Writing instrument

Abstract

To provide a writing utensil which enables stable writing by preventing a refill from rotating around an axial center in a cylindrical case.SOLUTION: A writing instrument in which a refill is housed in a cylindrical case, wherein the refill does not rotate around an axial center.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART Conventionally, as writing implements, a writing implement with a chisel-shaped tip as described in Patent Document 1 and a knock-type writing implement as described in Patent Document 2 are known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-78332 [Patent Document 2] Registered Utility Model No. 3159535 Summary of the Invention [Problem to be solved by the invention]

[0004] In writing instruments equipped with a chisel-shaped tip such as that described in Patent Document 1 above, there was a problem in that writing with a chisel-shaped tip that is asymmetrical with respect to the axis of the writing instrument could cause the refill to rotate around the axis inside the cylindrical case, making it difficult to write as desired. Furthermore, in a knock-type writing instrument such as that described in Patent Document 2 above, the rotor of the knock mechanism abuts against the rear end of the refill, and as this rotor rotates due to the knock operation, the refill may rotate around its axis. When using a writing instrument, some users write using the same part of the tip to maintain a stable writing feel each time, and such users hold the writing instrument so that the grip position in the circumferential direction remains the same. However, as described above, when the refill rotates due to the knock operation, the rotational positions of the cylindrical case and the refill around the axis change, which creates the problem that writing cannot be done using the same part of the tip.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a writing instrument that allows stable writing by preventing the refill from rotating around its axis within the cylindrical case. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention has the following configuration. A writing instrument in which a refill is stored in a cylindrical case, The writing implement is characterized in that the refill is configured not to rotate around its axis. [Effects of the Invention]

[0007] The writing implement of the present invention allows stable writing because the refill does not rotate around its axis within the cylindrical case. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view of a knock-type marking pen 1 according to an embodiment of the present invention. [Figure 2] 1 is an exploded view of a knock-type marking pen 1 according to an embodiment of the present invention. [Figure 3] 1 is a partial vertical cross-sectional view of a knock-type marking pen 1 according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. [Figure 5] 1 is a development view showing the engagement between a cylindrical case 2 and a refill 4 of a knock-type marking pen 1 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment] Hereinafter, a knock-type marking pen 1, which is an embodiment of a writing instrument according to the present invention, will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts with the same functions, and duplicated descriptions in each drawing will be omitted as appropriate. The long axis direction of the knock type marking pen 1 is simply referred to as the "axis direction," and the center of the axis direction is referred to as the axis center. Furthermore, the direction along the diameter of the cross section is called the radial direction, and the direction along the periphery of the cross section is called the circumferential direction. In addition, the side of the knock-type marking pen 1 from which the refill 4 appears is called the front or tip, and the opposite side is called the rear.

[0010] [Overall configuration] The knock-type marking pen 1 of this embodiment has a cylindrical case 2, a tip 3, a refill 4 and a knock mechanism 5 stored in the cylindrical case 2 and tip 3, and a clip 6 provided on the outer surface of the cylindrical case 2. A refill 4 is housed replaceably in the cylindrical case 2, and a knock mechanism 5 is housed at the rear of the refill 4. A tip 3 is attached to the front side of the cylindrical case 2, and a knock mechanism 5 causes a tip 41 at the front end of the refill 4 to appear and disappear from a front end opening 31 of the tip 3.

[0011] [Cylindrical case and tip] In this embodiment, the cylindrical case 2 is formed in a cylindrical shape, and a rear end opening 21 for allowing the knock member 51 to protrude is formed at the rear end of the cylindrical case 2, and a female screw 2a for attaching the tip end 3 is formed at the front end. The cylindrical case 2 is provided with a knock mechanism 5, and a cylindrical case side meshing portion 22 is integrally molded in front of the knock mechanism 5 so as to protrude inward. The cylindrical case side meshing portion 22 may be integrally molded with the cylindrical case 2, or may be formed separately and fixed to the cylindrical case 2 by adhesive or the like. A clip 6 is provided on the outer peripheral surface of the rear side of the cylindrical case 2. The clip 6 may be a binder clip that can be opened and closed by a spring or the like. The tip opening 3 is attached with a screw to the tip of the cylindrical case 2. A male screw 3a attached to the cylindrical case 2 is formed at the rear end of the tip opening 3, and a tip opening 31 for inserting and retracting the tip 41 of the refill 4 is formed at the tip end. In this embodiment, the pen is configured with one cylindrical case 2 and one tip opening 3, but the cylindrical case 2 may be divided into two or more members, or may not have a tip opening 3. Also, a tip opening of a predetermined length or longer can be said to be a cylindrical case. Furthermore, as a means for connecting and separating a plurality of members, other arbitrary engaging means, fitting means, etc. may be used in addition to screws. In addition, in this embodiment, the cylindrical case 2 and the tip 3 are round cylinders with a circular cross section, but this is not limited to this, and the cross section may be any shape, such as a polygon such as a triangle, a rectangle, or a hexagon, or an ellipse.

