JP6781573B2 - Refill for writing instruments - Google Patents

Description

The present invention relates to a refill for writing instruments.

Conventionally, a refill for a writing instrument has been known as a cartridge for replacing ink of a writing instrument. A general refill for a writing instrument includes an ink accommodating portion for accommodating unused ink and a writing portion such as a writing ball or a batting impregnated with ink. When the ink of the writing instrument is exhausted, the user takes out the old writing instrument refill from the writing instrument and sets the new writing instrument refill in the writing instrument.

As such a refill for writing instruments, a metal material is processed by deep drawing molding, and a tubular portion constituting an ink accommodating portion and a tubular portion on the writing side including the writing portion are often integrally molded. The deeply drawn refill for writing instruments has a structure that is strong against bending loads on the writing part because there is no joint part between the writing part and the ink containing part, and therefore ink leakage from the ink containing part is unlikely to occur. It had the advantage of.

However, since advanced molding technology is required to integrally mold the ink accommodating portion and the tubular portion on the writing side by deep drawing molding, in recent years, two tubular members are molded as separate bodies and both are formed by a joint. A connected refill for writing instruments is used (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-813

However, as described above, the reason why the integrally molded product using deep drawing molding is used is that there is an advantage that ink leakage is less likely to occur when deep drawing molding is used. When the two tubular members are molded as separate bodies as in No. 1, the joint strength between the joint and the two tubular members is weak, and ink leakage may occur.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a writing instrument refill capable of improving the joint strength in a writing instrument refill in which two tubular bodies are connected by a joint. And.

In order to solve the above-mentioned problems, the present invention presents an ink containing pipe, a writing side pipe provided on the tip side of the ink containing pipe and including a writing portion, the ink containing pipe and the writing side. A refill for a writing tool including a joint to which a pipe is connected, a tip side end connected to the joint of the ink containing pipe, and a rear side connected to the joint of the writing side pipe. The edges overlap in the radial direction of the refill.

According to the present invention configured in this way, the holding force strength of the writing pipe due to the effect of tightening from the radial direction at the overlapping portion where the tip end side of the ink containing pipe and the rear end side of the writing side pipe overlap. And by being able to disperse the stress when a bending load or the like is applied to the ink accommodating pipe side as well, it is possible to improve the joint strength between the joint and the ink accommodating pipe and the joint and the writing side pipe.

Further, preferably, in the present invention, a plurality of ribs press-fitted into the tip end side of the ink containing pipe are formed on the outer periphery of the joint.

According to the present invention configured as described above, by forming a plurality of ribs on the outer periphery of the joint, the joint can be more firmly fixed in the tip end side of the ink containing pipe.

Further, preferably in the present invention, the joint includes a tubular receiving portion for receiving the writing side pipe, and a plurality of ribs are formed on the inner circumference of the receiving portion.

According to the present invention configured as described above, by forming a plurality of ribs on the inner circumference of the receiving portion of the joint, the rear end side of the writing side pipe can be more firmly fixed in the receiving portion of the joint. ..

Further, preferably, in the present invention, the inside of the writing side pipe is located closer to the ink containing pipe than the position where the tip end side of the ink containing pipe and the rear end of the writing side pipe overlap in the axial direction. A backflow prevention unit is provided to prevent the ink from flowing back into the ink storage pipe.

According to the present invention configured as described above, the backflow prevention unit can prevent the ink in the writing side pipe from flowing back into the ink containing pipe. When the backflow prevention portion is provided on the ink accommodating pipe side rather than the position where the writing side pipe and the ink accommodating pipe overlap, the joint is press-fitted into the ink accommodating pipe and the joint is deformed radially inward. However, it is possible to prevent the function of the backflow prevention portion from being hindered by the deformation of the joint.

As described above, according to the present invention, it is possible to improve the joint strength in a writing instrument refill in which two tubular bodies are connected by a joint.

It is a side view of the refill for writing instruments by embodiment of this invention. It is a side sectional view of the refill for a writing instrument according to the embodiment of this invention. It is a side view of the joint of the refill for writing instruments by embodiment of this invention. It is a side sectional view of the joint of the refill for writing instruments according to the embodiment of this invention.

