JPH038470Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lock-type writing instrument in which a writing instrument cartridge using water-based ink is housed in a barrel so as to be freely retractable.

Notsuku-style writing instruments have excellent operability, but only writing instruments that use extremely viscous ink, such as oil-based ink ballpoint pens, are in practical use, and the handwriting does not penetrate to the back side of the paper or is not very clear. Although there have been many inventions and ideas for writing instruments using water-based ink, which have the advantage of producing fine handwriting and are preferred for general writing, they have not yet been put into practical use. The current situation is that this is not the case. The main reason for this is when the pen tip dries out when the cartridge is not in use (when the cartridge is stored in the barrel) and air flows in through the air hole provided at the front of the writing instrument cartridge, causing the ink inside to dry and causing ink smearing. In order to prevent this, a sealing structure was required within the tip of the shaft cylinder, and this sealing structure was technically extremely advanced, making it impossible to achieve the intended purpose.

Therefore, the applicant came to the conclusion that in order to obtain a practical writing instrument using water-based ink, there was a technical limit to the pursuit of a sealed structure.
As a countermeasure, it was previously proposed that an air hole be provided in the tail plug at the rear of the writing instrument cartridge, and that the writing instrument cartridge be housed in a barrel having an appropriate extrusion mechanism so as to be freely retractable.

However, subsequent research revealed that when storing the writing instrument cartridge in the barrel after use,
An impact is applied to the writing instrument cartridge moving backward due to the elastic force of the elastic member, and the ink stored in the ink storage section is scattered backward, causing the air hole provided in the tail plug to open. The air hole may become blocked by the ink, making it impossible to fulfill its original purpose, or the scattered ink may leak out of the writing instrument cartridge through the air hole, causing damage to the rear of the writing instrument cartridge and its vicinity. It turns out that it can get dirty.

The present invention was developed in view of the above-mentioned circumstances, and its gist is that it has an ink storage part that stores water-based ink, an ink relay part, and a pen tip part, and a tail plug is fixed to the rear part of the pen. In a lock-type writing instrument in which a writing instrument cartridge having an air hole in the tail plug is housed in a shaft cylinder so as to be freely retractable by an extrusion mechanism, an ink reservoir is provided at the front part of the tail plug of the writing instrument cartridge at a distance from the air hole. This is a knob-type writing instrument characterized by having a section.

The present invention will be explained in detail below.

The drawings show an embodiment of the present invention, and reference numeral 1 denotes an ink storage part 2 made of a synthetic fiber bundle, felt, porous elastic body, etc., which stores water-based ink therein, and an ink storage part 2 connected to the ink storage part 2. synthetic fiber bundle,
An ink relay section 3 made of a porous elastic body, a sintered body of synthetic resin powder, a thin synthetic resin rod, etc. is housed (the ink storage section 2 and the ink relay section 3 may be integrated), This is a writing instrument cartridge made of synthetic resin or metal with a pen point 4 (ballpoint pen point in the figure) disposed at the tip, and a tail plug 5 is fixed to the rear of the writing instrument cartridge 1. The tail plug 5 consists of a tail plug part 7 having an air hole 6 formed in the longitudinal direction and an ink storage part 8 having a concave cross section. They are connected by 9. That is, the ink reservoir 8
is provided at a distance from the air hole 6.
The side wall of the ink storage section 8 is provided with two slits 8a for air communication with the ink storage section 2, and the front end surface of the ink storage section 8 is provided with four ribs 8b for locking the ink storage section. It is individually protruded and abuts on the rear end of the ink storage section 2. Incidentally, reference numeral 10 is a rod-shaped body for promoting air circulation within the writing instrument cartridge 1.

