JP4022448B2

JP4022448B2 - Anti-bending device for preventing the receiving platform from being bent

Info

Publication number: JP4022448B2
Application number: JP2002225299A
Authority: JP
Inventors: 博池田; 智也島田
Original assignee: Kyokuto Kaihatsu Kogyo Co Ltd
Current assignee: Kyokuto Kaihatsu Kogyo Co Ltd
Priority date: 2002-08-01
Filing date: 2002-08-01
Publication date: 2007-12-19
Anticipated expiration: 2022-08-01
Also published as: JP2004066866A

Description

【０００１】
【発明の属する技術分野】
本発明は、貨物自動車などに搭載された荷受台昇降装置に取り付けられ、荷受台を渡し板として使用したときに当該荷受台が折れ曲がるのを防止する荷受台折れ曲がり防止装置に関する。
【０００２】
【従来の技術】
例えば貨物自動車用の荷受台昇降装置には、荷箱床下に格納した荷受台を油圧にてスライドさせ、かつ昇降させて荷物の積み降ろしを行うものがある。このような床下格納式の昇降装置では、一般的に荷受台は基部とこの基部の上方に折り畳み可能に連結された先部とを備えており、先部を折り畳むことで当該荷受台を床下にコンパクトに収納できるようになっている。また、荷受台昇降装置には、上記先部を基部に対して展開して荷受台を水平状態とするだけでなく、その展開した荷受台を上記水平状態から先部側を下方に傾斜させた前下がり状態に選択的に切り換える切換装置を設けたものが提供されており、前下がり状態にした荷受台を、荷箱床下よりも低い位置にあるプラットホームに対して架け渡し、荷箱とプラットホームとの間でコンテナなどの荷物を移載する渡し板として当該荷受台を使用可能に構成している。
【０００３】
ところが、上記のように荷受台を渡し板として使用している場合では、荷物の重量などによっては上記先部と基部との連結部分が下がり、その先部が基部に対して上記連結部分を起点に折れ曲がることがあった。この結果、荷物の積み降ろし作業を妨げたり、さらには荷物のぐらつきや転倒あるいは荷受台からの落下などを生じることがあった。そこで、例えば本出願人による特願２００１−４３８０４号に開示されているように、荷受台の基部及び先部にスライド移動可能に取り付けられた規制部材により、必要時に基部及び先部を一体化して荷受台の折れ曲がりを防止したものが実用化されている。
【０００４】
具体的には、図１３（ａ）及び（ｂ）において、基部１００ａと先部１００ｂとが上記連結部分としてのヒンジ１０１を介して連結された荷受台１００に対して、規制部材１０２が図１３（ａ）に示す位置から矢印Ｓにて示す方向にスライド可能に取り付けられている。そして、図１３（ｂ）に示すように、規制部材１０２が先部１００ｂ側にスライドされた場合に、規制部材１０２は基部１００ａ及び先部１００ｂを一体化し、先部１００ｂが基部上方に向かって折り畳まれる方向（図の矢印ｒにて図示する方向）に回動するのを防いで荷受台１００での折れ曲がりの発生を防止している。
【０００５】
詳細には、上記規制部材１０２は断面コ字状に形成されたものであり、図１３（ａ）に示すように、基部１００ａの側面及び上下面を囲むように当該基部１００ａの側方部に取り付けられている。この規制部材１０２の側面（荷受台側面の外側面）には、作業者が当該規制部材１０２を上記Ｓ方向又はその逆方向にスライド移動させるための取っ手１０２ａが設けられている。また、規制部材１０２の上記側面に形成された長孔１０２ｂには、基部１００ａに固定されたボルト１０３が挿通されており、規制部材１０２はボルト１０３により案内されてそのスライド移動が円滑に行えるようになっている。さらに、規制部材１０２の下面には、当該規制部材１０２をロックするロック装置１０４のロックピン１０４ａと係合する係合部材１０２ｃが荷受台１００の下方側に突出するように設けられている。
【０００６】
上記ロック装置１０４は、基部１００ａの下面に固定されたものであり、図示しないバネにより図の紙面の垂直方向で手前側に突出するよう付勢された上記ロックピン１０４ａと上記バネの付勢力に抗して当該ピン１０４ａを付勢方向と反対方向に押し込むための取っ手１０４ｂとを備えている。上記ロックピン１０４ａの先端部はテーパ状に形成されており、規制部材１０２が上記Ｓ方向に移動されるときに、上記先端部が係合部材１０２ｃと接触することで当該ピン１０４ａは上記付勢力に抗して徐々にかつ自動的に押し込まれ、規制部材１０２のＳ方向への移動を許容する。また、ロックピン１０４ａの先端部が係合部材１０２ｃから外れると、このピン１０４ａは上記付勢力によって突出し係合部材１０２ｃと係合可能な状態となる。そして、ロック装置１０４は、そのロックピン１０４ａと係合部材１０２ｃとが係合することにより、規制部材１０２のＳ方向とは反対方向への移動を制限して規制部材１０２による基部１００ａと先部１００ｂとを一体化した状態を保持する。
また、上記規制部材１０２及びロック装置１０４は、荷受台１００の左右の各側方部に設けられており、左右両側から基部１００ａ及び先部１００ｂの一体化を図るようになっている。
【０００７】
【発明が解決しようとする課題】
しかしながら、上記従来の荷受台折れ曲がり防止装置では、断面コ字状に形成された規制部材１０２が基部１００ａの側面及び上下面を囲むように当該基部１００ａの側方部に取り付けられていたので、規制部材１０２の図１３の上側部分が荷受台上面から突出しその突出した状態で当該規制部材１０２は基部１００ａと先部１００ｂとの間をスライド移動していた。このため、荷受台１００上で荷物を移動させているときに、荷物や作業者が規制部材１０２の上側部分に接触して、荷物の積み降ろし作業に支障をきたす恐れがあった。また、荷受台１００を水平状態にしている場合では、規制部材１０２は基部１００ａ側から先部１００ｂ側にスライド移動可能な状態であるので、この規制部材１０２の不必要な移動を防ぐために、当該規制部材１０２を基部１００ａ側にロックする別のロック装置を設けることも考えられる。しかしながら、規制部材１０２の移動前後にそのロック装置を操作する必要が生じたり、防止装置の部品点数が増加することにより、当該装置のコストアップを生じる。
また、この従来の防止装置では、荷受台１００の折れ曲がりの防止またはその防止解除を行うときに、作業者が荷受台１００の左右の各側方部に設けた規制部材１０２をスライド移動させる必要があり、さらに防止解除するときにはロックピン１０４ａを操作する必要があることから、当該防止装置の動作作業に手間及び時間を要して、荷物の積み降ろし作業の作業効率が低下することがあった。
【０００８】
