The ornamental design for a clampingdevice, as shown and described.
FIG. 1 is a front elevation view of a clamping device showing our new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof,
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top, front and left side perspective view thereof;
FIG. 8 is a top, rear and right side perspective view thereof; and,
FIG. 9 is a top, front and left side perspective view thereof in an alternative position.
The portions of the design shown in broken lines in FIG. 6 are for the purpose of illustrating the environment only and form no part of the claimed design.