JP4043972B2

JP4043972B2 - Folding work table and auxiliary handrail used therefor

Info

Publication number: JP4043972B2
Application number: JP2003050185A
Authority: JP
Inventors: 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: 2008-02-06
Anticipated expiration: 2023-02-27
Also published as: JP2004257146A

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]
BACKGROUND OF THE INVENTION
The present invention relates to a foldable workbench in which a pair of legs supporting a work top plate is foldable and excellent in safety, and an auxiliary handrail used therefor.
[0002]
[Prior art]
When constructing an outer wall, an inner wall, or a ceiling of a building, a work table is widely used for an operator to work on a work floor. In addition, for the safety of workers, there has been proposed a work table in which handrails are erected along the long sides of a work floor supported between a pair of legs (see, for example, Patent Document 1).
As shown in FIG. 9, the work table 60 has a rectangular work floor 62 in plan view, a pair of legs 64 rotatably attached to each short side of the work floor 62 via a bracket (not shown), and the above A pair of handrails 70 erected along the long sides of the work floor 62 are provided. As shown in FIG. 9, the leg body 64 is composed of a pair of left and right leg pillars 65 that form a substantially C shape, and a plurality of step bars 66 that are horizontally fixed between them. The opening angle is regulated by a stay 68 for adjusting the opening degree spanned between the bottom surface of the work floor 62.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-336455 (FIGS. 2 to 4)
[0004]
Further, as shown in FIG. 9, the handrail 70 is horizontally disposed between a pair of support pillars 72 that are suspended by inserting a lower end into a receiving metal fitting 69 fixed near the four corners of the work floor 62, and between the upper ends of the support pillars 72. It consists of a handrail bar 74 that is fixed and a reinforcing bar 73 that is fixed between 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 locking clasps 76 are arranged at positions near the short sides of the work floor 62. In order to prevent the pair of handrails 70 from being separated from each other and opening to the outside, the opening stoppers 76 are pivotally supported by the handrail bar 74 of one handrail 70 and the tip of the plate-shaped main body 77. And a hook 79 which is suspended from the handrail 70 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 metal fitting 76 used for the work table 60 prevents the above-described opening and serves as an auxiliary handrail for preventing a fall in the vicinity of both ends of the pair of handrails 70 and 70 for the worker on the work floor 62. Can also work.
However, the anti-opening metal fitting 76 requires a pair of handrails 70 along the long side of the work floor 62, and the right and left that one handrail 70 is the center of rotation and the hook 79 is locked to the other handrail 70. It is asymmetrical and lacks versatility, tends to be unstable when the handrail 70 is removed from the workbench 60 and stored, and is difficult to add to the handrail 70 of the existing workbench 60 later. There was a bug.
The present invention solves the problems in the prior art described above, is easily attached to a handrail standing only on one long side of the top plate for the operator, and both short sides of the top plate To provide a foldable workbench including a main handrail and an auxiliary handrail that considers the safety of the operator, and an auxiliary handrail used therefor, such as being attached to both left and right, and being compactly stored and stably stored Let it be an issue.
[0006]
[Means for Solving the Problems and Effects of the Invention]
In order to solve the above-mentioned problem, the present invention is conceived to attach an auxiliary handrail that is cantilevered and that has left and right attachment portions formed symmetrically to a main handrail that stands up along the long side of the top plate. It was made.
That is, the foldable workbench (Claim 1) of the present invention includes a top plate that is rectangular in plan view, a pair of legs that are foldably attached to the short sides on both sides of the top plate, and the top plate. A main handrail erected along at least one long side, and an auxiliary handrail that is near at least one short side of the top plate and has one end rotatably supported by the main handrail, the auxiliary handrail, An upper rail, a lower rail, and a vertical rail that connects the upper and lower rails, the upper rail having a U-shaped cross section surrounding the handrail rail of the main handrail laterally from the inside, and a pair of upper and lower flanges It has both end portions where the web is cut between, and the upper and lower flanges of both end portions are perforated with through holes for rotating bolts or pins that penetrate with the handrail bars of the main handrail. To 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 supported in a cantilevered state at one or both ends of the main handrail. The auxiliary handrail extends horizontally from the main handrail to ensure the safety of the operator, and can be stored in a compact and stable state with the auxiliary handrail superimposed on the main handrail during storage. Therefore, the folding work table is excellent in safety and workability.
The top plate, the legs, the main handrail, and the auxiliary handrail are mainly made of an aluminum alloy in order to reduce the weight and maintain the required strength, but are not limited thereto. In addition, the vertical rail of the auxiliary handrail may be one or two or more. In the case of one, the upper and lower rails are connected to each other near the center, and in the case of two, the upper and lower rails are connected. It becomes the shape of a substantially square shape which connects the position near the both ends of a crosspiece in parallel. Still further, the rotating bolt is screw-coupled to the nut at the front male screw portion, but the shaft portion between the bolt head and the male screw portion functions as a pin. In addition, the main handrail and the auxiliary handrail may be unit-type handrails that can be attached to and detached from the top plate integrally.
[0008]
Further, according to the present invention, the end surfaces of the webs positioned at both ends of the upper rail of the auxiliary handrail contact the side surface of the handrail of the main handrail when the auxiliary handrail is horizontally rotated by approximately 90 degrees from the main handrail. Also included is a foldable workbench (claim 2) that contacts and regulates the rotation of the auxiliary handrail.
According to this, when an operator who rides on the top plate horizontally rotates approximately 90 degrees while pulling the auxiliary handrail from the main handrail toward the front side, the end of the upper rail of the auxiliary handrail becomes the center of rotation. The end surface of the web of the part contacts the side surface of the handrail bar of the main handrail, and the rotation is stopped. Alternatively, even if the rotation of the auxiliary handrail is initially smaller than 90 degrees, for example, when the worker's body or arm hits, the end surface of the web comes into contact with the side surface of the handrail rail of the main handrail and stops. Therefore, the safety at the position near the short side of the top plate can be further ensured. The lower rail of the auxiliary handrail may have a U-shaped cross section similar to that of the upper rail and have both end portions obtained by cutting the web between the upper and lower flanges.
[0009]
Further, according to the present invention, the main handrail includes at least a pair of support columns erected from the vicinity of both ends of the long side of the top plate, the handrail bar connecting between the upper ends of the pair of support columns, A lower rail that connects between the middles of the columns or between the lowers, and at least one end of the lower rail of the auxiliary handrail, and a lower rotation bolt or pin that penetrates with a metal fitting fixed to the side surface of the column of the main rail A foldable work table (Claim 3) is also included.
According to this, the lower rail of the auxiliary handrail is penetrated by a rotating bolt or pin that penetrates a horizontal piece of an L-shaped metal fitting fixed to the side surface of the main handrail post in either of the through holes provided at both ends thereof. And is rotatably supported. Therefore, since the auxiliary handrail is supported so as to be horizontally rotatable at both ends of the upper and lower rails, a stable operation can be performed. The pin or the like may penetrate the horizontal rail of the main handrail.
[0010]
Further, according to the present invention, the main handrail is erected symmetrically along both long sides of the top plate, and near the short side of the top plate in at least one of the pair of main handrails. In this position, a folding work table (Claim 4) in which one end of the auxiliary handrail is rotatably supported is also included.
According to this, a pair of main handrails and an auxiliary handrail near either one of them, or a pair of main handrails and a pair of auxiliary handrails near both ends, while giving a sense of security to the operator on the top plate It is easy to perform the above work safely.
[0011]
Further, according to the present invention, the plurality of folding work tables are arranged so that the long sides of the top plates are opposed to each other, and a gap formed between the top plates is the same size as the top plate. A pair of the main handrails are erected symmetrically along the outer long side of the top plate of the folding work table, and at least one of the pair of main handrails A folding work table (Claim 5) is also included in which one end of the auxiliary handrail is rotatably supported at a position near the short side of the plate.
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 auxiliary top plates are provided between them so that the long sides are adjacent to each other. A pair of main handrails can be erected along the outer long side, and the auxiliary handrail can be rotated near both ends of the pair of main handrails and stopped in a cantilever state at a position of approximately 90 degrees. Accordingly, it is possible to ensure safety on the long side and short side of the plurality of top plates while ensuring a wide work area.
