JP7244899B2 - writing instrument - Google Patents

Description

The present invention relates to writing instruments.

Conventionally, retractable writing instruments are widely known in which a writing body such as a ballpoint pen refill or a unit with a core feeding mechanism (so-called mechanical pencil unit) is arranged in a barrel, and the tip of the writing body is retracted from the tip of the barrel. there is In this type of retractable writing instrument, the tip of the writing body can be placed outside the barrel when writing, while the tip of the writing can be stored inside the barrel when not in use.

As such a retractable writing instrument, there is a multi-core writing instrument having a plurality of writing bodies. This multi-core writing instrument is used by selecting one writing body from a plurality of writing bodies and arranging the tip portion of the selected writing body outside the barrel, like a so-called multicolor ballpoint pen. In other words, the structure is such that tip portions of a plurality of writing bodies are selectively projected and retracted from one opening provided at the tip of the barrel.

As this type of multicore writing instrument, there is one disclosed in Patent Document 1, for example.
The writing instrument disclosed in Patent Document 1 has a structure including a perforated member arranged in a barrel and three types of refills (writing bodies) of different colors.

More specifically, a perforated member is arranged in the middle of the barrel of this writing instrument in the axial direction. The perforated member has a plurality of through holes, each of which extends axially through the perforated member. That is, a space on the tip side (pen tip side) and a space on the rear side in the barrel are separated by the perforated member, and the through holes of the perforated member communicate the two spaces. Each refill is inserted through a different through hole.

Further, the rear end portion of the refill is attached to an operating means (slider), and the refill is axially moved by operating the operating means.
An urging means is provided between the perforated member located on the tip side and the operation means located on the tail side, and the urging means constantly urges the operation means and the refill toward the tail side. It is in a state of

Therefore, after the operation means is moved toward the pen point against the biasing force of the biasing means, the operation means is engaged with another member, thereby keeping the operation means at the post-movement position. As a result, the distal end side of the refill connected to the operating means protrudes outside from the distal end of the barrel.
On the other hand, when the tip side of the refill is accommodated in the barrel, the engagement between the operating means and the other member is released. As a result, the operating means and the refill are moved rearward by the biasing force of the biasing means, and the leading end of the refill retracts into the barrel.

Japanese Patent No. 5395637

Here, in a multi-core writing instrument, when the ink of one of the refills is used up, the refill may be replaced with a new refill. However, conventional multi-core writing instruments have room for improvement in terms of facilitating the replacement of refills.

Specifically, when exchanging the refill 202 of the multi-color ballpoint pen (multi-core writing instrument), as shown in FIG. The side tube portion 203 is separated. As a result, a plurality of refills 202 protrude from the front opening 203a of the rear cylinder 203 to the outside. Then, from this state, the refill 202a to be replaced is pulled out toward the pen tip side (front side), and the refill 202a is removed.

That is, when removing the refill 202a, as shown in FIG. 16(a), the target refill 202a is moved forward (to the left in FIG. 16). At this time, since each refill 202 is integrally attached to the front portion of the slider 204 (operating means), when a predetermined refill 202a is moved forward, the slider 204a connected to this refill 202a moves forward. .

By further pulling the refill 202a forward while the slider 204a has moved to the front end side within the movement range, the refill 202a is removed from the front end portion of the slider 204a as shown in FIG. 16(b). state. After that, the slider 204a is returned to the position before movement (see FIG. 16(c)), and the removal of the refill 202a is completed.

By the way, a coil spring 206 (biasing member) is attached to the front end side of the slider 204a together with the refill 202a. Most of the coil spring 206 is located between the slider 204a and the perforated member 205 and is always compressed. When the refill 202a is to be removed, the refill 202a once shrinks greatly (see FIG. 16(b)), and then shifts to a state where the amount of shrinkage is small (see FIG. 16(c)).
As a result, when the refill 202a is removed as described above, the coil spring 206 may meander from its original posture as shown in FIGS. 16(c) and 17. FIG.

That is, the coil spring 206 is originally arranged in a posture extending along the axial direction of the multicolor ballpoint pen 201 (see FIG. 16A and the like).
However, when meandering occurs, as shown in FIG. 17, an imaginary line L1 connecting the centers of the wound portions meanders with respect to the axial direction of the multicolor ballpoint pen 201 (horizontal direction in FIG. 17). It becomes extended. That is, the imaginary line L1, which should be straight (or extends substantially straight), extends to one side in the radial direction (lower side in FIG. 17) and then to the opposite side in the radial direction (upper side in FIG. 17). As it extends, it extends in a meandering manner.

If the coil spring 206 meanders in this way, it becomes difficult to attach a new refill 202b.

That is, when attaching a new refill 202b, as shown in FIG. 18, the rear end side portion of the refill 202b is inserted from the front opening 203a, and then the through hole 205a of the perforated member 205 is inserted at a recessed position. insert into Then, as shown in FIG. 19, the rear end portion (the right end portion in FIG. 19) of the refill 202b is moved from the inside of the through hole 205a of the perforated member 205 to the inside of the coil spring 206. Then, as shown in FIG.

Here, when the coil spring 206 meanders as described above, when the rear end portion of the refill 202b is moved inside the coil spring 206, the rear end portion of the refill 202b is caught by the wire of the coil spring 206. There is
That is, as shown in FIG. 19(b), the rear end corner portion of the refill 202b may come into contact with the wire rod of the coil spring 206, preventing the refill 202b from moving smoothly rearward.

In such a case, if the refill 202b is forcibly pushed in, the meandering of the coil spring 206 becomes greater, and the meandering coil spring 206 is entwined with another nearby coil spring 206 (see FIG. 16(c), etc.). A problem arises.
This problem is particularly conspicuous in a writing instrument having a thin barrel with a small diameter. That is, a writing instrument with a thin shaft has a narrow space in its barrel, and a plurality of coil springs 206 are arranged in this narrow space. For this reason, the coil springs 206 are inevitably brought close to each other, causing such a problem.
Furthermore, in a writing instrument with a thin shaft, such a problem may occur even if the meandering is small. ) can cause this kind of problem.

That is, when installing a new refill 202b, it is necessary to insert the refill 202b into the inside of the coil spring 206 and further push the refill 202b into contact with the front end of the slider 204a. However, when the coil spring 206 meanders as described above, it becomes very difficult to pass the refill 202b through the inside of the coil spring 206 .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a writing utensil that facilitates replacement work of writing bodies.

