Patent ID: 6247681
Filing Date: 2001-06-19
Classification: F02M,Y10S

Abstract:
A carburetor for an internal combustion engine of a hand-held working tool, said carburetor comprising:a housing;a suction channel with a venturi section arranged in said housing, said suction channel having an inlet and an outlet for allowing air flow therethrough;a throttle connected in said suction channel so as to be pivotable;a control chamber;a main fuel channel connecting said suction channel and said control chamber;an idle fuel channel connecting said suction channel and said control chamber;a bypass, comprising an air supply line and a fuel supply line, for introducing an auxiliary fuel/air mixture during a starting operation of the internal combustion engine to a location of said suction channel downstream of said throttle in a direction of air flow; anda closure means for separately closing off in a closed position and air supply line and said fuel supply line of said bypass so that simultaneously the fuel supply and air supply are shut off before formation of the auxiliary fuel/air mixture.