JP6530095B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument.

  The operation section is provided at the rear end of the barrel, and by pushing the operation section forward, the writing state in which the pen tip protrudes from the tip of the barrel and the non-writing state in which the pen tip is sunk into the barrel are switched There is known a writing instrument which is a so-called knock type and contains a thermochromic ink (for example, Patent Document 1). The writing instrument of Patent Document 1 is provided with a friction portion for rubbing the handwriting of the thermochromic ink on the outer surface of the barrel.

WO 2008/105227 pamphlet

  In the writing instrument described in Patent Document 1, in order to switch between the writing state and the non-writing state, it is necessary to hold the writing instrument and operate the operation unit from the state in which the outer peripheral surface of the barrel of the writing instrument is gripped. At the time of this holding operation, the writing instrument may be dropped, which may damage the writing instrument. In addition, it may be bothersome to such a change-over operation.

  An object of the present invention is to provide a writing instrument which can switch between a writing state and a non-writing state more easily.

  According to one aspect of the present invention, there is provided a writing instrument comprising: a barrel; and a writing body slidably disposed in the barrel and having a writing portion at one end, the erasing member, the writing portion Has a writing state protruding from one end of the barrel and a non-writing state in which the writing unit is immersed in the barrel, and an operation unit for switching between the writing state and the non-writing state is provided on the outer surface of the writing tool A writing instrument is provided, characterized in that it is not characterized.

  Further, according to another aspect, the shaft cylinder further includes an advancing and retracting mechanism for a writing unit, and the advancing and retracting mechanism for the writing unit holds or releases the writing body by swinging the writing tool in the axial direction. A writing instrument is provided, characterized in that switching between the writing state and the non-writing state takes place.

  According to another aspect, the erasing member is slidably disposed in the barrel and has an erasing portion at one end, and the erasing portion protrudes from the other end of the barrel and the erasing state. The erasing unit has a non-erasing state in which the erasing unit is immersed in the shaft cylinder, and an operation unit for switching between the erasing state and the non-erasing state is not provided on the outer surface of the writing tool. The retractor mechanism for the erasing unit holds or releases the eraser member by swinging the writing instrument in the axial direction, and switching between the erased state and the non-erased state is further provided. There is provided a writing instrument characterized in that

  Further, according to another aspect, the projecting and retracting mechanism is attached to the ball and the shaft cylinder and accommodates the writing body or the erasing member, and a through hole for accommodating the ball is formed on the side surface. A release portion and a holding portion having a smaller inner diameter than the release portion are disposed slidably in the axial direction of the writing instrument between the cylindrical inner cylinder, the inner peripheral surface of the barrel and the outer peripheral surface of the inner cylinder. And a cylindrical outer sliding member arranged in the axial direction, and attached to the writing body or the erasing member, arranged slidably in the axial direction of the writing tool in the inner cylinder, And a cylindrical inner sliding member having a recess, and by swinging the writing tool in the axial direction, the inner sliding member slides so that the ball is accommodated in the recess, and the outer sliding The member slides and the holding portion and the ball are radially aligned to The inner sliding member is locked together with the ring, and then the outer sliding member slides by swinging the writing tool in the axial direction so that the release portion and the ball are radially aligned and the ball There is also provided a writing instrument characterized in that the inner sliding member is unlocked and the inner sliding member slides so that the ball is disengaged from the recess.

  According to each aspect, the common effect that the writing state and the non-writing state can be switched more easily is achieved.

It is a front view of the writing state of the writing instrument by 1st Embodiment of this invention. It is a longitudinal cross-sectional view in line AA of FIG. It is a longitudinal cross-sectional view of the non-writing state of the writing instrument of FIG. It is a perspective view of the inner cylinder of the writing instrument of FIG. It is a longitudinal cross-sectional view of the inner cylinder of FIG. It is a perspective view of the outer sliding member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the outer sliding member of FIG. It is a perspective view of the inner sliding member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the inner sliding member of FIG. It is a perspective view of the releasing member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the releasing member of FIG. It is a longitudinal cross-sectional view explaining the transition from the non-writing state of the writing instrument of FIG. 1 to a writing state. It is a longitudinal cross-sectional view explaining the transition from the writing state of the writing instrument of FIG. 1 to a non-writing state. It is a front view of the erasure | elimination state of the writing instrument by 2nd Embodiment of this invention. It is a longitudinal cross-sectional view in line BB of FIG. It is a longitudinal cross-sectional view of the non-erased state of the writing instrument of FIG. It is a front view of the writing state of the writing instrument by 3rd Embodiment of this invention. It is a longitudinal cross-sectional view in line CC of FIG. It is a longitudinal cross-sectional view of the non-writing state of the writing instrument of FIG. It is a perspective view of the inner cylinder of the writing instrument of FIG. It is a longitudinal cross-sectional view of the inner cylinder of FIG. It is a perspective view of the outer sliding member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the outer sliding member of FIG. It is a perspective view of the inner sliding member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the inner sliding member of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are given the same reference numerals throughout the drawings.

