Writing instrument

Abstract

To provide a writing instrument that prevents the so-called "push-writing", in which the ball at the pen tip is pressed and rolled to discharge ink.SOLUTION: A writing instrument 1 includes a barrel 10 formed in a cylindrical shape and containing ink therein, a ballpoint pen tip 50, and a joint 30 connecting the barrel 10 and the ballpoint pen tip 50. The joint 30 has a first part 31 connected to one end of the barrel 10 and extending in the same direction as an imaginary line extending from the axis of the barrel 10, and a second part 32 for holding the ballpoint pen tip 50, and the first part 31 is asymmetric with respect to the imaginary line. In a side view seen from a first direction perpendicular to the imaginary line, the angle between the imaginary line and the axis of the ballpoint pen tip 50 is 110° or more and 150° or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This disclosure relates to writing instruments. [Background technology]

[0002] Regarding a ballpoint pen, which is one form of writing implement, a typical ballpoint pen is configured so that the axis of the ink reservoir, the axis of the ballpoint pen tip, and the axis of the joint connecting the ink reservoir and the ballpoint pen tip are aligned in the same straight line. When a left-handed person tries to write Japanese or English characters using such a typical ballpoint pen, the character being written may be partially or entirely hidden by the ballpoint pen being held, making it difficult to see the character being written. In order to solve such a problem, Patent Document 1 discloses a writing implement having a shaft-shaped pen tip holder and a shaft-shaped grip connected to the upper side of the shaft-shaped pen tip holder, in which the pen tip holder and the grip are connected in a crank shape, and the position of the pen tip is spaced from the axis of the grip. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-310583 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the writing implement disclosed in Patent Document 1 is applied to a ballpoint pen, it is the same as a general ballpoint pen in that the ball at the tip of the pen is pressed and rolled to eject ink, which is called push writing. When pushing writing, smooth ejection of ink may be hindered, which may cause the characters being written to become faint.

[0005] In view of the above-mentioned problems, the present disclosure relates to providing a writing instrument that suppresses pushing writing. [Means for solving the problem]

[0006] A writing instrument according to a first aspect of the present disclosure comprises a cylindrical barrel that contains ink, a ballpoint tip, and a joint that connects the barrel and the ballpoint tip, wherein the joint has a first portion that is connected to one end of the barrel and extends in the same direction as an imaginary line extending from the axis of the barrel, and a second portion that holds the ballpoint tip, wherein the first portion is asymmetric with respect to the imaginary line, and when viewed from a side view from a first direction perpendicular to the imaginary line, the angle between the imaginary line and the axis of the ballpoint tip is 110° or more and 150° or less.

[0007] With this configuration, it is possible to prevent so-called pushing writing when the writing instrument is held in the left hand and tilted at a natural angle and writing from left to right, or when the writing instrument is held in the right hand and writing from right to left.

[0008] In addition, a writing instrument according to a second aspect of the present disclosure is a writing instrument according to the first aspect of the present disclosure, wherein, when viewed in a planar view from a second direction perpendicular to the imaginary straight line and the first direction, the axis of the ballpoint tip overlaps the imaginary straight line.

[0009] With this configuration, it becomes easier to apply pressure to the tip of the ballpoint pen tip, enabling stable writing to be achieved.

[0010] A writing instrument according to a third aspect of the present disclosure is a writing instrument according to the first or second aspect of the present disclosure, wherein the joint has a first hollowed-out portion hollowed out on the side of the tip of the ballpoint pen tip when viewed from the side in the first direction.

[0011] With this configuration, the surface of the paper on which writing is being done can be seen through the first hollowed-out portion.

[0012] A writing instrument according to a fourth aspect of the present disclosure is the writing instrument according to the third aspect of the present disclosure, wherein the joint has a second hollowed-out portion hollowed out on the side along the imaginary straight line when viewed in a plan view from a second direction perpendicular to the imaginary straight line and the first direction.

[0013] With this configuration, the area in which the writing surface can be viewed can be expanded.

