Dual rotary impeller broadcast spreaders
AssigneeThe O. M. Scott & Sons Company
InventorsSteve P. Courtney, James D. Amerine
Life of this patent
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Abstract
A spreading device is disclosed including two impellers mounted to rotate in rotational correspondence about their axes toward one another as the device is moved in a forwardly advancing direction so as to broadcast particulate materials deposited thereon in a controlled distribution pattern along a predetermined distribution path generally in the direction of advancement of the device onto a selected target area.
Claims27
A spreader for broadcasting particulate materials in a controlled distribution pattern onto a selected target area comprising:
- a housing;
- means for driving said housing in a forwardly advancing direction;
- first and second impellers mounted on said housing in adjacent alignment for rotary motion about their respective central axes, said impellers rotating in rotational correspondence toward one another as said housing is driven in said forwardly advancing direction;
- said housing having means for storing said particulate materials and for depositing said materials onto at least one material drop position located on a top surface of each of said impellers along a circular path lying a radial distance of between about 1 to about 2 inches from said central axis of each of said impellers;
- said impellers being structured and positioned in a manner such that said rotation thereof in said rotational correspondence as said housing is driven in said forwardly advancing direction causes said particulate materials deposited thereon to be broadcast therefrom in a controlled distribution pattern generally in the direction of spreader advancement as said spreader is driven in a forwardly advancing direction and in a manner such that an additive spreading effect is achieved from the two rotating impellers providing an even coverage of said target area.
A spreader for broadcasting particulate materials in a controlled distribution pattern along a predetermined distribution path comprising:
- a housing;
- means for driving said housing in a forwardly advancing direction;
- a first impeller mounted on said housing for rotary motion about a central axis thereof and a second impeller mounted on said housing for rotary motion about a central axis thereof, said impellers being positioned in adjacent alignment within a common horizontal plane;
- said first impeller rotating in a clockwise direction and said second impeller rotating in a counterclockwise direction so that said impellers rotate towards one another as said housing is driven in said forwardly advancing direction;
- said housing having means for depositing said particulate materials onto at least one material drop position located on each of said impellers along a circular path lying a first radial distance from said central axis of each of said impellers, said first radial distance being calculated from the equation:
- First Radial Distance=R[cosh Y[(MU.sup.2 +1).sup.1/2 -MU]].sup.-1
- wherein R is the radial distance from the central axis of said impeller to an exit point at the outer edge of the impeller;
- MU is the kinetic coefficient of friction between the particulate materials and the impeller;
- and Y is an angle indicating the angular displacement of the impeller between the drop point and the exit point;
- said rotation of said impellers causing said particulate materials deposited thereon to be ejected from said impellers in a controlled distribution pattern generally in the direction of spreader advancement as said spreader is driven in a forwardly advancing direction.
Dependencies are inferred from the claim text.