JP2011088287A - Multi-lead writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-lead writing utensil capable of solving an inconvenience generated in a writing body caused by an impact during returning by using a structure of an existing product as it is without making an assembling process complicate by increasing the number of components and changing the structure such as making the shaft diameter thick. <P>SOLUTION: In the multi-lead writing utensil 1, a plurality of writing elements 4 are stored in a tip-opened shaft cylinder 2 by energizing them backward by elastic members 6, and sliding bodies 5 are respectively connected with back ends of the writing elements 4, and operating parts 51 on the outer faces of the sliding bodies are projected outward in the radial directions from a plurality of window holes 23 provided on the outer peripheral face on the back of the shaft cylinder, and by sliding the operating parts 51 forward, either one of the writing elements 4 is forwarded to project a pen-point 41 from the tip opening part 24 of the shaft cylinder, and the other writing elements 4 at forwarding positions are retreated. The sliding bodies 5 are composed of an elastomer with a Shore A hardness of 70-95, and a DLC coating is applied on at least inner faces of the sliding bodies 5. <P>COPYRIGHT: (C)2011,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 a pen tip of one writing body is selectively protruded from a tip end of the shaft cylinder by an appearance operation.

Conventionally, among a multi-core writing instrument, a plurality of writing bodies, which are connected to a sliding body at the rear end, are urged rearward by a resilient member and accommodated in a shaft cylinder, so that any one of them is slid forward. In a multi-core writing instrument in which the pen tip of the cursive body protrudes and the other cursive body in the advanced position retreats, so-called slide-type writing instrument, when the cursive body is retracted (returned), it slides between the receiving part of the shaft tube and the sliding part. The pen tip is accommodated by stopping by colliding with a moving object.
In the above structure, when the receiving part of the shaft cylinder and the sliding body collide, a strong impact in the front-rear direction is generated, so the writing body is a ballpoint pen or a mechanical pencil with a built-in ink having a low viscosity or shear thinning viscosity. In some cases, ink movement or air mixing may occur due to impact, or the mechanical pencil lead to be accommodated may break.
Therefore, in order to solve the above-mentioned problem, by providing a buffer member between the receiving portion of the rear end of the shaft tube that abuts the sliding body at the time of return and the sliding body, the impact at the time of return is reduced, and the mechanical pencil core is A compound writing instrument that prevents folding and ink movement is disclosed (for example, see Patent Documents 1 and 2).

  The multi-core writing instrument disclosed in the above-mentioned patent document can relieve the impact at the time of return through the buffer member and prevent the mechanical pencil core from breaking, but the number of parts increases by adding the buffer member, Since the structure becomes complicated, the assembly process becomes complicated and the manufacturing cost increases.

In view of this, there has been disclosed a structure in which a hook portion serving as an abutting portion at the time of return is provided in front of the sliding body, and a buffering action is provided by forming concave portions in both front and rear directions of the hook portion (see, for example, Patent Document 3).
In the multi-core writing instrument disclosed in Patent Document 3, since the sliding body and the buffer portion are composed of one member, the impact can be reduced without increasing the manufacturing cost, but the contact at the time of return than the rear end receiving portion. Since the area is small, the impact mitigation effect is low, and the flange is formed on both sides of the operating part of the sliding body on the outside (in the direction of the window hole) so that it becomes wider and the number of sliding bodies to be accommodated increases. The outer diameter of the writing tube becomes thicker. Moreover, since it is necessary to change the shape of the sliding body and the structure of the shaft cylinder (receiving part), a new mold is required, which cannot be applied to existing products.

Japanese Utility Model Publication No. 5-28687 JP-A-8-207491 JP 2009-826

  The present invention solves the above-mentioned conventional problems and uses the structure of an existing product as it is without making the assembly process complicated by increasing the number of parts or changing the structure such as increasing the shaft diameter. Therefore, it is intended to provide a multi-core writing instrument that can eliminate problems that occur in the writing body due to an impact at the time of return. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

The present invention accommodates a plurality of writing bodies in a shaft cylinder having an opening at the front end by biasing them by a resilient member, and connects the sliding bodies to the rear ends of the writing bodies, respectively. By projecting the portion radially outward from a plurality of window holes provided on the outer peripheral surface of the rear side of the shaft cylinder and sliding the operation section forward, one of the writing bodies is advanced to move the pen tip to the shaft cylinder. A multi-core writing instrument that protrudes from the front end opening and retreats another writing body at an advanced position, wherein the sliding body is made of an elastomer having a Shore A hardness of 70 to 95, and at least the inner surface of the sliding body It is a requirement that a DLC coating is applied to the material.
Furthermore, it is a requirement that the rear of the window hole has an opening that can be opened and closed, and that the writing body and the sliding body can be taken out from the shaft cylinder and inserted into the shaft cylinder through the opening. .

  In accordance with the present invention, there is a problem that occurs in the writing body due to impact at the time of return using the structure of the existing product as it is without making the assembly process complicated by increasing the number of parts or changing the structure such as increasing the shaft diameter of the writing instrument. Can provide a multi-core writing instrument.

  According to the second aspect, even if the multi-core writing instrument has a structure that can easily accommodate the writing body arbitrarily selected by the user, the problem due to the impact at the time of return can be solved by using the existing structure as it is.

It is a longitudinal cross-sectional view of the Example of the multi-core writing instrument of this invention. It is a principal part expanded sectional view of FIG.

1 and 2 show an embodiment of the present invention. In addition, this invention is not limited to the multi-core writing instrument of the following structures, Even if it is a multi-core writing instrument of a general purpose structure, it is applicable.
In the multi-core writing instrument 1 of the present embodiment, a plurality (specifically, two) of writing bodies 4 (for example, a ballpoint pen, a marking pen, a mechanical pencil, etc.) are accommodated in a shaft tube 2 so as to be movable in the front-rear direction. ing. Each of the writing bodies 4 is urged rearward by a resilient member 6 made of a compression coil spring.
In addition, the number of the writing bodies 4 accommodated in the shaft cylinder 2 should just be two or more, Specifically, two, three, four, five, six, etc. are mentioned, In this case as well, it is preferable that they are arranged at equal intervals on the same circumference centered on the axis when viewed in cross section.

The shaft cylinder 2 is screwed into a front shaft 21 that is a cylindrical body in which a tip opening 24 through which a pen tip 41 of the writing body 4 can protrude is penetrated in the axial direction, and a rear end portion of the front shaft 21. It is constituted by a cylindrical rear shaft 22 attached by press fitting.
The shaft cylinder 2 is made of a synthetic resin such as polycarbonate, polyethylene, ABS, or a metal.

A plurality of (specifically, two) elongated window holes 23 extending in the front-rear direction are provided in the rear side wall of the rear shaft 22 in the radial direction. The two window holes 23 are formed at symmetrical positions with respect to the axis (in the case of three or more, the positions are equal in the radial direction with respect to the axis).
Further, a locking wall portion made of a rib or the like extending in the front-rear direction is provided on the inner surface of the side wall between the window holes 23, and the writing body 4 is engaged at the rear end of the sliding body 5 when the pen tip protrudes. It is configured to be stopped (not shown).
Furthermore, a clip can be provided on the outer surface of the side wall between the window holes 23 of the rear shaft 22.

The rear end portion of the rear shaft 22 is provided with a lid portion 3 that allows the rear of the window hole 23 to be opened and closed, and the writing body 4 connected to the sliding body 5 can be replaced with the lid portion 3 opened. It has a simple structure.
One end portion in the radial direction of the lid portion 3 is pivotally connected to the clip base portion by a hinge portion. Further, since the rear end of the sliding body 5 connected to the writing body 4 is stopped at the front of the lid portion 3 when it is immersed, it engages with the engaging portion (specifically, the shaft cylinder side engaged portion). For example, an engagement recess or an engagement hole) is formed so as not to be easily opened.
In addition to the configuration in which the lid 3 is pivotally connected by the hinge portion, the lid portion 3 may be integrally connected by a flexible connecting portion or a thin portion that can be bent and deformed, A rotation opening type, a detachable type, etc. may be sufficient.

The two writing bodies 4 accommodated in the shaft cylinder are ball pen refills, and a ball pen tip (pen tip 41) having a ball rotatably held at the front end, the ball pen tip at the front end, and a rear end And an ink containing tube 42 opened. The ink containing tube 42 contains an ink 43 made of a water-based gel ink having shear thinning, a low-viscosity water-based ink, a low-viscosity oil-based ink, a high-viscosity oil-based ink, or the like. The ink follower 44 made of a high-viscosity fluid that advances as the ink 43 is consumed is filled at the rear end of the ink 43.
The ballpoint pen tip may be configured such that the ball is urged forward by a projectile or the like, and the ball is brought into close contact with the inner surface of the front edge portion. Further, the ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 42 by press fitting or the like, but in the present embodiment, it is fixed to the front end opening of the ink containing tube 42 via the pen tip holder.
In the present embodiment, a ballpoint pen refill is adopted as the writing body 4, but a marking pen form using a marking pen tip made of fiber or resin at the pen tip, a mechanical pencil form, or the like can also be applied. Furthermore, the fiber convergence body can be accommodated in the ink accommodating tube.

  At the rear end of each of the writing bodies 4 (that is, the rear end opening of the ink containing tube 42), the sliding body 5 made of an elastomer (specifically, EPDM (ethylene-propylene-diene monomer of Shore A hardness 80)). Ternary copolymer rubber)] is attached. Each of the sliding bodies 5 includes an operation portion 51 that protrudes to the outside from the window hole 23 of the shaft cylinder 2 and a collar portion 52 that is formed at the rear of the connection portion with the rear end of the ink containing tube 42. By moving 51 forward, the pen tip 41 of the cursive 4 connected forward is projected. Further, the collar portion 52 engages the rear end of the resilient member 6 on the front surface, and when the pen tip is immersed, the collar portion 52 is ejected rearward so that the pen tip 41 is in the retracted state. It is configured.

