JP3618043B2

JP3618043B2 - Belt tension adjuster

Info

Publication number: JP3618043B2
Application number: JP35946197A
Authority: JP
Inventors: 安弘西江; 健谷水; 隆一上田
Original assignee: Daihatsu Diesel Manufacturing Co Ltd
Current assignee: Daihatsu Infinearth Mfg Co Ltd
Priority date: 1997-03-26
Filing date: 1997-12-26
Publication date: 2005-02-09
Anticipated expiration: 2017-12-26
Also published as: JPH10325451A

Description

【０００１】
【発明の属する技術分野】
本発明は、一対の歯付プーリに巻き付けて張架され、一端および他端が例えば扉を吊るす戸車付き等のブラケットに固定される歯付ベルトの張力を調整するベルト張り調整装置に関する。
【０００２】
【従来の技術】
従来、吊り扉として、例えば図５に示すようなものが知られている。この吊り扉は、開口部５１の上縁に沿って水平に設けられたレール５２上を走行する１対の戸車５３,５４を支承する各ブラケット５５,５６に扉５７の上部一端と他端を吊り下げるとともに、開口部５１の上方両側付近の壁に枢着され、一方がモータ５９で駆動される１対の歯付プーリ５８a,５８bに歯付ベルト６０を巻き付けて張架し、この歯付ベルト６０の一端６０aと他端６０bを左側のブラケット５５に固定して、扉５７を開閉動作させるようにしている。
【０００３】
上記歯付ベルトの両端６０a,６０bとブラケット５５の固定部は、図６に示すように、ボルト６１,６１で一端がブラケット５５の上部に固定される板状部材６２の中間に取り付けられたＬ金具６３の上辺に、歯付ベルトの一端６０aの歯に噛合させた押さえ金具６４をボルト６５,６５で固定する一方、Ｌ状部材６６の上辺に同様の押さえ金具６７とボルト６８,６８により歯付ベルトの他端６０bを固定し、Ｌ状部材６６の垂直辺に固定したナット６９に螺合した寸切りボルト７０の先端を、上記板状部材６２の他端の折曲辺の穴に挿通し,両側からナット７１,７２で締め付けるようになっている。
歯付ベルト６０の張力の調整は、歯付ベルトの一端６０aが固定された板状部材６２の他端のナット７１,７２を緩め、寸切りボルト７０とＬ状部材６６を介して歯付ベルトの他端６０bを押し,引きしてベルトの張り具合を適正に調整した後、再びナット７１,７２を締め付けて行なわれる。
【０００４】
【発明が解決しようとする課題】
ところが、上記従来のベルト張り調整装置は、Ｌ金具６３,押さえ金具６４,折曲辺のナット７１,７２や寸切りボルト７０および多くのボルト６１,６５をもつベルト一端６０a側の板状部材と、押さえ金具６７,ボルト６８,ナット６９をもつベルト他端６０b側のＬ状部材６６とからなるため、部品点数が増えて高価になるという問題がある。また、張力の調整を、ブラケット５５から離れたＬ状部材６６との間隔を寸切りボルト７０の締付ナット７１,７２による長さ調整で行なうため、梯子を用いた高所作業であることも加わって作業性が悪く、ベルト他端６０bが一端６０aに対して傾いてベルト歯面が揃わないという問題もある。
一方、他の従来例として、従動側の歯付プーリ５８aの中心軸を水平方向に移動調整できるようにしたベルト張り調整装置もあるが、構成部品が高価になるうえ、歯付プーリ５８a付近にスペースが必要になり、また、歯付プーリ５８aがブラケット５５から離れているため、扉取付と同時にベルト張力調整ができないという問題がある。
【０００５】
そこで、本発明の目的は、構造をブラケットに組み込めるコンパクトなものに工夫することによって、部品点数が少なく、スペースを要さず、しかも作業性の良い安価なベルト張り調整装置を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明は、一対の歯付プーリに巻き付けて張架され、一端および他端がブラケットに固定される歯付ベルトの張力を調整するベルト張り調整装置において、上記歯付ベルトの一端に噛合させる歯を有する溝にこの歯付ベルトの一端を嵌め込んで固定する固定部と、この固定部に連なり、上記歯付ベルトの他端付近の外周を案内するＵ字状をなすＵ字状案内部とを有して、上記ブラケットに固定される固定具と、上記Ｕ字状案内部の内部に配置されるように上記固定具に回動自在に取り付けられて、上記歯付ベルトの他端に噛合する歯付プーリと、この歯付プーリの中心穴に挿入され、この歯付プーリを上記固定具に固定する締付具とを備え、上記歯付プーリは、軸部の最外端がレンチが嵌合しうる多角形をなすとともに、上記歯付プーリが傾くことを阻止すべく上記多角形の内側の軸部に当接する当接片が、上記Ｕ字案内部の内側に位置するように上記固定具に設けられていることを特徴とする。
【０００７】
ブラケットには、ベルト張り調整装置の固定具が固定され、この固定具の固定部に、一対の歯付プーリに巻き付けて張架された歯付ベルトの一端をまず噛合させて固定し、次いで上記歯付ベルトの他端付近を、上記固定具のＵ字状案内部に外周を案内させつつ、Ｕ字状案内部の内部の固定具に回動自在に取り付けられた歯付プーリに噛合させてから、この歯付プーリをベルトが適正張力になるまで回転させる。つまり、歯付プーリに歯付ベルトの他端を噛合させた後、歯付プーリの最外端の多角形にレンチを嵌合して回す。すると、歯付ベルトに加わる張力で傾こうとする歯付プーリは、その軸部が当接片に当たって傾きが阻止されるから、歯付ベルトを容易に張り、また歯付ベルトの張力を容易に調整することができる。その後、歯付プーリを締付具によって上記固定具に固定する。これにより、張架された歯付ベルトは、適正な張力に調整されて両端がブラケットに固定されることになる。なお、歯付ベルトの張力を減じる場合は、締付具を緩めてから、歯付プーリをベルトが適正張力になるまで逆回転させた後、再び締付具を締め付ければよい。
このように、上記ベルト張り調整装置は、固定部と締付具付きの歯付プーリを内部に枢着したＵ字状案内部とからなる固定具をブラケットに固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、螺合した２重ナットで寸切りボルトの長さを調整するなどの従来例に比して、ベルト両端の歯面も揃い、軸部の最外端が多角形で内側に当接片をもつ歯付プーリと相俟って、ベルト張り調整作業が一層容易になる。
【０００８】
請求項２の発明は、一対の歯付プーリに巻き付けて張架され、一端および他端がブラケットに固定される歯付ベルトの張力を調整するベルト張り調整装置において、上記歯付ベルトの一端を案内する第１凹部と、この第１凹部に連なり、上記歯付ベルトの他端付近の外周を案内するＵ字状をなすＵ字状案内部とを有して、上記ブラケットに固定される固定具と、上記Ｕ字状案内部の内部に配置されるように上記固定具に回動自在に取り付けられて、上記歯付ベルトの他端に噛合する歯付プーリと、この歯付プーリの中心穴に挿入され、この歯付プーリを上記固定具に固定する締付具と、上記歯付ベルトの一端に噛合させる歯を有して、この歯付ベルトの一端を嵌め込んで固定するとともに、上記第１凹部内に摺動自在に収容された第１摺動ブロックと、この第１摺動ブロックと上記第１凹部の一端との間に縮装された弾性部材と、上記第１摺動ブロックを第１凹部内の所定位置に位置するように上記固定具に固定する固定部材とを備え、上記歯付プーリは、軸部の最外端がレンチが嵌合しうる多角形をなすとともに、上記歯付プーリが傾くことを阻止すべく上記多角形の内側の軸部に当接する当接片が、上記Ｕ字案内部の内側に位置するように上記固定具に設けられていることを特徴とする。
【０００９】
ブラケットには、ベルト張り調整装置の固定具が固定され、この固定具の第１凹部内の第１摺動ブロックに、一対の歯付プーリに張架された歯付ベルトの一端をまず噛合させ、次いで上記歯付ベルトの他端付近を、上記固定具のＵ字状案内部に外周を案内させつつ、Ｕ字状案内部の内部の歯付プーリに噛合させてから、この歯付プーリを、ベルトが適正張力になるまで回転させる。つまり、歯付プーリに歯付ベルトの他端を噛合させた後、歯付プーリの最外端の多角形にレンチを嵌合して回す。すると、歯付ベルトに加わる張力で傾こうとする歯付プーリは、その軸部が当接片に当たって傾きが阻止されるから、歯付ベルトを容易に張り、また歯付ベルトの張力を容易に調整することができる。歯付プーリの回転に伴って、歯付ベルトが次第に張られ、第１摺動ブロックが弾性部材を押し縮めつつ第１凹部の一端に向かって移動し、歯付ベルトには、弾性部材の当初の圧縮力に縮まった長さとばね定数の積を加えた張力が作用する。そこで、第１摺動ブロックが所望の張力に対応する第１凹部内の所定位置まで移動したとき、歯付プーリを締付具によって、また第１摺動ブロックを固定部材によって夫々固定具に固定する。かくて、張架された歯付ベルトは、上記所望の張力に調整されて両端がブラケットに固定されることになる。
