Patent ID: 6983871

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, fuel being introduced into the hermetically sealed combustion chamber to fill the combustion chamber with a fuel/air mixture; a spark plug exposed to the combustion chamber for igniting the fuel/air mixture within the hermetically sealed combustion chamber, wherein inner pressure of the combustion chamber increases when the fuel/air mixture is ignited within the hermetically sealed combustion chamber; a driver blade that is moved in accordance with the increase in the inner pressure of the combustion chamber, the fastener being driven into the workpiece caused by the increase in the inner pressure of the combustion chamber; a first switch that produces a first signal when a condition in which the combustion chamber is hermetically sealed is detected; a second switch that produces a second signal 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 operated irrespective of an order in which the first switch and the second switch are operated.