JP3177360U - Screw clamp - Google Patents
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- JP3177360U JP3177360U JP2012002479U JP2012002479U JP3177360U JP 3177360 U JP3177360 U JP 3177360U JP 2012002479 U JP2012002479 U JP 2012002479U JP 2012002479 U JP2012002479 U JP 2012002479U JP 3177360 U JP3177360 U JP 3177360U
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Abstract
【目的】規定の締付トルクが実際に吊荷に働いたことを目視により確認可能であって安全性が高く且つ増し締め作業が不要な新規な構成のネジ式クランプを提供する。
【構成】クランプ本体の一方の脚部１１に取り付けた進退自在の受け金１４と他方の脚部に螺着した締付ボルトとの間に吊荷を挟んで吊り上げる形式のネジ式クランプにおいて、受け金を開口部に突出させる方向に移動付勢する付勢手段として、複数枚の皿バネ２３ａ〜２３ｃを同じ向きに重ね合わせたものを交互に反対向きにして複数段に直列させてなる皿バネ直列体２３を用いる。皿バネは、受け金を旋回自在に収容するソケット１７の奥方突起部１７ａの外径と略同一またはそれより若干大きい口径の中心開口を有し、皿バネ直列体は、皿バネの中心開口部にソケットの奥方突起部が入り込んだ状態で、脚部１１の凹部２２に収容される
【選択図】図２[Objective] To provide a screw-type clamp having a novel configuration that can visually confirm that a specified tightening torque is actually applied to a suspended load, is highly safe, and does not require additional tightening work.
[Structure] In a screw-type clamp in which a suspended load is sandwiched between a retractable receiver 14 attached to one leg 11 of a clamp body and a fastening bolt screwed to the other leg, As an urging means for moving and urging gold in the direction of projecting into the opening, a disc spring comprising a plurality of disc springs 23a to 23c stacked in the same direction and alternately arranged in opposite directions in series. A serial body 23 is used. The disc spring has a central opening having a diameter that is substantially the same as or slightly larger than the outer diameter of the rear projection 17a of the socket 17 that rotatably accommodates the receiving metal, and the disc spring series body has a central opening of the disc spring. 2 is received in the recess 22 of the leg 11 with the rear projection of the socket inserted into the socket.
Description
本考案はネジ式クランプに関する。 The present invention relates to a screw clamp.
公知のネジ式クランプは、クランプ本体の一方の脚部に受け金、他方の脚部に締付ボルトを対向配置し、これら受け金と締付ボルトとの間に吊荷を挟んだ状態でハンドル操作により締付ボルトを回転させて吊荷を圧接挟持する構成を有する。受け金は脚部内に配置されるベアリングに支持されて回転自在であるとともに、その基端部に配置されるコイルスプリングにより締付ボルトに近付く方向に付勢されている。 A known screw-type clamp has a clamp on one leg of the clamp body, a clamping bolt on the other leg, and a handle with a suspended load sandwiched between the clamp and the clamping bolt. It has a configuration in which the tightening bolt is rotated by operation to hold the suspended load in pressure contact. The receiver is supported by a bearing disposed in the leg portion and is rotatable, and is biased in a direction approaching the tightening bolt by a coil spring disposed at the base end portion thereof.
このように構成されたネジ式クランプにおいて、吊荷を受け金と締付ボルトとの間に圧接挟持した状態からさらに締付ボルトを締め付けてゆくと、まず受け金がコイルスプリングのバネ力に抗して脚部の内部に埋没する方向に後退移動し、かくして受け金が最奥位置まで移動した後になお締付ボルトを締め付けることにより、規定の締付トルク（たとえば１５０ｋｇ・ｃｍ）を吊荷に与えて安全に吊り上げることができる。 In the screw-type clamp configured as described above, when the tightening bolt is further tightened from the state where the suspended load is clamped between the clamp and the clamp bolt, the receiver first resists the spring force of the coil spring. Then, it moves backward in the direction of burying in the inside of the leg, and after tightening the tightening bolt after the receiver has moved to the innermost position, the specified tightening torque (for example, 150 kg · cm) is applied to the suspended load. Can be given and lifted safely.
しかしながら、締付ボルトなどの構成部品に錆び付きや作動不良があった場合、締付ボルトを十分に締め付けたつもりでも実際には必要な締付トルクが吊荷に働かず、吊り上げや運搬中に吊荷が落下するという重大な事故につながる危険性があった。 However, if components such as tightening bolts are rusted or malfunction, the necessary tightening torque does not actually act on the suspended load even if the tightening bolts are fully tightened, and during lifting or transporting There was a risk of a serious accident in which the suspended load dropped.
