JP2003156026A - Bolt having nut fall preventive function - Google Patents
Bolt having nut fall preventive functionInfo
- Publication number
- JP2003156026A JP2003156026A JP2001354683A JP2001354683A JP2003156026A JP 2003156026 A JP2003156026 A JP 2003156026A JP 2001354683 A JP2001354683 A JP 2001354683A JP 2001354683 A JP2001354683 A JP 2001354683A JP 2003156026 A JP2003156026 A JP 2003156026A
- Authority
- JP
- Japan
- Prior art keywords
- nut
- bolt
- bolt shaft
- axial direction
- inward
- 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
Links
Landscapes
- Clamps And Clips (AREA)
- Connection Of Plates (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ナットの脱落防止
を図り得るボルトに関する。TECHNICAL FIELD The present invention relates to a bolt capable of preventing a nut from falling off.
【０００２】[0002]
【従来の技術】高速道路、高架、鉄橋などの構造部材の
締結のために、従来よりボルト・ナットが広く用いられ
ており、ボルト・ナットの脱落による事故防止のため
に、例えばシャークリップなどによりボルト・ナットの
脱落防止が図られている。また、ボルト・ナット毎にシ
ャークリップなどを敷設する対策の他にも、例えば、予
めボルト軸に係止ピンを設けたボルトを用いて、ボルト
・ナットを締結する毎に工具を用いて係止ピンを折曲し
てナットを係止し、ナットの脱落防止を図るものも開発
されている。2. Description of the Related Art Bolts and nuts have been widely used in the past for fastening structural members such as highways, overpasses, and iron bridges. The bolts and nuts are prevented from falling off. In addition to measures to lay a shear clip etc. for each bolt / nut, for example, use a bolt that has a locking pin on the bolt shaft in advance, and lock with a tool every time the bolt / nut is fastened. It has also been developed to bend the pin and lock the nut to prevent the nut from falling off.
【０００３】[0003]
【発明が解決しようとする課題】ところが、高速道路な
どに採用されるボルト・ナットは膨大な数量であり、各
ボルト・ナット毎に、ボルト・ナットとは別体のシャー
クリップなどを付加したり、あるいは、工具を用いて係
止ピンを折曲することは多大な手間を要し、工期短縮、
コスト低減の面からも改善が望まれている。更に、高速
道路や高架の工事では、安全性を配慮して施工現場をバ
リアで覆うことが多く、このため、作業員の手元が薄暗
く、シャークリップの取付作業や、係止ピンの折曲作業
などの細かい作業を行い難い。However, the number of bolts and nuts adopted in highways is enormous, and a shear clip, which is separate from the bolts and nuts, is added to each bolt and nut. Or, bending the locking pin with a tool requires a lot of work and shortens the construction period.
Improvements are also desired in terms of cost reduction. In addition, in construction of highways and overpasses, the construction site is often covered with a barrier in consideration of safety, which makes workers' hands dim, making shear clip installation work and locking pin bending work. It is difficult to do detailed work such as.
【０００４】本発明は、このような事情に鑑みて提案さ
れるもので、施工の手間の削減、作業の簡素化を図りつ
つも、確実にナットの脱落防止を図り得るナット脱落防
止機能を有するボルトを提供することを目的とする。The present invention has been proposed in view of the above circumstances, and has a nut disengagement prevention function capable of surely preventing disengagement of nuts while reducing the labor of construction and simplifying the work. Intended to provide bolts.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するために、次の技術的手段を講じた。即ち、本発明
のナット脱落防止機能を有するボルトは、オネジが形成
されたボルト軸と、該ボルト軸に取り付けられたナット
脱落防止部とを備え、該ナット脱落防止部は、通常時は
ボルト軸に螺着されるナットのメネジ内径よりも径方向
外方に突出してナットのボルト軸からの脱落を防止する
とともに、前記突出部を径方向内方に押し込むことでナ
ットのメネジ内径よりも小径となるように弾性変形可能
であることを特徴とするものである。The present invention takes the following technical means in order to achieve the above object. That is, a bolt having a nut disengagement prevention function of the present invention includes a bolt shaft formed with a male screw and a nut disengagement prevention part attached to the bolt shaft. The nut that is screwed to the nut protrudes outward in the radial direction from the internal diameter of the internal thread of the nut to prevent the nut from falling off the bolt shaft, and by pushing the protrusion inward in the radial direction, the diameter becomes smaller than the internal diameter of the internal thread of the nut. It is characterized in that it is elastically deformable.
【０００６】また、本発明のナット脱落防止機能を有す
るボルトは、オネジが形成されたボルト軸と、該ボルト
軸に取り付けられてナットを係止する弾性変形可能なナ
ット脱落防止部とを備え、該ナット脱落防止部は、ボル
ト軸にナットを螺合させて軸方向内方へ移動させると、
ナットの移動により弾性変形してナットの軸方向内方へ
の移動を許容し、ナット脱落防止部を越えてナットが軸
方向内方へ移動した後はナットによる弾性変形が解除さ
れて復元し、ナットを係止してナットの緩みによる軸方
向外方への移動を阻止することを特徴とするものであ
る。A bolt having a nut dropout prevention function according to the present invention comprises a bolt shaft having a male thread formed thereon, and an elastically deformable nut dropout prevention part attached to the bolt shaft to lock the nut. When the nut is screwed into the bolt shaft to move the nut inward in the axial direction,
When the nut moves, it elastically deforms to allow the nut to move inward in the axial direction, and after the nut moves axially inward beyond the nut drop prevention part, the elastic deformation due to the nut is released and restored. The present invention is characterized in that the nut is locked to prevent the nut from loosening and axially moving outward.
