JPH0664961U - Writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] By providing an air circulating means extending from the inside of the cap to the inside of the barrel, and by providing a seal member for a writing part at a portion inside the cap near the opening edge apart from the top of the cap, An object of the present invention is to provide a writing instrument capable of preventing air from directly flowing into the ink containing tube from the writing section and preventing ink from being blown out due to the sealing inside the cap. [Structure] A desired communication hole 10 is formed between the outer surface of a joint 9 and the inner surface of a tip metal 12, and the communication hole 10 is formed into a tip 1a of a barrel 1.
And the lower surface 11 of the flange cylinder portion 9c, the cap 1 is connected to the air circulation gap b formed between the outer surface of the ink containing tube 6 and the inner surface of the shaft cylinder 1 through the communication portion 4.
The internal pressures of the internal space c of 5 and the inside of the barrel 1 are made the same, and a sealing material 16 made of an independent foam or the like is provided inside the cap 15 to prevent the ink from blowing from the writing portion 8 due to a temperature rise. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, an ink containing tube having a writing section is fitted in a barrel, a tip is screwed onto the tip of the barrel, and a cap is fitted over the tip of the barrel to insert the above-mentioned writing section and tip. The present invention relates to an improvement of a writing instrument that shields gold from the outside with a cap, and more particularly to a writing instrument having an improved air inflow prevention structure that prevents air from flowing into an ink containing tube in this type of writing instrument.

[0002]

[Prior art]

 In a writing instrument with a structure in which the writing instrument is sealed with a cap, the pressure inside the cap increases due to the sealing, and the air in the cap does not escape, so the writing part (pen tip or between the nib and the nib holder There is a possibility that the ink may flow into the ink containing tube through a gap), and as a means for solving this, there is a conventional one described in, for example, Japanese Utility Model Publication No. 61-39592, which allows the side wall of the cap to be partially opened. With this structure, it was possible to prevent an increase in the internal pressure of the cap, which served as a means for preventing the inflow of air. In the prior art described in this publication, air always flows through the cap, so it is necessary to devise to prevent the writing part from drying.For that reason, the sealing material that the writing part contacts when the cap is fitted is attached to the top of the cap. It is provided on the inner surface.

[0003]

[Problems to be solved by the device]

 The ink drying prevention means of the writing part in the writing instrument using the open-type cap like the prior art described in the above publication is provided with a sealing material in a part inside the cap which is as close as possible to the opening edge opposite to the cap top part. It is preferable to seal the writing part as soon as possible when fitted, but in the prior art described in the above publication, the cap side wall is configured to be open, so a sealing material should be provided at a part inside the cap that is as close as possible to the opening edge of the cap. However, the sealing material is unavoidably provided on the inner surface of the cap top.Since the sealing material is located deep inside the cap, the writing part can be quickly sealed when the cap is fitted. There was difficulty.

Therefore, as a result of intensive research conducted by the present inventor focusing on the above-mentioned two conventional techniques, as a result of adjusting the internal pressure between the inside of the cap and the barrel of the writing instrument that seals the inside of the cap by cap fitting. We have succeeded in developing a structure that can do this. Therefore, the present invention has been made in view of the above problems of the above two prior arts, and an object of the present invention is to provide a writing instrument that seals the inside of a cap by fitting a cap into the shaft cylinder. By providing a means for circulating air into the inside of the cap, and by providing a sealant for the writing part near the opening edge away from the top of the cap, the air directly flows from the writing part into the ink containing tube. The present invention is to provide a writing instrument capable of preventing the ink from being blown out due to the sealing of the cap.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the technical means made by the present invention is to attach a writing part via a joint to the tip of an ink containing tube filled with liquid ink and backflow prevention, and to install the ink containing tube in the barrel. An air flow gap is formed on the end of the barrel, and the tip is screwed onto the tip of the barrel to conceal the joint, and the writing part is projected from the tip of the tip. An air flow passage is formed between the gold and the air flow passage, and the air flow passage is communicated with the air flow gap, and a sealant for a writing portion is provided at a position apart from the top of the cap fitted on the tip of the shaft cylinder. In addition to the above, the shaft cylinder, the tip metal, or the cap is provided with the writing portion and the seal portion for blocking the tip metal from the outside.

Further, the joint may be provided with a communication portion that connects the air flow passage and the air circulation gap.

Further, a communication portion that connects the air flow passage and the air circulation gap may be provided at the tip of the barrel.

Further, the air flow passage and the air circulation gap may be connected to each other by the flow hole provided in the joint and the communication portion provided at the tip of the barrel.

[0009]

[Action]

 With the above technical means, when the cap is fitted, the air in the cap does not flow directly from the writing section to the ink storage tube, but rather the air flow path between the writing section and the joint and the tip metal → the flow hole → Adjust the internal pressure between the cap and the barrel because it flows in the communication part → the air circulation gap in the barrel or in the order of air flow path → communication part → air circulation to the rear end of the ink containing pipe. Can be achieved.

Since the sealing material in the cap is provided at a position away from the top of the cap, the sealing material begins to come into contact with the writing part from an early point in the unsealed state in the cap due to the incomplete fitting of the cap, and then from the writing part. To prevent air from directly flowing into the ink storage tube from an early stage, when the cap is completely sealed and the inside of the cap is sealed, it is pressed by the writing part and completely seals the writing part. Of the sealing material that prevents the air from directly flowing into the ink containing tube from the ink jet section and presses the writing section even if the liquid ink in the ink containing tube expands due to the rise in the temperature inside the cap or the ink containing tube. This prevents ink from being ejected from the pen tip.

[0011]

【Example】

 An embodiment of the present invention will be described below.

In the drawing, A shows a writing instrument of the present invention, which is composed of a barrel 1, an ink containing tube 6, a writing part 8, a joint 9, a tip 12, and a cap 15. It should be noted that the writing instrument A shown in the present embodiment is not limited to one embodiment and is not limited in any way and is arbitrary and can be appropriately changed.

The shaft cylinder 1 is configured by engraving a male screw portion 3 on the outer peripheral surface of the tip 1a, and providing a communicating portion 4 on the edge portion of the tip 1a, and a sealing plug 5 at the rear end 1b. Is installed. Incidentally, the cylinder diameter of the shaft cylinder 1, the overall length and the like can be appropriately changed and are arbitrary.

The communicating portion 4 is for communicating with the lower surface 11 of the flange tubular portion 9c of the joint 9 with which the tip 1a of the shaft tube 1 is in pressure contact, and is provided by cutting out from the upper surface 1a 'of the tip 1a. The cutout area has a short length and can be set appropriately. Further, in the drawing, the cutout is provided from the upper surface 1a ', but the present invention is not limited to this, and a hole (an arbitrary shape such as a perfect circle, an ellipse or a polygon) having a desired size is formed on the side surface of the tip 1a. It may be provided afterwards.

The ink containing tube 6 is formed to have a diameter such that an air flow gap b can be formed between the ink containing tube 6 and the inner surface of the barrel 1 when fitted to the barrel 1, and the rear end 6 a of the liquid ink The backflow stop 7 is filled, and the joint 9 is fitted to the tip 6b to dispose the writing portion 8.

The writing unit 8 shown in the figure is configured by arranging the ball 8c rotatably in the ball holder 8b, but this is only an example and the present invention is not limited to this.

The joint 9 is composed of a fitting tubular portion 9a having an outer diameter that allows sliding contact with the inner peripheral surface of the ink containing tube 6 and a tip tubular portion 9b into which the writing portion 8 is fitted. A flange cylinder portion 9c is integrally formed on the intermediate outer periphery, and the flange cylinder portion 9c is shorter than the tip cylinder portion 9b and has an upper surface 9c 'opened, and a circulation hole 10 is provided for air circulation. ing. Further, the joint 9 is only one embodiment and is not limited to this. Instead of the flange cylindrical portion 9c, a simple flange-like flange portion 9d as in the embodiment shown in FIG. The upper surface 9d 'of the portion 9d or the like may be provided with a projecting piece 9e which is held in contact with the inner surface 12a of the tip metal 12 which will be described later, and modifications within the scope of the present invention are arbitrary.

Therefore, the joint 9 is inserted into the fitting tube portion 9a from the tip 6b of the ink containing tube 6 so as to be fitted thereto, and the tip 6b is brought into contact with the lower surface 11 of the flange tube portion 9c so that the ink containing tube 6 The tip portion is integrally provided with a writing portion 8, the ink containing tube 6 is inserted into the tip end 1a of the shaft cylinder 1, and the lower surface 11 of the flange cylinder portion 9c is brought into contact with the tip end 1a of the shaft cylinder 1, Then, when a well-known tip 12 is screwed onto the male thread 3 at the tip of the shaft cylinder 1 with a female screw 13 provided on the inner periphery of the rear end, the joint 9 is hidden and the upper surface 9c of the flange cylinder portion 9c is covered. ′ Is pressed against the inner surface 12a of the tip 12, and the writing portion 8 is projected from the tip. The tip 12 is formed such that the inner diameter of the tip 12b is larger than the outer diameter of the writing section 8 (to the extent that the writing section 8 can be smoothly inserted), and any inner surface 12a of the tip 12 is a joint. It does not come into contact with the distal end tube portion 9b of 9.

With the above structure, the air inflow portion 14 is formed between the inner surface of the tip 12b of the tip 12 and the outer surface 8a of the writing portion 8, and the air inflow portion 14 is continuously connected to the air inflow portion 14. An air flow passage a is formed between the inner surface 12a of the gold 12, the outer surface 8a of the writing portion 8 and the outer surface 9b 'of the tip tubular portion 9b, and the inner surface 12a and the outer surface 9c "of the flange tubular portion 9c. The air inflow portion 14 is connected to an air circulation gap b formed by the inner surface 2 of the shaft cylinder and the outer surface 6c of the ink containing tube via the air flow passage a, the circulation hole 10, the communication portion 4, etc. By communicating with the rear end 6a of the housing pipe 6, an air circulation means comprising the air inflow portion 14 → the flow passage a → the circulation hole 10 → the communication portion 4 → the air circulation gap b is formed.

The cap 15 has an internal space c 2 that can accommodate at least the tip 12 part, and a part of the inner peripheral surface thereof is pressed against the outer peripheral surface 12 c of the tip 12 so as to be hermetically fitted. The seal member 15a is provided around the seal member 15a so that the inner space c is provided with a seal member 16 for the writing member that pushes the writing member 8 into pressure contact when it is fitted.

The sealing material 16 is fixedly installed on the inner surface 15b at a position where the writing portion 8 can be pushed in and pressed against when the cap 15 is fitted, that is, the inner surface 15b at a portion away from the top portion 15c in a desired space. The sealing material 16 is made of non-water-absorbing material having resilience, such as rubber or soft resin, and may be foamed (independent foaming is preferable), and the hardness of the writing part 8 is high. The material, structure, etc. are selected accordingly.

Therefore, when the cap 15 is fitted onto the outer peripheral surface 12 c of the tip metal 12, the writing portion 8 is pushed into the sealing material 16. When the internal pressure increases due to the cap 15 being fitted, the air in the internal space c flows from the air inflow portion 14 into the air flow passage a, and the inner surface 2 of the shaft cylinder 2 passes through the flow hole 10 and the communication portion 4. Through the air circulation gap b formed by the outer surface 6c of the ink storage tube and the rear end 6a of the ink storage tube 6, and while reaching the backflow stop 7, the internal space c of the cap 15 and the inside of the barrel 1 Internal pressure can be adjusted.

Further, even if the internal temperature rises due to the cap 15 being fitted and the ink in the ink containing tube 6 expands, the sealing material 16 into which the writing part 8 is pushed prevents the ink from blowing out from the writing part 8. To be done.

