JPH062019Y2 - Tapping screw - Google Patents
Tapping screwInfo
- Publication number
- JPH062019Y2 JPH062019Y2 JP1987176686U JP17668687U JPH062019Y2 JP H062019 Y2 JPH062019 Y2 JP H062019Y2 JP 1987176686 U JP1987176686 U JP 1987176686U JP 17668687 U JP17668687 U JP 17668687U JP H062019 Y2 JPH062019 Y2 JP H062019Y2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- screw
- tapping screw
- angle
- synthetic resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
- Connection Of Plates (AREA)
Description
【考案の詳細な説明】 (産業上の利用分野) 本考案は、タッピンねじに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tapping screw.
(従来の技術) 従来、金属製部品または合成樹脂製部品等を合成樹脂製
本体にとりつける場合、本体と一体になったダボ、ボス
またはグロメットに設けられた孔に、ねじ山角度が60
゜で等辺山形に形成されたタッピンねじをねじ込んで締
付けることにより、金属製部品または合成樹脂製部品等
を合成樹脂製本体にとりつけることが一般におこなわれ
ている。(Prior Art) Conventionally, when a metal part, a synthetic resin part, or the like is attached to a synthetic resin main body, a screw angle is 60 in a hole provided in a dowel, a boss, or a grommet integrated with the main body.
It is common practice to attach metal parts, synthetic resin parts, or the like to a synthetic resin body by screwing in and tightening a tapping screw formed in an equilateral angle at an angle of °.
(考案が解決しようとする問題点) しかるに上記従来のタッピンねじによって合成樹脂のよ
うな粘弾性を有する材料に形成された下孔に締付けをお
こなう場合、ねじ山容積が排除した部分に対応する残留
合成樹脂が塑性変形して圧縮されることにより後退し、
したがってねじ山は進み締付けが完了するが、時間の経
過と共にねじ山近辺の合成樹脂の弾性が回復することに
ともない合成樹脂にタッピンねじの半径方向の中心に向
って回復しようとする動きがおこり、これが残留応力と
なる。この残留応力により合成樹脂に発生する動きは、
ねじ山方向へ作用するものの、ねじ山によって阻止され
る結果、ねじ山の反対方向に作用してダボ、ボス等にひ
び割れを発生させる。(Problems to be solved by the invention) However, when tightening a pilot hole formed in a material having viscoelasticity such as synthetic resin with the above-mentioned conventional tapping screw, the residual volume corresponding to the part where the screw thread volume is excluded When the synthetic resin is plastically deformed and compressed, it recedes,
Therefore, the screw thread progresses and tightening is completed, but with the passage of time, the elasticity of the synthetic resin near the screw thread recovers, and the synthetic resin moves toward the center of the tapping screw in the radial direction. This becomes the residual stress. The movement that occurs in synthetic resin due to this residual stress is
Although it acts in the thread direction, it is blocked by the thread and as a result acts in the direction opposite to the thread and causes cracks in the dowels, bosses, and the like.
あるいは、ねじ山の側面を合成樹脂が不規則に滑動する
こととなり、ねじ山の側面と合成樹脂との間に隙間が発
生し、このために締付力が低下して振動、衝撃等を受け
た場合ねじがゆるむという不具合が生じる等の問題があ
った。Alternatively, the synthetic resin slides irregularly on the side surface of the screw thread, creating a gap between the side surface of the screw thread and the synthetic resin, which reduces the tightening force and may cause vibration, impact, etc. In this case, there is a problem that the screw is loosened.
本考案はこれに鑑み、ねじ山角度が60°で等辺山形に
形成されたタッピンねじに代えて、ねじ山角度を30°
〜45°とした連続する2条ねじ山を形成するととも
に、各ねじ山の円周上の180°の位置に稜線方向に所
定の長さを有しリード角に対して直角となるねじ山欠損
部を形成し、このねじ山欠損部は隣接したねじ山に対し
て90°位相が異なるように設けたことにより、相手部
材に割れの発生することがなく、締付力が低下してゆる
むことのないタッピンねじを提供することを目的とす
る。In view of this, the present invention has a thread angle of 30 ° instead of a tapping screw formed in an equilateral thread shape with a thread angle of 60 °.
