Notebook

Abstract

To provide a writing instrument which allows replacement of refill cores of different lengths and thicknesses.SOLUTION: The writing instrument of the present invention includes a collet 12 having a tapered shape and a split end, and formed to be able to support a tip 11a of a refill core 11 inserted from the rear end side, a case 13 having a tapered shape and formed so that the collet 12 supporting the refill core 11 can be inserted from the rear end side, and a body 14 connectable to the case 13 from the rear end side of the case 13. After inserting the collet 12 supporting the tip 11a of the refill core 11 into the case 13, when the body 14 is connected to the case 13 from the rear end side, the rear end of the collet 12 is pressed against the tip of the body 14, and the tip of the collet 12 is pressed against the inner surface of the tip of the case 13, whereby the tip of the refill core 11 is fixed in a state protruding from the tip of the collet 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a writing instrument with replaceable refills. [Background technology]

[0002] Various writing instruments with replaceable refills have been proposed in the past. For example, Patent Document 1 discloses a writing instrument that includes a cylindrical outer barrel with through holes formed through both ends, an inner barrel that is inserted removably into the through hole from an opening at the upper end of the outer barrel and is housed in the outer barrel, a refill held in the inner barrel, and a knob attached to the upper end of the inner barrel, and that is configured so that the tip of the refill can be advanced from the opening at the lower end of the outer barrel by rotating the knob approximately at a right angle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-46837 Summary of the Invention [Problem to be solved by the invention]

[0004] There are currently more than 200 types of refills for general writing instruments commercially available both in Japan and overseas, and this number is expected to increase to more than 300 types in the future. However, the writing instrument described in Patent Document 1 above has a problem in that its structure makes it difficult to accommodate replacement of so many types of refills with different lengths and thicknesses. In addition, the writing instrument described in Patent Document 1 above has a complex structure, which increases the costs of manufacturing and assembling.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a writing instrument that can accommodate replacement of many types of refills with different lengths and thicknesses, and has a simple structure that allows for reduced manufacturing and assembly costs. [Means for solving the problem]

[0006] To solve the above problem, the invention described in claim 1 is a writing instrument with replaceable refills, comprising: a collet with a tapered shape and a split tip, which is formed so that it can support the tip of the refill inserted from the rear end side; a case with a tapered shape and which is formed so that the collet supporting the refill can be inserted from the rear end side; and a body that can be connected to the case from the rear end side of the case. a joint member disposed between the case and the body, screwed to the front end of the body and to the rear end of the case, and formed to be able to abut against the rear end of the collet, After inserting the collet supporting the tip of the refill into the case, the body is inserted into the case from the rear end side. via the joint member When connected, the rear end of the collet Joint material The tip of the collet is pressed against the inner surface of the tip of the case, and the tip of the refill is fixed in a state where it protrudes from the tip of the collet, This writing implement is characterized in that the refill is fixed in the case and the body only by the tip portion of the collet.

[0007] The invention described in claim 2 is a writing instrument described in claim 1, characterized in that three slits are formed in the tip portion of the collet, allowing the tip of the refill to be gripped from three directions, the diameter of the tip of the refill is in the range of 2.1 mm to 2.4 mm, and the tip of the collet is formed so as to be able to support the tip of the refill.

[0008] The invention of claim 3 is the writing implement of claim 1, wherein the collet and the body are connected via an elastic member. [Effects of the Invention]

[0009] According to the present invention, various excellent effects can be obtained, such as the ability to accommodate replacement of many types of refills with different lengths and thicknesses, and the simple structure makes it easy to manufacture and assemble. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an exploded perspective view showing a writing instrument according to an embodiment of the present invention. [Figure 2] 1 is a side view showing a writing instrument according to an embodiment of the present invention. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0011] A writing instrument 10 according to one embodiment of the present invention will be described below with reference to the drawings. Here, Fig. 1 is an exploded perspective view showing the writing instrument 10 according to one embodiment of the present invention, Fig. 2 is a side view showing the writing instrument 10 according to one embodiment of the present invention, and Fig. 3 is a cross-sectional view taken along line AA in Fig. 2.

[0012] First, the configuration of a writing instrument 10 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 3. 。

[0013] A writing instrument 10 according to one embodiment of the present invention is configured to include various types of commercially available refills 11, a collet 12 that detachably supports the refills 11, a case 13 that is formed so that the collet 12 supporting the refills 11 can be inserted from the rear end, a body 14 that can be connected to the case 13 from the rear end, and a cap 15 that is provided to cover the case 13 from the tip end.

[0014] Collet 12 is made of, for example, stainless steel and is composed of a tapered tip portion 12a and a cylindrical rear end portion 12b. Tip portion 12a of collet 12 is split at the tip by three slits 16 formed along the axial direction, and tip portion 11a of refill 11 is provided so that it can be attached and detached.

[0015] Currently, the diameter of the tip portion 11a of all refills 11 sold by manufacturers around the world is in the range of approximately 2.1 to 2.4 mm, and the tip portion 12a of the collet 12 is formed so that it can reliably support the tip portion 11a of refills 11 of these diameters.

[0016] In this embodiment, three slits 16 are formed in the tip portion 12a of the collet 12 so that the tip portion 11a of the refill 11 can be gripped from three directions, but two or four or more slits 16 may be formed in the tip portion 12a of the collet 12 so that the tip portion 11a of the refill 11 can be gripped by the tip portion 12a of the collet 12 from two or four or more directions.

