JP2012096388A - Thermochromic writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide thermochromic writing utensil capable of preventing a friction body from being stained upon writing and capable of forming stable handwriting at all times upon writing without damaging gripping property of the writing utensil even when the friction body is detached and is made to be a separate body.SOLUTION: The thermochromic writing utensil 1 stores a thermochromic ink to be ejected from a pen point 3 inside the writing utensil, and is provided with the friction body 6 comprising an elastic material, in which a color of the handwriting is heat-changed with friction heat generated when rubbing the handwriting of the thermochromic ink, on an outer surface of an armoring of the writing utensil. An attachable and detachable clip 4 is provided on the outer surface of the armoring of the writing utensil, and the clip 4 comprises: a support base material 5 comprising synthetic resin or metal; and the friction body 6.

Description

  The present invention relates to a thermochromic writing instrument. Furthermore, the present invention relates to a thermochromic writing instrument having a clip on the outer surface of the writing instrument body.

2. Description of the Related Art Conventionally, a writing instrument that contains thermochromic ink is provided with a friction body for rubbing the handwriting, and is configured to be capable of thermal discoloration due to friction between the writing and the handwriting with a single writing tool.
As the writing instrument, Patent Document 1 discloses that the thermochromic ink is accommodated inside the writing instrument body, the handwriting of the thermochromic ink is rubbed against the outer surface of the writing instrument body, and the handwriting is heated by frictional heat generated at that time. A thermochromic writing instrument provided with a discolorable friction part, wherein an elastic member is provided on the outer surface of the front part of the writing instrument body, and the elastic member becomes a gripping part that can be gripped with fingers during writing, A thermochromic writing instrument is described which becomes a gripping part and a friction part when the handwriting is rubbed.

JP 2009-208313 A

Since the conventional thermochromic writing instrument also serves as a gripping part that can be gripped by a finger, the surface of the friction part is soiled by gripping during writing, and the writing surface (for example, paper) is rubbed by the soiled friction part. There is a risk of smearing the writing surface.
Also, with the conventional thermochromic writing instrument, it is necessary to change the tool and position for each operation because the friction body can be separated by removing the grip and operations with both the left and right hands (writing and friction) are possible. However, with a writing instrument with the grip part removed, the gripping part has a thin outer diameter, and the stepped part for locking the grip part gets in the way, so the gripping property is deteriorated, and a stable handwriting at the time of writing is obtained. It becomes difficult to obtain.

  The present invention solves the above-mentioned conventional problems, can prevent the frictional body from becoming dirty during writing, and impairs the gripping ability of the writing instrument even when the frictional body is removed and separated. Therefore, the present invention provides a thermochromic writing instrument that can always form a stable handwriting during writing.

The present invention contains a thermochromic ink ejected from the pen tip 3 in a writing instrument, and a friction body made of an elastic material in which the handwriting is thermally discolored by frictional heat generated when the handwriting of the thermochromic ink is rubbed. 6 is a thermochromic writing instrument 1 provided on the outer surface of the writing instrument exterior,
A removable clip 4 is provided on the outer surface of the writing instrument exterior, and the clip 4 requires a thermochromic writing instrument 1 comprising a support base 5 made of synthetic resin or metal and a friction body 6.
Further, the writing instrument exterior is the shaft tube 2 or the cap 7, the clip 4 can be attached vertically with respect to the axial direction of the writing instrument body, and the friction body 6 is formed at the tip of the supporting base. It is a requirement that it is the part 61 and the said support base material 5 and the friction body 6 are formed by two-color molding or insert molding.
In the present invention, “front” indicates the pen tip side (cap side in the case of a cap-type writing instrument), and “rear” indicates the shaft tube side.

  According to claim 1, the thermochromic writing instrument 1 of the present invention can use the friction body 6 as a separate body from the writing instrument. At that time, since the gripping property of the writing instrument is not impaired, a stable handwriting can be always formed at the time of writing, and since it is not pinched with fingers, it is possible to avoid the friction body 6 from being soiled at the time of writing. Further, since the friction body 6 can grip and rub the hard support base material 5, it is easy to rub.

  According to the second aspect, since the clip 4 can be formed at the rear side of the shaft cylinder or the front side of the cap, the action as the clip for clamping can be surely expressed.

  According to the third aspect, since the shaft cylinder 2 and the cap 7 are provided behind the support base 5, the gripping property when using the friction body is further improved. Moreover, the friction which changes a direction from a writing state to a shaft cylinder rear end similarly to the conventional usage method is also attained.

