JP4191410B2 - Self-tapping screw and fastening method - Google Patents

Self-tapping screw and fastening method Download PDF

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JP4191410B2
JP4191410B2 JP2002004753A JP2002004753A JP4191410B2 JP 4191410 B2 JP4191410 B2 JP 4191410B2 JP 2002004753 A JP2002004753 A JP 2002004753A JP 2002004753 A JP2002004753 A JP 2002004753A JP 4191410 B2 JP4191410 B2 JP 4191410B2
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main body
diameter
hole
male screw
pilot hole
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JP2003206918A (en
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諭 青山
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尾張精機株式会社
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Description

【０００１】
【発明の属する技術分野】
本発明は先端部に半球状の部分を有したセルフタッピングねじに関する。
【０００２】
【発明が解決しようとする課題】
セルフタッピングねじは、図７（ａ）に示すように、軸部の先端が尖った形状のもの（尖り先）、或いは同図（ｂ）に示すように、軸部の先端が平たいもの（平先）が一般的である。
【０００３】
しかしながら、いずれの形状のセルフタッピングねじでも、締結対象物に明けられた下穴に挿入する際に、先端を締結対象物にぶつけたりすると、その対象物を傷付けたりする恐れがある。特に、締結対象物に塗装が施されていたりすると、その塗装膜を傷付けて錆の発生の原因になったりするという問題を生ずる。また、２枚の板材を締結する場合など、その２枚の板材に明けられた穴がずれていると、セルフタッピングねじを穴に通すことが困難になったりする。
【０００４】
本発明は上記の事情に鑑みてなされたもので、その目的は、先端部を締結対象物にぶつけたりしても傷付ける恐れがなく、また、重ねられた締結対象物の下穴がずれていたとしても、その穴に容易に通すことができるセルフタッピングねじを提供することにある。
【０００５】
【課題を解決するための手段】
本発明のセルフタッピングねじは、上記の目的を達成するために、セルフタッピング作用を有する雄ねじが形成された軸部の一端部に頭部を形成し、前記軸部は前記雄ねじの両端のうち前記頭部側の端から前記頭部までの間に前記雄ねじが形成されていない首下部分を有し、前記軸部の先端部に当該軸部の最小谷径と同径またはやや小なる径のストレート部を形成し、このストレート部の先端部に当該ストレート部の径と同径の半球状部を形成して構成され、前記雄ねじの外径より若干大きい径の通し穴が形成された締結対象物を、前記最小谷径より若干大きい径の下穴が形成された主体に締結するセルフタッピングねじであって、略Ｕ字状に形成され、その対向２辺のうち一方の辺に前記最小谷径より若干大きい径の下穴が形成され、他方の辺に前記雄ねじの外径より若干大きな径の通し穴が形成されたばね板ナットの前記２辺間に、前記締結対象物を挟み込んで前記ばね板ナットの他方の辺を前記主体に重ね、この状態で前記ばね板ナットの下穴に前記雄ねじをねじ込むことで、前記締結対象物が前記ばね板ナットの下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記締結対象物の通し穴の周縁部に順に接しながら当該通し穴内に進入して行くことにより、前記締結対象物が前記心ずれを修正する方向に移動し、且つ、前記軸部が前記主体の下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記主体の下穴の周縁部に順に接しながら当該下穴内に進入して行くことにより、前記軸部が前記主体に対して前記ばね板ナット及び前記締結対象物と共に前記心ずれを修正する方向に移動し、前記雄ねじを前記主体の下穴内にねじ込むことにより、前記雄ねじのセルフタッピング作用で前記主体の下穴の内周面にねじを形成しながら前記主体の下穴に螺合し、且つ前記ばね板ナットの前記下穴が前記軸部の前記頭部側の雄ねじの端から外れて、前記一方の辺が前記首下部分に移ることで、前記締結対象物を前記主体に締結することを特徴とするものである。
