JP2023013018A - writing instrument - Google Patents

Abstract

To hold a writing lead from rotating.SOLUTION: The writing instrument includes: a barrel 10; a base member 20 provided on a rear side in the barrel 10; and a writing lead 30 detachably connected to a front end side of the base member 20 and having a writing portion 30a facing forward, wherein a rotation restricting portion X is provided between the base member 20 and the writing lead 30 to prevent the writing lead 30 from rotating in a circumferential direction.SELECTED DRAWING: Figure 6

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a writing core having a writing part at its front end is housed in a barrel.

2. Description of the Related Art Conventionally, this type of writing instrument includes a writing instrument in which a writing core constituting a marker pen, a ballpoint pen, a mechanical pencil, or the like protrudes and retracts from the front end of a barrel, as described in Patent Document 1, for example.
In this writing instrument, the shaft-like portion at the front end of the slide piece is inserted and fitted into a cylindrical mounting hole in a tail plug provided at the rear end of the writing lead.

JP 2020-179623 A

By the way, in such a conventional writing instrument, although the mounting hole is fitted to the slide piece, there are cases where the writing lead rotates with respect to the slide piece due to force or vibration applied to the writing lead. be. In such a case, the following inconvenience may occur.
For example, when the writing part of the writing lead is a writing lead for a marker pen and has an inclined surface at the tip thereof, when the writing lead rotates, the contact state between the inclined surface and the surface to be written becomes unstable. , the scribe may not be able to draw a writing line of the thickness intended.
Also, if the writing lead is a writing lead for a mechanical pencil, if the tip of the lead lead is unevenly worn and the writing line becomes thicker, even if you try to eliminate the uneven wear by rotating the barrel, the barrel will There is a possibility that the writing lead will rotate and the uneven wear cannot be eliminated.

In view of such problems, the present invention comprises the following configurations.
a writing core detachably connected to a front end side of the base member and having a writing portion facing forward; 1. A writing utensil comprising a rotation restricting portion provided between the writing leads so as to prevent the writing leads from rotating in the circumferential direction.

Since the present invention is configured as described above, it is possible to hold the writing lead so as not to rotate.

1 is a vertical cross-sectional view showing an example of a writing instrument according to the present invention; FIG. FIG. 2 is a cross-sectional view taken along line (II)-(II) in FIG. 1; FIG. 4 is a vertical cross-sectional view showing a connection state between a writing lead and a base member; It is a perspective view which shows an example of a base member. FIG. 2 is an exploded view of the writing lead and the base member, showing the writing lead in longitudinal section and the base member in side view; Fig. 3 is an exploded perspective view showing essential parts of a writing lead and a base member; FIG. 2 shows another example of the writing instrument according to the present invention, and is a cross-sectional view of a position corresponding to line (II)-(II) in FIG. 1 ;

The present embodiment discloses the following features.
A first characteristic is provided with a barrel, a base member provided on the rear side in the barrel, and a writing core detachably connected to the front end side of the base member and having a writing portion directed forward. A rotation restricting portion is provided between the base member and the writing lead to prevent the writing lead from rotating in the circumferential direction (see FIGS. 1 to 7).

As a second feature, the rotation restricting portion is provided in one of the base member and the writing lead and fits into the small recess formed by recessing a part in the circumferential direction, and the small recess formed in the other of the one. It consists of a matching small projection (see FIGS. 2 to 7).

As a third feature, one of the base member and the writing lead is provided with a fitting recess in which the small recess is formed in the peripheral wall, and the other is fitted into the fitting recess and is attached to the outer peripheral portion. A fitting protrusion having the small protrusion is provided (see FIGS. 2 to 7).

As a fourth feature, the peripheral wall of the fitting recess is provided with a tapered portion so as to guide the small protrusion in the front oblique circumferential direction when moving forward and fit it into the small recess (FIGS. 2 and 4). 5, see FIGS. 6 and 7).

As a fifth feature, the inner peripheral surface of the fitting concave portion and the outer peripheral surface of the fitting convex portion are respectively provided with an overriding surface so that the fitting convex portion can get over the fitting recess when the fitting convex portion is fitted to the fitting concave portion. A fitting projection is provided (see FIGS. 3-6).

As a sixth feature, the inner peripheral surface of the fitting concave portion and the outer peripheral surface of the fitting convex portion are respectively provided with an overriding surface so that the fitting convex portion can get over the fitting recess when the fitting convex portion is fitted to the fitting concave portion. A fitting projection is provided, and the fitting projection for overriding the fitting recess and the fitting projection for overriding the fitting projection are provided so as to be fitted over each other after the small projection enters the small recess. (See FIGS. 3, 5 and 6, etc.).

