JP3858095B2

JP3858095B2 - Horizontal suspension clamp

Info

Publication number: JP3858095B2
Application number: JP2003172368A
Authority: JP
Inventors: 聡玉手
Original assignee: NATIONAL INSTITUTE OF OCCUPATIONAL SAFETY AND HEALTH, JAPAN
Current assignee: NATIONAL INSTITUTE OF OCCUPATIONAL SAFETY AND HEALTH, JAPAN
Priority date: 2003-06-17
Filing date: 2003-06-17
Publication date: 2006-12-13
Anticipated expiration: 2023-06-17
Also published as: JP2005008316A

Description

【０００１】
【発明の属する技術分野】
本発明は移動式クレーンや固定式クレーンにおけるつり上げワイヤーの先端に取付けＨ型鋼等の鋼材をつり下げ移動させるクランプであって、前記ワイヤーを巻き上げた際に鋼材を不用意にくわえ込むことがないようにした横つりクランプに関する。
【０００２】
【従来の技術】
従来における建築工事現場や土木工事現場において、Ｈ型鋼材等の鋼材をつり下げて移動するための横つりクランプとしては、図７に示すクランプが有り、以下この図について説明する。
【０００３】
１はクランプ本体にして、開口部１１を有する略Ｕ字状に形成されている。２は前記本体１の開口部１１に近接した位置においてカムピン１２によって回転自在に軸支されたカムにして、開口部１１内に臨む一端には開口部１１を構成する鋼材受け面部１１ａとの間でＨ型鋼等の鋼材Ａを挟持するための係合歯２１が形成され、また、カム２の他端には、例えば移動式クレーンＢからのワイヤーＢ１の先端が取付けられる取付環部２２が形成されている。
【０００４】
このような構成の横つりクランプにあって鋼材Ａを移動させるには、鋼材Ａの周縁に本体１の開口部１１を差し込んでワイヤーＢ１を引き上げると、カム２は図２において時計方向に回転されるので、係合歯２１が受け面部１１ａとの間で鋼材Ａを挟持する。この結果、ワイヤーＢ１を引き上げてクレーンのジブＢ２を起伏および伸縮すること、並びに、上部旋回体Ｂ３を旋回することで、所望の位置に移動させることができる。
【０００５】
【非特許文献】
発行者「社団法人日本クレーン協会」
発行日「２００３年１月１日」
雑誌名「クレーン」
引用部分第７頁右欄「４．種類」における横つりクランプの図面
【０００６】
【発明が解決しようとする課題】
ところで、前記した従来の横つりクランプにあっては、図８に示すように鋼材の移動が終了した状態では、クランプの本体は地面に放置されたままとなるので、次の作業を行うためにワイヤーを巻き上げると本体は地面上を移動した後に上昇することとなるが、前記地面上を移動する途中で本体の開口部に鋼材が噛み混んで引っ掛かった状態となって移動する場合がある。この結果、つり上げ途中で鋼材が本体から外れて落下し、近傍で作業している作業者に当たって大きな事故に発生するといった問題があった。
【０００７】
本発明は前記した問題点を解決せんとするもので、その目的とするところは、本体が地面上を移動している間はつり環によって本体の開口部が塞がれているので、鋼材を不用意に引っ掛かけることがなくつり上げ途中で鋼材が落下することがないので、鋼材の落下による事故を防止できる横つりクランプを提供せんとするにある。
【０００８】
【課題を解決するための手段】
本発明の横つりクランプは前記した目的を達成せんとするもので、その請求項１の手段は、Ｕ字状に形成された本体と、該本体に軸支されたカムと、該カムに軸部材を介して軸支され先端にワイヤーが取付けられた閉塞部材と、前記カムに対して閉塞部材が前記本体の開口部を塞ぐ方向にバネ付勢するためのバネとより構成し、本体がワイヤーによって地面上を引きずられた状態においては、本体の開口部が前記閉塞部材によって塞がれ、ワイヤーによる引き上げ状態においては、前記閉塞部材による開口部の閉塞状態が解除されることを特徴とする。
