Patent ID: 7387092

Claim:
A combustion-type power tool comprising: a housing; a cylinder disposed in the housing, the cylinder defining an axial direction; a cylinder head disposed at an end of the housing; a combustion chamber frame disposed in the housing and movable between a first position and a second position, the combustion chamber frame including a base section, a head section abuttable on the cylinder head to provide a combustion chamber when the combustion chamber frame is at the first position, and a connection portion for connecting the head section with the base section; and a fan rotatably disposed in the combustion chamber; wherein the fan includes fan blades which define a widthwise center line and having widthwise edge portions of the fan blades which define a widthwise edge line at a side of the cylinder head; and wherein the widthwise center line is offset from the connection portion toward another end of the housing, and the widthwise edge line is offset from the connection portion toward the cylinder head when the combustion chamber frame is at the second position.