Battery-operated surface treatment apparatus having a booster function
AssigneeAktiebolaget Electrolux
InventorsJoakim A. Svanberg, Lars G. Kilstrom, Lars G. Tuvin, Anders E. C. Larsson
Life of this patent
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Abstract
A battery-operated surface treatment apparatus having a booster function, preferably a vacuum cleaner, comprises an electric motor (10) which drives a treatment unit, such as a suction fan. Further, the apparatus comprises a battery-powered power supply unit (11) for the motor and, in addition, the apparatus is provided with a coupling device (18,23) for the activation of the booster function by temporarily connecting a separate battery (14) in series with the batteries in the power supply unit (11).
Claims6
A battery-operated surface treatment apparatus having a booster function, preferably a vacuum cleaner, comprising a treatment unit driven by an electric motor (10), and a battery-powered supply unit (11) for the motor, characterized by a coupling device (18, 23) arranged to activate the booster function by temporarily connecting a separate battery (14) in series with the batteries for the power supply unit (11), a protecting device (23) being provided to connect the separate battery (14) only if the terminal voltage (U) of said battery exceeds a predetermined value.
A surface treatment apparatus according to any of the preceding claims, characterized in that the batteries of the power supply unit (11) and the separate battery (14), respectively, are rechargeable batteries.
Dependencies are inferred from the claim text.