JP7269086B2 - writing instrument - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument that guides ink contained in an ink containing portion forward and discharges it from the front end side of an ink guide core.

Conventionally, in this type of invention, as described in Patent Document 1, for example, a shaft cylinder, a long shaft-shaped ink occlusion body supported in the shaft cylinder, and a front end side of the ink occlusion body connected to the ink occlusion body. The pen body (ink guide core) is provided with a pen body (ink guide core) projecting forward from the front end of the barrel, and the ink impregnated in the ink absorbing body is guided forward by capillary force and discharged from the front end side of the pen body. There are writing instruments such as felt-tip pens and marker pens.
The pen body of such a writing instrument is formed of, for example, a bundle of fibers, a porous synthetic resin material, or the like, so as to guide ink forward by capillary force.

JP-A-2000-79787

According to the above-described prior art, the ink guide core, which is a pen body, is repeatedly brought into contact with or pressed against the writing surface during writing. There is a risk that the tip side of the ink guide core will be damaged, such as the fibers that make up the ink guide core will come loose.

In view of such problems, the present invention comprises the following configurations.
a cylindrical slider that is inserted forward and backward through the barrel and protrudes forward from a front end of the barrel; and a writing part that protrudes forward from the front end of the slider and is inserted forward and backward through the slider. and a first biasing member that biases the slider rearward with respect to the shaft cylinder, the ink guide core having a rear end side supported in the shaft cylinder, A cam slope is provided on one side and a sliding contact portion that slides on the cam slope is provided on the other side. The slider is moved forward with respect to the ink guide core and the shaft cylinder , and the ink guide core is provided with an ink containing section for supplying ink to the ink guide core on the rear end side of the ink guide core. The ink containing portion is connected to the core so as to move forward and backward integrally. A gap is secured between the outer peripheral surface and the inner peripheral portion of the shaft cylinder and the outer peripheral portion of the case portion so that the inner peripheral portion of the shaft cylinder and the outer peripheral portion of the case portion are pressed against each other. A writing utensil characterized by comprising a seal portion that seals a gap at its front end side .

Since the present invention is configured as described above, it is possible to prevent the tip side of the ink guide wick from being damaged by excessive writing pressure.

1 is a half cross-sectional view showing an example of a writing instrument according to the present invention; FIG. FIG. 2 is an enlarged full cross-sectional view of the main part of the writing instrument; It is a perspective view showing the front end side portion of the front axle. 4 is a perspective view showing the front end side portion of the case portion in the ink containing portion; FIG. It is a full cross-sectional view showing the action of the writing instrument, (a) shows a normal use state, (b) shows a state in which the slider is advanced, and (c) shows a state in which the ink guide core is retracted. . In addition, the hatching of (b) and (c) indicates the portion advanced or retreated with respect to the state of (a). (a) shows a normal writing state, and (b) shows a state in which the slider is advanced by radial force applied to the ink guide core. In addition, hatching in (b) indicates a portion advanced with respect to the state in (a). (a) shows a state in which the ink guide lead is brought into contact with the writing surface substantially perpendicularly, and (b) shows a state in which the ink guide lead is retracted due to an excessive force in a generally vertical direction. Incidentally, the hatching in (b) indicates a relatively retreated portion with respect to the state in (a).

The present embodiment discloses the following features.
A first feature is a barrel, a tubular slider that is inserted into the barrel so that it can move back and forth and protrudes forward from a front end of the barrel, and a writing part that protrudes forward from the front end of the slider and attaches to the slider. an ink guide core that is inserted forward and backward and whose rear end side is supported in the shaft cylinder; and a first biasing member that biases the slider backward with respect to the shaft cylinder. one of the sliders is provided with a cam slope and the other is provided with a sliding contact portion that slides on the cam slope;
A force component in the radial direction transmitted from the ink guide core to the slider brings the cam slope into sliding contact with the sliding contact portion, thereby advancing the slider with respect to the ink guide core and the shaft cylinder ( 1 to 6).

The second feature is that the slider tilts as it advances, and the ink guide core is elastically bent along with this tilt (see FIGS. 5(b) and 6).

