JP2016035315A - Lock screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock screw preventing looseness of a screw fastened to a portion onto which vibrations or shocks are performed over a long term.SOLUTION: A lock screw is a fastening screw component constituted by combining a bolt 1, a spring washer 2 and a nut 3. A shank 4 of a spiral shape of the bolt 1 comprises threads 5a and 5b at both sides, and a cut-off part 6a and a cut-off part of the back surface side, of such a shape that part of the threads is cut off in the direction parallel to the center line of a shaft. The spring washer 2 has an outer circumference formed in a circular shape and has an inner circumference formed in an approximately elliptic shape, therefore, can be fit to the shank 4 of the bolt 1, however, cannot be rotated in the singly twisted direction with respect to the bolt 1. The nut 3 is formed of a plurality of recessed groove parts 9 on the surface of a seating surface 8. One edge part 7b of a break part of the spring washer 2 having elasticity is warped to the nut 3 side, when being fastened by the nut 3, one edge part 7b of the break part of the spring washer 2 is fit into the groove part 9 of the nut 3 and, therefore, the looseness prevention can be performed.SELECTED DRAWING: Figure 1

Description

本発明は振動下に於ける緩みの発生を抑える緩み防止ネジに関するものである。   The present invention relates to a loosening prevention screw that suppresses the occurrence of loosening under vibration.

従来、ネジは被締結部材を締め付けても振動等の要因で緩んでしまう。この緩みを防ぐために、ナットのネジ山部分にナイロン樹脂をコーティングしたもの、あるいは、ナットを二重にして締め付けていた。   Conventionally, a screw is loosened due to vibration or the like even if a member to be fastened is tightened. In order to prevent this loosening, the nut thread is coated with nylon resin, or the nut is doubled and tightened.

その他に、特許文献１にナットの座面の表面に凹部が形成されたものが開示されている。特許文献２に緩み防止結合体のバネ座金が開示されている。特許文献３のバネ座金は、内径をボルトの外形と同型にしてあり、さらに、固定用のツメを設けてナット締め付け後にこの固定用ツメを起こしてナットの縦溝に押し込むようにしたものが開示されている。特許文献４に内部にネジ孔が形成され、かつ、一方の前記座面のネジ孔の円縁に溝が形成されたロックナットが開示されている。特許文献５にナットの座面に溝を設けて、このナットとナットの間にスプリングを設けたもの、あるいは、特許文献７に両ナットの間に環状部材を介在させた固定状態を維持するネジのロック構造が開示されている。特許文献９にネジ山の頂部及び側面とネジ溝とをボルトの長手方向に帯状に除去した形状の凹条を設けたものが開示されている。特許文献１０にアンカー定着用座金が開示されている。   In addition, Patent Document 1 discloses a structure in which a recess is formed on the surface of the seat surface of the nut. Patent Document 2 discloses a spring washer of a loosening prevention combined body. The spring washer disclosed in Patent Document 3 has an inner diameter that is the same as the outer shape of the bolt, and further includes a fixing claw, and after tightening the nut, the fixing claw is raised and pushed into the vertical groove of the nut. Has been. Patent Document 4 discloses a lock nut in which a screw hole is formed inside, and a groove is formed in a circle edge of the screw hole of one of the seating surfaces. Patent Document 5 is provided with a groove on the seat surface of the nut and a spring is provided between the nuts, or Patent Document 7 is a screw that maintains a fixed state in which an annular member is interposed between both nuts. A lock structure is disclosed. Patent Document 9 discloses a structure in which a concave portion having a shape obtained by removing the top and side surfaces of a screw thread and a screw groove in a strip shape in the longitudinal direction of the bolt is disclosed. Patent Document 10 discloses an anchor fixing washer.

