EP1500171A1 - Improvements relating to cordless electrical appliances - Google Patents

Improvements relating to cordless electrical appliances

Info

Publication number
EP1500171A1
EP1500171A1 EP03718933A EP03718933A EP1500171A1 EP 1500171 A1 EP1500171 A1 EP 1500171A1 EP 03718933 A EP03718933 A EP 03718933A EP 03718933 A EP03718933 A EP 03718933A EP 1500171 A1 EP1500171 A1 EP 1500171A1
Authority
EP
European Patent Office
Prior art keywords
connector
appliance
power base
plug
cordless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03718933A
Other languages
German (de)
French (fr)
Inventor
Robert Andrew O'neill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otter Controls Ltd
Original Assignee
Otter Controls Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otter Controls Ltd filed Critical Otter Controls Ltd
Publication of EP1500171A1 publication Critical patent/EP1500171A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
    • H01R13/631—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only
    • H01R13/6315—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only allowing relative movement between coupling parts, e.g. floating connection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • H01R13/7137—Structural association with built-in electrical component with built-in switch the switch being a safety switch with thermal interrupter

Definitions

  • This invention concerns improvements relating to cordless (as opposed to corded) appliances wherein electricity is provided to the appliance proper through a corded base unit (otherwise known as a power base) upon which the appliance proper may be removably seated so as to cause complementary electrical connectors that are provided in the appliance proper and in the base unit to interengage for supplying electricity through the base unit to the appliance proper.
  • a corded base unit otherwise known as a power base
  • the invention will be described by reference to cordless liquid heating appliances, particularly though not exclusively water heating appliances such as kettles and hot water jugs for example, but it is to be understood that the invention has wider application.
  • Cordless electric kettles and hot water jugs are well known. Such appliances originally had their complementary electrical connectors so configured that the appliance proper could be set down onto its base only in a particular orientation, and more recently 360° complementary connector sets have become commonplace, the 360° connector sets enabling the appliance proper to be set down onto its base in any relative orientation.
  • An example of a connector set requiring predetermined orientation is our CS2 connector set which is described in GB-A-2241 390 and examples of a 360° connector set are our CS4/CP7 connector set which is substantially as described in GB-C-2 285 716 and a similar system made and sold by Strix Ltd which is substantially as described in WO-A-9508204.
  • Cordless appliance connectors at present rely on resilient contacts to take up the tolerances inherent in the mating of an appUance proper with its power base.
  • this resilience is in the form of three discrete spring mounted contacts in the power base which mate with three fixed ring contacts in the appliance.
  • the resilience is in the form of spring mounted contacts which move in a horizontal axis, and have a sliding action on the mating rigid contacts.
  • the resilience is in the base component, and on the CS4 the resilience is in the appliance component.
  • a 360° connector set for a cordless electrical apphance comprises an appliance connector having three terminal pins extending fixedly therefrom in a triangular arrangement and a base connector comprising a central terminal and two concentric ring terminals fixedly positioned therein, one of the terminal pins of the appliance connector being adapted to contact the central terminal of the base connector and the two other terminal pins of the apphance connector being adapted to contact respective ones of the ring terminals, the appliance and base connectors being adapted to be mated together and the base connector being adapted to be resiliently mounted in the base unit of a cordless appliance so as to be capable of accommodating a degree of misalignment between the appliance and base connectors and or their respective electrical parts.
  • Fig 1 shows an oblique view of the upper surface of the socket part of the embodiment
  • Fig 2 shows an oblique view of the underside of the socket part
  • Fig 3 is similar to Fig 1, with the contact cover and seal removed to show the contacts;
  • Fig 4 shows a cross section through the socket part
  • Fig 5 shows a cross section through the socket part mounted in the upper moulding of a power base
