GB2521146A

GB2521146A - A hand held appliance

Info

Publication number: GB2521146A
Application number: GB1321814.4A
Authority: GB
Inventors: Leigh Michael Ryan; Nicholas Stuart Harrod; James Dyson
Original assignee: Dyson Technology Ltd
Current assignee: Dyson Technology Ltd
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2015-06-17
Anticipated expiration: 2033-12-10
Also published as: GB2521146B; GB201321814D0

Abstract

A hand held appliance such as a hairdryer (10, fig.1) comprises a body (30, fig.1) having an outer wall 360 and a duct 310. The join between the outer wall 360 and the duct 310 comprises a first pair of fingers 362, 364 extending from the outer wall 360 and a second pair of fingers 352, 354 extending from a cone portion 350 of the inner bore and adapted to interleave with the first pair of fingers 362, 364. The outer wall 360 has a thickness t and the first pair of fingers 362, 364 is formed within the thickness of the outer wall 360. The first pair of fingers 362, 364 may extend axially of the outer wall 360 and may extend continuously around the outer wall 360. One of the fingers 352 of the second pair of fingers may be sandwiched between the first pair of fingers 362, 364. The first pair of fingers 362, 364 may comprise an external finger 362 and an internal finger 364 wherein the external finger 362 forms part of the external surface of the appliance. The external finger 362 may be longer than the internal finger 364.

Description

A Hand Held Appliance This invention relates to a hand held appliance and in particular a hair care appliance such as a hairdryer.

Generally, a motor and fan are provided which draw fluid into a body; the fluid may be heated prior to exiting the body. The motor is susceptible to damage from foreign objects such as dirt or hair so conventionally a filter is provided at the fluid intake end of the blower. Conventionally such appliances are provided with a nozzle which can be attached and detached from the appliance and changes the shape and velocity of fluid flow that exits the appliance. Such nozzles can be used to focus the outflow of the appliance or to diffuse the outflow depending on the requirements of the user at that time.

Often the body of the appliance is formed from a clam shell of two parts which are joined by gluing along a joint line or an alternative fixing method such as using screws to attach one part of the body to the other part.

A first aspect of the invention provides a hand held appliance comprising a body having an outer wall and an inner bore, the outer wall comprises a first pair of fingers extending from the outer wall, the inner bore comprises a second pair of fingers extending from the inner bore and adapted to interleave with the first pair of fingers when the inner bore is connected to the outer wall.

In this manner two parts of the body of the appliance are mechanically attached by interleaving or interlocking fingers that extend from each part. This provides a positive positioning or one of the parts with respect to the other which has an advantage when the relative locations of the two parts is important for the appliance to ifinction efficiently, effectively and for the desired life of the appliance.

In addition there are no visible attachment means for example a moulded housing for a screw so a simple clean line is produced.

Preferably, the outer wall has a thickness t and the first pair of fingers is formed within the thickness of the outer wall. This has two advantages, firstly there is continuity of the wall thickness so weak points from a change in the cross-sectional area of the wall are minimised. Secondly, moulding of the part is simplified.

It is preferred that the first pair of fingers extends axially along from the outer wall.

This again, minimises weakness in this part of the joint as stress raisers are minimised.

Preferably, one of the fingers of the second pair of fingers is sandwiched between the first pair of fingers. It is preferred that one of the fingers of the first pair of fingers is sandwiched between the second pair of fingers. Either and both of these features increase the strength of the joint.

Preferably, the first pair of fingers comprises an external finger aiid an internal finger wherein the external finger forms part of the external surface of the appliance. The external finger comprises an outer surface and an inner surface separated by the thickness t1 of the external finger and in this embodiment, the outer surface of the external finger forms part of the outer surface of the outer wall. The internal finger also comprises an inner surface and a radially outer surface separated by the thickness t2 of the internal finger. The inner surface of the internal finger preferably forms a part of inner surface of the outer wall.

It is preferred that the external finger extends frirther than the internal finger.

Preferably, the first pair of fingers extends substantially continuously around the outer wall, When the body is generally cylindrical, this means that a joint formed when the first pair of fingers are interleaved with the second pair of fingers extends around the whole of the body.

