Steam cleaning appliances require a substantial amount of power to operate properly. Typically, steam cleaning appliances require around 1,800 Watts of power to sufficiently heat stored water to provide the necessary steam for the cleaning appliance.
Similarly, steam irons require a substantial amount of power to operate properly. Steam irons generally include two heating elements, one to heat the iron and the other to heat water to produce steam. In the United States, the combined amount of electrical power utilized by both heating elements in a steam iron can not exceed, for practical purposes, 1,800 Watts due to UL regulations limiting voltage levels to 120 volts, with a maximum draw of 15 amps at this voltage level.
Given the above-mentioned power constraints, a device that combines a steam cleaner with a steam iron would not be able to draw sufficient power to power the separate heating elements of the combined device. One attempt to overcome this problem is disclosed in European Patent No. EP 0 809 728 B1, but the design shown therein is intended for use in Europe, which has 220 voltage levels and power standards suitably high that provide sufficient power to a device that includes both a steam cleaner and a steam iron.
Presently available combined steam cleaner and steam iron apparatus, such as that device which is described in commonly owned U.S. Pat. No. 6,711,840 incorporated by reference herein, overcomes the aforementioned problem; yet, the design requires a first and a second boiler element. As such, there exists a need for a combined steam cleaner having a reduction of the components necessary to perform the desired function and, thereby, enabled to reduce the cost of the combined apparatus.
Accordingly, it is desirable to provide a simple, low cost, combined steam cleaner and steam iron apparatus designed to properly operate under restricted power requirements.
Generally speaking, in accordance with the invention, a combination steam cleaner and steam iron that includes a steam generator, a steam cleaner and a steam iron is provided. The steam generator includes a boiling device that has a voltage or power control device and a boiler element for boiling water to produce steam, and a first connector for supplying out the steam. The voltage control device includes a resistive circuit wherein the maximum power that the boiler element can receive can be divided down to a predetermine proportion of the maximum power using the resistive circuit within the voltage control device connected in series with the boiler element. The steam cleaner includes a second connector that is attachable to the first connector of the steam generator, and the second connector includes a steam hose that receives the steam output from the steam generator. The steam cleaner also includes a steam nozzle that dispenses the steam and a circuit that is designed to supply power to the boiler element in the steam generator so as to short the voltage control device and provide power at the maximum power to boil the water when the steam cleaner is in use. The steam iron includes an iron heating element and a third connector that is attachable to the first connector of the steam generator. The third connector includes a steam hose that receives steam supplied out from the steam generator when the steam iron is attached, and steam iron also includes a circuit designed to supply power to the iron heating element to heat the steam iron when in use, and the circuit is designed to supply power to the boiler element so that the boiler element is enabled to supply power at the maximum power divided down by the predetermined proportion and the power supplied to the iron heating element is the maximum power reduced by the power supplied to the boiler element.
A power cable extends from the steam generator for receiving a source of power, and the steam generator includes a user controllable power switch for selectively supplying power to the boiler element and a steam release valve for controlling the output of steam from the steam generator through the first connector, and the steam cleaner and the steam iron each includes a respective user controlled on/off steam switch for controlling the steam release valve when the respective device is connected to the steam generator.
A power is supplied to the steam release valve independent of whether power is supplied by the power switch to the boiling device so that steam is controlled to be supplied out from the steam generator independent of control of the boiling device.
Each of the connectors of the steam generator, steam cleaner and steam iron includes respective first, second, third and fourth electrical contacts. Within the steam generator, the power switch supplies power to the first electrical contract, an electrical connection is provided between the second electrical contract a node between the serially connected the voltage control device and boiler element, the steam release valve's return line is electrically connected to the third electrical contact, and the fourth electrical contact is electrically connected to the power cable's return line. Within the steam cleaner, the first and second electrical contacts are shorted together, so as to short circuit the voltage control device and enable the boiler element to supply maximum power. The third and fourth electrical contacts are connected through the user controlled on/off steam switch. Within the steam iron, the first and fourth electrical contacts are connected through the iron heating element, the third and fourth electrical contacts are connected through the user controlled on/off steam switch, and the second electrical contact is left open.
The boiler element is an 1,500 Watt (up to 1,800 Watt) heater and the iron heating element is a 600 Watt heater. About 1,800 Watts of power are drawn during use of the steam cleaner and about 1,800 Watts of power are drawn during use of the steam generator and the steam iron.
A 120 voltage source of power is supplied to the power cable extending from the steam generator, where the steam generator draws less than 15 amps of power during use of the steam cleaner, and the steam generator and the steam iron collectively draw less than 15 amps of power during use of the steam iron.
The steam generator includes a pressostat, a thermostat and a thermofuse serially coupled to the boiler element. The steam generator also includes a top surface designed for use as a resting surface on which either the steam cleaner or the steam iron may be mounted. The top surface is designed to support a heated steam iron.
Accordingly, it is an object of the invention to provide a combined steam cleaner and steam iron apparatus that operates effectively at 15 amps.
It is another object of the invention to provide a combined steam cleaner and steam iron apparatus designed to provide a minimum number of contacts between the various interchangeable components.
Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.
The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.
The following detailed description, given by way of example and not intended to limit the invention solely thereto, will best be appreciated in conjunction with the accompanying drawings, wherein like reference numerals denote like elements and parts, in which:
Steam generating unit 10 receives electrical power via a power cable 16 that is connected to a suitable power receptacle during operation of the apparatus of the invention. Steam generating unit 10 includes within its housing 14 a main on/off switch (with on/off light) 17 and also includes a split heating element 18, which is shown in
Referring back to
Referring to
The switched output from main on/off switch 17 also is supplied to contact A of the steam generator unit's socket 12, and contact B of socket 12 is connected to a node between voltage control device 70 and boiler element 18. The boiler element's 18 return is serially supplied through the safety devices 52, 54 and 56 mentioned above. As further discussed below, power supplied to contact A is routed back through contact B and then to boiler element 18 of the split heating elements of heating element 18 when the steam cleaner 30 is in use. When the steam iron is in use, power supplied to contact A is supplied to an iron element heater 21 disposed within the steam iron 20.
