GB700002A - Improvements in means for assembling supporting beams - Google Patents
Improvements in means for assembling supporting beamsInfo
- Publication number
- GB700002A GB700002A GB20126/49A GB2012649A GB700002A GB 700002 A GB700002 A GB 700002A GB 20126/49 A GB20126/49 A GB 20126/49A GB 2012649 A GB2012649 A GB 2012649A GB 700002 A GB700002 A GB 700002A
- Authority
- GB
- United Kingdom
- Prior art keywords
- roof
- key
- hooks
- pivot
- locked
- 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
- 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)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
Abstract
700,002. Mine roof supports. PROGRES CHARBONNIER PROCHAR SOC. COOPERATIVE. Aug. 2, 1949 [Jan. 31, 1949], No. 20126/49. Class 20 (2) A beam which forms part of a pit support and which is adapted to be pivotally attached at one end to one end of a similar beam supported against the roof of the working and which is then raised about the pivot and locked into position against the roof, comprises a beam formed by spaced longitudinals a, Figs. 1 and 2, between which are secured a jaw-forming end member b and a similar but bifurcated jaw-forming end member b<SP>1</SP> the members, b, b<SP>1</SP> having, respectively, holes c, c' and hooks d, d'. The bifurcated member b' of one beam is engaged with the member b of the adjacent beam and a pivot pin e is passed through the holes c, c<SP>1</SP>, the unsupported beam then being raised about the pivot e until it engages the roof in which position it is locked by a key f, Fig. 3, driven between the opposed hooks d, d<SP>1</SP>. The cheeks of the key and the co-operating faces of the hooks have the form of a helicoid or other ruled surface adapted to ensure contact over the entire extent of said surfaces whatever the relative angular positions of the beams and the degree of engagement of the key. Specification 652,701 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE700002X | 1949-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB700002A true GB700002A (en) | 1953-11-25 |
Family
ID=3878326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20126/49A Expired GB700002A (en) | 1949-01-31 | 1949-08-02 | Improvements in means for assembling supporting beams |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB700002A (en) |
-
1949
- 1949-08-02 GB GB20126/49A patent/GB700002A/en not_active Expired
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