Hair treatment device using steam application.

Abstract

Hair treatment device using steam application. The invention relates to a hair treatment device comprising: - a vaporization chamber having a first volume with a fluid inlet and a second volume in fluidic communication with the first volume via a passage with a cross-section smaller than that of the first volume; - a hair treatment plate configured to come into contact with or opposite the hair, having at least one steam outlet; and - a steam distribution chamber, in fluidic communication with the second volume and supplying steam to the steam outlet, the latter opening directly into the distribution chamber; and - at least one heating structure housed within the device, sandwiched between an extension plane of the treatment plate and extension planes of the first and second volumes, and extending on either side of the steam outlet. Figure for the abstract: Fig. 1

Description

Description Title of the invention: Device for treating hair by ap- steam application.

[0001] — The present invention relates to a hair treatment device in particular by application of steam and a corresponding treatment method. Prior art

[0002] — We know of many types of hairdressing devices or accessories allowing the shaping of hair, in particular by straightening, curling or crimping. We can Examples include hair straighteners, curling irons, and hairbrushes.

[0003] — To improve treatment, some devices provide steam distribution. towards a strand of hair or the hair. These devices have a chamber vaporization system allowing to vaporize a liquid from a liquid reservoir and a or several steam outlets in fluid communication with the steam chamber- erization to apply steam to the hair.

[0004] — Patent application EP 3 097 815 describes a styling device with emission of steam from a vaporization chamber in a base to steam outlets on a handpiece. The vaporization chamber is far from the handpiece, which which requires transporting steam to the handpiece.

[0005] — International applications WO 2009 / 077676 and WO 2013 / 128092 describe hair styling devices with steam emission at the periphery of the device and the hair heating area.

[0006] — Patent application EP 2449909 and international applications WO 2020 / 127852 and WO 2020 / 127851 describe styling appliances with two spaces in the vaporization chamber separated from each other by a wall with an opening. The steam outlets are on the periphery of the device on a distribution chamber lateral to the vaporization chamber.

[0007] — There is a need for a hair treatment device, particularly of the type brush, making it possible to secure the emission of steam while limiting the scaling of steam outlets Statement of the invention

