JP2017113902A - Writing instrument with cap member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument with a cap member in which the posture state at the time of fitting the cap member is one and the shape of the cap member is asymmetrical. According to the present invention, a writing element, a shaft cylinder member that holds the writing element in a protruding state at a tip portion, and a cap that can be fitted to the tip portion of the shaft cylinder member so as to cover the writing element. A member, and an alignment convex portion is formed at the tip end portion of the barrel member, and the cap member has an alignment concave portion that fits with the alignment convex portion. It is a writing instrument with a cap member. The alignment convex portion has the largest cross-sectional shape perpendicular to the axial direction at the tip in one half portion when viewed in the circumferential direction, whereas the other half portion when viewed in the circumferential direction is axially oriented. There is a place where the shape of the vertical cross section is larger on the rear side than the tip. The shape of one half of the cap member and the shape of the other half are asymmetric with respect to the writing element. [Selection diagram] Fig. 3

Description

  The present invention includes a writing element, a shaft cylinder member that holds the writing element in a protruding state at a tip portion, and a cap member that can be fitted to the tip portion of the shaft cylinder member so as to cover the writing element. The present invention relates to a writing instrument with a cap member.

Various types of products have been developed for writing instruments with cap members. The shape of the cap member is generally a substantially cylindrical shape, and many cap members can be attached to and detached from the axial tube member without worrying about alignment in the circumferential direction.
In order to improve the designability (decorative property) of the writing instrument with a cap member, the present inventor has intensively studied to limit the circumferential position of the cap member with respect to the axial tube member.

In products where the circumferential position of the cap member is free as in the past, even if the decorative pattern of the shaft tube member and the decorative pattern of the cap member are made continuous, the effect is that the user intentionally performs the alignment operation. It was only demonstrated if you went.
On the other hand, if the circumferential direction of the cap member when fitted to the shaft tube member is limited to a predetermined direction, the effect of making the decorative pattern of the shaft tube member and the decorative pattern of the cap member continuous is always achieved. Impress the user.

As a prior art in which the circumferential direction of the cap member when fitted to the shaft tube member is limited to a predetermined direction, there is a writing instrument described in Patent Document 1. FIGS. 1 and 2 of Patent Document 1 are cited as FIGS. 11 and 12.
In this product, the cap member has an oval cross section, and the corresponding shaft tube member has an oval cross section. If the two members are not aware of the alignment, the cap member is fitted to the shaft tube member. I can't.

No. 2-313194

In the writing instrument described in Patent Document 1, since the shape is symmetrical, the cap member can be fitted to the axial tube member even in a posture in which the longitudinal direction of the oval cross section is reversed. That is, in the writing instrument described in Patent Document 1, there are two types (front and back) of posture states in which the cap member can be fitted to the shaft tube member.
Depending on the design, it is effective to provide continuity between the decorative pattern of the shaft tube member and the decorative pattern of the cap member for each of the two posture states. However, if the posture state at the time of fitting the cap member is limited to one, the range of designs for providing continuity between the decorative pattern of the shaft tube member and the decorative pattern of the cap member is remarkably widened.

  Therefore, the present inventor provides the alignment structure at the location where the shaft tube member and the cap member correspond to each other in the structure of Patent Document 1, so that the posture state at the time of fitting the cap member becomes one. We considered limiting. Although this measure satisfies the requirement that the posture state at the time of fitting the cap member is one, the appearance shape is still symmetric, so the user tries fitting in a posture where the uneven structure does not match. It was found that the product was not attractive as a product.

  The present invention has been made in view of the above-described knowledge, and an object of the present invention is to provide a cap in which there are one posture state when the cap member is fitted and the shape of the cap member is asymmetric. It is to provide a writing instrument with a member.

