JP2016133148A

JP2016133148A - Fastening structure

Info

Publication number: JP2016133148A
Application number: JP2015007049A
Authority: JP
Inventors: 裕道脇; Yutaka Michiwaki
Original assignee: Nejilaw Inc
Current assignee: Nejilaw Inc
Priority date: 2015-01-16
Filing date: 2015-01-16
Publication date: 2016-07-25

Abstract

PROBLEM TO BE SOLVED: To simply carry out the enforced releasing of a fastening state.SOLUTION: A fastening structure 1 has a shaft portion 40, and an expanding portion 20 expanding in a diametrical direction to the shaft portion 40, and makes a seat surface 50 on the shaft portion 40 side in the expanding portion 20 abut on a fastened member H to fasten the fastened member H. The seat surface 50 has a recessed portion 52 disposed so as to surround a peripheral wall 46, near a part intersecting the peripheral wall 46 of the shaft portion 40.SELECTED DRAWING: Figure 1

Description

本発明は、拡張部と軸部を有して、被締結部材を締結する締結構造等に関する。 The present invention relates to a fastening structure or the like that has an extension portion and a shaft portion and fastens a member to be fastened.

被締結部材を締結するために、様々な締結構造が用いられる。代表的な締結構造は、雄ねじ体や雌ねじ体等のねじ締結体を用いる締結構造である。雄ねじ体は、ねじ部が形成される軸部と、軸部に対して径方向に拡張する拡張部（頭部）とを有する。例えば、頭部の軸方向垂直断面は六角形状となり、頭部にスパナ（オープンエンドレンチ）を係合させて強制的に回転させることで、頭部の座面を被締結部材に当接させて被締結部材の締結やその解除を行う。 Various fastening structures are used to fasten the fastened member. A typical fastening structure is a fastening structure using a screw fastening body such as a male screw body or a female screw body. The male screw body has a shaft portion on which a screw portion is formed, and an expansion portion (head) that expands in the radial direction with respect to the shaft portion. For example, the vertical cross section of the head in the axial direction is hexagonal, and the head is brought into contact with the member to be fastened by engaging a spanner (open end wrench) with the head and forcibly rotating it. The fastening member is fastened or released.

雌ねじ体は、雄ねじ体の軸部と螺合する。従って、雄ねじ体は、それ自体が軸部に対して径方向に拡張する拡張部となって、座面を被締結部材に当接させることで、被締結部材の締結や解除を行う。 The female screw body is screwed with the shaft portion of the male screw body. Therefore, the male screw body itself becomes an extended portion that expands in the radial direction with respect to the shaft portion, and the fastening member is fastened or released by bringing the seating surface into contact with the fastened member.

ねじ締結体以外にも、例えば、拡張部（頭部）と軸部を一体的に有する締結体の先端に対して、スナップピンやＣ型止め輪等の係合部材を嵌め、この係合部材を被締結部材と係合させることによって、被締結体を締結することもできる。即ち、軸部に雄ねじ部を形成しなくても、何らかの係合構造によって脱落しない状態を形成できれば、被締結部材を締結できる。拡張部（頭部）と軸部を有する釘体を、被締結部材に打ち込むことで、被締結部材に対する締結を実現することもできる。この他、リベット等でも被締結部材を、拡張部と軸部によって締結することができる。 In addition to the screw fastening body, for example, an engagement member such as a snap pin or a C-type retaining ring is fitted to the distal end of the fastening body integrally having an extension portion (head) and a shaft portion. The to-be-fastened body can also be fastened by engaging the to-be-fastened member. That is, even if the male thread portion is not formed on the shaft portion, the fastened member can be fastened if a state where it does not fall off due to some engagement structure can be formed. Fastening with respect to a to-be-fastened member is also realizable by driving into a to-be-fastened member the nail body which has an expansion part (head) and a shaft part. In addition, the member to be fastened can be fastened by the expansion portion and the shaft portion even with a rivet or the like.

日本工業規格ＪＩＳＢ１１８０六角ボルトJapanese Industrial Standard JIS B 1180 Hexagon Bolt 日本工業規格ＪＩＳＢ１１７６六角穴付ボルトJapanese Industrial Standard JIS B 1176 Hexagon socket head cap screw

締結構造は、必要に応じて締結状態を解除する必要がある。その際、何らかの理由で、締結状態が解除できなくなる事態も生じ得るが、このような場合は、締結構造を分断・破壊して強制的に解除する。 The fastening structure needs to be released from the fastening state as necessary. At that time, there may be a situation where the fastening state cannot be released for some reason. In such a case, the fastening structure is divided and destroyed to forcibly release it.

例えば、ねじ体を利用した締結構造において、雄ねじ体と雌ねじ体が錆びついて相対回転ができない場合は、雄ねじ体又は雌ねじ体の一部を分断・破壊して強制的に解除する。 For example, in a fastening structure using a screw body, when the male screw body and the female screw body are rusted and cannot be rotated relative to each other, the male screw body or a part of the female screw body is parted and broken to be forcibly released.

また、雄ねじ体や雌ねじ体に対して逆回転防止構造を適用することにより、一旦お互いを締結したら、その後は決して緩まない締結構造も存在する。このような締結構造において、何らかの事情で締結状態を解除しなければならい場合は、雄ねじ体又は雌ねじ体の一部を分断・破壊する必要が生じ得る。 In addition, there is a fastening structure in which a reverse rotation preventing structure is applied to the male screw body and the female screw body, and once they are fastened together, they are never loosened thereafter. In such a fastening structure, when it is necessary to release the fastening state for some reason, it may be necessary to divide and destroy a part of the male screw body or the female screw body.

しかしながら、雄ねじ体や雌ねじ体の分断・破壊は容易ではない。なぜなら、雄ねじ体の頭部や雌ねじ体等の拡張部における座面が被締結体に密着している状態のまま、サンダやボルトカッタ等を用いて、拡張部を切り落としたとしても、隣接する被締結部材が邪魔となり、拡張部における座面近傍が、被締結部材側に残存するからである。 However, it is not easy to divide and destroy the male screw body and the female screw body. This is because even if the extension portion is cut off using a sander or a bolt cutter while the seating surface of the extension portion such as the head of the male screw body or the female screw body is in close contact with the fastened body, This is because the fastening member becomes an obstacle and the vicinity of the seating surface in the extended portion remains on the fastened member side.

締結構造における他の課題として、軸部が疲労によって破断することがあり、使用箇所によっては大事故につながる。この軸部の破断は、締結構造における拡張部の座面と、軸部の周壁が交わる地点から生じ易いという問題があった。 As another problem in the fastening structure, the shaft portion may break due to fatigue, leading to a major accident depending on the location of use. The breakage of the shaft portion has a problem that it easily occurs from a point where the seating surface of the extension portion in the fastening structure and the peripheral wall of the shaft portion intersect.

本発明は、上記問題点に鑑みて本発明者の鋭意研究により成されたものであり、締結構造において、締結状態の強制的な解除を容易にし、また、軸部の破断が生じ難くすることを目的とする。 The present invention has been made by the inventor's diligent research in view of the above-described problems. In the fastening structure, the fastening state can be easily forcibly released, and the shaft portion is hardly broken. With the goal.

