JP2010005830A - Multi-refill writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-refill writing utensil which can keep a writing element made up of a refilling pencil smoothly inserted into a barrel from an opening at the rear end of the barrel. <P>SOLUTION: A plurality of writing elements 6 are accommodated in the barrel 2 in the way that the writing element 6 can move back and forth, then a manipulator 7 is connected with the rear end of each writing utensil 6, and each manipulation part 71 of the manipulator 7 is allowed to project outward in the diametral direction, from window holes in the side wall of the barrel 2. In addition, an opening 42, which is freely openable and closable, is formed at the rear end of the barrel 2, and the writing utensil 6 and the manipulator 7 are insertable into the barrel 2 through the opening 42. At least, one of the writing utensils serves as an ejection-type refilling pencil. The refilling pencil comprises a lead accommodating cylinder 61, a connection cylinder 62, a chuck 63, a forward end cylinder 64, a fastening ring 65 and a chuck spring 66. The maximum outside diameter of the forward end cylinder 64, the connection cylinder 62, the lead accommodating cylinder 61 and the chuck spring 66, is formed smaller than the inside diameter of each coil spring 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a multi-core writing instrument. More specifically, the present invention relates to a multi-core writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and the writing body and an operation body connected to the rear end thereof are replaceable.

Conventionally, in this type of multi-core writing instrument, in Patent Document 1, an openable and closable opening is provided at the rear end of the shaft tube to open the window hole backward, and the writing body and the operating body are provided via the opening. In the connected state, it is disclosed that it can be removed from the shaft tube and can be inserted into the shaft tube. Patent Document 1 describes that a mechanical pencil is used as a cursive body, the rear shaft is configured to be movable in the front-rear direction with respect to the front shaft, and the lead core can be extended by advancing the rear shaft. Has been.
JP 2007-38635 A

Even if it is described in Patent Document 1 that a mechanical pencil is adopted as a cursive body, a cursive body composed of a mechanical pencil is more inferior to a cursive body composed of a ballpoint pen (for example, a chuck). The feeding mechanism portion provided with a body or the like) The outer surface has an uneven shape. Therefore, when a cursive body made of mechanical pencil is inserted into the shaft tube from the opening at the rear end of the shaft tube, the front end portion of the cursive body made of mechanical pencil is inside the coil spring that urges the cursive body backward. The writing body made of mechanical pencil cannot be inserted smoothly into the shaft tube because it is easy to get caught in the inner hole of the spring support part where the front end of the coil spring abuts or the window hole where the operating body protrudes radially outward. There is a fear.

An object of the present invention is to provide a multi-core writing instrument capable of smoothly inserting a writing body made of a mechanical pencil into an axial tube from an opening at the rear end of the axial tube. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

[1] In the first invention of the present application, 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 coil spring 8. The operating body 7 is connected to the rear end of the 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, and radially outward from the window holes 41. By projecting the operation portion 71 of each operation body 7 and sliding one operation body 7 forward along the window hole 41, the pen tip of the writing body 6 connected to the one operation body 7 is moved. While projecting from the front end hole 31 of the shaft tube 2, the pen tip of the other writing body 6 that has been in the projecting state is immersed in the shaft tube 2, and further, a window hole is formed at the rear end of the shaft tube 2. An openable and closable opening 42 is provided to open 41 to the rear, and the writing body 6 and the operating body 7 are connected through the opening 42. A multi-core writing instrument configured to be removable from the cylinder 2 and insertable into the shaft cylinder 2, wherein at least one of the writing bodies 6 is a knock-type mechanical pencil, and the mechanical pencil is a lead-core housing cylinder 61. A connecting cylinder 62 attached to the front end of the lead core containing cylinder 61, a chuck body 63 provided at the front end of the connecting cylinder 62, the chuck body 63 accommodated therein, and the connecting cylinder 62 A front end cylinder 64 that is movably mounted in the front-rear direction, a tightening ring 65 that is accommodated in the front end cylinder 64 and clamps the chuck body 63, the front end cylinder 64, and the connecting cylinder 62 And a chuck spring 66 that urges the front end cylinder 64 forward with respect to the connection cylinder 62, and includes the front end cylinder 64, the connection cylinder 62, and the lead core storage cylinder. 61, and a maximum outer diameter of the chuck spring 66 may be a requirement that has been formed smaller than the inner diameter of each of said coil springs 8.

