Hair treatment device

Abstract

Hair treatment device Device (1) for treating hair comprising: - a handpiece (2) capable of treating a lock of hair by moving along a lock of hair from a root to a tip, the device (1) having a first direction of use in which the lock moves from a front face to an opposite rear face and a second direction of use in which the lock moves from said rear face to the opposite front face; - an at least electrical power cord (17) having an attachment (18) to the handpiece that rotates relative to the handpiece (2); - a direction of use sensor (30) configured to provide data representative of the direction of use of the handpiece (2) at least among the first and second directions of use, said sensor (30) being positioned in the rotating attachment (18) of the cord (17). Figure for abstract: Fig. 1

Description

Title of the invention: Hair treatment device Technical field

[0001] The present invention relates to hair treatment devices, and more particularly, but not exclusively, those intended for shaping hair, in particular intended for curling and / or straightening hair.

[0002] The invention relates more particularly to straightening and / or curling devices comprising two jaws movable relative to each other, capable of taking a spaced-apart configuration, for introducing a lock of hair between them, and a close-together configuration, for treating the lock. Prior art

[0003] Many devices of this type have already been proposed. These devices generally comprise internal heating plates between which the strands can be pinched, in particular in the case of straightening, and / or heating plates on their external surfaces around which the strands of hair are wound, in particular in the case of curling, or at least to give them a wave. These devices are generally used by moving the device from the root to the tip of the hair with or without winding the strand depending on the desired result and the type of device.

[0004] Some of these devices are designed to be used along a strand of hair in a particular direction. In particular, on certain devices, an incorrect direction of use can lead to degraded treatment, or even be uncomfortable for the user.

[0005] KR10-2021-0016993, KR10-2017-0122407 and WO2016 / 161259 disclose hair treatment devices which comprise heating plates whose switching on and / or switching off are controlled according to the movements of the devices detected by motion detectors.

[0006] EP3429420 describes controlling the starting or stopping of the device by detection a short rotational movement of a treatment roller in one direction or the other.

[0007] US20170231353 describes a device comprising a motion sensor, including accelerometer or gyroscope types, in the gripping part to move a heated part by means of a motor in order to follow the movements of the user's hand.

[0008] EP3178347 detects a rotational movement of the device by a rotation sensor or acceleration in a gripping part in order to trigger certain actions on the device at a cooling zone.

[0009] However, these devices do not allow users to know whether or not they are using the device correctly when processing according to a preferred direction of use. Statement of the invention

[0010] There is a need for a hair treatment device that allows the user to obtain optimal and easily reproducible treatment, without complicating the use of the device. Summary of the invention

[0011] The present invention achieves this by means of, according to one of its aspects, a device for treating hair, in particular for curling and / or straightening hair, comprising:

[0012] - a handpiece capable of treating a lock of hair by moving it along a lock of hair from a root to a tip, the device having during treatment a first direction of use in which the lock moves from a front face to an opposite rear face of said device and a second direction of use in which the lock moves from said rear face to the opposite front face;

[0013] - at least one electrical power cord having an attachment to the part to be rotating hand relative to the handpiece;

[0014] - a direction of use sensor configured to provide representative data of the direction of use of the handpiece at least among the first and second directions of use, said sensor being positioned in the rotary attachment of the power cord to the handpiece.

[0015] Such detection of the direction of use makes it possible to identify the direction of use from among the first and second directions of use in order, in particular, to verify whether the user is using the hair treatment device in accordance with a preferred direction of use from among the first and second directions of use and defined by the designers of the device. Once this verification has been carried out, if the direction of use is not the correct one, it is then easy, for example, to alert the user, as will be detailed later.

[0016] The fact that the sensor is at the level of the rotary attachment also makes it possible to have detection as close as possible to the movement of the hand and, in the case in particular of a handpiece in the form of two articulated arms, to avoid the movement of the arms between them.

[0017] Preferably, the device is a hair shaping device, in particular for curling and / or straightening.

[0018] Preferably, the handpiece has a handle and a head. The handle makes it easier to grip the device and allows the insertion into the device of additional elements, in particular a user interface, a reservoir of fluid to be sprayed and possibly a reservoir of cosmetic product.

[0019] 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 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. Jaws

[0020] The handpiece may be elongated along a longitudinal axis. The front and rear faces may extend along the longitudinal axis of the handpiece.

[0021] The handpiece is preferably asymmetrical with respect to at least one longitudinal median plane extending between the front and rear faces of the handpiece.

[0022] The fact that the handpiece is asymmetrical with respect to at least one longitudinal median plane has the effect that the treatment of the hair is asymmetrical during the treatment, that is to say that by separating the treatment into two parts of equal duration, for a movement at constant speed of the handpiece, the second part of the treatment is different from the inverse of the first part of the treatment. Thus, the treatment is different according to the first and second directions of use.

[0023] As a result, such an asymmetry of the device generates different treatment effects on the lock of hair depending on whether the device is used in the first or second direction of use. Detection of the direction of use can therefore make it possible to identify the treatment applied to the lock of hair. This makes it possible in particular to obtain a desired and easily reproducible treatment of the lock of hair.

[0024] Such asymmetry of the treatment can in particular lead to degraded treatment when the direction of use is not as prescribed, that is to say treatment of lower quality than what the device can provide when used correctly in an optimal direction of use.

[0025] Thus, thanks to the sensor data, representative of the direction of use, it may be possible to signal to the user that he is not carrying out the treatment correctly.

[0026] The handpiece, in particular the head of the handpiece, may comprise two jaws connected to each other and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration.

[0027] Preferably, when the handpiece comprises two jaws connected together and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration, the jaws extend at a distal end of the handle. The two jaws may be connected together at a proximal end by a resilient hinge, particularly configured to maintain the two jaws in an open configuration.

[0028] The jaws may each be carried by an arm, the two arms being connected to each other, in particular by a joint at one of their ends, to take the closed or open configuration of the jaws. The two arms may each comprise a half-handle on the joint side and one of the jaws on the free end side.

[0029] The device may comprise a jaw configuration detection member configured to detect whether the jaws are in the closed processing configuration or the open configuration, in particular a Hall effect sensor. The detection member may be arranged at the jaws or the gripping portion of the arms.

[0030] The direction of use sensor can be configured to provide data representative of the direction of use only when the jaws are in the closed configuration, in particular when the detection member detects a closed configuration of the jaws.

