DE3734642C2 - - Google Patents

Info

Publication number
DE3734642C2
DE3734642C2 DE3734642A DE3734642A DE3734642C2 DE 3734642 C2 DE3734642 C2 DE 3734642C2 DE 3734642 A DE3734642 A DE 3734642A DE 3734642 A DE3734642 A DE 3734642A DE 3734642 C2 DE3734642 C2 DE 3734642C2
Authority
DE
Germany
Prior art keywords
cap
extendable
pledge
thrust piston
piston gear
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
Application number
DE3734642A
Other languages
German (de)
English (en)
Other versions
DE3734642A1 (de
Inventor
Roy Wigan Lancashire Gb Park
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.)
GULLICK DOBSON Ltd WIGAN LANCASHIRE GB
Original Assignee
GULLICK DOBSON Ltd WIGAN LANCASHIRE GB
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 GULLICK DOBSON Ltd WIGAN LANCASHIRE GB filed Critical GULLICK DOBSON Ltd WIGAN LANCASHIRE GB
Publication of DE3734642A1 publication Critical patent/DE3734642A1/de
Application granted granted Critical
Publication of DE3734642C2 publication Critical patent/DE3734642C2/de
Granted legal-status Critical Current

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
    • E21D23/063—Retractable 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)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
DE19873734642 1986-10-15 1987-10-13 Grubendachabstuetzungen Granted DE3734642A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8624745A GB2196371B (en) 1986-10-15 1986-10-15 Mine roof supports

Publications (2)

Publication Number Publication Date
DE3734642A1 DE3734642A1 (de) 1988-05-19
DE3734642C2 true DE3734642C2 (enExample) 1990-06-13

Family

ID=10605805

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873734642 Granted DE3734642A1 (de) 1986-10-15 1987-10-13 Grubendachabstuetzungen

Country Status (3)

Country Link
DE (1) DE3734642A1 (enExample)
GB (1) GB2196371B (enExample)
ZA (1) ZA877637B (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2220022B (en) * 1988-06-24 1992-06-10 Dowty Hucknall Limited Mine roof support
DE3833842C1 (en) * 1988-10-05 1989-08-31 Bochumer Eisenhuette Heintzmann Gmbh & Co Kg, 4630 Bochum, De Powered support assembly
GB9004181D0 (en) * 1990-02-23 1990-04-18 Gullick Dobson Ltd Mine roof supports and components therefor
CN111287781B (zh) * 2020-04-15 2025-04-29 四川嘉华机械有限责任公司 煤矿井下薄煤层液压支架拆卸装备

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657028A (en) * 1949-06-15 1953-10-27 Joy Mfg Co Walking jack
GB1001562A (en) * 1960-11-21 1965-08-18 Coal Industry Patents Ltd Fluid-pressure loading attachment for mine roof bars and mine roof support assemblies provided therewith
FR1303511A (fr) * 1961-07-22 1962-09-14 Mines Domaniales De Potasse Système de rallonges télescopiques à portance hydraulique pour éléments de soutènement en taille
GB977503A (en) * 1961-11-02 1964-12-09 Gullick Ltd Improvements in or relating to roof supporting means for mines
DE1200284B (de) * 1962-09-27 1965-09-09 Dow Chemical Co Verfahren zur Herstellung von 3, 3, 3-Trifluorpropen
GB1234661A (enExample) * 1968-01-17 1971-06-09
DE2027299A1 (de) * 1970-06-03 1971-12-09 Klöckner-Werke ,4100 Duisburg Kappenzug für Ausbaurahmen des wandernden Strebausbaus
GB1329125A (en) * 1970-12-02 1973-09-05 Gullick Dobson Ltd Mine roof supports
HU167711B (enExample) * 1973-12-07 1975-12-25
GB1583647A (en) * 1976-09-24 1981-01-28 Huwood Ltd Mine roof supports
GB1521581A (en) * 1977-02-11 1978-08-16 Fletcher Sutcliffe Wild Ltd Mine roof supports
GB2026581A (en) * 1978-07-18 1980-02-06 Fletcher Sutcliffer Wild Ltd Mining equipment
GB2048355A (en) * 1979-05-08 1980-12-10 Gewerk Eisenhuette Westfalia Mine roof supports
GB2115048B (en) * 1982-02-02 1985-08-29 Dobson Park Ind Mine roof supports
GB2129476B (en) * 1982-10-29 1986-08-06 Dowty Mining Equipment Ltd Self-advancing support and control means therefor

Also Published As

Publication number Publication date
GB2196371A (en) 1988-04-27
ZA877637B (en) 1988-04-18
GB2196371B (en) 1990-05-09
DE3734642A1 (de) 1988-05-19
GB8624745D0 (en) 1986-11-19

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
D2 Grant after examination
8363 Opposition against the patent
8339 Ceased/non-payment of the annual fee