このように、上記ベルト張り調整装置は、第１摺動ブロック,弾性部材,固定部材をもつ第１凹部と、締付具付きの歯付プーリを内部に枢着したＵ字状案内部とからなる固定具をブラケットに固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、寸切りボルトを長さ調整するなどの従来例に比して、ベルト両端の歯面も揃い、張力の調整作業が容易である。さらに、第１摺動ブロックの一端側に縮装した弾性部材によって、容易かつ確実に所望の一定張力を歯付ベルトに加えることができるとともに、軸部の最外端が多角形で内側に当接片をもつ歯付プーリによって、ベルト張り調整作業が一層容易になる。
【００１０】
請求項３の発明は、一対の歯付プーリに巻き付けて張架され、一端および他端がブラケットに固定される歯付ベルトの張力を調整するベルト張り調整装置において、水平に延在し、上記歯付ベルトの一端に噛合させる歯が上部に形成された溝に上記歯付ベルトの一端を表側から嵌め込んで座金付きボルトで抜け止めして固定する固定部と、この固定部の上方に平行に連なり、表側が全面に亙って、他端が上記歯付きベルトの高さだけ夫々開いた溝穴をなして、上記歯付ベルトの他端を案内する第２凹部と、この第２凹部の両端から前方に突出するフランジ部とを有して、上記ブラケットに固定される固定具と、上記歯付ベルトの他端に噛合させる歯と歯付ベルトの抜けを防止する板状突起とを下面に有し、前方に突出するとともに、上記第２凹部に摺動自在に収容された第２摺動ブロックと、上記フランジ部の取付穴に挿通され、上記第２摺動ブロックに貫設されたねじ穴に螺合され、上記フランジ部を挟む首下にロックナットを有して、上記第２摺動ブロックを進退させる送りボルトとを備えたことを特徴とする。
【００１１】
ブラケットには、ベルト張り調整装置の固定具が固定され、この固定具の固定部に、一対の歯付プーリに張架された歯付ベルトの一端をまず噛合させて固定し、次いで歯付ベルトの他端を、上記固定具の第２凹部内の第２摺動ブロックに噛合させてから、この第２摺動ブロックを、この第２摺動ブロックに螺合し,固定具のフランジ部に挿通した送りボルトの回転で進退させて、ベルトを適正張力に調整し、調整位置にロックナットで固定する。これにより、張架された歯付ベルトは、適正な張力に調整されてブラケットに両端が固定されることになる。
このように、上記ベルト張り調整装置は、固定部と第２摺動ブロック,送りボルトを挿通したフランジ部,第２凹部とからなる固定具をブラケットに固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、寸切りボルトを長さ調整するなどの従来例に比して、ベルト両端の歯面も揃い、張力の調整作業が容易である。さらに、第２凹部の両端から前方に突出するフランジ部に挿通され,前方に突出する第２摺動ブロックの貫通ねじ穴に螺合された送りボルトは、歯付ベルトやブラケットよりも前方に位置するので、送りボルトやロックナットをレンチ等で容易に回わせて、ベルト張力の調整作業が一層容易化する。
【００１２】
【発明の実施の形態】
以下、本発明を図示の実施の形態により詳細に説明する。
図１(Ａ),(Ｂ),(Ｃ)は、本発明の請求項１のベルト張り調整装置の一例を示す正面図,側面図,平面図であり、この調整装置は、歯付ベルト６０の一端６０aに噛合させる歯を有してこの一端６０aを固定する固定部２と、この固定部２に連なり、上記歯付ベルト６０の他端６０b付近の外周を案内するＵ字状をなすＵ字状案内部３とを有して、戸車５３(図５参照)を支承するブラケット５５の上部にボルト４,４で固定される固定具１と、Ｕ字状案内部３の内部に配置されるように上記固定具１に回動自在に取り付けられて、歯付ベルトの他端６０bに噛合する歯付プーリ５と、この歯付プーリ５を固定具１に固定する締付具としての締付ボルト６を備えている。
【００１３】
上記固定部２は、固定具１の一端からＵ字状案内部３の下部に沿って略水平に延びる溝をなし、表側から歯付ベルトの一端６０aが嵌め込まれて溝の一端側のみに設けられた歯と噛合し、歯付ベルトの溝からの抜けを一端側に螺着した座金付きボルト７で防止している。
上記歯付プーリ５は、歯付ベルトに噛合する歯が設けられた歯車部５aと、この歯車部５aの歯先と略同径の円をなして軸方向外側に連なる軸部５bと、レンチが嵌合しうる軸方向最外端の六角部５cからなり、中心穴５ｄに挿通した上記締付ボルト６を裏面壁に螺着して固定具１に取り付けられる。
【００１４】
一方、歯先ベルト６０を張る際に歯付プーリ５が傾くのを阻止するために、上記円形断面の軸部５bに当接する当接片８を、固定具１の他端に外方へ水平に開いた上記Ｕ字状案内部３の内部中心に水平に位置するように、固定具１の裏面壁から突設するとともに、歯付プーリ５に巻き付けた後の歯付ベルトの他端６０bを、上記当接片８の水平部に向けて押し付けて固定する固定ボルト９をＵ字状案内部３の端部に垂直に螺着している。
なお、固定具１をブラケット５５に固定するボルト４,４は、高さ調整を可能にするため、固定具１の垂直方向の長穴１０,１０を通してブラケット５５に螺合される一方、ブラケット５５の裏面には、戸車５３の下方にレール５２の前端下縁に僅かな間隔をおいてしゃくり止め１１を固定して、戸車５３のレール５２からの脱落を防いでいる。また、扉５７は、ブラケット５５の下端水平部にボルト１２で固定される。
【００１５】
上記構成のベルト張り調整装置は、次のように用いられる。
レール５２上を走行する戸車５３を支承し,扉５７を吊り下げたブラケット５５の上部に固定された固定具１の固定部２に、一対の歯付プーリ５８a,５８b(図５参照)に張架された歯付ベルト６０の一端６０aを嵌め込んで噛合させ、座金付きボルト７を螺着して抜け止めをする。次に、締付ボルト６を緩めて歯付プーリ５の六角部５cに図示しないレンチを嵌合して回す。すると、レンチを回すに伴って歯付ベルト６０に加わる張力によって歯付プーリ５は傾こうとするが、その傾きは、軸部５bが当接片８に当たることによって阻止されるので、歯付ベルト６０を適正な張力まで容易に張ることができる。最後に、締付ボルト６を締め付けて、歯付プーリ５を固定具１に確実に固定するとともに、固定ボルト９を締め付けて、歯付ベルトの他端６０bを固定する。これによって、一対の歯付プーリ５８a,５８bに張架された歯付ベルト６０は、適正な張力に調整されて固定具１を介してブラケット５５に両端６０a,６０bを固定されることになる。
なお、歯付ベルト６０の張力を減じる場合は、締付ボルト６と固定ボルト９を緩め、歯付プーリ５の六角部５cに嵌合したレンチを、逆に回わした後、両ボルト６,９を再び締め付ければよい。
【００１６】
このように、上記ベルト張り調整装置は、固定部２と締付ボルト６付きの歯付プーリ５を内部に枢着したＵ字状案内部３とからなる固定具１をブラケット５５に固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、図６の２重ナット７１,７２で寸切りボルト７０の長さを調整するなどの従来例に比して、ベルト両端６０a,６０bの歯面も揃い、張力の調整を容易に行なうことができる。
また、歯付プーリ５に六角部５cを設け、歯付ベルト６０の張りに伴なう歯付プーリ５の傾きを軸部５bへの当接により阻止する当接片８を設けているので、歯付プーリ５による歯付ベルト６０の張力調整が容易にできるとともに、締付具を歯付プーリ５の中心を貫いて固定具１の裏面壁に螺着しているので、歯付プーリ５の固定具１への固定が迅速かつ確実にできるという利点がある。
さらに、歯付ベルト６０の一端６０aの抜けを防止する座金付きボルト７および他端６０bを固定する固定ボルト９を設けているので、ベルト両端６０a,６０bをその歯面を良く揃わせてブラケット５５に確実に固定できるという利点がある。
【００１７】
図２(Ａ),(Ｂ)は、本発明の参考例のベルト張り調整装置の一例を示す正面図,平面図である。この調整装置は、図１で述べた固定具１のＵ字状案内部３を、歯付ベルトの他端６０bを案内する第２凹部１３とし、この第２凹部１３に上記他端６０bに噛合させる歯を有する第２摺動ブロック１４を摺動自在に配置するとともに、この第２摺動ブロック１４を進退させるように固定具１に送りボルト１５を螺合した点のみが図１と異なるので、図１と同じ部材には同一番号を付して説明を省略する。
上記第２凹部１３は、表側が全面に亙り,かつ他端が送りボルト１５の下部でベルト高さだけ夫々開き、かつ第２摺動ブロック１４の突出後部に適合する段付きの水平な溝穴をなし、表側から歯付ベルトの他端６０bが嵌め込めるとともに、他端６０bに噛合する第２摺動ブロック１４の抜けを、上記段付き部の壁に螺着した座金付きボルト１６で防止している。なお、送りボルト１５には、固定具１の他端に当接して第２摺動ブロック１４の上記溝穴内での位置決めを行なうロックナット１７を螺合している。
