JPH045348Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an opening/closing device for a lead cartridge of a cassette type mechanical pencil.

[Conventional technology]

Recently, for example, the so-called cassette type cartridge, which stores writing leads as shown in Figure 4, has been replaced, eliminating the need to refill each lead individually and allowing the replacement and refilling of writing leads without getting your hands dirty. A mechanical pencil is suggested.

The lead cartridge 101 of a conventional cassette-type mechanical pencil only has a cap 102 fitted on the tip, and when replacing or replenishing the lead of a mechanical pencil, first remove the tip cap 101 and discard it, then replace the lead cartridge. It was fitted into the outer cylinder 103 of the sharp pencil with the tip open.

Therefore, if the lead cartridge 101 is turned downward even slightly after the tip cap 102 is removed, there is a problem in that the lead 104 will pop out from inside the lead cartridge 101.

Therefore, when replacing the core, it is necessary to always hold the core cartridge 101 upward while carefully fitting it into the outer cylinder 103.

Further, when removing the lead cartridge 101 from the outer cylinder 103, there was a problem that if the lead cartridge 101 was turned downward even slightly, it would fly out from inside the lead cartridge 101 and remain in the outer cylinder 103.

On the other hand, in the conventional one, as shown in FIG. 5, a lead cartridge 101 storing a large number of leads 104,
A lead guide 105 into which this lead cartridge 101 is removably inserted is housed in the outer cylinder 103, so in order to pick up the remaining lead in the outer cylinder 103 with the lead cartridge 101, a tapered inner surface of the tip is provided. The chamfered portion 107 is necessary, and the outer cylinder 1
As shown in the figure, it is necessary to provide an inner stepped wall 106 with a stepped shape, and this inner stepped wall 106 restricts the lead cartridge 101 to a small diameter, reducing the lead storage capacity. There was a problem. Moreover, the inner step wall portion 10 as described above
Since the outer cylinder 103 having the number 6 cannot be extruded, it must be injected and extrusion molded.In this case, there is a problem that the mold is more expensive than extrusion molding.

This idea was made to solve the above problem, and the lead passage hole opens only when the writing instrument is engaged with the writing instrument for replacing or replenishing the lead, and closes when it is not engaged. To provide an opening/closing structure for a lead cartridge that prevents the lead from popping out when replacing the lead cartridge, eliminates waste parts, enables extrusion molding of a writing instrument outer cylinder, and increases the lead storage capacity of the lead cartridge. With the goal.

[Means for solving problems]

The core cartridge opening/closing device according to this invention is
An opening/closing mechanism made of an elastically deformable member is provided at the tip of the lead cartridge, in which a plurality of lead conduction holes are opened in alignment when engaged with a lead guide, and a plurality of lead conduction holes are closed in a staggered manner when disengaged.

[Effect]

The opening/closing mechanism in this invention is formed so that it can be elastically deformed so that the plurality of lead conduction holes open in alignment when engaged with the lead guide, and close in a staggered manner when disengaged. Of course, if the lead is held in the lead chuck and protrudes from the lead guide, it goes without saying that the lead opens the lead passage hole even before the lead is elastically engaged with the lead guide.

〔Example〕

First, in FIG. 1, 1 is the outer barrel of the sharpening pencil, 2 is the tip screwed onto the tip of the outer barrel 1, and 3 is the outer barrel of the sharpening pencil.
is a part of the lead delivery mechanism disposed inside the outer cylinder 1, and has a lead chuck 5 for biting the lead 4, and a lead guide 6 is fitted to the rear end of the lead chuck 5. . Here, it is of course possible to add a chuck joint between the lead chuck 5 and the lead guide 6 to the design.

As shown in the second figure, the lead guide 6 includes a front cylindrical portion 60 and a rear outer cylindrical portion 63 extending coaxially rearward from the rear end of the front cylindrical portion 60.

