JP6161159B2 - Loading platform lifting device - Google Patents

Loading platform lifting device Download PDF

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JP6161159B2
JP6161159B2 JP2013225700A JP2013225700A JP6161159B2 JP 6161159 B2 JP6161159 B2 JP 6161159B2 JP 2013225700 A JP2013225700 A JP 2013225700A JP 2013225700 A JP2013225700 A JP 2013225700A JP 6161159 B2 JP6161159 B2 JP 6161159B2
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load receiving
plate
stopper
plates
guide surface
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JP2015085789A (en
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英樹 清藤
英樹 清藤
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Kyokuto Kaihatsu Kogyo Co Ltd
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Kyokuto Kaihatsu Kogyo Co Ltd
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Description

本発明は、支持体、例えば荷役車両の車体に昇降機構を介して取付けられる荷受台が、その昇降機構に駆動されて地面と荷台との間を昇降作動可能である荷受台昇降装置に関する。   The present invention relates to a load receiving platform lifting apparatus in which a support, for example, a load receiving base attached to a vehicle body of a cargo handling vehicle via a lifting mechanism is driven by the lifting mechanism and can be moved up and down between the ground and the loading platform.

上記荷受台昇降装置として、例えば、荷受台を、上面を荷受け面とした複数のプレートで分割構成すると共に、その複数のプレートを、それらが略水平に一列に並んだ展開状態と、上下に重なり合う折り畳み状態とをとり得るように相互にヒンジ連結して、不使用時に荷受台を折り畳むことでコンパクト化できるようにし、さらに荷受台先部を構成する第1プレートに、荷受け面に対し略面一となる格納位置と荷受け面より突出した突出位置との間で回動可能なストッパを軸支すると共に、そのストッパを突出位置及び格納位置にロックし得るロック機構をストッパと第1プレート間に設け、突出位置のストッパによって、荷物やキャスタ付きカートが荷受台から転落するのを防止できるようにしたものが知られている(下記特許文献1を参照)。   As the load receiving platform lifting device, for example, the load receiving platform is divided and configured with a plurality of plates having the upper surface as the load receiving surface, and the plurality of plates overlap vertically with the unfolded state in which they are aligned substantially horizontally. The hinges are connected to each other so that they can be folded, so that the cargo cradle can be folded when not in use, and the first plate constituting the cargo cradle tip is substantially flush with the load receiving surface. A stopper is provided between the stopper and the first plate so that the stopper can be pivoted between the retracted position and the protruding position protruding from the load receiving surface, and the stopper can be locked at the protruding position and the retracted position. It is known that a stopper at a protruding position can prevent a load or a cart with casters from falling from a load receiving table (see Patent Document 1 below). ).

特開2004−90876号公報JP 2004-90876 A

ところが上記従来装置では、荷受台を用いた荷物の積み降ろし作業の終了後に、作業者がストッパを格納し忘れて(即ち突出位置に保持したまま)荷受台の折り畳み操作をしてしまう場合がある。この場合、その折り畳みのために前記第1プレートをこれと隣接する第2プレートの荷受け面上に重ね合わせる操作の途中で、ストッパが両プレート間に突っ張り棒のように作用してしまい、両プレートを十分に近接させて重ね合わせた完全な折り畳み状態が得られなくなる。にも拘わらず、その中途半端な折り畳み状態で荷受台の折り畳み操作を無理に続行しようとすると、ストッパや荷受台の一部が破損する虞れがあり、また、その中途半端な折り畳み状態のまま荷受台を車体の所定の格納位置まで移動させようとした場合には、その不完全な折り畳み状態の荷受台が荷受台昇降装置の固定側部材、或いは車体と接触して破損する虞れがあった。   However, in the above-described conventional apparatus, there is a case where the operator forgets to store the stopper after the loading / unloading operation using the load receiving table is completed (that is, the holding table is held in the protruding position) and the folding operation of the load receiving table is performed. . In this case, in the middle of the operation of overlapping the first plate on the load receiving surface of the second plate adjacent to the first plate for folding, the stopper acts like a tension rod between the two plates. It is impossible to obtain a completely folded state in which the two are sufficiently close to each other. Nevertheless, if you try to forcefully continue the folding operation of the cargo cradle in the halfway folded state, there is a risk that the stopper and part of the cradle may be damaged, and the halfway folded state remains. When trying to move the load receiving table to a predetermined storage position of the vehicle body, the incompletely folded load receiving table may be damaged by coming into contact with the fixed side member of the load receiving device lifting device or the vehicle body. It was.

本発明は、上記に鑑み提案されたもので、従来装置の前記問題を簡単な構造で解決できるようにした荷受台昇降装置を提供することを目的とする。   The present invention has been proposed in view of the above, and it is an object of the present invention to provide a cargo receiving platform lifting device that can solve the above-described problems of conventional devices with a simple structure.

前記目的を達成するために、請求項1の発明は、支持体に昇降機構を介して取付けた荷受台が、該昇降機構に駆動されて地面と荷台間を昇降作動可能である荷受台昇降装置であって、前記荷受台が、上面を荷受け面とした複数のプレートより分割構成され、その複数のプレートは、それらが略水平に一列に並んだ展開状態と、上下に重なり合う折り畳み状態とをとり得るように相互にヒンジ連結され、前記複数のプレートのうち荷受台先部を構成する第1プレートには、その第1プレートの荷受け面に対し略面一となる格納位置と同荷受け面より突出した突出位置との間で回動可能なストッパが軸支されると共に、そのストッパを前記突出位置に付勢する付勢手段が該ストッパと第1プレート間に設けられるものにおいて、前記第1プレートに隣接する第2プレートには、前記荷受台を折り畳むために該第2プレートの荷受け面上に第1プレートを重ね合わせる操作の途中で、前記突出位置の前記ストッパに係合して該ストッパを前記付勢手段に抗して前記格納位置まで誘導するガイド面が設けられることを特徴とする。   In order to achieve the above-mentioned object, the invention according to claim 1 is directed to a load receiving platform lifting apparatus in which a load receiving base attached to a support body via a lifting mechanism is driven by the lifting mechanism and can be moved up and down between the ground and the loading platform. The load receiving platform is divided into a plurality of plates having an upper surface as a load receiving surface, and the plurality of plates are in an unfolded state in which they are arranged in a line in a substantially horizontal manner and a folded state in which they are vertically overlapped. The first plate, which is hinged to each other so as to form the load receiving base portion of the plurality of plates, protrudes from the load receiving surface that is substantially flush with the load receiving surface of the first plate. A stopper that is pivotable between the protruding position and an urging means that urges the stopper to the protruding position is provided between the stopper and the first plate. The adjacent second plate is engaged with the stopper at the protruding position during the operation of overlapping the first plate on the load receiving surface of the second plate in order to fold the load receiving table. A guide surface that guides to the retracted position against the urging means is provided.

また請求項2の発明は、請求項1の発明の前記特徴に加えて、前記ガイド面は、前記操作の途中で前記ストッパが該ガイド面に接触した時点から前記操作が終了するまでの間、前記接触による摩擦抵抗および前記付勢手段の付勢力に抗して前記ストッパを前記格納位置側に回動させる回動モーメントを生じさせる形状に形成されることを特徴とする。   Further, the invention of claim 2 is characterized in that, in addition to the feature of the invention of claim 1, the guide surface is between the point in time during which the stopper contacts the guide surface and the operation is completed. It is formed in the shape which produces the rotation moment which rotates the stopper to the storage position side against the frictional resistance by the contact and the urging force of the urging means.

また請求項3の発明は、請求項1又は2の発明の前記特徴に加えて、前記複数のプレートのうち少なくとも第2プレートの荷受け面には滑り止め用の凹凸部が形成され、前記ガイド面を有するガイド部材が、前記凹凸部の凸部分よりも高い位置に前記ガイド面を位置させるようにして前記第2プレートの荷受け面上に装着されることを特徴とする。   According to a third aspect of the present invention, in addition to the feature of the first or second aspect of the present invention, an anti-slip uneven portion is formed on at least a load receiving surface of the second plate among the plurality of plates, and the guide surface A guide member having a protrusion is mounted on the load receiving surface of the second plate so that the guide surface is positioned higher than the convex portion of the concavo-convex portion.

また請求項4の発明は、請求項1〜3の何れかの発明の前記特徴に加えて、前記第1プレートの荷受け面には、前記格納位置の前記ストッパを受容する凹部が形成され、前記ガイド面を有するガイド部材が前記第2プレートの荷受け面上に突設され、前記ガイド部材の先部は、前記荷受台が折り畳み状態にあるときに、前記ストッパに設けた切欠き又は貫通孔を通して前記凹部に受容されることを特徴とする。   According to a fourth aspect of the present invention, in addition to the above feature of any of the first to third aspects, a recess for receiving the stopper at the storage position is formed on the load receiving surface of the first plate, A guide member having a guide surface protrudes on the load receiving surface of the second plate, and the front portion of the guide member passes through a notch or a through hole provided in the stopper when the load receiving base is in a folded state. It is received in the recess.

