JP2004257146A

JP2004257146A - Folding workbench and auxiliary handrail used for same

Info

Publication number: JP2004257146A
Application number: JP2003050185A
Authority: JP
Inventors: Hideo Hanada; 英男花田
Original assignee: Sumikei Nikkei Engineering Co Ltd
Current assignee: Nippon Engineering Co Ltd
Priority date: 2003-02-27
Filing date: 2003-02-27
Publication date: 2004-09-16
Anticipated expiration: 2023-02-27
Also published as: JP4043972B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding workbench comprising a main handrail and an auxiliary handrail in consideration of a worker's safety, easily mounted to a handrail erected only at one long side of a top plate, mounted for right/left use to either short side of the top plate and compactly enclosed for storage. <P>SOLUTION: This folding workbench 1 comprises the top plate 2 of rectangular shape from the top view; a pair of leg parts 10 foldably mounted to short sides on both sides of the top plate 2; the main handrail 20 erected along one long side of the top plate 2; and the auxiliary handrail 30 with one end rotatably supported to the main handrail 20 on the side of one short side of the top plate 2. The auxiliary handrail 30 is provided with an upper bar 31, a lower bar 41 and a vertical bar 40 connecting the upper and lower bars. The upper bar 31 has both ends 39 of U-shaped cross section surrounding a handrail bar 26 of the main handrail 20 horizontally from the inside while cutting off a web 33 between a pair of upper and lower flanges 32, 34, and the upper and lower flanges 32, 34 of both ends 39 are provided with through holes 38 bored for rotating bolts 44 to pass through also the handrail bar 26 of the main handrail 20. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、作業用の天板を支持する一対の脚部が折畳式であり且つ安全性に優れた折畳式作業台およびこれに用いる補助手摺に関する。
【０００２】
【従来の技術】
建物の外壁や内壁あるいは天井を施工する際、作業者が作業床に乗って作業するための作業台が広く用いられている。また、作業者の安全を図るため、一対の脚体間に支持される作業床の長辺に沿って手摺をそれぞれ立設した作業台が提案されている（例えば、特許文献１参照）。
係る作業台６０は、図９に示すように、平面視が長方形の作業床６２、係る作業床６２の各短辺に図示しないブラケットを介して回転可能に取り付けた一対の脚体６４、および上記作業床６２の各長辺に沿って立設した一対の手摺７０を備えている。上記脚体６４は、図９に示すように、ほぼハ字形を形成する左右一対の脚柱６５と、これらの間に水平に固定した複数の踏み桟６６とからなり、中間の踏み桟６６と作業床６２の底面との間に架け渡した開度調整用のステー６８により、その開き角度を規制されている。
【０００３】
【特許文献１】
特開平１１−３３６４５５号公報（図２〜図４）
【０００４】
更に、手摺７０は、図９に示すように、作業床６２の四隅付近に固定された受け金具６９に下端を挿入して垂設する一対の支柱７２、係る支柱７２同士の上端間に水平に固定される手摺桟７４、および一対の支柱７２の中間に固定される補強桟７３からなる。
図９に示すように、一対の手摺７０における双方の手摺桟７４，７４間には、一対の開き止め金具７６が作業床６２の各短辺寄りの位置に配置されている。係る開き止め金具７６は、一対の手摺７０が互いに離間して外側に開く事態を防ぐため、一方の手摺７０の手摺桟７４に回転自在に支持される枢支部７８および板状の本体７７の先端から垂下し且つ他方の手摺７０の手摺桟７４に係止するフック７９からなる。
【０００５】
【発明が解決すべき課題】
ところで、前記作業台６０に用いられる開き止め金具７６は、前述の開きを防ぐと共に、作業床６２上に乗った作業員にとって、一対の手摺７０，７０の両端付近における転落防止用の補助手摺としても機能し得る。
しかし、前記開き止め金具７６は、作業床６２の長辺に沿って一対の手摺７０が必須であり、一方の手摺７０が回転中心で且つ他方の手摺７０にフック７９が係止するという左右が非対称で汎用性を欠く形態であると共に、作業台６０から手摺７０を取り外して保管する際に不安定な状態になり易く、更に既設の作業台６０の手摺７０に後から追加しにくい、などの不具合があった。
本発明は、以上に説明した従来の技術における問題点を解決し、作業者用の天板における一方の長辺にのみに立設する手摺にも容易に取付られ、且つ天板の両短辺に左右兼用で取付られ、コンパクトに収納して安定的に保管できるなど、作業者の安全を配慮した主手摺と補助手摺とを含む折畳式作業台およびこれに用いる補助手摺を提供することを課題とする。
【０００６】
【課題を解決するための手段および発明の効果】
本発明は、上記課題を解決するため、天板の長辺に沿って立設する主手摺に片持ちで回転可能且つ左右の取付部を対称に形成した補助手摺を取り付ける、ことに着想して成されたものである。
即ち、本発明の折畳式作業台（請求項１）は、平面視が長方形の天板と、係る天板の両側の短辺に折畳み可能に取付けた一対の脚部と、上記天板の少なくとも一方の長辺に沿って立設した主手摺と、上記天板の少なくとも一方の短辺寄りで且つ前記主手摺に一端が回転可能に支持される補助手摺とを含み、前記補助手摺は、上桟と、下桟と、係る上・下桟を連結する縦桟とを備え、前記上桟は、上記主手摺の手摺桟を内側から横向きに囲む断面コ字形で且つ一対の上・下フランジ間のウェブを切除した両端部を有し、係る両端部の上・下フランジには、上記主手摺の手摺桟と共に貫通する回転用ボルトまたはピンの貫通孔が穿孔されている、ことを特徴とする。
【０００７】
これによれば、天板における何れの長辺に沿って主手摺が立設されていても、係る主手摺の一端または両端に片持ち状態で補助手摺を回転可能に容易に支持でき、作業時には主手摺から補助手摺を水平に張り出して作業者の安全を図り、保管の際は補助手摺を主手摺に重ねた姿勢でコンパクトで安定した状態で収納することができる。従って、安全性および作業性に優れた折畳式作業台となる。
尚、天板、脚部、主手摺、および補助手摺の材質には、軽量で且つ所要強度を保つため、主にアルミニウム合金が用いられるが、これに限るものではない。尚また、補助手摺の縦桟は１本または２本以上としても良く、１本の場合は上・下桟の中央付近同士を連結するほぼエ字形の形態となり、２本の場合は上・下桟の両端寄りの位置同士を平行に連結するほぼロ字形の形態となる。尚更に、上記回転用ボルトは先端の雄ネジ部でナットとネジ結合するが、ボルト頭と雄ネジ部との間の軸部はピンとして機能する。尚また、主手摺および補助手摺は、天板に対して、取付けおよび取外しが一体に行えるユニット形式の手摺としても良い。
