We claim the ornamental design for a binder hinge, as shown and described.
FIG. 1 is a perspective view of the binder hinge embodying the present invention.
FIG. 2 is a rear view of the binder hinge of FIG. 1.
FIG. 3 is a side view of the binder hinge of FIG. 1; and,
FIG. 4 is an end view of the binder hinge of FIG. 1.
The portions of the binder shown in dot-dash-dot lines define the boundary of the claimed design and form no part of the claimed design. The portions of the binder shown in dashed lines illustrate environment and form no part of the claimed design. The side view opposite FIG. 3 is a mirror image of FIG. 3 and is not shown. The end view opposite FIG. 4 is a mirror image of FIG. 4 and is not shown.