JP2023180879A - Extendable/retractable writing instrument - Google Patents

Abstract

To provide an extendable/retractable writing instrument having a new extendable/retractable mechanism.SOLUTION: An extendable/retractable writing instrument 200 includes: a barrel 203; a cap 209 which has a knock cam 230 and may fit in a rear end of the barrel 203; a rotor 240 biased rearward in the barrel 203; and an outer cam 220 provided on an inner surface of the barrel 203. The knock cam 230 and the outer cam 220 are configured to cooperate with the rotor 240 to rotate the rotor 240. The extendable/retractable writing instrument 200 may switch its state between a writing state in which the rotor 240 and the outer cam 220 are engaged and a non-writing state in which the engagement between the rotor 240 and the outer cam 220 is released. When the rear end of the barrel 203 is inserted into the cap 209, the knock cam 230 presses the rotor 240 to cause the rotor 240 to move forward and rotate. The rotor 240 is restricted from rotating by contact with the knock cam 230 in a circumferential direction to engage with the outer cam 220 and thereby bring the extendable/retractable writing instrument 200 into the writing state.SELECTED DRAWING: Figure 26

Description

The present invention relates to a retractable writing instrument.

The rear end of the barrel has an operating section, and by performing a knocking operation that pushes the operating section forward against the biasing force of a spring placed inside the barrel, a refill containing ink, i.e., a writing device, is created. A non-writing state in which the writing part, which is the nib of the pen, protrudes from the tip of the barrel, and the writing part retracts into the barrel by a second knock operation or by operating a release part that is different from the operating part. A retractable writing instrument that is a so-called knock type is known (for example, Patent Document 1 and Patent Document 2).

The retractable writing instrument described in Patent Document 1 has a cap that can be fitted to the front end of the barrel and functions as an operating section, mainly to prevent ink from evaporating from the writing section at the tip of the refill when not in use. are doing. In the retractable writing instrument described in Patent Document 1, when the writing instrument is used as an operating section and is switched from a non-writing state to a writing state, the cap is fitted to the rear end of the barrel to perform a knocking operation.

The retractable writing instrument described in Patent Document 2 has a cap that functions as an operating section to prevent the operating section from being unintentionally pressed forward and changing from a non-writing state to a writing state. The retractable writing instrument described in Patent Document 2 is configured such that a knock operation cannot be performed unless the cap is fitted to the rear end of the barrel.

Utility Model Publication No. 1-131587 Japanese Patent Application Publication No. 2015-143001

In the retractable writing instruments described in Patent Documents 1 and 2, the cap can be removed from the rear end of the barrel and fitted into the front end while the writing portion remains in the writing state in which it protrudes from the barrel. In a writing state, if the axis of the cap is oblique and the cap attempts to fit into the front end of the barrel, the inside of the cap may come into contact with the writing portion and become stained with ink. In addition, when fitting the cap to the front end of the barrel while writing, there is a risk of accidentally touching the writing part, staining your hands with ink, or injuring yourself from the sharp tip of the writing part. be.

An object of the present invention is to provide a retractable writing instrument equipped with a novel retractable mechanism. The purpose of this is to prevent unintentional contact with the writing part and prevent contamination or injury.

According to one aspect of the present invention, a shaft cylinder, a cap having a knock cam and fitable to the rear end of the shaft cylinder, a rotor biased rearward within the shaft cylinder, and a rotor that is biased rearward within the shaft cylinder; an outer cam provided on an inner surface of a cylinder, the knock cam and the outer cam are configured to cooperate with the rotor to rotate the rotor, and the rotor is configured to rotate the rotor with the outer cam. The retractable writing instrument is capable of switching between an engaged writing state and a non-writing state in which the rotor disengages from the outer cam, and the writing instrument is capable of switching between an engaged writing state and a non-writing state in which the rotor disengages from the outer cam. The knock cam presses the rotor to advance and rotate the rotor, rotation of the rotor is regulated by circumferential contact with the knock cam, and the rotor engages with the outer cam. A retractable writing instrument is provided, which is configured to be in a writing state.

The outer cam is defined between a plurality of first cam parts arranged along the circumferential direction on the inner surface of the shaft cylinder and having a first cam surface on a front end surface, and the plurality of first cam parts. a plurality of guide grooves extending in the front-rear direction, the knock cam having a second cam portion configured to be movable in the front-rear direction within the guide groove and having a second cam surface on a front end surface; The rotor has a third cam portion configured to be movable in the front-rear direction within the guide groove and having a cam receiving surface on a rear end surface that cooperates with the first cam surface and the second cam surface, As the rear end of the shaft cylinder is inserted into the cap, the second cam surface presses the cam receiving surface to advance and rotate the rotor, and the third cam portion of the rotor A side surface may be configured to abut against a side surface of the second cam portion of the knock cam, and rotation of the rotor may be restricted. The first cam portion includes a fourth cam surface on the rear end surface, and as the rear end portion of the barrel is inserted into the cap, the second cam surface and the fourth cam surface cooperate, The cap may be configured to be rotated so that the second cam portion enters the guide groove. In the writing state, when the cap is removed from the rear end of the barrel, the rotation of the rotor is no longer restricted by the knock cam, and the rotor rotates, and the rotor engages with the outer cam. It may be configured to be released and placed in a non-writing state. A locking part is formed on the outer surface of the barrel, and a locked part is formed on the inner surface of the cap, and as the rear end of the barrel is inserted into the cap, the locking part and the When the locked portion is locked, the rotor may be configured to contact the knock cam in the circumferential direction. The rear end portion of the rotor may be located further forward than the rear end portion of the shaft cylinder.

According to the aspects of the present invention, the common effect of providing a retractable writing instrument equipped with a novel retractable mechanism is achieved. This makes it possible to prevent unintentional contact with the writing part and prevent contamination or injury.

FIG. 1 is a perspective view of the retractable writing instrument according to the first embodiment in a non-writing state. FIG. 2 is a perspective view of the retractable writing instrument of FIG. 1 in a writing state. FIG. 3 is a longitudinal sectional view of the retractable writing instrument of FIG. 1 in a non-writing state. FIG. 4 is a longitudinal cross-sectional view of the retractable writing instrument shown in FIG. 1 in a writing state. FIG. 5 is a longitudinal cross-sectional view of the rear end of the barrel of the retractable writing implement shown in FIG. FIG. 6 is a perspective view of the knock cam of the retractable writing instrument shown in FIG. FIG. 7 is a perspective view of the rotor of the retractable writing implement of FIG. 1. FIG. 8 is a perspective view of the retractable mechanism of the retractable writing implement of FIG. 1 in a writing state. FIG. 9 is a schematic diagram of a retractable mechanism showing switching of the retractable writing instrument of FIG. 1 from a non-writing state to a writing state. FIG. 10 is a schematic diagram of a retractable mechanism showing switching from a writing state to a non-writing state of the retractable writing instrument of FIG. 1. FIG. 11 is a longitudinal sectional view of the retractable writing instrument according to the second embodiment in a non-writing state. FIG. 12 is a longitudinal sectional view of the retractable writing instrument of FIG. 11 in a writing state. FIG. 13 is a longitudinal cross-sectional view of the rear end of the barrel of the retractable writing instrument shown in FIG. 11. FIG. 14 is a perspective view of the knock cam of the retractable writing instrument shown in FIG. 11. FIG. 15 is a perspective view of the rotor of the retractable writing instrument of FIG. 11. FIG. 16 is a perspective view of the retractable mechanism of the retractable writing instrument of FIG. 11 in a writing state. FIG. 17 is a schematic diagram of a retractable mechanism showing switching from a non-writing state to a writing state of the retractable writing instrument of FIG. 11. FIG. 18 is a schematic diagram of a retractable mechanism showing switching from a writing state to a non-writing state of the retractable writing instrument of FIG. 11. FIG. 19 is a longitudinal sectional view of the retractable writing instrument according to the third embodiment in a non-writing state. FIG. 20 is a longitudinal sectional view of the retractable writing instrument of FIG. 19 with the cap disposed at the rear end of the barrel. FIG. 21 is a longitudinal sectional view of the retractable writing instrument of FIG. 19 in a writing state. FIG. 22 is a longitudinal sectional view of the rear end of the barrel of the retractable writing implement shown in FIG. 19. FIG. 23 is a perspective view of the knock cam of the retractable writing instrument shown in FIG. 19. FIG. 24 is a perspective view of the rotor of the retractable writing implement of FIG. 19. FIG. 25 is a perspective view of the retractable mechanism of the retractable writing instrument of FIG. 19 in a writing state. FIG. 26 is a schematic diagram of a retractable mechanism showing switching from a non-writing state to a writing state of the retractable writing instrument of FIG. 19. FIG. 27 is a schematic diagram of a retractable mechanism showing switching from a writing state to a non-writing state of the retractable writing instrument of FIG. 19.