The invention according to claim 1 for solving the above problems is a writing instrument comprising a barrel, a writing body, and an urging member, wherein deformation of the urging member is regulated so that the writing body and the urging member It has an auxiliary member for regulating the contact of the members, the auxiliary member is arranged inside the biasing member, a part of the writing body is arranged inside the auxiliary member , and it moves in the axial direction of the barrel. The writing utensil is characterized in that it has a slider member to which the writing body and the auxiliary member are attached to the slider member .

The writing instrument of the present invention includes the biasing member that biases the predetermined member, and the auxiliary member can prevent unintended deformation of the biasing member. That is, it is possible to prevent the occurrence of the above-described meandering deformation and the like. In addition, it is possible to prevent problems caused by contact between the writing body and the urging member when exchanging the writing body. This makes it easy to replace the writing material.

The present invention has a slider member that moves in the axial direction of the barrel, and the writing body and the auxiliary member are attached to the slider member .

With such a configuration, the auxiliary member can be arranged in the shaft cylinder without requiring large-scale processing or the like.

According to a second aspect of the present invention, there is provided a writing instrument comprising a barrel, a writing body, and a biasing member. a member, wherein the auxiliary member is arranged inside the biasing member, a part of the writing body is arranged inside the auxiliary member, a guide member is arranged inside the barrel, and the guide member has a communication portion that communicates a space on the front end side and a space on the rear side in the barrel, the writing body is inserted through the communication portion, and the auxiliary member is arranged along the axis of the barrel along with the writing body. The writing instrument is characterized in that, when the auxiliary member is positioned on the rearmost side, the distal end of the auxiliary member is positioned inside the communicating portion. .

This configuration is preferable because the auxiliary member is less likely to be damaged when exchanging the writing material. In addition, it is easy to insert the writing body inside the auxiliary member, and the work of exchanging the writing body can be facilitated.

The invention according to claim 3 is the writing instrument according to claim 1 or 2, characterized in that a tapered portion that narrows toward the tail side is provided at the tail side portion of the writing body. .

According to such a configuration, the writing body can be easily inserted into the auxiliary member, and the writing body replacement operation can be facilitated.

In the writing instrument described above, it is preferable that the auxiliary member moves in the axial direction of the barrel together with the writing body.

The writing instrument described above has a slider member that moves in the axial direction of the barrel, and a part of the slider member is exposed to the outside of the barrel. It is preferable to be able to move the body.

The above-described writing instrument has a guide member inside the barrel, the guide member has a communicating portion that communicates a space on the front end side and a space on the rear side in the barrel, and the communicating portion includes the A writing body is inserted through the auxiliary member, and the auxiliary member moves along with the writing body in the axial direction of the barrel. When the auxiliary member is positioned on the rear side, the distal end of the auxiliary member It is preferable that each of the distal end side openings of the communicating portion be positioned on substantially the same plane.
It should be noted that the term "approximately" in "substantially on the same plane" as used herein allows for a difference in level of about plus or minus 2.0 mm.

In the writing instrument described above, the auxiliary member is a cylindrical body having an opening formed at the tip side portion, and the tip side portion of the auxiliary member is formed with a thickened portion that widens toward the tip side. is preferred.

The above-described writing instrument has a guide member inside the barrel, the guide member has a communicating portion that communicates a space on the front end side and a space on the rear side in the barrel, and the auxiliary member: It is preferable that the writing member moves in the axial direction of the barrel, and that at least a part thereof is always located inside the communicating portion.

In the above-described writing instrument, the auxiliary member moves in the axial direction of the barrel along with the writing body, and the biasing member is a spring that expands and contracts as the auxiliary member moves. is preferred.

In the above-described writing implement, it is preferable that the writing body can be removed by pulling it out toward the front end side and can be attached by pushing it toward the rear end side.

In the writing instrument described above, it is preferable that the urging member is a coil spring, the compression direction is the same as the axial direction of the barrel, and the maximum length of the extension is shorter than that of the auxiliary member.

In the writing instrument described above, it is preferable that the biasing member generates a biasing force that directly or indirectly biases the writing body.

ADVANTAGE OF THE INVENTION According to this invention, the writing implement which exchange work of a writing body is easy can be provided.

1 is a perspective view showing a multicore writing instrument according to an embodiment of the present invention; FIG. FIG. 2 is a perspective view showing the multicore writing instrument of FIG. 1, showing a state in which the front side tubular portion and the rear side tubular portion are separated; FIG. 3 is an explanatory view showing the rear tubular portion of FIG. 2 and its interior, showing only one of the plurality of connecting structures through the rear tubular portion; FIG. 4 is a perspective view showing the connecting structure of FIG. 3; FIG. 5 is an exploded perspective view showing the connecting structure of FIG. 4; FIG. 6 is a perspective view showing the slider member of FIG. 5; FIG. 2 is a cross-sectional view showing the multicore writing instrument of FIG. 1, showing a state in which one ballpoint pen tip is protruded to the outside; It is explanatory drawing which shows the rear side cylinder part of FIG. 2, and its inside, and fracture|ruptures a part of rear side cylinder part and connection structure, and shows inside typically. (a) is an explanatory view showing the main part of the A part of FIG. 8, and (b) is an explanatory view showing the main part of the B part of FIG. FIG. 10 is an explanatory view showing how the core member is attached to the slider member, and a view showing the main part inside the rear cylinder, showing how the core member is moved in the order of (a) to (c). It is explanatory drawing which shows the principal part of the internal structure of the multi-core type writing instrument concerning embodiment different from above-described embodiment, (a), (b) shows each different embodiment. FIG. 4 is an explanatory diagram showing the main part of the internal structure of a multicore writing instrument according to an embodiment different from each of the above-described embodiments; FIG. 4 is an exploded perspective view showing a connecting structure according to an embodiment different from the above-described embodiments; FIG. 14 is an explanatory diagram showing the main part of the internal structure of a multicore writing instrument that employs the connection structure of FIG. 13; It is a diagram showing how to replace the refill of the conventional multicolor ballpoint pen, and is an explanatory diagram showing how to remove the refill by removing the front side cylinder part, showing a part of the inside of the rear side cylinder part in a see-through manner. FIG. 15 is a diagram showing how the refill is removed following FIG. 15, and is an explanatory diagram showing the rear cylindrical portion and the perforated member cut away, and is removed in the order of (a) to (c). It is a figure which shows the coil spring shown by FIG.16(c), (a) is a side view, (b) is an end view which cuts and shows the coil spring of (a). It is explanatory drawing which shows a mode that a new refill is attached following FIG.16(c). It is explanatory drawing which shows a mode that a new refill is attached following FIG. 18, and inserts a refill into a coil spring in order of (a) and (b).