【０００７】かかる本発明のボルトによれば、通常のボ
ルト・ナットと同様に、ボルト軸にナットを螺合・締結
させるだけで確実にナットの脱落防止を図ることがで
き、脱落防止のための特別な作業を要しない。これによ
り、作業の簡素化・迅速化を図ることができると共に、
バリア内などの薄暗い現場においても容易に作業を行う
ことが可能である。また、ボルト軸にナットを螺合・締
結した後に万一ナットが緩んでも、ナットはナット脱落
防止部で係止されてボルト軸から脱落することはなく、
定期的なメンテナンス時に増し締めすることができる。According to the bolt of the present invention, like a normal bolt and nut, the nut can be surely prevented from falling off by simply screwing and fastening the nut on the bolt shaft. No special work required. This makes it possible to simplify and speed up the work, and
It is possible to work easily even in a dimly lit place such as inside a barrier. In addition, even if the nut is loosened after screwing and tightening the nut on the bolt shaft, the nut will not be disengaged from the bolt shaft by being locked by the nut drop prevention part.
It can be tightened during regular maintenance.
【０００８】上記本発明において、ナット脱落防止部
は、ボルト軸の先端部の軸中央から先端側へ向けて延出
する基部と、該基部に続いてＣ字状に折り返して湾曲し
た弾性変形部と、該弾性変形部に続いてボルト軸の軸方
向内方へ向かうに連れてボルト軸の中心軸との間隔が広
がる直線状の係止部とを一体化して形成され、該係止部
はオネジの形成部位に軸方向へ設けられた収容部の内部
に位置すると共に係止部の先端はオネジから突出し、該
係止部は弾性変形部の弾性変形によって収容部へ退入可
能とされており、係止部は、ナットの軸方向内方への移
動により押圧され収容部の内部へ退入してナットの軸方
向内方への移動を許容し、ナットが係止部を越えて軸方
向内方へ移動してナットによる押圧が解除されると、弾
性変形部の復元力によってオネジから突出してナットの
軸方向外方の端面を係止する構成を採ることができる。In the above-mentioned present invention, the nut disengagement prevention portion includes a base portion extending from the shaft center of the tip end portion of the bolt shaft toward the tip end side, and an elastically deformable portion which is bent back into a C-shape following the base portion. And the elastically deformable portion, and a linear locking portion whose distance from the central axis of the bolt shaft widens inward in the axial direction of the bolt shaft are integrally formed. The locking portion is located inside the accommodating portion axially provided at the male screw forming portion, and the tip of the locking portion projects from the male screw, and the locking portion can be retracted into the accommodating portion by elastic deformation of the elastically deforming portion. The locking part is pushed by the inward movement of the nut in the axial direction and retracts into the accommodation part to allow the nut to move inward in the axial direction. When it is moved inward in the direction and the pressure applied by the nut is released, the restoring force of the elastic deformation It can take a structure for locking the end surface of the axially outward of the nut projects from the male screw me.
【０００９】この構成によれば、係止部が収容部へ退入
する構成であるから、輸送途中や施工現場でナット脱落
防止部に外力が作用しても、このナット脱落防止部の塑
性変形を防止できる。さらに、係止部は直線状で軸方向
内方へ向かうに連れてボルト軸の中心軸との間隔が広が
るように傾斜している。従って、ナットをボルト軸に螺
合させて軸方向内方へ移動させると、ナットに形成され
たメネジにより係止部は押圧されて収容部の内部へ退入
する。これにより、ナットは係止されることなく螺合の
促進が許容される。According to this structure, since the locking portion is retracted into the accommodating portion, even if an external force acts on the nut drop prevention part during transportation or at a construction site, the nut drop prevention part is plastically deformed. Can be prevented. Further, the locking portion is linear and is inclined so that the distance from the central axis of the bolt shaft increases as it goes inward in the axial direction. Therefore, when the nut is screwed onto the bolt shaft and moved inward in the axial direction, the locking portion is pressed by the female screw formed on the nut and retracts into the housing portion. This allows the nut to be engaged without being locked.
【００１０】そして、螺合が促進してナットが係止部を
越えて軸方向内方へ更に移動すると、ナットのメネジに
よる係止部の押圧が解除され、収容部に退入していた係
止部は弾性変形部の復元力によってナットの螺合前と同
一の状態に戻り、係止部の先端はオネジから突出する。
この状態に至ると、ナットが緩んで軸方向外方へ移動し
ようとすると、ナットの軸方向外方の端面がオネジから
突出した係止部の先端に当接し、係止部は軸方向外方へ
向けて押圧力を受ける。しかし、係止部の軸方向外方へ
向かう押圧力に対しては弾性変形部は弾性変形を呈さ
ず、ナットは係止部で係止されて軸方向外方への移動が
阻止され、脱落が防止される。Then, when screwing is promoted and the nut further moves axially inward beyond the locking portion, the pressing of the locking portion by the female screw of the nut is released, and the nut retreats into the accommodating portion. The stop portion returns to the same state as before the screwing of the nut by the restoring force of the elastically deformable portion, and the tip of the locking portion projects from the male screw.
In this state, when the nut loosens and tries to move axially outward, the axially outward end face of the nut abuts the tip of the locking part that protrudes from the male screw, and the locking part is axially outward. Receives a pressing force toward. However, the elastically deformable portion does not elastically deform against the pressing force of the locking portion outward in the axial direction, and the nut is locked by the locking portion to prevent the nut from moving outward in the axial direction. Is prevented.
