GB335836A - Improvements relating to collapsible pit props - Google Patents

Improvements relating to collapsible pit props

Info

Publication number
GB335836A
GB335836A GB3843129A GB3843129A GB335836A GB 335836 A GB335836 A GB 335836A GB 3843129 A GB3843129 A GB 3843129A GB 3843129 A GB3843129 A GB 3843129A GB 335836 A GB335836 A GB 335836A
Authority
GB
United Kingdom
Prior art keywords
teeth
improvements relating
wedge
pit props
collapsible
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
GB3843129A
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 GB3843129A priority Critical patent/GB335836A/en
Publication of GB335836A publication Critical patent/GB335836A/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
    • E21D15/06—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability
    • E21D15/10—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability with dog-clutch or pin-and-hole connection

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)
  • Pivots And Pivotal Connections (AREA)

Abstract

335,836. Shand, F. G. Dec. 16, 1929. Mine props of the type in which one member telescopes into another and the members are suppcrted in the extended position by means of a transverse wedge, have one face of the wedge formed smooth and tapered while the other face is formed with teeth 6 adapted to coact with teeth 7 on the upper abutment member 4. For collapse, the wedge is moved endwise whereupon the teeth 6, 7 interfit, allowing collapse of the member 8 with relation to the member 9.
GB3843129A 1929-12-16 1929-12-16 Improvements relating to collapsible pit props Expired GB335836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3843129A GB335836A (en) 1929-12-16 1929-12-16 Improvements relating to collapsible pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3843129A GB335836A (en) 1929-12-16 1929-12-16 Improvements relating to collapsible pit props

Publications (1)

Publication Number Publication Date
GB335836A true GB335836A (en) 1930-10-02

Family

ID=10403382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3843129A Expired GB335836A (en) 1929-12-16 1929-12-16 Improvements relating to collapsible pit props

Country Status (1)

Country Link
GB (1) GB335836A (en)

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