[0014] A writing instrument according to a fifth aspect of the present disclosure is a writing instrument according to any one of the first to fourth aspects of the present disclosure, wherein the ballpoint tip and the joint are contained inside an imaginary cylinder extending the outer wall of the barrel in the direction in which the ballpoint tip and the joint are arranged.

[0015] With this configuration, when attaching a cap to cover the ballpoint pen tip and the joint, a cap of an appropriate size that is not too large can be applied. Effect of the Invention

[0016] According to the present disclosure, it is possible to prevent so-called pushing writing when writing from left to right with a writing instrument held in the left hand and tilted at a natural angle, or when writing from right to left with the writing instrument held in the right hand. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view of a writing instrument according to an embodiment; [Diagram 2] FIG. 1A is a side view of a writing instrument according to one embodiment, and FIG. 1B is a side cross-sectional view of the writing instrument according to one embodiment. [Diagram 3] FIG. 1A is a plan view of a writing instrument according to one embodiment, and FIG. 1B is a cross-sectional plan view of the writing instrument according to one embodiment. [Figure 4] 1 is an exploded perspective view of a writing instrument according to an embodiment; [Diagram 5]1A is a side view of a joint provided in a writing instrument according to one embodiment, FIG. 1B is a plan view of the joint, FIG. 1C is a side view of the joint from the rear side, FIG. 1D is a bottom view of the joint, and FIG. 1E is a cross-sectional view taken along the line EE in FIG. [Figure 6] FIG. 2 is a partial side view showing the vicinity of a joint of the writing instrument according to the embodiment. [Figure 7] FIG. 2 is an exploded perspective view of a joint and its surroundings provided in the writing instrument according to the embodiment. [Figure 8] FIG. 1A is a side view of a writing instrument according to an embodiment with a cap attached, and FIG. 1B is a side cross-sectional view of the writing instrument according to an embodiment with a cap attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment will be described with reference to the drawings. In the drawings, the same or similar reference numerals are used to designate the same or corresponding parts, and duplicated explanations will be omitted.

[0019] First, a writing instrument 1 according to one embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a perspective view of the writing instrument 1. Fig. 2(A) is a side view of the writing instrument 1, and Fig. 2(B) is a cross-sectional side view of the writing instrument 1. Fig. 3(A) is a plan view of the writing instrument 1, and Fig. 3(B) is a cross-sectional plan view of the writing instrument 1. Fig. 4 is an exploded perspective view of the writing instrument 1. In the following description, when new figures are referred to in order to explain the details of each part constituting the writing instrument 1, those figures will also be referred to appropriately in the subsequent description.

[0020] The writing instrument 1 includes a barrel 10, a joint 30, and a ballpoint pen tip 50. In this embodiment, the writing instrument 1 is designed to prevent so-called push writing when a left-handed person writes characters such as Japanese characters or English characters in a stroke order in which the writing part is sent from left to right and from top to bottom overall, and to prevent the characters being written from becoming difficult to see. Here, the stroke order in which the writing part is sent from left to right and from top to bottom overall means a stroke order in which lines are drawn from left to right or from top to bottom in most parts of the characters to be written. In addition, push writing means writing in a manner in which the ball is pushed and rolled with the barrel 10 tilted in a writing instrument having a structure in which a ball is provided at the tip of the ballpoint pen tip 50 and the ink flows out by rolling the ball. The writing mode opposite to push writing is called pull writing, which is a writing mode in which the ball is pulled and rolled with the barrel 10 tilted. In the case of push writing, the ball does not rotate easily, and discontinuity of the ink during writing is easily generated, so the amount of ink ejected tends to be small. When the amount of ink ejected is small, the drawn lines may become thin or smudged. The writing instrument 1 is designed to prevent such inconvenience from occurring.