  FIG. 1 is a front view of a writing state of a writing instrument 1 according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along line A-A of FIG. 1 and FIG. 3 is a writing instrument 1 of FIG. It is a longitudinal cross-sectional view of the non-writing state of.

  The writing instrument 1 has a barrel 2 and an erasing member 3. The barrel 2 has a cylindrical front shaft 4 and a cylindrical rear shaft 5 whose front end is screwed to the rear end of the front shaft 4. At the tip of the front shaft 4 is formed a hole 4 a for causing the writing portion 6 a of the refill 6 which is a writing body accommodated in the shaft cylinder 2 to protrude.

  In the present specification, in the axial direction of the writing instrument 1, the writing unit 6a side is defined as the "front" side, and the opposite side to the writing unit 6a is defined as the "rear" side. Further, “central axis” means the central axis of the writing instrument 1. Furthermore, in the writing instrument 1, the refill 6 slides in the front-rear direction in the barrel 2 by a projection and retraction mechanism described later. At this time, a state where the writing part 6a protrudes from the barrel 2, ie, the hole 4a of the front shaft 4 is referred to as a writing state (FIG. 2), and a state where the writing part 6a is immersed in the barrel 2 is not writing (figure It is called 3).

  A rear wall 5a is formed at the rear end of the rear shaft 5, and a circular mounting opening 5b is formed at the center thereof. Further, the inner wall on the front side of the inner wall near the rear wall 5a of the rear shaft 5 is formed to have a larger inner diameter, and accordingly, the step 5c is formed at the boundary between them. The front shaft 4 and the rear shaft 5 are formed of, for example, a resin material such as polycarbonate resin.

  As the refill 6, a ballpoint pen containing a thermochromic ink, a mechanical pencil containing a thermochromic core, a pen pen containing an eraser erasable ink, a pencil holder, or the like can be used.

  The refill 6 in the present embodiment contains a thermochromic ink. A thermochromic ink maintains a predetermined color (first color) at normal temperature (eg 25 ° C.) and changes to another color (second color) when heated to a predetermined temperature (eg 60 ° C.) After that, when the ink is cooled to a predetermined temperature (e.g., -5 [deg.] C.), the ink has the property of returning to the original color (first color) again. In the writing instrument 1 using the thermochromic ink, to make the second color colorless and to heat the drawn line drawn in the first color (for example red) to make it colorless is referred to as "erasing" here. . Therefore, the erasing member 3 as a friction member rubs against the paper surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line into achromatic, that is, erasing. As a matter of course, the second color may be a color other than colorless.

  The term "erasing" in the present invention refers to adsorption or scraping of drawn lines, characters and the like with an erasing member such as an eraser, in addition to the case where the thermochromic ink is used. Thus, the present invention is also applicable to any writing instrument that erases written lines using an eraser.

  The erasing member 3 is formed in a cylindrical shape as a whole. One end of the erasing member 3 is formed flat, and a mounting projection 3a is formed at the center thereof. The mounting protrusion 3 a is mounted by press-fitting or the like in a mounting opening 5 b formed in the rear wall 5 a of the rear shaft 5. At the other end of the erasing member 3, an erasing portion 3b on a convex curved surface is formed. Furthermore, along the central axis of the erasing member 3, a vent 3 c penetrating the erasing member 3 is formed. With the vent 3 c formed in the erasing member 3, the inside and the outside of the shaft cylinder 2 are in communication with each other. The shape of the erasing member 3 is not particularly limited, and may be, for example, a triangular prism, a rectangular parallelepiped, or a complex shape having asperities and protrusions on the surface.

  As a material for forming the erasing member 3 as a friction body, rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, etc., and rubber such as thermoplastic elastomers such as styrene elastomer, olefin elastomer, polyester elastomer An elastic material, a mixture of two or more rubber elastic materials, a mixture of a rubber elastic material and a synthetic resin, a commercially available eraser, and the like can be mentioned.

