JP2005003188A - Wood screw for fastening wooden components - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood screw for fastening wooden components which can fasten two wooden components so as to bring them into tight contact with each other. <P>SOLUTION: The wood screw for fastening wooden components has a sharp tip end 5, a first threaded portion 6, a cylindrical threadless portion 7, a second threaded portion 8, and a head 3 in that order. The second threaded portion 8 is composed of an introductory portion 9 where the thread is formed so as to have a zero lead angle, and a main portion 10 which is continued from the introductory portion 9 and is provided with a thread 18 formed up to the neck portion under the head 3 so as to have the same lead as the lead of the first threaded portion 6. By this configuration, both wooden components are firmly brought into contact with each other, and clearance between both wooden components does not occur for a long time. Therefore, occurrence of a creak of a floor, a warp of a wall, etc. can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は建築物に使用される例えば床下を構成する大引と根太のように木材と木材を締結する木ネジに関する。
【０００２】
【従来の技術】
例えば木造建築物の床下を構成する大引と根太の締結、または間柱と胴縁の締結をするのに一般的な釘から、いろいろな外的要因による振動により釘が緩んで抜け、床の軋みや壁面の撓み等が生じるため、最近では釘に変わり公知の木ネジがよく使われていたが、公知の木ネジでは２つの木材を締結する際、両方の木材にネジが係るとネジの回転によりそれぞれの木材が同じように木ネジの頭方向に引き寄せられるため、被固定側の木材と固定側の木材が密着せず、両者の間に隙間が生じ、床の軋みや壁面の撓み等が発生るといった問題から、特開２００１−９０７２０号や特開平６−４２５１５号に開示された、木ネジの先端側と頭部側にピッチの異なるネジ山を設けることで、双方の木材のネジ頭部側への引寄せ速度を違えることで双方の木材を引寄せられるよう工夫されたものが提案された。
【０００３】
【特許文献１】
特開２００１−９０７２０号公報
【特許文献２】
特開平６−４２５１５号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、これらのネジは、被固定側または固定側のそれぞれの木材に螺合する木ネジのネジ山ピッチが違う為、比較的柔らかい木材に使用した場合、一方の木材には、ピッチの異なる２種類のネジ山が螺入し、木材のネジ山との接触部分が破壊されるので、木材の経年変化によりネジの締結力が失われ、結果として十分な引き寄せ効果が得られなかったり、また比較的硬い木材に使用した場合、先端側と頭部側のネジピッチが異なるために先端側と頭部側とで螺入速度が異なり、結果、木ネジが捻じ込み途中で螺進不可能となり、最後まで捻じ込めないことがあった。
【０００５】
【課題を解決するための手段】
上記のような課題を解決するため、請求項１の発明は、木材と木材を締結するために使用される木ネジであって、先鋭な先端部、先鋭な先端部から始まる第１ネジ部、所定の長さの円柱状の無ネジ部、続いて第２ネジ部、木ネジを回す工具と嵌合する機構を有する頭部の順に設け、第２ネジ部は、前記円柱状の無ネジ部側の端部ネジ山をリード角０度にて成形した導入部、導入部から連設し、第１ネジ部のネジピッチと同じピッチで成形されたネジ山を前記頭部の首下まで設けた主部とからなる構成を採用したものである。
【０００６】
請求項２の発明は、請求項１に記載の木材締結用木ネジにおいて、前記第２ネジ部の導入部のネジ山が、前記円柱状の無ネジ部の前記頭部側の端部表面から徐々に高くなり、その最大外径が前記第２ネジ部の主部のネジ山の最大外径より小さく、前記第２ネジ部の主部のネジ山に連設した構成を採用したものである。
【０００７】
請求項３の発明は、請求項１および請求項２に記載の木材締結用木ネジにおいて、前記第２ネジ部の主部のネジ山が、主部の途中から前記第２ネジ部の導入部に向って徐々に縮径し、前記第２ネジ部の導入部への移行部分で段差が無いよう成形した構成を採用したものである。
【０００８】
【発明の実施の形態】
以下、この発明の実施の形態を図示例と共に説明する。
【０００９】
図１に示すように、本発明である木ネジ１には軸部２の一端に、木ネジ１を回す工具３１と嵌合する機構４を有する頭部３、他端に先鋭な先端部５、先鋭な先端部５から始まる第１ネジ部６のネジ山１６を軸部２の所定位置まで設け、続いて被固定側の木材の厚みと同じ長さ以上の全長に構成され、断面の外径がネジ山１６の谷径より大きく、呼び径より小さく成形された円柱状の無ネジ部７を、続いて前記頭部３の首下まで、第２ネジ部８を設けてある。
【００１０】
