GB372567A - Improvements in pit props - Google Patents
Improvements in pit propsInfo
- Publication number
- GB372567A GB372567A GB1485831A GB1485831A GB372567A GB 372567 A GB372567 A GB 372567A GB 1485831 A GB1485831 A GB 1485831A GB 1485831 A GB1485831 A GB 1485831A GB 372567 A GB372567 A GB 372567A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- wedge
- length
- pit props
- pit
- 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 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
- E21D15/50—Component parts or details of props
- E21D15/52—Extensible units located above or below standard 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)
- Supports For Plants (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
372,567. Wedges. BEGG, A. L., Seaforth House, and MURDOCH, J., Laneview, both in New Cumnock, Ayrshire. May 20, 1931, No. 14858. [Class 89 (ii).] A wedge for use in adjusting the length of a telescopic pit prop is provided with a barbed end 31 to prevent disengagement of the wedge from the prop, the barb being of greater length than the guide slot 4 in the prop which limits the extreme adjustment allowable between the prop members.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1485831A GB372567A (en) | 1931-05-20 | 1931-05-20 | Improvements in pit props |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1485831A GB372567A (en) | 1931-05-20 | 1931-05-20 | Improvements in pit props |
Publications (1)
Publication Number | Publication Date |
---|---|
GB372567A true GB372567A (en) | 1932-05-12 |
Family
ID=10048729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1485831A Expired GB372567A (en) | 1931-05-20 | 1931-05-20 | Improvements in pit props |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB372567A (en) |
-
1931
- 1931-05-20 GB GB1485831A patent/GB372567A/en not_active Expired
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