Combustion gas powered fastener driving tool

A portable fastener driving tool comprising:

• a manually grippable housing, a cylinder in said housing, a piston in said cylinder and movable through a driving stroke from a driving to a driven position, a supply of fasteners associated with said housing, means carried by said piston for driving said fasteners one at a time into a workpiece, means defining a combustion chamber within said housing, said combustion chamber communicating with said cylinder, passage means in said housing for directing air and fuel into said combustion chamber, means associated with said combustion chamber for creating turbulence therein, control means operable in response to gripping of said housing for initiating operation of said means for creating turbulence, means for igniting the air fuel mixture in said combustion chamber to drive said piston from said driving position to said driven position, and means for preventing initiation of operation of said igniting means until said housing has been placed on contact with a workpiece.

The method of driving a fastener comprising:

• providing a source of ignitable fuel having a lubricating medium therein, metering a measured amount of said ignitable fuel and lubricant into a combustion chamber, locating a driving member in direct communication with said combustion chamber and in alignment with a fastener to be driven, and igniting said fuel to instantaneously drive said driving member to cause said fastener to engage a workpiece.