JP2008068523A - Writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a positional slippage in the axial direction due to deformation accompanying a writing pressure, even when a grip is of low hardness and liable to be deformed in conformity with the shapes of fingers. <P>SOLUTION: An engagement band 3 is wound circumferentially around the outer peripheral surface of the grip 2 and it is engaged annularly and retained by a connecting part 3c. By the engagement band 3, the grip 2 is brought into close contact with the outer peripheral surface 1a of a shaft tube 1 over the whole periphery. Even when a forward pressing power is applied to the grip 2 by the writing pressure, therefore, it is not partially concentrated in the circumference, but is applied almost uniformly in this direction, and thus the forward positional slippage of the grip 2 is prevented by a frictional resistance that arises between the grip and the outer peripheral surface 1a of the shaft tube. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a writing instrument such as a ballpoint pen, a mechanical pencil, or a sign pen provided with a cylindrical grip (elastic gripping member) made of an elastically deformable soft material for the purpose of preventing slipping at a gripping portion of a shaft tube.
More specifically, the present invention relates to a writing instrument in which a grip is belted to prevent positional deviation.

Conventionally, as a writing instrument of this type, a plurality of convex parts (rear thick parts) protrude at equal intervals in the circumferential direction toward the rear end of a grip (cover body) made of a soft material (silicone rubber). By forming and fitting these convex portions into the concave portions (spaces) defined between the outer peripheral surface of the shaft cylinder and its rear fixed projection, and covering and sandwiching from the outside with a locking ring (rear locking ring), The rear end convex part of the grip and the shaft tube are partially concavo-convexly fitted in the circumferential direction, and a narrow rear narrow part is formed between the rear fixing protrusion and the locking ring, and the writing pressure (writing Even if a grip is applied to the rear end of the grip (enclosure) by the gripping pressure at the time, the rear end convex portion of the grip is prevented from passing through the narrow rear portion ( For example, see Patent Document 1).
Further, the shaft cylinder and the grip made of a soft material are fixed, and one or more recesses or through holes (holes) are formed on the rear side of the grip, and protrusions that engage with the recesses or the through holes are formed on the shaft cylinder side. Formed in the circumferential direction, and by holding the protrusions through the through-holes partially in the circumferential direction so that they cannot move forward, loosening of the grip and shaft cylinder, idle rotation, etc. are prevented. There are some (see, for example, Patent Document 2).

However, according to such a conventional writing instrument, in the case of Patent Document 1, when a forward pressing force is applied to the rear end portion of the grip, the entire rear end portion of the grip extends and deforms in the axial direction. Because the forward pressing force is concentrated only on the plurality of concave and convex portions that are partially arranged in the circumferential direction, the thickness of each convex portion made of a soft material (silicone rubber) is reduced. There exists a problem that it is easy, and there exists a possibility that an uneven | corrugated fitting part may remove | deviate and it may shift to the front by it.
In the case of Patent Document 2, when a forward pressing force is applied to the rear end portion of the grip, the entire rear end portion of the grip extends and deforms in the axial direction, and the forward pressing force is changed in the circumferential direction. Because it is intensively applied to the uneven fitting part and shaft fitting part that are partially arranged, the thickness of the concave parts and through-holes made of soft material tends to be thinned, so that the uneven fitting part can be removed or penetrated There is a problem that there is a possibility that the hole is torn and the position is shifted forward.
In particular, in recent years, from the viewpoint of improving the feeling of fitting to the fingers (gripping feel), etc., it is easily deformed according to the shape of the fingers, for example, a surface hardness (C type hardness meter) made of a low hardness material of less than 30 degrees. The grip is increasing, and in this case, the above-described positional deviation becomes remarkable and there is a problem that a comfortable fit cannot be maintained for a long time.
Japanese Patent Laying-Open No. 2005-07585 (Pages 4, 5, 7, 8; FIG. 2-8) Japanese Patent Laying-Open No. 2005-67085 (pages 3, 4 and FIGS. 1, 3-8)

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the position in the axial direction due to the deformation caused by the pen pressure even with a low-hardness grip that easily deforms according to the shape of the finger. The object is to provide a writing instrument that prevents misalignment.

