[0001]The present invention relates to a writing instrument comprising housing the writing lead embodying the function for writing the barrel.
Background technique
[0002]Representative examples of this type of writing instrument, it is well known ballpoint pen or mechanical pencil. Ballpoint pen, which was housed in the barrel to refill the ink in the distal end portion of the container filled with ink fitted with writing mechanism for inclusion balls for transferring the paper such as the writing lead, the writing mechanism is axial projecting from the tip of the tube. The pencil has a built-in mechanism for feeding a pencil lead is writing lead in the barrel.
[0003]
　The shape of the outer peripheral surface of the barrel that is held by the fingers of the user, there is often a cylindrical, and which forms a traditional cross section hexagonal shape like a pencil, others forming the cross section triangular (for example, see non-Patent Document 1). Further, in a predetermined portion of the barrel with a cylindrical outer shape, some are formed a recess recessed toward the axial center of the shaft tube (e.g., see Patent Document 1).
CITATION
Patent Document
[0004]
Patent Document 1: JP 2005-138420 JP
Non-Patent Document
[0005]
Non-Patent Document 1: "ballpoint pen / pencil / pencil sharp", Kokuyo General Catalog 2015 edition stationery, ed., Kokuyo Co., Ltd., 2014 12 May, p. 539-545
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　The present invention is one in which the user orientation and attitude of without put a force on the finger barrel is going to provide a writing instrument easy to make a writing stable unnecessarily.
Means for Solving the Problems
[0007]
　In the present invention, the barrel is held by fingers of a user, a rear portion extending along the axial direction, extends along the contiguous axial direction in front of the rear fingers of the user in the outer peripheral surface at a site in contact, is formed only of the flat surface region which extends parallel or substantially parallel to a by axial flat surface or a substantially flat surface shape of the convex curved surface, the curvature than the other sites said flat surface area a front which is the large curved regions of a tapered shape tapering succession in front of the front, to constitute a writing instrument and a distal end portion to project the brush tip for writing.
[0008]
　Wherein the flat surface area of ​​the outer peripheral surface of the front and the tip outer peripheral surface of, it is preferable that the continuous convex curved surface.
[0009]
　Then, the curved area of ​​the outer peripheral surface of the front, except for the portion to be connected to the flat surface area, is also allowed to the rear part of the outer circumferential surface substantially flush. In this case, from the rear of the barrel to the front is able to produce the appearance consistently are continuous, it is possible to enhance magnificent as writing instruments, the appearance.
[0010]
　Alternatively, if one curved region of the outer circumferential surface of the front portion bulges outward from the outer peripheral surface of the rear, regardless of the size of the outer diameter of the rear portion of the barrel, the front portion of the outer diameter it becomes easy to design the optimum size which fit into the fingers of the user. In other words, it is possible to thicker than the rear front.
[0011]
　If the contour of the flat surface area of ​​the outer peripheral surface of the side view the front and the contour of the outer peripheral surface of the rear portion if forms a collinear or substantially collinear, flat surface area of ​​the front portion on the outer peripheral surface of the rear no dent large hand, by the rear outer peripheral surface of the other words are not overhang greater than the front of the flat surface area, on which the user is likely to have barrel naturally by the rear of the barrel, using pressure is reduced to the base portion of the person of the index finger.
Effect of the invention
[0012]
　According to the present invention, the orientation and attitude of the barrel user without put the unnecessarily force the finger can be realized writing implement easily perform stable writing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013]
[1] a perspective view of a writing instrument of a first embodiment of the present invention.
[2] a plan view of the writing instrument of the embodiment.
[Figure 3] a side view of the writing instrument of the embodiment.
[Figure 4] a front view of the writing instrument of the embodiment.
[FIG 5] A-A line cross-sectional view of the writing instrument of the embodiment.
[FIG 6] B-B line cross-sectional view of the writing instrument of the embodiment.
[7] a perspective view of a writing instrument of a second embodiment of the present invention.
[8] a plan view of the writing instrument of the embodiment.
[9] a side view of the writing instrument of the embodiment.