[0012]
On the other hand, an auxiliary handrail used in the folding work table of the present invention (Claim 6) has a rectangular top plate in a plan view, a pair of legs attached so as to be foldable on both short sides of the top plate, and Used in a folding workbench including a main handrail standing along at least one long side of the top plate, and at least one short side of the top plate and being rotatable at one end to the main handrail The auxiliary rail supported is provided with an upper rail, a lower rail, and a vertical rail that connects the upper and lower rails, and the upper rail has a U-shaped cross-section that surrounds the main rail rail horizontally from the inside. Both ends of the web between the upper and lower flanges are cut off, and the upper and lower flanges of both ends are perforated with through holes for rotating bolts or pins that penetrate with the handrail bar of the main handrail. In addition, the end face of the web located at both ends of the upper rail of the auxiliary handrail is The side surface of the handrail bars of the main handrail abuts to restrict the rotation of the auxiliary handrail when rotated approximately 90 degrees horizontally the auxiliary handrail 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 work table later, and the safety can be improved.
In the present invention, the main handrail includes at least a pair of support columns standing from both ends of the long side of the top plate, the handrail bar connecting between the upper ends of the pair of support columns, and the pair of support columns. A horizontal rail that connects between the middle or lower portions of the auxiliary handrail, at least one end of the lower rail of the auxiliary handrail, and a through hole for a lower rotating bolt or pin that penetrates together with a metal fitting fixed to a side surface of the main handrail post. It is also possible to include an auxiliary handrail for use in a foldable workbench in which is perforated.
[0014]
Further, in the present invention, the main handrail is erected symmetrically 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 foldable workbench in which one end of the auxiliary handrail is rotatably supported at a position close to it.
Still 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 the gap formed between the top plates is the same size as the top plate. A pair of the main handrails are erected symmetrically along the outer long side of the top plate of the foldable workbench, and the pair of main handrails are attached to 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 one end of the auxiliary handrail is rotatably supported at a position near the short side of the top plate.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the following, preferred embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are a plan view and a front view of a foldable workbench 1 according to the present invention, and FIGS. 2A and 2B are perspective views of the workbench 1 viewed from obliquely above. A right side view is shown.
The foldable work table 1 includes a top plate 2 that is rectangular in plan view, a pair of legs 10 that are 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 that is close to one short side of the top plate 2 and has one end rotatably supported by the main handrail 20.
The long side of the top plate 2 refers to a pair of upper and lower sides along the horizontal direction in FIG. 1 (A), and the short side of the top plate 2 refers to the left and right sides along the vertical direction in FIG. 1 (A). A pair of sides is designated.
As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the top plate 2 is a channel made of an aluminum alloy (for example, JIS: A6063S-T5) described later and having a substantially flat cross section. The three extruded shapes 3 having a shape are formed by being fixed in parallel by end frames 8 and 8 at both ends. .. Are formed on the upper surface of each extruded shape member 3.
[0016]
The leg portion 10 includes a pair of left and right leg columns 12 arranged in a substantially C shape, and a plurality of step bars 14 that are horizontally connected therebetween, and is fixed to the upper end of each leg column 12. Via pins 17 that penetrate the bracket 16, the top plate 2 is rotatably connected to both ends of each short side. Further, between the step bar 14 and the bottom surface of the top plate 2, stays 18 and 19 that are pin-coupled in the middle are connected. In addition, the pedestal 12 and the tread bar 14 are also made of an extruded shape of the same aluminum alloy as described above.
When the stays 18 and 19 are bent so as to overlap each other, the pair of leg portions 10 are folded while being overlapped with the vicinity of the bottom surface of the top plate 2 while rotating, as indicated by an alternate long and short dash line arrow in FIG. It is.