前記目的を達成する本発明は、軸部と、前記軸部に対して径方向に拡張する拡張部を備え、前記拡張部における被締結部材側の座面を、該被締結部材に対して直接的又は間接的に当接させて該被締結部材を締結する締結構造において、前記座面は、前記軸部の周辺において、前記軸部を断続的又は連続的に囲繞するように設けられる凹部を有することを特徴とする締結構造である。 The present invention that achieves the above object includes a shaft portion and an expansion portion that expands in a radial direction with respect to the shaft portion, and the seating surface of the tightened member side of the expansion portion is directly directed to the tightened member. In the fastening structure in which the member to be fastened is brought into contact with each other in a manual or indirect manner, the seat surface has a recess provided so as to intermittently or continuously surround the shaft portion around the shaft portion. It is the fastening structure characterized by having.

前記凹部は、環状の溝であることを特徴とする。 The recess is an annular groove.

前記座面には、被締結部材との相対回転を規制する規制手段が形成されることを特徴とする。 The seating surface is formed with a restricting means for restricting relative rotation with the member to be fastened.

前記軸部は、リード角及び／又はリード方向が相異なる第一及び第二螺旋溝構造を有することを特徴とする。 The shaft portion has first and second spiral groove structures having different lead angles and / or lead directions.

前記軸部と前記拡張部が一体化されることで、釘体、鋲体又は雄ねじ体を構成することを特徴とする。 The shaft portion and the extension portion are integrated to form a nail body, a housing, or a male screw body.

前記拡張部は、雌ねじ孔を有する雌ねじ体であり、前記軸部には雄ねじ部が形成され、該拡張部の前記雌ねじ孔と前記軸部の前記雄ねじ部が螺合することを特徴とする。 The extension portion is a female screw body having a female screw hole, a male screw portion is formed on the shaft portion, and the female screw hole of the extension portion and the male screw portion of the shaft portion are screwed together.

前記座面に形成される前記凹部は、前記雌ねじ孔の内壁と連続することを特徴とする。 The recess formed in the seating surface is continuous with the inner wall of the female screw hole.

前記凹部の底部周辺の断面形状は、略湾状を成すことを特徴とする。 The cross-sectional shape around the bottom of the recess is substantially bay-shaped.

本発明によれば、締結状態の強制的な解除を簡単に行うことができる。 According to the present invention, the forcible release of the engaged state can be easily performed.

本発明の第一実施形態に係る締結構造が適用される雄ねじ体の（Ａ）上面図、（Ｂ）正面図、（Ｃ）底面図、（Ｃ）正面断面図である。It is (A) top view, (B) front view, (C) bottom view, and (C) front sectional view of the external thread body to which the fastening structure according to the first embodiment of the present invention is applied. （Ａ）乃至（Ｃ）は、同締結構造に関して締結状態を強制的に解除する手順を示す正面断面図である。(A) thru | or (C) is front sectional drawing which shows the procedure which cancels | releases a fastening state compulsorily regarding the fastening structure. （Ａ）は同締結構造が適用される雄ねじ体の応力状態を示す正面断面図であり、（Ｂ）は従来の雄ねじ体の応力状態を示す正面断面図である。(A) is front sectional drawing which shows the stress state of the external thread body to which the same fastening structure is applied, (B) is front sectional drawing which shows the stress state of the conventional external thread body. 本発明の第二実施形態に係る締結構造が適用される雌ねじ体の（Ａ）上面図、（Ｂ）正面図、（Ｃ）底面図、（Ｃ）正面断面図である。It is (A) top view, (B) front view, (C) bottom view, (C) front sectional view of the internal thread body to which the fastening structure concerning a second embodiment of the present invention is applied. （Ａ）及び（Ｂ）は、同締結構造に関して締結状態を強制的に解除する手順を示す正面断面図である。(A) And (B) is front sectional drawing which shows the procedure which cancels | releases a fastening state compulsorily regarding the fastening structure. 本発明の第三実施形態に係る締結構造が適用される雌ねじ体の（Ａ）上面図、（Ｂ）正面図、（Ｃ）底面図、（Ｃ）正面断面図である。It is the (A) top view, (B) front view, (C) bottom view, (C) front sectional view of the internal thread body to which the fastening structure concerning a third embodiment of the present invention is applied. 同締結構造が適用される回転止部材の（Ａ）上面図、（Ｂ）底面図であり、（Ｃ）乃至（Ｄ）は、同締結構造に関して締結状態を強制的に解除する手順を示す正面断面図である。It is (A) top view and (B) bottom view of a rotation stopping member to which the fastening structure is applied, and (C) to (D) are front views showing a procedure for forcibly releasing the fastening state with respect to the fastening structure. It is sectional drawing. （Ａ）は本発明の第四実施形態に係る締結構造を示す正面部分断面図であり、（Ｂ）及び（Ｃ）は、それぞれ、同締結構造が適用される雌ねじ体の上面図及び正面断面図である。(A) is a front fragmentary sectional view which shows the fastening structure which concerns on 4th embodiment of this invention, (B) and (C) are the top views and front cross sections of the internal thread body to which the said fastening structure is applied, respectively. FIG. 本発明の実施形態の他の例に係る締結構造の座面を示す底面図である。It is a bottom view which shows the seat surface of the fastening structure which concerns on the other example of embodiment of this invention.

以下、本発明の実施の形態を、添付図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１に本発明の第一実施形態に係る締結構造１を示す。この締結構造１は、所謂六角ボルトに相当する雄ねじ体１０に適用されたものであり、頭部２０と、軸部４０を備える。軸部４０は、螺旋状の雄ねじが形成されて相手側の雌ねじ（図示省略）と螺合する雄ねじ部４２と、雄ねじ部４２によりも頭部２０側に形成される円柱状の円筒部４４（慣習上、円柱状であっても円筒部と呼ばれる）から構成される。なお、円筒部４４は必須ではない。 FIG. 1 shows a fastening structure 1 according to a first embodiment of the present invention. The fastening structure 1 is applied to a male screw body 10 corresponding to a so-called hexagon bolt, and includes a head portion 20 and a shaft portion 40. The shaft portion 40 includes a male screw portion 42 in which a helical male screw is formed and screwed into a mating female screw (not shown), and a columnar cylindrical portion 44 (also formed on the head 20 side by the male screw portion 42). Conventionally, even a columnar shape is called a cylindrical portion). The cylindrical portion 44 is not essential.

頭部２０は、軸部４０よりも径方向に拡張する拡張部であって、外周面２６を備える。外周面２６は、軸方向に延びる峰部２６Ａと平面部２６Ｂから構成されており、軸方向外側の端面２４から視ると正六角形状となっている。結果、この外周面２６は、スパナと係合して締結可能となっている。なお、ここでは雄ねじ体１０として六角ボルトを例示しているが、本発明はこれに限定されず、六角穴付ボルト、頭部端面にプラス溝やマイナス溝が形成されるビス（小ねじ）など、様々な雄ねじ体に適用可能である。 The head portion 20 is an expansion portion that extends in the radial direction relative to the shaft portion 40, and includes an outer peripheral surface 26. The outer peripheral surface 26 includes a ridge portion 26 </ b> A and a flat portion 26 </ b> B extending in the axial direction, and has a regular hexagonal shape when viewed from the end surface 24 on the outer side in the axial direction. As a result, the outer peripheral surface 26 can be engaged with a spanner and fastened. In addition, although the hexagon bolt is illustrated as the male screw body 10 here, this invention is not limited to this, Hex socket head bolt, the bis | screw (small screw) in which a plus groove | channel or a minus groove | channel is formed in a head end surface, etc. Applicable to various male screw bodies.

