GB2484689A

GB2484689A - Hand iron cooling

Info

Publication number: GB2484689A
Application number: GB1017688.1A
Authority: GB
Inventors: Ralph Adkins; Jamie Michael Sellors
Original assignee: Morphy Richards Ltd; Morphy Richards NI Ltd
Current assignee: Morphy Richards Ltd; Morphy Richards NI Ltd
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2012-04-25
Also published as: GB201017688D0

Abstract

The hand iron 1 includes a sole plate 2 having an electric heating element and a body 4 covering the sole plate. An airflow inducing means 201 creates airflow to cool the body. The airflow inducing means may be at least one electric fan, positioned at a rear of the iron. The body may include a casing 5 with a cavity for the airflow between the casing and the sole plate. The cavity may have one or more air vents 9. An air inlet 200 may be positioned at the rear of the iron. Heat transfer may be optimised between the airflow and body by providing a contorted path within the cavity or by having internally facing vanes or fins arranged in the body. The airflow inducing means may be configured to activate automatically when the sole plate is heated and may continue to operate for a pre-determined time after the sole plate is turned off.

Description

HAND IRON COOLING

Field of the Invention

The present invention relates to hand irons.

Background to the Invention

Conventional hand irons comprise a hot sole plate for contacting garments to be ironed, and a handle which enables a user to manipulate the hand iron.

There is a basic requirement that the parts of a hand iron device normally touched by a person in use should be safe to touch without burn or injury.

However, when a user touches the hand iron, the user also needs to be protected from the sensation that the surface being touched is likely to burn or injure their skin.

For parts of the iron which may normally be touched in use, different materials may give a different temperature sensation to the user, for the same material temperature. For example a user touching a metal surface at 40°C may consider that metal surface to be holler than a plastic or wooden surface which is at the same temperature. The sensation of temperature as experienced by the user is material dependant for different materials which have the same actual temperature.

There are regulations concerning the external casing temperature of hand irons which need to be adhered to. For example, all hand irons sold in the United Kingdom must confirm to British Standard BS EN 60335. There are equivalent standards which apply in other EU states. *0*

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S. öe*S For materials used in the pads of hand irons which are normally touched in use, different materials are permitted to heat up to a different temperature above : 30 ambience, where the ambient temperature is typically around 25°C. For example the maximum specified temperatures may be: * Metal: 30°C above ambient air temperature * Plastic: 50°C above ambient air temperature In general, different materials have different temperature thresholds which they must not exceed in use, for parts of the iron which can be touched by the user.

Summary of the Invention

The use of hand irons with glass or ceramic soleplates, enables a light weight, and optionally see through iron. However this presents particular problems of thermal management of surface temperatures of such an iron.

In various embodiments described herein, there is provided a hand iron comprising a sole plate having an electric heating element and a body covering the sole plate, with an airflow inducing means, such as an electric fan for example, which creates and airflow over an outer surface of the body and/ or within the body of the iron, so as to cool the outer parts of the iron which may be normally touched by the user in use. This may protect the user from a sensation of touching an uncomfortably hot iron casing, and improve the usability of the iron.

According to a first aspect, there is provided a hand iron comprising: Sn. * . *5.s

° 25 a sole plate having an electric heating element; and * S ** S. a body covering said sole plate, **S

S

characterised by comprising: **3 30 an airflow inducing means for creating an airflow to cool said body.

Said airflow inducing means may be arranged to create an airflow which passes over an upper surface of said body.

Said airflow inducing means may be arranged to create an airflow which passes adjacent an inside surface of said body.

Preferably, the airflow inducing means comprises at least one electric fan.

The airflow inducing means may comprise one or more ducts, channels or air passages.

Said at least one electric fan is preferably positioned at a rear of the iron.

Preferably, the airflow inducing means draws ambient temperature air from a rear of said iron and creates an airflow directed towards a front of said iron. As the airflow passes adjacent surfaces of the body of the iron, heat is transferred to the airflow from the body and the temperature of the body may be reduced.

The body preferably comprises a casing, and said airflow may be created within a cavity between said casing of said body and said sole plate.

Preferably said cavity comprises one or a plurality of air vents for allowing said airflow to pass between said cavity and a position outside said cavity.

