Abstract: A retractable ink pen including an elongate ink cartridge having a writing end and an exposed ink opening, wherein the writing end moves from a retracted position to an extended position for writing. The retractable ink pen includes a cap including a recess with an inner surface having one of: i) a position structure, and ii) both a first locator and a second locator spaced a distance from the first locator along a first longitudinal axis. The retractable ink pen further includes an elongate barrel including an outer surface having the other of the position structure and both the first locator and the second locator, wherein the position structure is located at the first locator when the writing end is in the retracted position and wherein the locating structure is located at the second locator when the writing end is in the extended position.

Abstract: A retractable ink pen including an elongate ink cartridge having a writing end and an exposed ink opening, wherein the writing end moves from a retracted position to an extended position for writing. The retractable ink pen includes a cap including a recess with an inner surface having one of: i) a position structure, and ii) both a first locator and a second locator spaced a distance from the first locator along a first longitudinal axis. The retractable ink pen further includes an elongate barrel including an outer surface having the other of the position structure and both the first locator and the second locator, wherein the position structure is located at the first locator when the writing end is in the retracted position and wherein the locating structure is located at the second locator when the writing end is in the extended position.

Abstract: A retractable pen includes a cartridge partially received in a recess of a cap such that a first end of the cartridge is fixedly attached to the cap. An elongate barrel includes first and second open ends and a through channel fluidly interconnecting the first and second open ends. A portion of the barrel is snugly and threadedly received in the recess such that the cartridge is received in and extends through the through channel, and the barrel and the cap are rotatingly movable relative to each other via the threaded engagement between an extended position in which the second end of the cartridge extends through and out of the second open end of the barrel, and a retracted position in which the second end of the cartridge is disposed within the barrel.

Abstract: A retractable pen includes a cartridge partially received in a recess of a cap such that a first end of the cartridge is fixedly attached to the cap. An elongate barrel includes first and second open ends and a through channel fluidly interconnecting the first and second open ends. A portion of the barrel is snugly and threadedly received in the recess such that the cartridge is received in and extends through the through channel, and the barrel and the cap are rotatingly movable relative to each other via the threaded engagement between an extended position in which the second end of the cartridge extends through and out of the second open end of the barrel, and a retracted position in which the second end of the cartridge is disposed within the barrel.