又、本発明の締結方法は、上記の目的を達成するために、セルフタッピング作用を有する雄ねじが形成された軸部の一端部に頭部を形成し、前記軸部は前記雄ねじの両端のうち前記頭部側の端から前記頭部までの間に前記雄ねじが形成されていない首下部分を有し、前記軸部の先端部に当該軸部の最小谷径と同径またはやや小なる径のストレート部を形成し、このストレート部の先端部に当該ストレート部の径と同径の半球状部を形成して構成されたセルフタッピングねじで、前記雄ねじの外径より若干大きい径の通し穴が形成された締結対象物を、前記最小谷径より若干大きい径の下穴が形成された主体に締結する締結方法であって、略Ｕ字状に形成され、その対向２辺のうち一方の辺に前記最小谷径より若干大きい径の下穴が形成され、他方の辺に前記雄ねじの外径より若干大きな径の通し穴が形成されたばね板ナットの前記２辺間に、前記締結対象物を挟み込んで前記ばね板ナットの他方の辺を前記主体に重ね、この状態で前記ばね板ナットの下穴に前記雄ねじをねじ込むことで、前記締結対象物が前記ばね板ナットの下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記締結対象物の通し穴の周縁部に順に接しながら当該通し穴内に進入して行くことにより、前記締結対象物が前記心ずれを修正する方向に移動し、且つ、前記軸部が前記主体の下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記主体の下穴の周縁部に順に接しながら当該下穴内に進入して行くことにより、前記軸部が前記主体に対して前記ばね板ナット及び前記締結対象物と共に前記心ずれを修正する方向に移動し、前記雄ねじを前記主体の下穴内にねじ込むことにより、前記雄ねじのセルフタッピング作用で前記主体の下穴の内周面にねじを形成しながら前記主体の下穴に螺合し、且つ前記ばね板ナットの前記下穴が前記軸部の前記頭部側の雄ねじの端から外れて、前記一方の辺が前記首下部分に移ることで、前記締結対象物を前記主体に締結することを特徴とするものである。
【０００６】
本発明によれば、セルフタッピングねじの先端部が半球状をなしているので、先端部を締結対象物にぶつけたりしても、傷を付けてしまう恐れはない。また、重ねられた締結対象物の穴がずれていたとしても、先端部の半球状部がガイド部として機能し、穴に円滑に挿入されるようになる。
【０００８】
【発明の実施の形態】
以下、本発明の一実施例を図１ないし図５を参照しながら説明する。
図１にはセルフタッピングねじ１が示されている。同図において、雄ねじ２が形成された軸部３の一端部には、頭部４が形成されており、この頭部４には、ドライバなどの締め付け工具を係合させるためのすり割り或いは十字穴などが形成されている。
【０００９】
この実施例のセルフタッピングねじ１は、雄ねじ２の両端のうち頭部４側の端から頭部４までの間に雄ねじ２が形成されていない首下部分を有し、軸部３の雄ねじ２の谷の径は、首下部分から軸部３の先端側まで同一となっている。これに対し、雄ねじ２の山の高さは、軸部３の先端側の所定の軸方向長さ範囲において軸部３の先端に行くに従って次第に低くなっており、従って雄ねじ２の外径は、軸部３の先端側の所定の軸方向長さ範囲において次第に小さくなっている。
【００１０】
さて、軸部３の先端部には、雄ねじ２の谷の径ｄと同等または当該谷の径ｄよりやや小さな、具体的には０．２ｍｍほど小さな径ｄ0 のストレート部５が形成され、更にこのストレート部５に続いて当該ストレート部５の径ｄ0 と同径の半球状部６が形成されている。
【００１１】
ここで、ストレート部５および半球状部６は、切削加工によらず、軸部３に雄ねじ２を転造によって形成する際に同時に形成するようにしている。これにより、ストレート部５および半球状部６を加工コストの上昇を伴うことなく形成できるようにしている。
【００１２】