また、第２ネジ部８は、円柱状の無ネジ部７の端から始まる、導入部９と、第１ネジ部６のネジ山１６と同じリード角でネジ山１８を成形した主部１０とからなり、主部１０はその途中から導入部への移行部分に向って徐々に縮径し、導入部９のネジ山１７は、無ネジ部７の頭部３側の端１１の表面からリード角０度にてネジ山１７が主部１０のネジ山１８に向って徐々に拡径し、ネジ山１８からとネジ山１７への移行部分で、双方のネジ山の外径が同じ大きさとなって段差無く、連設するように成形してある。
【００１１】
次に、本発明である木ネジ１による木造建築物の床下を構成する大引２２と根太２１の締結方法を、図３を用いて説明する。
【００１２】
予め図示しない床束に接合された大引２２上に直交するように設置された根太２１の上から本発明である木ネジ１の頭部３に設けた機構４に工具３１を嵌合させ、先鋭な先端部５から捻じ込んでいく。
【００１３】
先鋭な先端部５が根太２１を貫通し、大引２２に捻じ込まれていく。そして第１ネジ部６のネジ山１６が大引２２に完全に捻じ込まれると、円柱状の無ネジ部７に続いて、第２ネジ部８のネジ山１７が根太２１に回転しながら食い込んでいく。
【００１４】
この時、ネジ山１７のリード角は０度にて成形されているので、ネジ山１７が根太２１に回転しながら食い込んでいく時、ネジ山１７は根太２１を大引２２に強く押し付ける。
【００１５】
そして、次にネジ山１７に連設した、第１ネジ山１６と同じピッチで成形されたネジ山１８が根太２１に回転しながら食い込んでいくが、ネジ山１７によって根太２１は大引２２に強く押し付けられているため、根太２１と大引２２が密着した状態で第２のネジ山１８は根太２１にねじ込まれていく。
【００１６】
その際、円柱状の無ネジ部７が貫通した、根太２１のネジ穴２３は木材の復元力により多少収縮するが、導入部９のネジ山１７は、無ネジ部７の頭部３側の端１１の表面からリード角０度にてネジ山１７が主部１０のネジ山１８に向って徐々に拡径し、ネジ山１８は主部１０の途中部から導入部９への移行部分に向って徐々に縮径し、双方のネジ山外径が同じ大きさとなったところで段差なく連設しているので、根太２１の材質が硬質であってもネジ山１７とネジ山１８は無理なくネジ穴２３に捻じ込まれていく。
【００１７】
最後に、木ネジ１の頭部３が根太２１にほぼ面一になるまでねじ込まれ、本発明品である木ネジ１を使った大引２２への根太２１の締結は、双方が引き寄せられ密着した状態で完了する。
【００１８】
なお、第１のネジ山１６が大引２２に、第２のネジ山１８が根太２１にねじ込まれている時、双方のネジ山のピッチは同じであるため、根太２１と大引２２のネジ山との接触部分が破壊されことなく、引き寄せられている。
【００１９】
【発明の効果】
以上のように、この発明によると、先鋭な先端部、先鋭な先端部から始まる第１ネジ部、所定長さの円柱状の無ネジ部、続いて第２ネジ部、木ネジを回す工具と嵌合する機構を有する頭部の順に設け、第２ネジ部は、円柱状の無ネジ部側の端部ネジ山をリード角０度にて成形した導入部、導入部から連設し、第１ネジ部のネジピッチと同じピッチで成形されたネジ山を前記頭部の首下まで設けた主部とからなり、さらに第２ネジ部の始まり部のネジ山が、円柱状の無ネジ部の表面から徐々に拡径し、第２ネジ部の主部のネジ山が主部の途中部からから導入部への移行部分に向って徐々に縮径し、双方のネジ山が段差無く連設していることを特徴とする木材締結用木ねじを使って木材と木材を締結すれば、双方の木材がしっかりと引寄せられ、いつまでも双方の木材の間に隙間が生じることがないので、床の軋みや壁面の撓み等の発生を防ぐことができる。
【図面の簡単な説明】
【図１】本発明に係る木材締結用木ねじの一例を示す正面図と左側面図である。
【図２】本発明に係る木材締結用木ねじの第２ネジ部の導入部の一例を示す部分拡大図である。
【図３】本発明に係る木材締結用木ねじのＡ−Ａ断面拡大図である。
【図４】本発明に係る木材締結用木ねじを使用した根太と大引の締結工程を示す工程図である。
【図５】木材締結用木ねじの従来例である。
【符号の説明】
１． 木ネジ
２． 軸部
３． 頭部
４． 機構
５． 先端
６． ネジ部
７． 無ネジ部
８． ネジ部
９． 導入部
１０． 主部
１１． 端
１６． ネジ山
１７． ネジ山
１８． ネジ山
２１． 根太
２２． 大引
２３． ネジ穴
３１． 工具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood screw used for a building, for example, a wood screw that fastens wood and wood such as a large drawing and joists constituting the underfloor.
[0002]
[Prior art]
For example, nails that are loosely pulled out by vibrations caused by various external factors from nails that are used to fasten daisaki and joists that make up the floor of wooden buildings, or between studs and torso edges, sag the floor. Recently, known wood screws are often used instead of nails because of the bending of the wall surface, etc., but when two woods are fastened with known wood screws, the screws rotate when both woods are screwed. Since each piece of wood is pulled in the same direction toward the head of the wood screw, the wood on the fixed side and the wood