The ornamental design for an leveractuator, as shown and described.
FIG. 1 is a top plan view of a lever actuator showing our new design;
FIG. 2 is a bottom elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a top perspective view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The bottom views, as seen in 2 and 8 of the combination handle and handle-housing are not claimed. The figures are submitted for informational purposes and do not form part of the claimed combination.