JP7011465B2 - Stationery - Google Patents

Description

The present invention relates to a clip placed at the rear of the barrel and a writing instrument with an improved crown mounting structure.

Clips are generally placed at the rear of the barrel in a writing instrument, and in such writing tools, a structure is adopted in which the base end of the clip is attached to the rear end of the barrel by, for example, a crown. ..
In Patent Documents 1 to 3, the base end portion of the clip is formed into a ring shape, and the ring-shaped base end portion is attached to the rear end portion of the barrel by screwing or fitting the crown. Has been adopted.
Then, a notch or a protrusion is provided on a part of the shaft cylinder with which the base end portion of the clip is in contact, and a part of the clip engages with the notch or the protrusion so that the clip can be attached to the shaft cylinder. A detent mechanism that prevents it from rotating freely is also adopted.

On the other hand, in Patent Document 4, a slit-shaped opening is provided on the peripheral side surface on the rear end side of the barrel, and the base end portion of the clip formed in an L shape is inserted into the slit-shaped opening. A configuration in which a clip is attached in the barrel is disclosed.
That is, a through hole is provided in the base end portion of the clip, and a screw inserted through the through hole in the barrel is screwed into the back side of the crown fitted in the rear end portion of the barrel. A clip is attached.

Japanese Unexamined Patent Publication No. 57-32983 Jikkenhei 7-40191 Gazette Jitsukaihei 7-23592 Gazette Jikkensho 10-6128 Gazette

By the way, in recent years, this kind of writing tool is provided with high-class products, and such products are often adopted as souvenirs, for example.
In such commemorative items, the shaft tube may be given a name or name, for example, when the clip is opened due to plastic deformation, or when the crown is damaged due to dropping. Often receives a repair request to replace the necessary parts, leaving the barrel.
Therefore, it is necessary for the provider of the above-mentioned product to take care so that it can be easily disassembled and assembled in preparation for repair such as replacing a part of the product.

By the way, in the writing tools disclosed in the above-mentioned Patent Documents 1 to 4, the crown is fitted to the shaft cylinder or attached by screwing, and the base end portion of the clip is sandwiched between the shaft cylinder and the crown. Alternatively, the clip is attached to the back side of the crown by attaching the base end of the clip with a screw.
In this case, for example, when the crown can be easily removed from the barrel by the user, in order to avoid the problem of losing the parts, the product provider may use an adhesive together with the attachment. There are many. In such a case, it may not be possible to replace or repair some parts, and it may take time to remove the adhesive.

Therefore, the present invention is intended to provide a writing tool capable of easily attaching and detaching a clip and a crown to and from a barrel.
In addition, when installing and removing columnar parts such as the crown, it does not cause any trouble in the work due to idling, etc., and the clip is sufficiently fastened using the crown. The main task is to provide a writing tool that can realize a reliable fixed state such as.

The writing tool according to the present invention, which has been made to solve the above-mentioned problems, is attached to the side surface of the barrel by a barrel, a crown attached to the rear end of the barrel, and a support shaft of the crown. The clip is provided with a sleeve nut that is screwed into the support shaft of the crown and abuts on the base end portion of the clip to fix the base end portion of the clip to the barrel. A through hole is formed in the portion through which the support shaft of the crown is inserted, and a linear edge portion is formed in the through hole, and the support shaft of the crown is formed toward the linear edge portion. It is characterized in that the axial rotation of the support shaft of the crown inserted through the through hole is prevented by the position of the face-cutting portion formed on the surface.

In this case, preferably, a slit-shaped opening is formed on the side surface of the shaft cylinder, the base end portion of the clip is inserted into the opening, and the clip is attached to the side surface of the shaft cylinder. Slit.
Further, the crown attached to the rear end of the barrel is configured to have a ring-shaped crown decoration so as to surround the crown.