本発明によれば、荷受台先部を構成する第1プレートに隣接する第2プレートに、荷受台を折り畳むために第2プレートの荷受け面上に第1プレートを重ね合わせる操作の途中で、ストッパに係合してストッパを付勢手段に抗して格納位置まで誘導するガイド面が設けられるので、荷受台の折り畳み操作(特に第1,第2プレート相互の折り重ね操作)に連動して、ストッパを突出位置から格納位置まで自動的に格納動作させることができる。従って、その荷受台の折り畳み操作の途中で突出位置のストッパが両プレート間に突っ張り棒のように作用して中途半端な折り畳み状態となってしまう事態の発生を未然に確実に回避できるため、その状態のまま荷受台を更に折り畳み操作したり或いは車体への格納操作を行った場合にストッパや荷受台が破損するのを効果的に防止することができる。   According to the present invention, in the middle of the operation of superimposing the first plate on the load receiving surface of the second plate in order to fold the load receiving table on the second plate adjacent to the first plate that constitutes the load receiving tip portion, Since a guide surface that guides the stopper to the retracted position against the biasing means is provided, in conjunction with the folding operation of the load receiving table (particularly the folding operation between the first and second plates), The stopper can be automatically retracted from the protruding position to the retracted position. Therefore, since the stopper at the protruding position acts like a tension rod between both plates during the folding operation of the load receiving table, it is possible to reliably avoid the occurrence of a halfway folded state beforehand. It is possible to effectively prevent the stopper and the load receiving table from being damaged when the load receiving table is further folded or stored in the vehicle body.

また特に請求項2の発明によれば、上記ガイド面は、第2プレートの荷受け面上に第1プレートを重ね合わせる操作の途中でストッパがガイド面に接触した時点から前記操作が終了するまでの間、前記接触による摩擦抵抗および付勢手段の付勢力に抗してストッパを格納位置側に回動させる回動モーメントを生じさせる形状に形成されるので、上記操作の途中でストッパにガイド面が接触した時点から前記操作が終了するまでの間、ストッパの回動方向を第1ガイド面で確実に格納位置方向へ規定できて、ストッパを前記操作に連動して確実に格納動作させることができる。   Further, according to the invention of claim 2, the guide surface may extend from the time when the stopper contacts the guide surface during the operation of superimposing the first plate on the load receiving surface of the second plate until the operation is completed. During the above operation, the guide surface is formed on the stopper in the middle of the above operation because it is formed in a shape that generates a rotational moment that rotates the stopper toward the retracted position side against the frictional resistance due to the contact and the biasing force of the biasing means. From the time of contact until the operation is completed, the rotation direction of the stopper can be reliably defined by the first guide surface toward the storage position, and the stopper can be reliably stored in conjunction with the operation. .

また特に請求項3の発明によれば、少なくとも第2プレートの荷受け面には滑り止め用の凹凸部が形成され、前記ガイド面を有するガイド部材が、前記凹凸部の凸部分よりも高い位置にガイド面を位置させるようにして第2プレートの荷受け面上に装着されるので、第2プレートの荷受け面に滑り止め用の凹凸が付されていても、その凹凸にストッパが引っ掛かって格納位置側へ回動しなくなる事態を効果的に防止できる。   In particular, according to the invention of claim 3, at least the load receiving surface of the second plate is provided with an uneven portion for preventing slippage, and the guide member having the guide surface is positioned higher than the convex portion of the uneven portion. Since it is mounted on the load receiving surface of the second plate so that the guide surface is positioned, even if the load receiving surface of the second plate has unevenness for preventing slipping, the stopper is caught by the unevenness and the storage position side It is possible to effectively prevent the situation where the motor does not rotate.

また特に請求項4の発明によれば、第1プレートの荷受け面には、格納位置のストッパを受容する凹部が形成され、ガイド部材が第2プレートの荷受け面上に突設されても、このガイド部材の先部は、荷受台が折り畳み状態にあるときにストッパの切欠き又は貫通孔を通して第1プレートの前記凹部に受容されるので、ガイド部材の先部が第2プレートの荷受け面上に少なからず突出しても、その突出部分を、荷受台の折り畳み状態でストッパを通して第1プレート内に支障なく収めることができ、折り畳み状態の荷受台のコンパクト化が図られる。   In particular, according to the invention of claim 4, a recess for receiving the stopper at the storage position is formed on the load receiving surface of the first plate, and even if the guide member protrudes on the load receiving surface of the second plate, Since the tip of the guide member is received in the concave portion of the first plate through the notch or the through hole of the stopper when the load receiving base is in the folded state, the tip of the guide member is on the load receiving surface of the second plate. Even if it protrudes not a little, the protruding part can be stored in the first plate through the stopper without any trouble in the folded state of the load receiving table, and the folded load receiving table can be made compact.

本発明の荷受台昇降装置を備えた荷役車両の第1実施形態を示す要部側面図The principal part side view which shows 1st Embodiment of the cargo handling vehicle provided with the cargo receiving stand raising / lowering apparatus of this invention. 図1の2矢視から見た前記荷受台昇降装置の斜視図The perspective view of the said cargo receiving stand raising / lowering apparatus seen from 2 arrow view of FIG. 図1の矢視部の拡大側面図1 is an enlarged side view of the portion indicated by the arrow in FIG. 前記荷受台昇降装置の要部底面図(図3の4矢視図)3 is a bottom view of the main part of the cargo receiving platform lifting device (viewed in the direction of arrow 4 in FIG. 3). 図4の5−5線拡大断面図FIG. 4 is an enlarged sectional view taken along line 5-5. 荷受台第1プレートの第2プレートに対する折り畳み操作過程を示す、図5対応断面図であって、(A)はストッパがガイド面に接触開始した時点の状態を、また(B)はストッパが格納位置に達した時点の状態をそれぞれ示すFIG. 6 is a cross-sectional view corresponding to FIG. 5 showing a folding operation process of the first plate of the load receiving table with respect to the second plate, in which (A) shows the state when the stopper starts to contact the guide surface, and (B) shows that the stopper is stored. Indicates the state when the position is reached ストッパがガイド面に案内されて突出位置から格納位置まで移動する過程を示す動作説明図Operation explanatory diagram showing a process in which the stopper is guided by the guide surface and moves from the protruding position to the retracted position. 図4の8−8線拡大断面図FIG. 4 is an enlarged sectional view taken along line 8-8. 荷受台が格納位置から接地展開位置まで移動する過程を説明した動作説明図であって、(A)は折り畳み状態の荷受台が格納位置にある状態を、(B)は折り畳み状態の荷受台が後方張出位置にある状態を、(C)は荷受台を下降させて第3プレートを接地させた状態をそれぞれ示すIt is operation | movement explanatory drawing explaining the process in which a load receiving stand moves from a storage position to a ground deployment position, Comprising: (A) is a state in which the load receiving stand of a folding state exists in a storage position, (B) is the load receiving stand of a folding state. (C) shows a state in which the third plate is grounded by lowering the load receiving platform. 荷受台が格納位置から接地展開位置まで移動する過程を説明した動作説明図であって、(D)は第3プレートに対し第2プレートを回動させて接地させた状態を、(E)は第2プレートに対し第1プレートを回動させて接地させた状態をそれぞれ示すIt is operation | movement explanatory drawing explaining the process in which a receiving stand moves from a storage position to a ground deployment position, (D) is the state which rotated the 2nd plate with respect to the 3rd plate, and grounded, (E) A state where the first plate is rotated and grounded with respect to the second plate is shown. 本発明の第2実施形態を示す図6対応図FIG. 6 correspondence diagram showing the second embodiment of the present invention.

本発明の実施の形態を、添付図面により以下に具体的に説明する。   Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

この実施の形態は、本発明に係る荷受台昇降装置を荷箱付き荷役車両に実施したものである。   In this embodiment, the load receiving platform lifting apparatus according to the present invention is applied to a cargo handling vehicle with a cargo box.

先ず、第1実施形態を示す図1〜図10において、荷役車両Vの車体枠F上には、後面開放の荷箱Nが架装されており、この荷箱Nの後部直下の車体枠Fには、本発明に係る荷受台昇降装置Aが取付けられる。この荷受台昇降装置Aは、荷受台Dと、これを昇降駆動し得る平行リンク式の昇降機構Lとより構成されており、この昇降機構Lにより荷受台Dは、荷箱床面で構成される荷台Naと地面Eとの間で、略水平姿勢を保ちつつ昇降作動可能である。そして、荷受台Dの昇降作動により、荷受台1上に載置した荷物やキャスター付きカートを、地面Eと荷台Na間でスムーズに積み降ろしできるようになっている。   First, in FIGS. 1 to 10 showing the first embodiment, a cargo box N with an open rear surface is mounted on the vehicle body frame F of the cargo handling vehicle V, and the vehicle body frame F just below the rear part of the cargo box N is mounted. The load receiving platform lifting apparatus A according to the present invention is attached. The load receiving platform lifting / lowering device A is composed of a load receiving platform D and a parallel link type lifting / lowering mechanism L that can drive the lifting / lowering of the load receiving platform D. By this lifting / lowering mechanism L, the load receiving platform D is formed of a cargo box floor. It is possible to move up and down while maintaining a substantially horizontal posture between the loading platform Na and the ground E. And by the raising / lowering operation | movement of the load receiving stand D, the load placed on the load receiving stand 1 and the cart with a caster can be smoothly loaded / unloaded between the ground E and the loading platform Na.

前記昇降機構Lは、荷受台Dをコンパクトに折り畳んだ状態で荷箱床下の所定の格納位置に格納可能であると共に、その格納位置から後方に荷受台Dを張出し展開させた状態で、荷受台Dを、地面Eに接続可能な下限位置と、荷台Naに接続可能な上限位置との間で昇降駆動可能である。   The lifting mechanism L can be stored in a predetermined storage position below the floor of the cargo box with the load receiving table D folded in a compact manner, and the load receiving table D can be extended rearward from the storage position. D can be driven up and down between a lower limit position connectable to the ground E and an upper limit position connectable to the cargo bed Na.