上記のような従来の問題点に鑑み、本発明は、荷受台昇降装置により昇降させる荷受台を用いた荷物の積み降ろし作業を安全にかつ効率よく行うことができるコスト安価な荷受台折れ曲がり防止装置を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明は、基部及びこの基部に対して折り畳み可能に連結された先部を有する荷受台と、前記荷受台の全体または一部分を水平状態及び前記水平状態から先部側を下方に傾斜させた前下がり状態のいずれかの状態に選択的に切り換える切換装置とを備え、前記荷受台を昇降させるとともに、前記先部を前記基部に対して展開し、さらに前記切換装置によって前下がり状態に切り換えて当該荷受台を渡し板として使用できるようにした荷受台昇降装置に用いられ、前記荷受台を渡し板として使用しているときに前記先部が前記基部側に折れ曲がるのを防止する荷受台折れ曲がり防止装置であって、
前記荷受台の左右の側面から所定間隔をおいて設けられるとともに、その荷受台の基部または先部に回動可能に軸支された左右一対の規制部材と、前記基部及び前記先部の一方に設けられ、前記規制部材を受け止めるストッパと、前記基部及び前記先部の他方の側方に突出可能に設けられたロックピンを有し、このロックピンが前記ストッパによって受け止められた前記規制部材に係合することにより、前記先部を前記基部に対して折り畳む方向に当該規制部材が回動するのを規制するロック装置とを備えたことを特徴とするものである（請求項１）。
【００１０】
上記のように構成された荷受台昇降装置の荷受台折れ曲がり防止装置では、上記規制部材を荷受台の左右の各側面から所定間隔をおいて設けたことにより、荷受台を用いて荷物の積み降ろし作業を行っているときに荷物及び作業者が規制部材に接触するのを防ぐことができる。また、この規制部材はストッパによって受け止められている状態で、ロック装置のロックピンと係合しまたはロックピンとの係合が解除されることにより、荷受台の折れ曲がりの防止またはその防止解除を行うことができる。従って、上記従来例と異なり、荷受台の折れ曲がりの防止またはその防止解除を行うときに、作業者は規制部材を動かす必要がない。しかも、荷受台の折れ曲がりの防止解除をしているときは、ストッパによって規制部材の回動を抑えることができることから、荷物及び作業者が規制部材に接触するのを防ぐことができる点とも相まって、荷受台を水平状態にしている場合に規制部材をロックする専用のロック装置を設ける必要がなく、部品点数を抑えることができる。
【００１１】
また、上記荷受台昇降装置の荷受台折れ曲がり防止装置（請求項１）において、前記先部を前記基部に対して展開する方向に前記規制部材を付勢する弾性部材を設けることが好ましい（請求項２）。
この場合、上記規制部材は弾性部材によって上記展開する方向に付勢され、かつストッパにより受け止められた状態で、ロックピンとの係合及びその解除が行われることとなり、当該規制部材の姿勢を安定させることができる。
【００１２】
また、上記荷受台昇降装置の荷受台折れ曲がり防止装置（請求項１または２）において、前記ロック装置が、前記ロックピンの左右の両端部を同時に動かして前記左右一対の規制部材に対するロックまたはそのロック解除を一斉に行う操作レバーを備えることが好ましい（請求項３）。
この場合、上記操作レバーによって左右一対の規制部材を一斉にロックし、または一斉にロックの解除を行うことができ、荷受台の折れ曲がり防止とその防止解除との切換作業を簡単に素早く行うことができる。
【００１３】
【発明の実施の形態】
以下、本発明の荷受台昇降装置の荷受台折れ曲がり防止装置を示す好ましい実施形態について、図面を参照しながら説明する。尚、以下の説明では、本発明を床下格納式の荷受台昇降装置に適用した場合を例示して説明する。
図１は本発明の一実施形態に係る荷受台昇降装置の荷受台折れ曲がり防止装置を適用した車体後部の側面図である。尚、この図は車体の左側面側から見た図であるが、車体の右側面側から見た図は左右対称な同様の構造となる（以下同様）。
図において、車体５０のシャーシ５１の上方には開閉可能な扉を後部に設けた荷箱５２が搭載されている。また、この荷箱５２の下方には、荷受台昇降装置１が設けられており、作業者の負担を大幅に軽減して荷箱５２に対するコンテナ等の荷物の積み降ろし作業を行えるようになっている。
【００１４】
上記荷受台昇降装置１は、シャーシ５１に垂直に取り付けられたアングル状の一対の取付部材２及びこれら取付部材２の間で水平に固定されたガイドフレーム３を有する支持装置４と、車体前後方向にスライド移動可能に上記ガイドフレーム３に取り付けられた取付部材５とを備えている。上記支持装置４と取付部材５との間には図２に示すスライドシリンダ６が設けられており、このスライドシリンダ６を駆動することで取付部材５は上記ガイドフレーム３に沿って移動する。これにより、荷受台昇降装置１は、車両走行時には荷受台７を荷箱５２の下方に格納した状態（図１）とし、荷受台使用時には当該荷受台７を後方に引きだした状態（図２）とするようになっている。
また、上記取付部材５には平行リンク８を構成する上リンク９及び下リンク１０の各一端部が軸支されており、これら上リンク９及び下リンク１０の各他端部には上記荷受台７が連結されている。また、取付部材５と上リンク９との間には、昇降シリンダ１１が設けられており、この昇降シリンダ１１を伸縮動作させることで荷受台７を上下方向に昇降するようになっている（図４参照）。
【００１５】
上記荷受台７は、平行リンク８に回動可能に連結された第１基部材７ａ１とこの第１基部材７ａ１にヒンジ７ｃを介して連結された第２基部材７ａ２とを有する基部７ａ及び第２基部材７ａ２にヒンジ７ｄを介して連結された先部７ｂを備えており、第２基部材７ａ２及び先部７ｂはそれぞれ第１基部材７ａ１の上方及び第２基部材７ａ２の上方にそれぞれ折り畳み可能に構成されている。そして、この荷受台７は、第２基部材７ａ２及び先部７ｂをそれぞれ第１基部材７ａ１及び第２基部材７ａ２に対して折り畳んだコンパクトな状態（図１）から第２基部材７ａ２を展開した状態（図３に二点鎖線にて図示）を経て、先部７ｂを展開し第１基部材７ａ１、第２基部材７ａ２、及び先部７ｂによって同一平面（荷受面）を形成した状態（図４）とすることができる。また、上記平行リンク８の基部の一部が若干移動することにより、図４の二点鎖線にて示すように、先部７ｂの先端部が地面に接するよう荷受台７は傾くことが可能となっている。これにより、荷箱５２と地上との間の荷物の移動作業を上記荷受面を用いて容易に行うことができる。
【００１６】
上記第２基部材７ａ２には、第１基部材７ａ１に対して当該第２基部材７ａ２を同一平面にした状態及び下方に屈折させた状態のいずれかの状態とする切換装置１２（図４）が設けられており、荷受台７の全体を水平にした水平状態（水平モード）及び第１基部材７ａ１を除いた荷受台７の一部分（すなわち、第２基部材７ａ２及び先部７ｂ）を前下がりにした前下がり状態（ブリッジモード）のいずれかの状態に選択的に切り換えられるようになっている。そして、この切換装置１２によって上記水平状態としたときに、図４に示すように、荷受台７はその最上昇端位置で荷箱床下と同一高さとなるよう昇降される。また、切換装置１２によって上記前下がり状態に切り換えることにより、図５に示すように、荷箱床下よりも低い位置にあるプラットホーム６０に荷受台７を架け渡すことができ、当該荷受台７を渡し板として使用することができる。
【００１７】
