Click action writing instrument

Abstract

A click-type writing instrument (1) includes a barrel (2), a refill (6) disposed in the barrel (2), and a first click mechanism including the refill (6) and an extension mechanism (10) configured to selectively project the refill (6) from a front end of the barrel (2) by the extension mechanism (10) by a click operation. The extension mechanism (10) is configured to advance the refill (6) by an amount greater than a click amount of the click operation.

Description

Technical Field

[0001] This invention relates to a push-button writing instrument. Background Technology

[0002] A press-type writing instrument has an operating part with a press member at the rear end of the barrel. By pressing the operating part forward against the force of a spring located inside the barrel, the instrument switches between a writing state (where the writing part, as the pen tip, protrudes from the top of the barrel) and a non-writing state (where the writing part is submerged within the barrel). Specifically, the press operation moves the press member forward along with a rotating body, causing the rotating body to rotate. Corresponding to the rotation of the rotating body during the press operation and the engagement or disengagement of the rotating body within the barrel, the press-type writing instrument switches between the writing and non-writing states.

[0003] Basically, the amount of actuation during a press operation, i.e., the amount of movement of the operating part, is approximately equal to the amount of movement of the rotating body and thus the writing part. Press-type writing instruments are known to be able to switch from a non-writing state to a writing state with less actuation than before (e.g., Patent Document 1). If less actuation is required, operability during press operation can be improved; for example, by reducing the amount of protrusion of the press member from the rear end of the pen barrel, a more diverse design appearance can be achieved.

[0004] The push-button writing instrument described in Patent Document 1 has a cylindrical extended cam. Convex curved working ends are provided at both ends of the extended cam in the front-rear direction, and a pin is provided on the outer circumferential surface of the extended cam. The working end at the front end of the extended cam is configured to abut against the inclined surface of the push-button cam, and the working end at the rear end of the extended cam is configured to abut against the inclined surface of the direct-acting cam. The inclined surfaces of the push-button cam and the direct-acting cam are inclined in opposite directions. The pin of the extended cam is disposed in an inclined groove for the extended cam, which is located on the pen barrel side and extends obliquely in the circumferential direction. When the direct-acting cam is advanced by a push-button operation, the pin of the extended cam is guided by the inclined groove of the extended cam, and the extended cam advances while rotating about its axis. At this time, with the rotation of the extended cam, the working end at the rear end of the extended cam moves along the inclined surface of the direct-acting cam, thereby causing the advance of the extended cam to be greater than that of the direct-acting cam. On the other hand, as the extension cam rotates and moves forward, the actuating end of the front end of the extension cam moves along the inclined surface of the press cam, so that the press cam is pressed and moves forward. The forward movement of the press cam is greater than that of the extension cam. As a result, the forward movement of the press cam and the pen refill that abuts against the press cam is greater than the movement of the operating part generated by the press operation. Therefore, it is possible to switch from the non-writing state to the writing state with a smaller movement of the operating part.

[0005] However, as a push-button writing instrument, multi-core writing instruments with multiple refills and the ability to selectively insert desired refills are known (e.g., Patent Document 2). The multi-core writing instrument described in Patent Document 2 includes: a pen barrel; a first writing body and two second writing bodies arranged at predetermined intervals along the inner circumferential surface of the pen barrel; a first push-button member provided at the rear end of the first writing body, protruding rearward from the pen barrel, configured to selectively cause the first writing body to protrude from the front end of the pen barrel; and a second push-button member provided at the rear end of the second writing body, protruding radially outward from the pen barrel, configured to selectively cause the second writing body to protrude from the front end of the pen barrel, wherein the protrusion of the first writing body is released by operation of the first push-button member.

[0006] According to the multi-core writing instrument described in Patent Document 2, the second writing element can be protruded by pressing two second actuating members located on the side of the pen barrel forward. Since multiple second actuating members are provided, the pressing operation must be performed while simultaneously identifying the second actuating member corresponding to the desired second writing element. On the other hand, the first writing element can be protruded by pressing a single first actuating member that protrudes rearward from the pen barrel. Therefore, according to the multi-core writing instrument described in Patent Document 2, the first writing element can be more easily and selectively protruded and inserted compared to the second writing element.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2015-174381

[0010] Patent Document 2: Japanese Patent Application Publication No. 2016-10952 Summary of the Invention

[0011] The problem the invention aims to solve

[0012] In the push-button writing instrument described in Patent Document 1, actuating ends are provided at both ends of the extension cam, and opposing inclined surfaces are provided on the direct-acting cam and the push-button cam, respectively. Therefore, the overall length of the push-button mechanism becomes longer. As a result, the length of the pen refill that can be disposed in the pen barrel becomes shorter, or the overall length of the push-button writing instrument becomes longer. In particular, if the length of the pen refill becomes shorter, the amount of ink that can be held is reduced, resulting in a shorter line length that can be written with one pen refill.

[0013] Furthermore, compared to writing instruments with a single writing tip, multi-tipped writing instruments typically require a larger amount of actuation, or movement of the operating part, to switch each writing tip from a non-writing state to a writing state. For example, when the first writing tip is in the writing state, to switch the second writing tip to the writing state, a second actuating member corresponding to the second writing tip is actuated. As the second actuating member moves forward, the second writing tip moves forward, and the first writing tip moves backward. At this time, inside the tip of the conical pen barrel, the first writing tip, which needs to be switched backward, does not interfere with the second writing tip, which is moving forward. Therefore, compared to writing instruments with a single writing tip, multi-tipped writing instruments place the positions of each writing tip in the non-writing state, specifically the writing part, further back. As a result, the amount of actuation required to switch a multi-tipped writing instrument from a non-writing state to a writing state is larger. Therefore, in multi-core writing instruments, it is preferable to have a click mechanism that enables click operation with less click amount.

[0014] In particular, in the multi-core writing instrument described in Patent Document 2, the first actuating member protrudes rearward from the pen barrel. Therefore, to ensure the required amount of actuation, the protrusion of the first actuating member is larger compared to a writing instrument with a single writing surface. Consequently, compared to the actuation operation of the second actuating member located on the side of the pen barrel, the amount of hand movement and finger movement resulting from the change in pen-holding method is greater when the first actuating member is actuated. Therefore, it is preferable to further reduce the amount of actuation required to switch from a non-writing state to a writing state. Furthermore, from an aesthetic point of view, it is also preferable to further reduce the amount of actuation of the first actuating member protruding from the rear end of the pen barrel.

[0015] The object of the present invention is to provide a clickable writing instrument having a click mechanism that enables click operation with less click amount, or a clickable writing instrument having a click mechanism that enables click operation with less click amount and is more compact.

[0016] Solution for solving the problem

[0017] According to the present invention, the following (1) to (19) are provided as means for achieving the above-mentioned objectives.

[0018] (1) A press-type writing instrument, characterized in that the press-type writing instrument comprises: a pen barrel; a first writing body disposed within the pen barrel; and a first press mechanism comprising the first writing body and an extension mechanism, configured to selectively cause the first writing body to protrude from the front end of the pen barrel by means of the extension mechanism during a press operation, wherein the extension mechanism is configured to cause the first writing body to advance in such a way that the advance amount of the first writing body is greater than the press amount of the press operation.

[0019] (2) According to the push-button writing instrument of (1), wherein the extension mechanism comprises: an extension cam disposed within the pen barrel in a manner capable of moving back and forth and rotating about a central axis, and having a first cam portion and a second cam portion facing forward; a first cam support portion disposed on the inner circumferential surface of the pen barrel and facing rearward; and a push-button cam disposed in front of the extension cam in a manner capable of moving back and forth within the pen barrel, and having a second cam support portion facing rearward, wherein the first writing element advances along with the forward movement of the push-button cam, and one of the first cam portion and the first cam support portion has a first inclined surface inclined circumferentially, and the other... The device has a first actuating part that can slide along the first inclined surface. In the second cam part and the second cam support part, one has a second inclined surface that is inclined in the circumferential direction in the opposite direction to the first inclined surface, and the other has a second actuating part that can slide along the second inclined surface. The push-button writing instrument is configured such that when the extension cam is advanced by push-button operation, the first cam part and the first cam support part cooperate to rotate the extension cam. Accompanying the advancement and rotation of the extension cam, the second cam part and the second cam support part cooperate to advance the push-button cam. The advancement amount of the first writing element is greater than the advancement amount of the extension cam.

[0020] (3) The push-button writing instrument according to (1), wherein the push-button writing instrument further comprises: at least one second writing body disposed within the pen barrel; and a second push-button mechanism having the second writing body, configured to selectively cause the second writing body to protrude from the front end of the pen barrel by means of a push-button operation.

[0021] (4) The push-button writing instrument according to (3), wherein the protrusion of the first writing element can be released by the push-button operation of the first push-button mechanism.

[0022] (5) The push-button writing instrument according to (3), wherein the extension mechanism comprises: an extension cam disposed within the pen barrel in a manner capable of moving back and forth and rotating about a central axis, and having a first cam portion and a second cam portion facing forward; a first cam support portion disposed on the inner circumferential surface of the pen barrel and facing rearward; and a push-button cam disposed in front of the extension cam in a manner capable of moving back and forth within the pen barrel, and having a second cam support portion facing rearward, wherein the first writing element advances along with the forward movement of the push-button cam, and one of the first cam portion and the first cam support portion has a first inclined surface inclined circumferentially, and the other... The device has a first actuating part that can slide along the first inclined surface. In the second cam part and the second cam support part, one has a second inclined surface that is inclined in the circumferential direction in the opposite direction to the first inclined surface, and the other has a second actuating part that can slide along the second inclined surface. The push-button writing instrument is configured such that when the extension cam is advanced by push-button operation, the first cam part and the first cam support part cooperate to rotate the extension cam. Accompanying the advancement and rotation of the extension cam, the second cam part and the second cam support part cooperate to advance the push-button cam. The advancement amount of the first writing element is greater than the advancement amount of the extension cam.

[0023] (6) The push-button writing instrument according to (5), wherein, in the first cam portion and the first cam support portion, one has at least two first inclined surfaces arranged symmetrically about a central axis, and the other has at least two first working portions arranged symmetrically about a central axis in a corresponding manner; in the second cam portion and the second cam support portion, one has at least two second inclined surfaces arranged symmetrically about a central axis, and the other has at least two second working portions arranged symmetrically about a central axis in a corresponding manner.

[0024] (7) The push-button writing instrument according to (5), wherein the extended cam is formed in a cylindrical shape and the first cam portion is disposed at a position radially outward than the second cam portion.

[0025] (8) The push-button writing instrument according to (5), wherein the extended cam is formed in a cylindrical shape, and the first cam portion and the second cam portion are arranged on the same circumference.

[0026] (9) The push-button writing instrument according to (5), wherein at least one of the first action portion and the second action portion has an inclined surface that is at least partially complementary to the corresponding first inclined surface or the second inclined surface.

[0027] (10) The push-button writing instrument according to (5), wherein at least one of the first action part and the second action part has a convex surface.

[0028] (11) According to the push-button writing instrument of (5), wherein the pitch of the second inclined surface is set to be the same as or greater than the pitch of the first inclined surface.

[0029] (12) The push-button writing instrument according to (1), wherein the push-button writing instrument further comprises a pen clip, the pen clip having: a pen clip body; and a U-shaped leaf spring, which includes a first end mounted on the pen barrel, a second end mounted on the pen clip body, and a curved portion connecting the first end and the second end, the curved portion having a concave inflection point on the first end side.

[0030] (13) The push-button writing instrument according to (12), wherein the pen clip is configured such that the point of proximity to the central axis of the pen barrel is located at the bend.

[0031] (14) The push-button writing instrument according to (12), wherein the pen clip body has an abutting portion that can abut against the pen barrel to limit the opening of the pen clip.

[0032] (15) The push-button writing instrument according to (12), wherein the push-button writing instrument further comprises an operating part, the operating part being configured to protrude rearward from the pen barrel and selectively cause the first writing element to protrude from the front end of the pen barrel, the operating part being disposed eccentrically relative to the central axis of the pen barrel in a manner away from the pen clip.

[0033] (16) The push-button writing instrument according to (15), wherein the push-button writing instrument further comprises: at least one second writing body disposed within the pen barrel; and a second push-button mechanism having the second writing body, configured to selectively cause the second writing body to protrude from the front end of the pen barrel by means of a push-button operation.

[0034] (17) The push-button writing instrument according to (15) further includes a spring that applies a force to the operating part in the rearward direction, wherein the axial arrangement of the operating part is different in the writing state and the non-writing state.

[0035] (18) The push-button writing instrument according to (15), wherein the push-button writing instrument is configured such that the operating part in the writing state is disposed at a fixed position between the forward limit and the backward limit in the axial direction.

[0036] (19) According to (18) the push-button writing instrument, wherein an insertion hole for the operating part to pass through is formed at the rear end of the pen barrel, and a fixing protrusion is formed on the inner wall surface of the insertion hole, and the push-button writing instrument is configured such that the operating part is engaged with the fixing protrusion and disposed in the fixed position.

[0037] The effects of the invention

[0038] According to the present invention, a common effect is achieved in providing a clickable writing instrument having a click mechanism that enables click operation with less click amount. Attached Figure Description

[0039] Figure 1 This is a longitudinal sectional view of the writing instrument of the first embodiment in its non-writing state.

[0040] Figure 2 yes Figure 1 A longitudinal sectional view of the writing instrument in its writing state.

[0041] Figure 3 yes Figure 1 An exploded assembly diagram of the extension mechanism of a writing instrument.

[0042] Figure 4 yes Figure 1 A three-dimensional diagram of an extended cam of a writing instrument.

[0043] Figure 5 yes Figure 1 A bottom view of the extended cam of the writing instrument.

[0044] Figure 6 yes Figure 1 A three-dimensional diagram of the pusher cam of a writing instrument.

[0045] Figure 7 yes Figure 1 A three-dimensional diagram of a rotating solid of a writing instrument.

[0046] Figure 8 yes Figure 1 A longitudinal sectional view of the rear end of the pen barrel of a writing instrument.

[0047] Figure 9 It means Figure 1 A schematic diagram showing the relationship between the cams in the extension mechanism.

[0048] Figure 10 It is a phased representation. Figure 1 A schematic diagram of the operation of the extension mechanism.

[0049] Figure 11 This is a longitudinal sectional view of the writing instrument in the non-writing state according to the second embodiment.

[0050] Figure 12 yes Figure 11 A longitudinal sectional view of the writing instrument in its writing state.

[0051] Figure 13 yes Figure 11 An exploded assembly diagram of the extension mechanism of a writing instrument.

[0052] Figure 14 yes Figure 11 A three-dimensional diagram of an extended cam of a writing instrument.

[0053] Figure 15 yes Figure 11 A bottom view of the extended cam of the writing instrument.

[0054] Figure 16 yes Figure 11 A three-dimensional diagram of the pusher cam of a writing instrument.

[0055] Figure 17 yes Figure 11 A three-dimensional diagram of a rotating solid of a writing instrument.

[0056] Figure 18 yes Figure 11 A longitudinal sectional view of the rear end of the pen barrel of a writing instrument.

[0057] Figure 19 This is a longitudinal sectional view of the writing instrument in the non-writing state according to the third embodiment.

[0058] Figure 20 yes Figure 19 A longitudinal sectional view of the writing instrument in its writing state.

[0059] Figure 21 yes Figure 19 An exploded assembly diagram of the extension mechanism of a writing instrument.

[0060] Figure 22 yes Figure 19 A three-dimensional diagram of an extended cam of a writing instrument.

[0061] Figure 23 yes Figure 19 A longitudinal section view of the extended cam of the writing instrument.

[0062] Figure 24 yes Figure 19 A three-dimensional diagram of the pusher cam of a writing instrument.

[0063] Figure 25 yes Figure 19 A three-dimensional diagram of a rotating solid of a writing instrument.

[0064] Figure 26This is a perspective view of the extended cam of the writing instrument according to the fourth embodiment.

[0065] Figure 27 (A) and Figure 27 (B) are the front view and side view of the writing instrument in the non-writing state of the fifth embodiment, respectively.

[0066] Figure 28 (A) is along Figure 27 A cross-sectional view of the writing tool for the (B) BB line. Figure 28 (B) is along Figure 27 A cross-sectional view of the writing tool for the AA line of (A).

[0067] Figure 29 Is with Figure 28 (B) is a longitudinal sectional view of the writing instrument in its writing state.

[0068] Figure 30 (A) is along Figure 28 A cross-sectional view of the writing tool for the CC line in (B). Figure 30 (B) is along Figure 28 A cross-sectional view of the writing tool for the DD line in (B). Figure 30 (C) is along Figure 28 A cross-sectional view of the writing tool for the EE line of (B).

[0069] Figure 31 yes Figure 27 A three-dimensional diagram of the extension mechanism of a writing instrument.

[0070] Figure 32 (A) to Figure 32 (D) are the front view, side view, and along the pen barrel, respectively. Figure 32 (B) The cross-sectional view of the pen barrel after the GG line and along Figure 32 A cross-sectional view of the pen shaft following the FF line of (A).

[0071] Figure 33 (A) to Figure 33 (C) are the perspective view, longitudinal section view and top view of the inner cylinder, respectively.

[0072] Figure 34 (A) and Figure 34 (B) are respectively Figure 27 A perspective view and a bottom view of the extended cam of the writing instrument.

[0073] Figure 35 (A) and Figure 35 (B) are respectively Figure 27 A perspective view and a longitudinal section view of the pusher cam of a writing instrument.

[0074] Figure 36 yes Figure 27 A three-dimensional diagram of a rotating solid of a writing instrument.

[0075] Figure 37 (A) to Figure 37 (C) are a perspective view, a side view, and a bottom view of a second click component, respectively.

[0076] Figure 38 yes Figure 27 A three-dimensional diagram of the spacers of a writing instrument.

[0077] Figure 39 yes Figure 27 A three-dimensional diagram of a pen clip, a writing instrument.

[0078] Figure 40 It is a 3D diagram of the leaf spring of the pen clip.

[0079] Figure 41 This is a side view of the leaf spring of the pen clip.

[0080] Figure 42 This is a longitudinal sectional view of the pen clip body.

[0081] Figure 43 (A) indicates the pen clip is closed. Figure 27 A longitudinal sectional view of the rear of the writing instrument. Figure 43 (B) indicates the pen clip is open. Figure 27 A longitudinal sectional view of the rear of a writing instrument.

[0082] Figure 44 It is a three-dimensional diagram of the crown. Detailed Implementation

[0083] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In all the drawings, common reference numerals are used to label corresponding structural elements.

[0084] Figure 1 This is a longitudinal sectional view of the writing instrument 1 in its non-writing state according to the first embodiment. Figure 2 yes Figure 1 A longitudinal sectional view of writing instrument 1 in its writing state. Additionally, Figure 3 yes Figure 1 An exploded assembly diagram of the extension mechanism 10 of the writing instrument 1. The writing instrument 1 is a push-button writing instrument.

[0085] The writing instrument 1 includes: a pen barrel 2, which is cylindrical and has a front pen barrel 3 and a rear pen barrel 4; a crown 5, which has a pen clip 5a; a pen core 6, which serves as a first writing element, is disposed within the pen barrel 2 and has a writing portion 6a at one end; and a spring 7, which applies force to the pen core 6 rearward. The crown 5 is fitted into the rear end of the rear pen barrel 4, or the crown 5 may also be included and referred to as the pen barrel 2. The rear end of the front pen barrel 3 is inserted into the interior of the front end of the rear pen barrel 4 and is fitted by a threaded connection. The crown 5 may also not have a pen clip 5a. In this case, the crown 5 may also be integrally formed with the rear pen barrel 4. In this specification, in the axial direction of the writing instrument, the writing portion side is defined as the "front" side, and the side opposite to the writing portion is defined as the "rear" side.

[0086] An extension mechanism 10 is disposed inside the rear end of the pen barrel 2, i.e., the rear end of the rear pen barrel 4. A push-button 8 is disposed behind the extension mechanism 10 as a push-operation part. The extension mechanism 10 is a push-operation mechanism that moves the pen tip 6 in the front-to-back direction within the pen barrel 2 using a push-operation. The extension mechanism 10 may also include the crown 5 and the push-button 8. The state in which the writing part 6a is submerged within the pen barrel 2 is called the non-writing state. Figure 1 The state in which the writing part 6a protrudes from the pen barrel 2 is called the writing state. Figure 2 The pen refill 6 and the extension mechanism 10 can also be referred to together as the press mechanism.

[0087] The extension mechanism 10 mainly comprises: an outer cam 20 disposed on the inner circumferential surface of the pen barrel 2, specifically the inner circumferential surface of the pen barrel 4; an extension cam 30 formed in a cylindrical shape; a press cam 40 formed in a cylindrical shape; and a rotating body 50 formed in a cylindrical shape. The press button 8, the extension cam 30, the press cam 40, and the rotating body 50 are sequentially arranged from the rear end side inside the pen barrel 2.

[0088] The crown 5 is formed as a cylinder open at both ends. The pen clip 5a extends laterally from the outer circumferential surface of the rear end of the crown 5. Four limiting grooves 5b extending along the axial direction are provided at equal intervals along the circumferential direction on the inner circumferential surface of the front end of the crown 5. The push button 8 is formed as a cylinder closed at one end. Four limiting protrusions 8a extending along the axial direction are provided at equal intervals along the circumferential direction on the outer circumferential surface of the front end of the push button 8. In the assembled state, the limiting protrusions 8a of the push button 8 are respectively housed within the limiting grooves 5b of the crown 5. Therefore, the push button 8, inserted through the front opening of the crown 5, is restricted from rotating around the central axis but can move back and forth.

[0089] Figure 4 yes Figure 1 A three-dimensional view of the extension cam 30 of the writing instrument 1. Figure 5 yes Figure 1A bottom view of the extended cam 30 of the writing instrument 1. The extended cam 30 has a cylindrical cam body 31 and a large-diameter portion 32 with a diameter larger than that of the cam body 31. A rotating cam portion 33 is formed on the front end face of the large-diameter portion 32. The rotating cam portion 33 has two first inclined surfaces 34 that are inclined in the circumferential direction. The two first inclined surfaces 34 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extended cam 30. The rotating cam portion 33 constitutes the first cam portion.

[0090] An ejector cam portion 35 is formed in front of the cam body 31. The ejector cam portion 35 has two second inclined surfaces 36 that are inclined in the circumferential direction in the opposite direction to the first inclined surface 34, and a flat portion 37 provided at the apex of the second inclined surface 36. The two second inclined surfaces 36 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 30. The ejector cam portion 35 constitutes the second cam portion.

[0091] like Figure 5 As shown, the rotary cam portion 33 is positioned radially outward from the ejector cam portion 35; therefore, the rotary cam portion 33 and the ejector cam portion 35 constitute a double cam surface that is radially adjacent. The rotary cam portion 33 is positioned rearward from the ejector cam portion 35. Alternatively, the rotary cam portion 33 and the ejector cam portion 35 may be positioned at the same location in the axial direction. In other embodiments described later, such as... Figure 23 As shown, the rotating cam 33 can also be positioned in front of the ejection cam 35.

[0092] In the extension cam 30, the first inclined surface 34 of the rotating cam portion 33 and the second inclined surface 36 of the ejection cam portion 35 have different inclination angles, i.e., different pitches. Pitch refers to the length in the axial direction when an inclined surface arranged circumferentially completes one revolution around the central axis in a 360-degree circle. Specifically, in the writing instrument 1, the pitch of the second inclined surface 36 is twice the pitch of the first inclined surface 34.

[0093] Figure 6 yes Figure 1A perspective view of the press cam 40 of the writing instrument 1. Two first protrusions 41 extending along the axial direction are provided at equal intervals along the circumferential direction on the outer peripheral surface of the front side of the press cam 40. A push-out cam support 42 is formed on the rear end face of the two first protrusions 41. The push-out cam support 42 has a third inclined surface 43 that is inclined along the circumferential direction. The third inclined surface 43 is inclined in the same direction and at the same angle as the second inclined surface 36 of the extending cam 30, and is configured to cooperate with the second inclined surface 36. A second protrusion 44 extending along the axial direction is formed on the outer surface of the front side of the first protrusions 41. A series of cam surfaces 45, consisting of multiple peaks and multiple valleys, is formed on the front end face of the press cam 40. The front end face of the second protrusion 44 constitutes a portion of the cam surface 45. The push-out cam support 42 constitutes the second cam support.

[0094] Figure 7 yes Figure 1 A perspective view of the rotating body 50 of the writing instrument 1. A small-diameter portion 51 is formed at the rear end of the rotating body 50, which is inserted into the snap cam 40 for centering. A protruding inner cam 53 is formed in front of the small-diameter portion 51 by dividing it with a large-diameter portion 52. The inner cam 53 has four inner cam protrusions 54 extending along the axial direction. The four inner cam protrusions 54 are arranged at equal intervals along the circumference. A cam support surface 55 is provided on the rear end face of the inner cam protrusions 54 as an inclined surface in the circumferential direction. The cam support surface 55 and the cam surface 45 of the snap cam 40 are partially inclined in the same direction and at the same angle, configured to cooperate with the cam surface 45.

[0095] Figure 8 yes Figure 1 The image shows a longitudinal sectional view of the rear end of the pen barrel 4 of the writing instrument 1. As described above, a protruding outer cam 20 is provided on the inner circumferential surface of the pen barrel 4. The outer cam 20 has two outer cam protrusions 23. The two outer cam protrusions 23 are arranged at equal intervals along the circumferential direction. A rotating cam support portion 21 is formed on the rear end face of the outer cam 20. A locking cam surface 22 is formed on the front end face of the outer cam 20.

[0096] The rotary cam support 21 has a fourth inclined surface 24 that is circumferentially inclined. The fourth inclined surface 24 is inclined in the same direction and at the same angle as the first inclined surface 34 of the rotary cam portion 33 of the extended cam 30, and is configured to cooperate with the first inclined surface 34. The locking cam surface 22 has serrated saw bevels 25 and a groove 26 extending rearward. In summary, each outer cam protrusion 23 has a fourth inclined surface 24 formed on its rear end face, and two saw bevels 25 and a groove 26 between the two saw bevels 25 formed on its front end face. A guide groove 27 is formed between the two outer cam protrusions 23. The rotary cam support 21 constitutes the first cam support.

[0097] Reference Figures 1 to 3 This instruction manual describes the configuration of the components of the writing instrument 1. An extension cam 30 is inserted into the rear opening of the pen barrel 4. The rotating cam portion 33 of the extension cam 30 is configured to cooperate with the outer cam 20 inside the pen barrel 2, particularly the rotating cam support portion 21. A push button 8 is inserted into the rear opening of the pen barrel 4, and a top crown 5 fits onto the rear opening of the pen barrel 4 from above the push button 8. The push button 8 is configured such that its front end abuts against the rear end end of the extension cam 30. A push cam 40 is inserted into the front opening of the pen barrel 4, and the push cam 40 is inserted into the front opening of the extension cam 30. The ejection cam portion 35 of the extension cam 30 is configured to cooperate with the ejection cam support portion 42 of the push cam 40. A rotating body 50 is inserted into the front opening of the pen barrel 4, and the small-diameter portion 51 of the rotating body 50 is inserted into the front opening of the push cam 40. Thus, the cam surface 45 of the push cam 40 and the cam support surface 55 of the rotating body 50 are configured to cooperate. The front pen barrel 3, which is equipped with the pen refill 6 and the spring 7, is threadedly engaged with the rear pen barrel 4 by inserting the pen refill 6 into the front opening of the rotating body 50.

[0098] Figure 9 It means Figure 1 A schematic diagram showing the relationship between the cams of the extension mechanism 10. That is... Figure 9 This is a schematic diagram showing the positional relationships of the top crown 5, the push button 8, the outer cam 20, the extension cam 30, the push cam 40, and the rotating body 50, particularly the positional relationship between the rotating cam portion 33 and the rotating cam support portion 21, and the positional relationship between the ejection cam portion 35 and the ejection cam support portion 42. In the diagram, the upper part represents the rear side of the writing instrument 1, and the lower part represents the front side of the writing instrument 1. Figure 9 In this design, regarding the cams or protrusions of each component, to clearly define their relative positional relationships, their positions and dimensions in the radial and axial directions, as well as their shapes, are abstracted and expanded circumferentially. For example, in the extended cam 30, the large-diameter portion 32 having a rotating cam portion 33 with a first inclined surface 34 and the cam body 31 having an ejector cam portion 35 with a second inclined surface 36 are schematically and integrally shown, and the full length of the first inclined surface 34 is also shown in a shortened manner. In the push cam 40, the first protrusion 41 and the second protrusion 44 having a third inclined surface 43 are schematically and integrally shown.

