JP2022189750A - Mounting structure for soft member - Google Patents

Abstract

To provide a mounting structure for a soft member, regarding a detachable soft member unit, which does not damage the outer surface of a soft member when it is mounted or detached, and which can more firmly attach the soft member while making it more difficult for the soft member to come off than the conventional one.SOLUTION: The mounting structure for a soft member is configured such that a soft member unit 6 is detachably mounted to the upper end of a main body 1 such as a barrel or cap of a writing instrument. The soft member unit 6 includes a soft member 3 and a cover 5. The upper end of the main body 1 is provided with a rod-shaped portion 2 protruding upward. The soft member 3 has a mounting hole 4 opening downward at a lower end thereof. The tubular cover 5 is fixed to the outer surface of the soft member 3. The soft member 3 has a tubular protrusion 31 that protrudes from an opening 51 of the cover 5. The outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 are detachably fitted.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a mounting structure for a soft member.

Conventionally, regarding a thermochromic writing instrument capable of thermally discoloring handwriting by performing a frictional operation using a soft member, Patent Document 1 discloses that the soft member is covered with a cover (crown in Document 1) when not in use. describes a mounting structure for the soft member (the erasing member in Document 1) that can prevent the soft member from being soiled and that can perform the rubbing action of the handwriting immediately after the cover is removed.

JP 2016-97667 A

However, in Patent Document 1, since the projecting portion of the soft member projecting from the cover is fitted to the end portion of the writing instrument, the outer surface of the projecting portion of the soft member is damaged when attaching and detaching, which affects the erasability of handwriting. may affect Furthermore, since the protruding portion is short, a strong attachment cannot be achieved, and there is a risk that the soft member may come off the end of the writing instrument when force is suddenly applied to the cover from the outside.

The present invention solves the above-described conventional problems, and is a mounting structure for a soft member that does not damage the outer surface of the soft member when it is attached or detached, and that allows the soft member to be attached more firmly without being easily detached. is intended to provide In the present invention, in the main body, "upper" refers to the bar-shaped portion side, and "lower" refers to the opposite side. Further, in the present invention, in the soft member, "lower" refers to the insertion side into the rod-shaped portion, and "upper" refers to the opposite side.

A first invention of the present application is a flexible member mounting structure for detachably mounting a soft member unit including a soft member and a cover to the upper end of a main body such as a barrel or a cap of a writing instrument, wherein the upper end of the main body is A rod-shaped portion protruding upward is provided, the lower end of the soft member is provided with a mounting hole that opens downward, a cylindrical cover is fixed to the outer surface of the soft member, and the soft member protrudes from the lower end of the cover. It is characterized by comprising a cylindrical projecting portion, wherein the outer surface of the rod-like portion and the inner surface of the mounting hole are detachably fitted.

The mounting structure for the soft member according to the first invention of the present application does not damage the outer surface of the soft member during attachment and detachment due to the above configuration. Furthermore, since the longitudinal dimension of the fitting portion between the outer surface of the rod-shaped portion and the inner surface of the mounting hole can be ensured to be larger than the longitudinal dimension of the tubular protrusion, even if force is applied to the cover unexpectedly from the outside, the cover remains soft. There is no danger that the member unit will come off.

A second invention of the present application is a flexible member mounting structure according to the first invention, wherein the outer surface of the rod-shaped portion and the inner surface of the mounting hole are fitted together in a state in which the soft member unit is attached to the main body. The cover is positioned radially outward of the joining portion.

According to the second invention of the present application, when the attachment hole of the soft member is attached to the rod-shaped portion, the cover restricts the radial expansion deformation of the soft member, so that the outer surface of the rod-shaped portion and the inner surface of the attachment hole are aligned. Since the fitting portion is pressed radially inward, a larger fitting force can be obtained as compared with the case where only the soft member is fitted to the rod-shaped portion.

A third invention of the present application provides a mounting structure for a soft member according to the second invention, wherein the soft member and the cover are fixed more firmly than the fitting between the rod-shaped portion and the mounting hole. characterized by

A third aspect of the invention of the present application is that, with the above configuration, in a state in which the soft member unit is attached to the main body, the pull-out force of the soft member from the rod-shaped portion (that is, the magnitude of the force required to pull out the soft member from the rod-shaped portion) is reduced. Since the pull-out force of the cover from the soft member (that is, the magnitude of the force required to pull out the cover from the soft member) is larger than the force required to remove the soft member unit from the rod-shaped portion by gripping the cover , the soft member unit can be reliably removed without removing only the cover.

A flexible member mounting structure according to a fourth invention of the present application is, in the third invention, wherein the cover is provided with a ventilation hole communicating with the mounting hole, and the soft member unit is attached to the main body. It is characterized in that it can be mounted from either the upper or lower side.

According to the fourth invention of the present application, when the soft member unit is attached to the main body with the tubular projecting portion facing upward, the barrel is reversed and held like a conventional thermochromic writing instrument. It is possible to perform a frictional operation by pressing, and it is possible to expand the options of the user's method of use.

