JPS5935515Y2 - Work platform balance maintenance device for aerial work vehicles - Google Patents
Work platform balance maintenance device for aerial work vehiclesInfo
- Publication number
- JPS5935515Y2 JPS5935515Y2 JP1980039036U JP3903680U JPS5935515Y2 JP S5935515 Y2 JPS5935515 Y2 JP S5935515Y2 JP 1980039036 U JP1980039036 U JP 1980039036U JP 3903680 U JP3903680 U JP 3903680U JP S5935515 Y2 JPS5935515 Y2 JP S5935515Y2
- Authority
- JP
- Japan
- Prior art keywords
- work platform
- work
- balance
- boom
- balance maintaining
- 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.)
- Expired
Links
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Description
【考案の詳細な説明】
この考案は、高所作業車の作業台の底面を常に水平位置
に保持する作業台平衡保持装置に関する。[Detailed Description of the Invention] This invention relates to a work platform balance maintaining device that always maintains the bottom surface of the work platform of an aerial work vehicle in a horizontal position.
従来の高所作業車の作業台平衡保持装置は、平行リンク
機構あるいはブームの基部から作業台へ掛渡すワイヤー
、チェーン等により作業台の平衡保持を行っていた。Conventional work platform balance maintaining devices for aerial work vehicles maintain the balance of the work platform using a parallel link mechanism or a wire, chain, or the like that extends from the base of the boom to the work platform.
従って、ワイヤー、チェーン等に破損が起ると作業台が
転覆する危険があり、また車体を基準にして作業台の平
衡保持を行う構成である為車体が傾斜している上作業台
も傾斜してしまうという問題点があった。Therefore, if the wires, chains, etc. are damaged, there is a risk of the work platform overturning.Also, since the work platform is configured to maintain balance based on the vehicle body, the vehicle body is tilted, and the work platform is also tilted. There was a problem with this.
この考案は、このような従来の問題点に着目してなされ
たもので、作業台に設けられた垂直感知機構と、この垂
直感知機構により制御される平衡保持機構と、を備えた
作業台平衡保持装置において、操作部がブームの仰角を
変化させるよう操作された時のみこの操作に連動して制
御手段が平衡保持機構を作動させることにより、上述の
問題点を解決するとともに、作業台の暴走を防止するこ
とを目的としている。This invention was made by paying attention to such conventional problems, and is a workbench balance system that is equipped with a vertical sensing mechanism provided on the workbench and a balance maintenance mechanism controlled by this vertical sensing mechanism. In the holding device, only when the operating section is operated to change the elevation angle of the boom, the control means operates the balance maintaining mechanism in conjunction with this operation, thereby solving the above-mentioned problems and preventing the work platform from running out of control. The purpose is to prevent
以下、この考案を図面を参照して説明する。This invention will be explained below with reference to the drawings.
第１図は、この考案による作業台平衡保持装置を備える
高所作業車を示し、車体１に載置された旋回台２に下部
ブーム３がピン軸４により枢着され、この下部ブーム３
が旋回台２との間に取付けた起伏シリンダ５により起伏
自在とされ、また下部ブーム３の先端に上部ブーム６が
ピン軸７により枢着されこの上部ブーム６が下部ブーム
３との間に取付けた屈伸シリンダ８及び開脚リンク９に
より屈伸自在とされ、さらに上部ブーム６の先端に作業
台１０がピン軸１１により枢着されこの作業台１０が上
部ブーム６との間に取付けた平衡保持シリンダ１２によ
り平衡保持される構成である。FIG. 1 shows an aerial work vehicle equipped with a work platform balance maintaining device according to this invention.
can be raised and lowered freely by a luffing cylinder 5 installed between it and the swivel base 2, and an upper boom 6 is pivotally connected to the tip of the lower boom 3 by a pin shaft 7, and this upper boom 6 is installed between it and the lower boom 3. A workbench 10 is pivotally attached to the tip of the upper boom 6 by a pin shaft 11, and a balance maintaining cylinder is installed between the workbench 10 and the upper boom 6. This is a configuration in which equilibrium is maintained by 12.
