The ornamental design for an adjustable cushiondevice, as shown and described.
FIG. 1 is a perspective view of an adjustable cushion device;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side plan view thereof;
FIG. 4 is a left side plan view thereof;
FIG. 5 is a back plan view thereof;
FIG. 6 is a front plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showings of the figures are for illustrative purposes only and form no part of the claimed design. Applicant reserves the right to amend the application to change the solid lines to dashed lines if applicant decides to claim such an embodiment.
The line-dot-line patterned broken line oval of certain figures indicates what is claimed inside the boundaries of the oval, while the remainder of the drawings is unclaimed.