A flexible member mounting structure according to a fifth aspect of the present invention is the structure according to the third aspect, wherein the upper end of the main body includes a cylindrical side wall portion surrounding the rod-shaped portion, and the soft member unit is attached to the main body. The cylindrical protrusion is accommodated radially inward of the side wall portion in a state in which the side wall portion is closed.

According to the fifth invention of the present application, with the above configuration, the lateral side of the tubular projecting portion is closed by the side wall portion, so that the soft member can be reliably prevented from being soiled.

A sixth invention of the present application is a flexible member mounting structure according to the fifth invention, wherein an outer engaging portion is provided on the outer surface of the rod-shaped portion, an inner engaging portion is provided on the inner surface of the mounting hole, and the main body The outer engaging portion and the inner engaging portion engage with each other when the soft member unit is attached to the.

According to the sixth invention of the present application, the soft member unit is less likely to come off from the main body due to the above configuration.

A flexible member mounting structure according to a seventh invention of the present application is, in the sixth invention, wherein the cover is provided with a ventilation hole communicating with the mounting hole, and the soft member unit is attached to the main body. The soft member unit can be attached from either the upper or lower side, and the outer engaging portion and the inner engaging portion are engaged regardless of whether the soft member unit is attached to the main body from the upper or lower side. .

According to the seventh invention of the present application, the above configuration makes it difficult for the soft member unit to come off from the main body regardless of whether the soft member unit is attached to the main body from above or below.

An eighth invention of the present application is a flexible member mounting structure according to any one of the first to seventh inventions, wherein the main body causes the pen tip to protrude and retract by pressing the upper end of the writing instrument, and the writing state and the non-writing state. An upper end portion of a pressing operation portion of a knock-type writing instrument capable of switching between writing states, wherein the main body is housed inside an outer cylindrical body, which is a shaft cylinder of the knock-type writing instrument, so as to be axially movable. The upper end of the rod-like portion always protrudes upward from the upper end of the outer cylindrical body.

According to the eighth invention of the present application, even when the soft member unit is removed from the main body, the main body can be moved and the pen tip can be retracted by pressing the rod-like portion.

According to the present invention, it is possible to provide a mounting structure for a soft member that does not damage the outer surface of the soft member when it is attached or detached, and that allows the soft member to be attached more firmly without being easily detached.

FIG. 2 is an enlarged vertical cross-sectional view of main parts showing a state in which the main body and the soft member unit are disassembled in the first embodiment of the present invention; FIG. 4 is an enlarged vertical cross-sectional view of a main part showing a state in which the soft member unit is attached to the main body in the first embodiment; FIG. 4 is an enlarged vertical cross-sectional view of a main part showing a state in which the soft member unit is mounted upside down on the main body in the first embodiment; It is a longitudinal section showing a cover in a 1st embodiment. 4 is a perspective view of the soft member unit in the first embodiment; FIG. FIG. 10 is an enlarged front view of a main portion showing a bar-shaped portion according to the second embodiment of the present invention; FIG. 11 is an enlarged front view of a main portion showing a rod-shaped portion according to a third embodiment of the present invention; FIG. 11 is an enlarged vertical cross-sectional view of main parts showing a state in which a main body and a soft member unit are disassembled in a fourth embodiment of the present invention; FIG. 11 is an enlarged vertical cross-sectional view of a main part showing a state in which a soft member unit is attached to a main body in a fourth embodiment; FIG. 11 is an enlarged vertical cross-sectional view of a main part showing a disassembled state of a main body and a soft member unit in a fifth embodiment of the present invention; FIG. 11 is an enlarged vertical cross-sectional view of a main part showing a state in which a soft member unit is attached to a main body in a fifth embodiment; FIG. 11 is a vertical cross-sectional view of a soft member unit in a sixth embodiment; FIG. 14 is a vertical cross-sectional view of a soft member unit in a seventh embodiment; FIG. 20 is a vertical cross-sectional view of a soft member unit in an eighth embodiment; FIG. 21 is a vertical cross-sectional view showing a cover in an eighth embodiment; FIG. 21 is a longitudinal sectional view showing a soft member unit in a ninth embodiment; FIG. 20 is an enlarged vertical cross-sectional view of a main part showing a disassembled state of a main body and a soft member unit in a tenth embodiment of the present invention; FIG. 20 is an enlarged vertical cross-sectional view of a main part showing a state in which the soft member unit is attached to the main body in the tenth embodiment; FIG. 21 is an enlarged vertical cross-sectional view of a main part showing a state in which the soft member unit is mounted upside down on the main body in the tenth embodiment;

Six embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments. 1st Embodiment is a basic form of this invention, 2nd Embodiment thru|or 9th Embodiment are modifications of each component. Each embodiment may be used in combination.

<First embodiment>
1 to 5 show a first embodiment of the present invention.