[0099] The second protrusion 44 of the push cam 40 is disposed within the guide groove 27 between the outer cam protrusions 23. Therefore, the push cam 40 is restricted from rotating about its central axis and is capable of moving back and forth. The first inclined surface 34 of the extension cam 30 and the fourth inclined surface 24 of the outer cam 20 are configured to abut against each other, and the second inclined surface 36 of the extension cam 30 and the third inclined surface 43 of the push cam 40 are configured to abut against each other. Figure 9Since the writing instrument 1 is in a non-writing state, the inner cam protrusions 54 of the rotating body 50 are respectively disposed in the corresponding slots 26 or guide slots 27. The cam surface 45 of the push cam 40 and the cam support surface 55 of the rotating body 50 are configured to abut against each other.

[0100] The rotating body 50 is forced backward by the pen refill 6, which is pushed backward by the spring 7. The actuating cam 40 is forced backward by the contact between the cam support surface 55 of the rotating body 50 and the cam surface 45 of the actuating cam 40. The extending cam 30 is forced backward by the contact between the third inclined surface 43 of the actuating cam 40 and the second inclined surface 36 of the extending cam 30. The actuating button 8 is forced backward by the contact between the rear end face of the extending cam 30 and the front end face of the actuating button 8.

[0101] Figure 10 It is a phased representation. Figure 1 The schematic diagram of the operation of the extension mechanism 10 is a schematic diagram showing the switch from the non-writing state to the writing state. Figure 10 (A) and Figure 9 The same applies to the extension mechanism 10 of the writing instrument 1 in its non-writing state.

[0102] since Figure 10 Starting from the state shown in (A), a press operation is performed to press the push button 8 forward. The forward movement of the push button 8 caused by the press operation moves the extension cam 30 forward. When the extension cam 30 moves forward, the rotating cam portion 33 of the extension cam 30 cooperates with the rotating cam support portion 21 of the outer cam 20, causing the extension cam 30 to rotate about its central axis relative to the rear pen lever 4. That is, the first inclined surface 34 slides along the fourth inclined surface 24 in the lower left direction in the figure, while the extension cam 30 moves forward and rotates simultaneously. On the other hand, accompanying the forward movement and rotation of the extension cam 30, the push-out cam portion 35 of the extension cam 30 cooperates with the push-out cam support portion 42 of the push cam 40, causing the push cam 40 to move forward. That is, the third inclined surface 43 slides relative to the second inclined surface 36, causing the push cam 40 to move forward. Furthermore, the push-button cam 40 is positioned within the guide groove 27 of the outer cam 20 via the second protrusion 44, thereby restricting its rotation around the central axis. Additionally, as the push-button cam 40 advances, the rotating body 50 and the pen refill 6 are pressed against the force of the spring 7 and advance as a unit.

[0103] In summary, through the cooperation of the rotating cam portion 33 of the extended cam 30 and the rotating cam support portion 21 of the outer cam 20, the extended cam 30 generates rotational movement. Due to the rotation of the extended cam 30, the push-out cam portion 35 of the extended cam 30 cooperates with the push-out cam support portion 42 of the push-out cam 40, increasing the advance of the push-out cam 40 relative to the advance of the extended cam 30. The increase in the advance of the push-out cam 40 can be geometrically designed by the following tilt angles or pitches: the tilt angle or pitch of the first inclined surface 34 of the rotating cam portion 33 or the fourth inclined surface 24 of the rotating cam support portion 21 that determines the rotation amount (rotation angle) of the extended cam 30; and the tilt angle or pitch of the second inclined surface 36 of the push-out cam portion 35 or the third inclined surface 43 of the push-out cam support portion 42 that generates the advance corresponding to the rotation amount.

[0104] For example, when the pitch of the second inclined surface 36 of the ejector cam 35 is set to be the same as the pitch of the first inclined surface 34 of the rotary cam 33, the amount of movement of the pen refill 6 becomes twice the amount of movement of the press button 8 generated by the press operation. Furthermore, when the pitch of the second inclined surface 36 of the ejector cam 35 is set to twice the pitch of the first inclined surface 34 of the rotary cam 33, the amount of movement of the pen refill 6 becomes three times the amount of movement of the press operation.

[0105] Therefore, if from Figure 10 Starting from state (A), press the push button 8 using the push button operation, causing the push button 8 to advance a distance D11. Then, the rotating body 50 and the pen refill 6 advance a distance D21 greater than the distance D11. Figure 10 (B)). If the button 8 is pressed further, causing it to advance a distance D12, the rotating body 50 and the pen refill 6 will advance a distance D22 greater than the distance D21. Figure 10 (C)). Furthermore, in Figure 10 In state (C), the inner cam protrusion 54 of the rotating body 50 is positioned in the corresponding groove 26 or guide groove 27, thus restricting the rotation of the rotating body 50 around the central axis. Furthermore, as described above, the rotating body 50 is always subjected to a rearward force by the spring 7.

[0106] If from Figure 10 Starting from state (C), further pressing the push button 8 causes the rotating body 50 to advance, and the inner cam protrusion 54 passes over the groove 26 or guide groove 27, thus releasing the restriction on the rotation of the rotating body 50. Figure 10(D)). At this time, the cam surface 45 of the push cam 40 cooperates with the cam support surface 55 of the rotating body 50 to make the rotating body 50 rotate about the central axis. That is, bearing the axial force generated by the forward movement caused by the push operation and the axial force generated by the action of the spring 7, the cam support surface 55 of the rotating body 50, which is a slope, is pressed against the cam surface 45, which is composed of multiple peaks and multiple valleys, and bears the circumferential component force. Since the rotation of the push cam 40 is restricted, the rotating body 50 rotates. The rotation of the rotating body 50 is stopped by the inner cam protrusion 54 locking onto the saw bevel 25 that constitutes the locking cam surface 22. Figure 10 (E)), writing tool 1 enters writing state.

[0107] If the writing instrument 1 is pressed again while in the writing state, the rotating body 50 advances and the locking between the inner cam protrusion 54 and the locking cam surface 22 is released. At this time, the cam surface 45 of the pressing cam 40 and the cam support surface 55 of the rotating body 50 cooperate again, causing the rotating body 50 to rotate. As a result, the inner cam protrusion 54 of the rotating body 50 is respectively positioned in the groove 26 or the guide groove 27, and with the force of the spring 7, the rotating body 50 and the pen refill 6 retract, and the writing instrument 1 enters a non-writing state. At this time, the extension cam 30 rotates in the opposite direction to the case of switching from the non-writing state to the writing state, returning to the original state. Figure 10 The state shown in (A).

[0108] As described above, according to the extension mechanism 10, the advance of the pen tip 6 can be increased compared to the amount of click generated by the click operation, thus enabling the click operation to be performed with less click amount.

[0109] The following describes the extension mechanisms of other embodiments.

[0110] Figure 11 This is a longitudinal sectional view of the writing instrument 100 in its non-writing state according to the second embodiment. Figure 12 yes Figure 11 A longitudinal sectional view of the writing instrument 100 in its writing state. Additionally, Figure 13 yes Figure 11 An exploded assembly diagram of the extension mechanism of the writing instrument 100. The writing instrument 100 is a push-button type writing instrument.

[0111] Compared with the writing instrument 1 of the first embodiment, the writing instrument 100 differs in the shape of the rear pen barrel 104 and the extension mechanism 110. The extension mechanism 110 mainly includes an outer cam 120, an extension cam 130, a push cam 140, and a rotating body 150 provided on the inner peripheral surface of the rear pen barrel 104.

[0112] Figure 14 yes Figure 11A three-dimensional view of the extension cam 130 of the writing instrument 100. Figure 15 yes Figure 11 A bottom view of the extended cam 130 of the writing instrument 100. The extended cam 130 has a cylindrical cam body 131. A rotating cam portion 133 and a pushing cam portion 135 are formed on the front end face of the cam body 131. Specifically, Figure 15 In the bottom view, the annular end face of the cam body 131 is divided into four equal parts, and the rotating cam portion 133 and the ejector cam portion 135 are respectively formed by opposing arcs. Therefore, the rotating cam portion 133 and the ejector cam portion 135 are arranged on the same circumference.

[0113] The rotary cam portion 133 has two first inclined surfaces 134 that are inclined circumferentially. The two first inclined surfaces 134 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 130. The rotary cam portion 133 constitutes a first cam portion. The ejector cam portion 135 has two second inclined surfaces 136 that are inclined circumferentially in the direction opposite to the first inclined surfaces 134. The two second inclined surfaces 136 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 130. The ejector cam portion 135 constitutes a second cam portion. In the extension cam 130, the first inclined surfaces 134 and the second inclined surfaces 136 are arranged on the same circumference and are continuously connected. In the writing instrument 100, the pitch of the second inclined surface 136 is twice the pitch of the first inclined surface 134.

[0114] Figure 16 yes Figure 11 A perspective view of the press cam 140 of the writing instrument 100. Two first protrusions 141, extending rearward from the front end, are provided at equal intervals along the circumferential direction on the outer peripheral surface of the press cam 140. A push-out cam support 142 is formed on the rear end face of the two first protrusions 141. The push-out cam support 142 has a third inclined surface 143 that is inclined circumferentially. The third inclined surface 143 is inclined in the same direction and at the same angle as the second inclined surface 136 of the extension cam 130, and is configured to cooperate with the second inclined surface 136. A series of cam surfaces 145, consisting of multiple peaks and multiple valleys, are formed on the front end face of the press cam 140. The push-out cam support 142 constitutes the second cam support.

[0115] Figure 17 yes Figure 11A perspective view of the rotating body 150 of the writing instrument 100. A small-diameter portion 151 is formed at the rear end of the rotating body 150, which is inserted into the snap cam 140 for centering. A protruding inner cam 153 is formed in front of the small-diameter portion 151 by dividing it with a large-diameter portion 152. The inner cam 153 has four inner cam protrusions 154 extending along the axial direction. The four inner cam protrusions 154 are arranged at equal intervals along the circumference. A cam support surface 155 is provided on the rear end face of the inner cam protrusions 154 as an inclined surface in the circumferential direction. The cam support surface 155 and the cam surface 145 of the snap cam 140 are partially inclined in the same direction and at the same angle, configured to cooperate with the cam surface 145.

[0116] Figure 18 yes Figure 11 A longitudinal sectional view of the rear end of the writing instrument 100's rear pen barrel 104. A protruding outer cam 120 is provided on the inner circumferential surface of the rear pen barrel 104. The outer cam 120 has two outer cam protrusions 123. The two outer cam protrusions 123 are arranged at equal intervals along the circumference. A rotating cam support portion 121 is formed on the rear end face of the outer cam 120. A locking cam surface 122 is formed on the front end face of the outer cam 120.

[0117] The rotary cam support 121 has a fourth inclined surface 124 that is circumferentially inclined. The fourth inclined surface 124 is inclined in the same direction and at the same angle as the first inclined surface 134 of the rotary cam portion 133 of the extended cam 130, and is configured to cooperate with the first inclined surface 134. The locking cam surface 122 has a serrated saw bevel 125 and a groove 126 extending rearward. In summary, each outer cam protrusion 123 has a fourth inclined surface 124 formed on its rear end face and two saw bevels 125 and a groove 126 between the two saw bevels 125 formed on its front end face. A guide groove 127 is formed between the two outer cam protrusions 123. The rotary cam support 121 constitutes the first cam support.

[0118] The writing instrument 100 has an extension mechanism 110, therefore, based on reference Figure 10 The above principle allows for an increase in the advance of the pen refill 6 compared to the amount of pressure generated by the press operation. Specifically, when the extension cam 130 is advanced by the press operation, the rotating cam portion 133 and the rotating cam support portion 121 cooperate to rotate the extension cam 130. Accompanying the advancement and rotation of the extension cam 130, the push-out cam portion 135 and the push-out cam support portion 142 cooperate to advance the press cam 140. As a result, the advance of the pen refill 6 is increased compared to the advance of the extension cam 130.

[0119] Figure 19 This is a longitudinal sectional view of the writing instrument 200 in its non-writing state according to the third embodiment. Figure 20 yes Figure 19 A longitudinal sectional view of the writing instrument 200 in its writing state. Additionally, Figure 21 yes Figure 19 An exploded assembly diagram of the extension mechanism 210 of the writing instrument 200. The writing instrument 200 is a push-button type writing instrument.

[0120] Compared to the writing instrument 1 of the first embodiment, the writing instrument 200 differs in the shape of the press button 208, the rear pen barrel 204, and the extension mechanism 210. Furthermore, the writing instrument 200 has an inner cylinder 209 instead of a top crown. The inner cylinder 209 is disposed inside the rear pen barrel 204, and may also include the inner cylinder 209 and be referred to as the pen barrel 202. An outer cam, similar to the outer cam 20 or outer cam 120 described above, is provided on the inner circumferential surface of the pen barrel 202, specifically on the inner circumferential surface of the inner cylinder 209; detailed description is omitted here. The extension mechanism 210 mainly includes an outer cam 220, an extension cam 230, a press cam 240, and a rotating body 250.

[0121] Figure 22 yes Figure 19 A three-dimensional view of the extension cam 230 of the writing instrument 200. Figure 23 yes Figure 19 A longitudinal sectional view of the extension cam 230 of the writing instrument 200. The extension cam 230 has a cylindrical cam body 231 and a large-diameter portion 232 with a diameter larger than that of the cam body 231. A rotating cam portion 233 is formed on the front end face of the large-diameter portion 232. The rotating cam portion 233 has two first inclined surfaces 234 that are inclined circumferentially and a flat portion 237 provided at the apex of the first inclined surfaces 234. The two first inclined surfaces 234 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 230. The rotating cam portion 233 constitutes the first cam portion.

[0122] A push-out cam portion 235 is formed in front of the cam body 231. The push-out cam portion 235 has two second inclined surfaces 236 that are inclined circumferentially in the direction opposite to the first inclined surface 234, and a flat portion 237 provided at the apex of the second inclined surface 236. The two second inclined surfaces 236 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 230. The push-out cam portion 235 constitutes a second cam portion. A rotating cam portion 233 is arranged radially outward from the push-out cam portion 235, so the rotating cam portion 233 and the push-out cam portion 235 constitute a double cam surface that is adjacent in the radial direction. The rotating cam portion 233 is arranged forward of the push-out cam portion 235. In the writing instrument 200, the pitch of the second inclined surface 236 is twice the pitch of the first inclined surface 234.