次に前記昇降機構Lの具体的構造を説明するに、それは、荷箱床下の車体枠Fに結合される固定枠1と、その固定枠1に固定されて前後方向に延びるガイドレール2と、そのガイドレール2に所定の制限された摺動範囲内で前後摺動可能に支持される可動枠3と、その可動枠3に荷受台Dの基部(即ち後述する第3フレームD3)を昇降回動可能に案内支持する上下一対の第1,第2リンクアーム4,5と、可動枠3をガイドレール2に沿って前後駆動すべく可動枠3及び固定機枠1間に介装した前後駆動用シリンダC1と、可動枠3が後退限(即ち後方張出位置)に在る状態で荷受台Dを昇降駆動するための昇降用シリンダC2とを備える。   Next, a specific structure of the elevating mechanism L will be described. It includes a fixed frame 1 coupled to the vehicle body frame F under the cargo box floor, a guide rail 2 fixed to the fixed frame 1 and extending in the front-rear direction. A movable frame 3 supported by the guide rail 2 so as to be slidable back and forth within a predetermined limited sliding range, and a base portion of a load receiving table D (that is, a third frame D3 described later) is moved up and down on the movable frame 3. A pair of upper and lower first and second link arms 4 and 5 that are movably guided and supported, and a front and rear drive interposed between the movable frame 3 and the fixed machine frame 1 to drive the movable frame 3 back and forth along the guide rail 2 And a lifting cylinder C2 for driving the load receiving table D up and down while the movable frame 3 is in the retreat limit (that is, the rearward projecting position).

前記可動枠3には、補助リンク6の上端が所定の回動範囲内で前後回動可能に軸支6aされており、その補助リンク6に第1リンクアーム4及び昇降用シリンダC2の各前端が枢支連結され、また第2リンクアーム5の前端が可動枠3に枢支連結される。また昇降用シリンダC2の後端は第1リンクアーム4の中間部に、また第1,第2リンクアーム4,5の各後端が荷受台Dの基部D3にそれぞれ枢支連結される。そして、補助リンク6は、通常は荷受台Dの自重に基づき可動枠3に対し所定位置に保持されるため、第1,第2リンクアーム4,5が平行リンク機構PLの上下一対のリンクアームを構成する。従って、その両リンクアーム4,5の後端に基部D3が枢支連結される荷受台Dは、昇降用シリンダC2の伸縮作動に連動して、水平姿勢を保ちつつ前記下限位置と上限位置間を昇降可能である。尚、可動枠3又は車体枠Fと、平行リンク機構PLとの間には、荷受台Dの上限位置を規定するストッパ手段(図示せず)が設けられる。   The movable frame 3 is pivotally supported at the upper end of an auxiliary link 6 so as to be able to rotate back and forth within a predetermined rotation range. The front end of each of the first link arm 4 and the lifting cylinder C2 is supported by the auxiliary link 6. Are pivotally connected, and the front end of the second link arm 5 is pivotally connected to the movable frame 3. The rear end of the lifting cylinder C2 is pivotally connected to the intermediate portion of the first link arm 4, and the rear ends of the first and second link arms 4 and 5 are pivotally connected to the base D3 of the load receiving platform D, respectively. Since the auxiliary link 6 is normally held at a predetermined position with respect to the movable frame 3 based on the weight of the load receiving platform D, the first and second link arms 4 and 5 are a pair of upper and lower link arms of the parallel link mechanism PL. Configure. Accordingly, the load receiving platform D, whose base D3 is pivotally connected to the rear ends of the link arms 4 and 5, is linked between the lower and upper limit positions while maintaining a horizontal posture in conjunction with the expansion and contraction operation of the elevating cylinder C2. Can be moved up and down. Note that stopper means (not shown) for defining the upper limit position of the load receiving platform D is provided between the movable frame 3 or the vehicle body frame F and the parallel link mechanism PL.

前記前後駆動用シリンダC1のシリンダ本体は、可動枠3に取付けられて後方に延びるシリンダ支持部材7に固定されており、このシリンダ支持部材7の後端部には、折り畳み状態の荷受台Dをガイドするためのガイドローラ8が回転自在に設けられる。そして、前後駆動用シリンダC1は、これのピストンロッドが固定枠1に連結されており、該シリンダC1の伸縮作動により可動枠3が前方格納位置と後方張出位置との間を往復動可能である。そして、荷受台Dは、それが後述するようにコンパクトに折り畳まれた状態で可動枠3を前方格納位置まで移動させることで、所定の折り畳み格納状態となる。   The cylinder body of the front / rear drive cylinder C1 is fixed to a cylinder support member 7 that is attached to the movable frame 3 and extends rearward. A folded load receiving platform D is provided at the rear end of the cylinder support member 7. A guide roller 8 for guiding is rotatably provided. The front and rear drive cylinder C1 has its piston rod connected to the fixed frame 1, and the movable frame 3 can reciprocate between a front retracted position and a rearwardly extended position by the expansion and contraction of the cylinder C1. is there. And the receiving stand D will be in a predetermined folding storage state by moving the movable frame 3 to a front storage position in the state folded compactly so that it may mention later.

前記荷受台Dは、上面が荷受け面Df1〜Df3となる複数のプレートD1〜D3より分割構成されており、その複数のプレートD1〜D3は、それらが略水平に一列に並んだ展開状態と、上下に折り重なり合う折り畳み状態とをとり得るように相互にヒンジ連結H1,H2される。そして、相隣なるプレートD1,D2;D2,D3の隣接端部の相互間には、それらプレート相互が前記した略水平の展開状態にある時にそれ以上下方に屈折回動しないよう相対回動限界を規定する回動規制手段32,33がそれぞれ設けられる。   The load receiving platform D is divided and configured from a plurality of plates D1 to D3 whose upper surfaces are load receiving surfaces Df1 to Df3, and the plurality of plates D1 to D3 are in an unfolded state in which they are aligned in a substantially horizontal line, The hinges H1 and H2 are connected to each other so that they can be folded up and down. And between the adjacent ends of the adjacent plates D1, D2; D2, D3, the relative rotation limit is set so that the plates do not rotate further downward when they are in the substantially horizontal unfolded state described above. Rotation restricting means 32, 33 for defining

また各プレートD1〜D3の裏面適所には、それらプレートD1〜D3と実質的に一体となる補強用リブが各々固着される。更に第1,第2プレートD1,D2の裏面(前記補強用リブ)には、接地時の衝撃吸収のためのパッド35,36がそれぞれ突設される。   Reinforcing ribs that are substantially integrated with the plates D1 to D3 are fixed to appropriate positions on the back surfaces of the plates D1 to D3, respectively. Further, pads 35 and 36 for absorbing shocks at the time of grounding project from the back surfaces (reinforcing ribs) of the first and second plates D1 and D2, respectively.

前記複数のプレートD1〜D3のうち荷受台先部を構成する第1プレートD1と、荷受台中間部を構成する第2プレートD2との間のヒンジ連結部H1は、その両プレートD1,D2間に跨がる中間ヒンジ部材10と、その中間ヒンジ部材10の一側端と第1プレートD1の基端との間を枢支連結する第1枢軸11と、その中間ヒンジ部材10の他側端と第2プレートD2の先端との間を枢支連結する第2枢軸12とで構成される。第1プレートD1と中間ヒンジ部材10との間には、その相互間の相対回動限界(即ち屈折限界)を規定する第1規制手段13が、また第2プレートD2と中間ヒンジ部材10との間には、その相互間の相対回動限界(即ち屈折限界)を規定する第2規制手段14がそれぞれ設けられる。   Among the plurality of plates D1 to D3, the hinge connecting portion H1 between the first plate D1 constituting the load receiving base and the second plate D2 constituting the load receiving intermediate portion is between the plates D1 and D2. An intermediate hinge member 10 that straddles the first hinge shaft 10 that pivotally connects between one end of the intermediate hinge member 10 and the base end of the first plate D1, and the other end of the intermediate hinge member 10 And a second pivot 12 that pivotally connects between the second plate D2 and the tip of the second plate D2. Between the 1st plate D1 and the intermediate hinge member 10, the 1st control means 13 which prescribes | regulates the relative rotation limit (namely, refraction | limitation limit) between them is also between the 2nd plate D2 and the intermediate hinge member 10. Between them, the second restricting means 14 for defining the relative rotation limit (that is, the refraction limit) between them is provided.

また、荷受台基部を構成する第3プレートD3と、前記第2プレートD2との間のヒンジ連結部H2は、その両プレートD2,D3間に跨がる帯板状の中間ヒンジ部材16と、その中間ヒンジ部材13の一側端と第2プレートD2の基端との間を枢支連結する第3枢軸17と、その中間ヒンジ部材13の他側端と第3プレートD3の先端との間を枢支連結する第4枢軸18とで構成される。   Further, the hinge connecting portion H2 between the third plate D3 constituting the load receiving base and the second plate D2 has a belt-like intermediate hinge member 16 straddling between the plates D2 and D3, A third pivot 17 that pivotally connects between one side end of the intermediate hinge member 13 and the base end of the second plate D2, and between the other side end of the intermediate hinge member 13 and the tip of the third plate D3. And a fourth pivot 18 for pivotally connecting the two.