A third feature is that at least one of the cam slope and the sliding contact portion is provided with a ventilation groove that communicates with the inside and outside of the shaft cylinder, and the outside air flows through the ventilation groove as the ink is ejected from the writing portion. It was made to flow into the barrel through the groove (see FIGS. 2 to 4).

As a fourth feature, the ink containing portion for supplying ink to the ink guiding core is connected to the rear end side of the ink guiding core so as to advance and retreat integrally with the ink guiding core. is supported in the shaft cylinder so as to advance and retreat by a predetermined amount between an advanced position and a retracted position, and a second biasing member is provided in the shaft cylinder to bias the ink containing portion forward. provided (see FIGS. 5(c) and 7).

As a fifth feature, the ink containing portion includes a cylindrical case portion in which the ink guide core is inserted through a front end opening, a tail plug portion closing the rear end side of the case portion in a bottomed manner, and the and an ink-impregnated body connected to the rear end side of the ink guide core in the case portion, and the ink containing portion moves forward and backward between the inner peripheral surface of the shaft cylinder and the outer peripheral surface of the case portion. A seal portion is formed between the inner peripheral portion of the shaft cylinder and the outer peripheral portion of the case portion so as to be press-contacted in the front-rear direction to seal the gap at the front end side. (see Figures 1 to 5).

As a sixth feature, the slider has a collar on the front end side of the cam slope, which protrudes radially outward from the inner edge of the opening at the front end of the barrel and can come into contact with the front end surface of the barrel (Fig. 2).

It should be noted that the embodiments described later also disclose inventions in which only the following constituent requirements are essential.
That is, one aspect of the present invention includes a barrel, a cylindrical slider that is inserted into the barrel so that it can move back and forth and protrudes forward from the front end of the barrel, and a writing part that protrudes forward from the front end of the slider. a writing lead that is inserted into the slider so that it can move back and forth and whose rear end side is supported in the barrel; and a first biasing member that biases the slider rearward with respect to the barrel. One of the cylinder and the slider is provided with a cam slope, and the other is provided with a sliding contact portion that slides on the cam slope. A writing instrument in which the slider is moved forward with respect to the writing lead and the barrel by sliding contact with the sliding contact portion, wherein the slider is provided on the front end side of the cam slant surface and is disposed on the inner edge of the opening at the front end of the barrel. and a brim that protrudes radially outward from the portion and can abut against the front end face of the barrel.
Here, the writing lead includes an ink guide lead for a felt pen, a refill for a ballpoint pen, a lead lead for a mechanical pencil, and the like.
According to this invention, it is possible to prevent the slider from retreating and biting into the front end opening of the barrel.

<Specific embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings.
The writing instrument 1 includes a barrel 10, a cylindrical slider 20 that is inserted into the barrel 10 so as to be able to move back and forth and protrudes forward from the front end of the barrel 10, and a slider 20 that biases the slider 20 backward with respect to the barrel 10. one urging member 27; an ink guide core 30 having a writing part 31 protruding forward from the front end of the slider 20 and inserted into the slider 20 so as to advance and retreat, the rear end side of which is supported in the barrel 10; An ink containing portion 40 connected to the rear end side of the ink guiding core 30 so as to advance and retreat integrally with the ink guiding core 30; 47, and constitutes a felt pen (including felt-tip pens, marker pens, marking pens, etc.) that transfers ink by bringing the writing part 31 on the front end side of the ink guide core 30 into contact with the writing surface x.
In this writing instrument 1, the cam slope 21a on the side of the slider 20 is brought into sliding contact with the sliding contact portion 11a on the side of the barrel 10 by the force component in the radial direction transmitted from the ink guide core 30 to the slider 20, so that the slider 20 is guided by the ink. It is advanced with respect to the core 30 and barrel 10 .

The barrel 10 is configured by connecting a substantially tubular front axle 11 and a rear axle 12 in the front-rear direction.
As other examples of the shaft tube 10, it is possible to adopt a mode in which a single cylindrical member is formed, or a mode in which three or more cylindrical members are connected.