Defects that form a continuous two-threaded thread of ~ 45 ° and have a predetermined length in the ridge direction at a position of 180 ° on the circumference of each thread and are perpendicular to the lead angle. Part is formed, and the thread missing portion is provided with a 90 ° phase difference with respect to the adjacent thread, so that the mating member does not crack and the tightening force decreases and loosens. The purpose is to provide a self-tapping screw.
(問題点を解決するための手段) 上記目的を達成するため本考案は、軸部に沿って螺旋状
に突起したねじ山と、軸部の一端に工具係合手段を有す
る頭部とを備えたタッピンねじにおいて、前記軸部にね
じ山角度を30°〜45°とした連続する2条のねじ山
を形成するとともに、隣接したねじ山に位相の異なるね
じ山欠損部をその配列がリード角に対して直角となるよ
うに形成したことを特徴とするものである。(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a screw thread protruding in a spiral shape along a shaft, and a head having a tool engaging means at one end of the shaft. In the tapping screw, two continuous threads having a thread angle of 30 ° to 45 ° are formed on the shaft portion, and the thread missing portions having different phases are formed on the adjacent threads by the arrangement of the lead angle. It is characterized in that it is formed to be at a right angle to.
(作用) 本考案によれば、ねじ山角度が30°〜45°の2条ね
じ山を形成することにより、ねじ山容積が排除する部分
の容積を少なくして残留応力を減少させるとともに、2
条ねじ山としたことによりねじ山強度の低下とピッチ間
隔の増大による作業性の低下を防ぎ、さらに位相の異な
るねじ山欠損部をリード角に対して直角に形成したこと
によりねじ山の側面に対する合成樹脂の滑動力を解放す
ることができる。そして、リード角に対して直角となる
ねじ山欠損部を形成したことによりねじ山欠損部の端部
が欠けることはない。さらに、ねじ山欠損部は稜線方向
に所定の長さを有し90°位相が異なるように設けられ
ているので、ねじ山欠損部が相手部材に対して同時に作
用せず、したがって、円滑なねじの回転ともどり止め効
果により相手部材の割れが防止できるとともに締付力が
低下してゆるむことがない。(Operation) According to the present invention, by forming a double thread having a thread angle of 30 ° to 45 °, the volume of the portion excluded by the thread volume is reduced to reduce the residual stress.
The use of thread threads prevents a decrease in thread strength and a decrease in workability due to an increase in pitch interval.Furthermore, a thread defect portion with a different phase is formed at a right angle to the lead angle, and The sliding power of synthetic resin can be released. Further, since the thread deficient portion which is perpendicular to the lead angle is formed, the end portion of the thread deficient portion is not chipped. Further, since the thread deficiency portion has a predetermined length in the ridge direction and is provided so as to be 90 ° out of phase with each other, the thread deficiency portion does not act on the mating member at the same time. With the rotation of, the mating member can be prevented from cracking due to the detent effect, and the tightening force will not decrease and will not loosen.
(実施例) 以下、本考案を図面に示す実施例を参照して説明する。
第1図は本考案の一実施例におけるタッピンねじの正面
を示し、第2図は第1図のねじ山の断面、第3図は第2
図と位相の異なるねじ山の断面を示し、さらに第4図は
ねじ山を一部拡大した断面を示している。上記各図に示
す実施例において、軸部2の一端にねじを駆動させる工
具係合手段3(例えば十字穴)を有する頭部4を、他端
を相手部材への導入を容易にするための適当な先細りの
先端部5とし、軸部2の首下6より先端部5までの間に
谷部径が通常規格品とほぼ等しくねじ山角度θが30°
〜45°の連続した2条のねじ山7,8を形成し、第2
図および第3図に示すようにねじ山7,8に180°対
向の位置に稜線方向に所定の長さを有するねじ山欠損部
9,10をねじ山のリード角に対して直角に形成すると
ともに、隣接するねじ山7,8に対しては90°位相が
異なるように構成されている。(Embodiment) Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.
