JPH1178355A - Propelling pencil and refill lead cartridge therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply the refill lead in a refill lead cartridge into a lead housing part through a lead supplying hole by a method wherein the refill lead cartridge is installed in a pencil main body. SOLUTION: In a pencil main body 20, a lead housing part 22 is arranged concentric to the pencil main body. In addition, at the upper part of the lead housing part 22, a cartridge housing part 23 is provided. On the other hand, a refill lead cartridge consists of a refill lead housing part 31, in which a lead supplying hole 33 is formed, and an installing part 32, in which an installing hole 35 for installing the lead housing part 22 therein is formed and, at the same time, a pair of collect pieces 36 are provided so as to close up the lead supplying hole 33. By housing the refill lead cartridge 30 is housed in a cartridge housing chamber 23, the lead housing part 22 is inserted in the installing hole 35 and, as a result, the collet pieces 36 are widened so as to open the lead supplying hole 33. Thus, refill lead B in the refill lead housing part 31 is supplied through the opened lead supplying hole 33 in the lead housing part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil which is used by drawing out a pencil lead.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a general mechanical pencil. In the figure, reference numeral 1 denotes a pencil main body, which is constituted by disposing a lead accommodating portion 4 for accommodating a pencil lead 3 coaxially with the cylindrical case 2 in the elongated cylindrical case 2. The lower end (the lower left end in FIG. 5) of the pencil main body 1 is formed to be tapered, and a feeding mechanism (not shown) is provided therein. When the lead accommodating portion 4 is displaced downward along the cylindrical case 2 (obliquely downward in FIG. 5), the pencil lead 3 in the lead accommodating portion 4 is gradually fed out from the lower end of the pencil body 1. Has become. Further, the upper end of the core receiving portion 4 extends to the upper edge position of the cylindrical case 2, and the core receiving port 4 </ b> A
Is formed. The cap 5 is provided detachably there.

[0003] By the way, usually, a refill lead (pencil lead) is prepared in a state where a plurality of refill leads are housed in a small case separate from a mechanical pencil. Then, in order to supply the extra lead into the core receiving portion 4, the lid of the small case is opened and one extra lead is taken out. Thereafter, the cap 5 of the mechanical pencil is removed, and the lead receiving portion 4A is removed from the lead receiving opening 4A. This is done by inserting it inside.

[0004]

However, it is troublesome to manually take out the extra lead from the small case and supply it into the lead accommodating portion each time. In particular, since the refill is thin and easily broken, the work must be performed carefully, and it is very troublesome for an unfamiliar one to perform. The present invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mechanical pencil and a refill cartridge which can facilitate the supply operation of the refill.

[0005]

According to another aspect of the present invention, there is provided a mechanical pencil having a lead accommodating portion for accommodating a pencil lead in a pencil body, and the lead accommodating portion is provided along the pencil body. A mechanical pencil that dispenses the pencil lead in the lead holder from the lower end of the pencil body.The pencil body is detachably provided with a lead cartridge containing a plurality of pencil leads. In addition, the refill cartridge is characterized in that a refill cartridge is provided with a refill supply hole for supplying the refill into the lead accommodating portion while being mounted on the pencil body.

According to a second aspect of the present invention, a refill cartridge for a mechanical pencil has a lead accommodating portion for accommodating a pencil lead in a pencil body, and the lead accommodating portion is displaced along the pencil body to thereby provide a pencil lead in the lead accommodating portion. Is a refill cartridge used in a mechanical pencil having a configuration in which the refill is drawn out from the lower end of the pencil main body. The refill cartridge is capable of accommodating a plurality of refills, which is a pencil lead, and is detachably provided on the pencil main body. A core supply hole for supplying a refill core into the core accommodating portion in a state where the core is mounted is formed.

According to a third aspect of the present invention, there is provided a refillable cartridge for a mechanical pencil, wherein the refilling hole is provided with a door for opening and closing the refilling hole. In the detached state, the lead supply hole is located at a position to close the lead supply hole, and is displaced to a position at which the lead supply hole is opened as the replacement lead cartridge is mounted on the pencil body.

[0008]

According to the first and second aspects of the present invention, in order to supply a refill lead into the lead accommodating portion of the pencil body, the refill cartridge may be mounted on the pencil body. Then, the extra lead in the extra lead cartridge is supplied into the lead accommodating portion through the lead supply hole. Therefore, as before,
Since it is not necessary to manually take out the refills one by one from the small case, the refills do not break, and the refill supply operation can be easily performed.

According to the third aspect of the present invention, when the refill cartridge is detached from the pencil main body, the lead supply hole is closed. When the refill cartridge is mounted on the pencil main body, the refill supply hole is opened with the mounting, and the refill in the refill cartridge is supplied into the lead accommodating portion via the refill supply hole. Therefore, before the refill cartridge is mounted on the pencil main body, the refill can be prevented from falling out of the lead supply hole.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a mechanical pencil according to an embodiment of the present invention; FIG. As shown in FIGS. 1 and 2, the mechanical pencil according to the present embodiment includes a pencil body 20 and a refill cartridge 30.