It is preferred that the inner bore comprises a duct and a side wall and the second pair of fingers extends from the side wall.

Preferably, the second pair of fingers extends substantially continuously around the side wall, It is preferred that the second pair of fingers comprises an inner finger and an outer finger.

Preferably, the side wall is formed from two parts and each part of the side wall comprises a portion of the second pair of fingers. It is preferred that a first part of the side wall comprises the outer finger. Preferably, the first part of the side wall comprises a first portion of the inner finger. It is preferred that the second part of the side wall comprises a second portion of the inner finger.

Preferably, the duct extends within the outer wall when the inner bore is connected to the outer wall.

It is preferred that a space between the outer wall and the duct defines a fluid flow path of the appliance.

Preferably, the outer wall has a thickness t and the side wall extends across the thickness t of the outer wall.

It is preferred that the side wall includes a horn which extends around the side wall and lies adjacent the outer wall forming an extension of the outer wall in the axial direction.

Preferably, the side wall extends at an oblique angle from the outer wall, It is preferred that the outer wall and the inner bore are visually distinct.

Preferably, the duct defines a further fluid flow path of the appliance.

Preferably, the appliance comprises a handle connected to the body.

It is preferred that the handle comprises a fluid inlet and a fluid flow path extending along the handle from the fluid inlet towards the body.

Preferably, the handle includes a fan unit for drawing fluid into the fluid inlet.

According to a second aspect, the invention provides a hair care appliance comprising a body having an outer wall and an inner bore, the outer wall comprises a first pair of fingers extending from the outer wall, the inner bore comprises a second pair of fingers extending from the inner bore and adapted to interleave with the first pair of fingers when the inner bore is connected to the outer wall.

In this manner two parts of the body of the appliance are mechanically attached by interleaving or interlocking fingers that extend from each part. This provides a positive positioning or one of the parts with respect to the other which has an advantage when the relative locations of the two parts is important for the appliance to fbnction efficiently, effectively and for the desired life of the appliance.

Preferably, the outer wall has a thickness t and the first pair of fingers is formed within the thickness of the outer wall, This has two advantages, firstly there is continuity of the wall thickness so weak points from a change in the cross-sectional area of the wall are minimised. Secondly, moulding of the part is simplified.

Preferably, one of the fingers of the second pair of fmgers is sandwiched between the first pair of fingers. It is preferred that one of the fingers of the first pair of fingers is sandwiched between the second pair of fingers. Either and both of these features increase the strength of the joint.

Preferably, the first pair of fingers comprises an external finger and an internal finger wherein the external finger forms part of the external surface of the appliance. The external finger comprises an outer surface and an inner surface separated by the thickness ti of the external finger and in this embodiment, the outer surface of the external finger forms part of the outer surface of the outer wall. The internal finger also compiises an inner surface and a radially outer surface separated by the thickness t2 of the internal finger. The inner surface of the internal finger preferably forms a part of inner surface of the outer wall.

It is preferred that the external finger extends further than the internal finger. Thus the external finger is longer than the internal finger i.e. the external surface of the outer wall is axially longer than the internal surface of the outer wall.

Preferably, the first pair of fingers extends substantially continuously around the outer wall. When the body is generally cylindrical, this means that a joint formed when the first pair of fingers are interleaved with the second -of fingers extends around the whole of the body.

Preferably, the second pair of fingers extends substantially continuously around the side wall.

It is preferred that the second pair of fingers comptises an inner finger and an outer finger.

Preferably, the outer wall has a thickness and the side wall extends across the thickness t of the outer wall.

Preferably, the side wall extends at an oblique angle from the outer wall.

It is preferred that the outer wall and the inner bore are visually distinct.

Preferably, the duct defines a further fluid flow path of the appliance.

Preferably, the appliance comprises a handle connected to the body.

Preferably, the hair care appliance is a hairdryer.