[0031] The handpiece, in particular at least one of the jaws, may comprise at least one internal treatment member comprising an internal treatment surface configured to come into contact with or opposite a portion of the lock of hair during treatment. The internal treatment surface is preferably thermal. The treatment member is preferably a heating plate.

[0032] Each jaw may comprise an internal treatment member comprising an internal treatment surface configured to come into contact with or opposite the treatment member of the other jaw.

[0033] In the closed configuration of the jaws, the handpiece is preferably asymmetrical with respect to at least one longitudinal median plane transverse to the treatment surface.

[0034] The handpiece may comprise at least one external treatment member comprising an external treatment surface configured to come into contact with a portion of the lock of hair during treatment, the external treatment surface being in particular thermal, in particular being a heating sheet.

[0035] The external treatment member makes it possible in particular to curl the hair by winding the hair around the handpiece and / or around one or each jaw.

[0036] The rotatable attachment of the power cord may extend over the handle of the handpiece, including a proximal end of the handle, for example a proximal end of a half-handle.

[0037] The rotatable attachment may extend at the joint connecting two movable arms together between an open configuration for engaging the hair together and a closed treatment configuration.

[0038] The attachment of the cord to the handpiece may be rotatable substantially around the longitudinal axis of the handpiece, or an axis forming a non-perpendicular angle relative to the longitudinal axis of the handpiece but remaining in the longitudinal median plane transverse to the treatment surface.

[0039] By "substantially around the longitudinal axis" is meant the rotation of the fixing takes place along an axis forming, in a longitudinal plane, an angle less than 20° to the longitudinal axis.

[0040] As explained below, when using the device, when the user changes the orientation of the handpiece, he performs a rotation with respect to the Earth's horizontal around the longitudinal axis of the handpiece. Thus, having the rotary attachment substantially around the longitudinal axis of the handpiece, or an axis forming a non-perpendicular angle with respect to the longitudinal axis of the handpiece, has the consequence that the rotary attachment rotates when the orientation of the handpiece with respect to the Earth's horizontal around the longitudinal axis of the handpiece is changed. Cord

[0041] Preferably, the cord comprises a bent portion at its end connected to the handpiece. The bent portion may form a branch angle between two parts of the cord of between 90° and 170°, preferably between 120° and 160°, advantageously substantially equal to 140°. Such a bent portion facilitates the use of the handpiece by reducing the size of the cord in view of its rigidity in the longitudinal direction of the handpiece. This also makes it possible, in connection with the rotary attachment, to have a cord which is always oriented in the same substantially vertical direction, in this case downwards under the effect of its own weight, without tilting in the opposite direction when the handpiece rotates, which facilitates the detection of the direction of use.

[0042] The cord is configured so that its bent portion has a median plane in use in a substantially vertical plane.

[0043] In a variant, the cord is oriented when taken in hand under the effect of its own weight and the direction of orientation sensor detects a change in orientation relative to the initial orientation to deduce a direction of use relative to the initial position. The cord may be weighted, for example in its center or eccentrically. In this case, the weighting allows the cord to be oriented downwards by the weight of the weighting. In this case, the representative data is preferably a variation in the position of the cord or its rotary attachment.

[0044] Preferably, the rotary attachment is configured so that the rotational movement of the handpiece is substantially independent of the rotation of the cord. This allows for the detection of the direction of use at the cord attachment by detecting the orientation of the handpiece relative to the rotary cord attachment. Direction of use sensor

[0045] The sensor of the direction of use may be a sensor of the position, rotation and / or orientation of the rotary attachment of the power cord relative to the handpiece. The data representative of the direction of use may correspond to a position included in a range of positions of the power cord relative to the handpiece among at least two predetermined distinct position ranges corresponding respectively to the first and second directions of orientation, a rotation of the rotary attachment included in a range of rotations of the power cord relative to the handpiece among at least two predetermined distinct rotation ranges and / or an orientation in a range of orientations of the rotary attachment of the power cord relative to the handpiece among at least two predetermined distinct orientation ranges.In fact, the power cord, due to its rotating attachment, tends to maintain a relatively fixed orientation relative to the Earth's horizontal at the level of its attachment to the handpiece, in particular to extend vertically.

[0046] The first direction of use may be an optimal direction of use for performing the treatment along the strand of hair optimally, and the second direction of use may be an opposite degraded direction of use.

[0047] The direction of use sensor may comprise a first part fixed relative to the handpiece and a second part fixed relative to the cord, the sensor being configured to determine the position, rotation and / or orientation of the first part relative to the second part, or vice versa.

[0048] The first and second parts may comprise electrical connection elements configured between them to have at least one or more different electrical characteristics in two ranges of positions and / or orientations of the rotary attachment corresponding respectively at least to the first and second direction of use. The electrical characteristic(s) may comprise a voltage, an intensity and / or a resistance.

[0049] The direction of use sensor may comprise a microcontroller configured to detect the electrical characteristic, in particular the voltage between two conductive elements, in particular between two electrical contacts or between an electrical track and an electrical contact.

[0050] The first and second parts may each comprise one or more electrical conduction elements forming electrical connections dependent on the position and / or orientation of the first part and the second part with respect to each other, in particular being able to take at least two different electrical connection configurations depending on the position and / or orientation of the rotary attachment, in particular of the first and second parts of the sensor with respect to each other, corresponding to at least the first and second directions of use of the handpiece.

[0051] The first and second parts may each comprise one or more electrical conduction elements, one of the electrical conduction elements of one of the first and second parts being connected to a non-zero electrical supply, in particular to the mains, and at least one other electrical conduction element of one of the first and second parts constituting an electrical detection electrode. In a range of positions and / or orientations of the first and second parts with respect to each other, electrical conduction elements of the first and second parts may be in contact with each other so that there is electrical continuity between the conduction element connected to the electrical supply and the electrical detection electrode. Outside of said range, there is no electrical continuity between these two elements.It is then possible to identify by simple electrical measurement the positioning of the first part and the second part outside or within the range of positions and / or orientations.

[0052] A plurality of electrically conductive elements each of one of the first and second parts may constitute electrically detecting electrodes. Each electrode may be - electrically connected to the conductive element connected to the non-zero electrical supply in a range of positions and / or orientations of the first and second parts with respect to each other and - not connected to the conduction element connected to the power supply outside this range.

[0053] The ranges of positions and / or orientations of the first and second parts associated with each other with the electrodes may be different. It is then possible by electrical measurement on several electrodes to refine the detection of the position and / or orientation of the first part and the second part with each other by detecting the electrodes electrically connected to the power supply and those which are not, knowing for each the associated range of position or orientation.

