FR2876257A1 - Fluid cosmetic product e.g. cream, distributor for packaging product, has body with lateral wall closed at upper part by arch comprising orifice which cooperates with cap using specific sealing unit so as to seal orifice in airtight manner - Google Patents

Abstract

The distributor has a body (2) with a lateral wall (20) closed at its upper part by an arch (21) comprising an orifice (22). The orifice presents an area such that ratio of its area with area of an outer section of the wall is lower than 0.5. The orifice cooperates with a cap (6) using a specific sealing unit (12) to seal the orifice in an airtight manner when the distributor is closed. An independent claim is also included for a pot formed by a fluid cosmetic product distributor.

Description

DISPENSER OF A FLUID PRODUCT TYPICALLY OF A COSMETIC PRODUCT

FLUID

  FIELD OF THE INVENTION The invention relates to a dispenser of a fluid product, for example a cream, a paste, a gel, such as a cosmetic product.

  The invention relates more particularly to the case of the distributors which comprise a rigid body having an upper arch and a means for propelling the product formed by the cooperation of a piston adapted to move axially in said body, and a rod central able to be put in manual rotation.

STATE OF THE ART

  Dispensers of fluid cosmetic products of the type indicated above are already known.

  Thus, U.S. Patent No. 5,772,347 discloses a dispenser which comprises a dispensing head forming a valve.

  Similarly, French Patent No. 2,810,859 discloses a dispenser which comprises a dispensing head having a product application surface via at least one orifice opening into a cavity or groove.

  Similarly, French Patent No. 2,816,813 describes a dispenser which comprises a vault 25 pierced with orifices, and whose central rod is hollow so as to fill the dispenser by introducing the product by said hollow central rod.

PROBLEMS POSED t

  On the one hand, in general, the packaging of fluid products poses more problems than the packaging of non-fluid products. Thus, sealing problems arise more acutely in the case of fluid products. On the other hand, the packaged products are often air sensitive products, so it is important that it does not remain, after use of the product, residual product outside said body in the application head.

  Finally, it is important that the dispensers are adapted to a wide range of fluid products, the viscosity of the fluid product can vary over a wide range, some fluid creams being relatively rigid and being able to flow only under a slight pressure. stress, for example under the pressure constraint created inside said body during the manual rotation of said central rod, while other products may be liquid products.

  In addition, other problems may arise.

  Another problem often observed with known piston distributors, a problem that may be more or less serious depending on the rheological characteristics of the packaged product, lies in the fact that the movement of the piston in said body for the purpose of expelling the fluid, causes compression of the product in the body. As soon as the manual rotation of said central rod is stopped, the displacement of said piston immediately ceases, but so far, in view of this compression of said product, said product tends to flow a little further until dissipation of this residual stress of compression, which can cause either a waste of product or dirt.

  In addition, depending on the greater or less viscosity of said conditioned fluid product, there may be a leak between said piston and said body and / or said central rod. In the case of the less viscous fluid products, or those relatively viscous, which tend to adhere to the inner surface of said body, it is important that the piston cooperates with said rod and / or with said body sealingly.

  In addition, since the manual rotation of said rod may possibly lead to an unwanted and excessive flow of said product, it may be useful for the user to have a means for dosing said product.

  Finally, in particular in the case of the packaging of a cosmetic product, it is necessary to permanently offer users new distributors, the shelf life of products marketed being relatively low.

  The dispenser according to the invention makes it possible to respond to all or part of these problems. DESCRIPTION OF THE INVENTION According to the invention, the dispenser intended for the packaging of a fluid product, typically a fluid cosmetic product, comprises: a) a body comprising a side wall closed at its upper part by a vault provided with at least an orifice, forming a reservoir for containing said product, and open at its lower part, b) a piston capable of sliding in said side wall to form an internal cavity of variable volume intended to contain said product, an axial displacement of said piston according to an axial direction of said body pushing said product through said orifice for its application on a support, c) a central rod oriented in said axial direction and along a central axis of symmetry), said central rod being secured to a base, provided with a skirt and a bottom, forming a propulsion button cooperating with said side wall at its lower part so as to close it, said central rod cooperating with a central portion or nut of said piston, so as to form a means for propelling said product, a manual rotation of said base causing said axial displacement of said piston, an axial thrust of said product towards said orifice and a flow of said product by said orifice, d) and a cap having a skirt and a head, said skirt being intended to cooperate with said body, typically with said side wall at its upper part, so that said cap temporarily covers said vault when said dispenser is closed.

  This dispenser is characterized in that: 1) said orifice has a surface So, such that the ratio So / Sc is less than 0.5, Sc being the surface of the outer section of said side wall of said body, the surfaces So and Sc being measured in a plane perpendicular to said axial direction, 2) said orifice cooperates with said cap by means of a specific closing means 5 of said orifice, so as to have a typically sealed closure of said orifice when said distributor is closed.

  Such a distributor makes it possible on the one hand to solve the problems that often arise with the packaging of fluid products, in particular sealing problems.

  On the other hand, the fact that the cap cooperates directly with said orifice considerably limits the possibility of having a dead volume containing residual product that has been expelled. Indeed, the very shape of the vault makes it possible to apply, directly or indirectly, the product expelled on its support. By indirect application is meant the case where a finger removes the expelled cream and then applies it to a part of the body or face. Thus, particularly in the case of air-sensitive products, after the use of the product, no residual product remains outside said body in the application head.

  Finally, the dispensers according to the invention are suitable for a wide range of viscosity for packaged fluid products.

DESCRIPTION OF THE FIGURES

  All the figures relate to the invention.

  Figures 1 to 2b relate to the same type of dispenser (1). Figure la is an axial section along the axis (10) of the distributor (1) closed.

  Figure 1b is a perspective view of the dispenser (1) open and Figure 1a is a perspective view of the cap (6) of the dispenser (1), Figures 1b and 1c being on the same scale - scale reduced compared to that of Figure 1 a.

  Figure Id is a side view of the distributor (1) closed, and Figure is a top view of the distributor (1) closed.

  Figures 2a and 2b are axial sections similar to that of Figure la, which represent the two subsets of the distributor (1) before filling. Figure 2b shows a first subassembly formed by the body (2) and the cap (6), overturned for filling by the product (16). FIG. 2a shows a second subassembly formed by the base (5) and the threaded hollow central rod (4, 4 ') forming a monobloc molded piece secured to the piston (3).

  Figures 3a and 3b are axial sections which illustrate, in the filling position, an alternative dispenser (1) according to Figures la to 2b, variant which allows another filling mode of the dispenser. In this variant, the dispenser is filled by the central cavity (44) of the hollow rod (4 '), using a filling cannula (9), while the base (5) and the body ( 2) are already assembled.

  FIG. 3a illustrates the filling of the body (2) by the hollow rod (4 ') by means of said cannula (9), the product (16) passing through at least one upper lateral orifice (42), whereas, thanks to at least one lower lateral orifice (43), the air can escape from said body. Figure 3b illustrates the closure of the cavity (44) by a plug (45).

  FIGS. 4a to 4g illustrate a metering means (13) and a means of decompression (14) of the product (16) by relative axial displacement Z of the base (5) with respect to the body (2), during the rotation relative of the base (5) relative to the body (2).

