Writing instrument component and writing instrument

Abstract

To suppress entanglement between two writing instrument components each having a claw portion.SOLUTION: A writing instrument component 70 comprises: a main body portion 73; a plurality of claw portions 80 that extends in an axial direction da from the main body portion 73 and is arranged in a circumferential direction; and an entanglement prevention portion 90 configured to suppress entanglement of the claw portions 80 with other components.SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

[0002] Among the parts for a writing instrument that make up a writing instrument, there is a part that has a claw portion. Patent Document 1 discloses an example of a part for a writing instrument that has a claw portion (a pen core holder 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 2605695 Summary of the Invention [Problem to be solved by the invention]

[0004] When manufacturing a writing instrument, the components that make up the writing instrument are transported by a parts feeder or the like and assembled together. In this process, if a writing instrument component with a claw portion is transported by a parts feeder or the like, the claw portion may become entangled with another writing instrument component, making it difficult to separate. In this case, the entangled writing instrument components cannot be assembled as is, and a worker must manually separate the two writing instrument components. This causes inconvenience in the manufacturing of writing instruments.

[0005] The present inventors have investigated this phenomenon of two writing instrument parts becoming entangled, and have found two causes for this phenomenon. The first cause is that the claw of another writing instrument part becomes caught in the gap formed between two circumferentially adjacent claws, preventing it from coming out. The second cause is that the main body of another writing instrument part becomes caught in the gap formed between two circumferentially adjacent claws, preventing it from coming out.

[0006] 24 and 25 are diagrams for explaining the first cause, showing an example of how the claws of writing instrument parts become entangled. As particularly clearly shown in FIG. 25, two writing instrument parts become entangled when the claws of another writing instrument part get caught in a gap formed between two circumferentially adjacent claws. While not limited to this case, this is particularly likely to occur when the radial thickness of the claws of one writing instrument part is slightly larger than the width of the gap between the other writing instrument parts. This occurs because, when the claws of one writing instrument part enter the gap between the other writing instrument parts, the claws of the other writing instrument part elastically deform, and the force of these claws trying to return to their original shape presses down on the claws located in the gap.

[0007] 26 and 27 are diagrams for explaining the second cause, showing an example of how the claws of writing instrument components become entangled. As particularly clearly shown in FIG. 27, the two writing instrument components become entangled when the main body of another writing instrument component becomes caught in the gap formed between two circumferentially adjacent claws. While not limited to this case, this is particularly likely to occur when the radial thickness of the main body of one writing instrument component is slightly larger than the width of the gap between the other writing instrument components. This occurs because, when the main body of one writing instrument component enters the gap between the other writing instrument components, the claws of the other writing instrument component elastically deform, and the force of the claws as they return to their original shape presses down on the main body located in the gap.

[0008] The present invention has been made in consideration of these points, and aims to solve at least one of the problems caused by the above two causes, that is, to prevent two writing instrument components having claw portions from becoming entangled with each other. [Means for solving the problem]

[0009] The writing instrument component of the present invention comprises: [1] A main body, a plurality of claws extending from the main body in the axial direction and arranged in the circumferential direction; and an entanglement prevention portion that prevents the claw portion from entangling with other components.

[0010] The writing instrument component of the present invention comprises: [2] A writing instrument part as described in [1], wherein in the tangle prevention portion, the minimum distance between two adjacent claw portions in the circumferential direction is smaller than the maximum radial thickness of the claw portions.

[0011] The writing instrument component of the present invention comprises: [3] A writing instrument part as described in [1] or [2], wherein in the tangle prevention portion, the minimum distance between two adjacent claw portions in the circumferential direction is smaller than the minimum radial thickness of the claw portions.

[0012] The writing instrument component of the present invention comprises: [4] The writing implement component according to any one of [1] to [3], wherein the tangle-preventing portion has a bulging portion that reduces the distance between two of the claw portions that are adjacent in the circumferential direction.

[0013] The writing instrument component of the present invention comprises: [5] The entanglement suppression portion has a thick portion formed on the main body portion, The writing implement component according to any one of [1] to [4], wherein the radial thickness of the thick portion is greater than the minimum distance between two of the claw portions adjacent in the circumferential direction.

[0014] The writing instrument component of the present invention comprises: [6] The thick portion includes a plurality of ribs that protrude inward of the main body portion and extend in the axial direction, [5] A writing instrument part as described above, wherein when viewed from the radial direction, the rib is arranged in axial alignment with the gap formed between two adjacent claw portions.

[0015] The writing instrument component of the present invention comprises: [7] The writing instrument part is a part to be attached to the barrel of the writing instrument, The writing implement component according to any one of [1] to [6], wherein the claw portions are deformed inward when attached to the barrel.

[0016] The writing instrument of the present invention comprises: [8] A barrel, a tip member having a writing portion for forming handwriting; and the writing instrument component according to any one of [1] to [7], which is attached to the barrel so that the plurality of claw portions are located outside the tip member; The writing implement component is a writing implement that holds the tip member when attached to the barrel.

[0017] The writing instrument of the present invention comprises: [9] A writing instrument as described in [8], wherein when the writing instrument part is attached to the barrel, the claw portion deforms inward and contacts the tip member, thereby restricting axial movement of the tip member relative to the writing instrument part. [Effects of the Invention]

