Abstract: A headrest assembly for an aircraft seat includes a headrest frame having a body portion, a top member interconnected with the headrest frame, a spring clip member interconnected with the top member, a bracket member with a locking rivet, and a headrest tube having a longitudinal slot. The top member includes a plurality of elongated slots and the bracket member is coupled to the headrest frame. The headrest tube is configured to receive the locking rivet in the longitudinal slot in a locked position and thereby lock the headrest tube to the headrest frame.

Abstract: A headrest assembly for an aircraft seat includes a headrest frame having a body portion, a top member interconnected with the headrest frame, a spring clip member interconnected with the top member, a bracket member with a locking rivet, and a headrest tube having a longitudinal slot. The top member includes a plurality of elongated slots and the bracket member is coupled to the headrest frame. The headrest tube is configured to receive the locking rivet in the longitudinal slot in a locked position and thereby lock the headrest tube to the headrest frame.

Abstract: A device for rotating a first structure relative to a second structure has a rotatable shaft for attachment to the first structure. A first cylinder is coaxially attached to the rotatable shaft, and has a plurality of bearing constraining apertures for holding a plurality of bearings. A hollow fixed member for attachment to the second structure has a coaxially attached second cylinder outside of the first cylinder. The second cylinder has a plurality of bearing seats on its inside wall for selectively receiving the bearings. The number of bearing constraining apertures is different from the number of bearing seats, so that the bearings are harmonically aligned by the constraining apertures to be movable to within the bearing seats only at selected progressive locations. A handle is coaxially and rotatably mounted to the fixed member, and carries a cam inside the first and second cylinders.