JP3308376B2 - Extendable writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extended writing instrument.

[0002]

2. Description of the Related Art In an extension type writing instrument, a writing portion of a writing body is easily dried because an end of a shaft cylinder is open.
In particular, in the case of a writing instrument using water-based ink, the tip opening of the barrel is provided with an airtight holding means such as a lid that is opened and closed by movement of the writing body by a feeding operation, and the writing section is inserted into the barrel. It is well known to improve the airtightness of the space around the writing section during immersion. If you describe the structure in detail, the function of the cap to prevent the writing part from drying out,
Replace the opening / closing function of the lid inside the opening at the tip end of the barrel, move the writing body by the feeding mechanism provided on the barrel, and open or close the lid directly or indirectly with the movement It has a structure. For example, there is a structure disclosed in Japanese Utility Model Publication No. 38-18620, which is an earlier application of the present applicant.

[0003] Such an airtight maintaining means functions when the writing main body is housed in a shaft cylinder, and seals a space around the writing portion by closing a lid or the like, and uses saturated vapor due to evaporation of ink. It is designed to enclose the writing section and prevent the writing section from drying out. To this end, it is important to ensure the airtightness of the space surrounding the pen tip, which is the portion that is wet with the ink and whose surface is open to the surrounding air, related to the ink evaporation of the writing portion, It cannot be said that the structure has airtightness retention performance.

[0004] The reason is derived from the structure peculiar to the extension type writing instrument. Because the opening and closing structure of the lid is involved in the movement of the writing body, in a fountain pen, etc., the writing body has directionality between the lid and It is necessary to restrict the writing body from rotating with respect to the lid. For this purpose, engaging means such as a guide projection and a guide groove are provided on the writing main body and the barrel or the inner cylinder so that the writing body can be moved only in the longitudinal direction of the barrel without rotating. Normally, the gap between moving parts is minimized to prevent air convection and the airtightness of the rear is secured to some extent by the labyrinth effect, but in the case of a fountain pen, the movement amount of the writing body in the longitudinal direction of the shaft cylinder Is usually 12mm
Because of the above, a coil spring having a long stroke is often used, and it is difficult to secure the airtightness behind the writing main body due to the influence of the engaging means. As a result, the airtightness of the space around the writing portion is reduced. This is because the property securing is insufficient.

[0005] Usually, the writing implement is provided with a clip for carrying. In the case of a writing-type writing implement that uses water-based ink, the writing section should be held in the direction opposite to the gravity so that the ink does not scatter from the writing section when carrying it. The clip is attached to the position of the outer peripheral surface of the standard shaft cylinder that does not disturb the writing to perform the writing after determining the direction of the Not the best clip mounting position.

[0006]

Therefore, the present inventor has proposed:
In view of these facts in the conventional extended writing instrument,
When the writing section of the writing body was immersed in the barrel, the idea was to provide a writing instrument that could reliably maintain the air-tightness of the space around the writing section and that would not disturb the clip during writing. .

[0007] As a structure in which the clip does not get in the way during writing, there are proposed a structure in which the clip is moved so as to sink into the barrel, a structure in which the clip is movable in the longitudinal direction of the barrel, and various structures. Have been. However, combining such a structure with the structure for maintaining the airtightness of the space around the writing section has a disadvantage in that the structure becomes complicated.

Japanese Patent Publication No. 39-8968 discloses a fountain pen structure in which a writing nib, an ink feed unit and an ink storage tank can be simultaneously rotated with respect to a shaft cylinder. There has been proposed a device in which the writing body can be rotated according to the convenience of each person. This is to remove the rear part of the barrel and rotate the ink reservoir with respect to the front part of the barrel so that the twist angle of the pen tip with respect to the gripping part of the barrel having a non-circular cross section can be adjusted. is there. However, the present invention is, of course, not of the feeding type, and therefore does not show a measure for ensuring airtightness in correlation with the lid, the guide groove, the coil spring, and the feeding mechanism.

The present inventor pays attention to the above invention, and can set the position of the clip at a desired position by rotating the writing main body with respect to the barrel so that the clip does not become an obstacle during writing. We came up with the present invention and came up with the present invention.

[0010] An object of the present invention is to keep the space around the writing portion airtight when the writing portion of the writing body is immersed in the barrel, and to prevent the clip from interfering with the writing operation during writing. Obtain a writing instrument that allows the writing body to rotate in the direction of any position on the circumference of the barrel so that the clip mounting position of the barrel and the relative position of the writing part can be selected at the position with the least amount. With the goal.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a dispensing writing instrument, wherein an inner cylinder is rotatably disposed in a shaft cylinder so as to enclose a writing body. Inside the tip of the body, a lid that opens and closes with the movement of the writing body, and a seal ring that is located behind the lid and at least the writing part is in close contact with the writing body in a ring shape when immersed in the barrel. When the writing part of the writing body is immersed in the barrel, a sealing means for sealing the space around the writing part is fixed, and the writing body is provided on the inner wall of the inner cylinder along the moving direction of the writing body. By forming a slidable projection by engaging with the guide groove and rotating the inner cylindrical body, the writing main body is configured to rotate in conjunction therewith.

Further, in the inner cylindrical body, a front end or a rear end thereof is configured to protrude outward from a front end opening or a rear end opening of the shaft tube.

[0013] Alternatively, in the extension type writing instrument, the ring body is rotatably connected to the leading end or the rear end of the barrel so as to be rotatable with respect to the barrel, and the inner barrel is attached to the barrel so as to include the writing body. It is disposed rotatably, the ring body and the inner cylindrical body are linked by an engagement means, and one end is rotatably connected to the ring body or the inner cylindrical body. A lid body that opens and closes, and a seal ring provided inside the inner cylinder body located at the rear of the lid body, wherein at least the writing portion is in close contact with the writing body in a ring shape when immersed in the shaft cylinder. When the writing unit is immersed in the barrel, a sealing means for sealing the space around the writing unit is fixed, and the writing unit is engaged with a guide groove provided on the inner wall of the inner cylinder along the moving direction of the writing unit. By forming a slidable projection and rotating the ring body Writing body together with the inner cylindrical body is also structured to rotate together.

Further, the sealing means has a structure in which a sealing body having a lid at the front end which opens and closes with movement of the writing main body and a seal ring at the rear end closely contacting the writing main body in a ring shape. I do.

[0015] In the dispensing writing instrument of the present invention, the dispensing mechanism for projecting and holding the writing portion of the writing main body from the opening at the distal end of the barrel and immersing the writing portion into the barrel is provided by:
A knock-type or rotary structure having a known technique is used as it is.

[0016]

[Function] When the writing portion of the writing main body is immersed in the shaft cylinder, the sealing means includes a lid body that opens and closes as the writing main body moves and a seal ring that closely contacts the writing main body in a ring shape. The space around the writing section is sealed.

Further, the inner cylinder is rotatably disposed with respect to the shaft cylinder, and the writing main body and the inner cylinder are connected by engaging means formed respectively, so that the inner cylinder is rotated. Then the writing body will rotate in conjunction with it.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the respective embodiments, the same members and the same portions are indicated by the same reference numerals.

Each embodiment of the present invention will be described as an extended writing implement in the case where the writing implement is a fountain pen, but the present invention is not limited to this.

FIGS. 1 to 3 show a fountain pen in which a writing body 3 in which a writing portion 3 having a metal pen tip 4 is housed in a shaft cylinder 2 is provided. It is.
Behind the writing main body 5, a knocking body 7 having one end protruding outward from a rear end opening 6 of the barrel 2, a rotating cam barrel 8, and a concave groove formed in an inner wall of the barrel 2 are provided. A known feeding mechanism 10 including a fixed cam 9 is provided.

The barrel 2 is composed of a front half 2a and a rear half 2b.
The rear half 2b can be removed.

In the barrel 2, the inner cylinder 12 is rotatable with respect to the barrel 2 so as to enclose the writing main body 5, and falls off from the tip opening 13 on the writing side of the barrel 2. In order to prevent this, the end face abuts on the step portion 14 on the inner wall surface of the barrel 2. 2 facing the inner wall surface of the inner cylindrical body 12
A guide groove 15 is provided at the position along the moving direction of the writing main body from the rear end.

The writing main body 5 is provided with a projection 16 which engages with the guide groove 15 and slides with the movement of the writing main body, and is rotatable in conjunction with the rotation of the inner cylinder 12.
The writing body 5 is urged rearward by a spring 18 having one end abutting against a step 17 on the inner wall surface of the inner cylindrical body 12 and the other end abutting against the projection 16.

At the front end of the barrel 2, a ring body 20 having a rear end portion inside the barrel 2 and having a through hole 19 is provided.
By fitting to the shaft cylinder 2 by the beat 20a formed in
It is rotatably attached to the barrel 2. Further, the rear end thereof is connected to the front end of the inner cylindrical body 12 by engaging means including a projection 21 and a concave groove 22, and by rotating the ring body 20, the inner cylindrical body 12 also rotates in conjunction with the rotation. It is arranged to do.

Inside the distal ends of the ring body 20 and the inner cylindrical body 12, an opening 23 of the ring body 20 is provided at the distal end with a lid spring 24.
The writing body 5 has a lid 25 which is closed and opened by the pen tip 4 when the writing main body 5 moves forward, and is made of a rubber elastic body which is in close contact with the outer peripheral surface of the writing main body 5 in a ring shape at the rear end. A seal 27 having a seal ring 26 is provided. The seal body 27 is fixed to the inner cylinder 12 so as to rotate with respect to the shaft cylinder 2 in conjunction with the inner cylinder 12.

A clip 2 is provided on the outer peripheral surface on the distal end side of the barrel 2.
8 is attached.

To explain the operation by the feeding operation, as shown in FIG. 3, when the writing unit 3 is immersed in the barrel 2,
A space 29 surrounding a portion related to ink evaporation including the pen tip 4
Is sealed by the seal body 27, so that the pen tip 4
Prevent excess ink transpiration from such as.

When the knocking body 7 is pressed, the writing body 5 moves forward by the action of the rotating cam barrel 8 and the fixed cam 9, and the pen tip 4 moves forward while rotating the lid 25 against the lid spring 24. Then, the pen tip 4 is held so as to protrude outward from the ring body 20 (the state of FIG. 1). During this time, the seal ring 26 of the seal body 27 slides on the outer peripheral surface of the writing main body 5.

When the ring body 20 is rotated with respect to the shaft cylinder 2, since the ring body 20 is connected to the ring body 20 by the engagement means, the inner cylinder body 12 also rotates and engages with the guide groove 15 of the inner cylinder body 12. The writing body 5 is also rotated by the projection 16 in a manner that the writing body 5 is driven.
Since the seal body 27 is fixed to the inner cylinder 12, the inner cylinder 1
2, the pen 25 rotates with the relative position of the lid 25 and the pen tip 4 unchanged. The feeding mechanism 10 does not rotate even if the writing main body 5 rotates because the end of the writing main body 5 only collides with the concave portion 30 of the rotary cam barrel 8, and the rear half 2 b of the shaft cylinder 2 of the feeding mechanism 10. The positional relationship with is unchanged.

FIG. 4 shows a second embodiment of the present invention.
Is a fountain pen similar to that of the first embodiment, and the configuration of a draw-out mechanism 10 disposed behind the barrel 2 and the writing body 5 is the same as that of the first embodiment.

In the barrel 2, an inner cylinder 12 ′ whose tip 51 projects outward from the tip opening 13 of the barrel 2 is attached to the barrel 2 so as to include the writing body 5. It is arranged rotatably. The inner cylinder 12 'is inserted into the top opening 13 so that the top 5 does not fall off from the top opening 13 of the barrel 2.
2 is screwed. The lid 25 is fixed to the distal end opening 53 of the distal end 51 of the inner cylinder 12 'in the same manner as in the first embodiment. The inner cylindrical body 12 'slightly away from the rear
A seal ring 54 made of a rubber elastic body is fixedly attached to the outer peripheral surface of the writing main body 5 in a ring shape. The lid 25 and the seal ring 54 rotate with respect to the shaft cylinder 2 in conjunction with the inner cylinder 12 ′. Other structures are the same as those of the first embodiment.

To explain the operation by the feeding operation, as in the case of the first embodiment, when the writing section 3 is immersed in the barrel 2, the portion related to the ink evaporation including the pen tip 4 is removed. Since the surrounding space 29 is sealed by the lid 25, the seal ring 54, and the inner wall surface of the inner cylinder 12 ', excessive ink evaporation from the pen tip 4 or the like is prevented.

When the knock body 7 is pressed, the pen tip 4 projects outward from the distal end 51 of the inner cylinder 12 'and is held in the same manner as in the first embodiment. During this time, the seal ring 54
The outer peripheral surface of the writing main body 5 slides.

When the distal end portion 51 of the inner cylinder 12 'is pinched with a finger and rotated with respect to the barrel 2, the writing body 5 also rotates in a driven manner. As in the first embodiment, the positional relationship between the lid 25 and the pen tip 4 does not change.

In both the first and second embodiments, the joint 11
Although it is different from the front half 2a of the barrel 2, it may be formed integrally by injection molding or the like.

In both the first and second embodiments, when the rear half 2b of the barrel 2 is separated from the front half 2a of the barrel 2, the writing body 5 returns to the storage position and the lid 25
Closes. In this state, the writing main body 5 is ready to be taken out.
Since one end of the guide groove 15 of 2 ′ slightly projects rearward of the shaft cylinder by a joint, this may be rotated with a fingertip or the like to rotate the inner cylindrical bodies 12, 12 ′.

In the first and second embodiments, the following points may be improved. Although the writing main body 5 is shown to be detachable from the inner cylinders 12 and 12 ', the replacement of the spare ink tank (not shown) does not take out the whole writing main body 5 but only the ink tank part. If possible, a structure may be adopted in which the other writing main body 5 is stopped so as not to be detached from the inner cylindrical bodies 12, 12 '. The seal rings 26 and 54 in the sealing means may be structured so as to exhibit a sealing effect only when the writing section 3 is immersed in the barrel 2 without moving the outer peripheral surface of the writing body back and forth. More specifically, the sealing means described in the earlier invention filed on Jan. 24, 1994 by the applicant of the present application (the title of the invention, "Airtight holding structure in a shaft cylinder in an extension type writing instrument with an openable lid"). Can be used. In the seal body 27 of the first embodiment, the lid 25 and the seal ring 26 may be connected by a bellows structure, and the seal ring 26 may be fixed to the outer peripheral surface of the writing body 5.

[0038]

According to the present invention, when the writing portion of the writing body is immersed in the shaft cylinder, the space around the writing portion can be kept airtight and the writing portion can be prevented from being dried. Therefore, there is an advantage that there is no wasteful consumption of ink, and since the ink in the ink groove and the like does not dry and solidify, the writing performance in writing is good.

Further, since the writing main body can be rotated with respect to the barrel, the position of the clip can be set to a position which is least likely to hinder the writing operation with respect to each person's gripping the barrel during writing. Since it can be adjusted, a gripping state suitable for each person can be obtained. At that time, the sealing means for maintaining the airtightness of the space around the writing portion when the writing portion of the writing body is immersed in the shaft cylinder also rotates together with the writing body, so that the airtightness maintenance performance is not affected. . Also, when there is a need to supply ink, etc., and a request to change the position of the writing body occurs at the same time, by rotating either the writing body or the inner cylinder, the inner cylinder or Since the writing body also rotates in conjunction with it, operability is good.

According to the second and third aspects of the present invention, the inner cylinder or the ring body protruding outward from the shaft cylinder is rotated without separating the shaft cylinder regardless of the state of the writing portion. Since the writing body can be freely rotated, the operation is very easy. There is no need to separate the rear part of the barrel to rotate the writing body.

[Brief description of the drawings]

FIG. 1 is a drawing-out writing instrument according to a first embodiment of the present invention,
It is a longitudinal cross-sectional view in the state where the writing part was projected.

FIG. 2 is a perspective view showing a part of a ring body and an inner cylindrical body in FIG. 1;

FIG. 3 is a vertical cross-sectional view of the drawing-out writing instrument in FIG. 1 showing a state in which a writing section is immersed.

FIG. 4 is a drawing-out writing instrument according to a second embodiment of the present invention;
It is a longitudinal cross-sectional view in the state where the writing part was projected.

DESCRIPTION OF SYMBOLS 1, 1 'Retractable writing implement 2 Shaft barrel 3 Writing part 5 Writing body 10 Retracting mechanism 12, 12' Inner cylinder 13 Tip opening 15 Guide groove 16 Projection 20 Ring body 25 Lid 26 Seal ring 29 Space 53 Tip opening 54 Seal ring

Claims (4)

(57) [Claims] 1. A dispensing type writing instrument comprising a writing mechanism for holding a writing portion of a writing body protruding from a distal end opening of a barrel and a writing mechanism for immersing the writing portion into the barrel. The writing body is rotatably disposed in the shaft cylinder so as to include the writing body, and a lid body that opens and closes with the movement of the writing body, and is located at the rear of the lid body, at least inside the tip of the inner cylinder body. When the writing section is immersed in the barrel, the writing section comprises a seal ring that is in close contact with the writing body in a ring shape. When the writing section is immersed in the barrel, sealing means for sealing the space around the writing section is fixed. On the inner wall of the inner cylindrical body, a slidable projection is formed by engaging a guide groove provided along the moving direction of the writing main body, and by rotating the inner cylindrical body, the writing main body is also interlocked. A dispensing writing implement that rotates. 2. The dispensing writing implement according to claim 1, wherein the front end portion or the rear end portion of the inner cylindrical body projects outward from the front end opening portion or the rear end opening portion of the barrel. 3. A dispensing-type writing instrument having a writing mechanism that protrudes and holds a writing portion of a writing main body from a distal end opening of a barrel and has a delivery mechanism that immerses the writing portion into the barrel. At the front end or the rear end of the cylinder, it is rotatably connected to the shaft cylinder, and the inner cylinder is disposed rotatably with respect to the shaft cylinder so as to include the writing body. One end is connected rotatably in conjunction with the engaging means, and a lid provided inside the tip of the ring body or the inner cylinder, which opens and closes with movement of the writing body, and an inner part located behind the lid. A seal ring provided inside the cylindrical body, at least a writing portion of which is in close contact with the writing body in a ring shape when immersed in the shaft cylinder,
When the writing section of the writing body is immersed in the barrel, a sealing means for sealing a space around the writing section is fixed, and the writing body is
By forming a slidable projection on the inner wall of the inner cylinder body by engaging a guide groove provided along the movement direction of the writing body, and rotating the ring body, the writing body also interlocks with the inner cylinder body. A dispensing writing implement characterized by rotating. 4. The sealing means according to claim 1, wherein the sealing means has a lid at the front end which opens and closes as the writing main body moves, and a seal ring at the rear end which closely contacts the writing main body in a ring shape. 4. The dispensing writing implement according to 2 or 3.