JP5133552B2 - Intrusive compound writing instrument - Google Patents

Description

  The present invention relates to a retractable composite writing instrument in which a writing tip of a refill can be protruded from a front end, and more particularly to a technique for guiding the refill.

It is well known that a writing tip of a refill provided in a shaft cylinder is projected and retracted from a front end of a writing tool front end by a sliding pusher or a knock mechanism.
For example, as shown in Patent Document 1 by the present applicant, a multi-color writing tool (composite writing tool) that switches a plurality of colors of refills in and out by switching a pusher in the vicinity of the rear end of the shaft cylinder, As described above, there is a writing instrument in which a knock portion is provided in addition to the presser so that the lead operation of the refill for the mechanical pencil can be performed.

Thus, in the configuration where the writing tip of the refill appears and disappears, the refill collides with the inner peripheral surface of the tip when projecting the refill, or the inner peripheral surface of the front end and the shaft tube with the refill stored in the shaft tube May come into contact with the inner surface.
As a result, there is a problem that an unpleasant sound due to a collision or contact occurs, and there is a problem that the writing tip is damaged and the aesthetic appearance is deteriorated or a malfunction is caused.

As a related technique, in the technique disclosed in Patent Document 3, in the composite writing instrument in which the writing portion of the writing body is projected and retracted from the tip of the shaft tube, at least the front portion of the shaft tube is formed of metal, and the inner surface of the metal portion shaft tube It is proposed to form a resin layer.
As an effect of the present technology, even if the writing instrument is mistakenly dropped on the ground or the like, the pen tip of the ballpoint pen can be prevented from being crushed so that no ink leakage occurs.

If the resin layer is formed on the inner surface of the metal part shaft cylinder in this way, damage to the pen tip of the ballpoint pen can be prevented, which can be said to be a technique for removing the cause of the malfunction described above.
On the other hand, the retractable compound writing instrument is arranged with a relatively large margin in the shaft cylinder because the refill slides back and forth, and the contact sound when contacting the inner periphery of the shaft cylinder and other refills when the refill vibrates. There is also a problem that occurs.
In particular, writing instruments having high added value are required to prevent such contact sounds, but no effective method has been proposed.

  For example, Patent Document 4 discloses a configuration in which an O-ring is provided at the tip position as a technique for preventing the shake of the writing tip portion. It does not prevent the sound of an immersive refill from vibrating.

  Patent Document 5 discloses a technique for forming an irregularly shaped inner hole capable of guiding the front portion of the refill at the tip of the shaft cylinder of the retractable writing instrument. Further, Patent Document 6 has a configuration in which refill support convex portions whose inscribed diameters are slightly larger than the outer diameter of the refill are provided at a plurality of locations in the circumferential direction on the inner surface of the inner portion of the shaft tip opening through which the refill passes. It is disclosed.

The former is a technology that prevents rattling by supporting the front end of the refill, and solves the problem of difficult writing, while the latter makes the refill appear and disappear smoothly while making the gate mark less noticeable during injection molding. It is a technique to guide to.
In any of the above techniques, the writing instrument having only a single refill is a technique for preventing the writing tip from wobbling, but the refills collide with each other at the rear of the refill of the retractable composite writing instrument, or the refill and the shaft. It is impossible to prevent damage and collision noise caused by the collision of the cylinder inner periphery.

Japanese Patent No. 3168200 JP 2003-39888 JP 2001-63283 A Japanese Utility Model Publication No. 5-85683 JP 2002-36784 A Japanese Patent Laid-Open No. 10-236067

  The present invention was created in view of the above-described problems of the prior art, and in a retractable composite writing instrument in which a plurality of refills in a shaft tube are selected so that a writing tip portion can be protruded and retracted, the refill and the shaft tube It is an object of the present invention to provide a technique for preventing the inner circumference, damage due to collision between refills, and generation of collision sound.

In order to solve the above problems, the present invention uses the following means.
That is, the invention described in claim 1 is a retractable composite writing instrument comprising a plurality of refills in a shaft tube, and capable of projecting and retracting a writing tip portion of a refill selected from a tip attached to a front end of the shaft tube. Inside, a substantially cylindrical guide member configured integrally with the shaft cylinder or separately is provided, and each guide member connected to the guide member or the connecting member (hereinafter collectively referred to as the refill). referred to as. the insertion hole rear is inserted in), a slide piece which infested the refill along with and a sliding piece sliding portion which slides, Oite in front of the insertion hole, the inner peripheral surface of the guide member A plate-like convex portion is erected with the axial direction as the longitudinal direction, and the vicinity of the tip of the convex portion is guided so as to be in contact with the side surface of the rear portion of the refill. And

  The invention described in claim 2 is characterized in that, in the above-described retractable type composite writing instrument, the at least one of the refills is provided with a pair of convex portions for guiding the side surfaces of the refill from two different directions. .

