body, which has a substantially rectangular cross section, is twisted and deformed by 180 degrees or more between both ends with respect to the longitudinal center line, and the twist angle gradually changes between both ends. Therefore, the increase in torsion of the main body compresses a part of the cast member, and this compression strengthens the adhesion with the member. This means that driving can be performed without causing backlash in the axial direction.

In addition, twist forming of the main body is made possible by processing using the twist manufacturing method, and the twist angle is gradually changed, so the accuracy of the twist deformation process is not so important and there is no need to worry about variations in the hardness of the material. It can be manufactured without any problems, and the manufacturing cost can be reduced by realizing mass production.

In addition, the main body has a nearly rectangular cross section, and the
Since it is twisted at an angle of 180° or more, it can be driven directly into wood or driving parts without drilling pilot holes, which has the effect of greatly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional twisted nail, Figs. 2 and 3 are sectional views of different examples showing the cross-sectional shape of the main body in the above, and Fig. 4 is a front view of a twisted nail according to this invention. Fig. 5 is a side view of the same, Fig. 6 is a bottom view of the same, Fig. 7 is a vertical sectional view showing the advancing state of the tip at the time of driving, Fig. 8 is a cross-sectional plan view during driving, and Fig. 9 is a side view of the same. The figure is a front view showing another example of the head of a twisted nail. 11 is a twisted nail, 12 is a main body, 13 is a head, 1
4 is the tip.

Claims (1)

[Claims for Utility Model Registration] (1) A main body having a substantially rectangular cross section between both ends.
A twisted nail that is formed with a twist of more than 180°, and the twist angle of the main body gradually changes so that it becomes larger on the head side than on the tip side. (2) The twisted nail according to claim 1 of the utility model registration claim, the body of which is made of a metal with a thickness of 1.5 mm or more. (3) The torsion angle of the main body is 18° or less at the tip with respect to the central axis in the longitudinal direction of the main body,
The twisted nail according to claim 1 of the utility model registration claim, wherein the head offset is 40° or less.