JP2004090876A

JP2004090876A - Stopper device of load receiving bed hoisting and lowering device of vehicle

Info

Publication number: JP2004090876A
Application number: JP2002257977A
Authority: JP
Inventors: Yasushi Maeda; 前田　泰志; Masataka Tokunaga; 徳永　政隆
Original assignee: Kyokuto Kaihatsu Kogyo Co Ltd
Current assignee: Kyokuto Kaihatsu Kogyo Co Ltd
Priority date: 2002-09-03
Filing date: 2002-09-03
Publication date: 2004-03-25
Anticipated expiration: 2022-09-03
Also published as: JP4073738B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper device of a load receiving bed hoisting and lowering device of a vehicle which solves the problem of fear of causing damage to a base part side load receiving bed by energizing an operation lever to the lock side and regulating its freely oscillating and sliding move when an engaging member is half-locked to an engaged member. <P>SOLUTION: In this stopper device, a stopper 15 can be engaged to a storage position by engaging an engaged member 30 on the stopper 15 side with an engaging member 31 on the load receiving bed 8 side by elastic force of first and second compression coil springs 40, 54 by operation of an operation lever 56. When the engaging member 31 and the engaged member 30 are in the half-lock state, the second compression coil spring 54 elastically energize the operation lever 56 to the lock side for preventing the freely oscillating and sliding move. When the load receiving bed 8 is contained, the operation lever 56 freely oscillates to prevent the tip from bumping against the load box or the load receiving bed 8. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、貨物自動車などの車両の車体に設けられて、車体上の荷箱と地上間で荷物の積み降ろしを行なう荷受台昇降装置において、荷受台上に載置されるカートの車輪などを荷受台上に受け止めて、その落下を防止するようにしたストッパ装置に関するものである。
【０００２】
【従来の技術】
従来、貨物自動車の車体後部に設けた荷受台昇降装置（テールゲイトリフター）において、荷受台にストッパと、このストッパを突出・格納操作する操作レバーとを設け、前記ストッパを突出させたとき、これを荷受台上に載置されたカートの車輪に当接させて、該カートを受け止めてその落下を防止するようにした、ストッパ装置は、公知である（たとえば特許文献１参照。）。
【０００３】
【特許文献１】
特開平１１−１２３９７５号公報
【０００４】
【発明が解決しようとする課題】
ところで、前記公知のものでは、図１２（ａ）に示すように、操作レバーをロック位置に操作することにより、圧縮ばねの弾発力により、係合部材を被係合部材に係合させてストッパを伏倒位置に格納させ、また、図１２（ｂ）に示すように、操作レバーをロック解除位置に操作することにより、係合部材を被係合部材から外してストッパを圧縮ばねの附勢力により突出させて荷受台の荷受面よりも突出させるように構成されている。
【０００５】
ところが、この公知のものでは、係合部材と被係合部材間の多少の位置ズレ、その他何らかの原因により、図１３に示すように、係合部材が被係合部材に完全に係合しきらずに、半ロック状態になることがあり、このとき、操作レバーは、ロック位置とアンロック位置との中間に位置して、フリーに回転可能な状態になる。この場合、
▲１▼前記特許文献（特開平１１−１２３９７５号公報）に示されるもののように、荷受台昇降装置の荷受台が起立格納式のものでは、荷受台を荷箱に沿うように起立回動して格納した際に、フリー状態にある操作レバーは自重により揺動、起立して、その先端部が荷箱側に向いた状態になり、その結果荷受台は格納位置で、操作レバーの先端部が荷箱に衝接して、その荷箱を損傷させる虞れがあるという問題がある。また、
▲２▼後述する本発明の実施例に示すように、荷受台昇降装置の荷受台（折り畳み可能）が床下格納式のものでは、荷受台の格納時に、基部側荷受台に対して先部側荷受台を折り畳むべく裏返すと、フリー状態にある操作レバーが自重により揺動して、その先端部が下向きになり、先部側荷受台を基部荷受台上に折り畳んだときに、その操作レバーの先端部が基部側荷受台に衝接して、基部側荷受台を損傷させる虞れがあるという問題がある。
【０００６】
本発明はかかる実情に鑑みてなされたもので、係合部材が被係合部材に対して半ロック状態になったとき、操作レバーをロック側に附勢して、そのフリーな揺動、スライド移動を規制して前記問題を解決できるようにした、新規な車両の荷受台昇降装置におけるストッパ装置を提供することを目的とするものである。
【０００７】
【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、荷箱を搭載した車体に、昇降機構を介して荷受台を昇降可能に設け、該荷受台は、水平状態で荷箱の荷台と地上間で昇降作動され、また前記荷受台は折り畳まれて荷箱の床下に格納、あるいは荷箱に沿って起立格納されるようにした、車両の荷受台昇降装置において、前記荷受台は、その荷受面と略面一な格納位置と、その荷受面より突出する突出位置とに保持され、かつ附勢手段により突出位置に附勢されるストッパおよび前記ストッパを格納位置にロック、あるいはロック解除するロック手段を備え、前記ロック手段は、前記ストッパ側に設けられる被係合部材と、前記荷受台側に設けられて前記被係合部材に係脱し得るように、ロック側とロック解除側にスライド作動し得る係合部材と、前記係合部をロック側に附勢する第１の附勢手段と、前記荷受台に揺動可能に軸支されて前記係合部材に連動される操作部材と、該操作部材の揺動操作に関連して前記係合部材をスライド作動するガイド手段と、前記操作部材をロック側に附勢し、前記第１の附勢手段よりも附勢力の大きい第２の附勢手段とを含み、前記第２の附勢手段は、係合部材が被係合部材に対して半ロック状態になったとき、前記操作部材をロック側に附勢してそのフリーな揺動およびスライド移動を規制し、荷受台の格納時に、該操作部材の先端部が荷受台の荷受面から突出するのを防止するようにしたことを特徴としており、かかる特徴によれば、荷受台側の係合部材が、ストッパ側の被係合部材と半ロック状態となることがあっても、該係合部材を操作する操作部材が、フリーに揺動、スライド移動するのを規制して、荷受台の格納時に、操作部材の先端部が、荷箱や荷受台に衝接することがなく、該荷箱や荷受台の損傷を防止することができる。
【０００８】
【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。
【０００９】
まず、図１〜９を参照して本発明の第１実施例について説明する。
【００１０】
