BE503400A - - Google Patents
Info
- Publication number
- BE503400A BE503400A BE503400DA BE503400A BE 503400 A BE503400 A BE 503400A BE 503400D A BE503400D A BE 503400DA BE 503400 A BE503400 A BE 503400A
- Authority
- BE
- Belgium
- Prior art keywords
- wedge
- bele
- head
- opening
- pivot
- Prior art date
Links
- 230000002441 reversible effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
- E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type
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)
- Harvester Elements (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE503400A true BE503400A (enExample) |
Family
ID=144593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE503400D BE503400A (enExample) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE503400A (enExample) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2991098A (en) * | 1948-07-08 | 1961-07-04 | Eisenwerk Wanheim G M B H Fa | Connecting structure for beams of a roof support or the like |
-
0
- BE BE503400D patent/BE503400A/fr unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2991098A (en) * | 1948-07-08 | 1961-07-04 | Eisenwerk Wanheim G M B H Fa | Connecting structure for beams of a roof support or the like |
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