JPH023906Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in writing instruments such as water-based ballpoint pens and felt-tip pens.

A conventional writing instrument of this kind has an air hole provided at the tip of a barrel housing an ink storage body to adjust the internal pressure within the barrel. However, since these air holes are simply small holes, they tend to become clogged inadvertently due to impacts, etc., and the internal pressure adjustment function does not work, which often results in poor ink flow and other deterioration in writing performance. Furthermore, since the relay core attached to the writing section is often located near the air hole, when the cap is not fitted, volatile ink components evaporate from this relay core, and non-volatile ink components remains in the relay core, making it impossible to write even though sufficient ink remains in the ink absorber. Further, since the distance between the ink absorber and the air hole is short, evaporation from the ink absorber causes shortening of the writing life.

The present invention attempts to solve the above-mentioned drawbacks, and includes an ink absorber receptacle fitted to the tip of the shaft cylinder, and an ink absorber built into the rear of the ink absorber receptacle.
In a writing instrument in which a relay core with a writing section at the tip is inserted through the ink storage body holder in the axial direction, the airflow passage is formed into a longer, thinner, and more curved shape to control ink evaporation as much as possible. It is an object of the present invention to provide a writing instrument that can prevent clogging of airflow passages and always exhibit sufficient writing performance.

Hereinafter, the present invention will be explained based on the illustrated embodiments. Fig. 1 is a longitudinal sectional side view showing one embodiment of the writing instrument according to the present invention, and A and B in Fig. 2 are A--A in Fig. 1.
There are cross-sectional views along lines A and B-B. Reference numeral 1 denotes a shaft cylinder, and an ink storage body receptacle 2 is fitted into the tip end of the shaft cylinder 1, and an ink storage body 3 is built in the rear part thereof. In the axial direction of the ink storage body receiver 2,
A relay core 4 having a writing portion 5 at the tip is inserted through the core. Further, a tail plug 6 is attached to the rear end of the shaft cylinder 1. The ink storage body receiver 2 fitted into the inner tip of the shaft cylinder 1 has circumferential grooves 7 and 8 formed at two locations on its outer periphery, one at the tip and the other at a predetermined interval. In addition, both circumferential grooves 7 and 8 in the illustrated embodiment
Although the corners of the ink storage body receptacle are formed in an L shape, the shape of the circumferential grooves 7 and 8 is not limited to this shape, and may be formed into a U shape, V shape, or shape. Of course, it may be of any suitable shape.
Further, a front communication groove 9 is formed in the longitudinal direction between the tip circumferential groove 7 and the center circumferential groove 8, and a phase connection groove 9 is formed in the longitudinal direction between the center circumferential groove 8 and the rear end. A rear communication groove 10 is bored at an offset position (see Fig. 2). The shaft cylinder 1 is provided with an air hole 11 at a position corresponding to the circumferential groove 7 at the tip end of the ink storage body receiver 2 . When the ink storage body receiver 2 is tightly fitted to the inner wall of the shaft cylinder 1, the outside and the inside of the shaft cylinder 1 are connected to each other by the air hole 11, the tip circumferential groove 7, the front communication groove 9,
Central circumferential groove 8 and phase-shifted rear communication groove 1
An air flow passage is formed that communicates through the air.

Therefore, when the inside of the shaft cylinder 1 becomes overpressurized,
Rear communication groove 10 in which the air in the shaft cylinder 1 is out of phase
to the center circumferential groove 8, and then from the front communication groove 9 to the tip circumferential groove 7, through which the air hole 11 of the shaft cylinder 1 is bored at a position corresponding to the tip circumferential groove 7. It communicates with the outside through the flow passage, and the internal pressure inside the shaft cylinder 1 can be adjusted. In addition, since the air flow path with the outside is long, it is possible to suppress the evaporation of ink in the ink storage body 2 as much as possible. There will be no residue left on the writing instrument, and the life of the writing instrument will not be inadvertently shortened.

FIG. 3 is a longitudinal side view of another embodiment according to the present invention, the only difference being that the circumferential groove formed in the center of the ink storage body receiver 2 is formed into a concave central circumferential groove 12. Other components with the same reference numbers have the same parts and the same configuration, so a description thereof will be omitted.

As described above, in the present invention, the ink absorber receiver 2 is fitted into the inner tip of the shaft cylinder 1, and the ink absorber 3 is built into the rear part of the ink absorber receiver 2. In a writing instrument in which a relay core 4 having a writing portion 5 is inserted through the ink absorber receiver 2, circumferential grooves 7, 8 are provided at two locations on the outer periphery, at the tip and at the center, at a predetermined interval. , and between the tip circumferential groove 7 and the center circumferential groove 8 and between the center circumferential groove 8 and the rear end, both communicating grooves 9 and 10 are formed at the front and rear portions with a phase shift in the longitudinal direction. On the other hand, an air hole 11 is bored in the shaft cylinder 1 at a position corresponding to the circumferential groove 7 at the tip end of the ink storage body receiver 2, and the ink storage body receiver 2 is connected to the shaft. Cylinder 1
When tightly fitted to the inner wall, the outer and shaft cylinder 1
An air flow passage is formed in which the inner and outer parts communicate with each other via the air hole 11, the tip circumferential groove 7, the front communication groove 9, the center circumference groove 8, and the rear communication groove 10 which is out of phase. Since the length increases, the movement and diffusion of air is suppressed, so evaporation of ink can be suppressed as much as possible, and the internal pressure inside the shaft cylinder 1 can be adjusted. In addition, since the ink storage body receiver 2 is tightly fitted to the inner wall of the shaft tube 1, evaporation of ink from the relay core 4 is suppressed.
Even if the cap is not inserted, it will not become impossible to write.

Further, a circumferential groove 9 formed in the ink storage body receiver 2,
Since the holes 10 are bored out of phase with each other, it is possible to prevent ink from flowing in. This prevents the airflow passage from being inadvertently blocked, making it impossible to adjust the internal pressure and reducing writing performance. do not have.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of the writing instrument according to the present invention.
A and B in Figure 2 are lines A-A and B in Figure 1, respectively.
3 is a longitudinal sectional side view showing another embodiment. 1...Shaft cylinder, 2...Ink storage body receiver, 3...
Ink absorbing body, 5... Writing section, 7, 8, 12...
Circumferential groove, 9, 10... Communication groove, 11... Air hole.

Claims (1)

[Scope of utility model registration request] An ink absorber receptacle is fitted into the tip of the shaft cylinder, an ink absorber is built into the rear of the ink absorber, and a relay core having a writing section at the tip is inserted through the ink absorber receptacle in the axial direction. In a writing instrument, the ink storage body receptacle has two circumferential grooves at a predetermined interval at the tip and the center of its outer periphery, and a circumferential groove between the tip and the center circumferential groove and at the center. Both communication grooves at the front and rear are bored out of phase with each other in the longitudinal direction between the circumferential groove and the rear end, and on the other hand, the shaft cylinder corresponds to the circumferential groove at the tip of the ink storage body receiver. When the ink storage body receiver is tightly fitted to the inner wall of the shaft cylinder, the outside and the inside of the shaft cylinder are connected to the air hole, the circumferential groove at the tip end, and the front part. A writing instrument characterized by forming an air flow passage communicating through a communication groove, a central circumferential groove, and a phase-shifted rear communication groove.