The present invention includes a writing element, a shaft cylinder member that holds the writing element in a protruding state at a tip portion, and a cap member that can be fitted to the tip portion of the shaft cylinder member so as to cover the writing element. A writing instrument with a cap member, wherein an alignment convex portion is formed at the tip of the shaft tube member, and the cap member has an alignment concave portion that fits into the alignment convex portion. The alignment convex portion has a cross-sectional shape perpendicular to the axial direction in one half as viewed in the circumferential direction, which is the largest at the tip or in the vicinity of the tip. In the half portion, there is a portion where the shape of the cross section perpendicular to the axial direction is larger at the rear side than the front end or the vicinity of the front end. And has a shape corresponding to the other half of the alignment convex portion in the other half when viewed in the circumferential direction. And the shape of one half part of the said cap member and the shape of the other half part are asymmetric with respect to the said writing element, It is a writing instrument with a cap member characterized by the above-mentioned.
According to the present invention, the alignment convex part on the axial tube member side is different in shape between one half part and the other half part as seen in the circumferential direction, and correspondingly, the alignment on the cap member side Since the shape of the concave portion is different between one half and the other half when viewed in the circumferential direction, there is only one posture state when the cap member is fitted, and the shape of the cap member is also asymmetric. ing. Therefore, the possibility that the user tries to fit in an unsuccessful posture is eliminated, and the attractiveness as a product is remarkably high.

Alternatively, the present invention provides a writing element, a shaft tube member that holds the writing element in a protruding state at a tip portion, and a cap member that can be fitted to the tip portion of the shaft member so as to cover the writing element. A cap member having an alignment convex portion formed on the tip portion of the shaft tube member, and the cap member having an alignment concave portion to be fitted to the alignment convex portion. In the writing instrument, the alignment convex portion is formed of a rotating body having a portion having a cross-sectional shape perpendicular to the axial direction on one half as viewed in the circumferential direction and larger on the rear side than the front end or the vicinity of the front end. It has one of the divided shapes, and in the other half when viewed in the circumferential direction, there is a portion larger than the one shape obtained by dividing the rotating body into two on the rear side, and the alignment recess Has a shape corresponding to the one half of the alignment convex portion in one half as viewed in the circumferential direction, and the alignment convex portion in the other half as viewed in the circumferential direction. And the shape of one half of the cap member and the shape of the other half of the cap member are asymmetric with respect to the writing element. And a writing instrument with a cap member.
According to the present invention, the alignment convex part on the axial tube member side is different in shape between one half part and the other half part as seen in the circumferential direction, and correspondingly, the alignment on the cap member side Since the shape of the concave portion is different between one half and the other half when viewed in the circumferential direction, there is only one posture state when the cap member is fitted, and the shape of the cap member is also asymmetric. ing. Therefore, the possibility that the user tries to fit in an unsuccessful posture is eliminated, and the attractiveness as a product is remarkably high.

In each of the above inventions, more specifically, preferably, the other half of the alignment convex portion is an inclined region that rises from the tip to the rear side in the axial direction in at least a partial region. The inclined region smoothly rises from both sides in the circumferential direction of the one half of the alignment convex portion.
When such a configuration is adopted, even if the cap member is twisted to any side in the circumferential direction, the cap member is detached from the shaft tube member so as to be smoothly pushed forward by the presence of the inclined region. it can.

In the other half of the alignment convex portion, in a partial region, from the viewpoint of preventing “sinking” at the time of injection molding of parts and / or for design reasons (aesthetic reasons) It is preferable that a meat stealer is provided. The meat stealer can be provided as, for example, one or two slit-shaped cut portions.
The one half of the alignment convex portion does not need to be changed from a conventional general product, and may be configured in a cylindrical shape along the axial direction, for example.

  As a result of various prototype evaluations by the present inventor, as a specific preferred dimension example, one half of the alignment convex portion is divided into two cylindrical shapes having a cross-sectional diameter selected from a range of 9 to 13 mm. When the top of the inclined region of the alignment convex portion is located at a position away from the cylindrical axis by 1.2 to 1.5 times the radius of the cylindrical shape, a sufficient fitting function It has been confirmed that

  The writing element is not particularly limited at the time of filing the application, and it is not excluded to include pencils, but is generally a nib using ink. In the latter case, it is common that at least one of the shaft tube member and the cap member is provided with an airtight structure for maintaining the airtightness between the shaft tube member and the cap member.

  According to the present invention, the alignment convex part on the axial tube member side is different in shape between one half part and the other half part as seen in the circumferential direction, and correspondingly, the alignment on the cap member side Since the shape of the concave portion is different between one half and the other half when viewed in the circumferential direction, there is only one posture state when the cap member is fitted, and the shape of the cap member is also asymmetric. ing. Therefore, the possibility that the user tries to fit in an unsuccessful posture is eliminated, and the attractiveness as a product is remarkably high.

It is a perspective view of the writing instrument with a cap member in one embodiment of the present invention, and is a figure showing at the time of cap member fitting. It is a perspective view of the writing instrument with a cap member of this Embodiment, Comprising: It is a figure which shows the time of cap member detachment | leave. It is an expansion perspective view of the front-end | tip part of the axial cylinder member of the writing instrument with a cap member of this Embodiment, and a cap member. It is sectional drawing of the front-end | tip part of the axial cylinder member of the writing instrument with a cap member of this Embodiment, and a cap member, Comprising: It is a figure which shows the time of cap member fitting. It is sectional drawing of the front-end | tip part of the axial cylinder member of the writing instrument with a cap member of this Embodiment, and a cap member, Comprising: It is a figure which shows the time of cap member detachment | leave. It is detail drawing of the axial cylinder member of the writing instrument with a cap member of this Embodiment. It is detail drawing of the cap member of the writing instrument with a cap member of this Embodiment. It is an expansion perspective view of the front-end | tip part of the axial cylinder member of the writing instrument with a cap member of other embodiment of this invention. It is a side view of the front-end | tip part of the axial cylinder member of FIG. It is the schematic for demonstrating the modification of a taper surface. The schematic sectional drawing which shows the conventional example of a cap member (FIG. 1 of patent document 1). The schematic sectional drawing which shows the prior art example of a shaft cylinder member (FIG. 2 of patent document 1).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are perspective views of a writing instrument with a cap member according to an embodiment of the present invention. FIG. 1 shows when the cap member is fitted, and FIG. 2 shows when the cap member is detached. FIG. 3 is an enlarged perspective view of the distal end portion of the axial tube member and the cap member of the writing instrument with a cap member according to the present embodiment, and FIGS. 4 and 5 illustrate the relationship between the distal end portion of the axial tube member and the cap member. FIG. 4 is a cross-sectional view, and FIG. 4 shows when the cap member is fitted, and FIG. 5 shows when the cap member is detached.
FIG. 6 is a detailed view of the shaft tube member of the present embodiment, FIG. 6 (a) is a top view, FIG. 6 (b) is a side view, and FIG. 6 (c) is a front side front view. It is. 7 is a detailed view of the cap member of the present embodiment, FIG. 7 (a) is a top view, FIG. 7 (b) is an opening side rear view, and FIG. 7 (c) is a side view. FIG. 7D is a front view of the front end side.

  As shown in FIG. 1 thru | or FIG. 7, the writing instrument 10 with a cap member in this Embodiment has the writing element 20, the axial cylinder member 30 which hold | maintains the writing element 20 in the protrusion part in the front-end | tip part 31, and the writing element 20. And a cap member 40 that can be fitted to the distal end portion 31 of the shaft tube member 30 so as to cover it. The distal end portion 31 of the shaft tube member 30 is formed integrally with the inner tube member 30 i (see FIGS. 3 to 6), and the inner tube member 30 i is fitted into the outer tube member of the shaft tube member 30. (See FIG. 2).

