JPS5917671Y2 - writing implements - Google Patents

Description

[Detailed explanation of the invention] This invention is expected to achieve good ventilation and clear writing even if the cross-sectional areas of the tip and rear of the pen nib are different, and the cross-sectional shapes are similar or completely different. The purpose is to provide durable writing instruments.

To explain the embodiment with reference to the drawings, the pen nib 1 shown in FIGS. 1 to 4 is a polyhedron with a wide cross section as shown in FIG. 1, for example, a nib with a square or rectangular cross section. A rear part 1-2 made of a similar polyhedron is extended to part 1-1, and two parallel sides 1-4° and 1-4 on opposite sides of this rear part and tip part 1-0 are made on the same plane. Along with molding,
The remaining both side surfaces are formed in different steps by forming a stepped portion 13 at the boundary between the front portion 1-1 and the rear portion 1-2.

Thus, the stepped portion 1-3 is formed by shortening the dimension between the remaining two side surfaces of the rear portion 1-2 to make the cross-sectional area narrower than that of the tip portion 1-0.

The cylinder body 2 is a shaft cylinder or the nape of the neck, and the tip part 1 of the pen nib 1
The inner surface 2-1 of the tip part corresponding to -1 is formed into a large diameter circle, and the inner surface 2-2 corresponding to the rear part 1-2 of the nib 1 has a small diameter ridge 23 without a groove. Protrude in a circular shape.

Therefore, the protruding edge 2-3 not only passes through the rear part 1-2 of the pen nib 1, but also engages the stepped part 1-3 provided at the boundary between the tip part 1-1 and the rear part 1-2 of the pen nib 1. This prevents the pen tip 1 attached to the cylindrical body 2 from sinking into the interior.

If the pen tip 1 configured as described above is fitted into the cylinder body 2,
The stepped portion 1-3 is engaged with the protruding edge 2-3, and the corner portion in the elongated direction that forms the boundary between each surface in the rear portion 1-2 is in contact with the hole edge of the protruding edge 2-3. Each surface of 1 and the inner surface 2 of the tip of the cylinder 2
-1 and between each surface of the rear part 12 and the hole edge of the flange 2-3, a space is formed for communication, and this space serves as a ventilation path 3 to ventilate the inside and outside of the cylinder body 2. Null.

The pen nib 1 shown in FIG. 5 has a wide cross-sectional area, and the nib 1 does not sink into the barrel 2 because the stepped portion 1-3 engages with the protrusion 2-3 as described above. A rear part 1-2 made of a similar polyhedron is extended to a tip part 1-1 made of a polyhedron, for example, a square, and the long corners in the axial direction that are the boundaries of each face at the rear part are chamfered to form a projecting edge 2-3. A diagonal or arcuate abutment surface 14 is formed to abut against the rear portion 1-2, thus making the cross-sectional area of the rear portion 1-2 narrower than the cross-sectional area of the tip portion 1-1.

The front portion 1-1 and the rear portion 1-2 have four side surfaces formed on the same plane.

The projecting edge 2-3 of the cylindrical body 2 has a circular shape without a groove, and allows the abutting surface 1-4 at the rear part 1-2 of the nib 1 to abut against the hole edge.

If the pen tip 1 configured as described above is fitted into the cylinder body 2,
A stepped portion 1-3 formed at the boundary between the tip portion 1-1 of the pen nib 1 and the abutment surface 1-4 of the rear portion 1-2 is engaged with the protrusion 2-3, and the abutment surface 1- 4 comes into contact with the hole edge of the projecting edge 2-3, and the pen tip 1 does not sink into the cylinder body 2.

Ventilation inside and outside of the barrel 2 is provided by the space between each surface of the tip 1-1 of the pen nib 1 and the inner surface 2-1 of the tip of the barrel 2, and the rear part 1-2 of the pen nib 1 that communicates with this space. It is carried out through the space between each surface and the hole edge of the ridge 2-3.

That is, the ventilation is performed by the above-mentioned space forming the ventilation path 3.

In the figure, reference numeral 4 denotes a middle tube provided with an ink soaking body 5, into which the end of the rear part 1-2 of the pen nib 1 is inserted.

The air that has flowed into the cylinder body 2 passes through the ventilation path 6 formed between the cylinder body 2 and the medium tube 4 and reaches the end of the medium tube 4, and then flows into the ink soaking body 5 to infiltrate the ink into the pen tip 1. urge

It is also possible to configure each surface of the tip portion 1-1 and rear portion 1-2 of the pen nib 1 to be a concave surface, or to configure each corner of each portion to have an arc shape.

Therefore, the ink-wetting body 5, which has a middle tube 4 formed in advance into a rod shape, may be directly inserted loosely into the cylinder 2. In this case, the air that has flowed into the cylinder 2 will flow between the cylinder and the ink-wetting body. body 5
It reaches the end of the ink soaking body 5 through the ventilation passage 6 formed between the ink pen and the pen tip 1, and flows into the ink soaking body so that the ink soaks into the pen tip 1.

As described above, the present invention has a pen nib formed of a polyhedral tip with a wide cross-sectional area and a polyhedral rear part with a narrow cross-sectional area extending from the tip, and the tip and the rear part are one or more. The cylindrical body, which has one or more side surfaces formed on the same plane, has the inner surface of the tip part corresponding to the tip of the pen tip formed into a large diameter circle, and a cylinder body with one or more side surfaces formed on the same plane. Since the corresponding inner surface is provided with a small-diameter ridge without a concave groove, if the pen tip is attached to the cylinder and passed through the small-diameter ridge, the same plane of the nib will allow the tip of the pen to connect to the cylinder and the cylindrical body. A ventilation path that is always in communication is formed between the rear part of the pen tip and the small diameter flange.

Therefore, even if the cross-sectional areas of the tip and rear of the pen nib are different, and the cross-sectional shapes are similar or completely different, good ventilation can always be obtained, and ink will not infiltrate into the nib. I can write clearly and clearly.

Then, if you attach the pen tip to the cylinder and pass it through the small diameter flange,
Since a ventilation path is always formed, it is possible to provide homogeneous products without variations in ventilation conditions from product to product.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show examples of the writing instrument and pen nib of the present invention.
Figure 1 is a perspective view of the pen nib, Figure 2 is a side view of the barrel with the pen nib attached to the barrel, and Figure 3 is a vertical front view taken along line X-X in Figure 2. Figure 4 is a side view of the cylinder taken along the Y-Y line in Figure 3, Figure 5 is a perspective view of another embodiment of the pen tip, and Figure 6 is a diagram of the other embodiment. FIG. 3 is a longitudinal sectional front view of the pen tip attached to the cylinder. In the figure, 1 is a pen tip, 1-1 is a tip, 1-2 is a rear part, 2 is a cylinder, 2-1 is an inner surface of a tip, 2-1 is an inner surface, and 2-3 is a ridge.

Claims (1)

[Scope of utility model registration request] The pen nib is formed by a polyhedral tip with a wide cross-sectional area and a polyhedral rear part with a narrow cross-sectional area extending from the tip, and the tip and the rear part have one or more side surfaces on the same plane. The cylindrical body that is formed by molding and to which the pen tip is attached has an inner surface of the tip corresponding to the tip of the pen tip formed into a large diameter circle, and a concave groove is provided on the inner surface corresponding to the rear part of the pen tip. A writing instrument with a small diameter rim.