JPS6359600A - Switchgear for lead cartridge - Google Patents

Abstract

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

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an opening/closing device for a lead cartridge of a cassette type mechanical pencil.

[Conventional technology]

Recently, for example, as shown in Fig. 24, a so-called cassette type system has been developed that replaces the entire cartridge 101 that houses the writing lead, eliminates the need to refill each lead, and allows the user to replace and replenish the lead without getting their hands dirty. Mechanical pencils are provided. Conventional cassette mechanical pencil lead cartridge 1
01 only has a cap 102 fitted on the tip, and when replacing or replenishing the lead of the mechanical pencil,
First, remove and discard the tip camp 102, and with the tip of the core cartridge open, as shown in Figure 25,
It was fitted into the outer cylinder 103 of the mechanical pencil. 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 cartridge 101. Therefore, when replacing the lead etc., always use the lead cartridge 101.
10 inside the outer cylinder while being careful while holding it upward.
It was necessary to perform fitting to 3. Furthermore, when removing the lead cartridge 101 from the outer cylinder 103, there was a problem in that if the lead cartridge 101 was turned downward even slightly, the lead 104 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. 25, 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 fitted.
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 stepped wall portion 106 as described above cannot be extruded, it must be injection molded, and in this case, there is a problem that the mold is more expensive than extrusion molding. . This invention was made to solve the above problems, and the lead thickness hole opens only when the writing instrument is press-fitted to replace or replenish the lead, and when the press-fit connection is released, the lead thickness hole opens. To provide a lead cartridge opening/closing device which prevents the lead from popping out when replacing the lead cartridge by closing the opening, eliminates waste parts, enables extrusion molding of a writing instrument outer cylinder, and increases the lead storage capacity of the lead cartridge. The purpose is to provide

[Means to solve the problem]

The opening/closing device for a lead cartridge according to the present invention has a chuck-type opening/closing mechanism that is radially U-divided and has an elastic force in an inward direction, and is provided on the lead cartridge in the inward direction when the lead cartridge is press-fitted into engagement. It moves diametrically inward against the elastic force to open the core thickness through hole, and when the press fit is released, it restores to the diametrically outward direction by the inward elastic force to open the core thickness through hole. It is provided with an outward engaging piece portion that closes the opening.

[For use]

In the lead cartridge opening/closing device of the present invention, when the outwardly engaging piece of the chuck-type opening/closing mechanism is press-fitted into the lead guide, the outwardly engaging piece moves diametrically inward and snaps into engagement with the lead guide. By doing this, the core thickness through hole is opened, and by pulling out the outwardly engaging piece from the lead guide, the outwardly engaging piece is restored and moved diametrically outward by an inward elastic force to close the core. The thick through hole closes. 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 lead thickness hole even before the lead is press-fitted into the lead guide.