【００１１】
請求項２の手段は、Ｕ字状に形成された本体と、該本体に軸支されたカムと、該カムに軸部材を介して軸支され先端にワイヤーが取付けられた閉塞部材とより構成し、前記カムに対して前記閉塞部材を回転可能に軸支する軸部材を２つの軸に分割すると共に、対向面どうしが圧接されるようにバネ付勢し、かつ、前記対向面に段部を形成し、本体をワイヤーによって地面上を引きずられた場合には、前記段部どうしを係合して本体の開口部を前記閉塞部材によって塞ぎ、ワイヤーによって本体を引き上げる場合には、前記段部どうしの係合を解除することで前記閉塞部材による開口部が開放されるようにしたことを特徴とする。
【００１２】
請求項３の手段は、Ｕ字状に形成された本体と、該本体に軸支されたカムと、該カムに軸部材を介して軸支され先端にワイヤーが取付けられた閉塞部材とより構成し、前記軸部材は前記カムに固定された固定軸であり、かつ、キーが形成され、また、前記固定軸に回転可能に軸支される閉塞部材の軸孔には前記キーに係合可能なキー孔が形成され、さらに、前記固定軸には前記閉塞部材を前記キー側に押圧するスプリングが設けられ、本体をワイヤーによって地面上を引きずられた場合には、前記キーに前記キー孔を係合して本体の開口部を前記閉塞部材によって塞ぎ、ワイヤーによって本体を引き上げる場合には、前記キーと前記キー孔との係合状態を前記スプリングのバネ力に抗して解除することで前記閉塞部材による開口部が開放されるようにしたことを特徴とする。
【００１４】
【発明の実施の形態】
本発明に係る横つりクランプの第１の実施の形態を図１，２と共に説明する。なお、前記した従来例と同一符号は同一部分を示し詳細についての説明は省略する。
本発明の横つりクランプは、本体１の開口部１１に軸支されたカム２における係合歯が形成された端部とは反対側の端部に軸部材３１によって閉塞部材３の一端が軸支され、また、該軸部材３１には図１，２において閉塞部材を反時計方向にバネ付勢するためのバネ（図示せず）が張設されている。なお、閉塞部材３の他端には孔３２が開口されており、該孔３２にワイヤーＢ１が取付けられている。
【００１５】
すなわち、前記バネによって閉塞部材３は、ワイヤーＢ１による引っ張り力（本体１を地面上を引きずられた力であり、本体１を地面から浮かせる力ではない）が作用している状態にあっては、本体１の開口部１１を塞ぐように構成され、また、ワイヤーＢ１による引き上げ力が作用すると、前記バネのバネ力に抗して閉塞部材３は垂直方向に回動して開口部１１を開放するように構成されている。
【００１６】
次に、図２に示す本発明の横つりクランプの動作について説明するに、仮想線で示す状態は本体１が地面上にあり、かつ、ワイヤーＢ１が左方向に引っ張られて本体１が左方向に移動している。この状態においては、閉塞部材３はバネ力によって開口部１１を塞いだ状態を維持するので、Ｈ型鋼材Ａが本体１の移動方向に有っても閉塞部材３によって開口部１１内に入り込むことがなく、従って、鋼材Ａを巻き上げる際にクランプが不用意に鋼材Ａを噛み混んで引っ掛かった状態となっるために、つり上げられた鋼材Ａが落下して作業者に激突する災害を防止できる。
【００１７】
一方、鋼材Ａをクランプによって移動させる動作について説明するに、カム２が図１において時計方向に回転して係合歯２１が開口部１１を塞がないように指などで押さえた状態で、閉塞部材３を時計方向にバネ力に抗して回転させ開口部１１に鋼材Ａを挿入し、次いで、カム２の係合歯２１を鋼材Ａに噛み込ませてワイヤーＢ１を引き上げることにより、鋼材Ａに対して係合歯２１は鋼材Ａを鋼材受け面部１１ａとの間で益々強い力で挟持することとなるので安全につり上げることが可能となる。
【００１８】
なお、前記した実施の形態にあっては、カム２に対して閉塞部材３の回転軸部にバネを設けて閉塞部材３が開口部１１を塞ぐようにしているが、前記バネのバネ力は本体１（一般的に重量が２〜３Ｋｇ）を地面上で引きずった時に開口部１１を開放しない程度のバネ力でよいので、それ程強いバネ力ではないが、前記した鋼材Ａをつり上げるために閉塞部材３を回転させるには前記バネ力に抗して回転させなければならいので少しは力が必要である。