頭部２０における軸部４０側の座面５０は、被締結部材Ｈ（図２参照）に当接する。この座面５０は、該座面５０と軸部４０の周壁４６とが交わる部位Ｐの近傍において凹部５２を有する。凹部５２は、周壁４６を取り囲むように設けられており、端面２４側に向かって窪む。また凹部５２は、軸部４０と同軸となる環状の溝となっており、径方向の断面は略湾状、例えば、略半円形状となる。このように凹部の底部周辺の断面形状を、略湾状とすることで、凹部周辺の応力を分散させ、応力集中が生じることを抑制することが好ましい。 The seating surface 50 on the shaft portion 40 side of the head 20 abuts on the fastened member H (see FIG. 2). The seat surface 50 has a recess 52 in the vicinity of a portion P where the seat surface 50 and the peripheral wall 46 of the shaft portion 40 intersect. The recess 52 is provided so as to surround the peripheral wall 46 and is recessed toward the end face 24 side. The concave portion 52 is an annular groove that is coaxial with the shaft portion 40, and the radial cross section thereof has a substantially bay shape, for example, a substantially semicircular shape. As described above, it is preferable that the cross-sectional shape around the bottom of the recess is substantially bay-shaped to disperse the stress around the recess and suppress the stress concentration.

座面５０における凹部５２が占有する場所は、座面５０における半径方向内側を主とすることが好ましい。具体的には、座面５０における半径方向の全寸をＷ、その内側半分をＷ_ｉｎ、外側半分をＷ_ｏｕｔと定義する場合に、凹部５２は、内側半分Ｗ_ｉｎ側に主として形成されるようにする。これにより、座面５０の外側半分Ｗ_ｏｕｔを環状に残して、これを被締結部材Ｈに密着させることで、互いに生じる摩擦力によって締結構造１が緩み難い状態となる。また、凹部５２を、座面５０の内側半分Ｗ_ｉｎに配置することで、凹部５２を軸直角方向に分断した際、軸部４０側に残存する頭部２０の直径を小さくする、或いは皆無にすることができる。なお、図１（Ｂ）に示すように、頭部２０の外周面２６には、凹部５２を軸直角方向に分断する断面を案内するための案内表示Ｍ（ここでは点線表示）が形成される。 The place occupied by the recess 52 in the seating surface 50 is preferably mainly on the radially inner side of the seating surface 50. Specifically, when the full size in the radial direction of the seating surface 50 is defined as W, the inner half is defined as W _in , and the outer half is defined as W _out , the recess 52 is formed mainly on the inner half W _in side. To. As a result, the outer half W _out of the seating surface 50 is left in an annular shape and is closely attached to the member H to be fastened, so that the fastening structure 1 is hardly loosened by the frictional force generated between each other. Further, by arranging the recess 52 _in the inner half Win of the seating surface 50, when the recess 52 is divided in the direction perpendicular to the axis, the diameter of the head 20 remaining on the side of the shaft 40 is reduced or eliminated. can do. As shown in FIG. 1B, a guide display M (in this case, a dotted line display) is formed on the outer peripheral surface 26 of the head 20 to guide a cross section that divides the recess 52 in the direction perpendicular to the axis. .

また本第一実施形態では、凹部５２における半径方向内側の縁（軸部４０側の縁）は、軸部４０の周壁４６とほぼ連続しており、その境界Ｑに段差ができないようになっている。このようにすると、凹部５２を径方向に分断した際、軸部４０側に残存する頭部２０の直径を、軸部４０の直径と殆ど一致させることができる。 In the first embodiment, the radially inner edge (the edge on the shaft portion 40 side) of the recess 52 is substantially continuous with the peripheral wall 46 of the shaft portion 40, so that no step can be formed at the boundary Q. Yes. In this way, when the recess 52 is divided in the radial direction, the diameter of the head portion 20 remaining on the shaft portion 40 side can be made almost coincident with the diameter of the shaft portion 40.

次に、本締結構造１の作用について説明する。 Next, the operation of the fastening structure 1 will be described.

図２（Ａ）に示すように、本締結構造１によって被締結部材Ｈを締結した後、この締結構造１を解除できない場合がある。この場合は、図２（Ｂ）に示すように、雄ねじ体１０の頭部２０を、軸直角方向の切断面を示す案内表示Ｍを参照して、それと一致する断面Ｄで切断する。この断面Ｄに沿って、サンダやカッタ等で頭部２０を切断すると、凹部５２も分断される。断面Ｄは、凹部５２の深さに相当する分だけ、被締結部材Ｈから離すことができるので、切断時に被締結部材Ｈが邪魔にならず、従って、被締結部材Ｈを損傷せずに締結構造１を離脱させることができる。切断後の頭部２０は、端面２４を含む第一部位２０ａと、凹部５２に対して半径方向外側の座面５０を含むリング状の第二部位２０ｂと、凹部５２に対して半径方向内側の領域で軸部４０と一体的に残存する第三部位２０ｃに分割される。なお、本実施形態では、凹部５２の半径方向内側の縁（軸部４０側の縁）が、軸部４０の周壁４６とほぼ連続することから、第三部位２０ｃの直径は、軸部４０の直径と近似する。 As shown in FIG. 2A, after the fastening member H is fastened by the fastening structure 1, the fastening structure 1 may not be released. In this case, as shown in FIG. 2 (B), the head 20 of the male screw body 10 is cut with a cross section D that coincides with the guide display M showing the cut surface in the direction perpendicular to the axis. When the head 20 is cut along the cross section D with a sander, a cutter, or the like, the recess 52 is also divided. Since the section D can be separated from the fastened member H by an amount corresponding to the depth of the recess 52, the fastened member H does not get in the way at the time of cutting, and therefore the fastened member H is fastened without being damaged. The structure 1 can be detached. The head 20 after cutting includes a first portion 20 a including the end surface 24, a ring-shaped second portion 20 b including a seating surface 50 radially outward with respect to the recess 52, and a radially inner side with respect to the recess 52. The region is divided into third portions 20 c that remain integrally with the shaft portion 40. In the present embodiment, since the radially inner edge (edge on the shaft portion 40 side) of the recess 52 is substantially continuous with the peripheral wall 46 of the shaft portion 40, the diameter of the third portion 20c is Approximate the diameter.

その結果、図２（Ｃ）に示すように、軸部４０及び第三部位２０ｃを、被締結部材Ｈの孔に対して、頭部２０から反対側に抜き出すことが可能となり、締結構造１による締結状態を簡単に解除することができる。 As a result, as shown in FIG. 2C, the shaft portion 40 and the third portion 20c can be extracted from the head 20 to the opposite side with respect to the hole of the fastened member H. The fastening state can be easily released.

更に図３（Ａ）に示すように、締結状態における雄ねじ体１０には、座面５０に対して被締結部材（図示省略）からの反力Ａが作用し、軸部４０には、この反力Ａに対応する軸方向張力Ｂが作用する。この雄ねじ体１０では、凹部５２の半径方向内側の縁（軸部４０側の縁）が、軸部４０の周壁４６とほぼ連続しており、その境界Ｑに段差ができないので、反力Ａ及び張力Ｂによる内部応力が、矢印Ｃに示すように凹部５２内に分散されるので、境界Ｐへの集中を低減できる。従って、締結中において、頭部２０と軸部４０が分断する破断事故を抑制できる。なお図３（Ｂ）に示す従来の雄ねじ体の場合は、矢印Ｃに示すように、境界Ｑに内部応力が局所的に集中するため、そこから亀裂等が生じ易い。 Further, as shown in FIG. 3A, a reaction force A from a member to be fastened (not shown) acts on the seat surface 50 on the male screw body 10 in the fastened state, and this reaction is exerted on the shaft portion 40. An axial tension B corresponding to the force A acts. In this male screw body 10, the radially inner edge of the recess 52 (the edge on the shaft portion 40 side) is substantially continuous with the peripheral wall 46 of the shaft portion 40, and there is no step at the boundary Q. Since the internal stress due to the tension B is dispersed in the recess 52 as indicated by the arrow C, concentration on the boundary P can be reduced. Therefore, it is possible to suppress a breakage accident in which the head 20 and the shaft 40 are divided during fastening. In the case of the conventional male screw body shown in FIG. 3B, as shown by an arrow C, the internal stress is locally concentrated on the boundary Q, so that cracks or the like are likely to occur therefrom.

次に本発明の第二実施形態に係る締結構造について説明する。 Next, the fastening structure according to the second embodiment of the present invention will be described.

図４及び図５に本発明の第二実施形態に係る締結構造１を示す。この締結構造１は、所謂六角ナットの相当する雌ねじ体６０に適用されたものであり、この雌ねじ体６０を雄ねじ体１０と螺合することによって、被締結部材Ｈを締結する（図５参照）。 4 and 5 show a fastening structure 1 according to a second embodiment of the present invention. The fastening structure 1 is applied to a female screw body 60 corresponding to a so-called hex nut, and the fastened member H is fastened by screwing the female screw body 60 with the male screw body 10 (see FIG. 5). .

雌ねじ体６０は、円筒部８０を備える。円筒部８０の内周面には、相手側の雄ねじ（図示省略）と螺合する雄ねじ部８２が形成される。 The female screw body 60 includes a cylindrical portion 80. On the inner peripheral surface of the cylindrical portion 80, a male screw portion 82 that is screwed with a mating male screw (not shown) is formed.

雌ねじ体６０の外周面７６は、軸方向に延びる峰部７６Ａと平面部７６Ｂから構成されており、軸方向外側の端面７４から視ると正六角形状となっている。結果、この外周面７６は、スパナと係合して締結可能となっている。なお、ここでは雌ねじ体６０として六角ナットを例示しているが、本発明はこれに限定されず、様々な雄ねじ体に適用可能である。 The outer peripheral surface 76 of the female screw body 60 is composed of a peak portion 76A and a flat surface portion 76B extending in the axial direction, and has a regular hexagonal shape when viewed from the end surface 74 on the outer side in the axial direction. As a result, the outer peripheral surface 76 can be engaged with a spanner and fastened. In addition, although the hexagon nut is illustrated here as the internal thread body 60, this invention is not limited to this, It is applicable to various external thread bodies.

図５（Ａ）に示すように、雌ねじ体６０は、螺合する雄ねじ体１０の軸部４０よりも径方向に拡張する拡張部となり、被締結部材Ｈ側の座面９０が被締結部材Ｈに当接する。座面９０は、該座面９０の延長線と軸部４０の周壁４６が交わる部位Ｐの近傍に凹部９２を有する。凹部９２は、周壁４６と取り囲むように配置されており、座面９０と反対側の端面７４側に向かって窪む。図４（Ｃ）に示すように、凹部９２は、雌ねじ部８２と同軸となる環状となっており、径方向の断面は湾曲形状となる。 As shown in FIG. 5 (A), the female screw body 60 becomes an extended portion that expands in the radial direction with respect to the shaft portion 40 of the male screw body 10 to be screwed, and the seating surface 90 on the fastened member H side is the fastened member H. Abut. The seating surface 90 has a recess 92 in the vicinity of a portion P where the extension line of the seating surface 90 and the peripheral wall 46 of the shaft portion 40 intersect. The recess 92 is disposed so as to surround the peripheral wall 46, and is recessed toward the end surface 74 side opposite to the seating surface 90. As shown in FIG. 4C, the concave portion 92 has an annular shape that is coaxial with the female screw portion 82, and the radial cross section has a curved shape.

図４（Ｄ）に示すように、凹部９２の半径方向内側の縁は、円筒部８０の内周面と連続する。換言すると、凹部９２の半径方向内側縁に対して、座面９０が軸方向（図４（Ｄ）の下方向）に突出する。このようにすると、凹部９２を径方向に分断した際、座面９０全体を被締結部材Ｈから離脱させることができる。 As shown in FIG. 4D, the radially inner edge of the recess 92 is continuous with the inner peripheral surface of the cylindrical portion 80. In other words, the seating surface 90 protrudes in the axial direction (downward in FIG. 4D) with respect to the radially inner edge of the recess 92. In this way, the entire seating surface 90 can be detached from the fastened member H when the recess 92 is divided in the radial direction.

図４（Ｃ）に示すように、座面９０における凹部９２が占有する場所は、座面９０における半径方向内側を主とすることが好ましい。具体的には、座面９０における半径方向の全寸をＷ、その内側半分をＷ_ｉｎ、外側半分をＷ_ｏｕｔと定義する場合に、凹部９２は、内側半分Ｗ_ｉｎ側に主として形成されるようにする。これにより、座面９０の外側半分Ｗ_ｏｕｔを環状に残し、これを被締結部材Ｈに密着させることで、互いに生じる摩擦力によって締結構造１が緩み難い状態となる。なお、図４（Ｂ）に示すように、雌ねじ体６０の外周面７６には、凹部９２を軸直角方向に分断する断面を案内するための案内表示Ｍ（ここでは点線表示）が形成される。 As shown in FIG. 4C, it is preferable that the location occupied by the recess 92 in the seating surface 90 is mainly on the radially inner side of the seating surface 90. Specifically, when the full size in the radial direction of the seating surface 90 is defined as W, the inner half is defined as W _in , and the outer half is defined as W _out , the recess 92 is formed mainly on the inner half W _in side. To. As a result, the outer half W _out of the seating surface 90 is left in an annular shape, and this is brought into close contact with the fastened member H, so that the fastening structure 1 is hardly loosened by the frictional force generated between each other. As shown in FIG. 4B, a guide display M (in this case, a dotted line display) is formed on the outer peripheral surface 76 of the female screw body 60 to guide a cross section that divides the recess 92 in the direction perpendicular to the axis. .

