EP1703986B1 - Fluid product dispensing member - Google Patents

Description

The present invention relates to a fluid dispenser member generally intended to be associated with a fluid reservoir to form together a fluid dispenser. It is a dispensing member whose actuation is usually performed manually using a finger of the user. The fluid product is distributed in the form of a jet of fine sprayed droplets, a continuous net or a dab of fluid, particularly in the case of viscous product, such as cosmetic creams. Such a fluid dispenser member may in particular be used in the fields of perfumery, cosmetics or even pharmacy to dispense more or less viscous products.

The present invention is more particularly, but not exclusively, concerned with a type of dispensing member which is commonly referred to as a "push-pump". Such a designation is explained by the fact that the dispensing member comprises a pusher forming not only a dispensing orifice but also defining a portion of a fluid product chamber in which fluid is selectively pressurized. In the case of a pump, it is a pump chamber. A peculiarity of this pusher pump lies in the fact that an inner surface of the pusher, of generally cylindrical general shape, serves as a sealed sliding shaft 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 that moves in response to a pressure variation of the fluid within the chamber. This differential piston is to be differentiated from the main piston whose displacement is generated by the actuation of the pusher. Thus, in such a pusher pump, there is a differential piston and a main piston, movable in sealing contact in respective drums. The main drum for the main piston can also be formed by the pusher.

This is particularly the case in the pump described in the document WO 97/23304 . The pusher comprises a bearing wall on which is exerted a pressure with a finger to actuate the pusher. In addition, the pusher comprises a skirt that extends downwardly from the support wall. This skirt forms a first sealed sliding shaft for a differential piston and a second main shaft 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 acts as both a return spring and a precompression spring. The sliding piston of the differential piston is formed with an outlet conduit which leads to a nozzle attached in a housing formed in the skirt of the pusher. This nozzle forms a dispensing orifice at which the fluid product exits the dispensing member. In addition, the housing formed by the skirt is made with a swirl system that cooperates with the nozzle to drive the fluid in a swirling motion before exiting through the dispensing orifice. This vortex system is conventionally formed by one or more tangential swirl channels opening into a vortex chamber centered precisely on the dispensing orifice. The swirl system is in the form of a recess network within the skirt housing. This recess network is then supplemented by the attached nozzle which isolates the swirl channels and the chamber. Thus, the sliding shaft of the differential piston is in the form of a cylindrical surface only interrupted at the channel so. When pressing the pusher, the main piston back in the main shaft of the pusher which has the effect of moving the differential piston by sealingly sliding inside the differential drum. This has the effect of compressing the spring: the differential piston then moves upwards towards the bearing wall of the pusher. The active sealing lip of the differential piston, which is directly in contact with the fluid product, 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 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 the document WO 97/23304 consists of five essential components, namely a body intended to be associated with a fluid reservoir, the pusher, a ball forming an inlet valve, the differential piston and the nozzle. The body forms the main piston.

Document is known US-4,050,613 a pump comprising a pusher and a differential piston which slides inside the pusher. The inner wall of the pusher thus forms a sliding shaft. This barrel is provided with a swirl system which forms a recess in the inner wall of the pusher. 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 because it is necessary to remove the spindle which forms the swirl system without damaging the barrel.

An object of the present invention is to overcome this molding problem of the swirl system.

To achieve this object, the present invention provides a fluid dispenser member having the features of claim 1.

This type of dispensing member may be a pump-type push-button, but it may also be other types of dispensing members in which the pusher is dissociated from the distribution wall. One can imagine that the distribution wall is fixed relative to the reservoir, or mobile relative to the pusher. Advantageously, the sliding shaft, the dispensing orifice and the swirling system are integrally formed by the distribution wall.

This characteristic is particularly advantageous as regards the molding of the distribution wall. Indeed, the distribution wall is very generally made from molded injected plastic material. For this purpose, a mold consisting of several elements is used. One of these elements forms in particular a pin for forming the inner surface of the distribution wall. In the case of the present invention, this pin must form not only the sliding shaft, but also the swirl system. Since the swirl system extends into a recessed portion in the slide shaft, the pin must form a corresponding recess protruding outwardly. Thus, during removal of the spindle during demolding, the protruding impression must be removed in force, the protruding imprint must therefore come out of the recessed portion until it is formed and move over an axial extent of the spout. sliding as the plastic is flowable, the passage of force of the protruding imprint marks very little sliding shaft. Also, by providing a guide wall with an inner surface having a diameter greater than that of the slide shaft, the projecting indentation of the pin can be removed at this level without biting into the inner surface of the guide wall. As a result, the projecting indentation of the spindle is only forcibly withdrawn over a small axial extent of the sliding barrel: this limits the risk of deterioration of the sliding barrel during demolding of the spindle.

