Patent ID: 8113403

Claim:
A gas internal combustion type nailing machine, comprising: a striking cylinder for slidably accommodating a striking piston therein; a tubular-shaped housing that is movable relative to a main body of the nailing machine; a combustion chamber disposed in an upper side of the striking cylinder and configured to be opened and closed by the housing; a fan disposed in a central portion of the combustion chamber; a tubular-shaped sleeve interposed between the housing and the fan, and fixed to the main body of the nailing machine; and communication holes respectively provided through portions of a peripheral wall of the sleeve in an upper side and a lower side of the fan, and configured to communicate the combustion chamber with an annular space portion formed between the housing and the sleeve the annular space portion defining a flow path from the communication hole provided at the lower side of the fan to the communication hole provided at the upper side of the fan.