Diffuser that attaches specifically to a ventilation grille for diffusing an ambient fragrance

Abstract

The present invention relates to a fragrance diffuser (20) for a grille in a ventilation, air conditioning, and / or air conditioning system of a motor vehicle passenger compartment. The diffuser comprises a front diffuser housing (24), a rear longitudinal mounting rod shaped as a clamp (62) for attaching the diffuser (20), and two opposing clamping arms (100) whose front end sections (102) are connected to a connecting head (110). Each clamping arm (100) has a rear section (106-108) that cooperates with a portion of the grille. The diffuser is characterized in that at least one clamping arm (100) has a front end section (102) that is hinged relative to the connecting head (110), thereby allowing this clamping arm (100) to pivot between a clamped position and an open position, enabling the diffuser to be mounted and removed. Figure for the abstract: 2

Description

Title of the invention: DIFFUSER FOR ATTACHMENT IN PARTICULAR TO A VENTILATION GRILLE FOR DIFFUSIONING AN AMBIENT FRAGRANCE Technical field of the invention

[0001] The present invention relates to a diffuser for perfume, a perfumed composition or an odor.

[0002] The invention relates more particularly to a diffuser intended to be removably fixed on a grille of a ventilation and / or air conditioning system, in particular of a motor vehicle passenger compartment, so as to be traversed by a flow of air to be perfumed. Technical background

[0003] An example of such a diffuser is described and illustrated in the document WO2022 / 117545A1 which includes a front diffusion housing whose function is to contain a carrier of a perfumed substance or composition whose surface is in contact with an airflow that passes through the front housing.

[0004] The diffuser also includes a rear longitudinal fixing rod, a rear end portion of which is shaped into an elastically deformable clamp which, in a known manner, allows the mounting and fixing of the diffuser, for example on a bar of a ventilation grille.

[0005] In a known manner, the clamp is made molded in one piece of plastic material and it has two fixed clamping arms or jaws whose front ends are connected to each other and to a connecting head on which the rear longitudinal fixing rod is here mounted in an articulated manner.

[0006] Each clamping arm is elastically deformable and each rear end section has, on an inner clamping face, several retaining notches.

[0007] The mounting and fixing of the diffuser on a bar of a ventilation grille is carried out by longitudinally fitting the clamp - along the general axis of the clamp - onto the desired bar.

[0008] During this operation, the bar transversely separates the two rear end sections from each other against the elastic restoring force that the clamping arms exert on each other.

[0009] Such a design has several disadvantages: - assembly requires a relatively large effort to be applied; - during assembly (or disassembly) and the longitudinal assembly (or disassembly) stroke, the notched inner clamping faces rub along the bar and are likely to damage it, in particular to damage its coating or paint; The sizing – and the clamping and retention force achieved – of the clamp is a compromise to allow its mounting and attachment to a medium-sized bar. This sometimes leads to mounting difficulties depending on the bar's diameter and / or the spacing between adjacent parallel bars of the ventilation grille in question. There may also be a problem with the clamp's grip.

[0010] The invention aims to remedy all or part of these drawbacks. Summary of the invention

[0011] The invention provides a diffuser for a fragrance, perfumed composition, or scent, suitable for being mounted and removably fixed to a grille of a ventilation, air conditioning, and / or air conditioning system, particularly in the passenger compartment of a motor vehicle, so as to allow an airflow to be perfumed to pass through it, the diffuser comprising: - a front diffusion unit, suitable for containing a carrier of a perfumed substance or composition which is in contact with an airflow that passes through the front unit; - a rear longitudinal fixing rod, a rear portion of which is shaped into a clamp allowing the diffuser to be fixed, and comprising two opposing longitudinal clamping arms, the front end sections of which are connected to a connecting head of the rear longitudinal fixing rod to the front diffuser housing, and wherein each clamping arm comprises a rear end section which is capable of cooperating by clamping with a portion of said grid, characterized in that at least one clamping arm has a front end section which is mounted articulated relative to the connecting head, around a transverse articulation axis, whereby at least one clamping arm is mounted pivotally relative to the connecting head between a closed angular clamping position and an open angular position allowing the diffuser to be mounted and dismounted.

