GB238779A - Improved telescopic pit prop - Google Patents

Improved telescopic pit prop

Info

Publication number
GB238779A
GB238779A GB260525A GB260525A GB238779A GB 238779 A GB238779 A GB 238779A GB 260525 A GB260525 A GB 260525A GB 260525 A GB260525 A GB 260525A GB 238779 A GB238779 A GB 238779A
Authority
GB
United Kingdom
Prior art keywords
pit prop
improved telescopic
telescopic pit
prop
tapered inner
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
GB260525A
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.)
KARL DUENKELBERG
Vodafone GmbH
Original Assignee
KARL DUENKELBERG
Mannesmannroehren Werke 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 KARL DUENKELBERG, Mannesmannroehren Werke AG filed Critical KARL DUENKELBERG
Priority to GB260525A priority Critical patent/GB238779A/en
Publication of GB238779A publication Critical patent/GB238779A/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
    • E21D15/32—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring
    • E21D15/325—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring by a clamping ring

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

238,779. Mannesmannr÷hrenwerke, and D³nkelberg, K. Jan. 29, 1925. Mine props.-A telescopic mine prop comprising a clamping member engaging a tapered inner member a and resting on an outer member b, is provided with a packing d of compressible material between the clamp c and the outer surface of the tapered inner member, which allows the inner and outer members to telescope under pressure.
GB260525A 1925-01-29 1925-01-29 Improved telescopic pit prop Expired GB238779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB260525A GB238779A (en) 1925-01-29 1925-01-29 Improved telescopic pit prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB260525A GB238779A (en) 1925-01-29 1925-01-29 Improved telescopic pit prop

Publications (1)

Publication Number Publication Date
GB238779A true GB238779A (en) 1925-08-27

Family

ID=9742504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB260525A Expired GB238779A (en) 1925-01-29 1925-01-29 Improved telescopic pit prop

Country Status (1)

Country Link
GB (1) GB238779A (en)

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