On the other hand, the fact that the guide wall has an internal diameter greater than that of the sliding shaft also makes it easier to position the differential piston in the barrel without having to rub it 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 extends on its outer periphery by the distribution wall. Advantageously, the piston is biased elastically against the support wall and is movable away from the support wall to unmask the dispensing orifice. This feature is also advantageous in combination with a guide wall whose inner diameter is greater than that of the sliding shaft. Indeed, if the piston moves in the upper part of the sliding shaft adjacent to the support wall, it avoids the lower part of the shaft which can possibly be deteriorated by the removal of the protruding imprint of the spindle which formed the swirl system.

According to another characteristic, the piston is urged elastically 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 sliding shaft which may possibly be damaged by the projection protruding from the molding pin.

In other aspects, the piston is biased elastically away from the support wall and is movable towards the support wall. Again, the piston moves on the portion of the barrel that has been traversed by the protruding imprint of the molding pin.

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 support wall against a return spring.

In another aspect, the piston is a differential piston that moves in response to a pressure variation in the chamber, said differential piston comprising at least one sealing lip in sealing contact with the sliding shaft. Advantageously, the differential piston is secured to a main piston in leaktight sliding contact in a main drum. This is particularly the case in a pump-type pump.

In another aspect, the dispensing member comprises a body intended to be associated with a fluid reservoir, said body forming a main drum in which slides a main piston. In another practical aspect, the distribution wall is formed by a substantially cylindrical skirt which further forms a guide wall defining an inner surface forming a main shaft 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 lies in the fact that the same wall through which a dispensing orifice passes internally forms a fluid swirling system. Advantageously, the inner surface forms a sliding shaft for an advantageously differential piston.

The invention will now be further described with reference to the drawings which give by way of non-limiting examples several embodiments of the invention.

• la figure 1 est une vue en coupe transversale verticale à travers un organe de distribution selon un premier mode de réalisation à l'état de repos et associé à un réservoir de produit fluide représenté seulement partiellement,
• la figure 2 est une vue similaire à la figure 1 en position actionnée,
• les figures 3a et 3b sont des vues schématiques de la surface interne de la paroi de distribution formée avec un système de tourbillonnement selon l'invention, respectivement en position de repos et actionnée,
• les figures 4a et 4b sont des vues en coupe transversale verticale à travers des organes de distribution selon deux variantes de réalisation,
• la figure 5 est une vue en coupe transversale verticale similaire à celle des figures 1 et 2 pour un autre mode de réalisation de l'invention en position de repos,
• la figure 6 est une vue similaire à la figure 5 en position actionnée, et
• la figure 7 est une vue en coupe transversale verticale à travers un organe de distribution selon encore un autre mode de réalisation de l'invention en position de repos.

In the figures:

• the figure 1 is a vertical cross sectional view through a dispensing member according to a first embodiment in the state of rest and associated with a fluid reservoir represented only partially,
• the figure 2 is a view similar to the figure 1 in the actuated position,
• the Figures 3a and 3b are schematic views of the internal surface of the distribution wall formed with a swirl system according to the invention, respectively in the rest position and actuated,
• the Figures 4a and 4b are views in vertical cross section through distribution members according to two embodiments,
• the figure 5 is a vertical cross-sectional view similar to that of figures 1 and 2 for another embodiment of the invention in the rest position,
• the figure 6 is a view similar to the figure 5 in the actuated position, and
• the figure 7 is a vertical cross sectional view through a dispensing member according to yet another embodiment of the invention in the rest position.

The distribution member of the first embodiment of the figures 1 and 2 is shown associated with a container 150 comprising a body 151 defining internally a fluid reservoir 5. The body 151 is provided with its upper end of an opening in the form of a neck 153, which serves to fix 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 dispenser member further comprises spring means in the form of a coil spring 140. 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 the attachment of the member to the container 150. The ring 111 is engaged with the outside of the neck 153. On the other hand, the body forms a self-engaging lip 112 in sealed engagement with the inner wall of the neck 153. The body 111 also forms a guide sleeve 114 which can extend advantageously in the extension of the ring 111. The upper end of the guide sleeve 114 is formed with a flap 1141. The body 110 also forms a ring 113 which concentrically extends inside the guide sleeve 114. Thus, an annular is formed between the sleeve 114 and the crown 113. The ring 113 forms at its upper end a shoulder 1131 which will serve as a bearing surface for the spring 140. The ring 113 extends upwardly forming a main shaft 117 which internally defines a sealed sliding surface, the function 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 plunger tube 115 and the sleeve 116 are traversed by an inlet duct 118. The inlet sleeve 116 concentrically extends 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 at the axial center of the inlet duct 118.