上記のセルフタッピングねじ１によって締結対象物を締結する場合の作用を述べる。ここでは、図２に示すように、自動車のボディのような板状の主体７に２枚の板状の締結物８、９をばね板ナット１０を用いて締結する場合に適用した例で説明する。なお、主体７には、セルフタッピングねじ１の谷の径ｄより若干大きい径の下穴１１が形成され、締結物８、９には、セルフタッピングねじ１の雄ねじ２の外径より若干大きな径の通し穴１２、１３が形成されている。また、ばね板ナット１０は略Ｕ字状に形成され、その対向２辺のうち一方の辺１０ａにはセルフタッピングねじ１の谷の径ｄより若干大きい径の下穴１４を有した隆起部１５が形成され、他方の辺１０ｂにはセルフタッピングねじ１の雄ねじ２の外径より若干大きな径の通し穴１６が形成されている。なお、下穴１４は図３に示すようにＵ字状の切欠１４ａを延長して有しており、全体としては鍵穴形状となっている。
【００１３】
主体７に締結物８、９を締結するには、まず、締結物８、９を重ねてばね板ナット１０の２辺１０ａ、１０ｂ間に挟み込む。この状態で、締結物８、９を主体７に重ね、セルフタッピングねじ１をばね板ナット１０の下穴１４にねじ込む。すると、セルフタッピングねじ１の先端部分が下穴１４から下に突出し、締結物８、９の通し穴１２、１３内に進入して行く。そして、セルフタッピングねじ１の先端部分が主体７の下穴１１内に進入してねじ込まれて行く。以上により、セルフタッピングねじ１が主体７の下穴１１の内周面に自らが形成したねじに螺合して行き、ばね板ナット１０の一方の辺１０ａが軸部３の頭部４側の雄ねじ２から外れて、セルフタッピングねじ１の首下部分に移ることで、締結物８、９を当該主体７に締結する。また、このセルフタッピングねじ１の締結によってばね板ナット１０が弾性変形し、その弾発力によってセルフタッピングねじ１の緩みを防止する。
【００１４】
ところで、セルフタッピングねじ１を上述のようにしてねじ込んで行く際、主体７の下穴１１、締結物８、９の通し穴１２、１３とばね板ナット１０の下穴１４とが図２に示すように、心ずれしていたとする。このような心ずれが生じていた場合、セルフタッピングねじ１をばね板ナット１０の下穴１４にねじ込んで行くと、まず、セルフタッピングねじ１の半球状部６が図４（ａ）に示すよう締結物８の通し穴１２の周縁部に当接する。この状態で更にセルフタッピングねじ１がねじ込まれて行くと、これに伴って通し穴１２の周縁部に対する半球状部６の当接位置が次第にストレート部５側へと移って行くので、セルフタッピングねじ１がばね板ナット１０と一緒に締結物８に対して相対的に矢印Ａ方向に移動し、図４（ｂ）に示すように、セルフタッピングねじ１と通し穴１２とが略同心となる。
【００１５】
締結物９の通し穴１３、主体７の下穴１１についても、上記締結物８の通し穴１２に対する場合と同様にしてセルフタッピングねじ１と略同心となる。そして、最後の主体７の下穴１１にセルフタッピングねじ１が侵入する場合、半球状部６の根元部分がストレート部５となっていることにより、セルフタッピングねじ１が図５に二点鎖線で示すように下穴１１に対して傾いていても、同図に実線で示すようにその傾きが是正される。この場合、ストレート部５の長さは雄ねじ２の１ピッチ以上、すなわちセルフタッピングねじ１が１回転する間に螺進する長さ以上あるので、セルフタッピングねじ１が少なくとも１回転する間はストレート部５が下穴１１の内周面に対して面で接するようになり、傾き是正効果が向上する。
【００１６】
図６は本発明の他の実施例を示すもので、上記一実施例との相違は、雄ねじ４の谷の径が軸部３の先端部分で次第に径小となるところにあり、他は上記一実施例と同一である。この場合、半球状部６の径ｄ0 は谷の最小径ｄと同一或いはやや小さく設定するものである。
【００１７】
なお、本発明は上記し且つ図面に示す実施例に限定されるものではなく、以下のような拡張或いは変更が可能である。
セルフタッピングねじをねじ込む主体は板状のものに限られない。セルフタッピングねじをねじ込む下穴の深さは深くとも良い。
【図面の簡単な説明】
【図１】本発明の一実施例を示すもので、セルフタッピングねじの側面図
【図２】セルフタッピングねじをねじ込む時の断面図
【図３】締結対象物を挟んだばね板ナットの平面図
【図４】セルフタッピングねじの調心作用を説明するための断面図
【図５】セルフタッピングねじの傾き修正作用を説明するための断面図
【図６】本発明の他の実施例を示す図１相当図
【図７】従来のセルフタッピングねじの側面図
【符号の説明】
図中、１はセルフタッピングねじ、２は雄ねじ、３は軸部、４は頭部、５はストレート部、６は半球状部、７は主体、８、９は締結物（締結対象物）、１０はばね板ナット、１０ａ、１０ｂは辺、１２、１３は通し穴、１１および１４は下穴である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-tapping screw having a hemispherical portion at a tip portion.