Reference numeral 11 is a barrel, and inside the barrel 11, the above-mentioned writing instrument cartridge 1 is inserted into an elastic member 12.
It is placed so that it is biased rearward. 13 is an example of an extrusion mechanism installed in the rear part of the shaft cylinder 11,
To explain this extrusion mechanism, a pusher 14 is arranged at the rear end of the shaft cylinder 11 so as to be able to advance and retreat a certain distance, and an inner stage 15a of a locking member 15 connected to the pusher 14 is provided.
is brought into contact with the rear end of the writing instrument cartridge 1, and an engaging portion 15b protruding from the side tip of the locking member 15 projects outward from the hole 11a of the shaft tube 11. 1
Reference numeral 6 denotes a clip disposed on the rear outer surface of the shaft cylinder 11, and this clip 16 has a V-shaped portion 16a in the front that contacts or approaches the surface of the shaft cylinder 11, and this V-shaped portion 16a has the above-mentioned shape. A hole 16b facing the hole 11a of the shaft cylinder 11 is provided.

In order to make the pen tip part 4 of the writing instrument cartridge 1 protrude from the barrel 11, in FIG.
When the pusher 14 is clicked and the writing instrument cartridge 1 is pushed forward through the locking member 15 against the elastic force of the elastic member 12, the engaging portion 15b of the locking member 15 also pivots at the same time. Move forward in the hole 11a of the tube 11, push the tip of the clip 16 outward, and then cross over the V-shaped portion 16a and push it into the locking hole 16b.
The pen tip portion 4 of the writing instrument cartridge 1 protrudes from the tip of the barrel 11 and becomes ready for writing.

When storing the pen nib 4 of the writing instrument cartridge 1 in the barrel 11, pull the tip of the clip 16 outward with your finger or push down the rear part of the clip 16 to prevent the locking member 15 from engaging. Joining part 15b
When removed from the locking hole 16b of the clip 16, the writing instrument cartridge 1, locking member 15 and presser 1 are removed.
4 moves rearward due to the elastic force of the elastic member 12 within the shaft cylinder 11, resulting in the state shown in FIG. At this time, even if the ink stored in the ink occlusion section 2 in the writing instrument cartridge 1 is scattered backwards due to the impact when the writing instrument cartridge 1 is retreated, this ink will be removed from the tail plug 5.
It is housed in an ink storage part 8 provided at the front part of the writing instrument cartridge 1, and does not reach the front end opening of the air hole 6 of the tail plug part 7, which is spaced apart from the ink storage part 8. Pen nib part 4
If you leave the ink storage part 8 facing down,
The ink inside is stored in the ink storage section 2 again. Note that a liquid-retaining material such as urethane may be placed in the ink storage portion 8.

The extrusion mechanism explained above is an example, and in the present invention, it is possible to employ various conventional extrusion mechanisms.Also, in the above embodiment, the tail plug was constructed of one material, but this The ink storage portion may be formed by configuring the ink storage portion with two members.

As mentioned above, the present invention has an ink storage part that stores water-based ink, an ink relay part, and a pen tip part, a tail plug is fixed to the rear part, and an air hole is provided in the tail plug part. In the knob-type writing instrument in which a writing instrument cartridge is housed in a shaft cylinder so as to be freely retractable by an extrusion mechanism, an ink reservoir part that is spaced from the air hole is provided at the front part of the tail plug of the writing instrument cartridge.
When storing the writing instrument cartridge in the barrel, or
Even if the ink stored in the ink storage part scatters backwards when the pen tip falls upward, the ink is immediately stored in the ink storage part of the tail plug. The air hole will not be blocked by ink, and the ink will not leak out of the writing instrument cartridge through the air hole, and an excellent knock-type writing instrument using water-based ink can be obtained. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a knock-type writing instrument, FIG. 2 is a longitudinal cross-sectional view of a main part of a writing instrument cartridge, and FIG. 3 is a perspective view of a tail plug. 1... Writing instrument cartridge, 2... Ink storage section, 3... Ink relay section, 4... Pen tip section, 5...
... Tail plug, 6 ... Air hole, 7 ... Tail plug part, 8 ... Ink storage part, 11 ... Shaft cylinder, 13 ... Extrusion mechanism.

Claims (1)

[Scope of utility model registration request] A writing instrument cartridge that has an ink storage part that stores water-based ink, an ink relay part, and a pen tip part, a tail plug is fixed to the rear part, and an air hole in the tail plug part is pushed into the barrel. 1. A knuckle-type writing instrument which is stored in a retractable manner by a mechanism, characterized in that an ink reservoir is provided at the front part of the tail plug of the writing instrument cartridge at a distance from the air hole.