JPS6367587U - - Google Patents
Info
- Publication number
- JPS6367587U JPS6367587U JP16205286U JP16205286U JPS6367587U JP S6367587 U JPS6367587 U JP S6367587U JP 16205286 U JP16205286 U JP 16205286U JP 16205286 U JP16205286 U JP 16205286U JP S6367587 U JPS6367587 U JP S6367587U
- Authority
- JP
- Japan
- Prior art keywords
- side pressure
- pressure oil
- oil chamber
- switching valve
- extension
- 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
- 230000008602 contraction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Jib Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の１実施例を示す説明図、第２
図は本考案のその他の実施例を示す油圧回路図で
ある。
Ａ；多段ブーム、４；第１伸縮シリンダ、７；
第２伸縮シリンダ、１１；主切替弁、１５；副切
替弁。
Figure 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is a hydraulic circuit diagram showing another embodiment of the present invention. A; Multi-stage boom, 4; First telescopic cylinder, 7;
Second telescopic cylinder, 11; main switching valve, 15; sub switching valve.
Claims (1)
在に配設してなる多段ブームの各ブーム間に、伸
長動作側圧油室と縮小動作側圧油室を具えた伸縮
シリンダーを夫々配設し、各伸縮シリンダの縮小
動作側圧油室を互に連通せしめて、その最基段位
の縮小動作側圧油室を主切替弁の一方のポートに
接続し、前記主切替弁の他方のポートに接続する
油路には、当該油路を下段側の油圧シリンダの伸
長動作側圧油室に接続する第１位置を上段側の油
圧シリンダの伸長動作側圧油室に接続する第２位
置に切替接続する副切替弁を配設し、当該副切替
弁は、前記第１位置に位置するときには前記上段
側の伸長動作側圧油室に至る油路をタンク側に接
続するようにしたことを特徴とする多段ブームの
伸縮装置。 A multi-stage boom consisting of three or more booms telescopically arranged in a telescopic manner has telescopic cylinders each having an extension side pressure oil chamber and a contraction side pressure oil chamber between each boom. The reduction operation side pressure oil chambers are made to communicate with each other, and the reduction operation side pressure oil chamber at the lowest stage is connected to one port of the main switching valve, and the oil passage connected to the other port of the main switching valve is provided. , a sub-switching valve is provided that switches and connects the first position, which connects the oil passage to the extension operation side pressure oil chamber of the lower hydraulic cylinder, to the second position, which connects the oil passage to the extension operation side pressure oil chamber of the upper hydraulic cylinder. The multi-stage boom extension and retraction device is characterized in that, when the sub-switching valve is located at the first position, the oil passage leading to the extension operation side pressure oil chamber on the upper stage side is connected to the tank side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16205286U JPS6367587U (en) | 1986-10-21 | 1986-10-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16205286U JPS6367587U (en) | 1986-10-21 | 1986-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6367587U true JPS6367587U (en) | 1988-05-07 |
Family
ID=31088943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16205286U Pending JPS6367587U (en) | 1986-10-21 | 1986-10-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6367587U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4937028U (en) * | 1972-06-13 | 1974-04-02 | ||
| JPS5225511A (en) * | 1975-08-21 | 1977-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Metal sealing type magnetic switch matrix |
| JPS5319742A (en) * | 1976-08-07 | 1978-02-23 | Matsushita Electric Ind Co Ltd | Needless signal elimination unit |
-
1986
- 1986-10-21 JP JP16205286U patent/JPS6367587U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4937028U (en) * | 1972-06-13 | 1974-04-02 | ||
| JPS5225511A (en) * | 1975-08-21 | 1977-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Metal sealing type magnetic switch matrix |
| JPS5319742A (en) * | 1976-08-07 | 1978-02-23 | Matsushita Electric Ind Co Ltd | Needless signal elimination unit |
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