I claim the ornamental design for a bed frame, as shown and described.
FIG. 1 is a perspective view of a bed frame in accordance with the present invention;
FIG. 2 is a front plan view of the bed frame of FIG. 1;
FIG. 3 is a first side plan view of the bed frame of FIG. 1;
FIG. 4 is a top plan view of the bed frame of FIG. 1;
FIG. 5 is a bottom plan view of the bed frame of FIG. 1;
FIG. 6 is a rear plan view of the bed frame of FIG. 1; and,
FIG. 7 is a second side plan view of the bed frame of FIG. 1.
The bed frame is shown with symbolic break lines. The appearance of any portion of the article between the break lines forms no part of the claimed design.
The broken lines shown in the drawings illustrate portions of the bed frame that form no part of the claimed design.