The pair of legs 10 is normally stored in a position folded near the bottom surface of the top board 2, and after being carried into a site such as a building that requires work, FIG. 1 (B), FIG. Elongated as in A). Moreover, each pedestal 12 of the leg part 10 is good also as being comprised in the telescope type which consists of a some extrusion shape member along a longitudinal direction, and being able to expand-contract in the said 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 support columns 21 erected from the vicinity of both ends thereof, a handrail beam 26 that connects the upper ends of the support columns 21, and a horizontal beam 27 that connects the middle of the pair of support columns 21. In addition, the support | pillar 21, the handrail crossing 26, and the horizontal crossing 27 consist of the same extruded shape material as the above, and are welded together. As shown in FIG. 3A, the main handrail 20 is prepared as a handrail unit TU to which the 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 a blind rivet (hereinafter simply referred to as a rivet) at the lower end of each column 21 in the handrail unit TU. 25 is fixed. In addition, an angle-shaped metal fitting 28 is fixed by a rivet 25 at the lower part of the side surface facing the top plate 2 side of each column 21 so as to approach the bracket 22.
[0018]
As shown in FIG. 3 (B), the front end portion 23 and the horizontal piece 24 of the bracket 22 fixed to the lower end of each column 21 in the handrail unit TU are horizontally recessed on the left and right sides of the bottom of the extruded member 3 on the top plate 2. The horizontal piece 29 of the metal fitting 28 that is inserted into the groove 4 and fixed to each column 21 is placed on the upper surface of the extruded shape member 3. 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 are communicated, and the pin P is inserted downward from above. As a result, the handrail unit TU is firmly erected so as to be immovable along the long side of the top plate 2 via the support columns 21, the brackets 22, the metal fittings 28, and the pins P.
The pin P may be arranged so as not to be separated from the adjacent column 21 through a wire or chain (not shown) that is passed through the base ring L.
[0019]
As shown in FIGS. 1 (A), 1 (B), 2 (A), 2 (B) and 3 (A), the auxiliary handrail 30 is composed of an upper beam 31 and a lower beam 41 made of the same extruded shape as described above. , And a vertical beam 40 connecting them in the vicinity of the center, and are fixed to each other by welding.
As shown in FIG. 4A, the upper rail 31 has a U-shaped cross section comprising a pair of upper and lower horizontal flanges 32 and 34 and a vertical web 33 connecting the upper and lower horizontal flanges 32 and 34. It has a concave groove 35 that can surround 26 in a lateral direction substantially along its entire length.
Further, both end portions 39, 39 of the upper bar 31 have a cut portion 36 obtained by cutting the web 33 with a predetermined length, and the end surface 37 of the web 33 is positioned symmetrically and the outer peripheral end is symmetrical. The through-holes 38 and 38 of the rotation bolt described below are formed concentrically in a plan view at the center of the upper and lower flanges 32 and 34 having a semicircular shape.
Further, the vertical rail 40 and the lower rail 41 are formed of square pipes, and vertical through holes 42 and 42 are formed symmetrically in the vicinity of both ends 43 and 43 of the lower rail 41.
[0020]
As shown in FIGS. 4 (B) and 4 (C), the above-described symmetrical auxiliary handrail 30 has an upper rail such that the concave rail 35 of the upper rail 31 surrounds the handrail rail 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 placed close to and parallel to the horizontal bar 27 of the main handrail 20.
In this state, in FIG. 4 (B), the rotation bolt 44 is penetrated from above through the through holes 38 and 38 in the right end portion 39 of the upper bar 31 and the through hole 26a of the handrail bar 26 communicating therewith. Next, as shown in FIG. 4 (C), the male thread portion 45 of the bolt 44 penetrates the upper and lower flanges 32 and 34 of the right end (one end) 39 of the upper rail 31 and the handrail rail 26 of the main handrail 20. The cap nut 46 is screwed.
[0021]
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 through the through holes 52 opened in the horizontal piece 51 of the L-shaped metal fitting 50 fixed to the side column 21. The vertical piece 53 of the metal fitting 50 is fixed to the support column 21 in advance by bolts 54 and nuts 55. Next, as shown in FIG. 4C, the male of the bolt 47 penetrating the horizontal rail 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 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. The auxiliary handrail 30 can also be rotatably supported on the opposite end of the main handrail 20.