この実施例は、床下格納式の荷受台を備えた荷受台昇降装置に、本発明ストッパ装置を実施した場合であり、図１は、本発明装置を備えた貨物自動車の後部側面図、図２は、図１の２矢視平面図、図３は、図２の３矢視仮想線囲い部分の一部破断拡大図、図４は、図３の４−４線に沿う断面図、図５は、図２の５矢視仮想線囲い部分の一部破断拡大図、図６は、図５の６−６線に沿う断面図、図７は、図５の７−７線に沿う断面図、図８は、図６の８−８線に沿う断面図、図９は、ストッパ装置の作用を示す断面図である。
【００１１】
図１において、貨物自動車の車体１上には、荷台３を有する荷箱２が搭載され、この荷箱２の後面に図示しない後部扉により開閉される出入口４が開口される。車体１の後部には、荷箱２の床下に格納可能な荷受台昇降装置Ｌが、前後方向に移動可能に支持される。車体１の後部には、支持フレーム５が該車体１の前後方向に移動可能に支持されている。支持フレーム５には、メインアーム６およびサブアーム７が上下方向に揺動可能に軸支され、これらのアームの先部に後述する荷受台８の基部フレーム９が連結される。また、前記支持フレーム５とメインアーム６との間には昇降用油圧シリンダ１０の両端が連結されている。荷受台８は、前記支持フレーム５に一体的に設けられる基部側荷受台８Ａと、その自由端に、ヒンジ軸１１を以て折り畳み可能に連結される先部側荷受台８Ｂとよりなり、図１鎖線に示すように先部側荷受台８Ｂは、ヒンジ軸１１まわりに基部側荷受台８Ａ上に重なるように反転して折り畳むことができる。荷受台８は昇降用油圧シリンダ１０の伸縮作動により、図１の実線と鎖線で示すように昇降作動することができ、上昇位置にある荷受台８は、荷箱２の荷台３と略同一面とすることができ、また、鎖線に示すように下降位置にある荷受台８は、荷箱２の床下に格納することができる。
【００１２】
なお、荷受台８の昇降装置およびその荷箱２の床下への格納装置は従来公知のものであるので、その詳細な説明を省略する。
【００１３】
図２に示すように、基部側荷受台８Ａと、その先部にヒンジ軸１１を以て折り畳み可能に接続される先部側荷受台８Ｂとよりなる荷受台８は、全体がＡｌ合金の押出成型により構成され、それらの左右両側縁は、縁取部材１２により縁取りされている。
【００１４】
先部側荷受台８Ｂの後端寄りの部分には、本発明にかかるストッパ装置Ｓが設けられ、このストッパ装置Ｓは、荷受台８上に載置された荷役物、特にカートを的確に受け止めて、これが荷受台８の昇降中に落下するのを未然に防止するためのものであり、以下にこのストッパ装置Ｓの構造を説明する。
【００１５】
図２，４に示すように、先部側荷受台８Ａの後端、すなわちその自由端寄りの部分には、その左右方向の帯状のストッパ収容凹部１６が形成され、このストッパ収容凹部１６には、後述する帯状のストッパ１５が収容され、このストッパ１５の一方の端縁に隣接して先部荷受台８Ｂに側縁（図５、左側縁）には、後述する操作レバー５６を配置するための操作フレーム１３が固定されている。
【００１６】
図４に示すように、ストッパ収容凹部１６の後部寄りの底部には、断面優弧状のピボット軸１７が、その全長に亘って一体に形成されている。ストッパ収容凹部１６内には、帯状のストッパ１５が突出、格納可能に収容されており、このストッパ１５の長手方向の一側に形成した断面優弧状の凹溝１８が、前記ピボット軸１７に回動自在に嵌合されており、ストッパ１５はピボット軸１７まわりに、図４に実線で示す伏倒位置（格納位置）と、同図鎖線に示す突出位置（作動位置）との間で回動できるようになっている。ストッパ１５の先部、すなわちその自由端部には、内向きに傾斜した係止面１５ａが形成されており、ストッパ１５が、図４に鎖線で示すように起立されると、前記係止面１５ａは、荷受台８の荷受面に対して略鉛直に突出した状態となり、荷受台８上のカートの車輪などを受け止めることができるようになっている。また、前記ストッパ収容凹部１６には、前記係止面１５ａに対応して傾斜面１６ａが形成されており、ストッパ１５が、図２に実線で示すように、格納位置に伏倒すると、前記係止面１５ａが傾斜面１６ａに当接されるようになっている。前記ストッパ１５の係止面１５ａに嵌着した断面円形のゴムクッション１９は、その当接時のショックおよび衝撃音を緩和する。また、ストッパ収容凹部１６の後端隅部にもゴムクッション２０が設けられ、ストッパ１５が起立回動したとき、その基部が、そのゴムクッション２０に当接して、その際のショックおよび衝撃音を緩和する。
【００１７】
図３，４に示すように、前記ストッパ収容凹部１６の空間部には、ストッパ１５を突出位置に附勢する附勢手段２１が収納されている。この附勢手段２１は、その空間部の長手方向に沿って設けらる長いボルト２２ａと、これに螺着されるナット２２ｂとよりなるばね軸２２と、このばね軸２２に巻装されて、長いボルト２２ａの頭部と、ナット２２ｂ間に取付けられる一対の捩りばね２３，２３より構成されており、一対の捩りばね２３，２３の一方の自由端は、ストッパ収容凹部１６の底壁に形成したフック状の下部係合凹部２４に、またその他方の自由端は、ストッパ１５の裏面に形成したフック状の上部係合凹部２５にそれぞれ係合されており、一対の捩りばね２３，２３の弾発力は、前記ストッパ１５を突出位置（図４鎖線位置）に附勢している。
【００１８】
前記ストッパ収容凹部１６の左右方向の一側（車両の進行方向左側）には、前記ストッパ１５を伏倒位置（格納位置）にロックし、あるいはロック解除するロック手段ＬＯが設けられる。つぎにこのロック手段ＬＯの構成を、主に図５〜８を参照して説明する。
【００１９】
このロック手段ＬＯは、ストッパ１５の裏面に固定される被係合部材３０と、この被係合部材３０に係脱し得る係合部材３１と、この係合部材３１を作動する作動機構３２とより構成されている。前記被係合部材３０は、図６に示すように、ストッパ１５の裏面にボルト止めされる支持部材３３に一体に垂設されて、Ｕ字状に形成される。一方、前記係合部材３１は、先端に前記被係合部材３０と係脱し得る先部の上面に、前方に向かって下る傾斜案内面３１ａを有して断面四角な棒状に形成されている。前記作動機構３２は、手動により前記係合部材３１を、被係合部材３０に対して前後にスライド移動させて、そこに係脱できるように構成されており、以下にその具体的な構造について説明すると、荷受台８の、ストッパ収容凹部１６下の底板３５にはベース３６が固定され、このベース３６の、前記被係合部材３０寄りの上面には、中空の角筒部材３８が固定され、この角筒部材３８に前記係合部材３１が前記被係合部材３０に対して前後にスライド移動できるように嵌挿されている。角筒部材３８内には、その後端壁と係合部材３１の後端間に第１の附勢手段４０、すなわち第１の圧縮コイルばねが縮設されており、この第１の附勢手段４０の弾発力は、係合部材３１を突出する方向、すなわち被係合部材３０と係合する方向に常時附勢している。また、角筒部材３８内には、その後端壁に開口した通孔を貫通して、その角筒部材３８の中心軸線に沿って案内棒４１が挿入され、この案内棒４１は、前記圧縮コイルばねよりなる第１の附勢手段４０を挿通して係合部材３１の中心軸線に沿って穿設した行き止まりの案内孔４３内に摺動自在に嵌入されている。また係合部材３１の中間部には、その長手方向に沿って長孔４４が穿設され、この長孔４４に、案内棒４１の途中に横向きに固定した係合ピン４６が摺動自在に係合されている。したがって図６，８に示すように、前記係合部材３１は、第１の圧縮コイルばね４０の弾発力により、係合ピン４６が長孔４４の後端に係合するまで前方、すなわち被係合部材３０に向けて突出するように附勢される。案内棒４１の角筒部材３８よりも後方に突出する後端には、径大なボス部４１ａが一体に形成され、このボス部４１ａの端面が、後述する第２の附勢手段である前記第２の圧縮コイルばね５４（第１の圧縮コイルばね４０よりもばね力が大きい）の弾発力により角筒部材３８の後端面に突き当たることにより、案内部材４１の位置が規制される。前記案内棒４１後端のボス部４１ａには、その案内棒４１と同一軸線上に、長いボルトよりなる作動棒４８の先端部が螺合されて、長さを調節機構４９を介して一体に連結される。長さ調節機構４９は、ボス部４１ａに形成した雌ねじ孔４９ａと、作動棒４８の一端部に形成されて雌ねじ孔４９ａに長さ調節可能に螺合される雄ねじ４９ｂと、その雄ネジ４９ｂに螺合されてボス部４１ａの外端にに衝き当てられるナット４９ｃとより構成されている。
【００２０】
