JP6735699B2 - Couplings and connectors - Google Patents

Couplings and connectors Download PDF

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JP6735699B2
JP6735699B2 JP2017053244A JP2017053244A JP6735699B2 JP 6735699 B2 JP6735699 B2 JP 6735699B2 JP 2017053244 A JP2017053244 A JP 2017053244A JP 2017053244 A JP2017053244 A JP 2017053244A JP 6735699 B2 JP6735699 B2 JP 6735699B2
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coupling
arm portion
curved beam
shaped
groove
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JP2018155343A (en
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正樹 有賀
正樹 有賀
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Kito Corp
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Kito Corp
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Priority to PCT/JP2017/047187 priority patent/WO2018168162A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/04—Quickly-detachable chain couplings; Shackles chain links with rapid junction means are classified according to the corresponding kind of chain

Description

本発明は、チェーンに連結される結合金具および連結具に関する。 TECHNICAL FIELD The present invention relates to a connecting fitting and a connecting tool that are connected to a chain.

たとえば、荷を掛けるフックをチェーンに連結させる際には、結合金具を介してフックをチェーンに連結させることが多い。このような結合金具としては、たとえば特許文献１〜４に示すものがある。 For example, when connecting a hook for loading to a chain, the hook is often connected to the chain via a coupling fitting. Examples of such a fitting include those shown in Patent Documents 1 to 4.

特許文献１〜３には、挿込腕部と溝形腕部の間に曲がり梁部が存在している構成が開示されている。この曲がり梁部は、チェーン等の連結対象物が連結される部分である。ここで、自然荷重下で、結合金具およびチェーンが垂れ下がっているときの、結合金具に対するチェーンの回動方向の位置を垂下位置とすると、曲がり梁部に連結されたチェーンは、曲がり梁部に沿って垂下位置から離れるようにスライド自在となっている。 Patent Documents 1 to 3 disclose configurations in which a curved beam portion is present between the insertion arm portion and the groove-shaped arm portion. The curved beam portion is a portion to which an object to be connected such as a chain is connected. Here, when the position of the chain with respect to the coupling fitting in the direction of rotation of the chain when the coupling fitting and the chain hang down under a natural load is the hanging position, the chain connected to the curved beam section will follow the curved beam section. It is slidable away from the hanging position.

一方、曲がり梁部の断面形状は、円形に近いものの、溝形腕部に向かうにつれて徐々に偏平となるような楕円形状に設けられている。したがって、チェーンの垂下位置からの回動量が大きくなり、チェーンが溝形腕部付近の曲がり梁部に差し掛かると、回動方向およびスライド方向に移動不能となる。なお、このようなチェーンが移動不能な状態を、チェーンのもつれという。 On the other hand, the cross-sectional shape of the curved beam portion is close to a circle, but is provided in an elliptical shape that gradually becomes flatter toward the groove-shaped arm portion. Therefore, when the amount of rotation of the chain from the hanging position becomes large and the chain approaches the curved beam near the groove-shaped arm, it cannot move in the rotation direction and the sliding direction. The state in which the chain cannot move is called entanglement of the chain.

また、特許文献４には、曲がり梁部の断面が偏平状（図９参照）となっている結合金具が開示されている。この構成では、チェーンが垂下位置にあるとき、チェーンは曲がり梁部に沿ってスライド自在であるが、曲がり梁部に対しては、チェーンは垂下位置から回動不能となっている。 Further, Patent Document 4 discloses a coupling fitting in which a curved beam portion has a flat cross section (see FIG. 9). In this configuration, when the chain is in the hanging position, the chain is slidable along the curved beam portion, but the chain cannot be rotated from the hanging position with respect to the curved beam portion.

特許第５７３２３７９号公報Patent No. 5732379 特開２０００−４６１２３号公報JP-A-2000-46123 特公昭６３−３５８６１号公報Japanese Patent Publication No. 63-35861 ＵＳ２０１４／０２９０２０６号公報US2014/0290206 publication

ところで、特許文献４の構成では、曲がり梁部に対してチェーンが回動不能となるので、チェーンのもつれを防止可能となる。しかしながら、チェーンを回動させる方向の力が作用する場合、曲がり梁部に大きな曲げモーメントが付与されるので、好ましくない。すなわち、チェーンは、曲がり梁部に対して垂下位置から自由に回動できることが好ましい。 By the way, in the structure of Patent Document 4, since the chain cannot rotate with respect to the curved beam portion, it is possible to prevent the chain from becoming entangled. However, when a force in the direction of rotating the chain acts, a large bending moment is applied to the bending beam portion, which is not preferable. That is, it is preferable that the chain can freely rotate from the hanging position with respect to the curved beam portion.

一方、特許文献１〜３に開示の構成では、チェーンが挿込腕部の近傍に位置しているときには、チェーンは垂下位置から自在に回動可能となっている。しかしながら、チェーンが溝形腕部の近傍に位置した状態でチェーンが回動すると、チェーンのもつれが生じてしまう。 On the other hand, in the configurations disclosed in Patent Documents 1 to 3, when the chain is located in the vicinity of the inserting arm portion, the chain can freely rotate from the hanging position. However, if the chain is rotated with the chain positioned near the groove-shaped arm portion, the chain will be entangled.

近年は、チェーンの強度が向上しており、それに伴ってチェーンの金属部分の直径は小径化している。その場合、チェーンの金属輪で囲まれたリング孔も小径化するので、曲がり梁部も小径化させる必要がある。ここで、特許文献１〜３に開示の構成では、曲がり梁部が小径化しても、その強度を十分に確保する必要がある。そのため、特許文献１〜３に開示の構成では、溝形腕部に向かうにつれて曲がり梁部の断面が楕円形となるように形成することで、曲がり梁部における強度を確保している。したがって、特許文献１〜３に開示の構成では、チェーンが溝形腕部の近傍に位置した状態では、チェーンのもつれが生じるのを解消することが難しい。 In recent years, the strength of chains has been improved, and the diameter of metal parts of the chains has been reduced accordingly. In that case, since the diameter of the ring hole surrounded by the metal ring of the chain is also reduced, it is necessary to reduce the diameter of the curved beam portion. Here, in the configurations disclosed in Patent Documents 1 to 3, even if the diameter of the curved beam portion is reduced, it is necessary to secure sufficient strength thereof. Therefore, in the configurations disclosed in Patent Documents 1 to 3, the curved beam portion is formed so that the cross section of the curved beam portion becomes elliptical toward the groove-shaped arm portion, thereby ensuring the strength in the curved beam portion. Therefore, with the configurations disclosed in Patent Documents 1 to 3, it is difficult to eliminate the occurrence of entanglement of the chain when the chain is located near the grooved arm portion.

本発明は上記の事情に鑑みなされたもので、溝形腕部の近傍でも曲がり梁部の断面を円形として、他の部材を回動自在な状態で連結可能とする共に、曲がり梁部の強度を十分に確保することが可能な結合金具を提供することを目的とする。 The present invention has been made in view of the above circumstances, and even in the vicinity of the groove-shaped arm portion, the cross section of the curved beam portion is circular so that other members can be rotatably connected and the strength of the curved beam portion is increased. It is an object of the present invention to provide a coupling fitting that can sufficiently secure the above.

