GAS COMBUSTION TYPE DRIVING TOOL

摘要

When gas is explosively burnt within a combustion chamber 5, a striking piston is impulsively driven to drive out a fastener from a nose portion. A gas tube 26 is provided between the combustion chamber 5 and a feed cylinder 21 which accommodates a feed piston that reciprocally moves a feed claw 23 engaged with and disengaged from connected fasteners to a nail feed direction for feeding to the nose portion side and an evacuation direction in opposite thereto. A check valve 31 having a restriction hole 33 is disposed on the way of the gas tube 26 so as to be opened and closed. The check valve 31 is normally urged by a spring to a closed direction and opens against the force of the spring by the gas pressure from the combustion chamber.