JP5501928B2 - Materials for writing instruments - Google Patents

Description

The present invention relates to a writing instrument member. Specifically, the present invention relates to a cylindrical member for a writing instrument formed by connecting a rear end portion of a first cylindrical body and a front end portion of a second cylindrical body.

Conventionally, in this type of writing instrument member, Patent Document 1 discloses that a shaft main body is constituted by a front shaft and a rear shaft, which are engaged and fixed to each other, and an engagement hole is formed in the front shaft. Discloses a structure in which a plurality of legs are formed in front, an engagement protrusion is formed on the leg, and the engagement protrusion engages with the engagement hole.

Japanese Patent No. 3384187

In the conventional writing instrument member, the engagement between the engagement protrusion and the engagement hole is released due to a drop impact or bending, and the front shaft and the rear shaft may be separated.

The present invention solves the above-mentioned conventional problems, and can firmly connect the first cylinder and the second cylinder, so that the first cylinder and the second cylinder can be connected to each other even in a drop impact or bending. An object of the present invention is to provide a member for a writing instrument that is not likely to separate from a cylinder.

<1> The first invention of the present application is a cylindrical member for a writing instrument in which the rear end portion of the first cylindrical body 3 and the front end portion of the second cylindrical body 4 are connected to each other. A plurality of engaging recesses 32 are provided in a distributed manner in the circumferential direction on the inner surface of the rear end opening of the cylindrical body 3, and a plurality of engaging recesses 32 are provided on the front and rear sides. A plurality of leg pieces 42 having direction flexibility are provided, a plurality of engagement convex portions 42 a are provided on the front and rear sides of the leg piece 42 in the radial direction, and a plurality of engagement pieces provided on the front and rear sides of the leg piece 42 are provided. It is a requirement that the mating convex portion 42a and the plurality of engaging concave portions 32 provided at the front and rear sides of the rear end opening inner surface of the first cylindrical body 3 are engaged and fixed.

The writing instrument member 2 according to the first aspect of the present invention can firmly connect the first cylinder 3 and the second cylinder 4, and there is no risk of separation even when dropped or bent.

<2> According to a second invention of the present application, in the writing instrument member 2 of the first invention, a plurality of axially extending grooves 33 are provided on the inner surface of the rear end opening of the first cylindrical body 3, A requirement is that a plurality of engaging recesses 32 are provided in the front and rear of each groove 33.

The writing instrument member 2 of the second invention is provided with a plurality of axially extending grooves 33 on the inner surface of the rear end opening of the first cylindrical body 3, and a plurality of front and rear grooves are formed inside each of the grooves 33. By providing the engagement recess 32, the front and rear engagement protrusions 42a and the engagement recess 32 can be reliably engaged.

<3> A third invention of the present application is the writing instrument member 2 of the first or second invention, wherein the leg piece 42 is radially inward (axial direction) radially inward (axial side). It is a requirement that the rib 42b protruding in the axial direction and extending in the axial direction is integrally formed.

In the writing instrument member 2 according to the third aspect of the present invention, the leg piece 42 is formed in the radial direction by integrally forming a rib 42b protruding radially inward and extending in the axial direction on the radially inner surface of the leg piece 42. The first cylindrical body 3 and the second cylindrical body 4 can be firmly connected to each other by suppressing bending easily, and the first cylindrical body 3 and the second cylindrical body 4 can be connected to each other even in a drop impact or bending. There is no risk of separation.

<4> The fourth invention of the present application is that, in the writing instrument member 2 of the first, second, or third invention, of the plurality of engaging protrusions 42a provided at the front and rear, the rear engaging protrusions The radial distance L2 between the top of 42a and the axis of the second cylinder 4 is set so that the radial distance between the top of the front engaging projection 42a and the axis of the second cylinder 4 is The requirement is that the distance is smaller than the distance L1.

The writing instrument member 2 according to the fourth aspect of the present invention includes a plurality of engaging projections 42a provided at the front and rear, between the top of the rear engaging projection 42a and the axis of the second cylindrical body 4. By making the distance L2 in the radial direction smaller than the distance L1 in the radial direction between the top of the front engaging convex portion 42a and the axis of the second cylindrical body 4, the leg piece 42 is moved to the first cylinder. When inserted into the rear end opening of the body 3, the rear engaging convex portion 42a and the inner surface of the rear end opening of the first cylindrical body 3 are not pressed strongly in the radial direction, so that the leg piece 42 is smooth. Insertion is possible, and the front and rear engagement convex portions 42a can be reliably and easily engaged with the front and rear engagement concave portions 32.

