JP2001058492A - Side knock type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively house a lead without holding a mechanical pencil in an another way by disposing a lead returning mechanism for retracting the lead in the forward part of a barrel in the pencil for feeding the lead by a pressably knocking dowel disposed at an intermediate part of the barrel. SOLUTION: When a barrel 1 is grasped in a grasping state in the case of writing, inclined at an angle of about 60 degrees in the case of writing and a knocking dowel 3 is lightly pressed, a chuck 9 grasping a lead L together with a slide member 5 is advanced together with a chuck ring 10. When the ring 10 is advanced in a certain degree, the ring 10 is brought into contact with a ring member 17 to stop moving of the ring 10. Here, when the dowel 3 is further pressed, only the member 5 and the chuck 9 are advanced, the chuck 9 is enlarged, and grasping of the lead is released. Since the lead L is frictionally engaged with a lead return stop member 15 by a light force, a slider 14 is advanced in association with the advancing of the lead L, and a lead protective tube 16 is projected from a front member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-knock mechanical pencil in which a pushable knock piece is arranged at an intermediate portion of a barrel, and a lead is fed out by pushing the knock piece.

[0002]

2. Description of the Related Art As an example, Japanese Utility Model Laid-Open Publication No. Hei 4-7188 will be described. The idea is, `` It is possible to advance independently with respect to the knock cylinder or the knock cylinder connected with the knock cylinder, etc. When the knock cylinder etc. is advanced, it is assembled in a separated state so that it can advance integrally, and the side knock button is urged to the inner edge of the window hole of the shaft cylinder with the side knock button mounted so that it can be retracted And a spring that pushes it. " That is, the core can be extended by the side knock method or the rear end knock method.

[0003]

In the above-mentioned prior art, not only the feeding of the lead but also the storing of the lead after use can be performed by either the side knock method or the rear end knock method. However, when the lead is stored by the rear end knocking method, it is necessary to change the mechanical pencil, press the knock piece, and press the lead against the paper to store the lead. When the lead is stored by the side knock method, the side knock piece is pressed and stored while the mechanical pencil is standing as in the rear end knock method while holding the grip, or the writing body is (Generally, the angle W with respect to the paper surface is about 60 degrees: see FIG. 11), and the side knock piece is pressed to store the core against the paper surface. However, in the former case, the core is stored in an unnatural manner, so there is a sense of discomfort. In the latter, the angle between the paper surface pressing the core and the core is an acute angle (about 60 degrees, which is the same as the writing angle). In addition, since the side knock piece is pressed from the side of the barrel, the pressing force of the knock piece acts on the slanted core, and as a result, the exposed core is not stored and is broken. There was a danger of doing it.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a knocking piece which can be pushed at an intermediate portion of a shaft cylinder, and a side for feeding out a lead by pushing the knocking piece. The gist of the present invention is a knock mechanical pencil, in which a centering mechanism for retracting a center is disposed at a front portion of the barrel.

[0005]

The core is stored by pressing the knock piece without pressing the core against the paper surface while maintaining the gripping state when writing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the present invention will be described with reference to FIGS. An inner surface of the barrel 1 has a substantially hexagonal shape, and a window hole 2 is formed in an intermediate portion thereof. In the window 2,
The knock piece 3 is arranged so as to be movable in the radial direction of the barrel 1. The knock piece 3 is formed with an engagement portion 4 having an inclined surface, and engages with an engagement receiving portion 6 of a sliding member 5 disposed in the shaft cylinder 1 so as to be movable back and forth. ing. At the rear of the sliding member 5, a core receiving member 7 for separating the core one by one is attached as a separate member, but it may be integrally formed with the sliding member 5. Also, the core receiving member 7
Has a substantially hexagonal shape similar to the inner surface shape of the barrel 1, and slides inside the barrel 1. That is, the inside of the shaft cylinder 1 located behind the core receiving member 7 is the core tank portion 8 that stores a plurality of cores.