In one more preferred embodiment, the rear end of the barrel is formed with a bent end face perpendicular to the axis, and the bent end face has a non-circular opening with a linear opening edge. By locating the face-cutting portion formed on the crown decoration toward the linear opening edge portion, it is possible to prevent the axial rotation of the crown decoration inserted in the non-circular opening. However, a configuration in which a decorative nut is fastened to the male screw of the crown decoration located inside the barrel is adopted.

Then, it is desirable that the base end portion of the clip is sandwiched and fastened between the decorative fixing nut and the sleeve nut.

According to the writing tool according to the present invention described above, a linear edge portion is formed in the through hole formed at the base end portion of the clip, and a face strip formed on a support shaft of the crown toward this edge portion. The part is located and the crown is stopped. Therefore, the screwing operation of the sleeve nut for fixing the base end portion of the clip can be smoothly performed. This enables smooth operation when removing the sleeve nut when replacing parts or the like.

On the other hand, a linear opening edge is formed in the opening formed in the bent end surface at the rear end of the barrel, and the face-cutting portion formed in the crown decoration is located toward this edge. So, the crown decoration is stopped. Therefore, the operation of fastening the decorative fixing nut for fixing the crown decoration to the rear end of the axle tube can be smoothly performed, and the same can be smoothly performed when removing the decorative fixing nut.

Then, the decorative fixing nut fastened together with the crown decoration is used as a base on the bent end surface at the rear end of the barrel, and the base end of the clip is fastened by sandwiching it with the sleeve nut, so that the clip is strengthened. It is possible to fix it securely.

The whole structure of the pay-out type writing instrument which concerns on this invention is shown, (A) is a front view, (B) is a central sectional view. It is a perspective view which showed the appearance composition of the writing refill. It is a central sectional view of a writing refill. FIG. 3 is an enlarged cross-sectional view of the rear end of the writing tool shown in FIG. FIG. 3 is an enlarged cross-sectional view of the front end of the writing tool shown in FIG. It is a partial end view which showed the 1st example of a return spring. It is a partial end view which showed the 2nd example of a return spring. It is a perspective view which showed by partially breaking the rear end part of the writing tool shown in FIG. It is a perspective view of a single rear axle. It is a top view of a single rear axle. It is a central sectional view of a single rear axle. It is a perspective view of a clip alone. It is the top view of the clip alone. A crown decoration is shown, (A) is a perspective view, (B) is a perspective view with a different viewpoint, (C) is a central sectional view, and (D) is a bottom view. A decorative nut is shown, (A) is a perspective view, (B) is a perspective view from a different viewpoint, (C) is a central sectional view, and (D) is a bottom view. It is a front view of the crown. It is a perspective view of a crown. It is a perspective view of a sleeve nut. It is a perspective view which changed the viewpoint of a sleeve nut. It is a central sectional view of a sleeve nut.

The pay-out type writing tool according to the present invention will be described based on the embodiment shown in the figure.
In each of the drawings shown below, the same parts are indicated by the same reference numerals. It may be explained by quoting the reference numerals attached to the drawings.
1 (A) and 1 (B) show the overall configuration of a pay-out type writing instrument, and this pay-out type writing instrument is composed of a cylindrical front shaft 1A and a rear shaft 1B having substantially the same outer diameter. It constitutes the shaft cylinder 1. Then, as will be described later, the rear shaft 1B is rotated relative to the front shaft 1A to form a rotary feeding type writing instrument in which the writing portion appears and disappears from the mouth end portion of the front end portion of the shaft cylinder.

A cylindrical connecting body 2 having a female screw on the inner peripheral surface of the tip and a male screw on the outer peripheral surface of the rear end is attached to the front end portion of the front shaft 1A, and the tip end side via the connecting body 2. A metal mouthpiece (mouthpiece) 3 is attached to the surface, and a decorative cylinder 4 is attached between the mouthpiece 3 and the front shaft 1A.
An opening 3a is formed at the tip of the tip portion 3 formed into a conical shape, and the tip writing portion 5a of the writing refill 5 housed in the barrel 1 appears and disappears from the opening 3a. It is configured in.

