TWI619621B - Writing tools - Google Patents

Abstract

The invention provides a writing instrument which effectively protects the front side portion of a writing core protruding from the front end of a shaft cylinder. The writing instrument of the present invention includes a shaft cylinder (10) and a pen holder (20) inserted through a front opening portion (11a) of the shaft cylinder (10) and protruding forward from a front end of the shaft cylinder (10); And writing core (30), which are in contact with the inner peripheral surface of the pen holder (20), are inserted into the pen holder (20), and are supported on the shaft cylinder so as to protrude forward from the front end of the pen holder (20) (10), wherein a movement direction conversion mechanism is provided between the shaft cylinder (10) and the pen holder (20), and the movement direction conversion mechanism applies a force in a direction outside the diameter of the shaft cylinder of the pen holder (20), The pen holder (20) is advanced relative to the barrel and the writing core.

Description

Writing tools

The present invention relates to a writing tool such as a mechanical pencil, a ballpoint pen, a signature pen, a marker pen, a correction pen, and the like, with a writing portion protruding from the front end of a shaft cylinder.

Conventionally, as described in Patent Document 1, this type of invention includes a mechanical pencil including a barrel (40) and a pen holder (slider 10) inserted through a front opening of the barrel (40), and Protrudes forward from the front end of the shaft cylinder (40); and a writing core (swing-out mechanism 20, core storage 22, etc.) is inserted into the pen holder (slider 10), and the lead core (1) is removed from the The tip of the pen holder (slider 10) projects forward.

Generally, as in the aforementioned mechanical pencil, the shaft cylinder (40) is held in a state inclined at an appropriate angle, and the lead (1) protruding from the pen holder (slider 10) is pressed against the paper surface to write.

Therefore, when an axial pressing force and a direction intersecting the axial direction are applied to the lead core (1), the lead core (1) may be broken due to the aforementioned pressing force.

Furthermore, as mentioned above, not only mechanical pencils, but also ballpoint pens (especially needle-shaped ballpoint pens with a slender tip) and signature pens, markers, correction pens, etc. may produce the front side of the writing core protruding from the clip Damage (such as lead core, etc.).

Patent Document 1: Japanese Patent Publication No. 2003-11582

The present invention has been made in view of the foregoing circumstances, and an object thereof is to provide a writing instrument capable of effectively protecting a front portion of a writing core protruding from a front end of a shaft cylinder.

One means for solving the above-mentioned problems is a writing instrument including: a shaft cylinder; a pen holder inserted through a front opening of the shaft cylinder and protruding forward from a front end of the shaft cylinder; and a writing core and the pen The inner peripheral surface of the clip is contacted and inserted into the pen holder, and is supported on the shaft cylinder so as to protrude forward from the front end of the pen holder, wherein a movement direction conversion mechanism is provided between the shaft cylinder and the pen holder. The movement direction conversion mechanism advances the pen holder relative to the mandrel and the writing core by a force applied in a direction outside the diameter of the mandrel of the pen holder.

Since the present invention is structured as described above, it is possible to effectively protect the front side portion of the writing core protruding from the front end of the shaft cylinder.

1, 2, 3, 4, 5‧‧‧ writing instruments

10, 10 ’, 10” ‧‧‧ shaft cylinder

11c‧‧‧section

11a‧‧‧Front opening

11b‧‧‧ convex

11n‧‧‧section

12a‧‧‧Concave

12b‧‧‧section

13‧‧‧ Pen clip force member

20, 20 ’, 20”, 60‧‧‧ pen holders

20a, 11a ’, 21” ‧‧‧ cam bevel

20a’‧‧‧ annular protrusion

20b‧‧‧Lead slide hole

20c‧‧‧writing core sliding hole

21‧‧‧Spring receiving department

21a‧‧‧ protrusion

22 ”‧‧‧Protection tube

23 ”‧‧‧ cam bevel

30‧‧‧writing core

31‧‧‧ Lead

32‧‧‧Lead core screw-out mechanism

32a‧‧‧ core memory

32b‧‧‧chuck

32c‧‧‧clutch ring

32d‧‧‧core interrupter

32e‧‧‧slip tube

32e1‧‧‧Expansion part

32e2‧‧‧ core powder discharge tank

32e3‧‧‧ rib

32e11‧‧‧Chamfer

32f‧‧‧Slider force member

32g‧‧‧ holding tube

32g1‧‧‧Front side holding section

32g2‧‧‧ rear side holding section

32g12‧‧‧front abutment

32g20‧‧‧ writing core support

32g21‧‧‧ raised

32g22‧‧‧ abutment department

32h‧‧‧ core reservoir force applying member

32i‧‧‧Lead core introduction tube

32j‧‧‧Eraser

32k‧‧‧Top cover

32m‧‧‧ connecting member

33‧‧‧ Buffer

40‧‧‧ advance and retreat components

42‧‧‧ segment

43‧‧‧ engagement protrusion

50‧‧‧ writing core force member

50’‧‧‧ writing core force member

61‧‧‧Flexible piece department

61a‧‧‧cam bevel

Fig. 1 is a sectional view showing an example of a writing instrument of the present invention.

Figure 2 is an enlarged perspective view of the main part of the writing instrument.

Fig. 3 is a half cross-sectional view showing an example of a slide cylinder.

Fig. 4 is a view of the slider viewed from the front.

Fig. 5 is a half cross-sectional view showing a state in which the writing core is removed from the pen holder.

FIG. 6 (a1) is an end view taken along line (a1)-(a1) in FIG. 5, and FIG. 6 (a2) is an end view taken along line (a2)-(a2) in FIG. 5.

Fig. 7 is a plan view showing the engagement relationship between the advancing and retracting member and the shaft cylinder.

Fig. 8 is an enlarged sectional view of the front end side of the writing instrument. Fig. 8 (a) shows a normal writing state, and Fig. 8 (b) shows a state in which the pen holder is advanced. In addition, in this figure, only The moving part in Figure 8 (a) is shaded to show it in Figure 8 (b).

Fig. 9 is an overall cross-sectional view showing a state in which the pen holder is advanced for the writing instrument.

Fig. 10 is a cross-sectional view of the main part of the writing instrument. Fig. 10 (a) shows a normal state, and Fig. 10 (b) shows a state in which the writing core is pushed backward. In addition, in this figure, only a part moved with respect to FIG. 10 (a) is hatched to show it in FIG. 10 (b).

11 (a) to (c) are sectional views each showing a modified example of the cam slope.

FIG. 12 is an enlarged front sectional view showing another example of the writing instrument of the present invention. FIG. 12 (a) shows a normal writing state, and FIG. 12 (b) shows a state in which the pen holder is advanced. In addition, in this figure, only a part moved relative to FIG. 12 (a) is hatched to show it in FIG. 12 (b).

Fig. 13 is a sectional view of a main part showing another example of the writing instrument of the present invention.

Fig. 14 is a sectional view of a main part showing another example of the writing instrument of the present invention.

Fig. 15 is a sectional view of a main part showing another example of the writing instrument of the present invention.

Fig. 16 is a perspective view showing another example of the pen holder.

A first feature of this embodiment is as follows: a writing instrument including: a barrel; a pen clip inserted through a front opening of the barrel and protruding forward from a front end of the barrel; and a writing core, and The inner peripheral surface of the pen holder is in contact with the pen holder, is inserted into the pen holder, and is supported by a shaft cylinder so as to protrude forward from the front end of the pen holder. A movement direction conversion mechanism is provided between the shaft cylinder and the pen holder. The movement direction conversion mechanism advances the pen holder relative to the mandrel and the writing core by a force applied in a direction outside the diameter of the mandrel of the pen holder (refer to FIG. 8).

According to this configuration, a force in a direction outside the diameter of the barrel is applied to the writing core from the pen holder by pen pressure or the like. If the force is applied to the pen holder, the pen holder moves forward relative to the barrel and writing core, covering the front side of the writing core for protection. Therefore, damage to the writing core and the like can be prevented.

