WO2007090998A2

WO2007090998A2 - Fluid product dispenser

Info

Publication number: WO2007090998A2
Application number: PCT/FR2007/050773
Authority: WO
Inventors: Patrick Muller
Original assignee: Valois Sas
Priority date: 2006-02-09
Filing date: 2007-02-09
Publication date: 2007-08-16
Also published as: FR2897046A1; WO2007090998A3; FR2897046B1

Abstract

The invention relates to a fluid product distributor comprising a fluid product container (1) provided with a neck (14) defining an opening (15) and a longitudinal axis X and formed by an external thread (142), and a dispensing element (2, 3, 4, 5) which is mounted on the neck (14) of the container (1), said element comprising an assembly ring (2) provided with an internal thread that can co-operate with the external thread (142) of the neck in order to screw the ring (2) to the neck (14), the ring (2) and the neck (14) forming anti-unscrewing means (146, 26) for rendering the unscrewing difficult such that the ring can only be unscrewed from the neck by exerting a torque much higher than that necessary for screwing the ring onto the neck. The neck (14) comprises at least one anti-unscrewing housing (145 ; 145' ; 145') and the ring (2) comprises at least one anti-unscrewing teat (26 ; 26' ; 26' ; 26''), said teat being received in the housing in the end position. The invention is characterised in that the housing (145 ; 145' ; 145') comprises an anti-unscrewing surface (146) against which the teat is strongly applied when an unscrewing torque is exerted from the end position, the teat disengaging from said surface when the torque exceeds a pre-determined value.

Description

Fluid dispenser

The present invention relates to a fluid dispenser comprising a fluid reservoir provided with a neck. This collar defines an opening that allows the outside to communicate with the inside of the tank. The neck is also formed with an external thread. On the other hand, the dispenser comprises a dispensing member mounted on the neck of the reservoir, this member comprising a screw-in mounting ring provided with an internal thread adapted to cooperate with the external thread of the neck to fix by screwing the ring on the neck. This is a very classic design for a fluid dispenser in the fields of perfumery, cosmetics or even pharmacy.

From the prior art, it has long been known that type of fluid dispenser that uses a tank, glass, metal or plastic, cylindrical circular, oblong, square or rectangular or non-cylindrical. The reservoir generally comprises a body which internally defines the useful volume of the reservoir and a neck which extends in the upper part of the body from a shoulder. In the present invention, the neck is threaded externally with a helical spiral thread. On the other hand, the dispenser member may be an assembly of several parts or elements, including among others a mounting ring intended to be screwed onto the threaded neck of the reservoir. This mounting ring is generally used for the establishment of a dispensing element, such as a pump or a valve. The ring can directly serve alone to maintain the pump or the valve on the neck of the container, or alternatively, the dispenser member may comprise an additional fastener intended to be mounted on the ring so as to maintain between them the pump or the valve. On the other hand, the dispensing member also generally comprises a dispensing head in the form of a pusher on which the user can press with the aid of one or more fingers to actuate the pump or the valve and thus distribute fluid product from the reservoir. With regard to a fixing ring to be screwed onto a threaded neck, it is generally possible to unscrew the mounting ring from the neck. This allows the user to have access to the interior of the tank so as to recover for example the remaining fluid that adheres to the inner wall of the tank. This is typically the case for cream dispensers, or more generally viscous fluid: in fact, it is known through consumer tests that the cream dispenser user appreciates the ability to remove the dispensing member of the dispenser. reservoir to be able to take the remainder of fluid once the dispensing member no longer allows a normal distribution of fluid product.

In other cases, although removal of the dispenser member from the neck is undesirable, this possibility still exists since the screw ring is of course also unscrewable.

A primary object of the present invention is to prevent, delay removal of the ring or increase the difficulty of removing the dispenser dispenser member.