  According to the fourth aspect, when the writing instrument is inserted into a pocket such as a shirt, it can be sandwiched between the outer surface portion of the writing instrument exterior and the friction body 6 that is an elastic material, so that a high clamping force can be exhibited and the fabric is not damaged.

  According to the fifth aspect, since the friction body 6 does not come off from the support base material 5, it is possible to rub the handwriting with a stronger force at the time of friction and to form a complicated design by molding.

It is an external view which shows an example of embodiment of this invention. It is principal part explanatory drawing of the state which removed the clip of FIG. 1 (clip reverse direction). It is the principal part side view of FIG. 1, and AA 'line sectional drawing. It is a principal part side view explaining another form of FIG. It is the external view which shows an example of other embodiment of this invention, and a BB 'sectional view taken on the line. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

<First embodiment>
A first embodiment of the thermochromic writing instrument 1 of the present invention will be described with reference to FIGS.
The thermochromic writing instrument 1 shown in FIG. 1 is a retractable ballpoint pen in which a pen tip 3 protrudes and retracts from the tip of a shaft cylinder by a pressing operation of a rear end portion. In the thermochromic writing instrument 1, a refill containing thermochromic ink in an ink storage tube having a nib 3 connected to the tip is accommodated inside a shaft cylinder 2 that is an exterior of the writing instrument. In addition, a pressing operation unit 23 is provided at the rear end of the shaft cylinder 2 to make the pen tip 3 appear and disappear. Further, a detachable clip 4 is provided on the outer surface of the shaft tube 3, and a friction body 6 is provided on the clip 4 to discolor the handwriting of the thermochromic ink with frictional heat.

-Refill The refill has a nib 3 connected to the tip of an ink storage tube made of a metal thin tube or a cylindrical resin molding directly or via a holder, and the ink storage tube is filled with thermochromic ink. In addition, an ink follower is disposed at the rear end of the ink as desired. Further, a tail plug having an air passage is provided at the rear end of the refill.

-Pen tip As the pen tip 3, a pen tip for a marking pen such as a fiber tip, a felt tip, a plastic tip, or a ball holding portion in which the vicinity of the tip of a metal pipe is pressed and deformed inward from the outer surface. A chip formed by holding a ball, a chip formed by holding a ball in a ball holding part formed by cutting a metal material with a drill or the like, or a chip formed by cutting a metal pipe or metal material A ballpoint pen tip such as a tip in which a ball to be held is urged forward by a spring body can be applied. In addition, cemented carbide, stainless steel, ruby, ceramic, etc. can be applied to the balls used for the ballpoint pen tip.
In this embodiment, a ballpoint pen nib 3 in which a cemented carbide ball is held in a ball holding portion formed by cutting a metal material and the ball is biased forward by a spring body is applied. .

・ Thermochromic ink The thermochromic ink built into the refill can be either reversible thermoreversible or irreversible thermochromic, but it is based on the handwriting erased and discolored by the user when desired. The reversible thermochromic ink is preferable because it can be returned to the handwriting of the ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink is conventionally known (a) electron donating color-forming organic compound, (b) electron-accepting compound, and (c) the color reaction of both. A reversible thermochromic pigment in which a reversible thermochromic composition containing at least the essential three components of a reaction medium for determining the occurrence temperature of the polymer is encapsulated in a microcapsule is preferably used.

In the present embodiment, as shown in FIG. 6, the shape of the curve plotting the change in the color density due to the temperature change is higher than the color change temperature range, contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different route from the case of descending from the side, and the color develops in a low temperature region below the complete color development temperature (t ₁ ), or the color erases in a high temperature region above the complete color erase temperature (t ₄ ). Color memory retention type thermochromic ink (gel ink) that can be stored in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)] is applied. In FIG. 6, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present embodiment, the color change temperature of the thermochromic ink due to the frictional heat of the friction body 6 is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [ It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Accordingly, it is possible to effectively maintain the color exhibited in a normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction body 6.

・ Shaft cylinder (writing instrument exterior)
The shaft cylinder 2 serving as the writing instrument exterior is a cylindrical body in which a refill is accommodated and a clip 4 provided with a friction body 6 is disposed on the outer surface, and is formed from a metal processed body or a synthetic resin molded body.
In the present embodiment, a front shaft 21 obtained by injection molding a resin material obtained by adding a colorant into polycarbonate resin (having an elastomeric grip by two-color molding and arranging a spring body inside), and a rear It is composed of two parts, a rear shaft 22, which is provided with a pressing operation portion that can move back and forth at the end, and is screwed in a refill accommodation state to form a shaft cylinder 2. In addition, a rotating cam mechanism that operates when the pen tip moves in and out is provided inside the rear shaft 22.
The shaft cylinder 2 is configured such that the pen tip 3 can be projected and retracted from the tip end by pressing the pressing operation portion 23 at the rear end forward while the refill is accommodated.