The lead guide 6 has a function of feeding the leads 4 to the lead chuck 5 one by one, and a fitting hole 64 for the rear end of the lead chuck 5 is provided at the front end of the front cylindrical portion 60. Inside, a core feed hole 65 is formed coaxially with the fitting hole 64 and has an inner diameter through which only one core 4 can be fed out. Further, a large-diameter step-shaped rear fitting hole 67 is provided inside the rear side of the rear outer cylindrical portion 63 . Inside the rear outer cylindrical portion 63, there is a tapered inner wall 68 that guides a core stopper piece 8A, which will be described later, when engaged, and a core stopper piece 8A guided by this tapered inner wall 68, which is engaged with the core stopper piece 8A, which will be described later. The engaging hole 6 opens the two core conduction holes 84A and 84B in a matching manner.
It has 9.

The inner circumferential wall of the rear side fitting hole 67 is provided with a plurality of holes (not shown) or a protruding rib (not shown) for smooth attachment and detachment with the core cartridge 7. may be provided.

A lead cartridge 7 is removably fitted into the lead guide 6 via an opening/closing mechanism 8.

The opening/closing mechanism 8 is made of an elastically deformable material such as rubber or synthetic resin, and is fitted into the opening at the tip of the core cartridge 7 . As shown in FIGS. 2 and 3, this opening/closing mechanism 8 has a cylindrical shape that is fitted into the opening at the tip of the core cartridge 7 and has a first core passage hole 84A in its axial center. Main body 8B and
It is integrally connected to the tip side of this main body 8B in a bent shape,
A second core conduction hole 84A is located at a position that is different from the first core conduction hole 84A.
The core stopper piece 8A has a core conduction hole 84B formed therein.

Here, the first and second core conduction holes 84A, 8
4B is the core 4 with the same core diameter (for example, 0.5mm only,
0.7mm only, 0.9mm only) or 4 cores with different core diameters
(for example, 0.5 mm and 0.7 mm). That is, when used only for cores 4 having the same core diameter, the core conduction hole 84
A and 84B are formed in a size that allows only one type of core 4, such as 0.5 mm, 0.7 mm, or 0.9 mm, to pass through when engaged with the lead guide 6. Next, if the cores 4 of different diameters (for example, 0.5 mm and 0.7 mm cores) are to be used together, the core conduction hole 84A,
84B is formed to have a matching opening size that allows conduction between any of the cores 4 when engaged with the lead guide 6.
Further, the opening positions of both holes 84A and 84B are closed at staggered positions so that conduction is impossible to any of the cores 4 when the engagement with the lead guide 6 is released.

Next, the operation will be explained.

First, when the lead cartridge 7 and the lead guide 6 are not engaged, the opening/closing mechanism 8 opens the first and second lead conducting holes 84A and 84B opened in the main body 8B and the lead stopper piece 8A, as shown in the second figure. The cores are located in a mismatched state where conduction is impossible.

Next, when the lead cartridge 7 is removed from the lead guide 6 along with the opening/closing mechanism 8 in order to replace the lead or to check the lead midway from the state shown in FIG. The core stopper piece 8A moves to the second illustrated position, and the two core conduction holes 84A and 84B are closed in a staggered manner, making it impossible for the core 4 to conduct. Therefore, when the lead cartridge 7 is pulled out, there is no risk that the lead 4 in the lead cartridge 7 will come off from the opening at its tip and remain in the outer cylinder 1 or spill out of the outer cylinder 1. Furthermore, since there is no risk of residual core occurring, there is no need to provide a chamfer such as a taper on the inner surface of the tip of the core cartridge 7.
There is no manufacturing problem such as insufficient resin flow due to the thin inner wall of the tip when the core cartridge 7 is molded. Furthermore, unlike in the past, it is no longer necessary to provide an inner stepped wall inside the outer cylinder 1, so the outer cylinder 1 can be formed by inexpensive extrusion molding, and the diameter of the core cartridge 7 can also be reduced. It can be made thicker and the amount of core storage can be increased dramatically.