To do this, the present invention proposes that the ring and the collar together form anti-unscrewing means able to make final screwing or unscrewing difficult, so that the ring is no longer unscrewable or can be unscrewed from the that of exerting a torque much higher than that necessary to screw the ring on the neck. It is thus possible in the context of the invention that it is no longer possible to remove the ring from the neck by unscrewing. Preventing or hardening the unscrewing of the ring reassures the user of the dispenser, because he knows that the unscrewing or more generally the disassembly of the dispenser is difficult or impossible. It is even possible to use the anti-unscrewing means as first-use safety means without departing from the scope of the invention. Indeed, the destruction or damage of the anti-unscrewing means in case of unscrewing can give a visible and simple indication to the user that someone intentionally disassembled the dispenser. According to an advantageous characteristic of the invention, the ring reaches a final position at the end of screwing of the ring on the neck, the anti-unscrewing means only being operative in this final position. In other words, the anti-unscrewing means do not intervene during the screwing, except near and / or at the final screwing position.

According to another aspect of the invention, the anti-unscrewing means may comprise elastic means which are substantially relaxed in the end position, but constrained to the maximum just before reaching the final position. Thus, just before reaching the final position during screwing, the elastic means are deformed to the maximum, and relax immediately and suddenly when the final screwing position is reached. This engagement technique can be likened to a snap.

According to a practical embodiment of the invention, the neck may comprise at least one anti-unscrewing housing and the ring comprises at least one anti-unscrewing nipple, the nipple being received in the final position in the housing. . Advantageously, the stud is elastically displaceable axially along the longitudinal axis or radially relative to this axis with a certain resilience to reach, in final position, in the housing. Advantageously, the stud is formed on a flexible tab, so that the stud is resiliently movable along the longitudinal axis by elastic deformation of the tab, the tab being substantially undeformed in the end position. Preferably, the tab defines two opposite ends connected to the remainder of the ring, the stud being advantageously located substantially in the center of the tab.

The elasticity is here provided by the ring, because it is often made of plastic. However, it is also possible to achieve the elasticity at the neck, but it requires to realize the reservoir or at least a portion of the reservoir in a deformable material, such as plastic. As a result, in most cases, the elasticity will be provided by the ring.

On the other hand, it should be noted that the elasticity of the nipple can be adjusted by varying factors, such as the length or thickness of the nipple. paw. The size of the nipple is also a parameter which makes it possible to vary the elasticity.

According to another advantageous characteristic of the invention, the housing comprises an anti-unscrewing surface against which the pin is strongly supported when a unscrewing torque is exerted from the final position, the pin remaining blocked against this surface or disengaging from this surface when the torque exceeds a predetermined value. The configuration of the contact between the pin and the anti-unscrewing surface is also a parameter that varies the difficulty of unscrewing. By providing a slightly inclined anti-loosening surface or a rounded nipple, the difficulty of unscrewing, that is to say the torque required for unscrewing, can be reduced. Conversely, by providing a perfectly vertical and perpendicular anti-unscrewing surface and a pin capable of coming into direct contact with the anti-unscrewing surface, the predetermined value of the maximum torque can be increased so that that the ring is not even unscrewable collar. Thus, one can play on various factors to set the torque required to unscrew the ring from the final screwing position: this torque can vary from a small value to infinity.

According to another interesting aspect of the invention, the housing is bordered by an access ramp on which the nipple slides before coming to lodge in the housing, the nipple moving elastically and progressively relative to the remainder of the ring to measure that it gets closer to the housing, the nipple snapping elastically into the housing. The sliding of the pin on the access ramp generates only a minor friction so that the screwing torque is only slightly increased. Of course, this torque increases anyway as one approaches the housing, since the nipple moves to a maximum. However, as soon as the pin arrives in the final position, it can resume its initial position substantially without constraint in the housing. However, it can be provided that the stud is not completely released inside the housing, to increase the quality of contact or engagement between the stud and the anti-unscrewing surface. The present invention can therefore be considered as providing a detachable snap or definitive between the ring and the collar in final screwing position. In some cases of application, in which it may be appreciated to have access to the interior of the tank, the anti-unscrewing means will be defeasable. This is for example the case when the distributor is a cream dispenser. On the other hand, when it is a pharmaceutical dispenser, it is preferable that the anti-unscrewing means prevent or prevent any removal of the ring, except to destroy the anti-unscrewing means or even the ring.

According to another advantageous feature of the invention, the ring and the collar may together form stop means in the final screwing position, the anti-unscrewing means being operative in this final stop position, the stop means being advantageously separate from the anti-unscrewing means, the abutment means comprising a stop end wall against which a stop lug formed by the ring comes into abutment in final screwing position. These abutment means not only allow to fix accurately the final mounting position but also determine the orientation of the ring relative to the neck in final screwing position. This is particularly advantageous when the reservoir has a non-circular section, for example square or rectangular, and the ring has a corresponding square or rectangular configuration. In this case, it is imperative that the ring is perfectly oriented on the neck of the tank. Thus, the abutment means serve to lock the ring on the neck in the direction of screwing, while the anti-unscrewing means allow to lock in a removable or permanent manner the ring on the neck in the direction of unscrewing. The anti-unscrewing means and the abutment means may be partially or totally merged, but preferably, they are perfectly distinct and spaced from each other in space. In the first case, it is possible for example to imagine that the housing of the anti-unscrewing means comprises a stop abutment wall which is arranged facing the anti-unscrewing surface and that the nipple has a suitable configuration so as to contact both the anti-unscrewing surface and the stopper wall. A small game is however tolerable. However, a complete separation of the stop means and the anti-unscrewing means is however preferred.

These stop means constitute a characteristic which can be protected independently of the anti-unscrewing means. According to a practical embodiment, the neck may comprise a substantially cylindrical barrel on which the external thread is formed, this barrel being surrounded at its base by a ring, the housing, the access ramp and, advantageously, the end stop wall being formed by this crown. Thus, the anti-unscrewing means are not located in the direct vicinity of the thread. It is thus understood that the anti-unscrewing means become operational only at the end of screwing, when the ring will come into contact with the ring.

According to another aspect of the invention, the dispensing member may further comprise a pump or a valve mounted on the mounting ring to be screwed.

It can also be provided that the anti-unscrewing means are at least partially destructible in case of forced unscrewing, thus giving the user a visual indication of the first use. The nipple and / or the leg can be permanently damaged or destroyed in case we want to unscrew the neck ring. Thus, the damaged nipple and / or leg would give a direct visual indication to the user that someone has attempted and succeeded in unscrewing the neck collar.

The invention will now be more fully described with reference to the accompanying drawings giving by way of non-limiting example an embodiment of the invention.

In the figures: FIG. 1 is an exploded perspective view of a fluid dispenser according to one embodiment of the invention; FIG. 2 is an enlarged perspective view of the upper part of the reservoir of FIG. appear the neck made according to the invention, FIG. 3 is also a perspective view of the neck of FIG. 2 on which a mounting ring according to the invention has been mounted; FIGS. 4 and 5 are detailed views showing two variant embodiments of the invention; FIG. 6 is a perspective view substantially from above of the assembly represented in FIG. 3 revealing the elastic tabs of the ring, FIG. 7 is a view similar to that of FIG. 6 for a variant embodiment of the tabs, FIGS. 8a and 8b are views in perspective and from above of a reservoir according to a second embodiment of the invention, FIG. 9 is a perspective view of the reservoir of FIGS. 8a and 8b with a mounting ring mounted on it and FIG. 10 is a top view of the mounting ring of FIG. 9.

Reference will first be made to FIG. 1 to describe in a general manner the various constituent elements of a fluid product dispenser produced according to a first embodiment of the invention. In this first nonlimiting embodiment, the dispenser essentially comprises five parts or elements, namely a reservoir 1, a screw-in mounting ring 2, a pump or a valve 3, a cap 4 and a dispensing head 5 under the shape of a pusher. The dispenser may further comprise other parts, such as for example one or more seals intended to achieve necessary seals. This distributor can be divided into two subassemblies, namely a first subassembly constituted solely by the tank 1, and a second subassembly constituted by the ring 2, the pump or valve 3, the cover 4 and the pusher 5 This second subassembly may be generally referred to as a dispensing member, since it makes it possible to dispense fluid stored inside the tank 1. The screw-in mounting ring 2 serves to fix the organ of distribution on the reservoir, the pump or valve 3 acts as a motor for taking fluid from the reservoir, the cover 4 can have a function fixing or holding the pump or valve on the ring 2, but can also have an aesthetic function. As for the pusher 5, it has a function of actuating the pump or valve and comprises for this purpose a dispensing orifice and a bearing surface on which the user can press with the aid of one or more fingers . The pusher is not a critical element for the present invention. It may be devoid of dispensing orifice.

The reservoir 1 comprises a body 10 which is internally hollow so as to define an internal volume which defines the useful volume of the reservoir. This body 10 comprises side walls 11, a bottom 12 and a shoulder 13. The side walls 11 are here substantially flat and are four in number, so that the overall configuration of the body 10 has a substantially square or rectangular cross section. Other geometric shapes are however possible, such as perfectly circular or oblong cylindrical. The shape of the tank is not a limiting element of the present invention. In a very general manner, it can be said that the body 10 of the reservoir has a generally cylindrical square configuration. The reservoir 1 also defines a neck 14 which extends upwards from the shoulder 13. The neck 14 defines an opening 15 which communicates the inside of the reservoir with the outside. According to the present invention, the neck 14 defines a substantially cylindrical barrel 141 which ends at its upper end by an annular edge

144. At its lower end, the shaft 141 connects to the shoulder 13 via a ring 143 which has a diameter greater than that of the shaft. The ring 143 thus makes a kind of step or step between the shoulder 13 and the shaft 141. The ring defines a cylindrical peripheral wall and an annular upper edge. According to the invention, the outer wall of the barrel 141 is provided with an external thread 142 which extends helically around the barrel. The threading 142 is made by one or more threads which project from the substantially cylindrical barrel 141. Of course, the thread 142 can be made in one piece with the barrel 141. Preferably, the reservoir 1 is made in one piece in one piece. glass, but it can also be made of plastic, metal or from any suitable material. As can be seen in Figure 2, the ring 143 is interrupted on a portion of its periphery so as to form a housing 145 which ends with two radial walls 146 and 147. The housing 145 interrupts the outer edge of the crown 143 and thus forms a recess that extends over an arc of a circle. The ring 143 may be provided with a single housing 145, or alternatively, there may be several housings 145 distributed around the crown 143. In the embodiment shown in the figures, there are two housings 145, but one only is visible.

The reservoir 1 defines as a whole a longitudinal axis X which extends through the neck substantially at its center. Thus, the thread 142 extends helically around this axis X on the outside of the shaft 141. It can also be said that the end walls 146 and 147 which delimit the angular extent of the housing 141 extend into respective radial vertical planes in which the X axis is inscribed. It may also be noted that the surface 146 has an upper edge which comes to the level of the annular upper edge of the ring. As will be seen below, the portion of this annular upper edge that is adjacent to the upper edge of the surface 146 serves as an access ramp 148 within the housing 145.

Among the constituent elements of the dispensing member, we will focus more particularly on the mounting ring 2 to be fixed by screwing on the threaded neck 14 of the reservoir. This ring 2 comprises a peripheral skirt 21 which has a square configuration. Above this skirt 21, the ring forms a plate 22 which is externally square but internally circular. This is more visible in FIGS. 4 and 5. From this plate 22, the ring forms a dome 23 which ends with a fixing sleeve

24 internally, the ring 2 forms an internal thread (not shown) which is located at the inner wall of the dome 23. The upper part of the dome which is tightened to then form the bushing 24 is intended to come into pressed contact on the annular edge 144 of the neck 14. A toric seal may optionally be interposed between the edge

144 and the dome 23. Thus, one can screw the ring 2 on the threaded neck 14 of the reservoir 1 until a sealed contact is made, for example at the annular edge 144 of the neck. This remains quite classic for a screw ring. It should be noted, however, that the tank has a square cross section, as the skirt 21 of the ring. Therefore, it is essential to correctly orient the ring 2 on the tank 1 so that the skirt 21 is oriented correctly relative to the square configuration of the tank. We will see below how we certainly obtain this correct orientation.