そこで、本出願人は、下記特許文献１において、吊荷を安全に吊り上げるために必要且つ十分な締付トルクが実際に吊荷に働いたことを目視により確認可能としたネジ式クランプを提案した。
この特許文献１に記載のネジ式クランプは、受け金がコイルスプリングによるバネ圧に抗して脚部内に埋没する方向に所定距離移動したことを目視確認する手段を備えることにより、規定の締付トルクが吊荷に働いたことを目視により確認可能としている。このような締付確認手段の一例は、受け部材の先端側に設けられた締付確認ラインであって、締付トルクが不十分なときは該締付確認手段が開口部に露出しているが規定の締付トルクが吊荷に働いたときに該締付確認手段が一方の脚部内に埋没する。 The screw-type clamp described in Patent Document 1 is provided with means for visually confirming that the receiving plate has moved a predetermined distance in the direction of being buried in the leg portion against the spring pressure of the coil spring. It is possible to visually confirm that the torque has acted on the suspended load. An example of such a tightening confirmation means is a tightening confirmation line provided on the front end side of the receiving member, and when the tightening torque is insufficient, the tightening confirmation means is exposed at the opening. When the specified tightening torque is applied to the suspended load, the tightening confirmation means is buried in one leg.
特許文献１記載のネジ式クランプにおいては受け金を締付ボルトに近づける方向に付勢するための付勢手段としてコイルスプリングが採用されているが、その寸法的制限やネジ式クランプの本体形状などの条件により、規定の締付トルク値における推力（摩擦係数や締付ボルトの径・ピッチなどによって変動するが、締付トルク値が１５０ｋｇ・ｃｍであるとき、約３９５ｋｇ）に見合ったバネ圧を生じさせることがきわめて困難であり、実際には該推力の２０〜３０％程度のバネ圧しかないコイルスプリングを採用せざるを得ない。このため、規定の締付トルクが働く以前にコイルスプリングが撓んでしまい、締付確認ラインが埋没しても実際には規定の締付トルクが働いていない状態となっている恐れがあった。したがって、締付確認ラインが埋没した後にトルクレンチなどで規定の締付トルクで締め付ける必要があり、作業が繁雑になっていた。 In the screw-type clamp described in Patent Document 1, a coil spring is employed as a biasing means for biasing the receiver in a direction approaching the tightening bolt. However, the dimensional restrictions, the body shape of the screw-type clamp, etc. The spring pressure corresponding to the thrust at the specified tightening torque value (varies depending on the friction coefficient, tightening bolt diameter and pitch, etc., but approximately 395 kg when the tightening torque value is 150 kg · cm). It is extremely difficult to generate, and in fact, a coil spring having only a spring pressure of about 20 to 30% of the thrust has to be employed. For this reason, the coil spring is bent before the specified tightening torque is applied, and even if the tightening confirmation line is buried, there is a possibility that the specified tightening torque is not actually applied. Therefore, it is necessary to tighten with a specified tightening torque with a torque wrench after the tightening confirmation line is buried, and the work is complicated.
また、この従来のネジ式クランプにおいては、規定の締付トルクが発生するのは締付ボルトの最後の一締め（たとえば約１／１０回転）であり、コイルスプリングが締付確認ラインまで緩んだ状態では規定の約１／５程度の締付トルクしか得られていない。したがって、吊荷の揺れや交番荷重の作用などによって締付ボルトが少しでも回転して緩んでしまうと、吊荷に働く締付トルクが大幅に低下し、安全性を確保することができない。たとえば、締付ボルトが約１／１０回転緩むと締付トルクは実質的にゼロとなり、場合によっては吊荷が落下する危険が生じる。また、吊荷が着地して荷重がゼロになると、受け金および締付ボルトの先端歯が吊荷に食い込んだ分だけ締付ボルトが緩んだことと同じ状態となるため、荷重が作用と解除（ゼロ）とを繰り返す作業では、必ず増し締めを行う必要があった。 In this conventional screw type clamp, the specified tightening torque is generated at the last tightening of the tightening bolt (for example, about 1/10 turn), and the coil spring is loosened to the tightening confirmation line. In the state, only a specified tightening torque of about 1/5 is obtained. Therefore, if the tightening bolt rotates and loosens even a little due to the action of the suspended load or the action of an alternating load, the tightening torque acting on the suspended load is greatly reduced, and safety cannot be ensured. For example, when the tightening bolt is loosened by about 1/10 of a turn, the tightening torque becomes substantially zero, and in some cases, there is a risk that the suspended load falls. In addition, when the suspended load lands and the load becomes zero, the load is applied and released because the tightening bolt is loosened by the amount of the tip teeth of the catcher and the tightening bolt entering the suspended load. In the work of repeating (zero), it was necessary to retighten.
