JPS5670105A - Oil jack - Google Patents
Oil jackInfo
- Publication number
- JPS5670105A JPS5670105A JP14671479A JP14671479A JPS5670105A JP S5670105 A JPS5670105 A JP S5670105A JP 14671479 A JP14671479 A JP 14671479A JP 14671479 A JP14671479 A JP 14671479A JP S5670105 A JPS5670105 A JP S5670105A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- chamber
- valve
- pressure
- jack
- 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 prevent the occurrence of cavitation, by a method wherein, when an oil jack returns after a driving stand of, for example, a cabover type vehicle inclines, one of sweeping chambers of a cylinder becomes a negative pressure resulting from a rapid fall due to a tare.
CONSTITUTION: When a driving stand 8 is tilted forward by means of an oil jack 1 from a normal position, a switch valve 14 is set in a position 14A, and a manual pump 15 is actuated. A discharge pressure oil of a pump 15 pushes and opens a pilot check valve 13b, and is fed to a sweeping chamber 11b. A valve 13c is released with an oil pressure in a line 11g, and the oil pressure is fed to a sweeping chamber 11b as well. A piston 12 moves to the left with a difference in a pressure acting area, and the jack 1 expands. In the meantime, when the driving stand 8 is lowered from a tilting condition, the switch valve 14 is set in a position B. A return oil from the chamber 11c is throttled with a throttle resistance thereupon, and the valve 13c is opened. This prevents the chamber 11b from becoming a negative pressure.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14671479A JPS5670105A (en) | 1979-11-13 | 1979-11-13 | Oil jack |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14671479A JPS5670105A (en) | 1979-11-13 | 1979-11-13 | Oil jack |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5670105A true JPS5670105A (en) | 1981-06-11 |
Family
ID=15413872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14671479A Pending JPS5670105A (en) | 1979-11-13 | 1979-11-13 | Oil jack |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5670105A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5910502U (en) * | 1982-07-13 | 1984-01-23 | 東洋油圧機械株式会社 | Double check valve for lift cylinder control |
EP0735275A2 (en) * | 1995-03-29 | 1996-10-02 | FLUTEC Fluidtechnische Geräte GmbH | Snap-in locking device |
JP2007309378A (en) * | 2006-05-17 | 2007-11-29 | Sanwa Seiki Co Ltd | Cab tilting device |
-
1979
- 1979-11-13 JP JP14671479A patent/JPS5670105A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5910502U (en) * | 1982-07-13 | 1984-01-23 | 東洋油圧機械株式会社 | Double check valve for lift cylinder control |
EP0735275A2 (en) * | 1995-03-29 | 1996-10-02 | FLUTEC Fluidtechnische Geräte GmbH | Snap-in locking device |
EP0735275A3 (en) * | 1995-03-29 | 1998-04-22 | FLUTEC Fluidtechnische Geräte GmbH | Snap-in locking device |
JP2007309378A (en) * | 2006-05-17 | 2007-11-29 | Sanwa Seiki Co Ltd | Cab tilting device |
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