[10] a front view of the writing instrument of the embodiment.
[Figure 11] C-C line cross-sectional view of the writing instrument of the embodiment.
[Figure 12] D-D line cross-sectional view of the writing instrument of the embodiment.
It shows the use state of the writing instrument according to [13] the present invention.
DESCRIPTION OF THE INVENTION
[0014]
　An embodiment of the The present invention will be described with reference to the drawings. Writing instrument of this embodiment shown in FIGS. 1 to 6 are ballpoint pen of the rear end knock-type. This writing instrument comprises a writing lead that embodies the function for writing, knocking rod user and shaft tube 1 is held by the fingers of a user in performing writing, arranged on the rear end side of the shaft tube 1 3 comprises a knock mechanism for projecting and retracting the brush tip 2 that is, the distal end portion of the writing lead from the front end of the barrel 1 (distal) side by being knocking operation. Barrel 1 accommodates them writing lead and the knock mechanism therein.
[0015]
　Writing lead is a tip portion of the container filled with ink, a refill mounted a writing mechanism 2 for inclusion balls for transferring the ink to paper. Knock mechanism, are made to protrude from the writing device 2 is a brush tip receiving depression of the knock rod 3 from the barrel 1, a writing device 2 that protrude from the barrel 1 receives the re-pressing of the knock rod 3 is retracted into the barrel 1, it is a well known Kahn type knock mechanism conventionally.
[0016]
　Barrel 1, each of which with a shaft 11 and a front axle 12 elements after the hollow tubular stretched along the axis L direction to be able to insert the writing lead therein. On one of the rear end portion of the front end portion and the front axle 12 of the rear axle 11 is provided with a male thread, and the other is provided with a female screw hole, before the rear axle 11 by screwing the external thread into the internal thread hole It combines a shaft 12, constituting the barrel 1 integrally. Front axle 12, the outer periphery of the cylindrical base 121, in which covering the exterior body 122 into direct contact with the finger of the user. Incidentally, the substrate 121 and the outer body 122, can be molded into a temporary by two-color molding.
[0017]
　Barrel 1 of the writing instrument in the present embodiment, the rear portion 13 extending along the axis L direction, a front 14 which extends along the contiguous axis L direction in front of the rear 13, in front of the front 14 diameter toward the contiguous front and a tapered distal portion 15 of the tapered reduced. The majority of the rear 13 are shaped by the rear shaft 11, the front end portion of the rear 13, front 14 and the tip 15 is shaped by the front axle 12. Writing mechanism unit 2 of the writing lead is protruded from the tip portion 15.
[0018]
　The outer peripheral surface of the rear 13 is formed in a generally cylindrical shape. In contrast, the outer peripheral surface of the front portion 14, a single flat surface region 141, there are a curved surface region 142 is a region other than the flat surface region 141. Flat surface region 141, the outer circumferential surface of the front 14, in the site where the fingers of the user's contact, a substantially flat surface shape that extends parallel or substantially parallel to the axis L direction. In particular, as shown in a sectional view along line A-A of FIG. 5, in the present embodiment, rather than a complete flat surface flat surface region 141, away from the axis L of the outer (barrel 1 (or writing instrument) It has a convex curved surface slightly bulging towards the direction). The convex curved surface, a line segment connecting any two points on the curved surface in the shortest path along the curved surface, a curved surface, such as equal to such straight or lies outside the straight line connecting them two points Say. In short, the convex surface is that of the curved surface where there is no recess recessed toward the axis L of the barrel 1. However, it is also possible to shape the flat surface region 141, the full flat surface.
[0019]
　Flat surface region 141 of the outer circumferential surface of the front 14 is continuous so as to form a convex curved surface with an outer peripheral surface of the distal end portion 15 forming a frusto-conical, the outer peripheral surface of the flat surface region 141 and a distal end 15 It does not exist recess recessed toward the axis L of the shaft tube 1 at the boundary portion. As mentioned in addition, in a side view (when viewed from the side where the flat surface region 141 as shown in FIG. 2 perpendicular to the direction of the largest visible plan view) as shown in FIG. 3, the contour 141a of the flat surface region 141 and the outline 15a of the outer peripheral surface of the distal end portion 15 and are continuous so as to form a convex curve. The convex curve portion of the curve connecting any two points on the curve refers to a curve as equal to such straight or lies outside the straight line connecting them two points.
