The ornamental design for a knifeblock, as shown and described.
FIG. 1 is a perspective view of a knife block, shown in use, showing our new design;
FIG. 2 is a perspective view of the knife block;
FIG. 3 is a cross-sectional perspective view of the knife block, taken along line 3-3 of FIG. 2;
FIG. 4 is a partially enlarged front view of the knife block, taken from FIG. 2;
FIG. 5 is a right side view of the knife block;
FIG. 6 is a left side view of the knife block; and,
FIG. 7 is a cross-sectional left side view of the knife block, also taken along line 7-7 of FIG. 2.
The broken lines in the figures illustrate the portions of the design that form no part of the claimed design. The broken lines showing the knives and scissors in FIG. 1 illustrate environmental subject matter that form no part of the claimed design. The dot-dash broken lines of FIGS. 2 and 4 are included to show a partially enlarged view only and form no part of the claimed design. None of the broken lines form any part of the claimed design.