[0018] According to the present invention, in a writing implement part having a claw portion, it is possible to prevent two writing implement parts from becoming entangled with each other. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing one embodiment of the present invention, and is an external view showing an example of a writing implement. [Figure 2] FIG. 2 is a vertical cross-sectional view of the writing instrument of FIG. [Figure 3] FIG. 3 is a front view of the writing instrument of FIG. [Figure 4] FIG. 4 is a perspective view showing a writing implement component (holding member) of the writing implement. [Figure 5] FIG. 5 is a half-cut perspective view showing a writing implement component. [Figure 6A]6A is a diagram illustrating an example of a process for attaching the tip member and the writing instrument component to the barrel, and is a vertical cross-sectional view corresponding to the line AA in FIG. 3. FIG. [Figure 6B] 6B is a diagram illustrating an example of a process for attaching the tip member and the writing instrument component to the barrel, and is a vertical cross-sectional view corresponding to line BB in FIG. 3. FIG. [Figure 7A] 7A is a diagram illustrating an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line AA in FIG. 3. FIG. [Figure 7B] FIG. 7B is an enlarged view of the portion marked 7B in FIG. 7A. [Figure 7C] 7C is a view for explaining an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line BB in FIG. [Figure 7D] FIG. 7D is an enlarged view of the portion labeled 7D in FIG. 7C. [Figure 8A] 8A is a diagram illustrating an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line AA in FIG. 3. FIG. [Figure 8B] FIG. 8B is an enlarged view of the portion marked 8B in FIG. 8A. [Figure 8C] 8C is a view for explaining an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line BB in FIG. 3. FIG. [Figure 8D] FIG. 8D is an enlarged view of the portion marked 8D in FIG. 8C. [Figure 9A] 9A is a diagram illustrating an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line AA in FIG. 3. FIG. [Figure 9B] FIG. 9B is an enlarged view of the portion marked 9B in FIG. 9A. [Figure 9C] 9C is a view for explaining an example of a process for attaching the tip member and the writing instrument part to the barrel, and is a vertical cross-sectional view corresponding to the line BB in FIG. 3. FIG. [Figure 9D]FIG. 9D is an enlarged view of the portion marked 9D in FIG. 9C. [Figure 10] FIG. 10 is a perspective view of the writing implement part, illustrating an example of an entanglement prevention portion of the writing implement part. [Figure 11] FIG. 11 is a side view showing the writing implement component of FIG. [Figure 12] FIG. 12 is a view showing the claw portion of the writing implement component of FIG. 10 as viewed from the tip end side. [Figure 13] FIG. 13 is a half-cut perspective view showing the writing implement component of FIG. [Figure 14] 14 is a vertical cross-sectional view showing the writing implement component of FIG. [Figure 15] FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. [Figure 16] FIG. 16 is a perspective view showing a modified example of a writing implement part. [Figure 17] FIG. 17 is a side view showing the writing implement component of FIG. [Figure 18] FIG. 18 is a perspective view showing another modified example of the writing implement component. [Figure 19] FIG. 19 is a side view showing the writing implement component of FIG. [Figure 20] FIG. 20 is a perspective view showing yet another modified example of a writing implement component. [Figure 21] FIG. 21 is a side view showing the writing implement component of FIG. 20. [Figure 22] FIG. 22 is a perspective view showing yet another modified example of a writing implement component. [Figure 23] 23 is a side view showing the writing implement component of FIG. 22. FIG. [Figure 24] FIG. 24 is a side view showing an example of how the claw portions of the writing implement component are entangled. [Figure 25] FIG. 25 is a perspective view showing an example of how the claw portions of the writing implement component are entangled. [Figure 26] FIG. 26 is a side view showing another example of how the claw portions of the writing implement parts are entangled. [Figure 27]FIG. 27 is a perspective view showing another example of how the claw portions of the writing implement component are entangled. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of the present invention will now be described with reference to the drawings. In the drawings attached to this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

[0021] Furthermore, terms used in this specification that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​of lengths and angles, are not to be construed as being bound by strict meanings, but rather as including a range within which similar functions can be expected.

[0022] In this specification, the direction in which the central axis A of the writing instrument 10 extends (longitudinal direction, up-down direction in a vertical cross section) is referred to as the axial direction da, the direction perpendicular to the axial direction da is referred to as the radial direction, and the direction along the circumference around the central axis A is referred to as the circumferential direction. Along the axial direction da, the side that approaches a writing surface such as a piece of paper when writing (the upper side in a vertical cross section) is referred to as the front, and the side that moves away from the writing surface (the lower side in a vertical cross section) is referred to as the rear. Along the radial direction, the side that approaches the central axis A is referred to as the inside or inner side, and the side that moves away from the central axis A is referred to as the outside or outer side.

[0023] FIG. 1 is a diagram showing one embodiment of the present invention, and is an external view showing an example of a writing instrument 10. FIG. 2 is a longitudinal cross-sectional view of the writing instrument 10. FIG. 3 is a view of the writing instrument 10 as seen from the front. FIG. 4 is a perspective view showing a writing instrument component 70 of the writing instrument 10. FIG. 5 is a half-cut perspective view showing the writing instrument component 70. In particular, FIG. 5 shows the writing instrument component 70 cut along a plane including the central axis A of the writing instrument 10. Note that to avoid complicating the drawings, the tangle prevention unit 90 is not shown in FIGS. 1 to 9D, and only the basic configuration is described. The tangle prevention unit 90 will be described later with reference to FIGS. 10 to 23.

[0024] The writing instrument 10 of this embodiment is, for example, a marking pen (marker), a felt-tip pen, etc. In this embodiment, an example will be described in which the writing instrument 10 is a marking pen. The writing instrument 10 includes an ink reservoir 11, a barrel 15, a tip member 50, and a writing instrument component 70.

[0025] The barrel 15 extends in the axial direction da along the central axis A of the writing instrument 10. Therefore, the central axis of the barrel 15 coincides with the central axis A of the writing instrument 10. The barrel 15 includes a front barrel 20 and a rear barrel 40 attached to the rear end of the front barrel 20.

[0026] The front barrel 20 is a member that forms the front portion of the writing instrument 10. The front barrel 20 has a generally cylindrical shape. The central axis of the front barrel 20 coincides with the central axis A of the writing instrument 10. The rear barrel 40 is a member that forms the rear portion of the writing instrument 10. The rear barrel 40 has a generally cylindrical shape. The central axis of the rear barrel 40 coincides with the central axis A of the writing instrument 10. In this embodiment, the rear barrel 40 is intended to be grasped with the fingers of a user when writing with the writing instrument 10. The rear barrel 40 may include an inner barrel and a grip portion disposed on the outside of the inner barrel. The grip portion is a portion that is held with the fingers of a user when writing with the writing instrument 10. However, this is not limited thereto, and the writing instrument 10 may also be configured so that the user grasps the front barrel 20 to write. In this embodiment, the front barrel 20 is attached to the rear barrel 40 by inserting the rear end portion of the front barrel 20 into the front end portion of the rear barrel 40. For example, front barrel 20 may be attached to rear barrel 40 by press-fitting the rear end of front barrel 20 into the front end of rear barrel 40. Alternatively, front barrel 20 may be attached to rear barrel 40 by a front barrel-side convex portion formed on the outer peripheral surface of the rear end of front barrel 20 climbing over a rear barrel-side convex portion formed on the inner peripheral surface of the front end of rear barrel 40 and becoming engaged with said rear barrel-side convex portion. A flange 21 is formed on the outer peripheral surface of front barrel 20. In a state in which front barrel 20 is attached to rear barrel 40, flange 21 may come into contact with the front end of rear barrel 40. A cap member that covers tip member 50 and prevents ink from drying out on tip member 50 may be attached to front barrel 20 or writing instrument component 70.