[0002]
[Problems to be solved by the invention]
As shown in FIG. 7A, the self-tapping screw has a shape with a sharp tip (sharp tip) as shown in FIG. 7A, or a screw with a flat tip (flat) as shown in FIG. 7B. The first) is common.
[0003]
However, when any self-tapping screw of any shape is inserted into the prepared hole opened in the fastening object, the object may be damaged if the tip is hit against the fastening object. In particular, when the object to be fastened is painted, there is a problem that the coating film is damaged and rust is generated. Further, when the two plate members are fastened, if the holes formed in the two plate members are shifted, it is difficult to pass the self-tapping screw through the holes.
[0004]
The present invention has been made in view of the above circumstances, and the purpose thereof is that there is no risk of damage even if the tip portion hits the fastening object, and the pilot holes of the stacked fastening objects are displaced. However, it is to provide a self-tapping screw that can be easily passed through the hole.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the self-tapping screw of the present invention forms a head at one end portion of a shaft portion on which a male screw having a self-tapping action is formed, and the shaft portion is the end of the both ends of the male screw. It has the neck lower portion where the male screw is not formed between the end of the head side to the head, the minimum root diameter and the same diameter or slightly smaller becomes the diameter of this shaft portion to the distal end of the shaft portion The straight portion is formed, and a hemispherical portion having the same diameter as the straight portion is formed at the tip of the straight portion, and a through hole having a diameter slightly larger than the outer diameter of the male screw is formed. A self-tapping screw for fastening an object to a main body in which a pilot hole having a diameter slightly larger than the minimum valley diameter is formed. The self-tapping screw is formed in a substantially U-shape, and the outermost two sides are arranged on the outermost side. A pilot hole with a diameter slightly larger than the Otani diameter is formed, In this state, the object to be fastened is sandwiched between the two sides of the spring plate nut in which a through hole having a diameter slightly larger than the outer diameter of the male screw is formed on the side, and the other side of the spring plate nut is overlapped with the main body. When the male object is screwed into the pilot hole of the spring plate nut, the hemispherical portion and the straight portion are fastened when the object to be fastened is displaced from the pilot hole of the spring plate nut. The fastening object moves in a direction to correct the misalignment by entering the through hole while sequentially contacting the peripheral edge of the through hole of the object, and the shaft portion is under the main body. When a misalignment has occurred with respect to the hole, the hemispherical portion and the straight portion enter the pilot hole while sequentially contacting the peripheral edge of the pilot hole of the main body, whereby the shaft portion becomes the main body. Against the spring plate And moving together with the fastening object in the direction of correcting the misalignment, and screwing the male screw into the pilot hole of the main body, thereby forming a screw on the inner peripheral surface of the pilot hole of the main body by self-tapping action of the male screw While the screw hole is screwed into the pilot hole of the main body, and the pilot hole of the spring plate nut is disengaged from the end of the male screw on the head side of the shaft portion, and the one side moves to the lower neck portion. Then, the fastening object is fastened to the main body.