In this way, the invention having the aforementioned features is the one which the conventional technology does not have, that is, the front side portion of the writing core is effectively protected by a pen holder advanced by the pen pressure.

In addition, as a specific example of the “movement direction conversion mechanism”, a cam inclined surface (inclined surface) may be used to convert the movement in the outer diameter direction of the barrel of the pen holder into the movement in the forward direction of the barrel, and The link member is used to convert the movement in the outer diameter direction of the barrel of the pen holder into the movement in the forward direction of the barrel, and the like.

Further, as a specific example of the aforementioned "writing lead", a writing lead for a mechanical pencil (sometimes referred to as a replacement lead for a mechanical pencil) may be cited in which a lead core is inserted into a pen holder and protrudes forward from the front end of the pen holder. ), A ballpoint pen writing core (refill for ballpoint pen) with the tip of the tip inserted into the pen holder and protruding forward from the front end of the pen holder, inserted into the pen holder with the writing portion forward from the front end of the pen holder The core of a prominent signature pen or marker, or a writing core for a correction pen.

In addition, the means for returning the pen holder to the initial position during advancement is not particularly limited, and may be, for example, a state in which a pen holder urging member is provided in such a manner that the pen holder is urged backward with respect to the shaft cylinder; And providing a joystick member connected to the pen holder and exposed to the outside of the barrel, and manually operating the joystick member to return the pen holder to an initial position.

As a second feature, in addition to the first feature described above, the motion direction conversion mechanism is further provided with a cam inclined surface provided on at least one of the shaft barrel and the pen holder, and the pen holder can advance and retreat through the cam inclined surface. The cam is inclinedly engaged with the shaft cylinder, and the cam inclined surface is inclined to advance the clip by slidingly contacting the other side with the force applied to the outside of the diameter of the shaft cylinder of the clip.

According to this configuration, a force outside the shaft diameter is applied to the writing core protruding forward from the pen holder, and if the force is applied to the pen holder, the cam inclined surface is slid into contact with the other side with respect to the one, so that the pen holder Advance relative to the writing core.

In addition, the configuration "where a cam bevel is provided on at least one of the shaft barrel and the pen holder and the pen holder is engaged with the shaft barrel forward and backward via the cam bevel" includes in the outer periphery of the pen holder. A cam inclined surface with a diameter increasing toward the front is provided, and the pen holder is engaged with the front opening portion of the shaft cylinder through the cam inclined surface so as to advance and retreat (refer to FIG. 8); A cam inclined surface with an enlarged diameter, and the pen holder can be engaged with the front opening of the barrel through the cam inclined surface so as to advance and retreat (refer to FIG. 12); and a rear end portion of the pen holder is provided to expand toward the rear. Diameter cam inclined surface, and the pen holder can be engaged with the front edge of the shaft cylinder forward and backward through the cam inclined surface (see FIG. 13).

The "cam slope" includes a straight inclined surface (see Fig. 8), a convex curved surface (see Fig. 11 (a)), and a concave curved surface (see Fig. 11 (b). )) And intermittent inclined surfaces (see Figure 11 (c)).

As a third feature, in addition to the above-mentioned second feature, the cam inclined surface is provided at least one of an outer peripheral surface of the pen holder and a front opening portion of the shaft cylinder so as to be enlarged in diameter toward the front, and is opposed to Slide on the other of the one to advance the pen holder.

As a fourth feature, in addition to any of the above-mentioned first to third features, the pen holder is further provided with a feature that the pen holder is set forward and backward in a forward position with respect to the shaft cylinder and the writing core and before the advance Is formed between the initial positions of the shaft cylinder and the front opening portion of the shaft cylinder so as to be unable to move in the radial direction of the shaft cylinder at the aforementioned initial position, and at the advance position, It fits into the said front opening part in the state which has a clearance | gap in the radial direction of a shaft cylinder.

As a fifth feature, in addition to any one of the first to fourth features described above, it is also provided with a feature that a pen clip urging member is provided so as to urge the pen clip backward with respect to the shaft cylinder.

According to this configuration, when the force in the crossing direction of the writing core is released, the pen holder can be automatically retracted by the force of the pen holder urging member.

As a sixth feature, in addition to any one of the first to fifth features described above, there is also a feature that the writing core is supported in a radial direction of the shaft cylinder relative to the shaft cylinder at a rear side than the pen holder. Flick.

As a seventh feature, in addition to any of the above-mentioned first to sixth features, the following features are also provided in the shaft barrel: a section portion for reducing the diameter of the front side; and a writing core supporting inclined surface, The portion further expands toward the front side from the rear side, and the writing core supporting portion is disposed in the shaft cylinder between the segment portion and the writing core supporting inclined surface, and is allowed to move slightly along the rear and the radial direction of the shaft cylinder.

As an eighth feature, in addition to any one of the first to seventh features described above, the writing core is a mechanical pencil having a lead core and a lead core unscrew mechanism that rotatably holds the lead core. A writing core is supported in the shaft cylinder in such a manner that the aforementioned lead core that is screwed out is inserted into the aforementioned pen holder.

Here, the aforementioned "writing core for mechanical pencils" can be applied: a structure in which a lead core is rotated out by an ejection operation; a structure in which a lead core is rotated out by a rotation operation; a rotation by an operation of shaking the writing instrument The structure of a lead core; and the well-known writing core of a mechanical pencil (replacement core for a mechanical pencil). In addition, the "writing core for mechanical pencils" also includes a means for protruding by a pen pressure. A writing lead for a mechanical pencil with a mechanism for rotating a lead core, and a writing lead for a mechanical pencil provided with a mechanism for rotating a protruding lead by a key operation or the like.

According to the foregoing configuration, when a force in a cross direction is applied to the lead in a state where the lead is projected forward from the pen holder, the lead can be covered and protected by the pen holder in advance.

As a ninth feature, in addition to the eighth feature described above, the lead core unscrewing mechanism is provided with a core storage device that has a lead core built in and maintains it to advance and retreat within a shaft cylinder; a chuck, and the The front end of the core storage is connected to and holds the lead core; the clutch ring is fitted to the chuck so as to be disengaged to the rear side; the core breaker elastically holds the lead core on the front side than the clutch ring; the holding cylinder The chuck and the clutch ring can be built in forward and backward, and the core interrupter can be built in in the forward and backward direction; and the core storage force applying member applies a force to the core storage to the rear with respect to the holding cylinder. The holding cylinder is provided with a rear contact portion that receives the clutch ring from the rear side, and a front contact portion that receives the clutch ring when moving forward from the front side.

As a tenth feature, in addition to the ninth feature described above, the pen holder is further fitted to the front end side of the holding cylinder so as to be able to advance and retract.

With this configuration, the pen holder can be moved forward and backward more smoothly.

As the eleventh feature, in addition to the above-mentioned ninth or tenth features, it also has the following features: a slider is provided between the chuck and the core interrupter, and can advance and retreat in a state of being inserted with a lead core And a cylinder biasing member for biasing the cylinder backward with respect to the holding cylinder.

According to this configuration, for example, it is possible to prevent the lead core broken between the chuck and the core interrupter from being blocked by a slide tube therebetween.

As a twelfth feature, in addition to any one of the first to eleventh features described above, In addition, it also has a feature that a writing core urging member for urging the writing core forward with respect to the shaft cylinder is provided in the shaft cylinder, and the writing core resists the rearward force by a predetermined force higher than a predetermined pen pressure. The writing core urging member retreats with the application of force.

According to this configuration, if an excessive pressing force is applied to the writing core toward the rear, the writing core and the advancing and retracting member retract against the urging force of the writing core urging member. This can prevent the writing core from being damaged.

In addition, examples described later also disclose independent inventions that do not include a part of the above-mentioned features and only include the following constituent elements as necessary elements.