This is a particular design for a particular body of a dispensing member according to a first embodiment of the invention. Of course, the body may have other characteristics than those just described, without departing from the scope of the invention.

The pusher 120 forms a dispensing head of the dispenser member. The pusher 120 comprises a bearing wall 121 and a peripheral skirt 122 which extends downwardly from the outer periphery of the support wall. Thus, the pusher 120 has a general shape of inverted bucket whose bearing wall forms the bottom and the skirt the cylindrical side wall. However, the skirt is not necessarily cylindrical. It may have frustoconical or rounded sections.

The bearing wall 121 comprises an outer bearing surface 1211 on which can be pressed with one or more finger (s). On the other hand, the bearing wall 121 comprises an inner surface 1212 which advantageously forms a stop 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 to the outer periphery of the support wall 121. The distribution wall 123 comprises an outer surface. 1221 and an inner surface 1232. This inner surface 1232 is preferably circular cylindrical and defines a sliding shaft as will be seen hereinafter. On the other hand, the distribution wall 123 is formed with a through dispensing orifice 125 extending from the inner surface to the outer surface. The dispensing orifice 125 may open at the outer 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 swirling system 126 which makes it possible to drive the fluid product in rotation in the form of a swirling of which the eye is centered. on the dispensing orifice. Thus, the distribution wall 123, which is advantageously made integrally with the support wall 121 and the guide wall 124, is traversed by a dispensing orifice and comprises an inner surface formed with a swirl system.

The guide wall 124 comprises a stopper bead 141 on its outer surface intended to cooperate with the reentrant flap 1141 of the guide sleeve 114. The guide wall 124 is disposed in the annular formed between the guide bush 114 and the 113. The abutment bead 1241 makes it possible to secure the pusher to the body, which can thus only move axially on a maximum travel determined by the distance separating the lower end of the guide wall 124 from the bottom of the annulus. formed between the sleeve 114 and the crown 113.

The piston member 130 comprises, in this embodiment, a main piston 136 engaged in leaktight sliding in the main drum 117 and a differential piston formed by two lips 132 and 133 in leaktight sliding contact in the barrel formed by the surface 1232 of the partition wall 123. The piston member 130 is advantageously made in one 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. figure 1 the upper lip 132 is in contact with the inner surface 1232 above the swirl system 126, while the lower lip 133 comes into contact with the inner surface 1232 below the swirl system 126. Thus, the swirl system can not communicate with the interior of the pusher except at 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 wall of support 121 by the spring 140, which is supported on the one hand on the shoulder 1131 and on the other hand under a plate 131 formed by the piston member 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 stud 1213 formed at the inner surface 1212 of the bearing wall 121. It can be considered that the differential piston is formed by the plate 131 forming the two x 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 within 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 ring 135 at the lower end of which is formed the main piston 136. 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 extends continuously between the main shaft 117 and the sleeve 116, between the piston ring 135 and the axial rod 137, in the through holes 134, and between the plate 131 and the inner surface 1212 of the support wall 121. Thus, the upper surface of the plate 131 and the inner surface 1212 form wall elements of the pump chamber 1. In the rest position represented on the figure 1 , the spring 140 pushes the piston member 130 abutting against the support wall 121. The inlet valve formed in cooperation between the axial rod 137 and the sleeve 116 is open. The two levers 132 and 133 of the differential piston are in contact with the barrel formed by the inner surface 1232 of the actuating wall 123 as shown in dotted lines on the figure 3a .

By exerting a force on the external bearing surface 1211 of the bearing wall 121, the pusher moves axially with respect to the body 110. Since the piston member abuts against the support wall, the 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 tight contact is created between the sleeve or the rod. Thus, the pump chamber 1 is isolated from the tank 5. From this moment, the product in the pump chamber 1 will be pressurized. Since the fluid product is incompressible, the total useful volume of the pump chamber must remain constant. But like the main piston 136 sinks into the barrel 117 thus decreasing the volume of the lower part of the chamber, a new volume must be created. This is possible because the differential pin moves away from the support wall 121. This has the effect of sliding the lips 132 and 133 inside the distribution wall 123. The lips move so far. the upper lip 132 reaches the level of the swirl system 126. This is shown on the 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 on the figure 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 towards the rest position shown on the 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 product, while the lower lip is not directly in contact with the fluid product. Thus, the upper lip slides in the upper part of the barrel defined between the support wall and the swirl system. However, this portion of the barrel has a better surface quality than the lower portion which extends below the swirl system, which can be damaged by removal of the molding pin.