1 is a front view of a tapping screw according to an embodiment of the present invention, FIG. 2 is a cross section of the thread shown in FIG. 1, and FIG.
The cross section of the screw thread having a phase different from that of the figure is shown, and further, FIG. 4 shows a cross section in which the screw thread is partially enlarged. In the embodiments shown in the above-mentioned drawings, a head 4 having a tool engaging means 3 (for example, a cross hole) for driving a screw is provided at one end of the shaft portion 2, and the other end is provided for facilitating introduction into a mating member. The tip portion 5 has an appropriate taper, and the diameter of the valley portion between the lower portion 6 of the shaft portion 2 and the tip portion 5 is almost equal to that of a standard product, and the thread angle θ is 30 °.
Form two continuous threads 7,8 of ~ 45 °,
As shown in FIG. 3 and FIG. 3, the thread deficient portions 9 and 10 having a predetermined length in the ridge direction are formed at positions 180 ° opposite to the thread ridges 7 and 8 at right angles to the lead angle of the thread ridges. At the same time, the adjacent threads 7 and 8 are configured so as to be 90 ° out of phase with each other.
本考案によるタッピンねじ1は前記のように構成される
ため、合成樹脂のような粘弾性を有する材料で作られた
相手部材に形成された下孔にタッピンねじ1をねじ込む
と、ねじ山容積が排除されるが、ねじ山角度θは30°
〜45°と従来の60°に比べて小さいのでねじ山7,
8は薄く、したがってねじ山7,8が排除する相手部材
の量も少なく、残留合成樹脂が復元しようとする残留応
力も小さくなり、相手部材には割れが発生しない。Since the tapping screw 1 according to the present invention is constructed as described above, when the tapping screw 1 is screwed into the pilot hole formed in the mating member made of a material having viscoelasticity such as synthetic resin, the thread volume is increased. Excluded, but thread angle θ is 30 °
~ 45 °, which is smaller than the conventional 60 °.
8 is thin, therefore the amount of the mating member removed by the threads 7 and 8 is small, the residual stress that the residual synthetic resin tries to restore is small, and the mating member does not crack.
また、2条ねじ山としたことにより、ねじ山強度の低下
を防ぐとともに、少量の残留応力によるねじ山7,8の
側面における合成樹脂の不規則な滑動は、ねじ山7,8
に形成したねじ山欠損部9,10により解放されるので
合成樹脂との間に隙間の生じることはない。In addition, since the double thread is used, the decrease in the thread strength is prevented, and the irregular sliding of the synthetic resin on the side surfaces of the threads 7 and 8 due to a small amount of residual stress prevents the threads 7 and 8 from sliding.
Since it is released by the thread deficient portions 9 and 10 formed in the above, there is no gap between the resin and the synthetic resin.
以上説明したように本考案は、ねじ山角度が30°〜4
5°の2条ねじ山を形成したことにより、ねじ山部の剪
断強さは若干低下するがねじ込みトルクも小さくなる。
そして、1ピッチ当りのねじ山容積が排除する部分の容
積を少なくすることとなり、相手部材の残留応力を減少
させてねじ込み性を良くするので、割れは発生せず、ま
た、ねじ山強度の低下とピッチ間隔の増大による作業性
の低下を防ぎ、さらにねじ山欠損部を形成したことによ
り合成樹脂の滑動力を解放することができるので、締付
力の低下することがなく、振動、衝撃等に対して強いタ
ッピンねじが提供できる。そして、リード角に対して直
角となるねじ山欠損部を形成したことにより、ねじ山欠
損部の端部は鋭角でなく90°に形成されるので、鋭角
の場合に比べ端部の欠けることがない。さらに、このね
じ山欠損部は稜線方向に所定の長さを有し隣接したねじ
山に対して90°位相が異なるように設けているので、
タッピンねじをねじ込む時あるいは戻す時において2条
のねじのねじ山欠損部が同時に作用することはなく1条
目のねじ山欠損部が作用した後に2条目のねじ山欠損部
が作用するので円滑なねじの回転とともに、1条目と2
条目とが交互にもどり止めの効果を有する等の効果を奏
する。As described above, the present invention has a thread angle of 30 ° to 4 °.
