JP4125544B2 - Cargo cradle lifting device - Google Patents

Cargo cradle lifting device Download PDF

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Publication number
JP4125544B2
JP4125544B2 JP2002152355A JP2002152355A JP4125544B2 JP 4125544 B2 JP4125544 B2 JP 4125544B2 JP 2002152355 A JP2002152355 A JP 2002152355A JP 2002152355 A JP2002152355 A JP 2002152355A JP 4125544 B2 JP4125544 B2 JP 4125544B2
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slider
inner column
column
pair
receiving platform
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JP2003341411A (en
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匡市 定本
哲之 安楽
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Kyokuto Kaihatsu Kogyo Co Ltd
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Kyokuto Kaihatsu Kogyo Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、貨物自動車などに貨物車両の荷箱に設けられる、荷受台昇降装置に関するものである。
【0002】
【従来の技術】
従来、荷箱の荷物出入口に、一対のアウタコラムを略鉛直に固定し、そのアウタコラムにインナコラムを昇降可能に嵌挿し、さらにそのインナコラムに、荷受台を張出、格納可能に設けたスライダを嵌挿し、スライダの昇降駆動により、スライダとインナコラムとを共に昇降作動して荷受台を地上と荷箱間に昇降作動してそれらの間で荷物の積み降ろしを行なうようにした、荷受台の昇降装置は公知である(たとえば、特開平9−22641号公報、特開平8−230548号公報参照)。
【0003】
【発明が解決しようとする課題】
ところで、かかる荷受台昇降装置において、荷受台が下降する際には、インナコラムと荷受台を設けたスライダとを、アウタコラムに沿って一体に地上近くまで下降させ、インナコラムの接地後に、荷受台を円滑、緩徐に接地させて荷役作業の安全性を向上させることが望ましい。
【0004】
ところが、前記荷役作業において、
(1)貨物車両を、傾斜地や不整地に停車したとき、シヤシフレームやアウタコラムに発生する多少のねじれ、
(2)アウタコラムとインナコラムの加工精度の誤差や組立誤差、
(3)荷受台上に左右方向に偏って荷物が載置されたときに、スライダやインナコラムに発生するねじれ、
(4)アウタコラムとインナコラム間に、ごみ、砂などの異物の混入、
などに起因して、インナコラムおよび荷受台を設けたスライダの下降動作時に、インナコラムに下降抵抗が生じてその下降が一時的に停止する一方、荷受台と一体のスライダのみが先行して下降し、その後、前記下降動作の継続中に、インナコラムの前記下降抵抗が解除されると、該インナコラムがいっきに下降して、インナコラムおよびスライダの下降動作が不安定となり、荷役作業の安全性、円滑性がが多少とも損なわれるという問題がある。
【0005】
本発明はかかる実情に鑑みてなされたもので、荷受台昇降装置、特にそのインナコラムの不安定な動作をなくして、前記問題を解決した、新規な貨物車両の荷受台昇降装置を提供することを目的とするものである。
【0006】
【課題を解決するための手段】
上記目的を達成するために、請求項1記載の発明は、荷箱に略鉛直に固定される一対のアウタコラムと、該アウタコラムに昇降可能に嵌挿されるインナコラムと、該インナコラムに昇降可能に設けられるスライダと、このスライダに、張出、格納可能に支持される荷受台と、前記スライダに連結され該スライダを前記インナコラムに沿って昇降駆動する駆動装置とを備え、前記駆動装置の非作動時には、前記インナコラムおよびスライダが自重により共に下降して前記荷受台が地上に設置され、また前記駆動装置の作動時には、前記駆動装置がスライダを上昇させるのに伴ってインナコラム共に上昇、荷受台を、その荷受面が荷箱の床面と略面一となるまで上昇させるようにした、貨物車両の荷受台昇降装置において、前記スライダと、前記インナコラムとの間には、それら間に所定の摩擦力を保持するための摩擦力保持手段を設け、スライダの下降時におけるインナコラムの落下を防止したことを特徴としており、かかる特徴によれば、荷受台の下降動作中、インナコラムと荷受台を設けたスライダとを、インナコラムが接地するまでの間、常に一体となって下降させることができ、前記インナコラムの不安定な下降動作をなくして、インナコラムとスライダの所期の下降動作を保障することができ、荷役作業の安全性、円滑性を向上することができる。
【0007】
また、上記目的を達成するために、請求項2記載の発明は、前記請求項1記載のものにおいて、前記摩擦力保持手段は、スライダに設けた一対のパッドと、それらのパッドをインナコラムの内壁面に向けてそれぞれ弾発付勢する弾性部材とよりなることを特徴としており、かかる特徴によれば、前記請求項1記載の発明と同等の効果を奏する上に、スライダとインナコラム間にはその両側に均等に摩擦力を付与することができて、それらの一体作動を一層確実、軽快に行なうことができる。
【0008】
さらに、上記目的を達成するために、請求項3記載の発明は、前記請求項2記載のものにおいて、前記一対のパッドの、前記インナコラムの内壁面と接する外面には、グリスを充填したグリス溝が形成されていることを特徴としており、かかる特徴によれば、前記請求項2記載の発明と同等の効果を奏する上に、インナコラムとスライダ間に所定の摩擦抵抗を保持させながら、それらの円滑、軽快な相対移動を保障することができる。
【0009】
【発明の実施の形態】
本発明の実施の形態を、添付図面に例示した本発明の実施例に基づいて以下に具体的に説明する。
【0010】