特開２０１３−９６５２１号公報JP 2013-96521 A 特開２０１２−１０２８６６号公報JP 2012-102866 A 特開２０１０−１３９０５８号公報JP 2010-139058 A 特開２００５−０６９２５４号公報JP 2005-0669254 A 特開２００４−１６９９０２号公報JP 2004-169902 A 特開２００１−５９５１３号公報JP 2001-59513 A 特開２０００−２４０６３３号公報JP 2000-240633 A 特開平１０−６１６４５号公報JP-A-10-61645 特開平９−１８９３１９号公報JP-A-9-189319 意願平９−７７４１０号公報Japanese Patent Application No. 9-77410

しかしながら、上記特許文献１〜１０に開示されたものは製造面で手間がかかるためコスト高になる。また、被締結部材の締結作業をする場合には手間と時間が係る。   However, since those disclosed in Patent Documents 1 to 10 are time-consuming in production, the cost is high. In addition, labor and time are involved when fastening the fastened member.

その為、本発明の根底をなす課題は、製造コストも安価で簡単な作業で確実に締め付けることができる緩み防止ネジを提供することを目的とする。   Therefore, an object underlying the present invention is to provide a loosening prevention screw that can be reliably tightened with a simple operation at a low manufacturing cost.

そこで本発明にあっては、上記課題を解決するために講じた本発明の手段は次のとおりである。雄ネジとバネ座金と雌ネジとが組み合った締結部品であって、前記雄ネジは、軸部の両脇の螺旋状ネジ山の一部を長手方向に切除した形状の切除部を有し、弾性を有する前記バネ座金は、内周を略長円形状とし、尚且つ、前記切除部に隣接する付近の内縁から対峙する内縁までの長さを、前記切除部から背面の切除部までの長さより長く、且つ、前記ネジ山の頂から背面のネジ山の頂までの長さより短くした形状を有し、また、該バネ座金の切れ目部分は一端部が前記雌ネジ側へ反った形状を有し、前記雌ネジは、座面の複数個所に凹状の溝部を有し、該溝部に前記バネ座金の一端部が嵌まり込む形状を備えたことを特徴とする緩み防止ネジである。   Therefore, in the present invention, the means of the present invention taken in order to solve the above problems are as follows. A fastening part in which a male screw, a spring washer, and a female screw are combined, and the male screw has a cut-out portion in a shape in which a part of a spiral thread on both sides of the shaft portion is cut in the longitudinal direction, The elastic spring washer has a substantially oval inner periphery, and the length from the inner edge adjacent to the cut portion to the opposite inner edge is the length from the cut portion to the cut portion on the back surface. Longer than the length of the screw thread and shorter than the length of the screw thread on the back surface, and the cut portion of the spring washer has a shape in which one end is warped toward the female screw. The female screw is a loosening prevention screw characterized by having concave groove portions at a plurality of locations on the seating surface, and having a shape in which one end portion of the spring washer is fitted into the groove portion.

これによれば、前記バネ座金の外周を円形状にして、内周を雄ネジの前記軸部の円周と同型の略長円形状にしている。前記軸部の前記ネジ山の頂から背面のネジ山の頂までの幅よりも前記バネ座金の内縁から対峙する内縁までの幅を狭くした区域を設けたことで、該バネ座金は、前記雄ネジの軸部に嵌めたり取り外したりは出来るが単独で捩る方向へは回転しないようになっている。さらに、該バネ座金の切れ目部分は、前記雌ネジを緩める方向側の前記一端部が前記雌ネジ側へ反っている。該一端部が、前記雌ネジの座面に複数ある前記溝部の一つに嵌まり込むようになっている。 According to this, the outer periphery of the spring washer has a circular shape, and the inner periphery has a substantially oval shape that is the same type as the circumference of the shaft portion of the male screw. By providing an area in which the width from the inner edge of the spring washer to the inner edge of the spring washer is narrower than the width from the top of the thread of the shaft to the top of the back thread, It can be inserted into and removed from the screw shaft, but it does not rotate in the direction of twisting alone. Further, in the cut portion of the spring washer, the one end portion in the direction of loosening the female screw is warped toward the female screw side. The one end is fitted into one of the plurality of grooves on the seat surface of the female screw.

