Writing instrument

Abstract

A press writing instrument (1) is provided with: a rear penholder (20); an inner cylinder (30) having, on a side surface thereof, an elastically deformable section (37) that is elastically deformable outward and inward in the radial direction; and a rotating body (40) having a first protruding portion (38) on the outer surface of the elastic deformation portion and a second protruding portion (39) on the inner surface of the elastic deformation portion, the first protruding portion (38) being configured so that the elastic deformation portion deforms radially inward when the inner cylinder is inserted into the rear barrel, and the second protruding portion (39) being configured so that the elastic deformation portion deforms radially inward when the inner cylinder is inserted into the rear barrel before the inner cylinder is inserted into the rear barrel. When the rotating body is inserted into the inner cylinder, the elastic deformation portion deforms radially outward, and the deformed elastic deformation portion restores after the rotating body is inserted.

Description

Technical Field

[0001] The invention relates to a writing tool. Background Art

[0002] There is known a writing tool which is configured so that the rotating body does not separate from the pen barrel or the inner tube when the writing tool is disassembled for replacement of a pen core, etc. (Patent Document 1). That is, in the writing tool described in Patent Document 1, an elastic deformation portion is formed at a position on the front side of the rotating body in the assembled state of the inner tube, and the elastic deformation portion protrudes inward to a position on the inside of the outer diameter of the rotating body when the inner tube is arranged in the pen barrel.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-30669 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In addition, in recent years, from the perspective of material reuse or effective utilization, easy assembly and disassembly of component designs are required. Most writing tools include an engagement relationship between two cylindrical members, such as the relationship between the inner tube and the rotating body described in Patent Document 1, and the ease of assembly and disassembly is very important.

[0008] Specifically, when assembling the writing tool described in Patent Document 1, the rotating body is inserted into the inner cylinder while the elastic deformation part of the inner cylinder installed on the rear pen barrel is deformed and protruded inwardly. In order to arrange the rotating body at a predetermined position, the rotating body needs to overcome the friction resistance between the elastic deformation part protruding inwardly and pass over the elastic deformation part. If the amount of the elastic deformation part protruding inwardly is reduced in order to reduce the friction resistance generated by the elastic deformation part, the rotating body may accidentally fall off from the inner cylinder when the pen core is replaced. In addition, if the rotating body is inserted into the inner cylinder before the inner cylinder is installed relative to the rear pen barrel, the elastic deformation part does not deform inwardly, so when the rotating body is installed on the inner cylinder and the rear pen barrel, the rotating body may fall off from the inner cylinder due to gravity. In addition, since the inner cylinder is installed on the rear pen barrel by fitting, in the case of a user with particularly strong writing pressure, the inner cylinder may also be separated from the rear pen barrel by transmitting force to the inner cylinder via the pen core and the rotating body.

[0009] An object of the present invention is to provide a writing instrument that is easy to assemble and disassemble.

[0010] Solutions for solving problems

[0011] According to one aspect of the present invention, a writing tool is provided, characterized in that the writing tool comprises: a cylindrical first tubular member; a cylindrical second tubular member, which is inserted into the interior from the end of one side of the first tubular member, and the second tubular member has an elastic deformation portion on the side that can elastically deform radially outward and inward; and a cylindrical or columnar internal member, which is inserted into the interior from the end of one side of the second tubular member, has a first engaging portion on the outer surface of the elastic deformation portion or the inner surface of the first tubular member, and has a second engaging portion on the inner surface of the elastic deformation portion, the first engaging portion is configured so that when the second tubular member is inserted into the interior of the first tubular member, the elastic deformation portion is deformed radially inward, and the second engaging portion is configured so that when the internal member is inserted into the interior of the second tubular member in a state before the second tubular member is inserted into the interior of the first tubular member, the elastic deformation portion is deformed radially outward, and the deformed elastic deformation portion is restored after the insertion of the internal member.

[0012] The first cylindrical member may be a pen holder, the second cylindrical member may be an inner cylinder inserted from the rear end of the pen holder, and the internal member may be a rotating body or an operating member inserted from the front end of the inner cylinder. The writing tool may also include a front pen holder, the first cylindrical member may be a rear pen holder, the second cylindrical member may be an inner cylinder inserted from the rear end of the rear pen holder, the front pen holder is threadedly connected to the inner cylinder, and the internal member may be a rotating body or an operating member inserted from the front end of the inner cylinder. The elastic deformation portion may be in the shape of a cantilever beam extending toward the rear. The first engaging portion or the second engaging portion may be a protrusion.

[0013] Effects of the Invention

[0014] According to the aspect of the present invention, there is a common effect of providing a writing instrument that is easy to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a side view of the first push-type writing tool in a non-writing state

[0016] Figure 2 yes Figure 1 A longitudinal sectional view of a push-type writing instrument.

[0017] Figure 3 yes Figure 1 A longitudinal sectional view of a push-type writing tool in writing state.

[0018] Figure 4 The refill is from Figure 1 A longitudinal sectional view of the push-type writing tool in a state where the writing state has been further advanced.

[0019] Figure 5 yes Figure 1 A partial cross-sectional view of the front pen barrel of a push-type writing instrument.

[0020] Figure 6 yes Figure 1 A longitudinal cross-sectional view of the rear pen holder of a push-type writing instrument.

[0021] Figure 7 yes Figure 6 Front view of the rear pen holder.

[0022] Figure 8 yes Figure 1 A three-dimensional view of the inner cylinder of a snap-action writing instrument.

[0023] Fig. 9 yes Figure 8 A longitudinal sectional view of the inner cylinder.

[0024] Fig.10 yes Figure 1 A three-dimensional diagram of a rotating body of a snap-action writing instrument.

[0025] Fig.11 yes Fig.10 An exploded perspective view of a rotating body.

[0026] Fig.12 yes Figure 1 A three-dimensional view of the brake component of a snap-action writing instrument.

[0027] Fig.13 yes Fig.12 A longitudinal sectional view of a brake component.

[0028] Fig.14 yes Figure 3 An enlarged view of the vicinity of the elastic deformation portion of a push-type writing instrument.

[0029] Fig.15 yes Figure 3 An enlarged view of the front end of a snap-action writing instrument.

[0030] Fig.16 yes Figure 4 An enlarged view of the front end of a snap-action writing instrument.

[0031] Fig.17 It is a perspective view of other brake components.

[0032] Fig.18 It is a perspective view of still another brake component.

[0033] Fig.19 It is a longitudinal sectional view of the second push-type writing tool in the non-writing state.

[0034] Fig. 20 yes Fig.19 A longitudinal cross-sectional view of the rear pen holder of a push-type writing instrument.

[0035] Fig.21 yes Fig.19 A three-dimensional view of the inner cylinder of a snap-action writing instrument.

[0036] Fig. 22 yes Fig.21 A longitudinal sectional view of the inner cylinder.

[0037] Fig.23 It is a longitudinal sectional view of the third push-type writing tool in a non-writing state.

[0038] Fig.24 yes Fig.23 A three-dimensional view of the inner cylinder of a snap-action writing instrument.

[0039] Fig.25 yes Fig.24 A longitudinal sectional view of the inner cylinder. DETAILED DESCRIPTION

[0040] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In all the drawings, corresponding components are denoted by common reference numerals.

[0041] Figure 1 is a side view of the first push-type writing tool 1 in a non-writing state, Figure 2 yes Figure 1 A longitudinal sectional view of a push-type writing instrument 1, Figure 3 yes Figure 1 A longitudinal sectional view of the push-type writing tool 1 in the writing state. In addition, Figure 4 Is the refill 4 from Figure 1 1 is a longitudinal sectional view showing a state in which the writing state of the push-type writing instrument 1 is further advanced, and is a view for explaining a brake member 60 to be described later.

