JPH09267596A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to allow an eraser to easily and safely protrude by forming the eraser of first and second erasing parts, differentiating the sectional shapes of the first and second erasing parts, and forming a holder of the same shape as that of at least one sectional shape at the rear of a barrel. SOLUTION: The mechanical pencil comprises an eraser 9 mounted at the rear end of a barrel 1 in such a manner that the eraser 9 is formed of first and second erasing parts 10, 11 and the sectional shapes of the parts 10, 11 are differentiated and a holder 6 formed of the same shape as at least one sectional shape at the rear end of the barrel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pencil having an eraser attached to the rear end of a shaft.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. 55-18223 discloses a sharp pencil having an eraser attached to the rear end of a shaft. And, in the utility model registration claim of the publication, "an eraser body is formed in a notch shape with a gap on one side made of a metal plate or other elastic plate material in an opening of a middle cylinder capable of storing a pencil lead. The hugging body is held and fitted, and a large number of protrusions or projections are formed on the upper end of the hugging body to form a hooking protrusion, and the hooking protrusion has an outer diameter of While being larger than the inner diameter of the cylinder and smaller than the outer diameter to be locked at the open end of the middle cylinder, the inside of the hooking protrusion is formed so that a part of the body of the eraser can be pressed into the eraser body and held. Also, the lower ends of both sides formed by bending the holding body are formed as circular notches, and a knock-combined cap having an inner diameter matching the outer diameter of the middle cylinder is detachably fitted in the middle cylinder. Eraser device for sharp pencils. "

[0003]

However, in the prior art as described above, when the eraser is exhausted, the holding body is first expanded from the gap, and then the eraser is moved so as to be pulled out. Then, the holding body must be bent again into the original shape, which is a very troublesome work. In particular, it is a troublesome work because the objects (holding body and eraser) are small. In addition, when a nail or the like is inserted into the gap between the holding members to open the nail, there is a risk that the nail may be damaged or, at a slight time, the nail may be peeled off. further,
A hug that holds the eraser is an essential part,
The product cost was increased.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a pencil having an eraser attached to the rear end of a shaft, wherein the eraser is used as a first erasing portion. And the second erasing section, and the first
The cross-sectional shapes of the erasing portion and the second erasing portion are different from each other, and at the same time, a holding portion having the same shape as at least one cross-sectional shape is formed at the rear end of the shaft.

[0005]

FIG. 1 shows a first example. Behind the intermediate portion of the barrel 1 is a lead tank 2 for accommodating a plurality of leads, but the barrel 1 and the lead tank 2 may be configured as separate members. An eraser receiving member 3 is press-fitted and fixed to the rear end of the lead tank 2 (shaft cylinder 1), and a clip 4 is formed on the outer side surface of the eraser receiving member 3, and It may be integrally formed. The eraser receiving member 3 is composed of a press-fitting portion 5 into the barrel 1 and a holding portion 6 for holding the eraser. Further, the holding portion 6 has a large-diameter holding hole 7 and a small-diameter holding hole 7. It is composed of a holding hole 8. An eraser 9 is detachably attached to the holding portion 6, and the eraser 9 has a large diameter portion 10
It comprises a (first erasing portion) and a small diameter portion 11 (second erasing portion). The large diameter portion 10 of the eraser 9 is
It is press-fitted into the large-diameter holding hole 7, and the small-diameter portion 11 is inserted into the small-diameter holding hole 8.

On the other hand, in front of the core tank 2 of the shaft cylinder 1, there is arranged a lead core feeding mechanism 13 which is operated by a pressing operation of the knock piece 12 against the shaft cylinder 1 in the radial direction. In the lead core feeding mechanism 13, the pressing operation of the knock piece 12 causes the chuck body 15 that holds the lead together with the slider 14 to move forward and feed the lead from the tip member 16. It is generally called a side knock type sharp pencil.

Next, an example of use will be described. When the eraser 9 is used from the state shown in FIG. 1, the large diameter portion 10 of the eraser 9 becomes shorter as it is used. Finally, the upper end of the eraser receiving member 3 and the upper surface of the large-diameter portion 10 have the same height, which makes them unusable (see FIG. 2). Here, the eraser 9 is attached to the eraser receiving member 3 by removing it from the eraser receiving member 3, reversing it, and pressing the large diameter portion 10 again into the large diameter holding hole 7 (see FIG. 3). With this, the small diameter portion 11 of the eraser 9 is exposed from the eraser receiving member 3 and can be used.

Since the eraser 9 can be attached to the eraser receiving member 3 in the opposite direction, the eraser 9
The large-diameter portion 10 has a rubber eraser 10a, and the small-diameter portion 11
Can be formed as sand eraser 11a, and they can be appropriately selected and used.

