CN107224077B

CN107224077B - Accessory for hand-held appliance

Info

Publication number: CN107224077B
Application number: CN201710179806.5A
Authority: CN
Inventors: R.A.马森; E.V.卡森
Original assignee: Dyson Technology Ltd
Current assignee: Dyson Technology Ltd
Priority date: 2016-03-24
Filing date: 2017-03-23
Publication date: 2021-09-03
Anticipated expiration: 2037-03-23
Also published as: US20170273423A1; RU2694926C1; JP6511080B2; JP2017170149A; GB2548812A; GB2548812B; KR20180121984A; CN107224077A; WO2017163002A1; GB201605016D0; CN207023592U; AU2017236398B2; AU2017236398A1; EP3432755A1

Abstract

An attachment for a hair care appliance is disclosed, the attachment comprising a body having a fluid inlet, a fluid outlet, a fluid flow path extending between the fluid inlet and the fluid outlet, a first fin and a second fin for directing fluid in the fluid flow path towards the fluid outlet, wherein the body comprises at least two extension panels and the fluid outlet comprises a slot defined by an overlap between the at least two extension panels, wherein the first fin and the second fin are curved and positioned within the overlap between the at least two extension panels, wherein the first fin and the second fin are curved in opposite directions. The fluid inlet may comprise a first cross-sectional area, the body comprising an outer wall, the outer wall of the body comprising a second cross-sectional area, wherein the second cross-sectional area is greater than the first cross-sectional area.

Description

Accessory for hand-held appliance

Technical Field

The invention relates to an attachment for a hand-held appliance, in particular a hair care appliance such as a heating styling appliance.

Background

In conventional heated styling apparatus, air is drawn into the inlet by the fan unit and directed towards the hair by the head or attachment. Depending on the desired styling, the air may or may not be heated. The head or attachment typically includes bristles over which hair is wrapped and held for styling. This air blows out of the attachment generally normal to its surface. When styling hair is curly, it can be difficult to unwrap the hair from the bristles and the hair can become tangled.

When styling hair is curly hair, it is also known to use curling tongs in which a heated barrel can be brought to a higher temperature before the hair is wound around the barrel, and then the clips are held by the barrel for a period of time. Repeated use of such curling irons at high temperatures may damage the hair.

Disclosure of Invention

According to a first aspect, the present invention provides a hair care appliance comprising a body having a fluid inlet, a fluid outlet, a fluid flow path extending between the fluid inlet and the fluid outlet and at least one fin for directing fluid in the fluid flow path towards the fluid outlet, wherein the body comprises at least two extension panels and the fluid outlet comprises a slot defined by an overlap between the at least two extension panels, and wherein the at least one fin is positioned within the overlap between the at least two extension panels.

It is advantageous to provide a fin on the inner surface of each plate for accurately directing the flow as it exits the attachment. In particular, a consistent air flow exiting the attachment will allow the tress of hair to be evenly attached over the length of the bucket.

Preferably, the body is elongate and extends along an axis. In a preferred embodiment, the elongate body has a first end and a second end, and the fluid inlet is at the first end.

Preferably, the fluid outlet extends along the axis between the first end and the second end.

In a preferred embodiment, the at least one fin is airfoil-shaped (aerofoil). This shape is advantageous because it reduces turbulence.

Preferably, the at least one fin directs fluid flow in the fluid flow path from a first direction to a second direction. In a preferred embodiment, the first direction is parallel to the axis of the body. Preferably, the second direction is from 85 ° to 95 ° relative to the axis.

In a preferred embodiment, the at least one fin comprises a plurality of fins extending from the first end of the body towards the second end of the body.

Preferably, the plurality of fins are irregularly spaced along the body. In a preferred embodiment, the plurality of fins are progressively closer together towards the second end assembly.

Preferably, the plurality of vanes are angled with respect to the axis of the body. In a preferred embodiment, at least some of the plurality of fins are angled differently than adjacent fins. Preferably, the angle of the plurality of vanes about the axis increases towards the second end.

It is an advantage to provide a variation of the angle of the fins within the overlapping portion, wherein the angle of the fins is dependent on the position of the fins along the length of the attachment in order to optimize the airflow attachment.

In a preferred embodiment, the plurality of fins vary in size between the first end and the second end. Preferably, the plurality of fins are tapered towards the second end of the body. .

In a preferred embodiment, each of the plurality of fins has the same profile.

Preferably, the slot is curved about the axis of the body. The advantage is the combination of a twisted spiral form of each plate which provides a spiral shaped fluid outlet slot and internal fins to direct fluid flow out of the attachment as this enhances the attachment of air to the surface of the attachment.

In a preferred embodiment, the overlap between the at least one tab and the at least two extension panels is of substantially the same length.

Preferably, one of the at least one fin has a fluid directing function as well as a structural function.

In a preferred embodiment, each extension plate is formed by a post and a plate.

Preferably, the slot is formed by a post and a plate from an adjacent extension plate.

According to a second aspect, the present invention provides an attachment for a hair care appliance, the attachment comprising an elongate body having a first end and a second end, a fluid inlet at the first end, a fluid outlet and a fluid flow path extending between the fluid inlet and the fluid outlet, wherein a cooling tip is provided adjacent the second end of the elongate body and spaced from the second end of the elongate body.

