JP2022073201A - Fitting structure of soft member - Google Patents

Abstract

To provide a fitting structure of a soft member which can fit and remove the soft member easily and can generate a stable and suitable friction without a wobbling of the soft member in friction.SOLUTION: In a fitting structure of a soft member, a fitting hole 331 opened upward in an axial direction is provided at an upper end of a cylindrical body 3, an inward protrusion 332 is formed at an inner peripheral surface of the fitting hole 331, an outer peripheral surface of the soft member 2 comprises a large diameter part 21, a small diameter part 24 provided in line integrally with a lower part of the large diameter part 21 and a shoulder part 23 formed between the large diameter part 21 and the small diameter part 24, an engagement groove 25 including a guide groove 251 opened downward in the axial direction and extending upward in the axial direction and an orthogonal groove 252 orthogonal to an upper end of the guide groove 251 in a circumferential direction are provided at the outer peripheral surface of the small diameter part 24, and when the inward protrusion 332 is engaged with the engagement groove 25 and the soft member 2 is engaged with the cylindrical body 3, the shoulder part 23 abuts onto the upper end of the cylindrical body 3 in the axial direction and a movement of the soft member 2 relative to the cylindrical body 3 in a vertical direction is blocked.SELECTED DRAWING: Figure 4

Description

The present invention relates to a mounting structure for a soft member. More specifically, the present invention relates to a structure for attaching a soft member to the upper end of a cylinder such as a shaft cylinder or a cap of a writing tool.

Patent Document 1 discloses a heat-discolorable writing tool that does not wobble the soft member during friction, enables stable and appropriate friction, and can easily replace the attached soft member with a spare soft member. ing. The configuration of the heat-discolorable writing tool includes a crown, a shaft tube, a soft member, and a preliminary soft member. The first crown mounting portion of the barrel is detachably mounted in the barrel mounting hole of the crown by screwing. The second crown mounting portion of the soft member and the preliminary soft member is detachably mounted in the soft member mounting hole of the crown by screwing. The spare soft member is housed inside the barrel and inside the crown. The soft member is replaceable with a spare soft member. According to the heat-discolorable writing tool, the soft member can be stably and appropriately rubbed without wobbling during friction, and the attached soft member can be easily replaced with a spare soft member or a friction part. can.

Japanese Unexamined Patent Publication No. 2020-69743

However, although the technique disclosed in Patent Document 1 does not require a tool or the like for attaching / detaching the soft member and can be easily attached / detached, it is necessary to rotate the soft member a plurality of times in order to attach / detach by the operation of screwing. There is a risk that the user may find it time-consuming. In addition, if the soft member is not securely screwed to the end due to insufficient rotation amount during screwing, the soft member may loosen or fall off during use, and the soft member may wobble during friction and become stable. There is a risk that proper friction will not be possible.

The present invention has been made in view of the above findings, and does not require a tool or the like for attaching / detaching the soft member, can be easily attached / detached without any trouble, and the soft member can be easily attached / detached during friction. It is to provide a mounting structure of a soft member capable of stable and appropriate friction without wobbling.

The present invention is a mounting structure for a soft member that detachably attaches a soft member to the upper end of a cylinder such as a shaft cylinder or a cap of a writing tool, and has a mounting hole that opens upward in the axial direction at the upper end of the cylinder. An inward protrusion is formed on the inner peripheral surface of the mounting hole, and the outer peripheral surface of the soft member has a large-diameter portion, a small-diameter portion integrally connected below the large-diameter portion, and the large-diameter portion. A shoulder portion formed between the small diameter portion and the small diameter portion, a guide groove that opens downward in the axial direction and extends upward in the axial direction on the outer peripheral surface of the small diameter portion, and a guide groove extending in the upper end portion and the circumferential direction of the guide groove. It is provided with an engaging groove including an orthogonal groove, and when the inward projection is engaged with the engaging groove and the soft member and the cylinder are engaged with each other, the shoulder portion and the upper end of the cylinder are engaged. It is a requirement that the soft member abuts in the axial direction and prevents the soft member from moving in the vertical direction with respect to the tubular body.