【００１９】
そこで、本体１とカム２との回転軸部にも、閉塞部材３を時計方向に回転させてもカム２の係合歯２１が噛み込む方向とは反対方向にバネ力が作用し、かつ、閉塞部材３を時計方向に回転させても閉塞部材３が時計方向には回転することのない程度のバネをカム２に取付けることで、鋼材Ａをつり上げるために閉塞部材３を回転させる時の力が弱くても鋼材Ａを開口部１１に挿入することが可能となるようにしてもよい。
【００２０】
次に、第２の実施の形態を図３と共に説明する。
図３はカム２に対して閉塞部材３を軸支するための軸部材４であり、該軸部材４はカム２の軸孔側に固定される軸４ａと、閉塞部材３の軸孔側に固定される軸４ｂとから構成され、かつ、２つの軸４ａ，４ｂは両者間に挿通された連結軸４ｃによって互いに分離しないように構成され、また、図示しないバネによって対向面が互いに接触する方向にバネ付勢されている。
【００２１】
さらに、軸４ａ，４ｂの対向面には１８０°分だけ段部４ａ₁，４ｂ₁が形成され、段部４ａ₁，４ｂ₁どうしが噛み合い状態の時には一体的に回転し、前記バネによるバネ力に抗して軸４ａ，４ｂを引き離す方向に移動させて段部４ａ1，４ｂ₁の噛み合い状態を解除させると、軸４ａが固定されている閉塞部材３をカム２に対して回動することが可能となる。
【００２２】
前記した如く構成した軸部材４を利用してカム２と閉塞部材３とを軸支することにより、軸４ａ，４ｂの段部４ａ₁，４ｂ₁が噛み合い状態で閉塞部材３が開口部１１を塞いだ位置とすることで（図３ａ参照）、閉塞部材３をワイヤーＢ１によって地面上を引きずるような方向に引っ張っても、閉塞部材３とカム２との軸支部分が回転することがないので、閉塞部材３は開口部１１を塞いで状態を維持し、従って、本体１の移動中に鋼材Ａが引っ掛かることがない。
【００２３】
一方、鋼材Ａをクランプによって移動させる動作について説明するに、この場合には閉塞部材３をカム２から離す方向にバネ力に抗して移動させると、軸４ａ，４ｂの段部４ａ₁，４ｂ₁の噛み合わせが外れるので、閉塞部材３を回動して開口部１１から退避させる（図３ｂ参照）。この状態において開放された開口部１１内に鋼材Ａを挿入してワイヤーＢ１を引き上げることで、カム２が回動して係合歯２１と鋼材受け面部１１ａとの間で鋼材Ａが挟持され、従って、つり下げ移動させることができる。
【００２４】
次に、第３の実施の形態を図４、図５と共に説明する。
この実施の形態にあっては、カム２の閉塞部材３を軸支するための取付環部２２が二股部２２ａに形成され、該二股部２２ａにはキー２３ａを有する固定軸２３を固定されている。また、前記固定軸２３には閉塞部材３の一端に形成された前記キー２３ａと係合するキー孔３３ａを有する軸支孔３３が回転自在に軸支されている。さらに、前記固定軸２３の前記キー２３ａが形成されている端部とは反対側には、閉塞部材３をキー２３ａ側に向かってバネ力を付勢するスプリング５が配置されている。
【００２５】
そして、前記固定軸２３に形成されているキー２３ａおよびキー孔３３ａは、図４に示すように閉塞部材３によって開口部１１を塞ぐ方向に閉塞部材３を回動した時に、キー２３ａとキー孔３３ａと係合されるような位置に形成され、かつ、この状態においてスプリング５が前記係合状態が外れないようにバネ付勢しているものである。
【００２６】
前記した如く構成した実施の形態にあっては、閉塞部材３によって本体１の開口部１１を閉塞した状態とするためには、閉塞部材３の軸支孔３３のキー孔３３ａをカム２の固定軸２３に形成されたキー２３ａに係合することで閉塞部材３は開口部１１を閉塞状態となり、従って、ワイヤーＢ１によって本体１を引きずって移動させても鋼材Ａが引っ掛かることがない。
【００２７】
一方、鋼材Ａをクランプによって移動させる動作について説明するに、この場合には閉塞部材３をスプリング５のバネ力に抗して移動させてキー２３ａとキー孔３３ａの係合状態を解除することで、閉塞部材３を回動して開口部１１から退避させることができ、かつ、カム２と閉塞部材３とは略直線状態となるので、この状態において開放された開口部１１内に鋼材Ａを挿入してワイヤーＢ１を引き上げることで、カム２が回動して係合歯２１と鋼材受け面部１１ａとの間で鋼材Ａが挟持され、従って、つり上げ移動させることができる。
