JP7008343B2 - Direct liquid brush pen - Google Patents

Description

The present invention relates to a direct liquid brush pen, and more specifically, a direct liquid brush pen capable of holding sufficient ink in the brush tip and preventing ink leakage by operating a cap. It is about.

As a brush pen, a type in which ink is stored in a shaft made of a flexible material and the shaft is pushed during use to supply ink to the brush tip is common. In the case of this type, if pressure is inadvertently applied to the shaft during storage, etc., the ink will be excessively pushed out to the tip of the brush, and excess ink will accumulate in the cap, and when the cap is removed, it will hang down and move around. The problem of getting dirty arises. Such a problem also occurs when the stirring operation is performed with the cap closed, or when the pressure in the shaft changes due to a temperature change. In such a state where the brush tip is excessively impregnated with ink, writing is hindered.

Therefore, it is conceivable to adopt a valve mechanism to supply an appropriate amount of ink to the brush tip, but since the pen tip in the case of a brush pen is a soft brush, a general valve mechanism that pushes the pen tip to open the valve is adopted. You can't.

Japanese Patent No. 6423555 Japanese Patent Application Laid-Open No. 2003-136882

As mentioned above, in the case of a conventional brush pen, when pressure is inadvertently applied to the shaft during storage, etc., when stirring is performed, or when pressure changes occur in the shaft due to temperature changes, etc. There is a problem that the ink oversupplied to the brush tip accumulates in the cap, and when the cap is removed, it drips and stains the surroundings, and there is a problem that it interferes with writing. Therefore, there is a situation that it is not possible to adopt a valve mechanism that opens the valve by pushing the pen tip.

Therefore, in the present invention, there is a possibility that ink may be excessively supplied to the brush tip when pressure is applied to the shaft during storage or when a stirring operation is performed, or when a pressure change occurs in the shaft due to a temperature change. Since there is no risk of excess ink accumulating in the cap, it can always be used in a clean state without polluting the surroundings, and it is a direct liquid type that can always supply the brush tip with an amount of ink suitable for writing. The challenge is to provide a brush pen.

The invention according to claim 1 for solving the above problems is an ink cartridge for storing ink, a bulb unit between the ink cartridge and the brush tip, and a valve unit for supplying an appropriate amount of ink to the brush tip. The lower half is fixed to the ink cartridge, the joint shaft holding the valve unit in the upper half, the nose piece covering the upper half of the joint shaft and the base of the brush tip, and the nose piece. It consists of a cap that is screwed on to cover the brush tip.
The valve unit includes a valve case, a return spring loaded in the upper half of the valve case, a cup attached to an ink introduction tube formed in the lower half of the valve case, and a lower half of the brush tip. Consists of a brush tip holder that holds firmly
The cap has an annular step portion on the inner surface for pressing the brush tip holder that holds the brush tip when screwed to the nose piece, and the valve is pressed as the brush tip holder is pressed by the annular step portion. It is a direct liquid type brush pen characterized in that the ink flow path in the unit is closed.

In one aspect of the present invention, the brush tip holder has a valve core extending downward, and as the cap is pressed by the annular step portion, the valve core causes the valve core to reach the center of the lower half of the valve case. The formed ink passage is closed, and the ink flow gap between the brush tip holder and the valve case is closed.

In one aspect of the invention, the cap has a double annular step, the inner annular step of which acts to press the brush tip holder, and the outer annular step of the nosepiece. By hitting the upper surface, it acts to regulate the threaded end of the cap.

In one aspect of the present invention, the upper part of the inner peripheral surface of the nose piece is in close contact with the outer peripheral surface of the brush tip holder to seal the portion, and the inner peripheral surface below the sealed portion and the outer peripheral surface of the brush tip holder. An ink flow gap is generated between the surface and the ink flow gap, an ink introduction port is opened at the ink flow gap facing portion of the brush tip holder, and the ink in the ink flow gap passes through the ink introduction port and the ink in the ink flow gap is the brush tip. It can soak.

