Patent ID: 7427007

Claim:
A combustion-powered tool for driving a fastener into a workpiece, comprising: a combustion chamber selectively opened to atmosphere and closed to be hermetically sealed, the combustion chamber being formed of a combustion chamber frame movable to selectively open the combustion chamber to atmosphere and close the combustion chamber to be hermetically sealed; a spark plug exposed to the combustion chamber for igniting a fuel/air mixture within the hermetically sealed combustion chamber; a driver blade that drives the fastener into the workpiece; a first switch that is selectively turned ON or OFF, the first switch being turned ON when the combustion chamber has closed; a second switch that is selectively turned ON or OFF, the second switch being turned ON when the second switch is manipulated by an operator; and a control unit that controls the spark plug to ignite the fuel/air mixture when both the first switch and the second switch are rendered ON irrespective of an order in which the first switch and the second switch are turned ON.