JP2015006760A - Core cotton type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit outflow of an ink etc. caused by a core cotton being pressed and improve the workability during assembly and replacement of the core cotton.SOLUTION: A core cotton type writing instrument includes: a barrel 10; a writing body 20 attached to the front end side of the barrel 10 and exposed to the front side; a tail valve 30 attached to a rear end part of the barrel 10 and having a substantially cylindrical shape; and a core cotton 40 which is housed in an area ranging from the barrel 10 to the tail valve 30 and has a long columnar shape. An ink infiltrating in the core cotton 40 is guided to the writing body 20. Core cotton holding protrusions 33 which contact with an outer peripheral surface of the core cotton 40 inserted in an axial direction and hold the core cotton 40 are provided on an inner peripheral surface of the tail valve 30 or the barrel 10. Each core cotton holding protrusion 33 increases a contact area contacting with the outer peripheral surface of the core cotton 40 in a direction that the core cotton 40 is inserted into the trail valve 30 or the barrel 10.

Description

  The present invention relates to a batting type writing instrument such as a sign pen or a marking pen having an inner pad impregnated with ink, and more particularly to a batting type writing instrument suitable as a structure capable of exchanging batting.

Conventionally, in this kind of invention, for example, as described in Patent Document 1, a shaft cylinder (1) and a cursive body (pen body 3) attached to the front end side of the shaft cylinder (1) and exposed forward. 4), a substantially cylindrical tail plug (rear shaft cylinder 20) attached to the rear end of the shaft cylinder (1), and a length accommodated from the inside of the shaft cylinder (1) to the inside of the tail plug (20). There is a measure column-shaped batting (2), in which the ink impregnated in the batting (2) is guided to the writing body (3, 4).
According to this prior art, in the shaft cylinder (1), a plurality of thin rib-shaped batting engagement protrusions (10a, 20a) which are fitted to the outer peripheral surface of the batting (2) are provided. The fitting protrusions (10a, 20a) are brought into pressure contact with the end side of the batting (2).

However, in the above-described prior art, each of the thin rib-shaped batting engagement protrusions (10a, 20a) extending with substantially the same thickness in the axial direction of the shaft is locally provided on the end side of the batting (2). Because it is in pressure contact, when it receives a drop impact, vibration, etc., the batting is excessively pressed and the ink inside the batting flows out and adheres to the outer surface of the batting, or the tail plug There is a risk of accumulating at the bottom of the inside.
Further, when inserting the batting (2) into the shaft tube (1) or tail plug (rear shaft tube 20) for the purpose of assembling or replacing the batting, the end side of the batting (2) is suddenly and locally. Since the ink is compressed, this may cause the ink in the batting (2) to flow out, and the assembling workability of the batting (2) to be lowered.

Japanese Patent No. 4522559

  The present invention has been made in view of the above-mentioned conventional circumstances, and the problem to be solved is to suppress the outflow of ink due to the pressing of the batting and improve the workability when assembling the batting or replacing the batting. The object is to provide a batting type writing instrument that can be used.

  One means for solving the above problems is a shaft tube, a writing body mounted on the front end side of the shaft tube and exposed forward, and a substantially cylindrical tail plug mounted on a rear end portion of the shaft tube. And a batting type writing instrument comprising a long columnar batting accommodated from the inside of the shaft cylinder to the inside of the tail plug, wherein the ink impregnated in the batting is guided to the writing body, the tail plug or the The inner peripheral surface of the shaft cylinder is provided with a batting holding projection that contacts the outer circumferential surface of the batting inserted in the axial direction and holds the batting, and the batting holding projection is in contact with the outer circumferential surface of the batting. The area is increased in a direction in which filling is inserted into the tail plug or the shaft tube.

  Since the present invention is configured as described above, it is possible to suppress the outflow of ink due to the pressing of the batting, and to improve the workability when assembling the batting or replacing the batting.

