Modular broadcast spreader

1. A broadcast spreader comprising:

a pair of chassis rails, wherein each chassis rail includes:

an elongate frame member having a first end for mounting a head pulley and a second end for mounting a tail pulley;

a first plurality of spaced-apart apertures to allow visual inspection of a plurality of bed rollers; and

a second plurality of spaced-apart apertures to allow visual inspection of a plurality of return rollers;

each chassis rail including an outwardly extending upper flange;

a hopper having an upper portion and a lower portion, the upper portion having two side walls which inwardly converge, and a lower portion in which the side walls outwardly diverge and then extend substantially vertical;

wherein the upper portion of the hopper is supported by the outwardly extending upper flanges and the lower portion of the hopper is removably secured to the chassis rails.

2. The broadcast spreader according to claim 1 , wherein the side walls have a support flange which abuts the outwardly extending upper flange.

3. The broadcast spreader according to claim 2 , wherein the hopper is removably secured to the outwardly extending upper flange.

4. The broadcast spreader according to claim 1 , further including an endless conveyor belt disposed about transversely extending pulleys.

5. The broadcast spreader according to claim 4 , wherein the side walls are provided with skirts that act as an intermediary between the hopper and the conveyor belt.

6. The broadcast spreader according to claim 5 , wherein the skirts are formed from rubber.

7. The broadcast spreader according to claim 1 , further comprising at least one self-cleaning pulley.

8. The broadcast spreader according to claim 7 , wherein the self-cleaning pulley comprises a plurality of spaced-apart support plates with openings, affixed on a shaft having a first end and a second end;

a plurality of spaced-apart frame members affixed to the support plates to form an outer surface of the pulley, and

a plurality of auger members affixed to the shaft between said support plates, wherein each auger member has a spiral flight portion extending around said shaft to direct debris from a center portion of the shaft towards the ends of the shaft for expulsion through the openings of the support plates.

9. The broadcast spreader according to claim 8 wherein the spaced-apart frame members are evenly spaced.

10. The broadcast spreader according to claim 9 , wherein the plurality of spaced-apart support plates are substantially equal in outer diametrical size.

11. The broadcast spreader according to claim 10 , wherein the shaft has a substantially constant outside diameter.

12. The broadcast spreader according to claim 11 , wherein the spiral flight portion has a substantially constant effective outside diameter.

13. The broadcast spreader according to claim 12 , wherein the frame members extend substantially parallel to the shaft.

14. The broadcast spreader according to claim 7 , wherein the self-cleaning pulley is formed with a plurality of spiral grooves or channels.