Writing instrument

Abstract

To provide a writing instrument capable of elastically supporting the bending of a writing portion with a simple material.SOLUTION: There is provided a writing instrument including a writing portion supported by a barrel with a tip protruding, and an elastically deformable member made of a wire material and in contact with one end of the outer periphery of the writing portion. The elastically deformable member is formed by bending a rod-shaped wire material made of metal or the like. Both ends of the wire material serve as fulcrums attached to the barrel, and the elastically deformable member is installed so as to be elastically deformable.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to writing instruments.

Background Art

[0002] Conventionally, writing instruments have been proposed in which the writing tip elastically deforms according to the writing pressure.

[0003] In Patent Document 1, a pen tip structure has been proposed in which the deflection of the pen tip is controlled by the design dimensions of the pen core and the cylindrical member on its outer periphery.

[0004] In Patent Document 2, a pen tip structure has been proposed in which the refill tip (pen tip) is made deformable in the radial direction and a leaf spring material is arranged on the outer periphery of the pen tip.

[0005] In Patent Document 3, a pen tip structure has been proposed in which a leaf spring material is arranged on the outer periphery of the writing part, and the writing part is elastically supported by the leaf spring material when it moves radially within the shaft cylinder.

[0006] In Patent Document 4, a writing instrument has been proposed in which the tip of an ink tube (pen tip) is supported by an elastically deformable base body, and the pen tip buffers the writing pressure by the flexibility of the base body during writing, enabling fountain pen-like movement.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, since the writing instrument described in the above-mentioned publication holds the pen tip with a holding cylinder or a leaf spring body, processing of the plate material is required, and there is a problem that it becomes a factor inhibiting simple manufacturing.

[0009] In view of such circumstances, the present invention aims to provide a writing instrument that can elastically support the bending of the writing part with a simple material.

Means for Solving the Problems

[0010] The present invention is a writing instrument characterized by having a writing part supported in a state where the tip protrudes from a shaft cylinder, and an elastically deformable member made of a wire material that abuts against one end of the outer periphery of the writing part.

[0011] In the present invention, it is preferable that the elastically deformable member is formed by bending a wire rod such as a metal, and both ends of the wire rod serve as fulcrums attached to the shaft cylinder, and the elastically deformable member is installed so as to be elastically deformable.

[0012] In the present invention, it is preferable that the elastically deformable part is rotatable in the axial direction about a fulcrum attached to the shaft cylinder, and an opening for exposing the writing part in the rotation direction of the elastically deformable member is formed at the tip of the shaft cylinder.

Effects of the Invention

[0013] According to the writing instrument of the present invention, since it has an elastically deformable member made of a wire material that abuts against one end of the outer periphery of the writing part, when the user holds the shaft cylinder and applies a writing pressure to the writing part to write, the elastically deformable member elastically deforms.

[0014] Therefore, since the user senses a repulsive force corresponding to the writing pressure in the handle, a soft writing feeling like that of a fountain pen can be obtained.

[0015] Moreover, since the elastic deformation part is made of a simple wire material, it is easier to manufacture and reduce the weight compared to a plate material. Also, since the elastic deformation member is made of a wire material and the area it blocks is small and does not interfere with visual recognition of the shaft cylinder and the writing part, the design form of the writing instrument can be easily visually recognized.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0018] Regarding the writing instrument according to the embodiment, FIGS. 1 to 3 show a state where no writing pressure is applied, FIGS. 4 to 6 show a state where writing pressure is applied, and FIG. 7 shows a component diagram of the tip shaft.

[0019] As shown in FIGS. 1 to 6, the writing instrument has a writing part 12 supported by the shaft cylinder 10 with its tip protruding, and an elastic deformation member 14 made of a wire material that abuts on one end of the outer periphery of the writing part 12.

[0020] The shaft cylinder 10 has a cylindrical rear shaft 18 with the rear end of the tip shaft plugged by a tail plug 16, and a tip shaft 20 externally fitted to the tip end portion 18a of the rear shaft 18.