on the fixed side are not in close contact with each other, creating a gap between them, causing stagnation of the floor, bending of the wall surface, etc. Due to the problem of occurrence, screw heads of both woods are provided by providing screw threads having different pitches on the tip side and the head side of the wood screw disclosed in Japanese Patent Laid-Open No. 2001-90720 and Japanese Patent Laid-Open No. 6-42515. Both sides by changing the pulling speed to the club side Those that have been devised to be attracted the wood has been proposed.
[0003]
[Patent Document 1]
JP 2001-90720 A [Patent Document 2]
Japanese Patent Application Laid-Open No. 6-42515
[Problems to be solved by the invention]
However, since these screws have different thread pitches of wood screws that are screwed to the fixed side or fixed side wood, when used on relatively soft wood, one wood has a different pitch. Since various types of screw threads are screwed in and the contact area with the screw threads of wood is destroyed, the fastening force of the screws is lost due to aging of the wood, and as a result, sufficient pulling effect cannot be obtained or compared When using hard wood, the screw pitch on the tip side and the head side is different because the screw pitch on the tip side is different from that on the head side. As a result, the wood screw cannot be screwed in the middle of screwing. I couldn't screw it up.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 is a wood screw used for fastening wood and wood, a sharp tip portion, a first screw portion starting from the sharp tip portion, A cylindrical unthreaded portion of a predetermined length, followed by a second screw portion, and a head having a mechanism that fits with a tool for turning a wood screw are provided in this order, and the second screw portion is the cylindrical unthreaded portion. The end thread on the side is connected from the introduction part formed at a lead angle of 0 degrees and the introduction part, and the thread formed at the same pitch as the screw pitch of the first screw part is provided up to the neck of the head. The structure which consists of a main part is adopted.
[0006]
According to a second aspect of the present invention, in the wood fastening wood screw according to the first aspect, the thread of the introduction portion of the second screw portion is from the end surface on the head side of the cylindrical screwless portion. The configuration is such that it gradually increases, the maximum outer diameter is smaller than the maximum outer diameter of the main thread of the second screw part, and is connected to the main thread of the second screw part. .