In the multi-core writing instrument 1 of the first invention, the maximum outer diameters of the front end cylinder body 64, the connecting cylinder body 62, the lead core housing cylinder body 61, and the chuck spring 66 are formed smaller than the inner diameters of the coil springs 8. This prevents the writing body 6 from being caught by the coil spring 8 when the writing body 6 made of a mechanical pencil is inserted from the opening 42 at the rear end of the shaft cylinder 2, so that the writing body 6 can smoothly enter the coil spring 8. Is inserted. As a result, even if the outer surface of the front end portion of the writing body 6 made of a mechanical pencil has an uneven shape, the writing body 6 made of a mechanical pencil can be smoothly inserted into the shaft tube 2 from the opening 42 at the rear end of the shaft tube 2. Can be inserted. In the present invention, the coil spring 8 is a compression coil spring. In the present invention, the inner diameter of the coil spring 8 refers to the inner diameter of the coil spring 8 in an uncompressed state (free state).

[2] According to a second invention of the present application, in the multi-core writing instrument according to the first invention, a spring support portion 9 is provided on the inner wall of the shaft cylinder 2 so that the front end of the coil spring 8 abuts. A plurality of inner holes 91 through which each of the writing bodies 6 can be inserted are penetrated in the axial direction, and the front end cylinder body 64, the connecting cylinder body 62, the lead core housing cylinder body 61, and the chuck of the writing body 6 made of the mechanical pencil. It is a requirement that the maximum outer diameter of the spring 66 is smaller than the inner diameter of each inner hole 91.

The multi-core writing instrument 1 of the second invention has the maximum outer diameters of the front end cylinder 64, the connecting cylinder 62, the lead core accommodating cylinder 61, and the chuck spring 66 of the writing body 6 made of a mechanical pencil. Since the writing body 6 made of a mechanical pencil is inserted from the opening 42 at the rear end of the shaft cylinder 2 by being formed smaller than the inner diameter of the hole 91, the writing body 6 is caught in the inner hole 91 of the spring support portion 9. The cursive body 6 is smoothly inserted into the inner hole 91 of the spring support 9. As a result, even if the outer surface of the front end portion of the writing body 6 made of a mechanical pencil has an uneven shape, the writing body 6 made of a mechanical pencil can be smoothly inserted into the shaft tube 2 from the opening 42 at the rear end of the shaft tube 2. Can be inserted.

[3] A third invention of the present application is the multi-core writing instrument of the first or second invention, wherein the front end cylinder 64, the connecting cylinder 62, and the lead core containing cylinder 61 of the writing body 6 made of the mechanical pencil. And the maximum outer diameter of the chuck spring 66 is formed to be smaller than the width dimension W of each of the window holes 41.

The multi-core writing instrument 1 of the third invention has the maximum outer diameters of the front end cylinder body 64, the connecting cylinder body 62, the lead core housing cylinder body 61, and the chuck spring 66 of the writing body 6 made of a mechanical pencil. Since the writing body 6 made of a mechanical pencil is inserted from the opening 42 at the rear end of the shaft cylinder 2, the writing body 6 is prevented from being caught in the window hole 41 by forming the window hole 41 to be smaller than the width dimension W. Then, it is smoothly inserted into the window hole 41 of the spring support portion 9. As a result, even if the front end portion of the writing body 6 made of a mechanical pencil has an uneven shape, the writing body 6 made of a mechanical pencil is smoothly inserted into the shaft tube 2 from the opening 42 at the rear end of the shaft tube 2. can do.

[4] According to a fourth invention of the present application, in the multi-core writing instrument of the first, second or third invention, the nib 64a of the writing body 6 made of a mechanical pencil protrudes from the front end hole 31 of the shaft cylinder 2. In the state, it is a requirement that the operation portion 71 of the operation body 7 protrudes radially outward from the window hole 41 so that the operation portion 71 of the operation body 7 can be pushed forward.