[0042] The push-type writing tool 1 has: a pen body 2, which has a front pen body 10, a rear pen body 20 arranged behind the front pen body 10, and an inner tube 30 engaged with the rear end of the rear pen body 20; a pen head member 3 engaged with the front end of the pen body 2; and a refill 4 as a writing body, which is arranged in the pen body 2 and has a writing part 4a at one end. In the following embodiment, the refill 4 is a refill of a ballpoint pen. In this specification, in the axial direction of the push-type writing tool 1, the writing part 4a side is defined as the "front" side, and the side opposite to the writing part 4a is defined as the "rear" side.

[0043] A pen clip member 5 made of a metal wire is mounted on the side of the pen barrel 2. The pen barrel 2 is provided with: a spring 6 as an elastic member that applies force to the pen core 4 in the rear direction; a rotating body 40 that is arranged behind the pen core 4; and an operating member 50 that is arranged behind the rotating body 40. The push-type writing tool 1 has a well-known push mechanism. By performing a push operation to overcome the force of the spring 6 and to press the operating member 50 forward, the writing portion 4a of the pen core 4 protrudes from the front end of the pen barrel 2 (the writing state) Figure 3 ) and the non-writing state where the writing portion 4a is immersed in the pen holder 2 ( Figure 1 and Figure 2 )

[0044] The refill 4 has: the writing part 4a mentioned above; a tubular refill body 4b capable of storing ink; and a joint member 4c connecting the writing part 4a and the tubular refill body 4b. A brake member 60 as a tubular member is integrally arranged on the outer surface of the front end of the refill 4 as a brake part.

[0045] Figure 5 yes Figure 1 A partial cross-sectional view of the front pen barrel 10 of the push-type writing tool 1. The front pen barrel 10 is a cylindrical member. An external threaded portion 11 is formed on the outer surface of the rear end portion of the front pen barrel 10, and the external threaded portion 11 is threadedly connected to the internal threaded portion 21 formed on the inner surface of the front end portion of the rear pen barrel 20. A cylindrical surface 12 having the same inner diameter in the entire axial direction is formed on the inner surface of the front end portion of the front pen barrel 10. A plurality of protrusions 13 arranged at equal intervals along the circumferential direction are formed at the rear end portion of the cylindrical surface 12. The pen head member 3 is fitted with the cylindrical surface 12 and the plurality of protrusions 13 and is installed on the pen barrel 2, that is, the front pen barrel 10. A tapered surface 14 is formed on the inner surface of the front pen barrel 10 that is farther back than the cylindrical surface 12. The tapered surface 14 has a larger diameter than the cylindrical surface 12, but the inner diameter gradually decreases toward the front. An annular protrusion 15 is formed behind the tapered surface 14.

[0046] Figure 6 yes Figure 1 A longitudinal sectional view of the rear pen holder 20 of the push-type writing instrument 1, Figure 7 yes Figure 6The front view of the rear pen barrel 20. The rear pen barrel 20 is a cylindrical member. An internal thread portion 21 is formed on the inner surface of the front end portion of the rear pen barrel 20, and the internal thread portion 21 is threadedly connected to the external thread portion 11 of the front pen barrel 10. Two rectangular reduced diameter portions 22 protruding radially inward are formed behind the internal thread portion 21. The reduced diameter portion 22 is a protrusion protruding from the inner surface of the rear pen barrel 20 at a uniform height. The two reduced diameter portions 22 are arranged at positions opposite to each other across the central axis of the rear pen barrel 20. An inclined surface 23 is provided at the rear end portion of the reduced diameter portion 22. A rectangular notch portion 24 extending from the rear end opening toward the front is formed at the rear end portion of the rear pen barrel 20. A first pen clip holding portion 25 is formed in front of the notch portion 24. The first pen clip holding portion 25 and the two reduced diameter portions 22 are respectively arranged at positions offset by 90 degrees in the rotation direction around the central axis.

[0047] Figure 8 yes Figure 1 A three-dimensional view of the inner cylinder 30 of the push-type writing instrument 1, Fig. 9 yes Figure 8 30 is a longitudinal sectional view of the inner tube 30. The inner tube 30 is a cylindrical member. A flange portion 31 is formed on the outer surface of the rear end portion of the inner tube 30. A fitting surface 32 is formed in front of the flange portion 31. The fitting surface 32 is formed to have a slightly larger diameter than the outer surface in front. A second clip holding portion 33 connected to a part of the flange portion 31 is formed on the outer surface of the fitting surface 32. An outer cam 34 including a plurality of protrusions extending in the front-rear direction is formed on the inner surface of the rear end portion of the inner tube 30.

[0048] Two rectangular recesses 35 are formed on the outer surface in front of the inner tube 30. The recesses 35 are recesses with a uniform depth from the outer surface of the inner tube 30. The two recesses 35 are arranged at positions opposite to each other across the central axis of the inner tube 30. The second clip holding portion 33 and the two recesses 35 are respectively arranged at positions offset by 90 degrees in the rotation direction around the central axis. A U-shaped hole 36 is formed in the rectangular recess 35, and the U-shaped hole 36 includes a through hole along the rear edge and two through holes extending forward from the two ends of the through hole. The U-shaped hole 36 is used to divide and form an elastic deformation portion 37 inside the recess 35.

[0049] The elastic deformation portion 37 is in the shape of a cantilever beam extending rearward in the recess 35. A first protrusion 38 protruding radially outward is formed on the outer surface of the elastic deformation portion 37. A second protrusion 39 protruding radially inward is formed on the inner surface of the elastic deformation portion 37. The first protrusion 38 and the second protrusion 39 are spherical protrusions. The circumscribed circle of the two first protrusions 38 is slightly larger than the diameter of the inscribed circle of the two reduced diameter portions 22 of the rear pen body 20. In addition, the circumscribed circle of the two first protrusions 38 is slightly smaller than the outer diameter of the inner tube 30. The inscribed circle of the two second protrusions 39 is slightly smaller than the outer diameter of the front end portion of the rotating body 40, specifically, slightly smaller than the outer diameter of the cam member 41 of the rotating body 40.

[0050] Fig.10 yes Figure 1 A three-dimensional view of a rotating body 40 of a push-type writing instrument 1, Fig.11 yes Fig.10 1 is an exploded perspective view of the rotating body 40. The rotating body 40 is a cylindrical member formed by combining a cam member 41 and a receiving member 42 which are two separate cylindrical members.

[0051] The cam member 41 is made by injection molding of a resin material such as polypropylene or polyacetal, which is the same as the front pen barrel 10 and the rear pen barrel 20. An inner cam 43 is provided at equal intervals along the circumferential direction on the outer surface of the cam member 41. The inner cam 43 includes a plurality of protrusions extending in the front-rear direction. The inner cam 43 can be arranged between the outer cams 34 formed on the inner cylinder 30 and cooperate with the outer cams 34. A cam receiving surface 44 is formed on the rear end surface of the cam member 41. The cam receiving surface 44 is configured to contact the cam surface 51 ( Figure 2 The outer diameter of the cam member 41 is formed to be slightly smaller than the inner diameter of the inner cylinder 30.

