JP4689378B2 - Multi-core writing instrument - Google Patents

Description

  The present invention relates to a multi-core writing instrument. In detail, it is related with the multi-core writing instrument which accommodated the several writing body in the axial cylinder.

Conventionally, in this type of writing instrument, in Patent Document 1, a sliding body provided with a raised portion is connected to the rear portion of each writing body, the raised portion protrudes outward of the shaft cylinder, and the raised portion is detachable from the sliding body. A configuration has been disclosed in which the shape and color pattern of the raised portion can be selected without selecting the wrong cursive when replacing with a cursive that suits the user's preference. Yes.
JP 2003-11583 A

  In the conventional multi-core writing instrument, when the user replaces the writing body with a different type from the writing body housed in the shaft cylinder before the replacement, the sliding body remains in the shaft cylinder. Then, the cursive body and the raised portion are removed, and then the new cursive body and the new raised portion are attached to the sliding body. Therefore, the replacement work of the cursive body is complicated, and there is a possibility that the user cannot exchange quickly and surely.In addition, when replacing plural cursive bodies at the same time, the cursive body and the cursive body are mistakenly There is a risk of attaching a non-corresponding raised portion to one sliding body. Moreover, since the said protruding part is a small component, it is easy to lose.

  The present invention solves the above-described conventional problems, and allows a user to exchange a favorite writing body and an operating body corresponding to the user's favorite writing body in a shaft cylinder, and can quickly and quickly store the writing body and the operating body. An object of the present invention is to provide a multi-core writing instrument that can be reliably replaced. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

[ 1] According to the present invention, a plurality of writing bodies 6 are accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and each of the writing bodies 6 is urged rearward by a projectile 8 to each of the writing bodies. 6 is connected to the operation body 7 corresponding to each writing body 6, and a plurality of window holes 41 extending in the front-rear direction are provided in the side wall of the shaft cylinder 2 in the radial direction. The pens of the writing body 6 connected to the single operation body 7 are formed by projecting the respective operation bodies 7 radially outward from each other and sliding the single operation body 7 forward along the window hole 41. A multi-core writing instrument that causes the tip 61 to protrude from the front end hole 31 of the shaft cylinder 2 and the pen tip 61 of the other writing body 6 that has been in the protruding state to be immersed in the shaft cylinder 2,
An opening 42 for opening the window hole 41 rearward is provided at the rear end of the shaft cylinder 2, and the operation body 7 and the writing body 6 can be removed from the shaft cylinder 2 through the opening 42 and the shaft cylinder 2 A lid portion 5 that closes the opening 42 is detachably screwed to the rear end portion of the shaft tube 2, and the lid portion 5 includes a cylinder portion 53 having an open front end, A core portion 52 integrally connected to the inner surface of the cylindrical portion 53, a female screw portion 54 is formed on the inner peripheral surface of the cylindrical portion 53, and the female screw portion is formed on the outer peripheral surface of the rear end portion of the shaft cylinder 2. 54, a male thread portion 45 that can be screwed is provided, and the front end portion of the core portion 52 is a contact wall portion 51 that can be contacted by the operating body 7 of the writing body 6 that is immersed, and the outer periphery of the core portion 52 It is a requirement that the surface is in pressure contact with the inner peripheral surface of the rear end portion of the shaft cylinder 2 (Claim 1 ).

In the multi-core writing instrument 1 (Claim 1 ), the operating body 7 and the writing body 6 can be detached from the shaft tube 2 and exchanged through the opening 42, so that the user can remove the writing body 6 in the shaft tube 2. At the same time, the operation body 7 can be removed from the shaft cylinder 2 and replaced with an appropriate one corresponding to the handwriting 6, and the connection between the operation body 7 and the operation body 7 is incorrect. Can be prevented. If the operation body 7 is configured so that it cannot be removed from the shaft cylinder 2 and replaced, the type of the writing body 6 that can be replaced is limited to only the writing body 6 corresponding to the operation body 7 accommodated in the shaft cylinder 2. However, I cannot exchange my favorite cursive 6 freely. Moreover, since the multi-core writing instrument 1 (Claim 1 ) can replace two parts of the writing body 6 and the operation body 7 through the same location (that is, the opening 42), the writing body 6 and the operation body 7 The replacement work is simplified, and the replacement work can be performed quickly and reliably. Further, the multi-core writing instrument 1 (Claim 1 ) can reliably close the opening 42 by removably screwing the lid 5 to the rear end of the shaft tube 2. If the lid 5 is not present, it is difficult to reliably close the opening 42.