According to the present invention, a mounting hole that opens upward in the axial direction is provided at the upper end of the cylinder, an inward protrusion is formed on the inner peripheral surface of the mounting hole, and the outer peripheral surface of the soft member has a large diameter portion and a large diameter portion. It consists of a small-diameter portion that is integrally connected to the lower part of the portion and a shoulder portion that is formed between the large-diameter portion and the small-diameter portion. An engaging groove including an extending guide groove and an orthogonal groove orthogonal to the upper end of the guide groove in the circumferential direction is provided, and the inward projection is engaged with the engaging groove to engage the soft member and the cylinder. , No tools are required to attach / detach the soft member, and it can be easily attached / detached without any trouble. Further, when the inward protrusion is engaged with the engaging groove to engage the soft member and the tubular body, the shoulder portion and the upper end of the tubular body are in axial contact with each other, and the soft member is in the vertical direction with respect to the tubular body. By blocking the movement, the soft member does not wobble during friction, and stable and appropriate friction can be achieved.

Further, the engaging groove includes a fixing groove extending axially upward from the end portion of the orthogonal groove, the depth of the fixing groove is deeper than the depth of the orthogonal groove, and the bottom surface of the fixing groove and the orthogonal groove are formed. It is preferable that a step portion is formed at the boundary of the bottom surface of the.

According to this, even if an inward protrusion is engaged with the fixing groove to engage the soft member and the tubular body and then a force is applied to pull out the soft member upward in the axial direction, the inward protrusion is axially pulled out by the step portion. It is locked and the soft member does not easily move in the axial direction. In addition, the soft member does not wobble during friction, and more stable and appropriate friction can be achieved.

Further, it is preferable that the engaging groove is provided with a dropout prevention groove extending downward in the axial direction from the end portion of the orthogonal groove.

According to this, after engaging the inward protrusion with the fixing groove and engaging the soft member with the tubular body, a large force for pulling out the soft member upward in the axial direction is applied, and the inward protrusion and the step portion pull out in the axial direction. Even if the locking is released, the inward protrusion is engaged with the fall prevention groove. From this state, even if a force in the rotational direction is applied to the soft member, the inward projection does not enter the orthogonal groove, so that the soft member does not fall off from the cylinder. Further, since the fixing groove and the dropout prevention groove are formed on the extension line in the axial direction, even if the axial retaining lock by the inward protrusion and the step portion is released as described above, the soft member is again softened. By applying a downward force in the axial direction to, it is easy to put it in a locking state to prevent it from coming off, and it is possible to easily return it to the normal engaged state between the cylinder and the soft member.

INDUSTRIAL APPLICABILITY The present invention does not require a tool or the like for attaching / detaching a soft member, and can be easily attached / detached without any trouble. In addition, the soft member does not wobble during friction and can perform stable and appropriate friction. A mounting structure can be provided.

It is a front view which shows the writing instrument in embodiment of this invention. It is a perspective view of the soft member of FIG. It is a vertical sectional perspective view of the crown of FIG. It is a perspective view which shows the state before attaching the soft member and a head crown of this embodiment. It is a perspective view which shows the 1st step of attaching a soft member and a head crown of this embodiment. It is a perspective view which shows the 2nd step of attaching a soft member and a head crown of this embodiment. It is a perspective view which shows the 3rd process of attaching a soft member and a head crown of this embodiment. It is a perspective view which shows the state which pulled out the soft member of this embodiment from a head crown.

