JP6799437B2 - Insulated hook - Google Patents
Insulated hook Download PDFInfo
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- JP6799437B2 JP6799437B2 JP2016213387A JP2016213387A JP6799437B2 JP 6799437 B2 JP6799437 B2 JP 6799437B2 JP 2016213387 A JP2016213387 A JP 2016213387A JP 2016213387 A JP2016213387 A JP 2016213387A JP 6799437 B2 JP6799437 B2 JP 6799437B2
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- insulating
- hook
- washer
- insulating sleeve
- sleeve
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- 239000011810 insulating material Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 description 22
- 230000015556 catabolic process Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 6
- 229920001778 nylon Polymers 0.000 description 6
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Load-Engaging Elements For Cranes (AREA)
Description
本発明は、ワークを吊り上げる際にクレーンフックと吊り具との間に連結してこれらを絶縁するために使用される絶縁フックに関する。 The present invention relates to an insulating hook used to insulate a work by connecting it between a crane hook and a hanging tool when lifting the work.
鋼板などのワークＷを吊り上げるために用いられる吊りクランプ１などの吊り具は、一般に、クレーンフック２に直接懸架するか、あるいは、マスターリング３やスリング材４などの連結材を介してクレーンフック２に連結して使用される（図６）が、これらはいずれも金属製であることから、吊り具に把持したワークに溶接作業を行うと、溶接電流のアース不良による感電事故や、クレーンモーターの焼損、スパークによるワイヤーの素線切れなどを起こすことがある。これを未然に防止するために、クレーンフックと吊り具との間に絶縁フックを連結してこれらの間を絶縁することが行われている。特許文献１記載の従来技術では、巻上フックとトラニオンブロックの相互に回動係合する対向箇所に、硬質ナイロン樹脂または同等材料で作られた絶縁筒体（スリーブ）を介装することにより、これらの間を絶縁している。 A hanging tool such as a hanging clamp 1 used for lifting a work W such as a steel plate is generally suspended directly on a crane hook 2 or a crane hook 2 via a connecting material such as a master ring 3 or a sling material 4. (Fig. 6), all of which are made of metal, so if welding work is performed on the work gripped by the hanger, an electric shock accident due to poor grounding of the welding current or a crane motor It may burn out or break the wire due to sparks. In order to prevent this from happening, an insulating hook is connected between the crane hook and the hanger to insulate between them. In the prior art described in Patent Document 1, an insulating cylinder (sleeve) made of hard nylon resin or an equivalent material is interposed at a facing portion where the hoisting hook and the trunnion block are rotationally engaged with each other. Insulate between them.
しかしながら、詳しく後述するように、フック上端の雄ネジ部が挿通する箇所を絶縁しただけでは不十分であり、フック上端に螺着されるナットについても絶縁手段を採用し、且つ、絶縁破壊時に電気が通るルートを考慮した上でスリーブ形状を設計する必要がある。 However, as will be described in detail later, it is not enough to insulate the part where the male screw part at the upper end of the hook is inserted, and the nut screwed to the upper end of the hook also adopts an insulating means and is electrically charged when the insulation breaks down. It is necessary to design the sleeve shape in consideration of the route through which.
したがって、本発明が解決しようとする課題は、上記を考慮した上で、絶縁性能を格段に向上させた絶縁フックを提供することである。 Therefore, the problem to be solved by the present invention is to provide an insulating hook having significantly improved insulation performance in consideration of the above.
