The ornamental design for a vibratorydevice for use on a pair of hangingropes of an exercise apparatus, according to the invention, as shown and described.
FIG. 1 is a front perspective view from above and one side of the vibratory device for use on a pair of hanging ropes of an exercise apparatus, showing my new design;
FIG. 2 is a rear perspective view from below and the other side;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevation view thereof; and,