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Publication numberUS3855665 A
Publication typeGrant
Publication dateDec 24, 1974
Filing dateDec 15, 1972
Priority dateDec 28, 1971
Also published asDE2262296A1, US3956688, USRE28920
Publication numberUS 3855665 A, US 3855665A, US-A-3855665, US3855665 A, US3855665A
InventorsO Schwartz
Original AssigneeElectrolux Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Remote control for vacuum cleaner motor
US 3855665 A
Abstract
In a household appliance, such as a vacuum cleaner, a remote control is provided for the vacuum cleaner motor speed as well as the on/off function of the motor. The control unit is low voltage where connected to the operating member and complies with government safety requirements.
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Description  (OCR text may contain errors)

United States Patent [1 91 Schwartz Dec. 24, 1974 REMOTE CONTROL FOR VACUUM CLEANER MOTOR [75] lnventorz' Osten Schwartz, Varmdo, Sweden [73] Assignee: Aktiebolaget Electrolux, Stockholm,

' I Sweden 22 Filed: Dec. l5, 1972 21 Appl. No.: 315,438

[52] US. Cl 15/339, 15/412, 323/24,

' I 323/36 [51] Int. Cl ..'A47l 9/00 [58] Field of Search 15/339, 412; 323/36, 24

[56] ReferencesCited UNITED STATES PATENTS Muskovac 323/36 X 5/1971 Hctland 15/412 UX 1/1972, Wickham et al 15/339 X Primary Examiner-Robert L. Bleutge Assistant Examiner-C. K. Moore [57] ABSTRACT In a household appliance, such as a vacuum cleaner, a remote control is provided for the vacuum cleaner motor speed as well as the on/off function of the movtor. The control unit is low voltage where connected to the operating member and complies with government safety requirements. a

' 2 Claims, 3 Drawing Figures REMOTE CONTROL FOR VACUUM CLEANER.

' MOTOR BACKGROUND OF INVENTION It is considered highly appropriate in household appliances or other. electrical apparatus to provide a power input to the appliance or device which can be controlled at a distance from the appliance or the like.

In a vacuum cleaner with a suction conduit, for example, it would be desirable to provide both a means for selectively connecting and disconnecting the power source to the motor as well as controlling the motor speed at a location where the hose or tubular shaft of the vacuum cleaner is gripped by theuser.

Although a remote motor control for a vacuum cleaner is extremely beneficial, it is difficult to arrange in practice since wires carrying house current would have to be led from the operating member located adja- The present invention relates to a remote control structure fora vacuum cleaner motor or the like which is located in the proximity of the gripping part of the vacuum cleaner.

It is an object of the present invention to provide a low voltage remote control arrangement for a vacuum cleaner motor located near the gripping portion of the device which is both simple in construction and inexpensive to fabricate.

Another object of the present invention is to provide a thyristor device and a phase shifting network controlling the power input to .the motor.

The invention will now be more fully described with reference to the accompanying drawings in which:

FIG. 1 is a perspective view of the vacuum cleaner embodying the remote control device for the motoroperation and speed;

FIG. 2 is a circuit diagram of the arrangement constructed in accordance with the teachings of the present invention; and

FIG. 3 is an enlarged side elevational view of the vacuum cleaner tank.

DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION Referring to FIGS. 1 and 3 of the drawings, the invention is shown in connection with a horizontal type vacuum cleaner 10. It should be understood that it is within the scope of the present invention to utilize the instant arrangement with other vacuum cleaner configurations as well as other household appliances. The vacuum cleaner is provided with a housing section 11 having a front end removable cover 12 and a latch 13. The housing section 11 is also provided with a handle 14. In addition, the housing is provided with a set of rear wheels 15 and a front glider 16 for facilitating movement of the vacuum cleaner housing on the floor 2 or other supporting surface. An outlet opening 17 is illustrated in the rear of the housing section 11. The

I front end cover 12 is provided with an inlet opening 18 through which dust-laden air flows into the housing 1 1. A dust container or bag 19 is removably affixed to the inlet opening 18in the front end cover12 and functions to separate dirt from air.

The flow of air through the housing section 11 is caused by a motor and fan unit 20 in which a centrifugal fan'21 is arranged at one end of the electric motor 22. The latter is preferably resiliently mounted at 23 in any suitable manner. Inthe normal operation of the motor and fan unit, the fan 21 receives air which has passed through the dust bag 19 and is substantially free of dust and dirt. The air is discharged from the fan 21 through the motor 22 and finally passes through the rear outlet opening 17 of the housing section 11.