そこで本考案は、上記課題を解決し、規定の締付トルクが実際に吊荷に働いたことを目視により確認可能であって安全性が高く且つ増し締め作業が不要な新規な構成のネジ式クランプを提供することを目的とする。 Therefore, the present invention solves the above-mentioned problems, and can be confirmed by visual observation that the specified tightening torque has actually acted on the suspended load, and has a new configuration that is highly safe and does not require additional tightening work. The object is to provide a clamp.
この目的を達成するため、請求項１にかかる本考案は、開口部を挟んで対向する一対の脚部を有する概してＵ字形のクランプ本体と、一方の脚部に進退可能に取り付けられる受け金と、他方の脚部に螺着されて軸方向に進退可能な締付ボルトと、受け金を開口部に突出させる方向に移動付勢する付勢手段とを備えたネジ式クランプにおいて、前記付勢手段は一枚の皿バネまたは複数枚の皿バネを同じ向きに重ね合わせたものを交互に反対向きにして複数段に直列させてなる皿バネ直列体として構成され、この皿バネ直列体における皿バネは、受け金を旋回自在に収容するソケットの奥方突起部の外径と略同一またはそれより若干大きい口径の中心開口を有しており、且つ、前記一方の脚部に、前記開口部に臨む第一の凹部と、この第一の凹部の更に奥方に形成される第一の凹部より小径である第二の凹部とが形成され、第一の凹部には前記ソケットの主部が進退可能に収容されると共に、第二の凹部には前記皿バネの中心開口部に前記ソケットの奥方突起部が入り込んだ状態で前記皿バネ直列体が収容され、該皿バネ直列体が所定の撓み状態となって受け金と締付ボルトとの間に圧接挟持される吊荷に対して規定の締付トルクが働いたときに、前記ソケットが第一の凹部と第二の凹部との間の段差面に当接して皿バネ直列体がそれ以上撓むことを規制することを特徴とする。 In order to achieve this object, the present invention according to claim 1 includes a generally U-shaped clamp body having a pair of legs facing each other across an opening, and a receiver attached to one leg so as to be able to advance and retract. The screw-type clamp comprising: a fastening bolt that is screwed to the other leg portion and is capable of moving forward and backward in an axial direction; and a biasing means that moves and biases the receiving metal in a direction in which the receiving metal protrudes into the opening. The means is configured as a disc spring series body in which one disc spring or a plurality of disc springs stacked in the same direction are alternately arranged in series and arranged in a plurality of stages. The spring has a central opening having a diameter that is substantially the same as or slightly larger than the outer diameter of the rear protrusion of the socket that rotatably accommodates the receiving metal, and the opening on the one leg. The first recess and the first recess A second recess and is formed smaller in diameter than the first recess formed further deeper, the the first recess main portion of the socket is housed retractable, the second recess wherein The disc spring series body is accommodated in a state in which the rear projection of the socket is inserted into the central opening of the disc spring, and the disc spring series body is in a predetermined bending state between the receiver and the clamping bolt. When a specified tightening torque is applied to the suspended load, the socket comes into contact with the step surface between the first recess and the second recess, and the disc spring series body is further bent. It is characterized by restricting.
請求項２にかかる本考案は、請求項１記載のネジ式クランプにおいて、前記皿バネ直列体の全撓み量が無負荷状態のバネ高さの７５％になったときに前記所定の撓み状態となることを特徴とする。 According to a second aspect of the present invention, in the screw-type clamp according to the first aspect, when the total amount of deflection of the disc spring series body is 75% of the unloaded spring height, It is characterized by becoming.
請求項３にかかる本考案は、請求項１または２記載のネジ式クランプにおいて、受け金と締付ボルトとの間に圧接挟持される吊荷に対して規定の締付トルクが働いたときの受け金の位置を目視確認する締付確認手段を更に備えたことを特徴とする。 The present invention according to claim 3 is the screw-type clamp according to claim 1 or 2, wherein a specified tightening torque is applied to a suspended load that is pressed and clamped between the receiver and the tightening bolt. A tightening confirmation means for visually confirming the position of the receiving metal is further provided.
（削除） (Delete)
本考案のネジ式クランプによれば、受け金を移動付勢する付勢手段として皿バネを用い、その最大撓みの状態で、締付ボルトと受け金との間に吊荷を挟んで規定の締付トルクで締め付けたときに締付ボルトに働く推力に対応したバネ圧を発生するように構成されているので、従来のコイルスプリングを用いた場合のように締付ボルトのごく僅かな緩みで吊荷に働く締付トルクが極端に低下してしまうことがなく、安全性を大幅に向上させることができる。 According to the screw-type clamp of the present invention, a disc spring is used as a biasing means for moving and biasing the receiver, and in the maximum deflection state, a suspended load is sandwiched between the clamping bolt and the receiver. Since it is configured to generate a spring pressure corresponding to the thrust acting on the tightening bolt when tightened with a tightening torque, the tightening bolt can be slightly loosened as with conventional coil springs. The tightening torque acting on the suspended load is not extremely reduced, and the safety can be greatly improved.