The pay-out type writing instrument shown in this example is coated with heat-discolorable ink capable of discoloring the handwriting by applying heat from a friction member or the like from the tip writing portion 5a of the writing refill 5. The pay-out type writing tool shown in this example does not have a friction member made of a rubber elastic material such as a thermoplastic elastomer on the outer surface of the writing tool, so that the outer surface of the shaft cylinder is less conspicuous even after long-term use. Discolorable writing tools can be provided.
As the writing refill 5, it is natural that a ballpoint pen refill having a ballpoint pen tip in the tip writing portion 5a or a refill having another writing tip such as a marking pen core can be used.

Here, the heat-discolorable ink is a different color (second color) when a predetermined color (first color) is maintained at room temperature (for example, 25 ° C.) and the temperature is raised to a predetermined temperature (for example, 60 ° C.). An ink that has the property of returning to the original color (first color) when it is cooled to a predetermined temperature (for example, -5 ° C). In a writing instrument using heat-discolorable ink, the second color is made colorless, and the drawn line written in the first color (for example, red) is heated by the friction to make it colorless, so that the drawn line is substantially made colorless. It can be erased. Of course, the second color can be colored other than colorless.

As shown in FIGS. 2A and 2B, the writing refill 5 includes a metal tube 5A that supports the tip writing portion 5a and a resin plug 5B attached to the rear end portion of the metal tube 5A. I have. The metal tube 5A is made into an ink accommodating tube when the writing refill 5 is a ballpoint pen refill.
Then, the tip portion of the metal tube 5A is thinly molded so as to have an outer diameter dimension substantially the same as that of the tip writing portion 5a to form a small diameter portion 5b, and the diameter is increased from the small diameter portion 5b. It is integrally molded so as to be continuous with the large diameter portion 5d of the main body via the tapered portion 5c.

On the other hand, the plug 5B that closes the rear end of the metal tube 5A is formed with a plurality of cam surfaces arranged in an annular shape, grooves along the axial direction, and the like, and the cam surface 5e and the like are, for example, a knock type. When attached to the pay-out writing instrument, the writing refill 5 acts to be locked in a forward and backward state every time the writing refill 5 is rotated by a predetermined angle.

On the other hand, as shown in an enlarged cross-sectional view of the tip of the writing instrument in FIG. 4, the above-mentioned writing portion 5a has a tapered surface 5a1 formed on the tip thereof. Further, at the rear end portion of the writing portion 5a, a mounting portion 5a2 is formed having a diameter slightly smaller than that of the central portion thereof, and the mounting portion 5a2 is fitted to the small diameter portion 5b of the metal tube 5A. It is attached.
Then, when the angle centered on the axis of the tapered surface 5a1 formed in the tip writing portion 5a is α1, and the internal surface angle centered on the axis in the opening 3a of the mouth tip portion 3 is α2, the relationship is α1> α2. Is set to.
In the example shown in the figure, α1 = 35 degrees and α2 = 10 degrees.

When the writing refill 5 is, for example, a ballpoint pen refill, the ballpoint pen tip as the tip writing portion 5a is often formed of a metal material. In this case, the tapered surface 5a1 is cut by a processing machine such as a lathe. If this is the case, a lathe, which is a circumferential cutting mark, is left on the tapered surface 5a1.
As a result, when the tip writing portion 5a is drawn out from the opening 3a of the mouth tip portion 3, the grain left on the tapered surface 5a1 of the tip writing portion 5a is rubbed against the inner surface of the opening 3a of the mouth tip portion 3. Where an unpleasant sliding contact sound is generated, by setting the relationship between α1 and α2 described above, it is possible to effectively prevent the generation of an unpleasant sliding contact sound.

