JP2549410Y2 - Capless writing instrument - Google Patents

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

[0002]

2. Description of the Related Art Conventionally, a writing instrument equipped with volatile ink such as a marker, a felt-tip pen, and a correction tool is provided with a cap for sealing 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 which is sealed with an opening / closing lid as in the present application, but the structure is complicated, and there is a problem that the protruding portion is stained or damaged at the time of opening / closing the lid with the pen tip.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive capless writing instrument which solves the above-mentioned problems.

[0004]

The capless writing implement of the present invention devised to achieve the above object has a lid that constantly covers the opening by imparting spring properties to the side surface of the front end of the barrel. An inner cylinder and a receiving member, which can be freely opened and closed, and whose tip is opened in the inner hole of the barrel, are arranged so as to be able to move back and forth via a return spring, and a writing body with a pen tip at the tip of the tip The writing body is fitted in the cylinder so as to be positioned at the advance / retreat position, and the writing main body is interlocked with the receiving member in the forward direction, and the inner cylinder is interlocked with the writing main body in the retreating direction by the engaging portion provided at the shaft tip. At the retreat position of the writing main body, the tip of the inner cylinder is sealed with the inner surface of the lid, and the seal portion provided on the side of the shaft tip slidably contacts the inner diameter of the inner cylinder, and the pen tip is Are closely fitted in the inner cylinder. As described above, when the writing main body is moved to the forward position, the writing main body is advanced integrally with the inner cylinder and the receiving member, the lid portion is opened at the cylinder tip of the inner cylinder, and the inner cylinder is prevented from moving forward. Thus, the writing body compresses the return spring and further advances, so that the pen tip appropriately protrudes from the cylinder tip.

[0005]

1 and 2 show an embodiment of the present invention. First, as shown in FIGS. 1 and 2, the writing main body 16 is a correction liquid type correction tool that can correct a typographical error such as a marker, a felt-tip pen, a ball-point pen, and has a step 21 at the front end of a cylinder loaded with ink. , Having a tip portion 17 on the front side,
A pen point 20 is provided at the tip of the pen 7. Shaft tip 1
A projection-like engaging portion 19 is formed at the front end of 7, and an O-ring 18 is fitted on a substantially central side surface.

The shaft cylinder 1 has a lid 4 that constantly covers an opening portion rotatably fixed to the side surface of the front end of the shaft cylinder 1 by a shaft support 5. A hinge spring 7 is mounted. Further, the inner hole of the shaft cylinder 1 has an inner step 3
However, a locking portion 2 is protruded rearward. A locking portion for positioning the writing main body 16 at the advance / retreat position is appropriately provided on the rear end side of the barrel 1. As an example, in the case of the knocking type, a means for locking the advancing / retracting position between the barrel 1 and the writing main body 16 and a return spring different from a return spring 15 for retracting the writing main body 16 to be described later are provided. Will be arranged. (It is not shown in the drawings, and the description is omitted because it is not the gist of the present invention.)

On the other hand, an inner tube 8 and a receiving member 13 are disposed in the inner hole of the shaft tube 1 so as to be movable back and forth. The inner cylinder 8 has a cylinder tip 12 having an inclined cut end at the front end, and a flange 10 at the rear end. Further, a protruding engagement portion 11 is formed in the inner diameter portion 9. The receiving member 13 is the writing main body 1.
6 has an inner step portion 14 in contact with the step portion 21, the rear end of which is in contact with the locking portion 2 of the barrel 1 and is prevented from retreating. A return spring 15 is urged between the rear end of the collar 10 of the inner cylinder 8 and the front end of the receiving member 13. The inner tube 8 and the receiving member 13 are fitted from the rear end of the shaft tube 1 with the return spring 15 urged, and the collar 10 and the outer peripheral portion of the receiving member are disposed by elastically deforming the locking portion 2. You.

