JP6415149B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument, and more particularly, to a writing instrument that can be switched between a sealed state and a use state by a simple operation without removing a cap from the writing instrument body.

  It is desirable to seal the writing material when not in use so as to prevent volatilization of the ink of the writing material such as a marking pen or contamination of the writing material such as an eraser. Conventionally, a removable cap is often used to seal the writing material. However, the removal of the cap is complicated, and it takes time to switch the writing instrument between the sealed state and the used state. Moreover, the handling of the removed cap is cumbersome and the cap is often lost.

  Therefore, in order to solve these problems, Patent Documents 1 and 2 disclose a writing instrument that can switch the writing instrument between a sealed state and a used state by a simple operation without removing the cap from the writing instrument body. Has been.

  In the writing instrument of Patent Document 1, the slider is moved backward with respect to the writing material by operating a button, and the lid (cap) is swung in conjunction with the movement of the slider by a cam mechanism. Switch between the sealed state and the used state. Moreover, in the writing instrument of patent document 2, the writing instrument is switched between a seal | sticker state and a use state by making a writing material protrude and retract with respect to a shaft cylinder by a pulley mechanism.

Japanese Patent Laid-Open No. 10-100590 JP 2011-143702 A

  However, in the technique of Patent Document 1, since the pen tip protrudes from the slider by moving only the slider without moving the writing material, the writing material is not connected to the slider. For this reason, refill cylinders are used to fix and seal the writing material. This increases the number of parts of the writing instrument.

  Further, since it is difficult to dispose the batting for supplying ink to the small-diameter refill cylinder disposed in the slider, the batting is disposed behind the shaft cylinder. As a result, it is necessary to lengthen the relay core between the nib and the batting, which leads to deterioration in ink followability.

  Further, the button is disposed away from the lid and the pen tip in the axial direction of the shaft cylinder so that the button does not interfere with the lid when the lid is swung. When the button is moved backward to release the seal state of the writing instrument, the distance from the pen tip is further increased. For this reason, in order to write, there is a possibility that the finger that operated the button must once be released from the button and the writing instrument must be held again. This complicates the writing work.

  In the technique of Patent Document 2, since a complicated mechanism such as a pulley is used, the number of parts increases and it is difficult to assemble a writing instrument. Further, since the front end portion of the writing instrument is always open, the sealing performance is insufficient and the ink may volatilize. Furthermore, there is a possibility that the thread member of the pulley mechanism may be cut by long-term use, and the writing instrument may become unusable.

  Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to quickly and easily switch between the sealing state and the use state of the writing instrument with a simple configuration without removing the cap from the writing instrument body. An object of the present invention is to provide a highly durable writing instrument.

  In the first aspect of the present invention, the shaft tube, the slider that moves linearly in the shaft tube, the first writing material that is housed in the slider and is fixed to the slider so that the front end portion projects forward from the slider, A cap that is swingably connected to the slider and configured to seal the front end of the first writing material or release the seal of the front end, and to convert the linear movement of the slider into a swinging motion of the cap A writing instrument comprising a cam mechanism is provided. In addition, the cap side of the writing instrument is defined as the “front” side of the writing instrument, and the opposite side of the writing instrument along the axial direction (longitudinal direction) of the writing instrument is defined as the “rear” side of the writing instrument.

  In the first aspect of the present invention, it is preferable that the writing instrument further includes an operation member connected to the slider and disposed outside the shaft tube.

  In the first aspect of the present invention, the cam mechanism includes a pair of protrusions formed on the cap, a pair of guide holes formed on the slider for guiding the pair of protrusions, and a pair of cam grooves formed on the shaft cylinder. It is preferable to provide a pair of cam grooves that move the protrusion in cooperation with the guide hole so that the cap swings.

  In the first aspect of the present invention, the guide hole includes a straight portion extending in the front-rear direction and a cam portion adjacent to the front of the straight portion, and in a sealed state, the protrusion is positioned at the straight portion and the slider is located at the rear. When the projection moves and reaches the cam portion, the cap preferably swings.

  In the first aspect of the present invention, it is preferable that the cam portion extends while being curved from the straight portion in a direction away from the operation member.

  In the first aspect of the present invention, the operation member is preferably a clip.

  In the first aspect of the present invention, it is preferable that the writing instrument further includes a spring disposed in the shaft cylinder and biasing the slider forward.