The Figures 3a and 3b represent a particular non-limiting embodiment for the swirl system formed in the distribution wall of the dispensing member of the invention. This swirl system comprises 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 accurately centered with respect to the dispensing orifice 125. Optionally, the swirl system may comprise a peripheral feed ring 163 which allows to supply all the vortex channels 1262. If necessary, the vortex system can be reduced to a single vortex channel associated with the central vortex chamber.

An interesting feature of the invention lies in the fact that the piston member 140 is urged against the bearing wall 121 and moves under the effect of the increase in pressure inside the pump chamber. away from this support wall. This is made possible thanks to 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 displacement of the differential piston away from the bearing wall, in association with a swirl system formed in the distribution wall, is advantageous in terms of demolding since the upper lip 132 slides sealingly on the part upper of the sliding shaft which is not damaged by the removal of the molding pin forming the negative impression which was used to mold the swirl system.

It can also be noted that the rest position is reached when the abutment bead 1241 formed by the guide wall 124 bears under the reentrant flap 1141.

On the other hand, the axial guidance of the pusher is ensured, firstly by the axial guide of the guide wall 124 between the sleeve 114 and the ring gear 113, and secondly by the engagement of the piston ring 135 and the axial rod 137 respectively in the main drum 117 and the inlet sleeve 116.

The Figures 4a and 4b represent two alternative embodiments of the embodiment of the figures 1 and 2 .

In the variant of the figure 4a , the return spring and precompression is integrally formed by the body 210 and has the reference numeral 2171. The spring extends in the extension of the main shaft 217 and bears under the plate 231 which forms the differential piston with its two lips 232 and 233. The spring 2171 thus extends concentrically around the ring 230 which forms the main piston 236. Apart from the return spring, the dispensing member 200 of the figure 4a can be identical to that of figures 1 and 2 .

In embodiment 4b, the dispensing member 300 comprises a return spring 3311 which is integrally formed by the piston member 330. Specifically, the spring 3311 extends from the underside of the tray 331. It bears at its lower end on the shoulder 3331 formed by the body 310. Apart from the particular shape of the spring, the dispensing member 300 may be identical to that of the figures 1 and 2 .

In these variant embodiments of Figures 4a and 4b , the dispensing member comprises only three components, namely a body, a pusher and a piston member, the return spring and precompression being integrated either to the body or to the piston member.

The embodiment of the dispensing member according to the invention shown on the 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 outer surface a fastening profile. The container 450 internally defines a fluid reservoir 5.

The dispensing member referenced as a whole by the 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 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 comprise a self-locking lip 412 in sealing contact with the wall Internal collar 453. A guide sleeve 414 may 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 includes a ring 413 that concentrically extends inside the guide bush 414. Thus, an annular space is created between the bushing 414 and the ring 413. The upper end of the ring 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 ring 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 support wall 421 and 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 bearing surface 4211 as well as an internal surface 4212. The bearing wall 421 and the skirt 422 have the general shape of a cup returned with the bottom of the cup formed by the wall of support 421 and the cylindrical side wall formed by the skirt 422. The bearing wall 421 comprises spring means in the form of tabs or elastically deformable blades 427 which extend from the inner surface 4212. Other on the other hand, the support wall 421 includes a retaining member 428 which also extends from the inner surface 4212. The retaining member 428 comprises at least one retaining profile 4281 having a retaining edge facing the surface In practice, the retaining member may comprise a plurality of retaining profiles formed outside a turret which extends downwardly from the bearing wall 421.

The skirt 422 comprises a distribution wall 423 and a guide wall 424.

The distribution wall 423 is connected at its upper end to the outer periphery of the support wall 421. The guide wall 424 is connected at its upper end to the lower end of the distribution wall 423. The distribution wall 423 comprises an outer surface and an inner surface 4232. The inner surface is at least partially cylindrical so as to form a sealed sliding shaft. The inner wall 4232 is advantageously formed with a swirl system 426 which forms a recessed network in the cylindrical surface 4232. This swirl system may include one or more swirl channels and a swirl chamber. On the other hand, the distribution wall 423 is formed with a dispensing orifice which passes through the wall so as to extend from the inner surface to the outer surface. The dispensing orifice 425 is centered with respect to the swirl system 426. The swirl system may be identical to that shown in FIGS. Figures 3a and 3b .