[0007]
According to a third aspect of the present invention, in the wood fastening wood screw according to the first and second aspects, the thread of the main portion of the second screw portion is introduced from the middle of the main portion to the introduction portion of the second screw portion. In this configuration, the diameter is gradually reduced toward the inlet, and the second screw portion is formed so that there is no step at the transition portion to the introduction portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
As shown in FIG. 1, the wood screw 1 according to the present invention has a head 3 having a mechanism 4 fitted to a tool 31 for turning the wood screw 1 at one end of a shaft portion 2, and a sharp tip 5 at the other end. The thread 16 of the first screw portion 6 starting from the sharp tip portion 5 is provided up to a predetermined position of the shaft portion 2, and is subsequently configured to have a total length that is equal to or greater than the thickness of the wood on the fixed side. A cylindrical unthreaded portion 7 having a diameter larger than the root diameter of the thread 16 and smaller than the nominal diameter is provided, and then a second threaded portion 8 is provided up to the neck of the head 3.
[0010]
The second screw portion 8 includes an introduction portion 9 starting from an end of the cylindrical screwless portion 7, and a main portion 10 formed with a screw thread 18 at the same lead angle as the screw thread 16 of the first screw portion 6. The main portion 10 gradually decreases in diameter from the middle toward the introduction portion, and the thread 17 of the introduction portion 9 leads from the surface of the end 11 on the head 3 side of the screwless portion 7. The thread 17 gradually increases in diameter toward the thread 18 of the main portion 10 at an angle of 0 degrees, and the outer diameter of both threads is the same size at the transition from the thread 18 to the thread 17. It has been molded so that there is no difference in level.
[0011]
Next, the fastening method of the big drawing 22 and the joist 21 which comprises the under floor of the wooden building by the wood screw 1 which is this invention is demonstrated using FIG.
[0012]
A tool 31 is fitted to the mechanism 4 provided on the head 3 of the wood screw 1 according to the present invention from the joist 21 installed so as to be orthogonal to the large pull 22 joined in advance to a floor bundle not shown. Screw in from the sharp tip 5.
[0013]
The sharp tip 5 penetrates the joist 21 and is screwed into the large pull 22. Then, when the thread 16 of the first screw portion 6 is completely screwed into the large pull 22, the thread 17 of the second screw portion 8 bites into the joist 21 after the cylindrical unthreaded portion 7. Go.
[0014]
At this time, since the lead angle of the screw thread 17 is formed at 0 degree, when the screw thread 17 bites into the joist 21 while rotating, the screw thread 17 strongly presses the joist 21 against the large pull 22.
[0015]
Then, the screw thread 18 formed at the same pitch as the first screw thread 16 continuously connected to the screw thread 17 bites into the joist 21 while the joist 21 is turned into the large pull 22 by the screw thread 17. The second screw thread 18 is screwed into the joist 21 in a state where the joist 21 and the large pull 22 are in close contact with each other.
[0016]
At that time, the screw hole 23 of the joist 21 through which the cylindrical screwless portion 7 has penetrated is somewhat contracted by the restoring force of the wood, but the screw thread 17 of the introduction portion 9 is on the head 3 side of the screwless portion 7. The thread 17 is gradually expanded from the surface of the end 11 toward the thread 18 of the main portion 10 at a lead angle of 0 degree, and the thread 18 is in a transition portion from the middle portion of the main portion 10 to the introduction portion 9. Since the diameter is gradually reduced and both the outer diameters of the threads are the same size, the threads 17 and 18 are easily provided even if the joist 21 is made of a hard material. It is screwed into the screw hole 23.
[0017]
Finally, the head 3 of the wood screw 1 is screwed into the joist 21 until it is almost flush with the joist 21 using the wood screw 1 of the present invention. Completed with
[0018]
When the first screw thread 16 is screwed into the large pull 22 and the second screw thread 18 is screwed into the joist 21, the pitch of both screw threads is the same. The contact with the mountain is drawn without being destroyed.