[0027] The inner surface of front barrel 20 is formed with groove 23, pressing surface 27, and latched portion 29. Groove 23 is a groove that receives outer rib 72 and protrusion 82 (described later) of writing instrument component 70 when writing instrument component 70 is attached to front barrel 20. Groove 23 is formed to be recessed radially outward from the inner circumferential surface of front barrel 20. Each groove 23 extends linearly along axial direction da. Multiple grooves 23 may be arranged at equal angular pitches relative to one another in the circumferential direction. In the present embodiment, front barrel 20 has four grooves 23. The four grooves 23 are arranged at angular pitches of 90 degrees relative to one another. This is not a limitation, and front barrel 20 may have two, three, five, or more grooves 23. A barrel-side inclined surface 25 is formed at the rear end of groove 23. Barrel-side inclined surface 25 is a surface that extends inward as it extends rearward. The barrel-side inclined surface 25 has the function of guiding the claw portion 80 (protrusion 82) inward when attaching the writing instrument component 70 to the front barrel 20.

[0028] Pressing surface 27 is a part of the inner circumferential surface of front barrel 20 and has a generally cylindrical shape. Pressing surface 27 has the function of pressing claw portion 80 (protruding portion 82) inward after writing instrument component 70 is attached to front barrel 20.

[0029] Locked portion 29 is a portion at which a locking portion 74 of writing instrument component 70, described below, locks when writing instrument component 70 is attached to front barrel 20. Locked portion 29 may be, for example, a convex or concave portion formed on the inner circumferential surface of front barrel 20. In this embodiment, locked portion 29 is an annular convex portion formed on the inner circumferential surface of front barrel 20 and extending circumferentially.

[0030] The ink reservoir 11 is a member that stores ink for forming handwriting. The ink reservoir 11 has a substantially cylindrical shape. The ink reservoir 11 is disposed within a barrel 15. The central axis of the ink reservoir 11 coincides with the central axis A of the writing instrument 10. The ink reservoir 11 may be, for example, a member having continuous pores that can be impregnated with and store ink. Such an ink reservoir 11 may be, for example, a heat-fused fiber bundle, a resin-processed fiber bundle, a resin-processed felt, a needle-punched felt, a porous body such as a sponge, or the like. The ink reservoir 11 may also have an outer casing formed of a synthetic resin film or the like on its outer circumferential surface.

[0031] The tip member (first tip member) 50 is a member that forms handwriting on a writing surface such as paper. The tip member 50 is made of a material that allows ink to flow through it in the axial direction da. For example, the tip member 50 may be made of a porous material with open cells. Alternatively, the tip member 50 may be made of a fiber bundle, a bristle bundle, felt, a resin with capillary passages extending in the axial direction da, or the like.

[0032] The tip member 50 has a writing portion 52, an intermediate portion 54, and a rear end portion 56. The writing portion 52 is the portion that forms handwriting on the writing surface. At least a portion of the front of the writing portion 52 protrudes forward from the writing instrument component 70. The writing portion 52 may have, for example, a chisel shape. However, the writing portion 52 is not limited to this, and may have other shapes such as a bullet shape, a rectangular shape, a square prism shape, or a plate shape. The writing portion 52 may have flexibility that allows it to bend and deform in a direction perpendicular to the longitudinal direction in a cross section (the horizontal direction, the left-right direction in Figure 3) due to writing pressure.

[0033] The intermediate portion 54 is located rearward of the writing portion 52 and has a generally cylindrical shape. At least a portion of the intermediate portion 54 contacts an inner rib 71 (described below) of the writing instrument component 70. The rear end portion 56 is located rearward of the intermediate portion 54. The rear end portion 56 has a shape whose cross-sectional area decreases toward the rear. The rear end portion 56 may have, for example, a conical shape, a pyramidal shape, a truncated conical shape, a truncated pyramidal shape, or the like. In this embodiment, the rear end portion 56 has a truncated conical shape whose cross-sectional area decreases toward the rear. The rear end portion 56 is inserted into the ink reservoir 11 from the front of the ink reservoir 11. Ink can flow from the ink reservoir 11 through the rear end portion 56 and the intermediate portion 54 toward the writing portion 52.

[0034] Writing instrument 10 may further include second tip member 12 and rear cap 13. Second tip member 12 may be configured to be able to produce handwriting that is different from handwriting produced by writing portion 52 of tip member 50. The rear end of second tip member 12 protrudes rearward from the rear end of rear barrel 40 and constitutes the writing portion that produces handwriting. The front end of second tip member 12 is inserted into ink reservoir 11 from the rear of ink reservoir 11. Ink can flow from ink reservoir 11 through second tip member 12 toward the rear end of second tip member 12. Rear cap 13 is removably attached to the rear end of rear barrel 40. Rear cap 13 covers second tip member 12 to prevent the ink in second tip member 12 from drying out.

[0035] In this embodiment, the writing instrument component 70 is a component that holds the tip component 50. Therefore, in this specification, the writing instrument component 70 is also referred to as the "holding component 70." That is, in this specification, the "writing instrument component 70" and the "holding component 70" can be interpreted interchangeably. The holding component 70 is attached to the front end of the barrel 15. In particular, in the example shown in FIGS. 1 and 2, the holding component 70 is attached to the front end of the front barrel 20. The holding component 70 has a generally cylindrical shape. The central axis of the holding component 70 coincides with the central axis A of the writing instrument 10. The holding component 70 is formed, for example, by injection molding of a synthetic resin. Examples of synthetic resins that form the holding component 70 include polypropylene, polycarbonate, polyethylene, polyacetal, polyethylene terephthalate, elastomer, and acrylonitrile-butadiene-styrene (ABS) resin. The holding component 70 has a plurality of inner ribs (ribs) 71 and a plurality of claws 80. The retaining member 70 may also include an outer rib 72 , a locking portion 74 , a flange portion 75 , a ventilation groove 77 , and a support portion 78 .

[0036] The inner rib 71 has the function of contacting the middle portion 54 of the tip member 50 when the tip member 50 is inserted into the holding member 70, thereby temporarily fixing the tip member 50 to the holding member 70. The inner rib 71 is formed to protrude radially inward from the inner peripheral surface of the holding member 70. As shown in FIG. 5 , each inner rib 71 extends linearly along the axial direction da. The multiple inner ribs 71 may be arranged at equal angular intervals in the circumferential direction. In this embodiment, the holding member 70 has four inner ribs 71. The four inner ribs 71 are arranged at angular intervals of 90 degrees from each other. However, the number of inner ribs 71 is not limited to this, and the holding member 70 may have two, three, five or more inner ribs 71.