The multi-core writing instrument 1 according to the fourth aspect of the present invention presses the operating portion 71 of the operating body 7 forward in a state where the pen tip 64a of the writing body 6 made of a mechanical pencil protrudes from the front end hole 31 of the shaft cylinder 2. Since the operation part 71 of the operation body 7 protrudes radially outward from the window hole 41 so that it can be operated, the lead-out operation of the lead core is facilitated.

[5] The fifth invention of the present application is the multi-core writing instrument according to the fourth invention, wherein the operating body 7 connected to the rear end of the writing body 6 made of the mechanical pencil is operated from the surface of the operating body 7. It is a requirement that the maximum protrusion length A in the radial direction of the portion 71 is formed to be larger than the maximum radial length B between the front surface of the operation body 7 and the back surface of the operation body 7.

In the multi-core writing instrument 1 of the fifth invention, the operating body 7 connected to the rear end of the writing body 6 made of a mechanical pencil has a maximum protrusion length A in the radial direction of the operating portion 71 from the surface of the operating body 7. The operation portion 71 of the operation body 7 is formed in the pen tip protruding state of the writing body 6 made of a mechanical pencil by forming it longer than the maximum radial length B between the front surface of the operation body 7 and the back surface of the operation body 7. Since it protrudes sufficiently outward in the radial direction from the window hole 41, the operation portion 71 can be directly pressed forward with a finger, and the lead core can be reliably fed out. In the present invention, the surface of the operating body 7 refers to a surface other than the operating portion 71 on the side exposed from the window hole 41 in the operating body 7 accommodated in the shaft tube 2. In the present invention, the back surface of the operating body 7 refers to the side of the operating body 7 accommodated in the shaft cylinder 2 located in the axial direction of the shaft cylinder (that is, the front projecting portion 72 side and the rear projecting portion 73. Side).

[6] The sixth invention of the present application is connected to the rear end of the writing body 6 made of the mechanical pencil (that is, the rear end of the lead core containing cylinder 61) in any one of the first to fifth inventions. Identification for displaying the hardness, thickness, or color of the lead core 67 accommodated in the writing body 6 made of a mechanical pencil (that is, the interior of the lead core housing cylinder 61) on the operation unit 71 of the operation body 7. It is a requirement that the display unit 10 be provided.

The multi-core writing instrument 1 according to the sixth aspect of the present invention is provided with an identification display unit 10 that displays the hardness, thickness, or color of the lead core 67 on the operation unit 71 of the operation body 7. Thus, the hardness, thickness, or color of the lead core 67 accommodated in the cursive body 6 can be easily identified. In particular, when a plurality of writing instruments 6 made of mechanical pencils are accommodated in the barrel 2, the hardness of the lead core 67, the thickness of the lead core 67, or the color of the lead core 67 can be identified and selected quickly and reliably. And you can use your favorite lead core.

In the present invention, the number of the writing bodies 6 accommodated in the shaft cylinder 2 may be two or more, specifically, 2, 3, 4, 5, 6 or the like. It is done.

According to the present invention, a writing body made of a mechanical pencil can be smoothly inserted into the shaft tube from the opening at the rear end of the shaft tube.

1 to 6 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 a coil spring 8 made of 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 of the writing body 6 can protrude is provided in the axial direction. The front shaft 3 and the rear shaft 4 are made of synthetic resin (for example, polycarbonate or the like) or metal.

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 41 are formed at positions symmetrical with respect to the axis.

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 when the pen tip protrudes into the locking wall portion 43. The rear end of the operating body 7 of the writing 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)
At the rear end portion of the rear shaft 4, a lid portion 5 that can open and close the opening portion 42 is provided rotatably. One end of the lid 5 is pivotally connected to the base of the clip 44 by a hinge 52. The hinge portion 52 extends in the left-right direction of the clip 44 when the clip 44 is viewed from the front with the pen tip facing downward, whereby the lid portion 5 is rotatable in a substantially front-rear direction. A contact wall 51 is formed on the front surface of the lid 5. The rear end of the operating body 7 connected to the rear end of the immersive writing body 6 is bumped to the contact wall 51. In the present embodiment, specifically, the hinge portion 52 is configured to be pivotably connected by a pivot shaft. However, in addition to this, the hinge portion 52 has flexibility capable of bending deformation. The structure connected integrally by a connection part or a thin part may be sufficient.