Further, an attachment portion 24 for detachably attaching the clip 4 by fitting or engagement is formed on the outer surface of the shaft tube 2.
In the present embodiment, a plate-shaped rectangular parallelepiped with the four corners dropped is integrally formed with the rear shaft 22 so as to protrude in the radial direction from the outer surface of the shaft cylinder, and the shaft cylinder on the side surface of the long side of the plate-shaped rectangular parallelepiped. A groove 25 extending in the axial direction is formed in the vicinity of the outer surface (see FIGS. 2 and 3). The mounting section 24 has a substantially T-shaped cross section (see the cross-sectional view in FIG. 3). Further, a projection is formed in the radial direction substantially at the center of the groove portion 25 in the axial direction, and the clip 4 is locked so that the attachment portion 24 is sandwiched between the groove portions 25 on both side surfaces. Slides in the axial direction to prevent falling off. By adopting a shape in which the groove portion 25 is provided in the attachment portion, the clip 4 can be attached in the front-rear direction (vertical direction at the time of writing) with respect to the axial direction of the writing instrument body (see FIGS. 3 and 4). As a result, when the friction body 6 is formed at the tip of the clip, the tip of the clip 2 is changed from the pen tip side to the rear end side of the shaft tube to form a friction form, so that the shaft tube 2 is placed on the side of the support portion. Therefore, the gripping property when using the friction body is higher than that of the clip alone.

-Clip The said clip 4 is comprised by the support base material 5 which consists of a synthetic resin or a metal, and the friction body 6 which consists of elastic materials, and expresses clamping property, when it attaches to a writing instrument exterior. Therefore, the support base 5 is formed in a shape and thickness that can provide flexibility. The support base 5 is formed with a locking portion 51 for being detachably attached to the outer surface of the shaft tube. By forming the locking part 51 with a hard material, the clip 4 can be held without dropping when attached to the writing instrument exterior.
In the present embodiment, the engaging portion 51 is formed at the rear end of the plate-like support base made of polycarbonate resin, and the elastomer friction body 6 having the sandwiching portion 61 is formed at the front end of the support base 5 by two-color molding. Provided.
The locking portion 51 is a portion where the clip 4 is attached to the mounting portion 24 of the shaft tube 2, and a leg portion 52 for slidingly inserting and locking in the groove portion of the mounting portion 24 has a substantially C-shaped cross section. It is formed (see the sectional view of FIG. 3). Since the leg portion 52 is formed in the axial direction so as to seal the rear end side of the support base material 5, the rear end side comes into contact with one end of the mounting portion 24 when mounted by being slid from behind. It is securely locked in a state where it is slid. The locking portion 51 can be locked in the same state when the clip 4 is attached in the opposite direction to the axial direction. In addition, at the time of removal, it can be easily removed by sliding in the direction opposite to that at the time of attachment.
Further, a planar holding portion 61 is formed on the friction body 6 so as to come into contact with the outer surface of the shaft cylinder with the clip 4 attached.

-Friction body The friction body 6 is formed by two-color molding or insert molding with the support base material 5 in addition to being attached by connecting (fitting) what is formed separately from the support base material 5, At least a part of the outer surface is provided in a shape or position where it can contact a surface to be rubbed such as paper. In particular, it is preferable that the friction body 6 is formed at the front end of the support base material and also serves as the clamping portion 61 that contacts the outer surface of the shaft cylinder.
The friction body 6 is preferably made of an elastic resin (rubber or elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene). -Styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The elastic material constituting the friction body 6 is preferably made of a low-abrasion elastic material that does not generate wear debris during friction, rather than a high-abrasion elastic material (for example, an eraser).

<Second embodiment>
FIG. 5 shows a second embodiment of the thermochromic writing instrument 1 of the present invention.
The thermochromic writing instrument 1 in FIG. 5 has a cap-type configuration in which an ink occlusion body impregnated with thermochromic ink is accommodated in a shaft cylinder, and a cap 7 having a clip 4 is fitted on the marking pen tip side. It is a marking pen. The clip 4 is detachably provided on the outer surface of a cap 7 that is a writing instrument exterior, and the clip 4 is provided with a friction body 6 that discolors the handwriting of the thermochromic ink with frictional heat. Note that configurations other than the cap 7 are the same as those described above.