In addition, if the core 4 remains across the core feed hole 65 and the two core conduction holes 84A and 84B of the opening/closing mechanism 8, this remaining core 4 will be used to connect the two cores when the opening/closing mechanism 8 is removed. Due to the elastic staggered closing action of the holes 84A, 84B, the lead 4 is chucked and pulled out through the lead conducting holes 84A, 84B.

Therefore, after removing the lead cartridge 7,
If you pull it out from the lead passage holes 84A, 84B or push it into the lead cartridge 7, the remaining lead 4 may break when replacing the lead cartridge 7, or the broken lead 4 may There is no possibility that the lead guide 6 will become clogged.

Then, when a new lead cartridge 7 is pushed in from the rear end of the outer cylinder 1, the lead stopper piece 8A of the opening/closing mechanism 8 is press-fitted into the fitting hole 69 of the lead guide 6 and snap-fitted, thereby causing the opening/closing mechanism 8 core conduction hole 84
A and 84B are opened to match and the core 4 can be supplied. When replacing the core cartridge 7, the two core conduction holes 84A and 84B are opened at different positions to prevent conduction of the core until the core stopper piece 8A is inserted into the fitting hole 69. There is no risk that the lead 4 in the lead cartridge 7 will pop out. In addition, since there is no need to hold the sharp pencil upside down and maintain the lead cartridge 7 upward during the replacement work, the replacement work of the lead cartridge 7 can be performed extremely simply, easily, and efficiently regardless of the orientation of the sharp pencil. .

In particular, the opening/closing mechanism 8 is formed of an elastically deformable member, and the two core conduction holes 84A and 84B open and close by their own elastic movement to enable core conduction. A new lead cartridge 7 containing a different lead 4 can be attached to the lead guide 6 in the manner described above to enable supply of the new lead 4.

That is, the opening/closing mechanism 8 can be used for only cores 4 of the same diameter or of different diameters by adjusting the opening/closing degree of the core passage holes 84A, 84B by force.

[Effect of idea]

As described above, according to this invention, the opening/closing mechanism elastically deforms so that the plurality of lead conduction holes open in alignment when engaged with the lead guide, and the plurality of lead conduction holes open in a staggered manner when not engaged. Therefore, there is no risk of the lead popping out when replacing the lead cartridge, and the chuck opening/closing mechanism closes when replacing the lead cartridge, allowing the lead remaining in the writing instrument to be removed. ,
The lead cartridge can be replaced very simply and easily without the risk of breakage of the remaining lead or clogging of the writing instrument due to the broken lead.

In particular, the opening/closing mechanism allows the core cartridge to share cores of not only the same diameter but also different diameters, eliminates waste parts such as the cap of conventional core cartridges, and eliminates the need for discarded parts such as the cap of the conventional core cartridge. Since there is no need to provide a thick step wall, it is possible to extrude the outer cylinder of the writing instrument, increase the lead storage capacity of the lead cartridge, and many other excellent effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a cassette-type mechanical pencil to which an embodiment of this invention is applied, Fig. 2 is a longitudinal sectional view of an embodiment of this invention immediately before the lead guide is engaged, and Fig. 3 is the same. 4 is a perspective view of a conventional lead cartridge, and FIG. 5 is a longitudinal sectional view of a conventional sharp pencil of this type. In the figure, 4 is a lead, 6 is a lead guide, 7 is a lead cartridge, 8 is an opening/closing mechanism, 84A, 84B
is the core conduction hole.

Claims (1)

[Scope of utility model registration request] Lead 4 is removably fitted to the sharpening pencil.
A lead cartridge 7 for replenishing and replacing the lead cartridge 7, and a plurality of lead conduction holes 84A, 84B provided at the tip of the lead cartridge 7 when engaged with the lead guide 6.
An opening/closing device for a lead cartridge, comprising an opening/closing mechanism 8 made of an elastically deformable member in which the plurality of lead conduction holes 84A, 84B open in a matching manner and close in a staggered manner when disengaged.