The invention will now be described by example, with reference to the accompanying figures, of which: Figure 1 shows a cross section through an appliance according to the invention; Figure 2a shows a cross section through a part of the body of the appliance of Figure 1; Figures 2b and 2c show enlarged views of part of the cross section of Figure 2a, Figure 3 shows an exploded view of some parts of the body of the appliance shown in Figure 1; and Figure 4a and 4b show different orientations of a duct of an appliance.

Figure 1 shows a hairdryer tO with a handle 20 and a body 30. The handle has a first end 22 which is connected to the body 30 and a second end 24 distal from the body 30 and which includes a primary inlet 40. Power is supplied to the hairdryer 10 via a cable 50.

The body 30 has a first end 32 and a second end 34 and can be considered to have two parts. A first part 36 which extends from the first end 32 which is tubular and of a generally consistent diameter and a second part 38 which extends from the second end 34 to join the first part 36. The second part 38 is cone shaped and varies in diameter along its length from the diameter of the first part 36 of the body 30 to a smaller diameter at the second end 34 of the body.

The handle 20 has an outer wall 200 which extends from the body 30 to a distal end 24 of the handle. At the distal end 24 of the handle an end wall 210 extends across the outer wall 200. The cable 50 enters the hairdryer through this end wall 210. The primary inlet 40 in the handle 20 includes first apertures that extend around and along 42 the outer wall 200 of the handle and second apertures that extend across 46 and through the end wall 210 of the handle 20. The cable 50 is located approximately in the middle of the end wall 210 so extends from the centre of the handle 20. The end wall 210 is orthogonal to the outer wall 200 and inner wall 220 of the handle.

It is preferred that the cable 50 extends centrally from the handle 20 as this means the hairdryer is balanced regardless of the orientation of the handle 20 in a users' hand.

Also, if the user moves the position of their hand on the handle 20 there will be no tugging from the cable 50 as it does not change position with respect to the hand when the hand is moved. If the cable were offset and nearer one side of the handle then the weight distribution of the hairdryer would change with orientation which is distracting for the user.

Upstream of the primary inlet 40, a fan unit 70 is provided. The fan unit 70 includes a fan and a motor. The fan unit 70 draws fluid through the primary inlet 40 towards the body 30 through a fluid flow path 400 that extends from the primary inlet 40 and into the body 30 where the handle 20 and the body 30 are joined 90. The fluid flow path 400 continues through the body 30 towards the second end 34 of the body, around a heater 80 and to a primary fluid outlet 440 where fluid that is drawn in by the fan unit exits the primary fluid flow path 400. The primary fluid flow path 400 is non linear and flows through the handle 20 in a first direction and through the body 30 in a second direction which is orthogonal to the first direction.

The body 30 includes an outer wall 360 and a duct 310. The primary fluid flow path 400 extends along the body from the junction 90 of the handle 20 and the body 30 between the outer wall 360 and the duct 310 towards the primary fluid outlet 440 at the second end of the body 30.

Another fluid flow path is provided within the body; this flow is not directly processed by the fan unit or the heater but is drawn into the hairdiyer by the action of the fan unit producing the primary flow through the hairdryer. This fluid flow is entrained into the hairdryer by the fluid flowing through the primary fluid flow path 400.

The first end 32 of the body includes a fluid inlet 320 and the second end 34 of the body indudes a fluid outlet 340. Both the fluid inlet 320 and the fluid outlet 340 are at east partially defined by the duct 310 which is an inner wall of the body 30 and extends within and along the outer wall 360 of the body 30. A fluid flow path 300 extends within the duct 310 from the fluid inlet 320 to the fluid outlet 340.

The duct is formed from a cone portion 350 arid a tubular part 312. At the first end 32 of the body 30, the cone portion 350 extends between the tubular part 312 and the outer wall 360. This cone portion 350 at least partially defines the fluid inlet 320. At the second end 34 of the body a gap 370 is provided between the outer wall 360 and the tubular part 312, this gap 370 defines the primary fluid outlet 440. The primary fluid outlet 440 is annular and surrounds the fluid flow path. The primary fluid outlet 440 may be internal so the primary fluid flow path 400 merges with the fluid flow path 300 within the body 30. Alternatively, the primary fluid outlet 440 is external and exits from the body 30 separately to the fluid from the fluid flow path 300 at the fluid outlet The duct 310 is an internal wall of the hairdryer that can be accessed from outside the hairdryer. Thus, the duct 310 is an external wall of the hairdryer. The duct 310 is recessed within the body 30 so the cone portion 350 that connects between the outer wall 360 and the tubular portion 312 of the duct 310 is angled with respect to the outer wall 360.