As seen in FIG. 1, a flexible suction hose 26 is removably connected at one end to the inlet opening 18 of the housing section 11. Suitable cleaning appliances such as a nozzle 28 may be connected to a tube or wand 30 which in turn is connected to the outer free end of hose 26. The tubes 30 may be constituted of several interconnected sections in which the overall length of the tube can be selectively increased or diminished.

The end of the hose 26 that is remote from the vacuum cleaner 10 is provided with a coupling to the tube 30 which also functions as a grip 32 for manipulating the vacuum cleaner hose 26, and its associated tube 30. As seenin FIGS. 1 and 3, a rotatable knob 34 is shown mounted on the exterior of the grip 32 and easily reached by a person handling the grip. The knob is opveratively connected to a variable resistor 36 housed internally in the grip 32. The electrical conductors 38 are encased in an insulated sheath 40 and have a series of insulated mountings 42 positioned at intervals along the hose 26. The conductors 38 connect the variable resistor 36 to the circuit T shown in FIGS. 2 and 3.

As seen in the circuit diagram of FIG. 2, a vacuum cleaner motor 44 has power supplied to it from an alternating current source 46 through a symmetric thyrister 48, which is also known as a triac. The control electrode or gate 49 of the thyristor 48 is connected to a diac 50, which is a bidirectional symmetric diode, which in turn is coupled to a phase-shifting network including a resistor 51 and a capacitor 52.

Sincethe motor 44 is an inductive load, a compensating network comprising a resistor 53 and a capacitor 54 is included in the circuit.

A step-down transformer 55 is shown connected in the circuit in which the primary winding 56 is coupled tothe phase-shifting network comprising a resistor 51 and a capacitor 52. The conductors 38, which are low voltage conductors hereinbefore referred to, couple the secondary winding 57 of the transformer 55 to the variable resistor 36. The latter is in turn connected to the operating knob 34 on the grip 32. It should be noted that the number of turns of the secondary winding 57 is such that the magnitude of the voltage in the low voltage circuit 57, 38, 36 is maintained at a continuously low value.

If the resistance of the resistor 36 is varied, a change of impedance at the primary side of the transformer 55 is effected. Thus, the primary winding 56 will function as a variable impedance coupled to the phase-shifting network that controls the firing times of the thyristor 48, and by variation of resistance of the variable resispled to the phase-shifting network in such a manner that the impedance of the p rimary winding 56 will be connected in parallel with the capacitor 52. A desirable I result of this parallel circuit is an advantageous 'curve shape of the control pulses of the thyristor 48.

It should be readily apparent that when the present vacuum cleaner is in use, the speed of the vacuum cleaner motor and hence the suction capability of the apparatus can be regulated easily by the rotatable knob 34 mounted on the grip 32. Furthermore, the motor 44 can be started and stopped by means of the knob 34. The present construction is a great convenience to the user in that it is not required to bend toward the vacuum cleaner housing 11 each time in order to regulate or stop start the apparatus.

The present invention provided an extremely simple but reliable arrangement for control of motor speed by low voltage. Furthermore, the operating circuit of the apparatus can also be a very simple design while still fulfilling the safety requirements prescribed by law.

in the claims the word floor in the expression floor-care is intended not only to cover floors but also surfaces like rugs, carpets and other floor coverings, for example.

Whatis claimed is:

1. A remote control arrangement for a vacuum cleaner provided with a motor having an electrical energy source, a flexible hose, a cleaning appliance, a

coupling means operatively connecting the flexible hose with the cleaning appliance, said coupling means also functioning as a hand grip comprising a. an electrical circuitadapted to connect the source of electrical energy to'the motor and including 1. a thyristor device provided with a phase shifting network controlling the power input to the movtor,

2. a standard type transformer generating a conventional hysteresis curve in which the primary winding thereof is a first variable impedance that is a part of the phase shifting network,

3. a second variable impedance including the secondary winding of the transformer and a variable resistor located at a distance from the motor, an operating member for the variable resistor located on said hand grip, and a low voltage conduit positioned on said hose coupling the variable resistor to the secondary winding of the transformer,

4. the magnitude of the first variable impedance which affects the phase shifting network being dependent upon and changeable by the second variable impedance,

5. said phase shifting network including a capacitor coupled in parallel to the primary winding of said transformer whereby a desirable curve shape of said control pulses of said thyristor is produced.

