Apparatus for conducting air into bags of vacuum cleaners

摘要

Contoured exhaust ducts for transmitting a particulate-laden airstream from a conduit into a vacuum cleaner bag of an upright vacuum cleaner are disclosed. In one embodiment, the airstream is turned by a transitional section of the exhaust duct by about 90 degrees. The interior of the exhaust duct is smoothly contoured through such transition for avoiding the generation of excessive noise and turbulence. The contoured surface of the transitional section prevents heavy objects entrained in the airstream from rebounding back in a direction against the airflow. The cross-sectional area of the exhaust duct may be maintained constant despite a change in cross-sectional shape from the inlet to the outlet thereof.