Turbulence, Opti and Level Sensing
Publication Date: 2010-Oct-06
The IP.com Prior Art Database
The present invention relates to electrical appliances and components therefor. Some aspects of the invention are directed to cordless electrical appliances. Some aspects are directed to water temperature sensing and other aspects are directed to liquid level sensors for liquid vessels.
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Field of the Invention
The present invention relates to electrical appliances and components therefor. Some aspects of the invention are directed to cordless electrical appliances. Other aspects are directed to liquid level sensors for liquid vessels.
Background of the Invention
In a cordless appliance, the appliance proper includes a cordless connector that is operable to cooperate with a corresponding cordless connector on a power base. Thus, when the appliance proper is mounted on the power base, power may be supplied to the appliance proper. Such arrangements allow a power base to be connected to a domestic power supply
(such as by a plug), whilst further allowing the appliance proper to be removed from the base for various operations, such as dispensing heated liquid from a cordless liquid heating appliance. The above types of cordless electrical connectors have also found use on other domestic appliances, such as food processors, blenders and the like. This arrangement provides an advantage that the processed/blended food can be more easily dispensed by a
360° cordless connectors, as described for example in WO-A-94/06185, allow the appliance proper to be rotated freely relative to the power base, so that the appliance proper may be positioned on the power base with any azimuthal orientation.
However, as will be appreciated, appliances such as food processors, blenders and,
to a lesser extent kettle jugs, need regular cleaning. In particular, cordless appliances for containing food or liquids other than water require cleaning after each use. Such a task is time consuming and may be difficult to perform manually.
It would be desirable to provide a cordless appliance where the detachable part of the appliance can be washed in a dishwasher, by immersion in water or otherwise easily
cleaned. Sealing arrangements for such a washproof appliance are disclosed in WO-A- 09/109762.
It would be preferable to minimize the components in the appliance proper that need to be sealed, such as electrical components. For example, electrical power switching components may be located in the power base, but this requires some means of signalling
the state of the appliance proper to the power base, so that power may be switched in response to the state of the appliance proper.
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One way of signalling from the appliance proper to the power base is to provide additional electrical contacts therebetween, for example as disclosed in GB-A-2378818 or in WO-A-01/282294. However, these additional contacts must themselves be sealed if the appliance proper is to be washable. Moreover, any debris on the low voltage contacts may prevent electrical contact from being made, and the debris will not be burnt away as might
occur on high-voltage contacts.
WO-A-2008/155538 discloses a cordless appliance with wireless signalling between the applia...