JP6863487B2 - Haunting writing tool - Google Patents

Description

The present invention relates to the settability of the core body in a knock-type ballpoint pen in which the pen tip appears and disappears by arranging the core body in the barrel and pressing the knock component.

As an example, in a knock-type writing instrument in which the writing end of the writing member appears and disappears from the opening of the barrel due to the movement of the rotary cam member that engages and disengages with the cam surface formed on the inner wall of the barrel by receiving the pressing force of the push rod cam, the rotary cam. A writing member having a writing end and an ink storage portion provided in a hollow portion formed in the member is fixedly attached by press-fitting or screw fitting so that it can be manually attached and detached, and a step portion and a shaft cylinder of the rotating cam member. A knock-type writing instrument characterized in that an elastic member is hung between the rear step portion is known.
Judgment Hei 1-1730

By the way, in assembling the above-mentioned conventional technique, the shaft cylinder is divided into a tip metal, a front shaft, and a rear shaft, an elastic member is provided between the front shaft and the rear shaft, and then the front shaft and the rear shaft are joined. The process of setting the refill and screwing the tip is assumed. Further, since the user removes the tip metal portion and replaces the refill when replacing the refill, the elastic member is not lost. However, at the time of this assembly and replacement of the refill, when the refill is passed through the small diameter part of the axle cylinder, or when the refill is inserted into the rotor, the step portion where the refill end face is provided on the rotary cam and the small diameter inside the axle cylinder. It was caught on the end face of the part, which made me feel annoyed and reduced productivity.

Therefore, it is a retractable writing tool in which a refill that appears and disappears due to rotation of the rotor and forward and backward movement is arranged in the axle cylinder, and a partition wall made of circumferential ribs is provided on the inner surface of the axle cylinder, and the partition wall is provided. The rotor is arranged at the rear, a through hole through which the refill penetrates is provided in the partition wall, and a tapered portion whose diameter is reduced from the front end side to the rear end is provided at the front end of the through hole, while the rotation. The child is provided with a refill insertion hole into which the refill is inserted, a tapered portion having a reduced diameter from the tip to the rear is provided in the front portion of the refill insertion hole, and the inner diameter of the through hole provided in the partition wall is adjusted. Let D be, the inner diameter of the tip of the refill insertion hole provided in the rotor be E, the radius of the refill be F, and the gap between the inner diameter of the through hole and the outer diameter of the rotor be G. When the thickness at the front end of the child is H, the first gist is a haunting writing tool with DE <F and G + H <F, and when the refill is immersed, the tip of the rotor is divided. The second gist is that it is located within the area of the wall, and the third gist is that the barrel is composed of a front shaft and a rear shaft, and that the front shaft and the rear shaft are detachably connected to each other. It is a summary.

The present invention is a retractable writing tool in which a refill that appears and disappears due to rotation of a rotor and forward and backward movement is arranged in a barrel, and a partition wall with a circumferential rib is provided on the inner surface of the barrel, and the partition is provided. The rotor is arranged behind the wall, a through hole through which the refill penetrates is provided in the partition wall, and a tapered portion whose diameter is reduced from the front end side to the rear end is provided at the front end of the through hole. The rotor is provided with a refill insertion hole into which the refill is inserted, and a tapered portion whose diameter is reduced from the tip to the rear is provided in the front portion of the refill insertion hole, and the through hole provided in the partition wall is provided. The inner diameter is D, the inner diameter of the tip of the refill insertion hole provided in the rotor is E, the radius of the refill is F, and the gap between the inner diameter of the through hole and the outer diameter of the rotor is G. When the thickness at the front end of the rotor is H, the first gist is a haunting writing tool with DE <F and G + H <F. Therefore, when the refill is inserted, the refill pipe is attached to the tip of the rotor. Even if the tip comes into contact, it is guided to the insertion hole with a little vibration, and the refill can be set easily at the time of assembly or replacement of the refill, and it is possible to provide a knock-type writing tool with good productivity without feeling troublesome.

Further, since the second gist is that the tip of the rotor is positioned within the area of the partition wall when the refill is immersed, the rotor is more centered and the refill settability is improved. , The malfunction that the tip of the rotor collides with the partition wall at the time of knock operation is also suppressed.

In addition, since the third gist is that the axle is composed of a front shaft and a rear shaft, and the front shaft and the rear shaft are detachably connected to each other, the front shaft is removed and the refill is refilled. In the writing tool inserted from the tip, the troublesomeness at the time of refill replacement can be reduced as much as possible.

Front view showing the configuration of the present invention AA sectional view of FIG. AA cross-sectional view showing the pen tip-out state of FIG. Enlarged view of part B in FIG. Front view of the rear axle CC sectional view of FIG. Cross-sectional view showing the backlash prevention rib of the rear axle Front view of knock Front view of rotor FIG. 9 is a cross-sectional view taken along the line DD Front view of a rotor with a different shape EE sectional view of FIG. Front view of front axle FF sectional view of FIG. Front axle side view covering the grip Front view of the crown Crown cross section Side view of the crown with integrated clip Cross-sectional view of the crown with integrated clip Enlarged view of part G in FIG. Side view of the tip opening / closing clip when closed Side view of the tip opening / closing clip when opened Cross-sectional view at the time of refill set Cross-sectional view at the time of refill set Cross-sectional view at the time of refill set Step view with the rear end of the refill on the tip of the rotor Cross-sectional view in which the refill pipe is guided to the in-shaft taper portion Enlarged view of part H in FIG. 26 Front view showing another embodiment of the present invention FIG. 28 is a cross-sectional view taken along the line II. A cross-sectional view taken along the line AA showing the pen tip-out state of FIG. 28. Front view showing a form in which a clip is attached with an integrated crown

