JP7303669B2 - writing instrument - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument, such as a ballpoint pen or a felt-tip pen, in which a writing part protruding from the front end of a barrel is brought into contact with the surface of paper or the like for writing.

Conventionally, in this type of invention, as described in Patent Document 1, for example, a knock body capable of being knocked is provided in a barrel, a cam slope at the front end of the knock body, a cam slope on the inner surface of the shaft cylinder, and the like. A rotor that rotates by mating together, a return spring that biases the rotor rearward, and a refill whose rear end is fitted in the rotor, and the knock body is knocked. By moving the rotor forward in the axial direction, the rotor is rotated to be in the locked state, and the knock body is knocked again to release the locked state and move the rotor in the axial direction. There is a haunting type ballpoint pen that can be retracted. With such a ball-point pen, writing is performed by pressing the ball-point pen tip at the front end of the refill against a paper surface or the like. At this time, although the front end side of the refill is slightly bent, it is maintained substantially straight without being greatly bent. For this reason, such a conventional ballpoint pen provides a hard writing feel.
On the other hand, as another invention, there is a writing instrument in which the front end side of the barrel is flexibly bent (see Patent Document 2). With such a writing instrument, when the pen tip is pressed against a paper surface or the like, the front end side of the barrel is flexibly deformed, so that a feeling of writing like that of a brush can be obtained.

Japanese Patent Application Laid-Open No. 2002-240485 JP-A-2005-145032

By the way, depending on the user's purpose of writing, the state of fatigue due to writing, the mood of the moment, etc., there are cases where the writing feeling of the writing instrument being used at that time may be desired to be changed appropriately.
However, in the conventional technology, it was not possible to switch between a hard writing feeling and a soft writing feeling with a single writing instrument.

In view of such problems, the present invention comprises the following configurations.
A fixed support state in which the writing lead is supported so as not to tilt, in a writing instrument comprising a barrel and a writing lead housed in the barrel and having a writing portion on the front end side projecting from the front end of the barrel. , a tiltable support state in which the writing lead is tilted, and a tiltable support state in which the writing lead is supported to tilt; A writing utensil comprising a contact support portion having a reduced diameter so as to radially receive an intermediate portion of the lead in the longitudinal direction .

Since the present invention is configured as described above, it is possible to switch the writing feeling of one writing instrument.

1 is a vertical cross-sectional view showing an example of a writing instrument according to the present invention, where (a) shows a state in which the writing lead is retracted at the advanced position of the slider, and (b) shows a state in which the writing lead is protruded at the advanced position of the slider. , and (c) shows a state in which the writing lead protrudes at the retracted position of the slider. It is an exploded perspective view of the same writing instrument. It is a perspective view which notches an axial cylinder about the same writing instrument, and shows an internal structure, (a) is the fixed support state which advanced the slider, (b) is the tiltable support state which retreated the slider. FIG. 4 is a developed view showing the relationship between the rear shaft portion, the rotating shaft portion, and the slider; It is in a state where FIG. 10 is a vertical cross-sectional view of a main part showing a state in which writing is performed with the slider advanced and fixedly supported; Note that hatching is omitted. FIG. 4 is a vertical cross-sectional view of a main part showing how writing is performed in a tiltable support state in which the slider is retracted, (a) showing the state before the writing lead is tilted, and (b) showing the writing lead being tilted. shows the state after In addition, hatching indicates a portion moved forward from the state of (a). It is a longitudinal cross-sectional view explaining the back-and-forth fine movement of a writing lead and a connected member.

The present embodiment discloses the following features.
A first feature is a writing instrument having a barrel and a writing lead housed in the barrel and having a writing portion on the front end side projecting from the front end of the barrel, wherein the writing lead is prevented from tilting. A fixed support state in which the writing lead is supported and a tiltable support state in which the writing lead is tilted are switched (see FIGS. 3 to 6).

A second feature is that when the writing lead is bent under writing pressure, it is contracted on the inner peripheral side of the barrel so as to radially receive an intermediate portion in the longitudinal direction of the bending writing lead. A diameter contact support is provided (see FIG. 6).

A third feature is that the dimension from the front end of the writing lead to the contact support is set within a range of 10 to 50 mm (see FIG. 6).

A fourth feature is a cylindrical slider that is reciprocally contained in the front end of the barrel and through which the writing lead protrudes from the front end, and that biases the slider backward with respect to the barrel. one of the shaft cylinder and the slider is provided with a cam slope and the other is provided with a sliding contact portion that slides on the cam slope, and in the tiltable support state, The radial force transmitted from the writing lead to the slider causes the inclined surface of the cam to come into sliding contact with the sliding contact portion, so that the slider and the writing lead are tilted while moving forward with respect to the barrel (Fig. 6(a)(b)).

A fifth feature is that a small diameter portion and a large diameter portion located behind the small diameter portion are provided on the outer peripheral portion of the slider, and the slider can be moved back and forth between a forward position and a backward position by a predetermined operation. An annular engaging portion is provided on the inner peripheral side of the barrel, and the annular engaging portion engages with the large diameter portion at the forward position to enter the fixed and supported state, and at the retracted position. The tiltable support state is achieved by securing a gap between the annular engaging portion and the small diameter portion (see FIGS. 3, 5 and 6).

As a sixth feature, the barrel includes a rear shaft portion and a rotary shaft portion rotatably connected to the front side of the rear shaft portion, and the slider is advanced or retreated by rotation of the rotary shaft portion. The rotating shaft portion and the slider are engaged with the rear shaft portion so as to rotate (see FIGS. 3 and 4).

As a seventh feature, a connected member to which the rear end side of the writing lead is connected is provided in the barrel, and the connected member is supported so as to move slightly back and forth (see FIG. 7). ).

The eighth feature is that a retraction operation mechanism is provided for retracting the writing lead from the front end portion of the slider in either the fixed support state or the tiltable support state (see FIGS. 1 and 2). ).

A ninth feature is a ball-point pen refill in which the writing lead has a ball-point pen tip as the writing portion on the front end side (see FIGS. 1 and 2).

It should be noted that the embodiments described later also disclose inventions in which only the following constituent requirements are essential.
That is, the present invention provides a writing instrument having a barrel and a writing lead housed in the barrel and having a writing portion on the front end side protruding from the front end of the barrel, wherein the writing lead is tilted. The diameter of the inner peripheral side of the barrel is reduced so as to radially receive an intermediate portion in the longitudinal direction of the bent writing lead when the writing lead is bent under writing pressure. A contact support is provided.
According to the present invention, when the writing lead is tilted and bent under writing pressure, the contact support portion is brought into contact with the outer peripheral portion of the bent writing lead to appropriately suppress the amount of bending of the writing lead. This allows the writer to obtain a good writing feeling.

<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 means the direction in which the center line of the barrel 10 extends. In addition, "front" means one side in the axial direction and the tip of the writing lead. Also, "rear" means the side opposite to the one side.

The writing instrument 1 includes a barrel 10, a writing core 20 which is accommodated in the barrel 10 and has a writing portion 21 on the front end side protruding from the front end of the barrel 10, and a writing core 20 which is reciprocally contained in the front end side of the barrel 10. a cylindrical slider 30 through which the writing lead 20 protrudes from the front end, a first biasing member 40 that biases the slider 30 backward with respect to the barrel 10, A retraction operation mechanism 50 that retracts from the front end is provided.
The writing instrument 1 has a fixed support state (see FIGS. 1(a), 1(b) and 5) in which the writing lead 20 is supported so as not to tilt, and a tiltable support state in which the writing lead 20 is supported so as to tilt. (See FIGS. 1(c) and 6).

The shaft tube 10 includes a cylindrical rear shaft portion 11 and a rotary shaft portion 12 rotatably connected to the front side of the rear shaft portion 11. Rotation of the rotary shaft portion 12 causes the slider 30 to advance or retreat. The rotating shaft portion 12 and the slider 30 are engaged with the rear shaft portion 11 so as to be aligned.

