JP2010159847A - Snap pin - Google Patents

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JP2010159847A
JP2010159847A JP2009003454A JP2009003454A JP2010159847A JP 2010159847 A JP2010159847 A JP 2010159847A JP 2009003454 A JP2009003454 A JP 2009003454A JP 2009003454 A JP2009003454 A JP 2009003454A JP 2010159847 A JP2010159847 A JP 2010159847A
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leg
shaft
leg portion
snap pin
distal
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JP5234635B2 (en
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Masato Okawa
正人 大川
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Togo Seisakusho Corp
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Togo Seisakusho Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent a snap pin from falling off a shaft. <P>SOLUTION: A first leg section 20 is inserted into a hole 51 formed in the shaft 50, and a second leg section 30 includes a base end-side leg portion 31 extending oppositely to the first leg section 20 from a turning-back portion 40 and an end-side leg portion 32 bent from the extended end of the base end-side leg portion 31 to the side of the first leg section 20. The end side-leg portion 32 is disposed obliquely with respect to a virtual plane P including the base end-side leg portion 31 and first leg section 20. In a process of inserting the first leg section 20 into the hole 51, the end side-leg portion 32 is in slidable contact with the peripheral surface of the shaft 50 and twisted in a direction separating from the virtual plane P while the base end-side leg portion 31 is opened and deformed with the turning-back portion 40 as a fulcrum. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、スナップピンに関する。   The present invention relates to a snap pin.

特許文献１には、従来のスナップピンが開示されている。このものは、第１、第２脚部と、これらの一端同士を連結する折り返し部とを備え、第１脚部がシャフトに形成された孔に挿入され、第２脚部及び折り返し部がシャフトの外周面の外側に配され、第２脚部の開き動作を伴ったあとシャフトに弾性的に取り付けられる。第２脚部は、シャフトの外周面に沿って配される湾曲部と、その先端側のストッパ部とからなり、シャフトへの組付過程では、湾曲部が折り返し部を支点として上方へ弾性的に開き変形し、シャフトへの正規組付時には、湾曲部が弾性復帰するとともに、ストッパ部の先端がシャフトの外周面を弾性的に係止して、スナップピンのシャフトからの抜け止めがなされる。   Patent Document 1 discloses a conventional snap pin. This is provided with first and second leg portions and a turn-back portion for connecting one end thereof, the first leg portion is inserted into a hole formed in the shaft, and the second leg portion and the turn-back portion are shafts. And is elastically attached to the shaft after the second leg is opened. The second leg portion is composed of a curved portion arranged along the outer peripheral surface of the shaft and a stopper portion on the tip side thereof. In the assembly process to the shaft, the curved portion is elastically upward with the folded portion as a fulcrum. At the time of regular assembly to the shaft, the curved portion is elastically restored, and the tip of the stopper portion elastically locks the outer peripheral surface of the shaft to prevent the snap pin from coming off from the shaft. .

折り返し部は、中心角が１８０度を超える円弧状をなし、湾曲部の開き動作の支点位置をシャフトから離れた位置に設定してなる。これにより、第２脚部の開き角度が小さく抑えられ、第２脚部の開き動作に伴う組付荷重が過大になるのが回避されるようになっている。
実開平７−４２８７５公報 The folded portion has an arc shape with a center angle exceeding 180 degrees, and the fulcrum position of the opening operation of the bending portion is set at a position away from the shaft. Thereby, the opening angle of a 2nd leg part is suppressed small, and it is avoided that the assembly | attachment load accompanying the opening operation | movement of a 2nd leg part becomes excessive.
Japanese Utility Model Publication No. 7-42875

ところで、上記の構成では、折り返し部の長さが長くなってスナップピン全体が大きくなるという事情がある。一方、折り返し部をシャフトに近づけてその長さを短くすると、第２脚部の開き角度が増加し、組付荷重が大きくなって作業性が悪化してしまう。つまり、上記の構成では、折り返し部をシャフトに近づければ、組付作業性が犠牲になり、逆に、折り返し部をシャフトから遠ざければ、コンパクト性が犠牲になり、コンパクト性と組付作業性の両特性を満足させるのが難しいという問題がある。   By the way, in said structure, there exists a situation that the length of a folding | returning part becomes long and the whole snap pin becomes large. On the other hand, when the folded portion is brought closer to the shaft and the length thereof is shortened, the opening angle of the second leg portion is increased, the assembly load is increased, and workability is deteriorated. In other words, in the above configuration, assembling work is sacrificed if the folded part is brought closer to the shaft, and conversely, if the folded part is moved away from the shaft, compactness is sacrificed, and compactness and assembling work are performed. There is a problem that it is difficult to satisfy both characteristics of sex.

本発明は上記のような事情に基づいて完成されたものであって、コンパクトでかつ組付作業性に優れたスナップピンを提供することを目的とする。   The present invention has been completed based on the above circumstances, and an object thereof is to provide a snap pin that is compact and excellent in assembling workability.

上記の目的を達成するための手段として、請求項１の発明は、第１、第２脚部と、これらの一端同士を連結する折り返し部とを備え、前記第１脚部は、シャフトに形成された孔に挿入され、前記第２脚部は、前記シャフトの外周面の外側に配され、かつ、前記折り返し部から前記第１脚部と対向して延びる基端側脚部と、前記基端側脚部の延出端から前記第１脚部側に屈曲される先端側脚部とを有し、前記第１脚部が前記シャフトに正規挿入された状態で、前記先端側脚部が前記シャフトの外周面を弾性的に係止することにより、前記第１脚部の前記シャフトからの抜け出しが規制されるスナップピンであって、前記先端側脚部は、前記基端側脚部と前記第１脚部とを含む仮想平面に対して斜めに配され、前記第１脚部の前記シャフトへの挿入過程では、前記シャフトの外周面を摺接することにより、前記第１脚部に対してねじれる方向に開き変形する構成としたところに特徴を有する。   As a means for achieving the above object, the invention of claim 1 includes first and second leg portions and a turn-back portion for connecting the one ends thereof, and the first leg portion is formed on the shaft. The second leg portion is disposed outside the outer peripheral surface of the shaft, and extends from the folded portion to face the first leg portion, and the base leg portion. A distal leg that is bent toward the first leg from the extended end of the end leg, and the distal leg is inserted into the shaft in a state where the first leg is normally inserted. A snap pin in which the outer periphery of the shaft is elastically locked to restrict the first leg from coming out of the shaft, and the distal leg is connected to the proximal leg. The first leg is disposed obliquely with respect to a virtual plane including the first leg, and the first leg is inserted into the shaft. In the process, by sliding contact with the outer peripheral surface of the shaft, characterized in was configured to deform opening in a direction twisted relative to the first leg.