[0021] 〔Writing part 12〕 The writing part 12 is a ball pen refill, and a ball pen tip 12a is attached to the tip of a resin tube-shaped ink tube 12b. Ink (not shown) accommodated in the ink tube 12b is supplied into the ball pen tip 12a. In the ink tube 12b, a liquid or solid follower is accommodated at the rear part of the ink. The ink tube 12b has elasticity that can be bent in the radial direction.

[0022] The ball pen tip 12a has a ball 12a1 rotatably held inside the tip portion of a tapered tip outer cylinder 12a2, and a spring 12a3 that biases the ball 12a1 forward is disposed inside the tip outer cylinder 12a2.

[0023] Note that the ball 12a1 of the ball pen tip 12a and the tip outer cylinder 12a2 may be made of either resin or metal. The spring 12a3 is preferably made of a thin metal wire.

[0024] 〔Tip shaft 20〕 FIG. 7 is an explanatory diagram of the components of the tip shaft 20.

[0025] As shown in FIG. 7(e), in the reference signs, [F]: forward, [B]: backward, [R]: right, [L]: left are shown, and as shown in FIG. 7(f), [O]: upward, [U]: downward are shown.

[0026] As shown in Fig. 7, the front shaft 20 is integrally formed of resin and includes a main body portion 20a having an irregular cylindrical shape, a front wall portion 20b protruding forward with respect to the front on the tip of the main body portion 20a, and a bulged support portion 20c for supporting an elastically deformable member on the side portion of the main body portion 20a.

[0027] Specifically, as shown in Fig. 7, the front wall portions 20b, 20b are arranged to protrude forward in a plate shape on both the left and right sides of the front end opening 20a1 of the main body portion 20a. Each front wall portion 20b, 20b has an arcuate outer peripheral surface, and the inner surfaces 20b1, 20b1 are formed to be substantially flat and parallel to each other. The space between the inner surfaces 20b1, 20b1 is open upward and downward, and it is tapered like a beak when viewed from the side.

[0028] The support portion 20c is formed to bulge upward from the main body portion 20a in a hill shape, and support holes 20cr, 20cl into which each end portion of the elastically deformable member 14 is inserted are formed on the right side surface and the left side surface. A retaining piece 20c2 for receiving the elastically deformable member 14 is formed at the front portion of the left side surface. The formation position of the support hole 20cl on the left side surface is formed at the central portion in the front-rear direction, and the support hole 20cr on the right side surface is formed at the front portion. That is, the formation position of the support hole 20cr on the right side surface is located forward of the formation position of the support hole 20cl on the left side surface.

[0029] In the hole 20d inside the front shaft 20, the rear inner diameter portion 20db is formed to have a larger diameter than the front inner diameter portion 20df, and the central inner diameter portion is stepped to have a larger diameter than the rear inner diameter portion 20db with respect to the front inner diameter portion 20df.

[0030] As shown in Figs. 2 and 3, the thin tip portion 18a of the rear shaft 18 is fitted and fixed in the rear inner diameter portion 20db of the hole 20d, and the writing portion 12 mounted in the rear shaft 18 passes through the hole 20d (from 20db to 20df), and the tip portion of the writing portion 12 is exposed forward through between the front wall portions 20b, 20b.

[0031] Specifically, the tip of the ink tube 12b and the ballpoint pen tip 12a protrude forward from between the front wall portions 20b, 20b. As shown in FIG. 3, the tip position of the ink tube 12b substantially coincides with the tip positions of the front wall portions 20b, 20b, and the portion of the ballpoint pen tip 12a that is not fitted into the ink tube 12b completely protrudes forward from the front wall portions 20b, 20b.

[0032] Note that such a positional relationship is an example of the embodiment, and any appropriate positional relationship can be adopted as long as the ballpoint pen tip 12a can swing vertically between the front wall portions 20b, 20b.

[0033] Also, the ink tube 12b of the writing portion 12 is inserted into the front inner diameter portion 20df of the hole 20d with a clearance and is swingably inserted. The rear end of the ink tube 12b of the writing portion 12 is mounted and fixed in the hole 16a of the tail plug 16 and is supported by the tail plug 16.