That is, the independent invention is a lead core unwinding mechanism, which includes: a chuck that advances and releases the clamped lead core; and a core interrupter that is held at a position farther away from the chuck The lead core is inserted through the chuck, and the lead core is unscrewed to the front of the core interrupter by the clamping and releasing and advancing and retreating movements of the chuck. A slide cylinder that advances and retreats between the interrupters in a state covering the outer periphery of the lead core, and an urging member that urges the slide cylinder backward with respect to the core interrupter to advance and retreat the chuck and the slide integrally. And, a core powder discharge groove penetrating in the axial direction is provided on the outer peripheral surface of the slide drum.

According to this configuration, it is possible to prevent the lead core from being broken due to a drop impact or the like between the chuck and the core interrupter by the slider, and the core powder discharge groove is discharged along the axial direction of the slider to slide the slider. The generated core powder can prevent the core powder from being fixed to the periphery of the drum and causing malfunction.

In addition, in the embodiment described later, an independent invention is disclosed that does not include a part of the above-mentioned features, and includes only the following constituent elements as essential elements.

That is, the writing instrument of the independent invention includes: a barrel: a pen holder that is inserted through the front opening of the barrel and protrudes forward from the front end of the barrel; and a writing core and the pen holder The inner peripheral surface of the pen is in contact with and inserted into the pen holder, and is supported to protrude forward from the front end of the pen holder. The writing instrument is configured to advance and retreat the pen holder relative to the shaft cylinder. The writing instrument is provided with a buffer. The buffer member is elastically deformed by receiving the pen clip when retracted.

According to this configuration, when the pen holder is retracted, the pen holder is received by the cushioning member, and the cushioning member is elastically deformed. Therefore, the pen holder at the time of retreating can alleviate the operation sound and the like when it comes into contact with the shaft-cylinder-side member.

[Example]

Next, a preferred embodiment having the above features will be described in detail based on the drawings.

In this specification, the axial direction of the shaft cylinder means a direction in which the centerline of the shaft cylinder extends. In addition, "front" means one side in the axial direction of the shaft cylinder and the front end direction of the writing portion. Moreover, "rear" means the side opposite to the said one side with respect to the axial direction of a shaft cylinder. In addition, "the shaft cylinder radial direction" means a direction orthogonal to the shaft cylinder axial direction. The “outer diameter direction of the shaft cylinder” means a direction away from the center of the shaft cylinder in the radial direction of the shaft cylinder. The “inner diameter direction of the shaft cylinder” refers to a direction near the center of the shaft cylinder in the radial direction of the aforementioned shaft cylinder.

As shown in FIGS. 1 and 2, the writing instrument 1 includes a shaft cylinder 10 and a pen holder 20 inserted through the front opening portion 11 a of the shaft cylinder 10 and protruding forward from the front end of the shaft cylinder 10; The writing core 30 has a lead 31 inserted through the pen holder 20 and protrudes forward from the front end of the pen holder 20; an advancing and retreating member 40 abuts against the writing core support portion 32g20 of the writing core 30 from the rear and faces The shaft cylinder 10 can advance and retreat by a predetermined amount; and the writing core urging member 50 biases the forward and backward member 40 forward with respect to the shaft cylinder 10.

In addition, in this embodiment, the writing core 30 is constituted by a plurality of members including the lead core 31, and the lead core 31 is not merely shown.

According to the example shown in the figure, the shaft cylinder 10 is formed by connecting and fixing the rear shaft cylinder 12 to the rear end side of the front shaft cylinder 11 by connection means such as screwing, fitting, and bonding, and the front end side is tapered. The shape is generally long tubular.

As another example of the shaft cylinder 10, a configuration including one tube body, a configuration in which a front end of a split body is connected to a front end side of the tube body, and a configuration including three or more tube bodies can be adopted.

A front side opening portion 11a is provided on the front end side of the shaft cylinder 10 for inserting a pen holder 20 described later and protruding forward. In the inner peripheral surface of the shaft cylinder 10, the front-side opening portion 11a is reduced in diameter than the rear-side portion thereof, and the front end of the pen holder urging member 13 is received through the rear-end surface inside the reduced-diameter portion.

According to the example shown in the figure, the front-side opening portion 11a is an inner peripheral surface of a cylindrical hole substantially parallel to the axis of the shaft cylinder, and a front edge portion is provided with a portion for reducing the distance from the cam slope 20a of the pen holder 20 Friction resistance convex portion 11b.

In addition, on the inner peripheral surface of the shaft cylinder 10, a ring-shaped section 11 c having a reduced diameter on the front side is provided on the rear side (specifically, on the rear side than the spring receiving portion 21) of the pen holder 20. This section 11c receives the protrusion 32g21 of the writing core 30 mentioned later from the front, and restricts the writing core 30 as a whole from moving forward.

In addition, on the inner peripheral surface of the shaft cylinder 10, a ring-shaped step portion 11n having a front-side reduced diameter is provided on the rear side than the step portion 11c. This segment portion 11n abuts so as to receive the front end of the advancing and retracting member 40 to be described later from the front, thereby restricting the advancing and retracting member 40 from moving forward.

In addition, a recessed portion 12 a recessed in the outer diameter direction of the shaft cylinder and extending in the axial direction of the shaft cylinder is provided on the peripheral wall of the shaft cylinder 10.

As shown in FIG. 7, the concave portion 12 a is provided with a hole having a rectangular shape when viewed in a plane through the peripheral wall of the front end side of the peripheral wall of the rear shaft cylinder 12, and the front end side of the rear shaft cylinder 12 including the hole is inserted Into the front shaft cylinder 11. The axial length of the recessed portion 12a in the axial direction of the shaft is appropriately set so that the advancing and retracting member 40 can be advanced and retracted by a predetermined amount.

According to the example shown in the figure, the pen clip urging member 13 is a compression coil spring with the pen clip 20 inserted in the center gap, and biases the pen clip 20 backward through the spring receiving portion 21.

In addition, as another example of the pen clip urging member 13, it is possible to use an elastic material such as an elastic material resin and rubber, use an elastic body such as a plate spring, and use the pen clip urging member 13 from The appearance of the tension spring behind it.

The pen holder 20 is engaged with the front opening portion 11 a (more specifically, the convex portion 11 b) through the cam inclined surface 20 a at the outer periphery of the pen holder 20 so as to advance the position with the barrel 10 and the writing core 30 before the Advance and retreat between the initial positions before the advance.

In addition, the pen holder 20 makes the annular cam inclined surface 20a contact the front opening portion 11a of the shaft cylinder 10 over the entire circumference at the aforementioned initial position (refer to FIG. 8 (a)), thereby making it impossible to move in the radial direction of the shaft cylinder. Closed to the front opening 11a. In addition, in the pen holder 20, the outer diameter of the rear side portion than the cam inclined surface 20a is smaller than the inner diameter of the front opening portion 11a. Therefore, in the aforementioned forward position (see FIG. 8 (b)), The state of the clearance that moves in the radial direction is fitted to the aforementioned front side opening portion 11a.

A spring receiving portion 21 described later is integrally fixed to the rear end side of the pen holder 20. When the pen holder 20 and the spring receiving portion 21 are forced backward by the pen holder biasing member 13 in the shaft cylinder 10 and retracted from the forward position, the buffer member 33 made of an elastic material is received.

If described in detail, the pen holder 20 is a substantially cylindrical member penetrating the front side opening portion 11a in the front-rear direction, and has a sliding contact with a front edge of the front side opening portion 11a (in detail, the convex portion 11b) on its outer peripheral portion. Ring cam inclined surface 20a.

The cam inclined surface 20 a is formed in a conical shape with an enlarged diameter toward the front, and is arranged to be in sliding contact with the front opening portion 11 a (more specifically, the convex portion 11 b). The movement direction conversion mechanism (movement direction conversion member) that the pen holder 20 advances relative to the barrel 10 and the writing core 30 with force.

Furthermore, according to the example of the figure, the portion of the pen holder 20 which is closer to the front side than the cam inclined surface 20 a is reduced in diameter.

