GB2019476A - Sprag Plates for Mine Roof Supports - Google Patents

Sprag Plates for Mine Roof Supports

Info

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
Application number
GB7913866A
Other versions
GB2019476B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huwood Ltd
Original Assignee
Huwood Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Huwood Ltd filed Critical Huwood Ltd
Priority to GB7913866A priority Critical patent/GB2019476B/en
Publication of GB2019476A publication Critical patent/GB2019476A/en
Application granted granted Critical
Publication of GB2019476B publication Critical patent/GB2019476B/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E21D23/066Pivoted 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>
GB7913866A 1978-04-20 1979-04-20 Sprag plates for mine roof supports Expired GB2019476B (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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