GB921870A - Improvements in or relating to hydraulic props for mine roofs - Google Patents

Improvements in or relating to hydraulic props for mine roofs

Info

Publication number
GB921870A
GB921870A GB595560A GB595560A GB921870A GB 921870 A GB921870 A GB 921870A GB 595560 A GB595560 A GB 595560A GB 595560 A GB595560 A GB 595560A GB 921870 A GB921870 A GB 921870A
Authority
GB
United Kingdom
Prior art keywords
nozzle
relating
prop
hydraulic props
allow
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
GB595560A
Inventor
Robert Histon
Robert William Histon
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.)
AG Wild and Co Ltd
Original Assignee
AG Wild and 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 AG Wild and Co Ltd filed Critical AG Wild and Co Ltd
Priority to GB595560A priority Critical patent/GB921870A/en
Publication of GB921870A publication Critical patent/GB921870A/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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • 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
    • E21D15/58—Devices for setting props or chocks
    • E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
    • E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded

Abstract

921,870. Hydraulic pit-props. A. G. WILD & CO. Ltd. March 17, 1961 [Feb. 19, 1960], No. 5955/60. Class 20(2). An hydraulic pit-prop 10, 11 is provided with an inlet valve 30 adapted to be opened by a nozzle 35 urged into engagement therewith by a lever 37 on the nozzle engaging an abutment 38 on the member 10. A modified nozzle is used to allow contraction of the prop, see Fig. 2 (not shown). Excess pressure in the cylinder 10 acts on a piston 21 to overcome the force of a spring 24 and operate a relief valve 26 to allow an escape of fluid over a seating 27 to a bleed pipe 23.
GB595560A 1960-02-19 1960-02-19 Improvements in or relating to hydraulic props for mine roofs Expired GB921870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB595560A GB921870A (en) 1960-02-19 1960-02-19 Improvements in or relating to hydraulic props for mine roofs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB595560A GB921870A (en) 1960-02-19 1960-02-19 Improvements in or relating to hydraulic props for mine roofs

Publications (1)

Publication Number Publication Date
GB921870A true GB921870A (en) 1963-03-27

Family

ID=9805768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB595560A Expired GB921870A (en) 1960-02-19 1960-02-19 Improvements in or relating to hydraulic props for mine roofs

Country Status (1)

Country Link
GB (1) GB921870A (en)

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