[0021] The barrel 10 is a cylindrically formed part that contains ink inside. The barrel 10 occupies the majority of the length of the writing instrument 1, and in this embodiment, has a length of about 0.8 to 0.9 times the length of the writing instrument 1. In this embodiment, the barrel 10 has a rear barrel 11 and a front barrel 13. The rear barrel 11 occupies the majority of the barrel 10, and typically has a length that contacts the first interdigital space (between the thumb and index finger) or its periphery (typically the base of the index finger) when the writing instrument 1 is held in the left hand in a writing mode. In this embodiment, the rear barrel 11 is formed in a hollow cylindrical shape, but the cross-sectional shape perpendicular to the cylindrical axis may be formed in a polygonal shape such as a hexagon or octagon. The rear barrel 11 typically extends straight in the longitudinal direction without changing the cylindrical outer diameter. Both end faces of the hollow cylindrical shape of the rear barrel 11 are open. The rear shaft 11 has a plurality of rows or a single row of recesses 12 (see FIG. 4) formed on the inner surface of one end of the hollow cylinder, the recesses 12 extending in the circumferential direction.

[0022] Lead barrel 13 is a component attached to the end of rear barrel 11 where recess 12 is formed. Lead barrel 13 is shorter than rear barrel 11 (in this embodiment, about 1 / 3 the length of rear barrel 11), formed in a generally cylindrical shape, and has undulations on its outer surface. Lead barrel 13 is generally cylindrical, with both end faces open. Lead barrel 13 has flange 14, which has a slightly larger outer diameter, approximately in the middle in the longitudinal direction. The outer diameter of flange 14 is typically the same as the outer diameter of rear barrel 11. Lead barrel 13 has fitting portion 15 on one end side relative to flange 14, and exposed portion 16 on the other end side. Fitting portion 15 is a portion that is fitted into the end of rear barrel 11 where recess 12 is formed. Fitting portion 15 has a protrusion formed on the outer surface thereof that fits into recess 12 of rear barrel 11. The protrusion of fitting portion 15 extends in the circumferential direction. The exposed portion 16 has an outer diameter that is smaller at a position slightly away from the flange 14 in the direction of the end face, and then the outer diameter is smaller again at a position away from that toward the end face. Each point where the outer diameter becomes smaller is inclined so that the outer diameter gradually becomes smaller as it progresses toward the end face. At the point where the outer diameter changes closest to the flange 14, a raised portion 17 is formed where the outer diameter slightly increases before becoming smaller.

[0023] The barrel 10 is configured by fitting the front barrel 13 into the rear barrel 11 until the end face of the rear barrel 11 comes into contact with the flange 14 of the front barrel 13, so that a protrusion formed on the fitting portion 15 of the front barrel 13 fits into the recess 12 of the rear barrel 11. The axis of the barrel 10 is referred to as the barrel axis 19. Inside the barrel 10, a batting 21 that holds ink is inserted. In this embodiment, the batting 21 is a porous body formed into a cylindrical shape. The batting 21, which may be a fiber bundle core, an extruded core, or the like, is immersed in ink before being inserted into the barrel 10, and the porous body absorbs the ink, thereby holding the ink. The barrel 10 with the batting 21 inserted inside has the end of the rear barrel 11 opposite the end to which the front barrel 13 is attached blocked by a tail plug 23.

[0024] The joint 30 is a part that connects the barrel 10 and the ballpoint pen tip 50. The joint 30 generally has a first part 31 and a second part 32. The first part 31 is connected to one end of the barrel 10 (the end of the front barrel 13), extends in the same direction as an imaginary straight line 39 that is an extension of the barrel axis 19, and corresponds to the first part. The second part 32 is provided at the tip of the first part 31 and holds the ballpoint pen tip 50, and corresponds to the second part. In a side view (see FIG. 2(A)), the first part 31 is asymmetric with respect to the imaginary straight line 39, and the second part 32 holds the ballpoint pen tip 50 so that the axis of the ballpoint pen tip 50 (hereinafter referred to as the "tip axis 59") intersects with the imaginary straight line 39. The side of the writing instrument 1 shown in Fig. 2(A) is one side as viewed from a direction perpendicular to the barrel axis 19 (and imaginary straight line 39), parallel to an imaginary plane including the imaginary straight line 39 and the tip axis 59, and this side is considered to be the side as viewed from a first direction. The plane shown in Fig. 3(A) is a plane as viewed from a direction perpendicular to the barrel axis 19 (and imaginary straight line 39) and perpendicular to the first direction, and this plane is considered to be the plane as viewed from a second direction.