第２図に示すように、作業台１０には、重錘１３が作業
台１０を上部ブーム６に枢着しているピン軸１１と平行
なピン軸１４により揺動自在に枢着され、またこの重錘
１３に対しリンク１５を介して弁操作部１６ ａが連結
された制御切換弁１６が設けられ、さらに重錘１３には
この重錘１３の揺動を緩衝するダンパ１７が付設され、
また制御切換弁１６は管路１Ｂ、 １９により平衡保持
シリンダ１２と接続されていると共に管路２０．２１に
より第３図に示すような油圧回路の油圧ポンプ２２及び
タンク２３に接続されている。As shown in FIG. 2, a weight 13 is pivotally attached to the workbench 10 by a pin shaft 14 that is parallel to the pinshaft 11 that pivotally connects the workbench 10 to the upper boom 6. The weight 13 is provided with a control switching valve 16 connected to a valve operating portion 16a via a link 15, and the weight 13 is further provided with a damper 17 for damping the swinging of the weight 13.
The control switching valve 16 is also connected to the balance cylinder 12 by lines 1B and 19, and is also connected to a hydraulic pump 22 and a tank 23 of a hydraulic circuit as shown in FIG. 3 by lines 20 and 21.
ここで、前述した重錘１３．ピン軸１４およびリンク１
５は全体として作業台１０に設けられた垂直感知機構Ａ
を構成し、制御切換弁１６および平衡保持シリンダ１２
は全体として作業台１０と上部ブーム６との間に設けら
れて垂直感知機構Ａにより制御され作業台１０を常時水
平に保持する平衡保持機構Ｂを構成する。Here, the aforementioned weight 13. Pin shaft 14 and link 1
5 is a vertical sensing mechanism A provided on the workbench 10 as a whole.
, the control switching valve 16 and the balance maintaining cylinder 12
as a whole constitutes an equilibrium holding mechanism B that is provided between the workbench 10 and the upper boom 6 and is controlled by the vertical sensing mechanism A to keep the workbench 10 horizontal at all times.
この油圧ポンプ２２は、制御切換弁２４を介して旋回台
２を往復回転させる旋回用油圧モータ２５に接続され、
並びに制御切換弁２６を介して起伏シリンダ５と接続さ
れ、並びに制御切換弁２７を介して屈伸シリンダ８に接
続されている。This hydraulic pump 22 is connected via a control switching valve 24 to a swing hydraulic motor 25 that rotates the swing base 2 in a reciprocating manner.
It is also connected to the undulating cylinder 5 via a control switching valve 26, and to the bending cylinder 8 via a control switching valve 27.
ここで、起伏シリンダ５、制御切換弁２６、屈伸シリン
ダ８．制御切換弁２７．旋回用油圧モータ２５、制御切
換弁２４は全体として前記上部、下部ブーム６．３の仰
角を変化させたり、旋回台２を旋回させる操作部Ｃを構
成する。Here, the undulating cylinder 5, the control switching valve 26, the bending cylinder 8. Control switching valve 27. The swing hydraulic motor 25 and the control switching valve 24 collectively constitute an operating section C that changes the elevation angles of the upper and lower booms 6.3 and turns the swing base 2.
油圧ポンプ２２と制御切換弁１６とを接続する管路２０
．２１には常時はばねにより閉じており起伏シリンダ５
または屈伸シリンダ８の少くとも一方が作動状態の時そ
の圧力をパイロット管路２８を通じ入力して開くシャッ
トオフ弁２９が設けられている。Pipe line 20 connecting hydraulic pump 22 and control switching valve 16
．． 21 is a undulation cylinder 5 which is normally closed by a spring.
Alternatively, a shutoff valve 29 is provided which is opened by inputting the pressure through the pilot pipe 28 when at least one of the bending and extending cylinders 8 is in an operating state.
すなわち、シャットオフ弁２９は前記操作部Ｃの操作に
連動して前記平衡保持機構Ｂを制御する制御手段りを構
成する。That is, the shutoff valve 29 constitutes a control means for controlling the balance maintaining mechanism B in conjunction with the operation of the operating section C.
なお符号３０はリリーフ弁である。次に、作用について
説明する。Note that the reference numeral 30 is a relief valve. Next, the effect will be explained.
まず、操作部Ｃを操作し、上部、下部ブーム６゜３の仰
角を変化させる場合について説明する。First, a case will be described in which the operating portion C is operated to change the elevation angle of the upper and lower booms 6°3.