この実施例は、本発明荷受台昇降装置を、貨物自動車に実施した場合であり、図1は、本発明荷受台昇降装置の荷受台が最下降した状態を示す貨物自動車の後部斜視図、図2は、図1の2−2線に沿う本発明荷受台昇降装置の荷受台が最下降した状態を示す貨物自動車の後部側面図、図3は、本発明荷受台昇降装置の荷受台が最上昇した状態を示す貨物自動車の後部側面図、図4は、図3の4−4線に沿う拡大横断面図、図5は、図3の5−5線に沿う拡大横断面図、図6は、図3の6線矢視の仮想線囲い部分の拡大図、図7は、図6の7−7線に沿う縦断面図、図8は、図6の8−8線に沿う拡大横断面図、図9は、図8の9−9線に沿う部分断面図、図10は、荷受台の下降行程を示す図、図11は、荷受台の上昇行程を示す図である。
【0011】
図1〜3において、貨物自動車の荷箱Vの出入口を有する後端には、本発明にかかる荷受台昇降装置(テールゲートリフター)が設けられ、該装置により地上と荷箱Vの床面間で略水平状態に保持される荷受台1が昇降作動され、該荷受台1上に載置される荷物を地上と荷箱V間で積み降ろしすることができる。
【0012】
前記荷箱Vの後端両側には、略鉛直方向に延びる左右一対のアウタコラム2,2が固定される。各アウタコラム2は中空の角筒体よりなり、その開口上端に天板2aがを固定され、またアウタコラム2内中央部には、中間板2bが一体に設けられる。アウタコラム2,2の後壁には、後述するスライダ14を昇降案内するための縦スリット4が開口されている。また、各アウタコラム2の下端には、後述のインナコラム3の昇降作動を案内するための、一対の案内ローラ5が回転自在に軸支され、さらに、アウタコラム2,2の上端には、後述するワイヤロープ32,33をそれぞれ案内するための案内滑車6,6が回転自在に軸支され、さらにアウタコラム2,2の下端に、インナコラム3の下端が当接するストッパ10,10が固定されている。
【0013】
一対のアウタコラム2,2には、一対のインナコラム3,3がそれぞれ昇降自在に嵌挿される。各インナコラム3も中空の角筒体により構成され、その後壁には、前記アウタコラム2の縦スリット4と一致するように他の縦スリット7が開口される。図2,3に示すように、各インナコラム3の上端には、ブラケット9を介して一対の案内ローラ8,8が回転自在に軸支され、これらの案内ローラ8,8は、インナコラム3,3の昇降作動時に、アウタコラム2,2の後壁内面を転動してインナコラム3,3の昇降を案内する。
【0014】
また、図6に示すように、各インナコラム3の下端には、ブラケット11を介して弾性のストッパ12が取り付けられ、このストッパ12は、アウタコラム2の下端のストッパ10に当接してインナコラム3の最上昇位置を規制し、また、インナコラム3の下部を補強してその変形を防止する。また、インナコラム3,3の最上昇位置では、その上端と、アウタコラム2,2の天板2a,2aとの間に隙間を形成してアウタコラム2,2と衝突しないようにされているとともに荷受台1の上昇時に、その荷受面1aと、荷箱Vの床面とを面一に調整し易いようにしている。
【0015】
一対のインナコラム3,3には、スライダ14,14がそれぞれ昇降自在に挿入されており、それらのスライダ14,14の後縁は、前記インナコラム3,3およびアウタコラム2,2に形成した縦スリット4,4;7,7をそれぞれ貫通してそれらの後方に延出しており、それらの縦スリット4,4;7,7に案内されてアウタコラム2,2およびインナコラム3,3に対して昇降可能である。そして、各スライダ14は、その最上昇時に、インナコラム3の上半部に収まるような長さに形成されている(図3参照)。
【0016】
図6,7に示すように、スライダ14,14の上、下部には、それぞれ対をなす上、下案内ローラ15,16が回転自在に軸支され、これらの案内ローラ15,16は、該スライダ14,14がインナコラム3,3に対して昇降するとき、インナコラム3,3の内面を転動する。また、各スライダ14の上縁には、ストッパゴム17が設けられ、このストッパゴム17は、インナコラム3上端のベースプレート3aと係合してスライダ14の上昇位置を規制する。一対のスライダ14,14の外面下端には、ブラケット18,18がそれぞれ固定され、これらのブラケット18,18に、前記荷受台1が略水平な張出位置と、略鉛直な格納位置間を回動できるように軸支19,19されている。また、各スライダ14の下端に固定したステー21には、荷受台1の基端と係合して、これを張出位置に係止するためのストッパボルト22が上下位置を調節できるように取り付けられている。
【0017】
図6〜9に示すように、一対のスライダ14,14の上下方向の中間部、すなわち前記上、下案内ローラ15,16の間には、本発明にかかる摩擦力保持手段F,Fがそれぞれ設けられる。この摩擦力保持手段F,Fは、スライダ14,14とインナコラム3,3との間に所定の摩擦抵抗を付与してスライダ14,14が下降するとき、スライダ14,14とインナコラム3,3とが所定の摩擦力をもって一体となって的確、円滑に下降できるようにするためのものであり、以下に、この摩擦力保持手段Fの構造について説明するに、これは、図8,9に明瞭に示すように、ポリアミド樹脂よりなる一対の摩擦パッド24,24と、これらの摩擦パッド24,24を互いに外側に附勢する弾性部材としてのコイルスプリング25とより構成される。
【0018】
各スライダ14の上下方向の中間部には、取付孔26が開口され、この取付孔26にパイプ部材27が一体に横架され、このパイプ部材27内に弾性部材としての前記コイルスプリング25が内装され、該コイルスプリング25の両端に一対の前記摩擦パッド24,24が外側に向けて弾発附勢されている。図8,9に示すように、一対の摩擦パッド24,24は、それぞれ円盤状に形成され、その内面に凹設した環状の凹所24a,24aに前記コイルスプリング25の両端がそれぞれ係合されている。一対の摩擦パッド24,24の外面にはそれぞれグリース溝24b,24bが形成されている。各グリース溝24bは、図9に明瞭に示すように、摩擦パッド24の中心を中心とする環状溝24cと、その環状溝24cより外方に延びる複数の放射溝24dとより構成され、それらの放射溝24dの底壁は、その内端より外端に向かって上り坂の傾斜面24eに形成されている。そして、環状溝24cと複数の放射溝24dよりなるグリース溝24bには、グリースGが充填される。
【0019】
なお、前記一対の摩擦パッド24,24は、ポリアミド樹脂の外、他の樹脂、金属などにより形成してもよい。
【0020】