  A retracting mechanism is disposed in the barrel 2, particularly in the rear shaft 5. The advancing and retracting mechanism includes an inner cylinder 7, an outer sliding member 8, an inner sliding member 9, a ball 10, a releasing member 11, and a coil spring 13.

  4 is a perspective view of the inner cylinder 7 of the writing instrument 1 of FIG. 1, and FIG. 5 is a longitudinal sectional view of the inner cylinder 7 of FIG. The inner cylinder 7 has a cylindrical inner cylinder main body 7a, a large diameter flange portion 7b, and a small diameter flange portion 7c. The large diameter flange portion 7 b is an annular protrusion formed at the front end portion of the inner cylinder main body 7 a and having a diameter larger than that of the inner cylinder main body 7 a. The small diameter flange portion 7c is formed in the rear of the large diameter flange portion 7b, and is an annular protrusion having a diameter larger than the diameter of the inner cylinder main body 7a and smaller than the diameter of the large diameter flange portion 7b. A through hole 7d is formed on the side surface of the inner cylinder main body 7a. On the inner surface of the large diameter flange portion 7b of the inner cylinder 7, a small diameter portion 7e having an inner surface having a diameter smaller than the inner diameter of the other portion is formed. The inner cylinder 7 is formed of, for example, a resin material such as polycarbonate resin.

  6 is a perspective view of the outer sliding member 8 of the writing instrument 1 of FIG. 1, and FIG. 7 is a longitudinal sectional view of the outer sliding member 8 of FIG. The outer sliding member 8 as a whole is a cylindrical member, and the outer diameter of the outer sliding member 8 is smaller than the inner diameter of the rear shaft 5. On an inner surface of a central portion in the axial direction of the outer sliding member 8, a thick portion 8a which is a holding portion having an inner surface having a diameter smaller than the inner diameter of the other portions is formed. That is, the other portions than the thick portion 8a constitute a thin portion 8b which is a release portion. The inner diameter of the thick portion 8 a of the outer sliding member 8 is larger than the outer diameter of the inner cylinder main body 7 a of the inner cylinder 7 and smaller than the outer diameter of the small diameter flange portion 7 c of the inner cylinder 7. At the front end and the rear end of the thick portion 8a of the outer sliding member 8, a tapered surface 8c, which is an inclined surface continuously connected to the inner surface of the thin portion 8b of the outer sliding member 8, is annularly formed. The outer sliding member 8 is preferably formed of, for example, a metal material such as stainless steel, but may be formed of a resin material or a resin material mixed with metal powder.

  8 is a perspective view of the inner sliding member 9 of the writing instrument 1 of FIG. 1, and FIG. 9 is a longitudinal cross-sectional view of the inner sliding member 9 of FIG. The inner sliding member 9 is a generally cylindrical member having a cylindrical portion 9a and a weight portion 9b. That is, the rear end portion of the inner sliding member 9 is formed solid, and constitutes a weight portion 9b, and the portion ahead of the weight portion 9b is a cylindrical portion 9a. The outer diameter of the inner sliding member 9 is larger than the inner diameter of the small diameter portion 7 e of the inner cylinder 7 and smaller than the inner diameter of the other portion of the inner cylinder 7. An annular recess 9 c is formed on the outer peripheral surface of the weight portion 9 b near the boundary between the cylindrical portion 9 a and the weight portion 9 b. The inner sliding member 9 is preferably formed of, for example, a metal material such as stainless steel having a specific gravity, but may be formed of a resin material, a resin material mixed with metal powder, or a rubber elastic material such as elastomer. good.

  10 is a perspective view of the releasing member 11 of the writing instrument 1 of FIG. 1, and FIG. 11 is a longitudinal sectional view of the releasing member 11 of FIG. The release member 11 has a cylindrical release member main body 11 a and a flange portion 11 b. The flange portion 11 b is an annular protrusion formed at the front end portion of the release member main body 11 a and having a diameter larger than that of the release member main body 11 a. The outer diameter of the flange portion 11 b is smaller than the inner diameter of the rear shaft 5. On the inner surface of the release member main body 11a, a small diameter portion 11c having an inner surface having a diameter smaller than the inner diameter of the other portion is formed. The inner diameter of the small diameter portion 11c of the release member main body 11a is larger than the outer diameter of the inner cylinder main body 7a of the inner cylinder 7 and smaller than the outer diameter of the small diameter flange portion 7c of the inner cylinder 7. The inner diameter of the portion other than the small diameter portion 11 c of the release member main body 11 a is larger than the outer diameter of the small diameter flange portion 7 c of the inner cylinder 7. At the front end and the rear end of the small diameter portion 11c of the release member main body 11a, a tapered surface 11d which is an inclined surface continuously connected to the inner surface of the other part of the release member main body 11a is annularly formed. The release member 11 is preferably formed of, for example, a metal material such as stainless steel, but may be formed of a resin material or a resin material mixed with metal powder.