[0052] The receiving member 42 is manufactured by performing sheet metal processing such as bending a metal plate. Specifically, a rectangular metal plate is prepared, and the edge located on the rear side when configured in the push-type writing instrument 1 is bent 90 degrees in one direction to form a rear end edge 45. In addition, the edge located on the front side is bent 90 degrees in the other direction to form a front end edge 46. Next, the metal plate is bent into a cylindrical shape to obtain a cylindrical receiving member 42. In the receiving member 42, the rear end edge 45 protrudes radially inward in a roughly annular shape, and the front end edge 46 protrudes radially outward in a roughly annular shape. The outer diameter of the front end edge 46 is formed to be smaller than the outer diameter of the cam member 41. The axial length of the receiving member 42 is longer than the axial length of the cam member 41. Therefore, in the assembled state, the receiving member 42 protrudes rearward from the rear end of the cam member 41. The two end surfaces in the circumferential direction after being bent into a cylindrical shape can be as shown. Fig.11 As shown, they are separated, but they can also abut against each other.

[0053] The rear end edge 45 is formed with three semicircular locking portions 47 that further protrude radially inward. The three locking portions 47 are arranged at equal intervals along the circumferential direction. The front end edge 46 is formed with three cutout portions 48 that extend toward the rear. The three cutout portions 48 are arranged at equal intervals along the circumferential direction. By forming the cutout portions 48, when the metal sheet is bent into a cylindrical shape when the storage member 42 is manufactured, the front end edge 46 can be bent smoothly. A convex retaining protrusion 49 is formed on the outer surface of the storage member 42.

[0054] The rotating body 40 is assembled by inserting the receiving member 42 from the front end opening of the cam member 41. That is, the receiving member 42 inserted into the cam member 41 is inserted until the front end edge portion 46 abuts against the front end surface of the cam member 41. The rear end surface of the bent front end edge portion 46 abuts against the front end surface of the cam member 41, thereby preventing the receiving member 42 from moving backward, that is, coming out. The inner diameter of the cam member 41 is formed to be the same as or slightly larger than the outer diameter of the receiving member 42. The cam member 41 and the receiving member 42 are fixed by the retaining protrusion 49 of the receiving member 42 being locked with the inner surface of the cam member 41. The receiving member 42 is configured to be accommodated inside the operating member 50. The outer diameter of the receiving member 42 is formed to be slightly smaller than the inner diameter of the operating member 50. As a result, the operating member 50 can move in the axial direction relative to the receiving member 42 and then relative to the rotating body 40.

[0055] In the rotating body 40, the cam member 41 has the function of the rotating body used in the conventional push mechanism. That is, in the push-type writing tool 1 in the non-writing state, when the push operation of overcoming the force of the spring 6 and pressing the operating member 50 forward is performed, the rotating body 40 and then the refill 4 and the operating member 50 move forward together. When the inner cam 43 of the rotating body 40 disposed between the outer cams 34 of the inner cylinder 30 passes over the outer cam 34 in the axial direction, the cam surface 51 of the operating member 50 cooperates with the cam receiving surface 44 of the rotating body 40 to rotate the rotating body 40 around the central axis. Then, when the pressure on the operating member 50 is released, the rotating body 40 retreats under the force of the spring 6, the rear end surface of the inner cam 43 is locked with the front end surface of the outer cam 34, and the push-type writing tool 1 enters the writing state. When the pressing operation is performed again in this state, the rotating body 40 and the operating member 50 move forward together, and the locking of the inner cam 43 and the outer cam 34 is released. As a result, the cam surface 51 of the operating member 50 cooperates with the cam receiving surface 44 of the rotating body 40 to rotate the rotating body 40 around the central axis. Then, when the pressing of the operating member 50 is released, due to the force of the spring 6, the rotating body 40 and the pen core 4 retreat together, and the inner cam 43 is arranged between the outer cam 34 again, and the pressing writing tool 1 becomes a non-writing state.

[0056] The receiving member 42 is configured to receive the pen core 4 inside over the entire length of the receiving member 42. Thus, the push-type writing tool 1 can be made shorter and thinner. That is, usually, the push-type writing tool is moved back and forth integrally with the rotating body through the pen core, and the push-type writing tool is in a writing state or a non-writing state. Therefore, the total length of the push-type writing tool cannot be made shorter than the overall length of the pen core and the rotating body in an integrated state. Therefore, in the push-type writing tool 1, the pen core 4 is received over the entire length of the receiving member 42 and then the rotating body 40, thereby making the total length shorter than other push-type writing tools having a pen core 4 of the same length.

[0057] Moreover, the receiving member 42 is made of a metal plate. Therefore, compared with the case where the same cylindrical member is made of resin, the wall thickness can be reduced, that is, the length in the radial direction can be shortened to the plate thickness. In detail, usually, the rotating body is integrally formed with a cam portion that is equivalent to the cam member 41 in the above-mentioned rotating body 40 and cooperates with the operating member, and a receiving portion that is equivalent to the receiving member 42 and is received in the operating member. The cam portion is formed to be larger in diameter than the receiving portion. In order to make the push-type writing tool thinner, as in the third push-type writing tool 200 described later, when the rear end face of the pen core is abutted against the front end face of the rotating body instead of receiving the rear end of the pen core inside the rotating body, the total length of the push-type writing tool becomes longer accordingly. In addition, in order to make the total length of the push-type writing tool shorter, when the rear end of the pen core is received inside the rotating body over the entire length of the rotating body, the outer diameter of the portion of the receiving portion becomes larger. In this way, in order to provide a cam receiving surface that cooperates with the operating member, the outer diameter of the cam portion needs to be increased, resulting in the thicker push-type writing instrument. When the rear end of the pen core is accommodated only in the part of the cam portion of the rotating body, instead of being able to make the push-type writing instrument thinner, the push-type writing instrument becomes longer by an amount corresponding to the length of the accommodation portion.

[0058] In the push-type writing instrument 1 , the rotating body 40 is composed of two components, namely the cam member 41 and the receiving member 42 . By making the receiving member 42 a metal plate, the push-type writing instrument 1 can be made shorter and thinner while reducing manufacturing costs.

[0059] The front edge portion 46 may be configured arbitrarily as long as it can be locked with the cam member 41 to prevent the accommodating member 42 from falling out. For example, the ratio of the front edge portion 46 formed in the circumferential direction may be set to less than half, in which case the cutout portion 48 may not be formed. In addition, instead of the front edge portion 46, one or more locking portions in a semicircular or rectangular shape protruding radially outward may be formed, such as the locking portion 47 provided on the rear edge portion 45.

[0060] The rear end edge 45 bent radially inwardly prevents the lead 4 inserted into the receiving member 42 from moving backward, that is, from falling out. In addition, when the length of the rear end edge 45 in the radial direction, in other words, the length of the bent portion is short, it is easy to bend into a cylindrical shape. On the other hand, if it is too short, for example, when a thinner lead is inserted into the receiving member 42, there is a possibility that it will fall out backward. In the receiving member 42, by providing a locking portion 47, a thinner lead 4 that is not locked with the rear end edge 45 can be locked to prevent it from falling out, and the processability can be improved. For the receiving member 42, as long as it can prevent the lead 4 from falling out backward, it can be provided with at least one locking portion 47 protruding radially inwardly instead of the rear end edge 45. It is preferred that more than two locking portions 47 are provided, and the two or more locking portions 47 are preferably arranged at equal intervals along the circumferential direction. The locking portion 47 may not be semicircular, but may be rectangular.

