JP2022086573A - Mounting structure of soft member - Google Patents

Abstract

To provide a structure for mounting a soft member so that the soft member can be easily attached and detached, and the soft member can be stably and appropriately rubbed without wobbling during friction.SOLUTION: The mounting structure is provided with a mounting hole 331 that opens upward in the axial direction at the upper end of a cylinder 3. The cylinder 3 includes an engagement groove 332 including a guide groove 332a that opens upward in the axial direction and extends downward in the axial direction and an orthogonal groove 332b that is orthogonal to the lower end of the guide groove 332a in the circumferential direction. The engagement groove is at least radially inward. The outer peripheral surface of the soft member 2 is composed of a large diameter portion 21, a small diameter portion 24 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. An outward protrusion 25 is formed on the outer peripheral surface of the small diameter portion 24. When the outward protrusion 25 is engaged with the engagement groove 332, the shoulder portion 23 and the upper end of the cylinder 3 abut in the axial direction, and the soft member 2 is prevented from moving in the vertical direction with respect to the cylinder 3.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, the soft member can be easily attached / detached without any trouble, and the soft member can be easily attached / detached at the time of friction. It is an object of the present invention to provide a mounting structure for a soft member, which allows the soft member to have 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. The engaging groove is provided with an engaging groove including a guide groove that opens upward in the axial direction and extends downward in the axial direction, and an orthogonal groove that is orthogonal to the lower end portion of the guide groove in the circumferential direction. The outer peripheral surface of the soft member is formed by penetrating at least inward in the radial direction, and the outer peripheral surface thereof includes a large-diameter portion, a small-diameter portion integrally connected below the large-diameter portion, and the large-diameter portion and the small-diameter portion. When an outward protrusion is formed on the outer peripheral surface of the small diameter portion, the outward protrusion is engaged with the engagement groove, and the soft member and the cylinder are engaged with each other. It is a requirement that the shoulder portion and the upper end of the tubular body abut in the axial direction and the soft member is prevented 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, a guide groove that opens upward in the axial direction and extends downward in the axial direction, and a lower end of the guide groove. It is provided with an engaging groove including an orthogonal groove orthogonal to the circumferential direction, the engaging groove is formed at least inward in the radial direction, and the outer peripheral surface of the soft member has a large diameter portion and the large diameter portion. It consists of a small-diameter portion integrally connected downward and a shoulder portion formed between the large-diameter portion and the small-diameter portion, and an outward protrusion is formed on the outer peripheral surface of the small-diameter portion to form an engaging groove. By engaging the outward protrusion with the flexible member and engaging the tubular body, a tool or the like for attaching / detaching the soft member is not required, and the soft member can be easily attached / detached without any trouble. Further, when the outward protrusion is engaged with the engaging groove to engage the soft member with the tubular body, the shoulder portion and the upper end of the tubular body are in axial contact with each other and with respect to the tubular body. By preventing the soft member from moving in the vertical direction, the soft member does not wobble during friction, and stable and appropriate friction can be achieved.

Further, the engaging groove is provided with a fixing groove extending axially upward or downward from the end portion of the orthogonal groove, and at least the orthogonal groove and the fixing groove of the engaging grooves are pierced in the radial direction. Is preferable.

According to this, the outward protrusion is fixed by entering the fixing groove, and the soft member and the tubular body are not unintentionally disengaged, and the soft member easily moves in the axial direction. There is no. In addition, the soft member does not wobble during friction, and more stable and appropriate friction can be achieved during friction. Further, among the engaging grooves, at least the orthogonal groove and the fixing groove are pierced in the radial direction, so that the orthogonal groove and the fixing groove are divided into two or more cavities, which is a so-called split mold. It can be molded with a mold of the so-called type, which facilitates the formation of orthogonal grooves and fixed grooves. In addition, the grooves of the orthogonal groove and the fixing groove can be formed deeper, and the outward protrusions can be reliably engaged.

