WO2017098808A1

WO2017098808A1 - Writing implement

Info

Publication number: WO2017098808A1
Application number: PCT/JP2016/080695
Authority: WO
Inventors: 雅子柳井; 将史吉川; 欣也松下
Original assignee: コクヨ株式会社
Priority date: 2015-12-07
Filing date: 2016-10-17
Publication date: 2017-06-15
Also published as: KR102510201B1; JP2017105004A; CN108349295B; KR20180090248A; CN108349295A; JP6657886B2

Abstract

In order to attain a writing implement that has a barrel that maintains a stable orientation and attitude without requiring the unnecessary tightening of the grip of the fingers, and thus is easy to write with, this writing implement is provided with: a rear section in which the barrel, which is held by the fingers of the user, extends along the axial direction; a front section that is contiguous with the front of the rear section and extends along the axial direction, in which a single flat surface region, which is a flat surface or a convex curved surface having a substantially flat surface shape that expands parallel or substantially parallel to the axial direction, is formed at a site on the outer peripheral surface thereof at which the fingers of the user make contact, while the other sites are formed as a curved surface region having a greater curvature than the flat surface region; and a tip section that is contiguous with the front of the front section and forms a tapered shape and pushes out a writing tip for writing.

Description

Writing instrument

The present invention relates to a writing instrument in which a writing core embodying a function for writing is accommodated in a barrel.

A ballpoint pen and a mechanical pencil are well known as representative examples of this type of writing instrument. A ballpoint pen is one in which a refill equipped with a writing mechanism section including a ball for transferring ink to paper etc. is attached to a tip end portion of a container filled with ink as a writing core in a shaft cylinder and the writing mechanism section is an axis It projects from the tip of the tube. A mechanical pencil incorporates a mechanism for drawing out a pencil lead, which is a writing lead, in a shaft cylinder.

The shape of the outer peripheral surface of the barrel held by the fingers of the user is often cylindrical, but there are also those having a hexagonal shape in cross-sectional view and those having a triangular shape in cross-sectional view like traditional pencils (See, for example, Non-Patent Document 1 below). In addition, there is also one in which a recessed portion which is recessed toward the axial center of the axial cylinder is formed in a predetermined portion of the cylindrical cylinder having a cylindrical outer shape (see, for example, Patent Document 1 below).

JP 2005-138420 A

The present invention is intended to provide a writing instrument in which the direction and posture of the barrel are stable and writing is easy even if the user does not put force on the fingers manually.

In the present invention, the barrel held by the fingers of the user is continuous with the rear extending along the axial direction and the front of the rear and extends along the axial direction, and the user's fingers on the outer peripheral surface A flat surface or a convex surface with a substantially flat surface, which is the only flat surface area extending parallel or substantially parallel to the axial direction, is formed at the portion in contact with the other. A writing instrument comprising: a front portion having a large curved surface area; and a tip portion having a tapered shape continuous with the front of the front portion and having a writing tip for projecting.

It is preferable that the flat surface area in the outer peripheral surface of the front portion and the outer peripheral surface of the tip end portion be continuous in a convex curved shape.

The curved surface area of the outer peripheral surface of the front portion may be substantially flush with the outer peripheral surface of the rear portion except for a portion connected to the flat surface region. In this case, it is possible to create an appearance that is continuous from the rear to the front in the barrel, and to enhance the appearance and appearance as a writing instrument.

Alternatively, assuming that the curved surface area of the outer peripheral surface of the front portion bulges outward more than the outer peripheral surface of the rear portion, the outer diameter of the front portion regardless of the size of the outer diameter of the rear portion of the barrel It becomes easy to design in the optimal size which adapts to the user's finger. In other words, the front can be made thicker than the rear.

If the contour of the flat surface area in the outer peripheral surface of the front in the side view and the contour of the outer peripheral surface of the rear form the same straight line or substantially the same straight line, the flat surface area of the front is the outer peripheral surface of the rear On the other hand, the outer peripheral surface of the rear does not project more than the flat surface area of the front, so that the user can easily hold the cylinder by using the rear part of the cylinder. Less pressure on the base of the index finger of the person.

