Spreader device

1. A spreader device adapted to spread deliverable materials over a delivery path, the spreader device comprising:

a container and a conveyor assembly, the container positioned above the conveyor assembly;

the container including at least a front end wall, a rear end wall, a first sidewall, and a second sidewall, the front end wall and rear end wall positioned opposite one another with the first sidewall and second sidewall each configured as sides of the container and extending from a position at or near the front end wall to a position at or near the rear end wall;

at least one of the front end wall or the rear end wall including a guide rail that is approximately horizontally oriented near a bottom portion of the respective wall;

the conveyor assembly including a conveyor belt that is configured to disperse the deliverable materials from the container, the deliverable materials exiting the container beneath the front end wall, the conveyor belt having a length that extends from approximately the front end wall to approximately the rear end wall and a width that extends from approximately the first sidewall to approximately the second sidewall;

wherein at least one of the first sidewall and second sidewall is an adjustable sidewall that includes an upper plate and a lower plate that overlap and are slidably coupled to one another, the upper plate pivotably attached to an upper portion of the container such that the adjustable sidewall may move inwards or outwards so as to narrow or widen the delivery path relative to the width of the conveyor belt, a lower portion of at least one of the lower plates of at least one of the sidewalls moving within the guide rail;

wherein the deliverable materials are placed within the container and atop the conveyor assembly and the conveyor assembly spreads the deliverable materials over the delivery path.

2. The spreader device of claim 1 , wherein the conveyor assembly spreads the deliverable materials beneath the conveyor assembly in a path that is approximately no wider than the width of the conveyor belt.

3. The spreader device of claim 1 , wherein the container includes a top and a bottom that are both at least partially open.

4. The spreader device of claim 1 , wherein as the adjustable sidewall is adjusted inward the lower plate extends downward along the upper plate towards the center of the conveyor assembly.

5. The spreader device of claim 1 , wherein the lower plate has one or more vertically aligned slots and the upper plate has a corresponding number of protrusions that are slidably secured in the vertically aligned slots.

6. The spreader device of claim 1 , wherein a sheet is inserted between the lower plate and the upper plate.

7. The spreader device of claim 1 , wherein each of the first sidewall and the second sidewall are adjustable sidewalls.

8. The spreader device of claim 1 , wherein interior portions of the front end wall and the rear end wall each have guide rails and the one or more adjustable sidewalls have insertion slots that are positioned in and slide along the guide rails as the adjustable sidewalls are adjusted.

9. The spreader device of claim 1 , further comprising at least one adjustment device that controls movement of the at least one adjustable sidewall.

10. The spreader device of claim 9 , wherein the adjustment device includes a jack that has an upper end that is affixed to the adjustable sidewall and pushes or pulls the lower end of the adjustable sidewall depending on a direction of movement of the jack.

11. The spreader device of claim 9 , further including a cross bar that extends along the side of the container and is affixed on one end to the front end wall and on another end to the rear end wall, and wherein an upper end of the adjustment device is pivotably affixed to the cross bar.

12. The spreader device of claim 1 , wherein the conveyor belt that is controlled by a drive system.

13. The spreader device of claim 1 , wherein the front end wall includes an openable gate.

14. The spreader device of claim 1 , wherein the container and conveyor assembly are affixed to a mounting frame, the mounting frame being attachable to a delivery vehicle.

15. The spreader device of claim 1 , further including at least a second container positioned above a second conveyor assembly and a third container positioned above a third conveyor assembly, each of the containers and conveyor assemblies affixed to a single mounting frame that is attachable to a delivery vehicle.