GB776194A - Roof support structure for mine workings using props and pivotable girders - Google Patents
Roof support structure for mine workings using props and pivotable girdersInfo
- Publication number
- GB776194A GB776194A GB3732654A GB3732654A GB776194A GB 776194 A GB776194 A GB 776194A GB 3732654 A GB3732654 A GB 3732654A GB 3732654 A GB3732654 A GB 3732654A GB 776194 A GB776194 A GB 776194A
- Authority
- GB
- United Kingdom
- Prior art keywords
- girders
- girder
- props
- pivotable
- support structure
- 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
- 230000003245 working effect Effects 0.000 title 1
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
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)
Abstract
776,194. Mine roof supporting girders. GERLACH; H. Dec. 24, 1954, No. 37326/54. Class 20(2) Mine roof girders have girders at their engaging ends to guide into register the holes for the hinge pin connecting them. The forked end 8 of a girder 1 has ridges 7 on which is guided the bearing bosses 6 of the tongue 5 of the other girder 2, which bosses engage stops 7a when the holes for the hinge pin 3 register. A wedge 4 forces the girder 2 against the roof. In modifications the forked end is movable on its girder to the extent allowed by stops to facilitate the withdrawal of this girder. Also the ridges 7 may be at the top and bottom of the forked end 8 to allow the girders to be used when turned through 180 degrees. In another modification Figs. 9, 10 (not shown) the wedge 4 and pin 3 are in one piece and the ends of this piece are connected by a chain passing through a hole in the girder 1.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1117746D FR1117746A (en) | 1954-12-24 | 1954-12-21 | Timbering system for logging sites using states and hinged caps |
GB3732654A GB776194A (en) | 1954-12-24 | 1954-12-24 | Roof support structure for mine workings using props and pivotable girders |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3732654A GB776194A (en) | 1954-12-24 | 1954-12-24 | Roof support structure for mine workings using props and pivotable girders |
Publications (1)
Publication Number | Publication Date |
---|---|
GB776194A true GB776194A (en) | 1957-06-05 |
Family
ID=10395603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3732654A Expired GB776194A (en) | 1954-12-24 | 1954-12-24 | Roof support structure for mine workings using props and pivotable girders |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1117746A (en) |
GB (1) | GB776194A (en) |
-
1954
- 1954-12-21 FR FR1117746D patent/FR1117746A/en not_active Expired
- 1954-12-24 GB GB3732654A patent/GB776194A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1117746A (en) | 1956-05-25 |
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