A PCB 75 including the control electronics for the hairdryer is located in the body 30 near the side wall 350 and fluid inlet 320. The PCB 75 is ring shaped and extends round the duct 3 0 between the duct 310 and the outer wall 360. The PCB 75 is in fluid communication with the primary fluid flow path 400. The PCB 75 extends about the fluid flow path 300 and is isolated from the fluid flow path 300 by the duct 310.

The PCB 75 controls such parameters as the temperature of the heater 80 and the speed of rotation of the fan unit 70. Internal wiring (not shown) electrically connects the PCB to the heater 80 and the fan unit 70 and the cable 50. Control buttons 62, 64 are provided and connected to the PCB 75 to enable a user to select from a range of temperature settings and flow rates for example.

In use, fluid is drawn into the primary fluid flow path 400 by the action of the fan unit 70, is optionally heated by the heater 80 and exits from the primary fluid outlet 440.

This processed flow causes fluid to be entrained into the fluid flow path 300 at the fluid inlet 320. The fluid combines with the processed flow at the second end 34 of the body.

Thus fluid that is processed by the fan unit and heater is augmented by the entrained flow.

As the space between the outer wall 360 and the duct 310 is utilised to position a heater and the PCB 75 it is important that the space inbetween the outer wall 360 and the tubular portion 3t2 of the duct 310 is maintained along the length of the body 30. One reason for this is that hot spots could be formed around the outer wall 360 and/or the tubular portion 312 of the duct 310 if the spacing between each of these and the heater 80 were not substantially constant. Hot spots could lead to premature failure of components of the appliance. At the first end 32 of the body 30, the relative locations of the outer wall 360 and the duct 310 are fixed by a joint comprising interleaved fingers which extend from the outer wall 360 and the duct 310.

Referring now to Figures 2a, 2b, 2c, 3, 4a and 4b in particular, the joint between the outer wall 360 and the duct 310 will now be described in detail. The outer wall 360 has an outer surface 360a, an inner surface 36Db separated by the thickness t of the outer wall. Towards the upstream end or the first end 32 of the body 30 the outer wall 360 comprises a first pair of fingers 362, 364 which extend axially from the outer wall 360 along the length of the body 30. Each of the first pair of fingers 362, 364 is formed Il within the thickness t of the outer wall 360. In this example both of the first pair of fingers 362, 364 extend continuously around the circumference of the outer wall 360.

The first pair of fingers 362, 364 has an external finger 362 and an internal finger 364.

The external finger 362 has an outer surface 362a and an inner surface 362b separated by the thickness of the finger ti. The outer surface 362a of the external finger 362 forms part of the external surface 360a of the outer wall 360. The internal finger 364 has an inner surface 364b and a radially outer surface 364a separated by the thickness t2 of the internal finger 364, The inner surface 364b of the internal finger 364 forms part of the internal surface 360b of the outer wall 360.

The first pair of fingers 362, 364 forms a first part of a joint between the outer wall 360 and the duct 310.

The duct 310 has a tubular part 312 and a cone or trumpet shaped portion 350. The tubular part 312 extends within the outer wall 360 and the cone portion 350 extends between the outer wall 360 and the tubular part 312 defining the further fluid inlet 320 into the appliance and sealing the fluid flow path 400 within the body 30. The cone portion 350 is obliquely angled so the tubular part 312 of the duct 310 is recessed within the body 30.

A second pair of fingers 352, 354 extends from the cone portion 350. The second pair of fingers 352, 354 is adapted to interleave with the first pair of fingers 362, 364 providing a connection or joint between the outer wall 360 and the inner bore 310 at the first end 32 of the body 30.