この課題を達成するため、請求項１に係る本発明は、ワークを吊り上げる吊り具を直接または連結材を介して係止するフックと、クレーンフックに直接または連結材を介して係止される吊環と、フックの上端に延長する軸部を吊環の下端に設けられる回転体の挿通穴に挿通させた状態で挿通穴の上方でフック軸部先端の雄ネジ部にナットが螺着されることによりフックと吊環とを相対回転自在に連結する連結手段とを有してなり、挿通穴に絶縁材料からなる絶縁スリーブが嵌着され、絶縁スリーブの上端外面側を部分的に切り欠いて形成した上端段部に絶縁材料からなる第一絶縁ワッシャーが嵌着されてその上面が絶縁スリーブの上端と略面一に設けられると共に、絶縁スリーブの下端外面側を部分的に切り欠いて形成した下端段部に絶縁材料からなる第二絶縁ワッシャーが嵌着されてその下面が絶縁スリーブの下端と略面一に設けられることを特徴とする絶縁フックである。ワークを吊り上げる吊り具を直接または連結材を介して係止するフックと、クレーンフックに直接または連結材を介して係止される吊環と、フックの上端に延長する軸部を吊環の下端に設けられる回転体の挿通穴に挿通させた状態で挿通穴の上方でフック軸部先端の雄ネジ部にナットが螺着されることによりフックと吊環とを相対回転自在に連結する連結手段とを有してなり、挿通穴に絶縁材料からなる絶縁スリーブが嵌着され、絶縁スリーブの上端外面側を部分的に切り欠いて形成した上端段部に絶縁材料からなる第一絶縁ワッシャーが嵌着されてその上面が絶縁スリーブの上端と略面一に設けられると共に、絶縁スリーブの下端外面側を部分的に切り欠いて形成した下端段部に絶縁材料からなる第二絶縁ワッシャーが嵌着されてその下面が絶縁スリーブの下端と略面一に設けられることを特徴とする絶縁フック。
In order to achieve this object, the present invention according to claim 1 has a hook that locks a hanger for lifting a work directly or via a connecting member, and a hanging ring that is locked to a crane hook directly or via a connecting member. And, with the shaft part extending to the upper end of the hook inserted into the insertion hole of the rotating body provided at the lower end of the suspension ring, the nut is screwed to the male screw part at the tip of the hook shaft part above the insertion hole. It has a connecting means for connecting the hook and the suspension ring so as to be relatively rotatable, and an insulating sleeve made of an insulating material is fitted in the insertion hole, and the upper end formed by partially cutting out the outer surface side of the upper end of the insulating sleeve. A first insulating washer made of an insulating material is fitted to the step portion, the upper surface thereof is provided substantially flush with the upper end of the insulating sleeve, and the lower end step portion formed by partially cutting out the outer surface side of the lower end of the insulating sleeve. It is an insulating hook characterized in that a second insulating washer made of an insulating material is fitted therein, and the lower surface thereof is provided substantially flush with the lower end of the insulating sleeve . A hook that locks the hanger that lifts the work directly or via a connecting material, a hanging ring that is locked directly to the crane hook or via a connecting material, and a shaft portion that extends to the upper end of the hook are provided at the lower end of the hanging ring. There is a connecting means that connects the hook and the suspension ring so that they can rotate relative to each other by screwing a nut into the male threaded part at the tip of the hook shaft above the insertion hole while being inserted into the insertion hole of the rotating body. Then, an insulating sleeve made of an insulating material is fitted into the insertion hole, and a first insulating washer made of an insulating material is fitted to an upper end step formed by partially cutting out the outer surface side of the upper end of the insulating sleeve. The upper surface is provided substantially flush with the upper end of the insulating sleeve, and a second insulating washer made of an insulating material is fitted to the lower end step portion formed by partially cutting out the outer surface side of the lower end of the insulating sleeve. An insulating hook characterized in that is provided substantially flush with the lower end of the insulating sleeve .
