WO2005063402A1

WO2005063402A1 - Fluid product dispensing member

Info

Publication number: WO2005063402A1
Application number: PCT/FR2004/050737
Authority: WO
Inventors: Firmin Garcia
Original assignee: Valois Sas
Priority date: 2003-12-22
Filing date: 2004-12-20
Publication date: 2005-07-14
Also published as: CN1913971A; JP2007515288A; BRPI0417954A; DE602004026636D1; EP1703986A1; FR2864046A1; CN100509173C; ES2342470T3; EP1703986B1; FR2864046B1

Abstract

The invention relates to a fluid product dispensing member (100; 200; 300; 400) comprising a dispensing wall (123; 223; 323; 423) defining an outer surface and an inner surface, said wall being traversed by a dispensing port (125; 225; 325; 425) which connects the inner surface to the outer surface. The inner surface forms a sealed sliding barrel for a piston (131, 132, 133; 231, 232, 233; 331, 332, 333; 431, 432, 433) which can move in sealed contact inside said barrel in order selectively to uncover the dispensing port. Moreover, the piston forms a wall element of a fluid product chamber (1) in which the fluid product is selectively pressurised. In addition, the inner surface forms a fluid product whirling system (126; 226; 326; 426), at the sliding barrel, immediately upstream of the dispensing port. The invention is characterised in that the dispensing wall is formed by an essentially-cylindrical skirt (122; 222; 322; 422) which also comprises a guide wall (124; 224; 324; 424), said guide wall defining an inner surface having an inner diameter that is greater than that of the sliding barrel.

Description

Fluid product distribution member

The present invention relates to a fluid product dispensing member generally intended to be associated with a fluid product reservoir to together constitute a fluid product dispenser, π is a dispensing member whose actuation is generally carried out manually at using a user's finger. The fluid product is distributed in the form of a jet of fine spray droplets, a continuous stream or even a dab of fluid product, particularly in the case of viscous products, such as cosmetic creams. Such a distribution organ of. fluid product can in particular be used in the fields of perfumery, cosmetics or even pharmacy to distribute more or less viscous products. The present invention relates more particularly, but not exclusively, to a type of dispensing member which is commonly designated by the term "push-pump". This designation is explained by the fact that the dispensing member comprises a pusher not only forming a dispensing orifice but further defining a part of a fluid chamber in which the fluid is selectively pressurized. In the case of a pump, it is a pump chamber. A peculiarity of this push-button pump lies in the fact that an internal surface of the push-button, of generally substantially cylindrical shape, serves as a sealing casing for a piston which moves in sealed contact in this barrel to thus selectively unmask the orifice of distribution. This piston is generally a piston of the differential type which moves in response to a change in pressure of the fluid inside the chamber. This differential piston is to be distinguished from the main piston, the displacement of which is generated by the actuation of the pusher. Thus, in such a push-up pump, there is a differential piston and a main piston, displaceable in sealed contact in respective drums. The main barrel for the main piston can also be formed by the pusher. This is notably the case in the pump described in document WO 97/23304. The pusher comprises a bearing wall on which pressure is exerted using a finger to actuate the pusher. In addition, the pusher comprises a skirt which extends downwards from the support wall. This skirt forms a first sealed sliding was for a differential piston and a second was main for the main piston of the pump. The differential piston is dissociated from the main piston. The differential piston is biased away from the support wall by a spring which serves both as a return spring and as a precompression spring. The sliding barrel of the differential piston is formed with an outlet duct which leads to an attached nozzle in a housing formed in the skirt of the pusher. This nozzle forms a dispensing orifice at the level of which the fluid product leaves the dispensing member. In addition, the housing formed by the skirt is produced with a swirl system which cooperates with the nozzle to drive the fluid product in a swirl movement before exiting through the dispensing orifice. This swirl system is conventionally constituted by one or more tangential swirl channels opening into a swirl chamber precisely centered on the dispensing orifice. The swirl system is in the form of a recess network inside the housing of the skirt. This recess network is then completed by the attached nozzle which isolates the swirl channels as well as the chamber. Thus, the casing for coating the differential piston is in the form of a cylindrical surface only interrupted at the level of the outlet channel. When the pusher is pressed, the main piston rises in the main ft of the pusher, which has the effect of displacing the differential piston by sealed sliding inside the differential barrel. This has the effect of compressing the spring: the differential piston then moves upwards towards the support wall of the pusher. The active sealing lip of the differential piston, which is in direct contact with the fluid, slides in the lower part of the barrel located under the outlet channel. As soon as the differential piston reaches the level of the outlet duct, the fluid product pressurized in the chamber is forced out of the chamber through this conduit and reaches the nozzle where it is swirled and ejected through the dispensing orifice. The pump of document WO 97/23304 consists of five essential constituent elements, namely a body intended to be associated with a reservoir of fluid product, the pusher, a ball forming an inlet valve, the differential piston and the nozzle. The body forms the main piston. Document US-4050613 discloses a pump comprising a pusher and a differential piston which slides inside the pusher. The internal wall of the pusher thus forms a sleeping barrel. This barrel is provided with a swirl system which forms a recess in the internal wall of the pusher. By sliding in the barrel, the differential piston unmasks the swirl system. The barrel is perfectly cylindrical over its entire height and therefore has a constant diameter. The molding of the swirl system is therefore complicated, since it is necessary to remove the pin which forms the swirl system without damaging the barrel. An object of the present invention is to remedy this problem of molding the swirl system. To achieve this object, the present invention provides a fluid dispenser member having the characteristics of claim 1. This type of dispenser member can be a pump of the push-pump type, but it can also be a other types of distribution members in which the pusher is dissociated from the distribution wall. One can in particular imagine that the distribution wall is fixed relative to the reservoir, or even movable relative to the pusher. Advantageously, the sliding barrel, the dispensing orifice and the swirl system are formed integrally by the dispensing wall. This characteristic is particularly advantageous as regards the molding of the distribution wall. In fact, the distribution wall is very generally made from molded injected plastic. For this, we use a mold made up of several elements. One of these elements forms in particular a pin intended to form the internal surface of the distribution wall. In the case of the present invention, this spindle must form not only the casing, but also the swirl system. Since the swirl system expands to form a recessed part in the casing, the spindle must form a corresponding imprint which projects outwards. Thus, during the withdrawal of the spindle during demolding, the protruding impression must be forcibly removed the protruding impression must therefore leave the hollowed-out part only to form it and move over an axial extent of the barrel. sliding since the plastic is flowable, the forceful passage of the protruding imprint marks very little the sliding barrel. Also, by providing a guide wall with an internal surface having a diameter greater than that of the sliding barrel, the projecting imprint of the spindle can be removed at this level without biting into the internal surface of the guide wall. As a result, the protruding impression of the spindle is only forcefully removed over a small axial extent of the casing: this limits the risk of deterioration of the casing during demoulding of the spindle. On the other hand, the fact that the guide wall has: an internal diameter greater than that of the casing of casing also allows easier installation of the differential piston in the barrel without having to rub at the level of the wall guide. According to another embodiment, the distribution wall is formed by a pusher further comprising a bearing wall which is extended on its external periphery by the distribution wall. Advantageously, the piston is urged elastically against the support wall and is movable away from this support wall to unmask the dispensing orifice. This characteristic is also advantageous in combination with a guide wall whose internal diameter is greater than that of the sliding barrel. Indeed, if the piston moves in the upper part of the casing adjacent to the support wall, it avoids the lower part of the barrel which can possibly be damaged by the removal of the projecting imprint of the spindle which formed the swirl system. According to another characteristic, the piston is resiliently biased away from the guide wall and is movable towards this guide wall. In this case, the piston must move on the lower part of the casing which may possibly be damaged by the protruding imprint of the molding pin. In other aspects, the piston is resiliently biased away from the support wall and is movable towards this support wall. Again, the piston moves on the part of the barrel which has been crossed by the projecting imprint of the molding spindle. According to another advantageous characteristic, the support wall comprises an internal surface which forms a wall element of the chamber. This is particularly the case when the piston moves away from the bearing wall against a return spring. According to another aspect, the piston is a differential piston which moves in response to a variation in pressure in the chamber, said differential piston comprising at least one sealing lip in tight sealing contact with the sealing barrel. Advantageously, the differential piston is secondary to a main piston in tight sealing contact in a main barrel.