In the present invention, in the tubular body, "upper" refers to the mounting hole 331 side, and "lower" refers to the opposite side. Further, in the present invention, in the soft member 2, "lower" means the insertion side into the mounting hole 331, and "upper" means the opposite side. Further, in the thermochromic writing tool 1 of the present embodiment, "upper" refers to the soft member side and "lower" refers to the pen tip side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 8 show embodiments of the present invention. FIG. 1 is a front view showing a writing tool according to an embodiment of the present invention, and is a diagram showing a state in which a pen tip 5 (cursive body) is projected. FIG. 2 is a perspective view of the soft member 2 of the present embodiment, and FIG. 3 is a vertical sectional perspective view of the head crown 33 of the present embodiment. FIG. 4 is a perspective view showing a state before mounting the soft member 2 and the head crown 33 of the present embodiment. 5 to 7 are perspective views showing in order the steps of attaching the soft member 2 and the crown 33 of the present embodiment. FIG. 8 is a perspective view showing a state in which the soft member 2 of the present embodiment is pulled out from the crown 33.

The writing tool of the present embodiment shown in FIG. 1 is a haunting type ballpoint pen, and includes a cylinder 3 (in other words, a shaft cylinder) having an opening at the front end. The tubular body 3 has a front shaft 31 made of a tapered cylindrical body, a cylindrical rear shaft 32 attached to the rear end of the front shaft 31 by screwing or fitting, and a rear end of the rear shaft 32. It comprises a cylindrical crown 33 attached to the portion by screwing or fitting. Further, the writing tool of the present embodiment is a heat-changing writing tool 1 having a heat-changing ink inside a cursive (not shown). Inside the cylinder 3, a cursive that can be moved in the axial direction of the cylinder 3 is interchangeably housed. The cursive has an ink storage cylinder on the upper side, and a tip holder and a pen tip 5 are fixed to the lower end of the ink storage cylinder. The tip holder and the pen tip 5 can appear and disappear from the front end opening of the front shaft 31 as the cursive moves.

The appearance mechanism (not shown) of the present embodiment is a side slide type appearance mechanism using a rotary cam mechanism. The haunting mechanism includes a cam portion formed on the upper inner surface of the rear shaft 32, a rotating member that engages with the cam portion and abuts on the rear end of the cursive, and engages with the rotating member and from a slide hole. It is composed of a clip 4 which is an operation unit protruding outward in the radial direction, and a coil spring (for example, a compression coil spring) which is housed in the front shaft 31 and urges the cursive upward. Further, the infestation mechanism of the present embodiment is a double knock type in which both the pen tip protrusion operation and the pen tip immersion operation slide the clip 4 which is an operation unit downward. Specifically, when the clip 4 is slid downward while the cursive is immersed, the cursive is moved downward, and the lower portion (pen tip 5) of the tip holder opens the front shaft 31. Protruding from. Then, the protruding state is maintained by the locking action between the cam portion (not shown) and the rotating member.

When the clip 4 is slid downward while the lower portion of the tip holder is protruding (the state shown in FIG. 1), the locked state between the cam portion and the rotating member (not shown) is released. As a result, the tip holder is returned to the upper side by the action of the coil spring, and the lower portion of the tip holder retracts from the opening of the front shaft 31.

In addition to this, the indentation mechanism is a rear end knock type in which the pen tip appears and disappears by pressing the operation portion provided above the cylinder 3 downward, and the operation portion protruding from the outer surface of the side wall of the cylinder 3 is radially inward. Examples include a side knock type in which the pen tip appears and disappears by pressing the pen tip, and a rotary type in which the pen tip appears and disappears by rotating the operation unit above the cylinder 3.

-Writing body The writing body is composed of a pen tip 5, an ink accommodating tube in which the pen tip 5 is press-fitted and fixed to the front end opening, a heat-discoloring ink filled in the ink accommodating tube, and the heat-discoloring ink. It consists of a follower (for example, a high-viscosity fluid) that is filled at the rear end and advances with the consumption of the heat-discoloring ink. The cursive containing the heat-discoloring ink composition applied to the heat-discoloring writing instrument 1 of the present embodiment is housed in the cylinder 3, but the present invention has a plurality of cursives in the cylinder 3. It can also be applied to a multi-core writing instrument equipped with the cursive.

