JP2007313689A - Ink tank replacing type writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink tank replacing type writing implement which enables visual confirmation of the color and the residual amount of ink in an ink tank and also preventing the ink tank from disconnecting from a connecting portion with the main body of the writing implement caused by an impact of dropping, contact in writing, or others. <P>SOLUTION: The main body 2 of the writing implement is composed of a shaft tube 5 equipped with a pen point 3 at the front end and of a bottomed tubular tail stopper 7 which is fitted so as to be removable in the rear end opening part of the shaft tube 5 and has an opened front end and a closed rear end. The front end part of the ink tank 8 is inserted and fitted inside the shaft tube 5. The rear end part of the ink tank 8 is made to project backward from the rear end opening part of the shaft tube 5. The rear end part of the ink tank 8 is stored inside the tail stopper 7. The ink tank 8 and the tail stopper 7 are formed of transparent materials. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ink tank exchangeable writing instrument.

Conventionally, in this type of writing instrument, Patent Document 1 discloses that an ink tank made of a material having transparency so as to enable appearance of ink accommodated therein, for the purpose of displaying the ink color and the remaining amount of ink outside, In a refill exchangeable writing instrument in which a refill comprising at least a refill that is attachable to and detachable from the writing instrument body is attached to the writing instrument body, the writing instrument body forms an open hole in a rear part thereof, and the ink tank is inserted through the open hole. A refill exchange-type writing instrument that is projected is disclosed.

Japanese Utility Model Publication No. 6-86975

In the writing instrument of Patent Document 1, since the ink tank protrudes rearward from the writing instrument main body, the ink tank is separated from the writing instrument main body by impact such as dropping or contact between the rear end of the ink tank and the hand during writing. This causes the ink in the ink tank to leak to the outside.

In addition, when the writing instrument of Patent Document 1 is attached to the rear part of the writing instrument body when the cap is removed from the pen tip side during writing, the ink tank is covered with the cap and the ink tank protruding rearward from the writing instrument body is fully visible. It may not be possible.

The present invention solves the above-mentioned conventional problems, and can visually recognize the ink color and the remaining amount of ink in the ink tank, and the ink tank is connected to the writing instrument body due to a drop impact or a contact during writing. It is intended to provide an ink tank exchangeable writing instrument that can prevent the ink color from being removed from the ink tank and can visually check the ink color and the remaining amount of ink in the ink tank even when a cap is attached to the rear part of the writing instrument. In the present invention, “front” refers to the pen tip side, and “rear” refers to the ink tank side.

(Configuration 1)
The present invention is an ink tank exchangeable writing instrument in which an ink tank 8 is exchangeably housed inside a writing instrument body 2, wherein the writing instrument body 2 includes a shaft cylinder 5 having a pen tip 3 at a front end, and the shaft cylinder. 5 includes a bottomed tubular tail plug 7 which is detachably attached to the rear end opening of the 5 and has a front end opened and the rear end closed. The front end of the ink tank 8 is inserted into the shaft cylinder 5. The rear end of the ink tank 8 protrudes rearward from the rear end opening of the shaft cylinder 5, and the rear end of the ink tank 8 is accommodated inside the tail plug 7. The ink tank 8 and the tail plug 7 is made of a transparent material (Configuration 1).

In the ink tank replaceable writing instrument 1 having the above-described configuration 1, since the ink tank 8 and the tail plug 7 are made of a transparent material, the ink inside the ink tank 8 can be visually recognized through the tail plug 7 and the ink tank 8, and the ink color and ink You can check the remaining amount visually. Further, in the ink tank replaceable writing instrument 1 having the above-described configuration 1, the ink tank 8 protrudes from the rear end of the writing instrument body 2 when writing is used in a state where the tail plug 7 is attached to the rear end opening of the shaft tube 5. Since it is not a structure, it is possible to prevent the ink tank 8 from coming off from the joint with the writing instrument body 2 due to a drop impact or contact with the ink tank 8 during writing. As a result, the ink in the ink tank 8 can be removed. Leakage to the outside can be avoided.