  Moreover, in the 1st aspect of this invention, it is preferable that a writing instrument is further equipped with the 2nd writing material arrange | positioned freely in the end part of the axial cylinder on the opposite side of a cap.

  In the first aspect of the present invention, it is preferable that the first writing material is a marking pen and the ink impregnated material impregnated with ink is disposed in the cap.

  According to the present invention, there is provided a highly durable writing instrument that can quickly and easily switch between a sealing state and a use state of the writing instrument with a simple configuration without removing the cap from the writing instrument body.

1A to 1C are a front cross-sectional view, a front view, and a right side view, respectively, of a writing instrument in a sealed state according to the first embodiment of the present invention. 2A and 2B are a front sectional view and a front view, respectively, of the writing state of the writing instrument according to the first embodiment of the present invention. FIG. 3 is a perspective view of the slider and the first operation member of FIG. FIG. 4 is a perspective view of the cap of FIG. FIG. 5 is a front sectional view of the writing instrument in which the ink impregnated material is accommodated in the cap. FIG. 6 is a perspective view of the shaft tube of FIG. FIGS. 7A to 7D are front views of the writing instrument showing how the cap swings. FIGS. 8A to 8D are front sectional views of the writing instrument showing how the cap swings. FIGS. 9A to 9C are a front cross-sectional view, a front view, and a right side view, respectively, of a sealing state of the writing instrument according to the second embodiment of the present invention. 10A and 10B are a front sectional view and a front view, respectively, of the writing state of the writing instrument according to the second embodiment of the present invention.

  Hereinafter, embodiments (first embodiment and second embodiment) of the present invention will be described with reference to the accompanying drawings.

  First, with reference to FIG.1 and FIG.2, the structure and function of the writing instrument 1a which concern on 1st Embodiment of this invention are demonstrated.

  1A to 1C are a front sectional view, a front view, and a right side view, respectively, of a writing instrument 1a in a sealed state according to the first embodiment of the present invention. 2A and 2B are a front sectional view and a front view, respectively, of the writing state of the writing instrument 1a according to the first embodiment of the present invention. The writing instrument 1a includes a first writing member 10 disposed at one end of the shaft tube 3a, and a second writing member 20 disposed at the other end of the shaft tube 3a.

  The first writing member 10 includes a slider 11a partially accommodated in the front portion of the shaft cylinder 3a, a first spring 12 disposed in the shaft cylinder 3a behind the slider 11a, and the slider 11a. A fixed first writing material 13, a first operating member 14 coupled to the slider 11 a, and a cap 15 a disposed at the front end of the writing instrument 1 a are provided. The first spring 12 biases the slider 11a forward. In the present embodiment, the first writing material 13 is a marking pen 13. As shown in FIG. 1 (a), in the present specification, regarding the description of the first writing member 10, the cap 15a side of the writing instrument 1a is defined as the “front” side of the writing instrument 1a, and the axis of the writing instrument 1a. The direction opposite to the cap 15a of the writing instrument 1a along the direction (longitudinal direction) is defined as the “rear” side of the writing instrument 1a.

  When the first operating member 14 is operated, the slider 11a moves linearly within the shaft tube 3a. As shown in FIG. 2, when the slider 11a and the marking pen 13 are moved backward by the first operating member 14 from the sealed state of FIG. 1, the cap 15a is moved in conjunction with the movement of the slider 11a by a cam mechanism described later. Swing. In other words, the cam mechanism converts the linear movement of the slider 11a into a swinging motion of the cap 15a. At this time, the cap 15a swings about 90 ° toward the first operation member 14, and the pen tip 131 of the marking pen 13 is exposed. That is, the seal of the pen tip 131 is released, and the marking pen 13 is ready for writing.

  When the first operation member 14 is released from the writing state of FIG. 2, the slider 11a and the marking pen 13 are moved forward by the biasing force of the first spring 12, and the cap 15a is moved in conjunction with the movement of the slider 11a. Swing. At this time, the cap 15a swings about 90 ° toward the pen tip 131, and the pen tip 131 of the marking pen 13 is sealed as shown in FIG. That is, the marking pen 13 is again in a sealed state. Therefore, when the marking pen 13 is not used, the pen tip 131 is reliably sealed, so that the volatilization of the ink of the marking pen 13 is reduced. In addition, even if it does not hold | maintain the 1st operation member 14, even if the latching | locking part which latches the 1st operation member 14 moved back is provided in the axial cylinder 3a so that the writing state of FIG. 2 can be maintained. Good.

