Chair Back Frame

FIG. 1 is a perspective view of a chair back frame showing my new design;

FIG. 2 is another perspective view of FIG. 1 ;

FIG. 3 is a front view of FIG. 1 ;

FIG. 4 is a rear view of FIG. 1 ;

FIG. 5 is a left side view of FIG. 1 ;

FIG. 6 is a right side view of FIG. 1 ;

FIG. 7 is a top view of FIG. 1 ; and,

FIG. 8 is a bottom view of FIG. 1 .

The broken line portions of the chair back frame in FIGS. 1 - 8 represent portions of the chair back frame and form no part of the claimed design.