上記課題を解決するために、本発明の第１の観点によると、他の結合金具と連結ピンを介して連結されることにより連結具を構成する結合金具であって、連結ピンが挿入される貫通孔を備える挿込腕部と、連結ピンが挿入される挿通孔を備えると共に、一端側に位置する挿込腕部と幅方向において対向する他端側に位置する溝形腕部と、挿込腕部と溝形腕部の間に設けられる曲がり梁部と、を備え、曲がり梁部は、その延伸方向の全体に亘り、該延伸方向と直交する断面が円形に設けられていて、曲がり梁部と溝形腕部の間には、曲がり梁部の延伸長さを低減する弧状張出部が設けられていて、弧状張出部の横断面において幅方向に直交する厚み方向の厚み寸法は、その全体が曲がり梁部の断面の直径の２〜２．５倍に設けられていて、曲がり梁部と弧状張出部とで囲まれた囲繞孔の中心を通りかつ弧状張出部のうち溝形腕部とは反対側の端部に差し掛かる線と、囲繞孔の中心を通りつつ溝形腕部が延伸する方向に平行な中心線との間の角度は、４５度〜６０度の範囲内である、ことを特徴とする結合金具が提供される。 In order to solve the above-mentioned problems, according to a first aspect of the present invention, a coupling fitting is configured by being coupled to another coupling fitting via a coupling pin, and the coupling pin is inserted. An insertion arm portion having a through hole, an insertion hole into which the connecting pin is inserted, and a groove-shaped arm portion on the other end side that opposes the insertion arm portion on one end side in the width direction, A curved beam portion provided between the recessed arm portion and the grooved arm portion, and the curved beam portion is provided with a circular cross section orthogonal to the extending direction over the entire extending direction, An arcuate bulge that reduces the extension length of the curved beam is provided between the beam and the grooved arm, and the thickness dimension in the thickness direction orthogonal to the width direction in the cross section of the arcuate bulge. , the entire bends provided in 2-2.5 times the diameter of the cross section of the beam portion, curved beam portions and arcuate protruding portion and enclosed by surrounding the hole around the street and the arcuate projecting portion The angle between the line approaching the end on the opposite side of the groove-shaped arm and the center line parallel to the direction in which the groove-shaped arm extends while passing through the center of the surrounding hole is 45 to 60 degrees. A coupling fitting is provided which is within the range .

また、本発明の他の側面は、上述の発明において、弧状張出部の内周部分は、曲がり梁部と連なる円弧状の軌跡の一部を構成している、ことが好ましい。 Further, according to another aspect of the present invention, in the above-mentioned invention, it is preferable that an inner peripheral portion of the arc-shaped overhang portion constitutes a part of an arc-shaped locus continuous with the curved beam portion.

さらに、本発明の他の側面は、上述の発明において、弧状張出部の厚み方向の両端側に位置する表面および裏面は、溝形腕部の厚み方向の両端側に位置する表面および裏面と面一に設けられている、ことが好ましい。 Further, in another aspect of the present invention, in the above-mentioned invention, the front surface and the back surface located on both end sides in the thickness direction of the arcuate overhang portion are the front surface and the back surface located on both end sides in the thickness direction of the groove-shaped arm portion. It is preferable that they are provided flush with each other.

また、本発明の他の側面は、上述した発明に係る結合金具を２つ連結して環状として使用される連結具であって、２つの結合金具のうちの一方の結合金具の挿込腕部の貫通孔と、２つの結合金具の他方の結合金具の溝形腕部の挿通孔とが位置合わせされ、２つの結合金具のうちの一方の結合金具の溝形腕部の挿通孔と、２つの結合金具のうちの他方の結合金具の挿込腕部の貫通孔とが位置合わせされ、その位置合わせ状態で、連結ピンが貫通孔および挿通孔に挿通されたことで、２つの結合金具が連結された、ことが好ましい。 Another aspect of the present invention is a connector used as an annular shape by connecting two coupling fittings according to the invention described above, and an inserting arm portion of one of the two coupling fittings. And the insertion hole of the groove-shaped arm portion of the other coupling metal fitting of the two coupling metal fittings are aligned, and the insertion hole of the groove-shaped arm portion of one of the two coupling metal fittings is The other coupling metal fitting out of the two coupling metal fittings is aligned with the through hole of the insertion arm portion, and the coupling pin is inserted into the through hole and the insertion hole in the aligned state, so that the two coupling metal fittings are It is preferably linked.

本発明によると、結合金具において、溝形腕部の近傍でも曲がり梁部の断面を円形として、連結される他の部材を回動自在とすると共に、曲がり梁部の強度を十分に確保することが可能となる。 According to the present invention, in the coupling fitting, the cross section of the curved beam portion is circular even in the vicinity of the groove-shaped arm portion so that the other members to be coupled are rotatable and the strength of the curved beam portion is sufficiently ensured. Is possible.

本発明の一実施の形態に係る結合金具の構成を示す平面図である。It is a top view which shows the structure of the coupling metal fitting which concerns on one embodiment of this invention. 図１に示す結合金具が一対連結された連結具を構成した状態を示す斜視図である。It is a perspective view which shows the state which comprised the coupling tool which the coupling metal fittings shown in FIG. 1 were paired. 図１に示す結合金具を挿込腕部および溝形腕部側から見た状態を示す正面図である。It is a front view which shows the state which looked at the coupling metal fitting shown in FIG. 1 from the insertion arm part and the groove-shaped arm part side. 図１におけるI−I線に沿って結合金具を切断した状態を示す横断面図である。FIG. 2 is a transverse cross-sectional view showing a state in which the coupling fitting is cut along the line I-I in FIG. 1. 図１に示す結合金具を挿込腕部側から見た状態を示す側面図である。It is a side view which shows the state which looked at the coupling metal fitting shown in FIG. 1 from the insertion arm part side. 図１に示す結合金具を溝形腕部側から見た状態を示す側面図である。It is a side view which shows the state which looked at the coupling metal fitting shown in FIG. 1 from the grooved arm part side. 図１におけるII−II線に沿って結合金具を切断した状態を示す横断面図である。FIG. 2 is a transverse cross-sectional view showing a state in which the coupling fitting is cut along the line II-II in FIG. 1. 比較例としての現状の結合金具のうち、挿込腕部側の応力集中の様子を示す斜視図である。It is a perspective view which shows a mode of stress concentration in the insertion arm part side among the present coupling metal fittings as a comparative example. 比較例としての現状の結合金具のうち、溝形腕部側の応力集中の様子を示す斜視図である。FIG. 11 is a perspective view showing a state of stress concentration on the grooved arm portion side in the current coupling fitting as a comparative example. 本実施の形態の結合金具のうち、挿込腕部側の応力集中の様子を示す斜視図である。It is a perspective view which shows a mode of stress concentration in the insertion arm part side among the coupling fittings of this embodiment. 本実施の形態の結合金具のうち、溝形腕部側の応力集中の様子を示す斜視図である。FIG. 6 is a perspective view showing a state of stress concentration on the grooved arm portion side in the coupling fitting of the present embodiment.

