Writing instrument member and writing instrument

Abstract

To provide a writing utensil member capable of variously changing a design at the time of molding without secondary processing.SOLUTION: An exterior body made of a transparent or translucent first resin member and an interior body made of a metal member or a second resin member different from the first resin member are provided, the exterior body and the interior body made of the metal member are integrated by insert molding, the exterior body and the interior body made of the second resin member are integrated by insert molding or two color molding, and a boundary surface between the exterior body and the interior body is subjected to emboss processing.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a writing implement member used in a barrel or the like, and a writing implement using the writing implement member. [Background technology]

[0002] Various innovations have been made to improve the design of molded products such as writing implements. For example, there have been disclosed a pen in which a pattern on the inner surface of a mold is transferred onto a thin metal sheet when the thin metal sheet is insert-molded (see, for example, Patent Document 1), a pen in which an inner shaft with a pattern formed on the inside is inserted into a transparent outer shaft (see, for example, Patent Document 2), a pen in which an inner shaft with a printed pattern is inserted into a transparent outer shaft with an insertion hole of a polygonal cross section (see, for example, Patent Document 3), and a pen in which the inner surface of a cylindrical member made of a light-transmitting material is decorated (see, for example, Patent Document 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 50-76167 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-246885 [Patent Document 3] Japanese Utility Model Application Publication No. 59-122288 [Patent Document 4] International Publication No. 2013 / 008811 Summary of the Invention [Problem to be solved by the invention]

[0004] In the molded articles described in the above Patent Documents 1 to 4, secondary processing (transfer and painting) was required to change the design.

[0005] An object of the present invention is to provide a writing implement component whose design can be varied in a variety of ways during molding without secondary processing, and a writing implement using said writing implement component. [Means for solving the problem]

[0006] The present inventors have completed the present invention in order to solve the above problems. The present invention provides the following.

[0007] (1) The writing instrument member of the present invention comprises an outer body made of a transparent or translucent first resin member, and an inner body made of a metal member or a second resin member different from the first resin member, and the outer body and the inner body made of the metal member are integrated by insert molding, and the outer body and the inner body made of the second resin member are integrated by insert molding or two-color molding. The second resin member being different from the first resin member means that it does not have the same size or shape as the first resin member, and may be molded using the same material as the first resin member. (2) The boundary surface between the outer body and the inner body is characterized by being textured. (3) The metal member or the second resin member that constitutes the inner body is a flapper member. (4) The metal member or the second resin member that constitutes the inner body is a member having a glossy appearance. (5) A writing implement according to the present invention is characterized by having the writing implement component according to any one of (1) to (4). [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a writing implement component whose design can be varied in a variety of ways during molding without secondary processing, and a writing implement using the writing implement component. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are diagrams showing the configuration of a writing implement according to a first embodiment, in which (A) is a front view and (B) is a front vertical cross-sectional view. [Figure 2] 1A to 1C are diagrams showing the configuration of a rear body according to a first embodiment, in which (A) is a perspective view, (B) is a front view, and (C) is a front longitudinal sectional view. [Figure 3] 10A and 10B are diagrams showing the configuration of a writing implement according to a second embodiment, in which (A) is a front view and (B) is a front longitudinal cross-sectional view. [Figure 4] 10A, 10B, and 10C are diagrams showing the configuration of a rear body according to a second embodiment, in which (A) is a perspective view, (B) is a front view, and (C) is a front longitudinal cross-sectional view. [Figure 5] FIG. 10 is a schematic diagram relating to molding according to a second embodiment. [Figure 6] FIG. 2 is a schematic diagram relating to insert molding according to the first embodiment. [Figure 7] FIG. 2 is a schematic diagram relating to molding according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] A writing instrument (cap-type ballpoint pen) according to a first embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows the configuration of the writing instrument according to this embodiment, with FIG. 1(A) being a front view and FIG. 1(B) being a front longitudinal cross-sectional view. Note that the cap is not shown in FIG. 1. The writing instrument 1 has a cylindrical barrel 4. The barrel 4 has a front barrel 6, a rear barrel 8 that fits onto the rear end of the front barrel 6, and a tip member 10 that fits or screws onto the front end of the front barrel 6. A grip 2 is attached to the outer surface of the front barrel 6. An ink tank 11 that contains ink is housed within the barrel 4. A writing part 12 protrudes from the tip of the tip member 10 and is connected to the ink tank 11 via a joint 14.