【００２８】
なお、前記した第２、第３の実施の形態において、本体１に対してカム２を軸支する際に、カム２に反時計方向のバネ力を作用させることにより、前記閉塞部材３をカム２に対し略直角状態（開口部１１を閉塞状態）で地面上を引きずって移動しても、前記バネ力によってカム２が時計方向に回動することがなくなるので、閉塞部材３による開口部１１の閉塞状態が解除されるのを防止できる。
【００２９】
次に、第４の実施の形態を図６と共に説明する。
この実施の形態のものは、公知のクランプの本体１における開口部１１を塞ぐ閉塞部材７を開口部１１を構成する本体１の上部に回動自在に取付けたものである。なお、閉塞部材７の下端は開口部１１を構成する本体１の下部にまで達するような大きさに形成されている。
【００３０】
このように構成したクランプにあっては、常時、閉塞部材６が開口部１１を塞いでいるので、本体１を地面上を引きずって移動させても鋼材Ａが開口部１１に入り込むことがない。一方、鋼材Ａを移動させる場合には、閉塞部材６を手で上方に開放することで鋼材Ａを開口部１１内に挿入することができるので、ワイヤーＢ１を上方に引き上げることで、カム２が回動して係合歯２１と鋼材受け面部１１ａとの間で鋼材Ａが挟持され、つり下げ移動させることができる。
【００３１】
なお、この実施の形態において、閉塞部材６に対して開口部１１を塞ぐ方向へのバネ力を付勢することで、地面上を引きずった際に前記バネ力によって開口部１１を強制的に塞ぐこととなるので、鋼材Ａの開口部１１への挿入を確実に防止することができる。
【００３２】
【発明の効果】
本発明は前記したように、ワイヤーの巻き上げ時に横つりクランプ本体が地面上を引きずられた場合においても、閉塞部材が本体の開口部を塞ぎ、かつ、本体がワイヤーによってつり上げられる力が作用すると前記閉塞部材による開口部の閉塞が解除されるように構成したので、閉塞部材を１つ追加した簡単な構成のクランプであっても、鋼材を不用意に引っ掛かることがなくつり上げ途中で鋼材が落下することがなく、従って、鋼材の落下による事故を防止できるものである。
【００３３】
また、開口部に、常時開口部を閉塞する閉塞部材を回転自在に取付けることで、前記したと同様な効果が得られると共に、構造も非常に簡単でコストの安いクランプを製作できる等の効果を有するものである。
【図面の簡単な説明】
【図１】本発明に係る横つりクランプの第１の実施の形態を示す側面図である。
【図２】同上の動作を示す側面図である。
【図３】第２の実施の形態を示す要部の斜視図であり、（ａ）は結合状態を示し、（ｂ）は結合を解除した状態を示す。
【図４】第３の実施の形態を示す斜視図である。
【図５】同上の正面図である。
【図６】第４の実施の形態を示す斜視図である。
【図７】従来の横つりクランプの側面図である。
【図８】同上のクランプを使用した場合に発生する可能性のある事故を説明するための説明図である。
【符号の説明】
１本体
１１開口部
１１ａ鋼材受け面部
２カム
２１係合歯
２３固定軸
２３ａキー
３，６閉塞部材
３１軸部材
３３軸支孔
３３ａキー孔
４軸部材
４ａ，４ｂ軸
４ａ₁，４ｂ₁ 段部[0001]
BACKGROUND OF THE INVENTION
The present invention is a clamp for attaching and moving a steel material such as an H-shaped steel to the tip of a lifting wire in a mobile crane or a stationary crane so that the steel material is not accidentally caught when the wire is wound up. It relates to the horizontal suspension clamp.
