JP2009023272A - Rubbing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubbing implement which can be used by selecting a rubbing part with a desired outer shape suited for a thermodiscoloring area. <P>SOLUTION: The rubbing implement 1 can thermally discolor a handwriting in thermodiscoloring ink by rubbing heat generated when the handwriting in thermodiscoloring ink is rubbed. A first rubbing part 3a by which the handwriting in thermodiscoloring ink can be thermally discolored, is arranged at one end of a holder 2. Further, a second rubbing part 3b by which the handwriting in thermodiscoloring ink can be thermally discolored, is arranged on the other end of the holder 2. The outer shape of the first rubbing part 3a is different from that of the second rubbing part 3b. Next, a first insetting part 2a which can be insetted in a mounting hole 42 of a barrel 4, is arranged on the first rubbing part 3a side exposed through the holder 2. After that, a second insetting part 2b which can be insetted in the mounting hole 42 of the barrel 4, is arranged on the second rubbing part 3b side exposed through the holder 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a friction tool. More specifically, the present invention relates to a friction tool capable of thermally changing the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink and generating frictional heat.

Conventionally, in a thermochromic writing instrument incorporating a thermochromic ink, Patent Document 1 discloses a configuration in which a friction body for thermally discoloring a handwriting by the thermochromic ink by frictional heat is provided on the top of the cap, The structure provided at the rear end of the (shaft of the present invention) is described.

JP 2004-148744 A

Conventionally, when a thermochromic ink handwriting is thermally discolored using a friction body, when a small area of the thermochromic ink handwriting is to be discolored, or a large area of the thermochromic ink handwriting is to be discolored There is a case. Since the conventional thermochromic writing instrument has only one type of friction body at one end of the shaft cylinder or cap, there is a possibility that a friction body suitable for a desired thermochromic area cannot be selected and used.

The present invention is intended to solve the above-mentioned conventional problems, and to provide a friction tool that can select and use a friction portion having an outer shape suitable for a desired thermal discoloration area. .

A first invention of the present application is a friction tool capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink, and at one end of the holder 2 A first friction part 3a capable of thermally changing the ink handwriting is provided, and a second friction part 3b capable of thermally changing the handwriting of the thermochromic ink is provided at the other end of the holder 2, and the first friction part. It is a requirement that the outer shape of 3a and the outer shape of the second friction portion 3b are different (claim 1).

Since the friction tool 1 of the first invention includes two types of friction parts (first friction part 3a and second friction part 3b) having different outer shapes, the outer shape suitable for a desired thermal discoloration area is provided. The friction part which has can be selected and used.

According to a second invention of the present application, in the friction tool 1 of the first invention, the first insertion that can be inserted into the mounting hole 42 of the shaft body 4 on the first friction portion 3a side of the outer surface of the holder 2 is provided. A mounting portion 2 a is provided, and a second insertion portion 2 b that can be inserted into the mounting hole 42 of the shaft body 4 is provided on the second friction portion 3 b side of the outer surface of the holder 2, and the mounting hole 42 of the shaft body 4 is provided. It is a requirement that the first insertion part 2a or the second insertion part 2b is inserted into the second insertion part (Claim 2).

In the friction tool 1 of the second invention, when the first friction portion 3a is used, the second insertion portion 2b is inserted into the mounting hole 42 of the shaft body 4 and the first friction portion 3a is pivoted. When projecting outside the body 4 and using the second friction portion 3b, the first insertion portion 2a is inserted into the mounting hole 42 of the shaft body 4 and the second friction portion 3b is inserted into the shaft body. 4 is projected outside. Since the friction tool 1 according to the second aspect of the present invention is used by inserting the holder 2 to the shaft body 4, it is possible to stably hold when the friction color is changed.

3rd invention of this application requires that the outer diameter of the 1st insertion part 2a and the outer diameter of the 2nd insertion part 2b are equal in the friction tool 1 of the said 2nd invention (Claim 3). And

In the friction tool 1 according to the third aspect of the invention, the outer diameter of the first insertion portion 2a is equal to the outer diameter of the second insertion portion 2b, so that the first insertion portion 2a and the second insertion portion 2a of the holder 2 are the same. Any of the insertion portions 2b can be securely inserted into the mounting hole 42 of the shaft body 4.