Hereinafter, a multi-core writing instrument 1 (writing instrument) according to an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these examples.
In the following description, unless otherwise specified, the pen tip side will be referred to as the tip side or front side, and the opposite longitudinal side to the pen tip side will be referred to as the tail side or rear side.

As shown in FIGS. 1 and 2, the multi-core writing instrument 1 of the present embodiment includes a shaft tube 2 serving as a main body, a plurality of core members 3 (cursive, see FIG. 2), and a plurality of slider members 4. (predetermined member).
The multi-core writing instrument 1 has a structure in which the leading end portion of the core member 3 protrudes outside from the leading end opening 2a of the barrel 2 by moving any one of the slider members 4 toward the pen tip. (more on that later).

That is, as shown in FIG. 3, the core member 3, the coil spring 6 (biasing member), the insertion assisting member 7 (assisting member), and the slider member 4 are integrated inside the multicore writing instrument 1. A plurality of connecting structures 8 are arranged (four in the present embodiment, and only one is shown in FIG. 3). Therefore, when any one slider member 4 is moved toward the pen tip side, one core member 3 connected to the slider member 4 moves toward the pen tip side.

As shown in FIGS. 1 and 2, the shaft tube 2 is composed of a front side tube portion 10 and a rear side tube portion 11. As shown in FIGS.
Note that the multicore writing instrument 1 of the present embodiment is a writing instrument with a thin shaft in which the barrel 2 is formed thin (a so-called writing instrument of the thin shaft type). That is, it is a writing instrument in which the shaft diameter (the maximum diameter of the shaft diameter and the maximum length in the direction parallel to the cross section) of the barrel 2 is 13.7 mm or less. In this embodiment, the axial diameter of the barrel 2 is formed to be 12 mm or less.
Here, the inner diameter of the shaft cylinder 2 (the maximum diameter of the inner diameter and the maximum length in the direction parallel to the cross section) is formed to be about 2 mm smaller than the shaft diameter. That is, in this embodiment, the inner diameter of the barrel 2 is formed to be 10 mm or less. It should be noted that the "degree" here includes an error of several percent.

As shown in FIG. 2, the front side tube portion 10 has a tube tip portion 13 formed on the tip side portion, and a male screw portion 14 formed on the outer peripheral surface of the tail side portion.
The front tubular portion 10 is a hollow member, and the inside and the outside are in communication via the tip opening 2a and the rear opening (not shown) on the tail side. In addition, the rear opening is an opening having a diameter larger than that of the tip opening 2a.

The tip end portion 13 has a tapered portion whose outer and inner side surfaces (see FIG. 7) become narrower toward the tip end, and has a tip end opening 2a that communicates the inside and outside of the front side tube portion 10 with the tip end face. is formed.

As shown in FIG. 2, the rear tubular portion 11 is a substantially bottomed tubular member having a front opening 11a on the distal end side, and is a hollow member having a space formed therein.
The rear cylindrical portion 11 has a female screw portion 17 formed on the inner peripheral surface of the tip portion thereof, and a slider groove 20 formed on the outer peripheral surface of the rear portion thereof. The female threaded portion 17 is a portion that can be screwed with the male threaded portion 14 of the front tubular portion 10 . That is, the male threaded portion 14 and the female threaded portion 17 form a pair of engaging portions, and the female threaded portion 17 is one of them.

The slider groove 20 is a groove elongated along the axial direction (longitudinal direction) of the rear cylinder portion 11 (shaft cylinder 2), and penetrates the side wall portion of the rear cylinder portion 11 to communicate the internal space with the outside. . A plurality of slider grooves 20 are formed, and are arranged in parallel at intervals in the circumferential direction of the rear cylindrical portion 11 .

As described above, the shaft tube 2 is a member formed by screwing (engaging) the male threaded portion 14 and the female threaded portion 17 to connect the front side tubular portion 10 and the rear side tubular portion 11 . In a state in which the front tubular portion 10 and the rear tubular portion 11 are connected, the internal space of the front tubular portion 10 and the internal space of the rear tubular portion 11 form a series of spaces, and are connected to the outside through the tip opening 2a. communicate.

Here, as shown in FIG. 3, a multi-core guide member 25 (guide member) is arranged inside the shaft tube 2 (rear side tube portion 11).

The multi-core guide member 25 is a member having a substantially cylindrical shape. That is, it has a shape extending in a predetermined direction with a width, and the widening direction of the cross section of the barrel 2 is defined as the width direction, and the axial direction (front-rear direction) of the barrel 2 is defined as the extending direction.
The multi-core guide member 25 is provided with a plurality of guide through-holes 25a (communicating portions). Each guide through-hole 25 a penetrates the multi-core guide member 25 in the axial direction of the barrel 2 .

As described above, the multi-core guide member 25 is a member that divides the internal space of the rear tubular portion 11 (shaft tube 2), and more specifically, divides the internal space into a distal space and a rearward space. The two partitioned spaces are connected through the guide through hole 25a.

The guide through-holes 25a are formed in the same number as the connecting structure 8 (core member 3), and four are formed in this embodiment. A portion of a different connecting structure 8 is inserted through each of the plurality of guide through holes 25a (only one connecting structure 8 is shown in FIG. 3).
Specifically, the core member 3 and the insertion assisting member 7 are inserted through the guide through hole 25a of the present embodiment. That is, a portion of the connecting structure 8 including at least the core member 3 is inserted through the guide through hole 25a.

The multi-core guide member 25 functions as a guide member that regulates the movement direction when the connecting structure 8 moves (details will be described later), and also allows the plurality of connecting structures 8 (core members 3) to approach each other. It also functions as a spacer member that regulates the arrangement position so as not to over tighten.

The core member 3 is a ball-point pen refill in this embodiment, and as shown in FIG. 4, has a structure including a ball-point pen tip 3a and an ink container 3b.