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. First, in Fig. 1, 1 is the outer barrel of a mechanical pencil;
2 is a tip tool screwed onto the tip of the outer cylinder 1; 3 is a part of a 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 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. The lead guide 6 has a function of sending out the leads 4 one by one to the lead chuck 5, and as shown in FIGS. 2 and 3, the lead guide 6 has a front fitting hole 60 into which the rear end of the lead chuck 5 is fitted. A core feeding hole 61 with an inner diameter that is connected to the front fitting hole 60 and can feed only one lead 4, and a large diameter step-shaped chuck storage hole 62 that is connected to the rear end of this core feeding hole 61. , a large-diameter step-shaped rear fitting hole 63 is coaxially connected to the rear end portion and into which the lead cartridge 7 is removably fitted. The peripheral wall of the rear fitting hole 63 is provided with a number of holes (not shown) for smoothly attaching and detaching the lead cartridge 7. A lead cartridge 7 is removably fitted into the lead guide 6 via an opening/closing mechanism 8. The opening/closing mechanism 8 of the first embodiment has a rear cylindrical portion 80 whose rear side is fitted into the large diameter hole 7a at the tip of the lead cartridge 7. Here, as shown in FIGS. 2 and 6 to 8, a plurality of axial ribs 80a integrally protruding from the outer peripheral surface of the rear cylindrical portion 80 are provided on the inner periphery of the large diameter hole 7a at the tip. It is press-fitted to the surface. Furthermore, an outer circular stepped portion 81 having a large diameter step shape is integrally formed at the tip of the rear cylindrical portion 80 . This outer circular step portion 81 is brought into contact with the tip of the lead cartridge 7 . At the front end of the outer circular stepped portion 81, a front cylindrical portion 82 having a small-diameter stepped shape is coaxially and integrally connected. As shown in FIGS. 2, 3, 6, and 9, the front cylindrical portion 82 has an elastic opening/closing section that is divided into two parts in the diametrical direction by an axial slit 83 extending from approximately the middle part to the front end. The piece 8, 1.85 is integrally formed. These elastic opening/closing pieces 8, 185 have an inward elastic force and can be expanded and contracted in the diametrical direction, and have a symmetrical opening and closing piece divided into two by the slit 83 at their distal end axis center. Half-circular arc-shaped half-core thickness through holes 86 and 87 are provided. The half core thickness through holes 86, 87 are formed by the elastic opening/closing piece portions 84.8.
When the elastic opening/closing piece portions 84 and 85 are elastically deformed in the direction of diameter expansion, conduction is possible between the cores 4 having different core diameters, and when the elastic opening/closing piece portions 84 and 85 are elastically deformed in the diameter direction, conduction is not possible with the core 4 of the smallest diameter. It is formed with an inner diameter. In the natural state, the elastic opening/closing piece portions 84 and 85 each have a half-core thickness through-hole 86 due to an inward elastic force.
, 87 are closed to each other in a reduced diameter state to have the minimum diameter. In other words, (1) When used only for leads 4 of the same core diameter, the half-core thickness through holes 86 and 87 have elastic opening/closing pieces 84 and 85, and outwardly engaging pieces 88 and 89, which will be described later, are connected to the chuck of the lead guide 6. When press-fitted into the storage hole 62, for example, 0.5 mm, 0.5 mm, etc.
It is formed to have an opening large enough to conduct only one type of core 4, such as a 7-meter diameter or a 0.9-meter diameter core. ■Next, when using the cores 4 of different diameters (for example, 0.5 fin and 0°7 crane cores), the half core thickness through holes 86 and 87 are connected to the chuck storage hole 62. When the outward engaging pieces 88 and 89 are press-fitted, any of the cores 4 can be deformed to an opening that allows conduction, and when the press-fit engagement is released, any of the cores 4 can be deformed to an opening that does not allow 4 passages. is formed. At the front ends of such half core thickness through holes 86, 87, as shown in FIGS. 2, 3 and 9, there are half front tapered holes 86a whose diameters gradually increase on the front end sides thereof, 87a is formed. Further, at the rear ends of the half core thickness through holes 86 and 87, there is a half rear tapered hole 86b whose diameter gradually increases on the rear end side of each other.
, 87b are formed. Further, outward engaging pieces 88, 89 extending in opposite directions are integrally formed on the distal end sides of the elastic opening/closing pieces 83, 84, respectively. More specifically, on the distal end side of the elastic opening/closing piece 84° 85, the slit 83 is halved, avoiding each of the outward engaging pieces 88° 89, as shown in FIGS. 4 and 5. The core thickness through holes 86 and 87 are divided. The distal ends of the elastic opening/closing pieces 84, 85 are stepped slins (83a) connected to both ends of the slit 83 along the inner surfaces of the outward engaging pieces 88, 89;
83b is provided. Therefore, the portion where the outward engaging piece 88.89 is formed on the distal end side of the elastic opening/closing piece 84.85 is formed by the slit 83.
It is divided into different steps by each of 83a and 83b. As a result, the outward engaging piece 8 of one elastic opening/closing piece 84