皿バネはコイルスプリングに比べて比較的小さなスペース、小さな撓み量で大きな荷重を負荷することができる特性を備えている。たとえば同じ荷重（４５０ｋｇｆ）のときに同じ撓み量（７．２ｍｍ）となるように設計した例によれば、コイルスプリングの場合は線径１０ｍｍ×中心径４０ｍｍ×高さ４２．２ｍｍを必要とするのに対し、皿バネの場合は板厚１．６ｍｍ×外径２８ｍｍ×内径１５．７ｍｍ×高さ２．２ｍｍのものを互い違いの向きで１２枚直列させた合計高さ２６．４ｍｍの皿バネ直列体を用いれば良く、体積比にして約２５％で足りる。このため、限られたスペースに配置することが要求されるネジ式クランプにおける受け金付勢手段として好適に使用することができる。 The disc spring has a characteristic that a large load can be applied with a relatively small space and a small amount of deflection compared to the coil spring. For example, according to an example designed to have the same amount of deflection (7.2 mm) at the same load (450 kgf), the coil spring requires a wire diameter of 10 mm × a center diameter of 40 mm × a height of 42.2 mm. On the other hand, in the case of a disc spring, a disc spring having a total height of 26.4 mm in which twelve pieces having a plate thickness of 1.6 mm, an outer diameter of 28 mm, an inner diameter of 15.7 mm, and a height of 2.2 mm are arranged in a staggered direction. A series body may be used, and a volume ratio of about 25% is sufficient. For this reason, it can be suitably used as a receiving member biasing means in a screw type clamp that is required to be arranged in a limited space.
また、規定の締付トルクが実際に吊荷に働いていることを締付確認手段によって容易に目視確認することができるので、クレーン等による吊り上げや運搬時に吊荷が落下する危険を未然に回避して、作業の安全性を確保することができる。 In addition, since it is possible to easily visually check that the specified tightening torque is actually acting on the suspended load by means of the tightening confirmation means, it is possible to avoid the danger of the suspended load falling during lifting or transportation by a crane or the like. Thus, work safety can be ensured.
また、締付確認手段で、規定の締付トルクが確実に吊荷に働いていることが確認できるため、増し締めを行う必要がない。 Further, since the tightening confirmation means can confirm that the specified tightening torque is working on the suspended load, it is not necessary to perform additional tightening.
さらに、皿バネが無負荷状態から所定の撓み状態に至るまでの合計撓み量を締付ボルトのネジピッチの１／３以上、または１／２以上、または２／３以上、または３／４以上とすることにより、吊荷の揺れや交番荷重の作用などによって締付ボルトが若干回転した場合であっても、吊荷に作用する締付トルクは大幅に低下せず、安全性を確保することができる。 Further, the total amount of bending from the unloaded state to the predetermined bending state of the disc spring is 1/3 or more, 1/2 or more, 2/3 or more, or 3/4 or more of the screw pitch of the tightening bolt. As a result, even if the tightening bolt rotates slightly due to the swinging load or the action of an alternating load, the tightening torque acting on the suspended load will not drop significantly, ensuring safety. it can.
また、本考案の好適な実施形態では、一方の脚部に開口部に臨む第一の凹部と、この第一の凹部の更に奥方に形成される第一の凹部より小径である第二の凹部とを形成し、第一の凹部には受け金を旋回自在に受容するソケットを進退可能に収容すると共に、第二の凹部には皿バネよりなる付勢手段を収容するものとして、この付勢手段が所定の撓み状態となったときにソケットが第一の凹部と第二の凹部との間の段差面に当接するように構成している。 Further, in a preferred embodiment of the present invention, a first recess facing the opening on one leg, and a second recess having a smaller diameter than the first recess formed further behind the first recess. The first recess is configured to accommodate a socket for pivotably receiving the receiving metal, and the second recess is configured to receive a biasing means including a disc spring. The socket is configured to come into contact with a step surface between the first recess and the second recess when the means is in a predetermined bending state.
図１は本考案によるネジ式クランプの一実施形態を示す。 FIG. 1 shows an embodiment of a screw-type clamp according to the present invention.
略Ｕ字形のクランプ本体１０は脚部１１，１２を有し、これら脚部の間に吊荷（図示せず）を挿入するための開口部１３が形成されている。 The substantially U-shaped clamp body 10 has legs 11 and 12, and an opening 13 for inserting a suspended load (not shown) is formed between the legs.
