JP4186018B2

JP4186018B2 - Workbench

Info

Publication number: JP4186018B2
Application number: JP2000007315A
Authority: JP
Inventors: 直樹垰
Original assignee: 長谷川工業株式会社
Priority date: 2000-01-17
Filing date: 2000-01-17
Publication date: 2008-11-26
Anticipated expiration: 2020-01-17
Also published as: JP2001193276A

Description

【０００１】
【発明の属する技術分野】
この発明は、作業台に関し、特に、脚立に代えて使用することができ、かつ、脚立に比べてその安全性および作業性を向上させた作業台に関する。
【０００２】
【従来の技術】
左右支柱および左右支柱間に渡し止められた複数の踏桟よりなる前後一対の脚と、前後脚の上端部に設けられた天板と、前後脚の上端部同士を互いに回動しうるように連結する連結部材とを備えている脚立は、従来よりよく知られている。
【０００３】
【発明が解決しようとする課題】
この種の脚立では、天板の上に立って作業をしないように作業標準が決められているが、この標準を守らずに作業が行われることもあり、安全性の向上が課題となっている。
【０００４】
この発明の目的は、従来の脚立に比べて安全性が高くかつ作業効率が良い作業台を提供することにある。
【０００５】
【課題を解決するための手段および発明の効果】
この発明による作業台は、左右支柱および左右支柱間に渡し止められた複数の踏桟よりなる前後一対の脚と、前後脚の上端部同士を互いに回動しうるように連結する連結部材と、前後脚の上部の踏桟間に渡し止められた作業床とを備えており、作業床は、前脚の踏桟に前ヒンジ手段を介して回動自在に取り付けられた前足場板と、後脚の踏桟に後ヒンジ手段を介して回動自在に取り付けられた後足場板と、両足場板同士を折り畳み可能に結合する中央ヒンジ手段とよりなり、中央ヒンジ手段は、前足場板の後縁部に設けられた第１ヒンジ構成部と、後足場板の前縁部に設けられた第２ヒンジ構成部と、第１ヒンジ構成部に回動可能に嵌め合わされている第３ヒンジ構成部および第２ヒンジ構成部に回動可能に嵌め合わされている第４ヒンジ構成部を有する連結部材とよりなり、前ヒンジ手段は、前足場板の前縁部に設けられた第５ヒンジ構成部と、前脚の踏桟に設けられかつ第５ヒンジ構成部に回動可能に嵌め合わされている第６ヒンジ構成部とよりなり、後ヒンジ手段は、後足場板の後縁部に設けられた第７ヒンジ構成部と、後脚の踏桟に設けられかつ第７ヒンジ構成部に回動可能に嵌め合わされている第８ヒンジ構成部とよりなることを特徴とするものである。
【０００６】
この発明の作業台によると、作業者は、天板でなく作業床上で作業を行うことになり、その安全が確保される。また、作業終了後は、前後脚同士がほぼ平行となるように脚および作業床を折り畳むことにより、小さなスペースに収納することができる。
【０００７】
前脚の左右支柱の上端部間に、安全バーが渡し止められていることが好ましい。このようにすると、安全バーによって作業者の落下が防止され、また、安全バーを手でつかんでの作業が可能となり、より安全性が向上する。
【０００８】
前後いずれか一方の脚に、折り畳まれた作業台を運搬する際に使用されるキャスタが支持装置を介して取り付けられており、キャスタ支持装置は、前後いずれか一方の脚の左右支柱の下端部に着脱自在に取り付けられた固定ブラケットと、キャスタを支持しかつ支柱の長さ方向とほぼ平行な軸を中心に回動しうるように固定ブラケットに取り付けられた可動ブラケットとを備え、可動ブラケットが、前後方向外側に張り出したキャスタ使用位置と張り出さないキャスタ収納位置とに回動可能とされており、可動ブラケットに、キャスタ収納位置にあるときに固定ブラケットが取り付けられていない方の脚の左右支柱の下端部に係合する開き止め用係合部が設けられていることがある。このようにすると、作業台使用前後にキャスタを使って容易に運搬することができ、保管時には、キャスタを支持している可動ブラケットを回動させて、キャスタを邪魔にならないように収納することができ、同時に、その開き止め用係合部を固定ブラケットが取り付けられていない方の脚の左右支柱の下端部に係合させることにより、別途の開き止めを設けることなく、前後脚同士の開き止めが果たされる。
【０００９】
そして、固定ブラケットと可動ブラケットとは、弾性部材によって上下いずれか一方に付勢された連結ピンで結合されており、連結ピンは、付勢方向に移動することによって可動ブラケットの回動を阻止するロック位置と、付勢方向と逆向きに押されることによりその回動を許容するアンロック位置とに移動可能とされていることが好ましい。このようにすると、連結ピンを押すだけの操作により、キャスタを収納状態と使用状態とに容易に切り換えることができる。
【００１０】
各ヒンジ手段は、丁番であってもよいが、前後足場板に連結部材を介在させるとともに、踏桟、前後足場板および連結部材を押出型材製とし、各ヒンジ構成部をこれらに一体に形成することが好ましい。例えば、中央ヒンジ手段は、前足場板の後縁部に設けられた第１ヒンジ構成部と、後足場板の前縁部に設けられた第２ヒンジ構成部と、第１ヒンジ構成部に回動可能に嵌め合わされている第３ヒンジ構成部および第２ヒンジ構成部に回動可能に嵌め合わされている第４ヒンジ構成部を有する連結部材とよりなり、前足場板の後縁部に設けられた第１ヒンジ構成部と、後足場板の前縁部に設けられた第２ヒンジ構成部と、連結部材の前部に設けられかつ第１ヒンジ構成部に回動可能に嵌め合わされている第３ヒンジ構成部と、連結部材の後部に設けられかつ第２ヒンジ構成部に回動可能に嵌め合わされている第４ヒンジ構成部とよりなり、前ヒンジ手段は、前足場板の前縁部に設けられた第５ヒンジ構成部と、前脚の踏桟に設けられかつ第５ヒンジ構成部に回動可能に嵌め合わされている第６ヒンジ構成部とよりなり、後ヒンジ手段は、後足場板の後縁部に設けられた第７ヒンジ構成部と、後脚の踏桟に設けられかつ第７ヒンジ構成部に回動可能に嵌め合わされている第８ヒンジ構成部とよりなり、前後足場板の左右端面に、前後足場板に対する連結部材の左右移動を規制するサイドカバーが取り付けられ、前足場板の前端部と前脚の左右支柱との間および後足場板の後端部と後脚の左右支柱との間に、左右支柱に対する前後足場板の左右移動を規制する足場板がたつき防止部が介在させられている構成とされる。このようにすると、前後足場板に対して連結部材をスライドさせるだけで、前後足場板同士を連結部材を介して結合することできるので、組立工数が減少でき、サイドカバーによって連結部材の抜け止めが果たされ、足場板がたつき防止部によって前後足場板の左右移動が規制されて足場板のがたつきが防止される。
【００１１】
前後足場板がたつき防止部がサイドカバーに一体に設けられるとともに、前側の足場板がたつき防止部に、第６ヒンジ構成部に回動可能に嵌め合わせられているヒンジ構成部が設けられ、後側の足場板がたつき防止部に、第８ヒンジ構成部に回動可能に嵌め合わせられているヒンジ構成部が設けられていることがある。このようにすると、サイドカバーは、連結部材の抜け止め作用だけでなく、足場板がたつき防止および足場板位置決め作用も兼ねることができ、部品数を少なくすることができる。
【００１２】
また、第５ヒンジ構成部および第７ヒンジ構成部は、半円より大きい横断面円弧状の内周面を有するフック状とされ、第６ヒンジ構成部および第８ヒンジ構成部は、略円筒状で周壁の対向する部分が狭められた踏桟により形成されていることがある。この場合に、第６ヒンジ構成部および第８ヒンジ構成部の円弧面は、上および下に位置させられ、第５ヒンジ構成部および第７ヒンジ構成部は、これらに上から嵌め合わされる。したがって、第５ヒンジ構成部および第７ヒンジ構成部が、通常の使用状態から第６ヒンジ構成部および第８ヒンジ構成部に対して所定角度回動させられた際に、取り外し可能（したがって、取り付け可能）とされていることがある。このようにすると、ヒンジ手段の構成が簡単となり、部品形状を簡素化することができる。この場合に、足場板がたつき防止部は、円筒状とされて、踏桟に嵌め被せられ、第５および第７ヒンジ構成部と左右支柱との間に介在される。
【００１３】
【発明の実施の形態】
この発明の実施の形態を、以下図面を参照して説明する。この明細書において、前後および左右は、台上で作業を行う者から見ていうものとする。
【００１４】
この発明による作業台は、図１から図３までに示すように、左右支柱(3)(4)および支柱(3)(4)間に渡し止められた複数（４段）の踏桟(5)(5A)(6)(6A)よりなる前後一対の脚(1)(2)と、左右支柱(3)(4)の上端部に固定され前後脚(1)(2)の上端部同士を互いに回動しうるように連結する連結部材(7)(8)と、各支柱(3)(4)の下端部に下から被せられた支柱端具(9)(10)と、前後脚(1)(2)の上部（この実施形態では最上段）の踏桟(5A)(6A)間に渡し止められた方形の作業床(11)と、前脚(1)の左右支柱(3)の上端部間に渡し止められた安全バー(12)と、後脚(2)の左右支柱(4)の下端部にキャスタ支持装置(14)を介して取り付けられた運搬用キャスタ(13)とを備えている。
【００１５】
この作業台は、図２に示すように、作業床(11)の上に立って作業を行うものであり、使用後は、図３に示すように、作業床(11)を折り畳み、キャスタ(13)を使用して簡単に持ち運びできるようになされている。
【００１６】
各支柱(3)(4)および踏桟(5)(5A)(6)(6A)は、いずれもアルミニウム押出形材製で、各支柱(3)(4)は、横断面コ字形に形成されており、各踏桟(5)(5A)(6)(6A)は、横断面略台形の中空状に形成されている。
【００１７】
作業床(11)は、図４から図６までに示すように、左右に長い長方形のアルミニウム押出形材製前後足場板(21)(22)と、前後足場板(21)(22)の間に介在されているアルミニウム押出形材製連結部材(28)と、前後足場板(21)(22)の左右端面に被せられた合成樹脂製の前後サイドカバー(26)とを備えている。後述するように、前足場板(21)が、前脚(1)の最上段の踏桟(5A)に前ヒンジ手段(23)を介して回動自在に取り付けられ、後足場板(22)が、後脚(2)の最上段の踏桟(6A)に後ヒンジ手段(24)を介して回動自在に取り付けられており、両足場板(21)(22)同士が、中央ヒンジ手段(25)によって逆Ｖ字状に折り畳み可能に結合されている。
【００１８】
前後足場板(21)(22)は、前後壁(21a)(21b)(22a)(22b)および上下壁(21c)(21d)(22c)(22d)を有する断面略方形の中空状に形成されており、前壁(21a)(22a)と後壁(21b)(22b)との間に、２つの補強壁(21e)(22e)が設けられている。
【００１９】
各ヒンジ手段(23)(24)(25)は、最上段の踏桟(5A)(6A)、前後足場板(21)(22)および連結部材(28)に、ヒンジ構成部(31)(32)(33)(34)(35)(36)(37)(38)を一体形成することにより得られている。すなわち、中央ヒンジ手段(25)は、前足場板(21)の後縁部に形成された第１ヒンジ構成部(31)と、後足場板(22)の前縁部に形成された第２ヒンジ構成部(32)と、連結部材(28)の前部に形成された第３ヒンジ構成部(33)と、連結部材(28)の後部に形成された第４ヒンジ構成部(34)とよりなり、前ヒンジ手段(23)は、前足場板(21)の前縁部に形成された第５ヒンジ構成部(35)と、前脚(1)の最上段の踏桟(5A)に形成された第６ヒンジ構成部(36)とよりなり、後ヒンジ手段(24)は、後足場板(22)の後縁部に形成された第７ヒンジ構成部(37)と、後脚(2)の最上段の踏桟(6A)に形成された第８ヒンジ構成部(38)とよりなる。
