JP2004257487A

JP2004257487A - Half nut device

Info

Publication number: JP2004257487A
Application number: JP2003049514A
Authority: JP
Inventors: Atsuya Shinohara; 敦也篠原; Daisuke Hirokawa; 大輔広川
Original assignee: HIRATA VALVE INDUSTRY CO Ltd
Current assignee: HIRATA VALVE INDUSTRY CO Ltd
Priority date: 2003-02-26
Filing date: 2003-02-26
Publication date: 2004-09-16
Anticipated expiration: 2023-02-26
Also published as: JP3817524B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a half nut device capable of easily and reliably performing attachment/detachment in one operation. <P>SOLUTION: The half nut device comprises a screw rod 10, and half nut bodies 20a and 20b to be attachably/detachably screwed to the screw rod 10 by an attaching/detaching device 40. In the half nut bodies 20a and 20b, the interval L is formed in flat parts 24 and 24 facing substantially parallel to the inner side, a thread recessed part 25 is provided in a center part of the flat part 24, and cut-off parts 23 and 23 are provided in corner parts of the thread recessed part 25 and the flat part 24. In addition, springs 21 and 21 to urge the half nut bodies in a separating direction from each other, and spacers 22, 22, 22 and 22 to limit the close distance to a predetermined value are provided between the half nut bodies 20a and 20b. Springs 41 and 41 having the spring force capable of reducing the distance between the half nut bodies 20a and 20b against the urging force of the springs 21 and 21 are interposed in the attaching/detaching device 40. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ハーフナット装置（割ナット装置とも称する。）に関するものである。
【０００２】
【従来の技術】
従来、ハーフナット装置は、旋盤などの送りの、掛け外し用に汎用され、螺子棒を間にした一対のハーフナット体を、ハンドルに設けたカム等で接離方向に移動させ、この両ハーフナット体の間隔を狭めると螺子棒に両ハーフナット体が螺合し、両者の間隔を広げるとこの螺合が外れるようになし、両者が螺合した状態で螺子棒又はハーフナット体のいずれか一方を固定して他方を回転させると、一方側が螺進退するようになし、両ハーフナット体の螺合を外すと他方側を回転させても螺進退はしないようになしたもので、この種の構成は「特許文献１」及び「非特許文献１」にも開示されてる。
【０００３】
しかし、この種のハーフナット装置は、掛け外しのために両ハーフナット体を接離方向に移動する距離が意外と大きく要求されるので、両ハーフナット体の駆動機構が大型になったり、操作に時間がかかるという問題点を有している。そこで、この問題点を回避するために、各ハーフナット体は正確な二分割ではなく、二分割より小さく、言い換えると、正確な半分よりも小さく形成して、螺子棒の半周未満で螺合するようになして、螺合面積は低減するも、移動距離が小さくても掛け外しができるようになしているのが一般的で、「非特許文献１」にもこの技術が図示されている。
【０００４】
また、「特許文献１」の「図３」に開示されているように、ハーフナット体と螺子棒との螺合部を、該螺子棒の半周未満とすると共に、ハーフナット体を平面から見て螺合部の両端を削り取って、さらに移動距離が小さくても掛け外しができるようになしたものも提案されている。
【０００５】
上記移動距離の低減は図１０に示すように、ハーフナット体２０ａ，２０ｂが正確な二分割ナットである同図の左側の場合、螺合が着脱できるハーフナット体２０ａ，２０ｂの移動距離（ハーフナット体２０ａ，２０ｂの片側の移動距離）は、同図の上下に示す移動距離Ｂ１／２が必要であるのに対し、図１０の右側に示す例では（Ｃ−Ａ）／２でよく、図示からも、Ｂ１／２＞（Ｃ−Ａ）／２であることが一見して明らかである。
【０００６】
上記のごとき従来例によって、ハーフナット体の移動距離が小さくても掛け外しが可能となったが、なお、ハーフナット体と螺子棒との螺合の着脱にはタイミングが必要であるとされ、螺子棒とハーフナット体とが噛み込んだ状態で、その着脱が不能となる場合があり、また、螺子棒の螺条の山とハーフナットの内周螺条の山とが重なって両者が適格に螺合しないということがあり、一般的には、ハーフナット体又は螺子棒のいずれか一方を回転しつつ、該ハーフナット体を手動で半径方向に移動させて、作業者が螺合の着脱のタイミングをとる必要性があり、迅速な掛け外しは難しいものであるという問題点が残っている。
【０００７】
また、この種のハーフナット装置は、図示実施例のような、大型弁の開閉操作を、自動と手動とに切り替えるような場合、操作部間の距離の問題や、操作時に必要とする力の問題等で、ハーフナットと螺子棒との双方を停止状態のままで確実に掛け外しする要望もあるもので、従来例では完全に満足できるものではなかった。
【０００８】
【特許文献１】
特開平９−４２５１７号公報（図３）
【非特許文献１】
別役万愛編「ＭＥＣＨＡＮＩＳＭ」株式会社技報堂出版、昭和３０年１１月３０日発行Ｐ．３５５３５図
【０００９】
【発明が解決しようとする課題】
そこで、本発明は、上記の問題点及び要望に鑑みなされたもので、ワンタッチで容易・確実に掛け外しができるハーフナット装置を提供することを課題としたものである。
【００１０】
【課題を解決するための手段】
上記課題を達成するため、本発明は、螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有し、上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納し、上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４，２４を有し、この平面部２４，２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を夫々設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設け、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配し、前記掛け外し装置４０には、両ハーフナット体２０ａ，２０ｂを螺合方向に移動させる際に、前記スプリング２１，２１の付勢力に抗して該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１，４１を介装してなる技術的手段を講じたものである。
【００１１】
それ故、本発明ハーフナット装置は、掛け外し装置４０でハーフナット体２０ａ，２０ｂを、近接する方向に移動させると、該ハーフナット体２０ａ，２０ｂと螺子棒１０とが螺合し、離れる方向に移動させるとこの螺合を外すことができ、掛け外しができる作用を呈するのは従来例と同じである。
【００１２】
そして、本発明ハーフナット装置は、スプリング２１，２１を設けて有るので、掛け外し装置４０でハーフナット体２０ａ，２０ｂを脱着方向に移動自在状態とすれば、このスプリング２１，２１の付勢力で確実に螺合が脱着される作用を呈する。すなわち、螺子棒１０とハーフナット体２０ａ，２０ｂとが一時的に噛み込んでいても、以後、螺子棒１０又はハーフナット体２０ａ，２０ｂが回動するとこの噛み込みが外れ、該スプリング２１，２１の付勢力で両者の螺合が外れるように作用するものである。
【００１３】
また、本発明ハーフナット装置は、上記スプリング２１，２１に抗することのできるスプリング４１，４１を介して、ハーフナット体２０ａ，２０ｂを螺合方向に移動させるようになしてあるので、万が一、螺子棒１０とハーフナット体２０ａ，２０ｂとが螺合に適正でない位置で、該ハーフナット体２０ａ，２０ｂを近接させても、その状態を維持して、螺子棒１０又はハーフナット体２０ａ，２０ｂのいずれか一方が回転して、螺合が可能な状態となると自動的に螺合するよう作用するものである。
【００１４】
また、本発明は、ハーフナット体２０ａ，２０ｂの間に、スペーサー２２，２２，２２，２２を設けたので、該ハーフナット体２０ａ，２０ｂは螺合する際に、最終的には両ハーフナット体２０ａ，２０ｂの内径が全ての位置で所定寸法となって、正確に螺子棒１０に螺合する状態となる作用を呈するものである。
【００１５】
次に、請求項２の発明は、螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有し、上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納し、上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４，２４を有し、この平面部２４，２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を夫々設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設け、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配し、前記掛け外し装置４０は、前記ハーフナット体２０ａ，２０ｂの外面側に軸方向に向かってその中心軸に接離方向に傾斜する楔面部２６を設け、上記螺子棒１０を中心にして移動する移動筒体４２を設け、この移動筒体４２の外周面には凹溝リング部４３を設けて、この凹溝リング部４３内には操作レバー４４の操作で螺子棒１０の略軸方向に移動する該操作レバー４４の先端部に設けた転子４９ａ，４９ａを係入させ、該移動筒体４２には、先端に上記楔面部２６に適合する楔体４５を有した一対の軸体４６，４６を螺子棒１０と平行に遊挿して取り付け、この移動筒体４２と軸体４６，４６との間には、前記スプリング２１，２１の付勢力に抗して、該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１，４１を介装してなる技術的手段を講じたものである。