図7,8に示すように、スライダ14,14が、インナコラム3,3内にそれぞれ昇降自在に嵌挿されるとき、摩擦保持部材F,Fの各一対の摩擦パッド2424は、それらのグリース溝24bを有する外面が、前記コイルスプリング25の弾発力により、インナコラム3,3の相対向する内壁面に圧接され、スライダ14,14とインナコラム3,3間に所定の摩擦抵抗を付与して、後に述べるように、スライダ14,14とインナコラム3,3とが下降するとき、スライダ14,14とインナコラム3,3は一体となって下降し、インナコラム3,3がスライダ14,14に対して急激に落下することがないようになっており、さらに、インナコラム3,3が接地して、スライダ14,14がインナコラム3,3に対して下降するとき、その下降が円滑に行なわれるようになっている。
【0021】
図1に示すように、一対のスライダ14,14は貨物自動車の荷箱V下部のシヤシフレームSに設けられる駆動装置30に連結される。荷箱V下のシヤシフレームSには、駆動装置としての油圧シリンダ30が横向きに配設され、この油圧シリンダ30のピストンロッド30a先端には、一対の動滑車31,31が回転自在に軸支され、シヤシフレームSに一端を結着された2条のワイヤロープ32、33は、前記一対の動滑車31,31にそれぞれ懸回され、さらにシヤシフレームSにそれぞれ軸支した滑車34,35あるいは滑車36を経由したのち、上方に延びて、アウタコラム2上端の、前記案内滑車6,6を経由して、その他端がスライダ14,14にそれぞれ結着されている。したがって、前記油圧シリンダ30を伸縮作動すれば、2条にワイヤロープ32,33を介して一対のスライダ14,14が昇降作動され、これに連結される荷受台1を昇降作動することができる。
【0022】
つぎに、この実施例の作用について説明すると、貨物自動車が走行姿勢にあるときは、荷受台昇降装置は、上昇位置に保持される。すなわち一対のスライダ14,14は、駆動装置としての油圧シリンダ30の伸長により最上昇位置に牽引され、該スライダ14とそれぞれ係合するインナコラム3も最上昇位置に保持され、その下端のストッパ12,12は、アウタコラム2,2下端のストッパ10,10にそれぞれ衝合される。そして上昇位置にある荷受台1は、図3鎖線に示すように、格納位置に起立回動し、図示しない係止機構により係止される。
【0023】
つぎに、荷受台昇降装置を昇降作動して荷受作業を行なう場合について説明する。
【0024】
(1)荷受台の下降行程(図10参照)
荷受台1が最上昇位置に保持された状態で、該荷受台1を格納位置より張出位置〔図10(a)〕に回動させた後、油圧シリンダ30を収縮作動すれば、2条のワイヤロープ32,33は繰り出されて一対の、スライダ14とインナコラム3は、それらの自重により一体となってアウタコラム2内を下降する。そして、インナコラム3の下端が地上に接地すると〔図10(b)〕、今度はスライダ14のみが、インナコラム3内を下降して荷受台1が地上に接地して停止し、荷受台1は下降位置に保持される〔図10(c)〕。
【0025】
ところで、この実施例では、スライダ14とインナコラム3との間に、一対の摩擦パッド24,24とコイルスプリング25とよりなる摩擦力保持手段Fが設けられていることにより、各スライダ14とインナコラム3間に所定の摩擦抵抗が作用しているので、前述のスライダ14とインナコラム3との自重による同時下降中において、前記(1)(4)などの理由により、インナコラム3に下降抵抗が発生しても、該インナコラム3を置いてきぼりにしてスライダ14のみが先行して下降し、その後に前記下降抵抗の解除によりインナコラム3が一気に下降することを防止し、これにより、荷受台1の下降を安全に、かつ円滑軽快に行なうことができる。
【0026】
(2)荷受台の上昇行程(図11参照)
インナコラム3およびスライダ14と一体の荷受台1が共に接地された荷物の積み降ろし位置〔図11(a)〕で、地上と荷受台1の荷受面1a間で荷物の受け渡し作業を行なったのち、駆動装置としての油圧シリンダ30を伸長作動すれば、2条のワイヤロープ32,33が牽引される。このとき、スライダ14とインナコラム3は、前記摩擦力保持手段Fによるそれら間の摩擦力により、一体となって上昇し〔図11(b)〕、インナコラム3の下端のストッパ12が、アウタコラム2の下端のストッパ10に当接するに至れば、スライダ14のみが、インナコラム3およびアウタコラム2内を最上昇位置まで上昇して、荷受台1の荷受面1aが、荷箱Vの床面と面一に保持され〔図11(c)〕、荷受台1と荷箱V間での荷物の受け渡しを行なう。
【0027】
荷役作業の終了後は、荷受台1を軸支19点まわりに上方に回動、格納(図3鎖線位置)して、貨物自動車は、走行姿勢に保たれる。
【0028】
ところで、前記(1)の荷受台1の下降行程において、前記摩擦力保持手段Fのない従来のものでは、
(1)不整地でのシヤシフレームSやアウタコラム2のねじれの発生、
(2)荷受台1に左右不均衡な荷物を載せた場合のスライダ14やインナコラム3のねじれの発生、
(3)アウタコラム2とインナコラム3間に、ごみ、砂、小石などの混入、
(4)アウタコラム2、インナコラム3の加工、組立精度不良、
等の起因して、インナコラム3がアウタコラムに対して局部的に強く係合することがあり、これにより、インナコラム3とアウタコラム2との間に大なる摩擦抵抗が生じ、インナコラム3に予期せぬ下降抵抗が発生して、その後にインナコラム3の下降抵抗の解除で、インナコラム3が一気に落下するという事態を招くことがあるが、この実施例では、前述したように、前記摩擦力保持手段F、すなわち一対のパッド24,24とコイルスプリング25により、スライダ14とインナコラム3間には、常に所定の摩擦力が積極的に与えられることにより、それらの一体的な下降を保障して、スライダ14のみがインナコラムに先行して下降することが防止され、前記事態の発生を未然に防止することができる。
【0029】
また、摩擦力保持手段Fを構成する一対の摩擦パッド24は、その外面、すなわちインナコラム3の内壁面との圧接面にグリース溝24bが形成され、そこにグリースGが充填されることにより、スライダ14とインナコラム間には、所定の摩擦抵抗を与えながらそれらの相対的な移動を支障なく円滑に行なうことができる。
【0030】
以上、本発明の一実施例について説明したが、本発明はその実施例に限定されることなく、本発明の範囲内で種々の実施例が可能である。
【0031】
たとえば、前記実施例では、本発明貨物車両の荷受台昇降装置を、貨物自動車の後部荷受台昇降装置(テールゲートリフター)に実施した場合を説明したが、これを、貨物自動車の側部荷受台昇降装置(サイドゲートリフター)、他の車両の荷受台昇降装置にも実施可能である。また、摩擦パッドおよび弾性部をインナコラムに設け、前記摩擦パッドをスライダの側面に弾発附勢するようにしてもよい。
【0032】
【発明の効果】
