JP2023030746A - Retractable writing instrument - Google Patents

Abstract

To prevent the advancing and retreating core from interfering with the surrounding part.SOLUTION: There is provided a retractable writing utensil comprising a barrel 10 and a core 30 housed in the barrel 10, in which the core 30 retracts from the front end of the barrel 10. The core 30 includes a writing portion 30a on the front end side, a cover member 34 that covers the writing portion 30a in a cylindrical shape and advances and retreats so that the writing portion 30a retracts, and a cover support portion 33b that supports the cover member 34 from the inside so as to be able to advance and retreat. The cover support portion 33b is provided with an engaging protrusion 33b1 protruding outward in the radial direction of the barrel. The cover member 34 is provided with a penetrating guide hole 34a through which the engaging protrusion 33b1 is inserted so as to be advanced and retracted. The inner edge at the front end or the inner edge at the rear end of the guide hole 34a has inclined edge portions 34a1 and 34a2 inclined with respect to the circumferential direction of the barrel.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a retractable writing instrument in which a core housed in a barrel is retractable at the front end of the barrel.

Conventionally, in this type of invention, for example, as described in Patent Document 1, the front end side of a core for a marker pen that appears and disappears at the front end of the barrel cylinder covers the writing part in a cylindrical shape and advances and retreats. There is a retractable writing instrument provided with a cover member for retracting the writing part.
In this retractable writing instrument, when the center core for the marker pen is advanced to pass through the opening at the front end of the barrel, the cover member is caused to interfere with the inner peripheral surface of the barrel and is relatively retracted, so that the writing portion is retracted. It is designed to be exposed, and by doing so, there are effects such as not staining the front end of the barrel.

JP 2020-179623 A

However, according to the above-described prior art, the through-shaped guide hole provided in the peripheral wall of the cover member does not move around the surrounding parts (for example, the writing part of a ballpoint pen refill, or the connection between the barrel and the tip) when the core as a whole advances and retracts. stepped portion, etc.) may interfere with each other, resulting in malfunction. In particular, if the writing part of the ballpoint pen refill gets into the guide hole, there is a high possibility that it will malfunction.

In view of such problems, the present invention comprises the following configurations.
A retractable type writing instrument comprising a barrel and a core accommodated in the barrel, wherein the core is projected and retracted from the front end of the barrel, wherein the core is a writing portion on the front end side. a cover member that covers the writing unit in a cylindrical shape and moves back and forth to make the writing unit appear and disappear; and a cover support that supports the cover member so that it can advance and retreat from the inside, , an engaging projection projecting radially outward of the shaft cylinder is provided, the cover member is provided with a through-shaped guide hole through which the engaging projection is inserted so as to advance and retreat, and the front end inner edge of the guide hole is provided. Alternatively, a retractable writing instrument, wherein the inner edge of the rear end has an inclined edge portion inclined with respect to the circumferential direction of the barrel.

ADVANTAGE OF THE INVENTION Since this invention is comprised as demonstrated above, it can prevent that the center core which advances and retracts interferes with a surrounding part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows an example of the retractable writing instrument which concerns on this invention. It is a perspective view which shows the state which removed the front shaft about the same haunting-type writing instrument. It is a principal part exploded perspective view of the same haunting-type writing instrument. It is a top view which shows an example of the cover member of the same haunting-type writing instrument. It is a longitudinal cross-sectional view of the same cover member. FIG. 2 is an enlarged vertical cross-sectional view of the main part showing a state in which the writing part of one of the inner cores of the retractable writing instrument is protruded. Fig. 10 is a perspective view showing another example of the retractable writing instrument according to the present invention, omitting illustration of the front barrel; 8A to 8D are plan views showing other examples of the cover member. FIG.

The present embodiment discloses the following features.
A first feature is a retractable writing instrument comprising a barrel and a core housed in the barrel, wherein the core is projected and retracted from the front end of the barrel, wherein the core is , a writing part on the front end side, a cover member that covers the writing part in a cylindrical shape and advances and retreats so that the writing part appears and disappears, and a cover support part that supports the cover member so that it can advance and retreat from the inside, The cover support portion is provided with an engaging projection projecting outward in a radial direction of the shaft cylinder, and the cover member is provided with a through-shaped guide hole through which the engaging projection is inserted so as to advance and retreat, The inner edge at the front end or the inner edge at the rear end of the guide hole has an inclined edge portion inclined with respect to the circumferential direction of the shaft cylinder (see FIGS. 1 to 8).

As a second feature, the inner edge at the front end or the inner edge at the rear end of the guide hole has a shape in which the center side portion in the circumferential direction of the shaft cylinder protrudes to one side in the axial direction of the shaft cylinder, and both side portions of the projecting end are inclined as described above. It forms an edge (see FIG. 4).

As a third feature, the front inner edge or the rear inner edge of the guide hole forms the inclined edge portion continuously in a curved shape (see FIG. 8(b)).

As a fourth feature, a chamfered portion is provided on the radially outer side of the inclined edge portion (see FIG. 5).

As a fifth feature, a plurality of cores are provided in the barrel, and at least one of the plurality of cores is provided with the cover member (see FIGS. 1, 2, and 6). .

As a sixth feature, a plurality of the cores are provided so as to line up in the radial direction of the shaft cylinder, and the guide holes are opened in a direction that intersects the alignment direction of the plurality of cores (FIG. 7). reference).

<Specific embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings.

In this specification, the axial direction of the barrel means the direction in which the center line of the barrel extends, and the circumferential direction of the barrel means the direction around the center line of the barrel. Further, "front" means one side in the axial direction of the barrel and the direction in which the writing part protrudes, and "rear" means the side opposite to the one side.
Further, in this specification, the radial direction of the barrel means the diameter direction of the barrel perpendicular to the center line of the barrel. The outer side in the radial direction of the barrel means the direction away from the center of the barrel along the radial direction of the barrel, and the inner side in the radial direction of the barrel means the direction toward the center of the barrel along the radial direction of the barrel.

FIG. 1 shows an example of a retractable writing instrument according to the present invention.
This retractable writing instrument 1 includes a barrel 10, a plurality of (two in the illustrated example) operating members 20 exposed to the outside at the rear end of the barrel, and a barrel connected to the front end of each operating member 20. A center core 30 housed in the barrel 10 is provided, and the center core 30 corresponding to the operation member 20 that has been selectively operated appears and disappears at the front end of the barrel 10. - 特許庁

The shaft tube 10 is formed in a long, substantially tubular shape, has a tapered front end portion 11 on the front end side, and has a window portion 12 through which the operation member 20 is exposed on the peripheral wall on the rear end side. In the window portion 12, there are provided a guide surface 13 for guiding the operation member 20 in the front-rear direction, and a locked portion 14 for locking the operation member 20 when moving forward (see FIG. 1).

As shown in the figure, the barrel 10 comprises a front shaft 10a and a rear shaft 10b detachably connected to an opening at the rear end of the front shaft 10a. As examples other than the illustrated example, the shaft tube 10 may be configured from a single cylindrical member, or may be configured from three or more cylindrical members.

In the illustrated example of the axial cylinder 10, the width W in the direction in which the two cores 30 are arranged is larger than the width in the direction substantially perpendicular to the width W (see FIG. 2).
Other examples of the cross-sectional shape of the barrel 10 include a circular shape, an elongated hole shape, a rectangular shape, and a diamond shape.

The operating member 20 is detachably connected to the rear end side of each center core 30 so as to advance and retreat integrally with the center core 30 . The operating member 20 is biased rearward by a biasing member 50 (compression coil spring in the illustrated example) whose one end side is hooked to a stationary portion (divider 40 in the illustrated example) in the barrel 10 . ing.
When the operation member 20 is pushed forward, it advances while sliding on the guide surface 13 inside the barrel 10, sinks into the barrel, and engages with the locked portion 14 inside the barrel. Then, when another operating member 20 advances, the operating member 20 is brought into contact with the advanced operating member 20 to release the locked state, and is retracted by the biasing force of the biasing member 50 . do.

The plurality of operation members 20 configured as described above are each inserted through the divider 40 in the barrel 10 at the front end side thereof.
The divider 40 is a substantially columnar member fixed to the inner peripheral surface of the barrel 10, and has a plurality of through holes 41 through which the plurality of operation members 20 are inserted so that they can advance and retreat.

