JP2006175725A - Liquid type writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid type writing utensil, which can prevent the ink in a liquid tank from leaking outside through a clearance between the liquid tank and a member connecting with the liquid tank and is excellent in productivity. <P>SOLUTION: In this writing utensil equipped with the liquid tank 10, in which liquid for delivering from a writing part 30 is stored, and a connecting member (or a tip mouth 20) closely connected from an axial direction side with the liquid tank 10, an annular projecting part 21a is provided in either one member belonging to the liquid tank 10 and to the connecting member (or the tip mouth 20) so as to axially pressingly contact the annular projecting part 21a with the other member in order to connect both the members with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a writing instrument including a correcting writing instrument and a correcting applicator, wherein the liquid in a liquid tank is discharged from the writing part at the tip to the outside.

Conventionally, this kind of invention is formed by connecting a tapered cylindrical tip member to the open end side of a bottomed cylindrical liquid tank, and at the connection location, the outer peripheral surface of one member and the other There are many writing instruments that seal the inside of the liquid tank by overlapping the inner peripheral surfaces of the members in close contact with each other.
However, according to the said structure, in order to seal the inside of a liquid tank, it was necessary to make the internal peripheral surface or outer peripheral surface of both said members into a dimension with comparatively high roundness. For this reason, the processing cost has increased, and there are problems in productivity such as complicated parts management.

Therefore, as in the invention described in Patent Document 1, the structure is such that the opening at the rear end of the shaft cylinder, which is a liquid tank, is closed with a tail plug, and the annular welding protrusion provided in the tail plug There is one in which the strip is welded to the shaft tube.
According to this prior art, since the welding protrusion is integrated with the shaft tube, ink in the shaft tube can be prevented from leaking from the gap on the tail plug side.

However, according to the latter prior art, there is an improvement in production, such as an increase in the number of manufacturing steps, because an operation of welding the welding protrusion to the shaft cylinder is necessary in the manufacturing process.
Japanese Utility Model Publication No. 3-64782

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the ink in the liquid tank leaks outside through a gap between the liquid tank and a member connected to the liquid tank. The object of the present invention is to provide a liquid-type writing instrument that can prevent the above-described problem and is excellent in productivity.

  In order to solve the above-mentioned problem, a first invention is a writing instrument comprising a liquid tank that stores a liquid to be discharged from a writing unit, and a connection member that is connected to the liquid tank in a sealed manner from the axial direction side. In the liquid tank and the connecting member, an annular protrusion is provided on one of the members, and the annular protrusion is pressed against the other member in the axial direction to connect both members. It is characterized by.

  In the second invention, the other member is provided with a cylindrical portion having an end surface pressed by the annular protrusion, and the one member has an inner peripheral surface and / or an outer periphery of the cylindrical portion. A cylindrical contact portion that is in close contact with the surface over the entire circumference is provided.

  In the third invention, the cylindrical close contact portion is in close contact with the cylindrical portion of the other member from the inner peripheral surface side, and the outer peripheral surface side of the cylindrical portion with respect to the inner cylindrical close contact portion. The outer cylindrical close contact portion is in close contact, and one of the inner cylindrical close contact portion and the outer cylindrical close contact portion is screwed and connected to the cylindrical portion. It is characterized by closeness.

  In the fourth invention, the other member is provided with an annular recess having a depth smaller than the projecting dimension of the annular protrusion, and the annular protrusion is bitten into the annular recess. It is characterized by.

  The fifth invention is characterized in that the annular protrusion of the one member is formed of a material harder than the other member.

In addition, the liquid tank includes a mode in which a shaft cylinder gripped at the time of writing is also used, a mode in which the liquid tank is a separate member and disposed in the shaft cylinder, and the like. .
Specific examples of the connecting member include a front end connected to the front end side of the liquid tank and a tail plug connected to the rear end side of the liquid tank.
The “sealed connection” means a configuration in which the connection portion is sealed so that liquid does not leak outside from the connection portion between the liquid tank and the connection member.

Since the present invention is configured as described above, the following effects can be obtained.
According to the first invention, since the annular protrusion of one member and the end surface of the other member are brought into pressure contact with each other, the sealing property at the connection point between the liquid tank and the connection member is maintained. Unlike the conventional technique in which the outer peripheral surface of one member and the inner peripheral surface of the other member are in close contact with each other, high roundness is not required, and the welding protrusion is welded to the shaft tube. There are few problems such as an increase in the number of manufacturing steps as in other conventional techniques.
Therefore, the ink in the liquid tank (including the correction liquid) can be prevented from leaking outside through a gap between the liquid tank and a member connected to the liquid tank, and the productivity is also excellent. A liquid writing instrument can be provided.

Furthermore, according to 2nd invention, the surrounding wall of a cylinder part expand | swells in the thickness direction by press-contacting by an annular protrusion. Therefore, the cylindrical portion and the cylindrical close contact portion are pressed against each other, and the close contact state is improved.
Therefore, it is possible to more effectively prevent the ink in the liquid tank from leaking outside.

Furthermore, according to the third invention, the inner cylindrical close contact portion is pressed against the inner peripheral surface side of the cylindrical portion that expands the peripheral wall in the thickness direction by being pressed against the annular protrusion, The outer cylindrical contact portion is pressed against the outer peripheral surface side. Therefore, ink leakage can be prevented more effectively.
And since the surrounding wall of a cylinder part expand | swells in the thickness direction, the loosening of the screw of the part screwed and connected can also be prevented.

Furthermore, according to the fourth aspect of the invention, in the manufacturing stage, the annular protrusion of one member is guided to the annular recess of the other member and is aligned, so that the manufacturability is good.
In addition, since the annular protrusion of one member pushes the annular recess of the other member and bites into the tubular portion of the other member, the peripheral wall of the tubular portion is expanded more effectively in the thickness direction. As a result, ink leakage can be prevented more reliably.
In addition, it is preferable to form the annular recess so as to be similar to the projecting end side portion of the annular protrusion, and according to this specific aspect, the annular recess and the annular protrusion can be brought into closer contact with each other, As a result, ink leakage can be more reliably prevented.

In addition, according to the fifth aspect, since the hard annular protrusion of one member can easily bite into the end surface of the other member, the sealing performance at the press contact portion between the annular protrusion and the end surface of the other member is improved. The ink leakage can be more reliably prevented.
Furthermore, according to the aspect provided with the said cylinder part, since the expansion to the thickness direction of the surrounding wall of a cylinder part becomes large, an ink leak can be prevented more effectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present embodiment shows a preferable example in which the liquid writing instrument of the present invention is applied to a correction writing instrument. In addition to the correction writing instrument, the liquid writing instrument of the present invention is applied to a sign pen, a marker pen, a ballpoint pen, and the like. Can also be applied.

  The liquid writing instrument 1 in the illustrated example includes a substantially bottle-shaped liquid tank 10, a front end 20 (connection member) screwed to an opening on the front end side of the liquid tank 10, and a support in the front end 20. And a cap 40 that is detachably attached to the tip 20 so as to cover the writing unit 30, and guides the liquid as the correction liquid from the liquid tank 10 to the writing unit 30. Further, it is configured to discharge from the tip of the writing unit 30 to the outside.

The liquid tank 10 is integrally formed from a synthetic resin material, and is integrally formed from a bottomed cylindrical main body portion 11 and a cylindrical portion 12 having a diameter slightly smaller than the main body portion 11. The front end surface has an annular recess 12a, and the outer peripheral surface of the cylindrical portion 12 on the rear side of the annular recess 12a has a male screw portion 12b.
The annular recess 12a is a groove having a substantially V-shaped cross section, more specifically, a similar groove following a protruding end side portion of an annular protrusion 21a described later, and a depth dimension smaller than the protrusion dimension of the annular protrusion 21a. And is disposed over the entire circumference of the front end surface of the cylindrical portion 12.
The liquid tank 10 having the above-described configuration is filled with white correction ink (correction liquid).

The front opening 20 is a connecting member connected in a sealed manner to the front end of the liquid tank 10 and is integrally formed from a synthetic resin material harder than the liquid tank 10.
The tip 20 has a substantially flat contacted surface 21 that is brought into contact with the front end surface of the liquid tank 10, and the contacted surface 21 is provided on the front end surface of the liquid tank 10. An annular protrusion 21a for press-contact is formed (see FIG. 2A).
The annular protrusion 21a is an annular protrusion having a substantially chevron-shaped cross section, and the protrusion is disposed so as to face the annular recess 12a on the front end surface of the cylindrical portion 12.

Further, an inner cylindrical contact portion 22 that is in close contact with the cylindrical portion 12 of the liquid tank 10 from the inner peripheral surface side is formed on the inner side in the radial direction from the annular protrusion 21 a in the tip 20.
The inner cylindrical close contact portion 22 has an outer diameter slightly larger than the inner diameter of the cylindrical portion 12 in the liquid tank 10 and is press-fitted into the cylindrical portion 12.

Further, an outer cylindrical close-up portion 23 that is in close contact with the cylindrical portion 12 of the liquid tank 10 from the outer peripheral surface side is formed on the outer side in the radial direction from the annular protrusion 21 a in the front end 20.
The outer cylindrical contact portion 23 has a cylindrical shape that covers the cylindrical portion 12 of the liquid tank 10 over substantially the entire length in the axial direction, and the inner peripheral surface thereof is in close contact with the cylindrical portion 12 of the liquid tank 10. A female screw portion 23a to be screwed is formed.

  In addition, a writing portion 30 to be described later is fitted and connected to the inside of the tapered front end portion of the front opening 20.

The writing unit 30 is a so-called ball-point pen tip. The transfer ball 32 is rotatably held inside the front end side of the substantially cylindrical main body 31, and the transfer ball 32 is elastically supported from behind by a spring 33. It is comprised so that it may press, and the front-end part is made to protrude ahead from the front opening 20. FIG.
The writing unit 30 may be configured to guide the correction ink in the liquid tank 10 to the front end portion and discharge an appropriate amount from the front end portion. For example, for a sign pen in which a large number of synthetic resin fibers are bundled Can be replaced with a writing part for marker pens, a writing part for marker pens, a writing part for brush pens, a brush-like writing part, and the like.

  In addition, the cap 40 is fitted over the outer peripheral surface of the front opening 20 so as to cover the substantially entire length in the axial direction of the front opening 20 and the inner cylinder 41 which is in close contact with the tapered front end portion of the front opening 20 The outer cylinder 42 is integrally formed and is detachably attached to the tip 20 (see FIG. 1).

According to the liquid writing instrument 1 configured as described above, when the front end 20 is assembled to the liquid tank 10, when the front end 20 is screwed into the cylindrical portion 12 of the liquid tank 10, first, the annular shape of the front end of the cylindrical portion 12 is formed. The concave portion 12 a comes into contact with the protruding end of the annular protruding portion 21 a of the tip 20.
When the screwing of the tip 20 is continued, the annular recess 12a is pushed and expanded by being pressed by the annular protrusion 21a, and the annular protrusion 21a bites into the annular recess 12a. Then, the cylindrical portion 12 expands its peripheral wall in the thickness direction (the direction of the arrow in FIG. 2B), and the front end surface of the cylindrical portion 12 comes into contact with the contacted surface 21 of the tip 20. .
Therefore, the inner peripheral surface of the cylindrical portion 12 in the liquid tank 10 is in pressure contact with the outer peripheral surface of the inner cylindrical close contact portion 22 in the tip 20, and the sealing performance at this press contact location is improved.

Further, due to the expansion in the thickness direction of the peripheral wall of the cylindrical portion 12, the outer peripheral surface of the cylindrical portion 12 is also pressed against the outer cylindrical close-contact portion 23 in the tip 20. Specifically, the male screw portion 12 b on the outer peripheral surface of the cylindrical portion 12 is pressed against the female screw portion 23 a on the inner peripheral surface of the outer cylindrical close contact portion 23.
For this reason, the sealing performance at the press contact location is improved, and the loosening of the screw at the screw connection location can be prevented.

It is sectional drawing which shows an example of the liquid type writing instrument concerning this invention. In the same liquid writing instrument, (a) shows a state before the annular protrusion is pressed against the annular recess, and (b) shows a state where the annular protrusion is pressed against the annular recess.

Explanation of symbols

1: Liquid writing instrument 10: Liquid tank 12: Tube portion 12a: Annular recess 20: Tip (connecting member)
21a: annular protrusion 30: writing part

Claims (5)

In a writing instrument comprising a liquid tank for storing a liquid to be discharged from a writing unit, and a connection member connected in a sealed manner from the axial direction side to the liquid tank,
One of the liquid tank and the connection member is provided with an annular protrusion, and the annular protrusion is pressed against the other member in the axial direction to connect both members. Liquid writing instrument. The other member is provided with a cylindrical portion having an end surface pressed by the annular protrusion,
2. The liquid writing instrument according to claim 1, wherein the one member is provided with a cylindrical close-contact portion that is in close contact with the inner peripheral surface and / or the outer peripheral surface of the cylindrical portion over the entire periphery. An inner cylindrical contact portion that is in close contact with the cylindrical portion of the other member from the inner peripheral surface side thereof, and an outer cylindrical close contact portion that is in close contact with the cylindrical portion from the outer peripheral surface side thereof; Consisting of
3. One of the inner cylindrical close contact portion and the outer cylindrical close contact portion is in close contact by being screwed to the cylindrical portion. The liquid writing instrument described.   An annular recess having a depth smaller than the projecting dimension of the annular protrusion is provided in the other member, and the annular protrusion is bitten into the annular recess. 3. Liquid writing instrument according to 3.   The liquid writing instrument according to any one of claims 1 to 4, wherein the annular protrusion of the one member is formed of a material harder than the other member.

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