  FIG. 4a shows the lower part (23) of said body (2) diagrammatically shown in a partial side view, cooperating with said base (5) shown in partial section, for forming said decompression means (14), said part lower part (23) carrying a female part (141) forming a periodic guide rail (143) of period 0, an elementary guide rail (144) comprising a low slope part (145) and a steep part (146) , said base comprising internally a male element (140) forming a radial stud (142). On the left part of FIG. 4a, the base (5) is in the position furthest from said body, whereas on the right part of the figure, the base (5) is in the position closest to said body (2), said base being raised from the axial distance OZ, said body (2) being assumed to be immobile.

  In addition, the lower part (23) of the body (2) and the base (5) cooperate to form said metering means (13), said base (5) carrying a said first element (130) and said portion lower part (23) of said body (2) carrying a plurality of N said second elements (131) angularly distant from the period or the angle 0, these elements cooperating when said base (5) is in the position closest to said body (2), as shown on the right side of Figure 4a.

  FIG. 4b is similar to FIG. 4a, said female part (141) or said guide ramp being carried on the inner surface of said base (5), and said male part (140) or said radial stud (142) being carried by said lower portion (23) on its outer surface.

  Figure 4c is a bottom view of said body (2) showing the arrangement of said second elements (131), with N = 4 and 0 = 90. Arrows forming an arc of 90 indicate both the direction of rotation and the fact that each dose corresponds to a rotation of 90.

  Figure 4d is an enlarged partial view of the right portion of Figure 4a surrounded by a dashed line.

  Figure 4e is an enlarged partial view of the right portion of Figure 4b surrounded by a dashed line.

  FIGS. 4f and 4g are partial views in radial sections of the cooperation of the first (130) and second (131) elements when they cooperate, said base (5) being in the position closest to said body (2), as on the right part of Figures 4a and 4b.

  In FIG. 4f, said first (130) and second (131) elements are represented before rotation to the left of said first element (130), the flexible ends of these elements (130, 131) permitting a passage of said first element (130) to the left, said second element (131) being presumed fixed, which has been symbolized by an arrow. In FIG. 4g, said first (130) and second (131) elements are represented after rotation to the left of said first element (130), the asymmetric slopes of the elements (130, 131) preventing any backward return of said first element (130). ) to the right, which has been symbolized by a crossed out arrow.

  FIGS. 5a and 5c are partial axial sections illustrating the cooperation of said central rod (4), said piston (3) and the lateral wall (20) of said body (2) in order to form said propulsion means (11) said product.

  In Figure 5a, the central rod (4) is a central threaded rod (40), and the nut (30) of said piston (3) is a threaded nut (30 '). In this case, the peripheral skirt (31) cooperates with the lateral wall (20) of said body (2) to prevent rotation of said piston (3) with respect to said body (2), either by axial grooves or ribs (27). ) carried by said lateral wall cooperating with complementary elements (33) carried by said peripheral skirt (31), or by virtue of a non-circular cross section of said wall (20) and said peripheral skirt (31) or said piston (3). ).

  Figure 5b shows, in cross section, the circular section of said central threaded rod (4, 40).

  FIG. 5c, similar to FIG. 5a, illustrates the case where the central rod (4) is a non-threaded rod (41), and where the nut (30) of said piston is a non-threaded nut (30 "). this case, as illustrated in FIG. 5d, the section of the central rod (41) and that of said non-threaded nut (30 ") is non-circular, so that the rotation of said rod (41) causes rotation of said piston (3). In addition, the side wall (20) of said body (2) at least one rib or helical groove (28) cooperating with a complementary element (34) of said peripheral skirt (31).

  Figure 5d shows, in cross section, the oval section of said central threaded rod (4, 41).

  FIGS. 6a and 6b are, in axial section, partial enlarged views of the part of FIG. 1a comprising the orifice (22) formed in the vault (21) of the body (2), and of its closure by a piece forming (7) an auxiliary sealing member.

  FIG. 6a shows schematically the case where the distributor (1) is closed, the cap (6) then comprising a projection (62, 63) coming to exert an axial pressure or forming an axial abutment, against said piece (7), in order to sealingly closing said orifice (22).

  FIG. 6b schematizes the case where the distributor (1) is open, said part (7) being then displaced upwards under the thrust of said product (16), and passing through said product whose flow has been represented by a arrow.

  Figures 7a to 7d illustrate other modes of orifices (22) and specific closure means (12). In Figures 7a, 7b and 7d, the central rod (4) has not been shown. FIG. 7a is an axial sectional view of a cap (6) comprising an outer shell (65) and a sealing insert (66), said insert forming an annular projection (63 ') intended to close said orifice (22); , 221).

  FIG. 7b is an axial sectional view of the upper part (23) of the body (2) and of the corrugated vault (21, 21 ') of the body (2), said vault comprising a lateral orifice (22, 221); ). FIG. 7c is a top view of the corrugated arch (21, 21 ') of FIG. 7b, in which the lateral orifice (22, 221) of radial width L, formed in the intermediate annular portion (212) forming a annular groove (212 '), extends over an angular sector of angle a. Also shown in dashed lines, on the right side of the figure, a plurality of 3 circular lateral elementary orifices (221, 222).

  FIG. 7d is an axial sectional view of the upper part (23) of FIG. 7b covered by the cap of FIG. 7a, so that the annular projection (63 ') closes the lateral orifice (22, 221); ), the skirt (60) of the cap (6) being detachably latched to said upper portion (23) when the dispenser is closed.

  In Figures 7b and 7d, the central rod (4) has not been shown.

  FIGS. 8a to 8d are diagrammatic views, in axial section, which illustrate other modes of orifices (22) and specific closure means (12) according to the invention. In these arrangements, said orifice (22) is a central orifice (220).

  Figure 8a, similar to Figure 7a, shows a cap (6) comprising a skirt (60) and a head (61) with a central projection (62) secured to the head (61).

  FIG. 8b, similar to FIG. 7b, shows the upper part (23) of the body (2) and its flat roof (21) comprising a central orifice (220).

  Figure 8c, similar to Figure 7d, shows the upper part (23) and the roof (21) of Figure 8b covered with the cap of Figure 8a.

  Figure 8d, similar to Figure 8c, shows the case where the vault (21) forms a bowl.

  Figures 9a to 9e are schematic views, in axial section, which illustrate other terms of distributors (1). In these conditions also, said orifice (22) is a central orifice (220).

  In this embodiment, an application means (8) or an application material (80) is secured to the vault (21).

  Figure 9a is similar to Figure 8a, and shows a cap (6) with a central projection (62) whose lower portion has a profile adapted to that of the application material (80).

  Figure 9b shows an application means (8) comprising an application material (80) attached to an annular support (81).

  FIG. 9c, similar to FIG. 8b, shows the upper part (23) of the body (2) with its vault provided with a recessed annular portion (213) surrounding said central orifice (220), and intended to cooperate with said support annular (81).

  FIG. 9d, similar to FIG. 8c, shows the application means (8) typically irreversibly snapped to said recessed portion (213), and the cap (6) reversibly latched to the side wall (20). of the body (2).

  FIG. 9e, similar to FIG. 9d, represents another modality of FIG. 9d, in which said application material (80) is directly secured, by its rim (800), to said arch (21), at the periphery said central orifice (220).

  In Figures 9c to 9e, the central rod (4) has not been shown.

  FIGS. 10a and 10b are similar to FIGS. 6a and 6b and illustrate the case where said auxiliary closure means (7) forms a one-piece piece (72) with said vault (21), said one-piece piece (72) comprising a hinge ( 721) and a shutter tab (720).

  Figure 10c is a partial axial section of the bottom of the distributor (1), the piston (3) not shown in this figure.