【０００８】
また、本発明には、前記補助手摺の上桟における両端部に位置する前記ウェブの端面は、当該補助手摺を前記主手摺からほぼ９０度水平回転した際に主手摺の手摺桟の側面に当接して上記補助手摺の上記回転を規制する、折畳式作業台（請求項２）も含まれる。
これによれば、天板の上に乗った作業者が主手摺から補助手摺を手前側に引き出しつつほぼ９０度水平回転した際、補助手摺の上桟の両端部のうち回転中心となった端部のウェブの端面が主手摺の手摺桟の側面に当接して、その回転が停止される。あるいは、補助手摺の回転が当初９０度よりも小さい状態であっても、例えば作業者の身体や腕が当たることにより、上記ウェブの端面が主手摺の手摺桟の側面に当接して停止する。従って、天板の短辺寄りの位置における安全性を一層確実に図ることが可能となる。尚、補助手摺の下桟も上桟と同様の断面コ字形で上・下フランジ間のウェブを切除した両端部を有するものとしても良い。
【０００９】
更に、本発明には、前記主手摺は、少なくとも前記天板の長辺の両端付近から立設する一対の支柱と、係る一対の支柱の上端同士間を連結する前記手摺桟と、前記一対の支柱の中間同士間または下部同士間を連結する水平桟とを備え、前記補助手摺の下桟における少なくとも一端には、上記主手摺の支柱の側面に固定した金具と共に貫通する下部回転用ボルトまたはピンの貫通孔が穿孔されている、折畳式作業台（請求項３）も含まれる。
これによれば、補助手摺の下桟は、その両端に設けた貫通孔の何れかに主手摺の支柱の側面に固定したＬ字形などの金具の水平片を貫通する回転用ボルトやピンが貫通して回転可能に支持される。従って、補助手摺は、上・下桟の両方の端部において水平回転可能に支持されるため、安定した操作を行うが可能となる。尚、上記ピンなどは主手摺の水平桟をも貫通しても良い。
【００１０】
また、本発明には、前記主手摺は、前記天板の両方の長辺上に沿って対称に立設されると共に、係る一対の主手摺の少なくとも何れか一方における前記天板の短辺寄りの位置において、前記補助手摺の一端が回転可能に支持されている、折畳式作業台（請求項４）も含まれる。
これによれば、一対の主手摺およびそれらの何れか一端寄りの補助手摺、あるいは一対の主手摺およびそれらの両端寄りの一対の補助手摺により、天板上の作業者に安心感を与えつつ所要の作業を安全に成さしめることが容易となる。
【００１１】
更に、本発明には、複数の前記折畳式作業台は、その天板の長辺を対向して配置され、係る天板間に形成される隙間が当該天板と同じ大きさの補助天板で塞がれると共に、上記折畳式作業台の天板における外側の長辺に沿って一対の前記主手摺が対称に立設され、係る上記一対の主手摺の少なくとも一方には、上記天板の短辺寄りの位置で前記補助手摺の一端が回転可能に支持されている、折畳式作業台（請求項５）も含まれる。
これによれば、建物内の大部屋で天井付近を施工または点検などする際、長辺同士が互いに隣接するよう複数の天板およびこれらの間に補助天板を併設し、上記各天板の外側の長辺に沿って一対の主手摺を立設し、係る一対の主手摺の両端寄りで補助手摺を回転させてほぼ９０度の位置で片持ち状態で停止させることができる。従って、広い作業面積を確保しつつ、複数の天板の長辺側および短辺側の安全も確保することができる。
【００１２】
一方、本発明の折畳式作業台に用いる補助手摺（請求項６）は、平面視が長方形の天板、係る天板の両側の短辺に折畳み可能に取付けた一対の脚部、および、上記天板の少なくとも一方の長辺に沿って立設した主手摺、を含む折畳式作業台に用いられ、上記天板の少なくとも一方の短辺寄りで且つ上記主手摺に一端を回転可能に支持される補助手摺は、上桟、下桟、および係る上・下桟を連結する縦桟を備え、上記上桟は、上記主手摺の手摺桟を内側から横向きに囲む断面コ字形で且つ一対の上・下フランジ間のウェブを切除した両端部を有し、係る両端部の上・下フランジには、上記主手摺の手摺桟と共に貫通する回転用ボルトまたはピンの貫通孔が穿孔されていると共に、上記補助手摺の上桟における両端部に位置する前記ウェブの端面は、当該補助手摺を上記主手摺からほぼ９０度水平回転した際に当該主手摺の手摺桟の側面に当接して補助手摺の上記回転を規制する、ことを特徴とする。
【００１３】
これによれば、前述した請求項１，２の効果に加えて、既設の折畳式作業台に対し後から補助手摺を容易に取付けて、安全性を高めることができる。
尚、本発明には、前記主手摺は、少なくとも前記天板の長辺の両端付近から立設する一対の支柱と、係る一対の支柱の上端間を連結する前記手摺桟と、前記一対の支柱の中間間または下部間を連結する水平桟とを備え、前記補助手摺の下桟における少なくとも一端には、上記主手摺の支柱の側面に固定した金具と共に貫通する下部回転用ボルトまたはピンの貫通孔が穿孔されている、折畳式作業台に用いる補助手摺を含めることも可能である。
【００１４】
尚また、本発明には、前記主手摺は、前記天板の両方の長辺上に沿って対称に立設されると共に、係る一対の主手摺の少なくとも何れか一方における前記天板の短辺寄りの位置において、前記補助手摺の一端が回転可能に支持されている、折畳式作業台に用いる補助手摺を含めることも可能である。
尚更に、本発明には、複数の前記折畳式作業台は、その天板の長辺を対向して配置され、係る天板間に形成される隙間が当該天板と同じ大きさの補助天板で塞がれると共に、上記折畳式作業台の天板における外側の長辺に沿って一対の前記主手摺が対称に立設され、係る上記一対の主手摺の少なくとも一方には、上記天板の短辺寄りの位置で前記補助手摺の一端が回転可能に支持されている、折畳式作業台に用いる補助手摺を含めることも可能である。
【００１５】
【発明の実施の形態】
以下において、本発明の実施に好適な形態を図面と共に説明する。
図１（Ａ），（Ｂ）は本発明の折畳式作業台１の平面図と正面図、図２（Ａ），（Ｂ）は係る作業台１の斜め上方からの視覚による斜視図と右側面図を示す。
折畳式作業台１は、平面視が長方形の天板２と、係る天板２の短辺の両端部に折畳み可能に取付けた一対の脚部１０と、上記天板２の一方の長辺に沿って立設した主手摺２０と、上記天板２の一方の短辺寄りで且つ前記主手摺２０に一端が回転可能に支持される補助手摺３０と、を含むものである。
尚、天板２の長辺とは、図１（Ａ）で水平方向に沿った上下一対の辺を指称し、天板２の短辺とは図１（Ａ）で垂直方向に沿った左右一対の辺を指称する。
図１（Ａ），（Ｂ）および図２（Ａ），（Ｂ）に示すように、天板２は、後述するアルミニウム合金（例えば、ＪＩＳ：Ａ６０６３Ｓ−Ｔ５）からなり断面がほぼ偏平なチャンネル形である３本の押出形材３を両端の端枠８，８などにより並列に固定して形成したものである。各押出形材３の上面には、クレータ形状を呈する多数の滑り止め７，７，…が形成されている。
【００１６】
また、脚部１０は、左右一対でほぼハ字形に配置される一対の脚柱１２と、これらの間を水平に連結する複数の踏み桟１４とからなり、各脚柱１２の上端に固定したブラケット１６を貫通するピン１７を介して、天板２の各短辺ごとの両端部に回転可能に連結されている。また、踏み桟１４と天板２の底面との間には、中間でピン結合したステー１８，１９が連結されている。尚、脚柱１２および踏み桟１４も前記同様のアルミニウム合金の押出形材からなる。
上記ステー１８，１９を互いに重ねるように屈曲させると、図１（Ｂ）中の一点鎖線の矢印で示すように、一対の脚部１０は、回転しつつ天板２の底面付近に重なりつつ折り畳まれる。
尚、一対の脚部１０は、天板２の底面付近に折り畳まれた姿勢で通常保管されており、作業が必要な建物などの現場に搬入された後、図１（Ｂ），図２（Ａ）のように伸長される。また、脚部１０の各脚柱１２は、長手方向に沿って複数の押出形材からなるテレスコープ式に構成し且つ係る方向に伸縮可能としても良い。
【００１７】
図１（Ａ），（Ｂ）および図２（Ａ），（Ｂ）に示すように、主手摺２０は、天板２の一方の長辺に沿って立設され、天板２の長辺の両端付近から立設する一対の支柱２１と、係る支柱２１の上端同士間を連結する手摺桟２６と、一対の支柱２１の中間同士を連結する水平桟２７とを備えている。尚、支柱２１、手摺桟２６、および水平桟２７も、前記同様の押出形材からなり、相互に溶接結合されている。
主手摺２０は、図３（Ａ）に示すように、予め補助手摺３０を一体に取付けた手摺ユニットＴＵとして用意される。係る手摺ユニットＴＵにおける各支柱２１の下端には、図３（Ａ），（Ｂ）に示すように、鋼板のような金属板を曲げ加工したブラケット２２がブラインドリベット（以下、単にリベットとする）２５により固定されている。また、各支柱２１の天板２側に面する側面の下部には、上記ブラケット２２に接近してアングル形の金具２８がリベット２５で固定されている。
【００１８】