The rear shaft portion 11 includes a long cylindrical rear shaft main body 11a extending in the front-rear direction, and a support shaft 11b detachably connected to the front end side of the rear shaft main body 11a to rotatably support the rotating shaft portion 12. and
The inner peripheral surface of the rear shaft portion 11 has a reduced diameter so that, when the writing lead 20 is bent under writing pressure, the part in the longitudinal direction of the bending writing lead 20 is received in the radial direction. A contact support portion 11c is provided.

The contact support portion 11c is a cylindrical inner surface having a smaller diameter than the front and rear portions thereof. A dimension L from the front end of the writing lead 20 to the front end of the contact support portion 11c is set within a range of 10 to 50 mm, and is set to approximately 32 mm in a preferred example of the present embodiment.
If the dimension L is smaller than the above range, the fulcrum at which the front end side of the writing lead 20 bends due to the writing pressure will be too forward. Also, if the dimension L is larger than the above range, the fulcrum at which the front end side of the writing lead 20 bends due to the writing pressure is too far to the rear side. Therefore, in either case, good smoothness cannot be obtained. Therefore, in a preferred example of the present embodiment, the dimension L is set within the above range.

A clip 11a1 is integrally provided on the outer peripheral surface on the rear end side of the rear barrel main body 11a. The clip 11a1 in the illustrated example is a separate member attached to the rear barrel main body 11a, but it is also possible to use an integrally formed member.
A longitudinal groove 11a2 and a fixed cam inclined surface 11a3, etc., which constitute a part of the retraction operation mechanism 50 described later, are formed on the inner peripheral surface of the rear end side of the rear shaft main body 11a. It is threadedly connected to the shaft 11b, and when removed from the support shaft 11b, the writing lead 20 is detachably exposed.

Further, the support shaft 11b is a long cylindrical member. The front half side of the support shaft 11b is inserted into the cylindrical rotating shaft portion 12, and supports the rotating shaft portion 12 so as to be rotatable and non-retractable. This support structure may be, for example, a structure in which an annular protrusion provided on one of the outer peripheral surface of the support shaft 11b and the inner peripheral surface of the rotating shaft portion 12 is fitted with an annular groove provided on the other. .
A cam portion 11b1 that engages with the slider 30 to move the slider 30 back and forth is provided on the front edge of the support shaft 11b.

The cam portion 11b1 is configured by providing a concave portion, an inclined surface, and the like along the circumferential direction of the front edge of the support shaft 11b.
Specifically, as shown in the developed view of FIG. 4, the cam portion 11b1 has a front concave portion 11b11, a rear concave portion 11b12, an inclined surface portion 11b13, and the like.
The front recessed portion 11b11 and the rear recessed portion 11b12 are semicircular recessed portions with an open front. The rear recessed portion 11b12 is circumferentially spaced from the front recessed portion 11b11 and located on the rear side.
The inclined surface portion 11b13 extends in the circumferential direction of the rear shaft portion 11 and is inclined so as to connect the edge of the front recessed portion 11b11 and the edge of the rear recessed portion 11b12.

The rotating shaft portion 12 is formed of a rotating shaft main body 12a whose rear end side is rotatably connected to the rear shaft portion 11, and a front end cover 12b integrally connected to the front end side of the rotating shaft main body 12a. (See FIGS. 1 and 2).

The rotary shaft main body 12a is formed in an elongated cylindrical shape. The inner peripheral surface of the rotating shaft main body 12a is provided with an annular engaging portion 12a1 positioned on the front end side thereof, and an annular step for receiving the front end portion of the first biasing member 40 on the rear side of the annular engaging portion 12a1. A portion 12a2 and a guide groove 12a3 for guiding the slider 30 in the front-rear direction are provided on the rear side of the stepped portion 12a2.

The annular engaging portion 12a1 is an annular convex portion that protrudes radially inward over the entire circumference from the inner peripheral surface of the rotating shaft main body 12a on the rear side, and is fitted in contact with or close to the large diameter portion 31c of the slider 30. formed to fit.
Further, the annular front edge of the annular engaging portion 12a1 functions as a sliding contact portion 12a11 (see FIG. 6A) for sliding contact with the cam slope 31a of the slider 30. As shown in FIG.

