GB313899A - A steel pit prop - Google Patents

A steel pit prop

Info

Publication number
GB313899A
GB313899A GB824928A GB824928A GB313899A GB 313899 A GB313899 A GB 313899A GB 824928 A GB824928 A GB 824928A GB 824928 A GB824928 A GB 824928A GB 313899 A GB313899 A GB 313899A
Authority
GB
United Kingdom
Prior art keywords
wood
chamber
lbs
crushing
enclosing
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
GB824928A
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.)
JOSEPH MACLEOD CAREY
Original Assignee
JOSEPH MACLEOD CAREY
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 JOSEPH MACLEOD CAREY filed Critical JOSEPH MACLEOD CAREY
Priority to GB824928A priority Critical patent/GB313899A/en
Publication of GB313899A publication Critical patent/GB313899A/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
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/18—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure

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)
  • Carbon And Carbon Compounds (AREA)

Abstract

313,899. Carey, J. M., and Illingworth, S. R. March 19, 1928. Mine props. - A mine prop is formed of a tube a enclosing an upstanding rod d and an upper sliding piston-member f resting on a block of wood w or other crushable medium of less diameter than the enclosing chamber. By this arrangement, two separate yieldings are obtained under load, as shown in Fig. 5, the first due to the crushing of the block to fill the confining chamber at 35,000 lbs. pressure, and the second due to the crushing of the fibres of the wood in the chamber to 75,000 lbs. pressure, the total yield being about 2 ins. The rods may be hollow with bearing plates k interposed between them and the wood,
GB824928A 1928-03-19 1928-03-19 A steel pit prop Expired GB313899A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB824928A GB313899A (en) 1928-03-19 1928-03-19 A steel pit prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB824928A GB313899A (en) 1928-03-19 1928-03-19 A steel pit prop

Publications (1)

Publication Number Publication Date
GB313899A true GB313899A (en) 1929-06-19

Family

ID=9848866

Family Applications (1)

Application Number Title Priority Date Filing Date
GB824928A Expired GB313899A (en) 1928-03-19 1928-03-19 A steel pit prop

Country Status (1)

Country Link
GB (1) GB313899A (en)

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