The ball-point pen tip 3a has a structure to rotatably hold an internal metal ball, and the rotation of the ball applies the ink supplied from the ink container 3b to an external writing object (paper, etc.). do. In other words, the ball-point pen tip 3a forms a pen tip portion (writing portion) that is located on the tip side of the core member 3 and performs writing on the object to be written.

The ink containing cylinder 3b is a tubular member having a substantially cylindrical shape. That is, in a shape extending in a predetermined direction with a width, in a state in which the tip end does not protrude from the barrel 2, the width direction is the widening direction of the cross section of the barrel 2, and the axial direction of the barrel 2 is the extension direction. Become. Ink of a predetermined color is accommodated in the internal space. Here, an opening plug (not shown) is provided in the internal space of the ink containing cylinder 3b at a position slightly away from the trailing end toward the leading end. That is, the internal space is divided into two spaces by this opening plug, and ink is stored in the space on the tip side.
The space on the rear end side communicates between the inside and the outside through an opening (not shown) located on the rear end side (rear end surface) of the ink containing cylinder 3b. ). That is, a substantially bottomed hole-like portion is formed between the rear end of the entire ink containing cylinder 3b and the rear end of the opening plug.

As a characteristic part of the ink containing cylinder 3b of this embodiment, as shown in FIG. 5, a tapered portion 30 (tapered portion) is formed on the trailing portion of the outer peripheral surface. The tapered portion 30 is a portion that narrows so as to have a narrower diameter toward the trailing side (that narrows so that the maximum width direction length becomes shorter), and is a portion that has a substantially truncated cone shape.
In other words, the tapered portion 30 has a shape in which the trailing corner portion of a cylinder is removed along the circumferential direction. Then, it is formed between a portion that is a little more distal than the trailing end and the trailing end.

As shown in FIG. 6, the slider member 4 is a member extending in an elongated shape, and includes a slider body portion 35, an operation projection portion 36, a movement restricting portion 37, an engaging projection portion 38, and a member mounting portion. 39 are integrally formed.

The slider body portion 35 is a member that has a substantially rectangular parallelepiped shape and extends in the front-rear direction. At the front end portion of the slider main body portion 35, a tip side widened portion 35a having a longer widthwise length than the others is formed.

The operation protrusion 36 is a portion that protrudes outward (upward in FIG. 6) from the outer surface (upper surface in FIG. 6) of the slider main body 35, and protrudes from a portion of the outer surface near the rear end. The projecting end portion has a rounded shape.

The movement restricting portions 37 are protruding portions that protrude outward from side portions located on both sides in the width direction of the slider main body portion 35, and are formed on each of the two side portions (one is not shown). . The movement restricting portion 37 has a substantially rectangular parallelepiped shape, and protrudes outward from a part of the side surface portion of the slider main body portion 35 from the rear end to the lower side.
In this embodiment, the movement restricting portions 37 of the same shape are formed at positions separated in the width direction (one is not shown), and the front and rear end portions of the two movement restricting portions 37 are positioned in the longitudinal direction. are at the same position (substantially the same position).

The engaging protrusion 38 is a portion that protrudes inward (downward in FIG. 6) from the inner surface (lower surface in FIG. 6) of the slider body portion 35 and extends in the front-rear direction. The engagement protrusion 38 has different protrusion amounts in the front-rear direction, and is integrally formed of a relatively large protrusion 38a and a relatively small small protrusion 38b.

The member mounting portion 39 is a portion formed at the front end portion of the slider main body portion 35, and is a portion formed integrally with the base end projection portion 45 on the rear tail side and the tip end projection portion 46 on the tip end side. .

The proximal protrusion 45 is formed by integrally forming two columnar portions having different diameters, and serves as a protrusion extending stepwise. That is, the large projection 45a on the tail side and the small projection 45b on the tip side are integrally formed.
The large protrusion 45a is a portion with a relatively long diameter (relatively thick), and protrudes forward from the front end of the slider main body 35 (from the tip to the pen point side). Specifically, it is a large-diameter columnar portion that has a substantially circular cross-sectional shape and extends in the front-rear direction.
The small protrusion 45b has a relatively short diameter (relatively thin thickness) and protrudes further forward from the front end surface of the large protrusion 45a. The small protrusion 45b is a small-diameter columnar portion extending in the front-rear direction and having substantially the same cross-sectional shape (substantially circular shape) as the large protrusion 45a.

Here, the central axis of the large protrusion 45a and the small protrusion 45b are formed to be the same central axis. That is, the entire side surface (peripheral surface) of the large protrusion 45a and the entire side surface (peripheral surface) of the small protrusion 45b are continuous via a step.
The large projecting portion 45a is a portion (to which the coil spring 6 is fitted) that is inserted inside the coil spring 6 when the coil spring 6 is attached (see FIGS. 4 and 5). That is, it functions as an urging member mounting portion for mounting the coil spring 6 .
The small projecting portion 45b is a portion that is inserted inside the insertion assisting member 7 (to fit the insertion assisting member 7) when the insertion assisting member 7 is attached (see FIGS. 4 and 5). That is, it functions as an auxiliary member mounting portion for mounting the insertion auxiliary member 7 .

The tip protrusion 46 is a flat plate-shaped protrusion that protrudes forward from the front end surface of the base end protrusion 45 (small protrusion 45b). Specifically, a substantially rectangular plate-like portion extending in the front-rear direction on the tail side and a substantially triangular plate-like portion positioned on the tip side thereof are integrally formed.
In other words, the widthwise length of the tip side portion of the tip protrusion 46 decreases from the trailing side toward the tip side. In addition, in this substantially triangular plate-like portion, the corner portion on the tail side has a rounded shape.

As shown in FIG. 5, the coil spring 6 has an end turn portion 6a formed at both ends in the longitudinal direction. One end turn portion 6a is a portion that is fitted onto the small projection portion 45b of the slider member 4 during assembly, and the other end turn portion 6a is a portion that contacts the rear end portion of the multi-core guide member 25. (Refer to FIG. 3, etc., which will be described later in detail).

