JP2008162212A - Direct liquid type writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct liquid type writing utensil which can prevent its ink to stick on the inside surface of the end wall of the ink tank and be left over when the pen point is put either downward or sideways and the core of the ink tank is easily visually recognizable from the end wall side of the ink tank. <P>SOLUTION: This direct liquid type writing utensil 1 is so constructed to directly store the ink inside the ink tank 8 made of either transparent or translucent material and the core of the ink tank 8 can be visually recognizable from outside. The ink tank 8 forms a plurality of ribs or grooves on the inner surface of the end wall. At least one end of those ribs or grooves formed on the end wall of the ink tank 8 is extended to the side wall of the ink tank 8. The ribs or grooves extend outward in its radial directions from the center of the end wall of the ink tank 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 inside of 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 (bottom wall side of the ink tank).

Conventionally, in this type of direct liquid writing instrument, for example, Patent Document 1 discloses a configuration in which two or three ribs extending in the axial direction 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 ink tank is viewed from the bottom wall side in the pen tip downward state or the pen tip sideways state (the writing instrument is in a horizontal state), the ink adheres and remains on the inner surface of the bottom wall of the ink tank. , It may be difficult to visually recognize the inside of the ink tank. In particular, when an oil-based ink is employed as the ink stored in the ink tank, 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 avoids the ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank in the pen tip downward state or the pen tip sideways state, An object of the present invention is to provide a direct liquid writing instrument that can be easily seen from the bottom wall side of the tank.

The first invention of the present application is a direct liquid type writing instrument configured such that ink is directly stored in an ink tank 8 made of a transparent or translucent material, and the inside of the ink tank 8 is configured to be visible from the outside. A plurality of ribs or grooves are formed on the inner surface of the bottom wall of the ink tank 8.

The direct liquid writing instrument 1 according to the first invention has a plurality of ribs or grooves formed on the inner surface of the bottom wall of the ink tank 8, so that the ink pen 8 is placed in the ink tank 8 when the pen tip 2 is in a downward state or a lateral state. Is moved along a plurality of ribs or grooves on the inner surface of the bottom wall of the ink tank 8 to prevent ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8. It is easily visible from the bottom wall side.

According to a second invention of the present application, in the first invention, at least one end of a rib or a groove formed on the bottom wall of the ink tank 8 extends to the side wall of the ink tank 8.

In the direct liquid writing instrument 1 according to the second aspect of the present invention, when the pen tip 2 is in a downward state or a horizontal state, the ink in the ink tank 8 is quickly moved along the ribs or grooves on the inner surface of the bottom wall of the ink tank 8. Moving to the side wall of the ink tank 8 can prevent ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8. The ribs or grooves extend in the radial direction along the shape on the inner surface of the bottom wall of the ink tank 8.

The third invention of the present application is characterized in that, in the first or second invention, the ribs or grooves extend radially outward from the center of the bottom wall of the ink tank 8.

When the direct liquid writing instrument 1 according to the third aspect of the present invention is in the pen tip downward state or the pen tip sideways state, the ink in the ink tank 8 quickly moves from the bottom wall of the ink tank 8 toward the side wall of the ink tank 8. It is possible to prevent the ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8. The radially extending ribs or grooves may be formed at regular intervals or may not be formed at regular intervals.

According to a fourth invention of the present application, in the first, second, or third invention, a plurality of ribs or grooves extending in the axial direction are formed on the inner surface of the side wall of the ink tank 8, and the bottom wall of the ink tank 8 is formed. Each of the ribs or grooves on the inner surface is connected to the ribs or grooves on the inner surface of the side wall of the ink tank 8.

When the direct liquid writing instrument 1 according to the fourth aspect of the present invention is in a state where the pen tip faces downward, the ink in the ink tank 8 quickly moves along the ribs or grooves on the inner surface of the bottom wall of the ink tank 8. Then, the ink tank 8 can be rapidly moved downward along the ribs or grooves on the inner surface of the side wall of the ink tank 8 to reliably prevent the ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8.

According to a fifth aspect of the present invention, in any of the first to fourth aspects, a capillary groove is formed on the inner surface of the ink tank 8 by the rib or groove.

