JP2003322122A - Drive nail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive nail capable of drawing out a nail in a short time without damaging a driven lumber and the like, having small driving resistance at the time of driving, and resisting to a large shearing load in a lateral direction. <P>SOLUTION: In the drive nail 1, a head 2 formed with an engaging portion 10 capable of engaging with a rotating tool is formed on one end side of a shaft 3, and a sharp tip 4 is formed on the other end side of the shaft 3. A smooth portion 7 having no thread is formed on the head 2 side of the shaft 3, and a screw 6 having the generally same length as the length of the smooth portion 7 is formed on the sharp tip side of the shaft 3. The diameter of the smooth portion 7 is formed to be smaller than the diameter of a thread 5 of the screw 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nail for hammering into which timbers are joined by hammering them into each other, and particularly when disassembling the timber after joining, the nail can be easily pulled out without damaging the timber. Regarding nails for driving.

[0002]

2. Description of the Related Art When dismantling wood fixed with ordinary nails, the tip of the nail pulling tool is engaged with the underside of the nail head that is sunk and driven into the surface of the wood, and the nail pulling tool is removed. Using this action as a fulcrum to extract the timber surface, the tip of the nail pulling tool is driven into the timber from the periphery of the nail head that is being driven, and it engages under the nail head. Will give a big scratch to. Further, when the nail is pulled out by the nail pulling tool, the portion serving as the fulcrum is also scratched. Therefore, it is often not possible to reuse the wood after dismantling, which is not preferable in terms of resource saving.

There has already been proposed a nail for driving in which a nail driven into wood is rotated like a screw so as to be removed. As shown in FIG. 6, the conventional driving nail 20 has
A screw thread 22 is formed on the nail shaft portion 21 and an engaging portion 24 for engaging with a driver is formed on the upper surface of the nail head 23. As shown in FIG. 6 (a), the screw thread 22 is formed on almost the entire length of the nail shaft portion 21, or as shown in FIG. 6 (b), the screw thread 22 is formed only on the pointed portion 25 side. It is known that a smooth portion 26 having no screw thread is formed near the nail head 23, and the outer diameter of the screw thread 22 is formed larger than the outer diameter of the smooth portion 26. (For example, see Patent Document 1).

As shown in FIG. 7 (a), when the conventional nail 20 for hammering is driven into the wood W, the screw thread 22 bites into the wood W to increase the holding force. When pulling out, as shown in Fig. 7 (b),
The driving tool T such as a screwdriver is engaged with the engaging portion 24 formed on the upper surface of the nail head 23 to rotate the nail shaft portion 21 so that the nail 20 for driving the wood 20 driven along the thread 22. You are getting out of it. Therefore, a building or the like can be dismantled without damaging the wood W by the nail pulling tool, and the wood after dismantling can be reused.

[0005]

[Patent Document 1] Japanese Patent No. 3218310 (FIGS. 1 and 2)

[0006]

In the above-mentioned conventional driving nail 20, the screw thread 22 is formed on the entire shaft portion 21, or the screw thread 22 is formed only on the tip end side 25, and the screw thread 22 is outside the screw thread 22. The diameter is formed to be larger than the outer diameter of the smooth portion 26, and when the driving nail 20 is rotated from the wood W and pulled out along the screw thread 22, as shown in FIG. It is necessary to rotate the shaft portion 21 until the pointed end portion 25 comes to the surface of the wood W. Therefore, there is a problem that it takes a long time to remove the driving nail 20. Further, when driving the nail 20 for driving into the wood W,
There is also a problem that the screw thread 22 comes into contact with the wood W to be driven and becomes a hammer resistance, which increases the labor of hammering or requires a hammering tool such as a nailing machine having a large ability.

Further, as shown in FIG. 8 (a) using the conventional driving nail 20, when the upper material W1 is fixed to the upper surface of the base material W2, the upper material W1 is attached to the surface of the base material W2. When a large lateral load is applied, a large shear load acts on the shaft portion 21 near the mating surface of the upper material W1 and the base material W2, as shown in FIG. Bends. Therefore, if the screw threads 22 are formed on the shaft portion 21 near the mating surface of the upper material W1 and the base material W2, the shaft portion 21 breaks due to smaller displacement due to stress concentration, and repeated displacement in the lateral direction due to an earthquake or the like occurs. It could not bear a large load.

[0008] The present invention provides a nail for driving, which can remove the nail in a short time without damaging the hammered wood and the like, has little driving resistance at the time of driving, and can withstand a large lateral shear load. Challenge to do.

[0009]

In order to solve the above-mentioned problems, the present invention provides a head having an engaging portion engageable with a rotary tool formed on one end side of the shaft and In a driving nail in which a sharpened tip portion is formed on the other end side, a smooth portion having no thread is formed on the head side of the shaft portion, and the smooth portion is formed on the tip end side of the shaft portion. It is characterized in that a threaded portion having a length substantially the same as the length of the threaded portion is formed, and the outer diameter of the thread of the threaded portion is smaller than the outer diameter of the smooth portion.

