GB758308A - Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes - Google Patents

Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes

Info

Publication number
GB758308A
GB758308A GB3236954A GB3236954A GB758308A GB 758308 A GB758308 A GB 758308A GB 3236954 A GB3236954 A GB 3236954A GB 3236954 A GB3236954 A GB 3236954A GB 758308 A GB758308 A GB 758308A
Authority
GB
United Kingdom
Prior art keywords
face
latch
strut
chucks
props
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
GB3236954A
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 GB3236954A priority Critical patent/GB758308A/en
Publication of GB758308A publication Critical patent/GB758308A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/60Devices for withdrawing props or chocks

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)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

758,308. Chocks for supporting mine roofs. KAY, P. Dec. 6, 1954 [Nov. 9, 1954], No. 32369/54. Class 20(2). A chock of the kind having a vertical support 11 to which is pivoted a head 23 having an underhung swinging strut 1, has the end of the strut formed as a V, one face of which coacts with an inclined face 2 or a fixed secondary upright 6, whilst the other face coacts with an inclined face 7 on a member 8 which is pivoted at 9a to the member 6. The member 8 is retained in a position to support the strut 1, by a double armed latch 12a, whose arms are coupled by a bridle 13. The latch engages over projections 10 on the member 8, and is retained by projections 17 engaged by an arm 21 on a shaft 18 having cams 19a. Release of the chock is effected by rotating the shaft 18, as by an applied lever and chain, whereupon the arm 21 is disengaged from the latch, and the latter raised by the cams to disengage it from. the member 8. Specification 636,376 is referred to.
GB3236954A 1954-11-09 1954-11-09 Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes Expired GB758308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3236954A GB758308A (en) 1954-11-09 1954-11-09 Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3236954A GB758308A (en) 1954-11-09 1954-11-09 Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes

Publications (1)

Publication Number Publication Date
GB758308A true GB758308A (en) 1956-10-03

Family

ID=10337541

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3236954A Expired GB758308A (en) 1954-11-09 1954-11-09 Improvements in and relating to collapsible props or chucks for mine roof supports and like purposes

Country Status (1)

Country Link
GB (1) GB758308A (en)

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