GB661674A - Improvements in steel bars for use as mine roof supports - Google Patents
Improvements in steel bars for use as mine roof supportsInfo
- Publication number
- GB661674A GB661674A GB27671/48A GB2767148A GB661674A GB 661674 A GB661674 A GB 661674A GB 27671/48 A GB27671/48 A GB 27671/48A GB 2767148 A GB2767148 A GB 2767148A GB 661674 A GB661674 A GB 661674A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bar
- flanges
- pin
- coupling piece
- web
- 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
- 229910000831 Steel Inorganic materials 0.000 title abstract 2
- 239000010959 steel Substances 0.000 title abstract 2
- 230000008878 coupling Effects 0.000 abstract 6
- 238000010168 coupling process Methods 0.000 abstract 6
- 238000005859 coupling reaction Methods 0.000 abstract 6
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)
- Bridges Or Land Bridges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR661674X | 1947-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB661674A true GB661674A (en) | 1951-11-28 |
Family
ID=9011035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27671/48A Expired GB661674A (en) | 1947-11-17 | 1948-10-25 | Improvements in steel bars for use as mine roof supports |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR958217A (pt) |
| GB (1) | GB661674A (pt) |
-
0
- FR FR958217D patent/FR958217A/fr not_active Expired
-
1948
- 1948-10-25 GB GB27671/48A patent/GB661674A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR958217A (pt) | 1950-03-06 |
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