JP2009184351A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable writing utensil, with which the operating noise developing at the retreat of a pusher is made to have a little offensively sensing profound sound quality. <P>SOLUTION: In the retractable writing utensil, the writing part 21a which is extended from the fore end of a barrel by forwardly slidingly operating the synthetic resin pusher 30 and retracted in the barrel by backwardly sliding the pusher 30 by means of the energizing force of an energizing member 51, and a bottomed cylindrical member 60 to be striningly contacted with the barrel with its opening part facing forwards and its bottom part facing backwards is provided so as to strikingly contact with the pusher 30 at its backward sliding at the rear end part of the barrel 10. The member 60 to be strikingly contacted, at least the portion strikingly contacting with the pusher 30 of which is made of metallic material, is immobile back and forth to the rear end part of the barrel and, at the same time, is fixed so as to tightly close the rear end part of the barrel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a retractable writing instrument in which a writing tip such as a ballpoint pen tip or a mechanical pencil tip is caused to protrude from the tip of a shaft tube by an operation of moving a pusher back and forth.

Conventionally, in this type of invention, as in the invention described in Patent Document 1, for example, the pusher (30) biased rearward by the biasing member (spring 71) is slid forward. Then, the writing tip (tip 22) is brought into a projecting state, and the pusher (30) is slid backward by the biasing force of the biasing member (spring 71), so that the writing tip (tip 22) is immersed. There are multi-colored writing tools that are in a state.
According to such a retractable writing instrument, the pusher (30) urged rearward is slid by a predetermined amount, so that the pusher (30) slid rearward has a predetermined contacted portion. A contact sound is generated when the contact is made. In addition, although the description of the said contacted part is abbreviate | omitted in patent document 1, according to the structure of a general multi-color in / out type writing instrument, the operation protrusion part (32) in each presser (30) It was formed on the inner surface of the shaft tube so that the front end side portion was brought into contact.

The contact sound generated by the pusher as described above has a usefulness that the user himself / herself can visually confirm the operating state (the state where the writing tip portion appears and disappears), and is not necessarily unpleasant. However, the operation sound of the conventional multicolor writing instrument is often a high tone having a relatively high frequency, and it is often felt uncomfortable.
JP 2003-63186 A

  The present invention has been made in view of the above-described conventional circumstances, and a problem to be solved by the present invention is that the operation sound when the pusher is retracted can be made into a heavy sound quality that is less disturbing to the ears. Is to provide.

  In order to solve the above-mentioned problem, the technical means according to the present invention is such that the writing portion protrudes from the front end of the shaft cylinder by the sliding operation of the synthetic resin pusher, and the pusher is biased by the biasing member. In the retractable writing instrument in which the writing part is sunk into the shaft cylinder by sliding it backwards, the rear end of the shaft cylinder is in contact with the pusher when sliding backward, A bottomed cylindrical abutting member with the opening facing forward and the bottom facing backward is provided, and the abutting member is formed of a metal material at least at the portion abutted by the pusher, It is fixed in such a manner that it is immovable in the front-rear direction with respect to the rear end portion of the shaft tube and is sealed so as to seal the rear end portion of the shaft tube.

  In a further technical means, the abutted member is characterized in that a substantially entire region of the peripheral wall portion is formed of a metal material.

  In a further technical means, the abutted member is configured to annularly attach to the rear end side of the shaft cylinder so as to abut against the pusher, and to press the annular member from the rear side. And a bottomed tubular portion screwed to the rear end side of the shaft tube.

  In a further technical means, the metal material is a brass material.

  In a further technical means, a rearward protrusion is provided on the rear end side of the pusher, and the protrusion end of the protrusion is in contact with the contacted member.

Since the present invention is configured as described above, the following effects can be obtained.
When the pusher slides rearward by the urging force of the urging member and abuts against the abutted member, the abutment sound can be made into a heavy sound quality that is less likely to be disturbed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
This retractable writing instrument A is arranged on the rear end side of the shaft tube 10 for projecting and retracting the writing portion 21a of the refill 21 for the ballpoint pen and the writing portion 22a of the refill 22 for the mechanical pencil from the front end 11. A plurality of pushers 30 and a clip 40 with an opening / closing operation function, and a contacted member 60 for abutting the clip support 41 of the pusher 30 or the opening / closing operation function clip 40 when sliding backward, One selected pusher 30 or the clip 40 with an opening / closing operation function is moved between the forward movement position and the backward movement position by a sliding operation in the axial direction.