This is particularly the case in a pump of the pump-cap type. According to another aspect, the dispensing member comprises a body intended to be associated with a fluid reservoir, said body forming a main barrel in which a main piston slides. According to another practical aspect, the distribution wall is formed by a substantially cylindrical skirt which further forms a guide wall defining an internal surface forming a main barrel for a main piston. Advantageously, the swirl system comprises at least one swirl channel and a swirl chamber centered on the dispensing orifice and optionally a feed ring. peripheral. This is a classic design for a swirl system. An interesting aspect of the invention resides in the fact that the same wall traversed by a dispensing orifice internally forms a swirl system of fluid product. Advantageously, the internal surface forms a casing for an advantageously differential piston. The invention will now be described more fully with reference to the drawings giving by way of nonlimiting examples several embodiments of the invention. In the figures: - Figure 1 is a vertical cross-sectional view through a dispensing member according to a first embodiment in the idle state and associated with a fluid reservoir shown only partially, - Figure 2 is a view similar to FIG. 1 in the actuated position, FIGS. 3a and 3b are schematic views of the internal surface of the distribution wall formed with a swirl system

-e according to the invention, respectively in the rest position and actuated, - Figures 4a and 4b are views in vertical cross section through distribution members according to two alternative embodiments, - Figure 5 is a cross sectional view vertical sώiilaire to that of Figures 1 and 2 for another embodiment of the invention in the rest position, - Figure 6 is a view similar to Figure 5 in the actuated position, and - Figure 7 is a sectional view vertical transverse through a distribution member according to yet another embodiment of the invention in the rest position.

The dispensing member of the first embodiment of Figures 1 and 2 is shown associated with a container 150 comprising a body 151 internally defining a fluid reservoir 5. The body 151 is provided with its upper end of an opening in the form of a neck 153, which is used for fixing the dispensing member of the invention. The dispensing member comprises three constituent elements, namely a body 110, a pusher 120 and a piston member 130. The dispensing member further comprises spring means in the form of a coil spring

140. The body, the pusher and the piston member are preferably made by molding plastic material. The dispensing member has the design of a pump comprising a pump chamber 1. The body 110 comprises a fixing ring 111 which cooperates with the neck 153 for fixing the member to the container 150. The ring 111 is in engagement with the outside of the neck 153. On the other hand, the body forms a self-sealing lip 112 in leaktight engagement with the internal wall of the neck 153. The body 111 also forms a guide sleeve 114 which can advantageously extend in the extension of the ring 111. The upper end of the guide sleeve 114 is formed with a re-entrant flap 1141. The body 110 also forms a crown 113 which extends concentrically inside the guide sleeve 114 Thus, an annular is formed between the sleeve 114 and the crown 113. The crown 113 forms at its upper end a shoulder 1131 which will serve as a bearing surface for the spring 140. The crown 113 extends upward forming a barrel main 117 which internally defines a sealed sleeping surface, the function of which will be given below. The body also forms a dip tube 115 which extends inside the container 150. The dip tube 115 is extended at its upper end by an inlet sleeve 116 which forms an inlet valve profile or seat 1161. The dip tube 115 and the sleeve 116 are crossed by an inlet conduit