すなわち、ハンドル操作により制御切換弁２６をａ位置
に切換えて起伏シリンダ５を伸長し、°または、ハンド
ル操作により制御切換弁２７をＣ位置に切換えて屈伸シ
リンダ８を縮小することにより、上部ブーム６を第２図
において矢印Ｘで示す方向に揺動させる。That is, by operating the handle, the control switching valve 26 is switched to position A to extend the luffing cylinder 5; or, by operating the handle, switching the control switching valve 27 to position C and contracting the bending cylinder 8; is swung in the direction shown by arrow X in FIG.
このとき、制御切換弁２４はｂ位置に切換えられている
。At this time, the control switching valve 24 has been switched to the b position.
この結果、油圧ポンプ２２からの圧油はパイロット管路
２８を介してシャットオフ弁２９に作用し、このシャッ
トオフ弁２９を“開”位置に切換える。As a result, pressure oil from the hydraulic pump 22 acts on the shutoff valve 29 via the pilot line 28, switching the shutoff valve 29 to the "open" position.
したがって、制御手段りが平衡保持機構Ｂを作動させる
ことになる。Therefore, the control means operates the balance maintaining mechanism B.
すなわち、作業台１０が前述した上部ブーム６の揺動に
より傾斜しようとしても垂直感知機構Ａの重錘１３は常
に鉛直方向を指示するため、制御切換弁１６はリンク１
５および弁操作部１６ａを介して重錘１３により引張ら
れてａ位置に切換わる。That is, even if the work platform 10 tries to tilt due to the above-described rocking of the upper boom 6, the weight 13 of the vertical sensing mechanism A always indicates the vertical direction, so the control switching valve 16
5 and the valve operating portion 16a, it is pulled by the weight 13 and switched to the a position.
この結果、平衡保持シリンダ１２は突出し、作業台１０
を水平位置にもどす。As a result, the balance cylinder 12 protrudes and the workbench 10
Return to horizontal position.
したがって、平衡保持機構Ｂは垂直感知機構Ａに制御さ
れて作業台１０を水平に保持することになる。Therefore, the balance holding mechanism B is controlled by the vertical sensing mechanism A to hold the workbench 10 horizontally.
また、操作部Ｃの操作により上部ブーム６を第２図にお
いて矢印Ｙで示す方向に揺動させる場合も、前述と同様
に垂直感知機構Ａに制御されて平衡保持機構Ｂは作業台
１０を水平に保持する。Also, when the upper boom 6 is swung in the direction shown by the arrow Y in FIG. to hold.
次に、操作部Ｃを操作し、旋回台２を旋回させる場合に
ついて説明する。Next, a case will be described in which the operating portion C is operated to rotate the swivel base 2.
すなわち、ハンドル操作により制御切換弁２４をａまた
はＣ位置に切換える。That is, the control switching valve 24 is switched to the a or C position by operating the handle.
この結果、旋回用油圧モータ２５は作動し、旋回台２は
旋回するが、上部、下部ブーム６．３は揺動しないので
作業台１０は傾斜しない。As a result, the swing hydraulic motor 25 is activated and the swivel table 2 turns, but the upper and lower booms 6.3 do not swing, so the work table 10 does not tilt.
このとき、制御切換弁２６．２７には圧油は供給されず
、また、シャットオフ弁２９にも圧油が供給されない。At this time, no pressure oil is supplied to the control switching valves 26 and 27, and no pressure oil is supplied to the shutoff valve 29 either.
したがって、シャットオフ弁２９はばねにより閉止され
ており、平衡保持機構Ｂは作動しない。Therefore, the shutoff valve 29 is closed by the spring, and the balance maintenance mechanism B does not operate.
次に、操作部Ｃに故障が生じた場合について説明する。Next, a case where a failure occurs in the operating section C will be described.
この場合は、制御切換弁２６．２７をいずれもｂ位置に
切換える。In this case, both control switching valves 26 and 27 are switched to position b.
この結果、起伏シリンダ５および屈伸シリンダ８は固定
され、上部ブーム６は揺動しない。As a result, the hoisting cylinder 5 and the bending cylinder 8 are fixed, and the upper boom 6 does not swing.
このとき、シャットオフ弁２９はばねにより“閉”位置
に操作されており、平衡保持機構Ｂは作動しない。At this time, the shutoff valve 29 is operated to the "closed" position by the spring, and the balance maintenance mechanism B does not operate.
