FIG. 1 is a perspective view of a metal bed frame showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image of FIG. 3;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a partial enlarged view of FIG. 1;
FIG. 9 is a partial enlarged view of FIG. 1;
FIG. 10 is a partial enlarged view of FIG. 1;
FIG. 11 is a partial enlarged view of FIG. 1;
FIG. 12 is a partial enlarged view of FIG. 1;
FIG. 13 is a partial enlarged view of FIG. 2;
FIG. 14 is a partial enlarged view of FIG. 2;
FIG. 15 is a partial enlarged view of FIG. 2; and,
FIG. 16 is a partial enlarged view of FIG. 5.
The broken lines used in FIGS. 1, 2, 5, and 8-16 depict enlargement boundary lines that form no part of the claimed design.