[0061] Fig.12 yes Figure 1 A three-dimensional view of the brake member 60 of the push-type writing instrument 1, Fig.13 yes Fig.12 The longitudinal cross-sectional view of the brake member 60. The brake member 60 is a cylindrical member. Fig.12 and Fig.13 In the embodiment, the brake member 60 is attached to the writing core 4 in such a manner that the lower side becomes the front side of the push-type writing implement 1 and the upper side becomes the rear side of the push-type writing implement 1 .

[0062] Four protrusions 61 are formed on the outer surface of the rear end of the brake member 60 and are arranged at equal intervals along the circumferential direction. A tapered portion 62 is formed on the outer surface of the front half of the brake member 60, and the inner diameter of the tapered portion 62 gradually decreases slightly as it goes forward. Four brake protrusions 63 are formed near the peripheral edge of the front end surface of the brake member 60, and the four brake protrusions 63 protrude forward and are arranged at equal intervals along the circumferential direction. In the cross section orthogonal to the axial direction of the brake member 60, that is, the cross section, the cross section of each brake protrusion 63 is in the shape of an arc centered on the central axis of the brake member 60. The diameter of the circumscribed circle at the rear end of the four brake protrusions 63 is slightly smaller than the outer diameter of the front end of the tapered portion 62.

[0063] On the outer surfaces of the braking protrusions 63, that is, the surfaces facing radially outward, there are formed braking conical surfaces 64 whose diameters of the circumscribed circles of the four braking protrusions 63 gradually decrease toward the front. The braking conical surfaces 64 are formed complementarily to the part of the conical surface 14 provided on the side of the pen barrel 2. On the other hand, on the inner surfaces of the braking protrusions 63, that is, the surfaces facing radially inward, the diameters of the inscribed circles of the four braking protrusions 63 are formed to be the same. Therefore, each of the braking protrusions 63 is formed in a manner that gradually becomes thinner toward the front. Since the braking protrusions 63 are cantilever beam-shaped, they have radially inward and radially outward flexibility with respect to radial forces. In particular, since the braking protrusions 63 gradually become thinner toward the front, the front portion of the braking protrusions 63 is more flexible than the rear portion.

[0064] A through hole 65 is formed on the front end surface of the brake member 60 for the pen core 4 to pass through. A cylindrical protrusion 66 is formed around the through hole 65 on the front end surface of the brake member 60 to protrude forward. The protrusion amount of the cylindrical protrusion 66 is less than the protrusion amount of the brake protrusion 63 relative to the front end surface of the brake member 60, and is about half. An annular spring support surface 67 is formed around the through hole 65, which is divided by the through hole 65 and the cylindrical protrusion 66. Three spring retaining protrusions 68 are formed on the inner surface of the cylindrical protrusion 66 and are arranged at equal intervals along the circumferential direction. An annular abutment surface 69 is formed on the inner surface of the front end portion of the brake member 60.

[0065] Regarding the assembly of the push-type writing tool 1, the following mainly refers to Figure 2 as well as Fig.14 Provide explanation. Fig.14 yes Figure 3 An enlarged view of the vicinity of the elastic deformation portion 37 of the push-type writing tool 1.

[0066] First, for example, the integrated rotating body 40 and the operating member 50 in a state where the receiving member 42 is received in the operating member 50 are inserted into the inner part while being pressed from the front end opening of the inner cylinder 30 in a state where the front end opening is directed vertically upward. At this time, as described above, the inscribed circle of the two second protrusions 39 of the inner cylinder 30 is slightly smaller than the outer diameter of the cam member 41 of the rotating body 40. On the other hand, since the elastic deformation part 37 provided with the second protrusion 39 is in the shape of a cantilever beam extending backward, it can be elastically deformed radially inward and radially outward. Therefore, the rotating body 40 and the operating member 50 are inserted deep into the inner cylinder 30 while pressing the second protrusion 39 and deforming the elastic deformation part 37 radially outward. The deformed elastic deformation part 37 returns to its original state at the moment when the rotating body 40 and the operating member 50 pass through the second protrusion 39. In addition, the operating member 50 may be inserted into the inner part of the inner cylinder 30 at first, and then the rotating body 40 may be inserted into the inner part of the inner cylinder 30 while being pressed.

[0067] In this state, if the front end opening of the inner cylinder 30 is directed vertically downward, the rotating body 40 and the operating member 50 move downward due to gravity. The movement of the rotating body 40 and the operating member 50 is stopped by the locking of the rotating body 40 and the second protrusion 39. At this time, the second protrusion 39 is pressed due to the deadweight of the rotating body 40 and the operating member 50, but the elastic deformation portion 37 does not deform radially outward. In other words, the rigidity of the elastic deformation portion 37 is set in such a way that the elastic deformation portion 37 does not deform due to the radially outward force caused by the deadweight of the rotating body 40 and the operating member 50. The rigidity of the elastic deformation portion 37 is appropriately set by adjusting the wall thickness, shape or size of the elastic deformation portion 37.

[0068] Therefore, even if the front end opening of the inner cylinder 30 is directed vertically downward, the rotating body 40 and the operating member 50 will not fall off from the inner cylinder 30. In short, since the inner cylinder 30 has the elastic deformation portion 37 and the second convex portion 39, for example, in a state where the rotating body 40 and the operating member 50 are assembled with respect to the inner cylinder 30, even if the front end opening of the inner cylinder 30 is mistakenly directed vertically downward before the next assembly process is transferred, the rotating body 40 and the operating member 50 can be prevented from falling off. On the other hand, during the assembly operation, since the rotating body 40 and the operating member 50 are pressed by the assembly device or the operator, the elastic deformation portion 37 can be deformed, and the rotating body 40 and the operating member 50 can be easily inserted into the deep part of the inner cylinder 30.

[0069] Next, the inner tube 30 in a state where the rotating body 40 and the operating member 50 are assembled is inserted while being pressed from the rear end opening of the rear barrel 20. The outer diameter of the front end of the inner tube 30 is slightly larger than the diameter of the inscribed circle of the reduced diameter portion 22 of the rear barrel 20. However, since the inclined surface 23 is formed at the rear end of the reduced diameter portion 22 of the rear barrel 20, the front end edge of the inner tube 30 can pass over the reduced diameter portion 22 and the inner tube 30 can be inserted deep. The insertion of the inner tube 30 relative to the rear barrel 20 is performed in a manner that the first clip holding portion 25 of the rear barrel 20 and the second clip holding portion 33 of the inner tube 30 are aligned in the axial direction. As a result, the second clip holding portion 33 of the inner tube 30 is accommodated in the notch portion 24, and the second clip holding portion 33 is engaged with the first clip holding portion 25. At this time, the front end surface of the flange portion 31 of the inner tube 30 abuts against the rear end surface of the rear barrel 20, and the fitting surface 32 fits with the inner surface of the rear end portion of the rear barrel 20. Thus, the fitting of the inner tube 30 to the rear barrel 20 is completed. In addition, the clip member 5 is attached to the barrel 2 by the first clip holding portion 25 and the second clip holding portion 33.

[0070] Reference Fig.14In the state where the inner tube 30 is mounted on the rear pen barrel 20, the reduced diameter portion 22 of the rear pen barrel 20 is accommodated in the recessed portion 35 of the inner tube 30. Therefore, even if a force is applied to the inner tube 30 to pull it out from the rear pen barrel 20, the front end edge of the reduced diameter portion 22 of the rear pen barrel 20 is locked with the step portion in front of the recessed portion 35 of the inner tube 30, thereby preventing the inner tube 30 from being separated from the rear pen barrel 20. Moreover, the first protrusion 38 of the elastic deformation portion 37 abuts against the reduced diameter portion 22 of the rear pen barrel 20, so that the elastic deformation portion 37 is elastically deformed in a manner of bending radially inward. As a result, the rear end edge 37a of the inner surface of the elastic deformation portion 37 protrudes to a position radially inward from the cylindrical outer surface of the cam member 41 of the rotating body 40.

