A haircare appliance

Abstract

A first aspect of the present invention provides a haircare appliance comprising an airflow generator, a valve assembly comprising an air inlet configured to receive airflow from the airflow generator and a movable member, and an outlet. The movable member is movable, responsive to a force exerted on the movable member by airflow from the air inlet being within a predefined range, to a first position, in which the haircare appliance is in a first operative configuration, and second position, in which the haircare appliance is in a second operative configuration different to the first operative configuration, and wherein the movable member is movable away from the first position and the second position responsive to the force exerted on the movable member by airflow from the air inlet being outside the predefined range. The valve assembly is configured to cause the movable member to move from one of the first position and the second position to the other of the second position and the first position responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to the within the predefined range.

Description

[0001]A HAIRCARE APPLIANCE BACKGROUND Haircare appliances are generally used to treat or style hair, and some haircare appliances may treat or style hair using airflow. To provide versatility in treating and styling hair some haircare appliances provide airflow at a variable flow rate. Some haircare appliances include different attachments to provide different treatment or styling functionality. SUMMARY A first aspect of the present invention provides a haircare appliance comprising an airflow generator, a valve assembly comprising an air inlet configured to receive airflow from the airflow generator and a movable member, and an outlet. The movable member is movable, responsive to a force exerted on the movable member by airflow from the air inlet being within a predefined range, to a first position, in which the haircare appliance is in a first operative configuration, and a second position, in which the haircare appliance is in a second operative configuration different to the first operative configuration, and wherein the movable member is movable away from the first position and the second position responsive to the force exerted on the movable member by airflow from the air inlet being outside the predefined range. The valve assembly is configured to cause the movable member to move from one of the first position and the second position to the other of the second position and the first position responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to the within the predefined range. The valve assembly may allow the haircare appliance to be used in different modes depending on a position of the movable member. A multifunctional haircare appliance may be beneficial to a user in providing different haircare and / or styling performance with the same haircare appliance. The movable member being movable by airflow may provide a more compact, lighter and less expensive haircare appliance compared to a haircare appliance with a drive motor or other additional mechanism to move the movable member. Airflow emitted from the outlet when the movable member is in the first position may have one or more different characteristics to airflow emitted from the outlet when the movable member is the second position. The characteristic may comprise at least one of a shape of the airflow emitted from the air outlet, a velocity of the airflow at the air outlet, and a direction of the airflow at the air outlet. This may allow the haircare appliance to provide different performance depending on the position of the movable member, which may facilitate improved styling performance for different styling operations compared to a haircare appliance without the valve assembly. The air inlet may receive airflow directly or indirectly from the airflow generator. For example, the airflow may pass an airflow heater configured to heat airflow generated by the airflow generator before being received at the air inlet. The force exerted on the movable member by airflow may be changeable in response to a change in air flow rate generated by the airflow generator. This may permit a relatively simple arrangement for moving the movable member between the first and second positions, compared to arrangements requiring additional elements, such as an occlusion, within the haircare appliance to change the force exerted on the movable member by airflow from the air inlet. Moving the force exerted on the movable member by airflow from the air inlet outside of the predefined range and then back into the predefined range may be generated as a result of changes in a flow rate of airflow generated by the airflow generator. For example, the airflow generator may be switched off and then switched on again to move the movable member between the first and second positions. The movable member may be configured to cycle between the first position and the second position in response to successive instances of the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to within the predefined range. A user may thus know which position the movable member will next move to, which may also help a user to know which mode the haircare appliance will switch to, based on a current mode of operation. The movable member may be movable to one or more additional positions when the force exerted on the movable member by airflow from the air inlet is within a predefined range. In each one or more additional position, the haircare appliance may be in a respective additional operative configuration different to each other operative configuration. This may further increase the number of modes in which the haircare appliance may operate. In examples in which the movable member is movable to one or more additional positions, the movable member may be configured to cycle through the available positions in a predetermined sequence. This may permit use of a simple arrangement for moving the movable member and / or a simple control system for causing the movable member to move between positions. The movable member may be movable between the first and second positions responsive to a decrease in the force exerted on the movable member by airflow from the air inlet to below the predefined range, and subsequent increase back to within the predefined range, in the force exerted on the movable member by airflow from the air inlet. This may facilitate rapid switching of the haircare appliance between different modes of operation. The decrease and subsequent increase in the force exerted on the movable member by airflow from the air inlet may be caused by a pulsed reduction in airflow output by the airflow generator. The pulse may have a duration of less than 1 second. The movable member may be movable away from the first position responsive to the force exerted on the movable member by airflow from the air inlet reducing from the predefined range to a first reduction threshold, and movable away from the second position responsive to the force exerted on the movable member by airflow from the air inlet reducing from the predefined range to a second reduction threshold. The movable member may thus remain in the first or second position until the force falls from the predefined range to the respective first or second reduction threshold. This may permit the airflow generator to generate a range of air flow rates above the respective first or second reduction threshold, without the movable member moving away from the first or second position. By reducing the force to move the movable member away from the first and second positions, rather than increasing the force, a hairstyling sequence may not be adversely affected by an airflow change to move the movable away from the first and second positions. In contrast, a sudden increase in airflow, required to increase the force exerted on the movable member to move the movable member away from the first and second positions may affect styling results already achieved. The first and second reduction thresholds may be equal to one another. This may simplify a control system for moving the movable member between the first and second positions. The first and second reduction thresholds may be greater than zero. The movable member may thus be movable away from the first and second positions without the airflow generator being switched off. This may facilitate faster switching between the first and second positions. The first and second reduction thresholds may be 1 N or more. The movable member may thus be movable to the first or second position at a relatively low flow rate. The first and second thresholds may be relative to a percentage of an air flow rate generated by the airflow generator when the haircare appliance is being used in an operational mode with the movable member in the first position or the second position. The first and second thresholds may be relative to a percentage of a maximum air flow rate generatable by the airflow generator in use. The movable member may be movable to the first position responsive to the force exerted on the movable member by airflow from the air inlet increasing from below the predefined range to a first increase threshold, and movable to the second position responsive to the force exerted on the movable member by airflow from the air inlet increasing from below the predefined range to a second increase threshold. The movable member may thus move to the first or second position as the airflow increases towards an air flow rate that is suitable for the mode of operation associated with the respective first or second position. The first and second increase thresholds may be equal to one another. This may simplify a control system for moving the movable member between the first and second positions. The first and second increase thresholds may be lower limits of the predefined range. The movable member may be movable to an intermediate position during movement of the movable member between the first and second positions, responsive to the force exerted on the movable member moving outside of the predefined range, the intermediate position being different to the first position and the second position. This may allow more reliable positioning of the movable member in the first and second positions, by ensuring that the movable member moves to the known intermediate position after moving away from one of the first position and the second position and before moving to the other of the first position and the second position. With the movable member in the intermediate position, airflow may be permitted to pass through at least one of the first air path and second air path. This may help to reduce air pressure within the valve assembly. This may also allow the haircare appliance to operate in a further mode of operation. With the movable member in one of the first position or the second position, the movable member may be configured to move away from the one of the first position or the second position and toward the intermediate position responsive to a reduction in the force exerted on the movable member by airflow from the air inlet to below the predefined range. With the movable member in the intermediate position, the movable member may be configured to move away from the intermediate position and toward either the first position or the second position in response to an increase in the force exerted on the movable member by airflow from the air inlet to within the predefined range. This may provide a simple way of moving the movable member away from the first and second positions and to the intermediate position, and away from the intermediate position and to the first and second positions. By reducing the force to move the movable member away from the first and second positions, compared to increasing the force, a hairstyling operation may not be adversely affected an airflow change to move the movable away from the first and second positions. In contrast, a sudden increase in airflow, required to increase the force exerted on the movable member, may affect styling results already achieved. The valve assembly may comprise a biasing element configured to bias the movable member away from the first position and away from the second position. This may increase a speed at which the movable member is moved away from the first and second positions, which may facilitate rapid switching between the first and second positions. The biasing element may be configured to bias the movable member towards, or to, the intermediate position. The moveable member may thus be configured to remain in the intermediate position when the force exerted on the movable member by airflow from the air inlet is below the predefined range The valve assembly may be configured to cause the movable member to move to the first position responsive to the force exerted on the movable member by airflow from the airflow inlet increasing to within the predefined range after the force exerted on the movable member by airflow from the airflow inlet falls to a minimum threshold. Accordingly, a user of the haircare appliance can ascertain the operational mode of the haircare appliance each time the