EP3459386A1 - Rotary blower brush with improved ergonomics - Google Patents

Abstract

Rotary blower (1) of length L comprising a handle (2), a heating means (3), a first motor (4) for driving a compressor (5) and a second motor (6) for driving a brush (5) rotating, the first motor, the heating means and the compressor being positioned in the handle and the second motor for driving the rotating brush outside the handle on a support rod (8) characterized in that the handle comprises two distinct zones of diameters D1 and D2 that are substantially different, the first diameter D1 being substantially greater than the second diameter D2, the zone of diameter D1 housing the compressor (5) and the zone of diameter D2 representing the gripping area (7) of the rotating blower brush.

Description

Object of the invention

The present invention relates to a rotary blower-type hairdressing appliance comprising a handle with two zones of different diameters D1 and D2, the first diameter being substantially greater than the second (D1> D2), the zone of greater diameter D1 housing a compressor for obtaining a substantially constant air flow and a gripping area of diameter D2 allowing a grip more ergonomic compared to the devices of the state of the art.

State of the art

Rotating blower brushes are well known to those skilled in the art. They work like a hairdryer whose handle is coaxial with the hair accessory. This type of apparatus generally comprises a heating means and two motors, one of the two motors for actuating a fan located in the handle and the second motor for rotating the generally removable hairdressing accessory. This second motor can be in the handle or outside the handle.

The documents EP3169182 ; WO2013041805 ; EP2823726 ; EP1576900 ; DE3319402 ; WO2005 / 018372 and US3890984 describe typical rotating fan brushes.

The document JP2004-254897 discloses a rotary blower brush with a first motor arranged in the handle which serves to produce a flow of air and a second motor arranged in the brush for driving the brush in rotation.

The document EP2335515 B1 discloses an electric hairbrush having a handle, a heater, a first fan drive motor and a second rotational drive motor of a hairdressing accessory where the fan and the first motor are included inside the handle and the second motor on the outside of the handle.

The rotating fan brushes of the state of the art, however, all have in common a very bulky and ergonomic handle even when the drive motor of the accessory is located outside thereof. The business trip the second motor out of the handle has already freed a little space for the flow of air but even in this configuration, the handle is still very bulky. This is mainly due to the difficulty of circulating the air through the handle with all the elements necessary for the operation of the device and in particular the often large diameter of the fan which must be in the handle and which sucks the air at one end of the handle to reject it from the other.

The present invention provides a significant improvement in the flow of air flow and ergonomics of use of the apparatus.

Goals of the invention

The present invention aims to overcome the drawbacks of the state of the art by proposing a rotating electric blower having a handle with two substantially different diameters allowing one hand to house a powerful compressor in the wider part and secondly to refine the gripping area of the device as much as possible to improve its ergonomics without sacrificing the functions of the device.

Summary of the invention

The present invention discloses a rotary blower of length L comprising a handle, a heating means, a first motor for driving a compressor and a second motor for driving a rotating brush, the first motor, the heating means and the compressor being positioned in the handle and the second motor for driving the rotating brush located outside the handle inside a support rod, characterized in that the handle has two distinct zones of diameters D1 and D2 substantially different, the first diameter D1 being substantially greater than the second diameter D2, the diameter zone D1 housing the compressor and the diameter zone D2 representing the gripping zone of the rotating blower brush.

