Patent ID: 8205777

Claim:
A combustion type power tool comprising: a housing; a head portion being provided at a vicinity of an end of the housing, and the head portion being formed with a fuel gas path; a cylinder being fixed to inside of the housing; a nose being extended to a lower side from a lower end portion of the cylinder; a push lever provided along the nose, the push lever being movable when the push lever is pressed to a workpiece; a piston reciprocally slidable to the cylinder in an axial direction of the cylinder, the piston being capable of partitioning the cylinder into a piston lower chamber and a piston upper chamber in the cylinder; a combustion chamber frame being movably guided at inside of the housing, the combustion chamber frame capable of being brought into contact with and being separated from the head portion in cooperation with movement of the push lever, the combustion chamber frame forming a combustion chamber with the head portion and the piston; and a connecting unit being extended along a side face of the cylinder, for connecting the push lever and the combustion chamber frame, wherein the combustion type power tool is driven by a fuel gas, and wherein the fuel gas consists essentially of 40 to 95 weight % of 1-butene and the remainder being propane.