JP2014004772A - Barrel of writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a barrel of a writing instrument, which can bring about a great anti-slip effect and a stable gripping feel.SOLUTION: In a barrel of a writing instrument, a grip made of a soft material is attached to a holding part of the barrel. The grip is characterized in that a plurality of anti-slip parts each including a recess formed in a circumferential shape and a hill part formed on the surface of the grip and having its periphery surrounded by the recess are provided separately from one another in the longitudinal and circumferential directions of the grip, on the surface of the grip.

Description

  The present invention relates to a shaft tube of a writing instrument in which a grip made of a soft material is attached to a grip portion of the shaft tube.

  Conventionally, in the grip of a writing instrument made of a soft material to be attached to the gripping portion of the shaft tube, an uneven portion formed in a concave or convex shape on the outer wall surface of the grip for the purpose of improving the anti-slip effect when gripped. The grips of writing instruments having are well known.

  In order to improve the anti-slip effect and the grip feeling when gripping such a writing instrument, it is disclosed in Japanese Patent Application Laid-Open No. 10-181274, “Grip for Writing Tool”, Japanese Patent Application Laid-Open No. 2003-154882, “Grip”, etc. As described, there is disclosed a grip for a writing instrument in which a groove is formed in the outer wall surface of the grip.

  Japanese Patent Laid-Open No. 2000-326682, “Writing Shaft of Writing Tool” discloses that a groove forming position, a groove depth, a groove width, and the like are specified in order to obtain an appropriate cushion effect.

JP-A-10-181274 Japanese Patent Laid-Open No. 2003-154782 JP 2000-326682 A

  By the way, as in Patent Documents 1 to 3, in order to obtain a higher anti-slip effect and a better grip feeling in the grip in which the groove is formed, the plate-like protrusion obtained by forming the groove is easily deformed. It is important to increase the width and depth of the groove or make the material used soft in order to easily deform the plate-like protrusion.

  However, in order to increase the width and depth of the groove, it is necessary to increase the outer diameter of the grip. For this reason, it is difficult to increase the width and depth of the groove with a small-diameter grip member. Further, if the hardness is specified in order to make the material to be used soft, there is a problem that the usable soft material is limited.

  Further, in Patent Documents 1 to 3, the plate-like protrusions are provided side by side in a certain direction such as the circumferential direction of the grip, and the anti-slip effect is obtained by the plate-like protrusions being deformed and falling in the axis direction of the grip. However, there is a problem that resistance in the axial direction of the grip cannot be obtained, and only resistance in a certain direction in the circumferential direction of the grip can be obtained.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument shaft that makes it possible to obtain a high anti-slip effect and a stable grip feel.

  In order to achieve the above-mentioned object, the present invention provides a shaft tube of a writing instrument in which a grip made of a soft material is attached to a grip portion of the shaft tube, and the grip is formed in a circumferential shape on the surface of the grip. A plurality of non-slip portions provided in the longitudinal direction and the circumferential direction of the grip, each including a recess formed in the grip and a hill formed on the surface of the grip and surrounded by the recess. It is characterized by being.

  Further, the plurality of non-slip portions differing in the longitudinal direction increase the opening area of the recess toward the tip end side of the shaft tube.

  Further, the width of the concave portion is larger than the height of the hill portion.

  Further, the surface of the hill portion is located in substantially the same circular shape as another grip surface adjacent in the radial direction.

  The soft material of the present invention includes elastically deformable silicone rubber, natural rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, polyethylene resin, other synthetic rubbers, thermoplastic elastomers, etc. It can be used by appropriately selecting from the soft materials showing rubbery elasticity known in the art.

  According to a first configuration of the present invention, a slide provided with a recess formed on the surface of the grip, and a hill formed on the surface of the grip and surrounded by the recess. A plurality of stop portions are provided apart from each other in the longitudinal direction and the circumferential direction of the grip, so that the concave portion abuts circumferentially on the surface of the finger gripping the grip, in the longitudinal direction and the circumferential direction. A high anti-slip effect can be achieved in any direction, that is, in a 360-degree direction. In addition, the recess and the hill are simultaneously brought into contact with the surface of the finger gripping the grip, so that the anti-slip effect due to the unevenness is high, and even if the hill is gripped by the finger and deformed by the gripping force, the circumferential recess Since the periphery is surrounded, a stable grip feeling can be obtained in the 360-degree direction. As a result, it is possible to smoothly and surely adapt the surface of the finger gripping the grip, and it is possible to obtain a high anti-slip effect and a stable grip feel in the 360-degree direction.

