Patent Publication Number: US-2023148725-A1

Title: Hair care appliance

Description:
RELATED APPLICATION 
     This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application No. 63/279,041, filed Nov. 12, 2021, entitled “Hair Care Appliance,” the entire contents of which are hereby expressly incorporated by reference herein. 
    
    
     BACKGROUND 
     Hair care appliances are devices used for drying and styling of hair. Hair care appliances can include a variety of components operable to provide a fluid flow via a fluid flow path extending through the device. The fluid flow path receives ambient air and directs the ambient air through the hair care appliance via a motor and fan assembly. The fluid flow path is directed across a heating assembly to generate heated air at an outlet of the hair care appliance. Air is expelled from the hair care appliance via the fluid flow path to enable a user to dry or style hair. One or more attachments are often used with the hair care appliance depending on the user&#39;s hair styling or treatment needs. 
     SUMMARY 
     In another aspect, a hair care appliance is provided and can include a housing having a handle and a body. The housing can have a fluid inlet, a fluid outlet, and a fluid flow path extending there through between the fluid inlet and the fluid outlet. The hair care appliance can include a heater assembly disposed in the housing along the fluid flow path and configured to heat fluid flowing through the fluid flow path. The heater assembly can include an inner support structure comprising a central shaft and a plurality of planar segments extending along and radially outward from the central shaft. Each planar segment of the plurality of planar segments can be spaced circumferentially from one another. The heater assembly can also include at least one wire element extending circumferentially around the inner support structure such that the inner support structure supports the at least one wire element. Each of the plurality of planar segments can include a cut-out formed therein and configured to allow fluid flow there through. 
     In another embodiment, the heater assembly can also include a thermistor having first and second connecting wires that can be mounted to at least one of the plurality of planar segments to suspend the thermistor in the fluid flow path at the fluid outlet. The first and second wires together can form a u-shaped configuration. In another embodiment, the thermistor can be suspended between two adjacent planar segments of the plurality of segments via the first and second wires. The heater assembly can also include a fuse coupled to one of the two adjacent planar segments. 
     In another embodiment, the hair care appliance can include a rotational hinge joint between the handle and the body. Wiring powering the heater assembly can be routed along a periphery of the rotational hinge joint and along an inner surface of the handle and the body. In another embodiment, the cut-outs formed in each of the plurality of planar segments can have a shape selected from the group consisting of a rectangular shape, a square shape, a circular shape, a geometric shape, and an ellipsoid shape. In another embodiment, the heater assembly also includes an ionizer coupled to at least one planar segment of the plurality of planar segments. In another embodiment, the heater assembly also includes a cylindrical housing enclosing the inner support structure and the at least one wire element. 
     In another aspect, a hair care appliance is provided and can include a housing comprising a handle having a first end with a fluid inlet formed therein and a second end, and a body having a first end coupled to the second end of the handle and a second end with a fluid outlet formed therein. The hair care appliance can include a fluid pathway extending through the housing between the fluid inlet in the handle and the fluid outlet in the body. The hair care appliance can also include a fan assembly disposed in the housing along the fluid pathway for directing fluid from the fluid inlet to the fluid outlet. The hair care appliance can also include a heater assembly disposed in the housing along the fluid pathway for heating fluid flowing through the fluid pathway. The hair care appliance can further include a user interface surface extending along a portion of the handle and including at least one button for controlling at least one of the fan assembly and the heater assembly. The user interface surface can extend from the first end of the handle toward the second end. 
     In another embodiment, the fluid inlet can extend at least partially around a circumference of the handle at the first end of the handle, and the user interface surface intersects the fluid inlet. In another embodiment, the at least one button can be flush or sub-flush within respect to the user interface surface. In another embodiment, the user interface surface can include an elongate region having opposite edges extending longitudinally along the handle to facilitate gripping of the handle. In another embodiment, the fluid inlet can include a substantially C-shaped cylindrical porous outer housing and a filter disposed therein. In another embodiment, the user interface can intersect the substantially C-shaped cylindrical porous outer housing and the filter. In another embodiment, the user interface can be located in a scalloped portion of the handle. In another embodiment, the user interface can include at least one illumination element illuminating the at least one button or a surface of the user interface. In another embodiment, the hair care appliance can also include a blow-out button for shutting off the heater assembly to cause non-heated fluid to flow through the fluid pathway. In another embodiment, the at least one button controlling the fan assembly can be repeatedly engaged to select at least one velocity setting of the fan assembly. In another embodiment, the at least one button controlling the heater assembly can be repeatedly engaged to select at least one temperature setting of the heater assembly. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       These and other features will be more readily understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a side cross-sectional view of one exemplary embodiment of a hair care appliance shown in a straight configuration; 
         FIG.  2    is a side cross-sectional view of the hair care appliance of  FIG.  1    shown in an angled or bent configuration; 
         FIG.  3    is a perspective end view of a handle of the hair care appliance of  FIG.  1   ; 
         FIG.  4    is a perspective view of the handle of  FIG.  1    shown with the inlet housing removed; 
         FIG.  5    is a side perspective view of the hair care appliance of  FIG.  1    with the inlet housing and filter removed; 
         FIG.  6    is another side perspective side of the hair care appliance of  FIG.  1    with the inlet housing and filter removed; 
         FIG.  7    is a top side perspective view of the hair care appliance of  FIG.  1    with the outer housings removed to show internal components of the appliance; 
         FIG.  8    is a bottom side perspective view of the hair care appliance shown in  FIG.  7   ; 
         FIG.  9    is a side perspective view of the hair care appliance shown in  FIG.  7   , showing a rotational hinge joint; 
         FIG.  10    is a side perspective exploded view of a handle hinge portion, a retainer, and a gasket included in the rotational hinge joint of  FIG.  9   ; 
         FIG.  11    is a side perspective view of a partially assembled configuration of the rotational hinge joint of  FIG.  10   ; 
         FIG.  12    is a side perspective view of the partially assembled configuration of the rotational hinge joint of  FIG.  11    further including a handle hinge plate mated thereto; 
         FIG.  13    is a side perspective view of the partially assembled configuration of the rotational hinge joint of  FIG.  12    further including a body hinge plate mated thereto; 
         FIG.  14    is a side perspective view of the partially assembled configuration of the rotational hinge joint of  FIG.  13    further including a first body frame mated thereto; 
         FIG.  15    is a side perspective view of the partially assembled configuration of the rotational hinge joint of  FIG.  14    further including a heater assembly and wiring mated thereto; 
         FIG.  16    is a side perspective of the partially assembled configuration of the rotational hinge joint of  FIG.  15    further including a second body frame mounted thereto; 
         FIG.  17    is a side perspective view of an outlet of the partially assembled configuration of the rotational hinge joint of  FIG.  16    further including an O-ring mated thereto; 
         FIG.  18    is a side view of the hair care appliance of  FIG.  1    showing a ratio of handle and body dimensions; 
         FIG.  19    is a side view of the hair care appliance of  FIG.  1    showing a center of mass and a tapered handle shape of the hair care appliance; 
         FIG.  20    is a perspective end view of a user interface of the hair care appliance of  FIG.  1   ; 
         FIG.  21    is a cross-sectional perspective view of the hair care appliance of  FIG.  1    with the handle housings removed to show internal electrical components; 
         FIG.  22    is a side perspective view of a bottom portion of the electrical components shown in  FIG.  21   ; 
         FIG.  23    is another side perspective view of the electrical components of  FIG.  21   ; 
         FIG.  24    is a side perspective view of the hair care appliance of  FIG.  1    with the handle and body housings removed to shown an internal fan assembly; 
         FIG.  25    is a side cross-sectional view of the hair care appliance of  FIG.  24   ; 
         FIG.  26    is a side perspective view of a portion of the hair care appliance of  FIG.  1    with the outer housings removed to show an internal heater assembly; 
         FIG.  27    is a cross-sectional view of the hair care appliance shown in  FIG.  26   ; 
         FIG.  28    is a perspective end view of the heater assembly of  FIG.  26   . 
         FIG.  29    is a side perspective view of the hair care appliance of  FIG.  1    with the outer housings removed and showing a flow path in a straight configuration; 
         FIG.  30    is a another side perspective view of the hair care appliance of  FIG.  1    with the outer housings removed and showing the fluid flow path; 
         FIG.  31    is a plot illustrating flow path testing data for the hair care appliance of  FIG.  1    in a straight configuration; 
         FIG.  32    is a plot illustrating flow path testing data for the hair care appliance of  FIG.  1    in an angled configuration; 
         FIG.  33    is a perspective side view of the hair care appliance of  FIG.  1    showing an attachment mating assembly on an end thereof; 
         FIG.  34    is a another side perspective view showing the mating mechanism of  FIG.  33   ; 
         FIG.  35 A  is an end perspective view of the attachment mating assembly of  FIG.  33   ; 
         FIG.  35 B  is an end perspective of another embodiment of an attachment mating assembly of the hair care appliance; 
         FIG.  36    is a cross-sectional perspective view of the attachment mating assembly of  FIG.  35   ; 
         FIG.  37    is a cross-sectional side view of the attachment matching assembly of  FIG.  35   ; 
         FIG.  38    is a perspective view of an exemplary embodiment of a round brush attachment configured for use with a hair care appliance; 
         FIG.  39    is a cross-sectional view of the round brush attachment of  FIG.  38   ; 
         FIG.  40    is a cross-sectional view of the attachment mating assembly of the round brush attachment of  FIG.  38   ; 
         FIG.  41    is a top perspective view of a latching and release mechanism of the round brush attachment of  FIG.  38   ; 
         FIG.  42    is a bottom perspective view of engagement features of the round brush attachment of  FIG.  38   ; 
         FIG.  43    is a perspective view of an exemplary embodiment of a curling attachment configured for use with a hair appliance; 
         FIG.  44    is a cross-sectional view of a fluid flow through the curling attachment of  FIG.  43   ; 
         FIG.  45    is a perspective view of another exemplary embodiment of a curling attachment configured for use with a hair care appliance; 
         FIG.  46    is a perspective view of another exemplary embodiment of a curling attachment configured for use with a hair care appliance; 
         FIG.  47    is a top view of the curling attachment of  FIG.  46   ; 
         FIG.  48    is a side view of the curling attachment of  FIG.  46   ; 
         FIG.  49    is a perspective view of the curling attachment of  FIG.  46    in operation; 
         FIG.  50    is a perspective view of an exemplary embodiment of a barrel curling attachment configured for use with a hair care appliance; 
         FIG.  51    is a cross-sectional end view of a scroll assembly of the barrel curling attachment of  FIG.  50    in operation; 
         FIG.  52    is another cross-sectional end view of the scroll assembly of the barrel curling attachment of  FIG.  50    in operation; 
         FIG.  53    is a cross-sectional view of an exemplary embodiment of a wrapping barrel curling attachment configured for use with a hair care appliance; 
         FIG.  54    is a side view of the wrapping barrel curling attachment of  FIG.  53   ; 
         FIG.  55    is a perspective view of another exemplary embodiment of a round brush attachment configured for use with a hair care appliance; 
         FIG.  56 A  is a cross-sectional view of the round brush attachment of  FIG.  55    in neutral configuration; 
         FIG.  56 B  is a cross-sectional view of the round brush attachment of  FIG.  55    when used in a first direction; 
         FIG.  56 C  is a cross-sectional view of the round brush attachment of  FIG.  55    when used in a second direction; 
         FIG.  57    is a top perspective top view of an alignment feature of the round brush attachment of  FIG.  55   ; 
         FIG.  58    is a side perspective view of an exemplary embodiment of a diffuser attachment configured for use with a hair care appliance; 
         FIG.  59    is a bottom perspective view of the diffuser attachment of  FIG.  58   ; 
         FIG.  60    is a cross-sectional view of the diffuser attachment of  FIG.  58    showing a disc therein; 
         FIG.  61    is a cross-sectional view of the diffuser attachment of  FIG.  58    showing a fluid flow path there through; 
         FIG.  62    is a side view of an exemplary embodiment of a concentrator attachment configured for use with a hair care appliance; 
         FIG.  63    is a stop side perspective view of another exemplary embodiment of a concentrator attachment configured for use with a hair care appliance; 
         FIG.  64    is a bottom side perspective view of the concentrator attachment of  FIG.  63   ; 
         FIG.  65    is a side perspective view of another exemplary embodiment of a concentrator attachment configured for use with a hair care appliance; 
         FIG.  66    is a perspective view of another exemplary embodiment of a curling attachment configured for use with a hair care appliance; 
         FIG.  67    is a side perspective view of an exemplary embodiment of a paddle brush attachment configured for use with a hair care appliance; 
         FIG.  68    is a perspective view of an electromagnetic compatibility (EMC) enclosure configured for use with the hair care appliance described herein; 
         FIG.  69    is a front perspective view of contents of the EMC enclosure of  FIG.  68     
         FIG.  70    is a rear perspective view of the contents of the EMC enclosure of  FIG.  68   ; 
         FIG.  71    is a perspective view of an ionizer arranged with the heater assembly of the hair care appliance described herein; 
         FIG.  72    is a side perspective view of another exemplary embodiment of an attachment mating assembly of a hair care appliance; 
         FIG.  73    is a perspective view of an attachment mating collar of the attachment mating assembly of  FIG.  72   ; 
         FIG.  74    is a side perspective view of an attachment actuator assembly and the attachment mating collar of the attachment mating assembly of  FIG.  72   ; 
         FIG.  75    is a side perspective view of the attachment actuator assembly of the attachment mating assembly of  FIG.  72   ; 
         FIG.  76 A  is a cross-sectional view of the attachment actuator assembly coupled with the attachment mating collar of  FIG.  73   ; 
         FIG.  76 B  is a cut-away cross-sectional view of the attachment actuator assembly coupled with attachment mating collar of  FIG.  73   ; 
         FIG.  77    is an end perspective view of an outlet grill of the attachment mating assembly of  FIG.  72   ; 
         FIG.  78    is a top perspective view of another exemplary embodiment of a diffuser attachment configured for use with the attachment mating assembly of  FIG.  72   ; 
         FIG.  79    is a bottom perspective view of the diffuser attachment of  FIG.  78   ; 
         FIG.  80    is a cross-sectional top perspective view of the diffuser attachment of  FIG.  78     
         FIG.  81    is a cross-sectional view of the diffuser attachment of  FIG.  78   ; 
         FIG.  82 A  is a side view of another exemplary embodiment of a concentrator attachment configured for use with a hair care appliance including the attachment mating assembly of  FIG.  72   ; 
         FIG.  82 B  is a bottom view of the concentrator attachment of  FIG.  82 A ; 
         FIG.  82 C  is a side perspective view of the concentrator attachment of  FIG.  82 A ; 
         FIG.  83 A  is a perspective view of another exemplary embodiment of a curling attachment configured for use with a hair care appliance including the attachment mating assembly of  FIG.  72   ; 
         FIG.  83 B  is a cross-sectional view of the curling attachment of  FIG.  83 A ; 
         FIG.  84 A  is a perspective view of another exemplary embodiment of a round brush attachment configured for use with a hair care appliance including the attachment mating assembly of  FIG.  72   ; 
         FIG.  84 B  is a cross-sectional perspective view of the round brush attachment of  FIG.  84 A ; 
         FIG.  85 A  is a perspective view of another exemplary embodiment of a paddle brush attachment configured for use with a hair care appliance including the attachment mating assembly of  FIG.  72   ; 
         FIG.  85 B  is a cross-sectional perspective view of the paddle brush attachment of  FIG.  84 A ; 
         FIG.  86    is a perspective view of an exemplary embodiment of an air dividing structure of the paddle brush of  FIG.  85 A ; 
         FIG.  87 A  is side view of a hair care appliance showing an experimental approach for determining a center of gravity of the hair care appliance described herein in a straight configuration; 
         FIG.  87 B  is a side view of the hair care appliance of  FIG.  87 A  showing a location of the center of gravity of the hair care appliance described herein in the straight configuration; 
         FIG.  88 A  is a side view of a hair care appliance showing an experimental approach for determining a center of gravity of the hair care appliance described herein in a bent configuration; 
         FIG.  88 B  is a side view of the hair care appliance of  FIG.  88 A  showing a location of the center of gravity of the hair care appliance described herein in the bent configuration; 
         FIG.  89 A  is a cross-sectional view of a hair care appliance showing a location of a printed circuit board of the hair care appliance in the straight configuration; 
         FIG.  89 B  is a cross-sectional view of a hair care appliance showing a location of a motor of the hair care appliance in the straight configuration; 
         FIG.  89 C  is a cross-sectional view of a hair care appliance showing a location of a heater of the hair care appliance in the straight configuration; and 
         FIG.  90    is a partially transparent view of a hair care appliance showing a location of the heater of the hair care appliance in the bent configuration. 
     
