JP4980047B2 - Direct liquid writing instrument - Google Patents

Description

The present invention relates to a direct liquid writing instrument in which ink is directly stored in an ink tank made of a transparent or translucent material so that the ink in the ink tank is visible from the outside. In the present invention, “front” refers to the pen tip side, and “rear” refers to the ink tank side.

Conventionally, in this type of direct liquid writing instrument, for example, Patent Document 1 discloses a configuration in which two or three ribs are provided on the inner surface of an ink tank.
Utility Model Registration No. 2593672

In the conventional direct liquid type writing instrument, when the pen tip is in an upward state or a downward direction, the ink does not descend rapidly along the inner wall of the ink tank, and the ink tank has a circumferential surface between the ribs. Ink remains on the inner wall, and it may be difficult to check the remaining amount of ink in the ink tank from the outside. In particular, when an oil-based ink is employed as the ink, the oil-based ink generally has a low surface tension and tends to remain on the inner wall of the ink tank.

The present invention solves the above-mentioned conventional problems, and when the pen tip is in the upward state or the downward direction of the pen point, almost no ink remains on the inner wall of the ink tank between the ribs. It is an object of the present invention to provide a direct liquid writing instrument in which the remaining ink amount can be easily visually recognized from the outside.

1st invention of this application stores ink directly in the inside of the ink tank 8 which consists of a transparent or translucent material, and the several rib 81 extended in an axial direction is formed in the inner wall of the said ink tank 8, and the said is formed. A direct liquid type writing instrument configured such that the ink in the ink tank 8 can be visually recognized from the outside, wherein a capillary groove 82 extending in the axial direction is formed at a connecting corner between each rib 81 and the inner wall of the ink tank 8, The circumferential width W of the inner wall of the ink tank 8 having a capillary groove 82 on both sides and between the rib 81 and the rib 81 is set to 2 mm to 5 mm, and the rib 81 of the ink tank 8 is It is a requirement that the inner diameter D of the portion to be included is 12 mm or more, and the ink accommodated in the ink tank 8 is an oil-based ink containing an organic solvent as a main solvent .

The direct liquid writing instrument 1 of the first invention is formed with a capillary groove 82 extending in the axial direction at a connecting corner between each rib 81 and the inner wall of the ink tank 8, and the capillary groove 82 is provided on both sides. By setting the circumferential width W of the inner circumferential wall of the ink tank 8 between the rib 81 and the rib 81 to 2 mm to 5 mm, the ink tank can be used when the nib 2 is in the upward or downward state. The ink in the ink 8 descends along the capillary groove 82, and the ink adhering to the inner wall of the circumferential ink tank 8 between the rib 81 and the rib 81 is drawn toward the rib 81 by the capillary grooves 82 on both sides. The ink is quickly removed from the inner wall of the circumferential ink tank 8 between the rib 81 and the rib 81, and the ink passes through the inner wall of the circumferential ink tank 8 between the rib 81 and the rib 81. In tank 8 The key remaining amount can be easily visually recognized.

When the circumferential width W of the inner wall of the ink tank 8 having a circumferential surface between the ribs 81 is smaller than 2 mm (millimeters), the number of the ribs 81 becomes excessively large and the remaining ink amount is reduced. Since the area of the inner wall of the ink tank 8 having a circumferential surface between the ribs 81 for visual recognition is reduced, the visibility of the remaining amount of ink from the outside is reduced. On the contrary, when the circumferential width W of the inner wall of the ink tank 8 having a circumferential surface between the ribs 81 is larger than 5 mm (millimeters), when the nib 2 is in an upward state or a downward state, In the same manner as described above, the ink tends to remain on the inner wall of the circumferential ink tank 8 between the ribs 81, and it is difficult to visually recognize the remaining amount of ink in the ink tank 8 from the outside.

The circumferential thickness T of the rib 81 is preferably 1 mm or less, whereby the total area of the inner wall of the circumferential ink tank 8 between the ribs 81 can be made as large as possible, which is advantageous in improving ink visibility. Become. The height H in the radial direction of the rib 81 is preferably 1 mm or less, so that the rib 81 can be made inconspicuous from the outside.

The first invention of the present application is a requirement that the internal diameter D of the portion having the rib 81 before Symbol ink tank 8 is 12mm or more. In the direct liquid writing instrument according to the first aspect of the present invention, when the ink tank 8 is viewed from the outside, the inner wall of the circumferential ink tank 8 between the ribs 81 that is visible is increased, so that the ink residue can be more easily maintained. The amount can be visually confirmed. The inner diameter D of the portion having the rib 81 of the ink tank 8 is measured at the portion excluding the rib 81.