請求項２の発明は、請求項１に記載のものにおいて、前記先端側脚部は、その先端側へ行くほど前記第１脚部の前記シャフトへの挿入方向とは逆方向に傾く形状をなしているところに特徴を有する。   According to a second aspect of the present invention, in the first aspect of the present invention, the distal leg portion has a shape that inclines in a direction opposite to the insertion direction of the first leg portion into the shaft toward the distal end side. It has the characteristics in the place.

請求項３の発明は、請求項１又は２に記載のものにおいて、前記基端側脚部は、Ｕ字状の前記折り返し部の折り返し端から直線状に延びる形状をなしているところに特徴を有する。   The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the base end side leg portion has a shape extending linearly from the folded end of the U-shaped folded portion. Have.

請求項４の発明は、請求項１ないし３のいずれか１項に記載のものにおいて、前記基端側脚部が前記シャフトの外周面の上方に配された場合に、前記先端側脚部の先端部は、前記シャフトの外周面のうち前記シャフトの中心よりも下方の部位を係止するところに特徴を有する。   According to a fourth aspect of the present invention, in the apparatus according to any one of the first to third aspects, when the proximal end leg portion is disposed above the outer peripheral surface of the shaft, The tip portion is characterized in that it locks a portion of the outer peripheral surface of the shaft below the center of the shaft.

請求項５の発明は、請求項１ないし４のいずれか１項に記載のものにおいて、前記第１脚部を挟んで前記先端側脚部の位置する側とは反対側には、前記シャフトに挿入された抜け止め対象物が配されるところに特徴を有する。   According to a fifth aspect of the present invention, there is provided the shaft according to any one of the first to fourth aspects, wherein the shaft is disposed on the opposite side of the first leg portion from the side where the distal leg portion is located. It is characterized in that the inserted retaining object is arranged.

請求項６の発明は、請求項１ないし５のいずれか１項に記載のものにおいて、前記折り返し部側には、前記仮想平面と直交する面側に屈曲された屈曲部が形成されているところに特徴を有する。   The invention according to claim 6 is the apparatus according to any one of claims 1 to 5, wherein a bent portion that is bent toward a surface orthogonal to the virtual plane is formed on the folded portion side. It has the characteristics.

請求項７の発明は、請求項６に記載のものにおいて、前記屈曲部は、前記先端側脚部が位置する側と同じ側に屈曲されているところに特徴を有する。   The invention of claim 7 is characterized in that, in the invention of claim 6, the bent portion is bent on the same side as the side on which the distal leg portion is located.

＜請求項１の発明＞
先端側脚部が基端側脚部と第１脚部とを含む仮想平面に対して斜めに配され、第１脚部のシャフトへの挿入過程では、先端側脚部がシャフトの外周面を摺接することで第１脚部に対してねじれる方向に開き変形するから、従来と違って、折り返し部をシャフトに近づけてその長さを短くしても、折り返し部に対する第２脚部の開き角度が大きくなることはなく、組付荷重の低減を実現することができる。したがって、本発明によれば、コンパクトで、かつ組付作業性に優れたスナップピンが提供される。 <Invention of Claim 1>
The distal leg is disposed obliquely with respect to a virtual plane including the proximal leg and the first leg, and in the process of inserting the first leg into the shaft, the distal leg extends over the outer peripheral surface of the shaft. Because it opens and deforms in the direction of twisting with respect to the first leg by sliding contact, unlike the conventional case, the opening angle of the second leg with respect to the folded portion is reduced even if the folded portion is brought closer to the shaft and the length thereof is shortened. Does not increase, and the assembly load can be reduced. Therefore, according to the present invention, a snap pin that is compact and has excellent assembly workability is provided.

＜請求項２の発明＞
先端側脚部がその先端へ行くほど第１脚部のシャフトへの挿入方向とは逆方向に傾く形状をなしているから、第１脚部のシャフトへの挿入過程で、先端側脚部がシャフトの外周面に円滑に摺接することとなり、折り返し部を支点とする基端側脚部の開き動作も円滑に誘導される。 <Invention of Claim 2>
Since the tip side leg portion is inclined in the direction opposite to the insertion direction of the first leg portion into the shaft as it goes to the tip end, the tip side leg portion is moved in the process of inserting the first leg portion into the shaft. The shaft is smoothly slidably contacted with the outer peripheral surface of the shaft, and the opening operation of the base end side leg portion with the folded portion as a fulcrum is also smoothly induced.

＜請求項３の発明＞
基端側脚部がＵ字状の折り返し部の折り返し端から直線状に延びる形状をなしているため、スナップピンの全長をより短くできる。 <Invention of Claim 3>
Since the base end side leg portion has a shape extending linearly from the folded end of the U-shaped folded portion, the entire length of the snap pin can be further shortened.

＜請求項４の発明＞
基端側脚部がシャフトの外周面の上方に配された場合に、先端側脚部の先端部がシャフトの外周面のうちシャフトの中心よりも下方の部位を係止するため、スナップピンに上下方向と直交する抜け方向の力が作用したときに、先端側脚部の先端部がシャフトの外周面に沿って第２脚部が閉じる方向に移動しようとして高い保持力をもって係止することとなり、抜け荷重が高められる。 <Invention of Claim 4>
When the proximal leg is placed above the outer peripheral surface of the shaft, the distal end of the distal leg locks the portion of the outer peripheral surface of the shaft below the center of the shaft. When a force in the pulling direction perpendicular to the vertical direction is applied, the tip of the tip side leg is locked with a high holding force so as to move in the direction in which the second leg closes along the outer peripheral surface of the shaft. , The unloading load is increased.

