JP2019202519A - Writing instrument - Google Patents

Abstract

To provide a writing instrument on which a rotary shutter mechanism is employed and in which the airtightness of a storage space of a nib when not writing is sufficiently improved.SOLUTION: A writing instrument 100 includes: a barrel 10 which has a barrel opening part 10a; a writing body 20 which is held inside the barrel 10; a rotary cylinder 30 which is provided inside the barrel 10 and has a rotary cylinder opening part 30a; a closing body 40 which is fixed on the barrel 10, has a closing body opening part 40a and can air-tightly close the rotary cylinder opening part 30a from the rear of the rotary cylinder 30. The closing body 40 has: the closing body opening part 40a whose phase around an axis line L is aligned with the barrel opening part 10a; and a closing part 44. Of the rotary cylinder 30, the phase around the axis line L of the rotary cylinder opening part 30a is aligned with the phase of the closing body opening part 40a when the writing body 20 is in a writing state, and the phase around the axis line L of the rotary cylinder opening part 30a is aligned with the phase of the closing part 44 of the closing body 40 when the writing body 20 is in a non-writing state.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a writing instrument capable of causing a writing body to appear and disappear from the front end of a shaft tube with a single operation by a knocking operation or the like.

  In general, a writing instrument such as a fountain pen includes a shaft tube, a writing body held by the shaft tube, a cap that is removably engaged with the shaft tube or the writing body and airtightly surrounds the front end (pen tip) of the writing body, have. At the time of writing, the cap is removed, the pen tip is exposed to the outside, and writing is performed. When the writing is completed, the cap is attached again to the shaft cylinder or the writing body, so that drying of the ink and damage to the pen tip are prevented.

  On the other hand, for example, as shown in Non-Patent Document 1, the applicant of the present application is provided with a writing instrument provided with a shutter mechanism capable of airtightly holding the space in the shaft cylinder in which the pen tip is accommodated at the front end of the shaft cylinder. Invented. As a result, it was possible to prevent ink drying and damage to the pen tip without using a cap. Furthermore, in addition to this shutter mechanism, the writing instrument of Non-Patent Document 1 pushes the writing body in the axial direction of the axial cylinder so that the axial cylinder causes the writing body to move relatively forward and to the non-rear side. A haunting mechanism is installed that can be held alternately in writing. With such a configuration, it is possible to provide a highly convenient writing instrument that can be switched between a writing state and a non-writing state by one touch (knock operation or rotation operation).

  In the writing instrument of Non-Patent Document 1, the opening / closing operation of the shutter mechanism is performed such that the front end of the writing instrument (for example, the pen tip of a fountain pen) directly pushes the shutter mechanism open. In this case, in the case of a writing instrument having a relatively large nib, the nib is caught by the shutter mechanism, and there is a possibility that a smooth opening / closing operation cannot be performed. For this problem, it is considered effective to increase the size of the shutter mechanism, but in this case, there is a concern that it is difficult to sufficiently secure the airtightness of the shutter mechanism. Furthermore, in the case of a writing instrument having a nib made of a soft material, there is a possibility that the pen nib may be damaged or the nib may be deformed when coming into contact with the shutter mechanism. In addition, there is a problem that design restrictions are increased.

  As a shutter system that can handle a relatively large nib, a rotary shutter mechanism as shown in Patent Document 1 is considered effective. The rotary shutter mechanism includes a plate-like shutter that is non-parallel to, preferably orthogonal to, the central axis of the shaft cylinder, and a rotation mechanism that rotates the shutter around the central axis of the shaft cylinder. In particular, the shutter mechanism of Patent Document 1 is configured to alternately switch permission / inhibition of the cursive body by rotating the shutter around the central axis in conjunction with the telescoping mechanism that causes the cursive body to project and retract. ing.

  In the writing instrument of Patent Document 1, a rotary operation type is adopted as the appearance mechanism. That is, when the operating body included in the retracting mechanism is rotated and the writing body is switched from the non-writing state to the writing state, the phase between the shutter through-hole and the opening provided at the front end of the shaft tube is the phase of the shaft tube. They are aligned around the axis, and the pen tip is exposed to the outside through these through holes and openings. On the other hand, when the writing body is switched from the writing state to the non-writing state, after the pen tip is stored inside the shaft tube, the shutter rotates around the central axis, and the shaft tube opening is closed by the shutter. However, in the shutter mechanism of Patent Document 1, it is considered difficult to seal the pen space containing the pen tip defined by the shutter and the shaft cylinder with sufficient airtightness in a non-writing state.

JP 2006-103333 A

Pilot “Capless” special site (searched on May 16, 2018) URL: http://pilot-capless.jp/

  The present invention has been made in view of the above problems. That is, an object of the present invention is to provide a writing instrument in which the airtightness of the pen-tip storage space is sufficiently enhanced during non-writing while employing a rotary shutter mechanism.

The writing instrument according to the first aspect of the present invention includes a shaft tube having a shaft tube opening at a front end;
A cursive body that is held in the axial cylinder so as to be relatively movable in the axial direction;
A rotating cylinder, which is disposed in the shaft cylinder so as to be relatively rotatable around the axis thereof, and has a rotating cylinder opening formed at the front end thereof;
A closed body fixed to the shaft cylinder and capable of airtightly closing the rotary cylinder opening from the rear of the rotary cylinder inside the rotary cylinder;
When the writing body is pushed forward with respect to the shaft cylinder to a predetermined position, the writing body is alternately held in a relatively front writing state and a relatively non-writing state behind the shaft cylinder,
The closing body includes a closing body opening in which a phase around the axis is aligned with the shaft tube opening of the shaft cylinder, and a closing portion provided in a phase different from the closing body opening. ,
When the writing body is in the writing state, the rotating cylinder has a phase around the axis of the rotating cylinder opening aligned with the phase of the closing body opening, and the writing body is in the non-writing state. The phase around the axis of the rotating cylinder opening is aligned with the phase of the closing part of the closing body, and the rotating cylinder opening is hermetically closed by the closing part.