It is a perspective view which shows an example of the batting type | formula writing instrument which concerns on this invention. It is a whole sectional view of the batting type writing instrument. It is a full sectional view showing an example of a shaft tube. It is a perspective view which shows an example of a tail plug. It is the figure which looked at the tail plug from the side. It is the figure which looked at the tail plug from the back side. It is the figure which looked at the tail plug from the front side. It is the (VIII)-(VIII) sectional view taken on the line of FIG. It is the (IX)-(IX) sectional view taken on the line of FIG. It is the whole cross-sectional view which shows the state which removed the tail plug and the batting in the batting type writing instrument.

The first feature of the present embodiment is that the shaft tube, the writing body mounted on the front end side of the shaft tube and exposed forward, and the substantially cylindrical tail plug mounted on the rear end portion of the shaft tube And a batting type writing instrument that includes an elongated columnar batting accommodated from the inside of the shaft cylinder to the inside of the tail plug, and that guides the ink impregnated in the batting to the writing body. The inner peripheral surface of the shaft cylinder is provided with a batting holding projection that contacts the outer circumferential surface of the batting inserted in the axial direction and holds the batting, and the batting holding projection is in contact with the outer circumferential surface of the batting. The area is increased in the direction in which the batting is inserted into the tail plug or the shaft tube.
Here, the “tail plug” includes a bottomed cylindrical tail plug that does not include a cursive body, a tail plug that is equipped with a cursive body, and the like.
According to the above configuration, since the contact area of the batting holding projection with the outer circumferential surface of the batting is increased in the direction in which the batting is inserted, the insertion resistance gradually increases when the batting is inserted into the tail plug or the shaft tube. Become bigger. Further, after inserting the batting, the batting is difficult to come off due to friction between the contact surfaces of the batting holding projections and the outer circumferential surface of the batting, and the like is held.
Therefore, for example, compared with the prior art etc. in which the outer peripheral surface of the batting is locally pressed by a rib or the like having a constant thickness to hold the batting, the end of the batting is deformed or caused by the deformation. In addition to suppressing the outflow of ink and the like, it is possible to improve workability when assembling the batting and replacing the batting.

As a second feature, the radially inner end surface of the batting holding projection is formed into a curved surface that follows the outer circumferential surface of the batting.
According to this configuration, it is possible to increase the contact area of the batting holding protrusion with the outer circumferential surface of the batting, and to make it more difficult to remove the batting due to friction of the contact surface.

The third feature is that the plate-shaped receiving member that extends in the axial direction of the shaft cylinder and protrudes further inward in the radial direction than the batting retaining projection in the tail plug or in the shaft tube. One piece is provided, and the end face of the batting is received by the end of the receiving piece.
According to this configuration, the space adjacent to the receiving piece portion is used as a space for taking air into the batting as ink is ejected, or for temporarily storing ink that has flowed out due to dropping or vibration. It can be used as a space.

The fourth feature is that the tail plug is provided so as to be attached to and detached from the shaft tube in the axial direction, and the inner pad is provided with the batting retaining protrusion on the inner peripheral surface of the tail plug, so that the retaining force on the batting on the tail plug side is provided. Was made larger than the holding force with respect to the batting on the shaft tube side.
According to this configuration, if the tail plug is removed from the shaft tube, the batting can be removed together with the tail plug. For example, the batting can be removed without removing the batting by hand.

Further, as a more preferable configuration, a plurality of the batting holding projections are provided at intervals in the circumferential direction, and the protruding inner diameters of the plurality of batting holding projections are made smaller than the outer diameter of the batting.
According to this structure, the holding force by the batting retention protrusion with respect to the batting can be further improved.

Furthermore, as a preferable configuration, a chamfered portion is provided on the end side in the direction opposite to the batting direction in the batting holding projection.
As this structure, insertion resistance at the time of inserting a batting into a tail plug or a shaft tube can be reduced, and workability at the time of assembling the batting or replacing the batting can be improved.

Next, a preferred embodiment having the above features will be described in detail with reference to the drawings.
In the following description, the axial direction of the shaft cylinder means a direction in which the center line of the shaft cylinder extends. Further, “front” means a direction in which the cursive body protrudes on one side in the axial direction of the shaft cylinder. Further, “rear” means a direction opposite to the one side in the axial direction of the shaft cylinder. The “axial cylinder radial direction” means a direction orthogonal to the axial cylinder axis direction. In addition, the “outward direction of the shaft tube diameter” means a direction away from the center of the shaft tube along the shaft tube diameter direction. The “inner cylinder radial direction” means a direction approaching the center of the axial cylinder along the axial cylinder radial direction.

