Adjustable Rod Clamp

FIG. 1 is a top, front, isometric view of my new ornamental design for an adjustable rod clamp; FIG. 2 is a bottom, front, isometric view of the adjustable rod clamp of FIG. 1 ; FIG. 3 is a front elevational view of the adjustable rod clamp of FIG. 1 ; FIG. 4 is a rear elevational view of the adjustable rod clamp of FIG. 1 ; FIG. 5 is a right side elevational view of the adjustable rod clamp of FIG. 1 ; FIG. 6 is a left side elevational view of the adjustable rod clamp of FIG. 1 ; FIG. 7 is a top plan view of the adjustable rod clamp of FIG. 1 ; and, FIG. 8 is a bottom plan view of the adjustable rod clamp of FIG. 1 . The dash-dash-dash lines are included for the purpose of illustrating portions of the adjustable rod clamp that form no part of the claimed design. The dash-dot-dash lines are included for the purpose of illustrating boundary lines and form no part of the claimed design.