JPH075780U - Writing instrument - Google Patents

Abstract

(57) [Summary] [Structure] By storing ink in a raw ink state in the rear inner hole of the barrel 1 having a tail plug 10 fixed to the rear end opening 3, the rear portion of the barrel 1 is directly used as an ink tank 9. Writing instrument used. Here, the tail plug 10 has a bottomed cylindrical shape, and the tail plug 1
The inner hole portion of 0 is also a part of the ink tank 9. Further, the front end of the tail plug 10 is uneven in the circumferential direction by the groove-shaped recess 13, and the front end portion is fitted into the rear end opening 3 of the barrel 1. [Effect] A large amount of ink can be stored even with a combination of short-shaped parts, the ink can move smoothly in the ink tank, and ink can be quickly filled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a writing instrument in which ink in a raw ink state is stored in a rear inner hole of a shaft cylinder to directly use the rear part of the shaft cylinder as an ink tank.

[0002]

[Prior art]

 The writing instrument of the above-mentioned type is a kind of so-called raw ink writing instrument, and there are two types, that is, a barrel having a bottomed barrel and a separate tail plug fixed to a barrel having a rear end opening. . The latter is the present invention.

[0003]

[Problems to be solved by the device]

 The barrel is generally an injection-molded product of synthetic resin, and if the barrel is made longer to accommodate a large amount of ink, the shape instability such as warpage will increase. In this respect, since a separate tail plug is used, it is possible to use this tail plug as a part of the ink tank. The tail plug is cylindrical with a bottom, and ink is also stored in the inner hole. If desired, the advantage that the portion of the tail plug projecting from the rear end of the tail end is effectively used for displaying the type of pen tip, handwriting width, ink color, etc.

However, in practice, when the bottomed tubular tail plug is fixed to the rear end opening of the barrel, the movement of the ink may not be smooth. For example, when filling the ink, the ink may not smoothly enter the inner hole of the tail plug. In addition, the ink in the inner hole of the tail plug may not be readily supplied to the front during use. That is, the ink does not smoothly replace air. This is because the inner wall surface of the ink tank is not continuous in a circular shape at the connecting portion of these two members. For example, when a small-diameter tail plug is fitted in a large-diameter barrel, the ink tank has a step portion between the small-diameter rear portion and the large-diameter front portion. In addition, even if the design dimensions are the same, inconsistency actually occurs, and the roundness of the edge portion of the molded product may give an annular recess to the inner wall surface of the ink tank.

[0005]

[Means for Solving the Problems]

 The present invention relates to a writing instrument in which the rear portion of a barrel is directly used as an ink tank by accommodating an ink in a raw ink state in the rear inner hole of the barrel having a tail plug fixed to the rear end opening. Is used as a cylinder with a bottom, and the inner hole of this tail plug is also used as a part of the ink tank.Here, the tail plug has a front end that becomes uneven in the circumferential direction, and this front end part is The gist is a writing instrument that is fitted in the rear end opening of the cylinder.

[0006]

【Example】

 An example will be described with reference to the attached FIG. The substantially straight cylindrical barrel 1 includes a front end opening 2, a rear end opening 3, an annular protrusion 4 in the middle of the inner hole, and an appropriate number of parts extending behind the annular protrusion 4. It has ribs 5. It is preferable that the ink has transparency such that the amount of ink can be discriminated.

From the front opening 2 of the shaft cylinder 1, a pen tip 7 is inserted into a temporary ink reservoir member 6 and an elastic ring 8 is fitted, and an integrated product is fixed in advance by press fitting or the like. Here, the elastic ring 8 is in contact with the annular protruding portion 4 of the shaft cylinder 1, and the rear inner hole of the shaft cylinder 1 partitioned by the elastic ring 8 stores ink in a raw ink state. Has become. Although the nib 7 is made of a fiber bundle, it may have a proper structure such as a small tube nib or a ball nib. Further, the elastic ring 8 can be omitted, for example, when the temporary ink reservoir member 6 is made of a material exhibiting sufficient hermeticity.

On the other hand, from the rear end opening 3 of the shaft cylinder 1, a bottomed cylindrical tail plug 10 is fixed in a protruding state. If liquid tightness can be secured, adhesion or the like may be used, but it is easy and reliable to attach by ultrasonic welding, and the tail plug 10 in the figure also rattles when it is fitted into the barrel 1 for ultrasonic welding. It has an appropriate number of protrusions 11 for suppressing the occurrence of.

The inner hole of the tail plug 10 is also a part of the ink tank 9, and the inner wall has an appropriate number of inner ribs 12. The inner ribs 5 of the barrel 1 and the inner ribs 12 of the tail plug 10 are for smoothing the movement of the ink in the ink tank 9. However, the quicker the ink transfer is, the better for quick ink filling. Further, even if the inner ribs 5 and the inner ribs 12 are provided on the shaft cylinder 1 and the tail plug 10 as shown in the drawing, these ribs form the shaft cylinder 1 and the tail plug 10 on the inner wall surface of the ink tank 9. It is not always located at the connection. In fact, the illustrated inner rib 5 is close to the tip of the tail plug 10, but is not aligned. For this reason, the replaceability of ink and air is often impaired at the connection portion.

Therefore, circumferential projections and depressions are provided on the front end of the tail plug 10. The front end of the tail plug 10 is not flat so that the ink in the ink tank 9 can be easily replaced with air, and the one shown in the figure is a groove provided in front of each inner rib 12. However, it is also possible to provide a protrusion projecting forward.

[0011]

[Effect of device]

 The writing instrument of the present invention is a writing instrument in which the rear portion of the barrel is directly used as an ink tank by storing ink in a raw ink state in the rear inner hole of the barrel having a tail plug fixed to the rear end opening. The tail plug has a bottomed cylindrical shape, and the inner hole portion of the tail plug is also used as a part of the ink tank. Here, the tail plug has a front end that is uneven in the circumferential direction, and the front end portion is Since it is fitted inside the rear end opening of the shaft cylinder, the shape of the preparatory part can be shortened so that a large amount of ink can be stored and the movement of the ink in the ink tank is stable. It is also smooth and ink filling can be done quickly.

[Brief description of drawings]

FIG. 1 is a vertical sectional view for explaining an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

[Explanation of Codes] 1 Shaft cylinder 2 Front end opening 3 Rear end opening 4 Annular protrusion 5 Inner rib 6 Temporary ink reservoir member 7 Nib 8 Elastic ring 9 Ink tank 10 Tail plug 11 Protrusion 12 Inner rib 13 Groove shape Recess

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B43K 7/02 7/10 8/04

Claims (1)

[Scope of utility model registration request] 1. A writing instrument in which a rear portion of a barrel is directly used as an ink tank by storing ink in a raw ink state in a rear inner hole of a barrel having a tail plug fixed to a rear end opening. As a bottomed cylinder, the inner hole of this tail plug is also used as a part of the ink tank, where the tail plug has a front end that is uneven in the circumferential direction, and this front end part is A writing instrument that fits inside the opening at the rear end of the cylinder.