FR2782904A1 - HOT AIR AND COLD AIR HAIRDRYER SIMULTANEOUS - Google Patents

Abstract

The hair dryer contains first and second adjacent air ways (17,19) which simultaneously deliver a parallel hot and cold air flow in the same direction (XX') and sense (18,20). The airways have a common wall which is parallel to the large side of the air flow. The hot air way (17) delivers an air through a channel shorter than that of the cold air flow channel (19). Preferred Features: The difference in length between the two channels is 1 cm.

Description

i

  HOT AIR HAIR DRYER AND SIMULTANEOUS COLD AIR.

  Electric hairdryers delivering a hot air flow are essential accessories in hairdressing salons: they allow not only the professional to simply dry the wet hair after a shampoo, but also, the stylist, to get in shape hairstyle and create curls and ripples. For this last operation, relatively hot air is absolutely necessary: the hair can only be set after a certain temperature. It must be kept in shape until it is

  cool, delaying the completion of the hairstyle.

  If a cold air flow was available, it would be

  possible to quickly cool the locks and thus save time.

  Conventional hair dryers can deliver cold air by cutting off the power supply of the heating resistor, but because of the thermal inertia of the assembly, the hot air switch /

cold air is not instant.

  This disadvantage of conventional hair dryers, delivering only hot air through a nozzle, had been recognized by Robert Bartolac, who proposed a modification thereof, disclosed in the patent

  US-A-4297564 published October 27, 1981.

  The modification consists in adding to the rear of the apparatus a second nozzle delivering cold air in the same direction, but in an opposite direction. Cold air is drawn directly from the internal fan. A rotary cover makes it possible to put into service or to close this second nozzle. When said second nozzle is active, a simple movement of the hand is sufficient to apply either hot air or cold air

  turning over the hair dryer held by the handle.

  If the problem of rapid cooling of locks of hair is thus elegantly solved, the disadvantage of the effects of a heat

  intense on the hairline, as well as on the person who is wearing the hair

same, remains.

  This other disadvantage of standard hairdryers, whose electric power continues to increase, and, concomitantly, the risk of damage and burn in their use, had been clearly identified by Andrew Hlavac. The new type of hairdryer described in US-A-3943329, published in the name of this inventor March 9, 1976, includes a safety nozzle for removing these hazards. This nozzle, pyramidal or frusto-conical, extends the hot air outlet. Its larger size reserves a space through which cold air is sucked by venturi effect. The temperature of the projected air flow is thus lower and the hair of the person wearing the hat is not likely to come into contact with an element

very hot from the camera.

  However, if job security is improved

  thanks to the implementation of this type of nozzle, the effectiveness of this new dryer

hair is probably lesser.

  Swiss patent CH-A-669319 of Spemot, published March 15, 1989, discloses another type of hair dryer simultaneously delivering hot air and cold air. A fraction of the air produced by the fan is, before the air is heated, deflected by the resistor to a secondary outlet by means of a valve controlled by a trigger. This arrangement makes it even simpler to perform the hairdresser's actions necessary to achieve the results obtained using the apparatus described by

US-A-4297564.

  However, the direction of the cold airflow projected by

  the secondary outlet is different from that of the main hot air stream.

  Some common operations, such as "brushing" or scaling hair, can not benefit from

this provision.

  It therefore follows from the state of the art as described in the documents cited above that hairdryers delivering both hot air and cold air simultaneously are known, but that there is no such thing as day no hair dryer of this type having characteristics such that it is advantageously used for all the work of the hair salon, while

  guaranteeing the complete absence of inconvenience for the person wearing the hat.

  GENERAL DESCRIPTION OF THE INVENTION

  The present invention relates to a hair dryer

hot air and simultaneous cold air.

  Conventionally, this hair dryer has a housing of the general shape of a surface of revolution about a longitudinal axis, having a front portion and a rear portion. A motor

  electric is mounted inside the rear part and drives a fan.

  This fan produces a flow of air back and forth, sucked by an air inlet through the wall of the housing. A first channel channels a first part of the air flow, while a second channel channels the second

part of the flow.

  Conventionally, an electrical resistance heats the first part of the airflow. A handle, integral with the housing, is provided with buttons for controlling the speed of the motor and adjusting the electrical power consumed by the resistor from an external source of electrical energy. A first nozzle planned in the extension of the

  first duct delivers hot air.

  In addition, a second nozzle provided in the

  extension of the second duct delivers cold air.