図５（Ａ）に示すように、本締結構造１によって被締結部材Ｈを締結した後、この締結構造１を解除できない場合がある。この場合は、図５（Ｂ）に示すように、雌ねじ体６０を、案内表示Ｍを参照して、それと一致する断面Ｄで切断する。この断面Ｄに沿って、サンダやカッタ等で雌ねじ体６０を切断すると、凹部９２も分断される。断面Ｄは、凹部９２の深さに相当する分だけ、被締結部材Ｈから離すことができるので、被締結部材Ｈが邪魔にならず、従って、被締結部材Ｈを損傷せずに済む。切断後の雌ねじ体６０は、端面７４を含む第一部位６０ａと、凹部９２に対して半径方向外側の座面９０を含むリング状の第二部位６０ｂに分割される。なお、雄ねじ体１０の軸部４０も同時に分断される。本実施形態では、凹部９２の半径方向内側の縁が、円筒部８０の内周面と連続することから、雌ねじ体６０が、切断後の雄ねじ体１０の本体側に残存しない。その結果、雄ねじ体１０を、被締結部材Ｈの孔から簡単に抜き出すことが可能となり、締結構造１による締結状態を簡単に解除することができる。 As shown in FIG. 5A, after the fastening member H is fastened by the fastening structure 1, the fastening structure 1 may not be released. In this case, as shown in FIG. 5B, the female screw body 60 is cut with a cross section D that matches the guide display M with reference to the guide display M. When the female screw body 60 is cut along the cross section D with a sander, a cutter, or the like, the concave portion 92 is also divided. Since the cross section D can be separated from the fastened member H by an amount corresponding to the depth of the recess 92, the fastened member H does not get in the way, and therefore, the fastened member H is not damaged. The internally threaded body 60 after cutting is divided into a first portion 60 a including the end surface 74 and a ring-shaped second portion 60 b including a seating surface 90 radially outside the recess 92. In addition, the axial part 40 of the external thread body 10 is also parted simultaneously. In the present embodiment, since the radially inner edge of the recess 92 is continuous with the inner peripheral surface of the cylindrical portion 80, the female screw body 60 does not remain on the main body side of the male screw body 10 after cutting. As a result, the male screw body 10 can be easily extracted from the hole of the fastened member H, and the fastening state by the fastening structure 1 can be easily released.

次に本発明の第三実施形態に係る締結構造について説明する。なお、第三実施形態は、第一実施形態と類似していることから、第一実施形態と同一又は類似する部位、部材について、図面中の符号を一致させることで説明を省略し、ここでは異なる点を中心に説明する。 Next, a fastening structure according to a third embodiment of the present invention will be described. In addition, since 3rd embodiment is similar to 1st embodiment, it abbreviate | omits description by making the code | symbol in drawing correspond about the site | part and member which are the same as or similar to 1st embodiment, and here. The difference will be mainly described.

図６及び図７に示すように、本締結構造１は、所謂六角ボルトに相当する雄ねじ体１０に適用されたものであり、更に、頭部２０と被締結部材Ｈの間に回転止部材１００が挿入されることで、雄ねじ体１０と被締結部材Ｈの相対回転を規制している。 As shown in FIGS. 6 and 7, the fastening structure 1 is applied to a male screw body 10 corresponding to a so-called hexagonal bolt, and further, a rotation stopping member 100 between the head 20 and the fastened member H. Is inserted to regulate the relative rotation of the male screw body 10 and the fastened member H.

図７（Ａ）に示すように、回転止部材１００は、貫通孔１０５に雄ねじ体１０の軸部４０が挿入される。回転止部材１００の一方面には、第一受部１０１が形成される。この第一受部１０１は、頭部２０の座面５０と対向しており、両者の間には、第一係合機構Ａが構成される（図７（Ｃ）参照）。この第一係合機構Ａは、締結状態の雄ねじ体１０を緩める方向に回転しようとすると、第一受部１０１と座面５０が互いに係合して、当該回転方向に対する第一受部１０１と座面５０との相対回転を規制する。 As shown in FIG. 7A, in the rotation stop member 100, the shaft portion 40 of the male screw body 10 is inserted into the through hole 105. A first receiving portion 101 is formed on one surface of the rotation stop member 100. The first receiving portion 101 faces the seating surface 50 of the head 20, and a first engagement mechanism A is configured between the first receiving portion 101 (see FIG. 7C). When the first engagement mechanism A attempts to rotate in the direction of loosening the male screw body 10 in the fastened state, the first receiving portion 101 and the seating surface 50 engage with each other, and the first receiving portion 101 with respect to the rotation direction The relative rotation with the seating surface 50 is restricted.

図７（Ｂ）に示すように、回転止部材１００の他方側には、第二受部１１０が形成される。この第二受部１１０は、被締結部材Ｈと対向する。 As shown in FIG. 7B, the second receiving portion 110 is formed on the other side of the rotation stop member 100. The second receiving part 110 faces the fastened member H.

図７（Ｅ）に示すように、被締結部材Ｈには、回転止部材１００の第二受部１１０に対向する係合部１５０が形成される。被締結部材Ｈの係合部１５０と、回転止部材１００の第二受部１１０の間には、第二係合機構Ｂが構成される（図７（Ｃ）参照）。この第二係合機構Ｂは、少なくとも回転止部材１００が、雄ねじ体１０と共に緩める方向に回転しようとすると、第二受部１１０と係合部１５０が互いに係合して、当該回転方向に対する第二受部１１０と係合部１５０との相対回転を防止する。 As shown in FIG. 7E, the fastened member H is formed with an engaging portion 150 that faces the second receiving portion 110 of the rotation stopping member 100. A second engagement mechanism B is configured between the engagement portion 150 of the fastened member H and the second receiving portion 110 of the rotation stopping member 100 (see FIG. 7C). In the second engagement mechanism B, when at least the rotation preventing member 100 tries to rotate in the loosening direction together with the male screw body 10, the second receiving portion 110 and the engaging portion 150 are engaged with each other, and Relative rotation between the two receiving portions 110 and the engaging portion 150 is prevented.

この第一係合機構Ａと第二係合機構Ｂの規制手段により、雄ねじ体１０が緩み方向に回転しようとすると、回転止部材１００の介在によって、雄ねじ体１０と被締結部材Ｈの相対回転が規制される。結果、雄ねじ体１０が緩むことが防止される。 When the male screw body 10 tries to rotate in the loosening direction by the restriction means of the first engagement mechanism A and the second engagement mechanism B, the relative rotation between the male screw body 10 and the fastened member H is interposed by the rotation stop member 100. Is regulated. As a result, the male screw body 10 is prevented from loosening.

図６（Ｃ）に示すように、雄ねじ体１０の座面５０には、ねじ体側凹凸５６が形成される。ねじ体側凹凸５６は、座面５０において環状領域に形成される。ねじ体側凹凸５６は、周方向に複数連続して設けられる鋸刃形状と成っている。ねじ体側凹凸５６の各々が延びる方向、即ち、稜線が延びる方向は、雄ねじ体１０の半径方向となっている。結果、ねじ体側凹凸５６は、軸心から放射状に延びる。ねじ体側凹凸５６の半径方向内側に、凹部５２が形成される。この凹部５２は、軸部４０と同軸となる環状の溝となっており、その断面は、軸方向に延びるスリット形状となる（図６（Ｄ）参照）。 As shown in FIG. 6C, screw body side irregularities 56 are formed on the seating surface 50 of the male screw body 10. The screw body side unevenness 56 is formed in an annular region on the seat surface 50. The screw body side unevenness 56 has a saw blade shape that is continuously provided in the circumferential direction. The direction in which each of the threaded body side irregularities 56 extends, that is, the direction in which the ridge line extends is the radial direction of the male threaded body 10. As a result, the screw body side unevenness 56 extends radially from the axis. A recess 52 is formed on the inner side in the radial direction of the screw body side unevenness 56. The concave portion 52 is an annular groove that is coaxial with the shaft portion 40, and the cross section thereof has a slit shape extending in the axial direction (see FIG. 6D).