[0025] 5(A) to 5(E) show the configuration of the joint 30 in more detail. FIG. 5(A) is a side view of the joint 30 seen from the first direction, FIG. 5(B) is a plan view of the joint 30 seen from the second direction, FIG. 5(C) is a side view of the joint 30 seen from the opposite direction to the first direction, FIG. 5(D) is a bottom view of the joint 30 seen from the opposite direction to the second direction, and FIG. 5(E) is a cross-sectional view taken along the line EE in FIG. 5(B). In FIG. 5(A) to FIG. 5(E), an imaginary straight line 39 that should be inside is shown, which helps to understand the positional relationship between the imaginary straight line 39 and each part. Hereinafter, for convenience of explanation, the side of the start point in the second direction (the upper side in the diagram shown in FIG. 5(A)) will be referred to as the "upper side", and the side of the end point in the second direction (the lower side in the diagram shown in FIG. 5(A)) will be referred to as the "lower side". In addition, the side of the starting point in the first direction (the side facing directly when writing, the lower side in the diagram shown in Figure 5(B)) will be referred to as the "front side", and the side of the ending point in the first direction (the upper side in the diagram shown in Figure 5(B)) will be referred to as the "back side".

[0026] For ease of explanation, the side of first portion 31 of joint 30, approximately halfway along the direction in which imaginary straight line 39 extends, will be referred to as extension portion 33, and the side opposite second portion 32 will be referred to as insertion portion 34. Insertion portion 34 is a portion that is inserted into front barrel 13 of barrel tube 10. Insertion portion 34 is formed into a cylindrical shape overall, and its outer surface is formed with projections and recesses for fitting onto the inner surface of front barrel 13.

[0027] In the side view shown in FIG. 5(A), the extending portion 33 of the first portion 31 has an angle (approximately 60° to 70° in this embodiment) between the boundary side between the extending portion 33 and the insertion portion 34 and the upper side, which is smaller than the angle (approximately 80° to 90° in this embodiment) between the boundary side and the lower side. In this embodiment, the tip portion of the lower side of the extending portion 33 (the portion farthest from the insertion portion 34) is located near the imaginary line 39, and in some cases, exceeds the imaginary line 39. In this way, the extending portion 33 is asymmetric with respect to the imaginary line 39 in the side view shown in FIG. 5(A). The asymmetry of the extending portion 33 with respect to the imaginary line 39 is the same when viewed from the opposite side of the first direction (see FIG. 5(C)).

[0028] In the plan view shown in FIG. 5(B), the angle between the boundary side between the extension part 33 and the insertion part 34 and the back side side is smaller than the angle between the boundary side and the front side side of the extension part 33. Typically, the tip part of the front side side of the extension part 33 (the part farthest from the insertion part 34) crosses the virtual line 39 and reaches the back side of the virtual line 39. Thus, the extension part 33 is asymmetric with respect to the virtual line 39 in the plan view shown in FIG. 5(B). The asymmetry of the extension part 33 with respect to the virtual line 39 is the same when viewed from the opposite side of the second direction (see FIG. 5(D)). In the present embodiment, the extension part 33 is asymmetric with respect to the virtual line 39 when viewed from any direction perpendicular to the virtual line 39.