• le diamètre D2 est de 10% inférieur au diamètre D1, de préférence de 15% inférieur au diamètre D1 et de manière particulièrement préférée de 20 % inférieur au diamètre D1 ;
• le diamètre D2 de la zone de préhension 7 représente moins de 15% de la longueur totale L, de préférence moins de 12 % et de manière particulièrement préférée moins de 9% ;
• le compresseur 5 maintient un débit sensiblement constant entre 300 et 1000 l/min, de préférence entre 350 et 850 l/min et de manière particulièrement préférée entre 400 et 600 l/min ;
• le rapport entre la puissance du moyen de chauffage en Watt et le débit d'air en l/min est compris entre 1 et 2,5, de préférence entre 1,5 et 2,5 et de manière particulièrement préférée entre 1,5 et 2 ;
• la zone de transition entre le diamètre D1 et le diamètre D2 sur la poignée 2 comporte des ailettes 16 de redressement de flux d'air provenant du compresseur 5 ;
• les deux moteurs (4,6) sont des moteurs sans balais ;
• D1 est compris entre 45 et 60 mm, de préférence entre 48 et 55 mm et de manière particulièrement préférée entre 50 et 54 mm ;
• le diamètre D2 est compris entre 35 et 45 mm, de préférence entre 37 et 43 mm et de manière particulièrement préférée entre 39 et 41 mm ;
• L est compris entre 300 et 400 mm, de préférence entre 320 et 380 mm et de manière particulièrement préférée entre 330 et 360 mm ;
• la poignée comporte un capteur de température à sa sortie asservi à la puissance de chauffe permettant d'éviter la surchauffe de l'appareil ;
• la brosse cylindrique comporte des ouvertures de sortie d'air disposées au moins en partie en cercles concentriques 9, le diamètre de ces cercles diminuant en progressant vers l'extrémité s'éloignant de la poignée 2;
• la poignée 2 comporte un générateur d'ions 14 situé dans le prolongement du moteur 4 du compresseur 5 ;
• la tige-support 8 du moteur 6 comporte un élément de couplage polygonal 10 coopérant avec la brosse cylindrique 17;
• La brosse cylindrique 17 est constituée d'un métal recouvert d'une couche céramique ;
• un senseur de température est placé sur la tige-support pour permettre d'adapter le flux d'air et la puissance de chauffe de l'appareil;
• la brosse comporte un système de détection du type de brosse cylindrique permettant d'adapter le flux d'air, la puissance de chauffe de l'appareil et la vitesse de rotation du moteur.

Preferred embodiments of the invention are recited in the secondary claims and in the figures and include one or more of the following features:

• the diameter D2 is 10% smaller than the diameter D1, preferably 15% smaller than the diameter D1 and particularly preferably 20% smaller than the diameter D1;
• the diameter D2 of the gripping zone 7 represents less than 15% of the total length L, preferably less than 12% and particularly preferably less than 9%;
• the compressor 5 maintains a substantially constant flow rate between 300 and 1000 l / min, preferably between 350 and 850 l / min and particularly preferably between 400 and 600 l / min;
• the ratio between the power of the heating means in Watt and the air flow in l / min is between 1 and 2.5, preferably between 1.5 and 2.5 and particularly preferably between 1.5 and 2;
• the transition zone between the diameter D1 and the diameter D2 on the handle 2 comprises fins 16 for rectifying the flow of air coming from the compressor 5;
• both motors (4,6) are brushless motors;
• D1 is between 45 and 60 mm, preferably between 48 and 55 mm and particularly preferably between 50 and 54 mm;
• the diameter D2 is between 35 and 45 mm, preferably between 37 and 43 mm and particularly preferably between 39 and 41 mm;
• L is between 300 and 400 mm, preferably between 320 and 380 mm and particularly preferably between 330 and 360 mm;
• the handle comprises a temperature sensor at its output controlled by the heating power to prevent overheating of the device;
• the cylindrical brush has air outlet openings arranged at least partly in concentric circles 9, the diameter of these circles decreasing progressing toward the end away from the handle 2;
• the handle 2 comprises an ion generator 14 located in the extension of the motor 4 of the compressor 5;
• the support rod 8 of the motor 6 comprises a polygonal coupling element 10 cooperating with the cylindrical brush 17;
• The cylindrical brush 17 is made of a metal covered with a ceramic layer;
• a temperature sensor is placed on the support rod to allow the air flow and the heating power of the apparatus to be adapted;
• the brush comprises a detection system of the cylindrical brush type to adapt the air flow, the heating power of the device and the rotational speed of the engine.

