JPS604786Y2 - brush pen - Google Patents

Description

[Detailed description of the invention] The present invention relates to a brush pen that has a two-layer structure of a brush tip made of an integrally molded brush tip made of porous synthetic resin and a relay core for guiding ink. When assembling,
The object of the present invention is to devise a method in which the above-mentioned integrally molded brush tip made of porous synthetic resin and the relay core can be set in the correct positional relationship with respect to each other.

In general, an integrally molded brush tip made of porous synthetic resin has low tear strength, and on the other hand, the relay core whose tip is inserted into the hollow part of the brush tip is relatively rigid, so it is easy to insert both without thinking. As a result, the brush tip is torn from the inner tip, and the tear may eventually extend to the outer surface of the brush tip.

In this case, when the ink in the ink storage body or ink cartridge inside the barrel is drawn out by the relay core, it flows more easily from the tear point than from the surface of the brush tip, making it impossible to write satisfactorily. become.

Japanese Utility Model Application Publication No. 53-158325 discloses a brush pen with a tip in which the tip of a relay lead is inserted into the hollow part of the brush tip made of porous synthetic resin. Since it is attached by being press-fitted into the tip of the cylinder, there is a risk that the same kind of tearing as mentioned above may be caused to the tip of the brush when it is press-fitted.

The present invention was devised in order to eliminate the above-mentioned drawbacks, and will be described below with reference to embodiments shown in the drawings.

In FIG. 1 showing the first embodiment, the annular protrusion 2 is formed inside the tip of the shaft cylinder 1, so that the annular front end surface 3 of the annular projection 2 is formed inside the shaft cylinder 1, The rear end surface 5 of the integrally molded brush tip 4 made of porous synthetic resin and the step end surface 7 formed on the relay core 6 come into contact with the annular front end surface 3, thereby restricting their mutual positions.

In this state, the tip end of the relay lead 6 fits into the hollow part of the brush tip 4 without too much or too little.

Next, an annular protrusion 2 is also formed inside the barrel 1 in FIG. 2 showing the second embodiment, and what comes into contact with the front end surface 3 is an integrally molded brush tip 4 made of porous synthetic resin. This embodiment differs from the first embodiment in that only the rear end surface 5 and the step end surface 7 of the relay core 6 abut against the rear end surface 3C of the annular protrusion 2.

However, in this state, the tip end of the relay lead 6 fits into the hollow portion of the brush tip 4 in just the right amount.

Such an annular protrusion 2 for regulating the position does not necessarily have to be formed on the inside of the shaft cylinder 1, but may be formed on the outside of the shaft cylinder 1.

In FIG. 3 showing the third embodiment, there is an annular protrusion 2 on the outside of the shaft cylinder 1, which has a first annular front end surface 3a and a second annular front end surface 3b. The step end surface 7 of the relay core 6 and the rear end surface 5 of the integrally molded brush tip 4 made of porous synthetic resin abut on the annular front end surface 3b, respectively.

Although not shown in the drawings, the first annular front end surface 3a and the second annular front end surface 3b are made the same surface, and the rear end surface 5 of the brush tip 4 and the relay core 6 are similar to the annular front end surface 3 in FIG. Step end face 7
They may be brought into contact with each other.

However, in order to hold the rear end portion of the brush tip 4 between the tip 8 and the protruding portion of the annular protrusion 2'' using the tip 8 screwed onto the barrel 1, the first and second annular It is advantageous that the front end surfaces 3a, 3b are formed.

In FIG. 4 showing the fourth embodiment, the stepped end surface 7 of the relay core 6 is in contact with the rear end surface 3"C of the annular projection 2, as in FIG. 2, and the second annular front end surface 3b of the annular projection 2 is positioned in contact with the rear end surface 5 of the brush tip 4, as in FIG.

In the figure, reference numeral 10 denotes a hole for air circulation, which is bored in the shaft tube 1, but it may also be a groove provided in the inner surface of the annular protrusion 2.

As described above, the present invention provides a brush pen having a structure in which the tip of the relay lead 6 is inserted into the hollow part of the integrally molded porous brush tip 4.
? 3a, 3b and an annular protrusion 2 having an annular rear end surface 3c
The rear end surface 5 of the brush tip 4 forms the annular front end surface 3,
3b, and the step end surface 7 formed on the relay core 6 abuts on the annular front end surface 3.3a or the annular rear end surface 3.3c,
Since they are mutually positioned, the brush tip 4 cannot be inserted into the relay lead 6 without permission, and therefore, insertion that would tear the inner tip of the brush tip 4 at the tip of the relay lead 6 is not allowed.

Further, when the structure is such that the rear end portion of the brush tip 4 is held between the tip 8 removably attached to the shaft tube 1 and the overhanging portion of the annular projection 2, only the brush tip 4 can be easily replaced.

[Brief explanation of drawings]

1 to 4 are partially sectional views showing essential parts of different embodiments of the present invention. 1... shaft cylinder, 2... annular protrusion, 3.
3at 3b...Annular front end surface, 3c...
- Annular rear end surface, 4... integrally molded brush tip made of porous synthetic resin, 5...... rear end surface of brush tip 4, 6...
...Relay core, 7...---Step end face of relay core 6.

Claims (1)

[Claims for Utility Model Registration] A brush pen having a structure in which: 1 an integrally molded porous brush tip 4 a tip of a relay lead 6 is inserted into a hollow part;
An annular projection 2 having an annular front end surface 3, 3at ab and an annular rear end surface 3c is formed on the inside or outside of the brush tip, and the rear end surface 5 of the brush tip 4 is in contact with the annular front end surface 3, 3b, The stepped end surface 7 formed in the brush pen 6 is in contact with the annular front end surface 3, 3a or the annular rear end surface 3c, thereby positioning the brush pen relative to each other. 2. The brush pen according to claim 1, which is a registered utility model, and has a structure in which the rear part of the brush tip 4 is held between a tip 8 which is detachably attached to the shaft tube 1 and a projecting part of the annular projection 2.