The outer wall 360 and the tubular part 312 of the inner bore 310 are approximately concentric and the longitudinal axes of the outer wall 360 and the tubular part 312 are approximately parallel. The second pair of fingers 352, 354 extends from an inner surface 35Db of the cone portion 350 towards the tubular part 312 and is generally parallel to the tubular part 312. Thus, when the tubular portion 312 of the duct 310 is inserted into the outer wall 360 the second pair of fingers 352, 354 will interleave and interlock with the first pair of fingers 362, 364 (Figures 2a, 2b and 2c).

The second pair of fingers 352, 354 will now be explained in more detail; there is an inner finger 354 and a radially outer finger 352. The radiafly outer finger 352 is sandwiched between or retained between the external finger 362 aiid internal finger 364.

The radially outer finger 352 has an outer surface 352a and an inner surface 352b separated by a thickness t3. When the joint between the first and second pair of fingers is made, the outer surface 352a of the radially outer finger 352 lies adjacent the inner surface 362b of the external finger 362 of the first pair of fingers and the inner surface 352b of the radially outer finger 352 lies adjacent to the radially outer surface 364a of the internal finger 364 of the first pair of fingers.

The inner finger 354 of the second pair of fingers has an inner surface 354b and a radially outer surface 3 54a separated by a thickness t4. When the joint between the two pairs of fingers is made, the internal finger 364 of the first pair of fingers is sandwiched between of interleaved between the inner finger 354 and the radially outer finger 352 of the second pair of fingers. Thus, the radially outer surface 354a of the inner finger 352 and the inner surface 352b of the radially outer finger 352 lie adjacent the inner surface 364b of the internal finger 364 and the radially outer surface 364a of the internal finger 364 respectively.

In the example described, each of the fingers of the first pair of fingers 362, 364 and the second pair of fingers 352, 354 are approximately the same thickness, This reduces the chance of a weak link in one of the fingers involved in the joint. Thus t1, t2, t3 and t4 are all substantially equal.

The first pair of fingers 362, 364 is continuous around the outer wall 360 of the body 30. The second pair of fingers 352, 354 is also continuous around the cone portion 350 of the duct 310.

H

In this example, the cone portion 350 includes some control buttons 62 which are accessed by a user from the outer face 350b of the cone portion 350. The control buttons 62 are used to change flow and temperature seftings of the appliance for example. In order to facilitate manufacture of the parts of the appliance around the buttons 62, the cone portion 350 is made in two parts. A first part 400 includes the duct 312, the radially outer finger 352, a first portion 356 of the inner finger 354 and the outer surface 350a of the cone portion 350. A second part 402 is an arcuate section that provides supports for features of the buttons 62, housings for light guides 404 that provide a visual indication of the current setting of the control buftons 62 and a second portion 454 of the inner finger 354. When the first part 400 and the second part 404 of the cone portion 350 are combined, the first portion 356 and the second portion 454 of the inner finger 354 are united to form a continuous ring around the cone portion 350.

The first part 400 and the second part 402 of the cone portion 350 can bejoined by any one of a number of ways including gluing, welding etc... In this example, once the second part 402 has been attached to the first part 400, heat stakes 358 which are initially used help correctly locate the second part 402 with respect to the first part 400 are melted fixing the relative location of the first part 400 and the second part 402 of the cone portion 350.

The cone portion 350 and the outer wall 360 of the body 30 can be push fit together, however it is preferred that the joint between the outer wall 30 and the duct 3 tO is additionally glued to prevent accidental access to any of the internal parts of the appliance such as the PCB 75 or the heater 80. The glue can be applied to specific surfaces of the joint for example 352b and 364a or/and a reservoir of glue can be provided between either or both of the first pair of fingers 362, 364 and the second pair of fingers 352, 354 which is spread along joint faces during assembly of the joint when the duct 310 is pushed into the outer body 30. It is preferred that the amount of glue is sufficient to provide an adequate strength ofjoint but not enough that glue purges either internally within the body 30 or externally around the external finger 362 of the first pair of fingers.

