JP2003184842A - Threaded nail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a threaded nail capable of ensuring stable fitting strength without denting a surface of a hollow steel pipe body when the pipe body made of a thin steel sheet or the like is attached by using a nail to a plane member made of wood, or of laminated wood or the like. <P>SOLUTION: The threaded nail 1 comprises a shaft body 2, a head 3 provided in a base end of the shaft body 2 and a pointed top 4 provided in a point thereof. The shaft body 2 comprises a first threaded portion 5 formed at the point side and a second threaded portion 6 formed with a larger screw thread pitch than that of the first threaded portion 1 in the base end, so that difference of lead between the first threaded potion 5 and the second threaded potion 6 causes a swell to yield on a surface of the pipe body that is first nailed and further the nail 1 is turned to tighten until the swell disappears. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw nail used when a hollow steel pipe or the like is nailed to a face material made of wood or wood plywood.

[0002]

2. Description of the Related Art First, a conventional screw nail 100 will be described with reference to the drawings. As shown in FIG. 8, the screw nail 100 is provided with a shaft 101 having a substantially columnar shape having the same outer diameter (valley diameter) and a base end of the shaft 101, and
A head 102 that can be engaged with a screwdriver or a rotary tightening tool (not shown) such as a hexagonal wrench, and the shaft 10.
1. The shaft body 101 comprises a threaded portion 104 having a thread on the tip side and a threadless portion having no thread on the base side. And 105.

A face material (hereinafter, simply referred to as "face material") 10 made of wood or wood plywood using the screw nail 100.
In addition, a tubular body made of a thin steel plate (hereinafter simply referred to as "stud"
Say. ) When nailing 20, the stud 20 is closely attached onto the face material 10, and the screw nail 100 is tightened from above by using a rotary tightening tool (not shown) such as a screwdriver. Go on.

At this time, as shown in FIG.
After the pointed portion 103 of 0 has passed through the stud 20 and has reached the surface 11 of the face material 10, and continues to enter the inside of the face material 10, that is, when starting drilling a prepared hole in the face material 10. ,
The thread at the tip of the sharpened portion 103 of the screw nail 100 is the face material 10.
The stud 20 is lifted from the face material 10 and a gap is created between the face material 10 and the stud 20.

However, in the screw nail 100, since all the threads are formed at the same pitch, the screw nail 100 starts to enter the inside of the face material 10 and the head portion 10 of the screw nail 100.
It is not possible to eliminate the gap that has occurred until 2 reaches the surface (upper side in the figure) 21 of the stud 20. Therefore, the screw nail 100 is tightened until the head 102 comes into contact with the stud 20, and then the screw nail 100 is tightened once more to eliminate this gap.

[0006]

When re-tightening, the conventional screw nail 100 has the following problems. First, how much screw nail 100 should be tightened
The clearance between the stud 20 and the stud 20 is eliminated, and the screw nail 100
There was a problem that it was difficult to judge whether the tightening was completed.

Further, since the stud 20 is a tubular body made of a thin steel plate, the more the screw nail 100 is tightened in order to eliminate the gap between the face material 10 and the stud 20, the more the screw is tightened. The head 102 of the nail 100 is the stud 2.
Since the surface 21 of 0 is pushed, there is a problem that the surface 21 of the stud 20 may be dented and crushed as shown in FIG. 10 depending on the tightening condition.

Similarly, the screw groove 100 formed in the face material 10 is broken by overtightening the screw nail 100 in an attempt to eliminate the gap generated between the face material 10 and the stud 20. Screw stupid phenomenon occurs, and screw nail 10
There are times when stopping with 0 will not work,
There is a problem that it is difficult to secure stable mounting strength.

The present invention has been made in view of the above problems, and when a pipe made of thin steel plate is nailed to a face material made of wood or wood plywood, the surface of the pipe is An object of the present invention is to provide a screw nail that secures stable mounting strength without being crushed.

