Patent ID: 8646671

Claim:
A combustion-powered fastener-driving tool, comprising: a combustion chamber defined around an axis and into which an air-fuel mixture is to be charged; intake and exhaust valve means operatively associated with said combustion chamber and movable between first OPEN and second CLOSED positions for controlling the intake of air into said combustion chamber and the exhaust of combustion products out from said combustion chamber; fuel injection means for injecting fuel into said combustion chamber and thereby forming an air-fuel mixture within said combustion chamber; ignition means disposed within said combustion chamber for igniting the air-fuel mixture disposed within said combustion chamber; a trigger mechanism; and a solenoid operated mechanism operatively connected to said intake and exhaust valve means for controlling the opening and closing of said intake and exhaust valve means with extremely quick movements, at appropriate times of a tool operational cycle, so as to effectively minimize the fastener-driving tool operational cycle times, wherein, said fuel injection means is disposed adjacent to a peripheral side wall portion of said combustion chamber such that said air and fuel respectively enter said combustion chamber from said air intake manifold and said fuel injection means in a tangential manner relative to said peripheral side wall portion such that the air-fuel mixture is conducted in accordance with a vortex type flow pattern within said combustion chamber.