  • Fig 6 shows a view of the underside of the plug part of the embodiment
  • Fig 7 shows a section through the plug part
  • Fig 8 shows a sectional view of the plug part and power base before engagement
  • Fig 9 shows a sectional view of the plug part and power base in engagement.
  • the socket part of the embodiment consists of a main carrier moulding (1) formed of plastics material and housing two rigid ring contacts (2,3) and a rigid central contact (4).
  • the ring contacts are housed in slots (5), best seen in
  • Fig 4 and have a cover (6) which provides the necessary electrical safety, limiting access to the contacts from above whilst allowing access to the narrow blades of the mating appliance plug part.
  • Each contact is provided with a tab terminal (11,12,13) which projects below the carrier moulding.
  • An optional seal (7) formed of a simple rubber (or elastomer) washer provides additional protection against water spillage and the internal form of the contact carrier is very open to encourage any water which may enter to quickly drain to avoid electrical safety problems.
  • the carrier moulding assembly, with its contacts, is located on a helical compression spring (8) which holds the assembly upwards against the underside of the power base upper surface. The spring is carried by the power base lower cover which is not shown.
  • the socket has a conical skirt (9) which locates in a mating feature on the power base moulding, best seen in Fig 5, and has an anti rotation slot (10) which locates on a rib (not visible) on the power base moulding (14).
  • the spring allows the carrier assembly to move vertically - typically by around 3m - and also to rock by a small amount so that the plane of its upper surface can rotate away from horizontal in any direction by about 3 degrees. This amount of rotation will normally be sufficient to accommodate most expected misalignments, but, as with resilience, if more is required then it can be provided.
  • the mating plug part of the embodiment may take one of two forms. It may either be an X2 element protector control as described in GB-A- 2283 156, with its terminals, including the earth tab, pointing vertically downwards and twisted to lie on arcs whose centre is the axis of the earth tab. Alternatively it may simply be a carrier moulding with three tabs arranged in the same configuration and providing terminals for connection to the apphance internal wiring. Figures 6 to 9 show a separate plug of this latter form.
  • FIG. 6 and 7 show the blade contacts (11) mounted in a housing (12) which incorporates guidance features to facilitate mating of the plug and socket parts of the connector set in a relatively loose and unbinding fashion.
  • the three, non-coplanar, pins can align with the contacts in the socket and can accommodate constructional tolerances, the socket component floating to provide this alignment.
  • the central contact should be the earthed contact.
  • connection of the contacts can be as desired but use of an X2 control as the basis of the plug part would limit the earth to being the central contact because of its geometry.
  • the configuration of the illustrated plug and socket has some similarity to the Strix P72 arrangement, inverted.
  • the rings of the P72 are in the apphance plug, and the spring contacts of the base socket have been replaced by the rigid blades.
  • our arrangement is shown with the rings in the base, they could form the plug contacts, and the rigid blade contacts could be provided in the sprung mounted base socket.
  • the illustrated arrangement is preferred as the components are cheaper.
  • the advantages of the invention provide a simple assembly of rigid parts, which are easier to manufacture, and are more robust in service.
  • the float of the socket in the power base gives the necessary compliance to accommodate manufacturing tolerances, and can be made as great as necessary without compromising other features such as contact force and product height.

Abstract

Cordless electrical appliances, kettles and hot water jugs in particular, are known which have 360° connector sets incorporating spring contacts which have to be carefully designed. To avoid this necessity, the invention proposes a 360° connector set consisting of a plug part having three triangularly arranged pin terminals and a socket part having three complementary coaxial terminals, the plug and socket terminals all being fixed components. The socket part is resiliently mounted in the base unit of the cordless appliance so as to be able to adjust its position to accommodate tolerance variations and/or misalignments between the two parts of the connector set.

