GB2019476A - Sprag Plates for Mine Roof Supports - Google Patents
Sprag Plates for Mine Roof SupportsInfo
- Publication number
- GB2019476A GB2019476A GB7913866A GB7913866A GB2019476A GB 2019476 A GB2019476 A GB 2019476A GB 7913866 A GB7913866 A GB 7913866A GB 7913866 A GB7913866 A GB 7913866A GB 2019476 A GB2019476 A GB 2019476A
- Authority
- GB
- United Kingdom
- Prior art keywords
- extension
- plate
- sprag
- ram
- pivoted
- 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.)
- Granted
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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
- E21D23/066—Pivoted cantilever extensions therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
The sprag plate 21 of a mine roof support is pivoted between a generally vertical (operative) position and a generally horizontal (retracted) position as a cantilever extension 22 on which it is mounted is extended and retracted. This is achieved by a ram 48 connected at 44 to links 43, slidably guided within the extension 22 and to which are pivoted further links 61 which are also pivoted to the sprag plate 21. As the ram 48 is retracted the links 43 slide relative to the extension 22 to which the sprag plate 21 is pivoted, thus causing it to swing into a longitudinal position. Further retraction of the ram causes retraction of the extension 22 relative to the roof plate 1. On extending the ram 48 the links 43 slide in the opposite direction relative to the extension 22 and cause the sprag plate to swing back into a vertical position, and further extension of the ram causes the extension 22 itself to extend relative to the roof plate 1. The roof plate 1 also contains a conventional cantilever extension 17 which is operated by a ram 15. One of the guides 18b of thin extension engages a plate 35 on the sprag plate 21 when the extension 22 is fully retracted to hold it horizontal. <IMAGE>
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7913866A GB2019476B (en) | 1978-04-20 | 1979-04-20 | Sprag plates for mine roof supports |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1563778 | 1978-04-20 | ||
GB7913866A GB2019476B (en) | 1978-04-20 | 1979-04-20 | Sprag plates for mine roof supports |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2019476A true GB2019476A (en) | 1979-10-31 |
GB2019476B GB2019476B (en) | 1982-06-09 |
Family
ID=26251442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7913866A Expired GB2019476B (en) | 1978-04-20 | 1979-04-20 | Sprag plates for mine roof supports |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2019476B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2523207A1 (en) * | 1982-04-29 | 1983-09-16 | Bergwerksverband Gmbh | Device for compression of infill material in mines - comprises compression plate fitted to rear of roof bar and expansible and retractable over width of lining frame |
FR2576058A1 (en) * | 1985-01-15 | 1986-07-18 | Bennes Marrel | Self-advancing support chock, particularly for mines |
DE3833842C1 (en) * | 1988-10-05 | 1989-08-31 | Bochumer Eisenhuette Heintzmann Gmbh & Co Kg, 4630 Bochum, De | Powered support assembly |
-
1979
- 1979-04-20 GB GB7913866A patent/GB2019476B/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2523207A1 (en) * | 1982-04-29 | 1983-09-16 | Bergwerksverband Gmbh | Device for compression of infill material in mines - comprises compression plate fitted to rear of roof bar and expansible and retractable over width of lining frame |
FR2576058A1 (en) * | 1985-01-15 | 1986-07-18 | Bennes Marrel | Self-advancing support chock, particularly for mines |
DE3833842C1 (en) * | 1988-10-05 | 1989-08-31 | Bochumer Eisenhuette Heintzmann Gmbh & Co Kg, 4630 Bochum, De | Powered support assembly |
Also Published As
Publication number | Publication date |
---|---|
GB2019476B (en) | 1982-06-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |