Adjustable Stand Base

FIG. 1 is a front, right and bottom perspective view of a adjustable stand base showing my new design;

FIG. 2 is a rear, left and top perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view of FIG. 2 with the stand stowed.

The broken lines in the figures illustrate portions of the adjustable stand base that form no part of the claimed design.