JP6045270B2 - Ballpoint pen with refill - Google Patents

Description

  The present invention relates to a refill for containing ink and a ballpoint pen containing a refill in a shaft tube.

  Conventionally, various types of ballpoint pens in which a tubular refill is accommodated in a shaft cylinder have been provided. The refill contains ink inside. Therefore, since ink in the ink decreases with writing, it is necessary to introduce air into the ink. Therefore, this refill needs to have a structure opened to the outside by some means except in the case of a so-called pressurized ballpoint pen in which a pressurized gas is sealed.

  For example, when using ink with low ink viscosity and high fluidity, the rear end of the refill is closed and an air hole is provided on the front side, and the air hole and the inside of the refill are connected to the outside. The air is circulated through a so-called collector that buffers the pressure difference. On the other hand, when using inks with relatively high viscosity and low fluidity, such as oil-based inks or so-called gel inks, leave them open without any plugs attached to the rear end of the refill. Has been done.

  Further, when such refill is accommodated in the shaft tube, if it moves inside, the writing tip will be shaken to adversely affect the writing, so it needs to be fixed inside the shaft tube. As the fixing method, there are a method of fixing on the front end side of the refill and a method of fixing on the rear end side of the refill.

  As a method of fixing to the shaft cylinder on the tip end side of the refill, for example, when a flange is provided near the tip of the refill and the base is screwed to the tip of the shaft cylinder, the flange is connected with the tip of the shaft cylinder and the base. It is done to be pinched. On the other hand, as a method of fixing to the shaft cylinder on the rear end side of the refill, a rear end portion of the refill is brought into contact with an inner wall near the rear end portion of the shaft cylinder.

  For example, in the invention described in Patent Document 1, an elastic deformation portion that abuts against the inner wall of the rear shaft is provided at the rear end portion of the refill. However, since this elastically deforming portion is an annular projection and has a uniform thickness, in the case of a type in which an air hole is formed at the rear end portion of the refill, the entire circumference of the annular projection abuts on the rear shaft. For this reason, air cannot be sufficiently supplied to the rear end portion of the refill, and there is a risk that writing defects such as blurring may occur.

  In order to solve the above problem, Patent Document 2 discloses an invention of a different type of elastically deformable portion. That is, the elastically deforming portion is constituted by a plurality of independent protruding pieces that can be elastically deformed in the radial direction, thereby allowing air to flow from the gap between the protruding pieces. Further, when the refill is inserted into the shaft tube, the elastically deforming portion is pressed against the inner wall of the shaft tube, thereby elastically deforming radially inward. By the restoring force against the elastic deformation, the rear end portion of the refill presses the inner wall of the shaft cylinder, so that the refill is fixed. Furthermore, this elastic deformation can also absorb the dimensional variation in the axial direction that occurs during refill manufacturing.

  However, since this elastic deformation occurs independently for each projecting piece, the load applied to each projecting piece becomes larger as a result compared to the case where the elastically deforming portions are integrated. Therefore, when this load is applied for a long period of time, each projecting piece may be elastically fatigued, and may be insufficiently fixed to the shaft cylinder by the restoring force and may not sufficiently absorb the dimensional variation in the axial direction. .

  In order to solve the above problem, Patent Document 3 discloses another invention of an elastic deformation portion of a different type. That is, the elastically deforming portion is provided in a refill plug that is attached to the rear end portion of the refill and has an air hole along the central axis thereof, and connects the plurality of thick portions to the thick portion and is thick. And a thin portion that is thinner than the meat portion, and is configured to come into contact with the inner wall near the rear end portion of the shaft tube. Air can be circulated from the air hole and the gap between the thick wall portions provided along the central axis. Further, when the refill is inserted into the shaft tube, the elastically deforming portion is pressed against the inner wall of the shaft tube, thereby elastically deforming radially inward. By the restoring force against the elastic deformation, the rear end portion of the refill presses the inner wall of the shaft cylinder, so that the refill is fixed. Furthermore, this elastic deformation can also absorb the dimensional variation in the axial direction that occurs during refill manufacturing. Furthermore, the occurrence of elastic fatigue as described in Patent Document 2 can be suppressed by having the thin-walled portion that connects the thick-walled portions.

Japanese Utility Model Publication No. 61-42851 JP 2002-283784 A JP 2005-74922 A

  However, in the elastic deformation portion described in Patent Document 3, the shape of the air hole provided along the central axis changes due to the elastic deformation in the radial direction when the refill is inserted into the shaft tube. As a result, particularly when the axial dimension of the refill is slightly larger than the specified dimension, the elastic deformation in the radial direction becomes larger, and there is a possibility that a sufficient air flow path between the inside and outside of the refill cannot be secured. There is.