N

The cone portion 350 of the duct 310 is provided with a horn 370. The horn 370 is essentially a continuation of the cone portion 350 radially outwards beyond the second pair of fingers 352, 354. The horn 370 forms an upstanding rim around the cone portion 350 that extends radially out farther than the radially outer finger 352. When the duct 310 is inserted into the body 30 an outer face 370a of the horn 370 aligns with the outer surface 360a of the outer wall 360 of the body 30 and the outer surface 362a of the external finger 362 providing a continuation of the outer wall 360 of the body 30. A gap 372 may be provided between the horn 370 and the external finger 362 to absorb any small deviations in size of the body 30 and duct 310, The outer wall 360 and the duct 300 are preferably moulded from a plastic material.

Suitable plastic materials include polycarbonate, glass-filled PPA (Polyphthalamide), PPS (Polyphenylene Sulphide), LCAP (Liquid Crystal Aromatic Polymer) or PEEK (Polyether ether ketone) and the skilled person will appreciate that this list is not exhaustive and that other materials could be used with alternative manufacturing methods, The outer wall 200 of the handle 20 can be made from any of a number of suitable materials but is preferably made from aluminium, an alloy of aluminium a steel or a stainless steel, In the embodiments described, the motor and fan were located within the handle of the appliance, this is not essential, The duct 300 need not provide a further fluid flow path, the cone portion 350 could extend across the whole of the area described by the outer wall 360 and the duct 300 could be used to house a fan unit.

The invention has been described in detail with respect to a hairdryer however, it is applicable to any appliance that draws in a fluid and directs the outflow of that fluid from the appliance, The appliance can be used with or without a heater; the action of the oufflow of fluid at high velocity has a drying effect. b

The fluid that flows through the appliance is generally air, but may be a different combination of gases or gas and can include additives to improve performance of the appliance or the impact the appliance has on an object the output is directed at for example, hair and the styling of that hair.

The invention is not limited to the detailed description given above. Variations will be apparent to the person skilled in the art.