[0054] One of the first and second parts of the sensor, preferably the first part, may comprise at least one electrical contact, better still two electrical contacts, even better three electrical contacts, and the other of the first and second parts, preferably the second part, of the sensor may comprise an electrical track. Preferably, the or each electrical contact is in contact with the electrical track in at least one range of positions and / or orientations of the first part relative to the second part. The ranges of positions and / or orientations of the first part relative to the second part associated with each electrical contact may be different. They may be disjoint or at least partially overlap. Each range of positions and / or orientations may correspond to one of the directions of use.

[0055] The electrical track may extend around the periphery of the first or second part in an arc of a circle.

[0056] The electrical track may extend over an angular range of between 90° and 210°, in particular between 120° and 180°. In the case of a plurality of electrical contacts, the electrical contacts may be positioned on a circle of substantially the same diameter. The adjacent electrical contacts may in particular be separated from each other by an angle of between 60° and 200°.

[0057] The electrical contacts may extend over the first or second part over an angular extent of between 10° and 90°, in particular between 10° and 20°.

[0058] The or at least one of the electrical conduction elements of the first part, in particular the or one of the electrical contacts or the electrical track, can be arranged on the first part substantially centered in the plane extending between the jaws in the closed configuration of the jaws and the or at least one of the electrical conduction elements of the first part, in particular the or one of the electrical contacts or the electrical track, can be arranged on the second part substantially centered in a vertical plane when the device is used, in particular in a median plane of the bent portion of the cord near the handpiece.

[0059] The first portion may be symmetrical about a median plane transverse to the plane extending between the jaws in the closed configuration of the jaws of the handpiece.

[0060] In one embodiment, one of the first and second parts of the direction of use sensor, preferably the first part, comprises at least two electrical contacts, in particular three, one of the electrical contacts is connected to a non-zero electrical supply, the other contact(s) being unpowered. In this case, the electrical track is not powered with electricity and the electrical characteristic is measured on the unpowered contact(s) relative to the electrically powered contact. When the electrical characteristic, in particular the voltage, measured is non-zero on the or one of the unpowered electrical contacts, this indicates that the handpiece is being used in one of the first and second directions of use. Otherwise, this indicates that the handpiece is being used in the other of the first and second directions of use.

[0061] In one embodiment, one of the first and second parts of the direction of use sensor, preferably the first part, comprises at least two contacts electrical, in particular three, not powered. In this case, the electrical track is powered with electricity and the electrical characteristic is measured on the contacts relative to the electrically powered track. When the electrical characteristic, in particular the voltage, measured at each contact is according to a first electrical configuration, this indicates that the handpiece is used in one of the first and second directions of use. When the electrical characteristic, in particular the voltage, measured at each contact is according to a second electrical configuration different from the first by at least one voltage measured at one contact, this indicates that the handpiece is used in the other of the first and second directions of use.

[0062] In one embodiment, one of the first and second parts of the direction of use sensor, preferably the first part, comprises a single electrical contact, one of the electrical contact and the metal track being supplied with electricity and the other not being supplied with electricity. When the electrical characteristic is non-zero, this indicates that the electrical contact is in contact with the electrical track and that the handpiece is being used in one of the first and second directions of use. Otherwise, this indicates that the handpiece is being used in the other of the first and second directions of use.

[0063] The microcontroller can be configured to detect the electrical characteristic only when the jaws are in the closed configuration, in particular when the jaw configuration detection member detects a closed configuration of the latter.

[0064] For example, when the jaws are in the open configuration, the electrical contacts are not powered, which does not allow the microcontroller to detect the electrical parameter.

[0065] Alternatively, the electrical contacts are constantly powered when the device is in operation, the direction of use sensor being configured not to transmit the information when the jaws are in the open configuration.

[0066] The part comprising the electrical contacts may comprise a support for the electrical contacts made of an electrically insulating material, said electrical insulator being crossed by the electrical contacts, the part of the electrical contacts extending on one side of the support being configured to extend in contact with the metal track in at least one orientation of the handpiece relative to the cord, the part of the electrical contacts extending on the other side being configured to be electrically connected to a microcontroller measuring the electrical parameter, in particular a voltage on at least one electrical contact, in particular on the non-powered electrical contacts.

[0067] The direction of use sensor may be a binary sensor configured to discriminate between the first and second directions of use. Optimal direction

[0068] The device may include a processor configured to determine the direction of use among at least the first and second direction of use of the handpiece from the data representative of the direction of use of the direction of use sensor, in particular from the voltage data or data detected by the microcontroller, and generate information on the direction of use.

[0069] When the handpiece comprises two jaws connected to each other and capable of taking an open configuration for engaging the hair between them and a closed configuration for treatment, the processor can be configured to determine the direction of use only when the jaws are in the closed configuration.

[0070] The processor may be configured to transmit the generated direction of use information to a user alert device to which the device is connected or forming part of the device.

[0071] The device may comprise a user alert member configured to receive information on the direction of use of the handpiece and emit, for at least one direction of use, a user alert, in particular a signal perceptible by the user, in particular audible, visual or haptic depending on the direction of use.

[0072] The user alert member may be included in or on the handpiece.

[0073] The user alerting device may alternatively be separate from the handpiece. For example, the user alerting device may be a phone or tablet connected via a wireless connection to the processor.

[0074] The user alert emitted by the user alert member may correspond to one of the first and second directions of use, in particular to a degraded direction of use among the first and second directions of use.

[0075] In this way, the user is quickly warned if he is using the device in the degraded direction of use, which allows him to correct his use to move the handpiece in the optimal treatment direction. The device thus makes it possible to simplify the use of the device, to make it more intuitive and ergonomic. Additional processing body

[0076] The device may comprise an additional processing member, notably chosen in the group consisting of steam applicators, cosmetic product applicators, combs or brushes, and a combination thereof.

[0077] The application of steam can be carried out by a series of orifices, in particular aligned along the longitudinal axis of the handpiece.

[0078] The handpiece may comprise two jaws connected to each other and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration, the additional treatment member being mounted at least on one of the jaws and extending at least partially between the two jaws.

[0079] The additional treatment member can be arranged on the handpiece, in particular on one of the jaws, asymmetrically relative to a median plane, in particular transverse to a median plane extending between the jaws in the closed configuration of the jaws. The additional treatment member can be arranged on the handpiece so that it treats the hair upstream of the plate(s) in one direction of use and downstream of the plate(s) in another direction of use. The upstream treatment by the additional treatment member then advantageously constitutes the preferred direction of use of the device.

