GB292036A - Improvements relating to metallic pit props - Google Patents

Improvements relating to metallic pit props

Info

Publication number
GB292036A
GB292036A GB3507827A GB3507827A GB292036A GB 292036 A GB292036 A GB 292036A GB 3507827 A GB3507827 A GB 3507827A GB 3507827 A GB3507827 A GB 3507827A GB 292036 A GB292036 A GB 292036A
Authority
GB
United Kingdom
Prior art keywords
improvements relating
prop
adjusting element
tubular member
collapse
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
GB3507827A
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
Priority to GB3507827A priority Critical patent/GB292036A/en
Publication of GB292036A publication Critical patent/GB292036A/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
    • E21D15/02—Non-telescopic props
    • E21D15/06—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability
    • E21D15/10—Non-telescopic props with parts joined by a lock, with or without slight axial adjustability with dog-clutch or pin-and-hole connection

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)
  • Mechanical Operated Clutches (AREA)

Abstract

292,036. Wilson, J. Dec. 28, 1927. Mine props. - A collapsable prop comprises a tubular member 1 within which a slidable member 2 is supported by an adjusting element disposed within the tubular member. The adjusting element comprises dogclutch-like members 5, 6, the upper one of which is rotatable on the lower one by means of a lever 7, a right-angled slot being provided in the sleeve 1, as shown in Fig. 3, to allow relative rotation and collapse of the clutch elements. The engaging surfaces of the dogs may be inclined so that the pressure may be gradually reduced or relieved without actual collapse of the prop.
GB3507827A 1927-12-28 1927-12-28 Improvements relating to metallic pit props Expired GB292036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3507827A GB292036A (en) 1927-12-28 1927-12-28 Improvements relating to metallic pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3507827A GB292036A (en) 1927-12-28 1927-12-28 Improvements relating to metallic pit props

Publications (1)

Publication Number Publication Date
GB292036A true GB292036A (en) 1928-06-14

Family

ID=10373531

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3507827A Expired GB292036A (en) 1927-12-28 1927-12-28 Improvements relating to metallic pit props

Country Status (1)

Country Link
GB (1) GB292036A (en)

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