而して、第1プレートD1は、それの荷受け面Df1が第2プレートD2の荷受け面Df2上に対面、近接するよう上下に折り畳むことができ、さらにその折り畳んだ第1,第2プレートD1,D2の重合体を、第3プレートD3の荷受け面Df3上に対面、近接するよう上下に折り畳むことで、荷受台Dの完全な折り畳み状態が得られるようになっている。尚、第1プレートD1の先部には、上記折り畳みの際に作業者が持ち上げ操作し易いように可撓性の把手40が、また第2プレートD2の少なくとも一側部には、上記折り畳みの際に作業者が持ち上げ操作し易いように剛直な把手41がそれぞれ設けられていて、折り畳み作業の利便性が図られる。   Thus, the first plate D1 can be folded up and down so that its load receiving surface Df1 faces and is close to the load receiving surface Df2 of the second plate D2, and the folded first and second plates D1, The polymer of D2 is folded up and down on the load receiving surface Df3 of the third plate D3 so as to face and approach each other, so that the fully folded state of the load receiving platform D can be obtained. In addition, a flexible handle 40 is provided at the tip of the first plate D1 so that the operator can easily lift it during the folding, and at least one side of the second plate D2 is provided with the folding. At this time, each of the rigid handles 41 is provided so that the operator can easily lift and operate, so that the convenience of the folding work is achieved.

図5及び図6により具体的に示されるように、第1プレートD1には、それの荷受け面Df1に対し略面一となる格納位置SBと同荷受け面Dfより突出した突出位置SAとの間で回動可能なストッパSが軸支されており、このストッパSは、荷受台Dを横切るようにその横幅、略一杯に亘り延びる帯板状に形成される。また第1プレートD1の荷受け面Df1には、格納位置SBのストッパSを受容する溝状の凹部21が形成される。そして、ストッパSの先部裏面には、ストッパSが前記格納位置SBに達したときに(図6の(B)を参照)、これを前記凹部21の内面に緩衝的に当接させるための緩衝パッド34が装着される。   As specifically shown in FIGS. 5 and 6, the first plate D1 includes a storage position SB that is substantially flush with the load receiving surface Df1 and a protruding position SA that protrudes from the load receiving surface Df. A stopper S that can be rotated is supported by a shaft, and the stopper S is formed in a strip shape extending across the width and substantially the width so as to cross the load receiving table D. Further, a groove-like recess 21 for receiving the stopper S at the storage position SB is formed on the load receiving surface Df1 of the first plate D1. And when the stopper S reaches the storage position SB (refer to FIG. 6B), the front surface of the front portion of the stopper S is used for buffering the stopper S against the inner surface of the recess 21. A buffer pad 34 is attached.

そのストッパSと第1プレートD1との間には、ストッパSを突出位置SA側に付勢する付勢手段としてのばね20と、そのばね20の付勢力に抗してストッパSを突出位置SAに保持すべくストッパSの上方回動限界を規定する回動規制手段22とが介装される。そして、本実施形態では、前記付勢手段としての捩りコイルばね20が第1プレートD1の前記凹部21に収容される。この捩りコイルばね20は、これに捩じり反力を蓄えた状態で、それの一端がストッパSの裏面に、またその他端が前記凹部21の内面にそれぞれ係合しており、その中間コイル部分には、保形用のバネ支持軸23が嵌挿、保持されている。   Between the stopper S and the first plate D1, a spring 20 as an urging means for urging the stopper S toward the projecting position SA, and the stopper S against the urging force of the spring 20 is disposed at the projecting position SA. A rotation restricting means 22 for defining the upper rotation limit of the stopper S is interposed. In this embodiment, the torsion coil spring 20 as the urging means is accommodated in the recess 21 of the first plate D1. The torsion coil spring 20 stores a torsional reaction force, and has one end engaged with the back surface of the stopper S and the other end engaged with the inner surface of the recess 21. A spring retaining shaft 23 for shape retention is fitted and held in the portion.

またストッパSの基端には、横断面円弧(特に優弧)状の軸受ボス部24が一体に連設され、その軸受ボス部24に回動可能に嵌合される膨大軸部25aを先端に有する支持突起25が前記凹部22の内面に一体に突設される。そして、その支持突起25の基部に軸受ボス部24の一対の外端がそれぞれ係合することで、ストッパSの回動限界が規定され、即ち、支持突起25及び軸受ボス部24が互いに協働して前記回動規制手段22を構成する。   Further, the base end of the stopper S is integrally provided with a bearing boss portion 24 having a cross-sectional arc (particularly a superior arc) shape, and a huge shaft portion 25a that is rotatably fitted to the bearing boss portion 24 is provided at the tip end. The support protrusion 25 is integrally provided on the inner surface of the recess 22. The pair of outer ends of the bearing boss portion 24 are engaged with the base portion of the support protrusion 25, respectively, so that the rotation limit of the stopper S is defined. That is, the support protrusion 25 and the bearing boss portion 24 cooperate with each other. Thus, the rotation restricting means 22 is configured.

また第1プレートD1に隣接する第2プレートD2には、荷受台Dを折り畳むために第2プレートD2の荷受け面Df2上に第1プレートD1を重ね合わせる操作(以下、単に「重ね合わせ操作」という)の途中で、突出位置SAのストッパSに係合してストッパSをばね20の付勢力に抗して格納位置SBまで誘導するガイド面Gfが設けられる。   In addition, an operation for superimposing the first plate D1 on the load receiving surface Df2 of the second plate D2 in order to fold the load receiving platform D (hereinafter simply referred to as “superimposition operation”) is performed on the second plate D2 adjacent to the first plate D1. ), A guide surface Gf that engages with the stopper S at the protruding position SA and guides the stopper S to the retracted position SB against the biasing force of the spring 20 is provided.

そのガイド面Gfを有する左右一対のガイド部材G,G′が、第2プレートD2の荷受け面Df2の左右両側部上にそれぞれ載置されており、それらガイド部材G,G′はボルト等の結合手段26で着脱可能に固定される。   A pair of left and right guide members G and G ′ having the guide surface Gf are respectively placed on the left and right side portions of the load receiving surface Df2 of the second plate D2, and these guide members G and G ′ are coupled with bolts or the like. The means 26 is detachably fixed.

左右一方の第1ガイド部材Gにおいて、そのガイド面Gfは、第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中でストッパSがガイド面Gfに接触した時点から該重ね合わせ操作が終了するまでの間、前記接触による摩擦抵抗および前記ばね20の付勢力に抗してストッパSを格納位置SB側に回動させる回動モーメントMを該重ね合わせ操作に応じて生じさせ、且つ前記操作の終了時点ではストッパSが格納位置SBに達するような形状に形成される。   In the first guide member G on the left and right, the guide surface Gf is not overlapped when the stopper S comes into contact with the guide surface Gf during the overlap operation between the first and second plates D1 and D2. In the meantime, a rotation moment M for rotating the stopper S to the storage position SB side against the frictional resistance due to the contact and the biasing force of the spring 20 is generated according to the superposition operation, and The stopper S is formed in a shape that reaches the storage position SB at the end of the operation.

特に本実施形態において、前記ガイド面Gfは、第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中で、ストッパS先部に接触した時にその接触部(即ちガイド面GfとストッパS先部の移動軌跡Rsとの交点)での摩擦抵抗及び前記ばね20の付勢力に抗して前記回動モーメントMをストッパSに生じさせるべく略上下方向に延びる第1ガイド面Gf1と、前記回動モーメントMにより回動を開始したストッパSを前記重ね合わせ操作に連動して格納位置SBまで回動させるべく略水平方向に延びる第2ガイド面Gf2と、それら第1,第2ガイド面Gf1,Gf2間を滑らかに連続させる曲率の比較的大きいアール面rとで構成される。   In particular, in the present embodiment, the guide surface Gf is in contact with the stopper S tip during the overlap operation between the first and second plates D1 and D2 (ie, the guide surface Gf and the stopper S). A first guide surface Gf1 extending in a substantially vertical direction so as to cause the rotation moment M to be generated in the stopper S against the frictional resistance at the point of movement of the front portion movement locus Rs and the biasing force of the spring 20; A second guide surface Gf2 extending in a substantially horizontal direction to rotate the stopper S that has started to rotate by the rotation moment M to the storage position SB in conjunction with the superposition operation, and the first and second guide surfaces Gf1. , Gf2 and a rounded surface r having a relatively large curvature that smoothly continues.

而して、第1ガイド面Gf1は、第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中で、第1ガイド面Gf1に突出位置SAのストッパSの先部が接触した時に上記回動モーメントMをストッパSに作用させるべく、その接触点とストッパSの第1プレートD1に対する回動支点(即ち前記軸受ボス部24の中心)とを結ぶ仮想直線が、該接触点を通る第1ガイド面Gf1の法線に対して斜めに(即ち前記法線に対し第1プレートD1のヒンジ連結部H1とは反対側で鋭角をなして)交差するという条件、換言すれば、ストッパSの上記回動支点が前記法線を挟んで第1プレートD1のヒンジ連結部H1とは反対側に位置するという条件を少なくとも満たすような形状となっている。また、アール面r及び第2ガイド面Gf2についても、前記重ね合わせ操作が終了するまでの間、上記回動モーメントMをストッパSに作用させ続けられるような、即ち前記条件と同様の条件を少なくとも満たすような形状となっている。   Thus, the first guide surface Gf1 is in contact with the first guide surface Gf1 when the tip of the stopper S at the protruding position SA comes into contact with the first guide surface Gf1 in the middle of the overlapping operation between the first and second plates D1 and D2. In order to cause the rotation moment M to act on the stopper S, a virtual straight line connecting the contact point and the rotation fulcrum (that is, the center of the bearing boss portion 24) of the stopper S with respect to the first plate D1 passes through the contact point. The condition of intersecting obliquely with respect to the normal line of one guide surface Gf1 (that is, making an acute angle with the normal line on the side opposite to the hinge connecting part H1 of the first plate D1), in other words, the stopper S The rotation fulcrum has a shape that satisfies at least the condition that the first plate D1 is located on the opposite side of the hinge connection portion H1 across the normal. In addition, for the rounded surface r and the second guide surface Gf2, at least the same condition as the above condition, that is, the rotation moment M can continue to act on the stopper S until the superposition operation is completed. It has a shape that satisfies it.