【００２０】
図５および図６に詳しく示すように、前足場板(21)の後縁部下面には、後方に開口した凹溝(41)が設けられており、後足場板(22)の前縁部下面には、前方に開口した凹溝(51)が設けられている。前足場板(21)の凹溝(41)は、凹円弧状の曲線状壁部(42)と、これの下縁から後方にのびる直線状壁部(43)とによって形成されている。曲線状壁部(42)の外周には、カバー(26)を取り付けるタッピンねじ(27)（図４参照）をねじ込むための断面Ｃ状の溝(44)が形成されている。同様に、後足場板(22)の凹溝(51)は、凹円弧状の曲線状壁部(52)と、これの下縁から前方にのびる直線状壁部(53)とによって形成されており、曲線状壁部(52)の外周には、サイドカバー(26)を取り付けるタッピンねじ(27)をねじ込むための断面Ｃ状の溝(54)が形成されている。連結部材(28)は、図７に拡大して示すように、水平な上壁(28a)と、横断面鉤形の前後壁(28b)(28c)とよりなり、図５に示す作業台使用状態において、その前部が、前足場板(21)の凹溝(41)に、その後部が、後足場板(22)の凹溝(51)に、相対的に回動可能なように嵌め入れられている。各凹溝(41)(51)の直線状壁部(43)(53)の後縁には、上方にのびかつ連結部材(28)の前後壁(28b)(28c)の下縁部に係合する係合部(45)(55)が設けられている。
【００２１】
また、前脚(1)の最上段の踏桟(5A)の上面には、後方に開口した凹溝(61)が設けられており、後脚(2)の最上段の踏桟(6A)の上面には、前方に開口した凹溝(71)が設けられている。各凹溝(61)(71)は、いずれも円弧状の２つの曲線状壁部(62)(63)(72)(73)によって形成されている。そして、前足場板(21)の前縁部上面には、前脚(1)の最上段の踏桟(5A)の凹溝(61)に相対的に回動可能に嵌め合わされる凸部(64)が前方突出状に設けられ、後足場板(22)の後縁部上面には、後脚(2)の最上段の踏桟(6A)の凹溝(71)に相対的に回動可能に嵌め合わされる凸部(74)が後方突出状に設けられている。各凸部(64)(74)は、短い直線状壁部(65)(75)および長い円弧状壁部(66)(76)からなる。図５に示す作業台使用状態において、円弧状壁部(66)(76)の先端面が凹溝(61)(71)の奥の面に当たるようになされている。
【００２２】
図７に示すように、連結部材(28)の前壁(28b)は、前方下向きに曲がった横断面円弧状の屈曲部(46)と、屈曲部(46)の前縁に連なる後向き折返し状係合部(47)とよりなり、同後壁(28c)は、後方下向きに曲がった横断面円弧状の屈曲部(48)と、屈曲部(48)の後縁に連なる前向き折返し状係合部(49)とよりなる。第３ヒンジ構成部(33)は、折返し状係合部(47)後縁に設けられかつ点Ａを中心とする円の後半部の円周面を有する小径円弧状面(47a)と、屈曲部(46)外周に設けられかつ小径円弧状面(47a)と同心の４分の１円の円周面を有する大径円弧状面(46a)とを有している。また、第１ヒンジ構成部(31)は、凹溝(41)の曲線状壁部(42)の内周に設けられかつ第３ヒンジ構成部(33)の大径円弧状面(46a)に曲率半径がほぼ等しい４分の１円の円周面を有する大径円弧状面(42a)と、同直線状壁部(43)の後縁上面から係合部(45)の基部にかけて設けられかつ第３ヒンジ構成部(33)の小径円弧状面(47a)に曲率半径がほぼ等しい４分の１円の円周面を有する小径円弧状面(43a)とを有している。
【００２３】
第２ヒンジ構成部(32)および第４ヒンジ構成部(34)は、第１ヒンジ構成部(31)および第２ヒンジ構成部(32)と対称となるように形成されている。すなわち、第４ヒンジ構成部(34)は、折返し状係合部(49)後縁に設けられかつ点Ｂを中心とする円の後半部の円周面を有する小径円弧状面(49a)と、屈曲部(48)外周に設けられかつ小径円弧状面(49a)と同心の４分の１円の円周面を有する大径円弧状面(48a)とを有している。また、第２ヒンジ構成部(32)は、凹溝(51)の曲線状壁部(52)の内周に設けられかつ第4ヒンジ構成部(34)の大径円弧状面(48a)に曲率半径がほぼ等しい４分の１円の円周面を有する大径円弧状面(52a)と、同直線状壁部(53)の後縁上面から係合部(55)の基部にかけて設けられかつ第４ヒンジ構成部(34)の小径円弧状面(49a)に曲率半径がほぼ等しい４分の１円の円周面を有する小径円弧状面(53a)とを有している。
【００２４】
図８に示すように、前足場板(21)の凸部(64)の短い直線状壁部(65)の前縁には、点Ｃを中心とする円の前半部および後半部の下半部の円周面を有する膨らみ部(67)が形成されており、第５ヒンジ構成部(35)は、この膨らみ部(67)の外周面(67a)と、長い円弧状壁部(66)の内周および外周に設けられかつ膨らみ部(67)の外周面(67a)と同心の４分の１より大きい円の円周面を有する円弧状内周面(66a)および円弧状外周面(66b)とからなる。そして、第６ヒンジ構成部(36)は、前脚(1)の最上段の踏桟(5A)の凹溝(61)を形成する上側の曲線状壁部(62)の上面に設けられかつ膨らみ部(67)の外周面(67a)に曲率半径がほぼ等しい半円の円周面を有する小径凹円弧状面(62a)と、曲線状壁部(62)の下面に設けられかつ第５ヒンジ構成部(35)の円弧状内周面(66a)に曲率半径がほぼ等しい半円の円周面を有する凸円弧状面(62b)と、前脚(1)の最上段の踏桟(5A)の凹溝(61)を形成する下側の曲線状壁部(63)に設けられかつ第５ヒンジ構成部(35)の円弧状外周面(66b)に曲率半径がほぼ等しい４分の１円の円周面を有する大径凹円弧状面(63a)とからなる。
【００２５】
第７ヒンジ構成部(37)および第８ヒンジ構成部(38)は、第５ヒンジ構成部(35)および第６ヒンジ構成部(36)と対称となるように形成されている。
【００２６】
図５に示す作業台を開いた使用状態において、前足場板(21)の後壁(21b)と後足場板(22)の前壁(22a)とが突き合わされるとともに、前脚(1)の最上段の踏桟(5A)の凹溝(61)に前足場板(21)の凸部(64)の円弧状壁部(66)が嵌め入れられ、後脚(2)の最上段の踏桟(6A)の凹溝(71)に後足場板(22)の凸部(74)の円弧状壁部(76)が嵌め入れられることにより、前足場板(21)および後足場板(22)が連結部材(28)に対して上方へ回動することが阻止されるとともに、前後の脚(1)(2)が前足場板(21)および後足場板(22)に対して回動することも阻止されている。そして、この状態から、両足場板(21)(22)が逆Ｖ字状となるように力を加えると、図７および図８に示すように、前足場板(21)の後壁(21b)と後足場板(22)の前壁(22a)とが互いに開いていくとともに、最上段の踏桟(5A)(6A)の凹溝(61)(71)から前後足場板(21)(22)の凸部(64)(74)が抜け出し、最終的に、前足場板(21)が約９０°下方に回動し、後足場板(22)も約９０°下方に回動し、同時に、前後脚(1)(2)が前後足場板(21)(22)に対してそれぞれ約７５°回動することにより、図６に示す折り畳み状態が得られる。
【００２７】
図４において、前後足場板(22)の左右幅は、左右支柱(3)(4)間の内法よりも狭くなされており、後足場板(22)の左端面に被せられるサイドカバー(26)には、後足場板(21)の前後壁(22a)(22b)または補強壁(22e)に当てられる３つのカバーずれ防止部(26a)と、後足場板(22)の後端部と後脚(2)の左右支柱(4)との間に嵌め入れられて左右支柱(4)に対する後足場板(22)の左右移動を規制している足場板がたつき防止部(26b)とが設けられている。足場板がたつき防止部(26b)は、その横断面形状が後足場板(22)の凸部(74)の横断面形状と同じになるように形成されているもので、これにより、図示したサイドカバー(26)の足場板がたつき防止部(26b)には、第８ヒンジ構成部(38)に回動可能に嵌め合わせられるヒンジ構成部が形成されている。前足場板(21)の右端面に被せられるサイドカバー(26)は、図示したものと同じ形状のもので、前足場板(21)の左端面および後足場板(22)の右端面に被せられるサイドカバー(26)は、図に示したものと対称に形成される。こうして、前側の足場板がたつき防止部(26b)には、第６ヒンジ構成部(36)に回動可能に嵌め合わせられているヒンジ構成部が形成されている。また、前側のサイドカバー(26)は、連結部材(28)の前部を含む前足場板(21)の端面全面を覆い、後側のサイドカバー(26)は、連結部材(28)の後部を含む後足場板(22)の端面全面を覆うようになされており、これによって、連結部材(28)の前後足場板(21)(22)に対する左右移動が阻止されている。
【００２８】
なお、前後足場板(21)(22)は、踏桟(5A)(6A)に対して所定角度（約１１０°程度）以上回動させることにより、踏桟(5A)(6A)から外すことができる。したがって、図９に示すように、所定角度以上回動させた状態で、足場板(22)を支柱(4)に沿って上方から接近させて踏桟(5A)(6A)に当て、折畳み方向とは逆方向にこれを回動させることにより、足場板(22)の凸部(74)の曲線状壁部(76)を踏桟(5A)(6A)の凹溝(71)に嵌め入れることができる。また、連結部材(28)は、前後足場板(21)(22)に対してスライド可能であり、前足場板(21)付きの前脚(1)と後足場板(22)付きの後脚(2)とを対向させて、連結部材(28)をスライドさせて両足場板(21)(22)の凹溝(41)(51)に嵌め入れることにより、連結部材(28)によって足場板(21)(22)付き脚(1)(2)同士が連結される。この後、サイドカバー(26)を被せることにより、作業台を容易に組み立てることができる。
【００２９】
この作業台によると、図２に示すように、作業者は、広い作業床(11)上で安定した作業を行うことができ、また、必要に応じて、安全バー(12)を手でつかむことによって、より安全な作業を行うことができる。そして、使用後には、作業床(11)を逆Ｖ字状に折り畳むとともに、前後脚(1)(2)同士をこれらがほぼ平行となるように重ねることにより、コンパクトに収納することができる。
【００３０】
図１０から図１３までに示すように、キャスタ支持装置(14)は、後脚(2)の左右支柱(4)の下端部に取り付けられた固定ブラケット(81)と、キャスタ(13)を支持しかつ固定ブラケット(81)に支持された可動ブラケット(82)と、両ブラケット(81)(82)を結合する連結ピン(83)と、連結ピン(83)に嵌められた圧縮コイルばね(84)と、固定ブラケット(81)を支柱(4)に取り付ける蝶ボルト(85)とを備えている。
【００３１】
