IMPROVED STEMMING PLUGS

Eurasian Patent Organization Patent

PATENT NO 038962
APP PUB NO EA-201991222-A1
SERIAL NO

201991222

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Abstract

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A stemming plug (60) for stemming a blast hole in a mine is disclosed. The plug has first and second wedge-shaped members (62', 62) manufactured from a suitable plastics material. The first wedge-shaped member (62') has a first sloping face received in sliding relationship with a matching face of the second wedge-shaped member (62) wherein, in use, when the first wedge- shaped member (62') is positioned nearest to an explosive material in the blast hole it has a larger surface area facing the explosive material than the second wedge-shaped member (62). In use, when a Shockwave from initiation of the explosive material in the blast hole encounters the first wedge-shaped member (62') it acts as a piston, sliding on the second wedge- shaped member (62) so that both wedge-shaped members exert diametrically opposed forces against the wall of the blast hole to lock the plug (60) in place. The two wedge-shaped members (62', 62) may be substantially identical, thus significantly simplifying the manufacturing process.

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