JPH10114188A - Writing instrument without cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealability and operability in a writing instrument without cap such as a felt-tip pen or a marker. SOLUTION: In the writing instrument without cap in which a sealing cylinder 2 having a sealing cover 3d is disposed in an end inner hole of a barrel 1 having an end port, a refill 7 is disposed lockably to a longitudinal position to the barrel from a rear inner hole of the barrel, at the time of retracting the refill, the cover 3d is pressed to seal an opening 3c, a nib 10a of the refill is brought into close contact with the cylinder 2, and at the tie of forwarding the refill, and the nib can be projected from the end port of the barrel, the cylinder 2 is formed with front and rear end cylinders 3, 5 fixed to the end inner hole of the barrel, and a flexible part 4 such as a cylindrical cornice integrally between the front and rear end cylinders 3 and 5. A sealing cover 3d for sealing the opening is provided by connecting it from one side of an end of the cylinder 3, end outer periphery of the refill is closely engaged with the inner surface of the cylinder 5, and locked therebetween.

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 writing instrument equipped with a volatile ink such as a marker and a felt-tip pen.

[0002]

2. Description of the Related Art Conventionally, a writing instrument such as a marker and a felt-tip pen on which a volatile ink is mounted has a cap attached to seal a pen tip. Therefore, there are problems such as troublesome attachment and detachment of the cap and loss of the cap. Many capless writing instruments are known to solve such a problem, but few have surely overcome the sealing property. Further, there is a type in which the opening / closing lid seals as typified by Japanese Patent Application No. 1-150397, etc., as a reliable sealing device. However, when the tip protrudes from the tip end of the barrel, a sealing chamber is provided. The inner surface and the outer periphery of the shaft portion having a pen point at the tip are tightly fitted and slide between each other, so that the seal is incomplete, too tight, or the ink sticks to each other, causing poor sliding. There's a problem.

[0003]

SUMMARY OF THE INVENTION The present invention makes it possible to provide a capless writing instrument which solves the above problems.

[0004]

In order to achieve the above object, a capless writing instrument according to the present invention is provided with a seal lid capable of sealing and releasing the distal end opening in a forward inner hole of a barrel having a distal end opening. A seal cylinder is provided, and a refill such as a felt-tip pen, a marker, etc. is disposed so as to be able to be locked in a forward and backward retreat position with respect to the shaft cylinder from a rear inner hole of the shaft cylinder, and a seal lid is provided by a coupling mechanism which cooperates with the refill when the refill is retracted. Presses and seals the opening, and the pen tip of the refill is tightly packed in the seal cylinder.When the refill advances, the pressing state of the seal lid by the connecting mechanism is released, and the pen tip can protrude from the tip end of the shaft cylinder. In the capless writing instrument described above, the seal cylinder 2 is fixed to the forward end bore of the shaft cylinder 1 and the tip cylinder 3
And a rear end tubular portion 5, and an extendable portion 4 such as a tubular bellows is integrally formed between the front end tubular portion 3 and the rear end tubular portion 5, and are joined from one end of the distal end tubular portion 3. A seal lid 3d is provided to seal the opening 3c, and the outer peripheral portion of the front shaft portion 7 of the refill 6 is closely fitted to the inner surface of the rear end tubular portion 5 and the gap therebetween is locked. Non-sliding between the cylinder 2 and the outer peripheral portion of the tip shaft portion 7 of the refill can be made non-sliding, thereby improving sealing performance and solving poor sliding.

[0005] A spring receiver 11 is disposed at the rear end of the rear end cylinder 5, and a spring 13 for urging the spring receiver 11 rearward is provided between the rear end of the front end cylinder 3 and the front end of the spring receiver 11. Further, a connecting member such as a thread-like member 12 is connected between the seal lid 3d and the spring receiver 11, so that the connecting mechanism includes the spring receiver 11, the spring 1
3. It is composed of a connecting member such as a thread-like member 12.