Embodiments of the present invention will be described in detail below with reference to the drawings. Corresponding components are provided with common reference numerals throughout the drawings.

1 is a perspective view of the retractable writing instrument 1 according to the first embodiment in a non-writing state, FIG. 2 is a perspective view of the retractable writing instrument 1 of FIG. 1 in a writing state, and FIG. 3 is a perspective view of the retractable writing instrument 1 of FIG. 4 is a longitudinal sectional view of the retractable writing instrument 1 in a non-writing state, and FIG. 4 is a longitudinal sectional view of the retractable writing instrument 1 of FIG. 1 in a writing state.

The retractable writing instrument 1 includes a barrel 3 that is formed in a cylindrical shape and includes a tip member 2, a refill 5 that is a writing body disposed inside the barrel 3 and has a writing part 4 at one end, and the refill 5. It has a spring 6 that urges backward, and a retractable mechanism 10 arranged at the rear end of the shaft cylinder 3. The refill 5 is, for example, a refill for a ballpoint pen. The retraction mechanism 10 includes an outer cam 20, a knock cam 30, and a rotor 40. The tip member 2 disposed at the front end of the barrel 3 is tapered toward the front, and has a through hole through which the writing portion 4 of the refill 5 protrudes.

In this specification, in the axial direction of the retractable writing instrument, the writing section side is defined as the "front" side, and the side opposite to the writing section is defined as the "rear" side. In the retractable writing instrument 1, the refill 5 moves in the longitudinal direction within the barrel 3 by the retractable mechanism 10. At this time, the state in which the writing part 4 is recessed into the barrel 3 is referred to as a non-writing state (FIGS. 1 and 3), and the state in which the writing part 4 protrudes from the barrel 3 is referred to as a writing state (FIGS. 2 and 4). It is called.

An operating section 7 is provided at the rear end of the retractable writing instrument 1, that is, at the rear end of the barrel 3. The operating section 7 has a knock cam 30. The retractable writing instrument 1 is a so-called knock-type writing instrument that enters a writing state by a knocking operation of pressing the operating portion 7 forward. In particular, as shown in FIG. 2, the shaft tube 3 is formed with a flat portion 3a extending forward from the rear end, and the flat portion 3a is formed with a cutout portion 3b extending forward from the rear end. The operating portion 7 has a clip 8 extending forward along the side surface of the shaft tube 3. The clip 8 is connected to the operating section 7 via the notch 3b.

FIG. 5 is a longitudinal cross-sectional view of the rear end portion of the barrel 3 of the retractable writing instrument 1 shown in FIG. In FIG. 5, the lower side is the front of the retractable writing instrument 1. An outer cam 20 that constitutes a part of the projecting/retracting mechanism 10 is provided on the inner surface of the rear end portion of the shaft cylinder 3 . The outer cam 20 has four protruding first cam portions 21 arranged at equal intervals along the circumferential direction on the inner surface of the shaft cylinder 3. The first cam portions 21 extend in the front-rear direction, and their rear portions are connected to each other in an annular shape. A first cam surface 22 is provided on the front end surface of the first cam portion 21 . The first cam surface 22 is a surface inclined along the circumferential direction. Four guide grooves 23 extending in the front-rear direction are defined between the four first cam parts 21 . Therefore, the outer cam 20 has four first cam parts 21 and four guide grooves 23. A regulating surface 24 is provided at a portion of the rear end of the guide groove 23 to which the first cam portion 21 is connected.

FIG. 6 is a perspective view of the knock cam 30 of the retractable writing instrument 1 shown in FIG. In FIG. 6, the lower side is the front of the retractable writing instrument 1. The knock cam 30 is provided integrally with the operating section 7. The rear part of the operation part 7 is a cylindrical member, and a mounting hole 7a for connecting the clip 8 is provided on the side surface. The knock cam 30 disposed at the front of the operating portion 7 has four second cam portions 31 arranged at equal intervals along the circumferential direction and extending in the front-rear direction. Each of the second cam parts 31 is disposed within the guide groove 23 of the outer cam 20 so as to be movable in the front-rear direction. A second cam surface 32 is provided on the front end surface of the second cam portion 31 . The second cam surface 32 is a surface that is inclined along the circumferential direction similarly to the first cam surface 22 of the outer cam 20. A first contact surface 33 is provided on a side surface of the second cam portion 31 in the circumferential direction. A locking surface 34 is provided on the rear end surface of the second cam portion 31 .

FIG. 7 is a perspective view of the rotor 40 of the retractable writing instrument 1 of FIG. 1. In FIG. 7, the lower side is the front of the retractable writing instrument 1. The rotor 40 has four third cam portions 41 arranged at equal intervals along the circumferential direction and extending in the front-rear direction. The four third cam parts 41 constitute an inner cam. Each of the third cam portions 41 is disposed within the guide groove 23 of the outer cam 20 so as to be movable in the front-rear direction. A cam receiving surface 42 is provided on the rear end surface of the third cam portion 41 . The cam receiving surface 42 is a surface that faces the first cam surface 22 of the outer cam 20 and the second cam surface 32 of the knock cam 30 and is similarly inclined along the circumferential direction. The rear end surface of the refill 5 biased by the spring 6 comes into contact with the front end surface of the rotor 40 . Therefore, the rotor 40 is always urged backward by the spring 6 via the refill 5. A second contact surface 43 is provided on a side surface of the third cam portion 41 in the circumferential direction.

FIG. 8 is a perspective view of the retractable mechanism 10 of the retractable writing instrument 1 of FIG. 1 in a writing state. In FIG. 8, the outer cam 20 is omitted. In the writing state, the third cam portion 41 of the rotor 40 is engaged with the first cam portion 21 of the outer cam 20, as will be described later with reference to FIG. At this time, the rotation of the rotor 40 is regulated by the rotor 40 contacting the knock cam 30 in the circumferential direction, specifically, by the second contact surface 43 contacting the first contact surface 33. , maintaining the written state.

FIG. 9 is a schematic diagram of the retractable mechanism 10 showing switching of the retractable writing instrument 1 of FIG. 1 from the non-writing state to the writing state. That is, FIG. 9 is a schematic diagram showing the positional relationship among the outer cam 20, the knock cam 30, and the rotor 40. The position of the third cam portion 41 of the rotor 40 is shown. In the figure, the lower side is the front of the retractable writing instrument 1, and the upper side is the rear of the retractable writing instrument 1. The rotor 40 is given a rotational force by the cooperation of the first cam surface 22 of the outer cam 20 or the second cam surface 32 of the knock cam 30 and the cam receiving surface 42 of the rotor 40, and rotates around the central axis. Rotate to one side. Therefore, the rotor 40 moves from right to left in FIG. 9 .