【００１１】このように、本発明によれば、極めて構造
の簡単なナット脱落防止部をボルト軸に設けるだけで、
ナットの脱落を確実に防止可能である。また、ボルト軸
にナットを螺合・締結後に、オネジから係止部の先端が
突出した状態を目視あるいは触感で容易に確認すること
ができ、施工の信頼性を向上させることができる。As described above, according to the present invention, by simply providing the nut drop-preventing portion having an extremely simple structure on the bolt shaft,
It is possible to reliably prevent the nut from falling off. In addition, after the nut is screwed and fastened to the bolt shaft, it is possible to easily visually or visually check the state in which the tip of the engaging portion projects from the male screw, and it is possible to improve the construction reliability.
【００１２】本発明の構成において、ボルト軸に形成さ
れるオネジから係止部の先端が突出する長さは、ボルト
にナットを螺合・締結したときに、係止部の先端がナッ
トの軸方向外方の端面のメネジ近傍に当接するように設
定するのが良い。係止部の先端のオネジからの突出長が
少ない場合は、係止部の先端はナットに形成されたメネ
ジのネジ山に当接する。このため、緩みによりナットが
軸方向外方へ移動しようとすると、係止部の先端に加わ
る径方向内方の分力が増大し、係止部の先端がメネジの
ネジ山を滑って収容部へ退入し易く、安定した係止が確
保できない。In the structure of the present invention, the length of the tip of the engaging portion protruding from the male screw formed on the bolt shaft is such that when the nut is screwed and fastened to the bolt, the tip of the engaging portion is the shaft of the nut. It is preferable to set so as to abut the vicinity of the female screw on the end face outward in the direction. When the protruding length of the tip of the locking portion from the male screw is short, the tip of the locking portion abuts on the thread of the female screw formed on the nut. Therefore, when the nut tries to move axially outward due to loosening, the radially inward component force applied to the tip of the locking portion increases, and the tip of the locking portion slides on the thread of the female screw to accommodate the housing portion. It is easy to move in and out, and stable locking cannot be secured.
【００１３】逆に、係止部の先端のオネジからの突出長
が大きい場合は、ボルト軸の先端部の端面においても係
止部がオネジから突出する。このため、ナットの螺合に
際してナットで係止部を押圧しつつボルト軸に螺合させ
なければならず、作業効率が低下する。係止部の先端の
オネジからの突出長を前記設定とすることにより、安定
した係止が確保され作業効率も向上すると共に、ナット
の外側面から係止部の先端が突出しないので、ボックス
レンチを用いてナットの螺合・締結や増し締めを行うこ
とも可能である。On the other hand, when the length of protrusion of the tip of the engaging portion from the male thread is large, the engaging portion also projects from the male thread even at the end face of the tip portion of the bolt shaft. For this reason, when the nut is screwed, it is necessary to press the locking portion with the nut and screw the bolt shaft to the bolt shaft, resulting in a decrease in working efficiency. By setting the protruding length of the tip of the locking part from the male screw to the above-mentioned setting, stable locking is secured, work efficiency is improved, and the tip of the locking part does not project from the outer surface of the nut. It is also possible to screw the nut, tighten it, and retighten it.
【００１４】また、本発明の構成において、ボルト軸の
中心軸に対するナット脱落防止部の係止部の傾斜角度は
略１５度に設定するのが好適である。係止部の先端のオ
ネジからの突出長さは前記したように規制されるので、
係止部の傾斜角度が減少すると、ボルト軸の先端部の端
面においても係止部がオネジから突出する。このため、
ナットで係止部を押圧しつつボルト軸に螺合させなけれ
ばならず、作業効率が低下する。Further, in the configuration of the present invention, it is preferable that the inclination angle of the locking portion of the nut drop prevention portion with respect to the central axis of the bolt shaft is set to about 15 degrees. Since the protruding length from the male screw at the tip of the locking portion is regulated as described above,
When the inclination angle of the locking portion decreases, the locking portion also protrudes from the male screw even at the end surface of the tip portion of the bolt shaft. For this reason,
It is necessary to press the locking portion with the nut and screw it onto the bolt shaft, which reduces the work efficiency.
【００１５】逆に、係止部の傾斜角度が増大すると、緩
みによりナットが軸方向外方へ移動しようとすると、係
止部の先端に加わる径方向外方の分力が増大する。この
ため、係止部の先端がナットの径方向外方の端面上を外
方へ向けて滑りやすく、安定した係止が確保できない。
ボルト軸の中心軸に対する係止部の傾斜角度を前記設定
とすることにより、安定した係止が確保され作業効率も
向上する。On the contrary, when the inclination angle of the locking portion increases, when the nut tries to move axially outward due to loosening, the radial outward component force applied to the tip of the locking portion increases. For this reason, the tip of the locking portion tends to slide outward on the radially outer end surface of the nut, and stable locking cannot be secured.
By setting the inclination angle of the locking portion with respect to the central axis of the bolt shaft to the above-mentioned setting, stable locking is secured and work efficiency is also improved.
【００１６】本発明の構成において、ナットを確実に係
止するように係止部の先端は適宜の形状に加工を施すこ
とができる。例えば、係止部の先端とナットの軸方向外
方の端面との間の摩擦力を増加させるように、係止部の
先端部を所定角度だけ折曲する構造を採ることができ
る。In the structure of the present invention, the tip of the engaging portion can be processed into an appropriate shape so as to securely engage the nut. For example, it is possible to adopt a structure in which the tip portion of the engaging portion is bent at a predetermined angle so as to increase the frictional force between the tip of the engaging portion and the axially outer end surface of the nut.
