Patent ID: 6860243

Claim:
A combustion chamber system, for use within combustion-powered fastener-driving tools, comprising: a pre-combustion chamber having an aspect ratio, defined by means of the ratio of the length dimension of said pre-combustion chamber relative to the width dimension of said pre-combustion chamber, which is at least 2:1; means defined within an upstream end portion of said pre-combustion chamber for initiating combustion of an air-fuel mixture which propagates through said pre-combustion chamber, from said upstream end portion of said pre-combustion chamber to a downstream end portion of said pre-combustion chamber, by means of a flame front; a final combustion chamber fluidically connected by a port to said downstream end portion of said pre-combustion chamber and having a working piston operatively disposed at a downstream end portion of said final combustion chamber for driving fasteners out from the tool and into a substrate; and first obstacle means disposed within said pre-combustion chamber for selectively enhancing and retarding the rate of burn of said air-fuel mixture within said pre-combustion chamber, and the speed at which said flame front propagates through said pre-combustion chamber.