Further, the vertical width of the orthogonal groove is preferably smaller than the vertical width of the outward protrusion.

According to this, while the outward protrusion passes through the orthogonal groove, the outward protrusion passes in a state of being compressed in the axial direction. After that, when the outward protrusion moves from the orthogonal groove to the fixed groove, the compression in the axial direction of the outward protrusion is released, and the soft member and the cylinder are engaged with each other. That is, after the outward protrusion is engaged with the fixing groove and the soft member and the cylinder are engaged, the outward protrusion does not suddenly return from the fixing groove to the orthogonal groove, and the soft member suddenly falls off from the cylinder. There is no risk of doing so.

Further, the outward protrusion is preferably a columnar protrusion that protrudes outward in the radial direction.

According to this, when the outward protrusion moves from the guide groove to the orthogonal groove, the insertion into the orthogonal groove can be facilitated, and the attachability of the soft member can be improved.

Further, it is preferable that the tubular body is provided with a chamfered portion at a corner portion formed by the guide groove and the orthogonal groove.

According to this, when the outward protrusion moves from the lower end of the guide groove to the orthogonal groove, the insertion resistance becomes small, and the insertion into the orthogonal groove can be facilitated. As a result, the soft member can be easily engaged with the tubular body, and the attachability of the soft member can be improved.

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 thermochromic writing tool in 1st Embodiment of this invention. It is a perspective view of the soft member of 1st Embodiment of this invention. It is a perspective view which shows the crown of the 1st Embodiment of this invention. It is a perspective view which shows the 1st process of attaching a soft member and a head crown of 1st Embodiment of this invention. It is a perspective view which shows the 2nd step of attaching a soft member and a head crown of 1st Embodiment of this invention. It is a perspective view which shows the 3rd step of attaching a soft member and a head crown of 1st Embodiment of this invention. It is a perspective view which shows the 4th process of attaching a soft member and a head crown of 1st Embodiment of this invention. It is a perspective view which shows the crown of the 2nd Embodiment of this invention. It is a perspective view which shows the 1st process which attaches the soft member and the head crown of the 2nd Embodiment of this invention. It is a perspective view which shows the 2nd process of attaching a soft member and a head crown of 2nd Embodiment of this invention. It is a perspective view which shows the 3rd process of attaching a soft member and a head crown of the 2nd Embodiment of this invention. It is a perspective view which shows the 4th process of attaching a soft member and a head crown of 2nd Embodiment of this invention.

In the present invention, in the tubular body 3, "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 5 side.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.

1 to 7 show a first embodiment of the present invention. FIG. 1 is a front view showing a writing tool according to the first 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 first embodiment, and FIG. 3 is a perspective view showing the crown 33 of the first embodiment. 4 to 7 are perspective views showing in order the steps of attaching the soft member 2 and the crown 33 of the present embodiment.

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 5 infests 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 provided in the radial direction. Examples thereof include a side knock type in which the pen tip 5 appears and disappears by pressing the pen tip 5, and a rotary type in which the pen tip 5 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. One writing body containing the heat-changing ink composition applied to the heat-changing writing tool 1 of the present embodiment is housed in the cylinder 3, but the present invention has a plurality of writing bodies in the cylinder 3. It can also be applied to multi-core writing tools 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 coloring 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 temperature is encapsulated in microcapsules is preferably used.

-Soft member The soft member 2 of the present embodiment will be described with reference to FIG. As shown in FIG. 1, 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. As the soft member 2, a writing tool set 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 plasticizer-free, low-wear elastic material having a pencil drawing erasing ability (erasing rate) of 70% or less as defined 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 (erasing 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, 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 and a small diameter portion. It is composed of a shoulder portion 23 formed between the 24 and the small diameter portion 24, and an outward protrusion 25 is formed on the outer peripheral surface of the small diameter portion 24. As a result, when the outward protrusion 25 is engaged with the engaging groove 332, the head crown 33 (cylinder body 3) can be sandwiched between the shoulder portion 23 and the outward protrusion 25, and the soft member 2 and the head crown 33 (cylinder) can be sandwiched. The body 3) can be reliably engaged. In the present embodiment, the outward protrusions 25 are arranged at two positions symmetrically with respect to the axis center, but at least one position may be provided.