[0011] FIG. 2 shows the configuration of the rear axle 8, with FIG. 2(A) being a perspective view, FIG. 2(B) being a front view, and FIG. 2(C) being a front longitudinal cross-sectional view. The rear axle 8 comprises an outer tube (exterior body) 18 and an inner tube (interior body) 20. The outer tube 18 is cylindrical, with its front end fitting with the rear end of the front axle 6 and its rear end closed, covering the inner tube 20. The outer tube 18 is made of a transparent or translucent thermoplastic resin material such as polycarbonate (PC), acrylonitrile butadiene styrene (ABS), acrylonitrile styrene (AS), acrylic (PMMA), polystyrene (PS), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), or polyamide (PA), allowing the inner tube 20 to be seen. The outer tube 18 may be colored or colorless.

[0012] The inner tube 20 is cylindrical with a closed rear end and is located inside the outer tube 18. The inner tube 20 is a resin member that is different in material or color from the resin member that constitutes the outer tube 18, and is made of a thermoplastic resin member that has a glossy finish such as silver, metallic, glitter, or pearl. The inner tube 20 may be opaque, transparent, or translucent. The outer tube 18 and inner tube 20 are integrated by two-color molding.

[0013] The boundary surface 22 between the outer cylinder 18 and the inner cylinder 20 is textured. For example, the inner surface of the cavity that forms the outer surface of the inner cylinder 20 is textured (roughness of 20 μm in this embodiment), and by using this cavity to mold the inner cylinder 20, the outer surface of the inner cylinder 20, i.e., the boundary surface 22, is textured. When using a cavity with a textured inner surface, the roughness of the texture may be within a range that allows the inner cylinder 20 to be released from the cavity. In this embodiment, the roughness is 20 μm, but a roughness of approximately 3 μm to 50 μm is desirable. By texturing the boundary surface 22, diffused reflection occurs due to the texture of the boundary surface 22, and it is possible to realize design changes using this diffused reflection.

[0014] In the first embodiment, an example was given in which the inner tube 20 is made of a thermoplastic resin material and the outer tube 18 and the inner tube 20 are integrated by two-color molding, but the inner tube 20 may also be made of a metal material or a thermosetting resin material, etc., and the outer tube 18 and the inner tube 20 may be integrated by insert molding.

[0015] Next, a writing instrument (cap-type ballpoint pen) according to a second embodiment of the present invention will be described. Regarding the writing instrument according to the second embodiment, the same components as those of the writing instrument 1 according to the first embodiment shown in Figs. 1 and 2 are designated by the same reference numerals, and a description of those components will be omitted. Fig. 3 shows the configuration of the writing instrument according to this embodiment, with Fig. 3(A) being a front view and Fig. 3(B) being a front longitudinal cross-sectional view. The cap is not shown in Fig. 3.

[0016] Writing instrument 21 according to the second embodiment includes barrel 24 instead of barrel 4 according to the first embodiment. Barrel 24 includes rear barrel 28 instead of rear barrel 8. Figure 4 shows the configuration of rear barrel 28, with Fig. 4(A) being a perspective view, Fig. 4(B) being a front view, and Fig. 4(C) being a front longitudinal cross-sectional view. Rear barrel 28's inner barrel (inner body) 40 is cylindrical and located within outer barrel 18. Inner barrel 40 is a film-like label member made of a metal member or a resin member whose material and color differ from those of the resin member constituting outer barrel 18, and has a glossy finish such as silver, metallic, glitter, or pearl. The label member may be opaque, transparent, or translucent. Outer barrel 18 and inner barrel 40 are integrated by insert molding.

[0017] The boundary surface 42 between the outer tube 18 and the inner tube 40 is textured. Specifically, the outer surface of the core pin that forms the inner surface of the outer tube 18 is textured (roughness of 20 μm in this embodiment), and the label material that forms the inner tube 40 is wrapped around this core pin before the outer tube 18 is molded. The texture formed on the core pin is transferred to the label material that forms the inner tube 40 by the injection pressure used during molding of the outer tube 18, and the outer surface of the inner tube 40, i.e., the boundary surface 42, is textured. The roughness of the texture may be within a range that allows the inner tube 40 to be released from the core pin. In this embodiment, the roughness is 20 μm, but a roughness of approximately 3 μm to 50 μm is preferable. By texturing the boundary surface 42, the texture on the boundary surface 42 causes diffuse reflection, making it possible to realize design changes using this diffuse reflection.