[0008] = The invention meets this need with the aid of a hair treatment device by steam comprising - a vaporization chamber having a first vaporization volume having an inlet for fluid to be vaporized and a second vaporization volume in fluid communication with the first vaporization volume by a passage of reduced section compared to at least one cross section of the first volume of vaporization, - a hair treatment sole configured to come into contact with or face the hair having at least one steam outlet, and - a steam distribution chamber separate from the vaporization chamber, in fluid communication with the second vaporization volume and supplying steam to the steam outlet, the steam outlet opening directly onto the distribution chamber, and - at least one heating structure housed in the device sandwiched between an extension plane of the treatment sole and extension planes of the first and second vaporization volumes and extending on either side of the steam outlet. By "in fluid communication", we understand that the passage of fluid between the two volumes is made possible, in particular by openings which coincide with each other or which are connected by a fluid passage conduit. By "on either side" is meant that the heating structure has a first part extending laterally on one side of the steam outlet and a second part extending laterally on the other side of the steam outlet. By "extension plan" we mean a median plane defined in particular by width and length. By "sandwiched between an extension plane of the treatment sole and extension planes of the first and second vaporization volumes", it is understood that the heating structure is arranged between an extension plane of the treatment sole and an extension plane of the first volume and between the extension plane of the treatment sole and an extension plane of the second vaporization volume. The presence of two vaporization volumes separated from each other by a reduction in section makes it possible to limit the passage of liquid water from the first volume to the second vaporization volume and to retain scale particles which could form in the first vaporization volume. The presence of a steam distribution chamber separate from the vaporization chamber makes it possible to limit the flow of liquid water onto the hair during treatment, regardless of the orientation of the device. This ensures safer operation and increased user comfort because the device can be used without having to worry about its orientation. The device according to the invention makes it possible to pool the heating means necessary for the production of steam on the one hand and for heating the treatment sole on the other. It thus has the advantage of allowing compact manufacturing of the device. In addition, energy losses can be reduced, as the heat released can be used to the best advantage. In addition, such a structure allows for a vaporization zone for the steam between two heating zones and therefore allows heat, then steam and heat again to be applied successively to the hair. Preferably, the treatment sole is intended to come into contact with the hair. Preferably, this treatment sole comprises a base having an outer surface that is substantially flat or substantially curved outwards. Preferably, this treatment sole is, in front view, of substantially polygonal outline, in particular rectangular or square, but may also be circular or oval. Preferably, the treatment device is of an elongated shape along a main axis. Alternatively, the treatment device is of another, non-elongated shape. Preferably, the treatment device comprises a handpiece having a handle and a head. The handle facilitates gripping the device and allows the insertion into the device of additional elements, in particular a user interface, a reservoir of fluid to be vaporized and possibly a reservoir of cosmetic product. Preferably, the head comprises the vaporization chamber, the distribution chamber(s), the heating elements and the treatment soleplate. The head of the treatment device may be of any shape in cross-section. Preferably, the head of the treatment device is of substantially polygonal shape in cross-section, in particular substantially rectangular or substantially square, or substantially oval or circular. Other cross-sectional shapes are possible, such as a cross-section with a polygonal outline on one side and a non-polygonal outline, in particular rounded, for example circular, on the other. Preferably, the head of the device is of generally flattened shape in cross-section. Preferably, the device comprises a reservoir of fluid to be vaporized integrated into the handpiece, in particular in the handle of the latter as indicated previously. Alternatively, the device comprises a base fluidically connected to the handpiece in which the reservoir of fluid to be vaporized is integrated. Preferably, the fluid to be vaporized is water, preferably non-demineralized and non-distilled water. Vaporization chamber Preferably, the vaporization chamber is unique in the device. Preferably, the vaporization chamber comprises a hollow body delimiting the first and second vaporization volumes. The hollow body comprises a fluid supply opening opening onto the first vaporization volume, the opening being in fluid communication with a fluid reservoir to form the fluid inlet. The hollow body may be in several parts, in particular a cavity body forming the cavity of the two vaporization volumes and a cavity closing wall extending between the cavity body and the treatment sole. The cavity body may be in one piece. Alternatively, the hollow body is in one piece. The reduced section passage may have an area reduced to more than 50%, better still to more than 70% compared to the area of ​​at least one cross-section of the first vaporization volume, better still compared to the area of ​​the cross-sections of the first vaporization volume over more than half of its length, better still over more than 80% of its length. The vaporization chamber may comprise a separating wall for the first and second vaporization volumes having an opening forming the passage of reduced section. The opening may have a width less than or equal to 50%, better still less than or equal to 70% of the width of the separating wall. The first and second vaporization volumes may be of the same width or the second vaporization volume may be of smaller width than the second vaporization volume. Preferably, the vaporization chamber, without taking into account the fluid inlet, is symmetrical about a longitudinal axis. Preferably, the vaporization chamber, without taking into account the fluid inlet, is symmetrical about a median plane extending along the longitudinal axis of the vaporization chamber. The vaporization chamber, especially the first volume, may be wider than it is high, the height being taken according to the axis of superposition between the vaporization chamber, the heating structure and the treatment sole. Preferably, said extension planes of the first and second vaporization volumes are identical or parallel to each other. Alternatively, they are inclined to each other at an angle strictly less than 90°, better still less than or equal to 45°. Preferably, the second vaporization volume extends longitudinally in the extension of the first vaporization volume with the passage of reduced section between them. Preferably, the first and second vaporization volumes are elongated along the same longitudinal axis. Preferably, the first vaporization volume