A WRITING INSTRUMENT FOR ERASURING HANDWRITTEN CONTENT

Abstract

The present invention provides a writing instrument having a function of erasing handwritten content. The writing instrument having a function of erasing handwritten content according to the present invention comprises: a hollow tube-shaped housing 110; an ink filling tube 130 containing adhesive ink inside the housing; a ballpoint pen tip 140 flowing the adhesive ink onto the paper P to write words W; and a striking cap 150 for making the ink filling tube 130 and the ballpoint pen tip 140 rise or fall in a vertical direction, wherein, a lower body 112 of the housing 110 consists of a single tube, and forms a tip erasing body 120 on the outer surface of the lower body 112;the tip erasing body 120 is part of the lower body 112 and is obtained by using a double-injection mold on the outer surface of the lower body 112, resulting in a single integral body with the lower body 112; the synthetic resin component of the tip erasing body 120 forms a chemical bond with the synthetic resin component of the lower body 112, while the tip erasing body 120 is bonded to the outer surface of the lower body 112; and the tip erasing body 120 is characterized in that it does not create any distance G when cooperating with the lower body 112. The present invention does not require the manual assembly of the tip erasing body and the lower body, so that the manufacturing process is simple and the productivity is greatly improved.;

Description

Title of the invention: A WRITING INSTRUMENT FOR ERASING CONTENTS MANUSCRIPT CONTEXT OF THE INVENTION . Field of the invention

[0001] The present invention relates to a writing instrument capable of erasing handwritten content and, more particularly, to a writing instrument capable of easily erasing the content when a user of the writing instrument writes or draws a word, symbol or shape using the writing instrument without changing hands. Description of the prior art

[0002] People use writing instruments to express their thoughts and / or feelings. The most representative writing instrument may be the ballpoint pen. A ballpoint pen can be abbreviated as a ballpoint pen. The ballpoint pen has a tube filled with viscous ink that allows predetermined words to be written or predetermined figures to be drawn on the paper.

[0003] The ballpoint pen has long been used as an everyday writing instrument, very cheap, reliable and inexpensive to buy and use, and has almost been replaced by today's fountain pen. Unlike the fountain pen, the user does not need to fill it with ink separately, and it is not only possible to choose and use ink of different colors, but it is found everywhere, as it is very cheap and easy to use.

[0004] However, the ballpoint pen has one drawback: it is difficult to erase words drawn in pencil, as well as predetermined numbers or shapes on the surface of a handwriting medium, such as paper.

[0005] To overcome these drawbacks, an erasable ballpoint pen has appeared. The operating principle of today's erasable ballpoint pen uses the process using heat obtained by friction and the process using frictional force.

[0006] The method using the above friction heat involves writing words or shapes on paper using thermal ink and fading the color of the thermal ink by the friction heat so that the above-mentioned words or shapes are no longer visible (see Patent Document 1).

[0007] This conventional method using heat obtained by friction consists of attaching a plastic eraser to the opposite end of the ballpoint pens, rubbing the aforementioned plastic eraser on the aforementioned text or figure to cause a friction between them, and to use the heat obtained by friction generated to change the color of the aforementioned thermal ink.

[0008] However, in the case of the conventional method using heat obtained by friction, a separate elastomer eraser had to be attached or combined with the opposite end of the ballpoint pen tip to generate heat by friction. In addition, with the conventional method using heat obtained by friction, the main body of the writing instrument had to be reversed to erase incorrect expressions, so the correction work had a significant disadvantage, with the major risk of letting an idea, feeling or plot slip through under the inspiration of the moment. In addition, the use of the aforementioned elastomer eraser produces eraser residue that contaminates the environment, its volume is reduced due to wear, and the aforementioned elastomer eraser cannot be used later, thus preventing its permanent use.

[0009] On the other hand, the method using the friction force described above does not use the thermal discoloration ink described above, but an adhesive ink having a certain adhesive force on the writing medium. To erase already written words or shapes, the user must place an eraser on the written words or shapes, rub the words or shapes with the eraser, press hard on the words or shapes written in the adhesive ink on the paper and erase them.