The above writing instrument further includes an elastic body that urges the writing body from the front with respect to the shaft tube,
When the writing body is in the non-writing state, the closing portion of the closing body is pressed against the peripheral region of the opening of the rotating cylinder from behind by the elastic force of the elastic body. It can be closed airtight.

The cursive body has a protrusion on the side surface,
The closing body is cylindrical, has a guide hole extending in the axial direction on the side wall to guide the protrusion,
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the protruding portion, and includes a spiral groove or notch extending around the axis, and the spiral groove or notch An engaged portion including a linear groove or notch extending from the front end in the axial direction;
The protruding portion of the writing body may be engaged with the engaged portion of the rotating cylinder through the guide hole of the closing body.

  The closing body may include a first packing that surrounds an outer periphery of the closing portion and is pressed against a peripheral region of the rotary cylinder opening when the writing body is in the non-writing state.

The writing instrument according to the second aspect of the present invention includes a shaft cylinder having a shaft cylinder opening at a front end,
A cursive body that is held in the axial cylinder so as to be relatively movable in the axial direction;
A rotating cylinder, which is disposed in the shaft cylinder so as to be relatively rotatable around the axis thereof, and has a rotating cylinder opening formed at the front end thereof;
A closed body that is disposed within the shaft cylinder and capable of airtightly closing the rotating cylinder opening from the front of the rotating cylinder,
When the writing body is pushed forward with respect to the shaft cylinder to a predetermined position, the writing body is alternately held in a relatively front writing state and a relatively non-writing state behind the shaft cylinder,
The closing body includes a closing body opening in which a phase around the axis is aligned with the shaft tube opening of the shaft cylinder, and a closing portion provided in a phase different from the closing body opening. ,
When the writing body is in the writing state, the rotating cylinder has a phase around the axis of the rotating cylinder opening aligned with the phase of the closing body opening, and the writing body is in the non-writing state. The phase around the axis of the rotating cylinder opening is aligned with the phase of the closing part of the closing body, and the rotating cylinder opening is hermetically closed by the closing part.

The above writing instrument further includes biasing means for biasing the closing body from the front with respect to the shaft tube,
When the writing body is in the non-writing state, the closing portion of the closing body is pressed against the peripheral region of the opening of the rotating tube by the urging force of the urging means, so that the rotating tube opening is It may be closed airtight.

The cursive body has a protrusion on the side surface,
The shaft cylinder has a guide portion that extends in an axial direction on an inner surface to guide the protruding portion,
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the projecting portion, the spiral notch extending around the axis, and the axis from the front end of the spiral notch An engaged portion including a linear notch extending in the direction,
The projecting portion of the writing body may engage with the guide portion of the shaft tube through the engaged portion of the rotating tube.

The above writing instrument is further provided with an inner cylinder that is fixed to the shaft cylinder and disposed in a state of surrounding the writing body inside the rotating cylinder,
The cursive body has a protrusion on the side surface,
The inner cylinder has a guide hole that extends in the axial direction on the side wall and guides the protrusion.
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the protruding portion, and includes a spiral groove or notch extending around the axis, and the spiral groove or notch An engaged portion including a linear groove or notch extending from the front end in the axial direction;
The protruding portion of the writing body may be engaged with the engaged portion of the rotating cylinder through the guide hole of the inner cylinder.

  In the above writing instrument, the rotating cylinder opening of the rotating cylinder and the closing part of the closing body may be 180 degrees out of phase with respect to the axis.

  Moreover, the above writing instrument may further include a second packing that hermetically seals a gap between the outer surface of the rotating cylinder and the inner surface of the shaft cylinder.

  According to the present invention, it is possible to provide a writing instrument in which the airtightness of the pen space is sufficiently enhanced during non-writing while employing a rotary shutter mechanism.

It is a schematic longitudinal cross-sectional view which shows the writing instrument by the 1st Embodiment of this invention in a non-writing state. It is a schematic longitudinal cross-sectional view which shows the writing instrument by the 1st Embodiment of this invention in a writing state. It is a schematic perspective view which shows the closure body of the writing instrument of FIG. It is a schematic perspective view which shows the packing attached to the closure body of FIG. It is a schematic perspective view which shows the rotating cylinder of the writing instrument of FIG. It is a schematic perspective view which shows the holding body of the writing instrument of FIG. It is a figure for demonstrating an effect | action of the writing instrument of FIG. Fig.7 (a) is a schematic longitudinal cross-sectional view which shows the front part of a writing instrument when a writing body advances slightly, FIG.7 (b) and FIG.7 (c) are the closing body and rotary cylinder at that time It is a figure which shows the relative positional relationship with the protrusion part of a cursive body, respectively. It is a figure for demonstrating an effect | action of the writing instrument of FIG. FIG. 8A is a schematic longitudinal sectional view showing a front portion of the writing instrument in the middle of which the writing body is switched from the non-writing state to the writing state, and FIG. 8B and FIG. It is a figure which shows the relative positional relationship of the closing body and rotary cylinder of time, and the protrusion part of a writing body, respectively. It is a figure for demonstrating an effect | action of the writing instrument of FIG. Fig.9 (a) is a schematic longitudinal cross-sectional view which shows the front part of a writing instrument when a writing body is in a writing state, FIG.9 (b) and FIG.9 (c) are the closed body and rotary cylinder at that time It is a figure which shows the relative positional relationship with the protrusion part of a cursive body, respectively. It is a schematic longitudinal cross-sectional view which shows the front part of the writing instrument in the 2nd Embodiment of this invention. It is the schematic which shows the closure body of the writing instrument of FIG. Fig.11 (a) is a schematic front view of a closing body, and FIG.11 (b) is a schematic longitudinal cross-sectional view of a closing body.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal sectional view showing the writing instrument 100 according to the first embodiment of the present invention in a non-writing state, and FIG. 2 is a schematic longitudinal sectional view showing the writing instrument 100 in a writing state.