[0029] The second part 32 is formed in a generally cylindrical shape, and in this embodiment, is formed in a generally cylindrical shape. The generally cylindrical interior of the second part 32 is a space for accommodating the ballpoint pen tip 50. The second part 32 is connected to the tip part (the part farthest from the insertion part 34) of the extension part 33 such that the axis of the second part 32 formed in a generally cylindrical shape is inclined with respect to the imaginary straight line 39 in the side view shown in FIG. 5(A). The angle between the axis of the second part 32 and the imaginary straight line 39 will be described later. In this embodiment, in the side view shown in FIG. 5(A), one end of the second part 32 in the longitudinal direction is aligned with the upper side of the extension part 33, and the other end protrudes downward from the lower side of the extension part 33. In this embodiment, in the plan view shown in FIG. 5(B), the axis of the second part 32 overlaps with the imaginary straight line 39.

[0030] The first part 31 and the second part 32 constituting the joint 30 are conceptually distinguished for convenience of explanation, and are typically molded as one piece. The joint 30 has a first gouged part 37 (corresponding to the "first gouged part") formed by gouging out between the lower first part 31 and the second part 32 (see FIG. 5(A)). By forming the first gouged part 37, the paper surface can be seen from the first gouged part 37 when writing. The extent of the gouging out of the first gouged part 37 (the distance in the direction perpendicular to the imaginary line 39) may be determined in consideration of the joining strength between the first part 31 and the second part 32 and the required visibility range, and may be, for example, about 1 / 2 the maximum width of the extension part 33. In addition, by forming the first hollowed portion 37, when the ballpoint pen tip 50 is attached to the joint 30, the tip of the ballpoint pen tip 50 can be prevented from protruding in a direction intersecting the imaginary straight line 39. In the present embodiment, the joint 30 has a second hollowed portion 38 (corresponding to a "second hollowed portion") hollowed out between the first part 31 and the second part 32 on the front side (see FIG. 5(B)). By forming the second hollowed portion 38, the part of the paper surface hidden by the joint 30 during writing can be made small. The degree of hollowing out of the second hollowed portion 38 may also be determined taking into consideration the joining strength between the first part 31 and the second part 32 and the required visibility range. The contour of the second hollowed portion 38 is formed in an arc shape so that the first part 31 and the second part 32 are smoothly connected.

[0031] The joint 30 has an ink groove 36 formed on the upper side thereof, which allows ink to pass through. The ink groove 36 is formed continuously from the second portion 32, through the extension portion 33, to the insertion portion 34. In this embodiment, the ink groove 36 opens to the upper side of the joint 30, as shown in the plan view of FIG. 5(B). In addition, the ink groove 36 extends in a curved and straight line manner so as to pass through approximately the center of the width of the joint 30, which is asymmetrical with respect to the imaginary straight line 39, in the plan view shown in FIG. 5(B). The joint 30 has a receiving base 35 at the end of the ink groove 36 on the insertion portion 34 side. The receiving base 35 has a configuration in which the bottom surface of the ink groove 36 is extended, while both side walls are removed. A relay core 41 (see FIG. 4) is arranged in the ink groove 36 and on the receiving base 35. The relay core 41 is typically formed of a porous body that matches the shape of the ink groove 36, and holds the ink by absorbing the ink. The intermediate fiberboard 41 may be made of the same material as the padding 21 or may be made of a different material.

[0032] The structure of the writing instrument 1 will be described again mainly with reference to Figs. 1 to 4. The ballpoint pen tip 50 is a component that supplies ink to a writing object such as a paper surface. The ballpoint pen tip 50 has a pipe 51, a ball 52, and a core 53, as can be easily understood by referring to Figs. 2(B) and 4. The pipe 51 supports the ball 52 and houses the core 53. The pipe 51 is typically formed in a cylindrical shape from a metal such as stainless steel or brass, and in this embodiment, a tapered tip is formed at the tip where the ball 52 is disposed. The tip of the pipe 51 is not limited to being tapered, and may be formed straight. The cylindrical axis of the pipe 51 is the tip axis 59. The ball 52 is typically formed in a spherical shape from a metal such as stainless steel or tungsten, ceramics, or plastic. The ball 52 is formed to a size that allows it to be held by the pipe 51 with a part (less than half) protruding from the tip of the tapered part of the pipe 51. The ball 52 is held in the pipe 51 by crimping the tip of the pipe 51 in which the ball 52 is housed. The core 53 holds ink and supplies ink to the tip of the ballpoint pen tip 50. The core 53 is typically a porous body formed into a cylindrical shape having approximately the same length as the pipe 51. The core 53 may be made of the same material as the inner cotton 21 and / or the relay core 41, or may be made of a different material. The core 53 is housed inside the pipe 51 such that one end surface of the cylindrical shape is in contact with the ball 52 held at the tip of the pipe 51. The ballpoint pen tip 50 is held in the joint 30 with the pipe 51 housed inside the approximately cylindrical second part 32 of the joint 30.

