【０００１】
【発明の属する技術分野】
本発明は、駐車設備に於ける昇降車両支持台を昇降駆動する吊り索の張力検出装置に関するものである。
【０００２】
【従来の技術】
昇降車両支持台を昇降駆動する吊り索に作用する張力は、当該吊り索の繰り出しにより下降する昇降車両支持台が下降限に達したとき或いは下降途中で何かに引っ掛かって下降が中断したときには、規定値より小さくなり、当該吊り索の引き込みにより昇降車両支持台を上昇させているときは、昇降車両支持台が上昇限に達したとき或いは上昇途中で何かに引っ掛かって上昇が中断したときには、規定値より大きくなる。従って、この吊り索に作用する張力を検出し、その検出結果に基づいて吊り索の引き込み繰り出し装置を制御することにより、昇降車両支持台を下降限や上昇限で自動停止させたり、必要に応じて昇降途中で非常停止をかけることが出来る。
【０００３】
而して、この種の駐車設備の吊り索張力検出装置は、特許文献１にも記載されるように、昇降車両支持台を昇降駆動する吊り索を緊張方向に付勢するバネと、吊り索張力の変化に伴う前記バネの変形に連動して移動する被検出用可動体と、当該被検出用可動体の位置の変化を検出するセンサーとから構成されるものであるが、特許文献１に記載される従来の構成では、前記バネとして、吊り索に作用する昇降車両支持台側の最大荷重（搭載車両の許容最大重量＋昇降車両支持台の自重）に打ち勝つだけの強さの（バネ定数の大きな）１種類のバネが使用されていた。
【０００４】
【特許文献１】
特開２０００−２５７２９５公報
【０００５】
例えば、動滑車の使用により吊り索には昇降車両支持台側の荷重の半分が作用する構成に於いて、昇降車両支持台の自重が４００Ｋｇ、搭載車両の許容最大重量が２０００Ｋｇであって、吊り索に作用する昇降車両支持台側の荷重は２００Ｋｇ〜１２００Ｋｇの範囲で変化し、昇降車両支持台が下降限に達して吊り索に昇降車両支持台側の荷重が作用しなくなると、吊り索に作用する昇降車両支持台側の荷重は０になり、吊り索を緊張方向に付勢するバネとして、３０Ｋｇ／ｍｍのバネ定数の圧縮コイルスプリングが使用されていると仮定すると、吊り索に最大荷重（１２００Ｋｇ）が作用しているときの前記バネの縮み代は４０ｍｍ、空の昇降車両支持台を吊り下げている状態での前記バネの縮み代は７ｍｍ弱、昇降車両支持台が下降限に達して吊り索が無負荷の状態になると縮み代は０ｍｍとなる。
【０００６】
従って、昇降車両支持台が下降限に達した状態を、前記バネの変形（伸縮）に連動する被検出用可動体と当該被検出用可動体の位置の変化を検出するセンサーとで検出しようとした場合、前記バネの縮み代が７ｍｍ弱より若干小さくなったときの前記被検出用可動体の位置をセンサーで検出する必要があり、当該センサーの取付位置を正確に調整設定することが非常に困難になる。この結果、前記センサーの取付位置の僅かな誤差によって、昇降車両支持台が未だ下降限に達していないのに吊り索の繰り出しを停止してしまったり、昇降車両支持台が下降限に達した後も吊り索を繰り出すことによって当該吊り索が弛み過ぎて案内輪から外れる等の事故につながる恐れがあった。
【０００７】
【課題を解決するための手段】
本発明は上記のような従来の問題点を解消し得る駐車設備の吊り索張力検出装置を提供することを目的とするものであって、その手段を後述する実施形態の参照符号を付して示すと、昇降車両支持台１Ａ〜１Ｃを昇降駆動する吊り索６を緊張方向に付勢するバネと、吊り索張力の変化に伴う前記バネの変形に連動して移動する被検出用可動体１７と、当該被検出用可動体１７の位置の変化を検出するセンサーＳ１〜Ｓ３とを備えた吊り索張力検出装置であって、前記バネとして、強いバネ（圧縮コイルスプリング２３）と弱いバネ（圧縮コイルスプリング２１）とが設けられ、昇降車両支持台１Ａ〜１Ｃ側の負荷が吊り索６に作用している状態では前記弱いバネ（圧縮コイルスプリング２１）が弾性に抗して許容限まで変形した状態で前記強いバネ（圧縮コイルスプリング２３）が当該負荷を受け、昇降車両支持台１Ａ〜１Ｃ側の負荷が吊り索６に作用していない状態では前記弱いバネ（圧縮コイルスプリング２１）が許容限から弾性により変形して吊り索６を緊張方向に付勢する構成となっている。
【０００８】
上記構成の本発明を実施する場合、前記センサーとして、昇降車両支持台１Ａ〜１Ｃが下降限に達した以後の前記弱いバネ（圧縮コイルスプリング２１）の変形に伴う前記被検出用可動体１７の位置の変化を検出するセンサーＳ１と、昇降車両支持台１Ａ〜１Ｃが上昇限に達した以後の前記強いバネ（圧縮コイルスプリング２３）の変形に伴う前記被検出用可動体１７の移動を検出するセンサーＳ２，Ｓ３とを設けることが出来る。この場合、後者の昇降車両支持台１Ａ〜１Ｃが上昇限に達した以後の前記強いバネ（圧縮コイルスプリング２３）の変形に伴う前記被検出用可動体１７の移動を検出するセンサーとして、昇降車両支持台１Ａ〜１Ｃが上昇限に達した直後の前記被検出用可動体１７を検出する上昇限到着検出用センサーＳ２と、昇降車両支持台１Ａ〜１Ｃが上昇限に達した後の吊り索６の引き込み過ぎによって更に移動した前記被検出用可動体１７を検出する吊り索引き込み過ぎ検出用センサーＳ３との両方、若しくはその何れか一方を設けることが出来る。
【０００９】
又、前記弱いバネ（圧縮コイルスプリング２１）の弾性に抗しての変形許容限は、当該バネ自体の変形限度、例えば圧縮コイルスプリングの場合、当該スプリングが限度まで圧縮変形した状態とすることも出来るが、当該変形許容限を決めるバネ変形制限部材２２を別に設けるのが望ましい。
【００１０】
更に、前記強いバネと弱いバネとは、同心状で且つ両者の中間に介在される負荷伝達部材を介して直列する２つの圧縮コイルスプリング２１，２３で構成し、この直列する２つの圧縮コイルスプリング２１，２３の全体を貫通するロッド１６の一端に吊り索６の張力がかけられ、当該ロッド１６の他端のバネ受け座１８と固定バネ受け座１５との間で前記２つの圧縮コイルスプリング２１，２３を圧縮するように構成することが出来る。この場合、前記弱い圧縮コイルスプリング２１は、前記負荷伝達部材２０と固定バネ受け座１５との間に介装し、当該負荷伝達部材２０と固定バネ受け座１５の何れか一方に、当該両者間の接近移動量を制限するバネ変形制限部材２２を取り付けることが出来る。