図５、６に示すように、作動棒４８は、前記ストッパ１５を越えて荷受台８の側縁の操作フレーム１３の下まで延長しており、その延長部は、そこに嵌挿されるスリーブ５０を介してベース３６に固定された軸受５１に摺動自在に貫通支持されている。スリーブ５０の外端は末広状に拡開されていて長いボルトよりなる作動棒４８の外端の頭部に、第２の附勢手段すなわち第２の圧縮コイルばね５４の弾発力により係合しており、作動棒４８とスリーブ５０とは一体的に外方（図６左方向）へ移動可能である。作動棒４８の嵌挿されて前記ナット４９ｃに着座されるバネ座５３と、前記軸受５１の端縁間には、前記第１の附勢手段４０よりもばね力の大きい第２の附勢手段すなわち第２の圧縮コイルばね５４が縮設されており、この第２の圧縮ばね５４は、作動棒４８および案内棒４１を介して前記係合部材３１を突出する方向（図６，８右方向）に弾発附勢している。
【００２１】
図５〜７に示すように、前記軸受５１と作動棒４８の端縁間のスリーブ５０の外周には、上方に延びる操作部材としての操作レバー５６を固定したレバースリーブ５７が一体に設けられており、ベース３６の外端部には、前記操作レバー５６を取り囲むようにして、門型の形成した操作盤５８が固定され、この操作盤５８の上面は、先部荷受台８Ｂの一側に固定した操作フレーム１３の開口を通して外部に露出しており、その上面にガイド溝６０が形成され、このガイド溝６０に前記操作レバー５６が貫通し、この操作レバー５６は、操作フレーム１３の開口を通って荷受台８上より操作できるようになっている。ガイド溝６０には、操作レバー５６を前記第１、第２の圧縮コイルばね４０，５４の弾発力に抗してロック解除位置（係合部材３１の後退位置）に係止するための第１溝部６０ａと、この第１溝６０ａと反対側にあって、前記操作レバー５６を前記第１、第２の圧縮コイルばね４０，５４の弾発力によりロック位置（係合部材３１の前進位置）に保持するとともに前記ロック解除位置への移動を許容する軸方向の長さを有する第２溝部６０ｂが形成され、さらに前記第１溝部６０ａと第２溝部６０ｂ間に跨がり、操作レバー５６をそれらの溝６０ａ，６０ｂ間に案内する傾斜カム面６０ｃが形成されており、この傾斜カム面６０ｃの一端は、第２溝６０ｂ内に臨んでいる。
【００２２】
つぎに、この第１実施例の作用について説明する。
【００２３】
いま、貨物自動車が走行状態にあり、荷受台８が図１に示すように、格納位置にあるときは、荷受台８に設けたストッパ１５は、格納位置すなわち伏倒位置にあり、この状態では、ロック位置に保持される。すなわち、操作レバー５６は図５，６に示すように、第２溝部６０ｂにあり、係合部材３１は第１および第２の圧縮コイルばね４０，５４の弾発力により、作動棒４８および案内棒４１を介して係合位置に突出附勢され、これがストッパ１５側の被係合部材３０に係合してストッパ１５は格納位置に伏倒される。
【００２４】
つぎに、貨物自動車を停車させ、荷箱２内の荷物を地上に降ろす場合には、荷台３を格納状態から図１に実線で示すように、荷箱２の荷台３と同じレベルまで上昇させ、先部側荷受台８Ｂを手動により張出位置に回動させる。つぎに格納位置にある操作レバー５６を足で蹴るなどして外側に移動させると、該操作レバー５６は、第１，２圧縮コイルばね４０，５４の弾発力に抗して案内溝６０の傾斜カム面６０ｃに沿って外側に移動して第１溝部６０ａに係合する。これにより作動部棒４８および案内棒４１が第１，２圧縮コイルばね４０，５４の弾発力に抗して後退し、図９（ａ）に示すように、係合部材３１が後退作動されて、被係合部材３０から外れる。以上のように、ストッパ１５がロック解除位置に保持されると、ストッパ１５は、附勢手段２１の一対の捩りばね２３の附勢力により、図４鎖線に示すように上方に回動して突出位置に保持される。このとき、操作レバー５６は、案内溝６０の傾斜カム面６０ｃに係合しているため、第１，２圧縮コイルばね４０，５４の附勢力により自動的にロック位置に戻される。
【００２５】
つぎに、荷台３上の荷物を図示しないカートに移載して荷受台８上に移動し、荷受台昇降装置Ｌの作動により荷受台８を下降させる。このときカートの車輪は、突出しているストッパ１５の係合面１５ａに当接して、荷受台８の先部からカートが落下するのを防止することができる。荷受台８が地上まで下降したら、突出しているストッパ１５を足で踏みつけるなどして図４に示すように格納位置に揺動する。このとき、ストッパ１５下の被係合部材３０は、ロック位置（突出位置）にある係合部材３１の傾斜案内面３１ａに押し付けられ、この押付力の、係合部材３１の軸方向の分力により係合部材３１は、第１，２コイル圧縮ばね４０，５４の附勢力に抗して後退方向にスライドするため、被係合部材３０が係合部材３１よりも下方に移動すると、被係合部材３０による押付力から解除された係合部材３１は、第１，２圧縮コイルばね４０，５４の附勢力により係合方向にスライド前進して、図６に示すように被係合部材３０に係合することができる。これにより、ストッパ１５は、荷受台８の上面と略同一面になり、荷受台８上のカートを支障なく地上に降ろすことができる。
【００２６】
つぎに、地上の荷物を荷箱２の荷台３上に積み込む場合には、操作レバー５６を荷受台８の基部側から先部側に向かって足で蹴るなどして、該操作レバー５６を起立揺動させる。すると、操作レバー５６は、案内溝６０の傾斜カム面６０ｃに沿って移動し、これにより係合部材３１はロック位置からロック解除位置に後退してその位置に保持される。これによりストッパ１５は捩りばね２３の弾発力によりふたたび突出位置に保持される。
【００２７】
つぎに、地上の荷物をカートに載せて荷受台８上に走行移動させる。このとき、カートの前輪が、捩りばね２３の弾発力に抗してストッパ１５を乗り越えると、ストッパ１５は、ふたたび捩りばね２３の弾発力により、起立位置まで上方に回動して、カートを荷受台８上に係止することができる。このため、作業者が誤ってカートから手を離しても、カートが地上に逆戻りすることが防止される。
【００２８】
さらに荷受台８上のカートを荷箱２に向けて押して、その後輪がストッパ１５を踏み越えると、ふたたびストッパ１５が突出位置に保持される。その後、荷受台昇降装置Ｌの作動により荷受台８を荷台３と略面一になるまで上昇させ、カートを荷台３上に走行移動させることができる。このとき、カートの後輪は、ストッパ１５の係止面１５ａに当接されているためカートが荷受台８から落下することが防止される。
【００２９】
前述した積み降ろし作業が終了したら、操作レバー５６を先部側から基部側に向かって足で蹴るなどして揺動させると、該操作レバー５６はガイド溝６０の傾斜カム面６０ｃから第２溝部６０ｂに移動し、作動棒４８は第１，２の圧縮コイルばね４０，５４の附勢力により、係合部材３１は後退位置（ロック解除位置）からスライドして前進位置（ロック位置）に保持される。この状態からストッパ１５を踏みつけるなどして伏倒位置に回動すると、図６に示すように、被係合部材３０は係合部材３１に係合して、図４に実線で示すように、ストッパ１５は格納位置に保持される。そして、ストッパ１５の格納後は、荷受台昇降装置Ｌの格納作動により、荷受台８は、その基部荷受台８上に、先部荷受台８を折り畳んで、図１に鎖線で示すように荷箱２の床下に格納される。
【００３０】
ところで、ストッパ１５は、操作レバー５６の揺動およびスライド操作で係合部材３１を前進あるいは後退させて、被係合部材３０に係脱させ、ストッパ１５を格納位置に伏倒し、あるいは作動位置に突出させるものであるが、係合部材３１と被係合部材３０の相互間の多少の位置ずれ、その他の何らかの原因で、図９（ｂ）に示すように、係合部材３１は、被係合部材３０に対して半ロック状態（半係合状態）になることがある。かかる場合に、前記従来のものでは、操作レバーは、自由な揺動およびスライド移動が許容される状態となるため、荷受台８の格納時には、操作レバーはその自重で下方に揺動し、その先端部が、荷受台８の
荷受面から突出して、前記
【発明が解決しようとする課題】の項で述べた▲１▼あるいは▲２▼の不都合を生起するが、この実施例のものでは、操作レバー５６は、係合部材３１が被係合部材に対して半ロック状態にある場合に、第１の圧縮コイルばね４０よりもばね力の大きい第２の圧縮コイルばね５４の弾発力で一方向に附勢され、第２の溝６０ｂ内でロック側に弾発保持されるので、そのフリーな揺動およびそのスライド移動が抑止されて、荷受台８を格納しても操作レバー５６がその自重で揺動、スライド移動することがなく、その先端部が、荷受台８に衝接して該荷受台を損傷することがない。
【００３１】
なお、荷受台昇降装置の荷受台が起立格納式の場合には、操作レバー５６の先端部が、荷箱に衝接して該荷箱を損傷することがない。
【００３２】
つぎに、本発明の第２実施例について説明する。
【００３３】
図１０（ａ）は、本発明の第２実施例を示す、ストッパ装置の要部の断面図であり、図中、前記第１実施例と同じものには、同じ符号が付される。
【００３４】