8 protrudes outward from the outer circumferential surface of the other elastic opening/closing piece 85, and on the opposite side, the outwardly engaging piece 89 of the other elastic opening/closing piece 85 protrudes from the outer circumferential surface of one elastic opening/closing piece 84. protrudes outward. Here, as shown in FIGS. 2 and 5, the outward engaging pieces 88 and 89 have a length a) from their respective axial centers.
, (b) is formed longer than the radius (C) of the chuck storage hole 62. As shown in FIGS. 2, 3, and 6, the front portion of each outward engaging piece 88, 89 has a forward arcuate surface asa, 89.
These forward arcuate surfaces 88a and 89a allow the outward engaging pieces 88 and 89 to be easily press-fitted into the chuck housing hole 62 of the lead cartridge 7. That is, the elastic opening/closing piece portions 84 and 85 are as shown in FIG. As shown in FIG. 4, FIG. 6, and FIG. 7, the half-core through holes 86, 87 are elastically deformed in the diametrical direction by their respective internal elastic forces.
In the mutually closed natural state, each of the outward engaging pieces 88 and 89 is press-fitted into the chuck housing hole 62 through the rear fitting hole 63 of the lead guide 6. By this press-fitting, each of the outwardly engaging pieces 88, 89 moves in the direction of passing each other, as shown in FIGS. When the portions 84 and 85 are elastically deformed in the diametrically expanding direction, the half core warming holes 86 and 87 are opened. Here, the outward engaging pieces 88 and 89 are resiliently engaged in the chuck housing hole 62 of the lead guide 6, and the lead cartridge 7 is thereby inserted into the lead guide 6 via the opening/closing mechanism 8 and set. has been done. Further, on the outer circumferential surface of the elastic opening/closing piece portion 84.
As shown in FIGS. 7 and 9, gouged portions 84a and 85a each having a semicircular arc cross section are provided spanning both sides. These gouges 84a and 85a allow the elastic opening/closing piece 84
．． 85 is formed to be thin in the diameter direction and easily deform elastically, and when the lead guide 6 is smoothly engaged with and released from the chuck storage hole 62 and the lead TJ1 is recognized, the lead guide 6 is Opening/closing mechanism 8 for the fitted lead cartridge 7
Take it out both times. At this time, the outward engaging pieces 88 and 89 of the opening/closing mechanism 8 are released from the elastic engagement with the chuck storage hole 62.
The core 4 is closed to a diameter where conduction is impossible so that each of the elastic opening/closing pieces 84 and 85 becomes one or less. For this reason, when the lead cartridge 7 is removed, the lead 4 inside the lead cartridge 7 comes out of the opening at its tip and the outer cylinder 11.
There is no risk of it remaining inside or spilling out of the outer cylinder. Furthermore, since there is no risk of residual windows 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, so the flow of resin due to the thin inner surface of the tip during molding of the lead cartridge 7 is insufficient. There are no problems with the design. Furthermore, unlike in the past, it is no longer necessary to provide an inner step 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 be increased. This allows for a dramatic increase in core storage capacity. Furthermore, if the lead 4 remains across the lead feed hole 61 of the lead guide 6 and the half-core warming holes 86 and 87 of the opening/closing mechanism 8, the remaining core 4 can be removed by removing the opening/closing mechanism 8. When the elastic opening/closing pieces 84 and 85 are elastically deformed in the diametrical direction due to the resilient disengagement of the outwardly directed engaging pieces 88 and 89,
It is chucked by the elastic opening/closing piece parts 84 and 85 and pulled out. Therefore, after removing the lead cartridge 7, if the lead 4 is pulled out from the half-core heating holes 86, 87 or pushed into the lead cartridge 7, then when replacing the lead cartridge 7, the above The remaining core 4 may break or
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 outward engaging pieces 88 and 89 of the opening/closing mechanism 8 are press-fitted into the rear cylindrical part 61 of the lead guide 6 and are snap-fitted.
As a result, the half-wick warming holes 86 and 87 of the opening/closing mechanism 8 are opened as described above, and the supply of the wick 4 becomes possible. When replacing the lead cartridge 7 in this manner, the half-core warming holes 86 and 87 are closed until the outwardly engaging pieces 88 and 89 are inserted into the chuck housing hole 62.
There is no risk of the lead 4 in the lead cartridge 7 jumping out unlike in the conventional case. In addition, there is no need to hold the mechanical pencil upside down and keep the lead cartridge 7 facing upward while replacing the lead cartridge, making it extremely easy and convenient to replace the lead cartridge 7 regardless of the orientation of the mechanical pencil. I can do it. In particular, the opening/closing mechanism 8 has a plurality of elastic opening/closing pieces 84.8.
5 each have an outward engaging piece 88, 89, and can open and close in the radial direction via these outward engaging pieces 8-8, 89. A new lead cartridge 7 containing a different lead 4 can be attached to the lead guide 6 in a double manner so that the new lead 4 can be supplied. That is, the degree of opening and closing of the opening/closing mechanism 8 is adjusted by the opening/closing operation of the elastic opening/closing pieces 84 and 85 via the outward engaging pieces 88 and 89. It can also be used as the core 4 of the diameter. 10 to 20 show an opening/closing mechanism 8 according to a second embodiment. The opening/closing mechanism 8 of this second embodiment has a structure in which the entire opening/closing mechanism 8 is divided into two parts in the diametrical direction along the axis. That is, the rear cylindrical portion 80 is composed of half cylindrical portions 801 and 802 that are diametrically divided into two along its axis. These half cylindrical parts 801, 802 are press-fitted into the large diameter hole 7a at the tip of the lead cartridge 7 shown in FIGS. 1 to 3.