以下、本発明の一実施の形態に係る、結合金具１０について、図面に基づいて説明する。なお、以下の説明においては、必要に応じてＸＹＺ直交座標系を用いて説明することとする。ＸＹＺ直交座標系においてＸ方向とは、図２における連結ピン１００の軸方向とし、Ｘ１側は図２における右側を指し、Ｘ２側はそれとは逆の左側を指す。また、Ｙ方向とは、図１および図２においてＸ方向（幅方向）とは直交しつつ挿込腕部２０および溝形腕部３０が延伸する方向を指し、Ｙ１側は図１および図２における紙面奥側を指し、Ｙ２側は図１および図２における紙面手前側を指す。また、Ｚ方向（厚み方向）とは、Ｘ方向およびＹ方向に直交する方向を指し、Ｚ１側は図３における紙面奥側を指し、Ｚ２側は図３における紙面手前側を指す。 Hereinafter, a coupling fitting 10 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, an XYZ rectangular coordinate system will be used as needed. In the XYZ orthogonal coordinate system, the X direction is the axial direction of the connecting pin 100 in FIG. 2, the X1 side refers to the right side in FIG. 2, and the X2 side refers to the opposite left side. In addition, the Y direction refers to a direction in which the insertion arm portion 20 and the channel-shaped arm portion 30 extend while being orthogonal to the X direction (width direction) in FIGS. 1 and 2, and the Y1 side is illustrated in FIGS. In FIG. 1, the Y2 side refers to the front side of the paper in FIGS. Further, the Z direction (thickness direction) refers to a direction orthogonal to the X direction and the Y direction, the Z1 side refers to the back side of the paper in FIG. 3, and the Z2 side refers to the front side of the paper in FIG.

＜結合金具の構成について＞
図１は、結合金具１０の構成を示す平面図である。図２は、一対の結合金具１０が連結された連結具１１を構成した状態を示す斜視図である。 <About the structure of the coupling hardware>
FIG. 1 is a plan view showing the configuration of the coupling fitting 10. FIG. 2 is a perspective view showing a state in which a coupling tool 11 in which a pair of coupling fittings 10 are coupled is configured.

図２に示すように、一対の結合金具１０は、連結ピン１００を介して連結されている。連結ピン１００は、後述する貫通孔２１と挿通孔３３ａ，３３ｂを位置合わせした状態で挿通させることで、一対の結合金具１０を連結する。この連結ピン１００は、一方および他方の端部が、中央部分よりも若干太くなっている。そして、一方および他方の端部は、それぞれ貫通孔２１および挿通孔３３ａ，３３ｂに位置すると共に、連結ピン１００の中央部分には円筒状のバネカラー１１０が取り付けられる。 As shown in FIG. 2, the pair of coupling fittings 10 are coupled via a coupling pin 100. The connecting pin 100 connects the pair of coupling fittings 10 by inserting the through hole 21 described later and the insertion holes 33a and 33b in the aligned state. The connecting pin 100 has one end and the other end that are slightly thicker than the central portion. The one end and the other end are respectively located in the through hole 21 and the insertion holes 33a and 33b, and a cylindrical spring collar 110 is attached to the central portion of the connecting pin 100.

バネカラー１１０の孔の内径は、貫通孔２１の内径よりも若干大きくなっており、この孔の内部には、連結ピン１００を圧入した際にこれを締め付けるバネが設けられている。したがって、バネカラー１１０が連結ピン１００の中央部分に取り付けられることで、連結ピン１００が貫通孔２１から抜けるのが阻止される。 The inner diameter of the hole of the spring collar 110 is slightly larger than the inner diameter of the through hole 21, and a spring that tightens the connecting pin 100 when the connecting pin 100 is press-fitted is provided inside the hole. Therefore, by attaching the spring collar 110 to the central portion of the connecting pin 100, the connecting pin 100 is prevented from coming off from the through hole 21.

以上のような連結具１１を構成する結合金具１０は、たとえば鉄鋼といった金属を材質としている。また、図１に示すように、結合金具１０は、挿込腕部２０と、溝形腕部３０と、弧状張出部４０と、曲がり梁部５０とを備えていて、これら各部が、たとえば鍛造によって一体的に形成されている。また、結合金具１０は、これら各部によって囲まれた囲繞孔Ｓ１を備えていて、その囲繞孔Ｓ１には、外部のチェーンやリンク部材等が挿入される。 The metal fitting 10 that constitutes the connecting tool 11 as described above is made of a metal such as steel. Further, as shown in FIG. 1, the coupling fitting 10 includes an insertion arm portion 20, a groove-shaped arm portion 30, an arc-shaped overhanging portion 40, and a curved beam portion 50, and these respective portions are, for example, It is integrally formed by forging. Further, the coupling fitting 10 is provided with a surrounding hole S1 surrounded by these respective parts, and an external chain, a link member, or the like is inserted into the surrounding hole S1.

図３は、結合金具１０を挿込腕部２０および溝形腕部３０側から見た状態を示す正面図である。図４は、図１におけるI−I線に沿って結合金具１０を切断した状態を示す横断面図である。図５は、結合金具１０を挿込腕部２０側から見た状態を示す側面図である。 FIG. 3 is a front view showing a state in which the coupling fitting 10 is viewed from the insertion arm 20 and the groove arm 30 side. FIG. 4 is a cross-sectional view showing a state in which the coupling fitting 10 is cut along the line I-I in FIG. FIG. 5 is a side view showing a state in which the coupling fitting 10 is viewed from the insertion arm 20 side.

図１および図５に示すように、挿込腕部２０は、結合金具１０の一端側に位置している部分であり、溝形腕部３０の溝部３２に差し込まれる部分である。図５に示すように、挿込腕部２０においては、Ｙ１側の外周面は円弧を描く円弧面２２となっている。また、図３および図４に示すように、挿込腕部２０のうち、Ｚ１側の外周面も円弧面２３となっていて、チェーンの挿入時には金属輪で囲まれたリング孔に沿わせることができる。このような円弧面２３が存在する場合、円弧面２３が存在しない場合と比較して、強度を向上させることができる。しかしながら、Ｚ２側の外周面は円弧面とはなっておらず、該外周面は平面状に設けられている。しかしながら、Ｚ１側およびＺ２側の少なくとも一方の外周面を円弧面としても良く、Ｚ１側およびＺ２側の両方の外周面を円弧面ではなく平面状としても良い。 As shown in FIGS. 1 and 5, the insertion arm portion 20 is a portion located on one end side of the coupling fitting 10 and is a portion inserted into the groove portion 32 of the groove-shaped arm portion 30. As shown in FIG. 5, in the insertion arm portion 20, the outer peripheral surface on the Y1 side is an arc surface 22 that draws an arc. Further, as shown in FIGS. 3 and 4, the Z1 side outer peripheral surface of the insertion arm portion 20 is also an arcuate surface 23, and the insertion arm portion 20 should be along a ring hole surrounded by a metal ring when the chain is inserted. You can When such an arcuate surface 23 exists, the strength can be improved as compared with the case where the arcuate surface 23 does not exist. However, the outer peripheral surface on the Z2 side is not a circular arc surface, and the outer peripheral surface is provided in a flat shape. However, at least one of the outer peripheral surfaces on the Z1 side and the Z2 side may be an arcuate surface, or both outer peripheral surfaces on the Z1 side and the Z2 side may be flat surfaces instead of arcuate surfaces.

なお、挿込腕部２０のうち、幅方向（Ｘ方向）の両側の外周面（Ｘ１側の外周面およびＸ２側の外周面）は平面状に形成されている。また、挿込腕部２０の断面積は、曲がり梁部５０よりも大きくなるように設けられている。 The outer peripheral surfaces (the outer peripheral surface on the X1 side and the outer peripheral surface on the X2 side) on both sides in the width direction (X direction) of the insertion arm portion 20 are formed in a flat shape. Further, the cross-sectional area of the insertion arm portion 20 is provided so as to be larger than that of the curved beam portion 50.