【００１１】
【発明の実施の形態】
以下に本発明の好適実施形態を添付図に基づいて説明すると、図１Ａ及び図２に於いて、１Ａ〜１Ｃは並設された３台の昇降車両支持台であって、それぞれ固定フレーム側の昇降用ガイドレール兼用支柱２に案内されて上側支持レベルＵと入出庫レベル（下側支持レベル）Ｎとの間で昇降自在に支承されている。２Ａ，２Ｂは２台の自走可能な横行車両支持台であって、入出庫レベルＮに敷設された横行用ガイドレール３にそれぞれ車輪４を介して横行可能に支持されている。
【００１２】
５は昇降車両支持台１Ａ〜１Ｃの昇降駆動手段であって、吊り索６、この吊り索６の引き込み繰り出し手段としての巻き取りドラム７とドラム駆動用モーター８、及び吊り索張力検出装置９から構成されている。前記吊り索６は、一端が前記巻き取りドラム７に係止巻回されると共に他端が前記吊り索張力検出装置９に係止されたもので、その両端間で、各昇降車両支持台１Ａ〜１Ｃの後端部に軸支された被吊り下げ用回転案内輪１０ａ〜１０ｃと、この被吊り下げ用回転案内輪１０ａ〜１０ｃの真上に位置するように固定フレーム側に軸支された吊り下げ用回転案内輪（同軸２連）１１ａ〜１１ｃとを介して、各昇降車両支持台１Ａ〜１Ｃを順番に吊り下げている。この吊り索６の各被吊り下げ用回転案内輪１０ａ〜１０ｃ及び吊り下げ用回転案内輪１１ａ〜１１ｃに対する巻回方向は、巻き取りドラム７に対する巻回方向と同じ向きである。
【００１３】
而して、巻き取りドラム７を正転駆動して吊り索６を引き込むことにより、全ての昇降車両支持台１Ａ〜１Ｃが上側支持レベルＵまで吊り上げられ、固定フレーム側の上昇限ストッパー１２で制止される上昇限位置まで上昇する。又、巻き取りドラム７を逆転駆動して吊り索６を繰り出すことにより、重力で降下出来る状態にある昇降車両支持台１Ａ〜１Ｃは、吊り索６の繰り出しに伴って入出庫レベルＮまで吊り下ろされ、固定フレーム側や地表レベルの基礎スラブ上等の適当箇所に設けられた下降限ストッパー（図示例では、固定フレーム側に架設された横行車両支持台２Ａ，２Ｂの横行用ガイドレール３を利用）で制止される下降限位置まで下降する。
【００１４】
図示の実施形態では、昇降車両支持台１Ａ〜１Ｃの内、任意の１台を入出庫レベルＮへ下降可能な状態にする手段として、横行車両支持台２Ａ，２Ｂに設けた受け止め用フレーム１３ａ，１３ｂを使用している。即ち、各横行車両支持台２Ａ，２Ｂの後端部には、上側支持レベルＵにある昇降車両支持台１Ａ〜１Ｃを受け止めて上側支持レベルＵからの下降を阻止する受け止め用フレーム１３ａ，１３ｂが立設されている。この受け止め用フレーム１３ａ，１３ｂを使用した手段は一例であって、昇降車両支持台１Ａ〜１Ｃの内、任意の１台を入出庫レベルＮへ下降可能な状態にする手段としては、如何なる構成のものでも使用出来る。
【００１５】
次に吊り索張力検出装置９の具体構造を説明すると、図１Ｂ、図３、及び図４に示すように、固定フレーム側への取付台１４上に立設された固定バネ受け座１５を貫通するロッド１６、このロッド１６の一端に同心状に連結された被検出用可動体１７、前記ロッド１６の他端に取り付けられたバネ受け座１８、前記ロッド１６に外嵌し且つ一端が前記固定バネ受け座１５に固着されたガイドスリーブ１９、このガイドスリーブ１８に遊嵌された負荷伝達部材２０、この負荷伝達部材２０と固定バネ受け座１５との間でガイドスリーブ１８に遊嵌された弱い圧縮コイルスプリング２１、この圧縮コイルスプリング２１の圧縮変形量を制限するために当該圧縮コイルスプリング２１に外嵌する状態で一端が前記固定バネ受け座１５に固着された円筒状のバネ変形制限部材２２、前記負荷伝達部材２０とロッド端部のバネ受け座１８との間でロッド１６に外嵌された強い圧縮コイルスプリング２３、及び前記被検出用可動体１７の位置の変化を検出するセンサーＳ１〜Ｓ３から構成され、前記被検出用可動体１７に吊り索６の端末が結合されている。
【００１６】
従って吊り索６は、被検出用可動体１７、ロッド１６、及びバネ受け座１８を介して、同心状に直列する強弱２つの圧縮コイルスプリング２１，２３の圧縮反力を受けて緊張方向に付勢されることになるが、各スプリング２１，２３の強さ（バネ定数）は、次のように設定されている。即ち、図１Ａに示すように、全ての昇降車両支持台１Ａ〜１Ｃが下降限ストッパー（横行用ガイドレール３）と横行車両支持台２Ａ，２Ｂ上の受け止め用フレーム１３ａ，１３ｂで支持されていて、吊り索６に昇降車両支持台１Ａ〜１Ｃ側の荷重が作用していない状態では、図１Ｂ及び図３Ａに示すように、強い圧縮コイルスプリング２３が伸長限まで伸長した状態で、吊り索６が弱い圧縮コイルスプリング２１の伸長により緊張せしめられ、吊り索６に空の昇降車両支持台１台分の重量以上の荷重が作用したときは、図３Ｂに示すように強い圧縮コイルスプリング２３と負荷伝達部材２０とを介して弱い圧縮コイルスプリング２１が固定バネ受け座１５との間で圧縮され、当該弱い圧縮コイルスプリング２１が完全に圧縮される直前で負荷伝達部材２０がバネ変形制限部材２２に当接し、吊り索６に作用する昇降車両支持台１Ａ〜１Ｃ側の荷重が強い圧縮コイルスプリング２３で受け止められるように構成されている。
【００１７】
センサーＳ１〜Ｓ３は、図１Ｂ及び図４に示すように、固定バネ受け座１５に取り付けられて被検出用可動体１７の移動経路脇に位置する支持板２４に取り付けられて、磁性体製の被検出用可動体１７と対面したときにＯＮ動作するものであり、それぞれセンサーＳ１〜Ｓ３が取り付けられた基板２５が、支持板２４に設けられた長円形開口部２８から各センサーＳ１〜Ｓ３が被検出用可動体１７の移動経路側に露出するように、当該支持板２４の外側面（被検出用可動体１７のある側とは反対側）に、当該支持板２４に設けられた長孔２６と２つのボルトナット２７とで被検出用可動体１７の移動方向に位置調整自在に取り付けられている。
【００１８】