In the multi-core writing instrument 1 (Claim 1 ), the opening 42 at the rear end of the shaft tube 2 is at least when the operation body 7 is removed from the shaft tube 2 and when the operation body 7 is moved into the shaft tube 2. It only needs to be open when inserting.

[ 2 ] In the multi-core writing instrument 1 (Claim 1 ), the writing body 6 and the operating body 7 can be detached from the shaft cylinder 2 and inserted into the shaft cylinder 2 through the opening 42 in a connected state. (Claim 2 ) is preferable.

The multi-core writing instrument 1 (Claim 2 ) is configured so that the writing body 6 and the operation body 7 can be removed from the shaft tube 2 and inserted into the shaft tube 2 in a connected state. The replacement work of the body 7 is further simplified, and any user can perform the replacement work quickly and reliably. Moreover, if the said multi-core writing instrument 1 (Claim 2 ) provides a user with the writing body 6 and the operation body 7 in a connection state, it will become unnecessary for a user to connect the writing body 6 and the operation body 7. When the cursive body 6 is replaced, it is possible to reliably prevent the cursive body 6 and the operation body 7 corresponding to the cursive body 6 from being erroneously connected.

The multi-core writing instrument 1 (Claim 1 ) removes the lid 5 when the operating body 7 is replaced, thereby moving the abutting wall 51 from a position where it abuts on the operating body 7, and the rear end of the barrel 2 The opening 42 can be opened sufficiently large, and the operating body 7 can be easily detached from the shaft cylinder 2. If the contact wall portion 51 is fixed to the rear end of the shaft tube 2 and cannot move, the operating body 7 can be replaced even if the opening 42 at the rear end of the shaft tube 2 opens the window hole 41 rearward. In some cases, the amount of opening to the rear of the opening 42 becomes insufficient, and it may be difficult to easily remove the operating body 7 from the opening 42.

In the multi-core writing instrument 1 (Claim 1 ), the openable / closable lid portion 5 is disposed at an appropriate position at which the contact wall portion 51 can contact the operation portion 71 at least when the opening portion 42 is closed. The opening 42 need not be completely closed. Further, since the lid 5 is attached to the rear end portion of the shaft cylinder 2 by screwing, the operating body 7 at the rear end portion of the writing body 6 which has shifted from the pen tip protruding state to the pen tip immersed state is Even if the body 8 is vigorously abutted against the abutting wall 51 by the rear urging force of the body 8, the lid 5 does not easily come off.

[ 3 ] In the multi-core writing instrument 1 (Claim 1 or 2 ), an elastic body support portion 9 in which the front end of the elastic body 8 abuts in the axial direction is provided on the inner wall of the shaft tube 2, and the elastic body support is provided. It is preferable to form a holding portion 92 for holding the front end portion of the bullet member 8 in the radial direction in the portion 9 (Claim 3 ).

When the operating body 7 is removed from the shaft cylinder 2 by the multi-core writing instrument 1 (Claim 3 ), the front end portion of the elastic body 8 is held in the radial direction by the holding portion 92. It is possible to prevent the shaft cylinder 2 from dropping out. If the projectile 8 falls out of the shaft 2, it takes time to insert the projectile 8 again when inserting a new operation body 7, and the projectile 8 is lost. There is a fear. The configuration in which the holding portion 92 holds the front end portion of the projectile 8 is, for example, a configuration in which the outer surface of the front end of the projectile 8 is held inward in the radial direction, or the inner surface of the front end of the projectile 8 has a diameter. The structure hold | maintained outside a direction is mentioned.

[ 4 ] In the multi-core writing instrument 1 (Claims 1 to 3 ), when the opening 42 is opened, the operation body 7 that is immersed due to the rearward urging of the projectile 8 is external to the opening 42. (Claim 4 ) is preferable.

In the multi-core writing instrument 1 (Claim 4 ), when the opening 42 is opened, each operation body 7 is in a protruding state rearward from the opening 42 at the rear end of the shaft cylinder 2; Even if the opening 42 is not downward, the operating body 7 can be easily taken out.

[ 5 ] In the multi-core writing instrument 1 (Claims 1 to 4 ), each of the operation bodies 7 is colored with the color of the ink accommodated in the connected writing body 6 (Claim 5 ). preferable.

