Assembly for packaging two cosmetic products

Abstract

Assembly for packaging two products separately and for dispensing a mixture of said products upon first use, said assembly comprising a lower container, an upper container, a temporary closure member configured to close the lower container before first use, and comprising an internal thread that cooperates with an external thread provided on the lower container. The assembly comprises an assembly collar snap-fastened onto the lower container and onto the upper container, and rotating as one with the upper container and being rotatable with respect to the lower container. The temporary closure member is in sealing contact with the assembly collar before first use. Said temporary closure member comprises means for preventing the relative rotation of the temporary closure member and of the assembly collar and does not have means for axial retention with the containers and the collar.

1 . Assembly for packaging two products separately and for dispensing a mixture of said products upon first use, said assembly comprising:
 a lower container delimiting a first internal volume containing a first product;   an upper container delimiting a second internal volume containing a second product, said containers being rotatable with respect to one another without moving axially with respect to one another;   a temporary closure member configured to close an open end of the lower container before first use, and comprising:   an internal cylindrical skirt surrounding said open end; and
 a closing element connected to said internal cylindrical skirt, said skirt being provided, on its internal surface, with an internal thread that cooperates with an external thread provided on the lower container; and 
   an assembly collar snap-fastened onto the lower container and onto the upper container, said collar rotating as one with the upper container and being rotatable with respect to the lower container,   wherein, before first use, the temporary closure member is in scaling contact with the assembly collar, said temporary closure member further comprising first rotation prevention means cooperating with second rotation prevention means provided on the assembly collar so as to prevent the relative rotation of the temporary closure member and of the assembly collar and the temporary closure member not having means for axial retention with the containers and the collar, such that when the lower container is rotated with respect to the upper container, the temporary closure member is moved axially until it is located in the internal volume of the upper container.   
     
     
         2 . The Assembly according to  claim 1 , wherein the assembly collar comprises an internal skirt disposed radially between the open end of the lower container and a lower end of the upper container, said internal skirt comprising, on its internal surface, a snap-fastening bulge intended to be snap-fastened over an annular rib provided on the lower container. 
     
     
         3 . The Assembly according to  claim 2 , wherein the internal skirt of the assembly collar also comprises, on its internal surface, a sealing lip protruding towards the open end of the lower container. 
     
     
         4 . The Assembly according to  claim 2 , wherein the internal skirt of the assembly collar comprises a groove that cooperates, in a preassembled intermediate position, with a snap-fastening bead carried by the temporary closure member. 
     
     
         5 . The Assembly according to  claim 4 , wherein the temporary closing member also comprises an intermediate cylindrical skirt radially surrounding the internal cylindrical skirt at least partially and comprising the snap-fastening bead ( 36   a ) that protrudes outwards and cooperates with the groove in the collar. 
     
     
         6 . The Assembly according to  claim 5 , wherein the internal skirt of the assembly collar is disposed radially between an external cylindrical skirt of the temporary closure member and the intermediate cylindrical skirt of said member. 
     
     
         7 . The Assembly according to any one of claim , wherein the assembly collar comprises an external skirt radially surrounding the internal skirt and the lower end of the lower container, said external skirt comprising, on its internal surface, at least one snap-fastening protrusion protruding radially towards the internal skirt and cooperating with a snap-fastening protrusion provided on the external surface of the lower end of the upper container. 
     
     
         8 . The Assembly according to  claim 7 , wherein the external skirt comprises, on its internal surface, at least one rotation prevention protrusion cooperating with at least one notch provided in the external surface of the lower end of the upper container. 
     
     
         9 . The Assembly according to  claim 6 , wherein the first rotation prevention means are at least one notch formed in the external skirt of the temporary closure member and wherein the second rotation prevention means are formed by at least one longitudinal rib provided on the external surface of the internal skirt of the assembly collar. 
     
     
         10 . The Assembly according to  claim 1 , wherein the lower surface of the closing element comprises an annular sealing lip having an outside diameter substantially equal to the inside diameter of the open end of the lower container in order to be inserted into said open end. 
     
     
         11 . The Assembly according to  claim 1 , wherein the assembly collar comprises first angular limiting means cooperating with second angular limiting means ( 12   e ) provided on the lower container in order to limit the angular rotation of said lower container with respect to said collar, in particular to an angular range of around 180°. 
     
     
         12 . The Assembly according to  claim 1 , wherein the closure member comprises at least one indexing member configured to allow it to be positioned angularly on the lower container. 
     
     
         13 . The Assembly according to  claim 1 , comprising a device for application of said product mounted on the upper container. 
     
     
         14 . The Assembly according to  claim 1 , wherein the body of the lower container is made of rigid synthetic material and the body of the upper container is made of elastic synthetic material that is more flexible than the body of the lower container, so as to eject product contained in the internal receiving volume ( 14   a ) simply by pressing on the body of the upper container. 
     
     
         15 . Method for assembling an assembly according to  claim 1 , comprising the following steps:
 pre-assembling the temporary closure member and the assembly collar in an intermediate position in which the temporary closure member is snap-fastened in the assembly collar,   screwing the temporary closure member onto the open end ( 12   c ) of the lower container,   axially moving the assembly collar with the lower container until it is snap-fastened to the lower container, said axial movement of the assembly collar reversing the snap-fastening of the temporary closure member and the assembly collar, and   axially moving the upper container towards the assembly collar until it is snap-fastened to said collar.   
     
     
         16 . The method according to  claim 15 , wherein the respective axial movements of the assembly collar and of the upper container are carried out simultaneously. 
     
     
         17 . Method for using an assembly according to  claim 1 , wherein the rotation of the lower container is actuated, this causing the axial movement of the temporary closure member towards the upper container until the temporary closure member has been completely unscrewed with respect to the neck of the lower container, the internal volume of the upper container then being in fluidic communication with the internal volume of the lower container.