JPS6325183Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention consists of a main body consisting of a front part and a rear part; The present invention relates to a fine lead sharpening pencil equipped with an ejector mechanism configured as follows.

[Conventional technology]

Conventional sharpening pencils (e.g. 1980-
No. 152732) is a sharp pencil main body (hereinafter referred to as the "main body") that includes a forward/backward mechanism equipped with a notch cap, and a rotor associated with this forward/backward mechanism that is exposed at its tail and inserted into the main body. It consists of a cartridge main body (hereinafter referred to as "cartridge") built into the main body, and a spring that biases the cartridge so that it stays in the main body at all times.The cartridge has a slider ( The cartridge has a structure in which writing is possible when the cartridge is advanced from the main body.

[Problem that the invention attempts to solve]

In the conventional sharp pencil described above, when the cartridge, which is always biased by a spring so as to be housed inside the main body, is moved forward and backward inside the main body by an advance/retreat mechanism equipped with a locking cap,
Since the cartridge is moved forward and backward via a rotor provided in the main body, other structural members such as springs for clamping springs and pushers are required in addition to the above-mentioned springs and rotor, resulting in a complex structure. It is difficult to assemble by simply inserting each component into the main body, and the assembly process is time-consuming.
The problem was that the production cost was high.

Further, in the above configuration, there was a problem in that the cartridge rattled within the main body.

This invention was made to solve these problems, and the ejector mechanism can be assembled using minimally simple parts, and it is a sharp pencil that can be easily and quickly inserted into the main body, and can be manufactured at low cost. The purpose is to provide

[Means for solving problems]

The sharp pencil for fine lead according to this invention includes a main body consisting of a front part and a rear part; an ejector mechanism inserted into the main body and configured to be able to eject the lead in the sharp pencil itself; A sharp pencil for fine lead, wherein the ejector mechanism includes a distal end of the mechanism including a lead guide tube and a lead brake, a guide sleeve with a collet and a sleeve inside, a spring, a lead supply pipe, and an actuator. The tip of the mechanism and the guide sleeve, and the core supply tube and the push-in part for operation are connected to each other by push-fitting; The mechanism tip, the guide sleeve, and the core supply tube are made of elastic plastic. In a fine-lead sharpening pencil, the mechanism tip and the guide sleeve include a radial enlarged portion provided on either the mechanism tip or the guide sleeve, and a radial enlarged portion provided on the other of them. said ejector mechanism; said ejector mechanism; said ejector mechanism; said ejector mechanism; said ejector mechanism; The device does not slip out of the front part of the main body by means of positioning means consisting of a radial pedestal part provided at the tip of the mechanism constituting the mechanism and facing forward, and a radial pedestal part provided inside the front part of the main body and facing rearward. a radial platform provided on either the outside of the guide sleeve constituting the ejector mechanism or the inside of the front part of the main body; a cylindrical portion provided at the front end of the rear portion of the body is connected to the guide sleeve by a second coupling means comprising a radial platform and a mating opposing protrusion; fixed to the front part of the main body; a ring-shaped protrusion that narrows the hole as a rear stopper of the core guide tube is provided at the distal end of the mechanism; The above-mentioned problem has been solved by providing an elastic protruding piece on the part and closely fitting the rear end of the core supply pipe through the elastic protruding piece.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

In the case of the embodiment shown in FIG. 1, a collet 10, a sleeve 12, a core supply pipe 14, and a spring 16 constitute the movable mechanism part of the ejector mechanism.
As shown in the figure, is arranged in a substantially hollow cylindrical guide sleeve 18 with an extremely simple structure,
Moreover, these parts are introduced with certain limited radius tolerances. As a result, there is less risk of lead breakage, which can cause deterioration in the quality of sharp pencils.

The collet 10 has a sawtooth cross section at its rear end 20, which in the embodiment shown in the lower half of FIG. is inserted into the hole 22 of. In this way, since the delicate collet 10 is simply inserted and connected to the core supply tube 14, the core supply tube 14 can be manufactured from a very inexpensive synthetic resin tube or the like.