Description

IMPROVEMENTS RELATING TO CORDLESS ELECTRICAL A PLIANCES
Field of the Invention: This invention concerns improvements relating to cordless (as opposed to corded) appliances wherein electricity is provided to the appliance proper through a corded base unit (otherwise known as a power base) upon which the appliance proper may be removably seated so as to cause complementary electrical connectors that are provided in the appliance proper and in the base unit to interengage for supplying electricity through the base unit to the appliance proper. In the following, the invention will be described by reference to cordless liquid heating appliances, particularly though not exclusively water heating appliances such as kettles and hot water jugs for example, but it is to be understood that the invention has wider application. Background of the Invention:
Cordless electric kettles and hot water jugs are well known. Such appliances originally had their complementary electrical connectors so configured that the appliance proper could be set down onto its base only in a particular orientation, and more recently 360° complementary connector sets have become commonplace, the 360° connector sets enabling the appliance proper to be set down onto its base in any relative orientation. An example of a connector set requiring predetermined orientation is our CS2 connector set which is described in GB-A-2241 390 and examples of a 360° connector set are our CS4/CP7 connector set which is substantially as described in GB-C-2 285 716 and a similar system made and sold by Strix Ltd which is substantially as described in WO-A-9508204.
Cordless appliance connectors at present rely on resilient contacts to take up the tolerances inherent in the mating of an appUance proper with its power base. In the case of Strix 's P72 360° cordless, this resilience is in the form of three discrete spring mounted contacts in the power base which mate with three fixed ring contacts in the appliance. In the case of our CS2 (conventional cordless) and CS4 (360°) systems the resilience is in the form of spring mounted contacts which move in a horizontal axis, and have a sliding action on the mating rigid contacts. On the CS2 the resilience is in the base component, and on the CS4 the resilience is in the appliance component. These resiliently mounted contacts tend to be somewhat fragile, and may be damaged in use of the appliance, or during assembly of the product. This arises from the need to keep the spring rate low to avoid excessive mating forces which could tend to push the appliance away from its base, or which may prevent the smooth undocking of the appliance, causing the power base to catch and lift with the apphance. Objects and Summary of the Invention: It is the principal object of the present invention to overcome or at least substantially reduce the abovementioned problems.
According to one aspect of the present invention, a 360° connector set for a cordless electrical apphance comprises an appliance connector having three terminal pins extending fixedly therefrom in a triangular arrangement and a base connector comprising a central terminal and two concentric ring terminals fixedly positioned therein, one of the terminal pins of the appliance connector being adapted to contact the central terminal of the base connector and the two other terminal pins of the apphance connector being adapted to contact respective ones of the ring terminals, the appliance and base connectors being adapted to be mated together and the base connector being adapted to be resiliently mounted in the base unit of a cordless appliance so as to be capable of accommodating a degree of misalignment between the appliance and base connectors and or their respective electrical parts.
The above and further aspects of the invention are set forth in the appended claims and will best be understood from consideration of the following detailed description of an exemplary embodiment which is illustrated in the accompanying drawings. Description of the Drawings:
Fig 1 shows an oblique view of the upper surface of the socket part of the embodiment;
Fig 2 shows an oblique view of the underside of the socket part;
Fig 3 is similar to Fig 1, with the contact cover and seal removed to show the contacts;
Fig 4 shows a cross section through the socket part;
Fig 5 shows a cross section through the socket part mounted in the upper moulding of a power base; Fig 6 shows a view of the underside of the plug part of the embodiment;
Fig 7 shows a section through the plug part;
Fig 8 shows a sectional view of the plug part and power base before engagement; and
Fig 9 shows a sectional view of the plug part and power base in engagement. Detailed Description of the Embodiment:
The socket part of the embodiment consists of a main carrier moulding (1) formed of plastics material and housing two rigid ring contacts (2,3) and a rigid central contact (4). The ring contacts are housed in slots (5), best seen in
Fig 4, and have a cover (6) which provides the necessary electrical safety, limiting access to the contacts from above whilst allowing access to the narrow blades of the mating appliance plug part. Each contact is provided with a tab terminal (11,12,13) which projects below the carrier moulding. An optional seal (7) formed of a simple rubber (or elastomer) washer provides additional protection against water spillage and the internal form of the contact carrier is very open to encourage any water which may enter to quickly drain to avoid electrical safety problems. The carrier moulding assembly, with its contacts, is located on a helical compression spring (8) which holds the assembly upwards against the underside of the power base upper surface. The spring is carried by the power base lower cover which is not shown. The socket has a conical skirt (9) which locates in a mating feature on the power base moulding, best seen in Fig 5, and has an anti rotation slot (10) which locates on a rib (not visible) on the power base moulding (14). The spring allows the carrier assembly to move vertically - typically by around 3m - and also to rock by a small amount so that the plane of its upper surface can rotate away from horizontal in any direction by about 3 degrees. This amount of rotation will normally be sufficient to accommodate most expected misalignments, but, as with resilience, if more is required then it can be provided.
The mating plug part of the embodiment may take one of two forms. It may either be an X2 element protector control as described in GB-A- 2283 156, with its terminals, including the earth tab, pointing vertically downwards and twisted to lie on arcs whose centre is the axis of the earth tab. Alternatively it may simply be a carrier moulding with three tabs arranged in the same configuration and providing terminals for connection to the apphance internal wiring. Figures 6 to 9 show a separate plug of this latter form. Either of these configurations provides a set of three downwardly pointing blades (11) arranged so that their axes are not coplanar, their larger flat surfaces are perpendicular to a radius passing through its axis and the axis of the earth tab and their length (projection) is roughly equal. Figures 6 and 7 show the blade contacts (11) mounted in a housing (12) which incorporates guidance features to facilitate mating of the plug and socket parts of the connector set in a relatively loose and unbinding fashion. The three, non-coplanar, pins can align with the contacts in the socket and can accommodate constructional tolerances, the socket component floating to provide this alignment. In the case of this invention it is envisaged that the central contact should be the earthed contact. In practice the connection of the contacts can be as desired but use of an X2 control as the basis of the plug part would limit the earth to being the central contact because of its geometry.
The configuration of the illustrated plug and socket has some similarity to the Strix P72 arrangement, inverted. The rings of the P72 are in the apphance plug, and the spring contacts of the base socket have been replaced by the rigid blades. Although our arrangement is shown with the rings in the base, they could form the plug contacts, and the rigid blade contacts could be provided in the sprung mounted base socket. The illustrated arrangement is preferred as the components are cheaper. The advantages of the invention provide a simple assembly of rigid parts, which are easier to manufacture, and are more robust in service. The float of the socket in the power base gives the necessary compliance to accommodate manufacturing tolerances, and can be made as great as necessary without compromising other features such as contact force and product height.
Having described the invention in the foregoing by reference to an exemplary embodiment it is to be appreciated that modifications and variations thereto could be made without departure from the spirit and scope of the invention as set forth in the appended claims.

