The ornamental design for convertible sofa or similarunit of furniture, substantially as shown and described.
FIG. 1 is a front perspective view of a convertible sofa embodying my new
design;
FIG. 2 is a front perspective view of a second embodiment of the
convertible sofa shown in FIG. 1;
FIG. 3 is a front perspective view of the convertible sofa shown in FIGS. 1
and 2 converted into a bed or similar unit of furniture; and
FIG. 4 is a front perspective view taken from the opposite side of FIG. 3
of the convertible sofa shown in FIGS. 1 and 2 converted into a bed or
similar unit of furniture.
The rear surfaces of the convertible sofa not visible in FIGS. 1-4 are
substantially plain and unornamented.