JPS5795102A - Pantograph forcing up device - Google Patents

Pantograph forcing up device

Info

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
Application number
JP17034280A
Other languages
Japanese (ja)
Inventor
Kunio Shibayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji Electric Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP17034280A priority Critical patent/JPS5795102A/en
Publication of JPS5795102A publication Critical patent/JPS5795102A/en
Pending legal-status Critical Current

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
JP17034280A 1980-12-03 1980-12-03 Pantograph forcing up device Pending JPS5795102A (en)

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)

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