In the multi-core writing instrument 1 (Claim 5 ), each operating body 7 is colored in the same color or substantially the same color as the ink accommodated therein, and the ink color of the writing body 6 that is operated to project the pen tip, The operation part 71 exposed from the window hole 41 of the shaft tube 2 can be easily identified. The multi-core writing instrument 1 (Claim 5 ) is an ink-colored writing body to be removed, particularly when the operating body 7 is in a protruding state from the opening 42 when the opening 42 is opened (Claim 4 ). The operating body 7 connected to 6 can be easily identified from the opening 42 by visually recognizing the ink color of the operating body 7 of the writing body 6 protruding from the opening 42. In addition, when the writing body 6 in a state where the colored operation body 7 is connected is in a state before being accommodated in the shaft cylinder 2 (that is, a state outside the shaft cylinder 2), the ink color of the writing body 6 Can be easily identified even from a relatively long distance by visually recognizing the operating body 7.

[ 6 ] In the multi-core writing instrument 1 (Claims 1 to 5 ), the radial direction at the time of insertion of the side surface of the operating body 7 is regulated on both sides of the inner wall of the opening 42 at the rear end of the shaft tube 2. further comprising a guide portion 421 for (claim 6) are preferred.

The multi-core writing instrument 1 (Claim 6 ) can prevent the guide body 421 from inserting the operating body 7 into the shaft tube 2 in an inappropriate direction. Furthermore, it is preferable that the guide portion 421 is set to a shape that can be inserted only when the operation portion 71 of the operation body 7 faces outward in the radial direction. Thereby, when the operating body 7 is inserted with the inner and outer directions in the radial direction reversed (that is, the operating portion 71 of the operating body 7 faces inward), the operating body 7 is pivoted from the opening 42. Insertion into the cylinder 2 becomes impossible, and erroneous assembly of the operating body 7 can be prevented.

In the multi-core writing instrument 1 (Claim 1) , the rear end portion of the shaft tube 2 is divided in the radial direction by the opening portion 42 that opens the window hole 41 rearward, and is easily expanded and deformed radially outward. but the female screw portion 54 provided on the inner peripheral surface of the lid portion 5, an outer peripheral surface of the rear end of the barrel 2, and more and this provided a screwable male screw portion 45 in the female screw portion 54 Further, it is possible to prevent the rear end portion of the shaft cylinder 2 from expanding outward in the radial direction.

In the present invention, the operation body 7 corresponding to the writing body 6 is preferably the operation body 7 having an identification display corresponding to the writing body 6. Examples of the identification display include ink color display, pen tip size display, handwriting width display, and pen tip type display. In the present invention, the writing body 6 includes, for example, a ballpoint pen, a marking pen, and a mechanical pencil. In the present invention, the barrel 2 is a rear shaft provided with a front shaft 3 provided with a front end hole 31 through which a pen tip 61 of the writing body 6 can project, a window hole 41 provided on a side wall, and an opening 42 provided at a rear end. The structure which consists of the axis | shaft 4 may be sufficient. Further, the rear shaft 4 is configured to be movable in the front-rear direction with respect to the front shaft 3, a mechanical pencil is adopted as the writing body 6, and the lead core can be extended by the advancement of the rear shaft 4. In the present invention, the number of writing bodies 6 accommodated in the shaft tube 2 may be two or more, and specifically, 2, 3, 4, 5, 6, etc. may be mentioned. It is done.

According to the multi-core writing instrument of claim 1 , the operation body and the writing body can be exchanged through the opening, and the user can exchange the writing body with a favorite one at the same time, and the operation body also appropriately corresponds to the writing body. It can be exchanged for things, and erroneous connection between the cursive body and the operation body can be prevented. Moreover, the replacement work of the writing body and the operation body is simplified, and the replacement work can be performed quickly and reliably. Moreover, the opening part can be reliably closed by screwing the cover part to the rear end part of the shaft tube so as to be detachable.

According to the multi-core writing instrument of claim 2 , the replacement work of the writing body and the operation body is further simplified, and any user can perform the replacement work quickly and reliably. In addition, if the cursive body and the operation body are provided to the user in a connected state, it becomes unnecessary for the user to connect the cursive body and the operation body, and when replacing the cursive body, the cursive body and the cursive body are supported. It is possible to reliably prevent erroneous connection with the operated body.