一方の脚部１１には受け金１４が進退自在に取り付けられている。受け金１４は球面状の先端歯１５を備えている。受け金１４の球状基端部１６は球状に形成され、ソケット１７の球状凹部に旋回自在に収容され、且つ、サークリップ１８で抜け落ち防止されている。符号１９は圧縮バネであり、受け金１４を図１および図２に示す常態に維持するよう常時付勢しつつ、旋回を許容している。 A receiver 14 is attached to one leg portion 11 so as to freely advance and retract. The receiver 14 includes spherical tip teeth 15. The spherical base end portion 16 of the receiving metal 14 is formed in a spherical shape, is rotatably accommodated in a spherical concave portion of the socket 17, and is prevented from falling off by a circlip 18. Reference numeral 19 denotes a compression spring, which allows turning while constantly energizing the receiver 14 to maintain the normal state shown in FIGS. 1 and 2.
ソケット１７の前端部の外周面には周回溝（符号なし）が刻設されており、この周回溝内に締付確認手段としての締付確認リング２０が嵌着されている。締付確認リング２０には着色を施す等により容易に目視確認できるようにしておくことが好ましい。 A circumferential groove (not indicated) is formed on the outer peripheral surface of the front end portion of the socket 17, and a tightening confirmation ring 20 as a tightening confirmation means is fitted into the circumferential groove. It is preferable that the tightening confirmation ring 20 be easily visually confirmed by coloring or the like.
ソケット１７は、開口部１３に臨むように脚部１１に形成された円形断面の凹部２１に軸方向に移動可能に設けられている。凹部２１の奥方には若干小径の凹部２２が形成されており、この凹部には複数の皿バネを直列に配してなる皿バネ直列体２３がソケット１７の軸方向移動を付勢するための付勢手段として収容されている。この実施形態では、ソケット１７の奥方突起部１７ａの外径と略同一またはそれより若干大きい口径の中心開口を有する皿バネ２３ａ〜２３ｃ（より詳細に言えば各皿バネは２枚の皿バネを並列に重ね合わせたものである）を直列に配して皿バネ直列体２３とし、ソケット１７の後面に当接させた座金２４および凹部２２の底面に配置した座金２５，２５との間に配置している。符号２６は、ソケット１７が凹部２１から抜け落ちることを防止するためにソケット１７側面の凹溝１７ｂに係止させた六角穴付き止めネジである。ソケット１７の軸方向移動を許容するため、凹溝１７ｂは所要の軸方向長さに亘る幅寸法を有しており、したがって、ソケット１７は皿バネ直列体２３としてのトータルのバネ圧に抗して図２の状態から図において下方に相対移動可能である。 The socket 17 is provided so as to be movable in the axial direction in a concave portion 21 having a circular cross section formed in the leg portion 11 so as to face the opening portion 13. A concave portion 22 having a slightly small diameter is formed in the depth of the concave portion 21, and a conical spring series body 23 formed by arranging a plurality of disc springs in series in the concave portion is for energizing the axial movement of the socket 17. It is accommodated as a biasing means. In this embodiment, the disc springs 23a to 23c having a central opening having a diameter substantially the same as or slightly larger than the outer diameter of the rear projection 17a of the socket 17 (more specifically, each disc spring has two disc springs. Are arranged in series to form a disc spring series body 23, which is disposed between a washer 24 abutted against the rear surface of the socket 17 and washers 25, 25 disposed on the bottom surface of the recess 22. is doing. Reference numeral 26 denotes a hexagon socket set screw that is engaged with the concave groove 17 b on the side surface of the socket 17 in order to prevent the socket 17 from falling out of the concave portion 21. In order to allow the socket 17 to move in the axial direction, the groove 17b has a width dimension over the required axial length, and therefore the socket 17 resists the total spring pressure as the disc spring series body 23. Thus, relative movement is possible downward from the state of FIG.
他方の脚部１２には締付ボルト２７が進退自在に取り付けられている。締付ボルト２７は、脚部１２を貫通して形成された雌ネジ（図示せず）と螺合する雄ネジ２８を外周面に備えると共に、その後端にはハンドル２９が装着されており、ハンドル２９を回すことによりボルト２７を軸方向に進退させることができる。締付ボルト２７の先端には、サークリップ３０によって抜け止めされつつパッド３１が装着され、パッド３１の先端には吊荷面に対する摩擦抵抗を高めるための凹凸状係合歯３２が形成されている。この実施形態で用いた締付ボルト２７のネジピッチは２ｍｍである。 A fastening bolt 27 is attached to the other leg portion 12 so as to freely advance and retract. The tightening bolt 27 has a male screw 28 screwed into a female screw (not shown) formed through the leg 12 on the outer peripheral surface, and a handle 29 is attached to the rear end thereof. By turning 29, the bolt 27 can be moved back and forth in the axial direction. A pad 31 is attached to the tip of the tightening bolt 27 while being prevented from being removed by the circlip 30, and concave and convex engaging teeth 32 are formed on the tip of the pad 31 for increasing the frictional resistance against the suspended load surface. . The screw pitch of the tightening bolt 27 used in this embodiment is 2 mm.
