A transducer is coupled either directly in a linear relationship, or remotely in an angular relationship, to a focusing element. The transducer and focusing element preferably extend a length at least equal to the diameter of a substrate to be cleaned thereby. The transducer and focusing assembly impart focused megasonic energy to a fluid in contact therewith. Three embodiments of a cleaning system which advantageously employ the transducer/focuser assembly are disclosed. The transducer/focuser ...

A vacuum cleaner capable of exterminating bacteria or bugs that exist in the air sucked into a dust collecting chamber thereof. An exterminating section includes: an operating switch for selecting hot air circulation for exterminating operation; an hot air circulating duct disposed on a rear surface of a front body, connecting an accommodating chamber with a dust collecting chamber of the body, for guiding the air in the accommodating chamber into the dust collecting chamber; and a shutter secti...

An electrostatic air cleaner includes a corona charging section and a precipitation section. The charging section includes a first and a second array of substantially parallel earth wires, each array being disposed in a respective plane substantially perpendicular to the direction of air flow, and a third array of substantially parallel corona wires sandwiched between the first and second arrays. With this design, the spacing between earth wires and the spacing between corona wires can be select...

The invention provides a vacuum cleaner (2) having a cleaner head (8) comprising a dirty air inlet (12) and a passage 20) forming an airflow path for dirty air entering the dirty air inlet (12). Access means (24, 26) are provided for allowing access to the airflow path (20) to facilitate cleaning thereof and or removal of blockages therefrom. A transparent portion is provided in an outer casing (22) of the cleaner head (8) to allow the interior of the airflow path (20) to be visually inspected. ...

A vacuum cleaner head carries an array of brush bristles in conventional fashion. The bristles surround an inlet through which dust and debris are sucked into the vacuum cleaner during normal brushing action. A skirt is mounted inside the bristles so that when the head is pressed sufficiently towards a brushing surfaces a lower edge of the skirt can contact directly against the brushing surface.

A vacuum cleaner wherein a hose, a pipe and a suction nozzle, which are connected to a vacuum cleaner main body incorporating therein a motor fan, are formed with a suction air passage as well as an exhaust air passage for making air exhausted from the motor fan circumfluently flow. The pipe is composed of an inner cylindrical portion having a substantially circular section and forming the suction air passage, and an outer cylindrical portion a part of which is uniformly formed with the inner cy...

A belt cleaner is provided in which scraping portions of scrapers are constantly pressed against a surface of a conveyor belt with uniform force throughout all cleaner units. The belt cleaner includes an array of the plurality of the cleaner units arranged in the transverse direction of the conveyor belt, and a pressure generator for combined with the cleaner units. The pressure generator includes respective support sections which are engaged with corresponding working portions of the scrapers o...

An improved vacuum cleaner having a removable dirt collector inside a substantially enclosed suction compartment is provided with a conditioning pack for deodorizing and/or disinfecting the stored waste matter even when the vacuum cleaner is not in operation. The conditioning pack is mounted on a fixture inside the suction compartment but outside the waste holder of the dirt collector. This arrangement facilitates more effective deodorization and/or disinfecting and, at the same time, easy empty...

The invention provides a vacuum cleaner comprising an airflow path having a dirty air inlet (14) and a clean air outlet (44e), a fan (48) for drawing an airflow along the airflow path from the dirty air inlet (14) to the clean air outlet (44e), a motor (50) for driving the fan (48), separating apparatus (18) for separating dirt and dust from the airflow, a pre-motor filter (32) arranged upstream of the motor (50) and a post-motor filter (42) arranged downstream of the motor (50), wherein both th...

A method for filtering a dirty air stream in a vacuum cleaner to obtain a clean air stream has subjecting the dirty air stream to a first cyclonic separation stage to obtain a partially cleaned air stream and subjecting the partially cleaned air stream to a second cyclonic separation stage and an electronic filtration stage to obtain the clean air stream.