この第２実施例は、第２の附勢手段である、第２圧縮コイルばね５４の取付位置が、前記第１実施例のものと相違しており、作動棒４８の外端には、ばね座１０１が固定され、このばね座１０１と操作レバー５６間に第２圧縮コイルばね５４が縮設され、このばね５４の弾発力は、係合部材３１の位置に関係なく、操作レバー５６を案内溝６０の第２溝部６０ｂ側に附勢し、そのフリーな揺動、スライド移動を防止する。
【００３５】
そして、この第２実施例のものも前記第１実施例のものと同じ作用効果を奏する。
【００３６】
つぎに、本発明の第３実施例について説明する。
【００３７】
図１０（ｂ）は、本発明の第３実施例を示す、ストッパ装置の要部の断面図であり、図中、前記第１実施例と同じものには、同じ符号が付される。
【００３８】
この第３実施例は、第２の附勢手段である、第２圧縮コイルばね５４の取付位置が、前記第１実施例のものと相違しており、作動棒４８の外端には、ばね座２０１が固定され、このばね座２０１と操作レバー５６と一体のレバースリーブ５７間に第２圧縮コイルばね５４が縮設され、このばね５４の弾発力は、係合部材３１は被係合部材に対して半ロック状態にある場合に、操作レバー５６を案内溝６０のロック側に附勢し、そのフリーな揺動、スライド移動を防止する。
【００３９】
そして、この第３実施例のものも前記第１実施例のものと同じ作用効果を奏する。
【００４０】
つぎに、本発明の第４実施例について説明する。
【００４１】
図１０（ｃ）は、本発明の第４実施例を示す、ストッパ装置の要部の断面図であり、図中、前記第１実施例と同じものには、同じ符号が付される。
【００４２】
この第４実施例は、第２の附勢手段である、第２圧縮コイルばね５４の取付位置が、前記第１実施例のものと相違している。すなわち図１０（Ｃ）に示すように、角筒部材３１の外周には、外筒３０２が嵌合され、その前端は係合部材３１の前端に係合される。係合部材３１の中間部には、ばね座３０１が固定され、このばね座３０１と外筒３０２の後端間に、第２の附勢手段である第２圧縮コイルばね５４が縮設される。この第２圧縮コイルばね５４は、係合部材３１を突出方向に附勢すると共に操作レバー５６を第２溝部６０ｂの係合させて、そのフリーな揺動、スライド移動を防止するので、前記第１〜３実施例と同じ作用効果を奏する。
【００４３】
つぎに、本発明の第５実施例について説明する。
【００４４】
図１１（ｄ）および（ｅ）は、本発明の第５実施例を示す、図１１（ｄ）はストッパ装置の要部の断面図であり、図１１（ｅ）は、図１１（ｄ）のｅ−ｅ線に沿う断面図であり、前記第１実施例と同じものには、同じ符号が付される。
【００４５】
この第５実施例は、第２の附勢手段５４として、捩りばねを用いた場合であり、作動棒４８の中間部に巻装した、第２の附勢手段としての捩りばね５４の一方の端部はベース３６に係合され、またその他方の端部は操作レバー５６と一体のスリーブ５０の一端に係合される。捩りばね５４の弾発力は、スリーブ５０を介して操作レバー５６をガイド溝６０の第２溝６０ｂ側に附勢して、そのフリー揺動、スライド移動を防止するので、前記第１〜第４実施例と同じ作用効果を奏する。
【００４６】
以上、本発明の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。
【００４７】
たとえば、荷受台昇降装置の荷受台は、床下格納式のものについて説明したが、荷受台は、起立格納式、垂直昇降式、その他の型式のものでもよい。また、第２の附勢手段の取付位置は、前記第１〜第４実施例のほか、その機能を逸脱しない範囲で何処に取付けてもよく、また第１，２の附勢手段は、圧縮コイルばね、捩りばねのほか、従来公知の同効のものの使用が可能である。
【００４８】
【発明の効果】
以上のように、請求項１記載の発明によれば、車両における荷受台昇降装置において、荷受台側の係合部材が、ストッパ側の被係合部材と半ロック状態となることがあっても、該係合部材を操作する操作部材が、フリーに揺動するのを規制して、荷受台の格納時に、操作部材の先端部が、荷箱や荷受台に衝接することがないようにして、該荷箱や荷受台の損傷を防止することができる。
【図面の簡単な説明】
【図１】本発明装置を備えた貨物自動車の後部側面図（第１実施例）
【図２】図１の２矢視平面図
【図３】図２の３矢視仮想線囲い部分の一部破断拡大図
【図４】図３の４−４線に沿う断面図
【図５】図２の５矢視仮想線囲い部分の一部破断拡大図
【図６】図５の６−６線に沿う断面図
【図７】図５の７−７線に沿う断面図
【図８】図６の８−８線に沿う断面図
【図９】ストッパ装置の作用を示す断面図
【図１０】ストッパ装置の要部の断面図（第２、第３、第４実施例）
【図１１】ストッパ装置の要部の断面図およびそのｅ−ｅ線に沿う断面図（第５実施例）
【図１２】従来のストッパ装置のロック状態およびロック解除状態を示す断面図
【図１３】従来のストッパ装置の半ロック状態を示す断面図
【符号の説明】
１・・・・・・・・・車体
２・・・・・・・・・荷箱
３・・・・・・・・・荷台
８・・・・・・・・・荷受台
１５・・・・・・・・ストッパ
２１・・・・・・・・附勢手段（ばね手段）
２４・・・・・・・・摩擦パッド
３０・・・・・・・・被係合部材
３１・・・・・・・・係合部材
４０・・・・・・・・第１の附勢手段（第１圧縮コイルばね）
５４・・・・・・・・第２の附勢手段（第２圧縮コイルばね）
５６・・・・・・・・操作部材（操作レバー）
６０・・・・・・・・ガイド手段（ガイド溝）
ＬＯ・・・・・・・・ロック手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a loading / unloading device that is provided on a vehicle body of a vehicle such as a lorry, and that loads and unloads cargo between a packing box on the vehicle body and the ground. The present invention relates to a stopper device which is received on a load receiving table to prevent the stopper device from dropping.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a loading / unloading device (tail gate lifter) provided at a rear portion of a truck body, a stopper and an operation lever for projecting and retracting the stopper are provided on the receiving tray. There is a known stopper device in which the cart is brought into contact with the wheels of a cart placed on a loading tray to receive the cart and prevent the cart from dropping (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-123975
[0004]
[Problems to be solved by the invention]
By the way, in the known device, as shown in FIG. 12 (a), by operating the operation lever to the lock position, the engaging member is engaged with the engaged member by the elastic force of the compression spring. The stopper is retracted to the down position, and as shown in FIG. 12B, by operating the operation lever to the unlock position, the engaging member is disengaged from the engaged member, and the stopper is attached to the compression spring. It is configured to be protruded by the force and protruded from the receiving surface of the receiving table.
