JP6563842B2 - Pay-out writing instrument - Google Patents

Description

  The present invention relates to a pay-out type writing instrument in which a writing body having a pen tip in front is disposed inside a shaft cylinder so as to be able to appear and retract.

Conventionally, in writing instruments, good writing comfort has been regarded as important, and as one of the writing comforts, reduction of fatigue due to writing pressure is considered.
For example, Patent Document 1 and Patent Document 2 propose a structure in which an elastic body is disposed between an ink tank and a shaft cylinder to reduce the force transmitted to the user's hand. According to the ballpoint pens described in both documents, even when the user brings the pen tip into contact with the paper surface with a strong force, the elastic body can reduce the force.

In the ballpoint pen described in Patent Document 1, a coil spring (spring) is disposed between the ink tank (core) and a cap attached to the rear portion of the shaft cylinder. When this coil spring was used as an elastic body, a change in writing pressure during writing led to a forward / backward movement of the pen tip and a feel transmitted to the hand.
In the ballpoint pen described in Patent Document 2, rubber is disposed between the ink tank (core portion) and a cap attached to the rear portion of the shaft cylinder. When this rubber was used as an elastic body, the change in writing pressure at the time of writing led to the forward / backward movement of the pen tip and the feel transmitted to the hand, as in the ballpoint pen of Patent Document 1.

  By the way, as described in Patent Document 1 and Patent Document 2, in the ballpoint pen structure in which an elastic body is disposed between the ink tank and the shaft cylinder, the writing quality is changed and the brush applied to the pen tip is changed. Since the reaction force of the pressure can be released to the elastic body, it is possible to obtain an effect that the wear of the pen tip can be reduced.

However, in the ballpoint pens described in both documents, the effect obtained by deformation of the elastic body is only a functional effect such as improvement in writing quality and durability of the pen tip, and elastic deformation of the elastic body is possible. The situation was not actively shown to users.
In addition, since the ballpoint pens described in both documents employ a coil spring or rubber as an elastic body, a change in writing pressure at the time of writing leads to a forward and backward movement of the pen tip and a feeling transmitted to the hand. In some cases, the direct reaction was not preferred.

Japanese Utility Model Publication No. 49-46827 Japanese Utility Model Publication No. 48-11931

  In view of these facts, the present invention reduces the pressure of writing pressure at the time of writing, reduces the burden on the pen tip and the burden on the hand, and recognizes the situation in which the user visually functions. Therefore, an object of the present invention is to obtain a drawing-type writing instrument in which a change in writing feeling due to elastic deformation of an elastic body is not directly transmitted to a user.

The present invention
“In the shaft tube, a writing body having a pen point in the front is disposed so as to be able to appear and retract, and a gel-like elastic body is disposed between the writing body and a feeding mechanism part for causing the writing body to appear and disappear, A transparent portion for visually recognizing the gel-like elastic body is formed on the shaft cylinder, and the gel-like elastic body compressed between the writing body and the feeding mechanism section at the time of feeding out the writing body is disposed on the shaft cylinder. It is a pay-out type writing instrument having a structure in which the gel-like elastic body is in close contact with the inner surface and can be visually recognized from the transparent portion.

The reaction force of the writing pressure received by the user during writing is reduced by the gel-like elastic body arranged between the writing body and the feeding mechanism part that feeds the pen tip from the shaft tube and supports the writing body. The reaction due to the change in writing pressure at the time becomes gentle due to the characteristics of the gel.
In addition, the gel-like elastic body is compressed so as to be in close contact with the inner surface of the shaft tube at the time of drawing out the writing body, so that it extends and spreads so as to enter the gap between the member provided before and after the inner surface of the shaft tube, It is also possible to recognize more conspicuously the state where the gel-like elastic body is in close contact by the refraction action of the light generated in the transparent part of the shaft tube.
It should be noted that the gel-like elastic body that is compressed at the time of drawing out the writing body needs to be elastically deformed so that the writing pressure can be reduced at the time of writing, and therefore the gel-like elastic body can be further elastically deformed at the time of drawing out the writing body. It is important to make it. Specifically, the size of the gel-like elastic body is set so that the gel-like elastic body is not completely compressed in the front-rear direction at the time of drawing out the cursive body, or the gel is placed in the gap between the front and rear members and the inner surface of the shaft cylinder as described above. What is necessary is just to make it the front-and-rear edge part of a cylindrical elastic body enter.