118. The inlet sleeve 116 extends concentrically inside the main barrel 117, so that an annular space is formed between them. The body 110 has an axial symmetry of revolution about an axis X which extends longitudinally to the axial center of the inlet duct 118. This is a particular design for a particular body of an organ distribution according to a first embodiment of the invention. Of course, the body can have other characteristics than those which have just been described, without however departing from the scope of the invention. The pusher 120 forms a dispensing head of the dispensing member. The pusher 120 comprises a support wall 121 and a peripheral skirt 122 which extends downwards from the external periphery of the support wall. Thus, the pusher 120 has a general shape of an inverted bucket, the support wall of which forms the bottom and the skirt the cylindrical side wall. However, the skirt is not necessarily cylindrical in shape. It can have tapered or rounded sections. The support wall 121 includes an external support surface 1211 which can be pressed using one or more finger (s). On the other hand, the bearing wall 121 comprises an internal surface 1212 which advantageously forms an abutment stud 1213. The skirt 122 comprises an upper distribution wall 123 and a lower guide wall 124. The distribution wall 123 is connected at its upper end at the external periphery of the support wall 121. The distribution wall 123 comprises an external surface 1221 and an internal surface 1232. This internal surface 1232 is preferably circular cylindrical and defines a sliding shaft as is will see below. On the other hand, the distribution wall 123 is formed with a through distribution orifice 125 which extends from the internal surface to the external surface. The distribution orifice 125 can open at the external surface in a diffusion cup 1251. According to an advantageous characteristic of the invention, the internal wall 1232 of the distribution wall 123 is formed with a swirl system 126 which allows to cause fluid to rotate in the form of a swirl whose eye is centered on the dispensing orifice. Thus, the distribution wall 123, which is advantageously produced in a single piece with the support wall 121 and the guide wall 124, is traversed by a distribution orifice and comprises an internal surface formed with a swirl system. The guide wall 124 comprises a stop bead 141 on its external surface intended to cooperate with the re-entrant flap 1141 of the guide bush 114. The guide wall 124 is disposed in the annular formed between the guide bush 114 and the crown 113. The abutment cord 1241 makes it possible to secure the pusher to the body, which can thus only move axially over a maximum stroke determined by the distance separating the lower end of the guide wall 124 and the bottom of the ring finger formed between the sleeve 114 and the crown 113. The piston member 130 comprises, in this embodiment, a main piston 136 engaged in sealed sliding in the main barrel 117 and a differential piston formed by two lips 132 and 133 in sliding contact sealed in the barrel formed by the internal surface 1232 of the distribution wall 123. The piston member 130 is advantageously produced in a single piece. The lips 132 and 133 extend one above the other with a spacing greater than the axial extent of the swirl system 126. In the rest position shown in FIG. 1, the upper lip 132 is in contact of the internal surface 1232 above the swirl system 126, while the lower lip 133 comes in. contact of the internal surface 1232 below the swirl system 126. Thus, the swirl system cannot communicate with the interior of the pusher except at the level of the space formed between the two lips 132 and 133. This is the rest position in which the piston member 130 is biased against the bearing wall 121 by the spring 140, which bears on the one hand on the shoulder 1131 and on the other hand under a plate 131 formed by the member piston 130. Moreover, the two lips 132 and 133 are formed on the outer periphery of the plate 131. In its center, the plate abuts against the abutment pad 1213 formed at the level of the internal surface 1212 of the wall d 'support 121. We can consider that the differential piston is formed by the plate 131 forming the two lips 132 and 133. The piston member 130 also forms an axial central rod 137 which extends from the plate 131 away from the support wall 121. This axial rod