[0020]
　In addition, in the side view shown in FIG. 3, the contour 141a of the flat surface region 141 of the outer circumferential surface of the front 14, in parallel with or substantially parallel linear or substantially linear convex curve with respect to the axis L direction there. That is, a line segment connecting any two points on the contour line 141a in the shortest path along the contour line 141a is equal to such a straight line if there outward from the straight line connecting them two points. That is, the flat surface region 141 does not include a recess recessed toward the axis L of the shaft tube 1 therein. Furthermore, the contour 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer circumferential surface of the front 14 has a substantially straight line, the step between the former and the latter has become insignificant. In the illustrated example, the outline 141a of the flat surface region 141 of the outer circumferential surface of the front 14, positioned very slightly inwardly than the outline 13a of the outer peripheral surface of the rear 13 (close to the axis L of the shaft tube 1 side) and it is, this is because the oval shape beautiful shape the periphery of the flat surface region 141 in a plan view shown in FIG. However, as the contour 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer circumferential surface of the front 14 forms a completely straight in a side view, the outer peripheral surface of the flat surface region 141 and the rear 13 unshaped may be.
[0021]
　Curved region 142 of the outer circumferential surface of the front 14 has a larger curved surface of curvature than the flat surface region 141. On top of that, as shown in line B-B sectional view of FIG. 6, the curved surface area 142, except for a portion 142a for connecting to the flat surface region 141, which is the outer peripheral surface of the rear 13 and substantially flush . That is, the curved region 142, except for the connection portions 142a, an outer diameter equal to the outer diameter of the outer peripheral surface of the rear 13 is a partial cylindrical surface continuous with the outer peripheral surface of the rear 13. On reflection, the curved surface area 142, the portion 142a to be connected in plan view area, bulges outward from the outer peripheral surface of the rear 13. This will align the thickness of the barrel 1 of the front 14 to the thickness of the rear 13, a shape for enlarging the width of the flat surface region 141. Further, as shown in FIG. 5, the intersection line between the cutting plane and a curved region 142 which is perpendicular to the axis L of the shaft tube 1 (contour corresponding to the outer peripheral surface of the curved region 142 in a cross-sectional view) is, form a true arc shape except the connection portion 142a.
[0022]
　In this embodiment, the barrel 1 is held by the fingers of the user, a rear 13 extending along the axis L direction, and extends along the forward succession axis L direction of the rear 13, the outer periphery thereof the site where the finger of the user touches the surface, only the flat surface region 141 that extends parallel or substantially parallel to the axial center direction L a flat surface or a substantially flat surface shape of the convex curved surface is formed, other portions There a front 14 which is the large curved region 142 of curvature than the flat surface region 141, forms a tapered tapered succession in front of the front 14, the distal end portion 15 to project the brush tip 2 for writing to constitute a writing instrument is equipped with a.
[0023]
　According to this embodiment, as shown in to free (a) of FIG. 13 (c), the flat surface region of the user's thumb, index finger or any one barrel 1 of the front 14 of the middle finger to hold the writing instrument 141 in surface contact fits in a state in which the remaining two fingers in contact with the curved surface area 142. Result, the user without forcefully in hand, relative orientation and posture can be stabilized against finger of a user of the barrel 1, it is possible to perform writing to hold it in a small force. Yet, as in the traditional pencil forming the cross section hexagonal, hardly given portion of the ridge (edge) of a plurality of flat surfaces intersect is a pointed like feel bite into fingers finger of the user, provide a comfortable writing it can.
