The ornamental design for a pushbroom, as shown and described.
FIG. 1 is a perspective view of a push broom showing my new design;
FIG. 2 is a front view thereof, the rear being a mirror image thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof; and,
FIG. 5 is a right side view thereof, the left side being a mirror image thereof.
The broken line showing in FIGS. 1–4 of the portion of the broom handle, the holes for receiving the handle, the bristles, and the bottom face of the push broom are for illustrative purposes only and form no part of the claimed design.