【００１８】
図２のベルト張り調整装置は、次のように用いられる。
ブラケット５５の上部に固定された固定具１の固定部２に、一対の歯付プーリ５８a,５８b(図５参照)に張架された歯付ベルト６０の一端６０aを嵌め込んで噛合させ、座金付きボルト７を螺着して抜け止めをする。次に、歯付ベルト６０の他端６０bを、固定具１の第２凹部１３内の第２摺動ブロック１４に噛合させつつ嵌め込んでから、ロックナット１７を緩めた送りボルト１５を歯付ベルト６０が適正張力になるまでねじ込んだ後、ロックナット１７を固定具１の他端に締め付ける。これにより、張架された歯付ベルト６０は、適正な張力に調整されてブラケット５５に両端６０a,６０bが固定されることになる。
【００１９】
このように、図２のベルト張り調整装置は、固定部２と第２摺動ブロック１４,送りボルト１５をもつ第２凹部１３とからなる固定具１をブラケット５５に固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、図６の寸切りボルト７０を長さ調整するなどの従来例に比して、ベルト両端６０a,６０bの歯面も揃い、張力の調整を容易に行なうことができる。
また、第２凹部１３の段付き部の壁に座金付きボルト１６を螺着しているので、第２摺動ブロック１４の抜けを防止でき、送りボルト１５にロックナット１７を螺合しているので、第２摺動ブロック１４を溝穴内で確実に位置決めできるという利点がある。
【００２０】
図３(Ａ),(Ｂ)は、本発明の請求項２のベルト張り調整装置の一例を示す正面図,平面図である。この調整装置は、図１の固定具１の固定部２を、歯付ベルト６０の一端６０aを案内する第１凹部１８とし、この第１凹部１８に上記一端６０aに噛合させる歯を有する第１摺動ブロック１９を摺動自在に配置するとともに、この第１摺動ブロック１９と第１凹部１８の一端との間に弾性部材としてのばね２０を縮装し、第１摺動ブロック１９を、第１凹部１８内の所定位置に位置するように固定部材としてのボルト２１,２１で固定具１に固定する点のみが図１と異なるので、図１と同じ部材には同一番号を付して説明を省略する。
【００２１】
上記第１凹部１８は、表側が全面に亙り,かつ一端がベルト高さだけ夫々開いた溝穴をなす一方、上記第１摺動ブロック１９は、ベルトの一端６０aに噛合させる歯およびボルト２１用の２つの挿通穴をもつブロック部１９aと、このブロック部１９aの表側から上記溝穴を摺動自在に覆ってばね２０の脱落を防ぐように一端側へ延びる蓋部１９bとからなる。
そして、第１摺動ブロック１９を、ベルトの一端６０aにブロック部１９aを噛合させつつ、その一端が自由長のばね２０に接するようにして表側から溝穴に嵌め込むと、図中右側の上記挿通穴が、第１凹部１８の裏面壁に設けられた３つの雌ねじ穴２２a,２２ｂ,２２cの右端の雌ねじ穴２２cに揃うようになっている。上記溝穴の下縁には、自由長のばね２０に接して第１摺動ブロック１９を溝穴に嵌め込んだ場合の蓋部１９bの先端位置に、目盛り２３が刻まれるとともに、歯付プーリ５をベルト張り方向に回転させて、第１摺動ブロック１９をばね２０に抗して２つの挿通穴が上記左側２つの雌ねじ穴２２a,２２bに揃うまで一端側へ摺動させたときの蓋部１９bの先端位置にも、目盛り２４が刻まれている。そして、この状態まで圧縮されたばね２０によって、歯付ベルト６０に所定の最適張力が加えられるようになっている。
【００２２】
図３のベルト張り調整装置は、次のように用いられる。
ブラケット５５の上部に固定された固定具１の第１凹部１８の溝穴に、張架された歯付ベルト６０の一端６０aを奥まで挿入し、第１凹部１８の一端に一端を接した自由長のばね２０の他端に第１摺動ブロック１９のブロック部１９aが接触するように、蓋部１９bの先端を目盛り２３に合わせつつベルト一端６０aの歯にブロック部１９bを噛合させながら、第１摺動ブロック１９を溝穴に嵌め込む。次に、図１で述べたと同様に、締付ボルト６を緩めて歯付プーリ５の六角部５cにスパナを嵌合し、歯付プーリ５の傾きを当接片８で阻止しつつ、歯付ベルト６０が適正な張力になるまでスパナを回して歯付プーリ５を回転させる。歯付プーリ５の回転に伴って、歯付ベルト６０が次第に張られ、第１摺動ブロック１９が,ばね２０を押し縮めつつ溝穴の一端に向かって移動し、歯付ベルト６０には、縮まった長さとばね定数の積に相当する張力が加わる。そして、第１摺動ブロック１９が蓋部１９bの先端を目盛り２４に揃わせるまで摺動すると、歯付ベルト６０には所定の最適張力が加わるので、このとき、スパナを外して歯付プーリ５を締付ボルト６の締め付けによって固定具１に固定する。また、一列に揃った雌ねじ穴２２a,２２bへ２本のボルト２１を螺合して、第１摺動ブロック１９を固定具１に固定するとともに、固定ボルト９を締め付けて歯付ベルトの他端６０bを固定する。かくて、張架された歯付ベルト６０は、上記最適張力に調整されて両端６０a,６０bがブラケット５５に固定されることになる。
【００２３】
このように、図３のベルト張り調整装置は、第１摺動ブロック１９,ばね２０,ボルト２１をもつ第１凹部１８と、締付ボルト６付きの歯付プーリ５を内部に枢着しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、図６の寸切りボルト７０を長さ調整するなどの従来例に比して、ベルト両端６０a,６０bの歯面も揃い、張力の調整を容易に行なうことができる。
さらに、第１摺動ブロック１９の一端側にばね２０を縮装しているので、歯付プーリ５の回転に伴って歯付ベルト６０に加わる張力を、ばね２０の縮みによって直ちに知ることができるから、迅速かつ容易に所望の一定張力を歯付ベルト６０に与えることができる。なお、ばね力を知るための目盛りは、溝穴に沿う任意の箇所に刻めることは勿論である。
また、第１摺動ブロック１９に摺動溝穴を覆う蓋部１９bを設けているので、少ない部材で縮装したばね２０および歯付ベルトの一端６０aの脱落を防げるという利点がある。固定ボルト９および歯付プーリの六角部５cと当接片８の利点については、図１で述べたとおりである。
【００２４】
本発明のベルト張り調整装置の参考例は、図示しないが、図２で述べた調整装置の固定部２を、歯付ベルト６０の一端６０aを案内する図３で述べた第１凹部１８で置き換えて得られる。
従って、このベルト張り調整装置も、既に述べたと同様に用いられ、スペースをとらないうえ、部品点数が少なくて安価に製造でき、従来例に比してベルト両端の歯面も揃い、張力の調整作業が容易で、加えて、第１摺動ブロック１９の一端側に縮装したばね２０によって、容易かつ確実に所望の一定張力を歯付ベルト６０に加えることができる。
【００２５】
図４(Ａ),(Ｂ),(Ｃ)は、本発明の請求項３のベルト張り装置の一例を示す正面図,側面図,平面図である。この調整装置は、図２で述べた固定具１に、第２凹部１３の両端から突出するフランジ部３１,３１を付加し、図２の第２摺動ブロック１４を、上記フランジ部３１と同程度に前方へ突出し,下面３２aが歯付ベルトの他端６０bに噛合する歯になった新たな第２摺動ブロック３２とし、図２の送りボルト１５を、上記フランジ部３１,３１の取付穴３３,３３に挿通させ,第２摺動ブロック３２の貫通ねじ穴３４に螺合させ,フランジ部３１を挟む首下にロックナット３５をもつ新たな送りボルト３６とした点のみが図２と異なるので、図２と同じ部材には同一番号を付して説明を省略する。
【００２６】
上記第２凹部１３は、表側(前面)に開いたコ字状断面をなし(図４(Ｂ)参照)、左端が突出するフランジ部３１で遮られ,右端が下部以外を同様のフランジ部３１で遮られるとともに(図４(Ａ),(Ｃ)参照)、下方に歯付ベルトの一端６０aを固定する固定部２が形成されている。一方、上記第２摺動ブロック３２は、図４(Ｂ)に示すように、コ字状の第２凹部１３に嵌合する断面形状を有するとともに、噛合した歯付ベルトの他端６０bの前側面に当接してベルトの抜けを防止し,かつ送りボルト３６との共回りを防止して確実な進退摺動を保証する板状突起３２bを下面３２aに設けている。
なお、歯付ベルトの一端６０aの抜けを防止する座金付きボルト７は、図２の実施の形態のベルトの下縁と異なり上縁の固定部２に取り付けられる。
【００２７】
図４のベルト張り装置は、次のように用いられる。
