Multi-color notepads

Abstract

To provide a multicolor writing instrument capable of drawing writing lines of various patterns by combining at least two core bodies having the same shape when writing, in which a vertical force applied to an external tangential line is transferred to the outside due to the inclination of a joint surface and a pen core does not swell when normal writing is performed.MEANS FOR SOLVING THE PROBLEM: A multicolor writing instrument includes at least two cores, in which the at least two cores are joined together to form a single tip. A joint surface represented by joining the two cores includes a first joint surface orthogonal to a pair of opposing external tangents and parallel to the other pair of opposing external tangents, and a second joint surface parallel to the pair of opposing external tangents and orthogonal to the other pair of opposing external tangents lines.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to writing instruments such as felt-tip pens, felt-tip pens, and marking pens, and more particularly to writing instruments that use a single tip formed by two ink-impregnated cores. In this invention, "upper" refers to the pen core tip side, and "lower" refers to the ink tail cap side. [Background technology]

[0002] Conventionally, the core of a felt-tip pen or the like made of ink-impregnated nonwoven fabric has been capable of drawing only a single line corresponding to the thickness of the core, and the line has little variation. For example, Patent Document 1 proposes a multi-color felt pen that has a single tip formed from multiple cores impregnated with inks of different colors, allowing multiple lines to be drawn at once. Patent Document 1 also proposes a two-color felt pen that can draw up to four different patterns of lines by combining, by gluing, two identical trapezoidal cores impregnated with inks of different colors. However, the shape of the core of the felt pen is trapezoidal on the top surface, and the joint surfaces of the two cores are inclined at an angle to a pair of opposing circumscribing lines. Therefore, when writing normally, the vertical force applied to the circumscribing lines is converted outward by the inclination of the joint surfaces, causing the pen core to bulge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3000510 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide a multi-color marker that allows writing lines of a variety of patterns to be drawn by combining at least two lead bodies of the same shape when writing, and that, when writing normally, converts the vertical force applied to the circumscribing line to the outside due to the inclination of the joining surface, preventing the pen lead from expanding. [Means for solving the problem]

[0005] The invention described in claim 1 is a multicolor writing instrument having at least two cores and a single tip formed by joining the at least two cores, characterized in that the joining surface formed by joining the two cores comprises a first joining surface that is perpendicular to a pair of opposing circumscribing lines and parallel to another pair of opposing circumscribing lines, and a second joining surface that is parallel to the pair of opposing circumscribing lines and perpendicular to the other pair of opposing circumscribing lines. As a result, the force acting perpendicular to the circumscribing lines is not converted outward by the joining surface having an inclination angle, so the pen core does not swell and deform, and the writing line does not become distorted. The invention described in claim 2 is the multi-color type described in claim 1, characterized in that the at least two core bodies have the same shape. This reduces the number of parts compared to manufacturing core bodies with different shapes, thereby reducing manufacturing costs. The invention described in claim 3 is the multicolor writing instrument described in claim 1 or 2, characterized in that at least a part of the joining surface of the at least two cores is shielded via a shielding portion. This makes it possible to omit the process of applying adhesive to the joining surface and bonding the cores together. [Effects of the Invention]