The action will be described. When the refill 4 is inserted from the tip of the rear shaft 3 with the pen tip 4b facing upward, the refill 4 passes through the through hole 1b provided in the partition wall 1a by free fall, and then the refill of the rotor 5 is inserted. It is inserted into the hole 5a. At this time, when the shaft core of the refill 4 and the shaft core of the shaft are displaced due to slight assembly deviation, the rear end portion of the refill 4 comes into contact with the inner wall of the rear shaft. However, the refill 4 is guided into the through hole 1b by the in-axis tapered portion 1C provided at the front end of the through hole 1b and whose diameter is reduced from the front end side to the rear end, and then the refill of the rotor 5 is performed. The rotor tapered portion 5b provided in the front portion of the insertion hole 5a so as to reduce the diameter from the tip to the rear smoothly guides the rotor 5 to the refill insertion hole 5a. At this time, when the inner diameter of the through hole 1b provided in the partition wall 1a is D, the inner diameter of the tip of the refill insertion hole 5a provided in the rotor 5 is E, and the radius of the refill 4 is F. By setting DE <F, even if the rear end of the refill 4 comes into contact with the tip of the rotor 5, it will fall into the rotor taper 5b of the rotor 5 with a little vibration and the refill will be inserted. You will be guided to the hole 5a. At the same time, when the gap between the inner diameter of the through hole 1b and the outer diameter of the rotor 5 is G and the thickness at the front end of the rotor 5 is H, G + H <F is set to obtain the inner diameter of the through hole 1b. The rear end of the refill 4 does not get into the outer diameter of the rotor 5, and the reliability of assembly is further improved. Further, the rotor 5 is in a region in the longitudinal direction in the axis of the through hole 1b provided in the partition wall 1a with the tip of the rotor 5 in the depressed state of the pen tip 4b, that is, in the region of the width S of the partition wall 1a. By being located at, the tip of the rotor 5 does not collide with the rear end surface of the partition wall 1a when the pen tip 4b appears and disappears, and the pen tip 4b can smoothly appear and disappear. Further, the phenomenon that the rear end portion of the refill 4 described above comes into contact with the tip end portion of the rotor 5 and the contacted state is maintained is less likely to occur, and at the same time, when the pen tip 4b is in the protruding state, the partition wall 1a The gap between the provided through hole 1b and the rotor 5 can be reduced as much as possible, and the deflection and rattling of the refill 4 during writing can be suppressed as much as possible. The in-shaft tapered portion 1C provided at the front end of the rear shaft through hole 1b and the rotor tapered portion 5b provided on the rotor 5 have a surface roughness (average roughness 1) that makes it difficult for the refill pipe to catch on the surface of the tapered surface. .60 μm or less). The maximum roughness of the surface was measured using VK-8500 (manufactured by KEYENCE, based on JIS B0601 1994), and the average value measured at 5 points was used. A 50x lens was used for the measurement, and the central portion of the captured image was cut out as a square having a side of 10 μm for the measurement.
A first example will be described with reference to FIGS. 1 to 6. It is a so-called infestation type writing tool in which a refill 4 which is a ballpoint pen body is arranged in a shaft body and the refill 4 which is a ballpoint pen body is arranged so as to be able to appear and disappear. The surface of the barrel made of a relatively hard resin material is coated with a relatively soft resin material (soft member) as the grip portion 6. As an example of the relatively hard resin material forming the barrel 1, polycarbonate is used in this example, but polyethylene terephthalate, acrylic, acrylonitrile butadiene styrene copolymer (ABS), and acrylonitrile styrene copolymer weight. Coalescence (AS), polypropylene and the like can be mentioned. Further, as the relatively soft resin material forming the soft member, although the thermoplastic elastomer is used in this example, soft acrylic and the like can also be mentioned. In this embodiment, the grip portion 6 is covered with a grip having a polygonal outer surface, but a grip having an uneven surface or a triangular grip is preferable because it does not slip easily when gripped. In this embodiment, the axle cylinder 1 is divided into two parts, a front shaft 2 and a rear shaft 3, and a male screw 2a is provided at the rear end of the front shaft 2 and a female screw 3a is provided at the tip of the rear shaft 3 to screw each other. Although it is integrated by this, a press-fitting fitting method may be used, or it may be formed as an integral body so that the tip metal portion can be removed.
A partition wall 1a made of a circumferential rib is provided inside substantially the center of the rear shaft 3, and a through hole 1b through which the refill 4 penetrates is provided at the center thereof. An elastic member 7 is provided behind the partition wall 1a, and one end of the elastic member 7 is in contact with the rear end surface of the partition wall 1a. On the other hand, the other end of the elastic member 7 is in contact with the front end surface of the rotor 5, and the rotor 5 is urged rearward by the elastic member 7. A knock 9 is inserted into the rear end opening 8a of the crown 8 so as to expose the rear end, and the rotor 5 slides back and forth in the crown 8 at the tip of the knock 9. It is interpolated. A refill 4 is press-fitted and fixed to the rotor 5, and the refill 4 slides back and forth along with the rotor 5. As a result, the pen tip 4b appears and disappears by pressing the exposed rear end portion of the knock 9. In this embodiment, a cam groove 8b is formed on the inner surface of the crown 8, and the pen tip 4b is repeatedly locked and released from the interpolated rotor 5 with the locking portion 5c. Although the rotary cam method for maintaining the haunting state is adopted, other haunting maintenance methods may be adopted.
A grip portion 6 made of a soft member is integrally molded on the front shaft 2 by two-color molding, but even if each is molded and the grip portion 6 is covered with the front shaft 2 by a later assembly process. I do not care. When coating by two-color molding, it is preferable that the front shaft 2 and the grip portion 6 are fused at the interface. For example, when polycarbonate is used for the front shaft 2, the grip portion 6 is a polyester-based elastomer. Compatibility with each other is important. If the fusion at the boundary surface is insufficient, the soft member may loosen with respect to the front shaft 2 over time. When the fusion is insufficient, or when the front shaft 2 and the grip portion 6 are molded separately, the grip covering portion of the front shaft 2 is prevented from loosening in order to prevent the grip portion 6 from loosening with respect to the front shaft 2. This is solved by providing a plurality of vertical ribs 2b for radial use. However, the relationship between the materials of the front shaft 2 and the grip portion 6 affects not only the problem of looseness but also the aesthetic appearance of the transparent grip portion 6 which has been increasing in recent years. If the interface is not fused during molding, air will collect at the end of the flow at the interface. When the grip portion 6 is transparent, air pools may be visible from the outside, which may spoil the aesthetic appearance. The problem can be solved by providing the above-mentioned vertical rib 2b for preventing loosening so as to guide the air to the secondary surface.

