초록 ▼

An internal combustion powered tool, such as a nail or fastener driver, and a control system, spark source, and rotary valve for use in an internal combustion powered tool are disclosed. The tool may include, for example, a cylinder and a piston reciprocally moveable within the cylinder. A combustio

An internal combustion powered tool, such as a nail or fastener driver, and a control system, spark source, and rotary valve for use in an internal combustion powered tool are disclosed. The tool may include, for example, a cylinder and a piston reciprocally moveable within the cylinder. A combustion chamber is defined at one end of the cylinder, with the piston comprising a portion of one end of the combustion chamber. The tool may have a fastener driver associated with the piston, and a magazine for feeding fasteners into registration with the driver. A fuel flow passageway extends between a fuel source and the combustion chamber, and a metering valve controls the flow of fuel to the combustion chamber. A spark source within the combustion chamber is provided for igniting the fuel, and an intake and exhaust valve that includes a pair of diametrically opposed apertures is provided. At least one fan external to the combustion chamber induces an intake of fresh air into the combustion chamber through one of the apertures and an exhaust of combustion products from the combustion chamber through the other aperture. Additional and alternative details and features are described in the disclosure.

대표청구항 ▼

[ What is claimed is:] [7.] An internal combustion tool comprising:(a) a cylinder and a piston reciprocally movable within said cylinder;(b) a combustion chamber defined at one end of said cylinder;(c) a spark source for igniting a fuel-air mixture within said combustion chamber, said spark source d

[ What is claimed is:] [7.] An internal combustion tool comprising:(a) a cylinder and a piston reciprocally movable within said cylinder;(b) a combustion chamber defined at one end of said cylinder;(c) a spark source for igniting a fuel-air mixture within said combustion chamber, said spark source defining a plurality of spark gaps at spaced locations within said combustion chamber; and(d) a voltage source connected to said spark source for applying a voltage across said spark gaps to cause a plurality of sparks at spaced locations within said combustion chamber to enhance combustion of a fuel-air mixture therewithin.