The guide wall 424 is engaged in the annular space formed between the guide sleeve 414 and the ring gear 413. The guide wall forms a shoulder 4241 intended to abut under the reentrant flap 4141 of the sleeve 414. Advantageously, the internal surface 4242 of the guide wall 424 forms a main shaft in which the main piston 4133 is movable in sealing contact. The guide wall 424 is biased by a spring 440 which pushes the shoulder 4241 against the reentrant flap 4141. The spring 440 can advantageously be made in one 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 within the guide wall 424 which internally forms the main shaft 4242.

The piston member 430 here forms a differential piston associated with a movable member of the inlet valve. The piston member 430 comprises a plate 431 which forms at its outer periphery two sealing lips 432 and 433. The plate 431 and its two lips together form the differential piston. In the rest position represented on the 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 can not 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 bearing wall 421. In addition, the piston member 430 forms an attachment element 439 which extends from the plate 431 in the direction of the support wall 421. This attachment element 439 comprises attachment heads 4392 located at the end of tabs 4391. The attachment heads 4392 are in position. taken between the inner wall 4212 and the retaining profiles 4281 formed by the retaining member 428. Thus, the heads can move on a limited path between the retaining profiles and the inner surface of the support wall. However, the elastically deformable tabs 427 urge the piston member 430 away from the support wall 421, so that the attachment heads 4392 are pushed in engagement with the retaining profiles 4281. The attachment heads 4392 can come into contact against the inner surface 4212 by flexing the elastically deformable tabs 427. There are thus stroke limiting means constituted by the cooperation of the retaining member with the fastening element.

The piston member 430 is thus trapped inside the pusher while being able to move axially on a limited stroke. The elastically deformable tabs 427, however, urge the piston member to the rest position, in which the gripping 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 represented on the figure 5 .

On the other hand, the piston member 430 also forms an axial central rod 437 which has at its lower end an inlet valve profile 438 which cooperates with the corresponding profile 4161 of the sleeve 416 to form together the flap valve. 'Entrance. In the rest position, the inlet valve is open.

Thus, a pump chamber 1 is created between the body the pusher and the piston member. The pump chamber 1 is isolated from the outside by the lower lip 433 but nevertheless communicates with the reservoir through the open inlet valve.

From the rest position of the figure 5 it is possible to exert a pressure on the external bearing surface 4211 of the support wall 421. This has the effect of moving the pusher and the piston member relative to the body. At first, the inlet valve will be closed because the axial rod 437 penetrates deeper into the sleeve 416 so as to create a contact sliding waterproof. From this moment, the pump chamber 1 is isolated from the outside. The fluid product in the pump chamber is then subjected to a pressure increase, which has the effect of moving the piston member 430 towards the support wall 421, against the spring force exerted by the elastic tabs 427. Thus, the lower lip 433 will move upward until it reaches 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 represented on the figure 6 . To reach this position, it is necessary that the pressure inside the pump chamber is greater than the stiffness of the elastically deformable tabs 427, which therefore act as a precompression spring. The piston member 430 can move towards the support wall 421 until the attachment heads 4392 abut against the inner surface 4212. In this position, which is that of the figure 6 , the lower sealing lip 433 of the differential piston is positioned at the swirl system. As soon as the pressure inside the chamber decreases again, the piston member 430 can move away again from the support wall 421 under the action of the elastic tabs 427. The piston member 430 returns finally in his rest position represented on the figure 5 .

The piston member 430 is trapped in the pusher while leaving a limited axial freedom of movement. It should also be noted that the precompression spring is integrally formed by the pusher. On the other hand, the captivity of the piston member and its limited displacement are entirely ensured by the pusher and the piston member; without additional room.

In the embodiment shown on the figure 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 internally forming a reservoir 5 and comprising an opening in the form of a 553 collar with no fixation profiles.

A difference with the embodiments of the preceding figures lies in the fact that the body no longer carries the fixation 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 to the tank opening. As such, the fixing ring 570 comprises a self-sealing lip 572 sealingly engaged inside the opening 553 of the container 550. The ring 570 comprises a bearing flange 571 resting 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 ring 573 which internally defines a housing for the body 510. ring 573 extends at its upper end by a guide sleeve 574. On the other hand, the ring 570 also forms a return spring and pre-compression 576 which extends integrally from the ring 573 concentrically to The guide sleeve 574 also forms on its outer surface a stop profile 5741 which cooperates with the pusher 520.

