JPS62249799A - Switchgear for lead cartridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an opening/closing device for a lead cartridge of a cassette type mechanical pencil.

[Conventional technology]

Recently, for example, a so-called cassette type system, as shown in Figure 12, has been developed that replaces the entire cartridge containing writing leads, eliminates the need to refill each lead, and allows you to replace and replenish the leads without getting your hands dirty. A mechanical pencil is suggested.

Conventional cassette mechanical pencil lead cartridge 1
01 only has a cap 102 fitted to the tip, and when replacing or replenishing the lead of the mechanical pencil, first remove and discard the tip cap 102, and then remove the tip of the mechanical pencil with the tip of the lead cartridge open. Outer cylinder 10
It was fitted inside 3.

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

Therefore, when replacing the lead etc., always use the lead cartridge 101.
It was necessary to carefully fit it into the outer cylinder 103 while holding it upward.

Also, when removing the lead cartridge 101 from the outer cylinder 103, if the lead cartridge 101 is turned downward even slightly, it will pop out from inside the lead cartridge 101 and the outer cylinder 101 will be removed.
There was a problem that it remained within 3.

On the other hand, in the conventional one, as shown in Fig. 13, the core 104
A lead cartridge 101 containing a large number of lead cartridges 101 and a lead guide 105 into which the 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 chamfered part 107 is required on the inner surface of the tip, and the inner diameter of the outer cylinder 103 is As shown in the figure, it is necessary to provide an inner step wall 106 with a stepped shape, and this inner step wall 1
06 restricts the core cartridge 101 to a small diameter,
There was a problem that the core storage capacity became small. Also,
Since the outer cylinder 103 having the inner step wall 106 as described above cannot be extruded, it must be injection molded, and in this case, the problem is that the mold is more expensive than extrusion molding. was there.

This invention was made to solve the above-mentioned problem.The core heating hole opens only when the writing instrument is engaged with the writing instrument for replacing or replenishing the lead, and closes when the writing instrument is not engaged. This prevents the lead from popping out when replacing the lead cartridge, and
It is an object of the present invention to provide a lead cartridge opening/closing device that eliminates waste parts, enables extrusion molding of a writing instrument outer cylinder, and increases the lead storage capacity of the lead cartridge.

[Means for solving problems]

The opening/closing device for a lead cartridge according to the present invention is divided into a plurality of parts in the radial direction and is provided in the lead cartridge with an inward elastic force, and the core warming hole opens when the lead cartridge is elastically engaged with the lead guide. It closes when there is non-coordination.

[Effect]

The opening/closing mechanism according to the present invention is formed so that the core warming hole opens when the lead guide is elastically engaged, and closes when the lead guide is not engaged. Of course, if the lead is held by the lead chuck and protrudes from the lead guide, it goes without saying that the lead will open the core warming hole even before the lead is elastically engaged with the lead guide.

〔Example〕

First, in the first part, 1 is the outer barrel of the mechanical pencil, 2
3 is a part of the lead delivery mechanism disposed inside the outer cylinder 1, and has a lead chuck 5 for spraying the lead 4. A lead guide 6 is fitted to the rear end of the chuck 5. Here 1. Of course, a chuck joint between the lead chuck 5 and the lead guide 6 may be added to the design.

The lead guide 6 has a front cylindrical portion 6 as shown in the second figure.
0, a rear inner cylinder part 61 extending coaxially rearward from the rear end of the front cylinder part 60, and a rear inner cylinder part 61 extending coaxially rearward from the rear end of the front cylinder part 60 longer than the rear inner cylinder part 61. , and a fitting cavity 6 having an annular cross section between the outer peripheral surface of the rear inner cylindrical portion 61
2 and a rear outer cylindrical portion 63.

Such a lead guide 6 connects the lead 4 to the lead chuck 5.
A fitting hole 64 for the rear end of the lead chuck 5 is provided at the front end of the front cylinder part 60, and the front cylinder part 60 and the rear inner cylinder part 61 are connected to the fitting hole 64.
A core feed hole 65 is coaxially formed with the core 4 and has an inner diameter through which only one core 4 can be fed out. Further, the rear inner cylindrical portion 61 is provided with an outer wall tapered portion 66 at the rear end, and a large diameter step-shaped rear fitting hole 6 is provided inside the rear side of the rear outer cylindrical portion 63.
7 is provided.

The inner circumferential wall of the rear 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 lead cartridge 7. may be provided.

