Robot Cleaner

FIG. 1 is a front perspective view of a robot cleaner showing our new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a left-side view thereof; FIG. 5 is a right-side view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; FIG. 8 is an enlarged view of the encircled portion 8 in FIG. 1 ; FIG. 9 is an enlarged view of the encircled portion 9 in FIG. 1 ; and, FIG. 10 is a front perspective view of the robot cleaner shown in an alternate state of use. The evenly-dashed broken lines in the figures depict portions of the robot cleaner which form no part of the claimed design. The dot-dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.