[0005]
However, in this known device, as shown in FIG. 13, the engaging member does not completely engage with the engaged member due to a slight positional shift between the engaging member and the engaged member, or some other cause. In some cases, the operation lever may be in a semi-locked state. At this time, the operation lever is positioned between the locked position and the unlocked position, and becomes freely rotatable. in this case,
{Circle around (1)} As described in the above-mentioned patent document (Japanese Patent Application Laid-Open No. H11-123975), in the case where the loading tray of the loading tray lifting device is of an upright retractable type, the loading tray is rotated upright along the packing box. When retracted, the operating lever in the free state swings and stands by its own weight, and its tip is directed toward the packing box. As a result, the loading tray is in the storage position and the tip of the operating lever is However, there is a problem in that the abutment may damage the packing box by contacting the packing box. Also,
{Circle around (2)} As shown in an embodiment of the present invention which will be described later, in the case where the loading tray (foldable) of the loading tray elevating device is stored below the floor, when the loading tray is retracted, the front side of the loading tray is shifted with respect to the base loading tray. When the loading tray is turned over to be folded, the operating lever in the free state swings by its own weight, and its tip is turned downward.When the front loading tray is folded on the base loading tray, the operating lever is released. There is a problem in that the distal end portion may abut the base-side receiving cradle and damage the base-side receiving cradle.
[0006]
The present invention has been made in view of such circumstances, and when the engaging member is in a semi-locked state with respect to the engaged member, the operating lever is urged to the lock side to freely swing and slide. It is an object of the present invention to provide a stopper device for a new vehicle receiving pallet elevating device that restricts movement and can solve the above problem.
[0007]
[Means for Solving the Problems]
Means for Solving the Problems To achieve the above object, the invention according to claim 1 is provided on a vehicle body equipped with a packing box so as to be able to move up and down via a lifting mechanism. In a vehicle cradle elevating device which is raised and lowered between the ground and the cradle is folded and stored under the floor of the packing box or stored upright along the packing box, the loading cradle has a A stopper held at a storage position substantially flush with the receiving surface and a projecting position protruding from the receiving surface, and urged to the projecting position by the urging means, and the stopper is locked or unlocked at the storage position. Locking means, wherein the locking means is slid to a locking side and an unlocking side so as to be engaged with and disengaged from the engaged member provided on the stopper side and the engaged member provided on the loading table side. Actuable engagement part A first urging means for urging the engaging portion toward the lock side, an operating member pivotally supported by the load receiving table and interlocked with the engaging member, and a swing of the operating member. Guide means for slidingly operating the engagement member in association with a moving operation; and second urging means for urging the operating member toward the lock side and having a greater urging force than the first urging means. The second urging means includes: when the engaging member is in a semi-locked state with respect to the engaged member, urges the operating member toward the lock side to perform free swinging and sliding movement thereof. Regulating the end of the operating member from being protruded from the receiving surface of the receiving cradle during storage of the receiving cradle. According to this feature, the engaging member on the receiving cradle side is provided. However, even if the locking member is in a semi-locked state with the engaged member on the stopper side, the engaging member is operated. The operating member is prevented from swinging and sliding freely, so that the tip of the operating member does not come into contact with the packing box or the receiving table when the receiving table is stored. Damage can be prevented.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.
[0009]
First, a first embodiment of the present invention will be described with reference to FIGS.
[0010]
This embodiment is a case in which the stopper device of the present invention is applied to a loading / unloading device having a storage container of a floor storage type, and FIG. 1 is a rear side view of a lorry equipped with the device of the present invention. FIG. 3 is a partially cut-away enlarged view of a portion surrounded by an imaginary line as viewed in the direction of the arrow 3 in FIG. 2, FIG. 4 is a cross-sectional view taken along the line 4-4 in FIG. Is a partially cutaway enlarged view of a portion surrounded by a virtual line in the direction of arrow 5 in FIG. 2, FIG. 6 is a cross-sectional view along line 6-6 in FIG. 5, and FIG. 7 is a cross-sectional view along line 7-7 in FIG. 8 is a sectional view taken along line 8-8 in FIG. 6, and FIG. 9 is a sectional view showing the operation of the stopper device.
[0011]
In FIG. 1, a cargo box 2 having a carrier 3 is mounted on a body 1 of a truck, and an entrance 4 which is opened and closed by a rear door (not shown) is opened on the rear surface of the carrier 2. At the rear of the vehicle body 1, a loading table lifting device L that can be stored under the floor of the packing box 2 is supported movably in the front-rear direction. A support frame 5 is supported at the rear of the vehicle body 1 so as to be movable in the front-rear direction of the vehicle body 1. A main arm 6 and a sub-arm 7 are pivotally supported on the support frame 5 so as to be vertically swingable, and a base frame 9 of a loading table 8 described later is connected to the front ends of these arms. Both ends of a hydraulic cylinder 10 for elevating and lowering are connected between the support frame 5 and the main arm 6. The receiving tray 8 comprises a base receiving tray 8A provided integrally with the support frame 5 and a front receiving tray 8B foldably connected to a free end thereof with a hinge shaft 11. FIG. As shown in FIG. 7, the front-side receiving tray 8B can be inverted and folded around the hinge shaft 11 so as to overlap the base-side receiving tray 8A. The loading platform 8 can be moved up and down as shown by a solid line and a dashed line in FIG. 1 by the expansion and contraction operation of the lifting hydraulic cylinder 10. The loading platform 8 in the raised position is substantially flush with the loading platform 3 of the packing box 2. In addition, the loading tray 8 at the lower position as shown by the chain line can be stored under the floor of the packing box 2.