The direct liquid type brush pen according to the present invention is as described above, and has a function of pressing the brush tip holder that holds the brush tip when the cap is screwed to the nose piece, and the brush tip holder is pressed by the cap. As a result, the ink flow path in the valve unit is closed, so even when pressure is applied to the shaft during storage, stirring operation, or when pressure changes occur in the shaft due to temperature changes, etc. As long as the cap is attached, ink will not be oversupplied to the brush tip, and there is no risk of excess ink accumulating in the cap, so it can always be used in a clean state without polluting the surroundings, and the brush tip can be used at any time. It is possible to supply an amount of ink suitable for writing to the ink, and there is an effect that the state suitable for writing can be maintained at all times.

It is a front view of one Embodiment of the direct liquid type brush pen which concerns on this invention. It is a vertical sectional view in the state which the cap of the direct liquid type brush pen which concerns on this invention is removed. It is a vertical cross-sectional view which shows the sealing action (1st and 2nd steps) by the cap of the direct liquid type brush pen which concerns on this invention. It is a vertical sectional view which shows the sealing action (third, fourth stage) by the cap of the direct liquid type brush pen which concerns on this invention. FIG. 3 is an enlarged cross-sectional view of a main part showing a sealing action (fourth stage) by a cap of a direct liquid brush pen according to the present invention. It is a vertical sectional view which shows the shape example of the valve case in the direct liquid type brush pen which concerns on this invention. It is a side view which shows the shape example of the brush tip holder in the direct liquid type brush pen which concerns on this invention. It is a figure which shows the detail of the seal part in the direct liquid type brush pen which concerns on this invention.

The embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the following description, for convenience, the brush tip side is expressed as the upper side (upper end side, tip side, etc.), and the opposite side is expressed as the lower side (lower end side, rear end side, etc.). The direct liquid brush pen according to the present invention is roughly classified into an ink cartridge 1 for storing ink (ink), a brush tip 41 which is a brush, and an appropriate amount of ink for the brush tip 41 between the ink cartridge 1 and the brush tip 41. The valve unit 21 that supplies the ink, the joint shaft 11 whose lower half is fixed to the ink cartridge 1 and holds the valve unit 21 in the upper half, and the nose that covers the upper half of the joint shaft 11 and the lower part of the brush tip 41. It consists of a piece 31 and a cap 51 that is screwed onto the nose piece 31 to cover the brush tip 41 (see FIGS. 1 and 2).

Since the direct liquid brush pen according to the present invention is a bulb type, the ink cartridge 1 is made of a hard resin that does not dent even when pushed. An annular step 2 is formed on the upper portion of the ink cartridge 1, and the portion above the annular step 2 is a male screw cylinder 3 whose diameter is reduced and the male screw 5 is cut. A seal cap 4 is fitted in the opening of the male screw cylinder 3 (FIG. 2). The seal cap 4 is pierced by the ink introduction pipe 16 of the joint shaft 11 described later by screwing the ink cartridge 1 all the way into the joint shaft 11 (see FIGS. 3 to 5). Reference numeral 6 in FIG. 2 indicates an annular packing between the ink cartridge 1 and the joint shaft 11.

The joint shaft 11 is composed of a large diameter portion 12 exposed to the outside and a small diameter portion 13 connected to the upper portion thereof and hidden inside the nose piece 31 so as not to be exposed. The female screw 14 that meshes with the male screw 5 on the outer peripheral surface of the male screw cylinder 3 is cut (see FIG. 2). Further, a partition plate 15 is provided in the middle portion of the small diameter portion 13, and an ink introduction tube 16 projecting downward is formed in the central portion of the partition plate 15. As described above, the ink introduction tube 16 breaks through the seal cap 4 as the ink cartridge 1 is screwed all the way into the joint shaft 11, and acts to introduce the ink in the ink cartridge 1 into the valve unit 21.

The valve unit 21 is incorporated in the space portion 17 above the partition plate 15 of the small diameter portion 13. The valve unit 21 includes a valve case 22 fitted in the space portion 17, a return spring 23 loaded in the upper half portion of the valve case 22, and an ink introduction pipe 24 formed in the lower half portion of the valve case 22. It consists of a cup 25 to be assembled to the brush tip holder 26 and a brush tip holder 26 that firmly holds the lower half of the brush tip 41 (see FIGS. 5 and 6). The cup 25 is assembled to a rib 24a formed on the outer peripheral surface of the ink introduction pipe 24 of the valve case 22, and an ink flow gap 24b is held between the outer peripheral surface thereof and the inner peripheral surface of the valve case 22 ( See FIG. 6).

