JPH0872470A - Capless pen - Google Patents

Abstract

PURPOSE: To obtain a capless pen having structure of easy assembly by advancing a refill by knocking action to project from a pen core and delivering ink to the pen core by the pressing movement of the pen core after the ink being retained temporarily. CONSTITUTION: A fixed cylinder 3 is fixed in the front inner hole of a shaft cylinder 1, and a sliding cylinder 4 is installed movably back and forth in the front inner hole of the fixed cylinder 3. A lid part 5 is pivoted on the outside of the end of the fixed cylinder 3 to contact closely the surface of the end of the sliding cylinder 4. A refill 7 is mounted bondably at the position of retreating back and forth to the shaft cylinder 1 to contact closely and slidingly the inner circumferential surface of the siding cylinder 4 on the outer circumference of its tip part 18. Springs 21, 22 are energized between the refill 7 and the sliding cylinder and between the refill 7 and the fixed cylinder 3, a lid part 4 is opened with the sliding cylinder 4 interlocked by the advance of the refill 7, and a pen core 20 is made to protrude from the end opening 1a of the shaft cylinder 1. Bonding parts are installed in the inner hole of the sliding cylinder 4 and on the outer circumference of the tip of the refill 7, and the pen core 20 is moved backward and closed by the retreat of the refill 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a capless liquid writing instrument equipped with a volatile ink such as a marker or a felt-tip pen.

[0002]

2. Description of the Related Art Conventionally, a writing instrument equipped with a volatile ink such as a marker or a felt-tip pen is provided with a cap for sealing a pen tip. Therefore, there are problems such as the trouble of attaching and detaching the cap and the loss of the cap. Many capless writing instruments are known to solve such a problem, but few have surely overcome the sealing property. Also, there is a sealing device having a reliable sealing property as in the present application, which is sealed by an opening / closing lid, but has a complicated structure and is difficult to assemble. In addition, since the pen core contacts the inner surface of the lid when the lid is opened and closed, ink adheres to the inner surface of the lid, and the outer circumference of the tip with the pen core attached to the inner surface of the lid is rubbed. There is a problem that when the tip portion projects from the tip opening of the barrel, the tip opening is soiled and the hands and clothes are soiled.

[0003]

SUMMARY OF THE INVENTION The present invention can provide a capless liquid writing instrument that solves the above problems. Further, it is possible to provide a capless liquid writing instrument in which the remaining amount of ink can be known.

[0004]

SUMMARY OF THE INVENTION A capless liquid writing instrument of the present invention devised to achieve the above object,
The fixed cylinder 3 is fixed to the front inner hole of the shaft cylinder 1, the sliding cylinder 4 is disposed in the front inner hole of the fixed cylinder 3 so as to be movable back and forth, and the lid portion 5 slides on the outer surface of the front end of the fixed cylinder 3. The refill 7 for the liquid writing instrument is formed in close contact with the tip end surface of the cylinder 4, and is inserted into the inner hole of the sliding cylinder 4, and the refill 7, the sliding cylinder 4, and the refill 7 are inserted.
The springs 21 and 22 are urged between the fixed cylinder 3 and the fixed cylinder 3, and the sliding cylinder 4 is interlocked with the forward movement of the refill 7 to open the lid portion 5 and the sliding cylinder 4 is restricted from moving forward. Only the refill 7 moves forward to bring the pen core 20 into a protruding state from the tip end 1a, and when the refill 7 retreats, the sliding cylinder 4 is interlocked from the state where the pen core 20 is retracted into the inner hole of the sliding cylinder 4. The pen core 20 is sealed by bringing the lid 5 into close contact with the tip end surface of the sliding cylinder 4 while retracting the pen core 20. The refill 7 is an ink container 8
Via the tip shaft 16 provided at the tip of the ink containing cylinder 8, the ink holder 14 fitted in the tip shaft 16, the valve mechanism portion 9 provided in the ink chamber opening, and the valve mechanism portion 9. And the holding portion 18 in the front shaft 16
c and a pen core 20 inserted and held in the ink holder 14. At least the ink containing cylinder 8 of the shaft cylinder 1 and the refill 7 is formed of a transparent resin molded product.

