OA00401A - Telescopic extension system with hydraulic lift for supporting elements in size. - Google Patents
Telescopic extension system with hydraulic lift for supporting elements in size.Info
- Publication number
- OA00401A OA00401A OA50478A OA50478A OA00401A OA 00401 A OA00401 A OA 00401A OA 50478 A OA50478 A OA 50478A OA 50478 A OA50478 A OA 50478A OA 00401 A OA00401 A OA 00401A
- Authority
- OA
- OAPI
- Prior art keywords
- size
- supporting elements
- hydraulic lift
- extension system
- telescopic extension
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
- E21D17/082—Cap joints for obtaining a coal-face free of pit-props of sliding type
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/0206—Hydraulically operated extension devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
- E21D23/063—Retractable cantilever extensions therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Safety Valves (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR868738A FR1303511A (en) | 1961-07-22 | 1961-07-22 | Telescopic extension system with hydraulic lift for supporting elements in size |
Publications (1)
Publication Number | Publication Date |
---|---|
OA00401A true OA00401A (en) | 1966-05-15 |
Family
ID=8759869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
OA50478A OA00401A (en) | 1961-07-22 | 1964-10-23 | Telescopic extension system with hydraulic lift for supporting elements in size. |
Country Status (6)
Country | Link |
---|---|
US (1) | US3240021A (en) |
BE (1) | BE618721A (en) |
FR (1) | FR1303511A (en) |
GB (1) | GB981568A (en) |
LU (1) | LU41944A1 (en) |
OA (1) | OA00401A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290506B (en) * | 1962-11-10 | 1969-03-13 | Groetschel Karl Maria | Traveling extension unit |
LU44403A1 (en) * | 1963-09-09 | 1963-11-09 | ||
GB1045353A (en) * | 1964-02-12 | 1966-10-12 | Gullick Ltd | Improvements in or relating to mine roof supports |
HU167711B (en) * | 1973-12-07 | 1975-12-25 | ||
GB1583647A (en) * | 1976-09-24 | 1981-01-28 | Huwood Ltd | Mine roof supports |
US4480946A (en) * | 1981-10-19 | 1984-11-06 | Kelley Jay H | Gob canopy for a mine roof support |
DE3221486A1 (en) * | 1982-06-07 | 1983-12-08 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Forepoling device for hydraulic self-advancing powered support assemblies |
GB2123885B (en) * | 1982-07-09 | 1986-02-19 | Dowty Mining Equipment Ltd | Roof support for use in mines |
US4483644A (en) * | 1982-09-15 | 1984-11-20 | Johnson Thomas P | Cantilevered mobile marine rig with hydraulic load equalizer |
US4565263A (en) * | 1985-06-10 | 1986-01-21 | Southworth Ted J | Sawhorse with extendible and contractible leg assemblies |
GB2196371B (en) * | 1986-10-15 | 1990-05-09 | Gullick Dobson Ltd | Mine roof supports |
CN102305090A (en) * | 2011-09-29 | 2012-01-04 | 郑州四维机电设备制造有限公司 | Telescopic girder mechanism |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1182188B (en) * | 1956-06-05 | 1964-11-26 | Hoesch Ag | Vorpfaendeinrichtung |
FR1192849A (en) * | 1957-04-20 | 1959-10-28 | Hoesch Werke Ag | Support extension |
GB881364A (en) * | 1959-01-16 | 1961-11-01 | Gullick Ltd | Improvements in or relating to hydraulic ram devices, particularly applicable to mine roof supports |
DE1077618B (en) * | 1959-04-16 | 1960-03-17 | Hermann Schwarz Kommanditgesel | Flexible stretch support |
US3127748A (en) * | 1960-05-10 | 1964-04-07 | Gullick Ltd | Mine roof supports |
-
1961
- 1961-07-22 FR FR868738A patent/FR1303511A/en not_active Expired
-
1962
- 1962-06-08 BE BE618721A patent/BE618721A/en unknown
- 1962-06-26 LU LU41944D patent/LU41944A1/xx unknown
- 1962-07-06 GB GB25992/62A patent/GB981568A/en not_active Expired
- 1962-07-20 US US211344A patent/US3240021A/en not_active Expired - Lifetime
-
1964
- 1964-10-23 OA OA50478A patent/OA00401A/en unknown
Also Published As
Publication number | Publication date |
---|---|
BE618721A (en) | 1962-10-01 |
LU41944A1 (en) | 1962-08-27 |
US3240021A (en) | 1966-03-15 |
FR1303511A (en) | 1962-09-14 |
GB981568A (en) | 1965-01-27 |
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