GB911588A - Improvements in or relating to hydropneumatic pit props - Google Patents

Improvements in or relating to hydropneumatic pit props

Info

Publication number
GB911588A
GB911588A GB41005/60A GB4100560A GB911588A GB 911588 A GB911588 A GB 911588A GB 41005/60 A GB41005/60 A GB 41005/60A GB 4100560 A GB4100560 A GB 4100560A GB 911588 A GB911588 A GB 911588A
Authority
GB
United Kingdom
Prior art keywords
intermediate member
piston
hydro
bell
pneumatic
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
GB41005/60A
Inventor
Kalman Domokos
Karoly Barsi
Laszlo Mezo
Rudolf Monos
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.)
Nikex Nehezipari Kulkereskedelmi Vallalat
Original Assignee
Nikex Nehezipari Kulkereskedelmi Vallalat
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
Priority to FR844673A priority Critical patent/FR1280693A/en
Application filed by Nikex Nehezipari Kulkereskedelmi Vallalat filed Critical Nikex Nehezipari Kulkereskedelmi Vallalat
Priority to GB41005/60A priority patent/GB911588A/en
Publication of GB911588A publication Critical patent/GB911588A/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
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves

Abstract

911,588. Hydro-pneumatic pit props. NIKEX NEHEZIPARI KULKERESKEDELMI VALLALAT. Nov. 29, 1960, No. 41005/60. Class 20 (2). A hydro-pneumatic pit prop comprises a base 1 for liquid, a working cylinder 4 connected thereto by an intermediate member 3 and an inner tubular member, see Fig. 1 (not shown) which is slidable in said cylinder and carries a head plate and a bell-shaped rubber piston, said intermediate member having ports 12, 15 for establishing communication between the bell-shaped piston and a conduit 13 carried by the intermediate member and extending into the base. A normally operable control valve 16-21 incorporating automatic safety relief means is mounted in the intermediate member 3 and is adapted to be connected to a source of compressed air to feed liquid from the bore 1 through the ports 12, 15 to the underside of the piston until the prop head engages the main roof at the desired pressure whereupon the pressure hose is disconnected and a closure cap fitted.
GB41005/60A 1960-11-29 1960-11-29 Improvements in or relating to hydropneumatic pit props Expired GB911588A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR844673A FR1280693A (en) 1960-11-29 1960-11-22 hydropneumatic mine prop
GB41005/60A GB911588A (en) 1960-11-29 1960-11-29 Improvements in or relating to hydropneumatic pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB41005/60A GB911588A (en) 1960-11-29 1960-11-29 Improvements in or relating to hydropneumatic pit props

Publications (1)

Publication Number Publication Date
GB911588A true GB911588A (en) 1962-11-28

Family

ID=10417654

Family Applications (1)

Application Number Title Priority Date Filing Date
GB41005/60A Expired GB911588A (en) 1960-11-29 1960-11-29 Improvements in or relating to hydropneumatic pit props

Country Status (2)

Country Link
FR (1) FR1280693A (en)
GB (1) GB911588A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2300894A1 (en) * 1975-02-12 1976-09-10 Bennes Marrel Shock absorber for sledge mounted mine roof support - is membrane pressure accumulator housed inside piston of actuator strut

Also Published As

Publication number Publication date
FR1280693A (en) 1962-01-08

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