According to a fourth invention of the present application, in the friction tool 1 of the second or third invention, the holder 2 and the outer surface of the holder 2 between the first insertion portion 2a and the second insertion portion 2b It is a requirement that the flange portion 21 that can come into contact with the end portion of the shaft body 4 when it is attached to the shaft body 4 is provided.

In the friction tool 1 according to the fourth aspect of the present invention, when the holder 2 (that is, the first insertion portion 2a or the second insertion portion 2b) is inserted into the attachment hole 42 of the shaft body 4, the flange portion 21 is pivoted. Since it abuts against the end of the body 4, the amount of insertion of the first insertion portion 2a or the second insertion portion 2b into the mounting hole 42 can be kept constant, and the holder 2 can be pivoted during use. The stable mounting state of the holder 2 and the shaft body 4 can be maintained without being immersed in the body 4 (inside the mounting hole 42).

According to a fifth invention of the present application, in the friction tool 1 of the second, third, or fourth invention, the thermochromic ink is accommodated in the shaft body 4 and the thermochromic ink is disposed at the front end of the shaft body 4. Is provided with a pen tip 41 that can eject the first and second insertion portions 2a and 2b at the end of the shaft body 4 opposite to the pen tip 41. 42 is provided (claim 5).

The friction tool 1 according to the fifth aspect of the present invention has a pen tip 41 that contains a thermochromic ink and is capable of ejecting the ink, so that the formation of a handwriting of the thermochromic ink and the thermochromic color of the handwriting are: It is obtained by one friction tool 1.

According to a sixth invention of the present application, in the friction tool 1 of the second, third, fourth or fifth invention, the through hole 22 of the holder 2 is provided with the first friction part 3a at one end and at the other end. A core body 3 having a second friction part 3b is inserted, the first friction part 3a protrudes from one end of the holder 2 to the outside, and the second friction part 3b protrudes from the other end of the holder 2 to the outside. (Claim 6).

The friction tool 1 of the sixth invention can be provided at a low cost with a simple structure.

Friction part In the present invention, the first friction part 3a and the second friction part 3b are preferably made of a soft material. Examples of the soft material constituting the first friction part 3a and the second friction part 3b include an elastic resin (rubber, elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer) Coalesce), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The soft material constituting the first friction part 3a and the second friction part 3b is less wearable than the one made of a highly wearable elastic material (for example, an eraser), so that no debris is generated during friction. It is preferably made of an elastic material.

In the present invention, the pen tip 41 has, for example, a ballpoint pen tip, a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, a pipe-shaped pen body, and a slit at the tip. Examples thereof include a fountain pen type plate pen body, a brush pen body, a porous foam body of a synthetic resin, and an extruded body of a synthetic resin having an axial ink guide path.

-Shaft Body In the present invention, the shaft body 4 includes a pen tip holding member that holds the pen tip 41 and a tail plug attached to the rear end opening of the shaft body 4. Examples of the configuration in which the thermochromic ink is accommodated in the shaft body 4 include a direct liquid type in which the thermochromic ink is directly accommodated, or a batting type in which the ink occlusion body is impregnated with the thermochromic ink. .

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic 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 includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

In the present invention, as shown in FIG. 6, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. 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 invention, the color change temperature due to frictional heat of the friction part of the thermochromic ink 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 the 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 portion.

The reversible thermochromic microcapsule pigment preferably has an average particle diameter in the range of 0.5 to 5.0 μm, preferably 1 to 4 μm. When the average particle diameter exceeds 5.0 μm, the outflow from the capillary gap of the ballpoint pen tip or the porous pen body decreases, and when the average particle diameter is 0.5 μm or less, it is difficult to show high density color development. .

The reversible thermochromic microcapsule pigment can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

The friction tool of the present invention can be used by selecting a friction part having an outer shape suitable for a desired thermal discoloration area.