Power is supplied to steam release valve 50, as previously mentioned, and the valve's return line is coupled to contact C of socket 12. Contact D of socket 12 is supplied to the return line. Both steam iron 20 and steam cleaner 30 include respective on/off switches 28 and 36. When either the steam iron or the steam cleaner is connected to steam generating unit 10 (via their respective plugs 24 and 35), switching on the on/off switch (28 or 36) of the attached device (steam iron 20 or steam cleaner 30) completes the circuit through steam release valve 50 thus causing steam to be released from the steam generating unit 10 via hose connection E (also called steam output port) within socket 12 through the particular hose attached (22 or 32) and then to the particular device in use (steam iron 20 or steam cleaner 30). As mentioned above, power is supplied directly (i.e., not switched power) to steam release valve 50 and thus the on/off switch (either 28 or 36) of the attached device (the steam iron or the steam cleaner) controls steam release valve 50 independent of whether power is being supplied to any of the heater elements.
The steam iron 20 contains an electrical circuit as shown in
The steam cleaner 30 also contains an electrical circuit as shown in
The operation of the invention when the steam iron is attached to the steam generating unit will now be described. The steam iron's plug 24 is first attached to the steam generator's socket 12, such as previously mentioned, so that the output of steam release valve 50 is supplied to steam iron hose 22, the switched power output from main on/off switch 17 is supplied to iron element heater 21 within the steam iron 20, and steam release valve 50 is controlled by steam on/off switch 28 also within the steam iron 20. The steam generator 10 is filled with water in a manner well known in the art, and the main on/off switch 17 is manually set to “on” to power both boiler element 18 within the steam generator 10 and to power iron element heater 21 within the steam iron 20. Since contact B′ is left open, voltage control device 70 is serially connected to boiler element 18 and, thereby, the amount of power that the boiler element 18 is enabled to provide is the maximum power (1500 Watts up to 1800 Watts) factored down by the resistive circuit of the voltage control device 70. The amount that the power delivered by boiler element 18 is factor down is dependent upon the design of the resistive circuit (not shown). With the given constraints of 1800 Watts, the factor must be less than or equal to approximately 70% in order for the iron to be supplied with the 700 Watts while the boiler is supplied 1100 Watts, simultaneously. Collectively, the steam generator 10 and the steam iron 20 draw less than 15 amps of power (120 volts). During this time, steam on/off switch 28 on the steam iron is kept off. Boiler element 18 causes the water within the steam generator to boil to produce steam, and iron element heater 21 heats the bottom surface of the steam iron 20. Upon sufficient heating of steam iron 20 by iron element heater 21, ironing is carried out in a manner well known in the art. Likewise, steam produced within steam generator 10 is supplied through the steam iron upon switching steam on/off switch 28 to its on position (or depression of a button or other suitable on/off device). As previously mentioned, during use of steam iron 20, the steam iron may be conveniently placed on the top surface 19 of the steam generator. Upon completion of steam ironing, both main on/off switch 17 and steam on/off switch 28 are set to “off” and plug 24 is removed from the steam generator's socket 12.
To utilize the steam cleaner 30, the steam cleaner's plug 34 is attached to socket 12 of the steam generator. As previously mentioned, such connection provides the switched power (output from main on/off switch 17) to boiler element 18 alone where the voltage control device 70 is shorted out since contacts A″ and B″ are electrically shorted. The effect of this shorting of the circuit around the voltage control device 70 is that the resistance of the voltage control device 70 is eliminated which enables boiler element 18 to provide maximum power of 1500 Watts up to 1800 Watts to the boiler for boiling the water to generate steam. The output of steam release valve 50 is supplied to steam cleaner hose 32, and steam release valve 50 is controlled by steam on/off switch 36 within the steam cleaner 30. The steam generator 10 is filled with water and the main on/off switch 17 is set to on to power boiler element 18 at the maximum power of 1500 Watts up to 1800 Watts. Boiler element 18 draws less than 15 Amps of power (120 volts)). Steam on/off switch 36 on the steam cleaner is initially kept off. Steam cleaning then is achieved by turning steam on/off switch 36 on to supply the steam through the steam cleaner hose 32 and out through nozzle 38. Upon completion, both switches 17 and 36 are turned off and the connectors are detached.
As can be appreciated from the foregoing discussion and designs shown in
While the invention has been particularly shown and described in conjunction with various embodiments thereof, it will be readily appreciated by those of ordinary skill in the art that various changes may be made without departing from the spirit and scope of the invention. For example, the invention has been described as including a housing socket and plugs for the steam cleaner and steam iron. Of course, the particular style of connector used for the steam generator, steam cleaner and steam iron may be different from that discussed herein.
It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above construction without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall there between.
Number | Name | Date | Kind |
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3869815 | Bullock | Mar 1975 | A |
4875301 | Adams | Oct 1989 | A |
5042179 | van der Meer | Aug 1991 | A |
5400462 | Amoretti | Mar 1995 | A |
5581919 | Torma et al. | Dec 1996 | A |
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Number | Date | Country |
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0 197 424 65 | Apr 1999 | DE |
0 809 728 | Dec 1997 | EP |
0 982 429 | Mar 2000 | EP |
0 027 144 01 | Jun 1995 | FR |