Umbrella Base

FIG. 1 is a front, right, and top perspective view of an umbrella base, showing my new design;

FIG. 2 is a rear, left, and bottom 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 four umbrella bases when they are put together.

The broken lines in the drawings depict environmental structure of the umbrella base that form no part of the claimed design.