FIG. 9(A) is a schematic diagram of the retractable mechanism 10 of the retractable writing instrument 1 in a non-writing state. In the non-writing state, the second cam part 31 of the knock cam 30 and the third cam part 41 of the rotor 40, which is biased backward by the spring 6 via the refill 5, are in the guide groove 23 between the outer cams 20. is located at the rear of the Retraction of the knock cam 30 and the rotor 40 is regulated by the locking surface 34 of the knock cam 30 locking with the restriction surface 24 of the outer cam 20. Therefore, in this state, the writing section 4 is recessed into the barrel 3.

From the state shown in FIG. 9A, by performing a knocking operation to press the operating portion 7 against the biasing force of the spring 6, the knock cam 30 and the rotor 40 are moved forward. At this time, the second cam portion 31 of the knock cam 30 and the third cam portion 41 of the rotor 40 move forward within the guide groove 23. Further, the knock cam 30 and the rotor 40 receive component forces in the circumferential direction in opposite directions through the slopes of the second cam surface 32 and the cam receiving surface 42, but the second cam portion 31 of the knock cam 30 or the rotation Movement in the circumferential direction, that is, rotation, is restricted by contact between the third cam portion 41 of the child 40 and the side surface of the first cam portion 21 of the outer cam 20.

When the knock cam 30 and the rotor 40 move further forward, the rear end of the third cam part 41 of the rotor 40 passes over the front end of the outer cam 20, that is, the first cam part 21 in the front-rear direction, and reaches the first cam surface 22. and the second cam surface 32, and the restriction on the rotation of the rotor 40 by the outer cam 20 is released (FIG. 9(B)). As a result, the rotor 40 biased backward receives a component force in the circumferential direction from the second cam surface 32 and the first cam surface 22, and the cam receiving surface 42 pushes against the second cam surface 32 and the first cam surface 22. The rotor 40 rotates around the central axis while sliding in sequence (FIG. 9(C)).

The third cam portion 41 of the rotor 40 moves along the second cam surface 32 of the knock cam 30 and the first cam surface 22 of the outer cam 20 in this order until it comes into contact with the side surface of the second cam portion 31 of the knock cam 30. . That is, the rotation of the rotor 40 is stopped and regulated by the second contact surface 43 coming into contact with the first contact surface 33 of the knock cam 30. At this time, the backward movement of the rotor 40, which is urged backward, is restricted by the engagement of the third cam part 41 with the first cam part 21 (FIG. 9(D)). In short, by engaging the rotor 40 with the outer cam 20, the state in which the writing part 4 of the refill 5 disposed in front of the rotor 40 protrudes from the barrel 3 is maintained, and the retractable writing instrument 1 is in the writing state. becomes.

Note that although the spring 6 biases the rotor 40 rearward via the refill 5, in the writing state, the biasing force is supported only by the outer cam 20 as shown in FIG. 9(D). . Therefore, in the writing state, no force is applied that would cause the knock cam 30, that is, the operating portion 7, to retreat.

FIG. 10 is a schematic diagram of the retractable mechanism 10 showing switching of the retractable writing instrument 1 of FIG. 1 from the writing state to the non-writing state. In FIG. 10, the positional relationship among the outer cam 20, knock cam 30, and rotor 40 is shown in the same way as in FIG. 9.

FIG. 10(A) is a schematic diagram of the retractable writing instrument 1 in the writing state, and is the same schematic diagram as FIG. 9(D). From the state shown in FIG. 10(A), for example, by sliding the clip 8 backward, the operating portion 7 and, by extension, the knock cam 30 are moved back (FIG. 10(B)). When the knock cam 30 moves backward, the front end of the second cam part 31 of the knock cam 30 passes over the rear end of the rotor 40, that is, the third cam part 41 in the front-rear direction, and the first cam surface 22 and the second cam surface 32 match, and the restriction on the rotation of the rotor 40 by the knock cam 30 is released. As a result, the rotor 40, which is urged backward, receives a circumferential force from the first cam surface 22, and the cam receiving surface 42 rotates while sliding on the first cam surface 22 and the second cam surface 32 in order. The child 40 further rotates around the central axis (FIG. 10(C)).

The third cam portion 41 of the rotor 40 moves along the first cam surface 22 of the outer cam 20 and the second cam surface 32 of the knock cam 30 until it comes into contact with the side surface of the first cam portion 21 of the outer cam 20. do. Thereby, the rotation of the rotor 40 is stopped and regulated (FIG. 10(D)). In this state, since the rotor 40 is disengaged from the outer cam 20, the rotor 40 and the knock cam 30 are moved backward in the guide groove 23 by the urging force of the spring 6. The retraction of the knock cam 30 and the rotor 40 is regulated by the locking surface 34 of the knock cam 30 locking with the regulating surface 24 of the outer cam 20 (FIG. 10(E)). In short, by disengaging the rotor 40 from the outer cam 20, the writing part 4 of the refill 5 disposed in front of the rotor 40 remains recessed into the barrel 3, and the retractable writing instrument 1 It becomes a non-writing state. Note that FIG. 10(E) is the same schematic diagram as FIG. 9(A).

According to the first embodiment described above, it is possible to provide a retractable writing instrument 1 equipped with a novel retractable mechanism 10. Thereby, it is possible to prevent rattling of the operating section 7 and prevent impact on the refill 5 with a simpler structure.

That is, as described above with reference to FIG. 9, in the writing state, the rotor 40 biased rearward pushes against the knock cam 30 via the first cam surface 22 of the outer cam 20 and the slope of the cam receiving surface 42. is subjected to a component force in the circumferential direction that presses the Therefore, the knock cam 30 in the writing state is held between the first cam portion 21 of the outer cam 20 and the third cam portion 41 of the rotor 40. Therefore, the operation part 7 does not rattle due to repeated contact between the writing surface and the writing part 4 caused by the writing operation, and noise and vibration caused by rattling, deterioration of the writing feel, etc., are prevented. Ru. Additionally, there is no need for any additional structure to prevent the operating part 7 from wobbling, such as adding a spring that always urges the operating part 7 backward, and the structure is made up of a minimum number of parts. Because of this, it is possible to realize a retraction mechanism with a very simple structure.

In a typical knock-type writing instrument, it is necessary to move the rotor further forward than in the writing state to disengage the outer cam by performing a knock operation to switch from the writing state to the non-writing state. As a result, the amount of movement of the refill biased by the spring from the forward position to the non-writing position was large. Regarding click sounds or impact sounds, the first sound was generated when the rotor moved forward due to a knocking operation, and the second sound was generated when the rotor moved backward and entered a non-writing state.

On the other hand, in the first embodiment described above, there is no need to advance the rotor 40 and, by extension, the refill 5 by the knocking operation when switching from the writing state to the non-writing state, so that the amount of movement of the refill 5 can be minimized. can do. Thereby, it is possible to prevent an impact from being applied to the refill 5, to prevent air from entering the refill 5 due to the impact, and to prevent writing defects from occurring. Further, since the click sound or impact sound is generated only when the rotor 40 moves backward and enters the non-writing state, it is possible to quietly switch between the writing state and the non-writing state.

