Patent ID: 8267295

Claim:
A combustion powered nail gun, comprising: a housing; a combustion sleeve mounted in the housing and reciprocally moveable between a sealed position where a combustion chamber is defined therein, and an open position; a trigger switch disposed in the housing and provided with a first hook portion; a safety lever pivotally mounted in the housing and provided with a second hook portion biasable between a locked position where the second hook portion is engaged with the first hook portion of the trigger switch, and a released position where the second hook portion is spaced away from the first hook portion of the trigger switch; a security member having a workpiece contact member and a linkage slidably mounted in the housing, connected with the combustion sleeve and provided with an end extending out of the housing and connected with the workpiece contact member; and a restriction member connected to and moveable along with the combustion sleeve in a way that when the combustion sleeve is in the open position, the restriction member blocks the safety lever to prohibit a pivotal movement of the safety lever for holding the second hook portion of the safety lever at the locked position so as to lock the trigger switch, and when the combustion sleeve is in the sealed position, the restriction member is spaced away from the safety lever to enable the second hook portion of the safety lever to be biased to the released position so as to unlock the trigger switch; and a fan switch and an ignition switch respectively mounted in the housing; wherein when the combustion sleeve is moved to the sealed position, the restriction member is moved away from the safety lever and activates the fan switch, and the trigger switch is pressable to activate the ignition switch.