At the tip of the inner surface of the front shaft 2, refill leading ribs 2c for positioning the pen tip 4b at the center are formed at radial and evenly spaced positions. The inscribed circle diameter of the refill front rib 2c is set to be slightly larger than the outer diameter of the refill pipe, and the rear shape is set so that the diameter increases toward the rear, so that there is no resistance when the knock 9 is pressed. The pen tip 4b can appear and disappear. Further, of the plurality of refill advance ribs 2c provided radially, at least one, if not all, is formed longer than the other refill advance ribs 2c. This is because the core pin positioning rib 2d functions as positioning when moving from the primary side core pin to the secondary side core pin when the secondary side molding is performed by insert molding.

The rear shaft 3 has a partition wall 1a formed by a circumferential rib that divides the inside in the front-rear direction in the axial direction. The partition wall 1a has a through hole 1b through which the refill 4 penetrates. The partition wall 1a has a width S in the longitudinal direction of the shaft. Further, an in-shaft tapered portion 1C whose diameter is reduced from the front to the rear of the shaft is provided at the front end of the through hole 1b. The in-shaft tapered portion 1C is provided in a rib shape in this embodiment, but this is because sink marks due to thickening during molding are taken into consideration, and a circumferential rib may be integrally formed. When integrally provided as a circumferential rib, the refill 4 can be stably guided to the refill insertion hole 5a of the rotor 5 regardless of the diameter of the refill 4.

When the ribs are provided radially as in this embodiment, it is important that the distance Y between the ribs is not larger than the diameter Z of the refill 4. This is because if the rib-to-rib Y becomes larger than the diameter Z of the refill 4, the refill 4 may be caught there and the assembling property may be deteriorated.
Further, when the inner diameter of the through hole 1b provided in the partition wall 1a is D, the inner diameter of the tip of the refill insertion hole 5a provided in the rotor 5 is E, and the radius of the refill 4 is F, D. By setting −E <F, even if the rear end of the refill 4 comes into contact with the tip of the rotor 5, it will fall into the rotor taper 5b of the rotor 5 with a little vibration, and the refill insertion hole will be inserted. You will be guided to 5a. At the same time, when the gap between the inner diameter of the through hole 1b and the outer diameter of the rotor 5 is G and the thickness at the front end of the rotor 5 is H, G + H <F is set to obtain the inner diameter of the through hole 1b. The rear end of the refill 4 does not get into the outer diameter of the rotor 5, and the reliability of assembly is further improved.
Further, as in the present embodiment, the inner surface of the rear shaft 3 is a polyhedron having a polygonal cross section, the radial ribs are provided on the sides of the polygonal cross section, and the distance Y between the ribs is refilled as described above. By not making it larger than the diameter Z of 4, when assembling sideways or replacing the refill 4, the rear end of the refill 4 is guided by the apex in the cross-sectional shape polygon at the initial stage, and by further advancing. After contacting the ribs provided on the side portions of the polygonal cross-sectional shape, the two ribs form a rail shape, so that the rear end of the refill 4 can be stably guided to the through hole 1b.
There is a spring receiving surface 1d at the rear end of the partition wall 1a, and the load of the elastic member 7 is constantly received. Although the partition wall 1a is integrally provided inside the rear shaft 3 in this embodiment, it may be provided as a separate component. When the head crown 8 is inserted and fixed to the rear shaft 3, the tip of the head crown 8 is inserted from the rear end side of the rear shaft 3, and the engaging protrusion 8c of the head crown 8 is inserted into the engaging hole 1f of the rear shaft 3. At that time, the tip of the crown 8 is generally brought into contact with the spring receiving surface 1d of the rear shaft 3 to prevent backlash. However, the dimensions in the total length direction change depending on the molding conditions, resulting in looseness or insufficient press-fitting. Therefore, in this embodiment, a small space is provided between the spring receiving surface 1d and the tip surface of the crown 8 so that variation due to molding can be taken into consideration. The backlash generated by the small space is caused by the tip portion of the crown 8 coming into contact with the backlash prevention rib 1e having a substantially triangular cross section provided on the inner wall portion of the rear shaft 3 from the spring receiving surface 1d. It is relaxing. The shape of the backlash prevention rib 1e is most preferably triangular in order to suppress both backlash in the longitudinal direction and backlash generated in the axial direction, but the shape is not necessarily particular and a slight press-fitting relationship is sufficient. ..