[0006] The multicolor marker of the present invention allows for the drawing of a variety of patterns of lines while keeping manufacturing costs low. Furthermore, during normal writing, the vertical force applied to the circumscribing line is not converted outward due to the inclination of the joining surface, so the pen tip does not swell and deform, preventing the writing line from becoming distorted. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view of the appearance of a felt-tip pen according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top view of a felt-tip pen according to an embodiment of the present invention. [Figure 3] 1 is a diagram showing the top surface of a core portion of a felt-tip pen according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a felt-tip pen according to an embodiment of the present invention; [Figure 5] 1 is a cross-sectional view of a felt-tip pen according to an embodiment of the present invention; [Figure 6] FIG. 1 is a top perspective view of a felt-tip pen core according to an embodiment of the present invention. [Figure 7] FIG. 2 is a top perspective view of a core portion of a felt-tip pen according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing the top surface of a core portion of a felt-tip pen according to a conventional embodiment. [Figure 9] FIG. 10 is a diagram showing the top surface of the core portion of a felt-tip pen body in another embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the top surface of the core portion of a felt-tip pen body in another embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing the top surface of the core portion of a felt-tip pen body in another embodiment of the present invention. [Figure 12] FIG. 10 is a diagram showing the top surface of the core portion of a felt-tip pen body in another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described below. Fig. 1 is a perspective view of the appearance of a felt-tip pen according to an embodiment of the present invention. Fig. 2 is a top view of the felt-tip pen according to an embodiment of the present invention. Fig. 3 is a view showing the top view of a core portion of the felt-tip pen according to an embodiment of the present invention. Fig. 4 is a cross-sectional view taken along line AA of the felt-tip pen according to an embodiment of the present invention. Fig. 5 is a cross-sectional view taken along line BB of the felt-tip pen according to an embodiment of the present invention. Fig. 6 is a top perspective view of a felt-tip pen core according to an embodiment of the present invention. Fig. 7 is a top perspective view of the core portion of a felt-tip pen according to an embodiment of the present invention. Fig. 8 is a diagram showing the top surface of the core portion of a felt-tip pen according to a conventional embodiment. Figs. 9 to 12 are diagrams showing the top surface of the core portion of a felt-tip pen body according to another embodiment of the present invention.

[0009] 1 is a perspective view of the appearance of a felt-tip pen according to an embodiment of the present invention. The felt-tip pen 30 includes a cylindrical main body 1 with both ends open, two ink-impregnated cores made of felt material, a first core 7a and a second core 7b, and a first absorbent body 11a and a second absorbent body 11b. The first absorbent body 11a and the second absorbent body 11b are arranged so as to contact the lower ends of the first core 7a and the second core 7b, respectively, and have semicircular bottom surfaces that supply ink to the first core 7a and the second core 7b, respectively, by the contact. The linear portions of the semicircles are bonded together to form a cylindrical shape. The semicircular straight line portion where the first and second absorbents 11a and 11b are bonded together is provided with a partition plate 12 having an approximately rectangular parallelepiped shape, which is arranged to separate the two absorbents vertically and prevent ink transfer between them; a shielding portion 15 which is arranged between the joint surface formed by joining the first and second cores 7a and 7b and separates them vertically, preventing ink transfer between the cores; and a tail plug 13 which is arranged at the bottom end of the main body 1 and fits into the main body 1 to prevent ink leakage from the bottom end.

[0010] Fig. 2 is a top view of a felt-tip pen according to an embodiment of the present invention, and Fig. 4 is an AA cross-sectional view of the felt-tip pen according to an embodiment of the present invention. The main body 1 has a hollow cylindrical shape with both ends open, and a tail plug 13 is fitted into the opening at the bottom end. A first step 2 and a second step 3 are formed at the top end of the main body 1. The inner diameter of the main body 1 is narrowed inward at the first step 2, and the inner diameter is further narrowed inward at the second step 3, so that the outer diameter of the felt-tip pen main body 1, the inner diameter narrowed by the first step 2, and the inner diameter narrowed by the second step 3 are concentric in a top view. The two core bodies are fitted and fixed together by inserting the ink guide portions 8a and 8b of the core body, which will be described later, into the two semicircular gaps formed by the core body fitting portion 5, which is approximately cylindrical and extends from the first step portion 2 to the second step portion 3 in the main body 1, and the partition plate 12. Furthermore, the core fitting portion 5 is provided with a main body protrusion 6 that extends outward from the circumferential outer diameter of the core fitting portion 5, and the main body protrusion 6 engages with a protrusion (not shown) that extends circumferentially inward from near the bottom end of the cap, thereby maintaining airtightness within the space formed by the portion of the core fitting portion 5 above the main body protrusion 6 and the inside of the cap. Note that the writing instrument used in the present invention does not need to have an airtight configuration with a cap that opens and closes by fitting as described above, and a writing instrument with a known knock-type capless mechanism may also be used.

