I claim the ornamental design for the bed frame, as shown and described.
FIG. 1 is front elevational view of a bed frame showing a new design;
FIG. 2 is a zoomed view of a compartment integral to the bed frame of FIG. 1;
FIG. 3 is a front plan view of the bed frame of FIG. 1;
FIG. 4 is a rear plan view of the bed frame of FIG. 1;
FIG. 5 is left-side plan view of the bed frame of FIG. 1;
FIG. 6 is a right-side plan view of the bed frame of FIG. 1;
FIG. 7 is top plan view of the bed frame of FIG. 1; and,
FIG. 8 is bottom side plan view of the bed frame of FIG. 1.
The broken line showing of a horse in FIGS. 1 and 2 illustrates environment structure of the claimed design. The remaining broken lines shown in the drawings, with the exception of the drafting indication of the detail view, illustrate portions of the bed frame. None of the broken lines form part of the claimed design.