According to the invention, the ring is formed with an anti-unscrewing nipple 26, which is visible in FIG. 3. Advantageously, this nib 26 is formed at the level of the plate 22 more precisely at its lower wall facing the low. In the embodiment described in the drawings, the ring comprises two pins 26, just as the reservoir comprises two housings 145. The pin 26 can simply be in the form of a boss or a projection which projects from of the lower wall of the plate 22. According to the invention, it is preferable to make the stud 26 on an elastically deformable tab 226 or 226 ', as can be seen in FIGS. 4 and 5. In FIG. 226 is delimited by two longitudinal slots 227 so that the tab 226 is connected by its two opposite distal ends to the remainder of the ring. It can also be said that the longitudinal lateral edges of the tab 226 are bordered by two respective slots 227. The stud 26 is preferably arranged in the center of the tab 226. As a variant shown in FIG. 7, the tab 226 'may be delimited. by a U-shaped slit 227 '. The embodiment of FIG. 6 is however preferred because it ensures perfect symmetry of the deformation of the tab 226, while the tab 226' gives rise to an asymmetry of deformation due to the orientation of the slit 227 'U-shaped. One can of course play on the length and thickness of the tab to vary its elastic deformation capacity. One can also play on the configuration of the nipple 226, such as its size, but also its shape. It can indeed be noted in Figure 3 that the stud 26 has a rounded outer shape, which allows unscrewing of the ring. It is also possible to form the nipple with a more angular which will prohibit unscrewing, as shown in Figures 4 and 5. It is easily understood that the pin 26 'of Figure 4 will create a blockage in the manner of a detent which will prohibit unscrewing, except at destroy it. It may also be noted that the housing 145 'is smaller than the housing 145. On the contrary, the inclined nipple 26 "of Figure 5 will allow unscrewing out of the housing 145'.

According to the invention, the two studs 26, 26 'or 26 "which are advantageously mounted on resilient tabs 226, 226' are arranged under the plate 22 so that they will be housed at the end of the screwing. ring 2 on the neck 14 in the housing 145 or 145 'just behind the surface 146. This is shown in Figures 3, 4 and 5 which correspond to the final screwing position of the ring 2 on the neck 14. It can be seen that the nipple is positioned in the housing in contact with the surface 146 or close to this surface 146 with a light clearance.To allow the nipple to gain this final position inside the housing, it is necessary that the nipple slides first on the access ramp 148 of the crown 143. For this, it is necessary that the nipples can move slightly upwards relative to the remainder of the ring 2. This can be done by an elastic plastic deformation of the plate 22, but preferably, as we saw previously , the stud can be formed on an elastic tab 126 or 126 'which increases the deformation capacity of the plate 22 at this location.

Thus, when the stud 26, 26 'or 26 "will come into contact with the access ramp 148, the continuation of the screwing will cause deformation of the tab which will allow the pin to slide on this ramp 148, until at the moment when it will be able to snap inside the housing 145 or 145 'This snap-in results in a relaxation of the elastic tab which returns to its initial position in which it is not substantially subjected to any constraint. However, it can be envisaged that the tab remains partially constrained even when the stud is in the housing, and it has just been seen how the nipple 26, 26 'or 26 "can gain its final position of screwing by snapping into the housing 145 or 145. . Due to the radial orientation of the surface 146, and the downward projection made by the pin, it is easy to understand that an unscrewing torque will cause the pin to come into pressed contact against the surface 146, which the it can thus be described as anti-unscrewing surface. Depending on the configuration of the surfacel46 and the stud 26, 26 'or 26 ", the disengagement of the stud from the housing 145 or 145' will be allowed or not, by providing a free stop between the surface 146 and the stud 26 ' , as in FIG. 4, any disengagement of the stud from the housing 145 'will be practically prohibited, so that the screwing of the ring on the neck is final, while rounding the stud 26, as shown in FIG. or by slightly inclining the surface 46, this allows the pin 26 to disengage from the housing 145 by applying an unscrewing torque having a predetermined value, or the pin 26 "can be tilted as shown in FIG. it is possible to screw the ring 2 on the neck 14, but it is impossible or difficult to unscrew the neck ring. The elasticity of the ring which allows the stud to move axially determines the hardness of the screwing at the end of the screwing stroke, while the configuration of the surface 146 and the stud 26, 26 'or 26 "will determine the capacity of the stud to disengage or not the housing, and this with a predetermined unscrewing torque.