On the other hand, in one embodiment shown in the upper half of FIG. In this case, the coupling sleeve 24 is preferably also made of synthetic resin. In this embodiment, it is permanently inserted into the front end of the core supply tube 26, which is thin and has a large inner diameter. By using the coupling sleeve 24 as described above, even when using core supply tubes 26 whose radial dimensions differ within a considerable range, by using the corresponding coupling sleeve 24, it is possible to maintain a constant shape at all times. Collection can be used. Furthermore, the connection method between the collet 10 and the core supply pipe 26 can be maintained by simple insertion and connection as described above.

The guide sleeve 18 is preferably manufactured using a synthetic resin injection machine, but since there is no need to provide a screw for fixing the tip of the mechanism or a screw for fixing the guide sleeve 18 itself into the main body, the guide sleeve 18 can be manufactured using a synthetic resin injection machine. 18 does not require particularly strict manufacturing tolerances and can be manufactured extremely easily and at low cost.

The front portion 28 of the guide sleeve 18 is provided with a radial enlarged portion 30 .
is snap-fitted into a corresponding groove 32 provided in the mechanism tip 34, which is also preferably made of synthetic resin. That is, the mechanism tip 34 and the guide sleeve 18
The first coupling means connects the radial enlarged portion 30 provided on one of the mechanism tip 34 and the guide sleeve 18, for example, the guide sleeve 18 in this case, and the other of these, for example, the mechanism in this case. The distal end portion 34 is provided with a radial enlarged portion 3.
0 and a corresponding groove 32 that fits therein. Due to the above-described connection, the mechanism tip 34 is easily and securely attached to the front part 28 of the guide sleeve 18.
Moreover, it can be easily pulled out by pulling.

A core guide tube 36 is arranged in the bore 40 of the mechanism tip 34, which is axially movable and is provided with a core brake 38 of known construction type. The hole 40 that guides the core guide tube 36 has this hole 4
A ring-shaped projection 42 narrowing at 0 is provided and serves as a stop for the retracted position of the core guide tube 36. By forming the mechanism tip 34 from an elastic material, especially synthetic resin, during assembly,
By pushing the core guide tube 36 from the rear direction of the main body, it passes through the ring-shaped protrusion 42,
It can be embedded in the hole 40. Thereafter, the ring-shaped protrusion 42 returns to its original shape due to its own elasticity. Therefore, when the sharp pencil is disassembled and the distal end of the mechanism is removed from the guide sleeve, the lead guide tube 36 may be unexpectedly pushed out from the ring-shaped protrusion 42 or fall when turned downward. There's nothing left to do.

In addition, in order for the ring-shaped protrusion 42 to always exhibit its effect when using the sharpening pencil,
Core guide tube 36 enabled by ring-shaped protrusion
The axial movement path A is larger than the distance B between the core guide tubes 36 extending from the mechanism tip 34. Thereby, even if an inappropriate force is applied to the tip of the core guide tube 36, the core guide tube 36 will not be pushed beyond the ring-shaped protrusion 42. In this way, the core guide tube 36 is connected to the mechanism tip 3.
4 and can be securely fixed, the manufacturing cost of the sharpening pencil can be significantly reduced without degrading the quality.

The ejector mechanism configured as described above has a structural unit inside that can independently eject the lead, so it has a complete function as a sharp pencil even before it is incorporated into the main body.
Therefore, the functionality of the ejector mechanism can be tested before it is incorporated into the main body, which is also a factor in lowering manufacturing costs.

In the upper part of Fig. 1, the ejector mechanism is located at the front part 4 of the main body.
4 shows how it is securely fixed by insertion coupling. In the illustrated embodiment, the front body portion 44 has a radial pedestal 46 which is connected to the guide sleeve 18.
It is adapted to come into contact with the opposing protrusion 48 by means of an elastic snap. That is, the second coupling means for coupling the guide sleeve 18 to which the mechanism tip 34 is coupled and the main body front part 44 is either the outside of the guide sleeve 18 or the inside of the main body front part 44, for example, in this case. A radial pedestal 46 provided on the inside of the front part 44 of the main body, and an opposing protrusion 4 provided on the other side, for example, on the outside of the guide sleeve 18 in this case, and which fits into the radial pedestal 46.
It consists of 8. Thereby, the ejector mechanism can be easily inserted into the main body front portion 44, and there is almost no displacement after insertion.