According to a second aspect of the present invention, a head having an engaging portion engageable with the rotary tool is formed on one end side of the shaft portion, and a sharpened tip is provided on the other end side of the shaft portion. In a nail for driving in which a portion is formed, a thread portion is formed on the tip end side of the shaft portion, and a smooth portion without a thread is formed on the head side of the shaft portion, and the length of the smooth portion Is set to be longer than the thickness of the upper material to be fastened, and the outer diameter of the thread of the threaded portion is smaller than the outer diameter of the smooth portion.

Further, in the invention of claim 3, the screw thread shape of the screw portion is such that the slope facing the tip of the screw thread is formed at a gentle angle and the slope facing the head side is formed into a steep slope. It is characterized by

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, a driving nail 1 of the present invention is formed with a head portion 2 having an enlarged diameter on one end side, and a shaft portion 3 extending from the head portion 2 toward the other end is continuously formed. A sharp point 4 is formed at the other end of the shaft 3. A screw thread 5 is formed on the outer peripheral surface from the sharp end 4 of the shaft portion 3 toward the head portion 2 side to a substantially central portion, and is configured as a screw portion 6, and the screw portion 6 of the shaft portion 3 is formed.
The shaft portion 3 from the to the head portion 2 is formed in the smooth portion 7 in which the screw thread is not formed.

The length L of the smooth portion 7 of the shaft portion 3
1 is formed to have substantially the same length as the length L2 of the screw portion 6, and the outer diameter D2 of the thread 5 of the screw portion 6 is smaller than the outer diameter D1 of the smooth portion 7. .

As shown in the sectional view of FIG. 2, the thread 5 in the threaded portion 6 has a shape in which a slope 8 directed toward the pointed portion 4 which comes into contact with wood at the time of driving is formed at a gentle angle. The slope 9 facing the head 2 is formed at a steep angle that is almost a right angle. As a result, at the time of hammering, the slope 8 having a gentle angle reduces the hammering resistance, and after the hammering, the slope 9 having a steep angle engages the wood to increase the resistance in the pulling-out direction to enhance the holding force.

On the upper end surface of the head portion 2, an engaging portion 1 is formed so that a rotary tool such as a plus-shaped driver bit can be engaged.
0 is formed, and the driving nail 1 can be rotated by engaging the engaging tool 10 with the rotary tool. The shape of the engaging portion 10 can be arbitrarily selected such as a square or a bit adapted to a plus or minus bit.

The state in which the driving nail of the above embodiment is pulled out from the driven wood will be described below with reference to FIG. As shown in FIG. 3A, the upper material W1 and the base material W2
In the driving nail nailed into the upper surface of the smoothing member 7 and the screw portion, the entire surface is in close contact with the upper material W1 and the base material W2.
And the base material W2 are fixed. In particular, the sloped surface 9 of the thread formed on the threaded portion facing the head 2 side acts so as to bite into the base material W2 to enhance the holding force.

When the rotary tool T such as a driver is engaged with the engaging portion 10 formed on the head 2 of the driving nail 1 to rotate the driving nail 1, as shown in FIG. 3 (b). The nail for driving 1 is pulled out along the thread 5 of the screw portion 6 onto the upper surface of the upper material W1. When the threaded portion 6 of the driving nail 1 passes the portion where the threaded portion 6 was driven, the threaded portion 6 reaches the portion where the smooth portion 7 having an outer diameter larger than the thread 5 is driven, and this portion Since the hole A formed in the upper material W1 and the base material W2 is larger than the outer diameter of the screw portion 6, the screw thread 5 does not engage with the upper material W1 and the base material W2 and the driving nail 1 is fixed to the upper material W1. And can be extracted from the base material W2.

FIG. 4 shows a driving nail 11 according to another embodiment of the present invention. The driving nail 11 of this embodiment is shown in FIG.
Is located between the screw portion 6 and the smooth portion 7 of the shaft portion 3,
A tapered portion 12 is formed to connect the outer diameter D1 of the smooth portion 7 and the outer diameter D2 of the smooth portion 7 to each other. The tapered portion 12
The length L3 is formed such that the sum of the length L3 of the taper portion 12 and the length L1 of the smooth portion 7 is substantially equal to the length L2 of the screw portion 6.

The driving nail 11 according to this embodiment is a driving nail in which the screw portion 6, the taper portion 12 and the smooth portion 7 are used.
It can be easily pulled out by rotating to the part where was driven. Further, since the driving nail 11 is configured to be continuous with the smooth portion 7 by the taper portion 12, when the smooth portion 7 having the large outer diameter is driven into the wood following the screw portion 6 having the small outer diameter. In addition, the taper portion 12 reduces the driving resistance and facilitates the driving.