  The ball 10 is formed in a spherical shape of a size that can be accommodated in the through hole 7d of the inner cylinder 7, and is preferably formed of, for example, a metal material such as stainless steel, but a resin material or a resin mixed with metal powder You may form from a material.

  Referring to FIG. 2 or 3, the coil spring 13, the release member 11, the ball 10 and the outer sliding member 8 are attached to the outside of the inner cylinder main body 7 a of the inner cylinder 7 from the rear of the inner cylinder 7. Be Further, the inner sliding member 9 is attached to the inner side of the inner cylinder 7 from the rear of the inner cylinder 7. In this state, when the retracting mechanism is inserted from the front into the rear shaft 5, the rear end surface of the inner cylinder 7 abuts on the rear wall 5a of the rear shaft 5 and the large diameter flange portion 7b of the inner cylinder 7 and the rear shaft 5 The inner surface of the is fixed by press fitting. The ball 10 is always disposed between the outer sliding member 8 and the inner sliding member 9 in a state of being accommodated in the through hole 7 d of the inner cylinder 7.

  Therefore, the release member 11, the ball 10 and the outer sliding member 8 are slidably disposed between the inner peripheral surface of the rear shaft 5 and the outer peripheral surface of the inner cylinder 7, and the inner sliding of the inner cylinder 7 is performed. The member 9 is slidably disposed. The sliding of the release member 11 is restricted by the elastic force of the coil spring 13 from sliding forward, and the front end face of the outer sliding member 8 is restricted from sliding rearward. The front end of the coil spring 13 is supported by the rear end face of the large diameter flange portion 7 b of the inner cylinder 7. The sliding of the outer sliding member 8 is restricted from sliding forward by the rear end face of the release member 11, and is restricted from sliding rearward by the step 5c of the rear shaft 5. The forward sliding of the inner sliding member 9 is restricted by the rear end face of the small diameter portion 7 e of the inner cylinder 7, and the backward sliding is restricted by the rear wall 5 a of the rear shaft 5.

  The refill 6 is slidably inserted into the cylindrical guide tube 12. The rear end of the guide tube 12 is attached to the front end of the inner cylinder 7 by press fitting. That is, the guide tube 12 is inserted into the inner cylinder 7 until the rear end surface of the guide tube 12 abuts on the front end surface of the small diameter portion 7 e of the inner cylinder 7. Further, the refill 6 is biased rearward by a coil spring 14 disposed in the front shaft 4.

  FIG. 12 is a longitudinal sectional view for explaining the transition from the non-writing state to the writing state of the writing instrument 1 of FIG. (A) of FIG. 12 shows the appearance mechanism when the writing instrument 1 is in the non-writing state. The ball 10 accommodated in the through hole 7 d of the inner cylinder 7 is disposed between the thin portion 8 b of the outer sliding member 8 and the outer peripheral surface of the inner sliding member 9 other than the recess 9 c. In this state, when the writing instrument 1 is moved axially forward and this movement is momentarily stopped, the retracting mechanism inside the writing instrument 1 receives an inertial force in the forward direction. The movement and the instantaneous stop of the writing instrument 1 are performed, for example, by an operation of shaking in the axial direction while holding the writing instrument 1 when writing by the user.

  In the advancing and retracting mechanism that has received the forward inertial force, the inner sliding member 9 slides forward in the inner cylinder 7 together with the refill 6. As a result, the ball 10 is fitted into the recess 9 c of the inner sliding member 9. Then, the outer sliding member 8 slides forward between the rear shaft 5 and the inner cylinder 7, and the tapered surface 8 c abuts on the ball 10. (FIG. 12 (b)).

  Then, the outer sliding member 8 continues sliding as it is due to the inertial force, and is guided by the tapered surface 8c to ride over the ball 10 and lock the inner sliding member 9 together with the ball 10 by the thick portion 8a FIG. 12 (c). That is, the thick portion 8 a of the outer sliding member 8 and the balls 10 are aligned in the radial direction, and the inner sliding member 9 is locked together with the balls 10. At this time, in a state where the writing portion 6a at the tip of the refill 6 protrudes from the hole 4a at the tip of the front shaft 4, the refill 6 is held by the retracting mechanism, and the writing instrument 1 is in the writing state. When writing is performed in this state, a direction in which the inner sliding member 9 slides backward, that is, the thick portion 8 a of the outer sliding member 8 is engaged with the ball 10 and the inner sliding member 9 by writing pressure. Since the force acts in the direction, the writing state is not released.