  In addition, it is preferable to provide a recessed part in the longitudinal direction with the same width | variety and it is circularly provided, and although it may be peripherally provided by the ellipse shape, the ellipse, etc., it is most preferable to set it as a substantially regular circle. Further, the shape of the hill portion can also be selected and used as appropriate, such as a truncated cone or cylinder.

  According to the second configuration of the present invention, the plurality of non-slip portions differing in the longitudinal direction increase the opening area of the concave portion toward the tip end side of the shaft tube, so that it is effective in an actual use state. The anti-slip action can be obtained. This is because when the grip is attached to the shaft of the writing instrument and the user grips and writes the grip, the finger pressure of the user's finger is determined by the force in the centripetal direction of the shaft to grip the grip and the tip of the writing The force to the front end side of the writing instrument which is going to press a part against a paper surface is needed. Therefore, the user's finger tries to slide toward the tip side of the writing instrument with respect to the cylinder, but since the opening area of the recess increases toward the tip side of the writing instrument, the surface of the finger sinks into the recess, and the recess and the finger This is because the contact area of the finger increases and the sliding of the finger forward can be effectively prevented. In order to increase the opening area of the recess, for example, the groove width can be increased with the same outer diameter and / or the outer diameter can be increased with the same groove width. It is preferable to increase the groove width and the outer diameter.

  According to the third configuration of the present invention, since the width of the recess is larger than the height of the hill, even if the hill is gripped by a finger and deformed by a gripping force, Since it does not contact the outer surface of the grip, it is possible to obtain a stable grip feeling. In addition, the height of the said hill part shows the maximum height from the bottom face of a recessed part to the surface of the said hill part.

  The present invention has been able to provide a writing instrument shaft that makes it possible to obtain a high anti-slip effect and a stable grip feel.

It is a figure which shows one Embodiment of the axial cylinder of the writing instrument of this invention. It is the external view seen from the upper surface in FIG. FIG. 3 is an enlarged external view of a main part, partly omitted in FIG. 2. It is AA sectional drawing in FIG.

  Next, the shaft of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

Next, with reference to FIGS. 1-4, the axial cylinder 1 of the writing instrument which concerns on this embodiment is demonstrated.
A shaft cylinder 1 of this writing instrument is formed by screwing a front shaft 2 and a rear shaft 3 to form a shaft body. The grip portion of the front shaft 2 is formed with a small outer diameter, and a grip 4 is attached to the grip portion.

  Further, in the shaft cylinder body, a ballpoint pen refill with a ballpoint pen tip 12 mounted on the tip end portion of the ink containing cylinder 11 is urged rearward by a coil spring 8 and stored in the rear shaft 3. By pressing the knocking body 6 with the protruding and retracting mechanism 7, the tip of the ball-point pen tip 12 can be projected and retracted from the tip opening 2 </ b> A of the front shaft 2. Although not shown in the drawing, the ink containing cylinder 11 is directly packed with water-based ballpoint pen ink having shear thinning viscosity and a grease-like ink follower at the rear end of the ink. Further, the clip 9 is disposed on the rear shaft 3 by a coil spring 10 so that the tip of the clip 9 is pressed against the outer peripheral surface of the rear shaft 3.

  The grip 4 is formed by injection molding using a colored transparent olefinic thermoplastic elastomer having a Shore hardness of Hs (JIS A) 70 as a soft material. The grip 4 has a substantially cylindrical shape.

  The surface of the grip 4 is provided with a non-slip portion 5 having a recess 5A formed discontinuously in the circumferential direction and circumferentially formed in the longitudinal direction, and a hill portion 5B surrounded by the recess 5A. is there. The anti-slip portions 5 are arranged at four positions in the longitudinal direction at a predetermined pitch P, and six pieces are formed at a predetermined angle α pitch in the circumferential direction.