and the second vaporization volume extend successively along the longitudinal axis of the vaporization chamber. Preferably, the passage of reduced section is opposite the inlet of fluid to be vaporized in the first vaporization volume along the longitudinal axis of the vaporization chamber. The second vaporization volume has a supply opening of the distribution chamber. The supply opening of the distribution chamber may extend to the longitudinal end of the second vaporization volume opposite the passage of reduced section. The second vaporization volume may be devoid of any opening other than that for supplying the distribution chamber and the passage of reduced section between the first and second vaporization volumes. Preferably, the vaporization chamber extends along a longitudinal axis parallel to the longitudinal axis of the treatment sole. The vaporization chamber may have a cross-sectional wall opposite the treatment sole which is concave towards the treatment sole, in particular extending in cross-section in the form of a semicircle, a semi-ellipse or a regular semi-polygon. Such a cross-sectional shape of the vaporization chamber makes it possible to have a substantially constant and homogeneous pressure and temperature of the vapor in the vaporization chamber, which makes it possible to limit the presence of liquid water particles suspended in the vapor contained in the vaporization chamber. Alternatively, the vaporization chamber is, in cross-section, of substantially polygonal shape, in particular rectangular. Such a shape allows substantially uniform heating of the vaporization chamber over its entire width and rapid formation of steam. Preferably, the vaporization chamber comprises a wall facing, better in contact with the heating structure which is substantially flat. The volume of the vaporization chamber can be between 3000 mm° and 20000 mm. The second vaporization volume can have a volume greater than or equal to 5%, better still greater than or equal to 8%, even better greater than or equal to 10% of the total volume of the vaporization chamber. Such a vaporization chamber can contain enough steam to ensure effective treatment of the hair while maintaining a sufficiently compact and lightweight device. Preferably, the second vaporization volume comprises one or more baffles in the vapor path. The baffle or baffles may be formed by one or more reliefs locally reducing the passage section or a wall in the vapor path reducing the passage section of the vapor and, preferably, imposing a zigzag path of the vapor. The or one of the baffles may constitute the passage of reduced section. The second vaporization volume may have a cross-sectional area less than or equal to the cross-sectional area of ​​the reduced-section passage. The second vaporization volume may be of width less than or equal to the width of the reduced section passage. The vaporization chamber can be free of any element absorbing the liquid to be vaporized. The device is thus simpler to manufacture and lighter. It is therefore easier to handle, and in the case of a brush, it allows the hair to be brushed in several directions. Vaporization of the water is also facilitated and the formation of limescale is limited. The vaporization chamber, especially the first vaporization volume, can have one or more internal coatings, including a hydrophobic coating. Such a coating can reduce the risk of scale formation and facilitate vaporization of the fluid. The inlet of fluid to be vaporized can be connected to a reservoir of fluid in the liquid state, in particular water. The device may comprise a system for supplying water to the vaporization chamber, in particular a pump. The supply system may be configured to supply the vaporization chamber as a function of the temperature of the latter or as a function of the time elapsed since the device was started. The supply system may be configured to supply the vaporization chamber only when the temperature of the chamber is greater than a predefined threshold temperature or when the time elapsed since the device was started is greater than or equal to a predetermined time corresponding in particular to the time taken for the temperature to rise to a predefined threshold temperature of the vaporization chamber. The temperature of the vaporization chamber may be measured using a sensor arranged therein, or at the interface between the heating structure and the vaporization chamber. This temperature-dependent control of water supply limits the risk of applying liquid water instead of steam. The device may include a steam control member configured to control whether or not steam is applied to the hair. For example, the steam control member may control the supply of water to the vaporization chamber. When the user wants to apply steam to their hair, they activate the steam control member, which then controls, for example, a pump connected to the reservoir to supply liquid water to the vaporization chamber. Supply member Preferably, the device comprises a vaporizing fluid supply member extending at least partially into the vaporization chamber through the vaporizing fluid inlet. The fluid supply member may include at least one supply tube extending at least partially into the first vaporization volume. The tube may have a plurality of spaced-apart supply ports each opening into the first vaporization volume, including ports extending toward opposite sides of the first volume relative to the supply tube. Preferably, the feed tube extends along the longitudinal axis of the first vaporization volume. The feed tube may extend along the longitudinal axis of the vaporization chamber. The feed tube may extend along the longitudinal axis of the device. Distribution room Preferably, the distribution chamber is unique in the device. Alternatively, the device may comprise several distribution chambers parallel to each other in fluid communication with the vaporization chamber and each supplying steam to at least one steam outlet. Preferably, the distribution chamber comprises an elongated hollow body forming a steam distribution rail, the hollow body comprising a steam inlet, preferably at one of its ends, fluidly connected to the supply opening of the second vaporization volume, in particular opposite the supply opening of the second vaporization volume. The body of the distribution chamber may be at least partially integral with at least one wall of the vaporization chamber. Said wall of the vaporization chamber may constitute the bottom of the distribution chamber, the two chambers being connected to each other by an opening in the second volume made in said wall. The distribution chamber may be delimited laterally by a relief projecting from an outer surface of said wall of the vaporization chamber. The distribution chamber preferably extends longitudinally over more than 80% of the length of the treatment sole, better still over more than 90% of the length of the treatment sole, even better still over substantially the entire length of the treatment sole. The distribution chamber may extend along at least a portion of the vaporization chamber, including at least a portion of each of the first and second volumes. Preferably, the distribution chamber extends longitudinally over more than 70% of the length of the vaporization chamber, more preferably over more than 80% of the length of the vaporization chamber, even more preferably over substantially the entire length of the vaporization chamber. The cross-section of the