而して、この実施形態に於けるセンサーＳ１は、図１Ａに示すように、全ての昇降車両支持台１Ａ〜１Ｃが下降限ストッパー（横行用ガイドレール３）と横行車両支持台２Ａ，２Ｂ上の受け止め用フレーム１３ａ，１３ｂで支持された状態を検出する下降限検出用センサーであり、センサーＳ２は、全ての昇降車両支持台１Ａ〜１Ｃが上昇限ストッパー１２で上昇を制止された状態を検出する上昇限検出用センサーであり、センサーＳ３は、上昇限検出用センサーＳ２が検出動作する状態から更に吊り索６を引き込んだときに働く過剰引き込み検出用センサーである。
【００１９】
以下、具体的に使用方法及び作用を説明すると、下側に横行車両支持台が位置していない昇降車両支持台（図１では昇降車両支持台１Ａ）は、巻き取りドラム７を逆転駆動して吊り索６を繰り出すことにより入出庫レベルＮまで吊り下ろして下降限ストッパー（横行車両支持台２Ａ，２Ｂの横行用ガイドレール３）で受け止めさせ、他の昇降車両支持台（図１では昇降車両支持台１Ｂ，１Ｃ）は、横行車両支持台２Ａ，２Ｂ上の受け止め用フレーム１３ａ，１３ｂでそのまま上側支持レベルＵで受け止めさせた状態を初期状態とすれば、この初期状態では、入出庫レベルＮに位置する１台の昇降車両支持台と２台の横行車両支持台２Ａ，２Ｂとに対しては、自由に車両の自走による積み下ろし作業を行うことが出来る。
【００２０】
而して、上記の初期状態では、吊り索６には昇降車両支持台１Ａ〜１Ｃ側の荷重が一切作用しておらず、吊り索６は、図３Ａに示すように、負荷伝達部材２０、伸長限まで伸長した状態の強い圧縮コイルスプリング２３、バネ受け座１８、ロッド１６、及び被検出用可動体１７を介して、弱い圧縮コイルスプリング２１の付勢力（圧縮反力）を受け、各回転案内輪１０ａ〜１１ｃから外れない程度に緊張せしめられている。このときの被検出用可動体１７の位置を、下降限相当位置Ｐ１として示しており、当該下降限相当位置Ｐ１に達した被検出用可動体１７を下降限検出用センサーＳ１が検出してＯＮ動作するように、当該下降限検出用センサーＳ１の取付位置が調整されている。
【００２１】
図１に於いて、上側支持レベルＵに位置する昇降車両支持台１Ｂ（又は１Ｃ）に対して車両の積み下ろし作業を行うときは、横行車両支持台２Ａ（又は２Ａ，２Ｂ）を横動させる前に、巻き取りドラム７を正転駆動して吊り索６を引き込み、全ての昇降車両支持台１Ａ〜１Ｃを上側支持レベルＵの上昇限位置、即ち、上昇限ストッパー１２で上昇を制止される位置まで吊り上げる。而して吊り索張力検出装置９では、吊り索６の引き込みに伴って先ず最初に図３Ａに示す初期状態から伸長状態にあった弱い圧縮コイルスプリング２１が、バネ変形制限部材２２に負荷伝達部材２０が当接する変形制限状態まで圧縮されて縮小し、被検出用可動体１７が図３Ａに示す下降限検出位置Ｐ１から図３Ｂに示す中立位置Ｐ２に移動する。このとき、下降限検出用センサーＳ１は、被検出用可動体１７から離れてＯＦＦ状態になる。
【００２２】
この後の吊り索６の引き込みにより、当該吊り索６には、１台の昇降車両支持台の半分の荷重（昇降車両支持台の自重＋搭載車両重量）が作用するので、吊り索張力検出装置９では、吊り索６に作用する負荷が被検出用可動体１７、ロッド１８、及びバネ受け座１８を介して強い圧縮コイルスプリング２３に作用し、バネ変形制限部材２２に当接して位置固定状態の負荷伝達部材２０との間で強い圧縮コイルスプリング２３が圧縮されて縮小し、被検出用可動体１７がロッド１６と共に吊り索６に引っ張られて、図３Ｂに示す中立位置から図の右方へ移動することになる。このときの被検出用可動体１７の中立位置からの移動量（強い圧縮コイルスプリング２３の縮小量）は、吊り索６が吊り下げる昇降車両支持台側の負荷の大きさに比例するので、許容最大重量の車両を搭載している昇降車両支持台を吊り索６が吊り下げているときの被検出用可動体１７の中立位置からの移動量では、当該被検出用可動体１７が上昇限検出用センサーＳ２によって検出されないように、当該上昇限検出用センサーＳ２の取付位置が設定されている。
【００２３】
吊り索６の引き込みが進んで全ての昇降車両支持台１Ａ〜１Ｃが上昇限ストッパー１２で上昇を制止される上昇限位置に達すると、その後の吊り索６の引き込みに伴って当該吊り索６が強い圧縮コイルスプリング２３を直接圧縮して縮小させ、被検出用可動体１７が昇降車両支持台を吊り上げている途中の安定位置から更に吊り索６で引っ張られる方向（図３の右方）へ移動し、図３Ｃに示す上昇限相当位置Ｐ３に達する。このとき上昇限検出用センサーＳ２が被検出用可動体１７を検出してＯＮ動作するように、当該上昇限検出用センサーＳ２の取付位置を設定しておくことにより、当該上昇限検出用センサーＳ２のＯＮ動作に基づいて巻き取りドラム７の正転駆動を自動停止させることが出来る。
【００２４】
若し仮に、全ての昇降車両支持台１Ａ〜１Ｃが上昇限ストッパー１２で上昇を制止される上昇限位置に達して前記のように被検出用可動体１７が上昇限相当位置Ｐ３に達したにもかかわらず、上昇限検出用センサーＳ２がＯＮ動作せず、又はＯＮ動作したがこれに基づく巻き取りドラム７の自動停止が正常に行われなかったとき等は、更に吊り索６の引き込みが継続されて強い圧縮コイルスプリング２３の圧縮量が増大し、被検出用可動体１７が上昇限相当位置Ｓ３を超えて吊り索６に引っ張られる方向に移動することになるので、当該被検出用可動体１７が図３Ｃに示す過剰引き込み相当位置Ｓ４に達したとき、過剰引き込み検出用センサーＳ３が被検出用可動体１７を検出してＯＮ動作するように、当該過剰引き込み検出用センサーＳ３の取付位置を設定しておくことにより、当該過剰引き込み検出用センサーＳ３のＯＮ動作に基づいて巻き取りドラム７の正転駆動に非常停止をかける等、必要な非常時対策を講ずることが出来る。
【００２５】