[0024]
　To the barrel 1 can be stably held with a light force leads to reducing the writing pressure at the time of writing, it may contribute to the reduction of fatigue of the fingers and the user's arm. Moreover, those ink of relatively low viscosity is filled in the writing instrument of the refill (e.g., an aqueous gel ink or a low-viscosity oil-based ink), then with such ink original writing comfort coupled with a very smooth writing It can be carried out to become. Conversely, the writing instrument is filled with ink of low viscosity, there is a concern if the user unnecessarily writing pressure by sandwiching the barrel 1 forcefully to fingers is increased, the rather smooth writing impaired but by employing the barrel 1 of the present embodiment, unnecessary increase in pen pressure is suppressed, it can be expected that the smoothness of the writing is maintained.
[0025]
　Wherein is continuous in a convex curved surface and the flat surface region 141 of the outer peripheral surface of the front 14 and the outer peripheral surface of the distal end portion 15, there is recessed in the boundary portion between the outer peripheral surface of the flat surface region 141 and a distal end 15 since it does not, to the user with a portion close to the distal end 15 of the barrel 1, and a position for gripping the barrel 1 with a finger without feeling flexibly changeable. Thus, the highly convenient to accommodate individual differences writing instrument.
[0026]
　The curved region 142 in the outer peripheral surface of the front 14, except for the portion 142a to be connected to the flat surface region 141, since it has an outer peripheral surface substantially flush of the rear 13, front from the rear 13 of the barrel 1 until 14 appearance that linearly continuous consistently able to produce, thereby enhancing magnificent as writing instruments, the appearance.
[0027]
　Moreover, since the the contour 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer peripheral surface of the side view the front 14 forms a collinear or substantially collinear, flat front 14 surface area 141 is not recessed large with respect to the outer peripheral surface of the rear 13, by Conversely outer peripheral surface of the rear 13 it does not overhang greater than the flat surface region 141 of the front 14, the user of the barrel cylinder 1 upper likely have naturally, due to the rear 13 of the barrel 1, pressure is reduced with respect to root portion of the user's index finger.
[0028]
　Second embodiment described Next is a modification of the outer shape of the barrel 1 of the front 14 from the first embodiment. Hereinafter, described with respect to the embodiment of the specific configuration. For such writing lead and knock mechanism, the first embodiment (further, existing writing instrument) because it can be configured similarly to, but a description thereof will be omitted.
[0029]
　Writing instrument of this embodiment, similar to the first embodiment, a ballpoint pen knock-type. Barrel 1 of the present writing implement also a rear 13 extending along the axis L direction, a front 14 which extends along the contiguous axis L direction in front of the rear 13, front continuous to the front of the front 14 diameter and a tapered distal portion 15 of the tapered smaller toward the. The majority of the rear 13 are shaped by the rear shaft 11, the front end portion of the rear 13, front 14 and the tip 15 is shaped by the front axle 12. Writing mechanism 2 is a brush tip of the writing lead is protruded from the tip portion 15.
[0030]
　The outer peripheral surface of the rear 13 is formed in a generally cylindrical shape. In contrast, the outer peripheral surface of the front portion 14, a single flat surface region 141, there are a curved surface region 142 is a region other than the flat surface region 141. Flat surface region 141, the outer circumferential surface of the front 14, in the site where the fingers of the user's contact, a substantially flat surface shape that extends parallel or substantially parallel to the axis L direction. In particular, as shown in sectional view taken along line C-C of FIG. 11, the flat surface region 141 is not a complete flat surface, and has a convex curved surface slightly bulging outward. However, it is also possible to shape the flat surface region 141, the full flat surface.
[0031]
　Flat surface region 141 of the outer circumferential surface of the front 14 is continuous so as to form a convex curved surface with an outer peripheral surface of the distal end portion 15 forming a frusto-conical, the outer peripheral surface of the flat surface region 141 and a distal end 15 It does not exist recess recessed toward the axis L of the shaft tube 1 at the boundary portion. As mentioned in addition, in the side view shown in FIG. 9, the contour 15a of the outer peripheral surface contour 141a and the distal end portion 15 of the flat surface region 141 is continuous so as to form a convex curve.