- Main body The main body 1 is made of synthetic resin (for example, polypropylene or polycarbonate) or metal. Examples of the main body 1 include parts for writing instruments such as a barrel of a writing instrument, a tail plug, and a cap detachably attached to the pen tip side of the barrel. A main body step portion 11 is provided at the upper end of the main body 1 . A rod-shaped portion 2 is formed integrally with the upper end of the main body 1 so as to protrude upward in the axial direction. When the main body 1 is a cap, the rod-shaped part 2 is formed on the closed end side of the cap, and when the main body 1 is a barrel, it is formed on the end opposite to the nib (that is, the tail end of the barrel). It is formed. The bar-shaped portion 2 can be configured by attaching a separate part instead of being formed integrally with the main body 1 .

Rod-shaped part As shown in Fig. 1, the rod-shaped part 2 is a rod-shaped body having a circular cross section and extending in the axial direction. The outer diameter of the rod-shaped portion 2 is set slightly larger than the inner diameter of the mounting hole 4 . In this embodiment, the longitudinal dimension A of the bar-shaped portion 2 is 13 mm.

Preferably, the tip of the bar-shaped portion 2 is chamfered. Chamfering includes, for example, a conical surface and an annular convex curved surface. With the above configuration, insertability of the soft member unit 6 into the rod-shaped portion 2 is improved.

It is preferable not to provide an undercut shape on the outer surface of the bar-shaped portion 2 . The shape of the outer surface of the rod-shaped portion 2 may be, for example, a shape in which the outer diameter becomes smaller toward the top, or a straight shape in which the outer diameter is constant over the axial direction. With the above configuration, when the soft member unit 6 is attached and detached, the rod-shaped portion 2 does not get caught on the inner surface of the mounting hole 4 and can be attached and detached reliably.

As shown in FIG. 2 , the longitudinal dimension A of the rod-shaped portion 2 is greater than the longitudinal dimension B of the cylindrical protrusion 31 and less than or equal to the sum of the longitudinal dimension B of the cylindrical protrusion 31 and the longitudinal dimension D of the inner hole of the cover 5 . Preferably there is (ie B<A≦B+D). It is more preferable that the lower limit of the longitudinal dimension A of the rod-shaped portion 2 is equal to or greater than the sum of half the longitudinal dimension B of the cylindrical projecting portion 31 and the longitudinal dimension D of the inner hole of the cover 5 (that is, B+(D/2) ≦A≦B+D). With the above configuration, the rod-shaped portion 2 can securely hold the soft member unit 6, and the rod-shaped portion 2 does not protrude from the upper end of the soft member unit 6 when attached, so that the appearance of the writing instrument is not spoiled.

Soft member unit FIG. 5 shows a perspective view of the soft member unit 6. As shown in FIG. The soft member unit 6 is composed of the soft member 3 and the cover 5 and is detachably attached to the main body 1 . By gripping the cover 5 , the soft member unit 6 can be frictionally operated using the cylindrical projecting portion 31 .

- Soft member The soft member 3 is integrally formed of an elastic material. As the elastic material, for example, a synthetic resin having rubber elasticity such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene copolymer), or the like is adopted. The soft member 3 rubs the handwriting of the thermochromic ink formed on the paper surface with the pen tip, and heat-discolors the handwriting of the thermochromic ink by the frictional heat generated at that time.

The soft member 3 consists of a tubular body having a circular cross section. The soft member 3 is fixed to the cover 5 while being in contact with the bottom portion 52 of the cover 5 . A mounting hole 4 is provided through the axial center of the soft member 3 in the axial direction. A convex curved surface is formed on the outer peripheral surface of the lower end portion of the soft member 3 . In this embodiment, the outer diameter of the soft member 3 is 7 mm, and the longitudinal dimension C of the entire soft member 3 is 18 mm.

The soft member 3 has a cylindrical protrusion 31 that protrudes from the opening 51 of the cover 5 . In this embodiment, the longitudinal dimension B of the tubular projecting portion 31 is 2 mm.

Mounting hole The inner diameter of the mounting hole 4 is set slightly smaller than the outer diameter of the rod-shaped portion 2 . With the above configuration, the rod-shaped portion 2 and the mounting hole 4 are detachably fitted.

- Cover The cover 5 is made of synthetic resin (for example, polypropylene or polycarbonate) or metal. As shown in FIGS. 1 and 4, the cover 5 is a bottomed cylindrical body having a circular cross section. The cover 5 is fixed to the outer surface of the soft member 3 without gaps. The cover 5 has an opening 51 . A tubular protrusion 31 of the soft member 3 protrudes from the opening 51 . The cover 5 may be fixed to the outer surface of the soft member 3, and may be provided by fitting, press-fitting, engagement, screwing, adhesion, two-color molding, or the like.

A bottom portion 52 of the cover 5 is provided with a ventilation hole 53 that communicates with the mounting hole 4 along the axis. The attachment hole 4 and the ventilation hole 53 can secure an air flow path even if the soft member unit 6 is swallowed by mistake.

