Method and device for advancing a lead and an eraser in a mechanical pencil and for advancing a pen and an eraser in a pen

摘要

A mechanical pencil and/or pen and method for operating a mechanical pencil and/or pen is provided. The mechanical pencil includes a barrel, a lead chamber, a first pressure actuator, an eraser chamber, and a second pressure actuator. The first pressure actuator is situated on the outer surface and is coupled to the lead chamber. The lead chamber holds the lead and pressing the first pressure actuator advances the lead chamber causing the lead to advance. The second pressure actuator is situated on the outer surface and is coupled to the eraser chamber. The eraser chamber holds the eraser and pressing the second pressure actuator advances the eraser chamber causing the eraser to advance. A pen including a barrel, a pen chamber, an eraser chamber, and an eraser pressure actuator is also provided. The barrel includes a pen-end, an eraser-end, and an outer surface. The pen chamber is situated in the pen-end and holds the pen. The eraser chamber is situated in the eraser-end and holds an eraser. The eraser pressure actuator is situated on the outer surface and is coupled to the eraser chamber. Pressing the eraser pressure actuator advances the eraser chamber causing the eraser to advance. A method for operating a mechanical pencil includes pushing a first pressure actuator to advance a lead in a lead advance direction out a pencil nozzle and pushing a second pressure actuator to advance an eraser in an eraser advance direction out an eraser nozzle. Retracting the lead is achieved by depressing the first pressure actuator and applying pressure to a tip of the lead projecting out the pencil nozzle. Retracting the eraser is achieved by depressing the second pressure actuator and applying pressure to a tip of the eraser projecting out the eraser nozzle.