この挿込腕部２０は、図１、図３〜図５に示すように、曲がり梁部５０よりもＺ方向の寸法（厚み寸法）が大きく設けられている。しかしながら、挿込腕部２０は、曲がり梁部５０よりもＸ方向の寸法（幅寸法）が小さく設けられている。それにより、チェーンの金属輪で囲まれたリング孔に挿込腕部２０を差し込むことができ、チェーンを曲がり梁部５０に位置させることができる。また、Ｘ方向の寸法（幅寸法）が小さくなることで、挿込腕部２０を溝部３２に位置させ易くなっている。 As shown in FIGS. 1 and 3 to 5, the insertion arm portion 20 has a larger dimension (thickness dimension) in the Z direction than the curved beam portion 50. However, the insertion arm portion 20 is provided with a dimension (width dimension) in the X direction smaller than that of the curved beam portion 50. Thereby, the insertion arm portion 20 can be inserted into the ring hole surrounded by the metal ring of the chain, and the chain can be positioned on the curved beam portion 50. Further, since the dimension (width dimension) in the X direction is reduced, it becomes easier to position the insertion arm portion 20 in the groove portion 32.

この挿込腕部２０には、貫通孔２１が設けられている。貫通孔２１は、挿込腕部２０を幅方向（Ｘ方向）に沿って貫いており、上述した連結ピン１００の一方の端部を位置させる部分である。なお、挿込腕部２０のＺ１側およびＺ２側の外周面のうち、曲がり梁部５０側（Ｙ２側）には、傾斜部２４も設けられていて、挿込腕部２０と曲がり梁部５０の間に段差部分が存在しないようにしている。 The insertion arm 20 is provided with a through hole 21. The through hole 21 is a portion that penetrates the insertion arm portion 20 along the width direction (X direction) and positions one end portion of the above-described connecting pin 100. It should be noted that an inclined portion 24 is also provided on the curved beam portion 50 side (Y2 side) of the Z1 side and Z2 side outer peripheral surfaces of the insertion arm portion 20, and the insertion arm portion 20 and the curved beam portion 50 are provided. There is no step between them.

図６は、結合金具１０を溝形腕部３０側から見た状態を示す側面図である。図１に示すように、溝形腕部３０は、結合金具１０の他端側に位置している部分である。この溝形腕部３０は、厚み方向（Ｚ方向）に沿って一対の対向片部３１ａ，３１ｂを有していて、それらの対向片部３１ａ，３１ｂの間に、挿込腕部２０が挿し込まれる溝部３２が設けられている。したがって、溝部３２の幅寸法（対向片部３１ａと対向片部３１ｂの対向間隔）は、挿込腕部２０の挿し込みに対応した間隔となっている。 FIG. 6 is a side view showing a state in which the coupling fitting 10 is viewed from the groove-shaped arm portion 30 side. As shown in FIG. 1, the groove-shaped arm portion 30 is a portion located on the other end side of the coupling fitting 10. The groove-shaped arm portion 30 has a pair of facing piece portions 31a and 31b along the thickness direction (Z direction), and the insertion arm portion 20 is inserted between the facing piece portions 31a and 31b. A groove 32 to be inserted is provided. Therefore, the width dimension of the groove portion 32 (the facing distance between the facing piece portion 31a and the facing piece portion 31b) is a distance corresponding to the insertion of the insertion arm portion 20.

図３および図４に示すように、それぞれの対向片部３１ａ，３１ｂには、挿通孔３３ａ，３３ｂが設けられている。挿通孔３３ａ，３３ｂは、対向片部３１ａ，３１ｂを幅方向（Ｘ方向）に沿って貫いており、また貫通孔２１と同軸上となるように形成されている。これらの挿通孔３３ａ，３３ｂは、連結ピン１００の他方の端部を位置させる部分である。なお、挿通孔３３ａ，３３ｂは、対向片部３１ａ，３１ｂの厚み方向（Ｚ方向）の中央に設けられているが、厚み方向（Ｚ方向）の中央から若干ずれた位置に設けられるようにしても良い。 As shown in FIGS. 3 and 4, insertion holes 33a and 33b are provided in the facing piece portions 31a and 31b, respectively. The insertion holes 33 a and 33 b penetrate the facing piece portions 31 a and 31 b along the width direction (X direction), and are formed so as to be coaxial with the through hole 21. These insertion holes 33a and 33b are portions for locating the other end of the connecting pin 100. Although the insertion holes 33a and 33b are provided at the center of the facing piece portions 31a and 31b in the thickness direction (Z direction), the insertion holes 33a and 33b are provided at positions slightly deviated from the center of the thickness direction (Z direction). Is also good.

なお、溝形腕部３０においては、Ｙ１側の外周面は円弧を描く円弧面３４となっているが、円弧面３４以外の平面状としても良い。 In addition, in the grooved arm portion 30, the outer peripheral surface on the Y1 side is a circular arc surface 34 that draws a circular arc, but it may be a flat surface other than the circular arc surface 34.

また、図３、図４および図６に示すように、対向片部３１ａ，３１ｂは、挿込腕部２０よりもＺ方向の寸法（厚み寸法）が大きく設けられている。したがって、対向片部３１ａ，３１ｂ（溝形腕部３０）は、曲がり梁部５０よりも厚み方向（Ｚ方向）の寸法が大きい部分となっている。また、溝部３２に挿込腕部２０を位置させた状態では、挿込腕部２０は、対向片部３１ａ，３１ｂによって保護される状態となっている。 Further, as shown in FIGS. 3, 4, and 6, the facing piece portions 31 a and 31 b are provided to have a larger dimension (thickness dimension) in the Z direction than the insertion arm portion 20. Therefore, the facing piece portions 31 a and 31 b (groove-shaped arm portion 30) are portions having a larger dimension in the thickness direction (Z direction) than the curved beam portion 50. Further, when the insertion arm 20 is positioned in the groove 32, the insertion arm 20 is protected by the facing pieces 31a and 31b.

図７は、図１におけるII−II線に沿って結合金具１０を切断した状態を示す横断面図である。図１、図６および図７に示すように、溝形腕部３０のＹ２側には、弧状張出部４０が連続して設けられている。弧状張出部４０の曲がり梁部５０に対する厚み方向（Ｚ方向）の突出量は、厚み方向（Ｚ方向）の一方側（Ｚ１側）と、厚み方向（Ｚ方向）の他方側（Ｚ２側）とで、同程度となっている。しかしながら、これらの突出量が異なるものとしても良い。この弧状張出部４０の内周部分は、円弧状の軌跡の一部を構成している。したがって、弧状張出部４０の内周部分は、曲がり梁部５０の内周部分と共に、結合金具１０の囲繞孔Ｓ１を構成する部分である。換言すると、弧状張出部４０が存在することにより、曲がり梁部５０の長さは短く設けられている。 FIG. 7 is a cross-sectional view showing a state in which the coupling fitting 10 is cut along the line II-II in FIG. As shown in FIGS. 1, 6 and 7, an arcuate overhanging portion 40 is continuously provided on the Y2 side of the groove-shaped arm portion 30. The amount of protrusion of the arc-shaped overhanging portion 40 in the thickness direction (Z direction) with respect to the curved beam portion 50 is one side (Z1 side) in the thickness direction (Z direction) and the other side (Z2 side) in the thickness direction (Z direction). And, it is about the same. However, these protrusion amounts may be different. The inner peripheral portion of the arcuate overhanging portion 40 constitutes a part of an arcuate locus. Therefore, the inner peripheral portion of the arc-shaped overhanging portion 40, together with the inner peripheral portion of the curved beam portion 50, constitutes the surrounding hole S1 of the coupling fitting 10. In other words, due to the existence of the arcuate overhanging portion 40, the curved beam portion 50 is provided with a short length.