An engagement portion 53 is provided on the front surface of the other end portion of the lid portion 5 (specifically, an engagement recess or an engagement hole portion is formed). An engaged portion 45 that can be engaged with the engaging portion 53 is provided at the rear end of the rear shaft 4 (specifically, an engaging convex portion protrudes). An inward projection is formed on the inner surface of the engagement portion 53 (engagement recess or engagement hole), while the outer surface of the engaged portion 45 (engagement projection) climbs over the inward projection. A lockable outward projection is formed.

The engaging portion 53 and the engaged portion 45 are in an engaged state with each other when the lid portion 5 closes the opening 42 (specifically, the inward projection and the outward projection are overcoming and locked) ), The contact between the operating body 7 and the abutting wall 51 on the front surface of the lid 5 by biasing the coil spring 8 backward does not release the engaged state, and the lid 5 does not open.

In addition to the configuration of the engaging portion 53 and the engaged portion 45, the engaging portion 53 is an engaging convex portion, and the engaged portion 45 is an engaging concave portion or an engaging hole portion. But you can.

(Cursive)
Each of the writing bodies 6 is a knock type mechanical pencil, a lead core housing cylinder 61, and a connecting cylinder 62 removably attached to the front end of the lead core housing cylinder 61 so that a lead core can be replenished; The chuck body 63 provided at the front end of the connecting cylinder 62, the front end of the connecting cylinder 62 and the chuck body 63 are housed therein, and the front end is attached to the connecting cylinder 62 so as to be movable in the front-rear direction. A cylindrical body 64, a fastening ring 65 that is accommodated in the front end cylindrical body 64 and clamps the chuck body 63, and is interposed between the front end cylindrical body 64 and the connecting cylindrical body 62; It comprises a chuck spring 66 that urges the connecting cylinder 62 forward. The front end portion of the front end cylindrical body 64 becomes the pen tip 64 a of the writing body 6.

A lead core 67 is accommodated in the lead core accommodating cylinder 61. When the lead core housing cylinder 61 is pressed forward against the front end cylinder 64 against the bias of the chuck spring 66, the connecting cylinder 62 and the chuck body 63 move forward as the lead core housing cylinder 61 advances. The chuck body 63 is separated from the tightening ring 65. As the chuck body 63 advances, the lead core 67 is fed forward, and the lead core 67 projects forward from the front end opening of the front end cylinder 64. When the forward pressing of the lead core accommodating cylinder 61 against the front end cylinder 64 is released, the chuck body 63 is retracted by the bias of the chuck spring 66 and the tightening ring 65 is engaged with the outer peripheral surface of the chuck body 63. Then, the tightening ring 65 tightens the chuck body 63 inward in the radial direction, so that the chuck body 63 again holds the lead core 67 that has been fed out. Thereby, the protruding state of the lead core 67 from the front end opening of the front end cylindrical body 64 is maintained.

In the present embodiment, the maximum outer diameters of the front end cylinder body 64, the connection cylinder body 62, the lead core housing cylinder body 61, and the chuck spring 66 are the inner diameters of the respective coil springs 8 (in an uncompressed state). It is formed smaller than the inner diameter of the coil spring.

In the present embodiment, the maximum outer diameters of the front end cylinder body 64, the connection cylinder body 62, the lead core housing cylinder body 61, and the chuck spring 66 are larger than the inner diameter of each inner hole 91 of the spring support portion 9. It is formed small.

In the present embodiment, the maximum outer diameters of the front end cylinder 64, the connection cylinder 62, the lead core accommodation cylinder 61, and the chuck spring 66 are formed smaller than the width dimension W of each of the window holes 41. Is done.

