Breaking up of rock and the like
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Dec 12, 1994
filing date -
Dec 14, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
An impulse generating tool for breaking up rock has a barrel, a breech body for a cartridge (50) loaded with gas producing propellant (70) and a firing mechanism for firing the cartridge. A hole is drilled in the rock and filled with water. The barrel is passed down the hole and the cartridge is fired. Shockwaves break up the rock. A firing pin (42) of the firing mechanism is off-set (56) from a centreline (54) of the breech body, and the cartridge, which is of a shotgun type, has a rim-fire percussion cap (63) complemental to the off-set of the firing pin. Conventional shotgun ammunition cannot be fired with the tool, and cartridges for the tool cannot be fired by a conventional shotgun.
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