図１に示すように、本実施の形態では、囲繞孔Ｓ１の中心を通りかつ弧状張出部４０のＹ２側の端部４０ａに差し掛かる線Ｌ２と、囲繞孔Ｓ１の中心を通りつつＹ方向に平行な中心線Ｌ１との間の角度θは、４５度〜６０度の範囲内であることが好ましい。この範囲内であれば、たとえば囲繞孔Ｓ１に一対のチェーンを玉掛けした場合に、それらのチェーンの間の開き角を十分に確保することが可能となる。また、曲がり梁部５０の寸法を短くして、後述する最大応力集中部５１での応力集中を低減することができる。 As shown in FIG. 1, in the present embodiment, a line L2 passing through the center of the surrounding hole S1 and approaching the Y2-side end 40a of the arcuate overhanging portion 40 and the Y direction while passing through the center of the surrounding hole S1. The angle θ with the center line L1 parallel to is preferably in the range of 45 degrees to 60 degrees. Within this range, for example, when a pair of chains are slid on the surrounding hole S1, it is possible to secure a sufficient opening angle between the chains. In addition, the dimension of the curved beam portion 50 can be shortened to reduce stress concentration in the maximum stress concentration portion 51 described later.

ここで、図７に示すように、弧状張出部４０においては、その厚み寸法Ｍ１（Ｚ方向の寸法）が、曲がり梁部５０の直径Ｄ１よりも大きく設けられていて、溝形腕部３０の厚み寸法（Ｚ方向の寸法）と同程度に設けられている。この厚み寸法Ｍ１は、直径Ｄ１の２倍〜２．５倍程度の範囲内に設けられている。また、弧状張出部４０のＺ１側の表面およびＺ２側の裏面は、溝形腕部３０のＺ１側の表面およびＺ２側の裏面と面一となるように設けられている。したがって、弧状張出部４０は、その断面積が大きくなり、曲がり梁部５０に荷重が作用しても変形し難い部分となっている。また、弧状張出部４０においては、囲繞孔Ｓ１に面する内周部分における応力を低減可能となっている。 Here, as shown in FIG. 7, in the arcuate overhanging portion 40, the thickness dimension M1 (dimension in the Z direction) is provided larger than the diameter D1 of the curved beam portion 50, and the groove-shaped arm portion 30 is provided. It is provided in the same degree as the thickness dimension (dimension in the Z direction) of. The thickness dimension M1 is provided within a range of about 2 to 2.5 times the diameter D1. Further, the Z1 side surface and the Z2 side back surface of the arcuate overhanging portion 40 are provided so as to be flush with the Z1 side surface and the Z2 side back surface of the grooved arm portion 30. Therefore, the arcuate overhanging portion 40 has a large cross-sectional area, and is a portion that is difficult to be deformed even when a load acts on the curved beam portion 50. Further, in the arc-shaped overhanging portion 40, it is possible to reduce the stress in the inner peripheral portion facing the surrounding hole S1.

また、曲がり梁部５０は、挿込腕部２０と弧状張出部４０の間に位置する円弧状の梁部分であり、チェーンやリンク部材からの荷重が作用する部分である。この曲がり梁部５０は、その断面が円形状に設けられていて、周方向の全体に亘って同一径となるように設けられている。したがって、曲がり梁部５０にチェーンを掛けた場合、曲がり梁部５０に沿ってチェーンがスライド可能となっており、また曲がり梁部５０の周方向のいずれの位置においても、その位置においてチェーンが回動可能となっている。このため、曲がり梁部５０のいずれの部位においても、チェーンのもつれが生じるのを防止可能となっている。 The curved beam portion 50 is an arc-shaped beam portion located between the insertion arm portion 20 and the arc-shaped overhang portion 40, and is a portion to which a load from the chain or link member acts. The curved beam portion 50 has a circular cross section, and is provided so as to have the same diameter over the entire circumferential direction. Therefore, when a chain is hung on the curved beam part 50, the chain is slidable along the curved beam part 50, and at any position in the circumferential direction of the curved beam part 50, the chain rotates at that position. It is movable. For this reason, it is possible to prevent the chain from becoming entangled at any part of the curved beam part 50.

＜応力集中に関して＞
以上のような構成の結合金具１０に関する応力集中の様子について、以下に説明する。図８は、比較例としての現状の結合金具１０Ｃのうち、挿込腕部２０Ｃ側の応力集中の様子を示す斜視図である。図９は、比較例としての現状の結合金具１０Ｃのうち、溝形腕部３０Ｃ側の応力集中の様子を示す斜視図である。 <Regarding stress concentration>
The state of stress concentration in the coupling fitting 10 having the above-described configuration will be described below. FIG. 8 is a perspective view showing a state of stress concentration on the insertion arm 20C side in the current coupling fitting 10C as a comparative example. FIG. 9 is a perspective view showing a state of stress concentration on the grooved arm portion 30C side in the current coupling fitting 10C as a comparative example.

なお、図８および図９では、結合金具１０ＣにおいてＹ方向を鉛直方向に沿うように配置しており、また、曲がり梁部５０Ｃの内周側のうち、中心線Ｌ１と交差する負荷部分５３Ｃに、鉛直方向の下側（Ｙ２側）に向かうような荷重を付与している。 8 and 9, the Y direction is arranged along the vertical direction in the coupling fitting 10C, and the load portion 53C, which intersects with the center line L1 on the inner peripheral side of the curved beam portion 50C, is arranged. , A load is applied to the lower side (Y2 side) in the vertical direction.

図８および図９に示す結合金具１０Ｃにおいては、曲がり梁部５０Ｃの溝形腕部３０Ｃ付近では、曲がり梁部５０Ｃの断面は完全な円形ではなく、長円または楕円となっている。したがって、曲がり梁部５０Ｃのうち、溝形腕部３０Ｃ側にチェーンが位置した場合、チェーンにもつれが生じる状態となっている。 In the fitting 10C shown in FIGS. 8 and 9, in the vicinity of the groove-shaped arm portion 30C of the bent beam portion 50C, the cross section of the bent beam portion 50C is not a perfect circle but an ellipse or an ellipse. Therefore, when the chain is located on the grooved arm portion 30C side of the curved beam portion 50C, the chain is entangled.

また、図８および図９に示す結合金具１０Ｃでは、強度を向上させるために、たとえば焼き入れ等の熱処理やその他の処理を施すことで、全体的に硬くなるように形成している。加えて、材質が硬くなる場合、加工時に形成された傷等が疲労破壊の起点になり得ることから、たとえばリーマ等を用いて貫通孔２１や挿通孔３３ａ，３３ｂの加工精度を向上させて傷等の発生を防いでいる。加えて、結合金具１０Ｃでは、その表面にカチオン塗装を施していて、他の塗装と比較して塗装の膜厚を薄くしている。それにより、特に曲がり梁部５０Ｃの溝形腕部３０Ｃ側でのチェーンのもつれが生じる範囲を極力低減するようにしているが、完全にはもつれを解消することはできず、一部の範囲でもつれが生じる状態となっている。 In addition, in the coupling fitting 10C shown in FIGS. 8 and 9, in order to improve the strength, heat treatment such as quenching and other treatments are performed so as to be hardened as a whole. In addition, when the material becomes hard, scratches and the like formed at the time of processing can be the starting point of fatigue fracture. Therefore, for example, a reamer or the like is used to improve the processing accuracy of the through hole 21 and the insertion holes 33a and 33b. Etc. are prevented from occurring. In addition, the coupling fitting 10C has its surface coated with a cation to make the coating thinner than other coatings. As a result, the range in which the chain entanglement on the grooved arm portion 30C side of the curved beam portion 50C particularly occurs is reduced as much as possible, but the entanglement cannot be completely eliminated, and the chain entanglement cannot be completely eliminated. It is in a state where entanglement occurs.