以上のように、請求項1記載の発明によれば、貨物車両の荷受台昇降装置において、前記スライダと、前記インナコラムとの間には、それら間に所定の摩擦力を保持するための摩擦力保持手段を設け、スライダ)の下降時におけるインナコラムの落下を防止したので、荷受台の下降動作中、インナコラムと荷受台を設けたスライダとを、インナコラムが接地するまでの間、常に一体となって下降させることができ、前記インナコラムの不安定な下降動作をなくして、インナコラムとスライダの所期の下降動作を保障することができ、荷役作業の安全性、円滑性を向上することができる。
【0033】
また、請求項2記載の発明によれば、前記請求項1記載のものにおいて、前記摩擦力保持手段は、スライダに設けた一対のパッドと、それらのパッドをインナコラムの内壁面に向けてそれぞれ弾発付勢する弾性部材とよりなるので、前記請求項1記載の発明と同等の効果を奏する上に、スライダとインナコラム間にはその両側に均等に摩擦力を付与することができて、それらの一体作動を一層確実、軽快に行なうことができる。
【0034】
さらに、請求項3記載の発明によれば、前記請求項2記載のものにおいて、前記一対のパッドの、前記インナコラムの内壁面と接する外面には、グリスを充填したグリス溝が形成されるので、前記請求項2記載の発明と同等の効果を奏する上に、インナコラムとスライダ間に所定の摩擦抵抗を保持させながら、それらの円滑、軽快な相対移動を保障することができる。
【図面の簡単な説明】
【図1】 荷受台昇降装置の荷受台が下降した状態を示す貨物自動車の後部斜視図
【図2】 図1の2−2線に沿う荷受台昇降装置の荷受台が最下降した状態を示す貨物自動車の後部側面図
【図3】 荷受台昇降装置の荷受台が最上昇した状態を示す貨物自動車の後部側面図
【図4】 図3の4−4線に沿う拡大横断面図
【図5】 図3の5−5線に沿う拡大横断面図
【図6】 図2の6線矢視の仮想線囲い部分の拡大図
【図7】 図6の7−7線に沿う縦断面図
【図8】 図6の8−8線に沿う拡大横断面図
【図9】 図8の9−9線に沿う部分断面図
【図10】 荷受台の下降行程を示す図
【図11】 荷受台の上昇行程を示す図
【符号の説明】
1・・・・・・・・・荷受台
1a・・・・・・・・荷受面
2・・・・・・・・・アウタコラム
3・・・・・・・・・インナコラム
14・・・・・・・・スライダ
24・・・・・・・・摩擦パッド
24b・・・・・・・グリース溝
25・・・・・・・・弾性部材(コイルスプリング)
30・・・・・・・・駆動装置(油圧シリンダ)
F・・・・・・・・・摩擦力保持手段
G・・・・・・・・・グリース溝
V・・・・・・・・・荷箱
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load receiving table lifting device provided in a cargo box of a cargo vehicle in a truck or the like.
[0002]
[Prior art]
Conventionally, a pair of outer columns are fixed substantially vertically at the cargo doorway of the packing box, and the inner column is fitted into the outer column so that it can be moved up and down, and a load receiving stand is provided on the inner column so that it can be extended and stored. A slider is inserted and the slider is driven up and down to raise and lower both the slider and the inner column to raise and lower the load receiving platform between the ground and the cargo box to load and unload the cargo between them. the platform of the lifting device is known (e.g., JP-a 9-2264 4 1 JP, see Japanese Patent Laid-Open No. 8-230548).
[0003]
[Problems to be solved by the invention]
By the way, in such a load receiving table elevating device, when the load receiving table is lowered, the inner column and the slider provided with the load receiving table are lowered integrally along the outer column to near the ground, and after receiving the inner column, It is desirable to improve the safety of cargo handling work by grounding the table smoothly and slowly.
[0004]
However, in the cargo handling work,
(1) When the freight vehicle stops on sloping or rough terrain, some twisting occurs in the coconut frame or outer column,
(2) Outer column and inner column machining accuracy errors and assembly errors,
(3) Twist that occurs in the slider and inner column when the load is placed on the load receiving platform in the left-right direction,
(4) Foreign matter such as dust and sand is mixed between the outer column and the inner column.