Further, as shown in FIG. 2, the outward protrusion 25 is a columnar protrusion that protrudes outward in the radial direction. This facilitates the movement of the outward protrusion 25 in the engagement groove 332 when the outward protrusion 25 is engaged with the engagement groove 332 and the soft member 2 and the crown 33 (cylindrical body 3) are engaged with each other. .. Further, the shape of the outward protrusion 25 may be a shape in which a chamfered portion is provided at a corner portion of a truncated cone shape, a hemispherical shape, or a polygonal columnar shape, in addition to the above-mentioned columnar shape.

The soft member 2 preferably includes 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 may be formed on the outer surface of the large diameter portion 21 of the soft member 2. The rotation operation unit may be, for example, a width across flats such as a hexagon or an octagon that can be wrenched, a knurled portion, or the like. By gripping and operating the rotation operation unit, the rotation operation of the soft member 2 becomes easy, and the head crown 33 (cylinder body 3) and the soft member 2 can be easily attached to and detached.

-Cylinder The cylinder 3 of the present embodiment will be described with reference to FIG. As shown in FIG. 1, the heat-discolorable writing tool 1 of the present embodiment has a cylindrical shape that 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 including a rear shaft 32, a cylindrical crown 33 attached to the rear end of the rear shaft 32 by screwing or fitting, is provided.

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. The cylinder 3 may be a cap for a writing tool. In this case, the mounting hole 331 is formed on the closed end side of the cap.

As shown in FIG. 3, the head crown 33 (cylindrical body 3) is provided with a mounting hole 331 that opens upward in the axial direction at the upper end portion, and has a guide groove 332a that opens upward in the axial direction and extends downward in the axial direction, and a guide groove 332a. The engagement groove 332 including the orthogonal groove 332b orthogonal to the lower end portion in the circumferential direction is provided. Further, the guide groove 332a and the orthogonal groove 332b are formed at least inward in the radial direction. According to this, 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, the orthogonal groove 332b includes a compression unit 332d that compresses the outward protrusion 25 when the outward protrusion 25 passes through.

Further, as shown in FIG. 3, the engaging groove 332 includes a fixed groove 332c extending axially upward from the end portion of the orthogonal groove 332b. According to this, the outward protrusion 25 is fixed by entering the fixing groove 332c, and the soft member 2 is not unintentionally disengaged from the head crown 33 (cylinder body 3), and the soft member 2 is formed. It 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 during friction.

Further, at least the orthogonal groove 332b and the fixing groove 332c of the engaging groove 332 are provided in the radial direction. As a result, the orthogonal groove 332b and the fixed groove 332c can be formed by a mold having a so-called split mold in which the cavity is divided into two or more, and the orthogonal groove 332b and the fixed groove 332c can be formed. It will be easy. Further, the groove of the orthogonal groove 332b and the fixed groove 332c can be formed deeper, and the outward protrusion 25 can be reliably engaged.

Further, as shown in FIG. 3, the vertical width of the orthogonal groove 332b is smaller than the vertical width of the outward protrusion 25. According to this, while the outward protrusion 25 passes through the orthogonal groove 332b, the outward protrusion 25 passes through the orthogonal groove 332b (compression portion 332d) in a state of being compressed in the axial direction. After that, when the outward protrusion 25 moves from the orthogonal groove 332b to the fixed groove 332c, the axial compression of the outward protrusion 25 is released, and the soft member 2 and the crown 33 (cylindrical body 3) are engaged with each other. .. That is, after the outward protrusion 25 is engaged with the fixed groove 332c and the soft member 2 and the crown 33 (cylindrical body 3) are engaged with each other, the outward protrusion 25 suddenly returns from the fixed groove 332c to the orthogonal groove 332b. There is no possibility that the soft member 2 will suddenly fall off from the crown 33 (cylinder body 3).