また左右他方の第2ガイド部材G′において、そのガイド面Gfは、前記第1ガイド面Gf1及びアール面rが省略されて前記第2ガイド面Gf2のみで構成される。尚、本発明では、その第2ガイド部材G′を第1ガイド部材Gと同一の構成形態としてもよい。   In the other second guide member G ′ on the left and right sides, the guide surface Gf is constituted by only the second guide surface Gf2 with the first guide surface Gf1 and the rounded surface r omitted. In the present invention, the second guide member G ′ may have the same configuration as the first guide member G.

また複数のプレートD1〜D3の荷受け面Df1〜Df3には、滑り止め用の多数の凹凸部27が形成されており、その凹凸部27上に前記ガイド部材Gが載置、固定される。従って、そのガイド部材Gのガイド面Gfは、第2プレートD2の荷受け面Df2の凹凸部27の凸部分よりも高い位置に配置されるため、第2プレートD2の荷受け面Df2に滑り止め用の凹凸部27が特設されていても、その凹凸にストッパSの先部が引っ掛かって格納位置SB側へ回動しなくなる事態を効果的に防止できる。尚、上記滑り止め用凹凸部27は、少なくとも一部のプレートD1〜D3の荷受け面Df1〜Df3において省略してもよい。   In addition, on the load receiving surfaces Df1 to Df3 of the plurality of plates D1 to D3, many uneven portions 27 for preventing slipping are formed, and the guide member G is placed and fixed on the uneven portions 27. Therefore, since the guide surface Gf of the guide member G is disposed at a position higher than the convex portion of the concave and convex portion 27 of the load receiving surface Df2 of the second plate D2, the guide surface Gf is provided on the load receiving surface Df2 of the second plate D2 for preventing slippage. Even if the concavo-convex portion 27 is specially provided, it is possible to effectively prevent a situation in which the tip portion of the stopper S is caught by the concavo-convex portion and does not rotate to the storage position SB side. In addition, you may abbreviate | omit the said uneven | corrugated | grooved part 27 for anti-slip in the load receiving surfaces Df1-Df3 of at least some plates D1-D3.

前記第1ガイド部材Gに対応してストッパSには切欠きSkが形成されており、荷受台Dが折り畳み状態にあるときに、第1ガイド部材Gの先部(特に第1ガイド面Gf1を有する上方突出部分)が、ストッパSの切欠きSkを通して第1プレートD1の凹部21に受容される(図5参照)。このような切欠きSkの特設によれば、ガイド部材Gの先部が第2プレートD2の荷受け面Df2上に少なからず突出しても、その突出部分を、荷受台Dの折り畳み状態でストッパSを通して第1プレートD1の凹部21内に支障なく収めることができるため、折り畳み状態の荷受台Dのコンパクト化が図られる。尚、上記のような切欠きSkに代えて、ストッパSに貫通孔(図示せず)を設けて、その貫通孔を通して第1ガイド部材Gの先部が第1プレートD1の凹部21に受容されるように構成してもよい。   A notch Sk is formed in the stopper S corresponding to the first guide member G, and when the load receiving table D is in the folded state, the tip of the first guide member G (especially the first guide surface Gf1) The upward projecting portion) is received in the recess 21 of the first plate D1 through the notch Sk of the stopper S (see FIG. 5). According to such special provision of the notch Sk, even if the tip portion of the guide member G protrudes on the load receiving surface Df2 of the second plate D2, the protruding portion is passed through the stopper S in the folded state of the load receiving platform D. Since it can be accommodated in the recess 21 of the first plate D1 without hindrance, the folded load receiving platform D can be made compact. Instead of the notch Sk as described above, a through hole (not shown) is provided in the stopper S, and the tip portion of the first guide member G is received in the concave portion 21 of the first plate D1 through the through hole. You may comprise.

第1プレートD1の左右両側端部には、前記凹部21の両端開口部を体裁よく覆う左右一対のカバー板28がそれぞれ着脱可能に結合され、また第2,第3プレートD2,D3の左右両側端部にも、同様のカバー板29,30がそれぞれ着脱可能に結合される。   A pair of left and right cover plates 28 that cover both end openings of the concave portion 21 are detachably coupled to the left and right end portions of the first plate D1, respectively, and the left and right sides of the second and third plates D2 and D3. Similar cover plates 29 and 30 are also detachably coupled to the end portions.

尚、図示はしないが、荷役車両Vの適所には、従来公知の荷受台昇降装置付き荷役車両と同様に、荷受台昇降装置Aの作動を制御する制御装置が搭載されており、その制御装置には、シリンダC1,C2に対する油圧供給源と、その油圧供給源からシリンダC1,C2への作動油の給排制御を行う制御弁と、その制御弁を操作するための操作装置とが少なくとも含まれる。   Although not shown in the drawing, a control device for controlling the operation of the load receiving platform lifting device A is mounted at an appropriate place of the cargo handling vehicle V, similarly to a conventionally known cargo handling vehicle with a load receiving platform lifting device. Includes at least a hydraulic pressure supply source for the cylinders C1 and C2, a control valve that controls the supply and discharge of hydraulic fluid from the hydraulic pressure supply source to the cylinders C1 and C2, and an operating device for operating the control valve. It is.

次に前記第1実施形態の作用を説明する。先ず、図1、図9及び図10を参照して、荷受台Dが荷箱床下の格納位置(図9の(A)を参照)にある状態から、荷受け面Df1〜Df3が地面Eに連なる展開状態(図10の(E)を参照)となるまでの動作の概略を説明する。   Next, the operation of the first embodiment will be described. First, referring to FIGS. 1, 9, and 10, the load receiving surfaces Df <b> 1 to Df <b> 3 are connected to the ground E from the state in which the load receiving platform D is in the storage position below the load box floor (see FIG. 9A). An outline of the operation until the unfolded state (see FIG. 10E) is described.

図9(A)の格納状態から前後動用シリンダC1を伸長させると、折り畳み状態の荷受台Dは、それの第1プレートD1の裏面がガイドローラ8に載る位置まで車両後方へ水平移動し、図9(B)の後方張出状態となる。   When the forward / backward movement cylinder C1 is extended from the retracted state of FIG. 9A, the load receiving platform D in the folded state moves horizontally to the rear of the vehicle until the back surface of the first plate D1 rests on the guide roller 8. 9 (B) is the rear overhanging state.

次いで、この状態から昇降用シリンダC2を収縮させると、平行リンク機構PLが下方へ回動し、その回動は、図9(C)実線に示すように、第3プレートD3の下面が接地するまで続く。この間、折り畳み状態の荷受台D、特に第1,第2プレートD1,D2の重合体は、ガイドローラ8に凭れかかるようにして徐々に傾斜(即ち第3プレートD3に対し起立回動)する。尚、第3プレートD3の下面が接地した後も昇降用シリンダC2を更に若干収縮させることで、補助リンク6が若干揺動することで平行リンク機構PLが崩れて、それまで水平姿勢に保たれていた第3プレートD3が、図9(C)鎖線に示すようにやや後下がりに傾倒する。   Next, when the elevating cylinder C2 is contracted from this state, the parallel link mechanism PL is rotated downward, and this rotation is caused by the lower surface of the third plate D3 being grounded as shown by the solid line in FIG. It continues until. During this time, the folded load receiving platform D, in particular the polymer of the first and second plates D1 and D2, gradually tilts (ie, stands up and rotates with respect to the third plate D3) so as to lean on the guide roller 8. Even after the lower surface of the third plate D3 is grounded, the lifting / lowering cylinder C2 is further contracted slightly, so that the auxiliary link 6 is slightly swung so that the parallel link mechanism PL is broken, and the horizontal posture is maintained until then. The third plate D3 that has been tilted slightly rearwardly as shown by the chain line in FIG.

そして、この図9(C)の鎖線に示す状態で作業者が、傾斜姿勢にある第1,第2プレートD1,D2の重合体を第3プレートD3に対し車両後方へ回動させると、図10(D)に示すように第2プレートD2を接地させることができる。   Then, when the worker rotates the polymer of the first and second plates D1 and D2 in the inclined posture to the rear of the vehicle with respect to the third plate D3 in the state shown by the chain line in FIG. As shown in FIG. 10 (D), the second plate D2 can be grounded.

