GB747251A - An improved hydraulic pit-prop - Google Patents
An improved hydraulic pit-propInfo
- Publication number
- GB747251A GB747251A GB30476/51A GB3047651A GB747251A GB 747251 A GB747251 A GB 747251A GB 30476/51 A GB30476/51 A GB 30476/51A GB 3047651 A GB3047651 A GB 3047651A GB 747251 A GB747251 A GB 747251A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- valve
- chamber
- inner member
- ges
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/515—Particular fluids not covered by any chemical subdivision
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
- E21D15/30—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber
- E21D15/306—Telescopic props with parts held relatively to each other by friction or gripping by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber by means of a liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
747,251. Pit props. GUTEHOFFNUNGSHUTTE STERKRADE AKT.-GES. [formerly GUTEHOFFNUNGSHUTTE OBERHAUSEN AKT.-GES.]..Dec. 31, 1951 [Jan. 9, 1951], No. 30476/51. Class 20(2). A hydraulic telescopic pit prop supports the mine roof by means of fluid in chamber 27 beneath the upper inner member 1 and also by means of a friction lining 4 on a resilient cup 5 forming an extension of the inner member and forced against the interior of the outer member 2 by the pressure in the chamber 27 which is supplied from chamber 28 in the inner member. The communication between chambers 27, 28 is controlled by valve 7, 9 operated by a rod 11 and an eccentric 21. The prop is set by wedge 23 and movable head 22. The ball valves 9 operated by a cone 18 on the rod 11 before valve 7 is opened make a preliminary connection between chambers 27, 28. A relief valve 8 is provided in the valve 7. In a modification the friction lining is forced outward by segments the top of which are engaged by the coned bottom of the inner prop member. The outer prop member may be protected by a covering of rubber tube part of which is shown at 25.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE747251X | 1951-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB747251A true GB747251A (en) | 1956-03-28 |
Family
ID=6648590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30476/51A Expired GB747251A (en) | 1951-01-09 | 1951-12-31 | An improved hydraulic pit-prop |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE507997A (en) |
FR (1) | FR1060827A (en) |
GB (1) | GB747251A (en) |
NL (1) | NL166402B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2938699A (en) * | 1953-01-15 | 1960-05-31 | Bellmann Emma Elfriede | Prop-type supporting devices |
US2928643A (en) * | 1953-02-21 | 1960-03-15 | Bellmann Eugen | Prop-type supporting device |
-
0
- BE BE507997D patent/BE507997A/xx unknown
- NL NL7016353.A patent/NL166402B/en unknown
-
1951
- 1951-12-31 GB GB30476/51A patent/GB747251A/en not_active Expired
-
1952
- 1952-01-09 FR FR1060827D patent/FR1060827A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL166402B (en) | |
BE507997A (en) | |
FR1060827A (en) | 1954-04-06 |
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