I claim the ornamental design for a mechanical pencil with detachable sharpener, as shown and described.
FIG. 1 is a perspective view of a mechanical pencil with detachable sharpener, showing my new design;
FIG. 2 is a front elevational view of FIG. 1 broken away and enlarged to show greater detail;
FIG. 3 is a rear elevational view of FIG. 1 broken away and enlarged to show greater detail;
FIG. 4 is a left-side elevational view of FIG. 1 broken away and enlarged to show greater detail;
FIG. 5 is a right-side elevational view of FIG. 1 broken away and enlarged to show greater detail;
FIG. 6 is an exploded front elevational view of FIG. 1 broken away and enlarged to show greater detail;
FIG. 7 is an enlarged perspective view of the sharpener, the mechanical pencil being omitted for clarity of illustration;
FIG. 8 is an enlarged top plan view thereof; and,
FIG. 9 is an enlarged bottom plan view thereof.
The broken lines showing portions of the inside and bottom in FIGS. 8 and 9 are included for the purpose of showing features of the sharpener that form no part of the claimed design.