Metering device

A metering device comprising a housing having a top portion and a bottom portion, a material conveying chamber disposed in said bottom portion, said chamber having an air inlet and a chamber outlet for discharging air and material from said chamber, a metering disk disposed in said top portion and being adapted to oscillate in clockwise and counter clockwise direction said disk defining a first system of four openings extending therethrough and being distributed across the surface of said disk, said openings being substantially circular openings and being disposed so that openings closest to each other form an angle of about 50.degree. as measured from the center of said disk to the center of said openings, a top plate superimposed over said metering disk said top plate defining a second system of four openings extending therethrough and being distributed across the surface of said top plate, said openings being substantially circular openings and being disposed so that openings closest to each other form an angle of about 100.degree. as measured from the center of said top plate to the center of each opening, a hopper for feeding material to said openings in said top plate, air supply means for directing air into said air inlet, and through said chamber, oscillating means operatively associated with said air supply means and said disk and adapted to oscillate said disk such that when two openings of said disk are in registering relation with two openings in said top plate for filling with material from said hopper, the other two openings in said disk discharge material to said chamber, said oscillating means being adapted to synchronously rotate said disk for discharging material to said chamber while activating said air supply means to supply air to said chamber to discharge said material through said chamber outlet.