Further, in order to achieve the above object, the fastening method of the present invention forms a head at one end of a shaft portion on which a male screw having a self-tapping action is formed, and the shaft portion is located at both ends of the male screw. has the neck lower portion where the male screw is not formed between the end of the head side to the head, the minimum becomes the root diameter and the same diameter or slightly smaller in those shaft portion to the distal end of the shaft portion A self-tapping screw formed by forming a straight portion with a diameter and forming a hemispherical portion with the same diameter as the straight portion at the tip of the straight portion. A fastening method for fastening a fastening object in which a hole is formed to a main body in which a pilot hole having a diameter slightly larger than the minimum valley diameter is formed, and is formed in a substantially U shape, and one of the two opposing sides A pilot hole having a diameter slightly larger than the minimum valley diameter is formed on the side of Between the two sides of the spring leaf nut in which a through hole having a diameter slightly larger than the outer diameter of the male screw is formed on the other side, the object to be fastened is sandwiched and the other side of the spring leaf nut is overlapped with the main body, In this state, by screwing the male screw into the pilot hole of the spring plate nut, when the object to be fastened is misaligned with respect to the pilot hole of the spring plate nut, the hemispherical part and the straight part are By entering the through hole while sequentially contacting the peripheral edge of the through hole of the fastening object, the fastening object moves in a direction to correct the misalignment, and the shaft portion is the main body. When the center shift occurs with respect to the pilot hole, the hemispherical portion and the straight portion enter the pilot hole while sequentially contacting the peripheral edge of the pilot hole of the main body, so that the shaft portion is The spring plate against the main body And the fastening object are moved in a direction to correct the misalignment, and the male screw is screwed into the inner hole of the main body by self-tapping action by screwing the male screw into the lower hole of the main body. Are screwed into the pilot hole of the main body, and the pilot hole of the spring plate nut is disengaged from the end of the male screw on the head side of the shaft portion, and the one side is in the lower neck portion. By moving, the fastening object is fastened to the main body.
[0006]
According to the present invention, since the tip of the self-tapping screw has a hemispherical shape, there is no risk of scratching even if the tip is hit against a fastening object. In addition, even if the holes of the overlapped fastening objects are displaced, the hemispherical portion at the tip functions as a guide portion and is smoothly inserted into the hole.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a self-tapping screw 1. In the drawing, a head 4 is formed at one end of a shaft portion 3 on which a male screw 2 is formed. A slit or cross for engaging a tightening tool such as a screwdriver is formed on the head 4. A hole or the like is formed.
[0009]
The self-tapping screw 1 of this embodiment has a lower neck portion where the male screw 2 is not formed between the end of the head 4 side and the head 4 of both ends of the male screw 2 , and the male screw 2 of the shaft portion 3. The diameter of the valley is the same from the neck lower part to the tip side of the shaft part 3. On the other hand, the height of the crest of the male screw 2 gradually decreases toward the tip of the shaft portion 3 in a predetermined axial length range on the tip side of the shaft portion 3, and therefore the outer diameter of the male screw 2 is The length gradually decreases in a predetermined axial length range on the tip side of the shaft portion 3.
[0010]
Now, a straight portion 5 having a diameter d0 which is equal to or slightly smaller than the diameter d of the valley of the male screw 2 is formed at the tip of the shaft portion 3, specifically, about 0.2 mm. Subsequent to the straight portion 5, a hemispherical portion 6 having the same diameter as the diameter d0 of the straight portion 5 is formed.
[0011]
Here, the straight portion 5 and the hemispherical portion 6 are formed at the same time when the male screw 2 is formed on the shaft portion 3 by rolling, regardless of the cutting process. As a result, the straight portion 5 and the hemispherical portion 6 can be formed without increasing the processing cost.
[0012]
The operation when the fastening object is fastened by the self-tapping screw 1 will be described. Here, as shown in FIG. 2, description will be made with an example applied to a case where two plate-like fasteners 8 and 9 are fastened to a plate-like main body 7 such as a car body using a spring plate nut 10. To do. The main body 7 is formed with a pilot hole 11 having a diameter slightly larger than the valley diameter d of the self-tapping screw 1, and the fasteners 8 and 9 have a diameter slightly larger than the outer diameter of the male screw 2 of the self-tapping screw 1. Through holes 12 and 13 are formed. The spring plate nut 10 is formed in a substantially U-shape, and a raised portion 15 having a pilot hole 14 having a diameter slightly larger than the diameter d of the valley of the self-tapping screw 1 on one side 10a of the two opposing sides. A through hole 16 having a diameter slightly larger than the outer diameter of the male screw 2 of the self-tapping screw 1 is formed on the other side 10b. As shown in FIG. 3, the pilot hole 14 has a U-shaped notch 14a extended, and has a keyhole shape as a whole.
