JPH0547675Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field This invention is suitable for writing instruments, mainly water-based ballpoint pens,
It relates to writing instruments such as felt-tip pens.

b. Prior Art In so-called knob-type writing instruments, a cap is slidably fitted around the outer periphery of the head of the shaft, and the cap is pushed in against the biasing force of an internal spring, so that the tip of the writing instrument is placed on the shaft. There is one in which the writing body is maintained in a usable state by protruding from the tip and engaging claws on the shaft into holes in the cap.

In such a writing instrument, when the writing instrument is to be stored in the shaft from the above-mentioned ready state, as shown in FIG. Disengage the claw and hole. Then, the cap is pushed upward by the biasing force of the spring, and the tip of the cursive font is recessed into the shaft.

c Problems to be solved by the invention By the way, for example, in a water-based ballpoint pen, water-based ink is stored in the cartridge except for the tip, and this ink is supplied to the ball of the tip via a relay core that is in contact with the ball. be done.

However, when the above-mentioned lock-type mechanism is adopted for such a water-based ballpoint pen, when the tip of the cartridge is retracted into the shaft from a ready-to-use state, the cartridge is moved by the biasing force of the spring, so the cartridge stops. Sometimes there is a shock,
This may cause the relay core and the ball to separate. In such a case, the ink runs out and the cartridge must be replaced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument that does not cause impact and is therefore highly reliable, that is, provides a stable supply of ink.

d Means for solving the problem The writing instrument of the present invention includes an ink cartridge,
A shaft that slidably accommodates the ink cartridge, has a tip protrusion hole for the ink cartridge at its tip, a tongue piece at the head end, and a claw protruding from the outer peripheral surface of the tongue piece. , having an engagement hole that is slidably fitted to the outer periphery of the head of the shaft and that engages the claw with the peripheral wall;
Furthermore, a cap that receives the head of the ink cartridge at the ceiling, and a spring that is interposed between the shaft and the ink cartridge and urges the cap in a direction away from the shaft via the ink cartridge. pushing the cap against the biasing force of the spring to cause the tip of the ink cartridge to protrude from the tip protruding hole of the shaft, and engaging the pawl with the engaging pawl; By maintaining the tip of the ink cartridge in a protruding state and pushing the claw into the cap, the engagement between the claw and the engagement hole is released, and the biasing force of the spring is used to release the engagement between the claw and the engagement hole. In the writing instrument in which the tip of the ink cartridge is returned into the shaft, the engagement holes of the cap are formed at two opposite locations on the circumferential wall of the cap, and the claws of the shaft are also formed in the engagement holes. They are formed in two corresponding locations.

e Function In the writing instrument of the present invention, when the tip of the cartridge that is ready for use, that is, protruding from the tip of the shaft, is to be stored in the shaft, the tips of two fingers are pressed against each nail, and The engagement between the claw and the hole is released by pinching and pushing the cap into the cap. When such an operation is performed, the other fingers that are gripping the shaft will inevitably loosen their grip, causing the shaft to move and store the chip within the shaft while the cap and cartridge remain stationary. The shocks caused by moving and stopping the cartridge are eliminated.

f Embodiment FIGS. 1 to 4 are cross-sectional views showing a writing instrument according to the present invention.

This water-based ballpoint pen has 1 ink cartridge
, a shaft 2 that slidably accommodates the ink cartridge 1, a cap 3 that is slidably fitted to the outer periphery of the head 2a of the shaft 2, and the ink cartridge 1.
and the shaft 2, and the ink cartridge 1
A spring 4 presses the cap 3 against the cap 3.

The ink cartridge 1 is provided with a tip 11 at its tip, and a ball 12 at the tip of the tip 11.

The shaft 2 has a hole 21 at its tip for protruding the tip 11 of the ink cartridge 1, and has a head 2a.
It has four tongue pieces 22, 23, 24, and 25. Among these tongues, opposing tongues 22,
In order to provide elasticity, the widths of the tongues 23 are narrower than the widths of the other opposing tongues 24 and 25, and the tongues 22 and 23
Claws 26 and 27 are formed on the outer circumferential surface of.
On the other hand, the tongue pieces 24 and 25 have a role as a guide for the cap 3, of which tongue piece 2
A protrusion 28 is formed on the outer peripheral surface of 5.

The cap 3 has locking holes 31 and 32 at opposing positions on the peripheral wall, and a stopper hole 3 at a position closer to the cap opening 3a than the locking holes 31 and 32.
It has 3,34. In addition, those holes 33,
A groove 35 extending inward from the opening 3a is formed on the inner surface of the peripheral wall in the middle of the groove 34. Further, a clip 36 is provided on the outer peripheral surface of the cap 3.

Then, the ink cartridge 1 is loaded together with the spring 4 into the shaft 2, and then the groove 35 of the cap 3 is fitted into the protrusion 28 of the shaft 1, and the spring 4 is inserted into the shaft 2.
When the cap 3 is pushed in the direction of the shaft 1 against the urging force of
3 and 34 engage with the pawls 26 and 27 of the shaft 2. In the aqueous ballpoint pen in this state, as shown in FIG. The ceiling portion 3b of No. 3 is pressed against the ceiling portion 3b of No. 3. This pressing force of the ink cartridge 1 acts on the cap 3 and urges the cap 3 in a direction away from the shaft 2.
34 to prevent the cap 3 from separating.

