JPH0137605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to nails for use in foam building materials such as ALC.

[Conventional technology and problems]

Conventional nails used to attach objects to walls made of foamed building materials such as ALC boards have a structure in which the body has a head at one end and an inclined cut surface from the middle to the tip. By gradually compressing the foamed building material on the cut surface during driving, the contact pressure between the body and the foamed building material is increased to obtain pull-out strength.

By the way, nails like the one above have the problem of being easily loosened by vibrations and easily coming off because the cut surface of the body obtains pull-out strength only at the part that compresses the ALC in the driving direction. be.

[Purpose of the invention]

This invention was made to solve the above-mentioned problems, and an object thereof is to provide a nail for foamed building materials that has excellent pull-out strength and does not loosen even when subjected to vibrations.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention has a groove that gradually becomes narrower from the tip toward the head in the axial direction of the body on the outer peripheral surface of the body that has a head at one end. It has a structure in which it is provided in an inclined manner.

[Effect]

When the body is driven into the foam building material, the foam material fits into the groove as the body advances, and the groove becomes narrower toward the head, so the foam material that fits into the groove is compressed. It turns out.

At the same time, since the groove is inclined in a gentle spiral with respect to the axial direction of the body, the body is guided by the inclination angle of the groove and enters while rotating, and the foam building material is compressed and rotated by the groove. This creates a pull-out and rotation prevention effect, improves vibration resistance, and eliminates loosening.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the nail is formed by connecting a head 2 to one end of a body 1 and providing a groove 3 on the outer peripheral surface of the body 1.

The body portion 1 is formed into a tapered cylindrical shape whose diameter gradually increases from the tip toward the head 2, and the tip thereof becomes a sharp end 1a.

The groove 3 provided in the body 1 extends from the tip of the body 1 to a position close to the head 2, and has a cross-sectional shape similar to that of the second
As shown in FIGS. 5 to 5, the tip is widest and gradually becomes narrower toward the head 2.

Further, as shown in FIG. 1, the groove 3 is formed in a gentle spiral slope with respect to the axial direction of the body portion 1.

In the illustrated case, the groove 3 has an arcuate cross section and the body 1
Although two stripes are provided on both sides of the axis, the cross-sectional shape and number are not limited thereto.

The nail of this invention has the above structure,
It is used for attaching roofing materials to foam building materials A such as ALC.

When driving into the foam building material A, when the body part 1 enters the foam building material A, since the head 2 side has a large diameter, the foam building material A is compressed on the circumferential surface, and the foam building material A is compressed between the circumferential surface and the foam building material A. Demonstrates pull-out strength due to the pressure welding force.

When the body part 1 enters, the foamed building material A fitted into the groove 3 provided on the circumferential surface is compressed by the groove 3, which gradually becomes narrower, as shown in Fig. 5. , the compressed portion _A1 of the foamed building material A is firmly pressed against the groove 3, improving the pull-out strength.

At the same time, since the groove 3 is spirally inclined with respect to the axial direction of the body part 1, the body part 1 is guided by the groove 3 and enters the foam building material A while rotating. Provides anti-rotation effect.

〔effect〕

As described above, according to the present invention, the pull-out force due to pressure contact between the outer circumferential surface of the body and the foam building material is added to the pull-out force due to pressure contact between the groove and the compressed portion, and in addition, the anti-rotation effect due to rotational entry of the body is added. Because it is added,
Due to the synergistic effect of the above three factors, it is possible to obtain fixation with excellent vibration resistance and no loosening, and also to obtain firm fixation due to improved pull-out strength.

[Brief explanation of drawings]

Fig. 1 is a front view of the nail according to the present invention, Fig. 2 is a sectional view taken along the arrow - in Fig. 1, and Fig. 3 is a
FIG. 4 is a cross-sectional view taken along the arrow - in FIG. 1, and FIG. 5 is a cross-sectional view showing the state at the time of driving. 1...Body part, 2...Head part, 3...Groove, A...Foamed building material, _A1 ...Compression part.

Claims (1)

[Claims] 1. A foamed material having grooves that gradually become narrower from the tip toward the head on the outer circumferential surface of the body with a head at one end, inclined with respect to the axial direction of the body. Nails for building materials. 2. The nail for foam building materials according to claim 1, wherein the body portion is cylindrical and gradually becomes thicker from the tip to the head.