airflow generator is switched on, irrespective of a position of the movable member before the airflow generator was switched off. In addition, a controller of the haircare appliance is able to determine which position the movable member is in even after multiple switches between the first and second positions because an initial position of the movable member is known. The minimum threshold may be zero. The valve assembly may be configured to cause the movable member move to the intermediate position after the airflow generator is switched on but with the force exerted on the movable member by airflow from the air inlet below the predefined range. The haircare appliance may be configured to cause the movable member move to the first position responsive to the force exerted on the movable member by airflow from the airflow inlet increasing to within the predefined range after the force has been below the predefined range for a predetermined period, irrespective of a position of the movable member before the force fell below the predefined range. Accordingly, a user of the haircare appliance can ascertain the operational mode of the haircare appliance after a period of inactivity, irrespective of a position of the movable member before the force fell below the predefined range. The haircare appliance may be configured to cause the movable member move to the first position responsive to the force exerted on the movable member by airflow from the airflow inlet increasing to within the predefined range after the force has been at or below an idling threshold for a predetermined period, the idling threshold below the predefined range, irrespective of a position of the movable member before the force fell below the idling threshold. The movable member may be in the intermediate position whilst the force is below the predefined range, or at the idling threshold. The movable member may comprise a central axis and be rotatable about the central axis between the first and second positions. This may provide a space-efficient arrangement within the valve assembly. This arrangement may also permit the movable member to be movable between additional positions, for example between the first and second positions, a third position and a fourth position. This may further increase the number of modes of operation of the haircare appliance. The movable member may be movable in a single rotational direction about the central axis. This may simplify a mechanism, for example a cam track and follower, for moving the movable member between the first position and the second position. The valve assembly may define a plurality of first positions and a plurality of second positions alternately disposed about the central axis. The central axis may be substantially parallel to a direction of airflow past the movable member. This may provide a space-efficient arrangement. This may allow permit use of a relatively non-tortuous path between the air inlet and the movable member, compared to a valve assembly in which the central axis is not parallel to a direction of airflow past the movable member. They may increase performance of the haircare appliance. With the haircare appliance in the first operative configuration, air emitted from the haircare appliance may have a first profile, and, with the haircare appliance in the second operative configuration, air emitted from the haircare appliance may have a second profile different to the first profile. Accordingly, movement of the movable member between the first and second positions may alter the profile of air emitted from the haircare attachment, which may increase the functionality of the haircare appliance. For example, when the haircare appliance is in the first operative configuration, the profile may be more focussed compared to when the haircare appliance is in the second operative configuration. The haircare appliance may comprise a housing and a switching element movable relative to the housing, and, with the haircare appliance in the first configuration, the switching element may be at first location relative to the housing, and, with the haircare appliance in the second configuration, the switching element may be at a second location relative to the housing, the first location different to the second location. The location of the switching element may alter a direction of airflow through the haircare appliance. For example, the switching element may comprise one or more baffles, louvres and / or vanes configured to selectively direct airflow through the haircare appliance in different directions. The location of the switching element may alter how the switching element interacts with hair. For example, the switching element may comprise a plurality of moveable protrusions and the housing may comprise a plurality of fixed protrusions, the plurality of moveable protrusions interspaced between the plurality of fixed protrusions. Moving the switching element between the first location and the second location may comprise moving the plurality of movable protrusions with respect to the plurality of fixed protrusions to change a distance between each fixed protrusion and an adjacent movable protrusion. The fixed and moveable protrusions may give the attachment a comb-like appearance. Changing the tension on a user’s hair which is positioned within the attachment may allow for improved styling and user comfort, compared with non-changeable attachments. Changing the tension may also allow for the attachment to be adaptable to different hair types. Changing the distance between adjacent protrusions may provide the change of tension. Further, visible moving of the protrusions may clearly indicate to a user the tension is changing. This may therefore allow a user to actively see the changes, which may be informative (and in some cases reassuring) to a user. The haircare appliance may define a first air path and second air path different to the first air path. With the haircare appliance in the first operative position, airflow may be biased towards the first air path, and, with the haircare appliance in the second operative position, airflow may be biased towards the second air path. Airflow may have different characteristics when emitted from the haircare appliance, depending on whether the airflow has passed along the first air path or the second air path, which may provide a more multifunctional haircare appliance. By defining air paths, more repeatable air profiles may be obtained in use. The airflow may be biased towards the first or second airflow by the movable member, or another movable element of the haircare appliance, when the movable member is in the respective first position or second position. The first and second air flow paths may be defined by the valve assembly, which may allow the valve assembly to be used with different haircare appliance attachments. When the haircare appliance is in the first configuration, the second air path may be occluded, for example by the movable member, and airflow through the first air path may be substantially unimpeded. When the haircare appliance is in the second configuration, the first air path may be occluded, for example by the movable member, and airflow through the second air path may be substantially unimpeded. This may help to increase an amount of airflow along whichever of the first air path and the second air path that is not occluded. The movable member may be deformable, and may deform to move between the first and second positions. This may provide a simple arrangement. The movable member may comprise a flap, the flap rotatable about a pivot axis between the first position and the second position. This may provide a simple arrangement that is relatively simple to manufacture and assemble compared to other mechanisms, for example a cam track and follower. The pivot axis may extend orthogonally to a direction of airflow past the flap. This may provide a space-efficient arrangement. The flap may comprise a first member proximal to the pivot axis, and a second member rotatably connected to an end of the first member that is distal to the pivot axis. The valve assembly may comprise a pair of contact elements configured to move the second member relative to the first member when the flap moves to the first position and the second position. The contact elements may be configured to push the second member in an opposite rotational direction to a rotational direction of the first member as the flap move to the first position or the second position. Accordingly, after moving from the first or second position to the intermediate position, the second member is angled toward the other of the first and second position so that a subsequent increase in force on the flap, specifically on the second member, causes the flap to move to the other of the first and second position. The second member may be rotatable relative to the first member about an axis that is parallel to the pivot axis. The haircare appliance may comprise a lock to lock the movable member in a selected position. Accordingly, the haircare appliance may be operated in a position irrespective of the force exerted on the movable member by airflow from the air inlet, with a user able to manually move and lock the movable member in a desired position. The selected position may be one or more of the first position, the second position and the intermediate position. This may further increase the number of modes in which the haircare appliance is operable. The haircare appliance may comprise a controller configured to control an output of the airflow generator to cause the movable member to move between the first and second positions based on one or more inputs. This may permit selective or automatic movement of the movable member between the first and second positions. For example, the haircare appliance may comprise a user interface, such as a switch or touchscreen, with which a user may request a change in operational mode. For example, the haircare appliance may comprise a sensor configured to output a signal indicative of a hairstyling parameter and the controller may be configured to determine a required position of the movable member based on the signal. The controller may be configured to determine, in based on the one or more inputs, a required position of the movable member and / or whether a change in output of the airflow generator is required. The one or more inputs may be indicative of an instruction for the controller to change the output of the airflow generator to cause the movable member to move between the first and second positions without the controller performing a determination. The haircare appliance may comprise at least one sensor configured to sense one or more of: a detected distance from an air outlet of the haircare appliance from hair being treated by the haircare appliance, a temperature of hair being treated by the haircare appliance, airflow temperature, a user input (e.g. selected style), an amount of time in which the movable member has been in one of the first position and the second position, orientation of the haircare appliance relative to a user, a speed of movement of the haircare appliance relative to hair being treated by the haircare appliance, hair moisture and appliance settings. This may permit automatic movement of the movable member between the first and second positions. For example, the controller may be configured to move the movable member from the first position to the second position based on a signal indicative that hair moisture has fallen below a moisture threshold. At least one of the one or more inputs may be received from a device remote to the haircare appliance, for example wirelessly from a smart device. This may allow a user to control a position of the movable member, for example by selecting a desired airflow profile at the air outlet. The controller may be configured to cause the movable member to move between the first and second positions, or between any of the available positions of the movable member, in a predetermined sequence. Each temporally adjacent position of the movable member in the sequence may cause for the haircare appliance to interact with hair of the user in a different way. The predetermined sequence may result in the haircare appliance performing a predetermined styling routine. The predetermined sequence may be a default mode of operation for the particular attachment attached to the haircare appliance, a default mode of operation for a particular group of settings of the haircare appliance, and / or may be a user-defined mode of operation, such as loaded to the haircare appliance via Bluetooth or other wired or wireless connection. This may provide autonomous and / or intelligent control of the output of the haircare appliance, which may provide improve ease of use and / or improve a treatment of the hair of the user. The haircare appliance may comprise a detector configured to output, to the controller, a position signal indicative of a position of the movable member. This may enable the controller to determine whether a change in air flow rate generated by the airflow generator is required to move the movable member between the first and second positions, or the movable