JPS6228454Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water-based ballpoint pen equipped with an ink leakage prevention mechanism.

A water-based ballpoint pen has a spool made of an ink storage tube to which a tip is attached, and the ink storage tube is usually filled with a batting impregnated with water-based ink. This batting is used to hold the ink by the capillary force between the fibers that make up the batting, so that the ink does not flow out unnecessarily, since the water-based ink has a low viscosity and flows extremely easily. If water-based ink is directly filled into the insert without using this batting, the flow of ink cannot be controlled, and the ink will leak from the chip. This tendency is especially noticeable when the writing side is facing downwards. Therefore, when the ink storage tube is not filled with batting, it is necessary to provide an ink leakage prevention mechanism.

As an example of this ink leakage prevention mechanism,
A spout hole is formed in the spout tube, which is attached to a felt and inserted into an ink container, to accommodate a steel ball, and a permanent magnet is attached to the cap so that the ink passage in the spout hole can be opened and closed by the steel ball. , a felt-tip pen that applied the magnetic field of a permanent magnet to a steel ball was already in production in 1973.
-Proposed in Publication No. 16408.

However, when attempting to install the expanded spout hole of the felt pen, that is, the valve seat, on the tip of the ballpoint pen, the outer diameter of the tip of the ballpoint pen is generally approximately
It is extremely small, measuring approximately 1.6 to 2.3 mm, and for this reason, processing the ball and ball holder and joining them together requires a precise and complicated machining process in addition to the original manufacturing of the chip, and there is also the risk of losing the cap. be.

Therefore, this invention does not require precise and complicated processing steps to manufacture ballpoint pen tips.
Moreover, it is an object of the present invention to provide a ballpoint pen which can prevent ink from leaking without requiring a cap and which has an extremely simple structure.

In other words, this invention involves attaching a chip to the tip of an ink storage tube, using the rear end opening of the chip as a valve seat, and inserting a valve made of a magnetic material into the ink storage tube, which can be moved forward and backward. This water-based ballpoint pen is equipped with an ink leakage prevention mechanism, which consists of a shaft that is inserted into the valve and has a permanent magnet fixed on the retracting side of the tip to apply a magnetic field to the valve, and a means for advancing and retracting the core provided on this shaft. .

This idea will be explained below with reference to the drawings.

In the ballpoint pens shown in Figures 1 and 2, 1 is the center, 2 is the barrel, and 3 is the tail plug. The printing medium 1 is formed by joining a chip 6 on which a ball 4 and a ball holder 5 are formed to an ink storage tube 7. A valve 8 made of a steel ball is inserted into the core 1, and this valve 8
By moving the ink, the water-based ink filled in the cartridge 1 is distributed and the ink is prevented from leaking.

Next, the ink leakage prevention mechanism will be explained sequentially from FIGS. 1 and 2. The ink storage tube 7 is made of a non-magnetic material such as plastic. A ring-shaped stopper 9 is provided in the ink storage tube 7 to prevent excessive movement of the valve 8, and the valve 8 is located between the stopper 9 and the tip 6, with the opening at the rear end of the tip 6 serving as a valve seat 10. Then, the core 1 formed in this way is inserted into the shaft 2 consisting of the mouthpiece 11 and the body 12 so as to be able to move forward and backward, and the ring-shaped permanent magnet 13 that provides a magnetic field to the valve 8 is placed on the retreating side of the tip 6 in the shaft 2. Attach. Furthermore, a tail plug 3 is provided on the rear end side of the shaft 2, and the tail plug 3 is connected to the core 1 by pin-fitting, and the tail plug 3 is movably screwed to the shaft 2.

With this configuration, in the writing state shown in FIG. 1, when the tail plug 3 is unscrewed, it will be slightly pulled into the insert 1. At this time, as shown in FIG. 2, the valve 8 does not follow the movement of the core 1 due to the magnetic field of the permanent magnet 13, and therefore the tip 6 contacts the valve 8 and the valve seat 10 closes. This prevents water-based ink from leaking. When the tail plug 3 is screwed onto the shaft 2 in the state of preventing ink from leaking as shown in FIG. The ink will be distributed to the ball 4 (Fig. 1).

Although the ballpoint pen described above is pencil-shaped, it may also be a knot-type ballpoint pen. For example, in FIG. 3, a compression spring 15 is provided in the shaft 2 which is engaged with a protrusion 14 provided on the barrel 1, a knock mechanism is adopted in place of the tail plug 3, and the ballpoint pen is similar to the above-mentioned ballpoint pen except that it does not have the base 11. Shows a ballpoint pen with the same configuration. Therefore, when the core 1 is protruded by the notch, the valve 8 is in the position shown by the solid line, and when the core 1 is recessed by the notch, the valve 8 is in the position shown by the dotted line, and the same effect as in the case of the ballpoint pen described above is achieved. The effect is what is achieved.

As described above, according to this invention, the magnetic valve is inserted into the ink storage tube, making it easy to manufacture the chips.Moreover, a permanent magnet is fixed on the tip retraction side of the shaft into which the ink cartridge is inserted so that it can move forward and backward. It has an extremely simple structure and has the effect of always preventing ink from leaking without worrying about losing the cap.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the ballpoint pen of this invention with the middle part omitted, Fig. 2 is a longitudinal sectional view of the same ballpoint pen in a state where ink is prevented from leaking, and Fig. 3 is a main part of the ballpoint pen showing another embodiment. FIG. DESCRIPTION OF SYMBOLS 1...Insert, 2...Shaft, 3, 15...Means for advancing and retracting the insulator, 6...Chip, 7...Ink storage tube, 8...Valve, 10...Valve seat, 13...Permanent magnet .

Claims (1)

[Scope of utility model registration request] A chip is attached to the tip of the ink storage tube, the rear end opening of this chip is used as a valve seat, and a valve made of a magnetic material is inserted into the ink storage tube. A shaft with a permanent magnet fixed on the retreating side of the chip, which provides a magnetic field to the
A water-based ballpoint pen equipped with an ink leakage prevention mechanism consisting of a means for advancing and retracting the core provided on the shaft.