図７（Ａ）に示すように、回転止部材１００の第一受部１０１には、ねじ体側凹凸５６と係合する第一受部側凹凸１０４が形成される。第一受部側凹凸１０４は、周方向に複数連続して設けられる鋸刃形状となっている。第一受部側凹凸１０４の各々が延びる方向、即ち稜線が延びる方向は、雄ねじ体１０の半径方向に沿っている。結果、第一受部側凹凸１０４は、回転止部材１００の貫通穴１０５の中心から放射状に延びる。 As shown in FIG. 7A, the first receiving portion 101 of the rotation stopping member 100 is formed with a first receiving portion side unevenness 104 that engages with the screw body side unevenness 56. The 1st receiving part side unevenness | corrugation 104 becomes the saw blade shape provided in multiple numbers by the circumferential direction continuously. The direction in which each of the first receiving portion side irregularities 104 extends, that is, the direction in which the ridge line extends, is along the radial direction of the male screw body 10. As a result, the first receiving portion side unevenness 104 extends radially from the center of the through hole 105 of the rotation stop member 100.

結果、雄ねじ体１０を締め付けると、第一係合機構Ａとして、ねじ体側凹凸５６と第一受部側凹凸１０４が係合する。両者の鋸歯形状は、雄ねじ体１０が、締結方向に回転しようとすると、互いの鋸刃の傾斜面が当接して、両者の距離を軸方向に離しながら、相対スライドを許容する。一方、雄ねじ体１０が、緩み方向に回転しようとすると、互いの垂直面（傾斜が強い側の面）が当接して、両者の相対移動を防止する。とりわけ第一係合機構Ａは、雄ねじ体１０を締め付けることによって、座面５０と第一受部１０１の距離が縮む程、ねじ体側凹凸５６と第一受部側凹凸１０４の噛み合いが強くなり、緩み方向側の係合強度が高められる。 As a result, when the male screw body 10 is tightened, the screw body side unevenness 56 and the first receiving portion side unevenness 104 are engaged as the first engagement mechanism A. When the male screw body 10 tries to rotate in the fastening direction, the saw-tooth shape of both of them allows the relative sliding while allowing the inclined surfaces of the saw blades to contact each other and separating the distance between the two in the axial direction. On the other hand, when the male screw body 10 tries to rotate in the loosening direction, the mutually perpendicular surfaces (the surfaces on the side with a strong inclination) come into contact with each other to prevent relative movement between the two. In particular, in the first engagement mechanism A, by tightening the male screw body 10, the engagement between the screw body side unevenness 56 and the first receiving portion side unevenness 104 becomes stronger as the distance between the seat surface 50 and the first receiving portion 101 decreases. The engagement strength on the loosening direction side is increased.

図７（Ｂ）に示すように、回転止部材１００の第二受部１１０の外壁１１２は、ねじの軸心（貫通穴１０５の軸心）からの距離が周方向に沿って変動する（非一定となる）。具体的に、この外壁１１２は、ねじの軸心（貫通孔１０５の中心）に対して非正円形状となっており、貫通孔１０５と非同軸（偏心）となる正円形状となる。勿論、外壁１１２形状は、偏心した正円形状に限られず、涙滴形や楕円形状、多角形状等、被締結部材Ｈの形状等に応じて適宜設定が可能である。 As shown in FIG. 7B, the outer wall 112 of the second receiving portion 110 of the rotation stopping member 100 has a distance from the axial center of the screw (the axial center of the through hole 105) that varies along the circumferential direction (non- Constant). Specifically, the outer wall 112 has a non-circular shape with respect to the axial center of the screw (the center of the through hole 105), and has a perfect circular shape that is non-coaxial (eccentric) with the through hole 105. Of course, the shape of the outer wall 112 is not limited to an eccentric circular shape, and can be appropriately set according to the shape of the fastened member H, such as a teardrop shape, an elliptical shape, or a polygonal shape.

一方、図７（Ｅ）に示すように、被締結部材Ｈの係合部１５０は、回転止部材１００の第二受部１１０を収容するための収容凹部となっており、且つ、この収容凹部の内壁１５２も、ねじの軸心に対して非正円形状となっている。この内壁１５２は、詳細に、雄ねじ体１０が挿入される挿入孔の軸心に対して非同軸となる正円形状となり、回転止部材１００の外壁１１２形状と略合同にすることが好ましい。 On the other hand, as shown in FIG. 7 (E), the engaging portion 150 of the fastened member H is a housing recess for housing the second receiving portion 110 of the rotation stop member 100, and this housing recess. The inner wall 152 is also non-circular with respect to the axial center of the screw. In detail, the inner wall 152 preferably has a perfect circular shape that is non-coaxial with respect to the axis of the insertion hole into which the male screw body 10 is inserted, and is preferably substantially congruent with the outer wall 112 shape of the rotation stop member 100.

従って、図７（Ｃ）に示すように、回転止部材１００の第二受部１１０が、被締結部材Ｈの係合部（収容凹部）１５０に収容されると、両者が嵌り合う結果となり、ねじの軸心を合わせた状態のままでは、両者の周方向の相対回転が規制される。即ち、この第二受部１１０と係合部（収容凹部）１５０が第二係合機構Ｂとして作用する。 Therefore, as shown in FIG. 7C, when the second receiving portion 110 of the rotation stopping member 100 is accommodated in the engaging portion (accommodating concave portion) 150 of the fastened member H, both result in fitting. If the axial centers of the screws are kept in alignment, relative rotation in the circumferential direction of both is restricted. That is, the second receiving portion 110 and the engaging portion (accommodating recess) 150 act as the second engaging mechanism B.

以上の通り、本第三実施形態の締結構造１によれば、回転止部材１００を介在させることによって、座面５０と第一受部１０１の間に第一係合機構Ａを構成し、係合部１５０と第二受部１１０の間に第二係合機構Ｂを構成し、雄ねじ体１０が緩もうとすると、第一係合機構Ａ及び第二係合機構Ｂの規制手段によって、雄ねじ体１０が被締結部材Ｈに対して周方向に係合した状態となり、逆回転すること、即ち緩むことが防止される。従って、振動や揺動等が生じても、全く緩まない締結状態を得ることが出来る。 As described above, according to the fastening structure 1 of the third embodiment, the first engagement mechanism A is configured between the seat surface 50 and the first receiving portion 101 by interposing the rotation stop member 100, and When the second engagement mechanism B is formed between the joint portion 150 and the second receiving portion 110 and the male screw body 10 is about to be loosened, the male screw is controlled by the restriction means of the first engagement mechanism A and the second engagement mechanism B. The body 10 is engaged with the fastened member H in the circumferential direction, and is prevented from rotating backward, that is, loosening. Therefore, it is possible to obtain a fastening state that does not loosen at all even if vibration or swinging occurs.