The front shaft 11 is formed in a long cylindrical shape having openings at its front and rear ends, and the inner edge of the opening at its front end serves as a sliding contact portion 11a for sliding contact with a cam slope 21a, which will be described later.
Specifically, as shown in FIG. 2, a C-chamfered portion is formed on the inner edge of the front end of the front barrel 11, and the C-chamfered portion intersects with the inner peripheral surface of the front end of the front barrel 11. The corner portion is the sliding contact portion 11a. This sliding contact portion 11 a is provided in a substantially annular shape along the inner peripheral surface of the front shaft 11 .

A plurality of ventilation grooves 11d communicating with the inside and outside of the barrel 10 are provided in the sliding contact portion 11a at intervals in the circumferential direction (see FIGS. 2 and 3).
Each ventilation groove 11d includes a cutout portion 11d1 formed by partially cutting the front end portion of the front shaft 11, and a recessed groove portion 11d2 communicating with the cutout portion 11d1 and extending rearward along the inner peripheral surface of the front shaft 11. consists of
The vent groove 11 d allows external air to flow into the barrel 10 as ink is ejected from the writing section 31 .

Further, an annular stepped portion whose diameter decreases forward is provided on the inner peripheral surface of the front shaft 11 behind the slider 20 . An inner edge portion 11b of this stepped portion is formed in a convexly curved vertical cross-section over the entire circumference (see FIG. 2), and constitutes a seal portion a, which will be described later.

The rear axle 12 is formed in a bottomed tubular shape with the rear as the bottom, and is connected to the rear end side of the front axle 11 by well-known connecting means (for example, screwing, fitting, etc.).

In FIG. 2, reference numeral 11c denotes a stepped engaging portion which is formed on the inner peripheral surface of the front shaft 11 and receives the front end portion of the first biasing member 27. As shown in FIG.
Further, in FIG. 1, reference numeral 13 denotes a cap airtightly covered on the front end side of the front barrel 11 to protect the writing section 31 and prevent volatilization of ink. The cap 13 is formed in a bottomed cylindrical shape with the front as the bottom.

Further, the slider 20 is integrally composed of two members, a slider main body portion 21 and a receiving portion 22 connected to the rear side of the slider main body portion 21 . These members can also be a single member.
The outer peripheral surface of the slider main body 21 is provided with a cam slope 21a and an annular flange 21b protruding radially outward from the inner edge of the opening at the front end of the barrel 10 on the front end side of the cam slope 21a.

The cam slope 21a is an annular slope whose diameter gradually increases toward the front. When a force component in the radial direction is applied to the slider 20, the cam slope 21a slides in contact with the sliding contact portion 11a on the side of the barrel 10 and functions as a movement direction changing means for moving the slider 20 forward.

The collar portion 21b has a rear end surface 21b1 (see FIG. 2) substantially perpendicular to the axis of the slider 20, and the rear end surface 21b1 can contact the front end surface of the barrel 10. As shown in FIG.

The slider 20 configured as described above is urged rearward by the first urging member 27 .
According to the illustrated example, the first biasing member 27 is a compression coil spring, and its front end is locked to the locking portion 11c inside the barrel 10, and its rear end is locked to the receiving portion 22. As a result, the slider 20 is urged rearward.

The ink guide core 30 is a bundled body in which a large number of synthetic resin fibers (for example, acrylic fibers, etc.) are bundled into a rod shape, and guides the ink supplied from the ink-impregnated body 43 on the rear side forward by capillary action, is discharged from the writing section 31 of the . According to the illustrated example, the writing section 31 is formed in a cannonball shape (or a parabolic shape in longitudinal section).

An annular stepped portion 32 is formed on the outer peripheral surface of the ink guide core 30 so as to reduce the diameter of the rear portion. The stepped portion 32 contacts the front end portion of the ink containing portion 40 .

The ink containing portion 40 is supported in the barrel 10 so as to advance and retreat by a predetermined amount between an advanced position (see FIGS. 5A and 5B) and a retracted position (see FIG. 5C).
The ink containing portion 40 is connected to a long cylindrical case portion 41 , a tail plug portion 42 covering the rear end side of the case portion 41 in a bottomed manner, and the rear end side of the ink guide core 30 . and an ink-impregnated body 43 housed in the case portion 41 .

