Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D83/00—Containers or packages with special means for dispensing contents
  • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container
  • B65D83/0011—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container moved by a screw-shaft
• • A—HUMAN NECESSITIES
  • A45—HAND OR TRAVELLING ARTICLES
  • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
  • A45D40/00—Casings or accessories specially adapted for storing or handling solid or pasty toiletry or cosmetic substances, e.g. shaving soaps or lipsticks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D83/00—Containers or packages with special means for dispensing contents

Definitions

• Piston for cosmetic dispenser for cosmetic dispenser, cosmetic product dispenser and method of assembling such a dispenser
• the invention relates to a dispenser for cosmetic, hygienic or pharmaceutical products with a piston.
• Distributors of cosmetic, hygienic or pharmaceutical products comprising a piston sliding inside a cylinder head defining a volume for housing the product.
• the translational movement of the pistoa in the cylinder head allows the product to be discharged through a nozzle or an orifice at the end of the cylinder head.
• Different types of mechanisms can be used to drive the piston.
• the mounting of the piston on the threaded rod requires a screwing operation which proves to be restrictive if one wishes to carry out an automated assembly.
• part of the thread of the rod is only used during assembly and proves to be mutile during subsequent use to dispense the product.
• the invention therefore aims to facilitate the assembly of a dispenser of cosmetic-hygienic or pharmaceutical products. More particularly, the invention aims to simplify the mounting of a distributor of the piston and threaded rod type and to reduce the cost thereof.
• the subject of the invention is a piston for a dispenser of cosmetic, hygienic or pharmaceutical product, comprising: - a piston body defining a geometric axis; - A first threaded part comprising a first internal threaded sector, the first threaded part being movable relative to the piston body from a mounting position to an operational position; and a second threaded part comprising a second internal threaded sector which, when the first threaded part is in the operational position, forms with the first threaded sector an internal thread resulting axially, the first threaded part in the mounting position being positioned at a distance from the second threaded part.
• the piston In the mounting position, it is possible to position the piston relative to a threaded rod intended to come into engagement with the resulting internal thread without going through a step of screwing the piston onto the threaded rod or with a reduced screwing step. Passing from the mounting position to the operational position, the first threaded part closes on the threaded rod and engages with the latter. This also makes it possible to shorten the thread of the threaded rod.
• the resulting thread can be continuous and form a complete helix, or alternatively consist of two sectors of the same helix, provided that the resulting thread allows the screwing of a threaded rod. Any suitable means can be used to ensure the mobility of the first threaded part relative to the piston body.
• deformable connecting members integrally formed with the piston body and connecting the latter with the first threaded part.
• the movement from the mounting position to the operational position comprises a component of rotation about an axis of rotation which can be oriented in any way relative to the axis of the piston.
• the first threaded part is connected to the piston body by a hinge allowing the first threaded part to pass from the mounting position to the operational position.
• the piston body, the first threaded part, the second threaded part and the hinge form a one-piece plastic assembly, the hinge comprising at least one deformable connecting tab. The deformation of the tab can be elastic or not.
• Maintaining the first threaded portion in the operational position can be ensured by various means.
• the blocking in the operational position is obtained by cooperation of the first threaded part with a part of the distributor in which the piston is integrated.
• the first threaded part is provided with a guide surface for cooperating with a cylindrical cylinder head of the distributor so as to maintain the first threaded part in the operational position.
• the second threaded part can be fixed relative to the piston body.
• the second threaded part is movable relative to the piston body from a mounting position to an operational position, the second threaded sector forming with the first threaded sector said internal thread resulting axially when the first threaded part and the second threaded part are in the operational position, the second threaded part in the mounting position being located at a distance from the first threaded part.
• the piston body forms a closed tubular sheath and is provided with a peripheral crown projecting radially relative to the tubular sheath.
• the sheath is used to house the threaded rod so that the latter does not come into contact with the product to be dispensed.
• a cosmetic, hygienic or pharmaceutical product dispenser comprising: - a cylindrical cylinder head defining a geometric axis and a volume for housing the product; a threaded axial rod movable in rotation relative to the cylinder head about the geometric axis; and a piston comprising: - a lice piston body cooperating radially with the cylindrical cylinder head; - A first threaded part comprising a first internal threaded sector, the first threaded part being movable relative to the piston body between a mounting position and an operational position; a second threaded part comprising a second internal threaded sector which, when the first threaded part is in the operational position, forms with the first internal threaded sector a resulting internal thread cooperating with the threaded rod, the first threaded part in the mounting position being positioned away from the second threaded part so that it is possible to position the threaded rod relative to the piston body without the first threaded part being engaged
• the piston has, if necessary, all or part of the characteristics described above.
• the piston body forms a tubular sheath to house the threaded rod and separate the threaded rod from the product housing volume, and is provided with a peripheral crown projecting radially from the tubular sheath to cooperate with the cylinder head.
• the first threaded part in the operational position and the second threaded part in the operational position to be on an axial side of the piston body opposite the product housing volume.
• a third aspect of the invention also relates to a method of assembling a cosmetic, hygienic or pharmaceutical product dispenser provided with a piston as described above, the method comprising: - a first step in which has a threaded rod between the first threaded portion in the mounting position and the second threaded portion; - A second step in which the first threaded part is positioned in the operational position so that the threaded rod finds itself in engagement with the first threaded sector and the second threaded sector.
• the method further comprises a third step in which the piston is positioned in a cylinder head in such a way that the piston body cooperates radially with the cylindrical cylinder head and that the cylinder head maintains the first threaded part in the operational position.