[0012] According to other features of the invention:

[0013] - the front end sections of the two clamping arms are mounted in a hinged fashion one in relation to the other and in relation to the connecting head around a common transverse axis of articulation; - the diffuser includes at least one return spring for at least one clamping arm towards its closed angular position; - the diffuser includes a common return spring for each clamping arm towards its closed angular position; - the diffuser includes disengageable means for immobilizing the front end section of said at least one clamping arm in a determined angular position relative to the front end section of the other clamping arm, in particular in its closed angular position or in its open angular position; - each front end section of each clamping arm has a toothed ring, centered around said articulation axis, and the two toothed rings cooperate to determine a series of relative angular positions of the two clamping arms; - the two front end sections are mounted to move relative to each other, axially along said articulation axis, between an engaged axial position in which the two toothed rings cooperate to determine a determined relative angular position, and a disengaged axial position allowing relative rotation of a front end section of one arm with respect to the front end section of the other clamping arm, and it includes a return spring for the two front end sections towards their engaged axial position; - at least one of the two opposite arms includes a pivoting operating lever for said at least one of the two opposite clamping arms relative to the other of the two opposite clamping arms; - the connecting head of the rear longitudinal fixing rod to the front diffusion housing extends longitudinally towards the rear by a hollow cylinder; - Each clamping arm includes: — a front base which is supported by a piston which is mounted to slide inside said hollow cylinder; — a body extending longitudinally backwards through a rear window of the hollow cylinder, a front end section of the body of each clamping arm being connected to its base in an articulated manner around a transverse articulation axis, by means of which each clamping arm is pivotally mounted relative to the connecting head between a closed angular clamping position and an open angular position allowing the diffuser to be mounted and dismounted, and a portion of each clamping arm is shaped to cooperate with an associated edge of said rear window which causes deformation of said portion elastically deformable joint so that the clamping arm pivots from its open angular position to its closed angular clamping position; - said piston includes a longitudinal pusher for controlling its movements which extends longitudinally between the two clamping arms and whose rear end is suitable for cooperating with a bar of a grid of an aeration, ventilation and / or air conditioning system; - each clamping arm is made in the form of an elastically deformable blade. Brief description of the figures

[0014] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, for an understanding of which reference should be made to the accompanying drawings in which:

[0015] [Fig-1] - [Fig.1] is a general perspective and cross-sectional view by a plane median vertical longitudinal of a diffuser according to the prior art which includes an elastic clamp allowing the mounting and fixing of the diffuser, for example on a bar of a ventilation grille, the known design of which is in one piece with two opposing longitudinal clamping arms that can be elastically deformed;

[0016] [Fig.2] - [Fig.2] is a partial perspective view of a first example of fabrication of a diffuser according to the invention comprising a clamp with two articulated longitudinal opposing arms for clamping, in a closed angular clamping position;

[0017] [Fig.3] - [Fig.3] is an exploded perspective view of all the components illustrated in [Fig.2];

[0018] [Fig.4] - [Fig.4] is a cross-sectional view through a vertical axial plane of the assembly illustrated in [Fig.2];

[0019] [Fig. 5] - [Fig. 5] is a bottom and cross-sectional view through a horizontal plane passing by the central straight section of the return spring of the two articulated clamping arms;

[0020] [Fig.6] - [Fig.6] is a partial perspective view of a variant of the first example of the implementation of a diffuser according to the invention;

[0021] [Fig.7] - [Fig.7] is an exploded perspective view of all the components illustrated in [Fig.6];

[0022] [Fig.8] - [Fig.8] is a partial cross-sectional view through a vertical and transverse plane median of the diffuser in figures 6 and 7;

