JP6869598B2 - nail - Google Patents

Description

The invention relates to nails driven into wood.

A nail is generally used to bond the wood to each other, and the wood is driven into the wood using a nail gun described in Patent Document 1 that operates with a mallet, air pressure, or the like. As for the shape of the nail that is generally used, the tip 1002 of the shaft portion 1001 to be driven into the wood is pointed like a spire like the nail 1000 shown in FIG. 12 (a), and the head 1003 to be hit is hit. It forms a disc-shaped seat for this purpose. The tip 1002 is sharpened in a spire shape in order to reduce the resistance when driving into the wood M. Further, the boundary (connecting portion) 1004 between the shaft portion and the head portion is gently connected by a conical tapered surface or a curved surface.
However, the nail 1000 having the tip 1002 sharpened in a spire shape pushes the wood fibers away and invades when driving, and has the effect of pushing the wood from the inside by the cone-shaped 1004. Therefore, as shown in FIG. 12B, cracks 1005 often occur in the wood. If cracks occur in the portion where the nail is driven in this way, the strength of fastening the wood deteriorates.

In addition, the direction in which conventional nails are driven is fixed. That is, since the tip is sharp and the hit portion at the rear end has a head whose diameter is larger than the thickness of the shaft, when using it for a nail gun or the like, it is connected with a wire to align the nails. It is necessary to supply it in a state where it is made to run.

Japanese Unexamined Patent Publication No. 2001-138262

The present invention has been invented in view of the above problems, and an object of the present invention is to provide a nail that is hard to break even when driven first. Another object of the present invention is to provide a nail that is hard to break even when driven and can be driven from either the front end or the rear end of the shaft.

In order to solve the above problems, the nail according to the present invention has the following features. That is,
The tip of the shaft is formed in a non-spiers shape, and the striking part at the opposite end is formed in a non-spier shape like the tip, or a disc shape without a conical tapered surface or curved surface at the boundary with the shaft. It is characterized by forming the head of.

In the nail according to the present invention, the tip portion of the shaft to be driven into wood is not formed in a spire shape. Further, it does not have a conical tapered surface or a curved surface at the boundary between the shaft portion and the head portion. This makes it difficult for the nails driven into the wood to spread the fibers of the wood, and has the effect of preventing the wood from cracking.
Further, the fact that the tip surface of the shaft does not have to be formed in a spire shape means that both end faces of the shaft can be formed into a flat surface or a flat surface having substantially the same shape as the flat surface. It has the effect of being able to form a symmetrically shaped nail with no distinction between the rear end and the rear end.

It is explanatory drawing of the nail which concerns on 1st Example. It is explanatory drawing of the nail which concerns on 2nd Example. It is explanatory drawing of the nail which concerns on 3rd Example. It is explanatory drawing of the nail which concerns on 4th Example. It is an enlarged view of the tip part of the nail which concerns on 4th Example. It is explanatory drawing of the nail which concerns on 5th Example. It is a perspective view of the nail which concerns on 5th Example. It is explanatory drawing of the nail which concerns on 6th Example. It is explanatory drawing of the nail which concerns on 7th Example. It is explanatory drawing of the nail which concerns on 8th Example. It is explanatory drawing about the action of the nail which concerns on 8th Example. It is explanatory drawing which showed the use example of the conventional spire type nail.

(First Example)
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The nail 1 is an explanatory view showing an example of a nail having no spire portion at the tip. The nail 1 has a shaft portion 2 that is long with respect to the diameter, and the tip 3 of the shaft portion 2 is formed as a flat surface forming a right-angled surface with respect to the longitudinal direction of the shaft portion 2. Further, the rear end 4 of the shaft portion 2 is also formed as a flat surface forming a plane perpendicular to the longitudinal direction of the shaft portion 2. Further, a rough surface portion 5 made of spiral ridges is provided on the surface of the shaft portion 2 extending from the vicinity of the front end 3 and the rear end 4 toward the center.

In the present embodiment, the rough surface portion 5 is formed as a spiral ridge similar to the screw thread formed on the bolt, and the nail 1 driven into the wood can be moved forward and backward by the rotation of the shaft portion 2. It has become a thing. The shape of the rough surface portion 5 and the amount of protrusion from the surface of the shaft 2 are appropriately set according to the thickness of the nail 1 and the length of the shaft portion, but are approximately 0.5 mm. The material constituting the nail 61 is a general material for nails such as iron and stainless steel.
Further, the shapes and positions of the front end 3, the rear end 4, and the rough surface portions 5 and 5 formed in the vicinity thereof are provided at positions substantially symmetrical with respect to the intermediate portion of the shaft portion 2. That is, there is no distinction in the vertical direction shown in FIG. 1, and either the front end 3 or the rear end 4 may be driven into the wood.

