JPS6112121Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a barrel for a gas pressurized ballpoint pen.

Conventionally, in manufacturing barrels for gas pressurized ballpoint pens in which the ink storage tube also serves as the barrel, the barrel was obtained by extrusion molding thermoplastic synthetic resin such as cured vinyl chloride resin, but extrusion molding According to the authors, it was difficult to change the design due to the molding technology.

Therefore, this idea took advantage of the advantages of injection molding, which allows for flexible design and low manufacturing costs, to mold the cylinder in which the ink is accommodated and the cylinder in which the pressurized gas is sealed. By aligning the axes of these barrels with each other and closely fitting them in a pressurized gas chamber, we provide a barrel for a gas pressurized ballpoint pen that can be adapted to any barrel design and is inexpensive to manufacture. The purpose is to

Hereinafter, one embodiment of this invention will be described based on the drawings. In the figure, 1 is a shaft cylinder, and this shaft cylinder 1 is as follows:
A tip holder 3 holds a tip 2 at the tip, and a tip holder 1 has an ink storage tube in which ink 4 is stored, and a rear tip 1B has a closed end and is filled with pressurized gas. , are joined to each other via fitting step portions 5A and 5B.

The tip shaft 1A is molded by injection molding from a thermoplastic synthetic resin with low gas permeability and excellent solvent resistance, such as vinyl chloride resin or CL resin, and the shape is cylindrical or polygonal. That's fine.

At the tip of the tip shaft 1A, a substantially cylindrical tip portion 6 is provided in a step-like manner protruding from the main body of the tip shaft 1A, and the rear part of the tip 2 is press-fitted into the tip fitting hole 7 of the tip portion 6. be done. A tip holder 3 having a substantially conical cylindrical shape is fitted to the front of the tip 2 so that the tip 2 is exposed through the opening at the tip of the tip holder 3.
It is fixed to the circumference of the tip 6 of the tip shaft 1A by screwing, welding, adhesive, etc. Then, the tip 2 is fixed to the tip shaft 1A by sandwiching the locking band 2A protruding from the tip 2 circumferential body between the front end surface of the distal end portion 6 of the tip shaft 1A and the inner end surface of the tip holder 3. are doing.

In this way, the tip 2 is fitted into the tip 6, and the ink 4 is injected into the tip shaft 1A fixed by the tip holder 3, and the inner surface of the tip shaft 1A is shaped to prevent ink 4 from flowing out. A cylindrical presser body 8 with a slightly smaller diameter is inserted.

Since the rear shaft 1B does not come into direct contact with the ink 4, it is molded from a thermoplastic synthetic resin with low gas permeability, and has a closed rear end and a tip as described above. A stepped portion 5B is formed at the front shaft 1A so as to be able to fit into the fitting stepped portion 5A at the rear end of the front shaft 1A.

The front shaft 1A and the rear shaft 1B formed in this way are bonded in a pressurized chamber (not shown) by mechanical joining using a sealing material, screws, etc., ultrasonic welding, heat welding, or adhesive material. The parts are instantly joined by a joining means such as the one used, and therefore pressurized gas is sealed in the cylindrical body of the rear shaft 1B.

In this invention constructed as described above, the barrel 1 in which the ink is stored and the barrel 1 in which the pressurized gas is sealed are molded separately, so it was impossible to make a long product due to molding technology. Injection molding is now possible, making it possible to respond to changes in design.

In addition, the part that accommodates the ink 4 is made of a material that can withstand the physical properties of the ink, that is, a thermoplastic synthetic resin that has solvent resistance to solvents such as xylene and benzine alcohol, and has low gas permeability. The parts where pressurized gas is sealed can be made of thermoplastic synthetic resin with low gas permeability, allowing for free selection of materials and efficient material arrangement. It can be manufactured at low cost without any loss of functionality.

Furthermore, since the shaft cylinder 1 itself reduces the size of the ink cylinder, the refill cylinder (in which the tip and ink cylinder are integrated), which was conventionally necessary, is no longer necessary, and if the ink cylinder is of the same diameter, the ink can be reduced by 4. A significant increase in the amount of fuel can be expected, and the structure is simplified, allowing for a minimum number of parts.

As mentioned above, according to this invention, it is possible to easily accommodate the diversification of shaft cylinder designs, and
This makes it possible to select the most suitable material that matches the function.
Furthermore, it has extremely useful effects in practice, such as being able to simplify the structure and provide it at low cost.

[Brief explanation of the drawing]

The drawing is an overall sectional view showing one embodiment of this invention. 1... shaft cylinder, 1A... front shaft, 1B... rear shaft, 2
... Chip, 2A ... Locking band, 3 ... Chip holder, 4 ... Ink, 5A, 5B ... Fitting stepped portion, 6
... Tip part, 7 ... Chip fitting hole, 8 ... Presser body.

Claims (1)

[Scope of utility model registration request] In a gas pressurized ballpoint pen whose barrel also serves as an ink storage tube, the barrel in which ink is stored and the barrel in which pressurized gas is sealed are molded separately, and the axes of these barrels are aligned with each other. A barrel of a gas pressurized ballpoint pen, characterized in that the barrel is formed by closely fitting in a pressurized gas chamber.