The gap between the underside of the cooling tip and the adjacent end of the elongate body advantageously minimizes heat transfer to the cooling tip and also has the advantage of allowing manufacturing tolerances between the component sections.

Preferably, an air gap is provided between the cooling tip and the second end of the elongate body.

In a preferred embodiment, the cooling tip includes an annular flange extending around the second end of the elongated body. Preferably, the elongate body has an outer wall. In a preferred embodiment, the annular flange is spaced from the outer wall.

In a preferred embodiment, the cooling tip includes a handle extending from the flange.

Preferably, the handle is cylindrical. In a preferred embodiment, the handle is hollow. Having a hollow handle on the cooling tip advantageously provides further insulation by air.

Preferably, the outer wall is formed by at least two plates (which extend from the first end to the second end).

In a preferred embodiment, the fluid outlet comprises a slot, wherein the slot extends between the at least two plates. Preferably, the slot is curved. In a preferred embodiment, the fluid outlet comprises more than one slot.

According to a third aspect, the present invention provides an accessory for a hair care appliance, the accessory comprising a first subassembly and a second subassembly, wherein the first subassembly comprises a cage to which components of the second subassembly are mounted.

Preferably, the first sub-assembly is formed from a plurality of spaced apart posts.

In a preferred embodiment, the second subassembly comprises a plurality of plates.

Preferably, each of the plurality of spaced apart posts includes a longitudinal flange (which extends from the first end to the second end). In a preferred embodiment, each of the plurality of plates includes a cooperating longitudinal flange.

Preferably, an equal number of plates and columns are provided.

In a preferred embodiment, the first subassembly includes at least one structural fin (which extends between a pair of adjacent posts).

Preferably, the second subassembly comprises a plurality of panels, and each of the plurality of panels comprises a notch for receiving the at least one structural tab.

In a preferred embodiment, the accessory includes an elongated body formed from a plurality of spaced apart posts and a plurality of plates. Preferably, the elongate body comprises a first end and a second end.

In a preferred embodiment, each of the plurality of plates and the plurality of spaced apart posts is provided with one of a cooperating pair of protrusions and recesses at the first end of the elongated body. Preferably, each of the plurality of plates and the plurality of spaced apart posts is provided with the other of the cooperating pair of projections and recesses at the second end of the elongate body.

In a preferred embodiment, the plurality of plates are welded to the first subassembly as the plurality of plates are attached to the first subassembly.

Preferably, each of the plurality of spaced apart posts includes a longitudinal flange extending from a first end to a second end, and each of the plurality of plates includes a cooperating longitudinal flange and the flanges are welded together.

In a preferred embodiment, at a distal end of each of the plurality of spaced apart posts and each of the plurality of plates relative to the longitudinal flange and the cooperating longitudinal flange is a slot, and the slot forms a portion of the fluid outlet of the fitment.

Preferably, the plurality of tabs are disposed within the slots. In a preferred embodiment, the plurality of tabs are used to maintain a slot gap between the post and the plate. Preferably, a plurality of fins are used to divert fluid exiting the trough.

In a preferred embodiment, at the first end of the elongated body, a connection ring is provided for connecting the accessory to the hair care appliance.

According to a fourth aspect, the present invention provides an attachment for a hair care appliance, the attachment comprising an elongate body having a first end and a second end, a fluid inlet at the first end, a fluid outlet and a fluid flow path extending between the fluid inlet and the fluid outlet, wherein a collar is provided at the first end and the collar extends around the elongate body.

It is an advantage to provide a square protrusion or collar at the first end of the attachment for avoiding entrainment of air near the hot air styling apparatus and for avoiding hair from wrapping along the hot air styling apparatus.

Preferably, the fluid outlet extends from adjacent the collar towards the second end of the elongate body. In a preferred embodiment, the collar extends outwardly from the elongate body. Preferably, the elongate body extends along an axis and the collar is substantially perpendicular to the axis of the elongate body. In a preferred embodiment, the elongated body extends radially outward from the axis and the collar extends further from the axis than the elongated body. Preferably, the collar extends radially around the elongate body.

In a preferred embodiment, the fluid outlet comprises at least one slot extending along the elongate body.

Preferably, the outer wall is formed from at least two extension panels and the at least one slot extends between the at least two extension panels.

In a preferred embodiment, the elongated body extends along an axis and the at least one slot is curved about the axis. Preferably, the at least one groove is helical.

According to a fifth aspect, the present invention provides an attachment for a hair care appliance, the attachment comprising an elongate body having a first end and a second end, a fluid inlet at the first end, a fluid outlet and a fluid flow path extending between the fluid inlet and the fluid outlet, wherein the diameter at the first end is greater than the diameter at the second end and the fluid outlet extends from the first end to the second end.

Preferably, the elongate body converges from the first end towards the second end.

In a preferred embodiment, the diameter of the elongated body decreases gradually from the first end. Preferably, the reduction in diameter extends along a portion of the elongate body. In a preferred embodiment, the diameter gradually transitions from the diameter at the first end to the diameter at the second end.

Preferably, the elongate body comprises an extension plate extending from the first end to the second end. In a preferred embodiment, the extension plate has a thickness, and the thickness of the plate is substantially uniform along the body.