[0123] Figure 24 yes Figure 19A perspective view of the press cam 240 of the writing instrument 200. Two first protrusions 241 extending along the axial direction are provided at equal intervals along the circumferential direction on the outer peripheral surface of the press cam 240. A push-out cam support 242 is formed on the rear end face of the two first protrusions 241. The push-out cam support 242 has a third inclined surface 243 that is inclined along the circumferential direction. The third inclined surface 243 is inclined in the same direction and at the same angle as the second inclined surface 236 of the extension cam 230, and is configured to cooperate with the second inclined surface 236. Two second protrusions 244 extending along the axial direction are formed on the outer peripheral surface of the front end of the press cam 240. The two second protrusions 244 are provided at equal intervals along the circumferential direction and are positioned circumferentially corresponding to the first protrusions 241. A series of cam surfaces 245, consisting of multiple peaks and multiple valleys, are formed on the front end face of the press cam 240. The front end face of the second protrusion 244 forms part of the cam surface 245. The extended cam support 242 forms the second cam support.

[0124] Figure 25 yes Figure 19 A perspective view of the rotating body 250 of the writing instrument 200. A small-diameter portion 251 is formed at the rear end of the rotating body 250, which is inserted into the snap cam 240 for centering. A protruding inner cam 253 is formed in front of the small-diameter portion 251 by dividing it with a large-diameter portion 252. The inner cam 253 has four inner cam protrusions 254 extending along the axial direction. The four inner cam protrusions 254 are arranged at equal intervals along the circumference. A cam support surface 255 is provided on the rear end face of the inner cam protrusions 254 as an inclined surface in the circumferential direction. The cam support surface 255 and the cam surface 245 of the snap cam 240 are partially inclined in the same direction and at the same angle, configured to cooperate with the cam surface 245.

[0125] In writing instruments 200, such as Figure 22 and Figure 23 As shown, a rotary support portion 238 with a hemispherical top is provided at the rear end of the cam body 231. In the above-described embodiment, such as the first embodiment, the front end face of the annular push button 8 and the rear end face of the extended cam 30 abut against each other throughout the entire circumference. When the push button 8 is pressed, the extended cam 30 rotates around its central axis as described above, being pressed forward by the push button 8 and forced backward by the spring 7. At this time, the annular rear end face of the extended cam 30 slides against the annular front end face of the push button 8, generating resistance.

[0126] On the other hand, in this embodiment, when the press button 208 is pressed, the extension cam 230 rotates around its central axis while being pressed by the press button 208. At this time, the extension cam 230 rotates relative to the inner surface of the rear end face of the press button 208, with the apex of its hemispherical rotational support portion 238 as the fulcrum. In short, when the extension cam 230 rotates, the press button 208 and the extension cam 230 only contact at the apex of the hemispherical rotational support portion 238, and the contact is point-like. Therefore, the extension cam 230 according to this embodiment reduces rotational resistance compared to the extension cam of the embodiment described above.

[0127] As long as the resistance is reduced, even if the contact area is reduced, the shape of the part of the rotary support 238 that comes into contact with other components during rotation can be arbitrarily configured. For example, it can be non-hemispherical and instead be conical.

[0128] The writing instrument 200 has an extension mechanism 210, therefore, based on reference Figure 10 The above principle allows for an increase in the advance of the pen refill 6 compared to the amount of pressure generated by the press operation. Specifically, when the extension cam 230 is advanced by the press operation, the rotating cam portion 233 and the rotating cam support portion 221 cooperate to rotate the extension cam 230. As the extension cam 230 advances and rotates, the push-out cam portion 235 and the push-out cam support portion 242 cooperate to advance the press cam 240. As a result, the advance of the pen refill 6 is increased compared to the advance of the extension cam 230.

[0129] Figure 26 This is a perspective view of the extension cam 330 of the writing instrument according to the fourth embodiment. Compared with the writing instrument 200 of the third embodiment, the writing instrument of the fourth embodiment differs only in the shape of the extension cam 330. Specifically, compared with the extension cam 230 of the writing instrument 200, the extension cam 330 differs in the shapes of the rotating cam portion 333 and the rotating support portion 338. Therefore, descriptions of other structures of the writing instrument are omitted.

[0130] The extended cam 330 has a cylindrical cam body 331 and a large-diameter portion 332 with a diameter larger than that of the cam body 331. A rotating cam portion 333 is formed on the front end face of the large-diameter portion 332. The rotating cam portion 333 has two convex surfaces 334 that are curved circumferentially. The two convex surfaces 334 are symmetrically arranged with respect to the central axis of the extended cam 330. The rotating cam portion 333 constitutes the first cam portion.

[0131] A push-out cam portion 335 is formed in front of the cam body 331. The push-out cam portion 335 has two second inclined surfaces 336 that are inclined circumferentially and a flat portion 337 provided at the apex of the second inclined surfaces 336. The two second inclined surfaces 336 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 330. The push-out cam portion 335 constitutes a second cam portion. A rotary cam portion 333 is arranged radially outward from the push-out cam portion 335. Therefore, the rotary cam portion 333 and the push-out cam portion 335 constitute a double cam surface that is adjacent in the radial direction. The rotary cam portion 333 is arranged in front of the push-out cam portion 335.

[0132] In the extended cam of the above-described embodiment, the rotary cam portion cooperating with the rotary cam support portion has a first inclined surface that is circumferentially inclined; however, in this embodiment, the rotary cam portion 333 has a convex curved surface 334 instead of the inclined surface. (See reference...) Figure 10 As explained, the rotating cam portion is configured to slide in cooperation with the rotating cam support portion. The convex surface 334, like the inclined surface, can slide relative to the fourth inclined surface of the rotating cam support portion. That is, when the extension cam 330 is advanced by a pressing operation, the rotating cam portion 333 cooperates with the rotating cam support portion 221 to rotate the extension cam 330. Accompanying the advancement and rotation of the extension cam 330, the push-out cam portion 335 cooperates with the push-out cam support portion 242 to advance the press cam 240. As a result, the advance amount of the pen refill 6 can be increased compared to the advance amount of the extension cam 330.

[0133] The rotary support portion 338 of the extended cam 330 is formed in a cylindrical shape. Therefore, the extended cam 330 rotates while the circular rear end face of the rotary support portion 338 abuts against the inner surface of the rear end face of the push button 208.

[0134] Figure 27 (A) and Figure 27 (B) are the front view and side view of the writing instrument 400 in the non-writing state according to the fifth embodiment. Figure 28 (A) is along Figure 27 The 400-section view of the BB line writing tool of (B). Figure 28 (B) is along Figure 27 A sectional view of the AA line writing tool 400 in (A). Additionally, Figure 29 Is with Figure 28 (B) is a longitudinal sectional view of the writing instrument 400 in its writing state. Furthermore, Figure 30 (A) is along Figure 28 (B) CC line writing tool 400 section view, Figure 30 (B) is along Figure 28(B) DD line writing tool 400 section view, Figure 30 (C) is along Figure 28 (B) EE line writing tool 400 sectional view. Figure 31 yes Figure 27 A perspective view of the extension mechanism 410 of the writing instrument 400. The writing instrument 400 is a multi-core writing instrument that is a push-button type.

[0135] The writing instrument 400 includes: a pen barrel 402; a first pen core 403 serving as a first writing element and a second pen core 404a, 404b serving as a second writing element disposed within the pen barrel 402; a first pressing member 405 disposed at the rear end of the first pen core 403 in a manner that protrudes rearward from the pen barrel 402; second pressing members 460a, 460b disposed at the rear end of the second pen cores 404a, 404b in a manner that protrudes radially outward from the pen barrel 402; and a pen clip 490.

[0136] The pen barrel 402 has a front pen barrel 407, a rear pen barrel 480 disposed behind the front pen barrel 407, and an inner cylinder 470 fixed to the rear pen barrel 480. The front pen barrel 407 and the rear pen barrel 480 are connected by press-fitting, bonding, or threaded connection. For example, the front pen barrel 407 and the rear pen barrel 480 are connected by an internal thread formed on the inner circumferential surface of the front side of the rear pen barrel 480 and an external thread formed on the outer circumferential surface of the rear side of the front pen barrel 407. The pen clip 490 has a leaf spring 491 and a pen clip body 496.

[0137] In this embodiment, the first pen refill 403 is a single ballpoint pen refill, and the second pen refills 404a and 404b are two ballpoint pen refills. The first pen refill 403 and the second pen refills 404a and 404b are arranged at predetermined intervals along the inner circumferential surface of the pen barrel 402. In this embodiment, the circumferential spacing between adjacent pen refills is approximately equal.

[0138] The first actuating member 405 is configured to selectively cause the first pen refill 403 to protrude from the front end of the pen barrel 402. The second actuating members 460a and 460b, as a second actuating mechanism, have second pen refills 404a and 404b, and are configured to selectively cause the second pen refills 404a and 404b to protrude from the front end of the pen barrel 402. Specifically, when the first actuating member 405 is pressed, the first pen refill 403 protrudes; when the second actuating members 460a and 460b are pressed, the second pen refills 404a and 404b protrude. The tips of the first pen refill 403 and the second pen refills 404a and 404b move radially inward along the inner circumference of the pen barrel 402, while protruding from the front end of the pen barrel 402. Thus, it is possible to selectively use one of the three pen refills for writing.

[0139] The protrusion of the first lead 403 is released by pressing the first actuating member 405 or the second actuating members 460a and 460b. The protrusion of the second leads 404a and 404b is released by pressing the first actuating member 405 or the second actuating members 460a and 460b of the non-protruding second leads 404a and 404b. Therefore, the protrusion of the first lead 403 and the second leads 404a and 404b can be released by pressing any one of the actuating members, thus greatly improving the operability of the writing instrument 400. Furthermore, in this specification, the release of the lead protrusion means that the tip of the lead, which protrudes from the front end of the pen barrel 402, is inserted into the pen barrel 402.

[0140] The first pen refill 403 has a first ink reservoir 409 and a first pen tip 411 as the writing part. The second pen refills 404a and 404b have a second ink reservoir 412 and a second pen tip 414 as the writing part. The first pen tip 411 is connected to the first ink reservoir 409. The second pen tip 414 is connected to the second ink reservoir 412.

[0141] Typically, the first ink reservoir 409 and the two second ink reservoirs 412 each contain ink of different colors. By positioning the first actuating member 405 further rearward than the second actuating members 460a and 460b, the length of the first ink reservoir 409 can be longer than the length of the second ink reservoirs 412. As a result, the ink filling amount of the first ink reservoir 409 can be greater than that of the second ink reservoirs 412. Therefore, for example, by storing black ink, which is generally used more frequently, in the first ink reservoir 409, the lifespan of the writing instrument 400 can be extended or the frequency of refill replacement can be reduced. Furthermore, to achieve the same effect, the radial length of the first ink reservoir 409 can be longer than the radial length of the second ink reservoirs 412, so that the ink filling amount of the first ink reservoir 409 is greater than that of the second ink reservoirs 412.

[0142] The first actuating member 405, serving as the first actuating mechanism, includes a first pen tip 403, a press button 408, and an extension mechanism 410. It may also include the press button 408 and be referred to as the extension mechanism 410. The extension mechanism 410 is an actuating mechanism that moves the first pen tip 403 within the pen barrel 402 in a forward-backward direction by pressing the press button 408 forward. The extension mechanism 410 has an inner cylinder 470 with an outer cam 420, a cylindrical extension cam 430, a press cam 440, and a rotating body 450. The press button 408, extension cam 430, press cam 440, and rotating body 450 are sequentially arranged from the rear end side within the pen barrel 402. Two limiting protrusions 408a, extending axially, are provided at equal intervals along the circumferential direction on the outer peripheral surface of the front end of the press button 408.

[0143] A spring 416 is disposed between the push button 408 and the extension cam 430, and the push button 408 is pushed backward by the spring 416. The extension cam 430, the push cam 440, and the rotating body 450 are configured to move along the axial direction within the inner cylinder 470. Details will be described later, but by pressing the rotating body 450 via the push cam 440 to rotate it, the first pen tip 403 can be protruded and inserted relative to the front end of the pen barrel 402.

[0144] Figure 32 (A) to Figure 32 (D) are the front view, side view, and along the pen barrel 480, respectively. Figure 32 (B) GG line rear pen barrel 480 cross view and along Figure 32 A cross-sectional view of the rear pen barrel 480 of line (A). Two sliding holes 481 are formed on the outer peripheral surface of the rear pen barrel 480 to allow the second actuating members 460a and 460b to slide along the axial direction. The sliding holes 481 extend along the axial direction. A first protrusion 482 and a second protrusion 485 are formed on the inner peripheral surface of the rear pen barrel 480. Figure 30 (A) and Figure 30 (B) and Figure 32 (C) and Figure 32 As shown in (D), the first protrusion 482 and the second protrusion 485 protrude radially inward and extend along the axial direction. A pair of first sliding portions 486 extending along the axial direction are provided on the circumferential sides of the first protrusion 482. A first stepped portion 487 is provided at the front end of the first sliding portion 486. A through hole 483 is formed at the rear end of the rear pen barrel 480 for the push-pull cam 440 (described later) to protrude from the rear pen barrel 480. Additionally, a locking portion 488 is provided at the rear end of the rear pen barrel 480. A press-in hole 489 extending along the length direction is provided at the rear end of the rear pen barrel 480 for inserting the leaf spring 491 of the pen clip 490.

[0145] Figure 33 (A) to Figure 33 (C) shows a perspective view, a longitudinal sectional view, and a top view of the inner cylinder 470. The inner cylinder 470 has a storage portion 471 for housing the first actuating member 405 and two partition walls 472 that cooperate with the inner circumferential surface of the rear pen barrel 480 to form a storage portion for housing the second actuating members 460a and 460b. The storage portion 471 and the partition walls 472 extend in the front-rear direction, respectively. A second sliding portion 473 is provided on the side of the partition wall 472 adjacent to the disposed second actuating members 460a and 460b. A second step portion 474 is provided at the front end of the second sliding portion 473.

