JP7430454B2 - liquid dispensing tool - Google Patents

Description

The present invention relates to a liquid discharging tool.

Conventionally, writing instruments such as ballpoint pens and markers, pen-shaped correction fluid, liquid glue, and other applicators that allow liquid to flow out from a tip provided at the front of the shaft body are known, and furthermore, by applying pressure, Structures that can increase the amount of liquid flowing out are also known.
For example, in writing instruments, as in Patent Document 1 (Japanese Unexamined Patent Publication No. 2000-335173), a pressurizing mechanism is provided at the rear of the ink storage tube, and the ink in the ink tank is pressurized in conjunction with the pressing operation of the knock body. There is a structure that can be used. With a writing instrument equipped with such a pressure mechanism, it is possible to increase the amount of ink flowing out from the pen tip, thereby making handwriting thicker or darker.

Japanese Patent Application Publication No. 2000-335173

However, the writing instrument of Patent Document 1 requires a pressurizing mechanism to apply pressure, and the structure becomes complicated, which increases the risk of failure and increases costs. In addition, the ballpoint pen of Patent Document 1 has a structure in which the ink is pressurized in conjunction with the extrusion operation of the knock mechanism, so the amount of pressure cannot be adjusted. Even if this is not necessary, the ink will be constantly pressurized.
In addition, because the structure allows the pressure mechanism to compress only the air in the space behind the refill (liquid storage tube) that stores ink, the ink (liquid) inside the refill can be used without being used. Compared to the compression force when the amount of air in the space behind the refill is small, the compression force when the amount of ink decreases and the amount of air in the space behind the refill increases, so as a result, the amount of air in the space behind the refill is small. When you start using a ballpoint pen where air is easily compressed, a lot of ink is ejected, the ink is consumed and the air in the space behind the refill increases, and when the air becomes difficult to compress, the amount of ink ejected decreases and the ink is The structure is such that the ejection amount of the ink is easily influenced by the remaining amount of the ink.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid discharging tool that is capable of adjusting the pressure applied to the liquid and has a structure in which the pressure is not easily affected by changes in the amount of liquid remaining in the liquid storage tube.

The present invention
"1. A cylindrical dispensing tool body, and a cap that is removably attached to the front and rear of the dispensing tool main body and has one end open and the other end closed,
A liquid dispensing tool for discharging a liquid stored inside the dispensing tool main body from a tip provided in front of the dispensing tool main body,
A liquid storage tube for storing the liquid is provided inside the discharge tool main body,
A first space portion located behind the liquid contained in the liquid storage tube is provided at a rear portion of the liquid storage tube,
having a second space communicating with the first space between the discharge tool main body and the liquid storage tube,
The inner circumferential surface of the cap on the open end side is in sliding contact with the outer circumferential surface of the dispensing tool main body,
having a protrusion on the outer circumferential surface of the dispensing device main body or the inner circumferential surface of the cap;
The inner peripheral surface of the cap or the outer peripheral surface of the dispensing device main body has a spiral groove in which the protrusion slides,
Aligning the protrusion with the spiral groove and attaching the cap while relatively rotating it toward the rear of the dispensing device main body,
While the protrusion slides in the spiral groove,
By moving forward while the inner circumferential surface of the cap on the open end side slides against the outer circumferential surface of the dispensing tool main body,
A liquid discharging device configured such that the liquid is pressurized via compressed air in a closed space formed by the first space and the second space.
2. The liquid discharging tool according to item 1 above,
The dispensing tool main body is provided with a hole communicating with the second space, and when the cap is attached to the rear of the dispensing tool main body, the hole is provided between the cap and the dispensing tool main body. a gas storage portion communicating with the second space portion is formed;
The liquid discharging tool has a structure in which the sealed space is constituted by the first space, the second space, and the gas storage part.
3. The liquid discharging tool according to item 1 or 2 above,
The liquid dispensing tool has a structure in which at least an outer circumferential surface of the dispensing tool main body is displaced in an axial radial direction when the cap is attached to the rear of the dispensing tool main body.
4. The liquid discharging tool according to any one of items 1 to 3 above,
A liquid dispensing device having a structure including an annular convex portion that slides on an outer circumferential surface of the dispensing device main body on an inner circumferential surface on an open end side of the cap.
5. The liquid discharging tool according to any one of items 1 to 4 above,
The cap has a protrusion on the inner circumferential surface, the dispensing tool body has a spiral groove on the outer circumferential surface in which the protrusion slides, and the rear wall of the spiral groove has a protrusion extending rearward. A liquid ejecting tool having a structure having a plurality of recessed portions, and when the projection slides in the spiral groove, the projection is locked in any one of the plurality of recesses in the spiral groove.
6. The liquid discharging tool according to item 5 above,
One of the plurality of recesses in the rear wall of the spiral groove is located at a position where pressurization of the liquid starts and a position where pressurization of the liquid is released with the protrusion of the cap locked. A liquid dispensing device with a structure that ”.

