JP2001171988A - Boarding and unboarding device of working bench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boarding and unboarding device which needs no step other than a working bench, in the boarding and the unboarding in an inclining place and the like, and does not disturb the working. SOLUTION: This boarding and unboarding device is used to a working vehicle which installs the working bench 3 at the front end of a boom 2. To the working bench 3, a step member 10 is installed displaceable so as to take the step member 10 both the attitude hung down from the bottom face of the working bench 3, and the attitude returned to the working bench 3. A spring 9 to return the step member 10 from the hanging down condition to the working bench 3 side is provided.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ブーム先端に作業
台を取付けた作業車両において、作業者が作業台に乗降
するための乗降装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boarding / alighting device for a worker to get on and off a work table in a work vehicle having a work table attached to the end of a boom.

【０００２】[0002]

【従来の技術】高所作業車のようにブーム先端に作業台
を取付けた作業車両においては、その操作装置は作業台
に設けられており、作業者は作業車両を格納姿勢、すな
わち伸縮ブームを最縮にし、ブームを倒伏させた一番低
い姿勢にした状態で作業台への乗降を行う。乗降は、作
業者が作業台に足を掛け、作業台の前面または側面の乗
降口から乗降口を閉塞しているバー等の部材を開いて行
う。このため、通常の格納姿勢では作業台がそれほど高
くならないように設定されており、乗降動作が困難とな
らないようになっている。2. Description of the Related Art In a work vehicle having a work table attached to the end of a boom, such as an aerial work vehicle, an operating device is provided on the work table, and a worker places the work vehicle in a retracted posture, that is, a telescopic boom. Get into and out of the workbench with the boom in the lowest position with the boom down. The getting on and off is performed by an operator placing his / her feet on the work table and opening a member such as a bar closing the door from the door on the front or side of the work table. For this reason, the working table is set not to be so high in the normal storage posture, so that the getting on / off operation is not difficult.

【０００３】[0003]

【発明が解決しようとする課題】ところが、前記作業車
両の格納姿勢において、地面に傾斜があったり不整地で
ある場合、作業台が地面から高い位置となる場合があ
り、そのままでは乗降が困難であり、踏み台等の乗降装
置が必要となるので、踏み台を用意しておく必要があり
扱いが煩わしいという問題点がある。このため、作業台
に固定の踏み台を設けたものもあるが、固定の踏み台を
設けた場合には、作業の妨げになるという問題点があ
る。また、踏み台を上げ下げ位置調整自在に設け、作業
者が作業台に乗る時には踏み台を下げ、作業中には踏み
台を上げることも考えられるが、作業者が作業台に乗っ
た後に踏み台を上げることを忘れると、踏み台が作業の
邪魔になったり、作業中に踏み台が障害物に衝突して破
損するおそれがあるという問題点がある。However, when the work vehicle is in the retracted position, if the ground is sloping or uneven, the workbench may be at a higher position from the ground, and it is difficult to get on and off the work table as it is. In addition, there is a problem that a stepping platform or the like is required, so that it is necessary to prepare a stepping platform and the handling is troublesome. For this reason, some work platforms are provided with a fixed step, but when the fixed step is provided, there is a problem that the work is hindered. It is also conceivable to raise and lower the step platform when the worker gets on the platform and raise the platform during work.However, it is necessary to raise the platform after the worker gets on the platform. If the user forgets, there is a problem that the step may interfere with the work or the step may collide with an obstacle during the work and may be damaged.

【０００４】本発明は、上述のような問題点に鑑み、傾
斜地等における乗降の際に作業台とは別体の踏み台を必
要とせず、かつ作業の邪魔にならない作業台用乗降装置
を提供することを目的とする。The present invention has been made in view of the above-described problems, and provides a workbench getting-on / off device that does not require a stepping stand separate from a worktable when getting on and off on a slope or the like and does not hinder work. The purpose is to:

【０００５】[0005]

【課題を解決するための手段】請求項１の作業台用乗降
装置は、ブームの先端に作業台を取付けた作業車両にお
ける作業台用乗降装置であって、前記作業台に、ステッ
プ部材を、該ステップ部材が作業台の底面から下方に垂
下された姿勢と、作業台に戻した姿勢とがとれるように
変位可能に取付けると共に、前記ステップ部材を垂下状
態から作業台側に戻すばねを設けたことを特徴とする。According to a first aspect of the present invention, there is provided a workbench elevating device for a work vehicle having a workbench attached to a tip end of a boom, wherein a step member is provided on the workbench. The step member is mounted so as to be displaceable so that a posture in which the step member is suspended downward from the bottom surface of the work table and a posture in which the step member is returned to the work table, and a spring for returning the step member from the suspended state to the work table side is provided. It is characterized by the following.

