Patent ID: 8006880
Filing Date: 2011-08-30
Classification: B25C

Abstract:
1. A The gas combustion type driving tool comprising: a combustion chamber; a trigger lever; a contact arm; a contact mode; a trigger mode; a trigger switch turned on to complete an electrical connection when the trigger lever is pulled; a contact switch turned on to complete an electrical connection when the contact arm is pressed against the workpiece; and a combustion chamber opening timer, wherein in a first configuration the combustion chamber is closed, fuel gas is injected into the combustion chamber, air in the combustion chamber and the fuel gas are stirred to each other, and mixed gas is generated, when the trigger lever is pulled before the contact arm is pressed against a workpiece, wherein in a second configuration the mixed gas is ignited, when the contact arm is pressed against the workpiece into which a fastener is driven, and after the mixed gas is ignited and a first period has passed, the combustion chamber is opened and the combustion gas is exhausted, wherein, in the contact mode, wherein, in the trigger mode, wherein, when either the trigger switch or the contact switch is successively turned on after the combustion chamber is opened, the combustion chamber is closed and the fuel gas is injected after the combustion chamber opening timer counts a second period.