Abstract: An expansible chuck for holding hollow cylindrical cores used for winding and unwinding sheet material. A portion of the chuck body nearest the flange is stepped up so that the diameter of the chuck near the flange is slightly larger than the diameter of the rest of the chuck. The stepped up portion centers the chuck within the core which helps the expanding elements to uniformly grip the core.

Abstract: An expansible chuck for holding hollow cylindrical cores used for winding and unwinding sheet material. A portion of the chuck body nearest the flange is stepped up so that the diameter of the chuck near the flange is slightly larger than the diameter of the rest of the chuck. The stepped up portion centers the chuck within the core which helps the expanding elements to uniformly grip the core.

Abstract: An expansible chuck for holding hollow cylindrical cores used for winding and unwinding sheet material. A portion of the chuck body nearest the flange is stepped up so that the diameter of the chuck near the flange is slightly larger than the diameter of the rest of the chuck. The stepped up portion centers the chuck within the core which helps the expanding elements to uniformly grip the core.

Abstract: A core adapter is provided for adapting a larger diameter core to be mounted on a winding machine designed for a smaller diameter core. The core adapter includes a cylindrical body having a wall, a central bore, an outer surface, and a discontinuity in the form of a slit extending axially along and completely through the wall. The core adapter can be inserted in an end of a core and progressively secured by expanding the body, facilitated by a widening of the slit, until the body wedges against the inside surface of the core. Adhesive can be applied to the adapter or the core or both to secure the core adapter in place. The body can be expanded with screws progressively threaded through the core and into the body of the core adapter, or vice versa. Alternatively, the body can be expanded by urging a wedge into the slit to widen the slit and consequently expand the body of the core adapter radially.

Abstract: A core adapter is provided for adapting a larger diameter core to be mounted on a winding machine designed for a smaller diameter core. The core adapter includes a cylindrical body having a wall, a central bore, an outer surface, and a discontinuity in the form of a slit extending axially along and completely through the wall. The core adapter can be inserted in an end of a core and progressively secured by expanding the body, facilitated by a widening of the slit, until the body wedges against the inside surface of the core. Adhesive can be applied to the adapter or the core or both to secure the core adapter in place. The body can be expanded with screws progressively threaded through the core and into the body of the core adapter, or vice versa. Alternatively, the body can be expanded by urging a wedge into the slit to widen the slit and consequently expand the body of the core adapter radially.