[0006]

1 to 3 show an embodiment of a capless writing instrument according to the present invention. First, the capless writing implement of the present application is a writing implement on which ink such as a marker or a felt-tip pen is mounted, and a seal lid capable of sealing and releasing the opening 3c at the front end of the shaft cylinder 1 having the front end opening 1a. A seal cylinder 2 provided with 3d is disposed, and a refill 6 such as a felt-tip pen, a marker, or the like is disposed so as to be able to be locked in a forward and backward retreat position with respect to the shaft cylinder 1 from a rear inner hole of the shaft cylinder. The seal lid 3d presses and seals the opening 3c by a coupling mechanism interlocked therewith, and the nib 10a of the refill 6
Are tightly packed in the seal cylinder 3, and when the refill 6 advances, the pressing state of the seal lid 3 by the connecting mechanism is released, so that the pen point 10a can protrude from the tip end port 1a of the shaft cylinder. It is.

The seal cylinder 2 has a front end cylinder 3 and a rear end cylinder 5.
And an extensible portion 4 such as a tubular bellows is integrally formed between the front end tubular portion 3 and the rear end tubular portion 5, and is formed of a resin molded product excellent in characteristics of suppressing ink evaporation. Further, the distal end tubular portion 3 has a flange portion 3a on an outer peripheral portion, and a guide groove 3b for guiding a thread-like member 12 described later is provided at a required portion of the flange portion. Further, a seal lid 3d is provided, which is joined from one side of the distal end of the distal end cylindrical portion 3 with a hinge 3e or the like and can seal the opening 3c.

An inner peripheral surface 5a is formed on the inner surface of the rear end cylindrical portion 5 and a locking portion 5b of a circumferential groove is formed behind the inner peripheral surface 5a, and a peripheral protrusion provided on a front shaft portion 7 of a refill described later. 7b is in close contact with the inner peripheral surface 5a, and a locking portion 7a forming a ridge or a circumferential projection is locked to the locking portion 5b.

Also, a spring receiver 1 is provided at the rear end of the rear end cylindrical portion 5.
1 is provided, and the rear end of the distal end tubular portion 3 and the spring receiver 11 are provided.
A spring 13 for urging the spring receiver 11 rearward is provided between the front end of the spring 11 and a connecting member made of a thread-like member 12 such as nylon is connected between the seal lid 3d and the spring receiver 11. The connecting mechanism includes a connecting member of a spring receiver 11, a spring 13, and a thread-like member 12.

The refill 6 is a cylindrical body comprising a large-diameter ink container 8 having a front shaft 7 at the front and a step 6a at the rear, and a pen core 10 is inserted and fixed into an inner hole of the front shaft 7. Pen core 1
The rear end of the ink storage unit 9 is inserted into the ink storage unit 8 at the rear end thereof. Further, the tip of the pen core 10 protrudes from the tip of the tip shaft portion 7 as appropriate to form a pen tip 10a.

[0011] The refill 6 has a tip shaft 7 whose sealing cylinder 2
The stepped portion 6a is brought into contact with the rear end of the spring receiver 11, and the locking portion 7a provided on the rear outer peripheral portion of the front shaft portion 7 is engaged with the locking portion 5b of the rear end cylindrical portion 5. Are fixed elastically to each other, and the circumferential projection 7b is
a, and the sealing property between them is ensured. It is needless to say that the engaging portion and the close contact portion formed between the inner surface of the seal cylinder and the front shaft portion of the refill can be formed by rearranging the shape relationship. It is also possible to interpose an elastic body such as an O-ring in the close portion.

The refill portion constructed as described above is inserted from the rear of the barrel 1 so that the refill 6 can be locked at the forward and backward retreat positions with respect to the barrel. Further, the tip of a flange 3a provided on the tip tube portion 3 of the seal tube is fixedly abutted on the step portion 1c of the inner hole of the shaft tube 1, and the pen tip 10a is connected with the tip port at the forward position of the refill 6. The pen tip 10a protrudes from the shaft barrel 1 at the retracted position of the refill 6, and is accommodated in the barrel 1.

