JP2000320516A - Screw nail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw nail which can have its problem points solved, can be easily driven by hammering, and can be easily extracted even in the case of being violently rotated with a power screwdriver. SOLUTION: This screw nail 1, having a sharply formed tip end part 3, is a screw nail 1 comprising a leg part 2, provided with a helical groove 4 and a head part 7 provided with a fitting groove 8 for loosening and/tightening in the upper surface. Here, the helical groove 4, provided in one streak at a 5 to 30 degrees lead angle, constitutes an angle formed by a screw part side surface 6 in a tip end side and a line which is orthogonal to an axial line in the groove at 65 to 85 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an architectural screw nail which can be easily driven into a material to be driven and which can be easily pulled out.

[0002]

2. Description of the Related Art Nails have been widely used in the construction and repair of houses as a means of joining wood to each other. Such a nail is a building member that is driven into the wood or the like by hitting its head with a hammer, and after being driven, the woods are joined together using the frictional force between the legs of the nail and the wood and firmly fixed. is there.

[0003] When dismantling a building assembled using such nails, the wood cannot be dismantled unless the nails are pulled out in some way, because the woods are firmly fixed with the nails. In the case of dismantling a building built using ordinary nails, it has been customary to pull out nails using nail pullers. However, the method using a nail cutter not only has a problem that the dismantling operation is difficult, but also damages the wood, and the damaged wood cannot be reused as it is.

[0004] As a nail for solving the above problem, an invention of a screw nail is reported in Japanese Patent Application Laid-Open No. Hei 10-331820.

[0005] The screw nail is a nail having a spiral groove formed in a leg portion and a hole in a head portion into which a loosening / fastening tool such as a screwdriver can be fitted.
It is a nail having a structure and function in which a screw and a nail are combined.
Therefore, the screw nail can be easily driven into wood or the like by hitting the head with a hammer like a normal nail, while if a screwdriver is inserted into a hole in the head and rotated, it is similar to a screw. It has a function that can be pulled out without damaging wood or the like.

However, the use of an electric screwdriver or an air screwdriver for improving the workability of the screw nail has a problem that the hole becomes large and the nail cannot be pulled out. In other words, when the screw nail is rotated violently using an electric screwdriver or the like, the mountain of the groove formed in the leg of the screw nail cuts off the wood or the like biting into the groove and enlarges the hole. However, there is a problem in that the nail does not engage with the wood and cannot function as a screw, and the nail cannot be pulled out merely by idling.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional screw nail, which can be easily driven by hitting with a hammer, and can be rotated intensely with an electric screwdriver. It is an object of the present invention to provide a screw nail that can be easily pulled out.

[0008]

SUMMARY OF THE INVENTION A screw nail according to the present invention has a sharply formed tip end, a leg provided with a spiral groove, and a fitting groove for loosening and fastening on the upper surface. A screw nail comprising a head provided, wherein the spiral groove is provided in a single line with a lead angle of 5 to 30 degrees, and is perpendicular to the axis and the side surface of the thread portion on the tip side of the groove. The angle between the line and the line is 65 to 85 degrees.

When the groove is provided only in a part of the leg, it is preferable that the outer diameter of the threaded portion in the portion provided with the groove is larger than the outer diameter of the portion in which the groove is not provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a front view showing an example of a screw nail 1 of the present invention, FIG. 2 is a partially enlarged view of a groove provided in a leg, and FIG. 3 is a plan view. In FIG. 1, 2 is a screw nail leg, 3 is a tip of a sharply formed leg,
Reference numeral 4 denotes a single groove formed in the leg, 5 denotes a thread, 6 denotes a side surface of the screw, 7 denotes a head, and 9 denotes a portion where the groove of the leg is not provided. In FIG. 3, reference numeral 8 denotes a fitting groove for loosening / fastening a driver or the like provided on the upper surface of the head 7.

The tip 3 of the leg 2 of the screw nail of the present invention
Are sharply formed as shown in FIG. The angle α of the tip 3 is preferably formed in the range of 30 to 60 degrees.
By forming the distal end portion 3 sharply in this way, the position where the screw nail is driven can be clearly determined, and the material to be driven can be prevented from breaking.

The groove 4 provided in the leg 2 is a single groove. If the number of grooves is increased, the distance between the threads of the grooves becomes narrower, so that when the nail is pulled out using an electric screwdriver or the like, the threads 5 of the grooves may undesirably scrape wood or the like.

The lead angle β of the groove 4 (shown in FIG. 2).
Is preferably 5 to 30 degrees, more preferably 7 to 25 degrees, and particularly preferably 10 to 20 degrees. With such a configuration of the lead angle β, even if the screw nail is rotated violently using an electric screwdriver or the like, the nail can be easily pulled out without scraping off the wood or the like. When the lead angle β is configured as described above, the force required for pulling out the nail can be reduced due to the principle of leverage. Therefore, even when the screw nail of the present invention is to be pulled out only by hand, it can be more easily pulled out than the conventional screw nail having a lead angle larger than the friction angle. Lead angle is 3
When the angle exceeds 0 degrees, when the screw nail is rotated violently with an electric screwdriver or the like, the hole for driving the nail is cut off by shaving wood or the like, so that the screw thread 5 engages with the material to be driven such as wood. There is a possibility that the nails will not be able to come out just by idling. On the other hand, when the lead angle is less than 5 degrees, the workability of pulling out the nail is deteriorated, and there is a possibility that the meaning of providing the groove may be lost.

