GB1294917A - - Google Patents

Info

Publication number
GB1294917A
GB1294917A GB3100570A GB1294917DA GB1294917A GB 1294917 A GB1294917 A GB 1294917A GB 3100570 A GB3100570 A GB 3100570A GB 1294917D A GB1294917D A GB 1294917DA GB 1294917 A GB1294917 A GB 1294917A
Authority
GB
United Kingdom
Prior art keywords
arms
pair
bar
urge
chocks
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
Application number
GB3100570A
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 filed Critical
Publication of GB1294917A publication Critical patent/GB1294917A/en
Expired 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • 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
    • E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
    • E21D23/0013—Frame type supports

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)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Body Structure For Vehicles (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

1294917 Advancing mine roof supports FLETCHER SUTCLIFFE WILD Ltd 18 May 1971 [26 June 1970] 31005/70 Heading E1P In an advancing mine roof support comprising a forward chock 1 and a pair of rearward chocks 3 adapted to be selectively advanced by a pair of jacks 5 and having a pair of cantilever arms 8 pivotably mounted on the rear chocks for relative sliding movement in the canopy 6 of the forward chock, a bar is located transversely of and beneath the two arms to urge them jointly into engagement with the roof to which end the bar is pivotable about its middle about an axis parallel to the axes of the two arms and is acted upon by means 26 to urge it upwardly. Side members 12 on the bar present disengagement of the arms 8.
GB3100570A 1970-06-26 1970-06-26 Expired GB1294917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3100570 1970-06-26

Publications (1)

Publication Number Publication Date
GB1294917A true GB1294917A (en) 1972-11-01

Family

ID=10316498

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3100570A Expired GB1294917A (en) 1970-06-26 1970-06-26

Country Status (3)

Country Link
US (1) US3754402A (en)
CA (1) CA942959A (en)
GB (1) GB1294917A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796853A (en) * 1987-12-22 1989-01-10 General Motors Corporation Remotely configurable solenoid driver circuit for direct pressure electronic transmission control

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1180955A (en) * 1956-08-18 1959-06-10 Dobson Ltd W E & F Improvements to ceiling supports for underground mines
DE1289805B (en) * 1962-01-29 1969-02-27 Groetschel Karl Maria Mechanically retractable face construction unit
GB1036663A (en) * 1964-04-03 1966-07-20 Gullick Ltd Improvements in or relating to mine roof and like supports
DE1281978B (en) * 1965-04-21 1968-11-07 Karl Maria Groetschel Dipl Ing Procedure for securing large areas of the hanging slope area exposed in the course of the cutting progress in mining operations
GB1182817A (en) * 1967-06-19 1970-03-04 Wild A G & Co Ltd Fluid-Operable Self-Advancing Mine Roof Support.
GB1234661A (en) * 1968-01-17 1971-06-09
DE1758753C3 (en) * 1968-08-02 1978-10-05 Hippel Geb. Weiss, Sophie Von, 7771 Oberstenweiler Hydraulic longwall construction

Also Published As

Publication number Publication date
US3754402A (en) 1973-08-28
CA942959A (en) 1974-03-05
DE2131776A1 (en) 1972-01-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee