JPS6111016Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a tank for storing ink,
This invention relates to an improvement of a cap for a writing instrument that uses an ink direct storage method to store ink directly in a tank without using batting.

In general, a writing instrument of direct ink storage type has an ink tank at the rear of the barrel, and has a structure in which the ink in the tank is supplied to the nib via a flow rate regulator. In this case, the flow rate regulator is designed to prevent ink from displacing the ink in the tank consumed during writing and air, and to prevent excess ink from dripping from the tank due to expansion of the air in the tank due to temperature rise, etc., from the nib or air hole. , has the role of temporarily storing water.

In the writing instrument constructed as described above, a cap is attached to the writing instrument in order to prevent the pen tip from drying and ink from evaporating from the air hole when not in use.

As shown in Figure 1, conventional caps have a structure in which the pen tip a and air groove b are isolated from the outside air by an inner cap c, thereby preventing drying of the pen tip a and evaporation of ink from the air groove b. ing. However, with this structure, when putting the cap d on, the tip of the middle cap c formed inside the cap d is fitted from a position not shown in the drawings, so the cap d is inserted with the pen tip a down. If the inner cap c is covered with air, the air is compressed within the inner cap c, and the compressed amount of air enters the tank as bubbles from the air groove b via the regulator e. Therefore, when the cap d is removed, ink corresponding to the air bubbles that have entered the tank overflows into the regulator e and is stored therein. Therefore, if you repeat the above several times,
The ink exceeds the ink storage capacity of the regulator e and flows out from the air groove b, causing a problem of dripping.

This idea was made with the intention of solving the above problems, and it does not compress the air inside the cap when it is attached, and also prevents air bubbles from entering the tank from the air groove of the flow rate regulator. It is an object of the present invention to provide a cap for a writing instrument of direct ink storage type, which is characterized by being able to prevent drying of the pen tip.

Embodiments of this invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a cross-sectional view showing the first embodiment of the cap of this invention. In the figure, 1 is a shaft cylinder, which has a tank 2 for accommodating ink at the rear thereof, and an opening at the tip. A flow rate regulator 3 is attached to the tank 2, and a pen tip 6 protrudes from the tip of a cap 5 connected to the tip of an ink guiding rod 4 inserted into the flow rate regulator 3. The ink is transmitted to the pen tip 6 through the ink guide rod 4. Further, an air hole 7 is bored in the front part of the shaft cylinder 1.

Reference numeral 8 denotes a cap, and a cylindrical cap body 9 is detachably attached to the outer peripheral surface of the tip end of the shaft tube 1.
A crown 12 having a vent hole 10 and a support tube 11 protruding toward the side where the shaft cylinder is attached is fitted into the tip opening of the cap body 9. A cylindrical inner cap 13 that can close the air hole 7 is protruded toward the receiving side. A non-water-absorbing elastic body 14 is provided inside the support tube 11.
is arranged, and when the cap 8 is attached,
vent 1 without compressing the air inside cap 8.
0 to the outside, the air hole 7 of the barrel 1 is closed by the inner cap 13 constituting the closing part, and the pen tip 6 is pushed into the elastic body 14. Therefore, compressed air is not generated within the cap 8 when the cap 8 is attached, and since the air hole 7 is closed by the inner cap 13, there is no inadvertent leakage of ink.
Moreover, since the pen tip 6 protrudes into the non-water-absorbing elastic body 14, it is safely protected without drying out even when not in use.

Figure 3 shows a second embodiment of this invention.
This is a case where the shape of the cap 8 is simplified so that it has the same function as the first embodiment. That is, by forming the air hole 7 in the distal end portion of the barrel 1 into which the inner circumferential surface of the cap body 9 is fitted, the closing portion 13' that closes the air hole 7 is formed on the inner circumferential surface of the cap body 9. Moreover, the structure is simplified by forming the vent hole 10 and the support tube 11 integrally with the cap body 9 without attaching the crown 12.

FIG. 4 shows a third embodiment of this invention, in which consideration is given to further enhancing the drying prevention function of the pen tip 6. That is, the non-water absorbing slider 14a is slidably fitted into the support tube 11, and the slider 14a and the support tube 11 are connected to each other.
By forming an elastic body 14' with a spring 14b disposed between the top side of the pen tip 6, that is, the top side of the cap 8, the pen tip 6 can be easily fixed even when used repeatedly.
This is a case where consideration is given so as not to reduce the drying prevention function of the product. In this case, the slider 14
If a recess 14c for holding the pen tip 6 is formed at the tip of a, that is, the surface protruding from the support tube 11, the pen tip 6 can be further prevented from drying.

Note that other parts in the second and third embodiments are the same as in the first embodiment, so the same parts are given the same reference numerals and their explanations are omitted.

As explained above, the cap of this invention has a blocking part that can close the air hole drilled in the barrel on the inner periphery of the cap body which is removably attached to the outer circumferential surface of the tip of the barrel. A ventilation hole is provided at the top of the cap body to communicate between the inside of the cap and the outside, and a support tube is provided that protrudes from the inside of the top toward the opening of the cap, and the pen tip is sealed and protected within this support tube. Since the cap is made of a non-water-absorbing elastic material, compressed air will not be generated inside the cap when the cap is attached, and since the blocking part instantly blocks the air hole, there will be no air bubbles inside the tank. There is no chance of it getting in, and since the pen tip is sealed and protected by an elastic material, the pen tip will not dry out even when not in use, and will not be scratched at the beginning of the next writing. Of course, it has the effect of completely eliminating the dripping phenomenon, and its utility value is remarkable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional cap in its attached state, Fig. 2 is a sectional view showing a first embodiment of the cap of this invention in its attached state, and Figs. 3 and 4 are respectively sectional views of the cap according to this invention. FIG. 7 is a sectional view showing second and third embodiments. 1... Barrel, 2... Tank, 3... Flow rate regulator, 4... Ink guiding rod, 5... Cap, 6... Pen tip, 7... Air hole, 8... Cap, 9... Cap body, 10...Vent hole, 11...Support tube,
12... Crown, 13... Middle cap (occlusion part),
13'...Occluded portion, 14...Elastic body, 14a...
Slider, 14b... Spring, 14c... Holding recess.

Claims (1)

[Claims for Utility Model Registration] 1. An ink direct storage type that has a tank for storing ink inside the barrel, and a pen tip is equipped on the tip side of the barrel via an ink flow rate regulator. In the writing instrument, a cylindrical cap body that is removably attached to the outer circumferential surface of the tip of the barrel is provided with a closing portion that can close an air hole formed in the barrel, and the cap body A vent hole is formed in the top or side of the cap to communicate the inside of the cap with the outside, and a support tube is formed from the inner surface of the top toward the opening side of the cap, and the nib can be hermetically protected within this support tube. A cap for a writing instrument that directly stores ink and is made of a non-water-absorbing elastic material. 2. The ink according to claim 1, wherein the elastic body is composed of a non-water-absorbing slider that slides inside the support cylinder, and a spring disposed between the slider and the top side of the support cylinder. Direct storage type writing instrument cap.