In the liquid dispensing tool of the present invention, the protrusion on the outer peripheral surface of the dispensing tool main body or the inner circumferential surface of the cap is aligned with the inner circumferential surface of the cap or the spiral groove of the dispensing tool main body, and the cap is moved relative to the rear of the dispensing tool main body. When the cap is installed while being rotated, the protrusion slides in the spiral groove, and the inner circumferential surface of the open end of the cap moves forward while slidingly contacting the outer circumferential surface of the dispensing device main body, and the first space It has a structure that pressurizes liquid through compressed air in a closed space consisting of The structure makes it easy to use. Therefore, when attaching the cap by rotating it relative to the rear of the dispensing tool body while the inner peripheral surface of the cap is in sliding contact with the outer circumferential surface of the dispensing tool main body, the amount by which the cap is advanced is adjusted. As a result, the force that compresses the air changes. For example, if the cap is moved forward a little to slightly pressurize the liquid, the amount of ink flowing out from the pen tip will increase slightly, making the handwriting a little thicker. When the cap is moved forward and pressure is applied strongly, the amount of ink that flows out from the pen tip increases, making the handwriting thicker and darker.
In this way, the liquid discharging device of the present invention can change the compressive force of air by rotating the cap, and adjust the pressurizing force on the liquid.

Further, in the liquid dispensing device of the present invention, the length of the pitch of the spiral groove provided on the inner circumferential surface of the cap or the dispensing device main body allows the cap to be attached while being rotated relative to the rear of the dispensing device main body. The amount of advance of the cap can be varied.
By increasing the pitch of the spiral grooves, it becomes possible to move the cap forward by a large amount relative to the amount of rotation, and it becomes possible to pressurize the liquid to a large extent. By shortening the pitch of the spiral grooves, the cap moves forward by a small amount relative to the amount of rotation, making it possible to pressurize the liquid even if the rotation force is weak, and making it easier to use liquids with high viscosity.

Furthermore, since the liquid discharging device having the structure of the present invention compresses the air in the sealed space composed of the first space and the second space, it is possible to pressurize a large volume of air, and the liquid discharging device can pressurize a large volume of air inside the liquid storage pipe. Even if the amount of liquid decreases and the air inside the liquid storage tube increases, the pressurizing force is unlikely to change, and as a result, the amount of liquid discharged can be stabilized.
Furthermore, a hole communicating with the second space is provided in the dispensing tool main body, and when the cap is attached to the rear of the dispensing tool main body, a hole is provided between the cap and the dispensing tool main body through the hole. A gas storage part communicating with the two spaces is formed, and a closed space is formed by the first space, the second space, and the gas storage part, thereby pressurizing a larger volume of air. Therefore, even if the liquid in the liquid storage tube decreases and the air in the liquid storage tube increases, the pressurizing force is less likely to change, and the amount of liquid discharged can be stabilized.

Furthermore, when the cap is attached to the rear of the dispensing tool body, at least the outer circumferential surface of the dispensing tool body is displaced in the radial direction, so that the inner circumferential surface of the cap is brought into close contact with the outer circumferential surface of the dispensing tool main body. This makes it possible to move the robot forward while moving forward, making it possible to efficiently compress the air in a closed space.
In this case, the material of the dispensing device body may be such that the entire dispensing device body or only its surface is molded with soft resin such as polypropylene resin, polyethylene resin, ABS resin, olefin thermoplastic elastomer, styrene thermoplastic elastomer, or polyester. It can be molded from thermoplastic elastomer, polyurethane thermoplastic elastomer, etc. Furthermore, by forming the dispensing tool main body with a thin wall thickness, at least the outer circumferential surface of the dispensing tool main body can be pressed and deformed by the inner circumferential surface of the cap.
Further, the material of the cap is preferably molded from a hard resin such as polycarbonate resin, acrylic resin, or AS resin in order to displace the dispensing tool main body in the axial radial direction on the inner circumferential surface of the cap.

Furthermore, by providing an annular convex portion in sliding contact with the outer circumferential surface of the dispensing tool main body on the inner circumferential surface of the opening end side of the cap, a portion that brings the inner circumferential surface of the cap and the outer circumferential surface of the dispensing tool main body into close contact is provided. can be specified, and airtightness can be achieved efficiently. Note that the annular convex portion provided on the open end side of the cap may be formed integrally with the cap, or may be provided by fixing an O-ring or the like on the inner surface of the cap.

Furthermore, when the cap is attached to the dispensing device body at a position forward of the rear end of the liquid storage portion and at the rear of the dispensing device main body, and when the compression of the air in the sealed space is started, the circle of the cap is By providing a hole that communicates with the second space at a position rearward from the annular convex portion, even if liquid leaks from the rear end of the liquid storage portion, the liquid will flow toward the rear inner side of the dispensing tool body. This makes it easy for liquid to leak out of the main body of the dispensing device.

The cap has a projection on the inner peripheral surface, the outer peripheral surface of the dispensing tool body has a spiral groove in which the projection slides, and the rear wall of the spiral groove has a plurality of holes recessed toward the rear. By having a structure in which the protrusion has a recess and is locked in one of the plurality of recesses in the spiral groove when the protrusion slides in the spiral groove, the user can adjust the pressurized state in stages. It becomes possible to recognize the A protrusion is provided on the inner circumferential surface of the cap, a spiral groove in which the protrusion slides is provided on the outer circumferential surface of the dispensing tool body, and a plurality of recesses are formed on the rear wall of the spiral groove toward the rear. If a recess is provided, the air in the sealed space will be compressed, and the compressive force will push the cap backwards, thereby firmly locking the protrusion of the cap into the recess of the dispensing tool body under pressure. It becomes possible to do so.

In addition, one of the plurality of recesses in the rear wall of the spiral groove has a position where the liquid pressure is released and a position where the liquid pressure starts when the protrusion of the cap is locked. With this structure, when the user attaches the cap while rotating it relative to the rear of the shaft, the user can feel the pressure of the ink when the protrusion of the cap is locked in the recess. When removing the cap while rotating it in the opposite direction relative to the rear of the shaft, you can feel the sensation when the protrusion of the cap is locked into the recess from the opposite side. Therefore, the user can recognize the state immediately before the pressurization of the liquid is released.

Although the shape of the dispensing tool main body is not particularly limited, a rod-like shape like a writing instrument is preferable so that the discharging tool main body can be easily held.

In the case of a writing instrument, the tip may be a ballpoint pen tip, a felt tip, or the body of a fountain pen equipped with a brush tip or a pen core, and in the case of an applicator, a fiber bundle, a sponge, etc. may be mentioned. Since the distal tip is the final path for discharging the liquid in the storage tube to the outside, the size of the liquid flow path and the presence or absence of a valve mechanism will make contact with the rear end of the liquid stored in the liquid storage tube. It is related to the pressurized state of air. For example, if the liquid channel is large, the liquid can be easily discharged even if the pressure is slightly higher than atmospheric pressure. By providing a valve mechanism on the tip, even if the air in the sealed space consisting of the gas storage section, first space, and second space is greatly compressed, liquid will be discharged unintentionally. This can be prevented.

Note that when the atmospheric pressure is 1000 hPa, for example, in the case of writing ink with a low viscosity (as an example, the ink for writing instruments with a viscosity of 1 mPa・s to 2000 mPa・s in an environment of 20° C.), the air in the closed space is By increasing the atmospheric pressure to a range of 1,500 hPa exceeding the atmospheric pressure of 1,000 hPa, it is now possible to make it easier to discharge writing instrument ink. For writing ink with a viscosity of 3000 mPa·s to 50000 mPa·s), the writing ink can be easily discharged by pressurizing the air pressure in the sealed space to a range of 1100 hPa to 5000 hPa. You will be able to do this. However, the numerical value to be pressurized is not particularly limited, and may be appropriately set depending on the characteristics such as the viscosity of the liquid and the structure of the tip as described above.