Claims

Claims:
1. A cordless electrical appliance comprising an appliance proper and a power base and complementary electrical connectors on the appliance proper and on the power base, the connector on the power base being resiliently mounted so as to be capable of accommodating tolerance variations and minor misalignments in the two connectors.
2. A cordless electrical apphance as claimed in claim 1 wherein said complementary electrical connectors comprise a 360° connector set comprising plug and socket parts, one of said plug and socket parts comprising three concentric terminals and the other of said plug and socket parts comprising pin terminals arranged non-co-linearly for contacting respective ones of the concentric terminals when the plug and socket parts are engaged together, one of said plug and socket parts being fixedly secured in the apphance proper and the other being resiliently mounted in the power base of the cordless appliance whereby a degree of misalignment of the plug and socket parts can be accommodated.
3. A cordless electrical appliance as claimed in claim 2 wherein said 360° connector set comprises an appliance connector having three terminal pins extending fixedly therefrom in a triangular arrangement and a power base connector comprising a central terminal and two concentric ring terminals fixedly positioned therein, one of the terminal pins of the appliance connector being adapted to contact the central terminal of the base connector and the other two terminal pins of the appliance connector being adapted to contact respective ones of the ring terminals.
A cordless electrical appliance as claimed in claim 2 or 3 wherein the electrical connector which comprises three concentric terminals is resiliently mounted in the power base.
5. A cordless electrical appliance as claimed in any preceding claim wherein the connector part on the appliance comprises an integrally formed heating element overtemperature protection control adapted to switch off the supply of electrical energy to the appliance in response to a sensed heating element overtemperature condition.
6. A cordless electrical appliance as claimed in any of the preceding claims wherein the resilient mounting of the respective connector part on the power base is such as to provide a degree of rotation thereof in addition to a degree of tilting movement.
7. A cordless electrical appliance as claimed in any of the preceding claims wherein the connector on the power base has a conical skirt portion, the power base has an accommodating recess with a complementary conical portion, and spring means urges the connector conical skirt portion towards the power base complementary conical portion.
EP03718933A 2002-04-30 2003-04-07 Improvements relating to cordless electrical appliances Withdrawn EP1500171A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0209903A GB2388256B (en) 2002-04-30 2002-04-30 Improvements relating to cordless electrical appliances
GB0209903 2002-04-30
PCT/GB2003/001576 WO2003094307A1 (en) 2002-04-30 2003-04-07 Improvements relating to cordless electrical appliances

