Method for making a cup unit of a lipstick container

Abstract

A method for making a lipstick cup unit of a lipstick container. The method includes the step of providing a cup with a chamber, a wall extending around the chamber, and an aperture extending throughout the wall so that the aperture is in communication with the chamber. A rivet is provided with a head and a slender portion. The slender portion includes a first end connected to the head and a second end located opposite to the first end. The second end of the slender portion is enlarged so that the enlarged second end of the slender portion is tightly located against an internal side of the wall and that the head is tightly located against an external side of the wall. The head is insertable in helical slit of a cylinder of the lipstick container and a rectilinear slit of another cylinder of the lips stick container.

1 . A method for making a lipstick cup unit of a lipstick container, comprising the steps of:
 providing a cup with a chamber, a wall extending around the chamber, and an aperture extending throughout the wall so that the aperture is in communication with the chamber;   providing a rivet with a head and a slender portion, wherein the slender portion is formed with a first end connected to the head and a second end located opposite to the first end; and   enlarging the second end of the slender portion so that the enlarged second end of the slender portion is tightly located against an internal side of the wall and that the head is tightly located against an external side of the wall, wherein the head is insertable in helical slit of a cylinder of the lipstick container and a rectilinear slit of another cylinder of the lips stick container.   
     
     
         2 . The method according to  claim 1 , further comprising the step of making the slender portion a tubular portion. 
     
     
         3 . The method according to  claim 1 , wherein the step of enlarging the second end of the slender portion comprises the steps of:
 using a mold to receive the second end of the slender portion; and   using a punching element to punch the head.