図８に示すように、現状の結合金具１０Ｃでは、曲がり梁部５０Ｃのうち、挿込腕部２０Ｃに隣接するＹ１側の内周側の部位は、曲げモーメントが最大となり、またその内周側の部位の曲率半径が大きくなるように変形し、加えて荷重負荷によって鉛直下向きにもひずむことから、最も応力が集中する最大応力集中部５１Ｃとなっている。一例として、ある荷重を負荷したとき、最大応力集中部５１Ｃでの応力が６２８Ｎ／ｍｍ２ となった。また、図９に示すように、現状の結合金具１０Ｃでは、曲がり梁部５０Ｃのうち、溝形腕部３０Ｃに隣接するＹ１側の内周側の部位も曲げモーメントが最大となり、またその内周側の部位の曲率半径が大きくなるように変形し、加えて荷重負荷によって鉛直下向きにもひずむことから、応力が集中している第２応力集中部５２Ｃとなっている。ただし、第２応力集中部５２Ｃでは、最大応力集中部５１Ｃよりも応力は小さいものの、最大応力集中部５１Ｃ以外の部分と比較して応力が高くなっている。 As shown in FIG. 8, in the current coupling metal fitting 10C, the bending moment 50C has a maximum bending moment at the Y1 side inner peripheral portion adjacent to the inserting arm portion 20C, and the inner peripheral side thereof. The portion is deformed so that the radius of curvature becomes large, and in addition, it is deformed vertically downward due to the load load, so that it is the maximum stress concentration portion 51C where the stress is most concentrated. As an example, when a certain load was applied, the stress in the maximum stress concentrating portion 51C became 628 N/mm 2 . In addition, as shown in FIG. 9, in the current coupling fitting 10C, the bending moment becomes maximum also at the portion of the curved beam portion 50C on the Y1 side inner peripheral side adjacent to the grooved arm portion 30C, and Since the side portion is deformed to have a large radius of curvature and is also deformed vertically downward due to a load load, it is the second stress concentration portion 52C in which stress is concentrated. However, although the stress in the second stress concentrating portion 52C is smaller than that in the maximum stress concentrating portion 51C, the stress is higher than that in the portion other than the maximum stress concentrating portion 51C.

これに対して、本実施の形態の結合金具１０の応力集中は、図１０および図１１に示すようになっている。図１０は、本実施の形態の結合金具１０のうち、挿込腕部２０側の応力集中の様子を示す斜視図である。図１１は、本実施の形態の結合金具１０のうち、溝形腕部３０側の応力集中の様子を示す斜視図である。 On the other hand, the stress concentration of the coupling fitting 10 of the present embodiment is as shown in FIGS. 10 and 11. FIG. 10 is a perspective view showing how stress is concentrated on the insertion arm 20 side of the coupling fitting 10 of the present embodiment. FIG. 11 is a perspective view showing a state of stress concentration on the side of the grooved arm portion 30 in the coupling fitting 10 of the present embodiment.

図１０に示すように、本実施の形態の結合金具１０においても、曲がり梁部５０のうち、挿込腕部２０に隣接するＹ１側の内周側の部位は、上述した最大応力集中部５１Ｃと同様に、最も応力が集中する最大応力集中部５１となっている。しかしながら、図８と同じ荷重を負荷したとき、最大応力集中部５１での応力が５４０Ｎ／ｍｍ２ となった。また、図１１に示すように、本実施の形態の結合金具１０にも、曲がり梁部５０のうち、弧状張出部４０に隣接するＹ１側の内周側の部位も応力が集中している第２応力集中部５２となっているが、その第２応力集中部５２では、最大応力集中部５１よりも応力は大幅に小さくなっている。 As shown in FIG. 10, also in the coupling fitting 10 of the present embodiment, the portion of the curved beam portion 50 on the Y1 side inner peripheral side adjacent to the insertion arm portion 20 has the above-described maximum stress concentration portion 51C. Similarly to the above, the maximum stress concentration portion 51 where the stress is most concentrated is formed. However, when the same load as in FIG. 8 was applied, the stress in the maximum stress concentration part 51 became 540 N/mm 2 . Further, as shown in FIG. 11, also in the coupling fitting 10 of the present embodiment, the stress is concentrated on the portion of the curved beam portion 50 on the inner peripheral side on the Y1 side adjacent to the arcuate overhanging portion 40. Although it is the second stress concentration portion 52, the stress in the second stress concentration portion 52 is significantly smaller than that in the maximum stress concentration portion 51.

図８と図１０の比較から明らかなように、弧状張出部４０の有無により、曲がり梁部５０の長さ（スパン）が短くなり、その結果、最大応力集中部５１での応力が低減されている。また、弧状張出部４０の存在により、第２応力集中部５２Ｃに相当する部分では、応力が大幅に低減されるので、その第２応力集中部５２Ｃでの伸びやひずみが大幅に低減される。 As is clear from the comparison between FIG. 8 and FIG. 10, the length (span) of the curved beam portion 50 is shortened depending on the presence or absence of the arcuate overhanging portion 40, and as a result, the stress in the maximum stress concentration portion 51 is reduced. ing. Further, due to the existence of the arcuate overhanging portion 40, the stress is significantly reduced in the portion corresponding to the second stress concentrating portion 52C, so that the elongation and strain in the second stress concentrating portion 52C are significantly reduced. ..

また、曲がり梁部５０Ｃでは、荷重の負荷部分５３Ｃから挿込腕部２０Ｃ側の端部までの距離と、荷重の負荷部分５３Ｃから溝形腕部３０Ｃ側の端部までの距離とが、図８および図９から均等に近いと考えられる。しかしながら、本実施の形態では、弧状張出部４０が存在することにより、曲がり梁部５０では、荷重の負荷部分５３から挿込腕部２０側の端部までの距離と、荷重の負荷部分５３から弧状張出部４０側の端部までの距離とが、図１０および図１１から変動するので、荷重の負荷部分５３からの距離が均等ではなくなる。 Further, in the curved beam portion 50C, the distance from the load portion 53C to the end portion on the insertion arm portion 20C side and the distance from the load portion 53C to the groove arm portion 30C side are 8 and FIG. 9 are considered to be nearly equal. However, in the present embodiment, due to the existence of the arcuate overhanging portion 40, in the curved beam portion 50, the distance from the load applying portion 53 to the end portion on the insertion arm 20 side and the load applying portion 53. 10 to FIG. 11, the distance from the load portion 53 to the load is not uniform.

そして、曲がり梁部５０のうち、荷重の負荷部分５３に近い弧状張出部４０側の梁端部５４での荷重が、挿込腕部２０側の端部での荷重よりも大きいと考えられるので、曲がり梁部５０Ｃの挿込腕部２０Ｃ側の端部と、曲がり梁部５０の挿込腕部２０側の端部とでは、挿込腕部２０側の端部の方が曲げモーメントが若干小さくなり、それによって挿込腕部２０側の端部の応力が小さくなる、と考えることができる。 Then, it is considered that the load at the beam end portion 54 of the curved beam portion 50 on the side of the arcuate overhanging portion 40 near the load portion 53 of the load is larger than the load at the end portion of the insertion arm portion 20 side. Therefore, between the end portion of the curved beam portion 50C on the insertion arm portion 20C side and the end portion of the curved beam portion 50 on the insertion arm portion 20 side, the end portion on the insertion arm portion 20 side has a bending moment. It can be considered that the stress becomes slightly smaller, and thereby the stress at the end portion on the insertion arm 20 side becomes smaller.