ブラケット５５の上部に固定された固定具１の固定部２に、一対の歯付プーリ５８a,５８b(図５参照)に張架された歯付ベルト６０の一端６０aを嵌め込んで噛合させ、座金付きボルト７を螺着して抜け止めをする。次に、歯付ベルト６０の他端６０bを第２摺動ブロック３２の下面の歯に噛合させ、図中で左方向に引っ張って歯付ベルト６０を適度に緊張させた状態で、第２摺動ブロック３２をフランジ３１,３１間の第２凹部１３に嵌め込む。続いて、送りボルト３６を、左のフランジ３１の取付穴３３に挿通し,首下にロックナット３５を螺合し、ボルトを締付方向に回しつつその先端を、第２摺動ブロック３２のねじ穴３４に螺合していく。このとき、ベルト張力で右のフランジ３１に当接している第２摺動ブロック３２を手で押さえ付けておくと、送りボルト３６の先端がねじ穴３４の奥に進んでいき、最後に第２摺動ブロック３２を抜けて右のフランジ３１の取付穴３３を貫通する。この時点で手を第２摺動ブロック３２から離し、さらに送りボルト３６を締付方向に回すと、板状突起３２bで共回りを阻止される第２摺動ブロック３２は、第２凹部１３内を左方向に摺動し、歯付ベルト６０がさらに緊張される。そこで、歯付ベルト６０が適正張力になったとき、首下のロックナット３５を左のフランジ３１に密接するまで締め付ける。これにより、張架された歯付ベルト６０は、適正な張力に調整されてブラケット５５に両端６０a,６０bが固定されることになる。
【００２８】
このように、図４のベルト張り調整装置は、固定部２と第２摺動ブロック３２,送りボルト３６を挿通したフランジ部３１,第２凹部１３とからなる固定具１をブラケット５５に固定しただけの簡素な構造なので、スペースをとらないうえ、部品点数が少なくて安価に製造でき、図６の寸切りボルト７０を長さ調整するなどの従来例に比して、ベルト両端の歯面も揃い、張力の調整作業を容易に行なうことができる。
また、第２凹部１３の両端から前方に突出するフランジ部３１,３１に挿通され、前方に突出する第２摺動ブロック３２の貫通ねじ穴３４に螺合された送りボルト３６は、歯付ベルト６０やブラケット５５よりも前方に位置するので(図４(Ｂ)参照)、送りボルト３６やロックナット３５をレンチ等で容易に回わすことができ、歯付ベルト６０の張力調整作業を一層容易に行なうことができる。
さらに、第２摺動ブロック３２の下面３２aに板状突起３２bを設けているので、この板状突起３２bが歯付ベルトの他端６０bの前側面に当接して抜けを防止でき、かつ第２摺動ブロック３２の送りボルト３６との共回りを防止して確実な摺動を保証することができる。加えて、送りボルト３６の首下にロックナット３５を螺合しているので、第２摺動ブロック３２を第２凹部１３内で確実に位置決めすることができる。
【００２９】
なお、本発明の歯付プーリ５を固定具１に固定する締付具は、既述の締付ボルト６に限らず、例えば歯付プーリの中心穴のスプライン溝に嵌合して固定具に固定されるスプライン軸などでもよく、第１摺動ブロック１９の一端側に縮装される弾性部材は、既述のばね２０に限らず、ゴムやエラストマであってもよい。また、第１摺動ブロック１９を固定具１に固定する固定部材は、既述のボルト２１に限らず、クランプなどでもよく、歯付プーリ５の最外端の多角形は、既述の六角形に限られない。
【００３０】
【発明の効果】
以上の説明で明らかなように、請求項１のベルト張り調整装置は、歯付ベルトの一端に噛合させる歯を有する溝にこの歯付ベルトの一端を嵌め込んで固定する固定部と、この固定部に連なり、上記歯付ベルトの他端付近の外周を案内するＵ字状をなすＵ字状案内部とを有して、上記ブラケットに固定される固定具と、上記Ｕ字状案内部の内部に配置されるように上記固定具に回動自在に取り付けられて、上記歯付ベルトの他端に噛合する歯付プーリと、この歯付プーリの中心穴に挿入され、この歯付プーリを上記固定具に固定する締付具とを備え、上記歯付プーリは、軸部の最外端がレンチが嵌合しうる多角形をなすとともに、上記歯付プーリが傾くことを阻止すべく上記多角形の内側の軸部に当接する当接片が、上記Ｕ字案内部の内側に位置するように上記固定具に設けられているので、スペースをとらず、部品点数が少なくて安価に製造でき、従来例に比してベルト両端の歯面も揃い、張力を容易に調整することができる。
【００３１】
請求項２のベルト張り調整装置は、請求項１のベルト張り調整装置の固定具の固定部を、上記歯付ベルトの一端を案内する第１凹部とし、この第１凹部内に歯付ベルトの一端に噛合させる歯を有する第１摺動ブロックを摺動自在に配置するとともに、この第１摺動ブロックと上記第１凹部の一端との間に弾性部材を縮装し、上記第１摺動ブロックを、第１凹部内の所定位置に位置するように固定部材により上記固定具に固定するようにしているので、スペースをとらず、部品点数が少なくて安価に製造でき、従来例に比してベルト両端の歯面も揃い、張力を容易に調整することができ、加えて、弾性部材によって容易かつ確実に所望の一定張力を与えることができる。
【００３２】
請求項３のベルト張り調整装置は、水平に延在し、上記歯付ベルトの一端に噛合させる歯が上部に形成された溝に上記歯付ベルトの一端を表側から嵌め込んで座金付きボルトで抜け止めして固定する固定部と、この固定部の上方に平行に連なり、表側が全面に亙って、他端が上記歯付きベルトの高さだけ夫々開いた溝穴をなして、上記歯付ベルトの他端を案内する第２凹部と、この第２凹部の両端から前方に突出するフランジ部とを有して、上記ブラケットに固定される固定具と、上記歯付ベルトの他端に噛合させる歯と歯付ベルトの抜けを防止する板状突起とを下面に有し、前方に突出するとともに、上記第２凹部に摺動自在に収容された第２摺動ブロックと、上記フランジ部の取付穴に挿通され、上記第２摺動ブロックに貫設されたねじ穴に螺合され、上記フランジ部を挟む首下にロックナットを有して、上記第２摺動ブロックを進退させる送りボルトとを備えているので、スペースをとらず、部品点数が少なくて安価に製造でき、従来例に比してベルト両端の歯面も揃い、張力を容易に調整でき、加えて、送りボルトやロックナットが前方に位置して容易に回せるから、ベルト張力の調整作業を一層容易にすることができる。
【図面の簡単な説明】
【図１】図１(Ａ)は、本発明の請求項１のベルト張り調整装置の一例を示す正面図、図１(Ｂ)は、図１(Ａ)のｂ-ｂ線に沿う断面図、図１(Ｃ)は、図１(Ａ)のｃ-ｃ線に沿う断面図である。
【図２】本発明の参考例のベルト張り調整装置の一例を示す正面図および平面図である。
【図３】図３(Ａ)は、本発明の請求項２のベルト張り調整装置の一例を示す正面図、図３(Ｂ)は、図３(Ａ)のｂ-ｂ線に沿う断面図である。
【図４】図４(Ａ)は、本発明の請求項３のベルト張り装置の一例を示す正面図、図４(Ｂ)は、図４(Ａ)のｂ-ｂ線に沿う断面図、図４(Ｃ)は、上記ベルト張り装置の平面図である。
【図５】従来のベルトで駆動される吊り扉の全体を示す正面図である。
【図６】図５のＶ部を拡大した正面図および側面図である。
【符号の説明】
１…固定具、２…固定部、３…Ｕ字状案内部、５…歯付プーリ、
５b…軸部、５c…六角部、６…締付ボルト、８…当接片、１３…第２凹部、
１４…第２摺動ブロック、１５…送りボルト、１８…第１凹部、
１９…第１摺動ブロック、２０…ばね、２１…ボルト、
２２a〜２２c…雌ねじ穴、２３,２４…目盛り、５１…開口部、
５２…レール、５３…戸車、５５…ブラケット、５７…扉、
５８a,５８b…歯付プーリ、６０…歯付ベルト、６０a…一端、６０b…他端。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and is fixed to a bracket such as a door pulley that suspends a door at one end and the other end.
[0002]
[Prior art]
Conventionally, as a hanging door, for example, the one shown in FIG. 5 is known. The suspension door has an upper end and an other end of the door 57 on brackets 55 and 56 that support a pair of door wheels 53 and 54 that run on a rail 52 provided horizontally along the upper edge of the opening 51. In addition to being suspended, the toothed belt 60 is wound around a pair of toothed pulleys 58a and 58b which are pivotally attached to the wall near the upper side of the opening 51, and one of which is driven by the motor 59. One end 60a and the other end 60b of the belt 60 are fixed to the left bracket 55 so that the door 57 is opened and closed.