  As shown in FIGS. 1 and 2, the writing instrument 100 is relatively movable in the axial direction da within the axial tube 10 having the axial tube opening 10 a at the front end (left end in FIGS. 1 and 2) and the axial tube 10. The writing body 20 held on the shaft cylinder 10, the rotary cylinder 30 disposed in the shaft cylinder 10 so as to be relatively rotatable around the central axis L, and the closing body 40 fixed to the shaft cylinder 10. The closing body 40 has a cylindrical shape and is fixed to the shaft cylinder 10 so as to surround the front end portion of the writing body 20. Further, the rotary cylinder 30 is disposed in the shaft cylinder 10 in a state of surrounding the closing body 40.

  3 is a schematic perspective view showing the closing body 40 of the writing instrument 100 of FIG. 1, and FIG. 4 is a schematic perspective view showing the first packing 45 attached to the closing body 40 of FIG. FIG. 5 is a schematic perspective view showing the rotating cylinder 30 of the writing instrument 100 of FIG.

  As shown in FIG. 3, the closing body 40 is connected to the cylindrical closing body main body 41 connected to the shaft cylinder 10 and the front (left side in FIG. 3) of the closing body main body 41. A small-diameter cylindrical closing body small-diameter portion 42. The closing body main body 41 has a male threaded portion 43 at the rear end (the right end in FIG. 3), and the male threaded portion 43 and the female threaded portion 13 provided on the shaft tube 10 are screwed together to close the body. The body 40 is fixed to the shaft tube 10. Furthermore, the closing body main body 41 has two long holes extending in a direction parallel to the axial direction da on the side wall. These long holes are provided as guide holes 41g for guiding a protruding portion 24 of the writing body 20 to be described later. As shown in FIG. 3, the two guide holes 41 g have the same shape, and are formed with a phase shifted by 180 ° with respect to the central axis L of the closing body 40. When the closing body 40 is screwed to the shaft tube 10, the center axis thereof coincides with the center axis L (see FIG. 1) of the shaft tube 10. For this reason, the code | symbol L same as the center axis line of the axial cylinder 10 is used as a code | symbol which shows the center axis line of the closing body 40. FIG. The same applies to the central axis of the rotary cylinder 30 and the holding body 23 described later.

  As shown in FIG. 3, the closing body small diameter portion 42 of the closing body 40 has a closing portion 44 and a closing body opening 40a at the front end. The closing part 44 projects forward in a substantially half-moon shape, and closes a rotating cylinder opening 30a (see FIG. 5) of the rotating cylinder 30 described later from the rear. The first packing 45 shown in FIG. 4 is attached to the outer periphery of the closing portion 44 so that the rotary cylinder opening 30a is hermetically closed by the closing portion 44. Further, the closing body opening 40a is a through hole having a dimension through which the front end of the writing body 20, that is, the pen tip 21 of the fountain pen in the illustrated example, can pass, and the phase with the closing part 44 with respect to the central axis L is 180 °. It is off.

  Next, the rotating cylinder 30 will be described with reference to FIG. As shown in FIG. 5, the rotary cylinder 30 includes a rotary cylinder main body 31, a rotary cylinder small-diameter portion 32 that is connected to the front of the rotary cylinder main body 31 (leftward in FIG. 5) and has a smaller diameter than the rotary cylinder main body 31, have. The rotary cylinder main body 31 has an engaged portion 31e that is engaged with a protruding portion 24 of the writing body 20 described later. The engaged portion 31e includes a spiral notch 31e1 extending around the central axis L on the side wall of the rotary cylinder main body 31, and a rear end in a direction parallel to the axial direction da from the front end of the spiral notch 31e1. And a linear notch 31e2 that extends.

  Further, the rotating cylinder 30 has an annular groove 31g formed in front of the front end of the engaged portion 31e on the outer peripheral surface of the rotating cylinder main body 31. A second packing 51 (see FIGS. 1 and 2) is assembled in the annular groove 31g. The second packing 51 tightly seals the gap between the outer surface of the rotating cylinder 30 and the inner surface of the shaft cylinder 10 by tightly contacting the annular groove 31g of the rotating cylinder 30 and the inner surface of the shaft cylinder 10. ing. Due to the presence of the second packing 51, the first packing 45 described above, and the packing (not shown) disposed inside the rear of the shaft tube 10, the internal space of the closing body 40 is kept airtight in a non-writing state. Will be. As an example, the first packing 45 and the second packing 51 are made of a material having elasticity such as nitrile rubber or silicon rubber, or a material capable of obtaining elasticity by reducing the thickness, such as fluororesin or polyacetal resin. The cross-sectional shape and outer shape are not limited.

  Returning to FIGS. 1 and 2, the shaft cylinder 10 has a first contraction having an inner diameter smaller than the outer diameter of the rotating cylinder body 31 at a position in front of the rotating cylinder body 31, that is, a position facing the rotating cylinder small diameter portion 32. It has a diameter portion 11. Further, the shaft cylinder 10 has a second reduced diameter portion 12 having an inner diameter smaller than the outer diameter of the rotating cylinder body 31 behind the rotating cylinder body 31. The separation distance between the first reduced diameter portion 11 and the second reduced diameter portion 12 is slightly larger than the length of the rotary cylinder main body 31 (dimension along the axial direction da). With such a configuration, the rotating cylinder 30 is allowed to move slightly along the axial direction da of the shaft cylinder 10 in addition to the relative rotation around the axis L with respect to the shaft cylinder 10.