上記のようにして全ての昇降車両支持台１Ａ〜１Ｃを上昇限ストッパー１２で上昇を制止される上昇限位置まで吊り上げたならば、横行車両支持台２Ａ，２Ｂの受け止め用フレーム１３ａ，１３ｂとその上の昇降車両支持台１Ｂ，１Ｃとの間にも隙間が生じるので、係る状態で横行車両支持台２Ａを昇降車両支持台１Ａの真下位置まで横動させ（又は両横行車両支持台２Ａ，２Ｂを昇降車両支持台１Ａ，１Ｂの真下位置まで横動させ）て、作業対象の昇降車両支持台１Ｂ（又は１Ｃ）の真下位置の入出庫レベルＮに空きスペースを確保し、この後、再び巻き取りドラム７を逆転駆動して吊り索６を繰り出し、作業対象の昇降車両支持台１Ｂ（又は１Ｃ）を入出庫レベルＮまで吊り下ろして下降限ストッパー（横行車両支持台２Ａ，２Ｂの横行用ガイドレール３）で受け止めさせると共に、他の昇降車両支持台は、横行車両支持台２Ａ，２Ｂ上の受け止め用フレーム１３ａ，１３ｂでそのまま上側支持レベルＵで受け止めさせる。即ち、先に説明した初期状態とすれば、入出庫レベルＮに位置する作業対象の昇降車両支持台１Ｂ（又は１Ｃ）と２台の横行車両支持台２Ａ，２Ｂとに対して車両の自走による積み下ろし作業を行うことが出来る。
【００２６】
上記のように全ての昇降車両支持台１Ａ〜１Ｃがそれ以上下降出来ない下降限位置に達して初期状態となったとき、先に説明したように被検出用可動体１７を下降限検出用センサーＳ１が検出してＯＮ動作するので、この下降限検出用センサーＳ１のＯＮ動作に基づいて巻き取りドラム７の逆転駆動が自動停止される。
【００２７】
尚、図１に仮想線で示すように、上昇限検出用センサーＳ２は省くことも出来る。この場合は、各昇降車両支持台１Ａ〜１Ｃが上昇限ストッパー１２で制止される上昇限位置に達した状態を個別に検出するセンサーを固定フレーム側に配設し、この各昇降車両支持台１Ａ〜１Ｃごとの上昇限検出用センサーを直列に接続する等して、各昇降車両支持台１Ａ〜１Ｃごとの上昇限検出用センサーの全てがＯＮ動作したとき、巻き取りドラム７の正転駆動を自動停止させるように構成しても良い。
【００２８】
上記実施形態では、本発明の吊り索張力検出装置は、入出庫レベルＮとこれより上方の上側支持レベルＵとの間で昇降する上側昇降車両支持台の昇降駆動用吊り索の張力検出装置として利用したが、入出庫レベルとこれよりも下方の下側支持レベルとの間で昇降する下側昇降車両支持台の昇降駆動用吊り索の張力検出装置としても利用することが出来るし、上側昇降車両支持台と下側昇降車両支持台とを一括で昇降駆動する吊り索の張力検出装置としても利用することが出来る。又、吊り索による各昇降車両支持台の吊り下げ方法（吊り索の掛け回し方法）や、その引き込み繰り出し手段も、上記実施形態のものに限定されない。従って勿論、本発明の張力検出装置に対する吊り索の連係構成も、上記実施形態に示したように吊り索の端末を直接緊張方向に付勢する構成に限定されるものではなく、例えば、回転案内輪を介して吊り索の中間部を緊張方向に付勢する構成であっても良いし、１本の吊り索を折り返して二重吊り索とし、この二重吊り索で各昇降車両支持台を吊り下げる構成に於いて、回転案内輪を介して当該吊り索の一端折り返し部を緊張方向に付勢する構成等であっても良い。
【００２９】
【発明の効果】
本発明は以上のように実施し且つ使用することが出来るものであって、係る本発明の駐車設備の吊り索張力検出装置によれば、昇降車両支持台を昇降駆動する吊り索を緊張方向に付勢するバネとして強いバネと弱いバネとの２種類を使用し、昇降車両支持台自重や搭載車両等の大きな負荷が吊り索に作用している状態では前記強いバネで当該大きな負荷を受けさせ、昇降車両支持台側の負荷が吊り索に作用していない状態では前記弱いバネで吊り索を緊張方向に付勢するものであるから、１つの弱いバネで前記の大きな負荷を受けさせる場合と比較して装置の小型化を図ることが出来るものでありながら、吊り索の繰り出しにより昇降車両支持台が下降限まで下ろされた直後等には、弱いバネの弾性復帰に伴う大きな変形量で被検出用可動体を大きく変位させ、昇降車両支持台の下降限検出等を容易且つ確実に行わせることが出来る。従って、昇降車両支持台の下降限検出等を受け持つセンサーの取付位置の調整が容易になり、当該昇降車両支持台の下降限検出等を確実に行わせることが出来る。
【００３０】
尚、請求項２に記載の構成によれば、昇降車両支持台が下降限に達した状態と昇降車両支持台が上昇限に達した状態（昇降車両支持台が上昇限に達した直後の状態とそれ以降の吊り索の引き込み過ぎ状態との両方、若しくはその何れか一方）を自動検出させることが出来る。
【００３１】
又、請求項３に記載の構成によれば、バネ変形制限部材で弱いバネの弾性に抗しての変形許容限を決めることが出来るので、弱いバネ自体の変形限界状態で大荷重を受けさせる場合のように、弱いバネの破損を防止出来、安全性を高めることが出来る。
【００３２】
更に、請求項４や請求項５に記載の構成によれば、強いバネと弱いバネとを直列に配置して装置を簡単に構成することが出来る。
【図面の簡単な説明】
【図１】Ａ図は駐車設備全体の構成を示す概略背面図であり、Ｂ図は本発明による吊り索張力検出装置の一実施形態を示す平面図である。
【図２】各昇降車両支持台の昇降用駆動手段を説明する斜視図である。
【図３】図１Ｂに示す吊り索張力検出装置の動作状態を説明する縦断側面図であって、Ａ図は昇降車両支持台が下降限に達している状態を示し、Ｂ図は昇降車両支持台が吊り下げられた状態を示し、Ｃ図は吊り索の引き込み過ぎ状態を示す。
【図４】図１Ｂに示す吊り索張力検出装置のセンサー取付構造を説明する側面図である。
【符号の説明】
１Ａ〜１Ｃ 昇降車両支持台
２Ａ，２Ｂ 横行車両支持台
３ 横行用ガイドレール
６ 吊り索
７ 巻き取りドラム（吊り索引き込み繰り出し手段）
８ モーター
９ 吊り索張力検出装置
１０ａ〜１０ｃ 被吊り下げ用回転案内輪
１１ａ〜１１ｃ 吊り下げ用回転案内輪（同軸２連）
１２ 上昇限ストッパー
１３ａ，１３ｂ 受け止め用フレーム
１５ 固定バネ受け座
１６ ロッド
１７ 被検出用可動体
１８ バネ受け座
１９ ガイドスリーブ
２０ 負荷伝達部材
２１ 弱い圧縮コイルスプリング
２２ バネ変形制限部材
２３ 強い圧縮コイルスプリング
Ｓ１〜Ｓ３ センサー
Ｕ 上側支持レベル
Ｎ 入出庫レベル（下側支持レベル）[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a tension detecting device for a suspension cable for driving a lifting vehicle support base up and down in a parking facility.