Next, a radial platform 50 facing forward is provided on the mechanism tip 34 and is configured to come into contact with a radial platform 52 provided at the front portion 44 of the main body and facing rearward. That is, the positioning means for positioning the mechanism distal end 34 so that it does not slip out from the front of the main body 44 includes a radial pedestal 50 provided on the mechanism distal end 34 and a radial pedestal 50 provided on the main body front 44. It consists of a radial platform portion 52 that abuts.

At the same time, although not shown in FIG.
Body rear portion 56 in the manner shown in the figures.
By bringing the forward facing cylindrical portion 54 provided on the guide sleeve 18 into contact with the rear edge 58 of the guide sleeve 18, the ejector mechanism can be securely fixed to the main body front part 44 and the main body rear part 56, and furthermore,
No special parts or work are required to incorporate the ejector mechanism into the main body. It should be noted that the front body portion 44 and the rear body portion 56 may be coupled in any known manner, such as by a simple insertion coupling (not shown) or by screws 60 as shown in FIG.

In this way, the ejector mechanism can be easily fixed to the main body, so assembly costs are significantly reduced. In particular, since the main body itself does not affect the function of the ejector mechanism, the dimensions of the main body do not require high accuracy. Furthermore, since the ejector mechanism is easily accessible, it is very easy for the user to remove lead residue if it occurs, making it easier for the user to operate the sharpening pencil.

Furthermore, FIGS. 2 and 3 show the end of the rear portion of the sharpening pencil, which is omitted from FIG. 1. From this illustrated part, it can be seen that an elastic projecting piece 66 is provided inside the hollow cylindrical front part 64 of the operating push-in part 62, which is also made of synthetic resin and controls the operation of the sharp pencil. In this case, the actuating push-in portion 62 is disposed closely to the rear end portion 68 of the core supply pipe 14 by the elastic protruding piece 66 . That is, in this case as well, assembly is performed by simple insertion and coupling, thereby closing the rear end 68 of the lead supply tube 14 and making it possible to operate it as a sharp pencil.

The actuation push-in part 62 is further provided with an eraser 70 and a cleaning needle 72 for the lead guide tube 36 that becomes free when the actuation push-in part 62 is pulled out from the lead supply pipe 14.

When the operating push-in part 62 is pulled out,
The inner diameter of the elastic protruding piece 66 is somewhat smaller than the outer diameter of the core supply tube 14. Therefore, when the actuating push-in part 62 is press-inserted into the rear end 68 of the core supply pipe 14, even if there is a slight difference in the outer diameter of the core supply pipe 14, the actuation push-in part 62 will fit into the core supply pipe 14. Since the core supply pipe 14 is arranged in close contact with the core supply pipe 14, even if the core supply pipe 14 has a fairly large tolerance, it will not cause problems. This results in
The manufacture of the core supply tube 14 is likewise inexpensive.

Although FIG. 4 is shown for reference and is not an embodiment of the present invention, it is an enlarged view of another form of the mechanism tip 34'. In this embodiment, the core guide tube 36' is simply a short cylindrical section, the rear end 76 of which is connected to the hole 74.
is pushed into the corresponding hole 74 of the mechanism tip 34' so as to contact the radial platform 78 of the mechanism tip 34'.
This ensures that the core guide tube 36' is fixed, in this case immovably, to the mechanism tip 34'. In this case, too, there is no need to adhere to precise fit tolerances, which would increase manufacturing costs, since the connection is simply inserted. In addition, the core guide tube 3
If 6' is fixed in this manner, there will be no axial movement, which would be a problem if the mechanism tip 34' were made of synthetic resin, even if undue stress were to occur.

Also, as shown in the upper part of Fig. 4,
The required core brake can be inserted into the mechanism tip 34' as a special structure 38'. In a particularly inexpensive and simple variant, as shown in the lower part of FIG. Assembly becomes cheaper.

