Power base for a removable appliance part

Abstract

A power base (4) comprises an upper part (8) and a separate lower part (10), arranged below the upper part (8). The upper part (8) is configured to receive, in use, a removable appliance part (6) thereon. A weight sensor (34) is arranged between the upper and lower parts (8, 10), and a power supply cable (12) is configured to supply the power base (4) with electrical power. The power base (4) further comprises a cable securing means (28) configured to secure the power supply cable (12) to the lower part (10).

Description

[0001] Power Base For A Removable Appliance Part

[0002] The present invention relates to a power base and to an electrical appliance comprising such a power base.

[0003] Some prior art countertop water heating appliances comprise a means for measuring the weight of the water contained in the appliance. The measured weight can be used to provide an indication to a user as to how much water is in the appliance. This may allow a user to determine whether the appliance needs to be refilled, for example prior to operation. Some water heating appliances are in the form of cordless liquid heating appliances which comprise a removable appliance part, e.g. a liquid heating vessel, which is removably seated on a power base. In such examples, the power base may comprise a weight sensor capable of measuring the weight of the removable appliance part when it is seated thereon. Through knowledge of the weight of the removable appliance part without any contents therein, the weight of the contents may be determined.

[0004] The Applicant has recognized that in some prior art examples, the weight sensor may not always accurately measure the weight of the removable appliance part, and as a result may provide an inaccurate indication of the contents of the removable appliance part. Specifically, the Applicant has recognized that in prior art appliances various forces can act to distort the measured weight. For example, cordless appliances typically comprise cordless electrical connector in the power base and a corresponding cordless electrical adaptor in the removable appliance part. Such connectors and adaptors typically comprise resiliently biased electrical contacts which apply a force to the other of the connector and the adaptor when they are mated together. Such forces can impact the weight measured by the weight sensor, depending on the positioning of the removable appliance part relative to the power base. In a similar manner, the power supply cable which typically extends from the power base may be relatively inflexible and thus, when arranged in at least some positions, it may apply a vertical force to the power base, which may distort the measurement obtained from a weight sensor arranged in the power base.

[0005] The present invention aims to address, or at least mitigate, at least one of the problems outlined above. When viewed from a first aspect, the present invention provides a power base for receiving a removable appliance part thereon, the power base comprising: an upper part configured to receive, in use, the removable appliance part thereon; a lower part, separate to the upper part, arranged below the upper part; a weight sensor arranged between the upper part and the lower part; a power supply cable configured to supply the power base with electrical power; and a cable securing means configured to secure the power supply cable to the lower part.

[0006] The Applicant has appreciated that the specific structure of the power base according to the first aspect of the present invention may facilitate more accurate measurement of the weight of a removable appliance part received, in use, on the power base. The power base may thus be able to determine the weight of the contents of the removable appliance part more accurately.

[0007] Specifically, the cable securing means, which functions to secure the power supply cable to the lower part, may advantageously prevent any forces from the power supply cable from being transferred to the weight sensor which would otherwise impact the weight measured by the weight sensor. When the removable appliance part is seated on the upper part, the weight of the removable appliance part is transferred through the upper part to the weight sensor arranged between the upper and lower parts. As the power supply cable is secured to the lower part, any forces applied by the power supply cable will be applied to the lower part and may not impact the output of the weight sensor, as this is arranged between the lower part and the upper part. Securing the power supply cable in this manner thus isolates any forces which it applies to the power base.

[0008] In some embodiments, the cable securing means is configured to secure the power supply cable at a position along the length of the power supply cable which is spaced from a point of electrical connection between the power supply cable and an electrical component of the power base. In other words, the cable securing means secures the power supply cable at a position along its length spaced apart from the electrical terminations of the power supply cable. In some embodiments, the electrical component may comprise a cordless electrical connector. The power supply cable may comprise a plurality of conductive cores surrounding by a common outer sheath. Each of the of the conductive cores may comprise a termination (i.e. an exposed electrically conductive end) which is connected to an electrical component of the power base. For example, the terminations may be connected to a terminal block, or be soldered to a circuit board. The cable securing means may secure against (i.e. apply a force to) the common outer sheath.

[0009] As the power base is configured to receive the removable appliance part in use, the removable appliance part may be considered to be a physically separate component to the power base, which can be placed onto the power base during use. The power base may be a power base for supplying power to any suitable removable appliance part. The power base may be configured to supply inductive power to a removable appliance part. As such, the power base may comprise an inductive heater, e.g. in the form of induction coil. In such embodiments, the removable appliance part may comprise a susceptor configured to generate heat when experiencing a magnetic field generated by the inductive heater.

[0010] However, in set of embodiments, the power base comprises a cordless electrical connector for providing an electrical connection to the removable appliance part when seated on the power base, wherein the cordless electrical connector extends from the upper part and is positioned so as to mate with a corresponding cordless electrical adaptor on the removable appliance part when it is received thereon. As discussed above, the cordless electrical connector, and indeed the corresponding adaptor in the removable appliance part, may comprise at least one resiliently biased component that acts between the connector and the adaptor. The resiliently biased component may, for example, be a resiliently biased electrical contact. When the removable appliance part is seated on the power base, the at least one resiliently biased component may generate a force acting between the connector and the adaptor. The arrangement of the weight sensor between the upper part and the lower part, in combination with the cordless connector extending from the upper part, advantageously means that forces that arise between the connector and the adaptor when the appliance part is seated on the upper part do not impact the weight measured by the weight sensor. The power base may thus be able to more accurately measure the weight of the removable appliance part.

[0011] In embodiments in which the cordless electrical connector is configured to mate with a corresponding cordless electrical adaptor on an appliance part, the power base may be considered to be a cordless power base as it provides an electrical connection to the appliance part in a cordless manner.

[0012] As a removable appliance part may be received, i.e. seated or stood on, the power base during use, the power base may be considered to be a power base stand.

[0013] The power base may be configured to receive any suitable removable appliance part. In some embodiments, the removable appliance part is a liquid heating vessel. The liquid heating vessel may comprise a chamber for receiving a liquid, e.g. water. Measurement of the weight of the removable appliance part may thus be indicative of the weight of the liquid contained within the chamber. In such embodiments, the liquid heating vessel may comprise a heating element configured to heat the contents thereof, e.g. of the chamber. The cable securing means which secures the power supply cable to the lower part may take any suitable form. In a set of embodiments, the cable securing means is integrally formed with the lower part. For example, the cable securing means may comprise at least one cable securing feature which is integrally moulded with the lower part. The cable securing feature may, for example, comprise a latch which may act to hold the power supply cable against the lower part. The provision of an integrally formed cable securing means may reduce the overall number of parts required to manufacture the power base and may simplify assembly of the power base.

[0014] However, it is not essential for the cable securing means to be integrally formed with the lower part. Thus, in an alternative set of embodiments, the cable securing means comprises a clamping element configured to be attached to the lower part so as to secure the power supply cable to the lower part. The clamping element may be attached to the lower part in any suitable manner. The clamping element may, for example, be attached to the lower part using at least one, e.g. two, screw(s). In a set of embodiments, the clamping element and / or the lower part, may comprise at least one retention feature configured to attach the clamping element to the lower part. For example, the clamping element may comprise a latch feature configured to engage the lower part in a manner in which holds the clamping element against the lower part. The use of such a retention feature may reduce the number of parts required to manufacture the power base and may also reduce the time required to assemble the power base. In addition to the above, through the use of a separate clamping element, the moulding of the lower part may be less complex, as compared to an integrally formed cable securing means, which may thus reduce the cost of the lower part and potentially the power base.

[0015] In some embodiments, the cable securing means may be shaped to suitably secure the power supply cable against the lower part. For example, the clamping element may be shaped to receive the power supply cable therein. For example, the clamping element may comprise a curved portion shaped to extend at least partially around the power supply cable. Such a curved portion may increase the amount of contact between the clamping element and the power supply cable, which may hold the power supply cable in a more secure manner. In a set of embodiments, the lower part comprises a cable receiving portion, integrally formed therein, shaped to receive the power supply cable. The cable receiving portion may have a shape that corresponds to the shape of the power supply cable. For example, if the power supply cable has a generally circular, e.g. circular, cross-section, the cable receiving portion may be circularly shaped, or at least have a curved portion which follows the profile of a circle. The cable receiving portion may comprise an opening in a wall of the lower part into which the power supply cable can be inserted. The cable receiving portion may be dimensioned so as to be substantially the same, e.g. the same, size as the power supply cable. The provision of a cable receiving portion may minimize the amount to which the power supply cable can move relative to the lower part and thus prevent the transmission of forces from the power supply cable to other parts of the power base.

[0016] The cable securing means may secure the power supply cable in any suitable manner. In a set of embodiments, the cable securing means is configured to hold the power supply cable against the lower part.

[0017] The cable securing means is configured to secure the power supply cable to the lower part of the power base. In a set of embodiments, the cable securing means is configured to secure the power supply cable to the lower part in a manner in which at least at the portion of the power supply cable which is secured to the lower part cannot be moved relative to the lower part. This arrangement may help to ensure that any forces that are applied through the power supply cable, e.g. due to bending of the power supply cable, are substantially, e.g. only, applied to the lower part, rather than any other part of the power base.

[0018] The lower part, to which the power supply cable is secured, is arranged below the upper part. The lower part may be arranged to rest, in use, on a work surface. The lower part may be arranged to rest directly on a work surface. The work surface may, for example, comprise a countertop. In other embodiments, the lower part may be an intermediate part arranged between the upper part and a further lower part which is arranged below the lower part. In any case, by securing the power supply cable to the lower part, which is separate to the upper part, forces applied by the power supply cable may be prevented from being transferred to the upper part.

[0019] The lower part may comprise a single moulded body. However, in some embodiments, the lower part comprises a first sub-part, arranged to rest on a work surface, and a second sub-part attached to the first sub-part. The first sub-part may be shaped to receive the upper part and allow the upper part to move relative to the second sub-part. The second sub-part may function to enclose a bottom of the lower part, and may thus be considered to be a lower cover. The provision of a first and second sub-parts may facilitate assembly of the power base.

[0020] The cordless electrical connector may be integrally formed with the upper part. However, in a set of embodiments, the cordless electrical connector is mounted to the upper part. The cordless electrical connector may be arranged such that there is a minimum clearance, e.g. 8mm, beneath the cordless electrical connector and a surface, e.g. of the lower part, facing an underside of the cordless electrical connector. This minimum clearance may prevent an electrical short circuit occurring within the cordless electrical connector in the situation in which water enters a space between the upper and lower parts. This may therefore improve the safety of the power base. The minimum clearance required may depend on the type of connector used within the power base as well as the power base design. In other embodiments, the minimum clearance may, for example be 6 mm or 10 mm.