【００１６】
それ故、本発明ハーフナット装置は、前記請求項１の作用に加えて、掛け外し装置４０を、操作レバー４４の回動で、移動筒体４２を螺子棒１０の略軸方向の移動に変え、さらに、楔体４５で両ハーフナット体２０ａ，２０ｂの半径方向への移動に変換しているので、力の伝動が迅速に行え、所謂ワンタッチでの掛け外しが可能となる作用を呈するものである。
【００１７】
また、上記楔体４５は、その角度を小さく設定することで、両ハーフナット体２０ａ，２０ｂよりの反力に充分抗することのできる作用を呈するものである。
【００１８】
次に、請求項３の発明は、螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有し、上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納し、上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４を有し、この平面部２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を夫々設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設け、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配し、前記掛け外し装置４０は、平行な案内レール５１，５１を有した外枠体５０が、前記枠体３０を通る該案内レール５１，５１に案内されて移動可能に保持し、この外枠体５０の一端側フランジ部５２ａからは、その先端が枠体３０を遊挿して一方のハーフナット体２０ａの外面に接する操作軸５３を、他端側フランジ部５２ｂからは、この他端側フランジ部５２ｂから案内レール５１，５１と平行方向に進退する主操作棒５４を設け、この主操作棒５４の先端は前記枠体３０内に遊挿させ、この主操作棒５４と他方のハーフナット体２０ｂの外面との間に、前記スプリング２１，２１の付勢力に抗して、該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１を介装し、さらに、この主操作棒５４の先端部には枠体３０内よりの抜止５５を設けてなる技術的手段を講じたものである。
【００１９】
それ故、本発明ハーフナット装置は、前記請求項１の作用に加えて、主操作棒５４を螺子棒１０に向けて移動させると、スプリング４１が圧縮されてスプリング２１，２１の付勢力に打ち勝って、両ハーフナット体２０ａ，２０ｂを近接方向に押し込むので、螺子棒１０との螺合位置が適合すれば自動的に螺合する作用を呈するものである。
【００２０】
なお、上記主操作棒５４の進退は、図示実施例のように螺進退とすれば、迅速な操作性には欠けるも大きな反力に抗した確実な操作が可能となる作用を呈し、従来のようなレバー操作とすれば、反力受けには工夫が必要となるも迅速な操作が可能となる作用を呈し、さらには、該主操作棒５４は直線往復運動であるのでソレノイド等による遠隔操作も可能となる作用を呈するものである。
【００２１】
【実施例】
次に、本発明の実施例を添付図面に基づいて詳細に説明する。図実施例において、本発明ハーフナット装置は、シリンダー操作弁の手動・自動切換機構に使用されており、図中、１０が図では省略したその下部が、同様に図では省略した弁本体に連設した弁操作棒を構成する螺子棒である。この螺子棒１０は図示状態で、上昇するとその下部に連結した弁本体を上昇させて開弁し、該螺子棒１０を下降すると閉弁するようになっており、通常、この螺子棒１０の昇降は、図１に示されるようなシリンダ１００（エアー駆動式シリンダ）によって行われる。すなわち、螺子棒１０の下部は螺条のない円柱部（密閉性を確保するため。）となして、この円柱部はシリンダ１００を気密を保って抜き差し可能に挿通し、さらに、シリンダ１００内ではこの円柱部がピストンを貫通し、該ピストン１０１はこの円柱部に固定されている。従って、該ピストン１０１を、シリンダ１００内で昇降することで、該螺子棒１０も昇降するようになして、弁を開閉できるようになしてある。言い換えると、上記ピストン１０１の上下に円柱部を突設し、シリンダ１００の上方に貫通した円柱部の外周に螺条を設けて螺子棒１０を構成し、シリンダ１００の下方に貫通した円柱部には図では省略した弁本体を連結してある。
【００２２】
そして、本発明ハーフナット装置は、上記螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有してなるのは従来と同じである。なお、図示例では、シリンダ１００の上にスタンド１０２を介して手動回転駆動機構１０４を搭載し、この手動回転駆動機構１０４で、上記ハーフナット体２０ａ，２０ｂを回転するようになしてある。該手動回転駆動機構１０４は、図からは必ずしも明確ではないが、ハンドル１０５を回転すると、該ハンドル１０５によって回転するベベルギヤで、後記する枠体３０が螺子棒１０の中心軸を回転中心軸として回転し、同じく後記するハーフナット体２０ａ，２０ｂが枠体３０と共に回転するようになしてある。
【００２３】
また、上記スタンド１０２内に、掛け外し装置４０が収納され、該スタンド１０２の外方に設けた操作レバー４４で、この掛け外し装置４０を操作して、ハーフナット体２０ａ，２０ｂの螺子棒１０への螺合を着脱できるようになしてある。なお、この構成の詳細は後記するものとする。
【００２４】
なお、本実施例では、通常時は、上記ハーフナット体２０ａ，２０ｂの螺子棒１０への螺合は外されており（図４の状態）、シリンダ１００で弁の開閉が自動的に行えるようになしてあり、該シリンダ１００への圧力空気回路や電気信号回路等の故障等で、手動で弁を開閉せざるを得なくなったときは、掛け外し装置４０を操作して、ハーフナット体２０ａ，２０ｂを螺子棒１０に螺合させ、手動回転駆動機構１０４を操作することで、手動で弁を開閉できるようになしているものである。
【００２５】
上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納してある。ハーフナット体２０ａ，２０ｂを螺子棒１０を間にして対設するのは従来と同じであるが、本発明では、このハーフナット体２０ａ，２０ｂと螺子棒１０とを、図３及び図４に最も明らかに示す、枠体３０内に収納して、ハーフナット体２０ａ，２０ｂを、該枠体３０に案内されて接離方向（図３及び図４の左右方向）にのみ移動可能となしている。すなわち、本実施例では、該ハーフナット体２０ａ，２０ｂは枠体３０と共に回転できるようになしてあり、ハンドル１０５を回転すると、前記もしたようにベベルギヤで枠体３０が螺子棒１０の中心軸を回転中心軸として回転し、ハーフナット体２０ａ，２０ｂが枠体３０と共に回転するようになしてあるが、無論、この実施例とは別に、このハーフナット体２０ａ，２０ｂと枠体３０とは回転しないようになし螺子棒１０側を回転するようになしてもよいものである。
【００２６】
上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４，２４を有し、この平面部２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を夫々設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設けてなる。上記螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合する構成と、螺条凹部２５と平面部２４との角部は切落部２３，２３を設けてなる構成とは前記した特許文献１にも記載された公知技術である。
【００２７】
そして、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配してある。一般的には、上記両平面部２４，２４は螺子棒１０にハーフナット体２０ａ，２０ｂを螺合した状態で両者が密接して、螺合状態の正確性を安定させるようになしてあるが、本発明では敢えて、間隔Ｌを有するように設定してある。この間隔Ｌは、上記スプリング２１，２１を装填するスペースを確保するためで、このスプリング２１，２１によって、両ハーフナット体２０ａ，２０ｂは螺合を脱着する際の確実性を確保できるものである。なお、このスプリング２１，２１は、両平面部２４，２４の対向する位置に凹部６４，６４を形成し、両凹部６４，６４間にスプリング２１を圧縮した状態で介装すればよく、このスプリング２１は、ハーフナット体２０ａ，２０ｂの両側（図３及び図４の上下側）に一対配するとよい。図３と図４とは断面の位置が同一平面ではなく、上記スプリング２１は上下中央（図３奥手前方向の中央）に設けられ、後記するスペーサー２２，２２は、このプリング２１を中間にして上下部位（図３奥手前方向部位）に夫々設けてある。
【００２８】
また、上記間隔Ｌを設けることで、該ハーフナット体２０ａ，２０ｂの螺子棒１０への螺合状態が不安定化することがあり得るので、本発明では、両平面部２４，２４を密接させる代わりに、スペーサー２２，２２，２２，２２で両ハーフナット体２０ａ，２０ｂの螺合位置関係を安定的に保持するようになしてある。このスペーサー２２，２２，２２，２２は、図示例では螺子棒２２ａとナット２２ｂとで構成され、基端部をハーフナット体２０ａ，２０ｂに螺合する螺子棒２２ａは螺進退することで、両ハーフナット体２０ａ，２０ｂの距離Ｌを調整可能とすることができるようになしてあり、前記ナット２２ｂはこの螺子棒２２ａを固定できるようになしてある。なお、このスペーサー２２，２２，２２，２２は、前記もしたように、ハーフナット体２０ａ，２０ｂの平面部２４，２４の左右上下位置に計４カ所設け、前記スプリング２１，２１は、平面部２４，２４の左右中央部に２カ所設けるとバランスがよく望ましいものである。
【００２９】
そして、本発明は、前記掛け外し装置４０には、両ハーフナット体２０ａ，２０ｂを螺合方向に移動させる際に、前記スプリング２１，２１の付勢力に抗して該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１，４１を介装してなる。すなわち、本発明では、両ハーフナット体２０ａ，２０ｂの螺合を着脱（特に着装・螺合）するには、リンク等で直接行うのではなく、スプリング４１，４１の付勢力で弾止して行うようになしてある。
【００３０】
