Abstract: A motorized power head for a machine for cleaning upholstery, carpeting or hard floors includes a spray nozzle for distributing a clean spray solution on a selected area enclosed by the power head. A cylindrical rotating brush is driven by a two-speed motor housed in the power head to work the solution into the carpet to clean the selected area. A suction nozzle picks up the spent solution together with loosened dirt and grime. The power head may be used as a close-up applicator with a handle adjacent the power head, or as a stand-up applicator with an extension inserted between the handle and the power head. The brush is easily removed for replacement or for converting the apparatus for different applications.

Abstract: A portable carpet cleaning machine has a tank for storing a cleaning solution and a hand-actuatable spray nozzle for applying the solution under pressure. A vacuum motor drives a fan which produces a vacuum in a recovery tank for storing spent solution. Air flows through the recovery tank and the vacuum fan to exhaust. A fast-acting, heat-sensitive thermostatic switch is connected in electrical circuit and in heat transfer relation with the vacuum motor winding to interrupt the flow of current in the motor winding immediately upon sensing a temperature rise in the winding above a predetermined temperature and in a very short time after overflow water is passed from the recovery tank to the vacuum fan.