  The writing element 20 of the present embodiment is a felt nib for writing using fluorescent ink. The tip portion 31 of the shaft tube member 30 of the present embodiment is made of resin, and includes a gripping tip portion 32 that grips the writing element 20, an alignment convex portion 33 that performs a fitting function with the cap member 40, and a cap. A flange portion 34 with which the rear end of the member 40 abuts is formed. The cap member 40 is also made of resin, the alignment concave portion 43 that fits with the alignment convex portion 33 of the shaft tube member 30, the second fitting portion 42 that fits with the gripping tip portion 32 of the shaft tube member 30, have. In the present embodiment, the length of the gripping tip portion 32 is 5.0 mm, the length of the alignment convex portion 33 is 4.9 mm, and the length from the tip to the ring bead portion 32b is 2.4 mm. It is.

First, one half portion of the alignment convex portion 33 according to the present embodiment as viewed in the circumferential direction will be described. The said half part is a half part located in the downward side in FIGS. In the half portion (lower half portion) of the alignment convex portion 33, the shape of the cross section perpendicular to the axial direction is the largest at the tip (including a mode smaller than the front end on the rear side (such as meat stealing). May be)).
In the present embodiment, the half portion (lower half portion) of the alignment convex portion 33 has a shape obtained by equally dividing a cylindrical shape having a cross-sectional diameter of 11 mm (constant shape in the axial direction) into two equal parts.

  Next, the other half portion of the alignment convex portion 33 of the present embodiment as viewed in the circumferential direction will be described. The said half part is a half part located in the upper side in FIGS. In the half portion (upper half portion) of the alignment convex portion 33, there is a portion where the shape of the cross section perpendicular to the axial direction is larger on the rear side than the tip (there is a portion bulged on the rear side).

  In the present embodiment, the half portion (upper half portion) of the alignment convex portion 33 is about 30 ° to 35 ° from the front end to the rear side as seen in the axial direction, particularly as shown in FIGS. And an inclined region 33b that climbs at a slope of 33.8 ° in the present embodiment. The inclined region 33b smoothly rises from both sides in the circumferential direction of one half (lower half) of the alignment convex portion 33. As shown in FIG. 6, the top of the inclined region 33b in the present embodiment is located at a position separated from the axis by 7.5 mm (1.36 times the cylindrical shape radius (5.5 mm)).

  Furthermore, the half portion (upper half portion) of the alignment convex portion 33 according to the present embodiment is designed to prevent “sinking” at the time of injection molding of the tip portion 31 and / or on the design. For reasons (aesthetic reasons), two slit-shaped cut portions 33c are provided as meat stealing portions.

  In addition, the upper region 33u at the tip of the half portion (upper half portion) of the alignment convex portion 33 is chamfered by a small amount in order to make the continuity with the inclined region 33b smoother (this embodiment) In the form, the chamfer angle R = 0.6). Such chamfering can also be provided at the tip of the lower half (one half) of the alignment projection 33, in which case the shape of the cross section perpendicular to the axial direction is near the tip. It becomes the maximum (including a mode smaller than the vicinity of the front end on the rear side (may be stealing meat)).

  Next, one half of the alignment recess 43 of the present embodiment as viewed in the circumferential direction will be described. The said half part is a half part located in the downward side in FIGS. 1-7, and has a shape corresponding to one half part (lower half part) of the convex part 33 for alignment. Specifically, a shape obtained by adding a small amount of clearance (about 0.1 mm in this embodiment) to a shape obtained by equally dividing a cylindrical shape having a cross-sectional diameter of 11 mm (constant shape in the axial direction) into two equal parts. It has become.

  Next, the other half portion of the alignment recess 43 of the present embodiment as viewed in the circumferential direction will be described. The said half part is a half part located in the upper side in FIGS. 1-7, and has the shape corresponding to the other half part (upper half part) of the convex part 33 for alignment. Specifically, as shown in FIGS. 4, 5, and 7 in particular, the inclined region 33 b has a shape with a small amount of clearance (about 0.1 mm in the present embodiment). . However, as is apparent from the functional viewpoint, it is not necessary to associate the two slit-shaped cut portions 33c with each other, and such association is not particularly performed.

The shape of the opening surface of the alignment recess 43 is substantially oval as shown in FIG. However, the oval shape has an asymmetrical arrangement with respect to the writing element 20.
Along with the formation of the alignment recess 43 as described above, the overall shape of the cap member 40, particularly as shown in FIGS. 1 to 3, is the shape of one half and the other half. The shape is asymmetric with respect to the writing element 20.