As a seventh feature, the barrel has a first radial width larger than a second radial width orthogonal to the first width, and the writing portion has a radially elongated tip. The writing lead has a surface, and the writing lead is connected to the base member with the longitudinal direction of the tip surface approximately aligned with the first width direction (see FIGS. 1 and 2).

As an eighth feature, a plurality of the writing leads are provided in the barrel, and a retractable writing instrument is constructed in which the plurality of writing leads are selectively protruded, and the direction in which the plurality of writing leads are arranged is the first The direction of the width of the is approximately matched (see FIG. 2).

As a ninth feature, the writing lead is formed to have an elliptical cross section (see FIG. 7).

As a tenth feature, a plurality of the writing leads are provided so as to line up in the minor axis direction of an ellipse in cross section (see FIG. 7).

It should be noted that the embodiments described later also disclose inventions in which only the following constituent requirements are essential.
That is, one aspect of the present invention is a writing instrument comprising a barrel, a base member provided on the rear side of the barrel, and a writing portion connected to the front end side of the base member and facing forward. and a writing lead, wherein the barrel has a first radial width larger than a second radial width perpendicular to the first width, and the writing portion has a radially elongated tip. The writing lead has a surface, and the writing lead is connected to the base member with the longitudinal direction of the tip surface approximately aligned with the first width direction (see FIGS. 1 and 2).
According to the present invention, a writer or the like can recognize the longitudinal direction of the front end surface of the writing section by the feel of gripping the barrel, and thus can perform writing operations quickly.

Further, as another invention, there is provided a writing lead for a writing instrument, in which an ink reservoir is formed in an elliptical cross section (see FIG. 7).
According to this invention, a relatively large amount of ink can be stored by the ink reservoir having an elliptical cross section.

Still another aspect of the present invention is a writing utensil comprising the writing lead having the ink reservoir in the barrel, wherein a plurality of the writing leads are aligned in the minor axis direction of the ellipse in the ink reservoir. provided (see FIG. 7).
According to this invention, a plurality of writing leads can be efficiently stored in the space inside the barrel.

<First 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 lead 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 writing instrument according to the present invention.
This writing instrument 1 includes a barrel 10, a plurality of base members 20 provided on the rear side of the barrel, and a front end side of each base member 20 that is detachably connected to direct a writing portion 30a forward. It comprises a writing core 30, a divider 40 through which each of the plurality of base members 20 can be advanced and retracted, and an urging member 50 that urges the plurality of base members 20 rearward. ), the writing lead 30 corresponding to the selected base member 20 is projected and retracted from the front end of the barrel 10 (see FIG. 1).

The shaft tube 10 is formed in a long, substantially cylindrical shape, has a tapered front end portion 11 on the front end side, and has a window portion 12 on the rear end side peripheral wall for exposing the base member 20 (operating member). have. Further, in the window portion 12, there are provided a guide surface 13 for guiding the base member 20 in the front-rear direction, and a locked portion 14 for locking the base 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.

A first radial width W1 of the axial cylinder 10 is larger than a second radial width W2 substantially perpendicular to the first width W1 (see FIG. 2).
In other words, the transverse cross-sectional shape of this barrel 10 is a substantially elongated hole shape in which the first width W1 is greater than the second width W2.
As another example of the shaft tube 10, the cross-sectional shape can be an elongated hole shape, a rectangular shape, a diamond shape, or the like.

The base member 20 is an operation member for retracting and retracting the writing part 30a at the front end of the writing lead 30, and is detachably connected to the rear end side of the writing lead 30 so as to advance and retreat integrally with the writing lead 30. .

The base member 20 includes an elongated slide main body portion 21 that extends in the longitudinal direction inside the barrel 10, and an operation that protrudes radially outward from the rear end side of the slide main body portion 21 and is exposed to the outside of the barrel. a portion 22, a sliding protrusion 23 protruding to both sides in the circumferential direction on the radially inner side of the slide main body 21, a locking portion 24 protruding rearward on the rear end side of the slide main body 21, and a writing lead. 30, a biasing member mounting portion 26 to which the biasing member 50 is annularly mounted, and a biasing member receiving portion 27 that receives the rear end of the biasing member 50. (see FIGS. 1 and 4).