[0005]

1 to 7 show an embodiment of a capless liquid writing instrument of the present invention. First, as shown in FIGS. 1 and 2, the capless liquid writing instrument of the present application is a writing instrument on which ink such as a marker and a felt-tip pen is mounted.
A fixed cylinder 3 is fixed to a front inner hole of a shaft cylinder 1 having a tip opening 1a. The fixed cylinder 3 is a tubular body, and a step portion 3b is provided at the tip of the inner hole of the large diameter portion fixed to the shaft cylinder 1, and a sliding cylinder 4 described later is restricted at the rear end of the inner hole of the medium diameter portion in front of the fixed portion 3. An inward projection locking portion 3c is formed to prevent it from coming off, and a step portion 3a is formed at the front end of the inner hole.
Is formed, and is further provided in front of the middle diameter portion with a slightly smaller diameter and an inclined surface at the tip. Further, a shaft supporting portion 3d for mounting a lid portion 5 which will be described later is formed on one side surface of the small diameter portion.

The sliding cylinder 4 is a tubular body, and has a circumferential flange 4b on the rear outer periphery and an inclined surface on the front end. The sliding cylinder 4 is fitted into the middle diameter part and the small diameter part of the fixed cylinder 3,
The collar portion 4b is elastically inserted into the front end of the locking portion 3c so as to be retained and locked, and the front cylinder portion is fitted into the inner hole of the small diameter portion of the fixed cylinder 3. Further, the collar portion 4b is in circumferential contact with the inner hole of the medium diameter portion so as to be movable back and forth. The front end of the sliding cylinder 4 is provided so as to project slightly from the front end of the fixed cylinder 3 at the position where the sliding cylinder 4 is restricted from moving backward. Further, an engaging portion 4a of an inward projection is formed in the inner hole at the front of the tubular portion.

By the way, one end of the lid portion 5 is rotatably supported by a pivotal support portion 3d provided on one side surface of the small diameter portion of the fixed barrel 3 via a hinge spring 6 (including a pin or the like if necessary). At any time, the inner surface of the lid 5 is in close contact with the front end surface of the sliding cylinder 4.

On the other hand, FIGS. 6 and 7 show a refill 7 used in the capless liquid writing instrument of the present invention. As shown in the figure, the refill 7 includes an ink container 8 having an ink chamber 8a, and a front shaft 16 having a holding portion 18c provided by screwing at the tip of the ink container 8.
A valve mechanism 9 provided in the opening of the ink chamber 8a, a pen core 20, and an ink holder 14 fitted in the tip shaft 16. Further, on the front shaft 16, a collar portion 17 which serves as a spring receiving surface for mounting the refill 7 on the shaft cylinder 1 and urging the shaft cylinder 1 in the forward / backward position, and a step portion 17 in front of the flange portion 17 are provided.
a is provided. In addition, a circumferential groove portion 18 is formed on the outer periphery of the substantially central portion of the tip portion 18 having the holding portion 18c of the front shaft 16 in the inner hole.
b is formed, an O-ring 19 made of an elastic material is fixed in the groove portion 18c, and a protrusion locking portion 18a is formed on the outer peripheral portion of the distal end portion of the distal end portion 18.

The valve mechanism portion 9 includes a cylindrical valve seat body 10 sandwiched between the ink containing cylinder 8 and the front shaft 16, and a valve seat portion 12 provided on the tip side of the valve seat body 10. , A valve rod 11 connected to a base end of a pen core 20 which is held by a holding portion 18c of the front shaft 16 and protrudes outward, and the valve rod 11 is slidably inserted into the valve seat body 10, The base end side that bulges on the peripheral surface of the rod 11 is composed of a tapered valve portion 11a having a large diameter and a spring 15 interposed between the base spring receiver 10a of the valve seat body 10. The spring 15 has an elastic force. Therefore, the tapered valve portion 11a is always in contact with the rear end of the opening of the valve seat portion 12.