[0002]
[Prior art]
In a conventional construction work site and civil engineering work site, there is a clamp shown in FIG. 7 as a horizontal suspension clamp for moving a steel material such as an H-shaped steel material, which will be described below.
[0003]
Reference numeral 1 denotes a clamp body, which is formed in a substantially U shape having an opening 11. Reference numeral 2 denotes a cam rotatably supported by a cam pin 12 at a position close to the opening 11 of the main body 1, and a steel material receiving surface 11 a constituting the opening 11 is provided at one end facing the opening 11. An engagement tooth 21 for sandwiching a steel material A such as an H-shaped steel is formed, and an attachment ring portion 22 to which, for example, the tip of a wire B1 from a mobile crane B is attached is formed at the other end of the cam 2. Has been.
[0004]
In order to move the steel material A in the horizontal suspension clamp having such a configuration, when the opening 11 of the main body 1 is inserted into the periphery of the steel material A and the wire B1 is pulled up, the cam 2 is rotated clockwise in FIG. Therefore, the engagement tooth 21 holds the steel material A between the receiving surface portion 11a. As a result, it is possible to move to a desired position by pulling up the wire B1 to undulate and extend the jib B2 of the crane, and by turning the upper turning body B3.
[0005]
[Non-patent literature]
Issuer “Japan Crane Association”
Issue date “January 1, 2003”
Magazine name "Crane"
Cited part Drawing of horizontal suspension clamp in the right column “4.
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional horizontal suspension clamp, since the main body of the clamp remains left on the ground in the state where the movement of the steel material is completed as shown in FIG. When the wire is wound up, the main body moves up on the ground and then moves up. However, in the middle of moving on the ground, the steel material may get caught in the opening of the main body and may move. As a result, there is a problem that the steel material falls off the main body during the lifting and falls into a large accident when hitting an operator working in the vicinity.
[0007]
The present invention is intended to solve the above-described problems, and the object of the present invention is to prevent the steel material from being opened because the opening of the main body is closed by the suspension ring while the main body is moving on the ground. The steel material does not fall in the middle of lifting without being caught easily. Therefore, it is intended to provide a horizontal suspension clamp that can prevent an accident caused by dropping of the steel material.
[0008]
[Means for Solving the Problems]
The horizontal suspension clamp of the present invention achieves the above-mentioned object, and the means of claim 1 includes a U-shaped main body, a cam pivotally supported on the main body, and a shaft on the cam. a closure member axially supported by the wire at the distal end is attached via a member, said cam blocking member is configured Ri good spring for spring-loaded in a direction to close the opening of the body relative to, the body When the wire is dragged on the ground, the opening of the main body is closed by the closing member, and when the wire is pulled up, the closing of the opening by the closing member is released. .
[0011]
The means of claim 2 comprises a U -shaped main body, a cam pivotally supported by the main body, and a closing member pivotally supported by the cam via a shaft member and having a wire attached to the tip. The shaft member that rotatably supports the closing member with respect to the cam is divided into two shafts, and the spring is biased so that the opposing surfaces are pressed against each other, and a step portion is formed on the opposing surface. When the main body is dragged on the ground by a wire, the stepped portions are engaged with each other to close the opening of the main body by the closing member, and when the main body is pulled up by the wire, the stepped portion The opening portion by the closing member is opened by releasing the engagement between the two.
