Writing instrument

A thermochromic writing instrument, comprising:

• a thermochromic ink stored inside a writing body;
• a nib capable of ejecting the thermochromic ink provided at a front end of the writing body;
• a barrel storing the writing body longitudinally movably in a backwardly biased condition therein;
• and a front end hole of the barrel configured to allow the nib of the writing body to appear therefrom, wherein
• a longitudinally extending slide hole is provided in a side wall of the barrel, a clip body is projected radially outward from the slide hole, the clip body is configured to become longitudinally movable along the slide hole, the writing instrument further includes an appearance mechanism putting the nib in a projection condition from the front end hole of the barrel by slide operating the clip body forward from a nib retraction condition, and putting the nib in the retraction condition by operating the clip body from the nib projection condition, and a friction unit rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time is provided at a rear end of the barrel.

A writing instrument, comprising:

• a writing body stored in a barrel;
• an operation body provided in the barrel to be operated to longitudinally move the writing body;
• and a nib of the writing body configured to be capable of appearing from a front end of a writing instrument, wherein
• the writing instrument further includes at least one clip body as the operation body, a longitudinally extending slide hole provided in a side wall of the barrel, and an appearance mechanism putting the nib of the writing body from a retraction condition into a projection condition by slide operating the clip body placed in the slide hole forward, and
• the barrel includes a plurality of components capable of being coupled to each other, a first or second long hole longitudinally extending and opened forward or backward is provided respectively on respective side walls of two of the components configuring the barrel, and when coupling the two components, the first and second long holes form the slide hole in communication with each other.

A writing instrument, comprising:

• a writing body stored in a barrel;
• an operation body provided in the barrel to be operated to longitudinally move the writing body;
• and a nib of the writing body configured to be capable of appearing from a front end of a writing instrument, wherein
• the writing instrument further includes a longitudinally extending slide hole provided in a side wall of the barrel and an appearance mechanism putting the nib of the writing body from a retraction condition into a projection condition by slide operating the operation body placed in the slide hole forward,
• the barrel includes therein, as the appearance mechanism, a plurality of longitudinally extending cam teeth and cam grooves alternately placed along a circumferential direction, a rotary member having a plurality of projected ribs rotatably placed in a rear of the writing body and capable of alternately engaging with the cam teeth or the cam grooves, another plurality of cam teeth provided in the operation body and turning the rotary member, and an biasing member biasing the writing body backward,
• the operation body is provided with a longitudinally extending stem stored in the barrel, and the stem and the rotary member are locked to each other in a condition having longitudinal allowance, and
• by slide operating the operation body forward against a biasing force of the biasing member, the projected ribs are alternately engaged with the cam teeth or the cam grooves at longitudinally different positions to alternately put the nib of the writing body in the projection condition or the retraction condition.