It should be noted that the engagement of the stud 26, 26 'or 26 "in the housing 145 or 145', which constitutes means of anti-unscrewing, is operative only at the end of screwing or at the beginning Unscrewing from the final screwing position Otherwise screwing or unscrewing is not affected by the anti-unscrewing means at all.

In the embodiment described, the stud has been formed on the ring 2. However, it is also possible to form the pin on the tank 1. In this case, it is possible for example to provide that the ring 2 is formed with a housing. likely to move elastically. This housing may for example be formed at a flexible tab, such as the tab 226 or 226 '. On the other hand, it is more difficult to achieve the elastic deformability characteristic at the neck, since this is generally made of a very hard material such as glass or metal. However, we can imagine that the reservoir is made of a deformable plastic material. In this case, the elastic deformability characteristic can be achieved at the reservoir.

Referring again to Figure 3, it can be seen that the ring 2 is also provided with a stop lug 27, which is advantageously also formed at the lower wall of the plate 22. This pin 27 has the function of abut against the surface 47 which delimits the housing 145 on the right, as can be seen in Figure 2. Thus, this surface 147 serves a frank abutment wall function. By frank stop, it is meant any direct contact that no longer allows any relative movement. Thus, the surface 147 preferably extends perfectly radially and vertically with respect to the axis X. Similarly, the lug 27 comprises a corresponding surface which also extends radially and vertically. Thus, these two surfaces can varnish in mutual contact so as to accurately determine a clear or determined position. So that the lug 27 can come into abutting contact with the surface 147, the housing 145 has been made with a certain angular size, because it is necessary to allow the lug 27 to enter the housing 145 without coming jamming on the ramp 148. Thus, the angular length of the housing 145 is directly determined by the stroke of the pin 27 to its final stop open position against the surface 147. With a housing 145 which extends approximately on a quarter circle, it is ensured that the lug 27 can enter the housing 145 without coming into contact with the access ramp 148. It should be noted that the lug 27 does not need to be able to move elastically, so that it is not necessary to mount it on a flexible lug. In any case, the greater the rigidity of the lug 27, the better the contact is with the surface 147.

According to the invention, the lug 27 reaches its abutment position against the surface 147 when the stud 26 snaps into the housing 145 just behind the anti-unscrewing surface 146. This is shown in FIG. It should be noted that the anti-unscrewing means consisting of the combination of the surface 146 with the stud 26 are completely distant and spatially and functionally abutment means constituted by the surface 147 and the lug 27. However, it is possible to imagine that the free stop is achieved by the pin: for this, one can for example provide a much smaller housing so that the pin once in engagement in this housing will come into contact with both the surface 146 and the surface 147. This is the case of the stud 26 "of FIG. 5 which defines an inclined section in contact with the surface 146 and a vertical section parallel to and in abutting contact with the wall 147. However, since it is preferably that the stud is mounted on an elastic tab, it is difficult to obtain a free stop comparable to that of the pin 27 in contact with the surface 147. Therefore, it is better to clearly distinguish the means of anti-unscrewing of the stop means at the end of screwing.

It should also be noted that the anti-unscrewing means can be implemented without stop means, as is the case in FIG. 4; the stud 26 'is snapped behind the surface 146, but nothing comes into contact with the surface 147, which is used in FIGS. 3 and 5 of the abutment wall, respectively for the stud 27 and the double function stud 26 ".

It may also be noted that it is possible to combine the embodiments of FIGS. 4 and 5 so as to obtain an "inducible" pin that also provides a screw stop function.

Reference will now be made to FIGS. 8, 8b, 9 and 10 to describe a second embodiment according to the invention. Only the tank 1 and the mounting ring 2 have been shown in the figures. The other components of the dispenser may be similar or identical to those of the first embodiment. Thus, the dispenser, once assembled, will have a configuration that may be identical to that of the dispenser of FIG. 1. Indeed, the cover 4 masks both the neck of the reservoir and the mounting ring 2.