The guide grooves 12a3 are linear concave grooves that are continuous in the front-rear direction, and are provided in plurality (two in the illustrated example) at equal intervals in the circumferential direction.

The front end cover 12b is attached to the outer periphery of the front end of the rotating shaft main body 12a and protrudes forward to project the front end of the slider 30 and cover the portion behind the front end.

The writing lead 20 is a ballpoint pen refill having a well-known structure in which a ballpoint pen tip as a writing portion 21 is connected to the front end side of an ink containing tube 22 .
The ink containing tube 22 is made of an elastically flexible synthetic resin material (such as polypropylene).

The slider 30 is integrally composed of two members, a slider main body 31 and a receiving part 32 connected to the rear side of the slider main body 31, and is moved to a forward position (FIG. 1A) by a predetermined operation. b) and FIG. 5) and a retracted position (see FIGS. 1(c) and 6).
It should be noted that the slider main body portion 31 and the receiving portion 32 can also be formed as a single member integrally formed.

On the outer peripheral surface of the slider main body 31, there are a cam slope 31a whose diameter gradually decreases toward the rear, a small diameter portion 31b connected to the rear end portion of the cam slope 31a and extending rearward, and the small diameter portion 31b. A large-diameter portion 31c connected to the rear side of is provided.
In addition, the inner peripheral surface of the front end side of the slider main body 31 is in contact with the outer peripheral surface of the writing part 21 when protruding, and supports the writing part 21 so as not to move in the radial direction relative to the slider main body 31. A cylindrical contact support surface 31d is provided.

When a force component in the radial direction is applied to the slider 30, the cam slope 31a comes into sliding contact with the sliding contact portion 12a11 on the side of the shaft tube 10, and functions as a motion direction changing means that tilts and moves the slider 30 forward.

The small-diameter portion 31b forms a gap s between the small-diameter portion 31b and the annular engaging portion 12a1 on the side of the barrel 10 so as to tiltably support the slider 30 (tiltably supported state) when the slider 30 is in the retracted position. (See FIGS. 6(a) and 6(b)).

When the slider 30 is in the forward position, the large-diameter portion 31c engages with the annular engagement portion 12a1 on the side of the barrel 10 to support the slider 30 so as not to tilt (fixed support state) (see FIG. 5). ).

The receiving portion 32 is formed in a substantially cylindrical shape having small diameter portions on the front end side and the rear end side, and receives the rear end portion of the first biasing member 40 to be biased rearward. The small-diameter portion of the rear end side of the receiving portion 32 is fitted to the front end side of the support shaft 11b with play. A guided convex portion 32a is provided on the front side of the small-diameter portion.

The guided convex portion 32a is a projection that protrudes radially outward from the outer peripheral surface of the maximum diameter portion of the receiving portion 32 on the center side in the front-rear direction and extends rearward. The rearmost end of the guided projection 32a is formed to have a semicircular cross-section that fits into the front recess 11b11 and the rear recess 11b12 of the rear shaft portion 11 (see FIG. 4).
A plurality of guided projections 32a (two at equal intervals in the illustrated example) are provided at intervals in the circumferential direction so as to correspond to the plurality of guide grooves 12a3 on the barrel 10 side.

The first biasing member 40 is, according to the illustrated example, a compression coil spring, which is annularly attached to the small-diameter portion on the front end side of the receiving portion 32 and biases the slider 30 rearward with respect to the rotation shaft portion 12 . ing.

The spring load of the first biasing member 40 is 40 to 50 gf when the amount of deflection of the spring (approximately the amount of movement of the slider 30) is limited to about 0.3 mm by the length and angle of the cam slope 31a. is set to be within the range of
When the spring load is smaller than the range, the front end side of the writing lead 20 bends due to an unintended small writing pressure. Further, when the spring load is larger than the above range, the writing pressure for bending the front end side of the writing lead 20 becomes significantly large. Therefore, in a preferred example of the present embodiment, the spring load of the first biasing member 40 is set as described above.