更に、この状態で、作業者が荷受台Dの第1プレートD1を第2プレートD2に対し、第1プレートD1が接地するまで車両後方へ回動させると、荷受台Dは、図10(E)に示すように地面Eに連続する展開状態となる。尚、この間、第1プレートD1は、その後方回動により第2プレートD2の荷受け面Df2から徐々に離間するので、その離間動作に連動して、格納位置SBのストッパSが、捩りコイルばね20の付勢力により突出位置SAまで自動的に回動する。   Further, in this state, when the operator rotates the first plate D1 of the load receiving table D with respect to the second plate D2 toward the rear of the vehicle until the first plate D1 comes in contact with the ground, the load receiving table D is shown in FIG. ), The unfolded state continues to the ground E. During this time, the first plate D1 is gradually separated from the load receiving surface Df2 of the second plate D2 by its rearward rotation, so that the stopper S at the storage position SB is connected to the torsion coil spring 20 in conjunction with the separation operation. It automatically rotates to the protruding position SA by the urging force.

そして、この図10(E)に示す展開状態から荷受台Dを図9(A)の格納位置まで移動させる動作は、上記と逆の手順で行えばよい。   And the operation | movement which moves the receiving stand D to the storage position of FIG. 9 (A) from the expansion | deployment state shown to this FIG.10 (E) should just be performed in the reverse procedure.

また、この図10(E)に示す展開状態のまま(即ち荷受台Dを折り畳まずに)昇降用シリンダC2を伸長させると、図1に示すように、荷受台Dは水平姿勢を保ちつつ、荷箱Nの荷台Naと略同一高さとなる上限位置まで上方回動するので、そのような昇降動作を利用して、荷台Naと地面Eとの間での荷物やキャスタ付きカートの出入れ作業を容易且つ軽快に行うことができる。そして、その作業の間、突出位置SAに付勢、保持されるストッパSは、荷受け面Df1〜Df3上に載せた図示しない荷物やキャスタ付きカートが荷受台Dから転落するのを効果的に防止することができる。   Further, when the elevating cylinder C2 is extended in the unfolded state shown in FIG. 10E (that is, without folding the load receiving table D), as shown in FIG. Since it rotates upward to an upper limit position that is substantially the same height as the loading platform Na of the cargo box N, using such ascending and descending operations, loading and unloading of luggage and carts with casters between the loading platform Na and the ground E Can be carried out easily and lightly. During the work, the stopper S that is biased and held at the protruding position SA effectively prevents a load (not shown) or a cart with casters from falling on the load receiving table D on the load receiving surfaces Df1 to Df3. can do.

ところで図10(E)に示す展開状態から、荷受台Dを折り畳む操作、特に第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中では、突出位置SAのストッパSがガイド部材Gに摺動可能に係合することで、ストッパSが捩りコイルばね20に抗して格納位置SBまで自動的に格納回動する。この作用原理を、図5〜図7を併せて参照して具体的に説明する。   By the way, from the unfolded state shown in FIG. 10 (E), the stopper S at the protruding position SA is applied to the guide member G during the operation of folding the load receiving table D, particularly during the overlapping operation between the first and second plates D1 and D2. By engaging so as to be slidable, the stopper S is automatically retracted to the retracted position SB against the torsion coil spring 20. This principle of operation will be specifically described with reference to FIGS.

即ち、荷受台Dの展開状態(図5)から第1プレートD1を第2プレートD2に対して重ね合わせる前記重ね合わせ操作の操作過程では、先ず、作業者が把手40を掴む等して第1プレートD1の先部側を持ち上げる。これにより、第1,第2プレートD1,D2間の中間ヒンジ部材10を第1プレートD1の自重により展開位置に静止させたまま、第1プレートD1だけを第1枢軸11回りに起立回動させることができる。そして、この第1プレートD1が中間ヒンジ部材10に対する回動限界に達すると、第1規制手段13により第1プレートD1が中間ヒンジ部材10と一体的に第2枢軸12回りに起立回動するようになる。   That is, in the operation process of the superposition operation in which the first plate D1 is superposed on the second plate D2 from the unfolded state of the load receiving platform D (FIG. 5), first, the operator holds the first handle 40 and so on. Lift the front side of the plate D1. Accordingly, only the first plate D1 is raised and rotated around the first pivot 11 while the intermediate hinge member 10 between the first and second plates D1 and D2 is kept stationary at the deployed position by the weight of the first plate D1. be able to. When the first plate D1 reaches the rotation limit with respect to the intermediate hinge member 10, the first restricting means 13 causes the first plate D1 to stand up and rotate around the second pivot 12 integrally with the intermediate hinge member 10. become.

そして、その回動過程の途中で、第1プレートD1が第2プレートD2の荷受け面Df2に徐々に接近し、遂には図6(A)に示すように突出位置SAのストッパSの先部が第1ガイド面Gf1に接触する。その接触の際に、第1ガイド面Gf1は、前述のようにストッパSとの接触部に働く摩擦抵抗、並びに付勢手段(捩りコイルばね20)の付勢力に抗してストッパSを格納位置SB側に回動させる回動モーメントMを生じさせるため、ストッパSの格納位置SB側への回動が開始される。   In the middle of the rotation process, the first plate D1 gradually approaches the load receiving surface Df2 of the second plate D2, and finally the tip of the stopper S at the protruding position SA is moved as shown in FIG. Contact the first guide surface Gf1. At the time of the contact, the first guide surface Gf1 retracts the stopper S against the frictional resistance acting on the contact portion with the stopper S and the urging force of the urging means (torsion coil spring 20) as described above. In order to generate a turning moment M that turns to the SB side, the stopper S starts to turn to the storage position SB side.

そして、更に第1プレートD1が第2プレートD2の荷受け面Df2に接近操作されるのに連動して、ストッパSは、図7に示す如く、その先部が第1ガイド面Gf1に沿って下方に摺接し、更にアール面rを経て第2ガイド面Gf2を摺接するようにして、格納位置SB側へ回動する。この間、ストッパSには第1ガイド面Gf1のみならずアール面r及び第2ガイド面Gf2からも上記回動モーメントMが作用し続けるため、ストッパSがそれら面r,Gf2に案内されて格納位置SB側へスムーズに回動する。そして、前記重ね合わせ操作の終了時点では、ストッパSが図6(B)に示すように格納位置SBに達している。   As the first plate D1 is further operated to approach the load receiving surface Df2 of the second plate D2, the stopper S has its tip portion lowered along the first guide surface Gf1 as shown in FIG. The second guide surface Gf2 is slidably contacted via the rounded surface r and rotated to the storage position SB side. During this time, the rotation moment M continues to act on the stopper S not only from the first guide surface Gf1 but also from the rounded surface r and the second guide surface Gf2, so that the stopper S is guided to the surfaces r and Gf2 to be stored. It smoothly rotates to the SB side. At the end of the superposition operation, the stopper S has reached the storage position SB as shown in FIG.

このように第2プレートD2の荷受け面Df2にガイド部材G(ガイド面Gf)を設けたことにより、荷受台Dの折り畳み操作、特に第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中で突出位置SAのストッパSにガイド面Gfが接触した時に、ストッパSの回動開始当初の回動方向をガイド面Gf(特に第1ガイド面Gf1)により確実に格納位置SB方向へ規定できるようになり、その後は、ガイド面Gf(特にアール面r及び第2ガイド面Gf2)のガイド作用によりストッパSを格納位置SBまで無理なくスムーズに誘導可能となる。   Thus, by providing the guide member G (guide surface Gf) on the load receiving surface Df2 of the second plate D2, the folding operation of the load receiving table D, in particular, the overlapping operation between the first and second plates D1, D2 can be performed. When the guide surface Gf comes into contact with the stopper S at the protruding position SA on the way, the initial rotation direction of the stopper S can be reliably defined in the storage position SB direction by the guide surface Gf (particularly the first guide surface Gf1). Thereafter, the stopper S can be guided smoothly and smoothly to the storage position SB by the guide action of the guide surface Gf (particularly the rounded surface r and the second guide surface Gf2).

尚、図5の仮想円R1は、突出位置SAにあるストッパSの先部を第1枢軸11回りに回動させた場合の回動軌跡であり、また仮想円R2は、同じく第2枢軸12回りに回動させた場合の回動軌跡である。そして、ガイド部材Gの第1ガイド面Gf1の配設位置は、その両方の仮想円R1,R2で挟まれた領域RX内に設定される。   The virtual circle R1 in FIG. 5 is a turning locus when the tip of the stopper S at the protruding position SA is rotated around the first pivot 11, and the virtual circle R2 is also the second pivot 12 in the same manner. It is a turning locus in the case of turning around. And the arrangement | positioning position of 1st guide surface Gf1 of the guide member G is set in the area | region RX pinched | interposed by both the virtual circles R1 and R2.

而して本実施形態によれば、荷受台先部を構成する第1プレートD1に隣接する第2プレートD2に、荷受台Dを折り畳む操作(特に第1,第2プレートD1,D2相互の前記重ね合わせ操作)の途中で、突出位置SAのストッパSに係合してストッパSを付勢手段としてのばね20に抗して格納位置SBまで誘導するガイド面Gfが設けられるため、荷受台Dの折り畳み操作(特に前記重ね合わせ操作)に機械的に連動してストッパSを、突出位置SAから格納位置SBまで自動的に格納動作させることができる。そのため、荷受台Dの折り畳み操作の途中で突出位置SAのストッパSが両プレートD1,D2間に恰も突っ張り棒のように作用して中途半端な折り畳み状態となってしまう事態の発生を未然に確実に回避できるから、その中途半端な状態のまま荷受台Dを更に折り畳み操作したり或いは車体への格納操作を行った場合にストッパSや荷受台Dが破損するのを未然に効果的に回避可能となる。   Thus, according to the present embodiment, the operation of folding the load receiving table D on the second plate D2 adjacent to the first plate D1 constituting the load receiving table tip portion (particularly, the first and second plates D1 and D2 are connected to each other). A guide surface Gf is provided in the middle of the superposition operation) to engage the stopper S at the protruding position SA and guide the stopper S to the storage position SB against the spring 20 as the biasing means. The stopper S can be automatically retracted from the protruding position SA to the storage position SB mechanically in conjunction with the folding operation (particularly the superposition operation). Therefore, in the middle of the folding operation of the load receiving platform D, the stopper S at the projecting position SA acts like a tension rod between the plates D1 and D2, and it is ensured that there will be a halfway folded state. Therefore, it is possible to effectively prevent the stopper S and the receiving platform D from being damaged when the receiving platform D is further folded or stored in the vehicle body in the halfway state. It becomes.