[0002]
[Prior art]
The tension acting on the suspension cable that drives the lifting vehicle support up and down, when the lifting vehicle support descending by the extension of the suspension cable reaches the descent limit or when the descent is interrupted by being caught by something during the descent, When it is smaller than the prescribed value and the lifting vehicle support is raised by pulling in the hanging cable, when the lifting vehicle support reaches the ascent limit or when it is caught by something during the ascent and the ascent is interrupted, It becomes larger than the specified value. Therefore, by detecting the tension acting on the hanging cable and controlling the pulling-in / drawing-out device of the hanging cable based on the detection result, the lifting / lowering vehicle support base can be automatically stopped at the lower limit or the upper limit, or can be stopped as necessary. Emergency stop can be applied during ascent and descent.
[0003]
As described in Patent Document 1, this type of hanging cable tension detecting device for a parking facility includes a spring that urges a hanging cable that drives a lifting / lowering vehicle support base up and down in a tensioning direction, and a hanging cable. It comprises a movable body for detection that moves in conjunction with the deformation of the spring due to a change in tension, and a sensor that detects a change in the position of the movable body for detection. In the conventional configuration described, the spring has a strength (spring constant) enough to overcome the maximum load (allowable maximum weight of the mounted vehicle + the weight of the lifting vehicle support) acting on the suspension cable on the side of the lifting vehicle. One type of spring was used.
[0004]
[Patent Document 1]
JP 2000-257295 A
For example, in a configuration in which half of the load on the lifting vehicle support side acts on the suspension cable by use of the moving pulley, the weight of the lifting vehicle support base is 400 kg, the maximum allowable weight of the mounted vehicle is 2000 kg, and The load on the lifting vehicle supporting platform acting on the rope changes in the range of 200 kg to 1200 kg. When the lifting vehicle supporting platform reaches the lower limit and the load on the lifting vehicle supporting platform no longer acts on the suspension cable, the lifting cable is applied to the suspension cable. Assuming that a load acting on the lifting vehicle support side is 0 and a compression coil spring having a spring constant of 30 kg / mm is used as a spring for urging the suspension cable in the tension direction, the maximum load is applied to the suspension cable. (1200 Kg), the allowance of the spring is 40 mm, the allowance of the spring when the empty lift vehicle support is suspended is less than 7 mm, and the lift vehicle support is at the lower limit. To hanging rope is margin shrinkage to be a state of no-load becomes 0mm.
[0006]
Therefore, it is attempted to detect the state in which the elevating vehicle support has reached the lowering limit by the detected movable body linked to the deformation (expansion and contraction) of the spring and a sensor for detecting a change in the position of the detected movable body. In such a case, it is necessary to detect the position of the movable body for detection when the shrinkage of the spring is slightly smaller than less than 7 mm with a sensor, and it is very difficult to accurately adjust and set the mounting position of the sensor. It becomes difficult. As a result, due to a slight error in the mounting position of the sensor, the suspension of the hanging rope is stopped even though the ascending and descending vehicle support has not yet reached the descent limit, or after the ascending and descending vehicle support has reached the descent limit. Also, if the suspension cable is extended, the suspension cable may be excessively slackened, leading to an accident such as detachment from the guide wheel.
[0007]
[Means for Solving the Problems]
An object of the present invention is to provide a hanging rope tension detecting device for parking equipment capable of solving the above-mentioned conventional problems, and the means thereof are denoted by reference numerals in the embodiments described later. As shown, a spring that urges the suspension cable 6 that drives the lifting vehicle support bases 1A to 1C up and down in a tensioning direction, and a detected movable body 17 that moves in conjunction with the deformation of the spring due to a change in the tension of the suspension cable. And a sensor S1 to S3 for detecting a change in the position of the detected movable body 17, wherein the spring includes a strong spring (compression coil spring 23) and a weak spring (compression). In a state where the load on the lifting vehicle support bases 1A to 1C is acting on the hanging rope 6, the weak spring (compression coil spring 21) is deformed to the permissible limit against the elasticity. In the condition In a state where the spring (compression coil spring 23) receives the load and the load on the lifting vehicle support bases 1A to 1C is not acting on the hanging rope 6, the weak spring (compression coil spring 21) is elastically deformed from the allowable limit. Then, the suspension cable 6 is urged in the tension direction.
[0008]
When the present invention having the above configuration is implemented, as the sensor, the movable body 17 to be detected accompanying the deformation of the weak spring (compression coil spring 21) after the ascending and descending vehicle support bases 1A to 1C reach the lower limit. A sensor S1 for detecting a change in position, and a movement of the movable body 17 to be detected due to deformation of the strong spring (compression coil spring 23) after the ascending and descending vehicle supports 1A to 1C reach the ascending limit. Sensors S2 and S3 can be provided. In this case, the ascending / descending vehicle is used as a sensor for detecting the movement of the movable body 17 to be detected accompanying the deformation of the strong spring (compression coil spring 23) after the latter ascending / descending vehicle supporting bases 1A to 1C reach the ascending limit. An ascent detection sensor S2 for detecting the movable body 17 to be detected immediately after the supports 1A to 1C have reached the ascending limit, and a hanging cable 6 after the ascending and descending vehicle supports 1A to 1C have reached the ascending limit. And / or any one of the hanging index over-detection detecting sensor S3 for detecting the detected movable body 17 further moved due to excessive pull-in.