An engaging hole for engaging and fixing the crown 8 is formed in the rear shaft 3. In this embodiment, the outer diameter of the crown 8 is substantially uniformly fitted within the inner diameter of the rear end of the rear shaft 3, but a shape in which a large diameter portion whose diameter is increased according to the rear end surface of the rear shaft 3 may be provided. Absent. In that case, the same effect can be obtained even if the backlash prevention rib 1e is provided not on the rear shaft 3 but on the collar portion of the large diameter portion and the small diameter portion of the crown 8. The engaging projection 8c of the crown 8 is provided with an inclined surface 8d in front, becomes a parallel portion 8e in the middle, and the rear of the parallel portion 8e is an engaging surface 8f. The ridgeline of the engaging surface 8f is an edge, and the contact area of the rear shaft 3 with the engaging hole 1f is increased as much as possible to improve the pull-out strength of the crown 8 and other ridgelines from the inclined surface 8d to the parallel portion 8e. Is R-shaped (arc-shaped). This is a temporary press-fitting state when the crown 8 is engaged with the rear shaft 3, but by providing R on the engaging protrusion 8c, it is possible to suppress damage to the inner surface of the rear shaft 3, cracking, etc. Can be less likely to occur. In order to suppress the cracking, in order to make it difficult for welds to be generated in the upper part of the engagement hole 1f of the rear shaft 3, the crown guide portion 1g in the upper part of the engagement hole 1f is R-shaped to suppress the generation of welds. Further, the gate 8h of the crown 8 is provided at a position separated from the top surface of the crown 8 by a certain distance. This is because it goes into the rear shaft 3 at the time of assembly and becomes inconspicuous in appearance. It is also because the user does not feel uncomfortable by touching the gate mark during use.
The rotor 5 is provided with a refill insertion hole 5a from the front end to the rear end, and the rear end of the refill 4 is inserted and fixed. As a method of fixing the refill 4, in addition to the refill press-fitting ribs 5d provided radially as in this embodiment, the press-fitting protrusions and the refill insertion holes 5a that are press-fitted all around are reduced in diameter toward the rear end. A press-fitting method using a tapered shape or a method of forming a press-fitting portion by making the cross-sectional shape irregular may also be used. As described above, the refill 4 is press-fitted and fixed to the rotor 5, but the refill 4 with the crimp 4c can also be used in consideration of versatility with other products. In that case, the refill 4 is not fixed to the rotor 5, but the elastic member 7 is arranged in the front shaft 2 to urge the refill 4 to the rear, and the rotor 5 only receives the end face of the refill 4. It doesn't matter. Further, with respect to the refill 4 having a large pipe diameter in which the amount of ink is increased, the refill member 7 is arranged in the front shaft 2 instead of being fixed to the rotor 5, and the refill 4 is urged rearward to urge the refill 4 to the rear. Can also be placed in a haunting manner by receiving the end face of the refill. Further, in the present embodiment, the refill insertion hole 5a is penetrated from the front end to the rear end, but this is simply air from the rear end portion of the refill 4 with respect to the ejection of the ink in the refill 4 at the time of writing. It is pierced for replacement and does not necessarily have to be pierced.
A knock 9 and a rotor 5 are inserted into the crown 8 from the tip end side thereof. The knock 9 is provided with a plurality of positioning ribs 9a having a mountain-shaped tip on the peripheral wall, and the positioning ribs 9a pass through the cam groove 8b even under their own weight when inserted into the crown 8 so that they can smoothly penetrate to the back. At the time of assembly, after the knock 9a is inserted, the rotor 5 is inserted from the tip of the crown 8. At this time, the rotor removal prevention rib 8g is provided near the tip of the inner wall surface of the crown 8 so that the inscribed circle diameter A of the rib is slightly smaller than the maximum diameter portion X of the rotor 5. The rotor 5 is inserted into the crown 8 so as to be movable back and forth over 8 g. That is, after the rotor 5 is inserted, the rotor 5 does not fall under its own weight.