The outer surface of the cover 5 may be provided with a non-slip portion such as unevenness, knurling, or the like. With the above configuration, attachment/detachment of the soft member unit 6 and frictional operation are facilitated.

- Mounting state The main body 1 and the soft member unit 6 are detachably mounted. As shown in FIG. 2, when the soft member unit 6 is attached to the main body 1, the main body stepped portion 11 of the main body 1 and the lower end of the soft member 3 come into contact with each other.

By setting the inner diameter of the mounting hole 4 slightly smaller than the outer diameter of the rod-shaped portion 2, the outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 can be reliably fitted.

Since the mounting hole 4 and the ventilation hole 53 communicate in the axial direction, the air inside the mounting hole 4 can be reliably released to the outside without being compressed when the rod-shaped part 2 is fitted into the mounting hole 4. - 特許庁, and attachment of the soft member unit 6 to the main body 1 is facilitated.

As shown in FIG. 3, the inner diameter of the vent hole 53 is larger than the outer diameter of the base of the rod-shaped portion 2 . With the above configuration, the soft member unit 6 can be mounted on the main body 1 by turning it upside down. By mounting the soft member unit 6 with the cylindrical projecting part 31 facing upward, it is possible to reverse the barrel and perform the frictional operation like a conventional thermochromic writing instrument, which allows multiple uses for different users. It is possible to choose a method.

The flexible member mounting structure of this embodiment is a flexible member mounting structure in which a flexible member unit 6 having a soft member 3 and a cover 5 is detachably attached to the upper end of a main body 1 such as a barrel or a cap of a writing instrument. The upper end of the main body 1 is provided with a rod-shaped portion 2 protruding upward, the soft member 3 is provided with a mounting hole 4 opening downward at the lower end, and a cylindrical cover 5 is fixed to the outer surface of the soft member 3, The soft member 3 has a cylindrical projecting portion 31 projecting from the lower end of the cover 5, and the outer surface of the rod-like portion 2 and the inner surface of the mounting hole 4 are detachably fitted, so that the outer surface of the soft member 3 is damaged during attachment and detachment. never Furthermore, since the longitudinal dimension of the fitting portion between the outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 can be ensured to be longer than the longitudinal dimension B of the tubular projecting portion 31, an unexpected force is applied to the cover 5 from the outside. Even if it joins, there is no risk that the soft member unit 6 will come off.

In the flexible member mounting structure of the present embodiment, the cover 5 is positioned radially outward of the outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 while the flexible member unit 6 is mounted on the rod-shaped portion 2 . As a result, when the mounting hole 4 of the soft member 3 is attached to the rod-shaped portion 2 , the radial expansion deformation of the soft member 3 is restricted by the cover 5 , and the outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 are regulated. Since the fitting portion is pressed radially inward, a larger fitting force can be obtained as compared with the case where only the soft member 3 is fitted to the rod-like portion 2 .

In the mounting structure of the soft member according to the present embodiment, the soft member 3 and the cover 5 are fixed more firmly than the fitting between the rod-shaped portion 2 and the mounting hole 4 , so that the soft member 3 is attached to the rod-shaped portion 2 . Since the pull-out force of the soft member 3 with respect to the cover 5 is greater than the pull-out force of the cover 5, when the soft member unit 6 is removed from the rod-shaped portion 2 by gripping the cover 5, only the cover 5 does not come off, and the soft member 3 is securely attached. The member unit 6 can be removed.

In the flexible member mounting structure of the present embodiment, the cover 5 is provided with a ventilation hole 53 that communicates with the mounting hole 4, and the flexible member unit 6 can be attached to the main body 1 from either the upper or lower side. As a result, when the soft member unit 6 is attached to the main body 1 with the cylindrical projecting portion 31 facing upward, the barrel is reversed and the barrel is held to perform the frictional action as in a conventional thermochromic writing instrument. It is possible to do it, and the choice of the usage method of the user can be expanded.

<Second embodiment>
FIG. 6 shows a second embodiment of the invention. 2nd Embodiment is a modification of the rod-shaped part 2 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

Rod-shaped portion As shown in FIG. 6, the surface of the rod-shaped portion 2 is provided with a small-diameter portion 21 at its upper portion. By setting the outer diameter of the small diameter portion 21 to be smaller than the inner diameter of the mounting hole 4, the insertability of the soft member 3 is improved.

Chamfering is preferably provided between the rod-shaped portion 2 and the small-diameter portion 21 .

<Third Embodiment>
FIG. 7 shows a third embodiment of the invention. 3rd Embodiment is a modification of the rod-shaped part 2 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

Rod-shaped portion As shown in Fig. 7, a plurality of longitudinal ribs 22 (four in this embodiment) extending in the axial direction are provided on the surface of the rod-shaped portion 2 in the circumferential direction. The outer diameter of the rod-shaped portion 2 is set smaller than the inner diameter of the mounting hole 4 . The outer diameter of the outer peripheral surface of the vertical rib portion 22 is set slightly larger than the inner diameter of the mounting hole 4 . With the above configuration, the contact area between the rod-shaped portion 2 and the soft member 3 can be reduced, and the force required to attach and detach the soft member unit 6 can be reduced while maintaining an appropriate fitting force.