On the other hand, a coil-shaped return spring 6 is attached to the small diameter portion 5b of the writing refill 5. As shown in FIG. 4, the front end portion of the return spring 6 is in contact with the inner surface of the mouth tip portion 3 and the annular contact portion 3b formed by reducing the inner diameter in a stepped manner, and is in contact with the annular contact portion 3b formed after the spring 6. As shown in FIG. 1, the end portion is arranged in contact with the tapered portion 5c in the metal tube 5A of the refill 5. As a result, the return spring 6 urges the writing refill 5 toward the rear in the barrel 1.

5A and 5B show preferred first and second forms of the return spring 6 described above, with an end view showing the middle abdomen thereof.
First, in the first form of the return spring 6 shown in FIG. 5A, the coil pitch of the spring 6 on the front end side (left side in the figure) and the rear end side (right side in the figure) is in close contact with the middle abdomen. It is formed as narrow as possible. The rear end portion side is formed into a diameter-expanded portion 6a whose outer diameter is gradually expanded, and the diameter-expanded portion 6a on the rear end portion side comes into contact with the tapered portion 5c in the metal tube 5A of the writing refill 5. The writing refill 5 and the return spring 6 are configured so that their axes are aligned with each other.

Then, the front end portion side of the return spring 6 abuts on the annular contact portion 3b (FIG. 4) of the mouth tip portion 3 to urge the writing refill 5 toward the rear in the barrel 1 as described above. ing.
Further, when the diameter on the front end side of the return spring 6 shown in FIG. 5A is set to D1, a constricted portion 6b1 having a diameter smaller than the diameter D1 is formed in the middle abdomen of the spring 6, and the constricted portion 6b1 is formed. Regions 6c1 and 6c2 having a diameter substantially equal to the diameter D1 are formed before and after the above.
That is, the constricted portion 6b1 is formed so that the outer diameter of the return spring 6 is the minimum diameter, and the outer diameter of the enlarged diameter portion 6a on the rear end portion side is formed to the maximum diameter.

Further, in the second form of the return spring 6 shown in FIG. 5B, the configuration of the front end portion side (left side in the figure) and the rear end portion side (right side in the figure) of the spring 6 is the first configuration shown in FIG. 5A. It is the same as the form, and the description thereof will be omitted.
In the return spring 6 of the second form, regions (bulging portions) 6d1 and 6d2 having a diameter slightly larger than the diameter D1 on the front end side are formed before and after the middle abdomen, and between the regions 6d1 and 6d2. In addition, a region 6b2 having a diameter substantially equal to the diameter D1 is formed. That is, in the return spring 6 of the second form, the region 6b2 corresponds to the constricted portion having the minimum outer diameter in the return spring 6.

According to the return springs 6 of the first and second forms provided with the constricted portions 6b1 and 6b2, the writing portion 5a is drawn out from the mouth portion 3 to enable writing, that is, the return spring 6 is contracted. In the above, the constricted portions 6b1 and 6b2 of the return spring 6 act to prevent bending from occurring in the central portion of the return spring 6 by appropriately contacting a part of the small diameter portion 5b of the writing refill. do.

Therefore, the repulsive force due to the return spring 6 acts mainly in the axial direction, and the bending of the middle abdomen of the return spring 6 causes the tip writing portion 5a to strongly move toward a part of the opening 3a of the mouth tip portion 3. It is possible to solve the problem of the conventional writing tool that is pressed.
Thereby, the tip writing portion 5a can be set to be positioned substantially at the center of the opening 3a of the mouth tip portion 3. Therefore, the tip writing portion 5a passing through the opening 3a of the mouth tip 3 receives the writing pressure in a state of receiving the spring pressure deviated from the axial center, and the tip writing portion 5a reciprocates in the opening 3a of the mouth tip portion 3. It is possible to effectively suppress the generation of abnormal noise (collision sound = ticking sound).