(Operation body)
The operating body 7 is attached to the rear end of each of the writing bodies 6 (that is, the rear end opening 42 of the lead core containing cylinder 61). Each of the operating bodies 7 includes an operating portion 71, a rear side protruding portion 73, a front side protruding portion 72, a fitting portion 74, and a flange portion 75. The operation portion 71 is formed at the rear end portion of the operation body 7 and protrudes to the outside from the window hole 41 of the shaft cylinder 2. The rear protruding portion 73 is provided on the opposite side of the operating portion 71 of the operating body 7. The front protrusion 72 is provided in front of the rear protrusion 73 on the opposite side of the operation portion 71 of the operation body 7. The insertion portion 74 is formed at the front end portion of the operation body 7 and is inserted into the rear end opening 42 of the lead core containing cylinder 61. The flange portion 75 is formed behind the fitting portion 74. The rear end of the coil spring 8 is locked to the front surface of the flange portion 75.

Further, locking projections (not shown) are formed on both side surfaces of the operating body 7. The locking projections can be engaged with both side walls of the window hole 41 to prevent it from coming off. The operation body 7 is obtained by a molded body of a synthetic resin (for example, polypropylene resin, ABS resin, polyacetal resin, etc.).

When the pen point 64 a of the writing body 6 is in the immersed state, the rear end portion of the operating body 7 attached to the writing body 6 is hit by a contact wall portion 51 formed at the rear end of the window hole 41. On the other hand, when the pen point 64 a 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 part)
The identification display unit 10 is provided on the outer surface of the operation unit 71 of each operation body 7. The identification display unit 10 displays, for example, the hardness of the lead core 67 accommodated in the lead core containing cylinder 61 to which the operating body 7 is connected, and the lead core to which the operating body 7 is connected. Displaying the thickness of the lead core 67 housed in the housing cylinder 61 or the color of the lead core 67 housed in the lead core housing cylinder 61 to which the operating body 7 is connected. Things.

Examples of the identification display unit 10 that displays the hardness of the lead core include character symbols such as 2H, H, HB, B, and 2B. As for the identification display part 10 which displays the thickness of the said lead core, character symbols, such as 0.3, 0.5, 0.7, are mentioned, for example. As for the identification display part 10 which displays the color of the said lead core, the colored layer of the same color as the color of a lead core is mentioned.

In the present embodiment, the identification display unit 10 is provided on the side surface of the operation unit 71 of the operation body 7 (preferably provided on both side surfaces of the operation unit 71 of the operation body 7). The side surface of the operation unit 71 has a larger area than the surface of the operation unit 71. Therefore, a relatively large identification display portion 10 that can be easily identified even from a distance can be formed. The identification display unit 10 is provided by means such as printing, sticking a sticker, protruding, or recessed. The identification display unit 10 is provided on the side surface of the operation unit 71 protruding outward in the radial direction of the operation body 7 connected to the rear end of the writing body 6 in the pen tip protruding state.

The operating body 7 is formed such that the maximum protruding length A in the radial direction of the operating portion 71 from the surface of the operating body 7 is larger than the maximum radial length B between the surface of the operating body 7 and the back surface of the operating body 7. The Thereby, in a state where the nib 64a of the writing body 6 protrudes from the front end hole 31 of the shaft cylinder 2, the operation body 71 is operated so that the operation portion 71 of the operation body 7 can be pushed forward (that is, the lead lead-out operation can be performed). 7 operation part 71 protrudes largely radially outward from the window hole 41.

In the present embodiment, the maximum protrusion length A in the radial direction of the operation portion 71 from the surface of the operation body 7 is the length in the radial direction between the top of the operation portion 71 and the surface of the operation body 7. In the present embodiment, the maximum radial length B between the front surface of the operating body 7 and the back surface of the operating body 7 is the radial length between the front surface of the operating body 7 and the top of the rear protrusion 73.