member is already in the required position. The haircare appliance may comprise a main body and an attachment for detachably connecting to the main body, wherein the airflow generator is comprised in the main body. A detachable attachment may increase the number of modes of operation of the haircare appliance. For example, different attachments may be connected to the main body for different hair treatments. The attachment may comprise the controller and / or the detector, which may be configured to communicate with a control system comprised in the main body when the attachment is attached to the main body. The valve assembly may be comprised in the attachment. This then provides a multi- functional attachments. The attachment may comprise an intermediate attachment for detachably connecting to the main body, and a hair treatment attachment for detachably connecting to the intermediate attachment, wherein the intermediate attachment comprises the valve assembly and the hair treatment attachment is configured to receive airflow emitted from the valve assembly, in use. This may provide further multifunctionality with only one valve assembly. The outlet may be comprised in the hair treatment attachment, and may be in fluid communication with an outlet of the intermediate attachment when the hair treatment attachment is attached to the intermediate attachment. A second aspect of the present invention provides an attachment for a haircare appliance, the attachment comprising: a valve assembly comprising an air inlet configured to receive airflow and a movable member; and an outlet. The movable member is movable, responsive to a force exerted on the movable member by airflow from the air inlet being within a predefined range, to a first position, in which the valve assembly is in a first operative configuration, and a second position, in which the valve assembly is in a second operative configuration different to the first operative configuration, and wherein the movable member is movable away from the first position and the second position responsive to the force exerted on the movable member by airflow from the air inlet being outside the predefined range. The valve assembly is configured to cause the movable member to move from one of the first position and the second position to the other of the second position and the first position responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to the within the predefined range.. The valve assembly of the attachment may have any of the features of the valve assembly of the haircare appliance of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a haircare appliance according to an example; Figure 2a is a perspective view of an attachment of the haircare appliance of Figure 1; Figure 2b is an end view of the attachment of Figure 2a; Figure 3 is an exploded view of the attachment of Figure 2a; Figures 4a and 4b are cross-sectional views of the attachment of Figure 2a, the attachment in a first configuration; Figure 4c is a schematic view of a valve assembly of the attachment of Figure 2, the attachment in the first configuration; Figures 5a and 5b are cross-sectional views of the attachment of Figure 2a, the attachment in a second configuration; Figure 5c is a schematic view of a valve assembly of the attachment of Figure 2, the attachment in the second configuration and a third configuration; Figures 6a and 6b are cross-sectional views of the attachment of Figure 2a, the attachment in the third configuration; Figures 7a-d are schematic views of the attachment of Figure 2a, showing airflow through the attachment in the first configuration; Figure 7a is a cross-sectional view of the attachment along the line A-A of Figure 2b, Figure 7b is a cross-sectional view of the attachment along the line B-B of Figure 2b, Figure 7c is a schematic slice view of the attachment, and Figure 7d is a perspective view of the attachment; Figures 8a-d are schematic views of the attachment of Figure 2a, showing airflow through the attachment in the second configuration; Figure 8a is a cross-sectional view of the attachment along the line A-A of Figure 2b, Figure 8b is a cross-sectional view of the attachment along the line B-B of Figure 2b, Figure 8c is a schematic slice view of the attachment, and Figure 8d is a perspective view of the attachment; Figures 9a-d are schematic views of the attachment of Figure 2a, showing airflow through the attachment in the third configuration; Figure 9a is a cross-sectional view of the attachment along the line A-A of Figure 2b, Figure 9b is a cross-sectional view of the attachment along the line B-B of Figure 2b, Figure 9c is a schematic slice view of the attachment, and Figure 9d is a perspective view of the attachment; Figure 10 is a schematic cross-sectional view of another haircare appliance according to an example; Figure 11 is a perspective views of an attachment of the haircare appliance of Figure 10; Figures 12a and 12b are cross-sectional views of the attachment of Figure 11, in a first configuration and a second configuration, respectively; Figure 13 is a perspective view of an attachment for a haircare appliance according to an example; Figure 14 is a perspective view of the attachment of Figure 13; Figures 15a-d are schematic cross-sectional views of the attachment of Figure 13 in different configurations; Figures 16a-c are schematic cross-sectional views of an attachment for a haircare appliance according to an example; Figure 17 is a schematic view of a valve assembly of another attachment according to an example; and Figures 18a-d are schematic views of respective haircare appliances, according to examples. DETAILED DESCRIPTION Figure 1 schematically illustrates a first embodiment of a hair care appliance 10. The hair care appliance 10 comprises a main body 12, and an attachment 14 releasably attachable to the main body 12. The attachment 14 is shown as detached from the main body 12 in Figure 1, for clarity. The main body 12 comprises a handle portion 18, a head portion 20, an airflow generator 22, a heater 24, a user interface 26, and a controller 28. The handle portion 18 is generally cylindrical and hollow in form, and houses the airflow generator 22. The handle portion 18 has an air inlet 38 in the form of a plurality of apertures at a first end 40 of the handle portion 18. The head portion 20 is generally cylindrical and hollow in form, and is disposed at a second end 42 of the handle portion 18, opposite the first end 40. A central axis B of the head portion 20 is orthogonal to a central axis A of the handle portion 18, such that the main body 12 is generally T-shaped in form. The head portion 20 houses the heater 24 and the controller 28. The head portion 20 defines a bore 44 that is coaxial with the central axis B of the head portion 20. The heater 24 and the air outlet 46 are generally annular in form about a periphery of the bore 44. The head portion 20 further comprises one or more magnets (not shown) for releasably connecting the handle unit 12 to the attachment 14. The one or more magnets are positioned around a circumference of the air outlet 46. The user interface 26 is provided on the handle portion 18 and comprises an electronic interface with controls to turn the device on and off, and control one or both of a temperature, and flow rate of the airflow. The controller 28 is responsible for controlling the airflow generator 22 and the heater 24. For example, in response to inputs from the user interface 26, the controller 28 is configured to power on and off the airflow generator 22 and / or the heater 24. Additionally, the controller 28 is configured to control the power or speed of the airflow generator 22 in order to vary the flow rate of the airflow. Similarly, the controller 28 is configured to control the power of the heater 24 in order to vary the temperature of the airflow. The attachment 14 in this example is a concentrator, and will be described in more detail with reference to Figures 1 – 9d. The attachment 14 has a longitudinal axis E. The attachment 14 comprises an annular collar 50, an attachment inlet 52, a neck 54 longitudinally adjacent to the annular collar 50 along the longitudinal axis E and a nozzle 56 attached to an opposite end of the neck 54 to the annular collar 50. To attach the attachment 14 to the main body 12, the annular collar 50 is inserted into the bore 44 at the end of the bore 44 at which the air outlet 46 is located, as denoted by arrow D in Figure 1. When the attachment 14 is attached to the main body 12, the longitudinal axis E of the attachment 14 is coaxial with the central axis B of the head portion 20. When the attachment 14 is attached to the main body 12, the attachment 14 occludes the bore 44 of the head portion 20. The neck 54 comprises a flange 53 that extends radially from the periphery of the annular collar 50, and defines the attachment inlet 52. The attachment inlet 52 comprises a plurality of openings disposed annularly around the periphery of the annular collar 50. With the attachment 14 attached to the main body 12, the attachment inlet 52 is in fluid communication with the air outlet 46 of the head portion 20. The neck 54 has a first neck end 66 adjacent to the annual collar 50 and a second neck end 68 adjacent to the nozzle 56. The neck 54 defines an interior cavity 69 disposed between the first and second neck ends 66, 68. The interior cavity 69 is in fluid communication with the attachment inlet 52 and the nozzle 56. The interior cavity 69 has an internal diameter of around 40mm. An interior of the annular collar 50 is not in fluid communication with the interior cavity 69 of the neck. The second neck end 68 defines four arcuate lobes, generally designated 70, disposed uniformly around the periphery of the second neck end 68, as best shown in Figure 3. Each of the lobes 70 has an equal central angle about the longitudinal axis E to the other lobes 70, which in this example is around 80 degrees. An inner wall 71 of each lobe 70 is arranged at an oblique angle to the longitudinal axis E, with the second neck end 68 having a maximum internal radius adjacent to the nozzle 56 of around 25mm. Adjacent lobes 70 are connected a respective dividing wall 72, which is generally parallel to the longitudinal axis E. Each dividing wall 72 is at a periphery of the interior cavity 69, at a distance from the longitudinal axis E or around 20mm. Each lobe 70 defines a respective neck outlet in fluid communication with the interior cavity 69. A first pair of the lobes 70a are arranged diametrically opposite one another and are in fluid communication with the nozzle inlet 62. A second pair of the lobes 70b are arranged diametrically opposite one another, each at 90 degrees to the first pair of lobes 70a, and each define a peripheral outlet 74 in fluid communication with an exterior of the attachment 14. Each peripheral outlet 74 is in the form of an arcuate slot with a central angle of around 80 degrees. The nozzle 56 has a first nozzle end 58 adjacent to the neck 54 and a second nozzle end 60 opposite the first end 58, and which is distal from the neck 54. The first nozzle end 58 is generally circular and defines a nozzle inlet 62 in fluid communication with the interior cavity 69 of the neck 54. The nozzle inlet 62 has a maximum diameter of around 50mm, in a direction along the line A-A in Figure 2b. The first nozzle end 58 of the nozzle 56 defines a pair of arcuate notches 65 disposed diametrically opposite one another, as best shown in Figure 3, and aligned with a respective one of the peripheral outlets 74. Opposing outer surfaces 63 of the nozzle 65 extend from a respective one of the notches 65 in a direction along the longitudinal axis E, and generally converge towards the second nozzle end 60. The second nozzle end 60 is generally rectangular, in this example obround, and defines a nozzle outlet 64 in the form of a slot. The nozzle outlet 64 centrally intersects the longitudinal axis E of the attachment 14, and extends orthogonally to the longitudinal axis E. A height H1 of the nozzle outlet 64 is less than a diameter of the bore 44 of the head portion 20, and in this example is around 5mm. A length L1 of the nozzle outlet 64 is, in this example, greater than the diameter of the bore 44, and is around 60mm. The attachment 14 comprises a valve assembly comprising a central cylinder 80 (as best shown in Figures 4a-6b) defining a first cam surface 82, a movable member 84, and an upper element 86 defining a second cam surface 88. The central cylinder 80 forms part of the neck 54, is disposed in the interior cavity 69 towards the first neck end 66 of the neck 54, and is coaxial with the longitudinal axis E. The central cylinder 80 has an internal diameter of around 16mm and an external diameter of around 20mm. The central cylinder 80 extends towards the second neck end 68 within the interior cavity 69. A free end 81 of the central cylinder 80 defines the first cam surface 82, which is an undulating annular surface, generally orthogonal to the longitudinal axis E, and having four peaks and four troughs. The four peaks are arranged at 90 degrees to one another. The four troughs are arranged at 90 degrees to one another and each trough is located