EP0329582B1 - Dispenser for viscous products comprising an axial actuator for lateral dispensing and a screening element for the exit orifice - Google Patents

Abstract

The subject of the invention is a dispenser for viscous products comprising an actuator (101) provided with a dispensing duct (105) having a lateral exit, this actuator sliding longitudinally with respect to a guidance means (110) fixed with respect to the body of the dispenser, the said dispensing duct being connected in a sealed manner to the means of routing the viscous product to the said duct (105), and the said actuator (101) acting on an element with a spring effect producing its return to the released position and on a means of compression forming part of the said routing means. <??>This dispenser is characterised in that it comprises a screening element (113) which is fixed with respect to the body of the dispenser (116), this element leaving the exit orifice (116) of the dispensing duct (105) free when the actuator (101) is pushed in and screening this orifice (116) when the said actuator (101) is released. <??>The invention relates to dispensers in the cosmetic, hygienic, pharmaceutical and food areas. <IMAGE>

Description

The invention relates to a dispenser for pasty product comprising a pusher with lateral distribution, this pusher sliding in a rectilinear movement relative to one or more fixed guide means relative to the body of the dispenser.

Document DE-A-3,122,330 describes a dispenser of this type, the pusher of which is provided with a distribution duct with lateral outlet, this pusher sliding axially with respect to a fixed part of the dispenser and acting by pushing it in on a return spring as well as on means of conveying the pasty product. The outer tubular skirt of the dispenser head carries at its upper part an inclined portion serving as a sealed stop for the outlet orifice of the dispensing duct of the pusher when the latter is released. The dispenser head should point downward for dispensing the pasty product.

This inclined portion then masks the outlet orifice, but it has the disadvantage of not eliminating the remains of pasty product which can adhere to the distribution duct in the vicinity of its orifice and be then bothersome, that is to say that they prevent obtaining then pasty cords of regular shape, either that they lead to an unpleasant appearance, or that they prevent the cover from being easily replaced or excessively dirty it.

We also know from document US-A-3 680 738 a pressurized dispenser of product in aerosol form having the same structural characteristics as the previous dispenser. Its pusher slides with respect to its body and to its capsule, and moreover this capsule carries a lateral outlet orifice to the right of which opens the aerosol product duct when the pusher is pressed.
Masking of the opening of this conduit by the capsule is thus achieved when the pusher rises, but there is no elimination of the product which can be deposited at the outlet orifice.

The Applicant has sought to develop a dispenser for a pasty product which does not have the disadvantages of the dispenser known from DE-A-3 122 330.

STATEMENT OF THE INVENTION

The subject of the invention is a dispenser for product comprising, as is known from DE-A-3 122 330, a pusher provided with a distribution duct with lateral outlet, this pusher sliding longitudinally with respect to a fixed part of the dispenser and acting on a spring-effect return means as well as on the means for conveying the pasty product, said distributor comprising a element for masking the outlet orifice of said distribution duct in the released position of the pusher, this masking element being carried by an outer tubular part of the dispenser and leaving said orifice cleared when said pusher is pressed.

According to the invention, said pusher slides with respect to said outer tubular part of the dispenser, and the end surface surrounding said outlet orifice, as well as the surface of the masking element which is located opposite said surface of end when the pusher is released, are both parallel to the direction of sliding of the pusher, the masking element consequently cutting off the end of the pasty bead and scraping said end surface of the dispensing duct when the pusher is released , and said conveying means comprise a deformable tubular cup, tightly fixed to the body of the dispenser and to the pusher, this cup defining a compression chamber for the pasty product and constituting both the spring effect element and the means of compression on which the pusher acts by its depression and recalling this pusher in the released position.

The construction is simpler than in DE-A 3 122 300 and there cannot be any accumulation of pasty residues which are troublesome for the operation of the distributor. The product delivery by actuation of the pusher does not depend on the position of the dispenser.

The pusher preferably comprises a central portion comprising a bearing veil and a sliding exterior side wall and an outlet portion of the distribution duct projecting laterally from this sliding portion, this sliding side wall of the sliding plunger inside the exterior tubular part of the dispenser. Due to the parallelism of the end surface surrounding the outlet orifice and of the surface of the corresponding portion of the masking element in the direction of sliding of the pusher, the relaxation of the pusher results in masking by shearing movement, allowing the cutting of the end of the pasty bead and the scraping of the periphery of the orifice.

