FIG. 1 is a perspective view of a window blind headrail showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is an end elevational view as seen from the right of FIG. 1; and,

FIG. 7 is a cross-sectional view taken on the line 7--7 of FIG. 1 showing the cross-sectional configuration thereof.