    
    
     It is noted that the drawings are not necessarily to scale. The drawings are intended to depict only typical aspects of the subject matter disclosed herein, and therefore should not be considered as limiting the scope of the disclosure. 
     DETAILED DESCRIPTION 
     Certain exemplary embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the devices and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention. 
     Various exemplary hair care appliances and accessories for use with a hair care appliance are provided herein. In general, the hair care appliance is in the form of a hair dryer that has an elongate generally cylindrical configuration with a handle and a body that are movably coupled to one another. The handle is configured to move relative to the body to transition the appliance from a straight configuration to a bent configuration, thus allowing a user to select a desired configured based on an intended use. The hair care appliance also includes various internal components that facilitate use and operation of the hair care appliance. Various accessories are also provided for use with the hair care appliance, and the configuration of the appliance can be varied based on the type of accessory mated to the hair care appliance. In certain embodiments, the accessory can limit a configuration of the hair care appliance. For example, at least one accessory is provided that mates to the hair dryer in the straight configuration, and prevents movement of the hair care appliance to the bent configuration. Other accessories, on the other hand, can mate in a manner that enables use of the hair dryer in a selected configuration. In some embodiments, the accessories can be attached the hair care appliance in permanently fixed positions. In other aspects, a hair care appliance is provided that lacks a rotational hinge joint. In such embodiments, one hair care appliance can be provided having a straight configuration, and a second hair care appliance can be provided having an angled configuration. The accessories described herein can be used with any of the aforementioned hair care appliances, or with any other hair care appliance known in the art. 
       FIGS.  1  and  2    illustrate one exemplary embodiment of a hair care appliance  100  shown in a straight configuration and a bent configuration, respectively. As shown, the hair care appliance  100  generally includes a handle  110  movably coupled to a body  120  by a rotational hinge joint  300 . In the straight configuration, shown in  FIG.  1   , the appliance  100  has a generally elongate cylindrical shape. The handle  110  has an inlet  112  at a first end of the appliance  100  and the body has an outlet  122  at a second end of the appliance. A fluid flow path P shown as a dashed line is formed between the inlet  112  and the outlet  122 . The rotational hinge joint  300  formed between the handle  110  and the body  120  can articulate via user operation to alter the configuration of the hair care appliance  100  and the fluid flow path P from the straight configuration to the bent or angled configuration. As shown in  FIG.  2   , the handle  110  and the body  120  are angled relative to one another as a result of articulation of the rotational hinge joint  300 . As a result, the fluid flow path P shown by a dashed line is angled between the handle  110  and the body  120 . 
     A person skilled in the art will appreciate that the hair care appliance  100  can be operated while the rotational hinge joint  300  is unlatched, and/or while the rotational hinge joint  300  is rotated to any position that is between the position of the rotational hinge joint  300  in the straight configuration and the angled configuration. In other aspects, the hair care appliance  100  and the rotational hinge joint  300  can be configured to prevent over-rotation of the rotational hinge joint  300  beyond its position in the angled configuration. The hair care appliance  100  can be configured in a fully straight configuration, as shown in  FIG.  1   , in which the rotational hinge joint locks the body so as to be longitudinally aligned with the handle. The hair care appliance  100  can be configured in a fully bent configuration, as shown in  FIG.  2   , in which the rotational hinge joint locks the body at an angle relative to the handle. The hair care appliance  100  can also be configured in a rotated configuration in which the rotational hinge joint positions the body relative to the handle in a range of angled positions that are in between those of the fully straight configuration and the fully bent configuration. 
     The handle  110  can include various internal electrical components  400  for operating the appliance. In general, the handle can include electrical components  400  that can control operation of a fan assembly  500  disposed within the handle  110  and a heater assembly  600  disposed in the body  120 . In an exemplary embodiment, as shown, the fan assembly  500  can be placed downstream of the rotational hinge joint  300  and in proximity of the heater assembly  600 , which is disposed upstream of the rotational hinge joint  300 . This can help improve fluid flow within the hair care appliance  100 . The fan assembly  500  can generate a fluid flow along the fluid flow path P such that air is drawn into the inlet  112 , passes through the handle  110 , and into the body  120  to be exhausted via the outlet  122 . As the air passes through the body  120 , the air can be heated via the heater assembly  600 . 
     The electrical components  400  can be configured to couple to a power supply  410 .  FIG.  3    illustrates a power supply cord  130  extending from a base of the handle  110 . The power supply cord  130  can have a terminal end (not shown) configured to couple to a power source, e.g., the terminal end can be configured to plug into an electrical outlet. The power supply cord  130  can include internal electrical wiring for delivering power to the electronics in the handle  110 . The power supply cord  130  may be connected to an electronics housing containing at least one controller or PCB. As further shown in  FIG.  3   , the handle  110  can include a scalloped portion  403  where the user interface  401  can be located. 
     As further shown in  FIG.  3   , the end of the handle  110  can include a filter assembly  200  for filtering air drawn in through the inlet  112 . In the illustrated embodiment, the filter extends around the proximal end portion of the handle  110 , but is not formed in the end wall of the handle  110 . Thus, fluid D is drawn in circumferentially around the sidewalls of the handle  110 . The illustrated filter assembly  200  includes an inlet housing  220  that is generally C-shaped and that is flexible for allowing the inlet housing  220  to be removed for cleaning. A user interface  401  can intersect the inlet housing  220 . The inlet housing  220  has a plurality of holes through which the fluid can flow into the fluid flow path. The holes can have any configuration and can be arranged in any pattern. The inlet housing  220  can cover a filter  230  positioned behind the inlet housing, as shown in  FIG.  4    in which the inlet housing  220  is removed. The filter  230  can be a porous element configured to block debris and hair that may have entered the inlet housing  220 , thus preventing debris from entering the fluid flow path P. As further shown in  FIG.  4   , the electrical components  400  can be positioned just downstream of the filter, but upstream of the fan assembly  500 , thus the fluid flow path P flows over and around the electrical components  400  as the fluid is drawn toward and into the fan assembly  500  in operation. This can aid in cooling the electrical components  400 . 
     Appliance Housings 
     The remainder of the handle  110  is formed from a first handle housing  114   a  and a second handle housing  114   b  which mate together in a clam-shell type configuration to enclose the internal components. In some embodiments, the handle  110  can include a single handle housing such as a sleeve. The first and second handle housings  114   a ,  114   b  can be snap fit together, although other attachment mechanisms are envisioned. The inlet housing  220  can be snap fit with the first housing handle  114   a  and the second handle housing  114   b . The hair care appliance  100  also includes a body housing  124 . In some embodiments, the body  120  can be formed from multiple housings that mate to one another. 
     The handle housings  114   a ,  114   b  and the body housing  124  can include a surface treatment configured to aid a user in gripping the hair care appliance  100  and/or rotating the rotational hinge joint  300  to change the configuration of the hair care appliance  100  from the straight configuration to the bent configuration, or vice versa. In some embodiments, as shown in  FIG.  5   , the surface treatment can include fluting, such as spiral-shaped fluting, on the body housing  124 . In some embodiments, the surface treatment can include a painted or similarly applied surface treatment. 
     The appliance can also include a number of internal housings or frames. As shown in  FIG.  7   , in which the external housings  114   a ,  114   b ,  124  are removed, the hair care appliance  100  includes a first handle frame  116   a  and a second handle frame  116   b  configured within the handle  110 . The first and second handle frames  116   a ,  116   b  can be mated to another via snap-fit or similar attachment methods or mechanisms such as friction fitting, screws, or rivets. The hair care appliance  100  can also include a first body frame  126   a  and a second body frame  126   b  disposed within the body  120 . The first and second body frames  126   a ,  126   b  can be mated to another via snap-fit or similar attachment methods or mechanisms such as friction fitting, screws, or rivets. 
     A fan assembly cover  502  can be arranged within the handle  110  and can be mounted to the second handle frame  116   b . In some embodiments, the first handle frame  116   a  can extend to form a fan assembly cover, rather than having a separate cover. The electrical components  420  can be arranged between the first handle frame  116   a  and the second handle frame  116   b . The electrical components  400  can be coupled to either of the first handle frame  116   a , the second handle frame  116   b , of both of the first and second handle frames  116   a ,  116   b . As shown in  FIG.  8   , the second handle frame  116   b  can be arranged along the bottom of the hair care appliance  100 . 
     Hinge Joint 
     As indicated above, the body  120  and handle  110  are mated to one another at the rotational hinge joint  300 . The rotational hinge joint  300  can have a variety of configurations, but in the illustrated embodiment, as shown in  FIG.  9   , it includes a handle hinge plate  302  configured with respect to the handle  110  and a body hinge plate  306  configured with respect to the body  120 . The handle and body hinge plates  302 ,  306  can be separated by a gap so that the handle  110  and body  120  can rotate with respect to one another in a smooth, unimpeded manner. In some embodiments, the handle and body hinge plates  302 ,  306  can include a surface finish or applied material. In some embodiments, the rotational hinge joint  300  can be configured at an angle between 30 to 50 degrees relative to the longitudinal axis of the handle. The rotational hinge joint  300  can be rotated to the angled configuration in a first direction and rotated in a second direction to return to the straight configuration. 
     The rotational hinge joint  300  is shown in more detail in  FIGS.  10 - 17   . As shown, the hinge joint  300  is formed between the second handle frame  116   b  of the handle, shown in part in  FIGS.  10 - 17   , and the first body frame  126   a . In other embodiments, the rotational hinge joint  300  can be a separately formed element that can be coupled to the second handle frame  116   b  and the first body frame  126   a . The second handle frame  116   b  can provide a structural mating surface for mating to a first body frame  126   a , which when coupled together can form the rotational hinge joint described herein. 
     As further shown in  FIG.  10   , the rotational hinge joint can include a snap hinge assembly  310 . The snap hinge assembly  310  can include a retainer  312  and a gasket  314  fitted on to and around the retainer  312 . The retainer  312  can be snap fit or friction fit into the second handle frame  116   b  by seating the retainer within the opening  320  forming the fluid flow path in the rotational hinge joint  300  between the handle  110  and the body  120 , as shown in  FIG.  11   . The retainer  312  can be formed from a high friction material such as nylon, Teflon, or a similar plastic material to enable rotation of the handle  110  and body  120  with minimal effort. As further shown in  FIG.  11   , the gasket  314  can be secured onto the retainer  312 . The second handle frame  116   b  can include a plurality of snap fit features  304 . 
     As shown in  FIG.  12   , the handle hinge plate  302  can be coupled to the second handle frame  116   b  via the snap fit features  304 . The handle hinge plate  302  can include corresponding snap fit features on a surface opposing the snap fit features  304  to secure the handle hinge plate  302  to the second handle frame  116   b.    
     As shown in  FIG.  13   , the body hinge plate  306  can be configured to couple to the first and/or second body frames  720 ,  725 . The body hinge plate  306  can be formed of similar materials as the handle hinge plate  302 . The body hinge plate  306  can include a plurality of snap fit features  308  configured to couple with one or more body frames. 
     As shown in  FIG.  14   , a first body frame  126   a  can be coupled to the body hinge plate  306  via the one or more snap fit features  308 . As shown in  FIG.  15   , wiring W can be routed through the second handle frame  116   b  and through the opening  320  to couple with the heater assembly  600  arranged within the body of the hair care appliance. The wiring W can advantageously be routed peripherally of the fluid flow path traversing through the second handle frame  116   b , the opening  320 , and the first body frame  126   a  (as well as the second body frame  126   b ). In this way, obstruction of the fluid flow within the fluid flow path can be minimized or reduced. The wiring W can be located directly on or in immediate proximity of the second handle frame  116   b  and the first body frame  126   a  (or a second body frame  126   b ). 
     As shown in  FIG.  16   , the second body frame  126   b  can be coupled to the first body frame  126   a  via a plurality of snap fit features  128 . In this way, the first and second body frames  126   a ,  126   b  can form the outlet  122  at a distal end of the body (and the hair care appliance  100 ). As shown in  FIG.  17   , an O-ring  150  or similar ring-shaped flexible element can be applied to the terminal end of the coupled first and second body frames  126   a ,  126   b  to secure their engagement with one another. The O-ring  150  can also provide a flexible interface for an outlet frame structure configured to couple to the first and second body frames  126   a ,  126   b  at the outlet end of the hair care appliance  100 . 
     The appliance can also have a shape that facilitates grasping. As shown in  FIG.  19   , the body  120  of the appliance is cylindrical, however the handle  110  can have a tapered cylindrical shape along the entire handle length L h . In particular, the profile or the diameter of the handle  110  can change from a first location T 1 , a distance from the hinge joint  300 , to a second location T 2  at the terminal end of the handle  110 , such that the second location T 2  has a smaller diameter than the first location T 1 . This can allow a user to more easily grasp the appliance, while providing a larger profile or diameter at the joint  300  and in the body for internal components, such as the heater assembly. 
     In use, the rotational hinge joint allows a user to easily transform the hair care appliance from a straight configuration to an angled configuration with minimal to no reduction in flow velocity or pressure. This can be advantageous when performing different styling treatments in rapidly in sequence or when using attachments of the hair care appliance. In order to facilitate movement between the straight and angled or bent configurations, the hair care appliance  100  can include an actuation mechanism  340  shown in  FIG.  6   . In the illustrated embodiment, the actuation mechanism  340  is in the form of slidable button that is disposed against a spring of the actuation mechanism, such that retracting the actuation mechanism  340  loads the spring and releases latching mechanisms of the rotational hinge joint  300  so that the rotational hinge joint can rotate between the straight and bent configurations, as will be discussed in more detail below. Once the user has rotated the rotational hinge joint  300  to the second configuration, the user can release the actuation mechanism  340  and the latching mechanism of the rotational hinge joint  300  can re-engage to secure the rotational hinge joint  300  in the second configuration. 
