GB208963A - Improvements in apparatus for withdrawing pit-props - Google Patents

Improvements in apparatus for withdrawing pit-props

Info

Publication number
GB208963A
GB208963A GB789823A GB789823A GB208963A GB 208963 A GB208963 A GB 208963A GB 789823 A GB789823 A GB 789823A GB 789823 A GB789823 A GB 789823A GB 208963 A GB208963 A GB 208963A
Authority
GB
United Kingdom
Prior art keywords
lever
props
withdrawing
pit
sylvester
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
GB789823A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB789823A priority Critical patent/GB208963A/en
Publication of GB208963A publication Critical patent/GB208963A/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
    • E21D15/60—Devices for withdrawing props or chocks

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)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

208,963. Marshall, A. March 20. 1923. Lever load-handling machines.-The prop 4 to be withdrawn is engaged by pivotally-connected curved members 3, 7 having toothed, serrated, or otherwise roughened, inner surfaces. A lever 1 is pivoted at 2 to the member 3 and has a cam-shaped end 5 which bears against the member 7. The Sylvester or other hauling appliance is connected to a link 6 mounted in the end of the lever 1.
GB789823A 1923-03-20 1923-03-20 Improvements in apparatus for withdrawing pit-props Expired GB208963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB789823A GB208963A (en) 1923-03-20 1923-03-20 Improvements in apparatus for withdrawing pit-props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB789823A GB208963A (en) 1923-03-20 1923-03-20 Improvements in apparatus for withdrawing pit-props

Publications (1)

Publication Number Publication Date
GB208963A true GB208963A (en) 1924-01-03

Family

ID=9841918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB789823A Expired GB208963A (en) 1923-03-20 1923-03-20 Improvements in apparatus for withdrawing pit-props

Country Status (1)

Country Link
GB (1) GB208963A (en)

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