JP2014214579A - Lifting device for work machine - Google Patents

Lifting device for work machine Download PDF

Info

Publication number
JP2014214579A
JP2014214579A JP2013095502A JP2013095502A JP2014214579A JP 2014214579 A JP2014214579 A JP 2014214579A JP 2013095502 A JP2013095502 A JP 2013095502A JP 2013095502 A JP2013095502 A JP 2013095502A JP 2014214579 A JP2014214579 A JP 2014214579A
Authority
JP
Japan
Prior art keywords
ladder
lower ladder
working machine
cab
ladders
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2013095502A
Other languages
Japanese (ja)
Other versions
JP5937541B2 (en
JP2014214579A5 (en
Inventor
一晶 奥田
Kazuaki Okuda
一晶 奥田
石井 基寛
Motohiro Ishii
基寛 石井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP2013095502A priority Critical patent/JP5937541B2/en
Publication of JP2014214579A publication Critical patent/JP2014214579A/en
Publication of JP2014214579A5 publication Critical patent/JP2014214579A5/ja
Application granted granted Critical
Publication of JP5937541B2 publication Critical patent/JP5937541B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R3/00Arrangements of steps or ladders facilitating access to or on the vehicle, e.g. running-boards
    • B60R3/02Retractable steps or ladders, e.g. movable under shock
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/16Cabins, platforms, or the like, for drivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device for a work machine in which: the lifting device is configured to reduce labor for moving up and down a ladder.SOLUTION: An intermediate part of a lower ladder 10 is pivotally attached to a step 9b provided on a side of an operator cab so that it can take a horizontal posture in which it overlaps on the step and an upright posture. An upper ladder 11 is assembled over the lower ladder 10 so that it can move along the lower ladder 10. Between the lower ladder 10 and the upper ladder 11, a mechanism is provided to restrict the moving range of the upper ladder 11. A rotation stopper 18 is provided to prevent further rotation toward an upright direction with the step 9b lower ladder in the upright position. Between the step 9b and the lower ladder 10, a mechanism is provided to prevent the lower ladder from rising when the lower ladder 10 is in the horizontal posture. A mechanism is provided to prevent the upper ladder 11 from moving in an extending direction when the upper ladder 11 is contracted and assembled to the lower ladder 10.

Description

本発明は、上部旋回体を有する油圧ショベル等の作業機において、運転室に昇降するための昇降装置に関する。   The present invention relates to an elevating device for elevating and lowering a driver's cab in a working machine such as a hydraulic excavator having an upper swing body.

下部走行体とその下部走行体に旋回装置を介して取付けられる上部旋回体を有する油圧ショベル等の作業機は、上部旋回体に運転室を有するとともに、地上からその運転室へ昇降するために梯子等の昇降装置を備える。このような昇降装置として、特許文献1には、上部旋回体のサイドウォークの外側に固定梯子を取付け、これに下方に伸長可能に可動梯子を組み合わせたスライド式の梯子からなるものが開示されている。この特許文献1に記載のものは、オペレータ等が運転室に昇降する際には可動梯子を引き下げ、作業機の稼働時には可動梯子を引き上げて旋回時における可動梯子と下部走行体との干渉を防止する。   A working machine such as a hydraulic excavator having a lower traveling body and an upper revolving body attached to the lower traveling body via a swivel device has a cab in the upper revolving body and a ladder for moving up and down from the ground to the cab. Elevating device such as. As such an elevating device, Patent Document 1 discloses a slide type ladder in which a fixed ladder is attached to the outside of a side walk of an upper swing body and a movable ladder is combined with the fixed ladder so as to extend downward. Yes. The one disclosed in Patent Document 1 lowers the movable ladder when an operator or the like moves up and down to the operator's cab and raises the movable ladder when the work machine is in operation to prevent interference between the movable ladder and the lower traveling body during turning. To do.

従来の昇降装置の別の例として、特許文献2には、サイドウォークの外側に起立姿勢と垂下姿勢とが取りうるように回動可能に第1の梯子を取付け、この第1の梯子に対して垂下した姿勢と第1の梯子に対して折り畳んだ姿勢が取りうるように回動可能に取付けたものが開示されている。この特許文献2に記載の昇降装置を昇降に使用する場合は、第1の梯子を下方に回動させて垂下姿勢にすると共に、第2の梯子を第1の梯子に対して折り畳んだ結合状態から離して垂下姿勢に変える。オペレータ等が運転室に昇った後は、第1の梯子を回動させて起立させると共に、第2の梯子を第1の梯子に折り畳み状に重ねて結合することにより、梯子と下部走行体との干渉を防止する。   As another example of a conventional lifting device, Patent Document 2 discloses that a first ladder is attached to the outside of a sidewalk so that a standing posture and a hanging posture can be taken. An apparatus is disclosed that is pivotably attached so that a suspended position and a folded position with respect to the first ladder can be taken. When the lifting device described in Patent Document 2 is used for lifting, the first ladder is rotated downward to be in a suspended position, and the second ladder is folded with respect to the first ladder. Move away from the drooping posture. After the operator or the like has risen to the operator's cab, the first ladder is rotated and stood up, and the second ladder is folded and joined to the first ladder, thereby connecting the ladder and the lower traveling body. To prevent interference.

特開2000−257118号公報JP 2000-257118 A 特開2000−255459号公報Japanese Patent Laid-Open No. 2000-255459

しかし、特許文献1に記載の昇降装置においては、可動梯子を引き下げた使用姿勢と引き上げた退避姿勢との間で人力により昇降させる必要がある。このため、作業機が比較的大型になると、可動梯子の昇降範囲も大きくなり、可動梯子の重量も増大するため、可動梯子を押し上げる際に必要とされる労力が大となる。   However, in the lifting device described in Patent Document 1, it is necessary to lift and lower manually between the use posture in which the movable ladder is lowered and the retracted posture in which the movable ladder is pulled up. For this reason, if the working machine is relatively large, the range of raising and lowering the movable ladder is increased and the weight of the movable ladder is increased, so that the labor required to push up the movable ladder is increased.

また、固定梯子の下端の位置は、下部走行体との干渉を回避しない高さとなるように制限されるため、固定梯子の長さも制限を受け、その結果、可動梯子の伸縮範囲も制限され、伸縮範囲の長い昇降装置を実現することが困難である。   In addition, since the position of the lower end of the fixed ladder is limited to a height that does not avoid interference with the lower traveling body, the length of the fixed ladder is also limited, and as a result, the extendable range of the movable ladder is also limited. It is difficult to realize a lifting device with a long expansion / contraction range.

また、特許文献2に記載のように、サイドウォークに第1の梯子を回動可能に取付けると共に、第1の梯子に対して第2の梯子を垂下状、折り畳み状に変位可能に取付けたものにおいても、やはり作業機の大型化により梯子の重量が増し、特許文献1のものと同様に上に引き上げるための労力が大となる。   In addition, as described in Patent Document 2, the first ladder is attached to the sidewalk so as to be rotatable, and the second ladder is attached to the first ladder so as to be displaceable in a hanging or folding manner. However, as the working machine becomes larger, the weight of the ladder increases, and the labor for raising the work machine as in the case of Patent Document 1 increases.

本発明は、上記問題点に鑑み、梯子を上げ下げするための労力が軽減できると共に、梯子の伸縮範囲も長くすることが可能となる構成の作業機の昇降装置を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide an elevating device for a working machine having a configuration that can reduce labor for raising and lowering a ladder and can extend a range of expansion and contraction of the ladder.

請求項1の作業機の昇降装置は、
下部走行体上に上部旋回体を設置し、前記上部旋回体に運転室を設けた作業機械の昇降装置において、
前記運転室の側方に設けたステップと、
前記ステップの端部に設けた横軸に中間部が枢着され、前記ステップ上に重ねた水平姿勢と起立姿勢とがとり得るように取付けた下梯子と、
前記下梯子の上に下梯子に沿って移動可能に組み合わされた上梯子と、
前記下梯子と前記上梯子の間に設けられ、前記上梯子が前記下梯子に沿って移動する範囲を規制する移動範囲規制機構と、
前記ステップに設けられ、前記下梯子を起立させた状態で下梯子の下部を当接させて起立方向へのさらなる回動を防止するための回動ストッパと、
前記ステップと前記下梯子の間に設けられ、下梯子が水平姿勢の際に、下梯子の浮き上がりを防止する浮上防止機構と、
前記下梯子と前記上梯子の間に設けられ、前記上梯子が前記下梯子に対して収縮して組み合わされている際に、前記上梯子の伸長方向への移動を防止する伸長防止機構とを備えたことを特徴とする。
The lifting device of the working machine according to claim 1 comprises:
In an elevating device for a work machine in which an upper swing body is installed on a lower traveling body, and a cab is provided in the upper swing body,
A step provided on the side of the cab;
An intermediate portion pivotally attached to a horizontal axis provided at an end of the step, and a lower ladder attached so as to be able to take a horizontal posture and a standing posture superimposed on the step;
An upper ladder combined on the lower ladder so as to be movable along the lower ladder;
A movement range regulating mechanism provided between the lower ladder and the upper ladder, and regulating a range in which the upper ladder moves along the lower ladder;
A rotation stopper provided in the step for preventing further rotation in the standing direction by contacting the lower portion of the lower ladder in a state where the lower ladder is raised;
A levitating prevention mechanism provided between the step and the lower ladder to prevent the lower ladder from lifting when the lower ladder is in a horizontal posture;
An extension preventing mechanism that is provided between the lower ladder and the upper ladder and prevents the upper ladder from moving in the extension direction when the upper ladder is contracted and combined with the lower ladder; It is characterized by having.

請求項2に記載の作業機の昇降装置は、請求項1に記載の作業機の昇降装置において、
前記上梯子を、互いに移動可能に重ねて組み合わされた複数段の上梯子により構成すると共に、複数段の上梯子を連動して相対的に伸縮させる連動機構を備えたことを特徴とする。
The lifting device for a working machine according to claim 2 is the lifting device for a working machine according to claim 1,
The upper ladder is constituted by a plurality of upper ladders that are combined so as to be movable with each other, and an interlocking mechanism that interlocks and relatively expands and contracts the upper ladders is provided.

請求項3に記載の作業機の昇降装置は、請求項1または請求項2に記載の運転室への昇降装置において、
前記下梯子が起立した状態における前記下梯子の上部位置に、前記横軸を回動の支点とする際の支点の両側の重量バランスをとる錘を設けたことを特徴とする。
The lifting device for the working machine according to claim 3 is the lifting device to the cab according to claim 1 or 2,
A weight that balances the weight of both sides of the fulcrum when the horizontal axis is used as a fulcrum for rotation is provided at an upper position of the lower ladder in a state where the lower ladder is standing.

請求項4に記載の作業機の昇降装置は、請求項1から請求項3までのいずれか1項に記載の作業機の昇降装置において、
前記下梯子に前記上梯子を重ねて前記ステップ上に水平に格納した状態における梯子全体の高さを、運転室ドアの下辺の高さより低く設定したことを特徴とする。
The lifting device for a working machine according to claim 4 is the lifting device for a working machine according to any one of claims 1 to 3.
The height of the entire ladder in a state where the upper ladder is overlapped with the lower ladder and horizontally stored on the step is set lower than the height of the lower side of the cab door.

請求項5に記載の作業機の昇降装置は、請求項1から請求項4までのいずれか1項に記載の運転室への昇降装置において、
前記ステップと前記下梯子の間に設けられ、前記下梯子が起立姿勢の際に、下梯子が水平姿勢側に回動することを防止する回動防止機構を備えたことを特徴とする。
The lifting device for the working machine according to claim 5 is the lifting device to the cab according to any one of claims 1 to 4,
A rotation prevention mechanism is provided between the step and the lower ladder and prevents the lower ladder from rotating to the horizontal posture side when the lower ladder is in a standing posture.

請求項1の発明によれば、下梯子を水平姿勢と起立姿勢とが取りうるように、下梯子の中間部を、運転室の側部のステップに設けた横軸に枢着したので、オペレータ等がステップに上がった後、上梯子を上げる時は、下梯子と共に上梯子を回動させて水平にして上梯子をスライドさせればよい。ここで、下梯子はステップに中間部を枢着しているので、上下の梯子を回動させる際に必要とされる力は、起立した状態で上梯子を押し上げるのに必要とされる力に比較して小さい力ですむ。また、下梯子を水平にした時に上梯子を水平に移動させる力は押し上げる力に比較して小さい力ですむ。このため、梯子を退避姿勢にするための労力が小さくてすむ。その結果、作業機が大型化しても、人力で容易に操作できる昇降装置が実現できる。   According to the first aspect of the present invention, the intermediate portion of the lower ladder is pivotally attached to the horizontal axis provided at the step on the side of the cab so that the lower ladder can take a horizontal posture and a standing posture. When the upper ladder is lifted after the step goes up, the upper ladder may be rotated together with the lower ladder so that the upper ladder is slid. Here, since the lower ladder is pivotally attached to the step, the force required to rotate the upper and lower ladders is the force required to push up the upper ladder in an upright state. Compared with small force. In addition, when the lower ladder is leveled, the force to move the upper ladder horizontally is smaller than the force to push up. For this reason, the labor for making a ladder into a retracted posture can be reduced. As a result, it is possible to realize an elevating device that can be easily operated by human power even when the working machine is enlarged.

また、梯子が水平姿勢にあるときは、梯子が下部走行体に干渉するおそれがないため、下梯子の長さが下部走行体との干渉を回避する上で制限を受けることがなく、下梯子を固定梯子にする場合に比較し、下梯子を長くすることが可能となる。このため、下梯子に対する上梯子の伸縮範囲も長くすることが可能となるので、伸縮範囲の面からも、作業機の大型化に容易に対応することが可能となる。   In addition, when the ladder is in a horizontal position, the ladder does not interfere with the lower traveling body, so that the length of the lower ladder is not restricted in avoiding interference with the lower traveling body, and the lower ladder The lower ladder can be made longer as compared with the case where is used as a fixed ladder. For this reason, since the expansion / contraction range of the upper ladder with respect to the lower ladder can be increased, it is possible to easily cope with an increase in the size of the work machine from the aspect of the expansion / contraction range.

請求項2の発明によれば、上梯子を複数段に構成したので、梯子の伸縮幅が大きくなり、大型化した作業機にもより容易に対応できる。また、複数段の可動梯子の連動機構を設けたので、梯子の伸縮を整然と安定して行なうことができる。   According to the invention of claim 2, since the upper ladder is configured in a plurality of stages, the expansion / contraction width of the ladder is increased, and it is possible to more easily cope with an enlarged working machine. In addition, since the interlocking mechanism for the movable ladders of a plurality of stages is provided, the ladder can be expanded and contracted in an orderly and stable manner.

請求項3の発明によれば、重量バランスを取るための錘を下梯子に設けたので、下梯子を起立姿勢から水平姿勢に回動させるための操作力を小さくすることができる。また、梯子が伸長する際の重量バランスの変化によって、上下の梯子が起立側に急激に回動することが防止され、操作性が向上する。   According to the invention of claim 3, since the weight for balancing the weight is provided on the lower ladder, the operation force for rotating the lower ladder from the standing posture to the horizontal posture can be reduced. Further, due to the change in the weight balance when the ladder is extended, the upper and lower ladders are prevented from rotating suddenly to the upright side, and the operability is improved.

請求項4の発明によれば、梯子が水平姿勢をとる格納状態において、梯子をドアの下辺よりも低い位置に設定したので、梯子が水平姿勢の格納状態において、ドアの開閉に梯子が障害になることがない。このため、梯子を運転室に近接した位置に取付けることができ、昇降装置をコンパクトな構成とすることができる。   According to the fourth aspect of the present invention, since the ladder is set at a position lower than the lower side of the door in the retracted state in which the ladder is in the horizontal posture, the ladder is obstructed to open and close the door in the retracted state in which the ladder is in the horizontal posture. Never become. For this reason, a ladder can be attached in the position close | similar to a driver's cab, and a raising / lowering apparatus can be made into a compact structure.