An embodiment of the friction tool 1 of the present invention is shown in FIGS.
The friction tool 1 of the present embodiment includes a holder 2 having a first friction part 3a at one end and a second friction part 3b at the other end, and an attachment hole 42 into which the holder 2 is detachably inserted. It comprises the shaft body 4 provided with.

The holder 2 is a cylindrical body obtained by synthetic resin injection molding. The holder 2 has an axial through hole 22 therein. An annular inward projection 23 is formed on the inner surface of the through hole 22. In addition, a first insertion portion 2 a and a second insertion portion 2 b having the same outer diameter are formed on the outer surface of the holder 2 via a flange portion 21.

A core body 3 made of a low-abrasion elastic material (for example, SBS resin or SEBS resin) that does not generate a chip during friction is inserted into the through-hole 22. The core body 3 has a first friction part 3a at one end and a second friction part 3b at the other end. One end of the core 3 is formed with a large diameter, and the other end is formed with a small diameter. A first friction portion 3 a having a convex curved top is formed at one end of the core body 3. At the other end of the core body 3, a second friction part 3b having a convex curved top is formed. The curvature radius of the convex curved top of the first friction part 3a is different from the curvature radius of the convex curved top of the second friction part 3b. Specifically, the curvature radius of the first friction part 3a is The curvature radius of the convex curved top is set to be larger than the curvature radius of the convex curved top of the second friction portion 3b.

An annular outward projection 31 is formed at an intermediate portion of the outer surface of the core body 3, and a step 32 is formed at the rear end of the first friction portion 3 a on the outer surface of the core body 3. When the core body 3 is inserted into the through hole 22 of the holder 2, the outward projection 31 of the core body 3 and the inward projection 23 of the through hole 22 get over and lock, and the step 32 and the end of the holder 2 are Is pressed in the axial direction. Thereby, shakiness of the axial direction of the core 3 with respect to the holder 2 can be prevented.

When the core 3 is inserted into the through hole 22 of the holder 2, the first friction part 3 a protrudes outside from one end of the holder 2 and the second friction part 3 b protrudes outside from the other end of the holder 2. Is done. The maximum outer diameter of the first friction part 3 a is set smaller than the outer diameter of the first insertion part 2 a of the holder 2 (that is, the inner diameter of the mounting hole 42 of the shaft body 4). The maximum outer diameter of the second friction portion 3b is set smaller than the outer diameter of the second insertion portion 2b of the holder 2 (that is, the inner diameter of the mounting hole 42 of the shaft body 4). Thereby, the holder 2 can be smoothly inserted into the mounting hole 42 of the shaft body 4.

A pen tip 41 made of a ballpoint pen tip or a marking pen is provided at the front end of the shaft body 4. Thermochromic ink is accommodated in the shaft body 4, and the thermochromic ink is ejected from the pen tip 41 to the outside during writing. By writing on the writing surface with the pen tip 41, a handwriting by the thermochromic ink is formed on the writing surface.

A mounting hole 42 that opens rearward is formed at the rear end of the shaft body 4. The inner diameter of the mounting hole 42 is set to be approximately equal to the outer diameter of the first insertion portion 2a and the outer diameter of the second insertion portion 2b. Thereby, the first insertion portion 2a and the second insertion portion 2b of the holder 2 are detachably inserted into the attachment hole 42.

In the thermochromic ink, the low temperature side color change point (complete color development temperature t ₁ ) is set to an arbitrary temperature in the range of −30 ° C. to −10 ° C., and the high temperature side color change point (complete color disappearance temperature t ₄ ) is 60. A reversible thermochromic ink that is set at an arbitrary temperature in the range of from 80 ° C. to 80 ° C. and has a hysteresis width ΔH in the range of from 40 ° C. to 60 ° C. is employed.

As shown in FIG. 3, the second insertion portion 2 b of the holder 2 is inserted into the mounting hole 42 at the rear end of the shaft body 4, and the flange portion 21 of the holder 2 is brought into contact with the rear end of the shaft body 4. . At this time, the first friction part 3a protrudes outside the shaft body 4, and the first friction part 3a can be used.

