JPS587128Y2 - nail - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a nail with enhanced retaining action.

Conventional nails of this type include those with a spiral groove or annular groove on the base end of the nail shaft, or those with a flange-like protrusion, but the material into which all nails are driven is foamed concrete. In the case of a soft porous body such as, the friction between the material and the material is small, so the pull-out prevention force is weak, and a sufficient pull-out prevention effect cannot be obtained.

In order to solve the above-mentioned drawbacks, the present invention has an outer cylinder made up of a plurality of trough-like cylinders that are in contact with the outer circumferential surface of the center shaft, and each cylinder is expanded outward in the material when the nail is pulled out. The purpose of the present invention is to provide a nail that significantly increases the stopping power and has a sufficient nail removal prevention effect.

The present invention will be specifically described below based on embodiments shown in the drawings.

As shown in FIG. 1, the nail of the present invention has a central shaft 1 having a head 11 having a slightly larger diameter than the shaft diameter at one end and a tapered point 12 at the tip.
and an outer cylinder 2 tightly fitted to the outer peripheral surface of the shaft portion 10 of the center shaft 1, and a washer 4 is tightly and slidably fitted to the outer peripheral surface of the outer cylinder 2.

There are a plurality of outer cylinders 2, in the drawing, a pair of trough-shaped cylinder members 3°300, with both end surfaces facing each other, the head side ends welded and connected, and the joint part 21 side bent outward. Flange 22
was formed.

Each cylindrical member 3, 30 has its entire length matched with the axial length of the central shaft 1, and an opening 5 is formed between the tip and the pointed end 12 of the central shaft 1.

Further, each of the cylindrical members 3 and 30 has a symmetrical tapered surface 23 at the contacting surface of the distal end thereof, and the outer peripheral edge of the distal end of each of the cylindrical members 3 and 30 is tapered into a sharp point.

Although the outer cylinder 2 in the illustrated example is formed by joining the head sides of a pair of gutter-like cylinder members 3 and 30, the present invention is not limited to this. It may also be formed by dividing it across.

However, when the nail of the present invention is pulled into a soft porous material 6 such as foamed concrete, since the material 6 is soft at the beginning of the extraction, the outer cylinder 2 is inserted into the material without separation between the cylinder members 3 and 30. 6. Rush straight into the middle (Maki 4 Figure a).

As the needle tip advances deeper into the material 6, the material located in the entry path is guided into the opening 5 at the tip, is compressed between the inner surface of the outer tube 2 and the center shaft 1, and is compressed by the surrounding material 6. In comparison, the tissue becomes densified and hardened.

Therefore, the reaction force of the hardened material 60 acts outward on the inner surface of each cylindrical material 3, 30, and this force causes the opposing cylindrical materials 3°30 to separate from each other, causing each cylindrical material 3, 30 to move outward. Press and spread (Figure 4b).

As the nail is driven deeper, the capacity of the hardened material 60 increases, and each of the separated tube members 3, 30 curves while being regulated by the washer 4, and is further pushed outward, and when driving is completed, The outer cylinder 2 engages with the driving material 6 in a dovetail shape (Fig. 4c), and in this state, each cylinder 3
, 30 are strongly subjected to the compressive pressure of the hardened material 60 between them, and the frictional resistance between the outer surface of the cylinder and the material 6 increases in proportion to this.

Therefore, this nail exerts a large pulling force that prevents it from being pulled out after being driven.

In addition, in the nail of the present invention, the outer cylinder 2 is made of a material that undergoes plastic deformation (permanent deformation) upon completion of driving into the driving material, and the size, cross-sectional shape, etc. of the nail are appropriately selected so as to obtain an appropriate degree of deformation. As a result, the state of dovetail engagement with the driving material is maintained semi-permanently.

As described above, the present invention includes a plurality of cylindrical members 3,
30 facing each other, the outer cylinder 2 is tightly fitted, and the outer cylinder 2 is
Since the opening 5 is formed between the tip of the nail and the pointed end 12 of the center shaft 1, as the nail is driven into the driving material, each cylindrical member 3
, 30, the material bites and compresses during that time, and opens with a strong compression reaction force, so the pull-out resistance from the poured material increases significantly, and even if the poured material is a soft porous body such as foamed concrete. , there is no risk of the nail falling out.

In addition, since the cylindrical members 3 and 30 gradually open as they enter the material, no excessive force is suddenly applied to the material.
It has excellent effects that achieve the purpose of the invention, such as preventing the material from cracking.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the nail according to the present invention, Fig. 2 is a sectional view taken along line D-0 in Fig. 1, Fig. 3 is an oblique view of the outer cylinder 2, and Fig. 4 a to C are the nails. FIG. 2 is an explanatory diagram showing a typing situation. 1...Center axis, 11...Head, 12...
... Point, 2 ... Outer tube, 3, 30 ...
...Cylinder material.

Claims (1)

[Claims for Utility Model Registration] ■ Consists of a center shaft 1 having a head 11 at one end and a pointed end 12 at the other end, and an outer cylinder 2 that is tightly fitted to the outer peripheral surface of the shaft portion of the center shaft 1. It is formed by connecting a plurality of trough-like cylindrical members 3 and 30 with their head side ends, and each trough-like cylindrical member 3, 30
The total length should match the axial length of the center shaft 1, and the tip and center shaft 1
A nail having an opening 5 formed between it and the pointed end 12 of the nail. 2. The nail according to claim 1, wherein the joint part of the outer cylinder 2 is formed by welding the head side ends of the respective cylinder members 3 and 30.