The ornamental design for a tourniquet, as shown and described.
FIG. 1 is a front view of a tourniquet, showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a sectional view thereof, taken along line 7-7 in FIG. 1;
FIG. 8 is a partially enlarged view of the portion indicated “8” shown in FIG. 7; and,
FIG. 9 is a perspective view thereof, shown in a state of use.
The broken lines shown in the drawings represent portions of the tourniquet that form no part of the claimed design. The dot-dash broken lines form no part of the claimed design.