A second example will be described with reference to FIGS. 6 and 7. The difference from the first example is that the holding portion 1 of the eraser receiving member 17 is
8 is the shape of the small-diameter holding hole 19 and the shape of the small-diameter portion 21 of the eraser 20 (the second erasing portion: the first erasing portion is above the small-diameter portion 21). The small-diameter holding hole 19 is formed by a projecting portion 19a and a projecting portion 19b formed at opposing positions. On the other hand, the small diameter portion 21 of the eraser 20
On the outer periphery of the concave portions 21a and 21b, which can be engaged with the protrusions 19a and 19b in the same shape, are formed. Next, the method of use will be described. As in the case of the first example, when the upper portion of the eraser 20 becomes short due to use, the eraser 20 may be once removed from the eraser receiving member 17, the eraser 20 may be reversed, and the eraser receiving member 17 may be attached again. . The large diameter portion of the eraser 20 contacts the tops of the protrusions 19a and 19b, and the small diameter portion 21 is exposed from the eraser receiving member 17.

However, in this example, the eraser 20 can be used without removing it and reversing it (see FIG. 8). More specifically, the shortened eraser 20 is pulled upward in FIG. The protrusions 19a and 19b and the recesses 21a and 2
Pull up until it disengages from 1b. Then, the eraser 20 is rotated in the disengaged state. In this state, the protrusions 19a and 19b and the recesses 21a and 21b have different positional relationships, and even if the eraser 20 is pushed downward, the eraser receiving member 17 does not sink. This is because the lower end of the small diameter portion 21 comes into contact with the protrusions 19a and 19b.

A third example will be described with reference to FIGS. 9 to 12. In this example, in addition to the protrusions 19a and 19b of the second example, protrusions 19c and 19d having different heights (lengths in the longitudinal direction) are also formed. Further, the eraser 20 has a recess 21
In addition to a and 21b, recesses 21c having different (high) heights,
21d is formed. These protrusions and recesses are
Although they fit with each other, the exposed amount of the eraser 20 differs depending on the combination. That is, the exposed amount of the eraser 20 is small in the state where the protrusions 19a and 19b and the recesses 21a and 21b are fitted (see FIG. 9).
If the projection 19d and the recess 21c are fitted together, the amount of exposure increases (see FIG. 10). And then,
When the protrusion and the recess are not fitted at all, the exposure amount becomes the largest (see FIG. 11).

[0012]

The present invention is a pencil having an eraser attached to the rear end of a shaft, wherein the eraser is a first pencil.
Of the erasing part and the second erasing part, and that the first erasing part and the second erasing part have different sectional shapes.
Since the holding portion having the same shape as at least one cross-sectional shape is formed at the rear end of the shaft, the eraser can be easily and safely projected and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first example of the present invention.

FIG. 2 is a longitudinal sectional view of an essential part showing a usage example of FIG.

FIG. 3 is a longitudinal cross-sectional view of a main part showing an example of use of FIG.

FIG. 4 is a longitudinal sectional view of a main part showing another usage example.

FIG. 5 is a longitudinal sectional view of a main part showing another usage example of FIG. 4;

FIG. 6 is a vertical cross-sectional view of a main part showing a second example of the present invention.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a vertical cross-sectional view of a main part showing an example of use of FIG.

FIG. 9 is a longitudinal cross-sectional view of a main part showing a third example of the present invention.

FIG. 10 is a vertical cross-sectional view of an essential part showing the usage example of FIG. 9;

FIG. 11 is a longitudinal cross-sectional view of an essential part showing the usage example of FIG. 9;

12 is a top view of FIG. 9 with the eraser removed.

[Explanation of symbols]

 1 shaft cylinder 2 core tank 3 eraser receiving member 4 clip 5 press fitting part 6 holding part 7 large diameter holding hole 8 small diameter holding hole 9 eraser 10 large diameter part 11 small diameter part 12 knock piece 13 lead core feeding mechanism 14 slider-15 Chuck body 16 Tip member 17 Eraser receiving member 18 Holding portion 19 Small-diameter holding hole 19a Projection 19b Projection 19c Projection 19d Projection 20 Eraser 21 Small diameter 21a Recess 21b Recess 21c Recess 21d Recess X Height

Claims (1)

[Claims] 1. A pencil having an eraser attached to a rear end of a shaft, wherein the eraser is composed of a first erasing portion and a second erasing portion, and the first erasing portion and the second erasing portion. A sharp pencil characterized in that the erasing portion of 2 has a different sectional shape, and at the rear end of the shaft, a holding portion having the same shape as at least one sectional shape is formed.