US Patent 8408869 Fan assembly

A pedestal for a fan assembly includes a telescopic duct for conveying an air flow to an outlet of the fan assembly. The duct includes an outer tubular member having a first stop member, an inner tubular member located at least partially within and slidable relative to the outer tubular member, the inner tubular member having a second stop member for engaging the first stop member to inhibit withdrawal of the inner tubular member from the outer tubular member, and a mainspring rotatably mounted on the second stop member, the mainspring having a free end retained by the first stop member.