137 is partially engaged inside the inlet sleeve 116 formed by the body 110. The rod 137 forms a valve profile 138 intended to cooperate with the corresponding profile 1161 formed by the sleeve 116. In other words, the rod 137 in cooperation with the sleeve 116 forms an inlet valve for a chamber pump 1, as will be seen below. On the other hand, the piston member 130 forms a piston crown 135 at the lower end of which the main piston 136 is formed. The piston crown 135 extends concentrically around the axial rod 137, so as to define between them an annular duct which extends through the plate 131 through fluid passage holes 134. The body 110, the pusher 120 and the piston member 130 together form a pump chamber 1 which s extends continuously between the main barrel 117 and the sleeve 116, between the piston crown 135 and the axial rod 137, in the through holes 134, and between the plate 131 and the internal surface 1212 of the bearing wall 121 Thus, the upper surface of the plate 131 and the internal surface 1212 form wall elements of the pump chamber 1. In the rest position shown in FIG. 1, the spring 140 pushes the piston member 130 into abutment against the support wall 121. The inlet valve formed in cooperation between the axial rod 137 and the sleeve 116 is open ω The two lifts 132 and 133 of the differential piston are in contact with the barrel formed by the internal surface 1232 of the actuating wall 123 as shown in dotted lines on Figure 3a. By exerting a force on the external support surface 1211 of the support wall 121, the pusher moves axially relative to the body 110. Since the piston member is in abutment against the support wall, the he piston member is pushed by the pusher. Initially, the movement of the pusher has the effect of closing the inlet valve: the axial rod 137 engages more deeply in the sleeve 116 until a sliding sealed contact is created between the sleeve or the rod. Thus, the pump chamber 1 is isolated from the reservoir 5. From this moment, the product in the pump chamber 1 will be pressurized. Because the fluid product is incompressible, the total useful volume of the pump chamber remains necessarily constant. But as the main piston 136 sinks into the barrel 117 thus reducing the volume of the lower part of the chamber, a new volume must be created. This is possible because the differential stud moves away from the bearing wall 121. This has the effect of sliding the lips 132 and 133 inside the distribution wall 123. The lips thus move up 'that the upper lip 132 arrives at the swirl system 126. This is shown in Figure 2. At this time, the fluid under pressure in the pump chamber finds an outlet passage through the swirl system and the dispensing orifice. The position of the upper lip 132 is shown in dotted lines in FIG. 3b. The passage thus remains open as long as the pressure inside the chamber can overcome the force of the spring 140. As soon as the pressure decreases below a certain threshold inside the chamber, the spring 140 pushes the piston differential to the rest position shown in Figure 3a. The swirl system and the dispensing orifice are then again isolated from the pump chamber. It may be noted that the upper lip 132 is directly in contact with the fluid, while the lower lip is not directly in contact with the fluid. Thus, the upper lip slides in the upper part of the barrel defined between the support wall and the swirl system. However, this part of the barrel has a better surface quality than the lower part which extends below the swirl system, which can be damaged by the withdrawal of the molding spindle. Figures 3a and 3b show a particular non-limiting embodiment for the swirl system formed in the distribution wall of the distribution member of the invention. This swirl system includes at least one tangential swirl channel 1262. In the figures, there are three tangential channels arranged equiangularly. On the other hand, the swirl system also includes a central swirl chamber 1261 which is precisely centered with respect to the dispensing orifice 125. Optionally, the swirl system can include a peripheral feed ring 163 which allows feeding all the swirl channels 1262. If necessary, the swirl system can be reduced to a single swirl channel associated with the central swirl chamber. An advantageous characteristic of the invention resides in the fact that the piston member 140 is biased against the bearing wall 121 and moves under the effect of the pressure increase inside the pump chamber in distance from this support wall. This is in particular made possible by the fluid passage holes 134 which pass through the plate 131 forming the differential piston. It can also be said that the support wall defines a wall element of the pump chamber. Such a displacement of the differential piston away from the support wall, in association with a swirl system formed in the distribution wall, is advantageous in terms of demolding since the upper lip 132 slides in leaktight manner on the part upper part of the casing which cannot be damaged by the removal of the molding pin forming the negative imprint which was used to mold the swirl system. _' ^• se It can also be noted that the rest position is reached when the stop bead 1241 formed by the guide wall 124 is in support under the re-entrant flap 1141. On the other hand, the axial guidance of the pusher is ensured, d on the one hand by the axial guide of the guide wall 124 between the sleeve 114 and the crown 113, and on the other hand by the engagement of the piston crown 135 and the axial rod 137 respectively in the main barrel 117 and the inlet sleeve 116. Figures 4a and 4b show two alternative embodiments of the embodiment of Figures 1 and 2. In the variant of Figure 4a, the return and precompression spring is formed integrally by the body 210 and bears the reference numeral 2171. The spring extends in the extension of the main barrel 217 and comes to bear under the plate 231 which forms the differential piston with its two lips 232 and 233. The spring 2171 thus extends concentrically autou r of the crown 230 which forms the main piston 236. Apart from the return spring, the distribution member 200 of FIG. 4a can be identical to that of FIGS. 1 and 2. In the embodiment 4b, the distribution member 300 comprises a return spring 3311 which is produced in a single piece by the piston member

330. More specifically, the spring 3311 extends from the underside of the plate 331. It comes to bear at its lower end on the shoulder 3331 formed by the body 310. Apart from the particular shape of the spring, the member dispensing device 300 may be identical to that of FIGS. 1 and 2. In these variant embodiments of FIGS. 4a and 4b, the dispensing member comprises only three constituent elements, namely a body, a pusher and a piston member, the return and precompression spring being integrated either in the body or in the piston member. The embodiment of the dispensing member according to the invention shown in Figures 5 and 6 is shown in association with a container 450 defining an opening in the form of a neck 453 which advantageously has at its external surface a fixing profile. The container 450 internally defines a fluid reservoir 5. The dispensing member referenced as a whole by the reference numeral 400 comprises three constituent elements, namely a body 410, a pusher 420 and a piston member 430. These three parts can be made by injection / molding of plastic material. The body 410 comprises a fixing ring 411 cooperating with the neck 453 of the container 450. More specifically, the ring 411 engages around the neck 453. The body 410 may also include a self-sealing lip 412 in sealing contact with the wall internal of the neck 453. A guide douiUe 414 can extend in the extension of the fixing ring 411. The ring 414 comprises at its upper end a re-entrant flap 4141 whose function will be given below. The body 410 also comprises a ring 413 which extends concentrically inside the guide sleeve