  As shown in FIGS. 1 and 2, the batting type writing instrument is detachably attached to the shaft tube 10, the writing body 20 attached to the front end side of the shaft tube 10 and exposed to the front, and the rear end portion of the shaft tube 10. A substantially bottomed tubular tail plug 30 attached to the shaft, a long cylindrical batting 40 accommodated from the shaft tube 10 to the tail plug 30, and the front end of the shaft tube 10 so as to cover the writing body 20 And a cap 50 that is detachably attached to the side, and is configured to guide ink impregnated in the batting 40 to the writing body 20.

  The shaft cylinder 10 is composed of a tapered front end portion 11 on the front end side, and a long cylindrical cylindrical main body portion 12 extending behind the front end portion 11.

  A plurality of vertical ridges 11 a are provided on the inner peripheral surface of the front end portion 11 on the front end side at intervals in the circumferential direction. These vertical protrusions 11a hold the outer peripheral surface of the writing body 20 by the protruding ends in the axial direction of the shaft cylinder (see FIG. 2). Further, the space between the longitudinal ridges 11a, 11a adjacent to each other in the circumferential direction functions as an air passage that ensures air permeability inside and outside the shaft tube 10.

A plurality of receiving piece portions 11b are provided at intervals in the circumferential direction so as to receive the front end of the batting 40 on the rear side of the vertical protrusion 11a in the front end portion 11.
These receiving piece portions 11 b are projecting piece-like members that protrude radially inward from the inner peripheral surface from the rear half portion of the leading end portion 11, and are close to the outer peripheral surface of the writing body 20. That is, a gap is provided between each receiving piece portion 11 b and the outer peripheral surface of the writing body 20.
The space between the receiving portions 11b, 11b adjacent in the circumferential direction functions as an ink storage portion 11c that temporarily stores the ink when the ink in the batting 40 is suddenly ejected due to a drop impact or the like. To do.

A plurality of vertically long batting engagement projections 12a for pressing and holding the batting 40 in the axial direction are arranged in the circumferential direction near the front opening 11 in the cylindrical main body 12 (FIGS. 2 and 3). reference).
Each batting fitting protrusion 12a is formed in a flat plate shape elongated in the axial direction, and its front end is connected to the rear end of the receiving piece 11b. A convex chamfered chamfered portion 12a1 is formed on the rear end side of the batting engagement protrusion 12a so as to guide the batting 40 forward smoothly.
In addition, as another example of the chamfered portion 12a1, it is also possible to form a flat surface that is inclined.

  Further, near the rear end in the cylindrical main body portion 12, a female screw portion 12b for screw-connecting the tail plug 30 or a shaft tube 10 that is pressed against the tail plug 30 on the front side of the female screw portion 12b. An annular convex portion 12c for sealing the rear end side is provided (see FIG. 3).

The writing body 20 may be configured so that the rear end portion thereof is press-fitted into the front end portion of the batting 40 (see FIG. 2) and the ink impregnated in the batting 40 is guided forward by capillary force, and is made of, for example, a porous resin. It is formed in a substantially axial shape or a substantially axial shape formed by converging a large number of synthetic fibers.
In addition, according to the example shown in FIG. 2, the cursive body 20 has an exposed portion on the front end side of the cursive body 20 formed in a cannonball shape, but as another example, it may be a wedge shape that is cut obliquely. Is possible.

  The tail plug 30 is a bottomed cylindrical member that is detachably attached to the rear end opening of the shaft cylinder 10. On the front side of the outer peripheral surface of the tail plug 30, a male screw part 31 that can be screwed into the female screw part 12b on the rear end side in the shaft cylinder 10 is formed. 10 An annular flange portion 32 is formed in contact with the rear end surface. Around the flange portion 32, a plurality of protrusions 32 a are provided at intervals in the circumferential direction to prevent the batting type writing instrument from rolling and to prevent slipping when the tail plug 30 is removed.