(Configuration 2)
In the ink tank replaceable writing instrument 1 having the above-described configuration 1, the front end of the tail plug 7 is provided with a shaft tube mounting portion 71 detachably attached to the rear end opening of the shaft tube 5, and the rear end of the tail plug 7 is provided. A cap attaching portion 73 to which the cap 9 removed from the pen tip 3 side can be attached is provided, and the ink in the ink tank 8 is externally provided between the shaft tube attaching portion 71 and the cap attaching portion 73 of the tail plug 7. It is preferable to provide the ink visual recognition part 72 which can be visually recognized (Configuration 2).

The ink tank replaceable writing instrument 1 having the above configuration 2 can visually recognize the ink in the ink tank 8 from the outside through the ink visualizing part 72 even when the cap 9 is attached to the tail plug 7 at the time of writing, and the ink color in the ink tank 8 And the remaining amount of ink can be confirmed visually.

(Configuration 3)
In the ink tank replaceable writing instrument 1 of the configuration 2, a shaft tube mounting portion 71 made of a male screw portion is provided on the outer peripheral surface of the front portion of the tail plug 7 so as to be detachably attached to the rear end opening of the shaft tube 5. A cap mounting portion 73 to which the cap 9 removed from the pen tip 3 side can be mounted on the outer peripheral surface of the rear portion of the tail plug 7 is provided between the shaft mounting portion 71 and the cap mounting portion 73 of the tail plug 7. An ink visualizing part 72 that makes the ink in the ink tank 8 visible from the outside is provided, and the rear end of the shaft cylinder 5 is provided on the outer peripheral surface of the tail plug 7 between the shaft cylinder mounting part 71 and the ink visualizing part 72. And a rearward stepped portion 76 capable of contacting the opening end of the cap 9 on the outer peripheral surface of the tail plug 7 between the ink visual recognition portion 72 and the cap mounting portion 73. (Configuration 3) is preferable.

The ink tank replaceable writing instrument 1 having the above-described configuration 3 can visually recognize the ink in the ink tank 8 from the outside through the ink visualizing portion 72 when the cap 9 is attached to the cap mounting portion 73 of the tail plug 7 at the time of writing. The ink color and remaining ink can be visually confirmed

(Configuration 4)
In the configuration 2 or 3 ink tank replaceable writing instrument 1, the rear end of the ink tank 8 can contact the inner surface of the rear end wall of the tail plug 7 or the inner peripheral surface of the cap mounting portion 73 of the tail plug 7. It is preferable that the wall portion 74 is formed (Configuration 4).

In the ink tank replaceable writing instrument 1 of the configuration 4, the rear end portion of the ink tank 8 can be set to have a large protruding amount so as to protrude rearward from the rear end of the shaft cylinder 5, and the front end of the ink visual recognition portion 72 of the tail plug 7 is rear end. In the area up to this point, the ink color and the remaining ink amount in the ink tank 8 can be visually confirmed.

(Configuration 5)
In the ink tank replaceable writing instrument 1 having the configuration 2 or 3, a contact wall portion 74 with which the rear end of the ink tank 8 can contact is formed on the inner peripheral surface of the side wall of the tail plug 7, and the contact wall portion It is preferable that a cap attaching portion 73 is provided on the outer peripheral surface of the tail plug 7 at the rear of 74 (Configuration 5).

In the ink tank replaceable writing instrument 1 having the configuration 5, the cap tank 73 is provided behind the abutting wall 74, so that the ink tank 8 is the cap 9 when the cap 9 is mounted on the outer surface of the tail plug 7. The covering of the ink tank 8 can be avoided, and the ink color and the remaining amount of ink in the ink tank 8 can be confirmed more reliably.

(Configuration 6)
In the above configurations 2 to 5, a rolling prevention protrusion 77 is provided in the ink visual recognition part 72 on the outer peripheral surface of the tail plug 7, and the radial top portion of the rolling prevention protrusion 77 is rearward from the outer peripheral surface of the shaft tube 5. It is preferable to be located radially outward from the extended line (Configuration 6).

In the ink tank replaceable writing instrument 1 having the configuration 6, even when the writing instrument body 2 is placed on a plane such as a desk, the rolling prevention protrusion 77 prevents the rolling on the plane. The rolling prevention protrusion 77 is preferably provided at the front end portion of the ink visual recognition portion 72 in terms of improving the ink visibility in the ink visual recognition portion 72.

According to the first aspect of the present invention, the ink color and the remaining amount of ink in the ink tank can be visually recognized, and the ink tank can be prevented from being detached from the joint portion with the writing instrument body due to a drop impact or a contact during writing.

According to the second aspect of the present invention, even if the cap is attached to the tail plug at the time of writing, the ink color and the remaining amount of ink in the ink tank can be reliably recognized.

According to the third aspect of the present invention, even when the cap is attached to the tail plug at the time of writing, the ink color and the remaining amount of ink in the ink tank can be reliably recognized.

According to the fourth aspect of the present invention, the ink color and the remaining ink amount in the ink tank can be visually recognized in the region from the front end to the rear end of the ink viewing portion of the tail plug.

According to the fifth aspect of the present invention, the ink tank can be prevented from being covered with the cap when the cap is attached to the outer surface of the tail plug, and the visual confirmation of the ink color and the remaining amount of ink in the ink tank is further ensured. .

According to the sixth aspect of the present invention, even if the writing instrument body is placed on a plane such as a desk, it can be prevented from rolling on the plane.

(First embodiment)
An ink tank exchangeable writing instrument 1 according to a first embodiment of the present invention is shown in FIGS. The ink tank replaceable writing instrument 1 in the form of this example includes a pen tip 3, an ink occlusion body 4 connected to the rear end of the nib 3, an intermediate member 6 disposed behind the ink occlusion body 4, An ink tank 8 disposed behind the intermediate member 6, and a shaft that holds the pen tip 3 at the front end and accommodates the ink storage body 4, the intermediate member 6, and the front portion of the ink tank 8 inside. A cylinder 5, a tail plug 7 that is detachably screwed into the rear end opening of the shaft cylinder 5, and a pen tip 3 side outer surface of the shaft cylinder 5 and a rear end outer surface of the tail plug 7 are detachably mounted. And a cap 9. In the present embodiment, the writing instrument body 2 includes a shaft cylinder 5 and a tail plug 7, and the ink tank 8 is accommodated inside the writing instrument body 2 in a replaceable manner.

Pen nib The nib 3 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The front end of the nib 3 is ground like a bullet. The outer peripheral surface of the rear end portion of the nib 3 is chamfered in a tapered shape.

Ink occlusion body The ink occlusion body 4 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The rear end of the pen tip 3 is inserted into the axial center of the front end surface of the ink storage body 4, and the rear end of the pen tip 3 is positioned in front of the ink storage body 4. In the present invention, instead of providing the ink occlusion body 4, comb-like ink that temporarily holds overflow ink corresponding to an increase in the internal pressure of the ink tank 8 between the nib 3 and the ink tank 8. A retaining member may be provided.

The shaft cylinder 5 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). A pen tip 3 outer peripheral surface is held at a tapered front end portion of the shaft tube 5, and a female screw portion 51 is formed on a rear end opening inner peripheral surface of the shaft tube 5.

Intermediate member The intermediate member 6 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a partition wall 61 that partitions the ink occluding body 4 and the ink tank 8, and a plurality of intermediate members that protrude forward from the front surface of the partition wall 61 and are pierced and connected to the inside of the ink occluding body 4 (specifically 2) communicating pipes 62, a connecting pipe 63 projecting rearward from the rear surface of the partition wall 61 and inserted into the front end opening of the ink tank 8, and projecting rearward from the rear surface of the partition wall 61 and a shaft. And an attachment tube portion 64 fixed to the inner surface of the tube 5 (inner surface of the main body). The connecting pipe 63 is integrally formed with a protruding piece 63a for pressing one side of the plug 81. On the front surface of the partition wall 61, a regulating wall portion 61a made of a plate-like rib is integrally formed. The restriction wall portion 61 a is brought into contact with the rear end surface of the ink occlusion body 4.

Ink tank The ink tank 8 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a transparent synthetic resin (for example, polypropylene). Ink is directly stored in the ink tank 8. The ink stored in the ink tank 8 may be either water-based ink or oil-based ink.

The outer surface of the connecting pipe 63 of the intermediate member 6 is detachably fitted to the inner surface of the front end opening of the ink tank 8. When ink in the ink tank 8 is consumed and writing becomes impossible, the ink tank 8 is removed from the connection pipe 63 and the connection pipe 63 is inserted into the front end opening of a new ink tank 8 filled with ink. To do. Thereby, writing becomes possible again. A front end opening of the new ink tank 8 is closed by a plug 81. When the connecting pipe 63 is inserted into the front end opening of the ink tank 8, the protruding piece 63a of the connecting pipe 63 presses the plug 81 backward, removes the plug 81, and the front end opening of the ink tank 8 opens. It is plugged.

