A writing instrument between a first end and a second end including a writing element configured to transition between a non-writing state and a writing state, a first housing member oriented about at least a portion of the writing element and extending between the first end and the second end of the writing instrument, and an actuator configured to be moved between a first position and a second position, wherein the writing element is configured to transition from the non-writing state toward the writing state when the actuator moves from the first position toward the second position, and the writing element is configured to transition from the writing state to the non-writing state when the actuator moves from the second position toward the first position.

A pressurized writing implement includes a shaft tube capable of housing therein a refill filled with a writing implement ink composition. The pressurized writing implement further includes a pressurizing mechanism that applies a pressure to the writing implement ink composition, the pressurized writing implement being capable of switching a writing state in which a front end part of the refill projects from a front end opening of the shaft tube, and a not-writing state in which the front end part of the refill is retracted from the front end opening of the shaft tube. The pressurized writing implement further includes a pressurizing-force adjusting mechanism that adjusts the pressure.

A pressurized writing implement includes a shaft tube capable of housing therein a refill filled with a writing implement ink composition. The pressurized writing implement further includes a pressurizing mechanism that applies a pressure to the writing implement ink composition, the pressurized writing implement being capable of switching a writing state in which a front end part of the refill projects from a front end opening of the shaft tube, and a not-writing state in which the front end part of the refill is retracted from the front end opening of the shaft tube. The pressurized writing implement further includes a pressurizing-force adjusting mechanism that adjusts the pressure.

A friction body is configured to discolor handwriting written with a thermochromic ink with frictional heat. The friction body includes a viscoelastic body, and has a Shore A hardness (based on JIS K 7215) immediately after start of contact of an indenter point of from 55 to 95.

A writing implement includes: a barrel; a writing body supported by the barrel so as to be relatively movable with respect to the barrel in an axial direction thereof, whereby the writing body is projected from and retracted into a front end of the barrel; a rotation member disposed in the barrel so as to be relatively rotatable with respect to the barrel about an axis thereof, the rotation member being provided with a groove or a slit that helically extends about the axis; and a pressing unit having a moving unit that moves in the groove or the slit, the pressing unit being relatively movable with respect to the barrel in the axial direction, while its relative rotation about the axis being restricted; wherein the pressing unit can be pressed forward with respect to the barrel.

A writing implement includes: a barrel; a writing body supported by the barrel so as to be relatively movable with respect to the barrel in an axial direction thereof, whereby the writing body is projected from and retracted into a front end of the barrel; a rotation member disposed in the barrel so as to be relatively rotatable with respect to the barrel about an axis thereof, the rotation member being provided with a groove or a slit that helically extends about the axis; and a pressing unit having a moving unit that moves in the groove or the slit, the pressing unit being relatively movable with respect to the barrel in the axial direction, while its relative rotation about the axis being restricted; wherein the pressing unit can be pressed forward with respect to the barrel.

A writing instrument, in particular a pen, comprises a housing comprising a front barrel and a rear barrel, the front barrel having a front opening, two or more cartridges for storing colorants or inks, each cartridge having a writing tip, at least one actuator for selectively moving one of the cartridges within the housing so that the writing tip of a selected cartridge extends through the front opening of the front barrel, and a cartridge guide member which is designed to guide the movement of the cartridges within the housing. The front barrel and to the cartridge guide member are designed to be removed from the rear barrel for replacing one or more of the cartridges. In particular, the front barrel and the cartridge guide member may be removed from the rear barrel while the cartridge guide member may remain mounted to the front member at the same time.

The present invention includes a shaft cylinder having an opening at a front end thereof, a tip holder movable in an axial direction of the shaft cylinder, a tip projectable and retractable in conjunction with a movement of the tip holder, an annular member fitted on the tip holder and axially movable, and an elastic member connecting the tip holder and the annular member so that they are movable relatively to each other. A contact surface tapered toward the front end is formed on an outer periphery of the annular member. A cutout reduces an inner diameter of the annular when a load is received by the contact surface. A guide surface is formed on the part of the inside surface of the shaft cylinder. The contact surface receives the load from the guide surface in conjunction with the movement of the tip holder toward the front end side.

The present invention includes a shaft cylinder having an opening at a front end thereof, a tip holder movable in an axial direction of the shaft cylinder, a tip projectable and retractable in conjunction with a movement of the tip holder, an annular member fitted on the tip holder and axially movable, and an elastic member connecting the tip holder and the annular member so that they are movable relatively to each other. A contact surface tapered toward the front end is formed on an outer periphery of the annular member. A cutout reduces an inner diameter of the annular when a load is received by the contact surface. A guide surface is formed on the part of the inside surface of the shaft cylinder. The contact surface receives the load from the guide surface in conjunction with the movement of the tip holder toward the front end side.

A clip body includes one upper wall extending in a longitudinal direction of a barrel and a pair of side walls formed at least on a front side of the upper wall, projecting from both side portions of the upper wall in a direction of a surface of the barrel, and having inner surfaces facing each other, a holding portion is provided on a back side of the clip body and between the pair of side walls, has a shape capable of producing an elastic force by deformation, and projects more in the direction of the surface of the barrel than the pair of side walls, the surface of the barrel includes a guide groove extending in the longitudinal direction of the barrel, and provided with a bottom surface contacting the holding portion and a pair of side surfaces to restrict lateral movement of the holding portion and a clip base is connected to a rear side of the clip body, and supports the clip body at a height not to cause the pair of side walls to contact the surface of the barrel and the holding portion to contact the bottom surface of the guide groove.