JPH0953620A - Tapping screw - Google Patents
Tapping screwInfo
- Publication number
- JPH0953620A JPH0953620A JP20979295A JP20979295A JPH0953620A JP H0953620 A JPH0953620 A JP H0953620A JP 20979295 A JP20979295 A JP 20979295A JP 20979295 A JP20979295 A JP 20979295A JP H0953620 A JPH0953620 A JP H0953620A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- screw
- tapping screw
- shape
- tapping
- 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.)
- Granted
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Abstract
(57)【要約】
【課題】 ねじ込みトルク、戻しトルク、および締結力
を適切に両立する。
【解決手段】 ねじ部14のねじ山12を、４５度間隔で設
けた多数の頂部21と、これら頂部21を互いに連接する連
接部22とから形成し、ねじ山12の外形の輪郭形状を八角
形状とする。各連接部22は、それぞれねじ部14の内周側
に向かって弧状に凹設する。
(57) [Abstract] [PROBLEMS] To appropriately balance screwing torque, returning torque, and fastening force. SOLUTION: The thread 12 of the screw portion 14 is formed from a large number of tops 21 provided at intervals of 45 degrees, and a connecting portion 22 connecting these tops 21 to each other, and the outer shape of the thread 12 is octagonal. The shape. Each connecting portion 22 is recessed in an arc shape toward the inner peripheral side of the screw portion 14.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ねじ込まれる部材
にねじ溝を形成可能なタッピンねじに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapping screw capable of forming a thread groove on a member to be screwed.
【０００２】[0002]
【従来の技術】従来、ねじ溝を塑性加工によって形成し
ながら所定の部材にねじ込まれるタッピンねじが用いら
れている。2. Description of the Related Art Conventionally, tapping screws which are screwed into a predetermined member while forming a thread groove by plastic working have been used.
【０００３】そして、この種のタッピンねじのねじ部に
は、軸方向からみたねじ山の外形が、真円形をなすも
の、三つの頂部をもつ三角形状のもの、あるいは六つの
頂部をもつ六角形状のものが知られている。また、三角
形状あるいは六角形状のねじ山は、各頂部と、これらの
頂部を互いに連接する連接部とからなり、これらの連接
部は、直線状か、あるいは僅かに外周側に膨出する弧状
に形成されている。The threaded portion of this type of tapping screw has a screw thread whose outer shape when viewed from the axial direction is a perfect circle, a triangular shape having three peaks, or a hexagonal shape having six peaks. Are known. Further, the triangular or hexagonal screw thread is composed of each top portion and a connecting portion connecting these top portions to each other, and these connecting portions are formed in a straight line shape or an arc shape that slightly bulges toward the outer peripheral side. Has been formed.
【０００４】しかしながら、ねじ山の外形が真円形をな
すねじ部をもつタッピンねじは、ねじ山の外形が三角形
状あるいは六角形状のものに比べて、ねじ込みトルクが
大きく作業性が悪い問題を有している。そして、真円形
のねじ山では、作業性を良くする目的でねじ込みトルク
を小さくすると、ねじ戻しトルクも小さくなるため、部
材にねじ込んだタッピンねじが緩み易くなる問題を有し
ている。However, a tapping screw having a thread portion in which the outer shape of the screw thread is a perfect circle has a problem that the screwing torque is large and the workability is poor as compared with the screw thread having a triangular or hexagonal outer shape. are doing. In the case of a true circular thread, if the screwing torque is reduced for the purpose of improving workability, the screw returning torque also decreases, so that there is a problem that the tapping screw screwed into the member easily loosens.
【０００５】また、ねじ山の外形が三角形状あるいは六
角形状のねじ部を持つタッピンねじは、ねじ込み後に部
材のねじ溝に噛合する部分が３箇所あるいは６箇所であ
るので、ねじ山の外形が真円形のものに比べて、部材の
ねじ溝に噛合する部分が小さいため、締結力も小さくな
る問題を有している。Further, a tapping screw having a triangular or hexagonal screw thread outer shape has three or six portions which mesh with the thread groove of the member after screwing in, so that the outer shape of the screw thread is true. Since the portion that meshes with the thread groove of the member is smaller than the circular one, there is a problem that the fastening force is also small.