請求項5の発明によれば、梯子の起立姿勢において、梯子の回動を防止する機構を設けたので、起立姿勢から意図しない回動が防止され、安全性が向上する。   According to the invention of claim 5, since the mechanism for preventing the ladder from rotating in the standing posture of the ladder is provided, unintentional rotation from the standing posture is prevented, and safety is improved.

本発明の昇降装置の一実施の形態を示す作業機の側面図である。It is a side view of the working machine which shows one Embodiment of the raising / lowering apparatus of this invention. 本実施の形態の昇降装置の旋回フレームに対する取付け構造を梯子が水平となる格納状態で示す斜視図である。It is a perspective view which shows the attachment structure with respect to the turning frame of the raising / lowering apparatus of this Embodiment in the retracted state where a ladder becomes horizontal. 本実施の形態の昇降装置を梯子が水平となる格納状態で示す斜視図である。It is a perspective view which shows the raising / lowering apparatus of this Embodiment in the retracted state where a ladder becomes horizontal. 本実施の形態の昇降装置を梯子が水平となる格納状態で示す平面図である。It is a top view which shows the raising / lowering apparatus of this Embodiment in the retracted state in which a ladder becomes horizontal. (A)は図4のA矢視図、(B)は図4のB矢視図である。(A) is an A arrow view of FIG. 4, (B) is an B arrow view of FIG. 本実施の形態の昇降装置を梯子が起立した使用状態で示す斜視図である。It is a perspective view which shows the raising / lowering apparatus of this Embodiment in the use condition in which the ladder stood up. 図5(B)におけるC−C拡大断面図である。It is CC expanded sectional drawing in FIG.5 (B). 本実施の形態の上梯子の伸長防止機構を示す側面図である。It is a side view which shows the extension | extension prevention mechanism of the upper ladder of this Embodiment. 本実施の形態の下梯子の浮上防止機構を示す側面図である。It is a side view which shows the floating prevention mechanism of the lower ladder of this Embodiment. 本発明による昇降装置の他の実施の形態を示す側面図である。It is a side view which shows other embodiment of the raising / lowering apparatus by this invention. 図10の実施の形態の昇降装置の平面図である。It is a top view of the raising / lowering apparatus of embodiment of FIG. 図10のD−D断面図である。It is DD sectional drawing of FIG.

図1は本発明の昇降装置の一実施の形態を梯子の格納状態で示す作業機の側面図であり、図2は旋回フレーム3aと昇降装置8の位置関係を説明する斜視図である。図1のとおり、この作業機は、下部走行体1に旋回装置2を介して旋回フレーム3aが取付けられ、旋回フレーム3aに、エンジンや油圧ポンプなどを備えたパワーユニット4、カウンタウエイト5および運転室6が搭載されて上部旋回体3を構成する。図2において、7は旋回フレーム3aに運転室6を取付けるために旋回フレーム3aに設けた取付け穴である。旋回フレーム3aの前部には、例えばブーム、アーム、バケット等の作業具及びそれらを回動させるための油圧シリンダを備えた作業用フロント(不図示)が取付けられる。作業用フロントは、伸縮式アーム等により構成されたものであってもよい。   FIG. 1 is a side view of a working machine showing an embodiment of a lifting device according to the present invention in a retracted state of a ladder, and FIG. 2 is a perspective view for explaining the positional relationship between a swing frame 3a and a lifting device 8. As shown in FIG. 1, in this working machine, a swivel frame 3a is attached to a lower traveling body 1 via a swivel device 2, and a power unit 4, a counterweight 5 and a driver's cab equipped with an engine, a hydraulic pump, etc. are mounted on the swivel frame 3a. 6 is mounted to constitute the upper swing body 3. In FIG. 2, 7 is a mounting hole provided in the swivel frame 3a for attaching the cab 6 to the swivel frame 3a. A work front (not shown) including a work tool such as a boom, an arm, and a bucket and a hydraulic cylinder for rotating them is attached to the front portion of the revolving frame 3a. The work front may be constituted by an extendable arm or the like.

図1、図2において、8は昇降装置、9はこの昇降装置8の一部を構成するステップである。このステップ9は、旋回フレーム3aにおける運転室6の周囲に位置する部分に取付けられるものであり、本実施の形態においてはこのステップ9は、図2に示すように、運転室6の側部の前側に位置する第1の側部ステップ9aと、その後部に位置する第2の側部ステップ9bと、運転室6の前部に位置するステップ9cとからなる。10はステップ9bに取付けられる下梯子、11はこの下梯子10に移動可能に組み合わされる上梯子である。   In FIGS. 1 and 2, reference numeral 8 denotes a lifting device, and reference numeral 9 denotes a step constituting a part of the lifting device 8. This step 9 is attached to a portion of the swivel frame 3a located around the cab 6. In the present embodiment, this step 9 is performed on the side of the cab 6 as shown in FIG. It consists of a first side step 9 a located on the front side, a second side step 9 b located on the rear side, and a step 9 c located on the front side of the cab 6. Reference numeral 10 denotes a lower ladder attached to the step 9b, and reference numeral 11 denotes an upper ladder that is movably combined with the lower ladder 10.

図3〜図5は梯子10,11を格納状態、すなわち梯子10,11が水平となる状態を示すもので、図3はその斜視図、図4はその平面図、図5(A)、(B)はそれぞれ図4のA矢視図、B矢視図である。図6は梯子10,11の使用状態、すなわち梯子10,11が起立しかつ伸長した状態を示す斜視図である。   3 to 5 show a state in which the ladders 10 and 11 are retracted, that is, a state in which the ladders 10 and 11 are horizontal, FIG. 3 is a perspective view thereof, FIG. 4 is a plan view thereof, and FIG. B) is a view as seen from an arrow A and a view as seen from an arrow B in FIG. FIG. 6 is a perspective view showing a state where the ladders 10 and 11 are used, that is, a state where the ladders 10 and 11 stand up and extend.

図3において、12はステップ9bの旋回フレーム3a側に設けた取付け板、13は旋回フレーム3aに設けられたステップ取付け用の座板であり、取付け板12をボルト14によって座板13に固定することにより、ステップ9bが旋回フレーム3aに取付けられる。   In FIG. 3, reference numeral 12 denotes a mounting plate provided on the side of the turning frame 3 a in step 9 b, and 13 denotes a step mounting seat plate provided on the turning frame 3 a, and the mounting plate 12 is fixed to the seat plate 13 with bolts 14. Thus, the step 9b is attached to the turning frame 3a.

図3、図4に示すように、下梯子10は、左右の縦枠10a,10a間にステップバー10bを架設したものであり、図6に起立状態で示すように、ステップバー10bは下梯子10の下半部のみに設け、下梯子10の上部にはステップバー10bを設けず、縦枠10a,10a間を通過可能に構成している。この下梯子10は、図3、図4、図6に示すように、ステップ9bの後端部に設けられた横軸30に左右の縦枠10a,10aの中間部を回動可能に枢着して取付けられる。   As shown in FIGS. 3 and 4, the lower ladder 10 has a step bar 10b laid between the left and right vertical frames 10a and 10a. As shown in a standing state in FIG. 6, the step bar 10b has a lower ladder. 10 is provided only in the lower half, and the upper portion of the lower ladder 10 is not provided with a step bar 10b, but is configured to pass between the vertical frames 10a and 10a. As shown in FIGS. 3, 4, and 6, the lower ladder 10 is pivotally attached to the horizontal shaft 30 provided at the rear end of the step 9b so that the middle part of the left and right vertical frames 10a and 10a can be rotated. Installed.