Further, in the valve mechanism section 9, the tapered valve section 11a, which is normally provided on the outer periphery of the central portion of the valve rod 11 in the longitudinal direction, is in close contact with the rear end of the valve seat section 12, and the valve seat behind the close contact section. Ink is allowed to flow into the inner hole of the body 10.
That is, the gap between the rear end of the valve rod 11 and the rear end hole of the valve seat body 10, and a slit portion (not shown) formed at a required position on the rear outer periphery of the valve seat body 10. Ink flows in from.

The pen core 20 is projected outward through the valve mechanism 9 and is held by a holding portion 18c provided in the tip shaft 16 and an ink holding body 14 fitted in the tip shaft 16. It has a structure to be inserted and held.

The ink holder 14 is composed of a cylindrical body, and the pen core 2 is provided along the entire length of the peripheral portion of the cylindrical body in the longitudinal direction.
A plurality of holding projections (not shown) for holding 0 are provided, and a concave air circulation hole (not shown) is provided between the holding projections. The ink holder 14 is made of an elastic material such as sponge, and is an ink holding device as well as a pen core 20 holding device. It also has a function as an occlusion body. Further, by arbitrarily setting the depth of the step portion of the holding protrusion of the ink holding body 14, the size of the concave air circulation hole which becomes a factor affecting the outflow of ink is determined.

By the way, the refill 7 is the pen core 2
When 0 is pushed and moved, it is transmitted to the rod shaft portion 11e at the tip of the valve rod 11 that comes into contact with the rear end of the pen core 20, and the valve rod 11 moves rearward. At the same time, the close contact between the tapered valve portion 11a and the valve seat portion 12 is released, but the rod shaft portion 11b is not
The ink does not flow into the valve seat portion 12 because it is closely inserted in the inner peripheral portion 12a of the second valve 12. Further, the valve rod 11 is retracted and the groove 1
When 1c projects from the rear end of the valve seat portion 12, ink enters the groove portion 11c. (See FIG. 7) Also, in that state, the rod shaft portion 11
Since d is closely inserted in the inner peripheral portion 12a, the ink does not flow in front of the groove portion 11c. Here, when the pressing movement of the pen core 20 is released, the state returns to the state shown in FIG. 6, and the ink that has entered the groove portion 11c is retained in the ink retaining chamber 13 formed between the groove portion 11c and the inner hole of the valve seat portion 12. At the same time, a gap formed between the rod shaft portion 11d and the inner hole of the valve seat portion 12, the rod shaft portion 11e.
Ink is supplied to the rear end of the pen core 20 through a gap formed between the inner hole of the ink holder 14 and the inner hole of the ink holder 14.

The refill 7 constructed as described above is
The barrel 1 is inserted from the rear end. At that time, a spring 22 is provided between the step portion 3b of the fixed barrel 3 and the flange portion 17 of the refill 7, and between the flange portion 4b of the sliding barrel 4 and the step portion 17a.
And the spring 21 are respectively energized.

On the other hand, FIG. 5 shows the knock cylinder 2. The knock cylinder 2 is arranged at the rear end of the refill 7, and locks the refill 7 at the front retracted position with respect to the shaft cylinder 1. As shown in the figure, the slitting portion 2 is provided in front of the knock cylinder 2.
The elastic piece 2b displaceable in the diameter reducing direction by a, the operating portion 2c bulging in a substantially T-shape on the outer periphery of the elastic piece 2b, and the T-shaped vertical portion on at least one side of the base 2g. A rib 2d having a sloped surface 2e facing a horizontal portion having a V shape is formed, and a guide groove 2h narrowing toward the rear and a locking step 2f are formed at the rear end of the rib 2d. Also, a step portion 2j that accommodates the rear end portion of the refill 7 and is in contact with the rear end portion
The inner cylindrical portion 2i having

