FIG. 1 is a front view of a joystick according to the present invention.

FIG. 2 is a rear view of the joystick of FIG. 1.

FIG. 3 is a top view of the joystick of FIG. 1.

FIG. 4 is a bottom view of the joystick of FIG. 1.

FIG. 5 is a left side view of the joystick of FIG. 1.

FIG. 6 is a front perspective view of the joystick of FIG. 1.

FIG. 7 is a rear perspective view of the joystick of FIG. 1.

FIG. 8 is a high-angle front perspective view of the joystick of FIG. 1.

FIG. 9 is a cross-sectional view taken along line 9—9 of the joystick of FIG. 1.

FIG. 10 is a cross-sectional view taken along line 10—10 of the joystick of FIG. 5.

FIG. 11 is a cross-sectional view taken along line 11—11 of the joystick of FIG. 5.

FIG. 12 is a cross-sectional view taken along line 12—12 of the joystick of FIG. 5.

FIG. 13 is a cross-sectional view taken along line 13—13 of the joystick of FIG. 8; and,

FIG. 14 is another left side view of the joystick of FIG. 1.

The single-dot dashed lines in FIGS. 1-14 delineate the boundary of the claimed design. The dashed lines in FIGS. 1-14 illustrate electrical control devices, fasteners and a base, and form no part of the claimed design. The right side of the joystick according to the present invention is a mirror image of the left side of the joystick, as illustrated in FIG. 5, for example, and is thus omitted. The cross-sectional views presented in FIGS. 9-13 illustrate the exact contours and configurations of the exterior surfaces at the respective cut lines which are not apparent from the other exterior views.