Further, when the return spring 6 of the second form shown in FIG. 5B is used and the gap between the spring 6 and the inner peripheral surface of the tip portion 3 is appropriately adjusted, the spring 6 is about to bend. By setting the bulging portions 6d1 and 6d2 of the spring 6 to come into contact with the inner peripheral surface of the mouthpiece portion 3, the tip writing portion 5a is similarly positioned substantially at the center of the opening 3a of the mouthpiece portion 3. It can also be configured.

As shown in FIGS. 1 and 6, a connecting member 8 having a female thread on the inner peripheral surface is attached to the rear end opening of the front shaft 1A by fitting. On the other hand, a cylindrical screw member 9 is attached to the opening at the front end of the rear shaft 1B so as to be rotatable with respect to the rear shaft 1B at a predetermined rotation angle, and is formed on the screw member 9. The male screw is screwed into the female screw of the connecting member 8 fitted to the front shaft 1A, whereby the front shaft 1A and the rear shaft 1B are connected.
A female screw is provided on the inner peripheral surface of the rear end portion of the screwing member 9, and the front end portion of the rotating member 12 provided in the rotary feeding unit 11 is screwed and attached to the female screw.

As shown in FIG. 1, a slider 13 is housed in the rotary feeding unit 11, and a cam member 14 is housed in the rear portion of the slider 13. Then, the unit case of the rotary feeding unit 11 rotates relative to the rotating member 12, and the slider 13 is pushed forward by the action of the cam member 14.
A short-axis member 15 that can move in the axial direction is arranged at the tip of the slider 13, and the front end of the short-axis member 15 is attached to a plug 5B attached to the rear end of the writing refill 5. It is in contact.

The rotary feeding unit 11 is mounted in the rear shaft 1B via a sleeve nut as described later, and therefore, by rotating the rear shaft 1B in one direction with respect to the front shaft 1A (rotating to the right). The tip writing portion 5a of the writing refill 5 is drawn out from the tip opening 3a of the mouth tip portion 3. Further, by rotating the rear shaft 1B relative to the front shaft 1A in the other direction (rotating counterclockwise), the tip writing portion 5a is accommodated in the mouth tip portion 3 under the action of the return spring 6 described above. It will be.
That is, in this embodiment, the rear shaft 1B constitutes the feeding operation unit of the tip writing unit 5a.

7A, 7B and 7C show a single configuration of the rear shaft 1B, the rear shaft 1B is formed in a cylindrical shape as described above, and the rear end is bent so as to be orthogonal to the axis. 1a is integrally formed. A non-circular opening 1c provided so as to face the linear opening edge 1b is formed in the central portion of the bent end surface 1a. Further, a slit-shaped opening 1d is formed in a part of the side surface in the immediate vicinity of the rear end portion of the rear shaft 1B, because the base end portion of the clip described later is inserted and attached to the rear shaft 1B. It will be used.

8A and 8B show a single configuration of the clip 17, which is formed into an L shape, and the base end portion 17a thereof is inserted into the slit-shaped opening 1d of the rear shaft 1B described above. It is attached to the rear shaft 1B. In addition, a through hole 17c formed in a D shape by forming a linear edge portion 17b in a part of a circle is formed in the base end portion 17a.
A clip ball 17d is integrally molded at the tip of the clip 17.

9 (A), (B), (C), and (D) show the crown decoration 18, and a through hole 18a is formed in the axial center portion of the crown decoration 18, and the whole is a ring. It is molded into a shape.
The crown decoration 18 has a large-diameter head 18b, a small-diameter central neck 18c, and a cylindrical portion having a slightly smaller diameter following the neck 18c, and male threads 18d are formed.
Further, the neck portion 18c is formed with a face-cutting portion 18e formed in a plane toward both outer sides, and the pair of face-cutting portions 18e is a non-circular opening 1b of the rear shaft 1B described above. By being inserted along the linear opening edge 1b in the above, it functions as a detent for the crown decoration 18 with respect to the rear shaft 1B.