【０００６】このように、作業台にステップ部材を垂下
姿勢と作業台に戻した姿勢とが取れるように設けたの
で、作業台と別の踏み台を必要とすることなく、傾斜地
等において作業台が地面から高くなるような乗降時にお
いても、作業者を煩わすことなく、乗降することが可能
である。また、ステップ部材を垂下姿勢から作業台側に
上げて復帰させるばねを設けたことにより、ステップ部
材の使用後は作業者が元に戻す操作を行うことないので
手間がかからず、また、ステップ部材が自動的に上がる
ので、ステップ部材の戻し忘れによってステップ部材が
作業の邪魔になるおそれがない。As described above, the work table is provided so that the step member can be set in the hanging posture and the posture in which the step member is returned to the work table. Even at the time of getting on and off such that it is higher than the ground, it is possible to get on and off without bothering the operator. Also, by providing a spring that raises and returns the step member from the hanging posture to the workbench side, after the step member is used, the operator does not need to perform an operation of returning to the original position, so that it is not troublesome, and Since the member is automatically raised, there is no possibility that the step member will obstruct the work due to forgetting to return the step member.

【０００７】請求項２の作業台用乗降装置は、請求項１
において、前記ステップ部材を含む上げ下げ枠を、作業
台の前面または側面の乗降口に設け、前記上げ下げ枠を
上げた状態においては、前記上げ下げ枠が前記乗降口を
塞ぐように構成したことを特徴とする。According to a second aspect of the present invention, there is provided a workbench elevating device.
In the above, the lifting frame including the step member, provided at the entrance or exit of the front or side of the work table, in a state where the lifting frame is raised, the lifting frame is configured to close the entrance. I do.

【０００８】このように、乗降口を開閉するように上げ
下げ枠を設けることにより、上げ下げ枠を乗降口閉塞部
材に共用させることができる。Thus, by providing the raising and lowering frame so as to open and close the entrance, the raising and lowering frame can be shared by the entrance and exit closing member.

【０００９】請求項３の作業台用乗降装置は、請求項１
または２において、前記ステップ部材が作業台から垂下
された状態においてステップ部材を支持するストッパを
設けたことを特徴とする。A third aspect of the present invention is a workbench getting-on / off device.
Or wherein the stopper is provided for supporting the step member when the step member is suspended from the worktable.

【００１０】このようにストッパを設けることにより、
ステップ部材が確り支持され、ステップ部材が安定する
と共に、ばねに無理が力がかかることはない。By providing the stopper as described above,
The step member is securely supported, the step member is stabilized, and no excessive force is applied to the spring.

【００１１】[0011]

【発明の実施の形態】図１（Ａ）は本発明による乗降装
置の一実施の形態を備えた作業車両を示す側面図、図１
（Ｂ）はその作業台を示す斜視図、図２（Ａ）、（Ｂ）
はその作用を説明する正面図である。図１（Ａ）におい
て、１は高所作業車として構成される作業車両の本体で
あり、１ａは走行体、１ｂは旋回装置、１ｃは旋回体で
ある。２は旋回体１ｃに起伏自在に取付けられた伸縮ブ
ーム、３はその先端に水平保持機構（図示せず）により
上下回動自在に取付けられた作業台であり、該作業台３
はブーム２の先端に水平旋回可能に取付けられる場合も
ある。４は作業台３上に設置された操作装置である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a side view showing a working vehicle provided with an embodiment of a getting on / off device according to the present invention.
(B) is a perspective view showing the work table, FIGS. 2 (A) and (B).
FIG. 4 is a front view illustrating the operation. In FIG. 1A, reference numeral 1 denotes a main body of a work vehicle configured as an aerial work vehicle, 1a denotes a traveling body, 1b denotes a turning device, and 1c denotes a turning body. Reference numeral 2 denotes a telescopic boom which is attached to the revolving unit 1c so as to be able to move up and down. Reference numeral 3 denotes a work table which is attached to a tip end of the revolving boom by a horizontal holding mechanism (not shown).
May be attached to the tip of the boom 2 so as to be able to turn horizontally. Reference numeral 4 denotes an operation device installed on the work table 3.