[0012]
In addition, since the lifting device of the loading tray 8 and the storage device of the packing box 2 under the floor are conventionally known, detailed description thereof will be omitted.
[0013]
As shown in FIG. 2, the entire receiving base 8 composed of a base-side receiving base 8A and a front-side receiving base 8B foldably connected to a front end thereof by a hinge shaft 11 is formed by extrusion molding of an Al alloy. The left and right side edges thereof are bordered by a bordering member 12.
[0014]
A stopper device S according to the present invention is provided at a portion near the rear end of the front-side loading tray 8B, and this stopper device S accurately receives a cargo, particularly a cart, placed on the loading tray 8. This is to prevent the load receiving table 8 from dropping while being raised and lowered, and the structure of the stopper device S will be described below.
[0015]
As shown in FIGS. 2 and 4, a band-shaped stopper housing recess 16 in the left-right direction is formed at the rear end of the front-side loading tray 8A, that is, near the free end. In order to arrange an operation lever 56 to be described later on a side edge (FIG. 5, left side edge) of the leading end receiving tray 8B adjacent to one end edge of the stopper 15, a belt-shaped stopper 15 to be described later is accommodated. Operation frame 13 is fixed.
[0016]
As shown in FIG. 4, a pivot shaft 17 having an arc-shaped cross section is formed integrally with the stopper receiving recess 16 at the bottom near the rear portion thereof over the entire length thereof. A belt-shaped stopper 15 projects and is housed in the stopper housing recess 16 so as to be retractable. A groove 18 having an arc-shaped cross section formed on one side in the longitudinal direction of the stopper 15 is turned around the pivot shaft 17. The stopper 15 is movably fitted, and pivots around the pivot shaft 17 between a folded position (retracted position) indicated by a solid line in FIG. 4 and a protruded position (operated position) indicated by a chain line in FIG. I can do it. At the tip of the stopper 15, that is, at its free end, an inwardly inclined engaging surface 15a is formed. When the stopper 15 is erected as shown by a chain line in FIG. 15a is in a state of protruding substantially vertically with respect to the receiving surface of the receiving table 8, and is capable of receiving cart wheels and the like on the receiving table 8. The stopper receiving recess 16 is formed with an inclined surface 16a corresponding to the locking surface 15a. When the stopper 15 falls down to the storage position as shown by a solid line in FIG. The stop surface 15a comes into contact with the inclined surface 16a. The rubber cushion 19 having a circular cross section fitted on the locking surface 15a of the stopper 15 reduces shock and impact noise at the time of the contact. A rubber cushion 20 is also provided at the rear end corner of the stopper accommodating recess 16, and when the stopper 15 is turned upright, its base comes into contact with the rubber cushion 20 to reduce the shock and impact noise at that time. ease.
[0017]
As shown in FIGS. 3 and 4, an urging means 21 for urging the stopper 15 to the projecting position is accommodated in the space of the stopper accommodating recess 16. The biasing means 21 is wound around the spring shaft 22 including a long bolt 22a provided along the longitudinal direction of the space and a nut 22b screwed to the long bolt 22a. It comprises a pair of torsion springs 23, 23 attached between the head of the long bolt 22a and the nut 22b. One free end of the pair of torsion springs 23, 23 is formed on the bottom wall of the stopper housing recess 16. The hook-shaped lower engaging recess 24 and the other free end are engaged with a hook-shaped upper engaging recess 25 formed on the back surface of the stopper 15, respectively. The elastic force urges the stopper 15 to the projecting position (the position shown by the chain line in FIG. 4).
[0018]
On one side in the left-right direction of the stopper accommodating recess 16 (on the left side in the traveling direction of the vehicle), there is provided a lock means LO for locking or unlocking the stopper 15 at the lying position (storage position). Next, the configuration of the locking means LO will be described mainly with reference to FIGS.
[0019]
The locking means LO includes an engaged member 30 fixed to the back surface of the stopper 15, an engaging member 31 that can be disengaged from the engaged member 30, and an operating mechanism 32 that operates the engaging member 31. It is configured. As shown in FIG. 6, the engaged member 30 is formed integrally with a support member 33 which is bolted to the back surface of the stopper 15, and is formed in a U-shape. On the other hand, the engaging member 31 is formed in a rod shape with a rectangular cross section, having an inclined guide surface 31a that descends forward on an upper surface of a tip portion that can be engaged with and disengaged from the engaged member 30 at the tip. The operating mechanism 32 is configured to manually slide the engaging member 31 back and forth with respect to the engaged member 30 so that the engaging member 31 can be disengaged therefrom. More specifically, a base 36 is fixed to a bottom plate 35 below the stopper accommodating recess 16 of the load receiving table 8, and a hollow square tube member 38 is fixed to an upper surface of the base 36 near the engaged member 30. The engaging member 31 is fitted into the square tube member 38 so as to be slidable back and forth with respect to the engaged member 30. In the rectangular tube member 38, a first urging means 40, that is, a first compression coil spring, is contracted between a rear end wall and a rear end of the engaging member 31, and the first urging means is provided. The resilient force of 40 always urges the engaging member 31 in the projecting direction, that is, the direction of engaging with the engaged member 30. Further, a guide rod 41 is inserted into the rectangular tube member 38 along a central axis of the rectangular tube member 38 through a through hole opened in the rear end wall thereof. It is slidably fitted into a dead end guide hole 43 formed along the central axis of the engagement member 31 through the first urging means 40 formed of a spring. A long hole 44 is formed in the middle of the engaging member 31 along the longitudinal direction, and an engaging pin 46 fixed laterally in the middle of the guide rod 41 is slidable in the long hole 44. Is engaged. Therefore, as shown in FIGS. 6 and 8, the engaging member 31 is moved forward, that is, until the engaging pin 46 is engaged with the rear end of the elongated hole 44 by the elastic force of the first compression coil spring 40. It is urged to protrude toward the engagement member 30. A large-diameter boss portion 41a is integrally formed at a rear end of the guide rod 41 protruding rearward from the rectangular tube member 38, and an end surface of the boss portion 41a is a second urging means described later. When the second compression coil spring 54 (having a larger spring force than the first compression coil spring 40) abuts against the rear end face of the rectangular tube member 38 by the resilient force, the position of the guide member 41 is regulated. A distal end of an operating rod 48 made of a long bolt is screwed onto the boss 41a at the rear end of the guide rod 41 on the same axis as the guide rod 41, and the length is integrally adjusted via an adjusting mechanism 49. Be linked. The length adjusting mechanism 49 includes a female screw hole 49a formed in the boss portion 41a, a male screw 49b formed at one end of the operating rod 48 and screwed into the female screw hole 49a so as to be adjustable in length, and a male screw 49b. It comprises a nut 49c which is screwed into and abuts against the outer end of the boss 41a.
[0020]
As shown in FIGS. 5 and 6, the operating rod 48 extends beyond the stopper 15 to a position below the operation frame 13 on the side edge of the loading tray 8. Is slidably supported by a bearing 51 fixed to the base 36 through the support. The outer end of the sleeve 50 is expanded in a divergent shape and engages with the head of the outer end of an operating rod 48 composed of a long bolt by the elastic force of a second urging means, that is, a second compression coil spring 54. The operating rod 48 and the sleeve 50 are integrally movable outward (to the left in FIG. 6). A second urging means having a larger spring force than the first urging means 40 is provided between the spring seat 53 in which the operating rod 48 is inserted and seated on the nut 49c and the edge of the bearing 51. That is, the second compression coil spring 54 is contracted, and the second compression spring 54 projects in the direction in which the engaging member 31 protrudes through the operating rod 48 and the guide rod 41 (rightward in FIGS. 6 and 8). ).