図３（Ｂ）に示すように、手摺ユニットＴＵにおける各支柱２１の下端に固定したブラケット２２の先端部２３および水平片２４を、天板２における外側の押出形材３の底面左右の横向き凹溝４に挿入すると共に、各支柱２１に固定した金具２８の水平片２９を上記押出形材３の上面に載置する。この際、金具２８の水平片２９に予め穿設した貫通孔２９ａと押出形材３予め穿設した貫通孔５とを連通させると共に、これらに上方からピンＰを下向きに挿入する。これにより、手摺ユニットＴＵは、各支柱２１、ブラケット２２、金具２８、およびピンＰを介して、天板２の長辺に沿って移動不能にして強固に立設される。
尚、上記ピンＰは、その基端のリングＬに通した図示しないワイヤまたはチェーンを介して、常時隣接する支柱２１から離脱しないように配置しても良い。
【００１９】
図１（Ａ），（Ｂ）、図２（Ａ），（Ｂ）および図３（Ａ）に示すように、補助手摺３０は、前記同様の押出形材からなる上桟３１、下桟４１、およびこれらを中央付近で連結する縦桟４０とからなり、相互に溶接により固定されている。
図４（Ａ）に示すように、上桟３１は、上・下一対の水平なフランジ３２，３４とこれらの間をつなぐ垂直なウェブ３３とからなる断面コ字形で、主手摺２０の手摺桟２６を横向きに囲み得る凹溝３５をほぼ全長に沿って有する。
また、上桟３１の両端部３９，３９は、上記ウェブ３３を所定の長さで切除した切除部３６を有し、係るウェブ３３の端面３７が左右対称に位置すると共に、外周端を左右対称の半円形にした上・下フランジ３２，３４の中心部には、次述する回転用ボルトの貫通孔３８，３８が平面視で同心に穿設されている。
更に、縦桟４０および下桟４１は、角形パイプからなり、下桟４１の両端４３，４３付近には、垂直方向の貫通孔４２，４２が左右対称に穿設されている。
【００２０】
以上のような左右対称の補助手摺３０は、図４（Ｂ），（Ｃ）に示すように、その上桟３１の凹溝３５で主手摺２０の手摺桟２６を囲むように、係る上桟３１と手摺桟２６とを平行に配置し、且つ下桟４１を主手摺２０の水平桟２７上に接近させ且つ平行に配置する。
係る状態で、図４（Ｂ）にて上桟３１の右端側の端部３９における貫通孔３８，３８およびこれに連通する手摺桟２６の貫通孔２６ａに回転用ボルト４４を上方から貫通する。次に、図４（Ｃ）に示すように、上桟３１の右端（一端）３９の上・下フランジ３２，３４および主手摺２０の手摺桟２６を貫通した上記ボルト４４の雄ネジ部４５に袋ナット４６をネジ結合する。
【００２１】
また、図４（Ｂ）に示すように、主手摺２０の水平桟２７に明けた一対の貫通孔２７ａ、スペーサＳ、補助手摺３０の下桟４１の貫通孔４２、および予め主手摺２０の右端側の支柱２１に固定したＬ字形の金具５０の水平片５１に明けた貫通孔５２に対し、回転用ボルト４７を下方から順次貫通する。尚、金具５０は、その垂直片５３をボルト５４・ナット５５により支柱２１に予め固定されている。
次いで、図４（Ｃ）に示すように、主手摺２０の水平桟２７、スペーサＳ、補助手摺３０の下桟４１の右端４３、および上記金具５０の水平片５１を貫通した上記ボルト４７の雄ネジ部４８に対して、ナット４９をネジ結合する。
【００２２】
その結果、前記図３（Ａ）に示したように、補助手摺３０は、主手摺２０の一部として一体化し、手摺ユニットＴＵを形成することができる。尚、補助手摺３０は、主手摺２０における反対側の端部に回転可能に支持することもできる。
尚、図４（Ｄ）に示すように、回転用ボルト４７を補助手摺３０の下桟４１と金具５０における水平片５１の貫通孔５２とに貫通してナット４９と締結しても良い。係る形態は、既存の主手摺２０に補助手摺３０を追加して付設する場合に特に有効である。一方、図４（Ｃ）に示した前記形態は、主手摺２０および補助手摺３０を新たに製造する際に特に有効である。
【００２３】
そして、係る手摺ユニットＴＵを、前記図３（Ｂ）で図示した一対の脚部１０により支持された天板２の長辺に沿って取り付け操作を行うことにより、前記図１（Ａ），（Ｂ）および図２（Ａ），（Ｂ）に示した折畳式作業台１を形成できる。
尚、図４（Ｃ），（Ｄ）のように補助手摺３０の下桟４１を角パイプとし且つ前記金具５０を介して主手摺２０の支柱２１に支持したのは、主手摺２０の組立後に水平桟２７に設ける貫通孔２７ａの位置がドリル自体により支柱２１寄りでは制限される故である。また、手摺桟２６および水平桟２７の貫通孔２６ａ，２７ａは、主手摺２０における反対側の端部にも対称に予め穿設しておいても良い。
【００２４】
次に、折畳式作業台１の使用方法について説明する。
予め、一対の脚部１０を折り畳んだ天板２と、主手摺２０の一部として補助手摺３０が一体化した手摺ユニットＴＵとを、作業すべき現場に搬入する。
先ず、図１（Ｂ）および図２（Ｂ）に示したように、天板２の両側の短辺から一対の脚部１０を対称に伸長する。係る伸長状態は公知のロック機構で固定される。
次いで、係る天板２における一方の長辺に沿って、図３（Ｂ）で示したように、一対のブラケット２２、金具２８、およびピンＰを用いて、手摺ユニットＴＵを立設する。尚、手摺ユニットＴＵが立設される天板２の長辺は、当該現場で転落のおそれがある側、即ち作業の対象でない空間側に面して立設される。
そして、図４（Ｂ），（Ｃ），（Ｄ）で示したように、手摺ユニットＴＵにおける主手摺２０に対して、回転用ボルト４４，４７を回転中心として補助手摺３０を、主手摺２０などのない天板２の長辺側に向けてほぼ９０水平回転させる。具体的には、天板２の上に乗った作業員が、補助手摺３０の上桟３１または縦桟４０を掴んで上記の方向に引き出しつつ水平方向に回転操作を行う。
【００２５】
これにより、図５（Ａ），（Ｂ）に示すように、補助手摺３０は、その上桟３１と下桟４１とにおいて回転用ボルト４４，４７の貫通する端部（一端）３９，４３が主手摺２０側に位置し、且つ反対側の端部（他端）３９，４３が天板２の短辺方向に沿った姿勢となる。即ち、補助手摺３０は、図５（Ａ）中の一点鎖線の矢印で示すように、天板２のうち図示で手前側の長辺に沿って立設する主手摺２０の右端側で当該主手摺２０の手摺桟２６との開き角度θが平面視でほぼ９０度になるまで水平回転する。そして、係る開き角度θがほぼ９０度に達すると、図５（Ｂ）に示すように、補助手摺３０の上桟３１における端部３９側に位置するウェブ３３の端面３７が、主手摺２０の手摺桟２６の側面に当接する。その結果、補助手摺３０は、上記回転を阻止され且つその姿勢のまま片持ち状態となる。
【００２６】
従って、図５（Ａ），（Ｂ）に示すように、本発明の折畳式作業台１によれば、天板２の手前側の長辺に沿って主手摺２０が立設されると共に、係る天板２上に乗った作業員の簡単な操作によって主手摺２０の右端側にほぼ９０度（ほぼ直角）にて位置規制した補助手摺３０を片持ちで配置することができる。即ち、図５（Ａ）において、作業者は左右何れの脚部１０から天板２上に乗っても、補助手摺３０を水平回転させつつ引き出すことにより、天板２の奥行き側の長辺に位置する壁面などに必要な施工、補修、または点検作業を行える。また、作業しながら天板２上を移動した際にも、補助手摺３０により天板２の短辺寄りへの行き過ぎを防いで作業の安全性を図ることができる。しかも、補助手摺３０により関係者以外の者が脚部１０から天板２へ上がって来る事態を予防することも容易となる。
尚、補助手摺３０の主手摺２０への支持位置は、図１（Ａ）および図５（Ａ）で左端側としても良い。この際、補助手摺３０における上桟３１および下桟４１の反対側の端部３９，４３の貫通孔３８，４２に前記ボルト４４などを差し通す。
【００２７】
図６（Ａ）は、前記補助手摺３０の変形形態である補助手摺３０ａを示す。
即ち、補助手摺３０ａは、図６（Ａ）に示すように、前記と同じ上桟３１および下桟４１を有すると共に、これらの間で且つ両端部３９，３９，４３，４３寄り間を前記同様の角形パイプからなる一対の縦残４０ａ，４０ｂを溶接などで連結したものである。係るほぼ四角枠（ロ字）形状を呈する補助手摺３０ａとすることで、全体の強度を高められると共に、作業者の取り扱いも容易となる。
【００２８】
図６（Ｂ）は、前記補助手摺３０および上記補助手摺３０ａの応用形態である補助手摺３０ｂを示す。即ち、補助手摺３０ｂは、図６（Ｂ）に示すように、前記上桟３１と、これと同じ上桟３１からなる下桟４１ａと、これらを上記同様に連結する一対の縦残４０ａ，４０ｂとからなり、これらを溶接などにて連結したものである。下桟４１ａを上桟３１と共通化することにより、前記主手摺２０の手摺桟２６および水平桟２７の双方を横向きに囲んだ状態で、当該補助手摺３０ｂを収納しつつ保管できる。このため、保管時にスペースを取らず且つ安定姿勢にし易くなる。しかも、前記Ｌ字形の金具５０を省略でき、デザイン性も向上する。
【００２９】
図７（Ａ）は、前記折畳式作業台１の応用形態である折畳式作業台１ａの平面図を示す。折畳式作業台１ａは、図７（Ａ）に示すように、前記同様に、天板２の両側の短辺に一対の脚部１０を取り付け、天板２の一方の長辺に沿って図示で手摺桟２６として現れる主手摺２０を立設すると共に、係る主手摺２０の両端付近に一対の補助手摺３０，３０（３０ａ，３０ｂ：以下同様とする）を対称に且つ回転可能にそれぞれ支持している。
