Combustion-type power tool having ignition proof arrangement

An ignition arrangement in a combustion type power tool in which a fan is provided in a combustion chamber defined by a cylinder head, a movable combustion chamber frame, a cylinder and a piston, a motive power of the piston being generated upon combustion of a mixture of air and a combustible gas in the combustion chamber, the arrangement comprising:

• an ignition plug exposed to the combustion chamber;
• an ignition ground disposed in the combustion chamber and generating a spark between the ignition plug and the ignition ground to ignite the mixture to thus provide a fire;
• and
• a protecting member disposed in the combustion chamber that protects the fire against a flow of the mixture provided by the rotation of the fan.

A combustion-type power tool comprising:

• a housing defining an outer frame;
• a combustion chamber provided in the housing
• a fan provided in the combustion chamber and mixing an air with a combustible gas injected into the combustion chamber;
• an ignition unit comprising an ignition plug and an ignition ground, the ignition unit provided in the combustion chamber;
• and
• a flow speed decreasing member that decreases a flow speed of a mixture of the air and the combustion gas running through a area between the ignition plug and the ignition ground.