Brief description of the figures

• The figure 1 represents the flow of air flow around a conventional rotary rotating brush of the state of the art. The outgoing air flow is poorly distributed around the brush and chooses the exit path of least resistance.
• The figure 2 represents the flow of air flow around a rotary rotating brush according to the invention with arrangements of concentric circle openings whose diameter decreases away from the handle. The air flow is thus uniformly distributed around the brush.
• The figure 3 represents a 3D figure of the rotary blower brush according to the invention with its two different handle diameters.
• The figure 4 represents the arrangement of the compressor in the widest part of the handle of diameter D1 and the fins of rectification of the air flow in the transition zone between the diameters D1 and D2 of the handle.
• The figure 5 represents the framework of the apparatus according to the invention with the inner elements but without the cylindrical brush. This representation shows the support rod that leaves the handle supporting the second motor and that allows via a polygonal coupling element to drive the cylindrical brush in rotation.
• The figure 6 is another representation of the apparatus according to the invention seen from the outside.
• The figure 7 shows in detail the arrangement of the compressor in the wide part D1 of the handle.
• The Figures 8 and 9 represent front and rear views of the apparatus according to the invention.
• The Figures 10 and 11 represent a detailed view of the cylindrical brushes with the tufts of bristles that can be fixed to the apparatus according to the invention. The air outlet openings are arranged at least in part in concentric circles whose diameter decreases as one moves away from the handle.
• The figure 12 represents an exploded view of the apparatus according to the invention.
• The figure 13 represents the opening mechanism for cleaning the suction grilles and the filter.
• The figure 14 represents the assembly mechanism of the upper half-shell allowing the swinging of the switch giving the direction of rotation of the accessory.
• The Figures 15 and 16 represent 2 wire winding variants for the heating resistor.
• The figure 17 represents a 3D view of the support rod of the second motor.
• The figure 18 represents an exploded view of the support rod of the second motor.

Numerical references of figures

• 1: Rotating blower brush
• 2: Handle with two different diameters
• 3: Heating means
• 4: First engine located in the handle
• 5: Compressor allowing a substantially constant air flow.
• 6: Second motor located outside the handle in the hollow of the support rod
• 7: Ergonomic grip area of the handle
• 8: Fixed (non-removable) engine support rod
• 9: Air evacuation openings arranged in concentric circles
• 10: Male polygonal coupling cooperating with a female element on the cylindrical brush
• 11: Locking mechanism of the slightly protruding cylindrical brush
• 12: Heating element
• 13: Switch allowing rotation in clockwise and anticlockwise direction.
• 14: lonizer
• 15: External protection grille
• 16: Straightening fins
• 17: Cylindrical brush with tufts of hair and openings positioned in circles
• 18: Foam Filter Holder
• 19: Hinge to allow the opening and the maintenance of the grid of protection
• 20: Off-center power supply
• 21: Notch for passage over the protective grid for the power supply
• 22: Fins fixing the motor support rod to the handle
• 23: Aerodynamic tip associated with the fixing fins
• 24: Internal protection grille.
• 25: Toggle system for rotation switch clockwise and counterclockwise
• 26: Rotary electrical contact
• 27: Axis of the second motor
• 28: Outer assembly ring of both hulls
• 29: Half-hulls of the handle
• 30: Filter
• 31: gearbox
• 32: Closure cap of the support rod

Detailed description of the invention

The present invention discloses an electric rotary blower brush having a particularly ergonomic elongated handle in which are arranged a heating means and a compressor driven by a first motor for sucking air at one end of the apparatus and the blow through heating elements to a rotating accessory. The rotating accessory is preferably a removable cylindrical brush with tufts of bristles, arranged on a support rod at the opposite end of the handle and driven by a second motor arranged outside the handle on a support rod located in the longitudinal axis of the handle. This configuration makes hair shaping faster and more homogeneous than the apparatus of the state of the art ( Fig.3 ).

The location of air passage between the handle and the support rod of the second engine has been the subject of a thorough aerodynamic study. Compared to the prior art configurations, the aerodynamic tip-shaped shape associated with rocket-like fin fins allows optimized airflow through the apparatus. It also simplifies the construction of the apparatus at the molded plastic parts and allows a solid and simplified attachment of said support rod to the handle. The handle is formed of two half-shells which are assembled and tightened around the fixing fins of the support rod of the second motor by an assembly ring. This construction makes it possible to simplify the construction of the apparatus while ensuring the rigidity of the fastening of the support rod of the second motor ( Fig.12 ).