As shown in FIG. 4D, the rotation bolt 47 may be passed through the lower rail 41 of the auxiliary handrail 30 and the through hole 52 of the horizontal piece 51 in the metal fitting 50 and fastened to the nut 49. This form is particularly effective when the auxiliary handrail 30 is added to the existing main handrail 20 and attached. 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, the handrail unit TU is attached along the long side of the top plate 2 supported by the pair of legs 10 illustrated in FIG. B) and the foldable workbench 1 shown in FIGS. 2A and 2B can be formed.
4 (C) and 4 (D), the lower rail 41 of the auxiliary handrail 30 is a square pipe and is supported on the column 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 column 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 provided in advance in a symmetrical manner at the opposite ends of the main handrail 20.
[0024]
Next, a method for using the folding work table 1 will be described.
The top plate 2 in which the pair of leg portions 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 into the work site.
First, as shown in FIG. 1 (B) and FIG. 2 (B), the pair of leg portions 10 are extended symmetrically 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, the handrail unit TU is erected along the one long side of the top plate 2 using the pair of brackets 22, the metal fittings 28, and the pins P. In addition, 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, the space side that is not a target of work.
Then, as shown in FIGS. 4B, 4C, and 4D, with respect to the main handrail 20 in the handrail unit TU, the auxiliary handrail 30 is replaced with the auxiliary handrail 30 around the rotation bolts 44 and 47 as the rotation center. Rotate approximately 90 horizontally toward the long side of the top plate 2 without any other. Specifically, an operator who rides on the top board 2 performs a rotation operation in the horizontal direction while holding the upper rail 31 or the vertical rail 40 of the auxiliary handrail 30 and pulling it in the above direction.
[0025]
As a result, as shown in FIGS. 5A and 5B, the auxiliary handrail 30 has end portions (one end) 39, 43 through which the rotating bolts 44, 47 pass between the upper rail 31 and the lower rail 41. Positions on the main handrail 20 side and opposite end portions (the other ends) 39 and 43 are in a posture along the short side direction of the top plate 2. That is, the auxiliary handrail 30 is connected to the main handrail 20 on the right end side of the main handrail 20 erected along the long side of the front side of the top plate 2 as shown in FIG. 5 (A). The handrail 20 rotates horizontally until the opening angle θ between the handrail 20 and the handrail bar 26 is approximately 90 degrees in plan view. When the opening angle θ reaches approximately 90 degrees, the end surface 37 of the web 33 located on the end 39 side of the upper rail 31 of the auxiliary handrail 30 is moved toward the main handrail 20 as shown in FIG. It contacts the side surface of the handrail bar 26. As a result, the auxiliary handrail 30 is prevented from rotating and cantilevered in its posture.
[0026]
Therefore, as shown in FIGS. 5A and 5B, according to the folding workbench 1 of the present invention, the main handrail 20 is erected along the long side on the near side of the top plate 2. Thus, the auxiliary handrail 30 whose position is regulated at approximately 90 degrees (substantially at right angles) can be disposed in a cantilever manner on the right end side of the main handrail 20 by a simple operation of an operator riding on the top board 2. That is, in FIG. 5 (A), even if an operator gets on the top plate 2 from either the left or right leg portion 10, the auxiliary handrail 30 is pulled out while horizontally rotating, so that the long side on the depth side of the top plate 2 can be obtained. The necessary construction, repair, or inspection work can be performed on the wall surface. In addition, even when moving on the top plate 2 while working, the auxiliary handrail 30 can prevent the top plate 2 from going too far toward the short side, thereby ensuring work safety. In addition, the auxiliary handrail 30 can easily prevent a person other than the related person from rising from the leg portion 10 to the top plate 2.
The supporting position of the auxiliary handrail 30 on the main handrail 20 may be the left end side in FIGS. 1 (A) and 5 (A). At this time, the bolts 44 and the like are inserted into the through holes 38 and 42 of the end portions 39 and 43 on the opposite side of the upper rail 31 and the lower rail 41 in the auxiliary handrail 30.
[0027]
FIG. 6A shows an auxiliary handrail 30 a which is a modified form of the auxiliary handrail 30.