In the retractable writing instrument 1 according to the first embodiment described above, the operating section 7 is provided so as to protrude from the rear end of the barrel 3, but the operating section may also be provided on the side surface of the barrel, that is, on the outer peripheral surface. good. Further, although the retractable writing instrument 1 has the clip 8, it may not have the clip 8.

FIG. 11 is a longitudinal sectional view of the retractable writing instrument 100 according to the second embodiment in a non-writing state, and FIG. 12 is a longitudinal sectional view of the retractable writing instrument 10 of FIG. 11 in a writing state.

The retractable writing instrument 100 includes a barrel 103 that is formed in a cylindrical shape and includes a tip member 2, a refill 5 that is a writing body disposed inside the barrel 103 and has a writing part 4 at one end, and the refill 5. It has a spring 6 that urges backward and a retractable mechanism 110 arranged at the rear end of the shaft cylinder 103. The retraction mechanism 110 includes an outer cam 120, a knock cam 130, and a rotor 140. The tip member 2 disposed at the front end of the barrel 103 is tapered toward the front, and has a through hole through which the writing portion 4 of the refill 5 protrudes.

In the retractable writing instrument 100, the refill 5 moves in the longitudinal direction within the barrel 103 by the retractable mechanism 110. At this time, a state in which the writing part 4 is recessed into the barrel 103 is referred to as a non-writing state (FIG. 11), and a state in which the writing part 4 protrudes from the barrel 103 is referred to as a writing state (FIG. 12).

An operating section 107 is provided at the rear end of the retractable writing instrument 100, that is, at the rear end of the barrel 103. The operating section 107 has a knock cam 130. The retractable writing instrument 100 is a so-called knock-type writing instrument that enters a writing state by a knock operation of pressing the operating portion 107 forward. The operating section 107 has a cylindrical cover member 108 that covers the operating section 107 in the length direction. The cover member 108 is integrally connected to the operating section 107.

FIG. 13 is a longitudinal sectional view of the rear end portion of the barrel 103 of the retractable writing instrument 100 of FIG. 11. In FIG. 13, the lower side is the front of the retractable writing instrument 100. An outer cam 120 that constitutes a part of the projecting/retracting mechanism 110 is provided on the inner surface of the rear end portion of the shaft cylinder 103 . The outer cam 120 has four protruding first cam parts 121 arranged at equal intervals along the circumferential direction on the inner surface of the shaft cylinder 103. The first cam portions 121 extend in the front-rear direction, and their rear portions are connected to each other in an annular shape. A first cam surface 122 is provided on the front end surface of the first cam portion 121 . The first cam surface 122 is a surface inclined along the circumferential direction. Four guide grooves 123 extending in the front-rear direction are defined between the four first cam parts 121. Therefore, the outer cam 120 has four first cam parts 121 and four guide grooves 123. A regulating surface 124 is provided at a portion of the rear end of the guide groove 123 to which the first cam portion 121 is connected.

Note that the first cam surface 122 of the outer cam 120 of the retractable writing instrument 100 is a surface having the same inclination along the circumferential direction as the first cam surface 22 of the outer cam 20 of the retractable writing instrument 1 according to the first embodiment. However, the difference is that the surfaces are inclined in opposite directions.

A through hole 103a is formed in the rear end surface of the shaft tube 103 so that the operating section 107 can be inserted therein. A guide portion 103b having an outer diameter slightly smaller than the inner diameter of the cover member 108 is formed on the outer peripheral surface of the rear end of the shaft tube 103. The movement of the cover member 108, and ultimately the operating section 107, in the front-back direction is guided by the guide section 103b. A step portion 103c facing rearward is formed at the front end portion of the guide portion 103b. The forward movement of the cover member 108 and, by extension, the operating section 107 is restricted by the front end surface of the cover member 108 coming into contact with the stepped portion 103c.

FIG. 14 is a perspective view of the knock cam 130 of the retractable writing instrument 100 of FIG. 11. In FIG. 14, the lower side is the front of the retractable writing instrument 100. The knock cam 130 is provided integrally with the operating section 107. The operation unit 107 is a cylindrical member. The knock cam 130 disposed at the front of the operating portion 107 has four second cam portions 131 arranged at equal intervals along the circumferential direction and extending in the front-rear direction. Each of the second cam portions 131 is disposed within the guide groove 123 of the outer cam 120 so as to be movable in the front-rear direction. A second cam surface 132 is provided on the front end surface of the second cam portion 131. The second cam surface 132 is a surface having the same inclination along the circumferential direction as the first cam surface 122 of the outer cam 120, but differs in that it is a surface inclined in the opposite direction. A first contact surface 133 is provided on a side surface of the second cam portion 131 in the circumferential direction. A locking surface 134 is provided on the rear end surface of the second cam portion 131 .

Note that the first abutting surface 133 of the knock cam 130 of the retractable writing instrument 100 is different from the first abutting surface 33 of the knock cam 30 of the retractable writing instrument 1 according to the first embodiment than the second cam portion 131 that corresponds in the circumferential direction. It differs in that it is the opposite aspect of .

FIG. 15 is a perspective view of the rotor 140 of the retractable writing instrument 100 of FIG. 11. In FIG. 15, the lower side is the front of the retractable writing instrument 100. The rotor 140 has four third cam portions 141 arranged at equal intervals along the circumferential direction and extending in the front-rear direction. The four third cam parts 141 constitute an inner cam. Each of the third cam portions 141 is disposed within the guide groove 123 of the outer cam 120 so as to be movable in the front-rear direction. A cam receiving surface 142 is provided on the rear end surface of the third cam portion 141 . Each of the cam receiving surfaces 142 is formed in a chevron shape and has a first cam receiving surface 144 and a second cam receiving surface 145. The first cam receiving surface 144 and the second cam receiving surface 145 are surfaces inclined in opposite directions along the circumferential direction, and the third cam portion 141 is formed symmetrically. The first cam receiving surface 144 is a surface similarly inclined in the circumferential direction so as to face the second cam surface 132 of the knock cam 130 , and the second cam receiving surface 145 is a surface that is inclined in the circumferential direction so as to face the second cam surface 132 of the knock cam 130 . These surfaces are also inclined along the circumferential direction so as to face each other. The rear end surface of the refill 5 biased by the spring 6 comes into contact with the front end surface of the rotor 140 . Therefore, the rotor 140 is always urged backward by the spring 6 via the refill 5. A second contact surface 143 is provided on a side surface of the third cam portion 141 in the circumferential direction.

Note that the second abutting surface 143 of the rotor 140 of the retractable writing instrument 100 is different from the second abutting surface 43 of the rotor 40 of the retractable writing instrument 1 according to the first embodiment by a corresponding third cam in the circumferential direction. The difference is that the side surface is opposite to the portion 141.

FIG. 16 is a perspective view of the retractable mechanism 110 of the retractable writing instrument 100 of FIG. 11 in the writing state. In the writing state, the third cam portion 141 of the rotor 140 is engaged with the first cam portion 121 of the outer cam 120, as will be described later with reference to FIG. At this time, the rotation of the rotor 140 is regulated by the rotor 140 contacting the knock cam 130 in the circumferential direction, specifically, by the second contact surface 143 contacting the first contact surface 133. , maintaining the written state.

FIG. 17 is a schematic diagram of a retractable mechanism showing switching of the retractable writing instrument 100 of FIG. 11 from a non-writing state to a writing state. That is, FIG. 17 is a schematic diagram showing the positional relationship among the outer cam 120, the knock cam 130, and the rotor 140. The position of the third cam portion 141 of the rotor 140 is shown. In the figure, the lower side is the front of the retractable writing instrument 100, and the upper side is the rear of the retractable writing instrument 100. The rotor 140 is given a rotational force by the cooperation of the first cam surface 122 of the outer cam 120 or the second cam surface 132 of the knock cam 130 and the cam receiving surface 142 of the rotor 140, and is rotated within a predetermined angular range. Rotates in one direction or the other around the central axis.

