GB1030574A - Improvements in or relating to hydraulic props - Google Patents
Improvements in or relating to hydraulic propsInfo
- Publication number
- GB1030574A GB1030574A GB29288/62A GB2928862A GB1030574A GB 1030574 A GB1030574 A GB 1030574A GB 29288/62 A GB29288/62 A GB 29288/62A GB 2928862 A GB2928862 A GB 2928862A GB 1030574 A GB1030574 A GB 1030574A
- Authority
- GB
- United Kingdom
- Prior art keywords
- axle
- ram
- chamber
- air
- plunger
- 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
- 230000037431 insertion Effects 0.000 abstract 2
- 238000003780 insertion Methods 0.000 abstract 2
- 230000000881 depressing effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
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
- E21D15/14—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)
- Details Of Reciprocating Pumps (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
1,030,574. Hydraulic pit props. W. E. & F. DOBSON Ltd. July 1, 1963 [July 31, 1962], No. 29288/62. Heading E1E. In an hydraulic telescopic pit prop wherein the ram 7 forms a reservoir containing a pump 1 and release valve 2 actuated by a common crank axle 4 through a lost motion connection, the axle 4 rotates in a sleeve 18, Fig. 2, having an air outlet 19 which is closed by the axle when the prop is not in use. The axle 4 has a tranverse bore 4a for the insertion of a pump handle, such insertion depressing a plunger 23 to connect chamber 15, which is open to the ram interior, with an annular chamber 27. During pumping air is admitted around the plunger 23. When the handle is swung to the position for opening the release valve 2 a transverse passage (Figs. 3, 4, not shown) communicating with the chamber 27 in the axle 4 registers with the outlet 19 to allow free escape of the air in the ram.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL295875D NL295875A (en) | 1962-07-31 | ||
| BE634933D BE634933A (en) | 1962-07-31 | ||
| GB29288/62A GB1030574A (en) | 1962-07-31 | 1962-07-31 | Improvements in or relating to hydraulic props |
| US292274A US3180093A (en) | 1962-07-31 | 1963-07-02 | Hydraulic props |
| FR941758A FR1363676A (en) | 1962-07-31 | 1963-07-17 | Improvements relating to hydraulic props |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB29288/62A GB1030574A (en) | 1962-07-31 | 1962-07-31 | Improvements in or relating to hydraulic props |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1030574A true GB1030574A (en) | 1966-05-25 |
Family
ID=10289161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29288/62A Expired GB1030574A (en) | 1962-07-31 | 1962-07-31 | Improvements in or relating to hydraulic props |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3180093A (en) |
| BE (1) | BE634933A (en) |
| GB (1) | GB1030574A (en) |
| NL (1) | NL295875A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1086532A (en) * | 1964-01-18 | 1967-10-11 | Dobson Ltd W E & F | Improvements in and relating to hydraulic mine roof supports |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US686183A (en) * | 1899-05-22 | 1901-11-05 | Jay W Watkins | Fire-extinguisher. |
| US1212757A (en) * | 1914-11-05 | 1917-01-16 | Carl A Waldron | Hydraulic jack. |
| US1344919A (en) * | 1919-05-05 | 1920-06-29 | Alexander W Marr | Hydraulic jack |
| GB902188A (en) * | 1960-04-09 | 1962-07-25 | Mastabar Mining Equip Co Ltd | Improvements in or relating to hydraulic supports |
-
0
- NL NL295875D patent/NL295875A/xx unknown
- BE BE634933D patent/BE634933A/xx unknown
-
1962
- 1962-07-31 GB GB29288/62A patent/GB1030574A/en not_active Expired
-
1963
- 1963-07-02 US US292274A patent/US3180093A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| BE634933A (en) | |
| NL295875A (en) | |
| US3180093A (en) | 1965-04-27 |
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