     In certain exemplary embodiments, the amount of force required to release the hair care appliance  100  from the straight configuration and to allow rotation to the angled configuration can vary. For example, the amount of force for releasing the body  120  from the handle  110  in the straight configuration to initiate rotation of the hinge joint  300  into an angled configuration can be 3.1 N-3.6 N. The amount of force required for rotating the body  120  relative to the handle  110  in angled configurations can be 3.6 N-4.0 N. The rotational hinge joint  300  of the hair care appliance  100  can also be configured to require a certain amount of force to release the appliance from the angled configuration to allow rotation into the straight configuration. The amount of force for releasing the body  120  from the handle  110  in the angled configuration to initiate rotation of the hinge joint  300  into a straight configuration can be 5.1 N-5.3 N. The rotational hinge joint  300  can also be configured to require a certain amount of force to move the appliance into the straight configuration or the angled configuration from rotated positions. For example, the amount of force for moving the body  120  into a straight configuration with the handle  110  can be 4.5 N-5.3 N. The amount of force for moving the body  120  into an angled configuration with the handle  110  can be 6.2 N-6.7 N. The torque necessary to rotate the rotational hinge joint  300  can vary, but in an exemplary embodiment it can be between about 0.1 and 0.7 N. In other aspects, the rotational hinge joint  300  can be configured to release, rotate, and move the body  120  relative to the handle  110  to provide consistent tactile feedback when adjusting the body  120  into the straight or the angled configuration. 
     As previously indicated, with the appliance fully assembled, the appliance  100  can have a generally elongate cylindrical configuration. While the cross-sectional shape and dimensions of the handle  110  and body  120  can vary, in an exemplary embodiment the handle  110  is longer than the body  120 . As shown in  FIG.  18   , with the hair care appliance  100  in a straight configuration, the appliance can have a total length L t . The rotational hinge joint axis A can separate the device  100  into a handle length L h  and a body length L b . In an exemplary embodiment, the handle length L h  is about ⅔ of the total length L t , and the body length L b  is about ⅓ of the total length L t . However, the ratio of the handle length L h  and the body length L t  can vary. In some embodiments, the total length L t  of the appliance  100  in the straight configuration is in the range of about 26.0 cm to 31.0 cm. In an exemplary embodiment, the total length L t  of the appliance  100  in the straight configuration is 28.5 cm. As shown in  FIG.  19   , in the bent or angled configuration, the handle length L h  is in the range of about 19.5 cm to 24.5 cm, and the body length L b  is in the range of about 8.5 cm to 13.5 cm. In an exemplary embodiment, the handle length L h  is 22.0 cm. In an exemplary embodiment, the body length L b  is 11.0 cm. 
     The appliance  100  can also be configured to have a center of mass that properly balances the appliance in a user&#39;s hand in the bent configuration. The center of mass of the appliance  100  can be the location at which the distribution of mass is equal in all directions and does not depend on the gravitational field. In an exemplary embodiment, shown in  FIG.  19   , the hair care appliance  100  has a center of mass M that is in front of the handle  110  and below the body  120 . The arrangement of the components in the handle  110  and the body  120  can cause the center of mass M to be advantageously arranged as shown to provide an enhanced user experience holding and operating the hair care appliance  100  while exerting minimal effort by a user to secure the hair care appliance in their hand. In particular, the center of mass can be located forward of the handle and below the body to ensure neutral anatomical handling and reduced user fatigue when holding the hair care appliance in a user&#39;s hand. The motor  520  can be aligned with the heater assembly  600  to balance the center of mass M. 
       FIGS.  87 A- 88 B  illustrate an exemplary method for determining the center of gravity. The center of gravity (CG) of the appliance  100  depends on the gravitational field and is the location at which the distribution of mass is equal in all directions. As shown in  FIG.  87 A , the hair care appliance  100  can be separated into an appliance portion  100 A and a power supply portion  100 B. The CG can be determined in the appliance portion  100 A by measuring the mass and the location of the components included in the handle  110  and the body  120 . The CG was determined using computer-aided design software configured with a center of gravity function in which component locations are defined based on design parameters and component masses are assigned based on component material types. 
     In the illustrated embodiment, the location of the CG of the appliance portion  100 A is shown in  FIG.  87 B  with the appliance  100  in the straight configuration. The illustrated CG is located 150.5 mm from the base of the handle  110  (e.g., where the inlet  112  is located) as measured along Axis A extending through the center of the appliance portion  100 A. The CG is shifted radially outward from Axis A by 0.6 mm and thus is positioned on Axis B extending through the CG. 
     In  FIG.  88 A , the hair care appliance  100  is shown in the angled configuration. In  FIG.  88 B , the CG of the appliance portion  100 A is located 137.1 mm from the base of the handle  110  (e.g., where the inlet  112  is located) as measured along Axis A extending through the center of the appliance portion  100 A. The CG is shifted radially outward from Axis A and is located 12.0 mm from Axis A as shown by Axis C extending through the CG. 
     In  FIGS.  89 A- 89 C , the locations of the PCB  420 , the motor  520 , and the heating assembly  600  are shown measured from the base of the handle  110  (e.g., where the inlet  112  is located) of the appliance portion  100 A in the straight configuration. As shown in  FIG.  89 A , the center of the PCB  420  is located 82.43 mm from the base of the handle  110 . As shown in  FIG.  89 B , the center of the motor  520  is 150.63 mm from the base of the handle  110 . As shown in  FIG.  89 C , the center of the heating assembly  600  is 255.11 mm from the base of the handle  110 . In  FIG.  90   , the location of a center of the heating assembly  600  is shown for the appliance portion  100 A in the angled configuration. The location of the heating assembly  600  can be measured from Axis A extending from the base of the handle  110  (e.g., where the inlet  112  configured) through the center of the handle  110  and body  120 . In the angled configuration, the heater assembly can be 56.29 mm from Axis A and 189.22 mm from Axis D corresponding to the base of the handle  110 . The location of the PCB  420  and the motor  520  in the angled configuration can be the same as described in relation to  FIGS.  89 A- 89 C  corresponding to their location in the straight configuration of the appliance portion  100 A. 
     User Interface 
     The handle can also include a user interface  401  for enabling the user to provide inputs for operating the appliance, as shown in  FIG.  20   . In particular, the user interface can include one or more buttons or switches for powering the hair care appliance on and off, adjusting a temperature setting of the heater assembly (and thus adjusting the temperature of the fluid heated by the heater assembly), and adjusting a fan speed of the fan assembly (and thus, adjusting the velocity of the fluid expelled via the outlet). The user interface can also provide a button or switch for disengaging the heating assembly thus providing a cool, non-heated fluid from the outlet. 
     While the user interface can be positioned at various locations, in an exemplary embodiment, the user interface  401  extends longitudinally along at least a portion of the handle  110 . As shown in  FIG.  20   , it extends from base of the handle, i.e., the terminal most end, and it intersects the filter assembly  200  as shown, and can extend toward the rotational hinge  300  joint, terminating a small distance from the rotational hinge joint  300 . The user interface  401  can be provided on a scalloped portion of the handle having raised edges along opposed sides of the user interface  401  to facilitate gripping of the handle  110  by a user. The user interface  401  can extend between first handle housing  114   a  and the second handle housing  114   b . In another embodiment, the user interface  401  can intersect the filter  230 . 
     The wiring coupling the user interface to the electrical components (e.g., the printed circuit boards) can be routed to the sides of the user interface, and not directly under the user interface, to ensure the fluid flow path is not restricted or limits fluid flow. 
     As indicated above, the user interface  401  can include one or more buttons or engagement features configured to control operation of the hair care appliance based on user inputs. For example, the user interface  401  can include a blow-out feature  402 . The blow-out feature  402  can cause the heater assembly  600  to shut off so that only non-heated air is exhausted through the outlet. In some embodiments, the blow-out feature  402  can be located remotely from the user interface  401  or within the user interface  401  but remotely from other features of the user interface. 
     The user interface  401  can also include a fan setting feature  404 . The fan setting feature  404  can be configured to control a speed of the fan assembly  500 . The fan setting feature  404  can be repeatedly selectable to generate high, medium, and low velocity fluid flow by the fan assembly  500 . 
     The user interface  401  can also include a temperature setting feature  406 . The temperature setting feature  406  can be configured to control a temperature of the heater assembly  600  and thus the fluid flow exiting the outlet  122  of the hair care appliance  100 . The temperature setting feature  406  can be repeatedly selectable to heat the fluid flow to very high, high, medium, or low temperatures. In some embodiments, the high temperature setting can cause the heater assembly to heat the fluid flow to 100 degrees C. 
     As further shown in  FIG.  20   , the user interface  401  can include a power feature  410 . The power feature  410  can be configured to control provision of power from the power supply to the electrical components of the hair care appliance. The user interface  401  can include one or more tactile features  408 , as indicated above. The tactile features  408  can be raised edges or gripping features configured to improve the users grip and manual dexterity when holding or operating the hair care appliance. 
     In some embodiments, the features of the user interface  401  can be configured to avoid accidental engagement by the user. For example, the features can be recessed and require explicit engagement to trigger a particular user engagement feature. The low-profile or recessed design of the buttons or switches of the user interface can enable a user to operate the hair care appliance without mistakenly contacting an unintended button or switch. In some embodiments, any of the features of the user interface  401  described herein can be configured with lighting or illuminated elements that can illuminate a button, switch, or surface of the user interface  401 , such as an inner or under surface of the user interface. The arrangement and styling of the user interface features described herein can be provided in a variety of non-limiting configurations on the handle of the hair care appliance described herein. 
     Electronics 
     As previously indicated, the hair care appliance can include a power supply coupled to the inlet end (e.g., the proximal end) of the handle. The power supply can penetrate the inlet end and can provide power to electrical components configured within the handle and the body. The electrical components can be coupled to the power supply via cables or wiring. The electrical components can include portions of the fan assembly (e.g., the motor), and the heater assembly (e.g., the heating elements), as well as one or more printed circuit boards (PCBs). The PCBs can be arranged in the fluid flow path within the handle, and can be arranged relative to one another so as to provide a gap between the PCBs to allow fluid to flow more readily through the fluid flow path in the handle. For example a first PCB can be arranged above or below a second PCB and a gap can separate the two PCBs. Advantageously, the placement of the PCBs in the fluid flow path can also enable cooling of the components configured on the PCBs. 
     The PCBs can include components, such as resistors and capacitors that can be arranged on the PCBs. The arrangement of the PCB components can be configured to maximize the fluid flow across the PCB. For example, the PCB components can be aligned with the longitudinal axis of the fluid flow path, rather than aligned transverse to the fluid flow path to provide more efficient fluid flow within the fluid flow path across the PCB. 
     The electrical components of the hair care appliance can be coupled to one another and to the power supply via one or more connectors. The connectors can join portions of wire and electrically couple the electrical components. The arrangement of the connectors can be provided to ensure fluid flow is maintained through the fluid flow path and that fluid flow is not reduced. For example, connectors can be positioned inferiorly on the PCB as close as possible to the power supply. In some embodiments, the connectors associated with the motor and heater assembly can be arranged at the distal end of a PCB (e.g., an edge of a PCB that is closest to the motor and heater assembly) and can include longitudinally oriented wiring that is parallel to the fluid flow path. The wiring between connectors can also be arranged in parallel with the longitudinal axis of the handle, the body, and the fluid flow path extending between the inlet and the outlet. In some embodiments, the user interface (UI) PCB assembly may be separated from the main PCB assembly to reduce hair ingress from the UI. 
       FIG.  21    shows the internal electrical components of the hair care appliance. As shown, the handle  110  can receive a power supply that can be electrically coupled to one or more PCBs  420 . The PCBs  420  can be further electrically coupled to one or more features  402 ,  404 ,  406 ,  410  of the user interface  401  described in relation to  FIG.  20   . The PCBs  420  can also be electrically coupled to the fan assembly  500  and the heater assembly  600  located in the body  120  of the hair care appliance  100 . The electrical coupling between the PCBs and the power supply  410 , the user interface features  402 ,  404 ,  406 ,  410 , the fan assembly  500 , and the heater assembly  600  can be achieved via one or more connectors and one or more wires. For example, wiring W can be configured to couple the PCBs  420  to the heater assembly  600 . The wiring W can be configured peripherally with respect to the opening extending through the rotational hinge joint  300  so that the fluid flow passing through the handle  110  and the rotational hinge joint  300  into the body  120  is not obstructed or reduced. 
       FIG.  21    shows the fluid flow path P illustrated with dashed lines flowing over and through the electrical components. The arrangement of the PCBs  420 , the user interface features  402 ,  404 ,  406 ,  410 , and the wiring W can be configured to maximize the flow of fluid with minimal reductions in velocity or pressure as the fluid passes along the fluid flow path F. A diverter  504  can further aid efficient fluid flow distribution to the fan assembly  500 . 
     As shown in  FIG.  22   , a first PCB  420   a  and a second PCB  420   b  can be separated from one another by a gap or space  430 . The height or size of the gap or space  430  can be configured to maximize fluid flow within the fluid flow path extending through the handle and over/around the PCBs  420 . In some embodiments, the gap can be 1.5-2.0 mm. In certain exemplary embodiments, the gap can be 1.84 mm. The second PCB  420   b  may be configured to control the user interface and external controls. The second PCB  420   b  may be positioned such that it limits hair ingress to the first PCB  420 A. As further shown in  FIG.  22   , the PCBs  420  can include several different electrical elements including but not limited to a connector  440 , a capacitor  450 , a processor  460 , as well as resistors, transistors, diodes, circuits, sensors, or electromechanical elements. A heat sink or shield  470  can also be configured with respect to one or more of the PCBs  420 . In some embodiments, the electrical components  400  can weight 46.1 g. 
