JP2007015277A - Multiple lead writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple lead writing utensil, within the barrel of which a user's favorite writing bodies and operating bodies corresponding thereto can be interchangeably housed and, in addition, the quick and sure interchanging of the writing bodies and the operating bodies is possible. <P>SOLUTION: A plurality of the writing bodies are housed movably back and forth in a barrel 2. Each of the writing bodies are energized rearwards by a resilient body. To the rear end of each of the writing bodies, the operating body corresponding to each writing body is connected. On the side wall of the barrel 2, a plurality of window slits 41 extending back and forth are piercingly provided. Each operating body is made to project radially outwards through each window slit 41. Each writing body is made to be so constituted as to be removably interchangeable from within the barrel 2. The barrel 2 consists of a front shaft 3 equipped with a fore end hole 31 and a rear shaft 4 detachably connected with the rear end part of the front shaft 3. The rear shaft 4 is equipped with the window slits 41 and notched parts 42, which forwardly open the window slits 41. Through the notched parts 42, the operating bodies are so constituted as to be able to remove from within the barrel 2 and to insert within he barrel 2 when the rear shaft 4 is separated from the front shaft 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

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

  The conventional multi-core writing instrument is a sliding body in which the user leaves the sliding body in the shaft cylinder when the user replaces the writing body with a different type from the writing body housed in the shaft cylinder before replacement. 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 5 are accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and each of the writing bodies 5 is urged rearward by a projectile 7 to each of the writing bodies. 5 is connected to the operation body 6 corresponding to each writing body 5, 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 5 connected to the one operation body 6 by projecting each of the operation bodies 6 radially outward from each other and sliding the one operation body 6 forward along the window hole 41. A multi-core writing instrument for causing the tip 51 to protrude from the front end hole 31 of the shaft cylinder 2 and immersing the pen tip 51 of the other writing body 5 in the protruding state into the shaft cylinder 2. 5 is configured to be removable from the shaft cylinder 2 and replaceable, and the shaft cylinder 2 includes a front shaft 3 having a front end hole 31, and the front shaft 3. The rear shaft 4 includes a rear shaft 4 that is detachably connected to a rear end portion. The rear shaft 4 includes a window hole 41 and a notch 42 that opens the window hole 41 forward. It is a requirement that the operating body 6 can be removed from the shaft tube 2 and inserted into the shaft tube 2 through the notch 42 when separated from the shaft 3 (Claim 1).

  The multi-core writing instrument 1 (Claim 1) allows the user to remove the writing body 5 in the shaft cylinder 2 and replace it with a favorite writing body 5, and at the same time remove the operation body 6 from the shaft cylinder 2 and write it. It can be exchanged for one that properly corresponds to the body 5, and erroneous connection between the writing body 5 and the operating body 6 can be prevented. If the operation body 6 is configured to be removed from the shaft cylinder 2 and cannot be replaced, the type of the writing body 5 that can be replaced is limited to only the writing body 5 corresponding to the operation body 6 accommodated in the shaft cylinder 2. However, I cannot exchange my favorite cursive letters 5 freely. Further, the multi-core writing instrument 1 (Claim 1) does not require replacement of small parts as in the prior art, and can perform quick and reliable replacement work.

In the multi-core writing instrument 1 (Claim 1), each of the writing bodies 5 is provided with an opening at the rear end of the front shaft 3, and is configured to be removed and replaced from the shaft tube 2 through the opening. Although it is preferable, the front shaft 3 may be provided with an opening that opens forward, and may be removed from the shaft tube 2 through the opening and replaced.

[2] In the multi-core writing instrument 1 (Claim 1), the writing body 5 and the operation body 6 are connected to each other so as to be removable from the shaft cylinder 2 and insertable into the shaft cylinder 2 (Claim). 2) is preferred.

  The multi-core writing instrument 1 (Claim 2) is configured such that the writing body 5 and the operation body 6 are connected and removable from the shaft tube 2 and can be inserted into the shaft tube 2, so that the writing body 5 and the operation body 6 are operated. The replacement work of the body 6 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 5 and the operation body 6 in a connection state, it will become unnecessary for a user to connect the writing body 5 and the operation body 6. FIG. When the cursive body 5 is replaced, it is possible to reliably prevent the cursive body 5 and the operating body 6 corresponding to the cursive body 5 from being erroneously connected.

[3] In the multi-core writing instrument 1 (Claim 1 or 2), the front end portion of the rear shaft 4 is divided into a plurality of notches 42, and the front end portion of the rear shaft 4 is inserted into the front shaft 3 It is preferable to provide a plurality of possible engagement holes 32 (Claim 3).

