Convertible writing instrument assemblies are provided, including an outer barrel having a tapered nosecone with an aperture for a writing instrument tip and a grip portion, and an aperture for receiving an eraser or a push button therethrough, wherein the writing instrument assembly provides selective access to a volume defined by the outer barrel, and wherein the outer barrel and the volume are collectively configured to operably and interchangeably receive a mechanical pencil insert having the eraser and a retractable pen insert having the push button. Mechanical pencils and pens utilizing the convertible writing instrument assemblies are also provided, along with kits for providing such mechanical pencils and pens.

Convertible writing instrument assemblies are provided, including an outer barrel having a tapered nosecone with an aperture for a writing instrument tip and a grip portion, and an aperture for receiving an eraser or a push button therethrough, wherein the writing instrument assembly provides selective access to a volume defined by the outer barrel, and wherein the outer barrel and the volume are collectively configured to operably and interchangeably receive a mechanical pencil insert having the eraser and a retractable pen insert having the push button. Mechanical pencils and pens utilizing the convertible writing instrument assemblies are also provided, along with kits for providing such mechanical pencils and pens.

The present invention relates to a lift-pull pen, which includes a pen point tube, an outer tube, a refill and a return spring. The pen point tube and the outer tube are nested to form an outer pen shell. The refill is located in the outer pen shell. The return spring is located in the pen point tube and specifically located between a pen point end of the refill and the pen point tube. The pen point tube extends to be provided with one or a plurality of buckle extension bodies and one or a plurality of fixed extension columns extend from the pen point tube.

Convertible writing instrument assemblies are provided, including an outer barrel having a tapered nosecone with an aperture for a writing instrument tip and a grip portion, and an aperture for receiving an eraser or a push button therethrough, wherein the writing instrument assembly provides selective access to a volume defined by the outer barrel, and wherein the outer barrel and the volume are collectively configured to operably and interchangeably receive a mechanical pencil insert having the eraser and a retractable pen insert having the push button. Mechanical pencils and pens utilizing the convertible writing instrument assemblies are also provided, along with kits for providing such mechanical pencils and pens.

Convertible writing instrument assemblies are provided, including an outer barrel having a tapered nosecone with an aperture for a writing instrument tip and a grip portion, and an aperture for receiving an eraser or a push button therethrough, wherein the writing instrument assembly provides selective access to a volume defined by the outer barrel, and wherein the outer barrel and the volume are collectively configured to operably and interchangeably receive a mechanical pencil insert having the eraser and a retractable pen insert having the push button. Mechanical pencils and pens utilizing the convertible writing instrument assemblies are also provided, along with kits for providing such mechanical pencils and pens.

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 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.

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.