＜請求項５の発明＞
抜け止め対象物が第１脚部を挟んで先端側脚部の位置する側とは反対側に配されるから、抜け止め対象物と先端側脚部との干渉が回避される。その結果、スナップピンのシャフトへの組付作業を円滑に行うことができるとともに、抜け止め対象物とスナップピンとが互いの干渉に起因して変形したり損傷したりするのが防止される。 <Invention of Claim 5>
Since the retaining object is arranged on the opposite side of the first leg from the side where the distal leg is located, interference between the retaining object and the distal leg is avoided. As a result, the assembly work of the snap pin to the shaft can be performed smoothly, and the retaining object and the snap pin are prevented from being deformed or damaged due to mutual interference.

＜請求項６の発明＞
屈曲部を指で押圧することにより、スナップピンをシャフトに組み付けることができる。この場合に、屈曲部が仮想平面と直交する面側に屈曲されているから、指の当接部位が一点に集中することなく屈曲部の全体に亘って広く確保される。このため、指が痛くならずに済み、操作性が良好となる。 <Invention of Claim 6>
The snap pin can be assembled to the shaft by pressing the bent portion with a finger. In this case, since the bent portion is bent toward the surface orthogonal to the virtual plane, the contact portion of the finger is secured widely over the entire bent portion without concentrating on one point. For this reason, a finger does not hurt and operability is improved.

＜請求項７の発明＞
屈曲部が先端側脚部の位置する側と同じ側に屈曲されているから、スペース効率に優れる。また、請求項５の発明を含む場合には、抜け止め対象物と屈曲部との干渉も回避される。 <Invention of Claim 7>
Since the bent portion is bent to the same side as the side where the distal leg portion is located, the space efficiency is excellent. Further, when the invention of claim 5 is included, interference between the retaining object and the bent portion is also avoided.

＜実施形態１＞
本発明の実施形態１を図１ないし図３によって説明する。本実施形態に係るスナップピン１０は、１本の金属製の線材を折り曲げて形成され、互いに対向する第１、第２脚部２０、３０と、両脚部１０、２０の一端同士を互いに連結する折り返し部４０とによって構成されている。このスナップピン１０は、シャフト５０に弾性的に取り付けられ、かつシャフト５０への取り付け状態を保つことが可能とされている。シャフト５０にはカラー等の抜け止め対象物６０が挿通され、この抜け止め対象物６０はスナップピン１０によってシャフト５０からの抜け出しが防止されている。なお、スナップピン１０は長さ方向の全長に亘って同一径の円形断面を有しており、また、シャフト５０は、円柱棒状をなし、種々の機械部品として用いられる。 <Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The snap pin 10 according to the present embodiment is formed by bending a single metal wire, and connects the first and second leg portions 20 and 30 facing each other and one end of both the leg portions 10 and 20 to each other. The folding part 40 is comprised. The snap pin 10 is elastically attached to the shaft 50 and can be kept attached to the shaft 50. A retaining object 60 such as a collar is inserted into the shaft 50, and the retaining object 60 is prevented from coming off from the shaft 50 by the snap pins 10. The snap pin 10 has a circular cross section with the same diameter over the entire length in the length direction, and the shaft 50 has a cylindrical bar shape and is used as various machine parts.

第１脚部２０は、その全体が直線状に延びる形状とされ、シャフト５０の径方向に穿設された孔５１に径方向一側から他側へ向けて挿入される。第１脚部２０の直径は孔５１の直径よりも小さく、第１脚部２０は孔５１内に遊嵌状態で配される。一方、第１脚部２０の長さは孔５１の長さ（シャフト５０の直径）よりも大きく、第１脚部２０の一端側は、シャフト５０の径方向一側における孔５１の挿入口から外側に突出して配され、第１脚部２０の他端側（先端側）は孔５１を貫通してシャフト５０の径方向他側における孔５１の挿入出口から外側に突出して配される。なお、以下の説明において上下方向とは、第１脚部２０の孔５１への挿入方向（孔５１の形成方向）と直交する方向のことを言い、第２脚部３０が存する側を上方とする。   The entire first leg 20 has a shape extending linearly, and is inserted into a hole 51 formed in the radial direction of the shaft 50 from one radial direction to the other. The diameter of the first leg 20 is smaller than the diameter of the hole 51, and the first leg 20 is disposed in the hole 51 in a loosely fitted state. On the other hand, the length of the first leg portion 20 is larger than the length of the hole 51 (diameter of the shaft 50), and one end side of the first leg portion 20 extends from the insertion opening of the hole 51 on one side in the radial direction of the shaft 50. The other end side (front end side) of the first leg portion 20 extends through the hole 51 and projects outward from the insertion outlet of the hole 51 on the other radial side of the shaft 50. In the following description, the vertical direction means a direction orthogonal to the insertion direction of the first leg 20 into the hole 51 (the direction in which the hole 51 is formed), and the side on which the second leg 30 exists is defined as the upper side. To do.

折り返し部４０は、シャフト５０への組付時にシャフト５０の外周面の外側（径方向一側）に配され、第１脚部２０の一端からシャフト５０の外周面の上部側へ折り返されてその折り返し端が第２脚部３０の一端に連なる形状とされ、全体としてＵ字状、詳しくは中心角が１８０度に満たない略半円弧状をなしている。折り返し部４０の両端と第１、第２脚部２０、３０の各一端とは段差なく連なっており、第１、第２脚部２０、３０は折り返し部４０の両端からほぼ接線方向に延びている。   The folded portion 40 is disposed outside the outer peripheral surface of the shaft 50 (one side in the radial direction) when assembled to the shaft 50, and is folded from one end of the first leg portion 20 to the upper side of the outer peripheral surface of the shaft 50. The folded end is formed in a shape that is continuous with one end of the second leg portion 30, and has a U-shape as a whole, specifically a substantially semicircular arc shape with a central angle of less than 180 degrees. Both ends of the folded portion 40 and each one end of the first and second leg portions 20 and 30 are connected without any step, and the first and second leg portions 20 and 30 extend substantially tangentially from both ends of the folded portion 40. Yes.