That is, as shown in FIG. 6 (A), the auxiliary handrail 30a has the same upper rail 31 and lower rail 41 as described above, and between them and between both end portions 39, 39, 43, 43 is the same as described above. A pair of vertical residues 40a and 40b made of a rectangular pipe are connected by welding or the like. By using the auxiliary handrail 30a having such a substantially rectangular frame (b-shaped) shape, the overall strength can be increased and the handling of the operator is facilitated.
[0028]
FIG. 6B shows an auxiliary handrail 30b which is an application form of the auxiliary handrail 30 and the auxiliary handrail 30a. That is, as shown in FIG. 6B, the auxiliary handrail 30b includes the upper rail 31, a lower rail 41a composed of the same upper rail 31, and a pair of vertical residues 40a and 40b that connect them in the same manner as described above. These are connected by welding or the like. By sharing the lower rail 41a with the upper rail 31, it is possible to store the auxiliary handrail 30b while storing both the handrail rail 26 and the horizontal rail 27 of the main handrail 20 sideways. For this reason, it becomes easy to make a stable posture without taking up space at the time of storage. Moreover, the L-shaped metal fitting 50 can be omitted, and the design is improved.
[0029]
FIG. 7A shows a plan view of a foldable workbench 1a which is an applied form of the foldable workbench 1. FIG. As shown in FIG. 7A, the foldable workbench 1a has a pair of leg portions 10 attached to the short sides on both sides of the top plate 2 as described above, along one long side of the top plate 2. The main handrail 20 that appears as a handrail bar 26 in the figure is erected, and a pair of auxiliary handrails 30 and 30 (30a and 30b: the same applies hereinafter) are supported symmetrically and rotatably near the both ends of the main handrail 20, respectively. is doing.
In the same manner as described above, an operator riding on the top board 2 draws a pair of auxiliary handrails 30 and 30 symmetrically from the vicinity of both ends of the main handrail 20 as shown by the dashed-dotted arrows in FIG. Rotate horizontally to leave each. As a result, as shown by a broken line in FIG. 7A, the pair of auxiliary handrails 30 and 30 are stopped in an upward posture as shown near both ends of the main handrail 20, that is, near the short sides on both sides of the top plate 2. . According to this, the worker can perform the required work more safely on the wall surface on the long side of the top plate 2 without the main handrail 20. The auxiliary handrail 30 (30a, 30b) also has an advantage of no directionality because both end portions 39, 43 of the upper / lower rails 31, 41 are symmetrical.
[0030]
FIG. 7B is a plan view of a foldable workbench 1b, which is a further application form of the foldable workbench 1. FIG. As shown in FIG. 7 (B), the foldable workbench 1b has a pair of leg portions 10 attached to the short sides on both sides of the top plate 2 in a foldable manner as described above, and is attached to both long sides of the top plate 2. The main handrails 20 and 20 appearing as handrail bars 26 in the figure are erected in parallel, and the pair of auxiliary handrails 30 and 30 are symmetrically and rotatable in the vicinity of both ends of the lower main handrail 20 in the figure. I support it.
FIG. 7C is a plan view of a foldable workbench 1b ′ having the same application form as described above. As shown in FIG. 7C, the foldable workbench 1b 'has a pair of leg portions 10 attached to the short sides on both sides of the top plate 2 in a foldable manner as described above. The main handrails 20 and 20 appearing as handrail bars 26 in the drawing are erected in parallel along the sides, and the pair of auxiliary handrails 30 and 30 are rotated symmetrically at one end of each main handrail 20 and at a diagonal position. Support each possible.
[0031]
As shown by the dashed-dotted arrows in FIGS. 7B and 7C, the symmetrical handrails 30 (30a, 30b) are symmetrical on the site where the folding workbench 1b, 1b ′ is used, for example, In the room where the construction work is performed near the ceiling, it is pulled out from the vicinity of an arbitrary end of the pair of main handrails 20 according to the work situation and rotated horizontally, and overlaps or approaches the handrail bar 26 of the other main handrail 20 Can be made. Therefore, it is possible to further enhance the safety of the operator on the top plate 2.
7C, the pair of handrail units TU composed of the main handrail 20 and the auxiliary handrail 30 can have the same structure.
