FR1255432A - Pile d'étançons à commande hydraulique du déplacement - Google Patents
Pile d'étançons à commande hydraulique du déplacementInfo
- Publication number
- FR1255432A FR1255432A FR816675A FR816675A FR1255432A FR 1255432 A FR1255432 A FR 1255432A FR 816675 A FR816675 A FR 816675A FR 816675 A FR816675 A FR 816675A FR 1255432 A FR1255432 A FR 1255432A
- Authority
- FR
- France
- Prior art keywords
- props
- stack
- displacement control
- hydraulic displacement
- hydraulic
- 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.)
- Expired
Links
- 238000006073 displacement reaction Methods 0.000 title 1
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
- E21D23/0082—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor specially adapted for vertical or steep gradient seams
-
- 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
- E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
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)
- Generation Of Surge Voltage And Current (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR816675A FR1255432A (fr) | 1960-01-26 | 1960-01-26 | Pile d'étançons à commande hydraulique du déplacement |
GB237361A GB915998A (en) | 1960-01-26 | 1961-01-20 | Improvements in or relating to pit-prop assemblies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR816675A FR1255432A (fr) | 1960-01-26 | 1960-01-26 | Pile d'étançons à commande hydraulique du déplacement |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1255432A true FR1255432A (fr) | 1961-03-10 |
Family
ID=8724316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR816675A Expired FR1255432A (fr) | 1960-01-26 | 1960-01-26 | Pile d'étançons à commande hydraulique du déplacement |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1255432A (fr) |
GB (1) | GB915998A (fr) |
-
1960
- 1960-01-26 FR FR816675A patent/FR1255432A/fr not_active Expired
-
1961
- 1961-01-20 GB GB237361A patent/GB915998A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB915998A (en) | 1963-01-16 |
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