[0017] Case 13 is made of, for example, stainless steel and is composed of a tapered leading end portion 13a and a cylindrical rear end portion 13b. The axial length of case 13 is shorter than the axial length of collet 12, and the inner diameter of case 13 is smaller than the outer diameter of collet 12. In addition, rear end portion 13b of case 13 has a plurality of concave and convex portions 17 formed on the outer periphery, and a female screw portion 18 (see FIG. 3) formed on the inner surface of the rear end portion.

[0018] The body 14 is made of, for example, stainless steel and has a generally cylindrical shape. The body 14 has a cylindrical shaft portion 19 that is open at the front end and closed at the rear end, and a Joint member 20 It is composed of the following:

[0019] Joint member 20 The screw 20 comprises a front end portion 20a that can be threaded into the female screw portion 18 (see FIG. 3) at the rear end of the case 13, and a rear end portion 20b that can be threaded into the front end of the shaft tube portion 19. Joint member 20 The tip end portion 20a is formed to have the same diameter as the rear end portion 12b of the collet 12 and is capable of abutting against the rear end of the rear end portion 12b.

[0020] In this embodiment, Joint member 20 is formed separately from the shaft cylinder portion 19, Joint member 20 may be formed integrally with the tip of the axial tube portion 19. Next, a method for replacing the refill 11 of the writing instrument 10 according to one embodiment of the present invention will be described with reference to FIGS.

[0021] First, with the writing instrument 10 in a state in which the cap 15 is removed as shown in FIGS. 2 and 3, the user separates the body 14 from the case 13 by rotating the body 14 while gripping the case 13.

[0022] Next, the user pulls the refill 11, whose tip 11a is supported by the collet 12, rearward from the case 13. Then, while holding the collet 12, the user pulls the refill 11 attached to the collet 12 rearward, and then inserts a new refill 11 into the collet 12 from the rear end. As a result, the tip 11a of the new refill 11 is gripped from three directions by the tip portion 12a of the collet 12, and the new refill 11 is fixed to the collet 12.

[0023] Next, the collet 12 supporting the new refill 11 is inserted into the case 13, and then the body 14 is screwed onto the rear end of the case 13. Joint member 20 The tip 20a of the collet 12 presses the tip 12a of the collet 12 against the inner surface of the tip 13a of the case 13. As a result, the tip of the refill 11 is fixed in place with the tip of the refill 11 protruding from the tip of the collet 12.

[0024] As described above, the writing instrument 10 according to this embodiment has a structure in which the refill 11 is secured only by the tip portion 12a of the collet 12, making it possible to accommodate replacement of any type of refill 11 regardless of the length or thickness of the refill 11, and to firmly and stably secure the refill 11. Therefore, the refill 11 does not rattle when using the writing instrument 10, providing a stable writing experience.

[0025] Furthermore, the writing instrument 10 of this embodiment has a simple structure in which, when the body 14 is screwed into the case 13, the tip 11a of the refill 11 is fixed to the collet 12 and at the same time the tip 12a of the collet 12 is pressed against the tip 12a of the case 13, making it easy to manufacture and assemble.

[0026] Furthermore, because the collet 12 is a separate part from the body 14, it can move freely when the case 13 is tightened with the body 14. This not only allows the collet 12 to be tightened and fixed with a light force, but also reduces the burden on the refill 11 supported by the collet 12. By reducing the burden on each part in this way, it is possible to extend the life of the writing instrument and there is no risk of the refill 11 becoming loose due to wear.

[0027] Furthermore, in the writing instrument 10 according to the embodiment described above, when the refill 11 is attached, a slight gap G (see FIGS. 2 and 3) will be formed between the rear end of the case 13 and the front end of the body 14 depending on the diameter of the tip portion 11a of the refill 11 fixed to the tip portion 12a of the collet 12, but this slight gap G will not impair the usability of the writing instrument 10 or cause any problems in terms of design. Note that, although not specifically shown, it is also possible to configure the writing instrument 10 so that this gap G does not occur by interposing an elastic member such as a spring or rubber between the collet 12 and the body 14.

[0028] It should be noted that the above description of the embodiments of the present invention describes preferred embodiments of the writing instrument 10 according to the present invention, and therefore may include various technically preferable limitations, but the technical scope of the present invention is not limited to these aspects unless there is a specific description that limits the present invention. [Explanation of symbols]

[0029] 10 Writing instruments 11 Refills 11a (refill) tip 12 Colette 12a (collet) tip 13 cases 13a (case) tip 14 Body 20 Joint material

Claims

1. In writing instruments with replaceable refills, a collet having a tapered shape with a split tip and formed to be able to support the tip of the refill inserted from the rear end side; a case having a tapered shape and formed so that the collet supporting the refill can be inserted from the rear end side; a body connectable to the case from the rear end side of the case; a joint member disposed between the case and the body, screwed to the front end of the body and to the rear end of the case, and formed to be able to abut against the rear end of the collet, A writing instrument characterized in that, after the collet supporting the tip of the refill is inserted into the case, the body is connected to the case from the rear end via the joint member, whereby the rear end of the collet is pressed against the tip of the joint member and the tip of the collet is pressed against the inner surface of the tip of the case, thereby fixing the tip of the refill in a state protruding from the tip of the collet, and the refill is fixed in the case and the body using only the tip portion of the collet.

2. A writing instrument as described in Claim 1, characterized in that three slits are formed in the tip portion of the collet, allowing the tip of the refill to be gripped from three directions, the diameter of the tip of the refill is in the range of 2.1 mm to 2.4 mm, and the tip of the collet is formed so as to be able to support the tip of the refill.

3. 2. The writing implement according to claim 1, wherein the collet and the body are connected via an elastic member.

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