The reservoir 1, in this second embodiment, has a general configuration that may be similar or identical to that of the reservoir of the first embodiment. Indeed, the reservoir may define a body 10 of substantially square cross section defining an upper shoulder 13 from which extends axially a neck 14. This neck 14 defines a substantially cylindrical barrel 141 which extends upward axially from a base ring 143 which makes the junction between the barrel 141 and the shoulder 13. The outer wall of the barrel 141 is provided with a helical thread 142. Referring to FIG. 8b, it can be seen that the crown 143 has a oblong or elliptical shape, while the 141 has a circular shape. In this second embodiment, the ring 143 forms two housings 145 "which are here diametrically opposite, these housings 145" provide a radial notch at the outer periphery of the crown 143. This notch extends to the level of 13. In addition, the was 141 is provided with a buttress forming an abutment surface 147. The buttress is located above the crown 143 against the end 141 at the end of the threading 142. abutment 147 will perform the same function as the abutment surface of the first embodiment. As for the housing 145 ", it will also fulfill the same function of anti-unscrewing as the housings 145 and 145 'of the first embodiment Thus, the housing 145" also includes an anti-unscrewing surface 146. This surface 146 does not extend perfectly radially, and is even rounded. It can be said that the surface 146 is inclined with respect to the radial direction. The housing is thus substantially open.

Referring now to Figures 9 and 10, there is shown the fixing ring 2 to be mounted on the neck of the tank of Figures 8a and 8b. Again, the ring 2 may have a general configuration substantially similar or identical to that of the first embodiment. The ring comprises an annular peripheral plate 22 from which extends the dome 23 which is surmounted by the sleeve 24 on which is mounted the pump or the valve. In this second embodiment, the ring comprises two anti-unscrewing nipples 26 '"which are here arranged diametrically opposite the anti-unscrewing nipples are formed on respective resilient tabs 226". These legs are connected at each end to the rest of the ring. Thus, the nipples, which are advantageously centrally disposed on the tabs, can move by elastically deforming the tabs. Unlike the first embodiment in which the tabs make it possible to move the pin axially, in this second embodiment, the tabs allow a radial displacement of the pins. nipples with respect to the X axis of the cervix. Apart from this difference in the direction of nipple movement, the ring of the second embodiment is substantially similar or identical to that of the first embodiment. By screwing the collar on the neck, the pins 26 '"will come at the end of the race to lodge in the housing 145". To achieve this final mounting position shown in Figure 9, the studs 26 '"will slide on the peripheral wall of the ring 143 which forms a kind of ramp 148. The deformation of the stud will be amplified because the crown 143 n It is not circular but elliptical or oblong, so that the tabs 26 "will be deformed to the maximum just before the nipples 26" snap inside the housings 145 ". Although not shown, the ring of this second embodiment can also incorporate a stop lug intended to come into abutment against the abutment surface 147 formed by the neck.

It may be noted that the studs 26 "have a rounded configuration which is substantially complementary to that of the housings 145". The nipples will fit perfectly in the housing, but it will be possible to disengage the nipples of the housing with a predetermined unscrewing torque, because of the rounded configuration and / or inclined nipples 26 "and anti-unscrewing surfaces 146 This disengagement is done without breaking the legs 226 ". Unscrewing is thus possible, but with a torque greater than that of the screwing.

Thus, the major difference between the two embodiments lies in the fact that the nipples move along different axes. Apart from this distinction, the ring of the second embodiment can advantageously implement all the additional functions of the ring of the first embodiment. Indeed, the stud 26 '"and its associated housing 145" can be configured to perform a hardened or permanent anti-unscrew function, or a first-use safety function.

The difficult but possible unscrewing comes from the configuration of the heads and / or anti-unscrewing surfaces, which may for example be rounded and / or inclined. Thanks to the invention, there is obtained a dispenser whose dispensing member can easily be screwed onto a threaded neck until reaching a final fixed screwing position, and which can not be unscrewable or hardly unscrewable, and this thanks to anti-unscrewing means which are operative only momentarily at the end of screwing.