[0021] The weight sensor may have any suitable form. In a set of embodiments, the weight sensor comprises a plurality of sub-sensors spatially distributed between the upper part and lower part. The plurality of sub-sensors may be spatially distributed around an axis extending through the upper part and lower part. In embodiments comprising a cordless electrical connector, the axis may extend through a centre of the cordless electrical connector. The plurality of sub-sensors may, for example, comprise at least three, e.g. at least four, sub-sensors.

[0022] The plurality of sub-sensors may be spatially distributed in any suitable manner. In a set of embodiments, the plurality of sub-sensors are evenly spatially distributed between the upper part and the lower part. For example, the plurality of sub-sensors may be equiangularly distributed around an axis extending through the lower part and upper part. The axis may be a central axis, for example an axis extending through the cordless electrical connector, where included. Evenly distributing the sub-sensors in this manner may mean that, in embodiments wherein the power base is configured to receive the appliance part irrespective of angular orientation, it is still possible to accurately measure the weight of the removable appliance part. Such an arrangement may also advantageously account for embodiments in which a centre of mass of the appliance part is not aligned with the axis extending through a centre of the cordless electrical adaptor of the removable appliance part.

[0023] In an alternative set of embodiments, the weight sensor comprises a single weight sensor arranged between the upper part and the lower part. The single weight sensor may, for example, be arranged centrally between the upper part and the lower part. For example, the single weight sensor may be arranged beneath, and in line with, the cordless electrical connector (where included). The provision of a single weight sensor may reduce the overall cost of the power base. The use of a single weight sensor may reduce the accuracy of measurement of the weight of the appliance part, however this arrangement may nonetheless still be useful in embodiments wherein an approximate number of cups of water are required, rather than an exact volume. The weight sensor may take any suitable form that is capable of measuring the weight of the removable appliance part. In a set of embodiments, the weight sensor comprises at least one strain gauge. In embodiments in which the weight sensor comprises a plurality of sub-sensors, each of the sub-sensors may comprise a strain gauge. An output of the strain gauge may indicate the weight of the appliance part when seated on the power base during use. In other embodiments, any other suitable means for measuring the weight may be employed. For example, a force-sensitive resistor may be utilized. The Applicant has also recognized that the weight sensor need not be electrical / electronic. As such, in some embodiments, the weight sensor may be non-electrical and may, for example comprise a mechanical scale. Such a mechanical scale may comprise a resilient element, e.g. a spring, in combination with a weight indicator, e.g. a dial.

[0024] The weight sensor may be arranged in any suitable position between the upper part and lower part. In a set of embodiments, the weight sensor is arranged between the upper part and lower part in a manner such that all downward vertical force applied to the upper part is applied through the weight sensor. The upper part and lower part may have any suitable form / arrangement with respect to one another such that the vertical force is applied in this manner. In being arranged to apply all downward vertical force through the weight sensor, the upper part may be considered to be floating / resting on the weight sensor. In other words, the upper part may be seated on the weight sensor such that all downward vertical force is applied through the weight sensor. The upper part may be seated directly on the weight sensor. However, in some embodiments, at least one intermediate member may be arranged between the upper part and the weight sensor. In other embodiments, only part of the weight of the removable appliance part is transferred into the weight sensor. The power base may be configured to take this into account, e.g. using suitable control circuitry, when providing an indication as to the weight of the removable appliance part.

[0025] In some embodiments, the upper part and lower part may be resiliently biased towards one another, or resiliently biased away from one another. In some embodiments, at least one resiliently biased (e.g. spring) member may be arranged between the upper part and the lower part. The at least one resiliently biased member may be arranged to push the upper part in a direction away from the lower part, or pull the upper part in a direction towards the lower part. As such, the at least one resiliently biased member may prevent the upper part from being able to move freely with respect to the lower part (at least when there is no removable appliance part seated on the power base), which may help to prevent rattling within the power base. As the force from the at least one resiliently biased member acts between the upper part and lower part, this may not be impacted by forces applied through the power supply cable and so may not impact the accuracy of the measurement performed by the weight sensor. In embodiments wherein the at least one resiliently biased member is arranged to push the upper part in a direction away from the lower part, a spring force provided by the at least one resiliently member may be set to be lower than the weight of the upper part plus the minimum weight of the appliance. As such, when the appliance part is seated on the upper part, it will overcome the spring force provided by the at least one resiliently biased member and apply a force to the weight sensor. The at least one resiliently biased member may be integrally formed with at least one of the upper part and lower part. In other embodiments, the at least one resiliently biased member may be a separate part to the upper part and lower part. In some embodiments, the at least one resiliently biased member comprises a plurality of resiliently biased members. The at least one resiliently biased member may, for example, be in the form of a leaf spring, or a coil spring. The weight sensor, or control circuitry connected thereto, may be configured to take into account the spring force applied by the at least one resilient member, when measuring the weight of the removable appliance part.

[0026] In a set of embodiments, the upper part and lower part together comprise a retention arrangement configured such that in at least one angular position of the upper part relative to the lower part, the upper part is able to move vertically with respect to the lower part and is also prevented from being separated from the lower part when moving in the vertical direction only. For example, the retention arrangement may comprise a bayonet fitting comprising at least one protruding pin and at least one corresponding slot, e.g. an L-shaped slot, arranged to receive the protruding pin. The L-shaped slot and pin may be dimensioned so as to facilitate a small range of vertical movement between the upper part and lower part during use of the power base. This may allow the upper part to move vertically thereby applying a force to the weight sensor during use. The amount of vertical movement may, for example, be 1.5-2.5 mm, e.g. 2 mm. The vertical movement of the upper part may help to avoid interference between the parts of the power base.

[0027] In a set of embodiments, the upper part and lower part together define a housing of the power base. The upper part may, for example, define a top-portion of the housing and the lower part may define a side, e.g. peripheral, and bottom portion of the housing. In any of the embodiments herein, the upper part and lower part may be moulded, e.g. injection moulded, plastic bodies. In some embodiments, in which the upper and lower part together define a housing, the power supply cable extends from the housing. For example, the power supply cable may extend out through a side wall of the housing. The side wall may, for example, be defined by the lower part of the power base. Of course, in other embodiments, the power supply cable may enter the power base, e.g. the housing thereof, on an underside thereof. The lower part may be configured to rest directly on a work surface. In a set of embodiments, the lower part comprises a plurality of feet arranged to rest on a work surface. The plurality of feet may be integrally formed with, or attached to, the lower part. The plurality of feet may comprise a contact portion which has a high coefficient of friction, so as to prevent the lower part from sliding on the work surface. For example, the plurality of feet may comprise a rubber portion arranged to contact the work surface.

[0028] Through the presence of the weight sensor in the power base, it may be possible to indicate to a user the volume of a liquid within the removable appliance part. In a set of embodiments, the power base further comprises an indicator means configured to provide an indication relating to the weight measured by the weight sensor. The indicator means may, for example, comprise an electronic display, e.g. a liquid crystal display (LCD), or a light emitting diode (LED) display. The electronic display may, for example, provide an indication as to the volume of liquid within the appliance part. The volume may be indicated as a number of cups of a predefined volume, or an actual measure of volume, e.g. in millilitres, litres, fluid ounces etc. The volume may be determined based on the weight measured by the weight sensor.

[0029] The power base may comprise control circuitry, e.g. in the form of an electronic controller. The electronic controller may be connected to the weight sensor and the indicator means (where included). The electronic controller may be configured to determine the weight of the contents (e.g. a liquid) of the removable appliance part, and may convert this weight into a volume. This conversion may be based on an expected density of the material contained within the removable appliance part.

[0030] Determination of the weight of the contents of the removable appliance part may be achieved through suitable calibration of the electronic controller, which may involve measuring the weight of the removable appliance part when it is empty of its contents, e.g. empty of water. This calibration may be performed in a factory, using a single removable appliance part, and the empty weight of the removable appliance part may then be used in electronic control circuitry for a plurality of power bases. In addition, or alternatively, the calibration may be performed by a user of the power base.

[0031] In order to determine the weight of the contents of the removable appliance part, the power base, e.g. electronic control circuitry therein, may be configured to subtract the weight of the removable appliance part when empty from the measured weight of the removable appliance part when it is received on the power base. The difference is the weight of the contents (e.g. liquid) within the removable appliance part.

[0032] The provision of the weight sensor may also allow for more sophisticated indications to be provided. This may be particularly relevant when the removable appliance part is in the form of a liquid heating vessel. In a set of embodiments, the power base is for receiving a removable appliance part in the form of a liquid heating vessel, and wherein the power base further comprises a control circuit configured to: determine, using the weight sensor, a first amount of liquid within the removable appliance part when the removable appliance part is positioned on the power base; detect when the removable appliance part has been removed from the power base and subsequently placed back on the power base; and after said detection, determine, using the weight sensor, a second amount of liquid within the removable appliance part.

[0033] Determination of the amount of liquid within the removable appliance part at different points in time when the removable appliance part is seated on the power base may allow for analysis of how a user is operating an appliance comprising the power base.

[0034] In a further set of embodiments, the control circuit is further configured to determine whether the difference between the first amount of liquid and the second amount of liquid is less than a threshold. When the difference is less than a threshold, this may indicate that a user has only dispensed a small volume of liquid from the removable appliance part. The dispensing of a small amount of liquid may be considered to be uneconomical use of the appliance. In a further set of embodiments, the control circuit is configured, in response to determining that the difference is less than the threshold, to send a signal for triggering a user-alerting means arranged to alert a user that an over-fill has occurred.

[0035] The power base may thus be capable of providing feedback to a user on how efficiently they are using the appliance, which the power base forms part of. The indicator means, where provided, may be the user-alerting means. In some embodiments, the user-alerting means is separate to the indicator means.

[0036] In another set of embodiments, the power base is for receiving a removable appliance part in the form of a liquid heating vessel, and wherein the power base further comprises a control circuit configured to: determine that the removable appliance part has been operated whilst being seated on the power base; detect when the removable appliance part has been removed from the power base and subsequently placed back on the power base; after said detection, determine, using the weight sensor, a remaining amount of liquid within the removable appliance part; compare the remaining amount of liquid to a first threshold; and wherein if the remaining amount of liquid is greater than the first threshold, to send a signal for triggering a user-alerting means arranged to alert a user that an over-fill has occurred.

