JPS4912801B1 - - Google Patents
Info
- Publication number
- JPS4912801B1 JPS4912801B1 JP45004762A JP476270A JPS4912801B1 JP S4912801 B1 JPS4912801 B1 JP S4912801B1 JP 45004762 A JP45004762 A JP 45004762A JP 476270 A JP476270 A JP 476270A JP S4912801 B1 JPS4912801 B1 JP S4912801B1
- Authority
- JP
- Japan
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
- E21D23/0073—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices with advancing shifting devices connected therewith
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/12—Control, e.g. using remote control
- E21D23/14—Effecting automatic sequential movement of supports, e.g. one behind the other
- E21D23/144—Measuring the advance of support units with respect to internal points of reference, e.g. with respect to neighboring support units or extension of a cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691902194 DE1902194C3 (en) | 1969-01-17 | Control for a progressive expansion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS4912801B1 true JPS4912801B1 (en) | 1974-03-27 |
Family
ID=5722646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP45004762A Pending JPS4912801B1 (en) | 1969-01-17 | 1970-01-17 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS4912801B1 (en) |
| FR (1) | FR2028518A6 (en) |
| GB (1) | GB1299011A (en) |
-
1970
- 1970-01-15 FR FR7001349A patent/FR2028518A6/fr not_active Expired
- 1970-01-17 JP JP45004762A patent/JPS4912801B1/ja active Pending
- 1970-01-19 GB GB2573/70A patent/GB1299011A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2028518A6 (en) | 1970-10-09 |
| DE1902194A1 (en) | 1970-09-24 |
| DE1902194B2 (en) | 1976-04-22 |
| GB1299011A (en) | 1972-12-06 |