[0013]
In order to fasten the fasteners 8 and 9 to the main body 7, first, the fasteners 8 and 9 are overlapped and sandwiched between the two sides 10 a and 10 b of the spring plate nut 10. In this state, the fasteners 8 and 9 are stacked on the main body 7, and the self-tapping screw 1 is screwed into the pilot hole 14 of the spring plate nut 10. Then, the tip portion of the self-tapping screw 1 protrudes downward from the pilot hole 14 and enters the through holes 12 and 13 of the fasteners 8 and 9. Then, the tip portion of the cell Ruff tapping screw 1 is gradually screwed enters into the prepared hole 11 of the main 7. Thus, the self-tapping screw 1 is screwed onto the screw formed by itself on the inner peripheral surface of the pilot hole 11 of the main body 7, and one side 10 a of the spring plate nut 10 is located on the head 4 side of the shaft portion 3. The fasteners 8 and 9 are fastened to the main body 7 by detaching from the male screw 2 and moving to the lower neck portion of the self-tapping screw 1 . Further, the spring plate nut 10 is elastically deformed by the fastening of the self-tapping screw 1, and the self-tapping screw 1 is prevented from loosening by its elastic force.
[0014]
When the self-tapping screw 1 is screwed in as described above, the pilot hole 11 of the main body 7, the through holes 12 and 13 of the fasteners 8 and 9, and the pilot hole 14 of the spring plate nut 10 are shown in FIG. Suppose you are out of alignment. When such a misalignment occurs, when the self-tapping screw 1 is screwed into the pilot hole 14 of the spring plate nut 10, first, the hemispherical portion 6 of the self-tapping screw 1 is as shown in FIG. It contacts the peripheral edge of the through hole 12 of the fastener 8. When the self-tapping screw 1 is further screwed in this state, the contact position of the hemispherical portion 6 with respect to the peripheral portion of the through hole 12 is gradually moved toward the straight portion 5 accordingly. 1 moves together with the spring plate nut 10 in the direction of the arrow A relative to the fastener 8, and the self-tapping screw 1 and the through hole 12 are substantially concentric as shown in FIG. 4 (b).
[0015]
The through hole 13 of the fastener 9 and the pilot hole 11 of the main body 7 are also substantially concentric with the self-tapping screw 1 in the same manner as in the case of the through hole 12 of the fastener 8. When the self-tapping screw 1 enters the pilot hole 11 of the last main body 7, the base portion of the hemispherical portion 6 is the straight portion 5, so that the self-tapping screw 1 is shown by a two-dot chain line in FIG. 5. As shown, even if it is inclined with respect to the pilot hole 11, the inclination is corrected as indicated by the solid line in FIG. In this case, since the length of the straight portion 5 is one pitch or more of the male screw 2, that is, the length that the self-tapping screw 1 is screwed during one revolution, the straight portion 5 is at least one revolution while the self-tapping screw 1 is at least one revolution. 5 comes in contact with the inner peripheral surface of the pilot hole 11 on the surface, and the tilt correction effect is improved.
[0016]
FIG. 6 shows another embodiment of the present invention. The difference from the above-mentioned embodiment is that the diameter of the valley of the male screw 4 becomes gradually smaller at the tip portion of the shaft portion 3, and the other is the above. This is the same as one embodiment. In this case, the diameter d0 of the hemispherical portion 6 is set to be the same as or slightly smaller than the minimum diameter d of the valley.
[0017]
The present invention is not limited to the embodiments described above and shown in the drawings, and can be expanded or changed as follows.
The main body into which the self-tapping screw is screwed is not limited to a plate-like one. The depth of the pilot hole into which the self-tapping screw is screwed may be deep.
[Brief description of the drawings]
FIG. 1 is a side view of a self-tapping screw according to an embodiment of the present invention. FIG. 2 is a cross-sectional view when the self-tapping screw is screwed in. FIG. 3 is a plan view of a spring plate nut sandwiching a fastening object. FIG. 4 is a cross-sectional view for explaining a self-tapping screw aligning action. FIG. 5 is a cross-sectional view for explaining a self-tapping screw tilt correcting action. FIG. 6 is a view showing another embodiment of the invention. 1 equivalent diagram [Fig. 7] Side view of a conventional self-tapping screw [Explanation of symbols]
In the figure, 1 is a self-tapping screw, 2 is a male screw, 3 is a shaft part, 4 is a head part, 5 is a straight part, 6 is a hemispherical part, 7 is a main body, 8 and 9 are fastening objects (fastening objects), 10 is a spring plate nut, 10a and 10b are sides, 12, 13 are through holes, and 11 and 14 are pilot holes.