Since the present invention is configured as described above, the following operational effects can be obtained.
According to the first aspect of the present invention, since the convex portion guides the rear portion of the refill, the refill is supported without obstructing the movement even if the writing tip portion approaches the axial center when each refill protrudes. Can do.
As a result, the refill vibrates, the refill and the inner periphery of the shaft cylinder, and the collision between the refills are suppressed, and the occurrence of damage and collision noise can be prevented.
In addition, since the convex portion protrudes inward from the guide member, it can be easily formed, can be easily manufactured while suppressing the number of components, and contributes to the reduction of manufacturing cost.

  Furthermore, since the convex portion is formed in a plate shape and can be brought into contact with the refill side surface in the vicinity of the tip, friction between the convex portion and the refill is reduced, thereby contributing to smooth sliding of the refill.

  According to the second aspect of the present invention, since the refill can be pinched from two directions, the vibration of the refill can be effectively guided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional plan view of a retractable composite writing instrument 1 (hereinafter simply referred to as a writing instrument) according to the present invention, and FIG. 2 is a front view thereof. The writing instrument 1 according to the present embodiment includes a front opening 10, a front shaft cylinder 11, a rear shaft cylinder 12, and a rear cap 13 that are assembled in order from the front end (writing section side) to form one writing instrument. A plurality of interior refills 20 and 30 are selectively projected and projected from the tip of 10.
A clip 14 is attached to the rear barrel 12.

In this embodiment, a mechanical pencil refill 20 and ballpoint pen refills 30 and 40 (not shown in FIGS. 1 and 2) are provided as refills. The ballpoint pen refills 30 and 40 are two-color refills having different colors. Since the ballpoint pen refills 30 and 40 have the same configuration, only the ballpoint pen refill 30 will be described below.
Further, in the practice of the present invention, about 2 to 5 refills can be installed in the shaft tube.

In the mechanical pencil refill 20, a mechanical pencil core 22 is fed out by a feeding mechanism 23 from a core insertion tube 21 which is a writing tip.
The feeding mechanism 23 biases the chuck (not shown) provided at the front end of the lead tank 24, a chuck ring (not shown) that slides in the axial direction on the outer periphery of the chuck, and the chuck and the lead tank 24 backward. A spring (not shown) or the like is provided.
Then, by pushing the rear cap 13 forward, as the rear shaft cylinder 12 slides with respect to the front shaft cylinder, the chuck is advanced and retracted, and the core 22 is fed forward.

The ballpoint pen refill 30 holds the transfer ball 32 rotatably at the tip of the tip 31 which is the writing tip, and the oil-based oil filled in the ink containing tube 33 by rotating the transfer ball 32 on the paper. Alternatively, aqueous ink is transferred to paper.
In the present application, the configuration of each refill is not limited to the above, and any known technique may be used arbitrarily, and other refills such as a marker refill may be provided.

The rear end of the mechanical pencil refill 20 is provided with a mechanical pencil slide piece 25 which becomes an engaging portion when the refill is projected and retracted. Similarly, the rear end of the ballpoint pen refill 30 is provided with a ballpoint pen slide piece 34. Yes.
Then, by rotating the rear shaft cylinder 12 with respect to the front shaft cylinder 11, the internal rotary cam 15 engages with the mechanical pencil slide piece 25 and the ballpoint pen slide piece 34 and protrudes forward respectively. , Configured to immerse backwards.

Such a rotary pay-out type writing instrument is also known, and for example, a configuration such as Patent Document 7 has been proposed by the present applicant.
In addition, by sliding a pusher provided at the rear part of the writing instrument as in Patent Document 2 back and forth, one of the plurality of refills is selected and made to appear, and the lead-out operation of the refill for the mechanical pencil is performed at the rear end of the shaft cylinder. The present invention can also be applied to a configuration that can be easily performed by the knocking operation.

JP 2001-71679

  In the retractable composite writing instrument 1, a detachable guide member 50 is disposed inside the front shaft cylinder 11 and the rear shaft cylinder 12, and guides the movement of each refill as it slides. The guide member 50 includes a tubular portion 51 having a front end opened at the front portion and an insertion hole provided with a hole through which each refill is inserted, as shown in a sectional view in FIG. 3 and a perspective view in FIG. Part 52, slide piece sliding part 53 in which slide pieces 25 and 34 slide at the rear part, and fitting part 54 to be fitted to the interior member in rear shaft cylinder 12 at the rear end.

3A to 3D are cross-sectional views of the guide member 50 taken along lines A to D in FIG. 3, respectively. The refill is not shown in FIG. 3, and the refill is shown in FIG.
First, the configuration of the refill will be described with reference to FIG. 6. The ballpoint refill 30 in this embodiment has a shorter overall length than the mechanical pencil refill 20, and a connecting member 35 is continuously provided at the rear part thereof. The front end of the connecting member 35 has a concave shape, and the refill 30 is fitted therein. The rear end of the connecting member 35 is connected to the slide piece 34.

  As described above, the connection member 35 can be used for the refill 30 in order to adjust the length or to facilitate the attachment / detachment at the time of replacement of the refill. In the present invention, the connection member 35 is used to include the connection member. .

  The tubular portion 51 of the guide member 50 has a substantially triangular cross section on the inner periphery, and the refills 20, 30, and 40 slide along the apexes when the refills are located at the apexes of the triangles. Stable operation is possible. (See Fig. 5 (A))

In front of the insertion hole 52, ribs 55a to 55d according to the present invention are provided on both sides of the apex of the triangle.
The rib portions 55a to 55d have thin plate-like projections projecting inward from the inner peripheral surface of the guide member 50, and are disposed only in the vicinity of the insertion hole portion 52 as shown in FIG. . (Refer to FIG. 5 (B))

The insertion hole 52 has a cross-sectional shape as shown in FIG. 5C, and refills are inserted into the holes 52a to 52c, which are insertion holes, so that each refill in the part hardly vibrates. It is supported stably.
Proceeding further backward, the slide piece sliding portion 53 is provided with groove portions 53a to 53c through which the refill and the slide piece slide. Each slide piece is located between the groove portion and the rear shaft cylinder 12 and the rotary cam 15. Slide. (Refer to FIG. 5 (D))

  Here, the structure of the rib portions 55a to 55d will be described in detail. The tip of the rib portion is rounded so that it can slide smoothly with the refill, and the tip is spaced from the side surface of the refill by a very small distance. When the refills vibrate, they are guided to prevent collision with the refills or the inner periphery of the guide member.

In addition, since each refill is guided obliquely from both sides, the refill can be shifted in the axial direction, and the movement of the refill at the time of appearing is not limited.
Further, in this embodiment, as will be described later, the mechanical pencil refill is provided with an O-ring 70 so that the mechanical pencil refill can buffer impacts with other ballpoint pen refills and the inner periphery of the shaft cylinder. It is configured. For this reason, as is apparent from FIG. 5B, ribs are not provided on both sides of the mechanical pencil refill 20. Even in such a configuration, since the ballpoint pen refill is reliably guided, the collision sound caused by each refill can be sufficiently suppressed.

  The rib portion can effectively guide each refill, but if the rib portion is slid with the refill over a long distance, the friction increases, and there is a possibility that sound is generated due to this friction or scratches occur. Further, when the refill is replaced, if the rib portion serving as a guide is too long, there is a problem that the replacement is difficult.

  Therefore, in the present invention, the rib portions 55a to 55d are disposed up to a position where the concave portion 35a (FIG. 6) at the tip of the connecting member 35 is detached from the rib portions 55a to 55d when the slide piece 34 moves forward. . As shown in FIG. 3, the front ends of the rib portions 55a to 55d are tapered so that the refill is guided smoothly.

  Here, as the total length of the rib portion, it is preferable that the rear half of the refill is guided even at the longest, and more preferably within a range of about 1/20 to 1/3 from the rear end of the full length of the refill as in this embodiment. Can be provided.

By the way, the reason why the rib portion is used in the present invention is that deformation is likely to occur when a large amount of resin is poured and molded. By using a plate-like rib portion as in this embodiment, it is difficult to deform and the amount of resin is small, so that the weight can also be suppressed.
However, in the case of using a material that does not easily deform, it is not necessary to use the rib portion as in the embodiments described later.

Next, another embodiment of the present invention will be described.
First, FIG. 7 shows a configuration example when there are two refills. FIG. 7A is a combination of the ballpoint pen refills 30 and 40 and the connecting member 35, and FIG. 7B is a mechanical pencil refill 20 and ballpoint pen. The case of the combination of the refill 30 is shown.
In the above embodiment, the configuration in which the rib portion is provided has been disclosed. However, as in this embodiment, the protrusion 60 is formed by projecting the inner periphery of the guide member 50 so as to sandwich the refill, and the refill vibrates. It may be prevented. In addition, as above-mentioned, it is preferable to provide this convex part only about the rear-end part vicinity of a refill.

7 (C) to 7 (D) show a configuration in which the rib portion (61) protrudes toward the side surfaces of the refills 20, 30, 40 and the connecting member 35, and FIG. 7 (E) only guides the refill for the ballpoint pen. An embodiment is shown.
Thus, when there are two refills, the rib portions may be formed in parallel.
Moreover, the structure which forms the rib part 62 only about the refill 30 for ball-point pens and the connection member 35 like FIG.7 (E) may be sufficient.