FIG. 17(A) is a schematic diagram of the retractable mechanism 110 of the retractable writing instrument 100 in a non-writing state. In the non-writing state, the second cam part 131 of the knock cam 130 and the third cam part 141 of the rotor 140, which is biased backward by the spring 6 via the refill 5, are in the guide groove 123 between the outer cams 120. is located at the rear of the Retraction of the knock cam 130 and the rotor 140 is regulated by the locking surface 134 of the knock cam 130 locking with the regulating surface 124 of the outer cam 120. Therefore, in this state, the writing section 4 is recessed into the shaft tube 103.

From the state shown in FIG. 17A, by performing a knocking operation to press the operating portion 107 against the biasing force of the spring 6, the knocking cam 130 and the rotor 140 are moved forward. At this time, the second cam portion 131 of the knock cam 130 and the third cam portion 141 of the rotor 140 move forward within the guide groove 123. Further, the knock cam 130 and the rotor 140 are arranged in circumferential directions opposite to each other via the slopes of the second cam surface 132 and the cam receiving surface 142, specifically, the slopes of the second cam surface 132 and the first cam receiving surface 144. is receiving the power of However, the knock cam 130 and the rotor 140 are prevented from moving in the circumferential direction due to contact between the second cam portion 131 of the knock cam 130 or the third cam portion 141 of the rotor 140 and the side surface of the first cam portion 121 of the outer cam 120. Movement, or rotation, is restricted.

When the knock cam 130 and the rotor 140 move further forward, the rear end of the third cam part 141 of the rotor 140 crosses the front end of the outer cam 120, that is, the first cam part 121 in the front-rear direction, and the rotation by the outer cam 120 The restriction on the rotation of the child 140 is released (FIG. 17(B)). As a result, the rotor 140 biased backward receives a component force in the circumferential direction from the second cam surface 132, and the cam receiving surface 142, specifically the first cam receiving surface 144, While sliding, the rotor 140 rotates around the central axis in the first direction (FIG. 17(C)). The first direction is a direction from right to left in the figure.

When the rotor 140 rotates until the third cam portion 141 of the rotor 140 passes through the second cam surface 132 of the knock cam 130, the front end of the second cam portion 131 of the knock cam 130 touches the third cam of the rotor 140 in the front-rear direction. 141 and advances beyond the rear end of the section 141. At this time, the cam receiving surface 142 of the rotor 140, specifically the second cam receiving surface 145, contacts the first cam surface 122 of the outer cam 120. Next, due to the biasing force of the spring 6, the rotor 140 receives a component force in the circumferential direction via the slopes of the first cam surface 122 and the second cam receiving surface 145, and the rotor 140 receives a component force in the circumferential direction through the slopes of the first cam surface 122 and the second cam receiving surface 145, so that Rotate in the other direction, which is the second direction. The second direction is a direction from left to right in the figure.

The rotation of the rotor 140 is stopped and regulated by the second contact surface 143 contacting the first contact surface 133 of the knock cam 130 . At this time, the backward movement of the rotor 140, which is urged backward, is restricted by the engagement of the third cam part 141 with the first cam part 121 (FIG. 17(D)). In short, by engaging the rotor 140 with the outer cam 120, the state in which the writing part 4 of the refill 5 disposed in front of the rotor 140 protrudes from the barrel 103 is maintained, and the retractable writing instrument 100 is in the writing state. becomes.

Note that although the spring 6 biases the rotor 140 rearward via the refill 5, in the writing state, the biasing force is supported only by the outer cam 120 as shown in FIG. 17(D). . Therefore, in the writing state, no force is applied that would cause the knock cam 130, that is, the operating portion 107, to retreat.

FIG. 18 is a schematic diagram of the retractable mechanism 110 showing switching of the retractable writing instrument 100 of FIG. 11 from the writing state to the non-writing state. In FIG. 18, the positional relationship among the outer cam 120, knock cam 130, and rotor 140 is shown in the same manner as in FIG. 17.

FIG. 18(A) is a schematic diagram of the retractable writing instrument 100 in the writing state, and is the same schematic diagram as FIG. 17(D). From the state shown in FIG. 18A, by pulling the operating section 107 rearward, for example by pinching the outer periphery of the operating section 107, the operating section 107 and, by extension, the knock cam 130 are moved back. When the knock cam 130 moves backward, the front end of the second cam portion 131 of the knock cam 130 passes over the rear end of the rotor 140, that is, the third cam portion 141 in the front-rear direction, and the rotation of the rotor 140 is no longer restricted by the knock cam 130. It will be canceled. As a result, the rotor 140 biased backward receives a component force in the circumferential direction from the first cam surface 122, and the cam receiving surface 142, specifically the second cam receiving surface 145, While sliding, the rotor 140 rotates around the central axis in the second direction. Rotation of the rotor 140 is regulated by the first cam receiving surface 144 coming into contact with the second cam surface 132 of the knock cam 130 (FIG. 18(B)).

When the knock cam 130 further retreats, the third cam portion 141 of the rotor 140 moves along the first cam surface 122 of the outer cam 120 until it comes into contact with the side surface of the first cam portion 121 of the outer cam 120. Thereby, the rotation of the rotor 140 is stopped and regulated (FIG. 18(C)). In this state, since the rotor 140 is disengaged from the outer cam 120, the rotor 140 and the knock cam 130 are moved backward in the guide groove 123 by the urging force of the spring 6. The retraction of the knock cam 130 and the rotor 140 is regulated by the locking surface 134 of the knock cam 130 locking with the regulating surface 124 of the outer cam 120 (FIG. 18(E)). In short, by disengaging the rotor 140 from the outer cam 120, the writing part 4 of the refill 5 disposed in front of the rotor 140 remains recessed into the barrel 103, and the retractable writing instrument 100 It becomes a non-writing state. Note that FIG. 18(E) is the same schematic diagram as FIG. 17(A).

The retractable writing instrument 100 according to the second embodiment described above has the effect that the sound of the knock operation becomes quieter in addition to the effect described above regarding the retractable writing instrument 1 according to the first embodiment. That is, in the retractable writing instrument 100, the rotor 140 does not rotate in one direction around the central axis, but rotates in one direction or the other within a predetermined angular range, so the movement angle in one knocking operation is also smaller. Therefore, the sliding noise between the rotor 140 and the outer cam 120 or the knock cam 130 is reduced.

The configuration of the chevron-shaped cam receiving surface 142 of the rotor 140 of the retractable writing instrument 100 and the corresponding configurations of the outer cam 120 and the knock cam 130 are the same as the retractable writing instrument 1 according to the first embodiment described above and the second embodiment described later. The present invention is also applicable to a retractable writing instrument 200 according to the present invention.

FIG. 19 is a vertical cross-sectional view of the retractable writing instrument 200 according to the third embodiment in a non-writing state, and FIG. 20 is a state in which the cap 209 is disposed at the rear end of the barrel 203 in the retractable writing instrument 200 of FIG. 19. FIG. 21 is a vertical cross-sectional view of the retractable writing instrument 200 of FIG. 19 in a writing state.

The retractable writing instrument 200 includes a barrel 203 formed in a cylindrical shape and provided with a tip member 2, a refill 5 which is a writing body disposed within the barrel 203 and has a writing part 4 at one end, and a refill 5. It has a spring 6 that urges backward and a retractable mechanism 210 arranged at the rear end of the shaft tube 203. The retraction mechanism 210 includes an outer cam 220, a knock cam 230, and a rotor 240. The tip member 2 disposed at the front end of the barrel 203 is tapered toward the front, and has a through hole through which the writing portion 4 of the refill 5 protrudes.