  Further, in the present embodiment, in correspondence with the writing element 20 being a felt pen tip that uses ink, the gripping tip portion 32 of the shaft tube member 30 and the second fitting portion 42 of the cap member 40 In the meantime, a surface fitting region F is provided as an airtight structure for maintaining airtightness. In addition, a ring beat portion 32 b is provided at the gripping tip portion 32 of the shaft tube member 30, and protrusions 42 p are provided at four locations on the second fitting portion 42 of the cap member 40. Thereby, when the cap member 40 is attached / detached, the protrusion 42p gets over the ring beat portion 32b, and the user can feel the resistance as a response to the attaching / detaching operation of the cap member 40.

  According to the present embodiment as described above, the alignment convex portion 33 of the shaft tube member 30 is formed by one half (lower half) and the other half (upper half) as viewed in the circumferential direction. Corresponding to this, the alignment concave portion 43 of the cap member 40 also has a shape corresponding to one half (lower half) and the other half (upper half) when viewed in the circumferential direction. Since they are different, the posture state when the cap member is fitted is limited to one. For this reason, the width of the design which gives continuity to the decorative pattern of the axial tube member 30 and the decorative pattern of the cap member 40 is remarkably widened.

  Moreover, according to this Embodiment, since the shape of the cap member 40 is also asymmetrical, the possibility that a user will try to fit in an unsuccessful posture (alignment) is eliminated, and it is attractive as a product. Is significantly higher.

Further, in the case where the inclined region 33b as in the present embodiment is employed, even if the cap member 40 is twisted to any side in the circumferential direction, the cap member 40 is smoothly moved forward due to the presence of the inclined region 33b. Since it can detach | leave from the axial cylinder member 30 so that it may be extruded, it is highly convenient.
Furthermore, as compared with a product having an oval cross section as in Patent Document 1, since the inclined region 33b is provided only on one side, there is an advantage that it is more compact.

  In addition, according to the present embodiment, by providing the two slit-shaped cut portions 33c, “sinking” at the time of injection molding is prevented, and an accent on the design is also added. Yes.

  In addition, as an actual dimension example, as a result of various prototype evaluations by the present inventor, one half (lower half) of the alignment convex portion 33 has a cross-sectional diameter selected from a range of 9 to 13 mm. It is preferable to have a shape obtained by equally dividing the cylindrical shape having a shape into two, and the top of the inclined region 33b of the alignment convex portion 33 is separated from the axis of the cylindrical shape by 1.2 to 1.5 times the radius of the cylindrical shape. It is preferable that it exists in the position. When such a condition is satisfied, it has been confirmed that a sufficient fitting function can be exhibited.

  8 is an enlarged perspective view of the distal end portion of the shaft tube member of the writing instrument with a cap member according to another embodiment of the present invention, and FIG. 9 is a side view of the distal end portion of the shaft tube member of FIG. It is. In the present embodiment shown in FIGS. 8 and 9, the form of the alignment convex portion 133 is different from the embodiment shown in FIGS. 1 to 7, and the cap member is aligned accordingly. The form of the recess is also different.

With reference to FIGS. 8 and 9, one half of the alignment convex portion 133 according to the present embodiment as viewed in the circumferential direction will be described. The said half part is a half part located in the downward side in FIG.8 and FIG.9. The half portion (lower half portion) of the alignment convex portion 133 has a smaller shape obtained by dividing the truncated conical shape into two parts by a plane parallel to the axis having a maximum cross-sectional width of 11 mm (preferably 9 to 13 mm). Have. That is, in the embodiment shown in FIGS. 1 to 7, a taper is formed on one half (lower half) of the alignment convex portion 33 which is a shape obtained by equally dividing a cylindrical shape having a cross-sectional diameter of 11 mm into two. The form as provided is adopted. From the viewpoint of space saving, the inclination angle of the tapered surface with respect to the axis is preferably about 5 ° at the maximum.
Here, the tapered surface may be formed by a curved tapered surface, as shown in FIG. If such a shape is expressed in a generalized manner, a rotating body having a portion whose cross-sectional shape perpendicular to the axial direction is larger on the rear side than the tip or the vicinity of the tip (when chamfering is taken into consideration) can be expressed in a plane parallel to the axis. It can be said that the smaller shape divided into two or one shape obtained by equally dividing the rotating body by a plane passing through the axis. Note that shapes stealed from these shapes should also be interpreted as being included in these shapes.