【００１７】また、本発明の構成において、ボルト軸の
先端部から先端側へ向けてナット脱落防止部が突出する
長さは、前記したナット脱落防止部の形状規制に従いつ
つできる限り少ない方が良い。ナット脱落防止部の突出
長を低減することにより、ボックスレンチを用いてボル
ト軸にナットを螺合・締結したり、あるいは、ナットを
増し締めする場合に、ボックスレンチのボックス深さで
規制されてレンチがナットに係合しない不具合が減少す
る。Further, in the structure of the present invention, it is preferable that the length by which the nut drop-off preventing portion projects from the tip end portion of the bolt shaft toward the tip end side is as small as possible while complying with the above-mentioned regulation of the nut drop-off prevention portion. . By reducing the protruding length of the nut fall-out prevention part, when the nut is screwed and fastened to the bolt shaft using a box wrench, or when the nut is retightened, it is regulated by the box depth of the box wrench. Reduces the problem of the wrench not engaging the nut.
【００１８】[0018]
【発明の実施の形態】以下に、図示実施例に基づいて本
発明の実施の形態を詳細に説明する。図１〜図５は本発
明の実施例に係るボルト１を示している。図１（ａ）は
ボルト１の平面図、図１（ｂ）はその正面図、図１
（ｃ）はその側面図、図２（ａ）はボルト１に螺合する
ナットの縦断面図、図２（ｂ）はボルト１の要部縦断面
図、図２（ｃ）はその要部側面図である。また、図３
（ａ）〜（ｃ）はボルト１にナットを螺合・締結する課
程を示す縦断面図、図４はボルト１の施工例を示す断面
図、図５（ａ），（ｂ）はボルト１の製造工程を示す説
明図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail based on illustrated embodiments. 1 to 5 show a bolt 1 according to an embodiment of the present invention. 1A is a plan view of the bolt 1, FIG. 1B is a front view thereof, and FIG.
2 (c) is a side view thereof, FIG. 2 (a) is a vertical cross-sectional view of a nut screwed into the bolt 1, FIG. 2 (b) is a vertical cross-sectional view of an essential part of the bolt 1, and FIG. 2 (c) is an essential part thereof. It is a side view. Also, FIG.
5A to 5C are vertical cross-sectional views showing a process of screwing and fastening a nut on the bolt 1, FIG. 4 is a cross-sectional view showing a construction example of the bolt 1, and FIGS. FIG. 6 is an explanatory view showing a manufacturing process of.
【００１９】ボルト１は、ボルト頭２と、ボルト軸３
と、ナット脱落防止部５とを備えており、ボルト頭２と
ボルト軸３は鍛造や圧造等により一体成形され、ボルト
軸３の先端部に脱落防止部材（ナット脱落防止部）５を
溶接固定したものである。The bolt 1 includes a bolt head 2 and a bolt shaft 3.
And a nut drop prevention part 5, the bolt head 2 and the bolt shaft 3 are integrally formed by forging, press forming, etc., and a drop prevention member (nut drop prevention part) 5 is welded and fixed to the tip end of the bolt shaft 3. It was done.
【００２０】本実施例のボルト１は、六角ボルトであ
り、ボルト頭２が六角柱状に成形されているが、本発明
はこの形状に限定されるものではなく、種々の形態のボ
ルトに採用可能である。また、脱落防止部材５を溶接固
定する前のボルト１は、適宜の鉄鋼材料を冷間鍛造若し
くは熱間鍛造することにより、ボルト頭２とボルト軸３
を一体に有する図５（ａ）に示す中間製造物を成形し、
そのボルト軸３の軸方向所定範囲に渡って、オネジ４を
転造により成形して得ることができる。The bolt 1 of this embodiment is a hexagonal bolt, and the bolt head 2 is formed in a hexagonal column shape, but the present invention is not limited to this shape and can be applied to various types of bolts. Is. Further, the bolt 1 before the drop-preventing member 5 is fixed by welding, the bolt head 2 and the bolt shaft 3 are obtained by cold forging or hot forging an appropriate steel material.
Is formed integrally with the intermediate product shown in FIG.
It can be obtained by rolling the male screw 4 over a predetermined range in the axial direction of the bolt shaft 3.
【００２１】ボルト軸３には、その軸方向先端部から所
定範囲に渡ってオネジ４が設けられている。このオネジ
４は、適宜のピッチ及びリードで成形加工することがで
き、一条ネジであっても、二条以上の多条ネジであって
も良い。また、オネジ４のネジ山形は、図示実施例では
三角ネジを採用しているが、四角ネジ、台形ネジ、ノコ
歯ネジなどの適宜のものを採用できる。The bolt shaft 3 is provided with a male screw 4 over a predetermined range from the tip end portion in the axial direction. The male screw 4 can be molded with an appropriate pitch and lead, and may be a single-thread screw or a multi-thread screw having two or more threads. Further, as the thread shape of the male screw 4, a triangular screw is adopted in the illustrated embodiment, but a suitable screw such as a square screw, a trapezoidal screw, and a saw screw can be adopted.