  In the multi-core writing instrument 1 (Claim 4), the front end portion of the rear shaft 4 (that is, each divided piece divided into a plurality of front end portions of the rear shaft 4) is inserted into the engagement hole 32 of the front shaft 3. By doing so, it is possible to suppress deformation in the radially inward direction and deformation in the radially outward direction of the front end portion of the rear shaft 4. Further, in the multi-core writing instrument 1 (Claim 4), it is preferable to set the number of divisions of the front end portion of the rear shaft 4 and the number of the engagement holes 32 to be the same. Thereby, when the front end portion of the rear shaft 4 divided into a plurality of parts is inserted into the respective engagement holes 32 of the front shaft 3, the circumferential direction of the front shaft 3 and the rear shaft 4 is ensured in an appropriate direction. Can be matched.

[4] In the multi-core writing instrument 1 (Claim 3), on the inner wall of the front shaft 3, there is provided an elastic body support portion 8 with which the front end of the elastic body 7 abuts in the axial direction, and the outer wall of the elastic body support portion 8 is provided. It is preferable to form the engagement hole 32 between the front wall 3 and the inner wall of the front shaft 3 (Claim 4).

The multi-core writing instrument 1 (Claim 4) can easily form the engagement hole 32 by using the elastic body support portion 8. In addition, although the said elastic body support part 8 is comprised by another components with the front axis | shaft 3, and it is preferable to be fixed to the inner wall of the front axis | shaft 3, you may form integrally with the inner wall of the front axis | shaft 3.

[5] In the multi-core writing instrument 1 (Claims 1 to 4), an elastic body support portion 8 is provided on the inner wall of the front shaft 3 so that the front end of the elastic body 7 abuts in the axial direction. It is preferable to form a holding portion 82 for holding the front end portion of the projectile body 7 in the radial direction in the portion 8 (Claim 5).

  When the operating body 6 is removed from the shaft cylinder 2 by the multi-core writing instrument 1 (Claim 5), the front end portion of the elastic body 7 is held in the radial direction by the holding portion 82. It is possible to prevent the shaft cylinder 2 from dropping out. If the projectile 7 falls out of the shaft 2, it takes time to insert the projectile 7 again when inserting a new operation body 6, and the projectile 7 is lost. There is a fear. The configuration in which the holding portion 82 holds the front end portion of the projectile 7 is, for example, a configuration in which the outer surface of the front end of the projectile 7 is held inward in the radial direction, or the inner surface of the front end of the projectile 7 has a diameter. The structure hold | maintained outside a direction is mentioned.

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

The multi-core writing instrument 1 (Claim 6) is colored in the same color or substantially the same color as the color of the ink contained in each operation body 6, and the ink color of the writing body 5 that operates to project the pen tip, The operation part 61 exposed from the window hole 41 of the shaft tube 2 can be easily identified. Furthermore, the multi-core writing instrument 1 (Claim 6) has an operating body connected to the writing body 5 to be removed by visually recognizing the ink color of the operating body 6 protruding from the window hole 41 when the operating body 6 is replaced. 6 can be easily identified from the window hole 41. Further, when the writing body 5 in a state where the colored operating body 6 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 5 Can be easily identified from a relatively long distance by visually recognizing the operating body 6.

  In the present invention, the operation body 6 corresponding to the writing body 5 is preferably the operation body 6 having an identification display corresponding to the writing body 5. 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 cursive 5 includes, for example, a ballpoint pen, a marking pen, and a mechanical pencil. In the present invention, the shaft cylinder 2 is a rear shaft provided with a front shaft 3 provided with a front end hole 31 from which a pen tip 51 of the writing body 5 can protrude, a side wall provided with a window hole 41 and a rear end provided with an opening 42. 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 employed as the writing body 5, and the lead core can be extended by the advancement of the rear shaft 4. In the present invention, the number of the writing bodies 5 accommodated in the shaft cylinder 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, at the same time that the user can replace the cursive body with a favorite one, the operation body can also be replaced with an appropriate one corresponding to the cursive body, and the erroneous connection between the cursive body and the operation body. Can be prevented. In addition, it is possible to perform a quick and reliable replacement operation without requiring replacement of small parts as in the prior art.

  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 third aspect, it is possible to suppress the radially inward deformation and the radially outward deformation of the front end portion of the rear shaft.

According to the multi-core writing instrument of claim 4, it is easy to form the engagement hole.

According to the multi-core writing instrument of the fifth aspect, when the operating body is removed from the shaft cylinder, it is possible to prevent the elastic body from dropping out of the shaft cylinder.