[0012]
The means of claim 3 comprises a U -shaped main body, a cam pivotally supported by the main body, and a closing member pivotally supported by the cam via a shaft member and having a wire attached to the tip. The shaft member is a fixed shaft fixed to the cam, a key is formed, and a shaft hole of a closing member rotatably supported by the fixed shaft is engageable with the key. In addition, a spring that presses the closing member toward the key is provided on the fixed shaft. When the main body is dragged on the ground by a wire, the key hole is formed in the key. When engaging and closing the opening of the main body with the closing member and pulling up the main body with the wire, the engagement state between the key and the key hole is released against the spring force of the spring. The opening by the blocking member is opened Characterized in that way the.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a horizontal suspension clamp according to the present invention will be described with reference to FIGS. Note that the same reference numerals as those of the conventional example described above denote the same parts, and a detailed description thereof will be omitted.
In the horizontal suspension clamp of the present invention, one end of the closing member 3 is pivoted by the shaft member 31 at the end opposite to the end where the engagement teeth are formed in the cam 2 pivotally supported by the opening 11 of the main body 1. The shaft member 31 is provided with a spring (not shown) for biasing the closing member in a counterclockwise direction in FIGS. A hole 32 is opened at the other end of the closing member 3, and a wire B <b> 1 is attached to the hole 32.
[0015]
That is, the closing member 3 is in a state where the pulling force (the force that drags the main body 1 on the ground, not the force that floats the main body 1 from the ground) is acting by the spring. When the pulling force by the wire B1 acts, the closing member 3 rotates in the vertical direction against the spring force of the spring to open the opening 11 when the opening 11 of the main body 1 is closed. It is configured as follows.
[0016]
Next, the operation of the horizontal suspension clamp of the present invention shown in FIG. 2 will be described. The state indicated by the phantom line is that the main body 1 is on the ground and the wire B1 is pulled leftward so that the main body 1 is leftward. Has moved to. In this state, since the closing member 3 maintains the state in which the opening 11 is closed by the spring force, the closing member 3 enters the opening 11 even when the H-type steel A is in the moving direction of the main body 1. Therefore, when the steel material A is wound up, the clamp is inadvertently bitten and caught by the steel material A, so that it is possible to prevent a disaster in which the lifted steel material A falls and collides with an operator.
[0017]
On the other hand, the operation of moving the steel material A by the clamp will be described. The cam 2 rotates in the clockwise direction in FIG. 1 and is closed in a state where the engaging teeth 21 are pressed with a finger or the like so as not to block the opening 11. By rotating the member 3 in the clockwise direction against the spring force, the steel material A is inserted into the opening 11, and then the engagement teeth 21 of the cam 2 are engaged with the steel material A and the wire B1 is pulled up to thereby raise the steel material A. On the other hand, since the engaging tooth 21 holds the steel material A with the steel material receiving surface portion 11a with an increasingly strong force, the engaging tooth 21 can be lifted safely.
[0018]
In the above-described embodiment, a spring is provided on the rotating shaft portion of the closing member 3 with respect to the cam 2 so that the closing member 3 closes the opening portion 11. However, the spring force of the spring is When the main body 1 (generally having a weight of 2 to 3 kg) is dragged on the ground, a spring force that does not open the opening 11 is sufficient, so the spring force is not so strong, but it is blocked to lift the steel material A described above. Since the member 3 must be rotated against the spring force to rotate the member 3, a little force is required.
[0019]
Therefore, a spring force acts on the rotating shaft portion of the main body 1 and the cam 2 in the direction opposite to the direction in which the engaging teeth 21 of the cam 2 are engaged even if the closing member 3 is rotated clockwise, and A force for rotating the closing member 3 to lift the steel A by attaching a spring to the cam 2 to such an extent that the closing member 3 does not rotate clockwise even if the closing member 3 is rotated clockwise. Even if it is weak, the steel material A may be inserted into the opening 11.
[0020]
Next, a second embodiment will be described with reference to FIG.
FIG. 3 shows a shaft member 4 for pivotally supporting the closing member 3 with respect to the cam 2. The shaft member 4 has a shaft 4 a fixed to the shaft hole side of the cam 2 and a shaft hole side of the closing member 3. The shaft 4b is fixed, and the two shafts 4a and 4b are configured not to be separated from each other by a connecting shaft 4c inserted between the two shafts. Further, the opposing surfaces are in contact with each other by a spring (not shown). Is spring-biased.