[Effect of idea]

As explained above, this invention, among the components of the ejector mechanism that is inserted into the main body and configured to be able to eject the lead of a sharp pencil by itself, uses the tip of the mechanism as a guide sleeve. , in the radial direction, by the first coupling means consisting of a radial bulge provided on either the mechanism tip or the guide sleeve, and a corresponding groove provided on the other of these and fitted with the radial bulge. an ejector mechanism; a radial pedestal portion facing forward and provided at the distal end of the mechanism constituting the ejector mechanism; and the main body. A positioning means consisting of a radial platform provided inside the front part of the body and facing rearward positions the body at the front part of the body so as not to slip out from the front part of the body; and the outside of the guide sleeve forming the ejector mechanism. Further, by a second coupling means consisting of a radial pedestal provided on either one of the inner sides of the front part of the main body, and an opposing protrusion provided on the other side of the radial pedestal and fitted with the radial pedestal, connected to the front part of the main body; further, by abutting a cylindrical part provided at the front end of the rear part of the main body with the rear edge of the guide sleeve; fixed to the front part of the main body; A ring-shaped protrusion is provided as a rear stopper of the core guide tube to narrow the hole at the tip of the mechanism; an elastic protrusion is provided on the operating push-in part, and the rear end of the core supply tube is connected to the rear end of the core supply tube via the elastic protrusion. Due to the close fit; When assembling the sharp pencil, the tip of the mechanism and the guide sleeve are fitted together; the tip of the mechanism is positioned at the front of the main body; and the guide connected to the tip of the mechanism The sleeve is connected to the main body in a fitted state so that it does not fall out; the operating push-in part is fitted into the core supply pipe; all can be assembled by fitting in the axial direction, and the entire It can be assembled easily and quickly, and it can also be disassembled easily, making it easy to replace parts.
Moreover, these parts can be manufactured at a lower cost than connections using screws or the like. As a result, the manufacturing cost of sharp pencils can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a part of the first embodiment of the sharpening pencil according to the present invention, in which case the upper half of the figure shows a modification of the lower half, and FIG. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a side view of the entire mechanical pencil shown in cross section, and FIG. 4 is a side view of the tip of the mechanism shown for reference. It is a side sectional view showing a part, and the upper half and the lower half each show a different form. Explanation of symbols of main parts, 10...Collection, 1
2...Sleeve, 14...Core supply tube, 16...Spring, 18...Guide sleeve, 30...Radial ampulla, 32...Corresponding groove, 34...Mechanism tip, 36...Core guide tube, 40...hole, 42...
...Ring-shaped protrusion, 44...Front part of main body, 46...
... Radial platform, 48... Opposing protrusion, 50... Radial platform, 52... Radial platform, 54... Cylindrical portion, 56... Rear part of main body, 58... Rear edge of guide sleeve, 60...screw, 62...operating push-in part, 64...hollow cylindrical front portion, 66...elastic protruding piece, 68...rear end of core supply pipe.

Claims (1)

[Claims for Utility Model Registration] A main body consisting of a front part and a rear part; and an ejector mechanism inserted into the main body and configured to be capable of ejecting the lead of a sharp pencil by itself. A sharpening pencil for fine lead; the ejector mechanism includes a mechanism distal end portion having a lead guide tube and a lead brake part in the hole, and a guide sleeve including a collet and a sleeve inside;
A spring, a core supply pipe, and an actuating push-in part; The mechanism tip and the guide sleeve are connected to each other by push-fitting, and the core supply pipe and the actuation push-in part are connected to each other by push-fitting; the mechanism tip, the guide sleeve, and the core. The supply tube is made of elastic plastic; in a fine-lead sharpening pencil; the mechanism tip and the guide sleeve are connected to a radial bulge provided on either the mechanism tip or the guide sleeve; The first coupling means is provided on the other side of the radial enlarged portion and includes a corresponding groove that fits into the radial enlarged portion. and a positioning means for the ejector mechanism, which includes a radial pedestal part provided at the distal end of the ejector mechanism and facing forward, and a radial pedestal part provided inside the front part of the main body and facing rearward. a radial stand provided on either the outside of the guide sleeve constituting the ejector mechanism or the inside of the front part of the main body; and an opposing protrusion provided on the other of these parts and fitting with the radial platform part; The provided cylindrical part,
fixed to the front part of the main body by abutting against the rear edge of the guide sleeve; providing the mechanism tip with a ring-shaped protrusion that narrows the hole as a rear stopper of the core guide tube; 1. A sharpening pencil for fine lead, characterized in that an elastic protruding piece is provided on the actuating push-in part, and the rear end of the lead supply tube is closely fitted through the elastic protruding piece.