このような締結構造１において、締結状態を解除する場合は、図７（Ｄ）に示すように、雄ねじ体１０の頭部２０を断面Ｄで切断する。この断面Ｄに沿って、サンダやカッタ等で頭部２０を切断すると、凹部５２も分断される。断面Ｄは、凹部５２の深さに相当する分だけ、被締結部材Ｈから離すことができるので、被締結部材Ｈが邪魔にならずに済む。頭部２０は、端面２４を含む第一部位２０ａと、凹部５２に対して半径方向外側のねじ体側凹凸５６（座面５０）を含むリング状の第二部位２０ｂと、凹部５２に対して半径方向内側の領域で軸部４０と一体的に残存する第三部位２０ｃに分割される。その結果、図７（Ｅ）に示すように、軸部４０及び第三部位２０ｃを、被締結部材Ｈの孔に対して、頭部２０から反対側に抜き出すことが可能となり、締結構造１による締結状態を簡単に解除することができる。 In such a fastening structure 1, when releasing the fastening state, the head 20 of the male screw body 10 is cut along a cross section D as shown in FIG. When the head 20 is cut along the cross section D with a sander, a cutter, or the like, the recess 52 is also divided. Since the cross section D can be separated from the fastened member H by an amount corresponding to the depth of the recess 52, the fastened member H does not have to be in the way. The head 20 has a first portion 20 a including the end surface 24, a ring-shaped second portion 20 b including the screw body side unevenness 56 (seat surface 50) radially outward with respect to the recess 52, and a radius with respect to the recess 52. It is divided into a third portion 20c that remains integrally with the shaft portion 40 in the inner region in the direction. As a result, as shown in FIG. 7E, the shaft portion 40 and the third portion 20c can be extracted from the head 20 to the opposite side with respect to the hole of the fastened member H. The fastening state can be easily released.

なお、本第三実施形態では、第一係合機構Ａとして、ねじ体側凹凸５６と第一受部側凹凸１０４が鋸刃形状の場合を例示したが、本発明はこれに限定されない。互いの凹凸を山形（双方とも傾斜面）としたり、峯と谷を湾曲させた波型の凹凸としたり、渦巻き状（スパイラル状）の溝又は山（凹凸）を形成したりすることも好ましい。微細凹凸をねじの周方向且つ半径方向の双方（平面状）に複数形成した、所謂エンボス形状を採用することもできる。 In the third embodiment, the case where the screw body side unevenness 56 and the first receiving portion side unevenness 104 have a saw blade shape is illustrated as the first engagement mechanism A, but the present invention is not limited to this. It is also preferable to make the unevenness of each other into a mountain shape (both inclined surfaces), a wave-like unevenness with curved ridges and valleys, or to form a spiral (spiral) groove or mountain (unevenness). A so-called embossed shape in which a plurality of fine irregularities are formed both in the circumferential direction and in the radial direction (planar shape) of the screw may be employed.

次に本発明の第四実施形態に係る締結構造について説明する。なお、第四実施形態は、第一実施形態と類似していることから、第一実施形態と同一又は類似する部位、部材の図面中の符号を一致させることで説明を省略し、ここでは異なる点を中心に説明する。 Next, a fastening structure according to a fourth embodiment of the present invention will be described. In addition, since 4th embodiment is similar to 1st embodiment, description is abbreviate | omitted by making the code | symbol in drawing of the same or similar part and member of 1st embodiment correspond, and is different here. The explanation will focus on the points.

図８（Ａ）に示すように、この締結構造１は、所謂六角ボルトに相当する雄ねじ体１０に適用されたものであり、頭部２０における座面５０に凹部５２が形成される。また、雄ねじ体１０に、第一雌ねじ体６０Ａ及び第二雌ねじ体６０Ｂが螺合することで、被締結部材Ｈを締結する。 As shown in FIG. 8A, the fastening structure 1 is applied to a male screw body 10 corresponding to a so-called hexagon bolt, and a recess 52 is formed in a seating surface 50 of the head 20. In addition, the fastened member H is fastened by the first female screw body 60A and the second female screw body 60B being screwed to the male screw body 10.

軸部４０の雄ねじ部４２は、右ねじと成る第一雄ねじ螺旋構造（矢印Ｒ参照）と、左ねじと成る第二雄ねじ螺旋構造（矢印Ｌ参照）との二種類の雄ねじ螺旋構造が同一領域上に重複して形成される。具体的に雄ねじ部４２には、軸心（ねじ軸）に垂直となる面方向において周方向に延びる略三日月状のねじ山４３ａが、雄ねじ部４２の一方側（図の左側）及び他方側（図の右側）に交互に設けられる。ねじ山４３ａをこのように構成することで、右回りに旋回する螺旋構造及び左回りに旋回する螺旋構造の二種類の螺旋条を、ねじ山４３ａの間に形成することが出来る。 The male screw portion 42 of the shaft portion 40 has two types of male screw spiral structures, ie, a first male screw spiral structure (see arrow R) serving as a right screw and a second male screw spiral structure (see arrow L) serving as a left screw in the same region. Overlaid on top. Specifically, the male screw portion 42 has a substantially crescent-shaped thread 43a extending in the circumferential direction in a plane direction perpendicular to the axis (screw shaft), on one side (left side in the figure) and the other side (left side in the figure). They are provided alternately on the right side of the figure. By configuring the screw thread 43a in this way, two types of spiral strips, a spiral structure that turns clockwise and a spiral structure that turns counterclockwise, can be formed between the screw threads 43a.

従って、雄ねじ部４２は、右ねじ及び左ねじの何れの雌ねじ体とも螺合することが可能となる。なお、二種類の雄ねじ螺旋構造が形成された雄ねじ部４２の詳細については、本願の発明者に係る特許第４６６３８１３号公報を参照されたい。 Therefore, the male screw portion 42 can be screwed with any of the right and left screw female screw bodies. For details of the male screw portion 42 in which two types of male screw spiral structures are formed, refer to Japanese Patent No. 4666313 related to the inventor of the present application.

図８（Ｂ）に示すように、第一雌ねじ体６０Ａは所謂六角ナットであり、内周面において、右ねじ（矢印Ｒ参照）の螺旋構造となる第一雌ねじ部８２Ａを有する。この第一雌ねじ部８２Ａは、雄ねじ部４２における第一雄ねじ螺旋構造と螺合する。図８（Ｃ）に示すように、第二雌ねじ体６０Ｂは所謂六角ナットであり、内周面において、左ねじ（矢印Ｌ参照）の螺旋構造となる第二雌ねじ部８２Ｂを有する。この第二雌ねじ部８２Ｂは、雄ねじ部４２における第二雄ねじ螺旋構造と螺合する。 As shown in FIG. 8B, the first female screw body 60A is a so-called hexagon nut, and has a first female screw portion 82A having a spiral structure of a right screw (see arrow R) on the inner peripheral surface. The first female screw portion 82A is screwed with the first male screw spiral structure in the male screw portion. As shown in FIG. 8C, the second female threaded body 60B is a so-called hexagon nut, and has a second female threaded part 82B having a spiral structure of a left-hand thread (see arrow L) on the inner peripheral surface. The second female screw portion 82B is screwed with the second male screw spiral structure in the male screw portion.