【００２２】また、ボルト軸３の軸方向先端部中央に
は、軸方向内方へ向けて所定深さの固定孔３１が穿孔さ
れている。この固定孔３１の穿孔は旋盤あるいはドリル
などを用いて行われる。また、オネジ４の形成される部
位で、軸方向先端部から軸方向内方へ向けて所定長さの
範囲には、径方向内方へ向けて溝３２が削設され、この
溝３２によって収容部３２を形成している。この収容部
３２の深さは軸方向先端部が最も深く、軸方向内方へ向
かうに連れて浅くなり、収容部３２の軸方向内方端部は
深さがゼロである。また、収容部３２の幅ｄ２は後述す
るナット脱落防止部５の係止部５３の外径よりも僅かに
大きい。この収容部３２はオネジ４を転造により成形し
た後に削設する。これにより、収容部３２の両側のオネ
ジ４の螺旋構造は連続しており、ナットを支障なく螺合
可能である。In addition, a fixing hole 31 having a predetermined depth is bored inward in the axial direction at the center of the axial tip portion of the bolt shaft 3. The fixing hole 31 is drilled by using a lathe or a drill. Further, in the area where the male screw 4 is formed, a groove 32 is cut inward in the radial direction within a range of a predetermined length from the tip end portion in the axial direction toward the inner side in the axial direction. The part 32 is formed. The depth of the accommodating portion 32 is the deepest at the axial end portion and becomes shallower as it goes inward in the axial direction, and the axial inward end portion of the accommodating portion 32 has a depth of zero. Further, the width d2 of the accommodating portion 32 is slightly larger than the outer diameter of the locking portion 53 of the nut drop prevention portion 5, which will be described later. The housing portion 32 is cut after the male screw 4 is formed by rolling. As a result, the spiral structure of the male screws 4 on both sides of the housing portion 32 is continuous, and the nut can be screwed without any trouble.
【００２３】脱落防止部材（ナット脱落防止部）５は、
図２（ｂ）、図５（ｂ）に示すように、ボルト軸３の先
端部の軸中央から先端側へ向けて直線状に延出する基部
５０と、基部５０に続いてＣ字状に折り返して湾曲した
弾性変形部５２と、弾性変形部５２に続いて基部５０の
先端へ向かうに連れて基部５０との間隔が広がる直線状
の係止部５３とを一体化して形成された部材で、基部５
０の基端には、スポット溶接用のフランジ５１が形成さ
れている。また、本実施例では、基部５０と係止部５３
との成す角度を略１５度としている。The fall prevention member (nut fall prevention portion) 5 is
As shown in FIG. 2 (b) and FIG. 5 (b), a base portion 50 that linearly extends from the shaft center of the tip end portion of the bolt shaft 3 toward the tip end side, and a C-shaped portion following the base portion 50. A member integrally formed with an elastically deformable portion 52 that is folded back and curved, and a linear locking portion 53 that widens the distance between the elastically deformable portion 52 and the base portion 50 as it goes toward the tip of the base portion 50. , Base 5
At the base end of 0, a flange 51 for spot welding is formed. Further, in this embodiment, the base portion 50 and the locking portion 53
The angle formed by and is approximately 15 degrees.
【００２４】この脱落防止部材５は、弾性変形部５２の
湾曲によって弾性変形を可能にしており、係止部５３を
基部５０側へ押圧して近接させた後に押圧力を解除する
と、元の形状に復元する。この脱落防止部材５は、所定
の外径を有する適宜の鉄鋼材料を用いて製することがで
き、本実施例では、鋼材を湾曲させて成形加工してい
る。The fall-preventing member 5 is elastically deformable by the bending of the elastically deforming portion 52, and when the pressing force is released after the locking portion 53 is pressed toward the base portion 50 and brought close to it, the original shape is maintained. Restore to. The fall-off preventing member 5 can be made of an appropriate steel material having a predetermined outer diameter, and in this embodiment, the steel material is curved and formed.
【００２５】本実施例のボルト１は、図５（ｂ）に示す
ように、ボルト軸３に脱落防止部材５を溶接固定したも
のである。則ち、脱落防止部材５の係止部５３がボルト
軸３に設けた収容部４１の内部に位置するようにして、
基部５０のフランジ５１をボルト軸３の先端面３０に当
接させ、そして、フランジ５１と先端面３０との間を抵
抗溶接して固定して製されたものである。As shown in FIG. 5 (b), the bolt 1 of this embodiment has a bolt shaft 3 to which a drop-preventing member 5 is welded and fixed. That is, the locking portion 53 of the fall prevention member 5 is positioned inside the housing portion 41 provided on the bolt shaft 3,
The flange 51 of the base portion 50 is abutted on the tip surface 30 of the bolt shaft 3, and the flange 51 and the tip surface 30 are resistance-welded and fixed.
【００２６】この本実施例のボルト１は、図２に示すよ
うに、脱落防止部材５の係止部５３がボルト軸３の収容
部３２の内部に位置し、係止部先端５３ａがオネジ４か
ら僅かに突出し、係止部５３は弾性変形部５２の弾性変
形によって収容部３２の内部へ退入可能である。また、
脱落防止部材５の基部５０は、ボルト軸３の中心軸上に
軸方向へ向けて固定されるので、係止部５３はボルト軸
３の軸方向内方へ向かうに連れて、ボルト軸３の中心軸
との間隔が広がるように傾斜する。In the bolt 1 of this embodiment, as shown in FIG. 2, the locking portion 53 of the drop-off preventing member 5 is located inside the accommodating portion 32 of the bolt shaft 3, and the locking portion tip 53a is the male screw 4. The locking portion 53 can be retracted into the accommodation portion 32 by elastic deformation of the elastic deformation portion 52. Also,
Since the base portion 50 of the captive prevention member 5 is fixed axially on the central axis of the bolt shaft 3, the locking portion 53 moves toward the inner side of the bolt shaft 3 in the axial direction. Incline so that the distance from the central axis increases.