According to the multi-core writing instrument of the sixth 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. Furthermore, when the operating body is replaced, the operating body connected to the writing body to be removed can be easily identified from the window hole.

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

1 to 5 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 5 are accommodated in a shaft tube 2 so as to be movable in the front-rear direction. Each of the writing bodies 5 is urged rearward by an elastic body 7 (specifically, a compression coil spring).

(Shaft tube)
The shaft cylinder 2 includes a front shaft 3 made of a tapered cylindrical body, and a cylindrical rear shaft 4 detachably connected to a rear end portion of the front shaft 3.

(Front shaft)
The front shaft 3 includes a tapered cylindrical front cylinder portion 33 and a right cylindrical rear cylinder portion 34 connected to a rear end portion of the front cylinder portion 33. A front end hole 31 through which the pen tip 51 of the writing body 5 can protrude is provided in the front end of the front side cylinder portion 33 in the axial direction. The front shaft 3 (that is, the front cylinder portion 33 and the rear cylinder portion 34) and the rear shaft 4 are obtained by injection molding of a synthetic resin (for example, polycarbonate or the like).

(Engagement hole)
A disk-shaped projectile support portion 8 is fixed to the inner wall of the front shaft 2 (specifically, the inner wall of the rear cylinder portion 34). Two engagement holes 32 are formed at symmetrical positions with respect to the axis by the gap between the outer wall of the projectile support portion 8 and the inner wall of the front shaft 3. The engagement hole 32 is inserted into the front end portion of the rear shaft 4 divided into two by the notch portion 42. The two engagement holes 32 align the front shaft 3 and the rear shaft 4 in the circumferential direction when the front end portion of the rear shaft 4 is inserted into the front shaft 3. Thereby, when the front shaft 3 and the rear shaft 4 are connected, the mutual positions in the circumferential direction of the inner hole 81 of the projectile support portion 8 in the front shaft 3 and the window hole 41 on the side wall of the rear shaft 4 are determined. Can be placed properly. Each inner surface of the engagement hole 32 and each outer surface of the front end portion of the rear shaft 4 are detachably press-fitted or unevenly fitted.

(Rear axis)
A plurality of (specifically, two) elongated window holes 41 extending in the front-rear direction and a notch 42 that opens the window hole 41 forward are formed on the rear side wall of the rear shaft 4. It is penetrated radially. The two window holes 41 and the notch 42 are formed symmetrically with respect to the axis. The rear end of the inner wall of the window hole 41 serves as a contact wall portion 41a with which the operating body 6 connected to the rear end portion of the immersed writing body 5 can contact. The front end portion of the rear shaft 4 is divided into two by the cutout portion 42.

When the rear shaft 4 is removed from the rear end portion of the front shaft 3, each window hole 41 is opened forward through the cutout portion 42. The operating body 6 can be easily removed and replaced from the window hole 41 opened forward.

A front end portion of the rear shaft 4 provided with the notch portion 42 is inserted into a rear end opening portion of the front shaft 3, and each of the front end portions of the rear shaft 4 divided into the two is a part of the front shaft 3. It is inserted into and engaged with the engagement hole 32.

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 writing when the pen tip 51 protrudes from the locking wall portion 43. The rear end of the operating body 6 of the body 5 is locked. 3 to 5, the locking wall portion 43 is omitted.

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

(Cursive)
Each of the cursive bodies 5 is a ballpoint pen refill, and includes a ballpoint pen tip (that is, a pen tip 51) in which a ball is rotatably held at the front end, and an ink container having the ballpoint pen tip at the front end and having an open rear end. A tube 52. Inside the ink storage tube 52, an ink composed of a water-based gel ink having shear thinning viscosity, a low-viscosity water-based ink, a low-viscosity oil-based ink, or a high-viscosity oil-based ink is stored. 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 moves forward as the ink is consumed at the rear end of the ink in the ink containing tube 52 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. Further, the ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 52 by press fitting or the like, but in this embodiment, it is fixed to the front end opening of the ink containing tube 52 via the pen tip holder.

(Operation body)
An operation body 6 is attached to the rear end of each of the writing bodies 5 (that is, the rear end opening of the ink containing tube 52). Each operating body 6 includes an operating portion 61 formed at the rear end and protruding outward from the window hole 41 of the shaft cylinder 2, a front protruding portion 62 provided on the opposite side of the operating portion 61, and the operating A rear projecting portion 63 provided behind the front projecting portion 62 on the opposite side of the portion 61, a fitting portion 64 formed at the front end portion and fitted into the rear end opening of the ink containing tube 52, and the fitting portion 64. And a collar portion 65 formed on the rear side. When the insertion portion 64 is inserted into the rear end opening of the ink storage tube 52, the rear end opening of the ink storage tube 52 is not completely blocked, and the inside and the outside of the ink storage tube 52 can be vented. To. In addition, the rear end of the projectile 7 is locked to the front surface of the flange portion 65. In addition, retaining projections are formed on both side walls of the operating body 6. The retaining protrusions can be engaged with the inner surfaces of both side walls of the window hole 41.