前記同様に、天板２上に乗った作業員は、図７（Ａ）中の一点鎖線の矢印で示すように、主手摺２０の両端付近から一対の補助手摺３０，３０を対称に引き出し且つそれぞれ離れるように水平回転させる。その結果、図７（Ａ）中の破線で示すように、一対の補助手摺３０，３０は主手摺２０の両端付近、即ち天板２の両側の短辺寄りに図示で上向き姿勢にして停止する。これによれば、作業者は、主手摺２０のない天板２の長辺側の壁面などに対して、所要の作業を一層安全に行うことが可能となる。尚、補助手摺３０（３０ａ，３０ｂ）は、上・下桟３１，４１の両端部３９，４３が左右対称であるため、方向性のない利点も有する。
【００３０】
図７（Ｂ）は、前記折畳式作業台１の更なる応用形態である折畳式作業台１ｂの平面図を示す。折畳式作業台１ｂは、図７（Ｂ）に示すように、前記同様に天板２の両側の短辺に一対の脚部１０を折畳み可能に取り付け、天板２の両方の長辺に沿って図示で手摺桟２６として現れる主手摺２０，２０を平行にそれぞれ立設すると共に、図示で下側の主手摺２０の両端付近に一対の補助手摺３０，３０を対称に且つ回転可能にそれぞれ支持している。
また、図７（Ｃ）は、上記と同様な応用形態の折畳式作業台１ｂ′の平面図を示す。係る折畳式作業台１ｂ′も、図７（Ｃ）に示すように、前記同様に天板２の両側の短辺に一対の脚部１０を折畳み可能に取り付け、天板２の両方の長辺に沿って図示で手摺桟２６として現れる主手摺２０，２０を平行にそれぞれ立設すると共に、各主手摺２０の一端で且つ対角位置に一対の補助手摺３０，３０を点対称にして回転可能にそれぞれ支持している。
【００３１】
図７（Ｂ），（Ｃ）中の一点鎖線の矢印にて示すように、左右対称の補助手摺３０（３０ａ，３０ｂ）は、折畳式作業台１ｂ，１ｂ′が使用される現場、例えば天井付近の施工作業を行う部屋で作業状況などに応じて一対の主手摺２０のうちで任意の端部付近から引き出して水平回転させられ、且つ相手方の主手摺２０の手摺桟２６に重複または接近させることができる。従って、天板２上における作業者の安全を一層図ることが可能となる。
尚、図７（Ｃ）に示す形態では、主手摺２０および補助手摺３０からなる一対の手摺ユニットＴＵは、互いに同じ構造のものが利用できる。
【００３２】
図８（Ａ）は、前記折畳式作業台１ａを２台用いた応用形態の平面図である。
２台の折畳式作業台１ａ，１ａは、図８（Ａ）に示すように、それらの天板２，２を長辺同士を互いに平行で且つ対向して配置され、これらの隙間は天板２のみからなる補助天板２ａが両作業台１ａの図示しない受け金具間に架け渡されて塞がれる。このため、図８（Ａ）に示すように、天板２，２および補助天板２ａの３枚が、それらの短辺を直線にして並列し、平面視で長方形の広い面積の作業スペースが形成されている。そして、天板２，２における外側の長辺に沿って、手摺桟２６で図示される一対の主手摺２０，２０が互いに対称にそれぞれ立設されると共に、これら一対の主手摺２０の上記天板２の両側の短辺寄りの位置で、一対の補助手摺３０，３０の一端がそれぞれ回転可能に個別に支持されている。
【００３３】
図８（Ａ）中の一点鎖線の矢印で示すように、左右対称の補助手摺３０（３０ａ，３０ｂ）を主手摺２０からほぼ９０度水平回転させ、図中の破線の位置で片持ち状態で停止させる。この結果、天板２，２および補助天板２ａの３枚により形成される広い作業スペースの周囲のうち、補助天板２ａの真上付近を除いて一対の主手摺２０および４組の補助手摺３０により、当該作業スペースに入った作業者を囲むことができる。従って、天井付近の作業を安全且つ迅速に行えると共に、関係者以外の者が不用意に脚部１０を登る事態を予防することも容易となる。
尚、補助手摺３０は、４組が必須ではなく、現場の状況に応じて適宜１組〜３組を必要な位置にのみに支持することもできる。
【００３４】
図８（Ｂ）は、前記折畳式作業台１を２台用いた異なる応用形態の平面図である。２台の折畳式作業台１，１は、図８（Ｂ）に示すように、それらの天板２，２を短辺同士を互いに対向させ且つ離隔した配置され、これらの間に天板２のみからなる補助天板２ａが、各作業台１，１の図示しない受け金具間に架け渡される。即ち、図８（Ｂ）に示すように、天板２，２と補助天板２ａの３枚が、各々の長辺を直線として直列となり、平面視で長方形の細長い作業スペースが形成される。
係る天板２，２ａ，２には、図８（Ｂ）で下側の長辺に沿って手摺桟２６により図示される３組の主手摺２０が個別に且つ直線状に立設されている。そして、両端の天板２，２の主手摺２０のうちで且つ上記細長い作業スペースの両端付近にのみ、補助手摺３０（３０ａ，３０ｂ）の一端を回転可能に支持している。
【００３５】
図８（Ｂ）中の一点鎖線の矢印で示すように、２組の補助手摺３０を主手摺２０からほぼ９０度水平回転させ、図中の破線の位置で片持ち状態で停止させる。
その結果、天板２，２および補助天板２ａの３枚により形成される細長い作業スペースのうち、図８（Ｂ）で上側となる作業対象空間を除いた３辺の周辺を、３組の主手摺２０および２組の補助手摺３０によって囲むことができる。従って、外壁や内壁などに沿った作業を安全且つ迅速に行うが可能となる。
尚、図８（Ｂ）において、補助手摺３０を補助天板２ａから立設する主手摺２０の少なくとも何れか一端寄りに更に取り付けても良い。また、前記折畳式作業台１ｂを２台用い、それらの天板２，２を短辺同士を互いに対向させ且つ離隔した配置され、これらの間に天板２のみからなり且つ両側の長辺に沿って一対の主手摺２０を立設した補助天板２ａを直線状に架け渡しても良い。
【００３６】
本発明は、以上において説明した各形態に限定されるものではない。
例えば、前記脚部１０における一対の脚柱１２，１２は、その下端（先端）に公知のロック機構付きキャスタ、または天板２の短辺と平行な方向に進退するアウトリガ、あるいは摩擦抵抗の大きな滑り止め材を取り付けた形態としても良い。
また、脚部１０における一対の脚柱１２，１２のうち、少なくとも一方の上端付近には、回転式で且つ直立可能な手かがり棒を取り付けても良い。
更に、前記回転用ボルト４４，４７に替え、同様な外径のピンにしても良い。また、前記天板２、脚部１０、主手摺２０、および補助手摺３０における少なくとも一部の構成材を、鋼材または鋼板の曲げ加工材や鋼管としても良い。
尚、本発明は、その趣旨を逸脱しない範囲で種々に変更可能である。
【図面の簡単な説明】
【図１】（Ａ），（Ｂ）は本発明の折畳式作業台の１形態を示す平面図または正面図。
【図２】（Ａ）は上記折畳式作業台の斜視図、（Ｂ）は図１（Ｂ）の右側面図。
【図３】（Ａ）は補助手摺を含む主手摺の斜視図、（Ｂ）は主手摺の天板への取付け構造を示す部分垂直断面図。
【図４】（Ａ）は補助手摺の斜視図、（Ｂ）は補助手摺と主手摺との納まりを示す斜視図、（Ｃ）は（Ｂ）中において回転用ボルト付近における垂直断面図、（Ｄ）は異なる形態の（Ｃ）と同様な垂直断面図。
【図５】（Ａ），（Ｂ）は補助手摺を回転させた際の図２（Ａ）に相当する斜視図または図２（Ｂ）に相当する右側面図。
【図６】（Ａ），（Ｂ）は異なる形態の補助手摺を示す斜視図。
【図７】（Ａ）〜（Ｃ）は異なる形態の折畳式作業台を示す平面図。
【図８】（Ａ），（Ｂ）上記折畳式作業台を用いた応用形態を示す平面図。
【図９】従来の折畳式作業台を示す斜視図。
【符号の説明】
１，１ａ，１ｂ，１ｂ′……折畳式作業台
２………………………………天板
２ａ……………………………補助天板
１０……………………………脚部
２０……………………………主手摺
２１……………………………支柱
２６……………………………手摺桟
２７……………………………水平桟
３０，３０ａ，３０ｂ………補助手摺
３１……………………………上桟
３２……………………………上フランジ
３３……………………………ウェブ
３４……………………………下フランジ
３６……………………………切除部（切除）
３７……………………………ウェブの端面
３８，４２……………………貫通孔
３９，４３……………………端部／一端／両端部
４０，４０ａ，４０ｂ………縦桟
４１，４１ａ…………………下桟
４４，４７……………………回転用ボルト
５０……………………………Ｌ字形金具（金具）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a foldable work table in which a pair of legs supporting a work top plate is foldable and excellent in safety, and an auxiliary handrail used for the work table.