[0003]
As shown in FIG. 6, the fixing portion between the both ends 60 a and 60 b of the toothed belt and the bracket 55 is L attached to the middle of a plate-like member 62 whose one end is fixed to the upper portion of the bracket 55 with bolts 61 and 61. On the upper side of the metal fitting 63, a holding metal fitting 64 meshed with the teeth of one end 60a of the toothed belt is fixed with bolts 65, 65, and on the upper side of the L-shaped member 66, a similar metal fitting 67 and bolts 68, 68 are used for toothing. The other end 60b of the attached belt is fixed, and the tip of the cutting bolt 70 screwed into the nut 69 fixed to the vertical side of the L-shaped member 66 is inserted into the hole of the bent side at the other end of the plate-shaped member 62. However, the nuts 71 and 72 are tightened from both sides.
The tension of the toothed belt 60 is adjusted by loosening the nuts 71 and 72 at the other end of the plate-like member 62 to which the one end 60 a of the toothed belt is fixed, and via the cutting bolt 70 and the L-shaped member 66. After the other end 60b of the belt is pushed and pulled to adjust the belt tension properly, the nuts 71 and 72 are tightened again.
[0004]
[Problems to be solved by the invention]
However, the conventional belt tension adjusting device includes a plate member on the belt one end 60a side having an L metal fitting 63, a holding metal fitting 64, bent side nuts 71 and 72, dimensioning bolts 70, and many bolts 61 and 65. Further, since it is composed of the L-shaped member 66 on the belt other end 60b side having the holding metal fitting 67, the bolt 68, and the nut 69, there is a problem that the number of parts increases and the cost becomes high. Further, since the tension is adjusted by adjusting the length of the slicing bolt 70 with the tightening nuts 71 and 72 with respect to the L-shaped member 66 away from the bracket 55, the work may be performed at a high place using a ladder. In addition, workability is poor, and there is a problem that the belt other end 60b is inclined with respect to the one end 60a and the belt tooth surface is not aligned.
On the other hand, as another conventional example, there is a belt tension adjusting device that can move and adjust the central axis of the driven-side toothed pulley 58a in the horizontal direction. Since space is required and the toothed pulley 58a is separated from the bracket 55, there is a problem that belt tension cannot be adjusted simultaneously with the door mounting.
[0005]
Accordingly, an object of the present invention is to provide an inexpensive belt tension adjusting device that has a small number of parts, requires no space, and has good workability by devising a compact structure that can be incorporated into a bracket. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and has one end and the other end fixed to a bracket. A fixing portion that fits and fixes one end of the toothed belt in a groove having teeth meshed with one end of the toothed belt, and a U that is connected to the fixing portion and guides an outer periphery near the other end of the toothed belt. A U-shaped guide portion having a letter shape, and a fixture that is fixed to the bracket, and is rotatably attached to the fixture so as to be disposed inside the U-shaped guide portion. A toothed pulley that meshes with the other end of the toothed belt, and a fastener that is inserted into the center hole of the toothed pulley and fixes the toothed pulley to the fixing tool.The toothed pulley has a polygon in which the outermost end of the shaft portion can be fitted with a wrench, and abuts against the shaft portion inside the polygon to prevent the toothed pulley from tilting. A piece is provided on the fixture so as to be positioned inside the U-shaped guide.It is characterized by that.
[0007]
The bracket is fixed with a fixing device of a belt tension adjusting device, and one end of a toothed belt wound around a pair of toothed pulleys is first meshed and fixed to the fixing portion of the fixing device, The vicinity of the other end of the toothed belt is engaged with a toothed pulley that is rotatably attached to a fixing tool inside the U-shaped guide part while guiding the outer periphery to the U-shaped guide part of the fixing tool. Rotate this toothed pulley until the belt is at the proper tension.The That is, after the other end of the toothed belt is engaged with the toothed pulley, the wrench is fitted to the outermost polygon of the toothed pulley and turned. Then, the toothed pulley that tries to tilt with the tension applied to the toothed belt is prevented from tilting because its shaft part hits the contact piece, so that the toothed belt can be easily stretched and the tension of the toothed belt can be easily increased. Can be adjusted. after thatThen, the toothed pulley is fixed to the fixing tool by a fastening tool. Accordingly, the tensioned toothed belt is adjusted to an appropriate tension and both ends are fixed to the bracket. In order to reduce the tension of the toothed belt, after loosening the fastening tool, the toothed pulley is rotated in reverse until the belt has an appropriate tension, and then the fastening tool is tightened again.
As described above, the belt tension adjusting device has a simple structure in which a fixing device including a fixing portion and a U-shaped guide portion pivotally attached to a toothed pulley with a fastening device is simply fixed to a bracket. Compared to the conventional example where space is not required, the number of parts is small, and it can be manufactured at low cost, and the length of the cutting bolt is adjusted with a screwed double nut, the tooth surfaces on both ends of the belt are aligned.Combined with a toothed pulley having an outermost end of the shaft portion that is polygonal and has an abutting piece on the inner side, the belt tension adjustment work is further facilitated.
[0008]
According to a second aspect of the present invention, there is provided a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and has one end and the other end fixed to a bracket. A fixed portion fixed to the bracket, having a first recessed portion for guiding and a U-shaped guide portion that is connected to the first recessed portion and guides the outer periphery in the vicinity of the other end of the toothed belt. A toothed pulley that is rotatably attached to the fixture so as to be disposed inside the U-shaped guide, and meshes with the other end of the toothed belt, and a center of the toothed pulley. A fastener that is inserted into the hole and that fixes the toothed pulley to the fixing tool and a tooth that meshes with one end of the toothed belt, and is fitted and fixed at one end of the toothed belt; A first sliding block slidably accommodated in the first recess. And an elastic member that is shrunk between the first sliding block and one end of the first recess, and the first sliding block is fixed at a predetermined position in the first recess. A fixing member for fixing to the toolThe toothed pulley has a polygon in which the outermost end of the shaft portion can be fitted with a wrench, and abuts against the shaft portion inside the polygon to prevent the toothed pulley from tilting. A piece is provided on the fixture so as to be positioned inside the U-shaped guide.It is characterized by that.
[0009]
A fixing tool of the belt tension adjusting device is fixed to the bracket, and one end of the toothed belt stretched between the pair of toothed pulleys is first meshed with the first sliding block in the first recess of the fixing tool. Next, the vicinity of the other end of the toothed belt is engaged with a toothed pulley inside the U-shaped guide part while guiding the outer periphery to the U-shaped guide part of the fixture, Rotate the belt until the proper tension is reached.That is, after the other end of the toothed belt is engaged with the toothed pulley, the wrench is fitted to the outermost polygon of the toothed pulley and turned. Then, the toothed pulley that tries to tilt with the tension applied to the toothed belt is prevented from tilting because its shaft part hits the contact piece, so that the toothed belt can be easily stretched and the tension of the toothed belt can be easily increased. Can be adjusted.As the toothed pulley rotates, the toothed belt is gradually stretched, and the first sliding block moves toward one end of the first recess while compressing and shrinking the elastic member. The tension obtained by adding the product of the contracted length and the spring constant acts on the compression force. Therefore, when the first sliding block moves to a predetermined position in the first recess corresponding to the desired tension, the toothed pulley is fixed to the fixing tool by the fastening tool, and the first sliding block is fixed to the fixing tool by the fixing member. To do. Thus, the stretched toothed belt is adjusted to the desired tension and both ends are fixed to the bracket.
As described above, the belt tension adjusting device includes a first recess having a first sliding block, an elastic member, and a fixing member, and a U-shaped guide portion pivotally attached to a toothed pulley with a fastener. Because it has a simple structure in which the fixture is simply fixed to the bracket, it does not take up space, it can be manufactured at a low cost with a small number of parts, and both ends of the belt can be adjusted compared to conventional examples such as adjusting the length of the cutting bolt. The tooth surfaces are aligned and tension adjustment work is easy. Furthermore, a desired constant tension can be easily and surely applied to the toothed belt by the elastic member that is fitted to one end of the first sliding block.At the same time, the belt tension adjustment work is further facilitated by the toothed pulley having a polygonal outermost end of the shaft portion and an inner contact piece.
[0010]
The invention according to claim 3 is a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and has one end and the other end fixed to a bracket. Teeth meshed with one end of toothed beltAbove the groove formed on the topA fixed part that fits one end of the toothed belt from the front side and prevents it from being fixed with a bolt with a washer, and is connected in parallel to the upper part of the fixed part. Each of the second recesses for guiding the other end of the toothed belt and flanges projecting forward from both ends of the second recesses. A fixing tool to be fixed, a tooth to be engaged with the other end of the toothed belt, and a plate-like protrusion for preventing the toothed belt from coming off are provided on the lower surface, protrude forward, and slide into the second recess. A freely-slidable second sliding block and a nut inserted through the mounting hole of the flange portion, screwed into a screw hole penetrating the second sliding block, and below the neck sandwiching the flange portion A feed bolt for advancing and retracting the second sliding block; Characterized by comprising.