The body 510 is engaged inside the ring 570, or more precisely inside the ring 573 while coming into abutment on the re-entrant flange 575. As in the other previous embodiments, the body 510 forms a sliding shaft 517, a dip tube 515, an inlet sleeve 516.

The advantage of making the body and the ring into two distinct separate pieces is that it is possible to use different materials for the body and the ring. This is particularly justified because the ring is often a decorative element while the body is a functional element. If one wants for example to make the ring in a colored plastic material, this should not be the case of the dip tube which is visible very often through the container. On the other hand, it is easier to make the spring 576 with the ring 570 when the body is made separately.

The piston member 530 may be strictly identical to that of the previous embodiments of the Figures 1 to 4 . It may be noted, however, that the piston member 530 is made with a guide rib 5351 for non-sealing sliding around the sleeve 516.

Just as in the embodiments of the 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 support wall of the pusher when the pressure increases. This has the effect of unmasking a spray orifice 525 advantageously equipped with a swirling system 526 which is formed in the inner surface of the guide wall 523. It may also be noted that the lower end of the pusher is engaged with an abutment against the 5741 stop profile. The outer diameter of the pusher is substantially identical to that of the container. In this way, the fixing ring 570 is only very slightly visible.

Claims (11)

1. A fluid dispenser member (100; 200; 300; 400) having a dispensing wall (123; 223; 323; 423) defining an outside surface and inside surface, said wall being provided with a through dispensing orifice (125; 225; 325; 425) connecting the inside surface to the outside surface, the inside surface forming a leaktight slide cylinder for a piston (131, 132, 133; 231, 232, 233; 331, 332, 333; 431, 432, 433) suitable for moving in leaktight contact inside said cylinder for selectively unmasking the dispensing orifice, the piston being a differential piston which moves in response to variation in the pressure in a fluid chamber (1), said differential piston having at least one sealing lip (132, 133; 232, 233; 332, 333; 432, 433) in leaktight sliding contact with the slide cylinder, said piston forming a wall element of the fluid chamber (1) inside which fluid is selectively put under pressure, the inside surface, at the slide cylinder, forming a fluid swirl system (126; 226; 326; 426) immediately upstream from the dispensing orifice,
   the dispensing wall being formed by a substantially cylindrical skirt (122; 222; 322; 422) further provided with a guide wall (124, 224; 324; 424) defining an inside surface whose inside diameter is greater than the inside diameter of the slide cylinder,
   characterized in that the differential piston is integral with or secured to a main piston (136; 236; 336) in leaktight sliding contact in a main cylinder.
2. A fluid dispenser member according to claim 1, in which the slide cylinder, the dispensing orifice and the swirl system are formed integrally with the dispensing wall.
3. A fluid dispenser member according to any preceding claim, in which the dispensing wall is formed by a pusher (120; 220; 320; 420) having a push wall (121; 221; 321; 421) which is extended at its outer periphery by the dispensing wall.
4. A fluid dispenser member according to claim 3, in which the piston is urged resiliently against the push wall, and can be moved away from said push wall in order to unmask the dispensing orifice.
5. A fluid dispenser member according to claim 2, in which the piston is urged resiliently away from the guide wall and can be moved towards said guide wall.
6. A fluid dispenser member according to claim 3, in which the piston is urged resiliently away from the push wall and can be moved towards said push wall.
7. A fluid dispenser member according to claim 4 or claim 5, in which the push wall is provided with an inside surface (1212; 2212; 3212) which forms a wall element of the chamber.
8. A fluid dispenser member according to any preceding claim, having a body (110; 210; 310) serving to be associated with a fluid reservoir, said body forming a main cylinder in which a main piston slides.
9. A fluid dispenser member according to any preceding claim, in which the dispensing wall is formed by a substantially cylindrical skirt (422) which further forms a guide wall (424) defining an inside surface forming a main cylinder for a main piston.
10. A fluid dispenser member according to any preceding claim, in which the swirl system comprises at least one swirl channel (1262) and a swirl chamber (1261) centered on the dispensing orifice and optionally a peripheral feed ring (1263).
11. A fluid dispenser member according to any preceding claim, in which the swirl system forms a network that is recessed relative to the substantially cylindrical inside surface of the dispensing wall.

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