distribution chamber may have an extent of between 0.1 and 2 cm?, better between 0.3 and 1 cm?, for example of the order of 0.5 cmê. The distribution chamber(s) is preferably sandwiched between the treatment sole and the vaporization chamber. Preferably, the distribution chamber is delimited in its lower part by a wall of the vaporization chamber, in its upper part by the treatment sole and laterally by a relief of one of said walls of the vaporization chamber and of the treatment sole. Preferably, the distribution chamber extends between two parts of the heating structure, in particular the hollow body has two longitudinal side walls separating the distribution volume of a housing of the heating structure extending on either side of the hollow body. Alternatively, the distribution chamber forms in the vaporization chamber a rib extending along the latter. The body of the vaporization chamber and the distribution chamber may be made of a thermally conductive material, in particular metal. Preferably, the thermally conductive material has a thermal conductivity greater than 10 Wm- !K1, better still greater than 50 Wm-!K"1, even better still greater than 100 Wm!K-. Treatment sole The treatment sole may comprise, in particular in the case where the distribution chamber forms in the vaporization chamber a rib extending along the latter, a groove in which the steam outlet(s) extend, the heating structure extending on either side of the groove, the groove extending opposite the distribution chamber. Preferably, the treatment sole comprises teeth and / or a base made of a thermally conductive material. The term "teeth," sometimes also called "pins" or "bristles," refers to the protruding elements of the brush between which the hair is received as the brush moves through the hair. The teeth can be of any shape. The teeth can be flexible or rigid, and may have a rounded ball or head at the end. Alternatively, the treatment sole comprises teeth and / or a base made of a thermally insulating material, in particular elastomer or plastic. Preferably, the thermally insulating material has a thermal conductivity of between 0.2 and 0.5 Wmr-!K-, The treatment sole has a single steam outlet elongated along the longitudinal axis of the treatment sole. In this case, the steam outlet may have a cross-sectional opening greater than or equal to 5 mm? Alternatively, the treatment sole comprises a plurality of steam outlets opening into the distribution chamber. The steam outlets may extend in a row of steam outlets extending along the longitudinal axis of the treatment sole, preferably being regularly spaced apart. Steam outlets can be arranged in an area without teeth. The steam outlet(s) can be provided on the base of the treatment sole. Preferably, the steam outlet(s) emit steam with an overall steam flow rate less than or equal to 5 mL.min!, better between 0.2 and 4 mL.min!, even better between 0.4 and 2 mL.min"!, preferably between 0.5 and 0.95 mL.min*. The steam outlet or steam outlet row may extend along a longitudinal axis parallel to the longitudinal axis of the vaporization chamber. The steam outlet or steam outlet row preferably opens substantially in the center of the treatment sole. The treatment soleplate may have teeth on either side of the steam outlet(s). The treatment sole may be a single piece. Alternatively, the treatment sole is in several parts, in particular a part made of a thermally conductive material and a part made of a material with low thermal conductivity. The part made of a thermally conductive material may include rows of heating teeth, the base of which extends over the heating elements. The part made of a material with low thermal conductivity may include a base having openings for receiving the heating teeth and rows of teeth made integrally with the base extending between the rows of heating teeth. The teeth may extend in at least two rows of teeth extending on either side of the steam outlet, the rows of teeth preferably each extending parallel to the main axis of the device. The treatment sole of the device may be substantially rectangular or elliptical in shape in front view and the teeth may extend in several rows of teeth, each row extending along the main axis of the device for a device with a treatment sole of substantially rectangular or elliptical contour. Preferably, the row(s) of teeth each comprise at least 3 teeth, better still between 10 and 40 teeth, even better still between 15 and 40 teeth. At least one tooth of the plurality of teeth, better still a portion of the teeth, even better still all of the teeth, can be heated by the heating structure, in particular to a temperature greater than or equal to 180°C. The combination of heating the teeth and applying steam makes it possible to improve the treatment of the hair. This makes it possible in particular to maintain a higher temperature in the steam application spaces, in particular the interdental spaces in the case where the steam is projected into these spaces. This also makes it possible to heat the hair with dry heat before or after the application of steam, which improves the treatment of the hair by steam. Using the same heating structure to produce steam and to heat the teeth of the treatment soleplate also allows for a lightweight device, making it easier to handle. At least some of the teeth of the treatment soleplate, better all of the teeth of the treatment soleplate, may be made of a heat-conducting material, in particular iron, aluminum, titanium, stainless steel, graphite, or ceramic. The heating structure may heat at least some of the teeth, in particular at least two of the teeth, better at least one or more rows of teeth, in particular can heat the set of teeth which are made of a heat-conducting material. This allows the teeth to be easily heated by the heating structure, and the hair to be in contact with hot surfaces in the combing heating zone. Said teeth may have at their end a thermal protection made of a material with low thermal conductivity, in particular elastomer or plastic, to limit the heat in the event of contact with the scalp. The material with low thermal conductivity may have a thermal conductivity of between 0.2 and 0.5 Wm-!K-—!. Preferably, the teeth have a height between 2 mm and 50 mm, better between 5 mm and 20 mm. Preferably, the teeth are free of surface growths. Preferably, at least some of the teeth, better all of the teeth, are attached to the base of the treatment sole, in particular fixed in holes in the base of the treatment sole. Alternatively, at least some of the teeth, better all of the teeth, are integral with the base of the treatment sole. The teeth may extend perpendicular to the base of the treatment sole or be inclined relative to the base of the treatment sole. Preferably, the teeth all extend along axes parallel to each other. The device may comprise, along an axis perpendicular to the main axis of the brush, an alternation of rows of teeth made of a thermally conductive material and rows of teeth made of a material that is not very thermally conductive, in particular thermally insulating. The teeth made of a thermally insulating material may be of a different height, in particular higher, than the teeth made of a thermally conductive material. Having teeth made of a material that is not very thermally conductive higher than the teeth made of a thermally conductive material also makes it possible to limit contact between the scalp and the teeth made of a thermally conductive material, with