Further, as shown in FIG. 3, the tubular body 3 is provided with a chamfered portion 332f at a corner portion 332e formed by a guide groove 332a and an orthogonal groove 332b. The chamfered portion refers to a portion where, for example, a C surface, an R surface, or the like is formed. According to this, when the outward protrusion 25 moves from the lower end of the guide groove 332a to the orthogonal groove 332b, the insertion resistance becomes small, and the insertion into the orthogonal groove 332b can be facilitated. As a result, the soft member 2 and the tubular body 3 can be easily engaged with each other, and the attachability of the soft member 2 can be improved.

Further, as shown in FIG. 3, the head crown 33 (cylindrical body 3) is provided with a stepped portion 332g at a second corner portion formed by the orthogonal groove 332b and the fixing groove 332c. As a result, when the soft member 2 and the crown 33 (cylinder body 3) are engaged with each other, a more reliable retaining effect can be obtained, and the soft member 2 can be prevented from falling off unexpectedly. ..

Further, a second chamfered portion may be provided at the second corner portion. As a result, when the outward protrusion 25 is inserted from the fixed groove 332c into the orthogonal groove 332b in order to replace the soft member 2, the insertion resistance becomes small, and the soft member 2 and the crown 33 (when the soft member 2 is replaced) It becomes easy to disengage the engagement with the cylinder 3).

In the present invention, the soft member 2 is mounted on the crown 33 (cylinder body 3) by engaging the engaging groove 332 with the outward protrusion 25 of the soft member 2 described above. When the outward protrusion 25 is engaged with the engaging groove 332 and the soft member 2 and the head crown 33 (cylinder body 3) are engaged with each other, the shoulder portion 23 and the upper end of the head crown 33 (cylinder body 3) are in the axial direction. It is possible to prevent the soft member 2 from moving in the vertical direction with respect to the head crown 33 (cylindrical body 3).

Hereinafter, the steps of mounting the soft member 2 on the crown 33 (cylinder body 3) of the first embodiment will be described in order with reference to FIGS. 4 to 7.

FIG. 4 is a perspective view showing a first step (state before mounting the soft member 2 on the crown 33) of mounting the soft member 2 and the head crown 33 of the first embodiment. As shown in FIG. 4, it shows a state in which the outward protrusion 25 with respect to the axial center and the guide groove 332a are aligned in the rotational direction, and from this state, the outward protrusion 25 of the soft member 2 is attached to the crown 33. It is inserted into the guide groove 332a. It is preferable that the width of the guide groove 332a in the circumferential direction is larger than or substantially the same as the width of the outward protrusion 25 in the circumferential direction. As a result, the outward protrusion 25 can be easily inserted into the guide groove 332a without resistance.

FIG. 5 is a perspective view showing a second step of mounting the soft member 2 and the head crown 33 of the first embodiment. As shown in FIG. 5, it shows a state in which the outward protrusion 25 is completely attached to the guide groove 332a. The outward protrusion 25 is mounted up to the lower end of the guide groove 332a, and the outward protrusion 25 can be moved from the lower end to the orthogonal groove 332b orthogonal to the circumferential direction.

FIG. 6 is a perspective view showing a third step of mounting the soft member 2 and the head crown 33 of the first embodiment. As shown in FIG. 6, it shows a state in which the outward protrusion 25 passes through the orthogonal groove 332b. Since the vertical width of the orthogonal groove 332b is smaller than the vertical width of the outward protrusion 25, the outward protrusion 25 passes through the orthogonal groove 332b (compression portion 332d) in a vertically compressed state. Further, at this time, the shoulder portion 23 and the upper end of the head crown 33 (cylinder body 3) abut in the axial direction.