[0012] [Refill] In this embodiment, the refill 4 is a marker refill, and has a cylindrical ink containing portion . In this embodiment, the tip of the tip 41 of the refill 4 is formed into a chisel shape. The refill 4 has a known structure, and detailed description thereof will be omitted. A refill-side engaging portion 43 is integrally molded so as to protrude outward from the outer peripheral surface of the ink containing portion 42. The refill-side engaging portion 43 may be integrally molded with the ink containing portion 42, or may be formed separately and fixed to the ink containing portion 42 by adhesive or the like.

[0013] [Knock mechanism] The knock mechanism 5 is a known knock mechanism having a knock member 51 and a rotor 52. The refill 4 is biased rearward by a coil spring 7. The knock mechanism 5 has a known structure, and a detailed description thereof will be omitted. In this embodiment, the knock member is a knock button that protrudes from the rear end of the cylindrical case 2, but it may also be a side knock provided on the outer periphery of the cylindrical case 2 or the clip 6 may be used as a side knock. Furthermore, although a compression coil spring is used as the coil spring 7, a tension coil spring may be used, or a biasing member other than a coil spring may be used, and the arrangement within the cylindrical case 2 and the tip opening 3 may also be changed as appropriate.

[0014] [Rotation prevention mechanism] The knock-type marking pen 1 of this embodiment has a rotation prevention mechanism for preventing the refill 4 from rotating around the axis within the cylindrical case 2 and the tip opening 3. The rotation prevention mechanism is made up of a cylindrical case side meshing portion 22 provided on the inner peripheral surface of the cylindrical case 2 and a refill side meshing portion 43 provided on the outer peripheral surface of the refill 4. As described above, the cylindrical case side interlocking portion 22 is integrally molded on the inner peripheral surface of the cylindrical case 2 so as to protrude inward, with the cylindrical case side interlocking base 22a formed circumferentially on the rear side, and two cylindrical case side interlocking protrusions 22b extending axially toward the tip formed in front of the cylindrical case side interlocking base 22a. The cylindrical case side interlocking protrusions 22b are formed in two locations 180° apart in the circumferential direction. As described above, the refill-side interlocking portion 43 is integrally molded so as to protrude outward from the outer peripheral surface of the ink containing portion 42 of the refill 4, with the refill-side interlocking base 43a formed circumferentially on the front side and two refill-side interlocking projections 43b formed axially toward the rear end on the rear side of the refill-side interlocking base 43a. The refill-side interlocking projections 43b are formed in two locations 180° apart circumferentially. It is not necessary for the cylindrical case side interlocking base 22a and the refill side interlocking base 43a to be formed along the entire circumference. Furthermore, the cylindrical case side interlocking protrusion 22b and the refill side interlocking protrusion 43b are not limited to two, and may be one, or three or more. Furthermore, the cylindrical case side engaging portion 22 and the refill side engaging portion 43 may have any shape as long as the cylindrical case 2 and the refill 4 do not rotate around the axis.

[0015] When the refill 4 is inserted from the tip side of the cylindrical case 2, the cylindrical case side interlocking protrusion 22b and the refill side interlocking protrusion 43b interlock, and the refill 4 can no longer rotate around its axis within the cylindrical case 2 and the tip opening 3, and the rotational position of the refill 4 relative to the cylindrical case 2 is fixed. The tip end of the cylindrical case side interlocking protrusion 22b and the rear end of the refill side interlocking protrusion 43b are each formed in a mountain shape, and when the refill 4 is inserted into the cylindrical case 2, even if the positions of the refill 4 and the cylindrical case 2 in the rotational direction around the axis are slightly misaligned, the cylindrical case side interlocking protrusion 22b and the refill side interlocking protrusion 43b are guided by the inclined surface forming the mountain shape, so that they can smoothly interlock with each other.

