GB972595A - Improvements in and relating to hydraulic mine roof supports - Google Patents

Improvements in and relating to hydraulic mine roof supports

Info

Publication number
GB972595A
GB972595A GB2393663A GB2393663A GB972595A GB 972595 A GB972595 A GB 972595A GB 2393663 A GB2393663 A GB 2393663A GB 2393663 A GB2393663 A GB 2393663A GB 972595 A GB972595 A GB 972595A
Authority
GB
United Kingdom
Prior art keywords
relating
mine roof
roof supports
indicator
hydraulic mine
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
GB2393663A
Inventor
Leslie Alva Fryatt
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.)
Mastabar Mining Equipment Co Ltd
Original Assignee
Mastabar Mining Equipment Co Ltd
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 Mastabar Mining Equipment Co Ltd filed Critical Mastabar Mining Equipment Co Ltd
Priority to GB2393663A priority Critical patent/GB972595A/en
Publication of GB972595A publication Critical patent/GB972595A/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
    • E21D15/46—Telescopic props with load-measuring devices; with alarm devices

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)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

972,595. Hydraulic pit props. MASTABAR MINING EQUIPMENT CO. Ltd. June 15, 1963, No. 23936/63. Heading E1E. [Also in Division G1] An hydraulic pit prop is provided with an indicator in the form of a pivoted needle or disc 20 to indicate compressive stress in the upper telescopic member 10, said indicator being operated by a push rod 12 which has one end 14 welded to the member 10. A hairpin loop 24 in the rod 12 and a screw 26 acting thereon serves as an adjustment control.
GB2393663A 1963-06-15 1963-06-15 Improvements in and relating to hydraulic mine roof supports Expired GB972595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2393663A GB972595A (en) 1963-06-15 1963-06-15 Improvements in and relating to hydraulic mine roof supports

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2393663A GB972595A (en) 1963-06-15 1963-06-15 Improvements in and relating to hydraulic mine roof supports

Publications (1)

Publication Number Publication Date
GB972595A true GB972595A (en) 1964-10-14

Family

ID=10203720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2393663A Expired GB972595A (en) 1963-06-15 1963-06-15 Improvements in and relating to hydraulic mine roof supports

Country Status (1)

Country Link
GB (1) GB972595A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288881A (en) * 1994-04-29 1995-11-01 Rollstud Ltd A strain indicator e.g.for bolts or studs
US5606132A (en) * 1994-04-29 1997-02-25 Simpson; Neil A. A. Strain indicator using an optical indicator means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288881A (en) * 1994-04-29 1995-11-01 Rollstud Ltd A strain indicator e.g.for bolts or studs
US5606132A (en) * 1994-04-29 1997-02-25 Simpson; Neil A. A. Strain indicator using an optical indicator means
GB2288881B (en) * 1994-04-29 1997-06-04 Rollstud Ltd Strain indicator

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