GB839211A - Mine roof bars - Google Patents
Mine roof barsInfo
- Publication number
- GB839211A GB839211A GB16365/57A GB1636557A GB839211A GB 839211 A GB839211 A GB 839211A GB 16365/57 A GB16365/57 A GB 16365/57A GB 1636557 A GB1636557 A GB 1636557A GB 839211 A GB839211 A GB 839211A
- Authority
- GB
- United Kingdom
- Prior art keywords
- block
- tongue
- bar
- pivot
- slots
- 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
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
- E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
839,211. Mine roof supports. PROGRES CHARBONNIER PROCHER SOC. COOPERATIVE. May 23, 1957 [July 14, 1956], No. 16365/57. Class 20(2) A mine roof bar as a fork end comprising limbs 5 in which are bores 6 for a pivot pin and slots 8 for a hoisting wedge, which latter contain a movable block 11. Bars are coupled end to end by inserting the tongue end of one bar between the limbs 5 of another and inserting a pivot pin through the bores 6 and aligned bore in the tongue. Whichever side of the bar is uppermost the block 11 drops to the lower ends of its slots 8 so that insertion of a 'hoisting wedge in the slots 8 causes the one bar to pivot around the pin and be clamped against the roof. Alternatively, the block may slide in a slot in the tongue (Fig. 1, not shown) or pivot in an open slot at the end of the tongue (Fig. 5, not shown). The working faces of the block may be machined and the sides be correspondingly shaped. The block may be held in place by a spring loaded ball or bolt or by magnetization. The slot may be rectangular or curved about a radius centering on the pivot.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE839211X | 1956-07-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB839211A true GB839211A (en) | 1960-06-29 |
Family
ID=3881909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16365/57A Expired GB839211A (en) | 1956-07-14 | 1957-05-23 | Mine roof bars |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE549548A (en) |
FR (1) | FR1175518A (en) |
GB (1) | GB839211A (en) |
-
0
- BE BE549548D patent/BE549548A/xx unknown
-
1957
- 1957-05-20 FR FR1175518D patent/FR1175518A/en not_active Expired
- 1957-05-23 GB GB16365/57A patent/GB839211A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1175518A (en) | 1959-03-27 |
BE549548A (en) |
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