JP2006123433A - Liquid type writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the possibility of leakage of ink from the penpoint side and moreover to dispense with a troublesome pressing operation for supplying the ink to a penpoint. <P>SOLUTION: A first valve device A is composed of a first valve part 41 provided in the outer peripheral surface of a valve member 4 in a frontward urged state and of a first valve seat 51 which can be in close contact with the first valve part 41. A second valve device B is composed of a second valve part 42 provided in the outer peripheral surface of the valve member 4, in front of the first valve part 41, and of a second valve seat 52 which is disposed in front of the first valve seat 51 and with which the second valve part 42 can be in close contact. When a cap 9 is fitted to the penpoint side of a writing implement main body 1, the penpoint 3 is pressed backward by the inner wall of the cap 9 and the valve member 4 is moved backward. Thereby the first valve device A is opened and the second valve device B is closed. When the cap 9 is taken off the penpoint side of the writing implement main body 1, the valve member 4 is moved forward and thereby the first valve device A is closed, while the second valve device B is opened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid writing instrument. More specifically, the present invention relates to a liquid writing instrument that opens a valve device by pressing the pen tip backward and supplies ink to the pen tip.

  In the present invention, "front" refers to the pen tip side of the writing instrument body, refers to the closed side of the cap, and "rear" refers to the ink reservoir side of the writing instrument body, for pen tip insertion in the cap. Refers to the open side.

Conventionally, in this type of liquid writing instrument, Patent Document 1 discloses a pen shaft that can open and close a valve device to supply ink in an ink storage chamber to a pen tip, and a thin portion that is substantially stepped or substantially arched. The structure which consists of the cap which provided the movable part which was made movable via is disclosed.
JP 2002-178865 A

  The conventional liquid writing instrument has a structure in which the movable portion of the cap is pressed to the pen tip side while the cap is attached to the pen tip side, thereby opening the valve device. The conventional liquid writing instrument does not need to press the pen tip against the writing surface when opening the valve device, but it is necessary to consciously perform a pressing operation to open the valve device, The pressing operation is troublesome for the user.

  In addition, the conventional liquid writing instrument has an excessive supply of ink from the ink reservoir to the pen tip when the pressing operation is repeated more than necessary times or when the pressure in the ink reservoir rises. Ink may leak out.

  The present invention solves the above-described conventional problems, and ink leaks from the pen tip side even when the pen tip is moved back and forth more than necessary or when the pressure in the ink reservoir rises. An object of the present invention is to provide a liquid-type writing instrument that has no fear and that does not require a troublesome pressing operation for supplying ink to the pen tip.

  The present invention requires the following.

(Claim 1)
The writing instrument body comprising a writing instrument body provided with a valve device that opens by moving the pen tip backward between the nib and the ink reservoir, and a cap detachable on the pen tip side of the writing instrument body. By attaching the cap to the pen tip side of the pen, the pen tip is moved backward to open the valve device,
The valve device comprises a first valve device and a second valve device disposed in front of the first valve device, and the first valve device is an outer peripheral surface of a valve member in a forward biased state. A first valve portion provided on the first valve portion and a first valve seat that can be brought into close contact with the first valve portion, and the second valve device has a valve member outer circumferential surface in front of the first valve portion. And a second valve seat disposed in front of the first valve seat and capable of closely contacting the second valve portion,
When the cap is mounted on the pen tip side of the writing instrument main body, the pen tip is pressed backward by the inner wall of the cap, and the valve member is moved rearward, whereby the first valve device is opened and the second The valve device is closed,
When the cap is removed from the pen tip side of the writing instrument body, the valve member is moved forward, whereby the first valve device is closed and the second valve device is opened. Liquid writing instrument.

(Claim 2)
On the inner surface of the cap opening, a fitting portion that can be fitted to the pen tip side outer surface of the writing instrument body is formed, and on the inner surface of the cap in front of the fitting portion, a pen tip pressing portion that presses the pen tip backward is formed. The liquid writing instrument according to claim 1, wherein the pen tip pressing portion is fixed so as not to move in the front-rear direction with respect to the fitting portion.

(Claim 3)
The force required to remove the cap forward from the pen tip side of the writing instrument body is set to be larger than the forward biasing force of the valve member in a state where the cap is attached to the pen tip side of the writing instrument body. Liquid writing instrument.

According to the first aspect, even when the rearward movement of the pen tip is repeated more than necessary, or even when the pressure in the ink reservoir rises, there is no possibility that the ink leaks from the pen tip side.

According to the second aspect, a constant amount of ink can be supplied to the pen tip by a normal cap attaching / detaching operation, and a troublesome pressing operation for supplying ink to the pen tip becomes unnecessary.

According to the third aspect, the cap is not removed forward by the forward biasing force of the valve member, and the state where the first valve device is closed and the second valve device is opened is properly maintained.

The best mode for carrying out the present invention will be described.

[1] The present invention relates to a writing instrument body 1 provided with a valve device that opens by moving the pen tip 3 backward between the pen tip 3 and the ink reservoir 22a, and the pen tip 3 of the writing instrument body 1 A liquid-type writing instrument comprising a cap 9 detachably attached to the side, and mounting the cap 9 on the pen-tip 3 side of the writing instrument body 1 to move the pen-tip 3 backward to open the valve device. The valve device includes a first valve device A and a second valve device B disposed in front of the first valve device A, and the first valve device A is in a forward biased state. The first valve portion 41 provided on the outer peripheral surface of the valve member 4 and a first valve seat 51 that can be in close contact with the first valve portion 41, and the second valve device B is the first valve portion B. A second valve portion 42 provided on the outer peripheral surface of the valve member 4 in front of the valve portion 41, and a front side from the first valve seat 51. When the cap 9 is mounted on the pen tip 3 side of the writing instrument body 1, the pen tip 3 is moved backward by the inner wall of the cap 9. When the valve member 4 is pressed and moved backward, the first valve device A is opened and the second valve device B is closed, and the cap 9 is removed from the pen tip 3 side of the writing instrument body 1. When it is removed, the valve member 4 is moved forward, whereby the first valve device A is closed and the second valve device B is opened (Claim 1).

  In the liquid writing instrument (Claim 1), when the cap 9 is attached to the pen tip 3 side of the writing instrument body 1, the valve member 4 is moved backward, whereby the first valve device A is opened and the second The valve device B is closed. When the liquid writing instrument to which the cap 9 is attached is turned downward, the first valve device A is opened, so that the first valve device A and the second valve device B (that is, Ink is supplied from the ink reservoir 22a to the ink circulation space 10 in front of the first valve device A and behind the second valve device B). At this time, when the second valve device B is closed, the ink supply from the ink circulation space 10 to the pen tip 3 side is blocked.

  Then, when the cap 9 is removed from the pen tip 3 side of the writing instrument body 1, the first valve device A is closed and the second valve device B is opened. When the writing instrument main body 1 is in the pen tip downward state, a certain amount of ink in the ink circulation space 10 is supplied to the pen tip 3 side by the opening of the second valve device B, and writing becomes possible. . By closing the first valve device A, the ink supply from the ink reservoir 22a to the ink circulation space 10 side is blocked. That is, the first valve device A and the second valve device B do not open at the same time, and the pen tip 3 and the ink reservoir 22a communicate with each other via the ink circulation space 10 and do not communicate directly.

  Thereby, even when the rearward movement of the pen tip 3 is repeated more than necessary, or even when the pressure in the ink reservoir 22a is increased, there is no possibility that the ink leaks outside from the pen tip 3 side.

[2] In the liquid writing instrument (Claim 1), a fitting portion 93a is formed on the inner surface of the opening of the cap 9 so that the fitting portion 93a can be fitted to the outer surface of the writing tool body 1 on the pen nib 3 side. A pen tip pressing portion 91 that presses the pen tip 3 backward is formed on the inner surface of the front cap 9, and the pen tip pressing portion 91 is fixed so as not to move in the front-rear direction with respect to the fitting portion 93 a. Claim 2) is preferred.

  In the liquid writing instrument (Claim 2), when the cap 9 is mounted on the pen tip 3 side, the pen tip 3 is pressed rearward by the rearward movement of the cap 9, and the valve member 4 is moved rearward. The valve device A is opened and the second valve device B is closed, and ink is supplied from the ink reservoir 22a to the ink circulation space 10 between the first valve device A and the second valve device B. Then, by removing the cap 9, the valve member 4 is moved forward, the first valve device A is closed and the second valve device B is opened. It is supplied to the tip 3 and can be written.

  That is, the liquid writing instrument (Claim 2) can supply a predetermined amount of ink to the pen tip 3 by a normal operation of attaching and detaching the cap 9, and a troublesome pressing operation for supplying ink to the pen tip 3 (That is, a conscious pressing operation) becomes unnecessary.

[3] In the liquid writing instrument (claim 1 or 2), the force required to remove the cap 9 forward from the pen tip 3 side of the writing tool body 1 is attached to the pen tip 3 side of the writing tool body 1 It is preferable that the valve member 4 is set to be larger than the forward biasing force in the state (Claim 3).

  Thereby, the cap 9 is not removed forward by the urging force of the valve member 4 forward, and the state in which the first valve device A is closed and the second valve device B is opened is properly maintained. . Examples of the fitting portion 93a include a climbing fitting portion, a screw fitting portion, and a press-fitting fitting portion.

  1 and 2 show an embodiment of the present invention.

  The liquid writing instrument of the present embodiment includes a writing instrument body 1 and a cap 9 that is detachable on the pen tip 3 side of the writing instrument body 1.

Writing instrument body The writing instrument body 1 includes a shaft cylinder 2 having an ink reservoir 22a therein, a pen tip 3 attached to the tip of the shaft cylinder 2 so as to be movable in the axial direction, and the pen tip 3 and ink. It consists of a valve device which is arranged between the reservoir 22a and opens and closes by moving the pen tip 3 back and forth.

-Shaft tube The shaft tube 2 includes a front shaft 21 and a rear shaft 22. The front shaft 21 is fixed to the front end opening of the rear shaft 22. The tip shaft 21 has a pen tip sliding hole 21a penetratingly provided at a tip portion thereof to hold the pen tip 3 slidable in the axial direction. An air groove is provided in the pen tip sliding hole 21a in the axial direction. The rear shaft 22 is a bottomed cylindrical body having an open front end and a closed rear end. An outward projection 21b (fitting portion) on which the inward projection 93a (fitting portion) on the inner surface of the cap 9 can get over and fit is formed on the outer surface of the front shaft 21.

Pen nib The pen nib 3 includes a pen body 31 made of a fiber resin processed body or a porous body, and a pen tip holding cylinder 32 fixed to the outer peripheral surface of the pen body 31.

Ink absorber An annular ink absorber 8 (for example, a porous body such as a sponge) is disposed on the front surface of the second valve device B (second valve seat 52). In the cap mounted state, the outer peripheral surface of the rear end portion of the nib 3 is positioned on the inner peripheral surface of the ink absorber 8, and the outer surface of the second valve portion 42 and the nib 3 are removed in the state where the cap 9 is removed. The outer peripheral surface of the rear end portion is located on the inner peripheral surface of the ink absorber 8. The ink absorber 8 temporarily retains ink from the ink circulation space 10 and prevents excessive supply of ink to the pen tip 3.

-Valve apparatus The said valve apparatus consists of the 1st valve apparatus A and the 2nd valve apparatus B arrange | positioned ahead of this 1st valve apparatus A. The first valve device A includes a first valve portion 41 and a first valve seat 51. The second valve device B includes a second valve portion 42 and a second valve seat 52. An ink circulation space 10 is formed between the first valve device A and the second valve device B (that is, in front of the first valve device A and behind the second valve device B).

  Specifically, the valve device (the first valve device A and the second valve device B) includes a valve member 4, a valve seat member 5, a spring seat member 6, and a spring 7.

-Valve member The said valve member 4 is a rod-shaped body arrange | positioned at the axial center of a valve apparatus. The valve member 4 has, on its outer surface, a spherical first valve portion 41 projecting in an annular shape, and a right columnar second valve portion 42 projecting annularly in front of the first valve portion 41. Are integrally formed. A pen tip mounting hole is formed in the front end surface of the valve member 4, and the rear end portion of the pen tip 3 is press-fitted and fixed to the pen tip mounting hole. The tip of the spring 7 is locked to the rear surface of the first valve portion 41 of the valve member 4. The valve member 4 is always urged forward by a spring 7.

-Valve seat member The said valve seat member 5 is a cylindrical body arrange | positioned on the outer periphery of the said valve member 4. As shown in FIG. The valve seat member 5 has, on its inner surface, a first valve seat 51 formed of an annular inclined surface that allows the first valve portion 41 to be in close contact with the first valve seat 51 and a first valve seat that protrudes annularly in front of the first valve seat 51. Two valve seats 52 are integrally formed. The outer surface of the valve seat member 5 is press-fitted and fixed to the inner surface of the spring seat member 6. The axial distance between the first valve seat 51 and the second valve seat 52 is shorter than the axial distance between the first valve portion 41 and the second valve portion 42. Is set. That is, the first valve seat 51 and the second valve seat 52 are disposed between the first valve portion 41 and the second valve portion 42.

Spring seat member The spring seat member 6 is a cylindrical body whose inner surface is press-fitted and fixed to the outer surface of the valve seat member 5 and whose outer surface is press-fitted and fixed to the inner surface of the opening of the rear shaft 22. The spring seat member 6 has a communication hole 61 extending through the side wall and the bottom wall. The ink in the ink reservoir 22 a is supplied into the spring seat member 6 through the communication hole 61. The communication hole 61 in the bottom wall penetrates the rear end portion of the valve member 4. The bottom wall locks the rear end of the spring 7.

  The spring 7 is a compression coil spring. The front end of the spring 7 is locked to the rear surface of the first valve portion 41 of the valve member 4, and the rear end is locked to the bottom wall of the spring seat member 6. The valve member 4 is biased forward by the spring 7.

Cap The cap 9 is formed of a bottomed cylindrical body whose front end is closed and rear end is opened. On the inner surface of the bottom wall of the cap 9, a cylindrical pen tip pressing portion 91 protruding rearward is integrally formed. Further, an inner cylindrical portion 92 surrounding the outer peripheral surface of the pen tip pressing portion 91 is integrally formed on the bottom wall of the cap 9 concentrically with the pen tip pressing portion 91. An inner surface of the inner cylindrical portion 92 is formed with an annular protrusion 92a that is in close contact with the outer surface of the tip shaft 21 and seals the pen tip 3. Further, an outer cylinder portion 93 surrounding the outer peripheral surface of the inner cylinder portion 92 is integrally formed on the bottom wall of the cap 9 concentrically with the inner cylinder portion 92. On the inner surface of the outer cylindrical portion 93, an outward projection 21b (fitting portion) on the outer surface of the front shaft 21 is integrally formed with an inward projection 93a (fitting portion) capable of getting over and fitting.

  The force required to remove the cap 9 forward (cap removal force) from the cap mounting state in which the outward projection 21b on the outer surface of the front shaft 21 and the inward projection 93a on the inner surface of the outer cylinder portion 93 are fitted over is fitted to the valve member by the spring 7. It is set to be larger than the force for urging 4 forward. Thereby, the cap 9 is not easily detached by the forward biasing force of the valve member 4, and the cap mounting state is properly maintained.

  The operation of this embodiment will be described.

・ Cap installed (Fig. 1)
In the process of mounting the cap 9 on the pen tip 3 side of the writing instrument body 1, the pen tip pressing portion 91 on the inner surface of the cap 9 abuts on the tip of the pen tip holding cylinder 32, and the valve member 4 is moved backward together with the pen tip 3. . Thereby, in a state where the cap 9 is mounted on the pen tip 3 side of the writing instrument body 1, the first valve unit 41 is separated from the first valve seat 51 and the first valve device A is opened. The second valve device B is closed by the second valve portion 42 being in close contact with the second valve seat 52. At this time, the ink is supplied from the ink reservoir 22a through the first valve device A to the ink circulation space 10, but the ink supply to the pen tip 3 is blocked. In the present embodiment, since the pen tip pressing portion 91 is in contact with the pen tip holding cylinder 32 and the pen tip pressing portion 91 and the pen body 31 are not in direct contact with each other, the pen body 31 can be prevented from being deformed or damaged. .

・ With the cap removed (Figure 2)
Next, when the cap 9 is removed from the pen tip 3 side of the writing instrument body 1, the contact state between the pen tip pressing portion 91 on the inner surface of the cap 9 and the tip of the pen tip holding cylinder 32 is released, and the valve member 4 together with the pen tip 3 is released. Is moved forward. As a result, the first valve unit 41 is brought into close contact with the first valve seat 51 and the first valve device A is closed. At the same time, the second valve unit 42 is separated from the second valve seat 52 and is Two valve devices B are opened. At this time, ink is supplied from the ink circulation space 10 to the pen tip 3 via the ink absorber 8, but ink supply from the ink reservoir 22a to the ink circulation space 10 is blocked.

It is a longitudinal cross-sectional view which shows the cap mounting state of the Example of this invention. It is a longitudinal cross-sectional view which shows the state which removed the cap of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument main body 2 Shaft cylinder 21 Lead axis 21a Pen tip sliding hole 21b Outward protrusion (fitting part)
22 Rear shaft 22a Ink reservoir 3 Pen tip 31 Pen body 32 Pen tip holding cylinder 4 Valve member 41 First valve portion 42 Second valve portion 5 Valve seat member 51 First valve seat 52 Second valve seat 6 Spring seat member 61 Communication hole 7 Spring 8 Ink absorber 9 Cap 91 Pen tip pressing part 92 Inner cylinder part 92a Annular projection 93 Outer cylinder part 93a Inward projection (fitting part)
10 Ink distribution space A First valve device B Second valve device

Claims (3)

The writing instrument body comprising a writing instrument body provided with a valve device that opens by moving the pen tip backward between the nib and the ink reservoir, and a cap detachable on the pen tip side of the writing instrument body. By attaching the cap to the pen tip side of the pen, the pen tip is moved backward to open the valve device,
The valve device comprises a first valve device and a second valve device disposed in front of the first valve device, and the first valve device is an outer peripheral surface of a valve member in a forward biased state. A first valve portion provided on the first valve portion and a first valve seat that can be brought into close contact with the first valve portion, and the second valve device has a valve member outer circumferential surface in front of the first valve portion. And a second valve seat disposed in front of the first valve seat and capable of closely contacting the second valve portion,
When the cap is mounted on the pen tip side of the writing instrument main body, the pen tip is pressed backward by the inner wall of the cap, and the valve member is moved rearward, whereby the first valve device is opened and the second The valve device is closed,
When the cap is removed from the pen tip side of the writing instrument body, the first valve device is closed and the second valve device is opened by moving the valve member forward. Liquid writing instrument. On the inner surface of the cap opening, a fitting portion that can be fitted to the pen tip side outer surface of the writing instrument body is formed, and on the inner surface of the cap in front of the fitting portion, a pen tip pressing portion that presses the pen tip backward is formed. The liquid writing instrument according to claim 1, wherein the pen tip pressing portion is fixed so as not to move in the front-rear direction with respect to the fitting portion. The force required to remove the cap forward from the pen tip side of the writing instrument body is set to be larger than the forward biasing force of the valve member in a state where the cap is attached to the pen tip side of the writing instrument body. Liquid writing instrument.

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