ハーフナット体２０ａ，２０ｂと螺子棒１０との螺合適合位置は、螺子棒１０の螺条の一ピッチの距離で、唯一、一カ所である。従って、両ハーフナット体２０ａ，２０ｂの間隔を狭めて、この両ハーフナット体２０ａ，２０ｂを螺子棒１０に螺合しようとしても、偶然でない限り適正に両者が螺合することはなく、螺子棒１０の螺条の山部と両ハーフナット体２０ａ，２０ｂの内周螺条の山部とが接して、螺合できない場合のほうが多いことになる。そこで、本発明では、この両者の螺条の山と山とが接触した状態で両ハーフナット体２０ａ，２０ｂを、螺合方向に向けて付勢しておくように弾止した状態を保たせ、該螺子棒１０又はハーフナット体２０ａ，２０ｂを回転させて螺合位置が一致すると、両者が自動的に螺合するようになしてある。
【００３１】
次に、請求項２の発明は、螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有し、上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納し、上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４を有し、この平面部２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設け、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配してなるのは前記請求項１の構成と同じである。
【００３２】
そして、本発明は前記掛け外し装置４０は、前記ハーフナット体２０ａ，２０ｂの外面側に軸方向に向かってその中心軸に接離方向に傾斜する楔面部２６（図示実施例では、この楔面部２６は、図１の下方に向かって順次螺子棒１０の中心軸側に近づくよう傾斜する。）を設けてある。すなわち、本発明ではハーフナット体２０ａ，２０ｂを、該楔面部２６を使用して楔案内するものである。
【００３３】
そして、前記掛け外し装置４０として、螺子棒１０を中心にして移動する移動筒体４２を設け、この移動筒体４２の外周面には凹溝リング部４３を設けて、この凹溝リング部４３内には操作レバー４４の操作で螺子棒１０の略軸方向に移動する該操作レバー４４の先端部に設けた転子４９ａ，４９ａを係入させてある。上記移動筒体４２は、螺旋棒１０と同心状に設けられ、該螺旋棒１０の軸方向に（図１の上下方向に）移動可能となすとと共に、該螺旋棒１０の軸を回転中心軸として回転自在（枠体３０と共に回転可能）となしている。そして、この移動筒体４２を操作レバー４４で、螺旋棒１０の軸方向に移動できるようになしてあり、該操作レバー４４と移動筒体４２との連結部は、該移動筒体４２の回転を阻害しないようなすためと、揺動する操作レバー４４の先端と該移動筒体４２の連結部の変位を吸収するため、操作レバー４４の先端部に設けた転子４９ａ，４９ａを移動筒体４２の外周面に設けた凹溝リング部４３内に係入させてなるものである。
【００３４】
該移動筒体４２には、先端に上記楔面部２６に適合する楔体４５を有した一対の軸体４６，４６を螺子棒１０と平行に遊挿して取り付け、この移動筒体４２と軸体４６，４６との間には、前記スプリング２１，２１の付勢力に抗して、該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１，４１を介装してなる。すなわち、前記したハーフナット体２０ａ，２０ｂの楔面部２６は、該ハーフナット体２０ａ，２０ｂの外面側に設けられ，下方が螺旋棒１０の中心側に向かって傾斜するようになっているのに対して、移動筒体４２に設けられる上記楔体４５は、その傾斜面を楔面部２６に接するようになすのは無論で、この楔体４５は、下方が巾広で、内面側が上方に向かって螺旋棒１０の中心軸より順次遠ざかる傾斜面となしてある。
【００３５】
従って、前記移動筒体４２が、図１に示すように上昇位置にあると、軸体４６，４６も上昇位置にあって、楔体４５，４５も上昇し、両ハーフナット体２０ａ，２０ｂを近づけるように移動させる。なお、移動筒体４２と軸体４６，４６との間には、スプリング４１，４１を介装してなるので、両ハーフナット体２０ａ，２０ｂは、このスプリング４１，４１によって両者が近接する方向に押しつけられるようになっている。そして、図２に示すように、移動筒体４２が下降位置にあると、楔体４５，４５も下降し、両ハーフナット体２０ａ，２０ｂはスプリング２１，２１の付勢力で互いが離れるように位置して、螺旋棒１０との螺合を解いている状態となる。
【００３６】
上記軸体４６，４６は、その基部（下部）を移動筒体４２に遊挿し、軸体４６の下方突出部にはストッパナット４６ａを夫々螺合し、このストッパナット４６ａの位置を調整することで該軸体４６，４６の上死点及び下死点を変更できるようになしてある。また、この軸体４６，４６の移動筒体４２より上方に突出部部位にストッパー４６ｂを設け、このストッパー４６ｂと移動筒体４２の上面との間に前記スプリング４１，４１が装着されていて、移動筒体４２が上昇位置にある際は、この軸体４６，４６は該スプリング４１，４１で上方に向けて付勢されるようになしてあり、この付勢力は移動筒体４２が上死点に位置する際、楔体４５，４５と楔面部２６、２６とを介して、両ハーフナット体２０ａ，２０ｂを、スプリング２１，２１の付勢力に抗して、相互に内側に移動させることができるようになしてある。
【００３７】
なお、本願では「楔体４５を有した一対の軸体４６，４６」と記載して、軸体４６と楔体４５とが一体的であるかのように記載しているが、両者は別個に構成され、軸体４６の上昇で楔体４５を押し上げられるようになしてもよいのは無論である。
【００３８】
なお、前記移動筒体４２と操作レバー４４との連動機構を、主に、図５に基づいて説明すると、スタンド１０２を貫通して水平方向の案内筒４７が固定され、この案内筒４７内に挿入された回動軸４８の一端に操作レバー４４が連結されてなる。そして、上記案内筒４７の途中部位は分断された回動筒部４８ａとなし、この、回動筒部４８ａはピン４８ｂで回動軸４８に一体化され、操作レバー４４乃至回動軸４８と共に回動するようになしてある。そして、この回動筒部４８ａには、移動筒体４２より一回り大きく形成した半円形のアーム４９が連結され、このアーム４９は移動筒体４２を包み込むように配され、その両先端に転子４９ａ，４９ａが取り付けられ、この転子４９ａ，４９ａは凹溝リング部４３内に係入させてなる。
【００３９】
なお、上記案内筒４７の一端には、表示盤６０が固定され、この表示盤６０には、操作レバー４４の回動位置を示す、手動位置の表示６３ａと自動位置の表示６３ｂとが表示され、その各々の位置に係合欠部６２ａ，６２ｂが設けられている。そして、操作レバー４４より突設したアーム部４４ａには先端が前記係合欠部６２ａ，６２ｂに着脱可能に係合する係合ピン体５１を設けてある。
【００４０】
次ぎに、請求項３の発明は、螺子棒１０と、掛け外し装置４０でこの螺子棒１０に着脱可能に螺合するハーフナット体２０ａ，２０ｂとを有し、上記螺子棒１０の外側には枠体３０を設け、この枠体３０内には一対のハーフナット体２０ａ，２０ｂを、前記螺子棒１０を間にすると共に、該枠体３０に案内されて接離方向にのみ移動可能にして収納し、上記ハーフナット体２０ａ，２０ｂは、内側に略平行に対向する平面部２４を有し、この平面部２４の中央部位に、螺子棒１０に螺合する螺条を設けた螺条凹部２５を設け、この螺条凹部２５は螺子棒１０に螺合した状態で該螺子棒１０の半周未満で螺合して両平面部２４，２４には間隙Ｌを有するように設定すると共に、該螺条凹部２５と平面部２４との角部は切落部２３，２３を設け、上記両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂをその螺合を解く方向に付勢するスプリング２１，２１を設け、さらに、この両ハーフナット体２０ａ，２０ｂの間には、両ハーフナット体２０ａ，２０ｂの近接距離を所定に保つスペーサー２２，２２，２２，２２を四カ所以上に配してなるのは請求項１及び請求項２と同じ構成である。
【００４１】
前記掛け外し装置４０は、平行な案内レール５１，５１を有した外枠体５０が、前記枠体３０を通る該案内レール５１，５１に案内されて移動可能に保持し、この外枠体５０の一端側フランジ部５２ａからは、その先端が枠体３０を遊挿して一方のハーフナット体２０ａの外面に接する操作軸５３を、他端側フランジ部５２ｂからは、この他端側フランジ部５２ｂから案内レール５１，５１と平行方向に進退する主操作棒５４を設け、この主操作棒５４の先端は前記枠体３０内に遊挿させ、この主操作棒５４と他方のハーフナット体２０ｂの外面との間に、前記スプリング２１，２１の付勢力に抗して、該ハーフナット体２０ａ，２０ｂの距離を縮めることのできるバネ力を有したスプリング４１を介装し、さらに、この主操作棒５４の先端部には枠体３０内よりの抜止５５を設けてなる。
【００４２】
上記外枠体５０は、図７乃至図９に示すように左右一対のフランジ部５２ａ，５２ｂと、この両フランジ部５２ａ，５２ｂを連結する案内レール５１，５１とで矩形枠所に構成され、一方のフランジ部５２ａは調整螺子５６，５６で他方のフランジ部５２ｂとの間隔を一定の距離に保持している。そして、枠体３０にはその両端部に通孔３１，３１が設けられ、この通孔３１，３１内の案内レール５１，５１が抜き差し自在に挿通され、左右一対のフランジ部５２ａ，５２ａは枠体３０を中心に案内レール５１，５１により図左右方向に移動可能となしている。
【００４３】
また、上記操作軸５３と主操作棒５４とは、フランジ部５２ａ，５２ｂに螺合した状態で貫通し、操作軸５３は、固定螺子５７で、該操作軸５３の先端部を外枠体５０内に突出する量を調整可能に連結してある。また、図示では、前記主操作棒５４は外枠体５０の外方端に蝶螺子摘み部５８を連設し、指先で該主操作棒５４を螺進退することができるようになしてある。すなわち、操作軸５３と主操作棒５４との内側端は対向し主操作棒５４の螺進退でその間隔が変更できるようになしてある。
【００４４】
主操作棒５４を螺進させると、該主操作棒５４がハーフナット体２０ｂを螺子棒１０に螺合させる方向に移動し、同時にフランジ部５２ｂと連結した案内レール５１，５１によってフランジ部５２ａに固定された操作軸５３がハーフナット体２０ａを螺子棒１０に螺合させる方向に移動する。枠体３０は螺子棒１０を中心にしてスタンド１０２に回転が自由な状態で保持されており、フランジ５２ａ，５２ｂのみが図面上右側に夫々移動する。
【００４５】
そして、操作軸５３の先端は直接、一方のハーフナット体２０ａの外面に接し、主操作棒５４の先端はスプリング４１を介して他方のハーフナット体２０ｂに接触するようになしているので、該主操作棒５４を外枠体５０の内方にねじ込むと図８に示すように、両ハーフナット２０ａ，２０ｂは両者の間隔を狭め、螺子棒１０に螺合する。また、該主操作棒５４を外枠体５０の外方（図８右側）に移動させると、図９に示すように、両ハーフナット２０ａ，２０ｂは両者の間隔を広げ、螺子棒１０との螺合を脱着するものである。なお、上記両ハーフナット２０ａ，２０ｂの移動に際して外枠体５０も移動するので、主操作棒５４の先端部には枠体３０内よりの抜止５５を設けて、該主操作棒５４のみが一方的に螺進退するのを防いでいる。また、本実施例での掛け外し装置４０は、蝶螺子摘み部５８を螺進させて枠体３０に固定されたハンドル１０５ａ（図７参照）を回転させれば、自動的にハーフナット体２０ａ，２０ｂと螺子棒１０が螺合する特長を有し、ギア減速を必要としない比較的力量の少ない掛け外し装置に適するものである。
