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Granular materials applicator

  • US 5,189,965 A
  • Filed: 05/02/1990
  • Issued: 03/02/1993
  • Est. Priority Date: 05/02/1990
  • Status: Expired due to Fees
First Claim
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1. Apparatus for dispensing a predetermined quantity of granular material at a predetermined rate of application comprising:

  • support means;

    a hopper attached to said support means for holding said granular material, said hopper having a base including an orifice for allowing the granular material to pass therethrough;

    pneumatic delivery means spaced from and subtending said hopper for directing said granular material in a uniform distribution toward a dispensing location;

    a metering system including a plurality of metering roll means rotatably mounted about a common axis of rotation and positioned between said hopper orifice and said pneumatic delivery means, each of said metering roll means having a plurality of spaced pockets about its circumference, said pockets being intermediate and spaced from each of the sides of the metering roll means, each of said pockets having a substantially cylindrical internal shape with a convex end defining a volume of preselected size relative to the concentration of the material to be dispensed, each of said pockets receiving said material and directing said material toward said pneumatic delivery means upon rotation of said metering roll means;

    a plurality of segregated metering channels, each of said metering channels having an enclosed metering roll feed chute in communication with said hopper orifice and having a portion thereof defined by a cantilevered leveling knife, said leveling knife adjacent the circumference of a respective one of said metering rolls for removing excess material from said spaced pockets when said metering roll rotates about its axis of rotation;

    metering drive means for rotating said metering roll means at a preselected angular velocity; and

    control means for determining said predetermined rate of application and driving said metering drive means at said preselected angular velocity.

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