[0033] The above-mentioned components can be assembled into the writing instrument 1 as follows. First, the ballpoint pen tip 50 is manufactured by inserting the core 53 into the pipe 51 holding the ball 52. The manufactured ballpoint pen tip 50 is attached to the second part 32 of the joint 30. At this time, the ball 52 is positioned on the lower side. The joint 30 to which the ballpoint pen tip 50 is attached is inserted into the internal space of the exposed part 16 of the front barrel 13 after the intermediate core 41 is inserted into the ink groove 36. The fitting part 15 of the front barrel 13 to which the joint 30 is attached is fitted into the interior of the rear barrel 11 in which the recess 12 is formed. It is also possible to attach the front barrel 13 to which the joint 30 is not attached to the rear barrel 11, and then attach the joint 30 to which the ballpoint pen tip 50 is attached to the front barrel 13. After the rear barrel 11, the front barrel 13, and the joint 30 are connected, the inner fiber 21 holding the ink is inserted into the rear barrel 11 from the side opposite to the side to which the joint 30 is connected, and the tail plug 23 is used to cover the inner fiber 21. In this manner, the writing instrument 1 is assembled. At this time, one end of the inner fiber 21 is pressed against the tail plug 23, and the other end of the inner fiber 21 is in contact with one end of the intermediate core 41, the other end of the intermediate core 41 is in contact with one end of the central core 53, and the other end of the central core 53 is in contact with the ball 52. With this configuration, the ink held in the inner fiber 21 is supplied to the ball 52 via the intermediate core 41 and the central core 53.

[0034] The configuration of the joint 30 and its surroundings of the writing instrument 1 will be described with reference to both Fig. 6 and Fig. 7. Fig. 6 is a partial side view of the writing instrument 1 around the joint 30, and shows an enlarged view of the joint 30 and its surroundings of the writing instrument 1 shown in Fig. 2(A). In Fig. 6, the cylinder axis 19, the imaginary straight line 39, and the tip axis 59, which should be inside, are shown on the surface. Fig. 7 is an exploded perspective view of the joint 30 and its surroundings. As shown in Fig. 6, the ballpoint pen tip 50 is attached to the joint 30 in such a manner that the tip axis 59 overlaps with the substantially cylindrical axis of the second part 32. Therefore, considering that the substantially cylindrical axis overlaps with the imaginary straight line 39 in the plan view shown in Fig. 5(B) described above, the tip axis 59 overlaps with the imaginary straight line in the plan view shown in Fig. 3(B). Joint 30 and ballpoint tip 50 are arranged so as to fit inside an imaginary cylinder (imaginary tube) formed by extending the outer wall of rear barrel 11 (corresponding to the outer diameter of rear barrel 11) in the direction in which joint 30 and ballpoint tip 50 are arranged.