[0080] The additional treatment member can be positioned laterally on the handpiece, in particular laterally on one of the jaws. Process

[0081] The invention also relates, according to another of its aspects, independently or in combination with the above, to a method for treating hair, in particular for straightening or curling, by moving a handpiece of a device, in particular as described above, along a lock of hair, a method comprising, during the movement of the device along the lock of hair from the roots to the tips:

[0082] - determining the direction of use of the handpiece of the device at least among a first and a second direction of use in which the bit moves from a front face to an opposite rear face of the handpiece and a second direction of use in which the bit moves from said rear face to the opposite front face of the handpiece, from data from a sensor of the direction of use positioned in a rotatable attachment of a power cord of the device to the handpiece,

[0083] - the device taking one configuration from among at least two configurations different depending on the direction of use determined.

[0084] The first direction of use may be an optimal direction of use for performing the treatment along the strand of hair optimally, and the second direction of use may be an opposite degraded direction of use.

[0085] The configuration taken by the device may be an alert configuration perceptible by the user when one of the first and second directions of use is determined.

[0086] Alternatively, the configuration taken by the device may be a particular operating configuration linked to the direction of use, in particular a degraded operating configuration in the case of a non-recommended direction of use.

[0087] The data from the direction of use sensor may be the position or rotation of the rotary attachment relative to the handpiece, in particular rotating substantially around the longitudinal axis of the handpiece, or an axis forming an angle not per pendicular to the longitudinal axis of the handpiece.

[0088] The rotary attachment can take a position or rotation corresponding to an optimal direction of use to carry out the treatment along the lock of hair in an optimal manner or a position or rotation corresponding to a degraded direction of use, in particular the opposite direction.

[0089] The device can take the alert configuration when the position or rotation corresponding to the direction of use is degraded.

[0090] When the device is in use, the user orients the handpiece by rotating it about its longitudinal axis, which changes the relative position between the handpiece and the power cord by rotation of the rotary attachment due to the force of Earth's gravity.

[0091] By "orients the handpiece", we mean that the user modifies the inclination relative to the terrestrial horizontal of the handpiece around its longitudinal axis.

[0092] The orientation of the handpiece is advantageously representative of the direction of use of the handpiece. In particular, each direction of use corresponds to an orientation or a range of orientations, the orientations or ranges of orientations being different and not totally superimposed between the different directions of use. The position or rotation of the rotary attachment is thus characteristic of the direction of use of the handpiece. This range of orientations can be between 20° and 200°, in particular between 60° and 100°.

[0093] The device can emit in the alert configuration a signal perceptible by the user, in particular audible, visual or haptic.

[0094] The device may comprise two jaws capable of assuming a jaw-apart configuration and a jaw-closed configuration, in which method the device may assume the alert configuration only when said jaws are in the close configuration.

[0095] The device may comprise a jaw configuration detection member configured to detect whether the jaws are in the closed or open processing configuration, in particular a Hall effect sensor, an electrical contactor, an optical contactor, preferably a Hall effect sensor.

[0096] The method may comprise a step of determining the detection of the configuration of the jaws.

[0097] Preferably, the determination of the direction of use is carried out only if the detected configuration is the closed configuration.

[0098] The method may include treatment of the hair on an internal treatment surface of the handpiece, in particular a thermal treatment surface, in particular a heating plate.

[0099] The method may comprise treatment of the hair on a surface of external treatment of the handpiece, in particular thermal, in particular a heating plate.

[0100] The method may include additional treatment, including steam application, cosmetic product application, and / or combing. Brief description of the drawings

[0101] The invention may be better understood by reading the detailed description which follows, non-limiting examples of its implementation, and by examining the attached drawing, in which

[0102] [Fig-1] [Fig.l] illustrates, in side view, an example of a device, in a confi closed structure, according to the invention,

[0103] [Fig.2] [Fig.2] illustrates, in perspective, the device of [Fig.l] in an open configuration,

[0104] [Fig.3] [Fig.3] illustrates, in perspective, the rotary attachment of the device of [Fig.l] extracted from the handpiece of the device,

[0105] [Fig.4] [Fig.4] illustrates, in perspective, a part of the rotary attachment of the [Fig.3] mounted in a part of the device,

[0106] [Fig 5a] [Fig 5a] illustrates, schematically, in top view, an example of use of the device,

[0107] [Fig 5b] [Fig 5b] illustrates, schematically, in side view, the orientation of the device in the example of use of [Fig 5a],

[0108] [Fig 5c] [Fig 5c] illustrates, schematically, in side view, the orientation of the rotary attachment in the example of use of figures 5a and 5b,

[0109] [Fig 6a] [Fig 6a] illustrates, schematically, in top view, another example of use of the device,

[0110] [Fig 6b] [Fig 6b] illustrates, schematically, in side view, the orientation of the device in the example of use of [Fig 6a],

[0111] [Fig 6c] [Fig 6c] illustrates, schematically, in side view, the orientation of the rotary attachment in the example of use of figures 6a and 6b,

[0112] [Fig.7] [Fig.7] illustrates, schematically and in perspective, a variant of the rotary attachment extracted from the handpiece of the device,

[0113] [Fig.8] [Fig.8] illustrates, schematically, another variant of the rotary attachment, and

[0114] [Fig.9] [Fig.9] illustrates, schematically and in perspective, another variant of the rotary attachment extracted from the handpiece of the device. Detailed description

[0115] In the remainder of the description, elements that are identical or have identical functions bear the same reference sign. For the purposes of conciseness of this description, they are not described with respect to each of the figures, only the differences between the embodiments being described.

[0116] In the figures, the actual proportions have not always been respected, for the sake of clarity.

[0117] Figures 1 to 6c illustrate a first example of device 1 according to the invention, in this example for straightening hair.

[0118] This device 1 has a handpiece 2 comprising two jaws 3 and 4 movable relative to each other between an open configuration, visible in [Fig.2], for introducing a lock of hair between them and a closed treatment configuration, illustrated in [Fig.l].

[0119] The jaws 3 and 4 are carried by respective upper 5 and lower 6 arms, which are, in the example considered, connected to each other at one of their ends by an articulation 8, the handpiece 2 thus forming a clamp.

[0120] The arms 5 and 6 define, between the articulation 8 and the jaws 3 and 4, respective half-handles 10 and 11 on which the user can press to bring the jaws 3 and 4 together and thus pinch the hair extending between the two jaws.