     As shown in  FIG.  23   , the PCBs  420  can include a metal-oxide varistor (MOV)  480 . The PCBs  420  can also include a negative temperature coefficient (NTC) sensor  490 . The arrangement of the MOV  480  and the NTC sensor  490  can be provided on the PCBs  420  to reduce fluid flow resistance caused by the shape of the MOV  480  and the NTC sensor  490 . For example, the MOV  480  and the NTC sensor  490  can be mounted vertically as shown in  FIG.  23    so that a narrower cross-section of each component interfaces with the fluid flow passing through the fluid flow path P. 
     The electrical components  400  can be coupled to a power supply  410 . As shown in  FIG.  68   , the power supply  410  can couple to a power supply cord  130 . The power supply cord  130  can include an EMC enclosure  6800  configured between a terminal end of the power supply cord  130  and the hair care appliance  100 . The EMC enclosure  6800  can include a cover or housing  6805 . As shown in  FIG.  69   , the housing  6805  has been removed to illustrate a front view of the electrical components  6810  that can be arranged on a PCB  6815  within the EMC enclosure  6800 . The rear of the PCB  6815  can be seen  FIG.  70   . 
     As explained above, the placement of electrical components on the PCBs is optimized to maintain fluid flow along the fluid flow path. Similarly, the PCBs can include a space or gap between two PCBs so that fluid can flow through the gap and around each of the PCBs. In this way, electrical components on the PCBs receive a cooling effect from the fluid flow and the fluid flow path is not obstructed so that fluid flow is maintained with minimal reduction in fluid velocity. 
     Fan Assembly 
     As previously indicated, the fan assembly  500  is positioned downstream of the electrical components. The position of the fan assembly  500  is designed to be balanced within the handle  110  and also to be in proximity of the rotational hinge joint  300  to improve fluid flow. The fan assembly generally includes a motor coupled to an impeller or fan having a plurality of blades. Positioning the motor in the handle at the location where the user would grip the hair care appliance can advantageously reduce vibration of the motor during operation. In operation, the motor can cause the fan to rotate to draw fluid into the inlet of the handle and into the fluid flow pathway. The fluid can be drawn toward the fan and expelled over the heater assembly and out of the hair care appliance via the outlet. 
     As shown in  FIG.  24   , fan assembly  500  is located along the fluid flow path P forward of the electrical components  400 , and at the distal end of the handle along the fluid flow path immediately downstream of the rotational hinge joint. In this way, the fan assembly can provide an improved fluid flow through the rotational hinge joint, such as in the angled configuration, into the heater assembly and the outlet in the body with minimal reduction in fluid flow. The placement of the fan assembly  500  in the handle  110  can also advantageously reduce vibration of the fan assembly  500  when in operation as a result of the insulative effect of the user&#39;s hand. In some embodiments, the fan assembly  500  can weigh 71.6 g. 
     As shown, the fan assembly  500  has include a housing  506  covering the motor and fan blades of the fan assembly  500 . In some embodiments, the fan assembly housing  506  can be a rubber isolation damper. The fan assembly  500  can also include a diverter  504 . The diverter  504  can be configured in the fluid flow path P extending from the inlet  112  to the outlet  122 . In particular, the diverter  504  can include a dome-shaped portion  508  coupled to an annular frame  510  by one or more dome supports  512 . The dome-shaped portion  508  can be configured to distribute the fluid flow radially through the fan assembly housing  506  and on to the peripheral edges of the fan blades. In this way, the fan blades of the fan contained within the fan housing  506  can receive an even distribution of fluid flow allowing the fan to generate an even fluid flow distribution downstream (e.g., toward the outlet  122 ) of the fan assembly  500 . 
     As shown in  FIG.  25   , the fan assembly  500  can include a motor  520  and a fan  530 . The fan  530  can be coupled to a central shaft extending from the motor  520 . The fan  530  can include a plurality of fan blades  532 . In operation, the motor  520  can cause the fan  530  to rotate and draw fluid into an inlet of the handle  110  and along the fluid flow path toward the diverter  504 . The dome-shaped portion  508  can distribute the fluid flow to the outer edges of the fan blades  532  so that the volume of the fluid and the velocity of the fluid can be efficiently maintained. The fluid flow can pass from the fan blades  532  into a motor frame  522 . The motor frame  522  can include curved vanes that are arranged downstream of the fan to smooth and straighten the fluid flow exiting the fan. The fan assembly  500  can direct the fluid flow through the rotational hinge joint  300  and toward a diverter  602  located upstream (e.g., toward the fan assembly  500 ) of a heater assembly  600  located in the body  120 . In some embodiments, the fan assembly can generate a fluid flow at a velocity between 25-35 m/s. 
     Heater Assembly 
     As indicated above, the hair care appliance can include a heater assembly in the body  120 . The heater assembly can be configured to control a temperature of the fluid flow between 60-100 degrees Celsius. The heater assembly can be spaced apart from the rotational hinge joint to provide a smooth, even fluid flow of the fluid entering the heater assembly. The heater assembly can be positioned in the fluid flow path extending through the body and can heat the fluid as it is provided to the outlet of the body. The heater assembly can include an inner support structure including a central shaft and a plurality of planar segments extending along and radially from the central shaft. The planar segments can have cut-out portions therein to ensure that the fluid flow is maximized as it passes through the heater assembly. One or more heating elements can be arranged on the planar segments and can be coupled to the PCBs in the handle via cables or wiring. The heating assembly wiring can be located immediately adjacent to and along the inner surface of the handle, rotational hinge joint, and body so that the fluid flow path is not obstructed and fluid flow reduced. The heating assembly  600  may further contain an ionizer  7100  shown in  FIG.  71   . The ionizer  7100  can include an ionizer emitter  7105  that is in the heated fluid flow path P. In some embodiments, the heater assembly  600  can weigh 29.9 g. 
     The heater assembly can also include at least one thermistor and at least one fuse that can each be electrically coupled to the PCBs via wires. The thermistor can be configured to measure temperature data of the fluid flowing through the heater assembly. The fuse can be configured as a safety switch or electrical cut-off, that when faulted will disconnect the electrical current provided to the heating elements to prevent overheating of the heater assembly. The thermistor and the fuse can be located at the outlet end of the body and can be positioned on an upper aspect of the heater assembly to further ensure the fluid flow through the heater assembly is evenly distributed between the upper and lower aspects of the heater assembly and evenly distributed radially within the body. In some embodiments, the thermistor and the fuse can be located on the same planar segment. In other embodiments, the thermistor and the fuse can be located on different planar segments. In some embodiments, the heater assembly can include a thermal cut-off (TCO) configured on a planar segment and electrically coupled to the thermistor and the fuse. The TCO can be a resettable thermal control component that can be programmed to shut-off power to the heating elements when the temperature of the fluid exceeds a pre-determined threshold. 
       FIG.  26    illustrates the heater assembly  600  in more detail. As shown, the heater assembly includes a plurality of heating elements  604  configured on one or more planar segments  606  of an inner support structure  608 . Wiring W can electrically couple the heater assembly  600  to the electrical components  400  and the power supply  410  described in relation to  FIG.  21    to provide power to the heater assembly  600 . The wiring W can be routed through the rotational hinge joint  155  along an inner surface of the body frames forming a periphery of the rotational hinge joint  300 . In this way, disruption of the fluid flow within the fluid flow path passing through the rotational hinge joint  300  can be minimized and flow velocity and pressure can be maintained in an evenly distributed flow pattern provided to the heater assembly  600 . 
     As shown in  FIG.  27   , one or more of the planar segments  606  can include a cut-out portion  606   c  configured to equalize fluid flow through the heater assembly  600 . The cut-out portions  606   c  can allow the fluid flow to equalize in a uniform manner while flowing through the heater assembly  600 . The cut-out portions  606   c  allow can enable the planar segments  606  to support the heating elements  604  while also creating a space for the fluid flow to equalize and be evenly distributed as it flows through the heater assembly  600 . The cut-out portions  606   c  can have a variety of non-limiting shapes and sizes. For example, the cut-out portions  606   c  can include rectangular shapes, square shapes, circular shapes, geometric shapes, or ellipsoid shapes. In some embodiments, the cut-out portions  606   c  can extend longitudinally along a majority of the planar segments  606 . In some embodiments, the cut-out portions  606   c  can extend radially on the planar segments  606 . In some embodiments, the cut-out portions  606   c  can extend in curved patterns on the planar segments. 
     In some embodiments, the planar segments  606  can be configured in a variety of non-limiting configurations with respect to a central portion of the inner support structure  608 . For example, a plurality of planar segments can be arranged as spokes extending radially outward from the central portion of the inner support structure  608 . In some embodiments, the inner support structure  608  can include additional configurations of the planar segments  606  which may not be formed with respect to a central portion of the inner support structure  608 , such as a helical-shaped arrangement of planar segments  606 , a box-shaped arrangement of planar segments  606 , or a cylindrical arrangement of planar segments  606 . The ionizer  7100  can be coupled to a planar segment  606 . 
     As shown in  FIG.  28   , the plurality of heating elements  604  can be arranged on and extending around the plurality of planar segments  606 . A variety of non-limiting shapes or arrangements of the heating elements  604  can be envisioned. The heating elements  604  can be electrically coupled to the wiring W, such that when power is received the heating elements  604  can radiate heat that can be transferred to the fluid flowing through the heater assembly  600 . An outer cylindrical housing  610  can surround the heater assembly. 
     One or more electrical components can also be included in the heater assembly  600 . For example, a thermistor  615  can be arranged in the fluid flow path and can be electrically coupled to the wiring W via wires  612  and  614 . The wires  612  and  614  can form a U-shaped configuration with respect to the thermistor  615 . Other shaped wiring configuration is envisioned. The heater assembly  600  can also include a fuse  620  that can be electrically coupled to the wiring W. The fuse  620  can provide a safety mechanism by which the heater assembly (and the hair care appliance) is shut off in the event a temperature of the heater assembly exceeds a predetermined temperature threshold. The heater assembly can also include a thermal cut-off component electrically coupled to the wiring W. The thermal cut-off can be a programmable and resettable electrical safety components that can allow modification of the predetermined temperature threshold. 
     In use, the heater assembly  600  is configured to maintain optimal fluid flow through the heating elements to the outlet. The arrangement of the thermistor and the fuse can be provided to ensure even radial distribution of the fluid flow. The planar segments of the inner support structure can have cut-out portion to ensure maximal fluid flow across and over the heating elements. 
     Fluid Flow Path 
     As indicated above, the hair care appliance  100  has a fluid flow path P extending between the inlet  120  of the handle  110  and the outlet  125  of the body  120 . As previously indicated, a first diverter  504  is positioned in the handle  110 , and a second diverter  602  is positioned in the body  120 . 
     The diverter  602  can be configured as a baffle structure and can partition the fluid flow exiting the fan assembly  500  into separate and uniform upper and lower flow paths F u , F L  entering the heater assembly  600 . Without the diverter  602 , the fluid flow would tend to accumulate in the upper portions of the heater assembly  600  and less fluid flow would pass through the lower portions of the heater assembly  600 . The diverter  602  can address this problem by causing equal volumes of fluid can enter the heater assembly  600  so that a uniform distribution of heat can be transferred to the equal volumes of fluid. Advantageously, the diverter  602  can produce a minimal reduction of fluid flow for the fluid entering the heater assembly  600 . In an exemplary embodiment, the diverter  602  includes rounded, non-sharp edges so that the fluid flow is free of turbulence as the flow passes over and around the diverter  602 . Further, the diverter  602  can maintain flow velocity, static flow pressure, and top-to-bottom pressure gradients between the upper and lower portions of the heater assembly  600  in both the straight configuration and the angled configuration of the hair care appliance described herein. As shown in  FIG.  30   , the fan assembly cover has been removed from the fan assembly  500  for illustration of the fluid flow path P. In some embodiments, the fluid flow path P can be a sealed fluid flow path such that loss of fluid flow from the appliance to the environment is minimized. 
     In an exemplary embodiment, in the angled configuration the hair care appliance described herein can achieve a max:min flow rate ratio of 1.7 with a pressure drop of 1700 Pa along the length of the fluid flow path, and in the straight configuration, the hair care appliance can achieve a max:min flow rate ratio of 1.6 with a pressure drop of 1900 Pa along the length of the fluid flow path. Thus, the flow rate ratio at maximal and minimal flow rates for the angled configuration relative to the straight configuration is 94-95%. As such, the fluid flow rate in the angled configuration is only 5-6% less than the fluid flow rate in the straight configuration. The hair care appliance can advantageously maintain and provide sufficiently equal flow rates in either the straight configuration or the angled configuration with minimal reduction in flow rate in the angled configuration. 
     As shown in  FIG.  31   , plot S illustrates velocity (m/s) data of a fluid flow flowing through the hair care appliance in a straight configuration. As shown, the velocity of the fluid flow exhibits minimal changes as the fluid flow passes from the handle  110  through the rotational hinge joint  300  and into contact with the diverter  602 . Advantageously, the diverter  602  allows a generally equal distribution of upper and lower portions of the fluid flow to pass into the heater assembly  600  of the body  120  with minimal to no changes in fluid velocity in the straight configuration of the hair care appliance. The generally equal distribution of the fluid flow prevents overheating within the heater and consistent heat output. The resultant flow output at the outlet  122  further illustrates the consistent and substantially equal fluid velocity exiting the upper and lower portions of the outlet  122  due to the configuration of the diverter  602 . In the straight configuration, the velocity (m/s) was measured at 1″ from the outlet  122  and 4″ from the outlet  122  at high, medium, and low speed settings of the fan assembly  500 . The results are shown in Table 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Velocity (m/s) @ 
                 Velocity (m/s) @ 
               
