Bohrwerkzeug.

摘要

A drilling tool comprises a holder unit (A) adapted to be detachably mounted to a hand-held drive unit, and a hole saw unit (B; B1, B2) detachably mounted to the holder unit (A), the hole saw unit (B; B1, B2) including, as a unit, a cylindrical cutter (10) and a center pin (11), the holder unit (A) including, as a unit, a spring (6) and a slider (5) disposed to allow reciprocating motion of the center pin (11), whereby the drilling tool is able to constantly form an appropriate hole in a workpiece such as a thin iron plate, a thick iron plate, or a pipe having a round surface, and expendable components of the drilling tool are formed as a unit to allow for ready replacement.