[0037] The diameter of a circle inscribed in the inner ends of the multiple inner ribs 71 is smaller than the diameter of the intermediate portion 54. In this embodiment, the distance between the inner ends of two inner ribs 71 facing each other across the central axis A is smaller than the diameter of the intermediate portion 54. In this embodiment, when attaching the tip member 50 to the holding member 70, the tip member 50 is inserted into the holding member 70 from the rear. The writing part 52 passes through the area of ​​the holding member 70 where the inner ribs 71 are formed and protrudes forward. Then, the intermediate portion 54 of the tip member 50 is pressed into the area of ​​the holding member 70 where the inner ribs 71 are formed. As a result, the outer peripheral surface of the tip member 50 (intermediate portion 54) is pressed against the inner ribs 71 and deforms inward. At this time, frictional force is generated between the outer peripheral surface of the tip member 50 (intermediate portion 54) and the inner rib 71. Therefore, movement of the tip member 50 in the axial direction da relative to the holding member 70 is restricted, and the tip member 50 can be temporarily fixed to the holding member 70.

[0038] The outer ribs 72 are formed to protrude radially outward from the outer peripheral surface of the retaining member 70. As shown in FIG. 4 , each outer rib 72 extends linearly along the axial direction da. When the retaining member 70 is attached to the front axle 20, the outer ribs 72 are positioned within the grooves 23 of the front axle 20. This prevents the retaining member 70 from rotating in the circumferential direction relative to the front axle 20. The multiple outer ribs 72 may be arranged at equal angular pitches from each other in the circumferential direction. In this embodiment, the retaining member 70 has two outer ribs 72. The two outer ribs 72 are arranged at an angular pitch of 180 degrees from each other. However, this is not limiting, and the retaining member 70 may have three or more outer ribs 72.

[0039] The locking portion 74 is a portion that locks onto the locked portion 29 of the front axle 20 when the retaining member 70 is attached to the front axle 20. The locking portion 74 may be, for example, a convex portion or a concave portion formed on the outer peripheral surface of the retaining member 70. In the present embodiment, the locking portion 74 is an annular convex portion that is formed on the outer peripheral surface of the retaining member 70 and extends in the circumferential direction. When the retaining member 70 is attached to the front axle 20, the locking portion 74 climbs over the locked portion 29 and locks onto the locked portion 29. This prevents the retaining member 70 from slipping forward from the front axle 20. Note that the locking portion 74 is not limited to an annular convex portion, and may be, for example, an annular concave portion that is formed on the outer peripheral surface of the retaining member 70 and extends in the circumferential direction. In this case, the convex portion of the locked portion 29 fits into the concave portion of the locking portion 74, thereby locking the locking portion 74 to the locked portion 29. Furthermore, locked portion 29 of front body 20 may be, for example, an annular recess formed on the inner peripheral surface of front body 20 and extending in the circumferential direction. In this case, locking portion 74 is locked to locked portion 29 by fitting a protrusion of locking portion 74 into a recess of locked portion 29. Locking portion 74 is located forward of claw portion 80.

[0040] The flange 75 is formed on the outer peripheral surface of the holding member 70. When the holding member 70 is attached to the front body 20, the flange 75 may come into contact with the front end of the front body 20.

[0041] The ventilation groove 77 is a groove formed across the outer peripheral surface of the holding member 70 and the rear surface of the flange 75. The internal space of the barrel 15 communicates with the outside via the ventilation groove 77. When the ink in the ink reservoir 11 decreases as a result of writing with the writing instrument 10, air flows into the internal space of the barrel 15 through the ventilation groove 77. This prevents the pressure in the internal space of the barrel 15 from becoming negative due to a decrease in ink, which would otherwise cause the flow of ink from the ink reservoir 11 to the tip member 50 to become stagnant.

[0042] The support portion 78 is formed to protrude forward from the main body portion of the holding member 70. In this embodiment, the holding member 70 has two support portions 78, and the writing portion 52 of the tip member 50 is disposed between the two support portions 78. The support portion 78 is intended to come into contact with a writing surface, such as a paper surface, when writing with the writing instrument 10. The front end of the support portion 78 is located rearward of the front end of the writing portion 52. In this embodiment, the writing portion 52 is flexible enough to bend and deform in a direction perpendicular to the longitudinal direction of the cross section (lateral direction, left-right direction in FIG. 3 ) due to writing pressure. When writing, the support portion 78 comes into contact with the writing surface, thereby controlling the amount of bending of the writing portion 52 within a predetermined range. This prevents the writing portion 52 from being damaged or broken due to an excessive bending amount. Furthermore, by moving the writing implement 10 while the two support portions 78 are in contact with the writing surface, the writing portion 52 can bend to a certain degree while writing, thereby enabling stable writing.

[0043] The multiple claws 80 have the function of restricting movement of the tip member 50 in the axial direction da relative to the retaining member 70 when the retaining member 70 is attached to the barrel 15 (front axle 20). The claws 80 extend rearward from the main body of the retaining member 70. When the tip member 50 is disposed within the retaining member 70, the claws 80 are disposed radially outward relative to the tip member 50. The rear ends of the claws 80 are configured to be deformable so that they can move radially inward. In particular, the claws 80 may be configured to be elastically deformable radially inward.

[0044] The plurality of claw portions 80 may be arranged at equal angular pitches relative to one another in the circumferential direction. In this embodiment, the retaining member 70 has four claw portions 80. The four claw portions 80 are arranged at angular pitches of 90 degrees relative to one another. This is not limitative, and the retaining member 70 may have two, three, five or more claw portions 80. It is particularly preferable that the retaining member 70 have three or more claw portions 80. The retaining member 70 may have the same number of claw portions 80 as the number of groove portions 23 of the front axle 20.

[0045] The claw portions 80 may have protrusions 82, claw-side inclined surfaces 84, and inner inclined surfaces 86. The protrusions 82 are formed to protrude radially outward from the outer peripheral surfaces of the claw portions 80. As shown in FIG. 4 , one claw portion 80 has one protrusion 82. In this case, the retaining member 70 has the same number of protrusions 82 as the number of claw portions 80. In this embodiment, the retaining member 70 has four protrusions 82. The protrusions 82 are formed at the circumferential centers of the corresponding claw portions 80. Therefore, the four protrusions 82 are arranged at an angular pitch of 90 degrees from one another. Note that two or more protrusions 82 may be provided for one claw portion 80. When the retaining member 70 is attached to the front axle 20, the protrusions 82 are guided by the axle-tube-side inclined surfaces 25 of the front axle 20 and are subjected to a pressing force from the front axle 20 that deforms the claw portions 80 radially inward. The claw portion 80 has the protrusion 82, which reduces the radial thickness of the main body of the claw portion 80. Therefore, the claw portion 80 can be easily deformed radially inward.

[0046] A claw-side inclined surface 84 is provided at the rear end of protrusion 82. Claw-side inclined surface 84 is a surface that extends inward as it extends rearward. Claw-side inclined surface 84 has the function of cooperating with barrel-side inclined surface 25 of front body 20 to smoothly deform claw 80 radially inward. Furthermore, even if misalignment occurs between the central axis of retaining member 70 and the central axis of front body 20 when retaining member 70 is inserted into front body 20 from the front-end opening of front body 20, claw-side inclined surface 84 functions as a guide surface, allowing retaining member 70 to be smoothly inserted into front body 20.

