JP2581454Y2 - Writing instrument cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument cap including an inner cap and an outer cap.

[0002]

2. Description of the Related Art In many cases, an appropriate projection for a different purpose is provided in the inner hole of a writing instrument cap such as a fountain pen, a ball pen, a small tube writing instrument, a fiber pen, a brush, a makeup tool, and a handwriting correction instrument. Is formed. First, a front fitting projection, that is, a projection as a fitting part for preventing the cap from being detached when a cap is attached to the front side of the main body to protect the pen tip. Part, that is, a projection as a fitting part for preventing falling off when a cap is attached to the rear side of the main body at the time of use or display, and then, a circumferential projection for sealing,
That is, these are sealing projections that come into circumferential contact with the main body to prevent drying of the ink.

[0003] It is extremely convenient to form the cap with an inner cap and an outer cap in terms of setting the fitting force and sealing property of these projections. That is, if a material that is relatively hard is selected as the material of the outer cap and a front fitting protrusion or a rear fitting protrusion is provided in the inner hole of the outer cap, a reliable fitting force can be easily obtained. If a material that is relatively soft is selected as the material of the inner cap, and a circumferential projection for sealing is provided in the inner hole of the inner cap, good sealing performance can be easily obtained. However, actually, instead of separately providing the front fitting projection and the rear fitting projection on the outer cap, one fitting projection is provided, and this projection is used for front fitting and rear fitting. Shared.

[0004]

However, due to design requirements, it is not possible to provide a front fitting projection or a rear fitting projection on the outer cap while the cap is composed of an inner cap and an outer cap. In some cases, the front fitting projection and the rear fitting projection must be provided separately. In the inner hole of the inner cap, the sealing peripheral projection, the front fitting projection, and the rear fitting projection are all separately provided.
In this case, first, the fitting force at the front fitting projection and the rear fitting projection must be made as good as possible. In addition, the total length of the inner cap is long because the projections must be provided separately. It is also necessary to pay attention to the fact that the pen tip easily collides with the opening end of the inner cap.

[0005]

A sealing peripheral projection, a front fitting projection, and a rear fitting projection are sequentially provided in the inner hole of the inner cap toward the opening end side, and these projections are located at the same position. In the part that does, a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap,
Further, this gap is not exposed at the opening end of the inner cap. That is, the present invention is a cap for a writing instrument comprising an inner cap and an outer cap, and in the inner hole of the inner cap, a sealing peripheral protrusion, a front fitting protrusion, and a rear fitting protrusion with respect to the main body. Are provided in order toward the opening end side, and a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap at the portion where these protrusions are located, and further, this gap is not exposed at the opening end of the inner cap. The gist of the writing instrument cap will be a gist.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example will be described with reference to the accompanying drawings. In FIG. 1, an outer cap 1 integrally has a clip 2 and a through hole 3. It is obtained by injection molding a synthetic resin such as ABS. Here, the through holes 3 are shown as an example of a design requirement. In addition, inner hole 4
Has a circumferential recess 5, a circumferential protrusion 6, and a groove-like recess 7 at an open end portion. The circumferential recess 5 and the circumferential protrusion 6 are for fixing the inner cap 8. It may be fixed at one place, but 2
The reason for the location is that it is difficult to obtain a large undercut portion in view of molding restrictions. Further, the groove-shaped concave portion 7 improves air communication when the cap is attached to and detached from the main body A.