In order to solve the above-mentioned problems, the first invention is characterized in that a locking band is wound in the circumferential direction along the outer peripheral surface of the grip, and is held in an annular shape by a connecting portion.
In the second invention, in addition to the configuration of the first invention, a locking projection is provided on the inner periphery of the locking band, and the locking projection and a recess formed in the shaft tube. Are fitted in the radial direction of the shaft tube.
In the third invention, in addition to the configuration of the first or second invention, an engagement recess is provided in the locking band, and the surface of the grip compressed and deformed by the locking band is bitten. It is characterized by that.
According to a fourth aspect of the invention, in addition to the structure of any one of the first to third aspects, a cover means is provided outside the locking band so as to be brought into non-expandable contact. And

The present invention has the following effects by the above configuration.
According to the first aspect of the present invention, the locking band is wound in the circumferential direction along the outer peripheral surface of the grip, and is held in an annularly locked manner by the connecting portion. Even if a forward pressure is applied to the grip with the pen pressure, the forward pressure is not partially concentrated in the circumferential direction but is applied evenly in the circumferential direction. The grip does not move forward due to the frictional resistance generated between it and the outer peripheral surface.
Therefore, it is possible to provide a writing instrument that prevents a displacement in the axial direction due to deformation caused by writing pressure even with a low-hardness grip that easily deforms in accordance with the shape of a finger.
Therefore, compared with the conventional technology that keeps the grip immovable forward by uneven fitting or axial fitting partially arranged in the circumferential direction, it does not cause partial tearing, but it is a long-term A comfortable fit can be maintained throughout.

According to the second aspect of the present invention, the locking projection is provided on the inner periphery of the locking band, and the locking projection and the recess formed in the shaft tube 1 are fitted in the radial direction of the shaft tube. Thus, the locking band is locked so as not to move in the axial direction and the circumferential direction with respect to the shaft tube.
Therefore, the locking band and the grip can be accurately positioned on the shaft tube.
Therefore, even if it manufactures in large quantities, there is no variation in a product and a commercial value can be improved.

According to the third invention, the engagement band is provided with an engagement recess, and the surface of the grip compressed and deformed by the engagement band is bitten into the circumferential direction or the axial direction of the grip with respect to the engagement band. Is prevented, and the amount of protrusion from the locking band is reduced by the escape portion of the grip compressed and deformed by the locking band.
Accordingly, it is possible to facilitate the assembly of the locking band while further improving the grip displacement prevention function.
Therefore, the assembling work is facilitated, the manufacturing time can be shortened, and the cost can be reduced.

According to the fourth aspect of the present invention, the cover means is provided outside the locking band and brought into contact with the diameter of the locking band so that the locking band cannot be expanded, so that the locking band cannot be removed.
Therefore, the locking band can be prevented from falling off.
Therefore, it becomes strong, and even if an impact such as dropping is given, it is not disassembled and the commercial value can be increased.

  As shown in FIGS. 1 to 3, the writing instrument A of the present invention includes a shaft cylinder 1, an elastically deformable cylindrical grip 2 that is inserted along the outer peripheral surface 1 a, and an outer periphery of the grip 2. A locking band 3, and the locking band 3 is wound along the outer peripheral surface of the grip 2 to compress and deform the grip 2 so as to be immovable in the axial direction and the circumferential direction with respect to the axial tube 1. To do.

  The grip 2 is a substantially cylindrical body formed of an elastically deformable material or at least only a surface portion of the grip 2 or a square cylinder body such as a triangular or polygonal cross section. A protruding portion 2a having a larger diameter than the other portion is formed on the outer peripheral surface of the grip 2 at substantially the center in the axial direction over the entire circumference. An inclined curved surface portion 2b that smoothly continues in the axial direction from the front to the front (downward in the drawing) and the rear (upward in the drawing) is formed.

  More specifically, the approximate center in the axial direction of the grip 2 is a position slightly ahead of the central position in the axial direction of the barrel 1, and the raised portion 2 a is arranged around this, and both the front and rear of the raised portion 2 a are arranged. A pair of inclined curved surface portions 2b are arranged in the shape of a trapezoid so as to have a substantially trapezoidal longitudinal section.

  Further, as the molding material of the grip 2, for example, a low-hardness elastic material such as rubber, silicone rubber, or elastomer is used, or a low-hardness elastic material such as an elastically deformable foam made of a synthetic resin is used. And when the grip 2 is gripped, its hardness becomes flexible and the gripping force of the fingers (gripping force) is appropriately dispersed and absorbed, and the weight of the grip 2 can be reduced for a long time. Even if you use it for a long time, it is hard to get tired.

When a foam that can be elastically deformed is used as the molding material of the grip 2, it is preferable because it is lightweight and has an appropriate frictional resistance. Particularly, for example, an ethylene-vinyl acetate copolymer (EVA) or a crosslinked polyethylene foam. , Foam of closed cell structure such as foam of vinyl chloride, foam of styrene elastomer, surface hardness (C type hardness meter, JIS K 6767) is 15 to 30 degrees, rebound resilience (JIS K 6400) is 15 % Or less and an apparent density (JIS K 6767) of 0.08 to 0.17 g / cm ³ is excellent in durability while having low resilience characteristics in which gripping force is appropriately dispersed.