  FIG. 13 is a longitudinal sectional view for explaining the transition from the writing state to the non-writing state of the writing instrument 1 of FIG. (A) of FIG. 13 shows the advancing and retracting mechanism when the writing instrument 1 is in the writing state. That is, (a) of FIG. 13 shows a state substantially the same as (c) of FIG. In this state, when the writing instrument 1 is moved axially forward and this movement is momentarily stopped, the retracting mechanism inside the writing instrument 1 receives an inertial force in the forward direction. The movement and the instantaneous stop of the writing instrument 1 are performed, for example, by an operation of shaking in the axial direction while holding the writing instrument 1 when writing by the user. Further, at the moment when the writing instrument 1 is moved forward in the axial direction from the stopped state, that is, the moment when the user shakes the writing instrument 1, the advancing and retracting mechanism inside the writing instrument 1 receives the inertial force in the backward direction.

  In the writing instrument 1 in the writing state, the outer sliding member 8 and the inner sliding member 9 are locked together with the ball 10, but the releasing member 11 is in a slidable state. For this reason, when the advancing and retracting mechanism receives an inertial force in the forward direction, the release member 11 slides forward, is resiliently moved by the coil spring 13, and the movement direction is changed to the rear. That is, the release member 11 slides rearward, and the rear end surface collides with the front end surface of the outer sliding member 8. As a result, the outer sliding member 8 slides rearward, and the engagement between the thick portion 8a and the inner sliding member 9 and the ball 10 is released (FIG. 13 (b)). That is, the thin portion 8b and the ball 10 are aligned in the radial direction, the ball 10 is removed from the recess 9c of the inner sliding member 9, and the retention of the refill 6 by the retraction mechanism is released.

  As a result, the inner sliding member 9 slides rearward by the biasing force of the coil spring 14 disposed in the front shaft 4 (FIG. 13 (c)). Therefore, the writing unit 6a at the tip of the refill 6 is inserted into the barrel 2 through the hole 4a at the tip of the front shaft 4, and the writing instrument 1 is in the non-writing state.

  The outer slide member 8 may slide rearward by releasing the inertia force of the projection and retraction mechanism in the backward direction, and the engagement with the inner slide member 9 and the ball 10 may be released. . In this case, the release member 11 can be omitted.

  Further, by adjusting the weight, position, and balance of the weight portion 9b of the inner sliding member 9, the center of gravity of the entire writing instrument 1 can be adjusted to a position most suitable for gripping and writing the writing instrument 1 .

  According to the present invention, it is possible to easily switch the writing state and the non-writing state of the writing instrument 1 simply by swinging the writing instrument 1 in the axial direction. Moreover, since these switching is performed by shaking the writing instrument 1 in the axial direction, there is no need to change the hand holding the holding instrument from the state of holding the outer peripheral surface of the barrel 2 of the writing instrument 1 Nor. Moreover, since these switching is performed by shaking the writing instrument 1 in the axial direction, there is no need to provide an operation part or operation mechanism such as a knock bar on the outer surface of the writing instrument 1, and the design of the writing instrument can be freely designed. be able to.

  FIG. 14 is a front view of the writing instrument 100 in the erased state according to the second embodiment of the present invention, FIG. 15 is a longitudinal sectional view taken along line B-B in FIG. 14, and FIG. 16 is the writing instrument 100 in FIG. It is a longitudinal cross-sectional view of the non-erased state of.

  The writing instrument 100 is a so-called double-ended writing instrument capable of projecting the same or different writing parts from both ends. That is, the writing instrument 100 is composed of the first writing instrument 101 and the second writing instrument 102, and they are connected at the central portion or formed integrally.

  The first writing instrument 101 has a first barrel 110. The first shaft cylinder 110 has a cylindrical first cylindrical member 111 and a cylindrical second cylindrical member 112 whose one end is screwed to one end of the first cylindrical member 111. The second writing instrument 102 has a second barrel 120. The second barrel 120 has a cylindrical first cylindrical member 121 and a cylindrical second cylindrical member 122 whose one end is screwed to one end of the first cylindrical member 121.

