JPS5795102A - Pantograph forcing up device - Google Patents
Pantograph forcing up deviceInfo
- Publication number
- JPS5795102A JPS5795102A JP17034280A JP17034280A JPS5795102A JP S5795102 A JPS5795102 A JP S5795102A JP 17034280 A JP17034280 A JP 17034280A JP 17034280 A JP17034280 A JP 17034280A JP S5795102 A JPS5795102 A JP S5795102A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- open
- cylinder
- wrong
- forcing
- 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
Landscapes
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
PURPOSE: To prevent a wrong piston traveling caused by the leakage of an open-close valve by a method wherein a hydraulic cylinder is provided around its inside circumference with a channel so arranged that it establishes communication between the chambers above and below the piston when the piston is located at its lower position and is blocked when the piston is at its higher position.
CONSTITUTION: A piston 9 is provided on its outer surface with a groove 25 running from the middle of the vertical length of the piston 9 up to its upper edge along an external peripheral surface of the piston. A cylinder 8 is provided on its inner surface with a well 26. With the piston 9 not forcing up the current collector shoe 4, the groove 25 and the well 26 constitutes a channel through which the chamber below the piston 9 in the cylinder 8 is connected with the chamber above the piston 9 communicating to a tank 17 open to atmospheric pressure. This setup prevents generation of a high oil pressure below the piston 9 even when leakage of an open-close valve is caused, thereby preventing a wrong piston traveling.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17034280A JPS5795102A (en) | 1980-12-03 | 1980-12-03 | Pantograph forcing up device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17034280A JPS5795102A (en) | 1980-12-03 | 1980-12-03 | Pantograph forcing up device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5795102A true JPS5795102A (en) | 1982-06-12 |
Family
ID=15903144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17034280A Pending JPS5795102A (en) | 1980-12-03 | 1980-12-03 | Pantograph forcing up device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5795102A (en) |
-
1980
- 1980-12-03 JP JP17034280A patent/JPS5795102A/en active Pending
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