[0010] The friction force method has recently come into being through the work of the present inventors, and a front erasing body composed mainly of polypropylene resin is formed in front of the front end of the ballpoint pens, and the adhesive ink is peeled off from the backing paper using the front erasing body. (See Patent Document 2 and Patent Document 3).

[0011] However, it appears that the method using the friction force of the prior art still presents at least three technical problems.

[0012] First of all, the mechanical coupling method should be improved. As clearly shown in Figures 2a to 2c, the prior art of the present inventors relies on the lower body 112 and the tip erasing body 120' separately. Then, the tip erasing body 120' had to be inserted into the lower body 112, and the tip erasing body 120' had to be fixed to the front end of the lower body 112. Therefore, in the prior art, the tip erasing body 120' and the lower body 112 had to be manually assembled or mechanically combined, so that the work was delicate and tedious, not to mention very low productivity.

[0013] Secondly, the weakening of the support of the entire body of the ballpoint pens has been observed. As clearly shown in Figures 2a to 2c, the prior art of these inventors was to insert and fix the cylindrical tube of the tip eraser body 120' inside the cylindrical tube of the lower body 112, so that the thickness of the lower body 112 had to be relatively thinner than before. Therefore, the prior art caused the external shape support of the lower body 112 to be weakened, not to mention that users lacked stability compared to the prior art when holding the ballpoint pens.

[0014] Third, the unstable coupling relationship of the tip eraser body 120' connected to the lower body 112 had to be solved. The prior art developed by the present inventors is to contact the tip eraser body 120' on the incorrect word W, etc., and move the tip eraser body 120' over the unwanted content several times in the left and right direction, so that the unwanted content is detached from the paper P. However, when the user applies force to the tip eraser 120' and moves it in the left and right directions, the resistance acts in the opposite direction to the friction force, which further increases the distance G between the tip eraser 120' and the lower body 112, with uncertain results.Therefore, when the user uses the writing instrument according to the prior art, a distance G between the erasing body of the front tip 120' and the lower body 112 is created, and given this distance G, erasing by the writing instrument is quite delicate.

[0015] The prior art documents studied by the inventors so far are as follows:

[0016] Korean Patent No. 10-2179179 (filing date: November 10, 2020);

[0017] Korean Patent No. 10-2400822 (filing date: May 28, 2022);

[0018] Korean Patent No. 10-2400821 (filing date: May 28, 2022). Summary of the invention

[0019] 1. Technical problem#

[0020] The present invention relates to a writing instrument having a function for erasing handwritten content, making it possible to directly erase the content written on a writing medium in a writing direction without changing the direction of the writing instrument when a user of the writing instrument intends to erase the written content.

[0021] Furthermore, the object of the present invention is to solve the problems of the prior art and provide a writing instrument with a writing function which simplifies the combination of the front tip erasing body and the lower body, without decreasing the overall strength of the above lower body, while suppressing the distance resulting from the combination of the front tip erasing body and the above lower body. 2. Technical solution

[0022] A writing instrument according to the present invention comprises: a housing enclosing an upper body and a lower body in the form of a hollow tube; an ink filling tube containing ink inside the housing; a ballpoint pen tip causing the adhesive ink to flow onto the paper for writing; and a striking cap for causing the ink filling tube and the ballpoint pen tip to rise or fall in a vertical direction, wherein the lower body consists of a single tube and constitutes a tip erasing body on the outer surface of the lower body; the tip erasing body is part of the lower body and is formed by a double-injection mold on the outer surface of the lower body, thereby imparting an integral shape with the lower body;the synthetic resin component of the tip erasing body provides a chemical bond with the synthetic resin component of the lower body, while the tip erasing body is connected to the outer surface of the lower body; further, the tip erasing body is characterized in that it does not create any distance when cooperating with the lower body. ;

[0023] In the present invention, preferably, the synthetic resin component of the tip erasing body 120 is composed of 9 to 12 parts by weight of hydrogenated styrene isoprene butadiene block copolymer, 20 to 25 parts by weight of hydrotreated heavy paraffin, 0.4 to 1.2 parts by weight of 1,2,3 benzotriazole, 0.2 ~ 0.8 parts by weight of zinc distearate, 2.4 to 5 parts by weight of polyethylene, 22 to 26 parts by weight of polypropylene, and 30 to 46 parts by weight of ethylene-propylene copolymer.