According to the present invention, it is possible to realize a writing instrument in which the direction and posture of the barrel can be stabilized and writing can be easily performed without the user putting a force on the fingers.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the writing instrument of 1st embodiment of this invention. The top view of the writing instrument of the embodiment. The side view of the writing instrument of the embodiment. The front view of the writing instrument of the embodiment. The AA line sectional view of the writing instrument of the embodiment. The BB sectional view taken on the line of the writing instrument of the embodiment. The perspective view of the writing instrument of 2nd embodiment of this invention. The top view of the writing instrument of the embodiment. The side view of the writing instrument of the embodiment. The front view of the writing instrument of the embodiment. The CC sectional view taken on the line of the writing instrument of the embodiment. The DD sectional view taken on the line of the writing instrument of the embodiment. The figure which shows the use condition of the writing instrument concerning this invention.

First Embodiment An embodiment of the present invention will be described with reference to the drawings. The writing instrument of the present embodiment shown in FIGS. 1 to 6 is a rear end knock type ballpoint pen. This writing instrument has a writing core for embodying the function for writing, the barrel 1 held by the user's finger when writing by the user, and a knock bar disposed on the rear end side of the barrel 1 3 is equipped with a knock mechanism for causing the tip end of the writing tip 2, that is, the tip end portion of the writing core to protrude and retract from the front end (tip end) side of the barrel 1 by knock operation. The barrel 1 accommodates the writing core and the knock mechanism therein.

The writing core is a refill in which the writing mechanism unit 2 having a ball for transferring the ink to paper or the like is attached to the tip end portion of the container filled with the ink. The knock mechanism causes the writing mechanism 2 as the brush tip to protrude from the barrel 1 in response to the depression of the knocking rod 3 and causes the writing mechanism 2 projecting from the barrel 1 to receive the depression of the knocking rod 3 again. It is a khan type knock mechanism which has been well known in the prior art to be inserted into the barrel 1.

The barrel 1 has a hollow cylindrical rear shaft 11 and a front shaft 12 which are extended along the axial center L direction so that the writing core can be inserted therein. One of the front end of the rear shaft 11 and the rear end of the front shaft 12 is provided with a male screw, and the other is provided with a female screw hole, and the male screw is screwed into the female screw hole. The shaft 12 is coupled to form an integral cylinder 1. The front shaft 12 is obtained by covering an outer periphery of a cylindrical base body 121 with an exterior body 122 in direct contact with the user's finger. In addition, it is also possible to shape | mold the base | substrate 121 and the exterior body 122 at once by two-color molding.

The cylinder 1 of the writing instrument in the present embodiment includes a rear portion 13 extending along the axial center L direction, a front portion 14 connected to the front of the rear portion 13 and extending along the axial center L direction, and a front portion of the front portion 14 It has a tapered tapered tip portion 15 whose diameter becomes smaller as it goes forward. Most of the rear portion 13 is formed by the rear shaft 11, while the front end portion of the rear portion 13, the front portion 14 and the tip portion 15 are formed by the front shaft 12. The writing mechanism 2 of the writing core protrudes from the tip 15 thereof.

The outer peripheral surface of the rear portion 13 is generally cylindrical. On the other hand, a single flat surface area 141 and a curved surface area 142 other than the flat surface area 141 exist on the outer peripheral surface of the front portion 14. The flat surface area 141 is a portion on the outer peripheral surface of the front portion 14 in contact with the user's fingers, and has a substantially flat surface shape extended parallel or substantially parallel to the axial center L direction. In particular, as shown in the cross-sectional view taken along the line A-A in FIG. 5, in the present embodiment, the flat surface area 141 is not a completely flat surface, and is separated from the axial center L of the barrel 1 (or writing instrument). In the direction of (3). A convex curved surface is a curved surface in which a line segment connecting any two points on the curved surface along the curved surface in the shortest path is outside the straight line connecting these two points or is equal to such a straight line Say. In short, the convex curved surface is a curved surface in which there is no recess recessed toward the axial center L of the barrel 1. However, the flat surface area 141 may be formed into a completely flat surface.

The flat surface area 141 of the outer peripheral surface of the front portion 14 is continuous with the outer peripheral surface of the truncated conical tip 15 so as to form a convex curved surface, and the flat surface area 141 and the outer peripheral surface of the front end 15 There is no recess recessed toward the axial center L of the barrel 1 at the boundary portion. In addition, the contour 141 a of the flat surface area 141 in the side view shown in FIG. 3 (the state seen from the side orthogonal to the direction of the planar view in which the flat surface area 141 looks the largest as shown in FIG. And the contour 15a of the outer peripheral surface of the tip portion 15 are continuous so as to form a convex curve. A convex curve refers to a curve in which a portion of the curve connecting any two points on the curve is outside or equal to a straight line connecting the two points.