In the direct liquid writing instrument 1, the number of the ribs 81 is preferably set to 10 to 15 in order to satisfy the configuration 1 and the configuration 2 at the same time.

The first invention of the present application is ink accommodated before Symbol in the ink tank 8 is a requirement that the oil-based ink using an organic solvent as a main solvent. The oil-based ink generally has a low surface tension and is likely to remain on the inner wall of the circumferential ink tank 8 between the rib 81 and the rib 81. Combined with the first aspect of the invention, a direct liquid writing instrument containing oil-based ink in which the remaining amount of ink can be easily visually recognized.

According to a second invention of the present application, in the first invention, a plurality of radially extending ribs 83 project from the bottom of the inner wall of the ink tank 8, and the radial ribs 83 and the ribs 81 extending in the axial direction are provided. It is a requirement to be connected.

In the direct liquid writing instrument of the second invention, when the pen tip is in a downward state, the ink attached to the bottom of the inner wall of the ink tank 8 moves radially outward along the radial ribs 83 on the bottom, Furthermore, since it descends along the rib 81 extending in the axial direction, it is possible to avoid ink remaining at the bottom of the ink tank 8, and the visibility of the remaining amount of ink is improved. The bottom of the inner wall of the ink tank 8 refers to the closed side of the rear end of the inner wall of the ink tank 8.

When the direct liquid type writing instrument of the present invention is in the pen tip upward state or the pen tip downward state, almost no ink remains on the inner wall of the ink tank between the ribs, and the ink remaining amount in the ink tank is externally increased. Easy to see.

(First embodiment)
A first embodiment of the direct liquid writing instrument 1 of the present invention is shown in FIGS.
The direct liquid writing instrument 1 of the present embodiment includes a pen tip 2, an ink occlusion body 3 connected to the rear end of the pen nib 2, an intermediate member 7 disposed behind the ink occlusion body 3, and An ink tank 8 that is replaceably disposed behind the intermediate member 7, and holds the pen nib 2 at the front end portion, and includes the ink occlusion body 3, the intermediate member 7, and the ink tank 8 inside. And a shaft cylinder 4 for housing the housing.

Pen nib The nib 2 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The front end of the nib 2 is ground like a bullet. The outer peripheral surface of the rear end portion of the nib 2 is chamfered in a tapered shape.

Ink occlusion body The ink occlusion body 3 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The rear end of the pen tip 2 is inserted into the axial center of the front end surface of the ink storage member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 3. The ink occlusion body 3 is an ink storage member that is disposed between the nib 2 and the ink tank 8 and temporarily holds the overflow ink corresponding to the increase in the internal pressure of the ink tank 8. In the present invention, instead of providing the ink occlusion body 3, comb-like ink that temporarily holds overflow ink corresponding to an increase in the internal pressure of the ink tank 8 between the nib 2 and the ink tank 8. A retaining member may be provided.

The shaft cylinder 4 includes a front shaft 5 and a rear shaft 6 that is detachably screwed into a rear end opening of the front shaft 5. The front shaft 5 and the rear shaft 6 are both It is a cylindrical body obtained by injection molding of synthetic resin (for example, polypropylene, polyethylene, etc.).

The front shaft 5 has a taper that holds the outer peripheral surface of the nib 2, and a main body that is connected to the rear of the taper and accommodates the ink occlusion body 3, the partition wall 71, and the front part of the ink tank 8. Consists of.

Rear shaft The rear shaft 6 is a bottomed cylindrical body having a front end opened and a rear end closed, and the front end opening of the rear shaft 6 is screwed to the rear end opening of the front shaft 5. Then, the rear part of the ink tank 8 is accommodated in the rear shaft 6. The rear shaft 6 is obtained by injection molding of a transparent or translucent synthetic resin (for example, polypropylene). The ink tank 8 (that is, the rear portion of the ink tank 8) can be visually recognized from the outside through the rear shaft 6.

When the ink tank 8 is replaced, the rear shaft 6 is removed by loosening the screwed state from the rear end of the front shaft 5, and after the ink tank 8 is removed, a new ink tank 8 is inserted into the front shaft 5. Then, the rear shaft 6 is screwed into the rear end portion of the front shaft 5 again. In the process of screwing the rear shaft 6 and the rear end portion of the front shaft 5, the rear end of the ink tank 8 contacts the inner surface of the rear end wall of the rear shaft 6, and the rear shaft 6 and the front shaft 5 are screwed together. As a result, the ink tank 8 is pressed into the shaft cylinder 4, and the front end opening of the ink tank 8 is opened.