FIGS. 8A and 8B show a configuration using three refills.
In FIG. 8A, the refills 20, 30, 40 and the connecting member 35 are guided by raising the refills in a mountain shape.
FIG. 8B shows a configuration in which rib portions 64 are provided on both sides of the mechanical pencil refill 20 in the above-described embodiment. In the configuration in which the O-ring 70 described later is not provided, it is also preferable to form the rib portion 64 for the mechanical pencil refill 20 in this way.

FIGS. 9A to 9D show a configuration using four refills.
9A and 9B, the refills are raised in a mountain shape to guide the refills 20, 30, 40, 41, 42 and the connecting member 35.
9C and 9D, rib portions 66 provided on both sides of one refill guide the refill on the opposite side. As a result, four rib portions projecting toward the axial center are formed in the middle of each refill.

  As described above, the present invention is characterized in that the convex portion for guiding the vicinity of the rear portion of the refill is projected, and according to the present configuration, in the retractable composite writing instrument, the refill writing tip portion is displaced in the axial direction when protruding. It is possible to effectively prevent collision between the refills due to the vibration of the refills and collision with the inner periphery of the shaft tube.

By the way, although this invention may be comprised separately from a shaft cylinder like the said guide member 50, you may form directly in a shaft cylinder. For example, the convex portion according to the present invention may be formed by insert molding resin in the shaft cylinder.
In other words, the guide member according to the present invention can be provided in the retractable writing instrument integrally with the shaft tube, regardless of whether it is separate.

  As shown in FIG. 10, an annular recess 26 is formed in the outer periphery of the mechanical pencil refill 20, and a rubber O-ring 70 can be attached to the recess 26. Since the inner diameter of the O-ring 70 is smaller than the outer diameter of the mechanical pencil refill 20, the O-ring 70 is moved and fitted to the recess 26 in an expanded state, and is contracted after fitting so that it does not move back and forth.

The recess 26 is formed at a position where the mechanical pencil refill 20 protrudes and is in contact with the front end position of the tip 31 of the ballpoint pen refill 30. When the O-ring 70 abuts against the tip 31, the refill 20 · 30 is prevented from contacting directly.
Since the position is closest to the hole 10a of the tip 10 and hits the front end of the tip 31, the distance between the refills 20 and 30 is the shortest. By attaching the O-ring 70 to this part, the contact sound can be most effectively prevented.

Further, when the mechanical pencil refill 20 is immersed, the core insertion tube 21 is not supported by the tip 10 and thus is easily vibrated in the front shaft tube 11. Conventionally, the chuck 20 is gripped by a collision with the front shaft tube. In some cases, the core 22 is broken or the core insertion tube 21 is damaged.
By mounting the O-ring 70 as described above, the O-ring 70 cushions against the inner peripheral surface of the front shaft cylinder 11, which contributes to the prevention of these problems and collision noise.

The O-ring 70 is preferably attached to the mechanical pencil refill 20 where core breakage or the like is likely to occur. By attaching the O-ring 70 to the refill 20, the O-ring 70 contributes to mitigating impact of other refills 30.
However, it may be provided in other refills, and can be attached to all refills.

The plane sectional view of the intrusion type compound writing instrument concerning the present invention. Same as above, front view. Sectional drawing of the guide member which concerns on this invention. FIG. Sectional drawing of the guide member in this invention Example. Explanatory drawing which shows the structure of a refill. Sectional drawing of the guide member in the case of two refills. Sectional drawing of the guide member in the case of three refills. Sectional drawing of the guide member in the case of four refills. Explanatory drawing of the structure which provided the O-ring which concerns on this invention.

Explanation of symbols

25 Slide piece 34 Slide piece 50 Guide member 51 Tubular part 52 Insertion hole part 52a Hole part 52b Hole part 53 Slide piece sliding part 54 Fitting part 55b Rib part

Claims (2)

In the retractable type composite writing instrument comprising a plurality of refills in the shaft cylinder, and allowing the writing tip of the refill selected from the tip attached to the front end of the shaft cylinder to be able to appear and disappear,
In the shaft tube, provided with a substantially cylindrical guide member configured integrally with the shaft tube or separately.
Each guide or a connecting member (hereinafter collectively referred to as “refill”) that operates integrally with the refill is inserted into the guide member, and an insertion hole through which the rear portion of the guide member is inserted slides. A slide piece sliding portion, and
Oite in front of the insertion hole, the direction from the inner peripheral surface of the guide member inwardly, and erected a plate-like protruding portion in the axial direction as the longitudinal direction, near the tip portion of the convex portion is the refill rear An in / out type composite writing instrument characterized in that it is guided so as to be able to contact the side surface. In the haunting type composite writing instrument,
The at least one refill is provided with a pair of convex portions for guiding the side surface of the refill from two different directions. The retractable composite writing instrument according to claim 1.

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