US Patent 7377221 Twin row planter with adjustable seed metering

A twin row planter comprises a drive and a pair of planter units powered by the drive. The planter units include seed metering wheels that are synchronized to discharge seeds in a predetermined staggered pattern along a harvesting row. One of the planter units is adjustable relative to the drive so as to achieve the desired pattern. In particular, the adjustable planter unit includes a connector that is configurable into a plurality of discrete indexing positions. The connector positions determine the relative angular offset between the metering wheels and, thereby, control the spacing of seed within the pattern.