[0018] Next, examples of molding the inner and outer tubes according to the above-described embodiments will be described. FIG. 5 is a schematic diagram (cross-sectional view) of molding according to a second embodiment. As shown in FIG. 5(A), a core pin 30 has a textured outer surface 32. When a label member 34 is wrapped around the core pin 30 with the textured outer surface 32, as shown in FIG. 5(B), the textured outer surface 32 is transferred to the label member 34, forming an inner tube 40 (see FIG. 4). As shown in FIG. 5(C), a resin member 36 constituting the outer tube 18 (see FIG. 4) is filled between the label member 34 and a fixed mold (not shown), thereby integrating the label member 34 and the resin member 36. The hardened resin member 36 integrated with the label member 34 is released from the core pin 30 by moving the core pin 30 leftward relative to the stripper plate 38 in FIG. 5.

[0019] FIG. 6 is a schematic diagram (cross-sectional view) of the insert molding process according to the first embodiment. After the resin member 52 that constitutes the inner tube 20 (see FIG. 2) is filled between the core pin 50 and a cavity (not shown), a texture 54 is formed on the outer surface and the outer bottom surface of the resin member 52, as shown in FIG. 6(A). The resin member 36 that constitutes the outer tube 18 (see FIG. 2) is filled between the resin member 52 and a fixed mold (not shown), as shown in FIG. 6(B), thereby integrating the resin member 52 and the resin member 36. The integrated and hardened resin member 52 and the resin member 36 are released from the core pin 50 by moving the core pin 50 leftward relative to the stripper plate 38 in FIG. 6, as shown in FIG. 6(C).

[0020] FIG. 7 is a schematic diagram (cross-sectional view) of molding according to the first embodiment. As shown in FIG. 7(A), a texture 62 is formed on the inner surface and inner bottom surface of a cavity 60. When a resin member 64 constituting the inner tube 20 (see FIG. 2) is filled between the core pin 50 and the cavity 60 with the texture 62, as shown in FIG. 7(B), the texture 62 is transferred to the outer surface and outer bottom surface of the resin member 64. After the cavity 60 is demolded, as shown in FIG. 7(C), the resin member 36 constituting the outer tube 18 (see FIG. 2) is filled between the resin member 64 and the fixed mold 66, thereby integrating the resin member 64 and the resin member 36. The integrated and cured resin member 64 and the resin member 36 are released from the fixed mold 66 as shown in FIG. 7(D), and then, as shown in FIG. 7(E), the core pin 50 is moved leftward relative to the stripper plate 38 to be demolded from the core pin 50.

[0021] The writing implements according to the above-described embodiments are provided with an inner tube that can be freely decorated, allowing for a wide variety of designs to be developed during primary processing (molding). Therefore, the design can be improved without the need for secondary processing such as printing or painting. Furthermore, the outer tube that covers the inner tube improves the durability of the design applied to the inner tube.

[0022] In the above-described embodiments, examples have been given in which the outer body of the writing instrument component of the present invention is applied to the outer tube of the rear barrel, and the inner body is applied to the inner tube of the rear barrel. However, the writing instrument component of the present invention can also be applied to writing instrument parts other than the rear barrel, such as external parts of the writing instrument such as the front barrel, barrel, tip member, clip, inner tube, knock rod (knock cover), or internal parts of the writing instrument, or to cosmetic cases, miscellaneous goods, toys, etc. other than writing instrument parts.

[0023] Furthermore, in each of the above-described embodiments, a ballpoint pen has been used as an example of a writing instrument, but it goes without saying that the writing instrument component of the present invention can also be applied to the barrels of writing instruments other than ballpoint pens, such as mechanical pencils, fountain pens, brushes, brush pens, and felt-tip pens. [Industrial Applicability]

[0024] The present invention allows for a wide variety of design possibilities through primary processing such as two-color molding or insert molding, and is an invention that has industrial applicability as a writing implement component and writing implement. [Explanation of symbols]

[0025] 1,21...writing implement, 2...grip, 4...barrel, 6...front barrel, 8,28...rear barrel, 10...tip member, 11...ink tank, 12...writing part, 14...joint, 18...outer barrel, 20,40...inner barrel, 22,42...boundary surface, 30,50...core pin, 32,54,62...grain, 34...label member, 36,52,64...resin member, 38...stripper plate, 60...cavity, 66...fixed side mold.

Claims

1. an exterior body made of a transparent or translucent first resin member; an inner body made of a metal member or a second resin member different from the first resin member; Equipped with A writing instrument component characterized in that the outer body and the inner body consisting of the metal member are integrated by insert molding, and the inner body consisting of the outer body and the second resin member is integrated by insert molding or two-color molding, and the boundary surface between the outer body and the inner body is embossed.

2. 2. The writing implement member according to claim 1, wherein the metal member or the second resin member constituting the inner body is a label member.

3. 2. The writing implement member according to claim 1, wherein the metal member or the second resin member constituting the inner body is a glossy member.

4. A writing implement comprising the writing member according to claim 2 or 3.

Images