The ornamental design for a portableworkbench, as shown and described.
FIG. 1 is a perspective view of the portable workbench according to the
design of my invention and equipped with two clamping members showing the
two clamping members mutually adjacent so that their respective surfaces
lie in a common substantially horizontal plane.
FIG. 2 is also a perspective view of the portable workbench according to
the design of my invention showing one of the clamping jaws positioned at
an angle with respect to the other one of the clamping jaws.
FIG. 3 is a perspective side elevation view of the portable workbench and
shows the two clamping members mutually adjacent so that the respective
upper surfaces lie in a common substantially horizontal plane.
FIG. 4 is a perspective elevation view of the portable workbench shown in
FIG. 1, wherein the left hand top member has been substituted by a third
top member having a very large surface area.
FIG. 5 is a perspective view of the portable workbench with the leg
assembly in the collapsed position.