GB365556A - An improved pit prop - Google Patents

An improved pit prop

Info

Publication number
GB365556A
GB365556A GB2836430A GB2836430A GB365556A GB 365556 A GB365556 A GB 365556A GB 2836430 A GB2836430 A GB 2836430A GB 2836430 A GB2836430 A GB 2836430A GB 365556 A GB365556 A GB 365556A
Authority
GB
United Kingdom
Prior art keywords
prop
plunger
chamber
grooves
spring
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
GB2836430A
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.)
PATRICK AUSTIN BALL
Original Assignee
PATRICK AUSTIN BALL
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 PATRICK AUSTIN BALL filed Critical PATRICK AUSTIN BALL
Priority to GB2836430A priority Critical patent/GB365556A/en
Publication of GB365556A publication Critical patent/GB365556A/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
    • E21D15/14—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 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

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)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

365,556. Mine props. BALL, P. A., 55, Sebastopol, Hoyland, near Barnsley. Oct. 21, 1930, No. 28364. [Class 20 (ii).] A pit prop comprises a rigid standard 11 formed cone-shaped at its upper end and provided with grooves 14, and a cylindrical chamber 13 adapted to receive a plunger 17 to rest upon sand contained within the chamber. A spring-pressed conical seating valve 15 controls the grooves 14 through which the sand can escape to allow collapse of the prop. Notches 24 in the plunger and spring-pressed pawls 25 in the chamber coact to prevent separation of the plunger from the prop. A rotatable cam 18 may be provided at the upper end of the plunger to set the prop.
GB2836430A 1930-10-21 1930-10-21 An improved pit prop Expired GB365556A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2836430A GB365556A (en) 1930-10-21 1930-10-21 An improved pit prop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2836430A GB365556A (en) 1930-10-21 1930-10-21 An improved pit prop

Publications (1)

Publication Number Publication Date
GB365556A true GB365556A (en) 1932-01-21

Family

ID=10274488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2836430A Expired GB365556A (en) 1930-10-21 1930-10-21 An improved pit prop

Country Status (1)

Country Link
GB (1) GB365556A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413436A (en) * 1993-05-17 1995-05-09 Mbk-Hydraulik Meuwsen & Brockhausen Gmbh Support column

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413436A (en) * 1993-05-17 1995-05-09 Mbk-Hydraulik Meuwsen & Brockhausen Gmbh Support column

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