【０００６】[0006]
【発明が解決しようとする課題】上記のように、ねじ山
の外形が真円形をなすねじ部をもつタッピンねじは、ね
じ込みトルクが大きく作業性が悪いという問題を有し、
ねじ山の外形が三角形状あるいは六角形状をなすタッピ
ンねじは、締結力が小さいという問題を有している。As described above, a tapping screw having a thread portion in which the outer shape of the screw thread is a perfect circle has a problem that the screwing torque is large and the workability is poor.
A tapping screw having a triangular or hexagonal external shape has a problem that the fastening force is small.
【０００７】本発明は、このような点に鑑みなされたも
ので、ねじ込みトルクを低くして作業性を良くするとと
もに締結力を大きくして緩み難くするという両者を適切
に両立させるタッピンねじを提供することを目的とす
る。The present invention has been made in view of the above points, and provides a tapping screw that appropriately lowers the screwing torque to improve workability and increases the fastening force to make it difficult to loosen. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】請求項１記載のタッピン
ねじは、所定の間隔で設けられた複数の頂部と、これら
頂部を互いに連接する連接部とを有するねじ山を形成し
たねじ部を備え、前記各連接部は、それぞれ前記ねじ部
の内周側に向かって弧状に凹設されたものである。そし
て、この構成では、ねじ部のねじ山を、所定の間隔で設
けられた複数の頂部と、これら頂部を互いに連接する連
接部とから形成するとともに、各連接部は、それぞれね
じ部の内周側に向かって弧状に凹設したので、ねじ山に
頂部を頂点とする複数の角部が形成される。また、この
角部における隣接する二つの連接部の内周側に向かって
凹設した弧状の曲線に接する仮の直線がなす内角は、ね
じ山の外形形状が従来の三角形状のものあるいは六角形
状のものの角部における隣接する二つの連接部の直線が
なす内角、あるいは、外周側に膨出する円弧状の連接部
に接する仮の直線がなす内角より鋭角になる。A tapping screw according to claim 1 is provided with a threaded portion having a thread having a plurality of top portions provided at predetermined intervals and a connecting portion connecting the top portions to each other. Each of the connecting portions is recessed in an arc shape toward the inner peripheral side of the screw portion. Further, in this configuration, the thread of the threaded portion is formed of a plurality of tops provided at predetermined intervals and a connecting portion that connects these tops to each other, and each connecting portion has an inner circumference of the threaded portion. Since the recess is formed in an arc shape toward the side, a plurality of corners having the apex at the apex are formed on the thread. In addition, the internal angle formed by the provisional straight line in contact with the arc-shaped curve that is recessed toward the inner peripheral side of the two adjacent connecting parts at this corner is that the external shape of the screw thread is the conventional triangular shape or hexagonal shape. The inner angle formed by the straight line of two adjacent connecting portions at the corner portion of the object or the inner angle formed by the tentative straight line in contact with the arc-shaped connecting portion bulging to the outer peripheral side becomes an acute angle.
【０００９】請求項２記載のタッピンねじは、請求項１
記載のタッピンねじにおいて、ねじ部の軸方向から見た
ねじ山の外形形状は、八角形状をなすものである。そし
て、この構成では、ねじ山の外形形状が従来の三角形状
のものあるいは六角形状のものに比べて、ねじ山がねじ
溝に噛合する部分が大きくなる。A tapping screw according to a second aspect is the first aspect.
In the described tapping screw, the external shape of the screw thread viewed from the axial direction of the screw portion is an octagonal shape. Further, in this configuration, the portion where the screw thread meshes with the screw groove becomes larger than that of the conventional triangular or hexagonal external shape of the screw thread.
【００１０】[0010]
【発明の実施の形態】以下、本発明のタッピンねじの一
実施の形態について、図面を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a tapping screw of the present invention will be described below with reference to the drawings.
