JP5249554B2 - Intrusive compound writing instrument - Google Patents

Description

  The present invention relates to a retractable composite writing instrument in which writing tips of a plurality of refills can be selectively protruded and retracted, and particularly relates to a technique in which refills operate smoothly and silently.

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 part is provided in addition to the presser so that the lead operation of the refill for the mechanical pencil can be performed.

Since the composite writing instrument has about 2 to 5 refills built in, the refills may collide in the shaft tube, or the refill and the shaft tube may collide with each other. May occur.
In particular, in the case of a high-grade writing instrument using a metal shaft tube, when the metal refill and the shaft tube collide with each other, an unpleasant sound that the metal rubs is generated, which needs to be prevented.

  In addition, when a strong collision occurs in the shaft cylinder, the mechanical pencil refill may cause a core breakage. Therefore, it is desirable not only to prevent the generation of sound but also to reduce the impact caused by the collision.

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.
Thus, if the resin layer is formed on the inner surface of the metal part shaft cylinder, damage to the tip of the ballpoint pen can be prevented, and this can be said to be a technique for removing the cause of the malfunction.

  By the way, in the present technology, the shaft cylinder itself is made of metal, and a resin layer is formed in the entire metal portion shaft cylinder. In the configuration in which the shaft tube is formed integrally with the tip as disclosed in this document, it is not so difficult to form the resin layer in the shaft tube.

On the other hand, a writing instrument is also known in which the front end and the shaft tube are configured separately, and the front end is attached to the shaft tube for assembly, and by adopting such a configuration, the aesthetics of the appearance is improved and the manufacturing process is simplified. This contributes to the improvement of maintenance and refill maintenance.
However, in such a writing instrument, the technique in which the tip and the shaft cylinder disclosed in Patent Document 3 are integrally formed cannot be applied as they are, and a plurality of problems remain.
That is, Patent Document 3 has a structure in which a resin layer is formed at the same time on the front end and the shaft cylinder which are integral, but when the front end and the shaft cylinder are formed separately, the resin layer is not formed after assembly. In addition, if the resin layer is formed, the front end and the shaft tube are fixed, and the front end cannot be separated from the shaft tube.

In the case of a retractable composite writing instrument, the above-described collision sound is particularly likely to occur because there is room in the shaft cylinder. In particular, a high-grade writing instrument with high added value is required to prevent such a collision sound, but an effective method has not 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, but this contributes to prevention of the shake of the tip, but is immersive in the retractable composite writing instrument. It does not realize the prevention of sound when the refill is vibrated.

Japanese Patent No. 3168200 JP 2003-39888 JP 2001-63283 A Japanese Utility Model Publication No. 5-85683

  The present invention was created in view of the above-described problems of the prior art, and prevents the refill from colliding with the inner periphery of the shaft cylinder or between the refills in the shaft cylinder of the retractable composite writing instrument, thereby suppressing the collision sound. In addition, an object of the present invention is to provide a technology that suppresses the breakage of the sharp core and realizes a smooth appearance operation of the refill.

In order to solve the above problems, the present invention uses the following means.
The present invention is applied to a retractable composite writing instrument that includes a plurality of refills in a shaft cylinder and that allows the writing tip portion of the refill selected from the front end attached to the front end of the shaft cylinder to be retractable. According to the first aspect of the present invention, a large number of soft protrusions projecting in the axial direction of the shaft tube are provided at positions corresponding to the refill side surface of the inner peripheral surface of the shaft tube .
A structure including about 2 to 5 refills is well known in the intrusive composite writing instrument, and may include a refill for mechanical pencils.

  The tip of the soft projection is substantially point-like. That is, it is desirable that the tip of the soft protrusion and the refill be in point contact or a line contact with a sufficiently short length.

The invention described in claim 2 is characterized in that the interval between the soft protrusions is an interval at which two or more soft protrusions can simultaneously contact at least one of the refills. Specifically, although depending on the diameter of the shaft tube and the refill and the height of the soft protrusion, for example, in a writing instrument having a standard thickness, about 10 to 20 soft protrusions can be provided. The soft protrusion may be composed of a large number of hairs in a brush shape.

