A writing instrument has a gripping tube rotatably fitted on a front portion of a barrel. At the front portion of the barrel, plural identifying marks having different identification characteristics, such as color, are disposed in parallel in a circumferential direction of the barrel. A window portion is provided in the gripping tube through which is visible an identifying mark selected by rotating the gripping tube relative to the barrel. When the user rotates the gripping tube to the position where the chosen color is visible through the window portion, a locking pawl on the barrel engages with a locking groove at the rear end of the gripping tube to lock the gripping tube in this position. Once locked in position, the gripping tube cannot accidentally rotate thereby preventing a change of colors appearing at the window portion even if the writing instrument is subjected to shock or vibration.

A portable kit for storing a pen according to the present invention includes a base in which an accommodation portion is famed. The pen is fastened to the accommodation portion, and is coupled to a coupling kit having a shape corresponding to that of the accommodation portion and accommodated in the accommodation portion. A grip portion is formed on the coupling kit, and allows the pen to be withdrawn from or retracted into the base in such a manner that the grip portion is pushed with a finger.

A portable kit for storing a pen according to the present invention includes a base in which an accommodation portion is famed. The pen is fastened to the accommodation portion, and is coupled to a coupling kit having a shape corresponding to that of the accommodation portion and accommodated in the accommodation portion. A grip portion is formed on the coupling kit, and allows the pen to be withdrawn from or retracted into the base in such a manner that the grip portion is pushed with a finger.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

An improved ergonomic hand-held instrument is provided with a housing having external surfaces defining contours which ergonomically engage surfaces of a user's thumb, index finger and middle finger when the user grasps the instrument, to provide a large surface area of contact between the user's hand and the instrument. The increased area of contact, compared to traditional designs, decreases the required level of applied unit area pressure, and also provides for greater control in manipulating the instrument by a wide range of users. The housing holds a removable cartridge having a working end or tip. The working end may be a pen, pencil, scalpel, knife, stylus, brush or similar tool. The top outer surface of the instrument includes an index finger compression surface for placement of the user's index finger. Base for storage of the instrument and at least one removable cartridge is also disclosed.

An improved ergonomic hand-held instrument is provided with a housing having external surfaces defining contours which ergonomically engage surfaces of a user's thumb, index finger and middle finger when the user grasps the instrument, to provide a large surface area of contact between the user's hand and the instrument. The increased area of contact, compared to traditional designs, decreases the required level of applied unit area pressure, and also provides for greater control in manipulating the instrument by a wide range of users. The housing holds a removable cartridge having a working end or tip. The working end may be a pen, pencil, scalpel, knife, stylus, brush or similar tool. The top outer surface of the instrument includes an index finger compression surface for placement of the user's index finger. Base for storage of the instrument and at least one removable cartridge is also disclosed.

An invisible tracing or drawing activity utilizes a universal self-adjusting UV lamp which forms part of or can attach to a grip which slides onto most writing instruments. The grip is flexible and can stretch to adjust so as to accommodate various sizes of drawing utensils. Blueish (UV) light will reveal hidden artwork that can be traced, drawn, or colored within. Coloring books act as collections of different and unique hidden artwork that can occupy a child's attention for hours, days, or in some circumstances, even weeks.

An invisible tracing or drawing activity utilizes a universal self-adjusting UV lamp which forms part of or can attach to a grip which slides onto most writing instruments. The grip is flexible and can stretch to adjust so as to accommodate various sizes of drawing utensils. Blueish (UV) light will reveal hidden artwork that can be traced, drawn, or colored within. Coloring books act as collections of different and unique hidden artwork that can occupy a child's attention for hours, days, or in some circumstances, even weeks.

A pen comprising a shaft, a gripping zone, and a measuring device having a sensor configured to measure a force acting on the gripping zone. The pen further comprises a cover in the area of the gripping zone, the cover configured to cover the measuring device.