In addition, the retraction operation mechanism 50 includes a connected member 51 to which the rear end side of the writing lead 20 is connected, a second biasing member 52 that biases the connected member 51 backward against the barrel 10, A supporting rotor 53 that supports the connected member 51 from its rear side so as to be slightly movable back and forth and rotates forward and backward by a predetermined operation; 55, and a knock portion 54 that moves forward by an external force and pushes the support rotor 53. As shown in FIG.
The retractable operation mechanism 50 can be operated in both the fixed support state (see FIGS. 1(a), 1(b) and 5) and the tiltable support state (see FIGS. 1(c) and 6). It functions to make the writing lead 20 protrude from the front end of the slider 30. - 特許庁

The connected member 51 includes a small-diameter cylindrical fitting support portion 51a press-fitted into the writing core 20 (specifically, the rear end portion of the ink containing tube 22) from the rear side, and a rear end side of the fitting support portion 51a. A collar portion 51b annularly protruding radially outward, a cylindrical portion 51c extending rearward from the collar portion 51b in a substantially cylindrical shape, and a rear end side of the cylindrical portion 51c having an uneven shape with respect to the support rotor 53. and a loosely fitting portion 51d that is loosely fitted into the housing (see FIG. 7).

More specifically, the loose fitting portion 51d is formed by an annular recess 51d1 provided on the outer peripheral surface of the cylindrical portion 51c on the rear end side and an annular protrusion 51d2 projecting radially outward on the rear side of the annular recess 51d1. It is inserted into the front end side of a support rotor 53, which will be described later, and is fitted with play (see FIG. 7).

Also, the third biasing member 55 is a compression coil spring annularly attached to the cylindrical portion 51c of the member 51 to be connected. The third urging member 55 has its front end in contact with the flange 51b of the connected member 51 and its rear end in contact with the front end of the support rotor 53 so that it is compressed and deformed.
When the writing lead 20 and the connected member 51 retreat due to the backward force component, the third biasing member 55 provides resistance to this retreat, and when the backward force component is removed, The writing lead 20 and the connected member 51 are elastically advanced to their original positions.

The support rotor 53 is a substantially cylindrical member that extends in the front-rear direction, and has a loosely fitted portion 53a on the inner surface of the peripheral wall on the front end side for connecting the loosely fitted portion 51d of the member to be connected 51 (see FIG. 7). . A plurality of loose fitting portions 53a (two at equal intervals in the illustrated example) are provided in the circumferential direction.
Each of the loosely fitted portions 53a is fitted with play in the annular concave portion 51d1 on the front side of the loosely fitting portion 51d, and is fitted with play in the annular convex portion 51d2 on the rear side of the loosely fitting portion 51d. It is composed of a matching concave portion 53a2 (a through hole according to the illustrated example).

Further, a plurality of projections 53b having inclined surface portions 53b1 at the rear ends are provided at intervals in the circumferential direction behind the loosely fitted portion 53a of the support rotor 53. As shown in FIG. The rear end side of the support rotor 53 is inserted into the knock portion 54 .
The knock portion 54 is a bottomed cylindrical member with a closed rear end portion, and is provided with a cam slope 54a that can move back and forth but cannot rotate at its front end portion. It has a ridge 54b that fits in and can move forward and backward.
A mechanism for moving the support rotor 53 forward, rotating it, and locking it, or releasing the locked state and retracting the support rotor 53 with these configurations is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2004-209881. It is possible to apply the described invention.

Next, the characteristic functions and effects of the writing instrument 1 configured as described above will be described in detail.
FIG. 1(a) shows a state in which the writing section 21 is retracted into the barrel 10 with the slider 30 at the forward position. Although not shown, the writing unit 21 can be retracted into the barrel 10 even when the slider 30 is in the retracted position.

In the recessed state, when the knock portion 54 is pushed forward, the writing portion 21 is locked in a state of protruding from the front end of the barrel 10 by the action of the support rotor 53, the fixed cam inclined surface 11a3, the cam inclined surface 54a, and the like. (See FIG. 1(b)).

In this way, when the slider 30 is in the forward position and the writing part 21 protrudes, the large-diameter part 31c of the slider 30 is engaged with the annular engaging part 12a1 on the barrel 10 side as shown in FIG. Fit together. In this state, since the writing portion 21 of the writing lead 20 is in contact with the contact support surface 31d of the slider body portion 31, the writing lead 20 is held in a fixed and supported state without tilting.
According to this fixed support state, a writer who writes while holding the writing instrument 1 can obtain a hard writing feeling similar to that of a normal writing instrument.

3(a)(b) and FIGS. 4(a) to 4(c), when the rotating shaft portion 12 is rotated in the fixed support state, the writing core 20 is rotated. It becomes a tiltable support state in which tiltable support is possible.
Specifically, in the fixed support state, the guided convex portion 32a of the slider 30 is fitted into the front concave portion 11b11 of the cam portion 11b1 of the rear shaft portion 11, as shown in FIG. 4(a).
In this state, when the rotating shaft portion 12 is rotated in a predetermined direction relative to the rear shaft portion 11, the guided convex portion 32a comes out of the front concave portion 11b11 and slides obliquely rearward in the circumferential direction on the inclined surface portion 11b13 (Fig. 4(b)).
When the rotating shaft portion 12 is further rotated in the predetermined direction, as shown in FIG. 4C, the guided convex portion 32a fits into the rear concave portion 11b12 and is held in a tiltable supported state.

In this tiltable support state, as shown in FIGS. 6(a) and 6(b), a radial direction of the slider 30 is provided between the annular engaging portion 12a1 of the rotary shaft main body 12a and the small diameter portion 31b of the slider main body portion 31. A gap s is secured to allow fine movement of the .

Therefore, in this tiltable support state, when the writing portion 21 is pressed against the writing surface A and a radial force is applied to the writing portion 21, the radial force is applied to the slider main body via the contact support surface 31d. The slider 30 tilts while moving forward relative to the shaft tube 10 with the cam slope 31a in sliding contact with the sliding contact portion 12a11 (see FIG. 6B).

When the writing lead 20 bends by tilting the front end side as described above, the outer peripheral portion of the writing lead 20 comes into contact with the contact support portion 11c, and the amount of bending is appropriately regulated.
Therefore, a writer who writes while holding the writing instrument 1 can obtain a unique writing feeling like a brush with a flexible tip.

Also, when a relatively strong backward force is applied to the writing lead 20, the writing lead 20 and the connected member 51 move slightly backward against the elastic force of the third biasing member 55. As shown in FIG.
For this reason, for example, when the writing pressure suddenly increases during writing, or when the writing pressure of the writer is originally strong, a minute impact applied to the writing lead 20 due to the writing will be reduced to the second. It can be absorbed by the biasing force of the third biasing member 55 and can give the writer a good writing feeling.

In order to return the tiltable support state to the fixed support state, the rotating shaft portion 12 is rotated in the opposite direction to move the slider 30 forward so that the large diameter portion 31c of the slider main body portion 31 is engaged with the annular engaging portion 12a1. (See FIG. 5).

Further, in order to retract the protruding writing part 21 into the barrel 10, the knocking part 54 may be knocked again.

In the above-described embodiment, as a particularly preferable mode, the cam slope 31a for tilting the writing lead 20 is provided on the slider 30 side, and the sliding contact portion 12a11 that makes sliding contact with the cam slope 31a is provided on the barrel 10 side. As another example, it is also possible to provide a cam slope on the shaft cylinder side and provide a sliding contact portion that slides on the cam slope on the slider side.

In the above-described embodiment, as a particularly preferable mode, the connected member 51 is connected to the supporting rotor 53 so as to move slightly back and forth. It is also possible to adopt a mode in which it is connected to the support rotor 53 .

In addition, although the above-described embodiment constitutes a ballpoint pen as a preferred example of the present invention, the present invention can also constitute writing instruments other than ballpoint pens, such as felt-tip pens, felt-tip pens, marker pens, calligraphy pens, and the like.

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.

10: Axle tube 11: Rear shaft portion 11a: Rear shaft main body 11b: Support shaft 11c: Contact support portion 12: Rotating shaft portion 12a: Rotating shaft main body 12a1: Annular engagement portion 12b: Tip cover 20: Writing lead 21: Writing Portion 30: Slider 31: Slider body portion 31a: Cam inclined surface 31b: Small diameter portion 31c: Large diameter portion 32: Receiving portion 40: First biasing member 50: Protrusion/retraction operation mechanism 51: Connected member 52: Second attachment Force member 53: Support rotor 54: Knock part 55: Third bias member

Claims (9)

A writing instrument comprising a barrel, and a writing core housed in the barrel and having a writing part on the front end side protruding from the front end of the barrel,
switching between a fixed support state in which the writing lead is supported so as not to tilt and a tiltable support state in which the writing lead is supported so as to tilt ;
A contact support having a reduced diameter on the inner peripheral side of the barrel so as to radially receive an intermediate portion in the longitudinal direction of the bent writing lead when the writing lead is bent under writing pressure. A writing instrument characterized by having a part . 2. The writing instrument according to claim 1, wherein the dimension from the front end of said writing lead to said contact support portion is set within a range of 10 to 50 mm. A cylindrical slider that is reciprocally contained in the front end of the barrel and through which the writing lead protrudes from the front end, and a first bias that biases the slider backward with respect to the barrel. and
One of the shaft cylinder and the slider is provided with a cam slope and the other is provided with a sliding contact portion that slides on the cam slope,
In the tiltable support state, the radial force transmitted from the writing lead to the slider brings the cam slope into sliding contact with the sliding contact portion, thereby advancing the slider and the writing lead with respect to the barrel. 3. The writing instrument according to claim 1, wherein the writing instrument is tilted while tilting. A writing instrument comprising a barrel, and a writing core housed in the barrel and having a writing part on the front end side protruding from the front end of the barrel,
switching between a fixed support state in which the writing lead is supported so as not to tilt and a tiltable support state in which the writing lead is supported so as to tilt ;
A cylindrical slider that is reciprocally contained in the front end of the barrel and through which the writing lead protrudes from the front end, and a first bias that biases the slider backward with respect to the barrel. and
One of the shaft cylinder and the slider is provided with a cam slope and the other is provided with a sliding contact portion that slides on the cam slope,
In the tiltable support state, the radial force transmitted from the writing lead to the slider brings the cam slope into sliding contact with the sliding contact portion, thereby advancing the slider and the writing lead with respect to the barrel. A writing utensil characterized by being tilted while holding . A small-diameter portion and a large-diameter portion located behind the small-diameter portion are provided on the outer peripheral portion of the slider, and the slider is configured to advance and retreat between a forward position and a backward position by a predetermined operation, and the shaft An annular engaging portion is provided on the inner peripheral side of the cylinder,
The annular engaging portion is engaged with the large diameter portion at the forward position to be in the fixed support state, and the annular engaging portion secures a gap with the small diameter portion at the retracted position. 5. The writing instrument according to claim 3, wherein the tiltable support state is achieved by . The shaft cylinder includes a rear shaft portion and a rotating shaft portion rotatably connected to the front side of the rear shaft portion, and rotates the rotating shaft portion to advance or retreat the slider. 6. The writing instrument according to claim 5, wherein the rotating shaft portion and the slider are engaged with the rear shaft portion. A member to be connected to which the rear end side of the writing lead is connected is provided in the barrel, and the member to be connected is supported so as to move slightly back and forth. 1. The writing instrument according to any one of the items. 6. In any one of the fixed support state and the tiltable support state, a retraction operation mechanism is provided for retracting the writing lead from a front end portion of the slider. Writing implements described in paragraph. The writing instrument according to any one of claims 1 to 8, wherein the writing core is a ballpoint pen refill having a ballpoint pen tip as the writing portion on the front end side.

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