If the distance L2 in the radial direction between the top of the rear engaging convex portion 42a and the axis of the second cylindrical body 4 is such that the top of the front engaging convex portion 42a and the second cylindrical body 4 When the leg piece 42 is larger than the distance L1 in the radial direction from the shaft center, when the leg piece 42 is inserted into the rear end opening of the first cylindrical body 3, the rear end side of the leg piece 42 that is difficult to bend and deform in the radial direction. The rear engaging convex portion 42a provided on the (base side) is more in pressure contact with the inner surface of the rear end opening of the first cylindrical body 3 and the engaging convex portion 42a on the front side in the radial direction. There is a risk of hindering smooth insertion of 42.

In the present invention, the cylindrical writing instrument member 2 includes, for example, various members used for writing instruments such as a shaft cylinder, a cap, an ink storage cylinder, a tail plug, a crown, and a grip.

The writing instrument member of the present invention can firmly connect the first cylindrical body and the second cylindrical body, and there is no possibility that the first cylindrical body and the second cylindrical body will be separated even by dropping impact or bending. .

It is a longitudinal cross-sectional view of embodiment of the multi-core writing instrument using the member for writing instruments of this invention. It is the sectional view on the AA line of FIG. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a perspective view of the 1st cylinder of FIG. It is a front view of the 1st cylinder of FIG. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is a principal part perspective view of the 2nd cylinder of FIG. It is a principal part perspective view of the 2nd cylinder of FIG. It is a principal part front view of the 2nd cylinder of FIG. It is CC sectional view taken on the line of FIG. It is a principal part longitudinal cross-sectional perspective view of the 2nd cylinder of FIG. It is a longitudinal cross-sectional view which shows the time of replacement | exchange of the cursive body of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG.

1 to 14 show a multi-core writing instrument using the writing instrument member according to the embodiment of the present invention.
The writing instrument member of the present embodiment is a shaft cylinder 2, and the shaft cylinder 2 includes a front shaft 3 (first cylinder) and a rear shaft 4 (second cylinder).

In the multi-core writing instrument 1, a plurality (specifically, five) of writing bodies 6 are accommodated in a shaft cylinder 2 so as to be movable in the front-rear direction. Each of the writing bodies 6 is urged rearward by each of the elastic bodies (specifically, compression coil springs). In the present embodiment, the number of the writing bodies 6 accommodated in the shaft tube 2 is five, but other than this, for example, two, three, four, and six may be used.

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

(Front shaft)
The front shaft 3 is obtained by a synthetic resin molded body or a metal processed body. A front end hole 31 is provided in the front end of the front shaft 3 in the front-rear direction. The outer surface of the front shaft 3 is provided with a grip portion made of an elastic material. On the inner surface of the rear end opening of the front shaft 3, a plurality of engaging recesses 32 are provided in a distributed manner in the circumferential direction. In the present embodiment, the engaging recess 32 is a hole that is penetrated in the radial direction (that is, a hole that opens radially outward). Also good. In the case where the engaging recess 32 is a hole penetrating in the radial direction, the engaging recess 32 can be easily obtained by resin molding or hole processing using a mold.

The engagement recesses 32 are provided in a distributed manner at a plurality of locations (for example, 3 locations) in the circumferential direction, and the engagement recesses 32 are provided at a plurality of locations in the front-rear direction. That is, at least another engagement recess 32 (for example, a hole penetrating in the radial direction) is formed in front or rear of each engagement recess 32 on the inner surface of the front shaft 3. In the present embodiment, the engagement recesses 32 are provided in a total of six places, three places in the circumferential direction and two places in the front and rear.

A plurality of grooves 33 extending in the front-rear direction are formed at equal intervals in the circumferential direction on the inner surface of the rear end opening of the front shaft 3. The engaging recess 32 is formed in each groove 33. That is, a plurality of (for example, two) engaging recesses 32 are arranged in the front and rear in each of the grooves 33.

(Rear axis)
The rear shaft 4 includes a cylindrical front member 4a and a rear member 4b connected to the rear end portion of the front member 4a. The rear shaft 4 (that is, the front member 4a and the rear member 4b) is obtained by a synthetic resin molded body or a metal processed body. A plurality of (for example, five) window holes 41 extending in the front-rear direction are provided in the side wall of the rear shaft 4 (that is, the rear member 4b) in the radial direction. A spring support portion 9 that supports the front end of the spring 8 is integrally formed on the inner wall of the rear shaft 4 (that is, the front member 4a). The spring support 9 has a plurality of inner holes 91 through which the respective writing bodies 6 slide. In the spring support portion 9, the front end of the spring 8 is supported directly or indirectly via another member.