Preferably, any change in diameter along the length of the elongate body is both an internal change and an external change.

In a preferred embodiment, the elongated body flares toward the first end. Advantageously, the flared profile of the first end of the attachment reduces turbulence and thereby assists in the initial attachment of the ends of the hair bundle. Further, hair is entangled from the second end of the attachment toward the air inflow port end.

Preferably, the elongate body extends along an axis and has a substantially constant diameter along the axis from the second end towards the first end.

In a preferred embodiment, the fluid outlet comprises at least one slot extending along the elongate body. Preferably, the elongate body extends along an axis and the at least one slot is curved about the axis. In a preferred embodiment, the at least one groove is helical.

Advantageously, the attachment of the present invention can be provided in different sizes to enable several sizes of curls to be styled. Further, either of a clockwise spiral airflow outlet slot or a counter-clockwise spiral airflow outlet slot may be utilized. The direction of the overlapping portion of the slots determines the direction of the curl.

According to a sixth aspect, the present invention provides an attachment for a hair care appliance, the attachment comprising a body having a fluid inlet, a fluid outlet, a fluid flow path extending between the fluid inlet and the fluid outlet, a first fin and a second fin for directing fluid in the fluid flow path towards the fluid outlet, wherein the body comprises at least two extension panels and the fluid outlet comprises a slot defined by an overlap between the at least two extension panels, wherein the first fin and the second fin are curved and are positioned within the overlap between the at least two extension panels, wherein the first fin and the second fin are curved in opposite directions.

Preferably, the fluid inlet comprises a first cross-sectional area, the body comprises an outer wall, and the outer wall of the body comprises a second cross-sectional area, wherein the second cross-sectional area is greater than the first cross-sectional area.

In a preferred embodiment, the fluid inlet has a diameter d_fThe accessory having a diameter d₂Wherein d is₂Greater than d_f。

Preferably, the body is elongate and extends along an axis. In a preferred embodiment, the body has a first end and a second end, and the fluid inlet is at the first end.

Preferably, the first fin is adjacent the fluid inlet. In a preferred embodiment, the first fin has a convex surface, and the convex surface faces the fluid inlet.

Preferably, the second fin has a concave surface and the concave surface faces the fluid inlet.

In a preferred embodiment, the first and second vanes are airfoil shaped.

In a preferred embodiment, the second tab includes a plurality of tabs spaced along the extension panel. Preferably, the plurality of fins are irregularly spaced along the extension plate. In a preferred embodiment, the plurality of fins are angled relative to the axis of the body. Preferably, at least some of the plurality of fins are angled differently than adjacent fins. In a preferred embodiment, the angle of the plurality of vanes about the axis increases towards the second end. Preferably, the plurality of tabs vary in size along the extension panel. In a preferred embodiment, each of the plurality of fins has the same profile. Preferably, the at least one tab is substantially the same length as the overlap between the at least two extension panels.

In a preferred embodiment, the slot is curved about the axis of the body.

Preferably, each extension panel is formed from a post and a plate.

In a preferred embodiment, the slot is formed by a post and plate from an adjacent extension plate.

Preferably, the accessory further comprises at least one structural fin. In a preferred embodiment, the at least one structural fin is connected between a post and an adjacent post. Preferably, the at least one structural fin is connected between the post and the plate.

Advantageously, the protrusions on the leading edge of the inner surface of the plate provide enhanced adhesion of the air flow to the outer surface of the accessory, in particular a larger diameter accessory (e.g. 40 mm).

According to another aspect, the present invention provides an attachment for a hair care appliance comprising a body having a fluid inlet, a fluid outlet and a fluid flow path extending between the fluid inlet and the fluid outlet, wherein the fluid outlet comprises a slot defined by an overlap between a radially inner extending plate and a radially outer extending plate.

Preferably, the radially inner extending plate includes a radially inner surface that curves radially inwardly toward the overlapping portion.

Preferably, the radially inwardly extending plate comprises a post and a plate.

In a preferred embodiment, the radially inner surface comprises a reinforcing rib, which preferably extends radially inwardly from the column. Preferably, the strengthening rib is circular so that it provides a smooth transition of fluid flow through the attachment. The reinforcing rib extends from the inlet end of the overlap portion at least partially along the radially inner surface of the column.

Preferably, the post includes a boss positioned adjacent the inlet end of the radially inner plate. This protrusion is an expansion or local thickening of the post. Preferably, the projection is substantially hemispherical. Preferably, the projection extends from the inlet end of the column to the outlet end of the column. Alternatively, the boss extends partially along the post.

In a preferred embodiment, the reinforcing ribs, projections or bulges extend along substantially the entire length of the column.

Preferably, adjacent the fluid inlet, the strengthening rib, projection or expansion comprises a chamfer or angled face. This provides a smooth transition of the fluid flow into the attachment. Preferably, the accessory comprises an attachment ring for attachment to an appliance. In a preferred embodiment, the attachment ring defines a fluid inlet into the attachment. Preferably, adjacent the attachment ring, the reinforcing rib, projection or bulge lies in the same plane as the attachment ring. In a preferred embodiment, a stiffening rib, projection or bulge extends radially inwardly from the attachment ring to a minimum radius towards the downstream end of the attachment. Once this minimum radius is reached, the stiffening rib, boss or bulge preferably remains at a substantially constant radius relative to the longitudinal axis X-X of the attachment.