  Next, as shown in FIGS. 1 and 2, the writing body 20 includes a writing body main body 22 including a pen tip 21, and a holding body 23 that holds the writing body main body 22 and moves integrally. ing. As described above, in FIG. 1 and FIG. 2, the writing body 20 is illustrated as a fountain pen, but is not limited thereto, and may be various writing bodies such as a ballpoint pen, a sign pen, and a fluorescent pen.

  Next, FIG. 6 is a schematic perspective view showing the holding body 23 of the writing body 20 of the writing instrument 100 of FIG. As shown in FIG. 6, the holding body 23 has a cylindrical shape that defines an accommodation space in which the writing body main body 22 is accommodated. The holder 23 receives an operation from the outside of the shaft tube 10 directly or indirectly, and moves relative to the shaft tube 10 together with the writing body 22 in a direction parallel to the axial direction da. ing.

  For example, in the case where the writing instrument 100 has a knock-type protruding and retracting mechanism, the rear end of the holding body 23 may protrude rearward from the shaft tube 10. Then, when the rear end portion of the holding body 23 is pushed by a predetermined amount from the rear side of the shaft tube 10, the writing body 20 is relatively behind the front writing state (see FIG. 1) by the shaft tube 10. It is held alternately with the non-writing state (see FIG. 2). Alternatively, when the writing instrument 100 has a rotary type retracting mechanism, the writing body 20 is moved forward with respect to the shaft tube 10 by rotating the rotating operation body (not shown) held in the shaft tube 10 so as to be relatively rotatable. A predetermined amount is pushed in. By this rotation operation, the writing body 20 is held alternately in the writing state and the non-writing state by the shaft tube 10. Since a known mechanism can be adopted for the knock-type in / out mechanism and the rotary operation type in / out mechanism, detailed description thereof is omitted here.

  As shown in FIG. 6, the holding body 23 has a protruding portion 24 on the outer surface. The protrusions 24 of the present embodiment are provided at two locations in the vicinity of the front end (left end in FIG. 6) of the holding body 23, and are symmetrical with respect to the center axis L, that is, have a phase around the center axis L. They are arranged 180 degrees apart. These protrusions 24 pass through the guide holes 41g of the closing body 40 and engage with the engaged portions 31e of the rotary cylinder 30 (see FIGS. 1 and 2). Further, as shown in FIG. 6, the outer surface of the holder 23 has a holder-side receiving portion 25 that protrudes radially outward.

  The writing instrument 100 further includes an elastic body 60 that urges the writing body 20 from the front with respect to the shaft tube 10. As shown in FIGS. 1 and 2, the shaft tube 10 has a shaft tube side receiving portion 14 protruding inward in the radial direction in front of the holding body side receiving portion 25 of the holding body 23. And the elastic body 60 is arrange | positioned in the compression state between the axial cylinder side receiving part 14 and the holding body side receiving part 25. As shown in FIG. The elastic body 60 is, for example, a coil spring. Due to the action of the elastic body 60, the writing body 20 is always urged backward with respect to the shaft tube 10.

  Next, the operation of the writing instrument 100 will be described with reference to FIGS.

  Fig.7 (a) is a schematic longitudinal cross-sectional view which shows the front part of the writing instrument 100 when the writing body 20 advances slightly, FIG.7 (b) and FIG.7 (c) are the closure bodies 40 at that time. 3 is a diagram showing a relative positional relationship between the rotating cylinder 30 and the protruding portion 24 of the writing body 20. FIG. 8A is a schematic longitudinal sectional view showing a front portion of the writing instrument 100 while the writing body 20 is being switched from the non-writing state to the writing state, and FIG. 8B and FIG. FIG. 4 is a diagram showing a relative positional relationship between the closing body 40 and the rotating cylinder 30 at that time and the protruding portion 24 of the writing body 20. Fig.9 (a) is a schematic longitudinal cross-sectional view which shows the front part of the writing instrument 100 when the writing body 20 exists in a writing state, FIG.9 (b) and FIG.9 (c) are the closure bodies 40 at that time 3 is a diagram showing a relative positional relationship between the rotating cylinder 30 and the protruding portion 24 of the writing body 20. In order to facilitate understanding, the rotary cylinder 30 is shown in a developed view in each drawing.

  Hereinafter, the non-writing state shown in FIG. 1 will be described as an initial state. As shown in FIG. 1, in the initial state, the protruding portion 24 of the holding body 23 abuts on the rear end (right end in FIG. 1) of the engaged portion 31e of the rotary cylinder 30, and attaches the rotary cylinder 30 to the rear. It is fast. With this urging force, the rotating cylinder 30 is pressed against the closing body 40 from the front, and the rotating cylinder opening 30 a is airtightly closed by the closing portion 44 including the first packing 45. Further, the shutter portion 30 s of the rotary cylinder 30 completely covers the closing body opening 40 a of the closing body 40.

  In this state, the user performs a predetermined operation on the retracting mechanism of the writing instrument 100, and the writing body 20 is slightly advanced relative to the shaft tube 10 while compressing the elastic body 60. Since the protruding portion 24 of the holding body 23 is guided by the guide hole 41 g of the closing body 40 fixed to the shaft cylinder 10, the writing body 20 does not rotate relative to the shaft cylinder 10. Thereby, the rotating cylinder 30 is slightly advanced by the holding body 23 with respect to the shaft cylinder 10. This forward movement is terminated when the rotary cylinder 30 comes into contact with the first reduced diameter portion 11 of the shaft cylinder 10 from behind and further advancement is prohibited. On the other hand, since the closing body 40 is fixed to the shaft tube 10, it does not move relative to the shaft tube 10. As a result, the rotating cylinder 30 moves forward relative to the closing body 40, and the state where the rotating cylinder opening 30a is hermetically closed by the closing portion 44 is released.

