GB636568A - Improvements in pit props and other telescopic struts - Google Patents
Improvements in pit props and other telescopic strutsInfo
- Publication number
- GB636568A GB636568A GB92548A GB92548A GB636568A GB 636568 A GB636568 A GB 636568A GB 92548 A GB92548 A GB 92548A GB 92548 A GB92548 A GB 92548A GB 636568 A GB636568 A GB 636568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ram
- cylinder
- blows
- valve
- prop
- 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 3
- 238000005086 pumping Methods 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
- E21D15/60—Devices for withdrawing props or chocks
-
- 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
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
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)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
636,568. Hydraulic pit-props. DOWTY, G. H. Jan. 12, 1948, No. 925. [Class 20 (ii)] [Also in Group XXX] A hydraulic pit-prop having a ram 1 which forms a reservoir for the actuating fluid, the ram being raised by pumping this fluid by a pump 8, into the cylinder 3, comprises a relief valve 20 which is contained in a casing 15 at the outer end of the ram 1 and controls the pressure in the cylinder 3 through a pipe 19 and is adapted to be unseated by a connection 25, 26, 27 and a link 30 in order to allow the prop to contract. The external control member 27 is protected from blows by an extension of the casing 15 and lost motion between the members 25, 26 prevents these blows being transmitted to the valve 20. A valve 31 admits air to the ram 1 as the actuating fluid is withdrawn. The pump 8 is operated by a crank 11.The cylinder 3 is protected from blows by an outer cylinder 37 or a rubber covering.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE486663D BE486663A (en) | 1948-01-12 | ||
US58949A US2621631A (en) | 1948-01-12 | 1948-11-08 | Telescopic hydraulic mine roof support |
NL143867A NL76043C (en) | 1948-01-12 | 1948-12-15 | |
DEP25763A DE808225C (en) | 1948-01-12 | 1948-12-20 | Pit stamp |
FR978701D FR978701A (en) | 1948-01-12 | 1949-04-05 | forestay or prop |
FR69104D FR69104E (en) | 1948-01-12 | 1954-07-20 | forestay or prop |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2011253A GB726384A (en) | 1953-07-20 | 1953-07-20 | Improvements in pit props and other telescopic struts |
Publications (1)
Publication Number | Publication Date |
---|---|
GB636568A true GB636568A (en) | 1950-05-03 |
Family
ID=10140587
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB92548A Expired GB636568A (en) | 1948-01-12 | 1948-01-12 | Improvements in pit props and other telescopic struts |
GB2011253A Expired GB726384A (en) | 1948-01-12 | 1953-07-20 | Improvements in pit props and other telescopic struts |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2011253A Expired GB726384A (en) | 1948-01-12 | 1953-07-20 | Improvements in pit props and other telescopic struts |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB636568A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2816728A (en) * | 1949-04-07 | 1957-12-17 | Lobbe Armin Dieter | Hydraulic pit props |
US2830563A (en) * | 1954-03-26 | 1958-04-15 | Burton B Burckhalter | Automatic jack leg |
US2857125A (en) * | 1953-02-25 | 1958-10-21 | Dowty Hydraulic Units Ltd | Mine roof supports |
CN112727481A (en) * | 2021-02-05 | 2021-04-30 | 中铁工程装备集团有限公司 | Excavation cabin direct discharge slurry shield machine and excavation cabin direct discharge slurry method |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE553227A (en) * | 1955-06-10 | |||
DE1171382B (en) * | 1960-02-23 | 1964-06-04 | H Joe Rheinbay Dipl Ing | Hydraulic pit ram |
DE1206830B (en) * | 1962-08-27 | 1965-12-16 | Bochumer Eisen Heintzmann | Hydraulic pit ram |
-
1948
- 1948-01-12 GB GB92548A patent/GB636568A/en not_active Expired
-
1953
- 1953-07-20 GB GB2011253A patent/GB726384A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2816728A (en) * | 1949-04-07 | 1957-12-17 | Lobbe Armin Dieter | Hydraulic pit props |
US2857125A (en) * | 1953-02-25 | 1958-10-21 | Dowty Hydraulic Units Ltd | Mine roof supports |
US2830563A (en) * | 1954-03-26 | 1958-04-15 | Burton B Burckhalter | Automatic jack leg |
CN112727481A (en) * | 2021-02-05 | 2021-04-30 | 中铁工程装备集团有限公司 | Excavation cabin direct discharge slurry shield machine and excavation cabin direct discharge slurry method |
Also Published As
Publication number | Publication date |
---|---|
GB726384A (en) | 1955-03-16 |
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