前記雄ネジの切除部を三方の側面に設けた場合、螺旋状ネジ山の部分が少なくなり、このネジ山に強い圧力がかかった時にネジ山の強度不足が生じる恐れがある。また、該切除部を一方のみの側面に設けた場合、雄ネジにバネ座金を嵌める時、最大時には、およそ３６０度捻りながら嵌めるようになるため手間取る。そこで該切除部を両脇の二方の側面に設けることで最大時でも、およそ１８０度捻るだけで嵌めることができるため手間取ることがなくスムーズにネジの締め付けを行うことができる。 When the cut portion of the male screw is provided on three side surfaces, the helical thread portion is reduced, and there is a risk that the strength of the screw thread is insufficient when a strong pressure is applied to the screw thread. Further, when the cut portion is provided on only one side surface, when the spring washer is fitted to the male screw, it is troublesome because it can be fitted while twisting approximately 360 degrees at the maximum. Therefore, by providing the cut portions on the two side surfaces on both sides, the screw can be fitted by only twisting about 180 degrees at the maximum, so that the screw can be tightened smoothly without taking time and effort.

前記雌ネジは、前記バネ座金に接する側の座面の表面に複数の凹状の溝部を有している。例えば、該座面を上向きにした場合の該溝部は、雌ネジを緩める方向側から締め付け方向へ緩やかな下り勾配の斜面と、さらに、下った位置から鋭角な方向へ上り勾配の斜面を備えた形状にするのが望ましい。 The female screw has a plurality of concave grooves on the surface of the seating surface on the side in contact with the spring washer. For example, the groove portion when the seat surface is faced upward includes a slope having a gentle downward slope from the direction of loosening the female screw to the tightening direction, and a slope having an upward slope from the lowered position to an acute angle. It is desirable to have a shape.

又、締め付けた後にネジを緩める場合には、前記雌ネジの前記溝部に嵌まり込んだ前記バネ座金の前記一端部を該溝部から外す必要がある。その場合、前記バネ座金の前記一端部を被締結部材側へ押しやった状態で緩める方向へ捩じると嵌まりを脱して外すことができる。このため、前記バネ座金の外縁の外径を大きくして前記雌ネジの外壁から外側へはみ出した形状にするのが望ましい。 Further, when the screw is loosened after tightening, it is necessary to remove the one end portion of the spring washer fitted into the groove portion of the female screw from the groove portion. In that case, when the one end of the spring washer is pushed toward the fastened member side and twisted in the loosening direction, the fit can be removed and removed. For this reason, it is desirable to increase the outer diameter of the outer edge of the spring washer so that it protrudes outward from the outer wall of the female screw.

前記バネ座金は前記雄ネジの螺旋状のネジ山とネジ山の挟間にかまれない厚みを備えている。 The spring washer has a thickness that cannot be caught between the spiral threads of the male screw.

被締結部材を、前記雄ネジと前記バネ座金と前記ナットを組み合わせた前記緩み防止ネジで締め付けると振動等でネジが緩み方向へ回転しようとしても前記バネ座金の弾性反発力により前記バネ座金の前記一端部が前記雌ネジの前記溝部にはまり込むため緩み回転が阻止され強度の維持が図られる。 When the member to be fastened is tightened with the loosening prevention screw that combines the male screw, the spring washer and the nut, even if the screw tries to rotate in the loosening direction due to vibration or the like, the spring washer of the spring washer is caused by the elastic repulsive force of the spring washer. Since one end part fits into the groove part of the female screw, loose rotation is prevented and strength is maintained.

本発明によれば、被締結部材の締め付けは、雄ネジにバネ座金を嵌め雌ネジで締め付けるだけで短時間に締め付けを完了して緩み防止を図り振動や衝撃により緩んだネジの脱落を確実に防止することができる。また、製造する場合も技術的に簡単にできる。   According to the present invention, the fastened member can be fastened simply by fitting a spring washer to the male screw and tightening with the female screw in a short time to prevent loosening and to prevent the loosened screw from dropping due to vibration or impact. Can be prevented. Also, it can be technically simplified when manufacturing.