<Fourth Embodiment>
8 and 9 show a fourth embodiment of the present invention. 4th Embodiment is a modification of the main body 1 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

- Main body The main body 1 is made of synthetic resin (for example, polypropylene or polycarbonate) or metal. The main body 1 is, for example, a barrel of a writing instrument, or a writing instrument part such as a cap detachably attached to the pen tip side of the barrel. A main body step portion 11 is provided at the upper end of the main body 1 . At the upper end of the main body 1, a rod-shaped portion 2 protruding upward in the axial direction and a cylindrical side wall portion 7 surrounding the rod-shaped portion 2 are integrally formed. When the main body 1 is a cap, the rod-shaped part 2 is formed on the closed end side of the cap, and when the main body 1 is a barrel, it is formed on the end opposite to the nib (that is, the tail end of the barrel). It is formed. The rod-shaped portion 2 and the side wall portion 7 can be configured by attaching separate parts instead of being formed integrally with the main body 1 .

Rod-shaped portion As shown in FIG. 8, the longitudinal dimension A of the rod-shaped portion 2 is greater than the height E of the side wall portion 7 in the axial direction. That is, the rod-shaped portion 2 protrudes upward from the upper end of the side wall portion 7 . With the above configuration, when the soft member unit 6 is attached to the main body 1 , the cover 5 is reliably positioned radially outward of the fitting portion between the outer surface of the rod-shaped portion 2 and the inner surface of the mounting hole 4 . Furthermore, when attaching the soft member unit 6 to the main body 1, even if the insertion is started at a position deviated from the axis of the main body 1, the rod-shaped portion 2 functions as a positioning, and the tubular projecting portion 31 reaches the side wall portion 7. Since the tubular protrusion 31 moves to the axial center before it is moved, the tubular protrusion 31 does not come into contact with the side wall portion 7 and the outer surface of the soft member 3 is not damaged.

- Side wall portion The inner diameter of the side wall portion 7 is larger than the outer diameter of the cylindrical projecting portion 31 and smaller than the outer diameter of the cover 5 . The axial height E of the side wall portion 7 is greater than the longitudinal dimension B of the tubular projecting portion 31 . With this configuration, the inner surface of the cylindrical side wall portion 7 and the outer surface of the cylindrical protruding portion 31 are maintained in a non-contact state, so that the outer surface of the soft member 3 is not damaged during attachment and detachment.

- Mounting state The main body 1 and the soft member unit 6 are detachably mounted. As shown in FIG. 9, with the soft member unit 6 attached to the main body 1, the upper end of the side wall portion 7 and the lower end of the cover 5 are in contact with each other. With this configuration, the lateral side of the tubular projecting portion 31 is closed by the side wall portion 7 , so that the soft member 3 can be reliably prevented from being soiled while the soft member unit 6 is attached to the main body 1 .

As in the first embodiment, if the inner diameter of the vent hole 53 is larger than the outer diameter of the base of the rod-shaped portion 2, the flexible member unit 6 can be attached to the main body 1 upside down. . With the above configuration, by mounting the soft member unit 6 with the cylindrical projecting portion 31 of the soft member 3 facing upward, it is possible to reverse the barrel and perform the frictional operation like a conventional thermochromic writing instrument. As a result, it is possible for the user to select a plurality of different usage methods.

In the flexible member mounting structure of the present embodiment, the upper end of the main body 1 is provided with a cylindrical side wall portion 7 that surrounds the rod-shaped portion 2 , and the soft member unit 6 is attached to the main body 1 in a cylindrical shape. Since the projecting portion 31 is housed radially inward of the side wall portion 7, the lateral side of the cylindrical projecting portion 31 is blocked by the side wall portion 7, so that the soft member can be reliably prevented from being soiled.

<Fifth Embodiment>
10 and 11 show a fifth embodiment of the present invention. 5th Embodiment is a modification of the main body 1 in 1st Embodiment. This embodiment relates to a knock-type writing instrument capable of switching between a writing state and a non-writing state by pressing the upper end of a pressing operation portion to cause the pen tip to protrude and retract from the tip. Descriptions of the same configurations and effects as those of the first embodiment will be omitted.

- Main body The main body 1 is made of synthetic resin (for example, polypropylene or polycarbonate) or metal. The main body 1 is the upper end portion of the pressing operation portion of the knock-type writing instrument. A rod-shaped portion 2 projecting upward in the axial direction is integrally formed at the upper end of the main body 1 . The rod-shaped portion 2 can be formed integrally with the main body 1, or can be formed by attaching a separate part.

A side wall portion 7 may be provided at the upper end of the main body 1 as in the fourth embodiment (FIGS. 8 and 9).