Examples of the pen tip 5 include a configuration consisting of only a metal ballpoint pen tip rotatably holding a ball at the front end, or a configuration consisting of a synthetic resin pen tip holder holding an upper outer surface of the ballpoint pen tip. Further, a tail plug having a ventilation hole through which the ink storage tube and the outside can be ventilated is attached to the rear end opening of the ink storage tube. Inside the pen tip 5, a spring that presses the ball at the front end downward is housed. The spring has a configuration in which a rod portion is provided at the front end portion of the compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the downward urging of the spring causes the ball to come into close contact with the inner surface of the inwardly facing front end edge of the front end of the ballpoint pen tip, thereby preventing ink leakage and ink evaporation from the front end of the pen tip 5.

-Heat-changing ink In the present invention, the heat-changing ink is preferably a reversible heat-changing ink. The reversible heat-discoloring ink is a heat-decoloring type that decolorizes by heating from the color-developing state, a color memory-preserving type that alternately stores and retains the color-developing state or the decoloring state in a specific temperature range, or heats from the decoloring state. It is possible to configure various types individually or in combination, such as a heating color-developing type that develops a color and returns to a decolorized state by cooling from the color-developed state.

Further, the coloring material contained in the reversible thermochromic ink is conventionally known to cause (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a color reaction of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining a temperature is encapsulated in a microcapsule is preferably used.

-Soft member Hereinafter, the soft member 2 of the present embodiment will be described with reference to FIGS. 2, 4 to 8. The thermochromic writing tool 1 includes a soft member 2. The soft member 2 is detachably provided on the upper end portion of a cylinder 3 such as a shaft cylinder or a cap of a writing tool. A friction portion 22 is provided above the large diameter portion 21 of the soft member 2. In the present embodiment, it is preferable that the soft member 2 has a thermochromic ink built therein and is provided at the rear end of the thermochromic writing instrument 1 capable of ejecting the thermochromic ink from a cursive.

In the present embodiment, the elastic material constituting the soft member 2 is preferably an elastic synthetic resin (rubber, elastomer), for example, a silicone resin, an SBS resin (styrene-butadiene-styrene copolymer), or a SEBS resin (SEBS resin). With styrene-ethylene-butylene-styrene copolymer), fluororesin, chloroprene resin, nitrile resin, polyester resin, ethylenepropylene diene rubber (EPDM) or a mixture of two or more rubber elastic materials, and rubber elastic materials. Examples thereof include a mixture with a synthetic resin. The elastic synthetic resin constituting the soft member 2 is not a highly wear-resistant elastic material (for example, an eraser or the like), but a low-wear elastic material in which almost no wear residue (eraser) is generated during friction is preferable. The soft member 2 can be obtained by combining a writing tool and a friction tool which is a separate member having an arbitrary shape, but by providing the soft member 2 on the writing tool, the portability is excellent.

The soft member 2 may be formed of a mixture of polypropylene resin and styrene-based thermoplastic elastomer, or a mixture of polypropylene resin and polypropylene-based thermoplastic elastomer. A material in which the mixing ratio of the mixture is 1: 1 to 1: 4 by weight, does not contain an abrasive, a plasticizer, or a filler, and the durometer hardness A specified in JIS K6251 is 70 ° to 100 °. It is made of a low-wear elastic material containing no plasticizer and having an erasing ability (erasing rate) of 70% or less for pencil drawn lines specified in JIS S 6050-2002. As a result, the soft member 2 is effective because it is less likely to generate erasing residue when scratched and has excellent thermal discoloration.

The soft member 2 is made of a low-wear elastic material that hardly produces wear debris (erasable debris) when rubbed by the friction portion 22, but gradually wears depending on the type or state of the friction surface or the method of friction. Or it may be damaged. Appropriate friction cannot be achieved with the worn or damaged soft member 2, and the handwriting of the heat-discoloring ink may be rubbed, and the frictional heat generated at that time may make it difficult to thermally discolor the handwriting of the heat-discoloring ink. ..

Further, in the soft member 2, if there is a handwriting written with a pencil or the like on the rubbing surface, or if the rubbing surface is dirty, the residue or dirt on the core of the pencil or the like is transferred to the soft member 2, and the soft member 2 is soft. The member 2 may be soiled. In the soiled soft member 2, when another paper surface or the like is rubbed, the dirt or the like adhering to the soft member 2 may be transferred to the paper surface, and the paper surface may be soiled.

When the soft member 2 is worn, damaged or soiled, it is possible to perform appropriate friction again by replacing the worn, damaged or soiled soft member 2 with a new soft member 2.

As shown in FIG. 2 or 4, the outer peripheral surface of the soft member 2 of the present embodiment has a large diameter portion 21, a small diameter portion 24 integrally connected below the large diameter portion 21, and a large diameter portion 21. A guide groove 251 formed between the small diameter portion 24 and the small diameter portion 24, which opens downward in the axial direction and extends upward in the axial direction on the outer peripheral surface of the small diameter portion 24, and the upper end portion and the circumference of the guide groove 251. An engagement groove 25 including an orthogonal groove 252 orthogonal to the direction is provided. When the inward projection 332 is engaged with the engaging groove 25 and the soft member 2 and the tubular body 3 are engaged with each other, the shoulder portion 23 and the upper end of the tubular body 3 are in axial contact with each other, and the flexible member 3 is soft with respect to the tubular body 3. It is possible to prevent the member 2 from moving in the vertical direction.

Further, in the present embodiment, the engaging groove 25 includes a fixing groove 253 extending axially upward from the end portion of the orthogonal groove 252, and the depth of the fixing groove 253 is deeper than the depth of the orthogonal groove 252, so that the fixing groove 253 A step portion 254 is formed at the boundary between the bottom surface of the surface and the bottom surface of the orthogonal groove 252.

Further, in the present embodiment, the engagement groove 25 includes a dropout prevention groove 255 extending downward in the axial direction from the end portion of the orthogonal groove 252.

Further, in the present embodiment, the height from the bottom surface of the guide groove 251 to the outer diameter of the small diameter portion 24 (in other words, the depth of the guide groove 251) is the height of the inward projection 332 described later (in other words, the inward projection). It is larger than the radial inward length of 332). That is, when the soft member 2 and the tubular body 3 (head crown 33) are engaged with each other, the radial inward tip of the inward projection 332 does not touch the bottom surface of the guide groove 251 or slightly touches the bottom surface. Can be engaged while sliding with almost no resistance. As a result, the inward projection 332 can be easily inserted into the guide groove 251.

Further, in the present embodiment, the height from the bottom surface of the orthogonal groove 252 to the outer diameter of the small diameter portion 24 (in other words, the depth of the orthogonal groove 252) is the height of the inward projection 332 described later (in other words, the inward projection). It is smaller than the radial inward length of 332). That is, when the soft member 2 and the tubular body 3 (head crown 33) are engaged with each other, the radial inner tip of the inward projection 332 slides in contact with the bottom surface of the orthogonal groove 252 with resistance. It can be engaged while. This makes it possible to prevent the inward projection 332 from unexpectedly returning to the guide groove 251 after the soft member 2 is engaged with the tubular body 3. As a result, it is possible to prevent the soft member 2 from falling off.

Further, in the present embodiment, the height from the bottom surface of the fixing groove 253 to the outer diameter of the small diameter portion 24 (in other words, the depth of the fixing groove 253) is the height of the inward projection 332 described later (in other words, the inward projection). It is larger than the radial inward length of 332). That is, the depth of the fixed groove 253 is deeper than the depth of the orthogonal groove 252, and the step portion 254 is formed at the boundary between the bottom surface of the fixed groove 253 and the bottom surface of the orthogonal groove 252. As a result, the radial inward tip portion of the inward projection 332 is locked by the step portion 254, and the engagement between the soft member 2 and the tubular body 3 (head crown 33) is completed. The radial inward tip of the inward projection 332 is locked by the step portion 254 (locking to prevent it from coming off in the axial direction), so that the inward projection 332 does not easily return to the orthogonal groove 252 and is a soft member. 2 and the cylinder 3 can be maintained in a fixed state. When the engagement between the soft member 2 and the tubular body 3 (crown 33) is completed, the radial inward tip of the inward projection 332 does not contact the bottom surface of the fixing groove 253, or is slightly present. It is in contact with.