According to the multi-core writing instrument of the first aspect , when replacing the operating body, the opening at the rear end of the shaft cylinder can be opened sufficiently large, and the operating body can be easily removed from the inside of the shaft cylinder. Moreover, even if the operating body at the rear end of the writing body that has transitioned from the pen tip protruding state to the pen tip immersed state is abutted against the abutting wall portion, the lid portion does not easily come off.

According to the multi-core writing instrument of claim 3 , it is possible to prevent the projectile from dropping out of the shaft cylinder.

According to the multi-core writing instrument of the fourth aspect , when the opening is opened, the operating body can be easily removed without setting the opening at the rear end of the shaft tube downward.

According to the multi-core writing instrument of the fifth aspect , the ink color of the writing body for pen tip protruding operation can be easily identified by the operation portion exposed from the window hole of the shaft tube.

According to the multi-core writing instrument of the sixth aspect , the guide portion can prevent the operating body from being inserted into the shaft tube in an inappropriate direction.

According to the multi-core writing instrument of claim 1 , it is possible to prevent the rear end portion of the shaft tube from expanding outward in the radial direction.

1 to 8 show an embodiment of the present invention.
In the multi-core writing instrument 1 of the present embodiment, a plurality (specifically, two) of writing bodies 6 are accommodated in a shaft tube 2 so as to be movable in the front-rear direction. Each of the writing bodies 6 is urged rearward by an elastic body 8 (specifically, a compression coil spring).

(Shaft tube)
The shaft cylinder 2 includes a front shaft 3 formed of a tapered cylindrical body, and a cylindrical rear shaft 4 attached to the rear end portion of the front shaft 3 by screwing or press-fitting. At the front end of the front shaft 3, a front end hole 31 through which the pen tip 61 of the writing body 6 can protrude is provided in the axial direction. The front shaft 3 and the rear shaft 4 are obtained by injection molding of a synthetic resin (for example, polycarbonate).

  A plurality (specifically, two) elongated window holes 41 extending in the front-rear direction are provided in a radial direction in the rear side wall of the rear shaft 4. The two window holes are formed at symmetrical positions with respect to the axis. An opening 42 is formed at the rear end portion of the rear shaft 4 so as to penetrate in the axial direction and open radially outward. The opening 42 communicates with the window hole 41 at the rear end of the rear shaft 4 (that is, the rear end of the shaft cylinder 2), whereby the rear end of the window hole 41 is notched rearward and opened rearward. On the other hand, the front end of the window hole 41 is always closed.

The side wall of the rear end portion of the rear shaft 4 (the rear end portion of the shaft cylinder 2) is divided in the radial direction by a window hole 41 having the rear end opened rearward. A male screw portion 45 is formed on the outer peripheral surface of the side wall of the rear end portion of the rear shaft 4.

Guide walls 421 are formed on the inner walls on both sides of the front end of the opening 42 so as to slide with the side surface of the operating body 7 when the operating body 7 is inserted, and regulate the orientation of the side surface of the operating body 7. Further, the guide portion 421 is formed with a concave portion 421a into which the retaining projection 76 of the operating body 7 can be inserted.

  Further, a locking wall portion 43 made of a rib extending in the front-rear direction is formed on the inner surface of the side wall between the window holes 41 of the rear shaft 4, and the pen tip 61 protrudes from the locking wall portion 43. The rear end of the operating body 7 of the cursive body 6 is locked.

  A clip 44 is provided on the outer surface of the side wall between the window holes 41 of the rear shaft 4.

(Cover)
A lid 5 capable of closing the opening 42 is detachably screwed to the rear end of the rear shaft 4.
The lid portion 5 includes a cylindrical portion 53 whose front end is opened, and a core portion 52 that is integrally connected to the inner surface of the cylindrical portion 53 (specifically, the inner peripheral surface of the rear end portion of the cylindrical portion 53). Become. A female screw portion 54 is formed on the inner peripheral surface of the cylindrical portion 53. The female screw portion 54 of the cylindrical portion 53 is screwed with the male screw portion 45 at the rear end portion of the rear shaft 4.

