JPH0617576Y2 - Elastic structure for pen tip - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) Elasticity is given to a rigid nib that cannot be expected to have elasticity, although it depends on the shape, such as ceramics such as alumina and zirconia, and metals. Related to the structure.

(Prior Art) It is already known to use a resilient member to impart a soft writing touch to a rigid nib. For example, in a general low-cost ballpoint pen in which oil-based ink is contained in an ink container made of synthetic resin, rather than projecting only a part of the metal tip from the tip of the barrel, the front end of the ink container, which can be expected to have elasticity, is used. It is known that even a part of the portion is projected, and the description of the scope of claim for utility model registration is "a plate-shaped pen nib formed by joining a ceramic plate to the writing side and an elastic plate." Aru Kaisho 61-6
There is also a 2074 publication.

(Problems to be solved by the invention) Conventional techniques may be sufficient depending on the type of writing instrument. However, a writing instrument having a temporary ink reservoir member made of a synthetic resin and having a temporary ink reservoir groove having a comb-shaped vertical cross section between a pen tip and an ink tank, that is, a so-called raw ink type writing instrument However, in the case of giving elasticity to the pen tip, a typical thing is that the conventional idea is to use a member that exhibits elasticity separately, so even if it is not so I had made it.

The present invention has been made in view of the above points, and an object of the present invention is to provide a structure for providing elasticity to a pen tip that is structurally simple.

(Means for Solving the Problems) The present invention provides a temporary synthetic resin resin having a comb-shaped temporary ink reservoir groove between a rigid nib having writing direction and an ink tank. A structure for imparting elasticity to the pen tip of a writing instrument with a temporary ink reservoir member interposed between the temporary ink reservoir groove of the temporary ink reservoir member and the deeper depth of the groove near the pen tip. The thin portion formed by this is an elastic portion, and this elastic portion is located on the pen tip side of the fixing portion of the temporary ink reservoir member to the shaft cylinder, and outside the fixing portion where the thin portion is present. A gist is a structure for imparting elasticity to a pen tip having a gap between a shaft cylinder and a temporary ink reservoir member.

(Example) An example is shown in attached FIG. 1 to FIG. The drawing shows a temporary ink reservoir. 1 is a side view, FIG. 2 is a top view, FIG. 3 is a cross-sectional view taken along the line I-I of FIG. 1, FIG. 4 is a cross-sectional view taken along the line II-II, and FIG. It is a front view when seeing from the right side. The dotted lines in FIGS. 2 and 5 indicate that the pen tip is thus attached to the temporary ink fountain member.

The illustrated temporary ink reservoir member A is an example of what is generally called a bellows, and includes a temporary ink reservoir groove 1 having a comb-like vertical cross section and a slit 2 serving as an ink passage from a cartridge (not shown). And a relatively wide slit 3 for air exchange. Synthetic resin products such as polyethylene, polypropylene, ABC and AS. Normal,
Obtained by injection molding.

In the temporary ink reservoir member A, the temporary ink reservoir groove 1 has a deeper depth in the vicinity of the pen tip, that is, in the third position (from the right side) in the drawing. That is, comparing FIG. 3 with FIG. 4, the one in FIG. 4 does not have the left and right portions and the lower portion of the meat portion. This thin portion 4 becomes a portion that gives elasticity to the pen tip.

Next, FIGS. 6 and 7 attached show the state of attachment to the barrel. Although reference is made to an example of a modification, the same reference numerals are basically used. In the shaft cylinder indicated by a new reference numeral 5, the inner hole on the tip side (right side in the drawing) is the large diameter portion 5a. Of the temporary ink reservoir groove 1 of the temporary ink reservoir member A, the fourth one from the right side in the above-mentioned one is eliminated, the meat portion of this portion is made slightly larger in diameter, and that portion is press-fitted into the barrel 5. It is a part. Further, a thin portion 4 is formed by deepening the depth of the temporary ink reservoir groove 1 all around the pen tip side of the temporary ink reservoir groove 1.

These two figures show that:

First, the temporary ink reservoir member A is fixed to the shaft cylinder 5 by press fitting the whole into the inner hole of the shaft cylinder 5, or by forming a small diameter part in a part of the inner hole of the shaft cylinder 5 May be used as a press-fitting portion, or may not be press-fitting.
In any case, the thin portion 4 is outside the fixed portion, and at that time, a thin portion can be appropriately formed for fixing, and
The thin portion 4 can also be formed in an appropriate number and in an appropriate number.

As can be seen from these two figures, when writing pressure is applied to the pen tip, the temporary ink reservoir member A is elastically deformed at the thin portion 4 because it is made of synthetic resin, and the pen tip also responds accordingly. Make a reasonable displacement. Of course, the amount of deformation may be appropriately controlled, and for that reason, the gap between the shaft cylinder 5 and the temporary ink reservoir A outside the fixed portion where the thin portion 4 is present can be set appropriately.

Although not shown, various other than the above can be made. For example, a writing instrument adopting the structure of the present invention does not use any elastic member. Elastic members are used at appropriate places for appropriate purposes, such as O-rings for preventing ink leakage. Further, the temporary ink reservoir member A does not have to have all of the temporary ink reservoir grooves having a comb-shaped vertical cross section. It is also possible to form an appropriate temporary ink fountain groove shape partially. Further, the above-mentioned thing is illustrated in consideration of the pen tip having a shape similar to that of a fountain pen. However, the shape of the pen tip is appropriate, and its attachment is also appropriate. It can also be indirectly fixed to the temporary ink reservoir member A. Therefore, the shape of the temporary ink reservoir member itself is also appropriate. Further, there are various structures of the temporary ink reservoir member itself having the temporary ink reservoir groove having a comb-shaped vertical section. Those can be selected appropriately. For example, the illustrated one has one slit formed for the ink passage. However, there is also one having a through hole, and an ink relay member is inserted into the through hole as necessary so that the through hole serves as an ink passage. Again, a thin portion can be similarly formed.

(Effect of the Invention) A temporary ink reservoir member having a temporary ink reservoir groove having a comb-like longitudinal section is interposed between the pen tip and the ink tank, which tends to be structurally more complicated than other writing instruments. It is possible to impart elasticity to the pen tip with a simple structure in which a separate member is not used as a member exhibiting elasticity for the writing instrument thus obtained.

[Brief description of drawings]

FIG. 1 is a side view of a temporary ink reservoir member showing an example of the present invention, FIG. 2 is a top view thereof, FIG. 3 is a cross-sectional view taken along the line I--I of FIG. 1, and FIG. II transverse cross-sectional view, FIG. 5 is a front view of the same, FIG. 6 is a side cross-sectional view of an essential part showing a mounting state and a modification, and FIG. A: Temporary ink reservoir member, 1 ... Temporary ink reservoir member, 2 ... Ink passage slit, 3 ... Relatively wide slit for air exchange, 4 ... Thin portion, 5 ... Shaft Cylinder.

Claims (1)

[Scope of utility model registration request] 1. A temporary ink reservoir member made of synthetic resin having a temporary ink reservoir groove having a comb-like vertical cross section is interposed between a rigid nib having a writing direction and an ink tank. In the structure for imparting elasticity to the pen tip of the writing instrument, the temporary ink fountain groove of the temporary ink fountain member is made deeper in the vicinity of the pen tip, and the thin wall formed by this is formed. The portion is an elastic portion, and the elastic portion is located on the pen tip side of the fixed portion of the temporary ink reservoir member with the shaft cylinder, and the thin cylinder portion is present outside the fixed cylinder and the temporary ink reservoir member. A structure that gives elasticity to the pen tip with a gap between and.