In the retractable writing instrument 200, the refill 5 moves in the longitudinal direction within the barrel 203 by the retractable mechanism 210. At this time, a state in which the writing part 4 is recessed into the barrel 203 is referred to as a non-writing state (FIG. 19), and a state in which the writing part 4 protrudes from the barrel 203 is referred to as a writing state (FIG. 21).

A cap 209 can be fitted to the front end and the rear end of the retractable writing instrument 200, that is, the front end and the rear end of the shaft tube 203. In this specification, in the axial direction of the cap 209, the open end side is defined as the "front" side, and the closed end side is defined as the "rear" side. The cap 209 has a knock cam 230. As described later, the retractable writing instrument 200 can be switched from the non-writing state to the writing state by fitting the cap 209 to the rear end of the barrel 203, and by removing the cap 209 from the rear end of the barrel 203. The writing state can be switched from the writing state to the non-writing state.

A through hole 203a is formed in the rear end surface of the shaft tube 203. A first locking portion 203b is formed on the front outer surface of the shaft tube 203, and a second locking portion 203c is formed on the rear outer surface of the shaft tube 203. On the other hand, a locked portion 209a is formed on the inner surface of the cap 209. The first locking portion 203b and the second locking portion 203c are annular convex portions formed on the outer surface of the shaft tube 203. The locked portion 209a is an annular recess formed on the inner surface of the cap 209 and complementary to the first locking portion 203b and the second locking portion 203c. By fitting and locking the first locking portion 203b or second locking portion 203c of the shaft tube 203 with the locked portion 209a of the cap 209, the cap 209 is fixed to the front end or rear end of the shaft tube 203. It can be fitted into the section.

Note that the first locking portion and the second locking portion of the shaft tube 203 are formed as recesses, the locked portion of the cap 209 is formed as a convex portion, and the cap 209 is formed as a front end portion or a rear end portion of the shaft tube 203. It may also be made to fit. Further, the first locking portion and the second locking portion of the shaft tube 203 and the locked portion of the cap 209 are all formed as convex portions, and the locked portion of the cap 209 is the first locking portion of the shaft tube 203. The cap 209 may be fitted to the front end or the rear end of the shaft tube 203 by climbing over and locking the stop portion or the second lock portion.

FIG. 22 is a longitudinal sectional view of the rear end portion of the barrel 203 of the retractable writing instrument 200 of FIG. 19. In FIG. 22, the lower side is the front of the retractable writing instrument 200. An outer cam 220 that constitutes a part of the projecting/retracting mechanism 210 is provided on the inner surface of the rear end portion of the shaft cylinder 203 . The outer cam 220 has four protruding first cam portions 221 arranged at equal intervals along the circumferential direction on the inner surface of the shaft cylinder 203. The first cam portion 221 extends in the front-rear direction, and has an annular portion 221a formed at the rear thereof and connected to each other in an annular manner. A first cam surface 222 is provided on the front end surface of the first cam portion 221 . The first cam surface 222 is a surface inclined along the circumferential direction. Four guide grooves 223 extending in the front-rear direction are defined between the four first cam parts 221. Therefore, the outer cam 220 has four first cam parts 221 and four guide grooves 223. A regulating surface 224 is provided on the front end surface of the annular portion 221 a connected to the first cam portion 221 at the rear end of the guide groove 223 .

The above-described through hole 203a is formed in the rear end surface of the shaft cylinder 203 so that a knock cam 230, which will be described later, can be inserted therein. The annular portion 221a, which is the entrance portion of the through hole 203a, is formed to have a lower height from the inner circumferential surface of the shaft tube 203 than other portions. On the rear end surface of the first cam part 221, that is, on the surface of the annular part 221a, and at a position corresponding to the rear of the first cam surface 222, there is a fourth cam surface 225 inclined in the same direction as the first cam surface 222. is provided.

FIG. 23 is a perspective view of the knock cam 230 of the retractable writing instrument 200 of FIG. 19. In FIG. 23, the lower side is the front of the retractable writing instrument 200. A fitting portion 235 is provided at the rear of the knock cam 230 and fits into the end of the cap 209 to form a closed end. The knock cam 230 has four protruding second cam parts 231 that are arranged at equal intervals along the circumferential direction and extend in the front-rear direction. Each of the second cam parts 231 is disposed within the guide groove 223 of the outer cam 220 so as to be movable in the front-rear direction. A second cam surface 232 is provided on the front end surface of the second cam portion 231 . The second cam surface 232 is a surface inclined along the circumferential direction similarly to the first cam surface 222 and the fourth cam surface 225 of the outer cam 220. A first contact surface 233 is provided on a side surface of the second cam portion 231 in the circumferential direction. A locking surface 234 is provided on the rear end surface of the second cam portion 231 .

The second cam portion 231 is formed such that the circumscribed circle in the cross section of the second cam portion 231 is smaller than the inscribed circle in the cross section of the annular portion 221a of the outer cam 220. Therefore, as will be described later, when the cap 209 is fitted to the rear end portion of the shaft cylinder 203, the second cam portion 231 of the knock cam 230 is inserted into the guide groove 223 without interfering with the annular portion 221a of the outer cam 220. will be placed in

FIG. 24 is a perspective view of the rotor 240 of the retractable writing instrument 200 of FIG. 19. In FIG. 24, the lower side is the front of the retractable writing instrument 200. The rotor 240 has four third cam portions 241 arranged at equal intervals along the circumferential direction and extending in the front-rear direction. The four third cam parts 241 constitute an inner cam. Each of the third cam portions 241 is disposed within the guide groove 223 of the outer cam 220 so as to be movable in the front-rear direction. A cam receiving surface 242 is provided on the rear end surface of the third cam portion 241 . The cam receiving surface 242 is a surface that faces the first cam surface 222 of the outer cam 220 and the second cam surface 232 of the knock cam 230 and is similarly inclined along the circumferential direction. The rear end surface of the refill 5 biased by the spring 6 comes into contact with the front end surface of the rotor 240 . Therefore, the rotor 240 is always urged backward by the spring 6 via the refill 5. A second contact surface 243 is provided on a side surface of the third cam portion 241 in the circumferential direction.

FIG. 25 is a perspective view of the retractable mechanism 210 of the retractable writing instrument 200 of FIG. 19 in the writing state. In the writing state, as described above with reference to FIG. 9, the third cam portion 241 of the rotor 240 is engaged with the first cam portion 221 of the outer cam 220. At this time, the rotation of the rotor 240 is regulated by the rotor 240 contacting the knock cam 230 in the circumferential direction, specifically, by the second contact surface 243 contacting the first contact surface 233. , maintaining the written state.

FIG. 26 is a schematic diagram of the retractable mechanism 210 showing switching of the retractable writing instrument 200 of FIG. 19 from the non-writing state to the writing state. That is, FIG. 26 is a schematic diagram showing the positional relationship between the outer cam 220, the knock cam 230, and the rotor 240. The position of the third cam portion 241 of the rotor 240 is shown. In the figure, the lower side is the front of the retractable writing instrument 200, and the upper side is the rear of the retractable writing instrument 200. The rotor 240 is given a rotational force by the cooperation of the first cam surface 222 of the outer cam 220 or the second cam surface 232 of the knock cam 230 and the cam receiving surface 242 of the rotor 240, and rotates around the central axis. Rotate to one side. Therefore, the rotor 240 moves from right to left in FIG. 26 .

