Patent ID: 7308996
Filing Date: 2007-12-18
Classification: B25C

Abstract:
1. A gas combustion type impact tool comprising: a combustion chamber that comprises an upper wall and an adjacent side wall; a driving cylinder; a driving piston opposite the upper wall, held in the driving cylinder and driven by an exertion of a combustion gas pressure occurring when a gaseous mixture including a combustible gas and air is burnt in the combustion chamber; an injection nozzle formed to face an interior of the combustion chamber and injecting the combustible gas into the combustion chamber; a rotary fan for mixing the combustible gas supplied into the combustion chamber and the air in the combustion chamber; an ignition device provided in the combustion chamber and igniting the gaseous mixture in the combustion chamber; and a vortex generator, provided on the upper wall on an upstream side of the injection nozzle in an air flow generated in the combustion chamber by the rotary fan, for generating a vortex near the injection nozzle in the combustion chamber so as to promote a mixing of the combustible gas and the air, and the vortex generator located between the injection nozzle and the rotary fan.