ELECTRIC DRILL WITH PRESSURE BOOSTING TOOL

摘要

PURPOSE: To prevent the reverse rotation of an electric drill itself caused by the rotation stop of the drill generated by the increase in cutting resistance at the time of opening a hole in firmly jointed channel steel and equilateral angle steel by the electric drill. ;CONSTITUTION: A lever 2 that can oscillate is fitted to an electric drill 12, and a chain 4 is provided to tension-connect the short shank 2b of the lever 2 to machined material 11. In the state of the tip of the electric drill 12 being brought into contact with the machined surface, a current is applied, and the end of the long shank 2a of the lever 2 is then pressed in a direction P. Pressing force intensified by several times is thereby applied to the drill by the principle of the lever.;COPYRIGHT: (C)1996,JPO