  FIGS. 1 to 11 c relate to a distributor (1) of shape, i.e. of non-circular cross-section.

  Fig. 11a is a side view.

  Figure 1b is a view from below.

  The figure is a partial axial section in the plane B-B of FIG. 11 b. In this dispenser (1) of oval cross section, the side wall (20) of said body (2), the skirt (50) of said base (5) and the skirt (60) of said cap (6) have an external cross section oval, while the button (5 ') integral with the central threaded rod (4, 40) is of circular section. Said button (5 ') cooperates with said base (5) so as to form said decompression means (14) by axial displacement of said knob (5') with respect to said base (5).

  Figures 12a to 12c, similar to Figures 11a to 1c, illustrate a variant of cooperation between said body (2) and said base (5).

  FIG. 12a corresponding to FIG. 1a shows a distributor (1) whose base (5) is concealed by the wall (20) of the body, the base (5) being contained inside said wall (20). ) of said body (2) and secured to said wall (20) of said body (2). Figure 12b corresponds to Figure 11b.

  Figure 12c corresponds to Figure 1c.

  DETAILED DESCRIPTION OF THE INVENTION

  According to the invention, said So / Sc ratio can be less than 0.25, and can typically range from 0.05 to 0.20.

  Indeed, since it is a matter of dispensing a fluid product, it may be advantageous to have a relatively low So / Sc ratio, this ratio may depend on the viscosity of said product, and typically decrease with the viscosity of said product.

  Advantageously, and as illustrated for example in FIGS. 6a, 7d, 8c and 10a, when said cap (6) cooperates with said body (2), said dispenser (1) then being closed, said cap (6), and typically its head (61), can cooperate with said arch (21), so that said cap (6) forms all or part of said specific sealing means (12) of said orifice (22).

  In this case, it is not possible to secure the cap (6) to the body (2) without automatically closing said orifice (22). The cap (6) is secured to said body (2) by the cooperation of a rib and a groove forming said axial latching means (17). In Figure 7d, the groove is carried by the upper portion (24) of the side wall (20), while the rib is carried by the skirt (60) of the cap (6) on its inner surface. This is the opposite in Figures 8c and 8d.

  In addition, the cap (6) is generally secured to said body (2) when the skirt (60) or its wall (600) comes almost in abutment against the skirt (50) or the bottom wall (500) of the base ( 5) as shown in Figure 1a, or almost abuts against a shoulder (29) formed at the top of said skirt (20) as shown in Figures 7d, 8c and 8d.

  According to one embodiment of the invention illustrated in FIGS. 8a to 9e, said orifice (22) may be a central orifice (220), said head (61) of the cap (6) comprising a central projection (62) intended to cooperate by its lower end (64), directly or indirectly, with said central orifice (220), so as to form all or part of said specific closing means (12) of said orifice (22).

  According to another embodiment of the invention, and as illustrated for example in FIGS. 1a and 7c, said orifice (22) may be a lateral orifice (221) or offset with respect to said central axis of symmetry (10 ') of said body (2) or said distributor (1), and said cap (6) may comprise internally an annular projection (63, 63 ') forming a cylindrical ring, typically integral with said head (61), said annular projection (63) having a lower end (64, 64 ') cooperating with said lateral orifice (221) to form all or part of said specific sealing means (12).

  As illustrated in FIG. 7c, said lateral orifice (221) may extend over an angular sector of said vault forming an angle α ranging from 45 to 190, and preferably from 90 to 160.

  Said lateral orifice (221) may have a radial width L ranging from 0.1.R to 0.6.R, positioned at a distance from said axial direction taken for origin, ranging from 0.1.R to 0.4. R, R corresponding to the radius of said vault (21) when it is circular or at its largest dimension when it is non-circular.

  According to an alternative embodiment, said radial width L may be a radial width The variant with the angular orientation α, so that said orifice may have for example the shape of an elongated droplet.

  Advantageously, said annular projection (63) of said cap (6) may have a symmetry of revolution, so that said cap (6) can form all or part of said specific sealing means (12) whatever the orientation relative to said cap (6) relative to said body (2) when said cap (6) is secured to said body (2), typically by snapping, to close said distributor (1).

  As illustrated in FIGS. 7d and 8a to 9e, said orifice (22, 220, 221) can cooperate directly with said projection (62, 63), said lower end (64, 64 ') of said projection (62, 63). closing said orifice (22, 220, 221) directly when said distributor (1) is closed.

  As represented in FIGS. 1a, 3a and 7b, said vault (21) may be a non-planar vault, and typically a corrugated vault (21 ') having a symmetry of revolution, with a central portion (210) and a peripheral portion ( 211) offset upwardly relative to an intermediate annular portion (212) offset downward, said orifice (22) being typically located in said intermediate annular portion (212).

  Said intermediate annular portion (212) may form an annular groove (212 ') in the vault (21), said orifice (22) being located in said annular groove (212'), on a portion of said annular groove (212 ') ).

  According to another embodiment of the invention illustrated in FIGS. 1a, 6a and 10a, said orifice (22, 220, 221) can cooperate with an auxiliary closure element (7), typically a plug forming a valve (70), said lower end (64, 64 ') of said projection (62, 63) blocking said auxiliary closure member (7, 70) when said distributor (1) is closed, typically by exerting axial pressure on said auxiliary shutter member (7, 70), or forming an axial stop for said auxiliary sealing member (7, 70).

  As illustrated in FIG. 6a, said auxiliary closure element (7, 70) forms a part (71) distinct from said vault (21), said distinct part (71) being secured to said vault (21), typically by snapping.

  As illustrated in FIG. 10a or 10b, said closure element (7, 70) can form a piece (72) integral with said vault (21), said one-piece piece (72) typically forming a tongue (720) connected to said arch (21) by a thinned hinge portion (721).

  As illustrated in FIGS. 9b to 9e, said orifice (22, 220, 221) can cooperate with an application means (8) typically comprising a porous material or in the divided state (80), and possibly a support (81). ) of said material (80), secured to said orifice (22, 220, 221), so that said application means is imbibed by said product during said flow of said product through said orifice (22), and said specific sealing means (12) may exert its role or action on said material (80) instead of exerting it on said orifice (22, 220, 221).

  Typically, and as illustrated in Figures la and 3a, said body (2) and said piston (3) 25 may be of circular section, said button (5 ') being confused in this case with said base (5).

  As illustrated in FIG. 5a, said central rod (4) can be a central threaded rod (40) cooperating with a threaded nut (30 ') of said piston (3), said body (2) comprising an anti-rotation axial groove or rib ( 27) cooperating with a complementary anti-rotation element (33) of said piston (3) at its periphery, so that said piston (3) does not rotate relative to said body (2) during a rotation of said base (5) or said button (5 ').

  However, as illustrated in FIG. 5c, said lateral wall (20) of said body (2) may comprise at least one groove or helical rib (28) cooperating with a complementary element (34) of said piston (3) at its periphery, and said central rod (4) may be a smooth central rod (41) of non-circular section cooperating with a homothetic smooth nut (30 ") of said piston (3), so that a rotation of said central rod (4) causes a rotation of said piston (3) and thus its axial displacement.

  As illustrated in Figures 1 lb and 12b, the side wall (20) of said body (2), said piston (3) and the skirt (50) of said base (5) may have non-circular homothetic sections, the bottom ( 51) of said base (5) comprising an opening for the passage of said button (5 ') of circular section.

  In this case, said central rod (4) may be a threaded rod (40) cooperating with a threaded nut (30 ') of said piston (3).