The soft member 2 preferably has an air flow path in the axial direction. As a result, even if the infant accidentally swallows the soft member 2, the air flow path of the soft member 2 can be ventilated, the airway can be secured, and a suffocation accident can be avoided.

A rotation operation portion including a width across flats portion and a knurled portion may be formed on the outer surface of the large diameter portion 21 of the soft member 2. By gripping and operating the rotation operation unit, the tubular body 3 and the soft member 2 can be easily attached to and detached from each other. Examples of the rotation operation unit include a width across flats such as a hexagon and an octagon that can be hung with a spanner, a knurled portion, and the like.

-Cylindrical body As shown in FIG. 1, the thermochromic writing tool 1 of the present embodiment is attached to a front shaft 31 made of a tapered cylindrical body and a rear end portion of the front shaft 31 by screwing or fitting. A cylindrical body 3 is provided with a cylindrical rear shaft 32, a cylindrical crown 33 attached to the rear end of the rear shaft 32 by screwing or fitting, and a cylindrical body 3. In the present embodiment, as shown in FIG. 3, the crown 33 is connected to the rear end portion (not shown) of the rear shaft 32 by the connecting portion 333 by fitting. At the front end of the front shaft 31, an opening through which the pen tip 5 of the cursive can protrude is formed in the axial direction. The cylinder 3 is made of synthetic resin (for example, polycarbonate or the like) or metal.

As shown in FIGS. 3 and 4, the tubular body 3 is provided with a mounting hole 331 that opens upward in the axial direction at the upper end portion, and an inward projection 332 is formed on the inner peripheral surface of the mounting hole 331. In the present embodiment, the internal hole protrusions are provided at two locations facing each other in the radial direction, but it may be provided at least at one location. The inward projection 332 is engaged with the engaging groove 25 of the soft member 2 described above, and the soft member 2 is mounted on the tubular body 3. When the soft member 2 and the tubular body 3 are engaged with each other, the shoulder portion 23 and the upper end of the tubular body 3 abut in the axial direction, and the flexible member 2 is prevented from moving in the vertical direction with respect to the tubular body 3. .. Further, the tubular body 3 may be a cap of a writing tool. In this case, the mounting hole 331 is formed on the closed end side of the cap.

The thermochromic writing tool 1 having the above configuration operates as follows.

According to the present invention, a mounting hole 331 that opens upward in the axial direction is provided at the upper end of the tubular body 3, an inward projection 332 is formed on the inner peripheral surface of the mounting hole 331, and the outer peripheral surface of the soft member 2 has a large diameter. The outer peripheral surface of the small diameter portion 24 is composed of a portion 21, a small diameter portion 24 integrally connected below the large diameter portion 21, and a shoulder portion 23 formed between the large diameter portion 21 and the small diameter portion 24. The engaging groove 25 is provided with an engaging groove 25 including a guide groove 251 that opens downward in the axial direction and extends upward in the axial direction, and an orthogonal groove 252 that is orthogonal to the upper end portion of the guide groove 251 in the circumferential direction. By engaging the protrusion 332 and engaging the soft member 2 and the tubular body 3, a tool or the like for attaching / detaching the soft member 2 is not required, and the soft member 2 can be easily attached / detached without any trouble. Further, when the inward projection 332 is engaged with the engaging groove 25 to engage the soft member 2 and the tubular body 3, the shoulder portion 23 and the upper end of the tubular body 3 are in axial contact with each other and the tubular body 3 is engaged. By preventing the soft member 2 from moving in the vertical direction with respect to the above, the soft member 2 does not wobble during friction, and stable and appropriate friction can be achieved.