【００１２】５は作業台３に取付けられた本発明による
乗降装置である。該乗降装置５は、作業台３の前部の左
右に固定された軸６と、各軸６に嵌合されたブラケット
７と、該各ブラケット７と縦ロッド８との間に介装され
た引張ばね９と、左右の縦ロッド８、８に両端を固定し
て設けたステップ部材１０と、作業台３の前部の左右の
下部に固定され、前記縦ロッド８を上下動自在に貫挿し
た孔を有するストッパ１１とからなる。１２は作業台３
の前面の乗降口を閉塞するバーからなる閉塞部材であ
る。該閉塞部材１２は、作業台３の前面の２本の縦枠１
３、１３の一方に軸１４を中心として回動自在に取付け
られ、水平の閉塞姿勢において自由端が他方の縦枠１３
に設けた受け具１６に係止される。Reference numeral 5 denotes a getting-on / off device according to the present invention mounted on the work table 3. The elevating device 5 is provided with shafts 6 fixed to the left and right of the front of the worktable 3, brackets 7 fitted to the shafts 6, and interposed between the brackets 7 and the vertical rods 8. A tension spring 9, a step member 10 provided with both ends fixed to the left and right vertical rods 8, 8, and a step member 10 fixed to the lower left and right front portions of the worktable 3, and the vertical rod 8 is vertically movably inserted. And a stopper 11 having a hole. 12 is a workbench 3
It is a closing member consisting of a bar for closing the entrance at the front of the vehicle. The closing member 12 includes two vertical frames 1 on the front surface of the worktable 3.
3 and 13 is attached to one of the vertical frames 13 so as to be rotatable about a shaft 14 and has a free end in the horizontal closed position.
Is locked by the receiving member 16 provided in the first position.

【００１３】この乗降装置５は、通常時には図２（Ａ）
に示すように、引張ばね９の力によりステップ部材１０
が作業台３側に引き上げられている。図１（Ａ）に示す
ように、地面１７が傾斜していたり、不整地である等の
理由により、作業台３の位置が高い場合、作業者１８は
前記閉塞部材１２を上げ、ステップ部材１０を引き下げ
て足を載せて作業台３内に入る。ステップ部材１０を引
き下げて作業者１８がステップ部材１０に乗った状態で
は、図２（Ｂ）に示すように、縦ロッド８の上端の鍔部
８ａがストッパ１１に係止されてより以上の縦ロッド８
の降下が阻まれる。これにより引張ばね９の伸びきりに
よる破損が防止されると共に、ステップ部材１０の上下
動がなくなり、安定する。This getting on / off device 5 normally operates as shown in FIG.
As shown in FIG.
Are raised to the work table 3 side. As shown in FIG. 1 (A), when the work table 3 is at a high position due to the ground 17 being inclined or uneven terrain, the worker 18 raises the closing member 12 and raises the step member 10. Is lowered and the foot is put on the work table 3. In a state where the step member 10 is pulled down and the worker 18 rides on the step member 10, as shown in FIG. 2B, the flange 8 a at the upper end of the vertical rod 8 is locked by the stopper 11 and Rod 8
Is prevented from descending. This prevents breakage due to the extension of the tension spring 9 and prevents the step member 10 from moving up and down, thereby stabilizing it.

【００１４】作業者１８が作業台３上に乗り、ステップ
部材１０に作業者１８の荷重がかからなくなると、引張
ばね９の力によりステップ部材１０が自動的に引き上げ
られ、作業台３側に戻される。これにより、乗降装置５
が高所作業の邪魔にならない状態となる。When the worker 18 rides on the worktable 3 and the load of the worker 18 is not applied to the step member 10, the step member 10 is automatically pulled up by the force of the tension spring 9, and is moved to the worktable 3 side. Will be returned. Thereby, the getting on and off device 5
Is not in the way of working at height.

【００１５】図２（Ｃ）は本発明による乗降装置の他の
実施の形態を示す正面図である。本実施の形態は、圧縮
ばね２０を内蔵するばねシリンダ２１を前記ブラケット
７に連結し、ばねシリンダ２１のロッド２２の下端をス
テップ部材１０に固定したものである。FIG. 2C is a front view showing another embodiment of the getting on / off device according to the present invention. In this embodiment, a spring cylinder 21 having a built-in compression spring 20 is connected to the bracket 7, and the lower end of a rod 22 of the spring cylinder 21 is fixed to the step member 10.

