Patent ID: 8511264

Claim:
A fuel supply and combustion chamber system for use within a power tool, comprising: a piston chamber within which a working piston is disposed; a combustion chamber; a liquid fuel supply containing a supply of liquid fuel; a valve, fluidically connected to said liquid fuel supply, for dispensing a predetermined amount of said liquid fuel from said liquid fuel supply; an evaporator, fluidically connected at a first end portion thereof to said valve, for converting said predetermined amount of said liquid fuel, dispensed by said valve, into a gaseous fuel, and fluidically connected at a second end portion thereof to said combustion chamber for supplying said gaseous fuel to said combustion chamber; a jet pump interposed between said evaporator and said combustion chamber for entraining air into said dispensed gaseous fuel so as to define an air-fuel mixture, having predetermined stoichiometric ratio, for introduction into said combustion chamber; a check valve operatively associated with said combustion chamber for fluidically connecting said combustion chamber to said piston chamber when a relatively high predetermined pressure level is attained within said combustion chamber during a combustion cycle; and a bypass valve interposed between said combustion chamber and said piston chamber for fluidically connecting said combustion chamber to said piston chamber, under relatively low pressure exhaust gas scavenging conditions, as a scavenging air-fuel mixture is introduced from said jet pump, into said combustion chamber, and into said piston chamber so as to scavenge combustion products out from said piston chamber.