Preferably the hand iron comprises an air inlet positioned at a rear of said iron for supplying ambient air to said airflow inducing means. **tI

The air inlets may be provided on a rear face of the iron so as to draw in air SS...

* from behind the iron. * *4 * . S.. I

.: 30 The air inlets may be provided on one or both sides of the iron so as to draw in air from a position at one or more sides of the iron.

The airflow inducing means may be configured to activate automatically when the sole plate is electrically heated.

The airflow may be arranged to follow a contorted path within said cavity, so as to optimise heat transfer between said body and said airflow.

The body may have internally facing vanes or fins which are arranged at a position within said airflow to provide optimised heat transfer between said body and said airflow.

Preferably, the body has a plurality of internal passages through which said airflow passes.

The fan may be controlled so as to continue to operate for a pre-determined time after an electric current to said sole plate is turned off.

Other aspects are as set out in the claims herein.

Brief DescJption of the Drawinq For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way of example only, specific embodiments, methods and processes according to the present s,,. invention with reference to the accompanying drawings in which: Figure 1 illustrates schematically in perspective view from above a hand iron according to a first specific embodiment; ** .50 : .*, Figure 2 illustrates schematically in view from one side the hand iron of 0* * Figure 1; Figure 3 illustrates schematically a second specific embodiment hand iron, having forced air cooling of iron body surfaces; Figure 4 illustrates schematically a third embodiment hand iron having forced air cooling of a hand iron body, internally of the body; Figure 5 illustrates schematically in view from one side a fourth embodiment hand iron having airflow cooling; Figure 6 illustrates schematically a fifth embodiment hand iron with water station, having air cooling to a hand iron body; Figure 7 herein illustrates schematically in perspective view, one example of a fan suitable for use in the iron embodiments as described herein above; Figure 8 herein illustrates schematically an example of a static pressure performance of the fan of figure 7 herein; Figure 9 herein illustrates schematically a drive circuit for the DC fan of figure 7 herein; and Figure 10 herein illustrates schematically a DC drive signal suitable for operating the fan of figure 7 herein. *0 * S **s

*... 25 Detailed Descrjption There will now be described by way of example a specific mode S....' contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be 1:'> apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to

unnecessarily obscure the description.

In the following embodiments, there is described a hand iron having a transparent or translucent upper casing and a substantially transparent or translucent sole plate, which enables the user to see through the body of the iron to the fabric or garment underneath the iron.

However, in other embodiments, the sole plate and/or casing may be of an opaque material, in which case the user will be unable to see through the body of the iron to the material ironed underneath the sole plate.

Figure 1 herein illustrates schematically in perspective view from above a hand iron according to first specific embodiment, The hand iron I comprises a sole plate 2; a handle 3 formed from an injection molded plastics materials; a body 4, forming an upper surface of the hand iron, the body comprising an opaque molded plastics casing piece 5 for extending around a perimeter of the sole plate, and said casing comprises a transparent or translucent upper cowl component 6 formed of an injected molded plastics material. The plastics material may comprise for example polycarbonate.

The sole plate 2 comprises a peripheral outer frame member of metal, e.g. aluminum, and an inner glass plate member. The outer member extends around an outside of the inner transparent or translucent glass sole plate member.

The transparent/translucent portion of the sole plate, and the transparent/translucent cowl portion 6 enables the user to see through the main body of the iron to the material being ironed underneath the sole plate. *. I * I I...

Formed on either side of the body 4, there may be provided a plurality of 1:1> apertures 7, which are connected to a cavity formed inside the upper casing between the top of the sole plate, and the transparent/translucent upper cowl 6.

The hand iron further comprises internally, an electric heating element for heating the sole plate; a thermal protection switch for turning off the iron in the event of overheating; an on/off switch; a temperature selection switch, and at least one air fan positioned at the rear or heel of the iron.

The air fan is positioned internally inside the body of the iron and draws in air from an air inlet vent at the heel of the iron. The air is urged out of a first plurality of air outlets 8 positioned at a rearward portion of the upper casing 6, and/or out of a plurality of internal air vents 9 which are positioned inside the body of the iron in the cavity formed between the upper casing 6 and an upper surface of the sole plate.

Air drawn in at ambient temperature may be blown by the air fan over the upper surface of the cowl in a direction from the heel of the iron towards the tip of the iron.

