Abstract
A nail that is configured by: a nail main body composed of a soft iron material in which a head portion is formed in an upper end portion of a columnar body; and a tip end portion having a circular conical shape or a polygonal pyramidal shape that is formed in a lower end portion of the nail main body, in which the tip end portion is subjected to a tip end portion hardening treatment by quenching or plastic forging. The nail meets the Japanese Industrial Standards, is capable of being driven in a straight manner even when the tip end portion hits a hard knot, and is capable of being manufactured with relative ease.
Claims
1. A nail comprising: a nail main body consisting of a soft iron material in which a head portion is formed in an upper end portion of a columnar body; and a tip end portion having a circular conical shape or a polygonal pyramidal shape or a bombshell-shaped conical shape formed in a lower end portion of the nail main body, wherein only part of the tip end portion is subjected to a hardening treatment, the soft iron nail not otherwise being subjected to a hardening treatment, and the hardening treatment is by quenching or plastic forging and wherein the tip end portion has only one end face and the end face of the tip end portion is at an extreme end of the tip end portion and consists of a flat surface in a single plane orthogonal to a lengthwise axis of the columnar body and extending continuously across the entire end face including an entire periphery of the end face where the end face meets side faces of the tip end portion and wherein all radial cross-sections of the columnar body are of a same shape and, except at the head portion and the tip end portion, are of a same size, and the part of the tip end portion subjected to the hardening treatment includes the end face and a part of the tip end portion contiguous with the circumference of the end face and excludes a part of the tip end portion contiguous with the circumference of the columnar body where the radial cross-sections of the columnar body are of the same shape and the same size.
2. The nail according to claim 1, wherein: the columnar body is formed into a shape of a circular column or a polygonal column; and the tip end portion formed into any of a circular conical shape, a bombshell-shaped conical shape, a triangular pyramidal shape, and a square pyramidal shape.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) FIG. 1 is a front view according to a first embodiment for carrying out the present invention;
(2) FIG. 2 is a bottom view according to the first embodiment for carrying out the present invention;
(3) FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1;
(4) FIG. 4 is an explanatory diagram of a state in which a tip end portion hardening-treatment portion according to the first embodiment for carrying out the present invention is formed;
(5) FIG. 5 is an explanatory diagram of a state of use according to the first embodiment for carrying out the present invention;
(6) FIG. 6 is a front view according to a second embodiment for carrying out the present invention;
(7) FIG. 7 is a bottom view according to the second embodiment for carrying out the present invention;
(8) FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6;
(9) FIG. 9 is a front view according to a third embodiment for carrying out the present invention
(10) FIG. 10 a bottom view according to the third embodiment for carrying out the present invention;
(11) FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 9;
(12) FIG. 12 is a front view according to a fourth embodiment for carrying out the present invention;
(13) FIG. 13 a bottom view according to the fourth embodiment for carrying out the present invention;
(14) FIG. 14 is a cross-sectional view taken along line 14-14 in FIG. 12;
(15) FIG. 15 is a front view according to a fifth embodiment for carrying out the present invention;
(16) FIG. 16 a bottom view according to the fifth embodiment for carrying out the present invention;
(17) FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 15;
(18) FIG. 18 is a front view according to a sixth embodiment for carrying out the present invention;
(19) FIG. 19 a bottom view according to the sixth embodiment for carrying out the present invention; and
(20) FIG. 20 is an explanatory diagram of a state in which a tip end portion hardening-treatment portion according to the sixth embodiment for carrying out the present invention is formed.
DETAILED DESCRIPTION OF THE INVENTION
(21) The present invention will be described in detail based on embodiments for carrying out the present invention shown in the drawings.
(22) According to a first embodiment for carrying out the present invention shown in FIG. 1 to FIG. 5, reference number 1 represents a nail of the present invention that is composed of a soft iron material. The nail 1 is configured by a main nail body 4 and a tip end portion 5. In the main nail body 4, a head portion 3 is formed in an upper end portion of a cylindrical columnar body 2. The tip end portion 5 is formed in a lower end portion of the main nail body 4 and has a circular conical shape. As shown in FIG. 4, heat treatment by quenching is performed on the tip end portion 5, and a tip end portion hardening-treatment portion 6 is thereby formed.
(23) When the nail 1, configured as described above, is driven into a piece of lumber 8 at location where a knot 7 is present, the tip end portion 5 of the nail 1 can be easily driven to the location of the knot 7. In addition, even in the knot 7 portion, the tip end portion hardening-treatment portion 6 that has been hardened by quenching can be driven straight without drawing away from the knot 7, as shown in FIG. 5. Connection by the nail 1 can be reliably performed.
(24) [Other Embodiments for Carrying Out the Invention]
(25) Next, other embodiments for carrying out the preset invention, shown in FIG. 6 to FIG. 17, will be described. In the descriptions of the other embodiments for carrying out the present invention, constituent sections that are identical to those according to the above-described first embodiment for carrying out the present invention are given the same reference numbers. Redundant descriptions are omitted.
(26) According to a second embodiment for carrying out the present invention, shown in FIG. 6 to FIG. 8, the main difference from the above-described first embodiment for carrying out the present invention is that a bombshell-shaped conical tip end portion 5A is formed in the lower end portion of the nail main body 4. The tip end portion 5A is shaped such that a tip end portion of a bombshell is horizontally fractured. Working effects similar to those according to the above-described first embodiment for carrying out the present invention can also be achieved by a nail 1A in which the tip end portion 5A is formed in this manner.
(27) According to a third embodiment for carrying out the present invention, shown in FIG. 9 to FIG. 11, the main differences from the above-described first embodiment for carrying out the present invention are that a columnar body 2A is used and a tip end portion 5B is formed in a lower end portion. The columnar body 2A is formed into the shape of a rectangular column, as a polygonal column. The tip end portion 5B has a square pyramidal shape. Working effects similar to those according to the above-described first embodiment for carrying out the present invention can also be achieved by a nail 1B configured in this manner.
(28) According to a fourth embodiment for carrying out the present invention, shown in FIG. 12 to FIG. 14, the main differences from the above-described first embodiment for carrying out the present invention are that a columnar body 2B is used and a tip end portion 5C is formed in a lower end portion. The columnar body 2B is formed into the shape of a triangular column, as a polygonal column. The tip end portion 5C has a triangular pyramidal shape. Working effects similar to those according to the above-described first embodiment for carrying out the present invention can also be achieved by a nail 1C configured in this manner.
(29) According to a fifth embodiment for carrying out the present invention, shown in FIG. 15 to FIG. 17, the main difference from the above-described first embodiment for carrying out the present invention is that the tip end portion 5B is formed in the lower end portion of the nail main body 4. The tip end portion 5B has a square pyramidal shape. Working effects similar to those according to the above-described first embodiment for carrying out the present invention can also be achieved by a nail 1D configured in this manner.
(30) According to a sixth embodiment for carrying out the present invention, shown in FIG. 18 to FIG. 20, the main difference from the above-described first embodiment for carrying out the present invention is that the tip end portion 5 having the circular conical shape is formed into a tip end portion hardening-treatment portion 6A by plastic forging, as shown in FIG. 20. Working effects similar to those according to the above-described first embodiment for carrying out the present invention can also be achieved by a nail 1E in which the tip end portion hardening-treatment portion 6A is formed in this manner.
INDUSTRIAL APPLICABILITY
(31) The present invention is used in an industry for manufacturing nails.