               
                   
                 1″ from Outlet 122 
                 4″ from Outlet 122 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 High 
                 35.6 
                 27.8 
               
               
                   
                 Medium 
                 24.8 
                 20.8 
               
               
                   
                 Low 
                 22.7 
                 18.9 
               
               
                   
                   
               
            
           
         
       
     
     As shown in  FIG.  32   , plot B illustrates velocity (m/s) data of a fluid flow flowing through the hair care appliance described herein in angled configuration. As shown, the velocity of the fluid flow exhibits minimal changes as the fluid flow passes from the handle  110  through the rotational hinge joint  300  and into contact with the diverter  602 . Advantageously, the diverter  602  allows an equal distribution of upper and lower portions of the fluid flow to pass into the heater assembly  600  of the body  120  with minimal to no changes in fluid velocity in the angled configuration of the hair care appliance. The resultant flow output at the outlet  122  further illustrates the consistent and substantially equal fluid velocity exiting the upper and lower portions of the outlet  122  due to the configuration of the diverter  602 . In the angled configuration, the velocity (m/s) was measured at 1″ from the outlet  122  and 4″ from the outlet  122  at high, medium, and low speed settings of the fan assembly  500 . The results are shown in Table 2. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                 Velocity (m/s) @ 
                 Velocity (m/s) @ 
               
               
                   
                 1″ from Outlet 122 
                 4″ from Outlet 122 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 High 
                 31.8 
                 25.9 
               
               
                   
                 Medium 
                 25.5 
                 20.0 
               
               
                   
                 Low 
                 20.9 
                 17.4 
               
               
                   
                   
               
            
           
         
       