A lead cartridge 7 is removably fitted into the lead guide 6 via a chuck-type opening/closing mechanism 8.

This chuck type opening/closing mechanism 8 is divided into two parts in the diametrical direction as shown in FIG. 3(a), divided into two parts in an offset manner as shown in FIG. Chuck opening/closing member 80°81, (8
Consists of 1a).

These chuck opening/closing members 80. 81. (81a)
are assembled together, and the rear side fitting part 82 is fitted into the tip opening of the lead cartridge 7, and the chuck opening/closing member 80. is attached to the opening end. 81. (81a) Outer flange 83
are in conflict.

Such a chuck opening/closing member 80. 81. (81a) shows the cores 4 (with the same core diameter) in the above-mentioned combined state.
For example, 0.5 Tsuru only, 0.7 Drunken only, 0.9 Tsuru only)
Or 4 cores with different core diameters (for example 0, 5 am and 0
．． A core conduction hole 84 having an inner diameter capable of conducting a dual purpose (7 mm) is formed in the shaft center portion. That is, (2) When used only for leads 4 having the same core diameter, the lead conduction hole 84 has a diameter of, for example, 0.5f1.0.7+n when engaged with the lead guide 6.

It is formed in a size that allows only one type of core 4 such as 0.91 m to pass through. ■Next, the core 4 of different diameter (for example, 0.5
When the lead conduction hole 84 is used for both the lead (Tsuru and 0.7 Tsuru lead), the lead conduction hole 84 should have an opening size that allows conduction to either lead 4 when engaged with the lead guide 6. When the connection is released, each core 4 is formed to be deformable to an opening amount that does not allow conduction. An elastic opening/closing piece 86 having an inner wall tapered portion 85 is provided on the distal end side of the core conduction hole 84, and a fitting hole 87 at the distal end of the inner wall tapered portion 85 is connected to the lead guide 6.
It is elastically engaged with the rear inner cylindrical portion 61 of. At the time of this engagement, the core conduction hole 84 opens.

That is, the chuck opening/closing member 80. 81. (81a
) is one in which the elastic opening/closing piece 86 side has an inward elastic force when the rear side fitting part 82 is fitted to the lead cartridge 7, and the tip fitting hole 87 is connected to the lead guide 6. When not elastically engaged with the rear inner cylindrical portion 61, the elastic opening/closing piece portion 86 and the core through hole 84 are closed by the elastic force. Therefore, from this state, the rear inner cylindrical portion 61 of the lead guide 6
and the chuck opening/closing member 80. 81. By press-fitting the tip fitting hole 87 of (81a), the elastic opening/closing piece 86
At the same time as the core conducting hole 84 opens against the inward elastic force, the tip fitting hole 87 is resiliently engaged with the rear inner cylinder portion 61.

Next, the operation will be explained.

When removing the lead cartridge 7 fitted to the lead guide 6 along with the opening/closing mechanism 8 to replace the lead or to check the lead midway through, the lead conduction hole 84 is automatically closed to a diameter of, for example, 0.5 fi or less. The core 4 is closed to a diameter where conduction is impossible.

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 through 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 lead occurring, there is no need to provide a chamfer such as a taper on the inner surface of the tip of the lead cartridge 7.
There is also no manufacturing problem such as insufficient resin flow due to the thin inner wall of the tip when the core cartridge 7 is molded. Also,
Since it is no longer necessary to provide an inner step wall inside the outer cylinder 1 as in the conventional case, the outer cylinder 1 can be formed by inexpensive extrusion molding, and the diameter of the core cartridge 7 can also be increased. The amount of core storage can also be dramatically increased.

In addition, if the core 4 remains across the core feed hole 65 of the rear inner cylindrical portion 61 and the core conduction hole 84 of the opening/closing mechanism 8, this remaining core 4 will be removed when the opening/closing mechanism 8 is removed. Chuck opening/closing member 80. 81. (81a) Elastic opening/closing piece 8
Due to the elastic closing action of 6, the core is chucked at the conductive hole 84 and pulled out. Therefore, after removing the lead cartridge 7, if you pull out the lead 4 from the lead passage hole 84 or push it into the lead cartridge 7, the remaining lead 4 will break when the lead cartridge 7 is replaced. There is no risk that the broken core 4 will cause the lead guide 6 to become clogged.