【００４６】
図７は、上記ハーフナット装置を前記と同じシリンダー弁に利用したもので、ハンドル１０５ａと枠体５０とは一体的に回動するようになしてあり、螺子棒１０の下方には、図１と同様に、シリンダ１００が連結されてなる。
【００４７】
【発明の効果】
請求項１乃至請求項３の本発明によれば、掛け外しが容易確実なハーフナット装置を提供できるもので、特に、螺合の着脱に際してスプリング２１，２１，４１，４１の付勢力を利用するようになしたので、螺合を外す場合はこのスプリング２１，２１で確実に外すことができ、螺合する場合は、操作レバー４４等の一回の操作（ワンタッチ操作）で螺合方向への操作が行え、この際に例え適切な螺合がなされていなくても、螺子棒１０又は両ハーフナット２０ａ，２０ｂの回転で自動的な螺合が担保された状態とすることができるハーフナット装置を提供できるものである。
【図面の簡単な説明】
【図１】本発明をシリンダー操作弁の手動・自動切換機構に使用した実施例での要部縦断面図である。
【図２】ハーフナットの螺合が解かれた状態での要部縦断面図である。
【図３】ハーフナット螺合部の螺合状態での横断面図である。
【図４】ハーフナット螺合部の螺合を解いた状態での横断面図である。
【図５】ハーフナットを駆動するレバー操作部の横断面図である。
【図６】操作レバーの近くに設けられる表示盤の一部の正面図である。
【図７】別の実施例での要部縦断面図である。
【図８】「図７」Ａ−Ａ線部断面図である。
【図９】「図８」のハーフナットの螺合が解かれた状態での断面図である。
【図１０】作用を説明する要部断面図である。
【符号の説明】
１０螺子棒
２０ａハーフナット体
２０ｂハーフナット体
２１スプリング
２２スペーサー
２３切落部
２４平面部
２５螺条凹部
２６楔面部
３０枠体
４０掛け外し装置
４１スプリング
４２移動筒体
４３凹溝リング部
４４操作レバー
４５楔体
４６軸体
４９ａ転子
５１案内レール
５２ａ一端側フランジ部
５２ｂ他端側フランジ部
５３操作軸
５４主操作棒
５５抜止[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a half nut device (also referred to as a split nut device).
[0002]
[Prior art]
Conventionally, a half nut device is generally used for hanging and unscrewing of a lathe or the like, and a pair of half nut bodies having a screw bar interposed therebetween are moved in a contact / separation direction by a cam or the like provided on a handle. When the distance between the nut bodies is reduced, the two half nut bodies are screwed into the screw rod, and when the distance between the two is widened, the screw is disengaged. When both are screwed together, either the screw rod or the half nut body When one is fixed and the other is rotated, one side is made to advance and retreat, and when the two half nuts are unthreaded, the other side is rotated so that it does not advance and retreat. Are also disclosed in “Patent Document 1” and “Non-Patent Document 1”.
[0003]
However, this type of half-nut device requires a surprisingly large distance to move the two half-nuts in the direction of contact and separation for hooking and removing, so that the drive mechanism of the two half-nuts becomes large or difficult to operate. There is a problem that it takes time. Therefore, in order to avoid this problem, each half nut body is not accurately divided into two parts, but smaller than two divided parts, in other words, formed to be smaller than exactly half, and screwed together in less than half the circumference of the screw rod. In this way, although the screwing area is reduced, it is common that the screwing area can be detached even if the moving distance is short, and this technique is illustrated in "Non-Patent Document 1".
[0004]
Further, as disclosed in FIG. 3 of Patent Document 1, the screwing portion between the half nut body and the screw rod is set to be less than half a circumference of the screw rod, and the half nut body is viewed from a plane. There has also been proposed a method in which both ends of a threaded portion are scraped off so that the thread can be detached even if the moving distance is small.
[0005]
As shown in FIG. 10, when the half nut bodies 20a and 20b are accurate two-part nuts on the left side in the figure, the movement distance of the half nut bodies 20a and 20b to which the screwing can be attached and detached (half) The moving distance B1 / 2 shown on the upper and lower sides of FIG. 10 is necessary for the moving distance of one side of the nut bodies 20a and 20b), whereas (CA) / 2 may be used in the example shown on the right side of FIG. From the drawing, it is apparent at a glance that B1 / 2> (CA) / 2.
[0006]
According to the conventional example as described above, even if the moving distance of the half nut body is small, it is possible to remove the half nut body.However, it is said that timing is required for attaching and detaching the screwing between the half nut body and the screw rod, When the screw bar and the half nut body are engaged, the attachment and detachment may not be possible, and the thread of the thread of the screw bar and the thread of the inner peripheral thread of the half nut overlap and both are qualified. In general, while rotating either the half nut body or the screw rod, the half nut body is manually moved in the radial direction so that the worker can attach and detach the screw. However, there is a problem that quick disconnection is difficult.
[0007]
In addition, this type of half-nut device has a problem of a distance between operation parts and a force required at the time of operation when switching the opening and closing operation of a large valve between automatic and manual as in the illustrated embodiment. Due to a problem or the like, there is a demand that both the half nut and the screw rod are securely removed in a stopped state, and the conventional example is not completely satisfactory.