Additionally and/or' alternatively, ambient temperature air may be blown by the air fan in a cavity underneath the cowl between the cowl and the sole plate, in which case, the air may exit the upper casing via a pluraflty of through aperture air vents. Air flows out of a plurality of air vents 9 into the rear of the cavity underneath the cowl. The airflow passes into the cavity, and depending on the internal shape of the cavity, may circulate or swirl around in the cavity, or may pass through the cavity in a substantially laminar flow. In either case, the relatively cool airflow comes into contact with the underside of the cowl 6, and *:e** 25 with an upper surface of the sole plate or sole plate assembly so that heat is transferred form the soleplate and/ or the casing and/ or the cowl, and is carried out of the cavity via the peripheral air outlets 7 surrounding the base of the body.

The air drawn in from the rear of the hand iron flows over the top of the cowl and/or underneath the cowl so as to cool the surface of the upper cowl 6 in order to reduce the "touch temperature" of the cowl for the user of the hand iron.

The fan may be controlled to activate automatically whenever the heating element is activated, or alternatively, the fan may be activated in response to a temperature sensor on whether the soleplate or on the casing, so that whenever the soleplate or casing reaches a predetermined temperature the fan is turned on.

There may be provided a temperature sensor on or adjacent the casing itself, in close thermal contact with the casing, which is used to sense the casing temperature, and which is used to control the fan to turn the fan on whenever the casing reaches a predetermined temperature, and which may be used to turn off the power to the heating element if the casing reaches a predetermined upper temperature limit.

The fan may be configured to operate for a predetermined time after the electric power to the soleplate is turned off, so as to provide continued cooling of the iron casing after ironing, provided that the iron continues to be plugged into the mains power supply.

Referring to Figure 2 herein, there is illustrated schematically in view from one side the passage of air through the first embodiment iron of Figure 1 herein.

In Figure 2, air flowing outside of the body of the iron is shown in solid arrows, whereas air flowing inside the iron is shown in dashed arrows. Air at en. . . . . . * * ambient temperature is drawn in at the rear of the iron via an air inlet or grille 200 *S** *:eee 25 formed in the plastics body of the iron. Electrically operated fan 201 causes an Ce.. airflow through the air inlet or grille at the rear of the iron, and out of the upper air outlet 8 immediately rear of the upper cowl 6, and through the air apertures 9 S.....

* positioned inside and at the rear of the internal cavity of the iron. * S. * . .

*.: 30 A first airflow is directed from the upper air outlets 8 over the top of the upper surface of the cowl from the rear of the iron towards the front and down towards the sides. Ideally, the position and directivity of the upper air outlets 8 is designed so as to direct airflow in a path substantially parallel with and flowing over the upper surface of the upper cowl 6 so as to cool the upper surface of that cowl.

A second airflow, represented by the dashed arrows in Figure 2 flows inside the cavity from a rear part of the cavity towards the front and sides of the cavity.

Airflow within the cavity exits the cavity via the plurality of peripherally arranged outlet vents 7 positioned immediately above an outer perimeter of the metal frame of the sole plate. The position, number and directivity of the air outlets 9 at the rear of the internal cavity are arranged such that the airflow within the cavity is optimized to conduct heat away from the under surface of the upper cowl 6, so as to reduce the temperature of that cowl and to make the cowl an acceptable touch temperature to the user.

The two separate air paths directed to the externally venting upper air outlets 8 and the internally venting lower air outlet 9 may be directed by a suitably formed duct or channel, produced as a plastics molding, inside the body of the hand iron.

In the first embodiments of Figures 1 and 2 herein, a single electrically operated fan is shown providing two separate air flows, one venting externally over the top of the cowl and the other venting internally into a cavity beneath the cowl. In variations of the first embodiment, each separate air flow may be provided with its own separate electrically operated fan, and its own separate air *:.ee 25 inlet or grille at the rear of the iron. I...

Referring to Figure 3 herein, there is illustrated schematically in view from * *.

* one side a second embodiment hand iron. The second embodiment hand iron has all the features of the first embodiment hand iron as herein before described, with the exception that air flows only over the outer surface of the body, rather than inside the body.