以上のように構成されたネジ式クランプにおいて、開口部１３に吊荷を挿入してハンドル２９を回して締付ボルト２７を突出させる方向に移動させ、パッド３１の先端係合歯３２と受け金１４の先端係合歯１５との間で吊荷を圧接挟持する。当初、締付確認リング２０は開口部１３に露出していて作業者により目視できる位置にあるが、締付ボルト２７の突出方向移動が進むにつれて、皿バネ２３ａ〜２３ｃが撓んでソケット１７が凹部２１の奥方まで収容され、締付確認リング２０が脚部１１内に完全に埋没して見えなくなる。これにより、作業者は、吊荷に対して規定の締付トルク（たとえば１５０ｋｇ・ｃｍ）が働いたことを確認することができ、クレーン（図示せず）等による吊り上げ・運搬を吊荷の落下の危険を伴わずに安全に行うことができる。 In the screw-type clamp configured as described above, a suspended load is inserted into the opening 13 and the handle 29 is rotated to move the tightening bolt 27 in a protruding direction. The suspended load is press-clamped between the 14 tip engagement teeth 15. Initially, the tightening confirmation ring 20 is exposed to the opening 13 and is in a position that can be seen by the operator. However, as the tightening bolt 27 moves in the protruding direction, the disc springs 23a to 23c are bent and the socket 17 is recessed. The fastening confirmation ring 20 is completely buried in the leg portion 11 and is not visible. As a result, the operator can confirm that a specified tightening torque (for example, 150 kg · cm) has been applied to the suspended load, and the suspended load can be lifted and transported by a crane (not shown). It can be done safely without risk.
締付ボルト２７に発生する推力Ｗは、締付トルクＴとの関係において次式で定められる。 The thrust W generated in the tightening bolt 27 is determined by the following equation in relation to the tightening torque T.
また、皿バネ直列体２３が無負荷状態（図１および図２）から所定の撓み状態に至るまでの合計撓み量は、締付ボルト２７のネジピッチの１／３、１／２、２／３、３／４などとすることができる。これにより、締付ボルト２７と受け金１４との間に圧接挟持した吊荷が運搬中に揺れたり、交番荷重が作用したりすることによって締付ボルト２７が若干回転した場合であっても、吊荷に作用する締付トルクを大幅に低下させることなく安全性を確保することができる。 Further, the total amount of bending from the no-load state (FIGS. 1 and 2) to the predetermined bending state of the disc spring series body 23 is 1/3, 1/2, 2/3 of the screw pitch of the tightening bolt 27. 3/4, etc. Thereby, even if the tightening bolt 27 is slightly rotated due to the suspended load that is clamped between the tightening bolt 27 and the receiver 14 swaying during transportation or an alternating load is applied, Safety can be secured without significantly reducing the tightening torque acting on the suspended load.
皿バネ直列体２３は、皿バネの枚数および組み合わせを変えることによって種々の荷重特性が得られる。皿バネの向きを反対にして複数段に直列した場合、同じ荷重が作用したときの合計撓み量が一段の場合の段数倍となる。皿バネの向きを同じにして複数枚を重ね合わせた場合、一枚の場合と比べて枚数倍の荷重が作用したときに同じ撓み量となる。 The disc spring series body 23 can obtain various load characteristics by changing the number and combination of disc springs. When the direction of the disc spring is reversed and serially arranged in a plurality of stages, the total amount of deflection when the same load is applied is the number of stages that is one stage. When a plurality of sheets are stacked with the disc springs oriented in the same direction, the same amount of deflection is obtained when a load that is twice as many as that of a single sheet is applied.
図３は、ある皿バネを用いた皿バネ直列体２３における枚数および組み合わせを様々に変えて荷重（バネ圧）、全高および撓み量を表にして示したものである。この結果から、この皿バネを６枚用い、２枚ずつを同じ向きにして重ね合わせたもの（図２参照）を互いに反対向きにして３段に直列させた皿バネ直列体を用いると、所定の撓み状態（０．７５ｈ）のときに規定の締付トルクに対応する締付推力（この場合は約３９５ｋｇ）に見合った荷重が得られ、且つ、このときの合計撓み量が１．５３ｍｍであって締付ボルト２７のネジピッチ（２ｍｍ）の約３／４であることから、この実施形態の皿バネ直列体２３として用いるに最適なものであることが分かる。 FIG. 3 is a table showing the load (spring pressure), the total height, and the amount of deflection by changing the number and combination of the disc spring series body 23 using a disc spring. From this result, when six disc springs are used and two disc springs are stacked in the same direction (see FIG. 2), a disc spring series body in which the disc springs are arranged in three stages in opposite directions is used. A load commensurate with the tightening thrust (in this case, about 395 kg) corresponding to the specified tightening torque is obtained in the state of bending (0.75 h), and the total amount of bending at this time is 1.53 mm. Since it is about 3/4 of the thread pitch (2 mm) of the tightening bolt 27, it can be seen that it is optimal for use as the disc spring series body 23 of this embodiment.