第２脚部３０は、シャフト５０への組付時にシャフト５０の外周面の外側（上方）に配され、その一端から径方向他側へ向けて第１脚部２０との距離を次第に拡げるように斜め上方向へ直線状に延びる基端側脚部３１と、基端側脚部３１の延出端から下向きに屈曲されて直線状に延びる先端側脚部３２とからなる。基端側脚部３１と先端側脚部３２とを合わせた展開長は、第１脚部２０よりも長くなっている。   The second leg 30 is arranged outside (upward) the outer peripheral surface of the shaft 50 when assembled to the shaft 50, and gradually increases the distance from the first leg 20 from one end to the other radial direction. The base end side leg portion 31 that extends linearly in a diagonally upward direction and the front end side leg portion 32 that is bent downward from the extending end of the base end side leg portion 31 and extends linearly. The developed length of the base end side leg portion 31 and the front end side leg portion 32 is longer than that of the first leg portion 20.

基端側脚部３１は、シャフト５０の上端上方を横切って配され、シャフト５０の上端と折り返し部４０との間にてシャフト５０の外周面の上部に点接触状態で弾性的に当接される。基端側脚部３１と第１脚部２０とはそれぞれシャフト５０の中心軸と直交する上下方向の仮想平面Ｐ（図２を参照）上に配され、基端側脚部３１の他端（延出端）は第１脚部２０の先端側における突出部位の鉛直上方に位置している。   The proximal end leg portion 31 is arranged across the upper end of the shaft 50 and is elastically brought into contact with the upper portion of the outer peripheral surface of the shaft 50 between the upper end of the shaft 50 and the folded portion 40 in a point contact state. The The base end side leg portion 31 and the first leg portion 20 are respectively arranged on a virtual plane P (see FIG. 2) in the vertical direction orthogonal to the central axis of the shaft 50, and the other end of the base end side leg portion 31 (see FIG. 2). The extended end) is positioned vertically above the protruding portion on the distal end side of the first leg portion 20.

先端側脚部３２は、シャフト５０の軸方向（図２の左右方向）と直交する側方から見た場合に、上記の仮想平面Ｐと交差するよう斜めに配され、具体的には、先端側脚部３２は、第１脚部２０の先端側との干渉を回避するように上記の仮想平面Ｐに対して斜めに配され、第１脚部２０とはねじれの位置関係をなす。また、先端側脚部３２は、図３に示すように、基端側脚部３１の延出端にアール状に連なり、かつ下端側（先端側）へ行くに従って次第に径方向一側（第１脚部２０の孔５１への挿入方向とは逆側）に傾くように配されている。先端側脚部３２の下端側は、図１に示すように、上下方向に関してシャフト５０の中央よりも下方に位置し、第１脚部２０に抜け方向の力が作用したときには、シャフト５０の外周面の下部に点接触状態で弾性的に当接される。   When viewed from the side perpendicular to the axial direction of the shaft 50 (the left-right direction in FIG. 2), the distal end side leg portion 32 is disposed obliquely so as to intersect the virtual plane P described above. The side legs 32 are arranged obliquely with respect to the imaginary plane P so as to avoid interference with the distal end side of the first legs 20, and have a twisted positional relationship with the first legs 20. Further, as shown in FIG. 3, the distal leg portion 32 is rounded to the extending end of the proximal leg portion 31 and gradually goes to one side in the radial direction (first side as it goes to the lower end side (tip side)). The leg portion 20 is disposed so as to be inclined in the direction opposite to the insertion direction into the hole 51. As shown in FIG. 1, the lower end side of the distal end side leg portion 32 is positioned below the center of the shaft 50 in the vertical direction, and when a force in the removal direction acts on the first leg portion 20, It is elastically brought into contact with the lower part of the surface in a point contact state.

次に、本実施形態に係るスナップピン１０のシャフト５０への組付動作について説明する。
シャフト５０の孔５１内に径方向一側から他側へ向けて第１脚部２０を挿入する。このとき、図２に示すように、シャフト５０に挿通された抜け止め対象物６０が第１脚部２０を挟んで先端側脚部３２の位置する側（先端側脚部３２のねじれ方向）とは反対側に配されるようにして、抜け止め対象物６０と先端側脚部３２とが互いに干渉しないようにする。特に、抜け止め対象物６０が図示するようなカラーの場合には、カラーの円筒部６１が先端側脚部３２の先端とシャフト５０の外周面との間に噛む込み、第２脚部３０の拡開動作を誘発するおそれがあるため、このように先端側脚部３２と抜け止め対象物６０とを非干渉に配することが望まれる。 Next, the assembly | attachment operation | movement to the shaft 50 of the snap pin 10 concerning this embodiment is demonstrated.
The first leg 20 is inserted into the hole 51 of the shaft 50 from one side in the radial direction toward the other side. At this time, as shown in FIG. 2, the retaining object 60 inserted through the shaft 50 is located on the side where the distal leg portion 32 is located across the first leg portion 20 (twist direction of the distal leg portion 32). Are arranged on the opposite side so that the retaining object 60 and the distal leg 32 do not interfere with each other. In particular, when the retaining object 60 is a collar as shown in the figure, the cylindrical portion 61 of the collar bites between the distal end of the distal leg portion 32 and the outer peripheral surface of the shaft 50, and Since there is a possibility of inducing a widening operation, it is desirable to dispose the distal leg portion 32 and the retaining object 60 in this way without interference.

第１脚部２０の先端が孔５１内に挿入された後、先端側脚部３２の側縁がシャフト５０の外周面の上部に当接される。この状態で、折り返し部４０を径方向他側へさらに押し込むと、先端側脚部３２がシャフト５０の外周面を上方へ摺動し、基端側脚部３１の延出端を支点として第１脚部２０に対してねじれる方向へ弾性的に開き変形し、かつ基端側脚部３１が先端側脚部３２とは反対側に傾倒しながら折り返し部４０を支点として上方へ弾性的に開き変形して、第２脚部３０全体として３次元的に変形して行く。その後、先端側脚部３２がシャフト５０の上端を通過すると、先端側脚部３２は、第２脚部３０の弾性復元力によって付勢されつつシャフト５０の外周面を一気に滑落して元の状態に復帰する。この間、第１脚部２０は孔５１の内壁上面を摺動することにより、第２脚部３０側の変形力を受ける軸となって、スナップピン１０の組み付け動作を案内する。   After the distal end of the first leg 20 is inserted into the hole 51, the side edge of the distal leg 32 is brought into contact with the upper portion of the outer peripheral surface of the shaft 50. In this state, when the folded portion 40 is further pushed to the other side in the radial direction, the distal end side leg portion 32 slides upward on the outer peripheral surface of the shaft 50, and the extended end of the proximal end side leg portion 31 serves as a fulcrum. Elastically opens and deforms in a twisting direction with respect to the leg 20, and elastically opens and deforms upward with the folded portion 40 as a fulcrum while the proximal leg 31 is tilted to the opposite side of the distal leg 32. Then, the entire second leg 30 is deformed three-dimensionally. Thereafter, when the distal leg portion 32 passes the upper end of the shaft 50, the distal leg portion 32 slides down on the outer peripheral surface of the shaft 50 at a stretch while being urged by the elastic restoring force of the second leg portion 30. Return to. During this time, the first leg 20 slides on the upper surface of the inner wall of the hole 51, thereby serving as a shaft that receives the deformation force on the second leg 30 side and guides the assembly operation of the snap pin 10.