[0024] In the present invention, the tip erasing body 120 is preferably shaped as multiple protrusions irregularly in an outer direction on an outer peripheral surface of the lower body 112.

[0025] In the present invention, if it is desired to color the erasing body of the tip 120, it is preferable to add 0.002 to 0.02 parts by weight of a pigment relative to the total weight. 3. Beneficial effects

[0026] Since the nib erasing body is an integral part of the body of the writing instrument, there is no need to attach and use a separate elastomeric eraser.

[0027] Furthermore, the present invention does not require manually assembling the tip erasing body and the lower body or going through the assembly process mechanically, so that the manufacturing process is simple and the productivity is greatly improved.

[0028] Furthermore, in the absence of a distance between the lower body and the tip erasing body, the present invention has the advantage of protecting the tip erasing body at the front by varying the distance depending on the use. Brief description of the drawings

[0029] [Fig.l] is a conceptual view of an earlier writing instrument.

[0030] Figures 2a to 2c are conceptual views of a scheme for erasing handwritten content using heat obtained by friction in the prior art.

[0031] Figures 3a to 3e are sectional views schematically illustrating preferred embodiments of the tip erasing body according to the present invention.

[0032] [Fig.4] is a conceptual view showing a state in which words are written on the surface of a writing medium using the writing instrument according to the present invention.

[0033] [Fig.5] is a conceptual view illustrating erasure of words, which are handwritten contents on the surface of a writing medium, using a writing instrument according to the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENT

[0034] The present invention will be described hereinafter in more specific and detailed manner. The specific numerical values ​​or specific examples provided herein are preferred embodiments of the present invention and only serve to explain in more detail the technical idea of ​​the present invention, and it is clear that the present invention is not limited thereto.

[0035] In the present invention, the front or tip is a portion where the tip of a ballpoint pen is located in a writing instrument, i.e., a direction of the tip of the ballpoint pen coming out of or entering the writing instrument, and the rear is the direction opposite to the front, i.e., a direction where the tip of the writing instrument is located.

[0036] Furthermore, the writing instrument contains a fountain pen or a ballpoint pen, and the ballpoint pen can be considered as the writing instrument best able to implement the technical idea of ​​the present invention.

[0037] Further, in the specification of the present invention, detailed descriptions of parts known in the art and which can be readily deduced by those skilled in the art will be omitted.

[0038] The present invention provides a writing instrument 100 which has the function of erasing poorly written words W on the surface of a writing medium P. The writing medium P may be paper, and the word W written or drawn on the paper of the writing medium comprises letters, numbers, symbols and images.

[0039] The present invention relates to a writing instrument 100 having a function of erasing handwritten content, and includes a ballpoint pen, a foundation pen, an ink pen, etc. In the present invention, for ease of description, the ballpoint pen will be described as a representative example of the writing instrument 100.

[0040] [Fig. 1] is a diagrammatic model of a writing instrument in the related art.

[0041] The ballpoint pen comprises a housing 110 comprising an upper body 111 and a lower body 112 in the form of a hollow tube. The housing 110 constitutes the exterior of the ballpoint pen and may consist of a single body or of the upper body 111 and the lower body 112, as illustrated in the accompanying drawings.

[0042] The ballpoint pen includes an ink filling tube 130 inside the housing 110. The ink filling tube 130 is filled with ink, and the ink is used to write or trace a predetermined word W on the paper P.

[0043] The ballpoint pen includes a ballpoint pen tip 140 at the end of the ink filling tube 130. The ballpoint pen tip 140 includes a spherical ball that allows ink to flow onto the paper P to write the word W. The ballpoint pen may include a spring 152 having a resilient force, which spring is mounted between the outside of the ballpoint pen tip 140 and the inside of the lower body 112. The spring 152 acts on the ink filling tube 130, which produces a resilient force so that the ink filling tube 130 is pushed upward in a direction opposite to the ballpoint pen tip 140.

