Patent ID: 7428874

Claim:
A seeder for dispensing seeds of different sizes on the soil, comprising: a seed metering tube defining at spaced intervals along its length a series of pairs of seed openings, each pair of seed openings including a seed entrance opening and a seed discharge opening, the seed entrance openings being positioned on diametrically opposed sides of the seed metering tube from the seed discharge openings, a plurality of seed feed wheels positioned in the seed metering tube with each seed feed wheel positioned in alignment with a pair of seed openings, the seed feed wheels each including at least two lines of seed detents oriented circumferentially about the seed feed wheel with the detents of one of the lines of seed detents being of greater size than the seed detents of the other line of seed detents for feeding seeds of different sizes, the seed feed wheels each including smooth cylindrical bearing surfaces positioned on opposite sides of and adjacent the line of seed detents, and adjustment means for shifting the seed feed wheels along the length of the cylindrical seed metering tube such that one of the lines of seed detents of each seed feed wheel can be moved toward registration with the pairs of seed openings of the cylindrical seed metering tube as the other lines of the seed detents are moved out of registration with the pairs of seed openings and a smooth bearing surface of the seed feed wheels can move into registration with the pairs of seed openings.