US Patent 7793384 Retractable central vacuum hose

A retractable hose assembly for a central vacuum system includes a PVC conduit mounted behind a wall within at least one room on each floor of a building. The conduit includes an elbow at a lower end that extends to the outlet of a wall-mounted vacuum receptacle. Received within the conduit is an elongated, length-extendable hose formed of helical spring wire encompassed by a flexible layer. The helical wire allows the hose to be manually extended to approximately six times its collapsed length. When the hose is released, it retracts completely within the conduit with its inlet concealed behind the wall-mounted receptacle. By simply pulling the hose from the conduit, a user can extend it significantly to access one or more rooms on a given level.