Shingle cutting knife blade

1. A blade, the blade comprising:

a top edge, a bottom edge located on an opposite side of the blade relative to the top edge, and left and right edges;

a lower cutting edge adjacent said left or right edge;

an upper sharpened edge positioned above said lower cutting edge and adjacent the same edge as said lower cutting edge;

at least one inner edge emanating from said bottom edge and angled towards said top edge; and

at least one nodule disposed between said lower cutting edge and said upper sharpened edge,

wherein said inner edge is tangent to said upper sharpened edge,

wherein said upper sharpened edge and lower cutting edge are configured for cutting, and said

wherein said bottom edge is parallel to and shorter than said top edge.

2. The blade of claim 1 further comprising a valley configured to capture an asphalt shingle positioned at an interface where the upper sharpened edge and the nodule meet.

3. The blade of claim 1 wherein said blade is configured to be retained in a knife.

4. The blade of claim 1 wherein said lower cutting edge comprises a flat portion configured to cut and being coplanar with said bottom edge.

5. The blade of claim 1 wherein said lower cutting edge terminates in a point.

6. The blade of claim 1 wherein said blade further comprises an additional upper sharpened edge, an additional lower cutting edge, an additional inner edge, and an additional nodule.

7. The blade of claim 1 wherein said upper sharpened edge is arc-shaped.

8. The blade of claim 7 wherein said upper sharpened edge, said lower cutting edge, and said nodule form a continuous cutting edge.

9. A knife, the knife comprising:

a blade, the blade comprising:

a top edge, a bottom edge located on an opposite side of the blade relative to the top edge, and left and right edges;

a lower cutting edge adjacent said left or right edge and an upper sharpened edge, wherein said upper sharpened edge and said lower cutting edge are configured for cutting;

at least one inner edge emanating from said bottom edge and angled towards said top edge, wherein said inner edge is tangent to said upper sharpened edge; and

at least one nodule disposed between said lower cutting edge and said upper sharpened edge,

wherein said bottom edge is parallel to and shorter than said top edge, and

wherein at least said upper sharpened edge is arc-shaped.

10. The knife of claim 9 further comprising a valley configured to capture an asphalt shingle positioned at an interface where the upper sharpened edge and the nodule meet.

11. The knife of claim 9 wherein said blade is configured to be adjustably retained in the knife.

12. The knife of claim 9 wherein said nodule lower cutting edge comprises a flat portion configured to cut and being coplanar with said bottom edge.

13. The knife of claim 9 wherein said lower cutting edge terminates in a point.

14. The knife of claim 9 wherein said blade further comprises an additional upper sharpened edge, an additional lower cutting edge, an additional inner edge, and an additional nodule.

15. The knife of claim 14 wherein said blade is removable.

16. The knife of claim 15 wherein said top edge of said blade comprises two, centrally disposed, u-shaped apertures configured to allow the blade to be retained.

17. The knife of claim 9 wherein said upper sharpened edge is arc-shaped.

18. The knife of claim 17 wherein said upper sharpened edge, said lower cutting edge, and said nodule form a continuous cutting edge.

19. A blade, the blade comprising:

a lower cutting edge and an upper sharpened edge, wherein said upper sharpened edge and said lower cutting edge are configured for cutting; and

at least one nodule disposed between said lower cutting edge and said upper sharpened edge,

wherein at least said upper sharpened edge is arc-shaped, and

wherein said upper sharpened edge, and lower cutting edge, and said nodule form a continuous cutting edge.

20. The blade of claim 19 wherein a bottom edge of said blade is parallel to and narrower than a top edge of said blade.