Further, the rear outer periphery of the shaft cylinder 1 is shown in FIGS.
As shown in FIG. 2, a window portion 1b into which the T-shaped horizontal portion of the operation portion 2c can be fitted from the rear side, and a slit portion 1d in which a T-shaped vertical portion is slidably fitted in front of the window portion 1b. Further, window portions 1e through which ribs 2d can penetrate and a T-shaped horizontal portion cannot penetrate are provided in front of it, and the knock cylinder 2 accommodates the rear end portion of the refill 7. Then the barrel 1
The operation portion 2c is elastically inserted from the rear end hole so that the operating portion 2c extends through the window portion 1b and the retracted position is regulated. At the forward position of the refill 7, the locking step portion 2f of the rib 2d is located at the rear end portion of the window portion 1e. The pen core 20 is configured to be locked to the portion 1f and to be in a protruding state from the tip end port 1a of the barrel 1.

[0017]

The capless liquid writing instrument of the present invention is constructed as described above. When not in use, the tip end surface of the sliding cylinder 4 is brought into close contact with the lid 5 as shown in FIG. Since 19 is brought into close contact with the inner peripheral surface 4c of the sliding cylinder 4, the pen tip 20 is sealed in the small space (small chamber) of the sliding cylinder 4, and the evaporation of ink and the drying of the pen core 20 are prevented. Next, when the refill 7 is advanced by the knocking action of the knock cylinder 2, the sliding cylinder 4 is interlocked and advanced by the urging force of the spring 21, the lid portion 5 is expanded, and the collar portion of the sliding cylinder 4 is expanded. 4b comes into contact with the stepped portion 3a of the fixed barrel 3 to prevent the sliding barrel 4 from moving forward, and only the refill 7 further moves forward so that the pen core 20 projects from the tip opening 1a of the shaft barrel 1. (See FIG. 2) Therefore, since the pen core 20 projects from the tip end port 1a without contacting the lid part 5 at all, there is no problem that ink adheres to the lid part 5 and the tip end port 1a.

Further, the knock cylinder 2 is elastically inserted from the rear end hole of the shaft cylinder 1, and the operating portion 2c has the window portion 1 as shown in FIG.
It is set at a position where the refill 7 extends backward from b. In this state, the locking stepped portion 2f of the operation portion 2c is locked in the window portion 1b.
The knock cylinder 2 is locked so as not to come out rearward by coming into contact with the step portion 1c at the rear end, but when the operating portion 2c is pressed into the shaft cylinder, its erasing is released and the operation portion 2c is locked inside the shaft cylinder. It becomes possible to pull out the knock cylinder 2 from the shaft cylinder 1 in a state where the refill 7 is replaced.

The refill 7 used in the examples
The ink does not directly flow into the pen core side even if the valve is released by the pressing movement of the pen core 20, but the ink is temporarily stored in the ink storage chamber and then supplied to the pen core side. Therefore,
Even when the internal pressure in the ink chamber rises, the internal pressure on the pen core side does not rise. Further, the pen core is held by at least one or more holding projections provided in the longitudinal direction of the inner peripheral portion of the ink holding body fitted in the leading shaft and the holding portion in the leading shaft, and provided in the longitudinal direction inside the ink holding body. At least one or more air circulation holes provide good air replacement, and thus good ink outflow.

[0020]

The structure and operation of the capless liquid writing instrument of the present invention are as described above, and the problem that the conventional capless type is complicated and difficult to assemble is solved.
Further, since the pen core does not come into contact with the inner surface of the lid when the lid is opened and closed, ink does not adhere to the tip opening of the barrel. Therefore, it does not stain hands or clothes. In addition, the refill used is that the ink in the ink chamber is supplied quantitatively to the pen core by pressing and moving the pen core and releasing it. Since the ink is once held in the ink holding chamber and transferred to the pen core without being affected by the internal pressure on the side, the problem that the ink blows out and the surroundings are contaminated is solved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an entire capless liquid writing instrument that is an embodiment of the present invention, showing a state in which a pen core is sealed with a lid.

