US Patent 8960456 Molded tension rod mechanism with single lock nut

A tension rod mechanism for a tension rod having a second inner shaft slideably received by a first outer shaft and rotatable about a longitudinal axis of the tension rod. An expandable collar is threadingly engaged with a tapered first threaded shaft is configured to be received in the first outer shaft for rotational movement therewith and slidable axial movement relative thereto. A second attachment shaft fixedly connected to the tapered first threaded shaft is configured to be received in the second inner shaft for rotational and slidable axial movement therewith. When the expandable collar is in the first outer shaft and the second attachment shaft is fixedly received in the second inner shaft, a first rotation of the first outer shaft relative to the second inner shaft expands a diameter of the collar fixedly attaching the expandable collar to the first outer shaft for axial movement therewith.