That is, when the surface hardness is 15 degrees or less, if the gripping force is strong, the grip 2 alone cannot be fully buffered and the shaft body 1 feels the hardness, the gripping stability is inferior and the finger moves and deforms. In addition, when the surface hardness is 30 degrees or more, the stress of the grip 2 when gripped is high, the deformation of the grip 2 according to the shape of the finger is difficult to occur, and it is easy to get tired with writing over a long period of time. It is difficult to use for users with low gripping force such as elderly people.
When the impact resilience exceeds 15%, the foam has a large resilience against compression, and fatigue tends to accumulate when used for a long time.
When the apparent density is lighter than 0.08, the strength of the foam itself also decreases, and it cannot be tolerated due to distortion and wear due to gripping force with use over a long period of time, and the apparent density is 0.17. If it is larger, the weight of the grip 2 becomes larger, which causes fatigue.

  The grip 2 formed of such an elastic material has an inner diameter slightly smaller than the outer diameter of the shaft tube 1 so that the grip 2 is not displaced with respect to the outer surface 1a of the shaft tube 1, and the shaft tube outer surface 1a. In this state, the inner peripheral surface 2c of the grip 2 is brought into close contact with the outer peripheral surface 1a of the shaft cylinder so that a large frictional resistance is generated between them.

  The shaft cylinder outer peripheral surface 1a is provided with an annular protrusion 1b extending in the circumferential direction and a vertical protrusion 1c extending in the axial direction as a protrusion for preventing slippage that engages with the inner peripheral surface 2c of the grip 2. It is preferable that the grip 2 is held immovably in the axial direction and the circumferential direction with respect to the outer peripheral surface 1a of the shaft cylinder by closely attaching the protrusions 1b and 1c for preventing misalignment to the inner peripheral surface 2c of the grip.

  The annular protrusion 1b and the vertical protrusion 1c are inclined so that their outer diameters gradually increase in the insertion direction of the grip 2 with respect to the outer peripheral surface 1a of the shaft cylinder 1 or are formed in an arc shape so that the outer periphery of the shaft cylinder When the grip 2 is inserted along the surface 1a, the annular protrusion 1b and the vertical protrusion 1c can be smoothly overcome.

Further, when a plurality of the annular protrusions 1b and the vertical protrusions 1c are arranged in the axial direction of the shaft cylinder 1, if each of them is continuously arranged in the axial direction, the grip 2 is inserted along the outer peripheral surface 1a of the shaft cylinder. As a result, a large frictional resistance continues when the annular protrusion 1b and the vertical protrusion 1c are overcome, so that the tip 2d in the insertion direction of the grip 2 turns inside and enters, so that there is a gap between the annular protrusion 1b and the vertical protrusion 1c. By forming gaps of appropriate dimensions, the frictional resistance with the grip 2 is released, and the tip end 2d in the insertion direction is prevented from turning inward.
According to the experiment, when the molding material of the grip 2 is the above-mentioned foam having the closed cell structure and elastically deformable, there is a gap of about 5 mm or more in the axial direction between the annular protrusion 1b and the vertical protrusion 1c. In this case, the grip 2 could be smoothly inserted without the tip 2d in the insertion direction being turned inward.

  The locking band 3 is made of, for example, a synthetic resin such as polypropylene, and at least a part of the locking band 3 is formed in an elastically deformable band plate shape. A circumferential direction along an appropriate outer peripheral surface of the grip 2 By winding the locking band 3 and then locking it in an annular shape, the outer peripheral surface at an appropriate location of the grip 2 is compressed and deformed over the entire circumference with an appropriate tightening pressure, and its elasticity is used. Thus, the locking state of the locking band 3 is maintained, and the locking band 3 and the locking band 3 are locked by locking the inner end portion of the locking band 3 with respect to the shaft tube 1 in the axial direction and the circumferential direction. The grip 2 is structured so as to be immovable in the axial direction and the circumferential direction with respect to the barrel 1.

