FR978701A - forestay or prop - Google Patents
forestay or propInfo
- 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
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)
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)
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)
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 |
-
0
- BE BE486663D patent/BE486663A/xx unknown
-
1948
- 1948-11-08 US US58949A patent/US2621631A/en not_active Expired - Lifetime
- 1948-12-15 NL NL143867A patent/NL76043C/xx active
- 1948-12-20 DE DEP25763A patent/DE808225C/en not_active Expired
-
1949
- 1949-04-05 FR FR978701D patent/FR978701A/en not_active Expired
-
1954
- 1954-07-20 FR FR69104D patent/FR69104E/en not_active Expired
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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