An elastic member 7 having one end surface in contact with the spring receiving portion 1d of the rear shaft partition wall 1a and the other end in contact with the rotor 5 is inserted in the crown 8 and used. An elastic force is generated in response to the pressing of the knock 9 of the person, and rotation is generated by the knock 9, the cam groove 8b in the crown 8, and the cam portion of the rotor 5. By the rotation, the rotor 5 is repeatedly locked and unlocked, and the refill 4 appears and disappears. The total length of the elastic member 7 expands and contracts by being pushed by the rotor 5 in the crown 8 due to the infestation motion of the refill 4. The rotation direction of the rotor 5 is determined by the direction of the cam portion and the cam groove 8b of the crown 8, but the winding direction of the spring, which is the early elastic member 7, is preferably opposite to the rotation direction of the rotor 5. This is because when the rotor 5 rotates, the winding end portion of the spring or the like is caught, and malfunction is unlikely to occur. Further, the rotor 5 is molded from a resin having good lubricity such as POM (polyacetal), but in some cases, if a lubricant such as silicon is applied in advance, the operation is further improved. The outer diameter of the spring, which is the elastic member 7, is smaller than the rotor removal prevention rib 8 g of the crown 8, and is not affected during operation. Since the entire spring is inserted into the crown 8, if the crown 8 is formed of an opaque resin, the spring cannot be seen from the outside. Further, by molding the rear shaft 3 in a transparent tone, the crown 8 can be seen through the rear shaft 3, so that the change in color can be enjoyed.

In the first embodiment, the head crown 8 has a clip support portion 10 projecting from the outer peripheral portion of the head crown 8, a clip 11 that engages with the clip support portion 10, and a rear portion of the clip 11 of the barrel. A fulcrum 10a is provided with a coil spring 12 that urges the clip 11 to be separated from the outer peripheral surface, and side support plates 11a projecting from both side surfaces of the clip 11 are placed over the clip support portion 10 so that the clip 11 can rotate. The coil spring 12 is arranged behind the fulcrum 10a and is always urged so that the front of the clip 11 fulcrum 10a abuts on the outer peripheral surface of the barrel. Although the clip of the formula is provided, a crown in which the clip 11 is integrally provided with the crown 8 may be simply provided. When the tip opening / closing type clip as described above is provided on the crown 8, by providing two clip ball portions 11b, the number of contact points of the clip ball portion 11b with the outer peripheral surface is increased to two, and the clip 11 is provided. Is less likely to shake sideways.
(Additional note)
It is a retractable writing tool in which a refill that appears and disappears due to the rotation of the rotor and forward and backward movement is arranged in the axle cylinder, and a partition wall made of circumferential ribs is provided on the inner surface of the axle cylinder, and behind the partition wall. In addition to arranging the rotor, a through hole through which the refill penetrates is provided in the partition wall, and a tapered portion whose diameter is reduced from the front end side to the rear end is provided at the front end of the through hole, while the rotor is provided with a tapered portion. The first additional note is that a refill insertion hole into which the refill is inserted is provided, and a tapered portion whose diameter is reduced from the tip to the rear is provided in the front portion of the refill insertion hole. The inner diameter of the through hole is D, the inner diameter of the tip of the refill insertion hole provided in the rotor is E, the radius of the refill is F, and the inner diameter of the through hole and the outer diameter of the rotor When the gap is G and the thickness at the front end of the rotor is H, the second additional note is that DE <F and G + H <F. The third note is that the tip is located within the area of the partition wall, and the axle is composed of a front shaft and a rear shaft, and the front shaft and the rear shaft are detachably connected to each other. Is the fourth appendix.