Claims

CLAiMS I. A hand held appliance comprising a body having an outer wall and an inner bore, the outer wall comprises a first pair of fingers extending from the outer wall, the inner bore comprises a second pair of fingers extending from the inner bore and adapted to interleave with the first pair of fingers when the inner bore is connected to the outer wall.
2. An appliance according to claim 1, wherein the outer wall has a thickness t and the first pair of fingers is formed within the thickness of the outer wall.
3. An appliance according to claim I or claim 2, wherein the first pair of fingers extends axially along from the outer wall.
4. An appliance according to claim 1 or claim 2, wherein one of the fingers of the second pair of fmgers is sandwiched between the first pair of fingers.
5. An appliance according to any preceding claim, wherein one of the fingers of the first pair of fingers is sandwiched between the second pair of fingers.
6. An appliance according to claim 4 or claim 5, wherein the first pair of fingers comprises an external finger and an internal finger wherein the external finger forms part of the external surface of the appliance.
7. An appliance according to claim 6, wherein the external finger extends further than the internal finger.
8. An appliance according to any preceding claim, wherein the first pair of fingers extends substantially continuously around the outer wall.
9. An appliance according to any preceding claim, wherein the inner bore comprises a duct and a side wall and the second pair of fingers extends from the side wall,
10. An appliance according to claim 9, wherein the second pair of fingers extends substantially continuously around the side wall,
11. An appliance according to claim 10, wherein the second pair of fingers comprises an inner finger and an outer finger.
12. An appliance according to claim 11, wherein the side wall is formed from two parts and each part of the side wall comprises a portion of the second pair of fingers.13 An appliance according to claim 12, wherein a first part of the side wall comprises the outer finger.14. An appliance according to claim 12 or claim 13, wherein the first part of the side wall comprises a first portion of the inner finger.15. An appliance according to any of claims 12 to 14, wherein the second part of the side wall comprises a second portion of the inner finger.16. An appliance according to any of claims 9 to 15, wherein the duct extends within the outer wall when the inner bore is connected to the outer wall, 17. An appliance according to claim 16, wherein a space between the outer wall and the duct defines a fluid flow path of the appliance.18. An appliance according to any of claims 9 to 17, wherein the outer wall has a thickness t and the side wall extends across the thickness of the outer wall.19. An appliance according to claim 18, wherein the side wall includes a horn which extends around the side wall and lies adjacent the outer wall forming an extension of the outer wall in the axial direction.20. An appliance according to any of claims 9 to 19, wherein the side wall extends at an oblique angle from the outer wall.21. An appliance according to any preceding claim, wherein the outer wall and the inner bore are visually distinct.22. An appliance according to any preceding claim, wherein the duct defines a further fluid flow path of the appliance.23. An appliance according to any preceding claim, comprising a handle connected tothebody.24. An appliance according to claim 23, wherein the handle comprises a fluid inlet and a fluid flow path extending along the handle from the fluid inlet towards the body.25. An appliance according to claim 23 or claim 24, wherein the handle includes a fan unit for drawing fluid into the fluid inlet.25. A hand held appliance comprising a body having an outer wall and an inner bore, the outer wall comprises a first pair of fingers extending from the outer wall, the inner bore comprises a second pair of fingers extending from the inner bore and adapted to interleave with the first pair of fingers when the inner bore is connected to the outer wall.26. An appliance according to claim 25, wherein the outer wall has a thickness t and the first pair of fingers is formed within the thickness of the outer wall.27. An appliance according to claim 25 or claim 26, wherein the first pair of fingers extends axially along from the outer wall.28. An appliance according to claim 25 or claim 26, wherein one of the fingers of S the second pair of fingers is sandwiched between the first pair of fingers.29. An appliance according to any of claims 25 to 28, wherein one of the fingers of the first pair of fingers is sandwiched between the second pair of fingers.30, An appliance according to claim 28 or claim 29, wherein the first pair of fingers comprises an external finger and an internal finger wherein the external finger forms part of the external surface of the appliance.31. An appliance according to claim 30, wherein the external finger extends further than the internal finger.32. An appliance according to any of claims 25 to 31, wherein the first pair of fingers extends substantially continuously around the outer wall.33. An appliance according to any of claims 25 to 32, wherein the inner bore comprises a duct and a side wall and the second pair of fingers extends from the side wall.31. An appliance according to claim 33, wherein the second pair of fingers extends substantially continuously around the side wall.32. An appliance according to claim 31, wherein the second pair of fingers comprises an inner finger and an outer finger.33. An appliance according to claim 32, wherein the side wall is formed from two parts and each part of the side wall comprises a portion of the second pair of fingers.34 An appliance according to claim 33, wherein a first part of the side wall comprises the outer finger.35. An appliance according to claim 33 or claim 34, wherein the first part of the side wall comprises a first portion of the inner finger.36. An appliance according to any of claims 33 to 35, wherein the second part of the side wall comprises a second portion of the inner finger.37. An appliance according to any of claims 33 to 36, wherein the duct extends within the outer wall when the inner bore is connected to the outer wall.38. An appliance according to claim 37, wherein a space between the outer wall and the duct defines a fluid flow path of the appliance.39. An appliance according to any of claims 33 to 38, wherein the outer wall has a thickness t and the side wall extends across the thickness of the outer wall.40. An appliance according to claim 39, wherein the side wall includes a horn which extends around the side wall and lies adjacent the outer wall forming an extension of the outer wall in the axial direction.41. An appliance according to any of claims 33 to 40, wherein the side wall extends at an oblique angle from the outer wall.42. An appliance according to any of claims 25 to 41, wherein the outer wall and the inner bore are visually distinct.43. An appliance according to any of claims 25 to 42, wherein the duct defines a further fluid flow path of the appliance.44. An appliance according to any of claims 25 to 43, comprising a handle connected to the body.45, An appliance according to claim 44, wherein the handle comprises a fluid inlet and a fluid flow path extending along the handle from the fluid inlet towards the body.46. An appliance according to claim 44 or claim 45, wherein the handle includes a fan unit for drawing fluid into the fluid inlet.47, An appliance according to any of claims 25 to 46, wherein the appliance is a hairdryer.48. A hairdryer substantially as herein described, with reference to the Figures.