They are assembled together concentrically, and at the time of assembly, they are securely engaged and fixed to each other. As a means of securing it, Fig. 10, Fig. 12, Fig. 13,
As shown in FIG.
However, an engagement recess 805 corresponding to the engagement projection 803 and a locking projection 806 corresponding to the engagement recess 804 are integrally formed on the other side. Therefore, the engagement convex portion 803 and the engagement recess 804 of one half-cylindrical portion 801 are connected to the engagement concave portion 804 of the other half-cylindrical portion 802.
05 and the engagement convex portion 806, the two half-cylindrical portions 801 and 802 are correctly combined and combined without being misaligned in the axial direction. Therefore, the opening/closing mechanism 8 The assembly and attachment to the lead cartridge 7 can be easily performed by the operator. Furthermore, a plurality of engagement ribs 803a and 806a are integrally formed on the outer circumferential surface of each of the engagement projections 803 and 806, as shown in FIGS. 13, 15, and 16. These engaging ribs 803a and 806a are arranged so that when the engaging convex portions 803 and 806 are fitted into and engaged with the engaging concave portions 804 and 805, the engaging convex portions 803 and 806 are engaged with each other.
is press-fitted to the inner circumferential surface of the Therefore, the engaging protrusions 803, 806 do not come out of the engaging recesses 804, 805, and the half cylindrical parts 801, 802 can be integrally connected even more firmly when combined. The assembly accuracy of the opening/closing mechanism 8 has been further improved, and the attachment to the core cartridge 7 can be performed easily and reliably.
．． 85 can be opened and closed smoothly and reliably. At the tips of the half-cylindrical parts 801 and 802, there is an outer semicircular step part 81A having a large-diameter step shape and integrally divided into two parts.
, 81B, the elastic opening/closing pieces 84 and 85 are integrally connected to each other. As shown in FIG. 13 showing one of these elastic opening/closing pieces 84 and 85, the elastic opening/closing pieces 84 and 85 are desirably deformed (
(elastic deformation). Therefore, when the elastic opening/closing pieces 84, 85 are combined, the elastic opening/closing pieces 84, 85 can be combined together without any gaps by strongly press-contacting them. Therefore, as shown in FIGS. 10 and 11, an outward engaging piece 88.89 is integrally formed on the distal end side of the elastic opening/closing piece 84.85 and extends to the opposite side in the diametrical direction. 1
As shown in Figures to 3, when press-fitting into the lead guide 6,
Those outward engaging pieces 88,89 move in the relative direction (diametrically inward), and the elastic opening/closing pieces 84,85 move diametrically outward together with the outward engaging pieces 88,89. As a result, the half-wick warming holes 86 and 87 are opened. In this state, when the outward engaging piece portions 88 and 89 are removed from the lead guide 6, the elastic opening/closing piece portion 84
．． 85 elastically restores itself diametrically inward, thereby closing the halved core warming holes 86, 87. In this way, by press-fitting the outward engaging piece portions 88.89 into the lead guide 6 and pulling them out from the lead guide 6, the elastic opening/closing piece portions 84.85 are inserted into the half core warming holes as, s7. The opening and closing operations are performed, but as mentioned above,
By dividing the entire opening/closing mechanism 8 into two, the opening/closing operation radius of the elastic opening/closing pieces 84.85 becomes larger, and these elastic opening/closing pieces 84.85 become easier to elastically deform. Moreover, as described above, each of the elastic opening/closing pieces 84, 85 is plastically deformed inward in the radial direction and has sufficient elastic restoring force. degree decreases. In addition, by dividing the entire opening/closing mechanism 8 into two,
The outward engaging piece portion 88.89 and the portion where the half core warming holes 86, 87 are formed on the distal end side of the elastic opening/closing piece portion 84.85 are divided and formed in a right angle direction with different steps as shown in Fig. 11. be able to. Therefore, the half opening/closing mechanism 8 can be easily formed, and the elastic opening/closing pieces 84 and 85 have sufficient restoring force to
The mating surfaces of the half-core warming holes 86 and 87 can also be reliably joined without any gaps, and the elastic opening/closing piece portions 84 and 85
There is no risk that the core 4 inside the core cartridge 7 will come out and fall. 21 to 23 show a third embodiment. In this third embodiment, the engaging protrusion 803.80 in the third embodiment is
6 and the engaging recesses 804 and 805 are removed. Therefore, in the case of this second embodiment, the rear semi-cylindrical portion 801.
802 are concentrically assembled and press-fitted into the tip hole of the lead cartridge 7 for use. According to this third embodiment, the molding of the half-split opening/closing machine JR8 can be performed even more easily than in the case of the second embodiment, and, like the second embodiment, the elastic opening/closing piece portions 84, 85 can be formed more easily. Effects on opening and closing functions can be obtained. Incidentally, since the other configurations of the second and third embodiments are the same as those of the first embodiment, the same or equivalent parts are given the same reference numerals and the explanation thereof will be omitted.