＜効果について＞
以上のような構成の結合金具１０によると、曲がり梁部５０は、その延伸方向の全体に亘り、該延伸方向と直交する断面が円形に設けられている。また、曲がり梁部５０と溝形腕部３０の間には、曲がり梁部５０の延伸長さを低減する弧状張出部４０が設けられていて、その弧状張出部４０の断面において幅方向に直交する厚み方向（Ｚ方向）の厚み寸法は、曲がり梁部５０の断面の直径よりも大きく設けられている。 <About effect>
According to the coupling member 10 having the above-described configuration, the curved beam portion 50 is provided with a circular cross section orthogonal to the extending direction over the entire extending direction thereof. Further, between the curved beam portion 50 and the groove-shaped arm portion 30, there is provided an arc-shaped overhanging portion 40 that reduces the extension length of the bent beam portion 50, and the arc-shaped overhanging portion 40 has a cross-section in the width direction. The thickness dimension in the thickness direction (Z direction) orthogonal to is larger than the diameter of the cross section of the curved beam portion 50.

このため、曲がり梁部５０では、その断面が円形であるので、曲がり梁部５０のいずれの位置にチェーンが位置しても、そのチェーンが自在に回動することができる。したがって、チェーンのもつれを防ぐことができる。 For this reason, since the curved beam portion 50 has a circular cross section, no matter where the chain is located in the curved beam portion 50, the chain can freely rotate. Therefore, the entanglement of the chain can be prevented.

また、弧状張出部４０の存在によって曲がり梁部５０の延伸長さ（スパン）を短くすることができる。このため、曲がり梁部５０の断面を、いずれの部位でも円形とし、現状の結合金具１０Ｃと比べて溝形腕部３０側での曲がり梁部５０の断面積を減少させつつも、曲がり梁部５０の強度を十分に確保することができる。それにより、曲がり梁部５０の強度を向上させるための処理を削減可能となる。 Further, the presence of the arcuate overhanging portion 40 can shorten the extension length (span) of the curved beam portion 50. For this reason, the cross section of the curved beam portion 50 is circular at any part, and the curved beam portion is reduced while reducing the cross-sectional area of the curved beam portion 50 on the grooved arm portion 30 side as compared with the current coupling fitting 10C. The strength of 50 can be sufficiently secured. This makes it possible to reduce the processing for improving the strength of the curved beam portion 50.

また、本実施の形態では、弧状張出部４０の内周部分は、曲がり梁部５０と連なる円弧状の軌跡の一部を構成している。このため、囲繞孔Ｓ１を一定の直径に維持することができ、直径の大きな丸棒を通したり、チェーンよりも大径な部位を有するフックの吊り輪部分等を掛けることが可能となる。また、弧状張出部４０の内周部分では、応力集中が生じるのを防止可能となる。 Further, in the present embodiment, the inner peripheral portion of the arcuate overhanging portion 40 constitutes a part of an arcuate locus continuous with the curved beam portion 50. Therefore, the surrounding hole S1 can be maintained at a constant diameter, and it becomes possible to pass a round bar having a large diameter or to hang a hanging ring portion of a hook having a portion having a larger diameter than the chain. In addition, it is possible to prevent stress concentration from occurring in the inner peripheral portion of the arcuate overhanging portion 40.

さらに、本実施の形態では、弧状張出部４０の厚み方向（Ｚ方向）の両端側に位置する表面および裏面は、溝形腕部３０の厚み方向（Ｚ方向）の両端側に位置する表面および裏面と面一に設けられている。このため、溝形腕部３０と弧状張出部４０の間で、段差が形成されるのを防ぐことができ、段差の存在を起因とする傷や損傷を防ぐことが可能となる。 Further, in the present embodiment, the front surface and the back surface located on both ends in the thickness direction (Z direction) of arcuate overhanging portion 40 are the surfaces located on both ends in the thickness direction (Z direction) of groove-shaped arm portion 30. And provided flush with the back surface. Therefore, it is possible to prevent a step from being formed between the groove-shaped arm portion 30 and the arcuate overhanging portion 40, and it is possible to prevent scratches and damages due to the presence of the step.

また、本実施の形態では、連結具１１は、２つの結合金具１０のうちの一方の結合金具１０の挿込腕部２０の貫通孔２１と、他方の結合金具１０の溝形腕部３０の挿通孔３３ａ，３３ｂとが位置合わせされ、さらに２つの結合金具１０のうちの一方の結合金具１０の溝形腕部３０の挿通孔３３ａ，３３ｂと、他方の結合金具１０の挿込腕部２０の貫通孔２１とが位置合わせされる。そして、その位置合わせ状態で、連結ピン１００が貫通孔２１および挿通孔３３ａ，３３ｂに挿通されたことで、２つの結合金具１０が連結された構成としている。したがって、本実施の形態の連結具１１を用いることで、２つの結合金具１０のうちの一方を、たとえばチェーンに連結させ、他方をフックや吊り金具等に容易に連結させるように、他の部材との間の連結を容易に実現することができる。 Further, in the present embodiment, the connector 11 includes the through hole 21 of the insertion arm 20 of one of the two fittings 10 and the groove-shaped arm 30 of the other fitting 10. The insertion holes 33a and 33b are aligned with each other, and the insertion holes 33a and 33b of the groove-shaped arm portion 30 of one of the two coupling fittings 10 and the insertion arm portion 20 of the other coupling fitting 10 are further aligned. Are aligned with the through holes 21 of. In the aligned state, the connecting pin 100 is inserted into the through hole 21 and the insertion holes 33a and 33b, so that the two coupling fittings 10 are connected. Therefore, by using the coupling tool 11 of the present embodiment, one of the two coupling fittings 10 is coupled to, for example, a chain, and the other is easily coupled to a hook, a suspension fitting, or the like so that other members can be easily coupled. The connection between and can be easily realized.

＜４．変形例＞
以上、本発明の各実施の形態について説明したが、本発明はこれ以外にも種々変形可能となっている。以下、それについて述べる。 <4. Modification>
Although the respective embodiments of the present invention have been described above, the present invention can be variously modified other than this. This will be described below.

上述の実施の形態においては、弧状張出部４０は、溝形腕部３０側にのみ設けられている。しかしながら、チェーンのリング孔が曲がり梁部５０に位置させることが可能であれば、挿込腕部２０側に弧状張出部を設けるようにしても良い。また、挿込腕部２０に代えて溝形腕部３０に相当する腕部を設ける構成としても良く（すなわち溝形腕部を一対設けても良く）、溝形腕部３０に代えて挿込腕部２０に相当する腕部を設ける構成としても良い（すなわち挿込腕部を一対設けても良い）。 In the above-described embodiment, the arcuate overhanging portion 40 is provided only on the groove-shaped arm portion 30 side. However, if the ring hole of the chain can be located on the curved beam portion 50, the arcuate overhanging portion may be provided on the insertion arm 20 side. Further, instead of the insertion arm portion 20, an arm portion corresponding to the groove-shaped arm portion 30 may be provided (that is, a pair of groove-shaped arm portions may be provided), and the insertion may be performed instead of the groove-shaped arm portion 30. A configuration may be employed in which an arm portion corresponding to the arm portion 20 is provided (that is, a pair of insertion arm portions may be provided).

