Fuel feed and charge forming apparatus

Claim 1

A carburetor for an internal combustion engine including, in combination, a substantially cubically shaped body provided with a mixing passage having an air inlet region extending from a first planar surface and a mixture outlet region terminating at a second planar surface which serves for mounting the carburetor on the engine, a fuel chamber in the body, a flexible diaphragm forming a wall of the chamber, a fuel inlet passage in the body, a valve for the fuel inlet passage, control means for said fuel inlet valve including a lever actuated by movement of said diaphragm under the influence of reduced pressure in the mixing passage, a main orifice opening into the mixing passage, a throttle valve in the mixture outlet region of the mixing passage, an engine idling orifice opening into the mixing passage at the downstream side of the throttle valve, fuel channel means in said body for conveying liquid fuel from the fuel chamber to the orifices, a first pair of bosses, one extending transversely from each side of the body adjacent the air inlet region, a second pair of bosses, one boss of said second pair extending transversely from each side of the body adjacent the mixture outlet region, each boss of the second pair being in parallel alignment with a boss of the first pair, each of the bosses having a bore, the bores of the aligned pair of bosses being in spatial alignment, a pair of hollow cylindrical metal support members, one extending between each pair of spatially aligned boss bores and secured therebetween such that the ends of said support members extend only to the first and second planar surfaces, wherein said hollow cylindrical metal support members can receive a mounting bolt through its hollow center portion, thereby providing both a heat sink for cooling said carburetor and a load bearing member substantially impervious to thermal and mechanical creep, and to mechanical compression from bolt torque.