GB684212A - Pit prop - Google Patents

Pit prop

Info

Publication number
GB684212A
GB684212A GB5895/51A GB589551A GB684212A GB 684212 A GB684212 A GB 684212A GB 5895/51 A GB5895/51 A GB 5895/51A GB 589551 A GB589551 A GB 589551A GB 684212 A GB684212 A GB 684212A
Authority
GB
United Kingdom
Prior art keywords
friction
deformable
march
wedge
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
GB5895/51A
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 GB684212A publication Critical patent/GB684212A/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)
  • Clamps And Clips (AREA)

Abstract

684,212. Pit props. DIRECTIE VAN DE :STAATSMIJNEN IN LIMBURG. March 12, 1951 [March 16, 1950]. No. 5895/51. Class 20 (ii). In a telescopic pit-prop collapsing against the resistance of frictional clamping means, one of the friction surfaces is on a part formed with a neck sc as to be deformable tc allow for irregularities or the other friction surface The friction wedge 8 is made deformable about vertical axes by reducing its cross section between its friction surfaces and the middle 13, against which bears the pressing plate 7. The wedge 8 may be made deformable about an horizontal axis. In a modification, a friction surface of a box section inner prop member bears against a wall connected by a resilient neck to the locking clamp.
GB5895/51A 1950-03-16 1951-03-12 Pit prop Expired GB684212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL684212X 1950-03-16

Publications (1)

Publication Number Publication Date
GB684212A true GB684212A (en) 1952-12-10

Family

ID=19805601

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5895/51A Expired GB684212A (en) 1950-03-16 1951-03-12 Pit prop

Country Status (1)

Country Link
GB (1) GB684212A (en)

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