  As illustrated in FIG. 4a, said button (5 ') can cooperate with said body (2) or said base (5) to form a metering means (13) so as to dispense a predetermined dose or quantity of said product per cycle of rotation, whenever said button (5 ') undergoes, relative to said body (2) or said base (5), an angular rotation co over a predetermined angular range 0.

  In FIG. 4a, said base (5) forms said knob (5 ') which cooperates with the lower part (23) of said body (2).

  Said angular range 9 may be equal to 360 / N, with N being typically from 1 to 10, and preferably from 2 to 6.

  As illustrated in FIGS. 4a and 4b, said metering means (13) can be formed by cooperation of a single element called said first element (130) opposite N element (s) said second (s) (131). , so that any passage of said first element (130) facing a second element (131) during said rotation triggers a sensory signal, for example a sound signal or a clicking sound, or a touch signal formed for example by a point of resistance to rotation, and preferably so that said dosing means also forms a means preventing a rearward rotation or a rear passage of said first element (130) facing a second element (131).

  As illustrated in FIGS. 4a and 4b, said button (5 ') can cooperate with said body (2) or said base (5) so as to form a means of decompression (14) of said product by axial displacement of said button ( 5 ') with respect to said body (2) or said base (5) during said rotation, an angular rotation w causing an axial displacement Z (w) of said base (5) relative to said body (2), the value maximum ZM of said axial displacement typically ranging from 0.5 to 2 mm.

  As illustrated in FIGS. 4d and 4e, said angular rotation w can cause an axial displacement Z (w) of said knob (5 ') relative to said body (2), thanks to male (140) and female (141) elements which cooperate in rotation, said male element (140) typically comprising at least one radial stud (142) guided by said female element (141) formed for example by a circular guide ramp (143) formed of N elementary guide ramps (144) , typically N grooves, so that, for each cycle of rotation, said button (5 ') approaches first of said vault (21) passing from Zo to ZM, then departs sharply at the end of cycle to return to Zo, so as to increase the volume of said cavity and thus, by dropping the internal pressure of said product in said cavity, and to avoid a complementary flow of said product through said orifice (22) at the end of said rotation manual said button (5 ').

  According to a variant of the invention illustrated in FIG. 4d, said male element or said radial stud (142) may be integral with said knob (5 '), and said female element (141) or said guide ramp (143) may be integral with said body (2) or said base (5).

  According to another variant illustrated in FIG. 4e, said male element or said radial stud (142) may be integral with said body (2) or said base (5), and said female element (141) or said guide rail (143) ) can be integral with said button (5 ').

  As illustrated in FIG. 4a, said guide ramp (143) if N = 1, or said elementary guide ramp (144) if N 1, may comprise a first part (145) with a small slope and a second part (146). steep slope, said first portion (145) extending angularly at least 0.6.0, so that said decompression means also forms a means for preventing a rearward rotation of said knob (5 '). Thus, a rear rotation of said knob (5 ') would offer unusual and high resistance, so that in practice this means prevents any air intake in said distributor (1).

  As illustrated in FIG. 4a, said decompression means (14) can form said metering means (13). In this case, for any angular rotation w extending over said predetermined angular range 0 forming a period, both said decompression means (41) and said metering means (13) are activated. However, the invention also includes the case where these two means (13) and (14) are independent of one another, one having a predetermined period 0 and the other having a predetermined period 0 'other than O. As illustrated in FIGS. 5a and 5c, said piston (3) may comprise, in addition to said nut (30, 30 ', 30 ") at its center, a peripheral skirt (31) with said body at its periphery, and a central plate (32) solidarisant said peripheral skirt (31) to said nut (30) and exerting an axial thrust on said product for its flow.

  Advantageously, said nut (30, 30 ', 30 ") of said piston (3) may comprise a flexible upper part (300) intended to seal between said piston (3) and said central rod (4), and a part rigid lower part (301) integral with said central plate (32), said flexible upper part (300) having a small relative thickness and a small relative clearance with said central rod (4), said rigid lower part (301) having a large relative thickness and a greater clearance with said central rod (4), so that each portion (301, 302) of said nut (30, 30 ', 30 ") provides a distinct function: sealing for said upper part (300 ), and the mechanical resistance to effort for said lower part (301).

  Said peripheral skirt (31) of said piston (3) may comprise a flexible upper part (310) intended to seal between said piston (3) and said lateral wall (20) of said body (2), and a rigid lower part (311) secured to said central plate (32), said flexible upper portion (310) having a small relative thickness and a small clearance relative to said side wall (20), said rigid lower portion (311) having a high relative thickness and a greater clearance with said side wall (20), so as to achieve a seal of the piston (3) relative to said side wall (20) without excessive friction between said side wall (20) and said piston (3).

  As illustrated in FIGS. 1a and 3a, said threaded nut (30 ') of said piston (3), and typically said rigid lower part (301), comes into abutment against said base (5), so as to allow filling by the bottom of said body (2) provided with said cap (6), said body (2) being in an inverted position, then an assembly of an assembly comprising said base (5), said central rod (4), as well as said piston ( 3) cooperating with said rod, said assembly being typically an axial latching.

  As illustrated in FIGS. 1a and 3a, said skirt (50) of said base (5) or said knob (5 ') can form a bottom wall (500) surrounding said lateral wall (20) of said body at its lower part (23). ), and said skirt (60) of said cap (6) can form an upper wall (600) surrounding said side wall (20) of said body (2) at its upper portion (24), so that said top walls (20) ( 600) and lower (500), of the same cross section, meet at their end when said distributor (1) is closed.

  As illustrated in FIGS. 7b, 8b and 10c, said lateral wall (20) of said body (2) may comprise an upper circular recess (25) and / or a lower circular recess (26), said recesses (25, 26) being typically external and forming shoulders, so as to cooperate respectively with said skirt (60) of said cap (6) and with said skirt (50) of said base (5) or said knob (5 '), so that said distributor (1), closed, may possibly have a same cross section along its entire height, or in such a way that the skirt (60) of said cap (6) and the skirt (50) of said base are connected to said lateral wall ( 20) in the same cross section.

  As illustrated in FIG. 12c, said body (2) may comprise an outer upper circular recess (25) cooperating with said skirt (60) of said cap (6), said lateral wall (20) of said body may comprise an inner lower circular recess (26 '), and said skirt (50) of said base (5) or said knob (5') may comprise, in whole or in part, an inner projection (501) cooperating with said inner lower recess (26 '), so that said distributor (1), closed, optionally has a constant cross section over its entire height.

  As illustrated on the right side of FIG. 7c, said orifice (22) may comprise a plurality of elementary orifices (222).

  Generally, said central rod (4) and said knob (5 '), or said base (5), can form a one-piece molded piece of plastics material.

  As illustrated in Figures 1a, 2b and 3a, said central rod (4) may be a hollow rod (4 ').

  As illustrated in FIG. 3a, said hollow rod (4 ') may comprise upper lateral openings (42) intended for loading or filling said product dispenser, and lower side openings (43) forming vents for evacuation of the dispenser. during said filling, said hollow rod (4 ') forming an inner cavity (44) allowing the passage of a filling cannula (9), said cavity (44) being closed by a plug (45) after said filling.

  As illustrated for example in FIGS. 10c and 11c, said lateral wall (20) at its lower part (23) and said base (5), or said knob (5 '), can cooperate by axial latching means (15). ), typically irreversible, after filling said cavity. Said decompression means (14) may optionally also form said axial latching means (15).

