JPH0318221Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a dual-shaft writing instrument shaft of this kind, such as felt-tip pens and ballpoint pens, on which letters, pictures, etc. are beautifully expressed on the outer surface.

[Conventional technology]

This type of writing instrument barrel has been around for a long time, and it was simply a long barrel with various characters or color patterns printed on the outside, or a transparent coating layer was provided on the outside of the pattern, so the pattern was simply that. It lacked interest because it could only be seen through, and especially in the case of the former, it also had the disadvantage that the letters and patterns were easily faded and peeled off.

Therefore, there is a writing instrument shaft that is made of a double shaft made of synthetic resin, which has an inner cylinder with a colored pattern on the outer surface and a transparent outer cylinder fitted on the outside. This is uninteresting because, like objects, it can only be seen through.

[Problem that the invention attempts to solve]

Unlike the conventional ones mentioned above, this invention is of course free from fading and peeling of the color pattern around the shaft, but it is also interesting in that it gives a vibrant beauty to the text pattern area in particular. We offer this kind of beautiful dual-shaft writing instrument shaft.

[Means for solving problems]

That is, in this case, an external cylinder made of transparent synthetic resin is provided with holes having a regular polygonal cross section such as pentagonal or octagonal in the inner axis direction, and letters and color patterns are printed on the outer surface of the cylinder inside the holes. An inner cylinder made of a synthetic resin is inserted thereinto to form a prismatic cavity at intervals between the inner and outer cylinders, and the overlapping tips of the inner and outer cylinders are formed into an integral shaft tip.

[Effect]

Since the present invention is constructed as described above, the incident light from the outside of the outer cylinder enters and reflects in a crossed manner through each prism-shaped cavity formed between the inner surface of each corner of the insertion hole and the outer surface of the inner cylinder. Since the brilliance is added to the pattern on or around the outer surface of the inner cylinder, the colored pattern appears with brilliance, thus producing an extremely interesting aesthetic effect. However, in this writing instrument, the overlapping tips of the inner and outer cylinders are formed into an integral shaft tip, so even though there is a prismatic space between the inner and outer cylinders, there is no risk of the cylinders shifting accidentally, so writing can be done easily. .

〔Example〕

An outer cylinder 1 made of transparent synthetic resin is provided with a hole H having a hexagonal cross section pierced in the inner axial direction, and an inner cylinder 2 with letters and a color pattern M printed on the outer surface is inserted into the hole of the cylinder. A synthetic resin writing instrument shaft is formed by forming a prismatic cavity R between the inner and outer cylinders, and drawing the overlapping tips of the inner and outer cylinders to form an integral truncated conical shaft tip part 3.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the outer cylinder made of transparent synthetic resin according to the present invention, Figure 2 is a slope view of the inner cylinder, Figure 3 is a partial external side view of the writing instrument of the present invention, and Figure 4 is the A--
It is an enlarged sectional view taken along the A line. 1 is the outer cylinder, 2 is the inner cylinder, 3 is the shaft tip,
H is a hole, M is a letter, a color pattern, R is a prismatic cavity.

Claims (1)

[Scope of utility model registration request] A composition in which an external cylinder made of transparent synthetic resin is provided with a hole having a regular polygonal cross section such as a pentagon or octagon in the inner axial direction, and letters, colored pictures, etc. are printed on the outer surface of the cylinder in the hole. A writing instrument shaft made of synthetic resin, in which an inner cylinder made of resin is inserted and a porism-like cavity is formed between these inner and outer cylinders, and the overlapping tips of the inner and outer cylinders are formed into an integral tip part.