JPH0541909Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to an improvement in the refill of water-based ballpoint pens and the like used in knock-type writing instruments.

(Prior Art) It is necessary to provide a refill of a water-based ballpoint pen or the like with an air hole for adjusting the internal pressure. However, the ink evaporates from these air holes, which has the disadvantage of shortening the writing life. There are also air holes provided on the front side of the re-feel and those provided in the tail plug fitted to the rear end of the re-reel. Therefore, in order to prevent ink from evaporating, the former case is applied to cap-type writing instruments that seal the tip and air hole at the same time.
In the latter case, a means for constructing a narrow and long air flow path is used to suppress ink evaporation, but if left for a long time, ink evaporation will gradually progress and shorten the service life. In addition, the ink evaporates faster than at the tip of the tip, and as the ink evaporates, the area directly under the ball dries, causing problems such as blurring when writing. Therefore, this type of refill is sealed in a film mainly made of aluminum thin film using a heat seal or the like, and when used, the sealed state is released and the refill is mounted on a notebook type writing instrument or the like. However, the method of unsealing the film is inconvenient to handle, and there is also a method of enclosing the entire writing shaft with a refill mounted on the shaft, but there are many drawbacks such as the inside cannot be seen and the writing is not easily displayed to the user. Note that a transparent film has a significantly inferior ability to suppress ink evaporation.

(Problems to be Solved by the Present Invention) The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional examples, namely, to extend the writing life of knob-type writing instruments such as water-based ballpoint pens, and to extend the writing life of knob-type writing instruments such as water-based ballpoint pens. The idea is to allow the user to pick it up and check it without the hassle of opening the seal and mounting it on the shaft.

(Means for Solving the Problems) The refill for the water-based ballpoint pen and other knot-type writing instruments of the present invention, which was devised to achieve the above object, is a resin molded product with an excellent property of suppressing ink evaporation. A ballpoint pen tip is fixed to the tip of the front shaft, an ink storage body is inserted into the refill body, the tip side is connected to the ink guide core, and the rear end of the refill body is connected to the tip. A tail plug is fitted tightly, and a horizontal hole communicating with the ink internal part is provided in the front shaft, and a cap-shaped cylindrical body with a closed tip is tightly fitted and attached to the front shaft, and the outer periphery of the front shaft and A re-feel is formed by appropriately forming a space and a vertical groove in communication with the horizontal hole between the inner periphery of the cylindrical body and the air flow path leading to the tip of the tip. When doing so, the tip should be punched to allow the tip to protrude and remove the blockage at the tip.

(Example) A refill 1 of a knob-type writing instrument such as a water-based ballpoint pen, which is an embodiment of the present invention shown in FIG. 10 and a rear shaft portion 11, and a rear end portion 23 of a tip 21 holding a ball portion 22 is fixed to the small diameter portion 8 at the tip of the front shaft portion 10. Further, an ink guide core 24 is inserted into the tip 21 almost directly below the ball portion 22, and the rear portion is an undercut portion 13 provided at the rear end inside the small diameter portion 8.
The guide cylinder 12 extends from the rear end of the undercut part 13 within the medium diameter part 9 behind the small diameter part 8 , and projects to the inner diameter part of the large diameter part 29 . On the other hand, an ink storage body 25 filled with ink is inserted from the rear end of the rear shaft portion 11, and its front end surface approximately contacts the rib 17 at the tip inside the large diameter portion 29, and the rear end of the ink guiding core 24 is It is appropriately recessed from the front end of the storage body 25. In addition, a tail plug 5 having a notch 7 at the tip and a circumferential rib 6 on the outer periphery is tightly fitted and fixed to the rear end hole of the rear shaft portion 11, and the tip of the tail plug 5 has an ink storage member. 25 is substantially in contact with the rear end surface of the holder 25. By the way, a space 14 is formed in the form of a circumferential groove substantially at the rear of the large diameter portion 29, and a horizontal hole 15 is further formed within the groove that communicates with the inner hole. Further, on the side approximately 180° opposite to the horizontal hole 15, the large diameter portion 29 and the medium diameter portion 9 have vertical grooves 16 and
6' is provided. Further, the inner hole of the refill body 2 is provided with a space that allows air to flow between the front and rear ends of the ink storage body 25, and in particular, the side hole 15
A rib (not shown) for holding the ink storage body is provided in the inner hole so that an appropriate space can be maintained at the location where the ink storage body is located. In addition, the distal end 27 with the distal end closed
The refill front cylinder 3, which is a cap-shaped cylinder having a shape and is made of the same resin molded product as the refill main body 2, accommodates and tightly fits the tip 21, small diameter part 8, medium diameter part 9, and large diameter part 29. It is fixed. Further, a vertical groove 18' is provided in the inner diameter part of the re-feel front cylinder 3 in a part that tightly fits the outer periphery of the tip 21, a vertical groove 18 is provided in a part that tightly fits in the small diameter part 8, and furthermore, a longitudinal groove 18' is provided in the part that tightly fits the outer periphery of the tip 21, and a longitudinal groove 18 is provided in the part that fits tightly in the small diameter part 8. A space 20', a space 20, and a space 19 are formed from the distal end side between the rear end and the inner diameter of the refill front cylinder 3 at the rear end of the medium diameter portion 9. As a result of the above, the tip 27 is indicated by the arrow A shown in FIG.
When it is cut and removed, an air hole 26 is formed at the tip of the diameter portion 28, and an air flow path is formed between the inner hole of the refeel body 2 and the air hole 26, which communicates with the horizontal hole 15 through a space, a vertical groove, etc. is formed. (See Fig. 2) Note that the locking protrusion 4 formed at the rear of the rear shaft portion 11 shown in Fig. 1 engages with the locking portion provided on the writing instrument when the refeel 1 is mounted on the knob-type writing instrument. It is provided so that the writing instrument is stopped so that the tip part protrudes from the tip of the writing instrument, and is not particularly related to the gist of the present invention.

(Function) The configuration of the present invention is as described above, and since the refill 1 is mounted on the knock-type writing instrument in the state shown in Fig. 1, the tip 21 and the air flow path are closed, so that the evaporation of ink is ensured. It is suppressed and stored for a long time. When in use, by knocking the writing instrument to make the tip 27 protrude from the tip of the shaft and removing that portion, the writing tip is exposed and an air hole 26 is formed, allowing writing. In addition, since the airflow passages are appropriately formed by spaces, long thin vertical grooves, etc., evaporation of ink is suppressed even when used for a long period of time, and it is possible to maintain a long writing life.

(Effects of the invention) The structure and operation of the invention are as described above.
Even if the product is left in a store for a long period of time, it prevents ink from evaporating and the tip of the brush from drying out, allowing it to maintain its initial quality, and the user does not have to worry about unwrapping the refill's aluminum pack and loading it into a writing instrument as in the past. This has great effects, such as being able to easily check the knock status without any problems.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, showing the state of refill storage. Further, FIG. 2 is a perspective view showing how the refill is used. 1...Refeel, 2...Refeel body, 3
... Re-feel front cylinder, 4 ... Locking protrusion, 5 ... Tail plug, 6 ... Circumferential rib, 7 ... Notch groove, 8 ... Small diameter part, 9 ... Medium diameter part, 10 ... Front shaft Part, 11... Rear shaft part, 12... Guide cylinder part, 13... Undercut part, 14... Space part, 15... Horizontal hole, 16...
Vertical groove, 16'... Vertical groove, 17... Rib, 18...
Vertical groove, 18'... Vertical groove, 19... Space, 20...
...space part, 21...chip, 22...ball part,
23... Rear end portion, 24... Ink guiding core, 25...
... Ink storage body, 26 ... Air hole, 27 ... Tip part, 28 ... Diameter part, 29 ... Large diameter part.

Claims (1)

[Scope of utility model registration request] A refill main body 2 made of a resin molded product with excellent properties for suppressing ink evaporation is formed by a front shaft portion 10 and a rear shaft portion 11, and a ball portion 2 is provided at the tip of the front shaft portion 10.
At the same time, the ink storage body 25 filled with ink is inserted from the rear end of the rear shaft part 11, and the rear end is tightly fitted with the tail plug 5, and the ink is inserted from almost directly below the ball part 22. In the refill 1 of a knob-type writing instrument such as a water-based ballpoint pen, which is connected to an occluding body 25 and provided with an ink guiding core 24, the front shaft portion 10 is made of a resin molded product of the same quality as the refill main body 2, and the tip shaft portion 27 The re-feel front cylinder 3, which has reached the point where it has been closed, is tightly fitted and fixed, and a horizontal hole 15 that communicates with the ink-containing part is provided at the approximately rear part of the front shaft part 10, and communicates with the horizontal hole 15 to connect the outer periphery of the front shaft part 10 and the front of the re-feel. A space and a vertical groove are suitably formed between the inner periphery of the cylinder 3 and an air flow path reaching at least the outer periphery of the tip 21, and the tip is mounted on a knock-type writing instrument and clicked to release the tip from the tip of the writing shaft. A water-based product characterized in that the tip shaft portion 27 is protruded, the blocked portion at the tip is removed by cutting it, and an air hole 26 communicating with the inner hole of the refill body 2 is opened in the tip surface. Refill for knob-type writing instruments such as ballpoint pens.