Claims (2)

セルフタッピング作用を有する雄ねじが形成された軸部の一端部に頭部を形成し、前記軸部は前記雄ねじの両端のうち前記頭部側の端から前記頭部までの間に前記雄ねじが形成されていない首下部分を有し、前記軸部の先端部に当該軸部の最小谷径と同径またはやや小なる径のストレート部を形成し、このストレート部の先端部に当該ストレート部の径と同径の半球状部を形成して構成され、前記雄ねじの外径より若干大きい径の通し穴が形成された締結対象物を、前記最小谷径より若干大きい径の下穴が形成された主体に締結するセルフタッピングねじであって、
略Ｕ字状に形成され、その対向２辺のうち一方の辺に前記最小谷径より若干大きい径の下穴が形成され、他方の辺に前記雄ねじの外径より若干大きな径の通し穴が形成されたばね板ナットの前記２辺間に、前記締結対象物を挟み込んで前記ばね板ナットの他方の辺を前記主体に重ね、
この状態で前記ばね板ナットの下穴に前記雄ねじをねじ込むことで、前記締結対象物が前記ばね板ナットの下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記締結対象物の通し穴の周縁部に順に接しながら当該通し穴内に進入して行くことにより、前記締結対象物が前記心ずれを修正する方向に移動し、
且つ、前記軸部が前記主体の下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記主体の下穴の周縁部に順に接しながら当該下穴内に進入して行くことにより、前記軸部が前記主体に対して前記ばね板ナット及び前記締結対象物と共に前記心ずれを修正する方向に移動し、
前記雄ねじを前記主体の下穴内にねじ込むことにより、前記雄ねじのセルフタッピング作用で前記主体の下穴の内周面にねじを形成しながら前記主体の下穴に螺合し、且つ前記ばね板ナットの前記下穴が前記軸部の前記頭部側の雄ねじの端から外れて、前記一方の辺が前記首下部分に移ることで、前記締結対象物を前記主体に締結することを特徴とするセルフタッピングねじ。A head is formed at one end of a shaft portion on which a male screw having a self-tapping action is formed, and the shaft is formed between the both ends of the male screw from the head-side end to the head. is a neck lower part not, the shaft portion of the distal end portion of the minimum root diameter and the same diameter or a straight portion slightly smaller becomes the diameter of this shaft portion is formed in, the straight portion at the distal end of the straight portion Forming a hemispherical portion having the same diameter as the outer diameter of the male screw and forming a through hole having a diameter slightly larger than the outer diameter of the male screw, and forming a prepared hole having a diameter slightly larger than the minimum valley diameter A self-tapping screw to be fastened to the main body,
It is formed in a substantially U shape, a pilot hole having a diameter slightly larger than the minimum valley diameter is formed on one of the two opposite sides, and a through hole having a diameter slightly larger than the outer diameter of the male screw is formed on the other side. Between the two sides of the formed spring leaf nut, the object to be fastened is sandwiched and the other side of the spring leaf nut is overlapped on the main body,
In this state, by screwing the male screw into the pilot hole of the spring plate nut, when the object to be fastened is misaligned with respect to the pilot hole of the spring plate nut, the hemispherical part and the straight part are By entering the through hole while sequentially contacting the peripheral edge of the through hole of the fastening object, the fastening object moves in a direction to correct the misalignment,
In addition, when the shaft portion is misaligned with respect to the pilot hole of the main body, the hemispherical portion and the straight portion enter the pilot hole while sequentially contacting the peripheral edge of the main hole of the main body. By going, the shaft moves together with the spring plate nut and the fastening object with respect to the main body in a direction to correct the misalignment,
By screwing the male screw into the pilot hole of the main body, the self-tapping action of the male screw is screwed into the pilot hole of the main body while forming a screw on the inner peripheral surface of the main hole of the main body, and the spring plate nut The pilot hole is disengaged from an end of the male screw on the head side of the shaft portion, and the one side moves to the neck lower portion, whereby the fastening object is fastened to the main body. Self tapping screw. セルフタッピング作用を有する雄ねじが形成された軸部の一端部に頭部を形成し、前記軸部は前記雄ねじの両端のうち前記頭部側の端から前記頭部までの間に前記雄ねじが形成されていない首下部分を有し、前記軸部の先端部に当該軸部の最小谷径と同径またはやや小なる径のストレート部を形成し、このストレート部の先端部に当該ストレート部の径と同径の半球状部を形成して構成されたセルフタッピングねじで、前記雄ねじの外径より若干大きい径の通し穴が形成された締結対象物を、前記最小谷径より若干大きい径の下穴が形成された主体に締結する締結方法であって、