only the teeth made of a material that is not very thermally conductive coming into contact with the scalp. Heating structure Preferably, the vaporization chamber is heated primarily, in particular solely, by the heating structure extending between the vaporization chamber and the treatment sole. The heating structure may include two heating elements extending from opposite sides of the steam outlet(s). Preferably, the two heating elements are coplanar. Preferably, the heating elements are identical. Alternatively, the heating structure comprises a single heating element extending on either side of the steam outlet(s), in particular comprising a through groove or orifices for the passage of steam. The heating element(s) may include, in particular be constituted by, one or more thermal resistors or by any other suitable heating means. The heating element(s) may each be of a substantially parallelepipedal general shape. The heating element(s) may be housed in one or more housings of the device extending at least partially between the treatment sole and the first vaporization volume. The heating element(s) may have a main face facing the vaporization chamber and an opposite main face facing the treatment soleplate. The heating element(s) may be in contact by one of their main faces with a surface of the treatment soleplate, in particular a lower surface of its base. The heating element(s) may be in contact by one of their main faces, in particular the face opposite the face in contact with the treatment soleplate, with a wall delimiting the vaporization chamber. A thermal paste may be provided at the interface between the heating element(s) and the treatment soleplate, as well as at the interface between the heating element(s) and the wall of the vaporization chamber. Preferably, the heating structure is configured to heat the vaporization chamber so that, during use, in particular during the introduction of the liquid fluid into the vaporization chamber, the temperature in the vaporization chamber is always greater than or equal to the vaporization temperature of the fluid to be vaporized. The heating structure can be configured to heat the vaporization chamber to a temperature between 100 and 200°C, better still to a temperature between 110 and 180°C. The heating structure may be configured to heat at least a portion of the treatment sole to a temperature between 100°C and 250°C, better between 150°C and 230°C, even better between 170°C and 210°C. The heating element(s) may have an electrical power greater than or equal to 50W, or even 100W, 200W or 500W. In particular, the heating power of the heating elements is chosen such that, taking into account the flow rate of the arriving fluid and the temperature of the fluid, all the fluid is vaporized in the vaporization chamber continuously, as it arrives therein. The device may include a switch for turning on the heating structure. For example, the switch may be used to turn on the heating structure or a control circuit for the heating structure which, for example, regulates the temperature and supplies the heating structure with in order to respect a set temperature. The switch can be controlled by the user via a selector, for example a two- or three-position button. The selector can also be used to vary the temperature of the heating structure. The maximum temperature reached by the treatment soleplate can thus be adapted to the type of hair to be treated and / or the nature of the treatment to be carried out. The same device can therefore be used to treat several types of hair. The device according to the invention may comprise a power supply. For example, the power supply is provided by means of accumulators and / or batteries and / or by means of an electric cable connected to a mains socket or a mains adapter. The power supply can in particular be used to power the heating structure, directly or indirectly via a control circuit. Preferably, the treatment sole, the heating structure and the assembly formed by the vaporization chamber and the distribution chamber are mounted on the device in a removable manner. They can be dismantled successively or together form a directly removable block. This makes it easier to maintain the device. Brush Preferably, the treatment device is a brush, the treatment sole in particular comprising a plurality of teeth. The term "brush" means a hair treatment device consisting of a single arm carrying a plurality of teeth between which the hair is received as the brush passes over the hair. The brush may have a single row of teeth but preferably has a plurality of rows of teeth, which may be arranged in a staggered pattern. The device according to the invention allows hair to be treated effectively by brushing it. Thanks to the device according to the invention, it is possible to heat the hair and apply steam in a single action. The device according to the invention allows for long-lasting styling of the hair. Preferably, the treatment sole has an outer surface, in particular from which the teeth extend and onto which the steam outlets open, which is substantially flat or, preferably, of convex curvature towards the outside without discontinuity, or alternatively concave towards the outside without discontinuity. Preferably, in the case of a brush, the distribution chamber has two longitudinal side walls separating the distribution volume from the heating structure. Smoothing device Alternatively, the device is a hair straightening device comprising two arms connected to each other, in particular at one of their ends and capable of taking an open configuration for engaging the hair between them and a closed position for treating the hair. The two arms may each comprise a treatment jaw configured to come into a closed configuration facing each other. At least one jaw, better each jaw, may comprise a heating plate for thermal treatment of the hair forming treatment soles. At least one of the jaws may comprise the vaporization chamber, the distribution chamber, the treatment sole and the heating structure as described above. Preferably, the other jaw is devoid of a steam application system. Preferably, the treatment sole of the jaw devoid of a steam application system is mounted tilting in its housing. This allows the jaws to adjust to the thickness of the hair arranged between the jaws. Treatment method The invention also relates, according to another of its aspects, to a method for treating hair using a device according to the invention, comprising bringing the hair into contact with the treatment soleplate and applying steam to the hair via the steam outlet(s). Preferably, the total flow rate of steam exiting the steam outlet(s) may be between 0.5 and 2 g / min, more preferably between 0.7 and 2 g / min. Preferably, the method is a hair brushing treatment. The features of the device described above apply to the method in combination or individually with each other. The process can be repeated several times for complete treatment of part or all of the hair. The process may include one or more hair rinsing steps. The method may comprise at least one step of applying a cosmetic product to the lock of hair before or after using the device of the invention, in particular a brush, and preferably before. The cosmetic product may be a composition for cleaning, coloring, bleaching, conditioning, or shaping hair. Preferably, the cosmetic product is a hair shaping composition, in particular a hair curling, hair setting, or, preferably, hair straightening