FR978701A - forestay or prop - Google Patents

forestay or prop

Info

Publication number
FR978701A
FR978701A FR978701DA FR978701A FR 978701 A FR978701 A FR 978701A FR 978701D A FR978701D A FR 978701DA FR 978701 A FR978701 A FR 978701A
Authority
FR
France
Prior art keywords
forestay
prop
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
Other languages
French (fr)
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.)
Dowty Equipment Ltd
Original Assignee
Dowty Equipment 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
Priority claimed from GB92548A external-priority patent/GB636568A/en
Application filed by Dowty Equipment Ltd filed Critical Dowty Equipment Ltd
Application granted granted Critical
Publication of FR978701A publication Critical patent/FR978701A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/60—Devices for withdrawing props or chocks
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK 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
    • E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators

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)
  • Safety Valves (AREA)
  • Control Of Presses (AREA)
FR978701D 1948-01-12 1949-04-05 forestay or prop Expired FR978701A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB92548A GB636568A (en) 1953-07-20 1948-01-12 Improvements in pit props and other telescopic struts
GB2011253A GB726384A (en) 1953-07-20 1953-07-20 Improvements in pit props and other telescopic struts

Publications (1)

Publication Number Publication Date
FR978701A true FR978701A (en) 1951-04-17

Family

ID=32299627

Family Applications (2)

Application Number Title Priority Date Filing Date
FR978701D Expired FR978701A (en) 1948-01-12 1949-04-05 forestay or prop
FR69104D Expired FR69104E (en) 1948-01-12 1954-07-20 forestay or prop

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR69104D Expired FR69104E (en) 1948-01-12 1954-07-20 forestay or prop

Country Status (5)

Country Link
US (1) US2621631A (en)
BE (1) BE486663A (en)
DE (1) DE808225C (en)
FR (2) FR978701A (en)
NL (1) NL76043C (en)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899976A (en) * 1959-08-18 Release relief valve
DE1072941B (en) * 1960-01-14 -Ing H Joe Rheinbay Marienheide Dipl (RhId) Hydraulically operated pit ram equipped with a floating piston that is acted upon by atmospheric or compressed air pressure
GB700790A (en) * 1951-07-19 1953-12-09 Dowty Auto Units Ltd Improvements relating to valves
US2888231A (en) * 1952-05-27 1959-05-26 Mining Engineering Co Ltd Roof supports
US2888230A (en) * 1952-06-16 1959-05-26 Mining Engineering Co Ltd Roof supports
GB746862A (en) * 1953-09-04 1956-03-21 Dowty Hydraulic Units Ltd Improvements in hydraulic pit props
NL92057C (en) * 1953-09-24 1900-01-01
GB767012A (en) * 1953-11-12 1957-01-30 Coal Industry Patents Ltd Improvements in or relating to pit or like props
BE548513A (en) * 1955-06-10
DE1131625B (en) * 1955-08-13 1962-06-20 Kronprinz Ag Hydraulic pit ram
BE552440A (en) * 1955-12-13
DE1062654B (en) * 1956-04-03 1959-08-06 Kloeckner Bergbau Viktor Icker Hydraulic pit ram
DE1081848B (en) * 1956-06-28 1960-05-19 Becorit Grubenausbau Gmbh Hydraulic pit ram
GB837916A (en) * 1957-01-31 1960-06-15 Dowty Mining Equipment Ltd Improvements relating to telescopic tubular pit props
DE1108157B (en) * 1957-02-11 1961-06-08 Hermann Schwarz K G Pressure medium space for elements of the pit lining
GB894292A (en) * 1957-07-30 1962-04-18 Mastabar Mining Equip Co Ltd Improvements in or relating to hydraulic props, particularly pit props
DE1061273B (en) * 1958-01-13 1959-07-16 Kloeckner Bergbau Victor Icker Hydraulic pit ram
GB862033A (en) * 1958-10-29 1961-03-01 Mastabar Mining Equip Co Ltd Improvements in or relating to extensible hydraulic supports
NL233516A (en) * 1958-11-24 1965-06-25
US2996888A (en) * 1959-01-26 1961-08-22 Raymond Int Inc Hydraulic pile puller
NL248713A (en) * 1959-02-23
GB962542A (en) * 1959-08-21 1964-07-01 Acrow Eng Ltd Improvements in and relating to hydraulic props
US3134398A (en) * 1960-06-17 1964-05-26 Acrow Eng Ltd Hydraulic prop valve
DE1137406B (en) * 1960-06-30 1962-10-04 Kronprinz Ag Hydraulic pit ram
FR1280684A (en) * 1960-11-22 1962-01-08 Sagem hydraulic prop
GB954676A (en) * 1960-12-22 1964-04-08 Dowty Mining Equipment Ltd Telescopic hydraulic props
DE1215635B (en) * 1963-11-29 1966-05-05 Rheinstahl Gmbh Wanheim Friction stamp with hydraulic setting and clamping device
GB1080831A (en) * 1964-01-17 1967-08-23 Soc Anglo Belge Vulcain Sa Nuclear reactor control mechanism
DE2603978C3 (en) * 1976-02-03 1982-10-14 Thyssen Industrie Ag, 4300 Essen Rock impact valve arrangement in a hydraulic pit ram
US4237769A (en) * 1978-04-03 1980-12-09 Commercial Shearing, Inc. Relief valves and mine props incorporating the same
ZA785167B (en) * 1978-09-12 1979-08-29 Bochumer Eisen Heintzmann A hydraulic mine prop
DE8808519U1 (en) * 1988-07-04 1989-11-02 Heiliger, Martha-Catharina, 5166 Kreuzau Hydraulic steel pit ram
DE9005343U1 (en) * 1990-05-11 1990-08-30 Heiliger, Robert Wilhelm, 5166 Kreuzau Hydraulic steel pit ram
DE4140317C2 (en) * 1991-12-06 1995-03-23 Vos Richard Grubenausbau Gmbh Valve arrangement for single punch expansion in underground mining and tunneling
DE69417023T2 (en) * 1993-05-07 1999-11-18 Dorbyl Ltd., Bedfordview PIT STAMP
DE4323462C2 (en) * 1993-07-14 1995-05-04 Vos Richard Grubenausbau Gmbh Removal stamp for underground use with integrated pressure relief valve
US20120148350A1 (en) * 2010-12-10 2012-06-14 Kenneth Poulson Mine prop jack and method of prestressing a mine prop
CN106499421B (en) * 2016-11-03 2019-01-08 中国矿业大学 A kind of mechanical constant-resistance individual prop withdrawing technique and recovery method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US151670A (en) * 1874-06-02 Improvement in hydraulic lifting-jacks
US1133270A (en) * 1913-05-03 1915-03-30 Charles E Dale Pump appliance.
US1598426A (en) * 1925-07-03 1926-08-31 Ingersoll Rand Co Shank and bit punch
US1805588A (en) * 1926-01-05 1931-05-19 Manley Mfg Company Hydraulic jack
US1706309A (en) * 1927-02-04 1929-03-19 May Sumner Hydraulic and other fluid pressure lifting jack
US2284228A (en) * 1940-03-18 1942-05-26 Herbert E Page Pressure multiplying mechanism

Also Published As

Publication number Publication date
DE808225C (en) 1951-07-12
NL76043C (en) 1954-05-15
BE486663A (en)
FR69104E (en) 1958-10-01
US2621631A (en) 1952-12-16

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