[0146] A through hole 475 extending in the front-rear direction is formed in the receiving part 471. Two guide grooves 477 extending rearward from the front end, two limiting grooves 478 extending forward from the rear end, and two outer cam protrusions 423 are formed on the inner surface of the through hole 475. The guide grooves 477 receive the second protrusion 444 of the click cam 440 (described later). Furthermore, the guide grooves 477 receive the inner cam protrusion 454 of the rotating body 450 (described later) when the first pen refill 403 is inserted. The limiting grooves 478 receive... Figure 31 The two limiting protrusions 408a shown are located on the outer peripheral surface in front of the push button 408. The inner cylinder 470 may also be integrated with the rear pen barrel 480.

[0147] A rotary cam support portion 421 is formed on the rear end face of the outer cam protrusion 423. The rotary cam support portion 421 has two fourth inclined surfaces 424 that are circumferentially inclined. A locking cam surface 422 is formed on the front end face of the inner cylinder 470. The rotary cam support portion 421 and the locking cam surface 422 can also be collectively referred to as the outer cam 420. A locking claw 476 is formed at the rear end of the inner cylinder 470. The inner cylinder 470 is inserted into the rear pen barrel 480 and is fixed by the locking claw 476 engaging with the locking portion 488 of the rear pen barrel 480. The rotary cam support portion 421 constitutes the first cam support portion.

[0148] Reference Figure 30 In (A), with the inner cylinder 470 fixed relative to the rear pen barrel 480, the partition walls 472 of the inner cylinder 470 abut against the corresponding second protrusions 485 of the rear pen barrel 480. The second actuating members 460a and 460b are housed in the space formed by the rear pen barrel 480 and the inner cylinder 470, and slide back and forth along the corresponding first sliding portion 486 and second sliding portion 473. When the second pen refills 404a and 404b protrude from the pen barrel 402, the first step portion 487 and the second step portion 474 engage with the rear ends of the second actuating members 460a and 460b, maintaining the writing state. In other words, the corresponding first sliding portion 486 and second sliding portion 473, as well as the first step portion 487 and second step portion 474, are set to the same or corresponding shape so that the second actuating members 460a and 460b can slide back and forth and engage.

[0149] Figure 34 (A) and Figure 34 (B) are respectively Figure 27The figures show a perspective view and a bottom view of the extension cam 430 of the writing instrument 400. The extension cam 430 has a cylindrical cam body 431. At the front end of the cam body 431, a rotating cam portion 433 is formed on the outer portion that divides the radial thickness, i.e., the wall thickness, into equal parts. The rotating cam portion 433 has two first inclined surfaces 434 that are inclined circumferentially. The two first inclined surfaces 434 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 430. The rotating cam portion 433 constitutes the first cam portion.

[0150] At the front end of the cam body 431, an ejector cam portion 435 is formed on the inner side, which divides the radial thickness equally. The ejector cam portion 435 has two second inclined surfaces 436 that are inclined circumferentially in the direction opposite to the first inclined surface 434. The two second inclined surfaces 436 are inclined in the same direction and are symmetrically arranged with respect to the central axis of the extension cam 430. The ejector cam portion 435 constitutes the second cam portion. In the writing instrument 400, the pitch of the second inclined surface 436 is the same as the pitch of the first inclined surface 434.

[0151] Figure 35 (A) and Figure 35 (B) are respectively Figure 27 A perspective view and a longitudinal sectional view of the press cam 440 of the writing instrument 400. The press cam 440 has a generally cylindrical shape. Two first protrusions 441 extending along the axial direction are provided at equal intervals along the circumferential direction on the outer peripheral surface of the front side of the press cam 440. A push-out cam support 442 is formed on the rear end face of the two first protrusions 441. The push-out cam support 442 has a third inclined surface 443 that is inclined along the circumferential direction. The third inclined surface 443 is inclined in the same direction as the second inclined surface 436 of the extension cam 430 and is configured to cooperate with the second inclined surface 436. Three second protrusions 444 extending along the axial direction are formed in front of the first protrusions 441. The three second protrusions 444 are provided at equal intervals along the circumferential direction. A cam surface 445 composed of multiple peaks and multiple valleys is formed on the front end face of the press cam 440. The cam support part 442 is extended to form the second cam support part.

[0152] The second protrusion 444 is configured to slide along the axial direction within the guide groove 477 of the inner cylinder 470 when the push cam 440 moves along the axial direction. That is, the push cam 440 and the inner cylinder 470 are configured to restrict the circumferential rotation of the push cam 440. A storage space 446 is formed inside the push cam 440 for accommodating the small-diameter portion 451 of the rotating body 450, which will be described later.

[0153] Figure 36 yes Figure 27A perspective view of the rotating body 450 of the writing instrument 400. A small-diameter portion 451 is formed at the rear end of the rotating body 450, which is inserted into the snap cam 440 for centering. A protruding inner cam 453 is formed in the large-diameter portion 452 in front of the small-diameter portion 451. The inner cam 453 has three inner cam protrusions 454 extending along the axial direction. The three inner cam protrusions 454 are arranged at equal intervals along the circumference. A cam support surface 455 is provided on the rear end face of the inner cam protrusions 454 as an inclined surface in the circumferential direction. The cam support surface 455 and the cam surface 445 of the snap cam 440 are partially inclined in the same direction and at the same angle, configured to cooperate with the cam surface 445.

[0154] The portion of the cam support surface 455 with the inner cam protrusion 454 cooperates with the cam surface 466 of the second snap-action members 460a and 460b, which will be described later. An insertion portion 456 is provided at the front end of the rotating body 450. The rear end of the first ink receiving tube 409 is pressed into the insertion portion 456. Thus, the first ink receiving tube 409 is fixed to the rotating body 450.

[0155] The cam support surface 455 is configured to receive forces in both the axial and circumferential directions from the cam surface 445 when the push cam 440 advances. Therefore, as the push cam 440 advances and the cam surface 445 presses against the cam support surface 455, the rotating body 450 rotates circumferentially using the circumferential force. On the other hand, the push cam 440 is restricted from circumferential rotation because the second protrusion 444 is housed in the guide groove 477 of the inner cylinder 470.

[0156] When the inner cam protrusion 454 is housed in the guide groove 477 of the inner cylinder 470, if the rotating body 450 rotates in the circumferential direction by the forward movement of the push cam 440, one of the three inner cam protrusions 454 engages with the locking cam surface 422 of the inner cylinder 470 in the axial direction. Furthermore, when the inner cam protrusion 454 is engaged with the locking cam surface 422 in the axial direction, if the rotating body 450 rotates in the circumferential direction by the forward movement of the push cam 440, the engagement with the locking cam surface 422 is released, and then the locking cam surface 422 is further subjected to a circumferential force and housed in the guide groove 477. In other words, the inner cylinder 470 and the rotating body 450 are configured such that when the rotating body 450 rotates in the circumferential direction by the forward movement of the push cam 440, they are either engaged with each other in the axial direction or the engagement is released.

[0157] Figure 37 (A) to Figure 37(C) are a perspective view, a side view, and a bottom view of a second actuating member 460a, respectively. Furthermore, the second actuating member 460b is formed as a mirror image of the second actuating member 460a. The second actuating member 460a has an elongated shape. The second actuating member 460a has a main body portion 461 extending in the front-rear direction, a fitting portion 462 formed at the front of the main body portion 461, and an operating portion 463 formed at the rear of the main body portion 461. The fitting portion 462 fits into the second ink collection tube 412. Thus, the second ink collection tube 412 is fixed to the second actuating member 460a. A force-applying surface 464 is formed on the main body portion 461 for the second spring 418, described later, to abut against. Figure 27 As shown, the operating part 463 protrudes radially outward from the pen barrel 402 in the assembled state of the writing instrument 400, so it can be operated with a finger.

[0158] A cam portion 465 is formed on one side of the main body portion 461. A cam surface 466 is formed at the front end of the cam portion 465, which cooperates with the cam support surface 455 of the rotating body 450. The cam surface 466 and the cam support surface 455 are configured such that when the second actuating member 460a advances, the cam support surface 455 receives forces in both the axial and circumferential directions from the cam surface 466. Therefore, when the cam surface 466 presses against the cam support surface 455 as the second actuating members 460a and 460b advance, the rotating body 450 rotates in the circumferential direction using the circumferential force. On the other hand, the second actuating members 460a and 460b are restricted from rotating in the circumferential direction because the operating portion 463 abuts against the side wall of the sliding hole 481 of the rear pen barrel 480.

[0159] A pressing protrusion 467 and a contact protrusion 468 are formed on the bottom surface of the main body 461. The pressing protrusion 467 is located in front of the contact protrusion 468. The pressing protrusion 467 and the contact protrusion 468 protrude radially inward toward the pen barrel 402 and extend along the axial direction when the writing instrument 400 is assembled. The contact protrusion 468 is pressed by the inner cam protrusion 454 of the rotating body 450 when the protrusion of the second actuating member 460a is released by the actuation operation of the first actuating member 405. The inner cam protrusion 454 and the contact protrusion 468 are configured to bear forces in the axial direction and radial direction respectively when in contact. Furthermore, when the protrusion of the second pen tip 404a is released by the actuating operation of the second actuating member 460b of the non-protruding second pen tip 404b, the contact protrusion 468 is pressed by the pressing protrusion 467 of the second actuating member 460b of the non-protruding second pen tip 404b. The contact protrusion 468 and the pressing protrusion 467 are configured to withstand axial and radial forces on each other when in contact.

[0160] like Figure 28As shown, the writing instrument 400 also includes a first spring 417, a second spring 418, and a spacer 419 supporting the first spring 417 and the second spring 418.

[0161] Figure 38 for Figure 27 A perspective view of the spacer 419 of the writing instrument 400. The spacer 419 has a spacer 419a and a plurality of protruding spring guides 419b extending rearward from the cylindrical portion. The spacer 419a has a cylindrical shape and three through holes are formed in the spacer 419a. The first through hole 419c and two second through holes 419d are arranged at predetermined intervals along the inner circumferential surface of the spacer 419a. In this embodiment, the circumferential spacing between adjacent through holes is approximately equal. The first ink receiving tube 409 extends through the first through hole 419c and is fixed to the rotating body 450. The second ink receiving tube 412 extends through the second through hole 419d and is fixed to the second actuating members 460a and 460b. The area of ​​the first through hole 419c is larger than the area of ​​the second through hole 419d. Therefore, the first ink receiving tube 409 can be thicker than the second ink receiving tube 412, thereby enabling the first ink receiving tube 409 to have a larger ink filling amount than the second ink receiving tube 412.

[0162] The first spring 417 is disposed between the rear surface of the spacer 419a and the front end of the rotating body 450 in a circumferential manner surrounding the first ink reservoir 409, and applies a rearward force to the rotating body 450 and the first pen refill 403. The second spring 418 is disposed between the rear surface of the spacer 419a and the force-applying surface 464 of the second snap members 460a and 460b in a circumferential manner surrounding the second ink reservoir 412, and applies a rearward force to the second snap members 460a and 460b and the second pen refills 404a and 404b.

[0163] The following explains the principle by which the first pen refill 403 and the second pen refills 404a and 404b protrude from the front end of the pen barrel 402, and the principle by which the protrusion of the first pen refill 403 and the second pen refills 404a and 404b is released by the first actuating member 405 or the second actuating member 460a and 460b.

[0164] First, let me explain the principle behind the first pen refill 403 protruding from the front end of the pen barrel 402.

[0165] In the submerged state, the inner cam protrusion 454 of the rotating body 450 is housed within the guide groove 477 of the inner cylinder 470. From this state, a press operation is performed to push the press button 408 forward against the force of the first spring 417. The forward movement of the press button 408 caused by the press operation propels the extension cam 430 forward. When the extension cam 430 moves forward, the rotating cam portion 433 of the extension cam 430 cooperates with the rotating cam support portion 421 of the outer cam 420, causing the extension cam 430 to rotate about its central axis relative to the inner cylinder 470 and subsequently the pen barrel 480. That is, based on a reference... Figure 10 Based on the above principle, the first inclined surface 434 slides along the fourth inclined surface 424, while the extension cam 430 advances and rotates simultaneously. On the other hand, accompanying the advance and rotation of the extension cam 430, the push-out cam portion 435 of the extension cam 430 cooperates with the push-out cam support portion 442 of the push-out cam 440 to advance the push-out cam 440. That is, the third inclined surface 443 slides relative to the second inclined surface 436, while the push-out cam 440 advances. Furthermore, the push-out cam 440 is positioned within the guide groove 477 of the inner cylinder 470 via the second protrusion 444, thereby restricting its rotation about the central axis. Additionally, accompanying the advance of the push-out cam 440, the rotating body 450 and the first pen refill 403 are pressed against the force of the first spring 417 and advance as a unit.

[0166] In summary, the extension cam 430 moves in the rotational direction through the cooperation of the rotating cam portion 433 of the extension cam 430 and the rotating cam support portion 421 of the outer cam 420. Due to the rotation of the extension cam 430, the push-out cam portion 435 of the extension cam 430 cooperates with the push-out cam support portion 442 of the push-out cam 440, increasing the forward movement of the push-out cam 440 compared to the forward movement of the extension cam 430.

[0167] At this time, the push cam 440 and the rotating body 450 mutually bear axial and circumferential forces via the cam surface 445 and the cam support surface 455. Then, when the rear end of the inner cam protrusion 454 passes the front end of the locking cam surface 422, the restriction on the circumferential rotation of the rotating body 450 is released, and therefore, the rotating body 450 rotates circumferentially using the circumferential force. On the other hand, the push cam 440 is restricted from circumferential rotation by being housed in the guide groove 477 by the second protrusion 444, and therefore does not rotate circumferentially.

[0168] If the button 408 is released in this state, the extension cam 430, the push cam 440, and the rotating body 450 retract by the force of the first spring 417. At this time, one of the inner cam protrusions 454 of the rotating body 450, which has rotated in the circumferential direction, engages with the locking cam surface 422 of the inner cylinder 470 in the axial direction. Due to this engagement, the retraction of the rotating body 450 is hindered, and therefore, the first pen refill 403, which is fixed to the rotating body 450, remains in a protruding state from the front end of the pen barrel 402.

[0169] The principle of how the protrusion of the first pen refill 403 is released by the first actuating member 405 will be explained below.