For example, when the slider provided with the inner column and the load receiving table is lowered, a lowering resistance is generated in the inner column and the lowering temporarily stops, while only the slider integrated with the load receiving table is lowered in advance. Then, if the lowering resistance of the inner column is released while the lowering operation is continued, the inner column is lowered at once, and the lowering operation of the inner column and the slider becomes unstable, and the safety of the cargo handling work There is a problem that the smoothness is somewhat impaired.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a cargo carrier lifting device for a freight vehicle that eliminates the unstable operation of the cargo receiving device, particularly the inner column thereof, and solves the above problems. It is intended.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a pair of outer columns fixed substantially vertically to a packing box, an inner column that is inserted into the outer column so as to be movable up and down, and an elevator column that moves up and down. A slider provided so as to be capable of being supported, a load receiving base supported to be able to project and retract on the slider, and a drive device connected to the slider and driving the slider up and down along the inner column. When the motor is not operated, the inner column and the slider are both lowered by their own weight and the load receiving platform is installed on the ground. When the driving device is operated, both the inner column and the inner column are moved as the driving device raises the slider. elevated, the receiving platform, the receiving surface has to be raised to the floor surface substantially flush of packing box, in the receiving platform lifting device of goods vehicles, and the slider, Between the serial inner column, the frictional force holding means for holding a predetermined frictional force between them provided, which is characterized in that to prevent dropping of the inner column during the descent of the slider, to the feature According to the above, during the lowering operation of the load receiving table, the inner column and the slider provided with the load receiving table can always be lowered integrally until the inner column is grounded, and the inner column is lowered unstablely. By eliminating the operation, the intended lowering operation of the inner column and the slider can be ensured, and the safety and smoothness of the cargo handling work can be improved.
[0007]
In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the frictional force holding means includes a pair of pads provided on the slider, and the pads connected to the inner column. It is characterized by comprising an elastic member that is elastically biased toward the inner wall surface. According to this feature, the same effect as that of the invention of claim 1 can be obtained, and the slider and the inner column can be provided. Can equally apply frictional force to both sides thereof, and can perform the integrated operation more reliably and lightly.
[0008]
Furthermore, in order to achieve the above object, the invention according to claim 3 is the one according to claim 2, in which the outer surfaces of the pair of pads contacting the inner wall surface of the inner column are filled with grease. According to this feature, the same effect as that of the invention of claim 2 can be obtained, and a predetermined frictional resistance can be maintained between the inner column and the slider while maintaining the predetermined frictional resistance. Smooth and light relative movement can be ensured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.
[0010]
This embodiment is a case in which the cargo receiving platform lifting apparatus of the present invention is applied to a cargo vehicle, and FIG. 1 is a rear perspective view of the cargo vehicle showing a state where the cargo receiving platform of the present invention cargo receiving platform lifting apparatus is lowered. FIG. 2 is a rear side view of the rear part of the lorry showing the state in which the load receiving platform of the load receiving platform lifting apparatus according to the present invention along the line 2-2 in FIG. 1 is lowered, and FIG. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG. 3, and FIG. Is an enlarged view of a virtual line encircled portion taken along line 6 in FIG. 3, FIG. 7 is a longitudinal sectional view taken along line 7-7 in FIG. 6, and FIG. 8 is an enlarged cross section taken along line 8-8 in FIG. FIG. 9 is a partial cross-sectional view taken along line 9-9 of FIG. 8, FIG. 10 is a diagram showing a descending process of the load receiving table, and FIG. 11 is a diagram showing an ascending process of the receiving table.
[0011]
1 to 3, the rear end of the lorry with the entrance / exit of the cargo box V is provided with a load receiving table lifting / lowering device (tailgate lifter) according to the present invention. Thus, the load receiving platform 1 held in a substantially horizontal state is moved up and down, and the load placed on the load receiving platform 1 can be loaded and unloaded between the ground and the packing box V.
[0012]
A pair of left and right outer columns 2, 2 extending in a substantially vertical direction are fixed to both sides of the rear end of the packing box V. Each outer column 2 is formed of a hollow rectangular tube. A top plate 2a is fixed to the upper end of the opening, and an intermediate plate 2b is integrally provided at the center of the outer column 2. In the rear walls of the outer columns 2, 2, a vertical slit 4 for opening and lowering a slider 14 described later is opened. In addition, a pair of guide rollers 5 for guiding the raising / lowering operation of the inner column 3 described later is rotatably supported at the lower end of each outer column 2, and the upper ends of the outer columns 2, 2 are Guide pulleys 6 and 6 for guiding wire ropes 32 and 33, which will be described later, are rotatably supported, and stoppers 10 and 10 with which the lower ends of the inner columns 3 abut are fixed to the lower ends of the outer columns 2 and 2, respectively. Has been.
[0013]
A pair of inner columns 3 and 3 are respectively inserted into the pair of outer columns 2 and 2 so as to be movable up and down. Each inner column 3 is also constituted by a hollow rectangular cylinder, and another vertical slit 7 is opened on the rear wall so as to coincide with the vertical slit 4 of the outer column 2. As shown in FIGS. 2 and 3, a pair of guide rollers 8, 8 are rotatably supported at the upper end of each inner column 3 via a bracket 9, and these guide rollers 8, 8 are connected to the inner column 3. , 3, the inner columns 3, 3 are guided to move up and down by rolling on the inner surfaces of the rear walls of the outer columns 2, 2.