[0010]

The screw nail according to claim 1 of the present invention, which has been made to achieve the above object, has a shaft body, a head provided at the base end of the shaft body, and a tip end. And a tapered threaded portion provided on the base, and the shaft body has a first threaded portion formed with a thread having a length substantially equal to the thickness of a member to be nailed to the tip side, and a first threaded portion on the base end side. It is characterized in that it is configured by a second screw portion in which a screw thread is formed at a pitch larger than the pitch of the screw thread of the screw portion.

According to a second aspect of the present invention, there is provided a threaded nail according to the first aspect, wherein a threadless portion having no thread is formed on the base end side of the first screw portion. It is a feature.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a screw nail 1 according to the present embodiment has a shaft body 2 having a substantially cylindrical shape with the same outer diameter (valley diameter), and a head provided at the base end of the shaft body 2. A face member (hereinafter referred to simply as "face member") 10 made of wood or wood plywood, which is composed of a portion 3 and a tapered sharpened portion 4 provided at the tip, and a tubular body made of a thin steel plate ( Hereinafter, this is a screw nail used when nailing 20) (see FIG. 6). The thickness of the thin plate forming the stud 20 is not particularly limited as long as it is sufficiently thin as compared with the length of the second screw portion 5 of the screw nail 1 described later. The details will be described below.

As shown in FIG. 1, the shaft body 2 has a first screw portion 5 formed on the front end side and a second screw portion 5 formed on the base end side.
It is composed of a screw portion 6. The length of the stud 20 is set to be sufficiently longer than the thickness of the stud 20 nailed to the face material 10 (see FIG. 3).

The length of the first screw portion 5 is the same as that of the first screw portion 5.
The boundary between the second threaded portion 6 and the second threaded portion 6 is located closer to the base end side than the surface 21 of the stud 20 (upper side in the drawing; hereinafter referred to as “upper surface”) 21 when the sharpened portion 4 is screwed into the face material 10. As described above, the thickness is set to be equal to or longer than the thickness of the stud 20 to be nailed (upper side in FIG. 3). Further, the thread diameter and pitch of the thread may be appropriately set according to the thickness and hardness of the stud to be nailed,
There is no particular limitation.

The shape of the first threaded portion 5 is not limited to this, and as shown in FIG. 2, a threadless portion 7 having no thread may be provided on the base end side thereof. At this time, the length of the threadless portion 7 is not particularly limited, but the threadless portion 7
It is set so that the length of the portion where the thread is formed by subtracting the length of is equal to or longer than the length of the second screw portion 6.

The second screw portion 6 is, as shown in FIG.
The shaft 2 is formed up to the base end, and the pitch of threads is set to be larger than that of the first screw portion 5, that is, the lead of the second screw portion 6 is longer than the lead of the first screw portion 5. Also,
The thread diameter of the screw thread is set to be slightly larger than that of the first screw portion 5.

The head 3 has a substantially dish shape. Further, although not shown, a groove or the like having a one-letter shape or a cross-letter shape is formed on the upper end surface so that it can be engaged with a rotary engaging portion at the tip of a rotary tightening tool such as a driver.

The pointed portion 4 is formed in a substantially conical shape with the tip of the tip as the apex, and the maximum diameter thereof is set to be approximately the same as the outer diameter (valley diameter) of the shaft body 2. Further, the threads are formed at the same pitch as the first screw portion 5.

Next, a procedure for using the screw nail 1 to attach the stud 20 to the face material 10 as shown in FIGS. 3 to 6 will be described. First, as shown in FIG. 3, the stud 20 is joined to the surface 11 of the face material 10 so as to be closely adhered thereto, and the screw nail 1 is tightened from above, and the sharpened portion 4 at the tip of the screw nail 1 is joined. However, a burr 22 is formed by making a pilot hole in the upper surface 21 of the stud 20, and the thread of the first screw portion 5 is engraved with a thread groove in the burr 22.

When the screw nail 1 is continuously tightened, the sharpened portion 4 reaches the side surface 10 of the face member 10 of the stud 20 (lower side in the drawing; hereinafter referred to as "lower surface") 23, and the upper surface 2
As in the case of 1, the burr 24 is formed by forming the pilot hole, and the tip of the burr 24 reaches the surface 11 of the face material 10.