固定ブラケット(81)は、内壁(91a)、外壁(91b)および後壁(91c)からなるコ字形の取付部(91)と、取付部(91)の外壁(91b)の上下縁の中央部から外方に張り出した上下一対の対向壁(92a)(92b)からなる連結部(92)とからなる。取付部(91)の外壁(91b)の前端部には、ボルト挿通孔(93)があけられ、同内壁(91a)の前端部には、貫通めねじ部(94)が設けられている。固定ブラケット(81)は、その取付部(91)が支柱(4)に後方から嵌め合わされ、その内外壁(91a)(91b)が支柱(4)を挟んだ状態で、外壁(91b)のボルト挿通孔(93)に外側から通された蝶ボルト(85)が、内壁(91a)のめねじ部(94)にねじ込まれることにより、支柱(4)に着脱自在に取り付けられている。
【００３２】
可動ブラケット(82)は、内壁(95a)、外壁(95b)および前壁(95c)からなるコ字形のキャスタ取付部(95)と、キャスタ取付部(95)の前壁(95c)から前方に張り出した上下一対の対向壁(96a)(96b)からなる連結部(96)と、キャスタ取付部(95)の内壁(95a)から内方に突出した前後一対の対向壁(97a)(97b)からなる開き止め用係合部(97)とからなる。
【００３３】
連結ピン(83)は、軸部(98)と、軸部(98)の下端に設けられた頭部(99)とよりなる。軸部(98)の中間部分に、環状溝(98a)が設けられ、頭部(99)に、上方に突出した前後一対の突起(99a)(99b)が設けられている。
【００３４】
固定ブラケット(81)の連結部(92)の対向壁(92a)(92b)および可動ブラケット(82)の連結部(96)の対向壁(96a)(96b)には、それぞれ連結ピン挿通孔(100)(101)が設けられており、固定ブラケット(81)と可動ブラケット(82)とは、それぞれの連結部(92)(96)同士が重ね合わされて、それらの対向壁(92a)(92b)(96a)(96b)のピン挿通孔(100)(101)に連結ピン(83)が下から挿通されることにより結合されている。これにより、可動ブラケット(82)は、固定ブラケット(81)に対して、連結ピン(83)の軸を中心として回動可能とされている。固定ブラケット(81)の連結部(92)の各対向壁(92a)(92b)の前後幅は、可動ブラケット(82)の連結部(96)の各対向壁(96a)(96b)の前後幅よりも狭くなされ、両連結部(92)(96)同士が、可動ブラケット(82)の対向壁(96a)(96b)が固定ブラケット(81)の対向壁(92a)(92b)を挟むようにかつそれらの対向壁(92a)(92b)(96a)(96b)の前縁同士を一致させるようにして、互いに重ね合わせられている。各対向壁(92a)(92b)(96a)(96b)の前縁部には、方形の切欠き(102)(103)が同位置に設けられており、さらに、固定ブラケット(81)の対向壁(92a)(92b)の後縁部には、方形の切欠き(104)が設けられ、可動ブラケット(82)の対向壁(96a)(96b)の後縁部近くには、方形の貫通孔(105)が設けられている。
【００３５】
連結ピン(83)の頭部(99)の前後突起(99a)(99b)は、通常（作業台の使用時および運搬時）、前の突起(99a)が各対向壁(92a)(92b)(96a)(96b)の前の切欠き(103)(102)に、後の突起(99b)が可動ブラケット(82)の下側の対向壁(96b)の方形貫通孔(105)に嵌まり合っている。この状態で、軸部(98)の環状溝(98)は、固定ブラケット(81)の上側の対向壁(92a)よりも下に位置させられており、軸部(98)に環状のばね受け板(86)が嵌められ、その上方への移動が、環状溝(98a)に嵌められた止め輪(87)で阻止されている。
【００３６】
圧縮コイルばね(84)は、連結ピン(83)のばね受け板(86)と固定ブラケット(81)の下側の対向壁(92b)上面とによって受け止められており、連結ピン(83)を上向きに付勢している。圧縮コイルばね(84)に付勢された連結ピン(83)は、その頭部(99)の上面が可動ブラケット(82)の連結部(96)の下側の対向壁(96b)下面に当接することにより、上方への移動が阻止されている。この状態では、上述のように、連結ピン(83)の頭部(99)の前の突起(99a)が両ブラケット(81)(82)の下側対向壁(92b)(96b)の切欠き(102)(103)の両方に嵌まり合うことによって、可動ブラケット(82)の固定ブラケット(81)に対する回動が阻止されている。なお、連結ピン(83)の軸から前の突起(99a)までの距離は、後の突起(99b)までの距離よりも小さくなされており、さらに、前の突起(99a)の高さは、後の突起(99b)の高さよりも小さくなされ、後の突起(99b)の高さは、連結ピン(83)の軸部(98)の先端が可動ブラケット(82)の上側の対向壁(96a)から突出している量よりも大きくなされている。したがって、連結ピン(83)の先端を下方に押すことにより、前の突起(99a)を固定ブラケット(81)の下側の対向壁(92b)の切欠き(102)と係合しない位置、すなわちアンロック位置に移動させることができる。後の突起(99b)は、可動ブラケット(82)の回動を妨げるものではないから、連結ピン(83)がアンロック位置にあるときには、可動ブラケット(82)は、連結ピン(83)の軸を中心として、回動可能となり、図１０および図１３に矢印で示すように、約１８０°回動することができる。このとき、図１２および図１３に鎖線で示すように、可動ブラケット(82)の開き止め用係合部(97)が前脚(1)の断面コ字形の支柱(3)の開口に嵌まり合う。これにより、前後脚(1)(2)同士が互いに離れる方向への移動が阻止される。ここで、連結ピン(83)は、その後の突起(99b)が可動ブラケット(82)の連結部(96)の下側の対向壁(96b)の貫通孔(105)に嵌まり合ったままで、可動ブラケット(82)とともに回動し、可動ブラケット(82)が１８０°回動した時点で、前の突起(99a)が固定ブラケット(81)の下側の対向壁(92b)の後の切欠き(104)に嵌まり合い、これにより、可動ブラケット(82)の固定ブラケット(81)に対する回動が阻止される。こうして、キャスタ(13)を使用位置から収納位置に移動させることができるとともに、キャスタ(13)が収納されることにより、別途の開き止めを設けることなく、前後脚(1)(2)の開き止めが果たされる。
【００３７】
図１４から図１７までには、この作業台の第２実施形態を示す。この作業台の作業床(111)は、図１４から図１６までに示すように、前脚(1)の最上段の踏桟(105A)に前ヒンジ手段(123)を介して回動自在に取り付けられた前足場板(121)と、後脚(2)の最上段の踏桟(106A)に後ヒンジ手段(124)を介して回動自在に取り付けられた後足場板(122)と、両足場板(121)(122)同士を逆Ｖ字状に折り畳み可能に結合する中央ヒンジ手段(25)と、前後足場板(121)(122)の左右端面に被せられた合成樹脂製の前後サイドカバー(126)と、最上段の踏桟の左右端部に嵌め被せられた合成樹脂製の足場板がたつき防止部(128)とよりなる。両足場板(121)(122)の間には、アルミニウム押出形材製連結部材(28)が介在されている。
【００３８】
前後足場板(121)(122)は、アルミニウム押出形材製で、前後壁(121a)(121b)(122a)(122b)および上下壁(121c)(121d)(122c)(122d)を有する断面略方形の中空状に形成されており、前壁(121a)(122a)と後壁(121b)(122b)との間に、２つの補強壁(121e)(122e)が設けられている。
【００３９】
各ヒンジ手段(23)(24)(25)は、最上段の踏桟(105A)(106A)、前後足場板(21)(22)および連結部材(28)に、ヒンジ構成部(31)(32)(33)(34)(35)(36)(37)(38)を一体形成することにより得られており、中央ヒンジ手段(25)は、第１実施形態のものと全く同じ構成とされている。そして、前ヒンジ手段(123)は、前足場板(121)の前縁部に形成された第５ヒンジ構成部(135)と、前脚(1)の最上段の踏桟(105A)に形成された第６ヒンジ構成部(136)とよりなり、後ヒンジ手段(124)は、後足場板(122)の後縁部に形成された第７ヒンジ構成部(137)と、後脚(2)の最上段の踏桟(106A)に形成された第８ヒンジ構成部(138)とよりなる。
【００４０】
中央ヒンジ手段(25)には、第１実施形態と同じ符号を付してその説明を省略し、以下に、第５から第８までのヒンジ構成手段(135)(136)(137)(138)について説明する。
【００４１】
図１５および図１６に詳しく示すように、前後脚(1)(2)の最上段の踏桟(105A)(106A)は、略円形の横断面を有する筒状とされ、また、前足場板(121)の前壁(121a)および後足場板(122)の後壁(122b)は、いずれも横断面凹円弧状とされ、前足場板(121)の前壁(121a)の上縁部には、前方にのびる横断面円弧状の張出壁部(141)が設けられ、後足場板(122)の後壁(122b)の上縁部には、後方にのびる横断面円弧状の張出壁部(142)が設けられている。
【００４２】
前足場板(121)の前縁部には、前足場板(121)の前壁(121a)の前面および張出壁部(141)の内面によって、半円より大きい円の横断面円弧状内周面(143)が形成され、また、前足場板(121)の前壁(121a)の下縁と張出壁部(141)の先端とによって、踏桟(105A)を嵌め入れるための開口(144)が形成されており、第５ヒンジ構成部(135)は、これらの円弧状内周面(143)および開口(144)によって構成されている。踏桟(105A)は、第５ヒンジ構成部(135)の円弧状内周面(143)にほぼ等しい外径を有し、かつ、その略円筒状周壁の対向する部分が互いに平行となるように狭められており、第６ヒンジ構成部(136)は、この幅狭部(145)と、残りの円弧状外周面(146)とによって構成されている。幅狭部(145)の対向壁同士の間隔は、前後脚(1)(2)の左右支柱(3)(4)の側壁間隔に合わされており、幅狭部(145)の対向壁が支柱(3)の軸とほぼ平行となるように、踏桟(105A)(106A)が支柱(3)(4)の開口にきっちりと嵌め入れられている。
【００４３】
同様にして、後足場板(122)の後縁部には、後足場板(122)の後壁(122b)の後面および張出壁部(142)の内面によって、半円より大きい円の横断面円弧状内周面(147)が形成され、また、後足場板(122)の後壁(122b)の下縁と張出壁部(142)の先端とによって、踏桟(106A)を嵌め入れるための開口(148)が形成されており、第７ヒンジ構成部(137)は、これらの円弧状内周面(147)および開口(148)によって構成されている。踏桟(106A)は、第７ヒンジ構成部(137)の円弧状内周面(147)にほぼ等しい外径を有し、かつ、その略円筒状周壁の対向する部分が互いに平行となるように狭められており、第８ヒンジ構成部(138)は、この幅狭部(149)と、残りの円弧状外周面(150)とによって構成されている。
【００４４】
第５および第７ヒンジ構成部(135)(137)の開口(144)(148)は、幅狭部(145)(149)の対向壁同士の間隔より若干小さくなされており、図１７に示すように、例えば後足場板(122)を上から踏桟(106A)に嵌め合わせて回動させることにより、踏桟(106A)に取り付けることができる。したがって、支柱(3)(4)および踏桟(105A)(106A))により前後脚(1)(2)を組み立てた後に、足場板(121)(122)を脚(1)(2)に取り付けることができる。この後、連結部材(28)をスライドさせて両足場板(121)(122)の凹溝(41)(51)に嵌め入れればよい。