The advance position means that the pusher 30 or the clip 40 with an opening / closing operation function causes the writing portion 21a (or 22a) to protrude from the tip end 11 by the advance slide in the axial direction and is locked in the shaft tube 10. It is the state that was done.
Further, the retracted position means that the pusher 30 or the clip 40 with an opening / closing operation function retracts the writing portion 21a (or 22a) into the distal end port 11 by the backward slide in the axial direction, and the rear end of the presser 30. Or the rear end of the clip support 41 in the clip 40 with the opening / closing operation function is brought into contact with a member 60 to be described later and is stationary.

The shaft cylinder 10 is a long cylindrical member that extends over substantially the entire length of the retractable writing instrument A, and has a front end 11 that has a tapered front end and a writing portion 21a (or 22a) at the front end. Have A plurality of guide holes 12 and 13 for guiding the pusher 30 and the clip 40 with an opening / closing operation function in the axial direction are formed in the peripheral wall on the rear end side of the shaft tube 10. In addition, this axial cylinder 10 may be comprised from an integral cylindrical member, and the structure which connected the several cylindrical member may be sufficient.
According to the illustrated example, the guide hole 12 is a hole for engaging the pusher 30 corresponding to the refill 21 for the ballpoint pen so as to be able to advance and retreat, and the guide hole 13 is engaged so that the clip 40 with an opening / closing operation function can be advanced and retracted. It is a hole for making it. Each of these guide holes 12 and 13 is formed in a substantially long rectangular shape in plan view extending in the axial direction.

Further, a locking portion 14 for engaging the pusher 30 or the clip support 41 of the opening / closing operation function clip 40 located on the inner peripheral surface of the shaft tube 10 in the vicinity of the guide hole 12 or 13. Is formed.
Each locking portion 14 locks the rear end portion of the pusher 30 or the clip support 41 when the pusher 30 or the clip 40 with the opening / closing operation function sinks in the axial direction at the forward movement position. As described above, the shaft tube 10 is formed in a stepped shape on the inner peripheral surface. The locking portions 14 are arranged in a pair so as to sandwich the guide holes 12 or 13 therebetween.

The ballpoint refill 21 includes an ink tank 21b filled with ink, and a writing unit 21a (ballpoint chip) connected to the front end of the ink tank 21b. By the rolling of the transfer ball in the writing unit 21a, The ink in the ink tank 21b is configured to be ejected.
Although not shown, the ball pen refill 21 is made of a plurality of different ink colors such as black, red, and blue. The plurality of ball-point pen refills 21 are radially arranged in cross section on the rear end side of the shaft tube 10.

Further, the mechanical pencil refill 22 includes a writing portion 21a at the front end thereof, and the rear end thereof is connected to the clip support 41 of the clip 40 with an opening / closing operation function.
The mechanical pencil refill 22 is configured so that the lead core is fed out from the writing portion 21a when the opening / closing operation function clip 40 is knocked at the forward movement position.

The ball pen refill 21 and the mechanical pencil refill 22 are urged rearward by an urging member 51a and an urging member 51b, respectively.
The urging member 51a is a coil spring that repels the ballpoint pen refill 21 rearward. As shown in FIG. 4A, the urging member 51a includes end end winding portions 51a1 and 51a1 at both ends in the expansion and contraction direction. An intermediate end turn 51a2 is provided in the approximate center between the end end turns 51a1 and 51a1.
Each of the end winding portions 51a1, 51a1, 51a2 is a portion in which the winding portion constituting the urging member 51a is substantially in close contact with the front and rear, about several turns (for example, 2 to 8 turns).

The urging member 51b is a coil spring that repels the mechanical pencil refill 22 rearward, and has a shape in which the intermediate end winding 51a2 is omitted from the urging member 51a for the ball pen refill 21 described above. End end winding portions 51b1 and 51b1 are provided on both ends in the direction (see FIG. 4B). The urging member 51b is set to have a stronger elasticity (specifically, a set load) than the urging member 51a for the refill 21 for the ballpoint pen.
That is, since the weight of the clip 40 with the opening / closing operation function is larger than that of the pusher 30, the resilient force of the urging member 51b of the mechanical pencil refill 22 is set to be stronger as described above, and the pusher 30 and the opening / closing operation are performed. The balance of operability with the clip with function 40 is made good.