-Tail plug The tail plug 7 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding of a transparent synthetic resin (for example, polypropylene).

A shaft tube mounting portion 71 formed of a male screw portion is formed on the outer peripheral surface of the front portion of the tail plug 7, and the shaft tube mounting portion 71 can be attached to and detached from the female screw portion 51 on the inner peripheral surface of the rear end opening of the shaft tube 5. Screwed onto. A cap attaching portion 73 is formed on the rear outer peripheral surface of the tail plug 7, and the cap 9 removed from the pen tip 3 side is detachably fitted to the cap attaching portion 73. An ink visualizing portion 72 is formed on the peripheral wall of the tail plug 7 behind the shaft tube mounting portion 71 and in front of the cap mounting portion 73 so that the ink in the ink tank 8 is visible from the outside.

Further, a forward stepped portion 75 that can come into contact with the rear end of the shaft tube 5 is formed on the outer peripheral surface of the tail plug 7 behind the shaft tube mounting portion 71 and in front of the ink viewing portion 72. In addition, a backward stepped portion 76 that can contact the open end of the cap 9 is formed on the outer peripheral surface of the tail plug 7 in front of the cap mounting portion 73.

In addition, a plurality of (for example, four) axial ribs (not shown) are integrally formed at equal intervals on the outer peripheral surface of the ink viewing portion 72. The ribs prevent slipping when the tail plug 7 is screwed onto the shaft cylinder 5. Further, a rolling prevention protrusion 77 is integrally formed on the outer peripheral surface of the front end portion of the ink visual recognition portion 72 (that is, the outer peripheral surface of the ink visual recognition portion 72 in the vicinity of the forward stepped portion 75). A radial top portion of the rolling prevention protrusion 77 is positioned radially outward from an extension line extending rearward from the outer peripheral surface of the shaft tube 5.

On the inner surface of the rear end wall of the tail plug 7 (the inner surface of the bottom wall of the tail plug 7), a contact wall portion 74 with which the rear end of the ink tank 8 can contact is formed. Thereby, the amount of protrusion of the rear end portion of the ink tank 8 protruding rearward from the rear end of the shaft cylinder 5 can be set large, and the ink color is surely ensured in the region from the front end to the rear end of the ink viewing portion 72 of the tail plug 7. In addition, the remaining amount of ink can be visually confirmed.

The cap 9 is formed of a bottomed cylindrical body having one end opened and the other end closed, and is obtained by injection molding of a synthetic resin (for example, polypropylene or polyethylene). In the present embodiment, it is colored approximately the same color as the ink color.

At the time of writing, the cap 9 is removed from the pen tip 3 side, and the cap 9 is fitted to the cap mounting portion 73 of the tail plug 7. At this time, the front end of the cap 9 is brought into contact with the rearward stepped portion 76 of the tail plug 7, and the ink viewing portion 72 of the tail plug 7 is not covered with the cap 9. Therefore, the ink color and the ink remaining amount inside the ink tank 8 can be reliably recognized from the outside through the ink visualizing unit 72.

When the ink tank is replaced, the tail plug 7 is loosened and removed from the rear end portion of the shaft cylinder 5, and after removing the ink tank 8, a new ink tank 8 is inserted into the shaft cylinder 5, The tail plug 7 is screwed into the rear end portion of the shaft cylinder 5 again. In the process of screwing the tail plug 7 and the rear end portion of the shaft cylinder 5, the rear end of the ink tank 8 and the rear end wall (abutment wall portion 74) of the tail plug 7 come into contact with each other. The ink tank 8 is pressed into the shaft cylinder 5 by screwing with the cylinder 5, and the front end opening of the ink tank 8 is opened.

(Second Embodiment)
FIG. 3 shows an ink tank exchangeable writing instrument 1 according to the second embodiment of the present invention. The present embodiment is a modification of the first embodiment, and is different from the first embodiment in that the mounting cylinder portion 64 projects forward from the front surface of the partition wall 61 and each communication pipe 62 base portion. The restriction wall portion 61a protrudes forward from the front surface of the partition wall 61, and the contact wall portion 74 is formed on the inner surface of the side wall of the tail plug 7.