The insertion assisting member 7 is a tubular member (pipe-shaped member) made of resin and having a substantially cylindrical shape. That is, it has a shape extending in a predetermined direction with a width, and the widening direction of the cross section of the barrel 2 is defined as the width direction, and the axial direction (front-rear direction) of the barrel 2 is defined as the extending direction. The insertion assisting member 7 is a flexible hollow member having openings at the front and rear ends in the longitudinal direction, and a space extending in the longitudinal direction (front-rear direction) is formed therein.

Next, the assembly structure of the multi-core writing instrument 1 and the retracting movement of the core member 3 will be described.

First, as described above, the connecting structure 8 is assembled and arranged inside the barrel 2 .
As shown in FIGS. 4 and 5, the connecting structure 8 has the end turn portion 6a of the coil spring 6 fitted onto the large protrusion 45a (see FIG. 5) of the slider member 4, and the small protrusion 45b (see FIG. 5). 5), the longitudinal ends of the insertion assisting member 7 are fitted. Further, the core member 3 is fitted onto the tip protrusion 46 of the slider member 4 , in other words, the tip protrusion 46 (see FIG. 5) is inserted into the rear end portion of the core member 3 .
In other words, the connecting structure 8 has the coil spring 6, the insertion assisting member 7, and the core member 3 attached to the slider member 4, and these are integrated.

In addition, when the insertion assisting member 7 is attached to the slider member 4 , the insertion assisting member 7 is in a state in which the opening portion on the rear end side is closed by the base end protrusion 45 . Further, the opening portion of the core member 3 on the rear end side is closed by the front end surface of the small protrusion 45b.

Therefore, in the connecting structure 8, as shown in FIG. 4, most of the insertion assisting member 7 is inserted inside the coil spring 6, and the rear end portion of the core member 3 is inserted into the inner space of the insertion assisting member 7. be done. That is, the insertion assisting member 7 is arranged so as to surround the outer side of the core member 3 in the portion of the connecting structure 8 where the rear end side of the core member 3 is located.
In this way, by adopting a structure in which the insertion assisting member 7 is interposed between the core member 3 and the coil spring 6, contact between the core member 3 and the coil spring 6 is prevented.

Here, the inner diameter (coil inner diameter) of the coil spring 6 is formed to have the same length as the outer diameter of the insertion assisting member 7 or a length slightly larger than the outer diameter of the insertion assisting member 7 . The term “finely large” as used herein means a size in which the difference in diameter (diameter) is 1.0 mm or less, more preferably 0.5 mm or less, and still more preferably 0 .2 mm or less. This also applies to the following description.
As a result, the outer peripheral surface of the insertion assisting member 7 is in contact with the inner portion of the coil spring 6 or in a state in which a fine gap is formed with the inner portion of the coil spring 6 .

The inner diameter (coil inner diameter) of the coil spring 6 of the present embodiment is slightly longer than the outer diameter of the insertion assisting member 7, and the difference between these diameters is 0.2 mm or less (detailed illustration is omitted). ). Therefore, when the slider member 4 is positioned on the rearmost side and the coil spring 6 extends in the axial direction of the barrel 2 without meandering, the inner portion of the coil spring 6 and the outer peripheral surface of the insertion assisting member 7 A gap of 0.1 mm or less is formed between them.
In this way, according to the structure in which they are loosely fitted with a gap between them, the expansion and contraction of the coil spring 6 accompanying the movement of the slider member 4 (details will be described later) can be made smoother than in the structure in which the slider member 4 is tightly fitted.

In addition, the inner diameter of the insertion assisting member 7 is formed so as to have the same length as the outer diameter of the core member 3 (the maximum diameter of the ink container 3b) or a length slightly larger than the outer diameter of the core member 3. are doing.
Therefore, inside the insertion assisting member 7, the outer peripheral surface of most of the core member 3 (the portion other than the tapered portion 30) and the inner peripheral surface of the insertion assisting member 7 are in contact with each other, or there is a gap therebetween. A fine gap is formed in the

In the present embodiment, the inner diameter of the insertion assisting member 7 is slightly longer than the outer diameter of the core member 3, and the difference between these diameters is 0.2 mm or less (detailed illustration is omitted). . Therefore, there is a gap of 0.1 mm or less between the majority of the portion of the core member 3 inserted into the insertion assisting member 7 (the portion excluding the tapered portion 30) and the inner peripheral surface of the insertion assisting member 7. It is formed.
In this way, according to the structure in which a gap is provided between them and they are loosely fitted, insertion/removal of the core member 3 into/from the insertion assisting member 7 (removal/insertion at the time of replacement of the core member 3) is more difficult than in the structure in which the core member 3 is tightly fitted. (details will be described later) can be performed smoothly.

Furthermore, in a state where the connecting structure 8 is arranged inside the barrel 2, as shown in FIG. 6 is placed. In other words, the tip side portion of the coil spring 6 is in contact with the rear end portion of the multi-core guide member 25 . The portion of the multi-core guide member 25 with which the coil spring 6 abuts is the portion adjacent to the rear opening of the guide through-hole 25a (detailed illustration is omitted).

Further, the coil spring 6 is compressed even when the slider member 4 belonging to the same connecting structure 8 is positioned on the rearmost side, that is, when the front end widened portion 35a adjacent to the rear end side portion is positioned on the rearmost side. It is arranged so that it is in a state where it is
In other words, the coil spring 6 is a compression spring arranged in a state of being always compressed inside the rear side tubular portion 11 (shaft tube 2). In other words, the coil spring 6 constantly generates an urging force that urges the slider member 4 rearward.

Here, as described above, the core member 3 and the insertion assisting member 7 are integrally attached to the slider member 4 . That is, the coil spring 6 urges the core member 3 and the insertion assisting member 7 toward the tail side via the slider member 4 . In other words, the coil spring 6 indirectly biases the core member 3 through another member.

Further, in a state in which the connecting structure 8 is arranged inside the barrel 2 , the operating protrusion 36 of the slider member 4 is inserted into the slider groove 20 . The movement restricting portion 37 is fitted into a groove portion (not shown) formed inside the barrel 2 and extending in the front-rear direction. Therefore, the slider member 4 is structured to be slidable along the axial direction (front-rear direction) of the barrel 2 without being displaced in the radial direction of the barrel 2 (direction crossing the axial direction).

