JP3657163B2 - Writing instrument cap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument cap.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, writing instrument caps having various structures for attaching a cap to the distal end portion of a writing instrument shaft tube have been proposed. In such a situation, as shown in FIGS. 5 and 6, an annular protrusion 25 in which the front and rear wall surfaces 23 and 24 provided on the outer peripheral surface of the tip portion of the shaft cylinder 21 are inclined (see FIGS. 3 and 4). On the other hand, on the inner peripheral surface of the cap 51, a plurality of engagement projections 52 that can be overcome with respect to the annular protrusion 25 in the process of inserting the cap 51 into the shaft cylinder 21 are provided in a circumferential shape with appropriate intervals. At the same time that the engaging protrusion 52 gets over the annular protrusion 25, an annular step 53 is formed which comes into contact with the front wall surface 23 of the annular protrusion 25 and prevents the shaft cylinder 21 from entering the cap 51. There is a writing instrument cap having a structure that fits into the shaft tube 21 by holding the annular protrusion 25 of the shaft tube 21 with the projection 52 and the stepped portion 53.
[0003]
In addition, a shaft cylinder in which the shaft cylinder is made transparent or semi-transparent is provided so that the remaining amount of ink stored in the shaft cylinder can be visually confirmed. There are provided those formed transparent or semi-transparent, or those formed entirely or transparently on the cap.
[0004]
[Problems to be solved by the invention]
In the cap 51 having the above-described structure, the cap main body 54 is formed transparent and the inside can be seen, the edge line of the engaging protrusion 52 and the stepped portion 53 can be seen from the surface side of the cap. The engagement protrusions 52 can be made inconspicuous even when viewed from the front surface side of the cap 51 by providing the engagement protrusions 52 in a circumferential shape with appropriate intervals and by further reducing the shape. However, in the annular stepped portion 53, the edge line appears as a clear ring line on the surface side of the cap 51, which is not an aesthetically pleasing reality.
[0005]
In view of these actual problems, the present invention has a cap body that is transparent or semi-transparent, and the cap is attached to the inner peripheral surface of the cap with respect to the annular protrusion provided on the outer peripheral surface of the tip of the shaft tube. In a writing instrument cap having a structure in which an engaging projection is provided on the shaft cylinder that can be overcome with respect to the annular protrusion during insertion, and prevents the shaft cylinder from entering the cap by contacting the tip of the shaft cylinder. Thus, it is possible to obtain a cap for a writing instrument having a structure in which outer edge lines such as engagement protrusions constituting the fitting structure are inconspicuous when viewed from the surface side of the cap.
[0006]
[Means for Solving the Problems]
The present invention relates to an annular protrusion provided on the outer peripheral surface of the tip end portion of the shaft cylinder when the cap is mounted on the inner peripheral surface of the cap formed by forming the cap body at least transparent or translucent. A plurality of engagement protrusions that can be overcome are provided at equal intervals around the annular protrusion, and the engagement protrusion gets over the annular protrusion and simultaneously contacts the front wall surface of the annular protrusion into the cap of the shaft tube. the abutting projection engaging projection as many that prevents ingress, and only set at equal intervals in the circumferential shape so as to be positioned between the adjacent engaging projections each other, barrel with the engaging projection and abutting projection This is a writing instrument cap which is fitted to the shaft cylinder by holding the annular protrusion.
[0007]
The abutment protrusion only needs to abut against the front wall surface of the annular protrusion provided on the shaft cylinder to prevent the shaft cylinder from entering the cap, and the shape and size are not specified but are not conspicuous Needless to say, the size is more preferable.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. The writing instrument cap 1 shown in FIGS. 1 to 4 is an annular protrusion having front and rear wall surfaces 23, 24 formed on the outer peripheral surface of the distal end portion 22 of the shaft cylinder 21 so as to be attached to the shaft cylinder 21. 25 has an engaging projection 2 that can be climbed over. The cap body 3 and the clip 4 are formed integrally and transparent. In order to make it easier to get over the annular protrusion 25 of the shaft cylinder 21, the engaging protrusion 2 is formed with the front and rear wall surfaces 5, 6 in a slender shape with a small width, and is equidistant from the inner peripheral surface of the cap 1. There are four circumferentially.
[0009]
In front of the engagement protrusion 2 (on the head 7 side of the cap 1), the engagement protrusion 2 gets over the annular protrusion 25, and the front wall surface 5 of the engagement protrusion 2 and the rear wall surface 24 of the annular protrusion 25 abut. In this state, an abutting protrusion 8 that abuts against the front wall surface 23 of the annular protrusion 25 and prevents further entry of the shaft cylinder 21 into the cap 1 is provided. Four contact protrusions 8 are provided circumferentially at equal intervals so as to be positioned between the engagement protrusions 2.
[0010]
For example, as shown in FIG. 2, the head 7 of the cap 1 has a ball-point pen tip (not shown) disposed at the tip 22 of the shaft cylinder 21 via a base 26. You may provide the sealing member 9 which seals the front-end | tip part, or an inner cylinder (not shown).
[0011]
In the writing instrument cap 1 of the present invention, when the distal end portion 22 of the shaft cylinder 21 is inserted, the annular protrusion 25 comes into contact with the contact protrusion 8 at the same time as the engaging protrusion 2 gets over the annular protrusion 25 of the shaft cylinder 21. The shaft cylinder 21 is prevented from further entering the cap 1 and is mounted by holding the annular protrusion 25 with the engagement protrusion 2 and the contact protrusion 8.
[0012]
【The invention's effect】
Since the writing instrument cap of the present invention has the structure as described above, even if the cap body is formed to be transparent or translucent so that the inside can be visually observed, the engaging protrusion that fits with the annular protrusion provided on the shaft cylinder Since the contact protrusion does not appear as a clear ring line even when viewed from the front surface side of the cap, it is inconspicuous. Furthermore, it can be expressed as a pattern by combining the shapes of the engagement protrusions and the contact protrusions, and there is an advantage that a decorative effect is produced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument cap according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a main part showing a state where the writing instrument cap of FIG. 1 is mounted on a shaft cylinder.
FIG. 3 is a partial enlarged view of a main part in a longitudinal section showing a state immediately before the writing instrument cap of FIG. 1 is fitted into a shaft cylinder.
FIG. 4 is a partially enlarged view of a main section in a longitudinal section showing a state in which the writing instrument cap of FIG. 1 is fitted to a shaft cylinder.
FIG. 5 is a longitudinal sectional view of a main part of a conventional writing instrument cap.
FIG. 6 is a longitudinal sectional view of a main part showing a state in which a conventional writing instrument cap is mounted on a shaft cylinder.
[Name of the symbol]
DESCRIPTION OF SYMBOLS 1 Writing instrument cap 2 Engagement protrusion 3 Cap main body 8 Contact protrusion

Claims (1)

At least on the inner peripheral surface of the cap formed by making the cap body transparent or semi-transparent, and when the cap is mounted on the shaft cylinder, it is possible to climb over the annular protrusion provided on the outer peripheral surface of the tip of the shaft cylinder engaging the engagement protrusion, a plurality circumferentially equidistantly provided appropriate intervals, impede entry into the cap of the barrel engagement projection abuts the front wall of the annular projection at the same time overcome the annular projection the fitting protrusions and the same number of abutting projection and only set at equal intervals in the circumferential shape so as to be positioned between the adjacent engaging projections each other, the barrel of the annular projection with the engaging protrusion and the abutting projection A writing instrument cap that fits into the barrel by holding

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