The ornamental design of a support for a chair, as shown and described.
FIG. 1 is an oblique view of a chair having a vertical support therefor, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is back elevation view thereof;
FIG. 4 is a side elevation view thereof;
FIG. 5 is a side elevation view thereof, showing the side that is opposite the side shown in FIG. 4; and,
FIG. 6 is a top plan view thereof.
The characteristic feature of the design resides in the application of a part having the appearance of an automotive coil spring to a support for a chair.
The parts of the chair other than the support are shown in broken lines for illustration purposes only and form no part of the claimed design.