Consequently, the internal cavity between the underside of the cowl and the top of the sole plate is not designed to have a forced air flow passing there through.

Air at ambient temperature is drawn in through a rearwardly facing air inlet or grille 300, for example comprising a plurality of apertures in a plastics casing of the iron. The air is urged through the body of the iron via one or more electrically operated fans 301, and vents externally of the iron through a plurality of air outlet apertures 302 positioned immediately behind the upper cowl 303 of the iron.

The airflow may be directed using an internal plastics guide or duct 303 to direct airflow from the air inlet, to the plurality of air outlet apertures.

For an iron having a transparent cowl and a transparent sole plate where the user can see through the hand iron to the garment underneath, any moisture entering the cavity may give rise to condensation and interfere with the see-through feature of the iron. Therefore, an embodiment with a substantially sealed cavity, and which passes air over the top of cowl may be preferable to an embodiment where cooling of the upper cowl is performed by air passing between the cowl and the top of the sole plate.

Referring to Figure 4 herein there is illustrated schematically a third . embodiment iron. The third embodiment iron has all of the features of the first *:..s 25 embodiment iron, except that there are no externally venting upper air outlets at the rear of the cowl, so that all of the air flow drawn in from the rear of the iron is directed through the internal cavity between the cowl and the sole plate, and out of the peripheral lower air outlets 400 arranged around the base of the body immediately above the metal frame of the sole plate.

*. * 30

IS

* In the third embodiment, airflow is optimized through the cavity in the body of the iron so as to keep the upper cowl 401 as cool as possible. Airflow within the cavity is substantially as herein before described with reference to the first embodiment. Internally of the rear heel portion of the iron, the airflow is ducted by a plastics duct molding 402 to channel the air between the air inlet or grill at the rear of the iron, and the outlet apertures at the rear cavity of the iron, so as to produce an optimized airflow through the cavity.

Air is vented externally out of the cavity via the plurality of lower air outlets 400 extending around and immediately above the sole plate.

Referring to Figure 5 herein, there is illustrated schematically in view from one side a fourth embodiment hand iron.

The fourth hand iron 500 comprises a sole plate 501; a handle 502 formed from an injection molded plastics materials; a body 503, forming an upper surface of the hand iron, the body comprising an opaque molded plastics casing 504 for extending around a perimeter of the soie plate, and the casing comprising a transparent or translucent upper cowl component 505 formed of an injected molded plastics material.

The sole plate 501 comprises a peripheral outer frame member of metal, e.g. aluminum, and an inner glass plate member. The outer member extends around an outside of the inner transparent or translucent glass sole plate member. * .** * *

The transparent/translucent portion of the sole plate, and the transparent/translucent cowl portion 505 enables the user to see through the *0* main body of the iron to the material being ironed underneath the sole plate.

** .n. *

Formed on either side of the body 503 in the opaque upper cowl or casing *:*i 30 portion 504 there may be provided a plurality of air outlet apertures 506, which are connected to a cavity formed inside the upper casing between the top of the sole plate, and the transparent/translucent upper cowl 505.

The fourth embodiment hand iron has a substantially flat rear portion 507 having a raised outer ridge 508 extending partially around its perimeter, and a recessed surface 509 at the rear of the iron, which accommodates a rear air inlet grill. The air inlet grill may comprise a pattern of apertures in the plastics material of the recessed face 509.

When positioned in the upright position with the sole plate not in contact with the fabric, the recessed face 509 may permit airflow into the air inlet grill, by air flowing in a path parallel to a main surface of the recessed face 509 and through the plurality of air inlet apertures as shown by arrows 510, 511, such that the airflow to the air inlet and fan is unrestricted, even when the iron is placed upright on its rear.

Airflow within the cavity and flowing out of the cavity is substantially as herein before described with reference to the first embodiment. Air is introduced into the cavity via a plurality of vents positioned at one of the cavity, and exits the cavity via a plurality of air outlets around the sides of the cavity.

The fourth embodiment hand iron may, in variations to the embodiment be arranged such that air which is drawn in through the rear of the iron is vented externally of the iron only over the upper cowl or upper surface of the body, and is not vented internally into a cavity underneath the cowl and above the sole plate.