[0032]
　In addition, in the side view shown in FIG. 9, the contour 141a of the flat surface region 141 of the outer circumferential surface of the front 14, in parallel with or substantially parallel linear or substantially linear convex curve with respect to the axis L direction there. That is, a line segment connecting any two points on the contour line 141a in the shortest path along the contour line 141a is equal to such a straight line if there outward from the straight line connecting them two points. That is, the flat surface region 141 does not include a recess recessed toward the axis L of the shaft tube 1 therein. Furthermore, the outline 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer circumferential surface of the front 14 has a substantially straight line, the step between the former and the latter has become insignificant. In the illustrated example, the outline 141a of the flat surface region 141 of the outer circumferential surface of the front 14, but are located very slightly inward than the outline 13a of the outer peripheral surface of the rear 13, which is a plan view shown in FIG. 8 in is to beautiful form an oval-shaped peripheral edge of the flat surface region 141. However, as the contour 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer circumferential surface of the front 14 forms a completely straight in a side view, the outer peripheral surface of the flat surface region 141 and the rear 13 unshaped may be.
[0033]
　Curved region 142 of the outer circumferential surface of the front 14 has a larger curved surface of curvature than the flat surface region 141. On top of that, as shown in line D-D sectional view of FIG. 12, the curved surface area 142 bulges outward from the outer peripheral surface of the rear 13, with the exception of the front end portion continuous with the distal end portion 15, a curved surface the outer diameter of region 142 is larger than the outer diameter of the outer peripheral surface of the rear 13. More specifically, the diameter of the curved area 142 as the rear end toward the front continuing to the outer peripheral surface of the rear 13 gradually becomes thick, the maximum diameter at its middle. Thereafter, the diameter of the more curved region 142 toward the end portion 15 is Yuki thinner, its diameter at the front end of the curved surface area 142 is equal to the diameter of the rear end of the tip section 15. Further, as shown in FIG. 11, the barrel 1 (or writing instrument) corresponds to the outer peripheral surface of the curved region 142 in the intersection line (cross section of the cutting surface and the curved surface area 142 perpendicular to the axis L of contour) forms a true arc shape.
[0034]
　In this embodiment, the barrel 1 is held by the fingers of the user, a rear 13 extending along the axis L direction, and extends along the forward succession axis L direction of the rear 13, the outer periphery thereof the site where the finger of the user touches the surface, only the flat surface region 141 that extends parallel or substantially parallel to the axial center direction L a flat surface or a substantially flat surface shape of the convex curved surface is formed, other portions There a front 14 which is the large curved region 142 of curvature than the flat surface region 141, forms a tapered tapered succession in front of the front 14, the distal end portion 15 to project the brush tip 2 for writing to constitute a writing instrument is equipped with a.
[0035]
　According to this embodiment, as shown in to free (a) of FIG. 13 (c), the flat surface region of the user's thumb, index finger or any one barrel 1 of the front 14 of the middle finger to hold the writing instrument 141 in surface contact fits in a state in which the remaining two fingers in contact with the curved surface area 142. Result, the user without forcefully in hand, relative orientation and posture can be stabilized against finger of a user of the barrel 1, it is possible to perform writing to hold it in a small force. Yet, as in the traditional pencil forming the cross section hexagonal, hardly given portion of the ridge (edge) of a plurality of flat surfaces intersect is a pointed like feel bite into fingers finger of the user, provide a comfortable writing it can.
[0036]
　To the barrel 1 can be stably held with a light force leads to reducing the writing pressure at the time of writing, it may contribute to the reduction of fatigue of the fingers and the user's arm. Moreover, if ink is filled in the writing instrument of the refill is of relatively low viscosity, together with such inks original writing comfort, it is possible to perform very smooth writing. Conversely, the writing instrument is filled with ink of low viscosity, there is a concern if the user unnecessarily writing pressure by sandwiching the barrel 1 forcefully to fingers is increased, the rather smooth writing impaired but by employing the barrel 1 of the present embodiment, unnecessary increase in pen pressure is suppressed, it can be expected that the smoothness of the writing is maintained.
