Patent attributes
A drum assembly having a post, and first and second spoke frames. Each of the first and second spoke frames includes expandable spokes and immovable spokes, extending away from the post. Each expandable spoke includes a distal end movable between a retracted position and an extended position. A plurality of first drum segments each are mounted to the distal end of one of the expandable spokes of the first spoke frame and to the distal end of one of the expandable spokes of the second spoke frame. A plurality of second drum segments each mounted to an end of one of the immovable spokes of the first spoke frame and to an end of one of the immovable spokes of the second spoke frame. Mechanical actuators, extending between the post and either the expandable spokes or the first drum segments, move the expandable spokes between the retracted and extended positions.