When the operation portion 22 is pushed forward, the base member 20 advances while the sliding convex portion 23 is brought into sliding contact with the guide surface 13 in the shaft tube 10, and sinks into the shaft tube. 24 is locked to the locked portion 14 in the shaft cylinder. When another base member 20 advances in the locked state, the base member 20 is brought into contact with the advanced base member 20 to release the locked state.

The fitting convex portion 25 on the front end side of the base member 20 includes a jumping fitting projection 25a projecting forward and having a convex outer peripheral surface and a small fitting projection 25a projecting radially outward from the outer peripheral surface of the riding fitting projection 25a. It integrally has a convex portion 25b.

The step-over fitting projection 25a has a substantially conical shape whose diameter gradually expands forward, and its outer peripheral surface bulges outward in the radial direction to form a convexly curved longitudinal section (FIGS. 5 and 6). etc.).

A plurality of small projections 25b are provided at intervals in the circumferential direction (two at equal intervals in the illustrated example). Each small projection 25b is formed in the shape of a rectangular parallelepiped elongated in the front-rear direction, and is positioned rearward of the forefront end of the jump-over fitting projection 25a.

A plurality of writing leads 30 (two in the illustrated example) are provided so as to be spaced apart in the direction of the first width W1 of the barrel 10 .

Each writing lead 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 attached to the front end side of the case 33 so as to be able to move back and forth to cover the writing portion 30a at the front end of the pen shaft 32; a biasing member 35 that biases the cover member 34 forward; A connected member 36 connected to the fitting projection 25 at the front end of 20 constitutes a writing core for a marker pen.

The writing lead 30 is non-rotatably connected to the base member 20 by interposing a rotation restricting portion X on the rear end side (see FIGS. 3 and 5, etc.).

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. A writing portion 30a for applying ink to a surface to be written is formed at the front end portion of the pen shaft 32. As shown in FIG.

By processing the front end side of the pen shaft 32 into a wedge shape, the writing portion 30a has a tip surface inclined with respect to the axial direction of the barrel when viewed from the side (see FIG. 1), and when viewed from the front. It is formed in a rectangular shape elongated in the radial direction (see FIG. 2). The writing part 30a having such a shape is sometimes called a chisel tip.
The writing lead 30 is connected to the base member 20 such that the longitudinal direction of the distal end surface of the writing portion 30a is substantially aligned with the direction of the first width W1.

The case 33 has a substantially cylindrical shape elongated in the front-rear direction, and its front end side is stepped forward in diameter. An annular recess 33a for mounting the force member 35 is formed.

The annular concave portion 33a is elongated in the front-rear direction so as to move the cover member 34 back and forth by a predetermined amount.

The cover member 34 covers the writing section 30a with its front end portion, and has its rear end portion fitted into the annular recess 33a so as to be able to move forward and backward.
The urging member 35 is a compression coil spring, and has its front end in contact with the rear end of the cover member 34 and its rear end in contact with the rear end wall of the annular recess 33a, so that it is inserted into the annular recess 33a. It is mounted in an annular shape and biases the cover member 34 forward.

According to this configuration, when the writing lead 30 moves forward, the cover member 34 abuts against the inner surface of the tip portion 11 and cannot move forward. Therefore, the writing part 30a protrudes from the front end of the cover member 34 and also protrudes from the opening at the front end of the barrel 10. As shown in FIG. During this movement, biasing member 35 elastically contracts.
Further, when the writing portion 30a is retracted into the barrel 10, the cover member 34 moves relatively forward due to the biasing force of the biasing member 35 as the writing lead 30 retreats, and covers the writing portion 30a.

Further, the connected member 36 functions as a plug member that closes the rear end opening of the batting 31 and also functions as a member for connecting the writing lead 30 to the base member 20 .

In more detail, the connected member 36 is a substantially bottomed tubular member having a front end as a bottom portion, and its outer peripheral surface is located on the rear side of the batting 31 and on the inner peripheral surface of the case 33 on the rear end side. pressed in. In FIG. 5, reference numeral 33b denotes an annular protrusion that is pressed against the outer peripheral surface of the member 36 to be connected.
In the rear portion of the connected member 36 , a bottomed cylindrical fitting recess 36 a having a rear opening and a front end as a bottom is formed so as to fit the fitting projection 25 of the base member 20 .

The inner peripheral surface of the fitting recess 36a is formed with a small recess 36a1 that is partially recessed in the circumferential direction, and a fitting protrusion 36a2 that fits over the fitting protrusion 25a of the base member 20 to fit thereon.
In addition, a tapered portion 36a3 is formed on the peripheral wall of the fitting recess 36a so that the small protrusion 25b of the base member 20 when moving forward is guided in the forward oblique circumferential direction and fitted into the small recess 36a1 of the fitting recess 36a peripheral wall. is provided.

One or a plurality of small recesses 36a1 (two in the illustrated example) are provided on the peripheral wall of the fitting recess 36a.
Each of the small recesses 36a1 is formed in a concave shape by recessing the inner peripheral surface of the fitting recess 36a radially outward and opening the rear (see FIG. 6).

The stepping-over fitting projection 36a2 is a projection extending in the circumferential direction along the inner peripheral surface of the fitting recess 36a.
After the advancing small projection 25b enters the small recess 36a1, the ride-over fitting projection 36a2 is provided at a midway position in the longitudinal dimension of the small recess 36a1 so that the ride-over fitting is performed in the middle of the forward movement. .

The tapered portion 36a3 is a slanted surface that extends forward while rotating along the inner peripheral surface of the fitting recess 36a, and is continuous from the rear end surface of the connected member 36 to the small recess 36a1.

The small convex portion 25b and the small concave portion 36a1 configured as described above function as a rotation restricting portion X between the base member 20 and the writing lead 30 to prevent the writing lead 30 from rotating in the circumferential direction.

The inner surface of the fitting recess 36a is loosely fitted to the fitting protrusion 25 so that the writing lead 30 swings (see FIG. 3).

The divider 40 is a substantially disk-shaped member fixed to the inner peripheral surface of the barrel 10, and has a plurality of through holes 41 through which the plurality of base members 20 are inserted so that they can advance and retreat.

The biasing member 50 is a compression coil spring, and is annularly mounted on the biasing member mounting portion 26 of the base member 20. The front end of the biasing member 50 is locked to the divider 40 and the rear end thereof is locked to the base member 20. , biases the base member 20 rearward.

Next, the characteristic functions and effects of the writing instrument 1 having the above configuration will be described in detail.
When connecting the writing lead 30 to the base member 20, such as when manufacturing the writing instrument 1 or replacing the writing lead 30, the writing lead 30 is attached to the base member 20 while the axes of these two members are aligned. When the writing lead 30 is retracted, the front end surface of the small convex portion 25b slides against the tapered portion 36a3 at the rear end of the writing lead 30, and the writing lead 30 rotates. Part 25b is inserted. During this insertion, the overriding fitting projection 36a2 on the writing lead 30 side is overridden by the overriding fitting projection 25a on the base member 20 side. Note that the writing lead 30 can be removed from the fitting protrusion 25 by pulling it strongly.

When the writing instrument 1 is in use, the writing core 30 does not rotate because the small concave portions 36a1 are fitted to the small convex portions 25b. Therefore, it is possible to prevent the contact state between the inclined surface at the front end of the writing portion 30a (chisel tip) and the surface to be written from becoming unstable, preventing the writer from being unable to draw the intended writing line.

In addition, according to the writing instrument 1, since the first width W1 of the cross section of the barrel 10 is larger than the second width W2, a writer or the like can feel the front end of the writing portion 30a when gripping the barrel 10. It is possible to recognize the longitudinal direction of the surface, and as a result, it is possible to quickly perform a writing action using the writing instrument 1 .

<Second embodiment>
Next, other embodiments according to the present invention will be described. In the embodiment shown below, since the writing instrument 1 having the above configuration is partially modified, the modified parts will be mainly described in detail, and the parts that operate in substantially the same manner will be denoted by the same reference numerals. , redundant detailed description is omitted.

A writing instrument 2 shown in FIG. 7 is obtained by replacing the barrel 10 with a barrel 10' and replacing the writing lead 30 with a writing lead 30'.

The shaft tube 10' is formed in a substantially elongated cylindrical shape by one or more tubular members.

The writing lead 30' is formed to have an elliptical cross section, and a plurality of (two in the illustrated example) are provided in the barrel 10' so as to line up in the minor axis direction of the ellipse in the cross section. .

Each writing lead 30' is obtained by forming the filling 31, the portion around the filling 31 of the case 33, the outer peripheral side of the connected member 36, etc. of the writing lead 30 into an elliptical cross section.

Therefore, according to the writing instrument 2 shown in FIG. 7, in addition to having the same effects as the writing instrument 1, a relatively large amount of ink can be secured for each writing lead 30'. Moreover, the writing lead 30' with a large amount of ink can be efficiently arranged in the barrel 10'.

<Other Modifications>
According to the above-described embodiment, the writing lead is configured as a writing lead for a marker. It can be replaced with a refill for a marker pen, a refill for an electronic pen, or the like.
For example, when the writing lead is replaced with a refill for a mechanical pencil, an action of rotating the barrel is effective as an action for eliminating uneven wear of the tip of the lead lead.

Further, according to the above embodiment, the writing instrument is configured as a multi-retractable writing instrument, but the present invention is also applicable to a writing instrument that allows a single writing lead to appear and retract, a writing instrument that has a fixed writing lead and does not retract, and the like. It is possible. In the latter case, the base member 20 may be a member fixed inside the shaft cylinder instead of a sliding operating body.

Further, according to the above embodiment, the fitting convex portion 25 on the base member 20 side is fitted into the fitting concave portion 36a on the writing lead 30 side. It is also possible to fit the fitting concave portion on the base member 20 side to the fitting convex portion on the 30 side.
Similarly, for the small recess 36a1 and the small protrusion 25b, it is possible to reverse the relationship between the protrusions and recesses.

Further, according to the above embodiment, the rotation restricting portion X is constituted by the small concave portion 36a1 and the small convex portion 25b. As another example of the rotation restricting portion, one of the front end side of the base member and the rear end side of the writing lead is formed into a prism shape, and the other is formed into a square hole shape that fits in the one. A mode and a mode in which the one is formed in the shape of an elliptical cylinder and the other is formed in the shape of an elliptical hole that fits into the one.

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.

Reference Signs List 1, 2: writing instrument 10, 10': shaft tube 20: base member 25: fitting convex portion 25a: overriding fitting projection 25b: small convex portion 30, 30': writing core 30a: writing portion 36: connected member 36a : Fitting recess 36a1: Small recess 36a2: Overpass fitting projection 36a3: Taper portion X: Rotation restricting portion

Claims (10)

a writing core detachably connected to a front end side of the base member and having a writing portion facing forward; 1. A writing utensil comprising a rotation restricting portion provided between the writing leads so as to prevent the writing leads from rotating in the circumferential direction. The rotation regulating part is composed of a small recess provided in one of the base member and the writing lead and partially recessed in the circumferential direction, and a small protrusion provided in the other of the one and fitting into the small recess. 2. The writing instrument of claim 1, wherein the writing instrument comprises: One of the base member and the writing lead is provided with a fitting recess having the small recess formed on its peripheral wall, and the other is fitted into the fitting recess and has the small protrusion on the outer peripheral portion. 3. The writing instrument according to claim 2, further comprising a fitting protrusion. 4. The writing instrument according to claim 3, wherein the peripheral wall of the fitting recess is provided with a tapered portion that guides the small protrusion in a forward oblique circumferential direction and fits into the small recess when moving forward. . The inner peripheral surface of the fitting recess and the outer peripheral surface of the fitting protrusion are provided with fitting projections that pass over the fitting recess when the fitting protrusion is fitted to the fitting recess. 5. The writing instrument according to claim 3 or 4, characterized by: The inner peripheral surface of the fitting recess and the outer peripheral surface of the fitting protrusion are provided with fitting projections that pass over the fitting recess when the fitting protrusion is fitted to the fitting recess. ,
The overriding fitting protrusion of the fitting recess and the overriding fitting protrusion of the fitting protrusion are provided so as to be fitted over after the small protrusion enters the small recess. The writing instrument according to claim 3 or 4. the axial cylinder has a first radial width larger than a second radial width orthogonal to the first width,
The writing unit has a radially elongated distal end surface,
7. The writing lead according to any one of claims 1 to 6, wherein the writing lead is connected to the base member such that the longitudinal direction of the tip end face substantially coincides with the first width direction and is connected to the base member. Writing instrument. A retractable writing utensil comprising a plurality of the writing leads in the barrel and selectively protruding the plurality of writing leads,
8. The writing instrument according to claim 7, wherein the direction in which the plurality of writing leads are arranged is substantially aligned with the direction of the first width. 9. The writing instrument according to any one of claims 1 to 8, wherein the writing lead has an elliptical cross section. 10. The writing instrument according to claim 9, wherein a plurality of said writing cores are provided so as to line up in the minor axis direction of an ellipse in cross section.

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