[0002]
[Prior art]
BACKGROUND ART When constructing an outer wall, an inner wall, or a ceiling of a building, a work table on which a worker works on a work floor is widely used. Further, in order to ensure the safety of workers, there has been proposed a work table in which handrails are respectively provided upright along a long side of a work floor supported between a pair of legs (for example, see Patent Document 1).
As shown in FIG. 9, the work table 60 includes a work floor 62 having a rectangular shape in a plan view, a pair of legs 64 rotatably attached to each short side of the work floor 62 via a bracket (not shown), and A pair of handrails 70 are provided upright along each long side of the work floor 62. As shown in FIG. 9, the leg 64 includes a pair of left and right pillars 65 that form a substantially C-shape, and a plurality of treads 66 fixed horizontally between them. An opening angle of the stay 68 is regulated by a stay 68 for adjusting the opening degree which is bridged between the work floor 62 and the bottom surface.
[0003]
[Patent Document 1]
JP-A-11-336455 (FIGS. 2 to 4)
[0004]
Further, as shown in FIG. 9, the handrail 70 has a pair of pillars 72 whose lower ends are inserted and vertically installed in receiving brackets 69 fixed near the four corners of the work floor 62, and horizontally between the upper ends of the pillars 72. It is composed of a handrail bar 74 to be fixed and a reinforcing bar 73 fixed to the middle of the pair of columns 72.
As shown in FIG. 9, between the two handrail bars 74, 74 of the pair of handrails 70, a pair of opening stoppers 76 are arranged at positions near each short side of the work floor 62. The opening stopper 76 is configured to prevent the pair of handrails 70 from being separated from each other and to open outward, so that the pivoting support 78 and the tip of the plate-shaped body 77 rotatably supported by the handrail bar 74 of one of the handrails 70. And a hook 79 which is hung from the handrail and is engaged with the handrail bar 74 of the other handrail 70.
[0005]
[Problems to be solved by the invention]
By the way, the opening stopper 76 used for the work table 60 prevents the above-mentioned opening and also serves as an auxiliary handrail for a worker riding on the work floor 62 to prevent the pair of handrails 70 from falling near both ends thereof. May also work.
However, the opening stopper 76 requires a pair of handrails 70 along the long side of the work floor 62, and the left and right that one of the handrails 70 is the center of rotation and the hook 79 is locked to the other handrail 70. It is asymmetric and lacks versatility, and tends to become unstable when the handrail 70 is removed from the worktable 60 and stored, and it is difficult to add the handrail 70 to the existing worktable 60 later. There was a defect.
The present invention solves the above-described problems in the prior art, and is easily attached to a handrail standing only on one long side of a worker's top plate, and both short sides of the top plate. To provide a foldable workbench including a main handrail and an auxiliary handrail in consideration of worker's safety, such as being able to be stably stored by being compactly housed, and an auxiliary handrail used for the same. Make it an issue.
[0006]
Means for Solving the Problems and Effects of the Invention
In order to solve the above-described problems, the present invention is based on the idea that an auxiliary handrail that cantileverly rotates and has left and right mounting portions formed symmetrically is attached to a main handrail standing upright along the long side of the top plate. It was made.
That is, the folding work table of the present invention (Claim 1) comprises a top plate having a rectangular shape in a plan view, a pair of legs foldably attached to short sides on both sides of the top plate, A main handrail erected along at least one long side, and an auxiliary handrail near one of the short sides of the top plate and one end of which is rotatably supported by the main handrail, the auxiliary handrail is An upper crosspiece, a lower crosspiece, and a vertical crosspiece connecting the upper and lower crosspieces, wherein the upper crosspiece has a U-shaped cross section and a pair of upper and lower flanges that laterally surround the handrail crosspiece of the main handrail from inside. The upper and lower flanges having both ends where the web between them has been cut off, and through holes for a rotating bolt or a pin penetrating with the handrail bar of the main handrail are drilled in the upper and lower flanges. I do.
[0007]
According to this, even if the main handrail is erected along any long side of the top plate, the auxiliary handrail can be easily rotatably supported at one end or both ends of the main handrail in a cantilever state, and at the time of work The auxiliary handrail is horizontally extended from the main handrail to ensure the safety of the worker, and the auxiliary handrail can be stored in a compact and stable state with the auxiliary handrail overlapped with the main handrail during storage. Therefore, it becomes a foldable work bench excellent in safety and workability.
Aluminum alloy is mainly used for the material of the top plate, legs, main handrail, and auxiliary handrail in order to keep the required weight and lightweight, but the material is not limited to this. In addition, the vertical rail of the auxiliary handrail may be one or two or more, and in the case of one, it becomes a substantially E-shaped form connecting near the center of the upper and lower rails, and in the case of two, the upper and lower It is a substantially rectangular shape that connects the positions near both ends of the bar in parallel. Still further, the rotation bolt is screw-coupled to the nut at the male screw portion at the tip, but the shaft between the bolt head and the male screw portion functions as a pin. Further, the main handrail and the auxiliary handrail may be unit-type handrails that can be integrally attached to and detached from the top plate.
[0008]
Further, according to the present invention, the end faces of the web located at both ends of the upper rail of the auxiliary handrail contact the side surfaces of the main rail handrail bar when the auxiliary handrail is rotated approximately 90 degrees from the main rail. A foldable workbench (claim 2) that contacts and restricts the rotation of the auxiliary handrail is also included.
According to this, when the worker riding on the top plate pulls out the auxiliary handrail from the main handrail toward the near side and rotates horizontally by approximately 90 degrees, the end which is the center of rotation of both ends of the upper rail of the auxiliary handrail The end face of the web of the portion comes into contact with the side surface of the handrail bar of the main handrail, and its rotation is stopped. Alternatively, even when the rotation of the auxiliary handrail is initially smaller than 90 degrees, the end face of the web comes into contact with the side surface of the handrail bar of the main handrail and stops when, for example, the body or arm of the worker hits. Therefore, it is possible to further ensure safety at a position near the short side of the top plate. The lower rail of the auxiliary handrail may have the same U-shaped cross-section as the upper rail, and may have both ends where the web between the upper and lower flanges is cut off.
[0009]
Furthermore, in the present invention, the main handrail includes a pair of pillars that are erected from at least near both ends of a long side of the top plate, the handrail barb that connects upper ends of the pair of pillars, and the pair of pillars. A horizontal bar connecting between the middle portions of the columns or between the lower portions, and at least one end of the lower rail of the auxiliary handrail penetrates with a metal fitting fixed to a side surface of the column of the main handrail. The present invention also includes a foldable workbench (Claim 3) in which through holes are formed.
According to this, the lower rail of the auxiliary handrail passes through a horizontal piece of a metal fitting such as an L-shape fixed to the side surface of the support of the main handrail in one of the through holes provided at both ends thereof, and a rotating bolt or pin passes therethrough. And rotatably supported. Therefore, since the auxiliary handrail is supported at both ends of the upper and lower rails so as to be horizontally rotatable, a stable operation can be performed. The pins and the like may pass through the horizontal rail of the main handrail.
[0010]
Further, in the present invention, the main handrail is erected symmetrically along both long sides of the top plate, and at least one of the pair of main handrails is closer to the short side of the top plate. In the position (1), a folding workbench (claim 4) in which one end of the auxiliary handrail is rotatably supported.
According to this, a pair of main handrails and auxiliary handrails near either one of them, or a pair of main handrails and a pair of auxiliary handrails near both ends thereof, are required while giving a sense of security to the worker on the top plate. It is easy to safely perform the above operation.
[0011]
Further, according to the present invention, the plurality of folding worktables are arranged so that the long sides of the top plate are opposed to each other, and a gap formed between the top plates has the same size as that of the top plate. A pair of the main handrails are symmetrically erected along the outer long side of the top plate of the foldable work table while being closed by the plate, and at least one of the pair of main handrails includes the top handrail. A folding workbench (claim 5), wherein one end of the auxiliary handrail is rotatably supported at a position near the short side of the plate (claim 5).
According to this, when constructing or inspecting the vicinity of the ceiling in a large room in a building, a plurality of top plates and an auxiliary top plate are provided in parallel so that the long sides are adjacent to each other, and A pair of main handrails can be erected along the outer long side, and the auxiliary handrails can be rotated near both ends of the pair of main handrails to stop at about 90 degrees in a cantilevered state. Therefore, the safety on the long side and the short side of the plurality of top plates can be secured while securing a large work area.
[0012]
On the other hand, the auxiliary handrail used in the folding work table of the present invention (claim 6) is a top plate having a rectangular shape in a plan view, a pair of legs foldably attached to short sides on both sides of the top plate, and A main handrail erected along at least one long side of the top plate is used for a foldable work table, and one end of the top plate is rotatable near at least one short side and the main handrail. The supported auxiliary handrail includes an upper rail, a lower rail, and a vertical rail connecting the upper and lower rails, and the upper rail has a U-shaped cross section surrounding the handrail rail of the main railing from the inside in a lateral direction. The upper and lower flanges have both ends obtained by cutting the web between the upper and lower flanges, and the upper and lower flanges of the both ends are provided with through holes for rotating bolts or pins penetrating with the handrail bar of the main handrail. With the end faces of the web located at both ends of the upper rail of the auxiliary handrail , The auxiliary handrail for restricting the rotation of the contact with the auxiliary handrail to the side surface of the handrail bars of the main handrail upon horizontal rotation about 90 degrees from the main handrail, characterized in that.