【００４５】
この作業床(111)によると、図１５に示した状態から、両足場板(121)(122)が逆Ｖ字状となるように力を加えると、前足場板(121)の後壁(121b)と後足場板(122)の前壁(122a)とが互いに開いていくとともに、前足場板(121)の前縁部および後足場板(122)の後縁部が最上段の踏桟(105A)(106A)の回りを回動し、最終的に、前足場板(121)が約９０°下方に回動し、後足場板(122)も約９０°下方に回動し、同時に、前後脚(1)(2)が前後足場板(121)(122)に対してそれぞれ約７５°回動することにより、図１６に示す折り畳み状態が得られる。踏桟(105A)(106A)の幅狭部(145)(149)が左右支柱(3)(4)の側壁に平行とされていることから、この回動中に前後足場板(121)(122)が踏桟(105A)(106A)から外れることはない。
【００４６】
サイドカバー(126)には、後足場板(122)の前後壁(122a)(122b)または補強壁(122e)に当てられる３つのカバーずれ防止部(127)が設けられている。そして、足場板がたつき防止部(128)は、踏桟(105A)(106A)にちょうど嵌め被せられる円筒状とされており、一端が前後足場板(121)(122)の左右端面に、他端が左右支柱(3)(4)の底壁に当接させられている。これにより、前後足場板(121)(122)の左右支柱(3)(4)に対する左右移動が阻止されている。図１４に示した後側の左サイドカバー(126)は、後足場板(122)の断面形状とほぼ同じ形状に形成されるとともに、その後面形状が、足場板がたつき防止部(128)の外周に沿うように変更させられている。前足場板(121)の右端面に被せられるサイドカバー(126)は、図示したものと同じ形状のもので、前足場板(121)の左端面および後足場板(122)の右端面に被せられるサイドカバー(126)は、図に示したものと対称に形成される。これらのサイドカバー(126)が前後足場板(121)(122)にタッピンねじ(27)で取り付けられることによって、前側のサイドカバー(126)は、連結部材(28)の前部を含む前足場板(121)の端面全面を覆い、後側のサイドカバー(126)は、連結部材(28)の後部を含む後足場板(122)の端面全面を覆い、これによって、連結部材(28)の前後足場板(121)(122)に対する左右移動が阻止されている。
【００４７】
こうして、この第２実施形態によると、踏桟(105A)(106A)および前後足場板(121)(122))の踏桟側の縁部の形状を複雑にすることなく、第５から第８までのヒンジ構成部(135)(136)(137)(138)が形成され、しかも、連結部材(28)および前後足場板(121)(122)のずれが防止される。
【図面の簡単な説明】
【図１】この発明による作業台を示す斜視図である。
【図２】同側面図である。
【図３】折畳んだ状態の作業台を示す側面図である。
【図４】第１実施形態の作業台の作業床を示す斜視図である。
【図５】使用状態における作業床を示す垂直断面図である。
【図６】折畳み状態における作業床を示す垂直断面図である。
【図７】中央ヒンジ手段を示す拡大垂直断面図である。
【図８】前ヒンジ手段を示す拡大垂直断面図である。
【図９】足場板を踏桟に取り付けるときの状態を示す垂直断面図である。
【図１０】作業台のキャスタ支持装置を示す斜視図である。
【図１１】同分解斜視図である。
【図１２】作業台が折畳まれたときのキャスタ支持装置を示す垂直断面図である。
【図１３】同水平断面図である。
【図１４】第２実施形態の作業台の作業床を示す斜視図である。
【図１５】使用状態における作業床を示す垂直断面図である。
【図１６】折畳み状態における作業床を示す垂直断面図である。
【図１７】足場板を踏桟に取り付けるときの状態を示す垂直断面図である。
【符号の説明】
(1)(2) 前後脚
(3)(4) 左右支柱
(5)(6) 踏桟
(5A)(6A) 最上段の踏桟踏桟
(7)(8) 連結部材
(11) 作業床
(12) 安全バー
(13) キャスタ
(14) キャスタ支持装置
(21) 前足場板
(22) 後足場板
(23) 前ヒンジ手段
(24) 後ヒンジ手段
(25) 中央ヒンジ手段
(26) サイドカバー
(26b) 足場板がたつき防止部
(28) 連結部材
(31) 第１ヒンジ構成部
(32) 第２ヒンジ構成部
(33) 第３ヒンジ構成部
(34) 第４ヒンジ構成部
(35) 第５ヒンジ構成部
(36) 第６ヒンジ構成部
(37) 第７ヒンジ構成部
(38) 第８ヒンジ構成部
(81) 固定ブラケット
(82) 可動ブラケット
(83) 連結ピン
(84) 圧縮コイルばね（弾性部材）
(97) 開き止め用係合部
(105A)(106A) 最上段の踏桟踏桟
(111) 作業床
(121) 前足場板
(122) 後足場板
(123) 前ヒンジ手段
(124) 後ヒンジ手段
(126) サイドカバー
(128) 足場板がたつき防止部
(135) 第５ヒンジ構成部
(136) 第６ヒンジ構成部
(137) 第７ヒンジ構成部
(138) 第８ヒンジ構成部
(143) 横断面円弧状内周面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work table, and more particularly, to a work table that can be used in place of a stepladder and has improved safety and workability compared to a stepladder.
[0002]
[Prior art]
A pair of front and rear legs consisting of left and right struts and a plurality of steps crossed between the left and right struts, a top plate provided at the upper end of the front and rear legs, and the upper ends of the front and rear legs can be rotated with each other A stepladder including a connecting member to be connected is well known in the art.
[0003]
[Problems to be solved by the invention]
With this type of stepladder, work standards are set so as not to work while standing on the top, but work may be performed without observing this standard, and improving safety is an issue. Yes.
[0004]
An object of the present invention is to provide a work table having higher safety and higher work efficiency than conventional stepladders.
[0005]
[Means for Solving the Problems and Effects of the Invention]
The work table according to the present invention includes a pair of front and rear legs formed of a left and right support column and a plurality of step bars secured between the left and right support columns, and a connecting member that connects the upper end portions of the front and rear legs so as to be able to rotate with each other. And a working floor secured between the upper and lower legs of the front and rear legs. The working floor includes a front scaffolding plate rotatably attached to the front leg of the front leg via a front hinge means, and a rear leg. A rear scaffolding plate pivotally attached to the pedestal via a rear hinge means, and a central hinge means for foldably coupling the two scaffolding boards together. The central hinge means is connected to the first hinge component provided at the rear edge of the front scaffold plate, the second hinge component provided at the front edge of the rear scaffold plate, and the first hinge component. A connecting member having a third hinge component that is movably fitted and a fourth hinge component that is pivotally fitted to the second hinge component, wherein the front hinge means is located in front of the front scaffold plate. The rear hinge means is composed of a fifth hinge constituent part provided at the edge and a sixth hinge constituent part provided on the front pedestal and rotatably fitted to the fifth hinge constituent part. A seventh hinge constituent part provided at the rear edge of the scaffolding plate, and an eighth hinge constituent part provided on the back leg of the rear leg and rotatably fitted to the seventh hinge constituent part. Features Is.