また特に本実施形態においては、第1ガイド部材Gに対応してストッパSには切欠きSkが形成されており、荷受台Dが折り畳み状態にあるときに、第1ガイド部材Gの先部(特に第1ガイド面Gf1を有する上方突出部分)が、ストッパSの切欠きSkを通して第1プレートD1の凹部21に受容される(図6(B)を参照)。従って、ガイド部材Gの一部が第2プレートD2の荷受け面Df2上に少なからず突出しても、その突出部分が荷受台Dの折り畳み状態でストッパSを通して第1プレートD1の凹部21内に支障なく収められて、折り畳み状態の荷受台Dのコンパクト化が図られる。   Further, particularly in the present embodiment, the notch Sk is formed in the stopper S corresponding to the first guide member G, and when the load receiving platform D is in the folded state, the front portion ( In particular, the upward projecting portion having the first guide surface Gf1) is received in the recess 21 of the first plate D1 through the notch Sk of the stopper S (see FIG. 6B). Accordingly, even if a part of the guide member G protrudes on the load receiving surface Df2 of the second plate D2, there is no hindrance in the recessed portion 21 of the first plate D1 through the stopper S when the load receiving table D is folded. The package receiving table D in the folded state can be made compact.

図11には、本発明の第2実施形態が示される。本実施形態では、第2プレートD2の荷受け面Df2上に装着されるガイド部材Gが薄肉の帯板状に形成されていて、その上面、即ちガイド面Gfが荷受け面Df2と平行な水平面とされる。そして、このガイド面Gfも、第1の実施形態と同様、第1,第2プレートD1,D2相互の前記重ね合わせ操作の途中で、ストッパSがガイド面Gfに接触した時点から前記重ね合わせ操作が終了するまでの間、前記接触による摩擦抵抗およびばね20の付勢力に抗してストッパSを格納位置SB側に回動させる回動モーメントMをストッパSに作用させるべく、その接触点とストッパSの第1プレートD1に対する回動支点(即ち前記軸受ボス部24の中心)とを結ぶ仮想直線が、該接触点を通るガイド面Gfの法線に対して斜めに(即ち前記法線に対し第1プレートD1のヒンジ連結部H1とは反対側で鋭角をなして)交差するという条件、換言すれば、ストッパSの上記回動支点が前記法線を挟んで第1プレートD1のヒンジ連結部H1とは反対側に位置するという条件を少なくとも満たすものであり、そのためにストッパSの形状や回動支点位置、ストッパSの突出位置SAでの突出高さ等が、第1実施形態とは異なっている。尚、その他の構造は、第1実施形態と同様である。   FIG. 11 shows a second embodiment of the present invention. In the present embodiment, the guide member G mounted on the load receiving surface Df2 of the second plate D2 is formed in a thin strip shape, and the upper surface, that is, the guide surface Gf is a horizontal plane parallel to the load receiving surface Df2. The And this guide surface Gf is also the said superposition operation from the time of the stopper S contacting the guide surface Gf in the middle of the said superposition operation of 1st, 2nd plate D1, D2 similarly to 1st Embodiment. In order to act on the stopper S with a turning moment M that turns the stopper S toward the retracted position SB against the frictional resistance and the biasing force of the spring 20 due to the contact, the contact point and the stopper An imaginary straight line connecting the rotation fulcrum of S with respect to the first plate D1 (that is, the center of the bearing boss portion 24) is oblique to the normal of the guide surface Gf passing through the contact point (that is, with respect to the normal). The condition that the first plate D1 intersects at an acute angle on the opposite side of the hinge connection portion H1 of the first plate D1, in other words, the rotation fulcrum of the stopper S sandwiches the normal and the hinge connection portion of the first plate D1 Therefore, the shape of the stopper S, the rotation fulcrum position, the protruding height at the protruding position SA of the stopper S, etc. are different from those of the first embodiment. ing. Other structures are the same as those in the first embodiment.

而して、本第2実施形態では、第1実施形態と基本的に同様の作用効果が期待できるが、特にガイド部材Gを薄肉扁平な板状としたため、ガイド部材Gの荷受け面Df2上からの突出高さが僅かであり、従って、ストッパSには、第1実施形態のようなガイド部材逃げ用の切欠きSk又は貫通孔を特設する必要はなく、またガイド部材G自体の構造も単純化されるため、コスト節減が図られる。   Thus, in the second embodiment, basically the same effect as that of the first embodiment can be expected. However, since the guide member G has a thin and flat plate shape, the load receiving surface Df2 of the guide member G is viewed from above. Therefore, the stopper S does not need to be provided with the notch Sk or the through hole for escaping the guide member as in the first embodiment, and the structure of the guide member G itself is simple. Cost savings.

尚、前記第2実施形態において、ガイド面Gfが荷受け面Df2と平行な水平面としたが、本発明では、そのガイド面Gfを後下がりに緩やかに傾斜した緩斜面、或いは曲率の小さい曲面としてもよく、更にはそれら緩斜面或いは円弧面と曲面とを適宜組み合わせてもよい。   In the second embodiment, the guide surface Gf is a horizontal plane parallel to the load receiving surface Df2. However, in the present invention, the guide surface Gf may be a gently sloping surface gently sloping downward or a curved surface with a small curvature. Moreover, those gentle slopes or arcuate surfaces and curved surfaces may be appropriately combined.

以上、本発明の実施の形態について説明したが、本発明はその実施の形態に限定されることなく、本発明の範囲内で種々の実施の形態が可能である。   Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various embodiments are possible within the scope of the present invention.

たとえば、前記実施の形態では、本発明に係る荷受台Dを、平行リンク機構PLを含むアーム式の昇降機構Lを備え且つそれを荷役車両Vの床下に格納できるようにした床下格納式の荷受台昇降装置Aに実施した場合を説明したが、本発明では、起立格納式(即ち折り畳まれ且つ起立した状態の荷受台を荷箱後面に沿って格納するタイプ)の荷受台昇降装置に実施してもよい。また、本発明において荷受台の昇降機構Lは、本実施形態のような平行リンク式に限定されず、例えば、折り畳み状態の荷受台を、荷役車両に固設されて上下方向に延びる昇降支柱に沿って垂直に昇降できるようにした垂直昇降式の荷受台昇降装置に実施してもよい。   For example, in the above-described embodiment, the load receiving platform D according to the present invention is provided with an arm type lifting mechanism L including a parallel link mechanism PL and stored under the floor of the cargo handling vehicle V. Although the case where the present invention is applied to the platform lifting apparatus A has been described, in the present invention, the present invention is applied to a stand receiving and lifting apparatus of a stand-up retractable type (that is, a type in which a folded and raised stand is stored along the rear surface of the load box). May be. Further, in the present invention, the lifting mechanism L of the cargo cradle is not limited to the parallel link type as in the present embodiment. For example, the folded cargo cradle is fixed to the cargo handling vehicle and extends in the vertical direction. You may implement in the vertical raising-and-lowering type receiving stand raising / lowering apparatus enabled to raise / lower vertically.

また前記実施形態では、荷受台Dを、相互にヒンジ連結した3個のプレートD1〜D3で分割構成したものを示したが、本発明の荷受台は、相互にヒンジ連結した2個のプレートで構成してもよく、或いは4個以上のプレートで構成してもよい。   In the above embodiment, the load receiving table D is divided into three plates D1 to D3 hinged to each other. However, the load receiving table of the present invention includes two plates hinged to each other. You may comprise, or may comprise 4 or more plates.

また前記実施形態では、ストッパSに対するガイド部材Gのガイド面GfをストッパSの先端部(自由端部)に係合させるようにしたものを示したが、本発明では、ストッパの先端部以外の適宜部分をガイド部材Gのガイド面Gfに係合させるようにしてもよい。   In the above-described embodiment, the guide surface Gf of the guide member G with respect to the stopper S is engaged with the distal end portion (free end portion) of the stopper S. However, in the present invention, other than the distal end portion of the stopper. An appropriate portion may be engaged with the guide surface Gf of the guide member G.

また前記実施形態では、荷受台Dの構成プレートD1〜D3相互をヒンジ連結H1,H2するに当たり、プレート持ち上げ高さを極力低くして作業負担を軽減するために、相隣なるプレートD1,D2;D2,D3間に、一対の枢軸を有する中間ヒンジ部材10,13を各々介在させるものを示したが、本発明では、そのような中間ヒンジ部材を介在させずに相隣なるプレート相互間を単一の枢軸で直接ヒンジ連結するようにしてもよい。   Moreover, in the said embodiment, in order to reduce plate | board lifting height as much as possible and reducing work burden, when the plate | boards D1-D3 of the load receiving stand D are hinged connection H1, H2, the adjacent plates D1, D2; Although the intermediate hinge members 10 and 13 having a pair of pivots are respectively interposed between D2 and D3, in the present invention, the adjacent plates are not separated from each other without the intermediate hinge members. A direct hinge connection may be made at one pivot.