or smoothing composition. The cosmetic products that can be used according to the process of the invention can be liquids, gels, milks or creams in the form of simple (O / W or W / O) or multiple emulsions, or solids. The cosmetic product may contain one or more active agents chosen from reducing agents and in particular thiols, oxidizing agents and in particular hydrogen peroxide or persalts such as persulfates, coloring agents and in particular pigments, direct dyes or oxidation dyes, non-durable shaping agents and in particular styling polymers, preferably anionic, amphoteric or non-ionic, conditioning agents and in particular silicones, mineral or vegetable oils, vegetable waxes, cationic surfactants or cationic polymers, alkaline agents or acids. Even more preferably, the cosmetic product contains one or more agents chosen from oxidizing agents, reducing agents or alkaline agents of the hydroxide type. Brief description of the drawings [Fig.1] is a schematic sectional view of an example of a treatment device according to the invention, [Fig.2] schematically represents a vaporization chamber and a feed member according to the invention, [Fig.3] schematically represents an assembly of a vaporization chamber, a feed member and a distribution chamber according to the invention, [Fig.4] schematically represents the head of the treatment device of [Fig.1] without the heating structure and the treatment sole, in which the assembly of [Fig.3] is housed, [Fig.5] schematically represents the head of [Fig.4] with the heating structure and rows of heating teeth added, [Fig.6] schematically represents in longitudinal section a variant of the treatment device head, [Fig.7] schematically represents in cross-section along VII-VII the head of the device of [Fig.6], [Fig.8] schematically represents in top view a block formed of the treatment sole, the heating elements, the distribution chamber and the vaporization chamber of the treatment device of figures 6 and 7, [Fig.9] schematically represents in perspective, cut transversely, the block of [Fig.8], [Fig.10] schematically represents a detail of [Fig.9], and [Fig.11] schematically represents in longitudinal section the block of [Fig.8]. Detailed description Figures 1 to 5 illustrate a hair treatment device in the form of a brush 10. The brush 10 comprises a head 15 and a handle 20 and extends along a longitudinal axis X. The head comprises a brush body 25, in particular plastic. forming a housing 27 for a preferably removable block. The block comprises a vaporization chamber 30, a distribution chamber 40 fluidly connected to the vaporization chamber 30, heating elements 50 and a treatment sole 60. The vaporization chamber 30 comprises a body 32 delimiting a vaporization volume 34. Said body 32 comprises on its external surface a projecting space 42 delimited over its entire contour by a side wall 44 projecting from the body of constant height, the whole forming the distribution chamber 40. The body 32 is preferably made of a thermally conductive material, in particular metal. The vaporization volume 34 comprises a first wide volume 34a extending along an extension plane Ma and comprising a fluid inlet 36 in which a fluid supply member 80 extends and a second less wide vaporization volume 34b extending in continuity with the first vaporization volume 34a along the longitudinal axis of the vaporization chamber Y along an extension plane Mb. The first and second vaporization volumes 34a and 34b extend along the same longitudinal axis corresponding to the longitudinal axis of the chamber Y and along the same extension plane Ma or Mb. But it could be otherwise. For example, the second volume could extend along a plane Mb inclined at an angle of less than 45° relative to the extension plane Ma of the first volume. The second vaporization volume 34b is separated from the first vaporization volume 34a by a passage 38 of reduced section compared to that of the first vaporization volume 34a, in particular by a passage here in the form of a funnel. The second vaporization volume 34b is of a width substantially identical to the width of the passage 38 of reduced section. The second vaporization volume 34b comprises baffles 83 formed by reliefs projecting into the second vaporization volume 34b. The fluid supply member 80 is in the form of a tube having laterally a plurality of openings 82 opening into the first vaporization volume 34a. The openings 82 are preferably arranged along the length of the tube in at least two rows arranged on opposite sides of the tube in the vaporization chamber and oriented towards the surface of the vaporization chamber heated by the heating elements 50. The space 42 is connected to the vaporization volume 34 by a through opening 46 in the body 32. The through opening 46 opens into the second vaporization chamber at its end opposite the fluid inlet 36. The heating elements 50 are arranged on either side of the groove 42 partially on the vaporization chamber 30, in particular at least partially on the first vaporization volume 34a. Preferably, the heating elements 50 are each in contact with the body directly or via a thermally conductive surface, in particular a wall of the first vaporization volume 34a and a lateral surface laterally delimiting the distribution chamber 40. The heating elements 50 will therefore heat the vaporization chamber extending below and the distribution chamber extending between the two. In a variant not shown, the device may comprise a single heating element extending on either side of the steam outlet(s), the heating element comprising a through groove in which the vaporization chamber and / or the steam outlet(s) extend or comprising through orifices to at least partially form the steam outlet(s). The treatment sole 60 is configured to come into contact with or opposite the hair and is arranged on the housing to close it, in particular hermetically. It closes the distribution chamber on the top by a surface having steam outlets 70 towards the outside. The treatment soleplate may comprise two parts. It may comprise a first part formed of rows of teeth 90 made of a thermally conductive material, in particular metal, extending over the heating elements along the longitudinal axis X of the brush 50 and a second part formed of a base 62 made of a material that is a poor heat conductor, in particular plastic, and of rows of teeth 64 extending from the base along the longitudinal axis X of the brush 50 and formed integrally with the base 62. The base 62 may have openings between the rows of teeth 64 receiving the teeth of the rows of teeth 90. The steam outlets 70 may be openings of substantially circular contour and may extend between the teeth of one of the rows of teeth 64. Thus, the treatment soleplate has transversely an alternation of rows of teeth 64 that are a poor heat conductor and rows of teeth 90 that are a good heat conductor. Preferably, the teeth of the rows 90 protrude from the base of the treatment sole 62 by a distance greater than the height of the teeth of the rows 64. The brush may also have on its periphery complementary teeth 95 housed in holes in the body of the brush and surrounding the treatment sole 60. Figures 6 to 11 illustrate an alternative hair treatment device in the form of a straightening device. The smoothing device 100 has two jaws 103 and 104 movable relative to each other between a spaced-apart configuration (not shown) for introducing a lock of hair between them and a close-together treatment