本発明によれば、絶縁スリーブによりフックの軸部と吊環下端の回転体との間が絶縁されるだけでなく、フック軸部上端に螺着されるナット（またはその下に配置される通常の金属製ワッシャー）と回転体との間が第一絶縁ワッシャーで絶縁され、さらに、フック軸部自体（またはこれに配置される通常の金属製ワッシャー）と回転体との間が第二絶縁ワッシャーで絶縁されるので、フックと吊環とが直接または間接に接触することがなく、絶縁性能が良好である。 According to the present invention, the insulating sleeve not only insulates between the shaft portion of the hook and the rotating body at the lower end of the suspension ring, but also a nut screwed to the upper end of the hook shaft portion (or is usually arranged under the nut). A first insulating washer insulates between the metal washer) and the rotating body, and a second insulating washer between the hook shaft itself (or a normal metal washer placed on the washer) and the rotating body. Since it is insulated, the hook and the suspension ring do not come into direct or indirect contact, and the insulation performance is good.
さらに、第一絶縁ワッシャーおよび第二絶縁ワッシャーは、それぞれ、絶縁スリーブの上端および下端の外面側を部分的に切り欠いて形成された上端段部および下端段部に設けられるので、後述するように、絶縁破壊時に電気が絶縁ワッシャーとスリーブとの隙間ではなく、絶縁ワッシャーの沿面を通ることになる。これにより、絶縁破壊電圧が約２倍となり、絶縁性能を大きく向上することができる。 Further, the first insulating washer and the second insulating washer are provided on the upper end step portion and the lower end step portion formed by partially cutting out the outer surface side of the upper end and the lower end of the insulating sleeve, respectively, and will be described later. At the time of dielectric breakdown, electricity passes along the surface of the insulating washer, not the gap between the insulating washer and the sleeve. As a result, the dielectric breakdown voltage is doubled, and the insulation performance can be greatly improved.
図１および図２を参照して、本発明の一実施例による絶縁フック１０について説明する。この絶縁フック１０は、一例として図５に示すように、従来技術として示した図６の用例において、クレーンフック２と、クランプ１にスリング材４を介して連結されるマスターリンク３との間に連結して使用されるものであり、マスターリンク３を係止するフック１１と、クレーンフック２に係止される吊環１２とを有する。フック１１の上端に延長する軸部１１１は、吊環１２の下端に設けられる回転体１２１の挿通穴１２２（図３）を挿通し、その上方で、フック軸部先端の雄ネジ部（符号なし）にナット１３が螺着されることにより、フック１１と吊環１２とが相対回転自在に連結されている。符号１９は、フック１１に係止したマスターリンク３やスリング材４が不慮に外れることを防止するための重力式外れ止めであるが、本発明の手段に直接関連しないので、詳細説明を割愛する。 The insulating hook 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 5 as an example, the insulating hook 10 is provided between the crane hook 2 and the master link 3 connected to the clamp 1 via the sling material 4 in the example of FIG. 6 shown as the prior art. It is used in connection with each other, and has a hook 11 for locking the master link 3 and a hanging ring 12 for locking the crane hook 2. The shaft portion 111 extending to the upper end of the hook 11 is inserted through the insertion hole 122 (FIG. 3) of the rotating body 121 provided at the lower end of the hanging ring 12, and above that, the male screw portion (unsigned) at the tip of the hook shaft portion. By screwing the nut 13 into the hook 11, the hook 11 and the ring 12 are connected so as to be relatively rotatable. Reference numeral 19 is a gravity-type stopper for preventing the master link 3 and the sling material 4 locked to the hook 11 from being accidentally disengaged. However, since it is not directly related to the means of the present invention, detailed description thereof will be omitted. ..