An abutting wall portion 74 with which the rear end of the ink tank 8 can abut is formed on the inner surface of the side wall of the tail plug 7, and a cap mounting portion 73 is formed on the outer surface of the tail plug 7 behind the abutting wall portion 74. It is formed. Thereby, when the cap 9 is attached to the outer surface of the tail plug 7, the ink tank 8 can be prevented from being covered with the cap 9, and the ink color and the remaining amount of ink inside the ink tank 8 can be more reliably confirmed. Become.

Note that other configurations in the present embodiment are the same as those in the first embodiment, and a description thereof will be omitted. In the present invention, the transparent material constituting the ink tank and the tail plug may be a translucent material as long as the ink color and the remaining amount of ink in the ink tank are visible.

It is a longitudinal cross-sectional view which shows the state which mounted | wore the axial cylinder rear end part in the 1st Embodiment of this invention. It is the sectional view on the AA line of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the axial cylinder rear-end part in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink tank exchange-type writing instrument 2 Writing instrument main body 3 Pen tip 4 Ink occlusion body 5 Shaft cylinder 51 Female thread part 6 Intermediate member 61 Bulkhead 61a Restriction wall part 62 Communication pipe 63 Connection pipe 63a Projection piece 64 Mounting cylinder part 7 End plug 71 Shaft Tube mounting part (Male thread)
72 Ink visual recognition part 73 Cap mounting part 74 Abutting wall part 75 Forward step part 76 Backward step part 77 Rolling prevention protrusion 8 Ink tank 81 Plug body 9 Cap

Claims (6)

An ink tank exchangeable writing instrument in which an ink tank is replaceably housed inside the writing instrument body, wherein the writing instrument body is detachably attached to a shaft cylinder having a pen tip at a front end and a rear end opening of the shaft cylinder A bottomed cylindrical tail plug that is attached and has a front end opened and a rear end closed. The front end of the ink tank is inserted into the shaft cylinder, and the rear end of the ink tank is connected to the shaft cylinder. An ink tank exchangeable writing instrument, wherein the ink tank and the tail plug are made of a transparent material. The ink tank and the tail plug are made of a transparent material. At the front part of the tail plug, a shaft tube mounting part that is detachably attached to the rear end opening of the shaft cylinder is provided, and at the rear part of the tail plug, a cap mounting part to which a cap removed from the pen tip side can be attached. The ink tank exchangeable writing instrument according to claim 1, further comprising an ink visualizing portion provided between the shaft mounting portion and the cap mounting portion of the tail plug so that the ink in the ink tank can be visually recognized from the outside. Provided on the outer peripheral surface of the front part of the tail plug is a male tube part that is detachably attached to the rear end opening of the shaft cylinder, and is removed from the pen tip side on the rear outer peripheral surface of the tail plug. A cap mounting portion to which a cap can be attached, and an ink visualizing portion that allows the ink in the ink tank to be visually recognized from the outside between the shaft tube mounting portion and the cap mounting portion of the tail plug, and the shaft tube Provided on the outer peripheral surface of the tail plug between the mounting portion and the ink viewing portion is a forward stepped portion that can contact the rear end of the shaft tube, and the outer periphery of the tail plug between the ink viewing portion and the cap mounting portion. The ink tank replaceable writing instrument according to claim 1, wherein a reverse stepped portion capable of contacting the open end of the cap is provided on the surface. The ink tank replaceable writing instrument according to claim 2 or 3, wherein a contact wall portion capable of contacting the rear end of the ink tank is formed on an inner surface of the rear end wall of the tail plug or an inner peripheral surface of the cap mounting portion of the tail plug. A contact wall portion with which a rear end of the ink tank can contact is formed on the inner peripheral surface of the side wall of the tail plug, and a cap mounting portion is provided on the outer peripheral surface of the tail plug behind the contact wall portion. The ink tank exchangeable writing instrument according to 2 or 3. A protrusion for preventing rolling is provided in the ink visual recognition portion on the outer peripheral surface of the tail plug, and a radial top portion of the protrusion for preventing rolling is located radially outward from an extension line extending rearward from the outer peripheral surface of the shaft tube. The ink tank exchangeable writing instrument according to any one of claims 2 to 5.

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