The liquid is not particularly limited as long as it can be stored in the liquid storage tube, and may be appropriately selected depending on the use of the liquid discharging tool, such as writing ink, correction fluid, liquid glue, cosmetic liquid, etc. The writing ink is not particularly limited, such as oil-based ink or water-based ink, and ink having shear thinning properties can also be used.
In addition, thermochromic inks that use microcapsule pigments containing thermochromic materials as coloring agents generally tend to have difficulty in increasing handwriting density because the capsules contain coloring materials, but the present invention By using a structured liquid ejecting tool, it is possible to increase the density of handwriting by increasing the amount of ink flowing out due to pressurization.
In addition, methods for increasing the density of handwriting of thermochromic ink containing microcapsule pigment include increasing the amount of microcapsule pigment serving as a coloring agent, and increasing the particle size of microcapsule pigment. When the amount of the microcapsule pigment is increased, the viscosity of the ink becomes high and it becomes difficult to flow out, and when the particle size of the microcapsule pigment is increased, the pigment becomes difficult to pass through the ink flow path, and the ink becomes difficult to flow out. There is a risk that it will be difficult for the water to leak out. However, even with such ink, the liquid ejecting tool having the structure of the present invention can be used because the ink can be forcibly ejected by pressurizing the ink.
In addition, even if the ink contains solids with a relatively high specific gravity such as titanium oxide or bright pigments and has a high viscosity when standing to prevent the solids from settling in the liquid, the liquid with the structure of the present invention can be used. Similar to the thermochromic ink containing the microcapsule pigment, the ejection tool can forcibly eject the ink by pressurizing the ink.
Furthermore, even in cases where dry liquid, such as correction fluid or liquid glue, adheres to the distal tip, the liquid can be pressurized to make it easier to discharge.
As described above, the liquid discharging device of the present invention has a structure suitable as a discharging device for various liquids.

According to the present invention, it is possible to adjust the pressure applied to the liquid, and it is possible to obtain a liquid discharging tool having a structure in which the pressure applied is not easily affected by changes in the amount of liquid remaining in the liquid storage tube.

FIG. 2 is a vertical cross-sectional view of the ballpoint pen according to the present embodiment with the cap removed, with a portion thereof shown as a side view. FIG. 2 is a vertical cross-sectional view showing a ballpoint pen of the present embodiment in which the cap is attached to the front of the shaft body, with a portion shown in a side view. It is a partially enlarged view of the shaft body. FIG. 2 is a conceptual diagram showing a first state in which the cap is attached to the rear of the shaft in the ballpoint pen of the present embodiment, and is in a non-pressurized state. FIG. 5 is a conceptual diagram showing a second state in which the cap is rotated and advanced from the state in FIG. 4, and is a state in which pressurization is started. 6 is a conceptual diagram showing a third state in which the cap is further rotated and advanced from the state in FIG. 5, and the ink is pressurized. FIG.

Next, the present invention will be explained with reference to the drawings, but the present invention is not limited to the following embodiments. In this embodiment, a cap-type ballpoint pen will be explained as a liquid discharging tool, but the liquid discharging tool of the present invention can also be used for writing instruments such as markers and fountain pens, applicators such as correction pens and liquid glue, or makeup tools. It is possible to use it in tools.
In this embodiment, the side where the pen tip is located is expressed as the front, and the opposite side is expressed as the rear. In order to make the explanation easier to understand, similar members and similar parts in the drawings are designated by the same reference numerals.

FIG. 1 is a vertical cross-sectional view of the ballpoint pen of this embodiment with the cap removed, and a partially side view.
As shown in FIG. 1, the ballpoint pen 1 (liquid dispensing tool) of the present embodiment has a shaft body 2 (discharging tool main body) composed of a front shaft 3 and a rear shaft 4 screwed onto the front shaft 3. be. A ballpoint pen refill 5 is disposed inside the shaft body 3, and the ballpoint pen refill 5 stores ink 6 (liquid). Behind the ink 6, a grease-like ink follower 7 is disposed. It has been accommodated. The ink follower 7 prevents the ink 6 from flowing backward and moves forward as the ink 6 decreases.
The ballpoint pen refill 5 has a ballpoint pen tip 5b (tip tip) disposed in front of the ink tank 5a ( liquid storage tube ) protruding from the front end opening 3a of the front shaft 3, and a ballpoint pen tip 5b (tip tip) disposed in front of the ink tank 5a (liquid storage tube) protrudes from the front end opening 3a of the front shaft 3. It is held between the reduced diameter portion 3b and a rib 4a formed on the rear inner surface of the rear shaft 4, and is fixed to the shaft body 2.

The gap between the front end opening 3a of the front shaft 3 and the ballpoint pen tip 5b of the ballpoint pen refill 5 is sealed with silicone rubber (not shown). Further, the front shaft 3 and the rear shaft 4 have a press-fitting portion 3d provided in front of the fitting portion 3c of the front shaft 3, and a press-fitting receiving portion 4c provided in front of the fitting receiving portion 4b of the rear shaft 4. It is sealed by being press-fitted.
The shaft body 2 is provided with a round hole 4d having a diameter of 1 mm and centered 10 mm ahead of the rear end 5c of the ink tank 5a on the rear shaft 4.
The rear part of the ink tank 5a has a first space K1 located behind the ink 6 and the ink follower 7 stored in the ink tank 5a, and a first space K1 is provided between the shaft body 2 and the ink tank 5a. It has a second space K2 that communicates with the first space K1. The hole 4d communicates the second space K2 with the outside, but even if the ink 6 leaks from the rear end 5c of the ink tank 5a, the hole 4d is located forward of the rear end 5c of the ink tank 5a. Since the ink 6 is located at the rear shaft 4, the ink 6 easily flows toward the inside of the rear part of the rear shaft 4, and the structure is such that it is difficult to leak to the outside of the shaft body 2.

FIG. 2 is a longitudinal cross-sectional view showing a state in which the cap is attached to the front of the shaft body, with a portion shown in a side view. FIG. 3 is a partially enlarged view of the shaft.
As shown in the figure, a cap 8 is attached to the front shaft 3 to protect the ballpoint pen tip 5b. The cap 8 is provided with an annular protrusion 8b on the inner circumferential surface on the open end 8a side, and the annular protrusion 8b climbs over the protrusion 3e formed on the outer circumferential surface of the front shaft 3. is locked to the shaft 2, and at the same time, the ballpoint pen tip 5b comes into contact with an elastomer inner cap 8c provided on the cap 8, thereby preventing the ballpoint pen tip 5b from drying out.
In this embodiment, the rear shaft 4 is molded from polypropylene, which is a soft resin, and the cap 8 is molded from polycarbonate, which is a hard resin. Further, both the rear shaft 4 and the cap 8 are molded from transparent resin, so that the inside can be visually checked.
Further, in this embodiment, the cap 8 has a protrusion 8d on the inner peripheral surface on the open end 8a side, and the protrusion 8d slides on the outer peripheral surface of the shaft body 2 (rear shaft 4). It has a groove 2a. The rear wall of the spiral groove 2a has a plurality of recesses 21a, 22a, 23a that are recessed toward the rear, and the front wall of the spiral groove 2a has recesses 21a, 22a, 23a. When the protrusion 8d slides in the spiral groove 2a, the protrusion 8d has a pair of protrusions 24a, 25a, 26a that protrude toward the rear. , and is locked in the plurality of recesses 24a, 25a, and 26a in the spiral groove 2a.

Ink 6 was prepared by first collecting 20.0 parts by mass of a titanium oxide dispersion, 1.0 parts by mass of a solvent (ethylene glycol), 40.0 parts by mass of water, and 1.0 parts by mass of a dispersant (surfactant). After sufficient dispersion using a disperser, centrifugation is performed to remove coarse components to obtain a titanium oxide dispersion. Thereafter, 62.0 parts by mass of the prepared titanium oxide dispersion, 24.4 parts by mass of water, and 10 parts of the resin emulsion (acrylic emulsion) were added. 0 parts by mass, 1.0 parts by mass of phosphate ester surfactant, 1.0 parts by mass of pH adjuster (triethanolamine), 1.0 parts by mass of rust inhibitor (benzotriazole), 0.2 parts by mass of antifungal agent. A base ink was prepared by heating and stirring the mass part with a magnetic hot stirrer. Thereafter, while heating the base ink prepared above, 0.4 parts by mass of a shear thinning agent (succinoglycan) was added and thoroughly mixed and stirred using a homogenizer stirrer until a uniform state was obtained. Filtration was performed using filter paper to obtain white ink.

Next, a state in which the cap 8 is attached to the rear of the shaft body 2 and the ink 6 is pressurized will be described using FIGS. 4 to 6. FIG. 4 is a conceptual diagram showing the ballpoint pen of FIG. 1 in a first state in which the cap is attached to the rear of the shaft, and is in a non-pressurized state. FIG. 5 is a conceptual diagram showing a second state in which the cap is rotated and advanced from the state in FIG. 4, and is a state in which pressurization is started. FIG. 6 is a conceptual diagram showing a third state in which the cap is further rotated and advanced from the state in FIG. 5, and the ink is pressurized.

As shown in FIG. 4, the protrusion 8d of the cap 8 is aligned with the rear opening (not shown) of the spiral groove 2a of the shaft body 2, and the cap 8 is attached while being relatively rotated toward the rear of the shaft body 2. As a result, the protrusion 8d moves forward while sliding in the spiral groove 2a, and is urged by the rear convex portion 24a in the spiral groove 2a, as shown in FIG. It is locked in the rear recess 21a. At this time, the annular convex portion 8b of the cap 8 moves forward while slidingly contacting the outer circumferential surface of the shaft body 2, but the annular convex portion 8b slidingly contacting the outer circumferential surface of the shaft body 2 is placed above the spiral groove 2a. , the air inside the first space K1 and the second space K2 is not pressurized.

From the state of FIG. 4, by further rotating the cap 8 with respect to the shaft body 2, the protrusion 8d of the cap 8 moves forward while sliding in the spiral groove 2a, and the protrusion 8d of the cap 8 moves forward while sliding in the spiral groove 2a. As shown in FIG. 5, the convex portion 25a engages the intermediate concave portion 22a in the spiral groove 2a. At this time, the annular convex portion 8b of the cap 8 moves forward while slidingly contacting the outer circumferential surface of the shaft body 2, but since the protrusion 8d slidingly contacting the outer circumferential surface of the shaft body 2 passes over the hole 4d, The air inside the first space K1 and the second space K2 is not pressurized.

From the state shown in FIG. 5, by further rotating the cap 8 once with respect to the shaft body 2, the protrusion 8d of the cap 8 moves forward while sliding in the spiral groove 2a, and the protrusion 8d of the cap 8 moves forward while sliding in the spiral groove 2a. As shown in FIG. 6, the convex portion 26a engages the front concave portion 23a of the spiral groove 2a. At this time, the annular convex portion 8b of the cap 8 moves forward while slidingly contacting the outer peripheral surface of the shaft body 2, and communicates with the second space K2 through the hole 4d between the cap 8 and the shaft body 2. A gas storage part K3 is formed, and a sealed space MK is constituted by the first space part K1, the second space part K2, and the gas storage part K3.
As the cap 8 moves forward from the state shown in FIG. 5 to the state shown in FIG. The air inside the closed space MK constituted by the two-space part K2 and the gas storage part K3 is compressed, and the ink 6 is pressurized. In addition, in the ballpoint pen 1, since the compressive force of the air can be adjusted by rotating the cap 8, it is easy to finely adjust the pressing force of the ink 6.
In the ballpoint pen 1 of this embodiment, the length of the pitch of the spiral grooves 2a provided in the shaft body 2 is 4 mm, and the cap 8 from the state of FIG. 5 to the state of FIG. As it moves forward, the air in the closed space MK is compressed and the air pressure is increased to 1300 hPa.
Moreover, since the air in the closed space MK is compressed and the repulsive force exerts a force pushing the cap 6 backward, the protrusion 8d is firmly locked in the front recess 23a of the spiral groove 2a, and when writing Even if an impact is applied to the ballpoint pen 1, it is difficult to release the locked state.