On the other hand, a chuck body 9 for holding and releasing the core L is fixed to the tip of the sliding member 5, and a chuck ring 10 for opening and closing the chuck body 9 is provided in front of the chuck body 9. Is surrounding. Reference numeral 11 denotes a repelling member such as a coil spring that urges the slider 5, the chuck body 9, and the like backward.

Here, a front member 1 is provided at the front end of the barrel 1.
2 is detachably fixed by means such as screwing. Inside the tip member 12, a return ring 13 for closing the chuck body 9 again when the chuck body 9 is advanced most in the expanded state, and a slider that can protrude or sink from the tip of the tip member 12 14 are arranged. The return ring 13 is a centering mechanism of the present invention,
Although the return ring 13 of this example is an annular ring,
A resilient member such as a C-shaped ring or a coil spring partially cut away may be used. The slider 14
Are a core detent member 15 for providing frictional resistance to the movement of the core, and a core protection tube 1
6 and the like. The return ring 13
A ring member 17 is press-fitted and fixed behind the slider 14 and behind the inner surface of the tip member 12.
It may be formed integrally with the second member. However, in the case of integral molding, it is preferable to form not a ring shape but a partial projection shape. Slider 14 and centering ring 13
This is because, when assembling to the tip member 12, the projection is elastically deformed and inserted.

A thin cylindrical portion 18 is formed behind the slider 14, and an elastically deformable raised portion 19 is formed at an intermediate portion of the cylindrical portion 18. A groove 20 is formed on the outer peripheral surface of the return ring 13 to be engaged with the raised portion 19 of the slider 14. However, this is not always necessary, and the slider 14 and the return ring 13 are simply engaged by friction. May be combined. The knock piece 3 of the present embodiment can be pressed in the radial direction perpendicular to the barrel 1. However, as shown in the prior art, the knock piece 3 performs an arc-shaped operation. It may be possible to press in the radial direction.

Next, the operation will be described. From the state shown in FIG. 1, the barrel 1 is gripped in a gripping state when writing, and is tilted at an angle (about 60 degrees) when writing.
Is lightly pressed, the chuck body 9 holding the core L together with the sliding member 5 moves forward with the chuck ring 10. When the chuck body 9 moves forward to some extent, the chuck ring 10 comes into contact with the ring member 17 and the movement of the chuck ring 10 is prevented. Here, when the knock piece 3 is further pressed, only the sliding member 5 and the chuck body 9 advance, and the chuck body 9 expands and releases the gripping of the lead. The slider 14 moves forward with the advance movement of the lead L, and the lead protection tube 16 projects from the tip member 12. This is because the core L and the core detent member 15 are frictionally engaged with a light force. Here, when the pressing operation of the knock piece 3 is released, the chuck body 9 and the sliding member 5 retreat, and eventually the chuck body 9 is closed by the chuck ring 10, and the core L
Is gripped again. When the lead is worn out by writing, the knock piece 3 is pressed without changing the gripping state.
This is a general lead-out operation.

Next, when it is desired to store the lead (to reduce the amount of exposure of the lead) when the lead L is extended too long, the knock piece 3 is held without changing the gripping state or the angle of the barrel 1. Is pressed more than the above-mentioned operation (the operation of feeding the lead). Then, the core is also extended, but the chuck body 9
Abuts on the return ring 13, the return ring 13 abuts on the rear end of the raised portion 19 of the slider 14, and the forward movement of the return ring 13 is restricted. As a result, the chuck body 9
Fits into the return ring 13 and is closed and grips the core L again. In other words, the groove 20 of the return ring 13 is smaller than the force of the chuck body 9 fitted into the return ring 13.
9 is set to a larger force. here,
When the pressing operation of the knock piece 3 is released, the chuck body 9
When the return ring 13 comes into contact with the front end of the ring member 17, the return ring 13 is prevented from retreating, and is separated from the chuck body 9. 9 expands, but the chuck body 9
Is closed again by the chuck ring 10. As described above, in this example, the lead can be extended or stored by changing the amount of pressing of the knock piece 3.