The invention described in claim 3 is characterized in that the soft protrusions are constituted by rib-like bodies arranged in the axial direction of the cylinder. In this case, a rib-like body that is as thin as possible in the axial direction and has a length of 1 mm to 5 mm can be used.

A fourth aspect of the present invention is the above-described retractable composite writing instrument, wherein a circular tube-shaped position adjusting tube disposed in the shaft cylinder , and a circle whose position is regulated by the position adjusting tube and a soft protrusion is provided on the inner surface. An annular base material is provided.

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, by providing the soft protrusion at the position corresponding to the refill side surface, when the refill vibrates, it interferes with the tip of the soft protrusion and can suppress the vibration. In addition, by providing a large number of protrusions, the soft protrusions can easily suppress the direction in which the plurality of refills vibrate.

According to the second aspect of the present invention, since the soft protrusions are provided at intervals at which the refill can contact two or more soft protrusions, the refill may enter between the soft protrusions and directly collide with the inner peripheral surface of the shaft cylinder. Absent.
Moreover, even if it is a soft protrusion of a soft material by contacting with two or more soft protrusions, the vibration of the refill can be suppressed with sufficient strength.

  According to the third aspect of the present invention, the contact area is small by making the tip of the soft protrusion substantially point-like, and the refill and the soft protrusion can be prevented from interfering except during vibration. In particular, in a retractable composite writing instrument, the refill slides at the time of retracting, so it is desirable that the refill does not normally contact the soft protrusions, but should be kept to a minimum even if temporarily contacted.

  According to the fourth aspect of the present invention, since the soft protrusion is composed of the axial rib-like body, there is no great friction even if the refill slides back and forth. Further, the rib-like body makes it easy to ensure sufficient strength, and production is easy.

According to the fifth aspect of the present invention, the soft protrusion can be arranged at an optimal position by providing the position adjusting tube. In particular, it is preferable that the soft protrusion is provided at a site that does not interfere with the unevenness of the refill in the locus where the refill slides.
Furthermore, since the position adjusting tube is made of resin or the like, the inner peripheral surface of the shaft cylinder can be covered, so that the impact sound between the refill and the inner peripheral surface of the shaft cylinder can be used instead of the resin coating described in the prior art. Can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front sectional 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 refills 20, 30, 40, and 41 (not shown in FIGS. 1 and 2) 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 three ballpoint pen refills 30, 40, and 41 are provided as refills. The ballpoint pen refills 30, 40, and 41 have different colors. Since the ballpoint pen refills 30, 40, and 41 have the same configuration, only the ballpoint pen refill 30 will be described below.

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.
The configuration of each refill is not limited to the above, and any known technique can 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 5 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. A configuration that can be easily performed by the knocking operation is also well known.

Japanese Patent Laid-Open No. 2001-71679

FIG. 3 shows a cross-sectional view taken along line AA of the retractable composite writing instrument 1. In the cross-sectional view, a guide member 50 is disposed inside the rear barrel 12 and guides its movement when each refill slides. As shown in FIG. 4, the guide member 50, the tubular portion 51 of the front end to the front is open, the insertion hole portion 52 with a hole provided by each refill is inserted substantially in the center, the slide piece 25, 34 to the rear Has a sliding piece sliding portion 53 that slides, and a fitting portion 54 that fits the cam in the rear shaft cylinder 12 at the rear end.
As shown in FIG. 3, the refills 20, 30, 40, 41 or connecting members connected to the rear ends thereof slide in the insertion holes 52 a to 52 d in the insertion hole portion 52.