FIGS. 10A, 10B, C), and 10D show a decorative nut 19, and a through hole 19a is formed in the axial center of the decorative nut 19 to form a ring. It is molded and a female screw 19b is formed in the through hole 19a. On the cylindrical peripheral surface 19c of the decorative nut 19, a surface cutting portion 19d formed in a flat shape toward both outer sides is formed. In addition, a flange portion 19e is formed at the axial end portion of the decorative fixing nut 19.

11A and 11B show the crown 20, the upper surface of the circular head 20a of the crown 20 constitutes a part of a spherical surface having a large curvature, and the head 20a is slightly flesh in the axial direction. It is thickly formed. Following the head portion 20a, a columnar support shaft 20b having a reduced diameter is formed, and a male screw 20c is formed on the tip end side of the support shaft 20b with a slightly smaller diameter. A flat surface cutting portion 20d is formed along the axial direction on the tip end side of the support shaft 20b including the male screw 20c.

12A, 12B and 12C show a sleeve nut 21, which is entirely formed into a cylindrical shape and has a flange 21b at the end of a neck portion 21a having a reduced diameter. Along with the formation, a female screw 21c is formed on the inner peripheral surface of the neck 21.
A U-shaped notch 21e is formed at the opening edge of the large diameter portion 21d at positions facing 180 degrees along the circumferential direction.

3 and 6 show a state in which the clip 17 and the rotary feeding unit 11 are attached to the rear shaft 1B by using the crown decoration 18, the decorative nut 19, the crown 20, and the sleeve nut 21. ..
In order to assemble into the state shown in FIGS. 3 and 6, first, the surface cutting portion 18e formed on the crown decoration 18 is applied to the linear opening edge portion 1b formed on the bent end surface 1a of the rear shaft 1B.

In this state, the decorative fixing nut 19 is inserted into the rear shaft 1B by using a first jig (not shown) provided with a bifurcated protrusion that engages with the face-cutting portion 19d of the decorative fixing nut 19. 1 By rotating the jig around the axis, the female screw 19b of the decorative nut 19 is screwed into the male screw 18d of the crown decoration 18 located inside the rear shaft.
In this case, since the face-cutting portion 18e of the crown decoration 18 hits the linear opening edge portion 1b of the rear shaft 1B, the crown decoration 18 is detented with respect to the rear shaft 1B, and therefore, the decoration is stopped. The nut 19 can be smoothly tightened to the crown decoration 18. As a result, the crown decoration 18 and the decoration fixing nut 19 can be smoothly attached to the rear shaft 1B.

Subsequently, the base end portion 17a of the clip 17 is inserted into the slit-shaped opening 1d of the rear shaft 1B, and the tip portion on which the male screw 20c of the crown 20 is formed is inserted into the through hole 18a of the crown decoration 18. At this time, the tip portion of the crown 20 is inserted so that the face-cutting portion 20d of the crown 20 is along the linear edge portion 17b formed in the D-shaped through hole 17c of the clip 17. As a result, the crown 20 is stopped from rotating with respect to the clip 17. At the same time, the base end portion 17a of the clip 17 is temporarily fixed by the support shaft of the crown 20 inserted into the through hole 17c so as not to come out of the slit-shaped opening 1d of the rear shaft 1B.

In this state, the sleeve nut 21 is attached to the rear shaft 1B by using a second jig (not shown) provided with a pair of protrusions engaged with the pair of notches 21e formed in the large diameter portion 21d of the sleeve nut 21. The female screw 21c of the sleeve nut 21 is screwed into the male screw 20c of the crown 20 by inserting the second jig into the shaft and rotating the second jig.
At this time, as described above, the crown 20 is prevented from rotating by the D-shaped through hole 17c of the clip 17, and therefore, the sleeve nut 21 is attached to the male screw 20c formed on the support shaft 20b of the crown 20. Can be tightened smoothly. As a result, the base end portion 17a of the clip 17 is sandwiched and fixed between the sleeve nut 21 and the flange portion 21b using the decorative nut 19 as a base.