[0021]
Further, the step portions 4a ₁ and 4b ₁ are formed on the opposing surfaces of the shafts 4a and 4b by 180 °, and when the step portions 4a ₁ and 4b ₁ are in mesh with each other, they rotate integrally, and the spring force by the spring shaft 4a against and is moved in the direction of separating the 4b to release the engagement state of the step portion 4A1,4b _1, is possible to rotate the closure member 3 axes 4a is fixed with respect to the cam 2 It becomes possible.
[0022]
By using the shaft member 4 configured as described above, the cam 2 and the closing member 3 are pivotally supported, so that the stepped portions 4a ₁ and 4b ₁ of the shafts 4a and 4b are engaged with each other, and the closing member 3 opens the opening 11. By setting the closed position (see FIG. 3a), even if the closing member 3 is pulled in the direction of dragging on the ground by the wire B1, the shaft support portion between the closing member 3 and the cam 2 does not rotate. The closing member 3 closes the opening 11 and maintains the state, so that the steel material A is not caught during the movement of the main body 1.
[0023]
On the other hand, the operation of moving the steel material A by the clamp will be described. In this case, when the closing member 3 is moved against the spring force in the direction away from the cam 2, the step portions 4a ₁ and 4b of the shafts 4a and 4b are moved. _Since the engagement of ₁ is released, the closing member 3 is rotated and retracted from the opening 11 (see FIG. 3b). In this state, by inserting the steel material A into the opened opening 11 and pulling up the wire B1, the cam 2 rotates and the steel material A is sandwiched between the engagement tooth 21 and the steel material receiving surface portion 11a. Therefore, it can be suspended and moved.
[0024]
Next, a third embodiment will be described with reference to FIGS.
In this embodiment, an attachment ring portion 22 for pivotally supporting the closing member 3 of the cam 2 is formed in the bifurcated portion 22a, and a fixed shaft 23 having a key 23a is fixed to the bifurcated portion 22a. Yes. A shaft support hole 33 having a key hole 33a that engages with the key 23a formed at one end of the closing member 3 is rotatably supported on the fixed shaft 23. Further, on the opposite side of the fixed shaft 23 from the end where the key 23a is formed, a spring 5 is disposed for biasing the closing member 3 toward the key 23a.
[0025]
The key 23a and the key hole 33a formed on the fixed shaft 23 are arranged so that the key 23a and the key hole are formed when the closing member 3 is rotated in a direction to close the opening 11 by the closing member 3 as shown in FIG. In this state, the spring 5 is biased so as not to disengage the engagement state.
[0026]
In the embodiment configured as described above, in order to close the opening 11 of the main body 1 by the closing member 3, the key hole 33 a of the shaft support hole 33 of the closing member 3 is fixed to the cam 2. By engaging with the key 23a formed on the shaft 23, the closing member 3 closes the opening 11, so that even if the main body 1 is dragged and moved by the wire B1, the steel material A is not caught.
[0027]
On the other hand, the operation of moving the steel material A by the clamp will be described. In this case, the closing member 3 is moved against the spring force of the spring 5 to release the engagement state between the key 23a and the key hole 33a. Since the closing member 3 can be rotated and retracted from the opening 11 and the cam 2 and the closing member 3 are in a substantially straight state, the steel material A is placed in the opening 11 opened in this state. By inserting and pulling up the wire B1, the cam 2 rotates and the steel material A is sandwiched between the engaging tooth 21 and the steel material receiving surface portion 11a, and can be lifted and moved.
[0028]
In the second and third embodiments described above, when the cam 2 is pivotally supported with respect to the main body 1, the cam member 2 is subjected to a counterclockwise spring force so that the closing member 3 is camped. The cam 2 does not rotate in the clockwise direction due to the spring force even if it is dragged on the ground in a substantially right angle state (the opening 11 is closed) with respect to the opening 2. Can be prevented from being released.
[0029]
Next, a fourth embodiment will be described with reference to FIG.