  The subject of the invention is precisely a dryer

  hair of this type whose essential characteristic is that the first and second nozzles simultaneously deliver, respectively, hot air and

  cold air in the same direction and in the same direction.

  An additional feature of the hair dryer according to the invention is that the first and second nozzles are adjacent, their

  common wall being located substantially in a radial plane of the housing.

  It is remarkable that the first nozzle is shorter than the second and the plane of the outlet orifice thereof is inclined

  relative to a plane perpendicular to the common direction of the air flows.

  According to the invention, the first and second nozzles are advantageously constituted by a single double-duct and double orifice nozzle. This single nozzle is fitted on the front part of the casing, while being held fixed in translation longitudinally and free in rotation

around this part.

  The double duct has an inlet, corresponding to the shortest outlet duct, of circular section. The first conduit is a tube whose front portion also has a circular section. The front part of this tube is engaged in this input while remaining free in rotation. The rear part of the tube is, for its part, held substantially in the center of the base of the front part of the housing by the

  minus three longitudinal ribs.

  Very advantageously, the cross section of each of the outlet orifices of the single nozzle is rectangular, preferentially

  about ten times longer than wide.

  Another characteristic of the hair dryer according to the invention is that the single nozzle is held fixed in translation longitudinally by means of at least two clips cooperating with a groove.

  annular cut in the front part of the case.

  The simultaneous hot air and cold air hair dryer according to the invention is, very advantageously, used by the drying process of projecting on the object or the material to be dried a laminar air flow having a gradient. transverse temperature, the coldest part of the flow being kept closest to the surface of the object or material by rotating the single nozzle of the device.

BRIEF DESCRIPTION OF THE DRAWINGS

  Figure 1 shows, on the right, the general structure of the simultaneous hot air and cold air hair dryer in accordance with

the invention.

  Figure 2 is a section through a medial plane A-A showing the internal structure of the hot air and cold air hair dryer

  simultaneous according to the invention.

  Figures 3a and 3b are respectively a front view and a rear view of the single orifice double nozzle according to an advantageous characteristic of the hot air and cold air hair dryer

  simultaneous according to the invention.

  DESCRIPTION OF A PREFERRED EXECUTION FORM OF

THE INVENTION

  References to Figures 1, 2, 3a and 3b will be used to

  explain the different features of the invention.

  The general shape of the housing (1) of the hair dryer is that of a surface of revolution about a longitudinal axis (XX '). The front portion (2) of this housing has the general shape of a truncated cone of small aperture, a mean diameter greater than the current size of a device of the same category. This front portion (2) is attached to a rear portion (3) whose general, traditional, is that of a cylinder which would bulge in its middle part, or a small barrel. In the example

  of the invention, this part is, still in a traditional way, itself

  even consisting of two half-shells fitting into one another.

  An electric motor (4) is mounted inside the rear part (3) of the housing (1). It is a 220-240 V alternating current motor with a power of one hundred watts. This motor (4) drives a centrifugal fan (5) (both shown in dashed lines in Figure 1), which produces a flow of air (6) from back to front at

the inside of the case (1).

  The air is sucked by an air inlet (7) formed through the rear wall of the housing (1). This air inlet, equipped with a grill,

  is also an insert on the rear part (3).

  A first duct (8) having the general shape of a truncated cone of opening substantially equal to that forming the front portion (2),

  channels a first portion (9) of the air flow (6) produced by the fan (5).

  The space left free by this first tubular duct (8), in the front part (2) of the hair dryer, constitutes a second duct (10) channeling the second

part (11) of the air flow (6).

  As can be seen in FIG. 2, an electrical resistance (12), wound on braces, is inside the first duct (8). With an electric power between 1500 W and 1700 W, it

  heats the portion (9) of the air flow flowing in the first duct (8).

  A handle (13) contiguous to the rear part (3) of the hairdryer allows easy use thereof. This handle is in the form of two half-shells joined by screws. In the traditional way, these two half-shells are in fact advantageously the extensions of the two half-shells constituting the rear part (3) of

the device.

  The handle (13) carries two control buttons (14, 15). One (14) sets the speed of the electric motor (4): as needed, the fan (5) can be stopped or maintained at medium or maximum speed. The other button (15) makes it possible to switch the electrical power consumed by the heating resistor (12) between a zero, average value

and maximum.

  The handle (13) is provided with a wire pass intended for

  hold the AC power cord (16).