• a fourth aspect of the invention also relates to a method of assembling a cosmetic, hygienic or pharmaceutical product dispenser provided with a piston, the second threaded part of which is movable relative to the piston body.
• the method comprising: - a first step in which a threaded rod is inserted in translation between the first threaded part in the mounting position and the second threaded part in the mounting position; - A second step in which the first threaded part and the second threaded part are positioned in the operational position so that the threaded rod finds itself in engagement with the first threaded sector and the second threaded sector.
• the method further comprises a third step in which the piston is positioned in a cylinder head in such a way that the piston body cooperates radially with the cylindrical cylinder head and that the cylinder head maintains the first threaded part and the second threaded part in operational position.
• FIG. 1 shows a perspective view of a piston according to the invention, provided with threaded parts shown in an installation position;
• FIG. 1 shows the piston of Figure 1, the threaded parts being in an operational position
• FIGS. 3A to 3G represent different successive stages of a method of assembling a dispenser for a cosmetic, hygienic or pharmaceutical product comprising the piston of FIG. 1.
• a one-piece plastic piston 10 obtained by injection molding is formed of a piston body 12 connected by deformable connecting lugs 14A, 14B to two threaded parts 16A, 16B.
• the piston body 12, which defines a geometric reference axis 17, comprises a tubular sheath 18 closed at one end and a peripheral crown 20 projecting radially relative to the tubular sheath 18.
• the threaded parts 16 A, 16B and the sheath 18 are located axially on either side of the peripheral ring 20.
• the sleeve 18 is provided with one or more rib 22 projecting radially and extending axially over all or part of the length of the sleeve.
• the deformable connecting lugs 14A, 14B constitute hinges which allow the threaded parts 16A, 16B to be folded down from a mounting position shown in FIG. 1 to an operational position shown in FIG. 2.
• the threaded parts 16A, 16B are provided radial guide surfaces 25 as well as complementary threaded sectors 22 A, 22B which, in the operational position, form a continuous axial thread passing through 26.
• FIGS. 3 A to 3D represent steps of a method for assembling a dispenser for a cosmetic, hygienic or pharmaceutical product comprising the monobloc piston of FIG. 1.
• the distributor comprises (in FIG. 3 G), in addition to the monobloc piston, a threaded rod 30, a tubular cylinder head 32 closed by and a nozzle 33 provided with an orifice for discharging the product and a cap 34.
• the threaded rod 30 is provided with a thread 36 and a flared head 40 having a radial circular groove 42.
• the cylinder head 32 has a lower part 44 provided with at least one groove 46 intended to cooperate with the rib 22 of the piston monoblock and an upper part 48 forming a cylindrical inner wall 50 to ensure the sliding of the piston 10.
• This cylindrical wall 50 is extended by a tapered end part 52 provided with a circular bead 54 projecting radially inwards to the diameter of the cylindrical wall, to cooperate with the radial circular groove 42 of the head 40 of the threaded rod.
• the threaded rod 30 is presented in the axis 17 of the sleeve, the threaded parts 16A, 16B being in the mounting position ( Figure 3 A).
• the threaded rod 30 is inserted into the sheath 18 by simple translation along the axis 17 (FIG. 3B), then the threaded parts 16 A, 16B are folded down (FIG. 3C) so that the threaded sectors 22 A, 22B come engaged with thread 36 of the threaded rod ( Figure 3D). It is then possible, if necessary, to perfect the positioning of the threaded rod by screwing it into the thread 26 of the piston until the head 40 of the threaded rod abuts against the piston 10 (FIG. 3E), which allows also to maintain the threaded portions 16A, 16B in the operational position in the following steps of assembling the dispenser.
• the cap 34 is then fitted on the flared part 40 of the threaded rod, so that the threaded rod 30 and the cap 34 are integral in rotation and in translation (FIG. 3F).
• the sub-assembly formed by the threaded rod 30, the cap 34 and the piston 10 constitutes a mechanism which is then mounted on the cylinder head 32 (FIG. 3 G), so that the end bead 54 of the cylinder head is inserted in the circular groove 42 of the head, preventing any translational movement between the two sub-assemblies, but allowing the relative rotational movements.
• the peripheral crown 20 of the piston is then in contact with the cylindrical wall 50 of the cylinder head and provides a seal for the product.
• the guide surfaces 25 cooperate with the cylindrical wall 50 to prevent the threaded parts 16A, 16B from leaving their operational position.
• the volume 60 can then be filled with the product to be dispensed, before fitting the end piece 33.
• the volume located between the piston 10 and the free end of the cylinder head 32 constitutes a volume 60 for housing the product, which it it is possible to fill before closing the free end of the cylinder head with the nozzle fitted with the product discharge orifice.
• the cap 34 drives the threaded rod 30 to which it is secured.
• the piston 10, the rib 22 of which is engaged in the groove 46 of the cylinder head, cannot rotate.
• the forces exerted by the threaded rod 30 on the thread 26 of the piston then impose a translational movement of the piston 10 relative to the rod 30 and to the cylinder head 32, and the product is discharged through the orifice of the nozzle 33.
• the same principle of mounting the piston on the threaded rod can be used for a mechanism for distributing a solid or pasty product, such as for example a lipstick grape.
• the piston does not have to ensure sealing between the product housing volume and the mechanism, but exerts a function of supporting the solid product and guiding with respect to the walls of the cylinder head.
• the cap does not necessarily cover the cylinder head.
• the threaded rod can be guided in rotation about its axis and fixed in translation relative to the cylinder head by any suitable means.
• the guiding in translation between the piston and the cylinder head, which prohibits rotation of the piston relative to the cylinder head, can be ensured by any means.
• the piston and the cylinder head may have a non-circular section, so that the groove and rib guide can be eliminated if necessary.
• the piston sleeve which constitutes a separation between the product and the threaded rod, can be removed if the product is solid or if it is possible to achieve a sufficient seal at the thread. This will be particularly the case when the product has a high viscosity or is made up of a sufficiently large grain powder.
• the two threaded parts are joined to one another along an axial plane.
• the junction surface of the two threaded parts can be different, for example along two axial half-planes delimiting an angular sector.
• the thread 26 constituted by the threaded sectors 22A, 22B may not be complete but on the contrary formed by two opposite threaded sectors, provided that the resulting thread effectively allows cooperation with the external thread of the rod.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Closures For Containers (AREA)
• Coating Apparatus (AREA)
• Basic Packing Technique (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34896607