Publications (1)

Publication Number Publication Date
EP1500171A1 true EP1500171A1 (en) 2005-01-26

Family

ID=9935820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03718933A Withdrawn EP1500171A1 (en) 2002-04-30 2003-04-07 Improvements relating to cordless electrical appliances

Country Status (5)

Country Link
EP (1) EP1500171A1 (en)
CN (1) CN1650484A (en)
AU (1) AU2003222967A1 (en)
GB (1) GB2388256B (en)
WO (1) WO2003094307A1 (en)

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JP5809463B2 (en) * 2011-07-04 2015-11-11 ケル株式会社 Floating connector
GB201303316D0 (en) * 2013-02-25 2013-04-10 Strix Ltd Cordless electrical appliances
WO2014128510A1 (en) * 2013-02-25 2014-08-28 Strix Limited Cordless electrical appliances
CN103414074B (en) * 2013-08-29 2015-11-25 黄俊龙 A kind of electric kettle
CN105281165A (en) * 2013-08-29 2016-01-27 黄俊龙 Electric kettle base with waterproof cap
CN103441395B (en) * 2013-08-29 2015-11-25 胡小青 A kind of base for electric kettle
CN103441397B (en) * 2013-08-29 2015-12-09 胡小青 Electric kettle
CN105762599A (en) * 2013-09-03 2016-07-13 胡小青 Safer waterproof electric heating kettle
CN105655835A (en) * 2013-09-03 2016-06-08 胡小青 Waterproof-type electric kettle with waterproof caps
CN105914552A (en) * 2013-09-03 2016-08-31 胡小青 Safety type electric kettle with waterproof cap
CN105640313A (en) * 2013-09-03 2016-06-08 胡小青 Safe electric kettle
CN105640312A (en) * 2013-09-03 2016-06-08 胡小青 Electric kettle with safety cap
CN106361144B (en) * 2013-09-03 2018-11-27 乐清市华尊电气有限公司 A kind of base of electric kettle
CN105762597A (en) * 2013-09-03 2016-07-13 胡小青 Waterproof electric kettle improving safety
CN105762598A (en) * 2013-09-03 2016-07-13 胡小青 Waterproof electric kettle improving safety
CN105762596A (en) * 2013-09-03 2016-07-13 胡小青 Waterproof electric kettle having waterproof cap
CN105640314A (en) * 2013-09-03 2016-06-08 胡小青 Electric kettle with safety cap
CN106788159B (en) * 2016-11-25 2018-10-30 湖南亿福照明科技有限公司 A kind of photovoltaic module and the photoelectric integration intelligent lighting system applied to square

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Also Published As

Publication number Publication date
CN1650484A (en) 2005-08-03
WO2003094307A1 (en) 2003-11-13
GB2388256A (en) 2003-11-05
AU2003222967A1 (en) 2003-11-17
GB0209903D0 (en) 2002-06-05
GB2388256B (en) 2005-10-05

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