Patent ID: 7168875

Claim:
A cosmetic pen comprising: a hollow outer body; a hollow inner body received in a first end of the outer body and having a chamber defined therein: a lip stick unit received in a second end of the outer body and including a hollow sleeve which includes a first exterior threaded section, a driving member which is rotatably connected to the sleeve and a base connected between the driving member and the hollow sleeve, a first cap removably mounted to the sleeve and having a first interior threaded section defined in an inner periphery thereof so as to be engaged with the first exterior threaded section of the sleeve, and a transmission unit received in the lip stick unit and having a threaded rod which is engaged with a threaded hole of a guide member, a section of the threaded rod inserted into the a passage defined axially in the base, a positioning member mounted to the threaded rod and guiding the threaded rod to move linearly, a piston connected to the threaded rod.