GB770305A - Improvements in and relating to underground roof supports - Google Patents

Improvements in and relating to underground roof supports

Info

Publication number
GB770305A
GB770305A GB1225954A GB1225954A GB770305A GB 770305 A GB770305 A GB 770305A GB 1225954 A GB1225954 A GB 1225954A GB 1225954 A GB1225954 A GB 1225954A GB 770305 A GB770305 A GB 770305A
Authority
GB
United Kingdom
Prior art keywords
disc
relating
rod
expanded
roof supports
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
GB1225954A
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.)
CHARLES PATRICK MACCARTHY
Original Assignee
CHARLES PATRICK MACCARTHY
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 CHARLES PATRICK MACCARTHY filed Critical CHARLES PATRICK MACCARTHY
Priority to GB1225954A priority Critical patent/GB770305A/en
Publication of GB770305A publication Critical patent/GB770305A/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
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/30—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber

Abstract

770,305. Pit props. MACCARTHY, C. P. April 27, 1955 [April 28, 1954], No. 12259/54. Class 20(2) The two parts a, b of a telescopic pit prop are clamped together by a rubber &c. member f carried by the inner member a on a rod d between a disc e and the end disc c of the member a and adapted to be expanded against the outer member b. The member f is expanded by moving the disc e towards the disc c by the rod d and an eccentric j<SP>1</SP>. The member f may be hollow and expanded by fluid compressed by a central plunger in the rod d Fig. 4 (not shown). A wedge m is used to set the prop.
GB1225954A 1955-04-27 1955-04-27 Improvements in and relating to underground roof supports Expired GB770305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1225954A GB770305A (en) 1955-04-27 1955-04-27 Improvements in and relating to underground roof supports

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1225954A GB770305A (en) 1955-04-27 1955-04-27 Improvements in and relating to underground roof supports

Publications (1)

Publication Number Publication Date
GB770305A true GB770305A (en) 1957-03-20

Family

ID=10001277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1225954A Expired GB770305A (en) 1955-04-27 1955-04-27 Improvements in and relating to underground roof supports

Country Status (1)

Country Link
GB (1) GB770305A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249837A (en) * 1978-11-03 1981-02-10 Heintzman GmbH & Co. Method of and apparatus for supporting an overburden

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249837A (en) * 1978-11-03 1981-02-10 Heintzman GmbH & Co. Method of and apparatus for supporting an overburden

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