Further, the nail 1 also has a structural feature that the intermediate portion of the shaft portion 2 does not have spiral ridges such as the rough surface portions 5 and 5. That is, if a shape such as a constriction or a seam is formed on the surface of the shaft portion, the shearing force at that portion may decrease. In order to prevent such a decrease in shearing force, the nail 1 according to the present embodiment has a cylindrical shape on the central surface of the shaft portion 2 without an extreme change in shape.
In the illustrated example, the shaft portion is formed as a solid rod-shaped body, but the shaft portion may be formed in a tubular shape by providing a hole along the shaft core. Further, this hole may be formed in a tubular shape by providing a through hole extending over the entire shaft or a hole from the tip to a predetermined depth.

A general nail has a sharp tip and a disk-shaped striking surface (head) widened in the diameter direction of the shaft is formed at the rear end, which inevitably determines the direction in which the nail is driven. Will be done. Further, the boundary (connecting portion) between the shaft portion and the head portion is gently connected by a conical tapered surface or a curved surface.
When such a conventional nail is driven into wood, it penetrates while spreading the fibers of the wood. Further, when the head of the nail having the above-mentioned conical tapered surface or curved surface is driven in, the fibers are further expanded, which causes cracks in the wood.
However, the nail 1 according to the present embodiment has little effect of spreading the wood fibers because it invades while crushing the wood fibers when it is driven into the wood. Further, even if the nail 1 is driven to the end of the wood, since the tapered surface and the curved surface are not formed on the head, the fibers of the wood are not spread and the wood is not cracked. There is.

(Second Example)
FIG. 2 is an explanatory view of a second embodiment regarding a nail having no spire portion at the tip. The nail 10 shown in FIG. 2 has a shaft portion 12 that is long with respect to the diameter. Both end faces 13 and 14 of the shaft portion 12 are formed as flat surfaces orthogonal to the shaft portion 12 without forming a spire, and a spiral convex shape is formed on the shaft portion of a portion close to both ends 13 and 14. A rough surface portion 15 having a plurality of steps of strips or annular convex strips is provided. The shape of the rough surface portion 15 and the amount of protrusion from the surface of the shaft 12 are appropriately set according to the thickness of the nail 10 and the length of the shaft portion 12, and are approximately 0.5 mm.
Further, the rough surface portions 15 and 15 formed in the vicinity of both ends are provided at positions substantially symmetrical with respect to the center of the shaft portion 12. The material constituting the nail 10 is a general material as a nail such as iron or stainless steel.

Further, both end surfaces 13 and 14 are provided with square grooves 16 having a rectangular cross section in the radial direction. It should be noted that a V-shaped groove may be used instead of the rectangular groove. Other than that, as long as it has the same purpose as that of the above embodiment, a groove having another shape may be formed. It is desirable that the square groove 16 is formed so as to be usable as a groove that can be engaged with the tip bit of a flat-blade screwdriver. That is, the nail 10 is driven by hitting with a mallet or the like, but when the amount of driving is insufficient and the end face 13 or the end face 14 has a little wood protruding, it can be screwed in using a flat-blade screwdriver. Can be formed as follows. Also, by forming it so that it can be screwed in using a flat-blade screwdriver, it can also play the role of a screw (screw) by driving it while rotating it.
In the illustrated example, the shaft portion is formed as a solid rod-shaped body, but the shaft portion may be formed in a tubular shape by providing a hole along the shaft core. Further, this hole may be formed in a tubular shape by providing a through hole extending over the entire shaft or a hole from the tip to a predetermined depth.

Further, when the nail 10 is driven into the wood, the end face 13 or the end face 14 on which the square groove 16 is formed is hit with a mallet or the like. At this time, the end face is deformed so as to be slightly opened around the square groove 16 by tapping. The amount of deformation varies depending on the size of the square groove 16 and the physical properties of the material constituting the nail, but it is deformed in the direction of slightly increasing the diameter of the end portion so as not to cause cracking of the wood. The deformation of the end face 13 or the end face 14 has an effect of preventing the timber bonded from the end of the driven nail 10 from rising or falling out. Further, since the rough surface portion 15 also has a friction effect with the wood, the effect of preventing the wood from floating or coming off is enhanced.

