JPS56427A - Operating device for hydraulic shovel - Google Patents
Operating device for hydraulic shovelInfo
- Publication number
- JPS56427A JPS56427A JP7541879A JP7541879A JPS56427A JP S56427 A JPS56427 A JP S56427A JP 7541879 A JP7541879 A JP 7541879A JP 7541879 A JP7541879 A JP 7541879A JP S56427 A JPS56427 A JP S56427A
- Authority
- JP
- Japan
- Prior art keywords
- boom
- over valve
- change
- rod
- divided
- 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.)
- Granted
Links
Landscapes
- Operation Control Of Excavators (AREA)
Abstract
PURPOSE: To keep a depth of excavation constant and to decrease a fatigue of the operator by a method wherein a piping connecting a rod of the boom cylinder to a boom control valve is divided and then the divided pipes are connected to the hydraulic oil reservoir via change-over valve.
CONSTITUTION: The piping connecting the rod 13 of the boom cylinder to the boom control valve 12 is divided, the other end of the dividing pipe is connected to the hydraulic reservoir tank 23 via change-over valve 20. The change-over valve 20 is always blocked, and when a large excavation force is required under a simultaneous operation of pulling of the arm and the lowering of the boom, the change-over valve is opened via linkages 14, 18a, 19 and the hydraulic pressure at the rod of the boom cylinder is adjusted to produce a large excavation force on the block. In case of a single pulling operation of the arm, the hydraulic oil is returned back to the tank 23 via change-over valve 20, the boom is returned back to its lifted position to decrease a resistance of excavation so that the operator's fatigue is decreased.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7541879A JPS56427A (en) | 1979-06-15 | 1979-06-15 | Operating device for hydraulic shovel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7541879A JPS56427A (en) | 1979-06-15 | 1979-06-15 | Operating device for hydraulic shovel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56427A true JPS56427A (en) | 1981-01-06 |
JPS6160931B2 JPS6160931B2 (en) | 1986-12-23 |
Family
ID=13575608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7541879A Granted JPS56427A (en) | 1979-06-15 | 1979-06-15 | Operating device for hydraulic shovel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56427A (en) |
-
1979
- 1979-06-15 JP JP7541879A patent/JPS56427A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6160931B2 (en) | 1986-12-23 |
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