[0011]
The bracket is fixed with a fixing device of a belt tension adjusting device, and one end of a toothed belt stretched between a pair of toothed pulleys is first meshed with the fixing portion of the fixing device, and then the toothed belt is fixed. After engaging the other end of the second sliding block with the second sliding block in the second concave portion of the fixture, the second sliding block is screwed into the second sliding block, and the flange portion of the fixture is fitted. The belt is advanced and retracted by the rotation of the inserted feed bolt, the belt is adjusted to the appropriate tension, and fixed at the adjustment position with a lock nut. Thus, the tensioned toothed belt is adjusted to an appropriate tension and both ends are fixed to the bracket.
As described above, the belt tension adjusting device has a simple structure in which the fixing member including the fixing portion, the second sliding block, the flange portion through which the feed bolt is inserted, and the second concave portion is simply fixed to the bracket. In addition, since the number of parts is small, it can be manufactured at low cost, and the tooth surfaces on both ends of the belt are aligned, making it easier to adjust the tension, compared to conventional examples such as adjusting the length of a dimensioning bolt. Further, the feed bolt inserted through the flange portion protruding forward from both ends of the second recess and screwed into the through screw hole of the second sliding block protruding forward is positioned forward of the toothed belt or bracket. As a result, the belt tension can be easily adjusted by turning the feed bolt and lock nut with a wrench.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
1 (A), (B), (C) are the claims of the present invention.1FIG. 2 is a front view, a side view, and a plan view showing an example of a belt tension adjusting device of the present invention, and this adjusting device has a tooth that meshes with one end 60a of a toothed belt 60 and a fixing portion 2 that fixes the one end 60a. It has a U-shaped guide portion 3 that is continuous with the fixed portion 2 and guides the outer periphery of the toothed belt 60 in the vicinity of the other end 60b, and supports the door wheel 53 (see FIG. 5). A fixing device 1 fixed to the upper part of the bracket 55 with bolts 4 and 4 and a rotating device attached to the fixing device 1 so as to be disposed inside the U-shaped guide portion 3. A toothed pulley 5 meshing with the end 60b and a fastening bolt 6 as a fastening tool for fixing the toothed pulley 5 to the fixing tool 1 are provided.
[0013]
The fixing portion 2 has a groove extending substantially horizontally from one end of the fixture 1 along the lower portion of the U-shaped guide portion 3, and is provided only on one end side of the groove by fitting one end 60a of the toothed belt from the front side. The toothed belt 7 is prevented from coming off from the groove by a washer bolt 7 screwed to one end.
The toothed pulley 5 includes a gear portion 5a provided with teeth that mesh with a toothed belt, a shaft portion 5b that forms a circle having substantially the same diameter as the tooth tip of the gear portion 5a, and extends outward in the axial direction. Is composed of the hexagonal portion 5c at the outermost end in the axial direction and can be fitted to the fixture 1 by screwing the fastening bolt 6 inserted through the center hole 5d onto the back wall.
[0014]
On the other hand, in order to prevent the toothed pulley 5 from tilting when the addendum belt 60 is stretched, the contact piece 8 that contacts the shaft portion 5b having the circular cross section is horizontally extended outward from the other end of the fixture 1. The other end 60b of the toothed belt after being wound around the toothed pulley 5 and protruding from the back wall of the fixture 1 so as to be horizontally positioned at the inner center of the U-shaped guide portion 3 opened at The fixing bolt 9 that is pressed and fixed toward the horizontal portion of the contact piece 8 is screwed vertically to the end portion of the U-shaped guide portion 3.
The bolts 4 and 4 for fixing the fixing device 1 to the bracket 55 are screwed into the bracket 55 through the elongated holes 10 and 10 in the vertical direction of the fixing device 1 in order to allow height adjustment. On the back surface of the door, the door stopper 53 is fixed to the lower edge of the front end of the rail 52 with a slight gap below the door wheel 53 to prevent the door wheel 53 from falling off the rail 52. In addition, the door 57 is fixed to the lower end horizontal portion of the bracket 55 with the bolt 12.
[0015]
The belt tension adjusting device having the above configuration is used as follows.
A pair of toothed pulleys 58a and 58b (see FIG. 5) are stretched on the fixing portion 2 of the fixture 1 that supports the door wheel 53 that runs on the rail 52 and is fixed to the upper portion of the bracket 55 that suspends the door 57. One end 60a of the suspended toothed belt 60 is fitted and meshed, and a bolt 7 with a washer is screwed to prevent it from coming off. Next, the tightening bolt 6 is loosened and a wrench (not shown) is fitted to the hexagonal portion 5c of the toothed pulley 5 and turned. Then, the toothed pulley 5 tries to incline due to the tension applied to the toothed belt 60 as the wrench is turned. However, the inclination is prevented by the shaft portion 5b coming into contact with the contact piece 8. 60 can be easily stretched to an appropriate tension. Finally, the fastening bolt 6 is tightened to securely fix the toothed pulley 5 to the fixture 1, and the fixing bolt 9 is fastened to fix the other end 60b of the toothed belt. As a result, the toothed belt 60 stretched around the pair of toothed pulleys 58a and 58b is adjusted to an appropriate tension, and both ends 60a and 60b are fixed to the bracket 55 via the fixture 1.
In order to reduce the tension of the toothed belt 60, the tightening bolt 6 and the fixing bolt 9 are loosened, the wrench fitted to the hexagonal portion 5c of the toothed pulley 5 is turned in the reverse direction, and then both bolts 6, 9 can be tightened again.
[0016]
As described above, the belt tension adjusting device only fixes the fixing device 1 including the fixing portion 2 and the U-shaped guide portion 3 having the toothed pulley 5 with the tightening bolt 6 pivotally attached to the bracket 55. Compared to the conventional example such as adjusting the length of the cutting bolt 70 with the double nuts 71 and 72 of FIG. Also, the tooth surfaces of the belt ends 60a and 60b are aligned, and the tension can be easily adjusted.
In addition, the toothed pulley 5 is provided with a hexagonal portion 5c, and the contact piece 8 is provided to prevent the inclination of the toothed pulley 5 due to the tension of the toothed belt 60 by contact with the shaft portion 5b. The tension of the toothed belt 60 can be easily adjusted by the toothed pulley 5 and the fastening tool is screwed to the back wall of the fixing tool 1 through the center of the toothed pulley 5. There is an advantage that fixing to the fixture 1 can be performed quickly and reliably.
Further, since the bolt 7 with a washer that prevents the one end 60a of the toothed belt 60 from coming off and the fixing bolt 9 that fixes the other end 60b are provided, the belt ends 60a and 60b are aligned with their tooth surfaces well, and the bracket 55 There is an advantage that it can be fixed securely.
[0017]
2 (A) and 2 (B) show the present invention.Reference exampleIt is the front view and top view which show an example of a belt tension adjustment apparatus. In this adjusting device, the U-shaped guide portion 3 of the fixture 1 described in FIG. 1 is used as a second recess 13 for guiding the other end 60b of the toothed belt, and the second recess 13 is engaged with the other end 60b. 1 is different from FIG. 1 only in that the second sliding block 14 having teeth to be moved is slidably disposed and the feed bolt 15 is screwed to the fixture 1 so that the second sliding block 14 is advanced and retracted. The same members as those in FIG.
The second recess 13 has a stepped horizontal slot that covers the entire front side and opens the other end at the belt height below the feed bolt 15 and fits the protruding rear part of the second sliding block 14. The other end 60b of the toothed belt can be fitted from the front side, and the second sliding block 14 meshing with the other end 60b can be prevented from coming off by the washer bolt 16 screwed to the wall of the stepped portion. ing. The feed bolt 15 is screwed with a lock nut 17 that contacts the other end of the fixture 1 and positions the second sliding block 14 in the slot.
[0018]
The belt tension adjusting device of FIG. 2 is used as follows.
One end 60a of a toothed belt 60 stretched between a pair of toothed pulleys 58a and 58b (see FIG. 5) is fitted into the fixing portion 2 of the fixing tool 1 fixed to the upper part of the bracket 55, and is engaged with each other. Attached bolt 7 is screwed to prevent it from coming off. Next, after engaging the other end 60b of the toothed belt 60 with the second sliding block 14 in the second recess 13 of the fixture 1, the feed bolt 15 with the lock nut 17 loosened is toothed. After the belt 60 is screwed until the proper tension is obtained, the lock nut 17 is tightened to the other end of the fixture 1. As a result, the stretched toothed belt 60 is adjusted to an appropriate tension, and both ends 60 a and 60 b are fixed to the bracket 55.
[0019]
As described above, the belt tension adjusting device of FIG. 2 has a simple structure in which the fixture 1 including the fixing portion 2, the second sliding block 14, and the second recess 13 having the feed bolt 15 is fixed to the bracket 55. Therefore, it takes less space and can be manufactured at a low cost with a small number of parts. Compared to the conventional example in which the length of the dimensioning bolt 70 in FIG. 6 is adjusted, the tooth surfaces of the belt ends 60a and 60b are aligned. The tension can be easily adjusted.
Further, since the washer-attached bolt 16 is screwed to the wall of the stepped portion of the second recess 13, the second sliding block 14 can be prevented from coming off, and the lock nut 17 is screwed to the feed bolt 15. Therefore, there exists an advantage that the 2nd sliding block 14 can be positioned reliably in a slot.