FIG. 2 is a vertical cross-sectional view of an embodiment showing a state in which the lid portion is opened and the pen core is projected from the tip end opening of the shaft cylinder by knocking from the state of FIG.

FIG. 3 is a vertical cross-sectional view showing a state in which the refill is removed in the example.

FIG. 4 is a top view of a barrel used in the embodiment.

FIG. 5 is a perspective view of a knock cylinder used in the embodiment.

FIG. 6 is a vertical cross-sectional view of a refill used in Examples.

FIG. 7 is a vertical cross-sectional view showing a state where the pen core of the refill shown in FIG. 6 is pressed and moved.

FIG. 8 is a cross-sectional view showing a main part of a conventional liquid writing instrument with a valve mechanism.

[Explanation of symbols]

 1 Axis cylinder 1a Tip opening 1b Window part 1c Step part 1d Slit part 1e Window part 1f Step part 2 Knock cylinder 2a Slitting part 2b Elastic piece 2c Operating part 2d Rib 2e Slope 2f Locking step part 2g Base part 2h Guide groove 2i Cylindrical part 2j Step part 3 Fixed cylinder 3a Step part 3b Step part 3c Locking part 3d Shaft support part 4 Sliding cylinder 4a Locking part 4b Collar part 4c Inner peripheral surface 5 Lid part 6 Hinge spring 7 Refill 8 Ink containing cylinder 8a Ink Chamber 9 Valve mechanism portion 10 Valve seat body 10a Spring receiver 11 Valve rod 11a Tapered valve portion 11b Rod shaft portion 11c Groove portion 11d Rod shaft portion 11e Rod shaft portion 12 Valve seat portion 12a Inner peripheral surface 13 Ink holding chamber 14 Ink retainer 15 spring 16 tip shaft 17 collar 17a step 18 tip 18a locking 18b groove 18c holding 19 O-ring 20 pen core 21 Ring 22 springs 30 ink holding device 31 ink chamber 32 writing instrument body 33 the valve mechanism portion 34 above shaft 35 ink holding member 36 holding portion 37 pen core

Claims (6)

