JPS60114183U - Multi-stage telescopic boom extension device - Google Patents
Multi-stage telescopic boom extension deviceInfo
- Publication number
- JPS60114183U JPS60114183U JP209684U JP209684U JPS60114183U JP S60114183 U JPS60114183 U JP S60114183U JP 209684 U JP209684 U JP 209684U JP 209684 U JP209684 U JP 209684U JP S60114183 U JPS60114183 U JP S60114183U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- hydraulic cylinder
- switching valve
- cylinder
- stage telescopic
- 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.)
- Pending
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案による他断伸縮ブームに適用した例を示
した縦断面図、第２図は第１油圧シリンダと第２油圧シ
リンダを結ぶ油圧回路図、第３図は第１および第２切換
弁の切換機構を示した説明図、第４図は第１油圧シリン
ダが最伸長状態にある状態を示した説明図である。
１、 ２． ３・・・ブーム、４・・・第１油圧シリン
ダ、 ７・・・第２油圧シリンダ、２７．２８・・・
連絡油路、３１・・・第１切換弁、３−２・・・第２切
換弁、３３・・・検−出アーム、３４・・・検知板。Fig. 1 is a vertical cross-sectional view showing an example applied to the transverse telescopic boom according to the present invention, Fig. 2 is a hydraulic circuit diagram connecting the first hydraulic cylinder and the second hydraulic cylinder, and Fig. 3 is the hydraulic circuit diagram connecting the first and second hydraulic cylinders. FIG. 4 is an explanatory diagram showing the switching mechanism of the switching valve, and FIG. 4 is an explanatory diagram showing a state in which the first hydraulic cylinder is in the most extended state. 1, 2. 3...Boom, 4...First hydraulic cylinder, 7...Second hydraulic cylinder, 27.28...
Communication oil passage, 31...first switching valve, 3-2...second switching valve, 33...detection arm, 34...detection plate.
Claims (1)
側に第３ブームをそれぞれ入れ千秋に組み込み、第１ブ
ームと第２ブームとの間を第１油圧シリンダで伸縮駆動
する一方、第２ブームと第３ブームとの間を第２油圧シ
リンダで伸縮駆動するようにした多段伸縮ブームにおい
て、第１油圧シリンダと第２油圧シリンダの伸長側どリ
ンダ室どうしを第１の連絡油路で結び、この管路上に第
１切換弁を組込み、第１油圧シリンダと第２油圧シリン
ダの縮小側シリンダ室どうじを第２連絡油路で結び、こ
の管路上に第２切換弁を組込み、第１油圧シリンダの最
伸長時で第１．切換弁を開き、第１油圧シリンダの最縮
小時で第２切換弁を開くようにしたことを特徴とする多
段伸縮ブームの伸縮装置。 −・２ 上記第１および第
２切換弁が逆止弁付きの油圧切換弁であることを特徴と
する実用新案登録請求の範囲第１項記載の多段伸縮ブー
ムの伸縮装置。 ３ 第１油圧シリンダの最伸長状態は、第２ブームの後
端に設けられた検出アームと第１ブームの内側に固定さ
れた検知板とによって検出する、ようにしたことを特徴
とする実用新案登録請求の範囲第１項記載の多段伸縮ブ
ームの伸縮装置。[Claims for Utility Model Registration] 1. A second boom is placed inside the first boom, and a third boom is placed inside the second boom. In a multi-stage telescopic boom in which a cylinder is used to extend and retract the cylinder, and a second hydraulic cylinder is used to extend and retract between the second and third booms, the cylinder chambers on the extension sides of the first and second hydraulic cylinders are connected to each other. are connected by a first communication oil passage, a first switching valve is installed on this pipeline, the contraction side cylinder chambers of the first hydraulic cylinder and the second hydraulic cylinder are connected by a second communication oil passage, and a first switching valve is installed on this pipeline. A two-way switching valve is incorporated, and when the first hydraulic cylinder is fully extended, the first. A telescoping device for a multi-stage telescopic boom, characterized in that a switching valve is opened and a second switching valve is opened when the first hydraulic cylinder is at its maximum contraction. -.2 The telescoping device for a multi-stage telescopic boom according to claim 1, wherein the first and second switching valves are hydraulic switching valves with check valves. 3. A utility model characterized in that the maximum extension state of the first hydraulic cylinder is detected by a detection arm provided at the rear end of the second boom and a detection plate fixed to the inside of the first boom. A telescoping device for a multistage telescoping boom as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP209684U JPS60114183U (en) | 1984-01-11 | 1984-01-11 | Multi-stage telescopic boom extension device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP209684U JPS60114183U (en) | 1984-01-11 | 1984-01-11 | Multi-stage telescopic boom extension device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60114183U true JPS60114183U (en) | 1985-08-02 |
Family
ID=30475450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP209684U Pending JPS60114183U (en) | 1984-01-11 | 1984-01-11 | Multi-stage telescopic boom extension device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60114183U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5856786B2 (en) * | 1980-07-08 | 1983-12-16 | 環境開発鋼販株式会社 | Wild edge mounting bracket |
-
1984
- 1984-01-11 JP JP209684U patent/JPS60114183U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5856786B2 (en) * | 1980-07-08 | 1983-12-16 | 環境開発鋼販株式会社 | Wild edge mounting bracket |
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