[0013]
According to this, in addition to the effects of the first and second aspects described above, the auxiliary handrail can be easily attached to the existing folding workbench later, and safety can be improved.
According to the present invention, the main handrail includes a pair of pillars standing upright at least from both ends of a long side of the top plate, the handrail bar connecting between upper ends of the pair of pillars, and the pair of pillars. A horizontal bar connecting the middle and lower portions of the main handrail, and at least one end of the lower rail of the auxiliary handrail is provided with a through hole for a lower rotation bolt or pin that passes through a bracket fixed to a side surface of a column of the main handrail. It is also possible to include an auxiliary handrail used for a folding workbench, which is perforated.
[0014]
Further, in the present invention, the main handrail is symmetrically provided along both long sides of the top plate, and the short side of the top plate in at least one of the pair of main handrails. It is also possible to include an auxiliary handrail used for a folding workbench, in which the one end of the auxiliary handrail is rotatably supported at a position closer to the auxiliary handrail.
Still further, in the present invention, the plurality of foldable worktables are disposed so that long sides of the top plate are opposed to each other, and a gap formed between the top plates has an auxiliary size equal to that of the top plate. While being closed by the top plate, a pair of the main handrails are symmetrically erected along an outer long side of the top plate of the folding work table, and at least one of the pair of main handrails is It is also possible to include an auxiliary handrail used for a folding workbench, in which one end of the auxiliary handrail is rotatably supported at a position near the short side of the top plate.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
1A and 1B are a plan view and a front view of a foldable work table 1 of the present invention, and FIGS. 2A and 2B are perspective views of the work table 1 as viewed from obliquely above. The right side view is shown.
The foldable work table 1 includes a top plate 2 having a rectangular shape in plan view, a pair of legs 10 foldably attached to both ends of the short side of the top plate 2, and one long side of the top plate 2. , And an auxiliary handrail 30 near one short side of the top plate 2 and one end of which is rotatably supported by the main handrail 20.
In addition, the long side of the top 2 refers to a pair of upper and lower sides along the horizontal direction in FIG. 1A, and the short side of the top 2 is the left and right along the vertical direction in FIG. A pair of sides is designated.
As shown in FIGS. 1 (A) and 1 (B) and FIGS. 2 (A) and 2 (B), the top plate 2 is made of an aluminum alloy (for example, JIS: A6063S-T5) which will be described later and has a substantially flat cross section. It is formed by fixing three extruded members 3 in parallel by end frames 8 at both ends. On the upper surface of each extruded member 3, a large number of anti-skids 7, 7, ... having a crater shape are formed.
[0016]
The leg 10 includes a pair of left and right legs 12 arranged in a substantially C-shape, and a plurality of treads 14 that horizontally connect the legs 12, and is fixed to the upper end of each leg 12. It is rotatably connected to both ends of each short side of the top plate 2 via pins 17 penetrating the bracket 16. Further, between the step bar 14 and the bottom surface of the top plate 2, stays 18, 19, which are pin-connected in the middle, are connected. The pillar 12 and the step bar 14 are also made of the same extruded aluminum alloy as described above.
When the stays 18 and 19 are bent so as to overlap each other, the pair of legs 10 is rotated and folded near the bottom surface of the top plate 2 while rotating, as indicated by the dashed line arrow in FIG. It is.
Note that the pair of legs 10 is normally stored in a folded position near the bottom surface of the top plate 2, and after being carried into a site such as a building that requires work, FIGS. It is elongated as in A). Further, each pillar 12 of the leg portion 10 may be formed in a telescopic manner including a plurality of extruded members along the longitudinal direction, and may be expandable and contractable in such a direction.
[0017]
As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the main handrail 20 is erected along one long side of the top plate 2 and the long side of the top plate 2 A pair of columns 21 erected from the vicinity of both ends, a handrail bar 26 connecting between the upper ends of the columns 21, and a horizontal bar 27 connecting the middle of the pair of columns 21. The column 21, the handrail bar 26, and the horizontal bar 27 are also made of the same extruded profile and are welded to each other.
As shown in FIG. 3A, the main handrail 20 is prepared as a handrail unit TU to which an auxiliary handrail 30 is integrally attached in advance. As shown in FIGS. 3A and 3B, a bracket 22 formed by bending a metal plate such as a steel plate is provided at a lower end of each support 21 in the handrail unit TU as a blind rivet (hereinafter simply referred to as a rivet). 25. At the lower part of the side surface of each support 21 facing the top plate 2, an angle-shaped fitting 28 is fixed with a rivet 25 close to the bracket 22.
[0018]
As shown in FIG. 3 (B), the front end 23 and the horizontal piece 24 of the bracket 22 fixed to the lower end of each support 21 in the handrail unit TU are horizontally recessed on the bottom surface of the outer extruded profile 3 on the top plate 2. The horizontal piece 29 of the metal fitting 28 fixed to each column 21 is placed on the upper surface of the extruded member 3 while being inserted into the groove 4. At this time, the through hole 29a previously drilled in the horizontal piece 29 of the metal fitting 28 and the through hole 5 previously drilled in the extruded profile 3 are communicated with each other, and the pin P is inserted downward from above. As a result, the handrail unit TU is immovably moved along the long side of the top plate 2 via the columns 21, the brackets 22, the metal fittings 28, and the pins P, and is firmly erected.
Note that the pin P may be arranged so as not to be detached from the adjacent column 21 at all times via a wire or a chain (not shown) that passes through the ring L at the base end.
[0019]
As shown in FIGS. 1 (A), (B), FIGS. 2 (A), (B) and FIG. 3 (A), the auxiliary handrail 30 is composed of an upper beam 31 and a lower beam 41 made of the same extruded material as described above. And a vertical bar 40 connecting these near the center, and are fixed to each other by welding.
As shown in FIG. 4 (A), the upper rail 31 has a U-shaped cross-section composed of a pair of upper and lower horizontal flanges 32 and 34 and a vertical web 33 connecting between the flanges. It has a recess 35 along its length that can laterally surround 26.
Both ends 39, 39 of the upper rail 31 have cutouts 36 obtained by cutting the web 33 at a predetermined length. The end faces 37 of the web 33 are located symmetrically, and the outer peripheral end is symmetrical. At the center of the semi-circular upper and lower flanges 32, 34, through holes 38, 38 for rotating bolts described below are formed concentrically in plan view.
Further, the vertical rail 40 and the lower rail 41 are formed of rectangular pipes, and vertical through holes 42, 42 are formed symmetrically in the vicinity of both ends 43, 43 of the lower rail 41.
[0020]
As shown in FIGS. 4 (B) and 4 (C), the upper and lower symmetric auxiliary handrails 30 are arranged such that the groove 35 of the upper rail 31 surrounds the handrail bar 26 of the main handrail 20 as shown in FIGS. 31 and the handrail bar 26 are arranged in parallel, and the lower bar 41 is brought close to and parallel to the horizontal bar 27 of the main handrail 20.
In this state, the rotation bolt 44 is passed through the through holes 38 at the right end 39 of the upper rail 31 and the through hole 26a of the handrail bar 26 communicating therewith in FIG. 4B from above. Next, as shown in FIG. 4C, the male screw portion 45 of the bolt 44 penetrating the upper and lower flanges 32 and 34 of the right end (one end) 39 of the upper rail 31 and the handrail bar 26 of the main handrail 20 is formed. The cap nut 46 is screwed.
[0021]
Further, as shown in FIG. 4B, a pair of through holes 27a opened in the horizontal rail 27 of the main handrail 20, the spacer S, the through hole 42 of the lower rail 41 of the auxiliary handrail 30, and the right end of the main handrail 20 in advance. The rotating bolts 47 are sequentially penetrated from below into the through holes 52 formed in the horizontal pieces 51 of the L-shaped bracket 50 fixed to the side column 21. The metal fitting 50 has its vertical piece 53 fixed to the support 21 in advance by bolts 54 and nuts 55.
Then, as shown in FIG. 4 (C), the horizontal bar 27 of the main handrail 20, the spacer S, the right end 43 of the lower rail 41 of the auxiliary handrail 30, and the male of the bolt 47 penetrating the horizontal piece 51 of the metal fitting 50. A nut 49 is screwed to the screw portion 48.
[0022]
As a result, as shown in FIG. 3A, the auxiliary handrail 30 can be integrated as a part of the main handrail 20 to form the handrail unit TU. Note that the auxiliary handrail 30 may be rotatably supported at the opposite end of the main handrail 20.