A plurality of (for example, five) leg pieces 42 extending forward in the axial direction and having radial flexibility are integrally formed at the front end portion of the rear shaft 4 (that is, the front end portion of the front member 4a). The On the radially outer surface of the plurality of leg pieces 42, an engaging convex portion 42a is integrally formed. On the outer surface in the radial direction of the leg piece 42, the engaging projections 42a are arranged at a plurality of positions in the front-rear direction (for example, two positions in the front-rear direction). In the present embodiment, engagement convex portions 42 a are provided on the radially outer surfaces of the three leg pieces 42 among the five leg pieces 42.

The engaging convex portion 42a has an inclined surface on the front surface, and the rear surface is a surface perpendicular to the axis. Thereby, the smooth engagement attachment of the engagement convex part 42a and the engagement concave part 32 and the firm engagement state of the engagement convex part 42a and the engagement concave part 32 can be obtained.

Of the plurality of engagement protrusions 42a provided at the front and rear, the radial distance L2 between the top of the rear engagement protrusion 42a and the axis of the second cylinder 4 is the front engagement protrusion. It is set smaller than the distance L1 in the radial direction between the top of the portion 42a and the axis of the second cylindrical body 4. Thereby, when the leg piece 42 is inserted into the rear end opening of the first cylinder 3, the rear engaging projection 42 a and the inner surface of the rear end opening of the first cylinder 3 are strongly strong in the radial direction. The leg piece 42 can be smoothly inserted without being in pressure contact, and the front and rear engaging convex portions 42a can be reliably and easily engaged with the front and rear engaging concave portions 32.

On the radially inner surface (axial center side inner surface) of each leg piece 42, a rib 42b that protrudes radially inward (axial center direction) and extends in the axial direction is integrally formed.

The window holes 41 of the rear shaft 4 (rear member 4b) are arranged at equal intervals in the circumferential direction. A clip is provided on one side wall of the rear shaft 4 between the window holes 41.

(Connection of front shaft and rear shaft)
The leg pieces 42 are inserted into the rear end openings of the front shaft 3 along the grooves 33, and the engagement recesses 32 and the engagement protrusions 42a are engaged and fixed. Thereby, the front shaft 3 and the rear shaft 4 are connected to each other in the front-rear direction, and the shaft cylinder 2 is configured. When the plurality of writing bodies 6 are accommodated inside the shaft cylinder 2, the leg pieces 42 come into contact with the inner surface of the shaft cylinder 2 (the inner surface of the front shaft 3) between the writing bodies 6, and each rib 42b is arranged between the cursive bodies 6.

(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.

(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). The operation portions 71 of the respective operation bodies 7 are protruded radially outward from the respective window holes 41. By pressing the operation unit 71 forward, the pen tip 61 enters the protruding state, and the pen tip protruding state of the other writing body 6 is released.

(Cover)
As shown in FIG. 12, the rear end of each of the window holes 41 is formed with an opening 43 that opens in a notch shape behind the rear end of the shaft cylinder 2 (that is, the rear end of the rear shaft 4). At the rear end of the shaft cylinder 2, a lid portion 5 that allows the opening 43 to be opened and closed is provided. The writing instrument and the operating body 7 can be exchanged in a connected state through the opening 43 of the shaft tube 2. The lid portion 5 is rotatably attached to the hinge portion. A contact wall 51 is formed on the front surface of the lid 5. The rear end of each operation body 7 connected to the rear end of the immersed writing body 6 is brought into contact with the contact wall portion 51.

An engagement portion 52 (specifically, an engagement hole) is provided on the front surface of the lid portion 5, and an engaged portion that can engage with the engagement portion 52 is provided at the rear end of the rear shaft 4. 44 (specifically, an engaging protrusion) is provided. The engaging portion 52 and the engaged portion 44 are engaged with each other when the lid portion 5 closes the opening 43, and the operating body 7 and the lid portion 5 by the rearward biasing of the spring 8. In contact with the front contact wall 51, the engaged state is not released and the lid 5 is not opened.

(Spring support)
A spring support portion 9 is integrally formed on the inner wall of the rear shaft 4 (that is, the inner wall of the front member 4a). A plurality (specifically, five) of inner holes 91 through which the respective writing bodies 6 are inserted are penetrated in the spring support portion 9 in the axial direction. A spring 8 is disposed between the rear surface of the spring support portion 9 and each operation body 7. Each cursive body 6 is loosely inserted into each spring 8. The rear ends of the leg pieces 42 are integrally connected to the front surface of the spring support portion 9.

A cam member 10 is fixed on the rear surface of the spring support portion 9 between each operation body 7 and engageable with each operation body 7 in accordance with the pen-tip operation. The rear end portion of the cam member 10 includes a cam portion that can be displaced in the radial direction. In the present embodiment, the front end of each spring 8 is locked to the spring support portion 9, while the rear end of each spring 8 is locked to the operating body 7.