[0170] In the protruding state, the inner cam protrusion 454 of the rotating body 450 engages axially with the locking cam surface 422 of the inner cylinder 470. If, from this state, the force of the first spring 417 is overcome and the press button 408 and the extension cam 430 are used to advance the press cam 440, the cam surface 445 of the press cam 440 presses against the cam support surface 455 of the rotating body 450, and the rotating body 450 advances together with the press cam 440. At this time, the press cam 440 and the rotating body 450 mutually bear axial and circumferential forces through the cam surface 445 and the cam support surface 455. Then, when the rear end of the inner cam protrusion 454 passes the front end of the locking cam surface 422, the restriction on the circumferential rotation of the rotating body 450 is released, and therefore, the rotating body 450 rotates circumferentially using the circumferential force. On the other hand, the push cam 440 is restricted from rotating in the circumferential direction because the second protrusion 444 is housed in the guide groove 477 of the inner cylinder 470, and therefore does not rotate in the circumferential direction.

[0171] If the button 408 is released in this state, the extension cam 430, the push cam 440, and the rotating body 450 retract under the force of the first spring 417, and the inner cam protrusion 454, which has rotated in the circumferential direction, is housed in the guide groove 477. At this time, the first pen refill 403, which is fixed to the rotating body 450, also retracts, thus releasing the protrusion of the first pen refill 403.

[0172] The following explains the principle of releasing the protrusion of the first pen refill 403 using the second snap-action members 460a and 460b.

[0173] In the convex state, the inner cam protrusion 454 of the rotating body 450 engages with the locking cam surface 422 of the inner cylinder 470 in the axial direction. At this time, the cam portion 465 of the second snap-action members 460a and 460b is located behind the inner cam protrusion 454 of the rotating body 450, and the circumferential position of the cam portion 465 is the same as the circumferential position of one of the inner cam protrusions 454.

[0174] If the force of the second spring 418 is overcome from this state to advance the second actuating members 460a and 460b, then the cam surface 466 of the second actuating members 460a and 460b abuts against the cam support surface 455 of the rotating body 450, and the rotating body 450 advances together with the second actuating members 460a and 460b. At this time, the second actuating members 460a and 460b and the rotating body 450 mutually bear axial and circumferential forces through the cam surface 466 and the cam support surface 455. Then, when the rear end of the inner cam protrusion 454 passes the front end of the locking cam surface 422, the restriction on the circumferential rotation of the rotating body 450 is released, and therefore, the rotating body 450 rotates circumferentially using the circumferential force. On the other hand, the second actuating members 460a and 460b are restricted from rotating in the circumferential direction because the operating part 463 abuts against the side wall of the sliding hole 481 of the rear pen barrel 480, and therefore do not rotate in the circumferential direction. The inner cam protrusion 454, which has rotated in the circumferential direction, is retracted into the guide groove 477 by the force of the first spring 417. At this time, as the extension cam 430, the rotating body 450 and the actuating cam 440 retract, the first pen tip 403, which is fixed to the rotating body 450, also retracts, and the protrusion of the first pen tip 403 is released.

[0175] The following explains the principle behind the second pen refills 404a and 404b protruding from the front end of the pen barrel 402.

[0176] From the submerged state, the second snap-action members 460a and 460b advance against the force of the second spring 418. Then, when the rear ends of the second snap-action members 460a and 460b pass the second step portion 474 of the second sliding portion 473 of the inner cylinder 470, the operating portion 463 of the second snap-action members 460a and 460b falls radially inward.

[0177] If the second actuating members 460a and 460b are released in this state, the rear ends of the second actuating members 460a and 460b engage with the second step portion 474 in the axial direction under the force of the second spring 418. Due to this engagement, the retraction of the second actuating members 460a and 460b is hindered, and therefore, the second pen refills 404a and 404b fixed to the second actuating members 460a and 460b maintain their protruding state from the front end of the pen barrel 402.

[0178] The principle of releasing the protrusion of the second pen refill 404b by using the first snap member 405 will be explained below. Furthermore, the principle of releasing the protrusion of the second pen refill 404a by using the first snap member 405 is the same.

[0179] In the protruding state, the second snap member 460b engages with the inner cylinder 470 in the axial direction. At this time, the inner cam protrusion 454 of the rotating body 450 is located rearward than the contact protrusion 468 of the second snap member 460b. In addition, the inner cam protrusion 454 and the contact protrusion 468 partially overlap in the circumferential direction.

[0180] When the press cam 440 is advanced by the press button 408 and the extension cam 430 against the force of the first spring 417, the cam surface 445 of the press cam 440 abuts against the cam support surface 455 of the rotating body 450, and the rotating body 450 advances together with the press cam 440. Then, when the inner cam protrusion 454 of the rotating body 450 contacts the contact protrusion 468 of the second press member 460b, the contact protrusion 468 receives a radially outward force from the inner cam protrusion 454, thus releasing the engagement between the second press member 460b and the inner cylinder 470. Then, the second press member 460b retracts under the force of the second spring 418, thus the second pen refill 404b fixed to the second press member 460b also retracts, and the protrusion of the second pen refill 404b is released.

[0181] The principle of releasing the protrusion of the second pen refill 404b using the second snap member 460a will be explained below. Furthermore, the principle of releasing the protrusion of the second pen refill 404a using the second snap member 460b is the same.

[0182] In the protruding state, the second actuating member 460b engages with the inner cylinder 470 in the axial direction. At this time, the pressing protrusion 467 of the second actuating member 460a, which is not protruding from the second pen refill 404a, is located further rearward than the contact protrusion 468 of the second actuating member 460b. In addition, the pressing protrusion 467 of the second actuating member 460a and the contact protrusion 468 of the second actuating member 460b partially overlap in the circumferential direction.

[0183] If, from this state, the force of the second spring 418 is overcome and the second actuating member 460a of the second pen refill 404a is advanced, then the pressing protrusion 467 of the second actuating member 460a contacts the contact protrusion 468 of the second actuating member 460b. At this time, the contact protrusion 468 of the second actuating member 460b bears a radially outward force from the pressing protrusion 467 of the second actuating member 460a, thus releasing the engagement between the second actuating member 460b and the inner cylinder 470. Then, the second actuating member 460b retracts using the force of the second spring 418, thus the second pen refill 404b fixed to the second actuating member 460b also retracts, and the protrusion of the second pen refill 404b is released.

[0184] The writing instrument 400 has an extension mechanism 410, and therefore is based on a reference. Figure 10The above principle allows for an increase in the advance of the first pen refill 403 compared to the amount of press operation. Specifically, when the extension cam 430 is advanced using a press operation, the rotating cam portion 433 and the rotating cam support portion 421 cooperate to rotate the extension cam 430. As the extension cam 430 advances and rotates, the push-out cam portion 435 and the push-out cam support portion 442 cooperate to advance the press cam 440. As a result, the advance of the first pen refill 403 is increased compared to the advance of the extension cam 430.

[0185] The writing instrument 400 has two second refills 404a and 404b as second writing bodies, but it may also have one or more second refills. In summary, as a multi-refill writing instrument, it comprises: a first writing body and at least one second writing body disposed within the pen barrel; a first press mechanism comprising the first writing body and an extension mechanism, configured to selectively cause the first writing body to protrude from the front end of the pen barrel by means of the extension mechanism during a press operation; and a second press mechanism comprising the second writing body, configured to selectively cause the second writing body to protrude from the front end of the pen barrel during a press operation, wherein the extension mechanism is configured to advance the first writing body in such a way that the advance amount of the first writing body is greater than the press amount of the press operation.

[0186] According to all the embodiments described above, a more compact press mechanism that allows for press operation with less actuation can be achieved. In particular, in the aforementioned extension mechanism, the first cam portion is positioned radially outward than the second cam portion, or the first and second cam portions are positioned on the same circumference. Therefore, for example, compared to a structure where the first and second cam portions are positioned at both ends in the longitudinal direction of the extension cam, the overall length of the extension cam and thus the extension mechanism can be shortened. Consequently, the pen refill can be made longer, or the writing instrument can be made more compact. Furthermore, for example, when the press operation portion protrudes rearward from the rear end of the pen barrel, the amount of protrusion can be reduced.

[0187] In addition to the convex surface 334 of the rotating cam portion 333 of the writing instrument's extension cam 330 in the fourth embodiment, in other embodiments, the first inclined surface of the rotating cam portion of the extension cam cooperates with the fourth inclined surface of the rotating cam support portion of the outer cam, and the second inclined surface of the push-out cam portion of the extension cam cooperates with the third inclined surface of the push-out cam support portion of the press-out cam. Here, the inclined surface may be circumferentially inclined, or it may not be an inclined surface in the strict sense. Therefore, the inclined surface includes curved surfaces, i.e., convex curved surfaces and concave curved surfaces.

[0188] The first inclined surface of the rotating cam portion, which is the first cam part, and the fourth inclined surface of the rotating cam support portion, which is the first cam support portion, have inclined surfaces that are at least partially complementary to each other. The second inclined surface of the ejection cam portion, which is the second cam part, and the third inclined surface of the ejection cam support portion, which is the second cam support portion, have inclined surfaces that are at least partially complementary to each other.

[0189] The rotary cam support may have a first actuating portion that can slide along the first inclined surface of the rotary cam instead of the fourth inclined surface. Alternatively, the rotary cam may have a first actuating portion that can slide along the fourth inclined surface of the rotary cam support instead of the first inclined surface. In short, in both the rotary cam and the rotary cam support, one may have a first inclined surface that is circumferentially inclined, and the other may have a first actuating portion that can slide along the first inclined surface. Similarly, the ejector cam support may have a second actuating portion that can slide along the second inclined surface of the ejector cam instead of the third inclined surface. Alternatively, the ejector cam may have a second actuating portion that can slide along the third inclined surface of the ejector cam support instead of the second inclined surface. In short, in both the ejector cam and the ejector cam support, one may have a second inclined surface that is circumferentially inclined, and the other may have a second actuating portion that can slide along the second inclined surface.

[0190] The first and second actuating parts can also be convex surfaces like the convex surface 334 of the rotary cam 333 described above. They can be configured arbitrarily as long as they can slide along the corresponding first or second inclined surface. Alternatively, the pitch of the second inclined surface can be set to be the same as or greater than the pitch of the first inclined surface. By setting the pitch of the second inclined surface to be greater than the pitch of the first inclined surface, a click operation can be performed with less click amount. The first inclined surface and its corresponding first actuating part, as well as the second inclined surface and its corresponding second actuating part, can each be provided in twos, as in the above embodiment, or in one or more than three. When there are two or more first inclined surfaces and their corresponding first actuating parts, as well as second inclined surfaces and their corresponding second actuating parts, it is preferable that they are arranged at equal intervals along the circumference, that is, symmetrically arranged around the central axis of the writing instrument or pen barrel. Compared to the case of one, when there are two or more first inclined surfaces and corresponding first action parts, as well as second inclined surfaces and corresponding second action parts, the rotation of the extended cam is stable, and therefore preferred.

[0191] In summary, according to the above embodiments, a clickable writing instrument is provided, characterized in that the clickable writing instrument comprises: a pen barrel; an extension cam disposed within the pen barrel in a manner that allows it to move back and forth and rotate about a central axis, and having a first cam portion and a second cam portion facing forward; a first cam support portion disposed on the inner circumferential surface of the pen barrel and facing rearward; a clickable cam disposed in front of the extension cam in a manner that allows it to move back and forth within the pen barrel and having a second cam support portion facing rearward; and a writing body that moves forward with the forward movement of the clickable cam. The clickable writing instrument can switch between a writing state and a non-writing state by clicking operation. In the first cam section and the first cam support section, one has a first inclined surface that is inclined in the circumferential direction, and the other has a first action section that can slide along the first inclined surface. In the second cam section and the second cam support section, one has a second inclined surface that is inclined in the circumferential direction in the opposite direction to the first inclined surface, and the other has a second action section that can slide along the second inclined surface. The push-button writing instrument is configured such that when the extension cam is advanced by push-button operation, the first cam section and the first cam support section cooperate to rotate the extension cam. As the extension cam advances and rotates, the second cam section and the second cam support section cooperate to advance the push-button cam. The advance of the writing body is greater than the advance of the extension cam.

[0192] In the above-described embodiments, the push button located at the rear end of the writing instrument can also be configured as an erasing member for erasing the writing produced by the writing instrument. The writing core of the writing instrument described above can contain thermochromic ink. In this case, the writing instrument is a thermochromic writing instrument, and the writing on the writing instrument can be thermochromically changed by the frictional heat generated when the friction body, which serves as the erasing member, rubs against it. Furthermore, as the writing core, ballpoint pens containing thermochromic ink, mechanical pencils containing thermochromic cores, pencil holders, etc., can also be used. Alternatively, a writing instrument containing eraser-type ink that can be erased with an eraser can also be used.

[0193] Here, thermochromic ink refers to ink with the following properties: it maintains a specified color (color 1) at room temperature (e.g., 25°C), changes to another color (color 2) when heated to a specified temperature (e.g., 60°C), and then reverts to its original color (color 1) when cooled to a specified temperature (e.g., -5°C). In writing instruments using thermochromic ink, the aforementioned color 2 is set to colorless. Here, "erasure" refers to the case where the lines written with color 1 (e.g., red) are heated to become colorless. Therefore, frictional heat is generated by rubbing the writing surface with the lines using a friction element that serves as the erasing part, thereby causing the lines to become colorless, i.e., erased. Furthermore, the aforementioned color 2 can of course be a colored color other than colorless.

[0194] Figure 39 yes Figure 27 A perspective view of the pen clip 490 of the writing instrument 400. The pen clip 490 has a leaf spring 491 and a pen clip body 496.

[0195] Figure 40 It is a 3D diagram of the leaf spring 491 of the pen clip 490. Figure 41 This is a side view of the leaf spring 491 of the pen clip 490. Figure 42 This is a longitudinal sectional view of the pen clip body 496 of the pen clip 490.

[0196] Reference Figure 40 and Figure 41 The leaf spring 491 is a generally U-shaped leaf spring with an opening facing forward. The leaf spring 491 can be formed from various plate-like elastic materials, but is preferably formed from metal, particularly stainless steel. The leaf spring 491 includes a first end 492 mounted on the pen barrel 402 side, specifically mounted on the insertion hole 489 of the rear pen barrel 480, a second end 493 mounted on the pen clip body 496, and a convex curved portion 494 connecting the first end 492 and the second end 493. Serrated protrusions 492a are formed on both sides of the first end 492, and serrated protrusions 493a are formed on both sides of the second end 493.

