Patent ID: 7316209
Filing Date: 2008-01-08
Classification: B25C

Abstract:
1. A combustion-type power tool comprising: a housing; a cylinder disposed in the housing; a piston disposed in the cylinder and movable in an axial direction; a cylinder head disposed at an end of the housing and having a wall portion extending in a direction perpendicular to the axial direction, the wall portion having an opening; a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body into a combustion chamber through the opening of the wall portion of the cylinder head; a fan connected to the drive shaft to be rotatable within the combustion chamber; and an elastic member disposed at the opening of the wall portion and having a sleeve portion extending in the axial direction, the sleeve portion having a through-hole through which the drive shaft extends; wherein an inner surface of the through-hole is tapered with respect to an outer surface of the drive shaft.