Outer cylinder The outer cylinder 8 is made of synthetic resin (eg, polypropylene, polycarbonate) or metal. The outer cylindrical body 8 is the barrel of the writing instrument. The main body 1 is housed inside the outer cylindrical body 8 so as to be axially movable. The inner diameter of the outer cylindrical body 8 is larger than the outer diameter of the soft member unit 6 .

As shown in FIG. 11, in the non-writing state (the pen tip retracted state), the upper end of the outer cylinder 8 is positioned above the body step portion 11 of the main body 1, and the upper end of the outer cylinder 8 and the main body step The difference F in the axial position of the portion 11 is always greater than the longitudinal dimension B of the tubular projection 31 . With this configuration, the sides of the cylindrical projecting portion 31 are closed by the outer cylindrical body 8 , so that the soft member 3 can be prevented from being soiled while the soft member unit 6 is attached to the main body 1 . However, when the side wall portion 7 is provided at the upper end of the main body 1, this is not the case.

· Rod-shaped portion The upper end of the rod-shaped portion 2 always protrudes upward from the upper end of the outer cylindrical body 8 . With the above configuration, even when the soft member unit 6 is removed, the pen tip can be retracted by pressing the rod-shaped portion 2 .

Soft member unit When the soft member unit 6 is attached to the main body 1, pressing the soft member unit 6 allows the pen tip to appear and disappear.

In the mounting structure of the soft member of the present embodiment, the main body 1 is a pressing operation portion of a knock-type writing instrument that can switch between a writing state and a non-writing state by pressing the upper end of the writing instrument so that the pen tip appears and retracts. At the upper end, the main body 1 is housed in an outer cylindrical body 8 which is a shaft cylinder of a knock-type writing instrument so as to be axially movable. By protruding upward, even when the soft member unit 6 is removed from the main body 1, by pressing the rod-shaped part 2, the main body 1 can be moved and the pen tip can appear and disappear.

<Sixth embodiment>
FIG. 12 shows a sixth embodiment of the invention. 6th Embodiment is a modification of the attachment hole 4 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

Mounting hole An enlarged diameter portion 41 is provided at the lower end of the mounting hole 4 . A chamfer is provided between the enlarged diameter portion 41 and the inner surface of the mounting hole 4 . The axial length of the enlarged diameter portion 41 is set larger than the longitudinal dimension B of the tubular projecting portion 31 . The expanded diameter portion 41 functions to improve the insertability of the soft member unit 6 into the main body 1 and to position the soft member unit 6 when it is mounted.

<Seventh Embodiment>
FIG. 13 shows a seventh embodiment of the invention. 7th Embodiment is a modification of the soft member 3 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

Soft Member As shown in FIG. 13, a large-diameter portion 32 is formed on the outer surface of the tubular projecting portion 31 of the soft member 3 . With the above configuration, it is possible to secure a larger area for the soft member 3 to be used during the frictional operation, thereby facilitating the frictional operation.

The soft member 3 is fixed to the cover 5 while the soft member stepped portion 33 formed at the upper end of the large diameter portion 32 and the lower end of the cover 5 are in contact with each other. With the above configuration, the upper end of the soft member 3 does not need to contact the bottom portion 52 of the cover 5, and the longitudinal dimension C of the entire soft member 3 can be kept short. In this embodiment, the outer diameter of the large-diameter portion 32 is 9 mm, and the longitudinal dimension C of the soft member 3 as a whole is 6 mm.

Furthermore, with the above configuration, the contact area between the rod-shaped portion 2 and the soft member 3 can be reduced, and the force required to attach and detach the soft member unit 6 can be reduced while maintaining an appropriate fitting force. can.

・Mounting state As in the fourth embodiment (FIGS. 8 and 9), when the side wall portion 7 is provided at the upper end of the main body 1, the outer diameter of the large diameter portion 32 is smaller than the inner diameter of the side wall portion 7. set.

<Eighth embodiment>
14 and 15 show an eighth embodiment of the present invention. 8th Embodiment is a modification of the soft member 3 and the cover 5 in 1st Embodiment. Descriptions of the same configurations and effects as in the first embodiment will be omitted.

Soft member The soft member 3 is a tubular body having a circular cross section and is fixed to the cover 5 . A mounting hole 4 is provided through the axial center of the soft member 3 in the axial direction. A convex curved surface is formed on the outer peripheral surface of both ends of the soft member 3 .

The soft member 3 includes a tubular protrusion 31 that protrudes from the opening 51 of the cover 5 and an upper tubular protrusion 34 that protrudes from the upper opening 54 of the cover 5 . In the present embodiment, the longitudinal dimension of the tubular projecting portion 31 and the upper tubular projecting portion 34 is 2 mm.

The tubular protrusion 31 and the upper tubular protrusion 34 may have different shapes. With the above configuration, the upper and lower sides of the soft member unit 6 can be selectively used depending on the shapes of the cylindrical projecting portion 31 and the upper cylindrical projecting portion 34 .

