Patent ID: 7527248

Claim:
Diaphragm carburetor ( 1 ) for internal combustion engines, comprising: a carburetor body ( 2 , 2 ′) provided with a feed duct ( 3 ) of an air/fuel mixture to the engine, said duct ( 3 ) being intercepted by at least one butterfly valve ( 20 ); pumping means comprising a diaphragm pump ( 6 ) communicating on one side with the crankcase of the motor and on the other side with a fuel tank, said diaphragm pump ( 6 ) being driven by the pulses coming from the motor; metering means comprising a diaphragm meter ( 7 ) adapted to keep a first chamber ( 13 ) and a second chamber ( 12 ) separate, with said diaphragm meter ( 7 ) interposed, said first chamber ( 13 ) being at environment pressure, and said second chamber ( 12 ) communicating both with said diaphragm pump ( 6 ), on the side which communicates with the tank, through a line intercepted by a valve controlled by the diaphragm meter ( 7 ) itself, and said feed duct ( 3 ) of the mixture, characterized in that said pumping means and said metering means are integrally made on a single block ( 5 ) fixed directly on one side of the carburetor body ( 2 ).