[0037] The determination that the removable appliance part has been operated may be a determination that the removable appliance part has been operated to heat the contents of the liquid therein. Detection of this may be determined by detecting the transfer of electrical power through a cordless electrical connector, which may be indicative of the removable appliance part having been operated. Of course, any other means for detecting operation of the removable appliance part may be used. The first threshold may, for example, correspond to 200 ml. The exact threshold amount may, of course, depend on the volume of the removable appliance part and so may be more or less than 200 ml. In other embodiments, the threshold may be based on a percentage change in the liquid within the removable appliance part. In the most economical situation, following operation and removal of the removable appliance part from the power base, the entire contents thereof will be used and thus the amount of liquid in the removable appliance part when it is subsequently put back on the power base may be zero. However, in reality, as it is often difficult to fill the removable appliance part with the exact amount of liquid required, it is expected that even when a user fills the removable appliance part in an economical manner, there may still be a small amount of liquid within the removable appliance part. As such, the first threshold being non-zero, but still relatively small, may prevent the repeated indication of an over-fill, when only a small amount of liquid remains in the removable appliance part. The above embodiment may nonetheless provide an indication to a user when they have overfilled the removable appliance part during use with more water than they actually needed.

[0038] Whilst the above has been described in the context of a liquid, the power base may be used with removable appliance parts which contain a material other than a liquid, e.g. a food product. As such, the embodiments described above may equally be used to determine a weight of a food material within the removable appliance part, rather than a liquid. In a set of embodiments, a control circuit is configured to use the weight sensor to determine when the removable appliance part has been removed from, and placed back on, the power base. Use of the weight sensor as a means for detecting when the removable appliance part has been removed from the power base may reduce the number of components required to perform the steps set out above.

[0039] In some embodiments, the power base comprises a control circuit configured to control operation of the power base. The control circuit may perform the functions set out above. In a further set of embodiments, the control circuit is configured to: determine the weight of the contents of the removable appliance part using the weight sensor; compare the weight to a maximum fill threshold; and if the weight is greater than the maximum fill threshold, to send a signal for triggering a user-alerting means arranged to alert a user than an over-fill has occurred.

[0040] In this context, the power base may be capable of providing an indication that too much material, e.g. water, has been inserted into the removable appliance part. This may prevent the user from operating the removable appliance part in a manner which may cause damage to the removable appliance part and / or cause a safety hazard.

[0041] In another set of embodiments, the control circuit is configured to: determine the weight of the contents of the removable appliance part using the weight sensor; compare the weight to a minimum fill threshold; and if the weight is less than the minimum fill threshold, to send a signal for triggering a useralerting means arranged to alert a user than an under-fill has occurred.

[0042] In this context, the power base may be capable of providing an indication that too little material, e.g. water, has been inserted into the removable appliance part. This may prevent the user from operating the removable appliance part in a manner which may cause damage to the removable appliance part and / or cause a safety hazard.

[0043] The power base may have any suitable form. In some embodiments, the power base may be suitable for receiving an appliance part in a single orientation. However, in a set of embodiments, the power base is configured to receive a removable appliance part substantially irrespective, e.g. irrespective, of the angular orientation of the removable appliance part relative to the power base. In such embodiments, the appliance part may have a generally circular cross-section. As such, the upper part of the power base may have a substantially circular, e.g. circular, cross section. Such an upper part may define an upper circular receiving portion on which the appliance part may be seated. The lower part may have any shape capable of receiving the upper part. In further embodiments, wherein the power base comprises a cordless electrical connector, the cordless connector may comprise a 360-degree cordless connector arranged to mate with a corresponding adaptor at any angular orientation.

[0044] The cordless power cable may be directly connected to the cordless electrical connector (where included). For example, the power supply cable may comprise a live, neutral and an earth (where provided) core which may be connected to respective live, neutral and earth terminals on the cordless electrical connector. In other embodiments, the cordless power cable may be connected indirectly to the cordless electrical connector, via at least one electrical component within the power base. The weight sensor may be connected to the electrical component. The electrical component may comprise a control circuit, e.g. an electronic controller.

[0045] The present invention is not limited to the provision of just a power base. Accordingly, when viewed from a second aspect, the present invention provides an electrical appliance comprising: a power base of any preceding claim; and a removable appliance part configured to be seated on the power base.

[0046] The removable appliance part may comprise any suitable appliance part in which it is desirable to measure the weight of the contents thereof. For example, the removable appliance part may comprise a food mixer or blender in which it is desirable to know the amount of food / liquid within the mixer or blender. The electrical appliance may be a domestic electrical appliance. The electrical appliance may be a countertop electrical appliance. In a set of embodiments, the removable appliance part is a liquid heating vessel. In such embodiments, the electrical appliance may be a cordless electrical kettle suitable for heating water. In other embodiments, the liquid heating vessel may be a milk frother, which is configured to heat and froth milk. The removable appliance part may be seated on the power base and removed therefrom (e.g. for filling of the removable appliance part with water) by a user of the appliance. The power base and removable appliance part are thus physically separate components.

[0047] As set out above with respect to the power base, an indicating means may be arranged on the power base so as to provide an indication relating to the weight measured by the weight sensor. In some embodiments, the removable appliance part comprises an indicating means configured to provide an indication relating to the weight measured by the weight sensor. In such embodiments, there may be a data connection between the power base and the removable appliance part which facilitates the transfer of data therebetween. The data connection may facilitate the transfer of data including the weight measured by the weight sensor from the power base to the removable appliance part, for indication on the indicating means.

[0048] As discussed previously, the power base may comprise a weight sensor which comprises a plurality of sub-sensors which are suitably spaced so as to accurately indicate the weight of the removable appliance part when its centre of mass is not necessarily aligned with its centerline. In other embodiments, the removable appliance part is configured such that its centre of gravity is substantially aligned with a centerline extending through the removable appliance part and wherein the weight sensor in the power base comprises a single weight sensor.

[0049] In such embodiments, as the centre of gravity is substantially aligned with a centerline extending through the appliance, the angular position of the removable appliance part relative to the power base may have less of an impact on the weight measurement, and thus it may be possible to only utilize a single weight sensor, as opposed to a weight sensor comprising a plurality of sub-sensors. The removable appliance part may be configured in any suitable manner such that its centre of gravity is substantially aligned with its centerline. For example, components within the removable appliance part may be suitably arranged so as to shift the centre of gravity accordingly. For example, in embodiments wherein the removable appliance part is in the form of a liquid heating appliance, the removable appliance part may include a heating element, e.g. a resistive heating element, and a heat diffuser plate. The heating element may be shaped such that there is a void at one end thereof. The heating element may be arranged in the removable appliance part such that the void is on a side of the removable appliance part which is otherwise heavier than an opposing side of the removable appliance part. For example, the void may be arranged on a side of the removable appliance part which comprises a handle, which otherwise moves the centre of gravity away from the centre of the removable appliance part. The void may be arranged between cold tails of the heating element, i.e. the terminals of the heating element.

[0050] Similarly, the heat diffuser plate may comprise a cut-away, and again this may be arranged such that the cut-away is on a side of removable appliance part which is otherwise heavier than the opposite side. This is just one example of how the removable appliance part may be configured such that its centre of gravity is substantially aligned with the centerline. In some embodiments, the centre of mass is fully aligned with the centerline. The centerline of the removable appliance part may extend through a centre of a cordless electrical adaptor arranged on the base of the removable appliance part.

[0051] In embodiments of the second aspect of the invention, the removable appliance may comprise a cordless electrical adaptor configured to mate with the cordless electrical connector on the power base (where provided). In other embodiments, the removable appliance part may be configured to be seated on the power base, but an electrical connection may not be formed therebetween. Instead, the power base may comprise an inductive heater, and the removable appliance part may comprise a susceptor arranged to heat the contents thereof.

[0052] According to a third aspect of the present invention there is provided a power base for receiving a removable appliance part thereon, the power base comprising: an upper part configured to receive, in use, the removable appliance part thereon; a lower part, separate to the upper part, arranged below the upper part and arranged to rest, in use, on a work surface; a weight sensor arranged between the upper part and the lower part; a power supply cable configured to supply the power base with electrical power; and a cable securing means configured to secure the power supply cable to the lower part.

[0053] Features of any of the embodiments of the first and second aspects of the invention may equally be applied to this third aspect of the invention.

[0054] According to a fourth aspect of the present invention there is provided a power base for receiving in a first configuration a removable appliance part and in a second configuration a scale part configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; an output means configured to output an indication relating to the weight measured by the weight sensor; and a detection means configured to detect when the scale part is received on the power base; wherein the output means is configured to output the indication relating to the weight measured by the weight sensor when the detection means detects that the scale part is received on the power base. According to a fifth aspect of the present invention there is provided a system comprising a power base and a scale part configured to convert the power base into a weighing scale, wherein the power base is configured to receive in a first configuration a removable appliance part and in a second configuration the scale part, wherein the power base comprises: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; an output means configured to output an indication relating to the weight measured by the weight sensor; and a detection means configured to detect when the scale part is received on the power base; wherein the output means is configured to output the indication relating to the weight measured by the weight sensor when the detection means detects that the scale part is received on the power base.

[0055] It will be appreciated that the fourth and fifth aspects of the present invention provide a multifunctional power base that is configured to transfer energy to a removable appliance part as well as to operate as a weighing scale. Providing such a multifunctional power base may provide space-saving benefits for the user, and improve convenience of use. It will be appreciated that the power base is configured to receive separately, one at a time, the removable appliance part in the first configuration, and the scale part in the second configuration.

[0056] The power base comprises a detection means configured to detect when the scale part is received on the power base and the output means is configured to output the indication relating to the weight measured by the weight sensor when the detection means detects that the scale part is received on the power base. The Applicant has appreciated that, by positively detecting when the scale part is received on the power base and configuring the output means to output the weight indication when this detection is made, the weighing scale function of the power base may be restricted to when the scale part is present. In other words, the user may, in some embodiments, be required to place the scale part on the power base in order to enable the weighing scale function. As will be discussed in more detail below, this may help to improve the safety of the power base.

[0057] In some embodiments, the system further comprises the removable appliance part. The removable appliance part may comprise an energy consuming means which consumes energy transferred from the energy transmission means of the power base. The energy consuming means may comprise a heating element. The energy consuming means may comprise a motor. In some embodiments, the heating element is an electrical heating element, e.g. a sheathed electrical heating element. In some embodiments, the heating element comprises a ferromagnetic susceptor arranged to be heated by induction. The removable appliance part may comprise a vessel configured to receive a material, e.g. liquid or foodstuff. Where a heating element is included, the heating element may be arranged to heat the contents of the vessel. The removable appliance part may comprise a kettle.