[Claims] 1. A fixed cylinder 3 is fixed to a front inner hole of a shaft cylinder 1 having a tip opening 1a, and a fixed cylinder 3 is fixed to a front inner hole of the fixed cylinder 3.
On the other hand, a sliding cylinder 4 which is restricted to the frontward retreating position and moves back and forth is arranged, and a lid 5 is rotatably supported on the outer surface of the distal end of the fixed cylinder 3 via a hinge spring 6. 3d is provided, and at the retracted position of the sliding cylinder 4, its tip is appropriately projected from the tip of the fixed cylinder 3, and the lid portion 5 is provided.
Is in close contact with the tip surface of the sliding cylinder 4, and the refill 7 for a liquid writing instrument that can be locked in the shaft cylinder 1 at the front retracted position is the inner peripheral surface of the sliding cylinder 4. 4c is provided with a portion that slidably comes into close contact with the tip end portion 18 of the refill 7 and is inserted into the inner hole of the sliding cylinder 4 so that the refill 7 and the sliding cylinder 4 and the refill 7 and the fixed cylinder 3 are connected to each other. The spring 21 and the spring 22 are urged between them, and the sliding cylinder 4 is interlocked with the forward movement of the refill 7 to expand the lid portion 5, and the sliding cylinder 4 is moved from the state in which the forward movement position is regulated to the refill 7. Only the pen core 20 which is advanced and has its tip is the barrel 1.
The pen core 20 is projected from the tip end port 1a of the sliding barrel 4, and the pen core 20 is retracted when the refill 7 is retracted by providing locking portions on the inner hole of the sliding barrel 4 and the outer periphery of the tip end portion 18 of the refill 7. The sliding cylinder 4 is retracted from the state of being immersed in the inner hole of the sliding cylinder 4, and the lid portion 5 is brought into close contact with the tip surface of the sliding cylinder 4 to seal the pen core 20 in the small chamber of the inner hole of the sliding cylinder 4. A capless liquid writing instrument characterized by being configured to be possible. 2. In the refill 7, a circumferential groove portion 18b is provided on the outer periphery of the front end portion 18 in front of the tip shaft 16, and an O-ring 19 made of an elastic material is fixed to the outer groove portion 18b. The outer peripheral portion of the O-ring 19 is the inner peripheral surface 4 of the sliding cylinder 4.
The capless liquid writing instrument according to claim 1, wherein the liquid writing instrument is formed so as to be slidably in close contact with c. 3. The capless liquid writing instrument according to claim 1, wherein at least the ink containing cylinder 8 of the shaft cylinder 1 and the refill 7 is formed of a transparent resin molded product. 4. A knock cylinder (2) disposed at the rear end of the refill (7) for locking the refill (7) in a frontward retracted position with respect to the shaft cylinder (1), in front of the knock cylinder (2) in a diameter reducing direction. A displaceable elastic piece 2b, an operating portion 2c bulging in a substantially T shape on the outer periphery of the elastic piece 2b, and a base portion 2 serving as a T-shaped vertical portion.
A rib 2d having a sloped surface 2e facing a T-shaped horizontal portion is formed on at least one side of g, and a guide groove 2h narrowing toward the rear and a locking step 2f at the rear end of the rib 2d are formed. On the other hand, a window portion 1b into which the T-shaped horizontal portion of the operating portion 2c can be fitted from one side to the rear outer periphery of the shaft cylinder 1 from the rear side, and a T-shaped vertical portion in front of the window portion 1b. A slit portion 1d slidably fitted and a window portion 1e into which the rib 2d can extend further forward and a T-shaped horizontal portion cannot penetrate.
Are provided so as to be connected to each other, and the knock cylinder 2 is elastically inserted from the rear end hole of the shaft cylinder 1 so that the operation portion 2c is connected to the window portion 1.
At the forward position of the refill 7, the locking stepped portion 2f of the rib 2d is locked to the stepped portion 1f at the rear end of the window portion 1e so that the pen core 20 is attached to the tip of the barrel 1. End 1a
The capless liquid writing instrument according to claim 1, wherein the liquid writing instrument is configured so as to be in a protruding state. 5. The refill 7 includes an ink containing cylinder 8 having an ink chamber 8a, a leading shaft 16 having a holding portion 18c provided at the tip of the ink containing cylinder 8, and an ink fitted in the leading shaft 16. The holder 14, the valve mechanism 9 provided in the opening of the ink chamber, and the holding portion 18c in the leading shaft 16 that protrudes outward through the valve mechanism 9
2. A so-called valve-equipped liquid writing instrument, comprising: a pen core 20 inserted into and held by the ink holder 14; and the ink holder 14 holding ink. Capless liquid writing instrument. 6. The valve mechanism portion 9 is a cylindrical valve seat body 10.
And the valve seat portion 1 fitted to the inner surface portion of the front end opening of the valve seat body 10.
2 and a valve rod 11 which is slidably inserted into the valve seat body 10 and closes the rear end opening of the valve seat portion 12 by the biasing force of the spring 15, and is normally in the approximate center of the valve rod. The tapered valve portion 11a provided on the outer periphery is in close contact with the rear end of the valve seat portion 12, and the ink chamber 8 is formed in the inner hole of the valve seat body 10 behind the close contact portion.
The ink in a can flow in, and the rod shaft portion 11b formed in front of the tapered valve portion 11a of the valve rod 11 is tightly inserted in the inner hole of the valve seat portion 12 and in front of the rod shaft portion 11b. Groove 1
1c is formed to provide an ink holding chamber 13, and a rod shaft portion 11d having the same diameter as that of the rod shaft portion 11b is formed in front of the ink holding chamber 13, and the ink holding chamber 13 extends from the front end of the valve seat portion 12 to the pen. The capless liquid writing instrument according to claim 5, wherein a gap through which ink can pass is formed to a front end with which a rear end of the core 20 abuts.