In the ballpoint pen 1 of this embodiment, when the cap 8 is attached while being relatively rotated toward the rear of the shaft body 2, as shown in FIG. 22a is a state in which the annular bulging portion 8b of the cap 8 has passed forward of the hole 4d in the rear shaft 4, and is a state immediately before pressurization of the ink 6 is started. . Therefore, when the user rotates the cap 8, the user can feel that the projection 8d of the cap 8 is locked in the recess 22a, so that the user can know that pressurization of the ink 6 will start. As a result, it can be recognized in advance that the air in the closed space MK will be compressed, and that the repulsive force will make the rotation operation heavier.
On the other hand, from the state where the ink 6 is pressurized, the cap 8 is rotated in the opposite direction relative to the shaft body 2, and the protrusion 8d of the cap 8 is locked in the intermediate recess 22a in the spiral groove 2a. The user can recognize the state immediately before the pressurization of the ink 6 is released.
In this embodiment, from the state in which the protrusion 8d of the cap 8 shown in FIG. By being locked in the recess 23a of the cap 8, the cap 8 moves forward by 4 mm with respect to the shaft body 2 as described above, and the air pressure in the closed space MK is pressurized to 1300 hPa. The air in the closed space MK is gradually pressurized as the cap 8 moves forward with respect to the shaft body 2 even up to the front recess 23a. In other words, by providing a plurality of recesses between the intermediate recess 22a and the front recess 23a so that the protrusion 8d can be locked, it is possible to adjust the air pressure in the closed space MK in stages. Become.

Further, the pressure applied to the ink 6 changes depending on the amount of ink 6 stored in the ink tank 5a, and when there is a large amount of ink 6 and the first space K1 in the ink tank 5a is small, the pressure applied is large; When the amount of ink 6 is small and the first space K1 in the ink tank 5a is large, the pressing force tends to be small.
However, in the present embodiment, as described above, the air compressed when the cap 8 is attached to the shaft body 2 is airtight, which is formed by the first space K1, the second space K2, and the gas storage part K3. Since it is the entire air inside the space MK, the structure is not easily influenced by the first space K1 whose volume changes depending on the remaining amount of ink 6.
Specifically, in the state shown in FIG. 1 where the ink 6 in the ink tank 5a is unused, the volume of the first space K1 is 100 ^mm3 , and although not shown, when the ink 6 is small, the volume of the first space K1 is 100 mm3. The volume of one space K1 is 1400 mm ³ , and the ratio of volume change is large. On the other hand, in the state shown in FIG. 1 where ink 6 is unused, the volume of the closed space MK is 2100 mm ³ , and when there is only a small amount of ink 6 (not shown), the volume of the closed space MK is 3400 mm ³ . , the rate of volume change is small.
In fact, when the atmospheric pressure is 1000 hPa, the ballpoint pen 1 of this embodiment shown in FIG. 1 moves the cap 8 to the position shown in FIG. When installed at the rear, the air pressure in the closed space MK can be pressurized to 1300 hPa, and the cap 8 can be moved to the position shown in FIG. When attached to the rear, the air pressure in the closed space MK can be pressurized to 1200 hPa, and there is little change in the amount of pressurization.

By advancing the cap 8 from the state shown in FIG. 5 to the state shown in FIG. The air inside the closed space MK constituted by the two-space part K2 and the gas storage part K3 is compressed, and the ink 6 is pressurized. The rear shaft 4 of this embodiment is formed into a tapered shape having a gently arcuate surface whose diameter decreases toward the rear end. As a result, when attaching the cap 8 to the rear of the shaft body 2, the cap 8 can be easily moved to the position where the annular convex portion 8b of the cap 8 first comes into contact with the outer peripheral surface of the shaft body 2, that is, the position shown in FIG. 8 can be installed.
Further, as mentioned above, since the rear shaft 4 is made of soft resin, when the cap 8 is attached to the rear of the shaft body 4, the annular convex portion 8b of the cap 8 is formed on the outer periphery of the rear shaft 4. Since the cap 8 moves forward while pressing the surfaces and deforming it inward, the airtightness of the closed space MK becomes high, and even when the cap 8 moves forward and receives a strong repulsive force of the compressed air in the closed space MK, Since the contact resistance between the cap 8 and the shaft body 2 is increased, air can be compressed without the cap 8 falling off the shaft body 2.
Specifically, the inner diameter of the annular protrusion 8b of the cap 8 is 10 mm, and the outer diameter of the rear shaft 4 that the annular protrusion 8b abuts in FIG. 5 is 10.2 mm. The outer diameter of the rear shaft 4 on which the annular convex portion 8b abuts in FIG. 6, in which the air is compressed, is 10.4 mm, and the annular convex portion 8b is The difference in outer diameter of the tapered rear shaft 4 when moving forward is 0.2 mm.
The annular protrusion 8b provided on the inner circumferential surface of the cap 8 can be brought into close contact with the outer circumferential surface of the rear shaft 4 to efficiently maintain airtightness after compression has started. 8b is formed in a semicircular arc shape in cross section, and since it contacts the outer peripheral surface of the rear shaft 4 only at the innermost point, the annular convex portion 8b overcomes the hole portion 4d and pressurization is started. The situation changes significantly when the pressure is released.