As shown in FIG. 4, the first insertion portion 2 a of the holder 2 is inserted into the mounting hole 42 at the rear end of the shaft body 4, and the flange portion 21 of the holder 2 is brought into contact with the rear end of the shaft body 4. . At this time, the second friction part 3b protrudes outside the shaft body 4, and the second friction part 3b can be used.

As shown in FIG. 5, the holder 2 is separated from the mounting hole 42 at the rear end of the shaft body 4, and the first friction portion 3 a or the second friction portion 3 b is selected by gripping the holder 2 itself. Can be used.

In the friction tool 1 of the present embodiment, the outer shape of the first friction portion 3a is different from the outer shape of the second friction portion 3b (that is, the contact area with the writing surface when pressed with a constant load). Is different between the first friction part 3a and the second friction part 3b), when the handwriting of a large area thermochromic ink is thermally discolored, the contact area with the writing surface at a constant load is large. A friction part (for example, the first friction part 3a having a large outer diameter or the first friction part 3a having a convex curvature having a large curvature radius at the top) can be selected and used, while a small area thermochromic property. When the ink handwriting is subjected to thermal discoloration, the friction portion having a small contact area with the writing surface under a constant load (for example, the second friction portion 3b having a small outer diameter of the outer shape or the radius of curvature of the top portion of the convex curved surface) A small second friction part 3b) can be selected and used. Thereby, the friction tool 1 can select and use the friction part (the first friction part 3a or the second friction part 3b) having an outer shape suitable for a desired thermal discoloration area.

It is a front view of the holder of an embodiment of the invention. It is a longitudinal cross-sectional view of FIG. It is a partially cutaway longitudinal cross-sectional view which shows the state which inserted the 2nd friction part side (2nd insertion part) of the holder of FIG. 1 in the attachment hole of the shaft body. FIG. 2 is a partially cutaway longitudinal sectional view showing a state in which a first friction part side (first insertion part) of the holder of FIG. 1 is inserted into an attachment hole of a shaft body. It is a partially cutaway longitudinal cross-sectional view which shows the state which isolate | separated the holder and shaft body of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Friction tool 2 Holder 2a 1st insertion part 2b 2nd insertion part 21 ridge part 22 Through-hole 23 Inward protrusion 3 Core 3a 1st friction part 3b 2nd friction part 31 Outward protrusion 32 Step part 4 Shaft body 41 Pen tip 42 Mounting hole

Claims (6)

A friction tool that can thermally change the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink with the frictional heat generated at that time. 1 and a second friction part capable of thermally changing the handwriting of the thermochromic ink at the other end of the holder. The outer shape of the first friction part and the outer shape of the second friction part A friction tool characterized by being different from Provided on the first friction part side of the outer surface of the holder is a first insertion part that can be inserted into the attachment hole of the shaft body, and on the second friction part side of the outer surface of the holder. 2. The friction tool according to claim 1, further comprising a second insertion portion that can be attached to the shaft body, wherein the first insertion portion or the second insertion portion is inserted into the attachment hole of the shaft body. The friction tool according to claim 2, wherein an outer diameter of the first insertion portion and an outer diameter of the second insertion portion are equal. The flange part which can contact | abut the edge part of a shaft body at the time of the insertion of a holder and a shaft body was provided in the outer surface of the holder between a 1st insertion part and a 2nd insertion part, or 3. The friction tool according to 3. A pen tip that accommodates thermochromic ink in the shaft body and is capable of discharging the thermochromic ink is provided at the front end of the shaft body, and the first insertion is performed at the end of the shaft body on the side opposite to the pen tip. The friction tool according to any one of claims 2 to 4, further comprising an attachment hole into which both the first and second insertion portions can be inserted. A core body having a first friction part at one end and a second friction part at the other end is inserted into the through hole of the holder, and the first friction part protrudes from one end of the holder to the outside. The friction tool according to any one of claims 2 to 5, wherein a second friction portion protrudes from the other end of the outer portion.

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