  Further, the presser 30 connected to the rear end of each ballpoint pen refill 21 includes a presser body 31 provided so as to be movable back and forth with respect to the shaft tube 10, and a color identification unit having a color corresponding to the writing color of the writing unit 21a. 32.

The pusher main body 31 engages with the guide hole 12 and advances and retracts, sinks in the shaft tube centripetal direction at the forward movement position, and engages with the locking portions 14 and 14 on both sides of the guide hole 12 on the inner peripheral surface of the shaft cylinder 10. Then, the latched state is formed so as to be released by interference with the other pusher 30 (or the clip support body 41).
The material of the presser body 31 may be a synthetic resin material, and according to a preferred example of the present embodiment, polyacetal (POM) is used.
On the rear end side of the presser main body 31, an operation portion 31a is provided so as to be exposed to the outside of the shaft tube 10. Further, a rearward projection 31b is provided at the rearmost end portion of the pusher body 31 so as to be in contact with a member 60 to be described later.

The protrusion 31b is a protrusion whose cross-sectional area is remarkably reduced as compared with the other part on the rear end side of the pusher 30 so that the contact area when contacting the contacted member 60 is reduced. Yes.
Note that the tip of the protrusion 31b can be formed in a square shape to further reduce the contact area. However, according to a preferred example of the present embodiment, a flat surface having a relatively small area on the protrusion end surface. By using the surface 31b1 (see FIG. 2), the protrusion 31b is prevented from being deformed due to passage or wear.

The clip 40 with the opening / closing operation function is a kind of pusher that advances and retreats in the same manner as the pusher 30 described above.
More specifically, the clip 40 with an opening / closing operation function is swayed with respect to the clip support 41 and a clip support 41 provided so as to advance and retreat with respect to the shaft cylinder 10 in the same manner as the pusher 30. An intermediate support member 42 that is supported, a biasing member 43 (coil spring according to the illustrated example) that biases the rear side of the swing support point in the intermediate support member 42 in the axial tube centrifugal direction, A metal clip portion 44 that is integrally fitted to the support member 42, and the front end side of the clip portion 44 is pivoted when the rear end portion of the clip portion 44 is pressed in the axial tube centripetal direction. When separated from the outer peripheral surface of the cylinder 10 and the pressing force is released, the original state (the state shown in FIG. 1) is restored by the urging force of the urging member 43.

The material of the clip support 41 may be a synthetic resin material like the presser body 31. According to an example of the present embodiment, polyacetal (POM) is used.
The rear end portion of the clip support 41 has a protrusion 41a whose cross-sectional area is remarkably reduced as compared with the other parts, substantially like the protrusion 31b of the pusher 30.

  Note that the above-described pusher body 31 is formed so that only the projection 31b is in a backward contact position at the retracted position. Similarly, the clip support body 41 is also formed so that only the protrusion 41a is in a backward contact position at the retracted position.

  Further, the abutted member 60 has a bottom with the opening directed forward and the bottom directed backward so as to contact the pusher 30 (or the opening / closing operation function clip 40) when sliding backward. A portion that is formed in a cylindrical shape and is in contact with the pusher 30 (or the clip 40 with opening / closing operation function) is formed of a metal material, is immovable in the front-rear direction with respect to the rear end portion of the shaft tube 10, and has a shaft It is fixed so that the rear end of the tube 10 is sealed.

  More specifically, the abutted member 60 includes an annular member 61 that is annularly mounted on the rear end side of the shaft tube 10 so as to abut against the pusher 30 (or the clip support 41), and The bottomed cylindrical part 62 is screwed to the rear end side of the shaft cylinder so as to press the annular member 61 from the rear, and the bottomed cylindrical part 62 is further divided into a cylindrical part 62a and a bottom part 62b. (See FIGS. 2 and 3).

The annular member 61 is formed by processing a metal material into an annular shape. According to a preferred example of the present embodiment, a brass material having a specific gravity of 8.5 is used.
The annular member 61 is annularly attached to the stepped portion on the rear end side of the shaft cylinder 10 and is immovable in the front-rear direction and the circumferential direction by being pressed by a cylindrical part 62a of a bottomed cylindrical part 62 described later. To be fixed.