[0024]

[Effect of device]

 According to the present invention, a writing part is attached to the tip of an ink containing tube filled with liquid ink and backflow prevention via a joint, and the ink containing tube is fitted into the barrel by forming an air circulation gap. A tip is screwed onto the tip of the to conceal the joint, and the writing section is projected from the tip of the tip to form an air flow passage between the writing section and the joint and the tip, and the air flow The passage is communicated with the air flow gap, and a sealant for a writing part is provided at a position apart from the top part in the cap fitted to the tip part of the shaft cylinder, and the writing part and the writing part are provided on the shaft cylinder or the tip metal or the cap. Since the seal part is provided to shut off the tip metal from the outside, when the cap is fitted, the air in the cap does not flow directly from the writing part into the ink storage tube, but rather between the tip metal and the writing part. Airflow formed from the gap between the outer surface of the joint and the inner surface of the tip metal Through the passage, it enters the air circulation gap between the shaft cylinder and the ink storage pipe, and is further circulated from this circulation gap to the rear end of the ink storage pipe, thereby adjusting the internal pressure between the cap and the shaft cylinder. It will come.

Therefore, even if the cap is a closed cap instead of the conventional cap whose side surface is opened, the writing implement of the present invention having the above-described structure will not allow air to flow directly into the ink containing tube from the writing part when the cap is fitted. It is very convenient because there is no inconvenience that water flows in, and it is possible to sufficiently prevent the writing part from drying out and solve the problems that the prior art had.

In addition, since the non-water-absorbing and restorative sealing material is provided inside the cap at a position apart from the top of the cap, the cap is sealed to seal the inside of the cap and raise the internal temperature, and Even if the ink in the ink swells, the seal material with which the writing part abuts prevents the ink from being blown from the pen tip, so the above-mentioned air inflow prevention effect and the adverse effect of ink blowout by the cap closed type are corrected. Since the writing part is sealed with the seal material from the unsealed state in the cap due to the incomplete fitting of, it is very convenient to use.In addition, the seal material is provided not directly on the top part of the cap but on the top part. Since there is a space between the top of the cap and the sealant, the sealant with resilience is free to escape as the writing part is pressed. Since the barb is secured between the top of the cap and the writing head, it is possible to provide a highly practical writing instrument.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention partially omitted.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a vertical sectional side view showing a part of another embodiment.

[Explanation of symbols]

 A: Writing implement a: Air flow passage b: Air flow gap c: Cap internal space 1: Shaft cylinder 1a: Shaft cylinder tip 4: Communication part 6: Ink storage tube 8: Writing part 8b: Ball holder 8c: Ball 9: Joint 9c: Flange cylinder portion 9c ": Outer surface 10: Air flow passage 12: Tip metal 14: Air inflow portion 15: Cap 15a: Seal portion 16: Seal material 16b: Receiving portion

Claims (4)

[Scope of utility model registration request] 1. A writing section is attached to the tip of an ink containing tube filled with liquid ink and a backflow stopper via a joint, and the ink containing tube is fitted in an axial cylinder with an air circulation gap formed between them. A tip metal is screwed onto the tip of the cylinder to conceal the joint, and a writing portion is projected from the tip of the tip metal to form an air flow passage between the writing portion and the joint and the tip metal. The flow passage is communicated with the air flow gap, and a seal member for a writing part is provided at a position apart from the top part in the cap fitted on the tip part of the shaft cylinder, and the writing part is provided on the shaft cylinder, tip metal or cap. And a writing instrument provided with a seal portion that shields the tip metal from the outside. 2. The writing instrument according to claim 1, wherein the joint is provided with a flow hole that connects the air flow passage and the air flow gap. 3. A communication part which connects the air flow passage and the air flow gap is provided at the tip of the barrel.
Writing instrument described. 4. The writing instrument according to claim 1, wherein the air flow passage and the air flow gap are connected to each other by a flow hole provided in the joint and a communication portion provided at the tip of the shaft cylinder.