By forming the 5 ° double thread, the shear strength of the thread portion is slightly reduced, but the screwing torque is also reduced.
Then, the volume of the screw thread volume per pitch is eliminated, which reduces the residual stress of the mating member and improves the screwability, so that cracking does not occur and the thread strength decreases. It is possible to prevent the workability from deteriorating due to the increase of the pitch pitch and to further reduce the slipping force of the synthetic resin by forming the thread deficiency. A strong tapping screw can be provided. By forming the thread deficient portion at a right angle to the lead angle, the end portion of the thread deficient portion is formed at 90 ° rather than at an acute angle, and thus the end portion may be chipped as compared with the case of an acute angle. Absent. Furthermore, since the thread deficient portion has a predetermined length in the ridge direction and is provided so as to be 90 ° out of phase with the adjacent thread,
When the tapping screw is screwed in or returned, the thread missing portions of the two threads do not act at the same time, and the thread missing portion of the second thread acts after the thread missing portion of the first thread acts, resulting in a smooth screw. With the rotation of 1st article and 2
There is an effect such that the ridges and the creases alternately have a detent effect.
第1図は本考案の一実施例におけるタッピンねじの正面
図、第2図は第1図のねじ山の断面図、第3図は第2図
と位相の異なるねじ山の断面図、第4図はねじ山を一部
拡大した断面図である。 1…タッピンねじ、2…軸部、3…工具係合手段、4…
頭部、5…先端部、6…首下、7,8…ねじ山、9,1
0…ねじ山欠損部、θ…ねじ山角度。1 is a front view of a self-tapping screw according to an embodiment of the present invention, FIG. 2 is a sectional view of the thread of FIG. 1, FIG. 3 is a sectional view of a thread having a phase different from that of FIG. 2, and FIG. The figure is a cross-sectional view in which a screw thread is partially enlarged. DESCRIPTION OF SYMBOLS 1 ... Tapping screw, 2 ... Shaft part, 3 ... Tool engaging means, 4 ...
Head, 5 ... Tip, 6 ... Under neck, 7, 8 ... Thread, 9, 1
0 ... thread missing part, θ ... thread angle.
Claims (1)
軸部の一端に工具係合手段を有する頭部とを備えたタッ
ピンねじにおいて、前記軸部にねじ山角度を30°〜4
5°とした連続する2条のねじ山を形成するとともに、
各ねじ山の円周上の180°の位置に稜線方向に所定の
長さを有しリード角に対して直角となるねじ山欠損部を
形成し、このねじ山欠損部は隣接したねじ山に対して9
0°位相が異なるように設けたことを特徴とするタッピ
ンねじ。Claim: What is claimed is: 1. A screw thread that spirally protrudes along the shaft portion,
A tapping screw having a head having a tool engaging means at one end of a shaft portion, wherein the shaft portion has a thread angle of 30 ° to 4 °.
In addition to forming two consecutive threads of 5 °,
At a position of 180 ° on the circumference of each screw thread, a thread defect portion having a predetermined length in the ridge direction and being perpendicular to the lead angle is formed. To 9
A tapping screw characterized by being provided with 0 ° phase difference.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987176686U JPH062019Y2 (en) | 1987-11-19 | 1987-11-19 | Tapping screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987176686U JPH062019Y2 (en) | 1987-11-19 | 1987-11-19 | Tapping screw |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0180810U JPH0180810U (en) | 1989-05-30 |
JPH062019Y2 true JPH062019Y2 (en) | 1994-01-19 |
Family
ID=31468402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987176686U Expired - Lifetime JPH062019Y2 (en) | 1987-11-19 | 1987-11-19 | Tapping screw |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH062019Y2 (en) |
-
1987
- 1987-11-19 JP JP1987176686U patent/JPH062019Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0180810U (en) | 1989-05-30 |
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