【００２７】脱落防止部材５の弾性変形部５２の外径Ｄ
１は、ナット６に形成されたメネジ６０の山径Ｄ２より
も小径であり、ナット６は脱落防止部材５を支障なく挿
通させることができる。また、ボルト軸３の先端部端面
３０において、係止部５３がオネジ４から突出しない形
状として、ナット６をボルト軸３に螺合させる際に、ナ
ット６で係止部５３を押圧することなく螺合可能な構成
としている。更に、収容部３２は、係止部５３を収容部
３２の内部に押圧収容した状態で、係止部先端５３ａが
オネジ４の谷に掛からない深さとして、ナット６の螺合
による軸方向内方への移動をスムーズに行える形状とし
ている。The outer diameter D of the elastically deforming portion 52 of the drop-off preventing member 5
1 has a diameter smaller than the mountain diameter D2 of the female screw 60 formed on the nut 6, and the nut 6 can be inserted through the fall prevention member 5 without hindrance. Further, in the end surface 30 of the tip end portion of the bolt shaft 3, the locking portion 53 does not project from the male screw 4, and when the nut 6 is screwed onto the bolt shaft 3, the locking portion 53 is not pressed by the nut 6. It is configured to be screwed. Further, in the accommodating portion 32, in a state where the engaging portion 53 is pressed and accommodated in the accommodating portion 32, the engaging portion tip 53a has a depth that does not cover the valley of the male screw 4 and is axially inward by screwing the nut 6. It has a shape that allows smooth movement to one side.
【００２８】本実施例のボルト１にナット６を螺合・締
結するには、図３（ａ）に示すように、ナット６に脱落
防止部材５を挿通させてナット６のメネジ６０をボルト
軸３のオネジ４に螺合させる。このとき、前記したよう
に、螺合させるまでに係止部５３を押圧する必要がない
ので、螺合が容易である。次いで、ボルト軸３に螺合し
たナット６を回転させて螺合を促進すると、図３（ｂ）
に示すように、係止部５３はナット６のメネジ６０に押
圧されて収容部３２に退入しつつ螺合が進行する。In order to screw and fasten the nut 6 to the bolt 1 of the present embodiment, as shown in FIG. 3 (a), the cap 6 of the nut 6 is inserted into the nut 6 and the female screw 60 of the nut 6 is screwed onto the bolt shaft. It is screwed to the male screw 4 of 3. At this time, as described above, since it is not necessary to press the locking portion 53 before screwing, screwing is easy. Next, when the nut 6 screwed onto the bolt shaft 3 is rotated to facilitate screwing, the nut 6 shown in FIG.
As shown in FIG. 5, the locking portion 53 is pushed by the female screw 60 of the nut 6 and is screwed into the housing portion 32 while being screwed.
【００２９】螺合が進行してナット６が脱落防止部材５
の係止部５３を越えると、図３（ｃ）に示すように、そ
れまで、ナット６のメネジ６０で押圧されて収容部３２
に退入していた係止部３２は、押圧が解除されて弾性変
形部５２の復元力によってオネジ４から突出する。そし
て、一旦、係止部３２が突出すると、ナット６が緩んで
軸方向外方へ移動しようとしても、係止部先端５３ａが
ナット６の軸方向外方の端面６１と当接して係止し、ナ
ット６の緩みが阻止され脱落が防止される。特に、本実
施例によれば、係止部先端５３ａがナット６に当接して
係止するので、係止部先端５３ａとナット６との間の摩
擦力によりナット６の回転を阻止する効果をも奏し、確
実な係止を行うことが可能である。As the screwing proceeds, the nut 6 is prevented from falling off.
3 (c), it is pressed by the female screw 60 of the nut 6 until it reaches the accommodating portion 32, as shown in FIG. 3 (c).
The locking portion 32 that has been retracted to is released from the pressure and protrudes from the male screw 4 by the restoring force of the elastically deforming portion 52. Once the locking portion 32 protrudes, even if the nut 6 loosens and tries to move axially outward, the locking portion tip 53a abuts on the axially outer end surface 61 of the nut 6 and locks. The nut 6 is prevented from being loosened and prevented from falling off. In particular, according to this embodiment, since the tip 53a of the locking portion abuts and locks the nut 6, it is possible to prevent the rotation of the nut 6 by the frictional force between the tip 53a of the locking portion and the nut 6. It is also possible to perform reliable locking.
【００３０】本実施例のボルト１を用いて複数の被締結
部材を締結する場合、図４に示すように、被締結部材
７，８に形成したボルト孔７０，８０にボルト１のボル
ト軸３を挿通し、ボルト軸３の先端から脱落防止部材５
を通してナット６を螺合締結する。When a plurality of members to be fastened are fastened using the bolt 1 of the present embodiment, as shown in FIG. 4, the bolt shaft 3 of the bolt 1 is inserted into the bolt holes 70 and 80 formed in the fastened members 7 and 8. And prevent the bolt shaft 3 from falling off from the tip of the bolt shaft 3.
The nut 6 is screwed and fastened.
【００３１】このように、ナット６をボルト軸３に螺合
・締結して被締結部材７，８を締結した状態では、ナッ
ト６の軸方向外方の端面６１と係止部先端５３ａとの間
に軸方向へ向けて隙間ｄ３が形成される。この隙間ｄ３
が所定値以下となるように、被締結部材７，８の厚さに
応じてボルト軸３の長さを調整することにより、ナット
６が大きく緩むことが阻止され、仮にナット６に緩みが
生じた場合でも、被締結部材７，８のがたつきの増大を
防止することが可能である。尚、一旦、締結したナット
６をボルト１から取り外す場合は、係止部５３を収容部
３２の内部へ押し込んだ状態でナット６を緩めることで
可能である。As described above, when the nut 6 is screwed and fastened to the bolt shaft 3 and the fastened members 7 and 8 are fastened, the axially outer end face 61 of the nut 6 and the tip 53a of the engaging portion 53a. A gap d3 is formed therebetween in the axial direction. This gap d3
By adjusting the length of the bolt shaft 3 in accordance with the thickness of the members to be fastened 7 and 8 so that is less than or equal to a predetermined value, it is possible to prevent the nut 6 from loosening significantly, and temporarily loosen the nut 6. Even in the case of, it is possible to prevent the rattling of the members to be fastened 7, 8 from increasing. When the nut 6 that has been fastened once is removed from the bolt 1, it is possible to loosen the nut 6 with the locking portion 53 being pushed into the housing portion 32.
