GB641644A - Improvements in roof supports for coal mines - Google Patents
Improvements in roof supports for coal minesInfo
- Publication number
- GB641644A GB641644A GB2624746A GB2624746A GB641644A GB 641644 A GB641644 A GB 641644A GB 2624746 A GB2624746 A GB 2624746A GB 2624746 A GB2624746 A GB 2624746A GB 641644 A GB641644 A GB 641644A
- Authority
- GB
- United Kingdom
- Prior art keywords
- uprights
- horizontal members
- joined
- coal mines
- clips
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/0213—Assembling devices for pivoting caps upwardly
Abstract
641,644. Mine supports. LEWIS, W. E. Aug. 31, 1946, No. 26247. [Class 20(ii)] A roof support for a coal mine comprises uprights supporting horizontal members A, the uprights being in two parts D, E made from H-section steel joined by fish plates F which fit exactly between the flanges of the uprights and are secured to them by nuts and bolts 1, 2, the uprights being joined to the horizontal members A by means of clips B, Fig. 4. The clips are bolted to the uprights. The uprights are mounted under the middle of the horizontal members and the supporting structure can be extended by adding further upright and horizontal members, the horizontal members being joined end to end by fish plates F, Fig. 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2624746A GB641644A (en) | 1946-08-31 | 1946-08-31 | Improvements in roof supports for coal mines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2624746A GB641644A (en) | 1946-08-31 | 1946-08-31 | Improvements in roof supports for coal mines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB641644A true GB641644A (en) | 1950-08-16 |
Family
ID=10240650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2624746A Expired GB641644A (en) | 1946-08-31 | 1946-08-31 | Improvements in roof supports for coal mines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB641644A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163195A (en) * | 1984-05-25 | 1986-02-19 | Caledonian Mining Co Ltd | A tunnel support joint |
-
1946
- 1946-08-31 GB GB2624746A patent/GB641644A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163195A (en) * | 1984-05-25 | 1986-02-19 | Caledonian Mining Co Ltd | A tunnel support joint |
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