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

Further, around each inner hole 91 on the rear surface of the spring support portion 9, a holding portion made of a cylindrical protruding portion protruding rearward is formed. The inner surface of each holding portion is press-fitted and held at the outer surface of the front end portion of each coil spring 8. Thereby, when each writing body 6 and the operation body 7 are exchanged, each coil spring 8 can be prevented from dropping out from the shaft cylinder 2 through the opening 42.

Each coil spring 8 always urges each operation body 7 (that is, each writing body 6) backward. Each of the coil springs 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 is prevented. Each coil spring 8 is in an uncompressed state (free state) before the writing body 6 is inserted through the coil spring 8.

(Invitation of the nib)
The pen tip operation in the present embodiment will be described.
When the operating portion 71 of one operating body 7 is slid forward along the window hole 41 against the back bias of the coil spring 8, the front projecting portion 72 of the operating body 7 that has been slid is moved forward. The rear protrusion 73 of the operation part 71 of the other cursive body 6 in the protruding state is lifted radially outward. As a result, the locked state of the locking wall 43 of the inner wall of the shaft cylinder 2 and the operating body 7 of the other writing body 6 is released, and the other writing body 6 is moved rearward by the rear bias of the coil spring 8. The pen tip 64a of the other writing body 6 is immersed in the shaft cylinder 2, and the rear end of the operation portion 71 of the other writing body 6 is brought into contact with and abutted against the contact wall portion 51 at the rear end of the window hole 41. . Simultaneously with the immersion of the nib 64 a of the other writing body 6, the nib 64 a of the writing body 6 connected to the operating body 7 slid forward is protruded to the outside from the front end hole 31 of the shaft cylinder 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.

(Lead lead feeding operation)
In a state where the pen tip 64a protrudes forward from the front end hole 31 of the shaft cylinder, when the operation portion 71 of the operating body 7 connected to the writing body 6 in the pen tip protruding state is pressed forward, The outer surface of the front end cylinder 64 is locked to the inner wall of the front end portion of the shaft cylinder 2, and the lead core housing cylinder 64, the connecting cylinder 62, and the chuck body 63 are moved forward against the bias of the chuck spring 65. Moved to. Accordingly, the chuck body 63 is released from the clamping of the chuck ring 65, the lead core 67 is fed forward, and the lead core 67 protrudes forward from the front end opening of the front end cylinder 64. When the forward pressing of the operation unit 71 is released, the chuck body 63 is retracted by the bias of the chuck spring 66, the fastening ring 65 is engaged with the outer peripheral surface of the chuck body 63, and the fastening ring 65 is engaged with the chuck body 63. Is clamped inward in the radial direction, and the chuck body 63 holds the lead core 67 drawn out again. Thereby, the protruding state of the lead core 67 from the front end opening (front end of the nib 64a) of the front end cylindrical body 64 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 the writing body 6 is replaced, the operation end portion on the opposite side of the lid portion 5 from the hinge portion 52 is moved backward from the state in which the lid portion 5 closes the opening 42 at the rear end of the shaft cylinder 2 (see FIG. 1). By pressing, the engagement between the engaging portion 53 and the engaged portion 45 is released, the lid portion 5 is rotated rearward, and the opening 42 at the rear end of the shaft tube 2 is opened. When the opening 42 is opened, each operating body 7 is protruded from the opening 42 to the outside by the rear bias of the coil spring 8. In the state where the opening 42 at the rear end of the shaft cylinder 2 is opened (see FIG. 3), the writing body 6 connected to the operation body 7 is passed through the opening 42 by taking out the operation body 7. The new writing body 6 and the new operating body 7 which are taken out from the shaft cylinder 2 and 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 contact wall 51 of the lid 5, and the lid 5 is rotated forward while pressing each operating body 7 forward. The opening 42 is closed by engaging the locked portion. 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 the all-pen-tip immersion state (non-writing state) of embodiment of the multi-core writing instrument of this invention. It is a longitudinal cross-sectional view which shows the state (writing state) in which one nib of the multi-core writing instrument of FIG. 1 protruded. 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. It is an expanded longitudinal cross-sectional view which shows the front-end part of the cursive body of FIG. FIG. 2 is an enlarged vertical cross-sectional view showing a trailing end portion and an operation body of the cursive body of FIG. It is an external view which shows the writing body and operation body in a mutually connected state of FIG.