The multi-core writing instrument 1 according to the present embodiment is provided with a plurality of engaging recesses 32 distributed in the circumferential direction on the inner surface of the front shaft 3, extending forward in the axial direction at the front end portion of the rear shaft 4, and in the radial direction. A plurality of flexible leg pieces 42 are provided, an engagement convex portion 42a is provided on the radially outer surface of the plurality of leg pieces 42, and each leg piece 42 is opened at the rear end of the front shaft 3. The engagement recess 32 and the engagement projection 42a are engaged and fixed, and the respective leg pieces 42 are positioned between the writing bodies 6, thereby providing a front end hole 31. Since the connecting portion between the front shaft 3 and the rear shaft 4 provided with the spring support portion 9 is not thick, the outer diameter of the shaft tube 2 is increased even if the number of the writing bodies 6 accommodated in the shaft tube 2 is increased. As a result, it is possible to avoid inconvenience in carrying and deterioration in appearance.

In the writing instrument member 2 of the present embodiment, a plurality of engaging recesses 32 are provided on the inner surface of the rear end opening of the first cylindrical body 3 in a distributed manner in the circumferential direction, and a plurality of front and rear are provided. A plurality of leg pieces 42 extending forward in the axial direction and having radial flexibility are provided at the front end portion of the cylindrical body 4, and a plurality of engagement projections are provided on the radially outer surface of the plurality of leg pieces 42 in the front-rear direction. A plurality of engaging convex portions 42a provided on the front and rear sides of the leg piece 42 and a plurality of engaging concave portions 32 provided on the inner surface of the rear end opening of the first cylindrical body 3; By fixing together, the 1st cylinder 3 and the 2nd cylinder 4 can be connected firmly, and there is no possibility that it may isolate | separate by dropping impact, bending, etc.

In the writing instrument member 2 according to the present embodiment, a plurality of axially extending grooves 33 are provided on the inner surface of the rear end opening of the first cylinder 3, and a plurality of front and rear engagements are provided in each of the grooves 33. By providing the joint recess 32, the plurality of front and rear engaging projections 42a and the engaging recess 32 can be reliably engaged.

In the writing instrument member 2 of the present embodiment, the leg piece 42 is easily formed in the radial direction by integrally forming a rib 42b protruding inward in the radial direction and extending in the axial direction on the radially inner surface of the leg piece 42. The first cylindrical body 3 and the second cylindrical body 4 can be firmly connected, and the first cylindrical body 3 and the second cylindrical body 4 are separated even in a drop impact or bending. There is no fear.

1 Multi-core writing instrument 2 Shaft tube (member for writing instruments)
3 Front shaft (first cylinder)
31 Front end hole 32 Engaging recess 33 Groove 4 Rear shaft (second cylinder)
41 Window hole 42 Leg piece 42a Engagement convex part 42b Rib 43 Opening part 44 Engagement part 4a Front member 4b Rear member 5 Lid part 51 Contact wall part 52 Engagement part 6 Writing body 61 Pen point (ball-point pen tip)
62 Ink receiving tube 7 Operating body 71 Operating portion 8 Spring 9 Spring support portion 91 Inner hole 10 Cam member

Claims (4)

A cylindrical writing instrument member formed by connecting a rear end portion of a first cylindrical body and a front end portion of a second cylindrical body, and is engaged with an inner surface of a rear end opening of the first cylindrical body. A plurality of concave portions are provided in a distributed manner in the circumferential direction and a plurality of front and rear portions are provided, and a plurality of leg pieces extending in the axial direction forward and having radial flexibility are provided at the front end portion of the second cylindrical body, A plurality of engaging protrusions are provided on the front and rear sides of the leg piece in the radial direction, a plurality of engaging protrusions provided on the front and back of the leg piece, and the inner surface of the rear end opening of the first cylindrical body A member for a writing instrument, wherein a plurality of provided engaging recesses are engaged and fixed. The writing instrument member according to claim 1, wherein a plurality of axially extending grooves are provided in an inner surface of a rear end opening of the first cylindrical body, and a plurality of engaging recesses are provided in the front and rear of each of the grooves. . The member for a writing instrument according to claim 1 or 2, wherein a rib projecting inward in the radial direction and extending in the axial direction is integrally formed on a radially inner surface of the leg piece. Among the plurality of engaging protrusions provided at the front and rear, the radial distance between the top of the rear engaging protrusion and the axis of the second cylindrical body is the top of the front engaging protrusion. The member for writing instruments in any one of Claim 1 thru | or 3 made smaller than the distance of the radial direction between the shaft center of a 2nd cylinder.

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