本発明の実施例の緩み防止ネジの概略的な構成図である。It is a schematic block diagram of the loosening prevention screw of the Example of this invention. 本発明の実施例の底部から見たボルトの底面図である。It is a bottom view of the volt | bolt seen from the bottom part of the Example of this invention. 本発明の実施例のバネ座金の平面図である。It is a top view of the spring washer of the example of the present invention. 本発明の実施例のバネ座金の正面図である。It is a front view of the spring washer of the example of the present invention. 本発明の実施例のナットの座面の平面図である。It is a top view of the bearing surface of the nut of the Example of this invention.

本発明の実施の形態について、図面に従って詳細に説明すれば、図１は、本発明の実施例を表す一般的な形態の概略図を示すが、被締結部材１１を締結するための雄ネジのボルト１は、頭部１０と軸部４で形成され、雌ネジのナット３とねじ合う形状を有する。軸部４には、両側に螺旋状のネジ山５ａ、５ｂを有し、前面はネジ山の一部を頭部１０近傍から末端方向へ切削状に切除した切除部６ａを有し、また、背面にも同様に切除部６ｂを有している。緩み防止ネジＳは、ボルト１とバネ座金２とナット３から成り、バネ座金２の切れ目部分の一端部７ｂはナット３側へ反った形状を示していて、該一端部７ｂがナット３の溝部９に嵌まり込むようになっている。 The embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic view of a general form representing an embodiment of the present invention, and shows a male screw for fastening a member 11 to be fastened. The bolt 1 is formed of a head portion 10 and a shaft portion 4, and has a shape that fits with a nut 3 of a female screw. The shaft portion 4 has spiral threads 5a and 5b on both sides, and the front surface has a cut portion 6a in which a part of the thread is cut in a cutting shape from the vicinity of the head 10 toward the distal end. Similarly, the rear surface has a cut portion 6b. The loosening prevention screw S includes a bolt 1, a spring washer 2, and a nut 3, and one end portion 7 b of the cut portion of the spring washer 2 is warped toward the nut 3, and the one end portion 7 b is a groove portion of the nut 3. 9 fits in.

図２は、ボルト１の底面から見た図である。軸部４の両側面には螺旋状ネジ山を切除した切除部６ａと背面の切除部６ｂ及びネジ山５ａとネジ山５ｂが形成されている。 FIG. 2 is a view as seen from the bottom surface of the bolt 1. On both side surfaces of the shaft portion 4, a cut portion 6 a obtained by cutting a spiral screw thread, a cut portion 6 b on the back surface, and a screw thread 5 a and a screw thread 5 b are formed.

図３のバネ座金２は、弾力性を備えている。また、外周を円形にした外縁１３を設けてあり、内周は略長円形にしてある。内周の幅の狭い付近で対峙する内縁１２ａから１２ｂまでの幅は、図２に示すネジ山５ａから背面のネジ山５ｂまでの幅より狭く、尚且つ、切除部６ａから背面の切除部６ｂまでの幅よりも広くしている。内周を略長円形状にすることでボルト１に嵌めることができるが螺合方向へは回転しないようになっている。該バネ座金２の外周の外縁１３をナット３の外周面よりも外側にはみ出した形状にするのが望ましく、緩める場合に、はみ出した箇所を押さえるために設けたものである。 The spring washer 2 in FIG. 3 has elasticity. An outer edge 13 having a circular outer periphery is provided, and the inner periphery is substantially oval. The width from the inner edges 12a to 12b facing each other in the vicinity of the narrow inner circumference is narrower than the width from the screw thread 5a to the screw thread 5b on the back surface shown in FIG. It is wider than the width up to. By making the inner circumference into a substantially oval shape, it can be fitted to the bolt 1 but is not rotated in the screwing direction. It is desirable that the outer edge 13 of the outer periphery of the spring washer 2 be formed so as to protrude outward from the outer peripheral surface of the nut 3, and is provided to suppress the protruding portion when loosened.

図４のバネ座金２は、切れ目部分の一端部７ａと一端部７ｂが上下に違える方向に反った形状にしている。また、厚みはボルト１の螺旋の幅より厚くしている。図５のナット３の座面８には、三か所に溝部９が形成されている。該溝部９にバネ座金２の一端部７ｂが嵌まり込むように形成されている。 The spring washer 2 in FIG. 4 has a shape in which one end 7a and one end 7b of the cut portion are warped in different directions. Further, the thickness is larger than the spiral width of the bolt 1. Grooves 9 are formed in three places on the seat surface 8 of the nut 3 in FIG. One end portion 7 b of the spring washer 2 is formed in the groove portion 9.

