JPS5578809A - Three-stage cylinder device - Google Patents
Three-stage cylinder deviceInfo
- Publication number
- JPS5578809A JPS5578809A JP15006778A JP15006778A JPS5578809A JP S5578809 A JPS5578809 A JP S5578809A JP 15006778 A JP15006778 A JP 15006778A JP 15006778 A JP15006778 A JP 15006778A JP S5578809 A JPS5578809 A JP S5578809A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- cylinder
- check valve
- pressurized oil
- piston rod
- 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
PURPOSE: To both simplify a construction and eliminate an oil leak when operated, by providing a check valve in a feed-discharge circuit to the extension side room of cylinder, and constituting the sequentially operating mechanism all with a valve of puppet type.
CONSTITUTION: In a feed-discharge circuit to an extension side room 16, 20 of the first and second cylinder, is provided a check valve 45, 27, and a valve 24, 38, that opens at the time of longest extension and shortest contraction of the cylinder respectively, is constituted by a puppet valve. With a pressurized oil fed to a line 4, the pressurized oil opens the check valve 45 to enter the room 16, and extends a piston rod C. At the time or longest extension of the piston rod C, the valve 24 is opened, and the pressurized oil opens the check valve 27 to enther the room 20, and extends a cylinder A. With a pressurized oil fed to a line 5, the cylinder A and the piston rod C are successively contracted. In such way, by providing the check valve and puppet valve, the construction comes to be simplified, as well as with an oil leak eliminated when in operation.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15006778A JPS5578809A (en) | 1978-12-06 | 1978-12-06 | Three-stage cylinder device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15006778A JPS5578809A (en) | 1978-12-06 | 1978-12-06 | Three-stage cylinder device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5578809A true JPS5578809A (en) | 1980-06-13 |
Family
ID=15488785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15006778A Pending JPS5578809A (en) | 1978-12-06 | 1978-12-06 | Three-stage cylinder device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5578809A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5794106A (en) * | 1980-12-02 | 1982-06-11 | Yunitsuku:Kk | Cylinder extension apparatus |
| JPS57127108A (en) * | 1980-12-02 | 1982-08-07 | Yunitsuku:Kk | Three-staged cylinder device |
| JPS60252589A (en) * | 1984-05-25 | 1985-12-13 | 古河機械金属株式会社 | Multistage expanding boom |
| DE3823225A1 (en) * | 1988-07-08 | 1990-01-11 | Montan Hydraulik Gmbh & Co Kg | Multi-stage hydraulic telescopic cylinder with positive control for the extension and retraction sequence of the telescopic members |
| WO2019193259A1 (en) * | 2018-04-06 | 2019-10-10 | Tmk Energiakoura Oy | Hydraulic actuator, working device, and energy-wood grapple |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362077A (en) * | 1976-11-17 | 1978-06-03 | Unic Corp | Triple stage cylinder device |
-
1978
- 1978-12-06 JP JP15006778A patent/JPS5578809A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362077A (en) * | 1976-11-17 | 1978-06-03 | Unic Corp | Triple stage cylinder device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5794106A (en) * | 1980-12-02 | 1982-06-11 | Yunitsuku:Kk | Cylinder extension apparatus |
| JPS57127108A (en) * | 1980-12-02 | 1982-08-07 | Yunitsuku:Kk | Three-staged cylinder device |
| JPS60252589A (en) * | 1984-05-25 | 1985-12-13 | 古河機械金属株式会社 | Multistage expanding boom |
| DE3823225A1 (en) * | 1988-07-08 | 1990-01-11 | Montan Hydraulik Gmbh & Co Kg | Multi-stage hydraulic telescopic cylinder with positive control for the extension and retraction sequence of the telescopic members |
| WO2019193259A1 (en) * | 2018-04-06 | 2019-10-10 | Tmk Energiakoura Oy | Hydraulic actuator, working device, and energy-wood grapple |
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