上記切換装置１２は、図６に示すように、第２基部材７ａ２の基端に回動可能に設けられた回動部材１２ａと、第１基部材７ａ１の表面に取り付けられ、上記回動部材１２ａと接する接触部材１２ｂとを具備している。また、切換装置１２には、上記回動部材１２ａを回動させる操作部材１２ｃと、回動部材１２ａを図６（ａ）に示す水平モード位置または図６（ｂ）に示すブリッジモード位置で保持するためのバネ１２ｄとが設けられている。そして、切換装置１２は、図６（ａ）に示すように、回動部材１２ａを接触部材１２ｂに接触させることにより、第１基部材７ａ１及び第２基部材７ａ２を同一平面の状態とし荷受台７を水平状態に保持する。このように、切換装置１２が荷受台７を水平状態に保持しているときは、回動部材１２ａと接触部材１２ｂとが互いに接触していることから、上記ヒンジ７ｄが荷受台７上の荷物等の重量により下方に下がるのを防ぐことができ、先部７ｂが第２基部材７ａ２側に折り曲がるのを防止することができる。
また、切換装置１２は、図６（ｂ）に示すように、回動部材１２ａの接触部材１２ｂとの接触状態を解除することにより、第２基部材７ａ２が第１基部材７ａ１に対して角度α下方に下がるのを許容し荷受台７を前下がり状態とする。上記操作部材１２ｃは、図７に示すように、荷受台７の底面側で車幅方向に設けられており、左右の切換装置１２の各回動部材１２ａを同時に回動させるようになっている。
【００１８】
また、上記荷受台７には、図７に示すように、本発明の荷受台折れ曲がり防止装置１３が荷受台７の左右の各側方部に設けられており、当該荷受台７を渡し板として使用しているときに先部７ｂが基部７ａ側に折れ曲がるのを防止している。
上記荷受台折れ曲がり防止装置１３は、図７〜図９を参照して、上記第２基部材７ａ２及び先部７ｂの各側面から側方へ離れた位置で回動するように第２基部材７ａ２に軸支された規制部材１４と、この規制部材１４の回動軸１４ａに取り付けられ、先部７ｂを第２基部材７ａ２に対して展開する方向に規制部材１４を付勢する弾性部材としてのスプリング１５とを備えている。また、この防止装置１３には、先部７ｂに設けられ、規制部材１４の上記展開する方向への回動を規制するストッパ１６と、第２基部材７ａ２に取り付けられ、先部７ｂを第２基部材７ａ２に対して折り畳む方向に規制部材１４が回動するのを規制するロック装置１７とが設けられている。
【００１９】
上記規制部材１４は、図９（ａ）及び（ｂ）に示す取付カバー１８を介して第２基部材７ａ２の側方部に取り付けられている。この取付カバー１８は、断面コ字状に形成されたものであり、第２基部材７ａ２の上面及び底面に設けられた段差部（図示せず）に装着される。また、この取付カバー１８は、第２基部材７ａ２に取り付けられたときに少なくとも上面１８ａが第２基部材７ａ２の上面と面一となるよう構成されており、当該取付カバー１８が荷受台７上での荷物の移動作業を極力妨げないようになっている。尚、図９に示す取付カバー１８は、荷受台７の左側方部に取り付けられるものであり、図７に示す荷受台右側方部に取り付けられるものと異なり、ロックレバー１９を回動操作する操作機構２０（図７）を第２基部材７ａ２に固定するための切り欠き部１８ｂ１が底面１８ｂに形成されている（図９（ｂ）参照）。上記ロックレバー１９は、図８（ｂ）に示すように、先部７ｂの先端部に設けられた固定ピン２１と係合することにより、第２基部材７ａ２の上方に折り畳まれた先部７ｂを当該第２基部材７ａ２に固定する。
【００２０】
上記ストッパ１６は、図８（ａ）に示すように、先部７ｂの上面から突出しないように当該先部７ｂの側面に取り付けられたものであり、断面凹状に形成され、その凹部内にスプリング１５によって上記展開する方向に付勢された規制部材１４の一端部を受け止めている。また、これらストッパ１６及び規制部材１４は、先部７ｂが第２基部材７ａ２に対し展開または折り畳まれるときに、規制部材１４が先部７ｂとともに回動するよう構成されており、先部７ｂの回動動作に応じて当該規制部材１４の一端部側がストッパ１６の凹部内を摺動しストッパ１６により受け止められた状態を維持しつつ、規制部材１４は上記展開する方向または折り畳む方向に回動する。
【００２１】
上記ロック装置１７は、図７に示すように、上記第２基部材７ａ２の左右の側方にそれぞれ突出可能に設けられた両端部材１７ａ１，１７ａ２を有するロックピン１７ａと、これら左右の両端部材１７ａ１，１７ａ２を同時に動かして荷受台７の左右の各側方部に設けられた一対の上記規制部材１４に対するロックまたはそのロック解除を一斉に行う操作レバー１７ｂとを備えたものであり、上記両端部材１７ａ１，１７ａ２が対応する規制部材１４の他端部側に設けられた係合孔１４ｂ内に挿通されることにより、ロック装置１７は規制部材１４の上記折り畳む方向への回動を規制する。これにより、荷受台７を前下がり状態にしているときに上記ヒンジ７ｄが荷受台７上の荷物等の重量により下方に下がるのを防ぐことができ、先部７ｂが第２基部材７ａ２側に折れ曲がるのを防止することができる。
【００２２】
詳細にいえば、上記ロック装置１７には、図１０（ａ）及び（ｂ）を参照して、操作レバー１７ｂに一体回転可能に連結された回転盤１７ｃと、この回転盤１７ｃに約１８０度の位相差で一端部が揺動自在に取り付けられた２つの揺動リンク１７ｄ，１７ｅとが設けられている。これらの揺動リンク１７ｄ，１７ｅの他端部には、上記ロックピン１７ａの左右の両端部材１７ａ１，１７ａ２がそれぞれ連結されている。これらの各両端部材、例えば両端部材１７ａ１は、固定ピン１７ｆにより上記取付カバー１８の上面及び第２基部材７ａ２に固定されたガイド部材１７ｇのガイド孔内にスライド可能に配置されており、図１０（ａ）の実線にて示す位置から同図の二点鎖線にて示す位置に操作レバー１８ｂを９０度回転させることにより、両端部材１７ａ１は第２基部材７ａ２の左側方に突出する。この結果、両端部材１７ａが規制部材１４の係合孔１４ｂを挿通して、当該規制部材１４の上記折り畳む方向への回動を規制する。
【００２３】
ここで、荷受台７を渡し板として使用する上記ブリッジモードを選択する場合での荷受台折れ曲がり防止装置１３の作業手順について説明する。
作業者は荷受台昇降装置１を駆動して、水平状態の荷受台７を図４に示す最下降位置にした後、図８（ｂ）に示したように先部７ｂを第２基部材７ａ２に対して折り畳む。このとき、規制部材１４はスプリング１５の付勢力に抗して先部７ｂとともに折り畳む方向に回動される。続いて、作業者は、図３に示したように、スライドシリンダ６の先端部に設けられたガイドローラ６ａに第２基部材７ａ２及び先部７ｂを立て掛けた後、切換装置１２の操作部材１２ｃを回動させることにより、当該切換装置１２の回動部材１２ａを水平モード位置（図６（ａ））からブリッジモード位置（図６（ｂ））に切り換える。
【００２４】
次に、作業者が、図８（ａ）に示したように先部７ｂを第２基部材７ａ２に対して展開すると、規制部材１４はスプリング１５の付勢力により先部７ｂとともに展開する方向に回動される。そして、作業者が図１０（ａ）に二点鎖線にて示したように、ロック装置１７の操作レバー１７ｂを回転操作することにより、ロックピン１７ａの両端部材１７ａ１，１７ａ２が第２基部材７ａ２の左右側方から突出し規制部材１４の係合孔１４ｂ内に挿通する。これにより、ロック装置１７は規制部材１４の上記折り畳む方向への回動を規制し、防止装置１３は先部７ｂが第２基部材７ａ側に折り曲がるのを防止する。
【００２５】
以上のように構成された本実施形態の荷受台折れ曲がり防止装置１３では、規制部材１４が荷受台７の第２基部材７ａ２及び先部７ｂの各側面から側方へ離れた位置で回動するので、当該荷受台７を前下がり状態にして渡し板として使用しているときでも荷物及び作業者が規制部材１４に接触するのを防ぐことができ、荷物の積み降ろし作業を支障なく行うことができる。また、先部７ｂが第２基部材７ａ２に対し展開または折り畳まれるときに、規制部材１４は先部７ｂとともに回動することができるので、作業者は規制部材１４を動かすことなく荷受台７の折れ曲がりの防止またはその防止解除を行うことができ、当該防止装置１３の動作作業を素早くかつ簡単に行うことができ、荷物の積み降ろし作業を効率よく行うことができる。しかも、荷受台７を水平状態にしている場合では、規制部材１４はスプリング１５の付勢力により上記折り畳む方向への回動が抑えられ、さらにストッパ１６により上記展開する方向への回動が規制されるので、この水平状態にしている場合に規制部材１４をロックする専用のロック装置を設ける必要がない。さらには、規制部材１４のロックピン１７ａとの係合及びその解除を行うときに、スプリング１５とストッパ１６とにより当該規制部材１４の姿勢を安定させることができることから、荷受台７の折れ曲がりの防止及びその防止解除を円滑に行うことができる。
【００２６】
また、本実施形態では、ロック装置１７の操作レバー１７ｂにより、左右一対の規制部材１４に対するロック及びそのロック解除を一斉に行うことができるので、荷受台７の折れ曲がり防止とその防止解除との切換作業を簡単に素早く行うことができ、結果として荷物の積み降ろし作業の作業効率を高めることができる。
【００２７】
尚、上記の説明では、規制部材１４を第２基部材７ａ２に回動可能に設けた構成について説明したが、本発明は回転式の規制部材を荷受台の側面から所定間隔をおいて設けたものであればよく、規制部材１４を先部７ｂに回動可能に設けてもよい。
また、上記の説明ではストッパ１６を先部７ｂに設け、上記ロックピン１７ａを有するロック装置１７を第２基部材７ａ２に設けた構成について説明したが、これらのストッパ１６及びロック装置１７は基部７ａ及び先部７ｂのいずれか一方及び他方に設けるものであればよく、ストッパ１６及びロック装置１７を第２基部材７ａ２及び先部７ｂにそれぞれ設けてもよい。
【００２８】
また、上記の説明では、規制部材１４に係合孔１４ｂを設けてロックピン１７ａを挿通させる構成について説明したが、本発明はロック装置１７により規制部材１４の上記折り畳む方向への回動を規制できる構成であればよく、例えば図８（ａ）に示す規制部材１４の下方位置にロックピン１７ａを突出させ、折り畳む方向への回動を規制してもよい。
また、上記の説明では、車体５０の後方に引き出される荷受台昇降装置１に適用した場合について説明したが、本発明は側方に引き出される荷受台昇降装置にも同様に適用することができる。
【００２９】
また、上記の説明では、床下格納式の荷受台昇降装置に適用した場合について説明したが、本発明はこれに限定されるものではなく、基部とこの基部に対して折り畳み可能に連結された先部とを有する荷受台であって、切換装置により水平状態及び前下がり状態のいずれかに切り換えられるとともに、前下がり状態にした荷受台を荷物の積み降ろし経路としての渡し板に使用できるものであればよい。具体的には、例えば図１１に示す起立格納式の荷受台昇降装置に適用することができる。また、図１２に示すように、車体後端に立設された左右一対のコラム３２と、このコラム３２内に配置され、上下方向に昇降するスライダ３３とを有し、スライダ３３に連結した荷受台７を垂直昇降させる垂直昇降式の荷受台昇降装置にも適用することができる。
【００３０】
【発明の効果】
以上のように構成された本発明は以下の効果を奏する。
請求項１の荷受台昇降装置の荷受台折れ曲がり防止装置によれば、荷受台を用いて荷物の積み降ろし作業を行っているときに荷物及び作業者が規制部材に接触するのを防ぐことができるので、その積み降ろし作業を支障なく行うことができる。また、上記従来例と異なり、作業者は規制部材を動かすことなく荷受台の折れ曲がり防止及びその防止解除を行うことができるので、当該防止装置の動作作業を素早くかつ簡単に行うことができ、荷物の積み降ろし作業を効率よく行うことができる。しかも、荷受台を水平状態にしている場合に規制部材をロックする専用のロック装置を設ける必要がなく、部品点数を抑えることができるので、コスト安価な防止装置を提供することができる。
【００３１】
また、請求項２の荷受台昇降装置の荷受台折れ曲がり防止装置によれば、規制部材の姿勢を安定させることができるので、荷受台の折れ曲がりの防止及びその防止解除を円滑に行うことができ、作業者の負担をさらに軽減できる。
【００３２】
また、請求項３の荷受台昇降装置の荷受台折れ曲がり防止装置によれば、上記荷受台の折れ曲がり防止とその防止解除との切換作業を簡単に素早く行うことができるので、当該荷受台を渡し板として使用する荷物の積み降ろし作業をより迅速に、かつさらに効率よく行うことができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る荷受台昇降装置の荷受台折れ曲がり防止装置を適用した車体後部の側面図である。
【図２】上記荷受台昇降装置を後方へ引きだした状態を示す側面図である。
【図３】上記荷受台昇降装置の荷受台を展開する（又は折り畳む）過程を示す側面図である。
【図４】水平状態の上記荷受台を昇降させる状態を示す側面図である。
【図５】前下がり状態の上記荷受台を渡し板として使用する状態を示す側面図である。
【図６】図４に示した切換装置の要部構成例を示す拡大側面図であり、（ａ）及び（ｂ）はそれぞれ上記荷受台を水平状態及び前下がり状態に切り換えた場合での同切換装置の拡大側面図である。
【図７】先部を基部に対して展開した状態での上記荷受台の底面図である。
【図８】（ａ）及び（ｂ）は、それぞれ先部を基部に対して展開した状態及び折り畳んだ状態での上記荷受台の側面図である。
【図９】図８に示した規制部材及びこれを付勢するスプリング（弾性部材）を示す拡大図であり、（ａ）及び（ｂ）はそれぞれ拡大側面図及び拡大底面図である。
【図１０】（ａ）及び（ｂ）は、それぞれ図７に示したロック装置の構成例を示す拡大構造図及び拡大断面図である。
【図１１】他の実施形態に係る荷受台昇降装置の荷受台折れ曲がり防止装置を適用した車体後部の側面図である。
【図１２】他の実施形態に係る荷受台昇降装置の荷受台折れ曲がり防止装置を適用した車体後部の側面図である。
【図１３】従来の荷受台折れ曲がり装置の要部構成を示す側面図であり、（ａ）及び（ｂ）はそれぞれ同装置の規制部材を移動させる前の状態及び移動させた後の状態を示す側面図である。
【符号の説明】
１荷受台昇降装置
７荷受台
７ａ基部
７ａ１第１基部材
７ａ２第２基部材
７ｂ先部
１２切換装置
１３荷受台折れ曲がり防止装置
１４規制部材
１５スプリング（弾性部材）
１６ストッパ
１７ロック装置
１７ａロックピン
１７ａ１，１７ａ２両端部材（両端部）
１７ｂ操作レバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load receiving base bending prevention device that is attached to a load receiving base lifting device mounted on a truck or the like and prevents the load receiving base from being bent when the load receiving base is used as a transfer plate.