Alternatively, in another variation, air drawn in through the rearwardly facing air *:*** 25 inlet or grille may be vented only into an internal cavity underneath the cowl, so as to keep the underside of the cowl cool. * S *

S.....

* As with the above first to third embodiments, suitable channeling or ducting of the airflow may be provided by a formed plastics air channel designed within the body of the iron to direct the airto the appropriate air vents.

In the fourth embodiment iron, the fan may be controlled to activate automatically whenever the heating element is activated, or alternatively, the fan may be activated in response to a temperature sensor on whether the soleplate or on the casing, so that whenever the soleplate or casing reaches a predetermined temperature the fan is turned on.

Referring to Figure 6 herein, there is illustrated schematically in view from the rear according to a fifth embodiment a hand iron 600, in combination with a water station 603 for providing water to a water outlet at the front of the iron.

The fifth embodiment hand iron has all the features of the fourth embodiment hand iron as described herein before. Shown in view from the rear are a plurality of air inlet apertures 601, in this case arranged in a ribbed or mound shaped pattern, allowing airflow into the rear of the body of the hand iron.

Air may be drawn in at the rear of the iron, via inlets on a rear surface of the iron.

In this case, the surface is recessed and surrounded by a peripheral ridge, so that when the iron is rested on its rear, with the sole plate facing upwards, there is a gap between the surface on which the iron rests, and the air inlets, so that the air inlets are not obstructed with the iron in the rested position. * * S... **.*.

* Additionally and! or alternatively, a second set of air inlets 602 may be provided, at either side of the iron near to the rear of the iron. These inlets face outwardly to the sides of the iron and are always clear and are fully unobstructed in all modes of operation of the iron.

Air may be drawn in form a position at the rear of the iron and/ or from positions at one or both sides of the iron. The internal positioning of the one or more fans is preferably arranged so as to optimise to achieve maximum airflow from the inlets at the rear and/ or sides of the iron casing.

The fifth embodiment hand iron may outlet the air through a plurality of upper vents over an upper surface of the upper cowl, and/or may have an airflow in an internal cavity of the iron which vents through a plurality of peripheral air outlets near the outer rim of the sole plate, as herein before described with reference to Figure 1 herein.

In any of the above embodiments, the underside of the cowl may be provided with upright vanes or fins arranged with their lengths in a direction between the front and rear of the iron, to provide a relatively greater surface area between the body of the cowl and the airflow, to increase the rate of heat transfer between the cowl and the airflow.

In any of the above embodiments described, the transparent upper cowl can be replaced by an opaque plastics, or metal component, in which case, the iron would not be fully see-through and the sole plate may be glass or ceramic and may be either see-through or opaque.

In all of the above embodiments, the rear and / or side air inlets or grille, *.S. . . . . through which ambient air is drawn into the iron, may comprise apertures which are patterned in various shapes, for example circular apertures, square apertures, or slots. Similarly, the external apertures may be provided in different shapes such as circles, ellipses, slots, or the like.

*S** SI

S S

Further, the cowl need not be formed as a separate molding to the remaining body of the iron, but may be integrally formed from a same material.

Where, in the above embodiments a lower set of externally venting air outlets has been described around a perimeter of the sole plate, such apertures may be positioned in the upper cowl, rather than immediately above the sole plate, for venting of air from a cavity internally of the body of the iron.

In each of the above embodiments, in which the airflow conducts heat away form the inside of the casing, and through outlet vents in the casing, the airflow may arranged to follow a contorted path within a said cavity, so as to optimise heat transfer between the body of the iron and the airflow. For example, the cowl or other parts of the casing may be provided with internally facing vanes or fins which are arranged at a position within said airflow to provide optimised heat transfer between said body and said airflow. The body of the iron may have a plurality of internal passages through which the airflow passes.

In the above embodiments where air flows within a cavity between a soleplate I soleplate assembly and an upper casing, the arrangement of vents for passing air into and out of the cavity may be arranged in various configurations to optimise airflow. For example, air inlets may be positioned around the inner sides of the cavity, near the top of the sides, and may be outlet by vents which are positioned above the soleplate and around the sides of the casing, or at the tip of the casing, or any combination thereof, the precise details of which are design specific depending on optimisation of airflow to achieve the required cooling.

