GB748260A - Improvements in metal bars for supporting the roofs of underground workings - Google Patents

Improvements in metal bars for supporting the roofs of underground workings

Info

Publication number
GB748260A
GB748260A GB10610/55A GB1061055A GB748260A GB 748260 A GB748260 A GB 748260A GB 10610/55 A GB10610/55 A GB 10610/55A GB 1061055 A GB1061055 A GB 1061055A GB 748260 A GB748260 A GB 748260A
Authority
GB
United Kingdom
Prior art keywords
roofs
supporting
recesses
metal bars
ges
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
GB10610/55A
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.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade AG
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 Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Publication of GB748260A publication Critical patent/GB748260A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/01—Caps for supporting mine roofs characterised by the shape of the cap, e.g. of specified cross-section

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

748,260. Mine-roof supports. GUTEHOFFNUNGSHUTTE STERKRADE AKT.-GES., [formerly GUTEHOFFNUNGSHUTTE OBERHAUSEN AKT.-GES.]. April 21, 1953 [April 26, 1952], No. 10610/55. Divided out of 748,226. Class 20(2) A metal I-sectioned bar for supporting mine roofs is provided with uniformly spaced recesses 6 in the underside of the lower flange 5 below the web 1 for engagement with a pair of projections on the prop head, the depth of the recesses being less than the thickness of the flange 5. The recesses 6 may be pressed in. The web 1 is provided on both sides with oblique strengthening ribs 3.
GB10610/55A 1952-04-26 1953-04-21 Improvements in metal bars for supporting the roofs of underground workings Expired GB748260A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE748260X 1952-04-26

Publications (1)

Publication Number Publication Date
GB748260A true GB748260A (en) 1956-04-25

Family

ID=6648877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10610/55A Expired GB748260A (en) 1952-04-26 1953-04-21 Improvements in metal bars for supporting the roofs of underground workings

Country Status (1)

Country Link
GB (1) GB748260A (en)

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