| 摘要 |
A hammering piston (4) is vertically slidably installed in a hammering cy linder (3) disposed in a tool body (1). A movable sleeve (10) provided at th e upper part of the hammering cylinder (3) is moved up and down so as to eng age and be separated from both the hammering cylinder (3) and a cylinder hea d (8) above the hammering cylinder (3), and this opens and closes a combusti on chamber. Mixed gas produced by stirring and mixing a flammable gas and ai r by a rotary fan (16) in the combustion chamber is ignited by an ignition p lug (15) disposed in the cylinder head (8) to explosively combust it. The ha mmering piston (4) is impulsively driven by the high-pressure combustion gas , and a nail is expelled by a driver (5) joined to the lower surface of the hammering piston (4). A staying part (25), in which residues remaining after the combustion of the mixed gas stays, is formed between the exposed base a nd forward end of the center electrode of the ignition plug (15) exposed to the outside facing downward.
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