[0034] Therefore, the writing portion 12 is configured to be able to bend and swing around the tail plug 16 within the shaft cylinder 10.

[0035] As shown in FIG. 2, the hole 16a of the tail plug 16 is open to the outside, and outside air can ventilate into the ink tube 12b through the hole 16a, and outside air can be introduced according to the reduction of the ink.

[0036] 〔Elastic Deformation Member 14〕 The elastic deformation member 14 is made of a wire formed by bending a slender rod-shaped object such as metal. The outer diameter of the wire used for the elastic deformation member 14 preferably has a circular cross-section of 0.5 mm or more and less than 2.5 mm or less than the outermost diameter portion of the ballpoint pen tip 12a which is the writing portion in order to ensure the visibility of the writing portion and prevent the elastic deformation member 14 itself from undergoing plastic deformation. Also, it is preferable to use a spring stainless steel material that satisfies ISO6931-1 (1994). The elastic deformation member 14 is installed so as to be elastically deformable with respect to the front shaft 20 because the bent right end portion 14br and left end portion 14bl of the wire are attached to the front shaft 20 of the shaft cylinder 10 to serve as fulcrums.

[0037] Specifically, as shown in FIGS. 1 to 3, the elastic deformation member 14 is formed by bending a wire such as metal into a substantially triangular shape with the tip portion 14a having an acute angle, and the rear portion is bent with the inner side in the width direction facing inward, and the front and rear positions of the right and left ends are offset, resulting in both end portions 14br and 14bl. The right end portion 14br is rotatably mounted in the right support hole 20cr of the tip shaft 20, and the left end portion 14bl is rotatably mounted in the left support hole 20cl of the tip shaft 20.

[0038] That is, the elastic deformation member 14 is rotatable in a direction perpendicular to the axis with the fulcrums (right support hole 20cr and left support hole 20cl) attached to the tip shaft 20 of the shaft cylinder 10 as the axes. Since the fulcrums are supported by the tip shaft 20 with the front and rear positions offset, when a force is applied from the writing portion 12, the elastic deformation member 14 rotates as shown in FIG. 3, and when the force is removed, it exhibits an elastic force that returns to its original position as shown in FIG. 1.

[0039] Here, when no writing pressure is applied, as shown in FIGS. 1 to 3, the tip portion 14a of the elastic deformation member 14 elastically and lightly contacts the side surface of the ball pen tip 12a of the writing portion 12, and the elastic deformation member 14 is received by the retaining piece 20c2 and 、 does not press the writing portion 12 any further. Also, at the tip end of the tip shaft 20 (shaft cylinder 10), there is a tip inner diameter portion which is an opening for exposing the writing portion 12 in the rotation direction of the elastic deformation member 14 、 and is formed with a clearance with respect to the peripheral surface of the writing portion 12. 20df In this way, when no writing pressure is applied, due to the initial (at the time of assembly) elastic force of the elastic deformation member 14, the tip portion 14a presses against and contacts the side surface of the ball pen tip 12a of the writing portion 12. However, since the elastic deformation member 14 is received by the retaining piece 20c2, the writing portion 12 is in a state of lightly contacting the lower surface of the tip inner diameter portion 20df inside the tip shaft 20. Therefore, rattling of the writing portion 12 in the non-use state can be prevented.

[0040]

[0041] 〔Function of the writing instrument: Explanation when the writing portion 12 is elastically deformed〕 As described above, when no writing pressure is applied to the writing section 12, the state is as shown in FIGS. 1 to 3, but when writing pressure is applied, the state is as shown in FIGS. 4 to 6. In FIGS. 4 to 6, the same reference numerals are given to the same parts as in FIGS. 1 to 3.

[0042] Before writing pressure is applied to the writing section 12, as shown in FIGS. 1 to 3, the ball pen tip 12a is parallel to and located between the distal wall portions 20b, 20b. As shown in FIG. 3, for example, in a writing preparation state, it is assumed that a user (not shown) holds the writing instrument and brings the ball 12a1 into contact with the writing surface W without applying writing pressure.

