Chair Frame

FIG. 1 is a front right perspective view of a chair frame, showing the design;

FIG. 2 is a back right perspective view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings illustrate portions of the article that form no part of the claimed design.