Hereinafter, the refill for writing instruments according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a refill for a writing instrument according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the refill for a writing instrument. In the specification, the front end side or the front side means the side where the writing part is provided in the axial direction of the writing instrument refill, and the rear end side or the rear side means the side where the writing part is not provided. , The axis refers to the axis of the refill for writing instruments extending in the longitudinal direction.

As shown in FIGS. 1 and 2, the writing instrument refill 1 connects an ink containing pipe 3 for containing ink, a writing side pipe 7 including a writing portion 5, and an ink containing pipe 3 and a writing side pipe 7. The joint 9 is provided.

The ink storage pipe 3 is formed of a tubular body having a hollow inside, and is filled with a predetermined amount of ink. A tail plug 11 is press-fitted into the rear end side of the ink storage pipe 3. A cam shape is formed at the rear end of the tail plug 11 so as to engage with the writing instrument to which the writing instrument refill 1 is mounted.

The writing side pipe 7 is formed of a tubular body having a diameter smaller than that of the ink containing pipe 3, and a writing portion 5 is provided at the tip thereof. In the present embodiment, since the refill for a writing instrument for a ballpoint pen is given as an example, the writing unit 5 includes a writing ball 13. In addition to ballpoint pens, the present invention can also be applied to marking pens and the like that impregnate batting with ink.

Ink is supplied from the ink storage pipe 3 into the writing side pipe 7 via the joint 9. Then, the ink in the writing side pipe 7 adheres to the writing ball 13, and the ink adhered to the writing ball 13 is transferred to the paper surface by rotating the writing ball 13.

FIG. 3 is a side view of the joint, and FIG. 4 is a side sectional view of the joint. As shown in FIGS. 3 and 4, the joint 9 has a substantially tubular shape, and the rear end side of the outer periphery thereof is press-fitted into the ink storage pipe 3. Further, a receiving portion 15 for receiving the writing side pipe 7 is provided on the tip end side of the joint 9.

More specifically, the rear end side of the outer circumference of the joint 9 has an outer diameter slightly larger than the inner diameter of the ink storage pipe 3. A plurality of ribs 17 are provided at substantially the center of the outer circumference of the joint 9 in the axial direction. The plurality of ribs 17 are arranged at equal intervals in the circumferential direction of the joint 9. The top surfaces of all the ribs 17 are curved so as to form a circle centered on the axis when viewed from the axis direction. The diameter of the circle formed at this time is slightly larger than the inner diameter of the ink containing pipe 3. By forming the plurality of ribs 17 in this way, when the joint 9 is press-fitted into the ink storage pipe 3, the top surface of the ribs 17 and the inner circumference of the ink storage pipe 3 come into contact with each other, and the joint strength between the two is improved. To do. Further, by providing the rib 17, the circumference of the rib 17 can be recessed inward in the radial direction, and the thickness of the joint 9 in the radial direction can be reduced around the rib 17. As a result, when the joint 9 is injection-molded, deformation of the joint 9 due to so-called "sink" can be suppressed. Further, by fixing the joint 9 and the ink storage pipe 3 with a plurality of ribs 17, the work of press-fitting the joint 9 into the ink storage pipe 3 while maintaining the joint strength between the joint 9 and the ink storage pipe 3. The sex can be improved.

A diameter-expanded portion 19 is provided on the outer periphery of the joint 9 on the rear end side of the rib 17. The diameter of the enlarged diameter portion 19 is also slightly larger than the inner diameter of the ink containing pipe 3. Then, when the joint 9 is press-fitted into the ink storage pipe 3, the enlarged diameter portion 19 forms a seal so that the ink in the ink storage pipe 3 does not leak from between the joint 9 and the ink storage pipe 3.

Further, a diameter-expanded portion 21 larger than the inner diameter of the ink storage pipe 3 is provided on the outer periphery of the joint 9 on the tip side of the rib 17. The outer diameter of the enlarged diameter portion 21 is preferably the same as the outer diameter of the ink accommodating pipe 3, and the enlarged diameter portion 21 functions as a stopper when the joint 9 is press-fitted into the ink accommodating pipe 3.