[0021]
As shown in FIGS. 5 to 7, a lever sleeve 57 to which an operation lever 56 as an operation member extending upward is fixed integrally on the outer periphery of the sleeve 50 between the bearing 51 and the end edge of the operation rod 48. At the outer end of the base 36, a gate-shaped operation panel 58 is fixed so as to surround the operation lever 56, and the upper surface of the operation panel 58 is located on one side of the front end receiving tray 8B. It is exposed to the outside through the opening of the fixed operation frame 13, a guide groove 60 is formed on the upper surface thereof, and the operation lever 56 penetrates the guide groove 60, and the operation lever 56 passes through the opening of the operation frame 13. It can be operated from above the receiving table 8 through it. A guide groove 60 is provided for locking the operation lever 56 at a lock release position (retracting position of the engaging member 31) against the elastic force of the first and second compression coil springs 40 and 54. The operating lever 56 is locked by the resilient force of the first and second compression coil springs 40 and 54 on the one groove portion 60a and on the side opposite to the first groove 60a (the forward position of the engaging member 31). ), And a second groove 60b having an axial length allowing movement to the unlock position is formed. The second groove 60b straddles between the first groove 60a and the second groove 60b to move the operation lever 56. An inclined cam surface 60c for guiding between the grooves 60a and 60b is formed, and one end of the inclined cam surface 60c faces the second groove 60b.
[0022]
Next, the operation of the first embodiment will be described.
[0023]
Now, when the truck is in the traveling state and the receiving tray 8 is in the storage position as shown in FIG. 1, the stopper 15 provided on the receiving tray 8 is in the storage position, that is, the lying position. , Held in the locked position. That is, as shown in FIGS. 5 and 6, the operating lever 56 is located in the second groove portion 60b, and the engaging member 31 is actuated by the resilient force of the first and second compression coil springs 40, 54 and the operating rod 48 and the guide The projection is urged to the engagement position via the rod 41, and this is engaged with the engaged member 30 on the stopper 15 side, so that the stopper 15 falls down to the storage position.
[0024]
Next, when the lorry is stopped and the luggage in the packing box 2 is dropped on the ground, the packing bed 3 is raised from the stored state to the same level as the packing box 3 of the packing box 2 as shown by a solid line in FIG. Then, the front-side loading tray 8B is manually rotated to the overhang position. Next, when the operation lever 56 in the storage position is moved outward by kicking with a foot or the like, the operation lever 56 is moved toward the guide groove 60 against the elastic force of the first and second compression coil springs 40 and 54. It moves outward along the inclined cam surface 60c and engages with the first groove 60a. As a result, the operating portion rod 48 and the guide rod 41 retreat against the resilient force of the first and second compression coil springs 40 and 54, and as shown in FIG. As a result, it comes off from the engaged member 30. As described above, when the stopper 15 is held at the unlocked position, the stopper 15 pivots upward as shown by a chain line in FIG. Held in position. At this time, since the operation lever 56 is engaged with the inclined cam surface 60c of the guide groove 60, the operation lever 56 is automatically returned to the lock position by the urging force of the first and second compression coil springs 40 and 54.
[0025]
Next, the load on the loading platform 3 is transferred to a cart (not shown) and moved onto the loading platform 8, and the loading platform 8 is lowered by the operation of the loading platform lifting device L. At this time, the wheels of the cart come into contact with the engaging surfaces 15a of the protruding stoppers 15 to prevent the cart from dropping from the front end of the load receiving table 8. When the loading table 8 is lowered to the ground, the projecting stopper 15 is swung to the storage position as shown in FIG. At this time, the engaged member 30 under the stopper 15 is pressed against the inclined guide surface 31a of the engaging member 31 at the lock position (projection position), and the axial force component of the pressing force of the engaging member 31 is applied. As a result, the engaging member 31 slides in the retreating direction against the urging force of the first and second coil compression springs 40 and 54, so that when the engaged member 30 moves below the engaging member 31, The engagement member 31 released from the pressing force by the joining member 30 slides forward in the engagement direction by the urging force of the first and second compression coil springs 40 and 54, and as shown in FIG. Can be engaged. As a result, the stopper 15 becomes substantially flush with the upper surface of the loading tray 8, and the cart on the loading tray 8 can be lowered to the ground without any trouble.
[0026]
Next, when loading the luggage on the ground onto the loading platform 3 of the cargo box 2, the operating lever 56 is kicked from the base side of the loading platform 8 to the front side of the loading platform 8 to raise the operating lever 56. Rock it. Then, the operation lever 56 moves along the inclined cam surface 60c of the guide groove 60, whereby the engaging member 31 is retracted from the locked position to the unlocked position and held at that position. Thus, the stopper 15 is again held at the projecting position by the elastic force of the torsion spring 23.
[0027]
Next, the luggage on the ground is put on a cart and traveled and moved on the receiving tray 8. At this time, when the front wheel of the cart rides over the stopper 15 against the resilient force of the torsion spring 23, the stopper 15 rotates upward to the standing position again by the resilient force of the torsion spring 23, and Can be locked on the receiving table 8. This prevents the cart from returning to the ground even if the worker accidentally releases the cart.
[0028]
Further, when the cart on the receiving table 8 is pushed toward the packing box 2 and the wheel subsequently steps over the stopper 15, the stopper 15 is again held at the projecting position. Thereafter, the loading tray 8 is raised by the operation of the loading tray lifting device L until it is substantially flush with the loading tray 3, and the cart can be moved and moved on the loading tray 3. At this time, since the rear wheel of the cart is in contact with the locking surface 15a of the stopper 15, the cart is prevented from dropping from the receiving tray 8.
[0029]
When the above-described loading / unloading operation is completed, the operation lever 56 is rocked by kicking the operation lever 56 from the front side toward the base side with the foot or the like, and the operation lever 56 is moved from the inclined cam surface 60 c of the guide groove 60 to the second groove portion. The engaging rod 31 is moved from the retracted position (unlocked position) to the operating rod 48 by the urging force of the first and second compression coil springs 40 and 54, and is held at the advanced position (locked position). You. When the stopper 15 is rotated from this state to the lying down position by stepping on the stopper 15, the engaged member 30 is engaged with the engaging member 31, as shown in FIG. 6, and as shown by a solid line in FIG. The stopper 15 is held at the storage position. Then, after the stopper 15 is stored, the receiving pallet 8 is folded on the base receiving pallet 8 by the storing operation of the loading pallet lifting device L, as shown by a chain line in FIG. It is stored under the floor of box 2.
[0030]
By the way, the stopper 15 moves the engaging member 31 forward or backward by swinging and sliding operation of the operation lever 56 to disengage with the engaged member 30, and the stopper 15 falls down to the retracted position, or to the operating position. As shown in FIG. 9B, the engaging member 31 is caused to protrude due to a slight displacement between the engaging member 31 and the engaged member 30 or some other cause. In some cases, the locking member 30 may be in a semi-locked state (half-engaged state). In such a case, in the above-described conventional device, the operation lever is allowed to freely swing and slide. Therefore, when the loading tray 8 is retracted, the operation lever swings downward by its own weight, The tip is
Protruding from the receiving surface,
Although the disadvantages (1) and (2) described in the paragraph (1) occur in this embodiment, in this embodiment, the operating lever 56 is configured such that the engaging member 31 is connected to the engaged member. On the other hand, when it is in the half-locked state, it is urged in one direction by the elastic force of the second compression coil spring 54 having a larger spring force than the first compression coil spring 40, and is locked in the second groove 60b. Side, the free swinging and the sliding movement thereof are suppressed, and even when the loading tray 8 is stored, the operating lever 56 does not swing and slide by its own weight, and the leading end thereof does not move. The part does not abut against the cradle 8 to damage the cradle.