Here, from the time when the tip of the sharpened portion 4 reaches the surface 11 of the face material 10 to the time when the sharpened portion 4 is smoothly screwed into the face material 10, the screw nail 1 causes a slight idling phenomenon. As it is raised, the shaft body 2 is burr 22 of the stud 20,
By advancing along the thread groove formed in 24, a slight gap is created between the face material 10 and the stud 20. However, in the present embodiment, the face material 10 is made of wood or wood plywood, and the stud 20 is made of steel thin plate.
That is, since the face material 10 is made of a material softer than the stud 20, when the lower surface 23 of the stud 20 is reached, by screwing the screw nail 1 with a strong force at once, the surface 11 of the face material 10 and the stud 20 are A gap generated between the lower surface 23 and the lower surface 23 can be suppressed.

Further, the length of the first screw portion 5 is set to the stud 20.
Is set to be slightly longer than the thickness of the stud 20, so that when the tip of the sharpened portion 4 reaches the lower surface 23 of the stud 20, a thread near the upper end of the first screw portion 5 is formed on the burr 22 of the upper surface 21 of the stud 20. Since the screw nail 1 is screwed into the formed screw groove, even if the screw nail 1 is screwed in at a stretch with a strong force, the screw nail 1 does not fall down.

Further, as shown in FIG. 2, when the threadless portion 7 is formed on the base end side of the first screw portion 5, when the tip of the sharpened portion 4 reaches the lower surface 23 of the stud 20, The non-threaded portion 7 is located on the burr 22 on the upper surface 21 of the stud 20, and the screw thread of the first screw portion 5 is not screwed into the thread groove formed on the burr 22. Can be screwed in.

Then, as shown in FIG. 4, when the sharpened portion 4 is completely screwed into the face material 10, the threads of the tip of the second screw portion 6 come into contact with the upper surface 21 of the stud 20. From this point, when the screw nail 1 is further tightened, in the face material 10, the screw thread on the tip side of the first screw portion 5 is engraved with a thread groove in the prepared hole formed by the sharpened portion 4, The front end side of the first screw portion 5 is fixed to the face material 10 by screwing the thread on the base end side from the groove into the groove. Also in the stud 29, a screw thread on the tip side of the second screw portion 6 is engraved in the burr 22 on the upper surface 21, and a screw thread on the base end side is screwed into the screw groove, A thread groove on the tip side of the first screw portion 5 is engraved in the burr 24 of the lower surface 23, and a screw thread on the base end side of the thread groove is screwed into the thread groove, whereby the screw thread of the first screw portion 55 is formed. The base end side is provided with the burr 24 of the lower surface 23 and the second screw portion 6
Are fixed to the burrs 22 on the upper surface 21, respectively. In this way, the stud 20 is fixed to the face material 10.

Here, since the thread diameter of the thread of the second screw portion 6 is made slightly larger than that of the first screw portion 5 as described above, the second screw portion 6 has the upper surface 21 of the stud 20. The screw nail 1 enters as the lower hole is widened, so that the stud 20 and the second screw portion 6 can be securely screwed together.

When the thread of the second screw portion 6 starts to enter while engraving the thread groove in the burr 22 formed in the pilot hole of the upper surface 21 of the stud 20, the pitch of the thread of the first screw portion 5 is Since the thread pitch of the second screw part 6 is larger, that is, the lead of the thread of the second screw part 6 is larger than the lead of the thread of the first screw part 5, the screw nail 1 is rotated once. In such a case, the distance traveled by the first screw portion 5 becomes shorter than that of the second screw portion 6. That is, the face material 10 and the stud 20
The distance that the first screw portion 5 of the screw nail 1 entering the burr 24 of the lower surface 23 of the
It becomes relatively shorter than the distance traveled by the second screw portion 6 of the screw nail 1 that has entered 2. As a result, as shown in FIG. 5, the screw nail 1 is not tightened smoothly, and the upper surface 21 of the stud 20 is bulged.