configuration, illustrated in [Fig.1]. The jaws 103 and 104 are carried by respective upper arms 105 and lower 106, which are, in the example considered, connected to each other at one of their ends by an articulation not shown, the device 100 thus forming a clamp. The arms 105 and 106 define, between the joint and the jaws 103 and 104, respective half-handles (not shown) on which the user can press to bring the jaws 103 and 104 together and thus pinch the hair extending between the two jaws. The jaws 103 and 104 each have a convex outer surface and a substantially planar inner surface. An elastic return member (not visible) is preferably provided to return the jaws 103 and 104 to the separated configuration, this elastic return member being for example a spring arranged around an axis of the articulation. The invention is not limited to a particular way of connecting the arms 105 and 106 to each other and the jaws 103 and 104 can be made mobile in other ways. However, the presence of an articulation is widely preferred for the ergonomics it provides. The device 100 extends, for example, along a longitudinal axis X. The device 100 comprises a cord designed to be able to provide the energy necessary for the operation of the device. The cord can thus be an electrical cord designed to connect the device to the electrical network. Without departing from the scope of the invention, the cord could also be a fluidic cord designed to supply the device with fluid to be vaporized, water for example. The device may include a water tank for steam production. A user interface, not shown in the figures, may be present on the device to allow the user to control the operation of the device. The device comprises, in at least one of the jaws 103, a vaporization chamber 120 supplying steam to a distribution chamber 130 separated from the vaporization chamber by a wall 132 of the latter. The distribution chamber 130 is covered with a treatment sole 140 configured to come into contact with the hair between the two jaws in a configuration close to the latter. The wall 132 may comprise, as illustrated, a recess 134 in the vaporization chamber 120 forming the distribution chamber 130 so that the distribution chamber 130 projects into the vaporization chamber 120. The treatment sole 140 has a row of steam outlets 125 opening outwards between the two jaws 103 and 104 from the distribution chamber 130. The steam outlets 125 are arranged equally distributed in a groove 142 of the treatment sole along the longitudinal axis of the treatment sole. The treatment sole 140 delimits with the wall 132 on the one hand and on the other side of the groove 142 two spaces each for receiving a heating element 150. Each of the two spaces is then delimited at least by the wall 132, a side wall of the groove 142 and a wall of the treatment sole 140 configured to come into contact with the hair. Preferably, the wall 132 and the treatment sole 140 are made of a thermally conductive material. The heating elements 142 therefore extend between the wall 132 and the treatment sole 140 and therefore make it possible to simultaneously heat the vaporization chamber 120 via the wall 132 and the treatment sole 140. The vaporization chamber 120 comprises a body 123 defining with the wall 132 a vaporization volume 124. The body 123 is preferably of convex shape towards the outside so as to form a large vaporization volume 124. The vaporization volume 124 comprises an inlet for fluid to be vaporized 128 at one of its longitudinal ends, in particular at its end on the handle side, and a passage 129 for the vapor in the distribution chamber 130 at its opposite end. The passage 129 is formed by an opening in the wall 132 opening at one end of the distribution chamber 130. The vaporization volume is separated longitudinally into two vaporization volumes 124a and 124b. The vaporization volumes 124a and 124b are separated from each other by baffles 126, each forming a passage of reduced section 138. The first vaporization volume 124a extends from the inlet of fluid to be vaporized 128 to the baffle 126a and the second vaporization volume 124b extends from the baffle 126b to the opening 129. The baffles 126 are formed by reliefs projecting into the vaporization volume of the wall 132 and / or the body 123. In the present case, the vaporization chamber 120 comprises a baffle 126a extending from the bottom of the body 123 towards the internal surface of the vaporization chamber of the wall 132, leaving a reduced space between the end of the baffle 126a and the internal surface of the wall 132 and a baffle 126b extending from the inner surface of the wall 132 towards the bottom of the body 123 leaving a reduced space between the end of the baffle 126b and the bottom of the body 123.The two baffles 126a and 126b are spaced apart along the longitudinal axis of the vaporization chamber by a distance less than or equal to 30% of the length L of the vaporization volume, better still less than or equal to 15% of the length L of the vaporization volume. Preferably, the two baffles 126a and 126b extend transversely in the vaporization volume substantially in the center of the vaporization volume 124. Thus, the fluid to be vaporized enters the vaporization chamber 120 through the fluid inlet 128. It vaporizes in the vaporization chamber due to the heat from the heating elements 142 diffusing through the wall 132 by circulating from the first vaporization volume 124a to the second vaporization volume 124b in passing through the baffles 126a and 126b. The baffles 126a and 126b can limit the passage of scale into the second vaporization volume 124b and improve the vaporization of the fluid. The vapor generated in the vaporization chamber 120 then passes into the distribution chamber at the distal end of the vaporization chamber 120 via the opening 129. It spreads into the distribution chamber 130 along the jaw and exits the treatment sole 140 through the steam outlets 125. The proximity of the heating elements ensures that the vapor remains in the vapor state throughout its progression through the device. The block formed by the treatment sole 140, the wall 132 and the vaporization chamber 120, illustrated in Figures 8 to 11, can be removable. In the illustrated example, the other jaw 104 comprises a treatment sole 240 configured to come into contact with the hair in a close configuration of the jaws. The treatment sole 240 has a central groove 242. The treatment sole 240 delimits, with a bottom wall 248, on either side of the groove 242, two spaces for each receiving a heating element 250. The heating elements 250 heat the treatment sole 240. When treating the hair, the hair is clamped between the two jaws 103 and 104 and the device is moved along the strand of hair. The hair is then heated and smoothed as it is clamped between the two treatment soles 140 and 240. As it passes between the grooves 142 and 242, it receives steam through the steam outlets 125. This improves smoothing. The invention is not limited to the two examples just described. The characteristics of the two embodiments may be combined to the extent that such a combination is technically possible. For example, the vaporization chamber in the context of a brush may be of the same type as that of the example of a straightening device above and vice versa. The treatment soleplate may have teeth on its surface that are integral or added, regardless of the hair treatment device. The steam outlets may or may not extend into a groove in the soleplate.