Further, the engaging groove 25 includes a fixing groove 253 extending axially upward from the end portion of the orthogonal groove 252, the depth of the fixing groove 253 is deeper than the depth of the orthogonal groove 252, and the bottom surface of the fixing groove 253 and the orthogonal groove. Since the step portion 254 is formed at the boundary of the bottom surface of the 252, the inward projection 332 is engaged with the fixing groove 253, the soft member 2 and the tubular body 3 are engaged, and then the soft member 2 is pulled out axially upward. Even if a force is applied, the inward projection 332 is locked by the step portion 254 to prevent it from coming off in the axial direction, and the soft member 2 does not easily move in the axial direction. In addition, the soft member 2 does not wobble during friction, and more stable and appropriate friction can be achieved.

Since the engaging groove 25 is provided with a dropout prevention groove 255 extending axially downward from the end portion of the orthogonal groove 252, the inward projection 332 is engaged with the fixing groove 253 and the soft member 2 and the tubular body 3 are engaged with each other. After that, even if a large force for pulling out the soft member 2 upward in the axial direction is applied and the axial retaining lock by the inward protrusion 332 and the step portion 254 is released, the inward protrusion 332 is formed in the fall prevention groove 255. Be engaged. From this state, even if a force in the rotational direction is applied to the soft member 2, the inward projection 332 does not enter the orthogonal groove 252, so that there is no possibility that the soft member 2 will fall off from the tubular body 3. Further, since the fixing groove 253 and the dropout prevention groove 255 are formed on the extension line in the axial direction, even if the inward projection 332 and the stepped portion 254 are released from the axial retaining lock as described above. By applying a downward force in the axial direction to the soft member 2 again, it is easy to put it in a locking state to prevent it from coming off, and it is possible to easily return to the normal engaged state between the tubular body 3 and the soft member 2.

As described above, according to the mounting structure of the soft member 2 of the present invention, no tool or the like for attaching / detaching the soft member 2 is required, the soft member 2 can be easily attached / detached without any trouble, and the soft member 2 can be easily attached / detached during friction. It is possible to provide a mounting structure of a soft member 2 capable of stable and appropriate friction without wobbling.

1 Thermal discoloration writing tool 2 Soft member 21 Large diameter part 22 Friction part 23 Shoulder part 24 Small diameter part 25 Engagement groove 251 Guide groove 252 Orthogonal groove 253 Fixed groove 254 Stepped part 255 Falling prevention groove 3 Cylinder 31 Front shaft 32 Rear shaft 33 Head crown 331 Mounting hole 332 Inward protrusion 333 Connecting part 4 Clip 5 Pen tip

Claims (3)

It is a structure for attaching a soft member to a detachable attachment to the upper end of a cylinder such as a shaft cylinder or a cap of a writing tool.
A mounting hole that opens upward in the axial direction is provided at the upper end of the cylinder, and an inward protrusion is formed on the inner peripheral surface of the mounting hole.
The outer peripheral surface of the soft member is composed of a large-diameter portion, a small-diameter portion integrally connected below the large-diameter portion, and a shoulder portion formed between the large-diameter portion and the small-diameter portion. The outer peripheral surface of the small diameter portion is provided with an engaging groove including a guide groove that opens downward in the axial direction and extends upward in the axial direction, and an orthogonal groove that is orthogonal to the upper end portion of the guide groove in the circumferential direction.
When the introverted protrusion is engaged with the engaging groove to engage the soft member with the tubular body,
A structure for attaching a soft member, characterized in that the shoulder portion and the upper end of the cylinder are in contact with each other in the axial direction, and the soft member is prevented from moving in the vertical direction with respect to the cylinder. The engaging groove includes a fixing groove extending axially upward from the end portion of the orthogonal groove, the depth of the fixing groove is deeper than the depth of the orthogonal groove, and the bottom surface of the fixing groove and the bottom surface of the orthogonal groove are formed. The mounting structure for a soft member according to claim 1, wherein a step portion is formed at the boundary between the two. The soft member mounting structure according to claim 1 or 2, wherein the engaging groove includes a drop-out prevention groove extending downward in the axial direction from the end portion of the orthogonal groove.

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