  In the first barrel 110 of the first writing instrument 101, the refill 6, which is the writing material of the first embodiment, is accommodated together with the above-mentioned retraction mechanism. Therefore, the writing state and the non-writing state of the first writing instrument 101 can be switched by the principle described with reference to FIGS. 12 and 13.

  In the second barrel 120 of the second writing instrument 102, the erasing member 103 having the same shape as that of the refill 6 which is the writing material of the first embodiment is accommodated together with the above-mentioned retraction mechanism. Therefore, the second writing instrument 102 can be switched between the erased state and the non-erased state according to the principle described with reference to FIGS. 12 and 13. That is, a state in which the erasing portion 103a at the tip of the erasing member 103 protrudes from the first cylindrical member 121 is referred to as an erasing state (FIG. 15), and the erasing portion 103a at the tip of the erasing member 103 is in the first cylindrical member 121. The immersed state is referred to as a non-erased state (FIG. 16).

  In addition, when focusing on the 1st writing instrument 101 or the 2nd writing instrument 102 as a single-piece | unit, a fundamental structure, ie, an appearance mechanism, is respectively the same as the writing instrument 1 of 1st Embodiment. That is, the first writing instrument 101 has the same mechanism for the writing unit as in the first embodiment, and the second writing instrument 102 has the mechanism for the erasing unit. Therefore, the description of each component of each invading mechanism is omitted.

  FIG. 17 is a front view of the writing state of the writing instrument 200 according to the third embodiment of the present invention, FIG. 18 is a longitudinal sectional view taken along line C-C in FIG. It is a longitudinal cross-sectional view of the non-writing state of.

  The writing instrument 200 has a barrel 202 and an erasing member 203. The shaft cylinder 202 has a cylindrical front shaft 204 and a cylindrical rear shaft 205 whose front end portion is screwed to the rear end portion of the front shaft 204. A hole 204 a for forming a writing portion 206 a of the refill 206, which is a writing material accommodated in the barrel 202, is formed at the tip of the front barrel 204.

  In the present specification, in the axial direction of the writing instrument 200, the writing unit 206a side is defined as the "front" side, and the opposite side to the writing unit 206a is defined as the "rear" side, as in the embodiment described above. Further, the “central axis” means the central axis of the writing instrument 200. Further, in the writing instrument 200, the refill 206 slides in the front-rear direction in the shaft cylinder 202 by the protrusion and retraction mechanism described later. At this time, a state where the writing unit 206a protrudes from the barrel 202, that is, the hole 204a of the front shaft 204 is referred to as a writing state (FIG. 18), and a state where the writing unit 206a is immersed in the barrel 202 is not writing (FIG. 19) It is called.

  A rear wall portion 205a is formed at the rear end portion of the rear shaft 205, and a cylindrical projecting portion 205d that protrudes rearward is formed at the center of the rear wall portion 205a. Further, the inner wall on the front side of the inner wall near the rear wall portion 205a of the rear shaft 205 is formed to have a larger inner diameter, and accordingly, the step portion 205c is formed at the boundary portion thereof. The front shaft 204 and the rear shaft 205 are formed of, for example, a resin material such as polycarbonate resin.

  The erasing member 203 is formed in a cylindrical shape as a whole. Further, a through hole 203 c penetrating the erasing member 203 is formed along the central axis of the erasing member 203. One end of the erasing member 203 is formed flat, and a mounting step 203d is formed on the inner wall of the through hole 203c in the vicinity thereof. The erasing member 203 is attached to a projecting portion 205 d formed on the rear wall portion 205 a of the rear shaft 205 by press fitting or the like. As a result, the attachment step portion 203d of the erasing member 203 and the projecting portion 205d of the rear shaft 205 are locked, so that the erasing member 203 is prevented from coming off. At the other end of the erasing member 203, an erasing portion 203b on a convex curved surface is formed. The shape of the erasing member 203 is not particularly limited, and may be, for example, a triangular prism, a rectangular parallelepiped, or a complex shape having asperities and protrusions on the surface.

  A retracting mechanism is disposed in the barrel 202, particularly in the rear shaft 205. The advancing and retracting mechanism includes an inner cylinder 207, an outer sliding member 208, an inner sliding member 209, a ball 10, a coil spring 213, and a weight body 215.