A plurality of cores 30 (two in the illustrated example) are provided so as to be spaced apart in the radial direction of the barrel 10 , and each of them is detachably connected to the front end side of the operation member 20 .
Each core 30 includes a long shaft-shaped filling 31, a pen shaft 32 connected to the front end side of the filling 31 and extending forward, a substantially cylindrical case 33 covering the filling 31 and the pen shaft 32, and a case. A cover member 34 is mounted reciprocably on the front end side of a pen shaft 33 to cylindrically cover a writing part 30a on the front end side of a pen shaft 32 and advances and retreats so that the writing part 30a appears and disappears, and the cover member 34 is biased forward. It comprises a biasing member 35 and constitutes a writing lead for a marker pen.

The batting 31 covers a large number of synthetic fibers bundled in the shape of a shaft with a thin cylindrical coating, impregnates the inside with ink, and constitutes an ink reservoir.

The pen shaft 32 is a shaft-like bundle of fibers, and the ink capillary force of the filling 31 causes the ink to flow forward. The front end side of the pen shaft 32 is processed into a wedge shape, and the front end thereof serves as a writing portion 30a for applying ink to the surface to be written. The writing part 30a having such a shape is sometimes called a chisel tip.

The case 33 is integrally composed of a large-diameter cylindrical batting storage portion 33a for storing the batting 31 and a small-diameter cylindrical cover support portion 33b whose diameter is stepwise reduced on the front side of the batting storage portion 33a. .

The batting storage part 33a contains the batting 31 so as not to advance or retreat. A rear end opening of the batting storage portion 33a is closed by a tail plug-shaped connected member 36. As shown in FIG.

The connected member 36 is fixed to the rear end portion of the batting storage portion 33a so as to be non-rotatable and non-progressive.
The connected member 36 is detachably fitted to the front end portion of the operation member 20, and the core 30 is made non-rotatable by the rotation restricting portion, and the core 30 is held so as to flexibly tilt. there is

The rotation restricting portion may be configured between the operating member 20 and the core 30 so as to prevent the core 30 from rotating around the axis. It is composed of a small concave portion provided on one side and partially recessed in the circumferential direction, and a small convex portion provided on the other side of the one side and fitted into the small concave portion (not shown).
Further, as another example of the rotation restricting portion, one of the operating member 20 and the connected member 36 is formed into a prism shape, and the other is formed into a square hole shape to fit the one. For example, one side is formed in an elliptical cylinder shape, and the other side is formed in an elliptical hole shape that fits into the one side.

The cover support portion 33b is a cylindrical portion that internally accommodates the pen shaft 32 so as not to advance or retreat.
An engaging protrusion 33b1 is provided on the outer peripheral surface of the front end side of the cover support portion 33b so as to protrude outward in the radial direction of the shaft cylinder (see FIG. 3).

A plurality of engaging projections 33b1 are provided at intervals in the circumferential direction of the shaft cylinder (two at equal intervals according to the illustrated example). Each engagement protrusion 33b1 in the illustrated example is a quadrangular prism-shaped protrusion.

A biasing member support portion 35b2 that is inserted into the rear end side of the biasing member 35 to support the biasing member 35 is provided on the rear end side of the cover support portion 33b.
The biasing member support portions 35b2 are a plurality of (four according to the illustrated example) projections spaced apart in the circumferential direction.
In FIG. 3, reference numeral 35b3 denotes an air exchange hole penetrating the cover support portion 33b in the radial direction.

The biasing member 35, which is a compression coil spring, is annularly mounted behind the engaging projection 33b1 of the cover support portion 33b, and biases the cover member 34 forward.
The rear end side of the biasing member 35 is annularly attached to the plurality of biasing member support portions 35b2, and the rearmost end portion of the biasing member 35 abuts on the stepped portion at the front end of the batting storage portion 33a. A front end portion of the biasing member 35 abuts a rear end portion of the cover member 34, which will be described later.

The cover member 34 is a long, substantially cylindrical member, and has a front end portion that covers the writing portion 30a in a cylindrical shape, and a rear end portion that is fitted to the cover support portion 33b so as to be able to advance and retreat.
A through-shaped guide hole 34a is provided in the peripheral wall of the cover member 34 so that the engaging protrusion 33b1 can be inserted forward and backward.

A plurality of guide holes 34a are provided corresponding to the plurality of engaging projections 33b1 of the cover support portion 33b (according to the illustrated example, two guide holes are provided at equal intervals in the circumferential direction of the shaft cylinder).
Each guide hole 34a is formed in a substantially rectangular shape in plan view (see FIG. 4), and has inclined edge portions 34a1 and 34a2 inclined with respect to the circumferential direction of the shaft cylinder at the inner edge of the front end thereof.

More specifically, the inner edge of the front end of the guide hole 34a is substantially projected in a plan view by projecting the central portion in the circumferential direction of the barrel to one side in the axial direction of the barrel (according to the example in FIG. 4, to the front of the barrel). It is formed in a shape (in other words, a V-shape), and both side portions of the protruded end form inclined edges 34a1 (or 34a2), respectively.

One inclined edge portion 34a1 inclines obliquely rearward from the tip toward one side in the axial cylinder circumferential direction (see FIG. 4).
The other inclined edge portion 34a2 is inclined obliquely rearward from the tip toward the other side in the axial cylinder circumferential direction.

A chamfered portion 34a3 is provided on the radially outer side of each inclined edge portion 34a1 (or 34a2) (see FIG. 5). The chamfered portion 34a3 is an inclined surface directed outward in the radial direction of the front oblique shaft cylinder. The chamfered portion 34a3 in the illustrated example is formed in a C chamfered shape, but it can also be formed in an R chamfered shape or other curved surface shapes.

Next, the characteristic functions and effects of the retractable writing instrument 1 configured as described above will be described in detail.
When one core 30 moves forward by pushing the operating member 20 , the front edge of the cover member 34 of this core 30 may interfere with the guide hole 34 a of the other core 30 .
In such a case, the front edge of one of the cores 30 is guided to one side in the circumferential direction by the inclined edge 34a1 or the inclined edge 34a2 of the inner edge of the front end of the guide hole 34a of the other core 30, and is further guided to the chamfered portion. 34a3 leads radially outward.
Therefore, the front edge of the cover member 34 of one of the cores 30 is prevented from coming into contact with the front inner edge of the guide hole 34a of the other core 30 to prevent the forward movement of the one core 30 from being hindered. be able to.

Also, when one core 30 moves backward, the guide hole 34a of the center core 30 should be prevented from moving back by abutting the front edge of the cover member 34 of the other core 30. , the slanted edge portion 34a1, the slanted edge portion 34a2, the chamfered portion 34a3, and the like of the core 30 on one side.

In addition, the guide hole 34a that advances and retreats does not interfere with, for example, a stepped portion (not shown) of the inner surface of the barrel 10 or a member (not shown) inside the barrel 10. This can be blocked by the chamfered portion 34a3 or the like.

Therefore, according to the retractable writing instrument 1 configured as described above, it is possible to prevent the moving core from interfering with the surrounding portion and causing malfunction.

<Modification>
Part of the configuration of the retractable writing instrument 1 having the above configuration can be changed as described below.
The retractable writing instrument shown in FIG. 7 is obtained by changing the positions of the guide holes 34a in the circumferential direction of the retractable writing instrument 1 described above.
Specifically, each guide hole 34a opens in a direction that intersects (perpendicularly in the illustrated example) the direction in which the plurality of cores 30 are arranged.
Therefore, according to this retractable writing instrument, it is possible to more effectively prevent the guide hole 34 a of one core 30 from interfering with the other core 30 .

Further, in the retractable writing instrument 1 configured as described above, the cover member 34 can be replaced with any one of the cover members 61, 62, 63 and 64 shown in FIGS. 8(a) to (d).

The cover member 61 is obtained by adding inclined edge portions 34a1' and 34a2' and a chamfered portion 34a3' to the inner edge of the rear end of the guide hole 34a.
The slanted edge portions 34a1' and 34a2' and the chamfered portion 34a3' are obtained by reversing the front and rear directions of the slanted edge portions 34a1 and 34a2 and the chamfered portion 34a3.
Therefore, according to the retractable writing instrument provided with this cover member 61, the guide hole 34a of one of the cores 30 that advances and retreats is more effectively prevented from interfering with surrounding members (including the other core 30). can be prevented.

The cover member 62 is formed with inclined edge portions 62a, 62a' and chamfered portions 62b, 62b', which are continuous in a curved shape, at the inner edge of the front end and the inner edge of the rear end of the guide hole 34a, respectively.
The front inclined edge portion 62a is formed in an arcuate shape protruding forward. The chamfered portion 62b is an inclined surface directed outward in the front oblique axial cylinder radial direction, and is formed along the inclined edge portion 62a.
The rear inclined edge portion 62a' is also formed in an arcuate shape protruding forward. The chamfered portion 62b' is an inclined surface directed outward in the radial direction of the rear oblique axial cylinder, and is formed along the inclined edge portion 62a'.
Therefore, according to the retractable writing instrument having the cover member 62, it is possible to more effectively exhibit the same effects as the retractable writing instrument 1 described above.

The rear inclined edge portion 62a' and the chamfered portion 62b' may be formed in an arcuate shape projecting rearward (that is, the inclined edge portion 62a and the chamfered portion 62b are oriented in the opposite direction).

The cover member 63 has a single inclined linear inclined edge portion 63a, 63a' and a chamfered portion 63b, 63b' formed on the inner edge of the front end and the inner edge of the rear end of the guide hole 34a, respectively.
The retractable writing instrument provided with the cover member 63 can also effectively obtain the same effects as the retractable writing instrument 1 described above.

The cover member 64 has three or more inclined edge portions 64a, 64a' bent in plan view and chamfered portions 64b, 64b', respectively, at the inner edge of the front end and the inner edge of the rear end of the guide hole 34a.
Also in the retractable writing instrument provided with the cover member 64, the same effects as those of the retractable writing instrument 1 can be effectively obtained.

Further, according to the above embodiment, all of the plurality of cores 30 are provided with the cover member 34. However, if at least one of the plurality of cores is provided with the cover member, the present invention can be applied. exert its effect.
For example, one of the plurality of cores is the core 30 having the cover member 34, and the other cores are cores for ballpoint pens without cover members, cores for mechanical pencils, and cores for electronic pens. It may be a core or the like.

Further, according to the above-described embodiment, the retractable writing instrument 1 having a plurality of cores 30 inside the barrel 10 is constructed. It is also possible to construct a writing instrument.
In this retractable writing instrument as well, when the single core 30 appears and retracts, the guide hole 34a of the cover member 34 in the core 30 is aligned with the surrounding member or part (for example, the stepped portion inside the barrel 10). It is possible to prevent the forward and backward movement of the center core 30 from interfering with each other.

Moreover, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

1: Retractable Writing Instrument 10: Axle 20: Operating Member 30: Core 30a: Writing Part 33b: Cover Supporting Part 33b1: Engagement Projection 34, 61: Cover Member 34a: Guide Hole 34a1, 34a2: Inclined Edge

Claims (6)

A retractable writing instrument comprising a barrel and a core housed in the barrel, wherein the core is retracted from a front end of the barrel,
The core includes a writing part on the front end side, a cover member that covers the writing part in a cylindrical shape and advances and retreats to make the writing part appear and disappear, and a cover supporting part that supports the cover member so that it can advance and retreat from the inside. and
The cover support portion is provided with an engaging projection projecting outward in the radial direction of the shaft cylinder,
The cover member is provided with a through-shaped guide hole through which the engaging projection is inserted so as to be advanced and retracted,
A retractable writing instrument, wherein the front inner edge or the rear inner edge of the guide hole has an inclined edge portion inclined with respect to the circumferential direction of the barrel. The inner edge at the front end or the inner edge at the rear end of the guide hole has a shape in which the central portion in the circumferential direction of the barrel protrudes to one side in the axial direction of the barrel. 2. The retractable writing instrument according to claim 1, characterized in that it has a recess. 2. The retractable writing instrument according to claim 1, wherein the front inner edge or the rear inner edge of the guide hole continues in a curved shape to form the inclined edge. The retractable writing instrument according to any one of claims 1 to 3, wherein a chamfered portion is provided on the radially outer side of the inclined edge portion. A plurality of cores are provided in the barrel, and at least one of the plurality of cores is provided with the cover member. haunting writing instrument. A plurality of the cores are provided so as to line up in the radial direction of the shaft cylinder,
6. The retractable writing instrument according to claim 5, wherein said guide hole is open in a direction intersecting with a direction in which said cores are arranged.

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