Bushing-Mounted Drag Chain

The figure illustrates a chair-base mechanism with a bushing-mounted drag chain. The bushing-mount design provides for one end of the drag chain to be free to pivot; this provision makes it possible to wrap the drag chain to a radius smaller than that achievable in mechanisms previously designed for the same purpose. The utility of mechanisms like this one lies in applications in which rotation of machinery involves significant turning radii, so that bending of cables that run through drag chains involve relatively tight arcs.