  The second writing member 20 includes a second writing material 23, a second spring 22 disposed in the shaft cylinder 3a so as to surround a part of the second writing material 23, and a second writing material. 23 includes a second operation member 24 that engages with the rear end portion of 23, and a cutler 25 that is attached to the end portion of the shaft cylinder 3a. In the present embodiment, the second writing material 23 is a ballpoint pen 23. The ballpoint pen 23 includes a ballpoint pen tip 231 disposed at the front end portion, and an ink containing tube 232 disposed behind the ballpoint pen tip 231. The second spring 22 biases the ballpoint pen 23 backward. A part of the second operation member 24 is disposed outside the shaft tube 3a so as to be operated by a finger. As shown in FIG. 1 (a), in the present specification, with respect to the description of the second writing member 20, the ball pen tip 231 side of the writing instrument 1a is defined as the “front” side of the writing instrument 1a. The side opposite to the ball-point pen tip 231 of the writing instrument 1a along the axial direction (longitudinal direction) is defined as the “rear” side of the writing instrument 1a.

  When the second operating member 24 is operated from the sealed state of FIG. 1 to move the ballpoint pen 23 forward, the ballpoint pen tip 231 protrudes forward from the shaft cylinder 3a as shown in FIG. That is, the seal of the ballpoint pen tip 231 is released, and the ballpoint pen 23 is ready for writing. At this time, the second operation member 24 and the ballpoint pen 23 are locked in a known manner.

  Further, when the lock of the second operation member 24 is released from the writing state of FIG. 2, the second operation member 24 moves rearward together with the ballpoint pen 23 by the urging force of the second spring 22, and as shown in FIG. In addition, the ballpoint pen tip 231 is immersed in the shaft cylinder 3a. That is, the ballpoint pen 23 is again in a sealed state. In this way, the ballpoint pen 23 is disposed so as to be able to appear and retract at the end of the shaft cylinder 3a opposite to the cap 15a.

  Next, with reference to FIGS. 1-6, each component and the axial cylinder 3a of the 1st writing member 10 are demonstrated in detail.

  As shown in FIGS. 1 and 2, the marking pen 13 includes a pen tip 131 used at the time of writing, a pad 132 containing ink, a relay core 133 that connects the pen tip 131 and the pad 132, and these And a holding unit 134 for holding the. The marking pen 13 is fixed to the slider 11a so that the pen tip 131 protrudes forward from the slider 11a. Therefore, the marking pen 13 moves linearly integrally with the slider 11a. Most of the marking pen 13 is sealed by the slider 11a. Further, as described above, the nib 131 is sealed by the cap 15a when not in use.

  FIG. 3 is a perspective view of the slider 11a and the first operation member 14 of FIG. The slider 11a and the first operating member 14 are typically molded integrally by resin injection molding. The slider 11a has a hollow substantially cylindrical shape, and the rear end portion is closed. A pair of guide holes 111 is formed on the side surface of the slider 11a. The guide hole 111 includes a straight portion 111a extending in the front-rear direction and a cam portion 111b adjacent to the front of the straight portion 111a. The cam portion 111b extends from the straight portion 111a in a direction away from the first operation member 14. A pair of convex portions 112 is formed near the pair of cam portions 111b. The pair of convex portions 112 have a cylindrical shape and project toward the inside in the radial direction of the slider 11a.

  One end of the first operating member 14 is coupled to the slider 11a. As shown in FIGS. 1 and 2, the first operating member 14 is disposed outside the shaft tube 3a so as to be operated by a finger. In the present embodiment, the first operating member 14 is a clip 14 extending in the front-rear direction. As shown in FIGS. 1 and 2, a ball portion 141 that protrudes toward the slider 11 a is formed at the rear portion of the clip 14. The clip 14 cooperates with the outer surface of the shaft cylinder 3a and has a role of holding paper or clothes. The slider 11a and the first operation member 14 may be separately molded and assembled to each other.

  FIG. 4 is a perspective view of the cap 15a of FIG. The cap 15 a includes a seal portion 151 that seals the pen tip 131 and a pair of arm portions 152 that extend rearward from the seal portion 151. The cap 15a is typically formed by resin injection molding. The seal portion 151 is formed in a hollow semispherical shape or a hollow semi-elliptical spherical shape. As shown in FIG. 1A, the pen tip 131 is located in the hollow portion of the seal portion 151 during sealing.