この連結構成についてさらに図３（ａ）を参照して詳しく説明する。回転体１２１の挿通穴１２２には、絶縁材料からなる絶縁スリーブ１４が嵌着され、絶縁スリーブ１４の上端１４１の外面１４２側を部分的に切り欠いて形成した上端段部１４３に、絶縁スリーブ１４の上端１４１と略面一に、絶縁材料からなる第一絶縁ワッシャー１５が設けられると共に、絶縁スリーブ１４の下端１４４の外面１４２側を部分的に切り欠いて形成した下端段部１４５に、絶縁スリーブ１４の下端１４４と略面一に、絶縁材料からなる第二絶縁ワッシャー１６が設けられる。第一絶縁ワッシャー１５の下面は回転体１２１の上面に接し、第二絶縁ワッシャー１６の上面は回転体１２１の下面に接している。絶縁スリーブ１４、第一絶縁ワッシャー１５および第二絶縁ワッシャー１６は、ポリエステル、架橋ポリエチレン、エポキシ、塩化ビニルなどの公知の絶縁材料の中から適宜選択した絶縁材料により所定形状に成形されたものであり、特に、ＭＣナイロン、ＰＥＴ−Ｐ、ＰＯＭ−ＮＨなどの絶縁性と共に機械的強度、耐摩擦性、すべり特性、耐候性などに優れたエンジニアリングプラスチック材料で形成することが好ましい。 This connection configuration will be further described in detail with reference to FIG. 3A. An insulating sleeve 14 made of an insulating material is fitted into the insertion hole 122 of the rotating body 121, and the insulating sleeve 14 is formed in an upper end step portion 143 formed by partially cutting out the outer surface 142 side of the upper end 141 of the insulating sleeve 14. A first insulating washer 15 made of an insulating material is provided substantially flush with the upper end 141 of the above, and an insulating sleeve is formed on a lower end step portion 145 formed by partially cutting out the outer surface 142 side of the lower end 144 of the insulating sleeve 14. A second insulating washer 16 made of an insulating material is provided substantially flush with the lower end 144 of 14. The lower surface of the first insulating washer 15 is in contact with the upper surface of the rotating body 121, and the upper surface of the second insulating washer 16 is in contact with the lower surface of the rotating body 121. The insulating sleeve 14, the first insulating washer 15, and the second insulating washer 16 are formed into a predetermined shape by an insulating material appropriately selected from known insulating materials such as polyester, cross-linked polyethylene, epoxy, and vinyl chloride. In particular, it is preferably formed of an engineering plastic material having excellent mechanical strength, abrasion resistance, slip property, weather resistance, etc. as well as insulating properties such as MC nylon, PET-P, and POM-NH.
図示実施例では、第一絶縁ワッシャー１５は、ナット１３の下方に配置したワッシャー１７（通常の金属製のもの）の下方に接して設けられ、第二絶縁ワッシャーは、フック１１に嵌着したワッシャー１８（通常の金属製のもの）の上方に接して設けられている。 In the illustrated embodiment, the first insulating washer 15 is provided in contact with the lower part of the washer 17 (ordinary metal one) arranged below the nut 13, and the second insulating washer is a washer fitted to the hook 11. It is provided in contact with the upper part of 18 (ordinary metal one).
以上のように構成された絶縁フック１０は、絶縁スリーブ１４によりフック１１の軸部１１１と吊環１２下端の回転体１２１との間が絶縁されるだけでなく、フック軸部１１１の上端に螺着されるナット１３またはその下に配置される通常の金属製ワッシャー１７と回転体１２１との間が第一絶縁ワッシャーで１５絶縁され、さらに、フック軸部１１１自体またはこれに配置される通常の金属製ワッシャー１８と回転体１２１との間が第二絶縁ワッシャー１６で絶縁されるので、フック１１と吊環１２とが直接または間接に接触することがなく、絶縁性能が良好になる。 In the insulating hook 10 configured as described above, not only the shaft portion 111 of the hook 11 and the rotating body 121 at the lower end of the suspension ring 12 are insulated by the insulating sleeve 14, but also the insulating hook 10 is screwed to the upper end of the hook shaft portion 111. 15 insulation is provided between the normal metal washer 17 arranged under the nut 13 or the rotating body 121 and the rotating body 121, and the hook shaft portion 111 itself or the normal metal arranged therein is further insulated by the first insulating washer. Since the washer 18 and the rotating body 121 are insulated by the second insulating washer 16, the hook 11 and the suspension ring 12 do not come into direct or indirect contact with each other, and the insulating performance is improved.