  According to the present invention, the reaction force of the writing pressure received by the user at the time of writing is reduced by the gel-like elastic body disposed behind the writing body, and the reaction due to the change in writing pressure at that time is a characteristic of the gel. When the cursive is drawn out, the gel-like elastic body is compressed so as to be in close contact with the inner surface of the shaft tube, so that the user can visually recognize the situation in which the elastic body can be elastically deformed. The drawing-type writing instrument which can be obtained was able to be obtained.

It is a longitudinal cross-sectional view of the ball-point pen of a present Example. It is a figure which shows the state which decomposed | disassembled the ball-point pen of a present Example. FIGS. 3A and 3B are diagrams schematically showing a cam operation in the ballpoint pen of the present embodiment. FIG. 3A shows a state where the pen tip is immersed, and FIG. 3B shows a state where the pen tip protrudes. It is a longitudinal cross-sectional view which shows the state which made the pen tip in the ball-point pen of a present Example protrude. It is a longitudinal cross-sectional view in the writing state of the ball-point pen of a present Example.

Hereinafter, the ballpoint pen of the present embodiment will be described with reference to the drawings. In this embodiment, a knock type ballpoint pen using a rotating cam mechanism as a pen tip feeding mechanism will be described, but the present invention is not limited to the following ballpoint pens, such as a fountain pen, a marking pen, or a mechanical pencil. It can also be employed in a pay-out writing instrument.
In this embodiment, the one with the pen tip is expressed as the front, and the opposite side is expressed as the rear. In addition, in order to make the explanation easy to understand, the same reference numerals are given to the same members and the same parts in the drawings.

  FIG. 1 is a longitudinal sectional view of the ballpoint pen of this embodiment. FIG. 2 is a diagram illustrating a state in which the ballpoint pen of this embodiment is disassembled. In the ballpoint pen 1, a writing body 3 having a pen tip 31 is disposed in front of a shaft cylinder 2 in which a front shaft 21 and a rear shaft 22 are screwed together, and a coil spring 4 disposed in front of the shaft cylinder 2. Therefore, the cursive body 3 is repelled backward. The coil spring 4 is locked to a front end portion 32a of an ink tank 32 that stores ink (not shown) of the writing body 3 and an inner stage 21a formed on the inner surface of the front shaft 21, and a rotating cam mechanism to be described later. By operating the part 5 and the writing body 3 moving forward while compressing the coil spring 4, the pen tip 31 can be projected from the tip opening 21 b formed at the front end of the front shaft 21.

A front small diameter portion 33 a of the tail plug 33 is inserted into the rear end of the ink tank 32 of the writing body 3, and a slit 33 b formed in the front small diameter portion 33 a and a hole portion 32 b provided on the side surface of the ink tank 32. These positions are adjusted so that air enters the ink tank 32 as ink (not shown) is reduced by writing.
Further, a collar portion 33 c slightly smaller than the inner diameter of the rear shaft 22 is formed behind the tail plug 33 and protrudes from the rear end of the ink tank 32.

The ballpoint pen 1 of the present embodiment is provided with the conventional rotating cam mechanism 5 that is operated by a knocking operation behind the shaft cylinder 2. The rotating cam mechanism 5 includes a cam groove 22b formed at equal intervals on the circumference of the inner surface 22a of the rear shaft 22 and a cylindrical fixed cam protruding from a rear end opening 22c formed at the rear end of the rear shaft 22. 6 and a cylindrical rotating cam 7 disposed in front of the fixed cam 6.
The fixed cam 6 has a mountain-shaped uneven portion 6a at the tip, and a plurality of protrusions 6b that engage with the cam groove 22b are arranged on the outer surface at equal intervals on the circumference so as to be positioned at the top portion 6c of the uneven portion 6a. Is provided.
An outer peripheral surface of the rotating cam 7 has a plurality of cam projections 7a that engage with the cam grooves 22b, and a meshing portion 7c configured by an inclined surface 7b that meshes with the concavo-convex portion 6a is provided at the rear end of the cam projection 7a. is there.

  A disc member 8 formed slightly smaller than the inner diameter of the rear shaft 22 is disposed in front of the rotary cam 7, and the rear shaft 22 formed behind the disc member 8 and the tail plug 33. A cylindrical gel-like elastic body 9 is disposed between the flange portion 33c having a diameter slightly smaller than the inner diameter of the rod-shaped member.

Next, the ballpoint pen knocking operation of this embodiment will be described with reference to FIGS. FIGS. 3A and 3B are diagrams schematically showing a cam operation in the ballpoint pen of the present embodiment. FIG. 3A shows a state where the pen tip is immersed, and FIG. 3B shows a state where the pen tip protrudes. FIG. 4 is a longitudinal sectional view showing a state in which the pen tip of the ballpoint pen of this embodiment is projected.
As shown in FIG. 3A, the cam mechanism portion 5 of the present embodiment is configured such that when the projection 6b of the fixed cam 6 and the cam projection 7a of the rotating cam 7 are engaged with the cam groove 22b, the uneven portion 6a of the fixed cam 6 is formed. The top portion 6c is positioned at the midpoint of the inclined surface 7b of the meshing portion 7c.
When the knock portion 6d of the fixed cam 6 protruding from the rear end opening 22c of the rear shaft 22 is pushed forward of the shaft cylinder 2, the fixed cam 6 is shallow with the deep cam groove 221b formed on the inner surface 22a of the rear shaft 22. The rotating cam 7 connected to the fixed cam 6 advances by being guided by the protrusion 6b engaged with the cam groove 222b, and advances by being guided by the cam protrusion 7a engaged with the deep cam groove 221b.
When the cam protrusion 7a reaches the tip of the deep cam groove 221b and is detached from the cam groove, the top 6c of the uneven portion 6a of the fixed cam 6 is positioned in the middle of the inclined surface 7b of the meshing portion 7c of the rotating cam 7. At this time, the rotating cam 7 is in contact with the disc member 8 that is spring-backed by the coil spring 4 via the writing body 3 and the gel-like elastic body 9, so that it tries to move backward from the right side to the left side. Rotates (because the inclined surface 7b of the engaging portion 7c is lowered to the right in the figure), the engaging portion 7c of the rotating cam 7 slides on the uneven portion 6a of the fixed cam 6, and the engaging portion 7c of the cam projection 7a is a shallow cam groove. As shown in FIG. 4, the pen tip 31 can be maintained in a state in which the pen tip 31 protrudes from the tip opening 21b.
Further, by pushing the knock portion 6d again forward of the shaft tube 2, the engagement state between the engagement portion 7c of the cam projection 7a and the engagement inclined surface 223b of the shallow cam groove 222b is released, and the coil spring 4 is elastically moved. The emitted rotating cam 7 rotates from the right side to the left side in an attempt to move backward (because the inclined surface 7b of the meshing portion 7c is lowered to the right in the figure), and the cam projection 7a of the rotating cam 7 moves backward in the deep cam groove 221b. As shown in FIG. 1, the pen tip 31 is immersed in the tip opening 21 b.

The gel-like elastic body 9 of this embodiment is formed by Cosmo Super Gel (Asker hardness: 15 degrees) manufactured by Cosmo Keiki Co., Ltd., and is arranged between the rotating cam 7 and the gel-like elastic body 9. The provided disk member 8 is formed of a fluororesin having a good sliding property. Therefore, even if the gel-like elastic body 9 is in close contact with the disk member 8 due to the elastic force of the coil spring 4, the slidability between the rotating cam 7 and the disk member 8 is good, and the rotating operation of the rotating cam 7 is It is smooth.
Further, since the rear shaft 22 of this embodiment is formed of transparent polycarbonate, the entire rear shaft 22 is a transparent portion 22d, and the gel-like elastic body 9 colored in green can be visually recognized.

Next, the state where the ballpoint pen of this embodiment is used will be described with reference to FIGS. 1, 4, and 5. FIG. 5 is a longitudinal sectional view in the writing state of the ballpoint pen of the present embodiment.
As shown in FIG. 4, the gel-like elastic body 9 is compressed by the force springed back by the coil spring 4 through the writing body 3 and is in close contact with the inner surface 22 a of the rear shaft 22. At this time, the front edge portion 9a of the gel elastic body 9 extends so as to enter the gap between the flange portion 33c of the tail plug 33 and the inner surface 22a of the rear shaft 22, and the rear edge portion 9b of the gel elastic body 9 is Further, the gel-like elastic body 9 has a wider width in the front-rear direction so that it is easier to see because the gel-like elastic body 9 is widened so as to enter the gap between the disc member 8 and the inner surface 22a of the rear shaft 22. Further, the inner surface 22a of the rear shaft 22 formed as a curved surface is in contact with the gel elastic body 9, so that the gel elastic body 9 exists in the thick interior 22c of the rear shaft 22 due to the light refraction action. I was able to see it.
By the change of the gel-like elastic body 9, the user can visually recognize the situation where the elastic deformation of the gel-like elastic body 9 is possible, and the pen point 31 of the writing body 3 protrudes from the shaft cylinder 2. It was possible to recognize the state where writing was possible.
Further, as shown in FIG. 5, when the pen tip 31 is pressed against the paper surface 100 and writing pressure is applied during writing, the gel-like elastic body 9 is deformed so as to be further compressed, and the brush received by the user. The reaction force of the pressure was reduced by the gel-like elastic body 9 disposed behind the writing body 3, and the reaction due to the change in the writing pressure at that time became gentle due to the characteristics of the gel.

1 ... ballpoint pen,
2 ... shaft tube,
21 ... front shaft, 21a ... inner stage, 21b ... tip opening,
22 ... rear shaft, 22a ... inner surface, 22b ... cam groove, 22c ... thick inside,
221b ... deep cam groove, 222b ... shallow cam groove, 223b ... locking slope,
22c ... rear end opening, 22d ... transparent part,
3 ... cursive,
31 ... nib,
32 ... Ink tank, 32a ... Front end, 32b ... Hole,
33 ... Tail plug, 33a ... Front small diameter part, 33b ... Slit, 33c ... Buttocks,
4 ... Coil spring,
5: Rotating cam mechanism,
6 ... fixed cam,
6a ... Uneven portion, 6b ... projection, 6c ... top, 6d ... knock portion,
7 ... Rotating cam,
7a ... cam projection, 7b ... inclined surface, 7c ... meshing part,
8: Disc member,
9: Gel-like elastic body,
9a ... front edge, 9b ... rear edge,
100 ... paper.

Claims (1)

Inside the shaft cylinder, a writing body having a pen tip in the front is disposed so as to be able to appear and retract, and a gel-like elastic body is disposed between the writing body and a feeding mechanism portion for causing the writing body to appear and disappear, A transparent portion for visually recognizing the gel-like elastic body is formed on the shaft cylinder, and the gel-like elastic body compressed between the writing body and the feeding mechanism portion at the time of feeding out the writing body is used as an inner surface of the shaft cylinder. A drawing-type writing instrument having a structure in which the gel-like elastic body can be visually recognized from the transparent portion.

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