[0023] [Fig.9] - [Fig.9] is a partial perspective view of a second example of fabrication of a diffuser according to the invention comprising a clamp with two articulated longitudinal opposing arms for clamping, in a closed angular clamping position;

[0024] [Fig. 10] - [Fig. 10] is an exploded perspective view of the entire set of components illustrated in [Fig.9];

[0025] [Fig. 11] - [Fig. 11] is an exploded perspective view of the entire set of components illustrated in [Fig.9], from another perspective angle;

[0026] [Fig. 12] - [Fig. 12] is a partial, cross-sectional view through a vertical plane and median transverse, of the set of components illustrated in [Fig.9];

[0027] [Fig. 13] - [Fig. 13] is a partial perspective view of a third example for the production of a diffuser according to the invention comprising a clamp with two articulated longitudinal opposing arms for clamping, in an open angular position;

[0028] [Fig. 14] - [Fig. 14] is an exploded perspective view of the entire set of components illustrated in [Fig. 13] which are shown in section by a median vertical and transverse plane; [Fig. 15] - [Fig. 15] is a plan and section view by a median vertical and transverse plane of all the components illustrated in [Fig. 13]; [Fig. 16] - [Fig. 16] is a view analogous to that of [Fig. 15] on which the clamping arms are shown in closed angular clamping position. Detailed description of the invention

[0029] For the description of the invention and the understanding of the claims, the vertical and transverse orientations according to the V, T frame indicated in the figures will be adopted without limitation and without limiting reference to terrestrial gravity, the transverse axis extending in a horizontal plane orthogonal to the vertical axis V.

[0030] By convention, the vertical axis V is oriented from back to front and in the direction of passage of the diffuser by a flow of air to be perfumed.

[0031] In the following description of the different embodiment examples, identical, similar or analogous elements will be designated by identical or analogous numerical references by indexing.

[0032] Example of an embodiment according to the prior art - [Fig. 1] Figure 1 shows a diffuser 20, according to the design detailed in document WO2022 / 117545A1, which essentially consists of a front housing 22 which is mounted rotating around the central axis V relative to a fixed assembly including rear means for fixing the diffuser 20.

[0033] The front housing 22 comprises a rear half-housing 24 and a front half-housing 26 which are complementary to form a hollow shell.

[0034] The function of the front housing 22 is to contain a support 46 of a perfumed substance or composition whose surface is in contact with an airflow which passes through the front housing 22 by passing through windows 84, 86.

[0035] The support 46 is for example an impregnated ceramic pebble.

[0036] The support 46 is generally in the shape of a torus which is centrally pierced by an axial bore 47.

[0037] The support 46 is carried by a central shaft 64 whose diameter corresponds to that of the central bore 47 of the support 46.

[0038] The diffuser 20 has a rear fixing rod which extends longitudinally along the vertical axis V and whose rear portion is shaped into an elastic clip 62 which, in a known manner, allows the mounting and fixing of the diffuser 20 for example on a bar of a ventilation grille (Not shown).

[0039] The rear longitudinal fixing rod has a front head 110 for connection to the central shaft 64 which is here assembled to it and rotationally linked by a transverse assembly rod 66.

[0040] In a known manner, the rear end portion shaped into an elastic clamp 62 is made in one piece - for example by molding in plastic material - and it comprises two opposing longitudinal clamping arms 100, each of which comprises a front end section 102.

[0041] The two front end sections 102 are connected to the connecting head 110 of the rear longitudinal fixing rod.

[0042] Each clamping arm 100 has a rear free end section 106 which is suitable for cooperating by clamping, for example with a bar belonging to a ventilation grille.

[0043] For this purpose, each section 106 has a portion of a notched inner face 108, facing the section 106 of the opposite clamping arm.

[0044] Each clamping arm 100 is here able to deform elastically so as to pivot around a horizontal upper axis, substantially at the level of the connecting head.

[0045] First embodiment according to the invention - Figures 2 to 5

[0046] The two clamping arms 100 are two independent arms, here of identical design.

