Hollow drilling system for boring holes in brick-work or concrete, has exhaust, hollow drill with driving axle, which can be withdrawn from suction system without use of tools

摘要

Hollow drilling system, has an exhaust, a hollow drill (16) with a driving axle (4) can be withdrawn from the suction system without the use of tools. The driving axle is installed into hollow drill and has a through-hole, which serves for driving drill core residue by means of an output drive pins and for receiving the centering drilling holder (12).