The pencil body 20 is made of an elongated cylindrical case 2.
1, a core receiving portion 2 having a diameter smaller than that of the cylindrical case 21.
2 are arranged coaxially. The lower end (the lower left end in FIG. 1) of the cylindrical case 21 is tapered. A feeding mechanism (not shown) is provided in the lower end portion of the cylindrical case 21, and each time the lead accommodating portion 22 is displaced downward along the cylindrical case 21 (obliquely downward left in FIG. 1). The pencil lead in the storage section 22 is extended from the lower end of the pencil body 20. This feeding mechanism has the same configuration as that of the conventional one, and is briefly described. At the lower end of the lead housing part 22, three holding pieces are disposed around the axis. When it is displaced downward along, each holding piece is displaced downward while holding the pencil lead. That is, the tip of the pencil lead is fed out from the lower end of the pencil body 20. Then, when the lead accommodating portion 22 is displaced downward to some extent, each holding piece is opened and separated from the pencil lead, and is returned to the original state together with the lead accommodating portion 22 by a spring.

The length of the core accommodating portion 22 is set at the upper end thereof (FIG. 1).
The middle, upper right end) is formed to have a length such that it is located substantially at the center of the cylindrical case 21, and the upper end is opened to serve as a core accommodating opening 22A. The upper part of the core accommodating portion 22 is a cartridge accommodating chamber 23, and a refill cartridge 30 to be described later is removably accommodated through an insertion port 23A formed in the upper edge portion. . As shown in FIG. 2, the upper edge portion of the core accommodating portion 22 is cut out in a tapered shape, and a mounting hole 35 described later is formed.
To make it easier to insert.

The refill cartridge 30 has an elongated cylindrical shape, and is provided with a refill storage section 31 and a mounting section 32 capable of storing a plurality of refill cores B. As shown in FIG. 2, the outer diameter of the refill cartridge 30 is
3 is slightly smaller than the inner diameter of the cartridge housing chamber 2.
3 and can be displaced up and down along the cartridge accommodating chamber 23.

A bottom portion (left portion in FIG. 2) in the refill storage portion 31 is formed in a mortar shape, and a center supply hole 33 is formed at the center thereof.
Is formed, and the extra lead B in the extra lead storage portion 31 is supplied through the lead supply hole 33. The lower end edge (the left end edge in FIG. 2) of the core supply hole 33 protrudes slightly downward (the left end in FIG. 2) to form a protruding portion 34, and further, the tip portion of the protruding portion 34 (FIG. 2). As shown in FIG. 4, the left and right sides (the upper and lower sides in FIG. 4) of the middle and left ends are cut out in a tapered shape, and a lid portion 36 </ b> A described later comes into close contact therewith.

A mounting portion 3 is provided below the refill lead storage portion 31.
2 are integrally formed. At the center of the mounting portion 32, a mounting hole 35 having the same diameter as the outer diameter of the core housing portion 22 is formed, and the upper end of the core housing portion 22 can be press-fitted therein. Also, inside the mounting hole 35, both left and right side walls (FIG. 2)
A pair of door pieces 36 is formed by cutting and raising the middle, upper and lower side walls inward. The door piece 36 extends upward (to the right in FIG. 2), that is, extends obliquely toward the core supply hole 33 and comes into contact with each other.
A is formed. The lid 36A is in close contact with the tapered opening edge of the protruding portion, and the core supply hole 3A.
3 is completely closed in its natural state.

The refill cartridge 30 has a pressing portion 37 projecting from the upper end thereof.
The pressing portion 37 is configured to protrude from the cylindrical case 21 in a state where is stored in the cartridge housing chamber 23. When the pressing portion 37 is pressed, the lead accommodating portion 22 is pressed downward via the extra lead cartridge 30,
As in the conventional case, the pencil lead in the lead accommodating portion 22 is fed out from the lower end by the feeding mechanism.

Next, the operation of the present embodiment will be described. Prior to mounting the refill cartridge 30 on the pencil body 20, the lid 36A
Are in close contact with the opening edge of the protruding portion 34, and the core supply hole 33 is in a closed state (see FIG. 2). Therefore, in this state, even if the refill cartridge 30 is inclined obliquely or the mounting portion 32 side is directed downward, the refill core B does not come off.

In order to supply the extra lead B into the lead receiving portion 22,
Insert the refill cartridge 30 into the insertion port 23A from the mounting section 32 side.
Into the cartridge accommodating chamber 23 via the And it pushes in until the upper end part of the core accommodating part 22 is press-fitted in the mounting hole 35. Then, on the way, the upper end portion of the lead accommodating portion 22 abuts against the inclined surface of each door piece 36, and the door piece 36 is pushed and spread by the upper edge of the lead accommodating portion 22 with the insertion of the refill cartridge 30.

Then, with the core supply hole 33 opened, the protruding portion 34 is inserted into the core accommodating port 22A of the core accommodating portion 22. Thereby, the extra lead B in the extra lead storage section 31 is supplied into the lead storage section 22 through the opened lead supply hole 33 (see FIG. 3). In the present embodiment, the core supply hole 33 is formed slightly larger in diameter than the replacement core B, and the replacement cores B are supplied one by one.

When the leading end of the lead receiving portion 22 comes into contact with the base of the projecting portion 34, the upper end portion of the lead receiving portion 22 is clamped by the door pieces 36 which are spread out, and the refill lead cartridge 30 is placed in its mounted state. Will be retained. Thereby, extra lead B
Is completed.

As described above, in the present embodiment, the extra lead B can be supplied into the core accommodating portion 22 only by inserting the extra lead cartridge 30 into the cartridge accommodating chamber 23.
Therefore, unlike the related art, it is not necessary to manually take out the refills one by one from the small case or the like, and the refills can be easily supplied without breaking the refills. It works.

When the refill lead cartridge 30 is detached from the pencil main body 20, the refill lead B is closed before the refill lead cartridge 30 is mounted on the pencil main body 20 because the refill lead cartridge 33 is closed. It can be prevented from slipping out of the core supply hole 33.

Further, since the door piece 36 for closing the core supply hole 33 is opened by the upper end of the core storage part 22, the core supply hole 33 is opened before the core storage part 22 is inserted into the mounting hole 35. The replacement core B is prevented from coming out at the time of mounting, and the replacement core B is securely inserted into the core receiving portion 22.
Can be supplied inside.

<Other Embodiments> The present invention is not limited to the above-described embodiments, and can be modified and implemented as follows, for example, and these embodiments also belong to the technical scope of the present invention. .

(1) In the above embodiment, the door piece 36 is pushed and opened at the upper end of the core accommodating portion 22 at the time of mounting. However, a cap-shaped lid is provided in the core supply hole, and the mounting is performed. In such a case, the operator may remove the lid and then attach the refill cartridge so that the refill does not come out of the refill supply hole.

(2) In addition, a sheet piece is attached to the lead supply hole to such an extent that the lead lead can be prevented from coming out, and when the lead lead cartridge is mounted, the sheet piece is pushed by the upper end of the lead receiving portion. The configuration may be such that the core is broken and the extra lead is supplied into the lead accommodating portion through the lead supply hole.

(3) In the above embodiment, the refill cartridge 30 is formed in a cylindrical shape. However, the present invention is not limited to this.
It may be a rectangular tube or the like.

(4) In the above embodiment, the door piece 36 is formed integrally by cutting and raising the side wall. However, the door piece is formed separately from the mounting portion or the like, and this is attached to the mounting portion. It may be something. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the entirety of the present embodiment.

FIG. 2 is a side sectional view showing a closed state of a core supply hole in the embodiment.

FIG. 3 is a side sectional view showing a state after the refill cartridge in the embodiment is mounted.

FIG. 4 is a perspective view showing a door piece of the embodiment.

FIG. 5 is a partially cutaway perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 20: Pencil main body 22: Lead accommodating part 30: Extra lead cartridge 33: Lead supply hole 36: Door piece (door)

Claims (3)

[Claims] 1. A pencil housing having a lead accommodating portion for accommodating a pencil lead in a pencil body, and displacing the lead accommodating portion along the pencil body to draw out a pencil lead in the lead accommodating portion from a lower end portion of the pencil body. A mechanical pencil having a configuration, wherein the pencil body is detachably provided with a refill cartridge containing a plurality of refills as pencil leads, and the refill cartridge is attached to the pencil body. And a lead supply hole for supplying the lead lead into the lead receiving portion. 2. A configuration in which a pencil accommodating portion for accommodating a pencil lead is provided in a pencil body, and the pencil lead in the lead accommodating portion is extended from a lower end portion of the pencil body by displacing the lead accommodating portion along the pencil body. A refill cartridge used for a mechanical pencil, capable of accommodating a plurality of refills as the pencil lead, and
A refill lead for a mechanical pencil, wherein the refill lead is provided detachably on the pencil main body, and is provided with a lead supply hole for supplying the refill lead into the lead accommodating portion while being attached to the pencil main body. cartridge. 3. The core supply hole is provided with a door that opens and closes the core supply hole, and the door is located at a position that closes the core supply hole when the refill cartridge is detached from the pencil body. 3. The refill cartridge for a mechanical pencil according to claim 2, wherein the refill cartridge is displaced to a position where the refill supply hole is opened in accordance with the mounting of the refill cartridge on the pencil body.