It can be noted that, when said surfaces which are parallel to one another make a small angle, in practice less than 10 °, with the sliding direction, there is also obtained a cutting effect of the pasty stream according to its viscosity.

The position of the masking element, which is part of said outer tubular part, as well as the geometry of the pusher, and more precisely the position of the end of its distribution duct and its tightening by said external lateral wall or wall sliding, are preferably such that the masking element is +0 to +0.4 mm from the end surface of the distribution duct, and preferably less than +0.3 mm from this surface, so as to obtain good protection of the dispensing orifice as well as, an effective scraping of said end surface of the conduit.
It is preferable to have, to improve the cutting of the pasty bead by the masking element, a thinning of the active edge of this element by means of an external chamfer, this active edge being that which first meets the pasty bead once the button is released.

The upper edge or free edge of the outer tubular part in which the pusher slides advantageously defines at least one level of support of the outlet portion projecting laterally from the pusher, thereby adjusting the dosage of pasty product.

The outer tubular part can also constitute a guide element by pushing in the plunger and more complete protection of its lateral outlet portion. It therefore preferably comprises a window the longitudinal edges of which limit the lateral or rotational movements of the pusher and the lower edge of which limits the penetration of the pusher, as well as a masking element in the form of a strip connected to the edges of the window by lateral cheeks and possibly overcome by a protective veil, this masking element in the form of a cap protecting the outlet portion of the dispensing conduit when the pusher is released.

• avec ladite coupelle déformable, une cheminée longitudinale portée par le dessous du voile d'appui du poussoir à laquelle est fixée de façon étanche une tubulure de sortie de ladite coupelle tubulaire déformable, une partie de ladite cheminée constituant le début du conduit de distribution ;
• l'extrémité de ladite tubulure de sortie de la coupelle tubulaire déformable formant, de préférence et de façon particulièrement avantageuse, avec le dessous du voile d'appui du poussoir la valve d'expulsion du produit pâteux depuis la chambre de compression vers ledit conduit de distribution du poussoir.

Deux structures remarquables de valves d'expulsion de ce type sont décrites dans les exemples.The dispenser of the invention preferably comprises, with its external tubular part for guiding the pusher, this tubular part most often carrying the masking element, the means for conveying the following complementary pasty product:

• with said deformable cup, a longitudinal chimney carried by the underside of the support veil of the pusher to which is tightly fixed an outlet pipe of said deformable tubular cup, a part of said chimney constituting the beginning of the distribution duct;
• the end of said outlet tube of the deformable tubular cup preferably forming, and in a particularly advantageous manner, with the underside of the support veil of the pusher the valve for expelling the pasty product from the compression chamber towards said conduit distribution of the pusher.

Two remarkable structures of such expulsion valves are described in the examples.

The position of the masking element of the invention can be set back enough not to prevent or hinder the penetration of a presentation and cleanliness cover: it can for example correspond to the diameter of the portion of the tubular part outside that comes to surround the end of the skirt of this cover.

Finally, when the masking element is in the form of a strip connected to the external tubular part by lateral cheeks, the outlet portion of the pusher distribution duct being at rest inserted in this U-shaped strip, the dispenser is advantageously returned inviolable by means of a plate connected by breakable bridges at the bottom of the cheeks side of the strip, this plate produced by molding said external tubular part preventing uncontrolled sinking of the pusher and making manifest the first use of the dispenser.

The examples will illustrate the embodiments and certain advantageous features of the dispenser of the invention.

EXAMPLES

Figure 1 shows the pusher and the tubular guide piece. a first preliminary test distributor, the pusher being depressed, in axial section passing through the axis of the distribution conduit.

FIG. 2 shows the pusher and the tubular guide piece of a second distributor, according to the invention, the pusher being pushed in, in section of the same type.

Figure 3 shows the same parts of Figure 2, in the released position of the pusher, according to the same section.

Figure 4 shows the same parts, seen from above.

FIG. 5 shows the top of a third distributor, according to the invention, the pusher being released, in axial half-section passing through the axis of the distribution duct.

Figure 6 shows the top of the second distributor according to the invention, before use, in axial half-section passing the axis of the distributor duct.

Figure 7 shows the top of the same dispenser, the pusher being pressed in the same section.

