GB816702A - Improvements relating to hydraulic apparatus for mining machinery - Google Patents
Improvements relating to hydraulic apparatus for mining machineryInfo
- Publication number
- GB816702A GB816702A GB979155A GB979155A GB816702A GB 816702 A GB816702 A GB 816702A GB 979155 A GB979155 A GB 979155A GB 979155 A GB979155 A GB 979155A GB 816702 A GB816702 A GB 816702A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydraulic
- roof
- improvements relating
- mining machinery
- hydraulic apparatus
- 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
- 238000005065 mining Methods 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 abstract 1
Classifications
-
- 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
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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)
- Framework For Endless Conveyors (AREA)
Abstract
816,702. Mine roof supports. DOWTY MINING EQUIPMENT Ltd. April 5, 1956 [April 4, 1955], No. 9791/55. Drawings to Specification. Class 20(2) In a mine-roof supporting apparatus comprising hydraulic props between roof and floor bars and a hydraulic jack between the floor bar and a mobile structure such as a conveyer, for advancing the supporting apparatus and the conveyer alternately the supply and release of hydraulic fluid to and from the props is through the hollow piston rod and the cylinder chamber of the jack from and to pressure and release means. The subjectmatter of this Specification is described in Specification 823,127.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816702A true GB816702A (en) | 1959-07-15 |
Family
ID=1629981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB979155A Expired GB816702A (en) | 1955-04-04 | Improvements relating to hydraulic apparatus for mining machinery |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB816702A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241654A (en) * | 1962-10-10 | 1966-03-22 | Douglas H H Bolton | Mining apparatus with automatically advancing jacks |
| US3246730A (en) * | 1964-06-09 | 1966-04-19 | Dowty Mining Equipment Ltd | Mining apparatus comprising automatically advancing jacks |
| CN106194228A (en) * | 2016-07-22 | 2016-12-07 | 刘丹 | A kind of coal-mine hydraulic support of adjustable support point |
-
1955
- 1955-04-04 GB GB979155A patent/GB816702A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241654A (en) * | 1962-10-10 | 1966-03-22 | Douglas H H Bolton | Mining apparatus with automatically advancing jacks |
| US3246730A (en) * | 1964-06-09 | 1966-04-19 | Dowty Mining Equipment Ltd | Mining apparatus comprising automatically advancing jacks |
| CN106194228A (en) * | 2016-07-22 | 2016-12-07 | 刘丹 | A kind of coal-mine hydraulic support of adjustable support point |
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