Stemming Plug
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United States of America Patent
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Issued Date -
Jul 24, 2008
app pub date -
Oct 6, 2005
filing date -
Oct 12, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a stemming plug (10) which is made from a suitably resilient plastic material and comprises two cup-shaped members (12,14) which face each other with their rims (22) in abutment and means, which extends between the centres of the base portions of the cups (20) in the plug (10), which is adapted to move the bases of the cups (20) towards each other to compress the cups (10) and cause a circumferential zone of the plug (10) on either side of the abutting faces of the cups (20) to increase in radial dimension to be brought into load bearing contact with the side of a predrilled hole (38) in which the plug (10) is to be located, in use, and to enable the bases of the cups (20) to be moved away from each other to allow the plug (10) to be withdrawn from the hole (38) in the event of a misfire of the explosive in the hole (38).
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