GB425120A - Improvements in or relating to pit props - Google Patents

Improvements in or relating to pit props

Info

Publication number
GB425120A
GB425120A GB2462633A GB2462633A GB425120A GB 425120 A GB425120 A GB 425120A GB 2462633 A GB2462633 A GB 2462633A GB 2462633 A GB2462633 A GB 2462633A GB 425120 A GB425120 A GB 425120A
Authority
GB
United Kingdom
Prior art keywords
prop
supporting
head
bar
wedge
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
GB2462633A
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 GB2462633A priority Critical patent/GB425120A/en
Publication of GB425120A publication Critical patent/GB425120A/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
    • E21D15/52—Extensible units located above or below standard props

Abstract

425,120. Wedges. MOORE, M. S., Ivanhoe, Worcester Road, Malvern, Worcestershire. Sept. 5, 1933, Nos. 24626/33 and 17616/34. [Class 89 (ii)] [See also Group X] Supporting-bars or straps for mine roofs are supported in the adjustable headpieces of extensible props in such manner that the bars may be wedged up to working position without reducing the pressure on the props. The bodypart 4 of the adjustable head of the prop is of cruciform shape, Fig. 3, with inclined surfaces 6, 7 disposed at right-angles to each other, and the head comprises also side portions 5, 10, the latter of which act as guides on the upper end of the prop 1. The opening 9 through the headpiece may be closed at the top, or the upper ends of the sides may have plates 13 attached thereto so that internal flanges 12 are formed to receive a bearing-plate 14 for the transverse roof-supporting bar 11. The head of the prop is first forced against the roof by means of a wedge 3 inserted between the prop 1 and the body-part 4 of the head, and after the supporting-bar 11 has been positioned in the head, it is forced up to the plate 14 by a separate wedge 8, after which the usual packing 15 is inserted between the supporting-bar and the roof. In order to allow of various inclinations of the supporting-bar with respect to the prop, one of the faces of both the wedge 8 and bearing-plate 14 is curved.
GB2462633A 1933-09-05 1933-09-05 Improvements in or relating to pit props Expired GB425120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2462633A GB425120A (en) 1933-09-05 1933-09-05 Improvements in or relating to pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2462633A GB425120A (en) 1933-09-05 1933-09-05 Improvements in or relating to pit props

Publications (1)

Publication Number Publication Date
GB425120A true GB425120A (en) 1935-03-05

Family

ID=10214651

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2462633A Expired GB425120A (en) 1933-09-05 1933-09-05 Improvements in or relating to pit props

Country Status (1)

Country Link
GB (1) GB425120A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723100A (en) * 1951-04-13 1955-11-08 Muschamp Norman James Releasable supports for roofs in underground mines
DE974055C (en) * 1944-02-29 1960-09-01 Alexander Dr-Ing Schmidt Pit stamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974055C (en) * 1944-02-29 1960-09-01 Alexander Dr-Ing Schmidt Pit stamp
US2723100A (en) * 1951-04-13 1955-11-08 Muschamp Norman James Releasable supports for roofs in underground mines

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