The pusher 1 of FIG. 1 comprises an upper veil 2 serving as a support and a circular cylindrical side wall 3 interrupted by the substantially radial emergence of the outlet portion 4 of the distribution conduit 5 of the pasty product. This duct 5 has an oval cross-section flattened on its lower 6 and upper 7 walls which are in their central parts perpendicular to the axis X of symmetry corresponding to the sliding direction of the pusher 1. In the part of the duct 5 which is internal at the side wall 3, its upper wall 7 coincides with the upper web 2 of the pusher 1. The duct 5 opens into a circular central cylindrical chimney 8 which, when assembled, is tightly fixed by the groove 9 on a deformable tubular cup of the type shown in FIG. 5 or of that of FIGS. 6 and 7.

The guide means to this pusher 1 is an outer tubular part 10 of the same axis X as the pusher 1, the upper portion 11 of this part 10 being circular cylindrical and having a diametral clearance of 0.2 mm relative to the side wall 3 of the pusher 1 which slides axially in this portion 10. This upper portion 11 comprises at the point of emergence of the outlet portion 4 of the pusher 1 a window 12 for passage of this outlet portion 4 surmounted by an element of fixed masking 13 in the form of a visor, the inner surface 14 of which is applied to the orifice 16 and on its periphery 17 in the released position of the pusher. This inner surface 14 and the surface of the periphery 17 of the orifice 16 are slightly curved, mutually parallel and inclined at about 25 ° relative to the axis X.
The masking element 13 has at its upper part a small horizontal flange 18 which completes the protection of the end of the conduit 5 in the released position of the pusher 1, and stops the ascent of this pusher 1 approximately 1 mm before its complete rise, so that the end 16 and 17 of the conduit 5 is, at rest, applied elastically against the masking element 13, thus achieving a tight closure. The upper edge of the masking element 13 is connected by two oblique edges 19 to the upper end edge 20 of the rear part of the sliding portion 11. This edge 20 is perpendicular to the axis X and is 0.5 1 mm below the support web 2 of the pusher 1 when it is depressed, so that the guidance of the pusher 1 remains good in this position. The sealing by simple elastic support which is carried out here is particularly advantageous for pasty products of fairly low or medium viscosity, whose adhesions of pasty product are limited.

• . diamètre intérieur cylindrique circulaire de la portion supérieure de coulissement 111 de la partie de guidage 110 = 22,2 mm
• . diamètre extérieur de la paroi latérale cylindrique circulaire 103 du poussoir 101 = 22,1 mm
• . dimension hors-tout du poussoir 101 selon le plan de coupe = 25,9 mm
• . distance entre les prolongements des surfaces intérieures 114 de l'élément de masquage 113 et de la portion de coulissement 111 qui lui est opposée, selon l'axe du conduit de distribution 105 = 26,0 mm.

In the dispenser of FIGS. 2 and 3, there is an important modification compared to the first dispenser: the periphery 117 of the orifice 116 of the duct 105 of the pusher 101 and the interior surface 114 of the masking element 113 are both parallel to the sliding direction X of the pusher 101. By comparing FIG. 2 (depressed position of the pusher 101) and FIG. 3 (released position of the pusher), it can be seen that when the pusher 101, subjected to the expansion of a spring-effect element which it has compressed by its depression, rises, its surface end 116 and 117 moves in a shearing movement with respect to the surface 114 of the masking element. The pusher 101 and the outer tubular guide part 110 are both made of molded polypropylene, with thicknesses of 1 to 1.2 mm for the parts playing a role in the positioning, and have the following dimensions according to the cutting plane:

• . circular cylindrical inner diameter of the upper sliding portion 111 of the guide portion 110 = 22.2 mm
• . outer diameter of the circular cylindrical side wall 103 of the pusher 101 = 22.1 mm
• . overall dimension of pusher 101 according to the cutting plane = 25.9 mm
• . distance between the extensions of the interior surfaces 114 of the masking element 113 and of the sliding portion 111 which is opposite to it, along the axis of the distribution duct 105 = 26.0 mm.

It was found that with this arrangement, the internal elements in relation to the movement of the pusher being represented in FIGS. 6 and 7, very good shearing of the ends of the fairly viscous pasty bead was obtained and a scraping of the orifice 116 and of its periphery 117, making it possible to avoid the drawbacks linked to the drying and hardening of the pasty residues projecting from the orifice 116 or adhering to its periphery 117.

To obtain such results, the following conditions are typically observed: diametral sliding play of the pusher 101 in the sliding portion 111 of the guide portion 110 = 0.2 mm maximum; and play between the pusher 101 and the guide part 110 at the end 117 of the distribution conduit 105 and the masking element 113 = less than 0.3 mm.
The lower edge of the masking element 113 is thinned by an external chamfer 1132, which generally improves the shearing of the ends of fairly viscous pasty bead.