[0047] For its pivoting assembly around the transverse articulation axis A, the front end section 102 comprises a convex semi-cylindrical articulation portion 112 in two parts 116 and 118 separated by a transverse slot 114.

[0048] Part 116 is angularly delimited by a radial end facet 117 while the other part 118 is angularly delimited by a radial end facet 119.

[0049] The two facets 117 and 119 are angularly offset from each other.

[0050] The cooperation of each facet 117 of a clamping arm 100 with the facet 119 of the other clamping arm 100 determines the open angular position maximum of clamp 62, facets 117 and 119 acting as angular stop facets.

[0051] The closed angular position of the clamping clamp is determined by the butting of an internal horizontal edge 120 of one clamping arm 100 with the edge 120 of the other clamping arm 100.

[0052] The connecting head 110 also functions as an articulation head for the articulation portions 112 and for this purpose it includes a concave cylindrical housing 122 of complementary dimensions and whose horizontal axis is orthogonal to the transverse direction T.

[0053] The housing 122 is open at its lower part 124 to allow angular movement of each of the two articulation portions 112.

[0054] Thus, the front end sections 102 of the two clamping arms are mounted articulated relative to each other and to the connecting head 110 around a common transverse articulation axis A.

[0055] The connecting head 110 also has a vertical slot 126 opening at both ends which has a rectangular cross-section.

[0056] At its rear end, the central shaft 64 extends into a lug 128 for hooking and immobilizing in rotation relative to the connecting head 110.

[0057] For this purpose, the hooking tab 128 has a rectangular cross-section complementary to that of the vertical slot 126 in which it is received.

[0058] The rear end of the latching tab 128 has a hook 130 which extends vertically inside the housing 122.

[0059] The two clamping arms 100 are elastically returned to their closed angular clamping position by a return spring 132 which, by way of non-limitation, is here a return spring 132 common to the two clamping arms.

[0060] The return spring 132 is here a wire spring which has a main helical body 134 in two parts 136 connected to each other by a central straight section 138 allowing the hook 130 of the hooking lug 128 to be attached.

[0061] As can be seen in particular in [Fig.5], each part 136 of the body 134 is housed in particular inside the internal concave cylindrical portions opposite the opposite articulation portions 112.

[0062] Each part 136 of the body 134 extends into a vertical return strand 140 which is housed in a complementary groove 142 of an associated clamping arm 100 and whose free end 144 is received in a complementary hole 146 arranged at the rear end of the corresponding groove 142.

[0063] From its closed clamping state, the opening of the clamping clamp 62 is achieved by angularly separating the two rear free end sections 106 from each other, against the elastic return force exerted by the return spring 132.

[0064] This "spreading" can be achieved by directly manipulating the clamping arms 100, or by axially fitting the clamping clamp 62 with independent and articulated clamping arms 100 - along the longitudinal axis of the clamp - onto the desired bar of a ventilation grille.

[0065] During this operation, the bar transversely separates the two rear end sections 102.

[0066] The articulation of each of the two clamping arms 100 relative to the connecting head and the presence of the spring 132 - whose value of the return force is calibrated - make it possible to remedy the disadvantages of a clamp according to the prior art.

[0067] According to an unrepresented variant, to directly operate the two clamping arms, it is possible to provide, on one and / or the other of the two clamping arms 100, an operating lever.

[0068] Variant of the first embodiment according to the invention - Figures 6 to 8 Figures 6 to 8 show a variant of the first example of embodiment in which identical or similar elements and parts or having identical or similar functions are designated by the same numerical references.

[0069] The connecting and articulating head 110 has two transverse lateral cheeks 111 each pierced with a circular hole 113 which extends the concave cylindrical housing 122.

[0070] Each hole 113 receives a projecting lateral end of an associated part 118 of a convex semi-cylindrical articulation portion 112 of a clamping arm 100.

[0071] In the assembled position, the two slots 114 are aligned and the hooking tab 128 extends inside these slots.

