Abstract: A tail plug to be attached to a tail end of a shaft part of a writing instrument includes an inner plug that is fitted into the shaft part and an outer plug that is coupled with the inner plug. The inner plug has a first opening through which a fluid can flow in an axial direction of the shaft part; the outer plug has a second opening through which a fluid can flow in the axial direction of the shaft part, and at least one of the first opening and the second opening are configured to be closed when the outer plug and the inner plug are coupled with each other.

Abstract: Provided is a tail plug to be attached to a tail end of a shaft part of a writing instrument. The tail plug includes an inner plug that is fitted into the shaft part and an outer plug that is coupled with the inner plug. The inner plug has a first opening through which a fluid can flow in an axial direction of the shaft part; the outer plug has a second opening through which a fluid can flow in the axial direction of the shaft part, and at least one of the first opening and the second opening are configured to be closed when the outer plug and the inner plug are coupled with each other.

Abstract: A pen includes: an ink reservoir configured to store an ink; and a pen tip section including an ink application part configured to apply the ink to an ink application object. The ink application part of the pen tip section includes: a rigid tip made of a rigid material and having a hemispherical outer surface, an inner surface facing toward the ink reservoir, and a penetration part penetrating from the inner surface side to the outer surface side of the rigid tip; and at least one foam body filled in the penetration part at least on the side of the penetration part close to the outer surface side of the rigid tip, and provided with at least one air bubble formed to communicate from the outer surface side of the foam body to the inner surface side of the foam body.

Abstract: A pen includes: an ink reservoir configured to store an ink; and a pen tip section including an ink application part configured to apply the ink to an ink application object. The ink application part of the pen tip section includes: a rigid tip made of a rigid material and having a hemispherical outer surface, an inner surface facing toward the ink reservoir, and a penetration part penetrating from the inner surface side to the outer surface side of the rigid tip; and at least one foam body filled in the penetration part at least on the side of the penetration part close to the outer surface side of the rigid tip, and provided with at least one air bubble formed to communicate from the outer surface side of the foam body to the inner surface side of the foam body.

Abstract: The present invention provides an ink filling tool including: an ink tank having an internal space configured to store a liquid ink; and a cylindrical nozzle having an inner hole communicating with the internal space of the ink tank, the nozzle being insertable into the through hole. The nozzle is configured to be capable of pressing the valve mechanism which is present inside a pen in a state of being inserted into the through hole, and the nozzle has an ink circulating part configured to communicate the inner hole with an outside in a direction orthogonal to the axis of the nozzle.

Abstract: The present invention provides an ink filling tool including: an ink tank having an internal space configured to store a liquid ink; and a cylindrical nozzle having an inner hole communicating with the internal space of the ink tank, the nozzle being insertable into the through hole. The nozzle is configured to be capable of pressing the valve mechanism which is present inside a pen in a state of being inserted into the through hole, and the nozzle has an ink circulating part configured to communicate the inner hole with an outside in a direction orthogonal to the axis of the nozzle.

Abstract: A writing instrument adapted, responsive to a pressure axially applied to a pen core, to supply ink in an ink chamber to the pen core, and includes a valve seat disposed between the ink chamber and the pen core, a valve body operable to be selectively moved between a close position where the valve body is in contact with the valve seat to isolate the pen core from the ink chamber and an open position where the valve body is spaced apart from the valve seat to communicate the pen core with the ink chamber, a pressing spring for biasing the valve body toward the front end of a pen shaft, and a support member for supporting the valve body and the pressing spring to allow the valve body to be moved in the axial direction. The support member includes a communication channel for communicating the inner space thereof with the ink chamber.