[0047] The inner inclined surface 86 is provided on the inner surface of the claw portion 80. When the retaining member 70 is not attached to the barrel 15, the inner inclined surface 86 extends outward as it moves rearward (see FIG. 6A). When the retaining member 70 is attached to the front axle 20 and the claw portion 80 is deformed inward, the inner inclined surface 86 becomes approximately parallel to the outer peripheral surface of the tip member 50 (intermediate portion 54). This increases the contact area between the claw portion 80 and the tip member 50, making it possible to more appropriately restrict movement of the tip member 50 in the axial direction da relative to the retaining member 70.

[0048] Next, the process of attaching the tip member and the retaining member to the barrel will be described with reference to Figures 6A to 9D. Figures 6A to 9D are diagrams for explaining an example of the process of attaching tip member 50 and retaining member 70 to barrel 15 (front barrel 20).

[0049] FIG. 6A is a diagram showing the tip member 50, the retaining member 70, and the front axle 20 before the retaining member 70 is attached to the front axle 20, and is a longitudinal cross-sectional view corresponding to line AA in FIG. 3. FIG. 6B is a longitudinal cross-sectional view corresponding to line BB in FIG. 3 at the same time as FIG. 6A. In this embodiment, the inner rib 71 and the claw portion 80 of the retaining member 70 are disposed at a 45-degree angle around the central axis A. In the longitudinal cross-sectional view corresponding to line AA in FIG. 3, the cross section of the claw portion 80 appears, but the cross section of the inner rib 71 does not appear. In addition, in the longitudinal cross-sectional view corresponding to line BB in FIG. 3, the cross section of the inner rib 71 appears, but the cross section of the claw portion 80 does not appear.

[0050] First, the tip member 50 is attached to the holding member 70. In this embodiment, the tip member 50 is inserted into the holding member 70 from the rear. The holding member 70 has an inner inclined surface 86 provided on the inner surface of the claw portion 80. As shown in FIG. 6A , when the holding member 70 is not attached to the barrel tube 15 (front axle 20), the inner inclined surface 86 extends outward toward the rear. In other words, the inner inclined surface 86 extends inward toward the front. Therefore, the tip member 50 that comes into contact with the inner inclined surface 86 and moves forward relative to the holding member 70 is guided by the inner inclined surface 86 and approaches the central axis A. In other words, the inner inclined surface 86 also functions as a guide surface when the tip member 50 is inserted into the holding member 70.

[0051] After the tip member 50 is inserted into the holding member 70, the writing portion 52 of the tip member 50 passes through the region of the holding member 70 where the inner rib 71 is formed and protrudes forward. Then, the middle portion 54 of the tip member 50 is pressed into the region of the holding member 70 where the inner rib 71 is formed. As a result, the outer peripheral surface of the tip member 50 (middle portion 54) is pressed against the inner rib 71 and deformed inward. At this time, a frictional force is generated between the outer peripheral surface of the tip member 50 (middle portion 54) and the inner rib 71. As a result, the tip member 50 is temporarily fixed to the holding member 70. In this state, even if the holding member 70 is held with the writing portion 52 facing upward, for example, the tip member 50 is fixed to the holding member 70 with a force that is strong enough to prevent the tip member 50 from falling out of the holding member 70 due to gravity.

[0052] Fig. 7A is a diagram showing tip member 50, retaining member 70, and front axle 20 when retaining member 70 has been inserted into front axle 20 from the front of front axle 20 and protrusion 82 of retaining member 70 has come into contact with barrel-side inclined surface 25 of front axle 20, and is a longitudinal cross-sectional view corresponding to line AA in Fig. 3. Fig. 7B is an enlarged view of the portion marked 7B in Fig. 7A. Fig. 7C is a longitudinal cross-sectional view corresponding to line BB in Fig. 3 at the same time as Fig. 7A. Fig. 7D is an enlarged view of the portion marked 7D in Fig. 7C.

[0053] Retaining member 70, to which tip member 50 is attached, is inserted into front axle 20 from the front. Retaining member 70 is inserted into front axle 20 so that protrusion 82 of claw portion 80 enters groove 23 of front axle 20. While protrusion 82 is positioned within groove 23, claw portion 80 does not deform in the radial direction. Thereafter, as shown in Figures 7A and 7B, protrusion 82 of claw portion 80 comes into contact with barrel-side inclined surface 25 of groove 23.

[0054] Figure 8A is a diagram showing tip member 50, retaining member 70, and front axle 20 when retaining member 70 has moved further rearward relative to front axle 20 and protruding portion 82 of claw portion 80 is pressed against pressing surface 27 of front axle 20, and is a longitudinal cross-sectional view corresponding to line AA in Figure 3. Figure 8B is an enlarged view of the portion labeled 8B in Figure 8A. Figure 8C is a longitudinal cross-sectional view corresponding to line BB in Figure 3 at the same time as Figure 8A. Figure 8D is an enlarged view of the portion labeled 8D in Figure 8C.

[0055] When the retaining member 70 is further moved rearward relative to the front axle 20, the protruding portion 82 of the claw portion 80 is guided by the barrel-side inclined surface 25 of the groove portion 23 and moves radially inward. At this time, the claw portion 80 deforms radially inward (see FIGS. 8A and 8B). This causes the claw portion 80 to contact the tip member 50. When the retaining member 70 is further moved rearward relative to the front axle 20, the protruding portion 82 is pressed radially inward by the pressing surface 27 located rearward of the barrel-side inclined surface 25. This causes the claw portion 80 to grip the tip member 50 with a relatively large force, restricting movement of the tip member 50 in the axial direction da relative to the retaining member 70. Note that at this time, the inner inclined surface 86 of the claw portion 80 becomes approximately parallel to the outer peripheral surface of the tip member 50 (intermediate portion 54). This increases the contact area between the claws 80 and the tip member 50, and reduces the radial deformation of the tip member 50 even when the claws 80 grip the tip member 50 with a relatively large force. Therefore, the flow of ink inside the tip member 50 is not impeded.

[0056] At this point, the locking portion 74 of the holding member 70 is located forward of the locked portion 29 of the front axle 20, and the locking portion 74 is not locked to the locked portion 29 (see FIGS. 8C and 8D).

[0057] Figure 9A is a diagram showing tip member 50, retaining member 70, and front axle 20 when retaining member 70 has moved further rearward relative to front axle 20 and protruding portion 82 of claw portion 80 is pressed against pressing surface 27 of front axle 20, and is a longitudinal cross-sectional view corresponding to line AA in Figure 3. Figure 9B is an enlarged view of the portion labeled 9B in Figure 9A. Figure 9C is a longitudinal cross-sectional view corresponding to line BB in Figure 3 at the same time as Figure 9A. Figure 9D is an enlarged view of the portion labeled 9D in Figure 9C.