[0006]
According to the workbench of the present invention, the worker works on the work floor instead of the top board, and the safety is ensured. In addition, after the work is finished, the legs and the work floor can be folded so that the front and rear legs are substantially parallel to each other, so that the work can be stored in a small space.
[0007]
It is preferable that a safety bar is secured between the upper ends of the left and right struts of the front leg. If it does in this way, an operator will be prevented from falling by the safety bar, and the operation by holding the safety bar by hand will be possible, thereby further improving safety.
[0008]
A caster used for transporting the folded work table is attached to one of the front and rear legs via a support device. The caster support device is a lower end portion of the left and right support columns of either the front or rear leg. A movable bracket attached to the stationary bracket so as to be able to rotate about an axis that supports the caster and is substantially parallel to the length direction of the column. The caster can be rotated to the caster use position that protrudes outward in the front-rear direction and the caster storage position that does not protrude, and the left and right sides of the leg that has no fixed bracket attached to the movable bracket when it is in the caster storage position There may be provided an opening-preventing engagement portion that engages with the lower end portion of the column. In this way, the caster can be easily transported before and after using the workbench, and during storage, the movable bracket supporting the caster can be rotated to store the caster without obstructing it. At the same time, it is possible to prevent the opening and closing legs from opening and closing without providing separate opening stoppers by engaging the opening engaging parts with the lower ends of the left and right struts of the legs to which the fixing bracket is not attached. Is fulfilled.
[0009]
The fixed bracket and the movable bracket are coupled to each other by a coupling pin that is urged upward or downward by an elastic member, and the coupling pin prevents the movable bracket from rotating by moving in the urging direction. It is preferable to be able to move to a lock position and an unlock position that allows its rotation by being pushed in the direction opposite to the urging direction. In this way, the caster can be easily switched between the housed state and the used state by simply pressing the connecting pin.
[0010]
Each hinge means may be a hinge, but a connecting member is interposed between the front and rear scaffolding plates, and the step rail, the front and rear scaffolding plates and the connecting member are made of extruded molds, and each hinge component is formed integrally therewith. It is preferable to do. For example, the central hinge means is connected to the first hinge component provided at the rear edge of the front scaffold plate, the second hinge component provided at the front edge of the rear scaffold plate, and the first hinge component. And a connecting member having a third hinge component that is movably fitted and a fourth hinge component that is pivotally fitted to the second hinge component, and is provided at the rear edge of the front scaffolding plate. The first hinge component, the second hinge component provided on the front edge of the rear scaffolding plate, the first hinge component fitted to the front part of the connecting member and rotatably fitted to the first hinge component. And a third hinge constituent part and a fourth hinge constituent part that is provided at the rear part of the connecting member and is rotatably fitted to the second hinge constituent part, and the front hinge means is provided at the front edge part of the front scaffolding plate. A fifth hinge component provided on the front leg and a fifth hinge The rear hinge means is provided on the rear hinge of the rear scaffolding plate and the seventh leg of the rear leg plate. A side cover is provided on the left and right end faces of the front and rear scaffolding plates for restricting the left and right movement of the connecting member relative to the front and rear scaffolding plates. There is a scaffolding plate that regulates the lateral movement of the front and rear scaffolding plates with respect to the left and right support posts between the front end portion of the front scaffolding plate and the left and right support posts of the front leg and between the rear end portion of the rear scaffolding plate and the left and right support posts of the rear leg. It is set as the structure by which the anti-rattle part is interposed. In this way, since the front and rear scaffolding plates can be coupled to each other via the coupling member simply by sliding the coupling member relative to the front and rear scaffolding plates, the assembly man-hour can be reduced, and the side cover prevents the coupling member from coming off. As a result, the back-and-forth movement of the front / rear scaffolding plate is restricted by the anti-shattering part of the scaffolding plate, and rattling of the scaffolding plate is prevented.
[0011]
A front and rear scaffolding plate rattling prevention portion is provided integrally with the side cover, and a front scaffolding plate rattling prevention portion is provided with a hinge construction portion that is rotatably fitted to the sixth hinge construction portion. In some cases, the back side scaffolding plate is provided with a hinge preventing part that is rotatably fitted to the eighth hinge constituting part. In this way, the side cover can serve not only for preventing the connecting member from coming off, but also for preventing the scaffold plate from rattling and for positioning the scaffold plate, so that the number of parts can be reduced.
[0012]
Further, the fifth hinge component and the seventh hinge component have a hook shape having an arcuate inner circumferential surface that is larger than a semicircle, and the sixth hinge component and the eighth hinge component are substantially cylindrical. In some cases, the opposing portions of the peripheral wall are formed by narrowing rails. In this case, the arc surfaces of the sixth hinge component and the eighth hinge component are positioned above and below, and the fifth hinge component and the seventh hinge component are fitted to these from above. Therefore, when the fifth hinge component and the seventh hinge component are rotated by a predetermined angle with respect to the sixth hinge component and the eighth hinge component from the normal use state, they can be removed (and thus attached). Possible). If it does in this way, the structure of a hinge means will become simple and a component shape can be simplified. In this case, the rattling prevention part of the scaffolding plate is formed in a cylindrical shape and is fitted on the step rail, and is interposed between the fifth and seventh hinge constituent parts and the left and right support columns.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In this specification, front and rear and left and right are viewed from a person who performs work on a table.
[0014]
As shown in FIGS. 1 to 3, the work table according to the present invention has a plurality of (four-stage) crosspieces (5 steps) secured between the left and right support columns (3), (4) and the support columns (3), (4) (5 ) (5A) (6) (6A) pair of front and rear legs (1) (2) and the upper ends of the front and rear legs (1) (2) fixed to the upper ends of the left and right posts (3) (4) Connecting members (7) and (8) for connecting the pivots to each other, strut ends (9) and (10) covering the lower ends of the respective struts (3) and (4), and front and rear legs (1) A rectangular work floor (11) secured between the step rails (5A) and (6A) at the top (in this embodiment) of the upper part of (2) and the left and right struts (3) of the front legs (1) A safety bar (12) secured between the upper ends of the left and right ends of the left and right columns (4) of the rear legs (2), and a transport caster (13) attached to the lower ends of the rear legs (2) via caster support devices (14). It has.
[0015]
As shown in FIG. 2, this work table stands on the work floor (11) and performs work. After use, the work floor (11) is folded and casters ( It is designed to be easily carried using 13).
[0016]
Each strut (3) (4) and step pier (5) (5A) (6) (6A) are all made of extruded aluminum, and each strut (3) (4) is formed in a U-shaped cross section. Each of the step bars (5), (5A), (6) and (6A) is formed in a hollow shape having a substantially trapezoidal cross section.
[0017]
As shown in FIGS. 4 to 6, the work floor (11) is located between the front and rear scaffolding plates (21) (22) and the front and rear scaffolding plates (21) (22) made of rectangular aluminum extrusions that are long on the left and right. And a front and rear side covers (26) made of synthetic resin and covering the left and right end faces of the front and rear scaffolding plates (21) and (22). As will be described later, the front scaffolding plate (21) is rotatably attached to the uppermost step rail (5A) of the front leg (1) via the front hinge means (23), and the rear scaffolding plate (22) The rear leg (2) is pivotally attached to the uppermost step rail (6A) via the rear hinge means (24), and the two scaffolding plates (21, 22) are connected to the central hinge means ( 25) is foldably connected in an inverted V shape.
[0018]
The front and rear scaffolding plates (21, 22) are formed in a hollow shape with a substantially square cross section having front and rear walls (21a) (21b) (22a) (22b) and upper and lower walls (21c) (21d) (22c) (22d). Two reinforcing walls (21e) (22e) are provided between the front walls (21a) (22a) and the rear walls (21b) (22b).
[0019]
Each hinge means (23) (24) (25) is connected to the uppermost step rail (5A) (6A), the front and rear scaffolding plates (21) (22) and the connecting member (28), the hinge component (31) ( 32) (33) (34) (35) (36) (37) (38) are integrally formed. That is, the central hinge means (25) includes a first hinge component (31) formed at the rear edge of the front scaffold plate (21) and a second hinge formed at the front edge of the rear scaffold plate (22). A hinge component (32), a third hinge component (33) formed at the front of the coupling member (28), and a fourth hinge component (34) formed at the rear of the coupling member (28); The front hinge means (23) is formed on the fifth hinge component (35) formed on the front edge of the front scaffolding plate (21) and the uppermost step rail (5A) of the front leg (1). The rear hinge means (24) comprises a seventh hinge constituent part (37) formed on the rear edge of the rear scaffold plate (22) and a rear leg (2 ) And the eighth hinge component (38) formed on the uppermost step rail (6A).
[0020]
As shown in detail in FIGS. 5 and 6, the lower surface of the rear edge of the front scaffolding plate (21) is provided with a recessed groove (41) opened rearward, and the front edge of the rear scaffolding plate (22). A concave groove (51) opened forward is provided on the lower surface. The concave groove (41) of the front scaffolding plate (21) is formed by a concave arcuate curved wall portion (42) and a linear wall portion (43) extending rearward from the lower edge thereof. A groove (44) having a C-shaped cross section for screwing a tapping screw (27) (see FIG. 4) for attaching the cover (26) is formed on the outer periphery of the curved wall portion (42). Similarly, the concave groove (51) of the rear scaffold plate (22) is formed by a concave arcuate curved wall portion (52) and a linear wall portion (53) extending forward from the lower edge thereof. On the outer periphery of the curved wall portion (52), a C-shaped groove (54) for screwing a tapping screw (27) for attaching the side cover (26) is formed. As shown in an enlarged view in FIG. 7, the connecting member (28) is composed of a horizontal upper wall (28a) and front and rear walls (28b) (28c) having a bowl-shaped cross section. In the state, the front part is fitted into the concave groove (41) of the front scaffolding plate (21) and the rear part is fitted into the concave groove (51) of the rear scaffolding plate (22) so as to be relatively rotatable. It is put. The rear walls of the straight walls (43) and (53) of the concave grooves (41) and (51) extend upward and are engaged with the lower edges of the front and rear walls (28b) and (28c) of the connecting member (28). Engaging engaging portions (45) and (55) are provided.