- Cover The cover 5 is made of synthetic resin (for example, polypropylene or polycarbonate) or metal. As shown in FIGS. 14 and 15, the cover 5 is a cylindrical body having a circular cross section. The cover 5 is fixed to the outer surface of the soft member 3 without gaps. Both ends of the cover 5 are provided with an opening 51 and an upper opening 54 . The tubular projecting portion 31 and the upper tubular projecting portion 34 of the soft member 3 protrude from the opening portion 51 and the upper opening portion 54, respectively. The cover 5 may be fixed to the outer surface of the soft member 3, and may be provided by fitting, press-fitting, engagement, screwing, adhesion, two-color molding, or the like.

In this embodiment, the soft member unit 6 can be mounted on the main body 1 by turning it upside down. With the above configuration, when the barrel is reversed to perform the frictional operation as in a conventional thermochromic writing instrument, for example, when the cylindrical protrusion 31 becomes unusable due to wear, the soft member unit 6 is turned upside down. By doing so, it can be replaced with an unused upper cylindrical projecting portion 34 .

<Ninth Embodiment>
FIG. 16 shows a ninth embodiment of the present invention. The ninth embodiment is a modification of the soft member 3 in the eighth embodiment. Descriptions of the same configurations and effects as in the eighth embodiment will be omitted.

· Soft member The upper and lower portions of the soft member 3 are formed separately, and a large diameter portion 32 is formed on the outer surface of the cylindrical projecting portion 31 of the soft member 3 . Similarly, an upper large-diameter portion 35 is formed on the outer surface of the upper cylindrical projecting portion 34 . With the above configuration, it is possible to secure a larger area for the soft member 3 to be used during the frictional operation, thereby facilitating the frictional operation.

The soft member 3 on the lower side is fixed to the cover 5 in a state where the soft member stepped portion 33 formed at the upper end of the large diameter portion 32 and the lower end of the cover 5 are in contact with each other. The upper soft member 3 is fixed to the cover 5 while the upper soft member stepped portion 36 formed at the lower end of the upper large diameter portion 35 and the upper end of the cover 5 are in contact with each other. With the above configuration, the longitudinal dimension C of the soft member 3 as a whole can be kept short.

Furthermore, with the above configuration, the contact area between the rod-shaped portion 2 and the soft member 3 can be reduced, and the force required for attachment and detachment can be reduced while maintaining an appropriate fitting force.

Different types of elastic materials may be used above and below the flexible member 3 . With the above configuration, it is possible to selectively use different types of elastic materials depending on the handwriting, even though it is one soft member unit 6 .

・Mounting state As in the fourth embodiment (FIGS. 8 and 9), when the side wall portion 7 is provided at the upper end of the main body 1, the outer diameters of the large diameter portion 32 and the upper large diameter portion 35 are the same as those of the side wall portion 7 set smaller than the inner diameter of

<Tenth Embodiment>
1 to 5 show a first embodiment of the present invention. The tenth embodiment is a modification of the rod-shaped portion 2 and the soft member 3 in the fourth embodiment. Descriptions of the same configurations and effects as in the fourth embodiment will be omitted.

Rod-shaped portion As shown in FIG. 17, an outer engaging portion 23 is provided on the outer surface of the rod-shaped portion 2 . The outer engaging portion 23 is an annular groove. The outer engagement portion 23 may be a groove formed between axially aligned annular projections.

· Mounting hole The inner diameter of the mounting hole 4 is set slightly larger than the outer diameter of the rod-shaped portion 2 . As shown in FIG. 17, an inner engaging portion 42 is provided on the inner surface of the mounting hole 4 . The inner engaging portion 42 is an annular protrusion. The inner diameter of the inner engaging portion 42 is set slightly smaller than the outer diameter of the outer engaging portion 23 . A longitudinal dimension G2 from the lower end of the cover 5 to the inner engaging portion 42 and a longitudinal dimension G3 from the upper end of the side wall portion 7 to the outer engaging portion 23 are set equal. That is, G2=G3.

The outer engaging portion 23 may be an annular protrusion, and the inner engaging portion 42 may be an annular groove. Further, the annular protrusions may be point-like protrusions that are circumferentially and discretely arranged at the same axial position.

- Mounting state The main body 1 and the soft member unit 6 are detachably mounted. As shown in FIG. 18, when the soft member unit 6 is attached to the main body 1, the outer engaging portion 23 and the inner engaging portion 42 are engaged with each other so that the rod-shaped portion 2 and the mounting hole 4 are detachably fitted. match. Since the upper end of the side wall portion 7 and the lower end of the cover 5 are in contact with each other, the positional relationship between the outer engaging portion 23 and the inner engaging portion 42 does not change even if the tubular projecting portion 31 wears.

As in the first embodiment, if the inner diameter of the vent hole 53 is larger than the outer diameter of the base of the rod-shaped portion 2, the flexible member unit 6 can be attached to the main body 1 upside down. . Furthermore, by setting the longitudinal dimension G1 from the upper end of the cover 5 to the inner engaging portion 42 equal to the longitudinal dimension G2 from the lower end of the cover 5 to the inner engaging portion 42 (that is, G1=G2=G3), As shown in FIG. 19, even when the flexible member unit 6 is turned upside down and attached to the main body 1, the outer engaging portion 23 and the inner engaging portion 42 are engaged. By mounting the soft member unit 6 with the cylindrical projecting part 31 facing upward, it is possible to reverse the barrel and perform the frictional operation like a conventional thermochromic writing instrument, which allows multiple uses for different users. It is possible to choose a method.

