The ornamental design for a clampingassembly, as shown and described.
FIG. 1 is a top right isometric view of a clamping assembly;
FIG. 2 is a top right isometric view of a clamping assembly;
FIG. 3 is a front elevation view of a clamping assembly;
FIG. 4 is a rear elevation view of a clamping assembly;
FIG. 5 is a right elevation view of a clamping assembly;
FIG. 6 is a left elevation view of a clamping assembly;
FIG. 7 is a top plan view of a clamping assembly; and,
FIG. 8 is a bottom plan view of a clamping assembly.
A description of the appearance of the article is as follows: The broken lines showing portions of the design in all figures is included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.