The ornamental design for a caliperbrakeunit for hand trucks, as shown and described.
FIG. 1 is a perspective view of a caliper brake unit for hand trucks
showing my new design from the top and one end;
FIG. 2 is a perspective view thereof shown from the bottom and opposite
end;
FIG. 3 is a perspective view of a second embodiment of the caliper brake
apparatus for hand trucks showing my new design from the top and one end;
and,
FIG. 4 is a perspective view of the embodiment of FIG. 3 shown from the
bottom and opposite end.