JPS6329930Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a special nail called ALC that is applied to foamed concrete.

<Background of the invention> Conventionally, special nails used for foamed concrete have various structures using iron or aluminum materials. However, although the above-mentioned special iron nails can weld and fix various construction hardware to the nail head after being driven into foamed concrete, there is a risk that rust will occur and the expansion of the rust may destroy the foamed concrete.
It was forced to be banned. On the other hand, for example, special nails made of aluminum called Cut Nail (trade name) are less prone to rust than special nails made of iron, but on the other hand, architectural hardware that can be welded to the nail head is made of aluminum. The disadvantage is that it is limited to

Therefore, in order to prevent rust and to be able to weld iron hardware, it is conceivable to construct special nails from stainless steel, but in the case of stainless steel,
Since it is difficult to machine the side surface of the square shaft nail with a taper similar to that of the aluminum nail, the cost is high.

<Purpose of the invention> The present invention solves all of the above problems at once by attaching the nail head to a hollow nail shaft fitted with a pair of press-formed frame materials, making it cheaper and cheaper through mass production.
Another object of the present invention is to provide a new special nail with improved retention performance after driving.

<Description of Examples> The special nail of the present invention includes a pair of frame members 1a press-molded from stainless steel and having groove shapes that fit into each other.
A nail head 2, also made of stainless steel, is integrally attached to the upper end of the hollow nail shaft 1 formed by fitting the nail head 1b into the hollow nail shaft 1.

The frame members 1a, 1b are formed by pressing side walls 12, 13, 15, 16 facing both sides of the strip-shaped substrates 11, 14, and each side wall has a
The tip part is sloped low, and the inner frame material 1b
By slanting the tip of the substrate to match the inclination of the side walls 15, 16, the upper sides of the side walls 15, 16 are made straight sides, and the above-mentioned frame members 1a, 1b are fitted facing each other to form a tapered tip. A hollow nail shaft is formed with a taper 18, the tips of both substrates 11 and 14 are integrated by spot welding 17, and a stopper with a nail head 2 is formed on the proximal cylindrical portions of both frame members 1a and 1b. A shaft 21 is fitted into the shaft 21, and spot welding 22 is applied to the fitting portion to integrate the parts.

Both side walls 15 and 16 of the inner frame member 1b form a concave portion whose upper side is curved over substantially the entire length, and a deflection gap 3 is formed between the upper side and the substrate 11 of the outer frame member 1a.

In the embodiment shown in FIG. 3, a curved concave portion is formed in one side wall 15 to provide a deflection gap 3 on one side. In this case, when driving into foamed concrete, the nail shaft 1 is It penetrates into the concrete while twisting due to the deflection gap 3.

However, as shown in FIG. 4, when the special nail of the present invention is driven into foamed concrete, it plunges straight into the concrete 4 at the beginning of driving. As the hollow nail shaft 1 enters the concrete, the nail shaft is driven into the concrete 4 in a wedge shape while being curved by its taper 18 and the compressive reaction force of the foamed concrete 4, and the inner frame material 1b bends against the elasticity. It flexibly engages into the outer frame member 1a at the gaps 3, 3, and the outer surface of the frame member 1b comes into surface contact with the corresponding concrete 4 due to the reaction force of the flexure, improving the slip-out prevention effect.
In the case of one side deflection gap 3 in Fig. 3, the inner frame member 1b
By engaging with the outer frame member 1a in a twisted manner,
Twisting occurs in the nail shaft 1, further improving the pull-out prevention force.

<Configuration and Effects of the Invention> As described above, in the present invention, the pair of frame members 1a and 1b are fitted oppositely, their tips are joined, and the nail head 2 is attached to the base end to integrate them. 1b and the nail head 2 can be mass-produced and supplied at low cost by press working stainless steel material or the like. In addition, the problem of rusting has been solved, and by making the inner frame material deflect evenly on both sides or off-center, it can be bent into a wedge shape or cast in a twisted shape while being bent, simplifying the structure and achieving the purpose of the invention. have the effect achieved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a special nail for foamed concrete according to the present invention, Fig. 2 is a cross-sectional view along line A-A,
FIG. 3 is a sectional view showing another embodiment, and FIG. 4 is a sectional view showing the pouring situation. 1...Hollow nail shaft, 1a, 1b...Frame material, 2...
Nail head.

Claims (1)

[Scope of utility model registration request] A nail head is attached to the base end of a hollow nail shaft fitted with groove-shaped frame materials that fit into each other, and the tip of the hollow nail shaft is joined and fixed to the bottom of the groove, and a groove is attached to the inner frame material. A special nail for foam concrete that has a curved recess formed along its entire length on the top side of the wall.