GB1052405A - - Google Patents
Info
- Publication number
- GB1052405A GB1052405A GB2985063A GB2985063A GB1052405A GB 1052405 A GB1052405 A GB 1052405A GB 2985063 A GB2985063 A GB 2985063A GB 2985063 A GB2985063 A GB 2985063A GB 1052405 A GB1052405 A GB 1052405A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- july
- passages
- prop
- communication
- 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
- 239000012530 fluid Substances 0.000 abstract 2
- 230000002441 reversible effect Effects 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
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)
- Reciprocating Pumps (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
1,052,405. Hydraulic pit props. GEWERKSCHAFT EISENHUTTE WESTFALIA. July 26, 1963 [July 27, 1962], No. 29850/63. Heading E1E. An hydraulic pit prop having a working chamber 6 and an annular chamber 18 is provided with a unit 22 having a one way valve 11 and reversible pipe connection 16 in communication with the chamber 18 through passages 9 and 15, respectively. The arrangement is such that pressure fluid may be fed to the chamber 18 through the passage 13 in order to retract the prop whilst during expansion fluid is initially discharged therefrom via both passages 9, 15. When the piston is almost fully extended it establishes communication between the chamber 6 and the discharge passage 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG35569A DE1193460B (en) | 1962-07-27 | 1962-07-27 | Hydraulic pit ram |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1052405A true GB1052405A (en) | 1966-12-21 |
Family
ID=40996482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2985063A Expired GB1052405A (en) | 1962-07-27 | 1963-07-26 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE635501A (en) |
| DE (1) | DE1193460B (en) |
| FR (1) | FR1364512A (en) |
| GB (1) | GB1052405A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075931A (en) * | 1975-10-09 | 1978-02-28 | Caldwell Melvin R | Lift-jack fluid motor for hydraulic lift trucks |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE547272A (en) * | 1955-04-25 | |||
| GB774470A (en) * | 1955-11-19 | 1957-05-08 | Becorit Grubenausbau Gmbh | Improvements relating to hydraulic pit-props |
| BE558508A (en) * | 1956-06-21 | |||
| BE560243A (en) * | 1956-08-25 |
-
0
- BE BE635501D patent/BE635501A/xx unknown
-
1962
- 1962-07-27 DE DEG35569A patent/DE1193460B/en active Pending
-
1963
- 1963-07-26 FR FR942771A patent/FR1364512A/en not_active Expired
- 1963-07-26 GB GB2985063A patent/GB1052405A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075931A (en) * | 1975-10-09 | 1978-02-28 | Caldwell Melvin R | Lift-jack fluid motor for hydraulic lift trucks |
Also Published As
| Publication number | Publication date |
|---|---|
| BE635501A (en) | 1964-01-27 |
| FR1364512A (en) | 1964-06-19 |
| DE1193460B (en) | 1965-05-26 |
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