In FIG. 4 (top view), it can be seen that the upper web 102 of the pusher 101 has slight rounded chamfers such as 1020. The pusher 101 is embedded with a small clearance in the external tubular part 110, clearance of 0.1 mm in diameter for the circular cylindrical zones and, in the released position of the pusher 0.3 to 0.4 mm between the outlet portion 104 and the side cheeks 1130 of the masking element 113. Beyond the side cheeks 1130, the upper edge of the outer part 110 is continued by two oblique edges 119 (FIGS. 2 and 4) which connect a little beyond the half-circumference to its rear part 120 perpendicular to the sliding axis X, which gives a good compromise between the ease of support of the pusher 101 by the user and the rigidity of its guidance during its ascent. More specifically, the rear upper edge 120 here extends, between the connection points 1190, over 140 ° and it is in practice desirable for this extent to remain between 100 and 160 °. The front external surface 1131 of the masking element 113 overhangs the circular cylindrical part 121 around which the protective cover (see FIG. 6) must adjust, it is plumb or slightly set back from this cylindrical surface 121 so as not to hinder the installation of this cover.

FIG. 5 shows the top of a third distributor equipped with a deformable tubular cup 22 in polyester-ether, fixed in the central chimney 8 of the pusher 201 by its upper tubular 23 whose outer rib 230 is snapped into the inner groove 9 from the bottom of this chimney 8.

This third distributor has the same tubular guide piece 110 as the second distributor, and the pusher 201 is identical to the pusher 101 with the exception of the bottom of the chimney 8 which is smooth whereas in the second distributor it comprises (FIG. 3 by example) a small axial tubular 124. The upper tubing 23 of its deformable cup 22 ends in a tapered flexible flexible lip 230 of thickness 0.2 mm at its end, which is applied elastically in leaktight manner against the bottom of the chimney 8, that is to say against the bottom surface of the support web 202. The deformable cup 22 comprises below the upper tube 23 a deformable web 24 in the form of a thinned dome with a thickness of 0.9 mm, then a semi-rigid lower tube 25 and a lower flange 26 for fixing between the bottom of the guide piece 110 and the top 27 of the tubular body 28 of the dispenser. The deformable cup 22 delimits a compression chamber 29, the suction valve of which is not shown in FIG. 5 but is identical to that of the second distributor (FIGS. 6 and 7), and the product expulsion valve of which pasty in the distribution conduit 205 is formed by the elastic lip 230 and by the top of the support veil 202 which is also the wall of the conduit 205. This arrangement gives particularly reliable guidance and ascent of the pusher 201, resulting in a good reproducibility of the effects of the masking element 113: shearing of fairly viscous pasty beads, scraping of the end orifice of the distribution conduit 205 and its periphery, sealing of this orifice with little play.

Figures 6 and 7 show the top of the second distributor, respectively before the first use and in use, the pusher 101 is then pressed. For storage and sale, the masking element 113, which does not have an upper rim so as to allow the introduction of the pusher 101 from the top of the tubular guide element 110 during assembly of the dispenser , is provided at its lower part, below the outlet portion 104 of the distribution duct 105 of the pusher 101 in the relaxed state, with a plate 30 connected to the bottom of the side cheeks such as 1130 (FIG. 4) by breakable bridges. A protective and presentation cover 31 is in place, without obstacles coming from the masking element 113 as has been commented on in connection with FIG. 4. After removal of the cover 31, it will suffice to depress the pusher 101 of 1 , 5 to 2 mm to obtain the rupture of the breakable bridges and the fall of the tamper-evident plate 30, while the maximum insertion of the pusher 101 (position of FIG. 7) is 9 mm.

The pusher 101 is fixed to a deformable tubular cup 32, of which only the upper end of the upper tube 33 differs from the upper end 230 of the upper tube 23 of the cup 22 of the second distributor. This upper end 33 comprises an annular end edge 34 and a flexible disc 35 the periphery of which is held in abutment on the edge 34 by the support of the axial tube 124, the disk carrying an axial centering rod 36 which fits into the tube axial 124, which ensures good centering of this flexible element 35 which forms with the annular edge 34 the expulsion valve 34 and 35 of the dispenser.