[0058] The energy transmission means may comprise an electrical connector configured to mate with a corresponding electrical adaptor on the removable appliance part. The electrical connector may be a cordless electrical connector configured to mate with a corresponding cordless electrical adaptor on the removable appliance part. The electrical connector may be a 360° cordless connector, and hence the cordless electrical adaptor may similarly be a 360° cordless adaptor. The electrical connector may extend upwardly from an upper surface of the power base.

[0059] The scale part may be shaped to cover the electrical connector when the scale part is received on the power base. This may help to improve the safety of the power base when it is used as a weighing scale, as the risk of liquid or food damaging the electrical connector may be reduced. Similarly, the risk of short circuits arising as a result of liquid or food entering the electrical connector may also be reduced.

[0060] In some embodiments, the energy transmission means comprises an induction element for inducing heating in a susceptor of the removable appliance part.

[0061] In some embodiments, the scale part comprises a magnet mounted thereto. The provision of a magnet may allow for more positive identification of the scale part being placed on the power base, as other items, e.g. a typical kitchen plate, or bowl etc, do not, at least typically, include such a magnet. The magnet may be embedded within the scale part. The magnet may be mounted on, or proximal to, an underside of the scale part. The magnet may be mounted on or adjacent a surface of the scale part that, when the scale part is received on the power base, is proximal to the power base. This may improve the reliability with which the detection means can detect when the scale part is received on the power base, as the presence of the magnet may be more reliably detected.

[0062] In some embodiments, the detection means comprises a magnetic field sensor arranged to detect the presence of the magnet when the scale part is received on the power base. In some embodiments, the magnetic field sensor comprises a reed switch. In some embodiments, the magnetic field sensor comprises a Hall effect sensor. The magnetic field sensor may be mounted on the power base such that, when the scale part is received on the power base, the magnetic field sensor is proximal to the scale part. This may help to improve the reliability of detection. The magnetic field sensor may be mounted on or proximal to an upper surface of the power base. In some embodiments, the magnetic field sensor is mounted below (e.g. on or adjacent an underside of) an upper casing of the power base.

[0063] In some embodiments, the detection means is further configured to detect when the removable appliance part is received on the power base. This may be achieved in any suitable manner. The detection means may, in some embodiments, comprise circuitry for detecting a closed circuit when the electrical connector of the power base mates with the corresponding electrical adaptor of the removable appliance part. In some embodiments, similarly to the scale part discussed above, the removable appliance part may comprise a magnet mounted thereto and the detection means may comprise a magnetic field sensor arranged to detect the presence of the magnet of the removable appliance part when the removable appliance part is received on the power base. The magnet of the removable appliance part may be different to the magnet of the power base such that the detection means can distinguish between whether the removable appliance part or the scale part is received on the power base.

[0064] In some embodiments, the output means is configured, in response to the detection means detecting that the scale part is not received on the power base, not to output the indication of the weight measured by the weight sensor. This may serve to dissuade a user from trying to weigh objects on the power base when the scale part is not received thereon, as even if they place an object to be weighed on the power base, no weight is output.

[0065] In some embodiments, the output means is configured, in response to the detection means detecting that: the scale part is not received on the power base; and the removable appliance part is not received on the power base, not to output the indication of the weight measured by the weight sensor. Similarly to the embodiment described above, such embodiments may dissuade a user from trying to weigh objects on the power base when the scale part is not received thereon, as even if they place an object to be weighed on the power base, no weight is output

[0066] In some embodiments, the detection means comprises circuitry configured to use the weight measured by the weight sensor to determine when the scale part is received on the power base. The circuitry may be configured, alternatively or additionally, to use the weight measured by the weight sensor to determine when the removable appliance part is received on the power base. The circuitry may be configured to compare a weight measurement obtained by the weight sensor with a reference weight. The reference weight may be a scale part reference weight representative of the weight of the scale part. The reference weight may be a removable appliance part weight representative of the minimum weight of the removable appliance part (e.g. the weight of the removable appliance part when it does not contain liquid, foodstuff, etc.). The use of the weight as a means for identifying whether the scale part and / or the removable appliance part is received on the power base may remove the need for additional sensors in order to achieve this detection. It may, therefore, simplify and potentially reduce the cost of the power base.

[0067] In some embodiments, the output means is configured, when the detection means detects that the scale part is received on the power base, to discount the weight of the scale part when outputting the indication relating to the weight measured by the weight sensor. In other words, the reading of the weight sensor will include the weight of the scale part itself as well as any object received thereon. As the weight of the scale part is not likely to be of any interest to a user, by discounting (i.e. subtracting) the weight of the scale part from the weight measured by the weighing sensor, only the weight of the object being weighed is output. It will be appreciated that this may be considered to provide a zeroing operation which removes the weight of the scale part.

[0068] The power base may comprise circuitry for subtracting the weight of the scale part from the weight measured by the weight sensor. The circuitry may comprise a memory. The memory may be configured to store a scale part reference weight. The scale part reference weight may be the weight of the scale part alone. The circuitry may be configured to subtract the scale part reference weight from the weight measured by the weight sensor. The circuitry may be configured to detect a weight measured by the weight sensor when the scale part is received on the power base and to store said measurement in the memory as the scale part reference weight.

[0069] In some embodiments, the output means is configured, when the detection means detects that the removable appliance part is received on the power base, to output the indication relating to the weight measured by the weight sensor.

[0070] The output means may be configured, when the detection means detects that the removable appliance part is received on the power base, to discount (i.e. subtract) a removable appliance part reference weight when outputting the indication relating to the weight measured by the weight sensor. As with the embodiments discussed above, this may ensure that the output is only related to the contents of the removable appliance part, rather than including the weight of the removable appliance part itself.

[0071] The memory may be configured to store a removable appliance part reference weight. The removable appliance part reference weight may be the weight of the removable appliance part absent any liquid or foodstuff therein. The circuitry may be configured to subtract the removable appliance part reference weight from the weight measured by the weight sensor.

[0072] The indication relating to the weight may comprise an indication of the weight measured by the weight sensor, e.g. an amount in grams, kilograms etc. In some embodiments, the indication relating to the weight may comprise a liquid volume, e.g. of the contents of the removable appliance part, this may be displayed, for example, in milliliters, liters etc. The power base may comprise circuitry configured to calculate a liquid volume of the contents of the removable appliance part using the weight measured by the weight sensor. Preferably the circuitry is configured to calculate the liquid volume of the contents of the removable appliance part in response to the detection means detecting that the removable appliance part is received on the power base. The form of the indication relating to the weight may be selectable by a user. For example, a user may select an output in grams, kilograms, milliliters, liters, cups etc. This may be selected, for example, via a user interface on the power base. In some embodiments, the power base may be configured to automatically provide an indication in the form of weight when the scale part is received on the power base and / or automatically provide an indication in the form of liquid volume when the removable appliance part is received on the power base.

[0073] In some embodiments, the energy transmission means comprises an electrical connector configured to mate with a corresponding electrical adaptor on the removable appliance part. The electrical connector may comprise at least three electrical contacts. In some embodiments, when a connection is made between at least two, but not all, of the plurality of electrical contacts, the detection means is configured to detect that the scale part is received on the power base. The scale part may comprise an electrically conductive element configured to establish a connection between two of the plurality of electrical contacts when the scale part is received on the power base. The detection means may be configured to detect that the removable appliance part is received on the power base when a connection is made between some or all of the plurality of electrical contacts. In the exemplary case of a 5-pole electrical connector, when all 5-poles of the electrical connector are electrically connected to corresponding poles of an adaptor in the removable appliance part, it may be determined that the removable appliance part is received on the power base. In contrast, when only two of the five poles are electrically connected, it may be determined that the scale part is received on the power base. The power base may comprise suitable electrical circuitry to test the electrical connection of the electrical contacts of the electrical connector.

[0074] In some embodiments, the output means comprises a display. The output means may comprise a controller for controlling the display. The display may comprise an electronic display, e.g. a light emitting diode display. The display may comprise an electronic display screen, e.g. a liquid crystal display (LCD).

[0075] In some embodiments, the scale part comprises a flat upper surface. This may allow objects to be positioned on the scale part more easily, which may improve the reliability of the weight measurement. In some embodiments, the scale part comprises a bowl. This may improve the ease with which objects and / or liquids may be weighed.

[0076] In some embodiments, the scale part is arranged to extend over the entire upper surface of the power base when the scale part is received on the power base. The scale part may comprise a skirt configured to extend over the power base when the scale part is received on the power base. The skirt may be configured to extend past the upper surface of the power base. This may help to protect the power base from damage during use of the scale part.

[0077] In some embodiments, the system further comprises the removable appliance part. In such embodiments, the scale part may be removably attachable to the removable appliance part. This may provide for a convenient means for storing the scale part. The removable appliance part may comprise a vessel, e.g. for receiving liquid and / or foodstuff. In some embodiments, the scale part is removably attachable to the removable appliance part as a lid for the vessel. In some embodiments, the removable appliance part comprises a lid for closing the vessel, and the scale part is configured to be removably received on or within the lid of the removable appliance part. This may allow the scale part to be more easily stored together with the removable appliance part. The scale part may be removably attachable to the removable appliance part by a friction fitting.

[0078] In some embodiments, the scale part is removably attachable to the power base in a storage configuration. The scale part may be removably attachable to the power base by a bayonet fitting. In some embodiments, the scale part is movably attached to the power base, e.g. between a first position in which the scale part is received on the power base and a second position in which the scale part is attached to, but not received on, the power base, i.e. in a storage configuration. The scale part may be hingedly connected to the power base. This may allow the scale part to be more easily stored together with the power base.

[0079] Storage of the scale part together with the power base is considered to be novel and inventive in its own right. Thus, according to a sixth aspect, there is provided a system comprising a scale part and a power base for receiving in a first configuration a removable appliance part and in a second configuration the scale part thereon, wherein the scale part is configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; and an output means configured to output an indication relating to the weight measured by the weight sensor; wherein: the power base is configured to receive the scale part in a storage configuration in which the removable appliance part can be received directly on the power base so as to receive energy from the energy transmission means.

[0080] The power base may comprise a recess or a cavity configured to receive the scale part in the storage configuration. The scale part may be hingedly attached to the power base such that, in the storage configuration, the scale part is hinged away from the energy transmission means and, in a deployed configuration, the scale part is received on the power base (e.g. so as to cover the energy transmission means). The system may further comprise a removable appliance part.

[0081] According to a seventh aspect, there is provided a system comprising a scale part, a removable appliance part, and a power base for receiving in a first configuration the removable appliance part and in a second configuration the scale part thereon, wherein the scale part is configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; and an output means configured to output an indication relating to the weight measured by the weight sensor; wherein: the removable appliance part is configured to receive the scale part in a storage configuration in which the removable appliance part can be received directly on the power base so as to receive energy from the energy transmission means.