Preferably, the hair care appliance is a heated styling appliance.

Drawings

Preferred features of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of an embodiment of the present invention;

FIG. 2a is an exploded view of the accessory;

FIG. 2b is an isometric view of the first subassembly;

FIG. 2c is an exploded view of the second subassembly;

FIG. 3 is a side view of the attachment;

FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B in FIG. 3;

FIG. 6 is a cross-sectional view taken along line X-X in FIG. 3;

FIG. 7 is a top end view of the attachment;

FIG. 8 is a bottom end view of the attachment;

FIG. 9 is a front view of a single plate;

FIG. 10 is a side view of a single plate;

FIG. 11 is a perspective view of a second embodiment of the present invention;

FIG. 12 is an exploded view of the attachment of FIG. 11;

FIG. 13 is a side view of the attachment of FIG. 11;

FIG. 14 is a cross-sectional view taken along line A-A in FIG. 13;

FIG. 15 is a cross-sectional view taken along line B-B in FIG. 13;

FIG. 16 is a longitudinal cross-sectional view of the attachment of FIG. 11;

FIG. 17 is a side view of a single plate of the attachment of FIG. 11; and

fig. 18 is a side view of an example of a hot air molding apparatus to which accessories may be attached.

Detailed Description

FIG. 1 is an external view of an attachment 10 of the present invention; the attachment 10 includes a fluid inlet 20, the fluid inlet 20 being adapted to receive a flow of air from an air outlet end of a hot air molding apparatus or the like. The fluid inlet 20 is generally circular in shape to provide an air-tight sealed connection with the generally circular outlet end of the hot air molding apparatus.

The fitment 10 is substantially cylindrical and extends longitudinally from the fluid inlet 20 to a distal end 30, preferably continuing a line defined by the hot air molding apparatus. The attachment has an elongated body 12, the body 12 having a first end 14 and a second end 16. The elongated plates 40 extend from the first end 14 to the second end 16, and the elongated slots 50 disposed between adjacent plates 40 include fluid outlets for this attachment. The distal end 30 of the attachment 10 includes a cooling tip 32.

In this embodiment, the attachment 10 has a constant diameter d extending at least partially along the elongated body 12₁Smaller than the diameter d of the fluid inlet 20_f。

Fig. 2a, 2b and 2c show exploded and isometric views of a preferred embodiment of the accessory, which exposes some of the internal structure and the portion shown may also be a preferred sub-section of the assembly. Fig. 2a and 2b show a first subassembly 100 formed from a central cylindrical cage structure 60, and this is shown with six elongated support posts 62. The six elongated support posts 62 extend between a collar 64 at the fluid inlet 20 of the central cylindrical cage structure 60 and an end wall 66 at the second end 24 of the central cylindrical cage structure 60. The collar 64 extends from a connecting ring 68. The attachment ring 68 is used to attach the attachment 10 to a hot air molding apparatus or the like. The end wall 66 includes a protruding ring 26, the protruding ring 26 for attachment of the cooling tip 32 by tabs 28 radially surrounding the cooling tip 32. The fluid outlet is formed by a slot 50 extending from adjacent the collar 64 to an end wall 66 at the second end 24 of the central cylindrical cage structure 60.

The second subassembly 110 is formed from six individual plates 40 as shown in fig. 2 c. The second subassembly 110 is attached to the first subassembly 100 when the accessory is manufactured. In a preferred embodiment, each plate 40 is attached to a post 62 to form an extension plate 54 (shown in fig. 5), and this forms the elongated body 12, which extends between the collar 64 and the second end 24 of the central cylindrical cage structure 60. The elongated body 12 has a first end 14 (adjacent the collar 64) and a second end 16 (adjacent the end wall 66 of the central cylindrical cage structure 60). The elongated body 12 extends as long as the post 62, plate 40 and elongated slot 50. The collar 64 and connecting ring 68 form part of the central cylindrical cage structure 60 but are not the elongated body 12.

The collar 64 is flat and annular, extends outwardly from the elongated body and has a diameter greater than the diameters of the connecting ring 68, the elongated body 12 and the cylindrical cage structure 60. The collar 64 is generally orthogonal to the longitudinal axis X-X of the attachment, which is also the longitudinal axis of the elongated body 12.

To attach the first subassembly to the second subassembly, each plate 40 is attached to a post 62. Each post 62 has a number of formations for receiving attachment formations on the inner side of each panel 50. In particular, three structural tabs 70 extend from the leading edge 62a of each post 62 at regular intervals and are joined to the outer surface 72 of the immediately adjacent post. The inner surface of each panel 40 has three indentations 44 positioned to receive the structural tabs 70. In another embodiment, both ends of the outer surface 72 of each post include recesses 74 adapted to receive the protrusions 46 positioned at both ends of the inner surface 42 of each plate 40. Additionally, each post 62 includes a longitudinal flange 76 that extends from the leading edge 62 a. Each plate 40 has a cooperating longitudinal flange 48. In this embodiment, the cooperating longitudinal flange 48 is formed as a continuation of the three indentations 44, providing a local thinning of the plate 40. The longitudinal flange 48 of the post 62 is also an effective thinned portion of the post 62. When plate 40 is attached to post 62, extension plate 54 (visible in fig. 5) is formed, and longitudinal flanges 76 cooperate with cooperating longitudinal flanges 48 to position plate 40 with respect to post 62. In a preferred embodiment, when the plate 40 is attached to the post 62, the outer surface 72 of the post 62 continues across the outer surface 52 of the plate 40.

