FR2792256A1 - Ventilator and air circulator for passenger compartment of road vehicle has housing with swivel nozzle and valve and spherical enlarged portion at end of tube controlling setting of valve - Google Patents

Abstract

The ventilator includes a narrow tube (4) with an enlarged spherical end (25) which fits inside a swivelable nozzle (6). The nozzle has an outer ring with a spherical outer surface to fit into a cylindrical casing which slides over a tube (2a) which contains the air valve. The valve has a movable disc, with segmental openings (35), in contact with a fixed disc (13) with segmental openings (15). A rotary knob (45) on the front of the casing (2b) has a stem which has a polygonal head (47) which can fit inside spherical head on narrow tube and can turn it.

Description

i The present invention relates to an aerator, in particular for

passenger compartment of a motor vehicle.

  A ventilator for the passenger compartment of a motor vehicle conventionally comprises: - a housing delimiting a duct for the flow of air, with an air inlet in the case, connected to an air intake duct, and an outlet d 'air; -means for the orientation of the air flow, located at the air outlet of the housing, and - means for opening and closing the duct

  of air flow, to control this flow.

  The flow orientation means frequently consist of a grid pivotally mounted in the housing, which includes a series of fixed fins, and by pivoting fins located behind this grid, which are perpendicular to the fins of the grid. These pivoting fins are coupled to the same connecting rod and can be ordered in

  pivoting by a button projecting from the front face of the grid.

  The pivoting of the latter, combined with that of said fins, makes it possible to orient the air flow in the direction desired by the

vehicle passengers.

  In certain aerators, these flow orientation means are

constituted by a pivoting nozzle.

  The means for opening and closing the air flow duct are, in turn, constituted by a pivoting flap located in the housing. This shutter is controlled by means of an appropriate transmission, placed laterally with respect to the shoemaker, and a wheel or

  a cursor located near the grid.

  The existing aerators have the disadvantage of being complex to manufacture and to assemble taking into account the number of different parts which they comprise, in particular as regards the manufacture and the setting

  in place of the aforementioned pivoting fins.

  In addition, existing aerators must include a rectilinear light for the sliding of the button which controls the pivoting of these fins, which significantly limits the visual aspects that it is possible

  to give to the air diffusion organ.

  The present invention aims to remedy these fundamental drawbacks by providing an aerator comprising a reduced number of parts, retaining all the functions of conventional aerators and not exhibiting the aforementioned constraint in terms of visual appearance of the diffusion member. air. The aerator concerned comprises, in a manner known per se - an open box at two opposite ends, for delimiting an inlet and an outlet for the air as well as a duct for the flow of this air; - an air diffusion nozzle, pivotally mounted in the housing to allow the air flow to be oriented in several directions, and - means allowing the opening or closing of the duct

air flow.

  According to the invention - the housing comprises a tube, immobilized axially relative to it, comprising a bulge of spherical shape on the side of the end of this tube situated towards the air outlet; - The nozzle comprises a seat of spherical shape suitable for coming into engagement with said bulge, this engagement allowing the mounting of the nozzle in the housing and the pivoting of the latter relative to the latter; - The nozzle comprises an actuating member connected to said tube or to a transmission member supported by this tube, being locked in rotation relative to this tube or to this member, the connection between this operating member and this tube or this member transmission being produced by a concentric articulation to the spheres generating the spherical walls of said bulge and of said seat; - said transmission tube or member is itself connected to said means allowing the opening or closing of the flow duct of

The air.

  The tube thus allows the mounting of the nozzle in the housing and, thanks to the spherical bulge which it comprises, allows the guidance in

  pivoting of this nozzle, for the orientation of the air flow.

  The articulation by which the operating member is connected to said tube or to said transmission member allows this operating member to

"follow" the pivoting of the nozzle.

  The tube, or the transmission member that this tube supports, can be actuated by means of the operating member to make the opening.

  or closing the air flow duct.

  The aerator according to the invention thus comprises a reduced number of parts, namely the housing, the nozzle, the operating member and a tube or transmission member / means assembly allowing the opening or closing of the flow conduit. air. It therefore makes it possible to eliminate the grid and pivoting fins and transmission systems.

  side controlled by wheel or slider.

  The operating member is pivotally movable and is located on the nozzle, which eliminates the need for a rectilinear light for the sliding of a button. Wide possibilities of visual aspects for

  this nozzle are thus made possible.