  The cylindrical portion 62a is formed of a metal material that is the same material as the annular member 61 into a substantially cylindrical shape whose outer diameter is slightly reduced toward the rear, and has an inner circumferential surface that extends to substantially the entire length in the front-rear direction. The female screw portion 62a1 is formed in the inner surface. And the front end side of this female screw part 62a1 is screwed with the rear-end part of the axial cylinder 10, and the bottom part 62b mentioned later is screwed with the rear-end part of the female screw part 62a1.

The bottom portion 62b is formed in a circular lid shape that seals the rear end portion of the cylindrical portion 62a, and the male screw portion 62b1 formed on the outer peripheral surface of the front portion is screwed to the inner peripheral surface of the cylindrical portion 62a. Then, the rear end portion of the cylindrical portion 62a is sealed.
According to a preferred example of the present embodiment, the bottom portion 62b is made of a synthetic resin material (specifically, methyl methacrylate resin (abbreviated as PMMA)), but is made of a brass material similar to the annular member 61 and the cylindrical portion 62a. It is also possible.
Further, as another example of the bottom portion 62b, a configuration in which the bottom portion 62b is connected to the rear end portion of the cylindrical portion 62a by press-fitting or fitting may be employed.

  In addition, a substantially cylindrical eraser 53 is attached to a location on the rear end side of the shaft tube 10 and on the inner side of the contacted member 60. The eraser 53 is fitted into the rear end opening of the shaft tube 10 via a metallic cylindrical spacer 54.

  Reference numeral 52 in the figure denotes an insertion support member that inserts and supports the refill 21 for the ballpoint pen and the refill 22 for the mechanical pencil.

Next, the characteristic operation and effect of the retractable writing instrument A having the above configuration will be described in detail.
When the pusher 30 (or the clip 40 with the opening / closing operation function) is slid forward, the pusher 30 (or the clip 40 with the opening / closing operation function) is locked to the locking portion 14 at the advanced position, and the writing portion 21a (or 22a) protrudes from the front end of the shaft cylinder 10. To maintain.
This locked state is released when the pusher 30 (or the clip 40 with an opening / closing operation function) interferes with another pusher 30 (or the clip 40 with an opening / closing operation function) slid forward. The

The pusher 30 (or the clip 40 with the opening / closing operation function) released from the locked state slides backward by the urging force of the urging member 51, and the protrusion 31b (or 41a) at the rearmost end thereof is brought into contact with the pushing member 30. The member 60 is brought into contact with the front end surface of the annular member 61.
The contact sound at this time is a heavy bass sound that is less disturbing and, more specifically, a sound quality with a relatively low frequency.
This sound quality is attributed to the fact that the abutting members are a synthetic resin material and a projection 31b (41a) having a relatively small cross-sectional area and an annular member 61 made of a brass material.
Furthermore, in a preferred example of the present embodiment, the abutted member 60 has a cylindrical shape with the bottom facing rearward, and the rear end portion of the shaft tube 10 is sealed, so that the contact space 60 is in contact with the sealed space. The sound quality is made more profound by confining the contact sound.

  Furthermore, according to a preferred example of the present embodiment, the eraser 53, which is an elastic body, also has the effect of alleviating the contact sound and vibration during contact.

Furthermore, according to a preferred example of the present embodiment, since the biasing member 51a of the ballpoint pen refill 21 has the intermediate end winding portion 51a2, the pusher 30 is brought into contact with the contacted member 60 by the amplitude of the intermediate end winding portion 51a2. The sound that comes into contact with the sound can be a heavy sound that is relatively low-pitched and slightly lingering.
According to the illustrated example, the urging member 51b on the mechanical pencil refill 22 side is a spring without an intermediate end winding portion. However, the urging member 51a on the mechanical pencil refill 22 side is the same as the urging member 51a. In order to obtain the effect, an intermediate end winding part may be provided.

  Further, according to the illustrated example, the annular member 61, the cylindrical portion 62a, and the bottom portion 62b are configured separately, but as another example, the annular member 61 and the cylindrical portion 62a or the cylindrical portion 62a and the bottom portion 62b are provided. It is also possible to integrally form the same brass material. Furthermore, the three members of the annular member 61, the cylindrical portion 62a, and the bottom portion 62b can be integrally formed of the same brass material.

  Moreover, according to the said embodiment, although the annular member 61 and the cylinder part 62a are coating the thickness of the grade which does not affect the said contact sound on the whole surface, as another example, it is with the pusher 30. Only the contact surface may be omitted to expose the metal material surface, or the entire surface may be omitted to expose the metal material surface. As another example, the contact sound can be made to have a more preferable sound quality by using a paint having an appropriate vibration damping action for the coating.

  Further, according to the above-described embodiment, as a particularly preferable example, substantially the entire peripheral wall portion of the contacted member 60 is formed of a metal material. However, as another example, an embodiment in which only the annular member 61 is formed of a metal material, Also, it is possible to adopt a mode in which only the contact surface side portion of the annular member 61 is formed of a metal material.

Further, according to the above-described embodiment, the protrusion 31 b at the rear end of the pusher 30 can be brought into contact with the contacted member 60, and the protrusion 41 a at the rear end of the clip support 41 is also connected to the contacted member 60. However, as another example, only the protrusion 31b at the rear end of the presser 30 may be brought into contact with the contacted member 60 as in the retractable writing instrument B shown in FIG. Good.
More specifically, the clip support 41 ′ of the clip 40 ′ with the opening / closing operation function in the retractable writing instrument B omits the protrusion 41 a from the above-described clip support 41, and the recess 41 b on the rear end side is replaced with the shaft cylinder 10. It is made to contact | abut to the convex part 15 (synthetic resin part) of the inner rear end side.
That is, in the case of the clip 40 ′ with the opening / closing operation function, the weight is larger than that of the pusher 30 and the metal clip portion 44 is provided, so that the structure is made to contact the metal contacted member 60. A contact sound with a relatively profound feeling can be obtained without this.

Next, the result of the experiment which measured the backward sound of the presser 30 about the retractable writing instrument of the said structure is demonstrated.
(Example)
The Example used for this experiment is the penetrating writing instrument B having the above configuration.
In this retractable writing instrument B, the urging member 51a for urging the presser 30 rearward is a coil spring having an intermediate end winding portion 51a2, for example, as shown in FIG. When the writing unit 21a is in the immersive state, the set load of the coil spring (the biasing member 51a) is about 8.9 g.

(Comparative example)
In the comparative example used in this experiment, as shown in FIG. 9, the front end portion of the synthetic resin pusher 130 is configured to abut against the peripheral wall of the synthetic resin shaft tube 110. A portion indicated by a symbol x in FIG. 9 is a contact portion between the pusher 130 and the shaft tube 110. There is no contact portion on the rear end side of the pusher 130.
In this comparative example, the urging member 151a that urges the pusher 130 rearward is a coil spring having an intermediate end winding portion as shown in FIG. 4A, for example. When the writing unit 21a is in an immersive state, the set load of the coil spring (the biasing member 151a) is about 24g.

(experimental method)
The locked state of the pusher 30 (or 130) in the forward movement position is released by a knocking operation (an operation for projecting the mechanical pencil) of the clip 40 with an opening / closing operation function, and the pusher 30 (or 130) immediately before the releasing operation. Record the sound pressure level change waveform until immediately after). The distance between the device under test (Example or Comparative Example) and the microphone was 30 cm (see FIG. 6).
The microphone, measuring instrument, experiment place, etc. are as follows.
Mike: Type 4190 manufactured by Brüel & Kjær
Preamp: Type 2669 manufactured by Brüel & Kjær
Acoustic analyzer: Type 3560B manufactured by Brüel & Kjær
Experiment place: Anechoic room

(Experimental result)
For the example (the invention of the present application), the sound pressure level waveform shown in FIG. 7 was obtained. In this waveform, the relatively large first peak p1 is considered to be a sound generated by sliding the clip 40 with an opening / closing operation function forward.
The relatively large second peak p <b> 2 is considered to be a sound when the rear end of the presser 30 comes into contact with the contacted member 60.
The relatively large third and subsequent peaks p2 to p7 are considered to be sounds generated when the pusher 30 in contact with the contacted member 60 bounces back and contacts again, and is considered to have been repeated a plurality of times.
The time from the peak p2 due to the first contact to the peak p7 due to the last contact was 20 msec or more.
Auditoryly, the entire contact sound was heard as a relatively long and lingering sound.