[0082] Thus, in accordance with the seventh aspect, the scale part may be configured to be stored together with the removable appliance part. The removable appliance part may comprise a recess or cavity configured to receive the scale part in the storage configuration. The recess or cavity may be arranged on or within a lid of the removable appliance part.

[0083] The scale part may be separate to a lid of the removable appliance part. In some embodiments, the removable appliance part may be configured to receive the scale part in the storage configuration as a lid of the removable appliance part (e.g so as to cover a vessel of the removable appliance part).

[0084] Where circuitry is described in any of the embodiments discussed above, it will be appreciated that the circuitry may be embodied in the form of a controller. The controller may, for example, comprise a processor.

[0085] In any of the embodiments discussed above, the removable appliance part may comprise a plurality of components which together form the removable appliance part (e.g. a vessel, a heating element, a lid etc). Similarly, in any of the embodiments described above, the scale part may comprise a plurality of components which together form the scale part (e.g. a bowl together with magnet). In some embodiments, the scale part may be a monolithic component.

[0086] Features of any of the embodiments of the fourth and fifth aspects of the invention may be applied to any of the embodiments of the sixth and seventh aspects of the invention. Similarly, features of any of the first, second, and third aspects of the invention may be applied to any of the embodiments of the fourth to seventh aspects of the invention.

[0087] In any of the embodiments described above, where a liquid is described, the liquid may comprise water, milk, or any other liquid which may be heated or processed in any other suitable manner by the removable appliance part.

[0088] Some preferred embodiments of the present invention will now be described, by way of example, only, and with reference to the accompanying drawings, in which: Fig. 1 shows a perspective view of a cordless electrical appliance in accordance with an embodiment of the present invention, including a power base in accordance with an embodiment of the present invention;

[0089] Fig. 2 shows a perspective view of the power base shown in Fig. 1 in isolation;

[0090] Fig. 3 shows an exploded view of the power base shown in earlier Figs.;

[0091] Fig. 4 shows an underside view of the power base shown in earlier Figs.;

[0092] Fig. 5 shows a cross-sectional view of the cordless electrical appliance shown in Fig. 1 ;

[0093] Fig. 6 shows a cross-sectional view of a cordless electrical appliance in accordance with another embodiment of the present invention, including a power base in accordance with another embodiment of the present invention;

[0094] Fig. 7 shows a view of an underside of a heat diffuser plate and heating element included in the removable appliance part of the appliance shown in Fig. 6;

[0095] Fig. 8 shows a view of the underside of the power base shown in Fig. 6;

[0096] Fig. 9 shows a perspective view of the power base shown in Fig. 6 with the upper part separated therefrom;

[0097] Fig. 10 shows a perspective view of a lower part of a power base including an integrated cable securing means;

[0098] Fig. 11 shows the steps that may be performed by control circuitry in the power base;

[0099] Fig. 12 shows an embodiment of a power base including a user-alerting means;

[0100] Fig. 13 shows a perspective view of a cordless electrical appliance, in accordance with another embodiment of the present invention, in which the removable appliance part comprises an indicator means;

[0101] Fig. 14 shows a sectional view of a cordless electrical appliance, in accordance with an embodiment of the present invention, comprising an inductive heater and a susceptor;

[0102] Fig. 15 shows an exploded view of another embodiment of a power base which comprises a resiliently biased member acting between the upper part and lower part thereof;

[0103] Fig. 16 shows a perspective view of a system comprising a cordless electrical appliance, a power base and a scale part for converting the power base into a weighing scale;

[0104] Fig. 17 shows a cross-sectional view of the power base and scale part of Fig. 16; and

[0105] Fig. 18 shows a perspective view of the system of Fig. 16 in which the scale part is shown in a storage configuration;

[0106] Fig. 19 shows a cross-sectional view of a cordless electrical connector of a power base, together with a cordless electrical adaptor of a removable appliance part, and an adaptor of a scale part, in accordance with an embodiment of the present invention;

[0107] Fig. 20 shows a schematic view of a system in accordance with another embodiment of the present invention in which the scale part is stored together with the power base, or as a lid for the removable appliance part; and Fig. 21 shows a schematic view of a system in accordance with another embodiment of the present invention, wherein the cover part is mounted to the power base via a hinge.

[0108] Figure 1 shows a perspective view of a cordless electrical appliance 2 in accordance with an embodiment of the present invention. In the embodiment depicted, the cordless electrical appliance 2 comprises a power base 4 in accordance with an embodiment of the present invention, as well as a removable appliance part 6. In the embodiment depicted the removable appliance part 6 is in the form of a liquid heating vessel, although any other suitable removable appliance part may be utilised.

[0109] Figure 2 shows the power base 4, shown in Figure 1 , in isolation. As shown in this Figure, the power base 4 comprises an upper part 8 and a lower part 10 which together define a main housing of the power base 4. A power supply cable 12 extends into the main housing defined by the upper and lower parts 8, 10. A cordless electrical connector 14 extends upwards from the upper part 8 so as to mate with a corresponding adaptor (not yet shown) in the removable appliance part 8 shown in Figure 1. The cordless electrical connector 14 may be mounted to the upper part 8. In other embodiments, the cordless electrical connector 16 may be integrally formed with the upper part 8. In some embodiments, as shown, the power base 4 comprises an indicator means 16, e.g. in the form of an LCD or LED display. The indicator means 16 may be used to provide an indication regarding a weight measured by a weight sensor providing within the power base 4. The weight may be indicated as a volume of liquid contained within the removable appliance part 6. The indicator means 16 may also be used to indicate an operational mode or state of the removable appliance part 6, when seated on the power base 4.

[0110] Figure 3 shows an exploded view of the power base 4 discussed above and shown in earlier Figures. The upper part 8, of the power base 4, has a circular cross-section so as to suitably receive the removable appliance part 6, the bottom of which, at least, also has a corresponding circular cross section. The upper part 8 comprises an aperture 18 in its centre for receiving the cordless electrical connector 14. The upper part 8 comprises a circumferentially extending skirt 20 extending around its periphery. The skirt 20 comprises at least one L-shaped slot 22 therein. The L-shaped slot 22 is dimensioned to receive a pin (not visible in this Figure) protruding radially inwards on the lower part 10. Engagement between the pin and the L-shaped slot 22 prevents the upper part 8 from separating from the lower part 10 during typical use of the power base 4. The L-shaped slot 22 also permits vertical movement of the upper part 8 relative to the lower part 10. The L-shaped slot 22 and pin (not shown) form a retention arrangement. The cordless electrical connector 14 is secured to the upper part 8 using a bracket 24. The lower part 10 comprises a first sub-part 10A and a second sub-part 10B. The second subpart 10B functions to close the underside of the power base 4 and may thus be considered to be a lower cover. The first and second sub-parts 10A, 10B may be attached together by any suitable means, e.g. by a friction fitting. As visible in Figure 3, the first sub-part 10A comprises a cable receiving portion 26 which is integrally formed therewith. The cable receiving portion 26 is shaped and dimensioned to receive the power supply cable 12. A cable securing means 28, in the form of a clamping element, is also included. In the embodiment depicted, the cable securing means 28 is configured so as to be attached to the first sub-part 10A, thereby securing the power supply cable 12 in place, using two screws.

[0111] The first sub-part 10A comprises a plurality of feet 30. The second sub-part 10B comprises a plurality of openings 32, shaped to receive the feet 30 such that they extend therethrough. As such, when assembled, the feet 30 are positioned to rest on a work surface, e.g. a countertop.

[0112] In the embodiment depicted, the power supply cable 12 comprises three cores, a live core 12A, a neutral core 12B and an earth core 12C. Each of the cores 12A, 12B, 12C may be connected directly to corresponding terminals on the cordless electrical connector 14. In other embodiments, whilst not shown, the power supply cable 12 may be connected to an intermediate electrical component, e.g. an electronic controller.

[0113] In the embodiment depicted, the power base 4 comprises a weight sensor 34 comprising four sub-sensors 34A, 34B, 34C, 34D. Whilst four sub-sensors are shown, it will be appreciated that any suitable number of sub-sensors may be utilised. The first sub-part 10A of the lower part 10 comprises sensor receiving portions 36 on to which the four sub-sensors 34A-34D are seated.

[0114] In the embodiment shown, the feet 30 are positioned directly below the sensor receiving portions 36. This may help to ensure that the first part 10, specifically the first sub-part 10A is sufficiently rigid when the removable appliance part 6 is seated thereon. This may help to ensure that the sub-sensors 34A-34D provide an accurate weight measurement.

[0115] The first sub part 10A may also comprise an opening 38 into which the indicator means 16 may be mounted. The indictor means 16 may be configured to output a measurement of the volume of the contents of the removable appliance part 6, when seated on the power base 4. The volume may be determined directly from the weight measured by the weight sensor 34.

[0116] Suitably electronic control circuitry (not shown) may be provided to determine the weight, and thus the volume of the contents of the removable appliance part, and provide a suitable output on the indicator means 16. Figure 4 shows an underside view of the assembled power base 4, with the second sub-part 10B removed. This view more clearly shows each of the four feet 30 of the first sub-part 10A. An outer wall 40 of the first sub-part 10A comprises a cut-out 42 through which the power supply cable 12 extends. As shown in Figure 4, when assembled, the power supply cable 12 is received in the cable receiving portion 26 and is secured in position using the cable securing means 28. As shown in this Figure, the power supply cable 12, e.g. the live, neutral and earth cores 12A, 12B, 12C may be connected directly to the cordless electrical connector 14.

[0117] As will be appreciated by those skilled in the art, by securing the power supply cable 12 to the lower part 10, i.e. the first sub-part 10A, forces applied through the cable portion 44 outside of the power base 4 are not transferred to the cable portion 46 which is inside the power base. Instead, the forces are applied directly to the first sub-part 10A, i.e. the lower part. As a result, the forces may have less, or no, impact on any readings by the weight sensor 34. The portion of the power supply cable 12 beneath the cable securing means 28, within the cable receiving portion 26, may be held therein such that it cannot move relative to the lower part 10. This arrangement may serve to prevent the transfer of force from the power supply cable 12 to any part of the power base 4, other than the lower part 10.

[0118] As can be seen most clearly in Figure 4, the cable securing means 28 secures the power supply cable 12 at a position along its length which is spaced from the point of electrical connection between the power supply cable 12 and the cordless electrical connector 14 (i.e. an electrical component of the power base 4). The cable securing means 28, as depicted, may secure against a common outer sheath 12D which surrounds each of the live, neutral and earth cores, 12A, 12B, 12C. Each of the live, neutral and earth cores 12A, 12B, 12C comprises an electrical termination which is connected to the cordless electrical connector 14.

