Patent ID: 6899483

Claim:
A mechanical crayon pen with an internal cartridge for multiple crayon sticks comprising: a transparent barrel ( 10 ) having an open top ( 12 ), a bottom tip ( 11 ), an inner diameter, an outer diameter and an inner surface; multiple longitudinal grooves ( 14 ) are defined on the inner surface of the transparent barrel ( 10 ); a thrust device ( 20 ) mounted inside the transparent barrel ( 10 ) and having an inner tube ( 21 ) movably mounted inside the transparent barrel ( 10 ), wherein the inner tube ( 21 ) has an outer surface, a top end, a bottom end and an outer diameter smaller than the inner diameter of the transparent tube ( 10 ) so that a space ( 13 ) is formed between the transparent barrel ( 10 ) and the inner tube ( 21 ) to hold the multiple crayon sticks; a hollow shaft ( 24 ) having a top end pressed into the bottom end of the inner tube ( 21 ) and a bottom end; a clutch ring ( 23 ) mounted at the bottom end of the hollow shaft ( 24 ) and accommodated at the bottom tip ( 11 ) in the transparent barrel ( 10 ); and a spring ( 22 ) mounted around the shaft ( 24 ) between the bottom end of the inner tube ( 21 ) and the clutch ring ( 23 ); and a thrust actuator ( 30 ) detachably mounted on the open top ( 12 ) of the transparent barrel ( 10 ) and having a cap ( 32 ) with a central hole ( 321 ) rotatably mounted on the open top ( 12 ) of the transparent barrel ( 10 ); and a pushbutton ( 31 ) detachably and movably mounted on the cap ( 32 ) to push the inner tube ( 21 ) downward.