To improve the ergonomics of the rotary blower brush according to the present invention, it comprises a handle with two diameters D1 and D2 substantially different. Such a blower brush, provided with a cylindrical brush with tufts of bristles, and air outlets, not arranged uniformly on the cylindrical brush, but judiciously arranged allows shaping the hair by winding a entire or partial wick around the brush. The removable cylindrical brush has tufts of bristles and air outlet openings distributed by section or by decreasing number towards the end of the apparatus on its cylindrical surface (see FIG. figures 8 , 10 and 11 ). This arrangement in section and / or in number of decreasing air openings towards the end of the accessory associated with an ergonomic handle comprising a compressor capable of maintaining an air flow substantially constant, even when the air outlet openings on the brush are partially obstructed, allows a homogeneous distribution of airflow around the brush (see Figures 1 and 2 ).

In order to optimize the air flow, the air intake, through the outer protection grille, must be centered on the longitudinal axis of the appliance, which results in an off-center positioning of the supply. electric. The off-center positioning of the power supply causes the need for a rotating electrical contact at the point of connection with the cable to improve the ergonomics of the device during different grips by the user (see figures 9 and 13 ).

By the choice of a powerful compressor that maintains a substantially constant air flow and its positioning in a portion of the enlarged diameter handle D1 and guiding the flow of air straightened by fins, to avoid turbulence, through a thinned handle of diameter D1 and a studied configuration of the heating resistances (see Figures 15 and 16 ) it is possible to improve the ergonomics of the gripping zone while generating a flow of air quite uniform through openings on the cylindrical brush via the decrease in the number and / or the section of the openings in s' away from the handle. This can be achieved in different ways by making either smaller and smaller apertures along the longitudinal axis of the cylindrical brush or by decreasing the number.

The apparatus according to the present invention also comprises a mechanism for recognizing the accessory used, for example cylindrical brushes of different diameter. This recognition mechanism allows control of the air flow, the heating power and the speed of rotation of the rotary brush.

According to a preferred embodiment of the invention, the air outlet openings on the cylindrical brush are arranged at least partly in concentric circles whose diameter becomes smaller and smaller away from the handle (see Figures 10 and 11 ).

The motor support rod protruding from the handle, having in its hollow part the drive motor of the brush and a gearbox comprises a male polygonal coupling element at the end which cooperates with a corresponding female recess on the brush allowing quick assembly and disassembly of the accessory. The support rod, once assembled, is closed by a cap that closes the assembly (see figure 18 ).

In a preferred embodiment of the invention the coupling element is square and is directly fixed on the axis of the gear box of the second motor without no intermediate part. The motors used are preferably brushless motors, but one can also consider an ordinary engine. In both cases a force torque limitation or mechanical disengagement can be envisaged if a given torque is exceeded in order not to force the motor during improper use.

At one end of the handle, on the compressor side, is the air intake which passes through an external grill, a filter and an internal grill. The filter, generally made of plastic foam, is held by a support, here in the form of a cross (see figure 13 ). To allow cleaning of these elements, the external suction grille is hinged.

The cylindrical brush with its air evacuation openings is generally made of metal, preferably aluminum and preferably has a ceramic layer for a more uniform distribution of heat. The cylindrical brush also has a locking mechanism slightly protruding relative to the surface closing the cylinder (see Figures 10 and 11 )

The apparatus also includes an ionizer located in the handle in the extension of the first motor so as not to disturb the flow of air. It is also equipped with a double protection grille at the level of the air intake.

Like all rotating blower brushes, it also includes a main switch regulating the flow and temperature of the air leaving the handle and a secondary switch to choose the clockwise or anticlockwise rotation of the cylindrical brush. This switch is mounted on a spring rocker system allowing it to automatically regain its equilibrium position after being actuated (see figure 14 ).

