JP2006266491A

JP2006266491A - Non-loosening bolt and nut

Info

Publication number: JP2006266491A
Application number: JP2005117493A
Authority: JP
Inventors: Hiroyuki Yoneima; 博之米今
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-03-17
Filing date: 2005-03-17
Publication date: 2006-10-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt and a nut with a structure capable of truly preventing them from loosening by reasonably overcoming a loosening principle although the bolt and nut have a fate of loosening in terms of the structure thereof. <P>SOLUTION: A part or a whole-width part formed into a step-like shape in a screw thread direction, that is, a spiral direction are formed on one of two screw thread contact surfaces bearing fastening force of the bolt and nut. The upper surface of the step is formed by providing a gradient larger than the spiral gradient of the screw in relation to the cross section in the spiral direction. The other contact surface is formed equally to the step-like shape or is formed into a structure having a groove or a slit for fitting a projection becoming a corner of the step thereto. The screw thread contact surface is rotatable in the fastening direction but can not be rotated in the loosening direction because of being hooked in terms of the shape thereof. By such a structure, a loosening prevention function can be made to naturally work by making the fastening force act on the screw thread contact surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はボルト・ナットに関する。 The present invention relates to a bolt and a nut.

従来の緩み防止技術はネジ山同士が噛み合う際の摩擦力の増大を図る物が大半をしめているが、これではネジの緩む原理は働いたままであり、緩み防止は根本的に解決できていない。 The conventional loosening prevention techniques are mostly intended to increase the frictional force when the screw threads are engaged with each other, but in this case, the principle of loosening the screw still works, and the prevention of loosening has not been fundamentally solved.

ネジはどうして緩むかを考えた場合、ネジ山はボルト軸直交面に対し緩やかな螺旋傾きを有しているからである。ネジの締め付け力を増してボルト軸力を増大させた時、ボルト・ナットのネジ山接触面には強い圧力が生じ、この結果接触面をずらすまいとする摩擦抵抗性も増大するが、ネジ山は螺旋傾きを持っているから軸力はこの傾きに沿った分力も必ず発生させている。これがネジを緩ませようとする原動力となっている。ネジに螺旋傾きがある限り緩むのは自然の原理である。この原理を合理的に克服して真に緩まない構造をもつボルト・ナットを提供することが目的である。 This is because the screw thread has a gentle spiral inclination with respect to the plane perpendicular to the bolt axis when considering why the screw is loosened. When the tightening force of the screw is increased to increase the bolt axial force, a strong pressure is generated on the thread contact surface of the bolt and nut. Since it has a spiral inclination, the axial force always generates a component force along this inclination. This is the driving force to loosen the screw. It is a natural principle to loosen as long as the screw has a spiral inclination. It is an object to provide a bolt and nut having a structure that does not loosen by reasonably overcoming this principle.

ボルト・ナットの締め付け力を受け持つネジ山接触面２面のうち１面は螺旋方向に階段状となる部分または全幅を形成し、階段上面は螺旋方向断面に関しネジの螺旋傾きより傾きを大きく形成する。もう一方の接触面は前記階段状に等しく形成するか、あるいは前記階段の角となる突起が嵌合する溝、またはスリットを形成する。ネジ山接触面は締め付け方向には回転可能であるが緩み方向には形状的にひっかかり回転できなくなる。 One of the two screw thread contact surfaces responsible for the bolt / nut tightening force forms a stepped portion or full width in the spiral direction, and the upper surface of the staircase forms a slope larger than the spiral inclination of the screw with respect to the cross section in the spiral direction. . The other contact surface is formed to be equal to the stepped shape, or a groove or a slit into which a projection that becomes the corner of the step is fitted. The thread contact surface can be rotated in the tightening direction but cannot be rotated due to the shape of the screw in the loose direction.

締め付け力をネジ山接触面に作用させることで緩み防止機能を自然に働かせることができる。締め付け力が少しでもある限りネジ山接触面では階段状の突起同士がひっかかり、あるいは突起が溝にひっかかるのでボルト・ナットは互いに緩まない。弱い締め付け力でも緩みを防止できるという利点がある。すなわち締め付け力を自在に調整できる特徴があり、はさみのようにボルト・ナットに挟まれている物自身が動く物には特に利点がある。また、従来のネジ構造ではバネ座金を入れた場合、このバネの反発力により緩みが生じやすくなっていたのであるが本発明においてはバネ座金は非常に有効な手段となり本来の機能を発揮できる。ネジを強く締めすぎたために分解不能となることも回避できる。 By applying a tightening force to the thread contact surface, the loosening prevention function can be made to work naturally. As long as there is even a slight tightening force, the stepped projections are caught on the thread contact surface, or the bolts and nuts are not loosened because the projections are caught in the groove. There is an advantage that loosening can be prevented even with a weak tightening force. That is, there is a feature that the tightening force can be freely adjusted, and there is a particular advantage in a thing in which a thing sandwiched between bolts and nuts such as scissors moves itself. In addition, in the conventional screw structure, when a spring washer is inserted, loosening is likely to occur due to the repulsive force of the spring. However, in the present invention, the spring washer becomes a very effective means and can exhibit its original function. It can also be avoided that the screws cannot be disassembled due to overtightening of the screws.

BEST MODE FOR CARRYING OUT THE INVENTION

階段は短い間隔でネジ山面の最初から終わりまで配置するのが望ましい。 It is desirable to arrange the stairs at short intervals from the beginning to the end of the thread surface.

は、ネジ山螺旋方向の断面図である。These are sectional drawings of a screw thread spiral direction.

Claims

One of the two screw thread contact surfaces responsible for tightening the bolts and nuts is formed with a stepped portion or full width in the spiral direction, and the upper surface of the staircase is related to the spiral cross section. Bolts and nuts characterized in that they are formed with a large inclination, and the other contact surface is equally formed in the step shape, or a groove or slit is formed into which a projection that becomes the corner of the step is fitted. .