  The number of parts that the aerator includes can be further reduced, and the assembly of these parts can be facilitated, by providing the following arrangements: the bulge may have come from molding with the tube or with the transmission member supported by this tube; the tube can be pivoted in the housing and be directly connected to said means allowing the opening or closing of the air flow duct, in which case the tube and these means can have come from molding; the tube can also be fixed in the housing and support said transmission member, itself connected to said means allowing the opening or

  closing the air flow duct; Nozzle assembly

  bulge and / or assembly of the actuating member - tube or

  operation - transmission member may be of the snap type.

  Preferably, the bulge is formed by a plurality of independent lobes, distributed over a circle and in the form of sphere sectors, the outer walls of these lobes being rounded and defining the aforementioned spherical shape of this bulge; these lobes define between them a polygonal cavity and are movable, from the neutral position which they naturally occupy, to a radially inner position; The actuator has a tip comprising a median part of cross section corresponding to the cross section of said polygonal cavity, and axial ends of rounded shape, this median part allowing the aforementioned setting in rotation of this actuator relative to said tube or said transmission member, and these axial ends allowing the articulation of this same operating member with respect to this tube or this transmission member; - Said seat of the nozzle extends over a range greater than a hemisphere, and the opening of this seat allowing the engagement of the nozzle on said bulge has a diameter corresponding to the diameter defined by said lobes in their radially inner position; this same seat also has a diameter corresponding to the diameter that

  define the lobes in their neutral position.

  The assembly is thus shaped so that, in the neutral position of the lobes, the tip of the operating member can be introduced into said polygonal cavity, then the nozzle can be engaged on the lobes, thanks to the displacement of the latter in their radially inner position, until these lobes click into place inside said seat, by elastic return of these lobes in their neutral position. The assembly of this aerator is carried out simply by placing the operating member on the nozzle and then by inserting the end piece of this member into said polygonal cavity simultaneously with

  The snap-fitting of the nozzle on said bulge.

  This assembly is therefore particularly simple and

quick to do.

  Advantageously, the walls of the lobes delimiting the polygonal cavity are inclined in the direction of the axis of this cavity, so that they delimit, in said neutral position of these lobes, a cavity inlet having a cross section smaller than the section transverse of the middle part of said tip, and the lobes, before snap-fitting of the nozzle, are movable, beyond said neutral position, towards a position

radially exterior.

  The assembly is thus shaped so that the tip can be snapped between the lobes, thanks to said outward mobility of the latter. The actuator is therefore retained by its tip in said cavity, once the nozzle has been snapped onto said bulge, and that, consequently, the lobes are placed in their neutral position, in which the opening of the polygonal cavity has a cross section smaller than that of the middle part of the tip of this member. It is therefore not necessary to provide a particular assembly of this member of

nozzle operation.

  The assembly of the aerator according to the invention is further simplified. According to one embodiment of the invention, said means allowing the opening or closing of the air flow duct comprise: - a transverse wall integral with the housing, provided with openings for the flow of air and comprising a pin protruding longitudinally into the housing; - A disc integral with the tube, having openings, the tube being shaped to be able to be engaged and to be able to pivot on said pin, and the disc coming close to said transverse wall in this position of engagement, said openings of this disc being suitable, in an angular position of the disc, to cover the openings of this transverse wall so as to prevent the flow of air, and, in another angular position, to release these same openings to allow

this flow.

  The aerator thus formed may comprise only four parts, namely the nozzle, the operating member, the tube-disc assembly and

  the housing-transverse wall assembly.

  The housing and the disc may include stops delimiting the two aforementioned angular positions of the disc, which can be advantageously arranged by molding. The stops of the housing can advantageously be shaped to allow the latching of the

disc beyond them.

  According to another embodiment of the invention, said means allowing the opening or closing of the air flow duct comprise: - a socket constituting the aforementioned transmission member, engaged in the tube and able to pivot by relative to this, this socket comprising two helical lights; - A finger housed and able to slide inside this socket, this finger comprising two diametrically opposite lugs, themselves engaged and able to slide in the two helical slots of the socket; this finger comprises at least one rectilinear gripping surface, parallel to the sliding axis of this finger in the socket; - The housing comprises at least one clean pivoting flap, in a pivoting position, for closing the air flow duct, and, in another pivoting position, for allowing this flow, this flap comprising a grip surface circular, suitable for engagement

  with said finger grip surface.