こうしてスナップピン１０がシャフト５０に正規に取り付けられた状態では、基端側脚部３１の側縁がシャフト５０の外周面の上部に当接されるとともに、先端側脚部３２の先端側がシャフト５０の外周面の下部に当接又は近接され、これによってスナップピン１０がシャフト５０に抜け止め状態で強固に保持される。また、抜け止め対象物６０がスナップピン１０の側縁に当接されることにより、抜け止め対象物６０のスナップピン１０からの離脱が阻止される。   Thus, in a state where the snap pin 10 is properly attached to the shaft 50, the side edge of the base end side leg portion 31 is brought into contact with the upper part of the outer peripheral surface of the shaft 50, and the tip end side of the tip end side leg portion 32 is the shaft 50. The snap pin 10 is firmly held by the shaft 50 in a state of being prevented from coming off. Further, when the retaining object 60 is brought into contact with the side edge of the snap pin 10, the retaining object 60 is prevented from being detached from the snap pin 10.

以上説明したように、本実施形態によれば、先端側脚部３２が基端側脚部３１と第１脚部２０とを含む仮想平面Ｐに対して斜めに配され、第１脚部２０の孔５１への挿入過程では、先端側脚部３２がシャフト５０の外周面を摺接することで第１脚部２０に対してねじれる方向に開き変形するから、従来と違って、折り返し部４０をシャフト５０に近づけても、折り返し部４０に対する第２脚部３０の開き角度が大きくなることはなく、組付荷重の低減を実現できる。したがって、折り返し部４０の長さを短くでき、ひいてはスナップピン１０の全長を短くできるため、コンパクトにすることができる。   As described above, according to the present embodiment, the distal leg portion 32 is arranged obliquely with respect to the virtual plane P including the proximal leg portion 31 and the first leg portion 20, and the first leg portion 20. In the insertion process into the hole 51, the distal end side leg portion 32 opens and deforms in a twisting direction with respect to the first leg portion 20 by slidingly contacting the outer peripheral surface of the shaft 50. Even if it is close to the shaft 50, the opening angle of the second leg portion 30 with respect to the folded portion 40 does not increase, and a reduction in the assembly load can be realized. Therefore, since the length of the folding | returning part 40 can be shortened and by extension the total length of the snap pin 10 can be shortened, it can be made compact.

また、先端側脚部３２がその先端へ行くほど第１脚部２０の孔５１への挿入方向と逆方向に傾く形状をなしているため、シャフト５０への組付過程で、先端側脚部３２がシャフト５０の外周面を円滑に摺接して、折り返し部４０を支点とする基端側脚部３１の開き動作の円滑性が担保される。   Further, since the distal leg portion 32 is inclined in the direction opposite to the insertion direction of the first leg portion 20 into the hole 51 as it goes to the distal end, the distal leg portion is attached to the shaft 50 during the assembly process. 32 smoothly slidably contacts the outer peripheral surface of the shaft 50, and the smoothness of the opening operation of the base end side leg portion 31 with the folded portion 40 as a fulcrum is ensured.

また、従来のスナップピン１００では、図１の二点鎖線で示すように、中心角が１８０度を超える円弧状の折り返し部４００の折り返し端に基端側脚部３１０が弧状に連なり、かつその基端側脚部３１０がシャフト５０の外周面の上部に沿うように湾曲状をなすものであった。しかるにかかる構成であると、スナップピン１００の全長が長くなって材料費が嵩むとともに、シャフト５０の外周面から出っ張った折り返し部４００に異物が干渉し易いという事情があった。その点、本実施形態においては、基端側脚部３１がＵ字状の折り返し部４０の折り返し端から直線状に延びて径方向他側に至る形状とされているから、スナップピン１０の全長を十分に短くでき、かつ折り返し部４０のシャフト５０からの出っ張り量Ａが減少して異物との干渉を回避し易い。   Further, in the conventional snap pin 100, as shown by a two-dot chain line in FIG. 1, the base end side leg portion 310 is connected in an arc shape to the folded end of the arcuate folded portion 400 whose central angle exceeds 180 degrees, and The base end side leg portion 310 was curved so as to be along the upper portion of the outer peripheral surface of the shaft 50. However, with this configuration, the snap pin 100 becomes longer and the material cost increases, and foreign matter easily interferes with the folded portion 400 protruding from the outer peripheral surface of the shaft 50. In this respect, in the present embodiment, the base end side leg portion 31 has a shape extending linearly from the folded end of the U-shaped folded portion 40 to reach the other side in the radial direction. Can be sufficiently shortened, and the amount of protrusion A from the shaft 50 of the folded-back portion 40 can be reduced to easily avoid interference with foreign matter.

