The ornamental design for support frame for a child's riding toy or similar article, substantially as shown and described.
FIG. 1 is a perspective view of a support frame for a child's riding toy or
similar article showing my new design, with transverse dowels in normal
position for support;
FIG. 2 is a front elevational view thereof the side opposite being
substantially identical; and,
FIG. 3 is a side elevational view thereof, the side opposite being
substantially a mirror image.