In addition, which is advantageous for assembly, the underside of the flexible disc 35 is connected to the interior of the upper tube 33 by three flexible rods 37 spaced at 120 °, of cross section 1 x 0.6 mm. The thickness of the flexible disk is, outside its central zone, 0.3 mm. In itself, this expulsion valve 34 and 35, produced here in one piece with the rest of the deformable tubular cup 32, allows passage of pasty product easier than the expulsion valve of FIG. 4 and a faster rise pusher 101, which promotes cutting and scraping by the masking element 113. Results will be indicated below.

The second, like the third distributor, comprises (FIGS. 6 and 7) at the base of the compression chamber 38 delimited by the deformable cup 32 a valve 39 and 40 for suction of the pasty product contained in the storage chamber surmounting a piston sliding bottom (not shown) in said compression chamber 38, this aspiration taking place here in substantially radial directions represented in FIG. 6 by arrow 41. The top of the tubular body comprises a transverse partition 42 separating the storage chamber from the compression chamber 38, and this partition 42 comprises a passage orifice 43 of 22 mm diameter surrounded by an annular surface 39 constituting the seat of the suction valve 39 and 40, the valve 40 of this valve comprising an upper web protruding 44, the annular rim of which is applied in sealed manner to the annular surface 39 in the valve closed position (FIG. 7), and a sub-portion adjacent provided at its lower part with one or more retaining reliefs of overall diameter greater than 0.4 to 2 mm to the diameter of said passage orifice 43, this overall diameter allowing the initial clipping of the valve 40 through from this hole. In the present case, the underlying portion has 12 reliefs radial spaces such as 45 and 45 ', whose longitudinal edges such as 46, with an overall diameter of 21 mm, serve as means for guiding the valve 40 in the orifice 43, as well as a retaining ring 47 of circular outline , supported by the reliefs 45. The closing veil 44 of the valve 40 has a central hollow area 48, the underside of this area 48 being at an intermediate height of the pasty product passage windows delimited by the annular edge of the veil 44 , the reliefs such as 45 and 45 ′, and the circular rod 47, which facilitates the passage of the pasty product through the valve 40 while allowing more pronounced crushing of the pumping element 32 (Figure 7). The axial stroke of the valve 40 of the orifice 43 is 3 mm.

During the tests which were made, it was found that the arrangement of the expulsion valve 34 and 35 of the second distributor was significantly better than that of the expulsion valve 230 and 202 of the third distributor, the effort of expulsion, identified by the effort on the pusher necessary to obtain the distribution of the pasty product, passing from more than 4 kg to approximately 2.5 kg, and the energy available for cutting or scraping pasty debris being greater. It has also been determined that the arrangement of the valve 40, facilitating the passage of the pasty product by reducing the suction energy, would make it possible to keep the lift time of the pusher low when the thickness of the deformable veil 48 of the cup was reduced. deformable tubular 32 so as to further reduce the force required on the pusher 101. The combination of the two arrangements is thus particularly advantageous, in particular for the proper use of the masking element of the invention in its scraping functions and cutting debris or ends of pasty product.
The deformable tubular cup is preferably made from one of the materials of the group formed by: Thermoplastic polymers, silicone resins, rubbers. The suction valve, typically made of medium or high density PE or PP, is advantageously, and this is the case here, made in one piece and at the same time as the top of the tubular body, the lower part of its underlying portion. 44 below its retaining reliefs 45 being connected to the edge of the passage orifice 43 by a frangible peripheral film, the breaking of this connection and the snapping of the reliefs 45 then taking place in the same push.

The invention finds its application in distributors of pasty products or creams in the cosmetological, hygienic, pharmaceutical and food fields.

Claims (10)