The front end portion of the core portion 52 has a cylindrical shape and is screwed to the rear end portion of the rear shaft 4 of the lid portion 5 (that is, the female screw portion 54 of the cylindrical portion 53 and the rear end portion of the rear shaft 4). And the male threaded portion 45 of the first threaded portion 45) are inserted into the guide portion 421 and abut against the rear end of each operating body 7 connected to the rear end of the immersed writing body 6. It becomes the wall part 51. Further, when the cylindrical portion 53 of the lid portion 5 is screwed to the rear end portion of the rear shaft 4, the rear outer peripheral surface of the core portion 52 is the rear end portion of the rear shaft 4 having the male screw portion 45 on the outer peripheral surface. It is press-contacted with the inner peripheral surface. As a result, when the rear end portion of the rear shaft 4 divided in the radial direction by the window hole 41 having the rear end opened, the cylindrical portion 53 of the lid portion 5 is screwed to the rear end portion of the rear shaft 4 in the radial direction. Deformation inward can be suppressed.

(Cursive)
Each of the writing bodies 6 is a ball-point pen refill, and includes a ball-point pen tip (that is, a pen tip 61) in which a ball is rotatably held at the front end, and an ink container provided with the ball-point pen tip at the front end and opened at the rear end. A tube 62. Inside the ink storage tube 62 is accommodated an ink composed of a water-based gel ink having shear thinning viscosity, a low-viscosity aqueous ink, a low-viscosity oil-based ink, or a high-viscosity oil-based ink. When the ink is a water-based gel ink having shear thinning viscosity, a low-viscosity water-based ink, or a low-viscosity oil-based ink, a high-viscosity fluid that advances as the ink is consumed is disposed at the rear end of the ink in the ink containing tube 62. A follower consisting of is filled.

Further, the ballpoint pen tip may be configured such that a ball held rotatably at the front end is urged forward by a projectile or the like, and the ball is brought into close contact with the inner surface of the front end edge portion. The ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 62 by press fitting or the like, but in this embodiment, it is fixed to the front end opening of the ink containing tube 62 via the pen tip holder.

(Operation body)
An operation body 7 is attached to the rear end of each of the writing bodies 6 (that is, the rear end opening of the ink containing tube 62). Each of the operating bodies 7 includes an operating portion 71 formed at the rear end and projecting outside from the window hole 41 of the shaft cylinder 2, a front projecting portion 72 provided on the opposite side of the operating portion 71, A rear projecting portion 73 provided behind the front projecting portion 72 on the opposite side of the portion 71, a fitting portion 74 formed at the front end portion and fitted into the rear end opening of the ink containing tube 62, and the fitting portion 74. And a collar portion 75 formed on the rear side. The insertion portion 74 does not completely block the rear end opening of the ink storage tube 62 when inserted into the rear end opening of the ink storage tube 62, and can vent the inside and the outside of the ink storage tube 62. To. In addition, the rear end of the bullet 8 is locked to the front surface of the flange 75. Further, a retaining projection 76 is formed on both side walls of the operating body 7. The retaining protrusion 76 can be engaged with the inner surfaces of both side walls of the window hole 41.

  When the pen point 61 of the writing body 6 is in an immersive state, the rear end portion of the operating body 7 attached to the writing body 6 is hit by an abutting wall portion 51 formed on the front surface of the lid portion 5. On the other hand, when the pen point 61 of the writing body 6 is in a protruding state, the rear end portion of the operating body 7 attached to the writing body 6 is locked to a locking wall portion 43 formed on the inner wall of the shaft cylinder 2. The

  The front projecting portion 72 of the operating body 7 connected to the rear end of the writing body 6 in the pen tip immersing state is the other projecting state when the operating portion 71 of the operating body 7 is slid forward. The pendant projecting state of the other cursive body 6 is released by contacting the rear projecting portion 73 of the operating body 7 connected to the rear end of the cursive body 6.

(Identification display)
Each of the operation bodies 7 is colored in substantially the same color as the color of the ink stored in the connected writing body 6 (that is, in the ink storage tube 62). Specifically, each of the operation bodies 7 is formed of a synthetic resin molded body colored in substantially the same color as the ink color of the connected writing body 6. Thereby, the said operation body 7 has the identification display which consists of an ink color display. For example, the operating body 7 connected to the black writing body 6 with the ink color is colored black, the operating body 7 connected to the writing body 6 with the blue ink color is colored blue, and the writing body 6 with the red ink color. The operating body 7 connected to is colored red, and the operating body 7 connected to the writing body 6 whose ink color is green is colored green. In the present embodiment, two writing bodies 6 having different ink colors are accommodated in the shaft cylinder 2.

  Further, when each of the writing bodies 6 is a ballpoint pen having a different ball size at the nib 61, an identification display made up of a number representing the outer diameter of the ball at the nib 61 is provided on the operation unit 71 of the operation body 7. Is preferred. Further, when each writing body 6 is a writing instrument having a different shape of the pen tip 61, it is preferable to provide an identification display corresponding to the shape of the pen tip 61 on the operation unit 71 of the operation body 7. Further, an identification display consisting of a number representing the outer diameter of the ball of the pen point 61 and an identification display corresponding to the shape of the pen point 61 are provided on the operation portion 71 of the operation body 7 colored in the ink color. You can also. The identification display is provided on the operation body 7 by means such as printing, sticking a sticker, protruding, or recessed.

In particular, when the ink containing tube 62 is made of an opaque material or when the ink containing tube 62 is made of a transparent material and the ink inside is dye ink, it is difficult to visually recognize the ink color inside. However, it is effective that the operation body 7 is colored in substantially the same color as the color of the ink, so that the ink color inside the handwritten body 6 before replacement existing outside the shaft cylinder 2 can be easily identified from the outside. .

(Projection support part)
A cylindrical projectile support part 9 is provided on the inner wall of the shaft cylinder 2 (that is, the inner wall of the rear shaft 4). The projectile support 9 has a plurality of (specifically, two) inner holes 91 through which the writing body 6 is inserted, extending in the axial direction. A projectile 8 is disposed between the rear surface of the projectile support 9 and the front surface of the collar 75 of each operation body 7. While the cursive body 6 is loosely inserted into each of the bullet bodies 8, the front end of each bullet body 8 is locked by the rear surface of the bullet body support portion 9, and the rear end of each bullet body 8. Is locked to the front surface of the collar portion 75 of the operating body 7.

  Further, around each inner hole 91 on the rear surface of the projectile support 9, a holding portion 92 made of a cylindrical protruding portion protruding rearward is formed. The inner surface of each holding portion 92 is press-fitted and held at the outer surface of the front end portion of each bullet member 8. Thereby, when each writing body 6 and the operation body 7 are exchanged, it is possible to prevent each of the projectile bodies 8 from dropping out of the shaft tube 2 through the opening 42.

  Each of the projectile bodies 8 always urges each operation body 7 (that is, each writing body 6) backward. Each of the elastic bodies 8 is in a compressed state (that is, a state in which the writing body 6 is urged rearward) in both the pen tip protruding state and the pen tip immersing state. Shaking back and forth is prevented.

(Invitation of the nib)
A description will be given of the operation of the pen tip 61 in the present embodiment.
When the operating portion 71 of one operating body 7 is slid forward along the window hole 41 against the rear urging of the projectile 8, the front projecting portion 72 of the operating body 7 that has been slid is moved forward. The rear projecting portion 73 of the operation portion 71 of the other cursive body 6 in the projecting state is lifted radially outward. As a result, the locking state between the locking wall portion 43 of the inner wall of the shaft cylinder 2 and the operating body 7 is released, and the other writing body 6 is moved rearward by the rear urging of the projectile body 8, so that the other writing body. The pen nib 61 of 6 is immersed in the axial cylinder 2, and the rear end of the operation part 71 of the other writing body 6 is contacted and stopped by the contact wall part 51 of the front surface of the cover part 5. Simultaneously with the immersion of the pen tip 61 of the other writing body 6, the pen tip 61 of the writing body 6 connected to the operating body 7 slid forward is projected outside from the front end hole 31 of the shaft tube 2. At the same time, the rear end of the operating body 7 that has been slid forward is locked to the locking wall 43 of the inner wall of the shaft tube 2, and the pen tip protruding state is maintained.