[0032]
FIG. 8A is a plan view of an application form using two folding work tables 1a.
As shown in FIG. 8 (A), the two foldable work platforms 1a and 1a are arranged such that their top plates 2 and 2 are opposed to each other with their long sides parallel to each other. The auxiliary top plate 2a consisting only of the plate 2 is bridged between the receiving metal fittings (not shown) of the two work tables 1a to be closed. For this reason, as shown in FIG. 8 (A), the top plate 2, 2 and the auxiliary top plate 2a are arranged in parallel with their short sides in a straight line, and there is a large rectangular work space in plan view. Is formed. A pair of main handrails 20, 20 illustrated by handrail bars 26 are erected symmetrically with each other along the outer long sides of the top plates 2, 2, and the tops of the pair of main handrails 20 are provided. One end of the pair of auxiliary handrails 30 and 30 is individually supported rotatably at positions near the short sides on both sides of the plate 2.
[0033]
As shown by the one-dot chain line arrow in FIG. 8 (A), the left and right symmetrical auxiliary handrail 30 (30a, 30b) is horizontally rotated by approximately 90 degrees from the main handrail 20 and is cantilevered at the position of the broken line in the figure. Stop. As a result, a pair of main handrails 20 and four sets of auxiliary handrails except for the vicinity of the vicinity of the auxiliary top plate 2a in the periphery of a wide work space formed by the top plates 2, 2 and the auxiliary top plate 2a. By 30, the worker who entered the work space can be surrounded. Therefore, work near the ceiling can be performed safely and quickly, and it is easy to prevent a person other than the related person from inadvertently climbing the leg 10.
Note that four sets of auxiliary handrails 30 are not essential, and one to three sets can be appropriately supported only at necessary positions according to the situation on the site.
[0034]
FIG. 8B is a plan view of a different application form using two folding work tables 1. As shown in FIG. 8 (B), the two foldable work tables 1 and 1 are arranged such that their short sides face each other and are spaced apart from each other, and the top plate is between them. An auxiliary top plate 2a made up of only two is bridged between receiving brackets (not shown) of the respective work tables 1 and 1. That is, as shown in FIG. 8B, the top plates 2 and 2 and the auxiliary top plate 2a are arranged in series with each long side as a straight line, and a rectangular elongated work space is formed in plan view. On the top plates 2, 2 a, 2, three sets of main handrails 20 illustrated by handrail bars 26 are erected individually and linearly along the lower long side in FIG. 8B. . One end of the auxiliary handrail 30 (30a, 30b) is rotatably supported only in the main handrail 20 of the top plates 2 and 2 at both ends and in the vicinity of both ends of the elongated work space.
[0035]
As indicated by the one-dot chain line arrow in FIG. 8B, the two sets of auxiliary handrails 30 are horizontally rotated from the main handrail 20 by approximately 90 degrees and stopped in a cantilevered state at the position of the broken lines in the figure.
As a result, among the long and narrow work spaces formed by the top plates 2 and 2 and the auxiliary top plate 2a, three sets of the periphery of the three sides excluding the upper work target space in FIG. It can be surrounded by a main handrail 20 and two sets of auxiliary handrails 30. Therefore, it is possible to perform work along the outer wall and the inner wall safely and promptly.
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. Further, two folding work tables 1b are used, and the top plates 2 and 2 are arranged with the short sides facing each other and spaced apart from each other. Auxiliary top plate 2a in which a pair of main handrails 20 are erected may be bridged along a straight line.
[0036]
The present invention is not limited to the embodiments described above.
For example, the pair of pedestals 12 and 12 in the leg portion 10 has a known caster with a lock mechanism at the lower end (tip), an outrigger that advances and retreats 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 which attached the anti-slip material.
Further, a rotating hand shaft that can be upright may be attached in the vicinity of the upper end of at least one of the pair of pillars 12 and 12 in the leg portion 10.
Further, instead of the rotating bolts 44 and 47, pins having the same outer diameter may be used.
Moreover, it is good also considering the bending material of a steel material or a steel plate, or a steel pipe as the at least one part structural material in the said top plate 2, the leg part 10, the main handrail 20, and the auxiliary handrail 30. FIG.
