We claim the ornamental design for a spool stand, as shown and described.
FIG. 1 is a perspective view of a spool stand according to our design, the spool stand being an assembly of plural pieces stacked one on another;
FIG. 2 is a perspective view of a piece of the spool stand removed for clarity of illustration;
FIG. 3 is a front view of the spool stand;
FIG. 4 is a top plan view of the spool stand;
FIG. 5 is a bottom view of the spool stand;
FIG. 6 is a rear view of the spool stand;
FIG. 7 is a right side view of the spool stand;
FIG. 8 is a left side view of the spool stand;
FIG. 9 is a sectional view of the spool stand taken along line 9-9 in FIG. 4;
FIG. 10 a front view of the spool stand piece of FIG. 2, the rear view being identical to the front view;
FIG. 11 is a top plan view of the spool stand piece of FIG. 2;
FIG. 12 is a bottom view of the spool stand piece of FIG. 2;
FIG. 13 is a right side view of the spool stand piece of FIG. 2, the left side view being identical to the right side view; and,
FIG. 14 is a perspective view of the spool stand as used for holding a plurality of yarn spools, wherein the, broken lines showing the yarn spools are for illustrative-purposes only and form no part of the claimed spool stand.