[0121] The width of the arms 5 and 6 at the half-handles 10 and 11 is less than that at the jaws 3 and 4.

[0122] The jaws 3 and 4 each have a convex outer surface and a substantially flat inner surface.

[0123] An elastic return member (not visible) is preferably provided to return the jaws 3 and 4 to the separated configuration, this elastic return member being for example a spring arranged around or close to an axis of the articulation 8.

[0124] The invention is not limited to a particular way of connecting the arms 5 and 6 together and the jaws 3 and 4 can be made mobile in other ways without departing from the scope of the present invention. However, the presence of an articulation is largely preferred for the ergonomics it provides.

[0125] The handpiece 2 extends, for example, along a longitudinal axis X.

[0126] The jaw 3 extends, for example, along a longitudinal axis Yl.

[0127] The jaw 4 extends, for example, along a longitudinal axis Y2.

[0128] The device 1 may comprise a water reservoir 7 for producing steam, in particular in the handpiece 2. As can be seen in [Fig.l], the reservoir 7 is preferably integrated into the handpiece 2 and in particular in one of the arms 5, 6. Advantageously, the reservoir 7 is integrated into the arm 6 comprising the steam outlet 21 which will be detailed later. This makes it possible to have a particularly compact device 1 with a relatively simple internal construction. However, other locations of the reservoir 7 could be imagined, for example in the other arm 5, or even completely remote from the handpiece 2 without departing from the scope of the invention.

[0129] A user interface, not shown in the figures, may be present on the device 1, in particular on the handpiece 2, to allow the user to control the operation of the device 1. Heating plates

[0130] The handpiece 2 comprises an internal heating surface 14 for the hair to be treated on each of the two jaws 3 and 4 facing the other of the jaws, and facing each other in the close configuration of the jaws 3 and 4 so as to define between them a heated treatment zone in the close configuration of the two jaws 3 and 4. The two internal heating surfaces 14 are, for example, configured to pinch between them the hair extending between the two jaws 3 and 4 in the close configuration of the two jaws 3 and 4.

[0131] The two internal heating surfaces 14 are substantially flat, but it could be otherwise. They could be of complementary wavy shapes or of complementary curved shapes for example.

[0132] The internal heating surfaces 14 are, in the example illustrated, formed by the contact surface of internal plates 16 made of a heat-conducting material, each extending over one of the jaws. Each internal plate 16 constitutes an internal treatment member of the device.

[0133] In a variant not illustrated, only one of the jaws 3 or 4 can carry an internal plate 16 having a heating contact surface opposite a counter-support surface of the other jaw 3 or 4. The counter-support surface can be formed by the body of the jaw or by an element attached to the jaw.

[0134] The handpiece 2 may comprise a detection member, not shown, of the configuration of the jaws 3 and 4 configured to detect whether the jaws 3 and 4 are in the closed treatment configuration or open, in particular a Hall effect sensor.

[0135] As illustrated, the plates 16 can be offset laterally on the jaws 3 and 4, i.e. not centered on the axes Y1 and Y2. Thus, the handpiece 2 is asymmetrical relative to the median plane P of the jaws 3 and 4 perpendicular to the internal heating surfaces 14 when in the closed configuration. Additional processing body

[0136] In the examples illustrated, the device 1 comprises an additional hair treatment member 12 extending from the jaw 4, towards the other jaw 3 in a close configuration of the two jaws 3 and 4, and arranged on said jaw 4 laterally with respect to the internal plate 16.

[0137] Jaw 3 is for example devoid of additional treatment.

[0138] The member 12 extends longitudinally and parallel to the longitudinal axis Y2 of the jaw 4 along an edge 13 of the internal plate 16 of the jaw 4 while being disjointed from this internal plate 16, when the device 1 is observed along its longitudinal axis X.

[0139] The jaw 4 may be devoid of an additional treatment member on the side of an edge 15 of the internal plate 16 opposite the edge 13. This increases the asymmetry of the handpiece 2 relative to the median plane P.

[0140] The member 12 may comprise a steam outlet 21 and / or a comb 22, as illustrated in FIGS. 1 and 2.

[0141] The comb 22 can be arranged, preferably in a removable manner, in a housing such as a longitudinal groove 23, visible in [Fig. 2]. The user can thus change or remove, if necessary, the comb 22.

[0142] The groove 23 may have a rectangular cross-section and open at the distal end of the jaw 4.

[0143] The comb 22 may comprise, in the distal part of the device 1, an element 24 making it possible to grip the comb 22 when it is introduced into the groove 23 or extracted from it.

[0144] The comb 22 may extend, for example, over the entire length of the guide portion. Alternatively, it could extend over only a portion of the guide portion.

[0145] The steam treatment can be provided by a vaporization member consisting of a heating element, an evaporation chamber supplied with water by a reservoir located in an arm of the device, or alternatively by a remote reservoir. The device can comprise an electrically driven pump, preferably peristaltic, taking the water to be sent to the device 1 from a water reservoir. The pump is for example as disclosed in publication FR 2 967 018. The evaporation chamber can be produced in accordance with the teaching of application EP 2449909Al or otherwise.

[0146] The evaporation chamber can be arranged on one of the arms, namely the lower arm 6 in the example considered, and the steam outlet 21 is provided on the same arm 6.

[0147] The steam outlet 21 may be in the form of a ramp, elongated in a direction parallel to the longitudinal axis Y2.

[0148] The ramp may comprise several steam projection orifices, for example between 4 and 10 orifices, preferably 7, which are preferably equally distributed along the ramp and each with an axis oriented substantially perpendicular to the median treatment plane.

[0149] The vaporization member is electrically powered and a temperature sensor is advantageously arranged in the evaporation chamber. The device is designed to maintain the temperature of the evaporation chamber at a value between 110°C and 130°C.

[0150] The teeth of the comb 22 may be of rectangular cross-section. Direction of use

[0151] As mentioned previously, the handpiece 2 is preferably asymmetrical relative to the median plane P of the jaws 3 and 4 perpendicular to the internal heating surfaces 14 when in the closed configuration.

[0152] When treating hair with the illustrated device, as will be described in more detail below, the hair is clamped between the jaws 3 and 4 and the handpiece 2 is moved along the strand of hair.

[0153] Thus, the asymmetry relative to the plane P leads to an asymmetrical treatment of the hair.

[0154] The handpiece 2 can be used in two or four directions of use:

[0155] - The first direction of use leads to the completion of the successive steps following, jaw 4 being under jaw 3: combing, steam application and heating.

