Drilling unit with hollow annular drill bit and central drill

Details Drilling unit with hollow annular drill bit and central drill Drilling unit with hollow annular drill bit and central drill

B - Operations, Transporting

28

D

B28D 1/14 (2006.01) B23B 31/113 (2006.01) B23B 51/04 (2006.01) B28D 1/26 (2006.01)

Patent

CA 2160043

A drilling unit is formed of a hollow annular drill bit and a centering drill where the centering drill is a single piece including a chucking shank and a drill head. A detachable connection is provided between the annular drill bit and the centering drill, preferably in the form of a thread whereby the drilling unit can be provided with different diameter annular drill bits and can be adapted to different applications as well as to different power tools presently in use.

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