  20 is a perspective view of the inner cylinder 207 of the writing instrument 200 of FIG. 17, and FIG. 21 is a longitudinal sectional view of the inner cylinder 207 of FIG. The inner cylinder 207 has a cylindrical inner cylinder main body 207a, a large diameter flange portion 207b, a medium diameter flange portion 207f, and a small diameter flange portion 207c. The large diameter flange portion 207b is an annular protrusion formed at the front end of the inner cylinder main body 207a and having a diameter larger than that of the inner cylinder main body 207a. The middle diameter flange portion 207f is an annular protrusion formed at the rear of the large diameter flange portion 207b and having a diameter smaller than the diameter of the large diameter flange portion 207b. The small diameter flange portion 207c is formed in the rear of the middle diameter flange portion 207f, and is an annular protrusion having a diameter larger than the diameter of the inner cylinder main body 207a and smaller than the diameter of the middle diameter flange portion 207f. Through holes 207d into which the balls 10 can be inserted are equally formed at three places in the radial direction on the side surface of the inner cylinder main body 207a. A large diameter portion 207g is formed on the inner surface of the front end portion of the inner cylinder 207, and a small diameter portion 207h having an inner diameter smaller than that of the large diameter portion 207g is formed behind the large diameter portion 207g. The inner cylinder 207 is formed of, for example, a resin material such as polycarbonate resin.

  FIG. 22 is a perspective view of the outer sliding member 208 of the writing instrument 200 of FIG. 17, and FIG. 23 is a longitudinal sectional view of the outer sliding member 208 of FIG. The outer sliding member 208 is a cylindrical member as a whole, and the outer diameter of the outer sliding member 208 is smaller than the inner diameter of the rear shaft 205. A thick portion 208 a which is a holding portion is formed on the inner surface of the rear end portion of the outer sliding member 208. The inner surface of the front portion of the thick portion 208a, that is, the inner surface of the front end, has a tapered surface 208c which is an inclined surface whose inner diameter decreases from the front end to the rear and is continuously connected to the front end of the thick portion 208a It is done. The tapered surface 208c is a release portion. The inner diameter of the thick portion 208 a of the outer sliding member 208 is larger than the outer diameter of the inner cylinder main body 207 a of the inner cylinder 207 and smaller than the outer diameter of the small diameter flange portion 207 c of the inner cylinder 207. The outer sliding member 208 is preferably formed of, for example, a metal material such as stainless steel, but may be formed of a resin material or a resin material mixed with metal powder.

  FIG. 24 is a perspective view of the inner sliding member 209 of the writing instrument 200 of FIG. 17, and FIG. 25 is a longitudinal sectional view of the inner sliding member 209 of FIG. The inner sliding member 209 has an inner sliding member main body 209a which is a cylindrical member as a whole. A first flange portion 209b which is an annular protrusion is formed at the rear end of the inner sliding member main body 209a, and an annular projection is formed between the rear end and the front end of the inner sliding member main body 209a. A two flange portion 209c is formed. The outer diameter of the inner sliding member main body 209 a of the inner sliding member 209 is smaller than the inner diameter of the small diameter portion 207 h of the inner cylinder 207. The outer diameters of the first flange portion 209 b and the second flange portion 209 c are larger than the inner diameter of the small diameter portion 207 h of the inner cylinder 207. An annular recess 209 d is formed on the outer peripheral surface of the inner sliding member main body 209 a between the first flange portion 209 b and the second flange portion 209 c.

  At the front end portion of the inner sliding member main body 209a, a plurality of ribs 209e extending in the axial direction are formed. When the front end of the inner sliding member main body 209a is inserted into the rear end of the refill 206, a plurality of ribs 209e press fit. In this state, the rear end face of the refill 206 abuts on the front end face of the second flange portion 209c, but the vent hole 209f is formed in the second flange portion 209c, so that the inside of the refill 206 and the inside of the axial cylinder 202 can be obtained. Communicate. The inner sliding member 209 is preferably formed of, for example, a metal material such as stainless steel having a specific gravity, but may be formed of a resin material, a resin material mixed with metal powder, or a rubber elastic material such as elastomer. good.

  Referring to FIG. 18 or FIG. 19, the inner cylinder 207, the coil spring 213, and the outer sliding member 208 are attached to the outside of the inner sliding member main body 209a of the inner sliding member 209 in this order. Further, the weight body 215 is attached to the rear end portion of the inner sliding member 209. In this state, when the advancing and retracting mechanism is inserted from the front into the rear shaft 205, the large diameter flange portion 207b of the inner cylinder 207 and the inner surface of the rear shaft 205 are fixed by press-fitting. The ball 10 is always disposed between the outer sliding member 208 and the inner sliding member 209 in a state of being accommodated in the through hole 207 d of the inner cylinder 7.