Between the outer peripheral surface of the ink containing portion 40 and the inner peripheral surface of the shaft tube 10, a gap s that allows the ink containing portion 40 to move forward and backward is secured in a cylindrical shape extending in the front-rear direction.
Between the inner peripheral portion of the shaft tube 10 and the outer peripheral portion of the case portion 41, there is formed a seal portion a which is press-contacted in the front-rear direction to seal the gap s at the front end side thereof.

As shown in FIG. 2, the seal portion a is formed by press-contacting the inner edge portion 11b of the annular stepped portion on the inner peripheral surface of the shaft cylinder 10 and the annular inclined surface 41a on the outer peripheral portion of the case portion 41. The gap s on the rear side is sealed.

The case portion 41 is formed in a long, substantially cylindrical shape, and includes a long cylindrical small-diameter cylindrical portion 41b located on the front side of the seal portion a, and a large cylindrical portion 41b that annularly surrounds the rear side of the small-diameter cylindrical portion 41b. It has a diameter cylindrical portion 41c, an accommodation chamber 41e that accommodates the ink-impregnated body 43 on the rear side of the large diameter tubular portion 41c, and an air passage 41d that communicates the accommodation chamber 41e with a space on the front end side inside the shaft cylinder 10.

The small-diameter cylindrical portion 41b is annularly fitted to the rear end side of the stepped portion 32 on the outer periphery of the ink guide core 30 . An elastic member 45 is annularly fitted around the outer periphery of the small-diameter cylindrical portion 41b.

The large-diameter tubular portion 41c is provided in a tubular shape with an annular gap 41d2 between it and the outer peripheral surface of the small-diameter tubular portion 41b, and has a plurality of notches 41d1 spaced apart in the circumferential direction on its front end side. . The gap 41d2 and the notch 41d1 function as part of an air passage 41d, which will be described later.

A partition wall 41f is placed between the storage chamber 41e and the gap 41d2 in the large-diameter cylindrical portion 41c to secure a long cylindrical space for storing the ink-impregnated body 43 on the rear side thereof. . A plurality of through holes 41d3 are provided in the partition wall 41f at intervals in the circumferential direction. These through-holes 41d3 function as part of an air passage 41d, which will be described later.

The air passage 41d is an air passage formed by the notch 41d1, the gap 41d2, and the through hole 41d3, and communicates the front end space in the barrel 10 with the housing chamber 41e.

The elastic member 45 is an O-ring made of an elastic material such as synthetic rubber. The elastic member 45 is elastically deformed while being sandwiched between the rear end of the receiving portion 22 and the front end of the large-diameter tubular portion 41c.

Also, the tail plug portion 42 is formed in a bottomed cylindrical shape with the rear end as the bottom portion. The tail plug portion 42 is detachably connected to the rear end side of the case portion 41 so as to close the rear end opening of the case portion 41 . This connecting means may be, for example, screwing or fitting.
An annular locking protrusion 42a is provided on the outer periphery of the tail plug portion 42 to contact the rear end portion of the case portion 41 and receive the front end portion of a second biasing member 47, which will be described later.

The ink-impregnated body 43 is formed by arranging a large number of synthetic resin fibers in the shape of a cylindrical shaft and impregnating it with ink.
The ink-impregnated body 43 is attached to the case portion 41 and the tail plug portion 42 so that the front end portion is in contact with the stepped portion in the case portion 41 and the rear end portion is fitted to the tail plug portion 42 so as to be unable to advance or retreat. be.
As another example of the ink-impregnated body 43, it is possible to employ a mode in which ink is directly sealed in a substantially cylindrical tank.

