Carburetor with self adjusting venturi

A carburetor comprising:

• a hollow mixing chamber provided with a fuel inlet means at one end and a fuel outlet means at the other end,
• the interior of said hollow chamber forming a venturi shaped opening tapering from a minimum diameter at a point along its length toward a larger diameter opening at one end of said chamber,
• a piston movably mounted in said opening for movement longitudinal thereof,
• whereby movement of said piston within said opening forms a variable first venturi section between its outer periphery and the inside surface of said opening,
• a needle valve engaged at one of its ends with said piston for movement by said piston within said fuel inlet means,
• said piston comprising a hollow cylindrical extension in which one end of said fuel inlet means extends,
• said needle valve being movable within said extension,
• biasing means attached to said carburetor and engaging said piston for biasing said piston toward said needle valve into said fuel inlet means,
• said needle valve controlling the flow of fuel through said fuel inlet means to said opening and around at least a part of said piston,
• a first air inlet means connected to said one end of said chamber,
• said first air inlet means providing a passageway into said chamber for air drawn thereinto for mixing with the fuel from said fuel inlet means during movement of the fuel over the outer periphery of said piston and through said first venturi section into said fuel outlet means,
• an apertured tube mounted along the length of said fuel inlet means and extending within said extension and around said needle valve,
• at least a part of the apertures of said tube being in communication with said first air inlet means,
• the air entering through the apertures in said tube flowing along the outer periphery of said fuel inlet means and drawn into the fuel emitted from said fuel inlet means,
• the air drawn into the carburetor for mixing with the fuel from said fuel inlet means during the movement of the fuel over the outer periphery of said piston and through said venturi section and into said fuel outlet means occurs through the effects of a negative pressure applied to said fuel outlet means.