【００３２】尚、脱落防止部材５の形状は前記実施例に
示した形状に限定されるものではなく、同一機能を有す
るものであれば異なる形状のものを採用しても良い。ま
た、前記実施例では、係止部５３を退入させる収容部３
２をボルト軸３に設けた構成を採用したが、本発明はこ
のような構成に限られるものではない。例えば、ボルト
軸３に収容部３２を設けずに、係止部先端５３ａをボル
ト軸３の先端部の端面３０に位置させてオネジ４から突
出させる構成を採用することも可能である。この構成に
よれば、ナット６の軸方向外方の端面６１がボルト軸３
の先端部の端面３０を越えた時点で、ナット６の軸方向
外方への移動が阻止され脱落が防止される。また、フラ
ンジ５１を基部５０の軸方向中途部に設け、ボルト軸３
の先端面には基部５０を挿通し得る取付穴を設けること
により、より安定して脱落防止部材５をボルト軸３に取
り付け固定することも可能である。The shape of the fall-off preventing member 5 is not limited to the shape shown in the above embodiment, but different shapes may be adopted as long as they have the same function. Further, in the above-described embodiment, the housing portion 3 for retracting the locking portion 53.
Although the configuration in which 2 is provided on the bolt shaft 3 is adopted, the present invention is not limited to such a configuration. For example, it is possible to adopt a configuration in which the locking portion tip 53 a is positioned on the end face 30 of the tip of the bolt shaft 3 and protrudes from the male screw 4 without providing the housing portion 32 on the bolt shaft 3. According to this structure, the axially outer end surface 61 of the nut 6 has the bolt shaft 3
When the nut 6 crosses the end surface 30 of the tip end portion, the nut 6 is prevented from moving outward in the axial direction, and is prevented from falling off. In addition, the flange 51 is provided at an axially intermediate portion of the base portion 50, and the bolt shaft 3
It is also possible to more stably attach and fix the fall prevention member 5 to the bolt shaft 3 by providing a mounting hole through which the base portion 50 can be inserted in the front end surface of the.
【００３３】[0033]
【発明の効果】本発明によれば、別体のシャークリップ
などを付加施工することなく、ボルト軸に通常通りナッ
トを螺合・締結するだけでボルト軸からのナットの脱落
を確実に阻止することができ、更に、係止部の突出を目
視あるいは触感で確認することにより確実な施工を容易
に確認することができ、より一層のナットの脱落防止の
確実性を向上することができる。According to the present invention, it is possible to reliably prevent the nut from falling off from the bolt shaft by simply screwing and fastening the nut to the bolt shaft as usual without additionally performing a separate shear clip or the like. Further, it is possible to easily confirm the reliable construction by visually or tactilely confirming the protrusion of the locking portion, and it is possible to further improve the certainty of preventing the nut from coming off.
【図１】（ａ）は本発明の実施例に係るボルトの平面
図、（ｂ）はその正面図、（ｃ）はその側面図である。1A is a plan view of a bolt according to an embodiment of the present invention, FIG. 1B is a front view thereof, and FIG. 1C is a side view thereof.
【図２】（ａ）は図１に示すボルトに螺合するナットの
縦断面図、（ｂ）は図１に示すボルトの要部縦断面図、
（ｃ）は（ｂ）の側面図である。2A is a vertical sectional view of a nut screwed with the bolt shown in FIG. 1, and FIG. 2B is a longitudinal sectional view of a main part of the bolt shown in FIG.
(C) is a side view of (b).
【図３】（ａ）〜（ｃ）は図１に示すボルトにナットを
螺合・締結する課程を示す縦断面図である。3A to 3C are vertical sectional views showing a process of screwing and fastening a nut to the bolt shown in FIG.
【図４】図１に示すボルトの施工例を示す断面図であ
る。FIG. 4 is a cross-sectional view showing a construction example of the bolt shown in FIG.
【図５】（ａ），（ｂ）は図１に示すボルトの製造工程
を示す説明図である。5A and 5B are explanatory views showing a manufacturing process of the bolt shown in FIG.
１ ボルト（ナット脱落防止機能を有するボルト） ３ ボルト軸 ３２ 収容部 ４ オネジ ５ ナット脱落防止部（脱落防止部材） ５０ 基部 ５２ 弾性変形部 ５３ 係止部 ５３ａ 係止部の先端 ６ ナット ６１ ナットの軸方向外方の端面 1 bolt (bolt with nut drop prevention function) 3 bolt shaft 32 accommodation 4 male 5 Nut fall prevention part (fall prevention member) 50 base 52 Elastic deformation part 53 Locking part 53a Tip of locking part 6 nuts 61 End face of nut axially outward
Claims (3)
ト軸に取り付けられたナット脱落防止部とを備え、該ナ
ット脱落防止部は、通常時はボルト軸に螺着されるナッ
トのメネジ内径よりも径方向外方に突出してナットのボ
ルト軸からの脱落を防止するとともに、前記突出部を径
方向内方に押し込むことでナットのメネジ内径よりも小
径となるように弾性変形可能であることを特徴とするナ
ット脱落防止機能を有するボルト。1. A bolt shaft having a male thread formed thereon, and a nut drop prevention part attached to the bolt shaft, wherein the nut drop prevention part is a female screw inner diameter of a nut that is normally screwed to the bolt shaft. It is possible to elastically deform so that it is smaller than the inner diameter of the female thread of the nut by protruding outwards in the radial direction and preventing the nut from falling off the bolt shaft, and by pushing the protrusion inward in the radial direction. A bolt with a nut drop prevention function.