[0044] The ballpoint pen includes a cap 150 at the rear end of the ink filling tube 130. The cap 150 causes the ballpoint pen tip 140 coupled to the tip of the ink filling tube 130 to descend, and the word W is written or an image is drawn on the paper P using the ballpoint pen tip 140, when a user presses the cap 150. The ballpoint pen 140 exits through an exit hole 113 of the housing 110 or enters the interior of the housing 110 through the exit hole 113.

[0045] The present invention is an improvement of the prior art of the present inventors.

[0046] The prior art refers to the aforementioned Korean Patent Registration Nos. 10-2400822 and 10-2400821. The prior art can erase a miswritten word W by lightly pressing the erasing body 120' on the word W written on the paper P and rubbing the erasing body 120' horizontally, as shown in Figures 2a and 2b. However, the erasing body 120' of the prior art remains coupled to the lower body 112 by a mechanical system. Therefore, the writing instrument of the prior art had the three disadvantages mentioned above.

[0047] The present invention provides a technical means for overcoming the disadvantages of the prior art writing instrument.

[0048] The present invention provides the lower body 112 as a single tube, with the same thickness as a typical lower body. Thus, the reduction in the overall external strength of the writing instrument related to the method of manufacturing the writing instrument by the prior art of the present inventors in a thin lower body 112 and a thin tip erasing body 120' is compensated for and avoided.

[0049] With the present invention, a tip erasing body 120 is formed at the front of the lower body 112, but the tip erasing body 120 is at the outer surface of the lower body 112. The tip erasing body 112 has the function of erasing a miswritten word W on the paper P. The front tip erasing body 120 is at the outer surface of the lower body 112, but the front tip erasing body 120' according to the prior art is provided at the front end of the lower body 112.

[0050] According to the present invention, the tip erasing body 120 is formed integrally with the outer surface of the lower body 112. This means that the tip erasing body 120 and the lower body 112 are distinct in shape when viewed from the outside, but the two components constitute a single component and are used as such. In order for the tip erasing body 120 and the lower body 112 to be in an integral shape, it is preferable to use a double injection molding method.

[0051] Thus, the writing instrument according to the present invention relies on a chemical manufacturing process of the erasing body of the tip 120 and the lower body 112 to obtain a single piece, whereas the writing instrument according to the prior art uses the physical assembly of two pieces to each other. In this respect, the form of the connection and the connection method are completely different.

[0052] Furthermore, since the writing instrument according to the present invention uses the tip erasing body 120 and the lower body 112 as a single piece, there is no distance G separating them, whereas in the case of the prior art, there is inevitably a distance G between the tip erasing body 120' and the lower body 112.

[0053] In the present invention, it is preferable that the tip erasing body 120 is located on the outer surface of the lower body 112, by means of a double-injection molding method. The double-injection molding method comprises firstly filling the synthetic resin raw material of the lower body 112 inside a molding device, then filling the synthetic resin raw material of the tip erasing body 120, and finally forming, cooling and removing the double-injection molded product. In the present invention, since the tip erasing body 120 and the lower body 112 are double-injection and molded within a molding device, it is not necessary to mechanically combine the tip erasing body 120 and the lower body 112.

[0054] According to the present invention, during the process of double injecting the tip erasing body 120 into the lower body 112, the tip erasing body 120 forms a strong chemical bond with the surface of the lower body 112.

[0055] In the present invention, the component of the tip erasing body 120 must have a bonding force with the polypropylene resin, the main raw material of the lower body 112, and at the same time, provide the frictional force necessary to erase the word W depicted on the paper P. In this regard, the components of the tip erasing body 120 of the present invention contain a different polymer composition than the components of the tip erasing body 120' of the prior art.

[0056] In the present invention, the polymer composition forming the tip erasing body 120 may be composed of 9-12 parts by weight of a hydrogenated styrene isoprene butadiene block copolymer, 20-25 parts by weight of hydrotreated heavy paraffin, 0.4-1.2 parts by weight of 1,2,3 benzoletriazole, 0.2-0.8 parts by weight of zinc distearate, 2.4-5 parts by weight of polyethylene, 22-26 parts by weight of polypropylene and 30-46 parts by weight of ethylene-propylene copolymer.

