JPH0539914Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to writing instruments such as ballpoint pens, water-based ink pens, fountain pens, etc., and particularly relates to cat press writing instruments.

[Conventional technology]

FIG. 4 is a cross-sectional view of an example of a conventional capsule-press writing instrument, showing the pen tip in the retracted state, and FIG. 5 is a cross-sectional view showing the same pen tip in the protruding state.

4 and 5, 1 is an outer cylinder, 2 is a writing shaft inserted into the outer cylinder 1, and 4a and 4b are ends that cover the tip of the writing shaft 2 with a gap of 3. These are two vertically split inner cylinder portions forming a closed inner cylinder 4. 5 is a notch provided at the rear end of the writing shaft 2;
10 is a return spring provided between the spring seat 8 provided on the writing shaft 2 and the rear end flange 9 of both vertically split inner cylindrical portions 4a and 4b; 10 is the fulcrum of both flange portions 9; It is provided in part 1.

In such a conventional example, the notch portion 5 of the writing shaft body 2
When pressed against the return spring 6, the inner cylindrical part 4 is split vertically on both sides.
a, 4b are pushed open by the slope 11 at the tip of the writing shaft 2, and the pen tip 2a of the writing shaft 2 comes out from the vertically split inner cylinder parts 4a, 4b and protrudes from the tip of the outer cylinder 1. It is held in this state by a rotating cam mechanism (not shown), and writing can be performed using the pen tip 2a of the writing shaft body 2.

When the notch part 5 is pressed again, the holding by the rotary cam mechanism is released, the writing shaft body 2 is returned by the spring force of the return spring 6, and the both vertically split inner cylinder parts 4a and 4b press against the rear end collar part 9. It can be closed by rotating around the fulcrum 10.

[Problem that the invention attempts to solve]

However, in the above conventional example, both vertically cracked inner cylinder portions 4a, 4
In the closed state b, the pen nib 2a of the writing shaft 2 is not sealed by the inner cylinder 4 which can be opened and closed at one end, so the amount of ink solvent and water evaporated from the pen nib 2a and consumed is large, and Make it impossible to write the period. In addition, when the both vertically split inner cylinder parts 4a and 4b are in the open state, since the portion of the writing shaft 2 near the pen tip 2a is supported by the tip opening of the outer cylinder 1, the pen tip 2a
If there is a gap between the vicinity of the outer cylinder 1 and the tip opening of the outer cylinder 1, it may cause wobbling when writing, which not only makes it difficult to write, but also causes the inner cylinder parts 4a and 4b with vertical cracks to touch the rear end flange 9. Since the structure is such that it can be opened and closed by rotating around a fulcrum 10 pressed by a return spring 6, there was a problem in that the inner cylinder 4 could not be supported stably.

[Means for solving problems]

In order to solve the above-mentioned problems, the cat press writing instrument of the present invention has a writing shaft 2 inserted into an outer cylinder 1 as shown in FIGS. Inner cylinder 4 that can be opened and closed at one end
By pushing the notch portion 5 of the writing shaft 2 against the return spring 6 or returning it by the force of the spring, the inner cylinder 4, which can be opened and closed at one end, is opened and closed, and the pen tip 2a of the writing shaft 2 is opened and closed. In the cartridge press writing instrument which can be inserted into and taken out from the inner cylinder 4, the inner cylinder 4, which can be opened and closed at one end, is an elastic member having elastic contact pieces 12a and 12b that press against the inner surface of the tip 1a of the outer cylinder 1 at the openable and closable end. An inner cylinder 4 whose one end can be opened and closed, and a rear end flange 9 and an elastic seal part 7 on the inner surface of the rear end of the inner cylinder 4 are respectively engaged with the inner periphery of the tip 1a of the outer cylinder 1 and the writing shaft 2, The inner cylinder 4 and its elastic contact piece 12 are brought into sliding contact and when the inner cylinder 4 is in the open state.
The structure is such that a portion of the writing shaft 2 in the vicinity of the pen tip 2a is supported under pressure between the openable and closable ends of the inner cylinder 4 by the elastic restoring forces of a and 12b.