between two of the four peaks. The upper element 86 comprises a cylindrical element 90 which is coaxial with the longitudinal axis E and the central cylinder 80. The cylindrical element 90 has an internal diameter of around 16mm and an external diameter of around 24mm. A first end 91 of the cylindrical element 90, closest to the central cylinder 80 along the longitudinal axis E, defines the second cam surface 88, which is an undulating annular surface, generally orthogonal to the longitudinal axis E, and having four peaks and four troughs. The four peaks are arranged at 90 degrees to one another. The four troughs are arranged at 90 degrees to one another and intersperse the four peaks. The first and second cam surfaces 82, 88 correspond in shape to one another so that, if placed together, they would mate across substantially all of the first and second cam surfaces 82, 88. The upper element 86 also comprises four attachment arms 92 fixed to an opposite end of the cylindrical element 90 to the second cam surface 88. The attachment arms 92 are disposed at 90 degrees to one another and extend radially outward from the cylindrical element 90. Each attachment arm 92 is elongate and is configured to engage with the second neck end 68 of the neck, at a respective one of the dividing walls 72. The upper element 86 is thus fixed in place relative to the neck 54, and thus the central cylinder 80. As assembled, the central cylinder 80 and the cylindrical element 90 are spaced apart from one another in a direction along the longitudinal axis E such that the first cam surface 82 and the second cam surface 88 define a cam track 93 therebetween. The cam track 93 has a width of around 2.5mm. The movable member 84 comprises a central hub 94, an annular element 96 and four cam follower bars 98. The central hub 94 is generally circular, is coaxial with the longitudinal axis E, and has an outer diameter of around 15.5mm. The central hub 94 is thus receivable within the central cylinder 80 and the cylindrical element 90, which each have an inner diameter of around 16mm. The annular element 96 comprises an outer wall 100 and a radial wall 102. The outer wall 100 has an outer diameter of around 39.5mm and is thus receivable within the interior cavity 69 of the neck 54. The outer wall 100 comprises a pair of openings 104 that are diametrically opposed to one another. The pair of openings 104 each have a central angle of around 80 degrees. The radial wall 102 extends radially inward from the outer wall 100 and towards the first neck end 66 of the neck 54. The radial wall 102 has an inner diameter of around 24.5mm. The cam follower bars 98 are arranged at 90 degrees to one another, and extend radially from the central hub 94 to the outer wall 100 of the annular element 96, through the cam track 93. The cam follower bars 98 are rigid and have a diameter of around 2mm. An annular gap 105 is thus formed between the central hub 94 and the radial wall 102, with the central hub 94 positioned radially within the central cylinder 80 and the cylindrical element 90, and the annular element 96 radially outward of the central cylinder 80 and the cylindrical element 90. The annular gap 105 is of sufficient width to receive the central cylinder 80 and the cylindrical element 90. A spring 106 is located within the central cylinder 80, and is connected at a first end to the first neck end 66 of the neck 54, and at a second, opposite end, to the central hub 94 of the movable member 84. The spring 106 biases the central hub 94 towards the first neck end 66 of the neck 54, and thus biases the cam follower bars 98 towards the troughs of the first cam surface 82. The movable member 84 is movable between initial, first and second positions, relative to the rest of the attachment 14, as will now be described with reference to Figures 4a to 6b. The attachment 14 is shown in cross-section in Figures 4a, 5a and 6a, along the line A-A shown in Figure 2b. The attachment 14 is shown in cross-section in Figures 4b, 5b and 6b, along the line B-B shown in Figure 2b. Figures 4c and 5c are schematic views of the valve assembly, with the annular member 96 omitted for clarity, showing the position of the cam follower bars 98 within the cam track 93 at the initial position, and the first and second positions, respectively. The view is somewhat flattened in order to show three peaks of the first cam surface 82 and three troughs of the second cam surface 88 in a two-dimensional image. Figures 4c and 5c are shown on the same page, to help depict the path of the cam follower bars 98 along the cam track 93 as the movable member 84 is moved between the initial position and the first and second positions. Figures 4a-4c show the movable member 84 in the initial position. In the initial position, the cam follower bars 98 are positioned within the cam track 93 at the troughs of the first cam surface 82, which are adjacent to the peaks of the second cam surface 88. The annular element 96 is positioned within the interior cavity 69 of the neck 54, and does not longitudinally overlap the lobes 70. An annular gap 108 is formed between an outer surface of the central cylinder 80 and the radial wall 102 of the movable member 84. The spring 106 biases the movable member to the first position. Figures 5a-5c show the movable member 84 in the first position. In the first position, the cam follower bars 98 are positioned within the cam track 93 at the troughs of the second cam surface 88, which are adjacent to the peaks of the first cam surface 82. The annular element 96 is positioned within the interior cavity 69 of the neck 54, but is further from the first neck end 66 than when the movable member 84 is in the initial position. Accordingly, the annular element 96 longitudinally overlaps the lobes 70. In the first position, the radial wall 102 of the movable member 84 is very close to, or in contact with, the cylindrical element 90 of the upper element 86 such that there is substantially no annular gap between the radial wall 102 and the cylindrical element 90. The pair of openings 104 of the annular element 96 are aligned with the first pair of lobes 70a so that the first pair of lobes 70a are in fluid communication with the interior cavity 69 of the neck 54, as best shown in Figure 5a. Portions of the outer wall 100 that do not comprise the pair of openings 104 are aligned with the second pair of lobes 70b and block the second pair of lobes 70b, as best shown in Figure 5b, such that fluid communication between the interior cavity 69 and the second pair of lobes 70b is inhibited. Figures 5c, 6a and 6b show the movable member 84 in the second position. In the second position, the cam follower bars 98 are positioned within the cam track 93 at the troughs of the second cam surface 88, which are adjacent to the peaks of the first cam surface 82. The annular element 96 is positioned within the interior cavity 69 of the neck 54, but is further from the first neck end 66 than when the movable member 84 is in the initial position. Accordingly, the annular element 96 longitudinally overlaps the lobes 70. In the second position, the radial wall 102 of the movable member 84 is very close to, or in contact with, the cylindrical element 90 of the upper element 86 such that there is substantially no annular gap between the radial wall 102 and the cylindrical element 90. The pair of openings 104 of the annular element 96 are aligned with the second pair of lobes 70 so that the second pair of lobes are in fluid communication with the interior cavity 69 of the neck 54, as best shown in Figure 6b. Portions of the outer wall 100 that do not comprise the pair of openings 104 are aligned with the first pair of lobes 70a and block the first pair of lobes 70a, as best shown in Figure 6a, such that fluid communication between the interior cavity 69 and the first pair of lobes 70a is inhibited. Use of the haircare appliance 10 will now be described with reference to Figures 7a to 9d. When the haircare appliance 10 is not in use, the movable member 84 is biased to the initial position by the spring 106. In use of the haircare appliance 10, with the attachment 14 attached to the head portion 20, operation of the airflow generator 22 draws air into the handle unit 18 via the apertures forming the inlet 38. Airflow is subsequently emitted from the main body 12 via the air outlet 46. An air flow rate generated by the airflow generator 22 is controlled by the controller 28. The heater 24 is controlled by the controller 28 to selectively heat the airflow before it is emitted from the air outlet 46. Upon entering the attachment 14, the airflow passes through the interior cavity 66 of the neck 54 and is subsequently emitted from one or more of the nozzle outlet 64 or the pair of peripheral outlets 68, depending on a position of the movable element 84. When airflow enters the attachment 14 below a threshold flow rate, in this example 10 L / s, the movable member 84 is in the initial position, biased there by the spring 106 because a force exerted on the movable member 84 is not sufficient to overcome a biasing force exerted on the movable member 84 by the spring 106. The attachment in use in the initial position is depicted in Figures 7a-7d. Figure 7c is a schematic slice view of the second neck end 68 of the neck 54. Airflow passes through the attachment 14 as shown by the arrows in Figures 7a-7d. More particularly, the airflow passes through the annular gap 108 between the outer surface of the central cylinder 80 and the radial wall 102 of the movable member 84. The airflow then passes through each of the lobes 70. Airflow that passes through the first pair of lobes 70a passes into the nozzle 56 via the nozzle inlet 62 and is emitted from the attachment 14 via the nozzle outlet 64. Airflow is emitted from the nozzle outlet 64 in a direction substantially parallel to the longitudinal axis E. Airflow that passes through the second pair of lobes 70b is emitted from the attachment 14 via the peripheral outlets 74. Airflow emitted from the peripheral outlets 74 generally passes across the respective outer surface 73 of the nozzle 56 in a direction towards the nozzle outlet 64. When airflow enters the attachment 14 at or above the threshold flow rate, the force exerted on the movable member 84 by the spring 106 is overcome by the force exerted on the movable member 84 by the airflow. The cam follower bars 98 are thus moved along the cam track 93 towards the peaks of the first cam surface 82, as shown by the arrows in Figure 4c, causing the movable member 84 to move longitudinally along, and to rotate about, the longitudinal axis E. The movable member 84 moves to the first or second position that is rotationally adjacent to the initial position that the movable member 84 was in immediately before the attachment 14 reached the threshold flow rate. The movable member 84 always rotates about the longitudinal axis E in the same direction. The attachment in use in the first position is depicted in Figures 8a-8d. Figure 8c is a schematic slice view of the second neck end 68 of the neck 54. When the movable member 84 is moved to the first position, airflow passes through the attachment 14 as shown by the arrows in Figures 8a-8d. More particularly, the airflow passes through the pair of openings 104 in the annular element 96 and passes through the first pair of lobes 70a. The airflow then passes into the nozzle 56 via the nozzle inlet 62 and is emitted from the attachment 14 via the nozzle outlet 64. Airflow is emitted from the nozzle outlet 64 in a direction substantially parallel to the longitudinal axis E, at a higher flow rate than airflow emitted from the nozzle outlet 64 when the movable member 84 is in the first position. Airflow is inhibited from passing through the second pair of lobes 70b, and thus from being emitted from the peripheral outlets 74, by the outer wall 100 of the annular element 96. The attachment in use in the second position is depicted in Figures 9a-9d. Figure 9c is a schematic slice view of the second neck end 68 of the neck 54. When the movable member 84 is moved to the second position, airflow passes through the attachment 14 as shown by the arrows in Figures 9a-9d. More particularly, the airflow passes through the pair of openings 104 in the annular element 96, passes through the second pair of lobes 70b, and is emitted from the attachment 14 via the peripheral outlets 74. Airflow is inhibited from passing through the first pair of lobes 70a, and thus from passing through the nozzle 56, by the outer wall 100 of the annular element 96. Airflow emitted from the peripheral outlets 74 generally passes across the respective outer surface 73 of the nozzle 56 in a direction towards the nozzle outlet 64, at a higher flow rate than airflow emitted from the peripheral outlets 74 when the movable member 84 is in the first position. Different airflow profiles are thus emitted from the attachment 14 depending on the position of the movable member 84 relative to the remainder of the attachment 14. Together, the movable member 84 and the cam track 93 form a valve for selectively emitting airflow from the nozzle outlet 64 and / or the peripheral outlets 74. The attachment 14 comprises a detector 