[0009]
Further, the deformation limit of the weak spring (compression coil spring 21) against the elasticity may be a deformation limit of the spring itself, for example, in the case of a compression coil spring, the spring may be in a state where the spring is compressed and deformed to the limit. Although it is possible, it is desirable to separately provide a spring deformation limiting member 22 for determining the deformation allowable limit.
[0010]
Further, the strong spring and the weak spring are composed of two compression coil springs 21 and 23 which are concentric and are connected in series via a load transmitting member interposed between the two. The tension of the suspension cable 6 is applied to one end of the rod 16 penetrating the entirety of the rods 21 and 23, and the two compression coil springs 21 are moved between the spring receiving seat 18 and the fixed spring receiving seat 15 at the other end of the rod 16. , 23 can be configured to be compressed. In this case, the weak compression coil spring 21 is interposed between the load transmitting member 20 and the fixed spring receiving seat 15, and is provided on one of the load transmitting member 20 and the fixed spring receiving seat 15. A spring deformation restricting member 22 for restricting the amount of approaching movement can be attached.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1A and 2, reference numerals 1A to 1C denote three side-by-side elevating vehicle supports, each of which is provided on a fixed frame side. It is guided by the elevating guide rail / supporting column 2 and is supported between the upper support level U and the loading / unloading level (lower support level) N so as to be able to move up and down. Reference numerals 2A and 2B denote two self-propelled traversing vehicle supports, which are traversably supported by traversing guide rails 3 laid at an entrance / exit level N via wheels 4 respectively.
[0012]
Reference numeral 5 denotes a lifting / lowering drive means for the lifting / lowering vehicle support bases 1A to 1C. The lifting / lowering drive means 5 includes a lifting line 6, a winding drum 7 and a drum driving motor 8 as a pulling-in / out means for pulling out the lifting line 6, and a lifting line tension detecting device 9. It is configured. The hanging cable 6 has one end locked and wound on the winding drum 7 and the other end locked on the hanging cable tension detecting device 9. １1C is supported on the fixed frame side so as to be positioned directly above the suspended rotation guide wheels 10a to 10c supported at the rear end thereof. The lifting vehicle supports 1A to 1C are sequentially suspended via the suspension rotary guide wheels (two coaxial links) 11a to 11c. The winding direction of the suspension rope 6 around the suspended rotation guide wheels 10a to 10c and the suspension rotation guide wheels 11a to 11c is the same as the winding direction of the winding drum 7.
[0013]
Thus, by driving the winding drum 7 to rotate in the normal direction and pulling the suspension ropes 6, all the ascending and descending vehicle supports 1 </ b> A to 1 </ b> C are lifted up to the upper support level U and stopped by the stoppers 12 on the fixed frame side. To the upper limit position. Further, by lifting the take-up drum 7 in the reverse direction and paying out the hanging ropes 6, the ascending and descending vehicle supports 1 </ b> A to 1 </ b> C, which can be lowered by gravity, are suspended to the loading / unloading level N as the hanging ropes 6 are pulled out. And a lower limit stopper provided at an appropriate place on the fixed frame side or on the ground-level foundation slab (in the illustrated example, the traversing guide rails 3 of the traversing vehicle support bases 2A and 2B installed on the fixed frame side are used. ), It descends to the lower limit position where it is stopped.
[0014]
In the illustrated embodiment, as means for making any one of the ascending and descending vehicle supports 1A to 1C capable of descending to the entry / exit level N, receiving frames 13a provided on the traversing vehicle supports 2A and 2B, 13b is used. That is, receiving frames 13a and 13b which receive the ascending and descending vehicle supports 1A to 1C at the upper support level U and prevent the lowering from the upper support level U are provided at the rear ends of the traversing vehicle supports 2A and 2B. It is erected. The means using the receiving frames 13a and 13b is merely an example, and any means for lowering any one of the ascending and descending vehicle supports 1A to 1C to the loading / unloading level N may be used. Can be used.
[0015]
Next, the specific structure of the hanging cable tension detecting device 9 will be described. As shown in FIGS. 1B, 3, and 4, a fixed spring receiving seat 15 erected on the mounting base 14 on the fixed frame side is penetrated. A rod 16 to be detected, a movable body 17 to be detected concentrically connected to one end of the rod 16, a spring receiving seat 18 attached to the other end of the rod 16, an outer fitting on the rod 16 and one end fixed to the rod 16 A guide sleeve 19 fixed to the spring receiving seat 15, a load transmitting member 20 loosely fitted to the guide sleeve 18, and a weak fit loosely fitted to the guide sleeve 18 between the load transmitting member 20 and the fixed spring receiving seat 15. A compression coil spring 21, a circle having one end fixed to the fixed spring receiving seat 15 in a state of being fitted to the compression coil spring 21 in order to limit the amount of compression deformation of the compression coil spring 21. Spring deformation restricting member 22, a strong compression coil spring 23 externally fitted to rod 16 between load transmitting member 20 and spring receiving seat 18 at the rod end, and the position of movable body 17 to be detected. It comprises sensors S1 to S3 for detecting a change, and the terminal of the hanging cable 6 is connected to the movable body 17 to be detected.
[0016]
Therefore, the hanging cable 6 is attached in the tension direction by the compression reaction force of the two compression coil springs 21 and 23 concentrically connected in series via the movable body 17 to be detected, the rod 16 and the spring receiving seat 18. The strength (spring constant) of each of the springs 21 and 23 is set as follows. That is, as shown in FIG. 1A, all the ascending and descending vehicle support bases 1A to 1C are supported by a descent limit stopper (traverse guide rail 3) and receiving frames 13a and 13b on the traverse vehicle support bases 2A and 2B. In a state in which no load on the lifting vehicle support bases 1A to 1C is applied to the suspension cable 6, as shown in FIGS. 1B and 3A, the suspension cable 6 is extended with the strong compression coil spring 23 extended to the extension limit. When the load is applied to the suspension cable 6 by a weight equal to or greater than the weight of one empty lifting / lowering vehicle support base, the strong compression coil spring 23 and the strong compression coil spring 23 as shown in FIG. The weak compression coil spring 21 is compressed between the fixed spring receiving seat 15 and the weak compression coil spring 21 via the transmission member 20, and the load is applied immediately before the weak compression coil spring 21 is completely compressed. Reaches member 20 abuts on the spring deformation limiting member 22, the load of the elevator car support base 1A~1C side acting on the suspending member 6 is adapted to be received by the strong compression coil spring 23.
