JPH0242469Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is based on a small tube whose nib is a small tube and a rod that is loosely inserted into the small tube and can slide by its own elasticity. Pertains to type writing instruments.

(Prior Art) As shown in FIG. 3, the applicant previously proposed a small tube 1 made of metal or ceramic that is supported protrudingly by a tip holder 3, and a small tube 1 that is loosely inserted into the small tube 1 with its tip slightly protruding. A rod 2 having elasticity constitutes a pen tip, and a bent portion 2 is provided at the rear of the rod 2.
a, 2a, and the rear end is inserted into the relay core insertion hole 3.
A small tube type writing instrument is proposed, which is placed on the tip of an ink relay core 4 located at a.

This product has superior advantages in terms of production technology compared to the previously proposed type that applied sliding force to the rod by using an elastic material such as urethane. However, as shown in Fig. 4, there is a possibility that the rear end of the rod 2 may be misaligned due to impact such as a fall, and as a result, the specified sliding force cannot be applied to the rod 2. Alternatively, the length of the tip of the rod 2 protruding from the small tube 1 may become too long, leading to the problem that it may break during writing.

(Purpose of the invention) The present invention clamps and fixes the rear end of an elastic rod that is loosely inserted into a small tube between the inner end surface of the tip holder's relay core insertion hole and the annular protrusion at the tip of the ink relay core. Thus, the object of the present invention is to provide an excellent small tube type writing instrument that eliminates the above-mentioned problems.

(Structure of the invention) The present invention uses a small tube and an elastic rod loosely inserted into the small tube as a pen tip, and an ink relay core is arranged in a relay core insertion hole at the rear of the tip holder that projects and supports the small tube. A small tube type writing instrument comprising: an annular protrusion at the tip of the ink relay core, and the rear end of the rod is clamped and fixed between the protrusion and the inner end surface of the relay core insertion hole. The main focus is on small tube type writing instruments.

(Example) FIG. 1 shows an example of the present invention, and the same reference numerals as those described above are used. That is, 1
2 is a small tube, 2 is an elastic rod, 3 is a tip holder, and 4 is an ink relay core. Note that the ink relay wick 4 is connected at its rear part to an ink storage section (not shown). The rod 2 has a bent portion 2a bent at approximately 90 degrees at its rear end, and the rear end is connected to the inner end surface 3b of the relay core insertion hole 3a at the rear of the tip holder 3 and the tip of the ink relay core 4. It is clamped and fixed by an annular protrusion 4a.

The annular protrusion at the tip of the ink relay core in the present invention is shown as being integral with the ink relay core in the above embodiment, but as shown in FIG. ' may be formed, and various other modifications are possible within the scope of achieving the object of the present invention.

(Function) When writing, the rod 2 is inserted into the small tube 1, its bent portion 2a falls into the concave portion 4b at the tip of the ink relay wick 4, and the rod 2 is then slid to store ink. The ink guided to the ink relay wick 4 from a section (not shown) is discharged from the tip of the small tube 1, allowing writing.

(Effects of the invention) As described above, the present invention uses a small tube and an elastic rod that is loosely inserted into the small tube as a pen tip, and the ink is inserted into the intermediate core insertion hole at the rear of the tip holder that protrudes and supports the small tube. A small tube type writing instrument having a relay core arranged therein, wherein a ring-shaped protrusion is provided at the tip of the ink relay core, and the protrusion and the inner end surface of the relay core insertion hole connect to the rear end of the rod. By clamping and fixing the rod, it is possible to prevent the rear part of the rod from shifting as much as possible due to shocks such as drops, thereby ensuring stable application of sliding force to the rod, and preventing writing from becoming impossible if the tip of the rod breaks. This does not cause the problems mentioned above, and it is possible to provide an excellent small tube type writing instrument.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the main part showing another embodiment of the invention, and Fig. 3 is a longitudinal sectional view of the main part showing a conventional example. , 4th
The figure is a longitudinal cross-sectional view of a main part showing an example of the state when the problem in FIG. 3 occurs. 1... Small tube, 2... Rod, 3... Chip holder, 3a... Relay core insertion hole, 3b... Inner end surface part,
4... Ink relay core, 4a, 4a'... Annular protrusion.

Claims (1)

[Scope of utility model registration request] A small tube type writing instrument in which a small tube and an elastic rod loosely inserted into the small tube are used as a pen tip, and an ink relay core is arranged in a relay core insertion hole at the rear of the tip holder that projects and supports the small tube. A small tube type writing instrument, wherein a ring-shaped protrusion is provided at the tip of the ink relay core, and the rear end of the rod is clamped and fixed between the protrusion and the inner end surface of the relay core insertion hole.