The action of the nail 1 and the nail 10 shown in the first embodiment and the second embodiment.
In addition to the case where the nail is driven perpendicular to the surface of the timber to be bonded, the nail may be driven at an inclination of about 45 degrees with respect to the surface of the wood. This is because by making the direction in which the wood is bonded and the direction in which the nail is driven (the angle of the shaft portion) different, the action of increasing the resistance in the peeling direction is produced and the bonding can be strengthened. In addition, when there is no work space for swinging a mallet and it is not possible to drive vertically, the nail may be driven diagonally.

As described above, when a nail is struck diagonally with respect to the wood, the pointed portion of the nail may not easily come into contact with the wood, and the tip may slip on the surface of the wood and the driving position may shift.
On the other hand, in the nail 1 according to the first embodiment and the nail 10 according to the second embodiment, the tip to be driven into the wood is orthogonal to the shaft portion, unlike the conventional nail having a sharp tip. Therefore, when the nail 1 and the nail 10 are started to be driven into the wood, the edge of the tip first comes into contact with the wood and bites into the wood. Therefore, the driving position does not shift without the tip slipping on the surface of the wood. As described above, the nail 1 and the nail 10 have an effect that the nail 1 and the nail 10 can be driven into a target position without slipping the tip even when the nail is driven obliquely with respect to the wood.

Further, the above-mentioned nail 1 and nail 10 can also be used in a nail driving machine that drives a nail by power.
When using conventional nails for a nail gun, the direction of the nails to be stored in the magazine is adjusted, and the nails are connected and fixed with wires to maintain the distance between the nails and prevent the heads from overlapping. In many cases, the method of is adopted.
However, in the case of the nail 1, the driving direction may be either the tip 3 or the rear end 4, and in the case of the nail 10, the driving direction may be either the end face 13 or the end face 14. Further, both have a symmetrical shape along the axial direction, and there is no bulging portion called a head. For this reason, the nails need only be attached to the nail gun in the same axial direction, and since they do not have a head, it is not necessary to arrange the nails at different heights in advance along the axial direction.
Therefore, when a nail such as a nail 1 or a nail 10 is used, a nail driving machine structure that increases the number of nails accommodated in the magazine becomes possible, and a nail driving machine that improves work efficiency is formed. It has the effect of making it possible to do so. Further, depending on the structure, it is possible to form a nailing machine having a structure in which the nails do not need to be connected to each other or arranged in an aligned manner and are stored in a magazine in a bulk.

(Third Example)
FIG. 3 is an explanatory view of another example relating to a nail having no spire portion at the tip. The nail 20 shown in FIG. 3 has a shaft portion 22 that is long with respect to the diameter, the tip surface 23 of the shaft portion 22 is configured as an entry portion for wood, and the rear end is a hammer or a driver of a nailing machine. It is configured as a disc-shaped striking portion 24 having a diameter larger than that of the shaft portion 22 to be struck by.
The tip 23 of the nail 20 is formed as a flat surface orthogonal to the shaft portion 22 without forming a spire. The material constituting the nail 20 is a general material as a nail such as iron or stainless steel.
In the illustrated example, the shaft portion is formed as a solid rod-shaped body, but the shaft portion may be formed in a tubular shape by providing a hole along the shaft core. Further, as in the above-described embodiment, the structure may be such that the disc-shaped head is not provided as the striking portion.

The nail 20 is provided with a rough surface portion 25 in which a plurality of spiral ridges or annular ridges are provided on the shaft portion of a portion close to the striking portion 24. The rough surface portion 25 has an effect of generating a frictional force with the wood after driving the nail 20 into the wood and making it difficult for the nail 20 to come off.
The striking portion 24 is formed as a disk-shaped head having an outer diameter larger than that of the shaft portion 22. The feature of the nail 20 is that the boundary portion extending from the shaft portion 22 to the striking portion 24 which is the head does not form a conical tapered surface or a curved surface that gently connects the two, and the boundary portion is close to a right angle. It is formed in a shape. This has the effect that when the nail 20 is driven to the striking portion 24, the striking portion 24 sinks in the wood surface in the axial direction and presses the bonded wood along the axial direction so as not to come out. However, since the side surface does not have a conical tapered surface or a curved surface and does not cause the action of spreading the wood fibers in the direction orthogonal to the shaft portion 22, cracking of the wood can be suppressed. There is.