110, in this example a flow detector, disposed at the nozzle outlet 64, as shown in Figure 3. The detector 110 is communicatively coupled to the controller 28 and outputs a signal to the controller 28 that is indicative of which position the movable member 84 is in, based on the flow rate at the nozzle outlet 64. It will be appreciated that any other suitable type of detector may, additionally or alternatively, be employed to indicate a position of the movable member 84 to the controller 28. With the air flow rate at or above the threshold flow rate, and thus the movable member 84 in one of the first or second positions, a reduction in air flow rate below the threshold flow rate causes the movable member 84 to move to the initial position that is rotationally adjacent to the first or second position that the movable member 84 was in, as shown by the arrows in Figure 5c. A subsequent increase in the flow rate to, or above, the threshold flow rate, causes the movable member 84 to move to the first or second position that is rotationally adjacent to the initial position that the movable member 84 was in. Accordingly, the air profile emitted from the attachment 14 can be changed by a brief, temporary reduction in air flow rate. Due to the shape of the cam track 93, the movable member 84 is cyclable between the first and second positions in response to successive reductions in the flow rate below the threshold flow rate. In moving from one of the first or second positions to the rotationally adjacent first or second position, via an intermediate initial position, the movable member 84 is rotated by 90 degrees about the longitudinal axis E so that the openings 104 align with either the first pair of lobes 70a or the second pair of lobes 70b. The controller 28 is configured to control the airflow generator 22 to change the position of the movable member 84 in response to one or more inputs. In this example, the controller 28 is configured to cause the movable member 84 to change position in response to the user actuating the user interface 26. In some examples, the controller 28 receives an input wirelessly from an external device, for example a smart phone of the user. In some examples, the haircare appliance 10 comprises one or more sensors (not shown) to sense a characteristic of hair being styled by the haircare appliance 10, and the controller 28 is configured to cause the movable member 84 to move to one of the initial, first or second positions based on signals received from the one or more sensors. In some examples, the controller 28 is configured to cause the haircare appliance 10 to operate with the movable member 84 in the first position for a predetermined period of time, and, after the predetermined period of time has elapsed, to control the airflow generator 22 to cause the movable member 84 to move to the second position. The predetermined period of time is determined based on user inputs, for example, hair type, hair length and desired hair style and / or signals received from one or more sensors of the haircare appliance. Figure 10 schematically illustrates a second attachment 214 for use with the main body 12. The attachment 214 in this example is a diffuser bowl, and will be described in more detail with reference to Figures 10-13. The attachment 214 is shown in perspective view in Figure 11. The attachment 214 comprises an annular collar 250, a neck 253, a hair treatment bowl 254, a first set of manifolds 256, and a second set of manifolds 258. In this example, there are three manifolds in the first set of manifolds 256, distributed uniformly around a periphery of the hair treatment bowl 254, and three manifolds in the second set of manifolds 258. The manifolds in the second set of manifolds 258 are distributed uniformly around the periphery of the hair treatment bowl 254 are alternately arranged with the first set of manifolds 256. The neck 253 is disposed between the annular collar 250 and the hair treatment bowl 254. The neck 253 is generally cylindrical and hollow in form, and comprises an annular air inlet 252 around a periphery of the neck 253. To attach the attachment 214 to the main body 12, the annular collar 250 is inserted into the bore 44 at the end of the bore 44 at which the air outlet 46 is located, as shown in Figure 10. The attachment has a longitudinal axis F which, when the attachment is attached to the main body 12, is coaxial with the central axis B of the head portion 20. When the attachment 214 is attached to the main body 12, the attachment 214 occludes the bore 44 of the head portion 20, and the attachment inlet 252 is in fluid communication with the air outlet 46. The attachment inlet 252 is in fluid communication with the hollow interior 269 of the neck 253. An interior of the annular collar 250 is not in fluid communication with the hollow interior 269 of the neck. A valve arrangement 260 is located within the hollow interior 269 of the neck 253. The valve arrangement 260 is rotatable within the neck 253 to direct airflow through either the first set of manifolds 256 or the second set of manifolds 258, as will be discussed in more detail hereafter. A magnetic strip (not shown) extends annularly about the annular air inlet 252. The first set of manifolds 256 extend away from the annular collar 250 toward an annular connecting portion 264. Each manifold of the first set of manifolds 256 is substantially hollow in form, and is open at an end distal from annular collar 250. The open end of each of the first set of manifolds 256 opens into the connecting portion 264, which is capped by an annular rim 266. The connecting portion 264 is in the form of an annular channel extending around a periphery of the hair treatment bowl 254. The annular rim 266 depends from an outer edge of the connecting portion 264 and extends radially inward. An annular outlet 268 is defined by a gap between an inner edge of the annular rim 266 and an inner edge of the connecting portion 264, as best shown in Figures 12a and 12b. The hair treatment bowl 254 is concave in form, and comprises a wall 270 with a plurality of apertures 272 formed therein. The wall 270 depends from the inner edge of the connecting portion 264, and the annular outlet 268 provides an opening that fluidly connects the first set of manifolds 256 to the hair treatment bowl 254. The second set of manifolds 258 extend away from the annular collar 250 toward the connecting portion 264, but have a height shorter than a corresponding height of the first set of manifolds 256, such that the second set of manifolds 258 do not reach the annular connecting portion 264. Each manifold of the second set of manifolds 258 is hollow in form, and comprises a plurality of apertures 274 that are directed toward the wall 270 of the hair treatment bowl 254, as best shown in Figures 12a and 12b. The valve arrangement 260 is movable between an initial position, a first position and a second position. The valve arrangement 260 is substantially the same as the arrangement described with reference to the haircare appliance 10, having a movable member 276 movable along a cam track (not shown) to move the valve arrangement 260 between the initial, first and second positions. In this example, the movable member has three openings 278 disposed in an outer wall 280 of the movable member 276. The openings 278 are disposed evenly around the outer wall 280 and each have a central angle of around 50 degrees. In the initial position, the movable member 276 is within the neck 253, as best shown in Figure 10, so that the three openings 278 lie against a peripheral wall of the neck 253. In the first position, the three openings 278 are each aligned with a respective one of the three manifolds of the first set of manifolds 256, and the outer wall 280 occludes an inlet end 259 of each of the three manifolds of the second set of manifolds 258. The inlet end 259 is adjacent to the neck 253. Accordingly, only the first set of manifolds 256 are in fluid communication with the hollow interior 266 of the neck 253. In the second position, the three openings 278 are each aligned with a respective one of the three manifolds of the second set of manifolds 258, and the outer wall 280 occludes an inlet end 257 of each of the three manifolds of the first set of manifolds 256. The inlet end 257 is adjacent to the neck 253. Accordingly, only the second set of manifolds 258 are in fluid communication with the hollow interior 266 of the neck 253. The movable member 276 is rotatable about the central axis F by around 60 degrees to move from one of the first or second positions to an adjacent first or second position. During operation of the hair care appliance with the attachment 214 attached to the main body 12, the user’s hair is placed in the hair treatment bowl 264, and the airflow generator 22 generates an airflow through the main body 12 and into the attachment 214. The valve arrangement 260 is operable in much the same way as the valve assembly of the attachment 14 described with reference to Figures 1 to 9d. The valve arrangement 260 is biased to the initial position. The movable member 278 is thus in the initial position when the airflow generator 22 is switched off or generating airflow at a rate below a minimum flow rate. Upon the flow rate reaching the minimum flow rate, a force exerted on the movable member 278 by the airflow causes the movable member 278 to move to the first position. A reduction in flow rate below the minimum flow rate causes the movable member 278 to move back to the initial position, and a subsequent increase in the flow rate to the minimum flow rate causes the movable member 278 to move to the second position. Such reductions and subsequent increases in the flow rate, in sequence, cause the movable member 278 to cycle between the first and second positions. Control of the flow rate is by the controller 28 to move the movable member 278 between the initial, first and second positions. With the movable member 278 in the first position, airflow is directed into the first set of manifolds 256, and enters the hair treatment bowl 254 via the air outlet. The shape of the annular rim 266 directs the airflow into the bowl, towards the neck 2530. The airflow exits the hair treatment bowl 254 via the apertures 272 in the wall 270 of the hair treatment bowl 254. With the movable member 278 in the second position, airflow is directed into the second set of manifolds 258, and enters the hair treatment bowl 254 via the apertures in the ends of manifolds of the second set of manifolds and via the apertures 272 in the wall 270 of the hair treatment bowl 254. The airflow enters the hair treatment bowl 254 in a direction away from the neck 253. Thus, airflow exits the hair treatment bowl 254 in opposing directions when the movable member 278 is in the first and second positions. The attachment 214 comprises locking pins 290 disposed in the neck 253 at a periphery of the hollow interior 269 of the neck 253. The locking pins 290 are movable between a retracted position, in which the locking pins 290 do no inhibit movement of the movable member 278 between the initial position and the first and second positions, and an extended position, in which the locking pins 290 inhibit movement of the movable member from the first or second position to the initial position. The locking pins 290 are controllable by the controller 28 to selectively move between the retracted and extended position. In the extended position, the locking pins 290 lock the movable member 278 in whichever of the first or second position that the movable member 278 was in when the locking pins were moved to the extended position. When in the extended position, the locking pins 290 prevent the movable member 278 from moving longitudinally within the neck 253. Accordingly, a drop in airflow below the minimum flow rate does not cause the movable member 278 to change position. Although not shown in the example of Figures 1 to 9b, the attachment 14 may also comprise a lock, for example locking pins as described above, to lock the movable member 78 in one of the first or second positions. Figures 13 and 14 show perspective views of another attachment 314 for attaching to the main body 12. The attachment 314 is a concentrator, and will be described in more detail with reference to Figures 13 to 15d. The attachment 314 has a longitudinal axis G. The attachment 314 comprises an annular collar 350, an attachment inlet 352, a neck 354 longitudinally adjacent to the annular collar 350 along the longitudinal axis G, a nozzle 356 attached to an opposite end of the neck 354 to the annular collar 350 and a valve assembly 400. To attach the attachment 314 to the main body 12, the annular collar 350 is inserted into the bore 44 at the end of the bore 44 at which the air outlet 46 is located. When the attachment 314 is attached to the main body 12, the longitudinal axis G of the attachment 314 is coaxial with the central axis B of the head portion 20. The neck 354 comprises a flange 353 that extends radially from the periphery of the annular collar 350, and defines the attachment inlet 352. The attachment inlet 352 is a generally annular opening around the periphery of the annular collar 350. With