  The pivoting of the operating member allows the bushing to pivot between two angular positions, to move the finger between two axial positions, namely a position in which this finger allows the flap to be placed in one of said pivoting positions of this flap and another axial position in which this finger allows the flap to be placed

  in the other of the aforementioned pivoting positions.

  The aerator thus shaped may comprise only six parts, namely the operating member, the nozzle, the housing-tube assembly, the sleeve, the

finger and flap.

  Advantageously, the aforementioned finger comprises two gripping surfaces and the housing comprises two flaps pivoting in opposite directions, these two flaps being simultaneously actuated by the sliding of said

finger.

  For a good understanding, the invention is again described below with reference to the appended schematic drawing representing, by way of nonlimiting examples, three preferred embodiments of the aerator

it concerns.

  Figure 1 is an exploded perspective view, partly in section, of this aerator according to a first embodiment; Figure 2 is a perspective view from a slightly different angle, after assembly; Figure 3 is an exploded perspective view, on an enlarged scale, of two parts that it comprises; Figure 4 is a view of these two parts in section, after assembly; Figures 5 and 6 are side views of this aerator, in axial section, in two different positions; Figure 7 is a perspective view of an assembly that includes this aerator, according to a second embodiment; Figure 8 is a perspective view of another assembly that includes this aerator; Figure 9 is a side view of this aerator, in axial section; Figure 10 is a view of this aerator similar to Figure 9, according to an alternative embodiment; FIG. 11 is an exploded perspective view, with partial section, of this aerator according to a third embodiment, and

  Figure 12 is an exploded view, in longitudinal section.

  The parts or parts which are found in these different embodiments or in this variant, or which are similar from one embodiment to another, are designated by the same reference numerals. Figures 1 and 2 show an aerator 1 for the passenger compartment of a motor vehicle, comprising a housing 2 in two parts 2a, 2b, a part 3 comprising a tube 4 and a disc 5, a pivoting nozzle 6 for orientation and diffusion of the air in the passenger compartment, and a button-type member 7. All of these parts are molded from a synthetic material

  having a degree of flexibility such that it allows a snap-fastening.

  The part 2a of the housing 2 delimits an air inlet opening 10 intended to be connected to an air supply duct (not shown), an air outlet opening 1, and a flow duct 12 of this air

through the housing 2.

  This part 2a comprises a transverse wall 13, and a pin

  axial 14 projecting towards the opening 1 1 of air outlet.

  Four openings 15 in the form of sectors of a circle are

  arranged through the wall 13, to allow the flow of air.

  As shown in FIG. 1, each opening 15 extends over an angle of at most 1 / 8th of the circumference of the part 2a, and is separated from the neighboring openings 15 by a solid portion of this wall 13 extending

  on at least 1 / 8th of said circumference.

  The pin 14 is in turn intended to receive the tube 4 and has a cross section to minimize friction with this tube 4. In addition, the part 2a comprises two bosses 16, shown in Figures 5 and 6, projecting from its internal face, near the wall 13, shaped so as to allow a latching of the disc 5 beyond them, while allowing the mobility of this disc 5 in pivoting after this latching. These bosses 16 are shaped so as to cooperate with lugs 36 which the disc 5 comprises to define two positions

  maximum angular pivoting of this disc 5.

  Part 2a also includes two ribs 17 projecting from the outside face of its wall, for the snap-fastening of part 2b

on her.

  In addition, the part 2a comprises a conical clearance 18 arranged in the zone of its wall which delimits said air outlet opening 11, to allow the angular movement of the nozzle 6, as appears more particularly in FIGS. 5 and 6 , and a series of ribs 19 arranged in this same area to allow the guidance of the

  pivoting of the nozzle 6 with low friction.

  Part 2b comprises two tabs 20 having windows 21, suitable for cooperating with the ribs 17 to allow this part 2b to be snapped onto part 2a after assembly of the parts 3, 6 and 7 above between these parts 2a and 2b, and an opening 22 allowing the air to exit. The wall 23 which delimits this opening 22 comprises a spherical bearing surface for guiding the nozzle 6, as shown more

  particularly Figures 5 and 6.

  It should be noted that this part 2b could be omitted, and that the legs 20 as well as the opening 22 could be arranged in the wall of the vehicle intended to receive the aerator 1, in particular a table.

of edge.