[0013]

The capless writing instrument of the present invention is constructed as described above. When not in use, the opening 3c of the tip tube 3 is closed by a seal lid 3d as shown in FIGS. 1 and 2.
Since the pen tip 10a is sealed inside the seal cylinder 2, evaporation of the ink and drying of the pen tip 10a are prevented. Next, when the refill 6 is advanced, for example, by a knocking operation, the spring 13 is compressed and the extensible portion 4 of the seal cylinder is contracted as shown in FIG. 3 so that the pen tip 10a protrudes from the tip end port 1a of the shaft cylinder 1. . At this time, since the thread-like member 12 is loosened, the seal lid 3d expands without resistance. The feature of the present application is that there is no sliding portion between the tip shaft portion 7 of the refill and the inner hole of the seal cylinder 2, so that poor sliding or incomplete sealing due to dimensional variations between them does not occur.

[0014]

The construction and operation of the capless writing instrument according to the present invention are as described above. In contrast to the conventional capless type writing instrument, the present invention is directed to a shaft having a pen point at the inner surface and the tip of a seal cylinder. Since the structure is such that the outer periphery does not slide, it is possible to avoid problems such as inadequate sealing, tightness, and sticking of ink between each other to cause poor sliding as in the conventional case.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part viewed from the upper surface of a capless writing instrument according to an embodiment of the present invention, and shows a state in which a pen tip is sealed with a sealing lid.

FIG. 2 is a longitudinal sectional view of a main part of the embodiment, as viewed from the front, corresponding to FIG.

3 is a longitudinal sectional view of a main part showing a state in which the refill is advanced from the state of FIG. 2, the seal lid is opened, and the pen tip is projected from the tip end of the barrel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Tip mouth 1b Inner hole 1c Step 2 Seal cylinder 3 Tip cylinder 3a Flange 3b Guide groove 3c Opening 3d Seal lid 3e Hinge 4 Stretchable part 5 Rear end cylinder 5a Inner peripheral surface 5b Lock Part 6 Refill 6a Stepped part 7 Front shaft part 7a Locking part 7b Peripheral projection 8 Ink storage part 9 Ink occluding body 10 Pen core 10a Pen tip 11 Spring receiver 11a Vertical groove 12 Thread member 12a Fastening part 13 Spring

Claims (2)

[Claims] 1. A seal cylinder having a seal lid capable of sealing and opening a distal end opening is disposed in a forward inner hole of a shaft cylinder having a distal end opening, and a refill such as a felt-tip pen, a marker, or the like is provided from a rear inner hole of the shaft cylinder. Is disposed so as to be able to be locked at the front and rear retreat position with respect to the shaft cylinder, and when the refill is retracted, the seal lid presses and seals the opening by a coupling mechanism interlocking with the refill, and the pen tip of the refill is tightly mounted on the seal cylinder, In the capless writing implement in which the pressing state of the seal lid by the connecting mechanism is released when the refill advances, and the pen tip can be protruded from the tip end of the barrel, the seal cylinder 2 is formed of the barrel 1 A front-end tube portion 3 and a rear-end tube portion 5 fixed to the front inner hole;
A seal lid 3d is provided which is joined from one side of the distal end of the distal end cylindrical portion 3 to seal the opening 3c, and the outer peripheral portion of the front shaft portion 7 of the refill 6 is closely fitted to the inner surface of the rear end cylindrical portion 5. Capless writing implements that are locked together. 2. A spring support 11 is provided at the rear end of the rear end tube portion 5, and a spring 13 for urging the spring receiver 11 rearward between the rear end of the front end tube portion 3 and the front end of the spring receiver 11. Is provided, and a connecting member such as a thread-like member 12 is connected between the seal lid 3d and the spring receiver 11, so that the connecting mechanism is constituted by connecting members such as the spring receiver 11, the spring 13, and the thread-like member 12. The capless writing implement according to claim 1, wherein