JPH0674379U - Writing instrument cap - Google Patents

Abstract

(57) [Summary] [Structure] A cap B in which a positioning contact portion for fitting with the main body A is provided in the inner hole 8. Here, the abutting portion does not have a width in the circumferential direction like the opening end side ridgeline vertical wall portion 13 of the rib 12 provided in the inner hole 8 and is a plurality of pieces which are perpendicular to the fitting direction. It is provided as a wall part of. [Effect] Even with a pen tip having a thin tip, which is particularly susceptible to damage, it is possible to prevent the pen tip from being easily deflected to the side even when attempting to collide with the abutting portion, and to prevent damage. It is also possible to reliably perform positioning at the time of fitting with respect to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument cap having a positioning abutting portion for fitting with a main body inside an inner hole. In particular, it is suitable for a pointed fiber nib, a resin nib, a ball nib, a small tube nib, and the like in which the main body has a thin nib.

[0002]

[Prior art and its problems]

 It is common to provide a cap with a positioning abutting portion for fitting with the main body. In many cases, the abutting portion uses the opening end wall portion of the cap. However, some of them are provided in the inner hole of the cap. That is, there is also a case in which a circumferential step portion having a smaller inner diameter side of the cap inner hole than the opening end side is provided in the inner hole, and the opening end side wall portion of this step portion is used as the contact portion. Here, the advantage of providing the abutting portion in the inner hole of the cap is, for example, that in a so-called raw ink type writing instrument in which a temporary ink reservoir member is interposed between the ink tank portion and the pen tip portion. Can be mentioned. That is, if a contact portion is provided near the sealing wall portion provided in the inner hole of the cap to prevent the ink from drying, the positional accuracy of the sealing wall portion with respect to the main body when the cap is fitted is increased, and the pump is Phenomenon (When the cap is attached / detached, the air pressure in the space inside the cap suddenly changes, and due to this air pressure change, ink is unnecessarily accumulated in the temporary ink reservoir of the temporary ink reservoir member. This is a phenomenon in which the function of the static ink reservoir is impaired, and air is introduced into the ink tank with priority over ink, despite the fact that ink is temporarily stored in the ink reservoir). Occurrence can be suppressed.

When the contact portion is provided inside the inner hole of the cap, it is preferably provided at a position separated from the opening end. This is to reduce the possibility of the tip of the pen tip of the main body colliding with the contact portion and being damaged during the cap fitting operation. However, it may not always be possible to reliably prevent the tip of the pen tip from colliding with the abutting part due to design requirements such as making the cap short and other requirements for the structural surface.

[0004]

[Means for Solving the Problems]

 The abutting portion is provided as a plurality of wall portions having no width in the circumferential direction and perpendicular to the fitting direction. That is, the present invention relates to a cap of a writing instrument having a positioning contact portion for fitting with a main body in an inner hole, wherein the contact portion does not have a width in the circumferential direction, and The gist is a cap of a writing instrument characterized by being provided as a plurality of walls perpendicular to the.

[0005]

【Example】

 An example will be described based on the attached FIGS. 1 to 8. In FIG. 1, the main body A uses the rear inner hole 2 of the shaft 1 as an ink tank as it is, and a temporary ink reservoir member 3 having a temporary ink reservoir having a comb-like vertical cross section is provided from the front of the shaft 1. Inserted and fixed. A tip holder-4 is attached to the tip of the temporary ink reservoir member 3, and a pen tip 5 protruding from the tip holder-4 is attached to an ink guide core body 6 extending in the temporary ink reservoir member 3 at a rear end portion thereof. Is embedded. This is an example of the above-mentioned raw ink type. Of course, the main body may be a so-called batting type in which the ink is stored in the ink occlusion body. The cap B is fitted to the main body A. The fitting is a so-called concavo-convex fitting in which a plurality of (four in the figure) projections 9 are appropriately fitted into the inner hole 8 of the cap B with respect to the annular recess 7 provided on the outer wall of the shaft 1. Although it is based on one type, it may be based on press fitting. The shaft 1 and the cap B are preferably made of the same synthetic resin.