皿バネ直列体２３の合計撓み量が締付ボルト２７のネジピッチの３／４であるということは、吊荷の揺れなどの原因で締付ボルト２７が緩む場合があるとしても、その緩みが３／４回転に達するまでは徐々に（比例的に）バネ圧（したがって締付トルク）が低下し、３／４回転に達したときに締付トルクがゼロとなることを意味している。実際問題として、吊荷の揺れなどの原因で締付ボルト２７が緩む場合であってもその緩みはせいぜい１／１０回転程度であり、この場合、前述のようにコイルスプリングを用いた従来のネジ式クランプでは締付トルクが３０ｋｇ・ｃｍ以下、極端な場合には実質的にゼロになってしまうが、皿バネ直列体２３を用いた場合には２０ｋｇ・ｃｍのトルク低下が生ずるにすぎず、１３０ｋｇ・ｃｍの締付トルクが残るので吊荷落下の危険はない。すなわち、本考案の皿バネを用いたネジ式クランプによれば、従来のコイルスプリングを用いたネジ式クランプに比べて、緩み防止効果が格段に向上する。 The total deflection amount of the disc spring series body 23 is 3/4 of the thread pitch of the tightening bolt 27. This means that even if the tightening bolt 27 may be loosened due to the swing of the suspended load, the looseness is 3 This means that the spring pressure (and thus the tightening torque) gradually decreases (proportionalally) until / 4 rotation is reached, and the tightening torque becomes zero when it reaches 3/4 rotation. As a matter of fact, even when the tightening bolt 27 is loosened due to the swing of the suspended load, the loosening is at most about 1/10 rotation. In this case, the conventional screw using the coil spring as described above is used. In the case of the type clamp, the tightening torque is 30 kg · cm or less, and in an extreme case, the torque is substantially zero. However, when the disc spring series body 23 is used, only a torque drop of 20 kg · cm occurs. Since a tightening torque of 130 kg · cm remains, there is no danger of falling suspended loads. That is, according to the screw type clamp using the disc spring of the present invention, the loosening prevention effect is remarkably improved as compared with the conventional screw type clamp using the coil spring.
図１および図２に示す実施形態では締付確認手段としてリング２０を用いているが、これに限定されるものではなく、たとえばリング２０の嵌着位置に対応するソケット１７の前端部に目立つ色で塗装を施すことで締付確認手段とすることができる。 In the embodiment shown in FIG. 1 and FIG. 2, the ring 20 is used as the tightening confirmation means. However, the present invention is not limited to this. For example, the color that stands out at the front end of the socket 17 corresponding to the fitting position of the ring 20 By applying the coating, it can be used as a tightening confirmation means.
なお、皿バネは全撓み量が７５％を越えると荷重が急激に増加するため、ＤＩＮでは使用最大撓みをδ＝０．７５ｈ（ｈは無負荷状態のバネ高さ）と規定している。このため、図示実施形態では、皿バネ直列体２３の所定の撓み状態を許容撓み量を０．７５ｈ（すなわち皿バネ直列体２３の無負荷状態時の全高ｈの３／４）として、皿バネ直列体２３が０．７５ｈまで撓んだときにソケット１７が凹部２１と小径凹部２２との間の段差面３３に当接し、このときに締付確認リング２０が埋没して見えなくなるように構成している。したがって、締付確認リング２０が外部から観察されない限り、吊荷には規定の締付トルクが作用していることが確認できる。 In addition, since the load increases sharply when the total amount of deflection of the disc spring exceeds 75%, DIN defines the maximum deflection to be used as δ = 0.75h (h is the height of the spring in an unloaded state). For this reason, in the illustrated embodiment, the disc spring is defined as a predetermined deflection state of the disc spring series body 23 with an allowable deflection amount of 0.75 h (that is, 3/4 of the total height h in the no-load state of the disc spring series body 23). The configuration is such that when the serial body 23 is bent to 0.75 h, the socket 17 comes into contact with the step surface 33 between the concave portion 21 and the small-diameter concave portion 22, and at this time, the tightening confirmation ring 20 is buried and cannot be seen. is doing. Therefore, unless the tightening confirmation ring 20 is observed from the outside, it can be confirmed that the specified tightening torque is acting on the suspended load.