このことに加えて、この絶縁フック１０によれば、第一絶縁ワッシャー１５および第二絶縁ワッシャー１６は、それぞれ、絶縁スリーブ１４の上端１４１および下端１４４の外面１４２側を部分的に切り欠いて形成した上端段部１４３および下端段部１４５に設けられるので、これら段部１４３，１４５を形成しない場合と比べて絶縁破壊電圧が約２倍となり、絶縁性能を大きく向上することができる。 In addition to this, according to the insulating hook 10, the first insulating washer 15 and the second insulating washer 16 are formed by partially cutting out the outer surface 142 side of the upper end 141 and the lower end 144 of the insulating sleeve 14, respectively. Since the upper end step portion 143 and the lower end step portion 145 are provided, the insulation breakdown voltage is about twice as much as the case where these step portions 143 and 145 are not formed, and the insulation performance can be greatly improved.
すなわち、最大使用荷重１トン、２トン、３トンおよび５トンの４つの機種について、本発明実施例１〜３による段付き絶縁スリーブ構造２０（図３（ａ））と、比較例による段なし絶縁スリーブ構造２０’（図３（ｂ））の絶縁破壊電圧を測定したところ、表１に示す結果を得た。本発明実施例１は、ＭＣナイロン製の絶縁スリーブ１４に上端段部１４３および下端段部１４５を形成してこれら段部１４３，１４５にそれぞれ同じくＭＣナイロン製の第一および第二ワッシャー１５，１６を設けたものであり、比較例は段部１４３，１４５のないＭＣナイロン製絶縁スリーブを用いた以外は同様の構成にしたものである。また、絶縁スリーブ１４、第一絶縁ワッシャー１５および第二絶縁ワッシャー１６の材質をＰＥＴ‐ＰおよびＰＯＭ−ＮＨに変えた段付き絶縁スリーブ構造２０（本発明実施例２，３）についても、同様に絶縁破壊電圧を測定したので、併せて表１に示した。また、表１に示す結果をグラフにして図４に示した。 That is, for four models having a maximum working load of 1 ton, 2 tons, 3 tons, and 5 tons, the stepped insulation sleeve structure 20 according to Examples 1 to 3 of the present invention (FIG. 3A) and the stepless structure according to the comparative example. When the dielectric breakdown voltage of the insulating sleeve structure 20'(FIG. 3 (b)) was measured, the results shown in Table 1 were obtained. In Example 1 of the present invention, the upper end step portion 143 and the lower end step portion 145 are formed on the insulating sleeve 14 made of MC nylon, and the first and second washers 15 and 16 also made of MC nylon are formed on these step portions 143 and 145, respectively. The comparative example has the same configuration except that an insulating sleeve made of MC nylon without step portions 143 and 145 is used. The same applies to the stepped insulating sleeve structure 20 (Examples 2 and 3 of the present invention) in which the materials of the insulating sleeve 14, the first insulating washer 15, and the second insulating washer 16 are changed to PET-P and POM-NH. Since the dielectric breakdown voltage was measured, it is also shown in Table 1. The results shown in Table 1 are shown in a graph in FIG.
表１および図４から明らかなように、同じ絶縁材料（ＭＣナイロン）を用いた場合（実施例１、比較例）であっても、段付き絶縁スリーブ構造とした本発明実施例１によれば、絶縁破壊電圧が大幅に上昇しており、絶縁抵抗性能が格段に向上したことが実証された。また、絶縁材料を変えた本発明の実施例２，３においても、優れた絶縁抵抗性能を発揮するものであることが実証された。 As is clear from Table 1 and FIG. 4, even when the same insulating material (MC nylon) is used (Example 1, Comparative Example), according to the first embodiment of the present invention having a stepped insulating sleeve structure. , The dielectric breakdown voltage has risen significantly, demonstrating that the insulation resistance performance has improved dramatically. Further, it was demonstrated that even in Examples 2 and 3 of the present invention in which the insulating material was changed, excellent insulation resistance performance was exhibited.