In addition, the pen holder 20 has a lead slide hole 20b which can slide in contact with the outer peripheral surface of the lead 31 on the front side than the cam inclined surface 20a, and has an enlarged diameter on the rear side than the lead slide hole 20b. The writing core sliding hole 20c can be slidably contacted with the writing core 30.

The lead slide hole 20b is a hole having an inner diameter slightly larger than the outer diameter of the lead 31 in order to contact or approach the outer peripheral surface of the lead 31. The lead slide hole 20b extends rearward from the front end of the pen holder 20 and is inserted in The writing core slide hole 20c.

The writing core slide hole 20c is a hole having an inner diameter slightly larger than the outer diameter of the front side holding portion 32g1 on the front end side of the writing core 30 in order to contact or approach the outer peripheral surface on the front end side of the writing core 30.

In addition, the writing core slide hole 20c shown in the figure is formed in a stepped shape with a reduced diameter in accordance with the shape of the outer peripheral surface of the front side holding portion 32g1. As another example of the writing core slide hole 20c, it slides sideways with the front end of the writing core 30 Next, it can also be cylindrical without steps.

The pen holder 20 configured as described above is engaged with the front side opening portion 11 a of the shaft cylinder 10 through the cam inclined surface 20 a on the outer periphery, and is inserted into the shaft cylinder 10. In the barrel 10, a spring receiving portion 21 is connected and fixed to the outer peripheral surface of the rear end side of the pen holder 20 by connection means such as fitting.

The spring receiving portion 21 has an outer diameter larger than the outer diameter of the rear end side of the pen holder 20 and In addition, the cylindrical member having a gap with respect to the inner peripheral surface of the shaft cylinder 10 has a ring-shaped section on the front end side of the cylindrical member abutting against the rear end of the pen clip urging member 13, The rear is stressed and received by the buffer 33 from the rear.

The spring receiving portion 21 can be slightly inclined with respect to the shaft center through the gap (see FIG. 9).

On the rear end portion of the spring receiving portion 21, a plurality of protrusions 21a (see FIGS. 5 and 6 (a1)) that protrude rearward of the shaft cylinder and partially press the buffer member are provided at regular intervals in the circumferential direction.

In addition, the cushioning member 33 is a ring-shaped member including an elastic material such as rubber and an elastic material resin. The cushioning member 33 is annularly fitted to the outer periphery of the holding cylinder 32g described in detail later, and is sandwiched between the rear end surface of the spring receiving portion 21 and the writing core. The front end surface of the portion 32g20 is elastically deformed.

In addition, as for the cushioning member 33 illustrated in the figure, as an especially preferable aspect, an O-ring of the aforementioned material is used, and as another example, a sponge-like synthetic resin foam or the like may be used.

In addition, as another example of the cushioning member 33, a coil spring having a lower elastic force than the pen clip biasing member 13 can be used.

In addition, the writing lead 30 is a writing lead for a mechanical pencil having a lead lead 31 and a lead lead-out mechanism 32 that holds the lead lead 31 in a rotatable manner. The lead lead 31 is inserted into the pen holder 20 so that the lead lead 31 is screwed out. Arranged in the shaft cylinder 10.

The lead 31 is a well-known lead for a mechanical pencil in a long cylindrical shape.

The lead-screw-out mechanism 32 includes a core storage 32a with a lead core 31 built therein and holding the lead core 31 within a predetermined amount within the barrel 10, and a chuck 32b connected to the front end of the core storage 32a and clamped. Hold the lead 31 forward and release it; the clutch ring 32c to disengage to the rear side It is fitted into the chuck 32b in a separate manner; the core interrupter 32d holds the lead core loosely on the front side than the chuck 32b; the slide 32e is located between the chuck 32b and the core interrupter 32d, and It can advance and retreat with the lead core 31 inserted; the slider biasing member 32f biases the slider 32e to the rear; the holding cylinder 32g contains the chucks 32b, the clutch ring 32c, and the core interrupter 32d. , The slide cylinder 32e, the slide cylinder urging member 32f, and the like; and the core reservoir urging member 32h, which urges the core reservoir 32a backward with respect to the holding cylinder 32g.

The core stocker 32 a is formed in a long cylindrical shape capable of accommodating a plurality of lead cores 31, and the rear end portion thereof is arranged near the rear end opening portion of the shaft cylinder 10. The core reservoir 32a is molded from a synthetic resin material so as to be able to flex flexibly.

To the rear end of the core reservoir 32a, a lead introduction pipe 32i that leads the lead core 31 from the rear of the shaft cylinder 10 into the core reservoir 32a is connected. An eraser 32j for blocking the rear end opening of the lead introduction pipe 32i is detachably connected to a rear side of the lead introduction pipe 32i, and an ejection cover 32k covering the eraser 32j from the rear is detachably connected. The rear end side of the ejection cover 32k protrudes rearward from the rear end of the shaft cylinder 10 so that an ejection operation can be performed.

A connecting member 32m is integrally connected to the tip of the core stocker 32a.

The connecting member 32m is a substantially cylindrical member fixed to the front end of the core stocker 32a and the lead 31 is inserted therethrough. The rear end side of the chuck 32b is fixed to the front end, and the flange portion at the center side in the front-back direction is fixed. Receiving the rear end of the core reservoir urging member 32h.

In addition, as another example, the connection member 32m may be omitted, the rear end side of the chuck 32b is directly connected to the front end side of the core stocker 32a, and the core storage is directly received through the front end edge of the core stocker 32a. The rear end of the force applying member 32h.

The chuck 32b is formed of a synthetic resin material or a metal material that can be elastically bent, A plurality of (for example, about 2 to 4) claws arranged in the same core shape around the lead core 31 are provided, and the lead core 31 is clamped by bending the claws in the direction of the shaft cylinder diameter. The lead 31 cannot be released by elastically recovering the claws.

The chuck 32b includes a front end portion including the claw portion and is inserted into the holding cylinder 32g, and the outer diameter portion of the front end side of the claw portion is larger in diameter than the rear portion.

The clutch ring 32c is a substantially cylindrical member, and is engaged with an inner peripheral surface of a holding cylinder 32g described later so as to advance and retreat by a predetermined amount.

The clutch ring 32c is fitted to the plurality of claws of the chuck 32b from the rear side, and is maintained in a state of closing the plurality of claws. When the clutch ring 32c advances with the chuck 32b, the clutch ring 32c is locked to the holding cylinder 32g and is removed from the plurality The claws are relatively backward.

The chuck 32b and the clutch ring 32c may have a well-known structure.

The core interrupter 32d is a cylindrical member including an elastomer such as a synthetic rubber and an elastic material resin, and is fitted into the front end side of the holding cylinder 32g in a non-advancing and retracting manner, and elastically grasps the lead core 31 inserted through the inside.

The slide cylinder 32e is a substantially cylindrical member that receives the rear end of the slide cylinder urging member 32f through a segment on the outer peripheral surface and inserts the lead 31 with a gap in the center portion. The slide cylinder 32e receives rearwardly through the slide urging member 32f. The force abuts against the front end of the chuck 32b. The inner peripheral surface of the slide cylinder 32e has a cylindrical shape that is continuous over the entire circumference, and has an inner diameter that is close to or in contact with the outer peripheral surface of the lead core 31.

In addition, the rear end side of the slide cylinder 32e is enlarged in diameter from the front side, and a core powder discharge groove 32e2 for discharging the core powder is formed in the enlarged diameter portion 32e1.

The core powder discharge groove 32e2 is continuous in the axial direction so as to penetrate the peripheral wall of the enlarged diameter portion 32e1 in the axial direction. As shown in FIG. 4, a plurality of core discharge grooves 32e2 are provided at a certain interval in the circumferential direction of the slide drum 32e. The width and depth of the slide drum 32e are appropriately set so that the core powder moves in the axial direction.