Claims

Claims

1. A hair treatment device (10; 100) using steam comprising - a vaporization chamber (30; 120) having a first volume vaporization (34a; 124a) having an inlet for fluid to be vaporized (36; 128) and a second vaporization volume (34b; 124b) in com- fluid communication with the first vaporization volume (34a; 124a) by a passage of reduced section (38; 138) compared to the first vaporization volume (34a; 124a), - a hair treatment sole (60; 140) configured to come in contact or in relation to the hair having at least one exit of steam (70; 125), and - a steam distribution chamber (40; 130) separate from the vaporization chamber (30; 120), in fluid communication with the second vaporization volume (34b; 124b) and supplying steam the steam outlet (70; 125), the latter leading directly onto the distribution chamber (40; 130), and - at least one heating structure (50; 150) housed in the device (10, 100) sandwiched between an extension plane (S) of the sole of treatment and extension plans (Ma, Mb) of the first and second vaporization volume (34a, 34b; 124a, 124b) and extending on either side of the steam outlet (70; 125).

2. Device according to claim 1, in which the section passage reduced (38; 138) is of reduced section to more than 50%, better to more than 70% compared to at least one section of the first volume of vapo- rization (34a; 124a), better compared to the section of the first volume of vaporization (34a; 124a) over more than half of its length, better over more than 80% of its length.

3. Device according to any one of the preceding claims, in which the vaporization chamber (30; 120), without taking into account the fluid inlet, is symmetrical with respect to a longitudinal axis Ÿ.

4. Device according to any one of the preceding claims, in which said extension plans (Ma, Mb) of the first and second vaporization volume are identical or parallel to each other or inclined to each other at an angle strictly less than 90°, better still less or equal to 45°.

5. Device according to any one of the preceding claims, in which the vaporization chamber (30; 120) has in section transverse a wall opposite the treatment sole (248) concave towards the treatment sole (60; 140). in particular in the form of a semicircle, semi-ellipse or regular semi-polygon.

6. Device according to any one of the preceding claims, in which the heating structure comprises two heating elements (50; 150) extending from opposite sides of the steam outlet(s) (70; 125).

7. A device according to any preceding claim, in which the second vaporization volume (34b; 124b) comprises one or several chicanes (83; 126a, 126b) on the steam path, the chicanes (83; 126a, 126b) being formed by one or more reliefs locally reducing the passage section or a wall on the path of the steam reducing the steam passage section and, preferably, imposing a zigzag path of the steam.

8. Device according to any one of the preceding claims, comprising a fluid supply member to be vaporized (80) extending at least partially into the vaporization chamber at through the inlet of fluid to be vaporized (36), the supply member in fluid (80) comprising at least one supply tube extending to the less partially in the first vaporization volume (34a) and having a plurality of spaced apart feed ports (82) each opening into the first vaporization volume (34a), including feed ports (82) extending to sides opposite sides of the first volume relative to the feed tube.

9. Device according to any one of the preceding claims, in in which the distribution chamber (40; 130) comprises a hollow body elongated forming a steam distribution rail, the hollow body comprising a steam inlet (46; 129), preferably at one of its ends, in particular opposite the feed opening of the second vaporization volume, preferably the chamber body distribution is at least partially made of material with a wall (32; 132) of the vaporization chamber.

10. A device according to any preceding claim, in which the treatment sole (60; 140) comprises teeth (64) and / or a base (60) made of a thermally conductive material.

11. A device according to any preceding claim, in which the treatment sole (60; 140) has teeth on either side on the other side of the steam outlet(s) (70; 125).

12. A device according to any preceding claim, in which the treatment sole (60; 140) comprises a row of outlets of steam (70; 125) opening into the distribution chamber (40; 130) and extending along the longitudinal axis X of the sole of treatment, preferably being regularly spaced apart.

13. Device according to any one of the preceding claims, in which the treatment sole (140) has a groove (142) in which the steam outlet(s) (125) extend, the structure heating (150) extending on either side of the groove, the groove extending opposite the distribution chamber (130).

14. A device according to any preceding claim, in which the treatment device is a brush, the treatment sole (60) comprising a plurality of teeth (64), the distribution chamber (40) having two longitudinal side walls separating the volume distribution of the heating structure housing (50), preferably the treatment sole (60) having a surface of treatment of which the teeth extend and on which the exits of steam outlet which is substantially flat or convexly curved outwards without discontinuity.

15. Method of treating hair using a device according to one of any of the preceding claims, comprising the implementation contact of the hair with the treatment sole and the application of steam on the hair through the steam outlet(s).

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