A combustion-type power tool includes a cylinder having a peripheral wall which has an inner peripheral surface and an outer peripheral surface. The peripheral wall is formed with an exhaust hole at a first axial position. A piston is reciprocally movable in an axial direction and is slidable in contact...http://www.google.es/patents/US7063053?utm_source=gb-gplus-sharePatente US7063053 - Combustion type power tool having fin for effectively cooling cylinder
Combustion type power tool having fin for effectively cooling cylinder