[0156] - The second direction of use leads to the completion of successive steps following, jaw 4 being under jaw 3: heating, steam application and combing.

[0157] - The third direction of use leads to the completion of successive steps following, jaw 4 being above jaw 3: combing, steam application and heating.

[0158] - The fourth direction of use leads to the completion of successive steps following, jaw 4 being above jaw 3: heating, steam application and combing.

[0159] The first and third treatments are carried out from a front face F1 to an opposite rear face F2; the second and fourth treatments are carried out from the rear face F2 to the front face FL.

[0160] The first and third directions of use perform substantially the same treatment of the hair and the second and fourth directions of use perform substantially the same treatment of the hair.

[0161] The first and third directions of use are said to be optimal, in the sense that the quality of the treatment is better than that obtained with the other two directions of use, the combing taking place before the application of steam and the heating. Indeed, this makes it possible to clearly separate 3 key stages for the treatment and shaping of the hair. In a first step, the hair is combed and well oriented and distributed over the entire treatment width by the comb. In a second step, separate from the first, the hair is treated with steam, which allows it to be slightly moistened management to protect them and prepare them well for the heat treatment that will follow. In a third step, distinct from the two previous ones, the hair is treated thermally and mechanically, thanks to the combination of the temperature of the plates 16 and the pressure exerted by the clamp formed by the arms 5, 6. This succession of 3 steps leads to an excellent hairdressing result while preserving the health of the hair. It is then understood that using the device in a different direction, in this case according to the second and fourth directions of use, is not desirable because it does not lead to the best result.

[0162] To visually guide the user to use the handpiece in the first direction, the handpiece 2 may include arrows 25 indicating the optimal direction to the user. Power cord

[0163] The device 1 comprises a cord 17 designed to be able to provide the energy necessary for the operation of the device. The cord 17 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 (water for example).

[0164] The cord 17 comprises, at its end connected to the handpiece 2, an angled portion 19 between a first part 17a of the cord 17, preferably connected in a rotatable manner to the handpiece 2, and a second part 17b, fixedly connected to the power supply. The angled portion 19 forms a branch angle a of approximately 45° between the parts 17a and 17b. The angled portion 19 has a median plane located in a vertical plane.

[0165] The cord 17 has a rotary attachment 18 relative to the handpiece.

[0166] The rotary attachment 18 makes it possible to rotate the cord 17 around an axis of rotation R, which facilitates the handling and use of the device by avoiding the formation of knots or twists on the cord 17 when using the device.

[0167] The rotary attachment 18 is configured so that the rotational movement of the handpiece 2 is substantially independent of the rotation of the cord 17.

[0168] In particular, thanks to the bent portion 19 and the rotary attachment, the cord 17 tends to maintain its orientation with respect to the ground, that is to say that the second part 17b will be kept downwards with respect to the vertical in a manner analogous to a pendulum, simply under the effect of its own weight. The orientation of the cord 17 is advantageously maintained substantially vertical, even when the handpiece 2 is rotated around its longitudinal axis.

[0169] The axis of rotation R may be substantially parallel, or even parallel, with the longitudinal axis X of the handpiece 2. Direction of use sensor

[0170] The device 1 also comprises a sensor 30 for rotation and / or position of the rotary attachment 18 positioned in the rotary attachment 18 of the cord 17. The sensor 30 is configured to provide information on the direction of use of the handpiece 2.

[0171] As visible in [Fig.3], the sensor 30 comprises a first part 31, fixed relative to the handpiece 2, and a second part 32, fixed relative to the cord 17.

[0172] The first and second parts 31 and 32 are movable relative to each other in rotation around the axis R.

[0173] The first part 31 comprises, mounted in a support 33 made of an electrically insulating material, three electrical contacts 34a to 34c not supplied with electricity.

[0174] The contacts 34a to 34c are arranged around a circle of the same diameter on a first side 40 of the support 33. The angular separation between an adjacent unpowered contact 34 is for example 90°.

[0175] The contacts 34a and 34b are positioned on the handpiece 2 opposite each other in a plane extending substantially between the jaws 3 and 4 when in the closed configuration.

[0176] The contact 34c is positioned on the handpiece 2 in the median plane P on the side of the jaw 3.

[0177] In other words, assuming that the top of the handpiece 2 is on the side of the jaw 3, and that the bottom of the handpiece 2 is on the side of the jaw 4 carrying the additional treatment member 12, the contacts 34a and 34b are on the sides and the contact 34c is at the top.

[0178] The second part 32 comprises an electrical track 41 in an arc of a circle, for example over an extent of 180°. In this example, the track 41 is supplied with electricity.

[0179] The electrical track 41 is positioned on the top of the second part 32, opposite the direction of derivation of the second part 17b of the cord 17, that is to say at the top with respect to the vertical.

[0180] Each contact 34a to 34c is connected to a pin 36 which passes through the support 33 to open on one side 42 thereof. The ends 37 of the pins 36 on the side 42 are electrically connected to a microcontroller, not shown for the sake of clarity.

[0181] The pins 36 of the contacts 34a and 34b are connected to these contacts via arc-shaped connections 38.

[0182] The electrical track 41 is also connected to a pin 43 which passes through the support 33 to open on the side 42 thereof. The end 44 of the pin 43 on the side 42 is electrically connected to the microcontroller, not shown for the sake of clarity, to measure the voltage between the electrical track 41 and each of the contacts 34a to 34c.

[0183] The power supply of the electrical track 41, not shown, is at a voltage of 5V.

[0184] The angular extent of the contact 34c is for example greater than that of the contacts 34a and 34b.

[0185] The track 41 being fixed relative to the second part 32, it is movable in rotation relative to the electrical contacts 34a to 34c around the axis R.

[0186] Depending on the angular position of the rotary attachment, the track 41 may or may not be in contact with the contacts 34a to 34c and the contact(s) 34a to 34c with which it is in contact depend on the directions of use indicated previously.

[0187] To illustrate the operation of the sensor 30, Figures 5a to 5c show the use of the handpiece 2 in the first direction and Figures 6a to 6c show the use in the second direction. As explained, the treatment of the hair C is done from the root Ra to the tips Po by moving in a direction D.

[0188] In figures 5a to 5c and 6a to 6c, the visualization of the relative position between the track 41 and the contacts is done by looking at the handpiece 2 from the side of the cord 17 in a direction A.

[0189] As visible in the figures, when the device is used, the median plane T extending between the jaws 3 and 4 forms a non-zero angle [3 with the horizontal H.