  In one aspect, the present invention provides a refill that secures an air flow path between the inside and the outside of the refill and a ballpoint pen including the refill.

According to the invention of claim 1, comprising a shaft tube, a tip portion, a rear end portion, a writing portion provided at the tip portion, and a refill plug attached to the rear end portion , a refill tube housed in the shaft in the cylinder, comprising an air flow passage communicating between the inside and outside of the refill, the refill plug, said the refill when the housing to the shaft cylinder abuts against the rear end inner wall of the shaft tube, the vent opening leading from the outside of the refill to the air flow passage is provided on the side surface of the front Symbol refill plug, the central axis direction in the side portion of the refill plug A groove is provided, and when the refill plug is mounted, the air flow passage is formed by the ventilation groove and the inner wall of the rear end portion, and the refill plug has a plurality of thick portions that are thick in the radial direction, A thin-walled portion connected between the thick-walled portions in the circumferential direction and thinner in the radial direction than the thick-walled portion An elastic deformation portion provided with, characterized in that when inserting the refill into the shaft within the cylinder, comprising a, a refill is configured such that the elastic deformation portion is pressed against the barrel inner wall A ballpoint pen is provided.

Further, in the invention described in claim 1 According to the invention described in claim 2, ball-point pen in which the air flow passage, characterized in that it is coordinating several such radially with respect to the central axis of the refill is provided The

  According to the invention described in each claim, by providing an external opening continuing into the air flow passage communicating between the inside and the outside of the refill on the side surface portion of the rear end portion or the side surface portion of the refill plug, Regardless of the deformation of the rear end portion of the refill plug, the air flow between the inside and the outside of the refill can be ensured. That is, according to the invention described in each claim, there is a common effect of securing an air flow passage between the inside and the outside of the refill.

It is a longitudinal cross-sectional view which shows the ball-point pen provided with the refill by 1 aspect of this invention. It is another longitudinal cross-sectional view of the ball-point pen shown by FIG. It is a perspective view of the refill stopper used for the refill by 1st Embodiment of this invention. FIG. 4 is another perspective view of the refill stopper shown in FIG. 3. FIG. 4 is a plan view of the refill stopper shown in FIG. 3. FIG. 6 is a longitudinal sectional view of the refill plug shown in FIG. 3 taken along line AA in FIG. 5. FIG. 2 is an enlarged vertical sectional view in which a rear end portion of the ballpoint pen shown in FIG. 1 is enlarged. It is a perspective view of the refill stopper used for the refill by 2nd Embodiment of this invention. It is a perspective view of the refill stopper used for the refill by 3rd Embodiment of this invention. FIG. 10 is a longitudinal sectional view of the refill plug shown in FIG. 9. It is a perspective view of the refill stopper used for the refill by 4th Embodiment of this invention. FIG. 12 is a plan view of the refill stopper shown in FIG. 11. FIG. 13 is a longitudinal sectional view of the refill plug shown in FIG. 11 taken along line BB in FIG. 12. It is a perspective view of the refill stopper used for the refill by 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the refill stopper shown by FIG. It is a side view of the refill by 5th Embodiment of this invention. It is a longitudinal cross-sectional view in line CC of the refill shown by FIG. It is a perspective view of the refill stopper used for the refill by 6th Embodiment of this invention. FIG. 19 is a side view of the refill stopper shown in FIG. 18.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.

  FIG. 1 is a longitudinal sectional view showing a ballpoint pen 1 having a refill 10 according to an aspect of the present invention, and FIG. 2 is another longitudinal sectional view of the ballpoint pen shown in FIG. The ballpoint pen 1 includes a refill 10, a shaft cylinder 11 that extends in a cylindrical shape, and a cap 12. The shaft cylinder 11 has a cylindrical front shaft 13 and a rear shaft 14 whose front end portion is screwed to the rear end portion of the front shaft 13. The front shaft 13 and the rear shaft 14 are made of a resin material such as polycarbonate resin. At the front end of the front shaft 13, a hole 13 a for projecting a writing tip portion 17 of the refill 10 described later is formed. In the present specification, in the axial direction of the ballpoint pen, the writing tip portion side is defined as the “front” side, and the opposite side of the writing tip portion is defined as the “rear” side. Further, the “center axis” means the center axis of the ballpoint pen or refill.