In the direct liquid writing instrument 1 according to the fifth invention of the present application, the ink contacting the inner surface of the ink tank 8 moves along the capillary groove, and the ink adhering to the inner surface of the ink tank 8 is collected in the capillary groove, and the capillary groove Ink does not adhere or remain on the inner surface of the ink tank 8 between the capillary groove and the capillary groove, and the inside of the ink tank 8 can be easily visually recognized from between the capillary groove and the capillary groove.

Further, the direct liquid writing instrument 1 according to the fifth invention of the present application has a configuration in which the capillary groove on the inner surface of the bottom wall of the ink tank 8 and the capillary groove on the inner surface of the side wall of the ink tank 8 are connected (or the ink tank 8 The ribs or grooves on the inner surface of the bottom wall of the ink tank 8 are connected to the ribs or grooves on the inner surface of the side wall of the ink tank 8 so that the capillary groove on the inner surface of the bottom wall of the ink tank 8 and the capillary groove on the inner surface of the side wall of the ink tank 8 In the case of a connected configuration), when the pen tip is in a downward state, the ink in the ink tank 8 quickly moves along the capillary groove (rib or groove) on the inner surface of the bottom wall of the ink tank 8 toward the side wall of the ink tank 8. Then, the ink tank 8 is quickly moved downward along the capillary groove (rib or groove) on the inner surface of the side wall of the ink tank 8 to reliably prevent the ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8. .

In the fifth aspect of the present invention, the capillary groove is formed by adjacent ribs when the ribs are formed on the inner surface of the ink tank 8, or a connecting corner between the ribs and the inner surface of the ink tank 8. Formed in the part. When a groove is formed on the inner surface of the ink tank 8, the groove formed on the inner surface of the bottom wall of the ink tank 8 becomes a capillary groove. The inner surface of the ink tank 8 refers to both the inner surface of the bottom wall of the ink tank 8 and the inner surface of the side wall of the ink tank 8.

The sixth invention of the present application is characterized in that, in any one of the first to fifth inventions, the ink stored in the ink tank 8 is an oil-based ink containing an organic solvent as a main solvent.

The oil-based ink generally has a low surface tension and is likely to adhere and remain on the inner surface of the ink tank 8, but the direct liquid writing instrument 1 according to the sixth aspect of the invention is the first, second, third, fourth, or second Combined with the invention of No. 5, a direct liquid writing instrument containing oil-based ink that can be easily visually recognized in the ink tank 8 is obtained.

The direct liquid writing instrument of the present invention avoids ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank in the pen tip downward state or the pen tip sideways state. Visible easily.

Embodiments of the direct liquid writing instrument 1 of the present invention are 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 (specifically two) of 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 the front surface of the partition wall 71 or And a mounting cylinder portion 74 that protrudes from the rear surface 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 portion 74 surrounds the outer periphery of the rear end portion of the communication pipe 72 or the outer periphery of the base portion of the connection 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). Ink is directly stored (accommodated) 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 stored in the ink tank 8, an oil-based ink (that is, an oil-based ink for writing instruments or an oil-based coating liquid) having an organic solvent as a main solvent or a water-based ink having water 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 On the inner surface of the bottom wall of the ink tank 8, a plurality of (specifically, twelve) ribs 81 extending radially outward from the central portion are integrally formed at regular intervals. A capillary groove 81a having a V-shaped cross section extending in the axial direction is formed at a connection corner between each rib 81 and the inner wall of the ink tank 8. An inner surface of the bottom wall of the planar ink tank 8 having the capillary grooves 81a on both sides is formed between the ribs 81 and the ribs 81, respectively. The plurality of radially extending ribs 81 may not be formed at regular intervals.

The height in the radial direction of each rib 81 on the inner surface of the bottom wall of the ink tank is set to 0.4 mm. The thickness of each rib 81 (the distance between the capillary groove 81a on both sides of each rib 81 and the capillary groove 81a) is set to 0.7 mm. The angle formed by both side walls of each rib 81 on the inner surface of the bottom wall of the ink tank 8 is set to 50 degrees. The top of each rib 81 on the inner surface of the bottom wall of the ink tank 8 has an R curved surface. (See Figure 5)

A plurality of (specifically, twelve) ribs 82 extending in the axial direction are integrally formed at equal intervals on the inner surface of the rear side wall of the ink tank 8. A capillary groove 82a having a V-shaped cross section extending in the axial direction is formed at the connecting corner between each rib 82 and the inner surface of the side wall of the ink tank 8. An inner wall of the ink tank 8 having a circumferential surface having the capillary groove 82a on both sides is formed between the ribs 82 and 82, respectively. Each of the circumferential widths of the inner wall of the ink tank 8 having a circumferential surface between the ribs 82 is set to 3 mm. Each of the ribs 82 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 radial height of each rib 82 on the inner surface of the side wall of the ink tank 8 is set to 0.4 mm. The thickness of each rib 82 on the inner surface of the side wall of the ink tank 8 (the distance between the capillary groove 82a on both sides of each rib 82 and the capillary groove 82a) is set to 0.7 mm. An angle formed by both side walls of each rib 82 on the inner surface of the side wall of the ink tank 8 is set to 50 degrees. The top of each rib 82 has an R curved surface. The inner diameter of the portion having the rib 82 on the side wall of the ink tank 8 is set to 13 mm to 15 mm. (See Figure 6)

Each of the radial ribs 81 on the inner surface of the bottom wall of the ink tank 8 is connected to a plurality of axially extending ribs 82 projecting from the inner surface of the side wall of the ink tank 8 (connected integrally). That is, the capillary groove 81a on the inner surface of the bottom wall of the ink tank 8 and the capillary groove 82a on the inner surface of the side wall of the ink tank 8 are connected. In the present embodiment, the number of the radial ribs 81 and the number of the axial ribs 82 are the same. In addition to this, the number of the radial ribs 81 and the number of the axial ribs 82 may not coincide with each other, and at least the radially outer end portions of the radial ribs 81 extend in the axial direction. It is only necessary to be connected to a plurality of ribs 82.

When the direct liquid writing instrument 1 of the present embodiment is placed in the pen tip downward state or the pen tip lateral state, the ink in the ink tank 8 is collected in the rib 81 (capillary groove 81a) on the inner surface of the bottom wall of the ink tank 8. The ink tank 8 moves outward in the radial direction, and then descends along the rib 82 (capillary groove 82 a) on the inner surface of the side wall of the ink tank 8. Therefore, it is possible to prevent ink from adhering to and remaining on the inner surface of the bottom wall of the ink tank 8, and the inside of the ink tank 8 can be easily passed from the bottom wall side of the ink tank 8 through the transparent or translucent shaft cylinder 4 (rear shaft 6). The remaining amount of ink in the ink tank 8 can be easily confirmed.

In the present invention, the shape of the inner surface of the bottom wall of the ink tank 8 may be any of a planar shape (FIG. 2), a conical concave surface shape, a conical convex surface shape, a concave curved surface shape, and a convex curved surface shape.

It is a longitudinal cross-sectional view which shows the direct liquid type writing instrument of 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. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 2. FIG. 3 is an enlarged cross-sectional view of a main part of a rib on an inner surface of the ink tank bottom wall of FIG. 2. FIG. 3 is an enlarged cross-sectional view of a main part of a rib on the inner surface of the ink tank side wall in FIG. 2.

Explanation of symbols

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 81a Capillary groove 82 rib 82a capillary groove 9 plug body

Claims (6)

A direct liquid type writing instrument configured to store ink directly in an ink tank made of a transparent or translucent material, and to make the inside of the ink tank visible from the outside. A direct liquid-type writing instrument, wherein ribs or grooves are formed. 2. The direct liquid writing instrument according to claim 1, wherein at least one end of a rib or groove formed on the bottom wall of the ink tank extends to the side wall of the ink tank. The direct liquid writing instrument according to claim 1 or 2, wherein the ribs or grooves extend radially outward from the center of the bottom wall of the ink tank. A plurality of ribs or grooves extending in the axial direction are formed on the inner surface of the side wall of the ink tank, and each of the ribs or grooves on the inner surface of the bottom wall of the ink tank is connected to the rib or groove on the inner surface of the side wall of the ink tank. The direct liquid writing instrument according to claim 1, 2 or 3. The direct liquid writing instrument according to any one of claims 1 to 4, wherein a capillary groove is formed on an inner surface of the ink tank by the rib or the groove. The direct liquid writing instrument according to any one of claims 1 to 5, wherein the ink stored in the ink tank is an oil-based ink containing an organic solvent as a main solvent.

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