[0197] Reference Figure 41 The bending portion 494 is constructed by bending the plate-like members constituting the leaf spring in such a way that they have approximately the same radius of curvature. The bending portion 494 is formed as an arc with a central angle of 180 degrees or more. On the other hand, the first end portion 492 and the second end portion 493 extend in the same direction and are approximately parallel. The extension line of the second end portion 493 is approximately the same as the tangent at the connection portion where it connects to the bending portion 494. On the other hand, the portion of the bending portion 494 that connects to the first end portion 492 has an inflection point due to its relationship with the outwardly protruding portion of the convex bending portion 494. In other words, the bending portion 494, which is formed as an arc with a central angle of 180 degrees or more, has an inwardly protruding concave inflection point portion 495 on the side of the first end portion 492. A convex approach point 494a is provided at a position 180 degrees from the point of tangency between the extension line of the second end portion 493 and the bending portion 494, that is, on the side opposite to the point of tangency. The approach point 494a of the bend 494 is the point furthest from the extension of the outer surface of the first end 492, separated by a distance L.

[0198] Reference Figure 42When the pen clip 490 is mounted on the writing instrument 400, a convex ball portion 496a is formed at the front end of the pen clip body 496, which serves to prevent the pen clip 490 from slipping off when holding an item. A mounting hole 497 extending along the length direction is formed in the pen clip body 496 for inserting a leaf spring 491. A receiving hole 496b is formed at the front end of the mounting hole 497 in the pen clip body 496. A fitting protrusion 496c is formed on the inner surface of the receiving hole 496b. Furthermore, a similar fitting protrusion (not shown) is also formed on the inner surface of the press-in hole 489 of the rear pen barrel 480. A wall-shaped abutment portion 498, formed by the mounting hole 497, is provided at the rear end of the pen clip body 496. The abutment portion 498 is configured to be positioned opposite the pen barrel 402 when the pen clip 490 is mounted on the writing instrument 400.

[0199] The pen clip 490 is assembled by inserting the leaf spring 491 into the mounting hole 497 of the pen clip body 496. Specifically, the second end 493 of the leaf spring 491 is inserted into the receiving hole 496b of the pen clip body 496. At this time, the gentle slope of the serrated protrusions 493a on both sides of the second end 493 abuts against the fitting protrusions 496c, and the serrated protrusions 493a move past the fitting protrusions 496c within the receiving hole 496b. Therefore, there is less resistance in the direction in which the leaf spring 491 is inserted into the pen clip body 496. On the other hand, relative to the direction in which the leaf spring 491 is pulled out of the pen clip body 496, the steeper slope of the serrated protrusions 493a abuts against the fitting protrusions 496c, and the serrated protrusions 493a are firmly locked into the fitting protrusions 496c. Therefore, there is a large resistance in the direction of pulling out the leaf spring 491, which means that the leaf spring 491 can only be removed by destroying the pen clip body 496.

[0200] The first end 492 of the leaf spring 491 is inserted into the insertion hole 489 of the rear pen barrel 480. At this time, the gentle slope of the serrated protrusions 492a on both sides of the first end 492 abuts against the fitting protrusion, and the serrated protrusions 492a move past the fitting protrusion within the insertion hole 489. Therefore, there is less resistance in the direction of inserting the leaf spring 491 into the rear pen barrel 480. On the other hand, relative to the direction of pulling the leaf spring 491 out of the rear pen barrel 480, the steeper slope of the serrated protrusions 492a abuts against the fitting protrusion, and the serrated protrusions 492a are firmly locked with the fitting protrusion. Therefore, there is greater resistance in the direction of pulling the leaf spring 491 out, which is configured such that the leaf spring 491 can only be removed by breaking the rear pen barrel 480. In summary, the serrated protrusion 492a of the first end 492 and the fitting protrusion of the press-in hole 489, the serrated protrusion 493a of the second end 493 and the fitting protrusion 496c of the receiving hole 496b are configured to allow travel in the insertion direction but not in the extraction direction.

[0201] Figure 43 (A) represents the pen clip 490 closed, i.e., the state where no item is held. Figure 27 A longitudinal section view of the rear of the writing instrument 400. Figure 43 (B) indicates the pen clip 490 is in the open state. Figure 27 A longitudinal sectional view of the rear of the writing instrument 400. (Refer to...) Figure 43 (A) The pen clip 490 is mounted on the pen barrel 402. Specifically, as described above, the first end 492 of the leaf spring 491 is inserted into the press-in hole 489 of the rear pen barrel 480. In this state, the point of the leaf spring 491 closest to the central axis of the pen barrel 402 is the approach point 494a of the aforementioned curved portion 494. The approach point 494a is the point furthest from the extension line of the first end 492; in other words, it is the point furthest from the extension line of the press-in hole 489 of the rear pen barrel 480.

[0202] Reference Figure 43 (B) When the front end of the pen clip 490 is lifted to hold an item, it rotates around the inflection point 495 or near the inflection point 495. In other words, the leaf spring 491 or the pen clip body 496 is configured to open the pen clip 490 around the inflection point 495 or near the inflection point 495. Moreover, the leaf spring 491 or the rear pen lever 480 is configured to prevent the pen clip 490 from opening beyond a predetermined degree. That is, if the pen clip 490 is to be opened beyond a predetermined degree, as shown by reference numeral P in the attached figure, the abutment portion 498 of the pen clip body 496 abuts against the side of the pen lever 402, i.e., the rear pen lever 480, thus restricting the rotation of the pen clip 490. This prevents damage or plastic deformation of the leaf spring 491, as well as damage to the press-in hole 489 of the rear pen barrel 480 caused by the first end 492 of the leaf spring 491, or damage to the receiving hole 496b of the pen clip body 496 caused by the second end 493 of the leaf spring 491.

[0203] like Figure 43 As shown in (A), the pen clip 490 has a concave inflection point 495 in its curved portion 494, allowing the pen clip 490 to be positioned closer to the central axis of the pen barrel 402 at a distance L from a diameter with a radius of curvature comparable to that of the curved portion 494. Therefore, the pen clip 490 can be mounted closer to the pen barrel 402 in a manner that minimizes the mounting height. The pen clip 490 has a leaf spring 491 with a larger radius of curvature, resulting in a wider elastic range. In other words, based on the pen clip 490, it is possible to provide a pen clip 490 for a writing instrument that ensures a wider elastic range and a more compact design, and a writing instrument 400 equipped with the pen clip 490, which has a leaf spring 491.

[0204] In particular, the writing instrument 400 is a multi-core writing instrument, therefore, the outer diameter of the pen barrel is larger than that of a writing instrument with only one lead. According to the aforementioned clip 490, the multi-core writing instrument 400 with the clip 490 can be made more compact overall. Furthermore, the first actuating member 405, which is disposed at the rear end of the first lead 403 protruding rearward from the pen barrel 402, is disposed off-center relative to the central axis of the pen barrel 402. Specifically, the first actuating member 405 is disposed off-center relative to the central axis of the pen barrel 402, away from the clip 490. Thus, the movement of the contact portion 498 and the contact space when the clip 490 is opened can be ensured at the rear end of the pen barrel 402 without being obstructed by the first actuating member 405.

[0205] The shape of the curved portion 494 may not be formed with the same radius of curvature, and may be formed by combining straight lines and / or curves including multiple radii of curvature. Furthermore, the curve of the curved portion 494 also includes a shape formed by bending the plate-like elastic member. The inflection point portion 495 includes not only the mathematical inflection point, but also the entire shape of the inwardly protruding concave portion in the roughly U-shaped leaf spring 491. Therefore, the inflection point portion 495 includes not only a curve, but also a shape formed by bending the plate-like elastic material.

[0206] In addition, especially as Figure 31 As shown, the rear end portion 408b of the press button 408, which is a closed end, has a hemispherical shape. The surface of the rear end portion 408b is formed in a pear-skin pattern. Specifically, the surface roughness Sa is preferably in the range of 8 to 25 μm. This prevents the finger from slipping when the press button 408 is pressed, allowing for reliable pressing. If the surface roughness Sa is less than the above range, the finger will slip during pressing. On the other hand, if the surface roughness Sa is greater than the above range, the finger will excessively hook during pressing. Therefore, the surface roughness Sa is preferably within the above range. Furthermore, the surface roughness Sa is set as a measurement value obtained non-contactly (using a photodetector) based on ISO 25178.

[0207] Refer again Figure 36The insertion portion 456, located at the front end of the rotating body 450, has a rectangular cross-section, particularly a rectangular cross-section. Larger protrusions 456a are provided on the wider side of the longer side of the rectangular cross-section of the insertion portion 456. Smaller protrusions 456b are provided on the narrower side of the shorter side of the rectangular cross-section of the insertion portion 456. In the cross-section of the insertion portion 456, the two large protrusions 456a, the two small protrusions 456b, and the four rounded vertices of the rectangle are arranged to be tangent to a circle centered on the central axis of the rotating body 450. That is, this circle is the inscribed circle relative to the two large protrusions 456a, the two small protrusions 456b, and the four vertices.

[0208] The inner diameter of the first ink reservoir 409 of the first pen refill 403, which is connected to the insertion portion 456 of the rotating body 450, is slightly smaller than the inscribed circle. Therefore, by pressing the first ink reservoir 409 relative to the insertion portion 456, the first pen refill 403 is fitted with the rotating body 450. Specifically, the fitting of the first pen refill 403 with the rotating body 450 is achieved by using two large protrusions 456a and two small protrusions 456b arranged circumferentially at equal intervals, angularly every 90 degrees, to support the inner surface of the first ink reservoir 409. As a result, the variation in fitting force corresponding to the position and posture (writing state or non-writing state) of the first pen refill 403 is reduced. That is, a stable fit can always be established between the first pen refill 403 and the rotating body 450.

[0209] Furthermore, the cross-sectional shape of the insertion portion 456, the shape of the large protrusion 456a, and the shape of the small protrusion 456b can be arbitrarily configured as long as the first ink reservoir 409 is pressed into the insertion portion 456, thereby fitting the first pen refill 403 with the rotating body 450. For example, the cross-sectional shape of the insertion portion 456 can be set to hexagonal, and the three large protrusions and three small protrusions can be alternately arranged on each side.

[0210] Figure 44 This is a perspective view of the crown 415. The crown 415 is fitted into the rear end of the rear pen barrel 480. As described above, the pen barrel 402 may also include the crown 415. The crown 415 is fitted into the rear end of the rear pen barrel 480 by two forward-extending locking claws 415a. An insertion hole 415b is formed in the crown 415 for the push button 408 to pass through. The insertion hole 415b is eccentrically positioned relative to the central axis of the crown 415, i.e., the central axis of the pen barrel 402, so that the first push member 405 can be inserted. A fixing protrusion 415c is formed on the inner wall surface of the insertion hole 415b. The fixing protrusion 415c is positioned towards the central axis in the inner wall surface of the insertion hole 415b, but it may also be positioned in other parts.

[0211] On the crown 415, a generally rectangular notch 415d is formed on the side opposite to the insertion hole 415b relative to the central axis. The notch 415d is configured to receive the pen clip 490, specifically the pen clip body 496, when the writing instrument 400 is assembled. (See reference...) Figure 43 (B) The limitation on the rotation of the pen clip 490 described above can be the inner wall of the notch 415d, which is the part of the pen barrel 402 that abuts against the pen clip body 496 as indicated by reference numeral P.

[0212] In the writing instrument 400, the axial configuration of the push button 408 differs between the writing and non-writing states. Specifically, it is difficult to determine from the accompanying drawings, but in the writing instrument 400, Figure 28 The push button 408 shown in non-writing state and Figure 29 The push button 408 in the writing state varies in size by 0.2 to 1.0 mm along its axial direction. That is, the push button 408 in the writing state is fixed and positioned along its axial direction at the forward limit of the push operation and the backward limit of the spring 416. Figure 27 or Figure 28 Fixed positions between ) Figure 29 The push button 408 is fixed in a fixed position by engaging the push button 408 with the fixing protrusion 415c of the insertion hole 415b.

[0213] The engagement between the push button 408 and the retaining protrusion 415c is, for example, the pressing of the push button 408 into the insertion hole 415b of the crown 415. The pressing dimension between the outer diameter of the push button 408 and the inner diameter of the insertion hole 415b of the retaining protrusion 415c is, for example, 0.01 to 0.05 mm. The fixed position, which has advanced 0.2 to 1.0 mm from the retraction limit, is determined by balancing the rearward force applied to the push button 408 by the spring 416 and the frictional force generated by the pressing to fix it. In other words, the spring constant of the spring 416 and the pressing dimension between the push button 408 and the insertion hole 415b of the crown 415 are determined in a manner that defines the fixed position. The retaining protrusion 415c can be of any shape as long as it allows the push button 408 to be pressed into the insertion hole 415b.

[0214] In writing mode, since the push button 408 is fixed in a position between its forward and backward limits along the axial direction, it is possible to determine whether the writing instrument 400 is in a writing or non-writing state. Furthermore, the push button 408 is restricted from movement, particularly in the lateral direction orthogonal to the central axis, by the top crown 415, thus preventing wobbling of the push button 408 during writing. Alternatively, the top crown 415 can be integrally formed with the rear pen barrel 480.

[0215] According to the above embodiments, the following [1-1] to [1-7] can be provided.

[0216] [1-1]

[0217] A push-button writing instrument, characterized in that,

[0218] This push-button writing instrument has the following features:

[0219] pen;

[0220] An extension cam is disposed within the pen barrel in a manner that allows it to move back and forth and rotate about a central axis, and has a first cam portion and a second cam portion facing forward;

[0221] The first cam support is located on the inner circumferential surface of the pen barrel and faces rearward;

[0222] A push-button cam, which is positioned in front of the extended cam in a manner that allows it to move back and forth within the pen barrel, and has a rearward-facing second cam support; and

[0223] The writing surface advances along with the forward movement of the click cam.

[0224] This click-type writing instrument allows users to switch between writing and non-writing modes using a click operation.

[0225] In the first cam portion and the first cam support portion, one has a first inclined surface that is circumferentially inclined, and the other has a first actuating portion that can slide along the first inclined surface.

[0226] In the second cam portion and the second cam support portion, one has a second inclined surface that is inclined circumferentially in the direction opposite to the first inclined surface, and the other has a second actuating portion that can slide along the second inclined surface.