上梯子11は左右の縦枠11a,11a間にステップバー11bを架設したものであり、ステップバー11bは縦枠11aのほぼ全長にわたって複数本(図示例は4本)設けられている。   The upper ladder 11 has step bars 11b installed between left and right vertical frames 11a and 11a. A plurality of step bars 11b (four in the illustrated example) are provided over almost the entire length of the vertical frame 11a.

図5(A)、(B)に示すように、上梯子11の前端部にはローラ15を設け、このローラ15は、下梯子10の上面に接し、上梯子11の移動により転動する。また、下梯子10の後端にもローラ16を設け、このローラ16は上梯子15の下面に接し、上梯子11の移動により転動する。   As shown in FIGS. 5A and 5B, a roller 15 is provided at the front end portion of the upper ladder 11. The roller 15 is in contact with the upper surface of the lower ladder 10 and rolls by the movement of the upper ladder 11. A roller 16 is also provided at the rear end of the lower ladder 10, and this roller 16 is in contact with the lower surface of the upper ladder 15 and rolls by the movement of the upper ladder 11.

図3に示すように、上梯子11の縦枠11aは断面形状がコ字形をなす。上梯子11を下梯子10に沿って移動させるため、下梯子10の後端部にはボルト24によりスライドパッド26を有するブラケット22を取付けると共に、上梯子11の前端部には、図5(B)のC−C拡大断面図である図7に示す後述のスライドプレート51を備える。スライドパッド26は、上梯子11の縦枠11aの下板部11cの上面および外縁に当接し、摺動させてガイドの役目を果たすものである。   As shown in FIG. 3, the vertical frame 11a of the upper ladder 11 has a U-shaped cross section. In order to move the upper ladder 11 along the lower ladder 10, a bracket 22 having a slide pad 26 is attached to the rear end portion of the lower ladder 10 with a bolt 24, and at the front end portion of the upper ladder 11, FIG. ), Which is an enlarged cross-sectional view taken along the line C-C of FIG. The slide pad 26 abuts on the upper surface and outer edge of the lower plate portion 11c of the vertical frame 11a of the upper ladder 11 and slides to serve as a guide.

下梯子10における前記スライドパッド26の前側に、ボルト23によりローラ25を有するブラケット21を取付ける。このローラ25は上梯子11の縦枠11aの下板部11c(図5(A),(B)参照)の上面に当接して上梯子11の移動に伴い転動させるもので、上梯子11の下梯子10に対する浮き上がりを防止するものである。   A bracket 21 having a roller 25 is attached by a bolt 23 to the front side of the slide pad 26 in the lower ladder 10. The roller 25 is in contact with the upper surface of the lower plate portion 11c (see FIGS. 5A and 5B) of the vertical frame 11a of the upper ladder 11 and rolls as the upper ladder 11 moves. This prevents lifting of the lower ladder 10.

図8、図9はそれぞれ図5(A)、(B)の部分拡大図である。図7〜図9において、50はスライドプレート51を取付けるための取付け板であり、この取付け板50は、上梯子11におけるローラ15の軸であるピン57を支持する縦板52にボルト50aにより取付けられる。56はこの取付け板50と縦板52の間を調整するためのシムである。そして取付け板50にボルト55bとナット55aによってスライドプレート51が取付けられる。スライドプレート51は、下梯子10の外側の側面に摺動可能に当接する。   8 and 9 are partially enlarged views of FIGS. 5A and 5B, respectively. 7 to 9, reference numeral 50 denotes a mounting plate for mounting the slide plate 51. The mounting plate 50 is mounted on the vertical plate 52 that supports the pin 57, which is the shaft of the roller 15 in the upper ladder 11, with bolts 50a. It is done. Reference numeral 56 denotes a shim for adjusting the space between the mounting plate 50 and the vertical plate 52. The slide plate 51 is attached to the attachment plate 50 by bolts 55b and nuts 55a. The slide plate 51 abuts slidably on the outer side surface of the lower ladder 10.

図1に示すように、梯子10,11が水平姿勢となる格納状態においては、運転室6のドア6aの下辺の高さhより上梯子11の上面の位置を低くして梯子10,11がドア6aの開閉の邪魔にならないように構成している。   As shown in FIG. 1, in the retracted state where the ladders 10 and 11 are in a horizontal position, the position of the upper surface of the upper ladder 11 is made lower than the height h of the lower side of the door 6a of the cab 6 so that the ladders 10 and 11 are The door 6a is configured not to obstruct the opening / closing of the door 6a.

図3〜図6に示すように、上梯子11の移動範囲を規制するための移動範囲規制機構として、下梯子10に収縮側ストッパ17と伸長側ストッパ19が設けられる。収縮側ストッパ17は下梯子10の前端部に設けられ、上梯子11の前端部11dを当接させて収縮位置を規制する。伸長側ストッパ19は、下梯子10の後部の外側の側面に設けられ、図6に示すように、上梯子11を伸長させた際に、上梯子11の前部の外側の側面に突出させて設けた係止板32を当接させるものである。これらのストッパ17,19には、緩衝のためにゴム等の弾性材が用いられる。   As shown in FIGS. 3 to 6, a contraction side stopper 17 and an extension side stopper 19 are provided on the lower ladder 10 as a movement range regulation mechanism for regulating the movement range of the upper ladder 11. The contraction-side stopper 17 is provided at the front end portion of the lower ladder 10 and restricts the contraction position by bringing the front end portion 11d of the upper ladder 11 into contact. The extension-side stopper 19 is provided on the outer side surface of the rear portion of the lower ladder 10. When the upper ladder 11 is extended, as shown in FIG. 6, the extension side stopper 19 protrudes to the outer side surface of the front portion of the upper ladder 11. The provided locking plate 32 is brought into contact. These stoppers 17 and 19 are made of an elastic material such as rubber for buffering.

図3、図5、図6において、18は下梯子10が水平姿勢から起立姿勢へ移行する際の回動において、下梯子10を当接させて回動限界位置を規制する回動ストッパである。この回動ストッパ18は、ステップ9bの後端部に後方に突出させて設けられる。この回動ストッパ18にも緩衝のためにゴム等の弾性材が用いられる。60は下梯子10が起立状態から水平姿勢に回動する際に、ストッパ9bに当接した際の衝撃を緩和するため、ステップ9b上に設けたゴム等からなる緩衝材である。   3, 5, and 6, reference numeral 18 denotes a rotation stopper that restricts the rotation limit position by contacting the lower ladder 10 when the lower ladder 10 is rotated from the horizontal posture to the standing posture. . The rotation stopper 18 is provided to protrude rearward at the rear end portion of the step 9b. The rotating stopper 18 is also made of an elastic material such as rubber for buffering. Reference numeral 60 denotes a cushioning material made of rubber or the like provided on the step 9b in order to alleviate an impact when the lower ladder 10 is rotated from the standing state to the horizontal posture and comes into contact with the stopper 9b.

図6に示すように梯子10,11が起立した状態において、梯子10,11が起立姿勢側から水平姿勢側に回動することを防止するため、下梯子10とステップ9bとの間に回動防止機構を構成するリンク28が設ける。このリンク28は、図3、図5に示すように、上梯子11の旋回フレーム3aの反対側の縦枠11aにピン28bを中心として回動可能に取付けられる。27はステップ9bに固着されたガイド板であり、このガイド板はリンク28の自由端に設けたピン28aを移動可能に嵌合するガイド溝27aを有する。ガイド溝27aの後端部には、梯子10,11が起立した際にピン28aを嵌めてリンク28を固定するための凹部27bを有する。   In order to prevent the ladders 10 and 11 from rotating from the standing posture side to the horizontal posture side in the state where the ladders 10 and 11 are erected as shown in FIG. 6, the ladders 10 and 11 are rotated between the lower ladder 10 and the step 9 b. A link 28 constituting a prevention mechanism is provided. As shown in FIGS. 3 and 5, the link 28 is attached to the vertical frame 11 a on the opposite side of the revolving frame 3 a of the upper ladder 11 so as to be rotatable about a pin 28 b. Reference numeral 27 denotes a guide plate fixed to the step 9b, and this guide plate has a guide groove 27a in which a pin 28a provided at the free end of the link 28 is movably fitted. The rear end portion of the guide groove 27a has a concave portion 27b for fitting the pin 28a and fixing the link 28 when the ladders 10 and 11 stand up.