段なし絶縁スリーブ構造２０’とした比較例の絶縁フックより段付き絶縁スリーブ構造２０とした本発明の絶縁フック１０の方が絶縁抵抗性能に優れることの理由は、図３に示すところから明らかである。すなわち、前者ではスリーブ外面１４２とワッシャー１５，１６の内面との間のわずかな隙間を通って直線的に電気が通るのに対し、後者ではワッシャー１５，１６の内面がスリーブ１４の上端段部１４３，下端段部１４５にそれぞれ入り込むことにより隙間が埋まるため、ワッシャー１５，１６の沿面１５１，１６１を通ることになり、その通電距離が長くなることによって絶縁抵抗性能が向上するものと考えられる。 The reason why the insulating hook 10 of the present invention having the stepped insulating sleeve structure 20 is superior in the insulating resistance performance to the insulating hook of the comparative example having the stepless insulating sleeve structure 20'is clear from the view shown in FIG. is there. That is, in the former, electricity passes linearly through a slight gap between the outer surface 142 of the sleeve and the inner surfaces of the washers 15 and 16, whereas in the latter, the inner surface of the washers 15 and 16 is the upper end step 143 of the sleeve 14. , Since the gap is filled by entering the lower end step portion 145, the washer 15 and 16 pass along the creeping surfaces 151 and 161, and it is considered that the insulation resistance performance is improved by increasing the energization distance.
また、絶縁破壊時の破壊箇所は、比較例がスリーブ１４と絶縁ワッシャーとの間の隙間に通電したためこの通電箇所が溶けて隙間に小さい孔が開いたのに対し、本発明実施例ではいずれも絶縁ワッシャー１５，１６の沿面１５１，１６１を通電しただけで損傷を受けずに済み、絶縁破壊後の再使用にも問題がなかったことを確認した。 Further, as for the breakdown points at the time of dielectric breakdown, in the comparative example, since the gap between the sleeve 14 and the insulation washer was energized, the energized portion melted and a small hole was opened in the gap. It was confirmed that the creeping surfaces 151 and 161 of the insulating washers 15 and 16 were not damaged by just energizing them, and there was no problem in reusing after the dielectric breakdown.
以上に本発明について実施例を挙げて詳述したが、本発明はこれらに限定されることなく、特許請求の範囲に記載された発明の範囲内において様々な変形や変更を施して実施可能である。 Although the present invention has been described in detail with reference to examples, the present invention is not limited to these, and can be implemented with various modifications and modifications within the scope of the invention described in the claims. is there.
Ｗ ワーク
１ クランプ
２ クレーンフック
３ マスターリンク
４ スリング材
１０ 絶縁フック
１１ フック
１１１ 軸部
１２ 吊環
１２１ 回転体
１３ ナット
１４ 絶縁スリーブ
１４１ 上面
１４２ 外面
１４３ 上端段部
１４４ 下面
１４５ 下端段部
１５ 第一絶縁ワッシャー
１５１ 沿面
１６ 第二絶縁ワッシャー
１６１ 沿面
１７ ワッシャー
１８ ワッシャー
１９ 外れ止め
W Work 1 Crane 2 Crane Hook 3 Master Link 4 Sling Material 10 Insulation Hook 11 Hook 111 Shaft 12 Suspension Ring 121 Rotating Body 13 Nut 14 Insulation Sleeve 141 Top Top 142 Outer Surface 143 Top Step 144 Bottom Bottom 145 Bottom Step 15 First Insulation Washer 151 Crane 16 Second insulation washer 161 Crane 17 Washer 18 Washer 19 Retaining
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| JP6799437B2 true JP6799437B2 (en) | 2020-12-16 |
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