Then, when a new lead cartridge 7 is pushed in from the rear end of the outer cylinder 1, the tip fitting hole 87 of the opening/closing mechanism 8 is press-fitted into the rear inner cylinder part 61 of the lead guide 6 and snaps into engagement. , the lead passage hole 84 of the opening/closing mechanism 8 is opened, and the lead 4 can be supplied. When replacing the lead cartridge 7 like this, the lead passage hole 84 is closed until the tip fitting hole 87 is inserted into the rear inner cylindrical part 61, so the lead 4 in the lead cartridge 7 can be replaced as before. There is no risk of it popping out. In addition, since there is no need to hold the mechanical pencil upside down and maintain the lead cartridge 7 upward while replacing the lead cartridge 7, the replacement work of the lead cartridge 7 can be performed extremely simply, easily, and efficiently regardless of the orientation of the mechanical pencil. .

In particular, the opening/closing mechanism 8 includes a plurality of chuck opening/closing members 80 .
81. (81a) are combined and their elastic opening/closing pieces 86 have an inward elastic force and can open and close in the radial direction. The stored new lead cartridge 7 can be attached to the lead guide 6 in the manner described above to enable the supply of the new lead 4.

That is, the opening/closing mechanism 8 can be used for cores 4 of the same diameter only or of different diameters by adjusting the opening/closing degree of the elastic opening/closing piece 86 and the core warming hole 84 by its own elastic force.

4 to 7 show a second embodiment of the invention,
Unlike the first embodiment described above, the chuck type opening/closing mechanism 8 is housed inside the lead cartridge 7 via the rear fitting part 82.

The chuck opening/closing members go and si of this embodiment are shown in FIG.
Diametrically staggered 2 as shown in a) and (c)
A pair of claw portions 80A and 81A are formed in order to provide more effective elastic opening/closing restoring force.

Note that the number of claws is not limited to one pair, and a larger number may be provided. Each chuck opening/closing member 80.
An annular groove 88 is formed on the outer circumferential surface of the elastic opening/closing piece 86 on the tip side of 81.
An elasticity imparting member 89 is provided in the annular groove 88 to bias the elastic opening/closing piece 86 in the diametrical direction to close the core warming hole 84 .

The elasticity imparting member 89 in the illustrated example is made of an O-ring, but is not limited to this, and includes, for example, a washer, a synthetic resin, a C-ring, etc.
Any material having elastic force in the radial direction, such as a ring, may be used.

This elasticity imparting member 89 has cores 4 of the same diameter or different diameters.
The opening/closing mechanism 8 urges the elastic opening/closing piece 86 to enable conduction.

That is, when the diameters of the cores 4 that conduct the opening/closing mechanism 8 are the same diameter, and when they are different diameters, for example, 0.5 +n and 0.7
In the case of m, the core heating hole 84 in the elastic opening/closing piece part 86 is 0.
．． The elasticity imparting force of the elasticity imparting member 89 is set so as to close to 5+n or less. For this reason, there is no possibility that the core 4 having any of the core diameters will pop out when the core warming hole 84 is closed.

Note that it is not always necessary to provide the elasticity imparting member 89 such as an O-ring in the annular groove 88. For example, the body of the opening/closing mechanism 8 may have a curved cross-sectional area as shown in FIGS. 4 to 6. By forming the opening/closing mechanism 8 to change
However, due to its own elasticity, it can be opened and restored as well. Moreover, in this embodiment, since the claw portions 80A and 81A are provided, the elastic opening/closing restoration can be performed more reliably. Note that, as shown in FIG. 7(b), a protrusion 82a is provided on the outer periphery of the rear fitting portion 82 to ensure fitting with the lead cartridge 7. Also, in this example,
The opening/closing mechanism 8 is divided into two parts in the diametrical direction in a staggered manner. This includes chuck opening/closing members 80, 81. (81
a) If the slit width between them and the hole diameter of the core warming hole 84 are similar, or if the slit width is larger than the hole diameter, the hole diameter of the core warming hole 84 is only small due to the slit width. Since there is no or no remaining, the hole diameter of the core warming hole 84 can be obtained by making the chuck opening/closing members 80° 81 and (81a) staggered. moreover,
Figure 3(a).

As shown in (c), the opening/closing mechanism 8 may be divided into a plurality of parts, such as two or three, without being in a staggered state.

Since the opening/closing mechanism 8 is divided into a plurality of parts in this way, the opening/closing operation of the elastic opening/closing piece 86 becomes large. Therefore, as shown in FIG. 3, when the core warming hole 84 is opened by elastically engaging the elastic opening/closing piece 86 of the opening/closing mechanism 8 with the rear inner cylinder section 61 of the lead guide 6, the core of the same diameter is opened. Smooth supply is possible not only in the case of , but also in the case of cores of different diameters.

FIG. 8 shows a third embodiment of the present invention, which differs from the second embodiment described above only in that the opening/closing mechanism 8 does not have a claw portion at the tip. Similarly to the second embodiment, the elasticity imparting member 89 is not necessarily required.

Furthermore, FIG. 9 shows a fourth embodiment of the present invention, and a second
The only difference from this embodiment is that it is attached protrudingly to the tip of the lead cartridge 7 and that it does not have a claw. Similarly, the elasticity imparting member 89 is not necessarily an essential element.

10 and 11 show a fifth embodiment of the invention.

The opening/closing mechanism 8 of this embodiment is divided into three parts in the diametrical direction.
Chuck opening/closing member 80 divided into two or more parts. 81
．． (81a), these chuck opening/closing members 80
．． 81. (81a) is in a combined state, and by fitting the rear side fitting part 82 into the lead cartridge 7, the entire chuck opening/closing member 80.81 is opened to the lead cartridge 7.
It is stored inside the tip side of the.

Each chuck opening/closing member 80. 81. (81a
) are provided with protrusions 80B and 81B having a semicircular arc cross section for adjusting the degree of opening and closing of the elastic opening/closing piece 86.

These protrusions 80B and 81B are in contact with the inner circumferential surface of the lead cartridge 7 to increase the inward elastic force of the elastic opening/closing piece 86, and the tip fitting hole 87 is connected to the rear inner cylinder of the lead guide 6. The engagement force when elastically engaged with the portion 61 is increased.

At the time of the above-mentioned snapping engagement, the 8 conductive holes 84 are opened as in the previous embodiment, so that it is possible to supply the cores 4 with different core diameters.

〔Effect of the invention〕

As described above, according to the present invention, the lead cartridge is divided into a plurality of parts in the radial direction and has an inward elastic force, and is provided in the lead cartridge, and when the lead cartridge is elastically engaged with the lead guide, the eight conductive holes are opened, and the non-retention Since it is equipped with a chuck-type opening/closing mechanism that closes when necessary, there is no risk of the lead popping out when replacing the lead cartridge, and when replacing the lead cartridge, the chuck-type opening/closing mechanism closes to prevent the lead from remaining in the writing instrument. Therefore, the lead cartridge can be replaced very simply and easily without the risk of breaking the remaining lead or clogging the writing instrument due to the broken lead.

In particular, the opening/closing mechanism described above makes it possible to create a lead cartridge that shares not only the same diameter but also different diameter leads, eliminates waste parts such as the cap of conventional lead cartridges, and reduces the thickness of the outer cylinder. Since there is no need to provide a wall with a stepped wall, it is possible to extrude the outer cylinder of the writing instrument.
Many excellent effects can be obtained, such as increasing the lead storage capacity of the lead cartridge.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a cassette-type mechanical pencil according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the main part of the mechanical pencil where the lead cartridge is attached, and Fig. 3 shows each opening/closing part of the main part. 4 is a sectional view of the opening/closing mechanism 8 of the second embodiment engaged with the lead guide, FIG. 5 is a sectional view of the opening/closing mechanism, and FIG. 6 is a sectional view of the opening/closing mechanism of FIG. "A partially sectional plan view in a rotated state, FIG. 7(a) is a sectional view taken along line A--Al in FIG. Figure (c) is a sectional view taken along the line CC in Figure 6, and Figures 8 and 9 are the third and fourth cross-sectional views of the invention.
10 is a partially sectional plan view of the fifth embodiment of the present invention; FIG. 11 is an engagement sectional view of the fifth embodiment;
FIG. 12 is a perspective view of a conventional lead cartridge, and FIG. 13 is a longitudinal sectional view of a conventional mechanical pencil of this type. In the figure, 4 is a lead, 6 is a lead guide, 7 is a lead cartridge, 8 is a chuck-type opening/closing mechanism, and 84 is an 8-conducting hole.

Claims (1)

[Claims] A lead cartridge (7) that is removably fitted into the mechanical pencil to replenish and replace the lead (4), and a lead cartridge (7) that is divided into multiple parts in the radial direction and has an elastic force inwardly. A lead cartridge opening/closing device comprising a chuck-type opening/closing mechanism (8) that opens a lead conduction hole (84) when elastically engaged with a lead guide (6) and closes when not engaged.