In this embodiment, a closing member 7 that closes an opening 11 in a main body 1 of a known clamp is rotatably attached to an upper portion of the main body 1 constituting the opening 11. Note that the lower end of the closing member 7 is sized so as to reach the lower part of the main body 1 constituting the opening 11.
[0030]
In the clamp configured as described above, since the closing member 6 always closes the opening portion 11, the steel material A does not enter the opening portion 11 even when the main body 1 is dragged on the ground. On the other hand, when moving the steel material A, since the steel material A can be inserted into the opening 11 by manually opening the closing member 6, the cam 2 is lifted by pulling the wire B <b> 1 upward. The steel material A is pinched between the engaging tooth 21 and the steel material receiving surface part 11a by rotating, and can be suspended and moved.
[0031]
In this embodiment, the opening 11 is forcibly blocked by the spring force when dragged on the ground by biasing the closing member 6 in the direction of closing the opening 11. Therefore, insertion of the steel material A into the opening 11 can be reliably prevented.
[0032]
【The invention's effect】
In the present invention, as described above, even when the horizontal suspension clamp main body is dragged on the ground when the wire is wound up, the closing member closes the opening of the main body, and when the force that the main body is lifted by the wire acts, Since the opening portion is blocked by the closing member, even if it is a clamp with a simple structure with one additional closing member, the steel material falls in the middle of lifting without catching the steel material carelessly. Therefore, it is possible to prevent accidents caused by dropping of the steel material.
[0033]
In addition, by attaching a closing member that always closes the opening to the opening in a rotatable manner, the same effect as described above can be obtained, and a structure that is very simple and inexpensive can be manufactured. I have it.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of a horizontal suspension clamp according to the present invention.
FIG. 2 is a side view showing the operation of the above.
FIGS. 3A and 3B are perspective views of a main part showing a second embodiment, in which FIG. 3A shows a coupled state and FIG. 3B shows a state where the coupling is released;
FIG. 4 is a perspective view showing a third embodiment.
FIG. 5 is a front view of the above.
FIG. 6 is a perspective view showing a fourth embodiment.
FIG. 7 is a side view of a conventional horizontal suspension clamp.
FIG. 8 is an explanatory diagram for explaining an accident that may occur when the clamp described above is used.
[Explanation of symbols]
1 body 11 opening 11a steel retaining surface second cam 21 engaging teeth 23 fixed shaft 23a key 3,6 closure member 31 the shaft member 33 shaft supporting hole 33a keyhole 4 shaft member 4a, 4b shaft 4a _1, 4b ₁ step portion

Claims

A U-shaped main body, a cam pivotally supported by the main body, a closing member pivotally supported by the cam via a shaft member and having a wire attached to the tip; and a closing member for the cam the configure Ri good spring for spring biased in a direction to close the opening of the body, in a state where the body is dragged on the ground by a wire, closed the opening of the body by the closing member, the wire in pulling state by the horizontal hanging clamp you characterized in that the closed state of the opening by the closing member is released.

A U-shaped main body; a cam pivotally supported by the main body; and a closing member pivotally supported by the cam via a shaft member and having a wire attached to the tip. A shaft member that pivotally supports the closing member is divided into two shafts, and a spring is urged so that the opposing surfaces are pressed against each other, and a step portion is formed on the opposing surface, and the main body is a wire. When dragging on the ground, the steps are engaged with each other, the opening of the main body is closed with the closing member, and when the main body is pulled up with a wire, the engagement between the steps is released. horizontal hanging clamp you wherein an opening by the closure member is to be opened by.

A U-shaped main body, a cam pivotally supported by the main body, and a closing member pivotally supported by the cam via a shaft member and having a wire attached to the tip thereof. A fixed shaft fixed to the cam, a key is formed, and a shaft hole of a closing member rotatably supported by the fixed shaft is formed with a key hole that can be engaged with the key; Further, the fixed shaft is provided with a spring that presses the closing member toward the key. When the main body is dragged on the ground by a wire, the key hole is engaged with the key to open the main body. When the body is lifted by the wire by closing the portion with the closing member, the opening of the closing member is opened by releasing the engagement state of the key and the key hole against the spring force of the spring. To be done Horizontal hanging clamp shall be the butterfly.