GB1071672A - An improved hydraulic pit prop - Google Patents

An improved hydraulic pit prop

Info

Publication number
GB1071672A
GB1071672A GB3005863A GB3005863A GB1071672A GB 1071672 A GB1071672 A GB 1071672A GB 3005863 A GB3005863 A GB 3005863A GB 3005863 A GB3005863 A GB 3005863A GB 1071672 A GB1071672 A GB 1071672A
Authority
GB
United Kingdom
Prior art keywords
hydraulic pit
pit prop
improved hydraulic
july
pump
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
GB3005863A
Inventor
Laurence William Taylor
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.)
Dobson Ltd W E & F
WE&F Dobson Ltd
Original Assignee
Dobson Ltd W E & F
WE&F Dobson 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 Dobson Ltd W E & F, WE&F Dobson Ltd filed Critical Dobson Ltd W E & F
Priority to GB3005863A priority Critical patent/GB1071672A/en
Publication of GB1071672A publication Critical patent/GB1071672A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Abstract

1,071,672. Hydraulic pit props. W. E. & F. DOBSON Ltd. July 22, 1964 [July 30, 1963], No. 30058/63. Heading E1E. In an hydraulic pit prop provided with a pump 4, a relief valve 12 and a release valve 9, the units 4, 9 are each connected to crank mechanisms 26, 18 respectively for individual control purposes, the actuating tool of the crank 18 also operating an air release valve 21. The pump may be actuated by a chain and sprocket mechanism, see Figs. 2 and 3 (not shown).
GB3005863A 1963-07-30 1963-07-30 An improved hydraulic pit prop Expired GB1071672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3005863A GB1071672A (en) 1963-07-30 1963-07-30 An improved hydraulic pit prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3005863A GB1071672A (en) 1963-07-30 1963-07-30 An improved hydraulic pit prop

Publications (1)

Publication Number Publication Date
GB1071672A true GB1071672A (en) 1967-06-14

Family

ID=10301578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3005863A Expired GB1071672A (en) 1963-07-30 1963-07-30 An improved hydraulic pit prop

Country Status (1)

Country Link
GB (1) GB1071672A (en)

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