  A pair of protrusions 153 are formed at the distal ends of the pair of arm portions 152. The pair of protrusions 153 protrude perpendicular to the extending direction of the arm portion 152 and away from each other. The pair of protrusions 153 are accommodated in the pair of guide holes 111 of the slider 11a, respectively. The cap 15a is slidably connected to the slider 11a via the protrusion 153. That is, when the slider 11a moves, the guide hole 111 guides the protrusion 153. As shown in FIGS. 1 and 2, the cap 15a seals the pen tip 131 of the marking pen 13 or releases the seal of the pen tip 131 by a swinging motion.

  In addition, a pair of window portions 154 are formed in the pair of arm portions 152. The pair of window portions 154 are formed as through holes and extend along the extending direction of the arm portion 152. Each of the pair of window portions 154 accommodates the convex portion 112 of the slider 11a. When the slider 11a moves, the window portion 154 guides the convex portion 112. Further, as can be seen from FIG. 1B, the user of the writing instrument 1a can check the ink remaining amount of the marking pen 13 through the guide hole 111 (straight portion 111a) of the slider 11a and the window portion 154 of the cap 15a. .

  The ink impregnated material 16 impregnated with ink may be disposed in the cap 15a. FIG. 5 is a front sectional view of the writing instrument 1a in which the ink impregnated material 16 is accommodated in the cap 15a. The ink impregnating material 16 is fixed in the cap 15a by adhesion or the like. The ink impregnating material 16 is a porous material such as a sponge. As shown in FIG. 5, the pen tip 131 contacts the ink impregnating material 16 at the time of sealing. For this reason, even when ink is volatilized and writing becomes impossible due to long-term use, writing can be resumed in a short time by once setting the pen tip 131 in the sealed state.

  FIG. 6 is a perspective view of the shaft cylinder 3a of FIG. The shaft cylinder 3a has a hollow cylindrical shape. The shaft tube 3a is typically formed by resin injection molding. A first escape hole 31 and a second escape hole 32 are formed on the side surface of the shaft cylinder 3a. The first escape hole 31 is disposed at the front end portion of the shaft cylinder 3 a, and the second escape hole 32 is disposed rearwardly spaced from the first escape hole 31. The first escape hole 31 and the second escape hole 32 each extend in the axial direction. As shown in FIGS. 1 and 2, the first operating member 14 is disposed in the first escape hole 31, and the second operating member 24 is disposed in the second escape hole 32. The first operating member 14 and the second operating member 24 can move back and forth without interfering with the shaft cylinder 3a by the first escape hole 31 and the second escape hole 32, respectively. The lengths of the first escape hole 31 and the second escape hole 32 in the axial direction are determined according to the shapes and movement amounts of the first operation member 14 and the second operation member 24, respectively.

  A pair of cam grooves 33 is further formed in a substantially V shape on the side surface of the shaft cylinder 3a. The pair of cam grooves 33 are separated from the first escape hole 31 by about ± 90 ° in the circumferential direction. The pair of cam grooves 33 accommodates the pair of protrusions 153 of the cap 15a.

  As shown in FIGS. 1 (a) and 2 (a), a contact portion 34 that protrudes radially inward and extends in the circumferential direction is formed on the inner surface of the shaft tube 3a. The first spring 12 is disposed between the contact portion 34 and the slider 11a.

  Hereinafter, with reference to FIG.7 and FIG.8, the cam mechanism of the 1st writing member 10 is demonstrated.

  The pair of protrusions 153 of the cap 15a, the pair of guide holes 111 of the slider 11a, and the pair of cam grooves 33 of the shaft cylinder 3a function as a cam mechanism that converts the linear motion of the slider 11a into the swing motion of the cap 15a. To do. 7A to 7D are partial front views of the writing instrument 1a showing how the cap 15a swings. In FIG. 7, the guide hole 111 is indicated by a dotted line. FIGS. 8A to 8D are partial front sectional views of the writing instrument 1a showing how the cap 15a swings. 7 and 8, only the front side of the writing instrument 1a on which the first writing member 10 is disposed is shown.