[0058] When retaining member 70 is moved further rearward relative to front axle 20, locking portion 74 of retaining member 70 locks onto locked portion 29 of front axle 20, and retaining member 70 is fixed to front axle 20 (see FIGS. 9C and 9D). In this embodiment, locking portion 74 is an annular convex portion formed on the outer circumferential surface of retaining member 70 and extending in the circumferential direction, and locked portion 29 is an annular convex portion formed on the inner circumferential surface of front axle 20 and extending in the circumferential direction. In this case, the convex portion of locking portion 74 rides over the convex portion of locked portion 29, thereby locking portion 74 to locked portion 29. When the convex portion of locking portion 74 rides over the convex portion of locked portion 29, a relatively large vibration is momentarily generated in retaining member 70. In this embodiment, after the claw portion 80 restricts movement of the tip member 50 in the axial direction da relative to the holding member 70, the locking portion 74 locks with the locked portion 29. Therefore, even if a relatively large vibration occurs in the holding member 70, movement of the tip member 50 relative to the holding member 70 is suppressed.

[0059] Next, the tangle prevention part 90 of the writing instrument part (holding member) 70 will be described with reference to Figures 10 to 15. In the following description and the drawings used in the following description, parts that can be configured similarly to the above-described embodiment will be designated by the same reference numerals as those used for the corresponding parts in the above-described embodiment, and duplicated description will be omitted.

[0060] The writing instrument component 70 of this embodiment has an entanglement prevention portion 90 that prevents the claw portion 80 of the writing instrument component 70 from entangling with other writing instrument components 70.

[0061] Fig. 10 is a diagram for explaining an example of the tangle preventive portion 90, and is a perspective view showing the writing instrument component 70. Fig. 11 is a side view showing the writing instrument component 70. Fig. 12 is a view showing the claw portion 80 of the writing instrument component 70 as viewed from the tip portion 88 side. Fig. 13 is a half-split perspective view showing the writing instrument component 70. Fig. 14 is a vertical cross-sectional view showing the writing instrument component 70. Fig. 15 is a cross-sectional view corresponding to line XV-XV in Fig. 11.

[0062] 10 and 11, the writing instrument component 70 includes a main body 73 and a claw 80. The claw 80 extends rearward from the main body 73. In the examples shown in FIGS. 10 to 23, the support 78 is not shown. The writing instrument component 70 may also include an outer rib 72, a locking portion 74, and a ventilation groove 77, as shown in FIG.

[0063] Each claw portion 80 has a base end portion 87, a tip end portion 88, and a side surface 89. The base end portion 87 is a portion of the claw portion 80 that connects to the main body portion 73. The tip end portion 88 is an end portion of the claw portion 80 opposite the base end portion 87. The tip end portion 88 is a free end. The side surface 89 is a surface that connects the outer peripheral surface and the inner peripheral surface of the claw portion 80. The side surface 89 may extend parallel to the axial direction da. One claw portion 80 has two side surfaces 89. The two side surfaces 89 of one claw portion 80 may extend parallel to each other. However, this is not limited to this, and the two side surfaces 89 may extend so as to approach each other as they move radially outward.

[0064] 10 to 15, the writing instrument component 70 includes two tangle prevention portions 90: a first tangle prevention portion 91 and a second tangle prevention portion 92. However, this is not limited thereto, and the writing instrument component 70 may include only one of the first tangle prevention portion 91 and the second tangle prevention portion 92.

[0065] The first entanglement suppression portion 91 includes a bulge portion 94. The bulge portion 94 has the function of reducing the distance between two circumferentially adjacent claw portions 80. The bulge portion 94 protrudes in the circumferential direction from the side surface 89 of the claw portion 80. The specific protruding shape of the bulge portion 94 is not particularly limited. In the example shown in FIGS. 10 to 15 , the bulge portion 94 is provided at the tip portion 88 of the claw portion 80. In the illustrated example, of the four claw portions 80, the bulge portion 94 is provided at two claw portions 80 that face each other across the central axis A. One claw portion 80 has a bulge portion 94 provided at one side surface 89 and a bulge portion 94 provided at the other side surface 89. Therefore, one claw portion 80 has a bulge portion 94 that protrudes to one circumferential side and a bulge portion 94 that protrudes to the other circumferential side. It is preferable that the bulging portion 94 protrudes from only a portion of the side surface 89, rather than from the entire side surface 89. This allows for a reduction in the amount of material used for the bulging portion 94, compared to when the bulging portion 94 is formed on the entire side surface 89. This reduces the environmental impact and also prevents an increase in the cost of forming the bulging portion 94.

[0066] In the examples shown in FIGS. 10 to 15, the minimum distance D between two claw portions 80 adjacent in the circumferential direction is min is smaller than the maximum radial thickness T1 of the claw portion 80. In the example shown in FIG. 12, the minimum distance D between two claw portions 80 adjacent in the circumferential direction is min is the distance between the top of the bulge 94 and the side surface 89 of the claw portion 80 adjacent in the circumferential direction. In particular, in this embodiment, as clearly shown in FIG. 12, the minimum distance D between two claw portions 80 adjacent in the circumferential direction is min is the shortest distance between the radially inner end of the apex of the bulge 94 and the radially inner end of the side surface 89 of the claw 80 that faces the bulge 94 in the circumferential direction. min is smaller than the maximum thickness T1, the claw portions 80 of other writing instrument components 70 are prevented from entering the gap 85 formed between two circumferentially adjacent claw portions 80. Therefore, the claw portions 80 are prevented from becoming entangled with the claw portions 80 of other writing instrument components 70.

[0067] Preferably, the minimum distance D between two circumferentially adjacent claw portions 80 is min is smaller than the minimum radial thickness T2 of the claw portion 80. min is smaller than the minimum thickness T2, the claw portions 80 of other writing instrument components 70 are more effectively prevented from entering the gap 85 formed between two circumferentially adjacent claw portions 80. Therefore, the claw portions 80 are further prevented from becoming entangled with the claw portions 80 of other writing instrument components 70.

[0068] The second entanglement suppression portion 92 includes a thick portion 79. The thick portion 79 is formed in the main body portion 73. The radial thickness T3 of the thick portion 79 is equal to the minimum distance D between two circumferentially adjacent claw portions 80. min In other words, the thick portion 79 is larger than the minimum distance D min 27, when the main body portion 73 of another writing instrument component 70 is caught in the gap 85 between the two claw portions 80, the two writing instrument components 70 may become entangled. Considering this, it is sufficient that the thick portion 79 is provided at least in a portion adjacent to the gap 85 in the axial direction da when the writing instrument component 70 is viewed radially.