[0119] Figure 5 shows a side-on cross-sectional view of the removable appliance part 6 and power base 4. As visible in this cross-section, the removable appliance part 6 comprises a cordless electrical adaptor 48 which is configured to mate with the cordless electrical connector 14 on the power base 4 when it is seated thereon during use. In the embodiment depicted, the removable appliance part 6 is in the form of a liquid heating vessel which comprises a liquid receiving chamber 50 which is heated by a heating element 52, e.g. a sheathed electrical heating element. The heating element 52 is electrically connected to the cordless electrical adaptor 48 such that when the removable appliance 6 is seated on the power base 4 it is in electrical connection therewith. As visible in Figure 5, the skirt 20 of the upper part 8 rests on each of the sub-sensors 34A-34D, although only sub-sensors 34A, 34C are visible in this Figure. The upper part 8 is dimensioned such that there is a small gap 54 between, i.e. around, the skirt 20 and the first sub-part 10A.

[0120] As such, the upper part 8 can freely move vertically with respect to the first sub-part 10A of the lower part 10.

[0121] As will be appreciated by those skilled in the art, in the embodiment shown in this Figure, the upper part 8 rests entirely on the weight sensor 34, specifically the sub-sensors 34A-34D. As such, when the removable appliance part 6 is seated on the upper part 8, all of the weight of the removable appliance part 6 is transferred down through the weight sensor 34. In other words, all vertical downward force is transferred through the weight sensor 34. Any forces which interact between the cordless electrical connector 14 and cordless electrical adaptor 48 will have negligible, or no, impact on the weight measured.

[0122] The power base 4 may comprise a control circuit 35, as shown in Figure 5. The control circuit 35 may be connected to the weight sensor 34 and the indicator means 16. The control circuit 35 may be in the form of a controller comprising a processor. The control circuit 35 may process the measurement from the weight sensor 34 and convert this measurement into a volume of liquid contained within the removable appliance part 5.

[0123] As will be appreciated by those skilled in the art, the power base 4 of the embodiments set out above may advantageously provide a more accurate measurement of the weight of the removable appliance part 6, and thus the contents thereof.

[0124] Figure 6 shows an embodiment of a cordless appliance 102 in accordance with another embodiment of the present invention. A power base 104 in accordance with another embodiment of the present invention is also depicted. Unlike the previous embodiment described above wherein the power base 4 comprises a weight sensor 34 including a plurality of sub-sensors 34A-34D, in the embodiment shown in Figure 6 the power base 104 includes a single weight sensor 134. The single weight sensor 134 is nonetheless arranged between the upper part 108 and the lower part 110, specifically the first sub-part 110A thereof.

[0125] The upper part 108 comprises a skirt 120 similar to the embodiment set out above. However, as there is only a single weight sensor 134, the skirt 120 comprises tabs 156 which rest on a rim 158 on the first sub-part 110A. As such, when the removable appliance part 106 is seated on the power base 106, some of the force transferred through the upper part 108 will be transferred directly into the lower part 110, specifically the first sub-part 110A, rather than through the weight sensor 134. However, the control circuitry / electronics to which the weight sensor 134 may be connected may be configured to take this into account. For example, the skirt 120 may be configured and the weight sensor 134 arranged such that, for example, 20% of the force is transferred through the weight sensor 134. Any measured force may then be scaled up to reflect the actual force and thus weight of the removable appliance part 106. However, this may not work particularly well when the removable appliance part 106 has a centre of gravity that is not substantially aligned with a centreline of the removable appliance part 106.

[0126] Thus, in some embodiments, the removable appliance part 106 may be specifically configured to have a centre of gravity that is aligned with its centreline. With continued reference to Figure 6, the centre of gravity of a typical removable appliance part 106, in the form of a liquid heating appliance, is typically located away from the centreline (indicated by dashed line 164) and towards the handle 166 of the removable appliance part 106. The black cross 160 indicates the typical centre of gravity of such a removable appliance part. However, in the embodiment depicted, the removable appliance part 106 is modified so as to bring the centre of gravity closer to the centreline 164. In the embodiment depicted, the centre of gravity of the removable appliance part 106 is indicated by the black cross 162, which is substantially aligned with the centreline 164. Shifting of this centre of gravity 162 of the removable appliance part 106 is achieved by a number of modifications in the embodiment depicted.

[0127] Firstly, control electronics 168 in the removable appliance part 106 may be moved to a position whereby they are as far away as possible from the handle 166, within the constraints of the removable appliance part 106. As visible in Figure 6, the control electronics 168 are situated on the far right-hand side of removable appliance part, distal from the handle 166.

[0128] Secondly, the heating element 152 and heat diffuser plate 170 may be configured so as to reduce the amount of weight on the side of the centreline 164 proximal to the handle 166. Figure 7 shows the heating element 152 and heat diffuser plate 170, of the removable appliance part 106, in isolation. As shown here, the heating element 152 follows a circular shape with a void 174 where cold tails 172 are provided for electrical connection to the heating element 152. In the space adjacent the void 174, the heat diffuser plate comprises a corresponding cut-out 176. The result of this arrangement is that the weight of the heating element 152 and heat diffuser plate 170 assembly is less on the left-hand side of Figure 7 than on the right-hand side. With reference back to Figure 6, by arranging the heating element 152 and heat diffuser plate 170 in a manner in which the void 174 and cut-out 176 are on the side of the centreline 164 proximal to the handle 166, the weight of the removable appliance part on the left-hand side of the centreline 164 shown in Figure 6 may be reduced. The result is that the centre of gravity 162 may be moved closer to the centreline 164. Of course, any other components of the removable appliance part 106 may be rearranged so as to align the centre of gravity 162 more closely with the centreline 162. Bringing the centre of gravity 162 as close as possible to the centreline 162 of the removable appliance part 106 may allow the power base 104 to include a single weight sensor 134, as irrespective of the angular orientation of the removable appliance 106 relative to the power base, the amount of force applied through the upper part 108 onto the weight sensor 134 will be substantially the same.

[0129] Figure 8 shows a view of the underside of the power base 104 shown in Figure 6. The power base 104 is the same as the power base 4 of the first embodiment set out above, except for the provision of a single weight sensor 134, as opposed to a plurality of sub-sensors. As such, the power supply cable 112 of this embodiment is secured in an identical manner to the first subpart 110A using a cable securing means.

[0130] Figure 9 shows a view of the power base 104 described above. As can be seen more clearly in this Figure, the upper part 108 comprises a plurality of tabs 156 which, when assembled, rest on the rim 158 of the lower part 10. The single weight sensor 134 can also be seen. The tabs 156 and single weight sensor 134 may be equiangularly distributed around the rim 158.

[0131] Figure 10 shows an underside view of a lower part 210 in accordance with another embodiment of the present invention. As depicted, unlike the previous embodiments in which the cable securing means is in the form of a separate clamping element attached to the lower part, in this embodiment the cable securing means 228 is integrally formed with the lower part 210. The cable securing means 228 may take any suitable form. In the embodiment depicted, as will be appreciated by those skilled in the art, when a power supply cable is pushed against the cable securing means 228, the cable securing means 228 will initially displace allowing the power supply cable to move into the cable receiving portion 226. Once in the cable receiving portion 226, the cable securing means 228 may press against the power supply cable and hold it therein. Integrally forming the cable securing means 228 with the lower part may reduce the number of separate components which have to be both manufactured and assembled.

[0132] Figure 11 shows a flow chart of steps which may be performed by control circuitry which may be present in any of the embodiments described herein. For ease of reference, the steps will be described with reference to the electrical appliance 2 shown in Figures 1 to 5. In step S1 , the control electronics determine, using the weight sensor 34, a first amount of liquid within the removable appliance part 6. Then, in step S2, the control electronics detect when the removable appliance part 6 has been removed from, e.g. so as to pour heated liquid from the removable appliance part 6, and subsequently placed back on the power base 4. After this detection, in step S3, a determination is made, using the weight sensor 34, of a second amount, i.e. the remaining amount, of liquid within the removable appliance part 6. Following this, at step S4, a determination may be made as to the difference between the first and second amounts, and this difference may be compared to a threshold. If the amount is less than a threshold, i.e. only a small amount has been poured out, in step S5 a signal may be sent to a user alerting means to indicate an overfill having occurred.

[0133] In step S2, detection of the removable appliance part 6 being lifted away, and placed back on, the power base 4 may be achieved using the weight sensor 34.

[0134] Figure 12 shows a perspective view of a power base 302 in accordance with another embodiment. The power base 302 is substantially the same as the first embodiment set out above, except that the power base 302 further comprises user-alerting means 378. The user alerting means 378 may comprise, for example, three lights, e.g. three light emitting diodes (LEDs). Each of the LEDs may have a different colour, e.g. red, yellow and green. The useralerting means 378 may be in addition to the indicator means 316. The user-alerting means 378 may be used to provide an output relating to the steps according to Figure 11 , described above. For example, if it is determined that an over-fill has occurred. A red user-alerting means 378 may be illuminated. In contrast, if no over-fill is detected, a green user-alerting means 378 may be illuminated.

[0135] Figure 13 shows a perspective view of an electrical appliance 402 in which in addition, or alternatively, to an indicator means 416 arranged on the power base 404, an indicator means 480 may be arranged on the removable appliance part 406. The indicator means 480 may similarly comprise an LCD display or LED display. The indicator means 480 may also provide an indication relating to a weight, e.g. a volume of liquid within the removable appliance part 406, measured by a weight sensor in the power base 404. Otherwise, the electrical appliance 402 is identical to the appliance 2 described above.

[0136] Figure 14 shows a side cross-sectional view through an electrical appliance 502 in accordance with another embodiment of the present invention. In this embodiment, the power base 504 comprises an inductive heater 582 and the removable appliance part 506 comprises a susceptor 584. The susceptor 584 is arranged to heat the contents of the liquid chamber 550. The inductive heater 582 may comprise an inductor coil. With the exception of the cordless electrical connector being removed, the power base 504 is otherwise identical to the power base 2 described above in relation to its inclusion of weight sensors and the relative arrangement of the upper part and lower part. When the removable appliance part 506 is seated on the power base 504, specifically the upper part 508 thereof, the weight force is transferred down to the weight sensors 534. Whilst not shown in this Figure, the power base 504 comprises a power supply cable secured to the lower part 510 of the power base 504.