Next, the other half portion of the alignment convex portion 133 of this embodiment as viewed in the circumferential direction will be described. The half is substantially the same as the embodiment shown in FIGS. 1 to 7, and there is a portion where the shape of the cross section perpendicular to the axial direction is larger on the rear side than the tip (the portion bulged on the rear side is is there).
That is, the half portion (upper half portion) of the alignment convex portion 133 has a gradient of about 30 ° to 35 ° from the front end to the rear side when viewed in the axial direction (33.8 ° in the present embodiment). The sloped area 133b climbs up, and the sloped area 133b rises smoothly from both sides in the circumferential direction of one half (lower half) of the alignment convex 133. The top of the inclined region 133b of the present embodiment is located at a position separated from the axis by 7.5 mm (1.36 times the maximum width (5.5 mm) of the lower half).

  Furthermore, the half (upper half) of the alignment convex portion 133 according to the present embodiment is provided with a view point of preventing “sinking” at the time of injection molding of the tip portion and / or a design reason. For reasons of aesthetics, two slit-shaped cut portions 133c are provided as meat stealing portions.

  In addition, the upper region 133u at the tip of the half portion (upper half portion) of the alignment convex portion 133 is chamfered by a minute amount so as to make the continuity with the inclined region 133b smoother (this embodiment) In the form, the chamfer angle R = 0.6).

  Next, one half of the concave portion for alignment of the cap member of the present embodiment as viewed in the circumferential direction has a cross-sectional maximum width of 11 mm, and the smaller shape obtained by dividing the truncated cone shape into two parts. In this embodiment, a small amount of clearance (in the present embodiment, a shape to which about 0.1 mm) is added.

  Next, the other half of the alignment recess according to the present embodiment as viewed in the circumferential direction has a shape corresponding to the other half (lower half) of the alignment protrusion 133. Specifically, it is a shape in which a slight amount of clearance (about 0.1 mm in the present embodiment) is added to the inclined region 133b. However, as apparent from the functional viewpoint, it is not necessary to associate the two slit-shaped cut portions 133c with each other, and such association is not particularly performed.

Also in the present embodiment as described above, the shape of the alignment convex portion 133 of the shaft tube member is one half (lower half) and the other half (upper half) when viewed in the circumferential direction. Correspondingly, the concave portion for alignment of the cap member also has a different shape in one half (lower half) and the other half (upper half) when viewed in the circumferential direction. The posture state when the cap member is fitted is limited to one. For this reason, the width of the design which gives continuity to the decorative picture of the axial tube member and the decorative picture of the cap member is remarkably widened.
In addition, according to the present embodiment, since the shape of the cap member is also asymmetrical, the possibility of the user trying to fit in an unsuccessful posture (alignment) is eliminated, and the attractiveness as a product is remarkable. high.

In addition, when the inclined region 133b as in the present embodiment is adopted, even if the cap member is twisted to any side in the circumferential direction, the cap member is smoothly pushed forward due to the presence of the inclined region 133b. Since it can be detached from the shaft tube member as described above, it is highly convenient.
Furthermore, when compared with a product having an oval cross section as in Patent Document 1, since the inclined region 133b is provided only on one side, there is an advantage that it is more compact.

  In addition, according to the present embodiment, the “sink” at the time of injection molding is prevented by providing two slit-shaped cut portions 133c, and an accent on the design is also added. Yes.