The receiving portion 15 of the joint 9 has a tubular shape having an inner diameter slightly larger than the outer diameter of the writing side pipe 7. A plurality of ribs 23 for contacting the writing side pipe 7 and holding the writing side pipe 7 are provided on the inner circumference of the receiving portion 15. The plurality of ribs 23 are formed at equal intervals in the circumferential direction, and the top surfaces of the plurality of ribs 23 are curved so as to form a circle centered on the axis when viewed from the axis direction. The diameter of the circle formed at this time is slightly smaller than the outer diameter of the writing side pipe 7. By forming the plurality of ribs 23 in this way, when the writing side pipe 7 is press-fitted into the joint 9, the top surface of the rib 23 and the outer circumference of the writing side pipe 7 come into contact with each other, and the joint strength between the two is improved. .. Further, behind the rib 23, a seal portion 24 is formed by press-fitting the outer peripheral surface of the writing side pipe 7 to maintain airtightness.

The rear end of the receiving portion 15 is located on the rear side of the enlarged diameter portion 21. Therefore, when the ink accommodating pipe 3 and the writing side pipe 7 are joined to the joint 9, the ink accommodating pipe 3 and the writing side pipe 7 overlap in the radial direction over a predetermined width L. By providing such an overlapping portion, the joint strength between the joint 9 and the ink storage pipe 3 and the joint strength between the joint 9 and the writing side pipe 7 can be improved.

Further, a backflow prevention portion 25 is provided on the rear side of the overlapping portion and between the overlapping portion and the tip end side of the ink storage pipe 3. The backflow prevention portion 25 is configured by arranging the check ball 27 in the space communicating the receiving portion 15 and the rear side of the joint 9. The check ball 27 cannot move to the rear side of the predetermined position due to the reduced diameter structure of the backflow prevention portion 25. Therefore, when the ballpoint pen is set up so that the writing ball 13 is located on the lower side, the check ball 27 moves downward and the ink in the ink storage pipe 3 passes through the space of the backflow prevention portion 25 and the writing side pipe 7 is used. Inflow to. When the inside of the writing side pipe 7 is filled with ink, the writing ball 13 moves upward due to the buoyancy of the ink and closes the opening of the backflow prevention portion 25 on the ink containing pipe 3 side. This makes it possible to prevent backflow of ink.

Then, when the writing side pipe 7 is press-fitted into the receiving portion 15 of such a joint 9, the writing side pipe 7 is joined to the joint 9 by the rib 23 in the receiving portion 15. Further, by press-fitting the rear end side of the joint 9 into the ink storage pipe 3, the top surface of the rib 17 comes into contact with the inner peripheral surface of the ink storage pipe 3, and the joint 9 and the ink storage pipe 3 can be joined. Then, by applying pressure from the outside to the inside in the radial direction to the overlapping portion, or by press-fitting a press-fitting tool such as a screw in the radial direction, the writing side pipe 7 and the joint 9 are formed. The joint with the ink containing pipe 3 can be further strengthened.

1 Refill for writing instruments 3 Ink storage pipe 5 Writing part 7 Writing side pipe 9 Fitting

Claims (3)

An ink storage pipe that stores ink and
The writing side pipe provided on the tip side of the ink storage pipe and including the writing part,
A writing instrument refill comprising a joint for connecting the ink containing pipe and the writing side pipe, respectively.
The front end of the ink containing pipe connected to the joint and the rear end of the writing pipe connected to the joint overlap in the axial direction of the refill.
On the outer periphery of the joint, a plurality of ribs press-fitted into the tip end side of the ink containing pipe , and an enlarged diameter portion provided on the rear end side of the ribs to seal the ink in the ink containing pipe so as not to leak. Is formed, a refill for writing instruments. An ink storage pipe that stores ink and
The writing side pipe provided on the tip side of the ink storage pipe and including the writing part,
A writing instrument refill comprising a joint for connecting the ink containing pipe and the writing side pipe, respectively.
The front end of the ink containing pipe connected to the joint and the rear end of the writing pipe connected to the joint overlap in the axial direction of the refill.
The joint has a tubular receiving portion that receives the writing side pipe, a plurality of ribs provided on the inner circumference of the receiving portion, and is formed behind the ribs so that the outer peripheral surface of the writing side pipe is press-fitted to be airtight. It has a seal part that keeps it, and a refill for writing instruments. The ink in the writing side pipe is inside the ink containing pipe on the ink receiving pipe side from the position where the tip end side of the ink containing pipe and the rear end side of the writing side pipe overlap in the axial direction. The refill for writing instruments according to claim 1 or 2, wherein a backflow prevention unit is provided to prevent backflow.

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