The ornamental design for a cornerclamp, as shown and described.
FIG. 1 is a front elevation view of a corner clamp in accordance with our design;
FIG. 2 is a rear elevation view of the corner clamp of FIG. 1;
FIG. 3 is a top plan view corner clamp of FIG. 1;
FIG. 4 is a bottom plan view corner clamp of FIG. 1;
FIG. 5 is a left side elevation view corner clamp of FIG. 1; and,
FIG. 6 is a right side elevation view corner clamp of FIG. 1.
The broken lines of the drawings illustrate portions of the corner clamp and environment which form no part of the claimed design.
The clamp is shown with a symbolic break in its length. The appearance of any portion of the clamp between the break lines forms no part of the claimed design.