The ornamental design for a liftingdevice, as shown and described.
FIG. 1 is a front perspective view of a lifting device showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a perspective view of the locking pin, shown separated from the lifting device for convenience of illustration.
The broken lines appearing in FIGS. 1 through 4 are intended to denote a chain, a band, a cord or a similar element used to couple the bolt to the lifting device after the bolt has been removed from the hole of the load receiver.