1...Ballpoint pen (liquid discharge tool),
2... Shaft body (discharge tool main body), 2a... Spiral groove,
21a...rear recess, 22a...intermediate recess, 23a...front recess,
24a... Rear convex part, 25a... Intermediate convex part, 26a... Front convex part,
3...front shaft, 3a...front end opening, 3b...diameter reduction part, 3c...fitting part, 3d...press-fitting part, 3e...protrusion part,
4... Rear shaft, 4a... Rib, 4b... Fitting receiving part, 4c... Press-fitting receiving part, 4d... Hole part,
5... Ballpoint pen refill, 5a... Ink tank ( liquid storage tube ), 5b... Ballpoint pen tip (tip tip), 5c... Rear end part,
6...Ink (liquid),
7... Ink follower,
8... Cap, 8a... Opening end, 8b... Annular convex portion, 8c... Inner cap, 8d... Protrusion,
K1...first space part, K2...second space part, K3...gas storage part, MK...closed space.

Claims (6)

It comprises a cylindrical dispensing device main body, and a cap that is detachable from the front and rear of the dispensing device main body and has one end open and the other end closed,
A liquid dispensing tool for discharging a liquid stored inside the dispensing tool main body from a tip provided in front of the dispensing tool main body,
A liquid storage tube for storing the liquid is provided inside the discharge tool main body,
A first space portion located behind the liquid contained in the liquid storage tube is provided at a rear portion of the liquid storage tube,
having a second space communicating with the first space between the discharge tool main body and the liquid storage tube,
The inner circumferential surface of the cap on the open end side is in sliding contact with the outer circumferential surface of the dispensing tool main body,
having a protrusion on the outer circumferential surface of the dispensing device main body or the inner circumferential surface of the cap;
The inner peripheral surface of the cap or the outer peripheral surface of the dispensing device main body has a spiral groove in which the protrusion slides,
Aligning the protrusion with the spiral groove and attaching the cap while relatively rotating it toward the rear of the dispensing device main body,
While the protrusion slides in the spiral groove,
By moving forward while the inner circumferential surface of the cap on the open end side slides against the outer circumferential surface of the dispensing tool main body,
A liquid discharging device configured such that the liquid is pressurized via compressed air in a closed space formed by the first space and the second space. The liquid discharging tool according to claim 1,
The dispensing tool main body is provided with a hole communicating with the second space, and when the cap is attached to the rear of the dispensing tool main body, the hole is provided between the cap and the dispensing tool main body. a gas storage portion communicating with the second space portion is formed;
The liquid discharging tool has a structure in which the sealed space is constituted by the first space, the second space, and the gas storage part. The liquid ejection tool according to claim 1 or 2,
The liquid dispensing tool has a structure in which at least an outer circumferential surface of the dispensing tool main body is displaced in an axial radial direction when the cap is attached to the rear of the dispensing tool main body. The liquid discharging tool according to any one of claims 1 to 3,
A liquid dispensing device having a structure including an annular convex portion that slides on an outer circumferential surface of the dispensing device main body on an inner circumferential surface on an open end side of the cap. The liquid ejection tool according to any one of claims 1 to 4,
The cap has a protrusion on the inner circumferential surface, the dispensing tool body has a spiral groove on the outer circumferential surface in which the protrusion slides, and the rear wall of the spiral groove has a protrusion extending rearward. A liquid ejecting tool having a structure having a plurality of recessed portions, and when the projection slides in the spiral groove, the projection is locked in any one of the plurality of recesses in the spiral groove. The liquid discharging tool according to claim 5,
One of the plurality of recesses in the rear wall of the spiral groove is located at a position where pressurization of the liquid starts and a position where pressurization of the liquid is released with the protrusion of the cap locked. A liquid dispensing device with a structure that

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