従って、図８（Ａ）に示すように、雄ねじ体１０の雄ねじ部４２に対して、第一雌ねじ体６０Ａ及び第二雌ねじ体６０Ｂを同時に螺合させることができる。このようにすると、例えば、雄ねじ体１０が回転した場合、第一雌ねじ体６０Ａ及び第二雌ねじ体６０Ｂが接近し合って干渉するか、又は、第一雌ねじ体６０Ａ及び第二雌ねじ体６０Ｂが離反し合うことで第一雌ねじ体６０Ａが被締結部材Ｈと干渉するかの何れかとなる。結果、雄ねじ体１０がいずれの方向に回転しようとしても、雄ねじ体１０は回転することができない。なお、特に図示しないが、締結後において、第一雌ねじ体６０Ａ及び第二雌ねじ体６０Ｂが相対回転できないようにする回転止手段を設けるようにすると、第二雌ねじ体６０Ｂ自体の緩み止めを実現できる。 Accordingly, as shown in FIG. 8A, the first female screw body 60A and the second female screw body 60B can be screwed simultaneously with the male screw portion 42 of the male screw body 10. In this case, for example, when the male screw body 10 rotates, the first female screw body 60A and the second female screw body 60B approach each other and interfere with each other, or the first female screw body 60A and the second female screw body 60B are separated. The first female threaded body 60 </ b> A interferes with the fastened member H by engaging each other. As a result, the male screw body 10 cannot rotate regardless of which direction the male screw body 10 rotates. Although not particularly illustrated, if a rotation stopping means is provided to prevent the first female screw body 60A and the second female screw body 60B from rotating relative to each other after fastening, the second female screw body 60B itself can be prevented from loosening. .

以上の構成となる本締結構造１の場合、被締結部材Ｈを締結した後、雄ねじ体１０の頭部２０側から解除することができない。従って、雄ねじ体１０の頭部２０を、軸直角方向の表示Ｍを参照して、それと一致する断面で切断すれば、第一実施形態と同様に頭部２０を分割できる。結果、被締結部材Ｈを簡単に取り出すことが可能となり、締結構造１による締結状態を簡単に解除することができる。 In the case of the fastening structure 1 having the above configuration, after the fastened member H is fastened, it cannot be released from the head 20 side of the male screw body 10. Therefore, if the head 20 of the male screw body 10 is cut with a cross section corresponding to the display M in the direction perpendicular to the axis, the head 20 can be divided as in the first embodiment. As a result, the fastened member H can be easily taken out, and the fastening state by the fastening structure 1 can be easily released.

なお、上記第四実施形態では、雄ねじ部において、リード方向が相異なる右ねじと左ねじの螺旋構造が形成される場合を例示したが、本発明はこれに限定されない。即ち、リード角及び／又はリード方向が相異なる第一及び第二螺旋構造となるような、あらゆる態様を含む。例えば、リード方向は同じでも、互いにリード角が異なるようにすればよい。 In the fourth embodiment, the case where the spiral structure of the right screw and the left screw having different lead directions is formed in the male screw portion is illustrated, but the present invention is not limited to this. That is, all aspects are included in which the first and second helical structures have different lead angles and / or lead directions. For example, even if the lead directions are the same, the lead angles may be different from each other.

なお、上記実施形態では、座面に形成される凹部を環状溝とする場合を例示したが、本発明はこれに限定されない。例えば図９に示す座面Ｚのように、軸部Ｇとの境界Ｑに接近して、周方向に複数の凹部Ｏを形成することで、軸部Ｇを囲繞することができる。分断後は、複数の凹部Ｏの隣接距離Ｊの存在によって、座面Ｚが残存するが、残存部位が脆弱状態となるので、これらを事後的に切除すれば良い。 In addition, in the said embodiment, although the case where the recessed part formed in a seat surface was made into an annular groove was illustrated, this invention is not limited to this. For example, the shaft portion G can be surrounded by forming a plurality of concave portions O in the circumferential direction by approaching the boundary Q with the shaft portion G like a seating surface Z shown in FIG. After the division, the seating surface Z remains due to the existence of the adjacent distances J of the plurality of recesses O. However, since the remaining portion is in a fragile state, these may be excised afterwards.

なお、上記実施形態では、本発明の締結構造をねじ体に適用する場合に限って示したが、締結体である限り、ねじ以外の締結構造に適用することができる。 In addition, in the said embodiment, although shown only when applying the fastening structure of this invention to a screw body, as long as it is a fastening body, it can apply to fastening structures other than a screw.

本発明は上記実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。 The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention.

１締結構造
１０雄ねじ体
２０頭部
４０軸部
５０、９０座面
５２、９２凹部
６０雌ねじ体
１００回転止部材 DESCRIPTION OF SYMBOLS 1 Fastening structure 10 Male screw body 20 Head 40 Shaft part 50, 90 Seat surface 52, 92 Recessed part 60 Female screw body 100 Anti-rotation member

Claims

軸部と、前記軸部に対して径方向に拡張する拡張部を備え、前記拡張部における被締結部材側の座面を、該被締結部材に対して直接的又は間接的に当接させて該被締結部材を締結する締結構造において、
前記座面は、前記軸部の周辺において、前記軸部を断続的又は連続的に囲繞するように設けられる凹部を有することを特徴とする締結構造。 A shaft portion and an expansion portion that expands in a radial direction with respect to the shaft portion, and a seating surface on the fastened member side of the expansion portion is brought into direct or indirect contact with the fastened member. In the fastening structure for fastening the fastened member,
The fastening structure according to claim 1, wherein the seating surface has a recess provided so as to intermittently or continuously surround the shaft portion around the shaft portion.

前記凹部は、環状の溝であることを特徴とする、
請求項１に記載の締結構造。 The recess is an annular groove,
The fastening structure according to claim 1.

前記座面には、被締結部材との相対回転を規制する規制手段が形成されることを特徴とする、
請求項１又は２に記載の締結構造。 The seating surface is formed with a regulating means for regulating relative rotation with the fastened member,
The fastening structure according to claim 1 or 2.

前記軸部は、リード角及び／又はリード方向が相異なる第一及び第二螺旋構造を有することを特徴とする、
請求項１乃至３の何れかに記載の締結構造。 The shaft portion has first and second helical structures having different lead angles and / or lead directions,
The fastening structure according to any one of claims 1 to 3.

前記軸部と前記拡張部が一体化されることで、釘体、鋲体又は雄ねじ体を構成することを特徴とする、
請求項１乃至４の何れかに記載の締結構造。 The shaft part and the extension part are integrated to form a nail body, a housing or a male screw body,
The fastening structure according to any one of claims 1 to 4.

前記拡張部は、雌ねじ孔を有する雌ねじ体であり、前記軸部には雄ねじ部が形成され、
該拡張部の前記雌ねじ孔と前記軸部の前記雄ねじ部が螺合することを特徴とする、
請求項１乃至４の何れかに記載の締結構造。 The extension portion is a female screw body having a female screw hole, and a male screw portion is formed on the shaft portion,
The female screw hole of the extension portion and the male screw portion of the shaft portion are screwed together,
The fastening structure according to any one of claims 1 to 4.

前記座面に形成される前記凹部は、前記雌ねじ孔の内壁と連続することを特徴とする、
請求項６に記載の締結構造。 The recess formed in the seating surface is continuous with the inner wall of the female screw hole,
The fastening structure according to claim 6.

前記凹部の底部周辺の断面形状は、略湾状を成すことを特徴とする、
請求項１乃至７の何れかに記載の締結構造。 The cross-sectional shape around the bottom of the recess is substantially bay-shaped,
The fastening structure according to any one of claims 1 to 7.