In this state, the rotary feeding unit 11 is fitted and fixed in the large diameter portion 21d of the sleeve nut 21, and the short shaft member 15 and the screw are screwed on the front portion of the rotary feeding unit 11 as shown in FIG. By sequentially mounting the members 9, the configurations shown in FIGS. 1 and 6 on the rear shaft 1B side can be assembled.

As described above, according to the writing tool according to the present invention, the crown decoration attached to the rear end portion of the barrel is prevented from rotating with respect to the barrel by the face-cutting portion formed on the crown decoration. It is possible to smoothly fasten the decorative nut that is screwed into the barrel to the crown decoration. In addition, since the crown is prevented from rotating with respect to the through hole formed at the base end of the clip by the face-cutting portion formed on the support shaft of the crown, the sleeve nut is screwed into the support shaft of the crown. The operation can be performed smoothly.
As a result, the base end of the clip can be firmly fastened by sandwiching the base end of the clip with the sleeve nut, using the decorative nut fastened to the barrel together with the crown decoration as a base, and the clip to the barrel and the ceiling can be firmly fastened. It is possible to provide a writing instrument that makes it possible to easily attach and detach the crown.

The crown and the clip can be attached to and detached from the barrel by using the above-mentioned first and second jigs, and the crown and the clip can be disassembled by using a generally distributed screwdriver or the like. That is difficult.
Therefore, according to the writing tool in the illustrated example, in order to avoid the problem that the user disassembles and loses the parts, it is not necessary to use an adhesive or the like together with the crown portion, which further contributes to the ease of assembly and disassembly. It will be possible.

1 Shaft cylinder 1A Front shaft 1B Rear shaft (feeding operation unit)
1a Bent end face 1b Straight opening edge 1c Non-circular opening 1d Slit-shaped opening 3 Mouth tip (base)
3a Tip opening 5 Writing refill 5A Metal tube (ink storage tube)
5B Plug 5a Writing part 5a1 Tapered surface 5a2 Mounting part 5b Small diameter part 5c Tapered part 5d Large diameter part 6 Return spring 6a Diameter expansion part 6b1, 6b2 Constriction part 6d1, 6d2 Bulge part 11 Rotating feeding unit 12 14 Cam member 15 Short shaft member 17 Clip 17a Base end 17b Straight edge 17c Through hole (D-shaped through hole)
18 Crown decoration 18a Through hole 18b Head 18c Neck 18d Male screw 18e Face shaving part 19 Decorative nut 19a Through hole 19b Female screw 19c Cylindrical peripheral surface 19d Face cutting part 19e Collar 20 Crown 20a Head 20b 20d Surface cutting part 21 Sleeve nut 21a Neck part 21b Collar part 21c Female thread 21d Large diameter part 21e Notch part

Claims (1)

The barrel, the crown attached to the rear end of the barrel, the clip attached to the side surface of the barrel by the support shaft of the crown, and the clip screwed into the support shaft of the crown. A sleeve nut that fixes the base end of the clip to the barrel by contacting the base end of the clip is provided.
A through hole through which the support shaft of the crown is inserted is formed at the base end portion of the clip, and a linear edge portion is formed in the through hole, and the linear edge portion is formed toward the linear edge portion. By locating the face-cutting portion formed on the support shaft of the crown, the shaft rotation of the support shaft of the crown inserted through the through hole is prevented .
A ring-shaped crown decoration is attached to the crown attached to the rear end of the barrel so as to surround the crown, and the rear end of the barrel is orthogonal to the axis. With the formation of a bent end face
A non-circular opening with a linear opening edge is formed on the bent end face.
By locating the face-cutting portion formed on the crown decoration toward the linear opening edge portion, it is possible to prevent the axial rotation of the crown decoration inserted in the non-circular opening.
A writing tool characterized in that a decorative nut is fastened to a male screw of the crown decoration located inside the barrel .

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