[0043] On the other hand, when writing pressure is applied, as shown in FIGS. 4 to 6, the writing section 12 swings upward (in the direction of arrow O) within the clearance of the distal inner diameter portion 20df of the distal shaft 20 and tries to move upward from the positions of the distal wall portions 20b, 20b. As shown in FIG. 6, for example, in a writing state, when a user (not shown) holds the writing instrument and applies writing pressure to bring the ball 12a1 into contact with the writing surface W, it is assumed that the writing section 12 receives a pressing force due to the writing pressure and the periphery of the ball pen tip 12a is elastically deformed upward.

[0044] At this time, the distal portion 14a of the elastic deformation member 14 that contacts the side surface of the ball pen tip 12a receives the pressing force due to the writing pressure and elastically deforms upward, applying a repulsive force due to the elastic deformation to the ball pen tip 12a. At this time, due to the writing pressure, the writing section 12 bends until it contacts the inner upper surface of the distal inner diameter portion 20df until it contacts the inner upper surface of the distal inner diameter portion.

[0045] Therefore, when the user applies writing pressure, the user can write while sensing the repulsive force from the elastic deformation member 14, and the user can be given a writing feeling like that of a fountain pen.

[0046] Therefore, according to the writing instrument of the embodiment, since the elastic deformation member 14 formed by bending a wire rod is simply mounted on the distal shaft, a writing instrument that can elastically support the deflection of the writing section 12 with a simple material can be provided.

[0047] Also, elastic deformationmember Since the elastic deformation member 14 is made of a simple wire material, it is easier to manufacture and reduce the weight compared to a plate material. Also, since the elastic deformation member 14 is made of a wire material, the area it blocks is small and it does not interfere with the visual recognition of the shaft cylinder 10 and the writing part 12. Therefore, the consumer can easily visually recognize the design form in the store. member Accordingly, it is possible to improve the design and lead to the promotion of sales as compared with the case where the elastic deformation is formed by a plate material.

[0048] Also, since the rear end of the writing part 12 is fitted into the hole 16a of the tail plug 16, the swing radius of the writing part 12 can be freely set by setting the distance of the fitting part.

[0049] In the above embodiment, the writing part provided with a ball pen tip is exemplified. However, the present invention can be applied to a writing part having various pen tips such as a pen tip in which synthetic fibers are adhered with a synthetic resin elastomer or a molded pen tip in which an ink guiding groove is formed in a synthetic resin at the tip of the writing part.

Industrial Applicability

[0050] The writing instrument of the present invention can be used not only for ball pens but also for writing instruments with other types of pen tips.

Explanation of Reference Numerals

[0051] 10 Shaft cylinder 12 Writing part 12a Ball pen tip 12b Ink tube 14 Elastic deformation member 14a Leading part 14bl Left end part 14br Right end part 16 Tail plug 16a Hole 18 Rear shaft 18a Leading end part 20 Front shaft

Claims

1. A writing part supported in a state where its tip protrudes from a shaft cylinder, and an elastic deformation member made of a wire for a spring that abuts against one end of the outer periphery of the writing part. The elastic deformation member includes a tip portion where the wire is bent at an acute angle, and rear portions of both end portions that are bent with their front and rear positions offset while facing the inner side in the width direction. The writing instrument is characterized in that both end portions serve as fulcrums rotatably attached to the shaft cylinder with their front and rear positions offset, and the elastic deformation member is elastically deformably installed on the shaft cylinder.

2. The elastic deformation member is rotatable in the axial direction about a fulcrum attached to the shaft cylinder. The writing instrument according to claim 1, wherein an opening for exposing the writing part is formed at the tip of the shaft cylinder in the rotation direction of the elastic deformation member.

3. The writing instrument according to claim 2, wherein front wall portions protruding forward in pairs in a plate shape are arranged on both the left and right sides of the opening at the tip of the shaft cylinder, the space between the pair of front wall portions is open, and the tip of the writing part is configured to be swingable between the front wall portions.

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