     
     Comparing the velocity data associated with the straight configuration and the velocity data associated with the angled configuration, angling the fluid flow path causes only a minimal reduction in the velocity of the fluid flow at each speed setting. For example, at the high speed setting in the angled configuration, the velocity of the fluid flow measured 1″ from the outlet  122  is 89% (e.g., 31.8 vs. 35.6) of the fluid flow observed in the straight configuration. At the high speed setting in the angled configuration, the velocity of the fluid flow measured 4″ from the outlet  122  is 93% (e.g., 25.9 vs. 27.8) of the fluid flow in the straight configuration. At the medium speed setting in the angled configuration, the velocity of the fluid flow measured 1″ from the outlet  122  is 103% (e.g., 25.5 vs. 24.8) of the fluid flow in the straight configuration. At the medium speed setting in the angled configuration, the velocity of the fluid flow measured 4″ from the outlet  122  is 96% (e.g., 20.0 vs. 20.8) of the fluid flow in the straight configuration. At the low speed setting in the angled configuration, the velocity of the fluid flow measured at 1″ rom the outlet  122  is 92% (e.g., 20.9 vs. 22.7) of the fluid flow in the straight configuration. At the low speed setting in the angled configuration, the velocity of the fluid flow at 4″ from the outlet  122  is 92% (e.g., 17.4 vs. 18.9) of the fluid flow in the straight configuration. Advantageously, at the medium speed setting, the velocity of the fluid flow through the hair appliance in the angled configuration is greater than the velocity of the fluid flow in the straight configuration as measured at 1″ from the outlet  122  (e.g., 25.5 m/s vs. 24.8 m/s). 
     Accordingly, the configuration of the appliance and the various internal components allow for a fluid flow path that has an even, consistent fluid flow throughout the diameter of the handle and the body between the inlet and the outlet in the straight configuration and the angled configuration. The configuration of the first diverter  504  can provide a uniformly, radially distributed fluid flow through the handle and to the blades of the fan assembly so that the fan does not accelerate the fluid flow unevenly into the heater assembly of the body. The configuration of the second diverter  602  can provide a balanced fluid flow to upper and lower aspects of the heater assembly such that a uniform distribution of fluid is provided through the heater assembly and out of the hair care appliance via the outlet in the body. The heater may operate at a higher temperature due to the evenly spaced airflow preventing any heat buildup on the side of the heater during use. 
     Accessory Mating 
     As previously indicated, the hair care appliance can further be configured to mate to one or more accessories for user-selected hair styling or hair treatment. The one or more attachments can have any configuration, such as a concentrator, a diffuser, a curling iron, a curling brush, a round brush, a flat brush, a comb, etc. The attachments can removably couple to the outlet in the body of the hair care appliance and can be secured in place via one or more mating mechanisms configured at the outlet of the body and/or on a mating portion of an individual attachment. 
     In some embodiments, the hair care appliance can include an attachment that is not removable and is permanently attached to the hair care appliance. For example a brush can be permanently attached and the hair care appliance can be a “hot” brush configuration. The “hot” brush configuration can include a non-detachable brush that is affixed to the hair care appliance described herein. 
     In some embodiments, the attachment can be configured to sleeve over the body of the hair care appliance, thereby covering the outlet. The sleeved attachment can further extend over the rotational hinge joint in the straight configuration to prevent rotation of the appliance. The sleeve over the rotational hinge joint may provide additional structural support to the hinge during use. The sleeve over the rotational hinge may further prevent the appliance from changing configuration during use. For instance, the hair care appliance may have a latch or button that allows rotation of the body relative to the handle. In some embodiments, the sleeve over attachment might cover the latch or button such that it cannot be actuated during use of the attachment. 
     Various features can also be provided to aid in preventing rotation of the attachment relative to the body of the appliance. For example, a sleeve attachment can include features on an inner surface, such as longitudinally oriented ribs on the inner surface, that can engage with one or more protrusions provided on an outer surface of the body housing  124 . For example, as shown in  FIG.  33   , the body housing  124  of the appliance  100  includes a recess  350  that seats a first protrusion  352   a  at a location adjacent to the hinge joint  300 . The first protrusion  352   a  can engage with a portion of an inner surface of an attachment that has been slid over the body housing  124 . As shown in  FIG.  34   , in which the body housing  124  is removed, a second protrusion  352   b  can be positioned on an opposite side of the body and can protrude from the first body frame  126   a . The first protrusion  340   a  is shown protruding from the second body frame  126   b.    
     The hair care appliance  100  can include a plurality of interchangeable attachment mating assemblies. For example, a first attachment mating assembly can include a sleeving design to allow an attachment to be sleeved over an outlet end of the hair care appliance  100 . A second attachment mating assembly can include a faceplate mating design such that an attachment abuts the outlet end of the hair care appliance. A third attachment mating assembly can include a mating collar configured with protrusions, such as lugs, which can be removably coupled with and secured within a mating portion of an attachment. 
       FIG.  35 A  shows a close-up perspective view of an attachment mating assembly  700  configured at the outlet  122  of the hair care appliance  100 . The attachment mating assembly  700  can be coupled to the first and second body frames  126   a ,  126   b . As shown, the attachment mating assembly  700  includes a mating collar  702  and a mating plate  708 . The mating collar  702  can include a plurality of recesses  704  arranged around the circumference of the mating collar  702 . The recesses  704  can be configured to receive one or more engagement features of an attachment configured for use with the hair care appliance, as will be discussed in more detail below. The attachment can slide over the outlet  122  of the body  120  and the engagement features of the attachment can engage and be seated within the recesses  704  of the mating collar  702  to reduce rotation of the attachment relative to the body  120 . Rotation can be reduced or limited by way of projections  706  bounding either side of a given recess  704 . 
     Another embodiment of an attachment mating assembly can  6310  be seen in  FIG.  35 B . The outlet end  6300  in the body  6305  of a hair care appliance similar to appliance  100  can include an attachment mating assembly  6310 . The attachment mating assembly  6310  can include attachment mating plates  6114   a  and  6114   b , each of which can include a plurality of slots  6320 . When an attachment with attachment features, such as attachment features  6225  of a concentrator attachment  6200  shown in  FIG.  62   , is coupled to the outlet end  6300 , a user can rotate the concentrator attachment  6200  to engage the attachment features  6225  within the slots  6114   a  and  6114   b  and secure the concentrator attachment  6200  to the hair care appliance  100 . 
     The attachment mating assembly  700  can also include a mating plate  708  arranged inferiorly (e.g., upstream of the outlet  125 ) to the mating collar  702 . The mating plate  708  can include an upper surface  708   u  onto which a surface of an attachment can abut. The mating plate  708  can also include a mating plate shoulder  708   s  extending from the upper surface  708   u . The mating plate shoulder  708   s  can be sized and configured to insert into a receiving portion arranged at a coupling end of an attachment. 
     As shown in  FIG.  36   , the attachment mating assembly  700  can also include an outlet trim ring  710  coupled to the mating collar  702 . The outlet trim ring  710  can include one or more surface finishes or applied materials. The mating plate  708  can couple to the first and second body frames  126   a ,  126   b  via a snap fit or friction fit or using other attachment technique. 
     As shown in  FIG.  37   , the mating collar  702  can include an engagement shelf  712 . The engagement shelf  712  can be circumferentially located on the mating collar  702  inferior (e.g., below) to the recesses  704  and the projections  706 . The engagement shelf  712  can be sized and configured to receive one or more engagement features of an attachment. For example, a hook-shaped engagement feature of an attachment can engage the engagement shelf  712  to couple an attachment to the attachment mating assembly  700 . In some embodiments, the engagement shelf  712  can be segmented into segments by one or more slots separating respective segments. 
     In other embodiments, the attachment mating assembly can include a mating collar with protruding features, such as lugs, to engage with a mating portion of an attachment to secure the attachment to the outlet end of the hair care appliance  100 . The mating portion of the attachment can include slots in which the lugs can be received. The lugs of the mating collar can be engaged into openings of the slots of the mating portion of the attachment and the attachment can be rotated onto the outlet end of the hair care appliance  100  to cause the lugs to travel fully within the slots of the attachment mating portion. 
     Attaching or detaching an attachment onto the outlet of the hair care appliance can be performed using an attachment actuator assembly configured at the outlet end of the hair care appliance. The attachment actuator assembly can include a user-operable latch configured to secure or release the attachment to the hair care appliance  100 . A user can retract the latch to attach and remove an attachment and can release the retracted latch to secure the attachment in place. The latch can be coupled to a tab insertable into an opening of at least one slot of the mating portion of the attachment. When the tab is inserted within the slot opening, rotation of the attachment relative to the outlet end of the hair care appliance is eliminated and the attachment is secured to the hair care appliance. 
       FIG.  72    shows an exemplary embodiment of an attachment mating assembly  7200  of the hair care appliance  100 . The attachment mating assembly  7200  includes a mating collar  7205  at an the outlet  122  and an attachment actuator assembly  7215  provided on the body housing  124 . The mating collar  7205  can include one or more protrusions  7210 . In some embodiments, the protrusions  7210  can be lugs and can protrude from an inner surface of the mating collar  7205 . As shown in  FIG.  73   , the protrusions  7210  can protrude from an inner surface  7220  of the mating collar  7205 . In some embodiments, the protrusions  7210  can have a tear-drop shape, although a variety of non-limiting shaped can be envisioned. The shape and dimensions of the protrusions  7210  can correspond to a shape and dimension of a corresponding receiving portion or slot that can be configured on a mating portion of an attachment of the hair care appliance  100 . In some embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 protrusions  7210  can be configured on the inner surface  7220  of the mating collar  7205 . In some embodiments, the protrusions  7210  can be spaced apart along the inner surface  7225  by an equal distance between adjacent protrusions  7210 . In some embodiments, the protrusions  7210  can be spaced apart along the inner surface by an unequal distance between adjacent protrusions  7210 . 
     The mating collar  7205  also includes at least one recession  7230  configured to receive a tab or protruding portion of the attachment actuator assembly  7215 . The recession  7230  can have a width  7235  corresponding to a width of the tab or protruding portion of the attachment actuator assembly  7215 . As an attachment is mated with the mating collar  7205 , the protrusions  7210  can travel into the slots configured on the mating portion of the attachment. Once travel is complete the user can release the latch  7220  of the attachment actuator assembly  7215  (such as the latch shown in  FIG.  1   ) so that the tab portion of the attachment actuator assembly  7215  travels into the recession  7230  locking the attachment in place to prevent rotation of the attachment. 
     The mating collar  7205  can also include an opening  7240  along the circumference of the bottom portion of the mating collar  7205 . The opening  7240  can receive the attachment actuator assembly  7215  therein. The opening  7240  can have a width  7245  corresponding to a width of the attachment actuator assembly  7215 . The mating collar  7205  can also include one or more shoulder elements  7250  protruding from sides of the mating collar  7205  at one or more locations. The shoulder elements  7250  can be configured to allow the mating collar  7205  to friction fit or snap fit with an outlet ring, such as the outlet ring  7715  shown in  FIG.  77   . The mating collar  7205  can also include slots  7255  positioned at one or more locations around the circumference of the outer surface  7260  of the mating collar  7215 . The slots  7255  can be configured to secure the mating collar  7205  to the body housing  124 . 
     The attachment actuator assembly  7215  can include a latch  7220  as shown in  FIG.  72   . The latch  7220  can be coupled to a base  7260  of the attachment actuator assembly  7215  as shown in  FIG.  74   . In some embodiments, the latch  720  can be integrated with the base  7260 . The base  7260  can be coupled to a compression element  7265  of the attachment actuator assembly  7215 . Depressing the latch  7220  can cause the base  7260  to compress the compression element  7265  so that the base is retracted away from the mating collar  7205 . In some embodiments, the compression element  7265  can be a spring as shown in  FIG.  74   . The base  7260  can travel within a body frame  7275  of the hair care appliance. The body frame  7275  can correspond to a first body frame  126   a  or a second body frame  126   b  as shown and described in relation to  FIG.  7   . The base  7260  can also include a protruding portion or tab  7280 . In some embodiments, the protruding portion  7280  can be coupled to the base  7260 . The tab  7280  can extend from the base  7260  into the mating collar  7205  so as to secure an attachment within the mating collar  7205 . For example, after a user has coupled an attachment to the mating collar  7205 , the user can release the latch  7220 . As a result, the compressible element  7265  can extend to push the base  7260  toward the mating collar  7205  such that the tab  7280  extends into the recession  7230  shown in  FIG.  73    and into the slot included in the mating portion of the attachment. In  FIG.  75   , the mating collar  7205  has been removed to illustrate the tab  7280  extending from the base  7260  of the attachment actuator assembly  7215 . Retracting the latch  7220  can cause the tab  7280  to move away from and out of the mating collar  7205  so that the attachment can be removed from body housing  124 . 
     The attachment actuator assembly  7215  can be seen in more detail in  FIG.  76 A  showing the attachment actuator assembly  7215  engaged with an attachment mating portion  7600  of an attachment according to embodiments described herein. As shown in  FIG.  76 A , the body housing  124  has been removed for illustration and the exterior of the attachment mating portion  7600  can be viewed. The attachment mating portion  7600  can include an attachment mating collar  7605 . The attachment mating collar  7605  can include one or more slots  7610 . The slots  7610  can include an opening at which the tab  7280  can be received. When the latch  7220  is released, the tab  7280  can extend or travel into the slot  7610  to secure the attachment mating portion  7600  to the outlet  122  of the body  120  of the hair care appliance  100 . In  FIG.  76 B , a cut-away view of the attachment actuator assembly  7215  engaged with the attachment mating portion  7600  is shown. The cut-away view shows an internal perspective of the attachment actuator assembly  7215  engaged with the mating collar  7205 , as well as the protrusions  7210  engaged with the attachment mating portion  7600 . The user has rotated the attachment mating portion  7600  into contact with the mating collar  7205  such that the protrusions  7210  have traveled into a receiving end located at a terminal end of the slot  7610  as shown in  FIG.  76 B . Once the protrusions  7210  are engaged fully within the slot  7610 , the user can release the latch  7220  causing the tab  7280  to extend or travel into the slot  7610  to fully secure the attachment mating portion  7600  (and thus, the attachment) to the mating collar  7205  of the hair care appliance  100 . Rotation of the attachment relative to the body  120  can thus be reduced or eliminated. 
     The hair care appliance  100  can also include a grill  7700  configured at the outlet  122  as shown in  FIG.  77   . The grill  7700  can include a plurality of vane elements  7705  extending radially from a center portion  7710 . Although the vane elements  7705  of the grill  7700  are shown in a radial-shaped pattern, a variety of non-limiting patterns can be envisioned including a diagonal-shaped pattern, a mesh-shaped pattern or a concentric-shaped pattern of vane elements  7705 . The outlet  122  can also include an outlet ring  7715 . The outlet ring can couple to the mating collar  7205  via snap fitting. 
     Accessories 
     As explained above, the hair care appliance can be configured to mate to a number of different types of attachments or accessories via interchangeable mating assemblies of the hair care appliance  100 . The attachments can be included in an accessory kit provided with or separately from the hair care appliance  100 .  FIGS.  38 - 68    illustrate various exemplary embodiments of attachments for use with the hair care appliance  100 , however a person skilled in the art will appreciate that any attachment known in the art can be used with the appliance  100 . 