In addition, in the side view shown in FIG. 3, the contour 141 a of the flat surface area 141 of the outer peripheral surface of the front portion 14 forms a straight line or a substantially straight convex curve parallel or substantially parallel to the axis L direction. There is. That is, a line segment connecting any two points on the outline 141a in the shortest route along the outline 141a is outside or equal to a straight line connecting the two points. That is, the flat surface area 141 does not include a recess recessed toward the axial center L of the barrel 1 inside. Furthermore, the contour 141a of the flat surface area 141 of the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form a substantially straight line, and the difference between the former and the latter is small. In the illustrated example, the contour 141 a of the flat surface area 141 of the outer circumferential surface of the front portion 14 is positioned slightly inward (closer to the axial center L of the cylinder 1) than the contour 13 a of the outer circumferential surface of the rear portion 13 However, this is to make the oval peripheral edge of the flat surface area 141 a beautiful shape in a plan view shown in FIG. However, the outer peripheral surfaces of the flat surface area 141 and the rear portion 13 are made so that the contour 141a of the flat surface area 141 of the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form a straight line completely in side view. It may be molded.

The curved surface area 142 of the outer peripheral surface of the front portion 14 is a curved surface having a curvature larger than that of the flat surface area 141. Furthermore, as shown in the cross-sectional view taken along the line B-B in FIG. 6, the curved surface area 142 is substantially flush with the outer peripheral surface of the rear portion 13 except for the portion 142 a connected to the flat surface area 141. . That is, the curved surface area 142 is a partial cylindrical surface which is continuous with the outer peripheral surface of the rear portion 13 except for the connecting portion 142 a and whose outer diameter is equal to the outer diameter of the outer peripheral surface of the rear portion 13. In turn, the portion 142 a of the curved surface area 142 connected to the planar view area bulges outward more than the outer peripheral surface of the rear portion 13. This is a shape for enlarging the width dimension of the flat surface area 141 while aligning the thickness of the front portion 14 of the barrel 1 with the thickness of the rear portion 13. Further, as shown in FIG. 5, the line of intersection between the cut surface orthogonal to the axial center L of the barrel 1 and the curved region 142 (a contour corresponding to the outer peripheral surface of the curved region 142 in a cross sectional view) is Except for the connecting portion 142a described above, it has a true arc shape.

In the present embodiment, the barrel 1 held by the finger of the user is continuous with the rear portion 13 extending along the axial center L direction and the front of the rear portion 13 and extends along the axial center L direction. A single flat surface area 141 which is a flat surface or a convex surface having a substantially flat surface and extends parallel or substantially parallel to the direction of the axial center L is formed at the portion where the user's fingers in the surface meet. Is a curved surface area 142 having a curvature larger than that of the flat surface area 141, and a tip portion 15 which is continuous with the front of the front portion 14 and forms a tapered shape and causes the writing tip 2 to protrude The writing instrument was equipped with.

According to the present embodiment, as shown in (a) to (c) of FIG. 13, any of the thumb, forefinger or middle finger of the user holding the writing instrument has the flat surface area 141 of the front portion 14 of the barrel 1. , And the remaining two fingers are in contact with the curved area 142. As a result, even if the user does not put force on the finger, the relative orientation and posture of the barrel 1 to the user's finger are stabilized, and it becomes possible to write by holding this with light force. However, it is difficult to give the user's fingers a sharp feel like a part of ridge line (edge) where a plurality of flat surfaces meet bites like a traditional pencil forming a hexagonal shape in cross section view, and comfortable writing is realized. it can.

Being able to hold the barrel 1 stably with a light force leads to reducing the writing pressure at the time of writing, which can contribute to the reduction of fatigue of the user's fingers and arms. Moreover, when the ink filled in the refill of the writing instrument is of a relatively low viscosity (for example, aqueous gel ink or low viscosity oil-based ink), writing along with the inherent writing comfort of such an ink makes writing extremely smooth. It will be possible to do. Conversely, in a writing instrument filled with low-viscosity ink, if the user holds the hand with fingers and holds the barrel 1 by hand to increase the writing pressure, the writing smoothness may be impaired. However, by adopting the barrel 1 of the present embodiment, it is possible to suppress unnecessary increase in writing pressure and to maintain the smoothness of writing.

The flat surface area 141 on the outer peripheral surface of the front portion 14 and the outer peripheral surface of the tip portion 15 are continuous in a convex curved shape, and a recess is present at the boundary portion between the flat surface region 141 and the outer peripheral surface of the tip portion 15 Therefore, for a user having a portion close to the tip end portion 15 of the barrel 1, the position at which the barrel 1 is gripped with fingers can be flexibly changed without a sense of discomfort. Therefore, it becomes a highly convenient writing instrument which can respond to an individual difference.