図3〜図5に示すように、梯子10,11が水平となる格納状態においては、リンク28の自由端に設けたピン28aはガイド板27のガイド溝27aの前端部に嵌合されている。一方、リンク28をこの水平姿勢から起立側に回動させると、リンク28が次第に起立しながらピン28aがガイド溝27aに沿って摺動する。そして図6に示すような起立姿勢になると、ピン28aは凹部27bに嵌合される。このため、梯子10,11に起立姿勢側から水平姿勢側に回動する力が加わってもピン28aの位置が動かず、リンク28が固定される。これらのリンク28とガイド孔27aによる回動防止機構により、昇降時に下梯子10が回動することが防止される。   As shown in FIGS. 3 to 5, in the retracted state where the ladders 10 and 11 are horizontal, the pin 28 a provided at the free end of the link 28 is fitted into the front end portion of the guide groove 27 a of the guide plate 27. . On the other hand, when the link 28 is rotated from the horizontal posture to the upright side, the pin 28a slides along the guide groove 27a while the link 28 gradually stands up. When the standing posture is as shown in FIG. 6, the pin 28a is fitted into the recess 27b. For this reason, even if the force which rotates to the horizontal attitude | position side from the standing attitude | position side is added to the ladders 10 and 11, the position of the pin 28a does not move and the link 28 is fixed. The rotation prevention mechanism by the links 28 and the guide holes 27a prevents the lower ladder 10 from rotating during ascending / descending.

図2〜図4において、44は下梯子10の前端部に取付けられた錘である。この錘44は、図4に示すように、下梯子10の外側の縦枠10aの外側の側面に設けた取付け部材41にボルト44aによって取付けられる。この錘44は、下梯子10を起立姿勢から水平姿勢にするときの回動力を低減することができる。また、上梯子11が下梯子10に沿って伸長して、横軸30から上梯子11の後端までの距離が長くなり、横軸30より後側の重量が増す際に、この前端の錘44によって重量のバランスをとって、急激に梯子10,11が起立姿勢へ回動することを防止する。   2 to 4, reference numeral 44 denotes a weight attached to the front end portion of the lower ladder 10. As shown in FIG. 4, the weight 44 is attached to a mounting member 41 provided on the outer side surface of the vertical frame 10a outside the lower ladder 10 by bolts 44a. The weight 44 can reduce the turning force when the lower ladder 10 is changed from the standing posture to the horizontal posture. Further, when the upper ladder 11 extends along the lower ladder 10 and the distance from the horizontal axis 30 to the rear end of the upper ladder 11 becomes longer, and the weight on the rear side of the horizontal axis 30 increases, the weight of the front end is increased. The weight is balanced by 44 to prevent the ladders 10 and 11 from suddenly turning to the standing posture.

図5(A)において、35は梯子10,11が水平姿勢となる格納状態において、上梯子11が下梯子10に対して伸長する方向に移動しないようにする伸長防止機構を構成する金具である。この伸長防止金具35は、図8に示すように、下梯子10の側面にピン36を中心に回動可能に取付けられ、上梯子11が下梯子10に対して収縮した状態において、受部である係止板32を係止して、上梯子11の伸長方向の移動を防止するものである。この伸長防止金具35は上梯子11の係止板32を当接させて伸長防止金具35を回動させる傾斜面35bと、係止板32を係止する係止部35cとを有する。37はコイルばねであり、このコイルばね37はピン36に巻装され、かつ下梯子10の縦部材10cと伸長防止金具35に設けたピン35aに両端を掛けて取付けられ、伸長防止金具35を矢印61の方向に付勢する。10dは伸長防止金具35による係止板32の係止が解除された状態でも伸長防止金具35を適当な位置に保持するため、下梯子10の側面に設けた保持部材である。   In FIG. 5A, reference numeral 35 denotes a metal fitting constituting an extension preventing mechanism that prevents the upper ladder 11 from moving in the direction of extension with respect to the lower ladder 10 in the retracted state where the ladders 10 and 11 are in the horizontal posture. . As shown in FIG. 8, the extension preventing metal fitting 35 is attached to the side surface of the lower ladder 10 so as to be rotatable around a pin 36, and in a state where the upper ladder 11 is contracted with respect to the lower ladder 10, A certain locking plate 32 is locked to prevent the upper ladder 11 from moving in the extending direction. The extension preventing metal fitting 35 has an inclined surface 35b that contacts the locking plate 32 of the upper ladder 11 and rotates the extension preventing metal fitting 35, and a locking portion 35c that locks the locking plate 32. Reference numeral 37 denotes a coil spring. The coil spring 37 is wound around a pin 36 and attached to a vertical member 10c of the lower ladder 10 and a pin 35a provided on the extension preventing metal fitting 35 with both ends attached thereto. Energize in the direction of arrow 61. Reference numeral 10d denotes a holding member provided on the side surface of the lower ladder 10 in order to hold the extension preventing metal fitting 35 in an appropriate position even when the locking plate 32 is released from the extension preventing metal fitting 35.

図8において、上梯子11が下梯子10に対して伸長した状態から矢印62に示すように収縮方向に移動させた際に、上梯子11の係止板32が伸長防止金具35の傾斜面35bに至ると、伸長防止金具35はコイルばね37の力に抗して矢印61の反対方向に回動する。そしてさらに係止板32が傾斜面35bを越えると、伸長防止金具35がばね37の力により矢印61の方向に回動して原位置に復帰し、係止板32が係止部35cに係止され、上梯子11が矢印62の反対方向、すなわち伸長方向に移動することが防止される。伸長防止金具35の傾斜面35b側をコイルばね37の弾力に抗して下方に押せば、伸長防止金具35による係止板32の係止が解かれ、上梯子11が伸長方向に移動可能となる。   In FIG. 8, when the upper ladder 11 is moved with respect to the lower ladder 10 in the contracting direction as indicated by an arrow 62, the locking plate 32 of the upper ladder 11 is inclined by the inclined surface 35b of the extension preventing metal fitting 35. At this point, the extension preventing metal fitting 35 rotates in the direction opposite to the arrow 61 against the force of the coil spring 37. When the locking plate 32 further exceeds the inclined surface 35b, the extension preventing metal fitting 35 is rotated in the direction of the arrow 61 by the force of the spring 37 to return to the original position, and the locking plate 32 is engaged with the locking portion 35c. The upper ladder 11 is prevented from moving in the direction opposite to the arrow 62, that is, in the extending direction. If the inclined surface 35b side of the extension preventing metal fitting 35 is pushed downward against the elasticity of the coil spring 37, the locking plate 32 is released from the extension preventing metal fitting 35 and the upper ladder 11 can move in the extending direction. Become.

図5(B)および図6において、40は梯子10,11が水平姿勢をとっている際にこれらの梯子10,11の前部の浮き上がりを防止する浮上防止機構を構成する金具である。この浮上防止金具40は、図9に示すように、ステップ9bにピン46を中心に回動可能に取付けられる。ピン46にはコイルばね45が巻装され、その一端を浮上防止金具40に設けたピン40aに掛け、他端をステップ9bに掛けることにより、浮上防止金具40はコイルばね45により矢印58で示す回動方向に付勢される。矢印58方向の回動範囲は、浮上防止金具40に設けた足片40dがステップ9bの上面に当接することにより、規制される。43は下梯子10に取付け板41,42により取付けた係止ロッドであり、この係止ロッド43は浮上防止金具40に設けた傾斜面40bに摺動させ、係止部40cに係止させるものである。   In FIG. 5B and FIG. 6, reference numeral 40 denotes a metal fitting constituting a lift prevention mechanism that prevents the front portions of the ladders 10 and 11 from being lifted when the ladders 10 and 11 are in the horizontal posture. As shown in FIG. 9, the anti-lifting metal fitting 40 is attached to the step 9b so as to be rotatable around a pin 46. A coil spring 45 is wound around the pin 46. One end of the pin 46 is hooked on a pin 40a provided on the anti-floating metal fitting 40, and the other end is hooked on the step 9b. It is biased in the turning direction. The range of rotation in the direction of the arrow 58 is restricted when the foot piece 40d provided on the anti-lifting metal fitting 40 comes into contact with the upper surface of step 9b. Reference numeral 43 denotes a locking rod attached to the lower ladder 10 by means of mounting plates 41, 42. The locking rod 43 is slid on an inclined surface 40b provided on the anti-floating metal fitting 40 and is locked to the locking portion 40c. It is.

