초록 ▼

A piston velocity control and stability control system is provided for a combustion powered tool having a self contained combustion engine. The system includes a ring that may be adjusted relative to exit ports in a cylinder of the combustion engine. The ring includes openings which may be increment

A piston velocity control and stability control system is provided for a combustion powered tool having a self contained combustion engine. The system includes a ring that may be adjusted relative to exit ports in a cylinder of the combustion engine. The ring includes openings which may be incrementally aligned between a completely exposed, and a substantially closed position relative to the exit ports. Displaced air volume within the cylinder exits through the exit ports as a piston advances down the cylinder, and the velocity of the piston will be greatest when the exit ports are completely exposed. User initiated reduction of the effective size of the exit ports by adjustment of the ring will reduce piston velocity as described per application. A nosepiece used to guide the driver blade and position the blade over a fastener is isolated from the cylinder so that the nosepiece remains stable relative to the workpiece upon combustion and until the driver blade strikes the fastener.

대표청구항 ▼

[ What is claimed is:] [1.] A combustion-powered fastener-driving tool, comprising:a housing having a combustion chamber defined therein and enclosing a power source for creating combustion;a cylinder operatively connected to said combustion chamber;a piston movably disposed within said cylinder and

[ What is claimed is:] [1.] A combustion-powered fastener-driving tool, comprising:a housing having a combustion chamber defined therein and enclosing a power source for creating combustion;a cylinder operatively connected to said combustion chamber;a piston movably disposed within said cylinder and adapted to be driven by said combustion developed within said combustion chamber;a driver blade operatively connected to said piston so as to be driven by said piston toward a fastener so as to impact the fastener and drive the fastener into a workpiece;a nosepiece configured for accepting said driver blade, for contacting the workpiece, and for guiding said driver blade so as to impact the fastener as said piston is driven toward a terminal end of said cylinder;a bumper fixedly mounted upon said nosepiece for defining the end of travel of said piston within said cylinder when said piston is driven by said combustion toward said terminal end of said cylinder; andisolation means interposed between said nosepiece and said cylinder for isolating said nosepiece and said bumper from reactive movement of said cylinder, induced by said combustion of said sower source within said combustion chamber, by permitting said cylinder to undergo said reactive movement while said nosepiece and said bumper remaining substantially stationary with said nosepiece in contact with the workpiece after occurrence of said combustion and prior to impact and driving of the fastener by said driver blade.