JPH0458596U - - Google Patents
Info
- Publication number
- JPH0458596U JPH0458596U JP10151590U JP10151590U JPH0458596U JP H0458596 U JPH0458596 U JP H0458596U JP 10151590 U JP10151590 U JP 10151590U JP 10151590 U JP10151590 U JP 10151590U JP H0458596 U JPH0458596 U JP H0458596U
- Authority
- JP
- Japan
- Prior art keywords
- leveling cylinder
- hydraulic line
- side oil
- boom
- hydraulic
- 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
Links
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Description
第１図は、本考案に係るレベリング装置の構成
を示した油圧回路図、第２図は、上記レベリング
装置による第１油圧ライン内の油圧の経時変化を
示したグラフ、第３図は、上記レベリング装置を
備えた高所作業車の側面図、第４図は、従来のレ
ベリング装置による第１油圧ライン内の油圧の経
時変化を示したグラフである。
１……レベリング装置、２……下部レベリング
シリンダ、３……上部レベリングシリンダ、１１
……第１油圧ライン、１２……第２油圧ライン、
１３……ダブルパイロツトチエツクバルブ、２０
……油圧調整回路、３３……ブーム、３４……起
伏シリンダ、３５……作業台、４０……起伏制御
バルブ。
FIG. 1 is a hydraulic circuit diagram showing the configuration of a leveling device according to the present invention, FIG. 2 is a graph showing changes over time in the oil pressure in the first hydraulic line due to the leveling device, and FIG. 3 is a diagram showing the above-mentioned FIG. 4, a side view of an aerial work vehicle equipped with a leveling device, is a graph showing changes over time in the hydraulic pressure in the first hydraulic line due to the conventional leveling device. 1...Leveling device, 2...Lower leveling cylinder, 3...Upper leveling cylinder, 11
...First hydraulic line, 12...Second hydraulic line,
13...Double pilot check valve, 20
... Hydraulic adjustment circuit, 33 ... Boom, 34 ... Lifting cylinder, 35 ... Work platform, 40 ... Lifting control valve.
Claims (1)
ムの先端に上下に揺動自在に作業台を取り付けて
なる高所作業車において、前記車体および前記ブ
ーム間に取り付けられ、前記ブームの起伏作業に
伴つて伸縮する下部レベリングシリンダと、前記
ブームおよび前記作業台間に取り付けられ、前記
作業台を上下に揺動させる上部レベリングシリン
ダと、前記下部レベリングシリンダのロツド側油
室および前記上部レベリングシリンダのロツド側
油室を接続する第１油圧ラインと、前記下部レベ
リングシリンダのボトム側油室および前記上部レ
ベリングシリンダのボトム側油室を接続する第２
油圧ラインと、前記第１油圧ライン上に設けられ
、前記第２油圧ライン内の油圧が所定圧より低い
ときは前記上部レベリングシリンダのロツド側油
室からの作動油の流出を規制し、前記第２油圧ラ
イン内の油圧が前記所定圧に達したときは前記流
出を許容するパイロツトチエツクバルブとからな
り、前記ブームの起伏作動に応じて前記作業台を
水平に保持する高所作業車のレベリング装置であ
つて、 前記ブームが起伏作動を開始するときに、前記
第１油圧ラインにおける前記パイロツトチエツク
バルブおよび前記下部レベリングシリンダのロツ
ド側油室間の油圧を、前記第１油圧ラインにおけ
る前記パイロツトチエツクバルブおよび前記上部
レベリングシリンダのロツド側油室間の油圧に近
づける油圧調整手段を有してなることを特徴とす
る高所作業車のレベリング装置。[Scope of Claim for Utility Model Registration] An aerial work vehicle comprising a boom that can be freely raised and lowered on the body and a work platform attached to the tip of the boom so as to be able to swing up and down, which is attached between the body and the boom. a lower leveling cylinder that expands and contracts as the boom moves up and down; an upper leveling cylinder that is installed between the boom and the workbench and swings the workbench up and down; and a rod side oil of the lower leveling cylinder. A first hydraulic line connects the rod-side oil chamber of the upper leveling cylinder and the rod-side oil chamber of the upper leveling cylinder, and a second hydraulic line connects the bottom-side oil chamber of the lower leveling cylinder and the bottom-side oil chamber of the upper leveling cylinder.
a hydraulic line, and a hydraulic line provided on the first hydraulic line, which restricts the outflow of hydraulic oil from the rod side oil chamber of the upper leveling cylinder when the hydraulic pressure in the second hydraulic line is lower than a predetermined pressure; 2. A leveling device for an aerial work vehicle, which comprises a pilot check valve that allows the outflow when the hydraulic pressure in the hydraulic line reaches the predetermined pressure, and holds the work platform horizontally according to the raising and lowering operations of the boom. When the boom starts raising and lowering, the hydraulic pressure between the pilot check valve in the first hydraulic line and the rod-side oil chamber of the lower leveling cylinder is controlled by the pilot check valve in the first hydraulic line. and a hydraulic pressure adjusting means for adjusting the hydraulic pressure between the rod-side oil chambers of the upper leveling cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10151590U JP2510311Y2 (en) | 1990-09-27 | 1990-09-27 | Leveling equipment for aerial work vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10151590U JP2510311Y2 (en) | 1990-09-27 | 1990-09-27 | Leveling equipment for aerial work vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0458596U true JPH0458596U (en) | 1992-05-20 |
| JP2510311Y2 JP2510311Y2 (en) | 1996-09-11 |
Family
ID=31845039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10151590U Expired - Fee Related JP2510311Y2 (en) | 1990-09-27 | 1990-09-27 | Leveling equipment for aerial work vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2510311Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005132519A (en) * | 2003-10-28 | 2005-05-26 | Aichi Corp | Levelling device for high lift working vehicle |
| US9520835B2 (en) | 2012-06-14 | 2016-12-13 | Skyworks Solutions, Inc. | Power amplifier modules including bipolar transistor with grading and related systems, devices, and methods |
-
1990
- 1990-09-27 JP JP10151590U patent/JP2510311Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005132519A (en) * | 2003-10-28 | 2005-05-26 | Aichi Corp | Levelling device for high lift working vehicle |
| US9520835B2 (en) | 2012-06-14 | 2016-12-13 | Skyworks Solutions, Inc. | Power amplifier modules including bipolar transistor with grading and related systems, devices, and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2510311Y2 (en) | 1996-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |