JPH07314Y2 - Double-headed writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a double-headed writing instrument of the same color in which a large-diameter pen body for bold characters and a small-diameter pen body for thin characters are attached to both ends of a barrel.

[Prior art and its problems]

A double-headed writing instrument with a pen attached to both ends of the barrel is 1
Since a book plays two roles as an ordinary writing instrument, various things have been put into practical use, but the tips of a large-diameter pen for bold characters and a small-diameter pen for thin characters protrude from both ends of the barrel. In the same-color double-headed writing instrument, the rear end of each pen body is inserted into the ink occlusion body housed in the barrel, so that the ink in the ink occlusion body is supplied to each pen body during writing. It has become. Even if the large-diameter pen and the small-diameter pen are used at almost the same frequency, the ink in the ink occlusion body is pushed into the air when writing with the large-diameter pen because the ink consumption is large. There is a strong tendency for the pen to move toward the large diameter pen. That is, since the ink in the ink storage body is unevenly distributed to the large-diameter pen body, it is difficult to supply the ink to the small-diameter pen body when writing with the small-diameter pen body, which may cause faint handwriting and ink shortage.

Therefore, if two ink storage bodies for the large-diameter pen body and the small-diameter pen body are used to separate the two, the problem can be solved, but the structure becomes complicated and the number of parts increases. Will end up. Further, when the large-diameter pen body and the small-diameter pen body are used at different frequencies, only the ink of one of the ink occlusion bodies is lost first, and one pen body can write, but the other pen body cannot write. .

[Purpose of device]

Therefore, an object of the present invention is to provide a double-headed writing instrument of the same color which has a simple structure and which is sufficiently supplied with ink even for a small-diameter pen body for fine characters and does not cause fading of handwriting and ink shortage.

[Constitution of the device and its action]

According to the configuration of the present invention, the ink occlusion body is housed in the shaft cylinder, and the tips of the large-diameter pen body for bold characters and the small-diameter pen body for thin characters protrude from both ends of the shaft cylinder so that the ink in the ink storage body In the double-headed writing instrument supplied to the pen body, the ink occlusion body is cut at a position whose volume is approximately proportional to the cross-sectional area ratio of the large-diameter pen body and the small-diameter pen body, and the cut surfaces collide with each other. Is characterized by.

In such a double-headed writing instrument, the ink occlusion body is cut,
Moreover, since the cut surfaces are in contact with each other, the ink is hard to move beyond the cut surfaces. In other words, with a simple structure,
The ink occlusion bodies on both sides are separated incompletely via the cut surface. Therefore, the ink is sufficiently present in the ink occlusion body on the side of the small-diameter pen, and the ink is sufficiently supplied to the small-diameter pen, so that blurring of handwriting and ink shortage are less likely to occur. Moreover, since the cutting position of the ink occlusion body is almost proportional to the cross-sectional area ratio of the large diameter pen body and the small diameter pen body, if the frequency of use of the large diameter pen body and the small diameter pen body is the same, The ink on both sides of the cut surface of the body disappears almost at the same time, and even if the usage frequency is a little unbalanced, the ink moves a little beyond the cut surface, unlike the case where the ink is completely separated at the cut surface. Therefore, it is possible to solve the problem that only one pen body cannot write.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

In FIG. 1, _a tapered portion _1a is formed on one end side of a shaft cylinder 1 made of synthetic resin, and a tapered front port 2 is fitted in an opening on the other end side. Then, the large-diameter pen body 3 for bold characters is inserted into the opening of the tapered portion 1 _a , the tip 3 _a projects from the tapered portion 1 _a , and the small-diameter pen body 4 for small characters is inserted into the opening of the front opening 2. The tip 4 _a projects from the front opening 2.
The shaft cylinder 1 accommodates an ink occlusion body 5 formed by drawing crimped ultrafine fibers into a rod shape, and a large diameter pen body 3 has a rear end portion 3b and a small diameter pen body 4 has a rear end portion 4b. Each is inserted in the ink occlusion body 5.

Here, the ink occlusion body 5 is cut at the cutting portion 6, and the cut surfaces 6 abut each other. That is, the large-diameter pen body side 5a and the small-diameter pen body side 5b of the ink occlusion body 5 have a cut surface 6
Is continuous through. The cutting surface 6 is provided at a position where the volume ratio of the large-diameter pen body side 5a and the small-diameter pen body side 5b of the ink occlusion body 5 is approximately equal to the cross-sectional area ratio of the large-diameter pen body 3 and the small-diameter pen body 4. .

Then, the ink in the ink occlusion body 5 is supplied to the large-diameter pen body 3 and the small-diameter pen body 4, respectively, and is supplied to the writing tool. However, when writing with the large-diameter pen body 3, the ink consumption is large, The ink on the small diameter pen body side 5b also tries to move to the large diameter pen body 5a. However, since the cutting portion 6 exists between them, the cutting portion 6 hardly moves to the large diameter pen body side 5a and remains on the small diameter pen body side 5b. Therefore, when writing with the small-diameter pen body 4, the ink on the small-diameter pen body side 5b is sufficiently supplied to the small-diameter pen body 4, and the blurring of the handwriting and the ink shortage are less likely to occur.

Next, the cutting surface 6 has a volume ratio of the large diameter pen body 5a and the small diameter pen body side 5b of the ink occlusion body 5 to the large diameter pen body 3 and the small diameter pen body 4 respectively.
Since the large-diameter pen body 3 and the small-diameter pen body 4 are used at the same frequency because they are provided at positions substantially equal to the cross-sectional area ratio of
The ink on the large-diameter pen body side 5a and the small-diameter pen body side 5b almost completely disappears. Even if the large-diameter pen body 3 and the small-diameter pen body 4 are used a little unbalanced, the ink slightly moves beyond the cutting surface 6, so that only one of the pen bodies 3 and 4 can write quickly. You can solve the problem that you cannot do it. In order to reduce the movement of the ink on the cut surface 6, a small amount of adhesive may be applied to the cut surface 6.

[Effect of device]

As described above, the double-headed writing instrument of the present invention, in which the pen body for bold type and the pen type for thin type of the present invention are attached to the both ends of the barrel, has the ink occlusion body that has a large volume and a small diameter pen body. The ink is cut at a position approximately proportional to the area ratio, and the cut surfaces are made to abut each other, so the structure is simple and ink is sufficiently supplied to the small diameter pen for fine print to prevent fading of the handwriting and ink shortage. You can scrub with a double-headed writing instrument that does not wake up.

[Brief description of drawings]

 FIG. 1 is a sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Shaft cylinder, 2 ... Front opening 3 ... Large diameter pen body, 4 ... Small diameter pen body 5 ... Ink storage body, 6 ... Cut surface

Claims (1)

[Scope of utility model registration request] 1. An ink occlusion body is housed in a shaft cylinder, and the tips of the large-diameter pen body for bold characters and the small-diameter pen body for thin characters protrude from both ends of the shaft cylinder, and the ink of the ink occlusion body is stored in each pen. In the double-headed writing instrument to be supplied to the body, the ink occlusion body is cut at a position whose volume is approximately proportional to the cross-sectional area ratio of the large-diameter pen body and the small-diameter pen body, and it is confirmed that the cut surfaces collide with each other. Characteristic double-headed writing instrument.