  As illustrated in particular in FIG. 1a, said lateral wall (20) at its upper part (24) and the skirt (60) of said cap (6) can cooperate by axial locking means (17), which are typically reversible, so as to to be able to close / open at will said distributor (1).

  According to the invention, said cap can form a molded part, in a typically transparent thermoplastic material.

  As illustrated in FIGS. 7a to 7d, said cap (6) may comprise a shut-off insert (66) intended to temporarily cover said vault (21) when said distributor (1) is closed, in order to form said shut-off means specific (12) of said orifice (22).

  Another object of the invention is constituted by a pot formed by the dispenser according to the invention, said dispenser or said pot having a height H typically ranging from 40 mm to 80 mm, the pots of circular section having a mean diameter D on said height typically ranging from 30 mm to 80 mm, with an H / D ratio ranging from 0.5 to 2.

  This pot may have a cross section or a constant diameter D over the entire height H. Another object of the invention is constituted by a dispenser (1) intended for the conditioning of a fluid product, typically a fluid cosmetic product, comprising a) a body (2) comprising a side wall (20) closed at its upper part (24) by a vault (21) having at least one orifice (22), forming a reservoir for containing said product, and open at its lower part (23), b) a piston (3) slidable in said side wall (20) to form an internal cavity of variable volume for containing said product, an axial displacement of said piston (3) according to a axial direction (10) of said body (2) pushing said product through said orifice (22) for its application on a support, c) a central rod (4) oriented in said axial direction (10) and along a central axis of symmetry (10 '), said central stem (4) being secured to a propulsion button (5 ') typically forming a base (5), provided with a skirt (50) and a bottom (51), cooperating with said side wall (20) at its lower part (23) so as to close it, said central rod (4) cooperating with a central part or nut (30) of said piston (3), so as to form a means of propulsion (11) of said product, a rotation manual operation of said knob (5 ') causing said axial movement of said piston (3), an axial thrust of said product towards said orifice (22) and a flow of said product through said orifice (22), d) and a cap (6) provided with a skirt (60) and a head (61), said skirt (60) being intended to cooperate with said body (2), typically with said side wall (20) at its upper part (24), so as to said cap (6) temporarily covers said vault (21) when said dispenser (1) is closed, characterized in that: 1) said orifice (22) has a So face, such that the So / Sc ratio is less than 0.5.Sc being the surface of the outer section of said side wall (20) of said body (2), the So and Sc surfaces being measured in a plane perpendicular to said axial direction (10), 2) said body (2) and said base (5) cooperate to form a decompression means (14) of said product by an axial displacement of said base (5) relative to said body ( 2) during said rotation, an angular rotation w causing an axial displacement Z (w) of said base (5) relative to said body (2), the maximum value ZM of said axial displacement typically ranging from 0.5 to 2 mm.

  Another object of the invention is constituted by a dispenser (1) intended for the conditioning of a fluid product, typically a fluid cosmetic product, comprising: a) a body (2) comprising a side wall (20) closed to its part upper (24) by a vault (21) having at least one orifice (22), forming a reservoir for containing said product, and open at its lower part (23), b) a piston (3) adapted to sliding in said side wall (20) to form a variable volume internal cavity for containing said product, axial displacement of said piston (3) in an axial direction (10) of said body (2) pushing said product through said orifice ( 22) for its application on a support, c) a central rod (4) oriented in said axial direction (10) and in a central axis of symmetry (10 '), said central rod (4) being integral with a propulsion button (5 ') typically forming a base (5), provided with a upe (50) and a bottom (51), cooperating with said side wall (20) at its lower part (23) so as to close it, said central rod (4) cooperating with a central part or nut (30). ) of said piston (3), so as to form a propulsion means (11) of said product, a manual rotation of said knob (5 ') causing said axial displacement of said piston (3), an axial thrust of said product towards said orifice (22); ) and a flow of said product through said orifice (22), d) and a cap (6) provided with a skirt (60) and a head (61), said skirt (60) being intended to cooperate with said body (2), typically with said side wall (20) at its upper part (24), so that said cap (6) temporarily covers said vault (21) when said dispenser (1) is closed, characterized in that : 1) said orifice (22) has a surface So, such that the ratio So / Sc is less than 0.5.Sc being the surface of the outer section d e said side wall (20) of said body (2), the surfaces So and Sc being measured in a plane perpendicular to said axial direction (10), 2) said central portion or nut (30, 30 ', 30 ") of said piston (3) comprises a flexible upper part (300) intended to seal between said piston (3) and said central rod (4), and a rigid lower part (301) integral with said central plate (32), said upper part flexible (300) having a small relative thickness and a small relative clearance with said central rod (4), said rigid lower portion (301) having a large relative thickness and a greater clearance with said central rod (4), so as to each part (301, 302) of said nut (30, 30 ', 30 ") provides a distinct function: sealing for said upper part (300), and the mechanical resistance to effort for said lower part (301). ).

EXAMPLES OF REALIZATION

  All the figures are exemplary embodiments of dispensers (1).

  A) A distributor (la) according to FIGS. 1a to 2b was manufactured. The various parts of the distributor (1) were manufactured by molding thermoplastic materials, then assembled, typically by axial snapping, so as to obtain firstly the assembly of parts of Figure 2a and the part assembly of the Figure 2b.

  This distributor (1) had an outside diameter D of 62 mm and a total height H of 60 mm.

  Figures 2a and 2b illustrate the filling of such a dispenser.

  B) A distributor (1b) according to FIGS. 3a and 3b was manufactured. This dispenser (1) differs from the previous one in that the hollow central rod (4, 4 ') comprises upper (42) and lower (43) lateral openings which allow filling of the dispenser by the hollow central rod (4, 4 '), the hollow central rod (4, 4') being then closed by a plug (45).

  C) A distributor (1c) according to FIGS. 7a to 7d was manufactured. This distributor (1c) differs from the distributor (la) in that, on the one hand, there is no auxiliary sealing element or valve (7) for closing the lateral orifice (22, 221), and in that the cap (6) comprises a closure insert (66) which directly closes the lateral orifice (22, 221).

  D) A distributor (1d) according to FIGS. 8a and 8b has been manufactured, as well as a distributor (1 of) according to FIG. 8d. In these distributors (1d, Id '), the orifice (22) is a central orifice (220) and the upper part (24) of the lateral wall (20) comprises a circular recess (25) for receiving the upper wall ( 600) of the cap (6), so that the body (2) and the cap (6) have the same outside diameter D. E) A distributor (1a) according to FIGS. 9a to 9d has been manufactured, as well as a distributor (the ') according to Figure 9e. In this case, the central orifice (200) is closed by an application means (8) integral with the arch (21) of said body, this application means (8) forming a porous application material (80) able to pass said product when manually employing said propulsion means (11), this application material (80) may be a block of foam or felt.

  In the dispenser (1 e), this application means (8) comprises a support (81) of said application material (80), which support is snap-fit to the arch (21) of said body (2).

  In the dispenser (1 '), said application material (80) is secured by its flange (800) to the vault (21).

  F) A dispenser (1f) according to FIGS. 11a to 11c was manufactured. In this case, the dispenser (1) is a shape dispenser, non-circular, the button (5 ') forms a circular section wheel secured to said rod (4), the base (5) forming a separate part of the button (5 ') and complementary to the button (5') as shown in Figure 11 has, with respect to its cross section.