Here, when the screw nail 1 is tightened at once from this state, as shown in FIG. 6, the screw nail 1 enters and the bulge of the upper surface 21 of the stud 20 decreases. Further, by tightening the screw nail 1 until the bulge is eliminated, the stud 20 is fixed to the face material 10 without the upper surface 21 of the stud 20 being dented and crushed.

At this time, since the second screw portion 6 is formed up to the base end of the shaft body 2, that is, directly below the head portion 3, the screw nail 1 until the bulge of the upper surface 21 of the stud 20 is eliminated.
By tightening the screw, the head 2 of the screw nail 1 and the stud 2
The upper surface 21 of 0 can be attached in close contact.

Further, in the present embodiment, the stud 20 is nailed to the face material 10. However, as shown in FIG. 7, the main screw nail 1 is manufactured by the same procedure as in the present embodiment.
For example, it can be used when the stud 20 is nailed to the stud 20.

[0030]

As described above, according to the first aspect of the present invention.
According to the screw nail described in (1), when a pipe made of a thin steel plate or the like is nailed to a face material such as wood or wood plywood, the thread pitch of the second screw part of the screw nail is the first screw. The thread pitch of the second threaded portion is larger than the pitch of the threaded thread of the second threaded portion, that is, the lead of the threaded thread of the second threaded portion is larger than the lead of the threaded thread of the first threaded portion. The tightening of the screw nails will not be carried out smoothly due to the difference in, and it is sufficient to tighten the screw nails until the bulge of the tube body caused by this is eliminated, so it is possible to judge whether the tightening of the screw nails is completed. It has the advantage of being easy.

As a result, it is possible to prevent overtightening of the screw nail, and there is an advantage that the surface of the pipe body is not crushed by the overtightening of the screw nail.

As described above, since the screw nail is not screwed in too much, there is an advantage that a so-called screw back phenomenon does not occur and a stable mounting strength can be secured.

According to the screw nail of the second aspect, when the tip of the sharpened portion reaches the face material, the screwless portion is located in the lower hole of the surface of the pipe body. Since the screw thread of the first screw portion does not screw into the screw groove formed in the burr, there is an advantage that the screw nail can be screwed in with a stronger force.

[Brief description of drawings]

FIG. 1 is an overall front view showing a screw nail according to the present invention.

FIG. 2 is an overall front view showing a screw nail according to another embodiment.

FIG. 3 is a cross-sectional explanatory view showing an example of an embodiment of the present invention.

FIG. 4 is a cross-sectional explanatory view showing an example of an embodiment of the present invention.

FIG. 5 is a cross-sectional explanatory diagram showing an example of an embodiment of the present invention.

FIG. 6 is a cross-sectional explanatory diagram showing an example of an embodiment of the present invention.

FIG. 7 is a cross-sectional explanatory view showing an example of another embodiment of the present invention.

FIG. 8 is a cross-sectional explanatory view showing an example of a conventional screw nail.

FIG. 9 is a cross-sectional explanatory view showing an example of a conventional embodiment.

FIG. 10 is an explanatory cross-sectional view showing an example of a conventional embodiment.

[Explanation of symbols]

1 screw nail Biaxial body 3 heads 4 pointed part 5 First screw part 6 Second screw part 10 face materials 20 studs

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2E125 AA42 AA66 AB16 AE16 AG20                       BB08 BD01 BE01 BF01 CA02                       CA14 CA77 EA01

Claims (2)

[Claims] 1. A thickness of a member comprising a shaft body, a head provided at a base end of the shaft body, and a tapered sharpened portion provided at a tip end of the shaft body, the member being nailed to the tip side. And a second threaded portion having a thread formed at a pitch larger than the pitch of the threaded portion of the first threaded portion on the base end side. A screw nail characterized by that. 2. The screw nail according to claim 1, wherein a threadless portion having no thread is formed on the base end side of the first screw portion.