JPS5670104A - Oil jack - Google Patents

Oil jack

Info

Publication number
JPS5670104A
JPS5670104A JP14671379A JP14671379A JPS5670104A JP S5670104 A JPS5670104 A JP S5670104A JP 14671379 A JP14671379 A JP 14671379A JP 14671379 A JP14671379 A JP 14671379A JP S5670104 A JPS5670104 A JP S5670104A
Authority
JP
Japan
Prior art keywords
oil pressure
piston
valve
fed
sweeping
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
JP14671379A
Other languages
Japanese (ja)
Inventor
Shigeru Yoshizawa
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.)
MITSUWA SEIKI CO Ltd
Sanwa Seiki Ltd
Original Assignee
MITSUWA SEIKI CO Ltd
Sanwa Seiki 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 MITSUWA SEIKI CO Ltd, Sanwa Seiki Ltd filed Critical MITSUWA SEIKI CO Ltd
Priority to JP14671379A priority Critical patent/JPS5670104A/en
Publication of JPS5670104A publication Critical patent/JPS5670104A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To enable performing of an easy switching operation with an extremely simple structure, by a method wherein a pilot check valve is placed between sweeping rooms at opposite ends of a piston, and the piston is positioned so that it can be switched in both directions by alternately operating the valve by means of an oil pressure signal.
CONSTITUTION: In the case of the expansion of an oil jack, a switch valve 4 is set at a position 4A, and a discharge oil pressure is transmitted to a sweeping chamber 1d through a check valve 3c with a manual pump 5 actuated. A pilot check valve 3e is opened with the discharge oil pressure fed through a pilot tube 4e and ports 4c and 4a, and thereby an oil pressure in a pipe line 3b is fed through the valve 3e to a sweeping chamber 1e as well. Thus, a piston 2 moves to the left due to a difference in a pressure acting area. In the meantime, in order to contract the jack from a state described above, that is, to move the piston 2 to the right, the switch valve 4 is switched to a position 4B, and the discharge oil pressure from the manual pump 5 is fed to only the sweeping chamber 1d.
COPYRIGHT: (C)1981,JPO&Japio
JP14671379A 1979-11-13 1979-11-13 Oil jack Pending JPS5670104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14671379A JPS5670104A (en) 1979-11-13 1979-11-13 Oil jack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14671379A JPS5670104A (en) 1979-11-13 1979-11-13 Oil jack

Publications (1)

Publication Number Publication Date
JPS5670104A true JPS5670104A (en) 1981-06-11

Family

ID=15413850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14671379A Pending JPS5670104A (en) 1979-11-13 1979-11-13 Oil jack

Country Status (1)

Country Link
JP (1) JPS5670104A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917002A (en) * 1982-07-21 1984-01-28 Nippon Steel Corp Hydraulic circuit
JPS59132901U (en) * 1983-02-25 1984-09-06 豊興工業株式会社 fluid control device
JPH08228862A (en) * 1995-02-28 1996-09-10 Okaki Fuanichiyaa:Kk Lock mechanism for drawers of furniture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917002A (en) * 1982-07-21 1984-01-28 Nippon Steel Corp Hydraulic circuit
JPS59132901U (en) * 1983-02-25 1984-09-06 豊興工業株式会社 fluid control device
JPH0239042Y2 (en) * 1983-02-25 1990-10-19
JPH08228862A (en) * 1995-02-28 1996-09-10 Okaki Fuanichiyaa:Kk Lock mechanism for drawers of furniture

Similar Documents

Publication Publication Date Title
JPS5670104A (en) Oil jack
JPS57184708A (en) Double cylinder device
JPS55135210A (en) Hydraulic cylinder device
JPS5527528A (en) Cylinder controller
JPS55163304A (en) Change-over device for reciprocation in double-acting cylinder
SE9503439D0 (en) Servo operated stop valve system
JPS54124172A (en) Reciprocal moving system
JPS57107405A (en) Hydraulic operating device
JPS56101402A (en) Reciprocating fluid type pressure actuator and quick coupler utilizing the same
JPS53404A (en) Hydraulic driving device for piston concrete pump
JPS563302A (en) Automatic piston stroke switching device for main fluid pressure cylinder and auxiliary fluid pressure cylinder
JPS5490465A (en) Joining hydraulic circuit
JPS5314277A (en) Fluid apparatus
JPS5783702A (en) Fluid pressure differential circuit
JPS55112462A (en) Three-way switching valve
JPS5779306A (en) Hydraulic circuit
JPS5594003A (en) Selecting device for hydraulic cylinder
JPS5737102A (en) Pressure augmentation hydraulic cylinder device
JPS57140904A (en) Liquid pressure circuit
JPS54117879A (en) Device for anchoring piston rod for piston and cylinder device
JPS5334111A (en) Closed compressor
JPS5431655A (en) Refrigeration cycle
JPS5219305A (en) Plunger pump
JPS53121206A (en) Airtight compressor
JPS53103204A (en) Oil pressure operating device for concrete pump