GB2243394B - Mine roof supports - Google Patents
Mine roof supportsInfo
- Publication number
- GB2243394B GB2243394B GB9108582A GB9108582A GB2243394B GB 2243394 B GB2243394 B GB 2243394B GB 9108582 A GB9108582 A GB 9108582A GB 9108582 A GB9108582 A GB 9108582A GB 2243394 B GB2243394 B GB 2243394B
- Authority
- GB
- United Kingdom
- Prior art keywords
- mine roof
- roof supports
- supports
- mine
- roof
- 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 - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
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)
- Safety Valves (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909009584A GB9009584D0 (en) | 1990-04-28 | 1990-04-28 | Mine roof supports |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9108582D0 GB9108582D0 (en) | 1991-06-05 |
GB2243394A GB2243394A (en) | 1991-10-30 |
GB2243394B true GB2243394B (en) | 1993-11-10 |
Family
ID=10675159
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB909009584A Pending GB9009584D0 (en) | 1990-04-28 | 1990-04-28 | Mine roof supports |
GB9108582A Expired - Fee Related GB2243394B (en) | 1990-04-28 | 1991-04-22 | Mine roof supports |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB909009584A Pending GB9009584D0 (en) | 1990-04-28 | 1990-04-28 | Mine roof supports |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB9009584D0 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2116618A (en) * | 1982-03-06 | 1983-09-28 | Dowty Mining Equipment Ltd | Mine roof supports |
-
1990
- 1990-04-28 GB GB909009584A patent/GB9009584D0/en active Pending
-
1991
- 1991-04-22 GB GB9108582A patent/GB2243394B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2116618A (en) * | 1982-03-06 | 1983-09-28 | Dowty Mining Equipment Ltd | Mine roof supports |
Also Published As
Publication number | Publication date |
---|---|
GB9108582D0 (en) | 1991-06-05 |
GB2243394A (en) | 1991-10-30 |
GB9009584D0 (en) | 1990-06-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950422 |