[0137] Figure 15 shows an exploded view of a power base 604 in accordance with another embodiment of the present invention. The power base 604 is identical to the power base 4 described above, except for the power base 604 shown in this embodiment comprises at least one resiliently biased member 635A, e.g. a plurality of resiliently biased members 635A-635D arranged between the upper part 608 and lower part 610. The at least one resiliently biased member 635A-365D may act to push the upper part 608 away from the lower part 610. The upper part 608 may be prevented from separating completely from the lower part 10 due to the engagement between the L-shaped slot 622 and pin. The at least one resiliently biased member 635A-635D may function to prevent the upper part 608 from rattling with respect to the lower part 610. Whilst resiliently biased members 635A-635D are depicted which act to push the upper part 608 away from the lower part 610, it is envisaged that alternative resiliently biased members may act to pull the upper part 608 towards the lower part 610. The at least one resiliently biased member 635A-635D may be integrally formed with at least one of the upper part 608 or lower part 610. As depicted, the at least one resiliently biased member 635A- 635D may be in the form of a coiled spring. However, the at least one resiliently biased member 635A-635D may take any other suitable form. Whilst four resiliently biased members 635A-635D are shown, any number of resiliently biased members may be utilised.

[0138] Figure 16 shows a perspective view of a system comprising a cordless electrical appliance 702 and a scale part 703 in accordance with an embodiment of the present invention. The cordless electrical appliance 702 comprises a power base 704 in accordance with an embodiment of the present invention, as well as a removable appliance part 706. In the embodiment depicted, the removable appliance part 706 is in the form of a liquid heating vessel, although any other suitable removable appliance part may be used. Whilst not visible in the Figure, the removable appliance part 706 comprises a heating element configured to heat the contents of the removable appliance part 706.

[0139] The power base 704 is essentially the same as the power base 4 of Figure 1, except that the power base 704 comprises a detection means in the form of a magnetic field sensor, in particular a reed switch (not shown), for detecting a magnet and electronic control circuitry that is configured to operate the power base 704 in a weighing scale mode, as will be described in more detail below. The power base 704 comprises a weight sensor in the same form as the weight sensor of the power base 4 shown in Figure 3.

[0140] The power base 704 comprises an energy transmission means in the form of a cordless electrical connector 714 that extends upwards from an upper surface 705 of the power base 704. The power base 704 is arranged, in a first configuration 725a (as shown in Figure 18), to receive the removable appliance part 706 thereon. In a second configuration 725b, as depicted in the lower part of Figure 16, the power base 704 is arranged to receive the scale part 703 thereon. The power base 704 is arranged to receive the removable appliance part 706 and the scale part 703, in the first and second configurations respectively, on the upper surface 705 of the power base 704. When in the second configuration 725b, an object to be weighed may be placed upon the scale part 703.

[0141] Three embodiments of the scale part 703 are shown in Figure 16. In a first embodiment, the scale part 703a is substantially flat and is shaped to match the shape of the power base 704. In a second embodiment, the scale part 703b is substantially flat and is shaped to cover only the electrical connector 714 of the power base 704. In a third embodiment, the scale part 703c is bowl-shaped and comprises a base portion 707 that is shaped to cover the electrical connector 714 of the power base 704.

[0142] Figure 17 shows a cross-sectional view of the power base 704 and the scale part 703a of Figure 16.

[0143] The scale part 703a comprises a substantially flat upper surface 709, which may allow an object to be placed stably on the scale part 703a so that the object can be weighed. The flat upper surface 709 is also suitable for stably receiving a bowl, e.g. for more easily weighing liquids or grains.

[0144] The flat upper surface 709 extends across the width of the power base 704. A side wall 711a extends downwardly from the perimeter of the upper surface 709 such that, when the scale part 703a is received on the power base 704, the side wall 711a rests on the upper surface 705 of the power base 704. The scale part 703a also comprises ribs 711b which extend inwardly from an inner surface of the side wall 711a to increase the rigidity of the scale part 703a. The ribs 711b extend inwardly towards a central circular cavity 713 that is shaped to receive the electrical connector 714 of the power base 704 when the scale part 703a is received on the power base 704. The upper surface 709 of the scale part 703a acts as a cover for the electrical connector 714, which may help to avoid damaging the electrical components of the power base 704 during weighing operations. The scale part 703a further comprises a skirt 753 that extends past the upper surface 705 of the power base 704 when the scale part 703a is received in the power base 704.

[0145] The scale part 703a further comprises a magnet 715 that is mounted beneath the upper surface 709, inwardly of the side wall 711a. The power base 704 comprises a detection means in the form of a reed switch 717 for detecting the presence of the magnet 715 when the scale plate 703a is received on the power base 704. In other embodiments, the detection means is in the form of a Hall effect sensor 717. The reed switch 717 is arranged below the upper surface 709 of the power base 704.

[0146] The reed switch 717 is configured to signal to the electronic control circuitry 727 in the power base 704 when the magnet 715 is detected. When the signal is received, the electronic control circuitry 727 automatically performs a zeroing operation in which a measurement from the weight sensor (not shown) is retrieved and is subsequently subtracted from future weight measurements. The zeroing operation may also be initiated by a user via a push-button 723. The electronic control circuitry 727 may comprise a controller which may comprise a processor, e.g. a microprocessor.

[0147] An indicator means 716 (here embodying an output means) of the power base 704 provides an indication regarding the weight measured by the weight sensor within the power base 704, after the weight of the scale plate 703a itself has been subtracted. The indicator means 716 is configured to provide the indication as a weight indication (e.g. in grams or pounds) and / or as a volume indication (e.g. in ml or fl oz), as discussed above. In this embodiment, the indicator means 716 comprises a display 716a, which is an electronic display screen, and a controller 716b for controlling the display 716a.

[0148] Figure 18 shows a perspective view of the system of Figure 16 in which the scale part 703b is shown in a storage configuration.

[0149] As shown in Figures 16 and 18, the removable appliance part 706 comprises a vessel 719 that is closed by a lid 721. The lid 721 comprises a circular recess 721a that is shaped to receive the scale part 703b by a friction fitting. This allows the scale part 703b to be stored conveniently with the removable appliance part 706 when the scale part 703b is not being used, i.e. when it is not positioned on the power base 704. As depicted in Figure 18, the scale part 703b may be removed from the removable appliance part 706 and placed on the power base 704 so as to convert the power base 704 into a weighing scale. The electronic control circuitry 727 of the power base 704 may be configured to detect when the removable appliance part 706 is received on the power base 704 by detecting a closed circuit condition between the cordless electrical connector 714 and the corresponding cordless electrical adaptor (shown in Figure 5) of the removable appliance part 706. The electronic control circuitry 727 of the power base 704 may be configured to perform a zeroing operation when it detects that the removable appliance part 706 has been received on the power base 704. The zeroing operation comprises subtracting from subsequent weight measurements a stored value representative of the weight of the removable appliance part when empty.

[0150] As can be seen in Figure 18, when the removable appliance part 706 is received on the power base 704, the indicator means 716 is configured to provide the weight indication as a number of cups (i.e. a volume indication). When the scale part 703b is received on the power base 704, the indicator means 716 is configured to provide the weight indication in grams (i.e. as a weight).

[0151] Figure 19 shows a cross-sectional view of a cordless electrical connector 814 of a power base 804 in accordance with a further embodiment of the present invention. The cordless electrical connector 814 is a 360° cordless connector and is configured to mate with a corresponding 360° cordless electrical adaptor 848 of a removable appliance part 806 when the removable appliance part 806 is received on the power base 804. The cordless electrical connector 814 is also configured to mate with a corresponding adaptor 848a of a scale part 803, in accordance with an embodiment of the invention.

[0152] In the embodiment depicted, the cordless electrical adaptor 848, of the removable appliance part 806, is a 3-pole adaptor comprising a live pin 829, a neutral ring conductor 831, and an earth ring 833. The electrical connector 814 is a 3-pole connector comprising a central aperture 835 for receiving the live pin 829, a first coaxial annular aperture 837 for receiving the neutral ring conductor 831 , and a second coaxial annular aperture 839 for receiving the earth ring 833. First and second electrical contacts 835a, 837a housed in the central aperture 835 and first coaxial annular aperture 837, respectively, contact the live pin 829 and neutral ring conductor 831 respectively, to connect the live and neutral poles to form a power supply circuit when the electrical connector 814 and the electrical adaptor 848 are brought together. A third electrical contact 833a is provided in the second coaxial annular aperture 839 for contacting the earth ring 833 when the electrical connector 814 and the electrical adaptor 848 are brought together.

[0153] When a connection is made between all three poles of the cordless electrical connector 814 and corresponding cordless electrical adaptor 848, i.e. when a closed circuit between all poles is formed, it may be determined by suitable circuitry on the power base 804 that the removable appliance part 806 has been received on the power base 804.

[0154] The scale part 803 may comprise an integrated cordless adaptor 848a, as depicted in Figure 19. The cordless electrical adaptor 848a may be substantially the same as the cordless electrical adaptor 848 of the power base 806, except for missing the live pin 829. Instead, the cordless electrical adaptor 848a simply comprises a neutral ring conductor 831a and an earth ring 833a, each of which may be electrically connected together within the cordless electrical adaptor 848a. When the scale part 803 is received on the power base 804, as will be appreciated, only the neutral and earth poles are connected, and the live pole is not connected. This may be detected by suitable circuitry on the power base 804 and may provide a means for determining that the scale part 803 has been received on the power base 804, rather than the removable appliance part 806.

[0155] Whilst the embodiment shown in Figure 19 comprises a 3-pole cordless electrical connector 814 and cordless electrical adaptor 848, it will be appreciated that the connector and adaptor may comprise any suitable number of poles, e.g. 5 poles.

[0156] Figure 20 shows a schematic of a system comprising an induction heating appliance 902, comprising a removable appliance part 906 and a power base 904, and a scale part 903 in accordance with another embodiment of the present invention. The removable appliance part 906 comprises a ferromagnetic susceptor 941 arranged at the base of a vessel 919 of the removable appliance part 906.

[0157] The power base 904 is essentially the same as the power base 704 of Figure 16 except that the power base 904 comprises an induction element in the form of an induction coil 943, instead of an electrical connector 714. When a current is passed through the induction coil 943, a magnetic field is generated. When the removable appliance part 906 is received on the power base 904 and the induction coil 943 is energised, the ferromagnetic susceptor 941 experiences the magnetic field and generates heat to heat the contents of the vessel 919.