  When the pen point 51 of the writing body 5 is in an immersive state, the rear end portion of the operation body 6 attached to the writing body 5 makes an impact on the abutting wall portion 41 a formed at the rear end of the inner wall of the window hole 41. Is done. On the other hand, when the pen point 51 of the writing body 5 is in the protruding state, the rear end portion of the operating body 6 attached to the writing body 5 is locked to a locking wall portion 43 formed on the inner wall of the shaft cylinder 2. The

  The front protruding portion 62 of the operating body 6 connected to the rear end of the writing body 5 in the pen tip immersing state is the other protruding state when the operating portion 61 of the operating body 6 is slid forward. The pendant projecting state of the other cursive object 5 is released by coming into contact with the rear projecting portion 63 of the operating body 6 connected to the rear end of the cursive object 5.

(Identification display)
Each of the operation bodies 6 is colored in substantially the same color as the color of the ink stored in the connected writing body 5 (that is, in the ink storage tube 52). Specifically, each of the operation bodies 6 is formed of a synthetic resin molded body colored in substantially the same color as the ink color of the connected writing body 5. Thereby, the said operation body 6 has the identification display which consists of an ink color display. For example, the operation body 6 connected to the black writing body 5 of the ink color is colored black, the operation body 6 connected to the writing body 5 of the blue ink color is colored blue, and the writing body 5 whose ink color is red. The operating body 6 that is connected to is colored red, and the operating body 6 that is connected to the writing body 5 whose ink color is green is colored green. In the present embodiment, two writing bodies 5 having different ink colors are accommodated in the shaft cylinder 2.

In particular, when the ink storage tube 52 is made of an opaque material, or when the ink storage tube 52 is made of a transparent material and the internal ink is dye ink, it is difficult to visually recognize the internal ink color from the outside. However, in this case, it is effective that the operation body 6 is colored in substantially the same color as the color of the ink. In the pre-replacement writing body 5 existing outside the shaft tube 2, the ink color inside can be easily changed from the outside. Can be identified.

  Further, when each of the writing bodies 5 is a ballpoint pen having a different ball size at the pen tip 51, an identification display consisting of a number representing the outer diameter of the ball at the pen tip 51 is provided on the operation unit 61 of the operation body 6. Is preferred. In addition, when each of the writing bodies 5 is a writing instrument having a different shape of the pen tip 51, it is preferable to provide an identification display corresponding to the shape of the pen tip 51 on the operation unit 61 of the operation body 6. Further, an identification display consisting of a number representing the outer diameter of the ball of the pen tip 51 and an identification display corresponding to the shape of the pen tip 51 are provided on the operation unit 61 of the operation body 6 colored in the ink color. You can also. The identification display is provided on the operation body 6 by means such as printing, sticking a sticker, projecting, or recessed.

(Projection support part)
The projectile support portion 8 has a plurality of (specifically, two) inner holes 81 through which the writing body 5 is inserted in the axial direction. A projectile 7 is disposed between the rear surface of the projectile support 8 and the front surface of the flange 65 of each operation body 6. While the cursive body 5 is loosely inserted in each of the projectiles 7, the front end of each projectile body 7 is locked by the rear surface of the projectile support unit 8, and the rear end of each projectile body 7. Is locked to the front surface of the collar portion 65 of the operating body 6.

  In addition, a holding portion 82 communicating with the inner hole 81 and having an inner diameter slightly larger than the inner hole 81 is formed behind each inner hole 81 on the rear surface of the projectile support portion 8. The inner surface of each holding portion 82 is press-fitted and held at the outer surface of the front end portion of each bullet 7. Thereby, when the front shaft 3 and the rear shaft 4 are separated and each writing body 5 and the operation body 6 are replaced, it is possible to prevent each of the projectile bodies 7 from dropping out of the shaft cylinder 2. A step portion is formed between the inner hole 81 and the holding portion 82 so that the front end of the bullet 7 can abut and be locked.

  Each of the projectile bodies 7 always urges each operation body 6 (that is, each writing body 5) backward. Each of the projectile bodies 7 is in a compressed state (that is, a state in which the writing body 5 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)
The operation of the pen tip 51 in the present embodiment will be described.
When the operating portion 61 of one operating body 6 is slid forward along the window hole 41 against the rear urging of the projecting body 7, the front protrusion 62 of the operating body 6 that has been slid is moved forward. The rear projecting portion 63 of the operation portion 61 of the other cursive body 5 in the projecting state is lifted radially outward. As a result, the locking state of the locking wall portion 43 of the inner wall of the shaft tube 2 and the operating body 6 is released, and the other writing body 5 is moved rearward by the rear urging of the projectile body 7, and the other writing body is moved. The pen tip 51 of 5 is immersed in the shaft cylinder 2, and the rear end of the operation portion 61 of the other writing body 5 is brought into contact with and abutted against the contact wall portion 41 a at the rear end of the inner wall of the window hole 41. . Simultaneously with the immersion of the pen tip 51 of the other writing body 5, the pen tip 51 of the writing body 5 connected to the operation body 6 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 6 that has been slid forward is locked to the locking wall portion 43 of the inner wall of the shaft cylinder 2, and the protruding state of the pen tip 51 is maintained.

(Replace cursive and operating body)
The replacement of the writing body 5 and the operation body 6 in the present embodiment will be described.
When exchanging the cursive body 5, the front shaft 3 and the rear shaft 4 are separated from the connected state of the front shaft 3 and the rear shaft 4 (see FIG. 3) (see FIG. 5). Then, the operating body 6 is taken out from the notch 42 in front of the window hole 41, and the writing body 5 connected to the operating body 6 is taken out from the rear end opening of the front shaft 3. Thereafter, a new operation body 6 connected to the new writing body 5 is inserted into the window hole 41 from the cutout portion 42 of the rear shaft 4, and the new operation body 6 is connected to the new writing body 5. While inserting the body 5 into the inner hole 81 of the projectile support portion 8 in the front shaft 3 from the rear end opening of the front shaft 3, the front end portion of the rear shaft 4 having the cutout portion 42 is inserted into the front shaft 3. The front shaft 3 and the rear shaft 4 are connected again (see FIG. 3) by being inserted into and engaged with the engagement holes 32. Thereby, the exchange of the writing body 5 and the operation body 6 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 AA sectional view taken on the line of the multicore writing instrument of FIG. (However, the cursive, operating body, projectile, and locking wall portion are omitted.) FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a longitudinal cross-sectional view which shows the state which isolate | separated the front axis | shaft and rear axis | shaft of the multi-core writing instrument of FIG. (However, the cursive, operating body, projectile, and locking wall portion are omitted.)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 3 Front shaft 31 Front end hole 32 Engagement hole 33 Front side cylinder part 34 Rear side cylinder part 4 Rear axis 41 Window hole 41a Contact wall part 42 Notch part 43 Locking wall part 44 Clip 5 Writing Body 51 Pen tip (ballpoint pen tip)
52 Ink Containment Tube 6 Operating Body 61 Operating Part 62 Front Projecting Part 63 Rear Projecting Part 64 Insertion Part 65 Gutter Part 7 Elastic Body 8 Elastic Body Support Part 81 Inner Hole 82 Holding Part

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. A multi-core writing instrument for immersing the pen nib of the body into the shaft cylinder, wherein each writing body is configured to be removable from the shaft cylinder and replaceable, and the shaft cylinder includes a front shaft provided with a front end hole, and the front shaft A rear shaft detachably connected to the rear end of the shaft, the rear shaft opening a window hole and the window hole forward A cut-out portion that is configured to be configured such that when the rear shaft is separated from the front shaft, the operating body can be removed from the shaft tube and inserted into the shaft tube through the cut-out portion. A multi-core writing instrument. The multi-core writing instrument according to claim 1, wherein the operating body and the writing body are connected to each other so that the operating body and the writing body can be removed from the shaft tube and inserted into the shaft tube. The multi-core writing instrument according to claim 1 or 2, wherein a front end portion of the rear shaft is divided into a plurality of portions by a notch portion, and a plurality of engagement holes into which the front end portion of the rear shaft can be inserted are provided inside the front shaft. 4. An elastic body supporting portion in which the front end of the elastic body abuts in the axial direction is provided on the inner wall of the front shaft, and the engagement hole is formed between the outer wall of the elastic body supporting portion and the inner wall of the front shaft. The multi-core writing instrument described. Provided on the inner wall of the front shaft is a projectile support section where the front end of the projectile body abuts in the axial direction, and forms a holding section for holding the front end section of the projectile body in the radial direction on the projectile support section. The multi-core writing instrument according to any one of claims 1 to 4. The multi-core writing instrument according to any one of claims 1 to 5, wherein each of the operation bodies is colored with an ink color accommodated in a connected writing body.

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