また、基端側脚部３１がシャフト５０の外周面の上方に配され、先端側脚部３２の先端部がシャフト５０の外周面のうちシャフト５０の中心よりも下方の部位を係止するため、スナップピン１０に対して径方向一側への引き抜き力が作用しても、先端側脚部３２の先端部がシャフト５０の外周面に沿って第２脚部３０が閉じる方向に移動しようとして、高い保持力をもって係止することとなり、抜け荷重が高められる。しかも、この構成であれば、十分な抜け荷重を得ることができるため、スナップピン１０の線径を細くすることも可能となり、これによって材料費の節約、及び組付荷重の低減にいっそう貢献できる。   Further, the base end side leg portion 31 is disposed above the outer peripheral surface of the shaft 50, and the front end portion of the front end side leg portion 32 locks a portion of the outer peripheral surface of the shaft 50 below the center of the shaft 50. Even if a pulling force to one side in the radial direction acts on the snap pin 10, the distal end portion of the distal leg portion 32 tends to move along the outer peripheral surface of the shaft 50 in the closing direction of the second leg portion 30. Therefore, the retaining load is increased with a high holding force, and the removal load is increased. Moreover, with this configuration, a sufficient pull-out load can be obtained, so that the wire diameter of the snap pin 10 can be reduced, thereby further contributing to savings in material costs and a reduction in assembly load. .

さらに、抜け止め対象物６０が第１脚部２０を挟んで第２脚部３０の先端側の位置する側とは反対側に配されるから、スナップピン１０のシャフト５０への組付作業を円滑に行うことができるとともに、抜け止め対象物６０とスナップピン１０とが互いの干渉に起因して変形したり損傷したりするのが防止される。   Furthermore, since the retaining object 60 is disposed on the opposite side of the first leg portion 20 from the side where the distal end side of the second leg portion 30 is located, the assembly work of the snap pin 10 to the shaft 50 is performed. It can be performed smoothly, and the retaining object 60 and the snap pin 10 are prevented from being deformed or damaged due to mutual interference.

＜実施形態２＞
次に、本発明の実施形態２を図４及び図５によって説明する。実施形態２では、スナップピン１０の折り返し部４０側に屈曲部４７が形成されている点で実施形態１とは異なる。その他は実施形態１と同様であるため、実施形態１と同様の構造部位には同一符号を付し、重複する説明は省略する。 <Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in that a bent portion 47 is formed on the folded portion 40 side of the snap pin 10. Since the others are the same as those in the first embodiment, the same structural parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

スナップピン１０の折り返し部４０側には、仮想平面Ｐと直交する面Ｐ２側に向けて屈曲された屈曲部４７が形成されている。この屈曲部４７は、折り返し部４０を、第１脚部２０との連結部位４８及び第２脚部３０との連結部位４９を支点として、先端側脚部３２の位置する側と同じ側へ略直角に屈曲することにより、面Ｐ２にほぼ沿って配されてなる。面Ｐ２は、シャフト５０の軸方向と平行な面であって、スナップピン１０のシャフト５０への組付方向と対向する面である。   A bent portion 47 that is bent toward the surface P2 side orthogonal to the virtual plane P is formed on the folded portion 40 side of the snap pin 10. The bent portion 47 is configured so that the folded-back portion 40 is substantially directed to the same side as the side where the distal leg portion 32 is located, with the connecting portion 48 connected to the first leg portion 20 and the connecting portion 49 connected to the second leg portion 30 as fulcrums. By being bent at a right angle, it is arranged substantially along the surface P2. The surface P2 is a surface parallel to the axial direction of the shaft 50 and is opposed to the assembly direction of the snap pin 10 to the shaft 50.

シャフト５０への組み付けに際し、シャフト５０の孔５１に第１脚部２０の先端部を径方向一側から挿入し、その状態で屈曲部４７の側縁に作業者の指を当て、この指で屈曲部４７を他側へ向けて押圧する。すると、実施形態１と同様に、第１脚部２０を軸とする第２脚部３０の３次元的な開き動作を伴ったあと先端側脚部３２がシャフト５０の外周面の下部に弾性的に当接又は近接し、もってスナップピン１０がシャフト５０に抜け止め状態に取り付けられる。この場合に、指の当接部位が屈曲部４７の形成範囲に亘って広く確保されて、実質的に面接触状態となるから、指への負担が軽減される。その結果、組付時の操作性が良好となる。また、屈曲部４７の屈曲方向と先端側脚部３２の傾き方向とが同じ側を向いているから、スペース効率に優れるとともに、シャフト５０に挿通された抜け止め対象物６０を屈曲部４７及び先端側脚部３２の位置する側と反対側に配することにより、抜け止め対象物６０と屈曲部４７との干渉も回避される。 When assembling to the shaft 50, the distal end portion of the first leg portion 20 is inserted into the hole 51 of the shaft 50 from one side in the radial direction, and in this state, the operator's finger is applied to the side edge of the bent portion 47, and this finger is used. The bending part 47 is pressed toward the other side. Then, as in the first embodiment, after the three-dimensional opening operation of the second leg portion 30 with the first leg portion 20 as an axis, the distal leg portion 32 is elastically applied to the lower portion of the outer peripheral surface of the shaft 50. Thus, the snap pin 10 is attached to the shaft 50 so as not to come off. In this case, the contact portion of the finger is ensured widely over the range where the bent portion 47 is formed, and the surface is brought into a substantially surface contact state, so the burden on the finger is reduced. As a result, the operability during assembly is good. Further, since the bending direction of the bending portion 47 and the inclination direction of the distal leg portion 32 are directed to the same side, the space efficiency is excellent, and the retaining object 60 inserted through the shaft 50 is attached to the bending portion 47 and the distal end. By arranging on the side opposite to the side where the side leg portion 32 is located, interference between the retaining object 60 and the bent portion 47 is also avoided.

＜参考例＞
次に、参考例を図６ないし図９に示す。参考例に係るスナップピン１０Ａは、第２脚部３０Ａの形態が実施形態１とは異なっている。その他は実施形態１と同様であり、実施形態１と同様の構造部位には同一符号を付す。 <Reference example>
Next, reference examples are shown in FIGS. The snap pin 10A according to the reference example is different from the first embodiment in the form of the second leg portion 30A. Others are the same as those of the first embodiment, and the same reference numerals are given to the same structural portions as those of the first embodiment.