A longitudinal rib shape is formed between adjacent core powder discharge grooves 32e2 in the circumferential direction, and a chamfered portion 32e11 is provided at the front end side of the longitudinal rib portion, which is inclined forward and inclined in the axial core direction. When the slide cylinder 32e moves forward and backward, the chamfered portion 32e11 reduces the frictional resistance with the inner peripheral surface of the holding cylinder 32g. In addition, the front end surface of the enlarged diameter portion 32e1 functions as a receiving portion of a rear end seat portion of the receiving cylinder urging member 32f.

In Fig. 3, reference numeral 32e3 is a rib fitted to the inner peripheral surface of the rear end side of the cylinder urging member 32f.

The slide cylinder urging member 32f is a compression coil spring located annularly around the lead core 31. The front end of the slide urging member 32f is locked in the holding cylinder 32g, and the rear end thereof abuts on the slide cylinder 32e.

As another example of the cylinder urging member 32f, an elastic body including an elastic material resin or rubber, and a tension spring that tensions the cylinder 32e to the rear may be used.

The holding cylinder 32g is integrally formed by a front side holding portion 32g1 inserted into the pen holder 20 forward and backward and a rear side holding portion 32g2 integrally connected to the rear side of the front side holding portion 32g1.

In addition, in this embodiment, as a particularly good production efficiency, as described above, the holding cylinder 32g is constituted by a plurality of members, and as another example, the aforementioned members may be constituted by an integral member.

The front-side holding portion 32g1 is formed in a substantially cylindrical shape having a stepped portion on the front side, and the outer peripheral surfaces of the front-end side and the rear-end side are individually slidably contacted with the inner surface of the pen holder 20 to be inserted into the writing core of the pen holder 20 In the sliding hole 20c.

The front end side of the chuck 32b, the clutch ring 32c, the core interrupter 32d, the slider 32e, and the slider biasing member 32f are inserted into the front-side holding portion 32g1.

An inner peripheral surface of the front-side holding portion 32g1 is provided with a rear-side contact portion 32g11 receiving the clutch ring 32c from the rear side and a front-side contact portion 32g12 of the clutch ring 32c when receiving the clutch ring 32c moving forward from the front side. According to the example of the figure, the rear-side abutment portion 32g11 is a front end portion of the rear-side holding portion 32g2. In addition, the front-side abutment portion 32g12 is a segment portion obtained by reducing the diameter of the front-side portion of the front-side holding portion 32g1.

The base end side of the chuck 32b is fixed to the front side of the rear side holding portion 32g2, and the front end side of the connection member 32m is inserted into the rear side so as to be able to move forward and backward.

The front end portion of the rear side holding portion 32g2 and the front side holding portion 32g1 are connected and fixed, and the rear end portion of the rear side holding portion 32g2 receives the front end of the core reservoir urging member 32h.

In addition, a writing core supporting portion 32g20 protruding outward in the radial direction is integrally connected to the outer peripheral portion of the rear side holding portion 32g2, and the above-mentioned writing core supporting portion 32g20 is fitted in a ring shape on the front side. Buffer piece 33.

The writing core supporting portion 32g20 can be slightly moved backward and radially in the shaft cylinder in a state in which the writing cylinder supporting portion 32g20 is in contact with the segment portion 11c and the writing core supporting inclined surface 41.

To explain in detail, the writing core supporting portion 32g20 includes a protrusion 32g21 capable of abutting against the segment portion 11c in the shaft cylinder 10 from the rear, and a writing core supporting the forward and backward member 40 from the front side of the protrusion 32g21. The abutting portion 32g22 that the inclined surface 41 abuts.

The protrusion 32g21 is engaged with the shaft cylinder 10 so that the writing core 30 cannot move forward with respect to the shaft cylinder 10 and moves in the radial direction of the shaft cylinder as the pen holder 20 moves forward.

To explain in detail, as shown in FIG. 2 and FIG. 6 (a2), a plurality of (four according to the example of the figure) protrusions 32g21 are provided on the outer peripheral portion of the rear side holding portion 32g2 at intervals along the shaft cylinder circumferential direction. Each of the protrusions 32g21 protrudes outward in the diameter direction of the shaft cylinder. A gap is secured between the inner peripheral surface of the shaft cylinder 10 and each of the protrusions 32g21 so that the writing core 30 can be moved radially toward the shaft cylinder. That is, the plurality of protrusions 32g21 The outer diameter is set smaller than the inner diameter of the shaft cylinder 10.

Further, the abutting portion 32g22 is provided on the rear side of the protrusion 32g21 to be integrated with the protrusion 32g21, and is formed in a convex shape that is in sliding contact with the writing core support inclined surface 41 at the front end of the advancement and retraction member 40 described later.

Thereby, according to the foregoing configuration, as shown in FIG. 9, the writing core 30 as a whole uses the protrusions 32g21 and the abutting portions 32g22 as fulcrum points, and can rotate its front side portion in a direction of the radial direction of the shaft cylinder. The rear part of the fulcrum is turned to the opposite side of the shaft cylinder in the radial direction.

In addition, according to the writing core support portion 32g20 configured as described above, since the plurality of protrusions 32g21 individually press the cushioning member 33 individually, the cushioning member 33 in the pressing portion can be largely elastically deformed.

In addition, the advancing and retracting member 40 is a substantially cylindrical member that allows the writing instrument 1 to be inserted into the center of the gap. A writing-core-supporting inclined surface 41 is formed near the inner diameter of the front end surface of the advancing and retreating member 40 toward the front, and has a diameter that expands in a substantially conical shape.

The writing core supporting inclined surface 41 is in sliding contact with the abutting portion 32g22 on the lead screwing-out mechanism 32 side, so that the tilting movement of the pen holder 20 and the lead screwing-out mechanism 32 can be easily performed.

Further, a step portion 42 for receiving the front end of the writing core urging member 50 is provided on the outer peripheral surface of the advancement and retraction member 40, and a recess portion 12a is provided on the rear side of the step portion 42 to engage with the shaft 10 side forward and backward.之 Engaging protrusions 43. The segment portion 42 is an annular segment portion that expands the diameter of the front side.

A plurality of (two in accordance with the example of the figure) engaging protrusions 43 are provided so as to individually correspond to the plurality of recesses 12 a on the shaft cylinder 10 side. As shown in FIG. 7, each of the engaging protrusions 43 is provided at an inner portion of a U-shaped notch formed in the peripheral wall of the advancing and retracting member 40. According to this configuration, the engaging protrusion 43 can be easily and flexibly elastically bent in the radial direction of the shaft cylinder, and further, as shown in FIG. An operation is performed in which the advancing and retracting member 40 is inserted into the rear shaft cylinder 12 and the engaging projection 43 is locked in the recessed portion 12a.

Each of the engaging protrusions 43 is movable in the front-back direction in the recessed portion 12 a. In a normal state, the engaging protrusions 43 are held against the front end in the recessed portion 12 a by the urging force of the writing core urging member 50 described later.

The writing core urging member 50 is attached to the outer peripheral portion of the advancing and retreating member 40 in a ring shape. The tip of the writing core abutting member 50 abuts against the section 42 on the outer periphery of the advancing and retracting member 40, and the rear end thereof abuts against the rear shaft barrel 12. The front end, that is, the segment portion 12b, applies a force to the forward and backward member 40 forward.

The elastic force of the writing core urging member 50 is appropriately set so that the writing core 30 is retracted by a backward force that is equal to or greater than a predetermined pen pressure.

In addition, the writing instrument 1 is provided with the above-mentioned four urging members. The urging force of the urging members is, in order from small to large, a roller urging member 32f, a pen holder urging member 13, and a writing core urging member. 50. Core storage force applying member 32h.

Next, the features and effects of the writing instrument 1 configured as described above will be described in detail.

First, if a pressing force is applied to the ejection cover 32k in order to protrude the lead core 31, the holding cylinder 32g prevents the writing core support portion 32g20 from abutting on the segment portion 11c and cannot move forward. In this state, as the core reservoir 32a The advancement of the chuck 32b advances the lead 31 while the lead 31 is elastically clamped by the core interrupter 32d, and the clutch ring 32c is locked on the holding cylinder 32g during the advance (detailed and detailed). In other words, the chuck 32b is released in a direction outside the diameter of the shaft cylinder by being detached for the front side contact portion 32g12).

When the aforementioned pressing force is removed, the chuck 32b is retracted and fitted into the clutch ring 32c to be contracted, and the lead core 31 is clamped again. These actions are repeated by ejection operation. Advance and protrude from the front end of the pen holder 20.

Further, when the chuck 32b is advanced, the slide 32e which is pressed by the chuck 32b to cover and protect the lead 31 also advances against the urging force of the slide urging member 32f.

The portion between the core interrupter 32d and the slide 32e in the lead 31 is covered and protected by the slide 32e, so the lead 31 can be prevented from being broken due to the fall of the writing instrument 1 or the broken lead A lead core or the like that becomes a residual core is blocked between the core interrupter 32d and the chuck 32b.

In addition, if the chuck 32b and the slide 32e are moved forward and backward repeatedly, some core powder may be generated due to the sliding contact between the chuck 32b and the slide 32e and the lead 31, but the core powder will not accumulate in the slip. The outer peripheral portion of the cylinder 32e is discharged forward or backward in the axial direction by the core powder discharge groove 32e2 on the outer periphery of the cylinder 32e. This can prevent the core powder from being fixed on the outer peripheral portion of the drum 32e, thereby preventing the advance and retreat of the drum 32e, the advance and retreat of the chuck 32b, and the like.

In addition, it is expected that the core powder finally passes through the gap of the outer periphery of the lead 31 and is discharged to the front of the pen holder 20 together with the lead 31.

Then, in a normal writing state in which the barrel 10 is inclined and pressed against the writing surface P, as shown in FIG. 8 (a), the lead 31 of the writing core 30 protruding forward from the pen holder 20 is written from The surface P receives a reaction force (writing pressure) in a direction crossing the lead core 31 (in other words, the radial direction of the shaft cylinder). At this time, when the reaction force is larger than the normal pen pressure range, the pen holder 20 receives the reaction force and causes one side of the cam inclined surface 20a of the pen holder 20 to slide in contact with the front opening portion 11a (more specifically, the convex portion 11b). It moves in the direction outside the diameter of the shaft cylinder and advances while resisting the urging force of the pen holder urging member 13. During this advancement, the writing core 30 including the lead 31 is moved along the radial direction of the shaft cylinder in a tilted manner together with the pen holder 20 and the lead screw-out mechanism 32.

In addition, the leading end side of the lead core 31 constituting the writing core 30 is covered and protected by the pen holder 20 that is advanced. (Refer to Figure 8 (b)).

When the lead 31 is removed from the writing surface P and the aforementioned reaction force is removed, the pen holder 20 is retracted by the force of the pen holder urging member 13 and returned to the initial position.

When this retreating is performed, the spring receiving portion 21 integrated with the pen holder 20 causes the rear end portion of the spring receiving portion 21 to abut the buffer member 33. The cushioning member 33 is received by the writing core supporting portion 32g20 from the rear side, and therefore elastically contracts. Therefore, it is possible to reduce the impact sound when the pen holder 20 abuts against the front opening portion 11 a of the barrel 10.

Further, during the aforementioned retreat, the spring receiving portion 21 abuts the protrusion 21 a which is divided and arranged in the circumferential direction against the buffer member 33. In addition, the writing core supporting portion 32g20 also presses the protrusions 32g21 arranged in the circumferential direction in a divided manner on the cushioning member 33. Therefore, the shock absorbing member 33 can be substantially locally contracted in the circumferential direction, and the impact sound can be effectively reduced.

In addition, as another example, a configuration in which protrusions other than those shown in the figure are in contact with the cushioning member 33, or a configuration in which the projection 21a and the projection 32g21 are omitted and a flat surface is in contact with the cushioning member 33 may be used.

In addition, the urging force of the pen holder urging member 13 is appropriately set such that the pen holder 20 does not advance under the pen pressure in the normal crossing direction of the lead 31, and the lead 31 is caused by the crossing of the lead 31. The pen holder 20 advances before the pen pressure in the direction is broken.

In addition, the overall movement of the writing core 30 during the forward movement will be described. As shown in FIG. Rotate it in the direction (upward according to Fig. 9), while turning its rear part (core reservoir 32a, etc.) toward the other side in the radial direction of the shaft cylinder.

In addition, the core reservoir 32a is elastically flexed by abutting the rear-end lead introduction pipe 32i on the inner peripheral surface of the shaft cylinder. With the overall rotation of the writing core 30, the pen holder 20 is tilted, Move forward while moving smoothly outward.

In addition, during the aforementioned rotation, the range of the axial direction of the shaft between the pen holder 20 and the connecting member 32m was kept substantially linear. Therefore, the lead core 31 does not break due to the aforementioned range being bent. In addition, as shown in FIG. 9, the portion of the lead 31 that protrudes rearward from the connecting member 32m is located in the space in the core storage 32a having an inner diameter larger than the connecting member 32m, so the lead 31 does not occur due to the core. The inner peripheral surface of the reservoir 32a comes into contact and breaks.

Next, the operation when the lead core 31 is subjected to a pressing force in the axial direction of the shaft cylinder will be described in detail.

When the lead core 31 is pressed backward with a strong force perpendicular to the writing surface P, as shown in Figs. 10 (a) and (b), the aforementioned pressing force is first applied to the inability to retreat. The chuck 32b of the lead 31 is held on the ground. Further, the pressing force applied to the chuck 32 b is transmitted to the advancing and retreating member 40 via the clutch ring 32 c, the holding cylinder 32 g, and the like, and the advancing and retreating member 40 retracts against the urging force of the writing core urging member 50.

Therefore, as shown in FIG. 10 (b), the lead 31 enters the pen holder 20, so as not to cause damage due to the aforementioned pressing force.

In addition, according to the above-mentioned embodiment, the cam inclined surface 20a of the pen holder 20 is an inclined surface with a straight cross section, and as another example of the cam inclined surface, it can be an inclined surface with a convex curved section (see FIG. 11 (a )), An inclined surface having a concave curved surface (see FIG. 11 (b)), and an intermittent inclined surface (see FIG. 11 (c)).

Next, a modification of a characteristic portion in the writing instrument of the present invention will be described. In addition, the modification shown below is a modification of the writing instrument 1 described above, so this modification will be mainly explained in detail. The parts that are substantially the same as the writing instrument 1 are added. The same symbols as those of the writing implement 1 are omitted and detailed explanations are omitted.

In the writing instrument 2 shown in Figs. 12 (a) and (b), a cam inclined surface 11a 'is provided at the front opening of the shaft cylinder 10'. The cam inclined surface 11a 'constitutes a movement direction conversion mechanism which slides the pen holder 20' forward by a force applied in a direction outside the shaft diameter of the pen holder 20 '.

The shaft cylinder 10 'is formed of a single or a plurality of cylinders similarly to the above-mentioned shaft cylinder 10, and an opening portion whose diameter is reduced at the front end side has a ring-shaped cam inclined surface 11a' which is enlarged in diameter toward the front.

The pen holder 20 'engages forward and backward through the cam inclined surface 11a' to the front opening portion of the shaft cylinder 10 ', and is biased toward the rear of the shaft cylinder by the pen clip biasing member 13 in the shaft cylinder 10'. The pen holder urging member 13 can move in the radial direction of the shaft tube while being advanced.

That is, the pen holder 20 ′ is configured with respect to the pen holder 20 by replacing the cam inclined surface 20 a with the cam inclined surface 11 a ′ of the front opening of the shaft cylinder 10 ′, and an annular protrusion is provided on the outer peripheral surface of the pen holder 20 ′. 20a '. The annular protrusion 20a 'is arranged to be in sliding contact with the cam inclined surface 11a'.

According to the writing instrument 2 shown in Figs. 12 (a) and (b), the reaction force (pen pressure) in the cross direction is applied from the writing surface P to the front from the pen holder 20 'in substantially the same manner as the writing instrument 1 described above. When the reaction force of the protruding writing lead 30 is larger than the normal pen pressure range, the pen holder 20 'receives the reaction force, so that the ring-shaped protrusion 20a' of the pen holder 20 'is on the front side of the shaft cylinder 10' The cam inclined surface 11 a ′ of the opening portion slides and advances while moving in a direction outside the diameter of the shaft cylinder.

Thereby, according to the writing instrument 2, the lead core 31 protruding from the pen holder 20 'can also be covered and protected by the pen holder 20' advancing.

In addition, the core powder discharge groove 32e2 on the outer periphery of the slide drum 32e discharges the core powder caused by the advancement and retreat of the chuck 32b and the slide drum 32e in the axial direction, and can reduce the malfunction caused by the fixation of the core powder.

In addition, when the pen holder 20 'is retracted, the spring receiving portion 21 that is retracted integrally with the pen holder 20' abuts against the buffer member 33, and the buffer member 33 elastically contracts. Therefore, it is possible to reduce the operation sound caused by the retracting of the clip 20 'and the spring receiving portion 21.

In addition, according to the above-mentioned embodiment, when the pen holder 20 (or 20 ') is tilted while moving forward while moving in the outer diameter direction of the shaft cylinder, on its rear end side, the core reservoir 32a is brought into contact with the shaft cylinder 10 by As another example, as shown in FIG. 9, the core reservoir 32 a may be swingably connected to the connecting member 32 m. In this another example, for example, one of the rear end side of the connecting member 32m and the front end side of the core reservoir 32a may be provided with a recessed portion and a projected portion which are fitted in the radial direction of the shaft cylinder with a clearance.

In addition, according to the above-mentioned embodiment, the writing core 30 is used as a writing core for a mechanical pencil (sometimes referred to as a replacement core for a mechanical pencil). As another example, the writing core 30 may be used as a writing core for a ballpoint pen (for a ballpoint pen). (Replacement core) and the writing core of a signature pen, the writing core of a marker pen, and the writing core of a correction pen.

For example, when a writing core for a ballpoint pen having a needle-shaped (in other words, a long cylindrical shape) ballpoint pen tip is used as the writing core 30 described above, the needle-shaped portion of the ballpoint pen tip is inserted into the pen holder 20, The front end portion of the pen holder 20 (or 20 ') may be protruded forward, and the writing core for the ballpoint pen may be tilted in the same manner as the writing core 30 in the shaft cylinder 10.

In addition, when the writing core 30 is a writing core other than a writing core for a mechanical pencil, the tip of the writing core can be made to protrude from the tip of the pen holder 20 (or 20 ') so as to be inaccessible, and There are two aspects of a state in which the front end portion of the writing core enters and exits from the front end of the pen holder 20 (or 20 ').

Furthermore, according to the above-mentioned embodiment, only in the front-end-side opening portion of the barrel and the pen holder One side is provided with a cam inclined surface. As another example, it may be provided on both sides so that the pen holder advances by sliding contact between the cam inclined surfaces.

In addition, according to the above embodiment, the cam inclined surface is provided on the outer peripheral surface of the pen holder 20 and the front opening portion of the barrel 10. As another example, as shown in FIG. 13, the cam inclined surface may be provided on the pen holder 20 ” The appearance of the rear part.

The writing instrument 3 shown in FIG. 13 is provided with a ring-shaped recessed portion fitted into the leading end edge of the barrel 10 "at the rear end side of the pen holder 20", and the surface on the outer diameter side in the recessed portion is oriented. A cam inclined surface 23 "with a reduced diameter at the front. A tubular protective tube 22" is fixed to the tip side of the pen holder 20 "so as to cover the lead 31.

According to the writing instrument 3, if a force in a cross direction is applied to the pen holder 20 "via the lead core 31 at the front end of the writing core 30 as in the above embodiment, the cam inclined surface 23" slides on the front edge of the shaft cylinder 10 ", and the pen The clip 20 "and the protective tube 22" are advanced (refer to the double-dot chain line in Fig. 13). That is, the cam inclined surface 23 "acts as a force applied to the pen holder by a force outside the shaft diameter of the cam inclined surface 23". 20 "forward movement direction switching mechanism comes into play.

Thereby, the front end side of the lead core 31 can be covered and protected by the forward protection tube 22 ".

In addition, by using the mechanism substantially the same as that of the writing instruments 1 and 2, the core powder can be discharged in the axial direction through the core powder discharge groove 32e2, thereby reducing the malfunction caused by the fixing of the core powder, and by using the buffer 33. The operation sound when the pen holder 20 "and the spring receiving portion 21 are retracted is reduced.

Further, according to the above-mentioned embodiment, the advancement and retreat member 40 is interposed between the writing core support portion 32g20 of the writing core 30 and the writing core urging member 50. However, as in the writing instrument 4 shown in FIG. 14, the advancement and retreat member may be omitted. 40.

The writing instrument 4 shown in FIG. 14 is obtained by omitting the advancing and retreating member 40 from the writing instrument 1 described above, and The writing core urging member 50 is replaced with a writing core urging member 50 '.

The writing core urging member 50 'is a compression coil spring whose diameter gradually decreases toward the front. In a state where the rear end is received by the front end of the rear shaft cylinder 12, the front end is directly abutted against the writing core support portion 32g20 to directly The writing core 30 is forced forward.

With this, according to the writing implement 4 shown in FIG. 14, when an excessive pressing force directed toward the rear is applied to the lead core 31, the writing core 30 is made to withdraw against the force of the writing core urging member 50 ′, so that it can be prevented. The lead 31 is broken.

In addition, according to the mechanism substantially the same as that of the writing instruments 1 and 2, the core powder can be discharged in the axial direction by the core powder discharge groove 32e2, thereby reducing the malfunction caused by the fixing of the core powder, and can be reduced by the buffer 33. The operation sound when the small pen holder 20 and the spring receiving portion 21 move backward.

In addition, the movement direction conversion mechanism (for example, the cam inclined surface 20a, etc.) may be configured to advance the pen holder with respect to the mandrel and the writing core by a force applied in a direction outside the diameter of the pen barrel, for example, as The form shown in FIG. 15 may have a structure other than the above.

The writing instrument 5 shown in FIG. 15 is a person who replaces the pen holder 20 with the pen holder 60 for the writing instrument 1 described above.

The pen holder 60 is a generally tapered cylindrical member that is inserted forward and backward through the front opening portion 11 a of the shaft cylinder 10 and protrudes forward from the front end of the shaft cylinder 10. The writing core 30 is inserted through the writing core 30 in a contact manner.的 铅 芯 31。 The lead 31. The rear end side of the pen holder 60 is connected to the spring receiving portion 21. Therefore, the pen holder 60 is urged backward by the pen holder urging member 13.

The pen holder 60 includes a flexure piece portion 61 that can be flexed in the direction of the diameter of the shaft cylinder at a portion that is in sliding contact with the front opening portion 11 a of the shaft cylinder 10.

As shown in FIG. 16, a plurality of flexures are provided at the rear end portion of the pen holder 60 at intervals in the circumferential direction. 曲 片 部 61。 The curved piece portion 61. To explain in detail, a plurality of cutouts are formed in the rear end portion of the pen holder 60 in the circumferential direction at intervals, thereby forming a flexure piece portion 61 between adjacent cutouts. A space is provided on the inner peripheral surface side of each of the flexure piece portions 61 so that each of the flexure piece portions 61 can be flexed in the direction of the shaft cylinder diameter.

The flexure pieces 61 may be formed by double-molding a soft synthetic resin material (for example, an elastic material resin) on the rear end side of the pen holder 60 including a hard synthetic resin, for example.

According to this, according to the writing instrument 5 shown in FIG. 15, if a force in a cross direction is applied to the pen holder 60 through the lead 31 at the front end of the writing core 30, the bending piece portion 61 at the rear end side of the pen holder 60 is bent, A cam inclined surface 61 a is formed on an outer peripheral surface of the flexure piece portion 61 (refer to a two-dot chain line in FIG. 15).

Therefore, similarly to the above-mentioned embodiment, the pen holder 60 slides the cam inclined surface 61 a toward the front opening portion 11 a of the shaft cylinder 10 to advance against the urging force of the pen holder urging member 13. This advancement is rapidly performed by the elastic restoring force acting on the flexure piece portion 61.

Thereby, the front end side of the lead core 31 can be covered and protected by the forward pen clip 60.

In addition, according to the above-mentioned embodiment, as a particularly preferable aspect, a plurality of core powder discharge grooves 32e2 on the outer periphery of the plurality of (six according to the example of the figure) 32e2 are provided. As another example, the core powder discharge grooves may also be provided. 32e2 is set to a single number or a number other than the example shown in the figure.

In addition, according to the above-mentioned embodiment, a core powder discharge groove 32e2 is provided in the rear side of the slide cylinder 32e and the sliding contact surface of the holding cylinder 32g as a particularly effective way to discharge lead powder. As another example, A groove may be provided on the front side of the slide cylinder 32e (more specifically, the portion closer to the front side than the enlarged diameter portion 32e1 in FIG. 3) and continuous with the core powder discharge groove 32e2.

And, according to the above embodiment, for the pen holder 20, 20 ', or 20 " The mechanical pencil is provided with a slide cylinder 32e and a core powder discharge groove 32e2. As another example, a mechanical pencil of a type that does not have the aforementioned pen holder (for example, the inventions described in Japanese Patent Publications 2010-201813 and 2010-094954) In the replacement core for a mechanical pencil of a multifunctional writing instrument (for example, the invention described in Japanese Patent Laid-Open No. 2008-126596), the slide cylinder 32e is provided between the core interrupter and the chuck.

In addition, for example, in the invention described in Japanese Utility Model Publication No. Sho 63-180283, the buffer member 33 in the above embodiment may be provided between the center shaft (2) and the pressing portion (3a). In addition, in other writing instruments (including ballpoint pens, signature pens, etc.) in which the clip covering the writing core moves forward and backward with respect to the shaft, the buffer member 33 can be provided to be contracted by being retracted by the aforementioned clip.

In addition, according to the above-mentioned embodiment, the buffer receiving member 33 receives the spring receiving portion 21 integrated with the pen holder 20. As another example, the spring receiving portion 21 may be configured as an integral member. The buffer member 33 receives the integrated member; and the spring receiving portion 21 is omitted from the above configuration, and a protrusion for receiving the pen clip urging member 13 is formed on the outer periphery of the rear end side of the pen holder 20, and the buffer member 33 Accept the form and the like of the clip 20 directly.

Further, according to the writing instrument 5 shown in FIG. 15, the rear end portion of the pen holder 60 is formed of a soft synthetic resin material. As another example, the entire pen holder 60 is formed of a flexible synthetic resin material, and The end portion functions as the above-mentioned flexure piece portion 61.

In addition, according to the writing instrument 5 shown in FIG. 15, a plurality of flexure pieces 61 are provided on the rear end side of the pen holder 60. As another example, a soft synthetic resin material may be formed on the rear end side of the pen holder 60. A continuous tubular flexure piece.

Claims (13)

A writing instrument includes: a shaft cylinder; a pen holder inserted through a front opening portion of the shaft cylinder and protruding forward from the front end of the shaft cylinder; a writing core in contact with the inner peripheral surface of the pen holder and inserted through The pen holder is supported on a shaft cylinder so as to protrude forward from the front end of the pen holder, and is characterized in that a movement direction conversion mechanism is provided between the shaft cylinder and the pen holder, and the movement direction conversion mechanism is applied to The force in the outer diameter direction of the barrel of the pen holder advances the pen holder relative to the barrel and the writing core; the movement direction conversion mechanism is provided with a cam inclined surface on at least one of the barrel and the pen holder and makes the aforementioned The pen holder is engaged with the shaft cylinder through the cam inclined surface so as to advance and retreat. The cam inclined surface is inclined so that the force applied to the outer direction of the shaft cylinder diameter of the pen holder and the other side slide against the other to make the aforementioned The pen holder advances. For example, the writing instrument of the scope of patent application, wherein the cam inclined surface is provided on at least one of an outer peripheral surface of the pen holder and a front opening of the shaft cylinder so as to be enlarged in diameter toward the front, and is opposite to the one opposite to the aforementioned one. The other side slides to advance the clip. For example, the writing instrument of the scope of patent application, wherein the pen holder is set forward and backward between the advance position with respect to the barrel and the writing core and the initial position before the advance, and is formed as follows: In the initial position, it is fitted to the front opening of the shaft cylinder so as not to be able to move in the radial direction of the shaft cylinder, and in the forward position, it is fitted to the front opening portion in a state with a margin of movement in the radial direction of the shaft cylinder. For example, the writing instrument in the scope of patent application, wherein The pen clip urging means is provided with the pen clip urging means. For example, the writing instrument according to the scope of patent application, wherein the writing core is supported so as to be slightly movable in the radial direction of the shaft cylinder with respect to the shaft cylinder on the rear side than the pen holder. For example, the writing instrument in the scope of patent application No. 1 includes a section in the shaft cylinder to reduce the diameter of the front side; and a writing core supporting inclined surface that expands toward the front on the rear side than the section. The outer periphery of the writing core includes a writing core supporting portion that protrudes outward. The writing core supporting portion is provided between the segment portion and the writing core supporting inclined surface in a shaft cylinder, and the writing core supporting portion can be moved along the rear and the shaft. The barrel moves slightly radially. For example, the writing instrument of the scope of application for a patent, wherein the aforementioned writing core is a writing core for a mechanical pencil having a lead core and a lead core unscrew mechanism for rotatably holding the lead core. It is supported in the shaft cylinder by being inserted into the pen holder. For example, the writing instrument of the seventh scope of the patent application, wherein the lead core unwinding mechanism is provided with: a core storage, which has a lead core built in, and keeps it in and out of the shaft cylinder; a chuck, and the core storage The front end is connected and clamped the lead core; the clutch ring is fitted to the chuck so as to be disengaged to the rear side; the core interrupter elastically holds the lead core on the front side than the aforementioned clutch ring; the holding cylinder can advance and retreat The chuck and the clutch ring are built in, and the core interrupter is built in so as not to be able to advance and retreat; and a core reservoir urging member is configured to apply a force to the core reservoir to the rear with respect to the holding cylinder in the holding cylinder. It is provided with a rear contact portion that receives the aforementioned clutch ring from the rear side, and a front contact portion that receives the clutch ring when it is moved forward from the front side. For example, the writing instrument of the eighth aspect of the invention, wherein the pen holder is fitted forward and backward on the front end side of the holding cylinder. For example, the writing instrument with the scope of patent application No. 8 includes: The chuck can advance and retreat in a state where a lead core is inserted through the chuck; and a slider biasing member biases the slider backward with respect to the holding cylinder. For example, the writing instrument of the first patent application scope, wherein a writing core urging member for urging the writing core forward with respect to the shaft is provided in the shaft cylinder, and the writing core is oriented in a direction higher than a predetermined pen pressure. The rear force resists the application force of the writing core urging member and retracts. For example, a writing instrument with a scope of application for patent No. 10, wherein a core powder discharge groove penetrating in the axial direction is provided on an outer peripheral surface of the slide cylinder. For example, a writing instrument according to any one of claims 1 to 12, wherein a buffer member is provided, and the buffer member is elastically deformed by receiving the pen holder when retracted.