  Therefore, the ball 10 and the outer sliding member 208 are slidably disposed between the inner circumferential surface of the rear shaft 205 and the outer circumferential surface of the inner cylinder 207, and the inner sliding member 209 is disposed in the inner cylinder 207. It is slidably disposed. The sliding of the inner sliding member 209 is restricted from sliding forward by the elastic force of the coil spring 213, and is restricted from sliding backward by the rear wall portion 205a of the rear shaft 205 via the weight body 215. Ru. The front end of the coil spring 213 is supported by the rear end surface of the inner cylinder 207, and the rear end of the coil spring 213 is supported by the front end surface of the first flange portion 209b. The sliding of the outer sliding member 208 is restricted by the rear end face of the small diameter flange portion 207c of the inner cylinder 207 from sliding forward, and the step 205c of the rear shaft 205 is restricted from sliding rearward.

  In the writing instrument 200 in the writing state, the outer sliding member 208 and the inner sliding member 209 are locked together with the ball 10. When the advancing and retracting mechanism receives a backward inertial force, the outer sliding member 208 slides rearward, and the rear end surface collides with the step 5 c of the rear shaft 5. The engagement between the thick portion 208a of the outer sliding member 208 and the inner sliding member 209 and the ball 10 is released. That is, the tapered surface 208c of the outer sliding member 208 and the ball 10 are aligned in the radial direction, the ball 10 is removed from the recess 209d of the inner sliding member 209, and the retention of the refill 206 by the retraction mechanism is released.

  As a result, the biasing force of the coil spring 213 disposed at the outer diameter of the inner sliding member 209 causes the inner sliding member 209 integrated with the refill 206 by press fitting to slide rearward. Therefore, the writing unit 206a at the tip of the refill 206 is inserted into the barrel 202 from the hole 204a at the tip of the leading shaft 204, and the writing instrument 200 is in the non-writing state.

  According to the writing instrument 100 according to the second embodiment of the present invention and the writing instrument 200 according to the third embodiment, the same effect as that of the writing unit 1 according to the first embodiment described above can be obtained. Moreover, by shaking the writing instrument 100 according to the second embodiment, it is possible to switch between the writing and erasing states of the first writing instrument 101 and at the same time switch between the erased and non-erasing states of the second writing instrument 102. Also, the appearance mechanism of the first writing instrument 101 and the second writing instrument 102 may be operated independently by changing the way of swinging or adjusting the weight, the center of gravity, and the like of each member.

DESCRIPTION OF SYMBOLS 1 writing instrument 2 axial cylinder 3 erasure | elimination member 4 tip shaft 5 back shaft 6 refill 6a writing part 7 inner cylinder 8 outer sliding member 9 inner sliding member 10 ball 11 releasing member 12 guide pipe | tube 13 coil spring 14 coil spring

Claims (2)

A writing instrument comprising: a barrel; a writing body disposed in the barrel; and an erasing member slidably disposed in the barrel and having an erasing portion at one end,
An operation unit configured to be switchable between an erased state in which the erasing unit protrudes from one end of the shaft cylinder and a non-erased state in which the erasing unit is recessed in the shaft cylinder, and switches between the erased state and the non-erased state Is not provided on the outer surface of the writing instrument.
The shaft cylinder further comprises an advancing and retracting mechanism for the erasing unit, and the advancing and retracting mechanism for the erasing unit holds or releases the erasing member, whereby the erasing or non-erasing state is achieved
The retractable mechanism, possess a ball, accommodating the erasing member with is attached to the barrel, and a inner cylinder through hole cylindrical shape formed on the side surface for accommodating the ball,
The appearance mechanism is
A cylindrical outer sliding member slidably disposed in an axial direction of the writing instrument between an inner peripheral surface of the barrel and an outer peripheral surface of the inner cylinder;
And a cylindrical inner sliding member attached to the erasing member, slidably disposed in the inner cylinder in the axial direction of the writing instrument, and having a recess in an outer peripheral surface thereof.
On the inner surface of the outer sliding member, there is formed a holding portion having an inner surface having a diameter smaller than the inner diameter of the other portion,
When the inner sliding member slides forward, the ball is accommodated in the recess, and the outer sliding member slides forward to radially align the holding portion and the ball with the ball. Locking the inner sliding member,
Then, when the outer sliding member slides backward, the inner sliding member is released from the engagement with the ball, and the inner sliding member slides backward to release the ball from the recess. And writing instruments. The writing instrument according to claim 1 , wherein an annular tapered surface is formed at the front end of the holding portion.

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