[Effect]

When the inner cylinder 4, which can be opened and closed at one end, is in the closed state, elastic contact pieces 12a and 12b are pressed against the inner surface of the tip portion 1a.
The opening/closable end is sealed with the elastic restoring force of Since the nib 2a part of the body 2 is sealed, the solvent and moisture of the ink are absorbed into the nib 2a.
The amount of evaporation and consumption can be significantly reduced, allowing for long-term writing.

In the present invention, the opening/closable end is pushed open by the pressure of the pen tip 2a, the pen tip 2a is inserted, and the pen tip 2a is inserted, and the pen tip 2a is inserted, and the writing shaft body 2a is
The inclined surface 11 presses the inner surface of the inner tube 4 which can be opened and closed at one end to bend the inner tube 4 outward to open the end which can be opened and closed, and then the pen tip 2a is inserted and pulled out. After that, it is sealed, so ink scum does not adhere to the openable end and the sealing effect is not deteriorated, and the sealing effect can be maintained for a long period of time. Therefore, evaporation of the ink solvent and water can be prevented, and the period during which writing can be performed can be significantly extended.

When the inner cylinder 4, which can be opened and closed at one end, is in the open state, the portion of the writing shaft 2 near the pen tip 2a comes into contact with the elastic restoring force of the inner cylinder part 4, which can be opened and closed at one end, and the inner surface of the tip 1a of the outer cylinder 1. Due to the elastic restoring force of the elastic contact pieces 12a and 12b, the inner cylinder 4 is supported in pressure contact between the openable and closable ends, so that there is a gap between the vicinity of the pen tip 2a and the tip opening of the outer cylinder 1. 〓Even if there are gaps, there will be no wobbling when writing.

In addition, the inner cylinder 4, which can be opened and closed at one end, has a rear end flange 9.
is engaged with the inner periphery of the tip 1a of the outer cylinder 1, and the elastic contact pieces 12a, 12b at the openable and closable end are in contact with the inner surface of the tip 1a of the outer cylinder 1, thereby stabilizing the inner cylinder 4. can be supported.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a cross-sectional view of an embodiment of the cap press writing instrument of the present invention, showing the pen tip in the retracted state, Fig. 2 is a cross-sectional view of the same pen tip in the protruding state, and Fig. 3 a is the interior of the one-end closed type according to the present invention. Front view of the tube, Figure 3b
is also a plan view thereof, and FIG. 3c is a side sectional view of FIG. 1 as well.

In FIGS. 1 and 2, 1 is an outer cylinder, 2 is a writing shaft inserted into this outer cylinder 1, and 4a and 4b are elastics that cover the tip of this writing shaft 2 with a gap of 3. These are two vertically split inner cylinder portions forming an inner cylinder 4 with one end closed. Both vertically cracked inner cylindrical parts 4a, 4b
The closed end is provided with tongue-shaped elastic contact pieces 12a, 12b that press against the inner surface of the tip portion 1a of the outer cylinder 1 (see FIGS. 3a, b, and c).

Rear end flange portion 9 of both vertically split inner cylinder portions 4a, 4b
is engaged with a stepped portion formed on the inner periphery of the tip portion 1a of the outer cylinder 1. In this embodiment, the rear end portions 13 of both vertically split inner cylinder portions 4a and 4b are integrally connected, but they may be separated. In addition to the portion 14 forming the truncated conical space 3a (see FIG. 3c), the double-sided vertically split inner cylinder portions 4a and 4b of this embodiment have a portion 15 forming the cylindrical space 3b (see FIG. 3b). Although the portion 15 is provided, it is not necessary to provide the portion 15. Further, an elastic seal portion 7 that slides into contact with the writing shaft 2 is provided on the inner surface of the rear end of both vertically split inner cylinder portions 4a, 4b.

5 is a notch provided at the rear end of the writing shaft 2; 8 is a spring seat provided on the writing shaft 2; 6 is a notch provided between the spring seat 8 and the rear end 13 of both vertically split inner cylindrical portions 4a and 4b. It is a return spring.

When the notch portion 5 of the writing shaft 2 is pushed against the return spring 6, the tip of the writing shaft 2 is exposed to the inner surface of the portion 14 forming the truncated conical space 3a of the vertically split inner cylinder portions 4a, 4b. The slope 11 hits and presses it, and the elastic contact pieces 12a, 12b at the closed end that contact the inner surface of the tip 1a of the outer cylinder 1 are bent by the pressing force of the slope 11, and the inner cylinder part 4a with both longitudinal cracks is bent. , 4b is bent outward and pushed open, and the pen tip 2a of the writing shaft body 2 protrudes from both vertically split inner cylinder parts 4a and 4b (see Fig. 2).
It is held in this state by a rotating cam mechanism (not shown), and writing can be performed using the pen tip 2a of the writing shaft body 2.

When the both vertically split inner cylinder parts 4a and 4b are in the open state, the portion of the writing shaft body 2 near the pen tip 2a is affected by the elastic restoring force of the both vertically split inner cylinder parts 4a and 4b and the tip part 1 of the outer cylinder 1.
Due to the elastic restoring force of the elastic contact pieces 12a and 12b that contact the inner surface a, the closed ends of the vertically cracked inner cylinder parts 4a and 4b are pressed and supported, so that the vicinity of the pen tip 2a and the outer part are Even if there is a gap between the tip and opening of tube 1, it will not rattle when writing.

When the notch part 5 is pressed again, the holding by the rotary cam mechanism is released, and the writing shaft body 2 is returned by the spring force of the return spring 6, and both vertically split inner cylinder parts 4a, 4b and the elastic contact piece 12a at the closed end thereof are released. , 12b return to the state shown in FIG. 1 due to their elastic restoring forces, and both vertically split inner cylinder portions 4a, 4b are closed.

When the inner cylinder 4, which can be opened and closed at one end, is in the closed state, elastic contact pieces 12a and 12b are pressed against the inner surface of the tip portion 1a.
The opening/closable end is sealed with the elastic restoring force of Since the nib 2a part of the body 2 is sealed, the solvent and moisture of the ink are absorbed into the nib 2a.
The amount of evaporation and consumption can be significantly reduced, allowing for long-term writing.

In the present invention, the opening/closing end is pushed open by the pressure of the pen tip 2a, the pen tip 2a is inserted, and the pen tip 2a is inserted, and the pen tip 2a is inserted and removed to seal the writing shaft body.
By pressing the inner surface of the inner tube 4 which can be opened and closed at one end by the slope 11 of the pen and bending the inner tube 4 outward, the openable and closable end is opened, and then the pen tip 2a is inserted and pulled out. After that, it is sealed, so ink scum does not adhere to the openable end and the sealing effect is not deteriorated, and the sealing effect can be maintained for a long time. Therefore, evaporation of the ink solvent and water can be prevented, and the period during which writing can be performed can be significantly extended. It is also possible to prevent dust from entering.

In addition, when a portion 15 forming a cylindrical space 3b is provided in both inner cylindrical portions 4a and 4b in addition to the portion 14 forming a truncated conical space 3a as in this embodiment, the ink inside the writing shaft 2 This is preferable because when the amount of air is small and the amount of air is large, the internal temperature rises and the internal air expands, this expanded air can flow out into the truncated conical space 3a and the cylindrical space 3b to prevent ink from overflowing. Moreover, if a part is shaped like a truncated cone like this, the inner cylinder part 4 when the writing shaft body 2 is returned.
This is preferable because the elastic restoring force of a and 4b is increased.

The inner cylinder 4, which can be opened and closed at one end, may have a structure in which only a slit is provided at the closed end, as shown in FIG.

