Patent ID: 7322429
Filing Date: 2008-01-29
Classification: B23B,B23Q,Y10T

Abstract:
1. A portable drilling machine comprising: a housing; a drill chuck positioned on a front surface of the housing; a drill bit detachably coupled to the drill chuck; a driver positioned inside the housing to provide either the drill bit or the drill chuck with a rotational driving force; an anti-dust cover having a rear anti-dust cover formed in a cup shape with a drill through-hole formed in a central region of a bottom surface of the rear anti-dust cover and a front anti-dust cover formed in a tube shape to be coupled to the rear anti-dust cover, the front anti-dust cover being adapted to move towards the bottom surface of the rear anti-dust cover when acted on by pressure towards the housing and return to original position when the pressure is removed, wherein the front anti-dust cover is formed as a corrugated tube adapted to retract towards the bottom surface of the rear anti-dust cover when acted on by pressure towards the housing and extend to original position when the pressure is removed; and a retainer for detachably coupling the rear anti-dust cover to an outer surface of either the housing or the drill chuck, wherein the rear anti-dust cover has a pair of retaining posts formed on a peripheral wall of the rear anti-dust cover while facing each other and a linear retaining slot defined between the retaining posts in a longitudinal direction of the rear anti-dust cover, the front anti-dust cover being coupled to the rear anti-dust cover by a fastener inserted into the retaining slot.