[0035] The writing implement 1 is configured such that the angle α between the imaginary straight line 39 and the tip axis 59 is 110° or more and 150° or less on the side viewed from the first direction. The angle α is an obtuse angle between the imaginary straight line 39 on the first part 31 side and the tip axis 59 on the ball 52 side, which is closer to the intersection of the imaginary straight line 39 and the tip axis 59. This configuration can prevent so-called "pushing" when a left-handed person writes characters in a stroke order in which the brush is moved from left to right and from top to bottom. This will be explained in more detail. When writing, the writing angle (the angle between the paper surface and the writing implement) is generally said to be 60° to 80° (for example, JIS S 6039, JIS S 6054, JIS S 6061, etc.). Considering this, when the writing instrument 1 according to the present embodiment is held in the left hand, if the ball 52 is brought into contact with the paper surface with the cylinder axis 19 at 60° to the paper surface, the angle between the tip axis 59 and the paper surface to the right of the ball 52 (brush feed direction) is 50° to 90°. Also, if the ball 52 is brought into contact with the paper surface with the cylinder axis 19 at 80° to the paper surface, the angle between the tip axis 59 and the paper surface to the right of the ball 52 is 30° to 70°. Since pushing writing occurs when the angle between the tip axis 59 and the paper surface to the right of the ball 52 (brush feed direction) exceeds 90°, according to the writing instrument 1 according to the present embodiment, pushing writing can be avoided by holding the writing instrument 1 according to the present embodiment in the left hand so that the cylinder axis 19 is at 60° to 80° to the paper surface. On the other hand, in order to smoothly supply ink to the paper surface from the ballpoint pen tip 50, it is preferable to ensure that the angle between the tip axis 59 and the paper surface in the brush feed direction is a predetermined angle or more. Although the general writing angle is as described above, depending on the individual, the angle between the tube axis 19 and the paper surface when the writing instrument 1 is held in the hand may deviate from the writing angle described above. Taking this into consideration, the formed angle α is preferably 140° or less from the viewpoint of reducing the possibility of overwriting, and is preferably 120° or more from the viewpoint of ensuring a smooth supply of ink; in this embodiment, it is set to 130° taking both into consideration.

[0036] As shown in FIG. 8, the writing instrument 1 typically includes a cap 60. The cap 60 includes a main body 61 and a clip 65. The main body 61 is typically formed in a cylindrical shape, with one end face of the cylindrical shape closed and the other end face open. The main body 61 is formed to a length capable of covering the exposed portion 16 of the front barrel 13, the joint 30, and the ballpoint pen tip 50. The inner diameter of the main body 61 is substantially the same as the outer diameter of the part of the exposed portion 16 closest to the flange portion 14. The main body 61 has a plurality of projections 63 formed on the inner surface near the opening face, which protrude slightly inward, spaced apart in the circumferential direction. When the cap 60 is fitted until it contacts the flange portion 14, the projections 63 formed on the inner surface of the main body 61 engage with the raised portion 17 formed on the exposed portion 16, making it difficult for the cap 60 to come off the front barrel 13. The clip 65 is formed in a flat plate shape having approximately the same length as the main body 61, and one end of the clip 65 is connected to a side surface near the closed end surface of the main body 61. The writing instrument 1 is provided with the cap 60, which prevents the ink from drying out and prevents the ball 52 from unintentionally touching something and transferring the ink. In the present embodiment, the writing instrument 1 is configured so that the exposed portion 16, the joint 30, and the ballpoint pen tip 50 fit into the inner diameter of the main body 61 of the cap 60. This configuration makes it easier to attach the cap 60 to the ballpoint pen tip 50 side than the exposed portion 16, and allows the writing instrument 1 to maintain a smart shape (straight rod shape) even when stored.