[0014]
As shown in FIG. 6, an elastic stopper 12 is attached to the lower end of each inner column 3 via a bracket 11, and this stopper 12 abuts against the stopper 10 at the lower end of the outer column 2 to contact the inner column. 3 is restricted, and the lower part of the inner column 3 is reinforced to prevent its deformation. Further, a gap is formed between the upper end of the inner columns 3 and 3 and the top plates 2a and 2a of the outer columns 2 and 2 so as not to collide with the outer columns 2 and 2. At the same time, when the load receiving platform 1 is raised, the load receiving surface 1a and the floor surface of the packing box V are easily adjusted to be flush with each other.
[0015]
Sliders 14 and 14 are inserted into the pair of inner columns 3 and 3 so as to be movable up and down. The rear edges of the sliders 14 and 14 are formed in the inner columns 3 and 3 and the outer columns 2 and 2, respectively. The longitudinal slits 4, 4; 7, 7 pass through the longitudinal slits 4, 4, 7, and 7, respectively, and are guided by the longitudinal slits 4, 4; 7, 7. It can move up and down. Each slider 14 is formed to have a length that can be accommodated in the upper half of the inner column 3 when the slider 14 is at its highest position (see FIG. 3).
[0016]
As shown in FIGS. 6 and 7, a pair of upper and lower guide rollers 15 and 16 are pivotally supported on the upper and lower portions of the sliders 14 and 14, respectively. The guide rollers 15 and 16 are rotatably supported. When the sliders 14 and 14 move up and down with respect to the inner columns 3 and 3, the inner surfaces of the inner columns 3 and 3 roll. A stopper rubber 17 is provided on the upper edge of each slider 14, and this stopper rubber 17 engages with the base plate 3 a at the upper end of the inner column 3 to restrict the ascending position of the slider 14. Brackets 18 and 18 are fixed to the lower ends of the outer surfaces of the pair of sliders 14 and 14, respectively. The brackets 18 and 18 rotate the load receiving platform 1 between a substantially horizontal protruding position and a substantially vertical storage position. The shafts 19 are supported so that they can move. Also, the stay 21 fixed to the lower end of each slider 14 is attached so that a stopper bolt 22 for engaging with the base end of the load receiving platform 1 and locking it to the extended position can be adjusted in the vertical position. It has been.
[0017]
As shown in FIGS. 6 to 9, the frictional force holding means F and F according to the present invention are respectively provided between the upper and lower guide rollers 15 and 16 between the pair of sliders 14 and 14 in the vertical direction. Provided. The frictional force holding means F, F give a predetermined frictional resistance between the sliders 14, 14 and the inner columns 3, 3, and when the sliders 14, 14 descend, the sliders 14, 14, and the inner columns 3, 3 3 and 3 so that they can be accurately and smoothly lowered together with a predetermined frictional force. The structure of the frictional force retaining means F will be described below with reference to FIGS. As clearly shown in FIG. 2, the pair of friction pads 24 and 24 made of polyamide resin and a coil spring 25 as an elastic member for biasing the friction pads 24 and 24 outward are formed.
[0018]
A mounting hole 26 is opened in the middle portion of each slider 14 in the vertical direction, and a pipe member 27 is integrally mounted in the mounting hole 26, and the coil spring 25 as an elastic member is provided inside the pipe member 27. The pair of friction pads 24 and 24 are elastically urged toward the outside at both ends of the coil spring 25. As shown in FIGS. 8 and 9, the pair of friction pads 24, 24 are each formed in a disk shape, and both ends of the coil spring 25 are engaged with annular recesses 24a, 24a provided in the inner surface thereof. ing. Grease grooves 24b and 24b are formed on the outer surfaces of the pair of friction pads 24 and 24, respectively. As clearly shown in FIG. 9, each grease groove 24b includes an annular groove 24c centered on the center of the friction pad 24 and a plurality of radial grooves 24d extending outward from the annular groove 24c. The bottom wall of the radiating groove 24d is formed on an inclined surface 24e that is uphill from the inner end toward the outer end. The grease groove 24b including the annular groove 24c and the plurality of radiation grooves 24d is filled with grease G.
[0019]
The pair of friction pads 24, 24 may be formed of other resin, metal or the like in addition to the polyamide resin.
[0020]
As shown in FIGS. 7 and 8, when the sliders 14 and 14 are inserted into the inner columns 3 and 3 so as to be movable up and down, the pair of friction pads 2424 of the friction holding members F and F have their grease grooves. The outer surface having 24 b is pressed against the opposing inner wall surfaces of the inner columns 3, 3 by the elastic force of the coil spring 25, and gives a predetermined friction resistance between the sliders 14, 14 and the inner columns 3, 3. As will be described later, when the sliders 14 and 14 and the inner columns 3 and 3 are lowered, the sliders 14 and 14 and the inner columns 3 and 3 are integrally lowered, and the inner columns 3 and 3 are moved to the sliders 14 and 14. 14 when the inner columns 3 and 3 are grounded and the sliders 14 and 14 are lowered with respect to the inner columns 3 and 3. Descent is adapted to be carried out smoothly of.
[0021]
As shown in FIG. 1, the pair of sliders 14, 14 are connected to a driving device 30 provided on a palm frame S below a cargo box V of a truck. A hydraulic cylinder 30 serving as a driving device is disposed laterally on the palm frame S below the cargo box V, and a pair of movable pulleys 31 and 31 are rotatably provided at the tip of the piston rod 30a of the hydraulic cylinder 30. The two wire ropes 32 and 33 supported on one end of the palm frame S are suspended by the pair of movable pulleys 31 and 31, respectively, and the pulleys 34 are pivotally supported on the palm frame S. , 35 or the pulley 36, and then extends upward, and the other end of the outer column 2 is connected to the sliders 14 and 14 via the guide pulleys 6 and 6, respectively. Therefore, if the hydraulic cylinder 30 is expanded and contracted, the pair of sliders 14 and 14 are moved up and down via the wire ropes 32 and 33, and the load receiving platform 1 connected thereto can be moved up and down.