[0057] Based on the total weight, the tip erasing body 120 may contain 9 to 12 parts by weight of a hydrogenated styrene-isoprene-butadiene block copolymer. The hydrogenated styrene-isoprene-butadiene block copolymer imparts a predetermined flexibility to the tip erasing body 120. When the hydrogenated styrene-isoprene-butadiene block copolymer is contained in an amount of 9 parts by weight or less, the flexibility is low, while when it is contained in an amount of 12 parts by weight or more, the strength of the tip erasing body 120 is weakened, which is not better.

[0058] The erasing body of the tip 120 may comprise 20 to 25 parts by weight of hydrotreated heavy paraffin relative to the total weight. The paraffin serves to impart a predetermined contact surface roughness to the erasing body 120. It is difficult to erase smooth writing when the hydrotreated heavy paraffin component is less than 20 parts by weight, while the surface roughness of the erasing body of the tip 120 becomes too large when the hydrotreated heavy paraffin component is more than 25 parts by weight.

[0059] The tip erasing body 120 may comprise 0.4 to 1.2 parts by weight of 1,2,3 benzoltriazole relative to the total weight. The 1,2,3 benzoltriazole functions as an antioxidant. When the antioxidant is used in an amount equal to or less than 0.4 parts by weight, the oxidation prevention function may not be properly ensured, whereas when ... or more than 1.2 parts by weight, the oxidation prevention function does not increase proportionally to the amount, and therefore there is no need to add more.

[0060] The tip erasing body 120 may comprise 0.2 to 0.8 parts by weight of zinc distearate relative to the total weight. The zinc distearate plays a role in improving the fluidity of the double melt injection molding process. This is because the double melt injection must flow along the upper surface of the lower body 112 to obtain the shape of the tip erasing body 120, so if the fluidity is not good, it is impossible to create a tip erasing body 120 within the standards. When the zinc distearate is less than or equal to 0.2 parts by weight, the fluidity of the melt is not good, while when the zinc distearate is injected in an amount equal to or greater than 0.8 parts by weight, the fluidity of the melt may be excessive and give poor results.

[0061] The tip erasing body 120 may comprise from 2.4 to 5 parts by weight of polyethylene based on the total weight. Polyethylene has a double bond structure between a carbon atom and a carbon atom, which gives it the flexibility of a polymer resin. Polyethylene serves as a binder for the ethylene-polypropylene copolymer shown below. When the polyethylene is provided in an amount of 2.4 parts by weight or less, the bonding strength between the polyethylene and the ethylene-polypropylene copolymer is weak, but when the polyethylene is added in an amount of 5 parts by weight or more, the bonding strength does not increase proportionally to the amount introduced.

[0062] The tip erasing body 120 may comprise 22 to 26 parts by weight of polypropylene relative to the total weight. The above polypropylene is necessary to maintain the strength of the tip erasing body 120 above and at the same time ensure bonding strength with the polypropylene resin, the main raw material of the lower body 112 above. It is generally present in a range of 22 to 26 parts by weight, but may vary slightly within the lower limit range and within the upper limit range depending on the content of each component listed above.

[0063] The tip erasing body 120 may comprise from 30 to 46 parts by weight of the ethylene-propylene copolymer relative to the total weight. The ethylene-propylene copolymer comprises both a propylene component and an ethylene component in its molecular structure, and can therefore provide a bonding force with the polypropylene polymer component on the one hand and a bonding force with the polyethylene polymer component on the other hand. Indeed, the tip erasing body 120 according to the present invention is obtained by a double-injection mold at the outer surface of the lower body 112, so that the coupling force with the lower body 112 is of prime importance. When the ethylene-propylene copolymer is contained in a amount equal to or less than 30 parts by weight, the bonding strength is weak, while when the ethylene-propylene copolymer is an amount equal to or greater than 46 parts by weight, the bonding strength is sufficient, but the strength of the tip erasing body 120 is reduced.

[0064] In the present invention, in order to enable users to more easily distinguish the erasing body from the tip 120, 0.002 to 0.02 parts by weight of pigment may be added, preferably relative to the total weight. The pigment colors a plastic molding and can be commonly used in this technical field.