Claims

claims

1.- Fluid dispenser comprising:

- a fluid reservoir (1) provided with a neck (14) defining an opening (15), the neck being formed with an external thread (142), the neck defining a longitudinal axis X, and - a dispensing member (2, 3, 4, 5) mounted on the neck (14) of the reservoir (1), this member comprising a mounting ring (2) provided with an internal thread adapted to cooperate with the external thread (142) of the neck for fixing by screwing the ring (2) on the neck (14), wherein the ring (2) and the neck (14) together form anti-unscrewing means (146, 26) adapted to make unscrewing difficult, so that the ring can be unscrewed from the neck by exerting a torque much greater than that necessary to screw the ring on the neck, the neck (14) comprising at least one anti-unscrewing housing (145; 145 ' 145 ") and the ring (2) comprises at least one anti-unscrewing nipple (26; 26 '; 26"; 26' "), the nipple being received in the final position in the housing, characterized in that that e housing (145; 145 '; 145 ") comprises an anti-unscrewing surface (146) against which the pin is strongly supported when a unscrewing torque is exerted from the final position, the pin disengaging from this surface when the torque exceeds a predetermined value .

2. A fluid dispenser according to claim 1, wherein the anti-unscrewing surface (146) and / or the pin (26; 26 '; 26 ") have a configuration, advantageously inclined or rounded, allowing the pin to disengage the housing by simply unscrewing the ring with a predetermined minimum unscrewing torque.

3. Fluid dispenser according to claim 1 or 2, wherein the ring (2) reaches a final position at the end of screwing of the ring. on the collar, the anti-unscrewing means (146, 26) only being operative in this final position.

4. A fluid dispenser according to claim 1, 2 or 3, wherein the anti-unscrewing means (146, 26) comprises resilient means (226; 226 '; 226 ") which are substantially released in the end position. but constrained to the maximum just before reaching the final position.

5. A fluid dispenser according to any one of the preceding claims, wherein the stud is resiliently movable with a certain resilience to reach, in final position, in the housing.

6. A fluid dispenser according to claim 5, wherein the stud (26; 26 '; 26 "; 26'") is formed on a flexible tab (226; 226 '; 226 ") so that the stud is movable elastically by elastic deformation of the tab, the tab being substantially undeformed in the end position.

7. A fluid dispenser according to claim 6, wherein the tab (226; 226 ") defines two opposite ends connected to the rest of the ring, the stud (26; 26 '; 26"; 26' ") being advantageously located substantially in the center of the paw.

8. A fluid dispenser according to any one of the preceding claims, wherein the housing (145; 145 '; 145 ") is bordered by an access ramp (148) on which the stud (26; 26'; 26 "; 26 '") slides before coming to lodge in the housing, the nipple moving elastically and gradually relative to the remainder of the ring to As it gets closer to the housing, the nipple snapping elastically into the housing.

9. A fluid dispenser according to any one of the preceding claims, wherein the ring (2) and the neck (14) together form stop means (147, 27) in final screwing position, the means of anti-unscrewing (146, 26) being operative in this final stop position, the stop means being advantageously distinct from the anti-unscrewing means, the stop means comprising a stop wall (147) against which a pin of stop (27) formed by the ring (2) comes into abutment in final screwing position.

10. A fluid dispenser according to claims 8 and 9, wherein the neck (14) comprises a substantially cylindrical barrel (141) on which is formed the external thread (142), this being surrounded at its base by a crown (143), the housing (145; 145 '; 145 "), the access ramp (148) and preferably the stop abutment wall (147) being formed by this ring (143).

11. A fluid dispenser according to claim 6 or 7, wherein the stud (26; 26 '; 26 ") is axially displaceable along the X axis.

12.- fluid dispenser according to claim 6 or 7, wherein the stud (26 '") is movable radially relative to the axis X.

13. Fluid dispenser according to any one of the preceding claims, wherein the dispenser member further comprises a pump (3) or a valve mounted on the mounting ring (2) to be screwed.

14.- fluid dispenser according to any one of the preceding claims, wherein the anti-unscrewing means (146, 26) are at least partially destructible in case of forced unscrewing, thereby giving the user a visual indication of the first use.