In a preferred embodiment, additional securing means (such as ultrasonic welding or gluing) may be utilized in addition to the attachment and positioning plate 50. The components are preferably welded along the length of the three notches 44 and flanges. This provides an air seal at the leading edge 62a of each post 62 forcing air out of the elongated slot 50.

As shown in fig. 2b and 2c, a plurality of fins 100 are located on the inner surface 42 of each plate 40. In particular, the tab 100 is positioned along the leading edge 42a, in an orientation transverse to the longitudinal axis X-X of the accessory. In a preferred embodiment, the tabs 100 are spaced along the length of the plate 40 with gaps where the locating notches 44 are located. From the first end 14 to the second end 16, the length, depth and angle of deviation from the orthogonal direction relative to the leading edge 42a of the plate 40 of the tab 100 gradually decrease.

The structural fins 70 also have the function of directing the flow. Thus, the structural fin has a structural function and a flow turning function. The structural fins 70 have a similar angle and profile as the fins 100 adjacent each structural fin 70.

The fins 100 and structural fins 70 are optimized for a drop in air pressure and a drop in air volume along the elongated body 12 from the fluid inlet 20 to the second end 16 to provide air flow out of the slot 50 (the amount and direction of which is consistent along the length of the slot 50).

Figure 3 shows a side view of the attachment. The profile of the leading edge of each plate is not parallel to the longitudinal axis X-X of the attachment. In particular, each plate is twisted about the longitudinal axis X-X of the accessory to form a helical arrangement. Preferably, the slot is bent at an angle of 45 ° from the longitudinal axis X-X of the attachment. In the present embodiment, the slot 50 is curved in a counter-clockwise direction (from the first end 14 toward the second end 16). The slot 50 is formed between adjacent overlapping

elongate plates

54, 54a, however, to form a curved slot, the plate 40 does not extend along the longitudinal axis of the attachment but is preferably curved at an angle of 45 °.

In fig. 3, the tabs 100 on the inner surface of one particular plate 50 are visible through the slot between two adjacent plates. In the preferred embodiment shown, the diameter of the elongated body 12 is greater at the first end 14 than at the second end 16. In particular, the plate is arranged to flare outwardly toward the first end 14 of the elongated body 12.

In fig. 3, a side view of the attachment shows the projections 76 regularly positioned on the connection ring 68 to enable a snap-fit connection to the fluid outlet end of the hot air molding apparatus or the like. Alternative attachment options will be apparent to the skilled person, such as a screw-fit or push-fit arrangement.

A transverse cross-sectional view through the elongate body 12 along line a-a is shown in fig. 4. This cross section shows six extension panels 54, where each extension panel 54 includes one panel 40 and one post 62, but is not cut through the structural fin 70 or the fin 100. The width of the fluid outlet path 58 between an extension plate 54 and a successive extension plate 54a is not constant. In particular, each extension panel 54 has an arcuate shaped cross-section having a radius that is smaller than the radius of the unitary elongated body 12. Thus, each fluid outlet path 58 has a minimum dimension at the associated outlet slot 50. The thickness of the extension plate 54 remains substantially constant despite the narrowing of the fluid outlet path 58 toward each slot 50. The longitudinal flange 76 and the cooperating longitudinal flange 48 are thus both about half the thickness of the plate 40 and the post 62.

The air flow exiting each slot 50 is tangential to the outer surface 54b of the elongated plate 54 and combines with the air flow exiting the other slots to form a continuous fluid path 78 around the circumference of the attachment. The air flow exiting the slot 50 is drawn to the curved surface of the attachment by the coanda effect. This in turn causes the hair present at the attachment 10 to be affected by the air flow and to wind around the cylindrical surface of the attachment 10. In particular, the end of a lock of hair present at the accessory 10 is attracted to the external surface of the accessory, the lock then wrapping around the accessory 10. Wet hair dries quickly as air is blown along the length of the hair. Advantageously, this winding process occurs without the use of bristles, and thus once the hair is dried or styled, the hair can slide off the attachment, without tangling.

The air flow exiting the slots is generally orthogonal to the slots 50, however it is preferred that the air flow be angled toward the fluid inlet 20 at an angle of about 2.5 to 4.5 °. In this example 3.5 has been used. The combination of the curved slot 50, the fin 100 and the structural fin 70 creates this angle of airflow. This causes the hair to spiral downward from the attachment towards the fluid inlet 20, which causes the curls to naturally fall off the attachment 10 when the user removes the attachment 10 from a lock of hair or closes the device.

Another transverse cross-sectional view through the elongated body 12 along line B-B in fig. 3 is shown in fig. 5. The cross-section is cut through the tab 100 on each extension panel 54. Since the position of each extension plate 54 has been rotated relative to fig. 4, the longitudinal helical nature of the fluid outlet slot can be seen. Wherein the fins 100 on the extension plate 54 contact the adjacent extension plate 54a and the air flow is restricted or stopped.