[0072] The rear free end 129 of the hooking lug has a concave cylindrical profile and it fits the convex cylindrical profile of the helical body 134 of the return spring.

[0073] The hook 130 is housed in the slot 126 and it acts as a notch which receives a notch 127 belonging to an upper partition 109 of the connecting head 110 (See [Fig.8]).

[0074] Each of the two return arms 140-144 of the common return spring 132 cooperates with a clamping arm 100 having a notch 142 for this purpose.

[0075] Second embodiment according to the invention - Figures 9 to 12 Compared to the first embodiment and its variant embodiment, according to the second embodiment illustrated in Figures 9 to 12, the rear clamping clip 62 comprises: - a 100A clamping arm which is integral with the 110 connection head with which it is here made in one piece; - and another clamping arm 100B, the front end section 102 of which is mounted articulated relative to the connecting head 110, about a transverse articulation axis A, whereby this other clamping arm 100B is mounted pivotally relative to the connecting head 110 – and therefore relative to the front end section of the clamping arm 100A – between a closed angular clamping position and an open angular position allowing the diffuser to be mounted and dismounted.

[0076] Between its front end section 102 and the connecting head 110, the arm 100A has a hollow articulation portion 112A.

[0077] This articulation portion 112A includes a housing 122A suitable for receiving the helical body 134 of the common return spring 132.

[0078] The hollow articulation portion 112A is axially delimited inwards by a toothed ring 150A with regular teeth and is centrally pierced by a bore 152A.

[0079] The toothed ring 150A has a radial notch 154A suitable for receiving and immobilizing an associated return arm 140A belonging to the common return spring 132.

[0080] The front end section 102 of the branch 100B includes a hollow articulation portion 112B.

[0081] This articulation portion 112B includes a housing 122B suitable for receiving the helical body 134 of the common return spring 132.

[0082] The hollow articulation portion 112B is delimited axially towards the inside by a notched crown 150B with regular teeth and is pierced centrally by a blind slot with rectangular section 152B.

[0083] The teeth of the notched crowns 150A and 150B are complementary so that they can cooperate by meshing to define a series of relative angular positions of the two articulation portions 112A and 112B around the axis A, and therefore a series of relative angular positions of the two clamping arms 100A and 100B.

[0084] The toothed ring 150B has a radial notch 154B suitable for receiving and immobilizing an associated return arm 140B belonging to the common return spring 132.

[0085] A horizontal articulation shaft 156 is provided which passes through the central bore 152A and whose free end 160 is fixed in the blind slot with rectangular cross-section 152B.

[0086] As can be seen in particular in [Fig. 12], a helical compression spring 162 is mounted in axial compression between a head 158-159 of the shaft 156, and a portion opposite the external face of the articulation portion 112A.

[0087] Thus, the two toothed rings 150A and 150B are axially stressed against each other by the axial compression spring 162, in an axial position called engaged.

[0088] To rotate the clamping arm 100B relative to the clamping arm 100A, it is necessary to press axially on the head 158-159 (From left to right considering the [Fig. 12]) to axially spread the teeth of the two toothed rings 150A and 150B and thus disengage the rotational coupling that they normally provide.

[0089] In this axial position, known as disengaged, it is then possible to cause such a pivoting.

[0090] The clamping arm 100B has an operating lever 166B which extends through a complementary slot 166A formed in the opposite clamping arm 100A.

[0091] The lever 166B is designed to cause the clamp to close when a bar of the ventilation grille comes into contact with the lever.

[0092] Third embodiment according to the invention - Figures 13 to 16 According to this third embodiment, each of the two clamping arms 100 is independent of the other clamping arm with respect to its pivoting between its different angular positions relative to the connecting head 110, but means for controlling these pivotings make it possible to ensure simultaneous and coordinated pivoting of the two clamping arms 100.

[0093] Moreover, the transverse axis A of articulation of each clamping arm 100 is distinct from that of the other arm, but the very small distance separating the two axes A of articulation, as well as the distance separating the axes of articulation from the front part of the connecting head 110, are such that the pivoting of the two clamping arms, at the level of their rear end sections 106, can be assimilated as being carried out around a substantially common transverse axis of articulation.

