JP2589399Y2 - Replaceable ink tank 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 ink tank replaceable writing instrument. More specifically, the present invention relates to an ink tank replaceable writing implement in which a pen tip and an ink storage member are provided at an end opening of a barrel, and a relay member connected to an ink tank is provided behind the ink storage member.

[0002]

2. Description of the Related Art Conventionally, in this type of writing instrument, a structure in which a thread is provided on an inner wall of a shaft cylinder and an outer wall of a relay member and the relay member is screwed to the inner wall of the shaft cylinder is disclosed in Japanese Patent Publication No. 23319/1995. Have been.

[0003]

However, in the conventional structure, the relay member cannot be quickly mounted at a predetermined position on the inner wall of the shaft cylinder because of the mounting structure by screwing. Was easy to occur.
Also, when replacing the ink tank, depending on the ink tank,
There is a possibility that the screwing of the relay member is loosened and the relay member comes off from the inner wall of the shaft cylinder.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to easily and surely attach a relay member to a predetermined position. Further, when the ink tank is replaced, the relay member may be loosened. An object of the present invention is to provide an ink tank replacement type writing instrument which does not come off.

[0005]

According to the present invention, a pen tip 7 and an ink storage member 6 are provided at the tip end opening of the barrel 1 and further connected to the ink tank 5 behind the ink storage member 6. An ink tank replaceable writing instrument provided with a relay member 3, wherein a concave portion 4 is provided on an outer wall of the relay member 3, a convex portion 2 is provided on an inner wall of the barrel 1, and the concave portion 4 is engaged with the convex portion 2. , The relay member 3 must be attached to the inner wall of the barrel 1.

As the projection 2, for example, an annular projection or a plurality of projections or ribs arranged in a line at an appropriate distance from each other are effective. Further, the shape and the size may be any as long as they can be securely engaged with the concave portion 4 and cannot be easily removed after the engagement. For example, the cross-sectional shape of the protrusion 2 is
Examples include a square shape, a hemispherical shape, and a shape in which the corners of the square shape are chamfered in a tapered or curved shape. In addition to the configuration in which the projection 2 is formed integrally with the barrel 1, the projection 2 may be formed of a separate member and fixed to the barrel 1.

On the other hand, the concave portion 4 has, for example, an annular groove,
Alternatively, a plurality of holes or the like arranged circumferentially in parallel on the outer wall of the relay member 3 may be used. In addition, as long as the concave portion prevents movement of the convex portion in the front-rear direction, in addition to the configuration in which a portion for locking the convex portion 2 in the front-rear direction is formed by a surface, a plurality of axial ribs and It can also be constituted by a plurality of projections.

The pen tip 7 is, for example, a fountain pen type,
A ballpoint pen, a small tube, a plastic pen body having an ink passage in the axial direction, a fiber pen body, a plastic porous pen body, and the like are appropriate.

[0009]

The relay member has a concave portion on the outer wall and a convex portion on the inner wall of the barrel.
The relay member 3 can be reliably and easily attached to a predetermined position on the inner wall of the shaft cylinder 1 by the structure that engages with the vehicle. In addition, the engagement between the concave portion 4 and the convex portion 2 makes the shaft cylinder 1
The relay member 3 attached to the inner wall does not come loose or come off when the ink tank 5 is replaced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.
(See FIGS. 1-3)

An ink storage member 6 is provided at the opening of the end of the barrel 1.
Is inserted, and the tip of the ink storage member 6 is attached to a pen tip 7.
(Here a fountain pen) is attached. The ink storage member 6 may have any structure as long as it temporarily stores overflowing ink due to an increase in the internal pressure of the ink tank 5, and here, a number of comb grooves are formed on the peripheral surface, and the center hole is formed in the center hole. A conventionally known structure having an ink guide core 61 for guiding ink to the pen tip 7 is adopted.

On the inner wall of the barrel 1 behind the ink storage member 6, a convex portion 2 is provided in an annular shape.
Are mounted by overcoming engagement. In addition, an ink tank 5 is opened and mounted at the rear of the relay member 3.

