WO2013098964A1 - Low-head screw - Google Patents

Low-head screw Download PDF

Info

Publication number
WO2013098964A1
WO2013098964A1 PCT/JP2011/080308 JP2011080308W WO2013098964A1 WO 2013098964 A1 WO2013098964 A1 WO 2013098964A1 JP 2011080308 W JP2011080308 W JP 2011080308W WO 2013098964 A1 WO2013098964 A1 WO 2013098964A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
low
angle
head screw
screw
Prior art date
Application number
PCT/JP2011/080308
Other languages
French (fr)
Japanese (ja)
Inventor
慎悟 鳥居
尚樹 西村
古和田　欣也
Original Assignee
日東精工株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日東精工株式会社 filed Critical 日東精工株式会社
Priority to PCT/JP2011/080308 priority Critical patent/WO2013098964A1/en
Publication of WO2013098964A1 publication Critical patent/WO2013098964A1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F16B23/0023—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially cross-shaped

Definitions

  • the present invention relates to a low head screw formed with a thin screw head.
  • Patent Document 1 As a typical low head screw, there is one shown in Patent Document 1.
  • This low head screw includes a taper-shaped reinforcing portion extending from the seat surface of the head to the leg, and is configured so that the head does not break by increasing the strength under the neck.
  • the head of the low head screw is thin, it is warped by the axial force acting on the low head screw after sitting. For this reason, the drive hole is also deformed as the head warps, and there is a problem that the drive hole cannot be removed from the driver bit.
  • An object of the present invention is to provide a low-head screw in which a drive hole is prevented from being deformed by warping deformation of the head.
  • It has a head formed with a drive hole and a taper-shaped reinforcing part extending from the seating surface of the head to the leg part, and the angle formed by the seating surface of the head and the taper peripheral surface of the reinforcing part is ⁇ ,
  • the low head screw configured to satisfy the relationship ⁇ ⁇ ⁇ / 2, where ⁇ is the angle formed by the virtual line L1 extending from the apex P of the angle ⁇ to the opening end Q of the drive hole with respect to the seating surface
  • the opening end Q of the drive hole is set closer to the center side of the head 2 than the intersection of the bisector of the angle ⁇ and the head surface. It does not deform because it is not affected by the warping deformation of the head that occurs after sitting. For this reason, since the fitting property between the drive hole and the driver bit is not impaired, the utility value of the low head screw is further increased.
  • the low-head screw 1 is composed of a head 2 set to a thickness of 0.2 mm or less and a leg 3 on which a thread 4 is formed on the peripheral surface. Further, a taper-shaped reinforcing portion 6 extending from the seating surface 5 of the head 2 to the leg 3 is formed to reinforce the neck under the head 2.
  • a cross hole 7 which is an example of a drive hole is formed on the head 2, and a bottom surface 8 thereof is formed on a slope.
  • the inclination angle is set to 26 ° in accordance with Japanese Industrial Standard (JIS).
  • the inclination angle of the bottom surface 8 may be set to a value larger than 26 °. According to this setting, in the fitting of the cross hole 7 and the driver bit (not shown), the contact area is increased and the torque transmission performance is improved. Therefore, the cross hole 7 formed in the head 2 having a small thickness is used. Even if there is, it becomes hard to be crushed.
  • the low head screw 1 of the present invention has an angle formed by the seat surface 5 of the head 2 and the tapered peripheral surface of the reinforcing portion 6, and the maximum of the cross hole 7 from the apex P of the angle ⁇
  • An angle formed by an imaginary line L1 (dashed line) extending to the opening end Q on the diameter with respect to the seating surface 5 is ⁇ , and a relationship of ⁇ ⁇ ⁇ / 2 is established. That is, the open end Q of the cross hole 7 is set closer to the center of the head 2 than the intersection R between the bisector L2 of the angle ⁇ and the surface of the head 2.
  • the warping of the head 2 is between the intersection points PR on the bisector L2 (two-dot chain line). Rather than on the outer peripheral side of the head 2. Therefore, in the low head screw 1 of the present invention, the cross hole 7 is not deformed because it is not affected by the warp of the head 2 by the configuration in which the relational expression ( ⁇ ⁇ ⁇ / 2) is established.
  • the outer diameter of the head 2 is set larger than Japanese Industrial Standard. For this reason, the maximum tightening torque is increased, the tightening work is facilitated, the area of the seating surface is increased, and the loosening prevention effect is improved.
  • the low head screw 1 has a thickness h of the head 2, a blade length m of the cross hole 7, a diameter ⁇ E of the reinforcing portion 6, a height a of the reinforcing portion 6, an angle ⁇ , an angle ⁇ , according to the nominal diameter ⁇ M. Is set as shown in Table 1.
  • the thickness h of the head 2 is set in a range where the intersection point Q is not located outside the intersection point P.
  • FIG. 2 is a sectional view taken along line AA in FIG. 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moving Of Heads (AREA)