[0071] In this state, when the front end opening of the rear pen barrel 20 is directed vertically downward, the rotating body 40 and the operating member 50 move downward due to gravity. The front end edge or front end surface of the rotating body 40 is locked with the rear end edge 37a or rear end surface of the elastic deformation portion 37, and the movement of the rotating body 40 and the operating member 50 is stopped. Therefore, when replacing the pen core, even if the front end opening of the rear pen barrel 20 is directed vertically downward, the rotating body 40 will not accidentally fall off from the rear pen barrel 20 and the inner cylinder 30. In addition, compared with the inner cylinder 30 installed in front of the rear pen barrel 20, the elastic deformation portion 37 is further elastically deformed radially inward, so that the rotating body 40 and the operating member 50 can be more reliably prevented from falling off.

[0072] Alternatively, after the inner tube 30 is mounted on the rear barrel 20, the rotating body 40 and the operating member 50 may be inserted into the rear barrel 20 and the inner tube 30. That is, since the elastic deformation portion 37 is in the shape of a cantilever beam extending rearward in the recess 35, even if it is bent radially inward, the rotating body 40 and the operating member 50 can be inserted along the curve with elastic deformation.

[0073] As an assembly operation, the refill 4 is inserted from the rear end opening of the brake member 60. The front end surface of the joint member 4c of the refill 4 is brought into contact with the abutment surface 69 inside the brake member 60, and the outer surface of the refill 4 and the inner surface of the brake member 60 are fitted with each other. Next, the spring 6 is inserted into the front barrel 10 from the rear end opening into which the nib member 3 is fitted. Next, the refill 4 with the brake member 60 mounted thereon is inserted into the front barrel 10 from the rear end opening into the front barrel 10, and the front end portion of the refill 4, i.e., the writing portion 4a, is arranged inside the spring 6. The brake member 60 also serves as a guide when the refill 4 is inserted into the front barrel 10.

[0074] The front end of the spring 6 is arranged on the step inside the pen head member 3, and the rear end of the spring 6 is arranged on the spring support surface 67. Therefore, in the assembled state, the force of the spring 6 is transmitted to the rotating body 40 via the brake member 60 and the pen core 4. The radial movement of the spring 6 is limited by the spring retaining protrusion 68. Next, the assembly of the push-type writing instrument 1 is completed by threading the rear pen barrel 20 on which the inner tube 30 is installed relative to the front pen barrel 10. The brake member 60 can be arranged in a manner that it moves integrally with the pen core 4 in the pen barrel 2. Therefore, in addition to being integrally fitted with each other as described above, the front end face of the joint member 4c of the pen core 4 can also be in contact with the internal abutment surface 69 of the brake member 60 by utilizing the force of the spring 6 when the brake member 60 is loosely inserted relative to the pen core 4.

[0075] According to the push-type writing instrument 1, a writing instrument that is easy to assemble and disassemble can be provided. Specifically, the rotating body 40 and the operating member 50 are inserted into the inner tube 30 alone, but as described above, even if the inner tube 30 is turned upside down after the rotating body 40 and the operating member 50 are inserted, the rotating body 40 and the operating member 50 will not fall off. Therefore, the inner tube 30 can be installed on the rear pen body 20 without paying attention to the posture of the inner tube 30. On the other hand, in the case of mistakenly inserting the rotating body 40 into the inner tube 30, for example, in the case of mistaken color of the component, the operating member 50 is pressed forward from the rear of the inner tube 30. Thus, as in the case of assembly, the rotating body 40 and the operating member 50 press the second protrusion 39 to deform the elastic deformation part 37 radially outward, and the rotating body 40 and the operating member 50 can be taken out from the front end opening of the inner tube 30 through the second protrusion 39. Therefore, the push-type writing instrument 1 can be easily assembled and easily disassembled. In addition, the disassembled parts can be used for easy reassembly.

[0076] In addition, the anti-falling function of the elastic deformation part 37 can be applied not only to the relationship between the rear pen body 20 as the first tubular member, the inner tube 30 as the second tubular member, and the rotating body 40 as the internal member, but also to other two tubular members and internal members. For example, the first tubular member can be the front pen body, the second tubular member can be the rear pen body, and the internal member can be the operating member. In this case, the elastic deformation part is formed on the rear pen body. In addition, in addition to the push-type writing tools, it can also be applied to general writing tools such as cap-type writing tools.

[0077] The elastic deformation part 37 is a cantilever beam extending backward, but it can also be a cantilever beam extending forward, or a cantilever beam extending in the circumferential direction. In addition, the elastic deformation part can be arbitrarily configured as long as it is elastically deformed in the radial direction. The first protrusion 38 as the first locking part and the second protrusion 39 as the second locking part are spherical protrusions, but as long as the elastic deformation part 37 is elastically deformed in cooperation with the rear pen body 20 and the rotating body 40, it can also be a protrusion of other shapes. In short, as long as the first locking part elastically deforms the elastic deformation part radially inward, and the second locking part elastically deforms the elastic deformation part radially outward, it can be arbitrarily configured. Therefore, for example, the first locking part can also be provided on the rear pen body side. Specifically, it is also possible to set the protrusion only on the reduced diameter part 22, or to make the reduced diameter part 22 protrude more radially inward. Similar to the reduced diameter part 22, it is possible to arbitrarily configure as long as the elastic deformation part is elastically deformed radially inward. The reduced diameter portion may be omitted and the first convex portion may be made more protruding, as in the second snap writing instrument 100 described later. The reduced diameter portion 22 and the first convex portion 38 may be provided together as the first locking portion.

[0078] In summary, the writing tool comprises: a cylindrical first tubular member; a cylindrical second tubular member, which is inserted into the interior from the end of one side of the first tubular member and has an elastic deformation portion on the side that can elastically deform radially outward and inward; and a cylindrical or columnar internal member, which is inserted into the interior from the end of one side of the second tubular member, has a first snap-fitting portion on the outer surface of the elastic deformation portion or the inner surface of the first tubular member, and has a second snap-fitting portion on the inner surface of the elastic deformation portion, the first snap-fitting portion being configured so that when the second tubular member is inserted into the interior of the first tubular member, the elastic deformation portion is deformed radially inward, the second snap-fitting portion being configured so that, in a state before the second tubular member is inserted into the interior of the first tubular member, when the internal member is inserted into the interior of the second tubular member, the elastic deformation portion is deformed radially outward, the deformed elastic deformation portion being configured so as to be restored after the internal member is inserted, and the writing tool can be configured arbitrarily as long as it is in this manner.

[0079] Next, refer to Fig.15 and Fig.16 The function of the braking member 60 will be described. Fig.15 yes Figure 3 An enlarged view of the front end of the push-type writing tool 1, Fig.16 yes Figure 4 An enlarged view of the front end of the push-type writing tool 1.

[0080] When the pen core is moving forward in the non-writing state or the writing state, there is a case where an impact is applied to the pen core. The impact when the pen core is moving forward occurs, for example, when the push-type writing tool is accidentally dropped and the push-type writing tool vertically hits the ground from the rear end. At this time, the pen core moves forward violently and exceeds the forward position based on the normal push operation, resulting in collision with the inner surface of the pen barrel, which may cause damage to the pen core.