[0021]
In addition, a concave groove (61) opened rearward is provided on the upper surface of the uppermost step rail (5A) of the front leg (1), and the uppermost step rail (6A) of the rear leg (2) is provided. A concave groove (71) opened forward is provided on the upper surface. Each of the concave grooves (61) (71) is formed by two arcuate curved walls (62) (63) (72) (73). Then, on the upper surface of the front edge portion of the front scaffolding plate (21), a convex portion (64) that is rotatably fitted in the concave groove (61) of the uppermost step rail (5A) of the front leg (1). ) Is provided to project forward, and the upper surface of the rear edge of the rear scaffolding plate (22) can be rotated relative to the groove (71) of the uppermost step rail (6A) of the rear leg (2). A convex part (74) to be fitted to the rear part is provided in a rearward protruding shape. Each convex part (64) (74) consists of a short linear wall part (65) (75) and a long circular arc-shaped wall part (66) (76). In the use state of the workbench shown in FIG. 5, the end surfaces of the arcuate walls (66) and (76) are made to contact the inner surfaces of the concave grooves (61) and (71).
[0022]
As shown in FIG. 7, the front wall (28b) of the connecting member (28) has a bent portion (46) having a cross-sectional arc shape bent forward and downward, and a backward folded shape connected to the front edge of the bent portion (46). The rear wall (28c) consists of an engagement part (47), and the rear wall (28c) has a bent part (48) with a circular cross section bent backward and downward, and a forward folded engagement connected to the rear edge of the bent part (48). Part (49). The third hinge component (33) includes a small-diameter arcuate surface (47a) provided at the rear edge of the folded engagement portion (47) and having a circumferential surface of the second half of the circle centered on the point A, The portion (46) has a large-diameter arcuate surface (46a) which is provided on the outer periphery and has a quarter-circumferential circumferential surface concentric with the small-diameter arcuate surface (47a). The first hinge component (31) is provided on the inner periphery of the curved wall (42) of the concave groove (41) and is formed on the large-diameter arcuate surface (46a) of the third hinge component (33). A large-diameter arc-shaped surface (42a) having a circumferential surface of a quarter circle with substantially the same radius of curvature, and provided from the upper surface of the rear edge of the straight wall portion (43) to the base of the engaging portion (45). The third hinge component (33) has a small-diameter arc-shaped surface (43a) having a quarter-circular circumferential surface having a substantially equal curvature radius on the small-diameter arc-shaped surface (47a).
[0023]
The second hinge component (32) and the fourth hinge component (34) are formed so as to be symmetric with respect to the first hinge component (31) and the second hinge component (32). That is, the fourth hinge component (34) is provided with a small-diameter arcuate surface (49a) having a circumferential surface of a rear half portion of a circle centered on the point B and provided at the rear edge of the folded engagement portion (49). And a large-diameter arcuate surface (48a) that is provided on the outer periphery of the bent portion (48) and has a quarter-circumferential circumferential surface concentric with the small-diameter arcuate surface (49a). The second hinge component (32) is provided on the inner periphery of the curved wall (52) of the concave groove (51) and on the large-diameter arcuate surface (48a) of the fourth hinge component (34). A large-diameter arc-shaped surface (52a) having a circumferential surface of a quarter circle with substantially the same radius of curvature, and the rear surface of the straight wall (53) from the upper surface of the engaging portion (55) to the base of the engaging portion (55) In addition, a small-diameter arc-shaped surface (53a) having a circumferential surface of a quarter circle having substantially the same radius of curvature is provided on the small-diameter arc-shaped surface (49a) of the fourth hinge component (34).
[0024]
As shown in FIG. 8, at the front edge of the short straight wall portion (65) of the convex portion (64) of the front scaffolding plate (21), the front half portion of the circle centering on the point C and the lower half portion of the rear half portion. A bulge part (67) having a circumferential surface of the part is formed, and the fifth hinge component part (35) includes an outer peripheral surface (67a) of the bulge part (67) and a long arcuate wall part (66). An arcuate inner circumferential surface (66a) and an arcuate outer circumferential surface having a circumferential surface of a circle larger than a quarter provided on the inner and outer circumferences of the bulge portion (67) and concentric with the outer circumferential surface (67a) 66b). The sixth hinge component (36) is provided on the upper surface of the upper curved wall (62) forming the concave groove (61) of the uppermost step rail (5A) of the front leg (1) and bulges. A small-diameter concave arcuate surface (62a) having a semicircular circumferential surface having substantially the same radius of curvature on the outer peripheral surface (67a) of the portion (67), and a fifth hinge provided on the lower surface of the curved wall portion (62) Convex arcuate surface (62b) having a semicircular circumferential surface with a substantially equal curvature radius on the arcuate inner peripheral surface (66a) of the component (35), and the uppermost step rail (5A) of the front leg (1) A quarter circle provided on the lower curved wall (63) forming the concave groove (61) and having a radius of curvature substantially equal to the arcuate outer peripheral surface (66b) of the fifth hinge component (35) And a large-diameter concave arcuate surface (63a) having a circumferential surface.
[0025]
The seventh hinge component (37) and the eighth hinge component (38) are formed so as to be symmetrical with the fifth hinge component (35) and the sixth hinge component (36).
[0026]
In the use state in which the work table shown in FIG. 5 is opened, the rear wall (21b) of the front scaffolding plate (21) and the front wall (22a) of the rear scaffolding plate (22) are brought into contact with each other, and the front leg (1) The arc-shaped wall (66) of the convex part (64) of the front scaffolding plate (21) is fitted into the concave groove (61) of the uppermost step rail (5A), and the uppermost step of the rear leg (2) By fitting the arcuate wall (76) of the convex portion (74) of the rear scaffold plate (22) into the concave groove (71) of the crosspiece (6A), the front scaffold plate (21) and the rear scaffold plate (22 ) Is prevented from rotating upward with respect to the connecting member (28), and the front and rear legs (1) and (2) rotate relative to the front scaffolding plate (21) and the rear scaffolding plate (22). It is also prevented from doing. From this state, when a force is applied so that the two scaffold plates (21) and (22) have an inverted V shape, as shown in FIGS. 7 and 8, the rear wall (21b) of the front scaffold plate (21) is formed. ) And the front wall (22a) of the rear scaffold plate (22) open to each other, and the front and rear scaffold plates (21) (from the recessed grooves (61) (71) of the uppermost step rails (5A) (6A) 22) the convex portions (64) and (74) come out, and finally the front scaffolding plate (21) pivots about 90 ° downward, and the rear scaffolding plate (22) also pivots about 90 ° downward, At the same time, the front and rear legs (1) and (2) rotate about 75 ° relative to the front and rear scaffolding plates (21) and (22), respectively, so that the folded state shown in FIG. 6 is obtained.
[0027]
In FIG. 4, the left and right widths of the front and rear scaffold plates (22) are narrower than the inner method between the left and right support columns (3) and (4), and the side covers (26) covering the left end surface of the rear scaffold plates (22) ) Includes three cover slip prevention portions (26a) applied to the front and rear walls (22a) (22b) or the reinforcing wall (22e) of the rear scaffold plate (21), and the rear end portion of the rear scaffold plate (22) The scaffold plate that is fitted between the left and right support columns (4) of the rear leg (2) and restricts the left and right movement of the rear scaffold plate (22) relative to the left and right support columns (4) Is provided. The scaffolding plate rattling prevention part (26b) is formed so that the cross-sectional shape thereof is the same as the cross-sectional shape of the convex part (74) of the rear scaffolding plate (22). A hinge component that is pivotably fitted to the eighth hinge component (38) is formed in the rattling prevention portion (26b) of the side cover (26). The side cover (26) that covers the right end surface of the front scaffolding plate (21) has the same shape as shown in the figure, and covers the left end surface of the front scaffolding plate (21) and the right end surface of the rear scaffolding plate (22). The side cover (26) is formed symmetrically to that shown in the figure. In this way, a hinge component portion that is rotatably fitted to the sixth hinge component portion (36) is formed in the rattling prevention portion (26b) of the front side scaffolding plate. The front side cover (26) covers the entire end face of the front scaffolding plate (21) including the front part of the connecting member (28), and the rear side cover (26) is the rear part of the connecting member (28). The entire end face of the rear scaffold plate (22) including is covered so that the right and left movement of the connecting member (28) with respect to the front and rear scaffold plates (21) and (22) is prevented.
[0028]
The front and rear scaffolding plates (21, 22) are removed from the step bars (5A) (6A) by rotating them by a predetermined angle (about 110 °) or more with respect to the step bars (5A) (6A). Can do. Therefore, as shown in FIG. 9, in a state where it is rotated by a predetermined angle or more, the scaffolding plate (22) is approached from above along the column (4) and is applied to the foot crossing (5 A) (6 A), and the folding direction By rotating this in the opposite direction, the curved wall portion (76) of the convex portion (74) of the scaffolding plate (22) is fitted into the concave groove (71) of the step rail (5A) (6A). be able to. The connecting member (28) is slidable with respect to the front and rear scaffolding plates (21, 22), and the front leg (1) with the front scaffolding plate (21) and the rear leg with the rear scaffolding plate (22) ( 2), and the connecting member (28) is slid and fitted into the concave grooves (41), (51) of the two scaffolding plates (21, 22). 21) Legs (1) and (2) with (22) are connected. Thereafter, the work table can be easily assembled by covering the side cover (26).
[0029]
According to this workbench, as shown in FIG. 2, the worker can perform stable work on the wide work floor (11) and, if necessary, grasp the safety bar (12) by hand. Therefore, safer work can be performed. Then, after use, the work floor (11) is folded in an inverted V shape, and the front and rear legs (1) and (2) are stacked so that they are substantially parallel to each other, so that the work floor (11) can be stored compactly.
[0030]
As shown in FIGS. 10 to 13, the caster support device (14) supports the fixed bracket (81) attached to the lower ends of the left and right struts (4) of the rear leg (2) and the casters (13). And a movable bracket (82) supported by the fixed bracket (81), a connecting pin (83) for connecting both brackets (81) and (82), and a compression coil spring (84) fitted to the connecting pin (83). ) And a wing bolt (85) for attaching the fixing bracket (81) to the column (4).