[0022]
Next, the operation of this embodiment will be described. When the lorry is in a traveling posture, the load receiving table lifting device is held in the raised position. That is, the pair of sliders 14 and 14 is pulled to the highest position by extension of the hydraulic cylinder 30 as a driving device, and the inner column 3 that engages with each slider 14 is also held at the highest position, and the stopper 12 at the lower end thereof. , 12 are abutted with stoppers 10, 10 at the lower ends of the outer columns 2, 2, respectively. Then, as shown by a chain line in FIG. 3, the load receiving platform 1 in the raised position rises and rotates at the storage position and is locked by a locking mechanism (not shown).
[0023]
Next, a case where the cargo receiving work is performed by raising and lowering the load receiving table lifting device will be described.
[0024]
(1) Lowering stage of the receiving platform (see Fig. 10)
If the load receiving platform 1 is held at the highest position, the load receiving platform 1 is rotated from the retracted position to the extended position [FIG. The wire ropes 32 and 33 are fed out and the pair of the slider 14 and the inner column 3 are lowered together in the outer column 2 by their own weight. Then, when the lower end of the inner column 3 is grounded to the ground [FIG. 10 (b)], only the slider 14 is lowered in the inner column 3 and the load receiving platform 1 is grounded to the ground and stopped. Is held in the lowered position [FIG. 10 (c)].
[0025]
By the way, in this embodiment, a frictional force holding means F comprising a pair of friction pads 24, 24 and a coil spring 25 is provided between the slider 14 and the inner column 3, whereby each slider 14 and the inner column 3 are provided. Since a predetermined frictional resistance acts between the columns 3, the slider 14 and the inner column 3 are lowered by the inner column 3 due to the reasons (1) to (4) during the simultaneous lowering due to the dead weight of the slider 14 and the inner column 3. Even if the resistance is generated, the inner column 3 is left behind and only the slider 14 descends first, and then the inner column 3 is prevented from descending at once by releasing the descending resistance. 1 can be lowered safely and smoothly.
[0026]
(2) Ascent process of the receiving platform (see Fig. 11)
After the load receiving / unloading position [FIG. 11 (a)] in which the load receiving platform 1 integrated with the inner column 3 and the slider 14 is grounded, the load is transferred between the ground and the load receiving surface 1a of the load receiving stand 1. If the hydraulic cylinder 30 as the driving device is extended, the two wire ropes 32 and 33 are pulled. At this time, the slider 14 and the inner column 3 rise together as a result of the friction force between them by the friction force holding means F [FIG. 11 (b)], and the stopper 12 at the lower end of the inner column 3 is moved to the outer side. When it comes into contact with the stopper 10 at the lower end of the column 2, only the slider 14 rises to the highest position in the inner column 3 and the outer column 2, and the load receiving surface 1 a of the load receiving platform 1 moves to the floor of the packing box V. It is held flush with the surface [FIG. 11 (c)], and the package is transferred between the load receiving platform 1 and the packing box V.
[0027]
After the cargo handling operation is completed, the cargo receiving platform 1 is rotated upward and stored about the pivot 19 points (stored in the chain line in FIG. 3), and the lorry is kept in the running posture.
[0028]
By the way, in the lowering process of the load receiving platform 1 of (1), in the conventional one without the frictional force holding means F,
(1) Twist of the coconut frame S and the outer column 2 on rough terrain,
(2) Twisting of the slider 14 and the inner column 3 when a left and right unbalanced load is placed on the load receiving platform 1,
(3) Mixing of dust, sand, pebbles, etc. between the outer column 2 and the inner column 3
(4) Processing of outer column 2 and inner column 3, poor assembly accuracy,
As a result, the inner column 3 may be strongly engaged with the outer column locally, and as a result, a large frictional resistance is generated between the inner column 3 and the outer column 2. In this embodiment, as described above, there is a case in which an unexpected lowering resistance is generated and then the lowering resistance of the inner column 3 is released to cause the inner column 3 to fall at once. A predetermined frictional force is always positively applied between the slider 14 and the inner column 3 by the frictional force holding means F, that is, the pair of pads 24, 24 and the coil spring 25. As a result, it is possible to prevent only the slider 14 from descending prior to the inner column, thereby preventing the occurrence of the above-mentioned situation.
[0029]
The pair of friction pads 24 constituting the frictional force holding means F has a grease groove 24b formed on its outer surface, that is, a pressure contact surface with the inner wall surface of the inner column 3, and filled with grease G, The relative movement between the slider 14 and the inner column can be smoothly performed without any problem while giving a predetermined frictional resistance.
[0030]
As mentioned above, although one Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.
[0031]
For example, in the above-described embodiment, the case where the cargo carrier lifting device of the freight vehicle according to the present invention is implemented in the rear cargo carrier lifting device (tailgate lifter) of the truck is described. The present invention can also be applied to a lifting device (side gate lifter) and a load receiving device lifting device for other vehicles. Further, a friction pad and an elastic portion may be provided on the inner column, and the friction pad may be elastically biased to the side surface of the slider.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the cargo receiving platform lifting device, a friction between the slider and the inner column for maintaining a predetermined frictional force therebetween. Since the inner column is prevented from dropping when the slider) is lowered , the inner column and the slider provided with the load receiving table are grounded until the inner column is grounded. The inner column can always be lowered, the unstable lowering operation of the inner column can be eliminated, and the expected lowering operation of the inner column and the slider can be guaranteed, and the safety and smoothness of the cargo handling work can be ensured. Can be improved.
[0033]
According to a second aspect of the present invention, in the first aspect of the present invention, the frictional force holding means includes a pair of pads provided on the slider and the pads facing the inner wall surface of the inner column. Since it is composed of an elastic member that urges and urges the elastic force, the same effect as that of the invention of claim 1 can be obtained, and a frictional force can be equally applied between the slider and the inner column on both sides thereof. These integral operations can be performed more reliably and lightly.