(Fourth Example)
4 and 5 are explanatory views of another example relating to a nail having no spire at the tip. FIG. 4 shows a cross section of the nail 30, which has a shaft portion 32 that is long with respect to the diameter, the tip 33 of the shaft portion 32 is configured as an entry portion for wood, and the rear end is a mallet or a nailing machine. It is configured as a disc-shaped striking portion 34 having a diameter larger than that of the shaft portion 32 that is struck by the driver of the above.
FIG. 5 is an enlarged view of part A shown in FIG. The tip surface 33 of the nail 30 is formed as a spherically recessed recess. Therefore, the outer peripheral edge 35 of the tip surface 33 forms an edge, and when the wood is driven into the wood, the outer peripheral edge 35 of the tip surface 33 cuts off the fibers of the wood and invades the wood. Further, even when the nail 30 is driven from an inclined direction with respect to the wood surface, the outer peripheral edge 35 forming the edge bites into the wood, so that the tip portion does not slip on the wood surface and the driving position does not shift. have.
Instead of the spherically recessed recess, a conical (funnel-shaped) recess may be formed. Further, a hole may be provided along the shaft core to form the shaft portion in a tubular shape. Further, this hole may be formed in a tubular shape by providing a through hole extending over the entire shaft or a hole from the tip to a predetermined depth.

(Fifth Example)
6 and 7 are explanatory views of another example regarding a nail having no spire at the tip. FIG. 6A shows a front view of the nail 40, and FIG. 6B shows a side view of the nail 40. Further, FIG. 7 is a perspective view of the nail 40 as viewed from the tip direction.
The nail 40 has a shaft portion 42 that is long with respect to the diameter, the tip 43 of the shaft portion 42 is configured as an entry portion to the wood, and the rear end is a shaft portion that is hit by a mallet or a driver of a nailing machine. It is configured as a disc-shaped striking portion 44 having a diameter larger than 22.

The tip 43 of the nail 40 is formed with a groove orthogonal to the shaft portion 42 having an arcuate cross section having a diameter larger than that of the shaft portion 42 on the entire end surface. As a result, in the figure shown in FIG. 5 (a) which is a front view, the shape of the groove looks like a curved concave shape, and in the figure shown in FIG. 6 (b) which is a side view, the outer edge of the tip 43 is curved. It looks like a convex shape.
When it is driven into wood, the outer peripheral edge 45 of the tip surface 43 cuts off the fibers of the wood and invades the wood. In particular, when a concave groove is formed by a curved surface, protruding sharp edges 45 are formed on both sides of the groove, and the edges make it easier to cut off the fibers of the wood and easily invade the wood.

Although the nail 40 has a groove having an arcuate cross section on the end face, it may be a V-shaped groove. Other than that, as long as it has the same purpose as that of the above embodiment, a groove having another shape may be formed.
Further, the nail 40 does not form a tapered surface or a curved surface that gently connects the two at the boundary portion extending from the shaft portion 42 to the striking portion 44 which is the head, and the boundary portion is formed in a shape close to a right angle. doing. The action and effect of this shape are the same as in the above-mentioned example, and it makes it difficult for wood to crack.
In the illustrated example, the shaft portion is formed as a solid rod-shaped body, but the shaft portion may be formed in a tubular shape by providing a hole along the shaft core. Further, this hole may be formed in a tubular shape by providing a through hole extending over the entire shaft or a hole from the tip to a predetermined depth.

(6th Example)
FIG. 8 is an explanatory view of another example relating to a nail having no spire portion at the tip. The nail 50 shown in FIG. 8 has a shaft portion 52 that is long with respect to the diameter, the tip surface 53 of the shaft portion 52 is configured as an entry portion for wood, and the rear end is a hammer or a driver of a nailing machine. It constitutes a disc-shaped striking portion 54 having a diameter larger than that of the shaft portion 52 to be struck by. The shape and action of the striking portion 54 are the same as in the other examples described above.
The tip 53 of the shaft portion 52 forms a plane orthogonal to the shaft portion 52, and a single square groove 55 is formed in the center of the plane. When the nail 50 is driven into wood, the outer peripheral edge 56 of the tip surface 53 cuts off the fibers of the wood and penetrates the nail 50.
In the illustrated example, the shaft portion is formed as a solid rod-shaped body, but the shaft portion may be formed in a tubular shape by providing a hole along the shaft core. Further, this hole may be formed in a tubular shape by providing a through hole extending over the entire shaft or a hole from the tip to a predetermined depth.