[0037]
　Wherein is continuous in a convex curved surface and the flat surface region 141 of the outer peripheral surface of the front 14 and the outer peripheral surface of the distal end portion 15, there is recessed in the boundary portion between the outer peripheral surface of the flat surface region 141 and a distal end 15 since it does not, to the user with a portion close to the distal end 15 of the barrel 1, and a position for gripping the barrel 1 with a finger without feeling flexibly changeable. Thus, the highly convenient to accommodate individual differences writing instrument.
[0038]
　Since the curved region 142 of the outer peripheral surface of the front 14 is bulged outward from the outer peripheral surface of the rear 13, the outer diameter of the barrel 1 of the rear 13 irrespective to the size, the front 14 not only be designed to an optimum size that fit the outer diameter fingers of a user becomes easy, it is possible to those novel writing instrument of external design.
[0039]
　Moreover, since the the contour 13a of the outer peripheral surface contour 141a and the rear 13 of the flat surface region 141 of the outer peripheral surface of the side view the front 14 forms a collinear or substantially collinear, flat front 14 surface area 141 is not recessed large with respect to the outer peripheral surface of the rear 13, by Conversely outer peripheral surface of the rear 13 it does not overhang greater than the flat surface region 141 of the front 14, the user of the barrel cylinder 1 upper likely have naturally, due to the rear 13 of the barrel 1, pressure is reduced with respect to root portion of the user's index finger.
[0040]
　The present invention is not limited to the embodiment described in detail above. For example, writing instrument embodiment is not limited to ballpoint pens. In other words, the writing lead is not necessarily the refill ballpoint pen. Writing instrument of the type other than the ballpoint pen (e.g., pen, etc.) be a, writing lead is a tip portion of the container filled with ink, it is assumed that a mechanism for transferring the ink to paper or the like is provided, the mechanism is the brush tip. Alternatively, when the writing instrument is a mechanical pencil, writing lead is pencil lead, will accommodate a mechanism for protruding from the distal end of the barrel by feeding the writing lead in the barrel together with the writing lead.
[0041]
　Further, the flat surface region and / or the curved region on the outer surface of the front portion of the barrel, notably fine, width or diameter of less than 1mm irregularities as compared to the size of the section thickness and fingers of the user's finger, groove, it does not interfere with the provision of a hole or the like.
[0042]
　Specific structure of other respective portions can be variously modified without departing from the spirit of the present invention.
Industrial Applicability
[0043]
　The present invention is applicable to writing lead embodying the function for writing the writing instrument comprising housed in a barrel.
DESCRIPTION OF SYMBOLS
[0044]
　1 ... the barrel
　13 ... rear
　rear contour in 13 ... side view
　14 ... front
　141 ... planar surface region
　contour of the flat surface region in 141a ... side view
　142 ... curve area
　portion connected to 142a ... flat surface area
　15 ... tip part
　2 ... brush tip
　L ... axis

claims

[Claim 1]Barrel held by fingers of a user,
a rear portion extending along the axial direction,
extends along the contiguous axial direction in front of the rear, at a site finger of the user's in its outer peripheral surface is in contact the only flat surface region that extends parallel or substantially parallel to a by axial flat surface or a substantially flat surface shape of the convex curved surface is formed, a large curved surface regions of curvature than the other sites said flat surface area and by a front that is,
tapers tapered succession in front of said front, and a tip projecting the brush tip for writing
writing instrument comprises a.
[Claim 2]
The outer peripheral surface and the claims 1 writing instrument according to continuous with the convex curved the leading end portion and the flat surface area of ​​the outer peripheral surface of said front.
[Claim 3]
The curved area of ​​the outer peripheral surface of the front portion, except for the portion connected to the flat surface area, the rear portion of the outer peripheral surface according to claim 1 or 2 writing instruments, wherein the substantially flush.
[Claim 4]
Claim 1 or 2 writing instrument according curved region is bulged outward from the outer peripheral surface of the rear of the outer peripheral surface of said front.
[Claim 5]
It claims 1 to 4 writing implement according the outline of the flat surface area of ​​the outer peripheral surface of the side view the front and the contour of the outer peripheral surface of the rear portion forms a collinear or nearly collinear.