[0008]
[Patent Document 1]
JP-A-9-42517 (FIG. 3)
[Non-patent document 1]
Edited by Banai, edited by MECHANISM, Gihodo Publishing Co., Ltd., published on November 30, 1955. 355 35
[0009]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and needs, and has as its object to provide a half nut device that can be easily and reliably detached with one touch.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a screw rod 10 and half nut bodies 20a and 20b which are detachably screwed to the screw rod 10 by a hooking / unlocking device 40. Is provided with a frame 30, in which a pair of half nut bodies 20a and 20b are guided by the frame 30 so as to be movable only in the contact and separation directions with the screw rod 10 therebetween. The half nut bodies 20a, 20b have flat portions 24, 24 facing substantially in parallel on the inside, and a screw thread to be screwed to the screw rod 10 is provided at a central portion of the flat portions 24, 24. The screw recesses 25 are provided respectively, and the screw recesses 25 are screwed to the screw rod 10 in a state of being screwed less than half a circumference of the screw rod 10 so as to have a gap L between the two flat portions 24, 24. And the corner between the thread recess 25 and the plane portion 24 is Drops 23, 23 are provided, and springs 21, 21 are provided between the two half nut bodies 20a, 20b to urge the two half nut bodies 20a, 20b in the direction of unscrewing. Between the half nut bodies 20a and 20b, spacers 22, 22, 22, 22 that maintain a predetermined distance between the two half nut bodies 20a and 20b are arranged at four or more places. When the half nut bodies 20a and 20b are moved in the screwing direction, the spring 41 having a spring force capable of shortening the distance between the half nut bodies 20a and 20b against the urging force of the springs 21 and 21. In this case, technical means including the intermediary 41 are taken.
[0011]
Therefore, in the half nut device of the present invention, when the half nut members 20a and 20b are moved in the approaching direction by the hanging-off device 40, the half nut members 20a and 20b and the screw rod 10 are screwed and separated from each other. The screw engagement can be released by moving to the position shown in FIG.
[0012]
Since the half nut device of the present invention is provided with the springs 21 and 21, if the half nut bodies 20 a and 20 b are made movable in the detaching direction by the hooking / unloading device 40, the biasing force of the springs 21 and 21 is used. It has the effect that the screwing is securely removed. That is, even if the screw rod 10 and the half nut bodies 20a, 20b are temporarily engaged, the engagement is released when the screw rod 10 or the half nut bodies 20a, 20b rotate thereafter, and the springs 21, 21 are disengaged. With the urging force described above, the two screws are disengaged from each other.
[0013]
Also, the half nut device of the present invention moves the half nut bodies 20a, 20b in the screwing direction via the springs 41, 41 that can withstand the springs 21, 21. Even if the screw nut 10 and the half nut members 20a, 20b are brought close to each other at a position where the screw nut 10 is not suitable for screwing, the state is maintained and the screw rod 10 or the half nut members 20a, 20b are maintained. When one of them rotates to be in a state in which the screw can be engaged, the screw is automatically engaged.
[0014]
In addition, according to the present invention, since the spacers 22, 22, 22, 22 are provided between the half nut bodies 20a, 20b, when the half nut bodies 20a, 20b are screwed together, the two half nuts are finally provided. The inner diameters of the bodies 20a and 20b have predetermined dimensions at all positions, and have an effect of being accurately screwed into the screw rod 10.
[0015]
Next, the invention according to claim 2 has a screw rod 10 and half nut bodies 20a and 20b which are detachably screwed to the screw rod 10 by a hooking / unloading device 40. A frame body 30 is provided, and a pair of half nut bodies 20a and 20b are provided in the frame body 30 with the screw rod 10 interposed therebetween and guided by the frame body 30 so as to be movable only in the contact and separation directions. The half nut bodies 20a, 20b are housed, and have flat portions 24, 24 facing in parallel substantially inward, and a screw thread to be screwed to the screw rod 10 is provided at a central portion of the flat portions 24, 24. The threaded recesses 25 are screwed less than half the circumference of the threaded rod 10 in a state of being threadedly engaged with the threaded rod 10 so as to have a gap L between the two flat portions 24, 24. At the same time, the corner between the screw recess 25 and the plane portion 24 is cut off 23 23, springs 21 and 21 are provided between the two half nut bodies 20a and 20b to urge the two half nut bodies 20a and 20b in the direction of unscrewing the two half nut bodies 20a and 20b. , 20b, spacers 22,22,22,22 for keeping the distance between the two half nut bodies 20a, 20b at a predetermined value are arranged at four or more places, and the unlatching device 40 is provided with the half nut bodies 20a, 20b. A wedge surface portion 26 is provided on the outer surface side of the outer surface 20b so as to be inclined toward and away from the center axis thereof in the axial direction, and a movable cylinder 42 that moves about the screw rod 10 is provided. A grooved ring portion 43 is provided on the surface, and a trochanter 49a provided at a distal end portion of the operation lever 44 that moves in the substantially axial direction of the screw rod 10 by operating the operation lever 44 in the grooved ring portion 43. , 49 And a pair of shafts 46, 46 having a wedge body 45 at the distal end, which fits the wedge surface portion 26, are attached to the movable cylinder 42 by loosely inserting the same in parallel with the screw rod 10. Springs 41, 41 having a spring force capable of reducing the distance between the half nut bodies 20a, 20b between the body 42 and the shaft bodies 46, 46 against the urging force of the springs 21, 21. The technical means which interposed was taken.
[0016]
Therefore, the half nut device of the present invention, in addition to the function of the above-described claim 1, changes the hanging / unloading device 40 to the movement of the movable cylinder 42 in the substantially axial direction of the screw rod 10 by the rotation of the operation lever 44. Further, since the movement of the two half nuts 20a, 20b in the radial direction is converted by the wedge body 45, the transmission of the force can be performed quickly, and the function of enabling the so-called one-touch detachment is possible. is there.
[0017]
Further, the wedge body 45 exhibits an effect of sufficiently resisting the reaction force from both half nut bodies 20a and 20b by setting the angle to be small.
[0018]
Next, the invention according to claim 3 has a screw rod 10 and half nut bodies 20a and 20b which are detachably screwed to the screw rod 10 by a hooking / unloading device 40. A frame body 30 is provided, and a pair of half nut bodies 20a and 20b are provided in the frame body 30 with the screw rod 10 interposed therebetween and guided by the frame body 30 so as to be movable only in the contact and separation directions. The half nut bodies 20a and 20b are housed, and have a flat portion 24 facing the inside substantially in parallel, and a screw recess provided with a screw screwed to the screw rod 10 at a central portion of the flat portion 24. The screw recess 25 is screwed to the screw rod 10 in less than half a circumference of the screw rod 10 so as to have a gap L between the two flat portions 24, 24. Cut-off portions 23 are provided at the corners between the screw recess 25 and the flat portion 24. Springs 21 and 21 are provided between the two half nut bodies 20a and 20b to urge the two half nut bodies 20a and 20b in the direction of unscrewing the two half nut bodies 20a and 20b. , Spacers 22,22,22,22 for keeping the distance between the two half nut bodies 20a, 20b at a predetermined value are arranged at four or more places, and the hanging-out device 40 has parallel guide rails 51,51. An outer frame body 50 is movably held by being guided by the guide rails 51, 51 passing through the frame body 30. The front end of the outer frame body 50 from the one end side flange portion 52a plays the frame body 30. The main operation of inserting the operating shaft 53 that is in contact with the outer surface of one half nut body 20a from the other end side flange portion 52b, and advances and retreats from the other end side flange portion 52b in a direction parallel to the guide rails 51, 51. 54, the tip of the main operation rod 54 is loosely inserted into the frame 30, and the urging force of the springs 21, 21 is applied between the main operation rod 54 and the outer surface of the other half nut body 20b. A spring 41 having a spring force capable of shortening the distance between the half nut bodies 20a and 20b is interposed, and the tip of the main operation rod 54 is provided with a stopper 55 from the inside of the frame 30. The technical measures that are provided are taken.
[0019]
Therefore, in the half nut device of the present invention, in addition to the operation of the first aspect, when the main operation rod 54 is moved toward the screw rod 10, the spring 41 is compressed and overcomes the urging force of the springs 21 and 21. Since the two half nut bodies 20a and 20b are pushed in the approaching direction, if the screwing position with the screw rod 10 is matched, the screwing action is automatically performed.
[0020]
In addition, if the main operation rod 54 is advanced and retracted by screwing forward and backward as shown in the illustrated embodiment, it has a function that lacks quick operability but enables a reliable operation against a large reaction force. With such a lever operation, the reaction force receiving device requires an ingenuity, but has an effect of enabling quick operation. Further, since the main operation rod 54 is a linear reciprocating motion, remote operation by a solenoid or the like is performed. Also exhibit a possible function.
[0021]
【Example】
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the illustrated embodiment, the half nut device of the present invention is used for a manual / automatic switching mechanism of a cylinder operating valve. In the figure, reference numeral 10 is omitted in the figure, and the lower part thereof is connected to a valve body also omitted in the figure. It is a screw rod which constitutes the provided valve operation rod. In the illustrated state, when the screw rod 10 is raised, the valve body connected to the lower part of the screw rod 10 is raised to open the valve, and when the screw rod 10 is lowered, the valve is closed. Is performed by a cylinder 100 (air-driven cylinder) as shown in FIG. In other words, the lower portion of the screw rod 10 is formed as a cylindrical portion having no thread (to ensure airtightness), and this cylindrical portion is inserted through the cylinder 100 in an airtight manner while keeping the airtightness. The column penetrates the piston, and the piston 101 is fixed to the column. Therefore, when the piston 101 is moved up and down in the cylinder 100, the screw rod 10 is also moved up and down, so that the valve can be opened and closed. In other words, a cylindrical portion protrudes above and below the piston 101, and a thread is provided on the outer periphery of the cylindrical portion penetrating above the cylinder 100 to form the screw rod 10, and the cylindrical portion penetrating below the cylinder 100 is formed. Is connected to a valve body not shown in the figure.