The second biasing member 47 is a compression coil spring mounted on the inner rear end side of the barrel 10 . The second biasing member 47 is annularly fitted around the outer periphery of the tail plug portion 42, and has its front end abutted against the locking protrusion 42a of the tail plug portion 42, and its rear end portion 12, the ink containing portion 40 is biased forward against the shaft cylinder 10. As shown in FIG.
The urging force of the second urging member 47 is such that when an excessive backward force is applied to the writing portion 31, the writing portion 31, the ink containing portion 40, etc. are moved backward relative to the barrel 10. , is set accordingly.

Next, the characteristic functions and effects of the writing instrument 1 having the above configuration will be described in detail.
As shown in FIG. 6A, when the writing portion 31 contacts the writing surface x at an appropriate writing angle, the ink ejected from the writing portion 31 is transferred to the writing surface x.
Outside air is introduced into the barrel 10 as the ink is consumed during writing. More specifically, the outside air passes through the ventilation groove 11d on the front end side of the front shaft 11, the space on the front end side inside the front shaft 11, and the ventilation path on the front end side of the case portion 41, as indicated by the two-dot chain line in FIG. 41d to enter the containment room 41e.

When an excessive force is applied to the writing portion 31 in the radial direction, such as when the writing portion 31 is strongly obliquely pressed against the writing surface x during writing, the cam slope 21a of the slider 20 slides on the sliding contact portion. The slider 20 moves forward in sliding contact with 11a (see FIGS. 5(b) and 6(b)). Therefore, the writing part 31 can be covered and protected by the advanced slider 20 .

During the forward movement, the slider 20 is slightly tilted as it advances, but the front end side of the ink guide core 30 is elastically bent to follow this tilt (see FIG. 6(b)). Therefore, the slider 20 can be smoothly moved forward by reducing the resistance that the slider 20 receives from the ink guide core 30 .

When the force in the radial direction is removed, the slider 20 is retracted by the biasing force of the first biasing member 27, and the initial state in which the writing part 31 protrudes from the front end of the slider 20 (see FIG. 5(a)). ) and FIG. 6(a)).
Since the rear end portion of the slider 20 abuts against the elastic member 45 during the retreat, it is possible to reduce noise and the like associated with the retreat.

Further, for example, when the writing portion 31 is strongly pressed against the writing surface x in a substantially perpendicular direction, if an excessive backward force is applied along the axial direction, the ink guide core 30 and the ink containing portion 40 And the elastic member 45 and the like retreat against the biasing force of the second biasing member 47, and the writing section 31 is retracted into the slider 20 (see FIG. 7(b)). Therefore, it is possible to prevent the fibers of the ink guide core 30 from fraying or the writing part 31 from losing its shape due to an excessive backward pressing force.

When the force in the vertical direction is removed, the ink guide core 30, the ink containing portion 40, the elastic member 45, etc. move forward due to the biasing force of the second biasing member 47, and the writing portion 31 moves toward the slider. 20 returns to its initial state (see FIGS. 5(a) and 6(a)).
During the forward movement, the elastic member 45 abuts against the rear end of the slider 20, so that the noise associated with the forward movement can be reduced.

Further, according to the writing instrument 1 configured as described above, it is possible to prevent the writing part 31 from drying due to air remaining in the barrel 10 .
More specifically, in a normal writing instrument, even when the cap is attached to the front end of the barrel, the remaining air in the barrel gradually dries the writing part, the ink guide lead, and the like. However, according to the writing instrument 1 of the present embodiment, since the gap s on the rear end side inside the barrel 10 is sealed by the seal portion a, the residual air in the gap s is prevented from flowing forward inside the barrel 10. In addition, drying of the writing part 31, the ink guide core 30, and the like can be prevented.

Further, according to the writing instrument 1 configured as described above, when the slider 20 receives an excessive rearward force, the rear end surface 21b1 of the collar portion 21b of the slider main body portion 21 contacts the front end surface of the barrel 10. It is possible to prevent the slider main body 21 from retreating and biting into the barrel 10.例文帳に追加

According to the above embodiment, the cam slope 21a is provided on the slider 20 side and the sliding contact portion 11a is provided on the barrel 10 side. It is also possible to provide a sliding contact portion that makes sliding contact with the slope on the slider 20 side.

