| 摘要 |
A device used to break rock from within a predrilled borehole through the use of impact pins which strike against the interior sides of a drilled hole. The device is loaded into a drilled hole and then activated by a percussive hammer located above the hole, providing percussive energy to the device which is then transferred to the sidewall of the drilled hole. The device includes an inner piston assembly which includes a driving surface for causing impact pins to strike the interior sidewall of the drilled hole in a rapid percussive manner so as to greatly improve the ability to break and shatter surrounding rock or concrete.
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