[0190] As can be seen, in the first direction of use of Figures 5a to 5c, the electrical track 41 is in contact with the contacts 34a and 34c. The contact 34b is not in contact with the track 4L.

[0191] The microcontroller can therefore measure a positive voltage on contacts 34a and 34c and a zero voltage on contact 34b.

[0192] Conversely, in the second direction of use of figures 6a to 6c, the electrical track 41 is in contact with the contact 34c and with the contact 34b. The contact 34a is this time not in contact with the track 4L

[0193] The microcontroller can therefore measure a positive voltage on contacts 34b and 34c and a zero voltage on contact 34a.

[0194] In the event, not shown, where the handpiece is used with an orientation at 180° relative to those of figures 5a to 5c and 6a to 6c, corresponding to the third and fourth directions of use described previously, the contact 34c is no longer in contact with the track 41, the contact 34b is in contact with the track 41 in the third direction of use and the contact 34a is in contact with the track 41 in the fourth direction of use.

[0195] Thus, depending on the voltage measured on the electrical contacts 34a to 34c, the microcontroller can provide data representative of the orientation of the handpiece with respect to the horizontal. The orientation being characteristic of the direction of use, in particular the orientation ranges, as has just been illustrated, the microcontroller can provide data representative of the direction of use of the handpiece 2. These data are then processed by a processor, not illustrated, which can deduce from the sensor data information on the direction of use, in particular determine that handpiece 2 is used in the optimal direction of use, here the first and third directions of use.

[0196] The device 1 may comprise a user alert member, not visible in the figures, configured to receive information on the direction of use of the handpiece 2 and to emit, for at least one direction of use, in particular for a direction different from the optimal direction of use, a user alert, in particular a signal perceptible by the user, in particular audible, visual or haptic.

[0197] Figures 7 to 9 illustrate variants of the sensor 30.

[0198] In the variant of [Fig.7], track 41 is not supplied with electricity but it is contact 34c which is supplied with electricity, in particular at a voltage of 5 V. Track 41 thus makes it possible to make an electrical bridge between contact 34c and contacts 34a or 34b, when the two contacts are in contact with track 4L

[0199] In this embodiment, the determination of the orientation range of the rotary attachment 18 is done by measuring the voltage on the contacts 34a and 34b.

[0200] The two opposite measuring contacts 34a and 34b are substantially along the median plane P and the powered contact 34c is along the longitudinal plane extending between the jaws in the closed configuration. The contact 34a is on the side of the jaw 4 and the contact 34c is on the side of the comb 22.

[0201] In this variant, in the first direction of use, the voltage on contact 34b will be positive and the voltage on contact 34a zero.

[0202] In the second direction of use, the voltage on contacts 34a and 34b will be negative.

[0203] In the third direction of use, the voltage on contact 34a will be positive and the voltage on contact 34a zero.

[0204] In the fourth direction of use, the voltage on contacts 34a and 34b will be zero. It is thus possible to determine the directions of use leading to substantially the same optimal treatment of the directions of use leading to a different degraded treatment by adapting the positioning of the sensors.

[0205] In the variant of [Fig.8], the angular distance between the contacts 34a to 34c, taken at the center of the contacts, is smaller, for example equal to 45°.

[0206] Similarly, the electrical track has an angular extent of 90°.

[0207] In the variant of [Fig.9], the first part comprises a single unpowered contact 34 and the second part comprises an electrical track 41 powered with electricity, in particular connected to the mains.

[0208] The contact 34, on the handpiece 2, extends in a plane passing between the jaws 3 and 4 when in the closed configuration.

[0209] The track 41 has an angular extent of 180° and is positioned on the side of the cord 17. Thus, the ends of the track 41 are included in a vertical plane.

[0210] Thus, in this embodiment, the microcontroller determines that the handpiece is used in a first direction when a positive voltage is measured on the contact 34, i.e. when one of the lateral edges of the jaws is higher than the other, in particular the one far from the comb and / or the steam outlets, or is used in another direction when a zero or neutral voltage is measured on the contact 34, i.e. when the other lateral edge of the jaws is higher, in particular the one close to the comb and / or the steam outlets. In this case, the two directions of use correspond to different treatments.

[0211] The angular extension of the electrical track 41 thus determines the orientation ranges of the first and second determined directions of use.

[0212] In the following, an example of a method for treating hair according to the invention with the device 1 is described.

[0213] In this example, the processing to be performed is smoothing. In a variant, the processing to be performed is looping.

[0214] In a first step, the device 1 is powered up by connecting the cord 17 to a mains socket.

[0215] In a second step, the user positions a lock of hair between the jaws 3 and 4, these being in the open configuration. The handpiece 2 is notably positioned close to the hair root.

[0216] The user then puts the jaws 3 and 4 into the closed configuration in a third step.

[0217] When in the closed configuration, the jaw configuration detection member 3 and 4 detects it and sends a signal either to the alert member or to the sensor 30 so that the detection of the direction of use begins.

[0218] The signal could also be transmitted to any other logic unit of the device, as long as this logic unit is capable of starting the detection of the direction of use.

[0219] Before this signal from the detection member, the detection of the direction of use is not made.

[0220] In this step, the user has oriented the handpiece 2 by modifying its inclination with respect to the terrestrial horizontal H, as has been explained, this generates a position, rotation and / or orientation of the rotary attachment.

[0221] In a fourth step, which follows the third step, the sensor 30 determines the direction of use.

[0222] This detection is done by the microcontroller measuring the voltage on the contact(s) 34.

[0223] Based on these measurements, the sensor determines a direction of use from among at least two directions.

[0224] The sensor 30 then transmits information on the direction of use of the handpiece 2 to the alert member.

[0225] If the direction of use is the optimal direction, it may be provided that the alert member does not emit a signal perceptible by the user.

[0226] If the direction of use is a degraded direction, it may be provided that the alert member emits a signal perceptible by the user, for example visual, audible, haptic or a combination of these.

[0227] It could also be envisaged to proceed inversely, that is to say with a signal perceptible during use according to the optimal direction, and no signal according to the other directions.

[0228] It could also be envisaged to have a signal perceptible for all directions of use, the signal being different if the direction of use is the optimal direction or a degraded direction.

[0229] In the event that the user has been warned of an incorrect direction of use, the method may include a step of correctly reorienting the handpiece 2 on the hair.