【００１６】図２（Ｃ）の実施の形態においては、ステ
ップ部材１０に作業者の荷重をかけることにより、ステ
ップ部材１０が二点鎖線で示すように下降し、圧縮ばね
２０が圧縮され、作業者の乗降が容易となる。この実施
の形態においては、シリンダ２１自体にストッパ機能が
あるため、特にストッパを別に設ける必要がない。In the embodiment shown in FIG. 2C, when a load of an operator is applied to the step member 10, the step member 10 descends as shown by a two-dot chain line, and the compression spring 20 is compressed. It is easy for people to get on and off. In this embodiment, since the cylinder 21 itself has a stopper function, it is not particularly necessary to separately provide a stopper.

【００１７】図３（Ａ）は本発明の乗降装置の他の実施
の形態を示す正面図、図３（Ｂ）はその側面図、図３
（Ｃ）はその使用状態を示す正面図である。該実施の形
態は、作業台３の正面の縦枠１３、１３間の乗降口２３
に上げ下げ枠２４を設けたものである。すなわち、縦枠
１３、１３の下部にそれぞれガイドを兼ねたストッパ２
５、２５を設け、これらのストッパ２５、２５にそれぞ
れ摺動自在に縦ロッド２６、２６を嵌合し、これらの縦
ロッド２６、２６の下端に両端を固定してステップ部材
２７を設け、縦ロッド２６、２６の上端に両端を連結し
て閉塞部材２９を設けて四角形の上げ下げ枠２４を構成
する。３１は上げ下げ枠２４と縦枠１３の上部に固定し
た軸３２との間に介装した引張ばねである。３４は作業
台３の横枠３５（または縦枠１３）に固定して取付けた
離脱防止用の下面開口構造を有する係止部材であり、上
げ下げ枠２４を引き上げた状態において、閉塞部材２９
を嵌合するものである。FIG. 3A is a front view showing another embodiment of the getting on / off device of the present invention, FIG. 3B is a side view thereof, and FIG.
(C) is a front view showing the state of use. In this embodiment, the entrance 23 between the vertical frames 13 and 13 on the front of the worktable 3 is provided.
Is provided with a raising / lowering frame 24. That is, the stoppers 2 serving also as guides are provided below the vertical frames 13 and 13, respectively.
Vertical rods 26 and 26 are slidably fitted to the stoppers 25 and 25, respectively, and both ends are fixed to lower ends of the vertical rods 26 and 26, and a step member 27 is provided. A closing member 29 is provided by connecting both ends to the upper ends of the rods 26, 26 to form a rectangular raising / lowering frame 24. Reference numeral 31 denotes a tension spring interposed between the raising / lowering frame 24 and a shaft 32 fixed on the upper part of the vertical frame 13. Reference numeral 34 denotes a locking member having a lower surface opening structure for preventing detachment fixed to and attached to the horizontal frame 35 (or the vertical frame 13) of the work table 3, and the closing member 29 when the lifting frame 24 is raised.
Is fitted.

【００１８】この乗降装置においては、作業台３に作業
者が乗る場合には、図３（Ａ）、（Ｂ）のように引張ば
ね３１により上げ下げ枠２４が引き上げられた状態から
図３（Ｃ）に示すように上げ下げ枠２４を引き下げて乗
降口２３を開き、ステップ部材２７に足を載せて乗降口
２３から作業台３内に入る。この時、閉塞部材２９はス
トッパ２５に当接して上げ下げ枠２４が安定して支持さ
れる。作業者が作業台３内に入ることによってステップ
部材２７から作業者が足を離すと引張ばね３１の力によ
り上げ下げ枠２４が自動的に引き上げられ、閉塞部材２
９が乗降口２３を塞ぐ。同時に閉塞部材２９は係止部材
３４に嵌まり、作業台３内から外方への力が作用して
も、上げ下げ枠２４が外に倒れることが防止される。In this getting-on / off device, when the worker gets on the work table 3, the lifting / lowering frame 24 is lifted up by the tension spring 31 as shown in FIGS. As shown in ()), the elevator frame 24 is pulled down to open the entrance 23, and the foot is placed on the step member 27 to enter the work table 3 from the entrance 23. At this time, the closing member 29 comes into contact with the stopper 25 to stably support the raising / lowering frame 24. When the worker separates his / her foot from the step member 27 by entering the work table 3, the lifting / lowering frame 24 is automatically raised by the force of the tension spring 31, and the closing member 2 is closed.
9 blocks the entrance 23. At the same time, the closing member 29 is fitted into the locking member 34, and even if a force is applied outward from inside the worktable 3, the lifting frame 24 is prevented from falling out.