  Further, in the present embodiment, in the circumferential direction, the recess 5A and the hill portion 5B are provided with six antiskid portions 5 having the same shape, and in the longitudinal direction, the groove width (M, N) of the recess 5A and the outside of the groove are provided. The diameters (G, H) are increased toward the tip direction (M> N, G> H), and the outer diameter of the hill portion 5B is also increased toward the tip direction. Moreover, in each non-slip | skid part 5, the width | variety (M, N) of 5 A of recessed parts is made larger than the height L of the hill part 5B. In the present embodiment, the depth of the recess 5A is the same.

  Moreover, the surface of the hill part 5B is made into the substantially same circumferential shape as the other grip surface between the antiskid parts 5 adjacent in radial direction. As shown in FIG. 1, the length pitch P indicates a distance between two antiskid portions 5 adjacent in the longitudinal direction, and the angle pitch (α) is adjacent in the circumferential direction as shown in FIG. The space | interval between the two antiskid parts 5 to show is shown.

  The non-slip portion 5 will be described in detail. In actual writing, the axial direction J is not perpendicular to the paper surface, and a writing angle is generated. Therefore, the writing pressure is not only applied parallel or perpendicular to the axial direction J, but also the thumb and forefinger. Various gripping forces are applied, such as the closing direction. For this reason, the anti-slip effect is high in the 360-degree direction by the anti-skid part provided with the concave part formed in a circumferential shape in the longitudinal direction and the hill part surrounded by the concave part. Further, since the non-slip portion 5 has a step between the concave portion 5A and the hill portion 5B, the surface area (contact area) increases, and further, for example, in the axial direction J, a gripping force is applied to the tip opening portion 2A side. However, the anti-slip effect can be enhanced by the two steps S and T of the anti-slip part 5.

  In this embodiment, the grip and the shaft cylinder body are integrally formed by two-color molding to be attached to the grip portion of the shaft cylinder body. You may wear it. When molding the grip and the barrel body in two colors, the gate position of the grip can be made non-slip so that the gate mark is less noticeable from the appearance, and the gate position is provided on the surface of the hill. Thus, it becomes possible to improve the gate breakage.

  Further, the shape of the grip 4 is not limited to a strictly cylindrical shape having the same diameter in the axial direction J, and when the radius slightly varies with respect to the axial direction J, for example, a barrel shape or the like It may be the case. Moreover, not only a cylindrical shape but square tube shape may be sufficient.

  Furthermore, the predetermined length pitch (P) and the predetermined angle pitch (α) can be appropriately selected in consideration of the overall length, outer diameter, etc. of the grip. According to the results of the experiment, the outer diameter of the non-slip portion is 1.0 mm to 3.0 mm, the predetermined length pitch is 2.0 mm to 5.0 mm, and the predetermined inclination angle is 30 in consideration of individual differences and the like. It was confirmed that it is preferably in the range of 60 to 60 degrees. Further, although the groove width and depth of the recess are not particularly limited, the width of the recess is preferably larger than the height of the hill, and the bottom surface of the recess is particularly limited to be flat or arcuate. is not.

  The shaft tube of the writing instrument of the present invention is not limited to the type of the writing body, the knock type, and the cap type, and can be widely implemented as a shaft tube of the shaft tube.

DESCRIPTION OF SYMBOLS 1 Writing shaft 2 Front shaft 2A Front opening 3 Rear shaft 4 Grip 5 Non-slip 5A Recess 5B Hill 6 Knock body 7 Rotating cam 8 Coil spring 9 Clip 10 Coil spring 11 Ink storage cylinder 12 Ball-point pen tip 13 Tip holder J Axis center P Longitudinal pitch α Circumferential angle M, N Outer diameter of non-slip part m, n Width of recess part of anti-slip part S, T Step

Claims (3)

  A shaft of a writing instrument in which a grip made of a soft material is attached to a gripping portion of the shaft, wherein the grip is formed on the surface of the grip, a recess formed in a circumferential shape, and the surface of the grip A shaft cylinder of a writing instrument, wherein a plurality of non-slip portions are provided that are formed and are surrounded by the concave portion and spaced apart in the longitudinal and circumferential directions of the grip.   2. The shaft cylinder of the writing instrument according to claim 1, wherein the plurality of non-slip portions different in the longitudinal direction increase the opening area of the recess toward the tip side of the shaft cylinder.   The shaft cylinder of the writing instrument according to claim 1 or 2, wherein a width of the concave portion is larger than a height of the hill portion.

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