JPH0726176U - Direct liquid writing instrument - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a direct liquid type writing instrument capable of enlarging the inner diameter of a barrel and having a long writable distance. In a direct liquid type writing instrument in which ink is directly filled in a shaft cylinder having a large inner diameter with a pen body arranged at the tip, a paste-like backflow preventer 6 is applied around the tail end side of the shaft cylinder 1. The columnar body 5 is sealed, and the ink I is filled in front of the columnar body 5 so that the columnar body 5 advances as the ink I is consumed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a direct liquid writing instrument in which ink is directly filled in a barrel having a pen body arranged at its tip.

[0002]

[Prior art]

 For example, a ballpoint pen that uses water-based ink has been put into practical use as a ball-point pen type in which ultrafine fibers are aligned and formed into a rod-shaped batting to absorb the ink and the batting is housed in a barrel. Writing instruments have the problem that the writable distance is short because there is a limit to the amount of ink that can be occluded, and the end points that make writing impossible due to exhaustion of ink are difficult to understand.

On the other hand, a direct liquid type writing instrument that directly fills the ink into the barrel and does not use batting has an advantage that the end point is clear and the writing distance is long because the ink can be directly observed. . In such a direct liquid writing instrument, when the air in the barrel becomes hot and expands, the ink is excessively ejected and drops off.Therefore, the excessively ejected ink is temporarily stored to prevent it from falling off. Many of the pen cores have a gas-liquid exchange function that introduces air into the barrel as ink is consumed. However, the pen core has a complicated structure and the number of parts is large.

For this reason, the tail end side of the shaft cylinder whose tail end communicates with the outside air is sealed with a paste-like backflow preventive body, and ink is filled in front of the backflow preventive body so that the pen body and the backflow preventive body are connected. It has been put into practical use that the gap is filled with ink only and the backflow preventer moves forward as the ink is consumed. In other words, the backflow preventer prevents the backflow of ink and prevents it from flowing out from the tail end opening of the barrel, but since there is only ink and no air in front of the backflow preventer, it becomes hot. The ink will not be pushed out by the expanded air.

[0005]

[Problems to be solved by the device]

 Even in such a direct liquid writing instrument, there is a great demand for increasing the writable distance, and it has been attempted to increase the inner volume of the barrel. However, when sealing the tail end side of the barrel with a paste-like backflow preventive, if the inner diameter of the barrel is increased, the sealing ability of this backflow preventer decreases, and when the writing implement falls on the floor, etc. Ink runs off from the rear end opening of the barrel. Therefore, in the case of a direct liquid type writing instrument in which the tail end side of the barrel is sealed with a paste-like backflow preventive body, the inner diameter of the barrel is at most 4 mmφ, and there is also a limit to the length of the writable distance. .

Therefore, an object of the present invention is to provide a direct liquid type writing instrument in which the inner diameter of the shaft cylinder can be increased and the writable distance is long.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention relates to a direct liquid type writing instrument in which ink is directly filled in a barrel having a large inner diameter with a pen body arranged at the tip, and the tail end side of the barrel is surrounded. Seal with a columnar body coated with a paste-like backflow preventive, and fill the ink in front of the columnar body so that the columnar body advances as ink is consumed.

[0008]

[Action]

 Since the tail end side of the barrel is sealed by a columnar body coated with a paste-like backflow preventive, the inner surface of the barrel can be increased even if the inner diameter of the barrel is increased to enable long-distance writing. Since the gap between the columnar body and the columnar body is narrow, and the narrow gap is sealed by the paste-like backflow preventer applied to the columnar body, it is strong against impact and ink does not flow out from the tail end opening of the barrel.

When the entire surface of the columnar body is covered with the backflow preventive, the backflow preventive body on the front surface of the columnar body flows out into the ink during use, and further, when the ink is filled, the ink is replenished with the columnar body. The backflow preventer may hit the backflow preventer on the front side of the column and may flow out into the ink.However, do not apply the backflow preventer to the front surface of the columnar body so that the front surface of the columnar body directly contacts the ink. Then, this problem can be solved.

Further, when the shaft cylinder is formed of a transparent material and a message for advertisement is formed on the outer peripheral surface of the columnar body, which is composed of characters or figures, the columnar body advances as ink is consumed. The position of the column moves, and it is possible to obtain a great advertisement effect with a lot of interest.Because the columnar body is not touched by your hands, etc., letters and figures may become thin or partially disappear, making it unsightly. Absent.

[0011]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. In Fig. 1, the shaft cylinder 1 is a cylinder body having an inner diameter of 7.0 mmφ which is injection-molded from a transparent synthetic resin, and has a larger inner diameter than that of the shaft cylinder of a conventional direct liquid writing instrument, and therefore a large amount of ink. Can be filled. Then, the tip 2 of the ballpoint pen is attached to the tip opening of the barrel 1.

The tip 2 is made of stainless steel in a cannonball shape, and is freely rotatable in a ball house at the tip of the tip 2 with a ball 3 made of cemented carbide protruding partially from the tip of the tip 2. Being hugged by. A spring 4 having a small spring force of, for example, 40 g is arranged in the chip 2, and the spring 4 repels the ball 3 to press it against the inward tip edge 21 of the chip 2 and And the leading edge 21 form the valve mechanism. The pen body is not limited to the ball-point pen tip 2, and may be, for example, a fiber tip formed by molding a fiber into a rod shape.

A tail plug 7 having an air hole 71 is fitted in the tail end opening of the barrel 1. A light columnar body 5 having a bottomed tubular shape is disposed inside the tail end side of the shaft cylinder 1. The columnar body 5 has, for example, an outer diameter of 6 mmφ and a length of 15 mm. Around the columnar body 5, a paste-like backflow preventing body 6 such as petrolatum is applied, and the backflow preventing body 6 fills the gap between the inner peripheral surface of the barrel 1 and the columnar body 5. . That is, the tail end side of the shaft cylinder 1 is sealed by the columnar body 5 around which the paste-like backflow preventing body 6 is applied.

Aqueous ink I having a viscosity of, for example, 30 to 40 cps is filled in the barrel 1 in front of the columnar body 5, and there is no air in the barrel 1 in front of the columnar body 5. When the ink I is consumed by writing, the columnar body 5 coated with the paste-like backflow preventive body 6 moves forward accordingly, but the inner diameter of the barrel 1 is large and the inner volume is large. Therefore, a large amount of ink I can be filled in the barrel 1, which has the advantage of a long writing distance.

Since the tail end side of the barrel 1 is sealed by the columnar body 5 to which the paste-like backflow preventive body 6 is applied, the barrel 1 has a large inner diameter. The gap between the inner peripheral surface of the shaft cylinder 1 and the columnar body 5 is narrow, and the paste-like backflow preventive body 6 applied to the columnar body 5 seals the narrow space, so that the amount of the backflow preventive body 6 is small. It has a strong impact resistance.

Incidentally, the direct liquid writing instrument of the present embodiment and the direct liquid writing instrument which is sealed only by the paste-like backflow preventing body 6 without using the columnar body 5 as the comparative example are respectively attached to the tail plugs 7. When the writing instrument of the comparative example was dropped downward from the height of 1 m and dropped naturally on the floor, the backflow preventer 6 completely flowed and lost the sealing function after five drops. It was confirmed that the backflow preventer 6 hardly moved even when dropped 10 times, had a perfect sealing function, and was resistant to impact.

Although FIG. 2 shows another embodiment, in the embodiment shown in FIG. 1, the backflow preventive body 6 is applied also to the front surface of the columnar body 5, whereas in this embodiment, The columnar body 5 has a flange portion 51 at its front portion, and the backflow preventer 6 is not applied to the front surface of the columnar body 5. That is, the ink I is in direct contact with the front surface of the columnar body 5. Therefore, the backflow preventer 6 hardly separates and flows out into the ink I during use, and further, when the ink I is filled in the barrel 1, the ink I is not deposited on the front surface of the columnar body 5. Even if it hits, there is an advantage that the backflow preventer 6 is not disturbed and flows out into the ink I.

Next, although FIG. 3 shows still another embodiment, a message for advertisement including characters and figures is written on the outer peripheral surface of the columnar body 5, and the barrel 1 is transparent. Therefore, it is necessary to be able to read this message. Since the columnar body 5 moves forward with the consumption of ink, the position of the message moves. Therefore, compared to the case where a message is written on the surface of the barrel 1, it is more entertaining and a large advertising effect can be obtained. Also, when a message is written on the surface of the barrel 1, the hand or the like touches it when writing, so characters and figures become thin or partly disappear, which makes it unsightly. Since these do not touch, these problems can be resolved.

[0019]

[Effect of device]

 As described above, the direct liquid type writing instrument of the present invention has the tail end side of the shaft cylinder sealed by the columnar body to which the past-like backflow preventive body is applied around, so that it has a sealing function even if an impact is applied. Therefore, the inner diameter of the barrel can be increased, and a direct liquid writing instrument with a long writing distance can be provided. In addition, if a message for advertisement, such as letters or figures, is placed on the outer peripheral surface of the columnar body, the columnar body moves, which makes the columnar body entertaining, and a large advertisement effect can be obtained.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of the invention of claim 1;

FIG. 2 is a sectional view of an embodiment of the invention of claim 2;

FIG. 3 is a front view of an embodiment of the invention of claim 3;

[Explanation of symbols]

 1 Shaft cylinder 2 Ballpoint pen tip 3 Ball 4 Spring 5 Columnar body 6 Backflow prevention body 7 Tail plug

Claims (3)

[Scope of utility model registration request] 1. A direct liquid type writing instrument in which ink is directly filled in a shaft cylinder having a large inner diameter, in which a pen body is arranged at the tip, wherein the tail end side of the shaft cylinder is paste-like backflow prevention around the periphery. A direct liquid writing instrument characterized in that a body is sealed by a coated columnar body, ink is filled in front of the columnar body, and the columnar body advances as ink is consumed. 2. The direct liquid writing instrument according to claim 1, wherein a backflow preventer is not applied to the front surface of the columnar body, and the front surface of the columnar body directly contacts the ink. 3. The direct writing instrument according to claim 1, wherein the barrel is formed of a transparent material, and a message composed of characters and figures is written on the outer peripheral surface of the columnar body.