[0017]
As shown in FIGS. 1B and 4, the sensors S1 to S3 are attached to a fixed spring receiving seat 15 and attached to a support plate 24 located on the side of the movement path of the movable body 17 to be detected, and are made of a magnetic material. The sensor 25 is turned ON when facing the movable body 17 to be detected, and the substrate 25 to which the sensors S1 to S3 are attached, respectively, and the sensors S1 to S3 from the oblong opening portion 28 provided in the support plate 24. A long hole provided in the support plate 24 is provided on the outer surface of the support plate 24 (the side opposite to the side where the detection movable body 17 is located) so as to be exposed on the movement path side of the detected movable body 17. 26 and two bolts and nuts 27 are attached so that the position can be adjusted in the moving direction of the movable body 17 for detection.
[0018]
Thus, as shown in FIG. 1A, the sensor S1 in this embodiment is configured such that all the ascending and descending vehicle supports 1A to 1C are on the lower limit stopper (traversing guide rail 3) and the traversing vehicle supports 2A and 2B. The sensor S2 detects a state in which all the ascending and descending vehicle supports 1A to 1C are stopped from ascending by the ascending limit stoppers 12. The sensor S3 is an over-pull-in detection sensor that works when the hanging line 6 is further pulled in from the state in which the up-limit detection sensor S2 performs a detection operation.
[0019]
Hereinafter, the method of use and the operation will be described in detail. The lift vehicle support base (the lift vehicle support 1A in FIG. 1) in which the traversing vehicle support is not positioned below drives the winding drum 7 in the reverse direction. The suspension cable 6 is extended to be lowered to the entry / exit level N by being pulled out and received by the lower limit stoppers (traverse guide rails 3 of the traversing vehicle supports 2A, 2B). The bases 1B, 1C) are set to the entrance / exit level N in this initial state, assuming that the state of being received at the upper support level U by the receiving frames 13a, 13b on the traversing vehicle support bases 2A, 2B is the initial state. The unloading operation by the self-propelled movement of the vehicle can be freely performed on the one lift vehicle support stand and the two transverse vehicle support stands 2A and 2B.
[0020]
Thus, in the above initial state, no load is applied to the suspension cable 6 on the side of the lifting vehicle support bases 1A to 1C, and the suspension cable 6 is, as shown in FIG. The urging force (compression reaction force) of the weak compression coil spring 21 is received via the strong compression coil spring 23, the spring receiving seat 18, the rod 16, and the detected movable body 17 in the state of being extended to the extension limit, and each rotation is performed. The guide wheels 10a to 11c are tensioned so as not to come off. The position of the detected movable body 17 at this time is shown as the lower limit corresponding position P1, and the lower movable sensor 17 that has reached the lower limit corresponding position P1 is detected by the lower limit sensor S1 and turned on. The mounting position of the lower limit detection sensor S1 is adjusted to operate.
[0021]
In FIG. 1, when loading / unloading a vehicle with respect to the elevating vehicle support 1B (or 1C) located at the upper support level U, before moving the traversing vehicle support 2A (or 2A, 2B) sideways. Then, the take-up drum 7 is driven to rotate in the normal direction, the suspension cable 6 is pulled in, and all the ascending and descending vehicle supports 1A to 1C are moved to the upper limit position of the upper support level U, that is, the position where the raising is stopped by the upper limit stopper 12. Lift up to. In the hanging cable tension detecting device 9, the weak compression coil spring 21 which has been in the extended state from the initial state shown in FIG. The movable body 17 to be detected moves from the lower limit detection position P1 shown in FIG. 3A to the neutral position P2 shown in FIG. At this time, the sensor S1 for detecting the lower limit is separated from the movable body 17 to be detected and is turned off.
[0022]
When the suspension cable 6 is retracted thereafter, a half of the load (the weight of the lifting / lowering vehicle support + the weight of the mounted vehicle) acts on the suspension cable 6, so that the suspension cable tension detecting device is used. In FIG. 9, the load acting on the hanging cable 6 acts on the strong compression coil spring 23 via the movable body 17 to be detected, the rod 18 and the spring receiving seat 18 to contact the spring deformation restricting member 22 to fix the position. The strong compression coil spring 23 is compressed and contracted between the load transmission member 20 and the movable body for detection 17 is pulled by the hanging cable 6 together with the rod 16 to move from the neutral position shown in FIG. Will be moved to. At this time, the amount of movement of the movable body 17 to be detected from the neutral position (the amount of reduction of the strong compression coil spring 23) is proportional to the magnitude of the load on the lift vehicle support that the hanging cable 6 hangs. The amount of movement of the movable body 17 to be detected from the neutral position when the hanging rope 6 hangs the lifting vehicle supporting table on which the vehicle having the largest weight is mounted is detected by the movable body 17 to be detected. The mounting position of the ascent limit detection sensor S2 is set so as not to be detected by the use sensor S2.
[0023]
When the pulling of the suspension cable 6 proceeds and all the ascending and descending vehicle supports 1 </ b> A to 1 </ b> C reach an ascending limit position where the lifting is stopped by the lifting stopper 12, the suspension cable 6 is pulled in with the subsequent pulling of the suspension cable 6. The strong compression coil spring 23 is directly compressed and contracted, and moves in a direction (rightward in FIG. 3) in which the movable body 17 to be detected is further pulled by the hanging cable 6 from a stable position in the middle of lifting the elevating vehicle support base. Then, the position reaches the ascending limit equivalent position P3 shown in FIG. 3C. At this time, by setting the mounting position of the ascending limit detection sensor S2 so that the ascending limit detecting sensor S2 detects the movable body 17 to be detected and turns on, the ascending limit detecting sensor S2 is set. , The forward drive of the winding drum 7 can be automatically stopped based on the ON operation of.
[0024]
If all the ascending and descending vehicle supports 1A to 1C reach the ascending limit position where the ascending limit is stopped by the ascending limit stopper 12, and the movable body 17 to be detected reaches the ascending limit corresponding position P3 as described above. Nevertheless, when the ascending limit detection sensor S2 does not perform the ON operation or performs the ON operation, but the automatic stop of the winding drum 7 based on the ON operation is not normally performed, the pulling of the suspension cable 6 is further continued. As a result, the compression amount of the strong compression coil spring 23 increases, and the movable body 17 to be detected moves in a direction in which it is pulled by the hanging cable 6 beyond the position S3 corresponding to the ascending limit. When the sensor 17 reaches the position S4 corresponding to excessive retraction shown in FIG. 3C, the sensor S3 for excessive retraction detection detects the movable body 17 to be detected and turns on the sensor S3. By setting the mounting position, the excess pull like the emergency stop also forward rotation of the winding drum 7 based on the ON operation of the detecting sensor S3, it is possible to take emergency measures necessary.