  The locking band 3 will be described in detail. In the illustrated example, as shown in FIG. 1C and FIGS. 3A to 3C, the locking band 3 is curved in an arc shape along the outer peripheral surface of the grip 2. The band plate portion 3a, the elastically deformable thin portion 3b disposed at appropriate intervals in the circumferential direction of the band plate portion 3a, and the fitting portions 3c fitted to each other disposed near both ends in the circumferential direction of the band plate portion 3a Are bent from the thin portion 3b and wound around the belt plate 3a in an annular shape along the outer peripheral surface of the grip 2, and the connecting portion 3c is overlapped in the radial direction of the shaft tube 1 to each other. By engaging, the entire locking band 3 is locked in an annular shape.

  A locking projection 3d is provided on the inner periphery of the band plate portion 3a, and the locking projection 3d and a recess 1d such as a through hole or a groove formed in the shaft tube 1 are connected to the shaft tube 1. By engaging with each other in the radial direction, the locking band 3 is locked to the shaft tube 1 so as not to move in the axial direction and the circumferential direction.

  Further, the band plate portion 3a is provided with a plurality of engaging recesses 3e such as through holes and grooves opened at appropriate intervals in the circumferential direction, and the grip 2 compressed and deformed by the locking band 3 is provided. By utilizing the elastic force of the engagement band 3, the surface of each engagement recess 3 e is bitten to prevent the grip band 2 from being displaced in the circumferential direction or the axial direction, and the engagement band 3. As a result, the amount of protrusion from the locking band 3 is reduced and the assembly is facilitated.

Further, the locking band 3 locked in an annular shape is formed on the inner peripheral surface of the band plate portion 3a by forming a locking step portion 3f that bites into the outer peripheral surface of the grip 2 and engages in the axial direction. The outer peripheral surface of the grip 2 is prevented from being displaced at least forward from the inner peripheral surface.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1 to 3, a locking band 3 is wound around the rear end portion 2 e of the grip 2 made of the above-described closed-cell structure elastically deformable foam and locked in an annular shape. Thus, the grip 2 is compressed and deformed and held in the axial direction and the circumferential direction so as not to move in the axial direction, and the cover band 4 is placed on the outer side of the lock band 3 so that the lock band 3 is expanded in diameter. The front end 5 is screwed to the outer peripheral surface of the front end portion of the shaft cylinder 1 and the elastic ring 6 is disposed between the front end 5 and the grip 2.

In the illustrated example, the cover means 4 is a tail plug, and the inner diameter of the portion facing the locking band 3 with the tail plug 4 covered with the rear end portion of the shaft tube 1 is The diameter of the locking band 3 is prevented from increasing by being substantially the same as the outer diameter of the locking band 3 that is locked in a ring shape by the connecting portion 3c.
Further, as another example, an annular body such as a decorative ring can be substituted.

  Further, this tail plug 4 is screwed and connected to the outer peripheral surface of the rear end of the shaft tube 1 so that it is integrally connected to the shaft tube 1. The cosmetic cap 4a is detachably fitted and closed.

  The elastic ring 6 is made of rubber or an elastic synthetic resin material that is harder than the grip 2, and has a good grip feeling especially for a user who holds the vicinity of the tip 5 located on the distal end side of the shaft tube 1. In addition, the gripping hand is prevented from being displaced forward by the writing pressure.

  Furthermore, in the case of the illustrated example, the refill 7 is incorporated into the shaft cylinder 1 so that the writing tip 7a always protrudes from the tip 3 and the writing tip 7a is detachably covered with a cap 8. This shows the case of a ballpoint pen.

Next, the effect of the writing instrument A will be described.
The locking band 3 is wound around the grip 2 and is annularly locked by the connecting portion 3c, and the grip 2 is compressed and deformed over the entire circumference between the locking band 3 and the outer peripheral surface 1a of the shaft tube 1, Since the locking state of the locking band 3 is maintained using elastic force, the grip 2 compressed and deformed with the locking band 3 is in close contact with the outer peripheral surface 1a of the shaft tube 1 over the entire circumference. The locking projection 3d protruding from the inner periphery of the locking band 3 and the recess 1d formed in the shaft tube 1 are fitted together so that the locking band 3 is axially and circumferentially connected to the shaft tube 1. It is locked so that it cannot move in the direction.
As a result, even if a forward pressing force is applied to the grip 2 with the pen pressure, the forward pressing force is not concentrated partially in the circumferential direction but is applied substantially evenly in the circumferential direction. The grip 2 made of a low-hardness elastic material that easily deforms in accordance with the shape of the finger due to the frictional resistance generated between the engagement band 3 and the engagement projection 3d of the engagement band 3 and the recess 1d of the shaft 1 Even so, it is possible to reliably prevent positional displacement in the forward and circumferential directions due to the writing pressure.