Then, when the slider member 4 is moved toward the pen tip side against the urging force of the coil spring 6 from the state where the slider member 4 is positioned at the rearmost side in the movable range (the state shown in FIG. 3, etc.), the coil spring 6 is greatly shrunk (see the enlarged portion of FIG. 7, etc.). At the same time, together with the slider member 4, the core member 3 and the insertion assisting member 7 move toward the pen tip (see FIG. 7, etc.). As a result, the tip side portion (ballpoint pen tip 3a) of the core member 3 protrudes outside from the tip opening 2a.

At this time, since the inner diameter of the coil spring 6 and the outer diameter of the insertion assisting member 7 are the same (substantially the same), the coil spring 6 is compressed while being in contact with the insertion assisting member 7 . In addition, since the inner diameter of the insertion assisting member 7 and the outer diameter of the core member 3 are the same (substantially the same), the rear end portion of the core member 3 maintains contact with the inner surface of the insertion assisting member 7. while moving to the pen tip side (forward) together with the insertion assisting member 7 .

Although not shown in detail, the slider member 4 that has moved to the pen point side engages with a portion (not shown) inside the barrel 2, and is prevented from moving to the rear side. That is, the slider member 4 is always urged rearward by the coil spring 6, but is prevented from moving rearward by this urging force.

When any one of the slider members 4 is moved toward the pen tip side, when the other slider member 4 is moved toward the pen tip side, the slider member 4 on the pen tip side and a part of the barrel 2 (not shown) are moved toward the pen tip side. ) is disengaged. Specifically, the engagement protrusion 38 of the other slider member 4 presses the engagement protrusion 38 of the slider member 4 on the pen tip side from the tail side, thereby changing the posture of the slider member 4 on the pen tip side. and disengage.

In other words, in the multi-core writing instrument 1 of the present embodiment, by performing an operation to move any one of the slider members 4 toward the pen tip side, the tip side portion (ballpoint pen tip 3a) of the core member 3 becomes the tip opening 2a. protrude outward from
Further, in this state, by performing an operation to move the other slider member 4 toward the pen tip side, the tip side portion of the core member 3 protruding outside retracts into the barrel 2 .
As described above, the multi-core writing instrument 1 of the present embodiment selects one of the plurality of core members 3 and retracts the leading end portion of the selected core member 3 into and out of the barrel 2. Operation is possible.

Next, a procedure for exchanging the core member 3 in the multi-core writing instrument 1 will be described.

When exchanging the core member 3, the front tubular portion 10 and the rear tubular portion 11 are separated from each other as shown in FIG. Then, among the plurality of core members 3 exposed to the outside, one core member 3 to be replaced is pulled forward.

As a result, as shown in FIG. 8, as the core member 3 moves forward, the coil spring 6 is greatly compressed, and the insertion assisting member 7 and the slider member 4 move forward. That is, similarly to when the core member 3 protrudes outside the barrel 2, the coil spring 6 is further compressed, and the insertion assisting member 7 and the slider member 4 are positioned at the extreme tip side of the movable range.
By further pulling the core member 3 forward in this state, the core member 3 is removed from the slider member 4 . When the core member 3 is removed, the core member 3 slides while maintaining the state in which the outer peripheral surface of the rear end side portion is in contact with the inner peripheral surface of the insertion assisting member 7 . moves forward (toward the pen tip). Then, the rear end portion of the core member 3 moves forward from the internal space of the insertion assisting member 7, and the core member 3 is removed.

After that, the slider member 4 to which the core member 3 is attached is moved to the tail side, and the removal of the core member 3 is completed.

Here, in the present embodiment, the insertion assisting member 7 is positioned inside the coil spring 6 as described above. Specifically, in the state where the slider member 4 is positioned at the extreme tip side of the movable range and the state where it is positioned at the rearmost side of the movable range, the inside of the end turn portion 6a on the front side (the left side in FIG. 8) of the coil spring 6 , and the insertion assisting member 7 is positioned inside the portion between the two end turn portions 6a.
As a result, when the slider member 4 is moved rearward after the core member 3 is removed, it is possible to prevent the coil spring 6 from being elongated while meandering. That is, even if the coil spring 6 attempts to deform, the deformation is prevented by contact with the insertion assisting member 7 on the inner side. In other words, the insertion assisting member 7 functions as a regulating member that regulates the posture change of the coil spring 6 .

Further, when the slider member 4 to be connected is positioned at the rearmost end of the movable range, the front end portion of the insertion assisting member 7 extends inside the guide through hole 25a (in the internal space from the front end opening to the rear end opening). up to). Specifically, the front end portion of the insertion assisting member 7 is arranged at the same position in the front-rear direction as the front end portion (front end opening) of the guide through hole 25a (see FIGS. 8 and 9A). ). That is, the front end face of the insertion assisting member 7 is positioned on the same plane (substantially on the same plane) as the front opening of the guide through-hole 25a, and faces the front side portion of the multi-core guide member 25, which is the peripheral portion of the front opening. become one (substantially flush).

On the other hand, when the connected slider member 4 is positioned closest to the pen tip side of the movable range, the front end portion of the insertion assisting member 7 is positioned closer to the pen tip side than the front end portion of the guide through hole 25a ( 8 and 9(b)). That is, the front end side portion (pen tip side portion) of the insertion assisting member 7 protrudes forward from the guide through hole 25a.

Returning to the description of the replacement work of the core member 3, after removing the core member 3, as shown in FIG. insert.
Here, as described above, the core member 3 is formed with the tapered portion 30 at the trailing portion thereof. In addition, as described above, when the core member 3 is inserted, the front end surface of the insertion assisting member 7 and the front end opening of the guide through hole 25a are located on the same plane (substantially on the same plane). For these reasons, the work of inserting the core member 3 is facilitated.

That is, when inserting the core member 3 , it is necessary to align the rear portion of the core member 3 with the inner hole of the insertion assisting member 7 . At this time, even if the core member 3 is slightly displaced from the inner hole of the insertion assisting member 7 in the radial direction of the shaft cylinder 2 (for example, the vertical direction in FIG. 10), the taper portion 30 is formed, so that the core member 3 is pushed in as it is. The rear end side portion of the core member 3 is inserted into the inner hole of the insertion assisting member 7 only by pressing.
Further, in a state where the front end portion of the insertion assisting member 7 protrudes forward from the guide through hole 25a, if the core member 3 comes into contact with the insertion assisting member 7 while being displaced in the radial direction of the barrel 2, There is a possibility that the insertion assisting member 7 will bend. However, in the present embodiment, as described above, when the core member 3 is inserted, the insertion assisting member 7 does not protrude from the guide through hole 25a, so such bending of the insertion assisting member 7 can be prevented. Furthermore, even if the rear portion of the core member 3 is displaced in the radial direction of the shaft tube 2 and contacts the front portion of the multi-core guide member 25, the alignment can be performed by finely adjusting the position. is easy.

