Patent ID: 7305940

Claim:
A combustion-type power tool comprising: a housing having one end; a cylinder head disposed at the one end and formed with a fuel injection passage; a cylinder disposed in and fixed to the housing, the cylinder defining an axial direction; a piston slidably disposed in the cylinder and reciprocally movable in the axial direction; a combustion chamber frame disposed in the housing and movable in the axial direction, the combustion chamber frame being abuttable on the cylinder head to provide a combustion chamber in cooperation with the cylinder head and the piston; a fan rotatably disposed in the combustion chamber for agitating and mixing an air with a combustible gas injected into the combustion chamber through the fuel injection passage; an ignition unit comprising an ignition plug exposed to the combustion chamber, and an ignition ground that generates a spark between the ignition plug and the ignition ground to ignite a mixture of air and the combustible gas, to thus provide a fire; and a protecting member that protects the fire against a flow of the mixture of air and the combustible gas, the flow being provided by the rotation of the fan.