Cosmetic Pen

Abstract

A cosmetic pen has a rotary assembly, a pen tube and a discharge assembly. The rotary assembly has a rotary seat, a threaded rod, a drive part and a plunger. The threaded rod is mounted movably in the rotary seat and has an end. The drive part is mounted around the threaded rod. The plunger is mounted rotatably around the end of the threaded rod. An end of the pen tube is connected to the rotary assembly. The discharge assembly is connected to another end of the pen tube. The rotary seat is rotated to drive the threaded rod to push cosmetic liquid out of the discharge assembly. Since the elements of the rotary assembly are simplified production efficiency increases while costs are reduced.

1 . A cosmetic pen comprising:
 a rotary assembly having
 a rotary seat having
 a tube having a closed end, an open end, an inner surface and at least one pair of protrusions oppositely and axially protruding from the inner surface of the tube; and 
 a resilient part protruding around the open end of the tube and having an end surface and multiple ratchets formed around the end surface of the resilient part; 
 
 a threaded rod mounted movably in the rotary seat and having
 an end protruding from the rotary seat; 
 two flat surfaces oppositely and axially formed on the threaded rod; and 
 two channels oppositely and axially formed in two sides of the threaded rod respectively between the flat surfaces and engaging a corresponding pair of protrusions of the rotary seat; 
 
 a drive part mounted around the threaded rod and having
 an outer surface; 
 an end; 
 an end surface; 
 a threaded hole screwed onto the threaded rod; 
 multiple ribs protruding from the outer surface of the drive part; 
 a ring protruding around the end of the drive part; and 
 multiple ratchets formed around the end surface of the drive part and engaging the ratchets of the resilient part of the rotary seat; and 
 
 a plunger mounted rotatably around the end of the threaded rod and having an annular edge; 
   a pen tube connected to the rotary assembly and having
 a storage tube having an open end and a connecting end and containing cosmetic liquid; and 
 a setting tube mounted around the resilient part of the rotary seat, the drive part and the plunger, formed on and protruding from the connecting end of the storage tube and having
 an inner surface abutting the annular edge of the plunger; and 
 multiple tracks formed separately on the inner surface of the setting tube near the storage tube and engaging corresponding ribs of the drive part; 
 
   a discharge assembly mounted in the open end of the storage tube of the pen tube; and   a cap covering the discharge assembly and the open end of the pen tube.   
     
     
         2 . The cosmetic pen as claimed in  claim 1 , wherein
 the resilient part of the rotary seat has an outer surface and a flange protruding around the outer surface of the resilient part near the tube; and   the setting tube of the pen tube has an annular groove formed around the inner surface of the setting tube far away from the storage tube and engaging the flange of the resilient part of the rotary seat.   
     
     
         3 . The cosmetic pen as claimed in  claim 1 , wherein the discharge assembly has a discharge tube mounted in a brush and a nozzle in sequence. 
     
     
         4 . The cosmetic pen as claimed in  claim 2 , wherein the discharge assembly has a discharge tube mounted in a brush and a nozzle in sequence.