したがって、作業台１０は暴走せず常に水平に保持され
ることになる。Therefore, the workbench 10 will not run out of control and will always be held horizontally.
以上説明してきたように、この考案によれば、作業台平
衡保持装置に垂直感知機構と、平衡保持機構と、制御手
段と、を設け、操作部によりブームの仰角を変化させる
よう操作した時のみ制御手段が平衡保持機構を作動させ
るようにしたため、ワイヤー、チェーン等を使用しない
でその破損により作業台が転覆するという危険が廻避さ
れ、また車体の傾斜にかかわらず作業台が真の平衡位置
に保持され、さらに作業台平衡保持装置を駆動する油圧
回路の故障時も平衡保持シリンダによる平衡保持機能を
補償できるという効果を有する。As explained above, according to this invention, the work platform balance maintaining device is provided with a vertical sensing mechanism, a balance maintaining mechanism, and a control means, and only when the operating section is operated to change the elevation angle of the boom. Since the control means operates the balance maintenance mechanism, the danger of the work platform being overturned due to breakage without using wires, chains, etc. is avoided, and the work platform is maintained in a true equilibrium position regardless of the tilt of the vehicle body. Furthermore, even in the event of a failure of the hydraulic circuit that drives the workbench balance maintaining device, the balance maintaining function of the balance maintaining cylinder can be compensated.
図面はこの考案の一実施例を示し、第１図は屈伸型高所
作業車の側面図、第２図は構成要部の概略図、第３図は
油圧回路図である。
６・・・・・・上部ブーム、１０・・・・・・作業台、
Ａ・・・・・・垂直感知機構、Ｂ・・・・・・平衡保持
機構、Ｃ・・・・・・操作部、Ｄ・・・・・・制御手段
。The drawings show one embodiment of this invention, and FIG. 1 is a side view of a bendable and extendable aerial work vehicle, FIG. 2 is a schematic diagram of the main components, and FIG. 3 is a hydraulic circuit diagram. 6...Upper boom, 10...Work platform,
A: Vertical sensing mechanism, B: Balance holding mechanism, C: Operating section, D: Control means.
Claims (1)
れた垂直感知機構と、作業台とブームとの間に設けられ
て前記垂直感知機構に制御され作業台を水平に保持する
平衡保持機構と、を備えた高所作業車の作業台平衡保持
装置において、前記ブームの仰角を変化させる操作部の
操作に連動して前記平衡保持機構を制御する制御手段を
設け、前記操作部のブームの仰角を変化させる操作時以
外は前記制御手段が平衡保持機構を作動させないように
したことを特徴とする高所作業車の作業台平衡保持装置
。A work platform pivotally supported at the tip of the boom, a vertical sensing mechanism provided on the work platform, and an equilibrium maintenance device installed between the work platform and the boom to maintain the work platform horizontally under the control of the vertical sensing mechanism. A work platform balance maintaining device for an aerial work vehicle, comprising: a control means for controlling the balance maintaining mechanism in conjunction with an operation of an operating section that changes the elevation angle of the boom; A work platform balance maintaining device for an aerial work vehicle, characterized in that the control means does not operate the balance maintaining mechanism except when operating to change the elevation angle of the work platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980039036U JPS5935515Y2 (en) | 1980-03-24 | 1980-03-24 | Work platform balance maintenance device for aerial work vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980039036U JPS5935515Y2 (en) | 1980-03-24 | 1980-03-24 | Work platform balance maintenance device for aerial work vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56140600U JPS56140600U (en) | 1981-10-23 |
| JPS5935515Y2 true JPS5935515Y2 (en) | 1984-10-01 |
Family
ID=29634515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980039036U Expired JPS5935515Y2 (en) | 1980-03-24 | 1980-03-24 | Work platform balance maintenance device for aerial work vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5935515Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59158799A (en) * | 1983-02-25 | 1984-09-08 | 新明和工業株式会社 | Vertical holder for work bucket of height service car |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49121305A (en) * | 1973-03-26 | 1974-11-20 |
-
1980
- 1980-03-24 JP JP1980039036U patent/JPS5935515Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49121305A (en) * | 1973-03-26 | 1974-11-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56140600U (en) | 1981-10-23 |
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