The angle γ (shown in FIG. 2) between the thread side surface 6 on the tip end side of the groove 4 and a line perpendicular to the axis is 65.
Is preferably 85 to 85 degrees, more preferably 68 to 84 degrees, and 7 degrees.
Particularly preferred is 1 to 83.5 degrees. Angle γ of screw part side surface 6
When the lead angle β of the groove 4 is less than the friction angle of the material to be driven, such as wood, that is, about 30 degrees or less, the conventional screw nail having a lead angle larger than the friction angle of the material to be driven. Can be easily driven in as well. If the angle γ is less than 65 degrees, the screw nail may not be easily driven. On the other hand, if the angle γ exceeds 85 degrees, it is easy to drive the nail in, but the function as a screw may be small and the nail may not be easily pulled out.

The head 7 is preferably circular like a normal nail, but may be polygonal, such as a square. The head 7 is provided with a fitting groove 8 for loosening / fastening a driver or the like. The shape of the fitting groove 8 is usually a + shape or a-shape, but may be a polygon as long as a tool such as a screwdriver can be fitted therein.

The groove 4 can be provided over the entire length of the leg portion 2 or can be provided only partially. Groove 4
Is provided only on a part of the leg portion, it is preferable that the outer diameter D of the screw portion is larger than the outer diameter d of the portion where the groove is not formed. Specifically, it is preferable that the ratio of the screw portion outer diameter D to the outer diameter d of the portion where no groove is formed is D / d = 1.0 to 1.2, and D / d = 1.022. To D / d = 1.025 to 1.14.
It is particularly preferred that When D / d is less than 1.0,
When the screw nail is driven into the material to be driven, the diameter of the hole formed in the material to be driven may be larger than the outer diameter D of the screw portion. As a result, even if the screwdriver is inserted into the hole in the head and rotated, the screw thread 5 and the wood or the like may not engage with each other, and the nail may only be turned idle and cannot be easily pulled out. When D / d exceeds 1.2, there is a possibility that the strength of the leg portion where the groove is not formed is not sufficiently obtained.

The length L of the leg of the nail (excluding the length L1 of the sharp tip 3) and the length l of the portion where the groove 4 is provided
Can be appropriately determined depending on the type of the material to be driven, the diameter of the nail, and the length of the nail, and it is preferable that the longer the L, the shorter the l. Specifically, when L is 25 mm or less, it is preferable that 1 / L = 1.0, that is, all screws, and when L is 25 to 50 mm, 1 / L = 0.4 to 1..
When 0 and L exceed 50 mm, it is preferable to set 1 / L = 0.3 to 0.7. However, the screw nail of the present invention,
It is not limited to these values. In the case where the groove 4 is formed only in a part of the leg, it is preferable that the sharply formed portion 3 of the tip and the groove 4 are provided continuously.

The preferred dimensions of the screw nail 1 in the present invention are as follows: the total length L ₀ is 50 mm, the length L of the leg 2 is 47 mm, and the length l of the portion provided with the groove 4 is 25 m.
m, the length L1 of the tip 3 of the leg 2 is 5.5 mm, the angle α of the tip 3 is 25 degrees, the lead angle β of the groove 4 is 10 degrees, and the angle γ of the thread portion side surface 6 of the groove 4 is At 83 degrees, the outer diameter D of the screw portion is 3.6 mm, the outer diameter d of the portion of the leg 2 where the groove 4 is not provided is 3.2 mm, and the outer diameter D1 of the head 5 is 8 mm.
However, these are examples of the screw nail of the present invention, and the present invention is not limited to these.

The material of the screw nail of the present invention is preferably a metal such as iron, stainless steel, titanium and aluminum, but the present invention is not limited to these.

[0020]

As described above, in the screw nail of the present invention, the tip of the leg is sharply formed, and the leg is provided with a spiral groove, and the groove has a lead angle of 5 to 30. Degrees, provided in a single line, the angle between the side surface of the thread portion on the tip side of the groove and a line perpendicular to the axis is 65 to 80 degrees,
Since the head has a fitting groove for relaxation and fastening,
If you hit the head with a hammer, especially an electric hammer, you can easily drive into the material to be driven, such as wood, and if you use an electric screwdriver or air driver, you can easily pull out the nail without damaging the wood etc. it can.

In the screw nail according to the present invention, in which a groove is provided only in a part of the leg portion, since the outer diameter of the screw portion is formed larger than the outer diameter of the portion where the groove is not provided, the screw nail is too large for the material to be driven. No holes are made. Therefore, even if the nail is violently rotated using an electric screwdriver or the like, the screw thread and the wood or the like are firmly engaged with each other so that the nail does not idle, so that the nail can be easily pulled out.

The screw nail of the present invention can be preferably used when driven with an electric hammer and pulled out with an electric screwdriver or the like, but even when driven by hand, it is as easy as a conventional screw nail. It can be driven in by hand, and even when pulled out by hand, it can be pulled out more easily than a conventional screw nail by the leverage principle.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an example of a screw nail of the present invention.

FIG. 2 is a partially enlarged view of a groove provided in the screw of FIG.

FIG. 3 is a plan view illustrating an example of the screw nail of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 screw nail 2 leg 3 tip of leg 4 groove 6 screw side of tip side 7 head 8 fitting groove for relaxation / fastening 9 part where groove of leg is not provided

Claims (2)

[Claims] 1. A screw nail having a sharply formed distal end, a leg provided with a spiral groove, and a head provided with a fitting groove for loosening and fastening on the upper surface. The spiral groove has a lead angle of 5 to 30 degrees and is formed in a single line, and the angle between the thread side surface on the tip side of the groove and a line perpendicular to the axis is 65 to 85 degrees. A screw nail characterized by having a screw nail. 2. The method according to claim 1, wherein the groove is provided only in a part of the leg, and the outer diameter of the threaded portion at the portion where the groove is provided is larger than the outer diameter of the portion where the groove is not provided. The screw nail as described.