  The refill 10 includes a cylindrical refill main body 15, a joint member 16, a writing tip portion 17, and a refill plug 30. The refill body 15 is formed of a resin material or a metal material such as polypropylene, and is configured to contain ink. The joint member 16 is made of, for example, a resin material or a metal material such as polypropylene, polybutylene terephthalate, or polyethylene, and its rear end portion is press-fitted into the front end portion of the refill main body 15. Further, the rear end portion of the writing front end portion 17 is mounted in the front end portion of the joint member 16. The refill 10 is accommodated in the shaft cylinder 11, and a part of the writing tip 17 is exposed through the hole 13 a of the front shaft 13 in the state of being accommodated in the shaft cylinder 11. The writing tip portion 17 serving as a writing portion holds a ball at the tip, and ink stored in the refill main body 15 portion is discharged through the joint member 17 in accordance with the rotation of the ball at the time of writing. A refill plug 30 is press-fitted into the rear end portion of the refill main body 15 and is attached by fitting by this press-fitting. The refill plug 30 will be described later.

  The cap 12 includes a clip member 18 and a cap body 19. The clip member 18 includes an annular portion 18a formed in an annular shape and a sandwiching portion 18b formed integrally on the outer surface of the annular portion 18a. The sandwiching portion 18 b is configured to have elasticity so that an article such as a document or clothing can be sandwiched between the cap body 19. Examples of a material for forming the clip member 18 include synthetic resins such as polycarbonate and acrylonitrile / butadiene / styrene. However, in order to prevent breakage when the sandwiching portion 18b is bent, it may be formed using a rubber elastic material such as an elastomer, particularly the same elastic material as that of the cap body described below.

  The cap body 19 is a cylindrical member made of an elastic body whose one end is closed so as to protect the writing tip portion 17 of the ballpoint pen 1, and an attachment hole 19 a is formed on a side surface thereof. An annular portion 18a of the clip member 18 is disposed in the cap body 19, and a holding portion 18b of the clip member 18 is provided so as to extend out of the cap body 19 through the attachment hole 19a. That is, the cap body 19 closes the opening on the front side of the annular portion 18a of the clip member 18 and extends in a cylindrical shape by a predetermined length from the opening on the rear side, and has an opening into which the shaft cylinder 11 containing the refill 10 is inserted. Forming.

  As a material for forming the cap body 19, rubber elastic materials such as rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene elastomer, olefin elastomer and polyester elastomer, The mixture of the rubber elastic material of a seed | species or more and the mixture of a rubber elastic material and a synthetic resin are mentioned.

  3 is a perspective view of the refill plug 30 used in the refill 10 according to the first embodiment of the present invention, FIG. 4 is another perspective view of the refill plug 30 shown in FIG. 3, and FIG. 3 is a plan view of the refill plug 30 shown in FIG. 3, and FIG. 6 is a longitudinal sectional view of the refill plug 30 shown in FIG. 3 taken along line AA in FIG. When the refill plug 30 is attached to the refill body 15, the direction of the writing tip 17 is “front” and the opposite side is “rear”.

  The refill plug 30 includes a contact portion 31 that is exposed from the rear end portion of the refill body 15 and contacts the inner wall of the rear shaft 14, and a press-fit portion 32 that is a portion that is press-fitted into the refill body 15. The front end surface 31 a of the contact portion 31 is configured to contact the rear end surface 15 a of the refill body 15. Further, the contact portion 31 has an elastic deformation portion 33. The elastically deformable portion 33 includes a plurality of thick portions 33a that are thicker in the radial direction, extending toward the rear, and thin portions 33b that are thinner in the radial direction than the thick portion 33a. The thick portion 33a has a substantially fan-shaped cross section perpendicular to the central axis, and is equally distributed at 120 degrees with respect to the central axis. The thin portion 33b connects each of the thick portions 33a in the circumferential direction at a portion near the central axis, and the vertical cross section with respect to the central axis has a substantially arc shape. That is, the thick portions 33a and the thin portions 33b are alternately arranged. A groove-like air circulation groove 33c is formed by each thick part 33a and the thin part 33b between them. Further, a hole 33d, which is a play space for allowing the elastic deformation portion 33 to be elastically deformed, is formed at the rear end of the elastic deformation portion 33 by the thick portion 33a or the thin portion 33b in the vicinity of the central axis. The