[0011] Figure 6 is a top perspective view of a felt-tip pen core according to an embodiment of the present invention. The core 2 has a generally L-shaped top periphery, with a writing section 9a that forms an inclined surface 14 that widens outward like an umbrella as it moves downward from the top, and an ink guide section 8a that is generally prism-shaped and connects to the bottom of the writing section 9a at the approximate center. A rounded tapered section 10 is provided on the periphery of the top surface of the writing section 9a. 5 is a B-B cross-sectional view of a felt-tip pen according to an embodiment of the present invention. The difference α between the width of the bottom surface of the lower end of the writing portion of the first core 7a and the second core 7b and the width of the top surface of the upper end of the ink guide, which is created by the inclined surface 14, restricts the up and down movement of the writing portion at the second step 3 of the main body 1, preventing the core from falling out toward the lower end of the main body 1. Although the writing part 9a of this embodiment is provided with the inclined surface 14, it may have the same shape as the outer periphery of the ink guide, which is approximately prismatic, and extend upward from the ink guide part, without providing the inclined surface 14. In this case, it is desirable to provide a protrusion or the like extending circumferentially on the outer periphery of the ink guide part to fix the pen core and main body 1 to the side of the writing part 9a, but providing the inclined surface 14 is more preferable because it reduces wobble of the core body during writing. The core is made of a felt material with fine pores, and when the rear end of the ink guide portion 8a of the first core 7a is immersed in the first absorbent body 11a, the ink impregnated in the first absorbent body 11a is sucked up by capillary action into the ink guide portion 8a of the first core 7a and the writing portion 9a. The second core 7b has the same shape as the first core 7a, and like the first core 7a, the ink impregnated in the second absorbent body 11b is sucked up into the ink guide portion 8b of the second core 7b and the writing portion 9b. The first core 7a and the second core 7b are fixed to the main body 1 by fitting the ink guide portion 8a (first core) and the ink guide portion 8b (second core) into the gap formed by the core fitting portion 5 and the partition plate 12. Note that the absorber does not need to be a writing instrument ink impregnated body such as nonwoven fabric or felt, and a known ready-to-use ink mechanism that stores ink in an ink tank without using an impregnated body may also be used.

[0012] Figure 3 is a diagram showing the top surface of a core portion of a felt-tip pen according to an embodiment of the present invention. Felt-tip pen 30 according to this embodiment has circumscribing lines 16a, 16b, 16c, and 16d on the top surface of the core. Furthermore, in the present invention, the circumscribing lines refer to the respective line segments 16a-16d formed by the outer side of the top surface of the writing implement, and the circumscribing lines of a pair of opposing cores refer to a pair of circumscribing lines facing each other, such as the pair of circumscribing lines 16a and 16c or the pair of circumscribing lines 16b and 16d in Figure 4. When writing, a line is written by bringing the portion of the writing part near the circumscribing lines into contact with a writing object such as paper. When the surface on the circumscribing line 16a side is brought into contact with a writing object to draw a line, the ink impregnated in the first core 7a and the second core 7b is written on the paper, with the ink impregnated in the first core 7a writing a bold line and the ink impregnated in the second core 7b writing a thin line on the writing object, such as paper. When the surface on the circumscribing line 16b side is brought into contact with a writing object to draw a line, only the ink impregnated in the first core 7a is written on the paper. When the surface on the circumscribing line 16c side is brought into contact with a writing object to draw a line, the ink impregnated in the first core 7a and the second core 7b is written on the paper, with the ink impregnated in the first core 7a writing a thin line and the ink impregnated in the second core 7b writing a bold line on the writing object. When the surface on the circumscribing line 16d side is brought into contact with the writing object and a writing line is drawn, only the ink impregnated in the second core 7b is written on the writing object, and the two-color marker of this embodiment can draw up to four patterns of writing lines. With the writing instrument of this embodiment, by selecting any of the surfaces near the circumscribing lines 16a to 16d as the part to be brought into contact with the writing object, a wide variety of writing lines can be drawn.

