GB681785A - Improvements in or relating to pit props - Google Patents

Improvements in or relating to pit props

Info

Publication number
GB681785A
GB681785A GB2060/51A GB206051A GB681785A GB 681785 A GB681785 A GB 681785A GB 2060/51 A GB2060/51 A GB 2060/51A GB 206051 A GB206051 A GB 206051A GB 681785 A GB681785 A GB 681785A
Authority
GB
United Kingdom
Prior art keywords
pit props
relating
jan
props
pit
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
GB2060/51A
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.)
Directie van de Staatsmijnen in Limburg
Original Assignee
Directie van de Staatsmijnen in Limburg
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 Directie van de Staatsmijnen in Limburg filed Critical Directie van de Staatsmijnen in Limburg
Publication of GB681785A publication Critical patent/GB681785A/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
    • E21D15/42—Telescopic props with parts held relatively to each other by friction or gripping with special parts to influence the friction

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)
  • Prevention Of Electric Corrosion (AREA)

Abstract

681,785. Pit props. DIRECTIE VAN DE STAATSMIJNEN IN LIMBURG. Jan. 26, 1951 [Jan. 31, 1950], No. 2060/51. Class 20(ii) The friction surfaces of sliding telescopic metal pit props are artificially corroded with for example dilute hydrochloric nitric or sulphuric acid.
GB2060/51A 1950-01-31 1951-01-26 Improvements in or relating to pit props Expired GB681785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL681785X 1950-01-31

Publications (1)

Publication Number Publication Date
GB681785A true GB681785A (en) 1952-10-29

Family

ID=19805387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2060/51A Expired GB681785A (en) 1950-01-31 1951-01-26 Improvements in or relating to pit props

Country Status (1)

Country Link
GB (1) GB681785A (en)

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