By the way, in the non-writing state, the cap 209 is fitted to the front end of the shaft tube 203. When the cap 209 is fitted to the front end of the barrel 203, the front end surface of the knock cam 230 is in contact with the front end surface of the barrel 203 (FIG. 19). By removing the cap 209 from the front end of the shaft cylinder 203 and completely fitting it to the rear end, the knock cam 230 is inserted into the interior through the through hole 203a of the shaft cylinder 203 and cooperates with the rotor 240. The non-writing state is switched to the writing state (FIG. 21). In FIG. 26, the description will be made sequentially starting from the state shown in FIG. 20 immediately after the cap 209 is disposed at the rear end portion of the shaft tube 203.

FIG. 26(A) is a schematic diagram of the projecting/retracting mechanism 210 in a non-writing state immediately after the cap 209 is disposed at the rear end portion of the shaft tube 203. In the non-writing state, the third cam portion 241 of the rotor 240, which is urged rearward by the spring 6 via the refill 5, is disposed at the rear within the guide groove 223 between the outer cams 220. The backward movement of the rotor 240 is regulated by the rear end of the third cam portion 241 being engaged with the regulating surface 224 of the outer cam 220 . Therefore, in this state, the writing section 4 is recessed into the shaft tube 203.

The cap 209 is casually placed on the rear end of the barrel 203 by the user. Therefore, the second cam portion 231 of the knock cam 230 may not be arranged at a position corresponding to the guide groove 223 of the outer cam 220. FIG. 26A shows a state in which the second cam portion 231 of the knock cam 230 is disposed at a position shifted from the guide groove 223 of the outer cam 220 in the circumferential direction.

When the cap 209 is pressed against the barrel 203 from the state shown in FIG. The cap 209 is rotated so that the cam portion 231 enters the guide groove 223. That is, the knock cam 230 pressed forward receives a component force in the circumferential direction from the fourth cam surface 225, and while the second cam surface 232 sequentially slides on the fourth cam surface 225 and the cam receiving surface 242, the knock cam 230 moves toward the center. Rotate around the axis. The second cam portion 231 of the knock cam 230 moves along the fourth cam surface 225 of the outer cam 220 and the cam receiving surface 242 of the rotor 240 until it comes into contact with the side surface of the first cam portion 221 of the outer cam 220. . Thereby, the second cam portion 231 of the knock cam 230 is arranged at the entrance of the guide groove 223 of the outer cam 220 (FIG. 26(B)).

From the state shown in FIG. 26(B), by pressing the cap 209 against the shaft cylinder 203 against the biasing force of the spring 6, the knock cam 230 and the rotor 240 are further advanced. At this time, the second cam portion 231 of the knock cam 230 and the third cam portion 241 of the rotor 240 move forward within the guide groove 223. Further, the knock cam 230 and the rotor 240 receive component forces in the circumferential direction in opposite directions through the slopes of the second cam surface 232 and the cam receiving surface 242, but the second cam portion 231 of the knock cam 230 or the rotation Movement in the circumferential direction, that is, rotation, is restricted by contact between the third cam portion 241 of the child 240 and the side surface of the first cam portion 221 of the outer cam 220.

When the knock cam 230 and the rotor 240 move further forward, the rear end of the third cam portion 241 of the rotor 240 crosses the front end of the outer cam 220, that is, the first cam portion 221 in the front-rear direction, and the first cam surface 222 and the second cam surface 232, and the restriction on the rotation of the rotor 240 by the outer cam 220 is released (FIG. 26(C)). As a result, the rotor 240 biased backward receives a component force in the circumferential direction from the second cam surface 232 and the first cam surface 222, and the cam receiving surface 242 pushes against the second cam surface 232 and the first cam surface 222. The rotor 240 rotates around the central axis while sliding in sequence (FIG. 26(D)).

The third cam portion 241 of the rotor 240 moves along the second cam surface 232 of the knock cam 230 and the first cam surface 222 of the outer cam 220 in this order until it comes into contact with the side surface of the second cam portion 231 of the knock cam 230. . That is, the rotation of the rotor 240 is stopped and regulated by the second contact surface 243 contacting the first contact surface 233 of the knock cam 230. At this time, the backward movement of the rotor 240, which is urged backward, is restricted by the engagement of the third cam part 241 with the first cam part 221 (FIG. 26(E)). In short, by engaging the rotor 240 with the outer cam 220, the state in which the writing part 4 of the refill 5 disposed in front of the rotor 240 protrudes from the barrel 203 is maintained, and the retractable writing instrument 200 is in the writing state. becomes. At this time, the second locking part 203c of the barrel 203 and the locked part 209a of the cap 209 fit and lock, so that the cap 209 is fitted to the rear end of the barrel 203. There is.

Note that although the spring 6 biases the rotor 240 rearward via the refill 5, in the writing state, the biasing force is supported only by the outer cam 220 as shown in FIG. 26(E). . Therefore, in the writing state, no force is applied to move the knock cam 230, that is, the cap 209 backward.

FIG. 27 is a schematic diagram of the retractable mechanism 210 showing switching of the retractable writing instrument 200 of FIG. 1 from the writing state to the non-writing state. In FIG. 27, the positional relationship between the outer cam 220, the knock cam 230, and the rotor 240 is shown in the same manner as in FIG. 26.

FIG. 27(A) is a schematic diagram of the retractable writing instrument 200 in the writing state, and is the same schematic diagram as FIG. 26(E). From the state shown in FIG. 27(A), the knock cam 230 is moved backward by grasping the cap 209 and removing it from the rear end of the barrel 203. When the knock cam 230 moves backward, the front end of the second cam part 231 of the knock cam 230 passes over the rear end of the rotor 240, that is, the third cam part 241 in the front-rear direction, and the first cam surface 222 and the second cam surface 232 match, and the restriction on the rotation of the rotor 240 by the knock cam 230 is released (FIG. 27(B)). As a result, the rotor 240, which is urged backward, receives a component force in the circumferential direction from the first cam surface 222, and the cam receiving surface 242 rotates while sliding on the first cam surface 222 and the second cam surface 232 in order. The child 240 further rotates around the central axis (FIG. 27(C)).

The third cam portion 241 of the rotor 240 moves along the first cam surface 222 of the outer cam 220 and the second cam surface 232 of the knock cam 230 until it comes into contact with the side surface of the first cam portion 221 of the outer cam 220. do. As a result, the rotation of the rotor 240 is stopped and regulated (FIG. 27(D). In this state, the rotor 240 is disengaged from the outer cam 220, so the biasing force of the spring 6 and The force of removing the cap 209 causes the rotor 240 and the knock cam 230 to retreat within the guide groove 223.The retreat of the rotor 240 is caused by the fact that the rear end of the third cam portion 241 engages with the regulating surface 224 of the outer cam 220. The cap 209 is removed (FIG. 27(E)).In short, by disengaging the rotor 240 from the outer cam 220, the writing portion 4 of the refill 5 disposed in front of the rotor 240 is removed. The retractable writing instrument 200 is maintained in a retracted state within the barrel 203 and enters a non-writing state.

As described above, in the retractable writing instrument 200, the knock cam 230 presses the rotor 240 as the rear end of the barrel 203 is inserted into the cap 209, causing the rotor 240 to move forward and rotate. is regulated by contact with the knock cam 230 in the circumferential direction, so that the rotor 240 engages with the outer cam 220 and enters the writing state. Specifically, in the retractable writing instrument 200, as the rear end of the barrel 203 is inserted into the cap 209, the second cam surface 232 presses the cam receiving surface 242, causing the rotor 240 to move forward and rotate. , the second contact surface 243 of the third cam portion 241 of the rotor 240 contacts the first contact surface 233 of the second cam portion 231 of the knock cam 230, and the rotation of the rotor 240 is restricted. ing.