The curved surface area 142 in the outer peripheral surface of the front portion 14 is substantially flush with the outer peripheral surface of the rear portion 13 except for the portion 142 a connected to the flat surface region 141, Up to 14 can create a consistent and continuous appearance, and can enhance the dignity and aesthetics of a writing instrument.

Furthermore, since the contour 141a of the flat surface area 141 on the outer peripheral surface of the front portion 14 in the side view and the contour 13a of the outer peripheral surface of the rear portion 13 are colinear or substantially colinear, the front 14 is flat. The surface area 141 is not largely recessed with respect to the outer peripheral surface of the rear portion 13. Conversely, the outer peripheral surface of the rear portion 13 does not project larger than the flat surface area 141 of the front portion 14. In addition to being easy to hold naturally, the pressure on the base portion of the user's index finger by the rear portion 13 of the barrel 1 is reduced.

Second Embodiment In the second embodiment described below, the outer shape of the front portion 14 of the barrel 1 is modified from the first embodiment. Hereinafter, the configuration unique to this embodiment will be described. The writing core, the knocking mechanism, and the like can be configured in the same manner as the first embodiment (further, the existing writing instrument), and thus the description will be omitted here.

The writing instrument of the present embodiment is a knock type ballpoint pen similar to the first embodiment. The barrel 1 of the writing instrument also has a rear portion 13 extending along the axial center L direction, a front portion 14 extending forward of the rear portion 13 extending along the axial center L direction, and a front portion extending forward of the front portion 14 And a tapered tapered tip portion 15 whose diameter decreases in the direction of. Most of the rear portion 13 is formed by the rear shaft 11, while the front end portion of the rear portion 13, the front portion 14 and the tip portion 15 are formed by the front shaft 12. The writing mechanism 2 which is a writing tip of the writing core protrudes from the tip 15 thereof.

The outer peripheral surface of the rear portion 13 is generally cylindrical. On the other hand, a single flat surface area 141 and a curved surface area 142 other than the flat surface area 141 exist on the outer peripheral surface of the front portion 14. The flat surface area 141 is a portion on the outer peripheral surface of the front portion 14 in contact with the user's fingers, and has a substantially flat surface shape extended parallel or substantially parallel to the axial center L direction. In particular, as shown in a cross-sectional view taken along the line C-C in FIG. 11, the flat surface area 141 is not a perfect flat surface, but is a convex curved surface which bulges slightly outward. However, the flat surface area 141 may be formed into a completely flat surface.

The flat surface area 141 of the outer peripheral surface of the front portion 14 is continuous with the outer peripheral surface of the truncated conical tip 15 so as to form a convex curved surface, and the flat surface area 141 and the outer peripheral surface of the front end 15 There is no recess recessed toward the axial center L of the barrel 1 at the boundary portion. In addition, in the side view shown in FIG. 9, the contour 141a of the flat surface area 141 and the contour 15a of the outer peripheral surface of the distal end portion 15 are continuous so as to form a convex curve.

In addition, in the side view shown in FIG. 9, the contour 141a of the flat surface area 141 of the outer peripheral surface of the front portion 14 forms a straight line or a substantially straight convex curve parallel or substantially parallel to the axis L direction. There is. That is, a line segment connecting any two points on the outline 141a in the shortest route along the outline 141a is outside or equal to a straight line connecting the two points. That is, the flat surface area 141 does not include a recess recessed toward the axial center L of the barrel 1 inside. Furthermore, the contour 141a of the flat surface area 141 of the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form a substantially straight line, and the difference between the former and the latter is small. In the illustrated example, the contour 141a of the flat surface area 141 of the outer circumferential surface of the front portion 14 is positioned slightly inward of the contour 13a of the outer circumferential surface of the rear portion 13, but this is the plan view shown in FIG. In order to make the oval peripheral edge of the flat surface area 141 a beautiful shape. However, the outer peripheral surfaces of the flat surface area 141 and the rear portion 13 are made so that the contour 141a of the flat surface area 141 of the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form a straight line completely in side view. It may be molded.

