JP2001039087A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable smooth writing to be performed in such a state that the tip angle of a lead is blunted even when the writing is initiated with a new lead or a lead whose tip is broken by arranging a lead sharpening member for tapering the tip of the lead fed out of a pen point part, on the pen point part of a pencil body. SOLUTION: A lead sharpening member 16 for tapering the tip of a lead 14 which is fed out of a pen point part mounted on the pen point part 12 of a pencil body 11. The lead sharpening member 16 has a rotatable part 17 which is fitted, in a freely rotating manner, to the tip pipe part 12c of the pen point part 12 and rotatable around the axis of the lead 14 and the rotatable part 17 has a tapered outer peripheral face 17a connected to the outer peripheral face of a base part 12b of the pen point part 12. Further, the rotatable part 17 is made up of an elastic plastic and has an annular groove 17c, fitted to an annular rib 12d at the tip pipe part 12c, which is formed in the inner face of a center hole 17b fitted to the tip pipe part 12c of the pen point part 12. The rotatable part 17 is fitted way over the tip pipe part 12c upto a position where the annular rib 12d is engaged with the annular groove 17c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil, and more particularly, to a mechanical pencil capable of sharpening the tip of a lead.

[0002]

2. Description of the Related Art In general, a mechanical pencil is provided with a lead-out mechanism in a pencil body, so that the lead can be fed out by a required amount from a pen tip of the pencil body at the time of writing.

[0003]

When a new lead is fed out or when the tip of the lead is broken, the tip of the lead becomes square, making it difficult to write lines or characters. . For this reason, only for the purpose of dropping the corner of the tip of the core,
Many lines are often drawn in the margins on the paper surface, etc., but this causes useless soiling of the paper surface.

Accordingly, an object of the present invention is to provide a mechanical pencil capable of easily cutting the tip of a lead when necessary.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pencil body having a pen tip portion, provided on the pen tip portion of the pencil body, and fed out from the pen tip portion. A sharpening member for sharpening the tip of a bent core.

According to the above construction, the pen tip of the pencil body is provided with a core cutting member for tapering the tip of the core fed out of the pen tip, so that the tip of the core can be used when necessary. Can be sharpened by the core shaving member. Therefore, even when writing is started with a new core or when writing is started with a broken core, lines and characters can be drawn smoothly with the corner of the tip of the core dropped. In addition, since this centering member is provided on the tip of the mechanical pencil, there is no need to carry it separately,
There is no worry about loss.

In the above structure, preferably, the core shaping member has a tapered outer periphery rotatably mounted on the pen tip portion around the axis of the core, and a core extending along the outer periphery of the rotary portion. A centering slider movably provided between a position in contact with the leading end of the lead and a position separated from the leading end of the lead, and spring means for applying a force to move the lead cutting slider in a direction away from the leading end of the lead. And

According to the above construction, the corner of the leading end of the lead can be scraped off by moving the lead removing slider to a position where the lead removing slider rubs against the leading end of the lead when necessary against the spring force of the spring means. In addition, since the rotating portion can be rotated while the centering slider is in contact with the leading end of the lead, the leading end of the lead drawn out from the pen tip can be cut on the taper over the entire circumference. Therefore, the shape and thickness of the tip of the core can be changed arbitrarily, so that a variety of writing can be performed.

[0009] Preferably, the centering slider comprises:
It has fine irregularities on the surface that contacts the tip of the core.

According to the above construction, the leading end of the lead can be efficiently and quickly cut by the lead cutting slider.

Preferably, the pencil main body includes the pen tip portion and a main body shaft, and the pen tip portion is detachably screwed and connected to a tip of the main body shaft.

According to the above construction, since the centering member can be separated from the main body shaft together with the pen tip portion, the centering member can be replaced when it is damaged, or a pen having a different type of centering member can be provided. Exchange to the tip becomes easy.

[0013]

Embodiments of the present invention will be described below with reference to the drawings showing preferred embodiments of the present invention.

[0014]

1 to 5 show an embodiment of the present invention. FIG. 1 is a sectional view of a main part of a mechanical pencil, and FIGS. 2 (a), 2 (b), 2 (c), and 2 (d) are perspective views, side views, and left ends of the mechanical pencil shown in FIG. It is a front view and a right end view. FIG.
(A), (b), (c) and (d) are a perspective view, a side view, a left end view, and a right end, respectively, showing a rotating part of a centering member provided at a pen tip of the mechanical pencil shown in FIG. 4 (a), (b), (c), and (d) are perspective views and side views, respectively, showing a centering slider of a centering member provided at a pen tip of the mechanical pencil shown in FIG. It is a figure, a left end view, and a principal part perspective view. FIG. 5 is a perspective view showing how to use the mechanical pencil shown in FIG.

Referring first to FIG. 1, a mechanical pencil includes a pencil body 11 having a pen tip portion 12 and a pipe-shaped main body shaft 13. The pen tip portion 12 is formed separately from the main body shaft 13. The main body shaft 13 is detachably screwed and connected to a screw shaft portion 13a formed at the tip of the main body shaft 13.