Further, in the retractable writing instrument 200, the second cam surface 232 and the fourth cam surface 225 cooperate with each other as the rear end portion of the barrel 203 is inserted into the cap 209, and the second cam portion 231 is inserted into the guide groove 222. The cap 209 is configured to rotate the cap 209 so as to enter the cap 209 . In addition, in the retractable writing instrument 200, when the cap 209 is removed from the rear end of the barrel 103, the restriction on the rotation of the rotor 240 by the knock cam 230 is released, and the rotor 240 further rotates. The child 240 is configured to disengage from the outer cam 220 and enter a non-writing state. Further, in the retractable writing instrument 200, a second locking portion 203c is formed on the outer surface of the barrel 203, a locked portion 209a is formed on the inner surface of the cap 209, and the rear of the barrel 203 into the cap 209 is formed. The rotor 240 is configured to abut against the knock cam 230 in the circumferential direction when the second locking portion 203c and the locked portion 209a lock with each other as the end portion is inserted.

According to the third embodiment described above, a retractable writing instrument 200 including a novel retractable mechanism 210 can be provided. This prevents unintentional contact with the writing part and prevents contamination or injury.

That is, as described above with reference to FIG. 27, the retractable writing instrument 200 can be switched from the non-writing state to the writing state by fitting the cap 209 to the rear end of the barrel 203, and the cap 209 can be switched from the non-writing state to the writing state by fitting the cap 209 to the rear end of the barrel 203. By removing it from the rear end of 203, the writing state can be switched to the non-writing state. In other words, the state in which the writing portion 4 protrudes from the barrel 203 is maintained only while the cap 209 is fitted to the rear end portion of the barrel 203. Therefore, when writing is finished and the cap 209 is to be fitted into the front end of the barrel 203, the writing part 4 is always recessed into the barrel 203, so that the inside of the cap 209 is in the writing part. 4 and will not get dirty with ink. Also, when trying to fit the cap 209 to the front end of the barrel 203, you may accidentally touch the writing section 4, staining the ink with your hand, or getting injured by the sharp tip of the writing section 4. I never relax.

In the retractable writing instrument 200, it is necessary to fit the cap 209 to the rear end of the barrel 203 in order to write, so if you write with the cap 209 removed and placed on the desk, the cap 209 may be accidentally inserted. This also prevents the device from being dropped or lost from the desk. Furthermore, in the non-writing state where the cap 209 is fitted to the front end of the barrel 203, no internal parts protrude outward from the through hole 203a at the rear end of the barrel 203, and, for example, the rotor Since the rear end portion of 240 is located further forward than the rear end portion of the shaft tube 203, erroneous operation can be prevented and the design is excellent.

The retractable writing instrument 1, the retractable writing instrument 100, and the retractable writing instrument 200 all have an outer cam, a knock cam, and a rotor, and each has a first cam part, a second cam part, and a third cam part. . Although four of each of the first cam part, the second cam part, and the third cam part were provided, two, three, or five or more may be provided.

In the retractable writing instrument 1, all or a part of the operating section 7 or the clip 8 may be configured as an erasing member that erases handwriting made by the writing instrument. In the retractable writing instrument 100, all or a portion of the operating section 107 or the cover member 108 may be configured as an erasing member that erases handwriting made by the writing instrument. In the retractable writing instrument 200, all or part of the cap 209 (for example, the fitting portion 235 of the knock cam 230) may be configured as an erasing member that erases handwriting made by the writing instrument. The refill 5 may contain thermochromic ink. In this case, the writing instrument is a thermochromic writing instrument, and the handwriting of the writing instrument can be thermally discolored by the frictional heat generated when it is rubbed by the friction body that is the erasing member. Note that a ballpoint pen containing thermochromic ink, a mechanical pencil containing thermochromic lead, a pencil holder, etc. can also be used as the cursive writing material. Further, it may be a writing instrument containing eraser-erasable ink that can be erased with an eraser.

Here, thermochromic ink maintains a predetermined color (first color) at room temperature (e.g. 25°C) and changes to a different color (second color) when heated to a predetermined temperature (e.g. 60°C). This refers to ink that has the property of returning to its original color (first color) when it is cooled to a predetermined temperature (for example, -5° C.). In a writing instrument using thermochromic ink, the second color is colorless, and the process of heating a drawn line written in the first color (for example, red) to make it colorless is referred to as "erasing" here. Therefore, the friction body serving as the erasing section rubs against the writing surface or the like on which the drawn line has been written, generating frictional heat, thereby changing the drawn line to colorless, that is, erasing it. Note that, as a matter of course, the second color may be colored other than colorless.

200 Retractable writing instrument 203 Barrel 209 Cap 210 Retractable mechanism 220 Outer cam 221 First cam portion 222 First cam surface 223 Guide groove 224 Regulation surface 225 Fourth cam surface 230 Knock cam 231 Second cam portion 232 Second cam surface 233 1 contact surface 234 locking surface 235 fitting portion 240 rotor 241 third cam portion 242 cam receiving surface 243 second contact surface

Claims (5)

A shaft cylinder,
a cap that has a knock cam and can be fitted to the rear end of the barrel;
a rotor biased rearward within the shaft cylinder;
an outer cam provided on the inner surface of the shaft cylinder,
The knock cam and the outer cam are configured to cooperate with the rotor to rotate the rotor, and the rotor is in a writing state engaged with the outer cam and the rotor is engaged with the outer cam. A retractable writing instrument that can switch between a non-writing state and a non-writing state,
As the rear end of the barrel is inserted into the cap, the knock cam presses the rotor to advance and rotate the rotor, and the rotation of the rotor causes contact with the knock cam in the circumferential direction. A retractable writing instrument, characterized in that the rotor is regulated by contact so that the rotor engages with the outer cam and enters a writing state. The outer cam is defined between a plurality of first cam parts arranged along the circumferential direction on the inner surface of the shaft cylinder and having a first cam surface on a front end surface, and the plurality of first cam parts. and a plurality of guide grooves extending in the front-rear direction,
The knock cam has a second cam portion that is configured to be movable in the front-back direction within the guide groove and has a second cam surface on a front end surface,
The rotor has a third cam portion configured to be movable in the front-rear direction within the guide groove and having a cam receiving surface on a rear end surface that cooperates with the first cam surface and the second cam surface,
As the rear end of the shaft cylinder is inserted into the cap, the second cam surface presses the cam receiving surface to advance and rotate the rotor, and the third cam portion of the rotor The retractable writing instrument according to claim 1, wherein a side surface of the writing instrument is configured to abut against a side surface of the second cam portion of the knock cam to restrict rotation of the rotor. The first cam portion includes a fourth cam surface on the rear end surface, and as the rear end portion of the barrel is inserted into the cap, the second cam surface and the fourth cam surface cooperate, The retractable writing instrument according to claim 2, wherein the second cam portion is configured to rotate the cap so that it enters the guide groove. In the writing state, when the cap is removed from the rear end of the barrel, the rotation of the rotor is no longer restricted by the knock cam, and the rotor rotates, and the rotor engages with the outer cam. The retractable writing instrument according to claim 1, which is configured to be released and enter a non-writing state. A locking part is formed on the outer surface of the barrel, and a locked part is formed on the inner surface of the cap, and as the rear end of the barrel is inserted into the cap, the locking part and the The retractable writing instrument according to claim 1, wherein the rotor is configured to abut against the knock cam in the circumferential direction when the locked portion is locked.

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