The ornamental design for a hammer drill, as shown and described.
Cross reference is made to copending U.S. design patent application Ser. No. 29/688,912 entitled “Power Tool” by Hasenmayer et al., which was filed on even date herewith.
FIG. 1 is a front and left side perspective view of a hammer drill showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the figures illustrate portions of the hammer drill that form no part of the claimed design.