  By the way, the protrusion part 24 is engaged with the helical notch part 31e1. For this reason, when the writing body 20 moves forward with respect to the shaft tube 10, the rotating tube 30 has both a force for moving the rotating tube 30 forward by the protrusion 24 and a force for rotating the rotating tube 30 around the central axis L. Works. However, since the rotating cylinder opening 30a of the rotating cylinder 30 is fitted in the closing part 44 of the closing body 40 in the initial state, until the fitting state with the closing part 44 is released, the shaft cylinder 10 and Relative rotation around the central axis L with respect to the closing body 40 is restricted.

  When the writing body 20 is further advanced from the state shown in FIG. 7, further advancement of the rotary cylinder 30 is restricted. Therefore, the writing body 20 compresses the elastic body 60, and the rotary cylinder 30 is the shaft cylinder. While relatively rotating around the central axis L with respect to 10, relative movement forward relative to the barrel 10. The relative rotation of the rotary cylinder 30 continues until the protrusion 24 reaches the front end of the spiral notch 31e1, that is, the rear end of the linear notch 31e2.

  When the protruding portion 24 of the holding body 23 reaches the front end of the spiral cutout portion 31e1, the rotary cylinder 30 is rotated by 180 ° around the central axis L from the initial state as shown in FIG. As a result, as shown in FIG. 8A, the phase of the rotary cylinder opening 30a around the central axis L is equal to each phase of the closing body opening 40a of the closing body 40 and the shaft cylinder opening 10a of the shaft cylinder 10. Aligned. At this time, the writing body 20 is advanced until the position of the front end of the pen tip 21 is substantially the same position as the front end of the closing body 40.

  When the writing body 20 is further advanced from this state against the urging force of the elastic body 60, the projecting portion 24 is guided by the guide hole 41 g of the closing body 40, and the linear notch portion of the rotating cylinder 30. Advance 31e2. For this reason, while the writing body 20 advances with respect to the axial cylinder 10, the rotary cylinder 30 maintains the same phase around the central axis L. As the projecting portion 24 advances through the linear notch 31e2 of the rotary cylinder 30, the pen tip 21 of the writing body 20 passes through the closing body 40, the rotary cylinder 30, and the openings 40a, 30a, and 10a of the shaft cylinder 10 in order. It penetrates and is exposed forward from the shaft cylinder 10 (see FIG. 9). At this time, the writing body 20 is held so as not to retreat with respect to the shaft tube 10 by an unillustrated unillustrated mechanism, thereby realizing a writing state (see FIG. 2). With the above operation, the writing preparation of the writing instrument 100 is completed. Thereafter, writing is performed as desired by the user.

  When the writing is completed, the user performs a predetermined operation on the appearance mechanism of the writing instrument 100, and the writing body 20 starts to move backward with respect to the shaft tube 10. By this backward movement, the writing instrument 100 is returned to the initial state by following the reverse order of the process when switching from the non-writing state to the writing state. That is, while the protrusion 24 is guided by the guide hole 41g of the closing body 40, the linear notch 31e2 of the rotary cylinder 30 is moved to the rear end, and the pen tip 21 of the writing body 20 is moved into the shaft cylinder 10. Stored (see FIG. 8). When the writing body 20 is further retracted from the shaft cylinder 10 from this state, the projecting portion 24 is guided by the guide hole 41g of the closing body 40, and the spiral cutout portion 31e1 of the rotating cylinder 30 is extended to the rear end. Moving. In this process, the rotary cylinder 30 is rotated backward 180 ° around the central axis L. As a result, the phase around the central axis L of the rotating cylinder opening 30a is aligned with the phase of the closing body opening 40a of the closing body 40, and the shutter 30s completely covers the closing body opening 40a of the closing body 40. (See FIG. 7).

  When the writing instrument 100 is switched from the non-writing state to the writing state, the rotary cylinder 30 is pressed against the first reduced diameter portion 11 of the shaft cylinder 10 from the rear side with respect to the shaft cylinder 10 and the closing body 40. Relative rotation about the central axis L. In addition, when the writing instrument 100 is switched from the writing state to the non-writing state, the rotary cylinder 30 is configured so that the rear surface of the shutter part 30s is pressed against the closing part 44 of the closing body 40 from the front, and the shaft cylinder 10 and the closing body. Rotate relative to 40 around the central axis. That is, in any of these cases, the first packing 45 and the rotary cylinder 30 do not come into contact when the rotary cylinder 30 rotates relative to the shaft cylinder 10 and the closing body 40. Thereby, the wear of the first packing 45 is effectively suppressed.

  When the writing body 20 is further retracted from the shaft cylinder 10 from this state, the rotary cylinder 30 is pressed against the closing body 40 from the front. That is, the rotating cylinder opening 30 a of the rotating cylinder 30 is airtightly closed by the closing portion 44 of the closing body 40. Thereby, the initial state shown in FIG. 1 is restored. In the above-described process in which the writing body 20 is switched from the writing state to the non-writing state, when the initial operation is performed by the user, a series of subsequent operations are spontaneously realized by the elastic force of the elastic body 60. That is, the writing instrument 100 can be returned to the initial state by a one-touch operation.

  In the initial state (non-writing state) shown in FIG. 1, the first packing 45 is brought into close contact with the peripheral region of the rotating cylinder opening 30 a of the rotating cylinder 30. For this reason, the passage of air through the gap between the rotating cylinder opening 30a and the closing portion 44 is prohibited. Further, the second packing 51 is always in close contact with the rotary cylinder 30 and the inner surface of the shaft cylinder 10 in the process of switching from the non-writing state to the writing state. For this reason, the passage of air through the gap between the rotating cylinder 30 and the shaft cylinder 10 is prohibited. That is, in the non-writing state, air may flow between the inside of the closing body 40 and the outside of the shaft tube 10 through the engaged portion 31e of the rotating cylinder 30 and the guide hole 41g of the closing body 40. prohibited. In short, in the non-writing state, the airtightness of the internal space of the closing body 40 in which the pen tip 21 of the writing body 20 is accommodated is ensured.

  According to the present embodiment as described above, in particular, the rotary cylinder opening 30a of the rotary cylinder 30 is airtightly closed by the closing body 40, thereby adopting a rotary shutter mechanism, and at the time of non-writing. The writing instrument 100 in which the airtightness of the accommodation space of the nib 21 is sufficiently enhanced can be provided.

  In particular, the writing instrument 100 includes an elastic body 60 that urges the writing body 20 from the front with respect to the shaft tube 10, and when the writing body 20 is in a non-writing state, the elastic body 60 repels the closure body 40. The closing part 44 is pressed against the peripheral area of the rotary cylinder opening 30a from the rear. As a result, the rotary cylinder opening 30a can be closed with high airtightness.

  Further, since the protruding portion 24 of the writing body 20 penetrates the guide hole 41g of the closing body 40 and engages with the engaged portion 31e of the rotating cylinder 30, the rotary shutter mechanism can be operated reliably. .

  The closing body 40 has a first packing 45 that surrounds the outer periphery of the closing portion 44 and is pressed against the peripheral area of the rotary cylinder opening 30a when the writing body 20 is in a non-writing state. Thus, the closing body 40 can close the rotary cylinder opening 30a with better airtightness when not writing.

  Further, since the writing instrument 100 has the second packing 51 that hermetically seals the gap between the outer surface of the rotary cylinder 30 and the inner surface of the shaft cylinder 10, the airtightness of the accommodation space of the pen tip 21 is ensured when not writing. Can be secured.

  As the first packing 45 and the second packing 51, for example, a material having elasticity such as nitrile rubber or silicon rubber, or a material capable of obtaining elasticity by reducing the wall thickness such as fluororesin or polyacetal resin is used. The cross-sectional shape and outer shape are not limited. For this reason, the freedom degree of selection of a sealing member is high.

  Next, a writing instrument 200 according to the second embodiment of the present invention will be described.

  FIG. 10 is a schematic longitudinal sectional view showing a front portion of the writing instrument 200 according to the second embodiment of the present invention. However, although the illustration of the cursive body 20 is omitted in FIG. 10, the configuration is the same as that of the first embodiment. As shown in FIG. 10, the writing instrument 200 is different from the writing instrument 100 according to the first embodiment in that a closing body 240 is disposed in front of the rotating cylinder 230.

  FIG. 11 is a schematic view showing the closing body 240 of the writing instrument 200 of FIG. FIG. 11A is a schematic front view of the closing body 240, and FIG. 11B is a schematic vertical sectional view of the closing body 240. As shown in FIG. 11, the closing body 240 has a bottomed cylindrical shape. A closing body opening 240 a is formed at the bottom of the closing body 240. Moreover, the area | region in which the closing body opening part 240a is not formed among the bottom parts of the closing body 240 becomes the closing part 244 for closing the rotation cylinder opening part 230a of the rotation cylinder 230 mentioned later. As shown in FIG. 11, the closing body opening 240 a of the present embodiment is also a through-hole having a dimension that allows the front end of the writing body 20, for example, the pen tip 21 of the fountain pen, to pass therethrough. It is formed at a position that is 180 ° out of phase with 244.

  As shown in FIG. 11A, the closed body 240 has a non-circular contour when viewed from the front (viewed from the direction of the central axis L of the shaft tube 210). In the example shown in the figure, the four locations on the top, bottom, left, and right in FIG. 11A have flat contour lines. Further, although not shown in detail, the inner surface of the shaft cylinder 210 corresponds to the contour line of the closing body 240 in which the cross-sectional contour line of the portion facing the portion having the flat contour line of the closing member 240 corresponds to the contour line of the closing member 240. And is flat. With such a configuration, the closing body 240 is prohibited from rotating around the central axis L with respect to the shaft tube 210 when the closing body 240 is disposed in the shaft tube 210. Of course, as long as the relative rotation around the central axis L of the closing body 240 with respect to the shaft cylinder 210 can be restricted, the embodiment is not limited to such a mode.

  Returning to FIG. 10, the closing body 240 has a direction in which the bottom part faces the rotary cylinder 230, and the phase around the central axis L of the closing body opening 240 a is aligned with the phase of the axial cylinder opening 210 a. It is arranged in the cylinder 210. As shown in FIG. 10, an urging means 270 is disposed between the closing body 240 and the front end portion of the shaft tube 210. The biasing means 270 is a coil spring arranged in a compressed state. Due to the urging force of the urging means 270, the closing body 240 is pressed against the rotating cylinder 230 from the front.

  Furthermore, in the present embodiment, since the closing body 240 is provided in front of the rotary cylinder 230, the components corresponding to the guide holes 41g (see FIG. 3) in the first embodiment are the closing body. It is provided in the shaft cylinder 210 instead of 240. That is, the shaft cylinder 210 has a guide portion that extends in a direction parallel to the axial direction L of the shaft cylinder 210 and guides the protruding portion 24 of the writing body 20 on the inner surface. Specifically, the guide portion is a linear guide groove 210g formed along the axial direction da on the inner peripheral surface of the shaft tube 210.

  Next, the rotating cylinder 230 has a rotating cylinder opening 230a formed at the front end. The rotating cylinder opening 230a has substantially the same dimensions as the closing body opening 240a of the closing body 240. Of the front end portion of the rotating cylinder 230, an area other than the area where the rotating cylinder opening 230a is formed is a closed shutter portion 230s. The shutter part 230s is configured to have a size capable of completely covering the closing body opening 240a of the closing body 240 from the rear. Although not shown, at least one of the surface on the rotating cylinder 230 side in the closing portion 244 of the closing body 240 and the surface on the closing body 240 side in the peripheral region of the rotating cylinder opening 230 a of the rotating cylinder 230. On this surface, a coating layer (not shown) is provided for ensuring airtightness when the closing portion 244 covers the rotary cylinder opening 230a.

  Further, a packing 251 is attached to the inner surface of the shaft cylinder 210 for airtightly closing and sliding the gap between the inner surface of the shaft cylinder 210 and the outer surface of the rotating cylinder 230. Further, since the rotating cylinder 230 is prohibited from moving forward with respect to the shaft cylinder 210 by the presence of the closing body 240, the shaft cylinder 210 includes the first reduced diameter portion (see FIG. 1 and reference numeral 11 in FIG. 2) is not provided. Other configurations are substantially the same as those of the writing instrument 100 according to the first embodiment. For this reason, in FIG. 10, the same code | symbol is attached | subjected to the component which is common in the writing instrument 100 by 1st Embodiment, and the detailed description is abbreviate | omitted here.

  The operation of the writing instrument 200 as described above is roughly the same as that of the writing instrument 100 according to the first embodiment, but the protruding portion 24 of the writing body 20 is not a guide hole (reference numeral 41g in FIG. 3), but a shaft cylinder. It can be understood by being read as being guided by the guide groove 210g of 210. However, in the present embodiment, in the non-writing state, the rotating cylinder opening 230a is closed by the coating layer provided on at least one of the surface regions that contact each other out of the closing body 240 and the rotating cylinder 230. At the time of closing, the closing body 240 is pressed against the rotating cylinder 230 by the urging force of the urging means 270, so that airtightness between the closing body 240 and the rotating cylinder opening 230a of the rotating cylinder 230 is ensured. The For this reason, when the non-writing state and the writing state are switched, the rotary cylinder 230 is not moved relative to the axial cylinder 210 in the axial direction da.

  According to the present embodiment as described above, the rotating cylinder opening 230a of the rotating cylinder 230 is airtightly closed by the closing portion 244 of the closing body 240, thereby adopting a rotary shutter mechanism. It is possible to provide the writing instrument 200 in which the airtightness of the accommodation space of the nib 21 at the time of non-writing is sufficiently enhanced.

  In particular, the writing instrument 200 includes urging means 270 that urges the closing body 240 from the front with respect to the shaft tube 10, and when the writing body 20 is in a non-writing state, the closing body 240 is urged by the urging force of the urging means 270. The closed portion 244 is pressed against the peripheral region of the rotary cylinder opening 230a from the rear. As a result, the rotary cylinder opening 230a can be closed with high airtightness.

  Further, since the protruding portion 24 of the writing body 20 penetrates the engaged portion 230e1 of the rotating cylinder 230 and engages with the guide groove 210g of the shaft cylinder 210, the rotary shutter mechanism can be operated reliably. .

  Further, the rotating cylinder opening 230 a of the rotating cylinder 230 and the closing portion 244 of the closing body 240 are 180 degrees out of phase about the central axis L. For this reason, each of the rotating cylinder opening 230a and the shutter 230s can be sized to the maximum size.

  As the packing 251, for example, a material having elasticity such as nitrile rubber or silicon rubber, or a material that can obtain elasticity by reducing the thickness such as fluororesin or polyacetal resin is used. Is not limited. For this reason, the freedom degree of selection of a sealing member is high.

  In the second embodiment described above, the protruding portion 24 of the writing body 20 has been described as being guided by the guide groove 210g formed on the inner surface of the shaft tube 210. Not limited. That is, as a modified example of the writing instrument 200, a writing instrument having an inner cylinder that is fixed to the shaft cylinder 10, is disposed in a state of surrounding the writing body 20 inside the rotating cylinder 230, and has a front end opened. The inner cylinder has a guide hole that extends in a direction parallel to the axial direction da of the shaft cylinder 210 and guides the protruding portion 24 on the side wall. In this case, the protruding portion 24 of the writing body 20 may be engaged with the engaged portion 231e of the rotating cylinder 230 through the guide hole of the inner cylinder. After all, it can be said that the writing instrument according to the present modification is obtained by opening the front end portion of the closing body 40 in the writing instrument 100 according to the first embodiment. Therefore, when the writing state and the non-writing state are switched in the writing instrument according to the present modification, the interaction between the inner cylinder, the rotating cylinder 230 and the protruding portion 24 is the closing body 40 of the writing instrument 100 according to the first embodiment. This is common with the interaction between the rotating cylinder 30 and the protrusion 24.

  According to such a configuration, the same operational effects as the writing instrument 200 according to the second embodiment can be achieved without providing the guide groove 210g on the inner peripheral surface of the shaft cylinder 210.

DESCRIPTION OF SYMBOLS 10 Shaft cylinder 10a Shaft cylinder opening part 11 1st reduced diameter part 12 2nd reduced diameter part 13 Female screw part 14 Shaft cylinder side receiving part 20 Writing body 21 Pen tip 22 Writing body main body 23 Holding body 24 Protruding part 25 Holding body side receiving Part 30 Rotating cylinder 30a Rotating cylinder opening 30s Shutter part 31 Rotating cylinder main body 31e Engaged part 31e1 Helical notch 31e2 Linear notch 31g Annular groove 32 Rotating cylinder small diameter part 40 Closing body 40a Closing body Opening portion 41 Closure body main body 41g Guide hole 42 Closure body small diameter portion 43 Male screw portion 44 Closure portion 45 First packing 51 Second packing 60 Elastic body 100 Writing tool 200 Writing tool 210 Shaft cylinder 210a Shaft cylinder opening 210g Guide groove 230 Rotating cylinder 230a Rotating tube opening

Claims (10)

A shaft tube having a shaft tube opening at the front end;
A cursive body that is held in the axial cylinder so as to be relatively movable in the axial direction;
A rotating cylinder, which is disposed in the shaft cylinder so as to be relatively rotatable around the axis thereof, and has a rotating cylinder opening formed at the front end thereof;
A closed body fixed to the shaft cylinder and capable of airtightly closing the rotary cylinder opening from the rear of the rotary cylinder inside the rotary cylinder;
When the writing body is pushed forward with respect to the shaft cylinder to a predetermined position, the writing body is alternately held in a relatively front writing state and a relatively non-writing state behind the shaft cylinder,
The closing body includes a closing body opening in which a phase around the axis is aligned with the shaft tube opening of the shaft cylinder, and a closing portion provided in a phase different from the closing body opening. ,
When the writing body is in the writing state, the rotating cylinder has a phase around the axis of the rotating cylinder opening aligned with the phase of the closing body opening, and the writing body is in the non-writing state. A writing instrument in which a phase around the axis of the rotating cylinder opening is aligned with a phase of the closing part of the closing body, and the rotating cylinder opening is hermetically closed by the closing part. An elastic body for urging the writing body from the front with respect to the shaft;
When the writing body is in the non-writing state, the closing portion of the closing body is pressed against the peripheral region of the opening of the rotating cylinder from behind by the elastic force of the elastic body. The writing instrument according to claim 1, which is hermetically closed. The cursive body has a protrusion on the side surface,
The closing body is cylindrical, has a guide hole extending in the axial direction on the side wall to guide the protrusion,
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the protruding portion, and includes a spiral groove or notch extending around the axis, and the spiral groove or notch An engaged portion including a linear groove or notch extending from the front end in the axial direction;
The writing instrument according to claim 1, wherein the protruding portion of the writing body is engaged with the engaged portion of the rotating cylinder through the guide hole of the closing body.   The said closing body has the 1st packing which surrounds the outer periphery of the said closing part, and is pressed against the peripheral area | region of the said rotation cylinder opening part when the said writing body is the said non-writing state. Writing instrument as described in any one of Claims. A shaft tube having a shaft tube opening at the front end;
A cursive body that is held in the axial cylinder so as to be relatively movable in the axial direction;
A rotating cylinder, which is disposed in the shaft cylinder so as to be relatively rotatable around the axis thereof, and has a rotating cylinder opening formed at the front end thereof;
A closed body that is disposed within the shaft cylinder and capable of airtightly closing the rotating cylinder opening from the front of the rotating cylinder,
When the writing body is pushed forward with respect to the shaft cylinder to a predetermined position, the writing body is alternately held in a relatively front writing state and a relatively non-writing state behind the shaft cylinder,
The closing body includes a closing body opening in which a phase around the axis is aligned with the shaft tube opening of the shaft cylinder, and a closing portion provided in a phase different from the closing body opening. ,
When the writing body is in the writing state, the rotating cylinder has a phase around the axis of the rotating cylinder opening aligned with the phase of the closing body opening, and the writing body is in the non-writing state. A writing instrument in which a phase around the axis of the rotating cylinder opening is aligned with a phase of the closing part of the closing body, and the rotating cylinder opening is hermetically closed by the closing part. A biasing means for biasing the closing body from the front with respect to the shaft;
When the writing body is in the non-writing state, the closing portion of the closing body is pressed against the peripheral region of the opening of the rotating tube by the urging force of the urging means, so that the rotating tube opening is 6. The writing instrument according to claim 5, which is hermetically closed. The cursive body has a protrusion on the side surface,
The shaft cylinder has a guide portion that extends in an axial direction on an inner surface to guide the protruding portion,
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the projecting portion, the spiral notch extending around the axis, and the axis from the front end of the spiral notch An engaged portion including a linear notch extending in the direction,
The writing instrument according to claim 5 or 6, wherein the protruding portion of the writing body is engaged with the guide portion of the shaft tube through the engaged portion of the rotating tube. An inner cylinder fixed to the shaft cylinder and disposed in a state surrounding the cursive body inside the rotary cylinder;
The cursive body has a protrusion on the side surface,
The inner cylinder has a guide hole that extends in the axial direction on the side wall and guides the protrusion.
The rotating cylinder is an engaged portion that is provided on a side wall and is engaged with the protruding portion, and includes a spiral groove or notch extending around the axis, and the spiral groove or notch An engaged portion including a linear groove or notch extending from the front end in the axial direction;
The writing instrument according to claim 5 or 6, wherein the protruding portion of the writing body is engaged with the engaged portion of the rotating cylinder through the guide hole of the inner cylinder.   The writing instrument according to any one of claims 1 to 8, wherein the rotating cylinder opening of the rotating cylinder and the closing part of the closing body are 180 degrees out of phase with respect to the axis.   The writing instrument according to any one of claims 1 to 9, further comprising a second packing that hermetically seals a gap between an outer surface of the rotating cylinder and an inner surface of the shaft cylinder.