(Example 7)
FIG. 9 is an explanatory view of another example relating to a nail having no spire portion at the tip. The nail 60 shown in FIG. 9 has a shaft portion 62 that is long with respect to the diameter, the tip surface 63 of the shaft portion 62 is configured as an entry portion for wood, and the rear end is a hammer or a driver of a nailing machine. It constitutes a disc-shaped striking portion 64 having a diameter larger than that of the shaft portion 62 to be struck by.
The tip 43 of the shaft portion 62 forms a plane orthogonal to the shaft portion 62, and a hole 45 is formed in the center of the shaft portion 62. That is, the nail 60 has a hollow shape like a pipe.
As in the first and second embodiments described above, the structure may be such that the disc-shaped head is not provided as the striking portion.

When the nail 60 is driven into wood, the outer peripheral edge 66 of the tip surface 63 cuts off the fibers of the wood and penetrates the nail 60. Further, since the nail 60 further has a hole 65 in the shaft core portion, a part of the wood compressed by the tip surface 63 when the nail 60 is driven into the wood is filled in the hole 65.
If the shaft core is formed in a hollow shape, it easily penetrates into the wood. Further, although the shear strength of the nail is reduced, it is reinforced by filling the hole 65 with wood at a high pressure, so that the effect of increasing the shear strength of the nail is produced.

(Example 8)
FIG. 10 shows an external view of the nail 70 according to the present embodiment. The nail 70 has a shaft portion 72 that is long in diameter, the tip 73 of the shaft portion 72 is configured as an intrusion portion into wood, and the rear end is a shaft portion that is hit by a mallet or a driver of a nailing machine. It constitutes a disc-shaped striking portion (head) 74 having a diameter larger than 72.
The tip 73 of the nail 70 is formed as a flat surface orthogonal to the shaft portion 72 without forming a spire. The tip 3 may be a shape as long as it can be regarded as substantially flat, and may have a shape such that the outer peripheral edge of a circle is slightly chamfered.
The material constituting the nail 70 is a general material for nails such as iron and stainless steel.

The tip 73 of the nail 70 is formed or has a flat surface on a flat surface orthogonal to the shaft portion 72. FIG. 11 is an explanatory view showing an image of a state in which the nail 1 is driven into the wood M as a cross-sectional view. The vertical lines shown in the wood M represent the fibers of the wood.
When a nail 70 having a flat tip 73 is driven into the wood M, the tip 73 cuts off the fibers of the wood and invades while crushing them. At this time, most of the portions of the wood M in which the fibers are cut off are crushed and compressed in the traveling direction of the shaft portion 2 (compressed portion 75).

Since the compressed portion 75 is mainly compressed in the longitudinal direction of the shaft portion 72, it is unlikely to swell in the direction orthogonal to the longitudinal direction of the shaft portion 2. Therefore, the force that tears the fibers of the wood M is small, and the wood M is less likely to be cracked by driving the nail 70.
This action is common to each of the above-described examples.

Each of the above-described examples may be appropriately combined within a range that does not deviate from the gist of the present invention and the scope of claims.

The present invention can be used for nails for fastening wood and nails for nail guns.

1 Nail 2 Shaft 3 Tip 4 Rear end

Claims (7)

The tip of the shaft portion that does not provide an extreme shape change on the surface of the central portion is formed in a non-spiers shape, the opposite end of the shaft portion is formed in the same shape as the tip portion, and the shaft is formed by striking the tip or the opposite end. A nail characterized by being formed so that the entire part can be driven. The nail according to claim 1, wherein a flat surface orthogonal to the longitudinal direction of the shaft portion is formed at the tip end of the shaft portion. The nail according to claim 1, wherein the tip of the shaft portion is formed in a concave shape recessed in a spherical shape or a conical shape. The nail according to claim 1, wherein a groove orthogonal to the longitudinal direction of the shaft portion is formed on the entire tip surface of the shaft portion. The nail according to claim 1, wherein a single groove orthogonal to the longitudinal direction of the shaft portion is formed on the tip surface of the shaft portion. 1. 4. The nail according to any one of claims 5. Claims 1 to 6 are characterized in that a rough surface portion composed of a spiral or a plurality of steps of annular ridges swirled a plurality of times is provided on the surface of a shaft portion extending from the vicinity of the tip and the opposite end to the other end. The nail described in any one of the items.

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