In the mounting structure of the soft member of this embodiment, the outer engaging portion 23 is provided on the outer surface of the rod-shaped portion 2, and the inner engaging portion 42 is provided on the inner surface of the mounting hole 4, and the soft member unit 6 is attached to the main body 1. When the outer engaging portion 23 and the inner engaging portion 42 are engaged with each other, the soft member unit 6 becomes difficult to come off from the main body 1 .

The mounting structure of the soft member of the present embodiment is that in the sixth invention, the cover 5 is provided with a ventilation hole 53 that communicates with the mounting hole 4, and the soft member unit 6 is mounted vertically with respect to the main body 1. The soft member unit 6 can be attached from either side, and regardless of whether the soft member unit 6 is attached to the main body 1 from the upper or lower side, the outer engaging portion 23 and the inner engaging portion 42 are engaged with each other so that the soft member unit The soft member unit 6 is difficult to come off from the main body 1 regardless of whether the soft member unit 6 is attached to the main body 1 from the upper or lower side.

1 Main body 11 Main body stepped portion 2 Rod-shaped portion 21 Small diameter portion 22 Vertical rib portion 23 Outer engagement portion 3 Soft member 31 Cylindrical projecting portion 32 Large diameter portion 33 Soft member stepped portion 34 Upper cylindrical projecting portion 35 Upper large diameter portion 36 Upper soft member stepped portion 4 Mounting hole 41 Expanded diameter portion 42 Inner engaging portion 5 Cover 51 Opening 52 Bottom 53 Ventilation hole 54 Upper opening 6 Soft member unit 7 Side wall 8 Outer cylindrical body A Longitudinal dimension B of rod-shaped portion 2 Longitudinal dimension C of the tubular projecting portion 31 Longitudinal dimension D of the entire soft member 3 Longitudinal dimension E of the inner hole of the cover 5 Axial height of the side wall portion 7 F Longitudinal dimension G2 from the upper end of the cover 5 to the inner engaging portion 42 Longitudinal dimension G3 from the lower end of the cover 5 to the inner engaging portion 42 Longitudinal dimension from the upper end of the side wall portion 7 to the outer engaging portion 23

Claims (8)

A soft member mounting structure for detachably attaching a soft member unit including a soft member and a cover to the upper end of a main body such as a barrel or a cap of a writing instrument, wherein the upper end of the main body is provided with a rod-shaped portion protruding upward. , the lower end of the soft member has a downwardly opening mounting hole, a cylindrical cover is fixed to the outer surface of the soft member, the soft member has a cylindrical protruding portion protruding from the lower end of the cover, A mounting structure for a soft member, wherein the outer surface of the rod-shaped portion and the inner surface of the mounting hole are detachably fitted. The cover is positioned radially outward of a fitting portion between the outer surface of the rod-shaped portion and the inner surface of the mounting hole in a state in which the soft member unit is attached to the main body. Item 2. A mounting structure for a soft member according to item 1. 3. The mounting structure of the soft member according to claim 2, wherein the soft member and the cover are fixed more firmly than the fitting between the rod-shaped portion and the mounting hole. 4. The flexible unit according to claim 3, wherein the cover is provided with a ventilation hole that communicates with the mounting hole, and the flexible member unit can be attached to the main body from either the upper or lower side. Mounting structure of members. The upper end of the main body is provided with a cylindrical side wall portion that surrounds the rod-shaped portion, and in a state in which the soft member unit is attached to the main body, the cylindrical protruding portion extends radially inward of the side wall portion. 4. The mounting structure for a soft member according to claim 3, wherein the flexible member is housed. An outer engaging portion is provided on the outer surface of the rod-shaped portion, and an inner engaging portion is provided on the inner surface of the mounting hole. 6. The attachment structure of the soft member according to claim 5, wherein the portion is engaged with the portion. The cover is provided with a ventilation hole that communicates with the mounting hole, and the soft member unit can be attached to the main body from either the upper or lower side. 7. The attachment structure for a soft member according to claim 6, wherein said outer engaging portion and said inner engaging portion are engaged with each other regardless of which side is attached. The main body is an upper end portion of a pressing operation portion of a knock-type writing instrument capable of switching between a writing state and a non-writing state by pressing the upper end of the writing instrument to make the pen tip appear and retract, wherein the main body is the knock-type writing instrument. 1. The rod-shaped portion is housed in an outer cylindrical body, which is a shaft cylinder, so as to be axially movable, and the upper end of the rod-shaped portion always protrudes upward from the upper end of the outer cylindrical body. 8. A mounting structure for a soft member according to any one of items 1 to 7.

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