Detoxication device for exhaust gases of internal-combustion engines

Claim 1

The combination with an internal-combustion engine having a carburetor provided with a butterfly valve controlled by an accelerator pedal and feeding fuel-air mixture to an intake manifold of the engine, of a detoxification device interposed between said carburetor and said intake manifold, said detoxification device comprising: a generally flat casing formed with a passage communicating between said carburetor and said intake manifold and formed on one side with an intake orifice; a ring received in said casing on the opposite side of said passage and defining therein a ring-shaped diffusor channel outwardly of said orifice and an annular slot extending around the circumference of said orifice, and opening from said channel inwardly at the end of said orifice, said ring being formed with an outlet orifice widening away from said slot, said casing being formed with a bore communicating with said channel at one end of the bore, another passage extending annularly from said bore and communicating therewith, a fitting mounted on said casing for supplying secondary air thereto, and a rectangular channel extending perpendicular to said fitting and said further passage; a slidable shield received in said rectangular channel and formed with a small cross section opening and a large cross section opening respectively alignable with said further passage; and operating means connected with said shield for selectively positioning said openings in communication between said fitting and said further passage in response to displacement of said accelerator.