[0020]
3 (A) and 3 (B) show the claims of the present invention.2It is the front view and top view which show an example of the belt tension adjustment apparatus of this. In this adjusting device, the fixing portion 2 of the fixing device 1 in FIG. 1 is a first recess 18 that guides one end 60a of the toothed belt 60, and the first recess 18 has teeth that mesh with the one end 60a. A sliding block 19 is slidably disposed, and a spring 20 as an elastic member is mounted between the first sliding block 19 and one end of the first recess 18 so that the first sliding block 19 is 1 is different from FIG. 1 only in that it is fixed to the fixture 1 with bolts 21 and 21 as fixing members so as to be located at a predetermined position in the first recess 18, and the same members as those in FIG. Description is omitted.
[0021]
The first recess 18 has a groove that has a front side that extends over the entire surface and one end that is open by the belt height, while the first sliding block 19 is for the teeth and bolts 21 that mesh with one end 60a of the belt. The block portion 19a has two insertion holes, and the lid portion 19b extends from the front side of the block portion 19a to the one end side so as to slidably cover the groove hole and prevent the spring 20 from falling off.
Then, when the first sliding block 19 is fitted into the groove hole from the front side so that the one end 60a of the belt is engaged with the block portion 19a and the one end is in contact with the free length spring 20, the above-mentioned right side in FIG. The insertion hole is aligned with the female screw hole 22c at the right end of the three female screw holes 22a, 22b, 22c provided in the back wall of the first recess 18. On the lower edge of the slot, a scale 23 is engraved at the tip of the lid portion 19b when the first sliding block 19 is fitted into the slot in contact with the free length spring 20, and a toothed pulley 5 when the belt 5 is rotated in the belt tension direction and the first sliding block 19 is slid to one end until the two insertion holes are aligned with the left two female screw holes 22a and 22b against the spring 20 A scale 24 is also carved at the tip of the portion 19b. A predetermined optimum tension is applied to the toothed belt 60 by the spring 20 compressed to this state.
[0022]
The belt tension adjusting device of FIG. 3 is used as follows.
The end 60a of the toothed belt 60 stretched is inserted into the slot of the first recess 18 of the fixture 1 fixed to the upper part of the bracket 55, and one end is in contact with one end of the first recess 18 While engaging the block portion 19b with the teeth of the belt end 60a while aligning the tip of the lid portion 19b with the scale 23 so that the block portion 19a of the first sliding block 19 contacts the other end of the long spring 20, One sliding block 19 is fitted into the slot. Next, as described in FIG. 1, the tightening bolt 6 is loosened and a spanner is fitted to the hexagonal portion 5 c of the toothed pulley 5 to prevent the toothed pulley 5 from being tilted by the contact piece 8. The toothed pulley 5 is rotated by turning the spanner until the belt 60 has an appropriate tension. As the toothed pulley 5 rotates, the toothed belt 60 is gradually stretched, and the first sliding block 19 moves toward one end of the slot while compressing and shrinking the spring 20. A tension corresponding to the product of the shortened length and the spring constant is applied. When the first sliding block 19 slides until the end of the lid portion 19b is aligned with the scale 24, a predetermined optimum tension is applied to the toothed belt 60. At this time, the spanner is removed and the toothed pulley 5 is removed. Is fixed to the fixture 1 by tightening the tightening bolt 6. In addition, two bolts 21 are screwed into the female screw holes 22a and 22b aligned in a row to fix the first sliding block 19 to the fixture 1, and the fixing bolt 9 is tightened to fix the other end of the toothed belt. 60b is fixed. Thus, the stretched toothed belt 60 is adjusted to the optimum tension, and both ends 60 a and 60 b are fixed to the bracket 55.
[0023]
As described above, the belt tension adjusting device shown in FIG. 3 merely pivots the first recess 18 having the first sliding block 19, the spring 20, the bolt 21, and the toothed pulley 5 with the tightening bolt 6. Since the structure is simple, it requires less space and can be manufactured at a low cost with a small number of parts. Compared to the conventional example in which the length of the dimensioning bolt 70 in FIG. 6 is adjusted, the teeth on both ends 60a and 60b of the belt. Surfaces are aligned and tension can be adjusted easily.
Further, since the spring 20 is compressed on one end side of the first sliding block 19, the tension applied to the toothed belt 60 as the toothed pulley 5 rotates can be immediately known by the contraction of the spring 20. Therefore, a desired constant tension can be applied to the toothed belt 60 quickly and easily. Of course, the scale for knowing the spring force is engraved at an arbitrary position along the slot.
In addition, since the first sliding block 19 is provided with the lid portion 19b that covers the sliding groove hole, there is an advantage that the spring 20 and the one end 60a of the toothed belt that are contracted with a small number of members can be prevented from falling off. The advantages of the fixing bolt 9 and the hexagonal portion 5c of the toothed pulley and the contact piece 8 are as described in FIG.
[0024]
The belt tension adjusting device of the present inventionReference example2 is obtained by replacing the fixing portion 2 of the adjusting device described in FIG. 2 with the first recess 18 described in FIG. 3 that guides one end 60 a of the toothed belt 60.
Therefore, this belt tension adjusting device is also used in the same manner as described above, does not take up space, can be manufactured at a low cost with a small number of parts, and the tooth surfaces at both ends of the belt are aligned as compared with the conventional example, so that tension adjustment is possible. The work is easy, and in addition, a desired constant tension can be easily and reliably applied to the toothed belt 60 by the spring 20 that is contracted to one end of the first sliding block 19.
[0025]
4 (A), (B), (C) are the claims of the present invention.3It is the front view, side view, and top view which show an example of the belt tension apparatus of this. This adjusting device adds flange portions 31 and 31 protruding from both ends of the second recess 13 to the fixture 1 described in FIG. 2, and the second sliding block 14 in FIG. The feed bolt 15 shown in FIG. 2 is attached to the mounting holes of the flange portions 31 and 31 as a new second sliding block 32 that protrudes forward to the extent that the lower surface 32a has teeth engaged with the other end 60b of the toothed belt. 2 is different from FIG. 2 only in that a new feed bolt 36 having a lock nut 35 under the neck sandwiching the flange 31 is inserted into the through screw hole 34 of the second sliding block 32. Therefore, the same members as those in FIG.
[0026]
The second recess 13 has a U-shaped cross-section opened on the front side (front surface) (see FIG. 4B), is blocked by a flange 31 protruding at the left end, and the same flange portion 31 except for the lower end at the right end. (See FIGS. 4 (A) and 4 (C)), and a fixing portion 2 for fixing one end 60a of the toothed belt is formed below. On the other hand, as shown in FIG. 4B, the second sliding block 32 has a cross-sectional shape that fits into the U-shaped second recess 13 and is in front of the other end 60b of the meshed toothed belt. A plate-like protrusion 32b is provided on the lower surface 32a to contact the side surface to prevent the belt from coming off and to prevent the belt from co-rotating with the feed bolt 36 to ensure reliable forward / backward sliding.
The washer-attached bolt 7 for preventing the toothed belt from being pulled out from the one end 60a is attached to the fixing portion 2 at the upper edge unlike the lower edge of the belt in the embodiment of FIG.
[0027]
The belt tensioning device of FIG. 4 is used as follows.
One end 60a of a toothed belt 60 stretched around a pair of toothed pulleys 58a and 58b (see FIG. 5) is fitted into the fixing portion 2 of the fixing tool 1 fixed to the upper part of the bracket 55 and meshed with each other. Attached bolt 7 is screwed to prevent it from coming off. Next, with the other end 60b of the toothed belt 60 engaged with the teeth on the lower surface of the second sliding block 32, the toothed belt 60 is pulled in the left direction in the drawing and the toothed belt 60 is moderately tensioned. The moving block 32 is fitted into the second recess 13 between the flanges 31 and 31. Subsequently, the feed bolt 36 is inserted into the mounting hole 33 of the left flange 31, the lock nut 35 is screwed under the neck, and the tip of the second sliding block 32 is turned while turning the bolt in the tightening direction. The screw holes 34 are screwed together. At this time, if the second sliding block 32 that is in contact with the right flange 31 by belt tension is pressed by hand, the tip of the feed bolt 36 advances to the back of the screw hole 34 and finally the second It passes through the mounting hole 33 of the right flange 31 through the sliding block 32. At this point, when the hand is separated from the second sliding block 32 and the feed bolt 36 is further turned in the tightening direction, the second sliding block 32 that is prevented from co-rotation by the plate-like protrusion 32b is moved into the second recess 13. To the left, and the toothed belt 60 is further tensioned. Therefore, when the toothed belt 60 reaches an appropriate tension, the lock nut 35 under the neck is tightened until it comes into close contact with the left flange 31. As a result, the stretched toothed belt 60 is adjusted to an appropriate tension, and both ends 60 a and 60 b are fixed to the bracket 55.
[0028]
As described above, the belt tension adjusting device of FIG. 4 fixes the fixture 1 including the fixing portion 2, the second sliding block 32, the flange portion 31 through which the feed bolt 36 is inserted, and the second recess 13 to the bracket 55. The simple structure does not take up space, it can be manufactured inexpensively with a small number of parts, and the tooth surfaces at both ends of the belt are also less than in the conventional example such as adjusting the length of the dimensioning bolt 70 in FIG. As a result, the tension can be easily adjusted.