  The press-fit portion 32 is formed in a substantially cylindrical shape having a smaller diameter than the contact portion 31. The press-fit portion 32 has a plurality of fitting protrusions 32a formed in the circumferential direction. At the time of press-fitting into the rear end portion of the refill main body 15, the fitting protrusion 32 a is slightly elastically deformed radially inward to realize more reliable fitting with the inner wall of the refill main body 15. Further, the press-fit portion 32 is formed with three ventilation grooves 32c extending rearward from the front end surface 32b in parallel to the central axis on the side surface portion. The ventilation grooves 32c are equally arranged at 120 degrees with respect to the central axis. The cross-sectional shape of the ventilation groove 32c in a plane perpendicular to the central axis is substantially rectangular. That is, the ventilation groove 32c is formed of a bottom surface 32c extending in the central axis direction along the circumferential direction and a side surface 32d extending in the central axis direction along the radial direction. The ventilation groove 32 c extends further beyond the press-fit portion 32, that is, beyond the front end surface 31 a of the contact portion 31. For example, in the case of the refill plug 30 shown in FIG. 3, the refill plug 30 extends rearward from the front end surface 31 a of the contact portion 31 by the same length as the radial depth of the ventilation groove 32 c of the press-fit portion 32.

  When the refill plug 30 is fitted to the rear end portion of the refill main body 15, the ventilation groove 32 c, the rear end inner wall of the refill main body 15 and the rear end surface 15 a of the refill main body 15 cooperate to form the air flow passage 35. . The air flow passage 35 communicates between the inside and the outside of the refill body 15 with the refill plug 30 mounted on the refill body 15. That is, an opening 36 serving as an inlet / outlet of the air flow passage 35 is formed on the front end surface of the refill plug 30 or the side surface of the refill plug 30.

  FIG. 7 is an enlarged longitudinal sectional view in which the rear end portion of the ballpoint pen 1 shown in FIG. 1 is enlarged. As shown in FIG. 7, five protrusions 20 that run in the axial direction are formed on the inner wall of the rear end portion of the rear shaft 14. An inclined surface 20a in the distal direction is formed at the distal end portion of the protrusion 20, and the rear end portion of the refill plug 30 abuts on the inclined surface 20a. That is, when the refill 10 is accommodated in the shaft cylinder 11, the rear end portion of the thick portion 33 a of the elastically deformable portion 33 of the refill plug 30 is pressed against the inclined surface 20 a of the protrusion 20 on the inner wall of the rear end portion of the rear shaft 14. Is done. Thereby, the thick portion 33a is elastically deformed toward the central axis, that is, radially inward. At the same time, the thin portions 33b between the thick portions 33a are also elastically deformed so as to contract in the circumferential direction. Due to these elastic deformations, the thick portion 33a presses and engages the inner wall of the shaft cylinder, and the refill 10 is fixed. Furthermore, these elastic deformations can also absorb axial dimensional variations that occur mainly during the manufacture of the refill 10 due to the refill body 15. Moreover, since the load directly applied to the thick part 33a is supported also by the thin part 33b, the load to the refill plug 30 is distributed to the whole elastic deformation part 33 as a whole. Moreover, generation | occurrence | production of the elastic fatigue of the thick part 33a can also be suppressed by connecting the thin part 33b between the thick parts 33a.

  As described above, the refill plug 30 is preferably made of a softer material than the shaft tube 11, that is, the rear shaft 14, because it is elastically deformed by contacting the inner wall of the rear end portion of the rear shaft 14. For example, when the shaft cylinder 11 is made of polycarbonate or ABS, the refill plug 30 is made of softer polypropylene, polyacetal, thermoplastic elastomer, or the like.

  As described above, the refill 10 according to the present invention has the opening 36 serving as the inlet / outlet of the air flow passage 35 on the side surface of the refill plug 30. Therefore, unlike the invention described in Patent Document 3 in which the air hole is provided in the central axis of the refill plug 30, the air flow passage is not deformed. Therefore, according to the refill 10 according to the present invention, it is possible to sufficiently secure an air flow path between the inside and the outside of the refill 10.

  In the case of the inventions described in Patent Documents 1 to 3, since the refill plug is fitted into the refill main body by press fitting, the fitting portion of the refill main body and the vicinity thereof are radially outward by the elastic force of the refill plug. The power is always applied toward. As a result, the refill main body is cracked, the fitting with the refill stopper becomes insufficient, and the refill stopper may fall off. However, according to the refill 10 of the present invention, the ventilation groove 32 c is provided in the press-fit portion 32 of the refill plug 30. For this reason, the fitting protrusion 32a contracted radially inward by press-fitting expands in the circumferential direction in the portion of the ventilation groove 32c according to the contraction. Thereby, the force acting on the outer side in the radial direction that causes the refill main body to crack is relieved. Therefore, according to the refill 10 of the present invention, it is possible to suppress the occurrence of cracks in the refill body 15 while maintaining a sufficient fitting force between the refill body 15 and the refill plug 30.