被締結部材１１の締結はボルト１の頭部１０とバネ座金２の間に被締結部材１１を位置させナット３を螺合して締め付けるだけでよい。締め付け完了時には押さえつけられたバネ座金２の一端部７ｂは、ナット３の溝部９に弾性の反発力で嵌まり込むようになり、また、嵌まり込まなくてもナット３を少し緩める方向に捩じり戻るとバネ座金２の一端部７ｂは弾性の反発力で元に戻ろうとしてナット３の溝部９に取り付き嵌まるようになる。また緩める場合には、バネ座金２の一端部７ｂを逆方向に押圧した状態でナット３を緩める方向へ捩じることで緩めることが可能である。また、専用工具を用いれば簡単に緩めることができる。   The fastened member 11 may be fastened simply by positioning the fastened member 11 between the head 10 of the bolt 1 and the spring washer 2 and screwing the nut 3 together. The one end 7b of the spring washer 2 that is pressed down when the tightening is completed is fitted into the groove 9 of the nut 3 by an elastic repulsive force. When returned, the one end portion 7b of the spring washer 2 is attached to the groove portion 9 of the nut 3 so as to return to the original position by an elastic repulsive force. Further, in the case of loosening, it is possible to loosen by twisting the nut 3 in the loosening direction while pressing the one end 7b of the spring washer 2 in the reverse direction. Moreover, if a special tool is used, it can be easily loosened.

又、本発明は、上記実施の形態や実施例には限定されるものではなく、特許請求の範囲において、各部材の形状や素材等、適宜変更可能である。 Further, the present invention is not limited to the above-described embodiments and examples, and the shape and material of each member can be appropriately changed within the scope of the claims.

Ｓ 緩み防止ネジ
１ ボルト
２ バネ座金
３ ナット
４ 軸部
５ａ ５ｂ ネジ山
６ａ ６ｂ 切除部
７ａ ７ｂ 一端部
８ 座面
９ 溝部
１０ 頭部
１１ 被締結部材
１２ａ １２ｂ 内縁
１３ 外縁 S Loosening prevention screw 1 Bolt 2 Spring washer 3 Nut 4 Shaft 5a 5b Thread 6a 6b Cut part 7a 7b One end
8 Seat surface 9 Groove 10 Head 11 Fastened member
12a 12b Inner edge 13 Outer edge

Claims (1)

雄ネジとバネ座金と雌ネジとが組み合った締結部品であって、前記雄ネジは、軸部の両脇の螺旋状ネジ山の一部を長手方向に切除した形状の切除部を有し、弾性を有する前記バネ座金は、内周を略長円形状とし、尚且つ、前記切除部に隣接する付近の内縁から対峙する内縁までの長さを、前記切除部から背面の切除部までの長さより長く、且つ、前記ネジ山の頂から背面のネジ山の頂までの長さより短くした形状を有し、また、該バネ座金の切れ目部分は一端部が前記雌ネジ側へ反った形状を有し、前記雌ネジは、座面の複数個所に凹状の溝部を有し、該溝部に前記バネ座金の一端部が嵌まり込む形状を備えたことを特徴とする緩み防止ネジ。 A fastening part in which a male screw, a spring washer, and a female screw are combined, and the male screw has a cut-out portion in a shape in which a part of a spiral thread on both sides of the shaft portion is cut in the longitudinal direction, The elastic spring washer has a substantially oval inner periphery, and the length from the inner edge adjacent to the cut portion to the opposite inner edge is the length from the cut portion to the cut portion on the back surface. Longer than the length of the screw thread and shorter than the length of the screw thread on the back surface, and the cut portion of the spring washer has a shape in which one end is warped toward the female screw. The female screw has a concave groove at a plurality of locations on the seat surface, and has a shape in which one end of the spring washer is fitted into the groove.