Then, as shown in FIGS. 10(a) to 10(c), the trailing portion of the core member 3 is inserted into the inner hole (inner hole) of the insertion assisting member 7, and further pushed to the trailing side.
At this time, since the insertion assisting member 7 functions as a guide for the core member 3, the core member 3 can be inserted straight. Further, since the insertion assisting member 7 is positioned between the core member 3 and the coil spring 6, contact between the core member 3 and the coil spring 6 can be prevented.
Then, the rear end portion of the core member 3 (ink containing cylinder 3b) is pressed against the front end portion of the slider member 4, and the leading end projection is formed inside from the rear opening (not shown) of the core member 3 (ink containing cylinder 3b). Assume that the portion 46 is inserted. This completes the replacement of the core member 3 .

In the above-described embodiment, as shown in FIG. 7, when the insertion assisting member 7 is positioned at the rearmost position, the front end portion of the insertion assisting member 7 is on the same plane (substantially on the same plane) as the front opening of the guide through hole 25a. An example located in the top) is shown (see FIG. 9(a)). That is, an example is shown in which the front end portion of the insertion assisting member 7 moves between the position where the front opening of the guide through hole 25a is formed and the position forward of the guide through hole 25a. However, the present invention is not limited to this.

For example, as shown in FIG. 11(a), the front end portion (the portion indicated by the reference symbol P) of the insertion assisting member 107 (assisting member) is positioned between the front opening and the rear opening of the guide through hole 25a. , and a position forward of the guide through hole 25a.
That is, it may be configured to move between a position deep inside the guide through hole 25a and a position forward of the guide through hole 25a.

Further, as shown in FIG. 11(b), the front end portion (portion indicated by symbol P) of the insertion assisting member 108 (assisting member) is located between the front opening and the rear opening of the guide through hole 25a. , and the position where the front opening of the guide through-hole 25a is formed.
That is, it may be configured to move from a deep position inside the guide through-hole 25a to a position where the front-side opening of the guide through-hole 25a and the front-rear direction are the same. In other words, a structure in which the front end portion of the insertion assisting member 108 is always positioned inside the guide through-hole 25a may be employed.

When the insertion assisting members 7, 107, 108 are positioned on the rearmost side, the insertion assisting members 7, 107, 108 can be moved smoothly by locating the front end portion on the front side of the rear opening of the guide through hole 25a. It is preferable to move to That is, it is possible to prevent the insertion assisting members 7, 107, and 108 from unexpectedly detaching from the guide through hole 25a, which is preferable.

In addition, as shown in FIG. 12, the front end portion (the portion indicated by the reference symbol P) of the insertion assisting member 109 (assisting member) is located between a position forward of the guide through hole 25a and a position further forward. It is good also as a structure which moves between. In other words, the front end portion of the insertion assisting member 108 may always be positioned forward of the guide through hole 25a.
However, from the viewpoint of facilitating the insertion of the core member 3 and preventing damage to the auxiliary member, the front end portion of the auxiliary member located at the rearmost side forms the front opening of the guide through hole 25a. It is preferably positioned at or behind it.

Here, in the present embodiment, as shown in FIG. 7, when the tip side portion of the core member 3 is protruded outside from the tip opening 2a, the core member 3 is bent and extended.
That is, when the tip side portion of the core member 3 moves from the rear side to the front side along the axial direction of the barrel 2 and comes into contact with the inner peripheral surface of the tip portion 13 of the tube, it then moves to the inner periphery of the tip portion 13 of the tube. It moves along the surface toward the tip opening 2a. By going through this process, the core member 3 assumes a posture in which a part of the core member 3 gently bends and extends.

12, the maximum projection length of the insertion assisting member 109 from the guide through hole 25a does not hinder the bending of the core member 3 when the tip portion is positioned outside the barrel 2. It should be the length. In other words, when the insertion assisting member 109 is positioned at the frontmost position, the length of projection from the guide through-hole 25a needs to be a length that does not hinder the bending of the core member 3 .

In the embodiment described above, an example in which the inner diameter of the insertion assisting member 7 is constant from the front end to the rear end was shown, but the present invention is not limited to this.
For example, as shown in FIG. 13, an insertion assisting member 110 (assisting member) having an enlarged diameter tapered portion 130 at the front portion may be employed.

The insertion assisting member 110 has an enlarged diameter tapered portion 130 formed between the front end portion and a portion slightly rearwardly away from the front end. The enlarged diameter taper portion 130 is a portion whose radial length increases toward the front end side, and each of the inner peripheral surface and the outer peripheral surface is a portion that increases in diameter toward the front end side. That is, it is a portion having a substantially conical shape.

When this insertion assisting member 110 is employed, as shown in FIG. 14, the guide through hole 125a (communicating portion) of the multi-core guide member 125 (guide member) also has a guide side tapered portion 131 at the front end side portion. may be formed. The guide-side tapered portion 131 is a portion whose inner peripheral surface increases in diameter toward the front end side, and is a portion into which the enlarged diameter tapered portion 130 of the insertion assisting member 110 is substantially just fitted.
Then, when the slider member 4 is positioned on the rearmost side, the expanded diameter tapered portion 130 is positioned inside the guide side tapered portion 131 and fitted therein, and the front end side portion of the insertion assisting member 110 extends through the guide through hole 125a. may be formed so as to be flush with the front opening of the .
With such a configuration, the work of inserting the core member 3 becomes easier.

In the above-described embodiment, an example of the tubular insertion assisting member 7 communicating with the outside at the front end and the rear end in the longitudinal direction is shown. However, the present invention is not limited to this.
For example, the auxiliary member may have a hole or a groove portion formed in the side wall portion of the cylinder for communicating the internal space with the outside. It suffices if the deformation of the coil spring 6 can be restricted and the contact between the core member 3 and the coil spring 6 can be prevented.
That is, in the above-described embodiment, a part of the core member 3 located inside the coil spring 6 is surrounded by the insertion assisting member 7 over the entire circumferential direction from the front end to the rear end. However, it does not necessarily have to have such a structure. However, the above structure is preferable from the viewpoint of more reliably preventing contact between the core member 3 and the coil spring 6 and more reliably preventing unintended deformation of the coil spring 6 .

