JP2022142872A - writing instrument - Google Patents

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

The present invention relates to writing instruments.

Conventionally, there has been proposed a writing instrument whose writing tip is elastically deformed according to writing pressure.

Patent Document 1 proposes a pen tip structure in which the bending of the pen tip is controlled by the design dimensions of the pen core and its outer cylindrical member.

Patent Document 2 proposes a pen tip structure in which a refill tip (pen tip) is radially deformable and a leaf spring material is arranged on the outer periphery of the pen tip.

Patent Literature 3 proposes a pen tip structure in which a leaf spring material is arranged on the outer periphery of the writing part, and the leaf spring material elastically supports the writing part from radially moving within the barrel.

In Patent Document 4, a writing instrument is provided in which the tip of an ink tube (pen tip) is supported by an elastically deformable base, and the pen tip absorbs writing pressure due to the flexibility of the base during writing, enabling movement similar to that of a fountain pen. Proposed.

JP 2020-11437 A Japanese Utility Model Laid-Open No. 57-162877 Japanese Utility Model Laid-Open No. 60-141277 Japanese Utility Model Laid-Open No. 62-9582

However, the writing instrument disclosed in the above-mentioned publication has a problem in that since the pen point is held by the holding cylinder or the leaf spring, the plate material needs to be processed, which hinders easy manufacturing.

SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to provide a writing utensil that can elastically support the bending of the writing part with a simple material.

The present invention is a writing utensil characterized by having a writing part supported by a barrel with its tip protruding, and an elastically deforming member made of a wire material and in contact with one end of the outer circumference of the writing part.

In the present invention, the elastic deformation member is formed by bending a rod-shaped wire made of metal or the like. It is preferable that it is installed so as to be elastically deformable.

In the present invention, the elastically deformable portion is rotatable in the axial direction about a fulcrum attached to the shaft tube, and a distal end portion of the shaft tube is provided with an elastic member extending in the rotating direction of the elastically deformable member. It is preferable that an opening is formed to expose the writing part.

According to the writing instrument of the present invention, since the elastically deformable member made of a wire is provided in contact with one end of the outer periphery of the writing portion, when the user holds the barrel and writes by applying writing pressure to the writing portion, the elastic deformation is caused. The member is elastically deformed.

Therefore, the user can feel the repulsive force corresponding to the writing pressure on the handle, so that the user can obtain a soft writing feeling like that of a fountain pen.

Moreover, since the elastically deformable portion is made of a simple wire material, it is easier to manufacture and to reduce the weight as compared with a plate material. In addition, since the elastically deformable member is made of a wire material, the obstructing area is small and does not interfere with visual recognition of the barrel and the writing section, so that the design form of the writing instrument can be easily visually recognized.

FIG. 2 is a perspective view showing the tip portion of the writing instrument according to the embodiment in a state where writing pressure is not applied. FIG. 2 is an overall explanatory view of the writing instrument in the state of FIG. 1, where (a) is a front view, (b) is a side view, and (c) is a vertical cross-sectional view taken along line CC of (a). 1. It is explanatory drawing of a tip part at the time of making the writing instrument of the state of FIG. 1 contact a writing surface, Comprising: (a) is a side view, (b) is a longitudinal cross-sectional view. FIG. 2 is a perspective view showing the tip portion of the writing instrument according to the embodiment in a state where writing pressure is applied. FIG. 5 is an overall explanatory view of the writing instrument in the state of FIG. 4, where (a) is a front view, (b) is a side view, and (c) is a vertical cross-sectional view taken along line CC of (a). FIG. 5 is an explanatory view of the tip when the writing instrument in the state of FIG. 4 is brought into contact with the writing surface, and (a) is a side view and (b) is a vertical cross-sectional view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a part explanatory diagram of a front barrel of a writing instrument according to an embodiment, in which (a) is a perspective view from the front left side, (b) is a front view, and (c) is a cross section along the CC line of (f). Figure, (d) is a cross-sectional view along the DD line of (f), (e) is a plan view, (f) is a left side view, (g) is a longitudinal section along the GG line of (e) Fig. (h) is a perspective view from the rear right side, and (i) is a view from the rear.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show the writing instrument according to the embodiment in a state where writing pressure is not applied, FIGS. 4 to 6 show a state in which writing pressure is applied, and FIG. 7 shows a part drawing of the front barrel.

As shown in FIGS. 1 to 6, the writing instrument comprises a writing part 12 supported by a barrel 10 with its tip protruding, and an elastically deforming member 14 made of a wire material and in contact with one end of the outer periphery of the writing part 12. have.

The barrel 10 has a cylindrical rear barrel 18 with a tail plug 16 closed at its rear end, and a front barrel 20 fitted onto the front end 18 a of the rear barrel 18 .

[Writing part 12]
The writing unit 12 is a ballpoint pen refill, and a ballpoint pen tip 12a is attached to the tip of a resin tube-shaped ink tube 12b. Ink (not shown) stored in the ink tube 12b is supplied to the ball-point pen tip 12a. Within the ink tube 12b, the back of the ink contains a liquid or solid follower. The ink tube 12b has elasticity that allows it to bend in the radial direction.

The ballpoint pen tip 12a has a ball 12a1 rotatably held in the tip of a tapered tip outer cylinder 12a2.

The ball 12a1 of the ball-point pen tip 12a and the tip outer cylinder 12a2 may preferably be made of resin or metal. It is preferable that the spring 12a3 is composed of a thin metal wire.

[Front barrel 20]
7A and 7B are explanatory diagrams of parts of the front barrel 20. FIG.

As shown in FIG. 7(e), [F]: front, [B]: rear, [R]: right, [L]: left, and as shown in FIG. 7(f), [ O]: Upward, [U]: Downward.

As shown in FIG. 7, the front barrel 20 has a main body portion 20a having an irregular cylindrical shape, front wall portions 20b projecting forward in pairs at the front end of the main body portion 20a, and elastic members on the sides of the main body portion 20a. A bulging support portion 20c that supports the deformable member is integrally formed of resin.

Specifically, as shown in FIG. 7, the front wall portions 20b, 20b are arranged in a plate-like pair on both left and right sides of the front end opening 20a1 of the main body portion 20a so as to protrude forward. Each of the front wall portions 20b, 20b has an arcuate outer peripheral surface, and the inner surfaces 20b1, 20b1 are formed substantially flat and parallel to each other. It has a thin beak shape.

The support portion 20c is formed in a hill-like shape rising upward from the main body portion 20a. A retaining piece 20c2 for receiving the elastic deformation member 14 is formed at the tip of the left side surface. The support hole 20cl on the left side is formed in the central portion in the front-rear direction, and the support hole 20cr on the right side is formed in the forward portion. In other words, the formation position of the support hole 20cr on the right side is located ahead of the formation position of the support hole 20cl on the left side.

In the hole 20d inside the front barrel 20, the rear inner diameter portion 20db is formed to have a larger diameter than the front inner diameter portion 20df, the central inner diameter portion is larger than the front inner diameter portion 20df, and the rear inner diameter portion 20db is larger than the central inner diameter portion. It expands stepwise.

As shown in FIGS. 2 and 3, the small-diameter tip portion 18a of the rear barrel 18 is fitted and fixed in the rear inner diameter portion 20db of the hole 20d, and the writing section 12 mounted inside the rear barrel 18 is fixed. passes through the hole 20d (20db to 20df) and the tip of the writing part 12 passes between the front wall parts 20b, 20b and is exposed to the front.

Specifically, the tip of the ink tube 12b and the ballpoint pen tip 12a protrude forward from between the forward 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 ball-point pen tip 12a that is not fitted into the ink tube 12b is completely aligned with the front wall portion 20b. , 20b.

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

The ink tube 12b of the writing unit 12 is oscillatably inserted through the front inner diameter portion 20df of the hole 20d with a clearance. The rear end of the ink tube 12b of the writing section 12 is mounted and fixed in the hole 16a of the tail plug 16, and the tail plug 16 supports it.

Therefore, the writing section 12 is configured to be able to bend and swing around the tail plug 16 within the barrel 10 .

Incidentally, as shown in FIG. 2, the hole 16a of the tail plug 16 is open to the outside, and outside air is ventilated into the ink tube 12b through the hole 16a, so that the outside air can be introduced according to the amount of ink used. .

[Elastic deformation member 14]
The elastically deformable member 14 is made of a wire formed by bending a wire that is an elongated rod-shaped object such as a metal. The outer diameter of the wire used for the elastic deformation member 14 is 0.5 mm or more and less than 2.5 mm or the outermost diameter of the ball-point pen tip 12a, which is the writing portion, in order to ensure visibility of the writing portion and to prevent plastic deformation of the elastic deformation member 14 itself. A circular cross-section of less than or equal to 2.5 mm is preferred. Moreover, it is preferable to use a stainless steel material for springs that satisfies ISO6931-1 (1994) as the material. The elastically deformable member 14 is elastically deformable with respect to the front barrel 20 because the bent right end portion 14br and left end portion 14bl of the wire rod are attached to the front barrel 20 of the barrel 10 and serve as a fulcrum.

Specifically, as shown in FIGS. 1 to 3, the elastically deformable member 14 is formed by bending a wire material such as metal into a substantially triangular shape with a front portion 14a having an acute angle, and a rear portion facing inward in the width direction. Both end portions 14br and 14bl are bent so that the front and back positions are different on the right and left sides. The right end 14br is rotatably mounted in the right support hole 20cr of the front barrel 20, and the left end 14bl is rotatably mounted in the left support hole 20cl of the front barrel 20.