The brush tip holder 26 has a plurality of ink introduction ports 29, a tubular portion 26a for holding the lower half portion of the brush tip 41, a reduced diameter portion 26b around which the upper portion of the return spring 23 is wound, and a reduced diameter portion 26b. It is provided with a valve core 27 extending downward from the center of the (see FIGS. 5 and 7). Preferably, a flat portion 26c and a tapered portion 26d are provided on the lower surface of the brush tip holder 26, while the opening edge 22a of the valve case 22 is formed on a curved surface (see FIG. 8A). In such a case, the opening edge 22a of the valve case 22 comes into close contact with the flat portion 26c and the tapered portion 26d (sealing portions a and b) of the brush tip holder 26, and the sealing property is further improved. In addition, in order to improve the sealing property at the sealing portion a, an uneven portion may be appropriately provided on the upper surface of the valve case 22 that abuts on the flat portion 26c and / or the flat portion 26c.

Further, the valve core 27 has a tapered portion 27a in the intermediate portion, and the tapered portion 27a is formed in the central portion of the lower half portion of the valve case 22 as the brush tip holder 26 is pressed by an action described later. The ink passage 28 is closed in close contact with the opening edge 28a of the ink passage 28 (seal portion c in FIG. 8B).

The return spring 23 wound around the reduced diameter portion 26b receives the lower surface of the brush tip holder 26 and constantly urges the brush tip holder 26 upward to open the sealing portions a, b, and c.

The nose piece 31 is a cylindrical body that includes a portion from the upper half of the joint shaft 11 to the brush tip holder 26, and the small diameter portion 13 of the joint shaft 11 is tightly fitted to the lower half thereof. The nose piece 31 has an annular step portion 32 in the middle portion of the outer peripheral surface thereof, a portion above the annular step portion 32 is slightly tapered, and a male screw 33 for screwing the cap 51 is cut on the outer peripheral surface thereof. (See Figures 3 and 5).

The upper part of the inner peripheral surface of the nose piece 31 is in sliding contact with the brush tip holder 26 to seal the portion, but the inner peripheral surface below the sealing portion 36 is separated from the outer peripheral surface of the tubular portion 26a of the brush tip holder 26. , An ink flow gap 35 is generated there. Then, as described above, the ink introduction port 29 that opens toward the ink flow gap 35 is opened in the cylinder portion 26a of the brush tip holder 26, so that the ink in the ink flow gap 35 can be used as needed for the ink introduction port 29. It penetrates into the brush tip 41 through.

The cap 51 to be put on the brush tip 41 has a female screw 52 corresponding to the male screw 33 of the nose piece 31 engraved on the lower inner peripheral surface thereof, and is screwed to the male screw 33 of the nose piece 31 via the female screw 52. Covers the brush tip 41. An annular step portion 54 and a protruding ring 55 are doubly formed on the inner peripheral surface of the cap 51 (see FIGS. 4 and 5). The inner annular step portion 54 abuts on the annular upper end surface of the brush tip holder 26 by screwing the cap 51 with respect to the nose piece 31, and further screwing the cap 51 into the brush tip holder 26. It works (see Figures 4 and 5). The outer protrusion 55 is fitted into the annular recess 34 formed on the upper end surface of the nose piece 31 to regulate the threaded end of the cap 51.

In the case of the direct liquid brush pen according to the present invention having the above configuration, in the state shown in FIG. 3A with the cap 51 removed during use, the ink in the ink cartridge 1 is transferred from the ink introduction tube 16 into the space portion 17. It flows freely, rises from there through the ink flow gap 24b on the outer peripheral surface of the cup 25, passes through the gap on the upper end surface of the cup 25, and is between the ribs 24a formed on the outer peripheral surface of the ink introduction tube 24. Go down the gap and enter the cup 25. Then, the ink that has entered the cup 25 rises in the ink passage 28 of the ink introduction tube 24.