Although not shown in detail, a core accommodating tube for accommodating a plurality of cores 14 inside the main body shaft 13 and the cores 14 in the core accommodating tube are fed out one by one from the pen point portion 12 to the outside. 1 is provided, and reference numeral 15 in FIG. 1 denotes a tip chuck of the centering mechanism. In the present invention, since the centering mechanism is not an essential part, existing various forms of centering mechanism can be applied.

As shown in FIGS. 1 and 2, the pen tip 12 of the pencil body 11 has a center through hole 12a through which a lead 14 fed by a lead feeding mechanism is passed.
have. Here, the pen tip portion 12 includes a base portion 12b and a tip end pipe portion 12c, and the penetrating hole 12a
Extends through the central portion of the base portion 12b and the distal end pipe portion 12c. The base portion 12b of the pen tip portion 12 has an outer shape whose rear end substantially matches the outer shape of the main body shaft 13, and is gradually tapered from the rear end to the front end. Also,
The tip end pipe portion 12c of the pen tip portion 12 has a cylindrical shape, and an annular rib 12d is formed on the outer periphery of a substantially central portion thereof.

Referring to FIG. 1, FIG. 3 and FIG. 4, the pen tip 12 of the pencil body 11 has a core cutting member 16 for tapering the tip of the core 14 drawn out from the pen tip 12. Is provided. Centering member 16 of this embodiment
Has a rotating portion 17 rotatably fitted to the tip pipe portion 12c of the pen tip portion 12 and rotatable around the axis of the lead 14, and the rotating portion 17 is in contact with the outer peripheral surface of the base portion 12b of the pen tip portion 12. It has a continuous tapered outer surface 17a. In addition, the rotating portion 17 of this embodiment is made of elastic plastic, and has an inner surface of a central hole 17b that fits with the tip pipe portion 12c of the pen tip portion 12, and is engaged with an annular rib 12d of the tip pipe portion 12c. Annular groove 17c
Are formed. Therefore, the rotating portion 17 uses the elastic deformation to rotate the annular rib 12 from the front of the pen tip portion 12.
It can be fitted on the distal end pipe portion 12c to a position where d engages with the annular groove 17d.

The rotating part 17 of the core shaping member 17 is provided with two core shaving sliders 18 which can move between a position in contact with the tip of the core 14 and a position separated from the tip of the core 14 along the outer periphery thereof. (Only one is shown in detail in FIG. 1). In this embodiment, two mounting grooves 17d extending from the rear end to the front end of the rotating portion 17 are formed on the outer peripheral surface of the rotating portion 17, and the two centering sliders 18 are respectively fitted to the two mounting grooves 17d. While being held, it is guided by the mounting groove 17d and is movable in its length direction.

Further, a leaf spring 19 is attached to the centering slider 18 as a spring means for applying a force so as to move the centering slider 18 away from the tip of the core 14.

More specifically, an annular recess 17g is formed at the rear portion of the rotating portion 17 so as to form a central cylindrical portion 17e and an outer peripheral wall portion 17f. Two mounting grooves 17d are formed. On the other hand, the centering slider 18 has a main body 18a curved so as to conform to the tapered shape of the outer peripheral surface of the rotating portion 17, and
The main body 1 through the engagement neck 18b engaging with the mounting groove 17d.
8a has an engaging head 18c provided integrally with the main body 18a.
The outer peripheral wall portion 17f can be sandwiched between the peripheral edges of 7d.
Therefore, after inserting the neck portion 18b of the centering slider 18 into the mounting groove 17d from behind the rotating portion 17, the rotating portion 1
7 is fitted and attached to the pen tip portion 12, the centering slider 18 is held so as to be movable in the length direction of the mounting groove 17d, and is prevented from coming off by the engaging head 17f.

Further, one end of the leaf spring 19 is fixedly attached to the engaging head 18c of the centering slider 18, and the centering slider 18 is attached to the mounting groove 17d of the rotating portion 17.
When the plate spring 19 is held in this state, the other end of the leaf spring 19 is formed in a curved state so as to abut the inner bottom of the recess 17 g of the rotating portion 17. Therefore, when the centering slider 18 attached to the rotating portion 17 is moved forward to a position where the tip of the main body 18a contacts the tip of the core 14, as shown by a two-dot chain line in FIG. Thus, the force for returning the centering slider 18 to the rear is stored.

Further, as shown in FIG. 4 (d), in this embodiment, a large number of fine irregularities 18d are formed on the inner surface of the leading end of the body 18a of the centering slider 18, that is, the surface that comes into contact with the leading end of the lead 14. The tip of the core 14 can be efficiently cut by the file effect of the unevenness 18d. The shape of the protrusion in the unevenness 18a can be, for example, a substantially triangular pyramid, a quadrangular pyramid, a cone, or the like.

In the mechanical pencil having the above configuration,
The pen tip 12 of the pencil body 11 is provided with a core cutting member 16 for tapering the tip of the core 14 fed out of the pen tip 12, so that the tip of the core 14 is sharpened when necessary. The member 16 can be tapered. Therefore, even when writing is started with a new core or when writing is started with a broken tip, it is possible to smoothly draw a line or a character with the corner of the tip of the core 14 dropped.
In addition, since the centering member 16 is provided on the pen tip portion 12 of the mechanical pencil, there is no need to separately carry the centering member 16 or to lose it.

In particular, in the above embodiment, the centering member 16 has a tapered outer periphery that is rotatably mounted on the pen tip portion 12 about the axis of the core 14, and a peripheral portion of the rotary portion 17. And a centering slider 18 movably provided between a position in contact with the tip of the core 14 and a position away from the tip of the core 14 along a direction in which the centering slider 18 is separated from the tip of the core 14. Since it has a leaf spring (spring means) 19 for applying a force to move it, as shown in FIG. 18 to core 14
By moving in the direction of arrow A in FIG. 5 to a position where the tip of the lead 14 is rubbed, the corner of the tip of the lead 14 can be cut off. Further, with the two centering sliders 18 in contact with the tip of the core 14, the rotating part 17 is moved relative to the pen tip 12 as shown in FIG.
Since the core 14 can be rotated in the direction of the middle arrow B, the tip of the core 14 drawn out from the pen tip portion 12 can be cut into a taper over the entire circumference. Therefore, the core 14
The shape and thickness of the tip can be arbitrarily changed, so that a variety of writing can be performed.

Further, the main body 18a of the centering slider 18
Since a large number of fine irregularities 18d are provided on the inner surface of the tip portion of the
Can be efficiently and quickly cut by the centering slider 18.

Further, in the above embodiment, the pencil main body 11 is composed of the pen tip portion 12 and the main body shaft 13, and the pen tip portion 12 is detachably screwed and connected to the tip of the main body shaft 13, so that the centering member is formed. 16 can be separated from the main body shaft 13 together with the pen tip portion 12. Therefore, it is possible to easily replace the pen nib member 16 when the pen nib member 16 is damaged, or to replace the pen nib portion 12 with a different kind of core cutting member 16.

Although the illustrated embodiment has been described above, the present invention is not limited to only the above embodiment.
For example, the pen body 12 is formed by integrally forming the pen tip portion 12 and the body shaft 13, or only one or three or more centering sliders 18 in the centering member 16 are provided on the rotating portion 17. Can be changed. The spring means for applying a spring force to the centering slider 18 is not limited to a leaf spring, but may be a coil spring, elastic rubber, resin, or the like.

[0029]

As is apparent from the above description, the mechanical pencil according to the present invention has a pen tip on the pen body of the pencil body for sharpening the tip of the lead fed out from the pen tip. Since the shaving member is provided, the leading end of the core can be tapered by the core shaving member when necessary. Therefore, even when writing is started with a new core or when writing is started with a broken core, lines and characters can be drawn smoothly with the corner of the tip of the core dropped. Moreover, since the centering member is provided at the pen tip of the mechanical pencil, there is no need to separately carry the centering member, and there is no risk of loss.

Therefore, according to the present invention, it is possible to provide a mechanical pencil that can easily sharpen the tip of the core when necessary and is highly portable.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a mechanical pencil showing an embodiment of the present invention.

2 (a), (b), (c), and (d) are a perspective view, a side view, a left end view, and a right end view of the tip of the mechanical pencil shown in FIG. 1, respectively.

FIGS. 3 (a), (b), (c), and (d) are perspective views, side views, and left end views, respectively, showing a rotating portion of a centering member provided at a pen tip of the mechanical pencil shown in FIG. It is a figure and a right end view.

4 (a), (b), (c), and (d) are perspective views, side views, and left ends of a centering slider of a centering member provided at a pen tip of the mechanical pencil shown in FIG. 1, respectively. It is the front view and the principal part perspective view.

FIG. 5 is a perspective view showing how to use the mechanical pencil shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pencil main body 12 Pen tip part 13 Main body shaft 14 14 15 Tip chuck of core feeding mechanism 16 Core cutting member 17 Rotating part 18 Core cutting slider 18d Unevenness 19 Leaf spring (spring means)

Claims (4)

[Claims] 1. A pencil body having a pen tip portion, and a core shaving member provided at the pen tip portion of the pencil body, for sharpening a tip of a core fed out from the pen tip portion. A mechanical pencil characterized by having. 2. A rotating part having a tapered outer periphery rotatably attached to the pen tip portion around an axis of a core, and the core cutting member contacts a tip of the core along the outer periphery of the rotating portion. A centering slider movably provided between a position and a position separated from the leading end of the lead; and a spring means for applying a force to move the leading grinding slider in a direction away from the leading end of the lead. The mechanical pencil according to claim 1, wherein: 3. The centering slider has fine irregularities on a surface in contact with the tip of the core.
The described mechanical pencil. 4. The mechanical pencil according to claim 1, wherein the pencil main body comprises the pen tip portion and a main body shaft, and the pen tip portion is detachably screwed and connected to a tip of the main body shaft.