また、上述の実施の形態では、溝形腕部３０の対向片部３１ａ，３１ｂは、挿込腕部２０よりも厚み方向（Ｚ方向）の寸法が大きくなるように設けられている。しかしながら、対向片部３１ａ，３１ｂの厚み方向（Ｚ方向）の寸法は、挿込腕部２０の厚み方向（Ｚ方向）の寸法と同程度以下であっても良い。 Further, in the above-described embodiment, the facing piece portions 31a and 31b of the groove-shaped arm portion 30 are provided so that the dimension in the thickness direction (Z direction) is larger than that of the insertion arm portion 20. However, the dimension of the facing piece portions 31a and 31b in the thickness direction (Z direction) may be equal to or less than the dimension of the insertion arm portion 20 in the thickness direction (Z direction).

また、上述の実施の形態では、一対の結合金具１０を連結することで、連結具１１が構成されている。しかしながら、連結具は、結合金具１０と、他の結合金具とを組み合わせる構成としても良い。 Further, in the above-described embodiment, the coupling tool 11 is configured by coupling the pair of coupling fittings 10. However, the coupling tool may be configured to combine the coupling fitting 10 and another coupling fitting.

１０，１０Ｃ…結合金具、１１…連結具、２０，２０Ｃ…挿込腕部、２１…貫通孔、２２，２３…円弧面、２４…傾斜部、３０，３０Ｃ…溝形腕部、３１ａ，３１ｂ…対向片部、３２…溝部、３３ａ，３３ｂ…挿通孔、３４…円弧面、４０…弧状張出部、４０ａ…端部、５０，５０Ｃ…曲がり梁部、５１，５１Ｃ…最大応力集中部、５２，５２Ｃ…第２応力集中部、１００…連結ピン、１１０…バネカラー、Ｌ１…中心線、Ｓ１…囲繞孔
10, 10C... Coupling metal fitting, 11... Coupling tool, 20, 20C... Inserting arm part, 21... Through hole, 22, 23... Arc surface, 24... Inclined part, 30, 30C... Groove-shaped arm part, 31a, 31b ... Opposing piece portion, 32... Groove portion, 33a, 33b... Insertion hole, 34... Arc surface, 40... Arc overhang portion, 40a... End portion, 50, 50C... Curved beam portion, 51, 51C... Maximum stress concentration portion, 52, 52C... 2nd stress concentration part, 100... Connection pin, 110... Spring collar, L1... Center line, S1... Surrounding hole

Claims (4)

他の結合金具と連結ピンを介して連結されることにより連結具を構成する結合金具であって、
前記連結ピンが挿入される貫通孔を備える挿込腕部と、
前記連結ピンが挿入される挿通孔を備えると共に、一端側に位置する前記挿込腕部と幅方向において対向する他端側に位置する溝形腕部と、
前記挿込腕部と前記溝形腕部の間に設けられる曲がり梁部と、
を備え、
前記曲がり梁部は、その延伸方向の全体に亘り、該延伸方向と直交する断面が円形に設けられていて、
前記曲がり梁部と前記溝形腕部の間には、前記曲がり梁部の延伸長さを低減する弧状張出部が設けられていて、
前記弧状張出部の横断面において前記幅方向に直交する厚み方向の厚み寸法は、その全体が前記曲がり梁部の断面の直径の２〜２．５倍に設けられていて、
前記曲がり梁部と前記弧状張出部とで囲まれた囲繞孔の中心を通りかつ前記弧状張出部のうち前記溝形腕部とは反対側の端部に差し掛かる線と、前記囲繞孔の中心を通りつつ前記溝形腕部が延伸する方向に平行な中心線との間の角度は、４５度〜６０度の範囲内である、
ことを特徴とする結合金具。 A coupling fitting that constitutes a coupling tool by being coupled to another coupling fitting via a coupling pin,
An inserting arm portion having a through hole into which the connecting pin is inserted,
While having an insertion hole into which the connecting pin is inserted, a groove-shaped arm portion located on the other end side facing the insertion arm portion located on one end side in the width direction,
A curved beam portion provided between the insertion arm portion and the groove-shaped arm portion,
Equipped with
The curved beam portion is provided with a circular cross section orthogonal to the extending direction over the entire extending direction thereof,
Between the curved beam portion and the groove-shaped arm portion, an arc-shaped overhanging portion that reduces the extension length of the curved beam portion is provided,
The thickness dimension in the thickness direction orthogonal to the width direction in the transverse cross section of the arc-shaped overhanging portion is 2 to 2.5 times the diameter of the cross section of the curved beam portion as a whole ,
A line that passes through the center of the surrounding hole surrounded by the curved beam portion and the arc-shaped overhanging portion and reaches an end of the arc-shaped overhanging portion opposite to the groove-shaped arm portion, and the surrounding hole. The angle between the center line parallel to the direction in which the groove-shaped arm extends while passing through the center of is in the range of 45 degrees to 60 degrees,
A coupling fitting characterized by that. 請求項１記載の結合金具であって、
前記弧状張出部の内周部分は、前記曲がり梁部と連なる円弧状の軌跡の一部を構成している、
ことを特徴とする結合金具。 The coupling fitting according to claim 1,
The inner peripheral portion of the arc-shaped overhang portion constitutes a part of an arc-shaped locus continuous with the curved beam portion,
A coupling fitting characterized by that. 請求項１または２記載の結合金具であって、
前記弧状張出部の前記厚み方向の両端側に位置する表面および裏面は、前記溝形腕部の前記厚み方向の両端側に位置する表面および裏面と面一に設けられている、
ことを特徴とする結合金具。 The coupling fitting according to claim 1 or 2, wherein
The front surface and the back surface located on both end sides in the thickness direction of the arc-shaped overhang portion are provided flush with the front surface and the back surface located on both end sides in the thickness direction of the groove-shaped arm portion,
A coupling fitting characterized by that. チェーンを連結対象として連結するために、請求項１から３のいずれか１項に記載の結合金具を２つ連結して環状として使用される連結具であって、
２つの前記結合金具のうちの一方の前記結合金具の前記挿込腕部の前記貫通孔と、２つの前記結合金具の他方の前記結合金具の前記溝形腕部の前記挿通孔とが位置合わせされ、
２つの前記結合金具のうちの一方の前記結合金具の前記溝形腕部の前記挿通孔と、２つの前記結合金具のうちの他方の前記結合金具の前記挿込腕部の貫通孔とが位置合わせされ、
その位置合わせ状態で、前記連結ピンが前記貫通孔および前記挿通孔に挿通されたことで、２つの前記結合金具が連結された、
ことを特徴とする連結具。

A connecting tool used as an annular shape by connecting two connecting fittings according to any one of claims 1 to 3 for connecting a chain as an object to be connected,
The through hole of the insertion arm portion of one of the two coupling fittings and the insertion hole of the grooved arm portion of the other coupling fitting of the two coupling fittings are aligned with each other. Is
The insertion hole of the grooved arm portion of one of the two coupling fittings and the through hole of the insertion arm portion of the other coupling fitting of the two coupling fittings are positioned. Aligned,
In the aligned state, the connecting pin is inserted into the through hole and the insertion hole, whereby the two coupling fittings are connected to each other,
A connector characterized in that.

JP2017053244A 2017-03-17 2017-03-17 Couplings and connectors Active JP6735699B2 (en)

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