414. Thus, U is created an annular space between the sleeve 414 and the crown 413. The upper end of the crown 413 forms a main piston 4133 in the form of a sealing lip. The body 410 also comprises an inlet sleeve 416 which extends concentrically inside the crown 413. The upper end of the sleeve 416 forms a profile or valve seat 4161. On the other hand, the body 410 integrally forms a dip tube

415 which extends into the container 450. The dip tube internally defines an inlet conduit 418 which extends into the inlet sleeve 416. The pusher 420 comprises a bearing wall 421 as well as a peripheral skirt 422. The skirt 422 is connected to the support wall 420 at its outer periphery. The support wall 421 comprises an external support surface 4211 as well as an internal surface 4212. The support wall 421 and the skirt 422 have a general shape of a bucket turned upside down with the bottom of the bucket formed by the wall of support 421 and the cylindrical side wall formed by the skirt 422. The support wall 421 comprises spring means in the form of legs or elastically deformable blades 427 which extend from the internal surface 4212. Other apart, the support wall 421 comprises a retaining member 428 which also extends from the internal surface 4212. The retaining member -428 comprises at least one retaining profile 4281 having a retaining edge oriented towards the internal surface 4212. In practice, the retaining member can comprise several retaining profiles formed outside of a spinner which extends downwards from the support wall 421. The skirt 422 comprises a wall 423 distribution and a mistletoe wall 424 distribution wall 423 is rehée by its upper end to the outer periphery of the support wall 421. The guide wall 424 is connected by its upper end to the lower end of the distribution wall 423. The wall distribution 423 comprises an external surface as well as an internal surface 4232. The internal surface is at least partially cylindrical so as to constitute a sealed casing. The internal wall 4232 is advantageously formed with a swirl system 426 which forms a hollow network in the cylindrical surface 4232. This swirl system may include one or more swirl channels as well as a swirl chamber. On the other hand, the distribution wall 423 is formed with a distribution orifice which passes through the wall so as to extend from the internal surface to the external surface. The dispensing orifice 425 is centered relative to the swirl system 426. The swirl system can be identical to that shown in FIGS. 3a and 3b. The guide wall 424 is engaged in the annular space formed between the guide sleeve 414 and the crown 413. The guide wall forms a shoulder 4241 intended to come into abutment under the re-entrant flap 4141 of the sleeve 414. Advantageously, the internal surface 4242 of the guide wall 424 forms a main barrel in which the main piston 4133 is movable in sealed contact. The guide wall 424 is biased by a spring 440 which pushes the shoulder 4241 against the re-entrant flap 4141. The spring 440 can advantageously be produced in a single piece by the pusher in the extension of the guide wall 424. Thus, the piston main 4133 can slide inside the pusher, or more precisely inside the guide wall 424 which internally forms the main barrel 4242. The piston member 430 here forms a differential piston associated with a movable valve member input. The piston member 430 comprises a plate 431 which forms at its external periphery two sealing lips 432 and 433. The plate 431 and its two lips together form the differential piston. In the rest position shown in Figure 5, the upper lip 432 is positioned above the swirl system, while the lower lip 433 is positioned below the swirl system. Thus, the swirl system cannot communicate with the interior of the pusher. On the other hand, the plate 431 forms an annular housing 4311 intended to receive the free ends of the elastically deformable tabs 427 formed by the support wall 421. In addition, the piston member 430 forms a hooking element 439 which extends from the plate 431 in the direction of the support wall 421. This hooking element 439 comprises hooking heads