[0158] The underside of the power base 904 comprises a recess 945 configured to removably receive the scale part 903 in a storage configuration. The power base 904 comprises a male bayonet fitting connector part 947a, arranged centrally within the recess 945. The male bayonet fitting connector part 947a is configured to engage with a corresponding female bayonet fitting connector part 947b defined in the scale part 903 when the scale part 903 is received in the recess 945 in the storage configuration. The removable appliance part 906 comprises an aperture 951 at the top of the appliance 906 through which the vessel 919 can be filled, e.g. with liquid to be heated. In some embodiments, the aperture 951 is shaped to receive the scale part 903 removably therein in an alternative storage configuration such that the scale part 903 acts as a lid for the vessel 919 when the scale part 903 is received within the aperture 951. The scale part 903 may be configured to be removably received within the aperture 951 of the removable appliance part 906 by a friction fitting.

[0159] Figure 21 shows a schematic view of another embodiment of the present invention in which the scale part 1003 is attached to the power base 1004 by means of a hinge. The scale part 1003 is hingedly movable between a storage configuration, as shown in Figure 21 , and a deployed configuration in which the scale part 1003 is received on an upper surface 1005 of the power base 1004.

[0160] While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.

Claims

Claims1. A power base for receiving a removable appliance part thereon, the power base comprising: an upper part configured to receive, in use, the removable appliance part thereon; a lower part, separate to the upper part, arranged below the upper part; a weight sensor arranged between the upper part and the lower part; a power supply cable configured to supply the power base with electrical power; and a cable securing means configured to secure the power supply cable to the lower part.

2. The power base of claim 1 , a cordless electrical connector for providing an electrical connection to the removable appliance part when seated on the power base, wherein the cordless electrical connector extends from the upper part and is positioned so as to mate with a corresponding cordless electrical adaptor on the removable appliance part when it is received thereon.

3. The power base of any preceding claim, wherein the cable securing means is integrally formed with the lower part.

4. The power base of claim 1 or 2, wherein the cable securing means comprises a clamping element configured to be attached to the lower part so as to secure the power supply cable to the lower part.

5. The power base of any preceding claim, wherein the lower part comprises a cable receiving portion, integrally formed therein, shaped to receive the power supply cable.

6. The power base of any preceding claim, wherein the cable securing means is configured to hold the power supply cable against the lower part.

7. The power base of any preceding claim, wherein the cable securing means is configured to secure the power supply cable to the lower part in a manner in which at least at the portion of the power supply cable which is secured to the lower part cannot be moved relative to the lower part.

8. The power base of any preceding claim, wherein the weight sensor comprises a plurality of sub-sensors spatially distributed between the upper part and lower part.

9. The power base of claim 8, wherein the plurality of sub-sensors are evenly spatially distributed between the upper part and the lower part.

10. The power base of any preceding claim, wherein the weight sensor comprises at least one strain gauge.

11. The power base of any preceding claim, wherein the weight sensor is arranged between the upper part and lower part in a manner such that all downward vertical force applied to the upper part is applied through the weight sensor.

12. The power base of any preceding claim, wherein the upper part and lower part together define a housing of the power base.

13. The power base of claim 12, wherein the power supply cable extends from the housing.

14. The power base of any preceding claim, further comprising an indicator means configured to provide an indication relating to the weight measured by the weight sensor.

15. The power base of any preceding claim, wherein the power base is for receiving a removable appliance part in the form of a liquid heating vessel, and wherein the power base further comprises a control circuit configured to: determine, using the weight sensor, a first amount of liquid within the removable appliance part when the removable appliance part is positioned on the power base; detect when the removable appliance part has been removed from the power base and subsequently placed back on the power base; and after said detection, determine, using the weight sensor, a second amount of liquid within the removable appliance part.

16. The power base of claim 15, wherein the control circuit is further configured to determine whether the difference between the first amount of liquid and the second amount of liquid is less than a threshold.

17. The power base of claim 16, wherein the control circuit is configured, in response to determining that the difference is less than the threshold, to send a signal for triggering a useralerting means arranged to alert a user that an over-fill has occurred.

18. The power base of any preceding claim, wherein a control circuit is configured to use the weight sensor to determine when the removable appliance part has been removed from, and placed back on, the power base.

19. The power base of any preceding claim, wherein the power base is configured to receive a removable appliance part substantially irrespective of the angular orientation of the removable appliance part relative to the power base.

20. An electrical appliance comprising: a power base of any preceding claim; and a removable appliance part configured to be seated on the power base.

21. The electrical appliance of claim 20, wherein the removable appliance part is a liquid heating vessel.

22. The electrical appliance of claim 20 or 21 , wherein the removable appliance part comprises an indicating means configured to provide an indication relating to the weight measured by the weight sensor.

23. The electrical appliance of claim 20, 21 or 22, wherein the removable appliance part is configured such that its centre of gravity is substantially aligned with a centerline extending through the removable appliance part and wherein the weight sensor in the power base comprises a single weight sensor.

24. A power base for receiving in a first configuration a removable appliance part and in a second configuration a scale part configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; an output means configured to output an indication relating to the weight measured by the weight sensor; and a detection means configured to detect when the scale part is received on the power base; wherein the output means is configured to output the indication relating to the weight measured by the weight sensor when the detection means detects that the scale part is received on the power base.

25. The power base of claim 24, wherein the scale part comprises a magnet mounted thereto, and wherein the detection means comprises a magnetic field sensor arranged to detect the presence of the magnet when the scale part is received on the power base.

26. The power base of claim 25, wherein the detection means comprises a reed switch.

27. The power base of claim 25, wherein the detection means comprises a Hall effect sensor.

28. The power base of any of claims 24 to 27, wherein the detection means is further configured to detect when the removable appliance part is received on the power base.

29. The power base of claim 28, wherein the energy transmission means comprises an electrical connector configured to mate with a corresponding electrical adaptor on the removable appliance part, and wherein the detection means comprises circuitry for detecting a closed circuit when the electrical connector mates with the corresponding electrical adaptor.

30. The power base of claim 28 or 29, wherein the output means is configured, in response to the detection means detecting that: the scale part is not received on the power base; and the removable appliance part is not received on the power base, not to output the indication of the weight measured by the weight sensor.

31. The power base of any of claims 24 to 30, wherein the output means is configured, in response to the detection means detecting that the scale part is not received on the power base, not to output the indication of the weight measured by the weight sensor.

32. The power base of any of claims 24 to 31 , wherein the detection means comprises circuitry configured to use the weight measured by the weight sensor to determine when the scale part and / or the removable appliance part is received on the power base.

33. The power base of claim 32, wherein the circuitry is configured to compare a weight measurement obtained by the weight sensor with a scale part reference weight representative of the weight of the scale part and / or a removable appliance part reference weight representative of the minimum weight of the removable appliance part.

34. The power base of any of claims 24 to 33, wherein the output means is configured, when the detection means detects that the scale part is received on the power base, to discount the weight of the scale part when outputting the indication relating to the weight measured by the weight sensor.

35. The power base of any of claims 28 to 34, wherein the output means is configured, when the detection means detects that the removable appliance part is received on the power base, to output the indication relating to the weight measured by the weight sensor36. The power base of claim 35, wherein the output means is configured, when the detection means detects that the removable appliance part is received on the power base, to discount a removable appliance part reference weight when outputting the indication relating to the weight measured by the weight sensor.

37. The power base of any of claims 28 to 36, wherein the output means comprises circuitry configured to calculate, in response to the detection means detecting that the removable appliance part is received on the power base, a liquid volume of the contents of the removable appliance part using the weight measured by the weight sensor, and wherein the indication relating to the weight comprises the calculated liquid volume.

38. The power base of any of claims 24 to 37, wherein the energy transmission means comprises an electrical connector configured to mate with a corresponding electrical adaptor on the removable appliance part.

39. The power base of claim 38, wherein the electrical connector comprises at least three electrical contacts, and wherein, when a connection is made between at least two, but not all, of the plurality of electrical contacts, the detection means is configured to detect that the scale part is received on the power base.

40. The power base of claim 38 or 39, wherein the electrical connector of the energy transmission means is a 360° cordless connector.

41. The power base of any of claims 24 to 37, wherein the energy transmission means comprises an induction element for inducing heating in a susceptor of the removable appliance part.

42. The power base of any of claims 24 to 41 , wherein the output means comprises a display and a controller for controlling the display.

43. The power base of claim 42, wherein the display comprises an electronic display screen.

44. A system comprising the power base of any of claims 24 to 43 and a scale part configured to convert the power base into a weighing scale.

45. The system of claim 44, wherein the energy transmission means comprises an electrical connector, and wherein the scale part is shaped to cover the electrical connector when the scale part is received on the power base.

46. The system of claim 44 or 45, wherein the scale part comprises a flat upper surface.

47. The system of any of claims 44 to 46, wherein the scale part comprises a bowl.

48. The system of any of claims 44 to 47, wherein the scale part is removably attachable to the power base by a bayonet fitting.

49. The system of any of claims 44 to 47, wherein the scale part is hingedly connected to the power base.

50. The system of any of claims 44 to 48, wherein the system further comprises the removable appliance part and wherein the scale part is removably attachable to the removable appliance part.

51. The system of claim 50, wherein the removable appliance part comprises a vessel, and wherein the scale part is removably attachable to the removable appliance part as a lid for the vessel.

52. The system of claim 50, wherein the removable appliance part comprises a vessel and a lid for closing the vessel, wherein the scale part is configured to be removably received on or within the lid of the removable appliance part.

53. The system of any of claims 50 to 52, wherein the scale part is removably attachable to the removable appliance part by a friction fitting.

54. The system of any of claims 44 to 53, wherein the scale part is arranged to extend over the entire upper surface of the power base when the scale part is received on the power base.

55. The system of any of claims 44 to 54, wherein the scale part comprises a skirt configured to extend over the power base when the scale part is received on the power base, wherein the skirt is configured to extend past the upper surface of the power base.

56. A system comprising a scale part and a power base for receiving in a first configuration a removable appliance part and in a second configuration the scale part thereon, wherein the scale part is configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; and an output means configured to output an indication relating to the weight measured by the weight sensor; wherein: the power base is configured to receive the scale part in a storage configuration in which the removable appliance part can be received directly on the power base so as to receive energy from the energy transmission means.

57. A system comprising a scale part, a removable appliance part, and a power base for receiving in a first configuration the removable appliance part and in a second configuration the scale part thereon, wherein the scale part is configured to convert the power base into a weighing scale, the power base comprising: an energy transmission means for transferring energy to the removable appliance part when the removable appliance part is received on the power base; a weight sensor for measuring a weight of an object received on the power base; and an output means configured to output an indication relating to the weight measured by the weight sensor; wherein: the removable appliance part is configured to receive the scale part in a storage configuration in which the removable appliance part can be received directly on the power base so as to receive energy from the energy transmission means.

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