【００１１】図１において、11はタッピンねじとしての
六角ボルトで、この六角ボルト11は、円筒軸状の外周面
にねじ山12を形成したねじ部14と、六角柱状の頭部15と
から構成され、ねじ部14と頭部15とは、首下丸み部16を
介して連接され、ねじ部14には、１条のねじ山12が連続
して形成されているとともに、先端部にはねじ山12のな
いねじ先部17が形成されている。In FIG. 1, 11 is a hexagon bolt as a tapping screw, and this hexagon bolt 11 is composed of a screw portion 14 having a thread 12 formed on the outer peripheral surface of a cylindrical shaft, and a hexagonal columnar head portion 15. The threaded portion 14 and the head portion 15 are connected to each other via the rounded portion 16 under the neck, and the threaded portion 14 is continuously formed with one thread 12 and the tip portion is threaded. A screw tip 17 without the ridge 12 is formed.
【００１２】そして、このねじ山12は、図２（ａ）に示
すように、ねじ部14の軸直角断面は、略八角形状をな
し、ねじ部14の周方向に４５度間隔で頂部21が形成され
ているとともに、隣接する頂部21同士が互いに連接部22
を介して連接され、軸方向から見て、ねじ部14の外形
（輪郭）は八角形状になっている。また、この連接部22
は、ねじ部14の内周側に向かって凹設する弧状をなし、
これらの弧に内接する仮想的な円の直径Ｄ1 は、一般用
ねじの有効径寸法にほぼ等しくなるように形成されてい
る。As shown in FIG. 2 (a), the thread 12 has a substantially octagonal cross section of the threaded portion 14 at a right angle to the axis, and the tops 21 are arranged at intervals of 45 degrees in the circumferential direction of the threaded portion 14. It is formed and adjacent tops 21 are connected to each other 22
And the external shape (contour) of the screw part 14 is octagonal when viewed in the axial direction. Also, this connecting part 22
Is an arc shape recessed toward the inner peripheral side of the screw portion 14,
The diameter D 1 of an imaginary circle inscribed in these arcs is formed to be substantially equal to the effective diameter dimension of the general purpose screw.
【００１３】また、このねじ山12は、図２（ｂ）に示す
ように、隣接するフランク同士のなすねじ山の角度α
は、６０度をなしている。Further, as shown in FIG. 2B, the thread 12 has an angle α of the thread formed by adjacent flanks.
Is at 60 degrees.
【００１４】なお、本実施の形態のねじ山12は、図３ま
たは図５に示す一般用のねじのねじ山32を形成するため
に用いる一般に市販されている標準の転造ダイスを用い
て容易に形成でき、ねじ山12の谷底の直径ｄ1 について
は、図２（ａ）に示すように、ねじ部14の軸直角断面に
おける形状が真円状に形成されている。It should be noted that the thread 12 of this embodiment can be easily formed by using a standard commercially available rolling die used to form the thread 32 of the general-purpose screw shown in FIG. 3 or 5. As for the diameter d 1 of the root of the screw thread 12, as shown in FIG. 2A, the threaded portion 14 is formed into a perfect circular shape in a cross section perpendicular to the axis.
【００１５】以上は、図１による実施の形態で、ねじ部
14が全長にわたって本発明による八角形状のねじ山12を
具備する六角ボルト11の例であるが、その他の実施の形
態としては、本発明のねじ山12が標準のねじ転造ダイス
を用いて形成することができるため、例えば、図３に示
す六角ボルト31のように、ねじ部14の先端側の約半分の
部分に、本発明による八角形状のねじ山12を形成し、残
りの約半分の部分に、外形が真円状をなす一般用のねじ
山32を連続して形成することができる。The above is the embodiment of FIG.
14 is an example of a hexagonal bolt 11 having octagonal threads 12 according to the present invention over the entire length, but in another embodiment, the threads 12 of the present invention are formed using a standard thread rolling die. Therefore, for example, like the hexagon bolt 31 shown in FIG. 3, the octagonal thread 12 according to the present invention is formed in about half of the front end side of the screw portion 14, and the remaining half of A general-purpose screw thread 32 having a perfect circular outer shape can be continuously formed on the portion.
