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GB497598A - Improvements in and relating to pit props - Google Patents

Improvements in and relating to pit props

Info

Publication number
GB497598A
GB497598A GB1755437A GB1755437A GB497598A GB 497598 A GB497598 A GB 497598A GB 1755437 A GB1755437 A GB 1755437A GB 1755437 A GB1755437 A GB 1755437A GB 497598 A GB497598 A GB 497598A
Authority
GB
United Kingdom
Prior art keywords
sleeve
bar
section
cap
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
GB1755437A
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
WILLIAM STANTON FLETCHER
Original Assignee
BUTTERLEY CO Ltd
WILLIAM STANTON FLETCHER
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, WILLIAM STANTON FLETCHER filed Critical BUTTERLEY CO Ltd
Priority to GB1755437A priority Critical patent/GB497598A/en
Publication of GB497598A publication Critical patent/GB497598A/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
    • E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
    • E21D15/18—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure
    • 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
    • E21D15/50—Component parts or details of props
    • 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
    • E21D15/50—Component parts or details of props
    • E21D15/52—Extensible units located above or below standard props
    • E21D15/526—Extensible units located above or below standard props for step-by-step extension of the prop

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)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

497,598. Pit-props. BUTTERLEY CO., Ltd., and FLETCHER, W. S. June 24, 1937, No. 17554. [Class 20 (ii)] A pit-prop of the type comprising a section-bar main-member 10 and a sliding-sleeve member 12 providedwith side apertures, through which the wooden pack. ing disposed above the main member in the sleeve may be inserted for adjustment, and expressed by collapse of the prop under pressure, has the upper end of the sleeve closed by a cap 13. The cap may have a flattened upper surface to contact with a wooden block or a channelled upper surface to receive the end 18 of a flat or corrugated bearer-bar. Pins 16 prevent complete detachment of the sleeve from the main member, and projections 17 limit the downward movement of the sleeve on the section-bar, and thus prevent the danger of trapped fingers between the cap and the head of the section-bar. The lower end of the sleeve may be shaped to fit the section-bar.
GB1755437A 1937-06-24 1937-06-24 Improvements in and relating to pit props Expired GB497598A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1755437A GB497598A (en) 1937-06-24 1937-06-24 Improvements in and relating to pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1755437A GB497598A (en) 1937-06-24 1937-06-24 Improvements in and relating to pit props

Publications (1)

Publication Number Publication Date
GB497598A true GB497598A (en) 1938-12-22

Family

ID=10097205

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1755437A Expired GB497598A (en) 1937-06-24 1937-06-24 Improvements in and relating to pit props

Country Status (1)

Country Link
GB (1) GB497598A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619302A (en) * 1948-08-25 1952-11-25 Alfred C Loedding Low aspect ratio aircraft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619302A (en) * 1948-08-25 1952-11-25 Alfred C Loedding Low aspect ratio aircraft

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