In the present embodiment, by performing the above-described pressing operation, the core protection tube 1 of the slider 14 is moved.
6 can be stored in the tip member 12 by pressing the knock piece 3. The details will be described below. When the knock piece 3 is greatly pressed following the above operation, the groove 20 of the centering ring 13 engages with the raised portion 19 of the slider 14 through the lead-out operation and the above-described lead-holding operation (FIG. 6). Here, when the pressing operation of the knock piece 3 is released, the chuck body 9 retreats and the return ring 1
3 and the slider 14 also retreat, and are stored in the tip member 12. Of course, at this time, since the chuck body 9 is closed by the return ring 13, the core L is also retracted (see FIG. 7). That is, the engaging force between the return ring 13 and the slider 14 is
However, the fitting force between the return ring 13 and the chuck body 9 is set to be larger than the sliding friction force between the slider 14 and the inner surface of the tip member 12. When the core protection tube 16 of the slider 14 is stored, a large diameter portion 21 is formed at an intermediate portion of the tip member 12 so that the engagement between the return ring 13 and the slider 14 is easily released. Thus, the cylindrical portion 18 of the slider 14 is easily expanded. That is, the engagement between the return ring 13 and the slider 14 is easily released by facilitating the expansion of the cylindrical portion 18.

The above example is an example in which the slider 14 moves and the lead protection tube 16 can be housed in the tip member 12, but as shown in FIGS. The centering mechanism (such as the return ring 13) may be provided on a side knock type mechanical pencil fixed to the. In addition, an example in which the knock piece can be pressed in the radial direction of the barrel has been described. However, the knock piece 23 is moved in parallel with the axis of the barrel 22 so that the core is extended.
A so-called side-slide mechanical pencil may be provided with the centering mechanism (see FIG. 10). Even if the knock piece 23 is moved in parallel to the barrel 22,
Essentially, the pressing operation force on the knock piece 23 also acts in the direction of the paper (the direction perpendicular to the paper). Reference numeral 24 denotes an elongated hole formed in the shaft cylinder 22, and the knock piece 23 moves back and forth in the elongated hole 24.

[0014]

According to the present invention, there is provided a side-knock type mechanical pencil in which a pushable knock piece is arranged at an intermediate portion of a barrel, and a lead is fed out by a pressing operation of the knock piece.
Since the center return mechanism for retreating the lead is arranged at the front part of the barrel, the lead can be securely stored without changing the mechanical pencil.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an enlarged perspective view of a main part of FIG. 1;

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is an enlarged view of a main part showing a return operation of a lead.

FIG. 6 is an enlarged view of a main part showing a returning operation of the slider.

FIG. 7 is an enlarged view of a main part showing a returning operation of the slider.

FIG. 8 is a longitudinal sectional view showing a modification.

FIG. 9 is an enlarged view of a main part of FIG. 8;

FIG. 10 is a longitudinal sectional view showing a further modified example.

FIG. 11 is a perspective view showing a writing state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shaft cylinder 2 window hole 3 knock piece 4 engaging portion 5 sliding member 6 engaging receiving portion 7 core receiving member 8 core tank portion 9 chuck body 10 chuck ring 11 resilient member 12 tip member 13 return ring (center return mechanism) ) 14 Slider 15 Core detent member 16 Core protection tube 17 Projection 18 Cylindrical part 19 Raised part 20 Groove part 21 Large diameter part 22 Shaft cylinder 23 Knock piece L Core

Claims (2)

[Claims] 1. A side knock type mechanical pencil in which a pushable knock piece is disposed at an intermediate portion of a barrel, and a lead is fed out by a pushing operation of the knock piece, wherein the lead is retracted to a front portion of the barrel. Side knock mechanical pencil characterized by a return mechanism. 2. The side knock mechanical pencil according to claim 1, wherein the knock piece can be pressed radially against a shaft cylinder.