【００１６】また、その他の実施の形態として、例え
ば、図４および図５に示すように、本発明を、頭部34に
十字形の溝35を形成したタッピンねじとしての小ねじ3
6，38に用いることもできる。そして、図４は、本発明
による八角形状のねじ山12を、ねじ部14の全長にわたっ
て具備した十字穴付き小ねじ36の例で、図５は、本発明
の八角形状のねじ山12を、ねじ部14の先端側の約半分の
部分に具備させた十字穴付き小ねじ38の例である。As another embodiment, for example, as shown in FIGS. 4 and 5, the present invention provides a machine screw 3 as a tapping screw in which a cross-shaped groove 35 is formed in a head 34.
It can also be used for 6, 38. 4 shows an example of a machine screw 36 with a cross hole having the octagonal thread 12 according to the present invention over the entire length of the screw portion 14, and FIG. 5 shows the octagonal thread 12 according to the present invention. This is an example of a machine screw 38 with a cross hole provided in about half of the front end side of the screw portion 14.
【００１７】なお、ねじ山12を備えたタッピンねじは、
鋼線を用い、頭部15，34を形成後、ねじ部14を転造にて
形成し、その後一般的には、浸炭焼入れ焼戻しを行い、
表面処理を施して製造されている。特に、締付けの相手
部材がプラスチックのような軟質材の場合には、浸炭焼
入れ焼戻しなどの熱処理を行わずに用いても、戻しトル
クを大きくできるとともに、ねじ込みトルクを小さくし
て、良好な特性を得ることができる。The tapping screw provided with the thread 12 is
Using steel wire, after forming the head portions 15 and 34, the threaded portion 14 is formed by rolling, and then, generally, carburizing and tempering is performed,
It is manufactured with a surface treatment. In particular, when the tightening member is a soft material such as plastic, the return torque can be increased and the screwing torque can be reduced without using heat treatment such as carburizing, quenching and tempering to obtain good characteristics. Obtainable.
【００１８】さらに、ねじ山12は、一般に市販されてい
る標準転造ダイスを用いて容易に形成できるため、製造
コストの上昇を抑制することができ、特に、この効果
は、図３および図５に示すように、ねじ部14の一部に八
角形状のねじ山12を形成した実施の形態に対して顕著で
ある。Further, since the screw thread 12 can be easily formed by using a standard rolling die which is generally commercially available, it is possible to suppress an increase in the manufacturing cost. In particular, this effect is shown in FIG. 3 and FIG. As shown in, it is remarkable with respect to the embodiment in which the octagonal thread 12 is formed in a part of the screw portion 14.
【００１９】[0019]
【発明の効果】請求項１記載のタッピンねじによれば、
ねじ部のねじ山の頂部の内角が、従来のタッピンねじに
比べて鋭角になるので、ねじ込みトルクが小さくなり、
作業性を向上できるとともに、ねじ山の頂部がねじ込ん
だ部材に食い込みやすくなり、ねじ戻しトルクを高くし
て、部材にねじ込んだタッピンねじを緩み難くすること
ができる。According to the tapping screw of claim 1,
The internal angle at the top of the thread of the thread becomes sharper than that of the conventional tapping screw, so the screwing torque becomes smaller,
The workability can be improved, the top of the screw thread can easily bite into the screwed member, the screw return torque can be increased, and the tapping screw screwed into the member can be made difficult to loosen.
【００２０】請求項２記載のタッピンねじによれば、請
求項１記載の効果に加え、ねじ山の外形形状を八角形状
としたため、ねじ山が部材のねじ溝に噛合する部分が、
従来の三角形状あるいは四角形状のねじ山より大きく、
締結力を高くすることができ、部材にねじ込んだタッピ
ンねじを緩み難くすることができる。そこで、ねじ込み
トルク、ねじ戻しトルク、および締結力を適切に両立さ
せることができる。According to the tapping screw of the second aspect, in addition to the effect of the first aspect, since the external shape of the screw thread is octagonal, the portion where the screw thread meshes with the thread groove of the member is
Larger than conventional triangular or quadrangular threads,
The fastening force can be increased, and the tapping screw screwed into the member can be made difficult to loosen. Therefore, the screwing torque, the screw returning torque, and the fastening force can be appropriately made compatible.