Intermediate member The intermediate member 7 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 7 protrudes forward from the front surface of the partition wall 71 and partitions the ink storage body accommodating portion and the ink tank 8 in the shaft cylinder 4 and is pierced and connected to the inside of the ink storage body 3. A plurality of (specifically, two) communication pipes 72, a connection pipe 73 protruding rearward from the rear surface of the partition wall 71 and inserted into the front end opening of the ink tank 8, and And an attachment cylinder portion 74 that protrudes rearward and is fixed to the inner surface of the shaft tube 4 (the inner surface of the main body portion 52). The ink occlusion body 3 is accommodated in a space formed by the shaft cylinder 4 and the partition wall 71 (that is, the occlusion body accommodation portion). The mounting cylinder 74 surrounds the outer periphery of the base of the communication pipe 72 or the outer periphery of the base of the connecting pipe 73. The connecting pipe 73 is integrally formed with a projecting piece 73a for pressing one side of the plug body 9. The partition wall 71 has a disk shape, and each of the communication pipe 72, the connection pipe 73, and the attachment cylinder portion 74 have a cylindrical shape.

In the intermediate member 7, the partition wall 71, the communication pipe 72, the connection pipe 73, and the attachment cylinder portion 74 are integrally connected (that is, formed integrally). In other words, the partition member 71, the communication pipe 72, the connection pipe 73, and the mounting cylinder portion 74 can be configured with one component by the intermediate member 7.

A flow passage 72 a is provided in the inside of each of the communication pipes 72 in the axial direction, and the flow passage 72 a is opened at both ends of each of the communication pipes 72. A front end of each of the communication pipes 72 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 72 is opened in the ink tank 8 behind the rear end of the partition wall 71. Since each of the communication pipes 72 is arranged in parallel between the ink storage body 3 and the ink tank 8, a plurality of independent circulations are provided between the ink storage body 3 and the ink tank 8 behind the ink storage body 3. A path 72a is provided in parallel.

Ink tank The ink tank 8 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a transparent or translucent synthetic resin (for example, polypropylene). The inner diameter D of the portion having the rib 81 of the ink tank 8 is set to 13 mm to 15 mm. Ink is directly stored in the ink tank 8. As the ink stored in the ink tank 8, a writing instrument ink or a coating liquid (for example, a cosmetic liquid, a correction liquid, an adhesive, a paint, a liquid medicine, etc.) is appropriately employed. As the ink, an oil-based ink (that is, an oil-based ink for a writing instrument or an oil-based coating liquid ) containing an organic solvent as a main solvent is employed. Before opening, the stopper 9 is fitted in the front end opening of the ink tank 8, and the ink tank 8 is closed. Here, as the plug body 9, a disk-shaped plug body 9 made of a synthetic resin (for example, polypropylene) injection-molded body is employed. A spherical plug body 9 may be employed instead of the disk-shaped plug body 9.

The outer surface of the connecting pipe 73 of the intermediate member 7 is detachably fitted to the inner surface of the front end opening of the ink tank 8. When ink in the ink tank 8 is consumed and writing becomes impossible, the ink tank 8 is removed from the connection pipe 73 and the connection pipe 73 is inserted into the front end opening of a new ink tank 8 filled with ink. To do. Thereby, writing becomes possible again. The front end opening of the new ink tank 8 is closed by a stopper 9. When the connecting pipe 73 is inserted into the front end opening of the ink tank 8, the plug body 9 is pushed backward by the projecting piece 73 a of the connecting pipe 73, whereby the plug body 9 is removed and the front end of the ink tank 8 is removed. The opening is opened.

Ribs A plurality of (specifically, twelve) ribs 81 extending in the axial direction are integrally formed at equal intervals on the rear inner wall of the ink tank 8. A capillary groove 82 having a V-shaped cross section extending in the axial direction is formed at a connecting corner between each rib 81 and the inner wall of the ink tank 8. An inner wall of the ink tank 8 having a circumferential surface having the capillary grooves 82 on both sides in the circumferential direction is formed between the ribs 81 and the ribs 81. Each of the circumferential widths W of the inner wall of the ink tank 8 having a circumferential surface between the ribs 81 is set to 3 mm. Each of the ribs 81 is formed at least in the region of the rear end portion of the ink tank 8 that is visible from the outside through the rear shaft 6.

The height H of each rib 81 in the radial direction is set to 0.4 mm. The thickness T of each rib 81 in the circumferential direction is set to 0.7 mm. The angle α formed by the side walls of each rib 81 is set to 50 degrees. The top of each rib 81 has an R curved surface.

