Small charge blasting apparatus including device for sealing pressurized fluids in holes
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United States of America Patent
Stats
-
Jan 22, 2002
Grant Date -
N/A
app pub date -
Apr 9, 1999
filing date -
Mar 11, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is directed to a small charge blasting system that provides a relief volume for a pressurized working fluid in the bore of a barrel that is inserted into a hole in the material to be broken, an end cap on the barrel to inhibit the entry of water and detritus into the bore, a stepped downhole end of the barrel to pressurize both the sidewall and bottom of the hole, and/or a thin barrel wall that flexes outwardly in response to pressure exerted on the wall by the pressurized working fluid to provide improved sealing of the fluid in the bottom of the hole.
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