[0094] The rear rod 62 of the diffuser is generally in the form of a cylindrical component whose front longitudinal end is constituted by the connecting head 110 and whose rear longitudinal end has a window 210 through which the two opposing longitudinal clamping arms 100 protrude rearward.

[0095] The connecting head 110 of the rear rod 62 extends longitudinally towards the rear by means of a hollow cylinder 200 in two parts, front 202 and rear 204.

[0096] At the connection between its two parts 202 and 204, the hollow cylinder houses an internally toothed ring 206.

[0097] The rear end of the rear part 204 of the hollow cylinder 200 is closed by a rear wall 208 which includes the rectangular rear window 210.

[0098] Two parallel and opposite edges 212 of the window 210 are control edges of the pivoting movements of the clamping arms 100.

[0099] The hollow cylinder 200 houses a piston 214 which is mounted to slide inside said hollow cylinder 200.

[0100] The piston is guided in sliding motion along the longitudinal axis of the hollow cylinder 200 and it can in particular occupy its two extreme longitudinal positions: - rear illustrated in [Fig. 15] corresponding to an extremely open state of the clamping clamp 62; and - before illustrated in [Fig. 16] corresponding to the extreme closed state of the clamping clamp 62.

[0101] At its front longitudinal end 216, the piston 214 here has two diametrically opposed external notches 218 which cooperate with the profiled teeth 207 of the internally toothed ring 206.

[0102] In a known manner, for example in the field of "retractable" ballpoint pens, the cooperation between the notches 218 and the teeth 207 makes it possible to lock the piston 214 longitudinally alternately in each of its two extreme longitudinal positions, and to unlock it to allow passage from one to the other of these two extreme positions.

[0103] To act on the piston 214 and cause its longitudinal movements relative to the hollow cylinder 200 and in particular relative to the internally toothed ring 206, the front end wall 215 of the piston 214 carries a central pusher 220 for controlling its movements which extends longitudinally towards the rear through the window 210.

[0104] The rear free end 222 of the pusher 220 has a concave curved profile and is suitable for cooperating with a bar (not shown) of a grille of an air conditioning, ventilation and / or air conditioning system.

[0105] The two clamping arms 100 are here made in the form of a component 230 made of sheet metal cut and folded in one piece integrating the two clamping arms 100 and a common base 232 which connects the two clamping arms 100 together.

[0106] The portion constituting the common base 232 is fixed on the external face of the front end wall 215 of the piston 214.

[0107] At each of its two opposite transverse ends, the base portion 232 is bent into a hairpin shape to form a joint portion 234 from which the body of each clamping arm 100 extends longitudinally towards the rear.

[0108] Thus, the front end portion 102 of each clamping arm 100 is connected to the common base 232 and is mounted articulated relative to the latter - and therefore relative to the connecting head 110 - around a transverse articulation axis A.

[0109] The free or almost free state of each clamping arm 100 is that illustrated in particular in [Fig. 15] in which the clamping clamp 62 is open.

[0110] The cooperation of the external lateral faces of the front end portions 102 each with an associated edge 212 of the window 210 also has the function of elastically maintaining the piston 214 in its rear longitudinal position with the articulation portions 234 bearing against the internal face of the rear wall 208 of the hollow cylinder 200.

[0111] Starting from the state illustrated in [Fig. 15], by exerting a pushing force - from bottom to top considering the orientation of this figure - on the end 222 of the longitudinal pusher 220, the piston 214 is unlocked and moved forward inside the hollow cylinder 200 until it reaches its position illustrated in [Fig. 16] - in which it is again locked - corresponding to the closed state of the clamping clamp.

[0112] Indeed, as can be seen in particular in [Fig.15], the body of each blade constituting a clamping arm 100 is inclined with respect to the longitudinal axis of movement of the piston and it thus constitutes an inclined ramp profile which cooperates with an associated control edge 212 of the window 210 to cause its pivoting and obtain clamping by mutual rapprochement of the rear end sections 204.

