GB704296A - Improvements in or relating to metal props for mines and the like - Google Patents

Improvements in or relating to metal props for mines and the like

Info

Publication number
GB704296A
GB704296A GB3276/52A GB327652A GB704296A GB 704296 A GB704296 A GB 704296A GB 3276/52 A GB3276/52 A GB 3276/52A GB 327652 A GB327652 A GB 327652A GB 704296 A GB704296 A GB 704296A
Authority
GB
United Kingdom
Prior art keywords
mines
relating
lever
feb
pivot
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
GB3276/52A
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
Publication of GB704296A publication Critical patent/GB704296A/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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations

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)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

Abstract

704,296. Pit props. SMAL, G. Feb. 7, 1952 [Feb. 7, 1951], No. 3276/52. Addition to 680,616. Class 20 (2) The pit prop of the parent Specification is modified by arranging the eccentric member 14 above the pivot 17 of the lever so that the lever moves inwards to release the prop and does not project when released. The lever is held in operative position by an abutment 25 pivoted between an extension of the cheeks 2 supporting the pivot 17.
GB3276/52A 1951-02-07 1952-02-07 Improvements in or relating to metal props for mines and the like Expired GB704296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE704296X 1951-02-07

Publications (1)

Publication Number Publication Date
GB704296A true GB704296A (en) 1954-02-17

Family

ID=3878458

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3276/52A Expired GB704296A (en) 1951-02-07 1952-02-07 Improvements in or relating to metal props for mines and the like

Country Status (1)

Country Link
GB (1) GB704296A (en)

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