[0022]
The half nut device of the present invention includes the screw bar 10 and the half nut bodies 20a and 20b which are detachably screwed to the screw bar 10 by the hanging device 40, which is the same as the conventional one. . In the illustrated example, a manual rotation drive mechanism 104 is mounted on the cylinder 100 via a stand 102, and the manual rotation drive mechanism 104 rotates the half nut bodies 20a and 20b. The manual rotation drive mechanism 104 is a bevel gear that is rotated by the handle 105 when the handle 105 is rotated, although not necessarily clear from the figure, and the frame 30 described later rotates about the center axis of the screw rod 10 as the rotation center axis. The half nut bodies 20a and 20b described later also rotate together with the frame 30.
[0023]
Further, the hanging device 40 is accommodated in the stand 102, and the operation lever 44 provided outside the stand 102 is used to operate the hanging device 40, and the screw rods 10 of the half nut bodies 20a and 20b are moved. It is made to be able to attach and detach the screw. The details of this configuration will be described later.
[0024]
In this embodiment, the screwing of the half nut bodies 20a and 20b to the screw rod 10 is normally removed (the state shown in FIG. 4) so that the cylinder 100 can automatically open and close the valve. If it is necessary to manually open and close the valve due to a failure of the pressure air circuit or the electric signal circuit to the cylinder 100, etc., the unclamping device 40 is operated to operate the half nut body 20a. , 20b are screwed into the screw rod 10 and the valve can be manually opened and closed by operating the manual rotation drive mechanism 104.
[0025]
A frame 30 is provided outside the screw rod 10, and a pair of half nut bodies 20 a and 20 b are provided inside the frame 30 with the screw rod 10 interposed therebetween and guided by the frame 30. It is stored so that it can be moved only in the separating direction. Although the half nut bodies 20a and 20b are opposed to each other with the screw rod 10 therebetween, in the present invention, the half nut bodies 20a and 20b and the screw rod 10 are shown in FIGS. The half nut bodies 20a and 20b are housed in the frame 30 as shown most clearly, and can be moved only in the contact and separation directions (left and right directions in FIGS. 3 and 4) guided by the frame 30. I have. That is, in the present embodiment, the half nut bodies 20a and 20b are configured to be rotatable together with the frame body 30. When the handle 105 is rotated, the frame body 30 is rotated by the bevel gear as described above. Is rotated about the rotation center axis, and the half nut bodies 20a and 20b rotate together with the frame body 30. Of course, apart from this embodiment, the half nut bodies 20a and 20b and the frame body 30 The screw rod 10 may be rotated so as not to rotate.
[0026]
The half nut bodies 20a, 20b have flat portions 24, 24 facing substantially parallel to each other on the inner side, and a screw recess 25 provided with a screw screwed to the screw rod 10 at a central portion of the flat portion 24. The screw concave portion 25 is screwed to the screw rod 10 in a state of being screwed less than half a circumference of the screw rod 10 so as to have a gap L between the two flat portions 24 and 24. The corners between the screw recess 25 and the plane portion 24 are provided with cutouts 23,23. The screw recess 25 is screwed onto the screw rod 10 in a state of being screwed less than half a circumference of the screw rod 10, and the screw recess 25 and the flat portion 24 are provided with cutouts 23, 23 at the corners. This configuration is a known technique described in Patent Document 1 described above.
[0027]
Further, springs 21 and 21 are provided between the two half nut bodies 20a and 20b to urge the two half nut bodies 20a and 20b in the direction of unscrewing the two half nut bodies 20a and 20b. Between them, spacers 22, 22, 22, 22 for maintaining a predetermined close distance between the two half nut bodies 20a, 20b are arranged at four or more places. Generally, the two flat portions 24, 24 are tightly fitted in a state where the half nut bodies 20a, 20b are screwed to the screw rod 10, thereby stabilizing the accuracy of the screwed state. In the present invention, the distance L is set. The interval L is for securing a space for loading the springs 21 and 21, and the springs 21 and 21 can ensure the reliability of the two half nut bodies 20a and 20b when the screw engagement is removed. . The springs 21, 21 may be formed by forming recesses 64, 64 at positions opposing the flat portions 24, 24, and interposing the springs 21 in a compressed state between the recesses 64, 64. It is preferable to arrange a pair of 21 on both sides (upper and lower sides in FIGS. 3 and 4) of the half nut bodies 20a and 20b. 3 and FIG. 4, the cross-sectional position is not the same plane, and the spring 21 is provided at the upper and lower center (the center in the front-rear direction in FIG. 3). It is provided at each of the upper and lower parts (parts in the frontward direction in FIG. 3).
[0028]
Further, by providing the space L, the screwing state of the half nut bodies 20a, 20b to the screw rod 10 may be destabilized. Therefore, in the present invention, the two flat portions 24, 24 are brought into close contact with each other. Instead, the spacers 22, 22, 22, 22 are adapted to stably maintain the threaded positional relationship between the two half nut bodies 20a, 20b. In the illustrated example, the spacers 22, 22, 22, 22 are configured by a screw rod 22a and a nut 22b, and the screw rod 22a whose base end is screwed into the half nut bodies 20a, 20b is advanced and retracted. The distance L between the half nut bodies 20a and 20b can be adjusted, and the nut 22b can fix the screw rod 22a. As described above, the spacers 22, 22, 22, 22 are provided at a total of four positions on the right and left and up and down of the flat portions 24, 24 of the half nut bodies 20a, 20b. It is desirable to provide two places at the left and right central portions of the 24, 24 for good balance.
[0029]
In the present invention, when the two half nut bodies 20a and 20b are moved in the screwing direction, the half nut bodies 20a and 20b are opposed to the urging force of the springs 21 and 21. Are provided with springs 41, 41 having a spring force capable of reducing the distance. In other words, in the present invention, the screwing of the two half nut bodies 20a, 20b is not performed directly by a link or the like, but is performed by the elastic force of the springs 41, 41 instead of directly by a link or the like. I am doing it.
[0030]
The screw fitting position between the half nut bodies 20a and 20b and the screw rod 10 is only one position at a distance of one pitch of the thread of the screw rod 10. Therefore, even if the distance between the two half nut bodies 20a and 20b is reduced and the two half nut bodies 20a and 20b are screwed into the screw rod 10, they are not properly screwed together unless accidental. In many cases, the ridges of the ten threads and the ridges of the inner peripheral threads of both half nut bodies 20a and 20b are in contact with each other and cannot be screwed together. Therefore, in the present invention, in a state where the ridges of the two threads are in contact with each other, the two half nut bodies 20a, 20b are kept in a state of being stopped so as to be urged in the screwing direction. When the screw rod 10 or the half nut bodies 20a and 20b are rotated to match the screw positions, the two are automatically screwed together.
[0031]
Next, the invention according to claim 2 has a screw rod 10 and half nut bodies 20a and 20b which are detachably screwed to the screw rod 10 by a hooking / unloading device 40. A frame body 30 is provided, and a pair of half nut bodies 20a and 20b are provided in the frame body 30 with the screw rod 10 interposed therebetween and guided by the frame body 30 so as to be movable only in the contact and separation directions. The half nut bodies 20a and 20b are housed, and have a flat portion 24 facing the inside substantially in parallel, and a screw recess provided with a screw screwed to the screw rod 10 at a central portion of the flat portion 24. 25, the screw recess 25 is screwed to the screw rod 10 in a state of being screwed less than half a circumference of the screw rod 10 so that both flat portions 24, 24 are set to have a gap L. Cut-off portions 23 are provided at the corners between the screw recess 25 and the flat portion 24, and Between the two half nut bodies 20a and 20b, springs 21 and 21 for urging the two half nut bodies 20a and 20b in the direction of unscrewing are provided, and between the two half nut bodies 20a and 20b. The spacers 22, 22, 22, 22 for keeping the distance between the two half nut bodies 20a, 20b at a predetermined value are arranged in four or more places, which is the same as the configuration of the first aspect.
[0032]
Further, in the present invention, the hanging-off device 40 includes a wedge surface portion 26 (in the illustrated embodiment, this wedge surface portion is inclined on the outer surface side of the half nut bodies 20a, 20b in the axial direction toward and away from the center axis thereof). 26 inclines so as to gradually approach the central axis side of the screw rod 10 downward in FIG. 1). That is, in the present invention, the half nut bodies 20a and 20b are wedge-guided using the wedge surface portion 26.
