JPS6112123Y2 - - Google Patents

Description

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

Conventionally, when assembling the ink cylinder of a gas pressurized ballpoint pen, pressurized gas was introduced into the ink cylinder in a pressurized chamber and then sealed. In addition to being limited, it also required sealing processing.

Therefore, this idea was developed to create a gas pressurized ballpoint pen that uses the elasticity of a rubber-like elastic body to facilitate sealing and improve the retention of pressurized gas, as well as to easily introduce pressurized gas into the ink cylinder. It was devised for the purpose of providing an ink cylinder stopper, and its gist is that a stopper body made of a substantially cylindrical rubber-like elastic body having a diameter slightly larger than the inside diameter of the ink cylinder is provided;
A pressurized gas introduction path communicating from approximately the center in the axial direction to one end surface is formed on the circumferential side of the stopper body, and the end surface where this introduction path is formed is press-fitted into the ink cylinder. It exists.

Hereinafter, an embodiment of this invention will be described based on the drawings. Reference numeral 1 shown in the drawings is a shaft cylinder made of metal or synthetic resin that also serves as an ink cylinder, and this shaft cylinder 1 has an inner circumferential surface with a circular cross section. It is formed into a cylindrical or polygonal tube shape, and a tip (not shown) that holds a ball is fitted and fixed at the tip and filled with ink.

Stopper main body 2 press-fitted into the rear end opening of this shaft cylinder 1
is made of a rubber-like elastic body, and is formed into a substantially cylindrical shape with an outer diameter slightly larger than the inner diameter of the shaft cylinder 1.

As shown in FIG. 2, a groove 3 as a pressurized gas introduction path is formed in the circumferential side surface 2A of the stopper body 2 in parallel with the axis of the stopper body 2, with the base end as one end surface 2B. It is formed with a terminal end provided on the circumferential side surface 2A.

In addition, as shown in FIG. 3, an appropriate number of pressurized gas introduction grooves 3 are formed, with base ends at both side surfaces 2B and 2C, and terminal ends extending to approximately the center of the circumferential surface 2A in the axial direction. Anything is fine.

Furthermore, either one end surface 2B of the stopper main body 2
Alternatively, a hole (not shown) as an introduction path is provided in 2C, with one end opening and the other end opening on the circumferential side surface 2A.
may be formed inside the stopper main body 2.

In short, the introduction passage can be a groove 3 or hole that connects the inside of the barrel 1, i.e., the ink tube, to the outside when one end face of the stopper body 2 is shallowly inserted into the rear end opening of the barrel 1 in advance, and is not limited to the example shown in the figure.

In addition, as described above, the introduction path is formed by separately forming a plurality of grooves 3 or holes opening on both end surfaces 2B and 2C, as shown in FIG. When fitting into the rear end opening of cylinder 1,
Since there is no need to consider the insertion direction of the stopper main body 2, the efficiency of the work of inserting the stopper main body 2 can be improved.

The rear end opening of the shaft cylinder 1 is formed with a slight inclination so that the opening gradually becomes larger toward the rear end. The stopper main body formed by the diameter can be easily inserted into the two-axis cylinder 1,
The inclined surface serves as an insertion guide.

The stopper main body 2 configured in this way is a pressurized type A.
Before inserting the stopper main body 2 into the barrel 1 in the interior, the stopper body 2 is shallowly inserted into the rear end opening of the barrel 1 in advance. In this case, the preliminary insertion is such that the groove 3 or hole serving as the introduction path is exposed to the outside on the circumferential side surface 2A of the stopper main body 2, and the main insertion of the stopper main body 2 in the pressurizing chamber A is performed. At this time, pressurized gas is introduced into the barrel 1, which is an ink cylinder, through the groove 3 or hole, and the work in the pressurized chamber A is simply an operation of pressing and inserting the stopper body 2 into the barrel 1. It will be a good thing if you do it alone.

In this invention constructed as described above, the stopper main body 2 is formed of a rubber-like elastic material, and the stopper main body 2 is press-fitted into the ink cylinder with the end surface where the introduction path is formed as the tip. Due to the elasticity of the plug body 2, the circumferential side surface 2A is brought into close contact with the inner circumferential surface of the shaft cylinder 1, which is an ink cylinder, and the pressurized gas is sealed therein. Since the plug body 2 itself does not move within the barrel 1 even due to gas pressure, the pressurized gas can be completely enclosed.

Since a pressurized gas introduction path is formed that communicates from approximately the center in the axial direction of the circumferential side surface 2A of the stopper body 2 to one end surface, pressurized gas flows in from the introduction path of the stopper body 2 that has been shallowly inserted in advance. Then, the work in the pressurized chamber A is limited to pressing the stopper body 2 into the barrel 1,
This simplifies the manufacturing process and dramatically simplifies the work of filling pressurized gas.

Furthermore, since one of the openings of the inlet passage for pressurized gas formed in the stopper body 2 is provided on the peripheral side surface 2A, leakage of the pressurized gas from the inlet passage can be prevented by the elasticity of the stopper body 2 itself.

As explained above, according to this invention, the manufacturing process of a gas pressurized ballpoint pen can be simplified, the work of filling pressurized gas can be performed with great efficiency, and the simple structure allows pressurized gas to be filled. It has various practical effects such as being able to maintain airtightness.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG.
3 to 3 are a front view and a side view of the stopper main body, and FIG. 4 is a sectional view of a main part in an assembled state, and the arrows shown in FIG. 4 indicate the flow of pressurized gas. A...pressure chamber, 1...shaft cylinder, 2...stopper body,
2A... Circumferential side, 2B, 2C... End surface, 3...
groove.

Claims (1)

[Scope of utility model registration request] A gas pressurized ballpoint pen is provided with a stopper body made of a substantially cylindrical rubber-like elastic body having a diameter slightly larger than the inner diameter of the ink cylinder, and the stopper body is connected from approximately the center in the axial direction of the circumferential side of the stopper body to one end surface. An ink cylinder stopper for a gas pressurized ballpoint pen, characterized in that an ink cylinder stopper for a gas pressurized ballpoint pen is formed, and is pressurized into an ink cylinder with the end face where the introduction path is formed as the tip.