Patent ID: 7182237

Claim:
A combustion-type power tool comprising: a housing having one end; a head section disposed near the one end of the housing and formed with a fuel passage; a cylinder secured to an inside of the housing, the cylinder having a lower end portion and an outer peripheral surface; a nose extending downward from the lower end portion; a push lever provided along the nose and movable upon pushing onto a workpiece; a piston slidably disposed in the cylinder and reciprocally movable in an axial direction of the cylinder, the piston dividing the cylinder into an upper cylinder space above the piston and a lower cylinder space below the piston; a combustion-chamber frame movably provided in the housing, the combustion-chamber frame having one end movable so as to abut the head section in one position and to be separated from the head section in an other position in interlocking relation to the movement of the push lever, a combination of the combustion-chamber frame, the head section and the piston defining a combustion chamber; a connection unit extending along the outer peripheral surface of the cylinder for mechanically associating the push lever with the combustion chamber frame, the connection unit comprises at least two arm sections each having one end connected to the combustion chamber frame, each arm section having another end, and a connector section in abutment with the push lever, the another end of each arm section being connected to the connector section, the connection unit in its entirety being covered with the housing; and a biasing member disposed between the cylinder and the connector section; wherein the biasing member is at a position out of alignment with an axis of the cylinder.