[0033]
A moving cylinder 42 that moves around the screw rod 10 is provided as the hanging device 40, and a groove groove 43 is provided on the outer peripheral surface of the moving cylinder 42. The trochanters 49a, 49a provided at the distal end of the operation lever 44, which are moved substantially in the axial direction of the screw rod 10 by operating the operation lever 44, are engaged therein. The movable cylinder 42 is provided concentrically with the spiral rod 10 and is movable in the axial direction of the spiral rod 10 (in the vertical direction in FIG. 1), and the axis of the spiral rod 10 is set at the rotation center axis. (Rotatable with the frame 30). The movable cylinder 42 can be moved in the axial direction of the spiral rod 10 by an operation lever 44, and the connecting portion between the operation lever 44 and the movable cylinder 42 is rotated by the rotation of the movable cylinder 42. In order not to obstruct the movement and to absorb the displacement of the connecting portion between the tip of the swinging operation lever 44 and the movable cylinder 42, the trochanters 49a, 49a provided at the tip of the operation lever 44 are moved by the movable cylinder. 42 is engaged in a concave groove ring portion 43 provided on the outer peripheral surface.
[0034]
A pair of shafts 46, 46 having a wedge body 45 at the distal end, which fits the wedge surface portion 26, are attached to the movable cylinder 42 by loosely inserting the movable cylinder 42 in parallel with the screw rod 10. The springs 41, 41 having a spring force capable of reducing the distance between the half nut bodies 20a, 20b against the biasing force of the springs 21, 21 are interposed between the springs 41, 46. Become. That is, the wedge surface portions 26 of the half nut bodies 20a, 20b are provided on the outer surface side of the half nut bodies 20a, 20b, and the lower part is inclined toward the center of the spiral rod 10. On the other hand, it is a matter of course that the wedge body 45 provided on the movable cylindrical body 42 has its inclined surface in contact with the wedge surface portion 26, and the wedge body 45 is wide at the lower side and upward at the inner side. The spiral rod 10 has an inclined surface that gradually moves away from the central axis of the spiral rod 10.
[0035]
Therefore, when the movable cylinder 42 is in the raised position as shown in FIG. 1, the shafts 46, 46 are also in the raised position, the wedges 45, 45 are also raised, and the two half nut bodies 20a, 20b are moved. Move them closer. Since the springs 41, 41 are interposed between the movable cylinder 42 and the shafts 46, 46, the two half-nut bodies 20a, 20b are moved in the direction in which they come close by the springs 41, 41. To be pressed against. Then, as shown in FIG. 2, when the movable cylinder 42 is at the lowered position, the wedges 45, 45 are also lowered, and the two half nut bodies 20a, 20b are separated from each other by the urging force of the springs 21, 21. And the screw with the spiral rod 10 is released.
[0036]
The bases (lower portions) of the shafts 46, 46 are loosely inserted into the movable cylinder 42, and stopper nuts 46a are screwed into lower protruding portions of the shafts 46, respectively, to adjust the positions of the stopper nuts 46a. The upper and lower dead centers of the shafts 46, 46 can be changed. Further, a stopper 46b is provided at a protruding portion of the shafts 46, 46 above the movable cylinder 42, and the springs 41, 41 are mounted between the stopper 46b and the upper surface of the movable cylinder 42, When the movable cylinder 42 is in the raised position, the shafts 46, 46 are urged upward by the springs 41, 41. When located at a point, the two half nut bodies 20a, 20b are moved inward each other via the wedge bodies 45, 45 and the wedge surface portions 26, 26 against the urging force of the springs 21, 21. It is possible to do.
[0037]
In the present application, “a pair of shafts 46, 46 having a wedge body 45” is described as if the shaft body 46 and the wedge body 45 are integrated, but both are separate. It is needless to say that the wedge body 45 may be pushed up by raising the shaft body 46.
[0038]
The interlocking mechanism between the movable cylinder 42 and the operation lever 44 will be mainly described with reference to FIG. 5. A horizontal guide cylinder 47 penetrates the stand 102 and is fixed inside the guide cylinder 47. The operating lever 44 is connected to one end of the inserted rotating shaft 48. An intermediate portion of the guide cylinder 47 is formed as a divided rotating cylinder 48a, and the rotating cylinder 48a is integrated with the rotating shaft 48 by a pin 48b, and together with the operation lever 44 to the rotating shaft 48. It is designed to rotate. A semicircular arm 49, which is slightly larger than the movable cylinder 42, is connected to the rotating cylinder 48a. The arm 49 is disposed so as to wrap the movable cylinder 42, and is turned to both ends. Rollers 49a, 49a are attached, and the trochanters 49a, 49a are engaged in the concave groove ring portion 43.
[0039]
A display panel 60 is fixed to one end of the guide cylinder 47. The display panel 60 displays a manual position display 63a and an automatic position display 63b indicating the rotation position of the operation lever 44. , Respectively, are provided with engagement notches 62a, 62b. An arm 44a protruding from the operation lever 44 is provided with an engagement pin 51 whose tip is detachably engaged with the engagement notches 62a and 62b.
[0040]
Next, the invention of claim 3 includes a screw rod 10 and half nut bodies 20a and 20b which are detachably screwed to the screw rod 10 by a hooking / unloading device 40. A frame body 30 is provided, and a pair of half nut bodies 20a and 20b are provided in the frame body 30 with the screw rod 10 interposed therebetween and guided by the frame body 30 so as to be movable only in the contact and separation directions. The half nut bodies 20a and 20b are housed, and have a flat portion 24 facing the inside substantially in parallel, and a screw recess provided with a screw screwed to the screw rod 10 at a central portion of the flat portion 24. 25, the screw recess 25 is screwed to the screw rod 10 in a state of being screwed less than half a circumference of the screw rod 10 so that both flat portions 24, 24 are set to have a gap L. The corners between the screw recess 25 and the plane portion 24 are provided with cutouts 23, 23, Between the two half nut bodies 20a and 20b, springs 21 and 21 for urging the two half nut bodies 20a and 20b in the direction of unscrewing are provided, and further, between the two half nut bodies 20a and 20b. In this embodiment, spacers 22, 22, 22, 22 for keeping the distance between the two half nut bodies 20a, 20b at a predetermined value are arranged at four or more locations, which is the same configuration as the first and second aspects.
[0041]
The hanging device 40 holds an outer frame 50 having parallel guide rails 51 and 51 movably guided by the guide rails 51 and 51 passing through the frame 30. From one end side flange portion 52a, the operating shaft 53 whose front end is loosely inserted into the frame body 30 and comes into contact with the outer surface of one half nut body 20a is moved from the other end side flange portion 52b to the other end side flange portion 52b. A main operating rod 54 is provided which advances and retreats in a direction parallel to the guide rails 51, 51. The tip of the main operating rod 54 is loosely inserted into the frame 30, and the main operating rod 54 and the other half nut body 20b are A spring 41 having a spring force capable of reducing the distance between the half nut bodies 20a and 20b against the urging force of the springs 21 and 21 is interposed between the outer surface and the outer surface. Tip of rod 54 Formed by providing a retaining 55 than the frame 30 within the.
[0042]
As shown in FIGS. 7 to 9, the outer frame body 50 is formed in a rectangular frame by a pair of left and right flange portions 52a, 52b and guide rails 51, 51 connecting the two flange portions 52a, 52b. One of the flange portions 52a is maintained at a fixed distance from the other flange portion 52b by adjusting screws 56, 56. The frame body 30 is provided with through holes 31, 31 at both ends thereof, and guide rails 51, 51 in the through holes 31, 31 are removably inserted into the frame body 30, and a pair of left and right flange portions 52a, 52a are formed by a frame. The guide rails 51, 51 can move in the left-right direction in the figure around the body 30.
[0043]
The operation shaft 53 and the main operation rod 54 penetrate while being screwed to the flange portions 52a and 52b, and the operation shaft 53 is fixed with a fixing screw 57 so that the distal end of the operation shaft 53 is connected to the outer frame body 50. The amount projecting into is connected in an adjustable manner. In the drawing, the main operation rod 54 is provided with a thumbscrew knob 58 at the outer end of the outer frame 50 so that the main operation rod 54 can be advanced and retracted with a fingertip. That is, the inner ends of the operation shaft 53 and the main operation rod 54 are opposed to each other, and the distance between the main operation rod 54 and the main operation rod 54 can be changed by screwing and retreating.
[0044]
When the main operation rod 54 is screwed forward, the main operation rod 54 moves in a direction in which the half nut body 20b is screwed into the screw rod 10, and at the same time, the main operation rod 54 is moved to the flange 52a by the guide rails 51 and 51 connected to the flange 52b. The fixed operation shaft 53 moves in a direction in which the half nut body 20a is screwed into the screw rod 10. The frame 30 is held by the stand 102 around the screw rod 10 in a freely rotatable state, and only the flanges 52a and 52b move to the right in the drawing.