The curved surface area 142 of the outer peripheral surface of the front portion 14 is a curved surface having a curvature larger than that of the flat surface area 141. Furthermore, as shown in the cross-sectional view taken along the line DD in FIG. 12, the curved region 142 bulges outward more than the outer peripheral surface of the rear portion 13, and except for the front end portion connected to the tip portion 15, The outer diameter of the region 142 is larger than the outer diameter of the outer peripheral surface of the rear portion 13. More specifically, the diameter of the curved surface region 142 gradually increases in the forward direction from the rear end connected to the outer peripheral surface of the rear portion 13 and reaches a maximum diameter halfway through. Thereafter, the diameter of the curved surface area 142 becomes smaller as it gets closer to the front end 15, and the diameter at the front end of the curved surface area 142 becomes equal to the diameter of the rear end of the front end 15. Further, as shown in FIG. 11, the intersection line between the cut surface orthogonal to the axis L of the barrel 1 (or the writing instrument) and the curved region 142 (corresponding to the outer peripheral surface of the curved region 142 in cross section) Contour) has a true arc shape.

Being able to hold the barrel 1 stably with a light force leads to reducing the writing pressure at the time of writing, which can contribute to the reduction of fatigue of the user's fingers and arms. In addition, when the ink filled in the refill of the writing instrument has a relatively low viscosity, it becomes possible to perform writing extremely smoothly, in combination with the original writing comfort of such an ink. Conversely, in a writing instrument filled with low-viscosity ink, if the user holds the hand with fingers and holds the barrel 1 by hand to increase the writing pressure, the writing smoothness may be impaired. However, by adopting the barrel 1 of the present embodiment, it is possible to suppress unnecessary increase in writing pressure and to maintain the smoothness of writing.

Since the curved surface area 142 in the outer peripheral surface of the front portion 14 bulges outward more than the outer peripheral surface of the rear portion 13, regardless of the size of the outer diameter of the rear portion 13 of the barrel 1, Not only it becomes easy to design the outer diameter to an optimal size that fits the user's hand, but it also becomes possible to make the exterior design of the writing instrument innovative.

The present invention is not limited to the embodiments detailed above. For example, the aspect of the writing instrument is not limited to a ballpoint pen. In other words, the writing core is not necessarily the refill of the ballpoint pen. Even when the writing instrument is a pen other than a ballpoint pen (e.g., a pen or the like), the writing core is provided with a mechanism for transferring the ink to paper or the like at the tip of the container filled with the ink. The mechanism is the brush tip. Alternatively, when the writing instrument is a mechanical pencil, the writing core is a pencil core, and a mechanism for drawing out the writing core and causing it to protrude from the tip of the barrel is accommodated in the barrel together with the writing core.

In addition, in the flat surface area and / or the curved surface area on the outer surface of the front of the barrel, the unevenness having a width or diameter of 1 mm or less, which is significantly finer than the thickness of the user's finger and the size of the finger node It does not prevent the provision of grooves, holes, etc.

The specific configurations of the other components can be variously modified without departing from the spirit of the present invention.

The present invention can be applied to a writing instrument in which a writing core embodying a function for writing is accommodated in a barrel.

DESCRIPTION OF SYMBOLS 1 ... Axial cylinder 13 ... Rear 13 ... Contour of the rear in a side view 14 ... Front 141: A flat surface area 141a ... Contour of a flat surface area 142 in a side view 142 ... Curved area 142a ... Part connected to a flat surface area 15 ... Tip Part 2 ... brush tip L ... axis

Claims

The barrel held by the user's fingers is
A rear extending along the axial direction,
A portion extending forward along the axial direction of the rear and extending along the axial direction and having a convex surface with a flat surface or a substantially flat surface parallel to or substantially parallel to the axial direction at a portion of the outer peripheral surface where the user's fingers contact And a front portion in which only one flat surface area is formed and the other portion is a curved surface area having a curvature larger than that of the flat surface area.
A writing instrument comprising: a front end that is continuous with the front of the front portion and has a tapered shape, and a tip portion from which a writing tip is made to protrude.
The writing instrument according to claim 1, wherein the flat surface area of the outer peripheral surface of the front portion and the outer peripheral surface of the tip end portion are continuous in a convex curved shape.
The writing instrument according to claim 1 or 2, wherein the curved surface area in the outer peripheral surface of the front portion is substantially flush with the outer peripheral surface of the rear portion except for a portion connected to the flat surface region.
The writing instrument according to claim 1 or 2, wherein the curved surface area of the outer peripheral surface of the front portion bulges outward more than the outer peripheral surface of the rear portion.
The writing instrument according to claim 1, 2, 3 or 4, wherein the contour of the flat surface area in the outer peripheral surface of the front portion in side view and the contour of the outer peripheral surface of the rear portion are colinear or substantially colinear.