  FIG. 7A and FIG. 8A show the writing instrument 1a in a sealed state. FIGS. 7A and 8A correspond to FIGS. 1B and 1A, respectively. As shown in FIG. 7A, the protrusion 153 is located at the rear end portion of the straight portion 111 a of the guide hole 111 and at the front end portion of the cam groove 33.

  7B and 8B, the first operation member 14 is moved backward from the sealed state of FIGS. 7A and 8A until the protrusion 153 is positioned at the front end of the straight portion 111a. The writing instrument 1a when moved to is shown. As shown in FIG. 7B, the protrusion 153 is located at the front end portion of the straight portion 111 a of the guide hole 111 and at the front end portion of the cam groove 33. As shown in FIG. 8B, when the first operation member 14 moves rearward, the slider 11a and the marking pen 13 move rearward integrally with the first operation member 14. On the other hand, the cap 15a does not move from the position of FIGS. 7 (a) and 8 (a). That is, the pen tip 131 is separated from the seal portion 151 of the cap 15a.

  FIG.7 (c) and FIG.8 (c) show the writing instrument 1a when the 1st operation member 14 is further moved back from the state of FIG.7 (b) and FIG.8 (b). As shown in FIG. 7C, the protrusion 153 is located on the cam portion 111 b of the guide hole 111. When the protrusion 153 reaches the cam portion 111b, the cam portion 111b and the cam groove 33 cooperate to rotate the protrusion 153 so that the cap 15a swings. As described above, since the cam portion 111b is curved and extends from the straight portion 111a in a direction away from the first operation member 14, the cap 15a swings in a direction approaching the first operation member 14.

  Usually, writing with the marking pen 13 is performed in a state where the first operation member 14 is held rearward with an index finger or a thumb and the side opposite to the first operation member 14 is close to the paper surface in the radial direction of the shaft tube 3a. Done. In this case, the cap 15a swings in a direction approaching the first operation member 14, so that writing is not hindered. Therefore, it is possible to perform writing without holding the writing instrument 1a while holding the first operation member 14 rearward.

  When the cap 15a starts to swing, the seal portion 151 of the cap 15a is sufficiently separated from the pen tip 131, as shown in FIG. For this reason, the cap 15a covers the pen tip 131 in the front-rear direction at the time of sealing, but can swing without interfering with the pen tip 131. The cap 15a covers the pen tip 131 in the front-rear direction at the time of sealing, so that the sealing performance of the pen tip 131 is further enhanced.

  FIGS. 7D and 8D show the writing instrument 1a when the first operating member 14 is further moved backward from the state of FIGS. 7C and 8C. FIGS. 7D and 8D correspond to FIGS. 2B and 2A, respectively. As shown in FIG. 7D, the protrusion 153 is located at the front end portion of the cam portion 111 b of the guide hole 111. Since the protrusion 153 further rotates along the cam groove 33, the cap 15a further swings. As a result, the sealed state is completely released and writing becomes possible.

  Next, with reference to FIG.9 and FIG.10, the writing instrument 1b which concerns on 2nd Embodiment of this invention is demonstrated. In the following description, the same parts as those in the first embodiment will not be described, and different parts from the first embodiment will be mainly described.

  FIGS. 9A to 9C are a front sectional view, a front view, and a right side view, respectively, of a sealed state of the writing instrument 1b according to the second embodiment of the present invention. 10A and 10B are a front sectional view and a front view, respectively, of the writing state of the writing instrument 1b according to the second embodiment of the present invention.

  The writing instrument 1b is fixed to the shaft cylinder 3b, a slider 11b partially accommodated in the front portion of the shaft cylinder 3b, a spring 32 disposed in the shaft cylinder 3b behind the slider 11b, and the slider 11b. A writing material 33, an operating member 34 connected to the slider 11b, a cap 15b disposed at the front end of the writing instrument 1b, and a connecting member 35 connected to the rear end of the shaft tube 3b. The connecting member 35 may be formed integrally with the shaft tube 3b or may be provided separately. 9A, in this specification, the cap 15b side of the writing instrument 1b is defined as the “front” side of the writing instrument 1b, and the writing instrument 1b along the axial direction (longitudinal direction) of the writing instrument 1b. The side opposite to the cap 15b is defined as the “rear” side of the writing instrument 1b.