When using this water-based ballpoint pen, please use the shaft 2
, and push the cap 3 in the direction of the shaft 2. Then, the ink cartridge 1 together with the cap 3 is pushed against the biasing force of the spring 4, and the chip 11 is projected out of the shaft 2 through the hole 21 of the shaft 2. During this time, the cap 3 is inserted into its groove 35.
It is moved without rotation by the guidance of the claws 28 and 28. When the cap 3 moves, the claws 26 and 27
The tips of the caps 3 are bent inward against the edges of the holes 33, 34 of the cap 3, thereby releasing the engagement between the claws 26, 27 and the holes 33, 34. When the cap 3 is further moved, the holes 31 and 32 finally reach the claws 26 and 27, and the claws 26 and 27 engage with the holes 31 and 32, as shown in FIG. here,
When the pushing force of the cap 3 is released, the ink cartridge 1 is maintained in that state (usable state).

To store the ink cartridge 1 into the shaft 2 again from this ready state, use the fingertips of two fingers to
For example, as shown in FIG.
6, 27, push the claws 26, 27 into the cap 3, and connect the claws 26, 27 with the holes 31, 32.
disengage. Then, shaft 2 is connected to spring 4
The tip 11 of the ink cartridge 1 is pushed away from the cap 3 by the biasing force of the ink cartridge 1, and as a result, the tip 11 of the ink cartridge 1 is housed in the shaft 2 as shown in FIG.

That is, in the water-based ballpoint pen of the present invention, when storing the tip 11 of the ink cartridge 1 into the shaft 2, two fingers are used to press the claws 26, 27 and the hole 31,
The feature is that the engagement of 32 is released. If you do this, the force of the other fingers that are gripping the shaft 2 will inevitably be loosened, and the shaft 2 will move and the tip 11 will be moved between the shafts 2 and 2.
Ink cartridge 1
does not move. Therefore, the ink cartridge 1 is not subjected to any impact caused by the movement of the ink cartridge 1.

In the above embodiments, a water-based ballpoint pen was used as the writing instrument, but it goes without saying that the present invention can also be applied to felt-tip pens and the like.

g. Effects of the invention As described above, in the writing instrument according to the invention, when the ink cartridge in a usable state is stored in the shaft, the ink cartridge does not move.
Therefore, the ink cartridge is not subjected to impact due to movement and stopping of the cartridge. Therefore, in the case of a water-based ballpoint pen, troubles such as separation between the ball and the relay core are avoided as much as possible, and a highly reliable product is provided without running out of ink.

[Brief explanation of the drawing]

Figures 1 to 4 show the writing instrument according to the present invention, with Figure 1 being a longitudinal cross-sectional view of the writing instrument in its usable state, and Figure 2 being rotated 90 degrees with respect to the axis from the state shown in Figure 1. FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, FIG. 4 is a vertical cross-sectional view of the ink cartridge with the chip stored in the shaft, and FIG. 5 is a vertical cross-sectional view of the ink cartridge according to the present invention. FIG. 6 is a diagram showing the operation of a writing instrument, and FIG. 6 is a diagram showing the operation of a conventional water-based ballpoint pen. 1... Cartridge, 1a... Head, 2...
Shaft, 3... Cap, 3a... Opening, 3b... Ceiling, 4... Spring, 11... Chip, 12
... Ball, 21 ... Chip protrusion hole, 22,2
3, 24, 25... tongue piece, 26, 27... nail, 2
8... Protrusion, 31, 32... Locking hole, 33, 34
...Stopper hole, 35...Groove, 36...Clip.

Claims (1)

[Scope of utility model registration request] an ink cartridge, the ink cartridge is slidably accommodated, the tip of the ink cartridge has a tip protrusion hole at the tip, a tongue piece is formed at the head end, and a claw is provided on the outer peripheral surface of the tongue piece. It has a protruding shaft, an engagement hole that slidably fits into the outer periphery of the head of the shaft, engages the pawl in the peripheral wall, and further receives the head of the ink cartridge at the ceiling. a spring interposed between the shaft and the ink cartridge, the spring biasing the cap away from the shaft via the ink cartridge, the cap resisting the biasing force of the spring; and push in the ink cartridge to make the tip of the ink cartridge protrude from the tip protrusion hole of the shaft, and engage the pawl with the engaging pawl to maintain the tip of the ink cartridge in the protruding state. By pushing the claw into the cap, the engagement between the claw and the engagement hole is released, and the tip of the ink cartridge is returned to the shaft by the biasing force of the spring. A writing instrument characterized in that the engagement holes of the cap are formed at two opposite locations on the circumferential wall of the cap, and the claws of the shaft are also formed at two locations corresponding to the engagement holes. .