図9において、下梯子10が起立した姿勢から矢印59で示すように下梯子10の前部を降下させる方向に回動させると、係止ロッド43が浮上防止金具40の傾斜面40bに当接し、コイルばね45の力に抗して浮上防止金具40を矢印58の反対方向に回動させる。そして係止ロッド43が傾斜面40bを越えると、浮上防止金具40がコイルばね45の力で矢印58の方向に回動して原位置に復帰し、係止ロッド43が浮上防止金具40の係止部40cにより係止され、梯子10,11の浮き上がりが防止される。この状態から浮上防止金具40を矢印58の反対方向に回せば、浮上防止金具による係止ロッド43の拘束が解かれ、これらの梯子10,11の前部が浮上するように回動させることができる。   In FIG. 9, when the front portion of the lower ladder 10 is rotated in the direction of lowering as shown by the arrow 59 from the posture in which the lower ladder 10 stands, the locking rod 43 comes into contact with the inclined surface 40 b of the anti-lifting metal fitting 40. Then, the anti-lifting metal fitting 40 is rotated in the direction opposite to the arrow 58 against the force of the coil spring 45. When the locking rod 43 exceeds the inclined surface 40b, the anti-lifting metal fitting 40 is rotated in the direction of the arrow 58 by the force of the coil spring 45 to return to the original position, and the engaging rod 43 is engaged with the anti-lifting metal fitting 40. Locked by the stop 40c, the ladders 10 and 11 are prevented from floating. If the anti-lifting metal fitting 40 is turned in the direction opposite to the arrow 58 from this state, the restraint of the locking rod 43 by the anti-lifting metal fitting is released, and the front parts of these ladders 10 and 11 can be rotated. it can.

このように、この実施の形態においては、下梯子10を水平姿勢と起立姿勢とが取りうるように、下梯子10の中間部を、運転室6の側部ステップ9bの端部に設けた横軸30により枢着したので、オペレータ等がステップ9bに上がった後、上梯子11を上げる時は、下梯子10と共に上梯子11を回動させて水平にし、その後、上梯子11を収縮方向にスライドさせればよい。ここで、下梯子10はステップ9bに中間部を枢着しているので、上下の梯子10,11を回動させる際に必要とされる力は、起立した状態で上梯子11を押し上げるのに必要とされる力に比較して小さい力ですむ。また、下梯子10を水平にした時に上梯子11を水平に移動させる力は押し上げる力に比較して小さい力ですむ。このため、梯子を格納状態にするための労力が小さくてすむ。   Thus, in this embodiment, the horizontal portion of the lower ladder 10 is provided at the end of the side step 9b of the cab 6 so that the lower ladder 10 can take a horizontal posture and a standing posture. When the upper ladder 11 is lifted after the operator or the like goes up to step 9b, the upper ladder 11 is rotated and leveled together with the lower ladder 10, and then the upper ladder 11 is moved in the contracting direction. Just slide it. Here, since the lower ladder 10 is pivotally attached to the step 9b, the force required to rotate the upper and lower ladders 10 and 11 pushes the upper ladder 11 upright. Small force is required compared to the required force. Further, when the lower ladder 10 is leveled, the force for moving the upper ladder 11 horizontally can be smaller than the pushing-up force. For this reason, the labor for putting the ladder into the retracted state can be reduced.

また、梯子10,11が水平姿勢にあるときは、梯子10,11が下部走行体1に干渉するおそれがないため、下梯子10の長さが下部走行体1との干渉を回避する上で制限を受けることがなく、従来のように下梯子10を固定梯子にする場合に比較し、下梯子10を長くすることが可能となる。このため、下梯子10に対する上梯子11も長くすることが可能となる。   Further, when the ladders 10 and 11 are in a horizontal posture, the ladders 10 and 11 do not have a possibility of interfering with the lower traveling body 1, so that the length of the lower ladder 10 is to avoid interference with the lower traveling body 1. Without being restricted, the lower ladder 10 can be lengthened as compared with the conventional case where the lower ladder 10 is a fixed ladder. For this reason, the upper ladder 11 with respect to the lower ladder 10 can also be lengthened.

また、下梯子10に上梯子11が重ねられるので、格納時はコンパクトとなり、作業やドア開閉の障害にならず、使用時のみ起立させて使用させることができ、収縮状態を維持しながら回動させることができるため、その回動の範囲を狭くすることができ、非伸縮型の回動式梯子よりも少ないスペースで回動することができる。   In addition, since the upper ladder 11 is stacked on the lower ladder 10, it is compact when stored, does not obstruct work and door opening and closing, can be raised and used only during use, and rotates while maintaining a contracted state. Therefore, the range of the rotation can be narrowed, and the rotation can be performed in a smaller space than the non-stretchable rotation type ladder.

また、下梯子10に重量バランスを取るための錘44を設けたので、下梯子10を起立姿勢から水平姿勢にするときに要する操作力を小さくすることができる。また、上梯子11が伸長する際の重量バランスの変化によって、上下の梯子10,11が急激に回動することが防止され、操作性が向上する。   In addition, since the lower ladder 10 is provided with the weight 44 for balancing the weight, it is possible to reduce the operating force required when the lower ladder 10 is changed from the standing posture to the horizontal posture. Further, due to the change in the weight balance when the upper ladder 11 extends, the upper and lower ladders 10 and 11 are prevented from rotating rapidly, and the operability is improved.

また、梯子10,11が水平となる格納状態である際に、運転室6のドア6aの下辺よりも梯子10,11が低い位置となるように設定したので、梯子10,11が水平姿勢の格納状態において、ドア6aの開閉に梯子10,11が障害になることがない。このため、梯子10,11を運転室6に近接した位置に取付けることができ、コンパクトな構成を実現できる。   In addition, when the ladders 10 and 11 are in the horizontal storage state, the ladders 10 and 11 are set at a position lower than the lower side of the door 6a of the cab 6; In the retracted state, the ladders 10 and 11 do not obstruct the opening and closing of the door 6a. For this reason, the ladders 10 and 11 can be attached at positions close to the cab 6 and a compact configuration can be realized.

また、梯子10,11が起立した状態において、リンク28からなる梯子10,11の回動を防止する機構を設けたので、梯子10,11の起立姿勢からの意図しない回動が防止され、安全性が向上する。   In addition, since the mechanism for preventing the ladders 10 and 11 including the links 28 from rotating when the ladders 10 and 11 stand is provided, unintentional rotation from the standing posture of the ladders 10 and 11 is prevented, and safety is ensured. Improves.