[0081] exist Fig.15 In the push-type writing implement 1 in the writing state shown, the brake member 60, specifically the brake protrusion 63, is not elastically deformed. The brake protrusion 63, in particular, the brake conical surface 64 is separated from the inner surface of the pen barrel 2, that is, the inner surface of the front pen barrel 10. The brake member 60 is pressed against the joint member 4c of the pen core 4 by the force of the spring 6. In addition, at least one of the four protrusions 61 formed on the outer surface of the rear end of the brake member 60 abuts against the inner surface of the front pen barrel 10, so that the position of the pen core 4 is aligned in such a way that the central axis of the pen core 4 coincides with the central axis of the pen barrel 2.

[0082] When the pen core 4 moves forward violently, Fig.15 The push-type writing tool 1 in the state shown becomes Fig.16 The state shown. That is, as the brake member 60 moves forward, the brake conical surface 64 of the brake protrusion 63 slides in contact with the conical surface 14 of the front pen body 10, and the brake protrusion 63 is elastically deformed by the radially inward force from the conical surface 14. The friction resistance generated by the sliding contact between the brake conical surface 64 and the conical surface 14 and the elastic deformation of the brake protrusion 63 reduce the kinetic energy of the pen core 4 and the brake member 60, and finally the impact on the pen core 4 is alleviated. In short, the brake protrusion 63 and the conical surface 14 of the brake member 60 cooperate with each other to prevent the damage of the pen core 4.

[0083] As described above, in the push-type writing tool 1, the impact applied when the pen core 4 moves forward can be mitigated by a simple mechanism. In addition, when the brake member 60 that elastically deforms to mitigate the impact is locked to the inner surface of the front pen barrel 10, the writing portion 4a can be pressed against the writing surface to restore the original writing state. In addition, the spring constant of the spring 6 can also be set so that the brake member 60 automatically returns to the original writing state.

[0084] Generally speaking, a tapered surface is formed on the inner surface of the front end of the pen barrel, so the brake member 60 can be configured to be mounted on the refill of an existing push-type writing tool. The refill 4 and the brake member 60 can also be formed integrally to form a brake portion.

[0085] In addition, if the push-type writing tool is pushed in the writing state, the pen core will move violently backward due to the urging force of the spring. That is, when switching from the writing state to the non-writing state, the pen core may be impacted.

[0086] In the push-type writing instrument 1, when the pen core 4 moves backward, the protrusion 61 of the brake member 60 contacts the pen barrel 2, specifically the annular protrusion 15 of the front pen barrel 10, and the protrusion 61 of the brake member 60 moves backward while sliding over the annular protrusion 15 of the pen barrel 2. The kinetic energy of the pen core 4 and the brake member 60 is reduced by the friction resistance generated by the sliding of the protrusion 61 of the brake member 60 relative to the annular protrusion 15 of the pen barrel 2, and finally, the impact applied to the pen core 4 when the pen core 4 moves backward is alleviated. The spring characteristics and configuration of the spring 6 are selected in such a way that the pen core 4 can be applied with force to overcome the above-mentioned friction force and switch the push-type writing instrument 1 from the writing state to the non-writing state.

[0087] As described above, in the push-type writing tool 1, the impact applied to the pen core 4 in both the case of the pen core 4 moving forward and the pen core 4 moving backward can be mitigated. In addition, the projection 61 of the braking member 60 can be omitted, and only the impact applied to the pen core 4 when the pen core 4 moves backward can be mitigated.

[0088] Fig.17 It is a perspective view of another braking member 160 . Figure 1 The brake member 60 of the push-type writing instrument 1 has four brake protrusions 63, but Fig.17 The brake member 160 shown is different from the brake member 60 only in that it has three brake protrusions 163. By reducing the number of brake protrusions, the area of ​​the brake conical surface 164 is reduced compared with the brake conical surface 64 of the brake protrusion 63. Therefore, in the brake member 160, the reduction of the kinetic energy of the writing core 4 and the brake member 160 due to the friction resistance generated by the sliding contact between the brake conical surface 164 and the conical surface 14 and the elastic deformation of the brake protrusion 163 is smaller than that of the above-mentioned brake member 60. Therefore, the brake member 160 is used in the case where it is not necessary to reduce the kinetic energy compared with the case where the brake member 60 is used, for example, in the case where the writing core 4 is lighter, the spring constant of the spring 6 is smaller, etc.

[0089] Fig.18 It is a perspective view of still another braking member 260 . Fig.18 The brake member 260 shown is different from the brake member 260 in that it has three brake protrusions 263 but the width of the brake protrusions 263 is wider, that is, the circumferential length is longer. Fig.17The brake member 160 shown in the figure is different. By making the width of the brake protrusion wider, the area of ​​the brake conical surface 264 is increased compared with the brake conical surface 64 of the brake protrusion 63. In addition, the rigidity of the brake protrusion 263 with respect to the elastic deformation in the radial direction becomes higher than that of the brake protrusion 63. Therefore, compared with the above-mentioned brake member 60, the brake member 260 has a greater reduction in the kinetic energy of the writing core 4 and the brake member 260 due to the friction resistance generated by the sliding contact between the brake conical surface 264 and the conical surface 14 and the elastic deformation of the brake protrusion 263. Therefore, the brake member 260 is used in the case where the kinetic energy needs to be reduced compared with the case where the brake member 60 is used, for example, in the case where the writing core 4 is heavier, the spring constant of the spring 6 is larger, etc.

[0090] By adjusting the number, width and shape of the braking protrusions, the respective angles of the braking conical surface and the relative conical surface of the front pen barrel 10, the length in the axial direction, etc., it is possible to adjust to the appropriate desired friction resistance and elastic deformation corresponding to the weight of the pen core 4 and the braking member, the spring constant of the spring 6, etc., and to achieve the desired impact mitigation performance. For example, the number of braking protrusions of the braking member can be more than two. The two or more braking protrusions are preferably arranged at equal intervals along the circumferential direction. The number of protrusions of the braking member can also be one, and specifically, it can also be an integrated annular protrusion. In short, the braking member or the braking portion can be arbitrarily constructed as long as the outer surface of the pen core, that is, the writing body is constructed to cooperate with the conical surface of the pen barrel to brake the writing body when the writing body moves forward.

[0091] Fig.19 It is a longitudinal cross-sectional view of the non-writing state of the second push-type writing instrument 100. Compared with the first push-type writing instrument 1, the second push-type writing instrument 100 is different only in the shapes of the front pen barrel 110, the rear pen barrel 120 and the inner tube 130, and the other components are the same as those of the first push-type writing instrument 1. Compared with the front pen barrel 10 of the first push-type writing instrument 1, the front pen barrel 110 is different in that it has an internal thread portion formed on the inner surface of the rear end portion instead of the external thread portion.

[0092] Fig. 20 yes Fig.19 A longitudinal sectional view of the rear barrel 120 of the push-type writing instrument 100. Compared with the rear barrel 20 of the first push-type writing instrument 1, the rear barrel 120 is different in that it does not have an internal thread portion and a reduced diameter portion. In addition, two interlocking recesses 126 are formed at corresponding positions on two inner surfaces of the notch portion 24 that extend in the axial direction and are opposite to each other. Moreover, compared with the rear barrel 20 of the first push-type writing instrument 1, the overall length of the rear barrel 120 is formed shorter.

