Debris-collecting apparatus and method of collecting debris

1. A debris-collecting apparatus, comprising:

a mobile frame;

an input portion configured to receive incoming air and debris; and

a bagging portion comprising:

a hood having a spiral portion;

an air permeable bag removably positioned below the hood, the air permeable bag having an inner face comprising a plurality of pores;

a dust skirt surrounding the air permeable bag and configured to filter the air and debris passing through the air permeable bag; and

a bagging passage for directing the air and debris from the input portion to the hood,

wherein the spiral portion extends from the bagging passage to the air permeable bag such that the air and debris from the bagging passage travels along the spiral portion to induce a spiral flow of air and debris and thereafter apply a dislodging force to debris collected at the inner face of the air permeable bag.

2. The debris-collecting apparatus of claim 1 , wherein the spiral portion has a first end and a second end, the first end vertically offset from the second end.

3. The debris-collecting apparatus of claim 2 , wherein the spiral portion has an inner perimeter and an outer perimeter, the inner perimeter defining an opening in the hood.

4. The debris-collecting apparatus of claim 3 , wherein the spiral portion extends at least 270° about a vertical axis located along a center of the opening.

5. The debris-collecting apparatus of claim 4 , wherein the spiral portion has a pitch of 5-8 inches of drop per revolution of the vertical axis.

6. The debris-collecting apparatus of claim 3 , wherein the opening in the hood begins at the first end of the spiral portion, is located along the inner perimeter of the spiral portion, and ends at the second end of the spiral portion.

7. The debris-collecting apparatus of claim 6 , further comprising a filter extending downwardly from the opening.

8. The debris-collecting apparatus of claim 7 , wherein during operation the incoming air and debris is received by the bagging portion, a majority of the debris is collected by the air permeable bag, the filter prevents any remaining debris from exiting through the opening in the hood, and the air exits the bagging portion through the opening in the hood.

9. The debris-collecting apparatus of claim 7 , further comprising a deflecting plate coupled to the hood, wherein the deflecting plate covers the opening to direct the air exiting through the opening.

10. The debris-collecting apparatus of claim 1 , wherein the mobile frame includes one or more wheels.

11. A debris-collecting apparatus, comprising:

a mobile frame;

an input portion for receiving an incoming flow of air and debris; and

a bagging portion comprising:

a hood having a spiral portion, a first end, and a second end;

an air permeable bag removably positioned below the hood, the air permeable bag having an inner face;

a dust skirt surrounding the air permeable bag and configured to filter debris passing through the air permeable bag; and

a bagging passage,

wherein the bagging passage connects the input portion to the first end of the hood so that the flow of air and debris is directed from the input portion to the first end of the hood, and the spiral portion of the hood is configured to induce a spiral flow of air and debris from the second end of the hood to the air permeable bag to dislodge collected debris on the inner face of the air permeable bag.

12. The debris-collecting apparatus of claim 11 , wherein the spiral portion includes an inner perimeter and an outer perimeter, and wherein the inner perimeter defines an opening in the hood.

13. The debris-collecting apparatus of claim 12 , wherein the spiral portion extends at least 270° about a vertical axis located along a center of the opening.

14. The debris-collecting apparatus of claim 12 , further comprising a filter extending downwardly from the opening.

15. The debris-collecting apparatus of claim 14 , wherein the filter extends at least partially and downwardly into the air permeable bag and provides an inner boundary around which the air and debris must pass.

16. The debris-collecting apparatus of claim 15 , wherein the spiral portion of the hood and the filter extending at least partially into the air permeable bag are configured to induce the spiral flow of air and debris from the hood to the air permeable bag to dislodge the collected debris on the inner face of the air permeable bag.

17. The debris-collecting apparatus of claim 16 , wherein during operation, the incoming flow of air and debris is received by the input portion, the flow of air and debris is directed from the input portion to the hood by the bagging passage, the spiral portion of the hood and the filter extending at least partially into the air permeable bag induce the spiral flow of air and debris, the spiral flow of air and debris dislodges the collected debris on the inner face of the air permeable bag, a majority of the debris is collected away from the inner face of the air permeable bag, the filter prevents any remaining debris from exiting through the opening in the hood, and a flow of the air exits the bagging portion through the opening in the hood.

18. The debris-collecting apparatus of claim 11 , wherein the dust skirt has an inner face with an electrical charge, and wherein the inner face of the dust skirt is configured to collect debris passing through the air permeable bag.

19. The debris-collecting apparatus of claim 11 , wherein the mobile frame includes one or more wheels.