[0031]
The fixing bracket (81) has a U-shaped mounting part (91) consisting of an inner wall (91a), an outer wall (91b) and a rear wall (91c), and a central part of the upper and lower edges of the outer wall (91b) of the mounting part (91). And a connecting portion (92) composed of a pair of upper and lower opposing walls (92a) and (92b) projecting outward. A bolt insertion hole (93) is formed in the front end portion of the outer wall (91b) of the attachment portion (91), and a through female screw portion (94) is provided in the front end portion of the inner wall (91a). The fixing bracket (81) has its mounting part (91) fitted to the column (4) from the rear and its inner and outer walls (91a) (91b) sandwiching the column (4) with the bolts on the outer wall (91b) The butterfly bolt (85) passed from the outside through the insertion hole (93) is screwed into the female thread portion (94) of the inner wall (91a), thereby being detachably attached to the support column (4).
[0032]
The movable bracket (82) has a U-shaped caster mounting part (95) consisting of an inner wall (95a), an outer wall (95b) and a front wall (95c), and forward from the front wall (95c) of the caster mounting part (95). A connecting portion (96) composed of a pair of upper and lower opposed walls (96a) (96b) protruding, and a pair of front and rear opposed walls (97a) (97b) projecting inward from the inner wall (95a) of the caster mounting portion (95) And an engagement portion (97) for preventing the opening.
[0033]
The connecting pin (83) includes a shaft portion (98) and a head portion (99) provided at the lower end of the shaft portion (98). An annular groove (98a) is provided at an intermediate portion of the shaft portion (98), and a pair of front and rear projections (99a) and (99b) protruding upward are provided at the head portion (99).
[0034]
The opposing wall (92a) (92b) of the connecting part (92) of the fixed bracket (81) and the opposing wall (96a) (96b) of the connecting part (96) of the movable bracket (82) are each provided with a connecting pin insertion hole ( (100) (101) is provided, the fixed bracket (81) and the movable bracket (82), the respective connecting portions (92) (96) are overlapped, their opposing walls (92a) (92b ) (96a) and (96b) are connected to the pin insertion holes (100) and (101) by inserting the connecting pin (83) from below. As a result, the movable bracket (82) is rotatable with respect to the fixed bracket (81) about the axis of the connecting pin (83). The front-rear width of each opposing wall (92a) (92b) of the connecting portion (92) of the fixed bracket (81) is the front-rear width of each opposing wall (96a) (96b) of the connecting portion (96) of the movable bracket (82). The connecting portions (92) and (96) are arranged so that the opposing walls (96a) and (96b) of the movable bracket (82) sandwich the opposing walls (92a and 92b) of the fixed bracket (81). In addition, the opposing walls (92a), (92b), (96a), and (96b) are overlapped with each other so that the front edges thereof coincide with each other. A square notch (102) (103) is provided at the same position on the front edge of each facing wall (92a) (92b) (96a) (96b), and further, it faces the fixed bracket (81). A square notch (104) is provided at the rear edge of the wall (92a) (92b), and a square penetration is located near the rear edge of the opposing wall (96a) (96b) of the movable bracket (82). A hole (105) is provided.
[0035]
The front and rear protrusions (99a) and (99b) of the head (99) of the connecting pin (83) are usually (when using the workbench and when transporting), and the front protrusion (99a) is on each opposing wall (92a) (92b) (96a) (96b) front notch (103) (102), rear projection (99b) fits into the rectangular through hole (105) on the lower facing wall (96b) of the movable bracket (82) Matching. In this state, the annular groove (98) of the shaft portion (98) is positioned below the opposing wall (92a) on the upper side of the fixed bracket (81), and an annular spring support is formed on the shaft portion (98). The plate (86) is fitted and its upward movement is prevented by a retaining ring (87) fitted in the annular groove (98a).
[0036]
The compression coil spring (84) is received by the spring receiving plate (86) of the connecting pin (83) and the upper surface of the lower facing wall (92b) of the fixing bracket (81), and the connecting pin (83) faces upward. Is energized. The connecting pin (83) biased by the compression coil spring (84) has its top surface (99) contacted with the lower surface of the opposing wall (96b) on the lower side of the connecting portion (96) of the movable bracket (82). The contact prevents the upward movement. In this state, as described above, the protrusion (99a) in front of the head (99) of the connecting pin (83) is notched in the lower facing walls (92b) (96b) of both brackets (81) (82). By fitting in both (102) and (103), rotation of the movable bracket (82) relative to the fixed bracket (81) is prevented. The distance from the shaft of the connecting pin (83) to the front protrusion (99a) is smaller than the distance to the rear protrusion (99b), and the height of the front protrusion (99a) is The height of the rear projection (99b) is made smaller than the height of the rear projection (99b), and the tip of the shaft portion (98) of the connecting pin (83) is located on the upper facing wall (96a) of the movable bracket (82). ) Is larger than the amount protruding from. Therefore, by pressing the tip of the connecting pin (83) downward, the front protrusion (99a) does not engage with the notch (102) on the lower opposing wall (92b) of the fixing bracket (81), that is, It can be moved to the unlock position. Since the rear protrusion (99b) does not hinder the rotation of the movable bracket (82), when the connecting pin (83) is in the unlocked position, the movable bracket (82) is not connected to the shaft of the connecting pin (83). As shown by the arrows in FIGS. 10 and 13, it can be rotated about 180 °. At this time, as shown by a chain line in FIG. 12 and FIG. 13, the locking stop engaging portion (97) of the movable bracket (82) is fitted into the opening of the column (3) having a U-shaped cross section of the front leg (1). . This prevents the front and rear legs (1) and (2) from moving away from each other. Here, the connecting pin (83), the subsequent projection (99b) is fitted in the through hole (105) of the opposing wall (96b) on the lower side of the connecting portion (96) of the movable bracket (82), When the movable bracket (82) is rotated and the movable bracket (82) is rotated by 180 °, the front protrusion (99a) is notched behind the lower opposing wall (92b) of the fixed bracket (81). (104), thereby preventing the movable bracket (82) from rotating relative to the fixed bracket (81). Thus, the caster (13) can be moved from the use position to the stowed position, and the caster (13) is stowed so that the front and rear legs (1) and (2) can be opened without providing separate stoppers. The stop is fulfilled.
[0037]
14 to 17 show a second embodiment of the work table. As shown in FIGS. 14 to 16, the work floor (111) of this work table is rotatably attached to the uppermost step rail (105A) of the front leg (1) via the front hinge means (123). The front scaffolding plate (121), the rear scaffolding plate (122) attached to the uppermost step rail (106A) of the rear leg (2) via the rear hinge means (124), and both legs. Center hinge means (25) for connecting the field plates (121) and (122) to each other so that they can be folded in an inverted V shape, and front and rear sides made of synthetic resin covering the left and right end surfaces of the front and rear scaffold plates (121) and (122) A cover (126) and a synthetic resin scaffolding plate fitted on the left and right end portions of the uppermost step rail are made of a rattling prevention portion (128). An aluminum extruded profile connecting member (28) is interposed between the two scaffold plates (121) (122).
[0038]
Front and rear scaffold plates (121) (122) are made of extruded aluminum and have front and rear walls (121a) (121b) (122a) (122b) and upper and lower walls (121c) (121d) (122c) (122d) It is formed in a substantially rectangular hollow shape, and two reinforcing walls (121e) (122e) are provided between the front walls (121a) (122a) and the rear walls (121b) (122b).
[0039]
Each hinge means (23) (24) (25) is connected to the uppermost step rail (105A) (106A), the front and rear scaffolding plates (21) (22) and the connecting member (28), the hinge component (31) ( 32) (33) (34) (35) (36) (37) (38) are obtained by integrally forming, and the central hinge means (25) has the same configuration as that of the first embodiment. Has been. The front hinge means (123) is formed on the fifth hinge component (135) formed on the front edge of the front scaffolding plate (121) and the uppermost step rail (105A) of the front leg (1). The rear hinge means (124) includes a seventh hinge component (137) formed on the rear edge of the rear scaffold plate (122) and a rear leg (2). And an eighth hinge component (138) formed on the uppermost step (106A).
[0040]
The central hinge means (25) is given the same reference numerals as in the first embodiment, and the description thereof is omitted. Hereinafter, the fifth to eighth hinge constituting means (135) (136) (137) (138) ) Will be described.
[0041]
As shown in detail in FIGS. 15 and 16, the uppermost step bars (105A) and (106A) of the front and rear legs (1) and (2) have a cylindrical shape having a substantially circular cross section, and the front scaffolding plate The front wall (121a) of (121) and the rear wall (122b) of the rear scaffolding plate (122) are both concave arc-shaped in cross section, and the upper edge of the front wall (121a) of the front scaffolding plate (121) Is provided with an overhanging wall portion (141) having a cross-sectional arc shape extending forward, and an upper end portion of the rear wall (122b) of the rear scaffolding plate (122) is provided with an arc-shaped tension wall portion extending rearward. An exit wall (142) is provided.
[0042]
On the front edge of the front scaffolding plate (121), the front cross section of the front wall (121a) of the front scaffolding plate (121) and the inner surface of the overhanging wall portion (141) have a circular cross section that is larger than a semicircle. A peripheral surface (143) is formed, and an opening for fitting the stepped foot (105A) by the lower edge of the front wall (121a) of the front scaffolding plate (121) and the tip of the overhanging wall portion (141) (144) is formed, and the fifth hinge component (135) is constituted by the arc-shaped inner peripheral surface (143) and the opening (144). The crosspiece (105A) has an outer diameter substantially equal to the arcuate inner peripheral surface (143) of the fifth hinge component (135), and the opposed portions of the substantially cylindrical peripheral wall are parallel to each other. The sixth hinge component (136) is constituted by the narrow portion (145) and the remaining arcuate outer peripheral surface (146). The spacing between the opposing walls of the narrow part (145) is matched to the side wall spacing of the left and right struts (3) and (4) of the front and rear legs (1) and (2), and the opposing wall of the narrow part (145) is The step bars (105A) and (106A) are fitted into the openings of the columns (3) and (4) so as to be substantially parallel to the axis of (3).
[0043]
Similarly, the rear edge of the rear scaffold plate (122) is crossed by a circle larger than a semicircle by the rear surface of the rear wall (122b) of the rear scaffold plate (122) and the inner surface of the overhang wall portion (142). A circular arc-shaped inner peripheral surface (147) is formed, and the foot cross (106A) is fitted by the lower edge of the rear wall (122b) of the rear scaffolding plate (122) and the tip of the overhanging wall portion (142). An opening (148) for insertion is formed, and the seventh hinge component (137) is constituted by the arcuate inner peripheral surface (147) and the opening (148). The crosspiece (106A) has an outer diameter substantially equal to the arcuate inner peripheral surface (147) of the seventh hinge component (137), and the opposed portions of the substantially cylindrical peripheral wall are parallel to each other. The eighth hinge component (138) is constituted by the narrow portion (149) and the remaining arcuate outer peripheral surface (150).