1. A distributor for pasty material comprising a pushbutton member (101; 201) provided with a distribution conduit (105; 205) with a lateral outlet, the pushbutton member (101; 201) being longitudinally slidable with respect to a fixed part (110) of said distributor and acting on a spring-action return means (22; 32) and on the means (22, 230 and 202; 32, 34 and 35) for passing the flow of pasty material, said distributor comprising an element (113) for masking the outlet orifice (116) of said distribution conduit (105; 205) in the released position of the pushbutton member (101; 201), said masking element (113) being carried by an external tubular part (110) of the distributor and leaving said orifice (116) open when said pushbutton member (101; 201) is depressed, characterised in that said pushbutton member (101; 201) is slidable with respect to said external tubular part (110) of the distributor, the end surface (117) surrounding said outlet orifice (116) of said conduit (105; 205) and the surface (114) of the masking element (113) which is disposed facing said end surface (117) when the pushbutton member (101; 201) is released both being parallel to the direction of sliding movement (X) of the pushbutton member, the masking element (113) then cutting the end of the strand of pasty material and scraping said end surface (116 and 117) of the distribution conduit (105; 205) when the pushbutton member (101; 201) is released and that said means for passing the flow comprise a deformable tubular cup (22, 32) sealingly fixed to the body of the distributor and to the pushbutton member (101, 201), said cup (22, 32) delimiting a compression chamber (29, 38) for the pasty material and forming both the spring-action element and the compression means on which the pushbutton member (101, 201) acts by virtue of the depression movement thereof, and returning the pushbutton member to the released position.
2. A distributor according to claim 1 characterised in that the position of said masking element (113), the geometry of the pushbutton member (101; 201) and the gripping thereof by said external tubular part (110) are such that said masking element (113) is at a spacing from the end surface (116 and 117) of the distribution conduit (105, 205), which is between +0 and +0.4 mm.
3. A distributor according to claim 1 characterised in that said portion (104) of the masking element (113) has an edge which is reduced in thickness by an external chamfer (1132), at the side of engagement of said end surface (116 and 117) of the distribution conduit (105, 205) when the pushbutton member (101, 201) is released.
4. A distributor according to any one of claims 1 to 3 characterised in that the free edge of said external tubular part (10, 110) defines at least one level of support in respect of the outlet portion (4, 104) of the pushbutton member (1, 101, 201), thus regulating the metering effect in respect of pasty material.
5. A distributor according to any one of claims 1 to 3 characterised in that the external tubular part (110) comprises an opening whose longitudinal edges limit the lateral or rotational movements of the pushbutton member (101, 201) and the lower edge of which limits the depression movement (101, 201) of the pushbutton member, said masking element (113) being in the form of a band which is connected to the edges of said opening by side wall portions (1130).
6. A distributor according to claim 5 characterised in that the masking element (113) is provided with a plate portion (30) connected to the bottoms of its side wall portions (1130) by breakable bridges so as to prevent an unchecked depression movement of the pushbutton member (101) and clearly to indicate first use of the distributor.
7. A distributor according to any one of claims 1 to 6 characterised in that the underside of the contact wall portion (102; 202) of the pushbutton member (101; 201) carries a longitudinal sleeve (18) to which an outlet tube portion (22, 23) of said deformable tubular cup (22, 32) is sealingly fixed, a part of said sleeve (8) forming the beginning of said distribution conduit (105, 205) of the pushbutton member (101, 201), and the end (230, 34 and 35) of said outlet tube portion (23, 33) of the deformable tubular cup (22, 32) forming with the underside of the contact wall portion (202, 124) of the pushbutton member (201, 101) a valve (230 and 202; 34 and 35) for expulsion of the pasty material into said distribution conduit (105, 205).
8. A distributor according to claim 7 characterised in that said end of said tube portion (33) of the deformable tubular cup comprises an annular end edge (34) and that said expulsion valve (34, 35) comprises a flexible disc (35), the periphery of which is held in contact against said end edge (34) of the tube portion (33) by a means (36) for centrally bearing against said disc (35), which is itself held by the pushbutton member (101), said flexible disc (35) and said end edge (34) of the tube portion (33) respectively forming the valve member (35) and the seat (34) of said expulsion valve (34 and 35).
9. A distributor according to claim 8 wherein said flexible disc (35) and its central bearing means (36) are in one piece with said deformable tubular cup (32), the underside of the flexible disc (35) being connected to the interior of said tube portion (33) of said cup (32) by flexible connecting means (37).
10. A distributor according to any one of claims 1 to 9, characterised inthat the means (22, 230 and 202; 32, 34 and 35; 39 and 40) for carrying the flow of pasty material also comprise a bottom piston slidable within the body of the distributor and an intake valve (39 and 40) carried by a transverse partition (42) of said body, said partition (42) separating the chamber for storage of the pasty material from said compression chamber (38) comprising an orifice (43) for the pasty material to flow therethrough into the compression chamber (38), the valve member (40) of said intake valve being formed by an upper wall portion (44) of which the annular edge portion sealingly bears against the periphery (39) of said flow orifice (43) in the position of closure of the intake valve (39 and 40) and the subjacent portion (44) of said intake valve which is engaged into said flow orifice (43) being provided in its lower part with one or more raised retaining portions (45, 45′) of an overall diameter which is from 0. 4 to 2 mm larger than the diameter of said flow orifice.

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