Air delivery unit, hose and deploying device therefor

摘要

An expanding and retractably collapsing device includes a generally cylindrical hose which is expandable and retractably collapsible and has formed on a surface thereof a circumferentially extending rib. A roller assembly having rotatable framework is disposed adjacent the hose and has roller bearings disposed in the framework for mechanically engaging the rib such that rotation of the framework in one or another direction causes either expanding or collapsing the hose. The roller assembly is generally axially stationary with respect to an axis about which the hose expands and contracts. An air supply unit is connected to the hose to deliver conditioned air. A remote controller enables operation of the air supply unit and includes a detector for detecting toxic air conditions and generating an alert signal indicating an unsuitable environmental condition.