[0093] Fig.21 yes Fig.19A three-dimensional view of the inner cylinder 130 of the push-type writing instrument 100, Fig. 22 yes Fig.21 A longitudinal sectional view of the inner cylinder 130 of the first push-type writing instrument 1. Compared with the inner cylinder 30 of the first push-type writing instrument 1, the inner cylinder 130 is formed with two interlocking protrusions 131a extending in opposite directions in the circumferential direction at the portion connecting the flange portion 31 and the second clip holding portion 33. In addition, the first protrusion 138 protrudes radially outward more than the first protrusion 38 of the first push-type writing instrument 1. Specifically, the circumscribed circle of the two first protrusions 138 is slightly larger than the inner diameter of the rear pen barrel 120. Moreover, the portion forward of the elastic deformation portion 137 is formed to be longer than the corresponding portion of the inner cylinder 30 of the first push-type writing instrument 1, and an external threaded portion 111 is formed on its outer surface.

[0094] The assembly of the second push-type writing instrument 100 is basically the same as the assembly of the first push-type writing instrument 1. That is, the rotating body 40 and the operating member 50 are inserted while pressing from the front end opening of the inner tube 130. When the rotating body 40 and the operating member 50 are inserted over the elastic deformation portion 137, the rotating body 40 and the operating member 50 are locked by the rotating body 40 and the second protrusion 39, so that they will not fall off due to their own weight.

[0095] The inner tube 130 in a state where the rotating body 40 and the operating member 50 are assembled is inserted while being pressed from the rear end opening of the rear barrel 120. As a result, the second clip holding portion 33 is fitted with the first clip holding portion 25, the fitting surface 32 is fitted with the inner surface of the rear end portion of the rear barrel 20, and the corresponding fitting protrusions 131a of the inner tube 130 are fitted with the two fitting recesses 126 of the rear barrel 120. As a result, the rear barrel 120 is fitted with the inner tube 130.

[0096] When the inner cylinder 130 is mounted on the rear pen barrel 120, the first protrusion 138 of the elastic deformation portion 137 abuts against the inner surface of the rear pen barrel 120, causing the elastic deformation portion 137 to be elastically deformed in a manner of bending radially inward. As a result, similarly to the first push-type writing instrument 1, the rear end edge of the inner surface of the elastic deformation portion 137 protrudes to a position radially inward of the cylindrical outer surface of the cam member 41 of the rotating body 40. As a result, the front end edge or front end surface of the rotating body 40 is locked with the rear end edge or rear end surface of the elastic deformation portion 137, and the movement of the rotating body 40 and the operating member 50 is stopped. Therefore, when replacing the pen core, even if the front end opening of the rear pen barrel 120 is directed vertically downward, the rotating body 40 will not accidentally fall off from the rear pen barrel 120 and the inner cylinder 130.

[0097] Next, the inner cylinder 130 with the rear pen barrel 120 mounted thereon is screwed together with the front pen barrel 110 in such a manner that the pen core 4 and the spring 6 are stored therein, thereby completing the assembly of the push-type writing tool 100. That is, in the first push-type writing tool 1, the rear pen barrel 20 is screwed together with the front pen barrel 10, whereas in the second push-type writing tool 100, the inner cylinder 130 is screwed together with the front pen barrel 110. Thus, the rear pen barrel 120 or the inner cylinder 130 is prevented from being separated from the front pen barrel 110.

[0098] Specifically, in the first push-type writing implement 1, the inner cylinder 30 is connected to the rear pen barrel 20 by the engagement caused by the friction between the inner surface of the rear end portion of the rear pen barrel 20 and the engagement surface 32 of the inner cylinder 30. Therefore, in the case of a user with particularly strong writing pressure, the force is transmitted to the outer cam 34 of the inner cylinder 30 via the pen core 4 and the rotating body 40, and the inner cylinder 30 may also be separated from the rear pen barrel 20. On the other hand, in the second push-type writing implement 100, similarly, the inner cylinder 130 formed with the outer cam 34 is connected to the front pen barrel 110 by threaded connection, so that even in the case of a user with particularly strong writing pressure, the inner cylinder 130 will not be separated from the front pen barrel 110. In short, according to the second push-type writing implement 100, it is possible to prevent the inner cylinder 130 from coming out during writing. In addition, the rear pen barrel 120 is only loosely engaged with the inner cylinder 130, so the rear pen barrel 120 will not be separated.

[0099] The inner tube 130 fitted with the front barrel 110 may also be referred to as a rear barrel. In this case, the rear barrel 120 is a cylindrical member whose elastic deformation portion 137 is elastically deformed radially inward, and there is also a space between its outer surface and the clip member 5 for holding an article.

[0100] Fig.23 It is a longitudinal cross-sectional view of the non-writing state of the third push-type writing instrument 200. The components of the third push-type writing instrument 200 are different from the components of the first push-type writing instrument 1 and the second push-type writing instrument 100. However, the third push-type writing instrument 200 has a mechanism that prevents the inner cylinder 230 from coming out during writing by connecting the front pen barrel 210 and the inner cylinder 230 by means of a threaded connection, which is common to the second push-type writing instrument 100. However, the connection form of the rear pen barrel 220 and the inner cylinder 230 of the third push-type writing instrument 200 is different from the connection form of the rear pen barrel 120 and the inner cylinder 130 of the second push-type writing instrument 100.

[0101] The push-type writing instrument 200 has: a pen barrel 202, which has a front pen barrel 210, a rear pen barrel 220 and an inner tube 230; and a pen core 4, which is urged backward by a spring 6, and the push-type writing instrument 200 does not have a brake member. A pen clip portion 205 formed integrally with the rear pen barrel 220 is provided on the side of the pen barrel 202. The front end surface of the rotating body 240 abuts against the rear end surface of the pen core 4. An operating member 250 is arranged behind the rotating body 240. The operating member 250 has a cam surface 251, and the rotating body 240 has a cam receiving surface 244, and the cam receiving surface 244 is configured to cooperate with the cam surface 251 of the operating member 250. A first annular interlocking protrusion 227 is formed along the circumferential direction on the inner surface of the rear pen barrel 220.

[0102] Fig.24 yes Fig.23 A three-dimensional view of the inner cylinder 230 of the push-type writing instrument 200, Fig.25 yes Fig.24 2 is a longitudinal sectional view of the inner cylinder 230. A flange portion 231 is formed on the outer surface of the rear end portion of the inner cylinder 230. A pen clip portion 205 is formed in front of the flange portion 31. An outer cam 234 is formed on the inner surface of the rear end portion of the inner cylinder 230, and the outer cam 234 includes a plurality of protrusions extending in the front-rear direction.

[0103] On the outer surface of the inner cylinder 230, two U-shaped holes 236 are formed in the same manner as the U-shaped holes 36 of the first push-type writing tool 1. Two elastic deformation parts 237 are formed by dividing the two U-shaped holes 236. In addition, the recess 35 formed in the inner cylinder 30 of the first push-type writing tool 1 is not formed in the inner cylinder 230. The elastic deformation part 237 is in the shape of a cantilever beam extending backward. A first convex part 238 protruding radially outward is formed on the outer surface of the elastic deformation part 237. A second convex part 239 protruding radially inward is formed on the inner surface of the elastic deformation part 237. The first convex part 238 and the second convex part 239 are spherical protrusions.

[0104] The first protrusion 238 protrudes radially outward from the first protrusion 38 of the first push-type writing instrument 1. Specifically, the circumscribed circle of the two first protrusions 238 is slightly larger than the inner diameter of the rear pen barrel 220. The inscribed circle of the two second protrusions 239 is slightly smaller than the outer diameter of the front end of the rotating body 240. An external thread portion 111 is formed in the portion forward of the elastic deformation portion 237, and the external thread portion 111 is threadedly engaged with the internal thread portion formed on the inner surface of the rear end portion of the front pen barrel 210. An annular second mating protrusion 230a corresponding to the first mating protrusion 227 is formed behind the external thread portion 11.