・ Cap (writing instrument exterior)
The cap 7 serving as the writing instrument exterior is a cylindrical body that is fitted so as to hermetically cover the pen tip side of the shaft cylinder 2, and is formed from a metal processed body or a synthetic resin molded body, and is located behind the rear end of the shaft cylinder. An insertion is also possible. Moreover, the attachment part 71 for latching the clip 4 provided with the friction body 6 so that attachment or detachment is possible is formed in the outer surface.
In the present embodiment, the cap 7 in which the mounting portion 71 is integrated is formed by injection molding a resin material in which a coloring material is added to a polycarbonate resin. The mounting portion 71 is formed so that a plate-like rectangular parallelepiped having four corners dropped from the outer surface of the cap, and extends in the axial direction in the vicinity of the outer surface of the cap on the side of the long side of the plate-like rectangular parallelepiped. A groove portion 72 is formed, and the mounting section 71 has a substantially T-shaped cross section (see the cross-sectional view of FIG. 5). In addition, a projection in the radial direction is formed at a substantially center in the axial direction of the groove portion 72, and the clip 4 is locked so that the mounting portion 71 is sandwiched between the groove portions 72 on both side surfaces, and the clip 4 is Slides in the axial direction to prevent falling off. The clip 4 can be attached in the front-rear direction (vertical direction when the pocket is inserted) with respect to the axial direction of the writing instrument main body by forming the groove portion 72 in the attachment portion 71. Thereby, in the clip 4 in which the friction body 6 is formed at the tip, the cap 7 is extended to the locking portion side of the support base material 5 by changing the tip of the clip in the reverse direction from the sandwiched state to the friction form. Therefore, the gripping property when using the friction body is higher than that of the clip alone.

Clip The clip 4 is composed of a support base material 5 made of a synthetic resin or metal and a friction body 6 made of an elastic material, and exhibits clipability when attached to the cap exterior. Therefore, the support base 5 is formed in a shape and thickness that can provide flexibility. Further, the support base 5 is formed with a locking portion 51 for detachably attaching to the outer surface of the cap. By forming the locking part 51 with a hard material, the clip 4 can be held without dropping when attached to the writing instrument exterior.
In the present embodiment, a locking portion 51 is formed by bending at the rear end of the metal plate-like support base material 5, and an elastomer friction body 6 having a sandwiching portion 61 is formed by insert molding on the support base material 5. Provided at the tip.
The engaging part 51 is a part for attaching the clip 4 to the attaching part 71 of the cap 7, and a leg part 52 for sliding and engaging in the groove part of the attaching part 71 is crossed by the bent piece. It is formed in a substantially C-shaped surface (see the sectional view in FIG. 5). The said leg part 52 is formed in the axial direction, and the rear end side (axial direction edge part in which the friction body is not formed) is sealed with another bending piece. Therefore, when it is slid and inserted from the cap closing part side, it is securely locked in a state where the rear end side is slid to a position where it comes into contact with one end of the attachment part 71. The locking portion 51 can be locked in the same state when the clip 4 is mounted in the opposite direction to the axial direction (that is, sliding insertion from the cap opening side). In addition, at the time of removal, it can be easily removed by sliding in the direction opposite to that at the time of attachment.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front shaft 22 Rear shaft 23 Press operation part 24 Attachment part 25 Groove part 3 Pen tip 4 Clip 5 Support base material 51 Locking part 52 Leg part 6 Friction body 61 Holding part 7 Cap 71 Attachment part 72 Groove t ₁ Complete color development temperature t ₂ Color development start temperature t ₃ Color erase start temperature t ₄ Complete color erase temperature ΔH Hysteresis width

Claims (5)

A thermochromic ink discharged from the pen tip is contained in the writing instrument, and a friction body made of an elastic material that thermally changes the handwriting by frictional heat generated when the handwriting of the thermochromic ink is rubbed is provided on the outer surface of the writing instrument exterior. A thermochromic writing instrument provided in the
A thermochromic writing instrument, wherein a detachable clip is provided on an outer surface of the outer casing of the writing instrument, and the clip includes a support base made of synthetic resin or metal and a friction body. The thermochromic writing instrument according to claim 1, wherein the writing instrument exterior is a shaft tube or a cap. The thermochromic writing instrument according to claim 1 or 2, wherein the clip can be attached vertically with respect to the axial direction of the writing instrument body.   The thermochromic writing instrument according to any one of claims 1 to 3, wherein the friction body is a sandwiching portion formed at a tip of a supporting base material.   The thermochromic writing instrument according to any one of claims 1 to 4, wherein the support base and the friction body are formed by two-color molding or insert molding.

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