Patent Document ID: 9248360
Application ID: 14693309
Patent Flag: 1

Claim One:
1. A training device for attachment to a resistance training machine, including: a ball having an external layer surrounding an interior volume of injected and cured foam material, the external layer defining an opening therethrough; an elongate shaft disposed within the ball and being surrounded by the foam, the elongate shaft being axially aligned with the opening, the elongate shaft having a first end near the opening with a threaded portion, and a second, distal end disposed within and surrounded by the injected and cured foam material; an anchor affixed to the elongate shaft within the ball, the anchor being surrounded by the injected and cured foam material, wherein the anchor urges against the injected and cured foam material when an axial tensile force or rotational force is applied to the elongate shaft with respect to the external layer of the ball; a coupling having a first end for attaching the training device to a cable of the resistance training machine, and a second end including a threaded portion for attaching the coupling to the threaded portion of the elongate shaft; a first annular structural member coaxially disposed with respect to the elongate shaft and disposed against an exterior surface of the external layer of the ball, the first annular structure including a domed cap to seal the opening of the ball; and a second annular structural member disposed coaxially with respect to the elongate shaft and against an inner surface of the external layer of the ball, wherein advancement of a threaded portion of a third annular structural member urging against the domed cap disposed on the elongate shaft causes the external layer of the ball to be pinched about a periphery of the opening between the first annular structural member and second annular structural member, at least two of the second annular structural member, third annual structural member, and domed cap of the first annular structure having the same outer diameter.