We claim the ornamental design for an ironing board, as shown and described.
FIG. 1 is a front, top perspective view of an ironing board showing the new design;
FIG. 2 is a front, bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a right-side elevation view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a front, top perspective view in a folded state thereof; and,
FIG. 10 is a front, top perspective view of the ironing board shown in a state of use.
The broken lines showing an ironing board and an iron in FIG. 10 depict environmental structure that form no part of the claimed design. The broken lines in FIGS. 2, 5 and 8 depict portions of the ironing board that form no part of the claimed design.