Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2000-04-25
2001-07-31
Moore, Chris K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S344000, C015SDIG001
Reexamination Certificate
active
06266846
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to vacuum cleaners.
2. Description of the Prior Art
The invention is particularly but not exclusively related to a hand-holdable vacuum cleaner with a rechargable battery power pack. In normal use an array of bristles are used to brush surfaces and a vacuum applied centrally within the array to suck dust and debris disturbed by the brushing into an inlet in the body of the cleaner for collection and later disposal. Different types of vacuum (sucking) arrangements can be used and are well-known. As the vacuum is applied in effect well inside the array, the actual vacuum (or sucking) is partially wasted due to lateral air flow between the bristles well above the ends of the bristles.
SUMMARY OF THE INVENTION
It is an object of the invention to overcome or at least reduce this problem.
According to the invention there is provided a vacuum cleaner having a housing which has a lower generally planar surface and a central inlet to which a vacuum is applied to draw dust and debris into the housing for collection, a brush head that fits against the planar surface and carries an array of brush bristles surrounding the central inlet with the bristles extending downwards from the planar surface for contacting a brushing surface in use, including a skirt surrounding the inlet that extends downwards inside the array of bristles with a peripheral bottom edge, adjacent the bristles, that can be contacted directly against the brushing surface when the head is pressed sufficiently firmly downwards to laterally flex the bristles.
The array of bristles and the skirt may be rectangularly shaped in plan.
The skirt may be formed of plastics material. The skirt may be formed of flexible material. The skirt may be integrally formed with the brush head.
The skirt is preferably formed with vertical slits to allow the bottom edge to flex so as to conform to non-planar brushing surfaces when required.
REFERENCES:
patent: 673603 (1901-05-01), Harvey
patent: 1345424 (1920-07-01), Wasenska
patent: 2089600 (1937-08-01), Edwards
patent: 2469256 (1949-05-01), Brakman
patent: 2730753 (1956-01-01), Gerber
patent: 3835869 (1974-09-01), Newman et al.
patent: 5386607 (1995-02-01), Sebor
patent: 5706550 (1998-01-01), Holsten
patent: 5850669 (1998-12-01), Schupp et al.
Jackson Walker L.L.P.
Moore Chris K.
Talentone Development Limited
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