[Effect of idea]

As described above, according to the present invention, the inner tube 4, which can be opened and closed at one end, is made of an elastic body and has elastic contact pieces 12a and 12b, which are in pressure contact with the inner surface of the tip 1a of the outer tube 1, at the openable and closable end. The inner cylinder 4 has a rear end collar 9 and an elastic seal part 7 on the inner surface of the rear end.
are engaged and slid into contact with the inner periphery of the tip 1a of the outer cylinder 1 and the writing shaft body 2, respectively, so that when the inner cylinder 4, which can be opened and closed at one end, is in the closed state, the elastic material pressed against the inner surface of the tip 1a The elastic restoring force of the contact pieces 12a and 12b seals the openable and closable end, and the inner cylinder 4 can be opened and closed at one end by the slope 11 of the writing shaft body 2.
The openable end is opened by pressing the inner surface of the inner cylinder 4 to bend the inner cylinder 4 outward, and then the pen tip 2 is opened.
After inserting a and pulling it out, it will be sealed, and the sealing effect will not deteriorate due to ink scum sticking to the end that can be opened and closed, and that it can be maintained for a long period of time. The elastic seal part 7 on the inner surface of the rear end of the cylinder 4 seals the space between the pen tip 2 of the writing shaft 2 and the writing shaft 2.
Since part a is sealed, the evaporation of the ink solvent and moisture can be prevented, the writing period can be significantly extended, and the intrusion of dust can be prevented.

Further, when the inner cylinder 4, which can be opened and closed at one end, is in the open state, the portion of the writing shaft 2 near the pen tip 2a is pressed against the elastic restoring force of the inner cylinder 4, which can be opened and closed at one end, and the inner surface of the tip 1a of the outer cylinder 1. Due to the elastic restoring force of the elastic contact pieces 12a and 12b, the inner cylinder 4 is supported in pressure contact between the openable and closable ends, so that there is a gap between the vicinity of the pen tip 2a and the tip opening of the outer cylinder 1. 〓 Not only is it easier to write because there is no wobbling when writing even if there is a gap, but the inner tube 4, which can be opened and closed at one end, has a rear end collar 9 that is engaged with the inner periphery of the tip 1a of the outer tube 1. The inner cylinder 4 can be stably supported because the elastic contacts 12a and 12b at the openable and closable ends are in pressure contact with the inner surface of the tip portion 1a of the outer cylinder 1.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the cap press writing instrument of the present invention, showing the pen tip in the retracted state, Fig. 2 is a cross-sectional view of the same pen tip in the protruding state, and Fig. 3 a is the interior of the one-end closed type according to the present invention. Front view of the tube, Figure 3b
3c is a plan view of the same, FIG. 3c is a side sectional view of FIG. 1, FIG. 4 is a sectional view of an example of a conventional cat press writing instrument with the nib stored, and FIG. Sectional view shown in the state, No. 6
The figure is a side sectional view showing another example of the one-end closed type inner cylinder according to the present invention. 1...Outer cylinder, 1a...Tip, 2...Writing shaft body, 2a...Nib, 3...Between, 4...Inner cylinder that can be opened and closed at one end, 4a, 4b...Vertical split inner cylinder Part, 5
. . . Knot portion, 6 . 15...A portion forming the cylindrical space 3b.

Claims (1)

[Scope of utility model registration request] A writing shaft 2 is inserted into the outer cylinder 1, an inner cylinder 4 that can be opened and closed at one end is provided, covering the tip of the writing shaft 2 with a gap 3, and the notch portion 5 of the writing shaft 2 is returned. After the inner surface of the inner tube 4, which can be opened and closed at one end by pushing against the spring 6 or returning by the spring force, is pressed by the slope 11 of the writing shaft 2 and deflected outward, the inner tube 4 is opened. , a cap press writing instrument in which the inner cylinder 4 is closed after the pen nib 2a is inserted or the pen nib 2a is retracted; Tip part 1
The inner cylinder 4 is made of an elastic body and has elastic contact pieces 12a and 12b that are in pressure contact with the inner surface.The inner cylinder 4 has one end that can be opened and closed. 1 and the inner periphery of the tip 1a and the writing shaft 2, and the inner cylinder 4
When the inner cylinder 4 and its elastic contact pieces 12a,
12b, a portion of the writing shaft 2 in the vicinity of the pen tip 2a is supported under pressure between the openable and closable ends of the inner cylinder 4.