The winding of the heating resistor wires may have a star coil configuration (see FIG. Figures 15 and 16 ).

It has been found that temperature control is facilitated by positioning a temperature probe at the end of the support rod rather than in the handle because of the proximity of the heat radiating heaters.
To comply with the regulations on electrical safety, the cylindrical brush may be fixed (non-removable) or removal related to a mechanism cutting the electrical contact during the removal of the cylindrical brush.

Claims (17)

Rotary blower (1) of length L comprising a handle (2), a heating means (3), a first motor (4) for driving a compressor (5) and a second motor (6) for driving a brush (5) rotating, the first motor (4), the heating means (3) and the compressor (5) being positioned in the handle (2) and the second motor (6) for driving the rotating brush being positioned outside the handle (2) inside a support rod (8), characterized in that the handle (2) has two distinct zones of diameters D1 and D2 substantially different, the first diameter D1 being substantially greater than the second diameter D2, the diameter zone D1 housing the compressor (5) and the diameter zone D2 representing the gripping zone (7) of the rotary blower brush (1). Rotary blower brush (1) according to claim 1, wherein the diameter D2 is 10% smaller than the diameter D1, preferably 15% smaller than the diameter D1 and particularly preferably 20% smaller than the diameter D1. Rotary blower brush (1) according to any one of the preceding claims, wherein the diameter D2 of the gripping zone (7) represents less than 15% of the total length L, preferably less than 12% and particularly preferably less than 9%. Rotary blower brush (1) according to any one of the preceding claims, wherein the compressor (5) maintains a substantially constant flow rate between 300 and 1000 l / min, preferably between 350 and 850 l / min and particularly preferably between 400 and 600 l / min. Rotary blower brush (1) according to any one of the preceding claims, wherein the ratio between the power of the heating means Watt and the air flow in l / min is between 1 and 2.5, preferably between 1.5 and 2.5 and particularly preferably between 1.5 and 2. Rotary blower brush (1) according to any one of the preceding claims, in which the transition zone between the diameter D1 and the diameter D2 on the handle (2) comprises fins (16) for rectifying the flow of air coming from the compressor (5). A rotary blower brush (1) according to any one of the preceding claims, wherein the two motors (4,6) are brushless motors. A rotary blower brush (1) according to any one of the preceding claims, wherein D1 is between 45 and 60 mm, preferably between 48 and 55 mm and particularly preferably between 50 and 54 mm. Rotary blower brush (1) according to any one of the preceding claims, wherein the diameter D2 is between 35 and 45 mm, preferably between 37 and 43 mm and particularly preferably between 39 and 41 mm. Rotary blower brush (1) according to any one of the preceding claims, wherein L is between 300 and 400 mm, preferably between 320 and 380 mm and particularly preferably between 330 and 360 mm. Rotary blower brush (1) according to any one of the preceding claims, wherein the handle comprises a temperature sensor at its output controlled by the heating power to prevent overheating of the device. Rotary blower brush (1) according to any one of the preceding claims, wherein the cylindrical brush has air outlet openings arranged at least partly in concentric circles (9), the diameter of these circles decreasing progressing towards the end moving away from the handle (2) Rotary blower brush (1) according to any one of the preceding claims, wherein the handle (2) comprises an ion generator (14) located in the extension of the motor (4) of the compressor (5). Rotary blower brush (1) according to any one of the preceding claims, wherein the support rod (8) of the motor (6) comprises a polygonal coupling element (10) cooperating with the cylindrical brush (17) of the rotary brush . A rotary blower brush (1) according to any one of the preceding claims, wherein the cylindrical brush (17) of the rotating brush is made of a metal coated with a ceramic layer. Rotary blower brush (1) according to any one of the preceding claims, wherein a temperature sensor is placed on the support rod to allow to adapt the air flow and the heating power of the device. A rotary blower brush (1) as claimed in any one of the preceding claims, wherein said brush comprises a cylindrical brush type sensing system for adjusting the air flow, the heating power of the apparatus and the speed motor rotation.

Images