Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1981-10-13
1984-07-03
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411449, 411495, F16B 1304, F16B 1504
Patent
active
044576510
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the structure of a nail to be driven into wall surfaces, etc. of a building which, after being driven in, exhibits very powerful countering force against its coming out, and which particularly, has large enough resistance or countering effect to its coming out in any base material like expanded concrete which is soft and porous.
DESCRIPTION OF THE PRIOR ART
Old nails were inadequate because they had a smooth circumferential surface around their shanks and such a nail often comes out of the base material into which it has been driven.
In order to prevent this coming out, a nail provided around the circumferential surface of the root of its shank with a means for countering its coming out including spiral grooves, ring-shape grooves or protruded stripes, etc. has been developed. The means for countering the coming out of this type provides adequate countering force against the coming out in such a base material as wood, but in soft, porous materials like expanded concrete, the countering effect against the coming out could hardly be expected because of the small friction between the nail and the base material.
DISCLOSURE OF THE INVENTION
The nail of this invention has a pair of nail shank pieces united face to face through an intermediary of a strip metal, with the facing surfaces of the tip parts of both nail shank pieces being tapered. When this nail is driven into a soft and porous base material as expanded concrete, not only do both nail shank pieces open to both sides, but the metal strip undergoes compressive deformation, thereby holding the opened state from the inside. Accordingly, both nail shank pieces engage the base material in a dovetail fashion, providing powerful countering force against the nail's coming out.
The nail of this invention has a clamping ring which is put around the outer circumference of both nail shank pieces holding the metal strip therebetween. This clamping ring, placed at the surface part of the base material, prevents both nail shank pieces from opening at the base material surface, and aids in both nail shank parts' entering deep into the base material as well as preventing the expansion of the opening made by the nail at the base material surface.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of the nail of this invention;
FIG. 2 is a sectional view of the nail taken along the line II--II of FIG. 1;
FIG. 3 is a front view showing the configuration of the nail when completely driven in; and
FIGS. 4 through 6 are explanatory views showing how the nail driving proceeds.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 through 3 represent the structure of the nail of this invention.
In the nail structure illustrated in the drawings, a pair of nail shank pieces (1) (1) each having a semi-circular shank piece section facing each other with their flat sides turned inwardly, a thin strip metal (2) is interposed entirely between both nail shank pieces (1) (1), and these three parts are closely held together. The metal strip (2) is formed of a metal such as copper, stainless steel, etc., with its width being identical to the width of the nail shank (1), but its length somewhat shorter than the latter's. On the root parts of both nail shank pieces (1) (1), a fixing ring (3) is fit and set to form a nail head part (4). At the tip part of both nail shank pieces (1) (1), respectively, symmetrical tapered surfaces (5) (5) are formed on their facing sides, so that the outer edge sides of the tips of the nail shank pieces (1) (1) are sharp, and an outwardly flaring opening (6) is formed between the facing tapered surfaces (5) (5).
In the nail structure of this invention, a washer-like clamping ring (7) is closely fit on the circumferential surfaces of the bottom parts of both nail shank pieces (1) (1) holding the metal strip (2) therebetween. This clamping ring (7) holds both nail shank pieces (1) (1) and the metal strip (2) in close contact with each other, and as the nail is driven in, the ring is pressed by
REFERENCES:
patent: 1031878 (1912-07-01), Sisk
patent: 1433206 (1922-10-01), Hojnowski
patent: 1680905 (1928-08-01), Mower
patent: 1768670 (1930-01-01), Dedering
patent: 1768721 (1930-07-01), Taylor
patent: 2283243 (1942-05-01), Vatet
patent: 2329744 (1943-09-01), Clarke
patent: 3878756 (1975-04-01), Hallock
patent: 4179975 (1979-12-01), Forcina
Holko Thomas J.
Wakai & Co., Ltd.
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