JPH11151889A - Refill case for mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent carrying property, replenishing property for cores, and exchangeability for parts by a method wherein a tail plug is fixed to the rear end of a barrel cylinder where cores are housed, and a detachable clip is attached to a case main body wherein a tapered part is formed at the front end, and the diameter is smaller than the internal diameter of a core tank, and a core inlet/outlet hole of which the diameter is larger than the outer shape of the cores is provided at the tip end. SOLUTION: This refill case for mechanical pencil comprises a main body l and a cap 10. The main body 1 comprises a barrel cylinder 2 which houses cores L inside, a tail plug 3 which is fixed to the rear end of the barrel cylinder 2 and a tip member 4 which is fixed to the front part of the barrel cylinder 2, and is formed into a tapered shape to the forward side, and wherein the tip end outer diameter of the tapered part 5 is smaller than the internal diameter of the core tank of a mechanical pencil, and a core inlet/outlet hole of which the diameter is larger than the outer diameter of the core is provided at the center of the tip end. Since this refill case has a cap having a clip, it is excellent in carrying property, and also, is excellent in the replenishing property of cores, and in addition, for the barrel cylinder and the cap part, parts of other writing utensils such as a ball-point pen can be used, and it is excellent in the exchangeability of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refill lead case, and more particularly, to a refill lead case for a mechanical pencil which is excellent in portability, refillability of the lead to the mechanical pencil, and excellent use of parts.

[0002]

2. Description of the Related Art In most cases, conventional refillable core cases are formed into a rectangular parallelepiped shape using a synthetic resin.

[0003]

[0005] If the portable pencil is stored in a pocket or a pencil case, it can be carried, but the lead in the lead tank of the mechanical pencil which has forgotten the rabbit corner is lost, and the lead cannot be refilled. In addition, the conventional refillable lead case generally takes out a desired amount from the lead case and replenishes it to the lead tank of the mechanical pencil, and replenishment is troublesome. It should be noted that an ampule type case for storing a liquid chemical or the like is also known, but it is merely convenient for refilling the lead tank of the mechanical pencil, and the portability is not considered. .
Further, in recent years, resource saving has been called for, but there has been a problem that the conventional refill case cannot be shared with other products, for example, writing implement parts, as a whole and parts.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pencil lead replacement case excellent in portability, refillability of the lead to the mechanical pencil, and excellent use of parts. A barrel for storing the core, a tail plug fastened to the rear end of the barrel, and fastened to the front of the barrel, tapered forward, and the outer diameter of the tapered tip is It is smaller than the inner diameter of the lead tank of the mechanical pencil,
A refill lead case for mechanical pencils, comprising a case body consisting of a tip member having a center access hole with a diameter larger than the outer shape of the lead at the center of the tip, and a cap with a detachable clip and a barrel of the case body. I do.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The refill lead case for a mechanical pencil of the present invention comprises a main body 1 and a cap 10.
And The main body 1 has a shaft cylinder 2 in which a core L (a black core or a color core) is housed, and is fixed to a rear end of the shaft cylinder 2 (press-fit in the illustration).
The tail plug 3 is fixed to the front of the barrel 2 and has a tapered shape toward the front. The outer diameter of the tapered portion 5 is smaller than the inner diameter of the core tank 13 of the mechanical pencil S (see FIG. 3). And a tip member 4 having a core access hole 6 having a diameter larger than the outer shape of the core at the center of the distal end portion.

The shaft cylinder 2 is made of a synthetic resin or metal, but a transparent synthetic resin, for example, a polyethylene terephthalate resin is preferable in view of improving the aesthetic appearance of the core housed therein. The tail plug 3 is made of a synthetic resin or metal, but is preferably colored from the viewpoint of improving the aesthetic appearance.
In the case of coloring, it is more preferable to make the color the same as the color of the core. Further, the tail plug 3 can be made of an eraser (preferably an elastomer type in which the plasticizer contained in the eraser is less likely to migrate to the barrel 2). The tip member 4 is provided with a small-diameter portion via a step portion in front of the barrel 2 in the drawing, and is screwed to the outer surface of the small-diameter portion, and is made of synthetic resin or metal. In terms of improvement, a transparent synthetic resin, for example, a polyethylene terephthalate resin is preferable. It is preferable that an inclined step 7 is formed at the rear end of the center entry / exit hole 6 of the tip member 4. The reason for this is that in the case of a simple step without the inclined step, the tip member 4 is lowered. When refilling the lead in the lead tank of the mechanical pencil toward the center, the lead falls into the internal space 8 of the tip member 4 at a time, and becomes entangled, making it impossible to discharge the lead from the lead hole 6 (FIG. 4). This is to prevent this as much as possible (see FIG. 5).
In order to minimize the entanglement of the core in the internal space 8 of the tip member 4 when refilling the lead into the lead tank of the mechanical pencil, a stair-like step 9 may be connected behind the inclined step 7 (FIG. 6, 7). Further, it is preferable that the size of the cross-section of the core access hole 6 of the tip member 4 be such that only one core can be inserted and removed, since it is possible to replenish the core tank of the desired number of mechanical pencils (see FIG. 8). .

The cap 10 has a clip 11 and is removably fastened to the barrel 2 of the main body 1. The cap 10 is made of synthetic resin or metal. Terephthalate resins are preferred. It is preferable to arrange a packing 12 made of silicon rubber or the like that closes the core access hole 6 when the cap 12 is fixed to the barrel 2 of the main body 1. The reason is that the core housed in the shaft cylinder 2 projects into the cap 10 through the core access hole 6 when carrying, etc., so that breakage of the core due to impact or the like is prevented as much as possible. In addition, the packing 12 is preferably colored in the sense of improving aesthetic appearance, and in the case of coloring, it is more preferable to color the packing 12 in the same color as the core plug, like the tail plug 3 described above.

[0008]

The replacement lead case for a mechanical pencil according to the present invention comprises a barrel for accommodating the lead, a tail plug fixed to the rear end of the barrel, and a tapered shape fixed to the front of the barrel and facing forward. A case body comprising a tip member having an outer diameter of the tapered tip smaller than the inner diameter of the lead tank of the mechanical pencil and having a center access hole having a diameter larger than the outer shape of the lead at the center of the leading end; It consists of a shaft cylinder and a detachable cap with clip, that is, it has excellent portability because it has a cap with clip, and the tip member is tapered forward.
The outer diameter of the tapered tip is smaller than the inner diameter of the lead tank of the mechanical pencil, and the center of the leading end portion has a core access hole with a diameter larger than the outer shape of the lead, so that the refillability of the lead to the mechanical pencil is excellent. As the cylinder and the cap parts, parts of other writing utensils such as a ball-point pen can be used, so that there is an effect that the commonality of parts is excellent.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal front view showing an embodiment of a refill lead case of the present invention.

FIG. 2 is a longitudinal sectional view of a tip member.

FIG. 3 is a perspective view showing a state where a lead is supplied to a lead tank of a mechanical pencil.

FIG. 4 is a view for explaining a phenomenon that occurs in a tip member when refilling a lead into a lead tank of a mechanical pencil.

FIG. 5 is a view for explaining the situation inside the tip member when refilling the lead into the lead tank of the mechanical pencil.

FIG. 6 is a diagram corresponding to FIG. 2, showing another example.

FIG. 7 is a view corresponding to FIG. 5, showing another example.

FIG. 8 is a view for explaining a preferred state of discharging a lead from a lead hole of a tip member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Shaft cylinder 3 Tail plug 4 Tip member 5 Tapered part 6 Core access hole 7 Inclined step part 8 Internal space 9 Stepped step part 10 Cap 11 Clip 12 Packing 13 Core tank L Core S Mechanical pencil

Claims (8)

[Claims] 1. A shaft cylinder for accommodating a core, a tail plug fixed to a rear end of the shaft cylinder, a front stopper fixed to a front of the shaft cylinder, and having a tapered shape facing forward. A case body consisting of a tip member having a center access hole at the center of the tip, which is smaller than the inner diameter of the core tank of the mechanical pencil and larger than the outer shape of the core, and a cap with a clip that is detachable from the shaft cylinder of the case body Replacement lead case for mechanical pencil. 2. A packing for closing a core access hole when fixed to a shaft cylinder of a case body is disposed in the cap.
Replacement lead case for mechanical pencil as described. 3. The replacement lead case for a mechanical pencil according to claim 2, wherein the barrel, the tip member, and the cap with clip are made transparent, and the tail plug and the packing are colored. 4. The refill lead case for a mechanical pencil according to claim 3, wherein the colors of the tail plug and the packing are the same color as the color of the lead housed in the barrel. 5. The tail plug is made of an eraser.
A refill case for a mechanical pencil according to any one of the above. 6. The refill lead case for a mechanical pencil according to claim 1, wherein an inclined step portion is provided at a rear end of the center access hole of the tip member. 7. The refill lead case for a mechanical pencil according to claim 6, wherein a stepped step portion is continuously provided behind the inclined step portion. 8. The refill lead case for a mechanical pencil according to claim 1, wherein only one lead can enter and leave the lead hole of the tip member.