4392 located at the end of legs 4391. The 4392 hanging heads are in taken between the internal wall 4212 and the retaining profiles 4281 formed by the retaining member 428. Thus, the heads can move over a limited stroke between the retaining profiles and the internal surface of the support wall. However, the elastically deformable tabs 427 solicit the piston member 430 away from the support wall 421, so that the hooking heads 4392 are pushed into engagement with the retaining profiles 4281. The hooking heads 4392 can come into contact against the internal surface 4212 by bending the elastically deformable tabs 427. ϋ thus exist means for limiting the stroke constituted by the cooperation of the retaining member with the latching element. The piston member 430 is thus trapped inside the pusher while being able to move axially over a limited stroke. The elastically deformable tabs 427 solhcitate however the piston member in the rest position, in laqueUe the latching heads are engaged with the retaining profiles. In addition, the sealing lips 432 and 433 are positioned on either side of the swirl system so as to isolate it. This corresponds to the rest position shown in Figure 5. On the other hand, the piston member 430 also forms an axial center rod 437 which has at its lower end an inlet valve profile 438 which cooperates with the profile corresponding 4161 of the sleeve 416 to form together the inlet valve. In the rest position, the inlet valve is open. Thus, a pump chamber 1 is created between the body of the pusher and the piston member. The pump chamber 1 is isolated from the outside by the lower lip 433 but, however, communicates with the reservoir through the open inlet valve. From the rest position in FIG. 5, pressure can be exerted on the external support surface 4211 of the support wall 421. This has the effect of displacing the pusher and the piston member relative to the body. Initially, the inlet valve will be closed because the axial rod 437 penetrates deeper into the sleeve 416 so as to create a contact waterproof sliding. From this moment, the pump chamber 1 is isolated from the outside. The fluid in the pump chamber is then subjected to an increase in pressure, which has the effect of displacing the piston member 430 in the direction of the support wall 421, against the spring force exerted by the elastic tabs 427. Thus, the lower lip 433 will move upwards until it reaches the level of the swirl system 426. From this moment, the fluid product finds an outlet passage through the swirl system and the dispensing orifice. This actuating position is shown in FIG. 6. To reach this position, the pressure inside the pump chamber must be greater than the stiffness of the elastically deformable tabs 427, which consequently act as a spring. precompression. The piston member 430 can move in the direction of the support wall 421 until the hooking heads 4392 come into abutment against the internal surface 4212. In this position, which is that of FIG. 6, the lower sealing lip 433 of the differential piston is positioned at the level of the swirl system. As soon as the pressure inside the chamber decreases again, the piston member 430 can move away again from the bearing wall 421 under the action of the elastic tabs 427. The piston member 430 returns finally in its rest position shown in Figure 5. The piston member 430 is trapped in the pusher while leaving it limited freedom of axial movement. It should also be noted that the precompression spring is formed integrally by the pusher. On the other hand, the captivity of the piston member and its limited movement are entirely ensured by the pusher and the piston member, without additional part. In the embodiment shown in FIG. 7, the dispensing member comprises a body 510, a pusher 520, a piston member 530 and a fixing ring 570. The dispensing member is mounted on a container 550 forming internally a reservoir 5 and comprising an opening in the form of a neck 553 devoid of fixing profiles. A difference with the embodiments of the previous figures lies in the fact that the body no longer performs the fixing on the opening of the tank. On the contrary, in this embodiment, the body 510 is engaged in a fixing ring 570 which makes the sealed connection on the tank opening. As such, the fixing ring 570 comprises a self-sealing lip 572 engaged by force in a sealed manner inside the opening 553 of the container 550. The ring 570 comprises a support flange 571 bearing on the upper end of the opening 553. In addition, the body forms a re-entrant flange 575 which delimits a passage opening for the plunger tube 515 of the body 510. The ring 570 also includes a crown 573 which internally defines a housing for the body 510. The crown 573 is extended at its upper end by a guide sleeve 574. On the other hand, the ring