  An eraser 36 is attached to the front end of the cap 15b. The erasure body 36 is, for example, a friction body for changing or erasing the handwriting by the thermochromic ink, or an eraser. A protrusion 155 is formed at the front end of the cap 15b, while a recess 361 is formed in the eraser 36. The protrusion 155 and the recess 361 have complementary shapes, and the eraser 36 is attached to the cap 15b by fitting or press fitting. The erased body 36 may be attached to the cap 15b by adhesion, welding, or the like. Further, the cap 15b and the eraser 36 may be integrally formed by two-color molding or the like, or may be formed of the same material. When the cap 15b and the eraser 36 are formed of the same material, the material is preferably a material having a durometer hardness A defined by JIS K6251 of 80 ° or more. Although not shown in FIGS. 9 and 10, the ink impregnation material 16 may be disposed in the cap 15b in the same manner as shown in FIG.

  Since the erased body 36 is located at the tip of the cap 15b, it can be used in the sealed state of the writing portion 1b shown in FIG. On the other hand, in the writing state of the writing instrument 1b in which the cap 15b swings together with the erasure body 36 as shown in FIG. 10, the erasure body 36 cannot be used. These two states can be easily switched by the cam mechanism described above with reference to the first embodiment.

  Further, as shown in FIG. 9, the connecting member 35 has a ring shape. By passing a string-like member (not shown) such as a strap or a chain inside the connection member 35, the writing instrument 1b can be attached to another article such as a mobile phone via the string-like member. This improves the portability of the writing instrument 1b and reduces the possibility of losing the writing instrument 1b. Note that the connecting member 35 may have any other shape such as a shape in which a plurality of rings are overlapped or a polygonal shape as long as it can be connected to the string-like member. Further, a magnet may be used for coupling the string-like member and the connection member 35.

  The preferred embodiments according to the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims. For example, the combination of the first writing material and the second writing material is not the marking pen and the ballpoint pen, but the correction pen and the ballpoint pen, the eraser and the mechanical pencil, the eraser and the eraser and the eraser ink, the rubber elastic member and the thermal discoloration. Other combinations such as ink ballpoint pens, thermochromic ink fountain pens and thermochromic ink ballpoint pens, or touch pens and ballpoint pens for tablets may be used. Further, as in the second embodiment, the writing instrument may include only the first writing member without including the second writing member.

DESCRIPTION OF SYMBOLS 1a, 1b Writing tool 3a, 3b Shaft cylinder 31 1st escape hole 32 2nd escape hole 33 Cam groove 34 Contact part 10 1st writing member 11a, 11b Slider 111 Guide hole 111a Straight part 111b Cam part 112 Convex part 12 First spring 13 First writing material (marking pen)
131 Pen tip 132 Filling 133 Relay core 134 Holding part 14 First operation member (clip)
141 Ball portion 15a, 15b Cap 151 Seal portion 152 Arm portion 153 Protrusion 154 Window portion 155 Protrusion portion 16 Ink impregnating material 20 Second writing member 22 Second spring 23 Second writing material (ball pen)
231 Ball-point pen tip 232 Ink storage tube 24 Second operation member 25 Cutler 32 Spring 33 Writing material 34 Operation member 35 Connection member 36 Letter body 361 Concave portion

Claims (2)

A barrel,
A slider that linearly moves in the shaft cylinder;
A first writing material housed in the slider and fixed to the slider such that a front end projects forward from the slider;
A cap coupled to the slider in a swingable manner and configured to seal the front end of the first writing material or to release the seal of the front end;
A cam mechanism for converting the linear movement of the slider into a swinging motion of the cap;
An operation member connected to the slider and disposed outside the shaft tube;
The cam mechanism is
A pair of protrusions formed on the cap;
A pair of guide holes formed in the slider for guiding the pair of protrusions;
A writing instrument, comprising: a pair of cam grooves formed in the shaft cylinder, wherein the pair of cam grooves moves the protrusion in cooperation with the guide hole so that the cap swings. A barrel,
A slider that linearly moves in the shaft cylinder;
A first writing material housed in the slider and fixed to the slider such that a front end projects forward from the slider;
A cap coupled to the slider in a swingable manner and configured to seal the front end of the first writing material or to release the seal of the front end;
A cam mechanism for converting the linear movement of the slider into a swinging motion of the cap;
A clip which is an operation member connected to the slider and disposed outside the shaft cylinder;
A writing instrument in which a front end portion of the cap is equipped with an erasing body for changing or erasing the handwriting by the thermochromic ink.

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