The inner cap 8 is made of a transparent resin such as polypropylene by injection molding, and is made of a relatively soft synthetic resin. It has a sealing peripheral projection 11, a front fitting projection 12, and a rear fitting projection 13. Further, the outer wall 14 has no gap from the wall of the inner hole 4 of the outer cap 1, that is, the inner wall from the circumferential concave portion 5 to the circumferential protrusion 6.
Although the intrusion of dust from the portion is also prevented, the gap from the circumferential projection 6 to the vicinity of the opening end of the inner cap 4 is small but has a gap 15. The sealing peripheral projection 11 and the front fitting projection 1 which are sequentially arranged toward the opening end side.
2. The position where the rear fitting projection 13 is located is a portion where the gap 15 exists. The gap 15 is used to secure the deformation of the inner cap 8 at these projections and thus to ensure elastic deformation. Even without the gap 15, the gap between the front fitting projection 12 and the rear fitting projection 13 can be reduced. However, the fitting force can be increased. However, plastic deformation is easily caused by repeated attachment and detachment of the cap, so that both projections are peripheral projections or an initial number of projections irrespective of whether they are formed by an appropriate number of projections. .

However, this gap 15 is not exposed at the open end of the inner cap 4. That is, as shown in an enlarged manner in FIG. 2, the opening end portion of the inner cap 8 is a trumpet-shaped enlarged portion 16, which is in contact with the inner wall of the outer cap 1. When the inner cap 8 is inserted into the outer cap 1, the inner cap 8 is slightly elastically contacted. As a result, it is possible to minimize the collision of the pen tip with the opening end of the inner cap 8, and in particular, to prevent the pen tip from being caught in the gap 15. In the illustration,
Although the shape of the enlarged diameter portion 16 is not intended to be gradually reduced in thickness as the diameter is increased, the elastic contact described above, and the elasticity and the shape when the pen tip collides, should be described. It is equitable about stability.

In addition to the trumpet-shaped enlarged portion 16 at the open end of the inner cap 8, the gap 15 may not be exposed at the open end of the inner cap 4. For example, the one shown in FIG. 3 has the gap 15 already covered by the pen tip before insertion by providing the circumferential projection 17 in the inner hole 4 of the outer cap 1. Here, the circumferential protrusion 1
Considering that the pen tip may collide with 7, the portion of the peripheral projection 17 on the cap opening end side (lower portion in the drawing) is a long and gentle tapered wall.

Although not shown, various other functions can be provided. For example, a separate clip may be attached. Further, the fixing of the inner cap to the outer cap may be indirect using a crown as a separate member. Further, in the drawing, the pen tip of the main body A, which is visible at the portion of the through hole 3 of the outer cap 1, is a flat pen tip, specifically, a product (trade name: plastic) by the present applicant. Although it is conscious of the pen tip of a fountain pen, of course, it may be appropriate.

[0011]

According to the present invention, there is provided a writing instrument cap comprising an inner cap and an outer cap, wherein a sealing peripheral protrusion, a front fitting protrusion, and a main body are provided in an inner hole of the inner cap.
The rear fitting projections are provided in order toward the opening end side, and a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap at a portion where these projections are located. Due to design constraints, all of the sealing peripheral protrusion, front fitting protrusion, and rear fitting protrusion must be separately provided in the inner hole of the inner cap. Even if it is, the front fitting protrusion, the fitting force at the rear fitting protrusion can be reliably exerted over a long period of time, and even if the total length of the inner cap becomes longer,
It is possible to prevent the pen tip from hitting and damaging the opening end of the inner cap as much as possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion I in FIG.

FIG. 3 is an enlarged view corresponding to FIG. 2, showing another embodiment of the present invention.

[Description of Signs] 1 outer cap 2 clip 3 through hole 4 inner hole 5 circumferential recess 6 circumferential protrusion 7 groove-like recess 8 inner cap 9 inner hole 10 step 11 sealing circumferential protrusion 12 front fitting protrusion Part 13 rear fitting projection 14 outer wall 15 gap 16 enlarged diameter part 17 circumferential projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A writing instrument cap comprising an inner cap and an outer cap, wherein a sealing peripheral projection, a front fitting projection, and a rear fitting projection are provided in an inner hole of the inner cap with respect to a main body. Provided in order toward the opening end side, and a gap is provided between the outer wall of the inner cap and the inner wall of the outer cap in a portion where these protrusions are located, and further, the gap is not exposed at the opening end of the inner cap. Writing instrument cap that will become.