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The ornamental design for chair base, substantially as shown. |
FIG. 1 is a perspective view of a chair base made in accordance with the design of my invention;
FIG. 2 is a side elevational view of the chair base;
FIG. 3 is a side elevational view of the chair base rotated 45° from the showing in FIG. 2;
FIG. 4 is a top plan view of the chair base with one arm broken away for convenience;
FIG. 5 is a bottom plan view of the chair base;
FIG. 6 is a cross-sectional view taken along plane VI--VI of FIG. 4;
FIG. 7 is a perspective view of an alternative embodiment of my design employing five base arms instead of four;
FIG. 8 is a perspective view of an alternative embodiment of my design;
FIG. 9 is a side elevational view of the alternative embodiment;
FIG. 10 is a side elevational view of the alternative embodiment rotated 45° from the showing in FIG. 9; and
FIG. 11 is a cross-sectional view taken along plane XI--XI of FIG. 8.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
May 22 1978 | Steelcase Inc. | (assignment on the face of the patent) |
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