[0002]
[Prior art]
For example, there is a load receiving / lifting device for a cargo vehicle in which a load receiving table stored under a floor of a cargo box is slid hydraulically and lifted / lowered to load / unload a load. In such an underfloor retractable lifting device, the load receiving platform generally includes a base and a front portion that is foldably connected to the upper portion of the base, and the front of the load receiving stand is folded under the floor by folding the front portion. It can be stored compactly. In addition, the load receiving platform lifting / lowering device not only expands the tip portion with respect to the base portion so that the load receiving stand is in a horizontal state, but the expanded load receiving stand is inclined downward on the front portion side from the horizontal state. There is provided a switching device that selectively switches to a forwardly lowered state, and a load receiving table that is in a forwardly lowered state is bridged to a platform that is lower than the bottom of the cargo box floor, and the cargo box and the platform The cargo receiving platform can be used as a transfer plate for transferring a cargo such as a container.
[0003]
However, in the case where the load receiving platform is used as a transfer plate as described above, the connecting portion between the front portion and the base portion is lowered depending on the weight of the load, and the leading portion starts from the connecting portion with respect to the base portion. There were times when it was bent. As a result, the loading / unloading operation of the load may be hindered, and the load may be wobbled, fallen or dropped from the load receiving table. Therefore, for example, as disclosed in Japanese Patent Application No. 2001-43804 filed by the present applicant, the base and the front part are integrated when necessary by a regulating member slidably attached to the base and the front part of the load receiving table. What prevents the bending of the receiving platform has been put into practical use.
[0004]
Specifically, in FIGS. 13A and 13B, the regulating member 102 is shown in FIG. 13 with respect to the load receiving platform 100 in which the base portion 100a and the tip portion 100b are connected via the hinge 101 as the connecting portion. It is slidably attached in the direction indicated by the arrow S from the position shown in FIG. And as shown in FIG.13 (b), when the control member 102 is slid to the front part 100b side, the control member 102 integrates the base part 100a and the front part 100b, and the front part 100b faces the base upper part. The folding in the load receiving platform 100 is prevented by preventing the folding in the folding direction (the direction shown by the arrow r in the figure).
[0005]
Specifically, the restriction member 102 is formed in a U-shaped cross section, and as shown in FIG. 13A, the restriction member 102 is formed on the side portion of the base portion 100a so as to surround the side surface and the upper and lower surfaces of the base portion 100a. It is attached. A handle 102a is provided on the side surface of the regulating member 102 (the outer surface of the side surface of the cargo receiving table) so that the operator can slide the regulating member 102 in the S direction or the opposite direction. A bolt 103 fixed to the base portion 100a is inserted into the long hole 102b formed in the side surface of the restricting member 102, and the restricting member 102 is guided by the bolt 103 so that the sliding movement can be smoothly performed. It has become. Furthermore, an engaging member 102 c that engages with the lock pin 104 a of the locking device 104 that locks the restriction member 102 is provided on the lower surface of the restriction member 102 so as to protrude downward from the load receiving platform 100.
[0006]
The locking device 104 is fixed to the lower surface of the base portion 100a, and is applied to the urging force of the locking pin 104a urged by a spring (not shown) so as to protrude to the near side in the direction perpendicular to the paper surface of the drawing and the spring. A handle 104b for pushing the pin 104a in a direction opposite to the biasing direction is provided. The distal end portion of the lock pin 104a is formed in a tapered shape, and when the restricting member 102 is moved in the S direction, the distal end portion comes into contact with the engaging member 102c so that the pin 104a has the urging force. It is pushed in gradually and automatically against this, allowing the restricting member 102 to move in the S direction. Further, when the distal end portion of the lock pin 104a is disengaged from the engaging member 102c, the pin 104a protrudes by the urging force and can be engaged with the engaging member 102c. The lock device 104 is configured such that the lock pin 104a and the engagement member 102c engage with each other, thereby restricting the movement of the restriction member 102 in the direction opposite to the S direction, and the base 100a and the front part by the restriction member 102. The state where 100b is integrated is maintained.
The regulating member 102 and the locking device 104 are provided on the left and right side portions of the load receiving platform 100, and the base portion 100a and the front portion 100b are integrated from both the left and right sides.
[0007]
[Problems to be solved by the invention]
However, in the conventional load receiving base bending prevention device, since the regulating member 102 formed in a U-shaped cross section is attached to the side portion of the base portion 100a so as to surround the side surface and the upper and lower surfaces of the base portion 100a. The upper part of the member 102 in FIG. 13 protrudes from the upper surface of the load receiving table, and the restricting member 102 slides between the base part 100a and the front part 100b. For this reason, when the load is moved on the load receiving platform 100, the load or the operator may come into contact with the upper portion of the restricting member 102, which may hinder the load / unload operation. Further, when the load receiving platform 100 is in a horizontal state, the regulating member 102 is slidably movable from the base portion 100a side to the front portion 100b side. Therefore, in order to prevent unnecessary movement of the regulating member 102, It is also conceivable to provide another locking device that locks the regulating member 102 on the base 100a side. However, it becomes necessary to operate the locking device before and after the movement of the regulating member 102, and the number of parts of the prevention device increases, resulting in an increase in the cost of the device.
Further, in this conventional prevention device, when preventing the bending of the load receiving base 100 or releasing the prevention, it is necessary for the operator to slide the restriction members 102 provided on the left and right side portions of the load receiving base 100. In addition, since it is necessary to operate the lock pin 104a when canceling the prevention, the operation work of the prevention device takes time and effort, and the work efficiency of the loading and unloading work may be reduced.
[0008]
In view of the conventional problems as described above, the present invention provides a low-cost load receiving base bending prevention device capable of safely and efficiently performing a loading and unloading operation of a load using a load receiving base that is lifted and lowered by a load receiving base lifting device. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The present invention relates to a load receiving platform having a base and a front portion that is foldably connected to the base, and the whole or a part of the load receiving platform is in a horizontal state and before the front portion is inclined downward from the horizontal state. A switching device that selectively switches to any one of the lowered states, and raises and lowers the load receiving table, expands the front portion with respect to the base, and further switches to the front lowered state by the switching device. A load receiving base bending prevention device which is used in a load receiving base lifting device which can use a load receiving base as a transfer plate, and prevents the front portion from being bent toward the base side when the load receiving base is used as a transfer plate. Because
A pair of left and right regulating members provided at predetermined intervals from the left and right side surfaces of the load receiving table and pivotally supported by the base or the front portion of the load receiving table, and one of the base and the front portion A stopper for receiving the restriction member, and a lock pin provided so as to protrude to the other side of the base portion and the tip portion. The lock pin is associated with the restriction member received by the stopper. And a locking device for restricting rotation of the restricting member in a direction in which the tip portion is folded with respect to the base portion (Claim 1).
