Patent ID: 6065739
Filing Date: 2000-05-23
Classification: B27B,F02B,F02M,Y10S

Abstract:
A diaphragm carburetor for an internal combustion engine of a portable hand-held working tool, said carburetor comprising:a housing;a control chamber arranged in said housing;a suction channel extending through said housing and having a venturi section;an inlet valve connected to said control chamber and supplying said control chamber with fuel;a main valve channel connecting said control chamber to said venturi section of said suction channel;a check valve positioned in said main valve channel adjacent to said control chamber and closing said main valve channel toward said control chamber;said main valve channel having a straight and elongate portion extending from said check valve into said venturi section and projecting into said suction channel;said main valve channel having a widened portion forming a valve chamber in which said check valve is positioned;said check valve comprising a closure plate delimiting said valve chamber toward said control chamber;said closure plate having a valve seat facing said control chamber;said check valve comprising a valve member freely moveably arranged in said valve chamber and having a first end position in which said valve member rests against said valve seat and said check valve is closed;said closure plate having a valve opening forming a direct short connection between said control chamber and said valve seat of said check valve; andsaid valve opening being a fixed diameter throttle.