[0069] 10 to 15, the inner rib 71 constitutes the thick portion 79. When the writing instrument component 70 is viewed from the radial direction, the inner rib 71 is arranged side by side in the axial direction da with the gap 85 between the two claw portions 80. However, without being limited to this, the thick portion 79 may be formed in an annular shape extending in the circumferential direction.

[0070] The radial thickness T3 of the thick portion 79 is the minimum distance D between two circumferentially adjacent claw portions 80. min The thickness T3 of the thick portion 79 in the radial direction is greater than the minimum distance D min , the gap 85 between the two claw portions 80 is prevented from being penetrated by the main body portion 73 of another writing instrument component 70. Therefore, the claw portion 80 is prevented from becoming entangled with the claw portion 80 of another writing instrument component 70.

[0071] Fig. 16 is a perspective view showing a modified example of the writing instrument component 70. Fig. 17 is a side view showing the writing instrument component 70 of Fig. 16.

[0072] 16 and 17, of the four claw portions 80, two claw portions 80 that face each other across the central axis A are provided with first tangle suppression portions 91. In this modification, the side surfaces 89 are inclined with respect to the axial direction da and the circumferential direction so that the circumferential width of the claw portions 80 increases from the base end portion 87 toward the tip end portion 88. As a result, the width of the claw portions 80 is greatest at the tip end portion 88. In this modification, the side surfaces 89 at the tip end portion 88 form bulging portions 94.

[0073] In the examples shown in Figures 10 to 15 and the examples shown in Figures 16 and 17, the bulge portion 94 is formed at the tip portion 88 of the claw portion 80, which is preferable because it can prevent the claw portion 80 of another writing instrument part 70 from entering the gap 85 between two claw portions 80 extending in the axial direction da in the portion on the tip portion 88 side of the gap 85.

[0074] 18 and 19, of the four claw portions 80, two claw portions 80 that face each other across the central axis A are provided with first tangle suppression portions 91. In this modification, a bulge portion 94 is provided on a side surface 89 of each claw portion 80 in an intermediate portion between a base end portion 87 and a tip end portion 88.

[0075] 9A, when the claw portions 80 elastically deform radially inward, the bulging portions 94 are prevented from coming into contact with other claw portions 80 adjacent thereto in the circumferential direction. Therefore, it is possible to prevent the claw portions 80 from being prevented from elastically deforming inward.

[0076] 20 and 21, a first entanglement suppression portion 91 is provided on each of the four claw portions 80. In this modification, of the four claw portions 80, two claw portions 80 that face each other across the central axis A are provided with bulging portions 94 at tip portions 88 on side surfaces 89 of the claw portions 80. Furthermore, of the four claw portions 80, the other two claw portions 80 that face each other across the central axis A are provided with bulging portions 94 at intermediate portions between the base ends 87 and the tip portions 88 on the side surfaces 89 of the claw portions 80.

[0077] In this modified example, the bulging portion 94 provided at the tip end 88 of the claw portion 80 can prevent the claw portion 80 of another writing instrument component 70 from entering the gap 85 between the two claw portions 80 at the tip end 88 side of the gap 85. Furthermore, the bulging portion 94 provided at the middle portion of the claw portion 80 can also prevent the claw portion 80 of another writing instrument component 70 from entering the gap 85 at the middle portion of the gap 85 between the two claw portions 80. Therefore, it is possible to more effectively prevent the claw portion 80 of another writing instrument component 70 from entering the gap 85 between the two claw portions 80. Furthermore, since the positions of the bulging portions 94 of two circumferentially adjacent claw portions 80 are shifted in the axial direction da, contact between two circumferentially adjacent bulging portions 94 is prevented when the claw portions 80 elastically deform radially inward.

[0078] In the example shown in Fig. 22 and Fig. 23, the four claws 80 are each provided with a first entanglement suppression portion 91. In this modification, the four claws 80 are each provided with a bulge portion 94 at the tip end 88 of the side surface 89 of the claw 80. In this modification, the minimum distance D between two claws 80 adjacent in the circumferential direction is min Therefore, it is possible to more effectively prevent the claw portion 80 of another writing implement component 70 from entering the gap 85 between the two claw portions 80.

[0079] In the modified examples described with reference to FIGS. 16 to 23, similarly to the embodiment described with reference to FIGS. 10 to 15, the minimum distance D between two claw portions 80 adjacent in the circumferential direction is minis preferably smaller than the maximum radial thickness T1 of the claw portion 80. In addition, the minimum distance D between two claw portions 80 adjacent in the circumferential direction is min is more preferably smaller than the minimum radial thickness T2 of the claw portion 80.

[0080] 16 to 23, the writing instrument component 70 may have a thick portion 79, similar to the embodiment described with reference to Figures 10 to 15. In this case, the specific configuration and effects thereof are the same as those of the embodiment described with reference to Figures 10 to 15, and therefore detailed description thereof will be omitted.

[0081] In the present embodiment and its modified examples, the writing instrument component 70 is a holding member 70 that holds the tip component 50. However, the writing instrument component 70 is not limited to the holding member 70. The writing instrument component 70 may be another component having a main body 73 and a plurality of claws 80. Such a writing instrument component 70 may be, for example, a scraping member for erasing handwriting, a tail plug of a ballpoint pen refill, a tail plug or tail cap attached to the rear end opening of a barrel or the rear end opening of an ink reservoir, an ink occluder support member that supports the front or rear end of an ink occluder, a crown attached to the closed end of a cap, a barrel or front barrel that has a nib at its front end and contains ink, or a cap or inner cap that is detachably attached to the nib side of the barrel.

[0082] The writing instrument part 70 of this embodiment comprises a main body portion 73, a plurality of claw portions 80 extending from the main body portion 73 in the axial direction da and arranged circumferentially, and an entanglement prevention portion 90 that prevents the claw portions 80 from becoming entangled with other parts.

[0083] According to such a writing instrument part 70, by virtue of having the tangle prevention portion 90, it is possible to prevent two writing instrument parts 70 having the claw portion 80 from tangling with each other.

[0084] In the writing implement component 70 of this embodiment, the tangle suppressing portion 90 has a minimum distance D between two circumferentially adjacent claw portions 80. min is smaller than the maximum radial thickness T1 of the claw portion 80.

[0085] Such a writing instrument component 70 prevents the claw portions 80 of other writing instrument components 70 from entering the gap 85 formed between two circumferentially adjacent claw portions 80. Therefore, the claw portions 80 are prevented from becoming entangled with the claw portions 80 of other writing instrument components 70.

