The ornamental design for a clampring, as shown and described.
FIG. 1 is a top view of an embodiment of a clamp ring showing our new design, a bottom view opposite the top view being omitted since it is substantially a mirror image of FIG. 1;
FIG. 2 is a side view of the clamp ring shown in FIG. 1, a side view of the opposite side being omitted since it is substantially a mirror image of FIG. 2; and,
FIG. 3 is a cross-sectional view of the clamp ring shown in FIG. 1 taken along line 3-3, a cross-sectional view of the opposite half being omitted since it is substantially a mirror image of FIG. 3.
In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design.