Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-10-11
1991-12-17
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, A47L 928
Patent
active
050724843
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to suction control devices for vacuum cleaners and, more specifically, to a booster control device to operate the fan motor of a vacuum cleaner at an elevated rate for a predetermined period of time.
From WO-87/01921 a vacuum cleaner is known which is provided with a suction fan driven by an electric motor. The vacuum cleaner is supplied from the mains and is provided with an electronic speed control device by which the suction force of the vacuum cleaner can be set. By actuation of an operating member the vacuum cleaner can be driven at an increased power level, which exceeds the rated maximum power level, during a predetermined time period after which the vacuum cleaner motor is operated to return to its normal power range. In addition, means are provided for preventing the renewed operation in the region not allowed before the lapse of a predetermined time.
SUMMARY OF THE INVENTION
The device described in the publication, usually referred to as a "booster", has a design which is relatively complicated comprising quite a number of electronic components. Therefore, one object of the invention is to provide a booster device performing the same function but having a simpler design.
In addition, the booster device described in the publication presupposes the vacuum cleaner to be operated from the mains. Nowadays, battery operated vacuum cleaners are also being manufactured too and it is a further object of the invention to provide a booster device which can be used also in such application.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described more in detail in connection with two embodiments relating to a mains operated vacuum cleaner and to a battery operated vacuum cleaner, respectively. The description is made with reference to the enclosed drawings, in which:
FIG. 1, schematically, shows a vacuum cleaner;
FIG. 2 is a circuit diagram for a booster device in connection with a mains operated vacuum cleaner;
FIG. 3 is a circuit diagram for a booster device in connection with a battery operated vacuum cleaner.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows, schematically, the construction of a vacuum cleaner. In a housing 10 there are provided an inlet opening 11 and an outlet opening 12. By a suction fan 14, driven by an electric motor 15, an air stream is created between the inlet and outlet openings via a dust container 13. An electronic speed control device 16 is provided by which the suction force can be set for different operating modes. The setting takes place by means of a potentiometer 17 operated by a knob 18. For the switching-in of an extra high suction force, the booster position, a push-button 19 is provided, by means of which the control device is operated.
FIG. 2 shows a circuit diagram for a mains operated vacuum cleaner provided with a booster device according to the invention. The motor, which is a common series motor, is connectable, via terminals 20,21 and a switch 22, to an AC mains, for example for 220 volts. The motor is connected in series with a triac 23 which, in the usual way, is provided with a trigger device comprising a resistor 29, a potentiometer 24, a capacitor 25 and a diac 26. The potentiometer, the resistor and the capacitor form a series circuit which is connected in parallel with the triac 22. The connecting point between the potentiometer and the capacitor is connected, via the diac 26, to the control electrode of the triac 23. A series circuit, formed by a capacitor 27 and a resistor 28, is connected in parallel across the triac, protecting it against transients. By means of the potentiometer 24 the desired trigger angle for the triac 22 can be chosen and by that the speed and the suction force can be varied. The component values of the resistor 29, the potentiometer 24 and the capacitor 25 have been chosen so that the triac is not conducting through the whole of each half period even at the maximal suction force, set by the potentiometer. This means that the
REFERENCES:
patent: 4920607 (1990-05-01), Kohn
patent: 4969229 (1990-11-01), Suanberg et al.
Aktiebolaget Electrolux
Moore Chris K.
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