GB865442A - Improvements in or relating to pit props - Google Patents
Improvements in or relating to pit propsInfo
- Publication number
- GB865442A GB865442A GB2041457A GB2041457A GB865442A GB 865442 A GB865442 A GB 865442A GB 2041457 A GB2041457 A GB 2041457A GB 2041457 A GB2041457 A GB 2041457A GB 865442 A GB865442 A GB 865442A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- fluid
- wedges
- cushion
- engages
- 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 6
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
- E21D15/58—Devices for setting props or chocks
- E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
- E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded
- E21D15/588—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded the lock also being activated
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
865,442. Pit props. MASCHINENFABRIK E. BELLMANN G.m.b.H. June 28, 1957, No. 20414/57. Class 20(2) A telescopic pit prop comprises an inner top part 2 supported by a fluid cushion 4 on a conical member 3a which is adapted to move longitudinally of the prop and press wedges 36 radially outwardly against the interior of the outer prop part 1. The prop is released by supplying fluid by means of an aperture 10a in the prop part 2 to force down a piston 6, open a valve 5 and release fluid from the cushion chamber 4a to the interior of the prop part 2 whereupon the inner prop part 2 falls and the lower edge of the cushion chamber 4a engages and releases the wedges 3b, and the prop collapses. To set the prop, fluid is first supplied by an aperture 7a into the inner prop part 2 to force fluid back into the cushion chamber 4a through the valve 5. Fluid is then supplied by means of an aperture 11a in the prop part 1 to raise a piston 9 which engages a bolt 8 on the member 3a to hold the cone and wedges released and then to raise them and the inner prop part 2 until the head 10 engages the mine roof, the pressure of which operates the cone and wedges through the prop part 2 and cushion 4 to lock the prop.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2041457A GB865442A (en) | 1957-06-28 | 1957-06-28 | Improvements in or relating to pit props |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2041457A GB865442A (en) | 1957-06-28 | 1957-06-28 | Improvements in or relating to pit props |
Publications (1)
Publication Number | Publication Date |
---|---|
GB865442A true GB865442A (en) | 1961-04-19 |
Family
ID=10145555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2041457A Expired GB865442A (en) | 1957-06-28 | 1957-06-28 | Improvements in or relating to pit props |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB865442A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2200402B (en) * | 1987-01-16 | 1990-12-05 | Roberts Consolidated Ind | Device |
-
1957
- 1957-06-28 GB GB2041457A patent/GB865442A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2200402B (en) * | 1987-01-16 | 1990-12-05 | Roberts Consolidated Ind | Device |
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