Explanation of symbols

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 43 Locking wall part 44 Clip 45 Engagement part 5 Lid part 51 Contact wall part 52 Hinge part 53 Engagement part 6 Writing body 61 Lead core containing cylinder 62 Connection cylinder 63 Chuck body 64 Front end cylinder 64a Nib 65 Tightening ring 66 Chuck spring 67 Lead core 7 Operation body 71 Operation part 72 Front projection part 73 Rear projection part 74 Insertion part 75鍔 part 8 Coil spring 9 Spring support part 91 Inner hole 10 Identification display part W Window hole width dimension A Maximum projecting length B in the radial direction of the operation part from the surface of the operation object The surface of the operation object and the back surface of the operation object Maximum radial length of

Claims (6)

A plurality of writing bodies are accommodated in the shaft cylinder so as to be movable in the front-rear direction, each writing body is urged rearward by a coil spring, and an operating body is connected to a rear end of each writing body. A plurality of window holes extending in the front-rear direction are provided in the side wall of each of the plurality of window holes in the radial direction, the operation portions of the respective operation bodies project radially outward from the respective window holes, and one operation body serves as the window hole. The pen tip of the cursive body connected to the one operation body is projected from the front end hole of the shaft cylinder, and the pen tip of the other cursive body that has been in the projecting state is pivoted. In addition, an openable and closable opening that opens the window hole to the rear is provided at the rear end of the shaft cylinder, and the writing body and the operating body are removed from the shaft cylinder through the opening. A multi-core writing instrument configured to be capable of being inserted into a shaft cylinder,
At least one of the cursive letters is a knock-type mechanical pencil,
The mechanical pencil includes a lead core containing cylinder, a connecting cylinder attached to the front end of the lead core containing cylinder, a chuck body provided at the front end of the connecting cylinder, the chuck body being accommodated therein, and A front end cylinder that is attached to the connection cylinder so as to be movable in the front-rear direction, a tightening ring that is accommodated in the front end cylinder and that clamps the chuck body, and a gap between the front end cylinder and the connection cylinder A chuck spring that is interposed and biases the front end cylinder forward with respect to the connection cylinder;
The multi-core writing instrument, wherein the front end cylinder, the connecting cylinder, the lead core containing cylinder, and the chuck spring have a maximum outer diameter smaller than an inner diameter of each of the coil springs. A writing support comprising the mechanical pencil is provided on the inner wall of the shaft cylinder with a spring support portion with which a front end of a coil spring abuts, and a plurality of inner holes through which each writing body can be inserted in the spring support portion in the axial direction. The multi-core writing instrument according to claim 1, wherein the maximum outer diameters of the front end cylindrical body, the connecting cylindrical body, the lead core containing cylindrical body, and the chuck spring are smaller than the inner diameter of each of the inner holes. The multi-core according to claim 1, wherein a maximum outer diameter of a front end cylinder, a connecting cylinder, a lead core housing cylinder, and a chuck spring of the writing body made of the mechanical pencil is smaller than a width dimension of each of the window holes. Writing instrument. In a state where the pen tip of the writing body made of the mechanical pencil protrudes from the front end hole of the shaft cylinder, the operation portion of the operation body is radially outward from the window hole so that the operation portion of the operation body can be pressed forward. The multi-core writing instrument according to any one of claims 1 to 3, which protrudes. The operation body connected to the rear end of the writing body made of the mechanical pencil has a maximum protrusion length in the radial direction of the operation portion from the surface of the operation body in the radial direction between the surface of the operation body and the back surface of the operation body. The multi-core writing instrument according to claim 4, wherein the multi-core writing instrument is formed larger than the maximum length. An identification display that displays the hardness, thickness, or color of the lead core accommodated in the cursive body made of mechanical pencil on the operation part of the operating body connected to the rear end of the cursive body made of mechanical pencil. The multi-core writing instrument according to any one of claims 1 to 5, further comprising a portion.

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