When the direct liquid writing instrument 1 according to the present embodiment is set to the pen tip upward state or the pen tip downward state when visually confirming the ink remaining amount, the ink in the ink tank 8 is collected in the capillary groove 82 on the inner wall of the ink tank 8. It descends while being. Therefore, the ink adhering to the inner wall of the circumferential ink tank 8 between the rib 81 and the rib 81 can be quickly removed, and through the inner wall of the circumferential ink tank 8 between the rib 81 and the rear shaft 6, The remaining amount of ink in the ink tank 8 can be easily visually recognized from the outside.

(Second Embodiment)
A second embodiment of the direct liquid writing instrument 1 of the present invention is shown in FIGS.
A plurality of (specifically, twelve) ribs 83 that extend radially outward from the center of the ink tank 8 are integrally formed on the inner wall of the bottom of the ink tank 8 (the inner surface of the rear end wall of the ink tank 8). Protrusions are formed. Capillary grooves having a V-shaped cross section extending radially outward are formed at the connecting corners between the radially extending ribs 83 and the bottom inner wall of the ink tank 8. Each of the radial ribs 83 is connected to a plurality of axially extending ribs 81 projecting from the inner wall of the ink tank 8 (integrally connected). Thereby, each of the radial capillary grooves on the inner wall of the bottom of the ink tank 8 is connected to the capillary groove 82 extending in the axial direction of the inner wall of the ink tank 8. In the present embodiment, the number of the radial ribs 83 and the number of the ribs 81 in the axial direction are the same. In addition to this, the number of the radial ribs 83 and the number of the axial ribs 81 may not coincide with each other, and at least a plurality of radial outer end portions of the radial ribs 83 extend in the axial direction. It is only necessary to be connected to the rib 81.

The bottom of the inner wall of the ink tank 8 of the first embodiment is substantially flat. For this reason, when the pen tip is in the downward state, the ink tends to adhere and remain on the bottom of the inner wall of the ink tank 8. However, even though the bottom of the inner wall of the ink tank 8 of the second embodiment is substantially planar, the radial tip 83 connected to the axial rib 81 is formed, so that the pen tip is in a downward state. In this case, it is possible to prevent ink from adhering to and remaining on the bottom of the inner wall of the ink tank 8, and the inside of the ink tank 8 can be easily visually recognized from the bottom side of the ink tank 8.

The cross-sectional shape of each of the radial ribs 83 is the same as the cross-sectional shape of each of the axial ribs 81 described in the first embodiment (see FIG. 4).

Since the other configuration of the second embodiment is the same as that of the first embodiment, description thereof is omitted.

It is a longitudinal cross-sectional view which shows the direct liquid type writing instrument of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the ink tank of the plugged state of FIG. It is the sectional view on the AA line of FIG. It is a principal part expanded sectional view of FIG. It is a longitudinal cross-sectional view which shows the direct liquid type writing instrument of the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the ink tank in the closed state of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG.

DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 3 Ink occlusion body 4 Shaft cylinder 5 Front shaft 6 Rear shaft 7 Intermediate member 71 Bulkhead 72 Communication pipe 72a Flow path 73 Connection pipe 73a Projection piece 74 Installation cylinder part 8 Ink tank 81 Rib 82 Capillary groove 83 Rib 9 Plug body W Circumferential width D of the inner wall of the ink tank between the ribs in the circumferential direction D Inner diameter of the portion of the ink tank having the rib H Radial height of the rib T Thickness of the rib in the circumferential direction α Angle between both side walls of rib

Claims (2)

Ink is stored directly in the inside of an ink tank made of transparent or translucent material, and multiple ribs extending in the axial direction are formed on the inner wall of the ink tank so that the ink in the ink tank can be seen from the outside. A direct liquid type writing instrument configured, wherein a capillary groove extending in an axial direction is formed at a connection corner between each of the ribs and the inner wall of the ink tank, and the capillary groove is provided on both sides, between the ribs. The circumferential width of the inner wall of the ink tank of the circumferential surface is set to 2 mm to 5 mm, the inner diameter of the portion having the rib of the ink tank is 12 mm or more, and the ink accommodated in the ink tank contains an organic solvent. Direct liquid type writing instrument characterized by being an oil-based ink as a main solvent . A plurality of ribs extending radially on the bottom of the ink tank inner wall is protruded, formed by connecting the ribs extending in the axial direction and the radial ribs claim 1 direct liquid type writing instrument according.

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