[0044]
The openings (144) and (148) of the fifth and seventh hinge constituent parts (135) and (137) are slightly smaller than the interval between the opposing walls of the narrow parts (145) and (149), as shown in FIG. In this way, for example, the rear scaffold plate (122) can be attached to the stepped foot (106A) by fitting it to the stepped foot (106A) from above and turning it. Therefore, after assembling the front and rear legs (1) and (2) with the support pillars (3) and (4) and the pedestals (105A and 106A)), the scaffolding plates (121) and (122) are attached to the legs (1) and (2). Can be attached. Thereafter, the connecting member (28) may be slid and fitted into the concave grooves (41) (51) of the two scaffold plates (121) (122).
[0045]
According to this work floor (111), when force is applied from the state shown in FIG. 15 so that both scaffold plates (121) and (122) are in an inverted V shape, the rear wall of the front scaffold plate (121) ( 121b) and the front wall (122a) of the rear scaffold plate (122) open to each other, and the front edge of the front scaffold plate (121) and the rear edge of the rear scaffold plate (122) are the uppermost steps. (105A) (106A), and finally the front scaffolding plate (121) pivots about 90 ° downward, and the rear scaffolding plate (122) also pivots about 90 ° downward, When the front and rear legs (1) and (2) are rotated by about 75 ° with respect to the front and rear scaffolding plates (121) and (122), the folded state shown in FIG. 16 is obtained. Since the narrow part (145) (149) of the crosspiece (105A) (106A) is parallel to the side walls of the left and right support columns (3) (4), the front and rear scaffolding plates (121) ( 122) does not come off from the pedestals (105A) (106A).
[0046]
The side cover (126) is provided with three cover displacement prevention portions (127) applied to the front and rear walls (122a) (122b) or the reinforcing wall (122e) of the rear scaffold plate (122). Further, the rattling prevention part (128) of the scaffolding plate is formed in a cylindrical shape that is just fitted on the crosspiece (105A) (106A), one end is on the left and right end surfaces of the front and rear scaffolding plates (121) (122), The other end is brought into contact with the bottom wall of the left and right support columns (3) and (4). As a result, the lateral movement of the front and rear scaffolding plates (121) and (122) with respect to the left and right columns (3) and (4) is prevented. The rear left side cover (126) shown in FIG. 14 is formed in a shape substantially the same as the cross-sectional shape of the rear scaffold plate (122), and the rear surface shape thereof is a rattling prevention portion (128). It is made to change along the outer periphery. The side cover (126) that covers the right end surface of the front scaffolding plate (121) has the same shape as that shown in the figure, and covers the left end surface of the front scaffolding plate (121) and the right end surface of the rear scaffolding plate (122). The side cover 126 is formed symmetrically to that shown in the figure. By attaching these side covers (126) to the front and rear scaffold plates (121) and (122) with tapping screws (27), the front side cover (126) includes the front scaffolding including the front part of the connecting member (28). The entire end surface of the plate (121) is covered, and the rear side cover (126) covers the entire end surface of the rear scaffolding plate (122) including the rear portion of the connecting member (28), thereby the connecting member (28). Left-right movement with respect to the front and rear scaffolding plates (121) and (122) is prevented.
[0047]
Thus, according to the second embodiment, the fifth to eighth embodiments can be achieved without complicating the shape of the edges of the step rails (105A) (106A) and the front and rear scaffolding plates (121) (122)). Hinge components (135), (136), (137), and (138) are formed, and displacement of the connecting member (28) and the front and rear scaffolding plates (121) and (122) is prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a work table according to the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a side view showing the work table in a folded state;
FIG. 4 is a perspective view showing a work floor of the work table according to the first embodiment.
FIG. 5 is a vertical sectional view showing a work floor in a use state.
FIG. 6 is a vertical sectional view showing a work floor in a folded state.
FIG. 7 is an enlarged vertical sectional view showing a central hinge means.
FIG. 8 is an enlarged vertical sectional view showing a front hinge means.
FIG. 9 is a vertical cross-sectional view showing a state when the scaffolding plate is attached to the foot cross.
FIG. 10 is a perspective view showing a caster support device for a work table.
FIG. 11 is an exploded perspective view of the same.
FIG. 12 is a vertical sectional view showing the caster support device when the work table is folded.
FIG. 13 is a horizontal sectional view of the same.
FIG. 14 is a perspective view showing a work floor of the work table according to the second embodiment.
FIG. 15 is a vertical sectional view showing a work floor in a use state.
FIG. 16 is a vertical sectional view showing the work floor in a folded state.
FIG. 17 is a vertical cross-sectional view showing a state when the scaffolding plate is attached to the pedestal.
[Explanation of symbols]
(1) (2) Front and rear legs
(3) (4) Left and right props
(5) (6) Footbridge
(5A) (6A) Top step pedestal
(7) (8) Connecting member
(11) Work floor
(12) Safety bar
(13) Casters
(14) Caster support device
(21) Fore scaffolding board
(22) Rear scaffold board
(23) Front hinge means
(24) Rear hinge means
(25) Central hinge means
(26) Side cover
(26b) Scatter prevention part
(28) Connecting member
(31) First hinge component
(32) Second hinge component
(33) Third hinge component
(34) Fourth hinge component
(35) Fifth hinge component
(36) Sixth hinge component
(37) 7th hinge component
(38) 8th hinge component
(81) Fixing bracket
(82) Movable bracket
(83) Connecting pin
(84) Compression coil spring (elastic member)
(97) Locking engagement part
(105A) (106A) Top pedestal
(111) Work floor
(121) Fore scaffolding board
(122) Rear scaffold board
(123) Front hinge means
(124) Rear hinge means
(126) Side cover
(128) Scatter prevention part
(135) Fifth hinge component
(136) Sixth hinge component
(137) 7th hinge component
(138) Eighth hinge component
(143) Arc cross-section inner circumference

Claims

A pair of front and rear consisting of a plurality of step bars (5) (5A) (6) (6A) (105A) (106A) secured between the left and right columns (3) (4) and the left and right columns (3) (4) A connecting member (7) (8) for connecting the upper ends of the legs (1) (2) and the front and rear legs (1) (2) so that they can rotate with each other; and the front and rear legs (1) (2) Work floors (11) and (111) secured between the upper pedestals (5A), (6A), (105A) and (106A), and the work floors (11) and (111) are connected to the front legs (1) The front scaffolding plates (21) and (121), which are pivotally attached to the step rails (5A) and (105A) via the front hinge means (23) and (123), and the step rails (6A ) (106A) via the rear hinge means (24) (124), the rear scaffold plate (22) (122) and the two scaffold plates (21) (22) (121) (122) between Ri more Na central hinge means foldably couples (25) (25), a central hinge means (25), the first hinge structure portion provided on the rear edge of the front scaffolding plate (21) (31 and), and a second hinge component that is provided on the front edge of the rear scaffolding plate (22) (32), the first hinge structure The third hinge component (33) and the fourth hinge component that is fitted rotatably to the second hinge component (32) which is fitted rotatably on generating section (31) having (34) The front hinge means (23) (123) is composed of a connecting member (28), and fifth hinge components (35) (135) provided on the front edges of the front scaffolding plates (21) (121) , more and 踏桟the front leg (1) (5A) provided (105A) and fifth hinge component (35) (135) to the sixth hinge component that is fitted rotatably (36) (136) The rear hinge means (24) and (124) are connected to the seventh hinge constituent parts (37) and (137) provided at the rear edges of the rear scaffold plates (22) and (122) , and the rear legs (2) . And an eighth hinge component (38) (138) provided on the crosspiece (6A) (106A) and rotatably fitted to the seventh hinge component (37) (137) . Working table.

The workbench according to claim 1, wherein a safety bar (12) is secured between upper ends of the left and right support columns (3) of the front leg (1).

A caster (13) used for transporting the folded work table is attached to one of the front and rear legs (2) via a support device (14), and the caster support device (14) A fixed bracket (81) removably attached to the lower end of the left and right struts (4) of either the front or rear leg (2), and supports the casters (13) and is almost the same as the length of the strut (4) The movable bracket (82) is attached to the fixed bracket (81) so that it can rotate around a parallel axis, and the movable bracket (82) does not protrude from the caster use position protruding outward in the front-rear direction. The left and right struts (3) of the leg (1) on which the fixed bracket (81) is not attached to the movable bracket (82) when it is in the caster storage position can be rotated to the caster storage position. The operation according to claim 1 or 2, further comprising an engaging portion (97) for preventing the opening from engaging with the lower end portion. .

The fixed bracket (81) and the movable bracket (82) are connected by a connecting pin (83) that is urged either upward or downward by an elastic member (84), and the connecting pin (83) is in the urging direction. The movable bracket (82) can be moved to a lock position that prevents the rotation of the movable bracket (82) by being moved to an unlock position that is allowed to rotate by being pushed in a direction opposite to the urging direction. 3 workbench.

The right and left end faces of the front post scaffolding plate (21) (22) (121) (122), a side cover for restricting the lateral movement of the front and rear scaffolding plate (21) (22) (121) coupling member with respect to (122) (28) (26) (126) is attached, between the front end of the front scaffolding plate (21) and the left and right struts (3) of the front leg (1) and the rear end of the rear scaffolding plate (22) and the rear leg (2) Between the left and right struts (4) of the left and right struts (3) and (4). ) (128) is interposed. The workbench according to any one of claims 1 to 4.

The scaffolding plate anti-shaking part (26b) is provided integrally with the side cover (26), and the front-side scaffolding plate is pivotable to the anti-shaking part (26b) and the sixth hinge component (36). A hinge component that is fitted together is provided, and a hinge component that is rotatably fitted to the eighth hinge component (38) is provided in the backlash prevention portion (26c) of the scaffolding plate on the rear side. 6. The workbench of claim 5, wherein:

The fifth hinge component (135) and the seventh hinge component (137) have a hook shape having an arcuate inner peripheral surface (143) larger than a semicircle, and the sixth hinge component (136) and 6. The workbench according to claim 5, wherein the eighth hinge component (138) is formed by a step bar (105A) (106A) having a substantially cylindrical shape and narrowed portions facing the peripheral wall.