FIG. 1 is a perspective view from above of a blade sharpener, showing the new design;
FIG. 2 is a perspective view from behind of the blade sharpener of FIG. 1;
FIG. 3 is a front elevation view of the claimed design of FIG. 1;
FIG. 4 is a top plan view of the claimed design of FIG. 1;
FIG. 5 is a bottom plan view of the claimed design of FIG. 1;
FIG. 6 is a rear view of the claimed design of FIG. 1;
FIG. 7 is a right-side elevation view of the claimed design of FIG. 1; and,
FIG. 8 is a left-side elevation view of the claimed design of FIG. 1.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken dot-dash lines define boundaries of the claimed design and form no part thereof. The other broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.