FIELD: drilling.
SUBSTANCE: device has the drill bit provided with two cutting edges, cylindrical housing with threaded shanks for mounting the drill rod, and piping insert for receiving grinded ground. The bit has smooth inner side made of a truncated cone with an orifice for forming the column of ground. The diameter of the orifice is less than the internal diameter of the piping insert by 2-3 mm. The piping insert is made of a thin polyethylene pipe and is mounted inside the housing with a spaced relation over periphery.
EFFECT: enhanced convenience and simplified servicing.
2 dwg
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