【図１】本発明のタッピンねじの一実施の形態を示す説
明図である。 （ａ）は側面図 （ｂ）は軸方向から見た端面図FIG. 1 is an explanatory view showing an embodiment of a tapping screw of the present invention. (A) is a side view (b) is an end view as seen from the axial direction
【図２】同上タッピンねじのねじ部の説明図である。 （ａ）は軸直角の断面図 （ｂ）は図２（ａ）における軸方向に沿ったＡ−Ａ断面
図FIG. 2 is an explanatory view of a thread portion of the tapping screw of the above. 2A is a cross-sectional view perpendicular to the axis, and FIG. 2B is a cross-sectional view taken along the line AA in the axial direction in FIG.
【図３】本発明の他の実施の形態を示すタッピンねじの
説明図である。 （ａ）は側面図 （ｂ）は軸方向から見た端面図FIG. 3 is an explanatory diagram of a tapping screw showing another embodiment of the present invention. (A) is a side view (b) is an end view as seen from the axial direction
【図４】本発明の他の実施の形態を示すタッピンねじの
説明図である。 （ａ）は側面図 （ｂ）は軸方向から見た端面図FIG. 4 is an explanatory diagram of a tapping screw showing another embodiment of the present invention. (A) is a side view (b) is an end view as seen from the axial direction
【図５】本発明の他の実施の形態を示すタッピンねじの
説明図である。 （ａ）は側面図 （ｂ）は軸方向から見た端面図FIG. 5 is an explanatory diagram of a tapping screw showing another embodiment of the present invention. (A) is a side view (b) is an end view as seen from the axial direction
11，31 タッピンねじとしての六角ボルト 12 ねじ山 14 ねじ部 21 頂部 22 連接部 36，38 タッピンねじとしての小ねじ 11, 31 Hexagon bolt as tapping screw 12 Thread 14 Threaded portion 21 Top 22 Connecting portion 36, 38 Machine screw as tapping screw
Claims (2)
これら頂部を互いに連接する連接部とを有するねじ山を
形成したねじ部を備え、 前記各連接部は、それぞれ前記ねじ部の内周側に向かっ
て弧状に凹設されたことを特徴とするタッピンねじ。1. A plurality of tops provided at predetermined intervals,
A tapping portion formed with a thread having a connecting portion connecting the tops to each other, wherein each connecting portion is recessed in an arc shape toward the inner peripheral side of the screw portion. screw.
状は、八角形状をなすことを特徴とする請求項１記載の
タッピンねじ。2. The tapping screw according to claim 1, wherein the external shape of the thread viewed from the axial direction of the threaded portion is octagonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7209792A JP3059362B2 (en) | 1995-08-17 | 1995-08-17 | Tapping screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7209792A JP3059362B2 (en) | 1995-08-17 | 1995-08-17 | Tapping screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0953620A true JPH0953620A (en) | 1997-02-25 |
| JP3059362B2 JP3059362B2 (en) | 2000-07-04 |
Family
ID=16578674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7209792A Expired - Fee Related JP3059362B2 (en) | 1995-08-17 | 1995-08-17 | Tapping screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3059362B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1180609A1 (en) * | 2000-08-16 | 2002-02-20 | Tai-Ping Hsu | Screw having a screw thread formed with concave facets |
| KR20040023184A (en) * | 2002-09-11 | 2004-03-18 | 현대모비스 주식회사 | Taping Screw |
| JP2005530106A (en) * | 2002-06-18 | 2005-10-06 | ギュンター ホンメル | Screw connection mechanism |
| CN102603353A (en) * | 2012-03-16 | 2012-07-25 | 南京信息工程大学 | Foaming agent for foam concrete, and preparation method and application of foaming agent |
-
1995
- 1995-08-17 JP JP7209792A patent/JP3059362B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1180609A1 (en) * | 2000-08-16 | 2002-02-20 | Tai-Ping Hsu | Screw having a screw thread formed with concave facets |
| JP2005530106A (en) * | 2002-06-18 | 2005-10-06 | ギュンター ホンメル | Screw connection mechanism |
| KR20040023184A (en) * | 2002-09-11 | 2004-03-18 | 현대모비스 주식회사 | Taping Screw |
| CN102603353A (en) * | 2012-03-16 | 2012-07-25 | 南京信息工程大学 | Foaming agent for foam concrete, and preparation method and application of foaming agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3059362B2 (en) | 2000-07-04 |
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