  The tube 4 has a diameter such that it can be engaged and can pivot on the pin 14, as indicated above. At its end located near the air outlet opening 11, it has a bulge 25 of partially spherical shape, constituted by six lobes 26 in sectors of a circle. As shown more particularly in Figures 3 and 4, the lobes 26 include outer walls 26a which define a spherical wall and inner walls 26b which delimit between them a cavity 27 of hexagonal shape. FIG. 4 shows that, at their upper part, these internal walls 26b are slightly inclined in the direction of the axis of the cavity 27, while at their lower part, they are parallel to the axis of this cavity 27 and delimit a portion 28 of cavity of constant cross section. It appears from these same figures that the internal upper edges 26c of the lobes 26 are bevelled. In addition, each lobe 26 is separated from the two adjacent lobes 26 by grooves 30, and the flexibility of the synthetic material constituting the part 3 allows these lobes 26 to tilt, from the neutral position which they normally occupy, towards radially inner and radially outer positions relative to this

neutral position.

  The disc 5 is molded with the tube 4. It comprises four openings 35 extending over at most 1/8 "r of its circumference and four solid zones separating two adjacent openings, these zones

  extending over at least 1/8 of said circumference.

  The above-mentioned bosses 16 and lugs 36 are arranged so that, in one of the two above-mentioned angular positions, the openings 15, 35 in the wall 13 and the disc 5 are superimposed (FIG. 6), so that the air flow through these openings 15, 35 is allowed, while in the other angular position, the solid areas of the disc 5 are located opposite the openings 15 of the wall 13 (Figure 5), and vice versa for the solid areas of the wall 13 and for the openings 35, so that the flow of air through these

openings 15, 35 is prevented.

  The disc 5 further comprises a double annular seal 37, coming to rest against the wall 13 when the disc 5 is snapped behind the bosses 16, this seal 37 can for example be

molded onto the disc 5.

  The nozzle 6 comprises a side wall 6a of a spherical envelope, suitable for sliding on the ribs 19 and on the bearing surface 23 when the parts 2a and 2b are assembled, as indicated above. It also includes a central cavity 40, delimited by a wall, the upper part of which defines a cylindrical surface 40a while the lower part

  defines a seat 40b of partially spherical shape.

  The sphere defining this seat 40b has a diameter equal to that of the sphere defining said bulge 25 in said neutral position of the lobes 26, and this seat 40b extends beyond the equator of this same sphere, the opening which delimits the lower part of this seat 40b having a diameter slightly greater than the maximum diameter of the bulge 25 in

  the radially inner position of the lobes 26.

  It follows from these provisions that the nozzle 6 can be snapped onto said bulge 25 and that it can pivot multidirectionally thereon, to allow the orientation of the air flow in the passenger compartment, as

this is deduced from Figures 5 and 6.

  In addition, the nozzle 6 comprises a series of piriform openings 41 extending radially from the axis of the cavity 40, these openings 41 giving the nozzle 6 a "flower" appearance, constituting the "petals"

of this flower.

  The button 7 comprises meanwhile a transverse rib 45 for gripping, a cylindrical surface 46 which cooperates with the surface 40a, to allow the guide of the button 7 in pivoting, and a nozzle 47. As shown more particularly in FIGS. 3 and 4, this end piece 47 has the shape of a "rounded hexagon", that is to say comprises a middle part 47a of hexagonal cross section and

  two axial ends 47b of rounded shape.

  The dimensions of the part 47a correspond to the dimensions of the portion 28 of the cavity 27, which allows the latching of the end piece in this cavity 27, by coming from this end piece 47 bearing against the edges 26c then against the internal walls 26b of the lobes 26, by pivoting of these lobes 26 towards their radially external position and by elastic return of these lobes 26 in their neutral position. The subsequent latching of the nozzle 6 on the bulge 25 makes it possible to maintain these lobes 26 in their neutral position and therefore to lock the button 7 in

said portion of cavity 28.

  It appears in particular in Figure 4 that the dimensions of the tip 47 are such that the middle part 47a of this tip 47 is located substantially at the center of the sphere which defines said

bulge 25.

  The cross section and the dimensions of this central part 47a make it possible to link the button 7 and the tube 4 in rotation, to allow the pivoting of the disc 5 and, therefore, the opening or closing of the duct 12 to be controlled, and the rounded ends il 47b allow the simultaneous pivoting of the button 7 and of the nozzle 6,

  so that this button 7 can "follow" the pivoting of the nozzle 6.