Further, an engagement recess 3e such as a through hole or a groove opened in the locking band 3 is provided, and the surface of the grip 2 compressed and deformed by the locking band 3 bites into the engagement recess 3e. This prevents the displacement of the surface of the grip 2 with respect to the locking band 3 in the circumferential direction or the axial direction, and serves as a relief portion of the grip 2 compressed and deformed by the locking band 3. The amount of protrusion from the band 3 is reduced.
As a result, the function of preventing the displacement of the grip 2 is further improved, and at the same time, the inconvenience due to the protrusion of the grip 2 is eliminated and the assembly becomes easy.

  If the axially and circumferentially-displacement protrusions 1b and 1c are provided on the outer peripheral surface 1a of the shaft cylinder 1, the engagement between the dislocation-preventing protrusions 1b and 1c and the inner peripheral surface 2c of the grip 2 is achieved. The function of preventing displacement of the grip 2 with respect to the axial tube 1 in the axial direction and circumferential direction can be further improved.

  In particular, when the rear end 2e of the grip 2 is held immovably in the axial direction and the circumferential direction with respect to the shaft cylinder 1 by the locking band 3, not only the assemblability and aesthetics are excellent, but also the forward position. Since it is excellent also in the function of preventing displacement, it is preferable.

In the previous embodiment, the rear end 2e of the grip 2 is shown to be held immovably in the axial direction and the circumferential direction with respect to the shaft tube 1 by the locking band 3, but the present invention is not limited to this. Although not limited, even if a portion other than the rear end portion 2e of the grip 2, for example, a substantially central position in the axial direction of the grip 2 or a front end portion of the grip 2 is held immovably in the axial direction and the circumferential direction by the locking band 3. good.
Furthermore, although the case where it arrange | positions so that the elastic ring 6 may be pinched | interposed between the grip 2 and the front opening | mouth 5 was shown in the previous Example, this invention is not limited to this, Without the elastic ring 6 The front end of the grip 2 may be brought into direct contact with the rear end surface of the front opening 5.

  In the illustrated example, the grip 2 is inserted so as to cover substantially the entire axial length of the shaft tube 1, but the present invention is not limited to this, and the insertion position of the grip 2 and the grip 2 are not limited thereto. The overall shape of the grip 2 is not limited to the shape of the illustrated example, and the grip 2 is inserted so as to partially cover only the gripping portion of the shaft tube 1 or the raised portion is formed on the outer peripheral surface 1a at the approximate center in the axial direction of the grip 2. 2a and the inclined curved surface portion 2b may not be formed.

Further, in the illustrated example, a case is shown in which the writing tip 7a of the refill 7 incorporated in the shaft cylinder 1 is always protruded from the tip 3 and is detachably covered with a cap 8. However, the present invention is not limited to this, and a ballpoint pen having a structure in which the writing tip portion 7a is made to appear and disappear by a knocking operation or a rotation operation, or other types such as a mechanical pencil or a sign pen may be used.
Furthermore, although the shaft cylinder 1 has an integral structure that cannot be separated, the present invention is not limited to this, and the shaft cylinder 1 may have an integral structure that can be separated by screwing and joining the front shaft and the rear shaft. good.

1 shows an embodiment of the writing instrument of the present invention, in which (a) is a partially cutaway front view of the entire writing instrument, (b) is a partially enlarged longitudinal front view, and (c) is (1c)-in FIG. It is a partial expanded transverse bottom view which follows (1c). It is a partially notched front view which reduces and shows a decomposition | disassembly state. It is a fragmentary perspective view, (a) shows the state seen from the right side when the locking band is mounted, (b) shows the state seen from the right side when the part is disassembled, (c) Shows a state in which the locking band is viewed from the left side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1d Concave part 2 Grip 3 Locking band 3c Connection part 3d Locking convex part 3e Engaging concave part 4 Cover means (tail plug)

Claims (4)

In the writing instrument having a cylindrical grip made of a soft material on the outer periphery of the shaft cylinder,
A writing instrument characterized in that a locking band is wound in the circumferential direction along the outer peripheral surface of the grip and is held in a ring-like manner at a connecting portion. A locking projection is provided on the inner periphery of the locking band, and the locking projection and a recess formed in the shaft tube are fitted in the radial direction of the shaft tube. The writing instrument according to 1. The writing instrument according to claim 1 or 2, wherein an engagement recess is provided in the locking band, and the surface of the grip compressed and deformed by the locking band is bitten. The writing instrument according to any one of claims 1 to 3, wherein a cover means is provided on the outer side of the locking band so as to be brought into contact with each other so that the diameter cannot be increased.

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