１０ クランプ本体
１１ 脚部
１２ 脚部
１３ 開口部
１４ 受け金
１５ 先端係合歯
１６ 球状基端部
１７ ソケット
１８ サークリップ
１９ 圧縮バネ
２０ 締付確認リング
２１ 凹部（第一の凹部）
２２ 小径凹部（第二の凹部）
２３ 皿バネ直列体（付勢手段）
２３ａ〜２３ｃ ２枚重ねの皿バネ
２４ 座金
２５ 座金
２６ 六角穴付き止めネジ
２７ 締付ボルト
２８ 雄ネジ
２９ ハンドル
３０ サークリップ
３１ パッド
３２ 先端係合歯
３３ 段差面
DESCRIPTION OF SYMBOLS 10 Clamp main body 11 Leg part 12 Leg part 13 Opening part 14 Receptacle 15 End engaging tooth 16 Spherical base end part 17 Socket 18 Circlip 19 Compression spring 20 Tightening confirmation ring 21 Recessed part (1st recessed part)
22 Small-diameter recess (second recess)
23 Disc spring series body (biasing means)
23a to 23c Double plate spring 24 Washer 25 Washer 26 Hexagon socket set screw 27 Tightening bolt 28 Male screw 29 Handle 30 Circlip 31 Pad 32 Tip engagement tooth 33 Step surface
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012002479U JP3177360U (en) | 2012-04-26 | 2012-04-26 | Screw clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012002479U JP3177360U (en) | 2012-04-26 | 2012-04-26 | Screw clamp |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012100585 Continuation | 2005-09-07 |
Publications (1)
| Publication Number | Publication Date |
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| JP3177360U true JP3177360U (en) | 2012-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012002479U Expired - Lifetime JP3177360U (en) | 2012-04-26 | 2012-04-26 | Screw clamp |
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| Country | Link |
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| JP (1) | JP3177360U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5629357B1 (en) * | 2013-06-21 | 2014-11-19 | ナシモト工業株式会社 | Work equipment |
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| JPS5243062A (en) * | 1975-10-02 | 1977-04-04 | Eagle Kuranpu Kk | Screw type clamp |
| JPS6338932U (en) * | 1986-08-28 | 1988-03-12 | ||
| JPH0624863U (en) * | 1992-09-01 | 1994-04-05 | 株式会社タカハシ | Work fixing device |
| JPH08312611A (en) * | 1995-05-19 | 1996-11-26 | Super Tool:Kk | Clamp |
| JPH1086023A (en) * | 1996-09-12 | 1998-04-07 | Fuji Seiko Kk | Tool holder |
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| JP2000180323A (en) * | 1998-12-10 | 2000-06-30 | Ohbayashi Corp | Constant-load giving apparatus |
| JP2001162436A (en) * | 1999-12-03 | 2001-06-19 | Honda Motor Co Ltd | Clamp device |
| JP2002205279A (en) * | 2001-01-11 | 2002-07-23 | Eagle Kuranpu Kk | Screw type clamp |
| JP2002306627A (en) * | 2001-04-17 | 2002-10-22 | Yoshida Kojo:Kk | Pressure reducing valve |
| JP2004161117A (en) * | 2002-11-12 | 2004-06-10 | Toyota Motor Corp | Steering mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5243062A (en) * | 1975-10-02 | 1977-04-04 | Eagle Kuranpu Kk | Screw type clamp |
| JPS6338932U (en) * | 1986-08-28 | 1988-03-12 | ||
| JPH0624863U (en) * | 1992-09-01 | 1994-04-05 | 株式会社タカハシ | Work fixing device |
| JPH08312611A (en) * | 1995-05-19 | 1996-11-26 | Super Tool:Kk | Clamp |
| JPH1086023A (en) * | 1996-09-12 | 1998-04-07 | Fuji Seiko Kk | Tool holder |
| JPH10110671A (en) * | 1996-10-04 | 1998-04-28 | Hitachi Ltd | Variable capacity swash plate type liquid pressure machine |
| JP2000180323A (en) * | 1998-12-10 | 2000-06-30 | Ohbayashi Corp | Constant-load giving apparatus |
| JP2001162436A (en) * | 1999-12-03 | 2001-06-19 | Honda Motor Co Ltd | Clamp device |
| JP2002205279A (en) * | 2001-01-11 | 2002-07-23 | Eagle Kuranpu Kk | Screw type clamp |
| JP2002306627A (en) * | 2001-04-17 | 2002-10-22 | Yoshida Kojo:Kk | Pressure reducing valve |
| JP2004161117A (en) * | 2002-11-12 | 2004-06-10 | Toyota Motor Corp | Steering mechanism |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5629357B1 (en) * | 2013-06-21 | 2014-11-19 | ナシモト工業株式会社 | Work equipment |
| WO2014203578A1 (en) * | 2013-06-21 | 2014-12-24 | ナシモト工業株式会社 | Work device |
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