JPS5715103A - Falloff preventive circuit for liquid pressure cylinder - Google Patents
Falloff preventive circuit for liquid pressure cylinderInfo
- Publication number
- JPS5715103A JPS5715103A JP8772280A JP8772280A JPS5715103A JP S5715103 A JPS5715103 A JP S5715103A JP 8772280 A JP8772280 A JP 8772280A JP 8772280 A JP8772280 A JP 8772280A JP S5715103 A JPS5715103 A JP S5715103A
- Authority
- JP
- Japan
- Prior art keywords
- selector valve
- speed sensor
- preset value
- output
- stop position
- 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
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To prevent unrestrained fall of a liquid pressure cylinder at the rupture time of pipings of an oil-hydraulic shovel etc. by providing a selector valve and a speed sensor on the exhaust side at the unrestrained falling time of the cylinder and by arranging so that the selector valve is set to the stop position when the output of the speed sensor exceed a certain preset value.
CONSTITUTION: A selector valve with detent, 8, is arranged in a pipeline 5, and a speed sensor composed of a stroke gauge 10 to sense the stroke and a differential operator 11 is provided, where the selector valve 8 is held in the operation position normally and changed over to the stop position when the output of the differential operator 11 exceeds a certain preset value. Thereby, even rupture of the line 5 will not lead to unrestrained fall of the oil-hydraulic cylinder 2 because the selector valve 8 is changed over to the stop position when the output of the differential operator 11 exceeds the preset value. Not even hunting will occur because no counterbalance valve is used.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8772280A JPS5715103A (en) | 1980-06-30 | 1980-06-30 | Falloff preventive circuit for liquid pressure cylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8772280A JPS5715103A (en) | 1980-06-30 | 1980-06-30 | Falloff preventive circuit for liquid pressure cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5715103A true JPS5715103A (en) | 1982-01-26 |
Family
ID=13922795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8772280A Pending JPS5715103A (en) | 1980-06-30 | 1980-06-30 | Falloff preventive circuit for liquid pressure cylinder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5715103A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6131704A (en) * | 1984-07-20 | 1986-02-14 | Kayaba Ind Co Ltd | Control device of counterbalance valve |
JPS6131705A (en) * | 1984-07-20 | 1986-02-14 | Kayaba Ind Co Ltd | Control device of counterbalance valve |
JPS6138201A (en) * | 1984-07-31 | 1986-02-24 | Kayaba Ind Co Ltd | Control device for counterbalance valve |
JPS6182009A (en) * | 1984-09-21 | 1986-04-25 | Kayaba Ind Co Ltd | Controller of counterbalance valve |
US8245446B2 (en) | 2009-06-23 | 2012-08-21 | Hp Doors, Llc | Tilt-up door |
US9091107B2 (en) | 2009-06-23 | 2015-07-28 | Hp Doors, Llc | Tilt-up door |
US9428951B2 (en) | 2009-06-23 | 2016-08-30 | Hp Doors, Llc | Tilt-up door |
US9631418B2 (en) | 2014-06-25 | 2017-04-25 | Phillip A. Crown | Hydraulically operated overhead tilt-up door with stabilizer |
US10208529B2 (en) | 2009-06-23 | 2019-02-19 | Higher Power Hydraulic Doors, Llc | Tilt-up door |
-
1980
- 1980-06-30 JP JP8772280A patent/JPS5715103A/en active Pending
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6131704A (en) * | 1984-07-20 | 1986-02-14 | Kayaba Ind Co Ltd | Control device of counterbalance valve |
JPS6131705A (en) * | 1984-07-20 | 1986-02-14 | Kayaba Ind Co Ltd | Control device of counterbalance valve |
JPH0456886B2 (en) * | 1984-07-20 | 1992-09-09 | Kayaba Industry Co Ltd | |
JPH0456885B2 (en) * | 1984-07-20 | 1992-09-09 | Kayaba Industry Co Ltd | |
JPS6138201A (en) * | 1984-07-31 | 1986-02-24 | Kayaba Ind Co Ltd | Control device for counterbalance valve |
JPS6182009A (en) * | 1984-09-21 | 1986-04-25 | Kayaba Ind Co Ltd | Controller of counterbalance valve |
US8245446B2 (en) | 2009-06-23 | 2012-08-21 | Hp Doors, Llc | Tilt-up door |
US8539716B2 (en) | 2009-06-23 | 2013-09-24 | Hp Doors, Llc | Tilt-up door |
US8769871B2 (en) | 2009-06-23 | 2014-07-08 | Hp Doors, Llc | Tilt-up door |
US9015996B2 (en) | 2009-06-23 | 2015-04-28 | Hp Doors, Llc | Tilt-up door |
US9091107B2 (en) | 2009-06-23 | 2015-07-28 | Hp Doors, Llc | Tilt-up door |
US9404301B2 (en) | 2009-06-23 | 2016-08-02 | Hp Doors, Llc | Tilt-up door |
US9428951B2 (en) | 2009-06-23 | 2016-08-30 | Hp Doors, Llc | Tilt-up door |
US10208529B2 (en) | 2009-06-23 | 2019-02-19 | Higher Power Hydraulic Doors, Llc | Tilt-up door |
US9631418B2 (en) | 2014-06-25 | 2017-04-25 | Phillip A. Crown | Hydraulically operated overhead tilt-up door with stabilizer |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5715103A (en) | Falloff preventive circuit for liquid pressure cylinder | |
JPS5325771A (en) | Oil pressure anti-skid device | |
JPS56104186A (en) | Flow controller for power steering working fluid | |
JPS5332264A (en) | Direct coupled clutch-loaded fluid transmission mechanism | |
JPS5715158A (en) | Counterbalance valve device | |
JPS57110856A (en) | Controller of oil hydraulic device | |
JPS52151903A (en) | Hydraulic device | |
JPS5643033A (en) | Four wheel drive with automatic transmission | |
JPS5715104A (en) | Falloff preventive circuit for liquid pressure cylinder | |
JPS54156985A (en) | Safety device of hydraulic circuit having a plurality of actuators | |
JPS566944A (en) | Hydraulic control device for automatic transmission | |
JPS57186601A (en) | Hydraulic sudden change preventing device of hydraulic driving system | |
JPS57157802A (en) | Surge pressure absorber circuit | |
JPS5773235A (en) | Protective device in working oil pressre circuit of pressure oil clutch | |
JPS5614604A (en) | Hydraulic circuit | |
JPS56153102A (en) | Decompression circuit for cylinder | |
JPS52142102A (en) | Load runback control system for air extracting back pressure turbine | |
JPS5735112A (en) | Protector for lubricating oil line of steam turbine | |
JPS5578846A (en) | Control device of automatic change gear | |
JPS53105613A (en) | Turbine main oil pump trip system | |
JPS57107403A (en) | Hydraulic control unit | |
JPS5644475A (en) | High pressure generating device | |
JPS5350508A (en) | Operation strength selecting device for hand pump | |
JPS5752605A (en) | Generating plant by steam turbine | |
JPS5491802A (en) | Electromagnetic valve type pump ejection control circuit |