The relay member 3 is a cylindrical body made of synthetic resin having an inner hole 31 penetrating in the axial direction, and has an annular recess 4 on its outer peripheral surface which engages with the convex portion 2 of the inner wall of the shaft cylinder 1. Are formed. The shape of the concave portion 4 and the convex portion 2 is a cross-sectional shape in which surfaces perpendicular to the axial direction abut against each other so that the relay member 3 does not easily move in the front-rear direction after being mounted, and furthermore, has a radially inward shape. It is set relatively large.

At the rear end of the relay member 3, a protruding piece 3 for pushing back a plug body 51 fitted in the opening of the ink tank 5 to the rear.
2 and a coupling portion 33 that is fitted into the opening of the ink tank 5 after opening. Further, two annular projections 34 are provided in front of the coupling portion 33 and behind the concave portion 4 so as to be fitted to the inner wall of the barrel 1 in a liquid-tight manner.

Further, the relay member 3 has a tapered tapered surface 36 at a tip thereof so as to make it easier to get over the convex portion 2 and further has an elasticity inward in the radial direction when it gets over the convex portion 2. To facilitate deformation, two notches 35 are provided on the side wall from the tip to the recess 4. Of course, the shape, size, and number of the cutouts 35 may be any, as long as the side wall in front of the concave portion 4 of the relay member 3 is an elastic leg piece.

Further, a reduced diameter portion 62 is formed at the rear end of the ink storage member 6, and the reduced diameter portion 62 is formed in the inner hole 3 of the relay member 3.
1 is inserted. For this reason, the deformation of the relay member 3 inward in the radial direction after the attachment is restricted, and the relay member 3 is further improved.
Is prevented from falling off from the inner wall of the shaft cylinder 1.

In this embodiment, the relay member 3 is connected to the shaft cylinder 1.
After the ink storage member 6 is attached to the inner wall, the ink storage member 6 is inserted from the front end of the shaft cylinder 1. Therefore, the front end of the relay member 3 is brought into contact with the rear end surface of the ink storage member 6, and It also functions as a positioning stopper.

FIGS. 4 and 5 show a second embodiment.

As in the first embodiment, an annular convex portion 2 is formed on the inner wall of the barrel 1. The convex portion 2 has a rectangular cross section, and in particular, its rear corner is rounded so as to reduce resistance when the relay member 3 gets over the convex portion 2.

On the other hand, a concave portion 4 corresponding to the convex portion 2 is formed in the relay member 3. Four ribs 37 each having a tapered tip are provided on the front side wall of the recess 4, and the rear end of the rib 37 constitutes a front engagement portion of the recess 4. Further, the rib 37 is divided by four notches 35, and the notches 35 allow easy elastic deformation inward in the radial direction. The other configuration is the same as that of the first embodiment.

[0021]

[Effect of the Invention] The present invention has the above-described structure,
The relay member can be securely and easily attached to a predetermined position on the inner wall of the barrel. In addition, the relay member attached to the inner wall of the barrel does not loosen or come off when the ink tank is replaced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is an enlarged explanatory view when the relay member of FIG. 1 is attached.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged explanatory view of the second embodiment of the present invention when the relay member is attached.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Convex part 3 Relay member 31 Inner hole 32 Protrusion piece 33 Joining part 34 Annular protrusion 35 Notch 36 Tapered surface 37 Rib 4 Depression 5 Ink tank 51 Plug body 6 Ink storage member 61 Ink guide Core 7 Nib

Claims (1)

(57) [Scope of request for utility model registration] 1. A pen point (7) and an ink storage member (6) are provided at a tip end opening of a barrel (1), and an ink tank (5) is provided behind the ink storage member (6). In the ink tank exchange type writing instrument provided with the relay member (3) to be connected, a concave portion (4) is provided on an outer wall of the relay member (3) and a convex portion (2) is provided on an inner wall of the shaft cylinder (1). An ink tank replaceable writing implement, wherein 4) is engaged over the convex portion (2) and the relay member (3) is attached to the inner wall of the shaft cylinder (1).