JP2023117802A - ballpoint pen - Google Patents

Abstract

To provide a ballpoint pen that is hard to adversely affect the environment when disposed of.SOLUTION: A ballpoint pen 1 according to the present invention includes: a core material 10 having an ink container 11 and a pen tip 13 provided at one end of the ink container 11; a barrel 20 provided around the ink container 11; a grip 30 that holds the end of the barrel 20 on the pen tip side; and a cap 40 that holds the end of the barrel 20 opposite to the pen tip. The barrel 20 is formed of a paper sheet material wrapped around the ink container 11.SELECTED DRAWING: Figure 3

Description

The present invention relates to ballpoint pens.

A ball-point pen that is widely used as a writing instrument generally has a core member having an ink container and a pen tip, and a barrel in which the core member is accommodated. The barrel is generally made of resin, as described in Patent Document 1, for example.

In such a ball-point pen, the core material is provided to be replaceable, and when the ink container runs out of ink, it can be replaced with a new core material.

JP 2021-35777 A

However, even if the ink runs out, the core material is not necessarily replaced with a new one, and the entire barrel may be discarded. Resin-made shaft cylinders are so-called plastic waste, and in view of the growing environmental problems in recent years, it is not preferable to dispose of such plastic waste.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a ball-point pen which is less likely to adversely affect the environment when discarded.

The ball-point pen of the present invention comprises: a core material having an ink container; a pen tip provided at one end of the ink container; a barrel provided around the ink container; A grip that holds an end on the pen tip side and a cap that holds an end of the barrel on the side opposite to the pen tip, wherein the barrel is wound around the ink container. It is characterized by being formed of a sheet material made of paper.

In the present invention, the sheet material may be adhered to the ink container.

The present invention may be characterized in that the grip is slidable in the axial direction of the barrel between a use position in which the pen tip protrudes and a storage position in which the pen tip is accommodated.

According to the present invention, since the barrel is made of paper sheet material, even if the core material is discarded, the amount of discarded plastic waste can be reduced.

1 is a perspective view showing a ballpoint pen (with a grip slid to a use position) according to an embodiment of the present invention; FIG. 1 is a perspective view showing a ballpoint pen according to an embodiment of the present invention (with the grip slid to the storage position); FIG. 1 is a partial cross-sectional view showing a ball-point pen according to an embodiment of the present invention (with the grip slid to the use position); FIG. 1 is a partial cross-sectional view showing a ballpoint pen according to an embodiment of the present invention (with the grip slid to the storage position); FIG. 1 is an exploded perspective view showing a ballpoint pen according to an embodiment of the present invention; FIG. 1 is a plan view of a sheet member forming a barrel in a ballpoint pen according to an embodiment of the present invention; FIG. FIG. 5 is a plan view showing another example of the sheet material forming the barrel in the ballpoint pen according to the embodiment of the present invention. 1 is a perspective view showing how a sheet material is wound around a core material in a ballpoint pen according to an embodiment of the present invention; FIG. It is a partial cross-sectional view showing another example of the ball-point pen of the embodiment of the present invention.

1A and 1B, 2A and 2B, 3, 4A, 4B, and 5, a ballpoint pen 1 according to an embodiment of the present invention will be described. 1A and 1B are perspective views showing the ballpoint pen 1, FIGS. 2A and 2B are partial cross-sectional views showing the ballpoint pen 1, FIG. 3 is an exploded perspective view showing the ballpoint pen 1, and FIGS. 4A and 4B show the sheet material 50. 5 is a plan view, and FIG. 5 is a perspective view showing how the sheet material 50 is wound around the core material 10. As shown in FIG.

As shown in FIGS. 2A, 2B, and 3, the ballpoint pen 1 includes a core 10, a barrel 20 provided around the core 10, and a grip 30 holding one end of the barrel 20. , and a cap 40 that holds the other end of the barrel 20 .

First, the core material 10 and the barrel 20 will be described. As shown in FIGS. 2A, 2B, and 3, the core material 10 includes an ink containing body 11 containing black or color ink, and a pen tip 13 provided at one end of the ink containing body 11. have. The ink container 11 has a small-diameter portion 11a and a large-diameter portion 11b which are coaxially provided, and the pen tip 13 is provided at the tip of the small-diameter portion 11a. In the following description, the side of the pen tip 13 is defined as the leading end side, and the side opposite to the pen tip 13 is defined as the rear end side. Moreover, the axial direction indicates the axial direction of the core material 10 .

The shaft cylinder 20 is formed of a sheet material 50 (see FIGS. 4A and 4B) wound around the large diameter portion 11b of the ink container 11. As shown in FIG.

The sheet material 50 will be described with reference to FIGS. 4A and 4B and FIG. As shown in FIGS. 4A and 4B, the sheet material 50 has a rectangular planar shape. The length L1 of the sheet material 50 along the axial direction is slightly shorter than the length L2 (see FIGS. 2A and 2B) of the large diameter portion 11b along the axial direction. The basis weight of the sheet material 50 is 80-160 g/m ² , preferably 100-130 g/m ² . Also, the sheet material 50 preferably has water resistance. Alternatively, the surface of the sheet material 50 may be treated with polypropylene to improve water resistance and durability. Alternatively, the paper may be coated with a water resistant and durable paint. Also, the sheet material 50 is preferably made of a recyclable material.

When the sheet material 50 is wound around the large-diameter portion 11b of the ink container 11, as shown in FIG. 4A, the sheet material 50 is adhered to the winding start side end 50X and the winding end side end 50Y of the back surface of the sheet material 50. Apply Agent A. Then, as shown in FIG. 5, the leading edge of the sheet material 50 is aligned with the leading edge of the large-diameter portion 11b, and the adhesive A is applied along the axial direction of the winding-starting edge 50X. 5, and then a plurality of layers (for example, 5 to 6 layers) are wound along the large diameter portion 11b as indicated by the arrows in FIG. Finally, the end portion 50Y on the winding end side is adhered to the surface of the wound sheet material 50 with an adhesive A. As shown in FIG. As described above, the length L1 of the sheet material 50 along the axial direction is shorter than the length L2 of the large diameter portion 11b along the axial direction. is exposed from the barrel 20. Adhesive A is preferably a peelable and re-adhesive adhesive.

Alternatively, the adhesive A may be applied to the entire back surface of the sheet material 50, as shown in FIG. 4B. In this case, after the end portion 50X on the winding start side is attached to the large-diameter portion 11b with the adhesive A along the axial direction, it is attached to the surface of the attached sheet material 50 while being wound around the large-diameter portion 11b. To go.

In addition, it is preferable that the four corners of the sheet material 50, particularly the two corners of the end portion 50Y on the winding end side, are rounded. By rounding the corners, it becomes difficult for the corners of the sheet member 50 to turn up after being attached to the large diameter portion 11b.

Alternatively, as shown in FIG. 6, the length L1 of the sheet material 50 along the axial direction may be the same as the length L2 of the large diameter portion 11b along the axial direction. In this case, the rear end portion of the large diameter portion 11b of the ink container 11 is not exposed from the barrel 20. As shown in FIG.

Next, the grip 30 will be explained. The grip 30, as shown in FIGS. 1A to 2B, is a part that is attached to the end of the barrel 20 on the tip side and gripped by the user during writing. The grip 30 is made of flexible resin such as silicon. Since the grip 30 has a certain degree of flexibility, it is difficult for the user to feel tired even when holding the grip 30 for a long time during writing.

A through hole 31 is formed through the grip 30 in the axial direction. As shown in FIGS. 2A and 2B, the through hole 31 has a small diameter portion 31a on the front end side and a large diameter portion 31b on the rear end side. The portion 11a is housed therein, and the tip end of the barrel 20 is housed in the large-diameter portion 31b. A gap is formed between the small diameter portion 11 a of the pen tip 13 and the ink container 11 and the small diameter portion 31 a of the through hole 31 . On the other hand, the outer peripheral surface of the barrel 20 is in contact with the inner peripheral surface of the large diameter portion 31 b of the through hole 31 .

The grip 30 is axially slidable with respect to the barrel 20 . When the grip 30 is slid to the rear end side with respect to the barrel 20, the end face of the large diameter portion 31b of the through hole 31 comes into contact with the end face of the large diameter portion 11b of the ink container 11 as shown in FIG. 2A. Then, the pen point 13 protrudes from the through hole 31 of the grip 30 (see also FIG. 1A). Writing is possible by protruding the pen tip 13 in this manner. This position of the grip 30 is the use position. On the other hand, when the grip 30 is slid to the distal end side with respect to the barrel 20, the pen tip 13 is accommodated in the through hole 31 as shown in FIG. 2B, and the pen tip 13 is protected (FIG. 1B see also). This position of the grip 30 is the storage position. Grip 30 is maintained in the use and storage positions by friction with barrel 20 .

Next, the cap 40 will be explained. The cap 40 is attached to the end of the barrel 20 on the rear end side, as shown in FIGS. 1A to 2B. The cap 40 is a substantially columnar member along the axial direction, and the end surface on the rear end side is curved in a hemispherical shape. A hole 41 is formed in the cap 40 along the axial direction from the end face on the tip side. The hole 41 has a large-diameter portion 41a, a medium-diameter portion 41b, and a small-diameter portion 41c in order from the tip side. The rear end portion of the large-diameter portion 11b of the container 11 is accommodated. The end surface of the large diameter portion 11b is in contact with the end surface of the intermediate diameter portion 41b. The cap 40 is fixed by friction between the rear end portion of the barrel 20 and the rear end portion of the large diameter portion 11b of the ink container 11 . The cap 40 is made of synthetic resin or silicon resin, for example.

As shown in FIG. 6, when the axial length L1 of the shaft cylinder 20 is equal to the axial length L1 of the large-diameter portion 11b of the ink container 11, the cap 40 is The hole 41 has a large-diameter portion 41a and a small-diameter portion 41b in order from the front end side. is in contact with the end face of the

1A, 1B, and 3, the cap 40 is provided with a hook 43 that can be hooked on a pocket or the like.

When using the ball-point pen 1 having the above configuration, the grip 30 is slid from the storage position to the use position to protrude the pen tip 13 from the grip 30 as shown in FIG. 1A. After use, the pen tip 13 can be protected by sliding the grip 30 from the use position to the storage position to store the pen tip 13 in the grip 30, as shown in FIG. 1B.

Also, when replacing the core material 10 of the ball-point pen 1 when the ink runs out, the grip 30 and the cap 40 are pulled out from the barrel 20 . Since the grip 30 and the cap 40 are in contact with the barrel 20 only by friction, they can be easily pulled out. Then, the sheet material 50 of the barrel 20 is peeled off from the ink container 11 . When the peelable and re-adherable adhesive A is used, the sheet material 50 can be easily peeled off from the ink container 11 . When using a new core material 10, the new sheet material 50 or the peeled sheet material 50 is attached while being wound around the ink container 11 of the core material 10 as described above. When the ink runs out and the core material 10 is discarded, the grip 30 and the cap 40 are extracted from the barrel 20, the sheet material 50 of the barrel 20 is peeled off, and then the core material 10 and the sheet material 50 are separated. , dispose of or reuse in a prescribed manner.

As described above, according to the ball-point pen 1 of the present invention, the barrel 20 is made of the sheet material 50 made of paper. can be reduced. Furthermore, if a recyclable material is used for the sheet material 50, the sheet material 50 can be reused, which is more preferable from the environmental point of view. Moreover, since the sheet material 50 is fixed in a wound state by the adhesive A, peeling of the sheet material 50 can be suppressed. Furthermore, since both ends in the axial direction of the wound sheet material 50 are held by the grip 30 and the cap 40, peeling of the sheet material 50 can be reliably suppressed.

Also, a desired design can be printed on the surface of the sheet material 50 . In the case of the conventional resin barrel 20, mass production is required in order to change the design. However, by using the sheet material 50 of the present invention, it becomes possible to print freely even in a small amount, and original ball-point pens 1 with various designs can be provided.

Further, by setting the basis weight of the sheet material 50 to 80 to 160 g/m ² , preferably 100 to 130 g/m ² , the barrel 20 can be provided with appropriate strength.

The present invention can be applied to a pen with a replaceable core material other than the ball-point pen 1 .

In addition, since the above description of the embodiment of the present invention describes the preferred embodiment of the ballpoint pen according to the present invention, various technically preferable limitations such as material, size, structure, etc. are attached. However, the technical scope of the present invention is not limited to these embodiments unless otherwise specified.

1 ballpoint pen 10 core material 11 ink container 13 pen tip 20 barrel 30 grip 40 cap

Claims (3)

a core material having an ink container and a pen tip provided at one end of the ink container;
a shaft cylinder provided around the ink containing body;
a grip that holds the end of the barrel on the pen tip side;
a cap that holds the end of the barrel opposite to the pen tip,
A ball-point pen, wherein the shaft cylinder is formed of a sheet material made of paper wound around the ink container. 2. A ball-point pen according to claim 1, wherein said sheet material is adhered to said ink container. 3. The ballpoint pen according to claim 1, wherein the grip is slidable in the axial direction of the barrel between a use position in which the pen tip is projected and a storage position in which the pen tip is accommodated.

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