Abstract: An expendable spool for threads, yarns and the like, having a hub and flanges at both ends of the hub. The flanges are formed by two mirror symmetrical portions with each flange portion having a radial slot for receiving a projection of the other flange portion thereby forming interlockable but separable portions. The hub also comprises two mirror symmetrical portions, each of which is secured to a flange portion at each end so that the spool can be separated into mirror symmetrical halves. The flanges have central apertures and the hub has a central passage which is continuous between the flanges. The inner wall of the hub is provided with ribs having a triangular cross-section, the apices of which lie in a cylindrical surface for securing the hub to a spindle for rotation therewith.

Abstract: A sewing machine bobbin adapted for disposal in a bobbin case. The bobbin includes a hollow cylindrical core on which a thread mass is wound adapted for slidable disposal over a center post mounted in the bobbin case, and a latch is mounted on the post for securing the cylindrical core and the thread mass in the bobbin case, the post and the latch having a combined axial length greater than the axial width of the bobbin case. The improvement of the invention comprises constructing the hollow cylindrical core so that the edge of at least one end thereof is axially tapered radially inwardly along the axis of the core away from its end towards the center post of the bobbin case and has an axial length which is greater than the axial distance between the bobbin case and the latch. The thread mass is wound on the core so that the tapered edge extends axially outwardly along the core axis beyond the surface of the thread mass.