Provided is a knock type writing instrument provided with a simple mechanism allowing a stable fretting operation or the like. A knock type writing instrument 1 is provided with: a shaft cylinder 2; a refill 5 arranged inside the shaft cylinder 2; a spring 6 biasing the refill 5 backward; an operation part 20 pressed forward against a biasing force of the spring 6 in a knocking operation; and a main rotor 30, and is switchable between a writing state and a non-writing state with the knocking operation. The knock type writing instrument 1 is further provided with: a knock locking member 50 movable forward and backward inside the shaft cylinder 2 due to gravity; and a locking part 60 provided on a side of the shaft cylinder 2 and capable of being locked with the knock locking member 50. When a front end of the shaft cylinder 2 is directed upward, the knock locking member 50 moves backward to be locked with the locking part 60 to prevent forward movement of the operation part 20.

A pen is provided that utilizes actuating components of a conventional push-button type ballpoint, but which are actuated in a novel and unique manner by the use of an externally mounted lever. The externally mounted and movable lever provides a unique attractiveness to the pen and simulates the lever action used with Early American Western rifles, which in addition to providing a function to the pens, provides an attractive and unique-looking pen which can be combined with other features. A conical nose can be formed of brass which would simulate the end of a bullet and a tubular member can be formed of wood simulating a rifle stock. Also various engraving such as used on many Early American Western rifles can be incorporated into the outer surface of tubular member.

A marking pen including a body having a first end, a second end, a longitudinal axis that extends centrally through the body and through the first end and the second end, and a pen adjacent the first end. The body is generally cylindrical from the first end to the second end. The marking pen further includes a fin that extends from the body between the first end and the second end. The fin is integrally formed with the body and has a height measured normal to the longitudinal axis. The height of the fin gradually increases in a direction from the second end toward the first end.

Provided is a retractable writing instrument including a pen point, a barrel, and a clip. The pen point is configured to be in a state of projecting from the barrel or a state of being retracted into the barrel by sliding the clip in a longitudinal direction of the barrel. The clip includes a clip body extending in the longitudinal direction of the barrel, a ball portion provided on a front side of the clip body and projecting in a direction of a surface of the barrel, and a clip base provided on a rear side of the clip body and is configured to produce a biasing force in a direction of a surface of the barrel. The surface of the barrel includes a guide groove extending in the longitudinal direction of the barrel and provided with a pair of side surfaces to restrict lateral movement of the ball portion, and the guide groove has a through groove capable of causing the ball portion to be in a noncontact state in a direction of the biasing force at least when the pen point is in the retracted state.

Provided is a retractable writing instrument including a pen point, a barrel, and a clip. The pen point is configured to be in a state of projecting from the barrel or a state of being retracted into the barrel by sliding the clip in a longitudinal direction of the barrel. The clip includes a clip body extending in the longitudinal direction of the barrel, a ball portion provided on a front side of the clip body and projecting in a direction of a surface of the barrel, and a clip base provided on a rear side of the clip body and is configured to produce a biasing force in a direction of a surface of the barrel. The surface of the barrel includes a guide groove extending in the longitudinal direction of the barrel and provided with a pair of side surfaces to restrict lateral movement of the ball portion, and the guide groove has a through groove capable of causing the ball portion to be in a noncontact state in a direction of the biasing force at least when the pen point is in the retracted state.

A refill for a writing tool includes an ink containing tube that is made from a resin material and formed in a straight cylindrical shape, and a writing tip that is attached to an end of the ink containing tube. A press-fit portion, formed at the end of the ink containing tube, has a thickness being made thickened toward an inner circumferential surface and has an opening hole penetrating in an axial direction at a central portion of the press-fit portion. The writing tip or a relay member supporting the writing tip is press-fitted and attached to the press-fit portion. The refill for a writing tool can ensure a necessary and sufficient amount of ink stored without expanding an outer diameter of the ink containing tube, and sufficiently secure mechanical strength of an end portion, and a writing tool using the same can be provided.

A multicolor writing instrument with an automatic return function includes a lower housing having a hollow cylindrical shape; an upper housing connected to an upper portion of the lower housing and formed with locking steps; a clip member hingedly provided on the upper housing so as to be movable about a hinge shaft; a coil spring resiliently installed between the clip member and the upper housing; pen cores filled with at least two different color inks; knobs having ends fitted into the respective pen cores; return springs resiliently installed between the pen cores and the knobs; and a return member formed integrally with the clip member on one side of the hinge shaft and toward the respective knobs.

A writing instrument has a detachable clip member with a pliable clip rod. A first clip end member is connected to one end of the pliable clip and has a magnet adapted to be magnetically coupled to a barrel of the writing instrument. A second clip end member is connected to the second rod end and is adapted to be removably and operably connected to the one end of the writing instrument. The second clip end member is also adapted to be magnetically coupled to the first clip end member. The detachable clip member can be moved between at least three positions selected from the group consisting of a resting position, a clasping position, a free-end fidgeting position, a closed-end fidgeting position, and a detached fidgeting position.

A writing instrument has a detachable clip member with a pliable clip rod. A first clip end member is connected to one end of the pliable clip and has a magnet adapted to be magnetically coupled to a barrel of the writing instrument. A second clip end member is connected to the second rod end and is adapted to be removably and operably connected to the one end of the writing instrument. The second clip end member is also adapted to be magnetically coupled to the first clip end member. The detachable clip member can be moved between at least three positions selected from the group consisting of a resting position, a clasping position, a free-end fidgeting position, a closed-end fidgeting position, and a detached fidgeting position.

[Problems] An object of the present invention is to provide: a thermochromic color-memory composition which effectively expresses a property of being able to interchangeably memorize and retain colors and which is thus applicable to various fields;

and a thermochromic color-memory microcapsule pigment encapsulating the same.

[Solution] Provided is a thermochromic color-memory composition including: (a) an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) an ester compound represented by the following Formula (1), as a reaction medium which controls color reaction between the component (a) and the component (b):

##STR00001##

(wherein, R represents an alkyl group having 3 to 18 carbon atoms, a cycloalkylalkyl group having 6 to 11 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms or an alkenyl group having 3 to 18 carbon atoms; each X independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 3 carbon atoms or a halogen atom; and each Y independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group or a halogen atom).