略Ｕ字状に形成され、その対向２辺のうち一方の辺に前記最小谷径より若干大きい径の下穴が形成され、他方の辺に前記雄ねじの外径より若干大きな径の通し穴が形成されたばね板ナットの前記２辺間に、前記締結対象物を挟み込んで前記ばね板ナットの他方の辺を前記主体に重ね、
この状態で前記ばね板ナットの下穴に前記雄ねじをねじ込むことで、前記締結対象物が前記ばね板ナットの下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記締結対象物の通し穴の周縁部に順に接しながら当該通し穴内に進入して行くことにより、前記締結対象物が前記心ずれを修正する方向に移動し、
且つ、前記軸部が前記主体の下穴に対して心ずれが生じていたとき、前記半球状部及び前記ストレート部が前記主体の下穴の周縁部に順に接しながら当該下穴内に進入して行くことにより、前記軸部が前記主体に対して前記ばね板ナット及び前記締結対象物と共に前記心ずれを修正する方向に移動し、
前記雄ねじを前記主体の下穴内にねじ込むことにより、前記雄ねじのセルフタッピング作用で前記主体の下穴の内周面にねじを形成しながら前記主体の下穴に螺合し、且つ前記ばね板ナットの前記下穴が前記軸部の前記頭部側の雄ねじの端から外れて、前記一方の辺が前記首下部分に移ることで、前記締結対象物を前記主体に締結することを特徴とする締結方法。A head is formed at one end of a shaft portion on which a male screw having a self-tapping action is formed, and the shaft is formed between the both ends of the male screw from the head-side end to the head. is a neck lower part not, the shaft portion of the distal end portion of the minimum root diameter and the same diameter or a straight portion slightly smaller becomes the diameter of this shaft portion is formed in, the straight portion at the distal end of the straight portion The self-tapping screw formed by forming a hemispherical portion having the same diameter as the diameter of the fastening object in which a through hole having a diameter slightly larger than the outer diameter of the male screw is formed, a diameter slightly larger than the minimum valley diameter A fastening method for fastening to a main body in which a pilot hole is formed,
It is formed in a substantially U shape, a pilot hole having a diameter slightly larger than the minimum valley diameter is formed on one of the two opposite sides, and a through hole having a diameter slightly larger than the outer diameter of the male screw is formed on the other side. Between the two sides of the formed spring leaf nut, the object to be fastened is sandwiched and the other side of the spring leaf nut is overlapped on the main body,
In this state, by screwing the male screw into the pilot hole of the spring plate nut, when the object to be fastened is misaligned with respect to the pilot hole of the spring plate nut, the hemispherical part and the straight part are By entering the through hole while sequentially contacting the peripheral edge of the through hole of the fastening object, the fastening object moves in a direction to correct the misalignment,
In addition, when the shaft portion is misaligned with respect to the pilot hole of the main body, the hemispherical portion and the straight portion enter the pilot hole while sequentially contacting the peripheral edge of the main hole of the main body. By going, the shaft moves together with the spring plate nut and the fastening object with respect to the main body in a direction to correct the misalignment,
By screwing the male screw into the pilot hole of the main body, the self-tapping action of the male screw is screwed into the pilot hole of the main body while forming a screw on the inner peripheral surface of the main hole of the main body, and the spring plate nut The pilot hole is disengaged from an end of the male screw on the head side of the shaft portion, and the one side moves to the neck lower portion, whereby the fastening object is fastened to the main body. Fastening method.
JP2002004753A 2002-01-11 2002-01-11 Self-tapping screw and fastening method Expired - Lifetime JP4191410B2 (en)

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