(Replace cursive and operating body)
The replacement of the writing body 6 and the operation body 7 in the present embodiment will be described.
When replacing the writing body 6, the cover 5 closes the opening 42 at the rear end of the shaft cylinder 2 (see FIG. 7), so that the female screw portion 54 of the cover 5 and the rear end of the shaft cylinder 2 By releasing the screwed state with the male screw portion 45 and removing the lid portion 5 from the rear end portion of the shaft tube 2, the opening 42 at the rear end of the shaft tube 2 is opened. When the opening 42 is opened, each operation body 7 is protruded from the opening 42 to the outside by the rear urging of the projectile 8. With the opening 42 at the rear end of the shaft cylinder 2 opened (see FIG. 8), the operation body 7 is taken out, and the writing body 6 connected to the operation body 7 is connected to the opening 42. Then, the new writing body 6 and the new operation body 7 that are connected to each other are inserted into the shaft cylinder 2 through the opening 42. Then, each operating body 7 is brought into contact with the abutting wall portion 51 of the lid 5, and the lid 5 is screwed to the rear end portion of the shaft tube 2 while pressing each operating body 7 forward, The opening 42 is closed. Thereby, the exchange work of the writing body 6 and the operation body 7 is completed.

It is a longitudinal cross-sectional view which shows all the nib immersion states (at the time of non-writing) of embodiment of the multi-core writing instrument of this invention. It is a longitudinal cross-sectional view which shows the state (at the time of writing) which one nib of the multi-core writing instrument of FIG. 1 protruded. It is the AA line expanded sectional view which abbreviate | omitted the operation body of the rear-end part of the multi-core writing instrument of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a side view which shows the state which closed the opening part of the rear end of the multi-core writing instrument of FIG. It is a side view which shows the state which opened the opening part of the rear end of the multi-core writing instrument of FIG.

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 3 Front shaft 31 Front end hole 4 Rear shaft 41 Window hole 42 Opening part 421 Guide part 421a Recess 43 Locking wall part 44 Clip 45 Male thread part 5 Lid part 51 Contact wall part 52 Core part 53 Cylindrical part 54 Female thread part 6 Cursive body 61 Pen tip (ballpoint pen tip)
62 Ink receiving tube 7 Operating body 71 Operating section 72 Front projecting section 73 Rear projecting section 74 Insertion section 75 Hook section 76 Retaining protrusion 8 Ejection body 9 Ejection body support section 91 Inner hole 92 Holding section

Claims (6)

A plurality of writing bodies are accommodated in the shaft cylinder so as to be movable in the front-rear direction, and each of the writing bodies is urged rearward by a projectile, corresponding to each writing body at the rear end of each of the writing bodies. The operating bodies are connected, and a plurality of window holes extending in the front-rear direction are provided in the radial direction on the side wall of the shaft cylinder, and the respective operating bodies are protruded radially outward from the respective window holes. By sliding the operating body forward along the window hole, the pen tip of the writing body connected to that one operating body is projected from the front end hole of the shaft tube, and the other writing that was in the protruding state first. It is a multi-core writing instrument that immerses the pen tip of the body into the shaft cylinder, provided at the rear end of the shaft cylinder with an opening that opens the window hole backward, and the operating body and the writing body through the opening, A lid portion configured to be removable from the shaft tube and to be inserted into the shaft tube and closing the opening is a rear end portion of the shaft tube Removably screwed, the lid portion includes a cylindrical portion whose front end is open, and a core portion integrally connected to the inner surface of the cylindrical portion, and an internal thread portion is provided on the inner peripheral surface of the cylindrical portion. And a male screw part that can be screwed into the female screw part is provided on the outer peripheral surface of the rear end part of the shaft cylinder, and the front end part of the core part is abutted against the operation body of the immersive writing body. A multi-core writing instrument, characterized in that the outer peripheral surface of the core portion comes into contact with the inner peripheral surface of the rear end portion of the shaft tube . The multi-core writing instrument according to claim 1, wherein the writing body and the operating body are connected to each other through the opening and can be removed from the shaft tube and inserted into the shaft tube . Provided on the inner wall of the shaft cylinder is a projectile support part in which the front end of the projectile body abuts in the axial direction, and a holding section for holding the front end part of the projectile body in the radial direction is formed on the projectile support unit. The multi-core writing instrument according to claim 1 or 2 . 4. The multi-core writing instrument according to claim 1, wherein when the opening portion is opened, each operation body protrudes outward from the opening portion by urging the elastic body backward . 5. The multi-core writing instrument according to any one of claims 1 to 4 , wherein each of the operation bodies is colored with an ink color accommodated in a connected writing body . The multi-core writing instrument according to any one of claims 1 to 5 , further comprising guide portions for restricting a radial direction when the side surface of the operating body is inserted on both sides of the inner wall of the opening portion of the rear end portion of the shaft cylinder. .

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