the attachment 314 attached to the main body 12, the attachment inlet 352 is in fluid communication with the air outlet 46 of the head portion 20. The neck 354 has a first neck end 366 adjacent to the annual collar 350 and a second neck end 368 adjacent to the nozzle 356. The neck 354 defines an interior cavity 369 disposed between the first and second neck ends 366, 368. The interior cavity 369 is in fluid communication with the attachment inlet 352 and the nozzle 356. First and second ridges 361a, 361b are diametrically disposed at a periphery of the interior cavity 369. Each ridge 361a, 361b comprises a face that is obliquely angled towards the annular collar 350. The nozzle 356 has a first nozzle end 358 adjacent to the neck 354 and a second nozzle end 360 opposite the first end 358, and which is distal from the neck 354. The first nozzle end 358 is generally circular. The second nozzle end 360 is generally rectangular, or obround, and defines a nozzle outlet 364 in the form of a slot. The nozzle outlet 364 centrally intersects the longitudinal axis G of the attachment 314, and extends orthogonally to the longitudinal axis G. The nozzle 356 is generally hollow. The hollow interior is in fluid communication with the interior cavity 369 of the neck 354, and the hollow interior of the nozzle 356 is bisected by a central wall 365. The central wall 365 bisects the nozzle outlet 364, has a width that extends across a length of the slot, and a length that extends between the first and second ends 358, 360 of the nozzle 356. Accordingly, the nozzle 356 defines a first air channel 366a and a second air channel 366b, on opposing sides of the central wall 365. The valve assembly 400 is best shown in Figures 15a-d, which are schematic cross- sectional slices of the attachment 314. The valve assembly 400 comprises a movable member 402 in the form of an articulated flap, and a spring (not shown) that acts to rotate the movable member 402 about the first pivot joint 408. The movable member 402 comprises a first arm 404, a second arm 406, a first pivot joint 408, and a second pivot joint 410. at a junction between the first arm 404 and the second arm 406. The first pivot joint 408 pivotably connects a first end of the first arm 404 to an end of the central wall 365 that is closest to the first end 358 of the nozzle 356. The second pivot joint 410 pivotably connects a second end of the first arm 404, the second end opposite the first end, a first end of the second arm 406. A second end of the second arm 406, opposite the first end, is free. The movable member 402 extends generally in a direction away from the nozzle 356. The second pivot joint 410 is bistable, and retains the second arm 406 relative to the first arm 404 at either a first angle A1, as shown in Figures 15a and 15d, or a second angle A2, as shown in Figures 15b and 15c. In this example, the first angle is around 120 degrees and the second angle is around 240 degrees. The second pivot joint 410 inhibits an angle between the first and second arms 404, 406 from decreasing below the first angle A1 and from increasing above the second angle A2. The spring biases the movable member 402 to an initial position, as shown by the arrows H in Figures 15b and 15d, in which the movable member 410 in the initial position is shown in solid lines. In the initial position, the first arm 404 is generally parallel to the longitudinal axis G, and the second arm 406 is at either the first or second angle A1, A2 relative to the first arm 406. The movable member 402 is movable from the initial position to a first position and a second position, as shown in Figures 15b and 15d, respectively. In the first position, the movable member 402 is rotated relative to the central wall 365 such that the free end of the second arm 406 contacts the first ridge 361a at the periphery of the interior cavity 369. The second arm 406 is parallel to the oblique face of the first ridge 361a, and is at the second angle relative to the first arm 404. In the first position, the movable member 402 substantially blocks the first channel 366a. Accordingly, with the movable member 402 in the first position, there is substantially no fluid communication between the interior cavity 369 and the first channel 366a. In the second position, the movable member 402 is rotated relative to the central wall 365 such that the free end of the second arm 406 contacts the second ridge 361b at the periphery of the interior cavity 369. The second arm 406 is parallel to the oblique face of the second ridge 361b, and is at the first angle relative to the first arm 404. In the second position, the movable member 402 substantially blocks the second channel 366b. Accordingly, with the movable member 402 in the second position, there is substantially no fluid communication between the interior cavity 369 and the second channel 366b. With reference to Figures 15a-15d, operation of the valve assembly 400 will now be described. In this example, prior to use of the valve assembly, the movable member 402 is biased to the initial position by the spring, as shown in Figure 15a. The second arm 406 is at the first angle A1 relative to the first arm 404 but, as will be described herein, in other examples could be at the second angle A2 relative to the first arm 404. In use of the attachment 314, with the attachment 314 attached to a haircare appliance 12, 212, airflow enters the attachment 314 via the attachment inlet 352 and flows through the interior cavity 369 of the neck 354 in a direction parallel to the longitudinal axis G. The airflow exerts a force on the second arm 406 of the movable member 402. The second arm 406 is at the first angle A1 relative to the first arm 404, and is thus inclined towards the first ridge 261a. Since the second pivot joint 410 inhibits the angle between the first and second arms 404, 406 from decreasing below the first angle A1, if the force exerted by the airflow exceeds the biasing force of the spring, the movable member 402 is caused to rotate about the first pivot joint 408. The rotation of the movable member 402 causes the free end of the second arm 406 to contact the oblique face of the first ridge 361a. The first ridge 361a exerts sufficient force on the second arm 406 to cause the second pivot joint 410 to move to the other of the bistable positions, so that the second arm 406 is moved to the second angle A2 relative to the first arm 404. The movable member 402 is thus moved to the first position, as denoted by the movable member 402 shown in dashed lines in Figure 15a. If the force exerted by the airflow does not exceed the biasing force of the spring, the movable member 402 remains in the initial position, and airflow passes into both the first and second channels 366a, 366b. Use of the attachment 314 with the movable member 402 in the first position in shown in Figure 15b. The movable member 402 occludes the first channel 366a so that air is directed along the second channel 366b before being emitted from the attachment 314 via the nozzle outlet 364. When airflow through the attachment 314 reduces to a flow rate such that force exerted on the movable member 402 by the airflow falls below the biasing force of the spring, the movable member 402 is caused to move from the first position back to the initial position. However, in the initial position, the second arm 404 is now at the second angle A2 relative to the first arm 406, as shown in Figure 15c. A subsequent increase in air flow rate such that force exerted by the airflow again exceeds the biasing force of the spring causes the movable member 402 to rotate about the first pivot joint 408. Because the second arm 406 is at the second angle A2 relative to the first arm 404, the movable member 402 rotates in the opposite direction about the first pivot joint 408 compared to when the movable member 402 is in the initial position with the second arm 406 is at the first angle A1 relative to the first arm 404. The rotation of the movable member 402 causes the free end of the second arm 406 to contact the oblique face of the second ridge 361b. The second ridge 361b exerts sufficient force on the second arm 406 to cause the second pivot joint 410 to move to the other of the bistable positions, so that the second arm 406 is moved to the first angle A1 relative to the first arm 404. The movable member 402 is thus moved to the second position, as denoted by the movable member 402 shown in dashed lines in Figure 15c. Use of the attachment 314 with the movable member 402 in the second position in shown in Figure 15d. The movable member 402 occludes the second channel 366b so that air is directed along the first channel 366a before being emitted from the attachment 314 via the nozzle outlet 364. Accordingly, the airflow travels through the attachment 314 along different flow paths depending on the position of the movable member 402. Whether the second arm 406 is at the first or second angle A1, A2 relative to the first arm 406 in the initial position depends on which of the first and second position the movable member 402 was in immediately prior to the movable member 402 being in the initial position. In use, the movable member 402 cycles between the first and second positions is response to sequential reductions and subsequent increases in the flow rate entering the attachment 314. Figures 16a-c schematically illustrates a fourth attachment 414 for use with the main body 12. The attachment 414 has a longitudinal axis H. The attachment 414 comprises an annular collar (not shown), an attachment inlet (not shown), a neck 454 longitudinally adjacent to the annular collar along the longitudinal axis H and a pair of baffles 456 attached to an opposite end of the neck 454 to the annular collar and defining an attachment outlet 464 therebetween. The attachment 414 is attached to the main body 12 with the annular collar in the same manner as the attachment 14 described with reference to Figures 1-9d, and will not be described again for brevity. The neck 454 defines an interior cavity 469 in fluid communication with the attachment inlet and the attachment outlet 464. The attachment 414 comprises a valve assembly 416, as shown schematically in Figure 17, disposed in the interior cavity 469 of the neck 454. The valve assembly 416 is connected to the pair of baffles 456 by a connector 458. The valve assembly 416 comprises a first cylinder 480 and a second cylinder 486, each having an identical diameter and arranged adjacent to one another long the longitudinal axis of the valve assembly 416. The longitudinal axis extends in the direction denoted by the arrow J in Figure 17 and is coaxial with the longitudinal axis H of the attachment 414. The first and second cylinders 480, 486 are fixed within the interior cavity 469 and are not movable relative to the neck 454. In Figure 17, the valve assembly 416 is shown in a schematic flattened view, in three dimensions, the two dashed lines would meet. The first cylinder 480 defines a first cam surface 482 facing towards the second cylinder 486. The first cam surface 482 defines a pair of troughs and a pair of peaks arranged alternately with one another. The pair of peaks are of equal geometry to one another and are diametrically opposed to one another around the first cylinder 480. The second cylinder 486 defines a second cam surface 488 facing towards the first cylinder 480. The second cam surface 482 defines four troughs and four peaks arranged alternately with one another. Each of the peaks are of equal geometry to one another, and are uniformly distributed around the second cylinder 486 at 90 degrees to one another. The peaks of the second cam surface 488 longitudinally overlap the peaks of the first cam surface 482. A cam track 493 is defined between the first and second cam surfaces 482, 488. The valve assembly 416 also comprises two dividers 489 disposed in the cam track 493 between adjacent peaks of the first cam surface 482, and separated from the first and second cam surfaces 482, 488. Each divider 489 has a first divider end 489a that longitudinally overlaps with the peaks of the first cam surface 482, and a second divider end 489b that longitudinally overlaps the peaks of the second cam surface 488. The first divider end 489a is to a first side of a respective peak of the second cam surface 482, and the second divider end 489b is to a second side of the respective peak of the second cam surface 482. The valve assembly 416 comprises a cam follower bar 498, which is disposed in the cam track 493. In this example, the cam follower bar 498 is a linear rod that orthogonally intersects the longitudinal axis J of the valve assembly 416 of the first and second cylinders 480, 486 and extends from one side of the cam track 493 to the other. The cam follower bar 498 is movable within the cam track 493 between initial, intermediate, first and second positions. The cam follower bar 498 is fixed to the connector 458, and the connector 458 is configured such that movement of the cam follower bar 498 between the initial, intermediate, first and second positions results in movement of the baffles 456 relative to the neck 454. The connector 458 is configured such that, when the cam follower bar 498 is in the