In addition, as shown in FIG. 4D, the bolt 49 for rotation may be passed through the lower rail 41 of the auxiliary handrail 30 and the through hole 52 of the horizontal piece 51 of the fitting 50 and fastened to the nut 49. Such a form is particularly effective when the auxiliary handrail 30 is additionally provided to the existing main handrail 20. On the other hand, the embodiment shown in FIG. 4C is particularly effective when the main handrail 20 and the auxiliary handrail 30 are newly manufactured.
[0023]
Then, by performing the attaching operation of the handrail unit TU along the long side of the top plate 2 supported by the pair of legs 10 illustrated in FIG. B) and the folding work table 1 shown in FIGS. 2A and 2B can be formed.
As shown in FIGS. 4C and 4D, the lower rail 41 of the auxiliary handrail 30 is formed as a square pipe and supported by the support 21 of the main handrail 20 via the metal fitting 50 after the main handrail 20 is assembled. This is because the position of the through hole 27a provided in the horizontal bar 27 is limited near the support 21 by the drill itself. Further, the through-holes 26 a and 27 a of the handrail bar 26 and the horizontal bar 27 may be formed in advance at the opposite end of the main handrail 20 symmetrically.
[0024]
Next, a method of using the folding work table 1 will be described.
The top plate 2 in which the pair of legs 10 are folded in advance and the handrail unit TU in which the auxiliary handrail 30 is integrated as a part of the main handrail 20 are carried to the work site.
First, as shown in FIGS. 1B and 2B, a pair of legs 10 is symmetrically extended from the short sides on both sides of the top plate 2. Such an extended state is fixed by a known lock mechanism.
Next, as shown in FIG. 3B, a handrail unit TU is erected along one long side of the top plate 2 using a pair of brackets 22, a metal fitting 28, and a pin P. Note that the long side of the top plate 2 on which the handrail unit TU is erected is erected on the side where there is a risk of falling at the site, that is, on the side of the space that is not the target of work.
Then, as shown in FIGS. 4B, 4C, and 4D, the auxiliary handrail 30 and the main handrail 20 are rotated around the rotation bolts 44 and 47 with respect to the main handrail 20 in the handrail unit TU. Is rotated horizontally by about 90 toward the long side of the top plate 2 where there is no such as. Specifically, an operator riding on the top board 2 performs a rotation operation in the horizontal direction while grasping the upper rail 31 or the vertical rail 40 of the auxiliary handrail 30 and pulling out in the above direction.
[0025]
As a result, as shown in FIGS. 5A and 5B, the auxiliary handrail 30 has its upper ends 31 and lower ends 41 through which the ends (one ends) 39 and 43 of the rotation bolts 44 and 47 penetrate. Ends (other ends) 39 and 43 located on the side of the main handrail 20 and on the opposite side are in a posture along the short side direction of the top plate 2. That is, the auxiliary handrail 30 is located on the right end side of the main handrail 20 erected along the long side on the front side of the top plate 2 as shown in FIG. The handrail 20 rotates horizontally until the opening angle θ between the handrail 20 and the handrail bar 26 becomes substantially 90 degrees in plan view. When the opening angle θ reaches approximately 90 degrees, as shown in FIG. 5B, the end face 37 of the web 33 located on the end 39 side of the upper rail 31 of the auxiliary handrail 30 is moved to the main handrail 20. It comes into contact with the side surface of the handrail bar 26. As a result, the auxiliary handrail 30 is prevented from rotating and is in a cantilevered state with the posture.
[0026]
Therefore, as shown in FIGS. 5A and 5B, according to the folding work table 1 of the present invention, the main handrail 20 is erected along the long side of the top plate 2 on the near side. The auxiliary handrail 30 whose position is regulated at approximately 90 degrees (substantially at right angles) can be disposed on the right end side of the main handrail 20 by a simple operation of an operator riding on the top plate 2 in a cantilever manner. That is, in FIG. 5A, even if the worker gets on the top board 2 from either of the left and right legs 10, the worker pulls out the auxiliary handrail 30 while rotating horizontally, so that the auxiliary handrail 30 is extended to the long side on the depth side of the top board 2. Necessary construction, repair, or inspection work can be performed on the located wall. In addition, even when the user moves on the top plate 2 while working, the auxiliary handrails 30 can prevent the top plate 2 from going too far to the short side, thereby improving work safety. In addition, the auxiliary handrail 30 makes it easier to prevent a person other than the person concerned from coming up from the leg 10 to the top 2.
The supporting position of the auxiliary handrail 30 on the main handrail 20 may be on the left end side in FIGS. 1A and 5A. At this time, the bolts 44 and the like are inserted into the through holes 38 and 42 at the ends 39 and 43 of the auxiliary handrail 30 opposite to the upper and lower rails 31 and 41.
[0027]
FIG. 6A shows an auxiliary handrail 30a which is a modification of the auxiliary handrail 30.
That is, as shown in FIG. 6 (A), the auxiliary handrail 30a has the same upper beam 31 and lower beam 41 as described above, and the space between both ends 39, 39, 43, and 43 is similar to the above. Are connected by welding or the like. By providing the auxiliary handrail 30a having such a substantially square frame (b-shape) shape, the overall strength can be increased and the handling of the operator can be facilitated.
[0028]
FIG. 6B shows the auxiliary handrail 30 and an auxiliary handrail 30b which is an application of the auxiliary handrail 30a. That is, as shown in FIG. 6 (B), the auxiliary handrail 30b includes the upper beam 31 and the lower beam 41a formed of the same upper beam 31 and a pair of vertical residues 40a, 40b connecting the same in the same manner as described above. These are connected by welding or the like. By sharing the lower rail 41 a with the upper rail 31, the auxiliary rail 30 b can be stored and stored in a state in which both the rail 26 and the horizontal rail 27 of the main rail 20 are laterally surrounded. For this reason, a space is not taken up at the time of storage, and it becomes easy to make it a stable posture. In addition, the L-shaped fitting 50 can be omitted, and the design is improved.
[0029]
FIG. 7A is a plan view of a foldable work table 1 a which is an application of the foldable work table 1. As shown in FIG. 7A, the foldable work table 1a has a pair of legs 10 attached to the short sides on both sides of the top plate 2 as described above, and extends along one long side of the top plate 2. A main handrail 20, which appears as a handrail bar 26 in the figure, is erected, and a pair of auxiliary handrails 30, 30 (30a, 30b: the same applies hereinafter) are supported symmetrically and rotatably near both ends of the main handrail 20. are doing.
In the same manner as described above, the worker riding on the top plate 2 symmetrically pulls out a pair of auxiliary handrails 30 and 30 from near both ends of the main handrail 20, as indicated by the dashed-dotted arrows in FIG. Rotate horizontally to separate them. As a result, as shown by a broken line in FIG. 7A, the pair of auxiliary handrails 30, 30 is stopped near the both ends of the main handrail 20, that is, near the short sides on both sides of the top plate 2, as illustrated. . According to this, the worker can perform required work more safely on the wall surface on the long side of the top plate 2 without the main handrail 20. In addition, the auxiliary handrail 30 (30a, 30b) also has the advantage of having no direction since the both end portions 39, 43 of the upper and lower rails 31, 41 are symmetrical.
[0030]
FIG. 7B is a plan view of a foldable worktable 1b which is a further applied form of the foldable worktable 1. As shown in FIG. 7 (B), the folding workbench 1b has a pair of legs 10 foldably attached to the short sides on both sides of the top plate 2 as described above, and is attached to both long sides of the top plate 2. The main handrails 20, 20 appearing as handrails 26 in the drawing are erected in parallel with each other, and a pair of auxiliary handrails 30, 30 are symmetrically and rotatably provided near both ends of the lower main handrail 20 in the drawing. I support it.
FIG. 7C is a plan view of a foldable work table 1b 'having the same application as the above. As shown in FIG. 7 (C), the foldable worktable 1b 'also has a pair of legs 10 foldably attached to the short sides on both sides of the top plate 2, as shown in FIG. The main handrails 20, which appear as handrail bars 26 in the figure are erected in parallel along the sides, and the pair of auxiliary handrails 30, 30 are rotated at one end of each main handrail 20 and at diagonal positions with point symmetry. Support each as possible.
[0031]
As shown by the dashed-dotted arrows in FIGS. 7B and 7C, the symmetrical auxiliary handrail 30 (30a, 30b) is used at the site where the folding work tables 1b, 1b 'are used, for example, In a room near the ceiling where work is performed, depending on the work situation, a pair of main handrails 20 can be pulled out from near any end and horizontally rotated, and overlap or approach the handrail bar 26 of the other main handrail 20 Can be done. Therefore, the safety of the worker on the top plate 2 can be further improved.
In the embodiment shown in FIG. 7C, a pair of handrail units TU including the main handrail 20 and the auxiliary handrail 30 can have the same structure.
[0032]
FIG. 8A is a plan view of an application using two folding work tables 1a.