[0045]
The tip of the operating shaft 53 directly contacts the outer surface of one half nut body 20a, and the tip of the main operating rod 54 comes into contact with the other half nut body 20b via the spring 41. When the main operation rod 54 is screwed into the outer frame body 50, the gap between the two half nuts 20 a and 20 b is narrowed as shown in FIG. When the main operation rod 54 is moved to the outside of the outer frame body 50 (the right side in FIG. 8), as shown in FIG. 9, the two half nuts 20a and 20b widen the interval between them, and Detach the screw. Since the outer frame 50 also moves when the two half nuts 20a and 20b move, a stopper 55 is provided at the tip of the main operation rod 54 from inside the frame 30 so that only the main operation rod 54 has one end. To prevent the screw from retreating. In addition, if the handle 105a (see FIG. 7) fixed to the frame 30 is rotated by screwing the thumbscrew knob 58 in the present embodiment, the half-nut body 20a , 20b and the threaded rod 10 are screwed together, and are suitable for a detaching / removing device that does not require gear reduction and has a relatively small force.
[0046]
FIG. 7 shows a case in which the above half nut device is used for the same cylinder valve as described above. The handle 105a and the frame body 50 are configured to rotate integrally, and below the screw rod 10, FIG. Similarly, the cylinder 100 is connected.
[0047]
【The invention's effect】
According to the first to third aspects of the present invention, it is possible to provide a half nut device that can be easily detached and secured. In particular, the urging force of the springs 21, 21, 41, 41 is used when screwing in and out. Since the springs 21 and 21 can be securely removed when unscrewing, the operation can be performed by a single operation (one-touch operation) of the operation lever 44 or the like. A half-nut device that can be operated, and in this case, even if the proper screwing is not performed, the screw thread 10 or the rotation of the two half-nuts 20a, 20b can automatically secure the screwing. Can be provided.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a main part of an embodiment in which the present invention is used for a manual / automatic switching mechanism of a cylinder operation valve.
FIG. 2 is a vertical sectional view of a main part in a state where a half nut is unthreaded.
FIG. 3 is a cross-sectional view of a half nut screwed portion in a screwed state.
FIG. 4 is a cross-sectional view in a state where the screwing of a half nut screwing portion is released.
FIG. 5 is a cross-sectional view of a lever operation unit that drives a half nut.
FIG. 6 is a front view of a part of a display panel provided near an operation lever.
FIG. 7 is a longitudinal sectional view of a main part in another embodiment.
FIG. 8 is a sectional view taken along line AA of FIG. 7;
9 is a cross-sectional view of the half nut in FIG. 8 in a state where the half nut is unthreaded.
FIG. 10 is a cross-sectional view of a main part for explaining an operation.
[Explanation of symbols]
10 Screw rod
20a Half nut body
20b Half nut body
21 Spring
22 Spacer
23 Cut-off
24 flat part
25 thread recess
26 wedge surface
30 frame
40 Hanging device
41 Spring
42 Moving cylinder
43 Groove ring
44 Operation lever
45 wedge
46 shaft
49a trochanter
51 Guide rail
52a One end side flange
52b Flange at the other end
53 Operation axis
54 Main control rod
55 Withdrawal

Claims

A screw nut (10), and a half nut body (20a, 20b) which is detachably screwed to the screw rod (10) by a hooking-off device (40);
A frame body (30) is provided outside the screw rod (10), and a pair of half nut bodies (20a, 20b) are provided inside the frame body (30) with the screw rod (10) interposed therebetween. Being guided by the frame body (30) and movable only in the contact / separation direction, and stored;
The half nut body (20a, 20b) has a flat portion (24, 24) facing substantially parallel inside, and is screwed to a screw rod (10) at a central portion of the flat portion (24, 24). The screw recesses (25) are provided with screw threads, and the screw recesses (25) are screwed less than half the circumference of the screw rod (10) in a state of being screwed to the screw rod (10). The flat portions (24, 24) are set so as to have a gap (L), and the corners between the thread concave portion (25) and the flat portion (24) are provided with cutout portions (23, 23).
A spring (21, 21) is provided between the two half nut bodies (20a, 20b) to bias the two half nut bodies (20a, 20b) in the direction of unscrewing the two half nut bodies. Between the bodies (20a, 20b), spacers (22, 22, 22, 22) for keeping a predetermined distance between the two half nut bodies (20a, 20b) at four or more places,
When the two half nut bodies (20a, 20b) are moved in the screwing direction, the half nut body (20a, 20a, 20a, 20b) resists the urging force of the springs (21, 21). A half nut device comprising springs (41, 41) having a spring force capable of shortening the distance of 20b).

A screw nut (10), and a half nut body (20a, 20b) which is detachably screwed to the screw rod (10) by a hooking-off device (40);
A frame body (30) is provided outside the screw rod (10), and a pair of half nut bodies (20a, 20b) are provided inside the frame body (30) with the screw rod (10) interposed therebetween. Being guided by the frame body (30) and movable only in the contact / separation direction, and stored;
The half nut body (20a, 20b) has a flat portion (24, 24) facing substantially parallel inside, and is screwed to a screw rod (10) at a central portion of the flat portion (24, 24). The screw recesses (25) are provided with screw threads, and the screw recesses (25) are screwed less than half the circumference of the screw rod (10) in a state of being screwed to the screw rod (10). The flat portions (24, 24) are set so as to have a gap (L), and the corners between the thread concave portion (25) and the flat portion (24) are provided with cutout portions (23, 23).
A spring (21, 21) is provided between the two half nut bodies (20a, 20b) to bias the two half nut bodies (20a, 20b) in the direction of unscrewing the two half nut bodies. Between the bodies (20a, 20b), spacers (22, 22, 22, 22) for keeping a predetermined distance between the two half nut bodies (20a, 20b) at four or more places,
The hanging-off device (40) is provided with a wedge surface (26) which is inclined toward the axial direction in the axial direction on the outer surface side of the half nut body (20a, 20b), and is provided with the screw rod (10). ) Is provided with a movable cylinder (42) that moves around the center of the movable cylinder, and a groove groove (43) is provided on the outer peripheral surface of the movable cylinder (42). The trochanters (49a, 49a) provided at the distal end of the operation lever (44), which move in the substantially axial direction of the screw rod (10) by operating the operation lever (44), are engaged,
A pair of shafts (46, 46) each having a wedge body (45) at the distal end thereof, which fits the wedge surface (26), is loosely inserted into the movable cylindrical body (42) in parallel with the screw rod (10). The half nut body (20a, 20b) is mounted between the movable cylinder body (42) and the shaft body (46, 46) against the urging force of the springs (21, 21). A half-nut device in which springs (41, 41) having a contractible spring force are interposed.

A screw nut (10), and a half nut body (20a, 20b) which is detachably screwed to the screw rod (10) by a hooking-off device (40);
A frame body (30) is provided outside the screw rod (10), and a pair of half nut bodies (20a, 20b) are provided inside the frame body (30) with the screw rod (10) interposed therebetween. Being guided by the frame body (30) and movable only in the contact / separation direction, and stored;
The half nut body (20a, 20b) has a flat portion (24) facing substantially parallel inside, and a screw thread to be screwed to the screw rod (10) is provided at a central portion of the flat portion (24). The provided screw recesses (25) are provided, and the screw recesses (25) are screwed less than half the circumference of the screw rod (10) in a state of being screwed to the screw rod (10), and the two flat portions (24) are screwed. , 24) are set so as to have a gap (L), and cut-off portions (23, 23) are provided at the corners of the screw recess (25) and the plane portion (24).
A spring (21, 21) is provided between the two half nut bodies (20a, 20b) to bias the two half nut bodies (20a, 20b) in the direction of unscrewing the two half nut bodies. Between the bodies (20a, 20b), spacers (22, 22, 22, 22) for keeping a predetermined distance between the two half nut bodies (20a, 20b) at four or more places,
In the hanging device (40), the outer frame (50) having the parallel guide rails (51, 51) is moved by being guided by the guide rails (51, 51) passing through the frame (30). The operating shaft (10) is held so as to allow the front end of the outer frame body (50) to come into contact with the outer surface of one half nut body (20a) by loosely inserting the frame body (30) from the one end side flange portion (52a). 53), a main operating rod (54) is provided on the other end side flange portion (52b) in a direction parallel to the guide rails (51, 51). The tip of the rod (54) is loosely inserted into the frame (30), and the spring (21, 21) is inserted between the main operation rod (54) and the outer surface of the other half nut body (20b). Reduce the distance of the half nut body (20a, 20b) against the urging force. Interposed spring (41) having a spring force that can further half nut device formed by providing a retaining (55) than the frame (30) at the tip portion of the main operation rod (54).