【００１９】このように、上げ下げ枠２４の少なくとも
一部が乗降口２３を開閉するように構成することによ
り、上げ下げ枠２４を乗降口閉塞部材として共用させる
ことができ、部品点数の低減が図れる。As described above, at least a part of the lifting frame 24 opens and closes the entrance 23, so that the lifting frame 24 can be commonly used as a door closing member, and the number of parts can be reduced.

【００２０】図４（Ａ）は本発明による乗降装置の他の
実施の形態を示す正面図、図４（Ｂ）はその側面図であ
る。図４の実施の形態は、ステップ部材３６を含む上げ
下げ枠３７を直線的な上下動ではなく、回動によって上
げ下げするように構成したものである。このような回動
機構を構成するため、作業台３の正面のパイプでなる下
枠３８にパイプ等の枢着部材３９を回動自在に嵌合し、
該枢着部材３９とステップ部材３６とを縦ロッド４０に
より結合して上げ下げ枠３７を構成する。また、下枠３
８とこれに嵌合する枢着部材３９との間には、図４
（Ｂ）の矢印４３で示すように上げ下げ枠３７を上げる
方向に付勢するコイルばね４４を取付ける。作業台３の
縦枠１３（または横枠３５）にはステップ部材３６を上
げた状態においてステップ部材３６を係止してその倒れ
を防止する係止部材４５を設ける。４６はステップ部材
３６を下げた時に床板４７等の受け部材に当接させてス
テップ部材３６の振れを防止するストッパである。FIG. 4A is a front view showing another embodiment of the getting-on / off device according to the present invention, and FIG. 4B is a side view thereof. In the embodiment shown in FIG. 4, the raising and lowering frame 37 including the step member 36 is configured to be raised and lowered not by linear up and down movement but by rotation. In order to constitute such a rotating mechanism, a pivoting member 39 such as a pipe is rotatably fitted to a lower frame 38 made of a pipe in front of the worktable 3,
The pivot member 39 and the step member 36 are connected to each other by the vertical rod 40 to form the lifting frame 37. In addition, lower frame 3
8 and the pivot member 39 which fits the same.
As shown by an arrow 43 in (B), a coil spring 44 that urges the raising / lowering frame 37 in the upward direction is attached. The vertical frame 13 (or the horizontal frame 35) of the work table 3 is provided with a locking member 45 for locking the step member 36 in a state where the step member 36 is raised and preventing the step member 36 from falling down. Reference numeral 46 denotes a stopper which is brought into contact with a receiving member such as a floor plate 47 when the step member 36 is lowered to prevent the step member 36 from swinging.

【００２１】この実施の形態においては、作業者が作業
台３上に乗る場合、係止部材４５によるステップ部材３
６の係止を解き、上げ下げ枠３７を図５（Ｂ）の矢印４
９で示すように回動させてステップ部材３６を下げる。
これにより、作業台３の縦枠１３、１３間の乗降口２３
が開く。その後ステップ部材３６に足を載せて作業台３
上に作業者が乗り、作業者がステップ部材３６から足を
離すと、コイルばね４４の力により上げ下げ枠３７が自
動的に上がる。作業台３上の作業者は係止部材４５をス
テップ部材３６に掛けることにより、内方から作業者が
ステップ部材３６にもたれても、ステップ部材３６が外
れることが防止される。In this embodiment, when the operator gets on the work table 3, the step member 3 by the locking member 45 is used.
6 and the raising / lowering frame 37 is moved to the position indicated by the arrow 4 in FIG.
The step member 36 is lowered by being rotated as shown by 9.
Thereby, the entrance 23 between the vertical frames 13 and 13 of the work table 3
Opens. Thereafter, the foot is placed on the step member 36 and the work table 3
When an operator rides on the top and the operator releases his / her foot from the step member 36, the raising and lowering frame 37 is automatically raised by the force of the coil spring 44. The worker on the work table 3 hooks the locking member 45 on the step member 36, thereby preventing the step member 36 from coming off even if the worker leans on the step member 36 from inside.