In the above embodiments, where a plastics casing or similar component is described, the plastics material may be any suitable heat resistance plastics material as known in the art, for example a polycarbonate material. nil

1:111: Referring to figure 7 herein, there is shown in perspective view from the front one example of a fan suitable for use in the iron embodiments as described hereinabove.

In the above embodiments, the fan component may have operating parameters substantially as follows: Bearing type: Vapo Rating voltage: 5 to 12V; Power current: 0.08 to 0.12 Amp direct current.

Power consumption: 0.4 to 0.6 Watts Rotation speed: 10,000 to 13,000 rpm.

Air flow: 3.0 to 3.5 CFM (cubic feet per minute)/ (84.95 to 99.1 litres per minute) Max static pressure: 0.18 to 0.25 inches of H20 (approx. 44.8 to 62.3 Pascals) Noise: 16 to 23 cIBA Weight: 7.5 grams External dimensions: 25mm x 25mm xlOmm +-0.5mm is.

is.... 25 * 5 Number of blades: 5 * 0 *.*.

IS....

* The fan may have a switched DC driving circuit designed for rpm : *, measurement. Os *

Referring to figure 8 herein, there is shown an example of the static pressure performance of the fan of figure 7 herein.

Referring to figure 9 herein there is illustrated schematically a drive circuit for the DC fan of figure 7 herein.

Referring to figure 10 herein, there is illustrated schematically a drive signal for the fan of figure 7 herein.

The relationship between rotation and signal pulses from the 3rd wire may be as follows: (a) I rotation = 2 pulses (4 poles' motor) (b) 1 rotation = 3 pulses (6 poles motor) (c) I rotation = 4 pulses (8 poles motor). * I S...

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I S I 55

Claims

Claims 1. A hand iron comprising: a sole plate having an electric heating element; and a body covering said sole plate, characterised by comprising: an airflow inducing means for creating an airflow to cool said body.
2. The hand iron as claimed in claim 1, wherein said airflow inducing means is arranged to create an airflow which passes over an upper surface of said body.
3. The hand iron as claimed in claim 1, wherein said airflow inducing means is arranged to create an airflow which passes adjacent an inside surface of said body.
4. The hand iron as claimed in any one of the preceding claims, wherein said airflow inducing means comprises at least one electric fan.
5. The hand iron as claimed in claim 4, wherein said at least one S.....* 25 electric fan is positioned at a rear of said iron. S... * . *.**
6. The hand iron as claimed in any one of the preceding claims, wherein said airflow inducing means draws ambient temperature air from a rear of said iron and creates an airflow directed towards a front of said iron.
7. The hand iron as claimed in any one of the preceding claims, wherein said body comprises a casing, and said airflow is created within a cavity between said casing of said body and said sole plate.
8. The hand iron as claimed in claim 7, wherein said cavity comprises one or a plurality of air vents for allowing said airflow to pass between said cavity and a position outside said cavity.
9. The hand iron as claimed in any one of the preceding claims, comprising an air inlet positioned at a rear of said iron for supplying ambient air to said airflow inducing means.
10. The hand iron a claimed in claim 9, wherein said air inlets are provided on a rear face of the iron so as to draw in air from behind the iron,
11. The hand iron a claimed in claim 9, wherein said air inlets are provided on one or both sides of the iron so as to draw in air from a position at one or more sides of the iron.
12. The hand iron as claimed in any one of the preceding claims, wherein said airflow inducing means is configured to activate automatically when said sole plate is electrically heated. *tsS13. The hand iron as claimed in any one of the preceding claims, *.s..: * 25 wherein said airflow is arranged to follow a contorted path within said cavity, so *. as to optimise heat transfer between said body and said airflow. S... S *14. The hand iron as claimed in any one of the preceding claims, and wherein said body has internally facing vanes or fins which are arranged at a 30 position within said airflow to provide optirnised heat transfer between said body and said airflow.15. The hand iron as claimed in any one of the preceding claims, wherein said body has a plurality of internal passages through which said airflow passes.16. The hand iron as claimed in any one of the preceding claims, wherein said fan is controlled so as to continue to operate for a pre-determined time after an electric current to said sole plate is turned off. *.s. * * ** .**.*I I I... * S I. I.*1IIS* * I * ISS S S 555 5 I5 SS S * IS