Abstract

[Problem] To provide a low-head screw that prevents deformation of a drive recess with respect to warping of a head caused by mounting. [Solution] A low-head screw (1) configured so that the relationship β≤α/2 holds true, where α is the angle formed by the bearing surface (5) of a head (2) and the taper peripheral surface of a reinforcer (6), and β is the angle formed by an imaginary line (L1) extending toward the opening end (Q) of the drive recess (7) from the vertex (P) of the angle α, with respect to the bearing surface (5). In other words, the opening end (Q) of a cross recess (7) is set closer to the center of the head (2) than the intersection (R) between a bisector (L2) of the angle α and the surface of the head (2). For this reason, the cross recess (7) is not affected, and hence not deformed, by warping of the head (2) that arises closer to the outer periphery of the head (2) than between intersections (P-R) on the bisector (L2) (two-dot chain line).

Description

低頭ねじLow head screw
　本発明は、ねじ頭部の厚みが薄く成形されている低頭ねじに関する。 The present invention relates to a low head screw formed with a thin screw head.
　近年は、製品の小型化に伴って低頭ねじの需要が高まっている。代表的な低頭ねじとしては、特許文献１に示すものがある。この低頭ねじは、頭部の座面から脚部へ至るテーパ形状の補強部を備えており、首下の強度を増すことで頭部が破断しないように構成してある。 In recent years, the demand for low head screws has increased with the miniaturization of products. As a typical low head screw, there is one shown in Patent Document 1. This low head screw includes a taper-shaped reinforcing portion extending from the seat surface of the head to the leg, and is configured so that the head does not break by increasing the strength under the neck.
特許第４２１３８４２号公報Japanese Patent No. 4213842
　ところが、低頭ねじの頭部は、厚みが薄く成形されているので、着座後に低頭ねじに作用する軸力によって反る。このため、頭部の反りに伴って駆動穴も変形してしまうので、駆動穴がドライバビットから抜けなくなる問題があった。 However, since the head of the low head screw is thin, it is warped by the axial force acting on the low head screw after sitting. For this reason, the drive hole is also deformed as the head warps, and there is a problem that the drive hole cannot be removed from the driver bit.
　本発明は、頭部の反り変形に対して駆動穴が変形しないようにした低頭ねじを提供することを目的とする。 An object of the present invention is to provide a low-head screw in which a drive hole is prevented from being deformed by warping deformation of the head.
　駆動穴が形成された頭部と、頭部の座面から脚部へ至るテーパ形状の補強部とを備えており、頭部の座面と補強部のテーパ周面とが成す角をα、当該角αの頂点Ｐから駆動穴の開口端Ｑへ延びる仮想線Ｌ１が座面に対して成す角をβとして、β≦α／２の関係が成り立つように構成されている低頭ねじによって、上記課題を解決することができる。 It has a head formed with a drive hole and a taper-shaped reinforcing part extending from the seating surface of the head to the leg part, and the angle formed by the seating surface of the head and the taper peripheral surface of the reinforcing part is α, With the low head screw configured to satisfy the relationship β ≦ α / 2, where β is the angle formed by the virtual line L1 extending from the apex P of the angle α to the opening end Q of the drive hole with respect to the seating surface, The problem can be solved.
　本発明の低頭ねじによれば、駆動穴の開口端Ｑが、角αの二等分線と頭部表面との交点よりも、頭部２の中心側に設定されるので、駆動穴は、着座後に起こる頭部の反り変形による影響を受けないので変形しない。このため、駆動穴とドライバビットとの嵌合性が損なわれることもないので、低頭ねじの利用価値が益々高まる。 According to the low head screw of the present invention, the opening end Q of the drive hole is set closer to the center side of the head 2 than the intersection of the bisector of the angle α and the head surface. It does not deform because it is not affected by the warping deformation of the head that occurs after sitting. For this reason, since the fitting property between the drive hole and the driver bit is not impaired, the utility value of the low head screw is further increased.
　以下、本発明の実施形態を図に基づいて説明する。図１及び図２は、本発明の低頭ねじ１を示す。この低頭ねじ１は、０．２ｍｍ以下の厚みに設定される頭部２と、周面にねじ山４が成形される脚部３とから構成されている。また、この頭部２の座面５から脚部３へ至るテーパ形状の補強部６が成形されており、頭部２の首下を補強している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a low head screw 1 of the present invention. The low-head screw 1 is composed of a head 2 set to a thickness of 0.2 mm or less and a leg 3 on which a thread 4 is formed on the peripheral surface. Further, a taper-shaped reinforcing portion 6 extending from the seating surface 5 of the head 2 to the leg 3 is formed to reinforce the neck under the head 2.