  G) A distributor (1g) according to FIGS. 12a to 12c has been manufactured, which dispenser differs from the distributor (1f) according to FIGS. 11a to 11c, in that in the latter case the skirt (50) of the base (5) is an outer skirt to said lower part (23), whereas the skirt (50) is an inner skirt to said lower part (23) of the body (2) in the case of the distributor (1g) , this skirt (50) being in all cases snapped to said lower part (23) of said body (2).

  ADVANTAGES OF THE INVENTION The dispensers (1) according to the invention have many advantages.

  In fact, on the one hand, they make it possible to condition any type of fluid product, in particular of a fluid cosmetic product, by ensuring a tight closure. On the other hand, they can package air sensitive products, in particular because it is important that it does not remain, after use of the product, residual product outside said body in the application head.

  These dispensers are adapted furthermore adapted to a wide range of viscosity of the fluid products to be packaged.

  In addition, these dispensers may include a decompression or dosing means, very useful in practice not to waste said product or not to spread unnecessarily outside of said dispenser.

  These distributors may have a piston adapted to any type of fluid, without risk of seeing a leak between the piston and the body or between the piston and the central rod. Finally, the distributors according to the invention offer a wide variety of practical embodiments, so as to be able to permanently offer users new distributors.

LIST OF REFERENCES

  Dispenser 1 Axial direction 10 Central symmetry axis 10 'Propulsion means 11 Specific closure means 12 Means of metering 13 First (single) element 13 0 Second element 131 Decompression / axial displacement means of 5 14 Male element 140 Female element 141 Radial Plot 140 142 Guide Ramp 141 143 Basic Guide Ramp 144 l Part 144 Low Slope 145 2nd Part 144 High Slope 146 Axial Ratchet Means 20 and 15 15 Product 16 Ratchet axial 20 and 6 17 Body 2 Side wall 20 Vault 21 Corrugated arch 21 'Central portion 210 Peripheral portion 211 Intermediate annular portion 212 Annular groove 212' Removed portion for securing 8 213 Orifice 22 Central orifice 220 Lateral orifice 221 Elementary orifice 222 Part lower than 20 23 Upper part of 20 24 Upper circular recess (outer) of 20 ...

25 Lower circular recess (outer) of 20 ....

26 Circumferential inferior (inner) recess of 20 .... 26 'Anti-rotation axial groove or rib of 20 27 Spiral groove or rib of 20 28 Shoulder corresponding to 25 29 Piston 3 Nut 30 Threaded nut 30' Non-threaded nut 30 " Flexible upper part 300 Rigid lower part 301 Peripheral skirt 31 Flexible top sealing part 310 Rigid lower part 311 Central plate 32 Complementary element 27 anti-rotation 33 Complementary element of 28 34 Central rod 4 Center hollow rod 4 'Central threaded rod 40 Smooth central stem 41 Upper side vents 42 Lower side vents 43 4 '44 cavity 44 44 45 cap Base 5 Knob or knob' Skirt 50, 50 'Surrounding bottom wall 23 500 Inner projection 501 Bottom 51, 51' Cap 6 Skirt 60 Wall superior surrounding 24 600 Head 61 Center projection 62 Annular projection forming a crown 63, 63 'Lower end of 62.63 64, 64' Outer shell of 6 65 Shutter insert 6 66 Auxiliary shut-off element 7 Shutter cap 70 Separate part 71 Monobloc piece 72 Tab 720 Hinge 721 Securing medium of 21 8 Application material 80 Connector flange 800 Support 80 81 Cannula loading 2 via 4 '9

Claims (49)