  Figures 7 to 9 show a second embodiment of the aerator 1, in which the tube 4 is integral with the part 2a, being connected to the wall thereof by radial crosspieces 50. In this case, the tube 4 supports a socket 51, this socket 51 being mounted in this tube 4, in particular by snap-fastening of an annular projection which it comprises in a corresponding groove that comprises the tube 4, and

  can rotate relative to this tube 4.

  The socket 51 has the lobes 26 on its end located on the side of the air outlet 11, and comprises two helical slots 52 offset by a half-step relative to each other. It internally receives a finger 53 with the possibility of sliding of this finger 53 in it. This finger 53 comprises two diametrically opposite lugs 54, each of which is engaged and can slide in one of the slots 52, two pins 55 which can slide in two longitudinal slots 56 arranged

  in the tube 4, and two racks 57 parallel to the axis of this finger 53.

  Each of these racks 57 meshes with a rounded rack 58 secured to a flap 60 pivotally mounted in part 2a, each of these

  flaps 60 having a substantially semi-circular shape.

  The drive of the sleeve 51 in pivoting, by means of the button 7, allows the lugs 54 to slide in the slots 52, and therefore the axial displacement of the finger 53, this displacement causing the simultaneous pivoting of the two flaps 60 between a position of pivoting, in which these flaps 60 come close to the wall of the part 2a, and thus prevent the flow of air, and a position in which these flaps 60 are at a distance from this wall, and consequently allow

air flow.

  In the variant shown in FIG. 10, the end of the finger 53 furthest from the air outlet 11 has the shape of a fork and comprises the two racks 57 on the internal sides of the branches 61

of this fork.

  Figures 11 and 12 show a third embodiment in which the nozzle 6 has a generally rectangular shape and comprises two pins 65 on two opposite edges, coaxial with one another. These two pins 65 are pivotally engaged in two holes 66 arranged in part 2a, in order to restrict the pivoting of the nozzle.

  6 to the axis defined by these two pins 65.

  This nozzle 6 has elongated openings 41, parallel to each other, delimiting fixed fins 67 oriented in one direction, and can receive by snap-fastening a piece 68 of air ducting, comprising fixed fins 69 and a button 70, the fins 69 being perpendicular to the fins 67. For the pivoting mounting of the part 68, the nozzle 6 comprises two bearings 71 opening into one of its edges by two inlets 72 while the part 68 comprises two pins 73 intended to be pivotally received in the bearings 71. After mounting, the button 70 projects through one of the openings 41 of the nozzle 6, which allows it to be actuated with a view to adjusting the angular position of

  the part 68, and therefore the orientation of the fins 69.

  The aerator according to this embodiment comprises a part 68 more than the aerator according to the other embodiments but has a more conventional presentation than the latter, which makes it suitable for another type of vehicle. In any event, the number of parts constituting these aerators remains much smaller than the number of parts of a

  aerator according to the prior art.

  It goes without saying that the invention is not limited to the embodiment described above by way of example but that it embraces, on the contrary, all the variant embodiments. Thus, the aerator nozzles according to the first and second embodiments may include openings of any possible shape, in particular holes

circulars, lights, etc ...

Claims (8)