図10は本発明の昇降装置の他の実施の形態を示す側面図である。図11はその平面図、図12は図10のD−D断面図である。図10〜図12において、図1〜図9と同じ符号は同じ構成部品または構成要素を示す。この実施の形態は、下梯子10上に重ねる上梯子を、互いに移動可能に重ねる複数段(図示例は2段)の梯子11,71により構成したものである。下側に位置する第1の上梯子11は前記実施の形態の構造と同様であり、この第1の上梯子11と下梯子10との組合わせ構造も前記実施の形態と同様である。上側に位置する第2の上梯子71は左右の縦枠71a,71a間にステップバー71bを設けたものである。   FIG. 10 is a side view showing another embodiment of the lifting device of the present invention. 11 is a plan view thereof, and FIG. 12 is a sectional view taken along the line DD of FIG. 10-12, the same code | symbol as FIGS. 1-9 shows the same component or component. In this embodiment, an upper ladder stacked on the lower ladder 10 is configured by ladders 11 and 71 of a plurality of stages (two stages in the illustrated example) that are movably stacked. The first upper ladder 11 located on the lower side is the same as the structure of the above embodiment, and the combined structure of the first upper ladder 11 and the lower ladder 10 is also the same as that of the above embodiment. The second upper ladder 71 located on the upper side is provided with a step bar 71b between the left and right vertical frames 71a and 71a.

第1の上梯子11は前述のように断面が略コの字状をなす。第2の上梯子71の前部(図10の左側)には間隔を有して2組のブラケット22Aをボルト24Aにより取付け、図12に示すように、各ブラケット24Aにそれぞれスライドパッド26Aを設け、各スライドパッド26Aを第1の上梯子11の縦枠11aの上板部11gの下面と外縁に摺動可能に係合させる。また、第1の上梯子11の後端部にローラ16Aを設け、このローラ16Aに第2の上梯子71の下面を転動可能に当接させ、かつ第2の上梯子71の前端部にローラ15Aを設け、このローラ15Aを第1の上梯子11の上面に転動可能に当接させることにより、第1の上梯子11に対して第2の上梯子71を移動可能に組み合わせる。   As described above, the first upper ladder 11 has a substantially U-shaped cross section. Two sets of brackets 22A are attached to the front portion of the second upper ladder 71 (left side in FIG. 10) with bolts 24A, and as shown in FIG. 12, slide pads 26A are provided on each bracket 24A. Each slide pad 26A is slidably engaged with the lower surface and the outer edge of the upper plate portion 11g of the vertical frame 11a of the first upper ladder 11. Further, a roller 16A is provided at the rear end portion of the first upper ladder 11, the lower surface of the second upper ladder 71 is brought into contact with the roller 16A so as to be able to roll, and at the front end portion of the second upper ladder 71. A roller 15A is provided, and the roller 15A is brought into contact with the upper surface of the first upper ladder 11 so as to be able to roll, so that the second upper ladder 71 is movably combined with the first upper ladder 11.

76,77は第1の上梯子11に第2の上梯子71を相対的に連動して伸縮させるために設けたプーリであり、78,79はそれぞれプーリ76,77に掛け回したワイヤである。プーリ76に掛け回すワイヤ78は、その一端を、下梯子10の側面に固着したブラケット81に接続具83により接続し、他端を、第2の上梯子71の側面に固着したブラケット82に接続具84により接続する。プーリ77に掛け回すワイヤ79は、その一端を、下梯子10の側面に固着したブラケット81に接続具85により接続し、他端を、第2の上梯子71の側面に固着したブラケット82に接続具86により接続する。このような連動機構により、第1の上梯子11の移動量に対して第2の上梯子71は2倍の移動量で伸縮する。   Reference numerals 76 and 77 are pulleys provided to relatively extend and contract the second upper ladder 71 relative to the first upper ladder 11, and 78 and 79 are wires wound around the pulleys 76 and 77, respectively. . One end of the wire 78 that hangs around the pulley 76 is connected to the bracket 81 fixed to the side surface of the lower ladder 10 by the connecting tool 83, and the other end is connected to the bracket 82 fixed to the side surface of the second upper ladder 71. The connection is made by the tool 84. One end of the wire 79 that hangs around the pulley 77 is connected to a bracket 81 fixed to the side surface of the lower ladder 10 by a connector 85, and the other end is connected to a bracket 82 fixed to the side surface of the second upper ladder 71. Connect by means of tool 86. With such an interlocking mechanism, the second upper ladder 71 expands and contracts by a double movement amount with respect to the movement amount of the first upper ladder 11.

図10、図11において、19Aは第2の上梯子71が第1の上梯子11に対して伸長する範囲を規制するために第1の上梯子11の側面に設けた伸長ストッパであり、32Aは第2の上梯子71の側面に設けられ、伸長時に伸長ストッパ19Aに当接させる係止板である。   10 and 11, reference numeral 19A denotes an extension stopper provided on the side surface of the first upper ladder 11 in order to restrict the range in which the second upper ladder 71 extends relative to the first upper ladder 11. Is a locking plate provided on the side surface of the second upper ladder 71 and brought into contact with the extension stopper 19A when extended.

図11、図12において、29は第2の上梯子71の第1の上梯子11に対する収縮側の限界位置を規制するために、第1の上梯子11の縦枠11aの内側の面に固着して設けた係止板であり、17Aは第2の上梯子71の縦枠71aの内側の固着して設けたブラケット87に設けられ、収縮時に係止板29に当接させる収縮側ストッパである。   11 and 12, 29 is fixed to the inner surface of the vertical frame 11 a of the first upper ladder 11 in order to restrict the limit position of the second upper ladder 71 on the contraction side with respect to the first upper ladder 11. 17A is a contraction-side stopper that is provided on a bracket 87 that is fixedly provided inside the vertical frame 71a of the second upper ladder 71 and is brought into contact with the locking plate 29 during contraction. is there.

図10〜図12の実施の形態によれば、上梯子を2段の梯子11,71により構成したので、梯子全体の伸縮幅が大きくすることが可能となる。また、これらの梯子11,71を相対的に伸縮方向に連動させる連動機構を設けたので、梯子の伸縮を整然と安定して行なうことができる。   According to the embodiment of FIGS. 10 to 12, the upper ladder is configured by the two-stage ladders 11 and 71, so that the expansion / contraction width of the entire ladder can be increased. In addition, since the interlocking mechanism for interlocking these ladders 11 and 71 in the direction of expansion and contraction is provided, the expansion and contraction of the ladder can be performed in an orderly and stable manner.

尚、本実施の形態においては、梯子が3段となる昇降装置としたが、更に4段以上の昇降装置としてもよい。また、上記実施の形態においては、いずれもステップ9bの後端に下梯子10を配置する構成としたが、ステップ9の前端部に下梯子10を取付けてもよく、ステップの側部としてもよい。その他、本発明を実施する場合、上記実施の形態に限らず、本発明の要旨を逸脱しない範囲において、種々の変更、付加が可能である。   In this embodiment, the elevating device has three stages of ladders. However, it may be an elevating apparatus having four or more stages. In each of the above embodiments, the lower ladder 10 is arranged at the rear end of the step 9b. However, the lower ladder 10 may be attached to the front end portion of the step 9 or may be a side portion of the step. . In addition, when implementing this invention, not only the said embodiment but a various change and addition are possible in the range which does not deviate from the summary of this invention.

1:下部走行体、2:旋回装置、3:上部旋回体、6:運転室、6a:運転室のドア、8:昇降装置、9:ステップ、10:下梯子、11,71:上梯子、15,15A,16,16A:ローラ、17,17A:収縮側ストッパ、18:回動ストッパ、19,19A:伸長側ストッパ、29,32,32A:係止板、35:伸長防止金具、40:浮上防止金具、44:錘、76,77:プーリ、78,79:ワイヤ 1: Lower traveling body, 2: Turning device, 3: Upper turning body, 6: Driver's cab, 6a: Door of cab, 8: Lifting device, 9: Step, 10: Lower ladder, 11, 71: Upper ladder 15, 15A, 16, 16A: roller, 17, 17A: contraction side stopper, 18: rotation stopper, 19, 19A: extension side stopper, 29, 32, 32A: locking plate, 35: extension preventing bracket, 40: Anti-floating bracket, 44: weight, 76, 77: pulley, 78, 79: wire

Claims (5)