The present invention can be variously modified without departing from the spirit of the present invention.
[Brief description of the drawings]
1A and 1B are a plan view or a front view showing one embodiment of a foldable 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.
FIG. 3A is a perspective view of a main handrail including an auxiliary handrail, and FIG. 3B is a partial vertical sectional view showing a structure for attaching the main handrail to a top plate.
4A is a perspective view of an auxiliary handrail, FIG. 4B is a perspective view showing accommodation of the auxiliary handrail and the main handrail, FIG. 4C is a vertical sectional view in the vicinity of the rotating bolt in FIG. FIG. 4D is a vertical sectional view similar to FIG.
5A and 5B are a perspective view corresponding to FIG. 2A and a right side view corresponding to FIG. 2B when the auxiliary handrail is rotated.
FIGS. 6A and 6B are perspective views showing different types of auxiliary handrails. FIGS.
FIGS. 7A to 7C are plan views showing different types of folding work tables. FIGS.
FIGS. 8A and 8B are plan views showing an application form using the folding work table.
FIG. 9 is a perspective view showing a conventional folding work table.
[Explanation of symbols]
1, 1a, 1b, 1b '...... Folding work table
2 ……………………………… Top plate
2a ……………………………… Auxiliary top plate
10 …………………………… Legs
20 …………………………… Main handrail
21 …………………………… Posts
26 …………………………… Handrail
27 …………………………… Horizontal crossing
30, 30a, 30b ......... Auxiliary handrail
31 ……………………………… Upper pier
32 ……………………………… Upper flange
33 …………………………… Web
34 ……………………………… Lower flange
36 …………………………… Resection (Resection)
37 …………………………… Web Edge
38,42 …………………… Through hole
39, 43 …………………… End / End / End
40, 40a, 40b ......... Vertical rail
41, 41a ………………… Lower pier
44, 47 …………………… Rotating bolt
50 …………………………… L-shaped metal fittings

Claims

A top plate that is rectangular in plan view, a pair of legs that are foldably attached to the short sides on both sides of the top plate, a main handrail erected along at least one long side of the top plate, and the top plate An auxiliary handrail near one short side of the plate and having one end 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 rail of the main handrail laterally from the inside, and has both ends obtained by cutting the web between a pair of upper and lower flanges. A folding work table characterized in that a through-hole of a rotating bolt or pin penetrating with the handrail bar of the main handrail is perforated.

The end surfaces of the web positioned at both ends of the upper rail of the auxiliary handrail contact the side surface of the main rail of the main rail when the auxiliary rail is rotated approximately 90 degrees horizontally from the main rail. Regulating rotation,
The foldable workbench according to claim 1.

The main handrail includes a pair of support columns standing at least from both ends of the long side of the top plate, the handrail rail connecting the upper ends of the pair of support columns, and the middle or lower portion of the pair of support columns. It has a horizontal rail that connects between each other,
2. A through hole of a lower rotating bolt or pin penetrating with a metal fitting fixed to a side surface of the main handrail column is drilled at at least one end of the lower rail of the auxiliary handrail. The foldable workbench according to 2.

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

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

Folding including a top plate that is rectangular in plan view, a pair of legs that are foldably attached to the short sides on both sides of the top plate, and a main handrail erected along at least one long side of the top plate Used for tatami work table,
An auxiliary handrail, which is supported near the short side of at least one of the top plates and is rotatably supported at one end by the main handrail, includes an upper rail, a lower rail, and a vertical rail connecting the upper and lower rails. The crosspiece has a U-shaped cross section surrounding the handrail crosspiece of the main handrail laterally from the inside and has both ends cut out of the web between the pair of upper and lower flanges. A through-hole of a rotating bolt or pin that penetrates with the handrail bar of the main handrail is drilled,
The end surfaces of the web located at both ends of the upper rail of the auxiliary handrail contact the side surface of the main rail of the main handrail when the auxiliary handrail is rotated approximately 90 degrees horizontally from the main handrail. Regulating rotation,
An auxiliary handrail used for a folding work table.