[0010]
In the load receiving base bending prevention device of the load receiving base lifting device configured as described above, the regulation member is provided at a predetermined interval from the left and right side surfaces of the load receiving base, so that the loading / unloading of the load using the load receiving base is performed. It is possible to prevent the load and the worker from coming into contact with the regulating member when the work is being performed. In addition, when the restricting member is received by the stopper, it can be prevented from being bent or prevented from being bent by engaging the lock pin of the lock device or releasing the engagement with the lock pin. it can. Therefore, unlike the conventional example, the operator does not need to move the restricting member when preventing or canceling the bending of the load receiving table. In addition, when the prevention of the bending of the load receiving stand is being released, the rotation of the restricting member can be suppressed by the stopper, coupled with the point that the load and the operator can be prevented from contacting the restricting member, There is no need to provide a dedicated locking device for locking the restricting member when the load receiving stand is in a horizontal state, and the number of parts can be reduced.
[0011]
Further, in the load receiving device bending prevention device (Claim 1) of the load receiving device lifting / lowering device, it is preferable to provide an elastic member for urging the restricting member in a direction in which the tip portion is expanded with respect to the base portion. 2).
In this case, the restricting member is urged in the expanding direction by the elastic member, and is engaged with and released from the lock pin in a state where the restricting member is received by the stopper, thereby stabilizing the posture of the restricting member. be able to.
[0012]
Further, in the load receiving device bending prevention device (Claim 1 or 2) of the load receiving device lifting / lowering device, the lock device moves the left and right ends of the lock pin at the same time to lock or lock the pair of left and right regulating members. It is preferable to provide an operation lever that performs simultaneous release.
In this case, the control lever can be used to lock the pair of right and left regulating members at the same time, or to release the lock at the same time, and to easily and quickly switch between the prevention of the load receiving base from being bent and the release of the prevention. it can.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment showing a load receiving base bending prevention device of a load receiving stand lifting device of the present invention will be described with reference to the drawings. In the following description, a case where the present invention is applied to an underfloor retractable load receiving device lifting device will be described as an example.
FIG. 1 is a side view of a rear part of a vehicle body to which a load receiving base bending prevention device of a load receiving base lifting device according to an embodiment of the present invention is applied. Note that this figure is a view seen from the left side of the vehicle body, but the view seen from the right side of the vehicle has the same symmetrical structure (the same applies hereinafter).
In the figure, a cargo box 52 provided with a door that can be opened and closed is mounted above a chassis 51 of a vehicle body 50. In addition, the load receiving platform lifting / lowering device 1 is provided below the packing box 52 so that the load on the packing box 52 can be loaded and unloaded by greatly reducing the burden on the operator. Yes.
[0014]
The load receiving platform lifting / lowering device 1 includes a pair of angled mounting members 2 that are vertically mounted on a chassis 51 and a support device 4 that has a guide frame 3 that is horizontally fixed between the mounting members 2 and a vehicle body longitudinal direction. And an attachment member 5 attached to the guide frame 3 so as to be slidable. A slide cylinder 6 shown in FIG. 2 is provided between the support device 4 and the attachment member 5, and the attachment member 5 moves along the guide frame 3 by driving the slide cylinder 6. As a result, the load receiving platform lifting / lowering apparatus 1 is in a state in which the load receiving stand 7 is stored below the load box 52 when the vehicle is traveling (FIG. 1), and when the load receiving stand is used, the load receiving stand 7 is pulled out rearward (FIG. 2). It is supposed to be.
The mounting member 5 is pivotally supported at each end of an upper link 9 and a lower link 10 constituting a parallel link 8, and the other receiving end of each of the upper link 9 and the lower link 10 is supported by the load receiving platform. 7 are connected. Further, an elevating cylinder 11 is provided between the attachment member 5 and the upper link 9, and the elevating cylinder 11 is expanded and contracted to elevate the load receiving platform 7 in the vertical direction (see FIG. 4).
[0015]
The load receiving platform 7 includes a first base member 7a1 rotatably connected to the parallel link 8, and a second base member 7a2 connected to the first base member 7a1 via a hinge 7c and a second base member 7a2. A tip portion 7b connected to the two base members 7a2 via a hinge 7d is provided, and the second base member 7a2 and the tip portion 7b are respectively folded above the first base member 7a1 and above the second base member 7a2. It is configured to be possible. And this load receiving stand 7 expand | deploys the 2nd base member 7a2 from the compact state (FIG. 1) which folded the 2nd base member 7a2 and the front part 7b with respect to the 1st base member 7a1 and the 2nd base member 7a2, respectively. After the state (shown by a two-dot chain line in FIG. 3), the front portion 7b is developed and the first base member 7a1, the second base member 7a2, and the front portion 7b form the same plane (the receiving surface) ( FIG. 4). Further, when a part of the base portion of the parallel link 8 is slightly moved, the load receiving platform 7 can be tilted so that the front end portion of the front portion 7b is in contact with the ground as shown by a two-dot chain line in FIG. It has become. Thereby, the movement operation | work of the load between the packing box 52 and the ground can be easily performed using the said load receiving surface.
[0016]
The second base member 7a2 includes a switching device 12 (FIG. 4) that sets the second base member 7a2 to a state where the second base member 7a2 is in the same plane or is refracted downward. And a horizontal state (horizontal mode) in which the entire load receiving platform 7 is leveled and a part of the load receiving platform 7 excluding the first base member 7a1 (that is, the second base member 7a2 and the front portion 7b) It can be selectively switched to any one of the front-falling state (bridge mode) that has been lowered. When the switching device 12 is set to the horizontal state, as shown in FIG. 4, the load receiving platform 7 is moved up and down so that it is at the same height as the bottom of the cargo box floor at its highest end position. Further, by switching to the forwardly lowered state by the switching device 12, as shown in FIG. 5, the load receiving platform 7 can be bridged to the platform 60 at a position lower than the bottom of the cargo box floor. Can be used as a board.
[0017]
As shown in FIG. 6, the switching device 12 is attached to the rotation member 12a rotatably provided at the base end of the second base member 7a2 and the surface of the first base member 7a1, and the rotation member And a contact member 12b in contact with 12a. Further, the switching device 12 holds the operating member 12c for rotating the rotating member 12a and the rotating member 12a at the horizontal mode position shown in FIG. 6A or the bridge mode position shown in FIG. 6B. A spring 12d is provided. As shown in FIG. 6A, the switching device 12 brings the first base member 7a1 and the second base member 7a2 into the same plane state by bringing the rotating member 12a into contact with the contact member 12b. 7 is held in a horizontal state. Thus, when the switching device 12 holds the load receiving platform 7 in the horizontal state, the rotating member 12a and the contact member 12b are in contact with each other. Therefore, it is possible to prevent the tip portion 7b from being bent to the second base member 7a2 side.
Further, as shown in FIG. 6B, the switching device 12 releases the contact state of the rotating member 12a with the contact member 12b, whereby the second base member 7a2 is angled with respect to the first base member 7a1. The lowering of α is allowed, and the load receiving platform 7 is brought into a front lowering state. As shown in FIG. 7, the operation member 12 c is provided in the vehicle width direction on the bottom surface side of the load receiving platform 7, and simultaneously rotates the rotating members 12 a of the left and right switching devices 12.