  Further, on the front side of the inner peripheral surface of the tail plug 30, a plurality of batting holding projections 33 (see FIGS. 7 to 9) that contact the outer peripheral surface of the batting 40 and hold the batting 40 are provided. A plurality of receiving piece portions 34 for receiving the rear end surface of the batting 40 are provided behind the batting holding protrusions 33 on the surface.

  Each batting holding projection 33 is formed with a radially inward protruding end surface in a curved surface shape or a flat surface shape (in accordance with a preferred example shown in FIG. 7) that follows the outer peripheral surface of the batting 40. The contact surface area of the projecting end surface that contacts 40 is formed in a substantially V shape in plan view that increases in the direction in which the batting 40 is inserted into the tail plug 30 (hereinafter referred to as the batting insertion direction) (FIG. 9). reference).

Further, a chamfered portion 33a having a convex curved surface is provided on the front end side of the batting holding projection 33 so that the inserted batting 40 can be smoothly introduced without resistance.
A plurality of the batting holding projections 33 are provided at a predetermined interval in the axial direction of the shaft cylinder, and the inner diameters a of the protruding ends of the plural batting holding projections 33 (in detail, as shown in FIG. 8, from the chamfered portion 33a). The inner diameter of the rear portion is set to be slightly smaller than the outer diameter of the batting 40.
More specifically, the inner diameter “a” gradually decreases toward the inner side of the tail plug 30 (right side according to FIG. 8). That is, the height in the radial direction of each batting holding projection 33 gradually increases toward the back side.

Further, according to the illustrated example, the inner diameter a is set slightly smaller than the inner diameter of the radially inward protruding ends of the plurality of batting engagement protrusions 12a on the shaft tube 10 side.
That is, the holding force for the batting 40 by the batting retaining projection 33 on the tail plug 30 side is larger than the holding force for the batting 40 on the shaft tube 10 side.

Further, the receiving piece portion 34 is provided on the back side of the batting holding projection 33 so as to extend rearward from the rear end of the batting holding projection 33 and to protrude radially inward from the batting holding projection 33. A plurality of receiving pieces 34 are provided at predetermined intervals in the circumferential direction at the same intervals as the plurality of batting holding projections 33.
And the front-end part of the some receiving piece part 34 receives the rear-end surface of the batting 40. FIG. Further, in the circumferential direction, the space s between the adjacent receiving piece portions 34 and 34 functions as an air passage for supplying air into the batting 40 as the ink in the batting 40 is consumed. For example, when the ink in the batting 40 suddenly flows out backward, it also functions as an ink storage part that temporarily stores the ink.

  In more detail, the ventilation passage is described in detail between the longitudinal protrusions 11a and 11a on the front end side of the shaft tube 10, between the receiving piece portions 11b and 11b, between the batting fitting projections 12a and 12a, and in the cylindrical main body portion 12. It is a continuous passage composed of a gap between the peripheral surface and the outer peripheral surface of the batting 40, a gap between the inner peripheral surface of the tail plug 30 and the outer peripheral surface of the batting 40, a space s between the receiving piece portions 34, 34 in the tail plug 30, and the like. Further, as described above, the air passage communicates with the rear end surface of the batting 40, but also communicates with the front end surface of the batting 40.

  The batting 40 is configured by storing a large number of synthetic fibers in a thin cylindrical body made of synthetic resin and impregnating the inside thereof with ink.

  Further, as shown in FIG. 2, the cap 50 has a double cylindrical cap main body 51 and a substantially conical shape that prevents insertion of the writing body 20 between the inner cap 51a and the outer cap 51b in the cap main body 51. It is comprised integrally from the shape insertion prevention part 52, and is fitted by the front-end | tip part 11 so that attachment or detachment is possible.

Next, the effect of the above-described batting type writing instrument will be described in detail.
When the rear end portion of the batting 40 is inserted into the tail plug 30 for manufacturing the above-described batting type writing instrument, the batting 40 is guided to the chamfered portions 33 a of the plural batting holding projections 33, and these batting holding projections 33. The inside of the batting 40 is gradually increased, the contact area with each batting holding projection 33 is gradually increased, the insertion resistance thereof is gradually increased, and the rear end surface of the batting 40 has a plurality of receiving pieces in the tail plug 30. It abuts against the front end surface of the portion 34. In this state, the batting 40 is held in the tail plug 30 so as not to fall off due to friction with the plurality of batting holding projections 33 or the like.