Further, according to the above-described embodiment, the ventilation groove 11d communicating between the inside and outside of the barrel 10 is provided in the sliding contact portion 11a. be.

Further, according to the above embodiment, the writing instrument 1 is configured as a felt pen, but as another example, it is possible to configure the writing instrument 1 as a ballpoint pen. In this case, the ink guide core 30, the ink containing portion 40, and the like may be replaced with a ballpoint pen refill.

Moreover, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

1: Writing instrument 10: Axle tube 11a: Sliding contact part 20: Slider 21a: Cam slope 27: First biasing member 30: Ink guide core 31: Writing part 40: Ink storage part 41: Case part 42: Tail plug part 43: Ink-impregnated body 47: Second biasing member s: Gap

Claims (8)

a cylindrical slider that is inserted forward and backward through the barrel and protrudes forward from a front end of the barrel; and a writing part that protrudes forward from the front end of the slider and is inserted forward and backward through the slider. and an ink guide core whose rear end side is supported in the shaft cylinder, and a first biasing member that biases the slider backward with respect to the shaft cylinder,
one of the shaft cylinder and the slider is provided with a cam slope and the other is provided with a sliding contact portion that makes sliding contact with the cam slope,
a force component in a radial direction transmitted from the ink guide core to the slider brings the cam slope into sliding contact with the sliding contact portion to move the slider forward with respect to the ink guide core and the shaft cylinder;
an ink containing portion for supplying ink to the ink guide core is connected to the rear end side of the ink guide core so as to advance and retreat integrally with the ink guide core;
The ink containing portion has a cylindrical case portion in which the ink guide core is inserted through a front end opening,
A gap is provided between the inner peripheral surface of the shaft cylinder and the outer peripheral surface of the case portion to allow the ink containing portion to move forward and backward,
A writing utensil according to claim 1, wherein a seal portion is formed between the inner peripheral portion of the barrel and the outer peripheral portion of the case portion so as to seal the gap at the front end thereof by being pressed in the front-rear direction. 2. The writing instrument according to claim 1, wherein said slider inclines while moving forward, and said ink guide core is elastically bent in accordance with this incline. At least one of the cam slope and the sliding contact portion is provided with a ventilation groove that communicates with the inside and outside of the shaft cylinder. 3. A writing instrument according to claim 1 or 2, characterized in that the writing instrument is adapted to flow into the barrel. 3. The slider has a collar on the front end side of the cam slope, which protrudes radially outward from the opening inner edge of the front end of the barrel and can come into contact with the front end surface of the barrel. The writing instrument according to any one of 1 to 3. a cylindrical slider that is inserted forward and backward through the barrel and protrudes forward from a front end of the barrel; and a writing part that protrudes forward from the front end of the slider and is inserted forward and backward through the slider. and an ink guide core whose rear end side is supported in the shaft cylinder, and a first biasing member that biases the slider backward with respect to the shaft cylinder,
one of the shaft cylinder and the slider is provided with a cam slope and the other is provided with a sliding contact portion that makes sliding contact with the cam slope,
a force component in a radial direction transmitted from the ink guide core to the slider brings the cam slope into sliding contact with the sliding contact portion to move the slider forward with respect to the ink guide core and the shaft cylinder;
The writing instrument, wherein the slider has a flange on the front end side of the cam slope, which protrudes radially outward from the opening inner edge of the front end of the barrel and can contact the front end surface of the barrel. 6. A writing instrument according to claim 5, wherein said slider inclines while moving forward, and said ink guide core is elastically bent in accordance with this incline. At least one of the cam slope and the sliding contact portion is provided with a ventilation groove that communicates with the inside and outside of the shaft cylinder. 7. A writing instrument according to claim 5 or 6, characterized in that it flows into the barrel. an ink containing portion for supplying ink to the ink guide core is connected to the rear end side of the ink guide core so as to advance and retreat integrally with the ink guide core;
The ink containing portion is supported within the shaft cylinder so as to advance and retreat by a predetermined amount between an advanced position and a retracted position,
8. The writing instrument according to any one of claims 5 to 7, wherein a second biasing member that biases the ink containing portion forward is provided in the barrel.

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