[0018]
Further, as shown in FIG. 7, the load receiving base 7 is provided with a bending preventive device 13 on each of the left and right sides of the load receiving stand 7, and the load receiving stand 7 serves as a transfer plate. The front portion 7b is prevented from being bent toward the base portion 7a when in use.
With reference to FIGS. 7 to 9, the load receiving base bending preventing device 13 is rotated at positions away from the side surfaces of the second base member 7 a 2 and the front portion 7 b to the side. A restricting member 14 pivotally supported by the support member 14 and a rotating shaft 14a of the restricting member 14. And a spring 15. Further, the prevention device 13 is attached to the second base member 7a2 and the stopper 16 which is provided at the front portion 7b and restricts the rotation of the restriction member 14 in the expanding direction, and the front portion 7b is attached to the second portion 7b. A lock device 17 is provided for restricting the restricting member 14 from rotating in the folding direction with respect to the base member 7a2.
[0019]
The restriction member 14 is attached to a side portion of the second base member 7a2 via an attachment cover 18 shown in FIGS. 9 (a) and 9 (b). The mounting cover 18 is formed in a U-shaped cross section, and is attached to a step portion (not shown) provided on the upper surface and the bottom surface of the second base member 7a2. The mounting cover 18 is configured such that at least the upper surface 18a is flush with the upper surface of the second base member 7a2 when the mounting cover 18 is mounted on the second base member 7a2. As much as possible to prevent the movement work of luggage in the. The attachment cover 18 shown in FIG. 9 is attached to the left side portion of the load receiving platform 7, and is different from that attached to the right side portion of the load receiving platform shown in FIG. A notch 18b1 for fixing the mechanism 20 (FIG. 7) to the second base member 7a2 is formed on the bottom surface 18b (see FIG. 9B). As shown in FIG. 8B, the lock lever 19 engages with a fixing pin 21 provided at the tip of the tip 7b, thereby folding the tip 7b above the second base member 7a2. Is fixed to the second base member 7a2.
[0020]
As shown in FIG. 8A, the stopper 16 is attached to the side surface of the tip portion 7b so as not to protrude from the upper surface of the tip portion 7b. 15, one end of the regulating member 14 urged in the deploying direction is received. The stopper 16 and the restricting member 14 are configured such that the restricting member 14 rotates together with the front portion 7b when the front portion 7b is expanded or folded with respect to the second base member 7a2. The regulating member 14 pivots in the unfolding direction or the folding direction while maintaining the state where the one end side of the regulating member 14 slides in the recess of the stopper 16 and is received by the stopper 16 according to the pivoting operation. .
[0021]
As shown in FIG. 7, the locking device 17 includes a lock pin 17a having both end members 17a1 and 17a2 provided so as to be able to protrude from the left and right sides of the second base member 7a2, and both the left and right end members 17a1. , 17a2 and a control lever 17b that simultaneously locks or unlocks the pair of restricting members 14 provided on the left and right side portions of the load receiving platform 7 at the same time. 17a1 and 17a2 are inserted into engaging holes 14b provided on the other end side of the corresponding restricting member 14, whereby the lock device 17 restricts the rotation of the restricting member 14 in the folding direction. As a result, the hinge 7d can be prevented from lowering due to the weight of the load on the load receiving table 7 when the load receiving table 7 is in the front lowered state, and the front portion 7b is moved to the second base member 7a2 side. It is possible to prevent bending.
[0022]
More specifically, referring to FIGS. 10 (a) and 10 (b), the locking device 17 includes a rotating plate 17c connected to the operation lever 17b so as to be integrally rotatable, and about 180 degrees to the rotating plate 17c. Are provided with two swing links 17d and 17e attached at one end so as to be swingable with the phase difference of. The left and right end members 17a1 and 17a2 of the lock pin 17a are connected to the other ends of the swing links 17d and 17e, respectively. These both end members, for example, both end members 17a1, are slidably disposed in the guide hole of the guide member 17g fixed to the upper surface of the mounting cover 18 and the second base member 7a2 by the fixing pin 17f. By rotating the operating lever 18b by 90 degrees from the position indicated by the solid line (a) to the position indicated by the two-dot chain line in the figure, the both end members 17a1 project to the left side of the second base member 7a2. As a result, the both end members 17a pass through the engagement holes 14b of the restricting member 14, and restrict the rotation of the restricting member 14 in the folding direction.
[0023]
Here, the work procedure of the load receiving base bending prevention device 13 when the bridge mode using the load receiving stand 7 as a transfer plate is selected will be described.
The operator drives the load receiving platform lifting / lowering device 1 to bring the horizontal load receiving stand 7 to the lowest lowered position shown in FIG. 4, and then, as shown in FIG. 8B, the front portion 7b is moved to the second base member 7a2. Fold against. At this time, the regulating member 14 is rotated in the direction of folding together with the tip portion 7 b against the urging force of the spring 15. Subsequently, as shown in FIG. 3, the operator leans the second base member 7 a 2 and the tip portion 7 b against the guide roller 6 a provided at the tip of the slide cylinder 6, and then operates the operation member 12 c of the switching device 12. Is rotated to switch the rotation member 12a of the switching device 12 from the horizontal mode position (FIG. 6A) to the bridge mode position (FIG. 6B).
[0024]
Next, when the operator expands the front portion 7b with respect to the second base member 7a2 as shown in FIG. 8A, the restricting member 14 is expanded in the direction of expansion together with the front portion 7b by the biasing force of the spring 15. It is rotated. Then, as shown by the two-dot chain line in FIG. 10A, the operator rotates the operation lever 17b of the lock device 17 so that the both end members 17a1 and 17a2 of the lock pin 17a become the second base member 7a2. It protrudes from the right and left sides of the member and is inserted into the engagement hole 14b of the restricting member 14. Thereby, the locking device 17 restricts the rotation of the restriction member 14 in the folding direction, and the prevention device 13 prevents the front portion 7b from being bent toward the second base member 7a.
[0025]
In the load receiving base bending prevention device 13 of the present embodiment configured as described above, the regulating member 14 rotates at a position away from the side surfaces of the second base member 7a2 and the front portion 7b of the load receiving base 7 to the side. Therefore, even when the load receiving base 7 is lowered and used as a transfer plate, it is possible to prevent the load and the operator from coming into contact with the regulating member 14, and the load and unload operation can be performed without any trouble. it can. Further, when the front portion 7b is expanded or folded with respect to the second base member 7a2, the restricting member 14 can rotate together with the front portion 7b, so that the operator can move the restricting member 14 without moving the restricting member 14. The bending can be prevented or released, and the operation of the prevention device 13 can be performed quickly and easily, and the loading and unloading operation can be performed efficiently. In addition, when the load receiving platform 7 is in a horizontal state, the restricting member 14 is prevented from rotating in the folding direction by the urging force of the spring 15, and is further restricted from rotating in the unfolding direction by the stopper 16. Therefore, there is no need to provide a dedicated locking device that locks the regulating member 14 in this horizontal state. Further, since the posture of the regulating member 14 can be stabilized by the spring 15 and the stopper 16 when the regulating member 14 is engaged with and released from the lock pin 17a, the bending of the load receiving platform 7 is prevented. And the prevention cancellation can be performed smoothly.