The tubular body 3 (crown 33) is provided with a chamfered portion 332f at a corner portion 332e formed by a guide groove 332a and an orthogonal groove 332b. As a result, when the outward protrusion 25 is inserted into the orthogonal groove 332b from the lower end of the guide groove 332a, the insertion resistance is reduced, and the outward protrusion 25 can be easily inserted into the orthogonal groove 332b.

FIG. 7 is a perspective view showing a fourth step of mounting the soft member 2 and the crown 33 of the first embodiment. As shown in FIG. 7, the outward protrusion 25 has passed through the orthogonal groove 332b and is moved to the fixed groove 332c, and the shoulder portion 23 and the upper end of the crown 33 (cylinder body 3) are in axial contact with each other, and the soft member 2 It shows the state where the wearing of the crown 33 is completed.

As a result, even when an axially outward force is applied to the soft member 2, the outward protrusion 25 is engaged with the fixing groove 332c, and the soft member 2 does not come off. Further, even when a force in the rotational direction (counterclockwise force when viewed from the soft member side) is applied to the soft member 2, the soft member 2 is provided at the second corner formed by the orthogonal groove 332b and the fixed groove 332c. The stepped portion 332g prevents the outward protrusion 25 from unexpectedly invading the orthogonal groove 332b. As a result, there is no possibility that the soft member 2 will come off unexpectedly.

On the other hand, when the soft member 2 is intentionally removed (that is, when the soft member 2 is replaced with a new soft member), a force in the rotational direction is applied to the soft member 2 to move the outward protrusion 25 from the fixing groove 332c to the orthogonal groove 332b. Move to. After that, the soft member 2 can be removed by moving the outward protrusion 25 from the orthogonal groove 332b to the guide groove 332a.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the form of the head crown 33 (cylindrical body 3) is different from that of the first embodiment. Since the other configurations of the second embodiment are the same as those of the first embodiment, detailed description thereof will be omitted.

8 to 12 show a second embodiment of the present invention. FIG. 8 is a perspective view showing the crown 33 (cylinder body 3) of the second embodiment. 9 to 12 are perspective views showing in order the steps of mounting the soft member 2 and the head crown 33 (cylindrical body 3) of the present embodiment.

As shown in FIG. 8, the engaging groove 332 includes a fixed groove 332c extending downward in the axial direction from the end portion of the orthogonal groove 332b. According to this, the outward protrusion 25 is fixed by entering the fixing groove 332c, and the soft member 2 is not unintentionally disengaged from the head crown 33 (cylinder body 3), and the soft member 2 is formed. It 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 during friction.

Hereinafter, the steps of mounting the soft member 2 on the crown 33 (cylinder body 3) of the second embodiment will be described in order with reference to FIGS. 9 to 12.

FIG. 9 is a perspective view showing a first step (a state before the soft member 2 is attached to the head crown 33) in which the soft member 2 and the head crown 33 (cylindrical body 3) of the second embodiment are attached. As shown in FIG. 9, it shows a state in which the outward protrusion 25 with respect to the axial center and the guide groove 332a are aligned in the rotational direction, and from this state, the outward protrusion 25 of the soft member 2 is attached to the crown 33 ( It is inserted into the guide groove 332a of the cylinder 3). It is preferable that the width of the guide groove 332a in the circumferential direction is larger than or substantially the same as the width of the outward protrusion 25 in the circumferential direction. As a result, the outward protrusion 25 can be easily inserted into the guide groove 332a without resistance.

FIG. 10 is a perspective view showing a second step of mounting the soft member 2 and the head crown 33 (cylindrical body 3) of the second embodiment. As shown in FIG. 10, it shows a state in which the outward protrusion 25 is completely attached to the guide groove 332a. The outward protrusion 25 is mounted up to the lower end of the guide groove 332a, and the outward protrusion 25 can be moved from the lower end to the orthogonal groove 332b orthogonal to the circumferential direction. At this time, the shoulder portion 23 and the upper end of the crown 33 (cylinder body 3) are separated from each other in the axial direction.