As described above, the writing main body 16 is fitted from the rear end of the barrel 1, the step 21 abuts on the inner step 14 of the receiving member 13, and the engaging portion 19 of the shaft tip 17 becomes the inner cylinder 8. Engaging portion 11
When the writing body 16 is retracted, the inner cylinder 8 is locked in an interlocking relationship. Incidentally, the engagement between the shaft tip portion 17 and the inner cylinder 8 is suitably removable. The O-ring 18 fitted on the side surface of the shaft tip 17 is closely fitted to the inner diameter portion 9 of the inner cylinder 8, but is slidable therebetween. In addition, as shown in FIG. 1, at the retreat position of the writing main body 16, the inner surface of the lid 4 is in close contact with the cylinder tip 12 of the inner cylinder 8, and the pen tip 20 moves between the O-ring 18 and the inner cylinder 8. It is closely fitted to the inner diameter portion 9. In addition, a sealing material such as rubber is appropriately provided on the inner side surface 6 of the lid portion 4 to ensure the close contact with the cylinder tip portion 12 and the like. (Not shown)

[0009]

The capless writing instrument of the present invention is constructed as described above. When not in use, the pen tip 2 is used as shown in FIG.
Numeral 0 is tightly fitted to the inner diameter portion 9 of the inner cylinder 8 by the lid portion 4 and the O-ring 18 to prevent evaporation of the ink and drying of the pen tip. Next, when the writing main body 16 is moved to the forward position by means of knocking or the like, the writing main body 16 advances integrally with the inner cylinder 8 and the receiving member 13, and the cylinder tip 12 moves the inner surface 6 of the lid 4. The lid 4 is pushed up to open the cylinder tip 12. That is,
The urging force of the return spring 15 is set appropriately higher than the sum of the force for expanding the cover 4 and the frictional force between the O-ring 18 and the inner cylinder 8. When the lid 4 is expanded, the flange 10 of the inner cylinder 8 contacts the inner step 3 of the shaft cylinder 1 to prevent the inner cylinder 8 from moving forward. Is compressed, the pen tip 20 appropriately protrudes from the tip of the barrel tip 12, and the writing body 16 is positioned at the forward position with respect to the barrel 1. Further, when the forward positioning of the writing body 16 is released and the writing body 16 is retracted,
The engaging portion 19 of the shaft tip portion 17 contacts the engaging portion 11 of the inner cylinder 8 to retreat the inner cylinder 8, and the state of FIG. 1 is configured again.

[0010]

[Effects of the Invention] The configuration and operation of the capless writing instrument of the present invention are as described above, and there is no hassle of attaching and detaching the cap every time writing is performed, as with a pen tip covered with a conventional detachable cap. It can be used without any problem such as losing the cap and erroneously soiling the hand when attaching or detaching the cap. Also, since the structure is simple, it can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention, showing a state in which a pen tip is closely fitted with a lid.

FIG. 2 is a longitudinal sectional view of a main part showing the embodiment of the present invention, showing a state in which a lid is expanded and a pen tip is projected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Locking part 3 Inner step part 4 Cover part 5 Shaft supporting part 6 Inner side surface 7 Hinge spring 8 Inner cylinder 9 Inner diameter part 10 Flange part 11 Engagement part 12 Cylinder tip part 13 Receiving member 14 Inner part 15 Return spring 16 Writing body 17 Shaft tip 18 O-ring 19 Engagement section 20 Pen tip 21 Step section

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner cylinder having a front end opened in an inner hole of a shaft cylinder, and a lid part that constantly covers an opening is attached to a side surface of a front end of the shaft cylinder so as to be openable and slidable. The inner cylinder 8 and the receiving member 13 are disposed so as to be movable back and forth.
, The return spring 15 is urged, and the receiving member 13 is prevented from retreating to the barrel 1. A pen tip 20 is provided at the tip of a shaft tip portion 17 in the barrel 1 and a writing body 16 loaded with volatile ink is fitted so as to be positioned at an advanced / retracted position. The inner cylinder 8 is interlocked with the writing main body 16 in the retreating direction by an engaging portion provided between the inner cylinder 8 and the shaft tip 17.
At the retracted position of the writing body 16, the tube tip 12 of the inner tube 8 is
The pen tip 20 is tightly fitted in the inner cylinder 8 by being slidably contacted with a seal portion provided on the side surface of the shaft tip 17 in a state slidable. . As described above, when the writing main body 16 moves to the forward position, the writing main body 16 moves forward integrally with the inner cylinder 8 and the receiving member 13, and the inner cylinder 8 moves.
The lid body 4 is opened by the cylinder tip 12 and the writing main body 16 is connected to the return spring 1 while the inner cylinder 8 is prevented from moving forward.
5. The capless writing implement wherein the pen tip 20 is further advanced by compressing the pen tip so that the pen tip 20 appropriately protrudes from the cylinder tip part 12.