initial position or the intermediate position, the baffles 456 are positioned parallel to one another and extend in a direction parallel to the longitudinal axis H of the attachment 414, as shown in Figure 16a. The attachment outlet 464 thus has a width that is generally the same as a diameter of the neck 454. The connector 458 is configured such that, when the cam follower bar 498 is in the first position, the baffles 456 are inclined towards one another, as shown in Figure 16b. The attachment outlet 464 thus has a width that is smaller than the diameter of the neck 454, and smaller than a width of the attachment outlet 464 when the cam follower bar 498 is in the initial or intermediate position. Therefore, airflow emitted from the attachment in use with the cam follower bar 498 in the first position is more focussed than when the cam follower bar 498 is in the initial or intermediate position. The connector 458 is configured such that, when the cam follower bar 498 is in the second position, the baffles 456 are inclined away from one another, as shown in Figure 16c. The attachment outlet 464 thus has a width that is larger than the diameter of the neck 454, and larger than a width of the attachment outlet 464 when the cam follower bar 498 is in the first, initial or intermediate position. Therefore, airflow emitted from the attachment in use with the cam follower bar 498 in the second position is more diffused than when the cam follower bar 498 is in the first, initial or intermediate position. When the attachment 414 is not in use, the cam follower bar 498 is biased to the initial position by a biaser (not shown). In the initial position, the cam follower bar 498 is seated in the troughs of the first cam surface 482. The initial position is denoted L in Figure 17. In use of the attachment 414, a position of the cam follower bar 498 is dependent on a force exerted on the cam follower bar 498 by airflow generated by the airflow generator 22. Movement of the cam follower bar 498 along the track 493 is denoted by the dashed arrows in Figure 17 and will be described in more detail hereinafter. Upon turning on the airflow generator, if the airflow remains below an idle flow rate, in this example 4 L / s, the cam follower bar 498 remains in the initial position L because the force exerted on the cam follower bar 498 by the airflow is insufficient to overcome the biaser. Upon turning on the airflow generator, if the airflow increases to or above the idle flow rate, but remains below an operational flow rate, in this example 10 L / s, the cam follower bar 498 is moved from the initial position to a first intermediate position. In the first intermediate position, the cam follower bar 498 is adjacent to the second divider ends 489b and is longitudinally between the troughs of the first cam surface 482 and the troughs of the second cam surface 488. The first intermediate position is denoted M in Figure 17. In either of these scenarios, the baffles 456 remain in the position shown in Figure 16a. Upon turning on the airflow generator, if the airflow increases to or exceeds the operational flow rate, the cam follower bar 498 is moved from the initial position to the first position, via the intermediate position. In the first position, the cam follower bar 498 is seated in a diametrically opposed pair of the troughs of the second cam surface 488. The first position is denoted in Figure 17. In this scenario, the baffles 456 are caused to move to the position shown in Figure 16b. In moving from the initial position to the first position, the cam follower bar 498 passes around the second divider ends 489b of the dividers 489 and rotates within the cam track 493 so that the cam follower bar 498 rotationally overlaps the second ends 489b of the dividers 489. The shape of the first cam surface 482, the position of the troughs of the first cam surface 482 relative to the troughs of the second cam surface 488, and the presence of the dividers 489 ensures that, regardless of whether the cam follower bar 498 was in the first position or the second position immediately before the airflow generator was switched off, the cam follower bar 498 is always returned to the first position when the airflow increase to the operational flow rate upon turning on the airflow generator. With the cam follower bar 498 in the first position, a subsequent decrease in airflow from above the operational flow rate to the idle flow rate causes the cam follower bar 498 to move away from the first position to a second intermediate position. In the second intermediate position, the cam follower bar 498 is adjacent to the first divider ends 489a and is longitudinally between the troughs of the first cam surface 482 and the troughs of the second cam surface 488. The second intermediate position is denoted P in Figure 17. In moving from the first position to the second intermediate position, the cam follower bar 498 is moved under force exerted by the biaser in a direction parallel to the longitudinal axis J of the valve assembly 416 towards the first cylinder 480. As the flow rate falls to the idle flow rate, the cam follower member 498 contacts the second ends 489b of the dividers 489 and then slides along the dividers 489 to the first ends 489a of the dividers 489. Sliding along the dividers 489 causes the cam follower bar 498 to rotate within the cam track 493 so that the cam follower bar 498 rotationally passes a peak of the second cam surface 488. In this scenario, the baffles 456 are caused to move back to the position shown in Figure 16a. With the cam follower bar 498 in the second intermediate position, a subsequent increase in airflow from the idle flow rate to the operational flow rate causes the cam follower bar 498 to move from the second intermediate position to the second position. In the second position, the cam follower bar 498 is seated in a different diametrically opposed pair of the troughs of the second cam surface 488 to the pair of troughs that the cam follower bar 498 is seated in in the first position. The second position is denoted Q in Figure 17. In moving from the second intermediate position to the second position, the cam follower 498 is moved in a direction parallel to the longitudinal axis J of the valve assembly 416 away from the first cylinder 480. As the flow rate increases to the operational flow rate, the cam follower member 498 contacts the second cam surface 488 and then slides towards the respective pair of troughs of the second cam surface 488. Sliding along the second cam surface 488 causes the cam follower bar 498 to rotate within the cam track 493 so that the cam follower bar 498 rotationally passes a peak of the first cam surface 482. In this scenario, the baffles 456 are caused to move to the position shown in Figure 16c. With the cam follower bar 498 in the second position, a subsequent decrease in airflow from above the operational flow rate to the idle flow rate causes the cam follower bar 498 to move away from the second position to the first intermediate position. In moving from the second position to the first intermediate position, the cam follower bar 498 is moved under force exerted by the biaser in a direction parallel to the longitudinal axis J of the valve assembly 416 towards the first cylinder 480. As the flow rate falls to the idle flow rate, the cam follower member 498 contacts the first cam surface 482 and then slides towards the pair of troughs of the first cam surface 482. Such sliding along the first cam surface 482 causes the cam follower bar 498 to rotate within the cam track 493 so that the cam follower bar 498 rotationally passes a peak of the second cam surface 488. In this scenario, the baffles 456 are caused to move back to the position shown in Figure 16a. With the cam follower bar 498 in any of the first intermediate position, the second intermediate position, the first position or the second position, a decrease in airflow below the idle flow rate causes the cam follower bar 498 to return to the initial position. Since the first cam surface 482 comprises a pair of troughs diametrically opposed to one another, the initial position is the same even if the cam follower bar 498 is rotated by 180 degrees about the longitudinal axis J of the valve assembly 416. Accordingly, the cam follower bar 498 is caused to cycle between the first and second positions by fluctuations in airflow between the idle flow rate and the operational flow rate, and is always returned to the first position after airflow through the attachment has been below the idle flow rate. In examples, a haircare appliance comprising the attachment 414 is configured to return the cam follower bar 498 to the first position after airflow through the cam follower bar 498 has been in the intermediate position M,P for a predetermined period of time. In one example, the controller 28 of the main body 12 is programmed to cause the cam follower member 498 to return to the first position if the flow rate has been at the idle flow rate for a predetermined period of time, in this example 3 seconds. Upon causing the flow rate to increase to or above the operational flow rate after the predetermined period has elapsed with the flow rate at the idle flow rate, the controller determines whether the cam follower member 498 is in the first position, based on a signal from a sensor (not shown) of the attachment 414, and if the controller determines that the cam follower member 498 is not in the first position, the controller automatically causes the flow rate to pulse down to the idle flow rate and back up to or above the operational flow rate to return the cam follower bar 498 to the first position. In another example, if the cam follower bar 498 was in the first position immediately before the predetermined period, upon receipt of an instruction to cause the flow rate to increase to or above the operational flow rate after the predetermined period has elapsed with the flow rate at the idle flow rate, the controller 28 causes the airflow to reduce to below the idle flow rate and then causes the airflow to increase to or above the operational flow rate. A fifth attachment according to an example is identical to the attachment described with reference to Figures 16a-17, except that the another attachment is configured such that, in the first position, the baffles are non-parallel with the longitudinal axis and are angled to direct air in a first direction away from the longitudinal axis, and in the second position, the baffles are non-parallel with the longitudinal axis and are angled to direct air in a second direction away from the longitudinal axis, the second direction different to the first direction. In an example, in the first position, the baffles are angled at 30 degrees from the longitudinal axis, and in the second position, the baffles are angled at -30 degrees from the longitudinal axis. Accordingly, air is emitted from the another attachment in different directions depending on the position of the valve assembly. In some examples, the baffles are parallel with one another in the initial, intermediate, first and second positions. Figures 18a-d show various schematic arrangements of haircare appliances according to examples. Each haircare appliance comprises a main body, an attachment, and a valve assembly. The valve assembly may be any valve assembly falling within the scope of the application, and thus is movable between different positions in response to changes in airflow through the attachment, for example a valve assembly accordingly to one of the examples described herein with reference to Figures 1 to 17. In the example haircare appliance 510 of Figure 18a, the valve assembly 560 is comprised in the main body 512, and the attachment 514 is removably attachable to the main body 512. In the example of Figure 18b, the valve assembly 660 is comprised in the attachment 614, and the attachment 614 is removably attachable to the main body 612. In the example of Figure 18c, the attachment 712 and valve assembly 760 are comprised in the main body 712. That is, the attachment 712 cannot be detached from the main body 712. In the example of Figure 18d, the attachment 814 comprises an intermediate attachment 816, removably attachable to the main body 812, and a distal attachment 818, removably attachable to the intermediate attachment 816. The valve assembly 860 is comprised in the intermediate attachment 816. It will be appreciated that, whilst the described example valve assemblies are movable between the first and second positions in response to a reduction and subsequent increase in force exerted on the movable member by airflow, other example valve assemblies may be movable between the first and second positions in response to an increase and subsequent reduction in force exerted on the movable member by airflow. It will be appreciated that valve assemblies according to examples may be actuated to change the air profile emitted from the attachment, in use, without the need for a drive system to actuate the valve assembly. It will be appreciated that the valve assemblies described herein may be used with any suitable type of attachment, and are not limited to use in the types of attachment described herein.

