Robot Vacuum Cleaner

FIG. 1 is a top perspective view of a robot vacuum cleaner, showing my new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom view thereof; FIG. 9 is an enlarged detail view of area 9 in FIG. 2 ; and, FIG. 10 is an enlarged detail view of area 10 in FIG. 2 . The broken lines in the drawings illustrate the portions of the robot vacuum cleaner, which form no part of the claimed design. The broken lines encircling the enlarged views are for annotative purposes only and form no part of the claimed design thereof.