[0065] In the context of the present invention, it is desirable that the tip erasing body 120 include a number of protrusions formed to project outwardly from the outer peripheral surface of the lower body 112.

[0066] Figures 3a to 3e, attached hereto, show the formation of a plurality of bulges in a sectional view. [Fig. 3a] shows that the tip erasing body 120 is formed of two protrusions, [Fig. 3b] shows that the front tip erasing body 120 is formed of three protrusions, [Fig. 3c] shows that the tip erasing body 120 is formed of four protrusions, [Fig. 3d] shows the tip erasing body 120 formed of six protrusions, and [Fig. 3e] shows the tip erasing body 120 completely surrounding the outside of the lower portion of the body 112.

[0067] The present invention relates to a writing instrument which can immediately erase contents such as incorrectly written words on the paper P using the erasing body of the tip 120, and the adhesive ink introduced in the prior art can be used.

[0068] The present invention, with such a configuration, makes it possible to perfectly and immediately erase content that one wants to delete.

[0069] [Fig.4] is a conceptual view illustrating a state in which the words W are written on the surface of a writing medium P using the writing instrument 100 of the present invention, [Fig.5] is a conceptual view illustrating a state of erasing the words W, which are handwritten contents on the surface of a writing medium P, using the writing instrument 100 of the present invention.

[0070] A person wishing to use the writing instrument 100 according to the present invention can use a writing instrument to write something W on the paper P.

[0071] If the user wishes to erase the erroneous word W, he / she only needs to touch the erasing body of the aforementioned tip 120 while holding the writing instrument, then lightly press the erasing body of the aforementioned tip 120 and move it back and forth in the left and right directions. The misspelled W word then detaches and falls off the P paper. It has simply disappeared.

[0072] Although the writing instrument having the function of erasing handwriting content according to the present invention has been specifically introduced above, this is only specified in the process of explaining the embodiment of the present invention, and all features of the present invention should not be construed as applying only to the above-mentioned elements.

[0073] Furthermore, those skilled in the art may make various modifications and the like in accordance with the description of the present invention, but within the scope of the present invention.

Claims

Claims

1. A writing instrument having a function of deleting handwritten content, comprising: a hollow tube-shaped housing 110; an ink filling tube 130 containing adhesive ink inside the housing; a ballpoint pen tip 140 flowing the adhesive ink onto the paper P to write words W; and a striking cap 150 for moving the ink filling tube 130 and the ballpoint pen tip 140 up or down in a vertical direction, wherein a lower body 112 of the housing 110 is made of a single tube and forms a tip erasing body 120 at the outer surface of the lower body 112; wherein the tip erasing body 120 is made of a synthetic resin and wherein the lower body 112 is made of a synthetic resin;the tip erasing body 120 is part of the lower body 112 and is obtained by using a double-injection mold at the outer surface of the lower body 112, thereby obtaining a single integral body with the lower body 112; the synthetic resin component of the tip erasing body 120 forms a chemical bond with the synthetic resin component of the lower body 112, while the tip erasing body 120 is bonded to the outer surface of the lower body 112; and the tip erasing body 120 is characterized in that it does not create any distance G, between the tip erasing body 120 and the lower body 112, when it cooperates with the lower body 112.;

2. A writing instrument having a function of erasing handwritten content according to claim 1, wherein the nib erasing body 120 comprises multiple protrusions which are irregularly formed in an outward direction on an outer peripheral surface of the lower body 112.

3. A writing instrument having a function of removing handwritten content according to claim 2, wherein the synthetic resin of the tip erasing body 120 is composed of 9 to 12 parts by weight of styrene isoprene block copolymer

4. hydrogenated butadiene, 20 to 25 parts by weight of hydrotreated heavy paraffin, 0.4 to 1.2 parts by weight of 1,2,3 benzotriazole, 0.2 ~ 0.8 parts by weight of zinc distearate, 2.4 to 5 parts by weight of polyethylene, 22 to 26 parts by weight of polypropylene, and 30 to 46 parts by weight of ethylene-propylene copolymer. A writing instrument having a function of erasing handwritten content according to claim 3, wherein the nib erasing body 120 is added with 0.002 to 0.02 parts by weight of a pigment relative to the total weight.

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