FIG. 11 is a perspective view showing a third step of mounting the soft member 2 and the head crown 33 (cylindrical body 3) of the second embodiment. As shown in FIG. 11, it shows a state in which the outward protrusion 25 passes through the orthogonal groove 332b. Since the vertical width of the orthogonal groove 332b is smaller than the vertical width of the outward protrusion 25, the outward protrusion 25 passes through the orthogonal groove 332b (compression portion 332d) in a vertically compressed state. Further, at this time, the shoulder portion 23 and the upper end of the head crown 33 (cylinder body 3) are separated from each other in the axial direction.

The head crown 33 (cylindrical body 3) is provided with a chamfered portion 332f at a corner portion 332e formed by a guide groove 332a and an orthogonal groove 332b. As a result, when the outward protrusion 25 is inserted into the orthogonal groove 332b from the lower end of the guide groove 332a, the insertion resistance is reduced, and the outward protrusion 25 can be easily inserted into the orthogonal groove 332b.

FIG. 12 is a perspective view showing a fourth step of mounting the soft member 2 and the head crown 33 (cylindrical body 3) of the second embodiment. As shown in FIG. 12, the outward protrusion 25 has passed through the orthogonal groove 332b and is moved to the fixed groove 332c, and the shoulder portion 23 and the upper end of the crown 33 (cylinder body 3) are in axial contact with each other, and the soft member 2 And the state where the head crown 33 (cylinder body 3) has been attached is shown. In the state where the soft member 2 and the head crown 33 (cylinder body 3) are completely attached, the shoulder portion 23 and the upper end of the head crown 33 (cylinder body 3) abut in the axial direction.

As a result, even when an axially outward force is applied to the soft member 2, the outward protrusion 25 is engaged with the fixing groove 332c, and the soft member 2 does not come off. Further, even when a force in the rotational direction (counterclockwise force when viewed from the soft member side) is applied to the soft member 2, the soft member 2 is provided at the second corner formed by the orthogonal groove 332b and the fixed groove 332c. The stepped portion 332g prevents the outward protrusion 25 from unexpectedly invading the orthogonal groove 332b. As a result, there is no possibility that the soft member 2 will come off unexpectedly.

On the other hand, when the soft member 2 is intentionally removed (that is, when the soft member 2 is replaced with a new soft member), a force in the rotational direction is applied to the soft member 2 to move the outward protrusion 25 from the fixing groove 332c to the orthogonal groove 332b. Move to. After that, the soft member 2 can be removed by moving the outward protrusion 25 from the orthogonal groove 332b to the guide groove 332a.

The present invention having the above configuration works 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, a guide groove 332a that opens upward in the axial direction and extends downward in the axial direction, and a lower end of the guide groove 332a. An engaging groove 332 including an orthogonal groove 332b orthogonal to the circumferential direction is provided, the engaging groove 332 is penetrated at least inward in the radial direction, and the outer peripheral surface of the soft member 2 is formed by the large diameter portion 21. It is composed of 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, and an outward protrusion 25 is formed on the outer peripheral surface of the small diameter portion 24. By engaging the outward protrusion 25 with the engaging groove 332 and engaging the soft member 2 with the tubular body 3, tools and the like for attaching and detaching the soft member 2 are not required, and it does not take time and effort. The soft member 2 can be easily attached and detached. Further, when the outward protrusion 25 is engaged with the engaging groove 332 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 332 includes a fixing groove 332c extending axially upward or downward from the end portion of the orthogonal groove 332b, and at least the orthogonal groove 332b and the fixing groove 332c of the engaging grooves 332 are provided in the radial direction. According to this, the outward protrusion 25 is fixed by entering the fixing groove 332c, the engagement between the soft member 2 and the tubular body 3 is not unintentionally disengaged, and the soft member 2 is easily axially displaced. It doesn't move. In addition, the soft member 2 does not wobble during friction, and more stable and appropriate friction can be achieved during friction. Further, according to the fact that at least the orthogonal groove 332b and the fixing groove 332c of the engaging groove 332 are pierced in the radial direction, the orthogonal groove 332b and the fixing groove 332c are divided into two or more cavities, so-called splits. It can be molded with a mold of a type called a mold, and the formation of the orthogonal groove 332b and the fixed groove 332c becomes easy. Further, the groove of the orthogonal groove 332b and the fixed groove 332c can be formed deeper, and the outward protrusion 25 can be reliably engaged.