570 also forms a return and precompression spring 576 which extends in a single piece from the crown 573 concentrically inside the guide bush 574. The guide bush 574 also forms on its outer surface a abutment profile 5741 which cooperates with the pusher 520. The body 510 is engaged inside the ring 570, or more precisely inside the crown 573 coming into abutment on the re-entrant flange 575. Just as in- the other previous embodiments, the body 510 forms <> a casing 517, a dip tube 515, an inlet sleeve 516. The advantage of making the body and the ring in two separate distinct parts lies in the fact that it is possible to use different materials for the body and the ring. This is particularly justified by the fact that the ring is often a decorative element while the body is a functional element. If, for example, the ring is to be made of colored plastic, this should not be the case with the dip tube which is very often visible through the container. On the other hand, it is more fadle to produce the spring 576 with the ring 570 when the body is produced separately. The piston member 530 may be strictly identical to that of the preceding embodiments of FIGS. 1 to 4. It may however be noted that the piston member 530 is produced with a guide rib 5351 intended to slide in leaktight manner around of sleeve 516. As in the embodiments of Figures 1 to 4, the piston member forms a differential piston and a main piston. The differential piston slides in the pusher 520 while the main piston slides in the sleeve 517. The piston member 530 is intended to move away from the bearing wall of the pusher when the pressure increases. This has the effect of unmasking a spray orifice 525 advantageously equipped with a swirl system 526 which is produced in the internal surface of the guide wall 523. It may also be noted that the lower end of the pusher comes into abutment engagement against the stop profile 5741. The external diameter of the pusher is substantially identical to that of the container. In this way, the fixing ring 570 is only very visible.

Claims

claims

1.- Fluid product distribution member (100; 200; 300; 400) comprising a distribution wall (123; 223; 323; 423) defining an external surface and an internal surface, said wall being traversed by a distribution orifice (125; 225; 325; 425) connecting the internal surface to the external surface, the internal surface forming a sealed sliding barrel for a piston (131, 132, 133; 231, 232, 233; 331, 332, 333; 431 , 432,

433) capable of moving in sealed contact in said barrel to selectively unmask the dispensing orifice, said piston forming a wall element of a fluid product chamber (1) in which the fluid product is selectively pressurized, the internal surface, at the level of the casing, form a swirl system of fluid product

(126; 226; 326; 426) immediately upstream of the dispensing orifice, characterized in that the dispensing wall is formed by a substantially cylindrical skirt (122; 222; 322; 422) further comprising a guide wall (124; 224; 324; 424) defining an internal surface whose internal diameter is greater than that of the casing. 2. A fluid dispenser member according to claim 1, in which the casing, the dispensing orifice and the swirl system are formed integrally by the dispensing wall. 3.- fluid dispenser member according to any one of the preceding claims, wherein the dispensing wall is formed by a pusher (120; 220; 320; 420) further comprising a bearing wall (121; 221 ; 321; 421) which extends on its outer periphery by the distribution wall. 4. A fluid dispenser member according to claim 3, in which the piston is resiliently moved against the support wall and can be moved away from this support wall to unmask the dispensing orifice.

5. A fluid dispenser member according to claim 2, in which the piston is resiliently moved away from the guide wall and is movable towards this guide wall. 6. A fluid dispenser member according to claim 3, in which the piston is elastically moved away from the support wall and is movable towards this support wall. 7. A fluid dispenser member according to claim 4 or 5, wherein the support wall comprises an internal surface (1212; 2212; 3212) which forms a wall element of the chamber. 8. A fluid dispenser member according to any one of the preceding claims, in which the piston is a differential piston which moves in response to a pressure variation in the chamber, said differential piston comprising at least one lip. tightness (132, 133; 232, 233; 332, 333; 432, 433) in tight sliding contact with the bedding ft. 9. A fluid dispenser member according to claim 8, wherein the differential piston is integral with a main piston (136; 236; 336) in tight sliding contact in a main barrel. 10.- fluid dispenser member according to any one of the preceding claims, comprising a body (110; 210; 310) intended to be associated with a fluid reservoir, said body forming a main barrel in which slides a piston main. 11. A fluid dispenser member according to any one of the preceding claims, in which the dispensing wall is formed by a substantially cylindrical skirt (422) which further forms a guide wall (424) defining an internal surface forming a main barrel for a main piston. 12.- fluid dispenser member according to any one of the preceding claims, wherein the swirl system comprises at least one swirl channel (1262) and a chamber (1261) swirl centered on the dispensing orifice and optionally a peripheral feed ring (1263). 13. A fluid dispenser member according to any one of the preceding claims, in which the swirl system forms a hollowed out network with respect to the substantially cylindrical internal surface of the distribution wall.