【００２２】なお、図３、図４の実施の形態において、
縦枠１３、１３間に図１（Ｂ）に示した閉塞部材１２を
設けることにより、前記係止部材２９、４５を無くした
構造も採用可能である。また、ばねによる急激な上げ動
作を緩和するため、ダンパやショックアブソーバー等を
設けてもよい。また、係止部材３４、４５の代わりに、
上げ下げ枠２４、３７の上げ動作により自動的にロック
する機構を設けてもよい。さらに、作業台３への乗降口
は作業台３の側面に設けてもよく、作業台３を側面に設
ける場合は、ステップ部材も作業台３の側面側に設ける
ことになる。In the embodiment shown in FIGS. 3 and 4,
By providing the closing member 12 shown in FIG. 1B between the vertical frames 13, 13, a structure in which the locking members 29, 45 are eliminated can be adopted. Further, a damper, a shock absorber, and the like may be provided to alleviate the sudden raising operation by the spring. Also, instead of the locking members 34 and 45,
A mechanism for automatically locking by raising and lowering frames 24 and 37 may be provided. Further, the entrance to the work table 3 may be provided on the side surface of the work table 3. When the work table 3 is provided on the side surface, the step member is also provided on the side surface of the work table 3.

【００２３】[0023]

【発明の効果】請求項１によれば、作業台にステップ部
材を垂下姿勢と作業台に戻した姿勢とが取れるように上
げ下げ可能に設けたので、作業台と別の踏み台を必要と
することなく、傾斜地等において作業台が地面から高く
なるような乗降時においても、作業者を煩わすことな
く、乗降することが可能である。また、ステップ部材を
垂下姿勢から作業台側に上げて復帰させるばねを設けた
ことにより、ステップ部材の使用後は作業者が元に戻す
操作を行うことないので手間がかからず、また、ステッ
プ部材が自動的に上がるので、ステップ部材の戻し忘れ
によってステップ部材が作業の邪魔になるおそれがな
い。また、ステップ部材が作業台側に自動的に復帰する
ので、作業中にステップ部材が障害物に衝突して破損す
るおそれがない。According to the first aspect of the present invention, the workbench is provided so that it can be raised and lowered so that the step member can be set in the hanging posture and the posture returned to the workbench. In addition, even at the time of getting on and off such that the work table rises above the ground on an inclined ground or the like, it is possible to get on and off without bothering the operator. Also, by providing a spring that raises and returns the step member from the hanging posture to the workbench side, after the step member is used, the operator does not need to perform an operation of returning to the original position, so that it is not troublesome, and Since the member is automatically raised, there is no possibility that the step member will obstruct the work due to forgetting to return the step member. Further, since the step member automatically returns to the workbench side, there is no possibility that the step member collides with an obstacle during work and is damaged.

【００２４】請求項２によれば、請求項１において、乗
降口を開閉するようにステップ部材を有する上げ下げ枠
を設けたので、上げ下げ枠を乗降口の閉塞部材に共用さ
せることができ、部品点数の低減が図れる。According to the second aspect, in the first aspect, the raising and lowering frame having the step member is provided so as to open and close the entrance, so that the raising and lowering frame can be shared with the closing member of the entrance and exit, and the number of parts can be reduced. Can be reduced.

【００２５】請求項３によれば、請求項１または２にお
いて、ステップ部材が作業台から垂下された状態におい
てステップ部材を支持するストッパを設けたので、ステ
ップ部材が確り支持され、ステップ部材が安定すると共
に、ばねに無理が力がかかることが防止される。According to the third aspect, in the first or second aspect, since the stopper for supporting the step member is provided when the step member is suspended from the worktable, the step member is securely supported, and the step member is stabilized. At the same time, it is possible to prevent a force from being applied to the spring.

【図面の簡単な説明】[Brief description of the drawings]

【図１】（Ａ）は本発明による乗降装置の一実施の形態
を備えた作業車両を示す側面図、（Ｂ）はその作業台を
示す斜視図である。FIG. 1A is a side view showing a work vehicle provided with an embodiment of a getting on and off device according to the present invention, and FIG. 1B is a perspective view showing a work table thereof.