2. The arrangement as claimed in claim 1 wherein the operating member is a rotatable knob.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3417320 *Mar 31, 1966Dec 17, 1968Sprague Electric CoLow noise control circuit
US3579706 *Nov 12, 1968May 25, 1971Whirlpool CoVacuum cleaner motor control
US3636285 *Aug 7, 1969Jan 18, 1972Dayco CorpVacuum cleaner hose assembly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4031458 *Mar 12, 1976Jun 21, 1977Olympus Optical Co., Ltd.A.C. voltage regulator employing thyristor
US4370777 *Nov 28, 1980Feb 1, 1983Duepro AgElectric motor control for vacuum cleaner
US4419783 *May 13, 1982Dec 13, 1983Aktiebolaget ElectroluxRemote control for a vacuum cleaner motor
US4611365 *Feb 10, 1984Sep 16, 1986Matsushita Electric Industrial Co., Ltd.Vacuum cleaner
US5274878 *Jul 23, 1991Jan 4, 1994Cen-Tec Systems Inc.Remote control system for central vacuum systems
US5283922 *Sep 2, 1992Feb 8, 1994Horst K Lunder GmbhPipe cleaning tool
US5363534 *May 25, 1993Nov 15, 1994U.S. Philips CorporationVacuum cleaner and suction tube for use with a vacuum cleaner
US6212732 *Mar 15, 1995Apr 10, 2001Hitachi, Ltd.Vacuum cleaner and suction nozzle body therefor
US6239576 *Sep 3, 1999May 29, 2001Beamco, Inc.Safe Class-2 motor control circuit and method adapted for electric vacuum cleaning system suction motor and agitator motor control
US6282749Apr 3, 2000Sep 4, 2001Hitachi, Ltd.Vacuum cleaner and suction nozzle body thereof cross reference to related application
US6324722 *Aug 24, 1999Dec 4, 2001Toshiba Tec Kabushiki KaishaVacuum-cleaner with recirculation of exhaust air
US7403360Sep 9, 2004Jul 22, 2008Cube Investments LimitedCentral vacuum cleaning system control subsystems
US7712182Jul 23, 2004May 11, 2010Milwaukee Electric Tool CorporationAir flow-producing device, such as a vacuum cleaner or a blower
US7900315Oct 7, 2005Mar 8, 2011Cube Investments LimitedIntegrated central vacuum cleaner suction device and control
US7958594Oct 6, 2006Jun 14, 2011Cube Investments LimitedCentral vacuum cleaner cross-controls
US8096014Mar 4, 2010Jan 17, 2012Cube Investments LimitedCentral vacuum cleaner control, unit and system with contaminant sensor
US8516653Sep 16, 2005Aug 27, 2013Cube Investments LimitedCleaner handle and cleaner handle housing sections
US8732895Oct 6, 2006May 27, 2014Cube Investments LimitedCentral vacuum cleaner multiple vacuum source control
DE2734051A1 *Jul 28, 1977Feb 15, 1979Licentia GmbhStaubsauger
DE3222458A1 *Jun 15, 1982Jan 20, 1983Electrolux AbFernsteuerung fuer einen staubsaugermotor
DE102011004295A1 *Feb 17, 2011Aug 23, 2012BSH Bosch und Siemens Hausgeräte GmbHRemote control unit for floor cleaning appliance, has control unit that is arranged at handle of floor cleaning appliance, where manually operable operating unit is provided for controlling fan motor of floor cleaning appliance
DE102011004295B4 *Feb 17, 2011Sep 5, 2013BSH Bosch und Siemens Hausgeräte GmbHFernbetätigungseinrichtung für ein Bodenreinigungsgerät, Bodenreinigungsgerät und Verfahren zum Betrieb eines Bodenreinigungsgeräts
EP0005218A2 *Apr 19, 1979Nov 14, 1979Siemens AktiengesellschaftVacuum cleaner with a device for regulating the rotation speed of the motor-fan unit
WO1996025788A1 *Jan 29, 1996Aug 22, 1996Philips Electronics NvDevice for converting a resistance value into a control signal which depends on the resistance value, and electrical apparatus comprising such a device
Classifications
U.S. Classification15/339, 15/412, 323/320
International ClassificationH02P7/285, A47L9/28, H02P25/14, H02P7/292, H02P25/10
Cooperative ClassificationA47L9/2842, H02P25/14, Y10S388/919, A47L9/2857, A47L9/2894, H02P7/285
European ClassificationA47L9/28T, A47L9/28D2, A47L9/28F, H02P25/14, H02P7/285