Abstract: A mechanical crayon pen with an internal cartridge to hold multiple crayon sticks has a transparent barrel (10) with an open top, an inner diameter and an inner surface, a thrust device (20) mounted inside the transparent barrel (10) and a thrust actuator (30) mounted on the open top of the transparent barrel (10). The thrust device (20) has an inner tube (21) movably mounted inside the transparent barrel (10). The inner tube (21) has an outer surface and an outer diameter smaller than the inner diameter of the transparent barrel (10) to form a space (13) in the mechanical crayon pen to store multiple crayon sticks. Multiple longitudinal grooves may be defined in the inner surfaces defining the space (13) to hold individual crayon sticks.

Abstract: A mechanical crayon pen with an internal cartridge to hold multiple crayon sticks has a transparent barrel (10) with an open top, an inner diameter and an inner surface, a thrust device (20) mounted inside the transparent barrel (10) and a thrust actuator (30) mounted on the open top of the transparent barrel (10). The thrust device (20) has an inner tube (21) movably mounted inside the transparent barrel (10). The inner tube (21) has an outer surface and an outer diameter smaller than the inner diameter of the transparent barrel (10) to form a space (13) in the mechanical crayon pen to store multiple crayon sticks. Multiple longitudinal grooves may be defined in the inner surfaces defining the space (13) to hold individual crayon sticks.

Abstract: A pencil-shaped eraser comprising an elongate tube for placing a bar eraser therein, a sleeve to fit around a lower portion of the tube movably, the lower portion of the tube having a plurality of claws divided by slots and movable inward, the claws respectively having a larger diameter constricting section and a smaller diameter loosening section, the sleeve having a hollow passageway consisting of a distal smaller diameter section and a proximal larger diameter section, the distal constricting section constricting the constricting section of the tube so that the claws may be compressed inward to constrict a bar eraser a little protruding out of the claws.