Fig. 6 shows a cross-section through the longitudinal axis of the attachment 10, thereby exposing the inner surfaces of the posts 62. The interior of the cooling tip is hollow to provide a relatively cool location for a user to touch or grasp the accessory. The spacing between the underside of the cooling tip 32 and the second end 16 of the elongated body 12 minimizes heat transfer to the cooling tip 32 and also has the advantage of allowing manufacturing tolerances between the components.

The cooling tip 32 includes a handle 34 and an annular flange 36. The handle 34 is hollow and in this embodiment is filled with air to isolate the handle 34 from the flow of hot fluid within the attachment 10. The annular flange 36 is provided with an annular gap 38 to provide an air gap 80 between the elongated body 12 and the cooling tip 32 that extends circumferentially around the annular flange 36. The elongated body 12 may be considered to have an outer wall 82 formed from a plate, with the annular flange 36 spaced from the outer wall 82. The space gap 80 is of sufficient size so that the space gap 80 continuously surrounds the annular flange 36, even when manufacturing tolerances are taken into account.

In fig. 3 and 6, the flared profile of the elongated body 12 is presented at the first end of the appendage. Such splaying does not occur in all embodiments of the present invention. Whether splaying is present is determined by the relative diameters of the attachment and the hot air molding apparatus or similar apparatus to which the attachment is attached. If the size of the attachment is smaller than the diameter of the hot air molding apparatus or similar apparatus, there is flaring to minimize turbulence and enable a change in diameter from apparatus to attachment. In particular, such splaying is included in embodiments of the elongate body having a diameter of 30 mm, but is not included in embodiments of the elongate body having a diameter of 40 mm. This flaring serves to reduce turbulence and thereby assist in the initial attachment of the end of the strand of hair to the first end of the attachment.

The elongated body 12 converges from a first end 14 toward a second end 16. The reduction in diameter extends from the first end 14 to a point Y, and the diameter of the elongate body 12 is constant from the point Y to the second end 16. The purpose of the convergence is to provide a smooth transition from the diameter at the fluid inlet 20 to the diameter at the second end 16 of the elongate body 12. Any turbulence in the air flowing into the attachment 10 is minimized, which also reduces the pressure loss of the attachment 10. This has the advantage of facilitating the end of the hair in the lock to be attached to the outer surface of the accessory.

The top view of the exemplary attachment in fig. 7 shows that the collar 64 proximate the fluid inlet of the attachment has a larger diameter than the cooling tip 32 at the distal end 30. The bottom view of the exemplary attachment in fig. 8 shows the overlapping configuration of each extension panel 54.

The collar 64 serves several functions. The collar 64 retains hair on the attachment 10 by providing a physical barrier for hair as it is wound around the attachment 10 and preventing hair from being wound around the attachment 10 (or indeed the appliance connected) beyond the collar 64. Another function is to shield the air flow around the attachment 10. The continuous fluid path 78 around the attachment 10 will entrain or draw in the air flow from outside the tank 50. This trapped air is not necessarily tangential with respect to the outer surface 54b of the extension plate 54, thereby adversely affecting the hair wrapping process. The collar 64 has a larger diameter than the first end 14 of the elongate body 12, whereby it acts as an obstacle to air being drawn across the surface of the appliance towards the attachment 10.

Fig. 9 shows a preferred embodiment of the inner surface 42 of a single plate 40 having twelve tabs 100 (which are positioned proximate the leading edge 42a of the plate 40). The fins 100 are spaced apart in two main series of five fins. Notches 44 adapted to receive the structural tabs 70 are established on the trailing edge 42b of the panel 40 at the gaps between the series of tabs. The tab 100 is positioned in an orientation generally perpendicular to the leading edge 42a of the plate 40. In a preferred embodiment, the tab 100 located near the upstream end of the appendage is positioned at an acute angle relative to the leading edge 42a of the plate 40. The preferred length of the tab 100 substantially fills the slot 50 (which is formed by the overlap 84 provided between one extension panel 54 and the adjacent extension panel 54 a).

The profile of each vane 100 is airfoil-shaped and is designed to direct airflow out of the slot 50 from a first direction to a second direction. Air enters the fluid inlet parallel to the longitudinal axis X-X of the attachment 10 (this is the first direction). Air flowing through the attachment 10 will naturally turn from this axis towards the slot 50, but this is the combined effect of the profile of the fins 100 together with the curvature of the slot 50 on the air flow which creates a flow in a second direction which, as previously described, is preferably slightly angled relative to the fluid inlet 20, as this encourages good winding of hair and the curls are easily removed from the attachment 10.

The tabs 100 may be regularly spaced along the length of the plate 50. However, to achieve uniform flow out of the slots 50 along the elongated body 12, it is preferred that the spacing be irregular, and that the fins 100 be more spaced apart at the first end 14 of the elongated body 12 and closer together at the second end 16 of the elongated body.

Additionally, the fins 100 become progressively smaller from the first end 14 to the second end 16 of the elongated body 12 as the amount and pressure of air flowing through the attachment 10 varies along the length from the first end 14 to the second end 16 of the elongated body 12. The angle of the tab relative to the longitudinal axis X-X of the attachment 10 varies from the first end 14 to the second end 16 of the elongate body 12. Preferably, the angle increases from the first end 14 to the second end 16 of the elongated body 12 about the longitudinal axis X-X of the attachment 10.