[0034]
According to a third aspect of the present invention, in the one according to the second aspect, a grease groove filled with grease is formed on the outer surface of the pair of pads in contact with the inner wall surface of the inner column. In addition to the effects equivalent to those of the invention according to the second aspect, smooth and light relative movement can be ensured while maintaining a predetermined frictional resistance between the inner column and the slider.
[Brief description of the drawings]
FIG. 1 is a rear perspective view of a cargo truck showing a state in which the load receiving platform of the load receiving platform lifting device is lowered. FIG. 2 shows a state in which the load receiving platform of the load receiving platform lifting device along the line 2-2 in FIG. Rear side view of the lorry [FIG. 3] Rear side view of the lorry showing the state where the cradle of the cradle lift is raised to the highest level [FIG. 4] FIG. 5 is an enlarged cross-sectional view taken along line 4-4 of FIG. 3 is an enlarged cross-sectional view taken along line 5-5 in FIG. 3. FIG. 6 is an enlarged view of an imaginary line encircled portion taken along line 6 in FIG. 2. FIG. 8 is an enlarged cross-sectional view taken along line 8-8 in FIG. 6. FIG. 9 is a partial cross-sectional view taken along line 9-9 in FIG. 8. FIG. 10 is a diagram showing the descending process of the load receiving base. Diagram showing the ascent process
1 ······································································ Outer column 3 ··············································································· Grease groove 25
30 ・ ・ ・ ・ ・ ・ ・ ・ Driver (hydraulic cylinder)
F ······························ Friction force retaining means G ········· Grease groove

Claims (3)

荷箱(V)に略鉛直に固定される一対のアウタコラム(2)と、該アウタコラム(2)に昇降可能に嵌挿されるインナコラム(3)と、該インナコラム(3)に昇降可能に設けられるスライダ(14)と、このスライダ(14)に、張出、格納可能に支持される荷受台(1)と、前記スライダ(14)に連結され該スライダ(14)を前記インナコラム(3)に沿って昇降駆動する駆動装置(30)とを備え、前記駆動装置(30)の非作動時には、前記インナコラム(3)およびスライダ(14)が自重により共に下降して前記荷受台(1)が地上に設置され、また前記駆動装置(30)の作動時には、前記駆動装置(30)がスライダ(14)を上昇させるのに伴ってインナコラム(3)共に上昇、荷受台(1)を、その荷受面(1a)が荷箱(V)の床面と略同一面となるまで上昇させるようにした、貨物車両の荷受台昇降装置において、
前記スライダ(14)と、前記インナコラム(3)との間には、それら間に所定の摩擦力を保持するための摩擦力保持手段(F)を設け、スライダ(14)の下降時におけるインナコラム(3)の落下を防止したことを特徴とする、貨物車両の荷受台昇降装置。
A pair of outer columns (2) fixed substantially vertically to the packing box (V), an inner column (3) fitted to the outer column (2) so as to be movable up and down, and movable up and down to the inner column (3) A slider (14) provided on the slider, a load receiving base (1) supported to be able to project and retract on the slider (14), and the slider (14) connected to the slider (14) to connect the slider (14) to the inner column ( 3), and the inner column (3) and the slider (14) are both lowered by their own weight when the driving device (30) is inoperative. 1) it is installed on the ground, also upon actuation of the driving device (30) are both increased inner column (3) with the said drive device (30) to raise the slider (14), receiving platform ( 1) the receiving surface (1 ) Were to be raised to the floor surface substantially the same surface of the packing box (V), in receiving platform lifting device of goods vehicles,
Friction force holding means (F) is provided between the slider (14) and the inner column (3) to hold a predetermined friction force therebetween, and the inner when the slider (14) is lowered. A cargo receiving platform raising / lowering device for a freight vehicle, wherein the column (3) is prevented from falling .
前記摩擦力保持手段(F)は、スライダ(14)に設けた一対のパッド(24)と、それらのパッド(24)をインナコラム(3)の内壁面に向けてそれぞれ弾発付勢する弾性部材(25)とよりなることを特徴とする、前記請求項1記載の貨物車両の荷受台昇降装置。  The frictional force retaining means (F) includes a pair of pads (24) provided on the slider (14), and an elastic force that elastically urges the pads (24) toward the inner wall surface of the inner column (3). The cargo receiving platform elevating device for a freight vehicle according to claim 1, characterized in that it comprises a member (25). 前記一対のパッド(24)の、前記インナコラム(3)の内壁面と接する外面には、グリス(G)を充填したグリス溝(24b)が形成されていることを特徴とする、前記請求項2記載の貨物車両の荷受台昇降装置。  The grease groove (24b) filled with grease (G) is formed on the outer surface of the pair of pads (24) contacting the inner wall surface of the inner column (3). 2. Cargo cradle lifting device of claim 2.
JP2002152355A 2002-05-27 2002-05-27 Cargo cradle lifting device Expired - Lifetime JP4125544B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106515546A (en) * 2015-09-09 2017-03-22 青岛玉清畜禽专用车辆有限公司 Multi-functional living animal transport vehicle capable of automatically weighing

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JP6195158B2 (en) * 2013-11-07 2017-09-13 極東開発工業株式会社 Loading platform lifting device
CN103738227B (en) * 2013-12-30 2016-08-17 河南农业大学 Vertical lift device for Double-layer special transport vehicle for beef cattle
KR200477231Y1 (en) * 2014-11-05 2015-05-19 김우곤 Lift Apparatus for Freight Vehicle
KR200483239Y1 (en) * 2016-09-30 2017-05-02 김현희 Vertical Lift Gate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106515546A (en) * 2015-09-09 2017-03-22 青岛玉清畜禽专用车辆有限公司 Multi-functional living animal transport vehicle capable of automatically weighing

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