FIG. 1 is a perspective view of a first embodiment of a seat frame showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front side elevation view thereof;

FIG. 6 is a perspective view of a second embodiment thereof;

FIG. 7 is a right side elevation view thereof;

FIG. 8 is a left side elevation view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a front side elevation view thereof.

The broken lines in the drawings, indicating that no particular shape of the broken line subject matter is being claimed, represent environmental subject matter and form no part of the claimed design. The pairs of adjacently spaced jagged, broken away portions indicate indeterminate length.