[0037] The writing instrument 1 configured as described above typically has a cap 60 attached when stored. When writing, the cap 60 is removed by pulling it away from the rear barrel 11, and the periphery of the flange 14 is pinched between the thumb, index finger, and middle finger of the left hand, while the rear barrel 11 is supported in the first inter-finger space of the left hand or its periphery. At this time, the writing instrument is held in a direction such that the ball 52 of the ballpoint pen tip 50 is at the bottom (the position closest to the paper surface). When the writing instrument 1 is held in this manner and a character is written in a stroke order that moves the brush from left to right overall, the angle α between the imaginary straight line 39 and the tip axis 59 on the side viewed from the first direction is 110° or more and 150° or less, so that pushing writing can be suppressed. In addition, since the first gouged portion 37 is formed, the portion of the paper surface where the writing portion is hidden by the joint 30 can be reduced, and the visibility of the portion of the paper surface where the ballpoint pen tip 50 comes into contact can be improved. For example, when writing the English capital letter "E", when writing the bottom horizontal line, the vertical line is hidden by the writing instrument in a writing instrument in which the axis of the pen tip and the axis of the barrel are in a straight line, and the starting position of the bottom horizontal line is not visible, but with the writing instrument 1 according to this embodiment, it can be seen from the first hollowed-out portion 37. In addition, since the writing instrument 1 according to this embodiment has the second hollowed-out portion 38, the part of the writing part on the paper surface that is hidden by the joint 30 can be further reduced, and the visibility of the part of the paper surface that is in contact with the ballpoint pen tip 50 can be further improved. After writing is finished, the cap 60 can be fitted to the exposed portion 16 for storage.

[0038] In the above description, the barrel 10 contains ink by housing the padding 21 inside, but the ink may be housed in the form of a replaceable ballpoint pen refill, or the barrel 10 may contain ink directly.

[0039] In the above explanation, an example of writing characters with the writing instrument 1 has been described, but it goes without saying that the same advantage is also obtained when writing lines other than characters such as figures. In addition, in the above explanation, an example of a left-handed person writing Japanese characters or English characters has been described, but the same advantage is also obtained when a right-handed person writes characters such as Arabic characters that are written in a stroke order that moves the brush from right to left overall. In this case, it is preferable to form the shape corresponding to the second gouged portion 38 of the joint 30 in line symmetry with respect to the virtual straight line 39 in the plane viewed from the second direction from the above-mentioned left-handed one. [Explanation of symbols]

[0040] 1 writing implements 10 shaft cylinder 11 Rear axle 12. Hollow 13 front axis 14 Flange 15 Fitting 16 Exposed part 17 Ridge 19 Cylinder axis (axis of barrel) 21 Padding 23 Tail plug 30 Joints 31 Part 1 (Part 1) 32 Second Part (Second Part) 33 Extension part 34 Insertion part 35 Receiving stand 36 Ink groove 37 First hollow (first hollow) 38 Second gouging part (Second gouging part) 39 Imaginary Line 41 Relay core 50 Ballpoint Pen Tip 51 Pipe 52 Ball 53 Core 59 Tip axis (axis of ballpoint pen tip) 60 Cap 61 Main unit 63 Protrusion 65 clips α Angle

Claims

1. a barrel formed in a cylindrical shape and containing ink therein; Ballpoint pen tip, A joint that connects the barrel and the ballpoint pen tip, The joint has a first portion connected to one end of the barrel and extending in the same direction as a virtual straight line extending along an axis of the barrel, and a second portion for holding the ballpoint pen tip, the first portion is asymmetric with respect to the imaginary line; When viewed from a side in a first direction perpendicular to the imaginary line, an angle between the imaginary line and an axis of the ballpoint pen tip is 110° or more and 150° or less. Writing implements.

2. In a plan view seen from a second direction perpendicular to the virtual straight line and the first direction, an axis of the ballpoint pen tip overlaps with the virtual straight line.

2. The writing instrument of claim 1.

3. The joint has a first hollow portion hollowed out on the side of the tip of the ballpoint pen tip in a side view seen from the first direction.

2. The writing instrument of claim 1.

4. In a plan view of the joint seen from a second direction perpendicular to the virtual line and the first direction, a second recessed portion is formed in a side surface along the virtual line.

4. The writing instrument according to claim 3.

5. The ballpoint pen tip and the joint are accommodated inside an imaginary cylinder that extends from an outer peripheral wall of the barrel in a direction in which the ballpoint pen tip and the joint are arranged.

5. The writing instrument according to claim 1.

Images