GB668809A - A pit-lagging member connected to a second lagging member by a joint - Google Patents

A pit-lagging member connected to a second lagging member by a joint

Info

Publication number
GB668809A
GB668809A GB23175/50A GB2317550A GB668809A GB 668809 A GB668809 A GB 668809A GB 23175/50 A GB23175/50 A GB 23175/50A GB 2317550 A GB2317550 A GB 2317550A GB 668809 A GB668809 A GB 668809A
Authority
GB
United Kingdom
Prior art keywords
lagging member
joint
pit
lagging
sept
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
GB23175/50A
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 GB668809A publication Critical patent/GB668809A/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
    • E21D17/006—Caps for supporting mine roofs characterised by the material

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)
  • Connection Of Plates (AREA)
  • Clamps And Clips (AREA)
  • Laser Beam Processing (AREA)

Abstract

668,809. Making colliery lining members. GROETSCHEL, K. M. Sept. 21, 1950 [Sept. 26, 1949], No. 23175/50. Class 83 (ii). [Also in Group X] A pit lagging member a of light metal or alloy has a forked joint x of steel attached thereto. The joint may be a tongue on one lagging member engaging a fork on the other. This fork comprises two parts b<1>, b<2> having straps d<1>, d<2> which are clamped to the lagging member a by temporary clamps or permanent hollow rivets f or bolts and then welded together at c. The faces to be welded may have a tongue and groove engagement.
GB23175/50A 1949-09-26 1950-09-21 A pit-lagging member connected to a second lagging member by a joint Expired GB668809A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE668809X 1949-09-26

Publications (1)

Publication Number Publication Date
GB668809A true GB668809A (en) 1952-03-19

Family

ID=6590097

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23175/50A Expired GB668809A (en) 1949-09-26 1950-09-21 A pit-lagging member connected to a second lagging member by a joint

Country Status (1)

Country Link
GB (1) GB668809A (en)

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