Fig. 10 is a side view of the plates 40 showing the spiral form around the longitudinal axis of each plate. The amount of helical rotation in the plate 40 is a function of the combination of features (such as, but not exclusively, the number of plates, the diameter of the attachment, the profile of the fins and the desired fluid outflow angle about the longitudinal axis of the attachment).

Fig. 11 to 17 show a second embodiment of the present invention. In this embodiment, components shown and described with respect to fig. 1 to 10 have like reference numerals. In this second embodiment, the diameter of the appendage 150 is 40 millimeters. Thus, the diameter of the attachment 150 is larger than the diameter of the connection ring 68 and the diameter of the fluid inlet 20 into the attachment 150. The cross-sectional area of the fitment 150 is greater than the cross-sectional area of the fluid inlet 20. Diameter d of the attachment 150₂Greater than the diameter d of the fluid inlet 20_f。

As the amount of air flowing into the attachment 150 increases within the attachment at the first end 14 of the elongated body 112, some of the air will recirculate toward the projection 160 (created between the connection ring 68 and the outer wall 182 of the attachment 150). Thus, some of the air exiting the slots 50 will flow toward the fluid inlet 20 unless the direction of flow is modified. In order that this recirculation does not affect the direction of air flow out of the slot 50, at least the first fin 170 (being the fin adjacent the first end 14 of the elongated body 112 and adjacent the fluid inlet 20) is inverted relative to all other fins 100.

This serves two functions, firstly to provide the advantage of the flow exiting the channel 50 (the amount and direction of which is consistent along the length of the channel 50, as in the previous embodiment) and secondly it serves one of the same functions as the collar 64 in the first embodiment, namely to provide an air barrier at the first end 14 of the elongate body 112 to retain hair on the attachment 150. Due to this air barrier for this second embodiment, in which the fitment 150 has a larger diameter than the fluid inlet 20, the collar 164 has the same diameter as the outer wall 182. Since this attachment 150 has a larger surface area than the attachments described above, hair is more easily adhered to the outer surface 182, so that the problem from the adverse effects of entrainment of air across the appliance toward the attachment 150 is less pronounced.

The first fin 170 has an airfoil shape, and has a concave surface 172 and a convex surface 174. The airfoil 100 also has a concave surface 102 and a convex surface 104. In order to divert the air exiting the slot 50 towards the fluid inlet 20, the concave surface 102 of the fin 100 is presented facing the fluid inlet 20 and this directs or conveys the fluid smoothly in excess towards the second direction. Smooth transition reduces pressure loss, turbulence and noise in the attachment.

In contrast, the first fin 170 has a convex surface 174 facing the fluid inlet 20. This is because the air is recirculated towards the protruding portion 160, whereby the concave face 172 of the first vane is still facing the air flow, as is the vane 100. The function is the same and the effect is similar. The direction of fluid flow is changed.

The first fin 170, along with fin 100, is adapted to turn fluid flowing within the fitment 150 from a first direction to a second direction out of the spout 50. As described above, air enters the fluid inlet parallel to the longitudinal axis X-X of the attachment 150 (which is the first direction). Air flowing through the attachment 10 will naturally turn from this axis towards the slot and in this attachment 150 the air close to the fluid inlet 20 turns further than is required. To achieve uniform flow along the length of the attachment 150, the combined action of the air flow on the first fin 170, the profile of the fin 100, and the curvature of the slot 50 on the air flow, as described above, creates a second direction of flow that is preferably slightly angled towards the fluid inlet 20 as previously described, as this promotes good hair wrapping and ease of removal of curls from the attachment 10.

Another feature of the attachment 150 is that each post 62 has a reinforcement. The first subassembly 100 is preferably injection molded as a single piece. With respect to the attachment 10, when the elongated body 12 is flared toward the fluid inlet, there is a natural taper toward the second end 16 that is used during the manufacturing process to at least partially establish the draft (draft) required to remove the central mold from the attachment 10. For the attachment 150, due to the diameter d₂Greater than the diameter d of the fluid inlet 20_fWhich are created during manufacture. To this end, in the appendage 150, the column 62 presents a local thickening 162 on the radially inner surface 162a at the inlet end 86 of the overlapping portion 84.

The localized thickening 162 may be considered a stiffening rib, protrusion, or bulge that extends along the entire length of the post 62. Adjacent the fluid inlet 20, the localized thickening 162 includes a beveled or angled surface 166 (which directs fluid flowing into the attachment from the connection ring 68 to flow past the end of the localized thickening 162).

The curvature of the localized thickening 162 additionally directs flow over the trailing edge 62b of the post 62, toward the overlap 84 and the slot 50.

Fig. 18 shows the hot air molding apparatus 200 and the attachment 10. The hot air molding apparatus 200 includes a generally tubular handle 220 having a fluid inlet 230 and a fluid outlet 240 at opposite ends. At the fluid inlet 230 of the handle, a row of holes 232 extends around and partially along the handle 220. Internally (not shown), the fan unit includes a fan and a motor. In use, the motor drives the fan and air is drawn along the fluid flow path (which extends through the length of the handle 220) through the aperture 232 in the fluid inlet 230. The fluid is selectively heated by a heater (not shown) before exiting the hot air molding apparatus at fluid outlet 240. The fluid inlet 20 of the attachment 10 of the present invention is connected to the fluid outlet 240 of the hot air molding apparatus 200 or the like and receives fluid drawn by operation of the motor. The fluid then exits the fitment 10 through the slot 50. The appliance 200 may be connected to a power source by a power cable or may house a battery within the handle 220.

