Abstract: A generally cylindrical expansible shaft includes an outer profile, and a generally cylindrical inner body having a longitudinal axis and at least one first coupling element. At least two semi-circular leaf elements may be movably coupled to the first coupling element of the inner body by means of at least one second coupling element. The leaf elements may together substantially form the outer profile of the generally cylindrical expansible shaft. At least one thrusting element may be operatively disposed between the leaf elements and the inner body to move the leaf elements radially outwards relative to the longitudinal axis to increase an outer diameter of the shaft when in a first configuration, and allow the leaf elements to move radially inwards relative to the longitudinal axis to decrease the outer diameter of the shaft when in a second configuration.

Abstract: A cylindrical shaft has a plurality of radially disposed slots extending longitudinally thereof and opening at the outer surface of the shaft. A radially movable mechanism is disposed within each of the slots. Each mechanism is moved outwardly by an expandable tube. One of the slots opens at a side face of the shaft to provide a side opening through which a track can be inserted into and removed from the slot. Springs bias the track radially inwardly. The track includes an open end through which a support can be inserted into and removed from the track. A two piece retainer retains the track and support in operative position. A plurality of core stops are carried by the support and can be either adjustable longitudinally of the support or fixed to the support. The core stops engage side edges of tubular supports disposed around the shaft for spacing the tubular supports for a winding operation.