[0026]
Further, in the present embodiment, the operation lever 17b of the lock device 17 can lock and unlock the pair of left and right restricting members 14 at the same time, so that the load receiving platform 7 can be prevented from being bent and prevented from being released. The work can be performed easily and quickly, and as a result, the work efficiency of the loading and unloading work can be improved.
[0027]
In the above description, the configuration in which the regulating member 14 is rotatably provided on the second base member 7a2 has been described. However, in the present invention, the rotary regulating member is provided at a predetermined interval from the side surface of the load receiving platform. What is necessary is just to be a thing, and you may provide the regulating member 14 in the front part 7b so that rotation is possible.
In the above description, the stopper 16 is provided in the front portion 7b, and the lock device 17 having the lock pin 17a is provided in the second base member 7a2. However, the stopper 16 and the lock device 17 are provided in the base portion 7a. The stopper 16 and the locking device 17 may be provided on the second base member 7a2 and the front part 7b, respectively, as long as they are provided on either one or the other of the front part 7b.
[0028]
In the above description, the configuration in which the engagement hole 14b is provided in the restriction member 14 and the lock pin 17a is inserted has been described. However, in the present invention, the lock device 17 restricts the rotation of the restriction member 14 in the folding direction. For example, the lock pin 17a may be protruded at a position below the restricting member 14 shown in FIG. 8A, and the rotation in the folding direction may be restricted.
Further, in the above description, the case where the present invention is applied to the load receiving table lifting apparatus 1 pulled out rearward of the vehicle body 50 has been described, but the present invention can be similarly applied to the load receiving table lifting apparatus pulled out sideways.
[0029]
Further, in the above description, the case where the present invention is applied to an underfloor retractable load receiving device lifting device has been described. However, the present invention is not limited to this, and a base and a tip that is foldably connected to the base. A load receiving platform that can be switched to either a horizontal state or a front lowering state by a switching device and that can be used as a loading plate as a loading / unloading route for a load. That's fine. Specifically, for example, the present invention can be applied to a stand-and-hold type load receiving table lifting device shown in FIG. Further, as shown in FIG. 12, there is a pair of left and right columns 32 erected at the rear end of the vehicle body, and a slider 33 that is disposed in the columns 32 and moves up and down in the vertical direction. The present invention can also be applied to a vertical lifting type load receiving table lifting device that vertically lifts the table 7.
[0030]
【The invention's effect】
The present invention configured as described above has the following effects.
According to the load receiving base bending prevention device of the load receiving stand lifting / lowering device according to claim 1, it is possible to prevent the load and the operator from coming into contact with the regulating member when the load receiving stand is used to load and unload the load. Therefore, the loading / unloading work can be performed without any trouble. In addition, unlike the above-described conventional example, the operator can prevent and release the bend of the load receiving table without moving the restricting member, so that the operation work of the prevention device can be performed quickly and easily. Can be efficiently carried out. In addition, it is not necessary to provide a dedicated locking device for locking the restricting member when the load receiving stand is in a horizontal state, and the number of parts can be suppressed, so that a cost-effective prevention device can be provided.
[0031]
Moreover, according to the load receiving stand bending prevention device of the load receiving stand lifting and lowering device according to claim 2, since the posture of the regulating member can be stabilized, the load receiving stand can be prevented from being bent and its prevention can be smoothly released. The burden on the operator can be further reduced.
[0032]
Further, according to the load receiving base bending prevention device of the load receiving base lifting device of claim 3, the switching operation between the prevention of the load receiving base bending and the release thereof can be easily and quickly performed. It is possible to carry out the loading and unloading work of the baggage to be used more quickly and more efficiently.
[Brief description of the drawings]
FIG. 1 is a side view of a rear part of a vehicle body to which a load receiving base bending prevention device of a load receiving base lifting device according to an embodiment of the present invention is applied.
FIG. 2 is a side view showing a state in which the load receiving table lifting device is pulled out rearward.
FIG. 3 is a side view showing a process of expanding (or folding) the load receiving table of the load receiving table lifting device.
FIG. 4 is a side view showing a state in which the load receiving table in a horizontal state is raised and lowered.
FIG. 5 is a side view showing a state in which the load receiving table in the forwardly lowered state is used as a transfer plate.
6 is an enlarged side view showing a configuration example of a main part of the switching device shown in FIG. 4, wherein (a) and (b) are the same when the load receiving platform is switched between a horizontal state and a front-lowering state, respectively. It is an enlarged side view of a switching device.
FIG. 7 is a bottom view of the load receiving stand in a state where a tip portion is developed with respect to a base portion.
FIGS. 8A and 8B are side views of the load receiving stand in a state in which a front portion is expanded with respect to a base portion and a folded state, respectively.
9 is an enlarged view showing the regulating member shown in FIG. 8 and a spring (elastic member) for urging the regulating member, and (a) and (b) are an enlarged side view and an enlarged bottom view, respectively.
10A and 10B are an enlarged structural view and an enlarged cross-sectional view showing a configuration example of the locking device shown in FIG. 7, respectively.
FIG. 11 is a side view of a rear part of a vehicle body to which a load receiving base bending prevention device of a load receiving base lifting device according to another embodiment is applied.
FIG. 12 is a side view of the rear part of the vehicle body to which the load receiving base bending prevention device of the load receiving base lifting device according to another embodiment is applied.
FIGS. 13A and 13B are side views showing the structure of a main part of a conventional load receiving table bending apparatus, and FIGS. 13A and 13B show a state before and after moving a regulating member of the apparatus, respectively. It is a side view.
[Explanation of symbols]
1 Loading platform lifting device
7 Receiving platform
7a base
7a1 first base member
7a2 Second base member
7b tip
12 Switching device
13 Folding stand bending prevention device
14 Regulatory members
15 Spring (elastic member)
16 Stopper
17 Locking device
17a Lock pin
17a1, 17a2 Both end members (both ends)
17b Operation lever

Claims

Either a load receiving platform having a base and a front portion that is foldably connected to the base, and a whole or a part of the load receiving platform in a horizontal state or a front lowered state in which the front side is inclined downward from the horizontal state And a switching device that selectively switches to such a state, and raises and lowers the load receiving table, expands the front portion with respect to the base, and further switches to the front lowering state by the switching device and passes the load receiving table. It is used for a load receiving table lifting device that can be used as a plate, and is a load receiving table bending preventing device that prevents the front portion from being bent to the base side when the load receiving table is used as a transfer plate,
A pair of right and left restricting members provided at predetermined intervals from the left and right side surfaces of the load receiving table, and pivotally supported by the base or the front portion of the load receiving table;
A stopper provided on one of the base and the tip and receiving the regulating member;
It has a lock pin provided so that it can project to the other side of the base and the tip, and this lock pin engages with the restricting member received by the stopper, so that the tip becomes the base A load receiving base bending prevention apparatus for a load receiving base lifting apparatus, comprising: a lock device that restricts rotation of the restricting member in a direction in which the restricting member is folded.

The load receiving base bending prevention device for a load receiving stand lifting / lowering device according to claim 1, further comprising an elastic member that urges the restricting member in a direction in which the tip portion is expanded with respect to the base portion.

3. The operation device according to claim 1, wherein the lock device includes an operation lever that simultaneously moves both left and right ends of the lock pin to simultaneously lock or unlock the pair of left and right regulating members. The load receiving device bending prevention device of the load receiving device lifting device.