[0086] In the writing implement component 70 of this embodiment, the tangle suppressing portion 90 has a minimum distance D between two circumferentially adjacent claw portions 80. min is smaller than the minimum radial thickness T2 of the claw portion 80.

[0087] Such a writing instrument component 70 more effectively prevents the claw portions 80 of other writing instrument components 70 from entering the gap 85 formed between two circumferentially adjacent claw portions 80. Therefore, the claw portions 80 are further prevented from becoming entangled with the claw portions 80 of other writing instrument components 70.

[0088] In the writing implement component 70 of this embodiment, the tangle preventive portion 90 has a bulging portion 94 that reduces the distance between two claw portions 80 that are adjacent in the circumferential direction.

[0089] According to this writing instrument component 70, the tangle-preventing portion 90 can be formed integrally with the claw portion 80. Therefore, the tangle-preventing portion 90 can be formed with a simple configuration. This makes it possible to prevent the claw portion 80 from tangling with the claw portion 80 of another writing instrument component 70 with a simple configuration.

[0090] In the writing implement component 70 of this embodiment, the tangle suppression portion 90 has a thick portion 79 formed on the main body portion 73, and the radial thickness T3 of the thick portion 79 is the minimum distance D between two circumferentially adjacent claw portions 80. min is greater than.

[0091] According to the writing implement component 70, the radial thickness T3 of the thick portion 79 is smaller than the minimum distance D between two circumferentially adjacent claw portions 80. min , the gap 85 formed between the two claw portions 80 is prevented from being penetrated by the main body 73 of another writing instrument component 70. Therefore, the claw portion 80 is prevented from becoming entangled with the claw portion 80 of another writing instrument component 70.

[0092] In the writing instrument part 70 of this embodiment, the thick portion 79 includes a plurality of ribs (inner ribs) 71 that protrude inward from the main body portion 73 and extend in the axial direction da, and when viewed radially, the ribs 71 are arranged in line with the gap 85 formed between two adjacent claw portions 80 in the axial direction da.

[0093] According to this writing instrument component 70, by forming only the rib 71 thick, it is possible to prevent an increase in the amount of material used in the tangle-preventing portion 90 while forming the thick portion 79. This reduces the environmental impact and also prevents an increase in the cost of forming the tangle-preventing portion 90.

[0094] The writing instrument 10 of this embodiment comprises a barrel 15, a tip member 50 having a writing portion 52 for forming handwriting, and a writing instrument part 70 described in any one of claims 1 to 7 attached to the barrel 15 so that multiple claw portions 80 are positioned outside the tip member 50, and the writing instrument part 70 holds the tip member 50 when attached to the barrel 15.

[0095] According to such a writing instrument 10, in the writing instrument component (holding component) 70 for holding the tip component 50, the claw portion 80 can be prevented from becoming entangled with the claw portion 80 of another writing instrument component 70.

[0096] In the writing instrument component 70 of this embodiment, the writing instrument component 70 is a component that is attached to the barrel 15 of the writing instrument, and when attached to the barrel 15, the claw portions 80 are deformed inward.

[0097] In the writing instrument 10 of this embodiment, when the writing instrument part 70 is attached to the barrel 15, the claw portion 80 deforms inward and contacts the tip member 50, thereby restricting the movement of the tip member 50 in the axial direction da relative to the writing instrument part 70.

[0098] If the claw portions 80 are radially deformable, when the claw portions 80 or the main body portion 73 of one holding member 70 enters a gap 85 of another holding member 70, the claw portions 80 of the other holding member 70 are elastically deformed, and the force of the claw portions 80 attempting to return to their original shape presses down on the claw portions 80 or the main body portion 73 located within the gap 85. In this case, the claw portions 80 are particularly likely to become entangled with the claw portions 80 or the main body portion 73 of the other writing instrument component 70.

[0099] According to the writing instrument part 70 and writing instrument 10 of this embodiment, it is possible to prevent the claw portion 80 from becoming entangled with the claw portion 80 of another writing instrument part 70, particularly when the claw portion 80 is capable of radially deforming and is prone to becoming entangled with the claw portion 80 or main body portion 73 of another writing instrument part 70. [Explanation of symbols]

[0100] 10 Writing instruments 11 Ink reservoir 12 second tip member 13 Rear cap 15 Shaft tube 20 front axle 21 Tsuba 23 Groove 25 Shaft cylinder side inclined surface 27 Pressing surface 29 Locked part 40 rear axle 50 chip member (first chip member) 52 Writing section 54 Middle section 56 Rear end 70 Retaining member 71 Rib (inner rib) 72 outer rib 73 Main body 74 Locking part 75 Tsuba 77 Ventilation groove 78 Support part 79 Thick part 80 Claw 82 Protrusion 84 Claw side inclined surface 85 Gap 86 Inner slope 87 Proximal end 88 Tip 89 Side 90 Tangle prevention unit 91 First entanglement prevention section 92 Second tangle prevention section 94 Bulge A Center axis da axial direction

Claims

1. a main body; a plurality of claws extending from the main body in the axial direction and arranged in the circumferential direction; and an entanglement prevention portion that prevents the claw portion from entangling with other components.

2. The writing implement component according to claim 1 , wherein in the tangle-preventing portion, a minimum distance between two circumferentially adjacent claw portions is smaller than a maximum radial thickness of the claw portions.

3. The writing implement component according to claim 1 , wherein in the tangle-preventing portion, a minimum distance between two circumferentially adjacent claw portions is smaller than a minimum radial thickness of the claw portions.

4. The writing implement component according to claim 1 , wherein the tangle-preventing portion has a bulge that reduces the distance between two of the claw portions that are adjacent in the circumferential direction.

5. The tangle suppression portion has a thick portion formed on the main body portion, 2. The writing implement component according to claim 1, wherein the radial thickness of the thick portion is greater than the minimum distance between two of the claw portions adjacent in the circumferential direction.

6. the thick portion includes a plurality of ribs that protrude inward of the main body portion and extend in the axial direction; The writing implement component according to claim 5 , wherein, when viewed from the radial direction, the rib is arranged so as to be aligned in the axial direction with a gap formed between two adjacent ones of the claw portions.

7. The writing instrument component is a component to be attached to a barrel of a writing instrument, 2. The writing implement component according to claim 1, wherein the claws are deformed inward when attached to the barrel.

8. A shaft cylinder and a tip member having a writing portion for forming handwriting; The writing instrument component according to any one of claims 1 to 7, wherein the plurality of claws are attached to the barrel so as to be positioned outside the tip member; The writing implement component holds the tip member when attached to the barrel.

9. 9. The writing instrument according to claim 8, wherein when the writing instrument part is attached to the barrel, the claw portion deforms inward and contacts the tip member, thereby restricting axial movement of the tip member relative to the writing instrument part.

Images