  1. Dispenser (1) for conditioning a fluid product, typically a fluid cosmetic product, comprising: a) a body (2) comprising a side wall (20) closed at its upper part (24) by a vault ( 21) provided with at least one opening (22), forming a reservoir for containing said product, and open at its lower part (23), b) a piston (3) slidable in said side wall (20) for forming an internal cavity of variable volume for containing said product, axial displacement of said piston (3) in an axial direction (10) of said body (2) pushing said product through said orifice (22) for application to a support, c) a central rod (4) oriented in said axial direction (10) and in a central axis of symmetry (10 '), said central rod (4) being integral with a propulsion button (5') forming typically a base (5), provided with a skirt (50) and a bottom (51), cooperating with said side wall (20) at its lower part (23) so as to close it, said central rod (4) cooperating with a central part or nut (30) of said piston (3), so as to form a propulsion means ( 11) of said product, a manual rotation of said knob (5 ') causing said axial displacement of said piston (3), an axial thrust of said product towards said orifice (22) and a flow of said product through said orifice (22), d) and a cap (6) provided with a skirt (60) and a head (61), said skirt (60) being intended to cooperate with said body (2), typically with said side wall (20) at its upper part (24), so that said cap (6) temporarily covers said vault (21) when said dispenser (1) is closed, characterized in that: 1) said orifice (22) has a surface So, such that the So / Sc ratio is less than 0.5, Sc being the surface of the outer section of said side wall (20) of said body (2), the S and S S surfaces being measured in a plane perpendicular to said axial direction (10), 2) said orifice (22) cooperates with said cap (6) through a specific closure means (12) of said orifice (22), so as to have a typically sealed closure of said orifice (22) when said distributor (1) is closed.   The dispenser of claim 1 wherein said So / Sc ratio is less than 0.25, and typically ranges from 0.05 to 0.20.   3. Dispenser according to any one of claims 1 to 2 wherein, when said cap (6) cooperates with said body (2), said distributor (1) being then closed, said 1 o cap (6), and typically its head ( 61), cooperates with said arch (21), so that said cap (6) forms all or part of said specific sealing means (12) of said orifice (22).   4. Dispenser according to any one of claims 1 to 3 wherein said orifice (22) is a central orifice (220), said head (61) of the cap (6) comprising a central projection (62) for cooperating with its lower end (64), directly or indirectly, with said central orifice (220), so as to form all or part of said specific closing means (12) of said orifice (22).   5. Dispenser according to any one of claims 1 to 3 wherein said orifice (22) is a lateral orifice (221) or offset from said central axis of symmetry (10 ') of said body (2) or said distributor (1), and wherein said cap (6) internally comprises an annular projection (63, 63 ') forming a cylindrical ring, typically integral with said head (61), said annular projection (63, 63') having a lower end (64, 64 '). ') cooperating with said lateral orifice (221) to form all or part of said specific sealing means (12).   The dispenser of claim 5 wherein said lateral orifice (221) extends over an angular sector of said vault at an angle of from 45 to 190, and preferably from 90 to 160.   7. Dispenser according to any one of claims 5 to 6 wherein said lateral orifice (221) has a radial width L of 0.1. R at 0.6.R, positioned at a distance from said axial direction taken for origin, ranging from 0.1.R to 0.4.R, R corresponding to the radius of said arch (21) when it is circular or at its largest dimension when it is non-circular.   8. Dispenser according to claims 6 and 7 wherein said radial width L is a radial width The variant with the angular orientation a.   9. Dispenser according to any one of claims 5 to 8 wherein said annular projection (63) of said cap (6) has a symmetry of revolution, so that said cap (6) can form all or part of said closure means specific (12) irrespective of the relative orientation of said cap (6) with respect to said body (2) when said cap (6) is secured to said body (2), typically by snapping, to close said distributor (1).   10. Dispenser according to any one of claims 1 to 9 wherein said orifice (22, 220, 221) cooperates directly with said projection (62, 63), said lower end (64, 64 ') of said projection (62, 63). closing said orifice (22, 220, 221) directly when said distributor (1) is closed.   11. Dispenser according to any one of claims 1 to 10 wherein said vault (21) is a non-planar arch, and typically a corrugated arch (21 ') having a symmetry of revolution, with a central portion (210) and a peripheral portion (211) shifted upwardly with respect to an intermediate annular portion (212) offset downward, said orifice (22) being typically located in said intermediate annular portion (212).   12. Dispenser according to claim 11 wherein said intermediate annular portion (212) forms an annular groove (212 ') in the vault (21), said orifice (22) being located in said annular groove (212'), on a portion of said annular groove (212 ').   13. Dispenser according to any one of claims 1 to 9 wherein said orifice (22, 220, 221) cooperates with an auxiliary closure member (7), typically a valve plug (70), said lower end (64, 64 ') of said projection (62, 63) blocking said auxiliary closure member (7, 70) when said distributor (1) is closed, typically by exerting axial pressure on said auxiliary closure member (7, 70), or by forming an axial abutment for said auxiliary closure member (7, 70).   14 dispenser according to claim 13 wherein said auxiliary closure member (7, 70) forms a part (71) separate from said vault (21), said separate piece (71) being secured to said vault (21), typically by snap.   15. Dispenser according to claim 13 wherein said closure member (7, 70) forms a part (72) integral with said vault (21), said one-piece piece (72) typically forming a tongue (720) connected to said vault (21) by a thinned hinge portion (721).   16. Dispenser according to any one of claims 1 to 13 wherein said orifice (22, 220, 221) cooperates with an application means (8) typically comprising a porous material or in the divided state (80), and optionally a support (81) of said material (80), secured to said orifice (22, 220, 221), so that said application means is imbibed by said product during said flow of said product through said orifice (22) and wherein said specific sealing means (12) exerts its function or action on said material (80) instead of exerting it on said orifice (22, 220, 221).   17. Dispenser according to any one of claims 1 to 16 wherein said body (2) and said piston (3) are of circular section, said knob (5 ') merging in this case with said base (5).   18. Dispenser according to claim 17 wherein said central rod (4) is a central threaded rod (40) cooperating with a threaded nut (30 ') of said piston (3), said body (2) comprising an anti axial groove or rib -rotation (27) cooperating with an anti-rotation complementary element (33) of said piston (3) at its periphery, so that said piston (3) does not rotate relative to said body (2) during a rotation of said base (5) or said knob (5 ').   19. Dispenser according to claim 17 wherein said side wall (20) of said body (2) comprises at least one groove or helical rib (28) cooperating with a complementary element (34) of said piston (3) at its periphery, and in which said central rod (4) is a smooth central rod (41) of non-circular section cooperating with a homothetic smooth nut (30 ") of said piston (3), so that a rotation of said central rod (4) causes a rotation of said piston (3) and thus its axial displacement.   20. Dispenser according to any one of claims 1 to 16 wherein the side wall (20) of said body (2), said piston (3) and the skirt (50) of said base (5) have non-circular homothetic sections, the bottom (51) of said base (5) comprising an opening for the passage of said button (5 ') of circular section.   21. Dispenser according to claim 20 wherein said central rod (4) is a threaded rod (40) cooperating with a threaded nut (30 ') of said piston (3).   22. Dispenser according to any one of claims 1 to 21 wherein said knob (5 ') cooperates with said body (2) or said base (5) to form a metering means (13) so as to dispense a predetermined dose or quantity of said product per rotation cycle, each time said knob (5 ') undergoes, relative to said body (2) or said base (5), an angular rotation co over a predetermined angular range e.   23. Dispenser according to claim 22 wherein said angular range 0 is equal to 360 / N, with N typically ranging from 1 to 10, and preferably from 2 to 6.   24. Dispenser according to any one of claims 22 to 23 wherein said metering means (13) is formed by cooperation of a single element said first (130) opposite N element (s) said (s) second (s) (131), so that any passage of said first element (130) facing a second element (131) during said rotation triggers a sensory signal, for example a sound signal or a pinging, or a tactile signal formed for example by a point of resistance to rotation, and preferably so that said dosing means also forms a means preventing a rearward rotation or a rear passage of said first element (130) facing a second element to (131).   25. Dispenser according to any one of claims 1 to 24 wherein said knob (5 ') cooperates with said body (2) or said base (5) so as to form a decompression means (14) of said product through axial displacement said knob (5 ') with respect to said body (2) or said base (5) during said rotation, an angular rotation w causing an axial displacement Z (w) of said base (5) relative to said body (2) , the maximum value ZM of said axial displacement typically ranging from 0.5 to 2 mm.   26. A dispenser according to claim 25 wherein said angular rotation w causes an axial displacement Z (w) of said button (5 ') relative to said body (2), by means of male elements (140) and female (141) which cooperate in rotation, said male element (140) typically comprising at least one radial pad (142) guided by said female element (141) formed for example by a circular guide ramp (143) formed of N elementary guide rails (144), typically N grooves, so that, for each cycle of rotation, said button (5 ') approaches first of said vault (21) passing from Zo to ZM, then departs sharply at the end of the cycle to return to Zo, so as to increase the volume of said cavity and thus, by dropping the internal pressure of said product in said cavity, and to avoid a complementary flow of said product through said orifice (22) at the end of said manual rotation said button (5 ').   27. Dispenser according to claim 26 wherein said male element or said radial stud (142) are integral with said knob (5 '), and said female element (141) or said guide ramp (143) are integral with said body (2). or said base (5).   28. Dispenser according to claim 26 wherein said male element or said radial stud (142) are integral with said body (2) or said base (5), and said female element (141) or said guide rail (143) are integral with said button (5 ').   