JPH0617580Y2 - Writing instrument cap - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a cap for a writing instrument that can sufficiently prevent ink from drying out from a pen tip.

(Prior Art) There is known a cap in which an ink drying prevention liquid reservoir is provided in a space inside the cap (pen nib accommodating space) where the pen nib is located when the cap is attached (for example, Japanese Patent Laid-Open No. 52-
74429).

(Problems to be solved by the invention) When the conventional means for preventing ink drying as described above is used, it is necessary to increase the amount of ink drying prevention liquid to be used in order to prevent leakage of the ink drying prevention liquid. Since it is not possible, when the writing instrument is used, the gas of the ink drying prevention liquid escapes from the removed cap, and when the writing instrument is not used, the pen tip storage space of the attached cap may not always be sufficiently isolated from the outside air. Combined with this, it is difficult to maintain the ink drying prevention ability for a long time.

In particular, when the cap is made of synthetic resin, the above-mentioned problem is further exacerbated because the earp itself absorbs and releases the gas of the ink and the ink drying prevention liquid.

(Means for Solving the Problem) The present invention reversely utilizes the gas absorption / release properties of the synthetic resin described above, and is a synthetic resin cap that accommodates the pen tip where the pen tip is located when mounted. A space and an ink drying prevention liquid storage space for storing the ink drying prevention liquid, and these pen nib storage space and ink drying prevention liquid storage space have gas impermeability with respect to the ink drying prevention liquid and gas. The gist is the cap of a writing instrument that is partitioned by a synthetic resin barrier that has absorption and release properties.

(Operation) The ink anti-drying liquid stored in the ink anti-drying liquid storage space is absorbed in a gas state by the shielding wall made of synthetic resin having a gas absorbing / releasing property, and is discharged to the pen nib housing space.

(Embodiment) FIG. 1 attached shows a first embodiment. The cap A1 is made of a synthetic resin appropriately selected from polyethylene, polypropylene, polybutyl terephthalate, polyester, polyacetal, polyamide, melamine resin, urea resin and the like, and is often used for displaying ink color and handwriting width. It has a crown 1. This crown 1 is cap A
It is attached to the cylindrical body portion 2 of No. 1 by press fitting, adhesion, welding or the like to form an ink drying prevention liquid storage space for storing the ink drying prevention liquid 3. Here, examples of the ink drying prevention liquid include water, alcohols such as methyl alcohol, ethyl alcohol, butyl alcohol, and propyl alcohol, aromatic hydrocarbons such as toluene and xylene, glycol solvents, and aliphatic solvents. Depending on the solvent and other gasifying components of the ink, one kind or a combination of two or more kinds is appropriately selected and used. The ink anti-drying liquid 3 may be stored in the ink anti-drying liquid storage space as it is, but for the purpose of improving workability, a fiber bundle of cotton or the like, or a porous material such as urethane or ceramic or the like. It can also be occluded in a capillary manner.

The ink drying prevention liquid accommodating space is separated from the pen nib accommodating space 4 of the cap A1 by a shielding wall 5 made of a synthetic resin that is impermeable to the ink drying prevention liquid and has gas absorbing / releasing properties. . The ink drying prevention liquid 3 is absorbed in the shielding wall 5 in a gas state and is discharged into the pen nib housing space 4. In FIG. 1, a part of the shielding wall 5 is shown to be thin, but it is preferable that the gas of the ink drying prevention liquid 3 is positively discharged only to the nib accommodating space 4. .

Next, FIG. 2 shows a second embodiment. In the previous example, the cylindrical body 2
The cap 1 which is a separate body from the above is used as a stopper for the ink drying prevention liquid 3 and has a shielding wall 5 which is formed integrally with the tubular portion 2.
In the cap A2 of this example, a separate shielding wall 6 is used to seal and fix the ink drying prevention liquid 3 from the inside with respect to the cylindrical body portion 2 whose one end is closed. If a synthetic resin having a larger gas absorbing / releasing property than that of the cylindrical portion 2 is used as the material of the shielding wall 6, the gas release of the ink drying prevention liquid 3 becomes positive with respect to the pen nib accommodating space.

Next, FIG. 3 shows a third embodiment. Cap A3 of this example
Then, the shielding wall 8 is fixed by the fixing member 7 inserted inside the tubular portion 2. The shielding wall 8 is, of course, made of synthetic resin, and is coated with the ink drying prevention liquid 3 in advance as a thin film skin.

Other than the above, it can be appropriately performed. For example, if necessary, divide the ink dryness prevention liquid of different types into multiple parts,
For example, they can be distributed in multiple layers. In addition, the outside of the cap may be covered with a metal or the like to suppress the release of the gas of the ink drying prevention liquid to the outside.

(Effect of the Invention) Since a large amount of the ink anti-drying liquid can be stored and the evaporation of the ink anti-drying liquid at the time of removing the cap can be suppressed, it is possible to suppress the drying of the ink from the pen tip for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIGS. 2 and 3 are sectional views showing essential parts of a second embodiment and a third embodiment of the present invention, respectively. A1, A2, A3 ... Cap, 1 ... Crown, 2 ... Cylindrical part, 3 ... Ink drying prevention liquid, 4 ... Pen tip storage space, 5 ... Barrier, 6 ... Barrier, 7 …… Fixing member, 8 ……
Barrier.

Claims (1)

[Scope of utility model registration request] 1. A cap made of synthetic resin, which has a pen nib housing space in which a pen nib is located at the time of mounting, and an ink drying prevention liquid accommodating space containing an ink drying prevention liquid. A writing instrument cap in which the ink drying prevention liquid storage space is partitioned by a synthetic resin barrier that is impermeable to the ink drying prevention liquid and has gas absorption / release properties.