As the elastomer constituting the sliding body 5, a general-purpose material having elasticity such as a thermoplastic elastomer or rubber can be applied. Specifically, the elastomer is composed of an elastomer having a Shore A hardness in the range of 70 to 95. By molding the sliding body 5 using the elastomer, the entire sliding body 5 becomes a buffer portion, so that it is possible to absorb the impact at the time of collision, and it can be stopped gently when the writing body is stored. 4 can be mitigated.
However, since the elastomer is more easily worn than hard resin, the sliding body 5 that rubs against the inside of the shaft cylinder during operation and contacts the inner surface of the other sliding body (such as a locking portion) may malfunction due to long-term use. There is a risk of causing problems such as. In addition, the material is not slippery and the appearance and operability may be deteriorated.
Therefore, by applying a coating 7 (DLC coating) with a diamond-like carbon film on at least the inner surface of the sliding body 5 (the portion that comes into contact with the shaft cylinder or another sliding body), the frictional property is maintained by maintaining the flexibility of the elastomer. Since deformation can be suppressed and lubricity can be imparted to the coating portion 7, the above-described problems can be solved. In the present embodiment, the coating portion 7 is formed only on the inner surface of the sliding body 5, but the operation portion 51 side (outer surface) and side surfaces can also be coated (see FIG. 2).

  As a method of applying the DLC coating (diamond-like carbon film forming method), a method of forming a film in a temperature range that does not cause thermal damage to a base material using a material that is relatively inferior in heat resistance such as an elastomer is used. Examples thereof include a CVD method, a sputtering method, and an ion plating method. In the present application, the coating portion 7 is formed by a plasma CVD method.

  The elastomer forming the sliding body 5 can be a thermoplastic elastomer or rubber having a Shore A hardness in the range of 70 to 95. Specifically, the thermoplastic elastomer may be an olefin, urethane, or styrene. , Polyester-based, polyamide-based, 1,2-polybutadiene-based, vinyl chloride-based, fluorine-based rubber and the like. Natural rubber, butyl rubber, ethylene propylene rubber, chloroprene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, acrylic rubber , Nitrile rubber, urethane rubber, silicon rubber, fluorine rubber and the like.

When writing with the multi-core writing instrument 1 having the above configuration, the pen point 41 of the connected writing body 4 is projected from the tip opening 24 by sliding the operation part 51 of the sliding body 5 forward. The locking portion (the convex portion on the inner surface of the sliding body) is locked by the locking protrusion formed in the shaft tube 2 and becomes writable. During the operation, the DLC coating portion 7 on the inner surface of the sliding body 5 contacts and rubs against the inside of the shaft cylinder (for example, a rib constituting the locking protrusion), but can be moved smoothly without causing wear or the like. it can.
When the pen tip 41 is housed, the other sliding body is slid forward, so that the locking portion of the previous sliding body 5 is disengaged from the locking projection, and the bullet that urges the sliding body 5 backward is provided. The sliding member 3 is pressed backward by the emitting member 6 and stored. At this time, the rear end of the sliding body abuts against the receiving portion (lid portion 3) of the shaft tube 2 and stops. At the time of the abutting, the return impact is absorbed by the elasticity of the sliding body 5 itself and the writing body 4 is absorbed. Can alleviate the effects.

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 21 Front shaft 22 Rear shaft 23 Window hole 24 Tip opening part 3 Lid part 4 Writing body 41 Pen tip 42 Ink receiving tube 43 Ink 44 Ink follower 5 Sliding body 51 Operation part 52 Gutter part 6 Spring member (coil spring)
7 Coating part

Claims (2)

  A plurality of writing bodies are accommodated by being urged rearward by a resilient member in a shaft cylinder having an opening at the front end, a sliding body is connected to the rear end of the writing body, and an operating portion on the outer surface of the sliding body is connected to the shaft cylinder. By projecting radially outward from a plurality of window holes provided on the outer peripheral surface of the rear, and sliding the operation unit forward, any one of the writing bodies is advanced to move the pen tip to the tip opening of the shaft cylinder. A multi-core writing instrument that further protrudes and retreats other writing bodies in an advanced position, wherein the sliding body is made of an elastomer having a Shore A hardness of 70 to 95, and at least an inner surface of the sliding body is provided with a DLC coating. A multi-core writing instrument.   The multi-core according to claim 1, further comprising an opening that is openable and closable at a rear side of the window hole, wherein the writing body and the sliding body can be taken out from the shaft tube and inserted into the shaft tube through the opening. Writing instrument.

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