第２脚部３０Ａの基端側脚部３１Ａは、図８に示すように、その一端（折り返し部４０の折り返し端）から径方向他側へ延びる途中に配される移行部３４と、移行部３４よりも一端側に配される第１片部３５と、移行部３４よりも他端側に配される第２片部３６とからなり、第１片部３５と第２片部３６とが移行部３４を介してシャフト５０の軸方向に位置ずれしている。   As shown in FIG. 8, the base end side leg portion 31A of the second leg portion 30A has a transition portion 34 disposed on the way from one end thereof (the folded end of the folded portion 40) to the other side in the radial direction, and a transition portion. The first piece portion 35 is disposed on one end side than the 34, and the second piece portion 36 is disposed on the other end side than the transition portion 34, and the first piece portion 35 and the second piece portion 36 are provided. The position is displaced in the axial direction of the shaft 50 via the transition portion 34.

具体的には、第１片部３５は、第１脚部２０を含む上下方向の仮想平面Ｐ上に配され、図４に示すように、移行部３４寄りの位置にてシャフト５０の外周面の上部に弾性的に当接される。移行部３４は、図８に示すように、第１片部３５と第２片部３６との間にて上記の仮想平面Ｐと交差する斜め方向に延びてなる。また、第２片部３６は、上記の仮想平面Ｐから一定距離（第１片部３５と第２片部３６との間の位置ずれ量に相当）をおいて平行に配されている。   Specifically, the first piece portion 35 is disposed on the vertical virtual plane P including the first leg portion 20, and as shown in FIG. 4, the outer peripheral surface of the shaft 50 at a position near the transition portion 34. It is elastically contacted with the upper part. As shown in FIG. 8, the transition portion 34 extends between the first piece portion 35 and the second piece portion 36 in an oblique direction intersecting the virtual plane P. The second piece 36 is arranged in parallel with a certain distance from the virtual plane P (corresponding to the amount of displacement between the first piece 35 and the second piece 36).

第２脚部３０Ａの先端側脚部３２Ａは、第２片部３６の延出端にアール状に連なりかつそこから下端へ行くに従って次第に径方向一側へ寄るように配され、シャフト５０の軸方向（図８の左右方向）から見た場合に第１脚部２０の先端側と交差するよう斜めに配されている。また、第２脚部３０Ａの先端側脚部３２Ａは、シャフト５０の軸方向に関して第２片部３６と同位置となるようにシャフト５０の軸方向と直交する方向から見て垂直に配されている。つまり、先端側脚部３２Ａと第２片部３６とは、図７及び図８に示すように、それぞれ上記の仮想平面Ｐと平行な別の仮想平面Ｐ１上に配されている。実施形態１と同様に、先端側脚部３２Ａと第１脚部２０とは互いにねじれの位置関係をなして互いの干渉が回避され、さらに、先端側脚部３２Ａの下端部（先端部）は、第１脚部２０に抜け方向の力が作用したときに、シャフト５０の外周面の下部を点接触状態で弾性的に係止するようになっている。   The distal leg portion 32A of the second leg portion 30A is connected to the extending end of the second piece portion 36 in a rounded shape, and is arranged so as to gradually approach one side in the radial direction from there to the lower end. When viewed from the direction (left-right direction in FIG. 8), it is arranged obliquely so as to intersect the distal end side of the first leg portion 20. Further, the distal leg portion 32A of the second leg portion 30A is arranged vertically when viewed from the direction orthogonal to the axial direction of the shaft 50 so as to be in the same position as the second piece portion 36 with respect to the axial direction of the shaft 50. Yes. That is, the tip side leg portion 32A and the second piece portion 36 are arranged on different virtual planes P1 parallel to the virtual plane P, as shown in FIGS. As in the first embodiment, the distal leg portion 32A and the first leg portion 20 are twisted with each other to avoid mutual interference, and the lower end portion (tip portion) of the distal leg portion 32A is When a force in the pulling direction acts on the first leg portion 20, the lower portion of the outer peripheral surface of the shaft 50 is elastically locked in a point contact state.

ここで、図９に示すように、スナップピン１０Ａのシャフト５０への組みつけに際し、スナップピン１０Ａをその正規の組み付け姿勢に対して第１脚部２０の軸周りに９０度回転させ、その状態で第１脚部２０を孔５１内に挿入すると、第２片部３６がシャフト５０の外周面のうちの上端側へ寄った位置に当接され、そこからシャフト５０の外周面への摺動を開始するため、第２片部３６の拡開量が小さく抑えられる。このため、組み付け荷重を小さくでき、良好な作業性を実現できる。   Here, as shown in FIG. 9, when the snap pin 10A is assembled to the shaft 50, the snap pin 10A is rotated 90 degrees around the axis of the first leg portion 20 with respect to the regular assembly posture, When the first leg portion 20 is inserted into the hole 51, the second piece portion 36 is brought into contact with a position of the outer peripheral surface of the shaft 50 that is close to the upper end side, and slides from there to the outer peripheral surface of the shaft 50. Therefore, the amount of expansion of the second piece 36 is kept small. For this reason, an assembly | attachment load can be made small and favorable workability | operativity is realizable.

また、実施形態１と同様に、先端側脚部３２Ａの先端部がシャフト５０の外周面の下部を弾性的に係止するから、シャフト５０からの抜け荷重が高められる。   Further, similarly to the first embodiment, the distal end portion of the distal end side leg portion 32A elastically locks the lower portion of the outer peripheral surface of the shaft 50, so that the load from the shaft 50 is increased.

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
（１）第１脚部の先端側がシャフトの外周面から突出することなく孔内に配されていてもよい。
（２）基端側脚部と先端側脚部の少なくともいずれかは曲状に形成されていてもよい。
（３）実施形態２の屈曲部は、スナップピンのうち折り返し部以外の部分をも含めて屈曲形成される構成であってもよい。
（４）実施形態２の屈曲部は、仮想平面と直交する面側に屈曲されていればよく、仮想平面と直交する面に対して多少傾いて形成されていてもよい。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The tip end side of the first leg may be arranged in the hole without protruding from the outer peripheral surface of the shaft.
(2) At least one of the proximal end leg portion and the distal end side leg portion may be formed in a curved shape.
(3) The bent portion of the second embodiment may be configured to be bent including a portion other than the folded portion of the snap pin.
(4) The bending part of Embodiment 2 should just be bent in the surface side orthogonal to a virtual plane, and may be inclined a little with respect to the surface orthogonal to a virtual plane.