Abstract: A brush flatter is detachably attachable to a tip portion of a shaft of a drawing instrument having a brush member at the tip portion thereof. The brush flatter is provided with a casing having a space to allow the brush member of the drawing instrument to pass in an axial direction of the shaft, a shaft fitting portion formed at a proximal end portion of the casing, the shaft fitting portion having such a configuration as to fittingly seat on the tip portion of the shaft of the drawing instrument, and a brush pressing portion formed at a distal end portion of the casing, the brush pressing portion defining a slit-like opening through which a tip portion of the brush member pressedly passes so that an exposed tip portion of the brush member comes into a flat form when the shaft fitting portion of the casing fittingly seats on the tip portion of the shaft of the drawing instrument. A drawing instrument is attached with such brush flatter.

Abstract: A brush flatter is detachably attachable to a tip portion of a shaft of a drawing instrument having a brush member at the tip portion thereof. The brush flatter is provided with a casing having a space to allow the brush member of the drawing instrument to pass in an axial direction of the shaft, a shaft fitting portion formed at a proximal end portion of the casing, the shaft fitting portion having such a configuration as to fittingly seat on the tip portion of the shaft of the drawing instrument, and a brush pressing portion formed at a distal end portion of the casing, the brush pressing portion defining a slit-like opening through which a tip portion of the brush member pressedly passes so that an exposed tip portion of the brush member comes into a flat form when the shaft fitting portion of the casing fittingly seats on the tip portion of the shaft of the drawing instrument. A drawing instrument is attached with such brush flatter.

Abstract: A writing instrument adapted, responsive to a pressure axially applied to a pen core, to supply ink in an ink chamber to the pen core, and includes a valve seat disposed between the ink chamber and the pen core, a valve body operable to be selectively moved between a close position where the valve body is in contact with the valve seat to isolate the pen core from the ink chamber and an open position where the valve body is spaced apart from the valve seat to communicate the pen core with the ink chamber, a pressing spring for biasing the valve body toward the front end of a pen shaft, and a support member for supporting the valve body and the pressing spring to allow the valve body to be moved in the axial direction. The support member includes a communication channel for communicating the inner space thereof with the ink chamber.

Abstract: A writing tool is provided. An ink reservoir (7) and an ink supply passage (9) are formed in a barrel (1) provided with a brush body (2). Ink contained in the ink reservoir (7) is supplied to the brush body (2) via the ink supply passage (9). A wire (17) movably provided in the ink supply passage (9) is movably supported by a coiled spring (16). A ball (18) is provided in the ink reservoir (7). While the barrel (1) is being moved, the ball (18) collides with the coiled spring (16), thereby moving the wire (17).

Abstract: A stippling tool comprising includes a cylindrical main body defining an ink containing chamber therein, a slender ink transfer member having a proximal end portion to which ink in the ink containing chamber is supplied, and a distal end portion extending to an opening of the main body, in which ink is transferred from the proximal end portion to the distal end portion, and a porous elastic stippling member provided on the distal end portion of the ink transfer member, through which the ink permeates. The stippling member having a stippling distal end surface outwardly projecting in a curved shape, and the distal end surface being elastically deformed by a stroke pressure.

Abstract: The present invention is directed to a writing tool, in which an ink reservoir 7 and an ink supply passage 9 are formed in a barrel 1 provided with a brush body 2, so that ink contained in the ink reservoir 7 is supplied to the brush body 2 via the ink supply passage 9. A wire 17 movably provided in the ink supply passage 9 is movably supported by a coiled spring 16. A ball 18 is provided in the ink reservoir 7. While the barrel 1 is being moved, the ball 18 collides with the coiled spring 16, thereby moving the wire 17.

Abstract: A stippling tool comprising includes a cylindrical main body defining an ink containing chamber therein, a slender ink transfer member having a proximal end portion to which ink in the ink containing chamber is supplied, and a distal end portion extending to an opening of the main body, in which ink is transferred from the proximal end portion to the distal end portion, and a porous elastic stippling member provided on the distal end portion of the ink transfer member, through which the ink permeates. The stippling member having a stippling distal end surface outwardly projecting in a curved shape, and the distal end surface being elastically deformed by a stroke pressure.