For the comparative example, the sound pressure level waveform shown in FIG. 8 was obtained. In this waveform, the relatively large first peak p1 ′ is considered to be a sound generated by a forward slide of a clip with an opening / closing operation function (not shown).
The relatively large second peak p <b> 2 ′ is considered to be a sound when the front end side of the pusher 130 comes into contact with the contact portion x of the peripheral wall of the shaft tube 110.
The relatively large third and subsequent peaks p3 ′ to p4 ′ are considered to be sounds when the pusher 30 bounces back and comes into contact again at the contact point x, and are considered to have been repeated a plurality of times.
The time from the peak p2 ′ due to the first contact to the peak p4 ′ due to the last contact was 20 msec or less, and the number of times of contact was less than in the example.
Hearingly, the entire contact sound was heard as a relatively short and sharp sound.

  In the embodiment, since the time from the peak p2 due to the first contact to the peak p7 due to the last contact is as long as 20 msec or more, the effect of masking the subsequent contact sound by the first contact sound is reduced. Therefore, it is considered that the entire contact sound was heard as a relatively long and lingering sound. (The masking is described in, for example, “E. Zwicker, translated by Yukiko Yamada,“ Psychoacoustics ”, Nishimura Shoten, published in 1992.)

  In the case of the comparative example, since the time from the peak p2 ′ due to the first contact to the peak p4 ′ due to the last contact is as short as 20 msec or less, the subsequent contact sound is strongly masked by the first contact sound. Become. Therefore, it is considered that the entire contact sound was heard as a relatively short and sharp sound.

In the embodiment, the number of rebounds is large, and the time from the peak p2 due to the first contact to the peak p7 due to the last contact is as long as 20 msec or more. The annular member 61 of the contacted member 60 is relatively hard. This is considered to be due to the fact that the metal material is high.
In the above experiment, the coil spring (see FIG. 4A) having the intermediate end winding portion was used in both the example and the comparative example. However, as an example, the coil spring having the intermediate end winding portion (see FIG. 4) is used. 4 (a)) and a coil spring (see FIG. 4 (b)) that does not have an intermediate end winding as a comparative example, the last contact from the peak due to the first contact described above. It can be expected that the time until the peak due to the above will be significantly longer in the embodiment using the coil spring having the intermediate end winding portion.

It is sectional drawing which shows an example of the retractable writing instrument concerning this invention, and has shown omitting the intermediate part. It is a principal part expanded sectional view of the same immersion type writing instrument. 4 is an exploded perspective view of a member to be abutted 60. FIG. It is a front view which shows an example of an urging member to (a) and (b), respectively. It is a principal part expanded sectional view which shows the other example of the retractable type writing instrument concerning this invention. It is the schematic which shows the condition of an operating sound measurement test. It is a graph which shows the time change of the sound pressure level of the operation sound when a pusher retracts about an Example. It is a graph which shows the time change of the sound pressure level of the operation sound when a pusher retracts about a comparative example. It is a principal part front view of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Shaft cylinder 21a, 22a: Writing part 30: Pusher 31b: Protrusion 40: Clip with opening / closing operation function (presser) 41: Clip support body 41a: Protrusion 51: Energizing member 60: Contact member 61: Ring Member 62: Bottomed cylindrical part A: Retractable writing instrument

Claims (5)

The writing part is protruded from the front end of the shaft cylinder by sliding the synthetic resin pusher forward, and the writing part is sunk into the shaft cylinder by sliding the pusher backward by the biasing force of the biasing member. In the haunting type writing instrument that
At the rear end portion of the shaft tube, a bottomed cylindrical contacted member is provided with the opening portion directed forward and the bottom portion directed rearward so as to contact the pusher when sliding backward. ,
The abutted member is formed of a metal material at least at a portion to be abutted by the pusher, is immovable in the front-rear direction with respect to the rear end portion of the shaft tube, and seals the rear end portion of the shaft tube. An in / out type writing instrument characterized by being fixed.   The retractable writing instrument according to claim 1, wherein the contacted member is formed of a metal material in a substantially entire area of a peripheral wall portion thereof.   The contacted member includes an annular member that is annularly mounted on the rear end side of the shaft cylinder so as to be in contact with the pusher, and a screw that is screwed on the rear end side of the shaft cylinder so as to press the annular member from the rear. The retractable writing instrument according to claim 1 or 2, comprising a joined bottomed cylindrical portion.   The retractable writing instrument according to any one of claims 1 to 3, wherein the metal material is a brass material.   5. A retractable writing instrument according to claim 1, wherein a rearward protrusion is provided on a rear end side of the pusher, and a protrusion end of the protrusion is brought into contact with the contacted member. .

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