The feed bolt 36 inserted through the flange portions 31 and 31 protruding forward from both ends of the second recess 13 and screwed into the through screw hole 34 of the second sliding block 32 protruding forward is a toothed belt. 60 and the bracket 55 (see FIG. 4B), the feed bolt 36 and the lock nut 35 can be easily turned with a wrench or the like, and the tension adjustment work of the toothed belt 60 is further facilitated. Can be done.
Further, since the plate-like protrusion 32b is provided on the lower surface 32a of the second sliding block 32, the plate-like protrusion 32b can be brought into contact with the front side surface of the other end 60b of the toothed belt and can be prevented from coming off. It is possible to prevent the sliding block 32 from co-rotating with the feed bolt 36 and to assure reliable sliding. In addition, since the lock nut 35 is screwed under the neck of the feed bolt 36, the second sliding block 32 can be reliably positioned in the second recess 13.
[0029]
The fastening tool for fixing the toothed pulley 5 of the present invention to the fixing tool 1 is not limited to the fastening bolt 6 described above. For example, the fastening tool can be fitted into the spline groove in the center hole of the toothed pulley and used as the fixing tool. A fixed spline shaft or the like may be used, and the elastic member to be compressed on one end side of the first sliding block 19 is not limited to the spring 20 described above, and may be rubber or elastomer. Further, the fixing member for fixing the first sliding block 19 to the fixing tool 1 is not limited to the bolt 21 described above, but may be a clamp or the like. The polygon at the outermost end of the toothed pulley 5 is the same as that described above. It is not limited to a square.
[0030]
【The invention's effect】
As is apparent from the above description, the belt tension adjusting device according to claim 1 includes a fixing portion that fits and fixes one end of the toothed belt in a groove having teeth meshed with one end of the toothed belt, and the fixing And a U-shaped guide portion that forms a U-shape that guides the outer periphery near the other end of the toothed belt, and a fixture that is fixed to the bracket; and the U-shaped guide portion A toothed pulley that is pivotally attached to the fixture so as to be disposed inside and meshes with the other end of the toothed belt, and is inserted into the center hole of the toothed pulley. A fastener for fixing to the fixture.The toothed pulley has a polygon in which the outermost end of the shaft portion can be fitted with a wrench, and abuts against the shaft portion inside the polygon to prevent the toothed pulley from tilting. A piece is provided on the fixture so as to be positioned inside the U-shaped guide.Therefore, space is not required, the number of parts is small, and it can be manufactured at a low cost. Compared to the conventional example, the tooth surfaces at both ends of the belt are aligned, and the tension can be easily adjusted.
[0031]
In the belt tension adjusting device according to claim 2, the fixing portion of the fixing device of the belt tension adjusting device according to claim 1 is a first recess that guides one end of the toothed belt, and the toothed belt is inserted into the first recess. A first sliding block having teeth engaged with one end is slidably disposed, and an elastic member is mounted between the first sliding block and one end of the first recess, so that the first sliding block is provided. Since the block is fixed to the fixture by a fixing member so as to be positioned at a predetermined position in the first recess, it does not take up space and can be manufactured at a low cost with a small number of parts, compared to the conventional example. The tooth surfaces at both ends of the belt are also aligned, and the tension can be easily adjusted. In addition, a desired constant tension can be easily and reliably applied by the elastic member.
[0032]
Claim3The belt tension adjusting device extends horizontally and engages with one end of the toothed belt.Above the groove formed on the topA fixed part that fits one end of the toothed belt from the front side and prevents it from being fixed with a bolt with a washer, and is connected in parallel to the upper part of the fixed part. Each of the second recesses for guiding the other end of the toothed belt and flanges projecting forward from both ends of the second recesses. A fixing tool to be fixed, a tooth to be engaged with the other end of the toothed belt, and a plate-like protrusion for preventing the toothed belt from coming off are provided on the lower surface, protrude forward, and slide into the second recess. A freely-slidable second sliding block and a nut inserted through the mounting hole of the flange portion, screwed into a screw hole penetrating the second sliding block, and below the neck sandwiching the flange portion A feed bolt for advancing and retracting the second sliding block; Because it has less space, it can be manufactured inexpensively with fewer parts, and the tooth surfaces on both ends of the belt are aligned and tension can be easily adjusted compared to the conventional example. The belt tension adjustment operation can be further facilitated because it is positioned forward and can be easily rotated.
[Brief description of the drawings]
FIG. 1 (A) is a front view showing an example of a belt tension adjusting device according to claim 1 of the present invention, and FIG. 1 (B) is a sectional view taken along line bb of FIG. 1 (A). FIG. 1C is a cross-sectional view taken along the line cc of FIG.
FIG. 2 of the present inventionReference exampleIt is the front view and top view which show an example of a belt tension adjustment apparatus.
3 (A) is a front view showing an example of a belt tension adjusting device according to claim 2 of the present invention, and FIG. 3 (B) is a cross-sectional view taken along line bb of FIG. 3 (A). It is.
FIG. 4 (A) is a belt tensioning apparatus according to claim 3 of the present invention.OneFIG. 4B is a cross-sectional view taken along line bb in FIG. 4A, and FIG. 4C is a plan view of the belt tensioning device.
FIG. 5 is a front view showing an entire suspension door driven by a conventional belt.
6 is an enlarged front view and side view of a V portion in FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fixing tool, 2 ... Fixing part, 3 ... U-shaped guide part, 5 ... Toothed pulley,
5b ... shaft, 5c ... hex, 6 ... clamping bolt, 8 ... contact piece, 13 ... second recess,
14 ... 2nd sliding block, 15 ... Feed bolt, 18 ... 1st recessed part,
19 ... 1st sliding block, 20 ... Spring, 21 ... Bolt,
22a-22c ... female screw hole, 23, 24 ... scale, 51 ... opening,
52 ... Rail, 53 ... Door, 55 ... Bracket, 57 ... Door,
58a, 58b ... toothed pulley, 60 ... toothed belt, 60a ... one end, 60b ... the other end.

Claims

In a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and stretched around one end and the other end fixed to a bracket.
A fixing portion that fits and fixes one end of the toothed belt in a groove having teeth meshed with one end of the toothed belt, and a U that is connected to the fixing portion and guides an outer periphery near the other end of the toothed belt. A fixture having a U-shaped guide portion having a letter shape and fixed to the bracket;
A toothed pulley that is pivotally attached to the fixture so as to be disposed inside the U-shaped guide, and meshes with the other end of the toothed belt;
A fastener that is inserted into the center hole of the toothed pulley and fixes the toothed pulley to the fixture ;
The toothed pulley has a polygon in which the outermost end of the shaft portion can be fitted with a wrench, and a contact piece that contacts the shaft portion inside the polygon to prevent the toothed pulley from tilting. Is provided on the fixture so as to be positioned inside the U-shaped guide .

In a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and stretched around one end and the other end fixed to a bracket.
A first recess that guides one end of the toothed belt, and a U-shaped guide portion that is connected to the first recess and guides the outer periphery in the vicinity of the other end of the toothed belt, A fixture fixed to the bracket;
A toothed pulley that is pivotally attached to the fixture so as to be disposed inside the U-shaped guide, and meshes with the other end of the toothed belt;
A fastening tool that is inserted into the center hole of the toothed pulley and fixes the toothed pulley to the fixing tool;
A first sliding block having teeth to be engaged with one end of the toothed belt, fitting and fixing one end of the toothed belt, and slidably received in the first recess;
An elastic member that is compressed between the first sliding block and one end of the first recess, and the first sliding block is fixed to the fixture so as to be positioned at a predetermined position in the first recess. A fixing member ,
The toothed pulley has a polygon in which the outermost end of the shaft portion can be fitted with a wrench, and a contact piece that contacts the shaft portion inside the polygon to prevent the toothed pulley from tilting. Is provided on the fixture so as to be positioned inside the U-shaped guide .

In a belt tension adjusting device that adjusts the tension of a toothed belt that is wound around a pair of toothed pulleys and stretched around one end and the other end fixed to a bracket.
A fixing portion extending horizontally and engaging one end of the toothed belt from a front side into a groove formed at an upper portion of a tooth that meshes with one end of the toothed belt, and fixing it with a bolt with a washer; A second portion that is parallel to the upper portion of the fixing portion, has a front side that extends over the entire surface, and that the other end forms a slot that is opened by the height of the toothed belt, and guides the other end of the toothed belt. A fixture having a recess and a flange protruding forward from both ends of the second recess, and fixed to the bracket;
A second tooth which has a tooth engaged with the other end of the toothed belt and a plate-like protrusion for preventing the toothed belt from coming off, protrudes forward, and is slidably received in the second recess. A sliding block;
The second sliding block is inserted into the mounting hole of the flange portion, screwed into a screw hole penetrating the second sliding block, and having a lock nut under the neck sandwiching the flange portion. A belt tension adjusting device comprising a feed bolt for advancing and retreating.