  1 - Aerator, in particular for the passenger compartment of a motor vehicle, comprising - a housing (2) open at two opposite ends, to delimit an air inlet (10) and an outlet (11) as well as a duct (12) d flow of this air; - a nozzle (6) for air diffusion, pivotally mounted in the housing (2) to allow the air flow to be oriented in several directions, and - means (5, 13; 60) allowing the opening or closing the air flow duct; aerator (1) characterized in that - the housing (2) comprises a tube (4), immobilized axially with respect to it, comprising a bulge (25) of spherical shape on the side of the end of this tube (4) located towards the air outlet (11); - The nozzle (6) comprises a seat (40b) of spherical shape suitable for coming into engagement with said bulge (25), this engagement allowing the mounting of the nozzle (6) in the housing (2) and the pivoting of this- ci with respect to the latter; - The nozzle (6) comprises an operating member (7) connected to said tube (4) or to a transmission member (51) supported by this tube (4), while being locked in rotation relative to this tube (4) or to this member (51), the connection between this operating member (7) and this tube (4) or this transmission member (51) being produced by an articulation (27, 47) concentric with the spheres generating the spherical walls of said bulge (25) and said seat (40b); - said tube (4) or transmission member (51) is itself connected to said means (5, 60) allowing the opening or closing of the conduit (12) air flow.   2 - Aerator according to claim 1, characterized in that the bulge (25) came from molding with the tube (4) or with the member   transmission (51) supported by this tube (4).   3 - Aerator according to claim 1 or claim 2, characterized in that the tube (4) is pivotally mounted in the housing (2) and is directly connected to said means (5) allowing the opening or   closing the air flow duct (12).   4 - Aerator according to claim 1 or claim 2, characterized in that the tube (4) is fixed in the housing (2) and supports said transmission member (51), itself connected to said means (60) allowing the opening or closing of the air flow duct (12).   - Aerator according to one of claims 1 to 4, characterized in   what the assembly nozzle (6) - bulge (25) and / or the assembly operating member (7) - tube (4) or operating member (7) - member   transmission (51) are of the snap type.   6 - Aerator according to one of claims 1 to 5, characterized in   what - the bulge (25) is formed by a plurality of independent lobes (26), distributed over a circle and in the form of sphere sectors, the outer walls (26a) of these lobes (26) being rounded and defining the shape aforementioned spherical of this bulge (25); these lobes (26) define between them a polygonal cavity (27) and are movable, from the neutral position which they naturally occupy, to a radially inner position; - The actuator (7) has a tip (47) comprising a middle portion (47a) of cross section corresponding to the cross section of said polygonal cavity (27), and axial ends (47b) of rounded shape, this middle part (47a) allowing the aforementioned rotation setting of this operating member (7) relative to said tube (4) or to said transmission member (51), and these axial ends (47b) allowing the articulation of this same member operating (7) relative to this tube (4) or to this transmission member (51); - Said seat (40b) of the nozzle (6) extends over a range greater than a hemisphere, and the opening of this seat (40b) allowing the engagement of the nozzle (6) on said bulge (25) a a diameter corresponding to the diameter defined by said lobes (26) in their radially inner position; this same seat (40b) also has a diameter corresponding to the diameter defined by the lobes (26) in their neutral position.   7 - Aerator according to claim 6, characterized in that the walls (26b) of the lobes (26) delimiting the polygonal cavity (27) are inclined in the direction of the axis of this cavity (27), so that they delimit, in said neutral position of these lobes (26), a cavity inlet (27) having a cross section smaller than the cross section of the middle part (47a) of said end piece (47), and the lobes (26), before snap-on nozzle (6), are movable, beyond said   neutral position, to a radially outer position.   8 - Aerator according to one of claims 1 to 3 and 5 to 7,   characterized in that said means allowing the opening or closing of the air flow duct (12) comprise: - a transverse wall (13) integral with the housing (2), provided with openings (15) for the 'air flow and comprising a pin (14) projecting longitudinally into the housing (2); - A disc (5) integral with the tube (4), having openings (35), the tube (4) being shaped to be able to be engaged and to be able to pivot on said pin (14), and the disc (5) coming to proximity of said transverse wall (13) in this engagement position, said openings (35) of this disc (5) being able, in an angular position of the disc (5), to cover the openings (15) of this transverse wall (13) so as to prevent the flow of air, and, in another angular position, to release these same openings (15) to allow this flow.   9 - Aerator according to one of claims 1, 2 or 4 to 7,   characterized in that said means allowing the opening or closing of the air flow duct comprise: - a bush (51) constituting the aforementioned transmission member, engaged in the tube (4) and able to pivot relative to the latter, this socket comprising two helical lights (52); - A finger (53) housed and able to slide inside this socket (51), this finger (53) comprising two diametrically opposite lugs (54), themselves engaged and able to slide in the two helical slots (52) the socket (51); this finger (53) comprises at least one gripping surface (57) rectilinear, parallel to the sliding axis of this finger (53) in the socket (51); - The housing (2) comprises at least one pivoting flap (60) suitable, in a pivoting position, for closing the air flow duct (12), and, in another pivoting position, for allowing this   flow, this flap (60) comprising a circular gripping surface (58), suitable for engaging with said gripping surface (57) of the finger (53).   - Aerator according to claim 9, characterized in that the finger (53) comprises two gripping surfaces (57) and in that the housing (2) comprises two flaps (60) pivoting in opposite directions, these two flaps (60 ) being simultaneously actuated by the sliding of said finger (53).