　前記頭部２には、駆動穴の一例である十字穴７が成形されており、その底面８は、斜面に成形されている。その傾斜角度は、日本工業規格（ＪＩＳ）に準じて、２６°に設定されている。 A cross hole 7 which is an example of a drive hole is formed on the head 2, and a bottom surface 8 thereof is formed on a slope. The inclination angle is set to 26 ° in accordance with Japanese Industrial Standard (JIS).
　なお、前記底面８の傾斜角度は、２６°よりも大きい値に設定してもよい。この設定によれば、十字穴７とドライバビット（図示せず）の嵌合において、接触面積が大きくなるためトルクの伝達性能が向上するので、厚みの小さい頭部２に成形した十字穴７であっても潰れにくくなる。 Note that the inclination angle of the bottom surface 8 may be set to a value larger than 26 °. According to this setting, in the fitting of the cross hole 7 and the driver bit (not shown), the contact area is increased and the torque transmission performance is improved. Therefore, the cross hole 7 formed in the head 2 having a small thickness is used. Even if there is, it becomes hard to be crushed.
　図２に示すように、本発明の低頭ねじ１は、前記頭部２の座面５と補強部６のテーパ周面とが成す角をα、当該角αの頂点Ｐから十字穴７の最大径上にある開口端Ｑへ延びる仮想線Ｌ１（一点鎖線）が座面５に対して成す角をβとして、β≦α／２の関係が成り立つように構成されている。つまり、十字穴７の開口端Ｑが、角αの二等分線Ｌ２と頭部２の表面との交点Ｒよりも、頭部２の中心側に設定される。着座後に低頭ねじ１に作用する軸力により、頭部２には曲げモーメントＦが発生するため、頭部２の反りは、前記二等分線Ｌ２（二点鎖線）上の交点Ｐ－Ｒ間よりも頭部２の外周側で生じる。そこで、本発明の低頭ねじ１においては、前記関係式（β≦α／２）が成立する構成により、十字穴７は、頭部２の反りに対する影響を受けないので変形しない。 As shown in FIG. 2, the low head screw 1 of the present invention has an angle formed by the seat surface 5 of the head 2 and the tapered peripheral surface of the reinforcing portion 6, and the maximum of the cross hole 7 from the apex P of the angle α An angle formed by an imaginary line L1 (dashed line) extending to the opening end Q on the diameter with respect to the seating surface 5 is β, and a relationship of β ≦ α / 2 is established. That is, the open end Q of the cross hole 7 is set closer to the center of the head 2 than the intersection R between the bisector L2 of the angle α and the surface of the head 2. Since the bending moment F is generated in the head 2 due to the axial force acting on the low head screw 1 after sitting, the warping of the head 2 is between the intersection points PR on the bisector L2 (two-dot chain line). Rather than on the outer peripheral side of the head 2. Therefore, in the low head screw 1 of the present invention, the cross hole 7 is not deformed because it is not affected by the warp of the head 2 by the configuration in which the relational expression (β ≦ α / 2) is established.
　また、前記頭部２の外径は、日本工業規格より大きく設定されている。このため、最大締め付けトルクが上昇し、締め付け作業が容易になるとともに、座面の面積が増加し、緩み止め効果も向上する。 Also, the outer diameter of the head 2 is set larger than Japanese Industrial Standard. For this reason, the maximum tightening torque is increased, the tightening work is facilitated, the area of the seating surface is increased, and the loosening prevention effect is improved.
　上記低頭ねじ１は、呼び径ΦＭに応じて、頭部２の厚みｈ、十字穴７の翼長さｍ、補強部６の直径ΦＥ、補強部６の高さａ、角α、角β、を表１のように設定する。
Figure JPOXMLDOC01-appb-T000001
 The low head screw 1 has a thickness h of the head 2, a blade length m of the cross hole 7, a diameter ΦE of the reinforcing portion 6, a height a of the reinforcing portion 6, an angle α, an angle β, according to the nominal diameter ΦM. Is set as shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
　なお、上記頭部２の厚みｈの増加に伴って、交点Ｑは頭部２の外周側に移動する。そこで、頭部２の厚みｈは、交点Ｑが交点Ｐよりも外側に位置しない範囲で設定する。 Note that the intersection point Q moves to the outer peripheral side of the head 2 as the thickness h of the head 2 increases. Therefore, the thickness h of the head 2 is set in a range where the intersection point Q is not located outside the intersection point P.
本発明の低頭ねじの平面図である。It is a top view of the low head screw of the present invention. 図１のＡ－Ａ線断面図である。FIG. 2 is a sectional view taken along line AA in FIG. 1.
　　１　低頭ねじ
　　２　頭部
　　３　脚部
　　４　ねじ山
　　５　座面
　　６　補強部
　　７　十字穴（駆動穴）
　　８　底面 1 Low head screw 2 Head 3 Leg 4 Screw thread 5 Seat 6 Reinforcement 7 Cross hole (drive hole)
8 Bottom