A dispenser according to any one of claims 26 to 28 wherein said guide ramp (143) if N = 1, or said elementary guide rail (144) if N 1 comprises a first low slope portion (145) and a second portion (146) with a steep slope, said first portion (145) extending angularly at least 0.6.9, so that said decompression means also forms a means for preventing a rearward rotation of said knob (5 ' ).   The dispenser of claims 23 and 25 wherein said decompression means (14) forms said dosage means (13).   31. Dispenser according to any one of claims 1 to 30 wherein said piston (3) comprises, in addition to said nut (30, 30 ', 30 ") at its center, a peripheral skirt (31) with said body at its periphery, and a central plate (32) solidarisant said peripheral skirt (31) to said nut (30) and exerting an axial thrust on said product for its flow.   32. The dispenser of claim 31 wherein said nut (30, 30 ', 30 ") of said piston (3) comprises a flexible upper portion (300) for sealing between said piston (3) and said central rod ( 4), and a rigid lower portion (301) integral with said central plate (32), said flexible upper portion (300) having a small relative thickness and a small relative clearance with said central rod (4), said rigid lower portion (301 ) having a large relative thickness and a greater clearance with said central rod (4), so that each portion (301, 302) of said nut (30, 30 ', 30 ") provides a distinct function: sealing for said upper part (300), and the mechanical resistance to effort for said lower part (301).   33. Dispenser according to any one of claims 31 to 32 wherein said peripheral skirt (31) of said piston (3) comprises a flexible upper portion (310) for sealing between said piston (3) and said side wall (20). ) of said body (2), and a rigid lower portion (311) integral with said central plate (32), said flexible upper portion (310) having a small relative thickness and a small relative clearance with said side wall (20), said portion rigid bottom (311) having a large relative thickness and a greater clearance with said side wall (20), so as to obtain a seal of the piston (3) with respect to said side wall (20) without excessive friction between said sidewall (20) and said piston (3).   34. Dispenser according to any one of claims 21 to 33 wherein said threaded nut (30 ') of said piston (3), and typically said rigid lower part (301), abuts against said base (5), so as to allowing filling at the bottom of said body (2) provided with said cap (6), said body (2) being in the inverted position, then an assembly of an assembly comprising said base (5), said central rod (4), and said piston (3) cooperating with said rod, said assembly being typically an axial latching.   35. Dispenser according to any one of claims 1 to 34 wherein said skirt (50) of said base (5) or said button (5 ') forms a bottom wall (500) surrounding said side wall (20) of said body to its part lower part (23), and wherein said skirt (60) of said cap (6) forms an upper wall (600) surrounding said side wall (20) of said body (2) at its upper part (24), so that said upper (600) and lower (500) walls, of the same cross-section, meet at their end when said distributor (1) is closed.   36. A dispenser according to any one of claims 1 to 34 wherein said side wall (20) of said body (2) comprises an upper circular recess (25) and / or a lower circular recess (26), said recesses (25, 26). being typically external, so as to cooperate respectively with said skirt (60) of said cap (6) and with said skirt (50) of said base (5) or said knob (5 '), so that said distributor (1 ), closed, may possibly have a same cross section along its entire height, or in such a way that the skirt (60) of said cap (6) and the skirt (50) of said base are connected to said lateral wall (20) according to the same cross section.   37. Dispenser according to any one of claims 1 to 34 wherein said body (2) comprises an outer upper circular recess (25) cooperating with said skirt (60) of said cap (6), wherein said side wall (20) of said body comprises an inner lower circular recess (26 '), and wherein said skirt (50) of said base (5) or said knob (5') comprises, in whole or in part, an inner projection (501) cooperating with said recess lower interior (26 '), so that said distributor (1), closed, optionally has a constant cross section over its entire height.   38. Dispenser according to any one of claims 1 to 37 wherein said orifice (22) comprises a plurality of elementary orifices (222).   39. A dispenser according to any one of claims 1 to 38 wherein said central rod (4) and said knob (5 '), or said base (5), form a one-piece plastic molded part.   40. Dispenser according to claim 39 wherein said central rod (4) is a hollow rod (4 ').   41. A dispenser according to claim 40 wherein said hollow rod (4 ') comprises upper lateral openings (42) for loading or filling said product dispenser, and lower side openings (43) forming vents for the evacuation of the air during said filling, said hollow rod (4 ') forming an inner cavity (44) allowing the passage of a filling cannula (9), said cavity (44) being closed by a plug (45) after said filling .   42. A dispenser according to any one of claims 1 to 41 wherein said side wall (20) at its lower part (23) and said base (5), or said knob (5 ') cooperate by axial latching means ( 15), typically irreversible, after filling said cavity.   43. A dispenser according to any one of claims 1 to 42 wherein said side wall (20) at its upper part (24) and the skirt (60) of said cap (6) cooperate by axial latching means (17), typically reversible, so as to be able to close / open at will said distributor (1).   44. A dispenser according to any one of claims 1 to 43 wherein said cap (6) forms a molded part of a typically transparent thermoplastic material.   45. Dispenser according to any one of claims 1 to 44 wherein said cap (6) comprises a closure insert (66) for temporarily covering said vault (21) when said distributor (1) is closed, to form said means specific sealing (12) of said orifice (22).   46. Pot formed by the dispenser according to any one of claims 1 to 45 having a height H typically ranging from 40 mm to 80 mm, the pots of circular section having a mean diameter D on said height typically ranging from 30 mm to 80 mm, with an H / D ratio ranging from 0.5 to 2.   47. Pot according to claim 46 having a cross section or a constant diameter D over the entire height H. 48. Dispenser (1) for the conditioning of a fluid product, typically a fluid cosmetic product, comprising: a) a body (2) comprising a side wall (20) closed at its upper part (24) by a vault (21) ) having at least one orifice (22), forming a reservoir for containing said product, and open at its lower part (23), b) a piston (3) slidable in said side wall (20) for forming an internal cavity of variable volume for containing said product, axial displacement of said piston (3) in an axial direction (10) of said body (2) pushing said product through said orifice (22) for application to a support, toc) a central rod (4) oriented in said axial direction (10) and in a central axis of symmetry (10 '), said central rod (4) being integral with a propulsion button (5') forming typically a base (5), provided with a skirt (50) and a bottom (51), cooperating with said side wall (20) at its lower part (23) so as to close it, said central rod (4) cooperating with a central part or nut (30) of said piston (3), so as to form a propulsion means (11) said product, a manual rotation of said knob (5 ') causing said axial displacement of said piston (3), an axial thrust of said product towards said orifice (22) and a flow of said product through said orifice (22), d) and a cap (6) provided with a skirt (60) and a head (61), said skirt (60) being intended to cooperate with said body (2), typically with said side wall (20) at its part upper (24), so that said cap (6) temporarily covers said vault (21) when said distributor (1) is closed, characterized in that: 1) said orifice (22) has a surface So, such that the ratio So / Sc is less than 0.5.Sc being the surface of the outer section of said side wall (20) of said body (2 the surfaces So and Sc being measured in a plane perpendicular to said axial direction (10), 2) said body (2) and said base (5) cooperate to form a decompression means (14) of said product by means of an axial displacement of said base (5) relative to said body (2) during said rotation, an angular rotation w causing an axial displacement Z (w) of said base (5) relative to said body (2), the maximum value ZM of said axial displacement typically ranging from 0.5 to 2 mm.   49. Dispenser (1) for the conditioning of a fluid product, typically a fluid cosmetic product, comprising: a) a body (2) comprising a side wall (20) closed at its upper part (24) by a vault (21) ) having at least one orifice (22), forming a reservoir for containing said product, and open at its lower part (23), b) a piston (3) slidable in said side wall (20) to form a variable volume internal cavity for containing said product, an axial displacement of said piston (3) in an axial direction (10) of said body (2) pushing said product through said orifice (22) for application on a support , c) a central rod (4) oriented in said axial direction (10) and in a central axis of symmetry (10 '), said central rod (4) being integral with a propulsion button (5') forming a typically base (5), provided with a skirt (50) and a bottom (51), cooperating with said side wall (20) at its lower part (23) so as to close it, said central rod (4) cooperating with a central part or nut (30) of said piston (3), so as to form a propulsion means ( 11) of said product, a manual rotation of said knob (5 ') causing said axial displacement of said piston (3), an axial thrust of said product towards said orifice (22) and a flow of said product through said orifice (22), d) and a cap (6) provided with a skirt (60) and a head (61), said skirt (60) being intended to cooperate with said body (2), typically with said side wall (20) at its upper part (24), so that said cap (6) temporarily covers said vault (21) when said dispenser (1) is closed, characterized in that: 1) said orifice (22) has a surface So, such that the So / Sc ratio is less than 0.5.Sc being the surface of the outer section of said side wall (20) of said body (2), the surfaces So and Sc being measured in a plane perpendicular to said axial direction (10), 2) said central portion or nut (30, 30 ', 30 ") of said piston (3) comprises a flexible upper portion (300) for ensuring sealing between said piston (3) and said central rod (4), and a rigid lower portion (301) integral with said central plate (32), said flexible upper portion (300) having a small relative thickness and a small relative clearance with said central rod (4), said rigid lower part (301) having a large relative thickness and a greater clearance with said central rod (4), so that each part (301, 302) of said nut (30, 30 ', 30 ") provides a distinct function: the seal for said upper part (300), and the mechanical resistance to effort for said lower part (301).