JPS6139584Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a writing instrument commonly called a color pen, and is characterized by the fact that the cap, which is removed when writing, can be reliably fixed and held at the rear of the main body.

Generally, this type of writing instrument comes in a variety of colors, so for example, the cap, tail plug, etc. are colored in the same color as the writing instrument so that it can be identified at a glance from the outside. When molding, a large number of writing instruments can be easily molded by making the body body common and attaching caps and tail plugs of the same shape but different colors to the body body except for changing the ink part inside. Can be done. However, even though the cap and the tail plug are molded using the same mold and the same set temperature, there are significant dimensional errors due to differences in color pigments, and this error is particularly large in the tail plug, and in the case of the one that is most reduced. There was a problem in that the cap rattled in both the circumferential and axial directions, causing the cap to fall off while writing. The above-mentioned problems occur because, firstly, although the cap and tail plug are molded in the same mold and under the same conditions, dimensional errors occur due to differences in the color pigments; Since the cap and the tail plug are mainly made of synthetic resin such as plastics, combined with the dimensional errors caused by the color pigments mentioned above, it is even more likely that looseness will occur in the fit between the cap and the tail plug. There is a problem.

This idea was created in view of the above circumstances, and it allows tight engagement of the cap to the tail plug while absorbing dimensional errors due to differences in color pigments and dimensional errors inherent in the materials of the cap and tail plug. In other words, it is an object of the present invention to provide a writing instrument which is designed to prevent the cap from accidentally falling off during writing.

Examples of this invention will be described below based on the drawings.

Fig. 1 shows a cross-sectional view of the writing instrument of this invention when not in use, and in the figure, 1 is a cylindrical main body;
Inside it, a batting 3 for storing ink 2 is built-in, and a pen tip 4 protrudes from the tip of the main body 1, and this pen tip 4 is attached to a cap attachment part 1' formed at the tip of the main body 1. Cap 5 to be fitted
Further, the cap 5 is protected by the main body 1
The tail plug 6 is fitted onto the rear end of the main body 1 and protrudes from the main body 1. In this case, tail plug 6
As shown in FIG. 2, a fitting part 6b is formed on one side of the flange part 6a that comes into contact with the rear end of the main body 1, and a protruding part 6c is formed on the other side.
An annular protrusion 6d that engages with a groove (not shown) provided on the inner surface of the main body 1 is provided at an appropriate location of the fitting portion 6b that is fitted into the main body 1. By engaging 6d, the tail plug 6 is prevented from slipping out from the main body 1. Further, a circumferential groove 6e is formed in the protrusion 6c,
As shown in FIG. 3, a protrusion 5a having a triangular cross-section, for example, protruding from the inner surface of the cap 5 can be engaged with the circumferential groove 6e. In this case, the diameter of the protrusion 6c of the tail plug 6 is formed to be slightly larger than the inner diameter of the cap 5.
By performing the fitting in a pressure-fit manner, it is possible to prevent rattling in the circumferential direction, and to prevent rattling in the axial direction, there is a protrusion on the upper corner 6f of the rear end side wall 6e' of the circumferential groove 6e. By displaceably abutting the inclined surface 5a' of 5a, shrinkage errors due to the pigment of the tail plug 6 or the cap 5 can be absorbed. Therefore, when writing as shown in FIG. 4, the cap 5 fitted into the tail plug 6 is firmly and reliably fitted without wobbling in the circumferential and axial directions, and the cap 5 does not fall off when writing. There is no discomfort caused by rattling or rattling.

Note that the protrusions 5a may be provided in an annular shape, or a plurality of protrusions 5a may be provided at appropriate regular intervals.

As described above, the present invention is provided with a cap 5 that protects the pen tip protruding from the tip of the main body 1, and the cap 5 is removably pressed against the rear end of the main body 1. In a writing instrument formed with a protruding tail plug 6 that can be fitted, the tail plug 6 is formed with a flange portion 6a that comes into contact with the rear end of the main body 1, and one of the flange portions 6a has a fitting that fits into the main body 1. A joining part 6b is formed, and a protruding part 6c is formed on the other side,
A circumferential groove 6e is provided in the protruding portion 6c, and an inclined protrusion 5a is formed on the inner surface of the cap 5 so as to be able to displaceably abut on the upper corner portion 6f of the rear end side wall 6e' of the circumferential groove 6e. , the open end 5b of the cap 5 and the flange 6a and protrusion 6c of the tail plug 6 fit together, and the inclined protrusion 5a of the cap 5 and the upper corner 6f of the circumferential groove 6e formed in the tail plug 6 fit together. By fitting, the cap 5 and the tail plug 6 are firmly engaged in the circumferential and axial directions, so that shrinkage occurs due to differences in color pigments during molding of the tail plug or cap. Even if there is a dimensional error caused by the material such as synthetic resin, the cap that is fitted to the tail plug will be firmly and reliably fitted without wobbling in the circumferential or axial direction, and the cap will remain securely in place when writing. It has excellent effects such as eliminating the discomfort caused by falling off or wobbling, and its utility value is remarkable.

[Brief explanation of drawings]

Figure 1 is a sectional view of the writing instrument of this invention when it is not in use, Figure 2 is a cross-sectional side view of half of the tail plug of this invention, and Figure 3 is the fitted state of the tail plug and cap of this invention. FIG. 4 is an enlarged sectional view showing the writing instrument of this invention in a writing state. 1... Main body, 2... Ink, 3... Filling, 4...
...Nib, 5...Cap, 5a...Protrusion, 5
a'... Inclined surface, 6... Tail plug, 6a... Flange part, 6b... Fitting part, 6c... Protrusion part, 6d...
Annular convex strip, 6e... Circumferential groove, 6e'... Rear end side wall, 6
f... Upper corner part.

Claims (1)

[Scope of utility model registration request] A writing instrument comprising a cap for protecting a pen point protruding from the tip of the main body, the writing instrument having a tail plug protruding from the rear end of the main body into which the cap can be removably fitted. The tail plug is formed with a flange portion that comes into contact with the rear end of the main body, one of the flange portions is formed with a fitting portion that fits into the main body, and the other side is formed with a protruding portion, and the protruding portion is provided with a fitting portion that fits into the main body. A circumferential groove is provided on the inner surface of the cap, and an inclined protrusion is formed on the inner surface of the cap so that it can displaceably abut on the upper corner of the rear end side wall of the circumferential groove, and the opening end of the cap and the flange of the tail plug are formed on the inner surface of the cap. The cap and the protruding part fit together, and the slanted protrusion of the cap and the upper corner of the circumferential groove formed on the tail plug fit together, causing the cap and the tail plug to move in the circumferential and axial directions. A writing instrument characterized by being firmly engaged.