  Therefore, when the batting is exchanged as the ink is consumed, as shown in FIG. 10, if the tail plug 30 is removed from the shaft tube 10, the batting 40 can be pulled out integrally with the tail plug 30. It is possible to remove 40 without picking it by hand.

In the holding state, the radially inner end of each batting holding projection 33 and the outer circumferential surface of the batting 40 increase the contact area in a V shape toward the rear, so that the pressing deformation against the outer circumferential surface of the batting 40 is performed. Even in a relatively small state, a sufficient holding force can be obtained.
In addition, since the substantially V-shaped batting holding protrusion 33 suppresses local and sudden pressing deformation with respect to the outer circumferential surface of the batting 40, it is possible to suppress the outflow of ink caused by the deformation and the like. The workability when assembling to the tail plug 30 is also good.

  Further, during writing, the space s between the adjacent batting holding projections 33, 33 in the tail plug 30 acts as an air exchange air passage, so that ink can be ejected smoothly. In addition, even if ink suddenly flows out from the rear end of the batting 40 due to dropping or vibration, the ink can be temporarily stored in the space s.

  In addition, according to the said Example, although the tail plug 30 was formed in the bottomed cylindrical shape, as another example, the writing body other than the said writing body 20 is penetrated and hold | maintained in the center side of the tail plug 30, and this writing is carried out. It is also possible to form a double-headed writing instrument by press-fitting the inner end of the body barrel 10 into the end of the batting 40.

  Moreover, according to the said Example, although the latter was made into the structure which a contact area increases in the batting insertion direction among the batting fitting protrusion 12a inside the axial cylinder 10, and the batting retaining protrusion 33 inside the tail plug 30. As another example, it is also possible to adopt a configuration in which the contact area increases in the insertion direction of both of them.

  Moreover, according to the said Example, although the contact area of this batting holding protrusion 33 and the batting 40 was enlarged by the substantially V-shaped batting holding protrusion 33 which goes to the batting insertion direction, as another example, it goes to the batting insertion direction. It is also possible to configure a batting holding projection (not shown) whose area increases in a stepped manner, a batting holding projection (not shown) whose area increases in a trumpet shape in the batting insertion direction, and the like.

10: Shaft cylinder 20: Cursive body 30: Tail plug 33: Filling holding protrusion 34: Receiving piece part 40: Filling 50: Cap

Claims (4)

A shaft cylinder, a cursive body attached to the front end side of the shaft cylinder and exposed forward, a substantially cylindrical tail plug attached to a rear end portion of the shaft cylinder, and from the inside of the shaft cylinder to the inside of the tail plug In a batting type writing instrument provided with a long columnar batting accommodated over, the ink impregnated in the batting is guided to the writing body,
The inner peripheral surface of the tail plug or the shaft tube is provided with a batting retaining projection that contacts the outer circumferential surface of the batting inserted in the axial direction and holds the batting.
The batting change-type writing instrument, wherein the batting holding protrusion increases a contact area with an outer peripheral surface of the batting in a direction in which the batting is inserted into the tail plug or the shaft tube.   2. The batting type writing instrument according to claim 1, wherein a projecting end surface in the radial direction of the batting holding projection is formed in a curved shape following the outer circumferential surface of the batting.   A plate-shaped receiving piece portion extending in the axial direction of the axial tube and projecting radially inward from the batting retaining projection is provided on the back side of the batting retaining projection in the tail plug or the shaft tube, The batting type writing instrument according to claim 1 or 2, wherein an end face of the batting is received by an end of the receiving piece.   The tail plug is provided so as to be attached to and detached from the shaft tube in the axial direction, and the batting support protrusion is provided on the inner peripheral surface of the tail plug, and the holding force to the batting on the tail plug side is set to the shaft tube side. The padding type writing instrument according to any one of claims 1 to 3, characterized in that it has a greater holding force against the padding.

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