Family Applications (1)

Country Status (11)

Families Citing this family (2)

Family Cites Families (8)

• 2004
  • 2004-03-17 FR FR0402780A patent/FR2867760B1/fr not_active Expired - Lifetime
• 2005
  • 2005-03-03 JP JP2007503365A patent/JP2007529370A/ja not_active Withdrawn
  • 2005-03-03 EP EP05732605A patent/EP1737757A1/fr not_active Withdrawn
  • 2005-03-03 BR BRPI0508175-0A patent/BRPI0508175A/pt not_active Application Discontinuation
  • 2005-03-03 WO PCT/FR2005/000504 patent/WO2005100202A1/fr not_active Application Discontinuation
  • 2005-03-03 CA CA002559199A patent/CA2559199A1/fr not_active Abandoned
  • 2005-03-03 KR KR1020067018692A patent/KR20070003929A/ko not_active Application Discontinuation
  • 2005-03-03 MX MXPA06010627A patent/MXPA06010627A/es not_active Application Discontinuation
  • 2005-03-03 RU RU2006132685/12A patent/RU2006132685A/ru unknown
  • 2005-03-03 CN CNA2005800082674A patent/CN1930052A/zh active Pending
• 2006
  • 2006-09-14 US US11/521,096 patent/US20070062978A1/en not_active Abandoned

Non-Patent Citations (1)

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