As shown in FIG. 8 (A), the two foldable work tables 1a, 1a are arranged with their top plates 2, 2 in parallel with their long sides facing each other and facing each other. An auxiliary top plate 2a composed of only the plate 2 is bridged between receiving brackets (not shown) of both worktables 1a and closed. For this reason, as shown in FIG. 8A, three top plates 2 and 2 and auxiliary top plate 2a are arranged side by side with their short sides being straight lines, and a work space having a rectangular large area in plan view is obtained. Is formed. A pair of main handrails 20, 20 illustrated by handrails 26 are erected symmetrically with each other along the outer long side of the top plates 2, 2. One end of each of the pair of auxiliary handrails 30 is individually supported rotatably at a position near the short side on both sides of the plate 2.
[0033]
As shown by the one-dot chain line arrow in FIG. 8A, the symmetrical auxiliary handrail 30 (30a, 30b) is horizontally rotated approximately 90 degrees from the main handrail 20, and is held in a cantilevered state at the position indicated by the broken line in the figure. Stop. As a result, a pair of main handrails 20 and four sets of auxiliary handrails are provided around the wide work space formed by the three top plates 2 and 2 and the auxiliary top plate 2a except for the area immediately above the auxiliary top plate 2a. 30 allows the worker entering the work space to be surrounded. Therefore, work near the ceiling can be performed safely and quickly, and it is also easy to prevent a situation in which a person other than the concerned person climbs the leg 10 carelessly.
Incidentally, four sets of auxiliary handrails 30 are not indispensable, and one to three sets can be appropriately supported only at necessary positions according to the situation at the site.
[0034]
FIG. 8B is a plan view of a different application mode using two folding work tables 1. As shown in FIG. 8B, the two foldable worktables 1 and 1 are arranged such that their short sides are opposed to each other and their top plates 2 and 2 are spaced apart from each other. An auxiliary top plate 2a consisting only of the work tables 2 is bridged between receiving brackets (not shown) of the work tables 1 and 1. That is, as shown in FIG. 8B, the three top plates 2 and 2 and the auxiliary top plate 2a are connected in series with each long side being a straight line, and a rectangular elongated work space is formed in plan view.
On the top plates 2, 2a and 2, three sets of main handrails 20 illustrated by handrails 26 along the lower long side in FIG. 8B are individually and linearly erected. . One end of the auxiliary handrail 30 (30a, 30b) is rotatably supported only in the main handrails 20 of the top plates 2 at both ends and near both ends of the elongated work space.
[0035]
As shown by the dashed line arrow in FIG. 8B, the two sets of auxiliary handrails 30 are horizontally rotated by approximately 90 degrees from the main handrail 20 and stopped in a cantilevered state at the position indicated by the broken line in the figure.
As a result, of the long and narrow work space formed by the three top plates 2 and 2 and the auxiliary top plate 2a, three sets of the periphery of the three sides excluding the upper work space in FIG. It can be surrounded by a main handrail 20 and two sets of auxiliary handrails 30. Therefore, work along the outer wall, the inner wall, and the like can be performed safely and quickly.
In FIG. 8B, the auxiliary handrail 30 may be further attached to at least one end of the main handrail 20 erected from the auxiliary top plate 2a. In addition, two folding work tables 1b are used, and the top plates 2 and 2 are arranged with their short sides facing each other and spaced apart from each other. The auxiliary top plate 2a on which a pair of main handrails 20 are erected may be stretched in a straight line.
[0036]
The present invention is not limited to the embodiments described above.
For example, a pair of pillars 12, 12 in the leg portion 10 may have casters with a lock mechanism at their lower ends (tips), outriggers that advance and retreat in a direction parallel to the short side of the top plate 2, or a large frictional resistance. It is good also as a form to which the non-slip material was attached.
In addition, a rotatable and upright ligature bar may be attached to at least the vicinity of the upper end of at least one of the pair of pillars 12 in the leg portion 10.
Further, instead of the rotation bolts 44 and 47, pins having the same outer diameter may be used. In addition, at least a part of the components of the top plate 2, the leg 10, the main handrail 20, and the auxiliary handrail 30 may be a bent material or a steel pipe of a steel material or a steel plate.
Note that the present invention can be variously modified without departing from the spirit thereof.
[Brief description of the drawings]
FIGS. 1A and 1B are a plan view and a front view showing one embodiment of a folding workbench according to the present invention.
2A is a perspective view of the folding work table, and FIG. 2B is a right side view of FIG. 1B.
3A is a perspective view of a main handrail including an auxiliary handrail, and FIG. 3B is a partial vertical cross-sectional view showing a structure of attaching the main handrail to a top plate.
FIG. 4A is a perspective view of an auxiliary handrail, FIG. 4B is a perspective view showing an accommodation of the auxiliary handrail and a main handrail, FIG. 4C is a vertical cross-sectional view in the vicinity of a rotation bolt in FIG. D) is a vertical sectional view similar to (C) in a different form.
FIGS. 5A and 5B are perspective views corresponding to FIG. 2A or right side views corresponding to FIG. 2B when the auxiliary handrail is rotated.
FIGS. 6A and 6B are perspective views showing different types of auxiliary handrails.
FIGS. 7A to 7C are plan views showing different types of folding work platforms.
FIGS. 8A and 8B are plan views showing application forms using the folding workbench.
FIG. 9 is a perspective view showing a conventional folding work table.
[Explanation of symbols]
1, 1a, 1b, 1b '... folding workbench
2 ......... top board
2a ............ Auxiliary top plate
10 Legs
20 .............. Main handrail
21 ……………………… post
26 …………………… Handrail
27 …………………… Horizontal bar
30, 30a, 30b …… Auxiliary handrail
31 ………………………
32 ………………………… upper flange
33 ……………………… Web
34 …………………………… Lower flange
36 .............. Resection (resection)
37 .................... End face of web
38, 42 ...... Through-hole
39, 43 .................. End / One end / Both ends
40, 40a, 40b ... vertical rail
41, 41a …………………
44, 47 ……………… Rotating bolt
50 L-shaped bracket (bracket)

Claims

A top plate having a rectangular shape in plan view, a pair of legs foldably attached to short sides on both sides of the top plate, a main handrail standing upright along at least one long side of the top plate, An auxiliary handrail near one of the short sides of the plate and one end of which is rotatably supported by the main handrail,
The auxiliary handrail includes an upper rail, a lower rail, and a vertical rail connecting the upper and lower rails,
The upper rail has a U-shaped cross section surrounding the handrail bar of the main railing sideways from inside and has both ends obtained by cutting a web between a pair of upper and lower flanges. And a through hole for a rotation bolt or pin penetrating with the handrail bar of the main handrail.

The end faces of the web located at both ends of the upper rail of the auxiliary handrail abut on the side surfaces of the rail of the main handrail when the auxiliary handrail is horizontally rotated by approximately 90 degrees from the main handrail. Regulating rotation,
The foldable work table according to claim 1, wherein:

The main handrail is at least a pair of pillars erected from near both ends of the long side of the top plate, the handrail bar connecting between upper ends of the pair of pillars, and a middle or lower part of the pair of pillars. With a horizontal bar connecting between each other,
2. A through hole for a lower rotation bolt or pin, which penetrates at least one end of the lower rail of the auxiliary handrail and a bracket fixed to a side surface of a column of the main handrail, is provided. 3. The folding workbench according to 2.

The main handrail is erected symmetrically along both long sides of the top plate, and the auxiliary handrail is located at a position near the short side of the top plate in at least one of the pair of main handrails. One end is rotatably supported,
The folding workbench according to any one of claims 1 to 3, wherein:

A plurality of the foldable worktables are arranged with the long sides of the top plate facing each other, and a gap formed between the top plates is closed by an auxiliary top plate having the same size as the top plate,
A pair of the main handrails are erected symmetrically along an outer long side of the top plate of the folding workbench, and at least one of the pair of main handrails is located at a position closer to the short side of the top plate. One end of the auxiliary handrail is rotatably supported,
The folding workbench according to any one of claims 1 to 4, wherein:

A fold including a top plate having a rectangular plan view, a pair of legs foldably attached to short sides on both sides of the top plate, and a main handrail standing upright along at least one long side of the top plate. Used for tatami-type work platforms,
The auxiliary handrail, which is rotatably supported at one end near the short side of the top plate and one end of the main handrail rotatably, includes an upper rail, a lower rail, and a vertical rail connecting the upper and lower rails,
The upper rail has a U-shaped cross section surrounding the handrail bar of the main railing sideways from inside and has both ends obtained by cutting a web between a pair of upper and lower flanges. A through-hole for a rotating bolt or pin that penetrates with the handrail bar of the main handrail is drilled,
The end faces of the web located at both ends of the upper rail of the auxiliary handrail abut the side surfaces of the rail of the main handrail when the auxiliary handrail is horizontally rotated by approximately 90 degrees from the main handrail. Regulating rotation,
An auxiliary handrail for use in a folding workbench.