High speed precision planter

A precision planter having

• a. a seed box,
• b. a vacuum source,
• c. at least one perforated disc having a seed side and a vacuum side,
• d. a housing around the disc,
• e. a rotatable shaft through the housing,
• f. said disc mounted on said shaft,
• g. a seed reservoir on the seed side of the disc connected to the seed box,
• h. a vacuum chamber on the vacuum side of the disc connected to the vacuum source,
• i. a discharge chute connected to the housing and extending to an earth working implement, and
• j. release means on the housing for releasing seed from the disc and into the chute;
• wherein the improvement comprises:
• k. a plate on the shaft,
• l. a pair of lugs on the plate,
• m. the lugs fitting into disc holes on the disc,
• n. said plate fitting against the seed side of the disc,
• o. said disc is held against a flat face of the vacuum chamber by differential pressure, and
• p. a second disc mounted upon said shaft as defined above.

A process for precisely planting seed including

• a. rotating a first perforated disc in a housing,
• b. supplying a reservoir of seed against a seed side of the disc,
• c. applying differential air pressure to the disc with a higher air pressure upon the seed side of the disc from the other side of the disc in order to
• d. hold seed to the perforations in the disc, and
• e. releasing the seed from the disc into a discharge chute;
• wherein the improvement comprises:
• f. rotating a second perforated disc in the housing,
• g. supplying a reservoir of seed against a seed side of the second disc,
• h. applying differential air pressure to the second disc with a higher air pressure upon the seed side of the second disc than upon the other side of the disc, in order to
• i. hold seed to the perforations in the second disc, and
• j. releasing the seed from the second disc into the discharge chute.