[0031]
When the loading tray of the loading tray lifting device is of the upright retractable type, the tip of the operation lever 56 does not abut against the loading box to damage the loading box.
[0032]
Next, a second embodiment of the present invention will be described.
[0033]
FIG. 10A is a sectional view of a main part of a stopper device according to a second embodiment of the present invention. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals.
[0034]
The second embodiment is different from the first embodiment in the mounting position of the second compression coil spring 54, which is the second urging means. The seat 101 is fixed, and a second compression coil spring 54 is contracted between the spring seat 101 and the operation lever 56. The resilient force of the spring 54 allows the operation lever 56 to operate regardless of the position of the engagement member 31. The guide groove 60 is urged toward the second groove portion 60b to prevent free swinging and sliding movement.
[0035]
The second embodiment has the same operation and effect as those of the first embodiment.
[0036]
Next, a third embodiment of the present invention will be described.
[0037]
FIG. 10B is a sectional view of a main part of a stopper device according to a third embodiment of the present invention. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals.
[0038]
The third embodiment is different from the first embodiment in the mounting position of the second compression coil spring 54, which is the second urging means. The seat 201 is fixed, and the second compression coil spring 54 is contracted between the spring seat 201 and the lever sleeve 57 integrated with the operation lever 56. The resilient force of the spring 54 causes the engaging member 31 to be engaged. When the member is in a semi-locked state, the operation lever 56 is urged toward the lock side of the guide groove 60 to prevent its free swinging and sliding movement.
[0039]
The third embodiment also has the same function and effect as those of the first embodiment.
[0040]
Next, a fourth embodiment of the present invention will be described.
[0041]
FIG. 10C is a sectional view of a main part of a stopper device according to a fourth embodiment of the present invention. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals.
[0042]
The fourth embodiment is different from the first embodiment in the mounting position of the second compression coil spring 54, which is the second urging means. That is, as shown in FIG. 10C, the outer cylinder 302 is fitted around the outer periphery of the square tubular member 31, and the front end thereof is engaged with the front end of the engaging member 31. A spring seat 301 is fixed to an intermediate portion of the engagement member 31, and a second compression coil spring 54 as a second urging means is contracted between the spring seat 301 and a rear end of the outer cylinder 302. . The second compression coil spring 54 urges the engaging member 31 in the protruding direction and engages the operation lever 56 with the second groove portion 60b to prevent free swinging and sliding movement. The same operation and effect as those of the first to third embodiments are obtained.
[0043]
Next, a fifth embodiment of the present invention will be described.
[0044]
FIGS. 11D and 11E show a fifth embodiment of the present invention. FIG. 11D is a sectional view of a main part of the stopper device, and FIG. 11E is FIG. 11D. FIG. 3 is a sectional view taken along line ee of FIG. 3, and the same components as those in the first embodiment are denoted by the same reference numerals.
[0045]
In the fifth embodiment, a torsion spring is used as the second urging means 54. One of the torsion springs 54 as the second urging means wound around an intermediate portion of the operating rod 48 is used. One end is engaged with the base 36, and the other end is engaged with one end of a sleeve 50 integrated with the operation lever 56. The resilient force of the torsion spring 54 urges the operation lever 56 through the sleeve 50 toward the second groove 60b of the guide groove 60 to prevent free swing and sliding movement of the operation lever 56. The same operation and effect as those of the fourth embodiment are obtained.
[0046]
Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.
[0047]
For example, although the description has been given of the receiving platform of the loading platform lifting device, the receiving platform may be of an upright retractable type, a vertical lifting type, or another type. The mounting position of the second urging means may be anywhere in a range not deviating from its function, in addition to the first to fourth embodiments, and the first and second urging means may be compressed. In addition to coil springs and torsion springs, conventionally known ones having the same effect can be used.
[0048]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the loading / unloading device for a vehicle, the engagement member on the loading tray may be half-locked with the engaged member on the stopper. The operating member for operating the engaging member is restricted from swinging freely, so that the tip of the operating member does not come into contact with the packing box or the receiving table when the receiving table is stored. In this way, it is possible to prevent the packing box and the receiving table from being damaged.
[Brief description of the drawings]
FIG. 1 is a rear side view of a lorry equipped with the apparatus of the present invention (first embodiment).
FIG. 2 is a plan view of FIG.
FIG. 3 is an enlarged view, partly broken away, of a portion surrounded by a virtual line as seen from the arrow 3 in FIG.
FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;
FIG. 5 is a partially broken enlarged view of a portion surrounded by an imaginary line as viewed from arrow 5 in FIG. 2;
FIG. 6 is a sectional view taken along the line 6-6 in FIG. 5;
FIG. 7 is a sectional view taken along lines 7-7 in FIG. 5;
FIG. 8 is a sectional view taken along line 8-8 in FIG. 6;
FIG. 9 is a sectional view showing the operation of the stopper device.
FIG. 10 is a sectional view of a main part of a stopper device (second, third, and fourth embodiments).
FIG. 11 is a cross-sectional view of a main part of a stopper device and a cross-sectional view thereof along a line ee (fifth embodiment).
FIG. 12 is a sectional view showing a locked state and an unlocked state of a conventional stopper device.
FIG. 13 is a cross-sectional view showing a half-locked state of a conventional stopper device.
[Explanation of symbols]
1 ... body
2 ......... packing box
3 ......... loading platform
8 ・・・・・・ Receiving stand
15 ・・・・・・・ Stopper
21... Urge means (spring means)
24 ・・・・・・・ Friction pad
30... Engaged member
31 ..... engaging member
40... First biasing means (first compression coil spring)
54 second biasing means (second compression coil spring)
56 ······· Operation member (operation lever)
60 ········· Guide means (guide groove)
LO ······ Lock means

Claims

A loading table (8) is provided on a vehicle body (1) on which the loading box (2) is mounted via a lifting mechanism so as to be able to move up and down, and the loading table (8) is in a horizontal state. ) And lift between the ground,
In addition, in the vehicle loading / unloading device, the loading tray (8) may be folded and stored under the floor of the loading box (2) or may be stored upright along the loading box (2).
The receiving table (8) is held at a storage position substantially flush with the receiving surface and at a projecting position protruding from the receiving surface, and is urged to the projecting position by an urging means (21). 15) and locking means (LO) for locking or unlocking the stopper (15) at the storage position,
The locking means (LO) is provided on the stopper (15) side and is provided on the loading table (8) side so as to be able to engage and disengage with the engaged member (30). An engagement member (31) slidable to a lock side and an unlock side; first urging means (40) for urging the engagement portion (31) toward the lock side; 8) an operating member (56) pivotably supported by the engaging member (31) so as to be pivotable by the engaging member (31), and the engaging member (31) in association with the swing operation of the operating member (56). And a second urging means (54) which urges the operation member (56) to the lock side and has a larger urging force than the first urging means (40). And
The second biasing means (54) biases the operating member (56) toward the lock side when the engaging member (31) is in a semi-locked state with respect to the engaged member (30). The free swing and slide movement are restricted to prevent the tip of the operating member (56) from protruding from the receiving surface of the receiving table (8) when the receiving table (8) is stored. A stopper device in a loading / unloading device of a vehicle.