That is, the elastically deformable member 14 is rotatable in the direction perpendicular to the axial line about the fulcrum (right support hole 20cr, left support hole 20cl) attached to the front barrel 20 of the barrel 10 . Since the fulcrum is supported by the front barrel 20 with different front and rear positions, the elastic deformation member 14 rotates as shown in FIG. Exert an elastic force to return to the position of

1 to 3, the tip portion 14a of the elastic deformation member 14 is elastically and lightly in contact with the side surface of the ballpoint pen tip 12a of the writing portion 12 when no writing pressure is applied. The member 14 is received by the retaining piece 20c2 so as not to press the writing section 12 any further. At the tip of the front barrel 20 (barrel 10), a front inner diameter portion 20dr, which is an opening that exposes the writing portion 12 toward the rotational direction of the elastic deformation member 14, has clearance with respect to the peripheral surface of the writing portion 12. is formed with

In this way, when writing pressure is not applied, the tip portion 14a is pressed against the side surface of the ballpoint pen tip 12a of the writing portion 12 due to the initial elastic force of the elastic deformation member 14 (at the time of assembly). Since the deformable member 14 is received by the retaining piece 20c2, the writing section 12 is in a state of lightly contacting the lower surface of the inner front inner diameter section 20df of the front barrel 20. As shown in FIG. Therefore, it is possible to prevent the writing section 12 from rattling when not in use.

[Function of Writing Instrument: Description of Elastic Deformation of Writing Unit 12]
As described above, when writing pressure is not applied to the writing unit 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, the same parts as in FIGS. 1 to 3 are denoted by the same reference numerals.

Before writing pressure is applied to the writing portion 12, the ballpoint pen tip 12a is positioned parallel to and between the front wall portions 20b, 20b, as shown in FIGS. As shown in FIG. 3, for example, in a writing preparation state, it is assumed that a user (not shown) holds a writing utensil and brings the ball 12a1 into contact with the writing surface W without applying writing pressure.

On the other hand, when writing pressure is applied, as shown in FIGS. 4 to 6, the writing portion 12 swings upward (in the direction of the arrow O) within the clearance of the front inner diameter portion 20df of the front barrel 20, and the front wall portions 20b, 20b. Attempts to move upwards out of position. As shown in FIG. 6, for example, in a writing state, when a user (not shown) holds a writing implement and applies writing pressure to bring the ball 12a1 into contact with the writing surface W, the writing unit 12 receives a pressing force due to the writing pressure. A state is assumed in which the vicinity of the ball-point pen tip 12a is elastically deformed upward.

At this time, the front portion 14a of the elastic deformation member 14, which is in contact with the side surface of the ballpoint pen tip 12a, is elastically deformed upward because it receives the pressing force of the writing pressure, and exerts a repulsive force due to the elastic deformation on the ballpoint pen tip 12a. At this time, the writing portion 12 bends due to the writing pressure until it comes into contact with the inner upper surface of the front inner diameter portion 20dr.

Therefore, when the user applies writing pressure, the user can write while sensing the repulsive force from the elastic deformation member 14, giving the user a feeling of writing like a fountain pen.

Therefore, according to the writing instrument of the embodiment, since the elastic deformation member 14 formed by bending the wire is simply attached to the front barrel, it is possible to provide a writing instrument that can elastically support the bending of the writing part 12 with a simple material.

Moreover, since the elastically deformable portion 14 is made of a simple wire material, it is easier to manufacture and to reduce the weight of the elastically deformable portion 14 as compared with a plate material. In addition, since the elastic deformation member 14 is made of a wire material, the blocking area is small and does not interfere with the viewing of the barrel 10 and the writing section 12, so that the consumer can easily view the designed form at the store. Therefore, compared with the case where the elastically deformable portion is formed with a plate material, the design is improved, and it is possible to promote sales.

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

In the above-described embodiment, the writing part provided with a ballpoint pen tip was exemplified, but at the tip of the writing part, a pen tip in which synthetic fibers are adhered with a synthetic resin elastomer, or a molding in which an ink guide groove is formed in a synthetic resin It can be applied to a writing part having various pen tips such as a pen tip.

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

10 barrel 12 writing part 12a ballpoint pen tip 12b ink tube 14 elastic deformation member 14a front part 14bl left end part 14br right end part 16 tail plug 16a hole 18 rear barrel 18a tip part 20 front barrel

Claims (3)

a writing unit supported in a state in which the tip protrudes from the barrel;
A writing instrument, comprising: an elastically deformable member made of a wire material, which abuts on one end of the outer circumference of the writing part. The elastic deformation member is formed by bending a wire rod, and both ends of the wire rod serve as fulcrums attached to the shaft cylinder, and the elastic deformation member is installed so as to be elastically deformable. A writing instrument according to claim 1. The elastically deformable portion is rotatable in the axial direction around a fulcrum attached to the barrel,
3. The writing instrument according to claim 1, wherein an opening for exposing the writing portion is formed in the tip portion of the barrel in the rotating direction of the elastic deformation member.

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