[0019]
【The invention's effect】
As described above, according to the present invention, the sharp tip portion, the first screw portion starting from the sharp tip portion, the cylindrical screw-free portion having a predetermined length, the second screw portion, and the tool for turning the wood screw, Provided in the order of the head having a mechanism to be fitted, the second threaded portion is continuously provided from an introduction portion formed by forming an end screw thread on the cylindrical non-threaded portion side at a lead angle of 0 degrees, A thread formed at the same pitch as the thread pitch of one thread part is composed of a main part provided up to the neck of the head, and the thread of the start part of the second thread part is a cylindrical unthreaded part. The diameter of the main part of the second screw part gradually increases from the surface and gradually decreases from the middle part of the main part to the transition part to the introduction part. If you use wood screws for wood fastening that are characterized by fastening wood and wood, both wood will be firmly drawn, Because does not occur gap between both wood even One, it is possible to prevent the occurrence of deflection or the like of the floor creaking and walls.
[Brief description of the drawings]
FIG. 1 is a front view and a left side view showing an example of a wood fastening wood screw according to the present invention.
FIG. 2 is a partially enlarged view showing an example of an introduction portion of a second screw portion of a wood fastening wood screw according to the present invention.
FIG. 3 is an AA cross-sectional enlarged view of a wood fastening wood screw according to the present invention.
FIG. 4 is a process diagram illustrating a process of fastening a joist and a large pull using a wood fastening wood screw according to the present invention.
FIG. 5 is a conventional example of wood screws for wood fastening.
[Explanation of symbols]
1. Wood screw 2. 2. Shaft part Head 4. Mechanism 5 Tip 6. 6. Screw part Screwless part8. Screw part 9. Introduction unit 10. Main part 11. End 16. Thread 17. Thread 18. Thread 21. Jota22. Ohiki 23. Screw hole 31. tool

Claims (3)

木材と木材を締結するために使用される木ネジであって、先鋭な先端部、先鋭な先端部から始まる第１ネジ部、所定の長さの円柱状の無ネジ部、続いて第２ネジ部、木ネジを回す工具と嵌合する機構を有する頭部の順に設け、第２ネジ部は、前記円柱状の無ネジ部側の端部ネジ山をリード角０度にて成形した導入部、導入部から連設し、第１ネジ部のネジピッチと同じピッチで成形されたネジ山を前記頭部の首下まで設けた主部とからなることを特徴とする木材締結用木ネジ。A wood screw used for fastening wood to a wood, having a sharp tip portion, a first screw portion starting from the sharp tip portion, a cylindrical screwless portion of a predetermined length, and then a second screw The second threaded portion is formed with an end thread on the side of the cylindrical threadless portion formed at a lead angle of 0 degrees. A wood screw for wood fastening comprising: a main portion provided continuously from the introduction portion and provided with a thread formed at the same pitch as the screw pitch of the first screw portion up to the neck of the head. 請求項１に記載の木材締結用木ネジにおいて、前記第２ネジ部の導入部のネジ山が、前記円柱状の無ネジ部の前記頭部側の端部表面から徐々に拡径し、その最大外径が前記第２ネジ部の主部のネジ山の最大外径より小さく、前記第２ネジ部の主部のネジ山に連設したことを特徴とする木材締結用木ネジ。The wood screw for wood fastening according to claim 1, wherein the thread of the introduction portion of the second screw portion gradually expands from the end surface on the head side of the cylindrical screwless portion, A wood screw for wood fastening, characterized in that the maximum outer diameter is smaller than the maximum outer diameter of the main thread of the second screw part and is continuous with the main thread of the second screw part. 請求項１および請求項２に記載の木材締結用木ネジにおいて、前記第２ネジ部の主部のネジ山が、主部の途中から前記第２ネジ部の導入部に向って徐々に縮径し、前記第２ネジ部の導入部のネジ山への移行部分で、段差が無いよう成形したことを特徴とする木材締結用木ネジ。3. The wood fastening wood screw according to claim 1, wherein the thread of the main portion of the second screw portion is gradually reduced in diameter from the middle of the main portion toward the introduction portion of the second screw portion. And the wood screw for wood fastening characterized by shape | molding so that there may be no level | step difference in the transition part to the screw thread of the introduction part of the said 2nd screw part.

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