Patent ID: 7063052
Filing Date: 2006-06-20
Classification: B25C

Abstract:
1. A combustion-type power tool comprising: a housing having one end and another end and defining a longitudinal direction; a head portion disposed at the one end and formed with a fuel passage; a cylinder disposed in and fixed to the housing; a push lever disposed at the another end and movable in the longitudinal direction when pressure contacting a workpiece; a piston reciprocally movable in the longitudinal direction and slidable relative to the cylinder, the piston dividing the cylinder into an upper space above the piston and a lower space below the piston; a combustion-chamber frame disposed in the housing and movable in the longitudinal direction in interlocking relation to the push lever, the combustion-chamber frame being abuttable on the head portion to provide a combustion chamber in cooperation with the head portion and the piston; a fuel supplying portion containing fuel and supplying the fuel into the combustion chamber through the fuel passage, thereby providing air-fuel mixture in the combustion chamber; a motor including a motor case disposed at the head portion and an output shaft extending from the motor case and protruding into the combustion chamber; a fan disposed in the combustion chamber and connected to the output shaft so as to be rotatable with the output shaft for promoting turbulent combustion of the air-fuel mixture, the fan and the combustion-chamber frame defining, within the combustion chamber, a high turbulent-combustion region in which the turbulent combustion is rapidly generated and a low turbulent-combustion region outside the high turbulent-combustion region; and a fin disposed at at least one of the combustion-chamber frame, the head portion, and the piston to protrude into the combustion chamber, the fin being located within the low turbulent-combustion region.