GB724420A - Improvements in pit and like props - Google Patents

Improvements in pit and like props

Info

Publication number
GB724420A
GB724420A GB463253A GB463253A GB724420A GB 724420 A GB724420 A GB 724420A GB 463253 A GB463253 A GB 463253A GB 463253 A GB463253 A GB 463253A GB 724420 A GB724420 A GB 724420A
Authority
GB
United Kingdom
Prior art keywords
wedge
socket
pit
prop
hewitt
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
GB463253A
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 GB463253A priority Critical patent/GB724420A/en
Publication of GB724420A publication Critical patent/GB724420A/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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/285—Telescopic props with parts held relatively to each other by friction or gripping by means of wedges or wedge combinations

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)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

724,420. Pit props. HEWITT, H., and HEWITT, J. Feb. 19, 1953, No. 4632/53. Class 20(2). A pit prop comprises relatively slidable parts 1, 2 which are frictionally locked together by a wedge 5 which is squeezed upwardly when the load on the prop exceeds a predetermined amount, to allow the prop to shorten. The wedge 5 is mounted in a socket 3 on the part 2 between an inclined face 4 on the part 1 and an abutment member 6 in the socket 3, which is adjusted by a screw 9 and a wedge 7 to lie flat against the wedge 5. The position of the wedge 5 is indi. cated by a pin 10 which projects through the socket 3.
GB463253A 1953-02-19 1953-02-19 Improvements in pit and like props Expired GB724420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB463253A GB724420A (en) 1953-02-19 1953-02-19 Improvements in pit and like props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB463253A GB724420A (en) 1953-02-19 1953-02-19 Improvements in pit and like props

Publications (1)

Publication Number Publication Date
GB724420A true GB724420A (en) 1955-02-23

Family

ID=9780836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB463253A Expired GB724420A (en) 1953-02-19 1953-02-19 Improvements in pit and like props

Country Status (1)

Country Link
GB (1) GB724420A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856747A (en) * 1988-09-30 1989-08-15 Ganeaux Industries, Inc. Ratchet jack stand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856747A (en) * 1988-09-30 1989-08-15 Ganeaux Industries, Inc. Ratchet jack stand

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