       FIG.  38    illustrates a round brush attachment  3800  having include an inlet  3805  at which a fluid flow can be received from the hair care appliance described herein. The round brush attachment  3800  can also include a cover  3810  with a plurality of holes  3815  arranged in the cover  3810 . In some embodiments, the holes  3815  can be filled with brush bristles. The round brush attachment  3800  can also include an end cap  3820  and a base  3825 . The end cap  3820  can include one or more release mechanisms  3830  configured to release latching mechanisms disposed within the round brush attachment  3800  from engagement with features of the attachment mating assembly  700  described in relation to  FIGS.  35 - 37   . 
     As shown in  FIG.  39   , the round brush attachment  3800  can be sleeved over the body  120  of the hair care appliance  100 . The brush attachment  3800  (as well as embodiments of other attachments described herein) can be sleeved over the body  120  so as to cover the rotational hinge joint  300 . In this way, rotation of the attachment relative to the body  120  can be reduced. The fluid flow provided at the outlet  120  of the body can pass into the end cap  3820  via the fluid flow path P (shown via dashed lines) and out via an annular shaped outlet  3915  arranged on an inferior surface of the end cap  3820 . The arrangement of the fluid flow path  3910  can advantageously direct a greater volume of fluid down the surface of the round brush attachment  3800  instead of outward away from the surface. Additionally, the arrangement of the fluid flow path  3910  is such that the fluid flow changes directions from a first direction within the round brush attachment  3800  to a second, opposite direction outside of the round brush attachment (e.g., down the exterior surface of the round brush attachment  3800 ). Redirecting the fluid flow path at the outlet  3915  in an opposite direction as it entered the round brush attachment  3800  can create an fluid curtain effect down the exterior surface of the round brush attachment  3800 . This arrangement of the fluid flow path  3910  does not move hair way from the surface off the brush attachment during use. In some embodiments, a hand guard can be provided at the base  3825  of the round brush attachment  3800 . The hand guard can prevent the fluid of the fluid flow path  3910  from contacting a user&#39;s hand as it travels down the exterior surface of the round brush attachment  3800 . 
     As shown in  FIG.  40   , the attachment mating assembly  4000  can be positioned between the end cap  3820  and an attachment frame  4005 . The attachment frame  4005  can form the body of the round brush attachment  3800  and can be sleeved over the outlet end of the body of the hair care appliance described herein. The attachment mating assembly  4000  can include one or more release mechanisms  3830  coupled to either side of a mating assembly plate  4015 . The release mechanisms  3830  can be configured to release latching mechanisms  4020  from engagement with the attachment mating assembly  700  described in relation to the hair care appliance as shown in  FIGS.  35 - 37   . For example, the latching mechanisms  4020  can include hook-shaped features configured to engage with the engagement shelf  712  shown in  FIG.  37   . 
     As shown in  FIG.  41   , the end cap  3820  shown in  FIGS.  38 - 40    has been removed for clarity. The release mechanisms  3830  can be arranged on an upper surface of the mating assembly plate  4015  and the latching mechanisms  4020  can be arranged on a bottom surface of the mating assembly plate  4015 . Actuating the release mechanisms  3830  by pushing them toward the center of the round brush attachment  3800  will cause the latching mechanisms  4020  to also move toward the center of the round brush attachment. As a result, the hook-shaped engagement features on the latching mechanisms  4020  will move free of the engagement shelf  712  of the attachment mating assembly  700  in the body of the hair care appliance so that the attachment  3800  can be removed from the body of the hair care appliance. Although described in relation to the round brush attachment, in some embodiments, one or more of the attachment mating assemblies  4000  can be included on any of the attachments described herein. 
     As shown in  FIG.  42   , the round brush attachment  3800  can include a plurality of protrusions  4205  protruding downward from an upper interior surface of the attachment frame  4005 . In some embodiments, the protrusions  4205  can be configured on an engagement plate arranged between the attachment frame  4005  and the mating assembly plate  4015 . In some embodiments, the protrusions can be formed on the mounting assembly plate  4015 . The protrusions  4205  can engage with the recesses  704  of the attachment mating assembly  700  shown in  FIGS.  35 - 37    and configured in the body of the hair care appliance  100  when the attachment is coupled to the hair care appliance. The protrusions  4205  when engaged within the recesses  704  of the attachment mating assembly  700  can advantageously limit rotation of the attachment relative to the body of the hair care appliance  100 . 
     As further shown in  FIG.  42   , the round brush attachment  3800  can include a plurality of ribs  4210  extending longitudinally along an inner surface of the attachment frame  4005 . The ribs  4210  can be configured and spaced so as to engage with the protrusions  340   a ,  340   b  configured on the body frames  126   a ,  126   b  and protruding through the body housing  124  as shown in  FIGS.  33 - 34   . When the round brush attachment  3800  is sleeved over the body housing  124  the ribs  4210  can engage with the protrusions  340   a ,  340   b  to advantageously limit rotation of the round brush attachment  3800  relative to the body of the hair care appliance described herein. 
     Although the configuration of the protrusions  4205  and the ribs  4210  are described in relation to the round brush attachment  3800 , any attachment described herein can include a configuration of the protrusions  4205  and/or the ribs  4210  without limit. 
       FIG.  43    illustrates a curling attachment  4300  that can include an inlet  4305  fluidically coupled to a body  4114   a . The inlet  4305  can couple with the outlet end of the hair care appliance  100  such that fluid expelled from the hair care appliance  100  via the outlet  122  enters the curling attachment  4300  at the inlet  4305 . A spindle  4114   b  can be configured in the body  4114   a  and can be coupled to one or more wheels  4320 . The wheels  4320  can allow a user to manually rotate the spindle  4114   b  to curl hair. A high velocity air slot  4325  can be provided in the top of the body  4114   a.    
     As shown in  FIG.  44   , a fluid flow is illustrated by a plurality of flow lines extending between the inlet  4305  and the outlet  4330 . Fluid flowing into the inlet  4305  is provided to a concentrating chamber  4335  before being directed to a curling chamber  4340  via a conduit  4345 . The user can place their hair near the high velocity air slot  4325  at the top of the tool. The high velocity air can entrain the hair and cause it to wrap around the spindle  4114   b . After leaving the hair to heat for 5-10 seconds, the user can then use the blow out feature  402  shown in the user interface  401  described in relation to  FIG.  20    to help set the style. The hair is then pulled out of the curling attachment  4300 . The spindle  4114   b  should freely rotate to prevent any binding. 
       FIG.  45    illustrates a different embodiment of a curling attachment. The curling attachment  4500  shown in  FIG.  45    can include an inlet  4505  at which a fluid flow from the hair care appliance  100  can be received. The inlet  4505  can be fluidically coupled to a concentrating body  4510 . The concentrating chamber  4510  can fluidically couple to a curling chamber  4515 . The curling chamber  4515  can include a spindle  4520  and an outlet  4525 . In some embodiments, the spindle  4520  can have a tapered shape. The outlet  4252  can include a plurality of holes for the fluid flow entering the inlet  4505  to exhaust from the curling attachment  4505 . The curling attachment  4500  can also include an opening  4530  into which a user can provide hair to be curled around the spindle  4520 . 
       FIG.  46    illustrates another embodiment of a curling attachment  4600  having an inlet  4605  at which a fluid flow can be received from the hair care appliance  100 . The fluid flow can enter a concentrating chamber  4610  and be provided to a curling chamber  4615 . The curling chamber can be formed in a housing  4620  that includes a plurality of openings  4625  to exhaust the fluid flow from the curling attachment  4600 . The curling attachment  4600  can include a spindle  4630  within the housing  4620 . In some embodiments, the spindle  4630  can have a tapered shape on its length. Hair can be provided into the opening  4635  and can be curled around the spindle  4630 . 
     In another embodiment, shown in  FIG.  47   , a curling attachment is provided and includes a plate  4640  coupled to an end of the concentrating chamber  4610  and the curling chamber  4615 . The spindle  4630  can rotate relative to the plate  4630 . The curling chamber  4615  can include an open end  4645  at which curled hair can be removed from the spindle  4630 . As shown in  FIG.  48   , the spindle  4630  can extend from the plate  4640  into the curling chamber  4615 . As shown in  FIG.  49   , uncurled hair  4650  can be provided into the opening  4635  and can be drawn into the opening as a result of the fluid flow provided to the inlet  4605  via the hair care appliance attached to the curling attachment  4600 . As the fluid flow passes through the curling attachment  4600 , the hair  4650  is drawn into the curling chamber  4615  and wraps around the spindle  4630  and can be curled. The curled hair  4655  can be removed from the curling chamber  4615  at the open end  4645 . 
       FIG.  50    illustrates a barrel curling attachment  5000  that can be configured for use with the hair care appliance  100 . The barrel curling attachment  5000  can include an inlet  5005  and a barrel  5010 . The barrel  5010  can include a plurality of plates  5015 , such as plates  5015 A and  5015 B. The plates  5015  can be configured to expand away from a central longitudinal axis of the barrel  5010 . The fluid flow path can be along the central longitudinal axis of the barrel  5010 . A scroll assembly  5020  can be arranged at the outlet end  5025  and the inlet end  5030 . The scroll assembly  5050  can enable the plates  5015  to expand outward radially in order to expand the diameter of the barrel  5020 . In this way, hair can be curled to different curl sizes based on a setting of the scroll  5020 . The scroll assemblies  5020  can be individually set to different sizes so that the barrel is tapered from the outlet end  5025  to the inlet end  5030 . The barrel curling apparatus  5000  can include a scroll assembly frame  5035  to which the scroll assembly  5020  can be mounted. 
     As shown in  FIG.  51   , the scroll assembly  5020  can be in an initial configuration corresponding to an unexpanded arrangement of the plates  5015 . The scroll assembly  5020  can include a housing  5040  and one or more attachment tabs  5045  configured to couple the housing  5040  to the scroll assembly frame  5035 . A scroll plate  5050  can be arranged within the housing  5040  and can include an adjustment tab  5055  thereon. A user can rotate the adjustment tab  5055  to cause the plate  5050  to rotate within the housing  5040 . As the user rotates the adjustment tab  5055  (and thus rotating the plate  5050 ), extension elements  5060  can radially extend outward to move the plates  5015  away from the central longitudinal axis of the barrel curling attachment  5000 . 
     As shown in  FIG.  52   , the user has rotated the adjustment tab  5055  to a position opposite the position associated with the initial configuration shown in  FIG.  51   . Thus, the scroll assembly  5020  of  FIG.  52    is shown in an expanded configuration. Rotation of the adjustment tab  5055  can cause the scroll plate  5050  to rotate and drive the extension elements  5060  radially outward. As a result, the plates  5015  are also extended radially outward. In this way, the outer diameter of the barrel curling attachment  5000  can be configurable by a user to allow for styling hair with a variety of curl sizes. 
       FIG.  53    illustrates an embodiment of a wrapping barrel curling attachment  5300  that can be configured with a rotating mechanism  5305  within a housing  5310 . The wrapping barrel curling attachment  5300  can be configured to wrap hair into a coil so that the hair can be curled repeatedly. A fluid flow passage  5315  can extend from an inlet  5320  provided in an inlet housing  5340  of the wrapping barrel curling attachment  5300  through a flow passage chamber  5325  of a flow passage housing  5330  and to an exhaust  5335  configured on a side of the housing  5310 .  FIG.  54    is an image showing the wrapping barrel curling attachment  5300  of  FIG.  53   . 
       FIG.  55    illustrates an embodiment of a round brush attachment  5500  that can include a plurality of plates  5505  extending between an end cap  5510  and a base  5515 . The plurality of plates  5505  can include one or more holes  5520  and one or more slots  5525  configured on respective plates  5505 . In some embodiments, brush bristles can be configured on one or more of the plates  5505 . A variety of hole sizes and arrangements can be envisioned on the plates  5505  without limit. The round brush attachment  5500  can include a fluid flow pathway therein extending from an inlet  5530  through an inner volume of the round brush attachment  5500  and out via the holes  5520  and/or the slots  5525 . 
     The plates  5505  can be arranged within the end cap  5510  and the base  5515  such that each of the plates  5505  can articulate in a rotational manner about the circumference of the round brush attachment  5500 . For example, as a user pulls the brush attachment  5500  through their hair in a first direction, the plates  5505  can rotate clockwise with respect to a central longitudinal axis extending through the round brush attachment  5500 . The plates  5505  can be parallel to the central longitudinal axis of the round brush attachment  5500 . When the user pulls the brush attachment  5500  through their hair in a second direction, opposite to the first direction, the plates can rotate counter-clockwise with respect to the central longitudinal axis of the round brush attachment  5500 . Based on the direction of rotation of the plates, the fluid flow pathway can exhaust the fluid out of the holes  5520  and/or the slots  5525 . 
     As shown in  FIG.  56 A , the round brush attachment  5500  is shown in a neutral position. In this position, outlets  5535  arranged within the fluid flow pathway are blocked from providing the fluid flow through the plates  5505 . As shown in  FIG.  56 B , when the round brush attachment  5500  is moved in a first direction the plates  5505  rotate clockwise to allow the outlets  5535  to open and the fluid flow is provided via the holes  5520 . As shown in  FIG.  56 C , when the round brush attachment  5500  is moved in a first second the plates  5505  rotate counter-clockwise to allow the outlets  5535  to open and the fluid flow is provided via the slots  5525 . 
     As shown in  FIG.  57   , the base  5515  of the round brush attachment  5500  can include an alignment feature  5540  configured to limit circumferential rotation of the plates  5505 . The alignment feature  5540  can include a retention frame  5545  configured to couple with end portions  5550  of the plate  5505  protruding through the base  5515  and into the retention frame  5545 . 
       FIG.  58    illustrates an embodiment of a diffuser  5800  that can include a body portion  5805  and a mating portion  5810 . The body portion  5805  can be an outlet end of the diffuser  5800  at which a fluid flow received via the inlet opening  5815  of the mating portion  5810  can be provided for styling of hair. The body portion  5805  can include a plurality of projections  5820  extending away from an inner surface of the body portion  5820 . One or more of the projections can include a hole  5825  for the fluid flow to exit the projection  5820 . 
     The mating portion  5810  can include one or more release mechanisms  5830 . The release mechanisms  5830  can release latching mechanisms  5835  from engagement with the engagement shelf  712  of the attachment mating assembly  700  described in relation to  FIG.  35   . Pressing the release mechanisms  5830  toward the center of the mating portion  5810  can cause the latching mechanisms  5835  to release from the engagement shelf  712 . As further shown in  FIG.  58   , the mating portion can include a plurality of detents  5840  arranged on an inner collar  5845  of the mating portion  5810 . The detents  5840  can be received within and engage with the recesses  704  of the attachment mating assembly  700  described in relation to  FIG.  35   . Once engaged, the detents  5840  can limit rotation of the diffuser  5800  relative to the body of the hair care appliance  100  described herein. 
     As shown in  FIG.  59   , the diffuser  5800  can include a flow adjustment  5850  configured to vary the fluid flow provided by the diffuser attachment  5800 . A user can vary the fluid flow by adjusting the flow adjustment  5850  within the flow adjustment track  5855 . The plurality of projections  5820  may move relative to the body portion, thereby increasing or decreasing the length of the plurality of projections  5820 . 
       FIG.  60    shows a cross-sectional view of the diffuser attachment  5800 . As shown, a disc  5860  can be profiled to have a particular shape configured to divert air toward the edges of the body portion  5805  of the diffuser  5800 . In some embodiments, the disc  5860  is suspended from the central region of the body portion  5805 . In this way, fluid flow is not directly provided into the central region of the body portion  5805  and is, instead, redirected toward the circumference of the body portion  5805  so that a more uniform fluid flow is provided via the projections  5820  and the holes  5825 ,  5865 . The disc  5860  can be coupled to an inner frame  5870  via snap fit or friction fit. The inner frame  5870  can couple with the body portion  5805 , the mating portion  5810 , and a body portion cover  5875 . The fluid flow path  5880  through the diffuser attachment  5800  can be seen in  FIG.  61   . 
       FIG.  62    illustrates an embodiment of a concentrator  6200  that can include a body portion  6205  and a mating portion  6210 . A fluid flow path can be provided between an inlet  6215  of the mating portion  6210  and an outlet  6220  of the body portion  6205 . The mating portion  6210  can include one or more attachment features  6225  which can project radially from a mating collar  6230  and can couple the concentrator  6200  with the attachment mating assembly  6300  shown in  FIG.  35 B . For example, the attachment features  6225  can be received in and secured within the slots  6114   a  and  6114   b . The body portion  6205  may rotate relative to the mating portion  6210  such that the outlet position can be set by a user. 