Since the brush tip holder 26 is constantly pushed up by the return spring 23 with the cap 51 removed, the valve core 27 opens the ink passage 28. Therefore, the ink that has entered the cup 25 passes through the ink passage 28, fills the upper half of the valve case 22 and the ink flow gap 35, and permeates the brush tip 41 from the ink introduction port 29. Thus, the brush tip 41 contains an appropriate amount of ink and is in a state suitable for writing, and when the ink is reduced by writing, it is automatically replenished by that amount, and a wet state suitable for writing is always maintained.

Then, when the cap 51 is screwed after use, the annular step portion 54 eventually hits the annular upper end surface of the brush tip holder 26 (FIGS. 4A and 4B), and when the cap 51 is further screwed in, the annular step portion 54 is further screwed. The brush tip holder 26 is pushed in, and the flat portion 26c and the tapered portion 26d on the lower surface of the brush tip holder 26 are in close contact with the opening edge 22a of the valve case 22, respectively, and seal the portions (seal portions a and b).

At the same time, the tapered portion 27a of the valve core 27 comes into close contact with the opening edge 28a of the ink passage 28 to block the ink passage 28 (seal portion c), and the ink flows from the ink passage 28 into the upper half of the valve case 22. To prevent. Thus, after that, the supply of ink to the brush tip 41 is cut off, and excess ink does not accumulate in the brush tip 41.

The direct liquid type brush pen according to the present invention is as described above, and when pressure is applied to the shaft during storage or the like, when a stirring operation is performed, or when a pressure change occurs in the shaft due to a temperature change, etc. However, as long as the cap is attached, ink will not be excessively supplied to the brush tip, and there is no risk of excess ink accumulating in the cap, so it can always be used in a clean state without polluting the surroundings. Since an amount of ink suitable for writing is supplied to the brush tip at any time, the brush tip has the effect of always maintaining a wet state suitable for writing, and its industrial utility is great.

1 Ink cartridge 2 Circular stage 3 Male screw cylinder 4 Sealing material 11 Joint shaft 12 Large diameter part 13 Small diameter part 14 Female screw 15 Partition plate 16 Ink introduction pipe 17 Space part 21 Valve unit 22 Valve case 23 Return spring 24 Ink introduction pipe 24a Rib 24b Ink flow gap 25 Cup 26 Brush tip holder 26a Cylinder 27 Valve core 28 Ink passage 29 Ink inlet 31 Nosepiece 32 Circular step
33 Male screw 35 Ink flow gap 41 Brush tip 51 Cap 52 Female screw 54 Circular step portion 55 Lump ring

Claims (4)

An ink cartridge for storing ink, a brush tip, a bulb unit between the ink cartridge and the brush tip to supply an appropriate amount of ink to the brush tip, and a lower half portion fixed to the ink cartridge in the upper half portion. It consists of a joint shaft that holds the valve unit, a nose piece that covers the upper half of the joint shaft and the base of the brush tip, and a cap that is screwed onto the nose piece to cover the brush tip.
The valve unit includes a valve case, a return spring loaded in the upper half of the valve case, a cup attached to an ink introduction tube formed in the lower half of the valve case, and a lower half of the brush tip. Consists of a brush tip holder that holds firmly
The cap has an annular step portion on the inner surface for pressing the brush tip holder that holds the brush tip when screwed to the nose piece, and the valve is pressed as the brush tip holder is pressed by the annular step portion. A direct liquid brush pen characterized in that the ink flow path in the unit is closed. The brush tip holder has a valve core extending downward, and as the cap is pressed by the annular step portion, the valve core closes an ink passage formed in the central portion of the lower half of the valve case. The direct liquid brush pen according to claim 1, wherein the ink flow gap between the brush tip holder and the valve case is closed. The cap is provided with a double annular step portion, of which the inner annular step portion acts to press the brush tip holder, and the outer annular step portion hits the upper surface of the nose piece to screw the cap. The direct liquid brush pen according to claim 1 or 2, which acts to regulate the leading end. The upper part of the inner peripheral surface of the nose piece is in close contact with the outer peripheral surface of the brush tip holder to seal the portion, and ink flows between the inner peripheral surface below the sealed portion and the outer peripheral surface of the brush tip holder. A gap is generated, an ink introduction port is opened at the ink flow gap facing portion of the brush tip holder, and the ink in the ink flow gap can penetrate into the brush tip through the ink introduction port. Item 6. The direct liquid type brush pen according to any one of Items 1 to 3.

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