GB294913A - Improvements in adjustable pit props - Google Patents

Improvements in adjustable pit props

Info

Publication number
GB294913A
GB294913A GB1148527A GB1148527A GB294913A GB 294913 A GB294913 A GB 294913A GB 1148527 A GB1148527 A GB 1148527A GB 1148527 A GB1148527 A GB 1148527A GB 294913 A GB294913 A GB 294913A
Authority
GB
United Kingdom
Prior art keywords
packing
slots
bolt
resistance
increase
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
GB1148527A
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.)
BUTTERLEY CO Ltd
CHARLES LLOYD MACCARTHY
Original Assignee
BUTTERLEY CO Ltd
CHARLES LLOYD MACCARTHY
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 BUTTERLEY CO Ltd, CHARLES LLOYD MACCARTHY filed Critical BUTTERLEY CO Ltd
Priority to GB1148527A priority Critical patent/GB294913A/en
Publication of GB294913A publication Critical patent/GB294913A/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
    • E21D15/38—Telescopic props with parts held relatively to each other by friction or gripping with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations

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)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

294,913. Maccarthy, C. L., and Butterley Co., Ltd. April 29, 1927. Mine props.-A telescoping pit prop is formed in two metal parts, the lower a being of sectionbar having a transverse member f at its upper end and the upper b a double-web section-bar provided with an open end and slots g in the webs so that it can slide over and embrace the web of the lower member. In the form shown, the transverse member comprises a bolt f provided with packing h on each side tn increase the resistance to sliding. A lower guide-bolt k may also be provided and this may have packing to increase the resistance to slip. In a modification, the sliding members 2, 3 are of circular section, the upper member being provided with flattened surfaces 5 at the slots against which the packing h abuts, and washers may be provided to prevent the packing from entering the slots.
GB1148527A 1927-04-29 1927-04-29 Improvements in adjustable pit props Expired GB294913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1148527A GB294913A (en) 1927-04-29 1927-04-29 Improvements in adjustable pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1148527A GB294913A (en) 1927-04-29 1927-04-29 Improvements in adjustable pit props

Publications (1)

Publication Number Publication Date
GB294913A true GB294913A (en) 1928-07-30

Family

ID=9987116

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1148527A Expired GB294913A (en) 1927-04-29 1927-04-29 Improvements in adjustable pit props

Country Status (1)

Country Link
GB (1) GB294913A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590862A (en) * 1993-11-25 1997-01-07 Ono; Tatsuo Device for adjusting the length of a support
CN115323893A (en) * 2022-08-31 2022-11-11 中国建筑第二工程局有限公司 Foundation pit slope turnover type steel trestle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590862A (en) * 1993-11-25 1997-01-07 Ono; Tatsuo Device for adjusting the length of a support
CN115323893A (en) * 2022-08-31 2022-11-11 中国建筑第二工程局有限公司 Foundation pit slope turnover type steel trestle

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