The skilled person will appreciate that the manufacture and assembly of the invention may be carried out in many different ways. In the embodiment shown in fig. 2, the possible assembly sections are shown as an elongated body 12 structure having six elongated support posts, six individual plates and a cooling tip. However, the elongated body 12 may in turn be made up of several additional assembly sections. In an alternative embodiment of the invention, the elongated body 12 may include three fixation plates and three additional separate plates may be attached to the cage structure. Obviously, similar manufacturing and assembly methods can be utilized independently of some of the plates present in the embodiments.

The preferred method of manufacturing the attachment 10,150 is by injection molding, however, this is not essential to the inventive concept and the skilled person will appreciate suitable alternatives.

The diameter of the attachment 10,150 may be the same or different than the diameter of the appliance to which it is attached. Some of the inventive features described herein apply regardless of diameter, such as spacing of cooling tips, use of different subassemblies and airfoils.

Where the diameter of the accessory is shown to be different from the diameter of the appliance to which it is attached, typically both the inner and outer diameters are different.

The tabs 100,170 are shown as forming part of the panel 40, however, they may be formed as part of the post 62. The notch 44 adapted to receive the structural tab 70 is shown connected to the longitudinal flange 48, however they may be separate.

The invention has been described in detail with respect to a heated styling brush, but is applicable to any appliance (including hair dryers) that draws in fluid and directs it out of the appliance.

The appliance may or may not be used with a heater; the effect of the fluid flowing out at high speed has a drying effect.

The fluid flowing through the appliance is typically air, but may be a different combination of one or more gases, and may include additives for enhancing the performance of the appliance or the effect of the appliance on the object to which the output is directed, such as hair and the hairstyle of the hair. Such additives include, but are not limited to, for example, hair setting agents or lotions.

The invention is not limited to the detailed description given above. Various modifications will be apparent to those skilled in the art.

Claims

1. An attachment for a hair care appliance, the attachment comprising a body having a fluid inlet, a fluid outlet, a fluid flow path extending between the fluid inlet and the fluid outlet, a first fin and a second fin for directing fluid within the fluid flow path towards the fluid outlet, wherein the body comprises at least two extension panels, and the fluid outlet comprises a slot defined by an overlap between the at least two extension panels, wherein the first fin and the second fin are curved, are formed on an inner surface of the extension panels, and are positioned within the overlap between the at least two extension panels, wherein the first fin and the second fin are curved in opposite directions, wherein the first fin is adjacent the fluid inlet, the first fin has a convex surface, and the convex surface faces the fluid inlet.

2. The attachment according to claim 1, wherein the fluid inlet comprises a first cross-sectional area, the body comprises an outer wall, the outer wall of the body comprises a second cross-sectional area, wherein the second cross-sectional area is greater than the first cross-sectional area.

3. An accessory according to claim 1 or 2, wherein the fluid inlet has a diameter d_fAnd the attachment has a diameter d₂Wherein d is₂Greater than d_f。

4. An accessory according to claim 1 or claim 2 wherein the body is elongate and extends along an axis.

5. The attachment of claim 4, wherein the body has a first end and a second end, and the fluid inlet is at the first end.

6. The attachment according to claim 1, wherein the second wing has a concave surface and the concave surface faces the fluid inlet.

7. An accessory according to claim 1 or 2 wherein the first and second vanes are airfoil shaped.

8. The attachment according to claim 5, wherein the fluid outlet extends along an axis between the first end and the second end.

9. The attachment of claim 8, wherein the second tab includes a plurality of tabs spaced along the extension plate.

10. The attachment according to claim 9, wherein the plurality of tabs are irregularly spaced along the extension plate.

11. The attachment according to claim 9, wherein the plurality of tabs are angled relative to the axis of the body.

12. The attachment according to claim 11, wherein at least some of the plurality of tabs are angled differently than adjacent tabs.

13. The attachment of claim 12, wherein the angle of the plurality of fins about the axis increases toward the second end.

14. The attachment of claim 9, wherein the plurality of tabs vary in size along the extension panel.

15. The attachment according to claim 14, wherein each of the plurality of tabs has the same profile.

16. The attachment according to claim 9, wherein the overlapping portions between the plurality of tabs and the at least two extension panels have substantially the same length.

17. An accessory according to claim 1 or claim 2 wherein the slot is curved about the axis of the body.

18. The attachment of claim 17, wherein each extension plate is formed from a post and a plate.

19. An accessory according to claim 18 wherein the slot is formed by a post and plate from an adjacent extension plate.

20. The accessory of claim 19, further comprising at least one structural fin.

21. The attachment according to claim 20, wherein the at least one structural fin is connected between a post and an adjacent post.

22. The attachment according to claim 20, wherein the at least one structural tab is connected between the post and the plate.

23. An attachment according to claim 1 or claim 2, wherein the hair care appliance is a heat styling appliance.