ト軸に取り付けられてナットを係止する弾性変形可能な
ナット脱落防止部とを備え、該ナット脱落防止部は、ボ
ルト軸にナットを螺合させて軸方向内方へ移動させる
と、ナットの移動により弾性変形してナットの軸方向内
方への移動を許容し、ナット脱落防止部を越えてナット
が軸方向内方へ移動した後はナットによる弾性変形が解
除されて復元し、ナットを係止してナットの緩みによる
軸方向外方への移動を阻止することを特徴とするナット
脱落防止機能を有するボルト。2. A bolt shaft having a male screw formed thereon, and an elastically deformable nut dropout prevention part attached to the bolt shaft to lock a nut, wherein the nut dropout prevention part has a nut on the bolt shaft. When they are screwed together and moved inward in the axial direction, they are elastically deformed by the movement of the nut, allowing the nut to move inward in the axial direction, and the nut has moved inward in the axial direction beyond the nut drop prevention part. After that, the elastic deformation by the nut is released and restored, and the nut is locked to prevent the nut from loosening to prevent outward movement in the axial direction.
端部の軸中央から先端側へ向けて延出する基部と、該基
部に続いてＣ字状に折り返して湾曲した弾性変形部と、
該弾性変形部に続いてボルト軸の軸方向内方へ向かうに
連れてボルト軸の中心軸との間隔が広がる直線状の係止
部とを一体化して形成され、該係止部はオネジの形成部
位に軸方向へ削設された収容部の内部に位置すると共に
係止部の先端はオネジから突出し、該係止部は弾性変形
部の弾性変形によって収容部へ退入可能とされており、
前記係止部は、ナットの軸方向内方への移動により押圧
され収容部の内部へ退入してナットの軸方向内方への移
動を許容し、ナットが係止部を越えて軸方向内方へ移動
してナットによる押圧が解除されると、弾性変形部の復
元力によってオネジから突出してナットの軸方向外方の
端面を係止することを特徴とする請求項１又は２に記載
のナット脱落防止機能を有するボルト。3. The nut disengagement prevention portion includes a base portion extending from the shaft center of the tip end portion of the bolt shaft toward the tip end side, and an elastically deformable portion that is bent back into a C-shape after the base portion.
The elastically deforming portion is formed integrally with a linear locking portion that widens the distance from the central axis of the bolt shaft as it goes inward in the axial direction of the bolt shaft. It is located inside the accommodating portion that is axially cut at the formation site, the tip of the locking portion projects from the male screw, and the locking portion is capable of retracting into the accommodating portion by elastic deformation of the elastically deforming portion. ,
The locking portion is pressed by the movement of the nut inward in the axial direction and retracts into the accommodation portion to allow the movement of the nut inward in the axial direction. 3. When moving inward and releasing the pressing force of the nut, the restoring force of the elastically deforming portion projects from the male screw and locks the axially outer end surface of the nut. A bolt that has the function of preventing the nut from falling off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001354683A JP3621064B2 (en) | 2001-11-20 | 2001-11-20 | Bolt with nut drop prevention function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001354683A JP3621064B2 (en) | 2001-11-20 | 2001-11-20 | Bolt with nut drop prevention function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003156026A true JP2003156026A (en) | 2003-05-30 |
| JP3621064B2 JP3621064B2 (en) | 2005-02-16 |
Family
ID=19166496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001354683A Expired - Fee Related JP3621064B2 (en) | 2001-11-20 | 2001-11-20 | Bolt with nut drop prevention function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3621064B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006336676A (en) * | 2005-05-31 | 2006-12-14 | Daiko So | Clamp capable of preventing nut joined to bolt from coming off |
| JP2008133943A (en) * | 2006-04-26 | 2008-06-12 | Horii Korea Kk | Clamp |
| JP2011000049A (en) * | 2009-06-18 | 2011-01-06 | Makita Corp | Fall preventing structure of protector fixing tool of horticulture tool |
| JP2014202314A (en) * | 2013-04-08 | 2014-10-27 | 松本重工業株式会社 | Locking bolt, fastener using the same and manufacturing method of locking bolt |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369038A (en) * | 2016-10-25 | 2017-02-01 | 深圳市天龙金属制品有限公司 | Anti-theft screw using threaded rod for encipherment |
-
2001
- 2001-11-20 JP JP2001354683A patent/JP3621064B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006336676A (en) * | 2005-05-31 | 2006-12-14 | Daiko So | Clamp capable of preventing nut joined to bolt from coming off |
| JP2008133943A (en) * | 2006-04-26 | 2008-06-12 | Horii Korea Kk | Clamp |
| JP2011000049A (en) * | 2009-06-18 | 2011-01-06 | Makita Corp | Fall preventing structure of protector fixing tool of horticulture tool |
| US8549758B2 (en) | 2009-06-18 | 2013-10-08 | Makita Corporation | Coupling apparatus for coupling blade protector to tool body of gardening tool |
| JP2014202314A (en) * | 2013-04-08 | 2014-10-27 | 松本重工業株式会社 | Locking bolt, fastener using the same and manufacturing method of locking bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3621064B2 (en) | 2005-02-16 |
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