Claims (1)

  1. 　駆動穴が形成された頭部と、頭部の座面から脚部へ至るテーパ形状の補強部とを備える低頭ねじにおいて、
    　頭部の座面と補強部のテーパ周面とが成す角をα、当該角αの頂点Ｐから駆動穴の開口端Ｑへ延びる仮想線Ｌ１が座面に対して成す角をβとして、β≦α／２の関係が成り立つように構成されていることを特徴とする低頭ねじ。     In a low head screw comprising a head in which a drive hole is formed and a taper-shaped reinforcing portion extending from the seating surface of the head to the leg,
    The angle formed by the seating surface of the head and the tapered peripheral surface of the reinforcing portion is α, and the angle formed by the virtual line L1 extending from the apex P of the angle α to the opening end Q of the drive hole with respect to the seating surface is β. A low head screw characterized in that a relationship of ≦ α / 2 is established.
PCT/JP2011/080308 2011-12-27 2011-12-27 Low-head screw WO2013098964A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/080308 WO2013098964A1 (en) 2011-12-27 2011-12-27 Low-head screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/080308 WO2013098964A1 (en) 2011-12-27 2011-12-27 Low-head screw

Publications (1)

Publication Number Publication Date
WO2013098964A1 true WO2013098964A1 (en) 2013-07-04

Family

ID=48696529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/080308 WO2013098964A1 (en) 2011-12-27 2011-12-27 Low-head screw

Country Status (1)

Country Link
WO (1) WO2013098964A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002139010A (en) * 2000-10-31 2002-05-17 Nitto Seiko Co Ltd Screw with thin head
JP3143614U (en) * 2008-05-19 2008-07-31 アオイネオン株式会社 Composite plate fixing screw

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002139010A (en) * 2000-10-31 2002-05-17 Nitto Seiko Co Ltd Screw with thin head
JP3143614U (en) * 2008-05-19 2008-07-31 アオイネオン株式会社 Composite plate fixing screw

Similar Documents

Publication Publication Date Title
EP1824628B2 (en) Insert tip
AU2011369187B2 (en) Tapping screw
US8783497B2 (en) Filler plug for hydraulic device
US7950888B2 (en) Self-penetrating screw
CN101395391A (en) Threaded fastener shaft having a deformable threaded portion
JP5655208B2 (en) Seizure prevention bolt
US9616507B2 (en) Replaceable head cutting tool
JP4340103B2 (en) Screw fastening structure
JP2006329254A (en) Double threaded wood screw
WO2013098964A1 (en) Low-head screw
JP2005226788A (en) Pierce nut
JP4490358B2 (en) Tapping screw
JP2011148044A (en) Thread forming tap for thin material
JP2007321930A (en) Tapping screw for fastening sheet
JP2004332750A (en) Effective diameter displacement screw
JP2007205553A (en) Screw part and tightening tool
JP2002139010A (en) Screw with thin head
JP2006118582A (en) Female screw part
WO2015141854A1 (en) Self-tapping screw and fastening structure
US20210115964A1 (en) Washer
JP2011115923A (en) Tool holder
US20150104270A1 (en) Fastener for aircraft structures
KR102185997B1 (en) Taping Screw
US20060263157A1 (en) Carbide extension rod for use of processing tools
JP2006118691A (en) Fastening part and fastening method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11878843

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11878843

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 11878843

Country of ref document: EP

Kind code of ref document: A1