Elbow coupling

FIG. 1 is a perspective view of a first embodiment of our design for an elbow coupling;

FIG. 2 is a top view of the elbow coupling shown in FIG. 1;

FIG. 3 is a bottom view of the elbow coupling shown in FIG. 1;

FIG. 4 is a left side view of the elbow coupling shown in FIG. 1, the right side being shown in perspective in FIG. 1;

FIG. 5 is a front view of the elbow coupling shown in FIG. 1;

FIG. 6 is a rear view of the elbow coupling shown in FIG. 1;

FIG. 7 is a perspective view of a second embodiment of our design for an elbow coupling;

FIG. 8 is a top view of the elbow coupling shown in FIG. 7;

FIG. 9 is a bottom view of the elbow coupling shown in FIG. 7;

FIG. 10 is a left side view of the elbow coupling shown in FIG. 7, the right side being shown in perspective in FIG. 7;

FIG. 11 is a front view of the elbow coupling shown in FIG. 7; and,

FIG. 12 is a rear view of the elbow coupling shown in FIG. 7.

The broken lines in FIGS. 7, 9 and 11 are shown for illustrative purposes only and form no part of the claimed design.