[0013] The felt-tip pen 30 in this embodiment has a first bonding surface 17a, a first bonding surface 17b, and a second bonding surface 18a on the top surface of the upper side of the lead. The bonding surface in this invention is a surface formed by joining two lead bodies, and is the boundary surface where the two lead bodies come into contact or face each other due to the joining of the two lead bodies. Note that the bonding surface does not necessarily require the two lead bodies to be in contact with each other, and they may be spaced apart and facing each other. The first bonding surface refers to a bonding surface whose extension is perpendicular to a pair of opposing circumferential lines (16a, 16c) and parallel to another pair of opposing circumferential lines (16b, 16d). The second bonding surface refers to a bonding surface whose extension is parallel to the pair of opposing circumferential lines (16a, 16c) and perpendicular to the other pair of opposing circumferential lines (16b, 16d). Specifically, the second bonding surface refers to a bonding surface whose extension is perpendicular to the other pair of opposing circumferential lines (16b, 16d) and parallel to the other pair of opposing circumferential lines (16a, 16c). In this embodiment, the first bonding surface 17a, the second bonding surface 18a, and the first bonding surface 17b are connected to each other in this order. Furthermore, in this embodiment, shielding portions 15 connected by the partition material 12 are arranged on the first bonding surface 17a, the first bonding surface 17b, and the second bonding surface 18a, which are represented by joining the first core body 7a and the second core body 7b. However, it is not necessary to arrange the shielding portions 15 on the entire surface of all bonding surfaces. For example, the shielding portions 15 may be arranged only on the second bonding surface 18a, which is parallel to the directions of the circumscribing lines 16a and 16c within the first bonding surface 17a, the first bonding surface 17b, and the second bonding surface 18a, while the shielding portions 15 may not be arranged on the first bonding surface 17a and the first bonding surface 17b, which are parallel to the circumscribing lines 16b and 16d. Alternatively, the shielding portions 15 may be arranged only in the approximate center of the first bonding surface 17b, for example, and not at the ends of the first bonding surface 17b. In addition, it is also possible to apply a known adhesive to the joint surfaces of the first core body 7a and the second core body 7b and fit them together without using the shielding portion 15, but from the standpoint of work efficiency, it is preferable to use a configuration with the shielding portion 15.

[0014] FIG. 7 is a top perspective view of the core portion of a felt-tip pen 30 according to an embodiment of the present invention. In the felt-tip pen 30 of this embodiment, the core portion includes a joint surface and an extended surface. The extended surface refers to a plane extending from the joint surface defined by the joining of two cores and coplanar with the joint surface. In this embodiment, the extended surface 20a of the first joint surface 17a is perpendicular to the circumscribing line 16a, and the extended surface 20b of the first joint line 17b is perpendicular to the circumscribing line 16b. The second joint surface 18a is not tangent to any of the circumscribing lines, and the extended surface 21a of the second joint surface 18a is perpendicular to the circumscribing lines 16b and 16d.

[0015] In this embodiment, the action on the pen core during writing will be described. FIG. 8 is a diagram showing the top surface of the core portion of a felt-tip pen 30 in a conventional embodiment. The two pen cores in the conventional embodiment have the same shape as shown in the figure, and when joined together, they form a trapezoid in top view. The joining surface has an inclination angle θ with respect to the circumscribing line 16e. When attempting to write with the circumscribing line 16e of the felt-tip pen in the conventional embodiment placed against a piece of paper, pressure is applied to the core in a direction perpendicular to the circumscribing line 16e (direction A). Part of the pressure applied in direction A is converted outward (direction B) by the joining surface 22, which has an inclination angle θ. This converted force in the outward direction (direction B) can cause the core to bulge outward and deform, or cause misalignment between the two cores. Furthermore, when writing with the circumscribing line 16d of the felt-tip pen 30 of the conventional embodiment against a piece of paper, the force acting on the core is perpendicular to the circumscribing line 16d (direction B). Part of the writing force acting in direction B is converted outward (direction A) by the joint surface 19, which has an inclination angle θ. This converted outward (direction A) force can cause the core to bulge outward and deform, or cause misalignment between the two cores. On the other hand, the felt-tip pen 30 of this embodiment has the same shape as shown in the figure. When joined to form a single tip, the top surface of the tip becomes L-shaped. Furthermore, when joined, first joining surfaces 17a and 17b and second joining surface 18a are formed. The first joining surfaces 17a and 17b or their extensions 20a and 20b are perpendicular to a pair of opposing circumstantial lines 16a and 16c and parallel to another pair of opposing circumstantial lines 16b and 16d. Furthermore, extension surface 21a of second joining surface 18a is perpendicular to the pair of opposing circumstantial lines 16a and 16c and parallel to the other pair of opposing circumstantial lines 16b and 16d. When writing with the felt-tip pen 30 of this embodiment, for example, by placing the circumstantial line 16a on the paper, the force acting on the core is perpendicular to the circumstantial line 16a (direction A). First bonding surface 17a, first bonding surface 17b, and second bonding surface 18a are perpendicular or parallel to circumscribing line 16a and are also perpendicular or parallel to pressure applied in a direction perpendicular to the circumscribing line, so that the pressure applied in direction A is not converted to the outward direction (direction B) by first bonding surface 17a, first bonding surface 17b, and second bonding surface 18a. Therefore, the core body does not bulge outward and deform, and the two core bodies do not become misaligned.