  The shape of the thin portion 33b is preferably an arc shape between the thick portions 33a, but is not limited thereto, and a square, a rectangle, an ellipse, or the like can also be employed. Further, the elastic deformation portion 33 can be formed integrally with the refill main body 15. When the elastic deformation portion 33 is formed integrally with the refill main body 15, the air flow passage may be simply a hole provided in the side surface portion. In addition, there is no limitation in particular in the number of the thick parts 33a equally distributed. Further, the shape of the ventilation groove 32c and the number thereof, that is, the number of the air flow passages 35 are also arbitrary.

  FIG. 8 is a perspective view of a refill plug 40 used for refill according to the second embodiment of the present invention. The configuration other than the refill plug 40 is the same as that of the first embodiment. The refill plug 40 shown in FIG. 8 differs from the refill plug 30 used in the refill 10 according to the first embodiment of the present invention shown in FIG. 3 only in the number of ventilation grooves. That is, the refill plug 40 shown in FIG. 8 has four ventilation grooves 42 c that are equally arranged at 90 degrees with respect to the central axis in the press-fit portion 42.

  FIG. 9 is a perspective view of the refill plug 50 used for the refill according to the third embodiment of the present invention, and FIG. 10 is a longitudinal sectional view of the refill plug 50 shown in FIG. The configuration other than the refill plug 50 is the same as that of the first embodiment. The refill plug 50 shown in FIG. 9 includes a contact portion 51 and a press-fit portion 32. The contact portion 51 has an annular elastic deformation portion 53 having a substantially uniform thickness and extending rearward. The press-fit portion 32 and the ventilation groove 32c are the same as in the first embodiment. Therefore, the refill plug 50 shown in FIG. 9 also has an opening of the inlet / outlet of the air flow passage on the side surface thereof. For this reason, unlike the refill stopper described in Patent Document 1, it is possible to ensure a sufficient air flow path between the inside and the outside of the refill despite the deformation due to the contact with the rear shaft of the elastically deformable portion. It becomes possible. In addition, by making the elastic deformation portion thicker than the refill plug 30 used in the first embodiment, it is possible to realize an elastic deformation portion that is more resistant to elastic fatigue.

  11 is a perspective view of a refill plug 60 used for refill according to a fourth embodiment of the present invention, FIG. 12 is a plan view of the refill plug 60 shown in FIG. 11, and FIG. FIG. 13 is a longitudinal sectional view of the refill plug 60 shown in FIG. The configuration other than the refill plug 60 is the same as that of the first embodiment. The refill plug 60 shown in FIG. 11 includes a contact portion 61 and a press-fit portion 62. The contact part 61 has an elastic deformation part 63 having a thick part 63a and a thin part 63b. The refill plug 60 shown in FIG. 11 differs from the first embodiment in the vertical cross-sectional shape of the thick portion 63a with respect to the central axis. That is, the thick portion 63a has a shape in which the circumferential length of the portion near the central axis is longer than the circumferential length of the outer portion.

  In the air flow path 65 of the refill plug 60 shown in FIG. 11, a vertical hole 62 b provided in the press-fit portion 62 along the central axis is provided in the contact portion 61 perpendicular to the central axis. It communicates with the lateral hole 61 b and continues to the outside through an opening 66 provided in the side surface of the refill plug 60. A plurality of the lateral holes 61b may be provided radially in the contact portion 61 from the central axis to the outer side in the radial direction.

  FIG. 14 is a perspective view of a refill plug 80 used in a refill 70 according to a fifth embodiment of the present invention, and FIG. 15 is a longitudinal sectional view of the refill plug 80 shown in FIG. The refill plug 80 shown in FIG. 14 includes a contact portion 81 and a press-fit portion 82.

  In the press-fit portion 82, two ventilation grooves 82c extending rearward from the front end surface 82b in parallel to the central axis are formed in the side surface portion. The ventilation grooves 82c are equally arranged at 180 degrees with respect to the central axis. The cross-sectional shape of the ventilation groove in a plane perpendicular to the central axis is substantially rectangular, like the ventilation groove 32c of the first embodiment. The refill plug 80 used in the fifth embodiment is different from the refill plug 30 used in the first embodiment in that the ventilation groove 82c is provided only in the press-fit portion 82. That is, in the refill plug 80 used in the fifth embodiment, the ventilation groove 82c is not provided in the contact portion 81 portion.

