JPS62945Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, an ink tank for writing instruments such as marking pens has a cap covering the outer surface of the opening of the ink tank body, which houses an ink storage sliver that acts as a capillary tube inside, to prevent leakage of the ink inside. is well known, but in this type of cap, unless the inside of the cap and the outside of the ink tank body into which it is fitted are precisely joined, a fine capillary action will occur between the two. As a result, problems with ink leaking from the same department stopped occurring.

In order to avoid such troubles, the present invention utilizes the characteristics of heating elongation and cooling contraction of the crimped sliver to hold both ends of the sliver in a concave shape from the end face of the ink tank body. A long soft synthetic resin pipe is constructed by coating the circumferential surface of a long synthetic resin sliver with soft synthetic resin using a wire coating method using an extruder and inserting a crimped sliver inside. By cutting the sliver to the required length and leaving it at room temperature for a long time, the crimped state of the sliver that was slightly elongated due to the heating during the synthetic resin coating process using the extruder described above can be removed. The gist is to return the sliver to its original shape and slightly shrink its length, so that the end face of the sliver is slightly recessed from the end face of the ink tank body formed by the above-mentioned cut synthetic resin pipe. It is something to do.

The illustrated example is a long synthetic resin sliver that has been crimped in advance, coated with a soft synthetic resin using a wire coating method using an extruder, and then inserted into the crimped sliver. It consists of a length of soft synthetic resin pipe,
By cutting the sliver into the required length and leaving it at room temperature for a long time, the crimped state of the sliver 1, which was slightly elongated due to the heating during the synthetic resin coating process using the extruder described above, can be removed. The length of the sliver is slightly retracted, and the end face of the sliver is slightly recessed from the end face of the ink tank body 2 formed by the cut synthetic resin pipe. Caps 3 and 3' are tightly fitted into openings at both ends of the ink tank body 2.

Since the present invention is as described above, even if the cap and the ink tank body are not necessarily fitted precisely and capillary action is induced between the inside of the cap and the ink tank body, the ink can be absorbed. Because the end surface of the sliver is slightly recessed from the opening end of the ink tank body, the end surface of the sliver and the bottom surface of the top of the cap come into contact with each other, causing capillary action there and capping the ink. Since there is no leakage between the inner surface of the body of the ink tank and the outer surface of the ink tank body, it is possible to reliably avoid the trouble of ink leakage due to capillary action as described above. consists of a long soft synthetic resin pipe in which the peripheral surface of a long synthetic resin sliver is coated with soft synthetic resin using a wire coating method using an extruder, and a crimped sliver is inserted inside. By cutting the sliver into lengths and leaving it at room temperature for a long time, the crimped state of the sliver, which had been slightly elongated due to the heating during the synthetic resin coating process using the extruder described above, can be restored to its old state. The length of the sliver was slightly contracted so that the end surface of the sliver was slightly recessed from the end surface of the ink tank body formed by the above-mentioned cut synthetic resin pipe, so both ends of the sliver were There is an effect that the shape recessed from the opening edge of the ink tank body can be extremely easily constructed.

[Brief explanation of the drawing]

The figures show an embodiment of the ink tank for a writing instrument such as a marking pen according to the present invention, in which Fig. 1 is a perspective view of the whole, and Fig. 2 is an enlarged cross-sectional view of the main part. 1: sliver, 2: ink tank body,
3...Cap.

Claims (1)

[Scope of utility model registration request] A long soft synthetic resin pipe is made by coating a soft synthetic resin on the circumference of a long synthetic resin sliver that has been crimped in advance using a wire coating method using an extruder, and then inserting the crimped sliver inside. By cutting the sliver into required lengths and leaving it at room temperature for a long time, the sliver is slightly elongated and crimped due to the heating during the synthetic resin coating process using the extruder described above. A marking pen in which the sliver is returned to its old state and its length is slightly contracted, and the end face of the sliver is slightly recessed from the end face of the ink tank body formed by the cut synthetic resin pipe. Ink tank for writing instruments such as.