JPH0237578Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a writing instrument pen body made of synthetic resin used for writing instruments such as marking pens and felt-tip pens. The present invention relates to a pen body for a writing instrument which allows clear handwriting to be obtained at all times without narrowing the hole.

Hitherto, a variety of pen bodies for writing instruments made of synthetic resin having an ink passage hole of an appropriate cross-sectional shape in the axial direction have been widely used and known for reasons such as a good writing touch and being advantageous for writing in fine print. When attaching these pen bodies to a holder, etc., fix the pen body by caulking a part of the holder inward, or press fit the pen body with a step into the holder, and then press the pen body into the holder. The pen body was also fixed at the step by blocking or by gluing. However, according to these methods, the ink passage holes provided through the pen body tend to be narrowed or blocked by caulking, and as a result, the ink passage holes are not large enough to supply ink. It becomes difficult to secure, leading to ink fading,
In the case of , it is difficult to obtain clear handwriting, and not only does it have the same problem as in the case of , but it also requires advanced technology to achieve the precision in forming the steps, and there are variations from product to product. In some cases, the quality is unsatisfactory, with some items not being able to be fixed properly due to scratches, and in other cases, it takes a certain amount of time for the adhesive to dry completely, and depending on the ink used, the adhesive may deteriorate. Both methods have drawbacks such as restrictions on selection, and there remains room for improvement in both methods.

The present invention was developed in view of the above-mentioned current situation, and is an attempt to solve the various drawbacks of the conventional pen body by making simple improvements to the synthetic resin writing instrument pen body itself.

The gist of the present invention is to provide a pen body for a writing instrument made of synthetic resin with an ink passage hole of an appropriate cross-sectional shape in the axial direction, and to provide a protruding rib on the outer wall of the pen body over the entire length in the axial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pen body for a writing instrument is characterized in that a relaxation hole for fixing the pen body is provided in the inner part of a rib, and the present invention will be described in detail below based on an embodiment shown in the accompanying drawings.

Reference numeral 1 indicates polyacetal, nylon, polyester, etc., with ink passage holes 2 running through them in the axial direction.
A writing instrument pen body made of synthetic resin such as polypropylene, the writing instrument pen body 1 has a protruding rib 3 along the entire length in the axial direction on its outer wall, and along with this, the inner side of the protruding rib 3 A relaxation hole 4 for fixing the pen body is provided through the entire length of the pen body in the axial direction. The shapes of the ink conduction holes and the relaxation holes in the cross section of the writing instrument pen body are not limited to those in this embodiment, and various conventionally known shapes can be adopted as the ink conduction holes. Similarly, there is no problem even if a plurality of through holes are provided as long as they are located inside the protruding rib. Note that the number of protruding ribs is not limited to this, and one or more ribs may be provided.

When manufacturing such a pen body for writing instruments, extrusion molding is used, and the material obtained by this is cut as appropriate and the tip is made into a hemispherical shape. The cross-sectional shape of the nozzle is a protrusion rib in the cross-section of the desired writing instrument pen body,
If the shape of the relaxation hole is adjusted in advance, the pen body as described above can be easily obtained.

When actually attaching the writing instrument pen body of the present invention to the holder, as shown in FIGS. The writing instrument pen body 1 can be easily attached by penetrating the pipe 6 and caulking the tip end of the pipe 6 inward at a point or around the entire circumference. Even if the protruding rib 3 is depressed inward by caulking, the ink passage hole 2 will not be narrowed or blocked because the relaxation hole 4 is provided in the inner part of the protruding rib 3. This ensures a reliable flow of ink at all times. In the above embodiment, the pipe 6 is caulked when attaching the writing instrument pen body 1 to the holder 5, but it may also be simply press-inserted.

As described above, the present invention provides a pen body for a writing instrument made of synthetic resin in which an ink passage hole of an appropriate cross-sectional shape is formed in the axial direction, and a projecting rib is provided on the outer wall of the pen body over the entire length in the axial direction. A relaxation hole for fixing the pen body is provided in the inner part of the protruding rib, so when attaching the writing instrument pen body to a holder, the ink conduction hole will not be removed even if the holder is caulked or press-fitted into the holder. It is possible to secure an ink passage hole that is not narrowed or blocked, and ensures smooth ink supply at all times, resulting in clear handwriting.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of the main part when the writing instrument pen body is attached to the holder, and FIGS. 2 and 3 are - in FIG. 1.
FIG. 1... Writing instrument pen body, 2... Ink conduction hole,
3... Projection rib, 4... Relief hole.

Claims (1)

[Scope of utility model registration request] In a pen body for a writing instrument made of synthetic resin having an ink passage hole of an appropriate cross-sectional shape in the axial direction, a protruding rib is provided on the outer wall of the pen body over the entire length in the axial direction, and the inner part of the protruding rib is provided with a protruding rib on the outer wall of the pen body. A pen body for a writing instrument characterized by having a relaxation hole for fixing the pen body.