[0105] The assembly of the third push-type writing instrument 200 is basically the same as the assembly of the second push-type writing instrument 100. That is, the rotating body 240 and the operating member 250 are inserted while being pressed from the front end opening of the inner tube 230. When the rotating body 240 and the operating member 50 are inserted over the elastic deformation portion 37, the rotating body 240 and the operating member 250 are locked by the rotating body 240 and the second protrusion 239, so that they will not fall off due to their own weight.

[0106] The inner cylinder 230 in a state where the rotating body 240 and the operating member 250 are assembled is inserted while being pressed from the rear end opening of the rear barrel 220. As a result, the second fitting protrusion 230a of the inner cylinder 230 passes over the first fitting protrusion 227 of the rear barrel 220. As a result, the rear barrel 220 and the inner cylinder 230 are fitted.

[0107] When the inner cylinder 230 is mounted on the rear pen barrel 220, the first protrusion 238 of the elastic deformation portion 237 abuts against the inner surface of the rear pen barrel 220, causing the elastic deformation portion 237 to elastically deform in a manner of bending radially inward. As a result, similarly to the first push-type writing instrument 1, the rear end edge of the inner surface of the elastic deformation portion 237 protrudes to a position radially inward of the outer diameter of the rotating body 240. As a result, the front end edge or front end surface of the rotating body 240 is locked with the rear end edge or rear end surface of the elastic deformation portion 237, and the movement of the rotating body 240 and the operating member 250 is stopped. Therefore, when replacing the pen core, even if the front end opening of the rear pen barrel 220 is directed vertically downward, the rotating body 240 will not accidentally fall off from the rear pen barrel 220 and the inner cylinder 230.

[0108] Next, the inner cylinder 230 to which the rear pen barrel 220 is attached is screwed together with the front pen barrel 210 so that the pen core 4 and the spring 6 are stored inside, thereby completing the assembly of the push-type writing tool 200. That is, in the first push-type writing tool 1, the rear pen barrel 20 is screwed together with the front pen barrel 10, whereas in the third push-type writing tool 200, the inner cylinder 230 is screwed together with the front pen barrel 210 in the same manner as the second push-type writing tool 100. Thus, the rear pen barrel 220 or the inner cylinder 230 is prevented from being separated from the front pen barrel 210.

[0109] Therefore, in the third push-type writing implement 200, similarly to the second push-type writing implement 100, since the inner tube 230 is connected to the front pen barrel 210 by screw connection, even in the case of a user with particularly strong writing pressure, the inner tube 230 will not be separated from the front pen barrel 210. In short, according to the third push-type writing implement 200, it is possible to prevent the inner tube 230 from coming out during writing. In addition, since the rear pen barrel 220 is only loosely fitted with the inner tube 230, the rear pen barrel 220 will not be separated either.

[0110] The inner cylinder 230 fitted with the front pen barrel 210 may also be referred to as a rear pen barrel. In this case, the rear pen barrel 220 is a cylindrical member that elastically deforms the elastic deformation portion 237 radially inward, and there is a space between its outer surface and the pen clip portion 205 for clamping an article.

[0111] According to the second push-type writing tool 100 and the third push-type writing tool 200, there are a front pen shaft, a rear pen shaft, and an inner cylinder with an external cam, and the front pen shaft and the inner cylinder are connected by a threaded connection, so the inner cylinder will not come off during writing. On the other hand, the rear pen shaft and the inner cylinder are loosely engaged, so the push-type writing tool 100 and the push-type writing tool 200 can be easily disassembled. The engagement of the rear pen shaft and the inner cylinder can be arbitrarily constructed as long as it can be easily released by hand. The connection between the front pen shaft and the inner cylinder can be arbitrarily constructed as long as it will not come off even in the case of a user with particularly strong writing pressure, and can be tightly engaged instead of threaded connection.

[0112] The refill 4 may be other types of writing bodies other than a ballpoint pen, such as a marker pen, a touch pen, and an eraser. In addition, part or all of the operating member 50 may be set as an erasing portion for erasing the handwriting produced by the push-type writing tool. The refill 4 may contain thermochromic ink containing a thermochromic colorant. In this case, the push-type writing tool is a push-type thermochromic writing tool, and the handwriting of the push-type writing tool can be thermochromic by using the friction heat generated when the friction body as the erasing member is rubbed.

[0113] Here, thermochromic ink refers to ink having the following properties: it maintains a specified color (first color) at room temperature (e.g., 25°C), changes to another color (second color) when heated to a specified temperature (e.g., 60°C), and then returns to its original color (first color) when cooled to a specified temperature (e.g., -5°C). For a push-type writing instrument using thermochromic ink, the second color is colorless, and heating the drawn line written in the first color (e.g., red) to become colorless is referred to as "elimination". Therefore, a friction body is used to rub the writing surface on which the drawn line is written to generate friction heat, thereby causing the drawn line to change to colorless, i.e., to be eliminated. Of course, the second color may also be a color other than colorless.

[0114] Description of Reference Numerals

[0115] 1. A push-type writing tool; 2. A pen holder; 3. A pen tip member; 4. A pen core; 6. A spring; 10. A front pen holder; 14. A tapered surface; 20. A rear pen holder; 22. A reduced diameter portion; 30. An inner tube; 34. An outer cam; 35. A recess; 36. A U-shaped hole; 37. An elastic deformation portion; 38. A first protrusion; 39. A second protrusion; 40. A rotating body; 41. A cam member; 42. A receiving member; 43. An inner cam; 50. An operating member; 60. A braking member; 61. A protrusion; 63. A braking protrusion; 64. A braking tapered surface.

Claims

1. A writing tool, characterized in that: The writing implement comprises: a first cylindrical member; a second cylindrical member inserted into the interior from one end of the first cylindrical member, the second cylindrical member having an elastic deformation portion on the side surface that can elastically deform outward and inward in the radial direction; and a cylindrical or columnar inner member inserted into the interior from one end of the second cylindrical member. A first engaging portion is provided on the outer surface of the elastic deformation portion or the inner surface of the first cylindrical member, A second engaging portion is provided on the inner surface of the elastic deformation portion, The first engaging portion is configured so that when the second cylindrical member is inserted into the first cylindrical member, the elastic deformation portion is deformed radially inward. The second engaging portion is configured such that, in a state before the second cylindrical member is inserted into the interior of the first cylindrical member, when the internal member is inserted into the interior of the second cylindrical member, the elastic deformation portion is deformed radially outward, and the deformed elastic deformation portion is restored after the insertion of the internal member.

2. The writing instrument according to claim 1, wherein: The first cylindrical member is a pen holder, the second cylindrical member is an inner cylinder inserted from the rear end of the pen holder, and the internal member is a rotating body or an operating member inserted from the front end of the inner cylinder.

3. The writing instrument according to claim 1, wherein: The writing tool also has a front pen shaft, the first tubular component is the rear pen shaft, the second tubular component is an inner cylinder inserted from the rear end of the rear pen shaft, the front pen shaft is threadedly connected to the inner cylinder, and the internal component is a rotating body or operating component inserted from the front end of the inner cylinder.

4. The writing instrument according to claim 1, wherein: The elastic deformation portion is in the shape of a cantilever beam extending rearward.

5. The writing instrument according to any one of claims 1 to 3, wherein: The first engaging portion or the second engaging portion is a protrusion.

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