FIG. 5 shows a driving nail 13 according to still another embodiment. The driving nail 13 of this embodiment has a length L1 of a smooth portion 7 formed on the head 2 side,
Top material W1 fixed by this driving screw nail 13
The thickness L4 is set larger than the thickness L4, and the configuration is the same as that of the embodiment shown in FIG. In this way, the length L1 of the smooth portion 7 is set to the thickness dimension L4 of the upper material W1.
By forming it to a larger size, even if lateral displacement occurs between the upper material W1 and the underlying material W2 fixed by the driving screw nails 13 and a shear load acts on the shaft portion 3, the shear load is applied. Since it can be received by the smooth portion 7 in which the screw thread 5 is not formed, it is possible to withstand a large load without concentration of stress, and it is possible to improve the proof stress due to an earthquake or the like.

[0021]

As described above, according to the present invention, since the thread portion is formed on the shaft portion of the nail for driving, the wood which has been hammered in without damaging the wood etc. by rotating the nail for hammering is used. It is possible to pull it out from the shaft, and a smooth part is formed on the head side of the shaft part of the driving nail, and a screw part is formed on the pointed part side, the thread part having an outer diameter smaller than that of the smooth part. Therefore, by rotating the driving nail and pulling out the screw part from the wood part where the screw part was driven, the screw thread of the screw part engages with the hole formed by the smooth part of the wood. The nails can be pulled out by hand as they no longer match.

Further, since the length of the screw portion and the length of the smooth portion are formed to be substantially the same length, it is not necessary to rotate the tip until the tip comes to the surface of the wood unlike the conventional nail for driving. The nail for driving can be pulled out in about half the time, and the work of pulling out the nail can be performed efficiently.

According to the invention of claim 2, since the length L1 of the smooth portion having no thread is set longer than the thickness dimension L4 of the upper material W1 to be fixed, the upper material W1 Even if a lateral displacement occurs between the base material W2 and a shear load is applied to the shaft portion, the shear load can be received by the smooth portion having no thread, so that it can withstand a large load. Therefore, it is possible to improve the proof stress due to an earthquake or the like.

Further, according to the invention of claim 3, the shape of the thread of the screw portion is such that the slope facing the tip of the screw is formed at a gentle angle and the slope facing the head side is formed into a steep slope. Therefore, the driving resistance at the time of driving can be reduced and the holding force after driving can be enhanced.

[Brief description of drawings]

FIG. 1 is a side view showing a driving nail according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a screw portion of the same driving nail as in FIG.

FIG. 3 is a side view showing a state in which the driving nail of FIG. 1 is driven into (a) wood and (b) extracted from the wood.

FIG. 4 is a side view showing a driving nail according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state where a nail for driving according to still another embodiment of the present invention is driven into wood.

6A and 6B are side views showing a conventional driving nail, in which (a) a thread is formed on the entire shaft portion, and (b) a thread is formed on the tip side.

FIG. 7 is a side view showing a state where a conventional driving nail is driven into (a) wood and (b) a state where it is extracted from the wood.

FIG. 8A is a cross-sectional view of a state in which a conventional driving nail is used for fastening, and FIG. 8B is a cross-sectional view of a state in which a lateral displacement occurs between the fastened upper material and base material.

[Explanation of symbols]

1, 11, 13 nails for driving 2 heads 3 shafts 4 point 5 screw threads 6 screw part 7 Smooth section 8 slopes 9 slopes 10 Engagement part 12 Tapered part T rotary tool L1 smooth length L2 screw length D1 Smooth part outer diameter D2 screw thread outer diameter W1 upper material W2 base material

Continued front page    (72) Inventor Yasushi Nakagawa             6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo             Cos Co., Ltd.

Claims (3)

[Claims] 1. A head having an engaging portion engageable with a rotary tool is formed at one end of the shaft, and a sharpened tip is formed at the other end of the shaft. In the nail for driving, forming a smooth portion not forming a screw thread on the head side of the shaft portion and forming a screw portion of substantially the same length as the length of the smooth portion on the tip side of the shaft portion, A nail for driving, characterized in that an outer diameter of a thread of the screw portion is formed smaller than an outer diameter of the smooth portion. 2. A head portion having an engaging portion engageable with a rotary tool is formed on one end side of a shaft portion, and a sharpened tip portion is formed on the other end side of the shaft portion. In the driving nail, a threaded portion is formed on the tip end side of the shaft portion and a smooth portion having no thread is formed on the head portion side of the shaft portion, and the length of the smooth portion is fixed. A nail for driving, characterized in that it is set longer than the thickness dimension of the upper material, and the outer diameter of the thread of the threaded portion is smaller than the outer diameter of the smooth portion. 3. The screw thread shape of the screw portion is formed such that a slope facing the tip end portion of the screw thread has a gentle angle, and
The nail for driving according to claim 1 or 2, wherein the slope facing the head side is formed as a steep slope.