GB1079789A - Improvements in or relating to hydraulically operated mine roof supports - Google Patents
Improvements in or relating to hydraulically operated mine roof supportsInfo
- Publication number
- GB1079789A GB1079789A GB5323765A GB5323765A GB1079789A GB 1079789 A GB1079789 A GB 1079789A GB 5323765 A GB5323765 A GB 5323765A GB 5323765 A GB5323765 A GB 5323765A GB 1079789 A GB1079789 A GB 1079789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mine roof
- relating
- hydraulically operated
- roof supports
- operated mine
- 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
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
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)
- Actuator (AREA)
Abstract
1,079,789. Hydraulic pit props. ELECTROHYDRAULICS Ltd. Dec. 15, 1965 [July 14, 1965], No. 53237/65. Addition to 977800. Heading E1E. In a modification of the mine roof support claimed in Claim 3 of Specification 977800 means, such as a restricted orifice 18, are provided to produce a pressure drop across the second piston member 2a during extension of the support whereby the second cylinder 2 extends before or concurrently with the first cylinders. The means may comprise valve means or be constituted by a restriction orifice or orifices disposed other than on the member 2a for details of which minor modifications the Specification should be referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47190265A | 1965-07-14 | 1965-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1079789A true GB1079789A (en) | 1967-08-16 |
Family
ID=23873436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5323765A Expired GB1079789A (en) | 1965-07-14 | 1965-12-15 | Improvements in or relating to hydraulically operated mine roof supports |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1079789A (en) |
-
1965
- 1965-12-15 GB GB5323765A patent/GB1079789A/en not_active Expired
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