  A first nozzle (17) is in the extension of the first conduit (8) containing the heating resistor (12), and accordingly delivers hot air (18). A second nozzle (19) collects the flow of cold air (11) flowing between the inner wall of the front part (2) of the apparatus and the duct (8) channeling the hot air, to eject it in the even

  direction (XX ') and in the same direction (20) as the hot air (18).

  Preferably, the section of the first duct (8) is substantially equal to or even slightly greater than that of the second duct (10) so that the hot air flow rate produced by the apparatus according to the invention is equal to or,

  according to, slightly higher than the flow of cold air.

  As shown in Figures 3a and 3b, the nozzles (17, 19) have a complex shape. The assembly is like two flat tips, conventional, which would have been nested laterally in one another, a lower side portion of the nozzle for blowing cold air has been removed. A side portion of the nozzle blowing hot air then constitutes the common wall (21) of the two nozzles (17, 19). The two nozzles are arranged in such a way that this common wall (21) corresponds to a plane

radial (BB) of the housing (1).

  As indicated by the section along the median plane (AA) shown in FIG. 2, the first nozzle (17) delivering hot air is shorter than the second nozzle (19) delivering cold air, the difference in length (E) is substantially 1 cm in this preferred embodiment. In addition, the plane (CC) of the outlet orifice (22) of the second nozzle (19) has an angle of inclination (4) relative to a plane perpendicular to the longitudinal axis thereof. This angle of inclination (o) is

  of the order of 35 for this particular embodiment of the nozzle (19).

  The difference in length (E) between the two nozzles (17, 19) and the bevel size of the cold air nozzle depends on the use that will be made of the hair dryer, as will be explained later . However, the angle

  tilting angle (o <) is preferably between 30 and 45.

  The front and rear views of the nozzles (17, 19), shown in FIGS. 3a and 3b, show that they form in fact an integral piece constituting a single duct (23) with a double duct (24). , 25) and

double orifice (22, 26).

  As with conventional flat ends, the cross-section of each of the outlet ports (22, 26) of the single nozzle (23) is

  rectangular, and about ten times longer than wide.

  This single nozzle (23) can be inserted manually on the front part (2) of the hair dryer. It is held fixed longitudinally, while being free in rotation. By exerting sufficient effort, however, it can be removed manually to be replaced by

case of need.

  The inlet (27) of the double conduit (24, 25)

  corresponding to the shortest outlet duct (25) is of circular section.

  The front end (28) of the conical duct (8) containing the resistor (12) is also of circular section, of a diameter slightly smaller than that of the inlet (27), and is engaged in this inlet (27). ) while remaining free

  rotating in both directions, retrograde and direct.

  The section (AA) of FIG. 2 shows that the rear part (29) of the tubular duct (8) is kept substantially in the center of the

  base (2 ') of the front part (2) of the housing (1) by longitudinal ribs (30).

  These ribs have the appropriate width at the rear and they taper forward, until disappearing: the front portion (28) of the tubular duct (8) can thus freely debate within the entire section of the front part (2) of the

housing (1).

  This particular arrangement allows the orifices (22, 26) to be oriented, as required, by rotating the single nozzle (23) around the front portion (2) of the hair dryer, while continuing to be powered by cold air and hot air, respectively. During this rotation of the nozzle (23), regardless of the direction of said rotation, the front portion (28) of the conduit (8) remains engaged in the circular inlet (27) of the nozzle, so that that the conduit (25) opening on the outside through the orifice (26) still blows

  hot air, and only hot air.

  According to the particular embodiment described, the single nozzle (23) is held longitudinally by means of at least two clips (31) cooperating with an annular groove (32) cut in the front part (2), close to the end of it. This process is well known in the field of manufacturing molded plastic articles. He was retained

  here because it contributes to the ease of use of the device.

  The hair dryer according to the invention has many advantages, in particular because of the differences in length (E) of the

nozzles (17, 19).

  It allows the operator to check immediately

  what is the outlet (26) of hot air (18) and what is the outlet (22) of cold air (20).

  It offers especially to the professional the possibility of implementing a new hair drying process, consisting in projecting on the root of the hair a laminar air flow having a transverse temperature gradient, the coldest part of the flow being

  advantageously kept closest to the scalp.

  To do this, the longest nozzle (19), which blows cold air (20), is placed near or even against the head, the shortest nozzle (17), which delivers hot air (18), being the furthest away from the head. Depending on whether one is covering the left or right part, or the top of the head, or the neck, the tip (23) is oriented by rotating it around the front part

  (2) of the housing (1), in order to respect this arrangement of the nozzles (17, 19).