【図２】（Ａ）、（Ｂ）は図１の乗降装置の作用をそれ
ぞれステップ部材の上げ状態、下げ状態で示す正面図、
（Ｃ）は本発明の乗降装置の他の実施の形態を示す正面
図である。2 (A) and 2 (B) are front views showing the operation of the getting-on / off device of FIG. 1 in a raised state and a lowered state of a step member, respectively.
(C) is a front view showing another embodiment of the getting on and off device of the present invention.

【図３】（Ａ）は本発明の乗降装置の他の実施の形態を
示す正面図、（Ｂ）はその側面断面図、（Ｃ）はそのス
テップ部材を下げた状態を示す正面図である。3 (A) is a front view showing another embodiment of the getting-on / off device of the present invention, FIG. 3 (B) is a side sectional view thereof, and FIG. 3 (C) is a front view showing a state where the step member is lowered. .

【図４】（Ａ）は本発明の乗降装置の他の実施の形態を
示す正面図、（Ｂ）はその側面断面図である。FIG. 4A is a front view showing another embodiment of the getting on / off device of the present invention, and FIG. 4B is a side sectional view thereof.

【符号の説明】[Explanation of symbols]

１：本体、２：ブーム、３：作業台、４：操作装置、
５：乗降装置、６：軸、７：ブラケット、８：縦ロッ
ド、９：引張ばね、１０：ステップ部材、１１：ストッ
パ、１２：閉塞部材、１３：縦枠、１４：軸、１６：受
け具、２０：圧縮ばね、２１：ばねシリンダ、２２：ロ
ッド、２３：乗降口、２４：上げ下げ枠、２５：ストッ
パ、２６：縦ロッド、２７：ステップ部材、２９：閉塞
部材、３１：引張ばね、３２：軸、３４：係止部材、３
５：横枠、３６：ステップ部材、３７：上げ下げ枠、３
８：下枠、３９：パイプ、４０：縦ロッド、４４：コイ
ルばね、４５：係止部材、４６：ストッパ、４７：床板1: body, 2: boom, 3: work table, 4: operating device,
5: getting on and off device, 6: shaft, 7: bracket, 8: vertical rod, 9: tension spring, 10: step member, 11: stopper, 12: closing member, 13: vertical frame, 14: shaft, 16: receiving member , 20: compression spring, 21: spring cylinder, 22: rod, 23: entrance / exit, 24: lifting frame, 25: stopper, 26: vertical rod, 27: step member, 29: closing member, 31: tension spring, 32 : Shaft, 34: locking member, 3
5: horizontal frame, 36: step member, 37: raising and lowering frame, 3
8: Lower frame, 39: Pipe, 40: Vertical rod, 44: Coil spring, 45: Locking member, 46: Stopper, 47: Floor plate

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】ブームの先端に作業台を取付けた作業車両
における作業台用乗降装置であって、 前記作業台に、ステップ部材を、該ステップ部材が作業
台の底面から下方に垂下された姿勢と、作業台に戻した
姿勢とがとれるように変位可能に取付けると共に、 前記ステップ部材を垂下状態から作業台側に戻すばねを
設けたことを特徴とする作業台用乗降装置。1. A work platform elevating device for a work vehicle in which a work table is attached to a tip of a boom, wherein a step member is provided on the work table, and the step member is suspended downward from a bottom surface of the work table. And a spring for returning the step member from the hanging state to the work table side, and a spring for returning the step member from the hanging state to the work table side. 【請求項２】請求項１において、前記ステップ部材を含
む上げ下げ枠を、作業台の前面または側面の乗降口に設
け、 前記上げ下げ枠を上げた状態においては、前記上げ下げ
枠が前記乗降口を塞ぐように構成したことを特徴とする
作業台用乗降装置。2. A lift frame including the step member is provided at an entrance on a front surface or a side surface of a worktable, and the elevator frame closes the entrance when the frame is raised. A workbench getting on and off device characterized by having such a configuration. 【請求項３】請求項１または２において、前記ステップ
部材が作業台から垂下された状態においてステップ部材
を支持するストッパを設けたことを特徴とする作業台用
乗降装置。3. The platform getting-on / off device according to claim 1, further comprising a stopper for supporting the step member in a state where the step member is suspended from the table.