In the embodiment described above, an example in which the coil spring 6 is externally fitted to a part of the slider member 4 and attached integrally is shown. However, the present invention is not limited to this.
The urging member of the present invention does not necessarily have to be integrally attached to the slider member 4, and is positioned between the multi-core guide member 25 and a portion of the slider member 4 to be pressed (for example, the tip side widened portion 35a). and a structure that biases the slider member 4 may be used.

In the above-described embodiment, an example in which a ballpoint pen refill is used as the core member 3 was shown, but the present invention is not limited to this.
The core member may be a mechanical pencil unit. In other words, a pen tip unit forming a pen tip portion (writing part) on the tip side and a lead storage cylinder for accommodating the lead of a mechanical pencil on the rear end side may be integrally formed. The pen tip unit is provided with a lead feed mechanism for feeding the lead of the mechanical pencil, and has a structure that interlocks with a predetermined operating member. For example, a structure may be adopted in which the lead of the mechanical pencil is sent out by knocking the slider forward multiple times (lightly pushing it toward the pen tip).

The multi-core guide member 25 described above may be formed integrally with the rear tubular portion 11 (shaft barrel 2), or may be separately formed and attached inside the rear tubular portion 11 (shaft barrel 2). When they are formed separately, for example, grooves may be provided on the outer peripheral surface of the multi-core guide member, and projections may be provided on the inner peripheral surface of the rear cylindrical portion 11 to engage them. The groove and the protrusion may be paired engaging portions, and it is sufficient that one and the other of the paired engaging portions are formed on each of the multi-core guide member and the rear tubular portion 11 .
Further, in the above-described embodiment, an example in which the guide through-holes 25a are formed in the cylindrical multi-core guide member 25 was shown, but the guide member and the communicating portion are not limited to this. For example, the general shape of the guide member may be a plate-like one, or may be formed including a plate-like one and a cylindrical one. Further, the communicating portion may be a notched groove other than the through hole. In other words, the communication portion may be connected to the outside at the front and rear ends, as well as at the side portions.

In the embodiment described above, an example of the multi-core writing instrument 1 with a thin shaft was shown, but the present invention is not limited to this.
For example, the writing instrument of the present invention is not limited to the thin shaft type, and may be a writing instrument having a barrel with a shaft diameter larger than 13.7 mm. In such a multicore writing instrument as well, it is preferable that the inner diameter of the barrel is smaller than the shaft diameter by about 2 mm.
Moreover, the writing instrument of the present invention is not limited to the multi-core writing instrument 1 having a plurality of core members 3, and may be a single-core writing instrument having one core member. The single core type writing instrument may be a thin single core type writing instrument (so-called thin type writing instrument) having a shaft diameter of 10.9 mm or less (preferably 10 mm or less). A single core type writing instrument having a shaft diameter larger than 10.9 mm may be used. Also in a single core type writing instrument, it is preferable to form the inner diameter of the barrel about 2 mm smaller than the shaft diameter.

In the above-described embodiment, the slider member 4 that is slidable in the front-rear direction is provided, and when the user slides the slider member 4, the refill (core member) slides along with the slider member 4 (side slide type). An example of a writing instrument (multicolor ballpoint pen) of formula) is shown. However, the writing instrument of the present invention is not limited to this. For example, it may be a knock type writing instrument such as a side knock type or a rear end side knock type.

Here, the knock-type writing instrument is a writing instrument in which the core member is protruded and retracted by knocking (pressing) an operation member (such as a knock bar) protruding from the barrel. That is, in the side-knock type, the operating member protrudes from the side wall portion of the barrel, and in the rear-end-side knock type, the operating member protrudes outside from the tail-side end portion of the barrel. This type of writing instrument has a structure in which an operation member to be pressed and a slider that moves in the front-rear direction are interlocked to press the core member toward the pen tip.
That is, in such a structure, an auxiliary member may be arranged outside the core member, and an urging member may be arranged on the outside thereof to urge the slider or a cam connected thereto.

Also, the present invention may be a rotary writing instrument.
Here, the rotary writing instrument is to rotate a part of the writing instrument relative to the other part (for example, rotate a part of the barrel relative to the other part of the barrel). , a writing instrument that moves the core member forward and backward. This type of writing instrument has a structure in which a slider that moves in the front-rear direction inside moves back and forth according to a rotating operation. That is, in such a structure, an auxiliary member may be arranged outside the core member, and an urging member may be arranged further outside the auxiliary member to urge the slider or a cam connected thereto by the urging member. .

1 multi-core writing instrument (writing instrument)
2 shaft tube 3 core member (cursive)
4 slider member 6 coil spring (biasing member)
7, 107, 108, 109, 110 Insertion auxiliary member (auxiliary member)
25, 125 Multi-core guide member (guide member)
25, 125a Guide through hole (communication part)
30 taper part (tapered part)

Claims (3)

In a writing instrument comprising a barrel, a writing body, and a biasing member,
an auxiliary member that regulates deformation of the biasing member and regulates contact between the writing body and the biasing member;
The auxiliary member is arranged inside the biasing member, and a part of the writing body is arranged inside the auxiliary member ,
Having a slider member that moves in the axial direction of the barrel,
A writing instrument , wherein the writing body and the auxiliary member are attached to the slider member . In a writing instrument comprising a barrel, a writing body, and a biasing member,
an auxiliary member that regulates deformation of the biasing member and regulates contact between the writing body and the biasing member;
The auxiliary member is arranged inside the biasing member, and a part of the writing body is arranged inside the auxiliary member,
Having a guide member inside the barrel,
The guide member has a communication portion that communicates a space on the front end side and a space on the rear side in the barrel, and the writing body is inserted through the communication portion,
The auxiliary member moves in the axial direction of the shaft cylinder together with the writing body,
A writing utensil according to claim 1, characterized in that when the auxiliary member is positioned on the rearmost side, the distal end of the auxiliary member is positioned inside the communicating portion. 3. The writing instrument according to claim 1 , wherein the trailing part of the writing body is provided with a tapered portion that tapers toward the trailing side.

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