FIG. 5 is a cross-sectional view showing details in the front barrel according to the present invention.
In the writing instrument 1, the tip 10 is attached to the front shaft cylinder 11. It should be noted that the front shaft cylinder 11 and the rear shaft cylinder 12 may be configured as a single cylinder instead of being separated.
The front end 10 is located substantially in the vicinity of the front end of the retractable composite writing instrument and has a substantially conical shape, and a hole 10a is formed at the tip which is the apex for the writing tip to protrude. The diameter of the hole 10a is slightly larger than the diameter of the writing tip, and can be smoothly projected and retracted, and the writing tip is supported by the hole 10a during writing so that writing is easy.

A screw groove is formed on the outer periphery 10c of the rear end portion of the front opening 10, and a screw groove is also formed on the inner periphery of the attachment portion 11a of the front shaft cylinder 11. Is attached.
The mounting mode is not limited to the case of screwing, and it may be a configuration in which the front end is simply fitted into the shaft tube, or either the concave portion or the convex portion is provided on the front end or the shaft tube. Alternatively, the concave and convex portions may be fitted.
Further, an adhesive may be applied and bonded in the attached state.

In this embodiment, the tip 10 is made of metal, and is formed of, for example, brass, stainless steel, or aluminum. The processing method of the tip 10 is arbitrary, such as press processing and lathe processing, but regular cutting is formed on the surface by cutting with a lathe.
And when the front end and the shaft tube are configured separately as in the present invention, the manufacturing process is such that after placing the refills 20 and 30 in the front shaft tube 11, the front end 10 is screwed together. It will be the order to complete.

  Conventionally, since only the above-described configuration has been used, the writing tip is brought into contact with the inner peripheral surface 10d of the tip 10 when the refills 20 and 30 appear and disappear, and the metal core insertion tube 21 and the tip 31 are in contact with each other. Rubbed and produced an unpleasant contact sound. In particular, in the retractable compound writing instrument as in the present embodiment, the writing tip of the refill 20/30 changes along the inclined side of the tip 10 at the time of protrusion, and the refill 20/30 tilts at that time so that the writing tool shaft is inclined. Since it protrudes from the hole 10a in the center, the contact with the inner peripheral surface 10d always occurs.

Further, frequent friction also causes malfunction such as bending of the core 22 and damage of the core insertion tube 21 in the mechanical pencil and damage of the tip 31 and dropout of the transfer ball 32 in the ballpoint pen.
When the grind is generated as described above, the grind is composed of a large number of irregularities in the circumferential direction, so that friction with the refills 20 and 30 at the time of intrusion is remarkably increased, and the writing tip may be caught. .

  Therefore, the resin coating 60 is disposed on substantially the entire inner peripheral surface 10d of the tip 10. The resin coating 60 is a thin, substantially conical body made of resin, and is in close contact with the inner peripheral surface 10 d of the tip 10. A hole 60a is formed at the apex of the substantially cone-like body so that the writing tip portion appears and disappears in the same manner as the tip 10.

By arranging the resin cover 60 on the inner periphery of the front opening 10 according to this configuration, the writing tip portion of each refill 20, 30 moves along the inner peripheral surface 60 b of the resin cover 60, so that smooth It is possible to move in and out.
And generation | occurrence | production of the unpleasant sound at the time of appearance, the vibration by friction, the damage of a writing tip part, etc. can be prevented effectively.

In addition to the resin coating 60, the present invention includes a position adjusting tube 70 that is in close contact with the inner peripheral surface of the front shaft cylinder 11, and a soft projecting ring 80 immediately after the position adjusting tube 70.
Although the position adjustment tube 70 is a simple tube body and is not shown separately, its front end 70a abuts on the rear end of the resin coating 60, and the soft projection ring 80 is positioned rearward by the length of the position adjustment tube 70. Yes.

At this time, it is preferable that the position of the soft projection ring 80 is set rearward so as not to interfere with unevenness such as the feeding mechanism 23 of the mechanical pencil refill 20.
The position adjusting tube 70 uses PP (polypropylene) having a relatively high hardness. In addition, synthetic resins such as POM, PE, and ABS can be selected as appropriate. However, in order to reduce friction with the refills 20 and 30 as much as possible, those having a smooth surface and slightly high hardness are desirable.