本発明の実施形態１に係り、シャフトにスナップピンを取り付けた状態を示す正面図である。It is a front view which concerns on Embodiment 1 of this invention and shows the state which attached the snap pin to the shaft. スナップピンが抜け止め対象物を抜け止めする状態を示す側面図である。It is a side view which shows the state in which a snap pin keeps a fallen target object. スナップピンの正面図である。It is a front view of a snap pin. 本発明の実施形態２に係り、シャフトにスナップピンを取り付けた状態を示す正面図である。It is a front view which concerns on Embodiment 2 of this invention and shows the state which attached the snap pin to the shaft. シャフトにスナップピンを取り付けた状態を示す側面図である。It is a side view which shows the state which attached the snap pin to the shaft. 参考例に係り、シャフトにスナップピンを取り付けた状態を示す正面図である。It is a front view which shows the state which concerns on the reference example and attached the snap pin to the shaft. シャフトにスナップピンを取り付けた状態を示す側面図である。It is a side view which shows the state which attached the snap pin to the shaft. シャフトにスナップピンを取り付けた状態を示す平面図である。It is a top view which shows the state which attached the snap pin to the shaft. シャフトにスナップピンを取り付ける途中の状態を示す正面図である。It is a front view which shows the state in the middle of attaching a snap pin to a shaft.

１０…スナップピン
２０…第１脚部
３０…第２脚部
３１…基端側脚部
３２…先端側脚部
４０…折り返し部
４７…屈曲部
５０…シャフト
５１…孔
６０…抜け止め対象物
Ｐ…仮想平面 DESCRIPTION OF SYMBOLS 10 ... Snap pin 20 ... 1st leg part 30 ... 2nd leg part 31 ... Base end side leg part 32 ... Front end side leg part 40 ... Folding part 47 ... Bending part 50 ... Shaft 51 ... Hole 60 ... Retaining object
P ... Virtual plane

Claims (7)

第１、第２脚部と、これらの一端同士を連結する折り返し部とを備え、
前記第１脚部は、シャフトに形成された孔に挿入され、
前記第２脚部は、前記シャフトの外周面の外側に配され、かつ、前記折り返し部から前記第１脚部と対向して延びる基端側脚部と、前記基端側脚部の延出端から前記第１脚部側に屈曲される先端側脚部とを有し、
前記第１脚部が前記シャフトに正規挿入された状態で、前記先端側脚部が前記シャフトの外周面を弾性的に係止することにより、前記第１脚部の前記シャフトからの抜け出しが規制されるスナップピンであって、
前記先端側脚部は、前記基端側脚部と前記第１脚部とを含む仮想平面に対して斜めに配され、前記第１脚部の前記シャフトへの挿入過程では、前記シャフトの外周面を摺接することにより、前記第１脚部に対してねじれる方向に開き変形することを特徴とするスナップピン。 A first leg portion, a second leg portion, and a folded portion connecting these one ends;
The first leg is inserted into a hole formed in the shaft;
The second leg portion is disposed outside the outer peripheral surface of the shaft and extends from the folded portion so as to face the first leg portion, and the base leg portion extends. A tip side leg that is bent from the end toward the first leg,
In a state where the first leg portion is normally inserted into the shaft, the distal end side leg portion elastically locks the outer peripheral surface of the shaft, thereby preventing the first leg portion from coming out of the shaft. A snap pin,
The distal leg is disposed obliquely with respect to a virtual plane including the proximal leg and the first leg, and an outer periphery of the shaft is inserted into the shaft of the first leg. A snap pin characterized by opening and deforming in a twisting direction with respect to the first leg by slidingly contacting a surface. 前記先端側脚部は、その先端側へ行くほど前記第１脚部の前記シャフトへの挿入方向とは逆方向に傾く形状をなしていることを特徴とする請求項１記載のスナップピン。   2. The snap pin according to claim 1, wherein the distal leg portion has a shape that inclines in a direction opposite to a direction in which the first leg portion is inserted into the shaft toward the distal end side thereof. 前記基端側脚部は、Ｕ字状の前記折り返し部の折り返し端から直線状に延びる形状をなしていることを特徴とする請求項１又は２記載のスナップピン。   The snap pin according to claim 1, wherein the base end side leg portion has a shape extending linearly from a folded end of the U-shaped folded portion. 前記基端側脚部が前記シャフトの外周面の上方に配された場合に、前記先端側脚部の先端部は、前記シャフトの外周面のうち前記シャフトの中心よりも下方の部位を係止することを特徴とする請求項１ないし３のいずれか１項記載のスナップピン。   When the base end side leg portion is disposed above the outer peripheral surface of the shaft, the front end portion of the front end side leg portion locks a portion of the outer peripheral surface of the shaft below the center of the shaft. The snap pin according to any one of claims 1 to 3, wherein the snap pin is provided. 前記第１脚部を挟んで前記先端側脚部の位置する側とは反対側には、前記シャフトに挿入された抜け止め対象物が配されることを特徴とする請求項１ないし４のいずれか１項記載のスナップピン。   5. The retaining object inserted into the shaft is disposed on the opposite side of the first leg from the side where the distal leg is located. 6. The snap pin according to claim 1. 前記折り返し部側には、前記仮想平面と直交する面側に屈曲された屈曲部が形成されていることを特徴とする請求項１ないし５のいずれか１項記載のスナップピン。   The snap pin according to any one of claims 1 to 5, wherein a bent portion that is bent toward a surface orthogonal to the virtual plane is formed on the folded portion side. 前記屈曲部は、前記先端側脚部が位置する側と同じ側に屈曲されていることを特徴とする請求項６記載のスナップピン。 The snap pin according to claim 6, wherein the bent portion is bent to the same side as the side on which the distal leg portion is located.
JP2009003454A 2009-01-09 2009-01-09 Snap pin Expired - Fee Related JP5234635B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55157118U (en) * 1979-04-25 1980-11-12
JPS6230012U (en) * 1985-08-08 1987-02-23
JP2001200820A (en) * 1999-11-11 2001-07-27 Tokai Spring Seisakusho:Kk Coming-out prevention pin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55157118U (en) * 1979-04-25 1980-11-12
JPS6230012U (en) * 1985-08-08 1987-02-23
JP2001200820A (en) * 1999-11-11 2001-07-27 Tokai Spring Seisakusho:Kk Coming-out prevention pin

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