GB159942A - Improvements in or relating to pit props and the like - Google Patents

Improvements in or relating to pit props and the like

Info

Publication number
GB159942A
GB159942A GB2822819A GB2822819A GB159942A GB 159942 A GB159942 A GB 159942A GB 2822819 A GB2822819 A GB 2822819A GB 2822819 A GB2822819 A GB 2822819A GB 159942 A GB159942 A GB 159942A
Authority
GB
United Kingdom
Prior art keywords
wooden
central
relating
metal
props
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
GB2822819A
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.)
HENRY JOHN THACKERAY
Original Assignee
HENRY JOHN THACKERAY
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 HENRY JOHN THACKERAY filed Critical HENRY JOHN THACKERAY
Priority to GB2822819A priority Critical patent/GB159942A/en
Publication of GB159942A publication Critical patent/GB159942A/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
    • E21D15/02—Non-telescopic props
    • E21D15/04—Non-telescopic props with wooden prop parts joined by double conical connectors

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)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

159,942. Thackeray, H. J. Aug. 14, 1920. M i n e - props are formed of a central metal tubular portion a with a wooden filling and expanded ends and two end metal sleeves b partly cylindrical and partly conical, frictionally held on the central portion and adapted to hold removable end wooden portions c. The lower wooden end portion is coned at its outer end to render this the weakest portion of the prop. The friction between the end metal sleeves and the central metal portion may be increased by the insertion of a taper key d.
GB2822819A 1920-08-14 1920-08-14 Improvements in or relating to pit props and the like Expired GB159942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2822819A GB159942A (en) 1920-08-14 1920-08-14 Improvements in or relating to pit props and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2822819A GB159942A (en) 1920-08-14 1920-08-14 Improvements in or relating to pit props and the like

Publications (1)

Publication Number Publication Date
GB159942A true GB159942A (en) 1921-03-17

Family

ID=10272336

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2822819A Expired GB159942A (en) 1920-08-14 1920-08-14 Improvements in or relating to pit props and the like

Country Status (1)

Country Link
GB (1) GB159942A (en)

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