【Effect of the invention】

As described above, according to the present invention, the chuck-type opening/closing mechanism, which is divided into a plurality of parts in the radial direction and has an inward elastic force and is provided on the lead cartridge, is provided with a chuck-type opening/closing mechanism that is divided into a plurality of parts in the radial direction and has an inward elastic force. This is achieved by providing an outwardly engaging piece portion that moves in the opposite direction to open the core warming hole, and when the press-fit engagement is released, elastically moves outward in the diametrical direction to close the core warming hole. Since the core heating hole opens when the outward engaging piece portion snaps into engagement with the lead guide and closes when it disengages, there is no risk of the lead popping out when replacing the lead cartridge, and When replacing the lead cartridge repository, the chuck-type opening/closing mechanism is closed so that the lead remaining in the writing instrument can be removed. Therefore, the lead cartridge can be replaced extremely 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 described above makes it possible to create a lead cartridge that shares not only leads of the same diameter but also leads of different diameters, eliminates waste parts such as the cap of conventional lead cartridges, and Since there is no need to provide a thick step wall, it is possible to extrude the writing instrument outer cylinder, and many excellent effects can be obtained, such as increasing the lead storage capacity of the lead cartridge lithium. A schematic perspective view of the mechanical pencil, FIG. 2 is a cross-sectional view of the lead cartridge attachment part of the mechanical pencil before assembly, FIG. 3 is a cross-sectional view after assembly, and FIG. 4 is the rV- of FIG. 2. 5 is a sectional view taken along line V-V in FIG. 3, FIG. 6 is a side view of the chuck-type opening/closing mechanism according to the first embodiment, and FIG. 7 is a sectional view taken along line ■-■ in FIG. 6. 8 is a sectional view taken along the line ■-■ in FIG. 6, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 6, and FIG. Partially sectioned side view with
Figure 1 is a left end view of Figure 1O, Figure 12 is A of Figure 10.
13 is a side view showing one of the chuck type opening/closing mechanisms in FIG. 10, FIG. 14 is a sectional view taken along line B-B in FIG. 13, and FIG. C-line sectional view, 16th
The figure is a sectional view taken along the line G-C in FIG. 15, FIG. 17 is a view taken along the line D-D in FIG. 13, FIG. 18 is a left end view of FIG. 17, and FIG. -B sectional view, Figure 20 is the 13th
21 is a side view of the chuck-type opening/closing mechanism according to the third embodiment in a combined state; FIG. 22 is a sectional view taken along line H-H in FIG. Figure 23 is the 21st
24 is a perspective view of a conventional lead cartridge, and FIG. 25 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 88° 89 outward engaging pieces. Procedural amendment (voluntary)

Claims (3)

[Claims] (1), the lead is removably fitted into the mechanical pencil (
A lead cartridge (7) for replenishing and replacing the lead cartridge (4), and a chuck-type opening/closing mechanism (8) that is divided in the radial direction and has an inward elastic force and is provided on the lead cartridge (7).
The chuck-type opening/closing mechanism (8) is provided with a mechanism that moves diametrically inward against the inward elastic force when press-fitted into the lead guide (6) to open the core conduction holes (86) and (87). outwardly engaging pieces (88) and (89) which are opened and elastically move outward in the diametrical direction to close the core conduction holes (86) and (87) when the press-fit engagement is released; Equipped with a core cartridge opening/closing device. (2) The opening/closing mechanism (8) has elastic opening/closing pieces (84) and (85) that are divided in the right angle direction along the axis and combined on the same axis. 2. The lead cartridge opening/closing device according to claim 1, wherein the elastic opening/closing pieces 84, 85 are elastically deformed in relative directions. (3) The dividing surface of the opening/closing mechanism (8) has engaging protrusions (803), (806) and engaging recesses (804) that fit and engage each other when the opening/closing mechanism (8) is combined. ), (8
05). The lead cartridge opening/closing device according to claim 1 or 2, characterized in that the lead cartridge opening/closing device is provided with: 05).