1 Writing instrument cap (Patent Document 1)
2 Cap body (Patent Document 1)
2-1 Leg piece (Patent Document 1)
2-2 Small protrusion (Patent Document 1)
3 Inner cap (Patent Document 1)
3-1 Base (Patent Document 1)
3-2 Rib (Patent Document 1)
3-3 Bottomed cylinder (Patent Document 1)
3-4 Recessed gap (Patent Document 1)
3-5 Protrusion (Patent Document 1)
3-6 Bottom (Patent Document 1)
4 shaft tip (Patent Document 1)
10 Writing instrument with cap member 20 Writing element (felt nib)
30 Shaft tube member 31 Tip portion 32 Grasping tip portion 33 Alignment convex portion 33b Inclined region 33c Slit-shaped cut portion 33u Chamfered portion 34 Flange portion 40 Cap member 42 Second fitting portion 43 Alignment recesses 133 and 133 ′ For alignment Convex part 133b Inclined area 133c Slit-like cut part 133u Chamfered part

Claims (7)

A writing element,
A shaft member that holds the writing element in a protruding state at the tip, and
A cap member that can be fitted to the tip of the shaft tube member so as to cover the writing element;
With
An alignment projection is formed at the tip of the shaft tube member,
The cap member is a writing instrument with a cap member that has an alignment recess that fits into the alignment protrusion,
The alignment convex portion has a cross-sectional shape perpendicular to the axial direction in one half as viewed in the circumferential direction, which is the largest at the tip or near the tip, whereas in the other half as viewed in the circumferential direction, There are places where the shape of the cross section perpendicular to the axial direction is larger on the rear side than the tip or the vicinity of the tip,
The alignment concave portion has a shape corresponding to the one half portion of the alignment convex portion in one half portion as viewed in the circumferential direction, and the other half portion in the circumferential direction as described above. It has a shape corresponding to the other half of the alignment convex part,
The writing instrument with a cap member, wherein the shape of one half of the cap member and the shape of the other half are asymmetric with respect to the writing element. A writing element,
A shaft member that holds the writing element in a protruding state at the tip, and
A cap member that can be fitted to the tip of the shaft tube member so as to cover the writing element;
With
An alignment projection is formed at the tip of the shaft tube member,
The cap member is a writing instrument with a cap member that has an alignment recess that fits into the alignment protrusion,
The alignment convex portion has one shape obtained by dividing a rotary body having a portion where the shape of the cross section perpendicular to the axial direction is larger on the rear side than the front end or the vicinity of the front end in one half when viewed in the circumferential direction. And in the other half when viewed in the circumferential direction, there is a place larger than one shape obtained by dividing the rotating body into two on the rear side,
The alignment concave portion has a shape corresponding to the one half portion of the alignment convex portion in one half portion as viewed in the circumferential direction, and the other half portion in the circumferential direction as described above. It has a shape corresponding to the other half of the alignment convex part,
The writing instrument with a cap member, wherein the shape of one half of the cap member and the shape of the other half are asymmetric with respect to the writing element. The other half of the alignment convex portion has an inclined region that rises from the tip to the rear side when viewed in the axial direction in at least a partial region,
The writing instrument with a cap member according to claim 1 or 2, wherein the inclined region smoothly rises from both sides in the circumferential direction of the one half of the alignment convex portion. The writing instrument with a cap member according to claim 3, wherein a meat stealing portion is provided in a partial area on the other half of the alignment convex portion. The writing instrument with a cap member according to claim 1, wherein the one half of the alignment convex portion has a cylindrical shape along the axial direction. The one half of the alignment convex portion has a shape obtained by dividing a cylindrical shape having a cross-sectional diameter selected from a range of 9 to 13 mm into two parts,
6. The top of the inclined region of the alignment convex portion is located at a position away from the cylindrical axis by 1.2 to 1.5 times the radius of the cylindrical shape. Writing instrument with cap member. The writing element is a nib using ink,
The airtight structure for maintaining the airtightness between the shaft tube member and the cap member is provided in at least one of the shaft tube member and the cap member. A writing instrument with a cap member according to the above.

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