Office Chair Base

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

FIG. 2 is a rear and bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged perspective view of detail “ 9 ” identified in FIG. 1 ; and,

FIG. 10 is an enlarged perspective view of detail “ 10 ” identified in FIG. 2 .

The dashed lines in the figures illustrate portions of the office chair base that form no part of the claimed design. The dash dot dash lines in FIGS. 1 , 2 , 9 and 10 are for the purpose of depicting the boundary lines of the enlarged views and form no part of the claimed design.