  FIG. 16 is a side view of the refill 70 according to the fifth embodiment of the present invention, and FIG. 17 is a longitudinal sectional view taken along line CC of the refill 70 shown in FIG. At the rear end portion of the refill main body 75 of the refill 70 according to the fifth embodiment, two rectangular cutout portions 75b extending forward from the rear end surface 75a in parallel to the central axis are formed. The notches 75b are equally arranged at 180 degrees with respect to the central axis. When the refill plug 80 is fitted to the rear end portion of the refill main body 75 so that the vent groove 82c of the refill plug 80 and the notch 75b of the refill main body 75 coincide, the rear end portion of the vent groove 82c and the refill main body 75 is obtained. The air flow passage 85 is formed in cooperation with the inner wall. As a result, an opening 86 serving as an inlet / outlet of the air flow passage 85 is formed in the front end surface of the refill plug 80 or the side surface portion of the rear end portion of the refill main body 75.

  The shape and the number of the ventilation grooves 82c, that is, the number of the air flow passages 85 are arbitrary. As a matter of course, the number and arrangement of the cutout portions 75b of the refill body 75 are also determined in accordance with the number and arrangement of the ventilation grooves 82c.

  18 is a perspective view of a refill plug 90 used for refill according to a sixth embodiment of the present invention, and FIG. 19 is a side view of the refill plug 90 shown in FIG. The configuration other than the refill plug 90 is the same as that of the first embodiment. The refill plug 90 shown in FIG. 18 has a plurality of fittings formed in the circumferential direction of the press-fitting portion as compared with the refill plug 30 used in the refill 10 according to the first embodiment of the present invention shown in FIG. Only the shape of the mating protrusion is different. That is, the press-fit portion 92 of the refill plug 90 has a plurality of fitting protrusions 92a formed in the circumferential direction. The fitting protrusions 32a of the refill plug 30 shown in FIG. 3 have the same length (width) in the axial direction, whereas the fitting protrusions of the refill plug 90 shown in FIGS. 92a is formed to have different lengths (widths) in the axial direction.

  In the present embodiment, the fitting protrusion 92a disposed on the front end surface 92b side of the press-fit portion 92 has a longer axial length (width) than the fitting protrusion 92a disposed on the rear side. However, the present invention is not limited to this. The position at which the fitting protrusion 92a having a long axial length (width) is disposed, the number of the fitting protrusions 92a, and the like can be arbitrarily selected. Since the axial length (width) of the fitting protrusion 32a is formed long, the fitting force with the inner wall of the refill main body 15 can be improved when press-fitting into the rear end portion of the refill main body 15. Thus, it is possible to realize more reliable fitting.

  As described above, the present invention has been described using several embodiments. According to the present invention, the refill is fixed when accommodated in the shaft tube, and the axial dimensional variation that occurs during refill manufacturing is absorbed, and There is a common effect that a sufficient air flow path between the inside and outside of the refill can be secured.

DESCRIPTION OF SYMBOLS 1 Ball-point pen 10 Refill 11 Shaft cylinder 12 Cap 30 Refill plug 35 Air flow path 36 Opening part

Claims (2)

A barrel,
A tip end, a rear end, a writing portion provided at the tip, and a refill plug attached to the rear end, a tubular refill accommodated in the shaft cylinder , comprising an air flow passage communicating between the inside and outside of the refill, the refill plug abuts the refill to the rear end inner wall of the shaft tube when accommodated into the shaft cylinder, the outside of the refill from an opening leading to the air flow passage is provided on the side surface of the front Symbol refill plug, said refill ventilation groove is provided in the center axis direction in the side portion of the plug, and the vent grooves during mounting of the refill plug The air flow passage is formed by the inner wall of the rear end portion, and the refill plug is connected to the plurality of thick portions in the radial direction and the thick portions in the circumferential direction and the thick wall portion. An elastically deformable portion having a thin portion that is thinner in the radial direction than the portion, and the refill When inserted into the shaft in the cylinder, and refill the elastic deformation portion is configured to be pressed against the barrel inner wall,
A ballpoint pen comprising: Ballpoint pen according to claim 1, wherein the air flow passage, characterized in that it is coordinating several such radially with respect to the central axis of said refill.

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