Claims

CLAIMS 1. A haircare appliance comprising: an airflow generator; a valve assembly comprising an air inlet configured to receive airflow from the airflow generator and a movable member; and an outlet, wherein: the movable member is movable, responsive to a force exerted on the movable member by airflow from the air inlet being within a predefined range, to a first position, in which the haircare appliance is in a first operative configuration, and a second position, in which the haircare appliance is in a second operative configuration different to the first operative configuration, the movable member is movable away from the first position and the second position responsive to the force exerted on the movable member by airflow from the air inlet being outside the predefined range, and the valve assembly is configured to cause the movable member to move from one of the first position and the second position to the other of the second position and the first position responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to the within the predefined range.

2. A haircare appliance according to claim 1, wherein the movable member is configured to cycle between the first position and the second position in response to successive instances of the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to within the predefined range.

3. A haircare appliance according to claim 1 or claim 2, wherein the movable member is movable between the first and second positions responsive to a decrease in the force exerted on the movable member by airflow from the air inlet to below the predefinedrange, and subsequent increase in the force exerted on the movable member by airflow from the air inlet back to within the predefined range.

4. A haircare appliance according to any one of the preceding claims, wherein the movable member is movable to an intermediate position during movement of the movable member between the first and second positions, responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range, the intermediate position being different to the first position and the second position.

5. A haircare appliance according to claim 4, wherein, with the movable member in one of the first position or the second position, the movable member is configured to move away from the one of the first position or the second position and toward the intermediate position responsive to a reduction in the force exerted on the movable member by airflow from the air inlet to below the predefined range, and with the movable member in the intermediate position, the movable member is configured to move away from the intermediate position and toward either the first position or the second position in response to an increase in the force exerted on the movable member by airflow from the air inlet to within the predefined range.

6. A haircare appliance according to any one of preceding claims, wherein the valve assembly is configured to cause the movable member to move to the first position responsive to the force exerted on the movable member by airflow from the airflow inlet increasing to within the predefined range after the force exerted on the movable member by airflow falls to a minimum threshold.

7. A haircare appliance according to any one of preceding claim, wherein the haircare appliance is configured to cause the movable member to move to the first position responsive to the force exerted on the movable member by airflow from the airflow inlet increasing to within the predefined range after the force has been below the predefined range for a predetermined period, irrespective of a position of the movable member before the force fell below the predefined range.

8. A haircare appliance according to any one of the preceding claims, wherein the movable member comprises a central axis and is rotatable about the central axis between the first and second positions.

9. A haircare appliance according to any one of the preceding claims, wherein, with the haircare appliance in the first operative configuration, air emitted from the haircare appliance has a first profile, and, with the haircare appliance in the second operative configuration, air emitted from the haircare appliance has a second profile different to the first profile.

10. A haircare appliance according to any one of the preceding claims, comprising a housing and a switching element movable relative to the housing, wherein, with the haircare appliance in the first configuration, the switching element is at first location relative to the housing, and, with the haircare appliance in the second configuration, the switching element is at a second location relative to the housing, the first location different to the second location.

11. A haircare appliance according to any one of the preceding claims, wherein the haircare appliance defines a first air path and second air path different to the first air path, wherein, with the haircare appliance in the first operative position, airflow is biased towards the first air path, and, with the haircare appliance in the second operative position, airflow is biased towards the second air path.

12. A haircare appliance according to any one of the preceding claims, wherein the movable member comprises a flap, the flap rotatable about a pivot axis between the first position and the second position.

13. A haircare appliance according to any one of the preceding claims, comprising a lock to lock the movable member in a selected position.

14. A haircare appliance according to any one of the preceding claims, wherein the force exerted on the movable member by airflow is changeable in response to a change in air flow rate generated by the airflow generator.

15. A haircare appliance according to claim 14, comprising a controller configured to control an output of the airflow generator to cause the movable member to move between the first and second positions based on one or more inputs.

16. A haircare appliance according to claim 15, comprising a detector configured to output, to the controller, a position signal indicative of a position of the movable member.

17. A haircare appliance according to any one of the preceding claims, comprising a main body and an attachment for detachably connecting to the main body, wherein the airflow generator is comprised in the main body.

18. A haircare appliance according to claim 17, wherein the valve assembly is comprised in the attachment.

19. A haircare appliance according to claim 18, wherein the attachment comprises: an intermediate attachment for detachably connecting to the main body, and a hair treatment attachment for detachably connecting to the intermediate attachment, wherein the intermediate attachment comprises the valve assembly and the hair treatment attachment is configured to receive airflow emitted from the valve assembly, in use.

20. An attachment for a haircare appliance, the attachment comprising: a valve assembly comprising an air inlet configured to receive airflow and a movable member; and an outlet, wherein:the movable member is movable, responsive to a force exerted on the movable member by airflow from the air inlet being within a predefined range, to a first position, in which the valve assembly is in a first operative configuration, and a second position, in which the valve assembly is in a second operative configuration different to the first operative configuration, the movable member is movable away from the first position and the second position responsive to the force exerted on the movable member by airflow from the air inlet being outside the predefined range, and the valve assembly is configured to cause the movable member to move from one of the first position and the second position to the other of the second position and the first position responsive to the force exerted on the movable member by airflow from the air inlet moving outside of the predefined range and subsequently returning to the within the predefined range.

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