According to the above (Appendix), it is a retractable writing tool in which a refill that appears and disappears due to the rotation of the rotor and the back-and-forth movement is arranged in the barrel, and a partition wall with a circumferential rib on the inner surface of the barrel. Is provided, the rotor is arranged behind the partition wall, a through hole through which the refill penetrates is provided in the partition wall, and a tapered portion whose diameter is reduced from the front end side to the rear end at the front end of the through hole. On the other hand, the rotor is provided with a refill insertion hole into which the refill is inserted, and a tapered portion whose diameter is reduced from the tip to the rear is provided in the front portion of the refill insertion hole. Therefore, it is possible to provide a knock-type writing tool that has good refill settability at the time of assembly or refill replacement, does not feel troublesome, and has good productivity.

Further, the inner diameter of the through hole provided in the partition wall is D, the inner diameter of the tip of the refill insertion hole provided in the rotor is E, the radius of the refill is F, and further, the inner diameter of the through hole is used. When the gap between the rotor and the outer diameter is G and the thickness at the front end of the rotor is H, the second note is that DE <F and G + H <F. Even if the tip of the refill pipe comes into contact with the tip of the rotor during insertion, it is guided to the insertion hole with a little vibration.

Further, since the third additional note is that the tip of the rotor is positioned within the area of the partition wall when the refill is immersed, the rotor is more centered, the refill settability is improved, and the refill settability is improved. Malfunctions in which the tip of the rotor collides with the partition wall during knock operation are also suppressed.

In addition, since the fourth appendix is that the axle is composed of a front shaft and a rear shaft, and the front shaft and the rear shaft are detachably connected to each other, the front shaft is removed and the refill is refilled with the rear shaft. In the writing tool inserted from the tip, the troublesomeness at the time of refill replacement can be reduced as much as possible.

1 Shaft cylinder 1a Section wall 1b Through hole 1c In-shaft taper part 1d Spring receiving surface 1e Rattling prevention rib 1f Engagement hole 1g Head crown guide part 2 Front shaft 2a Male thread part 2b Vertical rib 2c Refill advance rib 2d Core pin positioning rib 3 Rear shaft 3a Female screw part 4 Refill 4a Refill pipe 4b Pen tip 4c Crimp 5 Rotor 5a Refill insertion hole 5b Rotor taper part 5c Locking part 5d Refill press-fit rib 6 Grip part 7 Repulsion member 8 Head crown 8a Rear end opening 8b Cam groove 8c Engagement protrusion 8d Inclined surface 8e Parallel part 8f Engagement surface 8g Detachment prevention rib 8h Crown gate 9 Knock 9a Positioning rib 10 Clip support part 10a Support point 11 Clip 11a Support plate 11b Ball part 12 Coil spring

Claims (3)

It is a retractable writing tool in which a refill that appears and disappears due to the rotation of the rotor and forward and backward movement is arranged in the barrel. A partition wall with a circumferential rib is provided on the inner surface of the barrel, and behind the partition wall. In addition to arranging the rotor, a through hole through which the refill penetrates is provided in the partition wall, and a tapered portion whose diameter is reduced from the front end side to the rear end is provided at the front end of the through hole, while the rotor is provided with a tapered portion. Is provided with a refill insertion hole into which the refill is inserted, a tapered portion having a reduced diameter from the tip to the rear is provided in the front portion of the refill insertion hole, and the inner diameter of the through hole provided in the partition wall is set to D. The inner diameter of the tip of the refill insertion hole provided in the rotor is E, the radius of the refill is F, and the gap between the inner diameter of the through hole and the outer diameter of the rotor is G. A haunting writing tool with DE <F and G + H <F, where H is the thickness at the front end. The haunting type writing tool according to claim 1, wherein the tip end portion of the rotor is located in the area of the partition wall at the time of immersion of the refill. The haunting type writing tool according to claim 1 or 2, wherein the axle tube is composed of a front shaft and a rear shaft, and the front shaft and the rear shaft are detachably connected to each other.

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