Patent ID: 8123424

Claim:
An ink pen, comprising: an ink feeder, the ink feeder comprising: a main body being made of a rigid material to internally define a feeding bore; a plurality of micro raised portions being radially inward protruded from and circumferentially spaced along an inner wall surface of the main body; and a plurality of ink feeding clearances each being formed between two adjacent ones of the micro raised portions and communicable with the feeding bore in the main body; an ink reservoir communicable with the ink feeder; a felt tip cap having a first end portion and a second end portion opposite to each other; an upper sleeve having a first end portion and a second end portion opposite to each other; the first end portion of the upper sleeve being disposed in the second end portion of the felt tip cap; the second end portion of the upper sleeve upward projecting from the felt tip cap and being formed of a plurality of circumferentially spaced openings; and the second end portion of the upper sleeve also being provided at an upper end thereof with a stopper having a centered through hole; a lower sleeve having a first end portion and a second end portion opposite to each other; the first end portion of the upper sleeve being fitted between the second end portion of the lower sleeve and the second end portion of the felt tip cap, and the second end portion of the lower sleeve having an upper inner end formed into an upward expanded conical bore; an ink guiding core having a stem and a plug, the plug having an outer diameter larger than that of the stem and being located at a middle section of the stem; the stem having a first end portion and a second end portion on each side of the plug, the first and the second end portion of the stem of the ink guiding core being projected into and received in the second end portion of the lower sleeve and the centered through hole of the stopper, respectively; the plug having a first side and a second side opposite to each other, the first side being formed into a conical body for tightly but detachably fitting in the conical bore of the lower sleeve; a spring being disposed between the second side of the plug and the stopper of the upper sleeve; a barrel being externally fitted around the second end portion of the felt tip cap, and internally defining the ink reservoir communicable with the openings on the upper sleeve; and a felt tip having a first end portion and a second end portion opposite to each other; the first and the second end portion of the felt tip being clamped in place by the first end portion of the felt tip cap and between the micro raised portions in the ink feeder, respectively; and the second end portion of the felt tip being abutted on the first end portion of the ink guiding core; wherein the ink feeder is mounted in a lower end of the first end portion of the lower sleeve; and ink stored in the ink reservoir is fed to the felt tip via the plurality of the ink feeding clearances of the ink feeder.