  With this method, the hair, first shaped and dried by hot air, is immediately cooled after the passage

hot air.

  Such a treatment of the hair with a hot air / cold air mixture leads to a better inflated hair, as well as a

  better hold of the "blow-dry" and the volume of the hairstyle.

  Finally, the use of cold air makes it possible to avoid

  effects of heat on the person who is combed.

  It goes without saying that the invention is not limited to the above-mentioned technical specifications given by way of example; she

  embraces, on the contrary, all possible variants of achievements.

Claims (8)

  1) Hair dryer with simultaneous hot air and cold air, comprising a housing (1) of the general shape of a surface of revolution about a longitudinal axis (XX ') having a front part (2) and a part rear (3), an electric motor (4) mounted within said rear portion (3) and driving a fan (5) producing a flow of air (6) back and forth sucked by an inlet of air (7) formed through the wall of said housing (1), a first duct (8) channeling a first portion (9) of said air flow (6), a second duct (10) channeling the second portion (11). ) of said air flow (6), an electrical resistance (12) heating said first portion (9) of the air flow (6), a handle (13) provided with speed control knobs (14, 15) (14) said motor (4) and adjusting the electrical power (15) consumed by said resistor (12) from an external electrical power source (16), a first nozzle (17) located in the extension of the first conduit (8) delivering hot air (18), and a second nozzle (19) located in the extension of the second conduit (10) delivering cold air (20), characterized in that said first and second nozzles (17, 19) simultaneously deliver, respectively, hot air and cold air in the same direction (XX ') and in the same direction (18, 20).   2) simultaneous hot air and cold air hair dryer according to claim 1, characterized in that said first and second nozzles (17, 19) are adjacent, their common wall (21) being located   substantially in a radial plane (BB) of the housing (1).   3) Hot air and cold air hair dryer   simultaneous devices according to any one of claims 1 or 2, characterized in that   that the first nozzle (17) is shorter than the second nozzle (19), the difference   of length (E) preferably being 1 cm.   4) Hot air and cold air hair dryer   simultaneous devices according to any of claims 1 to 3, characterized in that   that the plane (CC) of the outlet orifice (22) of the second nozzle (19) has an angle of inclination (o) with respect to a plane perpendicular to said direction (XX '), said angle of inclination (oc) being preferably between 30 and 45.   ) Hot air and cold air hair dryer   simultaneous devices according to any one of claims 1 to 4, characterized in that   said first and second nozzles (17, 19) are constituted by a single double-ducted (24, 25) and double-orifice nozzle (22, 26) fitted on the front part (2) of the casing (1) while being held fixed in translation   longitudinally and free to rotate around said front portion (2).   6) simultaneous hot air and cold air hair dryer according to claim 5, characterized in that said double duct (24, 25) has an inlet (27), corresponding to the shortest outlet duct (25), which is of circular section and in that the front portion (28) of the first duct (8) has a circular section, said front portion (28) of the   conduit (8) being engaged in the inlet (27) while remaining free in rotation.   7) Hair dryer with simultaneous hot air and cold air according to claim 6, characterized in that the rear portion (29) of the duct (8) is maintained substantially in the center of the base (2 ') of the part   front (2) of the housing (1) by at least three longitudinal ribs (30).   8) Hot air and cold air hair dryer   simultaneous devices according to any one of claims 5 to 7, characterized in that   that the cross section of each of the outlet orifices (22, 26) of the single nozzle (23) is rectangular, and preferably about ten times longer than wide. 9) Hot air and cold air hair dryer   simultaneous devices according to any one of claims 5 to 8, characterized in that   that the single nozzle (23) is held fixed in translation longitudinally by means of at least two clips (31) cooperating with an annular groove (32)   cut in the front part (2) of the housing (1).   ) Hot air and cold air hair dryer   simultaneous devices according to any one of claims 1 to 9, characterized in that   that the section of the first duct (8) is substantially equal or slightly   greater than that of the second duct (10).   11) Drying process, using the hair dryer to   simultaneous hot air and cold air according to one of claims 1 to   10 above, characterized in that it is projected on the object or the material to be dried a laminar air flow having a transverse temperature gradient, the coldest part of the flow being kept closest to the surface of said object or said material to be dried by rotating maneuver a single nozzle (23).