GB878825A - Improvements relating to hydraulic pit-props - Google Patents

Improvements relating to hydraulic pit-props

Info

Publication number
GB878825A
GB878825A GB38570/57A GB3857057A GB878825A GB 878825 A GB878825 A GB 878825A GB 38570/57 A GB38570/57 A GB 38570/57A GB 3857057 A GB3857057 A GB 3857057A GB 878825 A GB878825 A GB 878825A
Authority
GB
United Kingdom
Prior art keywords
prop
props
spring
improvements relating
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
GB38570/57A
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.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade 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 Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Publication of GB878825A publication Critical patent/GB878825A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D15/54—Details of the ends of props
    • E21D15/55—Details of the ends of props of prop heads or feet

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)
  • Earth Drilling (AREA)
  • Clamps And Clips (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

878,825. Pit props. GUTEHOFFNUNGSHUTTE STERKRADE A. G. Dec. 11, 1957 Dec. 11, 1956], No. 38570/57. Class 20(2) An hydraulic telescopic pit prop is provided in its head with a spring-pressed rod 3 adapted to engage the mine roof and compress the spring 4 when the prop is set so that on release of the prop the spring overcomes initial friction and resistance and assists in collapsing the prop.
GB38570/57A 1956-12-11 1957-12-11 Improvements relating to hydraulic pit-props Expired GB878825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG21082A DE1106274B (en) 1956-12-11 1956-12-11 Hydraulic pit ram

Publications (1)

Publication Number Publication Date
GB878825A true GB878825A (en) 1961-10-04

Family

ID=7121643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38570/57A Expired GB878825A (en) 1956-12-11 1957-12-11 Improvements relating to hydraulic pit-props

Country Status (2)

Country Link
DE (1) DE1106274B (en)
GB (1) GB878825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421981A (en) * 1965-06-09 1969-01-14 Byron E Leach Production of therapeutic and prophylactic agent for upper respiratory infections

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1064378A (en) * 1912-09-13 1913-06-10 John Wilson Reed Protective device for mines.
US1685697A (en) * 1926-07-30 1928-09-25 Nathan M Guinsburg Jack
DE935121C (en) * 1953-03-03 1955-11-10 Gutehoffnungshuette Sterkrade Multi-part pit stamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421981A (en) * 1965-06-09 1969-01-14 Byron E Leach Production of therapeutic and prophylactic agent for upper respiratory infections

Also Published As

Publication number Publication date
DE1106274B (en) 1961-05-10

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