GB1464871A - Hydraulic roof support - Google Patents
Hydraulic roof supportInfo
- Publication number
- GB1464871A GB1464871A GB1922373A GB1922373A GB1464871A GB 1464871 A GB1464871 A GB 1464871A GB 1922373 A GB1922373 A GB 1922373A GB 1922373 A GB1922373 A GB 1922373A GB 1464871 A GB1464871 A GB 1464871A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve unit
- pivot
- roof
- roof beam
- underside
- 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 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)
- Pivots And Pivotal Connections (AREA)
Abstract
1464871 Mine roof supports DOWTY MINING EQUIPMENT Ltd 2 May 1974 [24 April 1973] 19223/73 Heading E1P In a mine roof support comprising a floor beam, a roof beam and a plurality of hydraulic jacks therebetween a valve unit is mounted on the underside of the roof beam to only pivot about axles 8, 9 whereby forces exerted by manual operation of the valve means produce little or no turning moment of the valve unit about the pivot axis. The axle 8 bears in a V-shaped bracket 6 and the pivot axle 9 is received in a member 22 secured to the underside of a bracket 7 the arrangement being that the valve unit is capable of angular movement relative to the roof beam about an axis parallel to the direction of advance of the support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1922373A GB1464871A (en) | 1974-05-02 | 1974-05-02 | Hydraulic roof support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1922373A GB1464871A (en) | 1974-05-02 | 1974-05-02 | Hydraulic roof support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1464871A true GB1464871A (en) | 1977-02-16 |
Family
ID=10125783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1922373A Expired GB1464871A (en) | 1974-05-02 | 1974-05-02 | Hydraulic roof support |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1464871A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2363693A1 (en) * | 1976-09-07 | 1978-03-31 | Hemscheidt Maschf Hermann | MULTIPLE CONTROL UNIT FOR HYDRAULIC WALKING SUPPORT |
| CN100371559C (en) * | 2004-12-10 | 2008-02-27 | 兖州煤业股份有限公司 | Hydraulic supporter for end of widening working face |
-
1974
- 1974-05-02 GB GB1922373A patent/GB1464871A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2363693A1 (en) * | 1976-09-07 | 1978-03-31 | Hemscheidt Maschf Hermann | MULTIPLE CONTROL UNIT FOR HYDRAULIC WALKING SUPPORT |
| CN100371559C (en) * | 2004-12-10 | 2008-02-27 | 兖州煤业股份有限公司 | Hydraulic supporter for end of widening working face |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |