I claim the ornamental design for an adjustable bar clamp, as shown and described.
FIG. 1 is a left perspective view of my new design for an adjustable bar clamp;
FIG. 2 is a right perspective view thereof;
FIG. 3 is a left exploded view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right perspective view of the clamp insert;
FIG. 8 is a left perspective view thereof; and,
FIG. 9 is a rear perspective view of the adjustable bar clamp in a state of use.
The broken lines in FIGS. 1-8 depict portions of the adjustable bar clamp that form no part of the claimed design. Additional broken lines in FIGS. 3 and 9 depict environment of the adjustable bar clamp and form no part of the claimed design.