Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
2000-05-02
2001-07-17
Moore, Chris K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S422200, C015SDIG001, C015S410000
Reexamination Certificate
active
06260235
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to vacuum cleaners.
2. Description of Prior Art
The invention relates more particularly to domestic vacuum cleaners used in offices and in the home. In simplest form the vacuum cleaners comprise an inlet mounted inside a sweeping head and an outlet, or exhaust, connected by a passage. An electrically driven fan is mounted in the passage to draw air through the passage to create a “vacuum” inside the head so that dirt (dust and debris) is drawn into the inlet in use. A filter is mounted between the inlet and the fan to collect the dirt which is retained in a dirt collection chamber for later disposal, as required. The electric motor provided to drive the tan can be powered by an alternating current (AC) or direct current (DC) supply. Normally either an AC or a DC supply is used. AC supply is converted in the vacuum cleaner to a DC supply. It is also possible to use a combined motor that can be operated by both an AC and a DC supply. If an AC to DC convertor or a combined motor is used, the cost and/or bulk (or weight) is significantly increased. This latter problem is especially a concern for hand-holdable vacuum cleaners.
SUMMARY OF THE INVENTION
It is an object of the invention to overcome or at least reduce these problems.
According to the invention there is provided a vacuum cleaner having a passage extending from an inlet is an exhaust, a filter and a dirt collection chamber, in which electric motor driven fan means mounted in the passage is arranged to draw air into the outlet and through the passage, in which there are two motors, one alternating current motor and one direct current motor.
A separate fan may be provided for each motor.
The fans are preferably mounted in series in the passage.
The fan motor may be electrically switchable to operate simultaneously.
REFERENCES:
patent: 4225999 (1980-10-01), Martinec et al.
patent: 5054157 (1991-10-01), Werner et al.
patent: 5134752 (1992-08-01), Shipman
patent: 5375292 (1994-12-01), Bailey
Hoovine Plastic & Electronic Factory Ltd.
Jackson Walker L.L.P.
Moore Chris K.
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