       FIG.  63    illustrates another embodiment of a concentrator  6300  that can include a mating portion  6305  and a body portion  6310 . A fluid flow path can extend from an inlet end  6315  to an outlet end  6320 . The fluid flow can be provided via the opening  6325 . A variety of non-limiting shapes and dimensions of the opening  6325  can be envisioned. In this embodiment, the concentrator attachment  6300  can include a flow adjustment  6330  configured to vary the fluid flow provided by the concentrator attachment  6300 . A user can vary the fluid flow by adjusting the flow adjustment  6330  within the flow adjustment track  6335 . A bottom side perspective view of the concentrator attachment  6300  is shown in  FIG.  64   . 
     As shown in  FIG.  65   , the concentrator attachment  6500  can include a mating portion  6505  and a body portion  6510 . A fluid flow path can extend through the concentrator attachment  6500  from an inlet end  6515  to an outlet end  6520 . A fluid flow can be provided via outlet end  6520 . A variety of non-limiting shapes and dimensions of the outlet end  6520  can be envisioned. As further shown in  FIG.  65   , the concentrator attachment  6500  can include a flow adjustment  6525  configured to vary the fluid flow provided by the concentrator attachment  6500 . A user can vary the fluid flow by adjusting the flow adjustment  6525  within the flow adjustment track  6530 . 
     The mating portion  6505  can include one or more release mechanisms  6535  configured to release latching mechanism  6540  from the engagement shelf  712  of the attachment mating assembly  700  included in the hair care appliance described herein and illustrated in  FIGS.  35 - 37   . The mating portion  6505  can also include a mating collar  6545  that can be inserted into the attachment mating assembly  700 . The mating collar  6545  can include one or more tab features  6550  which can engage with the engagement shelf  712  and/or slots that can be configured formed within the engagement shelf  712 . The mating collar  6545  can also include one or more ribs  6550  configured to engage with slotted portions of the engagement shelf  712 . The tab features  6545  and the ribs  6550  can limit or reduce rotation of the concentrator attachment  6500  relative to the body of the hair care appliance  100  described herein. 
       FIG.  66    illustrates an embodiment of a curling attachment  6600  that can include a mating portion  6605  and a body portion  6610 . An inlet  6615  can be provided in the mating portion  6605 . A fluid flow path can be provided between the inlet  6615  and outlets  6620 . The outlets  6620  can be provided between plates  6625  extending along the central longitudinal axis of the curling attachment  6600 . The plates  6625  can be secured between an end cap  6630  and a mating housing  6635 . The plates  6625  can be configured to rotate clockwise and counter-clockwise relative to the central longitudinal axis of the curling attachment  6600  so that hair can be curled in multiple directions. 
     As further shown in  FIG.  66   , the curling attachment  6600  can include one or more release mechanisms  6640  arranged in the mating housing  6635 . The release mechanisms  6640  can release the latching mechanisms  6645  from the engagement shelf  712  of the attachment mating assembly described in relation to  FIGS.  35 - 37   . Pressing the release mechanisms  6640  toward the mating housing  6635  will cause the latching mechanisms  6645  to release from the engagement shelf  712 . As further shown in the  FIG.  66   , the mating portion  6605  can include a mating collar  6650 . The mating collar  6650  can include a plurality of protrusions or detents  6655  which can engage with the recesses  704  of the attachment mating assembly described in relation to  FIGS.  35 - 37   . The engagement of the detents  6655  with the recesses  704  can limit or reduce rotation of the curling attachment  6600  relative to the body of the hair care appliance  100  described herein. 
       FIG.  67    shows one exemplary embodiment of a paddle brush attachment  6700  configured for use with the hair care appliance  100 . As shown in  FIG.  67   , the paddle brush attachment  6700  can include a mating portion  6705  and a body portion  6710 . A fluid flow path can extend through the paddle brush attachment  6700  from an inlet  6715  and out the holes  6720  in the body portion  6710 . In some embodiments, one or more of the holes  6720  can include brush bristles. A non-limiting arrangement of holes  6720  and brush bristles can be envisioned on the body portion  6710 . In some embodiments, the holes  6720  and brush bristles can be positioned on a single plane. In other embodiments, the holes  6720  and brush bristles may wrap around the face of the paddle brush attachment  6700 . 
     As further shown in  FIG.  67   , the mating portion  6705  can include one or more release mechanisms  6725 . The release mechanisms  6725  can release the latching mechanisms  6730  from the engagement shelf  712  of the attachment mating assembly described in relation to  FIGS.  35 - 37   . Pressing the release mechanisms  6725  toward a central longitudinal axis extending through the paddle brush attachment  6700  will cause the latching mechanisms  6730  to release from the engagement shelf  712 . As further shown in the  FIG.  67   , the mating portion  6705  can include a mating collar  6735 . The mating collar  6735  can include a plurality of protrusions or detents  6740  which can engage with the recesses  704  of the attachment mating assembly described in relation to  FIGS.  35 - 37   . The engagement of the detents  6740  with the recesses  704  can limit or reduce rotation of the paddle brush attachment  6700  relative to the body of the hair care appliance  100  described herein. 
       FIG.  78    illustrates an embodiment of a diffuser  7800  configured for use with the attachment mating assembly  7200  of  FIG.  72   . The illustrated diffuser  7800  includes a body portion  7805  and a mating portion  7820 . The mating portion  7280  can correspond to the attachment mating portion  7600  described in relation to  FIGS.  76 A- 76 B . The body portion  7805  can be an outlet end of the diffuser  7800  at which a fluid flow received through opening  7825  of the mating portion  7820  can be provided for hair styling. The body portion  7805  can include a plurality of projections  7810  extending away from an inner surface of the body portion  7805 . One or more of the projections  7810  can include a hole  7815  for the fluid flow to exit the projection  7810 . 
     The mating portion  7820  can include a mating collar  7830  configured with one or more slots  7835 . The slots  7835  can correspond to the slots  7610  described in relation to the attachment mating portion  7600  shown and described in  FIGS.  76 A- 76 B . The slots  7835  can include an opening  7840  and a receiving end  7845 . The protrusions  7210  of the attachment mating assembly  7200  can be inserted into the openings  7840  of the slots  7835  and can travel to the receiving end  7845  as the user rotates the attachment onto the outlet end  122  of the body housing  124 . When the protrusions  7210  have reached the receiving end  7845 , the user can release the latch  7220  causing the tab  7280  to travel toward the outlet end  122  and to become positioned within the opening  7840  and the slot  7835 . In this way, the tab  7820  can fill a portion of the slot  7835  such that the protrusion  7210  is blocked from rotating away from or out of the receiving end  7845 . As a result, the attachment can be secured to the body housing  124  and rotation of the attachment relative to the body housing is significantly reduced or eliminated. Retracting the latch  7220  can cause the tab  7280  to travel out of the slot  7835  and as the user rotates the attachment for removal from the body housing  124 , the protrusions  7210  can travel from the receiving end  7845  to the opening  7840  uncoupling the attachment from the body housing  124  of the hair care appliance  100 . The attachment mating portion  7220  can be configured on any of the attachments described herein and is specifically shown in regard to embodiments of attachments shown in  FIGS.  78 - 84 B . 
     The diffuser  7800  can also include a flow adjustment  7850  configured to vary the fluid flow provided by the diffuser attachment  7800  as shown in  FIG.  79   . A user can vary the fluid flow by adjusting the flow adjustment  7850  within the flow adjustment track  7855 . 
       FIG.  80    shows a cross-sectional view of the diffuser attachment  7800 . As shown, a baffle  7870  can be configured to divert air toward the edges of the body portion  7805  of the diffuser  7800 . In some embodiments, the baffle  7870  can be disc shaped. In some embodiments, the baffle  7870  is suspended from the central region of the body portion  7805 . In this way, fluid flow is not directly provided into the central region of the body portion  7805  and is, instead, redirected toward the circumference of the body portion  7805  so that a more uniform fluid flow is provided via the projections  7810  and the holes  7815 ,  7865 . The baffle  7870  can be coupled to an extension element  7875  protruding from the lower surface of the body surface cover  7865 . In this way, the baffle  7870  can be suspended from the lower surface of the body surface cover  7865 . In some embodiments, the baffle  7870  can include holes therein as inlets or outlets for the air flow. In some embodiments, the baffle  7870  may not include any holes therein. The projections  7810  can be coupled via a frame  7880  provided within the body portion  7805 . The frame  7880  can be formed as a lattice or matrix structure with openings  7885  therein for the fluid flow path to travel through the frame  7880 . The fluid flow path  7890  through the diffuser attachment  7800  can be seen in  FIG.  81   . 
       FIG.  82 A  shows another exemplary embodiment of a concentrator attachment configured for use with a hair care appliance  100  including the attachment mating assembly  7200  of  FIG.  72   . A fluid flow path can extend from an inlet end  8205  to an outlet end  8210 . The fluid flow can be provided via the opening  8210 . A variety of non-limiting shapes and dimensions of the opening  8210  can be envisioned. In this embodiment, the concentrator attachment  8200  can include a flow adjustment  8220  configured to vary the fluid flow provided by the concentrator attachment  8200 . A user can vary the fluid flow by adjusting the flow adjustment  8220  within the flow adjustment track  8225 . A bottom perspective view of the concentrator attachment  8200  is shown in  FIG.  82 B . A side perspective view of the concentrator attachment  8200  is shown in  FIG.  82 C . As shown in  FIG.  82 C , the outlet end  8210  can include an opening  8230 . A variety of non-limiting shapes and dimensions of the opening  8230  can be envisioned. 
       FIG.  83 A  shows another exemplary embodiment of a curling attachment  8300  configured for use with a hair care appliance  100  including the attachment mating assembly  7200  shown and described in relation to  FIG.  72   . The curling attachment  8300  can include a mating portion  7820  and a body portion  8305 . An inlet  8315  can be provided in the mating portion  7820 . A fluid flow path can be provided between the inlet  8315  and outlets  8320 . The outlets  8320  can be provided between plates  8310  extending along the central longitudinal axis of the curling attachment  8300 . The plates  8310  can be secured between an end cap  8325  and the mating portion  7820 . The plates  8310  can be configured to rotate clockwise and counter-clockwise relative to the central longitudinal axis of the curling attachment  8300  so that hair can be curled in multiple directions. 
     As shown in  FIG.  83 B , some of plates  8310  have been removed to illustrate an internal frame  8330  of the curling attachment  8300 . The frame  8330  can include a plurality of outlets  8335  formed between frame elements of the frame  8330 . The fluid flow path can be received via the inlet  8315 , pass inside of the frame  8330 , through the openings  8335  and out of the curling attachment  8300  via the outlets  8320 . A variety of non-limiting shapes and dimensions of the frame  8330  and the openings  8335  formed by the frame elements can be envisioned. 
       FIG.  84 A  shows another exemplary embodiment of a round brush attachment  8400  configured for use with a hair care appliance  100  including the attachment mating assembly  7200  shown and described in relation to  FIG.  72   . The round brush attachment  8400  can receive a fluid flow via the inlet  8405  from the hair care appliance  100 . The round brush attachment  8400  can include a cover  8410  with a plurality of outlets, such as holes  8415  and slots  8420 , formed in the cover  8410  through which the fluid flow can pass. The round brush attachment  8400  can include bristles  8425  protruding through the holes  8415 . In some embodiments, one or more bristles  8425  can protrude through a hole  8415 . The cover  8410  can be positioned between an end cap  8430  and the mating portion  7820 . 
     The fluid flow received via the inlet  8405  can be diffused via a diffuser plate  8435  in including holes  8440  as shown in  FIG.  84 B  illustrating a cross-sectional perspective view of the round brush attachment  8400  of  FIG.  84 A . A non-limiting variety of shapes, dimensions, and patterns of the holes  8440  can be envisioned. The inner body  8450  can include slots  8455  in a non-limiting variety of shapes, dimensions, and patterns. The fluid flow can be advantageously directed to the holes  8415  and slots  8420 ,  8455  via a baffle  8445 . The baffle  8445  can be positioned within an inner body  8450  and can be coupled to or integrated with the end cap  8430 . The inner body  8450  can be coupled to the mating portion  7820  and to the end cap  8430 . A gap  8455  can be formed between an exterior surface of the inner body  8450  and an inner surface of the cover  8410 . The gap  8455  can be dimensioned to advantageously provide the fluid flow through the holes  8415  and the slots  8420 . In some embodiments, the baffle  8445  is a hollow structure that does not include an inlet or an outlet. In some embodiments, the baffle  8445  can be a solid structure that does not include an inlet or an outlet. In some embodiments, the baffle  8445  can be a hollow structure or a solid structure and can include at least one inlet and at least one outlet. 
       FIG.  85 A  shows another exemplary embodiment of a paddle brush attachment  8500  configured for use with a hair care appliance  100  including the attachment mating assembly  7200  of  FIG.  72   . The paddle brush attachment  8500  can include the mating portion  7820  and an inlet  8505 . A cover  8510  can be coupled between the mating portion  7820  and an end cap  8515 . The cover  8510  can include holes  8520  and slots  8525  configured as outlets of the paddle brush attachment  8500 . A variety of non-limiting shapes, dimensions, and patterns of holes  8520  and slots  8525  can be envisioned. A plurality of bristles  8530  can extend through the cover  8510  via the holes  8520 . A fluid flow path can extend through the paddle brush attachment  8500  from the inlet  8505  and out the holes  8520  and the slots  8525 . In some embodiments, the holes  8520  and brush bristles  8530  can be positioned on a single plane. In other embodiments, the holes  8520  and brush bristles  8530  may wrap around the face of the paddle brush attachment  8500 . 
     The fluid flow path through the paddle brush attachment  8500  can be directed toward the face and sides of paddle brush attachment by a diverter  8540  shown in  FIG.  85 B  illustrating a cross-sectional perspective view of the paddle brush attachment  8500 . The diverter  8540  can be positioned within the paddle brush attachment between the cover  8510  and a housing  8535 . The diverter  8540  can include a plurality of curved vanes  8545  to direct the fluid flow within the paddle brush attachment  8500 . As shown in  FIG.  86   , the diverter  8540  can include a frame  8550  extending between a base  8555  and a head  8560 . The base  8555  can include an opening  8565  in correspondence with the inlet  8505 . A variety of non-limiting shapes, numbers, and dimensions of the frame  8550  and the vanes  8545  can be envisioned to advantageously divert the fluid flow received at the opening  8555  along the frame  8550  and toward the holes  8520  and slots  8525  in the cover  8510 . 
     The attachment mating mechanisms and assemblies of the improved hair care appliance described herein produce a number of advantages. For example, the attachment can be secured to the hair care appliance using a dual-mating technique. Firstly, attachment mating mechanisms at the outlet of the body housing (e.g., the hook-shaped features formed as segmented concentric rings or protrusions of the mating collar) can interface with mating mechanisms of an attachment (e.g., longitudinally oriented ridges or slots) to couple to and reduce rotation of the attachment and the body. An attachment actuator assembly can eliminate rotation of the attachment relative to the body housing by actuating to insert a tab into a slot a slot of the mating portion of the attachment. Secondly, an attachment can be configured to extend over the outlet in a sleeved configuration. Additionally, the sleeve can enable a more compact design of the hair care appliance when an attachment is secured to the outlet and can enhance the user experience as a result of the compact design. 
     Certain exemplary embodiments have been described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the systems, devices, and methods disclosed herein. One or more examples of these embodiments have been illustrated in the accompanying drawings. Those skilled in the art will understand that the systems, devices, and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention. Further, in the present disclosure, like-named components of the embodiments generally have similar features, and thus within a particular embodiment each feature of each like-named component is not necessarily fully elaborated upon. 
     Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as “about,” “approximately,” and “substantially,” are not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Here and throughout the specification and claims, range limitations may be combined and/or interchanged, such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise. 
     One skilled in the art will appreciate further features and advantages of the invention based on the above-described embodiments. Accordingly, the present application is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. All publications and references cited herein are expressly incorporated by reference in their entirety.