  As shown in FIG. 6A, the soft projection ring 80, which is an annular base material according to the present invention, is a side view and FIG. 6B is a front sectional view. I have. The protrusions 82 are ribs arranged in parallel to the axial direction of the shaft cylinder, and are arranged in parallel to the direction in which the refills 20 and 30 appear and disappear. Since the refills 20 and 30 slide between the protrusions 82, the friction is small and contributes to a smooth operation.

  Further, the protrusion 82 has a triangular shape and its tip 82a has a substantially point shape, and makes point contact with the refill. Therefore, the friction between the refills 20 and 30 and the projections 82 can be minimized, and when the refills 20 and 30 vibrate and collide with the projections 82, they can be reliably supported by the rib structure.

The material of the soft protrusion ring 80 is styrene TPE (thermoplastic elastomer), and the hardness is 45 degrees. Here, the term “soft” means that the hardness is approximately 20 degrees to 50 degrees, and is softer than a constituent member of a writing instrument, for example, a resin used for the position adjusting tube 70. The material of the soft projecting ring 80 can be changed as appropriate.
According to the applicant's test, the soft projections contribute to reducing the impact noise by softening, but even if the position adjustment tube is harder, the impact noise with the shaft cylinder can be reduced. It has been found that if it is as soft as a protrusion, it may feel friction when infested.

  As shown in FIG. 7, various projections 82 according to the present invention can be used. There may be 16 as shown in FIG. 7A, 24 as shown in FIG. Basically, the larger the number, the easier it is to absorb vibration, so the number of protrusions may be larger. However, manufacturing becomes difficult and friction with the refill occurs, so the number of protrusions is about 8 to 24. preferable.

  Further, a brush-like protrusion 82 may be used as shown in FIG. In this case, since the brush is soft and easily deformed and the friction with the refill is small, the density of the hair may be sufficiently dense.

  In the above embodiment, the configuration in which the soft protrusion ring 80 is fitted into the shaft cylinder 11 is shown, but the soft protrusion of the present invention may be directly attached to the shaft cylinder. Further, the position may be adjusted by directly bonding within the shaft tube without using the position adjusting tube.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of a retractable composite writing instrument according to an embodiment of the present invention. Same as above, front view. Cross-sectional explanatory drawing of a guide member. FIG. The expanded sectional view of the writing part front part in this invention Example. The side view and front sectional drawing of the annular base material which concern on this invention. Another embodiment of an annular base material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retractable type composite writing instrument 10 Front end 10a Hole 10c Rear end outer periphery 10d Inner peripheral surface 11 Front shaft cylinder 11a Mounting portion 20 Mechanical pencil refill 21 Core insertion tube 23 Feeding mechanism 30 Ball pen refill 40 Ball pen refill 60 Resin cover 60a hole 60b inner peripheral surface 60c rear end 70 position adjusting tube 70a front end 80 soft protrusion ring 81 base 82 protrusion

Claims (4)

In the retractable compound writing instrument that has a plurality of refills in the shaft cylinder and that allows the writing tip of the selected refill to appear and disappear,
At a position corresponding to the refill side of the inner peripheral surface of the shaft tube,
A retractable composite writing instrument comprising a plurality of soft protrusions protruding in the axial direction of a shaft cylinder, and the tips of the soft protrusions are substantially point-like . The retractable composite writing instrument according to claim 1, wherein the interval between the soft protrusions is an interval at which two or more soft protrusions can simultaneously contact at least one of the refills. The flexible projection, slide type composite writing utensil according to claim 1 or 2, characterized in that consists of rib-like bodies arranged in the barrel axis. In the haunting type composite writing instrument,
A circular tube-shaped position adjusting pipe disposed in the shaft tube;
4. A retractable composite writing instrument according to any one of claims 1 to 3 , further comprising: an annular base material whose position is regulated by the position adjusting tube and provided with the soft protrusion on an inner surface thereof.

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