Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-10-11
1992-01-21
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15412, A47L 928
Patent
active
050817388
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for detecting user selected operating mode settings for a vacuum cleaner, and for generating and transmitting corresponding control signals to a motor speed controller. More particularly, the invention relates to the use of such a device in a canister type vacuum cleaner having the operating mode controls disposed on a hose-mounted handle.
In a known vacuum cleaner, presently on the market, the coil and capacitor of the primary circuit are supplied by an oscillator of a frequency coinciding with the resonant frequency of the circuit, maximizing the current in said circuit. In the secondary circuit a load is connected which comprises a number of resistors, corresponding to different operating modes, each of which is connected in series with a manually operable contact. A selected contact brings the desired resistor to be connected in parallel to a series circuit formed by a secondary coil and a capacitor. In this way the primary resonant circuit can be loaded to various degrees, causing the voltage across the primary circuit capacitor to take different identifiable levels. For natural reasons, the number of levels is limited by the fact that said levels have to be identified in a safe way. In practice, problems may arise at a number of levels exceeding four. U.S. Pat. Nos. 4,654,924 and 4,419,783 disclose prior art means for the exchange of information and/or communication of control signals between the vacuum cleaner hose and the body of the vacuum cleaner.
The object of the invention is to eliminate the limitation as to the number of operating levels in a vacuum cleaner of the kind referred to and to provide an arrangement for the detection of a user selected setting of a manual operating member disposed on a hose-mounted handle, each of an arbitrary number of settings having a designated operating mode and a corresponding suction fan motor speed, and for transmitting a corresponding signal to a motor speed controller.
The invention will now be described in detail in connection with a few embodiments with reference to the enclosed drawings, in which:
FIG. 1, schematically shows a vacuum cleaner having a hose and a dust collecting nozzle connected to it;
FIG. 2 is a schematic view of the interior of the vacuum cleaner;
FIG. 3 is a block diagram of a control device for the vacuum cleaner motor, said device being operated from a hose-mounted handle;
FIG. 4 is a timing diagram showing voltages and waveforms appearing in the control device of FIG. 3;
FIG. 5 is a block diagram of a modification of the control device of FIG. 3;
FIG. 6 is a timing diagram for voltages and waveforms appearing in the circuit shown in FIG. 5;
FIG. 7 is a circuit diagram for a practical embodiment of the secondary circuit;
FIG. 8, finally, is a timing diagram of voltage waveforms appearing in the circuit of FIG. 7.
FIG. 1 shows a vacuum cleaner 10 of common design. Via a hose 11, having a hose handle 12 and an extension tube 13, the cleaner is connected to a dust collecting nozzle 14. As shown in FIG. 2, the vacuum cleaner is provided with an inlet opening 15 and an outlet opening 16. By a suction fan 17, driven by an electric motor 18, an air stream is established between said inlet and outlet openings. The air stream passes a dust container 19 in which dust, conveyed with the air stream, is kept. An electronic control device 20 is provided in the vacuum cleaner to make possible operation of motor 18 at various speeds. The control device can be operated by an operating member 21, disposed on the hose handle 12 and being, for instance, a slide switch which can be set into four different positions closing four different contacts, as will be described more in detail below.
The operating member 21 is part of an operating device 22, shown in FIG. 3. By sliding of the operating member the desired contact can be closed. The operating device is interconnected with a logic arrangement 23 which co-operates with a contact 24 in series with a capacitor, connected in parallel with a secondary coil 26 of
REFERENCES:
patent: 4611365 (1986-09-01), Komatsu et al.
patent: 4654924 (1987-04-01), Getz et al.
Edlund Leif E.
Melin Per A.
Schiller Mikael A. W.
Aktiebolaget Electrolux
Moore Chris K.
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