[0227] The push-button writing instrument is configured such that when the extension cam is advanced by a push-button operation, the first cam portion and the first cam support portion cooperate to rotate the extension cam. As the extension cam advances and rotates, the second cam portion and the second cam support portion cooperate to advance the push-button cam. The advance amount of the first writing element is greater than the advance amount of the extension cam.

[0228] [1-2]

[0229] According to the push-button writing instrument described in [1-1], wherein,

[0230] In the first cam portion and the first cam support portion, one has at least two first inclined surfaces arranged symmetrically about a central axis, and the other has at least two first actuating portions arranged symmetrically about a central axis in a corresponding manner.

[0231] In the second cam portion and the second cam support portion, one has at least two second inclined surfaces arranged symmetrically about a central axis, and the other has at least two second actuating portions arranged symmetrically about a central axis in a corresponding manner.

[0232] [1-3]

[0233] According to the push-button writing instrument described in [1-1] or [1-2], wherein,

[0234] The extended cam is formed in a cylindrical shape, and the first cam portion is positioned radially outward compared to the second cam portion.

[0235] [1-4]

[0236] According to the push-button writing instrument described in [1-1] or [1-2], wherein,

[0237] The extended cam is formed in a cylindrical shape, and the first cam portion and the second cam portion are arranged on the same circumference.

[0238] [1-5]

[0239] According to the push-button writing instruments described in [1-1] to [1-4], wherein,

[0240] At least one of the first and second functional parts has an inclined surface that is at least partially complementary to the corresponding first or second inclined surface.

[0241] [1-6]

[0242] According to the push-button writing instruments described in [1-1] to [1-4], wherein,

[0243] At least one of the first functional part and the second functional part has a convex curved surface.

[0244] [1-7]

[0245] According to the push-button writing instruments described in [1-1] to [1-6], wherein,

[0246] The pitch of the second inclined plane is set to be the same as or greater than the pitch of the first inclined plane.

[0247] In addition, according to the above-described embodiments, the following [2-1] to [2-9] are provided.

[0248] [2-1]

[0249] A multi-core writing instrument, characterized in that,

[0250] This multi-core writing instrument features:

[0251] pen;

[0252] A first writing element and at least one second writing element are disposed within the pen barrel;

[0253] A first press-action mechanism, comprising the first writing element and an extension mechanism, is configured to selectively extend the first writing element from the front end of the pen barrel by means of the extension mechanism via a press-action operation; and

[0254] The second click mechanism, which includes the second writing element, is configured to selectively cause the second writing element to protrude from the front end of the pen barrel by means of a click operation.

[0255] The extension mechanism is configured to advance the first writing element in such a way that the advance amount of the first writing element is greater than the press amount of the press operation.

[0256] [2-2]

[0257] According to the multi-core writing instrument described in [2-1], wherein,

[0258] The protrusion of the first writing character can be released by pressing the first pressing mechanism.

[0259] [2-3]

[0260] According to the multi-core writing instrument described in [2-1] or [2-2], wherein,

[0261] The extension mechanism includes: an extension cam disposed within the pen barrel in a manner capable of moving back and forth and rotating about a central axis, and having a first cam portion and a second cam portion facing forward; a first cam support portion disposed on the inner circumferential surface of the pen barrel and facing rearward; and a push cam disposed in front of the extension cam in a manner capable of moving back and forth within the pen barrel, and having a second cam support portion facing rearward.

[0262] The first writing element moves forward along with the advance of the click cam.

[0263] In the first cam portion and the first cam support portion, one has a first inclined surface that is circumferentially inclined, and the other has a first actuating portion that can slide along the first inclined surface.

[0264] In the second cam portion and the second cam support portion, one has a second inclined surface that is inclined circumferentially in the direction opposite to the first inclined surface, and the other has a second actuating portion that can slide along the second inclined surface.

[0265] The multi-core writing instrument is configured such that when the extension cam is advanced by a press operation, the first cam portion and the first cam support portion cooperate to rotate the extension cam. As the extension cam advances and rotates, the second cam portion and the second cam support portion cooperate to advance the press cam. The advance amount of the first writing element is greater than the advance amount of the extension cam.

[0266] [2-4]

[0267] According to the multi-core writing instrument described in [2-3], wherein,

[0268] In the first cam portion and the first cam support portion, one has at least two first inclined surfaces arranged symmetrically about a central axis, and the other has at least two first actuating portions arranged symmetrically about a central axis in a corresponding manner.

[0269] In the second cam portion and the second cam support portion, one has at least two second inclined surfaces arranged symmetrically about a central axis, and the other has at least two second actuating portions arranged symmetrically about a central axis in a corresponding manner.

[0270] [2-5]

[0271] According to the multi-core writing instrument described in [2-3] or [2-4], wherein,

[0272] The extended cam is formed in a cylindrical shape, and the first cam portion is positioned radially outward compared to the second cam portion.

[0273] [2-6]

[0274] According to the multi-core writing instrument described in [2-3] or [2-4], wherein,

[0275] The extended cam is formed in a cylindrical shape, and the first cam portion and the second cam portion are arranged on the same circumference.

[0276] [2-7]

[0277] The multi-core writing instrument according to any one of [2-3] to [2-6], wherein,

[0278] At least one of the first and second functional parts has an inclined surface that is at least partially complementary to the corresponding first or second inclined surface.

[0279] [2-8]

[0280] The multi-core writing instrument according to any one of [2-3] to [2-6], wherein,

[0281] At least one of the first functional part and the second functional part has a convex curved surface.

[0282] [2-9]

[0283] The multi-core writing instrument according to any one of [2-3] to [2-8], wherein,

[0284] The pitch of the second inclined plane is set to be the same as or greater than the pitch of the first inclined plane.

[0285] Furthermore, according to the above-described embodiments, the following [3-1] to [3-8] are provided.

[0286] [3-1]

[0287] A pen clip for writing instruments, characterized in that,

[0288] The pen clip used with this writing instrument has the following features:

[0289] Pen clip body; and

[0290] A U-shaped leaf spring includes a first end mounted on the side of the pen barrel, a second end mounted on the pen clip body, and a curved portion connecting the first end and the second end.

[0291] The curved portion has a concave inflection point on the first end side.

[0292] [3-2]

[0293] According to the pen clip for the writing instrument described in [3-1], wherein,

[0294] The pen clip is configured such that its proximity point relative to the central axis of the mounted pen barrel is located at the bend.

[0295] [3-3]

[0296] According to [3-1] or [3-2], the pen clip for the writing instrument, wherein,

[0297] The pen clip body has an abutting portion that can abut against the pen barrel side to limit the opening of the pen clip for the writing instrument.

[0298] [3-4]

[0299] A writing instrument, characterized in that,

[0300] This writing instrument has the following features:

[0301] pen;

[0302] Pen clip for writing instruments installed on any one of [3-1] to [3-3] of the pen barrel;

[0303] A first writing style, disposed within the pen barrel; and

[0304] The operating part is configured to protrude rearward from the pen barrel and selectively cause the first writing element to protrude from the front end of the pen barrel.

[0305] The operating part is disposed off-center from the central axis of the pen barrel, away from the pen clip used for writing instruments.

[0306] [3-5]

[0307] According to the writing instrument described in [3-4], wherein,

[0308] This writing instrument has the following features:

[0309] At least one second writing element is disposed within the pen barrel;

[0310] A first actuating mechanism, comprising the first writing element and an extension mechanism, is configured such that, by means of the extension mechanism, the first writing element selectively protrudes from the front end of the pen barrel through a actuating operation of the operating part; and

[0311] The second click mechanism, which includes the second writing element, is configured to selectively cause the second writing element to protrude from the front end of the pen barrel by means of a click operation.

[0312] The extension mechanism is configured to advance the first writing element in such a way that the advance amount of the first writing element is greater than the press amount of the press operation.

[0313] [3-6]

[0314] According to the writing instrument described in [3-4] or [3-5], wherein,

[0315] The writing instrument also includes a spring that applies a rearward force to the operating part.

[0316] The writing instrument is configured such that the axial arrangement of the operating part is different in the writing state and the non-writing state.

[0317] [3-7]

[0318] According to the writing instrument described in [3-6], wherein,

[0319] The writing instrument is configured such that, in the writing state, the operating part is positioned at a fixed position between the forward limit and the backward limit in the axial direction.

[0320] [3-8]

[0321] According to the writing instrument described in [3-7], wherein,

[0322] An insertion hole is formed at the rear end of the pen barrel for the operating part to pass through, and a fixing protrusion is formed on the inner wall surface of the insertion hole. The writing instrument is configured such that the operating part is engaged with the fixing protrusion and disposed in the fixed position.

[0323] Explanation of reference numerals in the attached figures

[0324] 1. Writing instrument; 2. Pen barrel; 3. Front pen barrel; 4. Rear pen barrel; 5. Top crown; 6. Pen refill; 7. Spring; 8. Press button; 10. Extension mechanism; 20. Outer cam; 21. Rotating cam support; 22. Locking cam surface; 23. Outer cam protrusion; 24. Fourth inclined surface; 30. Extension cam; 31. Cam body; 32. Large diameter section; 33. Rotating cam section; 34. First inclined surface; 35. Push-out cam section; 36. Second inclined surface; 40. Press-out cam; 41. First protrusion; 42. Push-out cam support; 43. Third inclined surface; 44. Second protrusion; 45. Cam surface; 50. Rotating body; 51. Small diameter section; 52. Large diameter section; 53. Inner cam; 54. Inner cam protrusion.

Claims

1. A push-button writing instrument, characterized in that, This push-button writing instrument has the following features: pen; A first writing style, disposed within the pen barrel; and The first click mechanism, comprising the first writing element and an extension mechanism, is configured such that, by means of the extension mechanism, the first writing element selectively protrudes from the front end of the pen barrel via a click operation. The extension mechanism is configured to advance the first writing object in such a way that the advance amount of the first writing object is greater than the click amount of the click operation. The extension mechanism includes: an extension cam disposed within the pen barrel in a manner capable of moving back and forth and rotating about a central axis, and having a first cam portion and a second cam portion facing forward; a first cam support portion disposed on the inner circumferential surface of the pen barrel and facing rearward; and a push cam disposed in front of the extension cam in a manner capable of moving back and forth within the pen barrel, and having a second cam support portion facing rearward. The first writing element moves forward along with the advance of the click cam. In the first cam portion and the first cam support portion, one has a first inclined surface that is circumferentially inclined, and the other has a first actuating portion that can slide along the first inclined surface. In the second cam portion and the second cam support portion, one has a second inclined surface that is inclined circumferentially in the direction opposite to the first inclined surface, and the other has a second actuating portion that can slide along the second inclined surface. The push-button writing instrument is configured such that when the extension cam is advanced by a push-button operation, the first cam portion and the first cam support portion cooperate to rotate the extension cam. As the extension cam advances and rotates, the second cam portion and the second cam support portion cooperate to advance the push-button cam. The advance amount of the first writing element is greater than the advance amount of the extension cam.

2. The push-button writing instrument according to claim 1, wherein, This push-button writing instrument also features: At least one second writing element disposed within the pen barrel; and The second press mechanism, which includes the second writing element, is configured to selectively cause the second writing element to protrude from the front end of the pen barrel by means of a press operation.

3. The push-button writing instrument according to claim 2, wherein, The protrusion of the first writing character can be released by pressing the first pressing mechanism.

4. The push-button writing instrument according to claim 2, wherein, In the first cam portion and the first cam support portion, one has at least two first inclined surfaces arranged symmetrically about a central axis, and the other has at least two first actuating portions arranged symmetrically about a central axis in a corresponding manner. In the second cam portion and the second cam support portion, one has at least two second inclined surfaces arranged symmetrically about a central axis, and the other has at least two second actuating portions arranged symmetrically about a central axis in a corresponding manner.

5. The clickable writing instrument according to claim 2, wherein, The extended cam is formed in a cylindrical shape, and the first cam portion is positioned radially outward compared to the second cam portion.

6. The push-button writing instrument according to claim 2, wherein, The extended cam is formed in a cylindrical shape, and the first cam portion and the second cam portion are arranged on the same circumference.

7. The push-button writing instrument according to claim 2, wherein, At least one of the first and second functional parts has an inclined surface that is at least partially complementary to the corresponding first or second inclined surface.

8. The push-button writing instrument according to claim 2, wherein, At least one of the first functional part and the second functional part has a convex curved surface.

9. The clickable writing instrument according to claim 2, wherein, The pitch of the second inclined plane is set to be the same as or greater than the pitch of the first inclined plane.

10. The clickable writing instrument according to claim 1, wherein, This push-button writing instrument also features a pen clip. The pen clip has: Pen clip body; and A U-shaped leaf spring includes a first end mounted on the pen barrel, a second end mounted on the pen clip body, and a curved portion connecting the first end and the second end. The curved portion has a concave inflection point on the first end side.

11. The clickable writing instrument according to claim 10, wherein, The pen clip is configured such that the point of proximity to the central axis of the pen barrel is located at the bend.

12. The push-button writing instrument according to claim 10, wherein, The pen clip body has an abutting portion that can abut against the pen barrel to limit the opening of the pen clip.

13. The push-button writing instrument according to claim 10, wherein, The push-button writing instrument also includes an operating part that protrudes rearward from the pen barrel and is configured to selectively cause the first writing element to protrude from the front end of the pen barrel. The operating part is disposed off-center from the central axis of the pen barrel in a manner that is away from the pen clip.

14. The push-button writing instrument according to claim 13, wherein, This push-button writing instrument also features: At least one second writing element disposed within the pen barrel; and The second press mechanism, which includes the second writing element, is configured to selectively cause the second writing element to protrude from the front end of the pen barrel by means of a press operation.

15. The clickable writing instrument according to claim 13, wherein, The push-button writing instrument also includes a spring that applies a rearward force to the operating part. The push-button writing instrument is configured such that the axial arrangement of the operating part is different in the writing state and the non-writing state.

16. The push-button writing instrument according to claim 13, wherein, The push-button writing instrument is configured such that, in the writing state, the operating part is positioned at a fixed position between the forward limit and the backward limit in the axial direction.

17. The push-button writing instrument according to claim 16, wherein, An insertion hole is formed at the rear end of the pen barrel for the operating part to pass through, and a fixing protrusion is formed on the inner wall surface of the insertion hole. The push-button writing instrument is configured such that the operating part is engaged with the fixing protrusion and disposed in the fixed position.

Images