GB748260A - Improvements in metal bars for supporting the roofs of underground workings - Google Patents
Improvements in metal bars for supporting the roofs of underground workingsInfo
- Publication number
- GB748260A GB748260A GB10610/55A GB1061055A GB748260A GB 748260 A GB748260 A GB 748260A GB 10610/55 A GB10610/55 A GB 10610/55A GB 1061055 A GB1061055 A GB 1061055A GB 748260 A GB748260 A GB 748260A
- Authority
- GB
- United Kingdom
- Prior art keywords
- roofs
- supporting
- recesses
- metal bars
- ges
- 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
- 239000002184 metal Substances 0.000 title abstract 2
- 230000003245 working effect Effects 0.000 title 1
- 238000005728 strengthening Methods 0.000 abstract 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
- E21D17/01—Caps for supporting mine roofs characterised by the shape of the cap, e.g. of specified cross-section
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)
- Body Structure For Vehicles (AREA)
Abstract
748,260. Mine-roof supports. GUTEHOFFNUNGSHUTTE STERKRADE AKT.-GES., [formerly GUTEHOFFNUNGSHUTTE OBERHAUSEN AKT.-GES.]. April 21, 1953 [April 26, 1952], No. 10610/55. Divided out of 748,226. Class 20(2) A metal I-sectioned bar for supporting mine roofs is provided with uniformly spaced recesses 6 in the underside of the lower flange 5 below the web 1 for engagement with a pair of projections on the prop head, the depth of the recesses being less than the thickness of the flange 5. The recesses 6 may be pressed in. The web 1 is provided on both sides with oblique strengthening ribs 3.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE748260X | 1952-04-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB748260A true GB748260A (en) | 1956-04-25 |
Family
ID=6648877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10610/55A Expired GB748260A (en) | 1952-04-26 | 1953-04-21 | Improvements in metal bars for supporting the roofs of underground workings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB748260A (en) |
-
1953
- 1953-04-21 GB GB10610/55A patent/GB748260A/en not_active Expired
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