Claims

Demands

1. A diffuser (20) for perfume, a perfumed composition, or an odor, suitable for being mounted and removably fixed on a grille of a ventilation, air conditioning, and / or air conditioning system, in particular of a motor vehicle passenger compartment, so as to be traversed by a flow of air to be perfumed, the diffuser comprising: - a front diffusion housing (22), suitable for containing a support (46) for a perfumed substance or composition which is in contact with an airflow that passes through the front housing; characterized in that it comprises a rear longitudinal fixing rod, a rear portion of which is formed into a clamp (62) for fixing the diffuser (20) and comprising two opposing longitudinal clamping arms (100), the front end sections (102) of which are connected to a connecting head (110) of the rear longitudinal fixing rod to the front diffusion housing (22),in which each clamping arm (100) has a rear end section (106-108) which is capable of cooperating by clamping with a part of said grid, in which at least one clamping arm (100) has a front end section (102) which is mounted articulated relative to the connecting head (110), about a transverse articulation axis (A), by which this at least one clamping arm (100) is mounted pivotally relative to the connecting head (110) between a closed angular clamping position and an open angular position allowing the mounting and dismounting of the diffuser, in that the front end sections (102) of the two clamping arms (100) are mounted articulated relative to each other and relative to the connecting head (110) about a common transverse articulation axis (A),and in that the diffuser comprises at least one spring (132) for returning at least one clamping arm (100) to its closed angular position.

2. Diffuser according to claim 1, characterized in that it comprises a common spring (132) for returning each clamping arm (100) to its closed angular position.

3. Diffuser according to any one of the preceding claims, characterized in that the two clamping arms (100) are two independent arms of identical design.

4. Diffuser according to any one of the preceding claims, characterized in that the front end section (102) of each clamping arm (100) comprises a convex semi-cylindrical articulation portion (112) in two parts (116, 118) separated by a transverse slot (114), one (116) of the two parts (116, 118) being angularly delimited by a radial end facet (117) while the other part (118) is angularly delimited by a radial end facet (119), the two facets (117, 119) being angularly offset from each other, such that the cooperation of each facet (117) of one clamping arm (100) with the facet (119) of the other clamping arm (100) determines the maximum open angular position of the clamp (62), the facets (117, 119) acting as angular stop facets.

5. Diffuser according to the preceding claim, characterized in that the closed angular position of the clamping clamp is determined by the butting of an internal horizontal edge (120) of one clamping arm (100) with the edge (120) of the other clamping arm (100).

6. Diffuser according to claim 4 or 5, characterized in that the connecting head (110) also functions as an articulation head for the articulation portions (112) and for this purpose comprises a concave cylindrical housing (122) of complementary dimensions and whose horizontal axis is orthogonal to a transverse direction (T).

7. Diffuser according to the preceding claim, characterized in that the connecting head (110) also has a vertical slot (126) opening at both ends which has a rectangular cross-section, in that, at its rear end, the central shaft (64) extends into a lug (128) for hooking and immobilizing against rotation relative to the connecting head (110), the hooking lug (128) having a rectangular cross-section complementary to that of the vertical slot (126) in which it is received, in that the rear end of the hooking lug (128) has a hook (130) which extends vertically inside the housing (122), in that the return spring (132) is here a wire spring which has a main helical body (134) in two parts (136) connected to each other by a central straight section (138) allowing the hook (130) of the hooking lug (128) to be attached.

8. Diffuser according to the preceding claim, characterized in that each part (136) of the body (134) is in particular housed inside the internal concave cylindrical portions opposite the opposite articulation portions (112).

9. Diffuser according to any one of the preceding claims, characterized in that at least one (100B) of the two opposite arms has a lever (166B) for pivoting said at least one (100B) of the two opposite clamping arms relative to the other (100A) of the two opposite clamping arms.

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