Further, according to the fact that the vertical width of the orthogonal groove 332b is smaller than the vertical width of the outward protrusion 25, the outward protrusion 25 is compressed in the axial direction while the outward protrusion 25 passes through the orthogonal groove 332b. In this state, it passes through the orthogonal groove 332b (compression portion 332d). After that, when the outward protrusion 25 moves from the orthogonal groove 332b to the fixed groove 332c, the axial compression of the outward protrusion 25 is released, and the soft member 2 and the tubular body 3 are engaged with each other. That is, after the outward protrusion 25 is engaged with the fixed groove 332c and the soft member 2 and the tubular body 3 are engaged with each other, the outward protrusion 25 does not suddenly return from the fixed groove 332c to the orthogonal groove 332b, and unexpectedly. There is no possibility that the soft member 2 will fall off from the cylinder 3.

Further, since the outward protrusion 25 is a columnar protrusion protruding outward in the radial direction, it is easy to insert the outward protrusion 25 into the orthogonal groove 332b when the outward protrusion 25 moves from the guide groove 332a to the orthogonal groove 332b. It is possible to improve the mountability of the soft member 2.

Further, the tubular body 3 is provided with the chamfered portion 332f at the corner portion 332e formed by the guide groove 332a and the orthogonal groove 332b, so that the outward projection 25 moves from the lower end portion of the guide groove 332a to the orthogonal groove 332b. At the same time, the insertion resistance is reduced, and the insertion into the orthogonal groove 332b can be facilitated. As a result, the soft member 2 and the tubular body 3 can be easily engaged with each other, and the attachability of the soft member 2 can be improved.

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 Outward protrusion 3 Cylindrical body 31 Front shaft 32 Rear shaft 33 Head crown 331 Mounting hole 332 Engagement groove 332a Guide groove 332b Orthogonal groove 332c Fixed groove 332d Compression part 332e Square part 332f Chamfering part 332g Step part 4 Clip 5 Pen tip

Claims (5)

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 a guide groove that opens upward in the axial direction and extends downward in the axial direction is orthogonal to the lower end of the guide groove in the circumferential direction. An engaging groove including a groove is provided, the engaging groove is penetrated at least in the radial direction, and the outer peripheral surface of the soft member is integrally provided with a large-diameter portion and below the large-diameter portion. It is composed of a small diameter portion to be formed and a shoulder portion formed between the large diameter portion and the small diameter portion, an outward protrusion is formed on the outer peripheral surface of the small diameter portion, and the outward protrusion is engaged in the engaging groove. When the soft member and the cylinder are engaged with each other, the shoulder portion and the upper end of the cylinder are brought into 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. A mounting structure for soft members, which is characterized by being The engaging groove includes a fixing groove extending axially upward or downward from the end portion of the orthogonal groove, and at least the orthogonal groove and the fixing groove of the engaging grooves are pierced in the radial direction. The mounting structure of the soft member described in 1. The mounting structure for a soft member according to claim 1 or 2, wherein the vertical width of the orthogonal groove is smaller than the vertical width of the outward protrusion. The flexible member mounting structure according to any one of claims 1 to 3, wherein the outward protrusion is a columnar protrusion that protrudes outward in the radial direction. The soft member mounting structure according to any one of claims 1 to 4, wherein the tubular body is provided with a chamfered portion at a corner portion formed by the guide groove and the orthogonal groove.

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