[0016] In another embodiment of the present invention, as shown in Fig. 9, a recess 24 may be formed inward on a portion of the outer surface of the top surface of the writing portion of the lead. In another embodiment of the present invention, as shown in Fig. 10, for example, two leads 7a, 7b each having a generally L-shaped top surface at the tip end may be combined with each other, and similarly, two leads 7c, 7d each having a generally L-shaped top surface at the tip end may be combined with each other to create two sets of identical combined leads, and the sides of the two sets of leads may be joined together. Furthermore, as shown in Fig. 11, for example, two leads 7a, 7b each having a generally L-shaped top surface at the tip end may be combined with each other, and the sides of the combined two leads may be joined together to create a single rectangular lead 23 having a generally rectangular top surface at the tip end. Alternatively, as shown in Figure 12, the structure may include three first bonding surfaces 17a, 17b, and 17c that are parallel to a pair of opposing circumscribing lines 16b and 16d, and two second bonding surfaces 18a and 18b whose extension surfaces are perpendicular to the pair of opposing circumscribing lines 16b and 16d, with both ends of second bonding surface 18a connected to the ends of first bonding surfaces 17a and 17b, respectively, and both ends of second bonding surface 18b connected to the other end of first bonding surface 17b and the end of 17b, respectively.

[0017] The present invention has been described above in relation to the embodiment that is considered to be the most practical and preferable at this time. However, the present invention is not limited to the embodiment disclosed in the specification of this application, and can be modified as appropriate within the scope of the claims and the gist or idea of ​​the invention that can be read from the specification as a whole, and multi-color writing instruments with such modifications should also be understood to be included within the technical scope. 1 Main unit 2 First stage 3 Second Stage 4 Inner wall of second stage 5 Core body fitting part 6 Main body protrusion 7a 1st core 7b Second core 8a Ink guide section (first core) 8b Ink guide section (second core) 9a Writing part (first core) 9b Writing part (second core) 10 Tapered section 11a First absorber 11b Second absorber 12 Partition 13 tail plug 14 Slope 15 Shielding part 16a External tangent 16b External tangent 16c external tangent 16d external tangent 16e External tangent 16f external tangent 16g external tangent 16h External tangent 17a 1st joint surface 17b 1st joint surface 17c 1st joint surface 18a 2nd joint surface 18b 2nd joint surface 19 Joint surface with inclined angle 20a: extension surface of the first joining surface 17a 20b: extension surface of the first joining surface 17b 21a: extension surface of second joining surface 18a 22 Joint surface 23 Rectangular core 24 recess 30 felt-tip pens

Claims

1. At least two cores; A multi-color writing instrument in which the at least two cores are joined to form a single tip, a first joint surface defined by joining the two core bodies, the first joint surface being perpendicular to a pair of opposing circumscribing lines and parallel to another pair of opposing circumscribing lines; a second joining surface that is parallel to said pair of opposing circumscribing lines and perpendicular to said other pair of opposing circumscribing lines;

2. 2. A multi-color writing implement according to claim 1, wherein the at least two cores have the same shape.

3. 3. A multicolor writing implement according to claim 1, wherein a shielding portion is provided on at least a part of the joining surface of said at least two core bodies.

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