[0016] As described above, instead of the configuration in which the refill 4 is inserted from the front end side of the cylindrical case 2 and the cylindrical case side interlocking protrusion 22b and the refill side interlocking protrusion 43b interlock with each other, it is also possible to configure the refill 4 to be inserted from the rear end side of the cylindrical case 2 and the cylindrical case side interlocking protrusion 22b and the refill side interlocking protrusion 43b interlock with each other. Furthermore, instead of the above-described configuration in which the cylindrical case side engaging portion 22 is provided on the inner peripheral surface of the cylindrical case 2, a configuration in which the cylindrical case side engaging portion 22 is provided on the inner peripheral surface of the tip opening 3 may also be adopted.

[0017] [Chip rotation position] In this embodiment, a chisel-shaped tip 41 is used, and the position of the chisel-shaped tip in the rotational direction around the axis is arranged and fixed at a specific position relative to the position of the clip 6. 1, tip 41, which has a shape in which the tip is cut obliquely relative to the axis, is positioned so that its predetermined position is on an extension of clip 6. For this reason, cylindrical case side interlocking protrusion 22b and refill side interlocking protrusion 43b are positioned at predetermined positions, and when refill 4 is inserted into cylindrical case 2, tip 41 is inserted so that its predetermined position is on an extension of clip 6. By arranging the rotational position of tip 41 in this way relative to clip 6, the user can grasp the tip at the desired gripping position by using not only the shape of the tip end of tip 41 but also clip 6 as a guide. In other words, clip 6 can be used as a gripping position specifying part that can specify the gripping position in the circumferential direction of the writing implement. It is also possible to arrange the chip 41 at a predetermined position other than on an extension line of the clip 6 . Furthermore, in a writing instrument that does not have a clip 6, by aligning the rotational position of the tip 41 with the position of the exterior markings such as the product name printed on the outer periphery of the cylindrical case (including the tip), the writing instrument can be held in a desired gripping position using the position of the exterior markings such as the product name printed as a guide. In other words, the position of the exterior markings such as the product name printed can be used as a gripping position specifying part that can specify the gripping position in the circumferential direction of the writing instrument.

[0018] In this embodiment, the rotational position of the tip does not change relative to the cylindrical case, even for tips with directional tip shapes (asymmetrical with respect to the axis) such as the chisel shape, beetle shape, and non-directional tip shapes (symmetrical with respect to the axis) such as the bullet shape. Furthermore, the user can always hold the writing instrument in the same position by using the position of the grip position specifying part, such as the clip or the printed product name, as a guide. In this way, if the writing implement is always held in the same position, the same position of the tip is always used for writing, allowing the user to always write with the same writing style and achieving a stable writing feel.

[0019] The writing implement may be any type of writing implement, and may be a knock-type marking pen as in the above-described embodiment, a ballpoint pen, a felt-tip pen, etc. Furthermore, the writing implement may be one that does not have a knock mechanism.

[0020] The knock-type marking pen 1 according to an embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the present invention also includes design changes that do not deviate from the gist of the present invention. [Explanation of symbols]

[0021] 1 Knock-type marking pen 2 cylindrical cases 2a female thread 21 Rear end opening 22 Cylindrical case side engagement portion 22a Cylindrical case side engagement base 22b Cylindrical case side engagement protrusion 3 tip 3a male thread 31 Tip opening 4 Refill 41 chips 42 Ink storage section 43 Refill side engagement part 43a Refill side engagement base 43b Refill side engagement protrusion 5 Knock mechanism 51 Knock parts 52 rotor 6 clips 7 Coil spring

Claims

1. A writing instrument in which a refill is stored in a cylindrical case, The writing implement is characterized in that the refill is configured not to rotate around its axis.

2. an inner peripheral surface of the cylindrical case is provided with a cylindrical case side meshing portion extending in the axial direction, The refill has an outer peripheral surface provided with a refill-side meshing portion extending in the axial direction, 2. The writing implement according to claim 1, wherein the refill is prevented from rotating around its axis by the engagement portion on the cylindrical case side and the engagement portion on the refill side.

3. 3. The writing implement according to claim 2, wherein the refill is inserted into the cylindrical case, so that the cylindrical case-side engaging portion and the refill-side engaging portion engage with each other.

4. 2. The writing implement according to claim 1, wherein the cylindrical case has an outer peripheral surface provided with a grip position identifying portion that identifies a grip position of the writing implement in the circumferential direction.

5. 5. The writing implement according to claim 4, wherein the grip position specifying portion is a clip.

6. 6. The writing implement according to claim 1, wherein the cylindrical case is a tip of the writing implement.

7. 6. The writing implement according to claim 1, wherein the tip of the refill has a directional tip shape.

8. 6. The writing implement according to claim 1, further comprising a knock mechanism for causing the refill to extend and retract.

Images