下部走行体上に上部旋回体を設置し、前記上部旋回体に運転室を設けた作業機械の昇降装置において、
前記運転室の側方に設けたステップと、
前記ステップの端部に左右に向けて設けた横軸に中間部が枢着され、前記ステップ上に重ねた水平姿勢と起立姿勢とがとり得るように取付けた下梯子と、
前記下梯子の上に下梯子に沿って移動可能に組み合わされた上梯子と、
前記下梯子と前記上梯子の間に設けられ、前記上梯子が前記下梯子に沿って移動する範囲を規制する移動範囲規制機構と、
前記ステップに設けられ、前記下梯子を起立させた状態で下梯子の下部を当接させて起立方向へのさらなる回動を防止するための回動ストッパと、
前記ステップと前記下梯子の間に設けられ、下梯子が水平姿勢の際に、下梯子の浮き上がりを防止する浮上防止機構と、
前記下梯子と前記上梯子の間に設けられ、前記上梯子が前記下梯子に対して収縮して組み合わされている際に、前記上梯子の伸長方向への移動を防止する伸長防止機構とを備えたことを特徴とする作業機の昇降装置。
In an elevating device for a work machine in which an upper swing body is installed on a lower traveling body, and a cab is provided in the upper swing body,
A step provided on the side of the cab;
A lower ladder that is pivotally attached to a horizontal axis that is provided at the end of the step toward the left and right, and is attached so that a horizontal posture and a standing posture can be taken on the step;
An upper ladder combined on the lower ladder so as to be movable along the lower ladder;
A movement range regulating mechanism provided between the lower ladder and the upper ladder, and regulating a range in which the upper ladder moves along the lower ladder;
A rotation stopper provided in the step for preventing further rotation in the standing direction by contacting the lower portion of the lower ladder in a state where the lower ladder is raised;
A levitating prevention mechanism provided between the step and the lower ladder to prevent the lower ladder from lifting when the lower ladder is in a horizontal posture;
An extension preventing mechanism that is provided between the lower ladder and the upper ladder and prevents the upper ladder from moving in the extension direction when the upper ladder is contracted and combined with the lower ladder; A lifting device for a working machine, comprising:
請求項1に記載の作業機の昇降装置において、
前記上梯子を互いに移動可能に重ねて組み合わされた複数段の上梯子により構成すると共に、複数段の上梯子を連動して相対的に伸縮させる連動機構を備えたことを特徴とする作業機の昇降装置。
The lifting device for a working machine according to claim 1,
A working machine comprising a plurality of upper ladders that are combined to be movable and overlapped with each other, and an interlocking mechanism that interlocks and relatively expands and contracts the upper ladders. lift device.
請求項1または請求項2に記載の作業機の昇降装置において、
前記下梯子が起立した状態における前記下梯子の上部位置に、前記横軸を回動の支点とする際の支点の両側の重量バランスをとる錘を設けたことを特徴とする作業機の昇降装置。
In the raising / lowering device of the working machine of Claim 1 or Claim 2,
A lifting / lowering device for a working machine, characterized in that a weight is provided at the upper position of the lower ladder in a state where the lower ladder stands upright to balance the weights on both sides of the fulcrum when the horizontal axis is a fulcrum of rotation. .
請求項1から請求項3までのいずれか1項に記載の作業機の昇降装置において、
前記下梯子に前記上梯子を重ねて前記ステップ上に水平に格納した状態における梯子全体の高さを、運転室ドアの下辺の高さより低く設定したことを特徴とする作業機の昇降装置。
In the raising / lowering apparatus of the working machine of any one of Claim 1- Claim 3,
A lifting / lowering device for a working machine, wherein a height of the entire ladder in a state where the upper ladder is overlapped with the lower ladder and horizontally stored on the step is set lower than a height of a lower side of a cab door.
請求項1から請求項4までのいずれか1項に記載の運転室への昇降装置において、
前記ステップと前記下梯子の間に設けられ、前記下梯子が起立姿勢の際に、下梯子が水平姿勢側に回動することを防止する回動防止機構を備えたことを特徴とする作業機の昇降装置。
In the raising / lowering device to the cab of any one of Claim 1- Claim 4,
A working machine comprising a rotation prevention mechanism provided between the step and the lower ladder and preventing the lower ladder from rotating to the horizontal posture side when the lower ladder is in a standing posture. Lifting device.
JP2013095502A 2013-04-30 2013-04-30 Lifting device for work equipment Active JP5937541B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013095502A JP5937541B2 (en) 2013-04-30 2013-04-30 Lifting device for work equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013095502A JP5937541B2 (en) 2013-04-30 2013-04-30 Lifting device for work equipment

Publications (3)

Publication Number Publication Date
JP2014214579A true JP2014214579A (en) 2014-11-17
JP2014214579A5 JP2014214579A5 (en) 2015-03-19
JP5937541B2 JP5937541B2 (en) 2016-06-22

Family

ID=51940610

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013095502A Active JP5937541B2 (en) 2013-04-30 2013-04-30 Lifting device for work equipment

Country Status (1)

Country Link
JP (1) JP5937541B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11834908B2 (en) * 2019-09-12 2023-12-05 Werner Co. Interlocking ladders and components thereof
US12030460B2 (en) 2019-07-05 2024-07-09 Jaguar Land Rover Limited Ladder assembly for a vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667296A (en) * 1950-02-18 1954-01-26 J H Holan Corp Aerial ladder
JPH06137052A (en) * 1991-01-14 1994-05-17 Kazuchika Sakamoto Ladder exclusively used for roof of automobile
JPH09278365A (en) * 1996-04-17 1997-10-28 Hitachi Constr Mach Co Ltd Ladder device for construction machine
JP2003019923A (en) * 2001-05-01 2003-01-21 Hitachi Constr Mach Co Ltd Construction machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667296A (en) * 1950-02-18 1954-01-26 J H Holan Corp Aerial ladder
JPH06137052A (en) * 1991-01-14 1994-05-17 Kazuchika Sakamoto Ladder exclusively used for roof of automobile
JPH09278365A (en) * 1996-04-17 1997-10-28 Hitachi Constr Mach Co Ltd Ladder device for construction machine
JP2003019923A (en) * 2001-05-01 2003-01-21 Hitachi Constr Mach Co Ltd Construction machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12030460B2 (en) 2019-07-05 2024-07-09 Jaguar Land Rover Limited Ladder assembly for a vehicle
US11834908B2 (en) * 2019-09-12 2023-12-05 Werner Co. Interlocking ladders and components thereof

Also Published As

Publication number Publication date
JP5937541B2 (en) 2016-06-22

Similar Documents

Publication Publication Date Title
JP5728154B2 (en) Step equipment for construction machinery and forestry machinery with leveling system
JP4967080B2 (en) Ladder equipment for construction machinery
EP3025911B1 (en) Rising/falling step of industrial vehicle
CN110382783B (en) Lifting device for engineering machinery
JPWO2017002160A1 (en) Access system and work vehicle
JP2006193240A (en) Table moving device
WO2020031842A1 (en) Crane
JP5527769B2 (en) Counterweight attaching / detaching device and work machine
JP5937541B2 (en) Lifting device for work equipment
JP7221528B2 (en) Vehicle lift device
JP6151606B2 (en) Counterweight position adjustment mechanism
US9206687B2 (en) Mining roof support system
KR20200026335A (en) Loader lift assembly work apparatus
JP3156061U (en) Adjustable lifting platform
JP6840825B2 (en) crane
JP5699982B2 (en) Work machine
JP6632591B2 (en) crane
JP2021155170A (en) Boom type work vehicle
KR100887559B1 (en) Excavator with Lifting Device for Operating Room
JP7351682B2 (en) Outrigger bottom plate installation device and outrigger equipped with the same
JP4825356B2 (en) Boom type high-altitude work device work platform lifting device
JP5819673B2 (en) Elevating device for vehicle with automatic folding device for platform
JP4129461B2 (en) Altitude work equipment
JP4772191B2 (en) Work equipment
KR200366086Y1 (en) Excavator with Lifting Device for Operating Room

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150127

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150127

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20151211

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160105

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160223

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20160510

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20160512

R150 Certificate of patent or registration of utility model

Ref document number: 5937541

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150