[0230] Once in the correct orientation allowing the use of the handpiece 2 in the optimal direction of use, the handpiece 2 is moved along the hair from the root to the tips so as to carry out, for a given area of ​​the lock of hair, the following steps: combing, application of steam and heating.

[0231] The invention is not limited to the examples which have just been described.

[0232] The number of processing steps, the type of processing, and the order of processing may be different.

[0233] The method may include a step of applying a cosmetic product.

[0234] The handpiece may include external heating surfaces to provide a curling by wrapping the hair around the handpiece and / or one or more jaws.

[0235] The angular difference between two contacts can be different, for example between 20° and 200°.

Claims

Claims

1. Device (1) for treating hair, in particular for curling and / or straightening hair, comprising: - a handpiece (2) capable of treating a lock of hair by moving along a lock of hair from a root to a tip, the device (1) having during treatment a first direction of use in which the lock moves from a front face to an opposite rear face of said device and a second direction of use in which the lock moves from said rear face to the opposite front face, the two directions of use corresponding to different orientations of the handpiece (2); - an at least electrical power cord (17) having an attachment (18) to the handpiece rotatable relative to the handpiece (2);- a direction of use sensor (30) configured to provide data representative of the direction of use of the handpiece (2) at least among the first and second directions of use, said sensor (30) being positioned in the rotary attachment (18) of the power cord (17) to the handpiece (2).;

2. Device (1) according to the preceding claim, in which the handpiece (2) comprises two jaws (3, 4) connected to each other and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration.

3. Device (1) according to any one of the preceding claims, in which the handpiece (2), in particular at least one of the jaws (3, 4), may comprise at least one internal treatment member (16) comprising an internal treatment surface configured to come into contact with or opposite a part of the lock of hair during the treatment.

4. Device (1) according to any one of the preceding claims, in which the handpiece (2) is elongated along a longitudinal axis (X) and is asymmetrical along at least one longitudinal median plane (P) extending between the front (F1) and rear (F2) faces of the handpiece (2).

5. Device (1) according to any one of the preceding claims, in which the sensor (30) of the direction of use is a sensor of the position or rotation of the rotating attachment (18) of the cord (17). power supply relative to the handpiece (2), the data representative of the direction of use being able to correspond to a position included in a range of positions of the power supply cord (17) relative to the handpiece (2) among at least two predetermined distinct position ranges corresponding respectively to the first and second directions of orientation, a rotation of the rotary attachment (18) included in a range of rotations of the power supply cord relative to the handpiece (2) among at least two predetermined distinct rotation ranges and / or an orientation in a range of orientations of the rotary attachment (18) of the power supply cord (17) relative to the handpiece (2) among at least two predetermined distinct orientation ranges.

6. Device (1) according to any one of the preceding claims, in which the cord (17) has an angled portion (19) at its end connected to the handpiece (2).

7. Device (1) according to any one of the preceding claims, in which the sensor (30) of the direction of use comprises a first part (31) fixed relative to the handpiece (2) and a second part (32) fixed relative to the cord (17), the sensor (30) being configured to determine the position, rotation and / or orientation of the first part (31) relative to the second part (32), or vice versa, the first and second parts (31, 32) comprising electrical connection elements (34a, 34b, 34c, 41) configured between them to have at least one or more different electrical characteristics in two ranges of positions and / or orientations of the rotary attachment (18) corresponding respectively at least to the first and second direction of use, the electrical characteristic(s) being able to comprise a voltage, an intensity or a resistance,the sensor (30) of the direction of use comprising a microcontroller configured to detect the electrical characteristic.,

8. Device (1) according to claim 7, wherein the first and second parts (31, 32) each comprise one or more electrical conduction elements (34a, 34b, 34c, 41), one of the electrical conduction elements (34a, 34b, 34c, 41) of one of the first and second parts (31, 32) being connected to a non-zero electrical supply, in particular to the mains, and at least one other electrical conduction element (34a, 34b, 34c, 41) of one of the first and second parts (31, 32) constituting a detection electrode electric.

9. Device (1) according to any one of the preceding claims, comprising a processor configured to determine the direction of use among at least the first and the second of the handpiece (2) from the data representative of the direction of use of the sensor (30) of the direction of use, in particular from the voltage data or data detected by the microcontroller, and generate information on the direction of use.

10. Device (1) according to the preceding claim, in which the handpiece (2) comprises two jaws (3, 4) connected together and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration, the processor being configured to determine the direction of use only when the jaws (3, 4) are in the closed configuration.

11. Device (1) according to the preceding claim, in which the processor is configured to transmit the generated direction of use information to a user alert member to which the device (1) is connected or forming part of the device (1).

12. Device (1) according to any one of the preceding claims, comprising a user alert member configured to receive information on the direction of use of the handpiece (2) and to emit, for at least one direction of use, a user alert, in particular a signal perceptible by the user, in particular audible, visual or haptic depending on the direction of use.

13. Device (1) according to the preceding claim, the user alert emitted by the user alert member corresponding to one of the first and the second, in particular to a degraded direction of use among the first and the second direction of use.

14. Device (1) according to any one of the preceding claims, comprising an additional treatment member (12), in particular chosen from the group consisting of steam applicators, cosmetic product applicators, combs, and a combination thereof.

15. Device (1) according to the preceding claim, in which the handpiece (2) comprises two jaws (3, 4) connected to each other and capable of taking an open configuration for engaging the hair between them and a closed treatment configuration, the additional treatment member (12) being mounted on one of the jaws (3, 4) and extending at least partially between the two jaws (3, 4).

16. Device (1) according to one of claims 14 or 15, in which the additional processing member (12) is arranged asymmetrically with respect to a median plane.

17. Method for treating hair, in particular straightening or curling, by moving a device (1), in particular according to any one of the preceding claims, along a lock of hair, method comprising during use of the device (1) from the roots to the ends: - determining the direction of use of a handpiece (2) of the device (1) at least among a first and a second direction of use in which the bit moves from a front face to an opposite rear face of the handpiece and a second direction of use in which the bit moves from said rear face to the opposite front face of the handpiece, from data from a sensor (30) of the direction of use positioned in a rotating attachment (18) of a power cord (17) from the device (1) to the handpiece (2), - The device (1) adopting one of at least two different configurations depending on the direction of use determined.

18.

19. Method according to the preceding claim, in which the data from the sensor (30) of the direction of use are the position or rotation of the rotary attachment (18) relative to the handpiece (2). Method according to claim 17 or 18, wherein the configuration taken by the device (1) is an alert configuration perceptible by the user when one of the first and second directions of use is determined.

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