As shown in FIG. 2, in the inner hole 8 of the cap B, various projections are provided in addition to the projection 9. A protrusion 10 for suppressing lateral shake at the time of fitting operation, an annular protrusion 11 having a top as a sealing wall that circumferentially abuts the shaft 1 of the main body A to prevent ink from drying, and a plurality of them as appropriate. The ribs 12 are provided individually (four in the figure).

As shown in an enlarged view in FIG. 3, in the state of FIG. 1, the opening end side wall portion 13 of the rib 12 is in contact with the tip end wall portion of the shaft 1 of the main body A. That is, since the opening end side wall portion 13 of the rib 12 serves as a positioning contact portion at the time of fitting with the main body in this example, as shown in FIGS. 4 to 8, it is gentle as a whole. In the rounded rib 12, the opening end side wall 13 is exceptionally ridged. Therefore, the opening end side wall portion 13 has no width in the circumferential direction. It also has multiple walls that are perpendicular to the mating direction. In FIG. 5, the rib 12 seems to be separated from the inner hole 8, but the rib 12 is provided in the inner hole portion where the diameter gradually changes.

The shape of the rib 12 is appropriate. For example, the opening end side wall portion 13 may have a ridge-like shape. This can be easily understood because the contact between the generatrix of the cone and the plane becomes a line. Further, for example, the cross-section that is arcuate in FIGS. 6 to 8 may be trapezoidal or the like. Further, for example, as shown in FIG. 9 corresponding to FIG. 4, it has a constant width except for a part on the opening end side, or as shown in FIG. It may have a target portion, or in FIG. 9, the rib 12 may have a constant width that widens in the lower part of the drawing, and may be integrated with the adjacent rib 12. Therefore, it may not be understood as an independent part or shape of “rib”.

[0009]

[Effect of device]

 The writing instrument cap of the present invention is a writing instrument cap in which a positioning abutting portion for fitting with the main body is provided in the inner hole, and the abutting portion is a wall portion having no width in the circumferential direction. Therefore, even with a pen tip with a thin tip that is particularly susceptible to damage, it is possible to prevent the pen tip from slipping aside easily even when trying to collide with the abutting part, and to prevent damage. Similarly, since the abutting portion is provided as a plurality of wall portions that are perpendicular to the fitting direction, even when the abutting area is narrow, the positioning at the time of fitting with respect to the main body can be ensured. .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a fitted state of a main body and a cap, which illustrates an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a cap for explaining an embodiment of the present invention.

FIG. 3 is an enlarged view of part I in FIG.

FIG. 4 is a longitudinal sectional view of a main part of the cap shown in FIG.

5 is a cross-sectional view taken along the line EE of FIG.

6 is a cross-sectional view taken along the line of FIG.

FIG. 7 is a horizontal cross-sectional view taken along the line of FIG.

FIG. 8 is a cross-sectional view taken along the line Ni of FIG.

FIG. 9 is a longitudinal sectional view of a cap, which corresponds to FIG. 4 and illustrates another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a cap corresponding to FIG. 4, illustrating another embodiment of the present invention.

[Explanation of symbols]

 A Main body 1 Shaft 2 Rear inner hole 3 Temporary ink reservoir member 4 Tip holder-5 Nib 6 Ink guiding core 7 Annular recess B Cap 8 Inner hole 9 Projection 10 Projection 11 Annular projection 12 Rib 13 Opening end side wall

Claims (1)

[Scope of utility model registration request] 1. A cap of a writing instrument, wherein a positioning abutting portion at the time of fitting with a main body is provided in an inner hole, wherein the abutting portion has no width in the circumferential direction and is in the fitting direction. A writing instrument cap characterized by being provided as a plurality of vertical walls.