また前記実施形態では、ストッパSを自由状態(荷受台Dの展開状態)では常時突出位置に付勢保持するものを示したが、本発明では、ストッパが荷受台の折り畳み操作に連動して格納位置まで移動したときに、これに連動してストッパを格納位置に自動的にロックし得るロック機構を併設してもよい。尚、そのロック機構の構造は、例えば特開2009−101761号公報に例示したロック機構と同様であってもよい。   In the above-described embodiment, the stopper S is always urged and held at the protruding position in the free state (the unfolded state of the load receiving table D). However, in the present invention, the stopper is stored in conjunction with the folding operation of the load receiving table. A lock mechanism that can automatically lock the stopper in the retracted position in conjunction with this when moved to the position may be provided. Note that the structure of the lock mechanism may be the same as the lock mechanism exemplified in Japanese Patent Application Laid-Open No. 2009-101761, for example.

また前記実施形態では、荷受台Dの折り畳み操作の一部を作業者が手動で行うようにしたものを示したが、本発明では、荷受台の折り畳み操作の一部又は全部をプレート相互間に設けたアクチュエータで強制的に行うようにしてもよい。   In the above embodiment, the operator manually performs a part of the folding operation of the loading platform D. However, in the present invention, a part or all of the folding operation of the loading platform is performed between the plates. You may make it carry out forcibly with the provided actuator.

また前記実施形態では、荷受台昇降装置Aを、荷箱付き荷役車両の車体枠Fに設けて、その車両の荷箱の荷台Naと地面間で荷受台Dを昇降作動させるようにしたものを示したが、本発明では、車体枠以外の車両固定物や荷箱に荷受台昇降装置を設けてもよく、更に荷箱を持たない車両や、車両以外の荷物移送装置に荷受台昇降装置を設けてもよい。   Moreover, in the said embodiment, the load receiving table raising / lowering apparatus A is provided in the vehicle body frame F of the cargo handling vehicle with a load box, and the load receiving stand D is moved up and down between the load bed Na of the load box of the vehicle and the ground. Although shown in the present invention, a cargo receiving platform lifting device may be provided on a fixed vehicle or a cargo box other than the vehicle body frame, and the cargo receiving platform lifting device may be provided on a vehicle that does not have a cargo box, or a cargo transfer device other than the vehicle. It may be provided.

A・・・・・荷受台昇降装置
D・・・・・荷受台
D1〜D3・・・・第1〜第3プレート
Df1〜Df3・・第1〜第3プレートの荷受面
E・・・・・地面
F・・・・・車体枠(支持体)
G・・・・・ガイド部材
Gf・・・・ガイド面
H1,H2・・ヒンジ連結部(ヒンジ連結)
L・・・・・昇降機構
M・・・・・回動モーメント
Na・・・・荷台
S・・・・・ストッパ
SA・・・・ストッパの突出位置
SB・・・・ストッパの格納位置
Sk・・・・切欠き
20・・・・付勢手段としての捩りコイルばね
21・・・・第1プレートの凹部
27・・・・滑り止め用の凹凸部
A: Loading platform lifting device D: Loading platform D1-D3, ... First to third plates Df1-Df3, ... Loading surface E of first to third plates・ Ground F ... Body frame (support)
G ... Guide member Gf ... Guide surfaces H1, H2 ... Hinge connection (hinge connection)
L ... Lifting mechanism M ... Turning moment Na ... Loading platform S ... Stopper SA ... Stopper projection position SB ... Stopper storage position Sk ... ... Notch 20 ... Torsion coil spring 21 as urging means ...... Concavity 27 of first plate ...... Uneven portion for preventing slip

Claims (4)

支持体(F)に昇降機構(L)を介して取付けた荷受台(D)が、該昇降機構(L)に駆動されて地面(E)と荷台(N)間を昇降作動可能である荷受台昇降装置であって、
前記荷受台(D)が、上面を荷受け面(Df1〜Df3)とした複数のプレート(D1〜D3)より分割構成され、その複数のプレート(D1〜D3)は、それらが略水平に一列に並んだ展開状態と、上下に重なり合う折り畳み状態とをとり得るように相互にヒンジ連結(H1,H2)され、前記複数のプレート(D1〜D3)のうち荷受台(D)先部を構成する第1プレート(D1)には、その第1プレート(D1)の荷受け面(Df1)に対し略面一となる格納位置(SB)と同荷受け面(Df1)より突出した突出位置(SA)との間で回動可能なストッパ(S)が軸支されると共に、そのストッパ(S)を前記突出位置(SA)に付勢する付勢手段(20)が該ストッパ(S)と第1プレート(D1)間に設けられるものにおいて、
前記第1プレート(D1)に隣接する第2プレート(D2)には、前記荷受台(D)を折り畳むために該第2プレート(D2)の荷受け面(Df2)上に第1プレート(D1)を重ね合わせる操作の途中で、前記突出位置(SA)の前記ストッパ(S)に係合して該ストッパ(S)を前記付勢手段(20)に抗して前記格納位置(SB)まで誘導するガイド面(Gf)が設けられることを特徴とする、荷受台昇降装置。
A load receiving platform (D) attached to the support body (F) via an elevating mechanism (L) is driven by the elevating mechanism (L) and can be moved up and down between the ground (E) and the loading platform (N). A table lifting device,
The cargo receiving platform (D) is divided and configured from a plurality of plates (D1 to D3) whose upper surfaces are the receiving surfaces (Df1 to Df3), and the plurality of plates (D1 to D3) are arranged substantially in a row. A plurality of plates (D1 to D3) are hinge-connected (H1, H2) so that they can be arranged side by side and folded up and down so as to form a load receiving platform (D) front portion of the plurality of plates (D1 to D3). One plate (D1) has a storage position (SB) that is substantially flush with the load receiving surface (Df1) of the first plate (D1) and a protruding position (SA) that protrudes from the load receiving surface (Df1). A stopper (S) that can pivot between the stopper (S) and the first plate (S) is provided with a biasing means (20) that biases the stopper (S) to the protruding position (SA). D1) provided between,
The second plate (D2) adjacent to the first plate (D1) includes a first plate (D1) on a load receiving surface (Df2) of the second plate (D2) for folding the load receiving table (D). In the middle of the operation of overlaying, the stopper (S) is engaged with the protruding position (SA) and the stopper (S) is guided to the retracted position (SB) against the biasing means (20). A cargo receiving platform lifting device, characterized in that a guide surface (Gf) is provided.
前記ガイド面(Gf)は、前記操作の途中で前記ストッパ(S)が該ガイド面(Gf)に接触した時点から前記操作が終了するまでの間、前記接触による摩擦抵抗および前記付勢手段(20)の付勢力に抗して前記ストッパ(S)を前記格納位置(SB)側に回動させる回動モーメント(M)を生じさせる形状に形成されることを特徴とする、請求項1に記載の荷受台昇降装置。   The guide surface (Gf) has a frictional resistance due to the contact and the urging means (from the time when the stopper (S) contacts the guide surface (Gf) during the operation to the end of the operation. 20. A shape according to claim 1, wherein a rotation moment (M) for rotating the stopper (S) to the storage position (SB) side against the urging force of 20) is formed. The cargo receiving platform lifting device described. 前記複数のプレート(D1〜D3)のうち少なくとも第2プレート(D2)の荷受け面(Df2)には滑り止め用の凹凸部(27)が形成され、前記ガイド面(Gf)を有するガイド部材(G)が、前記凹凸部(27)の凸部分よりも高い位置に前記ガイド面(Gf)を位置させるようにして前記第2プレート(D2)の荷受け面(Df2)上に装着されることを特徴とする、請求項1又は2に記載の荷受台昇降装置。   Of the plurality of plates (D1 to D3), at least a load receiving surface (Df2) of the second plate (D2) is provided with a non-slip uneven portion (27) and has a guide member (Gf). G) is mounted on the load receiving surface (Df2) of the second plate (D2) so that the guide surface (Gf) is positioned higher than the convex portion of the uneven portion (27). The load receiving table elevating device according to claim 1, wherein the device is a lifting device. 前記第1プレート(D1)の荷受け面(Df1)には、前記格納位置(SB)の前記ストッパ(S)を受容する凹部(21)が形成され、前記ガイド面(Gf)を有するガイド部材(G)が前記第2プレート(D2)の荷受け面(Df2)上に突設され、前記ガイド部材(G)の先部は、前記荷受台(D)が折り畳み状態にあるときに、前記ストッパ(S)に設けた切欠き(Sk)又は貫通孔を通して前記凹部(21)に受容されることを特徴とする、請求項1〜3の何れか1項に記載の荷受台昇降装置。   On the load receiving surface (Df1) of the first plate (D1), a recess (21) for receiving the stopper (S) at the storage position (SB) is formed, and a guide member (Gf) having the guide surface (Gf) G) is projected on the load receiving surface (Df2) of the second plate (D2), and the front portion of the guide member (G) has the stopper (D) when the load receiving platform (D) is in a folded state. The load receiving platform lifting device according to any one of claims 1 to 3, wherein the load receiving platform lifting device is received in the recess (21) through a notch (Sk) or a through hole provided in S).
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