JPH0223422Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention was made with the aim of controlling the quality variation of a small tube type writing instrument in which the pen tip is composed of a small tube and a rod that is slidably arranged inside the small tube. It is something.

An example of a small tube type writing instrument having the above-mentioned type of nib will be explained based on the attached FIG. 1. Reference numeral 1 is a tip attached to the tip of the barrel A;
A small tube 2 made of metal or the like is protruded and supported at the tip of the chip 1. A rod 3 is slidably disposed within the small tube 2, and its rear end 3a is supported by an elastic liquid-containing material 4 such as urethane foam inserted into the hole 1a of the tip 1. Since the liquid containing liquid also guides the ink, it is hereinafter referred to as an ink conductor, and this ink conductor 4
An ink relay core 5 made of a fiber bundle or the like is arranged behind the ink relay core 5, and an ink absorber (not shown) made of batting or the like stored in the shaft tube A or a raw ink type writing instrument is placed behind the ink relay core 5. The ink is connected to a comb-shaped ink reservoir member (so-called bellows) in the ink tank, and the ink is supplied from these members to the writing surface through the ink relay core 5, the ink conductor 4, and the gap between the rod 3 and the small tube 2. Ru. Here, the ink conductor 4
has both the functions of applying sliding force to the rod 3 and conducting ink, and therefore has a great relationship with the quality of the writing instrument.

However, although the ink conductor 4 may be small in size, it is quite difficult to position it between the rod 3 and the rear end 3a of the rod 3 when assembling the writing instrument.
As a result, the rod 3 undergoes deformation that varies in quantity, which causes variations in the ability to apply sliding force to the rod 3 and variations in ink conductivity. In particular, since ink conductivity is one of the basic qualities of a writing instrument, improving its reliability is an extremely important consideration.

The present invention has been developed from the above-mentioned viewpoints, and will be described below with reference to the accompanying drawings.

In FIG. 2 showing an embodiment of the present invention, the first
Components that are basically the same as those in the figure are given the same reference numerals, but the biggest difference from FIG. 1 is in the ink conductor 4. That is, the ink conductor 4 in FIG. 2 includes an elastic body 4a made of rubber or the like and responsible for imparting sliding force to the rod 3, and a cover body 4b covering the side wall of the elastic body 4a and responsible for ink conduction. It's getting more and more familiar. The cover body 4b is made of, for example, a fiber bundle or a resin sintered body, and is harder than the elastic body 4a.

If the cover body 4b serves as a carrier for ink conduction and therefore has an ink passage, it can take various forms such as being made into multiple parts. for example,
FIG. 3 shows another embodiment of the present invention, in which the cover body 4 of the ink conductor 4 in FIG.
b has an ink passage 4c of an inner groove type, as shown in FIG. In addition, as shown in FIGS. 5 and 6, a through-type or outer groove-type ink passage 4c is also provided.
Of course, it may have a combination of various ink passages.

Furthermore, the diameter of the ink conductor 4 in FIG. 3 is reduced at the tip, but this is because when the elastic body 4a is relatively hard like a solid body for a porous body,
It is useful for gently applying sliding force to the surface.

Several methods for covering the cover body 4b on the elastic body 4a will be described below. For example, in the case of the cover body 4b such as a sintered body, it seems easiest to fit together pre-formed pieces, but for example, in the case of the cover body 4b made of a fiber bundle, when the fibers are bundled, In addition, in the case of the cover body 4b made by extrusion molding such as a self-fusion method of monofilament, when molding the cover body 4b, as in the case of extrusion molding, the elastic body 4a is added in the same manner as for covering electric wires. It is easy to cover the

As exemplified above, the small tube type writing instrument of the present invention,
As an ink conductor that is responsible for applying sliding force to the rod and ink conduction, the side wall of the elastic body that is responsible for applying sliding force to the rod is covered with a hard cover body that is responsible for ink conduction. Even if positioning variations occur, they do not cause substantial variations in ink conductivity, so a product with stable ink conductivity can be obtained. Furthermore, if the elastic body has ink conductivity, variations in ink conductivity will occur due to positioning variations, but the variation will be reduced by the ink conductivity of the cover body. This also has a practical effect in that the material of the elastic body can be selected from a wide range of applications.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the main parts of a conventional small tube type writing instrument.
FIG. 2 is a vertical cross-sectional view of the main part showing an embodiment of the present invention;
FIG. 3 is a vertical sectional view of main parts showing another embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line -
FIG. 6 is a cross-sectional view showing another embodiment corresponding to FIG. 4. 1...chip, 2...tubule, 3...rod, 4...
...Ink conductor, 4a...Elastic body, 4b...Cover body, 5...Ink relay core.

Claims (1)

[Scope of utility model registration request] A pen tip is constituted by a small tube and a rod that is slidably disposed within the small tube, and a sliding force is applied to the rod by an elastic ink conductor that is placed behind the rod. A small tube type writing instrument, characterized in that the ink conducting body is made by covering a side wall of an elastic body with a cover body that is harder than the elastic body and has an ink passage.