Abstract: In the centrifugal fan unit of an upright vacuum cleaner, the improvement of a metal liner to rehabilitate a worn out fan chamber or to improve the performance of a new centrifugal fan unit comprising a metal plate having an overall shape and size as the original fan chamber in its new condition and an assembly for mounting the liner in the chamber comprising a clamp fully manipulative from only one side of the vacuum cleaner base including a squeezable handle, a shaft passing fore and aft through the handle adapted for reciprocating movement relative to the handle, a bar on the shaft to allow it to pass through the base and reversibly abut the opposite side of the first chamber, a fan blank slidingly received on the shaft to abut the liner over substantially its full surface, a spring cooperative with the squeezable handle to draw the bar and fan blank together to squeeze the liner tightly against the base and a lever to release the clamp when the adhesive is set to hold the liner in position.

Abstract: A foot-operated height-adjustment mechanism for retrofit and replacement of the nozzle height-adjustment screw in an upright floor vacuum cleaner of the type characterized by having a front floor cleaning nozzle that is pivotally adjustable in height about the front wheels through raising and lowering the upwardly spring biased rear wheel carrier fork in contact with the screw comprising a threaded hollow tube, for receipt in the empty screw hole, a shaft slideably received in the tube, biased down against the carrier fork, an exposed mounting cap encircling the tube and including an aperture formed in one side thereof tapering inward to expose the shaft, a first lever extending out of the aperture, encircling the shaft and adapted to release the shaft when the other end is pressed down but preventing the shaft from upward movement within the tube when raised, the shaft biased in the upward, locked position, and a second lever adjacent the carrier fork and extending behind the rear wheels and terminating in a

Abstract: An upright-type vacuum cleaner wherein the air pump, traditionally fixed to the bottom motor shaft, is repositioned at the top of the motor shaft and the dirt-laden air duct is directed up over the motor to this top mounted air pump, and a radical change of direction is introduced in the air duct to cause heavy debris fragments, that would normally enter and damage the air pump, to drop out of the incoming air stream into an emptyable receptacle.