JPH0664953U - Ink tank exchangeable writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] The relay member 3 coupled to the ink tank 5 can be securely and easily attached to a predetermined position on the inner wall of the barrel 1. [Structure] A convex portion 2 is provided on the inner wall of a shaft cylinder 1, while a relay member 3 is provided.
The recess 4 is provided on the outer wall of the. The relay member 3 is attached to the inner wall of the barrel 1 by overcoming and engaging the concave portion 4 with the convex portion 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink tank exchangeable writing instrument. More specifically, the present invention relates to an ink tank exchangeable writing instrument in which a pen tip and an ink retaining member are provided at a tip opening portion of a shaft cylinder, and a relay member which is coupled to an ink tank is disposed behind the ink retaining member. .

[0002]

[Prior art]

 Conventionally, in this type of writing instrument, a structure in which a screw thread is provided on the inner wall of the barrel and the outer wall of the relay member and the relay member is screwed to the inner wall of the barrel is disclosed in Japanese Patent Publication No. 1-23319.

[0003]

[Problems to be solved by the device]

 However, in the above conventional structure, the relay member cannot be quickly mounted at a predetermined position on the inner wall of the barrel due to the mounting structure by screwing, and the mounting position in the front-rear direction is likely to vary. Further, when the ink tank is replaced, the relay member may be loosely screwed by the ink tank, and the relay member may come off from the inner wall of the shaft cylinder.

The present invention is to solve the above-mentioned conventional problems, and it is possible to easily and surely attach the relay member at a predetermined position. Further, when the ink tank is replaced, the relay member may become loose. The purpose of the present invention is to provide an ink tank exchangeable writing instrument that does not come off.

[0005]

[Means for Solving the Problems]

 According to the present invention, an ink is provided in which a pen tip 7 and an ink storage member 6 are provided in a tip opening portion of a shaft cylinder 1, and a relay member 3 which is connected to an ink tank 5 is disposed behind the ink storage member 6. A tank exchange type writing instrument, wherein a concave portion 4 is provided on the outer wall of the relay member 3, a convex portion 2 is provided on the inner wall of the shaft cylinder 1, and the concave portion 4 is passed over the convex portion 2 to engage with the concave member 4. It is required to be attached to the inner wall of the barrel 1.

The protrusion 2 is effectively, for example, an annular protrusion, or a plurality of protrusions or ribs arranged side by side in a circumferential shape at appropriate intervals. Further, the shape and the size may be such that they surely engage with the concave portion 4 and do not easily come off after the engagement. For example, the cross-sectional shape of the convex portion 2 may be a rectangular shape, a hemispherical shape, or a shape in which the corners of the rectangular shape are not tapered or are chamfered into a curved surface. The convex portion 2 may be formed integrally with the barrel 1 or may be a separate member and fixed to the barrel 1.

On the other hand, the concave portion 4 may be, for example, an annular groove, or a plurality of holes arranged in a peripheral shape on the outer wall of the relay member 3. Further, if the concave portion prevents the convex portion from moving in the front-rear direction, in addition to the structure in which the portion that locks the convex portion 2 in the front-rear direction is formed by a surface, a plurality of axial ribs or It can also be constituted by a plurality of protrusions.

The pen nib 7 may be, for example, a fountain pen type, a ballpoint pen, a small tube, a plastic pen body having an ink conducting path in the axial direction, a fiber pen body, a plastic porous pen body, or the like.

[0009]

[Action]

 With the structure in which the concave portion 4 of the outer wall of the relay member 3 and the convex portion 2 of the inner wall of the barrel 1 are passed over and engaged with each other, the relay member 3 can be reliably and easily attached to a predetermined position on the inner wall of the barrel 1. Moreover, due to the engagement between the concave portion 4 and the convex portion 2, the relay member 3 attached to the inner wall of the barrel 1 does not loosen or come off when the ink tank 5 is replaced.

[0010]

【Example】

 A first embodiment of the present invention will be described with reference to the drawings. (See Figures 1 to 3)

An ink retaining member 6 is inserted into the tip opening of the barrel 1 and a pen tip 7 (here, a fountain pen nib) is attached to the tip of the ink retaining member 6. The ink retaining member 6 may be of any structure as long as it temporarily retains the overflowing ink due to the increase in the internal pressure of the ink tank 5. Here, a large number of comb grooves are formed on the peripheral surface and the central hole is formed. A conventionally known structure in which an ink guide core 61 for guiding ink to the pen tip 7 is inserted in the pen tip 7 is adopted.

A convex portion 2 is provided in an annular shape on the inner wall of the barrel 1 behind the ink reservoir member 6, and a relay member 3 is mounted on the convex portion 2 by overcoming engagement. Further, an ink tank 5 is opened and attached to the rear portion 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 an annular concave portion 4 engaging with a convex portion 2 of the inner wall of the shaft cylinder 1 on the outer peripheral surface thereof. Is formed. The shapes of the concave portion 4 and the convex portion 2 are cross-sectional rectangular shapes in which surfaces perpendicular to each other come into contact with each other so that the relay member 3 does not easily move in the front-rear direction after mounting, and further, inward in the radial direction. It is set relatively large.

At the rear end of the relay member 3, a projection 32 for pushing back the stopper 51 fitted in the opening of the ink tank 5 and a coupling that is fitted into the opening of the ink tank 5 after opening the stopper. The part 33 is formed. Further, two annular protrusions 34 that are fitted in a liquid-tight manner with the inner wall of the barrel 1 are provided in front of the connecting portion 33 and behind the recess 4.

Further, the relay member 3 has a tapered taper surface 36 at the tip in order to easily get over the convex portion 2, and when the relay member 3 gets over the convex portion 2, it is elastic inward in the radial direction. Two notches 35 are provided on the side wall extending from the tip to the recess 4 for easy deformation. Needless to say, the notch 35 may have any shape, size, or number as long as the side wall in front of the recess 4 of the relay member 3 serves as 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 inserted into the inner hole 31 of the relay member 3. Therefore, the deformation of the relay member 3 after mounting is limited inward in the radial direction, and the relay member 3 is further prevented from falling off the inner wall of the barrel 1.

Further, in this embodiment, since the relay member 3 is attached to the inner wall of the barrel 1 and the ink storage member 6 is inserted from the tip of the barrel 1, the tip of the relay member 3 is It also comes into contact with the rear end surface of the ink retaining member 6 and also functions as a positioning stopper in the axial direction.

A second embodiment is shown in FIGS. 4 and 5.

On the inner wall of the barrel 1 is formed a ring-shaped convex portion 2 as in the first embodiment. The convex portion 2 has a rectangular cross section, and in particular, rear corners thereof are rounded in a curved shape so as to reduce the resistance when the relay member 3 gets over the convex portion 2.

On the other hand, the relay member 3 is provided with a concave portion 4 corresponding to the convex portion 2. The front side wall of the concave portion 4 is provided with four ribs 37 whose tip is tapered, and the rear end of the rib 37 constitutes a front side engaging portion of the concave portion 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 structure is the same as that of the first embodiment.

[0021]

[Effect of device]

 According to the present invention, the relay member can be reliably and easily attached to a predetermined position on the inner wall of the barrel by adopting the above-mentioned configuration. Moreover, the relay member attached to the inner wall of the barrel does not come loose or come off when the ink tank is replaced.

[Brief description of 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 diagram when the relay member of FIG. 1 is attached.

3 is a cross-sectional view taken along the line AA of FIG.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Convex part 3 Relay member 31 Inner hole 32 Projecting piece 33 Coupling part 34 Annular protrusion 35 Notch 36 Tapered surface 37 Rib 4 Recess 5 Ink tank 51 Stopper 6 Ink storage member 61 Ink induction core 7 Pen tip

Claims (1)

[Scope of utility model registration request] 1. A pen tip (7) and an ink retaining member (6) are provided at an opening of a tip end of a barrel (1), and an ink tank (5) is provided behind the ink retaining member (6). In an ink tank exchange-type writing instrument in which a relay member (3) to be coupled is arranged, a recess (4) is provided on the outer wall of the relay member (3) and a protrusion (2) is provided on the inner wall of the barrel (1), and the recess ( An ink tank exchange-type writing instrument in which 4) rides over and engages with the convex portion 2 and the relay member 3 is attached to the inner wall of the barrel 1.