[0025]
When all the lift vehicle supports 1A to 1C are lifted to the lift limit position where the lift is stopped by the lift stopper 12 as described above, the receiving frames 13a and 13b of the traversing vehicle supports 2A and 2B and the corresponding frames 13a and 13b are lifted. Since a gap is also formed between the upper and lower vehicle supports 1B and 1C, the traversing vehicle support 2A is traversed to a position directly below the ascending and descending vehicle support 1A in such a state (or both the traversing vehicle supports 2A and 2B). To the position just below the lift vehicle support 1A, 1B) to secure an empty space at the entrance / exit level N just below the work target lift vehicle support 1B (or 1C). The take-up drum 7 is driven in the reverse direction to pull out the hanging cable 6, the lifting / lowering vehicle support base 1B (or 1C) to be worked is hung down to the loading / unloading level N, and the descent limit stopper (traverse of the traversing vehicle support bases 2A, 2B). Together causes received by the guide rail 3), the other lifting vehicle support base, transverse vehicle support base 2A, receiving frame 13a on 2B, it causes received by upper support level U at 13b. In other words, in the initial state described above, the vehicle travels by itself with respect to the ascending / descending vehicle support 1B (or 1C) and the two traversing vehicle supports 2A and 2B located at the entry / exit level N. Loading and unloading work.
[0026]
As described above, when all the ascending and descending vehicle supports 1A to 1C reach the descent limit position where they cannot be further lowered and are in the initial state, the movable body 17 to be detected is moved to the descent limit detection sensor as described above. Since the ON operation is performed upon detection of S1, the reverse rotation drive of the winding drum 7 is automatically stopped based on the ON operation of the sensor S1 for detecting the lower limit.
[0027]
In addition, as shown by a virtual line in FIG. 1, the sensor S2 for detecting the limit of rising can be omitted. In this case, a sensor for individually detecting a state in which each of the ascending and descending vehicle supports 1A to 1C has reached the ascending limit position which is stopped by the ascending limit stopper 12 is provided on the fixed frame side. When all of the ascending limit detection sensors of each of the ascending and descending vehicle support bases 1A to 1C are turned ON, for example, by connecting the ascending limit detecting sensors of every 1C in series, the forward drive of the winding drum 7 is performed. You may comprise so that it may stop automatically.
[0028]
In the above embodiment, the hanging rope tension detecting device of the present invention is a tension detecting device of a lifting drive lifting rope of the upper lifting vehicle support pedestal that moves up and down between the entrance / exit level N and the upper supporting level U above this. Although it was used, it can also be used as a tension detecting device for a hanging cable for raising and lowering a lower lift vehicle support platform that moves up and down between a loading / unloading level and a lower support level lower than the lower level. The present invention can also be used as a tension detecting device for a suspension cable that drives the vehicle support base and the lower elevating vehicle support base up and down collectively. Further, the method of suspending each of the lifting vehicle supports by the suspension cable (the method of hanging the suspension cable) and the means for pulling in and out the suspension are not limited to those of the above-described embodiment. Therefore, of course, the linking structure of the hanging cable with respect to the tension detecting device of the present invention is not limited to the structure in which the terminal of the hanging cable is directly biased in the direction of tension as shown in the above embodiment. A configuration in which the intermediate portion of the suspension cable is urged in the tension direction through a ring may be used, or one suspension cable may be folded back to form a double suspension cable. In the hanging configuration, a configuration may be used in which the one-end folded portion of the hanging cable is urged in the tension direction via a rotary guide wheel.
[0029]
【The invention's effect】
The present invention can be implemented and used as described above, and according to the hanging rope tension detecting device for parking equipment of the present invention, the lifting rope for driving the lifting vehicle support base up and down is moved in the tension direction. Two types of springs, a strong spring and a weak spring, are used as biasing springs, and in a state where a heavy load such as the lifting / lowering vehicle support base or a mounted vehicle is acting on the hanging cable, the strong spring receives the large load. In the state where the load on the lifting vehicle support base side is not acting on the suspension cable, the suspension cable is urged in the tension direction by the weak spring. Therefore, when the large load is received by one weak spring. Although it is possible to reduce the size of the device in comparison, immediately after the lifting platform has been lowered to the lower limit by pulling out the hanging cable, etc., it is affected by a large amount of deformation due to the elastic return of the weak spring. Movable body for detection Is largely displaced, the elevator car support base lowermost detection like easily and reliably performed to it as possible. Therefore, it is easy to adjust the mounting position of the sensor that performs the detection of the lowering limit of the elevating vehicle support, and the like, and it is possible to reliably detect the lowering limit of the elevating vehicle support.
[0030]
According to the second aspect of the present invention, the state in which the elevating vehicle support reaches the lower limit and the state in which the elevating vehicle support reaches the upper limit (the state immediately after the elevating vehicle support reaches the upper limit) And / or any of the following states of excessive pulling of the suspension cable) can be automatically detected.
[0031]
According to the third aspect of the present invention, since the deformation limit of the weak spring against the elasticity of the weak spring can be determined by the spring deformation limiting member, a large load is applied in the deformation limit state of the weak spring itself. As in the case, the breakage of the weak spring can be prevented, and the safety can be enhanced.
[0032]
Furthermore, according to the configuration described in claim 4 or claim 5, the device can be easily configured by arranging a strong spring and a weak spring in series.
[Brief description of the drawings]
FIG. 1A is a schematic rear view showing the configuration of the entire parking facility, and FIG. 1B is a plan view showing an embodiment of a hanging rope tension detecting device according to the present invention.
FIG. 2 is a perspective view illustrating a lifting drive unit of each lifting vehicle support base.
3 is a longitudinal sectional side view for explaining an operation state of the hanging rope tension detecting device shown in FIG. 1B, wherein FIG. 3A shows a state in which a lifting and lowering vehicle support has reached a lower limit, and FIG. Fig. C shows a state in which the table is suspended, and Fig. C shows a state in which the suspension cable is pulled in too much.
FIG. 4 is a side view illustrating a sensor mounting structure of the hanging rope tension detecting device shown in FIG. 1B.
[Explanation of symbols]
1A to 1C Elevating vehicle support 2A, 2B Traversing vehicle support 3 Traversing guide rail 6 Suspension cable 7 Winding drum (suspending indexing feeding means)
Reference Signs 8 Motor 9 Suspension rope tension detecting devices 10a to 10c Suspended rotation guide wheels 11a to 11c Suspended rotation guide wheels (two coaxial links)
12 Limiting stoppers 13a, 13b Receiving frame 15 Fixed spring receiving seat 16 Rod 17 Detectable movable body 18 Spring receiving seat 19 Guide sleeve 20 Load transmitting member 21 Weak compression coil spring 22 Spring deformation limiting member 23 Strong compression coil spring S1 ~ S3 Sensor U Upper support level N Entry / exit level (Lower support level)
